Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * NSA Security-Enhanced Linux (SELinux) security module |
| 3 | * |
| 4 | * This file contains the SELinux hook function implementations. |
| 5 | * |
| 6 | * Authors: Stephen Smalley, <sds@epoch.ncsc.mil> |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 7 | * Chris Vance, <cvance@nai.com> |
| 8 | * Wayne Salamon, <wsalamon@nai.com> |
| 9 | * James Morris <jmorris@redhat.com> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 10 | * |
| 11 | * Copyright (C) 2001,2002 Networks Associates Technology, Inc. |
Eric Paris | 2069f45 | 2008-07-04 09:47:13 +1000 | [diff] [blame] | 12 | * Copyright (C) 2003-2008 Red Hat, Inc., James Morris <jmorris@redhat.com> |
| 13 | * Eric Paris <eparis@redhat.com> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 14 | * Copyright (C) 2004-2005 Trusted Computer Solutions, Inc. |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 15 | * <dgoeddel@trustedcs.com> |
Paul Moore | ed6d76e | 2009-08-28 18:12:49 -0400 | [diff] [blame] | 16 | * Copyright (C) 2006, 2007, 2009 Hewlett-Packard Development Company, L.P. |
Paul Moore | 82c21bf | 2011-08-01 11:10:33 +0000 | [diff] [blame] | 17 | * Paul Moore <paul@paul-moore.com> |
Yuichi Nakamura | 788e7dd | 2007-09-14 09:27:07 +0900 | [diff] [blame] | 18 | * Copyright (C) 2007 Hitachi Software Engineering Co., Ltd. |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 19 | * Yuichi Nakamura <ynakam@hitachisoft.jp> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | * |
| 21 | * This program is free software; you can redistribute it and/or modify |
| 22 | * it under the terms of the GNU General Public License version 2, |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 23 | * as published by the Free Software Foundation. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | */ |
| 25 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | #include <linux/init.h> |
Eric Paris | 0b24dcb | 2011-02-25 15:39:20 -0500 | [diff] [blame] | 27 | #include <linux/kd.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | #include <linux/kernel.h> |
Roland McGrath | 0d094ef | 2008-07-25 19:45:49 -0700 | [diff] [blame] | 29 | #include <linux/tracehook.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | #include <linux/errno.h> |
| 31 | #include <linux/sched.h> |
Casey Schaufler | 3c4ed7b | 2015-05-02 15:10:46 -0700 | [diff] [blame] | 32 | #include <linux/lsm_hooks.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | #include <linux/xattr.h> |
| 34 | #include <linux/capability.h> |
| 35 | #include <linux/unistd.h> |
| 36 | #include <linux/mm.h> |
| 37 | #include <linux/mman.h> |
| 38 | #include <linux/slab.h> |
| 39 | #include <linux/pagemap.h> |
Eric Paris | 0b24dcb | 2011-02-25 15:39:20 -0500 | [diff] [blame] | 40 | #include <linux/proc_fs.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | #include <linux/swap.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | #include <linux/spinlock.h> |
| 43 | #include <linux/syscalls.h> |
Eric Paris | 2a7dba3 | 2011-02-01 11:05:39 -0500 | [diff] [blame] | 44 | #include <linux/dcache.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | #include <linux/file.h> |
Al Viro | 9f3acc3 | 2008-04-24 07:44:08 -0400 | [diff] [blame] | 46 | #include <linux/fdtable.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | #include <linux/namei.h> |
| 48 | #include <linux/mount.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | #include <linux/netfilter_ipv4.h> |
| 50 | #include <linux/netfilter_ipv6.h> |
| 51 | #include <linux/tty.h> |
| 52 | #include <net/icmp.h> |
Stephen Hemminger | 227b60f | 2007-10-10 17:30:46 -0700 | [diff] [blame] | 53 | #include <net/ip.h> /* for local_port_range[] */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | #include <net/tcp.h> /* struct or_callable used in sock_rcv_skb */ |
Paul Moore | 4718006 | 2013-12-04 16:10:45 -0500 | [diff] [blame] | 55 | #include <net/inet_connection_sock.h> |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 56 | #include <net/net_namespace.h> |
Paul Moore | d621d35 | 2008-01-29 08:43:36 -0500 | [diff] [blame] | 57 | #include <net/netlabel.h> |
Eric Paris | f526971 | 2008-05-14 11:27:45 -0400 | [diff] [blame] | 58 | #include <linux/uaccess.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | #include <asm/ioctls.h> |
Arun Sharma | 60063497 | 2011-07-26 16:09:06 -0700 | [diff] [blame] | 60 | #include <linux/atomic.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | #include <linux/bitops.h> |
| 62 | #include <linux/interrupt.h> |
| 63 | #include <linux/netdevice.h> /* for network interface checks */ |
Hong zhi guo | 7795498 | 2013-03-27 06:49:35 +0000 | [diff] [blame] | 64 | #include <net/netlink.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 65 | #include <linux/tcp.h> |
| 66 | #include <linux/udp.h> |
James Morris | 2ee92d4 | 2006-11-13 16:09:01 -0800 | [diff] [blame] | 67 | #include <linux/dccp.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | #include <linux/quota.h> |
| 69 | #include <linux/un.h> /* for Unix socket types */ |
| 70 | #include <net/af_unix.h> /* for Unix socket types */ |
| 71 | #include <linux/parser.h> |
| 72 | #include <linux/nfs_mount.h> |
| 73 | #include <net/ipv6.h> |
| 74 | #include <linux/hugetlb.h> |
| 75 | #include <linux/personality.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | #include <linux/audit.h> |
Eric Paris | 6931dfc | 2005-06-30 02:58:51 -0700 | [diff] [blame] | 77 | #include <linux/string.h> |
Catherine Zhang | 877ce7c | 2006-06-29 12:27:47 -0700 | [diff] [blame] | 78 | #include <linux/selinux.h> |
Eric Paris | 2397074 | 2006-09-25 23:32:01 -0700 | [diff] [blame] | 79 | #include <linux/mutex.h> |
Frank Mayhar | f06febc | 2008-09-12 09:54:39 -0700 | [diff] [blame] | 80 | #include <linux/posix-timers.h> |
Kees Cook | 0023459 | 2010-02-03 15:36:43 -0800 | [diff] [blame] | 81 | #include <linux/syslog.h> |
Serge E. Hallyn | 3486740 | 2011-03-23 16:43:17 -0700 | [diff] [blame] | 82 | #include <linux/user_namespace.h> |
Paul Gortmaker | 44fc7ea | 2011-05-26 20:52:10 -0400 | [diff] [blame] | 83 | #include <linux/export.h> |
Al Viro | 4040153 | 2012-02-13 03:58:52 +0000 | [diff] [blame] | 84 | #include <linux/msg.h> |
| 85 | #include <linux/shm.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 86 | |
| 87 | #include "avc.h" |
| 88 | #include "objsec.h" |
| 89 | #include "netif.h" |
Paul Moore | 224dfbd | 2008-01-29 08:38:13 -0500 | [diff] [blame] | 90 | #include "netnode.h" |
Paul Moore | 3e11217 | 2008-04-10 10:48:14 -0400 | [diff] [blame] | 91 | #include "netport.h" |
Trent Jaeger | d28d1e0 | 2005-12-13 23:12:40 -0800 | [diff] [blame] | 92 | #include "xfrm.h" |
Paul Moore | c60475b | 2007-02-28 15:14:23 -0500 | [diff] [blame] | 93 | #include "netlabel.h" |
Ahmed S. Darwish | 9d57a7f | 2008-03-01 22:03:14 +0200 | [diff] [blame] | 94 | #include "audit.h" |
James Morris | 7b98a58 | 2011-08-30 12:52:32 +1000 | [diff] [blame] | 95 | #include "avc_ss.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 96 | |
Paul Moore | d621d35 | 2008-01-29 08:43:36 -0500 | [diff] [blame] | 97 | /* SECMARK reference count */ |
James Morris | 56a4ca9 | 2011-08-17 11:08:43 +1000 | [diff] [blame] | 98 | static atomic_t selinux_secmark_refcount = ATOMIC_INIT(0); |
Paul Moore | d621d35 | 2008-01-29 08:43:36 -0500 | [diff] [blame] | 99 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 100 | #ifdef CONFIG_SECURITY_SELINUX_DEVELOP |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 101 | int selinux_enforcing; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | |
| 103 | static int __init enforcing_setup(char *str) |
| 104 | { |
Eric Paris | f526971 | 2008-05-14 11:27:45 -0400 | [diff] [blame] | 105 | unsigned long enforcing; |
Jingoo Han | 29707b2 | 2014-02-05 15:13:14 +0900 | [diff] [blame] | 106 | if (!kstrtoul(str, 0, &enforcing)) |
Eric Paris | f526971 | 2008-05-14 11:27:45 -0400 | [diff] [blame] | 107 | selinux_enforcing = enforcing ? 1 : 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 108 | return 1; |
| 109 | } |
| 110 | __setup("enforcing=", enforcing_setup); |
| 111 | #endif |
| 112 | |
| 113 | #ifdef CONFIG_SECURITY_SELINUX_BOOTPARAM |
| 114 | int selinux_enabled = CONFIG_SECURITY_SELINUX_BOOTPARAM_VALUE; |
| 115 | |
| 116 | static int __init selinux_enabled_setup(char *str) |
| 117 | { |
Eric Paris | f526971 | 2008-05-14 11:27:45 -0400 | [diff] [blame] | 118 | unsigned long enabled; |
Jingoo Han | 29707b2 | 2014-02-05 15:13:14 +0900 | [diff] [blame] | 119 | if (!kstrtoul(str, 0, &enabled)) |
Eric Paris | f526971 | 2008-05-14 11:27:45 -0400 | [diff] [blame] | 120 | selinux_enabled = enabled ? 1 : 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 121 | return 1; |
| 122 | } |
| 123 | __setup("selinux=", selinux_enabled_setup); |
Stephen Smalley | 30d5528 | 2006-05-03 10:52:36 -0400 | [diff] [blame] | 124 | #else |
| 125 | int selinux_enabled = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 126 | #endif |
| 127 | |
Christoph Lameter | e18b890 | 2006-12-06 20:33:20 -0800 | [diff] [blame] | 128 | static struct kmem_cache *sel_inode_cache; |
Sangwoo | 6320565 | 2015-10-21 17:44:30 -0400 | [diff] [blame] | 129 | static struct kmem_cache *file_security_cache; |
James Morris | 7cae7e2 | 2006-03-22 00:09:22 -0800 | [diff] [blame] | 130 | |
Paul Moore | d621d35 | 2008-01-29 08:43:36 -0500 | [diff] [blame] | 131 | /** |
| 132 | * selinux_secmark_enabled - Check to see if SECMARK is currently enabled |
| 133 | * |
| 134 | * Description: |
| 135 | * This function checks the SECMARK reference counter to see if any SECMARK |
| 136 | * targets are currently configured, if the reference counter is greater than |
| 137 | * zero SECMARK is considered to be enabled. Returns true (1) if SECMARK is |
Chris PeBenito | 2be4d74 | 2013-05-03 09:05:39 -0400 | [diff] [blame] | 138 | * enabled, false (0) if SECMARK is disabled. If the always_check_network |
| 139 | * policy capability is enabled, SECMARK is always considered enabled. |
Paul Moore | d621d35 | 2008-01-29 08:43:36 -0500 | [diff] [blame] | 140 | * |
| 141 | */ |
| 142 | static int selinux_secmark_enabled(void) |
| 143 | { |
Chris PeBenito | 2be4d74 | 2013-05-03 09:05:39 -0400 | [diff] [blame] | 144 | return (selinux_policycap_alwaysnetwork || atomic_read(&selinux_secmark_refcount)); |
| 145 | } |
| 146 | |
| 147 | /** |
| 148 | * selinux_peerlbl_enabled - Check to see if peer labeling is currently enabled |
| 149 | * |
| 150 | * Description: |
| 151 | * This function checks if NetLabel or labeled IPSEC is enabled. Returns true |
| 152 | * (1) if any are enabled or false (0) if neither are enabled. If the |
| 153 | * always_check_network policy capability is enabled, peer labeling |
| 154 | * is always considered enabled. |
| 155 | * |
| 156 | */ |
| 157 | static int selinux_peerlbl_enabled(void) |
| 158 | { |
| 159 | return (selinux_policycap_alwaysnetwork || netlbl_enabled() || selinux_xfrm_enabled()); |
Paul Moore | d621d35 | 2008-01-29 08:43:36 -0500 | [diff] [blame] | 160 | } |
| 161 | |
Paul Moore | 615e51f | 2014-06-26 14:33:56 -0400 | [diff] [blame] | 162 | static int selinux_netcache_avc_callback(u32 event) |
| 163 | { |
| 164 | if (event == AVC_CALLBACK_RESET) { |
| 165 | sel_netif_flush(); |
| 166 | sel_netnode_flush(); |
| 167 | sel_netport_flush(); |
| 168 | synchronize_net(); |
| 169 | } |
| 170 | return 0; |
| 171 | } |
| 172 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 173 | /* |
| 174 | * initialise the security for the init task |
| 175 | */ |
| 176 | static void cred_init_security(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 177 | { |
David Howells | 3b11a1d | 2008-11-14 10:39:26 +1100 | [diff] [blame] | 178 | struct cred *cred = (struct cred *) current->real_cred; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 179 | struct task_security_struct *tsec; |
| 180 | |
James Morris | 89d155e | 2005-10-30 14:59:21 -0800 | [diff] [blame] | 181 | tsec = kzalloc(sizeof(struct task_security_struct), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 182 | if (!tsec) |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 183 | panic("SELinux: Failed to initialize initial task.\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 184 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 185 | tsec->osid = tsec->sid = SECINITSID_KERNEL; |
David Howells | f1752ee | 2008-11-14 10:39:17 +1100 | [diff] [blame] | 186 | cred->security = tsec; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 187 | } |
| 188 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 189 | /* |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 190 | * get the security ID of a set of credentials |
| 191 | */ |
| 192 | static inline u32 cred_sid(const struct cred *cred) |
| 193 | { |
| 194 | const struct task_security_struct *tsec; |
| 195 | |
| 196 | tsec = cred->security; |
| 197 | return tsec->sid; |
| 198 | } |
| 199 | |
| 200 | /* |
David Howells | 3b11a1d | 2008-11-14 10:39:26 +1100 | [diff] [blame] | 201 | * get the objective security ID of a task |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 202 | */ |
| 203 | static inline u32 task_sid(const struct task_struct *task) |
| 204 | { |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 205 | u32 sid; |
| 206 | |
| 207 | rcu_read_lock(); |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 208 | sid = cred_sid(__task_cred(task)); |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 209 | rcu_read_unlock(); |
| 210 | return sid; |
| 211 | } |
| 212 | |
| 213 | /* |
David Howells | 3b11a1d | 2008-11-14 10:39:26 +1100 | [diff] [blame] | 214 | * get the subjective security ID of the current task |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 215 | */ |
| 216 | static inline u32 current_sid(void) |
| 217 | { |
Paul Moore | 5fb4987 | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 218 | const struct task_security_struct *tsec = current_security(); |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 219 | |
| 220 | return tsec->sid; |
| 221 | } |
| 222 | |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 223 | /* Allocate and free functions for each kind of security blob. */ |
| 224 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 225 | static int inode_alloc_security(struct inode *inode) |
| 226 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 227 | struct inode_security_struct *isec; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 228 | u32 sid = current_sid(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 229 | |
Josef Bacik | a02fe13 | 2008-04-04 09:35:05 +1100 | [diff] [blame] | 230 | isec = kmem_cache_zalloc(sel_inode_cache, GFP_NOFS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 231 | if (!isec) |
| 232 | return -ENOMEM; |
| 233 | |
Eric Paris | 2397074 | 2006-09-25 23:32:01 -0700 | [diff] [blame] | 234 | mutex_init(&isec->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 235 | INIT_LIST_HEAD(&isec->list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 236 | isec->inode = inode; |
| 237 | isec->sid = SECINITSID_UNLABELED; |
| 238 | isec->sclass = SECCLASS_FILE; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 239 | isec->task_sid = sid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 240 | inode->i_security = isec; |
| 241 | |
| 242 | return 0; |
| 243 | } |
| 244 | |
Andreas Gruenbacher | 5d226df | 2015-12-24 11:09:40 -0500 | [diff] [blame] | 245 | static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dentry); |
| 246 | |
| 247 | /* |
| 248 | * Try reloading inode security labels that have been marked as invalid. The |
| 249 | * @may_sleep parameter indicates when sleeping and thus reloading labels is |
| 250 | * allowed; when set to false, returns ERR_PTR(-ECHILD) when the label is |
| 251 | * invalid. The @opt_dentry parameter should be set to a dentry of the inode; |
| 252 | * when no dentry is available, set it to NULL instead. |
| 253 | */ |
| 254 | static int __inode_security_revalidate(struct inode *inode, |
| 255 | struct dentry *opt_dentry, |
| 256 | bool may_sleep) |
| 257 | { |
| 258 | struct inode_security_struct *isec = inode->i_security; |
| 259 | |
| 260 | might_sleep_if(may_sleep); |
| 261 | |
Paul Moore | 1ac42476 | 2016-04-18 16:41:38 -0400 | [diff] [blame] | 262 | if (ss_initialized && isec->initialized != LABEL_INITIALIZED) { |
Andreas Gruenbacher | 5d226df | 2015-12-24 11:09:40 -0500 | [diff] [blame] | 263 | if (!may_sleep) |
| 264 | return -ECHILD; |
| 265 | |
| 266 | /* |
| 267 | * Try reloading the inode security label. This will fail if |
| 268 | * @opt_dentry is NULL and no dentry for this inode can be |
| 269 | * found; in that case, continue using the old label. |
| 270 | */ |
| 271 | inode_doinit_with_dentry(inode, opt_dentry); |
| 272 | } |
| 273 | return 0; |
| 274 | } |
| 275 | |
Andreas Gruenbacher | 5d226df | 2015-12-24 11:09:40 -0500 | [diff] [blame] | 276 | static struct inode_security_struct *inode_security_novalidate(struct inode *inode) |
| 277 | { |
| 278 | return inode->i_security; |
| 279 | } |
| 280 | |
| 281 | static struct inode_security_struct *inode_security_rcu(struct inode *inode, bool rcu) |
| 282 | { |
| 283 | int error; |
| 284 | |
| 285 | error = __inode_security_revalidate(inode, NULL, !rcu); |
| 286 | if (error) |
| 287 | return ERR_PTR(error); |
| 288 | return inode->i_security; |
| 289 | } |
| 290 | |
Andreas Gruenbacher | 83da53c5 | 2015-12-24 11:09:39 -0500 | [diff] [blame] | 291 | /* |
| 292 | * Get the security label of an inode. |
| 293 | */ |
| 294 | static struct inode_security_struct *inode_security(struct inode *inode) |
| 295 | { |
Andreas Gruenbacher | 5d226df | 2015-12-24 11:09:40 -0500 | [diff] [blame] | 296 | __inode_security_revalidate(inode, NULL, true); |
Andreas Gruenbacher | 83da53c5 | 2015-12-24 11:09:39 -0500 | [diff] [blame] | 297 | return inode->i_security; |
| 298 | } |
| 299 | |
Paul Moore | 2c97165 | 2016-04-19 16:36:28 -0400 | [diff] [blame] | 300 | static struct inode_security_struct *backing_inode_security_novalidate(struct dentry *dentry) |
| 301 | { |
| 302 | struct inode *inode = d_backing_inode(dentry); |
| 303 | |
| 304 | return inode->i_security; |
| 305 | } |
| 306 | |
Andreas Gruenbacher | 83da53c5 | 2015-12-24 11:09:39 -0500 | [diff] [blame] | 307 | /* |
| 308 | * Get the security label of a dentry's backing inode. |
| 309 | */ |
| 310 | static struct inode_security_struct *backing_inode_security(struct dentry *dentry) |
| 311 | { |
| 312 | struct inode *inode = d_backing_inode(dentry); |
| 313 | |
Andreas Gruenbacher | 5d226df | 2015-12-24 11:09:40 -0500 | [diff] [blame] | 314 | __inode_security_revalidate(inode, dentry, true); |
Andreas Gruenbacher | 83da53c5 | 2015-12-24 11:09:39 -0500 | [diff] [blame] | 315 | return inode->i_security; |
| 316 | } |
| 317 | |
Steven Rostedt | 3dc91d4 | 2014-01-09 21:46:34 -0500 | [diff] [blame] | 318 | static void inode_free_rcu(struct rcu_head *head) |
| 319 | { |
| 320 | struct inode_security_struct *isec; |
| 321 | |
| 322 | isec = container_of(head, struct inode_security_struct, rcu); |
| 323 | kmem_cache_free(sel_inode_cache, isec); |
| 324 | } |
| 325 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 326 | static void inode_free_security(struct inode *inode) |
| 327 | { |
| 328 | struct inode_security_struct *isec = inode->i_security; |
| 329 | struct superblock_security_struct *sbsec = inode->i_sb->s_security; |
| 330 | |
Waiman Long | 9629d04 | 2015-07-10 17:19:56 -0400 | [diff] [blame] | 331 | /* |
| 332 | * As not all inode security structures are in a list, we check for |
| 333 | * empty list outside of the lock to make sure that we won't waste |
| 334 | * time taking a lock doing nothing. |
| 335 | * |
| 336 | * The list_del_init() function can be safely called more than once. |
| 337 | * It should not be possible for this function to be called with |
| 338 | * concurrent list_add(), but for better safety against future changes |
| 339 | * in the code, we use list_empty_careful() here. |
| 340 | */ |
| 341 | if (!list_empty_careful(&isec->list)) { |
| 342 | spin_lock(&sbsec->isec_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 343 | list_del_init(&isec->list); |
Waiman Long | 9629d04 | 2015-07-10 17:19:56 -0400 | [diff] [blame] | 344 | spin_unlock(&sbsec->isec_lock); |
| 345 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 346 | |
Steven Rostedt | 3dc91d4 | 2014-01-09 21:46:34 -0500 | [diff] [blame] | 347 | /* |
| 348 | * The inode may still be referenced in a path walk and |
| 349 | * a call to selinux_inode_permission() can be made |
| 350 | * after inode_free_security() is called. Ideally, the VFS |
| 351 | * wouldn't do this, but fixing that is a much harder |
| 352 | * job. For now, simply free the i_security via RCU, and |
| 353 | * leave the current inode->i_security pointer intact. |
| 354 | * The inode will be freed after the RCU grace period too. |
| 355 | */ |
| 356 | call_rcu(&isec->rcu, inode_free_rcu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 357 | } |
| 358 | |
| 359 | static int file_alloc_security(struct file *file) |
| 360 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 361 | struct file_security_struct *fsec; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 362 | u32 sid = current_sid(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 363 | |
Sangwoo | 6320565 | 2015-10-21 17:44:30 -0400 | [diff] [blame] | 364 | fsec = kmem_cache_zalloc(file_security_cache, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 365 | if (!fsec) |
| 366 | return -ENOMEM; |
| 367 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 368 | fsec->sid = sid; |
| 369 | fsec->fown_sid = sid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 370 | file->f_security = fsec; |
| 371 | |
| 372 | return 0; |
| 373 | } |
| 374 | |
| 375 | static void file_free_security(struct file *file) |
| 376 | { |
| 377 | struct file_security_struct *fsec = file->f_security; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 378 | file->f_security = NULL; |
Sangwoo | 6320565 | 2015-10-21 17:44:30 -0400 | [diff] [blame] | 379 | kmem_cache_free(file_security_cache, fsec); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 380 | } |
| 381 | |
| 382 | static int superblock_alloc_security(struct super_block *sb) |
| 383 | { |
| 384 | struct superblock_security_struct *sbsec; |
| 385 | |
James Morris | 89d155e | 2005-10-30 14:59:21 -0800 | [diff] [blame] | 386 | sbsec = kzalloc(sizeof(struct superblock_security_struct), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 387 | if (!sbsec) |
| 388 | return -ENOMEM; |
| 389 | |
Eric Paris | bc7e982 | 2006-09-25 23:32:02 -0700 | [diff] [blame] | 390 | mutex_init(&sbsec->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 391 | INIT_LIST_HEAD(&sbsec->isec_head); |
| 392 | spin_lock_init(&sbsec->isec_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 393 | sbsec->sb = sb; |
| 394 | sbsec->sid = SECINITSID_UNLABELED; |
| 395 | sbsec->def_sid = SECINITSID_FILE; |
Eric Paris | c312feb | 2006-07-10 04:43:53 -0700 | [diff] [blame] | 396 | sbsec->mntpoint_sid = SECINITSID_UNLABELED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 397 | sb->s_security = sbsec; |
| 398 | |
| 399 | return 0; |
| 400 | } |
| 401 | |
| 402 | static void superblock_free_security(struct super_block *sb) |
| 403 | { |
| 404 | struct superblock_security_struct *sbsec = sb->s_security; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 405 | sb->s_security = NULL; |
| 406 | kfree(sbsec); |
| 407 | } |
| 408 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 409 | /* The file system's label must be initialized prior to use. */ |
| 410 | |
David Quigley | eb9ae68 | 2013-05-22 12:50:37 -0400 | [diff] [blame] | 411 | static const char *labeling_behaviors[7] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 412 | "uses xattr", |
| 413 | "uses transition SIDs", |
| 414 | "uses task SIDs", |
| 415 | "uses genfs_contexts", |
| 416 | "not configured for labeling", |
| 417 | "uses mountpoint labeling", |
David Quigley | eb9ae68 | 2013-05-22 12:50:37 -0400 | [diff] [blame] | 418 | "uses native labeling", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 419 | }; |
| 420 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 421 | static inline int inode_doinit(struct inode *inode) |
| 422 | { |
| 423 | return inode_doinit_with_dentry(inode, NULL); |
| 424 | } |
| 425 | |
| 426 | enum { |
Eric Paris | 31e8793 | 2007-09-19 17:19:12 -0400 | [diff] [blame] | 427 | Opt_error = -1, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 428 | Opt_context = 1, |
| 429 | Opt_fscontext = 2, |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 430 | Opt_defcontext = 3, |
| 431 | Opt_rootcontext = 4, |
David P. Quigley | 11689d4 | 2009-01-16 09:22:03 -0500 | [diff] [blame] | 432 | Opt_labelsupport = 5, |
Eric Paris | d355987f | 2012-08-24 15:58:53 -0400 | [diff] [blame] | 433 | Opt_nextmntopt = 6, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 434 | }; |
| 435 | |
Eric Paris | d355987f | 2012-08-24 15:58:53 -0400 | [diff] [blame] | 436 | #define NUM_SEL_MNT_OPTS (Opt_nextmntopt - 1) |
| 437 | |
Steven Whitehouse | a447c09 | 2008-10-13 10:46:57 +0100 | [diff] [blame] | 438 | static const match_table_t tokens = { |
Eric Paris | 832cbd9 | 2008-04-01 13:24:09 -0400 | [diff] [blame] | 439 | {Opt_context, CONTEXT_STR "%s"}, |
| 440 | {Opt_fscontext, FSCONTEXT_STR "%s"}, |
| 441 | {Opt_defcontext, DEFCONTEXT_STR "%s"}, |
| 442 | {Opt_rootcontext, ROOTCONTEXT_STR "%s"}, |
David P. Quigley | 11689d4 | 2009-01-16 09:22:03 -0500 | [diff] [blame] | 443 | {Opt_labelsupport, LABELSUPP_STR}, |
Eric Paris | 31e8793 | 2007-09-19 17:19:12 -0400 | [diff] [blame] | 444 | {Opt_error, NULL}, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 445 | }; |
| 446 | |
| 447 | #define SEL_MOUNT_FAIL_MSG "SELinux: duplicate or incompatible mount options\n" |
| 448 | |
Eric Paris | c312feb | 2006-07-10 04:43:53 -0700 | [diff] [blame] | 449 | static int may_context_mount_sb_relabel(u32 sid, |
| 450 | struct superblock_security_struct *sbsec, |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 451 | const struct cred *cred) |
Eric Paris | c312feb | 2006-07-10 04:43:53 -0700 | [diff] [blame] | 452 | { |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 453 | const struct task_security_struct *tsec = cred->security; |
Eric Paris | c312feb | 2006-07-10 04:43:53 -0700 | [diff] [blame] | 454 | int rc; |
| 455 | |
| 456 | rc = avc_has_perm(tsec->sid, sbsec->sid, SECCLASS_FILESYSTEM, |
| 457 | FILESYSTEM__RELABELFROM, NULL); |
| 458 | if (rc) |
| 459 | return rc; |
| 460 | |
| 461 | rc = avc_has_perm(tsec->sid, sid, SECCLASS_FILESYSTEM, |
| 462 | FILESYSTEM__RELABELTO, NULL); |
| 463 | return rc; |
| 464 | } |
| 465 | |
Eric Paris | 0808925 | 2006-07-10 04:43:55 -0700 | [diff] [blame] | 466 | static int may_context_mount_inode_relabel(u32 sid, |
| 467 | struct superblock_security_struct *sbsec, |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 468 | const struct cred *cred) |
Eric Paris | 0808925 | 2006-07-10 04:43:55 -0700 | [diff] [blame] | 469 | { |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 470 | const struct task_security_struct *tsec = cred->security; |
Eric Paris | 0808925 | 2006-07-10 04:43:55 -0700 | [diff] [blame] | 471 | int rc; |
| 472 | rc = avc_has_perm(tsec->sid, sbsec->sid, SECCLASS_FILESYSTEM, |
| 473 | FILESYSTEM__RELABELFROM, NULL); |
| 474 | if (rc) |
| 475 | return rc; |
| 476 | |
| 477 | rc = avc_has_perm(sid, sbsec->sid, SECCLASS_FILESYSTEM, |
| 478 | FILESYSTEM__ASSOCIATE, NULL); |
| 479 | return rc; |
| 480 | } |
| 481 | |
Eric Paris | b43e725 | 2012-10-10 14:27:35 -0400 | [diff] [blame] | 482 | static int selinux_is_sblabel_mnt(struct super_block *sb) |
| 483 | { |
| 484 | struct superblock_security_struct *sbsec = sb->s_security; |
| 485 | |
Mark Salyzyn | d5f3a5f | 2015-02-04 11:34:30 -0500 | [diff] [blame] | 486 | return sbsec->behavior == SECURITY_FS_USE_XATTR || |
| 487 | sbsec->behavior == SECURITY_FS_USE_TRANS || |
| 488 | sbsec->behavior == SECURITY_FS_USE_TASK || |
J. Bruce Fields | 9fc2b4b | 2015-06-04 15:57:25 -0400 | [diff] [blame] | 489 | sbsec->behavior == SECURITY_FS_USE_NATIVE || |
Mark Salyzyn | d5f3a5f | 2015-02-04 11:34:30 -0500 | [diff] [blame] | 490 | /* Special handling. Genfs but also in-core setxattr handler */ |
| 491 | !strcmp(sb->s_type->name, "sysfs") || |
| 492 | !strcmp(sb->s_type->name, "pstore") || |
| 493 | !strcmp(sb->s_type->name, "debugfs") || |
| 494 | !strcmp(sb->s_type->name, "rootfs"); |
Eric Paris | b43e725 | 2012-10-10 14:27:35 -0400 | [diff] [blame] | 495 | } |
| 496 | |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 497 | static int sb_finish_set_opts(struct super_block *sb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 498 | { |
| 499 | struct superblock_security_struct *sbsec = sb->s_security; |
| 500 | struct dentry *root = sb->s_root; |
David Howells | c6f493d | 2015-03-17 22:26:22 +0000 | [diff] [blame] | 501 | struct inode *root_inode = d_backing_inode(root); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 502 | int rc = 0; |
| 503 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 504 | if (sbsec->behavior == SECURITY_FS_USE_XATTR) { |
| 505 | /* Make sure that the xattr handler exists and that no |
| 506 | error other than -ENODATA is returned by getxattr on |
| 507 | the root directory. -ENODATA is ok, as this may be |
| 508 | the first boot of the SELinux kernel before we have |
| 509 | assigned xattr values to the filesystem. */ |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 510 | if (!root_inode->i_op->getxattr) { |
Linus Torvalds | 29b1deb | 2013-12-15 11:17:45 -0800 | [diff] [blame] | 511 | printk(KERN_WARNING "SELinux: (dev %s, type %s) has no " |
| 512 | "xattr support\n", sb->s_id, sb->s_type->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 513 | rc = -EOPNOTSUPP; |
| 514 | goto out; |
| 515 | } |
Al Viro | ce23e64 | 2016-04-11 00:48:00 -0400 | [diff] [blame] | 516 | rc = root_inode->i_op->getxattr(root, root_inode, |
| 517 | XATTR_NAME_SELINUX, NULL, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 518 | if (rc < 0 && rc != -ENODATA) { |
| 519 | if (rc == -EOPNOTSUPP) |
| 520 | printk(KERN_WARNING "SELinux: (dev %s, type " |
Linus Torvalds | 29b1deb | 2013-12-15 11:17:45 -0800 | [diff] [blame] | 521 | "%s) has no security xattr handler\n", |
| 522 | sb->s_id, sb->s_type->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 523 | else |
| 524 | printk(KERN_WARNING "SELinux: (dev %s, type " |
Linus Torvalds | 29b1deb | 2013-12-15 11:17:45 -0800 | [diff] [blame] | 525 | "%s) getxattr errno %d\n", sb->s_id, |
| 526 | sb->s_type->name, -rc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 527 | goto out; |
| 528 | } |
| 529 | } |
| 530 | |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 531 | if (sbsec->behavior > ARRAY_SIZE(labeling_behaviors)) |
Linus Torvalds | 29b1deb | 2013-12-15 11:17:45 -0800 | [diff] [blame] | 532 | printk(KERN_ERR "SELinux: initialized (dev %s, type %s), unknown behavior\n", |
| 533 | sb->s_id, sb->s_type->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 534 | |
Eric Paris | eadcabc | 2012-08-24 15:59:14 -0400 | [diff] [blame] | 535 | sbsec->flags |= SE_SBINITIALIZED; |
Eric Paris | b43e725 | 2012-10-10 14:27:35 -0400 | [diff] [blame] | 536 | if (selinux_is_sblabel_mnt(sb)) |
Eric Paris | 12f348b | 2012-10-09 10:56:25 -0400 | [diff] [blame] | 537 | sbsec->flags |= SBLABEL_MNT; |
David P. Quigley | ddd29ec | 2009-09-09 14:25:37 -0400 | [diff] [blame] | 538 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 539 | /* Initialize the root inode. */ |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 540 | rc = inode_doinit_with_dentry(root_inode, root); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 541 | |
| 542 | /* Initialize any other inodes associated with the superblock, e.g. |
| 543 | inodes created prior to initial policy load or inodes created |
| 544 | during get_sb by a pseudo filesystem that directly |
| 545 | populates itself. */ |
| 546 | spin_lock(&sbsec->isec_lock); |
| 547 | next_inode: |
| 548 | if (!list_empty(&sbsec->isec_head)) { |
| 549 | struct inode_security_struct *isec = |
| 550 | list_entry(sbsec->isec_head.next, |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 551 | struct inode_security_struct, list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 552 | struct inode *inode = isec->inode; |
Stephen Smalley | 923190d | 2014-10-06 16:32:52 -0400 | [diff] [blame] | 553 | list_del_init(&isec->list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 554 | spin_unlock(&sbsec->isec_lock); |
| 555 | inode = igrab(inode); |
| 556 | if (inode) { |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 557 | if (!IS_PRIVATE(inode)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 558 | inode_doinit(inode); |
| 559 | iput(inode); |
| 560 | } |
| 561 | spin_lock(&sbsec->isec_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 562 | goto next_inode; |
| 563 | } |
| 564 | spin_unlock(&sbsec->isec_lock); |
| 565 | out: |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 566 | return rc; |
| 567 | } |
| 568 | |
| 569 | /* |
| 570 | * This function should allow an FS to ask what it's mount security |
| 571 | * options were so it can use those later for submounts, displaying |
| 572 | * mount options, or whatever. |
| 573 | */ |
| 574 | static int selinux_get_mnt_opts(const struct super_block *sb, |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 575 | struct security_mnt_opts *opts) |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 576 | { |
| 577 | int rc = 0, i; |
| 578 | struct superblock_security_struct *sbsec = sb->s_security; |
| 579 | char *context = NULL; |
| 580 | u32 len; |
| 581 | char tmp; |
| 582 | |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 583 | security_init_mnt_opts(opts); |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 584 | |
David P. Quigley | 0d90a7e | 2009-01-16 09:22:02 -0500 | [diff] [blame] | 585 | if (!(sbsec->flags & SE_SBINITIALIZED)) |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 586 | return -EINVAL; |
| 587 | |
| 588 | if (!ss_initialized) |
| 589 | return -EINVAL; |
| 590 | |
Eric Paris | af8e50c | 2012-08-24 15:59:00 -0400 | [diff] [blame] | 591 | /* make sure we always check enough bits to cover the mask */ |
| 592 | BUILD_BUG_ON(SE_MNTMASK >= (1 << NUM_SEL_MNT_OPTS)); |
| 593 | |
David P. Quigley | 0d90a7e | 2009-01-16 09:22:02 -0500 | [diff] [blame] | 594 | tmp = sbsec->flags & SE_MNTMASK; |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 595 | /* count the number of mount options for this sb */ |
Eric Paris | af8e50c | 2012-08-24 15:59:00 -0400 | [diff] [blame] | 596 | for (i = 0; i < NUM_SEL_MNT_OPTS; i++) { |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 597 | if (tmp & 0x01) |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 598 | opts->num_mnt_opts++; |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 599 | tmp >>= 1; |
| 600 | } |
David P. Quigley | 11689d4 | 2009-01-16 09:22:03 -0500 | [diff] [blame] | 601 | /* Check if the Label support flag is set */ |
Eric Paris | 0b4bdb3 | 2013-08-28 13:32:42 -0400 | [diff] [blame] | 602 | if (sbsec->flags & SBLABEL_MNT) |
David P. Quigley | 11689d4 | 2009-01-16 09:22:03 -0500 | [diff] [blame] | 603 | opts->num_mnt_opts++; |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 604 | |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 605 | opts->mnt_opts = kcalloc(opts->num_mnt_opts, sizeof(char *), GFP_ATOMIC); |
| 606 | if (!opts->mnt_opts) { |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 607 | rc = -ENOMEM; |
| 608 | goto out_free; |
| 609 | } |
| 610 | |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 611 | opts->mnt_opts_flags = kcalloc(opts->num_mnt_opts, sizeof(int), GFP_ATOMIC); |
| 612 | if (!opts->mnt_opts_flags) { |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 613 | rc = -ENOMEM; |
| 614 | goto out_free; |
| 615 | } |
| 616 | |
| 617 | i = 0; |
| 618 | if (sbsec->flags & FSCONTEXT_MNT) { |
| 619 | rc = security_sid_to_context(sbsec->sid, &context, &len); |
| 620 | if (rc) |
| 621 | goto out_free; |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 622 | opts->mnt_opts[i] = context; |
| 623 | opts->mnt_opts_flags[i++] = FSCONTEXT_MNT; |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 624 | } |
| 625 | if (sbsec->flags & CONTEXT_MNT) { |
| 626 | rc = security_sid_to_context(sbsec->mntpoint_sid, &context, &len); |
| 627 | if (rc) |
| 628 | goto out_free; |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 629 | opts->mnt_opts[i] = context; |
| 630 | opts->mnt_opts_flags[i++] = CONTEXT_MNT; |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 631 | } |
| 632 | if (sbsec->flags & DEFCONTEXT_MNT) { |
| 633 | rc = security_sid_to_context(sbsec->def_sid, &context, &len); |
| 634 | if (rc) |
| 635 | goto out_free; |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 636 | opts->mnt_opts[i] = context; |
| 637 | opts->mnt_opts_flags[i++] = DEFCONTEXT_MNT; |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 638 | } |
| 639 | if (sbsec->flags & ROOTCONTEXT_MNT) { |
Andreas Gruenbacher | 83da53c5 | 2015-12-24 11:09:39 -0500 | [diff] [blame] | 640 | struct dentry *root = sbsec->sb->s_root; |
| 641 | struct inode_security_struct *isec = backing_inode_security(root); |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 642 | |
| 643 | rc = security_sid_to_context(isec->sid, &context, &len); |
| 644 | if (rc) |
| 645 | goto out_free; |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 646 | opts->mnt_opts[i] = context; |
| 647 | opts->mnt_opts_flags[i++] = ROOTCONTEXT_MNT; |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 648 | } |
Eric Paris | 12f348b | 2012-10-09 10:56:25 -0400 | [diff] [blame] | 649 | if (sbsec->flags & SBLABEL_MNT) { |
David P. Quigley | 11689d4 | 2009-01-16 09:22:03 -0500 | [diff] [blame] | 650 | opts->mnt_opts[i] = NULL; |
Eric Paris | 12f348b | 2012-10-09 10:56:25 -0400 | [diff] [blame] | 651 | opts->mnt_opts_flags[i++] = SBLABEL_MNT; |
David P. Quigley | 11689d4 | 2009-01-16 09:22:03 -0500 | [diff] [blame] | 652 | } |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 653 | |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 654 | BUG_ON(i != opts->num_mnt_opts); |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 655 | |
| 656 | return 0; |
| 657 | |
| 658 | out_free: |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 659 | security_free_mnt_opts(opts); |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 660 | return rc; |
| 661 | } |
| 662 | |
| 663 | static int bad_option(struct superblock_security_struct *sbsec, char flag, |
| 664 | u32 old_sid, u32 new_sid) |
| 665 | { |
David P. Quigley | 0d90a7e | 2009-01-16 09:22:02 -0500 | [diff] [blame] | 666 | char mnt_flags = sbsec->flags & SE_MNTMASK; |
| 667 | |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 668 | /* check if the old mount command had the same options */ |
David P. Quigley | 0d90a7e | 2009-01-16 09:22:02 -0500 | [diff] [blame] | 669 | if (sbsec->flags & SE_SBINITIALIZED) |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 670 | if (!(sbsec->flags & flag) || |
| 671 | (old_sid != new_sid)) |
| 672 | return 1; |
| 673 | |
| 674 | /* check if we were passed the same options twice, |
| 675 | * aka someone passed context=a,context=b |
| 676 | */ |
David P. Quigley | 0d90a7e | 2009-01-16 09:22:02 -0500 | [diff] [blame] | 677 | if (!(sbsec->flags & SE_SBINITIALIZED)) |
| 678 | if (mnt_flags & flag) |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 679 | return 1; |
| 680 | return 0; |
| 681 | } |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 682 | |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 683 | /* |
| 684 | * Allow filesystems with binary mount data to explicitly set mount point |
| 685 | * labeling information. |
| 686 | */ |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 687 | static int selinux_set_mnt_opts(struct super_block *sb, |
David Quigley | 649f6e7 | 2013-05-22 12:50:36 -0400 | [diff] [blame] | 688 | struct security_mnt_opts *opts, |
| 689 | unsigned long kern_flags, |
| 690 | unsigned long *set_kern_flags) |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 691 | { |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 692 | const struct cred *cred = current_cred(); |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 693 | int rc = 0, i; |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 694 | struct superblock_security_struct *sbsec = sb->s_security; |
Linus Torvalds | 29b1deb | 2013-12-15 11:17:45 -0800 | [diff] [blame] | 695 | const char *name = sb->s_type->name; |
Andreas Gruenbacher | 83da53c5 | 2015-12-24 11:09:39 -0500 | [diff] [blame] | 696 | struct dentry *root = sbsec->sb->s_root; |
Paul Moore | 2c97165 | 2016-04-19 16:36:28 -0400 | [diff] [blame] | 697 | struct inode_security_struct *root_isec; |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 698 | u32 fscontext_sid = 0, context_sid = 0, rootcontext_sid = 0; |
| 699 | u32 defcontext_sid = 0; |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 700 | char **mount_options = opts->mnt_opts; |
| 701 | int *flags = opts->mnt_opts_flags; |
| 702 | int num_opts = opts->num_mnt_opts; |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 703 | |
| 704 | mutex_lock(&sbsec->lock); |
| 705 | |
| 706 | if (!ss_initialized) { |
| 707 | if (!num_opts) { |
| 708 | /* Defer initialization until selinux_complete_init, |
| 709 | after the initial policy is loaded and the security |
| 710 | server is ready to handle calls. */ |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 711 | goto out; |
| 712 | } |
| 713 | rc = -EINVAL; |
Eric Paris | 744ba35 | 2008-04-17 11:52:44 -0400 | [diff] [blame] | 714 | printk(KERN_WARNING "SELinux: Unable to set superblock options " |
| 715 | "before the security server is initialized\n"); |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 716 | goto out; |
| 717 | } |
David Quigley | 649f6e7 | 2013-05-22 12:50:36 -0400 | [diff] [blame] | 718 | if (kern_flags && !set_kern_flags) { |
| 719 | /* Specifying internal flags without providing a place to |
| 720 | * place the results is not allowed */ |
| 721 | rc = -EINVAL; |
| 722 | goto out; |
| 723 | } |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 724 | |
| 725 | /* |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 726 | * Binary mount data FS will come through this function twice. Once |
| 727 | * from an explicit call and once from the generic calls from the vfs. |
| 728 | * Since the generic VFS calls will not contain any security mount data |
| 729 | * we need to skip the double mount verification. |
| 730 | * |
| 731 | * This does open a hole in which we will not notice if the first |
| 732 | * mount using this sb set explict options and a second mount using |
| 733 | * this sb does not set any security options. (The first options |
| 734 | * will be used for both mounts) |
| 735 | */ |
David P. Quigley | 0d90a7e | 2009-01-16 09:22:02 -0500 | [diff] [blame] | 736 | if ((sbsec->flags & SE_SBINITIALIZED) && (sb->s_type->fs_flags & FS_BINARY_MOUNTDATA) |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 737 | && (num_opts == 0)) |
Eric Paris | f526971 | 2008-05-14 11:27:45 -0400 | [diff] [blame] | 738 | goto out; |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 739 | |
Paul Moore | 2c97165 | 2016-04-19 16:36:28 -0400 | [diff] [blame] | 740 | root_isec = backing_inode_security_novalidate(root); |
| 741 | |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 742 | /* |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 743 | * parse the mount options, check if they are valid sids. |
| 744 | * also check if someone is trying to mount the same sb more |
| 745 | * than once with different security options. |
| 746 | */ |
| 747 | for (i = 0; i < num_opts; i++) { |
| 748 | u32 sid; |
David P. Quigley | 11689d4 | 2009-01-16 09:22:03 -0500 | [diff] [blame] | 749 | |
Eric Paris | 12f348b | 2012-10-09 10:56:25 -0400 | [diff] [blame] | 750 | if (flags[i] == SBLABEL_MNT) |
David P. Quigley | 11689d4 | 2009-01-16 09:22:03 -0500 | [diff] [blame] | 751 | continue; |
Rasmus Villemoes | 44be2f6 | 2015-10-21 17:44:25 -0400 | [diff] [blame] | 752 | rc = security_context_str_to_sid(mount_options[i], &sid, GFP_KERNEL); |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 753 | if (rc) { |
Rasmus Villemoes | 44be2f6 | 2015-10-21 17:44:25 -0400 | [diff] [blame] | 754 | printk(KERN_WARNING "SELinux: security_context_str_to_sid" |
Linus Torvalds | 29b1deb | 2013-12-15 11:17:45 -0800 | [diff] [blame] | 755 | "(%s) failed for (dev %s, type %s) errno=%d\n", |
| 756 | mount_options[i], sb->s_id, name, rc); |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 757 | goto out; |
| 758 | } |
| 759 | switch (flags[i]) { |
| 760 | case FSCONTEXT_MNT: |
| 761 | fscontext_sid = sid; |
| 762 | |
| 763 | if (bad_option(sbsec, FSCONTEXT_MNT, sbsec->sid, |
| 764 | fscontext_sid)) |
| 765 | goto out_double_mount; |
| 766 | |
| 767 | sbsec->flags |= FSCONTEXT_MNT; |
| 768 | break; |
| 769 | case CONTEXT_MNT: |
| 770 | context_sid = sid; |
| 771 | |
| 772 | if (bad_option(sbsec, CONTEXT_MNT, sbsec->mntpoint_sid, |
| 773 | context_sid)) |
| 774 | goto out_double_mount; |
| 775 | |
| 776 | sbsec->flags |= CONTEXT_MNT; |
| 777 | break; |
| 778 | case ROOTCONTEXT_MNT: |
| 779 | rootcontext_sid = sid; |
| 780 | |
| 781 | if (bad_option(sbsec, ROOTCONTEXT_MNT, root_isec->sid, |
| 782 | rootcontext_sid)) |
| 783 | goto out_double_mount; |
| 784 | |
| 785 | sbsec->flags |= ROOTCONTEXT_MNT; |
| 786 | |
| 787 | break; |
| 788 | case DEFCONTEXT_MNT: |
| 789 | defcontext_sid = sid; |
| 790 | |
| 791 | if (bad_option(sbsec, DEFCONTEXT_MNT, sbsec->def_sid, |
| 792 | defcontext_sid)) |
| 793 | goto out_double_mount; |
| 794 | |
| 795 | sbsec->flags |= DEFCONTEXT_MNT; |
| 796 | |
| 797 | break; |
| 798 | default: |
| 799 | rc = -EINVAL; |
| 800 | goto out; |
| 801 | } |
| 802 | } |
| 803 | |
David P. Quigley | 0d90a7e | 2009-01-16 09:22:02 -0500 | [diff] [blame] | 804 | if (sbsec->flags & SE_SBINITIALIZED) { |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 805 | /* previously mounted with options, but not on this attempt? */ |
David P. Quigley | 0d90a7e | 2009-01-16 09:22:02 -0500 | [diff] [blame] | 806 | if ((sbsec->flags & SE_MNTMASK) && !num_opts) |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 807 | goto out_double_mount; |
| 808 | rc = 0; |
| 809 | goto out; |
| 810 | } |
| 811 | |
James Morris | 089be43 | 2008-07-15 18:32:49 +1000 | [diff] [blame] | 812 | if (strcmp(sb->s_type->name, "proc") == 0) |
Stephen Smalley | 134509d | 2015-06-04 16:22:17 -0400 | [diff] [blame] | 813 | sbsec->flags |= SE_SBPROC | SE_SBGENFS; |
| 814 | |
Stephen Smalley | 8e01472 | 2015-06-04 16:22:17 -0400 | [diff] [blame] | 815 | if (!strcmp(sb->s_type->name, "debugfs") || |
| 816 | !strcmp(sb->s_type->name, "sysfs") || |
| 817 | !strcmp(sb->s_type->name, "pstore")) |
Stephen Smalley | 134509d | 2015-06-04 16:22:17 -0400 | [diff] [blame] | 818 | sbsec->flags |= SE_SBGENFS; |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 819 | |
David Quigley | eb9ae68 | 2013-05-22 12:50:37 -0400 | [diff] [blame] | 820 | if (!sbsec->behavior) { |
| 821 | /* |
| 822 | * Determine the labeling behavior to use for this |
| 823 | * filesystem type. |
| 824 | */ |
Paul Moore | 98f700f | 2013-09-18 13:52:20 -0400 | [diff] [blame] | 825 | rc = security_fs_use(sb); |
David Quigley | eb9ae68 | 2013-05-22 12:50:37 -0400 | [diff] [blame] | 826 | if (rc) { |
| 827 | printk(KERN_WARNING |
| 828 | "%s: security_fs_use(%s) returned %d\n", |
| 829 | __func__, sb->s_type->name, rc); |
| 830 | goto out; |
| 831 | } |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 832 | } |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 833 | /* sets the context of the superblock for the fs being mounted. */ |
| 834 | if (fscontext_sid) { |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 835 | rc = may_context_mount_sb_relabel(fscontext_sid, sbsec, cred); |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 836 | if (rc) |
| 837 | goto out; |
| 838 | |
| 839 | sbsec->sid = fscontext_sid; |
| 840 | } |
| 841 | |
| 842 | /* |
| 843 | * Switch to using mount point labeling behavior. |
| 844 | * sets the label used on all file below the mountpoint, and will set |
| 845 | * the superblock context if not already set. |
| 846 | */ |
David Quigley | eb9ae68 | 2013-05-22 12:50:37 -0400 | [diff] [blame] | 847 | if (kern_flags & SECURITY_LSM_NATIVE_LABELS && !context_sid) { |
| 848 | sbsec->behavior = SECURITY_FS_USE_NATIVE; |
| 849 | *set_kern_flags |= SECURITY_LSM_NATIVE_LABELS; |
| 850 | } |
| 851 | |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 852 | if (context_sid) { |
| 853 | if (!fscontext_sid) { |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 854 | rc = may_context_mount_sb_relabel(context_sid, sbsec, |
| 855 | cred); |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 856 | if (rc) |
| 857 | goto out; |
| 858 | sbsec->sid = context_sid; |
| 859 | } else { |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 860 | rc = may_context_mount_inode_relabel(context_sid, sbsec, |
| 861 | cred); |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 862 | if (rc) |
| 863 | goto out; |
| 864 | } |
| 865 | if (!rootcontext_sid) |
| 866 | rootcontext_sid = context_sid; |
| 867 | |
| 868 | sbsec->mntpoint_sid = context_sid; |
| 869 | sbsec->behavior = SECURITY_FS_USE_MNTPOINT; |
| 870 | } |
| 871 | |
| 872 | if (rootcontext_sid) { |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 873 | rc = may_context_mount_inode_relabel(rootcontext_sid, sbsec, |
| 874 | cred); |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 875 | if (rc) |
| 876 | goto out; |
| 877 | |
| 878 | root_isec->sid = rootcontext_sid; |
Andreas Gruenbacher | 6f3be9f | 2015-12-24 11:09:40 -0500 | [diff] [blame] | 879 | root_isec->initialized = LABEL_INITIALIZED; |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 880 | } |
| 881 | |
| 882 | if (defcontext_sid) { |
David Quigley | eb9ae68 | 2013-05-22 12:50:37 -0400 | [diff] [blame] | 883 | if (sbsec->behavior != SECURITY_FS_USE_XATTR && |
| 884 | sbsec->behavior != SECURITY_FS_USE_NATIVE) { |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 885 | rc = -EINVAL; |
| 886 | printk(KERN_WARNING "SELinux: defcontext option is " |
| 887 | "invalid for this filesystem type\n"); |
| 888 | goto out; |
| 889 | } |
| 890 | |
| 891 | if (defcontext_sid != sbsec->def_sid) { |
| 892 | rc = may_context_mount_inode_relabel(defcontext_sid, |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 893 | sbsec, cred); |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 894 | if (rc) |
| 895 | goto out; |
| 896 | } |
| 897 | |
| 898 | sbsec->def_sid = defcontext_sid; |
| 899 | } |
| 900 | |
| 901 | rc = sb_finish_set_opts(sb); |
| 902 | out: |
Eric Paris | bc7e982 | 2006-09-25 23:32:02 -0700 | [diff] [blame] | 903 | mutex_unlock(&sbsec->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 904 | return rc; |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 905 | out_double_mount: |
| 906 | rc = -EINVAL; |
| 907 | printk(KERN_WARNING "SELinux: mount invalid. Same superblock, different " |
Linus Torvalds | 29b1deb | 2013-12-15 11:17:45 -0800 | [diff] [blame] | 908 | "security settings for (dev %s, type %s)\n", sb->s_id, name); |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 909 | goto out; |
| 910 | } |
| 911 | |
Jeff Layton | 094f7b6 | 2013-04-01 08:14:24 -0400 | [diff] [blame] | 912 | static int selinux_cmp_sb_context(const struct super_block *oldsb, |
| 913 | const struct super_block *newsb) |
| 914 | { |
| 915 | struct superblock_security_struct *old = oldsb->s_security; |
| 916 | struct superblock_security_struct *new = newsb->s_security; |
| 917 | char oldflags = old->flags & SE_MNTMASK; |
| 918 | char newflags = new->flags & SE_MNTMASK; |
| 919 | |
| 920 | if (oldflags != newflags) |
| 921 | goto mismatch; |
| 922 | if ((oldflags & FSCONTEXT_MNT) && old->sid != new->sid) |
| 923 | goto mismatch; |
| 924 | if ((oldflags & CONTEXT_MNT) && old->mntpoint_sid != new->mntpoint_sid) |
| 925 | goto mismatch; |
| 926 | if ((oldflags & DEFCONTEXT_MNT) && old->def_sid != new->def_sid) |
| 927 | goto mismatch; |
| 928 | if (oldflags & ROOTCONTEXT_MNT) { |
Andreas Gruenbacher | 83da53c5 | 2015-12-24 11:09:39 -0500 | [diff] [blame] | 929 | struct inode_security_struct *oldroot = backing_inode_security(oldsb->s_root); |
| 930 | struct inode_security_struct *newroot = backing_inode_security(newsb->s_root); |
Jeff Layton | 094f7b6 | 2013-04-01 08:14:24 -0400 | [diff] [blame] | 931 | if (oldroot->sid != newroot->sid) |
| 932 | goto mismatch; |
| 933 | } |
| 934 | return 0; |
| 935 | mismatch: |
| 936 | printk(KERN_WARNING "SELinux: mount invalid. Same superblock, " |
| 937 | "different security settings for (dev %s, " |
| 938 | "type %s)\n", newsb->s_id, newsb->s_type->name); |
| 939 | return -EBUSY; |
| 940 | } |
| 941 | |
| 942 | static int selinux_sb_clone_mnt_opts(const struct super_block *oldsb, |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 943 | struct super_block *newsb) |
| 944 | { |
| 945 | const struct superblock_security_struct *oldsbsec = oldsb->s_security; |
| 946 | struct superblock_security_struct *newsbsec = newsb->s_security; |
| 947 | |
| 948 | int set_fscontext = (oldsbsec->flags & FSCONTEXT_MNT); |
| 949 | int set_context = (oldsbsec->flags & CONTEXT_MNT); |
| 950 | int set_rootcontext = (oldsbsec->flags & ROOTCONTEXT_MNT); |
| 951 | |
Eric Paris | 0f5e642 | 2008-04-21 16:24:11 -0400 | [diff] [blame] | 952 | /* |
| 953 | * if the parent was able to be mounted it clearly had no special lsm |
Al Viro | e8c2625 | 2010-03-23 06:36:54 -0400 | [diff] [blame] | 954 | * mount options. thus we can safely deal with this superblock later |
Eric Paris | 0f5e642 | 2008-04-21 16:24:11 -0400 | [diff] [blame] | 955 | */ |
Al Viro | e8c2625 | 2010-03-23 06:36:54 -0400 | [diff] [blame] | 956 | if (!ss_initialized) |
Jeff Layton | 094f7b6 | 2013-04-01 08:14:24 -0400 | [diff] [blame] | 957 | return 0; |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 958 | |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 959 | /* how can we clone if the old one wasn't set up?? */ |
David P. Quigley | 0d90a7e | 2009-01-16 09:22:02 -0500 | [diff] [blame] | 960 | BUG_ON(!(oldsbsec->flags & SE_SBINITIALIZED)); |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 961 | |
Jeff Layton | 094f7b6 | 2013-04-01 08:14:24 -0400 | [diff] [blame] | 962 | /* if fs is reusing a sb, make sure that the contexts match */ |
David P. Quigley | 0d90a7e | 2009-01-16 09:22:02 -0500 | [diff] [blame] | 963 | if (newsbsec->flags & SE_SBINITIALIZED) |
Jeff Layton | 094f7b6 | 2013-04-01 08:14:24 -0400 | [diff] [blame] | 964 | return selinux_cmp_sb_context(oldsb, newsb); |
Eric Paris | 5a55261 | 2008-04-09 14:08:35 -0400 | [diff] [blame] | 965 | |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 966 | mutex_lock(&newsbsec->lock); |
| 967 | |
| 968 | newsbsec->flags = oldsbsec->flags; |
| 969 | |
| 970 | newsbsec->sid = oldsbsec->sid; |
| 971 | newsbsec->def_sid = oldsbsec->def_sid; |
| 972 | newsbsec->behavior = oldsbsec->behavior; |
| 973 | |
| 974 | if (set_context) { |
| 975 | u32 sid = oldsbsec->mntpoint_sid; |
| 976 | |
| 977 | if (!set_fscontext) |
| 978 | newsbsec->sid = sid; |
| 979 | if (!set_rootcontext) { |
Andreas Gruenbacher | 83da53c5 | 2015-12-24 11:09:39 -0500 | [diff] [blame] | 980 | struct inode_security_struct *newisec = backing_inode_security(newsb->s_root); |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 981 | newisec->sid = sid; |
| 982 | } |
| 983 | newsbsec->mntpoint_sid = sid; |
| 984 | } |
| 985 | if (set_rootcontext) { |
Andreas Gruenbacher | 83da53c5 | 2015-12-24 11:09:39 -0500 | [diff] [blame] | 986 | const struct inode_security_struct *oldisec = backing_inode_security(oldsb->s_root); |
| 987 | struct inode_security_struct *newisec = backing_inode_security(newsb->s_root); |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 988 | |
| 989 | newisec->sid = oldisec->sid; |
| 990 | } |
| 991 | |
| 992 | sb_finish_set_opts(newsb); |
| 993 | mutex_unlock(&newsbsec->lock); |
Jeff Layton | 094f7b6 | 2013-04-01 08:14:24 -0400 | [diff] [blame] | 994 | return 0; |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 995 | } |
| 996 | |
Adrian Bunk | 2e1479d | 2008-03-17 22:29:23 +0200 | [diff] [blame] | 997 | static int selinux_parse_opts_str(char *options, |
| 998 | struct security_mnt_opts *opts) |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 999 | { |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 1000 | char *p; |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 1001 | char *context = NULL, *defcontext = NULL; |
| 1002 | char *fscontext = NULL, *rootcontext = NULL; |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 1003 | int rc, num_mnt_opts = 0; |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 1004 | |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 1005 | opts->num_mnt_opts = 0; |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 1006 | |
| 1007 | /* Standard string-based options. */ |
| 1008 | while ((p = strsep(&options, "|")) != NULL) { |
| 1009 | int token; |
| 1010 | substring_t args[MAX_OPT_ARGS]; |
| 1011 | |
| 1012 | if (!*p) |
| 1013 | continue; |
| 1014 | |
| 1015 | token = match_token(p, tokens, args); |
| 1016 | |
| 1017 | switch (token) { |
| 1018 | case Opt_context: |
| 1019 | if (context || defcontext) { |
| 1020 | rc = -EINVAL; |
| 1021 | printk(KERN_WARNING SEL_MOUNT_FAIL_MSG); |
| 1022 | goto out_err; |
| 1023 | } |
| 1024 | context = match_strdup(&args[0]); |
| 1025 | if (!context) { |
| 1026 | rc = -ENOMEM; |
| 1027 | goto out_err; |
| 1028 | } |
| 1029 | break; |
| 1030 | |
| 1031 | case Opt_fscontext: |
| 1032 | if (fscontext) { |
| 1033 | rc = -EINVAL; |
| 1034 | printk(KERN_WARNING SEL_MOUNT_FAIL_MSG); |
| 1035 | goto out_err; |
| 1036 | } |
| 1037 | fscontext = match_strdup(&args[0]); |
| 1038 | if (!fscontext) { |
| 1039 | rc = -ENOMEM; |
| 1040 | goto out_err; |
| 1041 | } |
| 1042 | break; |
| 1043 | |
| 1044 | case Opt_rootcontext: |
| 1045 | if (rootcontext) { |
| 1046 | rc = -EINVAL; |
| 1047 | printk(KERN_WARNING SEL_MOUNT_FAIL_MSG); |
| 1048 | goto out_err; |
| 1049 | } |
| 1050 | rootcontext = match_strdup(&args[0]); |
| 1051 | if (!rootcontext) { |
| 1052 | rc = -ENOMEM; |
| 1053 | goto out_err; |
| 1054 | } |
| 1055 | break; |
| 1056 | |
| 1057 | case Opt_defcontext: |
| 1058 | if (context || defcontext) { |
| 1059 | rc = -EINVAL; |
| 1060 | printk(KERN_WARNING SEL_MOUNT_FAIL_MSG); |
| 1061 | goto out_err; |
| 1062 | } |
| 1063 | defcontext = match_strdup(&args[0]); |
| 1064 | if (!defcontext) { |
| 1065 | rc = -ENOMEM; |
| 1066 | goto out_err; |
| 1067 | } |
| 1068 | break; |
David P. Quigley | 11689d4 | 2009-01-16 09:22:03 -0500 | [diff] [blame] | 1069 | case Opt_labelsupport: |
| 1070 | break; |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 1071 | default: |
| 1072 | rc = -EINVAL; |
| 1073 | printk(KERN_WARNING "SELinux: unknown mount option\n"); |
| 1074 | goto out_err; |
| 1075 | |
| 1076 | } |
| 1077 | } |
| 1078 | |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 1079 | rc = -ENOMEM; |
| 1080 | opts->mnt_opts = kcalloc(NUM_SEL_MNT_OPTS, sizeof(char *), GFP_ATOMIC); |
| 1081 | if (!opts->mnt_opts) |
| 1082 | goto out_err; |
| 1083 | |
| 1084 | opts->mnt_opts_flags = kcalloc(NUM_SEL_MNT_OPTS, sizeof(int), GFP_ATOMIC); |
| 1085 | if (!opts->mnt_opts_flags) { |
| 1086 | kfree(opts->mnt_opts); |
| 1087 | goto out_err; |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 1088 | } |
| 1089 | |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 1090 | if (fscontext) { |
| 1091 | opts->mnt_opts[num_mnt_opts] = fscontext; |
| 1092 | opts->mnt_opts_flags[num_mnt_opts++] = FSCONTEXT_MNT; |
| 1093 | } |
| 1094 | if (context) { |
| 1095 | opts->mnt_opts[num_mnt_opts] = context; |
| 1096 | opts->mnt_opts_flags[num_mnt_opts++] = CONTEXT_MNT; |
| 1097 | } |
| 1098 | if (rootcontext) { |
| 1099 | opts->mnt_opts[num_mnt_opts] = rootcontext; |
| 1100 | opts->mnt_opts_flags[num_mnt_opts++] = ROOTCONTEXT_MNT; |
| 1101 | } |
| 1102 | if (defcontext) { |
| 1103 | opts->mnt_opts[num_mnt_opts] = defcontext; |
| 1104 | opts->mnt_opts_flags[num_mnt_opts++] = DEFCONTEXT_MNT; |
| 1105 | } |
| 1106 | |
| 1107 | opts->num_mnt_opts = num_mnt_opts; |
| 1108 | return 0; |
| 1109 | |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 1110 | out_err: |
| 1111 | kfree(context); |
| 1112 | kfree(defcontext); |
| 1113 | kfree(fscontext); |
| 1114 | kfree(rootcontext); |
| 1115 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1116 | } |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 1117 | /* |
| 1118 | * string mount options parsing and call set the sbsec |
| 1119 | */ |
| 1120 | static int superblock_doinit(struct super_block *sb, void *data) |
| 1121 | { |
| 1122 | int rc = 0; |
| 1123 | char *options = data; |
| 1124 | struct security_mnt_opts opts; |
| 1125 | |
| 1126 | security_init_mnt_opts(&opts); |
| 1127 | |
| 1128 | if (!data) |
| 1129 | goto out; |
| 1130 | |
| 1131 | BUG_ON(sb->s_type->fs_flags & FS_BINARY_MOUNTDATA); |
| 1132 | |
| 1133 | rc = selinux_parse_opts_str(options, &opts); |
| 1134 | if (rc) |
| 1135 | goto out_err; |
| 1136 | |
| 1137 | out: |
David Quigley | 649f6e7 | 2013-05-22 12:50:36 -0400 | [diff] [blame] | 1138 | rc = selinux_set_mnt_opts(sb, &opts, 0, NULL); |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 1139 | |
| 1140 | out_err: |
| 1141 | security_free_mnt_opts(&opts); |
| 1142 | return rc; |
| 1143 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1144 | |
Adrian Bunk | 3583a71 | 2008-07-22 20:21:23 +0300 | [diff] [blame] | 1145 | static void selinux_write_opts(struct seq_file *m, |
| 1146 | struct security_mnt_opts *opts) |
Eric Paris | 2069f45 | 2008-07-04 09:47:13 +1000 | [diff] [blame] | 1147 | { |
| 1148 | int i; |
| 1149 | char *prefix; |
| 1150 | |
| 1151 | for (i = 0; i < opts->num_mnt_opts; i++) { |
David P. Quigley | 11689d4 | 2009-01-16 09:22:03 -0500 | [diff] [blame] | 1152 | char *has_comma; |
| 1153 | |
| 1154 | if (opts->mnt_opts[i]) |
| 1155 | has_comma = strchr(opts->mnt_opts[i], ','); |
| 1156 | else |
| 1157 | has_comma = NULL; |
Eric Paris | 2069f45 | 2008-07-04 09:47:13 +1000 | [diff] [blame] | 1158 | |
| 1159 | switch (opts->mnt_opts_flags[i]) { |
| 1160 | case CONTEXT_MNT: |
| 1161 | prefix = CONTEXT_STR; |
| 1162 | break; |
| 1163 | case FSCONTEXT_MNT: |
| 1164 | prefix = FSCONTEXT_STR; |
| 1165 | break; |
| 1166 | case ROOTCONTEXT_MNT: |
| 1167 | prefix = ROOTCONTEXT_STR; |
| 1168 | break; |
| 1169 | case DEFCONTEXT_MNT: |
| 1170 | prefix = DEFCONTEXT_STR; |
| 1171 | break; |
Eric Paris | 12f348b | 2012-10-09 10:56:25 -0400 | [diff] [blame] | 1172 | case SBLABEL_MNT: |
David P. Quigley | 11689d4 | 2009-01-16 09:22:03 -0500 | [diff] [blame] | 1173 | seq_putc(m, ','); |
| 1174 | seq_puts(m, LABELSUPP_STR); |
| 1175 | continue; |
Eric Paris | 2069f45 | 2008-07-04 09:47:13 +1000 | [diff] [blame] | 1176 | default: |
| 1177 | BUG(); |
Eric Paris | a35c6c8 | 2011-04-20 10:21:28 -0400 | [diff] [blame] | 1178 | return; |
Eric Paris | 2069f45 | 2008-07-04 09:47:13 +1000 | [diff] [blame] | 1179 | }; |
| 1180 | /* we need a comma before each option */ |
| 1181 | seq_putc(m, ','); |
| 1182 | seq_puts(m, prefix); |
| 1183 | if (has_comma) |
| 1184 | seq_putc(m, '\"'); |
Kees Cook | a068acf | 2015-09-04 15:44:57 -0700 | [diff] [blame] | 1185 | seq_escape(m, opts->mnt_opts[i], "\"\n\\"); |
Eric Paris | 2069f45 | 2008-07-04 09:47:13 +1000 | [diff] [blame] | 1186 | if (has_comma) |
| 1187 | seq_putc(m, '\"'); |
| 1188 | } |
| 1189 | } |
| 1190 | |
| 1191 | static int selinux_sb_show_options(struct seq_file *m, struct super_block *sb) |
| 1192 | { |
| 1193 | struct security_mnt_opts opts; |
| 1194 | int rc; |
| 1195 | |
| 1196 | rc = selinux_get_mnt_opts(sb, &opts); |
Eric Paris | 383795c | 2008-07-29 17:07:26 -0400 | [diff] [blame] | 1197 | if (rc) { |
| 1198 | /* before policy load we may get EINVAL, don't show anything */ |
| 1199 | if (rc == -EINVAL) |
| 1200 | rc = 0; |
Eric Paris | 2069f45 | 2008-07-04 09:47:13 +1000 | [diff] [blame] | 1201 | return rc; |
Eric Paris | 383795c | 2008-07-29 17:07:26 -0400 | [diff] [blame] | 1202 | } |
Eric Paris | 2069f45 | 2008-07-04 09:47:13 +1000 | [diff] [blame] | 1203 | |
| 1204 | selinux_write_opts(m, &opts); |
| 1205 | |
| 1206 | security_free_mnt_opts(&opts); |
| 1207 | |
| 1208 | return rc; |
| 1209 | } |
| 1210 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1211 | static inline u16 inode_mode_to_security_class(umode_t mode) |
| 1212 | { |
| 1213 | switch (mode & S_IFMT) { |
| 1214 | case S_IFSOCK: |
| 1215 | return SECCLASS_SOCK_FILE; |
| 1216 | case S_IFLNK: |
| 1217 | return SECCLASS_LNK_FILE; |
| 1218 | case S_IFREG: |
| 1219 | return SECCLASS_FILE; |
| 1220 | case S_IFBLK: |
| 1221 | return SECCLASS_BLK_FILE; |
| 1222 | case S_IFDIR: |
| 1223 | return SECCLASS_DIR; |
| 1224 | case S_IFCHR: |
| 1225 | return SECCLASS_CHR_FILE; |
| 1226 | case S_IFIFO: |
| 1227 | return SECCLASS_FIFO_FILE; |
| 1228 | |
| 1229 | } |
| 1230 | |
| 1231 | return SECCLASS_FILE; |
| 1232 | } |
| 1233 | |
James Morris | 1340258 | 2005-09-30 14:24:34 -0400 | [diff] [blame] | 1234 | static inline int default_protocol_stream(int protocol) |
| 1235 | { |
| 1236 | return (protocol == IPPROTO_IP || protocol == IPPROTO_TCP); |
| 1237 | } |
| 1238 | |
| 1239 | static inline int default_protocol_dgram(int protocol) |
| 1240 | { |
| 1241 | return (protocol == IPPROTO_IP || protocol == IPPROTO_UDP); |
| 1242 | } |
| 1243 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1244 | static inline u16 socket_type_to_security_class(int family, int type, int protocol) |
| 1245 | { |
| 1246 | switch (family) { |
| 1247 | case PF_UNIX: |
| 1248 | switch (type) { |
| 1249 | case SOCK_STREAM: |
| 1250 | case SOCK_SEQPACKET: |
| 1251 | return SECCLASS_UNIX_STREAM_SOCKET; |
| 1252 | case SOCK_DGRAM: |
| 1253 | return SECCLASS_UNIX_DGRAM_SOCKET; |
| 1254 | } |
| 1255 | break; |
| 1256 | case PF_INET: |
| 1257 | case PF_INET6: |
| 1258 | switch (type) { |
| 1259 | case SOCK_STREAM: |
James Morris | 1340258 | 2005-09-30 14:24:34 -0400 | [diff] [blame] | 1260 | if (default_protocol_stream(protocol)) |
| 1261 | return SECCLASS_TCP_SOCKET; |
| 1262 | else |
| 1263 | return SECCLASS_RAWIP_SOCKET; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1264 | case SOCK_DGRAM: |
James Morris | 1340258 | 2005-09-30 14:24:34 -0400 | [diff] [blame] | 1265 | if (default_protocol_dgram(protocol)) |
| 1266 | return SECCLASS_UDP_SOCKET; |
| 1267 | else |
| 1268 | return SECCLASS_RAWIP_SOCKET; |
James Morris | 2ee92d4 | 2006-11-13 16:09:01 -0800 | [diff] [blame] | 1269 | case SOCK_DCCP: |
| 1270 | return SECCLASS_DCCP_SOCKET; |
James Morris | 1340258 | 2005-09-30 14:24:34 -0400 | [diff] [blame] | 1271 | default: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1272 | return SECCLASS_RAWIP_SOCKET; |
| 1273 | } |
| 1274 | break; |
| 1275 | case PF_NETLINK: |
| 1276 | switch (protocol) { |
| 1277 | case NETLINK_ROUTE: |
| 1278 | return SECCLASS_NETLINK_ROUTE_SOCKET; |
Pavel Emelyanov | 7f1fb60 | 2011-12-06 07:56:43 +0000 | [diff] [blame] | 1279 | case NETLINK_SOCK_DIAG: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1280 | return SECCLASS_NETLINK_TCPDIAG_SOCKET; |
| 1281 | case NETLINK_NFLOG: |
| 1282 | return SECCLASS_NETLINK_NFLOG_SOCKET; |
| 1283 | case NETLINK_XFRM: |
| 1284 | return SECCLASS_NETLINK_XFRM_SOCKET; |
| 1285 | case NETLINK_SELINUX: |
| 1286 | return SECCLASS_NETLINK_SELINUX_SOCKET; |
Stephen Smalley | 6c6d2e9 | 2015-06-04 16:22:16 -0400 | [diff] [blame] | 1287 | case NETLINK_ISCSI: |
| 1288 | return SECCLASS_NETLINK_ISCSI_SOCKET; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1289 | case NETLINK_AUDIT: |
| 1290 | return SECCLASS_NETLINK_AUDIT_SOCKET; |
Stephen Smalley | 6c6d2e9 | 2015-06-04 16:22:16 -0400 | [diff] [blame] | 1291 | case NETLINK_FIB_LOOKUP: |
| 1292 | return SECCLASS_NETLINK_FIB_LOOKUP_SOCKET; |
| 1293 | case NETLINK_CONNECTOR: |
| 1294 | return SECCLASS_NETLINK_CONNECTOR_SOCKET; |
| 1295 | case NETLINK_NETFILTER: |
| 1296 | return SECCLASS_NETLINK_NETFILTER_SOCKET; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1297 | case NETLINK_DNRTMSG: |
| 1298 | return SECCLASS_NETLINK_DNRT_SOCKET; |
James Morris | 0c9b794 | 2005-04-16 15:24:13 -0700 | [diff] [blame] | 1299 | case NETLINK_KOBJECT_UEVENT: |
| 1300 | return SECCLASS_NETLINK_KOBJECT_UEVENT_SOCKET; |
Stephen Smalley | 6c6d2e9 | 2015-06-04 16:22:16 -0400 | [diff] [blame] | 1301 | case NETLINK_GENERIC: |
| 1302 | return SECCLASS_NETLINK_GENERIC_SOCKET; |
| 1303 | case NETLINK_SCSITRANSPORT: |
| 1304 | return SECCLASS_NETLINK_SCSITRANSPORT_SOCKET; |
| 1305 | case NETLINK_RDMA: |
| 1306 | return SECCLASS_NETLINK_RDMA_SOCKET; |
| 1307 | case NETLINK_CRYPTO: |
| 1308 | return SECCLASS_NETLINK_CRYPTO_SOCKET; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1309 | default: |
| 1310 | return SECCLASS_NETLINK_SOCKET; |
| 1311 | } |
| 1312 | case PF_PACKET: |
| 1313 | return SECCLASS_PACKET_SOCKET; |
| 1314 | case PF_KEY: |
| 1315 | return SECCLASS_KEY_SOCKET; |
Christopher J. PeBenito | 3e3ff15 | 2006-06-09 00:25:03 -0700 | [diff] [blame] | 1316 | case PF_APPLETALK: |
| 1317 | return SECCLASS_APPLETALK_SOCKET; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1318 | } |
| 1319 | |
| 1320 | return SECCLASS_SOCKET; |
| 1321 | } |
| 1322 | |
Stephen Smalley | 134509d | 2015-06-04 16:22:17 -0400 | [diff] [blame] | 1323 | static int selinux_genfs_get_sid(struct dentry *dentry, |
| 1324 | u16 tclass, |
| 1325 | u16 flags, |
| 1326 | u32 *sid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1327 | { |
Lucian Adrian Grijincu | 8e6c969 | 2011-02-01 18:42:22 +0200 | [diff] [blame] | 1328 | int rc; |
Al Viro | fc64005 | 2016-04-10 01:33:30 -0400 | [diff] [blame] | 1329 | struct super_block *sb = dentry->d_sb; |
Lucian Adrian Grijincu | 8e6c969 | 2011-02-01 18:42:22 +0200 | [diff] [blame] | 1330 | char *buffer, *path; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1331 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 1332 | buffer = (char *)__get_free_page(GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1333 | if (!buffer) |
| 1334 | return -ENOMEM; |
| 1335 | |
Lucian Adrian Grijincu | 8e6c969 | 2011-02-01 18:42:22 +0200 | [diff] [blame] | 1336 | path = dentry_path_raw(dentry, buffer, PAGE_SIZE); |
| 1337 | if (IS_ERR(path)) |
| 1338 | rc = PTR_ERR(path); |
| 1339 | else { |
Stephen Smalley | 134509d | 2015-06-04 16:22:17 -0400 | [diff] [blame] | 1340 | if (flags & SE_SBPROC) { |
| 1341 | /* each process gets a /proc/PID/ entry. Strip off the |
| 1342 | * PID part to get a valid selinux labeling. |
| 1343 | * e.g. /proc/1/net/rpc/nfs -> /net/rpc/nfs */ |
| 1344 | while (path[1] >= '0' && path[1] <= '9') { |
| 1345 | path[1] = '/'; |
| 1346 | path++; |
| 1347 | } |
Lucian Adrian Grijincu | 8e6c969 | 2011-02-01 18:42:22 +0200 | [diff] [blame] | 1348 | } |
Stephen Smalley | 134509d | 2015-06-04 16:22:17 -0400 | [diff] [blame] | 1349 | rc = security_genfs_sid(sb->s_type->name, path, tclass, sid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1350 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1351 | free_page((unsigned long)buffer); |
| 1352 | return rc; |
| 1353 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1354 | |
| 1355 | /* The inode's security attributes must be initialized before first use. */ |
| 1356 | static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dentry) |
| 1357 | { |
| 1358 | struct superblock_security_struct *sbsec = NULL; |
| 1359 | struct inode_security_struct *isec = inode->i_security; |
| 1360 | u32 sid; |
| 1361 | struct dentry *dentry; |
| 1362 | #define INITCONTEXTLEN 255 |
| 1363 | char *context = NULL; |
| 1364 | unsigned len = 0; |
| 1365 | int rc = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1366 | |
Andreas Gruenbacher | 6f3be9f | 2015-12-24 11:09:40 -0500 | [diff] [blame] | 1367 | if (isec->initialized == LABEL_INITIALIZED) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1368 | goto out; |
| 1369 | |
Eric Paris | 2397074 | 2006-09-25 23:32:01 -0700 | [diff] [blame] | 1370 | mutex_lock(&isec->lock); |
Andreas Gruenbacher | 6f3be9f | 2015-12-24 11:09:40 -0500 | [diff] [blame] | 1371 | if (isec->initialized == LABEL_INITIALIZED) |
Eric Paris | 2397074 | 2006-09-25 23:32:01 -0700 | [diff] [blame] | 1372 | goto out_unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1373 | |
| 1374 | sbsec = inode->i_sb->s_security; |
David P. Quigley | 0d90a7e | 2009-01-16 09:22:02 -0500 | [diff] [blame] | 1375 | if (!(sbsec->flags & SE_SBINITIALIZED)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1376 | /* Defer initialization until selinux_complete_init, |
| 1377 | after the initial policy is loaded and the security |
| 1378 | server is ready to handle calls. */ |
| 1379 | spin_lock(&sbsec->isec_lock); |
| 1380 | if (list_empty(&isec->list)) |
| 1381 | list_add(&isec->list, &sbsec->isec_head); |
| 1382 | spin_unlock(&sbsec->isec_lock); |
Eric Paris | 2397074 | 2006-09-25 23:32:01 -0700 | [diff] [blame] | 1383 | goto out_unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1384 | } |
| 1385 | |
| 1386 | switch (sbsec->behavior) { |
David Quigley | eb9ae68 | 2013-05-22 12:50:37 -0400 | [diff] [blame] | 1387 | case SECURITY_FS_USE_NATIVE: |
| 1388 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1389 | case SECURITY_FS_USE_XATTR: |
| 1390 | if (!inode->i_op->getxattr) { |
| 1391 | isec->sid = sbsec->def_sid; |
| 1392 | break; |
| 1393 | } |
| 1394 | |
| 1395 | /* Need a dentry, since the xattr API requires one. |
| 1396 | Life would be simpler if we could just pass the inode. */ |
| 1397 | if (opt_dentry) { |
| 1398 | /* Called from d_instantiate or d_splice_alias. */ |
| 1399 | dentry = dget(opt_dentry); |
| 1400 | } else { |
| 1401 | /* Called from selinux_complete_init, try to find a dentry. */ |
| 1402 | dentry = d_find_alias(inode); |
| 1403 | } |
| 1404 | if (!dentry) { |
Eric Paris | df7f54c | 2009-03-09 14:35:58 -0400 | [diff] [blame] | 1405 | /* |
| 1406 | * this is can be hit on boot when a file is accessed |
| 1407 | * before the policy is loaded. When we load policy we |
| 1408 | * may find inodes that have no dentry on the |
| 1409 | * sbsec->isec_head list. No reason to complain as these |
| 1410 | * will get fixed up the next time we go through |
| 1411 | * inode_doinit with a dentry, before these inodes could |
| 1412 | * be used again by userspace. |
| 1413 | */ |
Eric Paris | 2397074 | 2006-09-25 23:32:01 -0700 | [diff] [blame] | 1414 | goto out_unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1415 | } |
| 1416 | |
| 1417 | len = INITCONTEXTLEN; |
Eric Paris | 4cb912f | 2009-02-12 14:50:05 -0500 | [diff] [blame] | 1418 | context = kmalloc(len+1, GFP_NOFS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1419 | if (!context) { |
| 1420 | rc = -ENOMEM; |
| 1421 | dput(dentry); |
Eric Paris | 2397074 | 2006-09-25 23:32:01 -0700 | [diff] [blame] | 1422 | goto out_unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1423 | } |
Eric Paris | 4cb912f | 2009-02-12 14:50:05 -0500 | [diff] [blame] | 1424 | context[len] = '\0'; |
Al Viro | ce23e64 | 2016-04-11 00:48:00 -0400 | [diff] [blame] | 1425 | rc = inode->i_op->getxattr(dentry, inode, XATTR_NAME_SELINUX, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1426 | context, len); |
| 1427 | if (rc == -ERANGE) { |
James Morris | 314dabb | 2009-08-10 22:00:13 +1000 | [diff] [blame] | 1428 | kfree(context); |
| 1429 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1430 | /* Need a larger buffer. Query for the right size. */ |
Al Viro | ce23e64 | 2016-04-11 00:48:00 -0400 | [diff] [blame] | 1431 | rc = inode->i_op->getxattr(dentry, inode, XATTR_NAME_SELINUX, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1432 | NULL, 0); |
| 1433 | if (rc < 0) { |
| 1434 | dput(dentry); |
Eric Paris | 2397074 | 2006-09-25 23:32:01 -0700 | [diff] [blame] | 1435 | goto out_unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1436 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1437 | len = rc; |
Eric Paris | 4cb912f | 2009-02-12 14:50:05 -0500 | [diff] [blame] | 1438 | context = kmalloc(len+1, GFP_NOFS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1439 | if (!context) { |
| 1440 | rc = -ENOMEM; |
| 1441 | dput(dentry); |
Eric Paris | 2397074 | 2006-09-25 23:32:01 -0700 | [diff] [blame] | 1442 | goto out_unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1443 | } |
Eric Paris | 4cb912f | 2009-02-12 14:50:05 -0500 | [diff] [blame] | 1444 | context[len] = '\0'; |
Al Viro | ce23e64 | 2016-04-11 00:48:00 -0400 | [diff] [blame] | 1445 | rc = inode->i_op->getxattr(dentry, inode, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1446 | XATTR_NAME_SELINUX, |
| 1447 | context, len); |
| 1448 | } |
| 1449 | dput(dentry); |
| 1450 | if (rc < 0) { |
| 1451 | if (rc != -ENODATA) { |
Eric Paris | 744ba35 | 2008-04-17 11:52:44 -0400 | [diff] [blame] | 1452 | printk(KERN_WARNING "SELinux: %s: getxattr returned " |
Harvey Harrison | dd6f953 | 2008-03-06 10:03:59 +1100 | [diff] [blame] | 1453 | "%d for dev=%s ino=%ld\n", __func__, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1454 | -rc, inode->i_sb->s_id, inode->i_ino); |
| 1455 | kfree(context); |
Eric Paris | 2397074 | 2006-09-25 23:32:01 -0700 | [diff] [blame] | 1456 | goto out_unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1457 | } |
| 1458 | /* Map ENODATA to the default file SID */ |
| 1459 | sid = sbsec->def_sid; |
| 1460 | rc = 0; |
| 1461 | } else { |
James Morris | f5c1d5b | 2005-07-28 01:07:37 -0700 | [diff] [blame] | 1462 | rc = security_context_to_sid_default(context, rc, &sid, |
Stephen Smalley | 869ab51 | 2008-04-04 08:46:05 -0400 | [diff] [blame] | 1463 | sbsec->def_sid, |
| 1464 | GFP_NOFS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1465 | if (rc) { |
Eric Paris | 4ba0a8a | 2009-02-12 15:01:10 -0500 | [diff] [blame] | 1466 | char *dev = inode->i_sb->s_id; |
| 1467 | unsigned long ino = inode->i_ino; |
| 1468 | |
| 1469 | if (rc == -EINVAL) { |
| 1470 | if (printk_ratelimit()) |
| 1471 | printk(KERN_NOTICE "SELinux: inode=%lu on dev=%s was found to have an invalid " |
| 1472 | "context=%s. This indicates you may need to relabel the inode or the " |
| 1473 | "filesystem in question.\n", ino, dev, context); |
| 1474 | } else { |
| 1475 | printk(KERN_WARNING "SELinux: %s: context_to_sid(%s) " |
| 1476 | "returned %d for dev=%s ino=%ld\n", |
| 1477 | __func__, context, -rc, dev, ino); |
| 1478 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1479 | kfree(context); |
| 1480 | /* Leave with the unlabeled SID */ |
| 1481 | rc = 0; |
| 1482 | break; |
| 1483 | } |
| 1484 | } |
| 1485 | kfree(context); |
| 1486 | isec->sid = sid; |
| 1487 | break; |
| 1488 | case SECURITY_FS_USE_TASK: |
| 1489 | isec->sid = isec->task_sid; |
| 1490 | break; |
| 1491 | case SECURITY_FS_USE_TRANS: |
| 1492 | /* Default to the fs SID. */ |
| 1493 | isec->sid = sbsec->sid; |
| 1494 | |
| 1495 | /* Try to obtain a transition SID. */ |
| 1496 | isec->sclass = inode_mode_to_security_class(inode->i_mode); |
Eric Paris | 652bb9b | 2011-02-01 11:05:40 -0500 | [diff] [blame] | 1497 | rc = security_transition_sid(isec->task_sid, sbsec->sid, |
| 1498 | isec->sclass, NULL, &sid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1499 | if (rc) |
Eric Paris | 2397074 | 2006-09-25 23:32:01 -0700 | [diff] [blame] | 1500 | goto out_unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1501 | isec->sid = sid; |
| 1502 | break; |
Eric Paris | c312feb | 2006-07-10 04:43:53 -0700 | [diff] [blame] | 1503 | case SECURITY_FS_USE_MNTPOINT: |
| 1504 | isec->sid = sbsec->mntpoint_sid; |
| 1505 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1506 | default: |
Eric Paris | c312feb | 2006-07-10 04:43:53 -0700 | [diff] [blame] | 1507 | /* Default to the fs superblock SID. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1508 | isec->sid = sbsec->sid; |
| 1509 | |
Stephen Smalley | 134509d | 2015-06-04 16:22:17 -0400 | [diff] [blame] | 1510 | if ((sbsec->flags & SE_SBGENFS) && !S_ISLNK(inode->i_mode)) { |
Paul Moore | f64410e | 2014-03-19 16:46:18 -0400 | [diff] [blame] | 1511 | /* We must have a dentry to determine the label on |
| 1512 | * procfs inodes */ |
| 1513 | if (opt_dentry) |
| 1514 | /* Called from d_instantiate or |
| 1515 | * d_splice_alias. */ |
| 1516 | dentry = dget(opt_dentry); |
| 1517 | else |
| 1518 | /* Called from selinux_complete_init, try to |
| 1519 | * find a dentry. */ |
| 1520 | dentry = d_find_alias(inode); |
| 1521 | /* |
| 1522 | * This can be hit on boot when a file is accessed |
| 1523 | * before the policy is loaded. When we load policy we |
| 1524 | * may find inodes that have no dentry on the |
| 1525 | * sbsec->isec_head list. No reason to complain as |
| 1526 | * these will get fixed up the next time we go through |
| 1527 | * inode_doinit() with a dentry, before these inodes |
| 1528 | * could be used again by userspace. |
| 1529 | */ |
| 1530 | if (!dentry) |
| 1531 | goto out_unlock; |
| 1532 | isec->sclass = inode_mode_to_security_class(inode->i_mode); |
Stephen Smalley | 134509d | 2015-06-04 16:22:17 -0400 | [diff] [blame] | 1533 | rc = selinux_genfs_get_sid(dentry, isec->sclass, |
| 1534 | sbsec->flags, &sid); |
Paul Moore | f64410e | 2014-03-19 16:46:18 -0400 | [diff] [blame] | 1535 | dput(dentry); |
| 1536 | if (rc) |
| 1537 | goto out_unlock; |
| 1538 | isec->sid = sid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1539 | } |
| 1540 | break; |
| 1541 | } |
| 1542 | |
Andreas Gruenbacher | 6f3be9f | 2015-12-24 11:09:40 -0500 | [diff] [blame] | 1543 | isec->initialized = LABEL_INITIALIZED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1544 | |
Eric Paris | 2397074 | 2006-09-25 23:32:01 -0700 | [diff] [blame] | 1545 | out_unlock: |
| 1546 | mutex_unlock(&isec->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1547 | out: |
| 1548 | if (isec->sclass == SECCLASS_FILE) |
| 1549 | isec->sclass = inode_mode_to_security_class(inode->i_mode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1550 | return rc; |
| 1551 | } |
| 1552 | |
| 1553 | /* Convert a Linux signal to an access vector. */ |
| 1554 | static inline u32 signal_to_av(int sig) |
| 1555 | { |
| 1556 | u32 perm = 0; |
| 1557 | |
| 1558 | switch (sig) { |
| 1559 | case SIGCHLD: |
| 1560 | /* Commonly granted from child to parent. */ |
| 1561 | perm = PROCESS__SIGCHLD; |
| 1562 | break; |
| 1563 | case SIGKILL: |
| 1564 | /* Cannot be caught or ignored */ |
| 1565 | perm = PROCESS__SIGKILL; |
| 1566 | break; |
| 1567 | case SIGSTOP: |
| 1568 | /* Cannot be caught or ignored */ |
| 1569 | perm = PROCESS__SIGSTOP; |
| 1570 | break; |
| 1571 | default: |
| 1572 | /* All other signals. */ |
| 1573 | perm = PROCESS__SIGNAL; |
| 1574 | break; |
| 1575 | } |
| 1576 | |
| 1577 | return perm; |
| 1578 | } |
| 1579 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1580 | /* |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 1581 | * Check permission between a pair of credentials |
| 1582 | * fork check, ptrace check, etc. |
| 1583 | */ |
| 1584 | static int cred_has_perm(const struct cred *actor, |
| 1585 | const struct cred *target, |
| 1586 | u32 perms) |
| 1587 | { |
| 1588 | u32 asid = cred_sid(actor), tsid = cred_sid(target); |
| 1589 | |
| 1590 | return avc_has_perm(asid, tsid, SECCLASS_PROCESS, perms, NULL); |
| 1591 | } |
| 1592 | |
| 1593 | /* |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 1594 | * Check permission between a pair of tasks, e.g. signal checks, |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1595 | * fork check, ptrace check, etc. |
| 1596 | * tsk1 is the actor and tsk2 is the target |
David Howells | 3b11a1d | 2008-11-14 10:39:26 +1100 | [diff] [blame] | 1597 | * - this uses the default subjective creds of tsk1 |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1598 | */ |
| 1599 | static int task_has_perm(const struct task_struct *tsk1, |
| 1600 | const struct task_struct *tsk2, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1601 | u32 perms) |
| 1602 | { |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1603 | const struct task_security_struct *__tsec1, *__tsec2; |
| 1604 | u32 sid1, sid2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1605 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1606 | rcu_read_lock(); |
| 1607 | __tsec1 = __task_cred(tsk1)->security; sid1 = __tsec1->sid; |
| 1608 | __tsec2 = __task_cred(tsk2)->security; sid2 = __tsec2->sid; |
| 1609 | rcu_read_unlock(); |
| 1610 | return avc_has_perm(sid1, sid2, SECCLASS_PROCESS, perms, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1611 | } |
| 1612 | |
David Howells | 3b11a1d | 2008-11-14 10:39:26 +1100 | [diff] [blame] | 1613 | /* |
| 1614 | * Check permission between current and another task, e.g. signal checks, |
| 1615 | * fork check, ptrace check, etc. |
| 1616 | * current is the actor and tsk2 is the target |
| 1617 | * - this uses current's subjective creds |
| 1618 | */ |
| 1619 | static int current_has_perm(const struct task_struct *tsk, |
| 1620 | u32 perms) |
| 1621 | { |
| 1622 | u32 sid, tsid; |
| 1623 | |
| 1624 | sid = current_sid(); |
| 1625 | tsid = task_sid(tsk); |
| 1626 | return avc_has_perm(sid, tsid, SECCLASS_PROCESS, perms, NULL); |
| 1627 | } |
| 1628 | |
Stephen Smalley | b68e418 | 2008-02-07 11:21:04 -0500 | [diff] [blame] | 1629 | #if CAP_LAST_CAP > 63 |
| 1630 | #error Fix SELinux to handle capabilities > 63. |
| 1631 | #endif |
| 1632 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1633 | /* Check whether a task is allowed to use a capability. */ |
Eric Paris | 6a9de49 | 2012-01-03 12:25:14 -0500 | [diff] [blame] | 1634 | static int cred_has_capability(const struct cred *cred, |
Stephen Smalley | 8e4ff6f | 2016-04-08 13:52:00 -0400 | [diff] [blame] | 1635 | int cap, int audit, bool initns) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1636 | { |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 1637 | struct common_audit_data ad; |
Eric Paris | 0611216 | 2008-11-11 22:02:50 +1100 | [diff] [blame] | 1638 | struct av_decision avd; |
Stephen Smalley | b68e418 | 2008-02-07 11:21:04 -0500 | [diff] [blame] | 1639 | u16 sclass; |
David Howells | 3699c53 | 2009-01-06 22:27:01 +0000 | [diff] [blame] | 1640 | u32 sid = cred_sid(cred); |
Stephen Smalley | b68e418 | 2008-02-07 11:21:04 -0500 | [diff] [blame] | 1641 | u32 av = CAP_TO_MASK(cap); |
Eric Paris | 0611216 | 2008-11-11 22:02:50 +1100 | [diff] [blame] | 1642 | int rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1643 | |
Eric Paris | 50c205f | 2012-04-04 15:01:43 -0400 | [diff] [blame] | 1644 | ad.type = LSM_AUDIT_DATA_CAP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1645 | ad.u.cap = cap; |
| 1646 | |
Stephen Smalley | b68e418 | 2008-02-07 11:21:04 -0500 | [diff] [blame] | 1647 | switch (CAP_TO_INDEX(cap)) { |
| 1648 | case 0: |
Stephen Smalley | 8e4ff6f | 2016-04-08 13:52:00 -0400 | [diff] [blame] | 1649 | sclass = initns ? SECCLASS_CAPABILITY : SECCLASS_CAP_USERNS; |
Stephen Smalley | b68e418 | 2008-02-07 11:21:04 -0500 | [diff] [blame] | 1650 | break; |
| 1651 | case 1: |
Stephen Smalley | 8e4ff6f | 2016-04-08 13:52:00 -0400 | [diff] [blame] | 1652 | sclass = initns ? SECCLASS_CAPABILITY2 : SECCLASS_CAP2_USERNS; |
Stephen Smalley | b68e418 | 2008-02-07 11:21:04 -0500 | [diff] [blame] | 1653 | break; |
| 1654 | default: |
| 1655 | printk(KERN_ERR |
| 1656 | "SELinux: out of range capability %d\n", cap); |
| 1657 | BUG(); |
Eric Paris | a35c6c8 | 2011-04-20 10:21:28 -0400 | [diff] [blame] | 1658 | return -EINVAL; |
Stephen Smalley | b68e418 | 2008-02-07 11:21:04 -0500 | [diff] [blame] | 1659 | } |
Eric Paris | 0611216 | 2008-11-11 22:02:50 +1100 | [diff] [blame] | 1660 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1661 | rc = avc_has_perm_noaudit(sid, sid, sclass, av, 0, &avd); |
Eric Paris | 9ade0cf | 2011-04-25 16:26:29 -0400 | [diff] [blame] | 1662 | if (audit == SECURITY_CAP_AUDIT) { |
NeilBrown | 7b20ea2 | 2015-03-23 13:37:39 +1100 | [diff] [blame] | 1663 | int rc2 = avc_audit(sid, sid, sclass, av, &avd, rc, &ad, 0); |
Eric Paris | 9ade0cf | 2011-04-25 16:26:29 -0400 | [diff] [blame] | 1664 | if (rc2) |
| 1665 | return rc2; |
| 1666 | } |
Eric Paris | 0611216 | 2008-11-11 22:02:50 +1100 | [diff] [blame] | 1667 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1668 | } |
| 1669 | |
| 1670 | /* Check whether a task is allowed to use a system operation. */ |
| 1671 | static int task_has_system(struct task_struct *tsk, |
| 1672 | u32 perms) |
| 1673 | { |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1674 | u32 sid = task_sid(tsk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1675 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1676 | return avc_has_perm(sid, SECINITSID_KERNEL, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1677 | SECCLASS_SYSTEM, perms, NULL); |
| 1678 | } |
| 1679 | |
| 1680 | /* Check whether a task has a particular permission to an inode. |
| 1681 | The 'adp' parameter is optional and allows other audit |
| 1682 | data to be passed (e.g. the dentry). */ |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 1683 | static int inode_has_perm(const struct cred *cred, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1684 | struct inode *inode, |
| 1685 | u32 perms, |
Linus Torvalds | 19e4983 | 2013-10-04 12:54:11 -0700 | [diff] [blame] | 1686 | struct common_audit_data *adp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1687 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1688 | struct inode_security_struct *isec; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1689 | u32 sid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1690 | |
David Howells | e0e8173 | 2009-09-02 09:13:40 +0100 | [diff] [blame] | 1691 | validate_creds(cred); |
| 1692 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 1693 | if (unlikely(IS_PRIVATE(inode))) |
Stephen Smalley | bbaca6c | 2007-02-14 00:34:16 -0800 | [diff] [blame] | 1694 | return 0; |
| 1695 | |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 1696 | sid = cred_sid(cred); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1697 | isec = inode->i_security; |
| 1698 | |
Linus Torvalds | 19e4983 | 2013-10-04 12:54:11 -0700 | [diff] [blame] | 1699 | return avc_has_perm(sid, isec->sid, isec->sclass, perms, adp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1700 | } |
| 1701 | |
| 1702 | /* Same as inode_has_perm, but pass explicit audit data containing |
| 1703 | the dentry to help the auditing code to more easily generate the |
| 1704 | pathname if needed. */ |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 1705 | static inline int dentry_has_perm(const struct cred *cred, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1706 | struct dentry *dentry, |
| 1707 | u32 av) |
| 1708 | { |
David Howells | c6f493d | 2015-03-17 22:26:22 +0000 | [diff] [blame] | 1709 | struct inode *inode = d_backing_inode(dentry); |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 1710 | struct common_audit_data ad; |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 1711 | |
Eric Paris | 50c205f | 2012-04-04 15:01:43 -0400 | [diff] [blame] | 1712 | ad.type = LSM_AUDIT_DATA_DENTRY; |
Eric Paris | 2875fa0 | 2011-04-28 16:04:24 -0400 | [diff] [blame] | 1713 | ad.u.dentry = dentry; |
Andreas Gruenbacher | 5d226df | 2015-12-24 11:09:40 -0500 | [diff] [blame] | 1714 | __inode_security_revalidate(inode, dentry, true); |
Linus Torvalds | 19e4983 | 2013-10-04 12:54:11 -0700 | [diff] [blame] | 1715 | return inode_has_perm(cred, inode, av, &ad); |
Eric Paris | 2875fa0 | 2011-04-28 16:04:24 -0400 | [diff] [blame] | 1716 | } |
| 1717 | |
| 1718 | /* Same as inode_has_perm, but pass explicit audit data containing |
| 1719 | the path to help the auditing code to more easily generate the |
| 1720 | pathname if needed. */ |
| 1721 | static inline int path_has_perm(const struct cred *cred, |
Al Viro | 3f7036a | 2015-03-08 19:28:30 -0400 | [diff] [blame] | 1722 | const struct path *path, |
Eric Paris | 2875fa0 | 2011-04-28 16:04:24 -0400 | [diff] [blame] | 1723 | u32 av) |
| 1724 | { |
David Howells | c6f493d | 2015-03-17 22:26:22 +0000 | [diff] [blame] | 1725 | struct inode *inode = d_backing_inode(path->dentry); |
Eric Paris | 2875fa0 | 2011-04-28 16:04:24 -0400 | [diff] [blame] | 1726 | struct common_audit_data ad; |
| 1727 | |
Eric Paris | 50c205f | 2012-04-04 15:01:43 -0400 | [diff] [blame] | 1728 | ad.type = LSM_AUDIT_DATA_PATH; |
Eric Paris | 2875fa0 | 2011-04-28 16:04:24 -0400 | [diff] [blame] | 1729 | ad.u.path = *path; |
Andreas Gruenbacher | 5d226df | 2015-12-24 11:09:40 -0500 | [diff] [blame] | 1730 | __inode_security_revalidate(inode, path->dentry, true); |
Linus Torvalds | 19e4983 | 2013-10-04 12:54:11 -0700 | [diff] [blame] | 1731 | return inode_has_perm(cred, inode, av, &ad); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1732 | } |
| 1733 | |
David Howells | 13f8e98 | 2013-06-13 23:37:55 +0100 | [diff] [blame] | 1734 | /* Same as path_has_perm, but uses the inode from the file struct. */ |
| 1735 | static inline int file_path_has_perm(const struct cred *cred, |
| 1736 | struct file *file, |
| 1737 | u32 av) |
| 1738 | { |
| 1739 | struct common_audit_data ad; |
| 1740 | |
| 1741 | ad.type = LSM_AUDIT_DATA_PATH; |
| 1742 | ad.u.path = file->f_path; |
Linus Torvalds | 19e4983 | 2013-10-04 12:54:11 -0700 | [diff] [blame] | 1743 | return inode_has_perm(cred, file_inode(file), av, &ad); |
David Howells | 13f8e98 | 2013-06-13 23:37:55 +0100 | [diff] [blame] | 1744 | } |
| 1745 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1746 | /* Check whether a task can use an open file descriptor to |
| 1747 | access an inode in a given way. Check access to the |
| 1748 | descriptor itself, and then use dentry_has_perm to |
| 1749 | check a particular permission to the file. |
| 1750 | Access to the descriptor is implicitly granted if it |
| 1751 | has the same SID as the process. If av is zero, then |
| 1752 | access to the file is not checked, e.g. for cases |
| 1753 | where only the descriptor is affected like seek. */ |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 1754 | static int file_has_perm(const struct cred *cred, |
| 1755 | struct file *file, |
| 1756 | u32 av) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1757 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1758 | struct file_security_struct *fsec = file->f_security; |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 1759 | struct inode *inode = file_inode(file); |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 1760 | struct common_audit_data ad; |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 1761 | u32 sid = cred_sid(cred); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1762 | int rc; |
| 1763 | |
Eric Paris | 50c205f | 2012-04-04 15:01:43 -0400 | [diff] [blame] | 1764 | ad.type = LSM_AUDIT_DATA_PATH; |
Eric Paris | f48b739 | 2011-04-25 12:54:27 -0400 | [diff] [blame] | 1765 | ad.u.path = file->f_path; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1766 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1767 | if (sid != fsec->sid) { |
| 1768 | rc = avc_has_perm(sid, fsec->sid, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1769 | SECCLASS_FD, |
| 1770 | FD__USE, |
| 1771 | &ad); |
| 1772 | if (rc) |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 1773 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1774 | } |
| 1775 | |
| 1776 | /* av is zero if only checking access to the descriptor. */ |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 1777 | rc = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1778 | if (av) |
Linus Torvalds | 19e4983 | 2013-10-04 12:54:11 -0700 | [diff] [blame] | 1779 | rc = inode_has_perm(cred, inode, av, &ad); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1780 | |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 1781 | out: |
| 1782 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1783 | } |
| 1784 | |
David Howells | c3c188b | 2015-07-10 17:19:58 -0400 | [diff] [blame] | 1785 | /* |
| 1786 | * Determine the label for an inode that might be unioned. |
| 1787 | */ |
Andreas Gruenbacher | 83da53c5 | 2015-12-24 11:09:39 -0500 | [diff] [blame] | 1788 | static int selinux_determine_inode_label(struct inode *dir, |
David Howells | c3c188b | 2015-07-10 17:19:58 -0400 | [diff] [blame] | 1789 | const struct qstr *name, |
| 1790 | u16 tclass, |
| 1791 | u32 *_new_isid) |
| 1792 | { |
| 1793 | const struct superblock_security_struct *sbsec = dir->i_sb->s_security; |
David Howells | c3c188b | 2015-07-10 17:19:58 -0400 | [diff] [blame] | 1794 | const struct task_security_struct *tsec = current_security(); |
| 1795 | |
| 1796 | if ((sbsec->flags & SE_SBINITIALIZED) && |
| 1797 | (sbsec->behavior == SECURITY_FS_USE_MNTPOINT)) { |
| 1798 | *_new_isid = sbsec->mntpoint_sid; |
| 1799 | } else if ((sbsec->flags & SBLABEL_MNT) && |
| 1800 | tsec->create_sid) { |
| 1801 | *_new_isid = tsec->create_sid; |
| 1802 | } else { |
Paul Moore | 20cdef8 | 2016-04-04 14:14:42 -0400 | [diff] [blame] | 1803 | const struct inode_security_struct *dsec = inode_security(dir); |
David Howells | c3c188b | 2015-07-10 17:19:58 -0400 | [diff] [blame] | 1804 | return security_transition_sid(tsec->sid, dsec->sid, tclass, |
| 1805 | name, _new_isid); |
| 1806 | } |
| 1807 | |
| 1808 | return 0; |
| 1809 | } |
| 1810 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1811 | /* Check whether a task can create a file. */ |
| 1812 | static int may_create(struct inode *dir, |
| 1813 | struct dentry *dentry, |
| 1814 | u16 tclass) |
| 1815 | { |
Paul Moore | 5fb4987 | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 1816 | const struct task_security_struct *tsec = current_security(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1817 | struct inode_security_struct *dsec; |
| 1818 | struct superblock_security_struct *sbsec; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1819 | u32 sid, newsid; |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 1820 | struct common_audit_data ad; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1821 | int rc; |
| 1822 | |
Andreas Gruenbacher | 83da53c5 | 2015-12-24 11:09:39 -0500 | [diff] [blame] | 1823 | dsec = inode_security(dir); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1824 | sbsec = dir->i_sb->s_security; |
| 1825 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1826 | sid = tsec->sid; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1827 | |
Eric Paris | 50c205f | 2012-04-04 15:01:43 -0400 | [diff] [blame] | 1828 | ad.type = LSM_AUDIT_DATA_DENTRY; |
Eric Paris | a269434 | 2011-04-25 13:10:27 -0400 | [diff] [blame] | 1829 | ad.u.dentry = dentry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1830 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1831 | rc = avc_has_perm(sid, dsec->sid, SECCLASS_DIR, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1832 | DIR__ADD_NAME | DIR__SEARCH, |
| 1833 | &ad); |
| 1834 | if (rc) |
| 1835 | return rc; |
| 1836 | |
David Howells | c3c188b | 2015-07-10 17:19:58 -0400 | [diff] [blame] | 1837 | rc = selinux_determine_inode_label(dir, &dentry->d_name, tclass, |
| 1838 | &newsid); |
| 1839 | if (rc) |
| 1840 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1841 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1842 | rc = avc_has_perm(sid, newsid, tclass, FILE__CREATE, &ad); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1843 | if (rc) |
| 1844 | return rc; |
| 1845 | |
| 1846 | return avc_has_perm(newsid, sbsec->sid, |
| 1847 | SECCLASS_FILESYSTEM, |
| 1848 | FILESYSTEM__ASSOCIATE, &ad); |
| 1849 | } |
| 1850 | |
Michael LeMay | 4eb582c | 2006-06-26 00:24:57 -0700 | [diff] [blame] | 1851 | /* Check whether a task can create a key. */ |
| 1852 | static int may_create_key(u32 ksid, |
| 1853 | struct task_struct *ctx) |
| 1854 | { |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1855 | u32 sid = task_sid(ctx); |
Michael LeMay | 4eb582c | 2006-06-26 00:24:57 -0700 | [diff] [blame] | 1856 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1857 | return avc_has_perm(sid, ksid, SECCLASS_KEY, KEY__CREATE, NULL); |
Michael LeMay | 4eb582c | 2006-06-26 00:24:57 -0700 | [diff] [blame] | 1858 | } |
| 1859 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 1860 | #define MAY_LINK 0 |
| 1861 | #define MAY_UNLINK 1 |
| 1862 | #define MAY_RMDIR 2 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1863 | |
| 1864 | /* Check whether a task can link, unlink, or rmdir a file/directory. */ |
| 1865 | static int may_link(struct inode *dir, |
| 1866 | struct dentry *dentry, |
| 1867 | int kind) |
| 1868 | |
| 1869 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1870 | struct inode_security_struct *dsec, *isec; |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 1871 | struct common_audit_data ad; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1872 | u32 sid = current_sid(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1873 | u32 av; |
| 1874 | int rc; |
| 1875 | |
Andreas Gruenbacher | 83da53c5 | 2015-12-24 11:09:39 -0500 | [diff] [blame] | 1876 | dsec = inode_security(dir); |
| 1877 | isec = backing_inode_security(dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1878 | |
Eric Paris | 50c205f | 2012-04-04 15:01:43 -0400 | [diff] [blame] | 1879 | ad.type = LSM_AUDIT_DATA_DENTRY; |
Eric Paris | a269434 | 2011-04-25 13:10:27 -0400 | [diff] [blame] | 1880 | ad.u.dentry = dentry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1881 | |
| 1882 | av = DIR__SEARCH; |
| 1883 | av |= (kind ? DIR__REMOVE_NAME : DIR__ADD_NAME); |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1884 | rc = avc_has_perm(sid, dsec->sid, SECCLASS_DIR, av, &ad); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1885 | if (rc) |
| 1886 | return rc; |
| 1887 | |
| 1888 | switch (kind) { |
| 1889 | case MAY_LINK: |
| 1890 | av = FILE__LINK; |
| 1891 | break; |
| 1892 | case MAY_UNLINK: |
| 1893 | av = FILE__UNLINK; |
| 1894 | break; |
| 1895 | case MAY_RMDIR: |
| 1896 | av = DIR__RMDIR; |
| 1897 | break; |
| 1898 | default: |
Eric Paris | 744ba35 | 2008-04-17 11:52:44 -0400 | [diff] [blame] | 1899 | printk(KERN_WARNING "SELinux: %s: unrecognized kind %d\n", |
| 1900 | __func__, kind); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1901 | return 0; |
| 1902 | } |
| 1903 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1904 | rc = avc_has_perm(sid, isec->sid, isec->sclass, av, &ad); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1905 | return rc; |
| 1906 | } |
| 1907 | |
| 1908 | static inline int may_rename(struct inode *old_dir, |
| 1909 | struct dentry *old_dentry, |
| 1910 | struct inode *new_dir, |
| 1911 | struct dentry *new_dentry) |
| 1912 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1913 | struct inode_security_struct *old_dsec, *new_dsec, *old_isec, *new_isec; |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 1914 | struct common_audit_data ad; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1915 | u32 sid = current_sid(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1916 | u32 av; |
| 1917 | int old_is_dir, new_is_dir; |
| 1918 | int rc; |
| 1919 | |
Andreas Gruenbacher | 83da53c5 | 2015-12-24 11:09:39 -0500 | [diff] [blame] | 1920 | old_dsec = inode_security(old_dir); |
| 1921 | old_isec = backing_inode_security(old_dentry); |
David Howells | e36cb0b | 2015-01-29 12:02:35 +0000 | [diff] [blame] | 1922 | old_is_dir = d_is_dir(old_dentry); |
Andreas Gruenbacher | 83da53c5 | 2015-12-24 11:09:39 -0500 | [diff] [blame] | 1923 | new_dsec = inode_security(new_dir); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1924 | |
Eric Paris | 50c205f | 2012-04-04 15:01:43 -0400 | [diff] [blame] | 1925 | ad.type = LSM_AUDIT_DATA_DENTRY; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1926 | |
Eric Paris | a269434 | 2011-04-25 13:10:27 -0400 | [diff] [blame] | 1927 | ad.u.dentry = old_dentry; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1928 | rc = avc_has_perm(sid, old_dsec->sid, SECCLASS_DIR, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1929 | DIR__REMOVE_NAME | DIR__SEARCH, &ad); |
| 1930 | if (rc) |
| 1931 | return rc; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1932 | rc = avc_has_perm(sid, old_isec->sid, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1933 | old_isec->sclass, FILE__RENAME, &ad); |
| 1934 | if (rc) |
| 1935 | return rc; |
| 1936 | if (old_is_dir && new_dir != old_dir) { |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1937 | rc = avc_has_perm(sid, old_isec->sid, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1938 | old_isec->sclass, DIR__REPARENT, &ad); |
| 1939 | if (rc) |
| 1940 | return rc; |
| 1941 | } |
| 1942 | |
Eric Paris | a269434 | 2011-04-25 13:10:27 -0400 | [diff] [blame] | 1943 | ad.u.dentry = new_dentry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1944 | av = DIR__ADD_NAME | DIR__SEARCH; |
David Howells | 2c616d4 | 2015-01-29 12:02:33 +0000 | [diff] [blame] | 1945 | if (d_is_positive(new_dentry)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1946 | av |= DIR__REMOVE_NAME; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1947 | rc = avc_has_perm(sid, new_dsec->sid, SECCLASS_DIR, av, &ad); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1948 | if (rc) |
| 1949 | return rc; |
David Howells | 2c616d4 | 2015-01-29 12:02:33 +0000 | [diff] [blame] | 1950 | if (d_is_positive(new_dentry)) { |
Andreas Gruenbacher | 83da53c5 | 2015-12-24 11:09:39 -0500 | [diff] [blame] | 1951 | new_isec = backing_inode_security(new_dentry); |
David Howells | e36cb0b | 2015-01-29 12:02:35 +0000 | [diff] [blame] | 1952 | new_is_dir = d_is_dir(new_dentry); |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1953 | rc = avc_has_perm(sid, new_isec->sid, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1954 | new_isec->sclass, |
| 1955 | (new_is_dir ? DIR__RMDIR : FILE__UNLINK), &ad); |
| 1956 | if (rc) |
| 1957 | return rc; |
| 1958 | } |
| 1959 | |
| 1960 | return 0; |
| 1961 | } |
| 1962 | |
| 1963 | /* Check whether a task can perform a filesystem operation. */ |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 1964 | static int superblock_has_perm(const struct cred *cred, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1965 | struct super_block *sb, |
| 1966 | u32 perms, |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 1967 | struct common_audit_data *ad) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1968 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1969 | struct superblock_security_struct *sbsec; |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 1970 | u32 sid = cred_sid(cred); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1971 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1972 | sbsec = sb->s_security; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1973 | return avc_has_perm(sid, sbsec->sid, SECCLASS_FILESYSTEM, perms, ad); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1974 | } |
| 1975 | |
| 1976 | /* Convert a Linux mode and permission mask to an access vector. */ |
| 1977 | static inline u32 file_mask_to_av(int mode, int mask) |
| 1978 | { |
| 1979 | u32 av = 0; |
| 1980 | |
Al Viro | dba19c6 | 2011-07-25 20:49:29 -0400 | [diff] [blame] | 1981 | if (!S_ISDIR(mode)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1982 | if (mask & MAY_EXEC) |
| 1983 | av |= FILE__EXECUTE; |
| 1984 | if (mask & MAY_READ) |
| 1985 | av |= FILE__READ; |
| 1986 | |
| 1987 | if (mask & MAY_APPEND) |
| 1988 | av |= FILE__APPEND; |
| 1989 | else if (mask & MAY_WRITE) |
| 1990 | av |= FILE__WRITE; |
| 1991 | |
| 1992 | } else { |
| 1993 | if (mask & MAY_EXEC) |
| 1994 | av |= DIR__SEARCH; |
| 1995 | if (mask & MAY_WRITE) |
| 1996 | av |= DIR__WRITE; |
| 1997 | if (mask & MAY_READ) |
| 1998 | av |= DIR__READ; |
| 1999 | } |
| 2000 | |
| 2001 | return av; |
| 2002 | } |
| 2003 | |
| 2004 | /* Convert a Linux file to an access vector. */ |
| 2005 | static inline u32 file_to_av(struct file *file) |
| 2006 | { |
| 2007 | u32 av = 0; |
| 2008 | |
| 2009 | if (file->f_mode & FMODE_READ) |
| 2010 | av |= FILE__READ; |
| 2011 | if (file->f_mode & FMODE_WRITE) { |
| 2012 | if (file->f_flags & O_APPEND) |
| 2013 | av |= FILE__APPEND; |
| 2014 | else |
| 2015 | av |= FILE__WRITE; |
| 2016 | } |
Stephen Smalley | 0794c66 | 2008-03-17 08:55:18 -0400 | [diff] [blame] | 2017 | if (!av) { |
| 2018 | /* |
| 2019 | * Special file opened with flags 3 for ioctl-only use. |
| 2020 | */ |
| 2021 | av = FILE__IOCTL; |
| 2022 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2023 | |
| 2024 | return av; |
| 2025 | } |
| 2026 | |
Eric Paris | 8b6a5a3 | 2008-10-29 17:06:46 -0400 | [diff] [blame] | 2027 | /* |
| 2028 | * Convert a file to an access vector and include the correct open |
| 2029 | * open permission. |
| 2030 | */ |
| 2031 | static inline u32 open_file_to_av(struct file *file) |
| 2032 | { |
| 2033 | u32 av = file_to_av(file); |
| 2034 | |
Eric Paris | 49b7b8d | 2010-07-23 11:44:09 -0400 | [diff] [blame] | 2035 | if (selinux_policycap_openperm) |
| 2036 | av |= FILE__OPEN; |
| 2037 | |
Eric Paris | 8b6a5a3 | 2008-10-29 17:06:46 -0400 | [diff] [blame] | 2038 | return av; |
| 2039 | } |
| 2040 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2041 | /* Hook functions begin here. */ |
| 2042 | |
Stephen Smalley | 79af730 | 2015-01-21 10:54:10 -0500 | [diff] [blame] | 2043 | static int selinux_binder_set_context_mgr(struct task_struct *mgr) |
| 2044 | { |
| 2045 | u32 mysid = current_sid(); |
| 2046 | u32 mgrsid = task_sid(mgr); |
| 2047 | |
| 2048 | return avc_has_perm(mysid, mgrsid, SECCLASS_BINDER, |
| 2049 | BINDER__SET_CONTEXT_MGR, NULL); |
| 2050 | } |
| 2051 | |
| 2052 | static int selinux_binder_transaction(struct task_struct *from, |
| 2053 | struct task_struct *to) |
| 2054 | { |
| 2055 | u32 mysid = current_sid(); |
| 2056 | u32 fromsid = task_sid(from); |
| 2057 | u32 tosid = task_sid(to); |
| 2058 | int rc; |
| 2059 | |
| 2060 | if (mysid != fromsid) { |
| 2061 | rc = avc_has_perm(mysid, fromsid, SECCLASS_BINDER, |
| 2062 | BINDER__IMPERSONATE, NULL); |
| 2063 | if (rc) |
| 2064 | return rc; |
| 2065 | } |
| 2066 | |
| 2067 | return avc_has_perm(fromsid, tosid, SECCLASS_BINDER, BINDER__CALL, |
| 2068 | NULL); |
| 2069 | } |
| 2070 | |
| 2071 | static int selinux_binder_transfer_binder(struct task_struct *from, |
| 2072 | struct task_struct *to) |
| 2073 | { |
| 2074 | u32 fromsid = task_sid(from); |
| 2075 | u32 tosid = task_sid(to); |
| 2076 | |
| 2077 | return avc_has_perm(fromsid, tosid, SECCLASS_BINDER, BINDER__TRANSFER, |
| 2078 | NULL); |
| 2079 | } |
| 2080 | |
| 2081 | static int selinux_binder_transfer_file(struct task_struct *from, |
| 2082 | struct task_struct *to, |
| 2083 | struct file *file) |
| 2084 | { |
| 2085 | u32 sid = task_sid(to); |
| 2086 | struct file_security_struct *fsec = file->f_security; |
Andreas Gruenbacher | 83da53c5 | 2015-12-24 11:09:39 -0500 | [diff] [blame] | 2087 | struct dentry *dentry = file->f_path.dentry; |
Paul Moore | 20cdef8 | 2016-04-04 14:14:42 -0400 | [diff] [blame] | 2088 | struct inode_security_struct *isec; |
Stephen Smalley | 79af730 | 2015-01-21 10:54:10 -0500 | [diff] [blame] | 2089 | struct common_audit_data ad; |
| 2090 | int rc; |
| 2091 | |
| 2092 | ad.type = LSM_AUDIT_DATA_PATH; |
| 2093 | ad.u.path = file->f_path; |
| 2094 | |
| 2095 | if (sid != fsec->sid) { |
| 2096 | rc = avc_has_perm(sid, fsec->sid, |
| 2097 | SECCLASS_FD, |
| 2098 | FD__USE, |
| 2099 | &ad); |
| 2100 | if (rc) |
| 2101 | return rc; |
| 2102 | } |
| 2103 | |
Andreas Gruenbacher | 83da53c5 | 2015-12-24 11:09:39 -0500 | [diff] [blame] | 2104 | if (unlikely(IS_PRIVATE(d_backing_inode(dentry)))) |
Stephen Smalley | 79af730 | 2015-01-21 10:54:10 -0500 | [diff] [blame] | 2105 | return 0; |
| 2106 | |
Paul Moore | 20cdef8 | 2016-04-04 14:14:42 -0400 | [diff] [blame] | 2107 | isec = backing_inode_security(dentry); |
Stephen Smalley | 79af730 | 2015-01-21 10:54:10 -0500 | [diff] [blame] | 2108 | return avc_has_perm(sid, isec->sid, isec->sclass, file_to_av(file), |
| 2109 | &ad); |
| 2110 | } |
| 2111 | |
Ingo Molnar | 9e48858 | 2009-05-07 19:26:19 +1000 | [diff] [blame] | 2112 | static int selinux_ptrace_access_check(struct task_struct *child, |
David Howells | 5cd9c58 | 2008-08-14 11:37:28 +0100 | [diff] [blame] | 2113 | unsigned int mode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2114 | { |
Eric Paris | 69f594a | 2012-01-03 12:25:15 -0500 | [diff] [blame] | 2115 | if (mode & PTRACE_MODE_READ) { |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 2116 | u32 sid = current_sid(); |
| 2117 | u32 csid = task_sid(child); |
| 2118 | return avc_has_perm(sid, csid, SECCLASS_FILE, FILE__READ, NULL); |
Stephen Smalley | 006ebb4 | 2008-05-19 08:32:49 -0400 | [diff] [blame] | 2119 | } |
| 2120 | |
David Howells | 3b11a1d | 2008-11-14 10:39:26 +1100 | [diff] [blame] | 2121 | return current_has_perm(child, PROCESS__PTRACE); |
David Howells | 5cd9c58 | 2008-08-14 11:37:28 +0100 | [diff] [blame] | 2122 | } |
| 2123 | |
| 2124 | static int selinux_ptrace_traceme(struct task_struct *parent) |
| 2125 | { |
David Howells | 5cd9c58 | 2008-08-14 11:37:28 +0100 | [diff] [blame] | 2126 | return task_has_perm(parent, current, PROCESS__PTRACE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2127 | } |
| 2128 | |
| 2129 | static int selinux_capget(struct task_struct *target, kernel_cap_t *effective, |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 2130 | kernel_cap_t *inheritable, kernel_cap_t *permitted) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2131 | { |
Casey Schaufler | b1d9e6b | 2015-05-02 15:11:42 -0700 | [diff] [blame] | 2132 | return current_has_perm(target, PROCESS__GETCAP); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2133 | } |
| 2134 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 2135 | static int selinux_capset(struct cred *new, const struct cred *old, |
| 2136 | const kernel_cap_t *effective, |
| 2137 | const kernel_cap_t *inheritable, |
| 2138 | const kernel_cap_t *permitted) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2139 | { |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 2140 | return cred_has_perm(old, new, PROCESS__SETCAP); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2141 | } |
| 2142 | |
James Morris | 5626d3e | 2009-01-30 10:05:06 +1100 | [diff] [blame] | 2143 | /* |
| 2144 | * (This comment used to live with the selinux_task_setuid hook, |
| 2145 | * which was removed). |
| 2146 | * |
| 2147 | * Since setuid only affects the current process, and since the SELinux |
| 2148 | * controls are not based on the Linux identity attributes, SELinux does not |
| 2149 | * need to control this operation. However, SELinux does control the use of |
| 2150 | * the CAP_SETUID and CAP_SETGID capabilities using the capable hook. |
| 2151 | */ |
| 2152 | |
Eric Paris | 6a9de49 | 2012-01-03 12:25:14 -0500 | [diff] [blame] | 2153 | static int selinux_capable(const struct cred *cred, struct user_namespace *ns, |
| 2154 | int cap, int audit) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2155 | { |
Stephen Smalley | 8e4ff6f | 2016-04-08 13:52:00 -0400 | [diff] [blame] | 2156 | return cred_has_capability(cred, cap, audit, ns == &init_user_ns); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2157 | } |
| 2158 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2159 | static int selinux_quotactl(int cmds, int type, int id, struct super_block *sb) |
| 2160 | { |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 2161 | const struct cred *cred = current_cred(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2162 | int rc = 0; |
| 2163 | |
| 2164 | if (!sb) |
| 2165 | return 0; |
| 2166 | |
| 2167 | switch (cmds) { |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 2168 | case Q_SYNC: |
| 2169 | case Q_QUOTAON: |
| 2170 | case Q_QUOTAOFF: |
| 2171 | case Q_SETINFO: |
| 2172 | case Q_SETQUOTA: |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 2173 | rc = superblock_has_perm(cred, sb, FILESYSTEM__QUOTAMOD, NULL); |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 2174 | break; |
| 2175 | case Q_GETFMT: |
| 2176 | case Q_GETINFO: |
| 2177 | case Q_GETQUOTA: |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 2178 | rc = superblock_has_perm(cred, sb, FILESYSTEM__QUOTAGET, NULL); |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 2179 | break; |
| 2180 | default: |
| 2181 | rc = 0; /* let the kernel handle invalid cmds */ |
| 2182 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2183 | } |
| 2184 | return rc; |
| 2185 | } |
| 2186 | |
| 2187 | static int selinux_quota_on(struct dentry *dentry) |
| 2188 | { |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 2189 | const struct cred *cred = current_cred(); |
| 2190 | |
Eric Paris | 2875fa0 | 2011-04-28 16:04:24 -0400 | [diff] [blame] | 2191 | return dentry_has_perm(cred, dentry, FILE__QUOTAON); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2192 | } |
| 2193 | |
Eric Paris | 12b3052 | 2010-11-15 18:36:29 -0500 | [diff] [blame] | 2194 | static int selinux_syslog(int type) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2195 | { |
| 2196 | int rc; |
| 2197 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2198 | switch (type) { |
Kees Cook | d78ca3c | 2010-02-03 15:37:13 -0800 | [diff] [blame] | 2199 | case SYSLOG_ACTION_READ_ALL: /* Read last kernel messages */ |
| 2200 | case SYSLOG_ACTION_SIZE_BUFFER: /* Return size of the log buffer */ |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 2201 | rc = task_has_system(current, SYSTEM__SYSLOG_READ); |
| 2202 | break; |
Kees Cook | d78ca3c | 2010-02-03 15:37:13 -0800 | [diff] [blame] | 2203 | case SYSLOG_ACTION_CONSOLE_OFF: /* Disable logging to console */ |
| 2204 | case SYSLOG_ACTION_CONSOLE_ON: /* Enable logging to console */ |
| 2205 | /* Set level of messages printed to console */ |
| 2206 | case SYSLOG_ACTION_CONSOLE_LEVEL: |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 2207 | rc = task_has_system(current, SYSTEM__SYSLOG_CONSOLE); |
| 2208 | break; |
Kees Cook | d78ca3c | 2010-02-03 15:37:13 -0800 | [diff] [blame] | 2209 | case SYSLOG_ACTION_CLOSE: /* Close log */ |
| 2210 | case SYSLOG_ACTION_OPEN: /* Open log */ |
| 2211 | case SYSLOG_ACTION_READ: /* Read from log */ |
| 2212 | case SYSLOG_ACTION_READ_CLEAR: /* Read/clear last kernel messages */ |
| 2213 | case SYSLOG_ACTION_CLEAR: /* Clear ring buffer */ |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 2214 | default: |
| 2215 | rc = task_has_system(current, SYSTEM__SYSLOG_MOD); |
| 2216 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2217 | } |
| 2218 | return rc; |
| 2219 | } |
| 2220 | |
| 2221 | /* |
| 2222 | * Check that a process has enough memory to allocate a new virtual |
| 2223 | * mapping. 0 means there is enough memory for the allocation to |
| 2224 | * succeed and -ENOMEM implies there is not. |
| 2225 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2226 | * Do not audit the selinux permission check, as this is applied to all |
| 2227 | * processes that allocate mappings. |
| 2228 | */ |
Alan Cox | 34b4e4a | 2007-08-22 14:01:28 -0700 | [diff] [blame] | 2229 | static int selinux_vm_enough_memory(struct mm_struct *mm, long pages) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2230 | { |
| 2231 | int rc, cap_sys_admin = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2232 | |
Casey Schaufler | b1d9e6b | 2015-05-02 15:11:42 -0700 | [diff] [blame] | 2233 | rc = cred_has_capability(current_cred(), CAP_SYS_ADMIN, |
Stephen Smalley | 8e4ff6f | 2016-04-08 13:52:00 -0400 | [diff] [blame] | 2234 | SECURITY_CAP_NOAUDIT, true); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2235 | if (rc == 0) |
| 2236 | cap_sys_admin = 1; |
| 2237 | |
Casey Schaufler | b1d9e6b | 2015-05-02 15:11:42 -0700 | [diff] [blame] | 2238 | return cap_sys_admin; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2239 | } |
| 2240 | |
| 2241 | /* binprm security operations */ |
| 2242 | |
Paul Moore | 0c6181c | 2016-03-30 21:41:21 -0400 | [diff] [blame] | 2243 | static u32 ptrace_parent_sid(struct task_struct *task) |
| 2244 | { |
| 2245 | u32 sid = 0; |
| 2246 | struct task_struct *tracer; |
| 2247 | |
| 2248 | rcu_read_lock(); |
| 2249 | tracer = ptrace_parent(task); |
| 2250 | if (tracer) |
| 2251 | sid = task_sid(tracer); |
| 2252 | rcu_read_unlock(); |
| 2253 | |
| 2254 | return sid; |
| 2255 | } |
| 2256 | |
Stephen Smalley | 7b0d0b4 | 2014-08-04 13:36:49 -0400 | [diff] [blame] | 2257 | static int check_nnp_nosuid(const struct linux_binprm *bprm, |
| 2258 | const struct task_security_struct *old_tsec, |
| 2259 | const struct task_security_struct *new_tsec) |
| 2260 | { |
| 2261 | int nnp = (bprm->unsafe & LSM_UNSAFE_NO_NEW_PRIVS); |
| 2262 | int nosuid = (bprm->file->f_path.mnt->mnt_flags & MNT_NOSUID); |
| 2263 | int rc; |
| 2264 | |
| 2265 | if (!nnp && !nosuid) |
| 2266 | return 0; /* neither NNP nor nosuid */ |
| 2267 | |
| 2268 | if (new_tsec->sid == old_tsec->sid) |
| 2269 | return 0; /* No change in credentials */ |
| 2270 | |
| 2271 | /* |
| 2272 | * The only transitions we permit under NNP or nosuid |
| 2273 | * are transitions to bounded SIDs, i.e. SIDs that are |
| 2274 | * guaranteed to only be allowed a subset of the permissions |
| 2275 | * of the current SID. |
| 2276 | */ |
| 2277 | rc = security_bounded_transition(old_tsec->sid, new_tsec->sid); |
| 2278 | if (rc) { |
| 2279 | /* |
| 2280 | * On failure, preserve the errno values for NNP vs nosuid. |
| 2281 | * NNP: Operation not permitted for caller. |
| 2282 | * nosuid: Permission denied to file. |
| 2283 | */ |
| 2284 | if (nnp) |
| 2285 | return -EPERM; |
| 2286 | else |
| 2287 | return -EACCES; |
| 2288 | } |
| 2289 | return 0; |
| 2290 | } |
| 2291 | |
David Howells | a6f76f2 | 2008-11-14 10:39:24 +1100 | [diff] [blame] | 2292 | static int selinux_bprm_set_creds(struct linux_binprm *bprm) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2293 | { |
David Howells | a6f76f2 | 2008-11-14 10:39:24 +1100 | [diff] [blame] | 2294 | const struct task_security_struct *old_tsec; |
| 2295 | struct task_security_struct *new_tsec; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2296 | struct inode_security_struct *isec; |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 2297 | struct common_audit_data ad; |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 2298 | struct inode *inode = file_inode(bprm->file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2299 | int rc; |
| 2300 | |
David Howells | a6f76f2 | 2008-11-14 10:39:24 +1100 | [diff] [blame] | 2301 | /* SELinux context only depends on initial program or script and not |
| 2302 | * the script interpreter */ |
| 2303 | if (bprm->cred_prepared) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2304 | return 0; |
| 2305 | |
David Howells | a6f76f2 | 2008-11-14 10:39:24 +1100 | [diff] [blame] | 2306 | old_tsec = current_security(); |
| 2307 | new_tsec = bprm->cred->security; |
Andreas Gruenbacher | 83da53c5 | 2015-12-24 11:09:39 -0500 | [diff] [blame] | 2308 | isec = inode_security(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2309 | |
| 2310 | /* Default to the current task SID. */ |
David Howells | a6f76f2 | 2008-11-14 10:39:24 +1100 | [diff] [blame] | 2311 | new_tsec->sid = old_tsec->sid; |
| 2312 | new_tsec->osid = old_tsec->sid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2313 | |
Michael LeMay | 28eba5b | 2006-06-27 02:53:42 -0700 | [diff] [blame] | 2314 | /* Reset fs, key, and sock SIDs on execve. */ |
David Howells | a6f76f2 | 2008-11-14 10:39:24 +1100 | [diff] [blame] | 2315 | new_tsec->create_sid = 0; |
| 2316 | new_tsec->keycreate_sid = 0; |
| 2317 | new_tsec->sockcreate_sid = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2318 | |
David Howells | a6f76f2 | 2008-11-14 10:39:24 +1100 | [diff] [blame] | 2319 | if (old_tsec->exec_sid) { |
| 2320 | new_tsec->sid = old_tsec->exec_sid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2321 | /* Reset exec SID on execve. */ |
David Howells | a6f76f2 | 2008-11-14 10:39:24 +1100 | [diff] [blame] | 2322 | new_tsec->exec_sid = 0; |
Andy Lutomirski | 259e5e6 | 2012-04-12 16:47:50 -0500 | [diff] [blame] | 2323 | |
Stephen Smalley | 7b0d0b4 | 2014-08-04 13:36:49 -0400 | [diff] [blame] | 2324 | /* Fail on NNP or nosuid if not an allowed transition. */ |
| 2325 | rc = check_nnp_nosuid(bprm, old_tsec, new_tsec); |
| 2326 | if (rc) |
| 2327 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2328 | } else { |
| 2329 | /* Check for a default transition on this program. */ |
David Howells | a6f76f2 | 2008-11-14 10:39:24 +1100 | [diff] [blame] | 2330 | rc = security_transition_sid(old_tsec->sid, isec->sid, |
Eric Paris | 652bb9b | 2011-02-01 11:05:40 -0500 | [diff] [blame] | 2331 | SECCLASS_PROCESS, NULL, |
| 2332 | &new_tsec->sid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2333 | if (rc) |
| 2334 | return rc; |
Stephen Smalley | 7b0d0b4 | 2014-08-04 13:36:49 -0400 | [diff] [blame] | 2335 | |
| 2336 | /* |
| 2337 | * Fallback to old SID on NNP or nosuid if not an allowed |
| 2338 | * transition. |
| 2339 | */ |
| 2340 | rc = check_nnp_nosuid(bprm, old_tsec, new_tsec); |
| 2341 | if (rc) |
| 2342 | new_tsec->sid = old_tsec->sid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2343 | } |
| 2344 | |
Eric Paris | 50c205f | 2012-04-04 15:01:43 -0400 | [diff] [blame] | 2345 | ad.type = LSM_AUDIT_DATA_PATH; |
Eric Paris | f48b739 | 2011-04-25 12:54:27 -0400 | [diff] [blame] | 2346 | ad.u.path = bprm->file->f_path; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2347 | |
David Howells | a6f76f2 | 2008-11-14 10:39:24 +1100 | [diff] [blame] | 2348 | if (new_tsec->sid == old_tsec->sid) { |
| 2349 | rc = avc_has_perm(old_tsec->sid, isec->sid, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2350 | SECCLASS_FILE, FILE__EXECUTE_NO_TRANS, &ad); |
| 2351 | if (rc) |
| 2352 | return rc; |
| 2353 | } else { |
| 2354 | /* Check permissions for the transition. */ |
David Howells | a6f76f2 | 2008-11-14 10:39:24 +1100 | [diff] [blame] | 2355 | rc = avc_has_perm(old_tsec->sid, new_tsec->sid, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2356 | SECCLASS_PROCESS, PROCESS__TRANSITION, &ad); |
| 2357 | if (rc) |
| 2358 | return rc; |
| 2359 | |
David Howells | a6f76f2 | 2008-11-14 10:39:24 +1100 | [diff] [blame] | 2360 | rc = avc_has_perm(new_tsec->sid, isec->sid, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2361 | SECCLASS_FILE, FILE__ENTRYPOINT, &ad); |
| 2362 | if (rc) |
| 2363 | return rc; |
| 2364 | |
David Howells | a6f76f2 | 2008-11-14 10:39:24 +1100 | [diff] [blame] | 2365 | /* Check for shared state */ |
| 2366 | if (bprm->unsafe & LSM_UNSAFE_SHARE) { |
| 2367 | rc = avc_has_perm(old_tsec->sid, new_tsec->sid, |
| 2368 | SECCLASS_PROCESS, PROCESS__SHARE, |
| 2369 | NULL); |
| 2370 | if (rc) |
| 2371 | return -EPERM; |
| 2372 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2373 | |
David Howells | a6f76f2 | 2008-11-14 10:39:24 +1100 | [diff] [blame] | 2374 | /* Make sure that anyone attempting to ptrace over a task that |
| 2375 | * changes its SID has the appropriate permit */ |
| 2376 | if (bprm->unsafe & |
| 2377 | (LSM_UNSAFE_PTRACE | LSM_UNSAFE_PTRACE_CAP)) { |
Paul Moore | 0c6181c | 2016-03-30 21:41:21 -0400 | [diff] [blame] | 2378 | u32 ptsid = ptrace_parent_sid(current); |
David Howells | a6f76f2 | 2008-11-14 10:39:24 +1100 | [diff] [blame] | 2379 | if (ptsid != 0) { |
| 2380 | rc = avc_has_perm(ptsid, new_tsec->sid, |
| 2381 | SECCLASS_PROCESS, |
| 2382 | PROCESS__PTRACE, NULL); |
| 2383 | if (rc) |
| 2384 | return -EPERM; |
| 2385 | } |
| 2386 | } |
| 2387 | |
| 2388 | /* Clear any possibly unsafe personality bits on exec: */ |
| 2389 | bprm->per_clear |= PER_CLEAR_ON_SETID; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2390 | } |
| 2391 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2392 | return 0; |
| 2393 | } |
| 2394 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 2395 | static int selinux_bprm_secureexec(struct linux_binprm *bprm) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2396 | { |
Paul Moore | 5fb4987 | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 2397 | const struct task_security_struct *tsec = current_security(); |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 2398 | u32 sid, osid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2399 | int atsecure = 0; |
| 2400 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 2401 | sid = tsec->sid; |
| 2402 | osid = tsec->osid; |
| 2403 | |
| 2404 | if (osid != sid) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2405 | /* Enable secure mode for SIDs transitions unless |
| 2406 | the noatsecure permission is granted between |
| 2407 | the two SIDs, i.e. ahp returns 0. */ |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 2408 | atsecure = avc_has_perm(osid, sid, |
David Howells | a6f76f2 | 2008-11-14 10:39:24 +1100 | [diff] [blame] | 2409 | SECCLASS_PROCESS, |
| 2410 | PROCESS__NOATSECURE, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2411 | } |
| 2412 | |
Casey Schaufler | b1d9e6b | 2015-05-02 15:11:42 -0700 | [diff] [blame] | 2413 | return !!atsecure; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2414 | } |
| 2415 | |
Al Viro | c3c073f | 2012-08-21 22:32:06 -0400 | [diff] [blame] | 2416 | static int match_file(const void *p, struct file *file, unsigned fd) |
| 2417 | { |
| 2418 | return file_has_perm(p, file, file_to_av(file)) ? fd + 1 : 0; |
| 2419 | } |
| 2420 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2421 | /* Derived from fs/exec.c:flush_old_files. */ |
David Howells | 745ca24 | 2008-11-14 10:39:22 +1100 | [diff] [blame] | 2422 | static inline void flush_unauthorized_files(const struct cred *cred, |
| 2423 | struct files_struct *files) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2424 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2425 | struct file *file, *devnull = NULL; |
Stephen Smalley | b20c812 | 2006-09-25 23:32:03 -0700 | [diff] [blame] | 2426 | struct tty_struct *tty; |
Peter Zijlstra | 24ec839 | 2006-12-08 02:36:04 -0800 | [diff] [blame] | 2427 | int drop_tty = 0; |
Al Viro | c3c073f | 2012-08-21 22:32:06 -0400 | [diff] [blame] | 2428 | unsigned n; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2429 | |
Peter Zijlstra | 24ec839 | 2006-12-08 02:36:04 -0800 | [diff] [blame] | 2430 | tty = get_current_tty(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2431 | if (tty) { |
Peter Hurley | 4a51096 | 2016-01-09 21:35:23 -0800 | [diff] [blame] | 2432 | spin_lock(&tty->files_lock); |
Eric Paris | 37dd0bd | 2008-10-31 17:40:00 -0400 | [diff] [blame] | 2433 | if (!list_empty(&tty->tty_files)) { |
Nick Piggin | d996b62 | 2010-08-18 04:37:36 +1000 | [diff] [blame] | 2434 | struct tty_file_private *file_priv; |
Eric Paris | 37dd0bd | 2008-10-31 17:40:00 -0400 | [diff] [blame] | 2435 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2436 | /* Revalidate access to controlling tty. |
David Howells | 13f8e98 | 2013-06-13 23:37:55 +0100 | [diff] [blame] | 2437 | Use file_path_has_perm on the tty path directly |
| 2438 | rather than using file_has_perm, as this particular |
| 2439 | open file may belong to another process and we are |
| 2440 | only interested in the inode-based check here. */ |
Nick Piggin | d996b62 | 2010-08-18 04:37:36 +1000 | [diff] [blame] | 2441 | file_priv = list_first_entry(&tty->tty_files, |
| 2442 | struct tty_file_private, list); |
| 2443 | file = file_priv->file; |
David Howells | 13f8e98 | 2013-06-13 23:37:55 +0100 | [diff] [blame] | 2444 | if (file_path_has_perm(cred, file, FILE__READ | FILE__WRITE)) |
Peter Zijlstra | 24ec839 | 2006-12-08 02:36:04 -0800 | [diff] [blame] | 2445 | drop_tty = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2446 | } |
Peter Hurley | 4a51096 | 2016-01-09 21:35:23 -0800 | [diff] [blame] | 2447 | spin_unlock(&tty->files_lock); |
Alan Cox | 452a00d | 2008-10-13 10:39:13 +0100 | [diff] [blame] | 2448 | tty_kref_put(tty); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2449 | } |
Eric W. Biederman | 98a27ba | 2007-05-08 00:26:56 -0700 | [diff] [blame] | 2450 | /* Reset controlling tty. */ |
| 2451 | if (drop_tty) |
| 2452 | no_tty(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2453 | |
| 2454 | /* Revalidate access to inherited open files. */ |
Al Viro | c3c073f | 2012-08-21 22:32:06 -0400 | [diff] [blame] | 2455 | n = iterate_fd(files, 0, match_file, cred); |
| 2456 | if (!n) /* none found? */ |
| 2457 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2458 | |
Al Viro | c3c073f | 2012-08-21 22:32:06 -0400 | [diff] [blame] | 2459 | devnull = dentry_open(&selinux_null, O_RDWR, cred); |
Al Viro | 45525b2 | 2012-10-16 13:30:07 -0400 | [diff] [blame] | 2460 | if (IS_ERR(devnull)) |
| 2461 | devnull = NULL; |
| 2462 | /* replace all the matching ones with this */ |
| 2463 | do { |
| 2464 | replace_fd(n - 1, devnull, 0); |
| 2465 | } while ((n = iterate_fd(files, n, match_file, cred)) != 0); |
| 2466 | if (devnull) |
Al Viro | c3c073f | 2012-08-21 22:32:06 -0400 | [diff] [blame] | 2467 | fput(devnull); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2468 | } |
| 2469 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2470 | /* |
David Howells | a6f76f2 | 2008-11-14 10:39:24 +1100 | [diff] [blame] | 2471 | * Prepare a process for imminent new credential changes due to exec |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2472 | */ |
David Howells | a6f76f2 | 2008-11-14 10:39:24 +1100 | [diff] [blame] | 2473 | static void selinux_bprm_committing_creds(struct linux_binprm *bprm) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2474 | { |
David Howells | a6f76f2 | 2008-11-14 10:39:24 +1100 | [diff] [blame] | 2475 | struct task_security_struct *new_tsec; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2476 | struct rlimit *rlim, *initrlim; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2477 | int rc, i; |
| 2478 | |
David Howells | a6f76f2 | 2008-11-14 10:39:24 +1100 | [diff] [blame] | 2479 | new_tsec = bprm->cred->security; |
| 2480 | if (new_tsec->sid == new_tsec->osid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2481 | return; |
| 2482 | |
| 2483 | /* Close files for which the new task SID is not authorized. */ |
David Howells | a6f76f2 | 2008-11-14 10:39:24 +1100 | [diff] [blame] | 2484 | flush_unauthorized_files(bprm->cred, current->files); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2485 | |
David Howells | a6f76f2 | 2008-11-14 10:39:24 +1100 | [diff] [blame] | 2486 | /* Always clear parent death signal on SID transitions. */ |
| 2487 | current->pdeath_signal = 0; |
| 2488 | |
| 2489 | /* Check whether the new SID can inherit resource limits from the old |
| 2490 | * SID. If not, reset all soft limits to the lower of the current |
| 2491 | * task's hard limit and the init task's soft limit. |
| 2492 | * |
| 2493 | * Note that the setting of hard limits (even to lower them) can be |
| 2494 | * controlled by the setrlimit check. The inclusion of the init task's |
| 2495 | * soft limit into the computation is to avoid resetting soft limits |
| 2496 | * higher than the default soft limit for cases where the default is |
| 2497 | * lower than the hard limit, e.g. RLIMIT_CORE or RLIMIT_STACK. |
| 2498 | */ |
| 2499 | rc = avc_has_perm(new_tsec->osid, new_tsec->sid, SECCLASS_PROCESS, |
| 2500 | PROCESS__RLIMITINH, NULL); |
| 2501 | if (rc) { |
Oleg Nesterov | eb2d55a | 2010-06-23 22:43:32 +0200 | [diff] [blame] | 2502 | /* protect against do_prlimit() */ |
| 2503 | task_lock(current); |
David Howells | a6f76f2 | 2008-11-14 10:39:24 +1100 | [diff] [blame] | 2504 | for (i = 0; i < RLIM_NLIMITS; i++) { |
| 2505 | rlim = current->signal->rlim + i; |
| 2506 | initrlim = init_task.signal->rlim + i; |
| 2507 | rlim->rlim_cur = min(rlim->rlim_max, initrlim->rlim_cur); |
| 2508 | } |
Oleg Nesterov | eb2d55a | 2010-06-23 22:43:32 +0200 | [diff] [blame] | 2509 | task_unlock(current); |
| 2510 | update_rlimit_cpu(current, rlimit(RLIMIT_CPU)); |
David Howells | a6f76f2 | 2008-11-14 10:39:24 +1100 | [diff] [blame] | 2511 | } |
| 2512 | } |
| 2513 | |
| 2514 | /* |
| 2515 | * Clean up the process immediately after the installation of new credentials |
| 2516 | * due to exec |
| 2517 | */ |
| 2518 | static void selinux_bprm_committed_creds(struct linux_binprm *bprm) |
| 2519 | { |
| 2520 | const struct task_security_struct *tsec = current_security(); |
| 2521 | struct itimerval itimer; |
David Howells | a6f76f2 | 2008-11-14 10:39:24 +1100 | [diff] [blame] | 2522 | u32 osid, sid; |
| 2523 | int rc, i; |
David Howells | a6f76f2 | 2008-11-14 10:39:24 +1100 | [diff] [blame] | 2524 | |
David Howells | a6f76f2 | 2008-11-14 10:39:24 +1100 | [diff] [blame] | 2525 | osid = tsec->osid; |
| 2526 | sid = tsec->sid; |
| 2527 | |
| 2528 | if (sid == osid) |
| 2529 | return; |
| 2530 | |
| 2531 | /* Check whether the new SID can inherit signal state from the old SID. |
| 2532 | * If not, clear itimers to avoid subsequent signal generation and |
| 2533 | * flush and unblock signals. |
| 2534 | * |
| 2535 | * This must occur _after_ the task SID has been updated so that any |
| 2536 | * kill done after the flush will be checked against the new SID. |
| 2537 | */ |
| 2538 | rc = avc_has_perm(osid, sid, SECCLASS_PROCESS, PROCESS__SIGINH, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2539 | if (rc) { |
| 2540 | memset(&itimer, 0, sizeof itimer); |
| 2541 | for (i = 0; i < 3; i++) |
| 2542 | do_setitimer(i, &itimer, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2543 | spin_lock_irq(¤t->sighand->siglock); |
Oleg Nesterov | 9e7c8f8 | 2015-06-04 16:22:16 -0400 | [diff] [blame] | 2544 | if (!fatal_signal_pending(current)) { |
| 2545 | flush_sigqueue(¤t->pending); |
| 2546 | flush_sigqueue(¤t->signal->shared_pending); |
David Howells | 3bcac02 | 2009-04-29 13:45:05 +0100 | [diff] [blame] | 2547 | flush_signal_handlers(current, 1); |
| 2548 | sigemptyset(¤t->blocked); |
Oleg Nesterov | 9e7c8f8 | 2015-06-04 16:22:16 -0400 | [diff] [blame] | 2549 | recalc_sigpending(); |
David Howells | 3bcac02 | 2009-04-29 13:45:05 +0100 | [diff] [blame] | 2550 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2551 | spin_unlock_irq(¤t->sighand->siglock); |
| 2552 | } |
| 2553 | |
David Howells | a6f76f2 | 2008-11-14 10:39:24 +1100 | [diff] [blame] | 2554 | /* Wake up the parent if it is waiting so that it can recheck |
| 2555 | * wait permission to the new task SID. */ |
Oleg Nesterov | ecd6de3 | 2009-04-29 16:02:24 +0200 | [diff] [blame] | 2556 | read_lock(&tasklist_lock); |
Oleg Nesterov | 0b7570e | 2009-09-23 15:56:46 -0700 | [diff] [blame] | 2557 | __wake_up_parent(current, current->real_parent); |
Oleg Nesterov | ecd6de3 | 2009-04-29 16:02:24 +0200 | [diff] [blame] | 2558 | read_unlock(&tasklist_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2559 | } |
| 2560 | |
| 2561 | /* superblock security operations */ |
| 2562 | |
| 2563 | static int selinux_sb_alloc_security(struct super_block *sb) |
| 2564 | { |
| 2565 | return superblock_alloc_security(sb); |
| 2566 | } |
| 2567 | |
| 2568 | static void selinux_sb_free_security(struct super_block *sb) |
| 2569 | { |
| 2570 | superblock_free_security(sb); |
| 2571 | } |
| 2572 | |
| 2573 | static inline int match_prefix(char *prefix, int plen, char *option, int olen) |
| 2574 | { |
| 2575 | if (plen > olen) |
| 2576 | return 0; |
| 2577 | |
| 2578 | return !memcmp(prefix, option, plen); |
| 2579 | } |
| 2580 | |
| 2581 | static inline int selinux_option(char *option, int len) |
| 2582 | { |
Eric Paris | 832cbd9 | 2008-04-01 13:24:09 -0400 | [diff] [blame] | 2583 | return (match_prefix(CONTEXT_STR, sizeof(CONTEXT_STR)-1, option, len) || |
| 2584 | match_prefix(FSCONTEXT_STR, sizeof(FSCONTEXT_STR)-1, option, len) || |
| 2585 | match_prefix(DEFCONTEXT_STR, sizeof(DEFCONTEXT_STR)-1, option, len) || |
David P. Quigley | 11689d4 | 2009-01-16 09:22:03 -0500 | [diff] [blame] | 2586 | match_prefix(ROOTCONTEXT_STR, sizeof(ROOTCONTEXT_STR)-1, option, len) || |
| 2587 | match_prefix(LABELSUPP_STR, sizeof(LABELSUPP_STR)-1, option, len)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2588 | } |
| 2589 | |
| 2590 | static inline void take_option(char **to, char *from, int *first, int len) |
| 2591 | { |
| 2592 | if (!*first) { |
| 2593 | **to = ','; |
| 2594 | *to += 1; |
Cory Olmo | 3528a95 | 2006-09-29 01:58:44 -0700 | [diff] [blame] | 2595 | } else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2596 | *first = 0; |
| 2597 | memcpy(*to, from, len); |
| 2598 | *to += len; |
| 2599 | } |
| 2600 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 2601 | static inline void take_selinux_option(char **to, char *from, int *first, |
| 2602 | int len) |
Cory Olmo | 3528a95 | 2006-09-29 01:58:44 -0700 | [diff] [blame] | 2603 | { |
| 2604 | int current_size = 0; |
| 2605 | |
| 2606 | if (!*first) { |
| 2607 | **to = '|'; |
| 2608 | *to += 1; |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 2609 | } else |
Cory Olmo | 3528a95 | 2006-09-29 01:58:44 -0700 | [diff] [blame] | 2610 | *first = 0; |
| 2611 | |
| 2612 | while (current_size < len) { |
| 2613 | if (*from != '"') { |
| 2614 | **to = *from; |
| 2615 | *to += 1; |
| 2616 | } |
| 2617 | from += 1; |
| 2618 | current_size += 1; |
| 2619 | } |
| 2620 | } |
| 2621 | |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 2622 | static int selinux_sb_copy_data(char *orig, char *copy) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2623 | { |
| 2624 | int fnosec, fsec, rc = 0; |
| 2625 | char *in_save, *in_curr, *in_end; |
| 2626 | char *sec_curr, *nosec_save, *nosec; |
Cory Olmo | 3528a95 | 2006-09-29 01:58:44 -0700 | [diff] [blame] | 2627 | int open_quote = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2628 | |
| 2629 | in_curr = orig; |
| 2630 | sec_curr = copy; |
| 2631 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2632 | nosec = (char *)get_zeroed_page(GFP_KERNEL); |
| 2633 | if (!nosec) { |
| 2634 | rc = -ENOMEM; |
| 2635 | goto out; |
| 2636 | } |
| 2637 | |
| 2638 | nosec_save = nosec; |
| 2639 | fnosec = fsec = 1; |
| 2640 | in_save = in_end = orig; |
| 2641 | |
| 2642 | do { |
Cory Olmo | 3528a95 | 2006-09-29 01:58:44 -0700 | [diff] [blame] | 2643 | if (*in_end == '"') |
| 2644 | open_quote = !open_quote; |
| 2645 | if ((*in_end == ',' && open_quote == 0) || |
| 2646 | *in_end == '\0') { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2647 | int len = in_end - in_curr; |
| 2648 | |
| 2649 | if (selinux_option(in_curr, len)) |
Cory Olmo | 3528a95 | 2006-09-29 01:58:44 -0700 | [diff] [blame] | 2650 | take_selinux_option(&sec_curr, in_curr, &fsec, len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2651 | else |
| 2652 | take_option(&nosec, in_curr, &fnosec, len); |
| 2653 | |
| 2654 | in_curr = in_end + 1; |
| 2655 | } |
| 2656 | } while (*in_end++); |
| 2657 | |
Eric Paris | 6931dfc | 2005-06-30 02:58:51 -0700 | [diff] [blame] | 2658 | strcpy(in_save, nosec_save); |
Gerald Schaefer | da3caa2 | 2005-06-21 17:15:18 -0700 | [diff] [blame] | 2659 | free_page((unsigned long)nosec_save); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2660 | out: |
| 2661 | return rc; |
| 2662 | } |
| 2663 | |
Eric Paris | 026eb16 | 2011-03-03 16:09:14 -0500 | [diff] [blame] | 2664 | static int selinux_sb_remount(struct super_block *sb, void *data) |
| 2665 | { |
| 2666 | int rc, i, *flags; |
| 2667 | struct security_mnt_opts opts; |
| 2668 | char *secdata, **mount_options; |
| 2669 | struct superblock_security_struct *sbsec = sb->s_security; |
| 2670 | |
| 2671 | if (!(sbsec->flags & SE_SBINITIALIZED)) |
| 2672 | return 0; |
| 2673 | |
| 2674 | if (!data) |
| 2675 | return 0; |
| 2676 | |
| 2677 | if (sb->s_type->fs_flags & FS_BINARY_MOUNTDATA) |
| 2678 | return 0; |
| 2679 | |
| 2680 | security_init_mnt_opts(&opts); |
| 2681 | secdata = alloc_secdata(); |
| 2682 | if (!secdata) |
| 2683 | return -ENOMEM; |
| 2684 | rc = selinux_sb_copy_data(data, secdata); |
| 2685 | if (rc) |
| 2686 | goto out_free_secdata; |
| 2687 | |
| 2688 | rc = selinux_parse_opts_str(secdata, &opts); |
| 2689 | if (rc) |
| 2690 | goto out_free_secdata; |
| 2691 | |
| 2692 | mount_options = opts.mnt_opts; |
| 2693 | flags = opts.mnt_opts_flags; |
| 2694 | |
| 2695 | for (i = 0; i < opts.num_mnt_opts; i++) { |
| 2696 | u32 sid; |
Eric Paris | 026eb16 | 2011-03-03 16:09:14 -0500 | [diff] [blame] | 2697 | |
Eric Paris | 12f348b | 2012-10-09 10:56:25 -0400 | [diff] [blame] | 2698 | if (flags[i] == SBLABEL_MNT) |
Eric Paris | 026eb16 | 2011-03-03 16:09:14 -0500 | [diff] [blame] | 2699 | continue; |
Rasmus Villemoes | 44be2f6 | 2015-10-21 17:44:25 -0400 | [diff] [blame] | 2700 | rc = security_context_str_to_sid(mount_options[i], &sid, GFP_KERNEL); |
Eric Paris | 026eb16 | 2011-03-03 16:09:14 -0500 | [diff] [blame] | 2701 | if (rc) { |
Rasmus Villemoes | 44be2f6 | 2015-10-21 17:44:25 -0400 | [diff] [blame] | 2702 | printk(KERN_WARNING "SELinux: security_context_str_to_sid" |
Linus Torvalds | 29b1deb | 2013-12-15 11:17:45 -0800 | [diff] [blame] | 2703 | "(%s) failed for (dev %s, type %s) errno=%d\n", |
| 2704 | mount_options[i], sb->s_id, sb->s_type->name, rc); |
Eric Paris | 026eb16 | 2011-03-03 16:09:14 -0500 | [diff] [blame] | 2705 | goto out_free_opts; |
| 2706 | } |
| 2707 | rc = -EINVAL; |
| 2708 | switch (flags[i]) { |
| 2709 | case FSCONTEXT_MNT: |
| 2710 | if (bad_option(sbsec, FSCONTEXT_MNT, sbsec->sid, sid)) |
| 2711 | goto out_bad_option; |
| 2712 | break; |
| 2713 | case CONTEXT_MNT: |
| 2714 | if (bad_option(sbsec, CONTEXT_MNT, sbsec->mntpoint_sid, sid)) |
| 2715 | goto out_bad_option; |
| 2716 | break; |
| 2717 | case ROOTCONTEXT_MNT: { |
| 2718 | struct inode_security_struct *root_isec; |
Andreas Gruenbacher | 83da53c5 | 2015-12-24 11:09:39 -0500 | [diff] [blame] | 2719 | root_isec = backing_inode_security(sb->s_root); |
Eric Paris | 026eb16 | 2011-03-03 16:09:14 -0500 | [diff] [blame] | 2720 | |
| 2721 | if (bad_option(sbsec, ROOTCONTEXT_MNT, root_isec->sid, sid)) |
| 2722 | goto out_bad_option; |
| 2723 | break; |
| 2724 | } |
| 2725 | case DEFCONTEXT_MNT: |
| 2726 | if (bad_option(sbsec, DEFCONTEXT_MNT, sbsec->def_sid, sid)) |
| 2727 | goto out_bad_option; |
| 2728 | break; |
| 2729 | default: |
| 2730 | goto out_free_opts; |
| 2731 | } |
| 2732 | } |
| 2733 | |
| 2734 | rc = 0; |
| 2735 | out_free_opts: |
| 2736 | security_free_mnt_opts(&opts); |
| 2737 | out_free_secdata: |
| 2738 | free_secdata(secdata); |
| 2739 | return rc; |
| 2740 | out_bad_option: |
| 2741 | printk(KERN_WARNING "SELinux: unable to change security options " |
Linus Torvalds | 29b1deb | 2013-12-15 11:17:45 -0800 | [diff] [blame] | 2742 | "during remount (dev %s, type=%s)\n", sb->s_id, |
| 2743 | sb->s_type->name); |
Eric Paris | 026eb16 | 2011-03-03 16:09:14 -0500 | [diff] [blame] | 2744 | goto out_free_opts; |
| 2745 | } |
| 2746 | |
James Morris | 12204e2 | 2008-12-19 10:44:42 +1100 | [diff] [blame] | 2747 | static int selinux_sb_kern_mount(struct super_block *sb, int flags, void *data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2748 | { |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 2749 | const struct cred *cred = current_cred(); |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 2750 | struct common_audit_data ad; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2751 | int rc; |
| 2752 | |
| 2753 | rc = superblock_doinit(sb, data); |
| 2754 | if (rc) |
| 2755 | return rc; |
| 2756 | |
James Morris | 7419224 | 2008-12-19 11:41:10 +1100 | [diff] [blame] | 2757 | /* Allow all mounts performed by the kernel */ |
| 2758 | if (flags & MS_KERNMOUNT) |
| 2759 | return 0; |
| 2760 | |
Eric Paris | 50c205f | 2012-04-04 15:01:43 -0400 | [diff] [blame] | 2761 | ad.type = LSM_AUDIT_DATA_DENTRY; |
Eric Paris | a269434 | 2011-04-25 13:10:27 -0400 | [diff] [blame] | 2762 | ad.u.dentry = sb->s_root; |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 2763 | return superblock_has_perm(cred, sb, FILESYSTEM__MOUNT, &ad); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2764 | } |
| 2765 | |
David Howells | 726c334 | 2006-06-23 02:02:58 -0700 | [diff] [blame] | 2766 | static int selinux_sb_statfs(struct dentry *dentry) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2767 | { |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 2768 | const struct cred *cred = current_cred(); |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 2769 | struct common_audit_data ad; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2770 | |
Eric Paris | 50c205f | 2012-04-04 15:01:43 -0400 | [diff] [blame] | 2771 | ad.type = LSM_AUDIT_DATA_DENTRY; |
Eric Paris | a269434 | 2011-04-25 13:10:27 -0400 | [diff] [blame] | 2772 | ad.u.dentry = dentry->d_sb->s_root; |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 2773 | return superblock_has_perm(cred, dentry->d_sb, FILESYSTEM__GETATTR, &ad); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2774 | } |
| 2775 | |
Al Viro | 808d4e3 | 2012-10-11 11:42:01 -0400 | [diff] [blame] | 2776 | static int selinux_mount(const char *dev_name, |
Al Viro | 8a04c43 | 2016-03-25 14:52:53 -0400 | [diff] [blame] | 2777 | const struct path *path, |
Al Viro | 808d4e3 | 2012-10-11 11:42:01 -0400 | [diff] [blame] | 2778 | const char *type, |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 2779 | unsigned long flags, |
| 2780 | void *data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2781 | { |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 2782 | const struct cred *cred = current_cred(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2783 | |
| 2784 | if (flags & MS_REMOUNT) |
Al Viro | d8c9584 | 2011-12-07 18:16:57 -0500 | [diff] [blame] | 2785 | return superblock_has_perm(cred, path->dentry->d_sb, |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 2786 | FILESYSTEM__REMOUNT, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2787 | else |
Eric Paris | 2875fa0 | 2011-04-28 16:04:24 -0400 | [diff] [blame] | 2788 | return path_has_perm(cred, path, FILE__MOUNTON); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2789 | } |
| 2790 | |
| 2791 | static int selinux_umount(struct vfsmount *mnt, int flags) |
| 2792 | { |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 2793 | const struct cred *cred = current_cred(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2794 | |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 2795 | return superblock_has_perm(cred, mnt->mnt_sb, |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 2796 | FILESYSTEM__UNMOUNT, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2797 | } |
| 2798 | |
| 2799 | /* inode security operations */ |
| 2800 | |
| 2801 | static int selinux_inode_alloc_security(struct inode *inode) |
| 2802 | { |
| 2803 | return inode_alloc_security(inode); |
| 2804 | } |
| 2805 | |
| 2806 | static void selinux_inode_free_security(struct inode *inode) |
| 2807 | { |
| 2808 | inode_free_security(inode); |
| 2809 | } |
| 2810 | |
David Quigley | d47be3d | 2013-05-22 12:50:34 -0400 | [diff] [blame] | 2811 | static int selinux_dentry_init_security(struct dentry *dentry, int mode, |
| 2812 | struct qstr *name, void **ctx, |
| 2813 | u32 *ctxlen) |
| 2814 | { |
David Quigley | d47be3d | 2013-05-22 12:50:34 -0400 | [diff] [blame] | 2815 | u32 newsid; |
| 2816 | int rc; |
| 2817 | |
David Howells | c3c188b | 2015-07-10 17:19:58 -0400 | [diff] [blame] | 2818 | rc = selinux_determine_inode_label(d_inode(dentry->d_parent), name, |
| 2819 | inode_mode_to_security_class(mode), |
| 2820 | &newsid); |
| 2821 | if (rc) |
| 2822 | return rc; |
David Quigley | d47be3d | 2013-05-22 12:50:34 -0400 | [diff] [blame] | 2823 | |
| 2824 | return security_sid_to_context(newsid, (char **)ctx, ctxlen); |
| 2825 | } |
| 2826 | |
Stephen Smalley | 5e41ff9 | 2005-09-09 13:01:35 -0700 | [diff] [blame] | 2827 | static int selinux_inode_init_security(struct inode *inode, struct inode *dir, |
Tetsuo Handa | 9548906 | 2013-07-25 05:44:02 +0900 | [diff] [blame] | 2828 | const struct qstr *qstr, |
| 2829 | const char **name, |
Eric Paris | 2a7dba3 | 2011-02-01 11:05:39 -0500 | [diff] [blame] | 2830 | void **value, size_t *len) |
Stephen Smalley | 5e41ff9 | 2005-09-09 13:01:35 -0700 | [diff] [blame] | 2831 | { |
Paul Moore | 5fb4987 | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 2832 | const struct task_security_struct *tsec = current_security(); |
Stephen Smalley | 5e41ff9 | 2005-09-09 13:01:35 -0700 | [diff] [blame] | 2833 | struct superblock_security_struct *sbsec; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 2834 | u32 sid, newsid, clen; |
Stephen Smalley | 5e41ff9 | 2005-09-09 13:01:35 -0700 | [diff] [blame] | 2835 | int rc; |
Tetsuo Handa | 9548906 | 2013-07-25 05:44:02 +0900 | [diff] [blame] | 2836 | char *context; |
Stephen Smalley | 5e41ff9 | 2005-09-09 13:01:35 -0700 | [diff] [blame] | 2837 | |
Stephen Smalley | 5e41ff9 | 2005-09-09 13:01:35 -0700 | [diff] [blame] | 2838 | sbsec = dir->i_sb->s_security; |
Stephen Smalley | 5e41ff9 | 2005-09-09 13:01:35 -0700 | [diff] [blame] | 2839 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 2840 | sid = tsec->sid; |
| 2841 | newsid = tsec->create_sid; |
| 2842 | |
David Howells | c3c188b | 2015-07-10 17:19:58 -0400 | [diff] [blame] | 2843 | rc = selinux_determine_inode_label( |
| 2844 | dir, qstr, |
| 2845 | inode_mode_to_security_class(inode->i_mode), |
| 2846 | &newsid); |
| 2847 | if (rc) |
| 2848 | return rc; |
Stephen Smalley | 5e41ff9 | 2005-09-09 13:01:35 -0700 | [diff] [blame] | 2849 | |
Eric Paris | 296fddf | 2006-09-25 23:32:00 -0700 | [diff] [blame] | 2850 | /* Possibly defer initialization to selinux_complete_init. */ |
David P. Quigley | 0d90a7e | 2009-01-16 09:22:02 -0500 | [diff] [blame] | 2851 | if (sbsec->flags & SE_SBINITIALIZED) { |
Eric Paris | 296fddf | 2006-09-25 23:32:00 -0700 | [diff] [blame] | 2852 | struct inode_security_struct *isec = inode->i_security; |
| 2853 | isec->sclass = inode_mode_to_security_class(inode->i_mode); |
| 2854 | isec->sid = newsid; |
Andreas Gruenbacher | 6f3be9f | 2015-12-24 11:09:40 -0500 | [diff] [blame] | 2855 | isec->initialized = LABEL_INITIALIZED; |
Eric Paris | 296fddf | 2006-09-25 23:32:00 -0700 | [diff] [blame] | 2856 | } |
Stephen Smalley | 5e41ff9 | 2005-09-09 13:01:35 -0700 | [diff] [blame] | 2857 | |
Eric Paris | 12f348b | 2012-10-09 10:56:25 -0400 | [diff] [blame] | 2858 | if (!ss_initialized || !(sbsec->flags & SBLABEL_MNT)) |
Stephen Smalley | 25a74f3 | 2005-11-08 21:34:33 -0800 | [diff] [blame] | 2859 | return -EOPNOTSUPP; |
| 2860 | |
Tetsuo Handa | 9548906 | 2013-07-25 05:44:02 +0900 | [diff] [blame] | 2861 | if (name) |
| 2862 | *name = XATTR_SELINUX_SUFFIX; |
Stephen Smalley | 570bc1c | 2005-09-09 13:01:43 -0700 | [diff] [blame] | 2863 | |
| 2864 | if (value && len) { |
Stephen Smalley | 12b29f3 | 2008-05-07 13:03:20 -0400 | [diff] [blame] | 2865 | rc = security_sid_to_context_force(newsid, &context, &clen); |
Tetsuo Handa | 9548906 | 2013-07-25 05:44:02 +0900 | [diff] [blame] | 2866 | if (rc) |
Stephen Smalley | 570bc1c | 2005-09-09 13:01:43 -0700 | [diff] [blame] | 2867 | return rc; |
Stephen Smalley | 570bc1c | 2005-09-09 13:01:43 -0700 | [diff] [blame] | 2868 | *value = context; |
| 2869 | *len = clen; |
| 2870 | } |
Stephen Smalley | 5e41ff9 | 2005-09-09 13:01:35 -0700 | [diff] [blame] | 2871 | |
Stephen Smalley | 5e41ff9 | 2005-09-09 13:01:35 -0700 | [diff] [blame] | 2872 | return 0; |
| 2873 | } |
| 2874 | |
Al Viro | 4acdaf2 | 2011-07-26 01:42:34 -0400 | [diff] [blame] | 2875 | static int selinux_inode_create(struct inode *dir, struct dentry *dentry, umode_t mode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2876 | { |
| 2877 | return may_create(dir, dentry, SECCLASS_FILE); |
| 2878 | } |
| 2879 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2880 | static int selinux_inode_link(struct dentry *old_dentry, struct inode *dir, struct dentry *new_dentry) |
| 2881 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2882 | return may_link(dir, old_dentry, MAY_LINK); |
| 2883 | } |
| 2884 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2885 | static int selinux_inode_unlink(struct inode *dir, struct dentry *dentry) |
| 2886 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2887 | return may_link(dir, dentry, MAY_UNLINK); |
| 2888 | } |
| 2889 | |
| 2890 | static int selinux_inode_symlink(struct inode *dir, struct dentry *dentry, const char *name) |
| 2891 | { |
| 2892 | return may_create(dir, dentry, SECCLASS_LNK_FILE); |
| 2893 | } |
| 2894 | |
Al Viro | 18bb1db | 2011-07-26 01:41:39 -0400 | [diff] [blame] | 2895 | static int selinux_inode_mkdir(struct inode *dir, struct dentry *dentry, umode_t mask) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2896 | { |
| 2897 | return may_create(dir, dentry, SECCLASS_DIR); |
| 2898 | } |
| 2899 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2900 | static int selinux_inode_rmdir(struct inode *dir, struct dentry *dentry) |
| 2901 | { |
| 2902 | return may_link(dir, dentry, MAY_RMDIR); |
| 2903 | } |
| 2904 | |
Al Viro | 1a67aaf | 2011-07-26 01:52:52 -0400 | [diff] [blame] | 2905 | static int selinux_inode_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2906 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2907 | return may_create(dir, dentry, inode_mode_to_security_class(mode)); |
| 2908 | } |
| 2909 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2910 | static int selinux_inode_rename(struct inode *old_inode, struct dentry *old_dentry, |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 2911 | struct inode *new_inode, struct dentry *new_dentry) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2912 | { |
| 2913 | return may_rename(old_inode, old_dentry, new_inode, new_dentry); |
| 2914 | } |
| 2915 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2916 | static int selinux_inode_readlink(struct dentry *dentry) |
| 2917 | { |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 2918 | const struct cred *cred = current_cred(); |
| 2919 | |
Eric Paris | 2875fa0 | 2011-04-28 16:04:24 -0400 | [diff] [blame] | 2920 | return dentry_has_perm(cred, dentry, FILE__READ); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2921 | } |
| 2922 | |
NeilBrown | bda0be7 | 2015-03-23 13:37:39 +1100 | [diff] [blame] | 2923 | static int selinux_inode_follow_link(struct dentry *dentry, struct inode *inode, |
| 2924 | bool rcu) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2925 | { |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 2926 | const struct cred *cred = current_cred(); |
NeilBrown | bda0be7 | 2015-03-23 13:37:39 +1100 | [diff] [blame] | 2927 | struct common_audit_data ad; |
| 2928 | struct inode_security_struct *isec; |
| 2929 | u32 sid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2930 | |
NeilBrown | bda0be7 | 2015-03-23 13:37:39 +1100 | [diff] [blame] | 2931 | validate_creds(cred); |
| 2932 | |
| 2933 | ad.type = LSM_AUDIT_DATA_DENTRY; |
| 2934 | ad.u.dentry = dentry; |
| 2935 | sid = cred_sid(cred); |
Andreas Gruenbacher | 5d226df | 2015-12-24 11:09:40 -0500 | [diff] [blame] | 2936 | isec = inode_security_rcu(inode, rcu); |
| 2937 | if (IS_ERR(isec)) |
| 2938 | return PTR_ERR(isec); |
NeilBrown | bda0be7 | 2015-03-23 13:37:39 +1100 | [diff] [blame] | 2939 | |
| 2940 | return avc_has_perm_flags(sid, isec->sid, isec->sclass, FILE__READ, &ad, |
| 2941 | rcu ? MAY_NOT_BLOCK : 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2942 | } |
| 2943 | |
Eric Paris | d4cf970d | 2012-04-04 15:01:42 -0400 | [diff] [blame] | 2944 | static noinline int audit_inode_permission(struct inode *inode, |
| 2945 | u32 perms, u32 audited, u32 denied, |
Stephen Smalley | 626b974 | 2014-04-29 11:29:04 -0700 | [diff] [blame] | 2946 | int result, |
Eric Paris | d4cf970d | 2012-04-04 15:01:42 -0400 | [diff] [blame] | 2947 | unsigned flags) |
| 2948 | { |
| 2949 | struct common_audit_data ad; |
Eric Paris | d4cf970d | 2012-04-04 15:01:42 -0400 | [diff] [blame] | 2950 | struct inode_security_struct *isec = inode->i_security; |
| 2951 | int rc; |
| 2952 | |
Eric Paris | 50c205f | 2012-04-04 15:01:43 -0400 | [diff] [blame] | 2953 | ad.type = LSM_AUDIT_DATA_INODE; |
Eric Paris | d4cf970d | 2012-04-04 15:01:42 -0400 | [diff] [blame] | 2954 | ad.u.inode = inode; |
| 2955 | |
| 2956 | rc = slow_avc_audit(current_sid(), isec->sid, isec->sclass, perms, |
Stephen Smalley | 626b974 | 2014-04-29 11:29:04 -0700 | [diff] [blame] | 2957 | audited, denied, result, &ad, flags); |
Eric Paris | d4cf970d | 2012-04-04 15:01:42 -0400 | [diff] [blame] | 2958 | if (rc) |
| 2959 | return rc; |
| 2960 | return 0; |
| 2961 | } |
| 2962 | |
Al Viro | e74f71e | 2011-06-20 19:38:15 -0400 | [diff] [blame] | 2963 | static int selinux_inode_permission(struct inode *inode, int mask) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2964 | { |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 2965 | const struct cred *cred = current_cred(); |
Eric Paris | b782e0a | 2010-07-23 11:44:03 -0400 | [diff] [blame] | 2966 | u32 perms; |
| 2967 | bool from_access; |
Al Viro | cf1dd1d | 2011-06-20 19:44:08 -0400 | [diff] [blame] | 2968 | unsigned flags = mask & MAY_NOT_BLOCK; |
Eric Paris | 2e33405 | 2012-04-04 15:01:42 -0400 | [diff] [blame] | 2969 | struct inode_security_struct *isec; |
| 2970 | u32 sid; |
| 2971 | struct av_decision avd; |
| 2972 | int rc, rc2; |
| 2973 | u32 audited, denied; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2974 | |
Eric Paris | b782e0a | 2010-07-23 11:44:03 -0400 | [diff] [blame] | 2975 | from_access = mask & MAY_ACCESS; |
Eric Paris | d09ca73 | 2010-07-23 11:43:57 -0400 | [diff] [blame] | 2976 | mask &= (MAY_READ|MAY_WRITE|MAY_EXEC|MAY_APPEND); |
| 2977 | |
Eric Paris | b782e0a | 2010-07-23 11:44:03 -0400 | [diff] [blame] | 2978 | /* No permission to check. Existence test. */ |
| 2979 | if (!mask) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2980 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2981 | |
Eric Paris | 2e33405 | 2012-04-04 15:01:42 -0400 | [diff] [blame] | 2982 | validate_creds(cred); |
Eric Paris | b782e0a | 2010-07-23 11:44:03 -0400 | [diff] [blame] | 2983 | |
Eric Paris | 2e33405 | 2012-04-04 15:01:42 -0400 | [diff] [blame] | 2984 | if (unlikely(IS_PRIVATE(inode))) |
| 2985 | return 0; |
Eric Paris | b782e0a | 2010-07-23 11:44:03 -0400 | [diff] [blame] | 2986 | |
| 2987 | perms = file_mask_to_av(inode->i_mode, mask); |
| 2988 | |
Eric Paris | 2e33405 | 2012-04-04 15:01:42 -0400 | [diff] [blame] | 2989 | sid = cred_sid(cred); |
Andreas Gruenbacher | 5d226df | 2015-12-24 11:09:40 -0500 | [diff] [blame] | 2990 | isec = inode_security_rcu(inode, flags & MAY_NOT_BLOCK); |
| 2991 | if (IS_ERR(isec)) |
| 2992 | return PTR_ERR(isec); |
Eric Paris | 2e33405 | 2012-04-04 15:01:42 -0400 | [diff] [blame] | 2993 | |
| 2994 | rc = avc_has_perm_noaudit(sid, isec->sid, isec->sclass, perms, 0, &avd); |
| 2995 | audited = avc_audit_required(perms, &avd, rc, |
| 2996 | from_access ? FILE__AUDIT_ACCESS : 0, |
| 2997 | &denied); |
| 2998 | if (likely(!audited)) |
| 2999 | return rc; |
| 3000 | |
Stephen Smalley | 626b974 | 2014-04-29 11:29:04 -0700 | [diff] [blame] | 3001 | rc2 = audit_inode_permission(inode, perms, audited, denied, rc, flags); |
Eric Paris | 2e33405 | 2012-04-04 15:01:42 -0400 | [diff] [blame] | 3002 | if (rc2) |
| 3003 | return rc2; |
| 3004 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3005 | } |
| 3006 | |
| 3007 | static int selinux_inode_setattr(struct dentry *dentry, struct iattr *iattr) |
| 3008 | { |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 3009 | const struct cred *cred = current_cred(); |
Amerigo Wang | bc6a600 | 2009-08-20 19:29:02 -0700 | [diff] [blame] | 3010 | unsigned int ia_valid = iattr->ia_valid; |
Eric Paris | 95dbf73 | 2012-04-04 13:45:34 -0400 | [diff] [blame] | 3011 | __u32 av = FILE__WRITE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3012 | |
Amerigo Wang | bc6a600 | 2009-08-20 19:29:02 -0700 | [diff] [blame] | 3013 | /* ATTR_FORCE is just used for ATTR_KILL_S[UG]ID. */ |
| 3014 | if (ia_valid & ATTR_FORCE) { |
| 3015 | ia_valid &= ~(ATTR_KILL_SUID | ATTR_KILL_SGID | ATTR_MODE | |
| 3016 | ATTR_FORCE); |
| 3017 | if (!ia_valid) |
| 3018 | return 0; |
| 3019 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3020 | |
Amerigo Wang | bc6a600 | 2009-08-20 19:29:02 -0700 | [diff] [blame] | 3021 | if (ia_valid & (ATTR_MODE | ATTR_UID | ATTR_GID | |
| 3022 | ATTR_ATIME_SET | ATTR_MTIME_SET | ATTR_TIMES_SET)) |
Eric Paris | 2875fa0 | 2011-04-28 16:04:24 -0400 | [diff] [blame] | 3023 | return dentry_has_perm(cred, dentry, FILE__SETATTR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3024 | |
Jeff Vander Stoep | 44d37ad | 2015-10-21 17:44:25 -0400 | [diff] [blame] | 3025 | if (selinux_policycap_openperm && (ia_valid & ATTR_SIZE) |
| 3026 | && !(ia_valid & ATTR_FILE)) |
Eric Paris | 95dbf73 | 2012-04-04 13:45:34 -0400 | [diff] [blame] | 3027 | av |= FILE__OPEN; |
| 3028 | |
| 3029 | return dentry_has_perm(cred, dentry, av); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3030 | } |
| 3031 | |
Al Viro | 3f7036a | 2015-03-08 19:28:30 -0400 | [diff] [blame] | 3032 | static int selinux_inode_getattr(const struct path *path) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3033 | { |
Al Viro | 3f7036a | 2015-03-08 19:28:30 -0400 | [diff] [blame] | 3034 | return path_has_perm(current_cred(), path, FILE__GETATTR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3035 | } |
| 3036 | |
David Howells | 8f0cfa5 | 2008-04-29 00:59:41 -0700 | [diff] [blame] | 3037 | static int selinux_inode_setotherxattr(struct dentry *dentry, const char *name) |
Serge E. Hallyn | b537677 | 2007-10-16 23:31:36 -0700 | [diff] [blame] | 3038 | { |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 3039 | const struct cred *cred = current_cred(); |
| 3040 | |
Serge E. Hallyn | b537677 | 2007-10-16 23:31:36 -0700 | [diff] [blame] | 3041 | if (!strncmp(name, XATTR_SECURITY_PREFIX, |
| 3042 | sizeof XATTR_SECURITY_PREFIX - 1)) { |
| 3043 | if (!strcmp(name, XATTR_NAME_CAPS)) { |
| 3044 | if (!capable(CAP_SETFCAP)) |
| 3045 | return -EPERM; |
| 3046 | } else if (!capable(CAP_SYS_ADMIN)) { |
| 3047 | /* A different attribute in the security namespace. |
| 3048 | Restrict to administrator. */ |
| 3049 | return -EPERM; |
| 3050 | } |
| 3051 | } |
| 3052 | |
| 3053 | /* Not an attribute we recognize, so just check the |
| 3054 | ordinary setattr permission. */ |
Eric Paris | 2875fa0 | 2011-04-28 16:04:24 -0400 | [diff] [blame] | 3055 | return dentry_has_perm(cred, dentry, FILE__SETATTR); |
Serge E. Hallyn | b537677 | 2007-10-16 23:31:36 -0700 | [diff] [blame] | 3056 | } |
| 3057 | |
David Howells | 8f0cfa5 | 2008-04-29 00:59:41 -0700 | [diff] [blame] | 3058 | static int selinux_inode_setxattr(struct dentry *dentry, const char *name, |
| 3059 | const void *value, size_t size, int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3060 | { |
David Howells | c6f493d | 2015-03-17 22:26:22 +0000 | [diff] [blame] | 3061 | struct inode *inode = d_backing_inode(dentry); |
Paul Moore | 20cdef8 | 2016-04-04 14:14:42 -0400 | [diff] [blame] | 3062 | struct inode_security_struct *isec; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3063 | struct superblock_security_struct *sbsec; |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 3064 | struct common_audit_data ad; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 3065 | u32 newsid, sid = current_sid(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3066 | int rc = 0; |
| 3067 | |
Serge E. Hallyn | b537677 | 2007-10-16 23:31:36 -0700 | [diff] [blame] | 3068 | if (strcmp(name, XATTR_NAME_SELINUX)) |
| 3069 | return selinux_inode_setotherxattr(dentry, name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3070 | |
| 3071 | sbsec = inode->i_sb->s_security; |
Eric Paris | 12f348b | 2012-10-09 10:56:25 -0400 | [diff] [blame] | 3072 | if (!(sbsec->flags & SBLABEL_MNT)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3073 | return -EOPNOTSUPP; |
| 3074 | |
Serge E. Hallyn | 2e14967 | 2011-03-23 16:43:26 -0700 | [diff] [blame] | 3075 | if (!inode_owner_or_capable(inode)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3076 | return -EPERM; |
| 3077 | |
Eric Paris | 50c205f | 2012-04-04 15:01:43 -0400 | [diff] [blame] | 3078 | ad.type = LSM_AUDIT_DATA_DENTRY; |
Eric Paris | a269434 | 2011-04-25 13:10:27 -0400 | [diff] [blame] | 3079 | ad.u.dentry = dentry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3080 | |
Paul Moore | 20cdef8 | 2016-04-04 14:14:42 -0400 | [diff] [blame] | 3081 | isec = backing_inode_security(dentry); |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 3082 | rc = avc_has_perm(sid, isec->sid, isec->sclass, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3083 | FILE__RELABELFROM, &ad); |
| 3084 | if (rc) |
| 3085 | return rc; |
| 3086 | |
Nikolay Aleksandrov | 52a4c64 | 2014-03-07 12:44:19 +0100 | [diff] [blame] | 3087 | rc = security_context_to_sid(value, size, &newsid, GFP_KERNEL); |
Stephen Smalley | 12b29f3 | 2008-05-07 13:03:20 -0400 | [diff] [blame] | 3088 | if (rc == -EINVAL) { |
Eric Paris | d6ea83e | 2012-04-04 13:45:49 -0400 | [diff] [blame] | 3089 | if (!capable(CAP_MAC_ADMIN)) { |
| 3090 | struct audit_buffer *ab; |
| 3091 | size_t audit_size; |
| 3092 | const char *str; |
| 3093 | |
| 3094 | /* We strip a nul only if it is at the end, otherwise the |
| 3095 | * context contains a nul and we should audit that */ |
Al Viro | e3fea3f | 2012-06-09 08:15:16 +0100 | [diff] [blame] | 3096 | if (value) { |
| 3097 | str = value; |
| 3098 | if (str[size - 1] == '\0') |
| 3099 | audit_size = size - 1; |
| 3100 | else |
| 3101 | audit_size = size; |
| 3102 | } else { |
| 3103 | str = ""; |
| 3104 | audit_size = 0; |
| 3105 | } |
Eric Paris | d6ea83e | 2012-04-04 13:45:49 -0400 | [diff] [blame] | 3106 | ab = audit_log_start(current->audit_context, GFP_ATOMIC, AUDIT_SELINUX_ERR); |
| 3107 | audit_log_format(ab, "op=setxattr invalid_context="); |
| 3108 | audit_log_n_untrustedstring(ab, value, audit_size); |
| 3109 | audit_log_end(ab); |
| 3110 | |
Stephen Smalley | 12b29f3 | 2008-05-07 13:03:20 -0400 | [diff] [blame] | 3111 | return rc; |
Eric Paris | d6ea83e | 2012-04-04 13:45:49 -0400 | [diff] [blame] | 3112 | } |
Stephen Smalley | 12b29f3 | 2008-05-07 13:03:20 -0400 | [diff] [blame] | 3113 | rc = security_context_to_sid_force(value, size, &newsid); |
| 3114 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3115 | if (rc) |
| 3116 | return rc; |
| 3117 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 3118 | rc = avc_has_perm(sid, newsid, isec->sclass, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3119 | FILE__RELABELTO, &ad); |
| 3120 | if (rc) |
| 3121 | return rc; |
| 3122 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 3123 | rc = security_validate_transition(isec->sid, newsid, sid, |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3124 | isec->sclass); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3125 | if (rc) |
| 3126 | return rc; |
| 3127 | |
| 3128 | return avc_has_perm(newsid, |
| 3129 | sbsec->sid, |
| 3130 | SECCLASS_FILESYSTEM, |
| 3131 | FILESYSTEM__ASSOCIATE, |
| 3132 | &ad); |
| 3133 | } |
| 3134 | |
David Howells | 8f0cfa5 | 2008-04-29 00:59:41 -0700 | [diff] [blame] | 3135 | static void selinux_inode_post_setxattr(struct dentry *dentry, const char *name, |
Eric Paris | f526971 | 2008-05-14 11:27:45 -0400 | [diff] [blame] | 3136 | const void *value, size_t size, |
David Howells | 8f0cfa5 | 2008-04-29 00:59:41 -0700 | [diff] [blame] | 3137 | int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3138 | { |
David Howells | c6f493d | 2015-03-17 22:26:22 +0000 | [diff] [blame] | 3139 | struct inode *inode = d_backing_inode(dentry); |
Paul Moore | 20cdef8 | 2016-04-04 14:14:42 -0400 | [diff] [blame] | 3140 | struct inode_security_struct *isec; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3141 | u32 newsid; |
| 3142 | int rc; |
| 3143 | |
| 3144 | if (strcmp(name, XATTR_NAME_SELINUX)) { |
| 3145 | /* Not an attribute we recognize, so nothing to do. */ |
| 3146 | return; |
| 3147 | } |
| 3148 | |
Stephen Smalley | 12b29f3 | 2008-05-07 13:03:20 -0400 | [diff] [blame] | 3149 | rc = security_context_to_sid_force(value, size, &newsid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3150 | if (rc) { |
Stephen Smalley | 12b29f3 | 2008-05-07 13:03:20 -0400 | [diff] [blame] | 3151 | printk(KERN_ERR "SELinux: unable to map context to SID" |
| 3152 | "for (%s, %lu), rc=%d\n", |
| 3153 | inode->i_sb->s_id, inode->i_ino, -rc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3154 | return; |
| 3155 | } |
| 3156 | |
Paul Moore | 20cdef8 | 2016-04-04 14:14:42 -0400 | [diff] [blame] | 3157 | isec = backing_inode_security(dentry); |
David Quigley | aa9c266 | 2013-05-22 12:50:44 -0400 | [diff] [blame] | 3158 | isec->sclass = inode_mode_to_security_class(inode->i_mode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3159 | isec->sid = newsid; |
Andreas Gruenbacher | 6f3be9f | 2015-12-24 11:09:40 -0500 | [diff] [blame] | 3160 | isec->initialized = LABEL_INITIALIZED; |
David Quigley | aa9c266 | 2013-05-22 12:50:44 -0400 | [diff] [blame] | 3161 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3162 | return; |
| 3163 | } |
| 3164 | |
David Howells | 8f0cfa5 | 2008-04-29 00:59:41 -0700 | [diff] [blame] | 3165 | static int selinux_inode_getxattr(struct dentry *dentry, const char *name) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3166 | { |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 3167 | const struct cred *cred = current_cred(); |
| 3168 | |
Eric Paris | 2875fa0 | 2011-04-28 16:04:24 -0400 | [diff] [blame] | 3169 | return dentry_has_perm(cred, dentry, FILE__GETATTR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3170 | } |
| 3171 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3172 | static int selinux_inode_listxattr(struct dentry *dentry) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3173 | { |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 3174 | const struct cred *cred = current_cred(); |
| 3175 | |
Eric Paris | 2875fa0 | 2011-04-28 16:04:24 -0400 | [diff] [blame] | 3176 | return dentry_has_perm(cred, dentry, FILE__GETATTR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3177 | } |
| 3178 | |
David Howells | 8f0cfa5 | 2008-04-29 00:59:41 -0700 | [diff] [blame] | 3179 | static int selinux_inode_removexattr(struct dentry *dentry, const char *name) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3180 | { |
Serge E. Hallyn | b537677 | 2007-10-16 23:31:36 -0700 | [diff] [blame] | 3181 | if (strcmp(name, XATTR_NAME_SELINUX)) |
| 3182 | return selinux_inode_setotherxattr(dentry, name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3183 | |
| 3184 | /* No one is allowed to remove a SELinux security label. |
| 3185 | You can change the label, but all data must be labeled. */ |
| 3186 | return -EACCES; |
| 3187 | } |
| 3188 | |
James Morris | d381d8a | 2005-10-30 14:59:22 -0800 | [diff] [blame] | 3189 | /* |
Stephen Smalley | abc69bb | 2008-05-21 14:16:12 -0400 | [diff] [blame] | 3190 | * Copy the inode security context value to the user. |
James Morris | d381d8a | 2005-10-30 14:59:22 -0800 | [diff] [blame] | 3191 | * |
| 3192 | * Permission check is handled by selinux_inode_getxattr hook. |
| 3193 | */ |
Andreas Gruenbacher | ea861df | 2015-12-24 11:09:39 -0500 | [diff] [blame] | 3194 | static int selinux_inode_getsecurity(struct inode *inode, const char *name, void **buffer, bool alloc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3195 | { |
David P. Quigley | 4249259 | 2008-02-04 22:29:39 -0800 | [diff] [blame] | 3196 | u32 size; |
| 3197 | int error; |
| 3198 | char *context = NULL; |
Paul Moore | 20cdef8 | 2016-04-04 14:14:42 -0400 | [diff] [blame] | 3199 | struct inode_security_struct *isec; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3200 | |
Dustin Kirkland | 8c8570f | 2005-11-03 17:15:16 +0000 | [diff] [blame] | 3201 | if (strcmp(name, XATTR_SELINUX_SUFFIX)) |
| 3202 | return -EOPNOTSUPP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3203 | |
Stephen Smalley | abc69bb | 2008-05-21 14:16:12 -0400 | [diff] [blame] | 3204 | /* |
| 3205 | * If the caller has CAP_MAC_ADMIN, then get the raw context |
| 3206 | * value even if it is not defined by current policy; otherwise, |
| 3207 | * use the in-core value under current policy. |
| 3208 | * Use the non-auditing forms of the permission checks since |
| 3209 | * getxattr may be called by unprivileged processes commonly |
| 3210 | * and lack of permission just means that we fall back to the |
| 3211 | * in-core context value, not a denial. |
| 3212 | */ |
Casey Schaufler | b1d9e6b | 2015-05-02 15:11:42 -0700 | [diff] [blame] | 3213 | error = cap_capable(current_cred(), &init_user_ns, CAP_MAC_ADMIN, |
| 3214 | SECURITY_CAP_NOAUDIT); |
| 3215 | if (!error) |
| 3216 | error = cred_has_capability(current_cred(), CAP_MAC_ADMIN, |
Stephen Smalley | 8e4ff6f | 2016-04-08 13:52:00 -0400 | [diff] [blame] | 3217 | SECURITY_CAP_NOAUDIT, true); |
Paul Moore | 20cdef8 | 2016-04-04 14:14:42 -0400 | [diff] [blame] | 3218 | isec = inode_security(inode); |
Stephen Smalley | abc69bb | 2008-05-21 14:16:12 -0400 | [diff] [blame] | 3219 | if (!error) |
| 3220 | error = security_sid_to_context_force(isec->sid, &context, |
| 3221 | &size); |
| 3222 | else |
| 3223 | error = security_sid_to_context(isec->sid, &context, &size); |
David P. Quigley | 4249259 | 2008-02-04 22:29:39 -0800 | [diff] [blame] | 3224 | if (error) |
| 3225 | return error; |
| 3226 | error = size; |
| 3227 | if (alloc) { |
| 3228 | *buffer = context; |
| 3229 | goto out_nofree; |
| 3230 | } |
| 3231 | kfree(context); |
| 3232 | out_nofree: |
| 3233 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3234 | } |
| 3235 | |
| 3236 | static int selinux_inode_setsecurity(struct inode *inode, const char *name, |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3237 | const void *value, size_t size, int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3238 | { |
Paul Moore | 2c97165 | 2016-04-19 16:36:28 -0400 | [diff] [blame] | 3239 | struct inode_security_struct *isec = inode_security_novalidate(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3240 | u32 newsid; |
| 3241 | int rc; |
| 3242 | |
| 3243 | if (strcmp(name, XATTR_SELINUX_SUFFIX)) |
| 3244 | return -EOPNOTSUPP; |
| 3245 | |
| 3246 | if (!value || !size) |
| 3247 | return -EACCES; |
| 3248 | |
Rasmus Villemoes | 20ba96a | 2015-10-21 17:44:26 -0400 | [diff] [blame] | 3249 | rc = security_context_to_sid(value, size, &newsid, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3250 | if (rc) |
| 3251 | return rc; |
| 3252 | |
David Quigley | aa9c266 | 2013-05-22 12:50:44 -0400 | [diff] [blame] | 3253 | isec->sclass = inode_mode_to_security_class(inode->i_mode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3254 | isec->sid = newsid; |
Andreas Gruenbacher | 6f3be9f | 2015-12-24 11:09:40 -0500 | [diff] [blame] | 3255 | isec->initialized = LABEL_INITIALIZED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3256 | return 0; |
| 3257 | } |
| 3258 | |
| 3259 | static int selinux_inode_listsecurity(struct inode *inode, char *buffer, size_t buffer_size) |
| 3260 | { |
| 3261 | const int len = sizeof(XATTR_NAME_SELINUX); |
| 3262 | if (buffer && len <= buffer_size) |
| 3263 | memcpy(buffer, XATTR_NAME_SELINUX, len); |
| 3264 | return len; |
| 3265 | } |
| 3266 | |
Andreas Gruenbacher | d6335d7 | 2015-12-24 11:09:39 -0500 | [diff] [blame] | 3267 | static void selinux_inode_getsecid(struct inode *inode, u32 *secid) |
Ahmed S. Darwish | 713a04ae | 2008-03-01 21:52:30 +0200 | [diff] [blame] | 3268 | { |
Andreas Gruenbacher | e817c2f | 2016-02-18 12:04:08 +0100 | [diff] [blame] | 3269 | struct inode_security_struct *isec = inode_security_novalidate(inode); |
Ahmed S. Darwish | 713a04ae | 2008-03-01 21:52:30 +0200 | [diff] [blame] | 3270 | *secid = isec->sid; |
| 3271 | } |
| 3272 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3273 | /* file security operations */ |
| 3274 | |
Yuichi Nakamura | 788e7dd | 2007-09-14 09:27:07 +0900 | [diff] [blame] | 3275 | static int selinux_revalidate_file_permission(struct file *file, int mask) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3276 | { |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 3277 | const struct cred *cred = current_cred(); |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 3278 | struct inode *inode = file_inode(file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3279 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3280 | /* file_mask_to_av won't add FILE__WRITE if MAY_APPEND is set */ |
| 3281 | if ((file->f_flags & O_APPEND) && (mask & MAY_WRITE)) |
| 3282 | mask |= MAY_APPEND; |
| 3283 | |
Paul Moore | 389fb800 | 2009-03-27 17:10:34 -0400 | [diff] [blame] | 3284 | return file_has_perm(cred, file, |
| 3285 | file_mask_to_av(inode->i_mode, mask)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3286 | } |
| 3287 | |
Yuichi Nakamura | 788e7dd | 2007-09-14 09:27:07 +0900 | [diff] [blame] | 3288 | static int selinux_file_permission(struct file *file, int mask) |
| 3289 | { |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 3290 | struct inode *inode = file_inode(file); |
Stephen Smalley | 20dda18 | 2009-06-22 14:54:53 -0400 | [diff] [blame] | 3291 | struct file_security_struct *fsec = file->f_security; |
Andreas Gruenbacher | b197367 | 2016-01-05 23:12:33 +0100 | [diff] [blame] | 3292 | struct inode_security_struct *isec; |
Stephen Smalley | 20dda18 | 2009-06-22 14:54:53 -0400 | [diff] [blame] | 3293 | u32 sid = current_sid(); |
| 3294 | |
Paul Moore | 389fb800 | 2009-03-27 17:10:34 -0400 | [diff] [blame] | 3295 | if (!mask) |
Yuichi Nakamura | 788e7dd | 2007-09-14 09:27:07 +0900 | [diff] [blame] | 3296 | /* No permission to check. Existence test. */ |
| 3297 | return 0; |
Yuichi Nakamura | 788e7dd | 2007-09-14 09:27:07 +0900 | [diff] [blame] | 3298 | |
Andreas Gruenbacher | b197367 | 2016-01-05 23:12:33 +0100 | [diff] [blame] | 3299 | isec = inode_security(inode); |
Stephen Smalley | 20dda18 | 2009-06-22 14:54:53 -0400 | [diff] [blame] | 3300 | if (sid == fsec->sid && fsec->isid == isec->sid && |
| 3301 | fsec->pseqno == avc_policy_seqno()) |
Eric Paris | 83d4985 | 2012-04-04 13:45:40 -0400 | [diff] [blame] | 3302 | /* No change since file_open check. */ |
Stephen Smalley | 20dda18 | 2009-06-22 14:54:53 -0400 | [diff] [blame] | 3303 | return 0; |
| 3304 | |
Yuichi Nakamura | 788e7dd | 2007-09-14 09:27:07 +0900 | [diff] [blame] | 3305 | return selinux_revalidate_file_permission(file, mask); |
| 3306 | } |
| 3307 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3308 | static int selinux_file_alloc_security(struct file *file) |
| 3309 | { |
| 3310 | return file_alloc_security(file); |
| 3311 | } |
| 3312 | |
| 3313 | static void selinux_file_free_security(struct file *file) |
| 3314 | { |
| 3315 | file_free_security(file); |
| 3316 | } |
| 3317 | |
Jeff Vander Stoep | fa1aa14 | 2015-07-10 17:19:56 -0400 | [diff] [blame] | 3318 | /* |
| 3319 | * Check whether a task has the ioctl permission and cmd |
| 3320 | * operation to an inode. |
| 3321 | */ |
Geliang Tang | 1d2a168 | 2015-10-21 17:44:27 -0400 | [diff] [blame] | 3322 | static int ioctl_has_perm(const struct cred *cred, struct file *file, |
Jeff Vander Stoep | fa1aa14 | 2015-07-10 17:19:56 -0400 | [diff] [blame] | 3323 | u32 requested, u16 cmd) |
| 3324 | { |
| 3325 | struct common_audit_data ad; |
| 3326 | struct file_security_struct *fsec = file->f_security; |
| 3327 | struct inode *inode = file_inode(file); |
Paul Moore | 20cdef8 | 2016-04-04 14:14:42 -0400 | [diff] [blame] | 3328 | struct inode_security_struct *isec; |
Jeff Vander Stoep | fa1aa14 | 2015-07-10 17:19:56 -0400 | [diff] [blame] | 3329 | struct lsm_ioctlop_audit ioctl; |
| 3330 | u32 ssid = cred_sid(cred); |
| 3331 | int rc; |
| 3332 | u8 driver = cmd >> 8; |
| 3333 | u8 xperm = cmd & 0xff; |
| 3334 | |
| 3335 | ad.type = LSM_AUDIT_DATA_IOCTL_OP; |
| 3336 | ad.u.op = &ioctl; |
| 3337 | ad.u.op->cmd = cmd; |
| 3338 | ad.u.op->path = file->f_path; |
| 3339 | |
| 3340 | if (ssid != fsec->sid) { |
| 3341 | rc = avc_has_perm(ssid, fsec->sid, |
| 3342 | SECCLASS_FD, |
| 3343 | FD__USE, |
| 3344 | &ad); |
| 3345 | if (rc) |
| 3346 | goto out; |
| 3347 | } |
| 3348 | |
| 3349 | if (unlikely(IS_PRIVATE(inode))) |
| 3350 | return 0; |
| 3351 | |
Paul Moore | 20cdef8 | 2016-04-04 14:14:42 -0400 | [diff] [blame] | 3352 | isec = inode_security(inode); |
Jeff Vander Stoep | fa1aa14 | 2015-07-10 17:19:56 -0400 | [diff] [blame] | 3353 | rc = avc_has_extended_perms(ssid, isec->sid, isec->sclass, |
| 3354 | requested, driver, xperm, &ad); |
| 3355 | out: |
| 3356 | return rc; |
| 3357 | } |
| 3358 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3359 | static int selinux_file_ioctl(struct file *file, unsigned int cmd, |
| 3360 | unsigned long arg) |
| 3361 | { |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 3362 | const struct cred *cred = current_cred(); |
Eric Paris | 0b24dcb | 2011-02-25 15:39:20 -0500 | [diff] [blame] | 3363 | int error = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3364 | |
Eric Paris | 0b24dcb | 2011-02-25 15:39:20 -0500 | [diff] [blame] | 3365 | switch (cmd) { |
| 3366 | case FIONREAD: |
| 3367 | /* fall through */ |
| 3368 | case FIBMAP: |
| 3369 | /* fall through */ |
| 3370 | case FIGETBSZ: |
| 3371 | /* fall through */ |
Al Viro | 2f99c36 | 2012-03-23 16:04:05 -0400 | [diff] [blame] | 3372 | case FS_IOC_GETFLAGS: |
Eric Paris | 0b24dcb | 2011-02-25 15:39:20 -0500 | [diff] [blame] | 3373 | /* fall through */ |
Al Viro | 2f99c36 | 2012-03-23 16:04:05 -0400 | [diff] [blame] | 3374 | case FS_IOC_GETVERSION: |
Eric Paris | 0b24dcb | 2011-02-25 15:39:20 -0500 | [diff] [blame] | 3375 | error = file_has_perm(cred, file, FILE__GETATTR); |
| 3376 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3377 | |
Al Viro | 2f99c36 | 2012-03-23 16:04:05 -0400 | [diff] [blame] | 3378 | case FS_IOC_SETFLAGS: |
Eric Paris | 0b24dcb | 2011-02-25 15:39:20 -0500 | [diff] [blame] | 3379 | /* fall through */ |
Al Viro | 2f99c36 | 2012-03-23 16:04:05 -0400 | [diff] [blame] | 3380 | case FS_IOC_SETVERSION: |
Eric Paris | 0b24dcb | 2011-02-25 15:39:20 -0500 | [diff] [blame] | 3381 | error = file_has_perm(cred, file, FILE__SETATTR); |
| 3382 | break; |
| 3383 | |
| 3384 | /* sys_ioctl() checks */ |
| 3385 | case FIONBIO: |
| 3386 | /* fall through */ |
| 3387 | case FIOASYNC: |
| 3388 | error = file_has_perm(cred, file, 0); |
| 3389 | break; |
| 3390 | |
| 3391 | case KDSKBENT: |
| 3392 | case KDSKBSENT: |
Eric Paris | 6a9de49 | 2012-01-03 12:25:14 -0500 | [diff] [blame] | 3393 | error = cred_has_capability(cred, CAP_SYS_TTY_CONFIG, |
Stephen Smalley | 8e4ff6f | 2016-04-08 13:52:00 -0400 | [diff] [blame] | 3394 | SECURITY_CAP_AUDIT, true); |
Eric Paris | 0b24dcb | 2011-02-25 15:39:20 -0500 | [diff] [blame] | 3395 | break; |
| 3396 | |
| 3397 | /* default case assumes that the command will go |
| 3398 | * to the file's ioctl() function. |
| 3399 | */ |
| 3400 | default: |
Jeff Vander Stoep | fa1aa14 | 2015-07-10 17:19:56 -0400 | [diff] [blame] | 3401 | error = ioctl_has_perm(cred, file, FILE__IOCTL, (u16) cmd); |
Eric Paris | 0b24dcb | 2011-02-25 15:39:20 -0500 | [diff] [blame] | 3402 | } |
| 3403 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3404 | } |
| 3405 | |
Stephen Smalley | fcaaade | 2010-04-28 15:57:57 -0400 | [diff] [blame] | 3406 | static int default_noexec; |
| 3407 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3408 | static int file_map_prot_check(struct file *file, unsigned long prot, int shared) |
| 3409 | { |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 3410 | const struct cred *cred = current_cred(); |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 3411 | int rc = 0; |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 3412 | |
Stephen Smalley | fcaaade | 2010-04-28 15:57:57 -0400 | [diff] [blame] | 3413 | if (default_noexec && |
Stephen Smalley | 892e8ca | 2015-07-10 09:40:59 -0400 | [diff] [blame] | 3414 | (prot & PROT_EXEC) && (!file || IS_PRIVATE(file_inode(file)) || |
| 3415 | (!shared && (prot & PROT_WRITE)))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3416 | /* |
| 3417 | * We are making executable an anonymous mapping or a |
| 3418 | * private file mapping that will also be writable. |
| 3419 | * This has an additional check. |
| 3420 | */ |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 3421 | rc = cred_has_perm(cred, cred, PROCESS__EXECMEM); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3422 | if (rc) |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 3423 | goto error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3424 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3425 | |
| 3426 | if (file) { |
| 3427 | /* read access is always possible with a mapping */ |
| 3428 | u32 av = FILE__READ; |
| 3429 | |
| 3430 | /* write access only matters if the mapping is shared */ |
| 3431 | if (shared && (prot & PROT_WRITE)) |
| 3432 | av |= FILE__WRITE; |
| 3433 | |
| 3434 | if (prot & PROT_EXEC) |
| 3435 | av |= FILE__EXECUTE; |
| 3436 | |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 3437 | return file_has_perm(cred, file, av); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3438 | } |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 3439 | |
| 3440 | error: |
| 3441 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3442 | } |
| 3443 | |
Al Viro | e546785 | 2012-05-30 13:30:51 -0400 | [diff] [blame] | 3444 | static int selinux_mmap_addr(unsigned long addr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3445 | { |
Casey Schaufler | b1d9e6b | 2015-05-02 15:11:42 -0700 | [diff] [blame] | 3446 | int rc = 0; |
Paul Moore | 98883bf | 2014-03-19 16:46:11 -0400 | [diff] [blame] | 3447 | |
| 3448 | if (addr < CONFIG_LSM_MMAP_MIN_ADDR) { |
| 3449 | u32 sid = current_sid(); |
| 3450 | rc = avc_has_perm(sid, sid, SECCLASS_MEMPROTECT, |
| 3451 | MEMPROTECT__MMAP_ZERO, NULL); |
| 3452 | } |
| 3453 | |
| 3454 | return rc; |
Al Viro | e546785 | 2012-05-30 13:30:51 -0400 | [diff] [blame] | 3455 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3456 | |
Al Viro | e546785 | 2012-05-30 13:30:51 -0400 | [diff] [blame] | 3457 | static int selinux_mmap_file(struct file *file, unsigned long reqprot, |
| 3458 | unsigned long prot, unsigned long flags) |
| 3459 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3460 | if (selinux_checkreqprot) |
| 3461 | prot = reqprot; |
| 3462 | |
| 3463 | return file_map_prot_check(file, prot, |
| 3464 | (flags & MAP_TYPE) == MAP_SHARED); |
| 3465 | } |
| 3466 | |
| 3467 | static int selinux_file_mprotect(struct vm_area_struct *vma, |
| 3468 | unsigned long reqprot, |
| 3469 | unsigned long prot) |
| 3470 | { |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 3471 | const struct cred *cred = current_cred(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3472 | |
| 3473 | if (selinux_checkreqprot) |
| 3474 | prot = reqprot; |
| 3475 | |
Stephen Smalley | fcaaade | 2010-04-28 15:57:57 -0400 | [diff] [blame] | 3476 | if (default_noexec && |
| 3477 | (prot & PROT_EXEC) && !(vma->vm_flags & VM_EXEC)) { |
James Morris | d541bbe | 2009-01-29 12:19:51 +1100 | [diff] [blame] | 3478 | int rc = 0; |
Stephen Smalley | db4c964 | 2006-02-01 03:05:54 -0800 | [diff] [blame] | 3479 | if (vma->vm_start >= vma->vm_mm->start_brk && |
| 3480 | vma->vm_end <= vma->vm_mm->brk) { |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 3481 | rc = cred_has_perm(cred, cred, PROCESS__EXECHEAP); |
Stephen Smalley | db4c964 | 2006-02-01 03:05:54 -0800 | [diff] [blame] | 3482 | } else if (!vma->vm_file && |
Stephen Smalley | c2316dbf | 2016-04-08 13:55:03 -0400 | [diff] [blame] | 3483 | ((vma->vm_start <= vma->vm_mm->start_stack && |
| 3484 | vma->vm_end >= vma->vm_mm->start_stack) || |
| 3485 | vma_is_stack_for_task(vma, current))) { |
David Howells | 3b11a1d | 2008-11-14 10:39:26 +1100 | [diff] [blame] | 3486 | rc = current_has_perm(current, PROCESS__EXECSTACK); |
Stephen Smalley | db4c964 | 2006-02-01 03:05:54 -0800 | [diff] [blame] | 3487 | } else if (vma->vm_file && vma->anon_vma) { |
| 3488 | /* |
| 3489 | * We are making executable a file mapping that has |
| 3490 | * had some COW done. Since pages might have been |
| 3491 | * written, check ability to execute the possibly |
| 3492 | * modified content. This typically should only |
| 3493 | * occur for text relocations. |
| 3494 | */ |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 3495 | rc = file_has_perm(cred, vma->vm_file, FILE__EXECMOD); |
Stephen Smalley | db4c964 | 2006-02-01 03:05:54 -0800 | [diff] [blame] | 3496 | } |
Lorenzo Hernandez GarcÃa-Hierro | 6b99219 | 2005-06-25 14:54:34 -0700 | [diff] [blame] | 3497 | if (rc) |
| 3498 | return rc; |
| 3499 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3500 | |
| 3501 | return file_map_prot_check(vma->vm_file, prot, vma->vm_flags&VM_SHARED); |
| 3502 | } |
| 3503 | |
| 3504 | static int selinux_file_lock(struct file *file, unsigned int cmd) |
| 3505 | { |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 3506 | const struct cred *cred = current_cred(); |
| 3507 | |
| 3508 | return file_has_perm(cred, file, FILE__LOCK); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3509 | } |
| 3510 | |
| 3511 | static int selinux_file_fcntl(struct file *file, unsigned int cmd, |
| 3512 | unsigned long arg) |
| 3513 | { |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 3514 | const struct cred *cred = current_cred(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3515 | int err = 0; |
| 3516 | |
| 3517 | switch (cmd) { |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3518 | case F_SETFL: |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3519 | if ((file->f_flags & O_APPEND) && !(arg & O_APPEND)) { |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 3520 | err = file_has_perm(cred, file, FILE__WRITE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3521 | break; |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3522 | } |
| 3523 | /* fall through */ |
| 3524 | case F_SETOWN: |
| 3525 | case F_SETSIG: |
| 3526 | case F_GETFL: |
| 3527 | case F_GETOWN: |
| 3528 | case F_GETSIG: |
Cyrill Gorcunov | 1d151c3 | 2012-07-30 14:43:00 -0700 | [diff] [blame] | 3529 | case F_GETOWNER_UIDS: |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3530 | /* Just check FD__USE permission */ |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 3531 | err = file_has_perm(cred, file, 0); |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3532 | break; |
| 3533 | case F_GETLK: |
| 3534 | case F_SETLK: |
| 3535 | case F_SETLKW: |
Jeff Layton | 0d3f7a2 | 2014-04-22 08:23:58 -0400 | [diff] [blame] | 3536 | case F_OFD_GETLK: |
| 3537 | case F_OFD_SETLK: |
| 3538 | case F_OFD_SETLKW: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3539 | #if BITS_PER_LONG == 32 |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3540 | case F_GETLK64: |
| 3541 | case F_SETLK64: |
| 3542 | case F_SETLKW64: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3543 | #endif |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 3544 | err = file_has_perm(cred, file, FILE__LOCK); |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3545 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3546 | } |
| 3547 | |
| 3548 | return err; |
| 3549 | } |
| 3550 | |
Jeff Layton | e0b93ed | 2014-08-22 11:27:32 -0400 | [diff] [blame] | 3551 | static void selinux_file_set_fowner(struct file *file) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3552 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3553 | struct file_security_struct *fsec; |
| 3554 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3555 | fsec = file->f_security; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 3556 | fsec->fown_sid = current_sid(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3557 | } |
| 3558 | |
| 3559 | static int selinux_file_send_sigiotask(struct task_struct *tsk, |
| 3560 | struct fown_struct *fown, int signum) |
| 3561 | { |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3562 | struct file *file; |
Stephen Smalley | 65c90bc | 2009-05-04 15:43:18 -0400 | [diff] [blame] | 3563 | u32 sid = task_sid(tsk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3564 | u32 perm; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3565 | struct file_security_struct *fsec; |
| 3566 | |
| 3567 | /* struct fown_struct is never outside the context of a struct file */ |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3568 | file = container_of(fown, struct file, f_owner); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3569 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3570 | fsec = file->f_security; |
| 3571 | |
| 3572 | if (!signum) |
| 3573 | perm = signal_to_av(SIGIO); /* as per send_sigio_to_task */ |
| 3574 | else |
| 3575 | perm = signal_to_av(signum); |
| 3576 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 3577 | return avc_has_perm(fsec->fown_sid, sid, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3578 | SECCLASS_PROCESS, perm, NULL); |
| 3579 | } |
| 3580 | |
| 3581 | static int selinux_file_receive(struct file *file) |
| 3582 | { |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 3583 | const struct cred *cred = current_cred(); |
| 3584 | |
| 3585 | return file_has_perm(cred, file, file_to_av(file)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3586 | } |
| 3587 | |
Eric Paris | 83d4985 | 2012-04-04 13:45:40 -0400 | [diff] [blame] | 3588 | static int selinux_file_open(struct file *file, const struct cred *cred) |
Yuichi Nakamura | 788e7dd | 2007-09-14 09:27:07 +0900 | [diff] [blame] | 3589 | { |
| 3590 | struct file_security_struct *fsec; |
Yuichi Nakamura | 788e7dd | 2007-09-14 09:27:07 +0900 | [diff] [blame] | 3591 | struct inode_security_struct *isec; |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 3592 | |
Yuichi Nakamura | 788e7dd | 2007-09-14 09:27:07 +0900 | [diff] [blame] | 3593 | fsec = file->f_security; |
Andreas Gruenbacher | 83da53c5 | 2015-12-24 11:09:39 -0500 | [diff] [blame] | 3594 | isec = inode_security(file_inode(file)); |
Yuichi Nakamura | 788e7dd | 2007-09-14 09:27:07 +0900 | [diff] [blame] | 3595 | /* |
| 3596 | * Save inode label and policy sequence number |
| 3597 | * at open-time so that selinux_file_permission |
| 3598 | * can determine whether revalidation is necessary. |
| 3599 | * Task label is already saved in the file security |
| 3600 | * struct as its SID. |
| 3601 | */ |
| 3602 | fsec->isid = isec->sid; |
| 3603 | fsec->pseqno = avc_policy_seqno(); |
| 3604 | /* |
| 3605 | * Since the inode label or policy seqno may have changed |
| 3606 | * between the selinux_inode_permission check and the saving |
| 3607 | * of state above, recheck that access is still permitted. |
| 3608 | * Otherwise, access might never be revalidated against the |
| 3609 | * new inode label or new policy. |
| 3610 | * This check is not redundant - do not remove. |
| 3611 | */ |
David Howells | 13f8e98 | 2013-06-13 23:37:55 +0100 | [diff] [blame] | 3612 | return file_path_has_perm(cred, file, open_file_to_av(file)); |
Yuichi Nakamura | 788e7dd | 2007-09-14 09:27:07 +0900 | [diff] [blame] | 3613 | } |
| 3614 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3615 | /* task security operations */ |
| 3616 | |
| 3617 | static int selinux_task_create(unsigned long clone_flags) |
| 3618 | { |
David Howells | 3b11a1d | 2008-11-14 10:39:26 +1100 | [diff] [blame] | 3619 | return current_has_perm(current, PROCESS__FORK); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3620 | } |
| 3621 | |
David Howells | f1752ee | 2008-11-14 10:39:17 +1100 | [diff] [blame] | 3622 | /* |
David Howells | ee18d64 | 2009-09-02 09:14:21 +0100 | [diff] [blame] | 3623 | * allocate the SELinux part of blank credentials |
| 3624 | */ |
| 3625 | static int selinux_cred_alloc_blank(struct cred *cred, gfp_t gfp) |
| 3626 | { |
| 3627 | struct task_security_struct *tsec; |
| 3628 | |
| 3629 | tsec = kzalloc(sizeof(struct task_security_struct), gfp); |
| 3630 | if (!tsec) |
| 3631 | return -ENOMEM; |
| 3632 | |
| 3633 | cred->security = tsec; |
| 3634 | return 0; |
| 3635 | } |
| 3636 | |
| 3637 | /* |
David Howells | f1752ee | 2008-11-14 10:39:17 +1100 | [diff] [blame] | 3638 | * detach and free the LSM part of a set of credentials |
| 3639 | */ |
| 3640 | static void selinux_cred_free(struct cred *cred) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3641 | { |
David Howells | f1752ee | 2008-11-14 10:39:17 +1100 | [diff] [blame] | 3642 | struct task_security_struct *tsec = cred->security; |
David Howells | e0e8173 | 2009-09-02 09:13:40 +0100 | [diff] [blame] | 3643 | |
Tetsuo Handa | 2edeaa3 | 2011-02-07 13:36:10 +0000 | [diff] [blame] | 3644 | /* |
| 3645 | * cred->security == NULL if security_cred_alloc_blank() or |
| 3646 | * security_prepare_creds() returned an error. |
| 3647 | */ |
| 3648 | BUG_ON(cred->security && (unsigned long) cred->security < PAGE_SIZE); |
David Howells | e0e8173 | 2009-09-02 09:13:40 +0100 | [diff] [blame] | 3649 | cred->security = (void *) 0x7UL; |
David Howells | f1752ee | 2008-11-14 10:39:17 +1100 | [diff] [blame] | 3650 | kfree(tsec); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3651 | } |
| 3652 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 3653 | /* |
| 3654 | * prepare a new set of credentials for modification |
| 3655 | */ |
| 3656 | static int selinux_cred_prepare(struct cred *new, const struct cred *old, |
| 3657 | gfp_t gfp) |
| 3658 | { |
| 3659 | const struct task_security_struct *old_tsec; |
| 3660 | struct task_security_struct *tsec; |
| 3661 | |
| 3662 | old_tsec = old->security; |
| 3663 | |
| 3664 | tsec = kmemdup(old_tsec, sizeof(struct task_security_struct), gfp); |
| 3665 | if (!tsec) |
| 3666 | return -ENOMEM; |
| 3667 | |
| 3668 | new->security = tsec; |
| 3669 | return 0; |
| 3670 | } |
| 3671 | |
| 3672 | /* |
David Howells | ee18d64 | 2009-09-02 09:14:21 +0100 | [diff] [blame] | 3673 | * transfer the SELinux data to a blank set of creds |
| 3674 | */ |
| 3675 | static void selinux_cred_transfer(struct cred *new, const struct cred *old) |
| 3676 | { |
| 3677 | const struct task_security_struct *old_tsec = old->security; |
| 3678 | struct task_security_struct *tsec = new->security; |
| 3679 | |
| 3680 | *tsec = *old_tsec; |
| 3681 | } |
| 3682 | |
| 3683 | /* |
David Howells | 3a3b7ce | 2008-11-14 10:39:28 +1100 | [diff] [blame] | 3684 | * set the security data for a kernel service |
| 3685 | * - all the creation contexts are set to unlabelled |
| 3686 | */ |
| 3687 | static int selinux_kernel_act_as(struct cred *new, u32 secid) |
| 3688 | { |
| 3689 | struct task_security_struct *tsec = new->security; |
| 3690 | u32 sid = current_sid(); |
| 3691 | int ret; |
| 3692 | |
| 3693 | ret = avc_has_perm(sid, secid, |
| 3694 | SECCLASS_KERNEL_SERVICE, |
| 3695 | KERNEL_SERVICE__USE_AS_OVERRIDE, |
| 3696 | NULL); |
| 3697 | if (ret == 0) { |
| 3698 | tsec->sid = secid; |
| 3699 | tsec->create_sid = 0; |
| 3700 | tsec->keycreate_sid = 0; |
| 3701 | tsec->sockcreate_sid = 0; |
| 3702 | } |
| 3703 | return ret; |
| 3704 | } |
| 3705 | |
| 3706 | /* |
| 3707 | * set the file creation context in a security record to the same as the |
| 3708 | * objective context of the specified inode |
| 3709 | */ |
| 3710 | static int selinux_kernel_create_files_as(struct cred *new, struct inode *inode) |
| 3711 | { |
Andreas Gruenbacher | 83da53c5 | 2015-12-24 11:09:39 -0500 | [diff] [blame] | 3712 | struct inode_security_struct *isec = inode_security(inode); |
David Howells | 3a3b7ce | 2008-11-14 10:39:28 +1100 | [diff] [blame] | 3713 | struct task_security_struct *tsec = new->security; |
| 3714 | u32 sid = current_sid(); |
| 3715 | int ret; |
| 3716 | |
| 3717 | ret = avc_has_perm(sid, isec->sid, |
| 3718 | SECCLASS_KERNEL_SERVICE, |
| 3719 | KERNEL_SERVICE__CREATE_FILES_AS, |
| 3720 | NULL); |
| 3721 | |
| 3722 | if (ret == 0) |
| 3723 | tsec->create_sid = isec->sid; |
David Howells | ef57471 | 2010-02-26 01:56:16 +0000 | [diff] [blame] | 3724 | return ret; |
David Howells | 3a3b7ce | 2008-11-14 10:39:28 +1100 | [diff] [blame] | 3725 | } |
| 3726 | |
Eric Paris | dd8dbf2 | 2009-11-03 16:35:32 +1100 | [diff] [blame] | 3727 | static int selinux_kernel_module_request(char *kmod_name) |
Eric Paris | 25354c4 | 2009-08-13 09:45:03 -0400 | [diff] [blame] | 3728 | { |
Eric Paris | dd8dbf2 | 2009-11-03 16:35:32 +1100 | [diff] [blame] | 3729 | u32 sid; |
| 3730 | struct common_audit_data ad; |
| 3731 | |
| 3732 | sid = task_sid(current); |
| 3733 | |
Eric Paris | 50c205f | 2012-04-04 15:01:43 -0400 | [diff] [blame] | 3734 | ad.type = LSM_AUDIT_DATA_KMOD; |
Eric Paris | dd8dbf2 | 2009-11-03 16:35:32 +1100 | [diff] [blame] | 3735 | ad.u.kmod_name = kmod_name; |
| 3736 | |
| 3737 | return avc_has_perm(sid, SECINITSID_KERNEL, SECCLASS_SYSTEM, |
| 3738 | SYSTEM__MODULE_REQUEST, &ad); |
Eric Paris | 25354c4 | 2009-08-13 09:45:03 -0400 | [diff] [blame] | 3739 | } |
| 3740 | |
Jeff Vander Stoep | 61d612e | 2016-04-05 13:06:27 -0700 | [diff] [blame] | 3741 | static int selinux_kernel_module_from_file(struct file *file) |
| 3742 | { |
| 3743 | struct common_audit_data ad; |
| 3744 | struct inode_security_struct *isec; |
| 3745 | struct file_security_struct *fsec; |
| 3746 | u32 sid = current_sid(); |
| 3747 | int rc; |
| 3748 | |
| 3749 | /* init_module */ |
| 3750 | if (file == NULL) |
| 3751 | return avc_has_perm(sid, sid, SECCLASS_SYSTEM, |
| 3752 | SYSTEM__MODULE_LOAD, NULL); |
| 3753 | |
| 3754 | /* finit_module */ |
Paul Moore | 20cdef8 | 2016-04-04 14:14:42 -0400 | [diff] [blame] | 3755 | |
Jeff Vander Stoep | 61d612e | 2016-04-05 13:06:27 -0700 | [diff] [blame] | 3756 | ad.type = LSM_AUDIT_DATA_PATH; |
| 3757 | ad.u.path = file->f_path; |
| 3758 | |
Jeff Vander Stoep | 61d612e | 2016-04-05 13:06:27 -0700 | [diff] [blame] | 3759 | fsec = file->f_security; |
Jeff Vander Stoep | 61d612e | 2016-04-05 13:06:27 -0700 | [diff] [blame] | 3760 | if (sid != fsec->sid) { |
| 3761 | rc = avc_has_perm(sid, fsec->sid, SECCLASS_FD, FD__USE, &ad); |
| 3762 | if (rc) |
| 3763 | return rc; |
| 3764 | } |
| 3765 | |
Paul Moore | 20cdef8 | 2016-04-04 14:14:42 -0400 | [diff] [blame] | 3766 | isec = inode_security(file_inode(file)); |
Jeff Vander Stoep | 61d612e | 2016-04-05 13:06:27 -0700 | [diff] [blame] | 3767 | return avc_has_perm(sid, isec->sid, SECCLASS_SYSTEM, |
| 3768 | SYSTEM__MODULE_LOAD, &ad); |
| 3769 | } |
| 3770 | |
| 3771 | static int selinux_kernel_read_file(struct file *file, |
| 3772 | enum kernel_read_file_id id) |
| 3773 | { |
| 3774 | int rc = 0; |
| 3775 | |
| 3776 | switch (id) { |
| 3777 | case READING_MODULE: |
| 3778 | rc = selinux_kernel_module_from_file(file); |
| 3779 | break; |
| 3780 | default: |
| 3781 | break; |
| 3782 | } |
| 3783 | |
| 3784 | return rc; |
| 3785 | } |
| 3786 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3787 | static int selinux_task_setpgid(struct task_struct *p, pid_t pgid) |
| 3788 | { |
David Howells | 3b11a1d | 2008-11-14 10:39:26 +1100 | [diff] [blame] | 3789 | return current_has_perm(p, PROCESS__SETPGID); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3790 | } |
| 3791 | |
| 3792 | static int selinux_task_getpgid(struct task_struct *p) |
| 3793 | { |
David Howells | 3b11a1d | 2008-11-14 10:39:26 +1100 | [diff] [blame] | 3794 | return current_has_perm(p, PROCESS__GETPGID); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3795 | } |
| 3796 | |
| 3797 | static int selinux_task_getsid(struct task_struct *p) |
| 3798 | { |
David Howells | 3b11a1d | 2008-11-14 10:39:26 +1100 | [diff] [blame] | 3799 | return current_has_perm(p, PROCESS__GETSESSION); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3800 | } |
| 3801 | |
David Quigley | f9008e4 | 2006-06-30 01:55:46 -0700 | [diff] [blame] | 3802 | static void selinux_task_getsecid(struct task_struct *p, u32 *secid) |
| 3803 | { |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 3804 | *secid = task_sid(p); |
David Quigley | f9008e4 | 2006-06-30 01:55:46 -0700 | [diff] [blame] | 3805 | } |
| 3806 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3807 | static int selinux_task_setnice(struct task_struct *p, int nice) |
| 3808 | { |
David Howells | 3b11a1d | 2008-11-14 10:39:26 +1100 | [diff] [blame] | 3809 | return current_has_perm(p, PROCESS__SETSCHED); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3810 | } |
| 3811 | |
James Morris | 03e6806 | 2006-06-23 02:03:58 -0700 | [diff] [blame] | 3812 | static int selinux_task_setioprio(struct task_struct *p, int ioprio) |
| 3813 | { |
David Howells | 3b11a1d | 2008-11-14 10:39:26 +1100 | [diff] [blame] | 3814 | return current_has_perm(p, PROCESS__SETSCHED); |
James Morris | 03e6806 | 2006-06-23 02:03:58 -0700 | [diff] [blame] | 3815 | } |
| 3816 | |
David Quigley | a1836a4 | 2006-06-30 01:55:49 -0700 | [diff] [blame] | 3817 | static int selinux_task_getioprio(struct task_struct *p) |
| 3818 | { |
David Howells | 3b11a1d | 2008-11-14 10:39:26 +1100 | [diff] [blame] | 3819 | return current_has_perm(p, PROCESS__GETSCHED); |
David Quigley | a1836a4 | 2006-06-30 01:55:49 -0700 | [diff] [blame] | 3820 | } |
| 3821 | |
Jiri Slaby | 8fd00b4 | 2009-08-26 18:41:16 +0200 | [diff] [blame] | 3822 | static int selinux_task_setrlimit(struct task_struct *p, unsigned int resource, |
| 3823 | struct rlimit *new_rlim) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3824 | { |
Jiri Slaby | 8fd00b4 | 2009-08-26 18:41:16 +0200 | [diff] [blame] | 3825 | struct rlimit *old_rlim = p->signal->rlim + resource; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3826 | |
| 3827 | /* Control the ability to change the hard limit (whether |
| 3828 | lowering or raising it), so that the hard limit can |
| 3829 | later be used as a safe reset point for the soft limit |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 3830 | upon context transitions. See selinux_bprm_committing_creds. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3831 | if (old_rlim->rlim_max != new_rlim->rlim_max) |
Jiri Slaby | 8fd00b4 | 2009-08-26 18:41:16 +0200 | [diff] [blame] | 3832 | return current_has_perm(p, PROCESS__SETRLIMIT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3833 | |
| 3834 | return 0; |
| 3835 | } |
| 3836 | |
KOSAKI Motohiro | b0ae198 | 2010-10-15 04:21:18 +0900 | [diff] [blame] | 3837 | static int selinux_task_setscheduler(struct task_struct *p) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3838 | { |
David Howells | 3b11a1d | 2008-11-14 10:39:26 +1100 | [diff] [blame] | 3839 | return current_has_perm(p, PROCESS__SETSCHED); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3840 | } |
| 3841 | |
| 3842 | static int selinux_task_getscheduler(struct task_struct *p) |
| 3843 | { |
David Howells | 3b11a1d | 2008-11-14 10:39:26 +1100 | [diff] [blame] | 3844 | return current_has_perm(p, PROCESS__GETSCHED); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3845 | } |
| 3846 | |
David Quigley | 3560154 | 2006-06-23 02:04:01 -0700 | [diff] [blame] | 3847 | static int selinux_task_movememory(struct task_struct *p) |
| 3848 | { |
David Howells | 3b11a1d | 2008-11-14 10:39:26 +1100 | [diff] [blame] | 3849 | return current_has_perm(p, PROCESS__SETSCHED); |
David Quigley | 3560154 | 2006-06-23 02:04:01 -0700 | [diff] [blame] | 3850 | } |
| 3851 | |
David Quigley | f9008e4 | 2006-06-30 01:55:46 -0700 | [diff] [blame] | 3852 | static int selinux_task_kill(struct task_struct *p, struct siginfo *info, |
| 3853 | int sig, u32 secid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3854 | { |
| 3855 | u32 perm; |
| 3856 | int rc; |
| 3857 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3858 | if (!sig) |
| 3859 | perm = PROCESS__SIGNULL; /* null signal; existence test */ |
| 3860 | else |
| 3861 | perm = signal_to_av(sig); |
David Quigley | f9008e4 | 2006-06-30 01:55:46 -0700 | [diff] [blame] | 3862 | if (secid) |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 3863 | rc = avc_has_perm(secid, task_sid(p), |
| 3864 | SECCLASS_PROCESS, perm, NULL); |
David Quigley | f9008e4 | 2006-06-30 01:55:46 -0700 | [diff] [blame] | 3865 | else |
David Howells | 3b11a1d | 2008-11-14 10:39:26 +1100 | [diff] [blame] | 3866 | rc = current_has_perm(p, perm); |
David Quigley | f9008e4 | 2006-06-30 01:55:46 -0700 | [diff] [blame] | 3867 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3868 | } |
| 3869 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3870 | static int selinux_task_wait(struct task_struct *p) |
| 3871 | { |
Eric Paris | 8a53514 | 2007-10-22 16:10:31 -0400 | [diff] [blame] | 3872 | return task_has_perm(p, current, PROCESS__SIGCHLD); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3873 | } |
| 3874 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3875 | static void selinux_task_to_inode(struct task_struct *p, |
| 3876 | struct inode *inode) |
| 3877 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3878 | struct inode_security_struct *isec = inode->i_security; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 3879 | u32 sid = task_sid(p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3880 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 3881 | isec->sid = sid; |
Andreas Gruenbacher | 6f3be9f | 2015-12-24 11:09:40 -0500 | [diff] [blame] | 3882 | isec->initialized = LABEL_INITIALIZED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3883 | } |
| 3884 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3885 | /* Returns error only if unable to parse addresses */ |
Venkat Yekkirala | 67f83cb | 2006-11-08 17:04:26 -0600 | [diff] [blame] | 3886 | static int selinux_parse_skb_ipv4(struct sk_buff *skb, |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 3887 | struct common_audit_data *ad, u8 *proto) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3888 | { |
| 3889 | int offset, ihlen, ret = -EINVAL; |
| 3890 | struct iphdr _iph, *ih; |
| 3891 | |
Arnaldo Carvalho de Melo | bbe735e | 2007-03-10 22:16:10 -0300 | [diff] [blame] | 3892 | offset = skb_network_offset(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3893 | ih = skb_header_pointer(skb, offset, sizeof(_iph), &_iph); |
| 3894 | if (ih == NULL) |
| 3895 | goto out; |
| 3896 | |
| 3897 | ihlen = ih->ihl * 4; |
| 3898 | if (ihlen < sizeof(_iph)) |
| 3899 | goto out; |
| 3900 | |
Eric Paris | 48c62af | 2012-04-02 13:15:44 -0400 | [diff] [blame] | 3901 | ad->u.net->v4info.saddr = ih->saddr; |
| 3902 | ad->u.net->v4info.daddr = ih->daddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3903 | ret = 0; |
| 3904 | |
Venkat Yekkirala | 67f83cb | 2006-11-08 17:04:26 -0600 | [diff] [blame] | 3905 | if (proto) |
| 3906 | *proto = ih->protocol; |
| 3907 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3908 | switch (ih->protocol) { |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3909 | case IPPROTO_TCP: { |
| 3910 | struct tcphdr _tcph, *th; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3911 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3912 | if (ntohs(ih->frag_off) & IP_OFFSET) |
| 3913 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3914 | |
| 3915 | offset += ihlen; |
| 3916 | th = skb_header_pointer(skb, offset, sizeof(_tcph), &_tcph); |
| 3917 | if (th == NULL) |
| 3918 | break; |
| 3919 | |
Eric Paris | 48c62af | 2012-04-02 13:15:44 -0400 | [diff] [blame] | 3920 | ad->u.net->sport = th->source; |
| 3921 | ad->u.net->dport = th->dest; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3922 | break; |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3923 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3924 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3925 | case IPPROTO_UDP: { |
| 3926 | struct udphdr _udph, *uh; |
| 3927 | |
| 3928 | if (ntohs(ih->frag_off) & IP_OFFSET) |
| 3929 | break; |
| 3930 | |
| 3931 | offset += ihlen; |
| 3932 | uh = skb_header_pointer(skb, offset, sizeof(_udph), &_udph); |
| 3933 | if (uh == NULL) |
| 3934 | break; |
| 3935 | |
Eric Paris | 48c62af | 2012-04-02 13:15:44 -0400 | [diff] [blame] | 3936 | ad->u.net->sport = uh->source; |
| 3937 | ad->u.net->dport = uh->dest; |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3938 | break; |
| 3939 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3940 | |
James Morris | 2ee92d4 | 2006-11-13 16:09:01 -0800 | [diff] [blame] | 3941 | case IPPROTO_DCCP: { |
| 3942 | struct dccp_hdr _dccph, *dh; |
| 3943 | |
| 3944 | if (ntohs(ih->frag_off) & IP_OFFSET) |
| 3945 | break; |
| 3946 | |
| 3947 | offset += ihlen; |
| 3948 | dh = skb_header_pointer(skb, offset, sizeof(_dccph), &_dccph); |
| 3949 | if (dh == NULL) |
| 3950 | break; |
| 3951 | |
Eric Paris | 48c62af | 2012-04-02 13:15:44 -0400 | [diff] [blame] | 3952 | ad->u.net->sport = dh->dccph_sport; |
| 3953 | ad->u.net->dport = dh->dccph_dport; |
James Morris | 2ee92d4 | 2006-11-13 16:09:01 -0800 | [diff] [blame] | 3954 | break; |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3955 | } |
James Morris | 2ee92d4 | 2006-11-13 16:09:01 -0800 | [diff] [blame] | 3956 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3957 | default: |
| 3958 | break; |
| 3959 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3960 | out: |
| 3961 | return ret; |
| 3962 | } |
| 3963 | |
| 3964 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
| 3965 | |
| 3966 | /* Returns error only if unable to parse addresses */ |
Venkat Yekkirala | 67f83cb | 2006-11-08 17:04:26 -0600 | [diff] [blame] | 3967 | static int selinux_parse_skb_ipv6(struct sk_buff *skb, |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 3968 | struct common_audit_data *ad, u8 *proto) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3969 | { |
| 3970 | u8 nexthdr; |
| 3971 | int ret = -EINVAL, offset; |
| 3972 | struct ipv6hdr _ipv6h, *ip6; |
Jesse Gross | 75f2811 | 2011-11-30 17:05:51 -0800 | [diff] [blame] | 3973 | __be16 frag_off; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3974 | |
Arnaldo Carvalho de Melo | bbe735e | 2007-03-10 22:16:10 -0300 | [diff] [blame] | 3975 | offset = skb_network_offset(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3976 | ip6 = skb_header_pointer(skb, offset, sizeof(_ipv6h), &_ipv6h); |
| 3977 | if (ip6 == NULL) |
| 3978 | goto out; |
| 3979 | |
Eric Paris | 48c62af | 2012-04-02 13:15:44 -0400 | [diff] [blame] | 3980 | ad->u.net->v6info.saddr = ip6->saddr; |
| 3981 | ad->u.net->v6info.daddr = ip6->daddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3982 | ret = 0; |
| 3983 | |
| 3984 | nexthdr = ip6->nexthdr; |
| 3985 | offset += sizeof(_ipv6h); |
Jesse Gross | 75f2811 | 2011-11-30 17:05:51 -0800 | [diff] [blame] | 3986 | offset = ipv6_skip_exthdr(skb, offset, &nexthdr, &frag_off); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3987 | if (offset < 0) |
| 3988 | goto out; |
| 3989 | |
Venkat Yekkirala | 67f83cb | 2006-11-08 17:04:26 -0600 | [diff] [blame] | 3990 | if (proto) |
| 3991 | *proto = nexthdr; |
| 3992 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3993 | switch (nexthdr) { |
| 3994 | case IPPROTO_TCP: { |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3995 | struct tcphdr _tcph, *th; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3996 | |
| 3997 | th = skb_header_pointer(skb, offset, sizeof(_tcph), &_tcph); |
| 3998 | if (th == NULL) |
| 3999 | break; |
| 4000 | |
Eric Paris | 48c62af | 2012-04-02 13:15:44 -0400 | [diff] [blame] | 4001 | ad->u.net->sport = th->source; |
| 4002 | ad->u.net->dport = th->dest; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4003 | break; |
| 4004 | } |
| 4005 | |
| 4006 | case IPPROTO_UDP: { |
| 4007 | struct udphdr _udph, *uh; |
| 4008 | |
| 4009 | uh = skb_header_pointer(skb, offset, sizeof(_udph), &_udph); |
| 4010 | if (uh == NULL) |
| 4011 | break; |
| 4012 | |
Eric Paris | 48c62af | 2012-04-02 13:15:44 -0400 | [diff] [blame] | 4013 | ad->u.net->sport = uh->source; |
| 4014 | ad->u.net->dport = uh->dest; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4015 | break; |
| 4016 | } |
| 4017 | |
James Morris | 2ee92d4 | 2006-11-13 16:09:01 -0800 | [diff] [blame] | 4018 | case IPPROTO_DCCP: { |
| 4019 | struct dccp_hdr _dccph, *dh; |
| 4020 | |
| 4021 | dh = skb_header_pointer(skb, offset, sizeof(_dccph), &_dccph); |
| 4022 | if (dh == NULL) |
| 4023 | break; |
| 4024 | |
Eric Paris | 48c62af | 2012-04-02 13:15:44 -0400 | [diff] [blame] | 4025 | ad->u.net->sport = dh->dccph_sport; |
| 4026 | ad->u.net->dport = dh->dccph_dport; |
James Morris | 2ee92d4 | 2006-11-13 16:09:01 -0800 | [diff] [blame] | 4027 | break; |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 4028 | } |
James Morris | 2ee92d4 | 2006-11-13 16:09:01 -0800 | [diff] [blame] | 4029 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4030 | /* includes fragments */ |
| 4031 | default: |
| 4032 | break; |
| 4033 | } |
| 4034 | out: |
| 4035 | return ret; |
| 4036 | } |
| 4037 | |
| 4038 | #endif /* IPV6 */ |
| 4039 | |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 4040 | static int selinux_parse_skb(struct sk_buff *skb, struct common_audit_data *ad, |
David Howells | cf9481e | 2008-07-27 21:31:07 +1000 | [diff] [blame] | 4041 | char **_addrp, int src, u8 *proto) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4042 | { |
David Howells | cf9481e | 2008-07-27 21:31:07 +1000 | [diff] [blame] | 4043 | char *addrp; |
| 4044 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4045 | |
Eric Paris | 48c62af | 2012-04-02 13:15:44 -0400 | [diff] [blame] | 4046 | switch (ad->u.net->family) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4047 | case PF_INET: |
Venkat Yekkirala | 67f83cb | 2006-11-08 17:04:26 -0600 | [diff] [blame] | 4048 | ret = selinux_parse_skb_ipv4(skb, ad, proto); |
David Howells | cf9481e | 2008-07-27 21:31:07 +1000 | [diff] [blame] | 4049 | if (ret) |
| 4050 | goto parse_error; |
Eric Paris | 48c62af | 2012-04-02 13:15:44 -0400 | [diff] [blame] | 4051 | addrp = (char *)(src ? &ad->u.net->v4info.saddr : |
| 4052 | &ad->u.net->v4info.daddr); |
David Howells | cf9481e | 2008-07-27 21:31:07 +1000 | [diff] [blame] | 4053 | goto okay; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4054 | |
| 4055 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
| 4056 | case PF_INET6: |
Venkat Yekkirala | 67f83cb | 2006-11-08 17:04:26 -0600 | [diff] [blame] | 4057 | ret = selinux_parse_skb_ipv6(skb, ad, proto); |
David Howells | cf9481e | 2008-07-27 21:31:07 +1000 | [diff] [blame] | 4058 | if (ret) |
| 4059 | goto parse_error; |
Eric Paris | 48c62af | 2012-04-02 13:15:44 -0400 | [diff] [blame] | 4060 | addrp = (char *)(src ? &ad->u.net->v6info.saddr : |
| 4061 | &ad->u.net->v6info.daddr); |
David Howells | cf9481e | 2008-07-27 21:31:07 +1000 | [diff] [blame] | 4062 | goto okay; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4063 | #endif /* IPV6 */ |
| 4064 | default: |
David Howells | cf9481e | 2008-07-27 21:31:07 +1000 | [diff] [blame] | 4065 | addrp = NULL; |
| 4066 | goto okay; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4067 | } |
| 4068 | |
David Howells | cf9481e | 2008-07-27 21:31:07 +1000 | [diff] [blame] | 4069 | parse_error: |
| 4070 | printk(KERN_WARNING |
| 4071 | "SELinux: failure in selinux_parse_skb()," |
| 4072 | " unable to parse packet\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4073 | return ret; |
David Howells | cf9481e | 2008-07-27 21:31:07 +1000 | [diff] [blame] | 4074 | |
| 4075 | okay: |
| 4076 | if (_addrp) |
| 4077 | *_addrp = addrp; |
| 4078 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4079 | } |
| 4080 | |
Paul Moore | 4f6a993 | 2007-03-01 14:35:22 -0500 | [diff] [blame] | 4081 | /** |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4082 | * selinux_skb_peerlbl_sid - Determine the peer label of a packet |
Paul Moore | 4f6a993 | 2007-03-01 14:35:22 -0500 | [diff] [blame] | 4083 | * @skb: the packet |
Paul Moore | 75e2291 | 2008-01-29 08:38:04 -0500 | [diff] [blame] | 4084 | * @family: protocol family |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4085 | * @sid: the packet's peer label SID |
Paul Moore | 4f6a993 | 2007-03-01 14:35:22 -0500 | [diff] [blame] | 4086 | * |
| 4087 | * Description: |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4088 | * Check the various different forms of network peer labeling and determine |
| 4089 | * the peer label/SID for the packet; most of the magic actually occurs in |
| 4090 | * the security server function security_net_peersid_cmp(). The function |
| 4091 | * returns zero if the value in @sid is valid (although it may be SECSID_NULL) |
| 4092 | * or -EACCES if @sid is invalid due to inconsistencies with the different |
| 4093 | * peer labels. |
Paul Moore | 4f6a993 | 2007-03-01 14:35:22 -0500 | [diff] [blame] | 4094 | * |
| 4095 | */ |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4096 | static int selinux_skb_peerlbl_sid(struct sk_buff *skb, u16 family, u32 *sid) |
Paul Moore | 4f6a993 | 2007-03-01 14:35:22 -0500 | [diff] [blame] | 4097 | { |
Paul Moore | 71f1cb0 | 2008-01-29 08:51:16 -0500 | [diff] [blame] | 4098 | int err; |
Paul Moore | 4f6a993 | 2007-03-01 14:35:22 -0500 | [diff] [blame] | 4099 | u32 xfrm_sid; |
| 4100 | u32 nlbl_sid; |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4101 | u32 nlbl_type; |
Paul Moore | 4f6a993 | 2007-03-01 14:35:22 -0500 | [diff] [blame] | 4102 | |
Paul Moore | 817eff7 | 2013-12-10 14:57:54 -0500 | [diff] [blame] | 4103 | err = selinux_xfrm_skb_sid(skb, &xfrm_sid); |
Paul Moore | bed4d7e | 2013-07-23 17:38:40 -0400 | [diff] [blame] | 4104 | if (unlikely(err)) |
| 4105 | return -EACCES; |
| 4106 | err = selinux_netlbl_skbuff_getsid(skb, family, &nlbl_type, &nlbl_sid); |
| 4107 | if (unlikely(err)) |
| 4108 | return -EACCES; |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4109 | |
Paul Moore | 71f1cb0 | 2008-01-29 08:51:16 -0500 | [diff] [blame] | 4110 | err = security_net_peersid_resolve(nlbl_sid, nlbl_type, xfrm_sid, sid); |
| 4111 | if (unlikely(err)) { |
| 4112 | printk(KERN_WARNING |
| 4113 | "SELinux: failure in selinux_skb_peerlbl_sid()," |
| 4114 | " unable to determine packet's peer label\n"); |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4115 | return -EACCES; |
Paul Moore | 71f1cb0 | 2008-01-29 08:51:16 -0500 | [diff] [blame] | 4116 | } |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4117 | |
| 4118 | return 0; |
Paul Moore | 4f6a993 | 2007-03-01 14:35:22 -0500 | [diff] [blame] | 4119 | } |
| 4120 | |
Paul Moore | 446b802 | 2013-12-04 16:10:51 -0500 | [diff] [blame] | 4121 | /** |
| 4122 | * selinux_conn_sid - Determine the child socket label for a connection |
| 4123 | * @sk_sid: the parent socket's SID |
| 4124 | * @skb_sid: the packet's SID |
| 4125 | * @conn_sid: the resulting connection SID |
| 4126 | * |
| 4127 | * If @skb_sid is valid then the user:role:type information from @sk_sid is |
| 4128 | * combined with the MLS information from @skb_sid in order to create |
| 4129 | * @conn_sid. If @skb_sid is not valid then then @conn_sid is simply a copy |
| 4130 | * of @sk_sid. Returns zero on success, negative values on failure. |
| 4131 | * |
| 4132 | */ |
| 4133 | static int selinux_conn_sid(u32 sk_sid, u32 skb_sid, u32 *conn_sid) |
| 4134 | { |
| 4135 | int err = 0; |
| 4136 | |
| 4137 | if (skb_sid != SECSID_NULL) |
| 4138 | err = security_sid_mls_copy(sk_sid, skb_sid, conn_sid); |
| 4139 | else |
| 4140 | *conn_sid = sk_sid; |
| 4141 | |
| 4142 | return err; |
| 4143 | } |
| 4144 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4145 | /* socket security operations */ |
Paul Moore | d4f2d97 | 2010-04-22 14:46:18 -0400 | [diff] [blame] | 4146 | |
Harry Ciao | 2ad18bd | 2011-03-02 13:32:34 +0800 | [diff] [blame] | 4147 | static int socket_sockcreate_sid(const struct task_security_struct *tsec, |
| 4148 | u16 secclass, u32 *socksid) |
Paul Moore | d4f2d97 | 2010-04-22 14:46:18 -0400 | [diff] [blame] | 4149 | { |
Harry Ciao | 2ad18bd | 2011-03-02 13:32:34 +0800 | [diff] [blame] | 4150 | if (tsec->sockcreate_sid > SECSID_NULL) { |
| 4151 | *socksid = tsec->sockcreate_sid; |
| 4152 | return 0; |
| 4153 | } |
| 4154 | |
| 4155 | return security_transition_sid(tsec->sid, tsec->sid, secclass, NULL, |
| 4156 | socksid); |
Paul Moore | d4f2d97 | 2010-04-22 14:46:18 -0400 | [diff] [blame] | 4157 | } |
| 4158 | |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 4159 | static int sock_has_perm(struct task_struct *task, struct sock *sk, u32 perms) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4160 | { |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 4161 | struct sk_security_struct *sksec = sk->sk_security; |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 4162 | struct common_audit_data ad; |
Eric Paris | 48c62af | 2012-04-02 13:15:44 -0400 | [diff] [blame] | 4163 | struct lsm_network_audit net = {0,}; |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 4164 | u32 tsid = task_sid(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4165 | |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 4166 | if (sksec->sid == SECINITSID_KERNEL) |
| 4167 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4168 | |
Eric Paris | 50c205f | 2012-04-04 15:01:43 -0400 | [diff] [blame] | 4169 | ad.type = LSM_AUDIT_DATA_NET; |
Eric Paris | 48c62af | 2012-04-02 13:15:44 -0400 | [diff] [blame] | 4170 | ad.u.net = &net; |
| 4171 | ad.u.net->sk = sk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4172 | |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 4173 | return avc_has_perm(tsid, sksec->sid, sksec->sclass, perms, &ad); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4174 | } |
| 4175 | |
| 4176 | static int selinux_socket_create(int family, int type, |
| 4177 | int protocol, int kern) |
| 4178 | { |
Paul Moore | 5fb4987 | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 4179 | const struct task_security_struct *tsec = current_security(); |
Paul Moore | d4f2d97 | 2010-04-22 14:46:18 -0400 | [diff] [blame] | 4180 | u32 newsid; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 4181 | u16 secclass; |
Harry Ciao | 2ad18bd | 2011-03-02 13:32:34 +0800 | [diff] [blame] | 4182 | int rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4183 | |
| 4184 | if (kern) |
Paul Moore | d4f2d97 | 2010-04-22 14:46:18 -0400 | [diff] [blame] | 4185 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4186 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 4187 | secclass = socket_type_to_security_class(family, type, protocol); |
Harry Ciao | 2ad18bd | 2011-03-02 13:32:34 +0800 | [diff] [blame] | 4188 | rc = socket_sockcreate_sid(tsec, secclass, &newsid); |
| 4189 | if (rc) |
| 4190 | return rc; |
| 4191 | |
Paul Moore | d4f2d97 | 2010-04-22 14:46:18 -0400 | [diff] [blame] | 4192 | return avc_has_perm(tsec->sid, newsid, secclass, SOCKET__CREATE, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4193 | } |
| 4194 | |
Venkat Yekkirala | 7420ed2 | 2006-08-04 23:17:57 -0700 | [diff] [blame] | 4195 | static int selinux_socket_post_create(struct socket *sock, int family, |
| 4196 | int type, int protocol, int kern) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4197 | { |
Paul Moore | 5fb4987 | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 4198 | const struct task_security_struct *tsec = current_security(); |
Andreas Gruenbacher | 5d226df | 2015-12-24 11:09:40 -0500 | [diff] [blame] | 4199 | struct inode_security_struct *isec = inode_security_novalidate(SOCK_INODE(sock)); |
Venkat Yekkirala | 892c141 | 2006-08-04 23:08:56 -0700 | [diff] [blame] | 4200 | struct sk_security_struct *sksec; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 4201 | int err = 0; |
| 4202 | |
Harry Ciao | 2ad18bd | 2011-03-02 13:32:34 +0800 | [diff] [blame] | 4203 | isec->sclass = socket_type_to_security_class(family, type, protocol); |
| 4204 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 4205 | if (kern) |
| 4206 | isec->sid = SECINITSID_KERNEL; |
Harry Ciao | 2ad18bd | 2011-03-02 13:32:34 +0800 | [diff] [blame] | 4207 | else { |
| 4208 | err = socket_sockcreate_sid(tsec, isec->sclass, &(isec->sid)); |
| 4209 | if (err) |
| 4210 | return err; |
| 4211 | } |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 4212 | |
Andreas Gruenbacher | 6f3be9f | 2015-12-24 11:09:40 -0500 | [diff] [blame] | 4213 | isec->initialized = LABEL_INITIALIZED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4214 | |
Venkat Yekkirala | 892c141 | 2006-08-04 23:08:56 -0700 | [diff] [blame] | 4215 | if (sock->sk) { |
| 4216 | sksec = sock->sk->sk_security; |
| 4217 | sksec->sid = isec->sid; |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4218 | sksec->sclass = isec->sclass; |
Paul Moore | 389fb800 | 2009-03-27 17:10:34 -0400 | [diff] [blame] | 4219 | err = selinux_netlbl_socket_post_create(sock->sk, family); |
Venkat Yekkirala | 892c141 | 2006-08-04 23:08:56 -0700 | [diff] [blame] | 4220 | } |
| 4221 | |
Venkat Yekkirala | 7420ed2 | 2006-08-04 23:17:57 -0700 | [diff] [blame] | 4222 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4223 | } |
| 4224 | |
| 4225 | /* Range of port numbers used to automatically bind. |
| 4226 | Need to determine whether we should perform a name_bind |
| 4227 | permission check between the socket and the port number. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4228 | |
| 4229 | static int selinux_socket_bind(struct socket *sock, struct sockaddr *address, int addrlen) |
| 4230 | { |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 4231 | struct sock *sk = sock->sk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4232 | u16 family; |
| 4233 | int err; |
| 4234 | |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 4235 | err = sock_has_perm(current, sk, SOCKET__BIND); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4236 | if (err) |
| 4237 | goto out; |
| 4238 | |
| 4239 | /* |
| 4240 | * If PF_INET or PF_INET6, check name_bind permission for the port. |
James Morris | 1340258 | 2005-09-30 14:24:34 -0400 | [diff] [blame] | 4241 | * Multiple address binding for SCTP is not supported yet: we just |
| 4242 | * check the first address now. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4243 | */ |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 4244 | family = sk->sk_family; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4245 | if (family == PF_INET || family == PF_INET6) { |
| 4246 | char *addrp; |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 4247 | struct sk_security_struct *sksec = sk->sk_security; |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 4248 | struct common_audit_data ad; |
Eric Paris | 48c62af | 2012-04-02 13:15:44 -0400 | [diff] [blame] | 4249 | struct lsm_network_audit net = {0,}; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4250 | struct sockaddr_in *addr4 = NULL; |
| 4251 | struct sockaddr_in6 *addr6 = NULL; |
| 4252 | unsigned short snum; |
James Morris | e399f98 | 2008-06-12 01:39:58 +1000 | [diff] [blame] | 4253 | u32 sid, node_perm; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4254 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4255 | if (family == PF_INET) { |
| 4256 | addr4 = (struct sockaddr_in *)address; |
| 4257 | snum = ntohs(addr4->sin_port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4258 | addrp = (char *)&addr4->sin_addr.s_addr; |
| 4259 | } else { |
| 4260 | addr6 = (struct sockaddr_in6 *)address; |
| 4261 | snum = ntohs(addr6->sin6_port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4262 | addrp = (char *)&addr6->sin6_addr.s6_addr; |
| 4263 | } |
| 4264 | |
Stephen Hemminger | 227b60f | 2007-10-10 17:30:46 -0700 | [diff] [blame] | 4265 | if (snum) { |
| 4266 | int low, high; |
| 4267 | |
Eric W. Biederman | 0bbf87d | 2013-09-28 14:10:59 -0700 | [diff] [blame] | 4268 | inet_get_local_port_range(sock_net(sk), &low, &high); |
Stephen Hemminger | 227b60f | 2007-10-10 17:30:46 -0700 | [diff] [blame] | 4269 | |
| 4270 | if (snum < max(PROT_SOCK, low) || snum > high) { |
Paul Moore | 3e11217 | 2008-04-10 10:48:14 -0400 | [diff] [blame] | 4271 | err = sel_netport_sid(sk->sk_protocol, |
| 4272 | snum, &sid); |
Stephen Hemminger | 227b60f | 2007-10-10 17:30:46 -0700 | [diff] [blame] | 4273 | if (err) |
| 4274 | goto out; |
Eric Paris | 50c205f | 2012-04-04 15:01:43 -0400 | [diff] [blame] | 4275 | ad.type = LSM_AUDIT_DATA_NET; |
Eric Paris | 48c62af | 2012-04-02 13:15:44 -0400 | [diff] [blame] | 4276 | ad.u.net = &net; |
| 4277 | ad.u.net->sport = htons(snum); |
| 4278 | ad.u.net->family = family; |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 4279 | err = avc_has_perm(sksec->sid, sid, |
| 4280 | sksec->sclass, |
Stephen Hemminger | 227b60f | 2007-10-10 17:30:46 -0700 | [diff] [blame] | 4281 | SOCKET__NAME_BIND, &ad); |
| 4282 | if (err) |
| 4283 | goto out; |
| 4284 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4285 | } |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 4286 | |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 4287 | switch (sksec->sclass) { |
James Morris | 1340258 | 2005-09-30 14:24:34 -0400 | [diff] [blame] | 4288 | case SECCLASS_TCP_SOCKET: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4289 | node_perm = TCP_SOCKET__NODE_BIND; |
| 4290 | break; |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 4291 | |
James Morris | 1340258 | 2005-09-30 14:24:34 -0400 | [diff] [blame] | 4292 | case SECCLASS_UDP_SOCKET: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4293 | node_perm = UDP_SOCKET__NODE_BIND; |
| 4294 | break; |
James Morris | 2ee92d4 | 2006-11-13 16:09:01 -0800 | [diff] [blame] | 4295 | |
| 4296 | case SECCLASS_DCCP_SOCKET: |
| 4297 | node_perm = DCCP_SOCKET__NODE_BIND; |
| 4298 | break; |
| 4299 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4300 | default: |
| 4301 | node_perm = RAWIP_SOCKET__NODE_BIND; |
| 4302 | break; |
| 4303 | } |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 4304 | |
Paul Moore | 224dfbd | 2008-01-29 08:38:13 -0500 | [diff] [blame] | 4305 | err = sel_netnode_sid(addrp, family, &sid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4306 | if (err) |
| 4307 | goto out; |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 4308 | |
Eric Paris | 50c205f | 2012-04-04 15:01:43 -0400 | [diff] [blame] | 4309 | ad.type = LSM_AUDIT_DATA_NET; |
Eric Paris | 48c62af | 2012-04-02 13:15:44 -0400 | [diff] [blame] | 4310 | ad.u.net = &net; |
| 4311 | ad.u.net->sport = htons(snum); |
| 4312 | ad.u.net->family = family; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4313 | |
| 4314 | if (family == PF_INET) |
Eric Paris | 48c62af | 2012-04-02 13:15:44 -0400 | [diff] [blame] | 4315 | ad.u.net->v4info.saddr = addr4->sin_addr.s_addr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4316 | else |
Eric Paris | 48c62af | 2012-04-02 13:15:44 -0400 | [diff] [blame] | 4317 | ad.u.net->v6info.saddr = addr6->sin6_addr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4318 | |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 4319 | err = avc_has_perm(sksec->sid, sid, |
| 4320 | sksec->sclass, node_perm, &ad); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4321 | if (err) |
| 4322 | goto out; |
| 4323 | } |
| 4324 | out: |
| 4325 | return err; |
| 4326 | } |
| 4327 | |
| 4328 | static int selinux_socket_connect(struct socket *sock, struct sockaddr *address, int addrlen) |
| 4329 | { |
Paul Moore | 014ab19 | 2008-10-10 10:16:33 -0400 | [diff] [blame] | 4330 | struct sock *sk = sock->sk; |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 4331 | struct sk_security_struct *sksec = sk->sk_security; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4332 | int err; |
| 4333 | |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 4334 | err = sock_has_perm(current, sk, SOCKET__CONNECT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4335 | if (err) |
| 4336 | return err; |
| 4337 | |
| 4338 | /* |
James Morris | 2ee92d4 | 2006-11-13 16:09:01 -0800 | [diff] [blame] | 4339 | * If a TCP or DCCP socket, check name_connect permission for the port. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4340 | */ |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 4341 | if (sksec->sclass == SECCLASS_TCP_SOCKET || |
| 4342 | sksec->sclass == SECCLASS_DCCP_SOCKET) { |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 4343 | struct common_audit_data ad; |
Eric Paris | 48c62af | 2012-04-02 13:15:44 -0400 | [diff] [blame] | 4344 | struct lsm_network_audit net = {0,}; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4345 | struct sockaddr_in *addr4 = NULL; |
| 4346 | struct sockaddr_in6 *addr6 = NULL; |
| 4347 | unsigned short snum; |
James Morris | 2ee92d4 | 2006-11-13 16:09:01 -0800 | [diff] [blame] | 4348 | u32 sid, perm; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4349 | |
| 4350 | if (sk->sk_family == PF_INET) { |
| 4351 | addr4 = (struct sockaddr_in *)address; |
Stephen Smalley | 911656f | 2005-07-28 21:16:21 -0700 | [diff] [blame] | 4352 | if (addrlen < sizeof(struct sockaddr_in)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4353 | return -EINVAL; |
| 4354 | snum = ntohs(addr4->sin_port); |
| 4355 | } else { |
| 4356 | addr6 = (struct sockaddr_in6 *)address; |
Stephen Smalley | 911656f | 2005-07-28 21:16:21 -0700 | [diff] [blame] | 4357 | if (addrlen < SIN6_LEN_RFC2133) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4358 | return -EINVAL; |
| 4359 | snum = ntohs(addr6->sin6_port); |
| 4360 | } |
| 4361 | |
Paul Moore | 3e11217 | 2008-04-10 10:48:14 -0400 | [diff] [blame] | 4362 | err = sel_netport_sid(sk->sk_protocol, snum, &sid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4363 | if (err) |
| 4364 | goto out; |
| 4365 | |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 4366 | perm = (sksec->sclass == SECCLASS_TCP_SOCKET) ? |
James Morris | 2ee92d4 | 2006-11-13 16:09:01 -0800 | [diff] [blame] | 4367 | TCP_SOCKET__NAME_CONNECT : DCCP_SOCKET__NAME_CONNECT; |
| 4368 | |
Eric Paris | 50c205f | 2012-04-04 15:01:43 -0400 | [diff] [blame] | 4369 | ad.type = LSM_AUDIT_DATA_NET; |
Eric Paris | 48c62af | 2012-04-02 13:15:44 -0400 | [diff] [blame] | 4370 | ad.u.net = &net; |
| 4371 | ad.u.net->dport = htons(snum); |
| 4372 | ad.u.net->family = sk->sk_family; |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 4373 | err = avc_has_perm(sksec->sid, sid, sksec->sclass, perm, &ad); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4374 | if (err) |
| 4375 | goto out; |
| 4376 | } |
| 4377 | |
Paul Moore | 014ab19 | 2008-10-10 10:16:33 -0400 | [diff] [blame] | 4378 | err = selinux_netlbl_socket_connect(sk, address); |
| 4379 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4380 | out: |
| 4381 | return err; |
| 4382 | } |
| 4383 | |
| 4384 | static int selinux_socket_listen(struct socket *sock, int backlog) |
| 4385 | { |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 4386 | return sock_has_perm(current, sock->sk, SOCKET__LISTEN); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4387 | } |
| 4388 | |
| 4389 | static int selinux_socket_accept(struct socket *sock, struct socket *newsock) |
| 4390 | { |
| 4391 | int err; |
| 4392 | struct inode_security_struct *isec; |
| 4393 | struct inode_security_struct *newisec; |
| 4394 | |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 4395 | err = sock_has_perm(current, sock->sk, SOCKET__ACCEPT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4396 | if (err) |
| 4397 | return err; |
| 4398 | |
Andreas Gruenbacher | 5d226df | 2015-12-24 11:09:40 -0500 | [diff] [blame] | 4399 | newisec = inode_security_novalidate(SOCK_INODE(newsock)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4400 | |
Andreas Gruenbacher | 5d226df | 2015-12-24 11:09:40 -0500 | [diff] [blame] | 4401 | isec = inode_security_novalidate(SOCK_INODE(sock)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4402 | newisec->sclass = isec->sclass; |
| 4403 | newisec->sid = isec->sid; |
Andreas Gruenbacher | 6f3be9f | 2015-12-24 11:09:40 -0500 | [diff] [blame] | 4404 | newisec->initialized = LABEL_INITIALIZED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4405 | |
| 4406 | return 0; |
| 4407 | } |
| 4408 | |
| 4409 | static int selinux_socket_sendmsg(struct socket *sock, struct msghdr *msg, |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 4410 | int size) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4411 | { |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 4412 | return sock_has_perm(current, sock->sk, SOCKET__WRITE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4413 | } |
| 4414 | |
| 4415 | static int selinux_socket_recvmsg(struct socket *sock, struct msghdr *msg, |
| 4416 | int size, int flags) |
| 4417 | { |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 4418 | return sock_has_perm(current, sock->sk, SOCKET__READ); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4419 | } |
| 4420 | |
| 4421 | static int selinux_socket_getsockname(struct socket *sock) |
| 4422 | { |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 4423 | return sock_has_perm(current, sock->sk, SOCKET__GETATTR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4424 | } |
| 4425 | |
| 4426 | static int selinux_socket_getpeername(struct socket *sock) |
| 4427 | { |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 4428 | return sock_has_perm(current, sock->sk, SOCKET__GETATTR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4429 | } |
| 4430 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 4431 | static int selinux_socket_setsockopt(struct socket *sock, int level, int optname) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4432 | { |
Paul Moore | f8687af | 2006-10-30 15:22:15 -0800 | [diff] [blame] | 4433 | int err; |
| 4434 | |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 4435 | err = sock_has_perm(current, sock->sk, SOCKET__SETOPT); |
Paul Moore | f8687af | 2006-10-30 15:22:15 -0800 | [diff] [blame] | 4436 | if (err) |
| 4437 | return err; |
| 4438 | |
| 4439 | return selinux_netlbl_socket_setsockopt(sock, level, optname); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4440 | } |
| 4441 | |
| 4442 | static int selinux_socket_getsockopt(struct socket *sock, int level, |
| 4443 | int optname) |
| 4444 | { |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 4445 | return sock_has_perm(current, sock->sk, SOCKET__GETOPT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4446 | } |
| 4447 | |
| 4448 | static int selinux_socket_shutdown(struct socket *sock, int how) |
| 4449 | { |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 4450 | return sock_has_perm(current, sock->sk, SOCKET__SHUTDOWN); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4451 | } |
| 4452 | |
David S. Miller | 3610cda | 2011-01-05 15:38:53 -0800 | [diff] [blame] | 4453 | static int selinux_socket_unix_stream_connect(struct sock *sock, |
| 4454 | struct sock *other, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4455 | struct sock *newsk) |
| 4456 | { |
David S. Miller | 3610cda | 2011-01-05 15:38:53 -0800 | [diff] [blame] | 4457 | struct sk_security_struct *sksec_sock = sock->sk_security; |
| 4458 | struct sk_security_struct *sksec_other = other->sk_security; |
Paul Moore | 4d1e245 | 2010-04-22 14:46:18 -0400 | [diff] [blame] | 4459 | struct sk_security_struct *sksec_new = newsk->sk_security; |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 4460 | struct common_audit_data ad; |
Eric Paris | 48c62af | 2012-04-02 13:15:44 -0400 | [diff] [blame] | 4461 | struct lsm_network_audit net = {0,}; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4462 | int err; |
| 4463 | |
Eric Paris | 50c205f | 2012-04-04 15:01:43 -0400 | [diff] [blame] | 4464 | ad.type = LSM_AUDIT_DATA_NET; |
Eric Paris | 48c62af | 2012-04-02 13:15:44 -0400 | [diff] [blame] | 4465 | ad.u.net = &net; |
| 4466 | ad.u.net->sk = other; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4467 | |
Paul Moore | 4d1e245 | 2010-04-22 14:46:18 -0400 | [diff] [blame] | 4468 | err = avc_has_perm(sksec_sock->sid, sksec_other->sid, |
| 4469 | sksec_other->sclass, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4470 | UNIX_STREAM_SOCKET__CONNECTTO, &ad); |
| 4471 | if (err) |
| 4472 | return err; |
| 4473 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4474 | /* server child socket */ |
Paul Moore | 4d1e245 | 2010-04-22 14:46:18 -0400 | [diff] [blame] | 4475 | sksec_new->peer_sid = sksec_sock->sid; |
| 4476 | err = security_sid_mls_copy(sksec_other->sid, sksec_sock->sid, |
| 4477 | &sksec_new->sid); |
| 4478 | if (err) |
| 4479 | return err; |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 4480 | |
Paul Moore | 4d1e245 | 2010-04-22 14:46:18 -0400 | [diff] [blame] | 4481 | /* connecting socket */ |
| 4482 | sksec_sock->peer_sid = sksec_new->sid; |
| 4483 | |
| 4484 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4485 | } |
| 4486 | |
| 4487 | static int selinux_socket_unix_may_send(struct socket *sock, |
| 4488 | struct socket *other) |
| 4489 | { |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 4490 | struct sk_security_struct *ssec = sock->sk->sk_security; |
| 4491 | struct sk_security_struct *osec = other->sk->sk_security; |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 4492 | struct common_audit_data ad; |
Eric Paris | 48c62af | 2012-04-02 13:15:44 -0400 | [diff] [blame] | 4493 | struct lsm_network_audit net = {0,}; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4494 | |
Eric Paris | 50c205f | 2012-04-04 15:01:43 -0400 | [diff] [blame] | 4495 | ad.type = LSM_AUDIT_DATA_NET; |
Eric Paris | 48c62af | 2012-04-02 13:15:44 -0400 | [diff] [blame] | 4496 | ad.u.net = &net; |
| 4497 | ad.u.net->sk = other->sk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4498 | |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 4499 | return avc_has_perm(ssec->sid, osec->sid, osec->sclass, SOCKET__SENDTO, |
| 4500 | &ad); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4501 | } |
| 4502 | |
Paul Moore | cbe0d6e | 2014-09-10 17:09:57 -0400 | [diff] [blame] | 4503 | static int selinux_inet_sys_rcv_skb(struct net *ns, int ifindex, |
| 4504 | char *addrp, u16 family, u32 peer_sid, |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 4505 | struct common_audit_data *ad) |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4506 | { |
| 4507 | int err; |
| 4508 | u32 if_sid; |
| 4509 | u32 node_sid; |
| 4510 | |
Paul Moore | cbe0d6e | 2014-09-10 17:09:57 -0400 | [diff] [blame] | 4511 | err = sel_netif_sid(ns, ifindex, &if_sid); |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4512 | if (err) |
| 4513 | return err; |
| 4514 | err = avc_has_perm(peer_sid, if_sid, |
| 4515 | SECCLASS_NETIF, NETIF__INGRESS, ad); |
| 4516 | if (err) |
| 4517 | return err; |
| 4518 | |
| 4519 | err = sel_netnode_sid(addrp, family, &node_sid); |
| 4520 | if (err) |
| 4521 | return err; |
| 4522 | return avc_has_perm(peer_sid, node_sid, |
| 4523 | SECCLASS_NODE, NODE__RECVFROM, ad); |
| 4524 | } |
| 4525 | |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4526 | static int selinux_sock_rcv_skb_compat(struct sock *sk, struct sk_buff *skb, |
Paul Moore | d8395c8 | 2008-10-10 10:16:30 -0400 | [diff] [blame] | 4527 | u16 family) |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4528 | { |
Paul Moore | 277d342 | 2008-12-31 12:54:11 -0500 | [diff] [blame] | 4529 | int err = 0; |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4530 | struct sk_security_struct *sksec = sk->sk_security; |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4531 | u32 sk_sid = sksec->sid; |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 4532 | struct common_audit_data ad; |
Eric Paris | 48c62af | 2012-04-02 13:15:44 -0400 | [diff] [blame] | 4533 | struct lsm_network_audit net = {0,}; |
Paul Moore | d8395c8 | 2008-10-10 10:16:30 -0400 | [diff] [blame] | 4534 | char *addrp; |
| 4535 | |
Eric Paris | 50c205f | 2012-04-04 15:01:43 -0400 | [diff] [blame] | 4536 | ad.type = LSM_AUDIT_DATA_NET; |
Eric Paris | 48c62af | 2012-04-02 13:15:44 -0400 | [diff] [blame] | 4537 | ad.u.net = &net; |
| 4538 | ad.u.net->netif = skb->skb_iif; |
| 4539 | ad.u.net->family = family; |
Paul Moore | d8395c8 | 2008-10-10 10:16:30 -0400 | [diff] [blame] | 4540 | err = selinux_parse_skb(skb, &ad, &addrp, 1, NULL); |
| 4541 | if (err) |
| 4542 | return err; |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4543 | |
Paul Moore | 58bfbb5 | 2009-03-27 17:10:41 -0400 | [diff] [blame] | 4544 | if (selinux_secmark_enabled()) { |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4545 | err = avc_has_perm(sk_sid, skb->secmark, SECCLASS_PACKET, |
Paul Moore | d8395c8 | 2008-10-10 10:16:30 -0400 | [diff] [blame] | 4546 | PACKET__RECV, &ad); |
Paul Moore | 58bfbb5 | 2009-03-27 17:10:41 -0400 | [diff] [blame] | 4547 | if (err) |
| 4548 | return err; |
| 4549 | } |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4550 | |
Steffen Klassert | b9679a7 | 2011-02-23 12:55:21 +0100 | [diff] [blame] | 4551 | err = selinux_netlbl_sock_rcv_skb(sksec, skb, family, &ad); |
| 4552 | if (err) |
| 4553 | return err; |
| 4554 | err = selinux_xfrm_sock_rcv_skb(sksec->sid, skb, &ad); |
Trent Jaeger | d28d1e0 | 2005-12-13 23:12:40 -0800 | [diff] [blame] | 4555 | |
James Morris | 4e5ab4c | 2006-06-09 00:33:33 -0700 | [diff] [blame] | 4556 | return err; |
| 4557 | } |
Trent Jaeger | d28d1e0 | 2005-12-13 23:12:40 -0800 | [diff] [blame] | 4558 | |
James Morris | 4e5ab4c | 2006-06-09 00:33:33 -0700 | [diff] [blame] | 4559 | static int selinux_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb) |
| 4560 | { |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4561 | int err; |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 4562 | struct sk_security_struct *sksec = sk->sk_security; |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4563 | u16 family = sk->sk_family; |
| 4564 | u32 sk_sid = sksec->sid; |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 4565 | struct common_audit_data ad; |
Eric Paris | 48c62af | 2012-04-02 13:15:44 -0400 | [diff] [blame] | 4566 | struct lsm_network_audit net = {0,}; |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4567 | char *addrp; |
Paul Moore | d8395c8 | 2008-10-10 10:16:30 -0400 | [diff] [blame] | 4568 | u8 secmark_active; |
| 4569 | u8 peerlbl_active; |
James Morris | 4e5ab4c | 2006-06-09 00:33:33 -0700 | [diff] [blame] | 4570 | |
James Morris | 4e5ab4c | 2006-06-09 00:33:33 -0700 | [diff] [blame] | 4571 | if (family != PF_INET && family != PF_INET6) |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4572 | return 0; |
James Morris | 4e5ab4c | 2006-06-09 00:33:33 -0700 | [diff] [blame] | 4573 | |
| 4574 | /* Handle mapped IPv4 packets arriving via IPv6 sockets */ |
Al Viro | 87fcd70 | 2006-12-04 22:00:55 +0000 | [diff] [blame] | 4575 | if (family == PF_INET6 && skb->protocol == htons(ETH_P_IP)) |
James Morris | 4e5ab4c | 2006-06-09 00:33:33 -0700 | [diff] [blame] | 4576 | family = PF_INET; |
| 4577 | |
Paul Moore | d8395c8 | 2008-10-10 10:16:30 -0400 | [diff] [blame] | 4578 | /* If any sort of compatibility mode is enabled then handoff processing |
| 4579 | * to the selinux_sock_rcv_skb_compat() function to deal with the |
| 4580 | * special handling. We do this in an attempt to keep this function |
| 4581 | * as fast and as clean as possible. */ |
Paul Moore | 58bfbb5 | 2009-03-27 17:10:41 -0400 | [diff] [blame] | 4582 | if (!selinux_policycap_netpeer) |
Paul Moore | d8395c8 | 2008-10-10 10:16:30 -0400 | [diff] [blame] | 4583 | return selinux_sock_rcv_skb_compat(sk, skb, family); |
| 4584 | |
| 4585 | secmark_active = selinux_secmark_enabled(); |
Chris PeBenito | 2be4d74 | 2013-05-03 09:05:39 -0400 | [diff] [blame] | 4586 | peerlbl_active = selinux_peerlbl_enabled(); |
Paul Moore | d8395c8 | 2008-10-10 10:16:30 -0400 | [diff] [blame] | 4587 | if (!secmark_active && !peerlbl_active) |
| 4588 | return 0; |
| 4589 | |
Eric Paris | 50c205f | 2012-04-04 15:01:43 -0400 | [diff] [blame] | 4590 | ad.type = LSM_AUDIT_DATA_NET; |
Eric Paris | 48c62af | 2012-04-02 13:15:44 -0400 | [diff] [blame] | 4591 | ad.u.net = &net; |
| 4592 | ad.u.net->netif = skb->skb_iif; |
| 4593 | ad.u.net->family = family; |
Paul Moore | 224dfbd | 2008-01-29 08:38:13 -0500 | [diff] [blame] | 4594 | err = selinux_parse_skb(skb, &ad, &addrp, 1, NULL); |
James Morris | 4e5ab4c | 2006-06-09 00:33:33 -0700 | [diff] [blame] | 4595 | if (err) |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4596 | return err; |
James Morris | 4e5ab4c | 2006-06-09 00:33:33 -0700 | [diff] [blame] | 4597 | |
Paul Moore | d8395c8 | 2008-10-10 10:16:30 -0400 | [diff] [blame] | 4598 | if (peerlbl_active) { |
Paul Moore | d621d35 | 2008-01-29 08:43:36 -0500 | [diff] [blame] | 4599 | u32 peer_sid; |
| 4600 | |
| 4601 | err = selinux_skb_peerlbl_sid(skb, family, &peer_sid); |
| 4602 | if (err) |
| 4603 | return err; |
Paul Moore | cbe0d6e | 2014-09-10 17:09:57 -0400 | [diff] [blame] | 4604 | err = selinux_inet_sys_rcv_skb(sock_net(sk), skb->skb_iif, |
| 4605 | addrp, family, peer_sid, &ad); |
Paul Moore | dfaebe9 | 2008-10-10 10:16:31 -0400 | [diff] [blame] | 4606 | if (err) { |
| 4607 | selinux_netlbl_err(skb, err, 0); |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4608 | return err; |
Paul Moore | dfaebe9 | 2008-10-10 10:16:31 -0400 | [diff] [blame] | 4609 | } |
Paul Moore | d621d35 | 2008-01-29 08:43:36 -0500 | [diff] [blame] | 4610 | err = avc_has_perm(sk_sid, peer_sid, SECCLASS_PEER, |
| 4611 | PEER__RECV, &ad); |
Chad Hanson | 46d01d6 | 2013-12-23 17:45:01 -0500 | [diff] [blame] | 4612 | if (err) { |
Paul Moore | dfaebe9 | 2008-10-10 10:16:31 -0400 | [diff] [blame] | 4613 | selinux_netlbl_err(skb, err, 0); |
Chad Hanson | 46d01d6 | 2013-12-23 17:45:01 -0500 | [diff] [blame] | 4614 | return err; |
| 4615 | } |
Paul Moore | d621d35 | 2008-01-29 08:43:36 -0500 | [diff] [blame] | 4616 | } |
| 4617 | |
Paul Moore | d8395c8 | 2008-10-10 10:16:30 -0400 | [diff] [blame] | 4618 | if (secmark_active) { |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4619 | err = avc_has_perm(sk_sid, skb->secmark, SECCLASS_PACKET, |
| 4620 | PACKET__RECV, &ad); |
| 4621 | if (err) |
| 4622 | return err; |
| 4623 | } |
| 4624 | |
Paul Moore | d621d35 | 2008-01-29 08:43:36 -0500 | [diff] [blame] | 4625 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4626 | } |
| 4627 | |
Catherine Zhang | 2c7946a | 2006-03-20 22:41:23 -0800 | [diff] [blame] | 4628 | static int selinux_socket_getpeersec_stream(struct socket *sock, char __user *optval, |
| 4629 | int __user *optlen, unsigned len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4630 | { |
| 4631 | int err = 0; |
| 4632 | char *scontext; |
| 4633 | u32 scontext_len; |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 4634 | struct sk_security_struct *sksec = sock->sk->sk_security; |
Paul Moore | 3de4bab | 2006-11-17 17:38:54 -0500 | [diff] [blame] | 4635 | u32 peer_sid = SECSID_NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4636 | |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 4637 | if (sksec->sclass == SECCLASS_UNIX_STREAM_SOCKET || |
| 4638 | sksec->sclass == SECCLASS_TCP_SOCKET) |
Eric Paris | dd3e783 | 2010-04-07 15:08:46 -0400 | [diff] [blame] | 4639 | peer_sid = sksec->peer_sid; |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 4640 | if (peer_sid == SECSID_NULL) |
| 4641 | return -ENOPROTOOPT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4642 | |
Catherine Zhang | 2c7946a | 2006-03-20 22:41:23 -0800 | [diff] [blame] | 4643 | err = security_sid_to_context(peer_sid, &scontext, &scontext_len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4644 | if (err) |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 4645 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4646 | |
| 4647 | if (scontext_len > len) { |
| 4648 | err = -ERANGE; |
| 4649 | goto out_len; |
| 4650 | } |
| 4651 | |
| 4652 | if (copy_to_user(optval, scontext, scontext_len)) |
| 4653 | err = -EFAULT; |
| 4654 | |
| 4655 | out_len: |
| 4656 | if (put_user(scontext_len, optlen)) |
| 4657 | err = -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4658 | kfree(scontext); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4659 | return err; |
| 4660 | } |
| 4661 | |
Catherine Zhang | dc49c1f | 2006-08-02 14:12:06 -0700 | [diff] [blame] | 4662 | static int selinux_socket_getpeersec_dgram(struct socket *sock, struct sk_buff *skb, u32 *secid) |
Catherine Zhang | 2c7946a | 2006-03-20 22:41:23 -0800 | [diff] [blame] | 4663 | { |
Catherine Zhang | dc49c1f | 2006-08-02 14:12:06 -0700 | [diff] [blame] | 4664 | u32 peer_secid = SECSID_NULL; |
Paul Moore | 75e2291 | 2008-01-29 08:38:04 -0500 | [diff] [blame] | 4665 | u16 family; |
Paul Moore | 899134f | 2016-03-28 15:19:10 -0400 | [diff] [blame] | 4666 | struct inode_security_struct *isec; |
Catherine Zhang | 877ce7c | 2006-06-29 12:27:47 -0700 | [diff] [blame] | 4667 | |
Paul Moore | aa86290 | 2008-10-10 10:16:29 -0400 | [diff] [blame] | 4668 | if (skb && skb->protocol == htons(ETH_P_IP)) |
| 4669 | family = PF_INET; |
| 4670 | else if (skb && skb->protocol == htons(ETH_P_IPV6)) |
| 4671 | family = PF_INET6; |
| 4672 | else if (sock) |
Paul Moore | 75e2291 | 2008-01-29 08:38:04 -0500 | [diff] [blame] | 4673 | family = sock->sk->sk_family; |
Paul Moore | 75e2291 | 2008-01-29 08:38:04 -0500 | [diff] [blame] | 4674 | else |
| 4675 | goto out; |
| 4676 | |
Paul Moore | 899134f | 2016-03-28 15:19:10 -0400 | [diff] [blame] | 4677 | if (sock && family == PF_UNIX) { |
| 4678 | isec = inode_security_novalidate(SOCK_INODE(sock)); |
| 4679 | peer_secid = isec->sid; |
| 4680 | } else if (skb) |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4681 | selinux_skb_peerlbl_sid(skb, family, &peer_secid); |
Catherine Zhang | 2c7946a | 2006-03-20 22:41:23 -0800 | [diff] [blame] | 4682 | |
Paul Moore | 75e2291 | 2008-01-29 08:38:04 -0500 | [diff] [blame] | 4683 | out: |
Catherine Zhang | dc49c1f | 2006-08-02 14:12:06 -0700 | [diff] [blame] | 4684 | *secid = peer_secid; |
Paul Moore | 75e2291 | 2008-01-29 08:38:04 -0500 | [diff] [blame] | 4685 | if (peer_secid == SECSID_NULL) |
| 4686 | return -EINVAL; |
| 4687 | return 0; |
Catherine Zhang | 2c7946a | 2006-03-20 22:41:23 -0800 | [diff] [blame] | 4688 | } |
| 4689 | |
Al Viro | 7d877f3 | 2005-10-21 03:20:43 -0400 | [diff] [blame] | 4690 | static int selinux_sk_alloc_security(struct sock *sk, int family, gfp_t priority) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4691 | { |
Paul Moore | 84914b7 | 2010-04-22 14:46:18 -0400 | [diff] [blame] | 4692 | struct sk_security_struct *sksec; |
| 4693 | |
| 4694 | sksec = kzalloc(sizeof(*sksec), priority); |
| 4695 | if (!sksec) |
| 4696 | return -ENOMEM; |
| 4697 | |
| 4698 | sksec->peer_sid = SECINITSID_UNLABELED; |
| 4699 | sksec->sid = SECINITSID_UNLABELED; |
Stephen Smalley | 5dee25d | 2015-07-10 17:19:57 -0400 | [diff] [blame] | 4700 | sksec->sclass = SECCLASS_SOCKET; |
Paul Moore | 84914b7 | 2010-04-22 14:46:18 -0400 | [diff] [blame] | 4701 | selinux_netlbl_sk_security_reset(sksec); |
| 4702 | sk->sk_security = sksec; |
| 4703 | |
| 4704 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4705 | } |
| 4706 | |
| 4707 | static void selinux_sk_free_security(struct sock *sk) |
| 4708 | { |
Paul Moore | 84914b7 | 2010-04-22 14:46:18 -0400 | [diff] [blame] | 4709 | struct sk_security_struct *sksec = sk->sk_security; |
| 4710 | |
| 4711 | sk->sk_security = NULL; |
| 4712 | selinux_netlbl_sk_security_free(sksec); |
| 4713 | kfree(sksec); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4714 | } |
| 4715 | |
Venkat Yekkirala | 892c141 | 2006-08-04 23:08:56 -0700 | [diff] [blame] | 4716 | static void selinux_sk_clone_security(const struct sock *sk, struct sock *newsk) |
| 4717 | { |
Eric Paris | dd3e783 | 2010-04-07 15:08:46 -0400 | [diff] [blame] | 4718 | struct sk_security_struct *sksec = sk->sk_security; |
| 4719 | struct sk_security_struct *newsksec = newsk->sk_security; |
Venkat Yekkirala | 892c141 | 2006-08-04 23:08:56 -0700 | [diff] [blame] | 4720 | |
Eric Paris | dd3e783 | 2010-04-07 15:08:46 -0400 | [diff] [blame] | 4721 | newsksec->sid = sksec->sid; |
| 4722 | newsksec->peer_sid = sksec->peer_sid; |
| 4723 | newsksec->sclass = sksec->sclass; |
Paul Moore | 99f59ed | 2006-08-29 17:53:48 -0700 | [diff] [blame] | 4724 | |
Eric Paris | dd3e783 | 2010-04-07 15:08:46 -0400 | [diff] [blame] | 4725 | selinux_netlbl_sk_security_reset(newsksec); |
Venkat Yekkirala | 892c141 | 2006-08-04 23:08:56 -0700 | [diff] [blame] | 4726 | } |
| 4727 | |
Venkat Yekkirala | beb8d13 | 2006-08-04 23:12:42 -0700 | [diff] [blame] | 4728 | static void selinux_sk_getsecid(struct sock *sk, u32 *secid) |
Trent Jaeger | d28d1e0 | 2005-12-13 23:12:40 -0800 | [diff] [blame] | 4729 | { |
Trent Jaeger | d28d1e0 | 2005-12-13 23:12:40 -0800 | [diff] [blame] | 4730 | if (!sk) |
Venkat Yekkirala | beb8d13 | 2006-08-04 23:12:42 -0700 | [diff] [blame] | 4731 | *secid = SECINITSID_ANY_SOCKET; |
Venkat Yekkirala | 892c141 | 2006-08-04 23:08:56 -0700 | [diff] [blame] | 4732 | else { |
| 4733 | struct sk_security_struct *sksec = sk->sk_security; |
Trent Jaeger | d28d1e0 | 2005-12-13 23:12:40 -0800 | [diff] [blame] | 4734 | |
Venkat Yekkirala | beb8d13 | 2006-08-04 23:12:42 -0700 | [diff] [blame] | 4735 | *secid = sksec->sid; |
Venkat Yekkirala | 892c141 | 2006-08-04 23:08:56 -0700 | [diff] [blame] | 4736 | } |
Trent Jaeger | d28d1e0 | 2005-12-13 23:12:40 -0800 | [diff] [blame] | 4737 | } |
| 4738 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 4739 | static void selinux_sock_graft(struct sock *sk, struct socket *parent) |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 4740 | { |
Andreas Gruenbacher | 5d226df | 2015-12-24 11:09:40 -0500 | [diff] [blame] | 4741 | struct inode_security_struct *isec = |
| 4742 | inode_security_novalidate(SOCK_INODE(parent)); |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 4743 | struct sk_security_struct *sksec = sk->sk_security; |
| 4744 | |
Paul Moore | 2873ead | 2014-07-28 10:42:48 -0400 | [diff] [blame] | 4745 | if (sk->sk_family == PF_INET || sk->sk_family == PF_INET6 || |
| 4746 | sk->sk_family == PF_UNIX) |
David Woodhouse | 2148ccc | 2006-09-29 15:50:25 -0700 | [diff] [blame] | 4747 | isec->sid = sksec->sid; |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4748 | sksec->sclass = isec->sclass; |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 4749 | } |
| 4750 | |
Adrian Bunk | 9a673e5 | 2006-08-15 00:03:53 -0700 | [diff] [blame] | 4751 | static int selinux_inet_conn_request(struct sock *sk, struct sk_buff *skb, |
| 4752 | struct request_sock *req) |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 4753 | { |
| 4754 | struct sk_security_struct *sksec = sk->sk_security; |
| 4755 | int err; |
Paul Moore | 0b1f24e | 2013-12-03 11:39:13 -0500 | [diff] [blame] | 4756 | u16 family = req->rsk_ops->family; |
Paul Moore | 446b802 | 2013-12-04 16:10:51 -0500 | [diff] [blame] | 4757 | u32 connsid; |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 4758 | u32 peersid; |
| 4759 | |
Paul Moore | aa86290 | 2008-10-10 10:16:29 -0400 | [diff] [blame] | 4760 | err = selinux_skb_peerlbl_sid(skb, family, &peersid); |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4761 | if (err) |
| 4762 | return err; |
Paul Moore | 446b802 | 2013-12-04 16:10:51 -0500 | [diff] [blame] | 4763 | err = selinux_conn_sid(sksec->sid, peersid, &connsid); |
| 4764 | if (err) |
| 4765 | return err; |
| 4766 | req->secid = connsid; |
| 4767 | req->peer_secid = peersid; |
Venkat Yekkirala | a51c64f | 2006-07-27 22:01:34 -0700 | [diff] [blame] | 4768 | |
Paul Moore | 389fb800 | 2009-03-27 17:10:34 -0400 | [diff] [blame] | 4769 | return selinux_netlbl_inet_conn_request(req, family); |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 4770 | } |
| 4771 | |
Adrian Bunk | 9a673e5 | 2006-08-15 00:03:53 -0700 | [diff] [blame] | 4772 | static void selinux_inet_csk_clone(struct sock *newsk, |
| 4773 | const struct request_sock *req) |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 4774 | { |
| 4775 | struct sk_security_struct *newsksec = newsk->sk_security; |
| 4776 | |
| 4777 | newsksec->sid = req->secid; |
Venkat Yekkirala | 6b87769 | 2006-11-08 17:04:09 -0600 | [diff] [blame] | 4778 | newsksec->peer_sid = req->peer_secid; |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 4779 | /* NOTE: Ideally, we should also get the isec->sid for the |
| 4780 | new socket in sync, but we don't have the isec available yet. |
| 4781 | So we will wait until sock_graft to do it, by which |
| 4782 | time it will have been created and available. */ |
Paul Moore | 99f59ed | 2006-08-29 17:53:48 -0700 | [diff] [blame] | 4783 | |
Paul Moore | 9f2ad66 | 2006-11-17 17:38:53 -0500 | [diff] [blame] | 4784 | /* We don't need to take any sort of lock here as we are the only |
| 4785 | * thread with access to newsksec */ |
Paul Moore | 389fb800 | 2009-03-27 17:10:34 -0400 | [diff] [blame] | 4786 | selinux_netlbl_inet_csk_clone(newsk, req->rsk_ops->family); |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 4787 | } |
| 4788 | |
Paul Moore | 014ab19 | 2008-10-10 10:16:33 -0400 | [diff] [blame] | 4789 | static void selinux_inet_conn_established(struct sock *sk, struct sk_buff *skb) |
Venkat Yekkirala | 6b87769 | 2006-11-08 17:04:09 -0600 | [diff] [blame] | 4790 | { |
Paul Moore | aa86290 | 2008-10-10 10:16:29 -0400 | [diff] [blame] | 4791 | u16 family = sk->sk_family; |
Venkat Yekkirala | 6b87769 | 2006-11-08 17:04:09 -0600 | [diff] [blame] | 4792 | struct sk_security_struct *sksec = sk->sk_security; |
| 4793 | |
Paul Moore | aa86290 | 2008-10-10 10:16:29 -0400 | [diff] [blame] | 4794 | /* handle mapped IPv4 packets arriving via IPv6 sockets */ |
| 4795 | if (family == PF_INET6 && skb->protocol == htons(ETH_P_IP)) |
| 4796 | family = PF_INET; |
| 4797 | |
| 4798 | selinux_skb_peerlbl_sid(skb, family, &sksec->peer_sid); |
Venkat Yekkirala | 6b87769 | 2006-11-08 17:04:09 -0600 | [diff] [blame] | 4799 | } |
| 4800 | |
Eric Paris | 2606fd1 | 2010-10-13 16:24:41 -0400 | [diff] [blame] | 4801 | static int selinux_secmark_relabel_packet(u32 sid) |
| 4802 | { |
| 4803 | const struct task_security_struct *__tsec; |
| 4804 | u32 tsid; |
| 4805 | |
| 4806 | __tsec = current_security(); |
| 4807 | tsid = __tsec->sid; |
| 4808 | |
| 4809 | return avc_has_perm(tsid, sid, SECCLASS_PACKET, PACKET__RELABELTO, NULL); |
| 4810 | } |
| 4811 | |
| 4812 | static void selinux_secmark_refcount_inc(void) |
| 4813 | { |
| 4814 | atomic_inc(&selinux_secmark_refcount); |
| 4815 | } |
| 4816 | |
| 4817 | static void selinux_secmark_refcount_dec(void) |
| 4818 | { |
| 4819 | atomic_dec(&selinux_secmark_refcount); |
| 4820 | } |
| 4821 | |
Adrian Bunk | 9a673e5 | 2006-08-15 00:03:53 -0700 | [diff] [blame] | 4822 | static void selinux_req_classify_flow(const struct request_sock *req, |
| 4823 | struct flowi *fl) |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 4824 | { |
David S. Miller | 1d28f42 | 2011-03-12 00:29:39 -0500 | [diff] [blame] | 4825 | fl->flowi_secid = req->secid; |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 4826 | } |
| 4827 | |
Paul Moore | 5dbbaf2 | 2013-01-14 07:12:19 +0000 | [diff] [blame] | 4828 | static int selinux_tun_dev_alloc_security(void **security) |
| 4829 | { |
| 4830 | struct tun_security_struct *tunsec; |
| 4831 | |
| 4832 | tunsec = kzalloc(sizeof(*tunsec), GFP_KERNEL); |
| 4833 | if (!tunsec) |
| 4834 | return -ENOMEM; |
| 4835 | tunsec->sid = current_sid(); |
| 4836 | |
| 4837 | *security = tunsec; |
| 4838 | return 0; |
| 4839 | } |
| 4840 | |
| 4841 | static void selinux_tun_dev_free_security(void *security) |
| 4842 | { |
| 4843 | kfree(security); |
| 4844 | } |
| 4845 | |
Paul Moore | ed6d76e | 2009-08-28 18:12:49 -0400 | [diff] [blame] | 4846 | static int selinux_tun_dev_create(void) |
| 4847 | { |
| 4848 | u32 sid = current_sid(); |
| 4849 | |
| 4850 | /* we aren't taking into account the "sockcreate" SID since the socket |
| 4851 | * that is being created here is not a socket in the traditional sense, |
| 4852 | * instead it is a private sock, accessible only to the kernel, and |
| 4853 | * representing a wide range of network traffic spanning multiple |
| 4854 | * connections unlike traditional sockets - check the TUN driver to |
| 4855 | * get a better understanding of why this socket is special */ |
| 4856 | |
| 4857 | return avc_has_perm(sid, sid, SECCLASS_TUN_SOCKET, TUN_SOCKET__CREATE, |
| 4858 | NULL); |
| 4859 | } |
| 4860 | |
Paul Moore | 5dbbaf2 | 2013-01-14 07:12:19 +0000 | [diff] [blame] | 4861 | static int selinux_tun_dev_attach_queue(void *security) |
Paul Moore | ed6d76e | 2009-08-28 18:12:49 -0400 | [diff] [blame] | 4862 | { |
Paul Moore | 5dbbaf2 | 2013-01-14 07:12:19 +0000 | [diff] [blame] | 4863 | struct tun_security_struct *tunsec = security; |
| 4864 | |
| 4865 | return avc_has_perm(current_sid(), tunsec->sid, SECCLASS_TUN_SOCKET, |
| 4866 | TUN_SOCKET__ATTACH_QUEUE, NULL); |
| 4867 | } |
| 4868 | |
| 4869 | static int selinux_tun_dev_attach(struct sock *sk, void *security) |
| 4870 | { |
| 4871 | struct tun_security_struct *tunsec = security; |
Paul Moore | ed6d76e | 2009-08-28 18:12:49 -0400 | [diff] [blame] | 4872 | struct sk_security_struct *sksec = sk->sk_security; |
| 4873 | |
| 4874 | /* we don't currently perform any NetLabel based labeling here and it |
| 4875 | * isn't clear that we would want to do so anyway; while we could apply |
| 4876 | * labeling without the support of the TUN user the resulting labeled |
| 4877 | * traffic from the other end of the connection would almost certainly |
| 4878 | * cause confusion to the TUN user that had no idea network labeling |
| 4879 | * protocols were being used */ |
| 4880 | |
Paul Moore | 5dbbaf2 | 2013-01-14 07:12:19 +0000 | [diff] [blame] | 4881 | sksec->sid = tunsec->sid; |
Paul Moore | ed6d76e | 2009-08-28 18:12:49 -0400 | [diff] [blame] | 4882 | sksec->sclass = SECCLASS_TUN_SOCKET; |
Paul Moore | 5dbbaf2 | 2013-01-14 07:12:19 +0000 | [diff] [blame] | 4883 | |
| 4884 | return 0; |
Paul Moore | ed6d76e | 2009-08-28 18:12:49 -0400 | [diff] [blame] | 4885 | } |
| 4886 | |
Paul Moore | 5dbbaf2 | 2013-01-14 07:12:19 +0000 | [diff] [blame] | 4887 | static int selinux_tun_dev_open(void *security) |
Paul Moore | ed6d76e | 2009-08-28 18:12:49 -0400 | [diff] [blame] | 4888 | { |
Paul Moore | 5dbbaf2 | 2013-01-14 07:12:19 +0000 | [diff] [blame] | 4889 | struct tun_security_struct *tunsec = security; |
Paul Moore | ed6d76e | 2009-08-28 18:12:49 -0400 | [diff] [blame] | 4890 | u32 sid = current_sid(); |
| 4891 | int err; |
| 4892 | |
Paul Moore | 5dbbaf2 | 2013-01-14 07:12:19 +0000 | [diff] [blame] | 4893 | err = avc_has_perm(sid, tunsec->sid, SECCLASS_TUN_SOCKET, |
Paul Moore | ed6d76e | 2009-08-28 18:12:49 -0400 | [diff] [blame] | 4894 | TUN_SOCKET__RELABELFROM, NULL); |
| 4895 | if (err) |
| 4896 | return err; |
| 4897 | err = avc_has_perm(sid, sid, SECCLASS_TUN_SOCKET, |
| 4898 | TUN_SOCKET__RELABELTO, NULL); |
| 4899 | if (err) |
| 4900 | return err; |
Paul Moore | 5dbbaf2 | 2013-01-14 07:12:19 +0000 | [diff] [blame] | 4901 | tunsec->sid = sid; |
Paul Moore | ed6d76e | 2009-08-28 18:12:49 -0400 | [diff] [blame] | 4902 | |
| 4903 | return 0; |
| 4904 | } |
| 4905 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4906 | static int selinux_nlmsg_perm(struct sock *sk, struct sk_buff *skb) |
| 4907 | { |
| 4908 | int err = 0; |
| 4909 | u32 perm; |
| 4910 | struct nlmsghdr *nlh; |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 4911 | struct sk_security_struct *sksec = sk->sk_security; |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 4912 | |
Hong zhi guo | 7795498 | 2013-03-27 06:49:35 +0000 | [diff] [blame] | 4913 | if (skb->len < NLMSG_HDRLEN) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4914 | err = -EINVAL; |
| 4915 | goto out; |
| 4916 | } |
Arnaldo Carvalho de Melo | b529ccf | 2007-04-25 19:08:35 -0700 | [diff] [blame] | 4917 | nlh = nlmsg_hdr(skb); |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 4918 | |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 4919 | err = selinux_nlmsg_lookup(sksec->sclass, nlh->nlmsg_type, &perm); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4920 | if (err) { |
| 4921 | if (err == -EINVAL) { |
Vladis Dronov | 7631994 | 2015-12-24 11:09:41 -0500 | [diff] [blame] | 4922 | pr_warn_ratelimited("SELinux: unrecognized netlink" |
| 4923 | " message: protocol=%hu nlmsg_type=%hu sclass=%s" |
| 4924 | " pig=%d comm=%s\n", |
Marek Milkovic | cded3ff | 2015-06-04 16:22:16 -0400 | [diff] [blame] | 4925 | sk->sk_protocol, nlh->nlmsg_type, |
Vladis Dronov | 7631994 | 2015-12-24 11:09:41 -0500 | [diff] [blame] | 4926 | secclass_map[sksec->sclass - 1].name, |
| 4927 | task_pid_nr(current), current->comm); |
Eric Paris | 39c9aed | 2008-11-05 09:34:42 -0500 | [diff] [blame] | 4928 | if (!selinux_enforcing || security_get_allow_unknown()) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4929 | err = 0; |
| 4930 | } |
| 4931 | |
| 4932 | /* Ignore */ |
| 4933 | if (err == -ENOENT) |
| 4934 | err = 0; |
| 4935 | goto out; |
| 4936 | } |
| 4937 | |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 4938 | err = sock_has_perm(current, sk, perm); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4939 | out: |
| 4940 | return err; |
| 4941 | } |
| 4942 | |
| 4943 | #ifdef CONFIG_NETFILTER |
| 4944 | |
Paul Moore | cbe0d6e | 2014-09-10 17:09:57 -0400 | [diff] [blame] | 4945 | static unsigned int selinux_ip_forward(struct sk_buff *skb, |
| 4946 | const struct net_device *indev, |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4947 | u16 family) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4948 | { |
Paul Moore | dfaebe9 | 2008-10-10 10:16:31 -0400 | [diff] [blame] | 4949 | int err; |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4950 | char *addrp; |
| 4951 | u32 peer_sid; |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 4952 | struct common_audit_data ad; |
Eric Paris | 48c62af | 2012-04-02 13:15:44 -0400 | [diff] [blame] | 4953 | struct lsm_network_audit net = {0,}; |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4954 | u8 secmark_active; |
Paul Moore | 948bf85 | 2008-10-10 10:16:32 -0400 | [diff] [blame] | 4955 | u8 netlbl_active; |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4956 | u8 peerlbl_active; |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 4957 | |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4958 | if (!selinux_policycap_netpeer) |
| 4959 | return NF_ACCEPT; |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 4960 | |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4961 | secmark_active = selinux_secmark_enabled(); |
Paul Moore | 948bf85 | 2008-10-10 10:16:32 -0400 | [diff] [blame] | 4962 | netlbl_active = netlbl_enabled(); |
Chris PeBenito | 2be4d74 | 2013-05-03 09:05:39 -0400 | [diff] [blame] | 4963 | peerlbl_active = selinux_peerlbl_enabled(); |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4964 | if (!secmark_active && !peerlbl_active) |
| 4965 | return NF_ACCEPT; |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 4966 | |
Paul Moore | d8395c8 | 2008-10-10 10:16:30 -0400 | [diff] [blame] | 4967 | if (selinux_skb_peerlbl_sid(skb, family, &peer_sid) != 0) |
| 4968 | return NF_DROP; |
| 4969 | |
Eric Paris | 50c205f | 2012-04-04 15:01:43 -0400 | [diff] [blame] | 4970 | ad.type = LSM_AUDIT_DATA_NET; |
Eric Paris | 48c62af | 2012-04-02 13:15:44 -0400 | [diff] [blame] | 4971 | ad.u.net = &net; |
Paul Moore | cbe0d6e | 2014-09-10 17:09:57 -0400 | [diff] [blame] | 4972 | ad.u.net->netif = indev->ifindex; |
Eric Paris | 48c62af | 2012-04-02 13:15:44 -0400 | [diff] [blame] | 4973 | ad.u.net->family = family; |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4974 | if (selinux_parse_skb(skb, &ad, &addrp, 1, NULL) != 0) |
| 4975 | return NF_DROP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4976 | |
Paul Moore | dfaebe9 | 2008-10-10 10:16:31 -0400 | [diff] [blame] | 4977 | if (peerlbl_active) { |
Paul Moore | cbe0d6e | 2014-09-10 17:09:57 -0400 | [diff] [blame] | 4978 | err = selinux_inet_sys_rcv_skb(dev_net(indev), indev->ifindex, |
| 4979 | addrp, family, peer_sid, &ad); |
Paul Moore | dfaebe9 | 2008-10-10 10:16:31 -0400 | [diff] [blame] | 4980 | if (err) { |
| 4981 | selinux_netlbl_err(skb, err, 1); |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4982 | return NF_DROP; |
Paul Moore | dfaebe9 | 2008-10-10 10:16:31 -0400 | [diff] [blame] | 4983 | } |
| 4984 | } |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4985 | |
| 4986 | if (secmark_active) |
| 4987 | if (avc_has_perm(peer_sid, skb->secmark, |
| 4988 | SECCLASS_PACKET, PACKET__FORWARD_IN, &ad)) |
| 4989 | return NF_DROP; |
| 4990 | |
Paul Moore | 948bf85 | 2008-10-10 10:16:32 -0400 | [diff] [blame] | 4991 | if (netlbl_active) |
| 4992 | /* we do this in the FORWARD path and not the POST_ROUTING |
| 4993 | * path because we want to make sure we apply the necessary |
| 4994 | * labeling before IPsec is applied so we can leverage AH |
| 4995 | * protection */ |
| 4996 | if (selinux_netlbl_skbuff_setsid(skb, family, peer_sid) != 0) |
| 4997 | return NF_DROP; |
| 4998 | |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4999 | return NF_ACCEPT; |
| 5000 | } |
| 5001 | |
Eric W. Biederman | 06198b3 | 2015-09-18 14:33:06 -0500 | [diff] [blame] | 5002 | static unsigned int selinux_ipv4_forward(void *priv, |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 5003 | struct sk_buff *skb, |
David S. Miller | 238e54c | 2015-04-03 20:32:56 -0400 | [diff] [blame] | 5004 | const struct nf_hook_state *state) |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 5005 | { |
David S. Miller | 238e54c | 2015-04-03 20:32:56 -0400 | [diff] [blame] | 5006 | return selinux_ip_forward(skb, state->in, PF_INET); |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 5007 | } |
| 5008 | |
| 5009 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
Eric W. Biederman | 06198b3 | 2015-09-18 14:33:06 -0500 | [diff] [blame] | 5010 | static unsigned int selinux_ipv6_forward(void *priv, |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 5011 | struct sk_buff *skb, |
David S. Miller | 238e54c | 2015-04-03 20:32:56 -0400 | [diff] [blame] | 5012 | const struct nf_hook_state *state) |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 5013 | { |
David S. Miller | 238e54c | 2015-04-03 20:32:56 -0400 | [diff] [blame] | 5014 | return selinux_ip_forward(skb, state->in, PF_INET6); |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 5015 | } |
| 5016 | #endif /* IPV6 */ |
| 5017 | |
Paul Moore | 948bf85 | 2008-10-10 10:16:32 -0400 | [diff] [blame] | 5018 | static unsigned int selinux_ip_output(struct sk_buff *skb, |
| 5019 | u16 family) |
| 5020 | { |
Paul Moore | 4718006 | 2013-12-04 16:10:45 -0500 | [diff] [blame] | 5021 | struct sock *sk; |
Paul Moore | 948bf85 | 2008-10-10 10:16:32 -0400 | [diff] [blame] | 5022 | u32 sid; |
| 5023 | |
| 5024 | if (!netlbl_enabled()) |
| 5025 | return NF_ACCEPT; |
| 5026 | |
| 5027 | /* we do this in the LOCAL_OUT path and not the POST_ROUTING path |
| 5028 | * because we want to make sure we apply the necessary labeling |
| 5029 | * before IPsec is applied so we can leverage AH protection */ |
Paul Moore | 4718006 | 2013-12-04 16:10:45 -0500 | [diff] [blame] | 5030 | sk = skb->sk; |
| 5031 | if (sk) { |
| 5032 | struct sk_security_struct *sksec; |
| 5033 | |
Eric Dumazet | e446f9d | 2015-10-08 05:01:55 -0700 | [diff] [blame] | 5034 | if (sk_listener(sk)) |
Paul Moore | 4718006 | 2013-12-04 16:10:45 -0500 | [diff] [blame] | 5035 | /* if the socket is the listening state then this |
| 5036 | * packet is a SYN-ACK packet which means it needs to |
| 5037 | * be labeled based on the connection/request_sock and |
| 5038 | * not the parent socket. unfortunately, we can't |
| 5039 | * lookup the request_sock yet as it isn't queued on |
| 5040 | * the parent socket until after the SYN-ACK is sent. |
| 5041 | * the "solution" is to simply pass the packet as-is |
| 5042 | * as any IP option based labeling should be copied |
| 5043 | * from the initial connection request (in the IP |
| 5044 | * layer). it is far from ideal, but until we get a |
| 5045 | * security label in the packet itself this is the |
| 5046 | * best we can do. */ |
| 5047 | return NF_ACCEPT; |
| 5048 | |
| 5049 | /* standard practice, label using the parent socket */ |
| 5050 | sksec = sk->sk_security; |
Paul Moore | 948bf85 | 2008-10-10 10:16:32 -0400 | [diff] [blame] | 5051 | sid = sksec->sid; |
| 5052 | } else |
| 5053 | sid = SECINITSID_KERNEL; |
| 5054 | if (selinux_netlbl_skbuff_setsid(skb, family, sid) != 0) |
| 5055 | return NF_DROP; |
| 5056 | |
| 5057 | return NF_ACCEPT; |
| 5058 | } |
| 5059 | |
Eric W. Biederman | 06198b3 | 2015-09-18 14:33:06 -0500 | [diff] [blame] | 5060 | static unsigned int selinux_ipv4_output(void *priv, |
Paul Moore | 948bf85 | 2008-10-10 10:16:32 -0400 | [diff] [blame] | 5061 | struct sk_buff *skb, |
David S. Miller | 238e54c | 2015-04-03 20:32:56 -0400 | [diff] [blame] | 5062 | const struct nf_hook_state *state) |
Paul Moore | 948bf85 | 2008-10-10 10:16:32 -0400 | [diff] [blame] | 5063 | { |
| 5064 | return selinux_ip_output(skb, PF_INET); |
| 5065 | } |
| 5066 | |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 5067 | static unsigned int selinux_ip_postroute_compat(struct sk_buff *skb, |
| 5068 | int ifindex, |
Paul Moore | d8395c8 | 2008-10-10 10:16:30 -0400 | [diff] [blame] | 5069 | u16 family) |
James Morris | 4e5ab4c | 2006-06-09 00:33:33 -0700 | [diff] [blame] | 5070 | { |
Eric Dumazet | 54abc68 | 2015-11-08 10:54:07 -0800 | [diff] [blame] | 5071 | struct sock *sk = skb_to_full_sk(skb); |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 5072 | struct sk_security_struct *sksec; |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 5073 | struct common_audit_data ad; |
Eric Paris | 48c62af | 2012-04-02 13:15:44 -0400 | [diff] [blame] | 5074 | struct lsm_network_audit net = {0,}; |
Paul Moore | d8395c8 | 2008-10-10 10:16:30 -0400 | [diff] [blame] | 5075 | char *addrp; |
| 5076 | u8 proto; |
James Morris | 4e5ab4c | 2006-06-09 00:33:33 -0700 | [diff] [blame] | 5077 | |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 5078 | if (sk == NULL) |
| 5079 | return NF_ACCEPT; |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 5080 | sksec = sk->sk_security; |
James Morris | 4e5ab4c | 2006-06-09 00:33:33 -0700 | [diff] [blame] | 5081 | |
Eric Paris | 50c205f | 2012-04-04 15:01:43 -0400 | [diff] [blame] | 5082 | ad.type = LSM_AUDIT_DATA_NET; |
Eric Paris | 48c62af | 2012-04-02 13:15:44 -0400 | [diff] [blame] | 5083 | ad.u.net = &net; |
| 5084 | ad.u.net->netif = ifindex; |
| 5085 | ad.u.net->family = family; |
Paul Moore | d8395c8 | 2008-10-10 10:16:30 -0400 | [diff] [blame] | 5086 | if (selinux_parse_skb(skb, &ad, &addrp, 0, &proto)) |
| 5087 | return NF_DROP; |
| 5088 | |
Paul Moore | 58bfbb5 | 2009-03-27 17:10:41 -0400 | [diff] [blame] | 5089 | if (selinux_secmark_enabled()) |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 5090 | if (avc_has_perm(sksec->sid, skb->secmark, |
Paul Moore | d8395c8 | 2008-10-10 10:16:30 -0400 | [diff] [blame] | 5091 | SECCLASS_PACKET, PACKET__SEND, &ad)) |
Eric Paris | 2fe66ec | 2010-11-23 06:28:08 +0000 | [diff] [blame] | 5092 | return NF_DROP_ERR(-ECONNREFUSED); |
James Morris | 4e5ab4c | 2006-06-09 00:33:33 -0700 | [diff] [blame] | 5093 | |
Steffen Klassert | b9679a7 | 2011-02-23 12:55:21 +0100 | [diff] [blame] | 5094 | if (selinux_xfrm_postroute_last(sksec->sid, skb, &ad, proto)) |
| 5095 | return NF_DROP_ERR(-ECONNREFUSED); |
James Morris | 4e5ab4c | 2006-06-09 00:33:33 -0700 | [diff] [blame] | 5096 | |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 5097 | return NF_ACCEPT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5098 | } |
| 5099 | |
Paul Moore | cbe0d6e | 2014-09-10 17:09:57 -0400 | [diff] [blame] | 5100 | static unsigned int selinux_ip_postroute(struct sk_buff *skb, |
| 5101 | const struct net_device *outdev, |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 5102 | u16 family) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5103 | { |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 5104 | u32 secmark_perm; |
| 5105 | u32 peer_sid; |
Paul Moore | cbe0d6e | 2014-09-10 17:09:57 -0400 | [diff] [blame] | 5106 | int ifindex = outdev->ifindex; |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 5107 | struct sock *sk; |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 5108 | struct common_audit_data ad; |
Eric Paris | 48c62af | 2012-04-02 13:15:44 -0400 | [diff] [blame] | 5109 | struct lsm_network_audit net = {0,}; |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 5110 | char *addrp; |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 5111 | u8 secmark_active; |
| 5112 | u8 peerlbl_active; |
| 5113 | |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 5114 | /* If any sort of compatibility mode is enabled then handoff processing |
| 5115 | * to the selinux_ip_postroute_compat() function to deal with the |
| 5116 | * special handling. We do this in an attempt to keep this function |
| 5117 | * as fast and as clean as possible. */ |
Paul Moore | 58bfbb5 | 2009-03-27 17:10:41 -0400 | [diff] [blame] | 5118 | if (!selinux_policycap_netpeer) |
Paul Moore | d8395c8 | 2008-10-10 10:16:30 -0400 | [diff] [blame] | 5119 | return selinux_ip_postroute_compat(skb, ifindex, family); |
Paul Moore | c0828e5 | 2013-12-10 14:58:01 -0500 | [diff] [blame] | 5120 | |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 5121 | secmark_active = selinux_secmark_enabled(); |
Chris PeBenito | 2be4d74 | 2013-05-03 09:05:39 -0400 | [diff] [blame] | 5122 | peerlbl_active = selinux_peerlbl_enabled(); |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 5123 | if (!secmark_active && !peerlbl_active) |
| 5124 | return NF_ACCEPT; |
| 5125 | |
Eric Dumazet | 54abc68 | 2015-11-08 10:54:07 -0800 | [diff] [blame] | 5126 | sk = skb_to_full_sk(skb); |
Paul Moore | c0828e5 | 2013-12-10 14:58:01 -0500 | [diff] [blame] | 5127 | |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 5128 | #ifdef CONFIG_XFRM |
| 5129 | /* If skb->dst->xfrm is non-NULL then the packet is undergoing an IPsec |
| 5130 | * packet transformation so allow the packet to pass without any checks |
| 5131 | * since we'll have another chance to perform access control checks |
| 5132 | * when the packet is on it's final way out. |
| 5133 | * NOTE: there appear to be some IPv6 multicast cases where skb->dst |
Paul Moore | c0828e5 | 2013-12-10 14:58:01 -0500 | [diff] [blame] | 5134 | * is NULL, in this case go ahead and apply access control. |
| 5135 | * NOTE: if this is a local socket (skb->sk != NULL) that is in the |
| 5136 | * TCP listening state we cannot wait until the XFRM processing |
| 5137 | * is done as we will miss out on the SA label if we do; |
| 5138 | * unfortunately, this means more work, but it is only once per |
| 5139 | * connection. */ |
| 5140 | if (skb_dst(skb) != NULL && skb_dst(skb)->xfrm != NULL && |
Eric Dumazet | e446f9d | 2015-10-08 05:01:55 -0700 | [diff] [blame] | 5141 | !(sk && sk_listener(sk))) |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 5142 | return NF_ACCEPT; |
| 5143 | #endif |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 5144 | |
Paul Moore | d8395c8 | 2008-10-10 10:16:30 -0400 | [diff] [blame] | 5145 | if (sk == NULL) { |
Paul Moore | 446b802 | 2013-12-04 16:10:51 -0500 | [diff] [blame] | 5146 | /* Without an associated socket the packet is either coming |
| 5147 | * from the kernel or it is being forwarded; check the packet |
| 5148 | * to determine which and if the packet is being forwarded |
| 5149 | * query the packet directly to determine the security label. */ |
Steffen Klassert | 4a7ab3d | 2011-02-23 12:56:23 +0100 | [diff] [blame] | 5150 | if (skb->skb_iif) { |
| 5151 | secmark_perm = PACKET__FORWARD_OUT; |
Paul Moore | d8395c8 | 2008-10-10 10:16:30 -0400 | [diff] [blame] | 5152 | if (selinux_skb_peerlbl_sid(skb, family, &peer_sid)) |
Eric Paris | 04f6d70 | 2010-11-23 06:28:02 +0000 | [diff] [blame] | 5153 | return NF_DROP; |
Steffen Klassert | 4a7ab3d | 2011-02-23 12:56:23 +0100 | [diff] [blame] | 5154 | } else { |
| 5155 | secmark_perm = PACKET__SEND; |
Paul Moore | d8395c8 | 2008-10-10 10:16:30 -0400 | [diff] [blame] | 5156 | peer_sid = SECINITSID_KERNEL; |
Steffen Klassert | 4a7ab3d | 2011-02-23 12:56:23 +0100 | [diff] [blame] | 5157 | } |
Eric Dumazet | e446f9d | 2015-10-08 05:01:55 -0700 | [diff] [blame] | 5158 | } else if (sk_listener(sk)) { |
Paul Moore | 446b802 | 2013-12-04 16:10:51 -0500 | [diff] [blame] | 5159 | /* Locally generated packet but the associated socket is in the |
| 5160 | * listening state which means this is a SYN-ACK packet. In |
| 5161 | * this particular case the correct security label is assigned |
| 5162 | * to the connection/request_sock but unfortunately we can't |
| 5163 | * query the request_sock as it isn't queued on the parent |
| 5164 | * socket until after the SYN-ACK packet is sent; the only |
| 5165 | * viable choice is to regenerate the label like we do in |
| 5166 | * selinux_inet_conn_request(). See also selinux_ip_output() |
| 5167 | * for similar problems. */ |
| 5168 | u32 skb_sid; |
Eric Dumazet | e446f9d | 2015-10-08 05:01:55 -0700 | [diff] [blame] | 5169 | struct sk_security_struct *sksec; |
| 5170 | |
Eric Dumazet | e446f9d | 2015-10-08 05:01:55 -0700 | [diff] [blame] | 5171 | sksec = sk->sk_security; |
Paul Moore | 446b802 | 2013-12-04 16:10:51 -0500 | [diff] [blame] | 5172 | if (selinux_skb_peerlbl_sid(skb, family, &skb_sid)) |
| 5173 | return NF_DROP; |
Paul Moore | c0828e5 | 2013-12-10 14:58:01 -0500 | [diff] [blame] | 5174 | /* At this point, if the returned skb peerlbl is SECSID_NULL |
| 5175 | * and the packet has been through at least one XFRM |
| 5176 | * transformation then we must be dealing with the "final" |
| 5177 | * form of labeled IPsec packet; since we've already applied |
| 5178 | * all of our access controls on this packet we can safely |
| 5179 | * pass the packet. */ |
| 5180 | if (skb_sid == SECSID_NULL) { |
| 5181 | switch (family) { |
| 5182 | case PF_INET: |
| 5183 | if (IPCB(skb)->flags & IPSKB_XFRM_TRANSFORMED) |
| 5184 | return NF_ACCEPT; |
| 5185 | break; |
| 5186 | case PF_INET6: |
| 5187 | if (IP6CB(skb)->flags & IP6SKB_XFRM_TRANSFORMED) |
| 5188 | return NF_ACCEPT; |
Paul Moore | a7a91a1 | 2014-09-03 10:51:59 -0400 | [diff] [blame] | 5189 | break; |
Paul Moore | c0828e5 | 2013-12-10 14:58:01 -0500 | [diff] [blame] | 5190 | default: |
| 5191 | return NF_DROP_ERR(-ECONNREFUSED); |
| 5192 | } |
| 5193 | } |
Paul Moore | 446b802 | 2013-12-04 16:10:51 -0500 | [diff] [blame] | 5194 | if (selinux_conn_sid(sksec->sid, skb_sid, &peer_sid)) |
| 5195 | return NF_DROP; |
| 5196 | secmark_perm = PACKET__SEND; |
Paul Moore | d8395c8 | 2008-10-10 10:16:30 -0400 | [diff] [blame] | 5197 | } else { |
Paul Moore | 446b802 | 2013-12-04 16:10:51 -0500 | [diff] [blame] | 5198 | /* Locally generated packet, fetch the security label from the |
| 5199 | * associated socket. */ |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 5200 | struct sk_security_struct *sksec = sk->sk_security; |
| 5201 | peer_sid = sksec->sid; |
| 5202 | secmark_perm = PACKET__SEND; |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 5203 | } |
| 5204 | |
Eric Paris | 50c205f | 2012-04-04 15:01:43 -0400 | [diff] [blame] | 5205 | ad.type = LSM_AUDIT_DATA_NET; |
Eric Paris | 48c62af | 2012-04-02 13:15:44 -0400 | [diff] [blame] | 5206 | ad.u.net = &net; |
| 5207 | ad.u.net->netif = ifindex; |
| 5208 | ad.u.net->family = family; |
Paul Moore | d8395c8 | 2008-10-10 10:16:30 -0400 | [diff] [blame] | 5209 | if (selinux_parse_skb(skb, &ad, &addrp, 0, NULL)) |
Eric Paris | 04f6d70 | 2010-11-23 06:28:02 +0000 | [diff] [blame] | 5210 | return NF_DROP; |
Paul Moore | d8395c8 | 2008-10-10 10:16:30 -0400 | [diff] [blame] | 5211 | |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 5212 | if (secmark_active) |
| 5213 | if (avc_has_perm(peer_sid, skb->secmark, |
| 5214 | SECCLASS_PACKET, secmark_perm, &ad)) |
Eric Paris | 1f1aaf8 | 2010-11-16 11:52:57 +0000 | [diff] [blame] | 5215 | return NF_DROP_ERR(-ECONNREFUSED); |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 5216 | |
| 5217 | if (peerlbl_active) { |
| 5218 | u32 if_sid; |
| 5219 | u32 node_sid; |
| 5220 | |
Paul Moore | cbe0d6e | 2014-09-10 17:09:57 -0400 | [diff] [blame] | 5221 | if (sel_netif_sid(dev_net(outdev), ifindex, &if_sid)) |
Eric Paris | 04f6d70 | 2010-11-23 06:28:02 +0000 | [diff] [blame] | 5222 | return NF_DROP; |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 5223 | if (avc_has_perm(peer_sid, if_sid, |
| 5224 | SECCLASS_NETIF, NETIF__EGRESS, &ad)) |
Eric Paris | 1f1aaf8 | 2010-11-16 11:52:57 +0000 | [diff] [blame] | 5225 | return NF_DROP_ERR(-ECONNREFUSED); |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 5226 | |
| 5227 | if (sel_netnode_sid(addrp, family, &node_sid)) |
Eric Paris | 04f6d70 | 2010-11-23 06:28:02 +0000 | [diff] [blame] | 5228 | return NF_DROP; |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 5229 | if (avc_has_perm(peer_sid, node_sid, |
| 5230 | SECCLASS_NODE, NODE__SENDTO, &ad)) |
Eric Paris | 1f1aaf8 | 2010-11-16 11:52:57 +0000 | [diff] [blame] | 5231 | return NF_DROP_ERR(-ECONNREFUSED); |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 5232 | } |
| 5233 | |
| 5234 | return NF_ACCEPT; |
| 5235 | } |
| 5236 | |
Eric W. Biederman | 06198b3 | 2015-09-18 14:33:06 -0500 | [diff] [blame] | 5237 | static unsigned int selinux_ipv4_postroute(void *priv, |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 5238 | struct sk_buff *skb, |
David S. Miller | 238e54c | 2015-04-03 20:32:56 -0400 | [diff] [blame] | 5239 | const struct nf_hook_state *state) |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 5240 | { |
David S. Miller | 238e54c | 2015-04-03 20:32:56 -0400 | [diff] [blame] | 5241 | return selinux_ip_postroute(skb, state->out, PF_INET); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5242 | } |
| 5243 | |
| 5244 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
Eric W. Biederman | 06198b3 | 2015-09-18 14:33:06 -0500 | [diff] [blame] | 5245 | static unsigned int selinux_ipv6_postroute(void *priv, |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 5246 | struct sk_buff *skb, |
David S. Miller | 238e54c | 2015-04-03 20:32:56 -0400 | [diff] [blame] | 5247 | const struct nf_hook_state *state) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5248 | { |
David S. Miller | 238e54c | 2015-04-03 20:32:56 -0400 | [diff] [blame] | 5249 | return selinux_ip_postroute(skb, state->out, PF_INET6); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5250 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5251 | #endif /* IPV6 */ |
| 5252 | |
| 5253 | #endif /* CONFIG_NETFILTER */ |
| 5254 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5255 | static int selinux_netlink_send(struct sock *sk, struct sk_buff *skb) |
| 5256 | { |
Stephen Smalley | 941fc5b | 2009-10-01 14:48:23 -0400 | [diff] [blame] | 5257 | return selinux_nlmsg_perm(sk, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5258 | } |
| 5259 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5260 | static int ipc_alloc_security(struct task_struct *task, |
| 5261 | struct kern_ipc_perm *perm, |
| 5262 | u16 sclass) |
| 5263 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5264 | struct ipc_security_struct *isec; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5265 | u32 sid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5266 | |
James Morris | 89d155e | 2005-10-30 14:59:21 -0800 | [diff] [blame] | 5267 | isec = kzalloc(sizeof(struct ipc_security_struct), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5268 | if (!isec) |
| 5269 | return -ENOMEM; |
| 5270 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5271 | sid = task_sid(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5272 | isec->sclass = sclass; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5273 | isec->sid = sid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5274 | perm->security = isec; |
| 5275 | |
| 5276 | return 0; |
| 5277 | } |
| 5278 | |
| 5279 | static void ipc_free_security(struct kern_ipc_perm *perm) |
| 5280 | { |
| 5281 | struct ipc_security_struct *isec = perm->security; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5282 | perm->security = NULL; |
| 5283 | kfree(isec); |
| 5284 | } |
| 5285 | |
| 5286 | static int msg_msg_alloc_security(struct msg_msg *msg) |
| 5287 | { |
| 5288 | struct msg_security_struct *msec; |
| 5289 | |
James Morris | 89d155e | 2005-10-30 14:59:21 -0800 | [diff] [blame] | 5290 | msec = kzalloc(sizeof(struct msg_security_struct), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5291 | if (!msec) |
| 5292 | return -ENOMEM; |
| 5293 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5294 | msec->sid = SECINITSID_UNLABELED; |
| 5295 | msg->security = msec; |
| 5296 | |
| 5297 | return 0; |
| 5298 | } |
| 5299 | |
| 5300 | static void msg_msg_free_security(struct msg_msg *msg) |
| 5301 | { |
| 5302 | struct msg_security_struct *msec = msg->security; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5303 | |
| 5304 | msg->security = NULL; |
| 5305 | kfree(msec); |
| 5306 | } |
| 5307 | |
| 5308 | static int ipc_has_perm(struct kern_ipc_perm *ipc_perms, |
Stephen Smalley | 6af963f | 2005-05-01 08:58:39 -0700 | [diff] [blame] | 5309 | u32 perms) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5310 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5311 | struct ipc_security_struct *isec; |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 5312 | struct common_audit_data ad; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5313 | u32 sid = current_sid(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5314 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5315 | isec = ipc_perms->security; |
| 5316 | |
Eric Paris | 50c205f | 2012-04-04 15:01:43 -0400 | [diff] [blame] | 5317 | ad.type = LSM_AUDIT_DATA_IPC; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5318 | ad.u.ipc_id = ipc_perms->key; |
| 5319 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5320 | return avc_has_perm(sid, isec->sid, isec->sclass, perms, &ad); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5321 | } |
| 5322 | |
| 5323 | static int selinux_msg_msg_alloc_security(struct msg_msg *msg) |
| 5324 | { |
| 5325 | return msg_msg_alloc_security(msg); |
| 5326 | } |
| 5327 | |
| 5328 | static void selinux_msg_msg_free_security(struct msg_msg *msg) |
| 5329 | { |
| 5330 | msg_msg_free_security(msg); |
| 5331 | } |
| 5332 | |
| 5333 | /* message queue security operations */ |
| 5334 | static int selinux_msg_queue_alloc_security(struct msg_queue *msq) |
| 5335 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5336 | struct ipc_security_struct *isec; |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 5337 | struct common_audit_data ad; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5338 | u32 sid = current_sid(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5339 | int rc; |
| 5340 | |
| 5341 | rc = ipc_alloc_security(current, &msq->q_perm, SECCLASS_MSGQ); |
| 5342 | if (rc) |
| 5343 | return rc; |
| 5344 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5345 | isec = msq->q_perm.security; |
| 5346 | |
Eric Paris | 50c205f | 2012-04-04 15:01:43 -0400 | [diff] [blame] | 5347 | ad.type = LSM_AUDIT_DATA_IPC; |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5348 | ad.u.ipc_id = msq->q_perm.key; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5349 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5350 | rc = avc_has_perm(sid, isec->sid, SECCLASS_MSGQ, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5351 | MSGQ__CREATE, &ad); |
| 5352 | if (rc) { |
| 5353 | ipc_free_security(&msq->q_perm); |
| 5354 | return rc; |
| 5355 | } |
| 5356 | return 0; |
| 5357 | } |
| 5358 | |
| 5359 | static void selinux_msg_queue_free_security(struct msg_queue *msq) |
| 5360 | { |
| 5361 | ipc_free_security(&msq->q_perm); |
| 5362 | } |
| 5363 | |
| 5364 | static int selinux_msg_queue_associate(struct msg_queue *msq, int msqflg) |
| 5365 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5366 | struct ipc_security_struct *isec; |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 5367 | struct common_audit_data ad; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5368 | u32 sid = current_sid(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5369 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5370 | isec = msq->q_perm.security; |
| 5371 | |
Eric Paris | 50c205f | 2012-04-04 15:01:43 -0400 | [diff] [blame] | 5372 | ad.type = LSM_AUDIT_DATA_IPC; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5373 | ad.u.ipc_id = msq->q_perm.key; |
| 5374 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5375 | return avc_has_perm(sid, isec->sid, SECCLASS_MSGQ, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5376 | MSGQ__ASSOCIATE, &ad); |
| 5377 | } |
| 5378 | |
| 5379 | static int selinux_msg_queue_msgctl(struct msg_queue *msq, int cmd) |
| 5380 | { |
| 5381 | int err; |
| 5382 | int perms; |
| 5383 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5384 | switch (cmd) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5385 | case IPC_INFO: |
| 5386 | case MSG_INFO: |
| 5387 | /* No specific object, just general system-wide information. */ |
| 5388 | return task_has_system(current, SYSTEM__IPC_INFO); |
| 5389 | case IPC_STAT: |
| 5390 | case MSG_STAT: |
| 5391 | perms = MSGQ__GETATTR | MSGQ__ASSOCIATE; |
| 5392 | break; |
| 5393 | case IPC_SET: |
| 5394 | perms = MSGQ__SETATTR; |
| 5395 | break; |
| 5396 | case IPC_RMID: |
| 5397 | perms = MSGQ__DESTROY; |
| 5398 | break; |
| 5399 | default: |
| 5400 | return 0; |
| 5401 | } |
| 5402 | |
Stephen Smalley | 6af963f | 2005-05-01 08:58:39 -0700 | [diff] [blame] | 5403 | err = ipc_has_perm(&msq->q_perm, perms); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5404 | return err; |
| 5405 | } |
| 5406 | |
| 5407 | static int selinux_msg_queue_msgsnd(struct msg_queue *msq, struct msg_msg *msg, int msqflg) |
| 5408 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5409 | struct ipc_security_struct *isec; |
| 5410 | struct msg_security_struct *msec; |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 5411 | struct common_audit_data ad; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5412 | u32 sid = current_sid(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5413 | int rc; |
| 5414 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5415 | isec = msq->q_perm.security; |
| 5416 | msec = msg->security; |
| 5417 | |
| 5418 | /* |
| 5419 | * First time through, need to assign label to the message |
| 5420 | */ |
| 5421 | if (msec->sid == SECINITSID_UNLABELED) { |
| 5422 | /* |
| 5423 | * Compute new sid based on current process and |
| 5424 | * message queue this message will be stored in |
| 5425 | */ |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5426 | rc = security_transition_sid(sid, isec->sid, SECCLASS_MSG, |
Eric Paris | 652bb9b | 2011-02-01 11:05:40 -0500 | [diff] [blame] | 5427 | NULL, &msec->sid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5428 | if (rc) |
| 5429 | return rc; |
| 5430 | } |
| 5431 | |
Eric Paris | 50c205f | 2012-04-04 15:01:43 -0400 | [diff] [blame] | 5432 | ad.type = LSM_AUDIT_DATA_IPC; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5433 | ad.u.ipc_id = msq->q_perm.key; |
| 5434 | |
| 5435 | /* Can this process write to the queue? */ |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5436 | rc = avc_has_perm(sid, isec->sid, SECCLASS_MSGQ, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5437 | MSGQ__WRITE, &ad); |
| 5438 | if (!rc) |
| 5439 | /* Can this process send the message */ |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5440 | rc = avc_has_perm(sid, msec->sid, SECCLASS_MSG, |
| 5441 | MSG__SEND, &ad); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5442 | if (!rc) |
| 5443 | /* Can the message be put in the queue? */ |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5444 | rc = avc_has_perm(msec->sid, isec->sid, SECCLASS_MSGQ, |
| 5445 | MSGQ__ENQUEUE, &ad); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5446 | |
| 5447 | return rc; |
| 5448 | } |
| 5449 | |
| 5450 | static int selinux_msg_queue_msgrcv(struct msg_queue *msq, struct msg_msg *msg, |
| 5451 | struct task_struct *target, |
| 5452 | long type, int mode) |
| 5453 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5454 | struct ipc_security_struct *isec; |
| 5455 | struct msg_security_struct *msec; |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 5456 | struct common_audit_data ad; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5457 | u32 sid = task_sid(target); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5458 | int rc; |
| 5459 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5460 | isec = msq->q_perm.security; |
| 5461 | msec = msg->security; |
| 5462 | |
Eric Paris | 50c205f | 2012-04-04 15:01:43 -0400 | [diff] [blame] | 5463 | ad.type = LSM_AUDIT_DATA_IPC; |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5464 | ad.u.ipc_id = msq->q_perm.key; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5465 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5466 | rc = avc_has_perm(sid, isec->sid, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5467 | SECCLASS_MSGQ, MSGQ__READ, &ad); |
| 5468 | if (!rc) |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5469 | rc = avc_has_perm(sid, msec->sid, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5470 | SECCLASS_MSG, MSG__RECEIVE, &ad); |
| 5471 | return rc; |
| 5472 | } |
| 5473 | |
| 5474 | /* Shared Memory security operations */ |
| 5475 | static int selinux_shm_alloc_security(struct shmid_kernel *shp) |
| 5476 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5477 | struct ipc_security_struct *isec; |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 5478 | struct common_audit_data ad; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5479 | u32 sid = current_sid(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5480 | int rc; |
| 5481 | |
| 5482 | rc = ipc_alloc_security(current, &shp->shm_perm, SECCLASS_SHM); |
| 5483 | if (rc) |
| 5484 | return rc; |
| 5485 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5486 | isec = shp->shm_perm.security; |
| 5487 | |
Eric Paris | 50c205f | 2012-04-04 15:01:43 -0400 | [diff] [blame] | 5488 | ad.type = LSM_AUDIT_DATA_IPC; |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5489 | ad.u.ipc_id = shp->shm_perm.key; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5490 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5491 | rc = avc_has_perm(sid, isec->sid, SECCLASS_SHM, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5492 | SHM__CREATE, &ad); |
| 5493 | if (rc) { |
| 5494 | ipc_free_security(&shp->shm_perm); |
| 5495 | return rc; |
| 5496 | } |
| 5497 | return 0; |
| 5498 | } |
| 5499 | |
| 5500 | static void selinux_shm_free_security(struct shmid_kernel *shp) |
| 5501 | { |
| 5502 | ipc_free_security(&shp->shm_perm); |
| 5503 | } |
| 5504 | |
| 5505 | static int selinux_shm_associate(struct shmid_kernel *shp, int shmflg) |
| 5506 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5507 | struct ipc_security_struct *isec; |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 5508 | struct common_audit_data ad; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5509 | u32 sid = current_sid(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5510 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5511 | isec = shp->shm_perm.security; |
| 5512 | |
Eric Paris | 50c205f | 2012-04-04 15:01:43 -0400 | [diff] [blame] | 5513 | ad.type = LSM_AUDIT_DATA_IPC; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5514 | ad.u.ipc_id = shp->shm_perm.key; |
| 5515 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5516 | return avc_has_perm(sid, isec->sid, SECCLASS_SHM, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5517 | SHM__ASSOCIATE, &ad); |
| 5518 | } |
| 5519 | |
| 5520 | /* Note, at this point, shp is locked down */ |
| 5521 | static int selinux_shm_shmctl(struct shmid_kernel *shp, int cmd) |
| 5522 | { |
| 5523 | int perms; |
| 5524 | int err; |
| 5525 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5526 | switch (cmd) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5527 | case IPC_INFO: |
| 5528 | case SHM_INFO: |
| 5529 | /* No specific object, just general system-wide information. */ |
| 5530 | return task_has_system(current, SYSTEM__IPC_INFO); |
| 5531 | case IPC_STAT: |
| 5532 | case SHM_STAT: |
| 5533 | perms = SHM__GETATTR | SHM__ASSOCIATE; |
| 5534 | break; |
| 5535 | case IPC_SET: |
| 5536 | perms = SHM__SETATTR; |
| 5537 | break; |
| 5538 | case SHM_LOCK: |
| 5539 | case SHM_UNLOCK: |
| 5540 | perms = SHM__LOCK; |
| 5541 | break; |
| 5542 | case IPC_RMID: |
| 5543 | perms = SHM__DESTROY; |
| 5544 | break; |
| 5545 | default: |
| 5546 | return 0; |
| 5547 | } |
| 5548 | |
Stephen Smalley | 6af963f | 2005-05-01 08:58:39 -0700 | [diff] [blame] | 5549 | err = ipc_has_perm(&shp->shm_perm, perms); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5550 | return err; |
| 5551 | } |
| 5552 | |
| 5553 | static int selinux_shm_shmat(struct shmid_kernel *shp, |
| 5554 | char __user *shmaddr, int shmflg) |
| 5555 | { |
| 5556 | u32 perms; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5557 | |
| 5558 | if (shmflg & SHM_RDONLY) |
| 5559 | perms = SHM__READ; |
| 5560 | else |
| 5561 | perms = SHM__READ | SHM__WRITE; |
| 5562 | |
Stephen Smalley | 6af963f | 2005-05-01 08:58:39 -0700 | [diff] [blame] | 5563 | return ipc_has_perm(&shp->shm_perm, perms); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5564 | } |
| 5565 | |
| 5566 | /* Semaphore security operations */ |
| 5567 | static int selinux_sem_alloc_security(struct sem_array *sma) |
| 5568 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5569 | struct ipc_security_struct *isec; |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 5570 | struct common_audit_data ad; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5571 | u32 sid = current_sid(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5572 | int rc; |
| 5573 | |
| 5574 | rc = ipc_alloc_security(current, &sma->sem_perm, SECCLASS_SEM); |
| 5575 | if (rc) |
| 5576 | return rc; |
| 5577 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5578 | isec = sma->sem_perm.security; |
| 5579 | |
Eric Paris | 50c205f | 2012-04-04 15:01:43 -0400 | [diff] [blame] | 5580 | ad.type = LSM_AUDIT_DATA_IPC; |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5581 | ad.u.ipc_id = sma->sem_perm.key; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5582 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5583 | rc = avc_has_perm(sid, isec->sid, SECCLASS_SEM, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5584 | SEM__CREATE, &ad); |
| 5585 | if (rc) { |
| 5586 | ipc_free_security(&sma->sem_perm); |
| 5587 | return rc; |
| 5588 | } |
| 5589 | return 0; |
| 5590 | } |
| 5591 | |
| 5592 | static void selinux_sem_free_security(struct sem_array *sma) |
| 5593 | { |
| 5594 | ipc_free_security(&sma->sem_perm); |
| 5595 | } |
| 5596 | |
| 5597 | static int selinux_sem_associate(struct sem_array *sma, int semflg) |
| 5598 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5599 | struct ipc_security_struct *isec; |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 5600 | struct common_audit_data ad; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5601 | u32 sid = current_sid(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5602 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5603 | isec = sma->sem_perm.security; |
| 5604 | |
Eric Paris | 50c205f | 2012-04-04 15:01:43 -0400 | [diff] [blame] | 5605 | ad.type = LSM_AUDIT_DATA_IPC; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5606 | ad.u.ipc_id = sma->sem_perm.key; |
| 5607 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5608 | return avc_has_perm(sid, isec->sid, SECCLASS_SEM, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5609 | SEM__ASSOCIATE, &ad); |
| 5610 | } |
| 5611 | |
| 5612 | /* Note, at this point, sma is locked down */ |
| 5613 | static int selinux_sem_semctl(struct sem_array *sma, int cmd) |
| 5614 | { |
| 5615 | int err; |
| 5616 | u32 perms; |
| 5617 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5618 | switch (cmd) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5619 | case IPC_INFO: |
| 5620 | case SEM_INFO: |
| 5621 | /* No specific object, just general system-wide information. */ |
| 5622 | return task_has_system(current, SYSTEM__IPC_INFO); |
| 5623 | case GETPID: |
| 5624 | case GETNCNT: |
| 5625 | case GETZCNT: |
| 5626 | perms = SEM__GETATTR; |
| 5627 | break; |
| 5628 | case GETVAL: |
| 5629 | case GETALL: |
| 5630 | perms = SEM__READ; |
| 5631 | break; |
| 5632 | case SETVAL: |
| 5633 | case SETALL: |
| 5634 | perms = SEM__WRITE; |
| 5635 | break; |
| 5636 | case IPC_RMID: |
| 5637 | perms = SEM__DESTROY; |
| 5638 | break; |
| 5639 | case IPC_SET: |
| 5640 | perms = SEM__SETATTR; |
| 5641 | break; |
| 5642 | case IPC_STAT: |
| 5643 | case SEM_STAT: |
| 5644 | perms = SEM__GETATTR | SEM__ASSOCIATE; |
| 5645 | break; |
| 5646 | default: |
| 5647 | return 0; |
| 5648 | } |
| 5649 | |
Stephen Smalley | 6af963f | 2005-05-01 08:58:39 -0700 | [diff] [blame] | 5650 | err = ipc_has_perm(&sma->sem_perm, perms); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5651 | return err; |
| 5652 | } |
| 5653 | |
| 5654 | static int selinux_sem_semop(struct sem_array *sma, |
| 5655 | struct sembuf *sops, unsigned nsops, int alter) |
| 5656 | { |
| 5657 | u32 perms; |
| 5658 | |
| 5659 | if (alter) |
| 5660 | perms = SEM__READ | SEM__WRITE; |
| 5661 | else |
| 5662 | perms = SEM__READ; |
| 5663 | |
Stephen Smalley | 6af963f | 2005-05-01 08:58:39 -0700 | [diff] [blame] | 5664 | return ipc_has_perm(&sma->sem_perm, perms); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5665 | } |
| 5666 | |
| 5667 | static int selinux_ipc_permission(struct kern_ipc_perm *ipcp, short flag) |
| 5668 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5669 | u32 av = 0; |
| 5670 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5671 | av = 0; |
| 5672 | if (flag & S_IRUGO) |
| 5673 | av |= IPC__UNIX_READ; |
| 5674 | if (flag & S_IWUGO) |
| 5675 | av |= IPC__UNIX_WRITE; |
| 5676 | |
| 5677 | if (av == 0) |
| 5678 | return 0; |
| 5679 | |
Stephen Smalley | 6af963f | 2005-05-01 08:58:39 -0700 | [diff] [blame] | 5680 | return ipc_has_perm(ipcp, av); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5681 | } |
| 5682 | |
Ahmed S. Darwish | 713a04ae | 2008-03-01 21:52:30 +0200 | [diff] [blame] | 5683 | static void selinux_ipc_getsecid(struct kern_ipc_perm *ipcp, u32 *secid) |
| 5684 | { |
| 5685 | struct ipc_security_struct *isec = ipcp->security; |
| 5686 | *secid = isec->sid; |
| 5687 | } |
| 5688 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5689 | static void selinux_d_instantiate(struct dentry *dentry, struct inode *inode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5690 | { |
| 5691 | if (inode) |
| 5692 | inode_doinit_with_dentry(inode, dentry); |
| 5693 | } |
| 5694 | |
| 5695 | static int selinux_getprocattr(struct task_struct *p, |
Al Viro | 04ff970 | 2007-03-12 16:17:58 +0000 | [diff] [blame] | 5696 | char *name, char **value) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5697 | { |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5698 | const struct task_security_struct *__tsec; |
Dustin Kirkland | 8c8570f | 2005-11-03 17:15:16 +0000 | [diff] [blame] | 5699 | u32 sid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5700 | int error; |
Al Viro | 04ff970 | 2007-03-12 16:17:58 +0000 | [diff] [blame] | 5701 | unsigned len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5702 | |
| 5703 | if (current != p) { |
David Howells | 3b11a1d | 2008-11-14 10:39:26 +1100 | [diff] [blame] | 5704 | error = current_has_perm(p, PROCESS__GETATTR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5705 | if (error) |
| 5706 | return error; |
| 5707 | } |
| 5708 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5709 | rcu_read_lock(); |
| 5710 | __tsec = __task_cred(p)->security; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5711 | |
| 5712 | if (!strcmp(name, "current")) |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5713 | sid = __tsec->sid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5714 | else if (!strcmp(name, "prev")) |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5715 | sid = __tsec->osid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5716 | else if (!strcmp(name, "exec")) |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5717 | sid = __tsec->exec_sid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5718 | else if (!strcmp(name, "fscreate")) |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5719 | sid = __tsec->create_sid; |
Michael LeMay | 4eb582c | 2006-06-26 00:24:57 -0700 | [diff] [blame] | 5720 | else if (!strcmp(name, "keycreate")) |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5721 | sid = __tsec->keycreate_sid; |
Eric Paris | 42c3e03 | 2006-06-26 00:26:03 -0700 | [diff] [blame] | 5722 | else if (!strcmp(name, "sockcreate")) |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5723 | sid = __tsec->sockcreate_sid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5724 | else |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5725 | goto invalid; |
| 5726 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5727 | |
| 5728 | if (!sid) |
| 5729 | return 0; |
| 5730 | |
Al Viro | 04ff970 | 2007-03-12 16:17:58 +0000 | [diff] [blame] | 5731 | error = security_sid_to_context(sid, value, &len); |
| 5732 | if (error) |
| 5733 | return error; |
| 5734 | return len; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5735 | |
| 5736 | invalid: |
| 5737 | rcu_read_unlock(); |
| 5738 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5739 | } |
| 5740 | |
| 5741 | static int selinux_setprocattr(struct task_struct *p, |
| 5742 | char *name, void *value, size_t size) |
| 5743 | { |
| 5744 | struct task_security_struct *tsec; |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 5745 | struct cred *new; |
| 5746 | u32 sid = 0, ptsid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5747 | int error; |
| 5748 | char *str = value; |
| 5749 | |
| 5750 | if (current != p) { |
| 5751 | /* SELinux only allows a process to change its own |
| 5752 | security attributes. */ |
| 5753 | return -EACCES; |
| 5754 | } |
| 5755 | |
| 5756 | /* |
| 5757 | * Basic control over ability to set these attributes at all. |
| 5758 | * current == p, but we'll pass them separately in case the |
| 5759 | * above restriction is ever removed. |
| 5760 | */ |
| 5761 | if (!strcmp(name, "exec")) |
David Howells | 3b11a1d | 2008-11-14 10:39:26 +1100 | [diff] [blame] | 5762 | error = current_has_perm(p, PROCESS__SETEXEC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5763 | else if (!strcmp(name, "fscreate")) |
David Howells | 3b11a1d | 2008-11-14 10:39:26 +1100 | [diff] [blame] | 5764 | error = current_has_perm(p, PROCESS__SETFSCREATE); |
Michael LeMay | 4eb582c | 2006-06-26 00:24:57 -0700 | [diff] [blame] | 5765 | else if (!strcmp(name, "keycreate")) |
David Howells | 3b11a1d | 2008-11-14 10:39:26 +1100 | [diff] [blame] | 5766 | error = current_has_perm(p, PROCESS__SETKEYCREATE); |
Eric Paris | 42c3e03 | 2006-06-26 00:26:03 -0700 | [diff] [blame] | 5767 | else if (!strcmp(name, "sockcreate")) |
David Howells | 3b11a1d | 2008-11-14 10:39:26 +1100 | [diff] [blame] | 5768 | error = current_has_perm(p, PROCESS__SETSOCKCREATE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5769 | else if (!strcmp(name, "current")) |
David Howells | 3b11a1d | 2008-11-14 10:39:26 +1100 | [diff] [blame] | 5770 | error = current_has_perm(p, PROCESS__SETCURRENT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5771 | else |
| 5772 | error = -EINVAL; |
| 5773 | if (error) |
| 5774 | return error; |
| 5775 | |
| 5776 | /* Obtain a SID for the context, if one was specified. */ |
| 5777 | if (size && str[1] && str[1] != '\n') { |
| 5778 | if (str[size-1] == '\n') { |
| 5779 | str[size-1] = 0; |
| 5780 | size--; |
| 5781 | } |
Nikolay Aleksandrov | 52a4c64 | 2014-03-07 12:44:19 +0100 | [diff] [blame] | 5782 | error = security_context_to_sid(value, size, &sid, GFP_KERNEL); |
Stephen Smalley | 12b29f3 | 2008-05-07 13:03:20 -0400 | [diff] [blame] | 5783 | if (error == -EINVAL && !strcmp(name, "fscreate")) { |
Eric Paris | d6ea83e | 2012-04-04 13:45:49 -0400 | [diff] [blame] | 5784 | if (!capable(CAP_MAC_ADMIN)) { |
| 5785 | struct audit_buffer *ab; |
| 5786 | size_t audit_size; |
| 5787 | |
| 5788 | /* We strip a nul only if it is at the end, otherwise the |
| 5789 | * context contains a nul and we should audit that */ |
| 5790 | if (str[size - 1] == '\0') |
| 5791 | audit_size = size - 1; |
| 5792 | else |
| 5793 | audit_size = size; |
| 5794 | ab = audit_log_start(current->audit_context, GFP_ATOMIC, AUDIT_SELINUX_ERR); |
| 5795 | audit_log_format(ab, "op=fscreate invalid_context="); |
| 5796 | audit_log_n_untrustedstring(ab, value, audit_size); |
| 5797 | audit_log_end(ab); |
| 5798 | |
Stephen Smalley | 12b29f3 | 2008-05-07 13:03:20 -0400 | [diff] [blame] | 5799 | return error; |
Eric Paris | d6ea83e | 2012-04-04 13:45:49 -0400 | [diff] [blame] | 5800 | } |
Stephen Smalley | 12b29f3 | 2008-05-07 13:03:20 -0400 | [diff] [blame] | 5801 | error = security_context_to_sid_force(value, size, |
| 5802 | &sid); |
| 5803 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5804 | if (error) |
| 5805 | return error; |
| 5806 | } |
| 5807 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 5808 | new = prepare_creds(); |
| 5809 | if (!new) |
| 5810 | return -ENOMEM; |
| 5811 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5812 | /* Permission checking based on the specified context is |
| 5813 | performed during the actual operation (execve, |
| 5814 | open/mkdir/...), when we know the full context of the |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 5815 | operation. See selinux_bprm_set_creds for the execve |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5816 | checks and may_create for the file creation checks. The |
| 5817 | operation will then fail if the context is not permitted. */ |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 5818 | tsec = new->security; |
| 5819 | if (!strcmp(name, "exec")) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5820 | tsec->exec_sid = sid; |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 5821 | } else if (!strcmp(name, "fscreate")) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5822 | tsec->create_sid = sid; |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 5823 | } else if (!strcmp(name, "keycreate")) { |
Michael LeMay | 4eb582c | 2006-06-26 00:24:57 -0700 | [diff] [blame] | 5824 | error = may_create_key(sid, p); |
| 5825 | if (error) |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 5826 | goto abort_change; |
Michael LeMay | 4eb582c | 2006-06-26 00:24:57 -0700 | [diff] [blame] | 5827 | tsec->keycreate_sid = sid; |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 5828 | } else if (!strcmp(name, "sockcreate")) { |
Eric Paris | 42c3e03 | 2006-06-26 00:26:03 -0700 | [diff] [blame] | 5829 | tsec->sockcreate_sid = sid; |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 5830 | } else if (!strcmp(name, "current")) { |
| 5831 | error = -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5832 | if (sid == 0) |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 5833 | goto abort_change; |
KaiGai Kohei | d9250de | 2008-08-28 16:35:57 +0900 | [diff] [blame] | 5834 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 5835 | /* Only allow single threaded processes to change context */ |
| 5836 | error = -EPERM; |
Oleg Nesterov | 5bb459b | 2009-07-10 03:48:23 +0200 | [diff] [blame] | 5837 | if (!current_is_single_threaded()) { |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 5838 | error = security_bounded_transition(tsec->sid, sid); |
| 5839 | if (error) |
| 5840 | goto abort_change; |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5841 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5842 | |
| 5843 | /* Check permissions for the transition. */ |
| 5844 | error = avc_has_perm(tsec->sid, sid, SECCLASS_PROCESS, |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5845 | PROCESS__DYNTRANSITION, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5846 | if (error) |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 5847 | goto abort_change; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5848 | |
| 5849 | /* Check for ptracing, and update the task SID if ok. |
| 5850 | Otherwise, leave SID unchanged and fail. */ |
Paul Moore | 0c6181c | 2016-03-30 21:41:21 -0400 | [diff] [blame] | 5851 | ptsid = ptrace_parent_sid(p); |
| 5852 | if (ptsid != 0) { |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 5853 | error = avc_has_perm(ptsid, sid, SECCLASS_PROCESS, |
| 5854 | PROCESS__PTRACE, NULL); |
| 5855 | if (error) |
| 5856 | goto abort_change; |
| 5857 | } |
| 5858 | |
| 5859 | tsec->sid = sid; |
| 5860 | } else { |
| 5861 | error = -EINVAL; |
| 5862 | goto abort_change; |
| 5863 | } |
| 5864 | |
| 5865 | commit_creds(new); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5866 | return size; |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 5867 | |
| 5868 | abort_change: |
| 5869 | abort_creds(new); |
| 5870 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5871 | } |
| 5872 | |
David Quigley | 746df9b | 2013-05-22 12:50:35 -0400 | [diff] [blame] | 5873 | static int selinux_ismaclabel(const char *name) |
| 5874 | { |
| 5875 | return (strcmp(name, XATTR_SELINUX_SUFFIX) == 0); |
| 5876 | } |
| 5877 | |
Catherine Zhang | dc49c1f | 2006-08-02 14:12:06 -0700 | [diff] [blame] | 5878 | static int selinux_secid_to_secctx(u32 secid, char **secdata, u32 *seclen) |
| 5879 | { |
| 5880 | return security_sid_to_context(secid, secdata, seclen); |
| 5881 | } |
| 5882 | |
David Howells | 7bf570d | 2008-04-29 20:52:51 +0100 | [diff] [blame] | 5883 | static int selinux_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid) |
David Howells | 63cb344 | 2008-01-15 23:47:35 +0000 | [diff] [blame] | 5884 | { |
Nikolay Aleksandrov | 52a4c64 | 2014-03-07 12:44:19 +0100 | [diff] [blame] | 5885 | return security_context_to_sid(secdata, seclen, secid, GFP_KERNEL); |
David Howells | 63cb344 | 2008-01-15 23:47:35 +0000 | [diff] [blame] | 5886 | } |
| 5887 | |
Catherine Zhang | dc49c1f | 2006-08-02 14:12:06 -0700 | [diff] [blame] | 5888 | static void selinux_release_secctx(char *secdata, u32 seclen) |
| 5889 | { |
Paul Moore | 088999e | 2007-08-01 11:12:58 -0400 | [diff] [blame] | 5890 | kfree(secdata); |
Catherine Zhang | dc49c1f | 2006-08-02 14:12:06 -0700 | [diff] [blame] | 5891 | } |
| 5892 | |
Andreas Gruenbacher | 6f3be9f | 2015-12-24 11:09:40 -0500 | [diff] [blame] | 5893 | static void selinux_inode_invalidate_secctx(struct inode *inode) |
| 5894 | { |
| 5895 | struct inode_security_struct *isec = inode->i_security; |
| 5896 | |
| 5897 | mutex_lock(&isec->lock); |
| 5898 | isec->initialized = LABEL_INVALID; |
| 5899 | mutex_unlock(&isec->lock); |
| 5900 | } |
| 5901 | |
David P. Quigley | 1ee65e3 | 2009-09-03 14:25:57 -0400 | [diff] [blame] | 5902 | /* |
| 5903 | * called with inode->i_mutex locked |
| 5904 | */ |
| 5905 | static int selinux_inode_notifysecctx(struct inode *inode, void *ctx, u32 ctxlen) |
| 5906 | { |
| 5907 | return selinux_inode_setsecurity(inode, XATTR_SELINUX_SUFFIX, ctx, ctxlen, 0); |
| 5908 | } |
| 5909 | |
| 5910 | /* |
| 5911 | * called with inode->i_mutex locked |
| 5912 | */ |
| 5913 | static int selinux_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen) |
| 5914 | { |
| 5915 | return __vfs_setxattr_noperm(dentry, XATTR_NAME_SELINUX, ctx, ctxlen, 0); |
| 5916 | } |
| 5917 | |
| 5918 | static int selinux_inode_getsecctx(struct inode *inode, void **ctx, u32 *ctxlen) |
| 5919 | { |
| 5920 | int len = 0; |
| 5921 | len = selinux_inode_getsecurity(inode, XATTR_SELINUX_SUFFIX, |
| 5922 | ctx, true); |
| 5923 | if (len < 0) |
| 5924 | return len; |
| 5925 | *ctxlen = len; |
| 5926 | return 0; |
| 5927 | } |
Michael LeMay | d720024 | 2006-06-22 14:47:17 -0700 | [diff] [blame] | 5928 | #ifdef CONFIG_KEYS |
| 5929 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 5930 | static int selinux_key_alloc(struct key *k, const struct cred *cred, |
David Howells | 7e047ef | 2006-06-26 00:24:50 -0700 | [diff] [blame] | 5931 | unsigned long flags) |
Michael LeMay | d720024 | 2006-06-22 14:47:17 -0700 | [diff] [blame] | 5932 | { |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 5933 | const struct task_security_struct *tsec; |
Michael LeMay | d720024 | 2006-06-22 14:47:17 -0700 | [diff] [blame] | 5934 | struct key_security_struct *ksec; |
| 5935 | |
| 5936 | ksec = kzalloc(sizeof(struct key_security_struct), GFP_KERNEL); |
| 5937 | if (!ksec) |
| 5938 | return -ENOMEM; |
| 5939 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 5940 | tsec = cred->security; |
| 5941 | if (tsec->keycreate_sid) |
| 5942 | ksec->sid = tsec->keycreate_sid; |
Michael LeMay | 4eb582c | 2006-06-26 00:24:57 -0700 | [diff] [blame] | 5943 | else |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 5944 | ksec->sid = tsec->sid; |
Michael LeMay | d720024 | 2006-06-22 14:47:17 -0700 | [diff] [blame] | 5945 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5946 | k->security = ksec; |
Michael LeMay | d720024 | 2006-06-22 14:47:17 -0700 | [diff] [blame] | 5947 | return 0; |
| 5948 | } |
| 5949 | |
| 5950 | static void selinux_key_free(struct key *k) |
| 5951 | { |
| 5952 | struct key_security_struct *ksec = k->security; |
| 5953 | |
| 5954 | k->security = NULL; |
| 5955 | kfree(ksec); |
| 5956 | } |
| 5957 | |
| 5958 | static int selinux_key_permission(key_ref_t key_ref, |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 5959 | const struct cred *cred, |
David Howells | f589594 | 2014-03-14 17:44:49 +0000 | [diff] [blame] | 5960 | unsigned perm) |
Michael LeMay | d720024 | 2006-06-22 14:47:17 -0700 | [diff] [blame] | 5961 | { |
| 5962 | struct key *key; |
Michael LeMay | d720024 | 2006-06-22 14:47:17 -0700 | [diff] [blame] | 5963 | struct key_security_struct *ksec; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5964 | u32 sid; |
Michael LeMay | d720024 | 2006-06-22 14:47:17 -0700 | [diff] [blame] | 5965 | |
| 5966 | /* if no specific permissions are requested, we skip the |
| 5967 | permission check. No serious, additional covert channels |
| 5968 | appear to be created. */ |
| 5969 | if (perm == 0) |
| 5970 | return 0; |
| 5971 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 5972 | sid = cred_sid(cred); |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5973 | |
| 5974 | key = key_ref_to_ptr(key_ref); |
| 5975 | ksec = key->security; |
| 5976 | |
| 5977 | return avc_has_perm(sid, ksec->sid, SECCLASS_KEY, perm, NULL); |
Michael LeMay | d720024 | 2006-06-22 14:47:17 -0700 | [diff] [blame] | 5978 | } |
| 5979 | |
David Howells | 70a5bb7 | 2008-04-29 01:01:26 -0700 | [diff] [blame] | 5980 | static int selinux_key_getsecurity(struct key *key, char **_buffer) |
| 5981 | { |
| 5982 | struct key_security_struct *ksec = key->security; |
| 5983 | char *context = NULL; |
| 5984 | unsigned len; |
| 5985 | int rc; |
| 5986 | |
| 5987 | rc = security_sid_to_context(ksec->sid, &context, &len); |
| 5988 | if (!rc) |
| 5989 | rc = len; |
| 5990 | *_buffer = context; |
| 5991 | return rc; |
| 5992 | } |
| 5993 | |
Michael LeMay | d720024 | 2006-06-22 14:47:17 -0700 | [diff] [blame] | 5994 | #endif |
| 5995 | |
Casey Schaufler | b1d9e6b | 2015-05-02 15:11:42 -0700 | [diff] [blame] | 5996 | static struct security_hook_list selinux_hooks[] = { |
Casey Schaufler | e20b043 | 2015-05-02 15:11:36 -0700 | [diff] [blame] | 5997 | LSM_HOOK_INIT(binder_set_context_mgr, selinux_binder_set_context_mgr), |
| 5998 | LSM_HOOK_INIT(binder_transaction, selinux_binder_transaction), |
| 5999 | LSM_HOOK_INIT(binder_transfer_binder, selinux_binder_transfer_binder), |
| 6000 | LSM_HOOK_INIT(binder_transfer_file, selinux_binder_transfer_file), |
Ahmed S. Darwish | 076c54c | 2008-03-06 18:09:10 +0200 | [diff] [blame] | 6001 | |
Casey Schaufler | e20b043 | 2015-05-02 15:11:36 -0700 | [diff] [blame] | 6002 | LSM_HOOK_INIT(ptrace_access_check, selinux_ptrace_access_check), |
| 6003 | LSM_HOOK_INIT(ptrace_traceme, selinux_ptrace_traceme), |
| 6004 | LSM_HOOK_INIT(capget, selinux_capget), |
| 6005 | LSM_HOOK_INIT(capset, selinux_capset), |
| 6006 | LSM_HOOK_INIT(capable, selinux_capable), |
| 6007 | LSM_HOOK_INIT(quotactl, selinux_quotactl), |
| 6008 | LSM_HOOK_INIT(quota_on, selinux_quota_on), |
| 6009 | LSM_HOOK_INIT(syslog, selinux_syslog), |
| 6010 | LSM_HOOK_INIT(vm_enough_memory, selinux_vm_enough_memory), |
Stephen Smalley | 79af730 | 2015-01-21 10:54:10 -0500 | [diff] [blame] | 6011 | |
Casey Schaufler | e20b043 | 2015-05-02 15:11:36 -0700 | [diff] [blame] | 6012 | LSM_HOOK_INIT(netlink_send, selinux_netlink_send), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6013 | |
Casey Schaufler | e20b043 | 2015-05-02 15:11:36 -0700 | [diff] [blame] | 6014 | LSM_HOOK_INIT(bprm_set_creds, selinux_bprm_set_creds), |
| 6015 | LSM_HOOK_INIT(bprm_committing_creds, selinux_bprm_committing_creds), |
| 6016 | LSM_HOOK_INIT(bprm_committed_creds, selinux_bprm_committed_creds), |
| 6017 | LSM_HOOK_INIT(bprm_secureexec, selinux_bprm_secureexec), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6018 | |
Casey Schaufler | e20b043 | 2015-05-02 15:11:36 -0700 | [diff] [blame] | 6019 | LSM_HOOK_INIT(sb_alloc_security, selinux_sb_alloc_security), |
| 6020 | LSM_HOOK_INIT(sb_free_security, selinux_sb_free_security), |
| 6021 | LSM_HOOK_INIT(sb_copy_data, selinux_sb_copy_data), |
| 6022 | LSM_HOOK_INIT(sb_remount, selinux_sb_remount), |
| 6023 | LSM_HOOK_INIT(sb_kern_mount, selinux_sb_kern_mount), |
| 6024 | LSM_HOOK_INIT(sb_show_options, selinux_sb_show_options), |
| 6025 | LSM_HOOK_INIT(sb_statfs, selinux_sb_statfs), |
| 6026 | LSM_HOOK_INIT(sb_mount, selinux_mount), |
| 6027 | LSM_HOOK_INIT(sb_umount, selinux_umount), |
| 6028 | LSM_HOOK_INIT(sb_set_mnt_opts, selinux_set_mnt_opts), |
| 6029 | LSM_HOOK_INIT(sb_clone_mnt_opts, selinux_sb_clone_mnt_opts), |
| 6030 | LSM_HOOK_INIT(sb_parse_opts_str, selinux_parse_opts_str), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6031 | |
Casey Schaufler | e20b043 | 2015-05-02 15:11:36 -0700 | [diff] [blame] | 6032 | LSM_HOOK_INIT(dentry_init_security, selinux_dentry_init_security), |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 6033 | |
Casey Schaufler | e20b043 | 2015-05-02 15:11:36 -0700 | [diff] [blame] | 6034 | LSM_HOOK_INIT(inode_alloc_security, selinux_inode_alloc_security), |
| 6035 | LSM_HOOK_INIT(inode_free_security, selinux_inode_free_security), |
| 6036 | LSM_HOOK_INIT(inode_init_security, selinux_inode_init_security), |
| 6037 | LSM_HOOK_INIT(inode_create, selinux_inode_create), |
| 6038 | LSM_HOOK_INIT(inode_link, selinux_inode_link), |
| 6039 | LSM_HOOK_INIT(inode_unlink, selinux_inode_unlink), |
| 6040 | LSM_HOOK_INIT(inode_symlink, selinux_inode_symlink), |
| 6041 | LSM_HOOK_INIT(inode_mkdir, selinux_inode_mkdir), |
| 6042 | LSM_HOOK_INIT(inode_rmdir, selinux_inode_rmdir), |
| 6043 | LSM_HOOK_INIT(inode_mknod, selinux_inode_mknod), |
| 6044 | LSM_HOOK_INIT(inode_rename, selinux_inode_rename), |
| 6045 | LSM_HOOK_INIT(inode_readlink, selinux_inode_readlink), |
| 6046 | LSM_HOOK_INIT(inode_follow_link, selinux_inode_follow_link), |
| 6047 | LSM_HOOK_INIT(inode_permission, selinux_inode_permission), |
| 6048 | LSM_HOOK_INIT(inode_setattr, selinux_inode_setattr), |
| 6049 | LSM_HOOK_INIT(inode_getattr, selinux_inode_getattr), |
| 6050 | LSM_HOOK_INIT(inode_setxattr, selinux_inode_setxattr), |
| 6051 | LSM_HOOK_INIT(inode_post_setxattr, selinux_inode_post_setxattr), |
| 6052 | LSM_HOOK_INIT(inode_getxattr, selinux_inode_getxattr), |
| 6053 | LSM_HOOK_INIT(inode_listxattr, selinux_inode_listxattr), |
| 6054 | LSM_HOOK_INIT(inode_removexattr, selinux_inode_removexattr), |
| 6055 | LSM_HOOK_INIT(inode_getsecurity, selinux_inode_getsecurity), |
| 6056 | LSM_HOOK_INIT(inode_setsecurity, selinux_inode_setsecurity), |
| 6057 | LSM_HOOK_INIT(inode_listsecurity, selinux_inode_listsecurity), |
| 6058 | LSM_HOOK_INIT(inode_getsecid, selinux_inode_getsecid), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6059 | |
Casey Schaufler | e20b043 | 2015-05-02 15:11:36 -0700 | [diff] [blame] | 6060 | LSM_HOOK_INIT(file_permission, selinux_file_permission), |
| 6061 | LSM_HOOK_INIT(file_alloc_security, selinux_file_alloc_security), |
| 6062 | LSM_HOOK_INIT(file_free_security, selinux_file_free_security), |
| 6063 | LSM_HOOK_INIT(file_ioctl, selinux_file_ioctl), |
| 6064 | LSM_HOOK_INIT(mmap_file, selinux_mmap_file), |
| 6065 | LSM_HOOK_INIT(mmap_addr, selinux_mmap_addr), |
| 6066 | LSM_HOOK_INIT(file_mprotect, selinux_file_mprotect), |
| 6067 | LSM_HOOK_INIT(file_lock, selinux_file_lock), |
| 6068 | LSM_HOOK_INIT(file_fcntl, selinux_file_fcntl), |
| 6069 | LSM_HOOK_INIT(file_set_fowner, selinux_file_set_fowner), |
| 6070 | LSM_HOOK_INIT(file_send_sigiotask, selinux_file_send_sigiotask), |
| 6071 | LSM_HOOK_INIT(file_receive, selinux_file_receive), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6072 | |
Casey Schaufler | e20b043 | 2015-05-02 15:11:36 -0700 | [diff] [blame] | 6073 | LSM_HOOK_INIT(file_open, selinux_file_open), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6074 | |
Casey Schaufler | e20b043 | 2015-05-02 15:11:36 -0700 | [diff] [blame] | 6075 | LSM_HOOK_INIT(task_create, selinux_task_create), |
| 6076 | LSM_HOOK_INIT(cred_alloc_blank, selinux_cred_alloc_blank), |
| 6077 | LSM_HOOK_INIT(cred_free, selinux_cred_free), |
| 6078 | LSM_HOOK_INIT(cred_prepare, selinux_cred_prepare), |
| 6079 | LSM_HOOK_INIT(cred_transfer, selinux_cred_transfer), |
| 6080 | LSM_HOOK_INIT(kernel_act_as, selinux_kernel_act_as), |
| 6081 | LSM_HOOK_INIT(kernel_create_files_as, selinux_kernel_create_files_as), |
| 6082 | LSM_HOOK_INIT(kernel_module_request, selinux_kernel_module_request), |
Jeff Vander Stoep | 61d612e | 2016-04-05 13:06:27 -0700 | [diff] [blame] | 6083 | LSM_HOOK_INIT(kernel_read_file, selinux_kernel_read_file), |
Casey Schaufler | e20b043 | 2015-05-02 15:11:36 -0700 | [diff] [blame] | 6084 | LSM_HOOK_INIT(task_setpgid, selinux_task_setpgid), |
| 6085 | LSM_HOOK_INIT(task_getpgid, selinux_task_getpgid), |
| 6086 | LSM_HOOK_INIT(task_getsid, selinux_task_getsid), |
| 6087 | LSM_HOOK_INIT(task_getsecid, selinux_task_getsecid), |
| 6088 | LSM_HOOK_INIT(task_setnice, selinux_task_setnice), |
| 6089 | LSM_HOOK_INIT(task_setioprio, selinux_task_setioprio), |
| 6090 | LSM_HOOK_INIT(task_getioprio, selinux_task_getioprio), |
| 6091 | LSM_HOOK_INIT(task_setrlimit, selinux_task_setrlimit), |
| 6092 | LSM_HOOK_INIT(task_setscheduler, selinux_task_setscheduler), |
| 6093 | LSM_HOOK_INIT(task_getscheduler, selinux_task_getscheduler), |
| 6094 | LSM_HOOK_INIT(task_movememory, selinux_task_movememory), |
| 6095 | LSM_HOOK_INIT(task_kill, selinux_task_kill), |
| 6096 | LSM_HOOK_INIT(task_wait, selinux_task_wait), |
| 6097 | LSM_HOOK_INIT(task_to_inode, selinux_task_to_inode), |
Yuichi Nakamura | 788e7dd | 2007-09-14 09:27:07 +0900 | [diff] [blame] | 6098 | |
Casey Schaufler | e20b043 | 2015-05-02 15:11:36 -0700 | [diff] [blame] | 6099 | LSM_HOOK_INIT(ipc_permission, selinux_ipc_permission), |
| 6100 | LSM_HOOK_INIT(ipc_getsecid, selinux_ipc_getsecid), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6101 | |
Casey Schaufler | e20b043 | 2015-05-02 15:11:36 -0700 | [diff] [blame] | 6102 | LSM_HOOK_INIT(msg_msg_alloc_security, selinux_msg_msg_alloc_security), |
| 6103 | LSM_HOOK_INIT(msg_msg_free_security, selinux_msg_msg_free_security), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6104 | |
Casey Schaufler | e20b043 | 2015-05-02 15:11:36 -0700 | [diff] [blame] | 6105 | LSM_HOOK_INIT(msg_queue_alloc_security, |
| 6106 | selinux_msg_queue_alloc_security), |
| 6107 | LSM_HOOK_INIT(msg_queue_free_security, selinux_msg_queue_free_security), |
| 6108 | LSM_HOOK_INIT(msg_queue_associate, selinux_msg_queue_associate), |
| 6109 | LSM_HOOK_INIT(msg_queue_msgctl, selinux_msg_queue_msgctl), |
| 6110 | LSM_HOOK_INIT(msg_queue_msgsnd, selinux_msg_queue_msgsnd), |
| 6111 | LSM_HOOK_INIT(msg_queue_msgrcv, selinux_msg_queue_msgrcv), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6112 | |
Casey Schaufler | e20b043 | 2015-05-02 15:11:36 -0700 | [diff] [blame] | 6113 | LSM_HOOK_INIT(shm_alloc_security, selinux_shm_alloc_security), |
| 6114 | LSM_HOOK_INIT(shm_free_security, selinux_shm_free_security), |
| 6115 | LSM_HOOK_INIT(shm_associate, selinux_shm_associate), |
| 6116 | LSM_HOOK_INIT(shm_shmctl, selinux_shm_shmctl), |
| 6117 | LSM_HOOK_INIT(shm_shmat, selinux_shm_shmat), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6118 | |
Casey Schaufler | e20b043 | 2015-05-02 15:11:36 -0700 | [diff] [blame] | 6119 | LSM_HOOK_INIT(sem_alloc_security, selinux_sem_alloc_security), |
| 6120 | LSM_HOOK_INIT(sem_free_security, selinux_sem_free_security), |
| 6121 | LSM_HOOK_INIT(sem_associate, selinux_sem_associate), |
| 6122 | LSM_HOOK_INIT(sem_semctl, selinux_sem_semctl), |
| 6123 | LSM_HOOK_INIT(sem_semop, selinux_sem_semop), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6124 | |
Casey Schaufler | e20b043 | 2015-05-02 15:11:36 -0700 | [diff] [blame] | 6125 | LSM_HOOK_INIT(d_instantiate, selinux_d_instantiate), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6126 | |
Casey Schaufler | e20b043 | 2015-05-02 15:11:36 -0700 | [diff] [blame] | 6127 | LSM_HOOK_INIT(getprocattr, selinux_getprocattr), |
| 6128 | LSM_HOOK_INIT(setprocattr, selinux_setprocattr), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6129 | |
Casey Schaufler | e20b043 | 2015-05-02 15:11:36 -0700 | [diff] [blame] | 6130 | LSM_HOOK_INIT(ismaclabel, selinux_ismaclabel), |
| 6131 | LSM_HOOK_INIT(secid_to_secctx, selinux_secid_to_secctx), |
| 6132 | LSM_HOOK_INIT(secctx_to_secid, selinux_secctx_to_secid), |
| 6133 | LSM_HOOK_INIT(release_secctx, selinux_release_secctx), |
Andreas Gruenbacher | 6f3be9f | 2015-12-24 11:09:40 -0500 | [diff] [blame] | 6134 | LSM_HOOK_INIT(inode_invalidate_secctx, selinux_inode_invalidate_secctx), |
Casey Schaufler | e20b043 | 2015-05-02 15:11:36 -0700 | [diff] [blame] | 6135 | LSM_HOOK_INIT(inode_notifysecctx, selinux_inode_notifysecctx), |
| 6136 | LSM_HOOK_INIT(inode_setsecctx, selinux_inode_setsecctx), |
| 6137 | LSM_HOOK_INIT(inode_getsecctx, selinux_inode_getsecctx), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6138 | |
Casey Schaufler | e20b043 | 2015-05-02 15:11:36 -0700 | [diff] [blame] | 6139 | LSM_HOOK_INIT(unix_stream_connect, selinux_socket_unix_stream_connect), |
| 6140 | LSM_HOOK_INIT(unix_may_send, selinux_socket_unix_may_send), |
Catherine Zhang | dc49c1f | 2006-08-02 14:12:06 -0700 | [diff] [blame] | 6141 | |
Casey Schaufler | e20b043 | 2015-05-02 15:11:36 -0700 | [diff] [blame] | 6142 | LSM_HOOK_INIT(socket_create, selinux_socket_create), |
| 6143 | LSM_HOOK_INIT(socket_post_create, selinux_socket_post_create), |
| 6144 | LSM_HOOK_INIT(socket_bind, selinux_socket_bind), |
| 6145 | LSM_HOOK_INIT(socket_connect, selinux_socket_connect), |
| 6146 | LSM_HOOK_INIT(socket_listen, selinux_socket_listen), |
| 6147 | LSM_HOOK_INIT(socket_accept, selinux_socket_accept), |
| 6148 | LSM_HOOK_INIT(socket_sendmsg, selinux_socket_sendmsg), |
| 6149 | LSM_HOOK_INIT(socket_recvmsg, selinux_socket_recvmsg), |
| 6150 | LSM_HOOK_INIT(socket_getsockname, selinux_socket_getsockname), |
| 6151 | LSM_HOOK_INIT(socket_getpeername, selinux_socket_getpeername), |
| 6152 | LSM_HOOK_INIT(socket_getsockopt, selinux_socket_getsockopt), |
| 6153 | LSM_HOOK_INIT(socket_setsockopt, selinux_socket_setsockopt), |
| 6154 | LSM_HOOK_INIT(socket_shutdown, selinux_socket_shutdown), |
| 6155 | LSM_HOOK_INIT(socket_sock_rcv_skb, selinux_socket_sock_rcv_skb), |
| 6156 | LSM_HOOK_INIT(socket_getpeersec_stream, |
| 6157 | selinux_socket_getpeersec_stream), |
| 6158 | LSM_HOOK_INIT(socket_getpeersec_dgram, selinux_socket_getpeersec_dgram), |
| 6159 | LSM_HOOK_INIT(sk_alloc_security, selinux_sk_alloc_security), |
| 6160 | LSM_HOOK_INIT(sk_free_security, selinux_sk_free_security), |
| 6161 | LSM_HOOK_INIT(sk_clone_security, selinux_sk_clone_security), |
| 6162 | LSM_HOOK_INIT(sk_getsecid, selinux_sk_getsecid), |
| 6163 | LSM_HOOK_INIT(sock_graft, selinux_sock_graft), |
| 6164 | LSM_HOOK_INIT(inet_conn_request, selinux_inet_conn_request), |
| 6165 | LSM_HOOK_INIT(inet_csk_clone, selinux_inet_csk_clone), |
| 6166 | LSM_HOOK_INIT(inet_conn_established, selinux_inet_conn_established), |
| 6167 | LSM_HOOK_INIT(secmark_relabel_packet, selinux_secmark_relabel_packet), |
| 6168 | LSM_HOOK_INIT(secmark_refcount_inc, selinux_secmark_refcount_inc), |
| 6169 | LSM_HOOK_INIT(secmark_refcount_dec, selinux_secmark_refcount_dec), |
| 6170 | LSM_HOOK_INIT(req_classify_flow, selinux_req_classify_flow), |
| 6171 | LSM_HOOK_INIT(tun_dev_alloc_security, selinux_tun_dev_alloc_security), |
| 6172 | LSM_HOOK_INIT(tun_dev_free_security, selinux_tun_dev_free_security), |
| 6173 | LSM_HOOK_INIT(tun_dev_create, selinux_tun_dev_create), |
| 6174 | LSM_HOOK_INIT(tun_dev_attach_queue, selinux_tun_dev_attach_queue), |
| 6175 | LSM_HOOK_INIT(tun_dev_attach, selinux_tun_dev_attach), |
| 6176 | LSM_HOOK_INIT(tun_dev_open, selinux_tun_dev_open), |
Trent Jaeger | d28d1e0 | 2005-12-13 23:12:40 -0800 | [diff] [blame] | 6177 | |
| 6178 | #ifdef CONFIG_SECURITY_NETWORK_XFRM |
Casey Schaufler | e20b043 | 2015-05-02 15:11:36 -0700 | [diff] [blame] | 6179 | LSM_HOOK_INIT(xfrm_policy_alloc_security, selinux_xfrm_policy_alloc), |
| 6180 | LSM_HOOK_INIT(xfrm_policy_clone_security, selinux_xfrm_policy_clone), |
| 6181 | LSM_HOOK_INIT(xfrm_policy_free_security, selinux_xfrm_policy_free), |
| 6182 | LSM_HOOK_INIT(xfrm_policy_delete_security, selinux_xfrm_policy_delete), |
| 6183 | LSM_HOOK_INIT(xfrm_state_alloc, selinux_xfrm_state_alloc), |
| 6184 | LSM_HOOK_INIT(xfrm_state_alloc_acquire, |
| 6185 | selinux_xfrm_state_alloc_acquire), |
| 6186 | LSM_HOOK_INIT(xfrm_state_free_security, selinux_xfrm_state_free), |
| 6187 | LSM_HOOK_INIT(xfrm_state_delete_security, selinux_xfrm_state_delete), |
| 6188 | LSM_HOOK_INIT(xfrm_policy_lookup, selinux_xfrm_policy_lookup), |
| 6189 | LSM_HOOK_INIT(xfrm_state_pol_flow_match, |
| 6190 | selinux_xfrm_state_pol_flow_match), |
| 6191 | LSM_HOOK_INIT(xfrm_decode_session, selinux_xfrm_decode_session), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6192 | #endif |
Michael LeMay | d720024 | 2006-06-22 14:47:17 -0700 | [diff] [blame] | 6193 | |
| 6194 | #ifdef CONFIG_KEYS |
Casey Schaufler | e20b043 | 2015-05-02 15:11:36 -0700 | [diff] [blame] | 6195 | LSM_HOOK_INIT(key_alloc, selinux_key_alloc), |
| 6196 | LSM_HOOK_INIT(key_free, selinux_key_free), |
| 6197 | LSM_HOOK_INIT(key_permission, selinux_key_permission), |
| 6198 | LSM_HOOK_INIT(key_getsecurity, selinux_key_getsecurity), |
Michael LeMay | d720024 | 2006-06-22 14:47:17 -0700 | [diff] [blame] | 6199 | #endif |
Ahmed S. Darwish | 9d57a7f | 2008-03-01 22:03:14 +0200 | [diff] [blame] | 6200 | |
| 6201 | #ifdef CONFIG_AUDIT |
Casey Schaufler | e20b043 | 2015-05-02 15:11:36 -0700 | [diff] [blame] | 6202 | LSM_HOOK_INIT(audit_rule_init, selinux_audit_rule_init), |
| 6203 | LSM_HOOK_INIT(audit_rule_known, selinux_audit_rule_known), |
| 6204 | LSM_HOOK_INIT(audit_rule_match, selinux_audit_rule_match), |
| 6205 | LSM_HOOK_INIT(audit_rule_free, selinux_audit_rule_free), |
Ahmed S. Darwish | 9d57a7f | 2008-03-01 22:03:14 +0200 | [diff] [blame] | 6206 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6207 | }; |
| 6208 | |
| 6209 | static __init int selinux_init(void) |
| 6210 | { |
Casey Schaufler | b1d9e6b | 2015-05-02 15:11:42 -0700 | [diff] [blame] | 6211 | if (!security_module_enable("selinux")) { |
Ahmed S. Darwish | 076c54c | 2008-03-06 18:09:10 +0200 | [diff] [blame] | 6212 | selinux_enabled = 0; |
| 6213 | return 0; |
| 6214 | } |
| 6215 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6216 | if (!selinux_enabled) { |
| 6217 | printk(KERN_INFO "SELinux: Disabled at boot.\n"); |
| 6218 | return 0; |
| 6219 | } |
| 6220 | |
| 6221 | printk(KERN_INFO "SELinux: Initializing.\n"); |
| 6222 | |
| 6223 | /* Set the security state for the initial task. */ |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 6224 | cred_init_security(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6225 | |
Stephen Smalley | fcaaade | 2010-04-28 15:57:57 -0400 | [diff] [blame] | 6226 | default_noexec = !(VM_DATA_DEFAULT_FLAGS & VM_EXEC); |
| 6227 | |
James Morris | 7cae7e2 | 2006-03-22 00:09:22 -0800 | [diff] [blame] | 6228 | sel_inode_cache = kmem_cache_create("selinux_inode_security", |
| 6229 | sizeof(struct inode_security_struct), |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 6230 | 0, SLAB_PANIC, NULL); |
Sangwoo | 6320565 | 2015-10-21 17:44:30 -0400 | [diff] [blame] | 6231 | file_security_cache = kmem_cache_create("selinux_file_security", |
| 6232 | sizeof(struct file_security_struct), |
| 6233 | 0, SLAB_PANIC, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6234 | avc_init(); |
| 6235 | |
Casey Schaufler | b1d9e6b | 2015-05-02 15:11:42 -0700 | [diff] [blame] | 6236 | security_add_hooks(selinux_hooks, ARRAY_SIZE(selinux_hooks)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6237 | |
Paul Moore | 615e51f | 2014-06-26 14:33:56 -0400 | [diff] [blame] | 6238 | if (avc_add_callback(selinux_netcache_avc_callback, AVC_CALLBACK_RESET)) |
| 6239 | panic("SELinux: Unable to register AVC netcache callback\n"); |
| 6240 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 6241 | if (selinux_enforcing) |
Eric Paris | fadcdb4 | 2007-02-22 18:11:31 -0500 | [diff] [blame] | 6242 | printk(KERN_DEBUG "SELinux: Starting in enforcing mode\n"); |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 6243 | else |
Eric Paris | fadcdb4 | 2007-02-22 18:11:31 -0500 | [diff] [blame] | 6244 | printk(KERN_DEBUG "SELinux: Starting in permissive mode\n"); |
Michael LeMay | d720024 | 2006-06-22 14:47:17 -0700 | [diff] [blame] | 6245 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6246 | return 0; |
| 6247 | } |
| 6248 | |
Al Viro | e8c2625 | 2010-03-23 06:36:54 -0400 | [diff] [blame] | 6249 | static void delayed_superblock_init(struct super_block *sb, void *unused) |
| 6250 | { |
| 6251 | superblock_doinit(sb, NULL); |
| 6252 | } |
| 6253 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6254 | void selinux_complete_init(void) |
| 6255 | { |
Eric Paris | fadcdb4 | 2007-02-22 18:11:31 -0500 | [diff] [blame] | 6256 | printk(KERN_DEBUG "SELinux: Completing initialization.\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6257 | |
| 6258 | /* Set up any superblocks initialized prior to the policy load. */ |
Eric Paris | fadcdb4 | 2007-02-22 18:11:31 -0500 | [diff] [blame] | 6259 | printk(KERN_DEBUG "SELinux: Setting up existing superblocks.\n"); |
Al Viro | e8c2625 | 2010-03-23 06:36:54 -0400 | [diff] [blame] | 6260 | iterate_supers(delayed_superblock_init, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6261 | } |
| 6262 | |
| 6263 | /* SELinux requires early initialization in order to label |
| 6264 | all processes and objects when they are created. */ |
| 6265 | security_initcall(selinux_init); |
| 6266 | |
Stephen Smalley | c2b507f | 2006-02-04 23:27:50 -0800 | [diff] [blame] | 6267 | #if defined(CONFIG_NETFILTER) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6268 | |
Jiri Pirko | 25db6be | 2014-09-03 17:42:13 +0200 | [diff] [blame] | 6269 | static struct nf_hook_ops selinux_nf_ops[] = { |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 6270 | { |
| 6271 | .hook = selinux_ipv4_postroute, |
Alban Crequy | 2597a83 | 2012-05-14 03:56:39 +0000 | [diff] [blame] | 6272 | .pf = NFPROTO_IPV4, |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 6273 | .hooknum = NF_INET_POST_ROUTING, |
| 6274 | .priority = NF_IP_PRI_SELINUX_LAST, |
| 6275 | }, |
| 6276 | { |
| 6277 | .hook = selinux_ipv4_forward, |
Alban Crequy | 2597a83 | 2012-05-14 03:56:39 +0000 | [diff] [blame] | 6278 | .pf = NFPROTO_IPV4, |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 6279 | .hooknum = NF_INET_FORWARD, |
| 6280 | .priority = NF_IP_PRI_SELINUX_FIRST, |
Paul Moore | 948bf85 | 2008-10-10 10:16:32 -0400 | [diff] [blame] | 6281 | }, |
| 6282 | { |
| 6283 | .hook = selinux_ipv4_output, |
Alban Crequy | 2597a83 | 2012-05-14 03:56:39 +0000 | [diff] [blame] | 6284 | .pf = NFPROTO_IPV4, |
Paul Moore | 948bf85 | 2008-10-10 10:16:32 -0400 | [diff] [blame] | 6285 | .hooknum = NF_INET_LOCAL_OUT, |
| 6286 | .priority = NF_IP_PRI_SELINUX_FIRST, |
Jiri Pirko | 25db6be | 2014-09-03 17:42:13 +0200 | [diff] [blame] | 6287 | }, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6288 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 6289 | { |
| 6290 | .hook = selinux_ipv6_postroute, |
Alban Crequy | 2597a83 | 2012-05-14 03:56:39 +0000 | [diff] [blame] | 6291 | .pf = NFPROTO_IPV6, |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 6292 | .hooknum = NF_INET_POST_ROUTING, |
| 6293 | .priority = NF_IP6_PRI_SELINUX_LAST, |
| 6294 | }, |
| 6295 | { |
| 6296 | .hook = selinux_ipv6_forward, |
Alban Crequy | 2597a83 | 2012-05-14 03:56:39 +0000 | [diff] [blame] | 6297 | .pf = NFPROTO_IPV6, |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 6298 | .hooknum = NF_INET_FORWARD, |
| 6299 | .priority = NF_IP6_PRI_SELINUX_FIRST, |
Jiri Pirko | 25db6be | 2014-09-03 17:42:13 +0200 | [diff] [blame] | 6300 | }, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6301 | #endif /* IPV6 */ |
Jiri Pirko | 25db6be | 2014-09-03 17:42:13 +0200 | [diff] [blame] | 6302 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6303 | |
| 6304 | static int __init selinux_nf_ip_init(void) |
| 6305 | { |
Jiri Pirko | 25db6be | 2014-09-03 17:42:13 +0200 | [diff] [blame] | 6306 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6307 | |
| 6308 | if (!selinux_enabled) |
Jiri Pirko | 25db6be | 2014-09-03 17:42:13 +0200 | [diff] [blame] | 6309 | return 0; |
Eric Paris | fadcdb4 | 2007-02-22 18:11:31 -0500 | [diff] [blame] | 6310 | |
| 6311 | printk(KERN_DEBUG "SELinux: Registering netfilter hooks\n"); |
| 6312 | |
Jiri Pirko | 25db6be | 2014-09-03 17:42:13 +0200 | [diff] [blame] | 6313 | err = nf_register_hooks(selinux_nf_ops, ARRAY_SIZE(selinux_nf_ops)); |
Alexey Dobriyan | 6c5a9d2 | 2008-07-26 17:48:15 -0700 | [diff] [blame] | 6314 | if (err) |
Jiri Pirko | 25db6be | 2014-09-03 17:42:13 +0200 | [diff] [blame] | 6315 | panic("SELinux: nf_register_hooks: error %d\n", err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6316 | |
Jiri Pirko | 25db6be | 2014-09-03 17:42:13 +0200 | [diff] [blame] | 6317 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6318 | } |
| 6319 | |
| 6320 | __initcall(selinux_nf_ip_init); |
| 6321 | |
| 6322 | #ifdef CONFIG_SECURITY_SELINUX_DISABLE |
| 6323 | static void selinux_nf_ip_exit(void) |
| 6324 | { |
Eric Paris | fadcdb4 | 2007-02-22 18:11:31 -0500 | [diff] [blame] | 6325 | printk(KERN_DEBUG "SELinux: Unregistering netfilter hooks\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6326 | |
Jiri Pirko | 25db6be | 2014-09-03 17:42:13 +0200 | [diff] [blame] | 6327 | nf_unregister_hooks(selinux_nf_ops, ARRAY_SIZE(selinux_nf_ops)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6328 | } |
| 6329 | #endif |
| 6330 | |
Stephen Smalley | c2b507f | 2006-02-04 23:27:50 -0800 | [diff] [blame] | 6331 | #else /* CONFIG_NETFILTER */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6332 | |
| 6333 | #ifdef CONFIG_SECURITY_SELINUX_DISABLE |
| 6334 | #define selinux_nf_ip_exit() |
| 6335 | #endif |
| 6336 | |
Stephen Smalley | c2b507f | 2006-02-04 23:27:50 -0800 | [diff] [blame] | 6337 | #endif /* CONFIG_NETFILTER */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6338 | |
| 6339 | #ifdef CONFIG_SECURITY_SELINUX_DISABLE |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 6340 | static int selinux_disabled; |
| 6341 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6342 | int selinux_disable(void) |
| 6343 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6344 | if (ss_initialized) { |
| 6345 | /* Not permitted after initial policy load. */ |
| 6346 | return -EINVAL; |
| 6347 | } |
| 6348 | |
| 6349 | if (selinux_disabled) { |
| 6350 | /* Only do this once. */ |
| 6351 | return -EINVAL; |
| 6352 | } |
| 6353 | |
| 6354 | printk(KERN_INFO "SELinux: Disabled at runtime.\n"); |
| 6355 | |
| 6356 | selinux_disabled = 1; |
Stephen Smalley | 30d5528 | 2006-05-03 10:52:36 -0400 | [diff] [blame] | 6357 | selinux_enabled = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6358 | |
Casey Schaufler | b1d9e6b | 2015-05-02 15:11:42 -0700 | [diff] [blame] | 6359 | security_delete_hooks(selinux_hooks, ARRAY_SIZE(selinux_hooks)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6360 | |
Eric Paris | af8ff04 | 2009-09-20 21:23:01 -0400 | [diff] [blame] | 6361 | /* Try to destroy the avc node cache */ |
| 6362 | avc_disable(); |
| 6363 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6364 | /* Unregister netfilter hooks. */ |
| 6365 | selinux_nf_ip_exit(); |
| 6366 | |
| 6367 | /* Unregister selinuxfs. */ |
| 6368 | exit_sel_fs(); |
| 6369 | |
| 6370 | return 0; |
| 6371 | } |
| 6372 | #endif |