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> |
| 32 | #include <linux/security.h> |
| 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[] */ |
Eric Dumazet | ca10b9e | 2013-04-08 17:58:11 +0000 | [diff] [blame] | 54 | #include <net/sock.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 55 | #include <net/tcp.h> /* struct or_callable used in sock_rcv_skb */ |
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 | |
David P. Quigley | 11689d4 | 2009-01-16 09:22:03 -0500 | [diff] [blame] | 97 | #define NUM_SEL_MNT_OPTS 5 |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 98 | |
James Morris | 20510f2 | 2007-10-16 23:31:32 -0700 | [diff] [blame] | 99 | extern struct security_operations *security_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 100 | |
Paul Moore | d621d35 | 2008-01-29 08:43:36 -0500 | [diff] [blame] | 101 | /* SECMARK reference count */ |
James Morris | 56a4ca9 | 2011-08-17 11:08:43 +1000 | [diff] [blame] | 102 | static atomic_t selinux_secmark_refcount = ATOMIC_INIT(0); |
Paul Moore | d621d35 | 2008-01-29 08:43:36 -0500 | [diff] [blame] | 103 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | #ifdef CONFIG_SECURITY_SELINUX_DEVELOP |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 105 | int selinux_enforcing; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | |
| 107 | static int __init enforcing_setup(char *str) |
| 108 | { |
Eric Paris | f526971 | 2008-05-14 11:27:45 -0400 | [diff] [blame] | 109 | unsigned long enforcing; |
| 110 | if (!strict_strtoul(str, 0, &enforcing)) |
| 111 | selinux_enforcing = enforcing ? 1 : 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | return 1; |
| 113 | } |
| 114 | __setup("enforcing=", enforcing_setup); |
| 115 | #endif |
| 116 | |
| 117 | #ifdef CONFIG_SECURITY_SELINUX_BOOTPARAM |
| 118 | int selinux_enabled = CONFIG_SECURITY_SELINUX_BOOTPARAM_VALUE; |
| 119 | |
| 120 | static int __init selinux_enabled_setup(char *str) |
| 121 | { |
Eric Paris | f526971 | 2008-05-14 11:27:45 -0400 | [diff] [blame] | 122 | unsigned long enabled; |
| 123 | if (!strict_strtoul(str, 0, &enabled)) |
| 124 | selinux_enabled = enabled ? 1 : 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 125 | return 1; |
| 126 | } |
| 127 | __setup("selinux=", selinux_enabled_setup); |
Stephen Smalley | 30d5528 | 2006-05-03 10:52:36 -0400 | [diff] [blame] | 128 | #else |
| 129 | int selinux_enabled = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 130 | #endif |
| 131 | |
Christoph Lameter | e18b890 | 2006-12-06 20:33:20 -0800 | [diff] [blame] | 132 | static struct kmem_cache *sel_inode_cache; |
James Morris | 7cae7e2 | 2006-03-22 00:09:22 -0800 | [diff] [blame] | 133 | |
Paul Moore | d621d35 | 2008-01-29 08:43:36 -0500 | [diff] [blame] | 134 | /** |
| 135 | * selinux_secmark_enabled - Check to see if SECMARK is currently enabled |
| 136 | * |
| 137 | * Description: |
| 138 | * This function checks the SECMARK reference counter to see if any SECMARK |
| 139 | * targets are currently configured, if the reference counter is greater than |
| 140 | * zero SECMARK is considered to be enabled. Returns true (1) if SECMARK is |
| 141 | * enabled, false (0) if SECMARK is disabled. |
| 142 | * |
| 143 | */ |
| 144 | static int selinux_secmark_enabled(void) |
| 145 | { |
| 146 | return (atomic_read(&selinux_secmark_refcount) > 0); |
| 147 | } |
| 148 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 149 | /* |
| 150 | * initialise the security for the init task |
| 151 | */ |
| 152 | static void cred_init_security(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 153 | { |
David Howells | 3b11a1d | 2008-11-14 10:39:26 +1100 | [diff] [blame] | 154 | struct cred *cred = (struct cred *) current->real_cred; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 155 | struct task_security_struct *tsec; |
| 156 | |
James Morris | 89d155e | 2005-10-30 14:59:21 -0800 | [diff] [blame] | 157 | tsec = kzalloc(sizeof(struct task_security_struct), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 158 | if (!tsec) |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 159 | panic("SELinux: Failed to initialize initial task.\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 160 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 161 | tsec->osid = tsec->sid = SECINITSID_KERNEL; |
David Howells | f1752ee | 2008-11-14 10:39:17 +1100 | [diff] [blame] | 162 | cred->security = tsec; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 163 | } |
| 164 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 165 | /* |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 166 | * get the security ID of a set of credentials |
| 167 | */ |
| 168 | static inline u32 cred_sid(const struct cred *cred) |
| 169 | { |
| 170 | const struct task_security_struct *tsec; |
| 171 | |
| 172 | tsec = cred->security; |
| 173 | return tsec->sid; |
| 174 | } |
| 175 | |
| 176 | /* |
David Howells | 3b11a1d | 2008-11-14 10:39:26 +1100 | [diff] [blame] | 177 | * get the objective security ID of a task |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 178 | */ |
| 179 | static inline u32 task_sid(const struct task_struct *task) |
| 180 | { |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 181 | u32 sid; |
| 182 | |
| 183 | rcu_read_lock(); |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 184 | sid = cred_sid(__task_cred(task)); |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 185 | rcu_read_unlock(); |
| 186 | return sid; |
| 187 | } |
| 188 | |
| 189 | /* |
David Howells | 3b11a1d | 2008-11-14 10:39:26 +1100 | [diff] [blame] | 190 | * get the subjective security ID of the current task |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 191 | */ |
| 192 | static inline u32 current_sid(void) |
| 193 | { |
Paul Moore | 5fb4987 | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 194 | const struct task_security_struct *tsec = current_security(); |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 195 | |
| 196 | return tsec->sid; |
| 197 | } |
| 198 | |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 199 | /* Allocate and free functions for each kind of security blob. */ |
| 200 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 201 | static int inode_alloc_security(struct inode *inode) |
| 202 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 203 | struct inode_security_struct *isec; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 204 | u32 sid = current_sid(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 205 | |
Josef Bacik | a02fe13 | 2008-04-04 09:35:05 +1100 | [diff] [blame] | 206 | isec = kmem_cache_zalloc(sel_inode_cache, GFP_NOFS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 207 | if (!isec) |
| 208 | return -ENOMEM; |
| 209 | |
Eric Paris | 2397074 | 2006-09-25 23:32:01 -0700 | [diff] [blame] | 210 | mutex_init(&isec->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 211 | INIT_LIST_HEAD(&isec->list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 212 | isec->inode = inode; |
| 213 | isec->sid = SECINITSID_UNLABELED; |
| 214 | isec->sclass = SECCLASS_FILE; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 215 | isec->task_sid = sid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 216 | inode->i_security = isec; |
| 217 | |
| 218 | return 0; |
| 219 | } |
| 220 | |
| 221 | static void inode_free_security(struct inode *inode) |
| 222 | { |
| 223 | struct inode_security_struct *isec = inode->i_security; |
| 224 | struct superblock_security_struct *sbsec = inode->i_sb->s_security; |
| 225 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 226 | spin_lock(&sbsec->isec_lock); |
| 227 | if (!list_empty(&isec->list)) |
| 228 | list_del_init(&isec->list); |
| 229 | spin_unlock(&sbsec->isec_lock); |
| 230 | |
| 231 | inode->i_security = NULL; |
James Morris | 7cae7e2 | 2006-03-22 00:09:22 -0800 | [diff] [blame] | 232 | kmem_cache_free(sel_inode_cache, isec); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 233 | } |
| 234 | |
| 235 | static int file_alloc_security(struct file *file) |
| 236 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 237 | struct file_security_struct *fsec; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 238 | u32 sid = current_sid(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 239 | |
Stephen Smalley | 26d2a4b | 2006-02-01 03:05:55 -0800 | [diff] [blame] | 240 | fsec = kzalloc(sizeof(struct file_security_struct), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 241 | if (!fsec) |
| 242 | return -ENOMEM; |
| 243 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 244 | fsec->sid = sid; |
| 245 | fsec->fown_sid = sid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 246 | file->f_security = fsec; |
| 247 | |
| 248 | return 0; |
| 249 | } |
| 250 | |
| 251 | static void file_free_security(struct file *file) |
| 252 | { |
| 253 | struct file_security_struct *fsec = file->f_security; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 254 | file->f_security = NULL; |
| 255 | kfree(fsec); |
| 256 | } |
| 257 | |
| 258 | static int superblock_alloc_security(struct super_block *sb) |
| 259 | { |
| 260 | struct superblock_security_struct *sbsec; |
| 261 | |
James Morris | 89d155e | 2005-10-30 14:59:21 -0800 | [diff] [blame] | 262 | sbsec = kzalloc(sizeof(struct superblock_security_struct), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 263 | if (!sbsec) |
| 264 | return -ENOMEM; |
| 265 | |
Eric Paris | bc7e982 | 2006-09-25 23:32:02 -0700 | [diff] [blame] | 266 | mutex_init(&sbsec->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 267 | INIT_LIST_HEAD(&sbsec->isec_head); |
| 268 | spin_lock_init(&sbsec->isec_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 269 | sbsec->sb = sb; |
| 270 | sbsec->sid = SECINITSID_UNLABELED; |
| 271 | sbsec->def_sid = SECINITSID_FILE; |
Eric Paris | c312feb | 2006-07-10 04:43:53 -0700 | [diff] [blame] | 272 | sbsec->mntpoint_sid = SECINITSID_UNLABELED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 273 | sb->s_security = sbsec; |
| 274 | |
| 275 | return 0; |
| 276 | } |
| 277 | |
| 278 | static void superblock_free_security(struct super_block *sb) |
| 279 | { |
| 280 | struct superblock_security_struct *sbsec = sb->s_security; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 281 | sb->s_security = NULL; |
| 282 | kfree(sbsec); |
| 283 | } |
| 284 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 285 | /* The file system's label must be initialized prior to use. */ |
| 286 | |
Stephen Hemminger | 634a539 | 2010-03-04 21:59:03 -0800 | [diff] [blame] | 287 | static const char *labeling_behaviors[6] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 288 | "uses xattr", |
| 289 | "uses transition SIDs", |
| 290 | "uses task SIDs", |
| 291 | "uses genfs_contexts", |
| 292 | "not configured for labeling", |
| 293 | "uses mountpoint labeling", |
| 294 | }; |
| 295 | |
| 296 | static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dentry); |
| 297 | |
| 298 | static inline int inode_doinit(struct inode *inode) |
| 299 | { |
| 300 | return inode_doinit_with_dentry(inode, NULL); |
| 301 | } |
| 302 | |
| 303 | enum { |
Eric Paris | 31e8793 | 2007-09-19 17:19:12 -0400 | [diff] [blame] | 304 | Opt_error = -1, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 305 | Opt_context = 1, |
| 306 | Opt_fscontext = 2, |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 307 | Opt_defcontext = 3, |
| 308 | Opt_rootcontext = 4, |
David P. Quigley | 11689d4 | 2009-01-16 09:22:03 -0500 | [diff] [blame] | 309 | Opt_labelsupport = 5, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 310 | }; |
| 311 | |
Steven Whitehouse | a447c09 | 2008-10-13 10:46:57 +0100 | [diff] [blame] | 312 | static const match_table_t tokens = { |
Eric Paris | 832cbd9 | 2008-04-01 13:24:09 -0400 | [diff] [blame] | 313 | {Opt_context, CONTEXT_STR "%s"}, |
| 314 | {Opt_fscontext, FSCONTEXT_STR "%s"}, |
| 315 | {Opt_defcontext, DEFCONTEXT_STR "%s"}, |
| 316 | {Opt_rootcontext, ROOTCONTEXT_STR "%s"}, |
David P. Quigley | 11689d4 | 2009-01-16 09:22:03 -0500 | [diff] [blame] | 317 | {Opt_labelsupport, LABELSUPP_STR}, |
Eric Paris | 31e8793 | 2007-09-19 17:19:12 -0400 | [diff] [blame] | 318 | {Opt_error, NULL}, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 319 | }; |
| 320 | |
| 321 | #define SEL_MOUNT_FAIL_MSG "SELinux: duplicate or incompatible mount options\n" |
| 322 | |
Eric Paris | c312feb | 2006-07-10 04:43:53 -0700 | [diff] [blame] | 323 | static int may_context_mount_sb_relabel(u32 sid, |
| 324 | struct superblock_security_struct *sbsec, |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 325 | const struct cred *cred) |
Eric Paris | c312feb | 2006-07-10 04:43:53 -0700 | [diff] [blame] | 326 | { |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 327 | const struct task_security_struct *tsec = cred->security; |
Eric Paris | c312feb | 2006-07-10 04:43:53 -0700 | [diff] [blame] | 328 | int rc; |
| 329 | |
| 330 | rc = avc_has_perm(tsec->sid, sbsec->sid, SECCLASS_FILESYSTEM, |
| 331 | FILESYSTEM__RELABELFROM, NULL); |
| 332 | if (rc) |
| 333 | return rc; |
| 334 | |
| 335 | rc = avc_has_perm(tsec->sid, sid, SECCLASS_FILESYSTEM, |
| 336 | FILESYSTEM__RELABELTO, NULL); |
| 337 | return rc; |
| 338 | } |
| 339 | |
Eric Paris | 0808925 | 2006-07-10 04:43:55 -0700 | [diff] [blame] | 340 | static int may_context_mount_inode_relabel(u32 sid, |
| 341 | struct superblock_security_struct *sbsec, |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 342 | const struct cred *cred) |
Eric Paris | 0808925 | 2006-07-10 04:43:55 -0700 | [diff] [blame] | 343 | { |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 344 | const struct task_security_struct *tsec = cred->security; |
Eric Paris | 0808925 | 2006-07-10 04:43:55 -0700 | [diff] [blame] | 345 | int rc; |
| 346 | rc = avc_has_perm(tsec->sid, sbsec->sid, SECCLASS_FILESYSTEM, |
| 347 | FILESYSTEM__RELABELFROM, NULL); |
| 348 | if (rc) |
| 349 | return rc; |
| 350 | |
| 351 | rc = avc_has_perm(sid, sbsec->sid, SECCLASS_FILESYSTEM, |
| 352 | FILESYSTEM__ASSOCIATE, NULL); |
| 353 | return rc; |
| 354 | } |
| 355 | |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 356 | static int sb_finish_set_opts(struct super_block *sb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 357 | { |
| 358 | struct superblock_security_struct *sbsec = sb->s_security; |
| 359 | struct dentry *root = sb->s_root; |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 360 | struct inode *root_inode = root->d_inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 361 | int rc = 0; |
| 362 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 363 | if (sbsec->behavior == SECURITY_FS_USE_XATTR) { |
| 364 | /* Make sure that the xattr handler exists and that no |
| 365 | error other than -ENODATA is returned by getxattr on |
| 366 | the root directory. -ENODATA is ok, as this may be |
| 367 | the first boot of the SELinux kernel before we have |
| 368 | assigned xattr values to the filesystem. */ |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 369 | if (!root_inode->i_op->getxattr) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 370 | printk(KERN_WARNING "SELinux: (dev %s, type %s) has no " |
| 371 | "xattr support\n", sb->s_id, sb->s_type->name); |
| 372 | rc = -EOPNOTSUPP; |
| 373 | goto out; |
| 374 | } |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 375 | rc = root_inode->i_op->getxattr(root, XATTR_NAME_SELINUX, NULL, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 376 | if (rc < 0 && rc != -ENODATA) { |
| 377 | if (rc == -EOPNOTSUPP) |
| 378 | printk(KERN_WARNING "SELinux: (dev %s, type " |
| 379 | "%s) has no security xattr handler\n", |
| 380 | sb->s_id, sb->s_type->name); |
| 381 | else |
| 382 | printk(KERN_WARNING "SELinux: (dev %s, type " |
| 383 | "%s) getxattr errno %d\n", sb->s_id, |
| 384 | sb->s_type->name, -rc); |
| 385 | goto out; |
| 386 | } |
| 387 | } |
| 388 | |
David P. Quigley | 11689d4 | 2009-01-16 09:22:03 -0500 | [diff] [blame] | 389 | sbsec->flags |= (SE_SBINITIALIZED | SE_SBLABELSUPP); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 390 | |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 391 | if (sbsec->behavior > ARRAY_SIZE(labeling_behaviors)) |
Eric Paris | fadcdb4 | 2007-02-22 18:11:31 -0500 | [diff] [blame] | 392 | printk(KERN_ERR "SELinux: initialized (dev %s, type %s), unknown behavior\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 393 | sb->s_id, sb->s_type->name); |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 394 | else |
Eric Paris | fadcdb4 | 2007-02-22 18:11:31 -0500 | [diff] [blame] | 395 | printk(KERN_DEBUG "SELinux: initialized (dev %s, type %s), %s\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 396 | sb->s_id, sb->s_type->name, |
| 397 | labeling_behaviors[sbsec->behavior-1]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 398 | |
David P. Quigley | 11689d4 | 2009-01-16 09:22:03 -0500 | [diff] [blame] | 399 | if (sbsec->behavior == SECURITY_FS_USE_GENFS || |
| 400 | sbsec->behavior == SECURITY_FS_USE_MNTPOINT || |
| 401 | sbsec->behavior == SECURITY_FS_USE_NONE || |
| 402 | sbsec->behavior > ARRAY_SIZE(labeling_behaviors)) |
| 403 | sbsec->flags &= ~SE_SBLABELSUPP; |
| 404 | |
David P. Quigley | ddd29ec | 2009-09-09 14:25:37 -0400 | [diff] [blame] | 405 | /* Special handling for sysfs. Is genfs but also has setxattr handler*/ |
| 406 | if (strncmp(sb->s_type->name, "sysfs", sizeof("sysfs")) == 0) |
| 407 | sbsec->flags |= SE_SBLABELSUPP; |
| 408 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 409 | /* Initialize the root inode. */ |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 410 | rc = inode_doinit_with_dentry(root_inode, root); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 411 | |
| 412 | /* Initialize any other inodes associated with the superblock, e.g. |
| 413 | inodes created prior to initial policy load or inodes created |
| 414 | during get_sb by a pseudo filesystem that directly |
| 415 | populates itself. */ |
| 416 | spin_lock(&sbsec->isec_lock); |
| 417 | next_inode: |
| 418 | if (!list_empty(&sbsec->isec_head)) { |
| 419 | struct inode_security_struct *isec = |
| 420 | list_entry(sbsec->isec_head.next, |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 421 | struct inode_security_struct, list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 422 | struct inode *inode = isec->inode; |
| 423 | spin_unlock(&sbsec->isec_lock); |
| 424 | inode = igrab(inode); |
| 425 | if (inode) { |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 426 | if (!IS_PRIVATE(inode)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 427 | inode_doinit(inode); |
| 428 | iput(inode); |
| 429 | } |
| 430 | spin_lock(&sbsec->isec_lock); |
| 431 | list_del_init(&isec->list); |
| 432 | goto next_inode; |
| 433 | } |
| 434 | spin_unlock(&sbsec->isec_lock); |
| 435 | out: |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 436 | return rc; |
| 437 | } |
| 438 | |
| 439 | /* |
| 440 | * This function should allow an FS to ask what it's mount security |
| 441 | * options were so it can use those later for submounts, displaying |
| 442 | * mount options, or whatever. |
| 443 | */ |
| 444 | static int selinux_get_mnt_opts(const struct super_block *sb, |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 445 | struct security_mnt_opts *opts) |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 446 | { |
| 447 | int rc = 0, i; |
| 448 | struct superblock_security_struct *sbsec = sb->s_security; |
| 449 | char *context = NULL; |
| 450 | u32 len; |
| 451 | char tmp; |
| 452 | |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 453 | security_init_mnt_opts(opts); |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 454 | |
David P. Quigley | 0d90a7e | 2009-01-16 09:22:02 -0500 | [diff] [blame] | 455 | if (!(sbsec->flags & SE_SBINITIALIZED)) |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 456 | return -EINVAL; |
| 457 | |
| 458 | if (!ss_initialized) |
| 459 | return -EINVAL; |
| 460 | |
David P. Quigley | 0d90a7e | 2009-01-16 09:22:02 -0500 | [diff] [blame] | 461 | tmp = sbsec->flags & SE_MNTMASK; |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 462 | /* count the number of mount options for this sb */ |
| 463 | for (i = 0; i < 8; i++) { |
| 464 | if (tmp & 0x01) |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 465 | opts->num_mnt_opts++; |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 466 | tmp >>= 1; |
| 467 | } |
David P. Quigley | 11689d4 | 2009-01-16 09:22:03 -0500 | [diff] [blame] | 468 | /* Check if the Label support flag is set */ |
| 469 | if (sbsec->flags & SE_SBLABELSUPP) |
| 470 | opts->num_mnt_opts++; |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 471 | |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 472 | opts->mnt_opts = kcalloc(opts->num_mnt_opts, sizeof(char *), GFP_ATOMIC); |
| 473 | if (!opts->mnt_opts) { |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 474 | rc = -ENOMEM; |
| 475 | goto out_free; |
| 476 | } |
| 477 | |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 478 | opts->mnt_opts_flags = kcalloc(opts->num_mnt_opts, sizeof(int), GFP_ATOMIC); |
| 479 | if (!opts->mnt_opts_flags) { |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 480 | rc = -ENOMEM; |
| 481 | goto out_free; |
| 482 | } |
| 483 | |
| 484 | i = 0; |
| 485 | if (sbsec->flags & FSCONTEXT_MNT) { |
| 486 | rc = security_sid_to_context(sbsec->sid, &context, &len); |
| 487 | if (rc) |
| 488 | goto out_free; |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 489 | opts->mnt_opts[i] = context; |
| 490 | opts->mnt_opts_flags[i++] = FSCONTEXT_MNT; |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 491 | } |
| 492 | if (sbsec->flags & CONTEXT_MNT) { |
| 493 | rc = security_sid_to_context(sbsec->mntpoint_sid, &context, &len); |
| 494 | if (rc) |
| 495 | goto out_free; |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 496 | opts->mnt_opts[i] = context; |
| 497 | opts->mnt_opts_flags[i++] = CONTEXT_MNT; |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 498 | } |
| 499 | if (sbsec->flags & DEFCONTEXT_MNT) { |
| 500 | rc = security_sid_to_context(sbsec->def_sid, &context, &len); |
| 501 | if (rc) |
| 502 | goto out_free; |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 503 | opts->mnt_opts[i] = context; |
| 504 | opts->mnt_opts_flags[i++] = DEFCONTEXT_MNT; |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 505 | } |
| 506 | if (sbsec->flags & ROOTCONTEXT_MNT) { |
| 507 | struct inode *root = sbsec->sb->s_root->d_inode; |
| 508 | struct inode_security_struct *isec = root->i_security; |
| 509 | |
| 510 | rc = security_sid_to_context(isec->sid, &context, &len); |
| 511 | if (rc) |
| 512 | goto out_free; |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 513 | opts->mnt_opts[i] = context; |
| 514 | opts->mnt_opts_flags[i++] = ROOTCONTEXT_MNT; |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 515 | } |
David P. Quigley | 11689d4 | 2009-01-16 09:22:03 -0500 | [diff] [blame] | 516 | if (sbsec->flags & SE_SBLABELSUPP) { |
| 517 | opts->mnt_opts[i] = NULL; |
| 518 | opts->mnt_opts_flags[i++] = SE_SBLABELSUPP; |
| 519 | } |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 520 | |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 521 | BUG_ON(i != opts->num_mnt_opts); |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 522 | |
| 523 | return 0; |
| 524 | |
| 525 | out_free: |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 526 | security_free_mnt_opts(opts); |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 527 | return rc; |
| 528 | } |
| 529 | |
| 530 | static int bad_option(struct superblock_security_struct *sbsec, char flag, |
| 531 | u32 old_sid, u32 new_sid) |
| 532 | { |
David P. Quigley | 0d90a7e | 2009-01-16 09:22:02 -0500 | [diff] [blame] | 533 | char mnt_flags = sbsec->flags & SE_MNTMASK; |
| 534 | |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 535 | /* check if the old mount command had the same options */ |
David P. Quigley | 0d90a7e | 2009-01-16 09:22:02 -0500 | [diff] [blame] | 536 | if (sbsec->flags & SE_SBINITIALIZED) |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 537 | if (!(sbsec->flags & flag) || |
| 538 | (old_sid != new_sid)) |
| 539 | return 1; |
| 540 | |
| 541 | /* check if we were passed the same options twice, |
| 542 | * aka someone passed context=a,context=b |
| 543 | */ |
David P. Quigley | 0d90a7e | 2009-01-16 09:22:02 -0500 | [diff] [blame] | 544 | if (!(sbsec->flags & SE_SBINITIALIZED)) |
| 545 | if (mnt_flags & flag) |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 546 | return 1; |
| 547 | return 0; |
| 548 | } |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 549 | |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 550 | /* |
| 551 | * Allow filesystems with binary mount data to explicitly set mount point |
| 552 | * labeling information. |
| 553 | */ |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 554 | static int selinux_set_mnt_opts(struct super_block *sb, |
| 555 | struct security_mnt_opts *opts) |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 556 | { |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 557 | const struct cred *cred = current_cred(); |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 558 | int rc = 0, i; |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 559 | struct superblock_security_struct *sbsec = sb->s_security; |
| 560 | const char *name = sb->s_type->name; |
James Morris | 089be43 | 2008-07-15 18:32:49 +1000 | [diff] [blame] | 561 | struct inode *inode = sbsec->sb->s_root->d_inode; |
| 562 | struct inode_security_struct *root_isec = inode->i_security; |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 563 | u32 fscontext_sid = 0, context_sid = 0, rootcontext_sid = 0; |
| 564 | u32 defcontext_sid = 0; |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 565 | char **mount_options = opts->mnt_opts; |
| 566 | int *flags = opts->mnt_opts_flags; |
| 567 | int num_opts = opts->num_mnt_opts; |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 568 | |
| 569 | mutex_lock(&sbsec->lock); |
| 570 | |
| 571 | if (!ss_initialized) { |
| 572 | if (!num_opts) { |
| 573 | /* Defer initialization until selinux_complete_init, |
| 574 | after the initial policy is loaded and the security |
| 575 | server is ready to handle calls. */ |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 576 | goto out; |
| 577 | } |
| 578 | rc = -EINVAL; |
Eric Paris | 744ba35 | 2008-04-17 11:52:44 -0400 | [diff] [blame] | 579 | printk(KERN_WARNING "SELinux: Unable to set superblock options " |
| 580 | "before the security server is initialized\n"); |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 581 | goto out; |
| 582 | } |
| 583 | |
| 584 | /* |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 585 | * Binary mount data FS will come through this function twice. Once |
| 586 | * from an explicit call and once from the generic calls from the vfs. |
| 587 | * Since the generic VFS calls will not contain any security mount data |
| 588 | * we need to skip the double mount verification. |
| 589 | * |
| 590 | * This does open a hole in which we will not notice if the first |
| 591 | * mount using this sb set explict options and a second mount using |
| 592 | * this sb does not set any security options. (The first options |
| 593 | * will be used for both mounts) |
| 594 | */ |
David P. Quigley | 0d90a7e | 2009-01-16 09:22:02 -0500 | [diff] [blame] | 595 | 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] | 596 | && (num_opts == 0)) |
Eric Paris | f526971 | 2008-05-14 11:27:45 -0400 | [diff] [blame] | 597 | goto out; |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 598 | |
| 599 | /* |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 600 | * parse the mount options, check if they are valid sids. |
| 601 | * also check if someone is trying to mount the same sb more |
| 602 | * than once with different security options. |
| 603 | */ |
| 604 | for (i = 0; i < num_opts; i++) { |
| 605 | u32 sid; |
David P. Quigley | 11689d4 | 2009-01-16 09:22:03 -0500 | [diff] [blame] | 606 | |
| 607 | if (flags[i] == SE_SBLABELSUPP) |
| 608 | continue; |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 609 | rc = security_context_to_sid(mount_options[i], |
| 610 | strlen(mount_options[i]), &sid); |
| 611 | if (rc) { |
| 612 | printk(KERN_WARNING "SELinux: security_context_to_sid" |
| 613 | "(%s) failed for (dev %s, type %s) errno=%d\n", |
| 614 | mount_options[i], sb->s_id, name, rc); |
| 615 | goto out; |
| 616 | } |
| 617 | switch (flags[i]) { |
| 618 | case FSCONTEXT_MNT: |
| 619 | fscontext_sid = sid; |
| 620 | |
| 621 | if (bad_option(sbsec, FSCONTEXT_MNT, sbsec->sid, |
| 622 | fscontext_sid)) |
| 623 | goto out_double_mount; |
| 624 | |
| 625 | sbsec->flags |= FSCONTEXT_MNT; |
| 626 | break; |
| 627 | case CONTEXT_MNT: |
| 628 | context_sid = sid; |
| 629 | |
| 630 | if (bad_option(sbsec, CONTEXT_MNT, sbsec->mntpoint_sid, |
| 631 | context_sid)) |
| 632 | goto out_double_mount; |
| 633 | |
| 634 | sbsec->flags |= CONTEXT_MNT; |
| 635 | break; |
| 636 | case ROOTCONTEXT_MNT: |
| 637 | rootcontext_sid = sid; |
| 638 | |
| 639 | if (bad_option(sbsec, ROOTCONTEXT_MNT, root_isec->sid, |
| 640 | rootcontext_sid)) |
| 641 | goto out_double_mount; |
| 642 | |
| 643 | sbsec->flags |= ROOTCONTEXT_MNT; |
| 644 | |
| 645 | break; |
| 646 | case DEFCONTEXT_MNT: |
| 647 | defcontext_sid = sid; |
| 648 | |
| 649 | if (bad_option(sbsec, DEFCONTEXT_MNT, sbsec->def_sid, |
| 650 | defcontext_sid)) |
| 651 | goto out_double_mount; |
| 652 | |
| 653 | sbsec->flags |= DEFCONTEXT_MNT; |
| 654 | |
| 655 | break; |
| 656 | default: |
| 657 | rc = -EINVAL; |
| 658 | goto out; |
| 659 | } |
| 660 | } |
| 661 | |
David P. Quigley | 0d90a7e | 2009-01-16 09:22:02 -0500 | [diff] [blame] | 662 | if (sbsec->flags & SE_SBINITIALIZED) { |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 663 | /* previously mounted with options, but not on this attempt? */ |
David P. Quigley | 0d90a7e | 2009-01-16 09:22:02 -0500 | [diff] [blame] | 664 | if ((sbsec->flags & SE_MNTMASK) && !num_opts) |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 665 | goto out_double_mount; |
| 666 | rc = 0; |
| 667 | goto out; |
| 668 | } |
| 669 | |
James Morris | 089be43 | 2008-07-15 18:32:49 +1000 | [diff] [blame] | 670 | if (strcmp(sb->s_type->name, "proc") == 0) |
David P. Quigley | 0d90a7e | 2009-01-16 09:22:02 -0500 | [diff] [blame] | 671 | sbsec->flags |= SE_SBPROC; |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 672 | |
| 673 | /* Determine the labeling behavior to use for this filesystem type. */ |
David P. Quigley | 0d90a7e | 2009-01-16 09:22:02 -0500 | [diff] [blame] | 674 | rc = security_fs_use((sbsec->flags & SE_SBPROC) ? "proc" : sb->s_type->name, &sbsec->behavior, &sbsec->sid); |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 675 | if (rc) { |
| 676 | printk(KERN_WARNING "%s: security_fs_use(%s) returned %d\n", |
James Morris | 089be43 | 2008-07-15 18:32:49 +1000 | [diff] [blame] | 677 | __func__, sb->s_type->name, rc); |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 678 | goto out; |
| 679 | } |
| 680 | |
| 681 | /* sets the context of the superblock for the fs being mounted. */ |
| 682 | if (fscontext_sid) { |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 683 | rc = may_context_mount_sb_relabel(fscontext_sid, sbsec, cred); |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 684 | if (rc) |
| 685 | goto out; |
| 686 | |
| 687 | sbsec->sid = fscontext_sid; |
| 688 | } |
| 689 | |
| 690 | /* |
| 691 | * Switch to using mount point labeling behavior. |
| 692 | * sets the label used on all file below the mountpoint, and will set |
| 693 | * the superblock context if not already set. |
| 694 | */ |
| 695 | if (context_sid) { |
| 696 | if (!fscontext_sid) { |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 697 | rc = may_context_mount_sb_relabel(context_sid, sbsec, |
| 698 | cred); |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 699 | if (rc) |
| 700 | goto out; |
| 701 | sbsec->sid = context_sid; |
| 702 | } else { |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 703 | rc = may_context_mount_inode_relabel(context_sid, sbsec, |
| 704 | cred); |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 705 | if (rc) |
| 706 | goto out; |
| 707 | } |
| 708 | if (!rootcontext_sid) |
| 709 | rootcontext_sid = context_sid; |
| 710 | |
| 711 | sbsec->mntpoint_sid = context_sid; |
| 712 | sbsec->behavior = SECURITY_FS_USE_MNTPOINT; |
| 713 | } |
| 714 | |
| 715 | if (rootcontext_sid) { |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 716 | rc = may_context_mount_inode_relabel(rootcontext_sid, sbsec, |
| 717 | cred); |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 718 | if (rc) |
| 719 | goto out; |
| 720 | |
| 721 | root_isec->sid = rootcontext_sid; |
| 722 | root_isec->initialized = 1; |
| 723 | } |
| 724 | |
| 725 | if (defcontext_sid) { |
| 726 | if (sbsec->behavior != SECURITY_FS_USE_XATTR) { |
| 727 | rc = -EINVAL; |
| 728 | printk(KERN_WARNING "SELinux: defcontext option is " |
| 729 | "invalid for this filesystem type\n"); |
| 730 | goto out; |
| 731 | } |
| 732 | |
| 733 | if (defcontext_sid != sbsec->def_sid) { |
| 734 | rc = may_context_mount_inode_relabel(defcontext_sid, |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 735 | sbsec, cred); |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 736 | if (rc) |
| 737 | goto out; |
| 738 | } |
| 739 | |
| 740 | sbsec->def_sid = defcontext_sid; |
| 741 | } |
| 742 | |
| 743 | rc = sb_finish_set_opts(sb); |
| 744 | out: |
Eric Paris | bc7e982 | 2006-09-25 23:32:02 -0700 | [diff] [blame] | 745 | mutex_unlock(&sbsec->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 746 | return rc; |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 747 | out_double_mount: |
| 748 | rc = -EINVAL; |
| 749 | printk(KERN_WARNING "SELinux: mount invalid. Same superblock, different " |
| 750 | "security settings for (dev %s, type %s)\n", sb->s_id, name); |
| 751 | goto out; |
| 752 | } |
| 753 | |
Jeff Layton | 094f7b6 | 2013-04-01 08:14:24 -0400 | [diff] [blame] | 754 | static int selinux_cmp_sb_context(const struct super_block *oldsb, |
| 755 | const struct super_block *newsb) |
| 756 | { |
| 757 | struct superblock_security_struct *old = oldsb->s_security; |
| 758 | struct superblock_security_struct *new = newsb->s_security; |
| 759 | char oldflags = old->flags & SE_MNTMASK; |
| 760 | char newflags = new->flags & SE_MNTMASK; |
| 761 | |
| 762 | if (oldflags != newflags) |
| 763 | goto mismatch; |
| 764 | if ((oldflags & FSCONTEXT_MNT) && old->sid != new->sid) |
| 765 | goto mismatch; |
| 766 | if ((oldflags & CONTEXT_MNT) && old->mntpoint_sid != new->mntpoint_sid) |
| 767 | goto mismatch; |
| 768 | if ((oldflags & DEFCONTEXT_MNT) && old->def_sid != new->def_sid) |
| 769 | goto mismatch; |
| 770 | if (oldflags & ROOTCONTEXT_MNT) { |
| 771 | struct inode_security_struct *oldroot = oldsb->s_root->d_inode->i_security; |
| 772 | struct inode_security_struct *newroot = newsb->s_root->d_inode->i_security; |
| 773 | if (oldroot->sid != newroot->sid) |
| 774 | goto mismatch; |
| 775 | } |
| 776 | return 0; |
| 777 | mismatch: |
| 778 | printk(KERN_WARNING "SELinux: mount invalid. Same superblock, " |
| 779 | "different security settings for (dev %s, " |
| 780 | "type %s)\n", newsb->s_id, newsb->s_type->name); |
| 781 | return -EBUSY; |
| 782 | } |
| 783 | |
| 784 | static int selinux_sb_clone_mnt_opts(const struct super_block *oldsb, |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 785 | struct super_block *newsb) |
| 786 | { |
| 787 | const struct superblock_security_struct *oldsbsec = oldsb->s_security; |
| 788 | struct superblock_security_struct *newsbsec = newsb->s_security; |
| 789 | |
| 790 | int set_fscontext = (oldsbsec->flags & FSCONTEXT_MNT); |
| 791 | int set_context = (oldsbsec->flags & CONTEXT_MNT); |
| 792 | int set_rootcontext = (oldsbsec->flags & ROOTCONTEXT_MNT); |
| 793 | |
Eric Paris | 0f5e642 | 2008-04-21 16:24:11 -0400 | [diff] [blame] | 794 | /* |
| 795 | * 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] | 796 | * mount options. thus we can safely deal with this superblock later |
Eric Paris | 0f5e642 | 2008-04-21 16:24:11 -0400 | [diff] [blame] | 797 | */ |
Al Viro | e8c2625 | 2010-03-23 06:36:54 -0400 | [diff] [blame] | 798 | if (!ss_initialized) |
Jeff Layton | 094f7b6 | 2013-04-01 08:14:24 -0400 | [diff] [blame] | 799 | return 0; |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 800 | |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 801 | /* 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] | 802 | BUG_ON(!(oldsbsec->flags & SE_SBINITIALIZED)); |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 803 | |
Jeff Layton | 094f7b6 | 2013-04-01 08:14:24 -0400 | [diff] [blame] | 804 | /* 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] | 805 | if (newsbsec->flags & SE_SBINITIALIZED) |
Jeff Layton | 094f7b6 | 2013-04-01 08:14:24 -0400 | [diff] [blame] | 806 | return selinux_cmp_sb_context(oldsb, newsb); |
Eric Paris | 5a55261 | 2008-04-09 14:08:35 -0400 | [diff] [blame] | 807 | |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 808 | mutex_lock(&newsbsec->lock); |
| 809 | |
| 810 | newsbsec->flags = oldsbsec->flags; |
| 811 | |
| 812 | newsbsec->sid = oldsbsec->sid; |
| 813 | newsbsec->def_sid = oldsbsec->def_sid; |
| 814 | newsbsec->behavior = oldsbsec->behavior; |
| 815 | |
| 816 | if (set_context) { |
| 817 | u32 sid = oldsbsec->mntpoint_sid; |
| 818 | |
| 819 | if (!set_fscontext) |
| 820 | newsbsec->sid = sid; |
| 821 | if (!set_rootcontext) { |
| 822 | struct inode *newinode = newsb->s_root->d_inode; |
| 823 | struct inode_security_struct *newisec = newinode->i_security; |
| 824 | newisec->sid = sid; |
| 825 | } |
| 826 | newsbsec->mntpoint_sid = sid; |
| 827 | } |
| 828 | if (set_rootcontext) { |
| 829 | const struct inode *oldinode = oldsb->s_root->d_inode; |
| 830 | const struct inode_security_struct *oldisec = oldinode->i_security; |
| 831 | struct inode *newinode = newsb->s_root->d_inode; |
| 832 | struct inode_security_struct *newisec = newinode->i_security; |
| 833 | |
| 834 | newisec->sid = oldisec->sid; |
| 835 | } |
| 836 | |
| 837 | sb_finish_set_opts(newsb); |
| 838 | mutex_unlock(&newsbsec->lock); |
Jeff Layton | 094f7b6 | 2013-04-01 08:14:24 -0400 | [diff] [blame] | 839 | return 0; |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 840 | } |
| 841 | |
Adrian Bunk | 2e1479d | 2008-03-17 22:29:23 +0200 | [diff] [blame] | 842 | static int selinux_parse_opts_str(char *options, |
| 843 | struct security_mnt_opts *opts) |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 844 | { |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 845 | char *p; |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 846 | char *context = NULL, *defcontext = NULL; |
| 847 | char *fscontext = NULL, *rootcontext = NULL; |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 848 | int rc, num_mnt_opts = 0; |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 849 | |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 850 | opts->num_mnt_opts = 0; |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 851 | |
| 852 | /* Standard string-based options. */ |
| 853 | while ((p = strsep(&options, "|")) != NULL) { |
| 854 | int token; |
| 855 | substring_t args[MAX_OPT_ARGS]; |
| 856 | |
| 857 | if (!*p) |
| 858 | continue; |
| 859 | |
| 860 | token = match_token(p, tokens, args); |
| 861 | |
| 862 | switch (token) { |
| 863 | case Opt_context: |
| 864 | if (context || defcontext) { |
| 865 | rc = -EINVAL; |
| 866 | printk(KERN_WARNING SEL_MOUNT_FAIL_MSG); |
| 867 | goto out_err; |
| 868 | } |
| 869 | context = match_strdup(&args[0]); |
| 870 | if (!context) { |
| 871 | rc = -ENOMEM; |
| 872 | goto out_err; |
| 873 | } |
| 874 | break; |
| 875 | |
| 876 | case Opt_fscontext: |
| 877 | if (fscontext) { |
| 878 | rc = -EINVAL; |
| 879 | printk(KERN_WARNING SEL_MOUNT_FAIL_MSG); |
| 880 | goto out_err; |
| 881 | } |
| 882 | fscontext = match_strdup(&args[0]); |
| 883 | if (!fscontext) { |
| 884 | rc = -ENOMEM; |
| 885 | goto out_err; |
| 886 | } |
| 887 | break; |
| 888 | |
| 889 | case Opt_rootcontext: |
| 890 | if (rootcontext) { |
| 891 | rc = -EINVAL; |
| 892 | printk(KERN_WARNING SEL_MOUNT_FAIL_MSG); |
| 893 | goto out_err; |
| 894 | } |
| 895 | rootcontext = match_strdup(&args[0]); |
| 896 | if (!rootcontext) { |
| 897 | rc = -ENOMEM; |
| 898 | goto out_err; |
| 899 | } |
| 900 | break; |
| 901 | |
| 902 | case Opt_defcontext: |
| 903 | if (context || defcontext) { |
| 904 | rc = -EINVAL; |
| 905 | printk(KERN_WARNING SEL_MOUNT_FAIL_MSG); |
| 906 | goto out_err; |
| 907 | } |
| 908 | defcontext = match_strdup(&args[0]); |
| 909 | if (!defcontext) { |
| 910 | rc = -ENOMEM; |
| 911 | goto out_err; |
| 912 | } |
| 913 | break; |
David P. Quigley | 11689d4 | 2009-01-16 09:22:03 -0500 | [diff] [blame] | 914 | case Opt_labelsupport: |
| 915 | break; |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 916 | default: |
| 917 | rc = -EINVAL; |
| 918 | printk(KERN_WARNING "SELinux: unknown mount option\n"); |
| 919 | goto out_err; |
| 920 | |
| 921 | } |
| 922 | } |
| 923 | |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 924 | rc = -ENOMEM; |
| 925 | opts->mnt_opts = kcalloc(NUM_SEL_MNT_OPTS, sizeof(char *), GFP_ATOMIC); |
| 926 | if (!opts->mnt_opts) |
| 927 | goto out_err; |
| 928 | |
| 929 | opts->mnt_opts_flags = kcalloc(NUM_SEL_MNT_OPTS, sizeof(int), GFP_ATOMIC); |
| 930 | if (!opts->mnt_opts_flags) { |
| 931 | kfree(opts->mnt_opts); |
| 932 | goto out_err; |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 933 | } |
| 934 | |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 935 | if (fscontext) { |
| 936 | opts->mnt_opts[num_mnt_opts] = fscontext; |
| 937 | opts->mnt_opts_flags[num_mnt_opts++] = FSCONTEXT_MNT; |
| 938 | } |
| 939 | if (context) { |
| 940 | opts->mnt_opts[num_mnt_opts] = context; |
| 941 | opts->mnt_opts_flags[num_mnt_opts++] = CONTEXT_MNT; |
| 942 | } |
| 943 | if (rootcontext) { |
| 944 | opts->mnt_opts[num_mnt_opts] = rootcontext; |
| 945 | opts->mnt_opts_flags[num_mnt_opts++] = ROOTCONTEXT_MNT; |
| 946 | } |
| 947 | if (defcontext) { |
| 948 | opts->mnt_opts[num_mnt_opts] = defcontext; |
| 949 | opts->mnt_opts_flags[num_mnt_opts++] = DEFCONTEXT_MNT; |
| 950 | } |
| 951 | |
| 952 | opts->num_mnt_opts = num_mnt_opts; |
| 953 | return 0; |
| 954 | |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 955 | out_err: |
| 956 | kfree(context); |
| 957 | kfree(defcontext); |
| 958 | kfree(fscontext); |
| 959 | kfree(rootcontext); |
| 960 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 961 | } |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 962 | /* |
| 963 | * string mount options parsing and call set the sbsec |
| 964 | */ |
| 965 | static int superblock_doinit(struct super_block *sb, void *data) |
| 966 | { |
| 967 | int rc = 0; |
| 968 | char *options = data; |
| 969 | struct security_mnt_opts opts; |
| 970 | |
| 971 | security_init_mnt_opts(&opts); |
| 972 | |
| 973 | if (!data) |
| 974 | goto out; |
| 975 | |
| 976 | BUG_ON(sb->s_type->fs_flags & FS_BINARY_MOUNTDATA); |
| 977 | |
| 978 | rc = selinux_parse_opts_str(options, &opts); |
| 979 | if (rc) |
| 980 | goto out_err; |
| 981 | |
| 982 | out: |
| 983 | rc = selinux_set_mnt_opts(sb, &opts); |
| 984 | |
| 985 | out_err: |
| 986 | security_free_mnt_opts(&opts); |
| 987 | return rc; |
| 988 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 989 | |
Adrian Bunk | 3583a71 | 2008-07-22 20:21:23 +0300 | [diff] [blame] | 990 | static void selinux_write_opts(struct seq_file *m, |
| 991 | struct security_mnt_opts *opts) |
Eric Paris | 2069f45 | 2008-07-04 09:47:13 +1000 | [diff] [blame] | 992 | { |
| 993 | int i; |
| 994 | char *prefix; |
| 995 | |
| 996 | for (i = 0; i < opts->num_mnt_opts; i++) { |
David P. Quigley | 11689d4 | 2009-01-16 09:22:03 -0500 | [diff] [blame] | 997 | char *has_comma; |
| 998 | |
| 999 | if (opts->mnt_opts[i]) |
| 1000 | has_comma = strchr(opts->mnt_opts[i], ','); |
| 1001 | else |
| 1002 | has_comma = NULL; |
Eric Paris | 2069f45 | 2008-07-04 09:47:13 +1000 | [diff] [blame] | 1003 | |
| 1004 | switch (opts->mnt_opts_flags[i]) { |
| 1005 | case CONTEXT_MNT: |
| 1006 | prefix = CONTEXT_STR; |
| 1007 | break; |
| 1008 | case FSCONTEXT_MNT: |
| 1009 | prefix = FSCONTEXT_STR; |
| 1010 | break; |
| 1011 | case ROOTCONTEXT_MNT: |
| 1012 | prefix = ROOTCONTEXT_STR; |
| 1013 | break; |
| 1014 | case DEFCONTEXT_MNT: |
| 1015 | prefix = DEFCONTEXT_STR; |
| 1016 | break; |
David P. Quigley | 11689d4 | 2009-01-16 09:22:03 -0500 | [diff] [blame] | 1017 | case SE_SBLABELSUPP: |
| 1018 | seq_putc(m, ','); |
| 1019 | seq_puts(m, LABELSUPP_STR); |
| 1020 | continue; |
Eric Paris | 2069f45 | 2008-07-04 09:47:13 +1000 | [diff] [blame] | 1021 | default: |
| 1022 | BUG(); |
Eric Paris | a35c6c8 | 2011-04-20 10:21:28 -0400 | [diff] [blame] | 1023 | return; |
Eric Paris | 2069f45 | 2008-07-04 09:47:13 +1000 | [diff] [blame] | 1024 | }; |
| 1025 | /* we need a comma before each option */ |
| 1026 | seq_putc(m, ','); |
| 1027 | seq_puts(m, prefix); |
| 1028 | if (has_comma) |
| 1029 | seq_putc(m, '\"'); |
| 1030 | seq_puts(m, opts->mnt_opts[i]); |
| 1031 | if (has_comma) |
| 1032 | seq_putc(m, '\"'); |
| 1033 | } |
| 1034 | } |
| 1035 | |
| 1036 | static int selinux_sb_show_options(struct seq_file *m, struct super_block *sb) |
| 1037 | { |
| 1038 | struct security_mnt_opts opts; |
| 1039 | int rc; |
| 1040 | |
| 1041 | rc = selinux_get_mnt_opts(sb, &opts); |
Eric Paris | 383795c | 2008-07-29 17:07:26 -0400 | [diff] [blame] | 1042 | if (rc) { |
| 1043 | /* before policy load we may get EINVAL, don't show anything */ |
| 1044 | if (rc == -EINVAL) |
| 1045 | rc = 0; |
Eric Paris | 2069f45 | 2008-07-04 09:47:13 +1000 | [diff] [blame] | 1046 | return rc; |
Eric Paris | 383795c | 2008-07-29 17:07:26 -0400 | [diff] [blame] | 1047 | } |
Eric Paris | 2069f45 | 2008-07-04 09:47:13 +1000 | [diff] [blame] | 1048 | |
| 1049 | selinux_write_opts(m, &opts); |
| 1050 | |
| 1051 | security_free_mnt_opts(&opts); |
| 1052 | |
| 1053 | return rc; |
| 1054 | } |
| 1055 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1056 | static inline u16 inode_mode_to_security_class(umode_t mode) |
| 1057 | { |
| 1058 | switch (mode & S_IFMT) { |
| 1059 | case S_IFSOCK: |
| 1060 | return SECCLASS_SOCK_FILE; |
| 1061 | case S_IFLNK: |
| 1062 | return SECCLASS_LNK_FILE; |
| 1063 | case S_IFREG: |
| 1064 | return SECCLASS_FILE; |
| 1065 | case S_IFBLK: |
| 1066 | return SECCLASS_BLK_FILE; |
| 1067 | case S_IFDIR: |
| 1068 | return SECCLASS_DIR; |
| 1069 | case S_IFCHR: |
| 1070 | return SECCLASS_CHR_FILE; |
| 1071 | case S_IFIFO: |
| 1072 | return SECCLASS_FIFO_FILE; |
| 1073 | |
| 1074 | } |
| 1075 | |
| 1076 | return SECCLASS_FILE; |
| 1077 | } |
| 1078 | |
James Morris | 1340258 | 2005-09-30 14:24:34 -0400 | [diff] [blame] | 1079 | static inline int default_protocol_stream(int protocol) |
| 1080 | { |
| 1081 | return (protocol == IPPROTO_IP || protocol == IPPROTO_TCP); |
| 1082 | } |
| 1083 | |
| 1084 | static inline int default_protocol_dgram(int protocol) |
| 1085 | { |
| 1086 | return (protocol == IPPROTO_IP || protocol == IPPROTO_UDP); |
| 1087 | } |
| 1088 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1089 | static inline u16 socket_type_to_security_class(int family, int type, int protocol) |
| 1090 | { |
| 1091 | switch (family) { |
| 1092 | case PF_UNIX: |
| 1093 | switch (type) { |
| 1094 | case SOCK_STREAM: |
| 1095 | case SOCK_SEQPACKET: |
| 1096 | return SECCLASS_UNIX_STREAM_SOCKET; |
| 1097 | case SOCK_DGRAM: |
| 1098 | return SECCLASS_UNIX_DGRAM_SOCKET; |
| 1099 | } |
| 1100 | break; |
| 1101 | case PF_INET: |
| 1102 | case PF_INET6: |
| 1103 | switch (type) { |
| 1104 | case SOCK_STREAM: |
James Morris | 1340258 | 2005-09-30 14:24:34 -0400 | [diff] [blame] | 1105 | if (default_protocol_stream(protocol)) |
| 1106 | return SECCLASS_TCP_SOCKET; |
| 1107 | else |
| 1108 | return SECCLASS_RAWIP_SOCKET; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1109 | case SOCK_DGRAM: |
James Morris | 1340258 | 2005-09-30 14:24:34 -0400 | [diff] [blame] | 1110 | if (default_protocol_dgram(protocol)) |
| 1111 | return SECCLASS_UDP_SOCKET; |
| 1112 | else |
| 1113 | return SECCLASS_RAWIP_SOCKET; |
James Morris | 2ee92d4 | 2006-11-13 16:09:01 -0800 | [diff] [blame] | 1114 | case SOCK_DCCP: |
| 1115 | return SECCLASS_DCCP_SOCKET; |
James Morris | 1340258 | 2005-09-30 14:24:34 -0400 | [diff] [blame] | 1116 | default: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1117 | return SECCLASS_RAWIP_SOCKET; |
| 1118 | } |
| 1119 | break; |
| 1120 | case PF_NETLINK: |
| 1121 | switch (protocol) { |
| 1122 | case NETLINK_ROUTE: |
| 1123 | return SECCLASS_NETLINK_ROUTE_SOCKET; |
| 1124 | case NETLINK_FIREWALL: |
| 1125 | return SECCLASS_NETLINK_FIREWALL_SOCKET; |
Pavel Emelyanov | 7f1fb60 | 2011-12-06 07:56:43 +0000 | [diff] [blame] | 1126 | case NETLINK_SOCK_DIAG: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1127 | return SECCLASS_NETLINK_TCPDIAG_SOCKET; |
| 1128 | case NETLINK_NFLOG: |
| 1129 | return SECCLASS_NETLINK_NFLOG_SOCKET; |
| 1130 | case NETLINK_XFRM: |
| 1131 | return SECCLASS_NETLINK_XFRM_SOCKET; |
| 1132 | case NETLINK_SELINUX: |
| 1133 | return SECCLASS_NETLINK_SELINUX_SOCKET; |
| 1134 | case NETLINK_AUDIT: |
| 1135 | return SECCLASS_NETLINK_AUDIT_SOCKET; |
| 1136 | case NETLINK_IP6_FW: |
| 1137 | return SECCLASS_NETLINK_IP6FW_SOCKET; |
| 1138 | case NETLINK_DNRTMSG: |
| 1139 | return SECCLASS_NETLINK_DNRT_SOCKET; |
James Morris | 0c9b794 | 2005-04-16 15:24:13 -0700 | [diff] [blame] | 1140 | case NETLINK_KOBJECT_UEVENT: |
| 1141 | return SECCLASS_NETLINK_KOBJECT_UEVENT_SOCKET; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1142 | default: |
| 1143 | return SECCLASS_NETLINK_SOCKET; |
| 1144 | } |
| 1145 | case PF_PACKET: |
| 1146 | return SECCLASS_PACKET_SOCKET; |
| 1147 | case PF_KEY: |
| 1148 | return SECCLASS_KEY_SOCKET; |
Christopher J. PeBenito | 3e3ff15 | 2006-06-09 00:25:03 -0700 | [diff] [blame] | 1149 | case PF_APPLETALK: |
| 1150 | return SECCLASS_APPLETALK_SOCKET; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1151 | } |
| 1152 | |
| 1153 | return SECCLASS_SOCKET; |
| 1154 | } |
| 1155 | |
| 1156 | #ifdef CONFIG_PROC_FS |
Lucian Adrian Grijincu | 8e6c969 | 2011-02-01 18:42:22 +0200 | [diff] [blame] | 1157 | static int selinux_proc_get_sid(struct dentry *dentry, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1158 | u16 tclass, |
| 1159 | u32 *sid) |
| 1160 | { |
Lucian Adrian Grijincu | 8e6c969 | 2011-02-01 18:42:22 +0200 | [diff] [blame] | 1161 | int rc; |
| 1162 | char *buffer, *path; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1163 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 1164 | buffer = (char *)__get_free_page(GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1165 | if (!buffer) |
| 1166 | return -ENOMEM; |
| 1167 | |
Lucian Adrian Grijincu | 8e6c969 | 2011-02-01 18:42:22 +0200 | [diff] [blame] | 1168 | path = dentry_path_raw(dentry, buffer, PAGE_SIZE); |
| 1169 | if (IS_ERR(path)) |
| 1170 | rc = PTR_ERR(path); |
| 1171 | else { |
| 1172 | /* each process gets a /proc/PID/ entry. Strip off the |
| 1173 | * PID part to get a valid selinux labeling. |
| 1174 | * e.g. /proc/1/net/rpc/nfs -> /net/rpc/nfs */ |
| 1175 | while (path[1] >= '0' && path[1] <= '9') { |
| 1176 | path[1] = '/'; |
| 1177 | path++; |
| 1178 | } |
| 1179 | rc = security_genfs_sid("proc", path, tclass, sid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1180 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1181 | free_page((unsigned long)buffer); |
| 1182 | return rc; |
| 1183 | } |
| 1184 | #else |
Lucian Adrian Grijincu | 8e6c969 | 2011-02-01 18:42:22 +0200 | [diff] [blame] | 1185 | static int selinux_proc_get_sid(struct dentry *dentry, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1186 | u16 tclass, |
| 1187 | u32 *sid) |
| 1188 | { |
| 1189 | return -EINVAL; |
| 1190 | } |
| 1191 | #endif |
| 1192 | |
| 1193 | /* The inode's security attributes must be initialized before first use. */ |
| 1194 | static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dentry) |
| 1195 | { |
| 1196 | struct superblock_security_struct *sbsec = NULL; |
| 1197 | struct inode_security_struct *isec = inode->i_security; |
| 1198 | u32 sid; |
| 1199 | struct dentry *dentry; |
| 1200 | #define INITCONTEXTLEN 255 |
| 1201 | char *context = NULL; |
| 1202 | unsigned len = 0; |
| 1203 | int rc = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1204 | |
| 1205 | if (isec->initialized) |
| 1206 | goto out; |
| 1207 | |
Eric Paris | 2397074 | 2006-09-25 23:32:01 -0700 | [diff] [blame] | 1208 | mutex_lock(&isec->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1209 | if (isec->initialized) |
Eric Paris | 2397074 | 2006-09-25 23:32:01 -0700 | [diff] [blame] | 1210 | goto out_unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1211 | |
| 1212 | sbsec = inode->i_sb->s_security; |
David P. Quigley | 0d90a7e | 2009-01-16 09:22:02 -0500 | [diff] [blame] | 1213 | if (!(sbsec->flags & SE_SBINITIALIZED)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1214 | /* Defer initialization until selinux_complete_init, |
| 1215 | after the initial policy is loaded and the security |
| 1216 | server is ready to handle calls. */ |
| 1217 | spin_lock(&sbsec->isec_lock); |
| 1218 | if (list_empty(&isec->list)) |
| 1219 | list_add(&isec->list, &sbsec->isec_head); |
| 1220 | spin_unlock(&sbsec->isec_lock); |
Eric Paris | 2397074 | 2006-09-25 23:32:01 -0700 | [diff] [blame] | 1221 | goto out_unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1222 | } |
| 1223 | |
| 1224 | switch (sbsec->behavior) { |
| 1225 | case SECURITY_FS_USE_XATTR: |
| 1226 | if (!inode->i_op->getxattr) { |
| 1227 | isec->sid = sbsec->def_sid; |
| 1228 | break; |
| 1229 | } |
| 1230 | |
| 1231 | /* Need a dentry, since the xattr API requires one. |
| 1232 | Life would be simpler if we could just pass the inode. */ |
| 1233 | if (opt_dentry) { |
| 1234 | /* Called from d_instantiate or d_splice_alias. */ |
| 1235 | dentry = dget(opt_dentry); |
| 1236 | } else { |
| 1237 | /* Called from selinux_complete_init, try to find a dentry. */ |
| 1238 | dentry = d_find_alias(inode); |
| 1239 | } |
| 1240 | if (!dentry) { |
Eric Paris | df7f54c | 2009-03-09 14:35:58 -0400 | [diff] [blame] | 1241 | /* |
| 1242 | * this is can be hit on boot when a file is accessed |
| 1243 | * before the policy is loaded. When we load policy we |
| 1244 | * may find inodes that have no dentry on the |
| 1245 | * sbsec->isec_head list. No reason to complain as these |
| 1246 | * will get fixed up the next time we go through |
| 1247 | * inode_doinit with a dentry, before these inodes could |
| 1248 | * be used again by userspace. |
| 1249 | */ |
Eric Paris | 2397074 | 2006-09-25 23:32:01 -0700 | [diff] [blame] | 1250 | goto out_unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1251 | } |
| 1252 | |
| 1253 | len = INITCONTEXTLEN; |
Eric Paris | 4cb912f | 2009-02-12 14:50:05 -0500 | [diff] [blame] | 1254 | context = kmalloc(len+1, GFP_NOFS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1255 | if (!context) { |
| 1256 | rc = -ENOMEM; |
| 1257 | dput(dentry); |
Eric Paris | 2397074 | 2006-09-25 23:32:01 -0700 | [diff] [blame] | 1258 | goto out_unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1259 | } |
Eric Paris | 4cb912f | 2009-02-12 14:50:05 -0500 | [diff] [blame] | 1260 | context[len] = '\0'; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1261 | rc = inode->i_op->getxattr(dentry, XATTR_NAME_SELINUX, |
| 1262 | context, len); |
| 1263 | if (rc == -ERANGE) { |
James Morris | 314dabb | 2009-08-10 22:00:13 +1000 | [diff] [blame] | 1264 | kfree(context); |
| 1265 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1266 | /* Need a larger buffer. Query for the right size. */ |
| 1267 | rc = inode->i_op->getxattr(dentry, XATTR_NAME_SELINUX, |
| 1268 | NULL, 0); |
| 1269 | if (rc < 0) { |
| 1270 | dput(dentry); |
Eric Paris | 2397074 | 2006-09-25 23:32:01 -0700 | [diff] [blame] | 1271 | goto out_unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1272 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1273 | len = rc; |
Eric Paris | 4cb912f | 2009-02-12 14:50:05 -0500 | [diff] [blame] | 1274 | context = kmalloc(len+1, GFP_NOFS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1275 | if (!context) { |
| 1276 | rc = -ENOMEM; |
| 1277 | dput(dentry); |
Eric Paris | 2397074 | 2006-09-25 23:32:01 -0700 | [diff] [blame] | 1278 | goto out_unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1279 | } |
Eric Paris | 4cb912f | 2009-02-12 14:50:05 -0500 | [diff] [blame] | 1280 | context[len] = '\0'; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1281 | rc = inode->i_op->getxattr(dentry, |
| 1282 | XATTR_NAME_SELINUX, |
| 1283 | context, len); |
| 1284 | } |
| 1285 | dput(dentry); |
| 1286 | if (rc < 0) { |
| 1287 | if (rc != -ENODATA) { |
Eric Paris | 744ba35 | 2008-04-17 11:52:44 -0400 | [diff] [blame] | 1288 | printk(KERN_WARNING "SELinux: %s: getxattr returned " |
Harvey Harrison | dd6f953 | 2008-03-06 10:03:59 +1100 | [diff] [blame] | 1289 | "%d for dev=%s ino=%ld\n", __func__, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1290 | -rc, inode->i_sb->s_id, inode->i_ino); |
| 1291 | kfree(context); |
Eric Paris | 2397074 | 2006-09-25 23:32:01 -0700 | [diff] [blame] | 1292 | goto out_unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1293 | } |
| 1294 | /* Map ENODATA to the default file SID */ |
| 1295 | sid = sbsec->def_sid; |
| 1296 | rc = 0; |
| 1297 | } else { |
James Morris | f5c1d5b | 2005-07-28 01:07:37 -0700 | [diff] [blame] | 1298 | rc = security_context_to_sid_default(context, rc, &sid, |
Stephen Smalley | 869ab51 | 2008-04-04 08:46:05 -0400 | [diff] [blame] | 1299 | sbsec->def_sid, |
| 1300 | GFP_NOFS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1301 | if (rc) { |
Eric Paris | 4ba0a8a | 2009-02-12 15:01:10 -0500 | [diff] [blame] | 1302 | char *dev = inode->i_sb->s_id; |
| 1303 | unsigned long ino = inode->i_ino; |
| 1304 | |
| 1305 | if (rc == -EINVAL) { |
| 1306 | if (printk_ratelimit()) |
| 1307 | printk(KERN_NOTICE "SELinux: inode=%lu on dev=%s was found to have an invalid " |
| 1308 | "context=%s. This indicates you may need to relabel the inode or the " |
| 1309 | "filesystem in question.\n", ino, dev, context); |
| 1310 | } else { |
| 1311 | printk(KERN_WARNING "SELinux: %s: context_to_sid(%s) " |
| 1312 | "returned %d for dev=%s ino=%ld\n", |
| 1313 | __func__, context, -rc, dev, ino); |
| 1314 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1315 | kfree(context); |
| 1316 | /* Leave with the unlabeled SID */ |
| 1317 | rc = 0; |
| 1318 | break; |
| 1319 | } |
| 1320 | } |
| 1321 | kfree(context); |
| 1322 | isec->sid = sid; |
| 1323 | break; |
| 1324 | case SECURITY_FS_USE_TASK: |
| 1325 | isec->sid = isec->task_sid; |
| 1326 | break; |
| 1327 | case SECURITY_FS_USE_TRANS: |
| 1328 | /* Default to the fs SID. */ |
| 1329 | isec->sid = sbsec->sid; |
| 1330 | |
| 1331 | /* Try to obtain a transition SID. */ |
| 1332 | isec->sclass = inode_mode_to_security_class(inode->i_mode); |
Eric Paris | 652bb9b | 2011-02-01 11:05:40 -0500 | [diff] [blame] | 1333 | rc = security_transition_sid(isec->task_sid, sbsec->sid, |
| 1334 | isec->sclass, NULL, &sid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1335 | if (rc) |
Eric Paris | 2397074 | 2006-09-25 23:32:01 -0700 | [diff] [blame] | 1336 | goto out_unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1337 | isec->sid = sid; |
| 1338 | break; |
Eric Paris | c312feb | 2006-07-10 04:43:53 -0700 | [diff] [blame] | 1339 | case SECURITY_FS_USE_MNTPOINT: |
| 1340 | isec->sid = sbsec->mntpoint_sid; |
| 1341 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1342 | default: |
Eric Paris | c312feb | 2006-07-10 04:43:53 -0700 | [diff] [blame] | 1343 | /* Default to the fs superblock SID. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1344 | isec->sid = sbsec->sid; |
| 1345 | |
David P. Quigley | 0d90a7e | 2009-01-16 09:22:02 -0500 | [diff] [blame] | 1346 | if ((sbsec->flags & SE_SBPROC) && !S_ISLNK(inode->i_mode)) { |
Lucian Adrian Grijincu | 8e6c969 | 2011-02-01 18:42:22 +0200 | [diff] [blame] | 1347 | if (opt_dentry) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1348 | isec->sclass = inode_mode_to_security_class(inode->i_mode); |
Lucian Adrian Grijincu | 8e6c969 | 2011-02-01 18:42:22 +0200 | [diff] [blame] | 1349 | rc = selinux_proc_get_sid(opt_dentry, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1350 | isec->sclass, |
| 1351 | &sid); |
| 1352 | if (rc) |
Eric Paris | 2397074 | 2006-09-25 23:32:01 -0700 | [diff] [blame] | 1353 | goto out_unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1354 | isec->sid = sid; |
| 1355 | } |
| 1356 | } |
| 1357 | break; |
| 1358 | } |
| 1359 | |
| 1360 | isec->initialized = 1; |
| 1361 | |
Eric Paris | 2397074 | 2006-09-25 23:32:01 -0700 | [diff] [blame] | 1362 | out_unlock: |
| 1363 | mutex_unlock(&isec->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1364 | out: |
| 1365 | if (isec->sclass == SECCLASS_FILE) |
| 1366 | isec->sclass = inode_mode_to_security_class(inode->i_mode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1367 | return rc; |
| 1368 | } |
| 1369 | |
| 1370 | /* Convert a Linux signal to an access vector. */ |
| 1371 | static inline u32 signal_to_av(int sig) |
| 1372 | { |
| 1373 | u32 perm = 0; |
| 1374 | |
| 1375 | switch (sig) { |
| 1376 | case SIGCHLD: |
| 1377 | /* Commonly granted from child to parent. */ |
| 1378 | perm = PROCESS__SIGCHLD; |
| 1379 | break; |
| 1380 | case SIGKILL: |
| 1381 | /* Cannot be caught or ignored */ |
| 1382 | perm = PROCESS__SIGKILL; |
| 1383 | break; |
| 1384 | case SIGSTOP: |
| 1385 | /* Cannot be caught or ignored */ |
| 1386 | perm = PROCESS__SIGSTOP; |
| 1387 | break; |
| 1388 | default: |
| 1389 | /* All other signals. */ |
| 1390 | perm = PROCESS__SIGNAL; |
| 1391 | break; |
| 1392 | } |
| 1393 | |
| 1394 | return perm; |
| 1395 | } |
| 1396 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1397 | /* |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 1398 | * Check permission between a pair of credentials |
| 1399 | * fork check, ptrace check, etc. |
| 1400 | */ |
| 1401 | static int cred_has_perm(const struct cred *actor, |
| 1402 | const struct cred *target, |
| 1403 | u32 perms) |
| 1404 | { |
| 1405 | u32 asid = cred_sid(actor), tsid = cred_sid(target); |
| 1406 | |
| 1407 | return avc_has_perm(asid, tsid, SECCLASS_PROCESS, perms, NULL); |
| 1408 | } |
| 1409 | |
| 1410 | /* |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 1411 | * Check permission between a pair of tasks, e.g. signal checks, |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1412 | * fork check, ptrace check, etc. |
| 1413 | * tsk1 is the actor and tsk2 is the target |
David Howells | 3b11a1d | 2008-11-14 10:39:26 +1100 | [diff] [blame] | 1414 | * - this uses the default subjective creds of tsk1 |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1415 | */ |
| 1416 | static int task_has_perm(const struct task_struct *tsk1, |
| 1417 | const struct task_struct *tsk2, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1418 | u32 perms) |
| 1419 | { |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1420 | const struct task_security_struct *__tsec1, *__tsec2; |
| 1421 | u32 sid1, sid2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1422 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1423 | rcu_read_lock(); |
| 1424 | __tsec1 = __task_cred(tsk1)->security; sid1 = __tsec1->sid; |
| 1425 | __tsec2 = __task_cred(tsk2)->security; sid2 = __tsec2->sid; |
| 1426 | rcu_read_unlock(); |
| 1427 | return avc_has_perm(sid1, sid2, SECCLASS_PROCESS, perms, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1428 | } |
| 1429 | |
David Howells | 3b11a1d | 2008-11-14 10:39:26 +1100 | [diff] [blame] | 1430 | /* |
| 1431 | * Check permission between current and another task, e.g. signal checks, |
| 1432 | * fork check, ptrace check, etc. |
| 1433 | * current is the actor and tsk2 is the target |
| 1434 | * - this uses current's subjective creds |
| 1435 | */ |
| 1436 | static int current_has_perm(const struct task_struct *tsk, |
| 1437 | u32 perms) |
| 1438 | { |
| 1439 | u32 sid, tsid; |
| 1440 | |
| 1441 | sid = current_sid(); |
| 1442 | tsid = task_sid(tsk); |
| 1443 | return avc_has_perm(sid, tsid, SECCLASS_PROCESS, perms, NULL); |
| 1444 | } |
| 1445 | |
Stephen Smalley | b68e418 | 2008-02-07 11:21:04 -0500 | [diff] [blame] | 1446 | #if CAP_LAST_CAP > 63 |
| 1447 | #error Fix SELinux to handle capabilities > 63. |
| 1448 | #endif |
| 1449 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1450 | /* Check whether a task is allowed to use a capability. */ |
Eric Paris | 6a9de49 | 2012-01-03 12:25:14 -0500 | [diff] [blame] | 1451 | static int cred_has_capability(const struct cred *cred, |
Eric Paris | 0611216 | 2008-11-11 22:02:50 +1100 | [diff] [blame] | 1452 | int cap, int audit) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1453 | { |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 1454 | struct common_audit_data ad; |
Eric Paris | 0611216 | 2008-11-11 22:02:50 +1100 | [diff] [blame] | 1455 | struct av_decision avd; |
Stephen Smalley | b68e418 | 2008-02-07 11:21:04 -0500 | [diff] [blame] | 1456 | u16 sclass; |
David Howells | 3699c53 | 2009-01-06 22:27:01 +0000 | [diff] [blame] | 1457 | u32 sid = cred_sid(cred); |
Stephen Smalley | b68e418 | 2008-02-07 11:21:04 -0500 | [diff] [blame] | 1458 | u32 av = CAP_TO_MASK(cap); |
Eric Paris | 0611216 | 2008-11-11 22:02:50 +1100 | [diff] [blame] | 1459 | int rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1460 | |
Eric Paris | 50c205f | 2012-04-04 15:01:43 -0400 | [diff] [blame] | 1461 | ad.type = LSM_AUDIT_DATA_CAP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1462 | ad.u.cap = cap; |
| 1463 | |
Stephen Smalley | b68e418 | 2008-02-07 11:21:04 -0500 | [diff] [blame] | 1464 | switch (CAP_TO_INDEX(cap)) { |
| 1465 | case 0: |
| 1466 | sclass = SECCLASS_CAPABILITY; |
| 1467 | break; |
| 1468 | case 1: |
| 1469 | sclass = SECCLASS_CAPABILITY2; |
| 1470 | break; |
| 1471 | default: |
| 1472 | printk(KERN_ERR |
| 1473 | "SELinux: out of range capability %d\n", cap); |
| 1474 | BUG(); |
Eric Paris | a35c6c8 | 2011-04-20 10:21:28 -0400 | [diff] [blame] | 1475 | return -EINVAL; |
Stephen Smalley | b68e418 | 2008-02-07 11:21:04 -0500 | [diff] [blame] | 1476 | } |
Eric Paris | 0611216 | 2008-11-11 22:02:50 +1100 | [diff] [blame] | 1477 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1478 | rc = avc_has_perm_noaudit(sid, sid, sclass, av, 0, &avd); |
Eric Paris | 9ade0cf | 2011-04-25 16:26:29 -0400 | [diff] [blame] | 1479 | if (audit == SECURITY_CAP_AUDIT) { |
| 1480 | int rc2 = avc_audit(sid, sid, sclass, av, &avd, rc, &ad, 0); |
| 1481 | if (rc2) |
| 1482 | return rc2; |
| 1483 | } |
Eric Paris | 0611216 | 2008-11-11 22:02:50 +1100 | [diff] [blame] | 1484 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1485 | } |
| 1486 | |
| 1487 | /* Check whether a task is allowed to use a system operation. */ |
| 1488 | static int task_has_system(struct task_struct *tsk, |
| 1489 | u32 perms) |
| 1490 | { |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1491 | u32 sid = task_sid(tsk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1492 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1493 | return avc_has_perm(sid, SECINITSID_KERNEL, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1494 | SECCLASS_SYSTEM, perms, NULL); |
| 1495 | } |
| 1496 | |
| 1497 | /* Check whether a task has a particular permission to an inode. |
| 1498 | The 'adp' parameter is optional and allows other audit |
| 1499 | data to be passed (e.g. the dentry). */ |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 1500 | static int inode_has_perm(const struct cred *cred, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1501 | struct inode *inode, |
| 1502 | u32 perms, |
Eric Paris | 9ade0cf | 2011-04-25 16:26:29 -0400 | [diff] [blame] | 1503 | struct common_audit_data *adp, |
| 1504 | unsigned flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1505 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1506 | struct inode_security_struct *isec; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1507 | u32 sid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1508 | |
David Howells | e0e8173 | 2009-09-02 09:13:40 +0100 | [diff] [blame] | 1509 | validate_creds(cred); |
| 1510 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 1511 | if (unlikely(IS_PRIVATE(inode))) |
Stephen Smalley | bbaca6c | 2007-02-14 00:34:16 -0800 | [diff] [blame] | 1512 | return 0; |
| 1513 | |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 1514 | sid = cred_sid(cred); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1515 | isec = inode->i_security; |
| 1516 | |
Eric Paris | 9ade0cf | 2011-04-25 16:26:29 -0400 | [diff] [blame] | 1517 | return avc_has_perm_flags(sid, isec->sid, isec->sclass, perms, adp, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1518 | } |
| 1519 | |
| 1520 | /* Same as inode_has_perm, but pass explicit audit data containing |
| 1521 | the dentry to help the auditing code to more easily generate the |
| 1522 | pathname if needed. */ |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 1523 | static inline int dentry_has_perm(const struct cred *cred, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1524 | struct dentry *dentry, |
| 1525 | u32 av) |
| 1526 | { |
| 1527 | struct inode *inode = dentry->d_inode; |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 1528 | struct common_audit_data ad; |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 1529 | |
Eric Paris | 50c205f | 2012-04-04 15:01:43 -0400 | [diff] [blame] | 1530 | ad.type = LSM_AUDIT_DATA_DENTRY; |
Eric Paris | 2875fa0 | 2011-04-28 16:04:24 -0400 | [diff] [blame] | 1531 | ad.u.dentry = dentry; |
| 1532 | return inode_has_perm(cred, inode, av, &ad, 0); |
| 1533 | } |
| 1534 | |
| 1535 | /* Same as inode_has_perm, but pass explicit audit data containing |
| 1536 | the path to help the auditing code to more easily generate the |
| 1537 | pathname if needed. */ |
| 1538 | static inline int path_has_perm(const struct cred *cred, |
| 1539 | struct path *path, |
| 1540 | u32 av) |
| 1541 | { |
| 1542 | struct inode *inode = path->dentry->d_inode; |
| 1543 | struct common_audit_data ad; |
| 1544 | |
Eric Paris | 50c205f | 2012-04-04 15:01:43 -0400 | [diff] [blame] | 1545 | ad.type = LSM_AUDIT_DATA_PATH; |
Eric Paris | 2875fa0 | 2011-04-28 16:04:24 -0400 | [diff] [blame] | 1546 | ad.u.path = *path; |
Eric Paris | 9ade0cf | 2011-04-25 16:26:29 -0400 | [diff] [blame] | 1547 | return inode_has_perm(cred, inode, av, &ad, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1548 | } |
| 1549 | |
| 1550 | /* Check whether a task can use an open file descriptor to |
| 1551 | access an inode in a given way. Check access to the |
| 1552 | descriptor itself, and then use dentry_has_perm to |
| 1553 | check a particular permission to the file. |
| 1554 | Access to the descriptor is implicitly granted if it |
| 1555 | has the same SID as the process. If av is zero, then |
| 1556 | access to the file is not checked, e.g. for cases |
| 1557 | where only the descriptor is affected like seek. */ |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 1558 | static int file_has_perm(const struct cred *cred, |
| 1559 | struct file *file, |
| 1560 | u32 av) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1561 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1562 | struct file_security_struct *fsec = file->f_security; |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 1563 | struct inode *inode = file_inode(file); |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 1564 | struct common_audit_data ad; |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 1565 | u32 sid = cred_sid(cred); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1566 | int rc; |
| 1567 | |
Eric Paris | 50c205f | 2012-04-04 15:01:43 -0400 | [diff] [blame] | 1568 | ad.type = LSM_AUDIT_DATA_PATH; |
Eric Paris | f48b739 | 2011-04-25 12:54:27 -0400 | [diff] [blame] | 1569 | ad.u.path = file->f_path; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1570 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1571 | if (sid != fsec->sid) { |
| 1572 | rc = avc_has_perm(sid, fsec->sid, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1573 | SECCLASS_FD, |
| 1574 | FD__USE, |
| 1575 | &ad); |
| 1576 | if (rc) |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 1577 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1578 | } |
| 1579 | |
| 1580 | /* av is zero if only checking access to the descriptor. */ |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 1581 | rc = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1582 | if (av) |
Eric Paris | 9ade0cf | 2011-04-25 16:26:29 -0400 | [diff] [blame] | 1583 | rc = inode_has_perm(cred, inode, av, &ad, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1584 | |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 1585 | out: |
| 1586 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1587 | } |
| 1588 | |
| 1589 | /* Check whether a task can create a file. */ |
| 1590 | static int may_create(struct inode *dir, |
| 1591 | struct dentry *dentry, |
| 1592 | u16 tclass) |
| 1593 | { |
Paul Moore | 5fb4987 | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 1594 | const struct task_security_struct *tsec = current_security(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1595 | struct inode_security_struct *dsec; |
| 1596 | struct superblock_security_struct *sbsec; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1597 | u32 sid, newsid; |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 1598 | struct common_audit_data ad; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1599 | int rc; |
| 1600 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1601 | dsec = dir->i_security; |
| 1602 | sbsec = dir->i_sb->s_security; |
| 1603 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1604 | sid = tsec->sid; |
| 1605 | newsid = tsec->create_sid; |
| 1606 | |
Eric Paris | 50c205f | 2012-04-04 15:01:43 -0400 | [diff] [blame] | 1607 | ad.type = LSM_AUDIT_DATA_DENTRY; |
Eric Paris | a269434 | 2011-04-25 13:10:27 -0400 | [diff] [blame] | 1608 | ad.u.dentry = dentry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1609 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1610 | rc = avc_has_perm(sid, dsec->sid, SECCLASS_DIR, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1611 | DIR__ADD_NAME | DIR__SEARCH, |
| 1612 | &ad); |
| 1613 | if (rc) |
| 1614 | return rc; |
| 1615 | |
David P. Quigley | cd89596 | 2009-01-16 09:22:04 -0500 | [diff] [blame] | 1616 | if (!newsid || !(sbsec->flags & SE_SBLABELSUPP)) { |
Eric Paris | cb1e922 | 2011-04-28 15:11:21 -0400 | [diff] [blame] | 1617 | rc = security_transition_sid(sid, dsec->sid, tclass, |
| 1618 | &dentry->d_name, &newsid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1619 | if (rc) |
| 1620 | return rc; |
| 1621 | } |
| 1622 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1623 | rc = avc_has_perm(sid, newsid, tclass, FILE__CREATE, &ad); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1624 | if (rc) |
| 1625 | return rc; |
| 1626 | |
| 1627 | return avc_has_perm(newsid, sbsec->sid, |
| 1628 | SECCLASS_FILESYSTEM, |
| 1629 | FILESYSTEM__ASSOCIATE, &ad); |
| 1630 | } |
| 1631 | |
Michael LeMay | 4eb582c | 2006-06-26 00:24:57 -0700 | [diff] [blame] | 1632 | /* Check whether a task can create a key. */ |
| 1633 | static int may_create_key(u32 ksid, |
| 1634 | struct task_struct *ctx) |
| 1635 | { |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1636 | u32 sid = task_sid(ctx); |
Michael LeMay | 4eb582c | 2006-06-26 00:24:57 -0700 | [diff] [blame] | 1637 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1638 | return avc_has_perm(sid, ksid, SECCLASS_KEY, KEY__CREATE, NULL); |
Michael LeMay | 4eb582c | 2006-06-26 00:24:57 -0700 | [diff] [blame] | 1639 | } |
| 1640 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 1641 | #define MAY_LINK 0 |
| 1642 | #define MAY_UNLINK 1 |
| 1643 | #define MAY_RMDIR 2 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1644 | |
| 1645 | /* Check whether a task can link, unlink, or rmdir a file/directory. */ |
| 1646 | static int may_link(struct inode *dir, |
| 1647 | struct dentry *dentry, |
| 1648 | int kind) |
| 1649 | |
| 1650 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1651 | struct inode_security_struct *dsec, *isec; |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 1652 | struct common_audit_data ad; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1653 | u32 sid = current_sid(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1654 | u32 av; |
| 1655 | int rc; |
| 1656 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1657 | dsec = dir->i_security; |
| 1658 | isec = dentry->d_inode->i_security; |
| 1659 | |
Eric Paris | 50c205f | 2012-04-04 15:01:43 -0400 | [diff] [blame] | 1660 | ad.type = LSM_AUDIT_DATA_DENTRY; |
Eric Paris | a269434 | 2011-04-25 13:10:27 -0400 | [diff] [blame] | 1661 | ad.u.dentry = dentry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1662 | |
| 1663 | av = DIR__SEARCH; |
| 1664 | av |= (kind ? DIR__REMOVE_NAME : DIR__ADD_NAME); |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1665 | rc = avc_has_perm(sid, dsec->sid, SECCLASS_DIR, av, &ad); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1666 | if (rc) |
| 1667 | return rc; |
| 1668 | |
| 1669 | switch (kind) { |
| 1670 | case MAY_LINK: |
| 1671 | av = FILE__LINK; |
| 1672 | break; |
| 1673 | case MAY_UNLINK: |
| 1674 | av = FILE__UNLINK; |
| 1675 | break; |
| 1676 | case MAY_RMDIR: |
| 1677 | av = DIR__RMDIR; |
| 1678 | break; |
| 1679 | default: |
Eric Paris | 744ba35 | 2008-04-17 11:52:44 -0400 | [diff] [blame] | 1680 | printk(KERN_WARNING "SELinux: %s: unrecognized kind %d\n", |
| 1681 | __func__, kind); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1682 | return 0; |
| 1683 | } |
| 1684 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1685 | rc = avc_has_perm(sid, isec->sid, isec->sclass, av, &ad); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1686 | return rc; |
| 1687 | } |
| 1688 | |
| 1689 | static inline int may_rename(struct inode *old_dir, |
| 1690 | struct dentry *old_dentry, |
| 1691 | struct inode *new_dir, |
| 1692 | struct dentry *new_dentry) |
| 1693 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1694 | struct inode_security_struct *old_dsec, *new_dsec, *old_isec, *new_isec; |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 1695 | struct common_audit_data ad; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1696 | u32 sid = current_sid(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1697 | u32 av; |
| 1698 | int old_is_dir, new_is_dir; |
| 1699 | int rc; |
| 1700 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1701 | old_dsec = old_dir->i_security; |
| 1702 | old_isec = old_dentry->d_inode->i_security; |
| 1703 | old_is_dir = S_ISDIR(old_dentry->d_inode->i_mode); |
| 1704 | new_dsec = new_dir->i_security; |
| 1705 | |
Eric Paris | 50c205f | 2012-04-04 15:01:43 -0400 | [diff] [blame] | 1706 | ad.type = LSM_AUDIT_DATA_DENTRY; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1707 | |
Eric Paris | a269434 | 2011-04-25 13:10:27 -0400 | [diff] [blame] | 1708 | ad.u.dentry = old_dentry; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1709 | rc = avc_has_perm(sid, old_dsec->sid, SECCLASS_DIR, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1710 | DIR__REMOVE_NAME | DIR__SEARCH, &ad); |
| 1711 | if (rc) |
| 1712 | return rc; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1713 | rc = avc_has_perm(sid, old_isec->sid, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1714 | old_isec->sclass, FILE__RENAME, &ad); |
| 1715 | if (rc) |
| 1716 | return rc; |
| 1717 | if (old_is_dir && new_dir != old_dir) { |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1718 | rc = avc_has_perm(sid, old_isec->sid, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1719 | old_isec->sclass, DIR__REPARENT, &ad); |
| 1720 | if (rc) |
| 1721 | return rc; |
| 1722 | } |
| 1723 | |
Eric Paris | a269434 | 2011-04-25 13:10:27 -0400 | [diff] [blame] | 1724 | ad.u.dentry = new_dentry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1725 | av = DIR__ADD_NAME | DIR__SEARCH; |
| 1726 | if (new_dentry->d_inode) |
| 1727 | av |= DIR__REMOVE_NAME; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1728 | rc = avc_has_perm(sid, new_dsec->sid, SECCLASS_DIR, av, &ad); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1729 | if (rc) |
| 1730 | return rc; |
| 1731 | if (new_dentry->d_inode) { |
| 1732 | new_isec = new_dentry->d_inode->i_security; |
| 1733 | new_is_dir = S_ISDIR(new_dentry->d_inode->i_mode); |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1734 | rc = avc_has_perm(sid, new_isec->sid, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1735 | new_isec->sclass, |
| 1736 | (new_is_dir ? DIR__RMDIR : FILE__UNLINK), &ad); |
| 1737 | if (rc) |
| 1738 | return rc; |
| 1739 | } |
| 1740 | |
| 1741 | return 0; |
| 1742 | } |
| 1743 | |
| 1744 | /* Check whether a task can perform a filesystem operation. */ |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 1745 | static int superblock_has_perm(const struct cred *cred, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1746 | struct super_block *sb, |
| 1747 | u32 perms, |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 1748 | struct common_audit_data *ad) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1749 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1750 | struct superblock_security_struct *sbsec; |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 1751 | u32 sid = cred_sid(cred); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1752 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1753 | sbsec = sb->s_security; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1754 | return avc_has_perm(sid, sbsec->sid, SECCLASS_FILESYSTEM, perms, ad); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1755 | } |
| 1756 | |
| 1757 | /* Convert a Linux mode and permission mask to an access vector. */ |
| 1758 | static inline u32 file_mask_to_av(int mode, int mask) |
| 1759 | { |
| 1760 | u32 av = 0; |
| 1761 | |
Al Viro | dba19c6 | 2011-07-25 20:49:29 -0400 | [diff] [blame] | 1762 | if (!S_ISDIR(mode)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1763 | if (mask & MAY_EXEC) |
| 1764 | av |= FILE__EXECUTE; |
| 1765 | if (mask & MAY_READ) |
| 1766 | av |= FILE__READ; |
| 1767 | |
| 1768 | if (mask & MAY_APPEND) |
| 1769 | av |= FILE__APPEND; |
| 1770 | else if (mask & MAY_WRITE) |
| 1771 | av |= FILE__WRITE; |
| 1772 | |
| 1773 | } else { |
| 1774 | if (mask & MAY_EXEC) |
| 1775 | av |= DIR__SEARCH; |
| 1776 | if (mask & MAY_WRITE) |
| 1777 | av |= DIR__WRITE; |
| 1778 | if (mask & MAY_READ) |
| 1779 | av |= DIR__READ; |
| 1780 | } |
| 1781 | |
| 1782 | return av; |
| 1783 | } |
| 1784 | |
| 1785 | /* Convert a Linux file to an access vector. */ |
| 1786 | static inline u32 file_to_av(struct file *file) |
| 1787 | { |
| 1788 | u32 av = 0; |
| 1789 | |
| 1790 | if (file->f_mode & FMODE_READ) |
| 1791 | av |= FILE__READ; |
| 1792 | if (file->f_mode & FMODE_WRITE) { |
| 1793 | if (file->f_flags & O_APPEND) |
| 1794 | av |= FILE__APPEND; |
| 1795 | else |
| 1796 | av |= FILE__WRITE; |
| 1797 | } |
Stephen Smalley | 0794c66 | 2008-03-17 08:55:18 -0400 | [diff] [blame] | 1798 | if (!av) { |
| 1799 | /* |
| 1800 | * Special file opened with flags 3 for ioctl-only use. |
| 1801 | */ |
| 1802 | av = FILE__IOCTL; |
| 1803 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1804 | |
| 1805 | return av; |
| 1806 | } |
| 1807 | |
Eric Paris | 8b6a5a3 | 2008-10-29 17:06:46 -0400 | [diff] [blame] | 1808 | /* |
| 1809 | * Convert a file to an access vector and include the correct open |
| 1810 | * open permission. |
| 1811 | */ |
| 1812 | static inline u32 open_file_to_av(struct file *file) |
| 1813 | { |
| 1814 | u32 av = file_to_av(file); |
| 1815 | |
Eric Paris | 49b7b8d | 2010-07-23 11:44:09 -0400 | [diff] [blame] | 1816 | if (selinux_policycap_openperm) |
| 1817 | av |= FILE__OPEN; |
| 1818 | |
Eric Paris | 8b6a5a3 | 2008-10-29 17:06:46 -0400 | [diff] [blame] | 1819 | return av; |
| 1820 | } |
| 1821 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1822 | /* Hook functions begin here. */ |
| 1823 | |
Ingo Molnar | 9e48858 | 2009-05-07 19:26:19 +1000 | [diff] [blame] | 1824 | static int selinux_ptrace_access_check(struct task_struct *child, |
David Howells | 5cd9c58 | 2008-08-14 11:37:28 +0100 | [diff] [blame] | 1825 | unsigned int mode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1826 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1827 | int rc; |
| 1828 | |
Ingo Molnar | 9e48858 | 2009-05-07 19:26:19 +1000 | [diff] [blame] | 1829 | rc = cap_ptrace_access_check(child, mode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1830 | if (rc) |
| 1831 | return rc; |
| 1832 | |
Eric Paris | 69f594a | 2012-01-03 12:25:15 -0500 | [diff] [blame] | 1833 | if (mode & PTRACE_MODE_READ) { |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1834 | u32 sid = current_sid(); |
| 1835 | u32 csid = task_sid(child); |
| 1836 | return avc_has_perm(sid, csid, SECCLASS_FILE, FILE__READ, NULL); |
Stephen Smalley | 006ebb4 | 2008-05-19 08:32:49 -0400 | [diff] [blame] | 1837 | } |
| 1838 | |
David Howells | 3b11a1d | 2008-11-14 10:39:26 +1100 | [diff] [blame] | 1839 | return current_has_perm(child, PROCESS__PTRACE); |
David Howells | 5cd9c58 | 2008-08-14 11:37:28 +0100 | [diff] [blame] | 1840 | } |
| 1841 | |
| 1842 | static int selinux_ptrace_traceme(struct task_struct *parent) |
| 1843 | { |
| 1844 | int rc; |
| 1845 | |
Eric Paris | 200ac53 | 2009-02-12 15:01:04 -0500 | [diff] [blame] | 1846 | rc = cap_ptrace_traceme(parent); |
David Howells | 5cd9c58 | 2008-08-14 11:37:28 +0100 | [diff] [blame] | 1847 | if (rc) |
| 1848 | return rc; |
| 1849 | |
| 1850 | return task_has_perm(parent, current, PROCESS__PTRACE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1851 | } |
| 1852 | |
| 1853 | static int selinux_capget(struct task_struct *target, kernel_cap_t *effective, |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 1854 | kernel_cap_t *inheritable, kernel_cap_t *permitted) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1855 | { |
| 1856 | int error; |
| 1857 | |
David Howells | 3b11a1d | 2008-11-14 10:39:26 +1100 | [diff] [blame] | 1858 | error = current_has_perm(target, PROCESS__GETCAP); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1859 | if (error) |
| 1860 | return error; |
| 1861 | |
Eric Paris | 200ac53 | 2009-02-12 15:01:04 -0500 | [diff] [blame] | 1862 | return cap_capget(target, effective, inheritable, permitted); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1863 | } |
| 1864 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 1865 | static int selinux_capset(struct cred *new, const struct cred *old, |
| 1866 | const kernel_cap_t *effective, |
| 1867 | const kernel_cap_t *inheritable, |
| 1868 | const kernel_cap_t *permitted) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1869 | { |
| 1870 | int error; |
| 1871 | |
Eric Paris | 200ac53 | 2009-02-12 15:01:04 -0500 | [diff] [blame] | 1872 | error = cap_capset(new, old, |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 1873 | effective, inheritable, permitted); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1874 | if (error) |
| 1875 | return error; |
| 1876 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 1877 | return cred_has_perm(old, new, PROCESS__SETCAP); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1878 | } |
| 1879 | |
James Morris | 5626d3e | 2009-01-30 10:05:06 +1100 | [diff] [blame] | 1880 | /* |
| 1881 | * (This comment used to live with the selinux_task_setuid hook, |
| 1882 | * which was removed). |
| 1883 | * |
| 1884 | * Since setuid only affects the current process, and since the SELinux |
| 1885 | * controls are not based on the Linux identity attributes, SELinux does not |
| 1886 | * need to control this operation. However, SELinux does control the use of |
| 1887 | * the CAP_SETUID and CAP_SETGID capabilities using the capable hook. |
| 1888 | */ |
| 1889 | |
Eric Paris | 6a9de49 | 2012-01-03 12:25:14 -0500 | [diff] [blame] | 1890 | static int selinux_capable(const struct cred *cred, struct user_namespace *ns, |
| 1891 | int cap, int audit) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1892 | { |
| 1893 | int rc; |
| 1894 | |
Eric Paris | 6a9de49 | 2012-01-03 12:25:14 -0500 | [diff] [blame] | 1895 | rc = cap_capable(cred, ns, cap, audit); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1896 | if (rc) |
| 1897 | return rc; |
| 1898 | |
Eric Paris | 6a9de49 | 2012-01-03 12:25:14 -0500 | [diff] [blame] | 1899 | return cred_has_capability(cred, cap, audit); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1900 | } |
| 1901 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1902 | static int selinux_quotactl(int cmds, int type, int id, struct super_block *sb) |
| 1903 | { |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 1904 | const struct cred *cred = current_cred(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1905 | int rc = 0; |
| 1906 | |
| 1907 | if (!sb) |
| 1908 | return 0; |
| 1909 | |
| 1910 | switch (cmds) { |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 1911 | case Q_SYNC: |
| 1912 | case Q_QUOTAON: |
| 1913 | case Q_QUOTAOFF: |
| 1914 | case Q_SETINFO: |
| 1915 | case Q_SETQUOTA: |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 1916 | rc = superblock_has_perm(cred, sb, FILESYSTEM__QUOTAMOD, NULL); |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 1917 | break; |
| 1918 | case Q_GETFMT: |
| 1919 | case Q_GETINFO: |
| 1920 | case Q_GETQUOTA: |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 1921 | rc = superblock_has_perm(cred, sb, FILESYSTEM__QUOTAGET, NULL); |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 1922 | break; |
| 1923 | default: |
| 1924 | rc = 0; /* let the kernel handle invalid cmds */ |
| 1925 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1926 | } |
| 1927 | return rc; |
| 1928 | } |
| 1929 | |
| 1930 | static int selinux_quota_on(struct dentry *dentry) |
| 1931 | { |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 1932 | const struct cred *cred = current_cred(); |
| 1933 | |
Eric Paris | 2875fa0 | 2011-04-28 16:04:24 -0400 | [diff] [blame] | 1934 | return dentry_has_perm(cred, dentry, FILE__QUOTAON); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1935 | } |
| 1936 | |
Eric Paris | 12b3052 | 2010-11-15 18:36:29 -0500 | [diff] [blame] | 1937 | static int selinux_syslog(int type) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1938 | { |
| 1939 | int rc; |
| 1940 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1941 | switch (type) { |
Kees Cook | d78ca3c | 2010-02-03 15:37:13 -0800 | [diff] [blame] | 1942 | case SYSLOG_ACTION_READ_ALL: /* Read last kernel messages */ |
| 1943 | case SYSLOG_ACTION_SIZE_BUFFER: /* Return size of the log buffer */ |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 1944 | rc = task_has_system(current, SYSTEM__SYSLOG_READ); |
| 1945 | break; |
Kees Cook | d78ca3c | 2010-02-03 15:37:13 -0800 | [diff] [blame] | 1946 | case SYSLOG_ACTION_CONSOLE_OFF: /* Disable logging to console */ |
| 1947 | case SYSLOG_ACTION_CONSOLE_ON: /* Enable logging to console */ |
| 1948 | /* Set level of messages printed to console */ |
| 1949 | case SYSLOG_ACTION_CONSOLE_LEVEL: |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 1950 | rc = task_has_system(current, SYSTEM__SYSLOG_CONSOLE); |
| 1951 | break; |
Kees Cook | d78ca3c | 2010-02-03 15:37:13 -0800 | [diff] [blame] | 1952 | case SYSLOG_ACTION_CLOSE: /* Close log */ |
| 1953 | case SYSLOG_ACTION_OPEN: /* Open log */ |
| 1954 | case SYSLOG_ACTION_READ: /* Read from log */ |
| 1955 | case SYSLOG_ACTION_READ_CLEAR: /* Read/clear last kernel messages */ |
| 1956 | case SYSLOG_ACTION_CLEAR: /* Clear ring buffer */ |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 1957 | default: |
| 1958 | rc = task_has_system(current, SYSTEM__SYSLOG_MOD); |
| 1959 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1960 | } |
| 1961 | return rc; |
| 1962 | } |
| 1963 | |
| 1964 | /* |
| 1965 | * Check that a process has enough memory to allocate a new virtual |
| 1966 | * mapping. 0 means there is enough memory for the allocation to |
| 1967 | * succeed and -ENOMEM implies there is not. |
| 1968 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1969 | * Do not audit the selinux permission check, as this is applied to all |
| 1970 | * processes that allocate mappings. |
| 1971 | */ |
Alan Cox | 34b4e4a | 2007-08-22 14:01:28 -0700 | [diff] [blame] | 1972 | static int selinux_vm_enough_memory(struct mm_struct *mm, long pages) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1973 | { |
| 1974 | int rc, cap_sys_admin = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1975 | |
Eric Paris | 6a9de49 | 2012-01-03 12:25:14 -0500 | [diff] [blame] | 1976 | rc = selinux_capable(current_cred(), &init_user_ns, CAP_SYS_ADMIN, |
David Howells | 3699c53 | 2009-01-06 22:27:01 +0000 | [diff] [blame] | 1977 | SECURITY_CAP_NOAUDIT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1978 | if (rc == 0) |
| 1979 | cap_sys_admin = 1; |
| 1980 | |
Alan Cox | 34b4e4a | 2007-08-22 14:01:28 -0700 | [diff] [blame] | 1981 | return __vm_enough_memory(mm, pages, cap_sys_admin); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1982 | } |
| 1983 | |
| 1984 | /* binprm security operations */ |
| 1985 | |
David Howells | a6f76f2 | 2008-11-14 10:39:24 +1100 | [diff] [blame] | 1986 | static int selinux_bprm_set_creds(struct linux_binprm *bprm) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1987 | { |
David Howells | a6f76f2 | 2008-11-14 10:39:24 +1100 | [diff] [blame] | 1988 | const struct task_security_struct *old_tsec; |
| 1989 | struct task_security_struct *new_tsec; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1990 | struct inode_security_struct *isec; |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 1991 | struct common_audit_data ad; |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 1992 | struct inode *inode = file_inode(bprm->file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1993 | int rc; |
| 1994 | |
Eric Paris | 200ac53 | 2009-02-12 15:01:04 -0500 | [diff] [blame] | 1995 | rc = cap_bprm_set_creds(bprm); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1996 | if (rc) |
| 1997 | return rc; |
| 1998 | |
David Howells | a6f76f2 | 2008-11-14 10:39:24 +1100 | [diff] [blame] | 1999 | /* SELinux context only depends on initial program or script and not |
| 2000 | * the script interpreter */ |
| 2001 | if (bprm->cred_prepared) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2002 | return 0; |
| 2003 | |
David Howells | a6f76f2 | 2008-11-14 10:39:24 +1100 | [diff] [blame] | 2004 | old_tsec = current_security(); |
| 2005 | new_tsec = bprm->cred->security; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2006 | isec = inode->i_security; |
| 2007 | |
| 2008 | /* Default to the current task SID. */ |
David Howells | a6f76f2 | 2008-11-14 10:39:24 +1100 | [diff] [blame] | 2009 | new_tsec->sid = old_tsec->sid; |
| 2010 | new_tsec->osid = old_tsec->sid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2011 | |
Michael LeMay | 28eba5b | 2006-06-27 02:53:42 -0700 | [diff] [blame] | 2012 | /* Reset fs, key, and sock SIDs on execve. */ |
David Howells | a6f76f2 | 2008-11-14 10:39:24 +1100 | [diff] [blame] | 2013 | new_tsec->create_sid = 0; |
| 2014 | new_tsec->keycreate_sid = 0; |
| 2015 | new_tsec->sockcreate_sid = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2016 | |
David Howells | a6f76f2 | 2008-11-14 10:39:24 +1100 | [diff] [blame] | 2017 | if (old_tsec->exec_sid) { |
| 2018 | new_tsec->sid = old_tsec->exec_sid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2019 | /* Reset exec SID on execve. */ |
David Howells | a6f76f2 | 2008-11-14 10:39:24 +1100 | [diff] [blame] | 2020 | new_tsec->exec_sid = 0; |
Andy Lutomirski | 259e5e6 | 2012-04-12 16:47:50 -0500 | [diff] [blame] | 2021 | |
| 2022 | /* |
| 2023 | * Minimize confusion: if no_new_privs and a transition is |
| 2024 | * explicitly requested, then fail the exec. |
| 2025 | */ |
| 2026 | if (bprm->unsafe & LSM_UNSAFE_NO_NEW_PRIVS) |
| 2027 | return -EPERM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2028 | } else { |
| 2029 | /* Check for a default transition on this program. */ |
David Howells | a6f76f2 | 2008-11-14 10:39:24 +1100 | [diff] [blame] | 2030 | rc = security_transition_sid(old_tsec->sid, isec->sid, |
Eric Paris | 652bb9b | 2011-02-01 11:05:40 -0500 | [diff] [blame] | 2031 | SECCLASS_PROCESS, NULL, |
| 2032 | &new_tsec->sid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2033 | if (rc) |
| 2034 | return rc; |
| 2035 | } |
| 2036 | |
Eric Paris | 50c205f | 2012-04-04 15:01:43 -0400 | [diff] [blame] | 2037 | ad.type = LSM_AUDIT_DATA_PATH; |
Eric Paris | f48b739 | 2011-04-25 12:54:27 -0400 | [diff] [blame] | 2038 | ad.u.path = bprm->file->f_path; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2039 | |
Andy Lutomirski | 259e5e6 | 2012-04-12 16:47:50 -0500 | [diff] [blame] | 2040 | if ((bprm->file->f_path.mnt->mnt_flags & MNT_NOSUID) || |
| 2041 | (bprm->unsafe & LSM_UNSAFE_NO_NEW_PRIVS)) |
David Howells | a6f76f2 | 2008-11-14 10:39:24 +1100 | [diff] [blame] | 2042 | new_tsec->sid = old_tsec->sid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2043 | |
David Howells | a6f76f2 | 2008-11-14 10:39:24 +1100 | [diff] [blame] | 2044 | if (new_tsec->sid == old_tsec->sid) { |
| 2045 | rc = avc_has_perm(old_tsec->sid, isec->sid, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2046 | SECCLASS_FILE, FILE__EXECUTE_NO_TRANS, &ad); |
| 2047 | if (rc) |
| 2048 | return rc; |
| 2049 | } else { |
| 2050 | /* Check permissions for the transition. */ |
David Howells | a6f76f2 | 2008-11-14 10:39:24 +1100 | [diff] [blame] | 2051 | rc = avc_has_perm(old_tsec->sid, new_tsec->sid, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2052 | SECCLASS_PROCESS, PROCESS__TRANSITION, &ad); |
| 2053 | if (rc) |
| 2054 | return rc; |
| 2055 | |
David Howells | a6f76f2 | 2008-11-14 10:39:24 +1100 | [diff] [blame] | 2056 | rc = avc_has_perm(new_tsec->sid, isec->sid, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2057 | SECCLASS_FILE, FILE__ENTRYPOINT, &ad); |
| 2058 | if (rc) |
| 2059 | return rc; |
| 2060 | |
David Howells | a6f76f2 | 2008-11-14 10:39:24 +1100 | [diff] [blame] | 2061 | /* Check for shared state */ |
| 2062 | if (bprm->unsafe & LSM_UNSAFE_SHARE) { |
| 2063 | rc = avc_has_perm(old_tsec->sid, new_tsec->sid, |
| 2064 | SECCLASS_PROCESS, PROCESS__SHARE, |
| 2065 | NULL); |
| 2066 | if (rc) |
| 2067 | return -EPERM; |
| 2068 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2069 | |
David Howells | a6f76f2 | 2008-11-14 10:39:24 +1100 | [diff] [blame] | 2070 | /* Make sure that anyone attempting to ptrace over a task that |
| 2071 | * changes its SID has the appropriate permit */ |
| 2072 | if (bprm->unsafe & |
| 2073 | (LSM_UNSAFE_PTRACE | LSM_UNSAFE_PTRACE_CAP)) { |
| 2074 | struct task_struct *tracer; |
| 2075 | struct task_security_struct *sec; |
| 2076 | u32 ptsid = 0; |
| 2077 | |
| 2078 | rcu_read_lock(); |
Tejun Heo | 06d9847 | 2011-06-17 16:50:40 +0200 | [diff] [blame] | 2079 | tracer = ptrace_parent(current); |
David Howells | a6f76f2 | 2008-11-14 10:39:24 +1100 | [diff] [blame] | 2080 | if (likely(tracer != NULL)) { |
| 2081 | sec = __task_cred(tracer)->security; |
| 2082 | ptsid = sec->sid; |
| 2083 | } |
| 2084 | rcu_read_unlock(); |
| 2085 | |
| 2086 | if (ptsid != 0) { |
| 2087 | rc = avc_has_perm(ptsid, new_tsec->sid, |
| 2088 | SECCLASS_PROCESS, |
| 2089 | PROCESS__PTRACE, NULL); |
| 2090 | if (rc) |
| 2091 | return -EPERM; |
| 2092 | } |
| 2093 | } |
| 2094 | |
| 2095 | /* Clear any possibly unsafe personality bits on exec: */ |
| 2096 | bprm->per_clear |= PER_CLEAR_ON_SETID; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2097 | } |
| 2098 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2099 | return 0; |
| 2100 | } |
| 2101 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 2102 | static int selinux_bprm_secureexec(struct linux_binprm *bprm) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2103 | { |
Paul Moore | 5fb4987 | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 2104 | const struct task_security_struct *tsec = current_security(); |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 2105 | u32 sid, osid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2106 | int atsecure = 0; |
| 2107 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 2108 | sid = tsec->sid; |
| 2109 | osid = tsec->osid; |
| 2110 | |
| 2111 | if (osid != sid) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2112 | /* Enable secure mode for SIDs transitions unless |
| 2113 | the noatsecure permission is granted between |
| 2114 | the two SIDs, i.e. ahp returns 0. */ |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 2115 | atsecure = avc_has_perm(osid, sid, |
David Howells | a6f76f2 | 2008-11-14 10:39:24 +1100 | [diff] [blame] | 2116 | SECCLASS_PROCESS, |
| 2117 | PROCESS__NOATSECURE, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2118 | } |
| 2119 | |
Eric Paris | 200ac53 | 2009-02-12 15:01:04 -0500 | [diff] [blame] | 2120 | return (atsecure || cap_bprm_secureexec(bprm)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2121 | } |
| 2122 | |
Al Viro | c3c073f | 2012-08-21 22:32:06 -0400 | [diff] [blame] | 2123 | static int match_file(const void *p, struct file *file, unsigned fd) |
| 2124 | { |
| 2125 | return file_has_perm(p, file, file_to_av(file)) ? fd + 1 : 0; |
| 2126 | } |
| 2127 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2128 | /* Derived from fs/exec.c:flush_old_files. */ |
David Howells | 745ca24 | 2008-11-14 10:39:22 +1100 | [diff] [blame] | 2129 | static inline void flush_unauthorized_files(const struct cred *cred, |
| 2130 | struct files_struct *files) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2131 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2132 | struct file *file, *devnull = NULL; |
Stephen Smalley | b20c812 | 2006-09-25 23:32:03 -0700 | [diff] [blame] | 2133 | struct tty_struct *tty; |
Peter Zijlstra | 24ec839 | 2006-12-08 02:36:04 -0800 | [diff] [blame] | 2134 | int drop_tty = 0; |
Al Viro | c3c073f | 2012-08-21 22:32:06 -0400 | [diff] [blame] | 2135 | unsigned n; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2136 | |
Peter Zijlstra | 24ec839 | 2006-12-08 02:36:04 -0800 | [diff] [blame] | 2137 | tty = get_current_tty(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2138 | if (tty) { |
Nick Piggin | ee2ffa0 | 2010-08-18 04:37:35 +1000 | [diff] [blame] | 2139 | spin_lock(&tty_files_lock); |
Eric Paris | 37dd0bd | 2008-10-31 17:40:00 -0400 | [diff] [blame] | 2140 | if (!list_empty(&tty->tty_files)) { |
Nick Piggin | d996b62 | 2010-08-18 04:37:36 +1000 | [diff] [blame] | 2141 | struct tty_file_private *file_priv; |
Eric Paris | 37dd0bd | 2008-10-31 17:40:00 -0400 | [diff] [blame] | 2142 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2143 | /* Revalidate access to controlling tty. |
Eric Paris | 602a8dd | 2012-04-04 15:01:42 -0400 | [diff] [blame] | 2144 | Use path_has_perm on the tty path directly rather |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2145 | than using file_has_perm, as this particular open |
| 2146 | file may belong to another process and we are only |
| 2147 | interested in the inode-based check here. */ |
Nick Piggin | d996b62 | 2010-08-18 04:37:36 +1000 | [diff] [blame] | 2148 | file_priv = list_first_entry(&tty->tty_files, |
| 2149 | struct tty_file_private, list); |
| 2150 | file = file_priv->file; |
Eric Paris | 602a8dd | 2012-04-04 15:01:42 -0400 | [diff] [blame] | 2151 | if (path_has_perm(cred, &file->f_path, FILE__READ | FILE__WRITE)) |
Peter Zijlstra | 24ec839 | 2006-12-08 02:36:04 -0800 | [diff] [blame] | 2152 | drop_tty = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2153 | } |
Nick Piggin | ee2ffa0 | 2010-08-18 04:37:35 +1000 | [diff] [blame] | 2154 | spin_unlock(&tty_files_lock); |
Alan Cox | 452a00d | 2008-10-13 10:39:13 +0100 | [diff] [blame] | 2155 | tty_kref_put(tty); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2156 | } |
Eric W. Biederman | 98a27ba | 2007-05-08 00:26:56 -0700 | [diff] [blame] | 2157 | /* Reset controlling tty. */ |
| 2158 | if (drop_tty) |
| 2159 | no_tty(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2160 | |
| 2161 | /* Revalidate access to inherited open files. */ |
Al Viro | c3c073f | 2012-08-21 22:32:06 -0400 | [diff] [blame] | 2162 | n = iterate_fd(files, 0, match_file, cred); |
| 2163 | if (!n) /* none found? */ |
| 2164 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2165 | |
Al Viro | c3c073f | 2012-08-21 22:32:06 -0400 | [diff] [blame] | 2166 | devnull = dentry_open(&selinux_null, O_RDWR, cred); |
Al Viro | 45525b2 | 2012-10-16 13:30:07 -0400 | [diff] [blame] | 2167 | if (IS_ERR(devnull)) |
| 2168 | devnull = NULL; |
| 2169 | /* replace all the matching ones with this */ |
| 2170 | do { |
| 2171 | replace_fd(n - 1, devnull, 0); |
| 2172 | } while ((n = iterate_fd(files, n, match_file, cred)) != 0); |
| 2173 | if (devnull) |
Al Viro | c3c073f | 2012-08-21 22:32:06 -0400 | [diff] [blame] | 2174 | fput(devnull); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2175 | } |
| 2176 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2177 | /* |
David Howells | a6f76f2 | 2008-11-14 10:39:24 +1100 | [diff] [blame] | 2178 | * Prepare a process for imminent new credential changes due to exec |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2179 | */ |
David Howells | a6f76f2 | 2008-11-14 10:39:24 +1100 | [diff] [blame] | 2180 | static void selinux_bprm_committing_creds(struct linux_binprm *bprm) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2181 | { |
David Howells | a6f76f2 | 2008-11-14 10:39:24 +1100 | [diff] [blame] | 2182 | struct task_security_struct *new_tsec; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2183 | struct rlimit *rlim, *initrlim; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2184 | int rc, i; |
| 2185 | |
David Howells | a6f76f2 | 2008-11-14 10:39:24 +1100 | [diff] [blame] | 2186 | new_tsec = bprm->cred->security; |
| 2187 | if (new_tsec->sid == new_tsec->osid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2188 | return; |
| 2189 | |
| 2190 | /* Close files for which the new task SID is not authorized. */ |
David Howells | a6f76f2 | 2008-11-14 10:39:24 +1100 | [diff] [blame] | 2191 | flush_unauthorized_files(bprm->cred, current->files); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2192 | |
David Howells | a6f76f2 | 2008-11-14 10:39:24 +1100 | [diff] [blame] | 2193 | /* Always clear parent death signal on SID transitions. */ |
| 2194 | current->pdeath_signal = 0; |
| 2195 | |
| 2196 | /* Check whether the new SID can inherit resource limits from the old |
| 2197 | * SID. If not, reset all soft limits to the lower of the current |
| 2198 | * task's hard limit and the init task's soft limit. |
| 2199 | * |
| 2200 | * Note that the setting of hard limits (even to lower them) can be |
| 2201 | * controlled by the setrlimit check. The inclusion of the init task's |
| 2202 | * soft limit into the computation is to avoid resetting soft limits |
| 2203 | * higher than the default soft limit for cases where the default is |
| 2204 | * lower than the hard limit, e.g. RLIMIT_CORE or RLIMIT_STACK. |
| 2205 | */ |
| 2206 | rc = avc_has_perm(new_tsec->osid, new_tsec->sid, SECCLASS_PROCESS, |
| 2207 | PROCESS__RLIMITINH, NULL); |
| 2208 | if (rc) { |
Oleg Nesterov | eb2d55a | 2010-06-23 22:43:32 +0200 | [diff] [blame] | 2209 | /* protect against do_prlimit() */ |
| 2210 | task_lock(current); |
David Howells | a6f76f2 | 2008-11-14 10:39:24 +1100 | [diff] [blame] | 2211 | for (i = 0; i < RLIM_NLIMITS; i++) { |
| 2212 | rlim = current->signal->rlim + i; |
| 2213 | initrlim = init_task.signal->rlim + i; |
| 2214 | rlim->rlim_cur = min(rlim->rlim_max, initrlim->rlim_cur); |
| 2215 | } |
Oleg Nesterov | eb2d55a | 2010-06-23 22:43:32 +0200 | [diff] [blame] | 2216 | task_unlock(current); |
| 2217 | update_rlimit_cpu(current, rlimit(RLIMIT_CPU)); |
David Howells | a6f76f2 | 2008-11-14 10:39:24 +1100 | [diff] [blame] | 2218 | } |
| 2219 | } |
| 2220 | |
| 2221 | /* |
| 2222 | * Clean up the process immediately after the installation of new credentials |
| 2223 | * due to exec |
| 2224 | */ |
| 2225 | static void selinux_bprm_committed_creds(struct linux_binprm *bprm) |
| 2226 | { |
| 2227 | const struct task_security_struct *tsec = current_security(); |
| 2228 | struct itimerval itimer; |
David Howells | a6f76f2 | 2008-11-14 10:39:24 +1100 | [diff] [blame] | 2229 | u32 osid, sid; |
| 2230 | int rc, i; |
David Howells | a6f76f2 | 2008-11-14 10:39:24 +1100 | [diff] [blame] | 2231 | |
David Howells | a6f76f2 | 2008-11-14 10:39:24 +1100 | [diff] [blame] | 2232 | osid = tsec->osid; |
| 2233 | sid = tsec->sid; |
| 2234 | |
| 2235 | if (sid == osid) |
| 2236 | return; |
| 2237 | |
| 2238 | /* Check whether the new SID can inherit signal state from the old SID. |
| 2239 | * If not, clear itimers to avoid subsequent signal generation and |
| 2240 | * flush and unblock signals. |
| 2241 | * |
| 2242 | * This must occur _after_ the task SID has been updated so that any |
| 2243 | * kill done after the flush will be checked against the new SID. |
| 2244 | */ |
| 2245 | rc = avc_has_perm(osid, sid, SECCLASS_PROCESS, PROCESS__SIGINH, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2246 | if (rc) { |
| 2247 | memset(&itimer, 0, sizeof itimer); |
| 2248 | for (i = 0; i < 3; i++) |
| 2249 | do_setitimer(i, &itimer, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2250 | spin_lock_irq(¤t->sighand->siglock); |
David Howells | 3bcac02 | 2009-04-29 13:45:05 +0100 | [diff] [blame] | 2251 | if (!(current->signal->flags & SIGNAL_GROUP_EXIT)) { |
| 2252 | __flush_signals(current); |
| 2253 | flush_signal_handlers(current, 1); |
| 2254 | sigemptyset(¤t->blocked); |
| 2255 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2256 | spin_unlock_irq(¤t->sighand->siglock); |
| 2257 | } |
| 2258 | |
David Howells | a6f76f2 | 2008-11-14 10:39:24 +1100 | [diff] [blame] | 2259 | /* Wake up the parent if it is waiting so that it can recheck |
| 2260 | * wait permission to the new task SID. */ |
Oleg Nesterov | ecd6de3 | 2009-04-29 16:02:24 +0200 | [diff] [blame] | 2261 | read_lock(&tasklist_lock); |
Oleg Nesterov | 0b7570e | 2009-09-23 15:56:46 -0700 | [diff] [blame] | 2262 | __wake_up_parent(current, current->real_parent); |
Oleg Nesterov | ecd6de3 | 2009-04-29 16:02:24 +0200 | [diff] [blame] | 2263 | read_unlock(&tasklist_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2264 | } |
| 2265 | |
| 2266 | /* superblock security operations */ |
| 2267 | |
| 2268 | static int selinux_sb_alloc_security(struct super_block *sb) |
| 2269 | { |
| 2270 | return superblock_alloc_security(sb); |
| 2271 | } |
| 2272 | |
| 2273 | static void selinux_sb_free_security(struct super_block *sb) |
| 2274 | { |
| 2275 | superblock_free_security(sb); |
| 2276 | } |
| 2277 | |
| 2278 | static inline int match_prefix(char *prefix, int plen, char *option, int olen) |
| 2279 | { |
| 2280 | if (plen > olen) |
| 2281 | return 0; |
| 2282 | |
| 2283 | return !memcmp(prefix, option, plen); |
| 2284 | } |
| 2285 | |
| 2286 | static inline int selinux_option(char *option, int len) |
| 2287 | { |
Eric Paris | 832cbd9 | 2008-04-01 13:24:09 -0400 | [diff] [blame] | 2288 | return (match_prefix(CONTEXT_STR, sizeof(CONTEXT_STR)-1, option, len) || |
| 2289 | match_prefix(FSCONTEXT_STR, sizeof(FSCONTEXT_STR)-1, option, len) || |
| 2290 | match_prefix(DEFCONTEXT_STR, sizeof(DEFCONTEXT_STR)-1, option, len) || |
David P. Quigley | 11689d4 | 2009-01-16 09:22:03 -0500 | [diff] [blame] | 2291 | match_prefix(ROOTCONTEXT_STR, sizeof(ROOTCONTEXT_STR)-1, option, len) || |
| 2292 | match_prefix(LABELSUPP_STR, sizeof(LABELSUPP_STR)-1, option, len)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2293 | } |
| 2294 | |
| 2295 | static inline void take_option(char **to, char *from, int *first, int len) |
| 2296 | { |
| 2297 | if (!*first) { |
| 2298 | **to = ','; |
| 2299 | *to += 1; |
Cory Olmo | 3528a95 | 2006-09-29 01:58:44 -0700 | [diff] [blame] | 2300 | } else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2301 | *first = 0; |
| 2302 | memcpy(*to, from, len); |
| 2303 | *to += len; |
| 2304 | } |
| 2305 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 2306 | static inline void take_selinux_option(char **to, char *from, int *first, |
| 2307 | int len) |
Cory Olmo | 3528a95 | 2006-09-29 01:58:44 -0700 | [diff] [blame] | 2308 | { |
| 2309 | int current_size = 0; |
| 2310 | |
| 2311 | if (!*first) { |
| 2312 | **to = '|'; |
| 2313 | *to += 1; |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 2314 | } else |
Cory Olmo | 3528a95 | 2006-09-29 01:58:44 -0700 | [diff] [blame] | 2315 | *first = 0; |
| 2316 | |
| 2317 | while (current_size < len) { |
| 2318 | if (*from != '"') { |
| 2319 | **to = *from; |
| 2320 | *to += 1; |
| 2321 | } |
| 2322 | from += 1; |
| 2323 | current_size += 1; |
| 2324 | } |
| 2325 | } |
| 2326 | |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 2327 | static int selinux_sb_copy_data(char *orig, char *copy) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2328 | { |
| 2329 | int fnosec, fsec, rc = 0; |
| 2330 | char *in_save, *in_curr, *in_end; |
| 2331 | char *sec_curr, *nosec_save, *nosec; |
Cory Olmo | 3528a95 | 2006-09-29 01:58:44 -0700 | [diff] [blame] | 2332 | int open_quote = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2333 | |
| 2334 | in_curr = orig; |
| 2335 | sec_curr = copy; |
| 2336 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2337 | nosec = (char *)get_zeroed_page(GFP_KERNEL); |
| 2338 | if (!nosec) { |
| 2339 | rc = -ENOMEM; |
| 2340 | goto out; |
| 2341 | } |
| 2342 | |
| 2343 | nosec_save = nosec; |
| 2344 | fnosec = fsec = 1; |
| 2345 | in_save = in_end = orig; |
| 2346 | |
| 2347 | do { |
Cory Olmo | 3528a95 | 2006-09-29 01:58:44 -0700 | [diff] [blame] | 2348 | if (*in_end == '"') |
| 2349 | open_quote = !open_quote; |
| 2350 | if ((*in_end == ',' && open_quote == 0) || |
| 2351 | *in_end == '\0') { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2352 | int len = in_end - in_curr; |
| 2353 | |
| 2354 | if (selinux_option(in_curr, len)) |
Cory Olmo | 3528a95 | 2006-09-29 01:58:44 -0700 | [diff] [blame] | 2355 | take_selinux_option(&sec_curr, in_curr, &fsec, len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2356 | else |
| 2357 | take_option(&nosec, in_curr, &fnosec, len); |
| 2358 | |
| 2359 | in_curr = in_end + 1; |
| 2360 | } |
| 2361 | } while (*in_end++); |
| 2362 | |
Eric Paris | 6931dfc | 2005-06-30 02:58:51 -0700 | [diff] [blame] | 2363 | strcpy(in_save, nosec_save); |
Gerald Schaefer | da3caa2 | 2005-06-21 17:15:18 -0700 | [diff] [blame] | 2364 | free_page((unsigned long)nosec_save); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2365 | out: |
| 2366 | return rc; |
| 2367 | } |
| 2368 | |
Eric Paris | 026eb16 | 2011-03-03 16:09:14 -0500 | [diff] [blame] | 2369 | static int selinux_sb_remount(struct super_block *sb, void *data) |
| 2370 | { |
| 2371 | int rc, i, *flags; |
| 2372 | struct security_mnt_opts opts; |
| 2373 | char *secdata, **mount_options; |
| 2374 | struct superblock_security_struct *sbsec = sb->s_security; |
| 2375 | |
| 2376 | if (!(sbsec->flags & SE_SBINITIALIZED)) |
| 2377 | return 0; |
| 2378 | |
| 2379 | if (!data) |
| 2380 | return 0; |
| 2381 | |
| 2382 | if (sb->s_type->fs_flags & FS_BINARY_MOUNTDATA) |
| 2383 | return 0; |
| 2384 | |
| 2385 | security_init_mnt_opts(&opts); |
| 2386 | secdata = alloc_secdata(); |
| 2387 | if (!secdata) |
| 2388 | return -ENOMEM; |
| 2389 | rc = selinux_sb_copy_data(data, secdata); |
| 2390 | if (rc) |
| 2391 | goto out_free_secdata; |
| 2392 | |
| 2393 | rc = selinux_parse_opts_str(secdata, &opts); |
| 2394 | if (rc) |
| 2395 | goto out_free_secdata; |
| 2396 | |
| 2397 | mount_options = opts.mnt_opts; |
| 2398 | flags = opts.mnt_opts_flags; |
| 2399 | |
| 2400 | for (i = 0; i < opts.num_mnt_opts; i++) { |
| 2401 | u32 sid; |
| 2402 | size_t len; |
| 2403 | |
| 2404 | if (flags[i] == SE_SBLABELSUPP) |
| 2405 | continue; |
| 2406 | len = strlen(mount_options[i]); |
| 2407 | rc = security_context_to_sid(mount_options[i], len, &sid); |
| 2408 | if (rc) { |
| 2409 | printk(KERN_WARNING "SELinux: security_context_to_sid" |
| 2410 | "(%s) failed for (dev %s, type %s) errno=%d\n", |
| 2411 | mount_options[i], sb->s_id, sb->s_type->name, rc); |
| 2412 | goto out_free_opts; |
| 2413 | } |
| 2414 | rc = -EINVAL; |
| 2415 | switch (flags[i]) { |
| 2416 | case FSCONTEXT_MNT: |
| 2417 | if (bad_option(sbsec, FSCONTEXT_MNT, sbsec->sid, sid)) |
| 2418 | goto out_bad_option; |
| 2419 | break; |
| 2420 | case CONTEXT_MNT: |
| 2421 | if (bad_option(sbsec, CONTEXT_MNT, sbsec->mntpoint_sid, sid)) |
| 2422 | goto out_bad_option; |
| 2423 | break; |
| 2424 | case ROOTCONTEXT_MNT: { |
| 2425 | struct inode_security_struct *root_isec; |
| 2426 | root_isec = sb->s_root->d_inode->i_security; |
| 2427 | |
| 2428 | if (bad_option(sbsec, ROOTCONTEXT_MNT, root_isec->sid, sid)) |
| 2429 | goto out_bad_option; |
| 2430 | break; |
| 2431 | } |
| 2432 | case DEFCONTEXT_MNT: |
| 2433 | if (bad_option(sbsec, DEFCONTEXT_MNT, sbsec->def_sid, sid)) |
| 2434 | goto out_bad_option; |
| 2435 | break; |
| 2436 | default: |
| 2437 | goto out_free_opts; |
| 2438 | } |
| 2439 | } |
| 2440 | |
| 2441 | rc = 0; |
| 2442 | out_free_opts: |
| 2443 | security_free_mnt_opts(&opts); |
| 2444 | out_free_secdata: |
| 2445 | free_secdata(secdata); |
| 2446 | return rc; |
| 2447 | out_bad_option: |
| 2448 | printk(KERN_WARNING "SELinux: unable to change security options " |
| 2449 | "during remount (dev %s, type=%s)\n", sb->s_id, |
| 2450 | sb->s_type->name); |
| 2451 | goto out_free_opts; |
| 2452 | } |
| 2453 | |
James Morris | 12204e2 | 2008-12-19 10:44:42 +1100 | [diff] [blame] | 2454 | 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] | 2455 | { |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 2456 | const struct cred *cred = current_cred(); |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 2457 | struct common_audit_data ad; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2458 | int rc; |
| 2459 | |
| 2460 | rc = superblock_doinit(sb, data); |
| 2461 | if (rc) |
| 2462 | return rc; |
| 2463 | |
James Morris | 7419224 | 2008-12-19 11:41:10 +1100 | [diff] [blame] | 2464 | /* Allow all mounts performed by the kernel */ |
| 2465 | if (flags & MS_KERNMOUNT) |
| 2466 | return 0; |
| 2467 | |
Eric Paris | 50c205f | 2012-04-04 15:01:43 -0400 | [diff] [blame] | 2468 | ad.type = LSM_AUDIT_DATA_DENTRY; |
Eric Paris | a269434 | 2011-04-25 13:10:27 -0400 | [diff] [blame] | 2469 | ad.u.dentry = sb->s_root; |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 2470 | return superblock_has_perm(cred, sb, FILESYSTEM__MOUNT, &ad); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2471 | } |
| 2472 | |
David Howells | 726c334 | 2006-06-23 02:02:58 -0700 | [diff] [blame] | 2473 | static int selinux_sb_statfs(struct dentry *dentry) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2474 | { |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 2475 | const struct cred *cred = current_cred(); |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 2476 | struct common_audit_data ad; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2477 | |
Eric Paris | 50c205f | 2012-04-04 15:01:43 -0400 | [diff] [blame] | 2478 | ad.type = LSM_AUDIT_DATA_DENTRY; |
Eric Paris | a269434 | 2011-04-25 13:10:27 -0400 | [diff] [blame] | 2479 | ad.u.dentry = dentry->d_sb->s_root; |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 2480 | return superblock_has_perm(cred, dentry->d_sb, FILESYSTEM__GETATTR, &ad); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2481 | } |
| 2482 | |
Al Viro | 808d4e3 | 2012-10-11 11:42:01 -0400 | [diff] [blame] | 2483 | static int selinux_mount(const char *dev_name, |
Al Viro | b5266eb | 2008-03-22 17:48:24 -0400 | [diff] [blame] | 2484 | struct path *path, |
Al Viro | 808d4e3 | 2012-10-11 11:42:01 -0400 | [diff] [blame] | 2485 | const char *type, |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 2486 | unsigned long flags, |
| 2487 | void *data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2488 | { |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 2489 | const struct cred *cred = current_cred(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2490 | |
| 2491 | if (flags & MS_REMOUNT) |
Al Viro | d8c9584 | 2011-12-07 18:16:57 -0500 | [diff] [blame] | 2492 | return superblock_has_perm(cred, path->dentry->d_sb, |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 2493 | FILESYSTEM__REMOUNT, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2494 | else |
Eric Paris | 2875fa0 | 2011-04-28 16:04:24 -0400 | [diff] [blame] | 2495 | return path_has_perm(cred, path, FILE__MOUNTON); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2496 | } |
| 2497 | |
| 2498 | static int selinux_umount(struct vfsmount *mnt, int flags) |
| 2499 | { |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 2500 | const struct cred *cred = current_cred(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2501 | |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 2502 | return superblock_has_perm(cred, mnt->mnt_sb, |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 2503 | FILESYSTEM__UNMOUNT, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2504 | } |
| 2505 | |
| 2506 | /* inode security operations */ |
| 2507 | |
| 2508 | static int selinux_inode_alloc_security(struct inode *inode) |
| 2509 | { |
| 2510 | return inode_alloc_security(inode); |
| 2511 | } |
| 2512 | |
| 2513 | static void selinux_inode_free_security(struct inode *inode) |
| 2514 | { |
| 2515 | inode_free_security(inode); |
| 2516 | } |
| 2517 | |
Stephen Smalley | 5e41ff9 | 2005-09-09 13:01:35 -0700 | [diff] [blame] | 2518 | static int selinux_inode_init_security(struct inode *inode, struct inode *dir, |
Eric Paris | 2a7dba3 | 2011-02-01 11:05:39 -0500 | [diff] [blame] | 2519 | const struct qstr *qstr, char **name, |
| 2520 | void **value, size_t *len) |
Stephen Smalley | 5e41ff9 | 2005-09-09 13:01:35 -0700 | [diff] [blame] | 2521 | { |
Paul Moore | 5fb4987 | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 2522 | const struct task_security_struct *tsec = current_security(); |
Stephen Smalley | 5e41ff9 | 2005-09-09 13:01:35 -0700 | [diff] [blame] | 2523 | struct inode_security_struct *dsec; |
| 2524 | struct superblock_security_struct *sbsec; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 2525 | u32 sid, newsid, clen; |
Stephen Smalley | 5e41ff9 | 2005-09-09 13:01:35 -0700 | [diff] [blame] | 2526 | int rc; |
Stephen Smalley | 570bc1c | 2005-09-09 13:01:43 -0700 | [diff] [blame] | 2527 | char *namep = NULL, *context; |
Stephen Smalley | 5e41ff9 | 2005-09-09 13:01:35 -0700 | [diff] [blame] | 2528 | |
Stephen Smalley | 5e41ff9 | 2005-09-09 13:01:35 -0700 | [diff] [blame] | 2529 | dsec = dir->i_security; |
| 2530 | sbsec = dir->i_sb->s_security; |
Stephen Smalley | 5e41ff9 | 2005-09-09 13:01:35 -0700 | [diff] [blame] | 2531 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 2532 | sid = tsec->sid; |
| 2533 | newsid = tsec->create_sid; |
| 2534 | |
Eric Paris | 415103f | 2010-12-02 16:13:40 -0500 | [diff] [blame] | 2535 | if ((sbsec->flags & SE_SBINITIALIZED) && |
| 2536 | (sbsec->behavior == SECURITY_FS_USE_MNTPOINT)) |
| 2537 | newsid = sbsec->mntpoint_sid; |
| 2538 | else if (!newsid || !(sbsec->flags & SE_SBLABELSUPP)) { |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 2539 | rc = security_transition_sid(sid, dsec->sid, |
Stephen Smalley | 5e41ff9 | 2005-09-09 13:01:35 -0700 | [diff] [blame] | 2540 | inode_mode_to_security_class(inode->i_mode), |
Eric Paris | 652bb9b | 2011-02-01 11:05:40 -0500 | [diff] [blame] | 2541 | qstr, &newsid); |
Stephen Smalley | 5e41ff9 | 2005-09-09 13:01:35 -0700 | [diff] [blame] | 2542 | if (rc) { |
| 2543 | printk(KERN_WARNING "%s: " |
| 2544 | "security_transition_sid failed, rc=%d (dev=%s " |
| 2545 | "ino=%ld)\n", |
Harvey Harrison | dd6f953 | 2008-03-06 10:03:59 +1100 | [diff] [blame] | 2546 | __func__, |
Stephen Smalley | 5e41ff9 | 2005-09-09 13:01:35 -0700 | [diff] [blame] | 2547 | -rc, inode->i_sb->s_id, inode->i_ino); |
| 2548 | return rc; |
| 2549 | } |
| 2550 | } |
| 2551 | |
Eric Paris | 296fddf | 2006-09-25 23:32:00 -0700 | [diff] [blame] | 2552 | /* Possibly defer initialization to selinux_complete_init. */ |
David P. Quigley | 0d90a7e | 2009-01-16 09:22:02 -0500 | [diff] [blame] | 2553 | if (sbsec->flags & SE_SBINITIALIZED) { |
Eric Paris | 296fddf | 2006-09-25 23:32:00 -0700 | [diff] [blame] | 2554 | struct inode_security_struct *isec = inode->i_security; |
| 2555 | isec->sclass = inode_mode_to_security_class(inode->i_mode); |
| 2556 | isec->sid = newsid; |
| 2557 | isec->initialized = 1; |
| 2558 | } |
Stephen Smalley | 5e41ff9 | 2005-09-09 13:01:35 -0700 | [diff] [blame] | 2559 | |
David P. Quigley | cd89596 | 2009-01-16 09:22:04 -0500 | [diff] [blame] | 2560 | if (!ss_initialized || !(sbsec->flags & SE_SBLABELSUPP)) |
Stephen Smalley | 25a74f3 | 2005-11-08 21:34:33 -0800 | [diff] [blame] | 2561 | return -EOPNOTSUPP; |
| 2562 | |
Stephen Smalley | 570bc1c | 2005-09-09 13:01:43 -0700 | [diff] [blame] | 2563 | if (name) { |
Josef Bacik | a02fe13 | 2008-04-04 09:35:05 +1100 | [diff] [blame] | 2564 | namep = kstrdup(XATTR_SELINUX_SUFFIX, GFP_NOFS); |
Stephen Smalley | 570bc1c | 2005-09-09 13:01:43 -0700 | [diff] [blame] | 2565 | if (!namep) |
| 2566 | return -ENOMEM; |
| 2567 | *name = namep; |
Stephen Smalley | 5e41ff9 | 2005-09-09 13:01:35 -0700 | [diff] [blame] | 2568 | } |
Stephen Smalley | 570bc1c | 2005-09-09 13:01:43 -0700 | [diff] [blame] | 2569 | |
| 2570 | if (value && len) { |
Stephen Smalley | 12b29f3 | 2008-05-07 13:03:20 -0400 | [diff] [blame] | 2571 | rc = security_sid_to_context_force(newsid, &context, &clen); |
Stephen Smalley | 570bc1c | 2005-09-09 13:01:43 -0700 | [diff] [blame] | 2572 | if (rc) { |
| 2573 | kfree(namep); |
| 2574 | return rc; |
| 2575 | } |
| 2576 | *value = context; |
| 2577 | *len = clen; |
| 2578 | } |
Stephen Smalley | 5e41ff9 | 2005-09-09 13:01:35 -0700 | [diff] [blame] | 2579 | |
Stephen Smalley | 5e41ff9 | 2005-09-09 13:01:35 -0700 | [diff] [blame] | 2580 | return 0; |
| 2581 | } |
| 2582 | |
Al Viro | 4acdaf2 | 2011-07-26 01:42:34 -0400 | [diff] [blame] | 2583 | 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] | 2584 | { |
| 2585 | return may_create(dir, dentry, SECCLASS_FILE); |
| 2586 | } |
| 2587 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2588 | static int selinux_inode_link(struct dentry *old_dentry, struct inode *dir, struct dentry *new_dentry) |
| 2589 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2590 | return may_link(dir, old_dentry, MAY_LINK); |
| 2591 | } |
| 2592 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2593 | static int selinux_inode_unlink(struct inode *dir, struct dentry *dentry) |
| 2594 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2595 | return may_link(dir, dentry, MAY_UNLINK); |
| 2596 | } |
| 2597 | |
| 2598 | static int selinux_inode_symlink(struct inode *dir, struct dentry *dentry, const char *name) |
| 2599 | { |
| 2600 | return may_create(dir, dentry, SECCLASS_LNK_FILE); |
| 2601 | } |
| 2602 | |
Al Viro | 18bb1db | 2011-07-26 01:41:39 -0400 | [diff] [blame] | 2603 | 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] | 2604 | { |
| 2605 | return may_create(dir, dentry, SECCLASS_DIR); |
| 2606 | } |
| 2607 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2608 | static int selinux_inode_rmdir(struct inode *dir, struct dentry *dentry) |
| 2609 | { |
| 2610 | return may_link(dir, dentry, MAY_RMDIR); |
| 2611 | } |
| 2612 | |
Al Viro | 1a67aaf | 2011-07-26 01:52:52 -0400 | [diff] [blame] | 2613 | 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] | 2614 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2615 | return may_create(dir, dentry, inode_mode_to_security_class(mode)); |
| 2616 | } |
| 2617 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2618 | 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] | 2619 | struct inode *new_inode, struct dentry *new_dentry) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2620 | { |
| 2621 | return may_rename(old_inode, old_dentry, new_inode, new_dentry); |
| 2622 | } |
| 2623 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2624 | static int selinux_inode_readlink(struct dentry *dentry) |
| 2625 | { |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 2626 | const struct cred *cred = current_cred(); |
| 2627 | |
Eric Paris | 2875fa0 | 2011-04-28 16:04:24 -0400 | [diff] [blame] | 2628 | return dentry_has_perm(cred, dentry, FILE__READ); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2629 | } |
| 2630 | |
| 2631 | static int selinux_inode_follow_link(struct dentry *dentry, struct nameidata *nameidata) |
| 2632 | { |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 2633 | const struct cred *cred = current_cred(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2634 | |
Eric Paris | 2875fa0 | 2011-04-28 16:04:24 -0400 | [diff] [blame] | 2635 | return dentry_has_perm(cred, dentry, FILE__READ); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2636 | } |
| 2637 | |
Eric Paris | d4cf970d | 2012-04-04 15:01:42 -0400 | [diff] [blame] | 2638 | static noinline int audit_inode_permission(struct inode *inode, |
| 2639 | u32 perms, u32 audited, u32 denied, |
| 2640 | unsigned flags) |
| 2641 | { |
| 2642 | struct common_audit_data ad; |
Eric Paris | d4cf970d | 2012-04-04 15:01:42 -0400 | [diff] [blame] | 2643 | struct inode_security_struct *isec = inode->i_security; |
| 2644 | int rc; |
| 2645 | |
Eric Paris | 50c205f | 2012-04-04 15:01:43 -0400 | [diff] [blame] | 2646 | ad.type = LSM_AUDIT_DATA_INODE; |
Eric Paris | d4cf970d | 2012-04-04 15:01:42 -0400 | [diff] [blame] | 2647 | ad.u.inode = inode; |
| 2648 | |
| 2649 | rc = slow_avc_audit(current_sid(), isec->sid, isec->sclass, perms, |
| 2650 | audited, denied, &ad, flags); |
| 2651 | if (rc) |
| 2652 | return rc; |
| 2653 | return 0; |
| 2654 | } |
| 2655 | |
Al Viro | e74f71e | 2011-06-20 19:38:15 -0400 | [diff] [blame] | 2656 | static int selinux_inode_permission(struct inode *inode, int mask) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2657 | { |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 2658 | const struct cred *cred = current_cred(); |
Eric Paris | b782e0a | 2010-07-23 11:44:03 -0400 | [diff] [blame] | 2659 | u32 perms; |
| 2660 | bool from_access; |
Al Viro | cf1dd1d | 2011-06-20 19:44:08 -0400 | [diff] [blame] | 2661 | unsigned flags = mask & MAY_NOT_BLOCK; |
Eric Paris | 2e33405 | 2012-04-04 15:01:42 -0400 | [diff] [blame] | 2662 | struct inode_security_struct *isec; |
| 2663 | u32 sid; |
| 2664 | struct av_decision avd; |
| 2665 | int rc, rc2; |
| 2666 | u32 audited, denied; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2667 | |
Eric Paris | b782e0a | 2010-07-23 11:44:03 -0400 | [diff] [blame] | 2668 | from_access = mask & MAY_ACCESS; |
Eric Paris | d09ca73 | 2010-07-23 11:43:57 -0400 | [diff] [blame] | 2669 | mask &= (MAY_READ|MAY_WRITE|MAY_EXEC|MAY_APPEND); |
| 2670 | |
Eric Paris | b782e0a | 2010-07-23 11:44:03 -0400 | [diff] [blame] | 2671 | /* No permission to check. Existence test. */ |
| 2672 | if (!mask) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2673 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2674 | |
Eric Paris | 2e33405 | 2012-04-04 15:01:42 -0400 | [diff] [blame] | 2675 | validate_creds(cred); |
Eric Paris | b782e0a | 2010-07-23 11:44:03 -0400 | [diff] [blame] | 2676 | |
Eric Paris | 2e33405 | 2012-04-04 15:01:42 -0400 | [diff] [blame] | 2677 | if (unlikely(IS_PRIVATE(inode))) |
| 2678 | return 0; |
Eric Paris | b782e0a | 2010-07-23 11:44:03 -0400 | [diff] [blame] | 2679 | |
| 2680 | perms = file_mask_to_av(inode->i_mode, mask); |
| 2681 | |
Eric Paris | 2e33405 | 2012-04-04 15:01:42 -0400 | [diff] [blame] | 2682 | sid = cred_sid(cred); |
| 2683 | isec = inode->i_security; |
| 2684 | |
| 2685 | rc = avc_has_perm_noaudit(sid, isec->sid, isec->sclass, perms, 0, &avd); |
| 2686 | audited = avc_audit_required(perms, &avd, rc, |
| 2687 | from_access ? FILE__AUDIT_ACCESS : 0, |
| 2688 | &denied); |
| 2689 | if (likely(!audited)) |
| 2690 | return rc; |
| 2691 | |
Eric Paris | d4cf970d | 2012-04-04 15:01:42 -0400 | [diff] [blame] | 2692 | rc2 = audit_inode_permission(inode, perms, audited, denied, flags); |
Eric Paris | 2e33405 | 2012-04-04 15:01:42 -0400 | [diff] [blame] | 2693 | if (rc2) |
| 2694 | return rc2; |
| 2695 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2696 | } |
| 2697 | |
| 2698 | static int selinux_inode_setattr(struct dentry *dentry, struct iattr *iattr) |
| 2699 | { |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 2700 | const struct cred *cred = current_cred(); |
Amerigo Wang | bc6a600 | 2009-08-20 19:29:02 -0700 | [diff] [blame] | 2701 | unsigned int ia_valid = iattr->ia_valid; |
Eric Paris | 95dbf73 | 2012-04-04 13:45:34 -0400 | [diff] [blame] | 2702 | __u32 av = FILE__WRITE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2703 | |
Amerigo Wang | bc6a600 | 2009-08-20 19:29:02 -0700 | [diff] [blame] | 2704 | /* ATTR_FORCE is just used for ATTR_KILL_S[UG]ID. */ |
| 2705 | if (ia_valid & ATTR_FORCE) { |
| 2706 | ia_valid &= ~(ATTR_KILL_SUID | ATTR_KILL_SGID | ATTR_MODE | |
| 2707 | ATTR_FORCE); |
| 2708 | if (!ia_valid) |
| 2709 | return 0; |
| 2710 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2711 | |
Amerigo Wang | bc6a600 | 2009-08-20 19:29:02 -0700 | [diff] [blame] | 2712 | if (ia_valid & (ATTR_MODE | ATTR_UID | ATTR_GID | |
| 2713 | ATTR_ATIME_SET | ATTR_MTIME_SET | ATTR_TIMES_SET)) |
Eric Paris | 2875fa0 | 2011-04-28 16:04:24 -0400 | [diff] [blame] | 2714 | return dentry_has_perm(cred, dentry, FILE__SETATTR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2715 | |
Eric Paris | 3d2195c | 2012-07-06 14:13:30 -0400 | [diff] [blame] | 2716 | if (selinux_policycap_openperm && (ia_valid & ATTR_SIZE)) |
Eric Paris | 95dbf73 | 2012-04-04 13:45:34 -0400 | [diff] [blame] | 2717 | av |= FILE__OPEN; |
| 2718 | |
| 2719 | return dentry_has_perm(cred, dentry, av); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2720 | } |
| 2721 | |
| 2722 | static int selinux_inode_getattr(struct vfsmount *mnt, struct dentry *dentry) |
| 2723 | { |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 2724 | const struct cred *cred = current_cred(); |
Eric Paris | 2875fa0 | 2011-04-28 16:04:24 -0400 | [diff] [blame] | 2725 | struct path path; |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 2726 | |
Eric Paris | 2875fa0 | 2011-04-28 16:04:24 -0400 | [diff] [blame] | 2727 | path.dentry = dentry; |
| 2728 | path.mnt = mnt; |
| 2729 | |
| 2730 | return path_has_perm(cred, &path, FILE__GETATTR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2731 | } |
| 2732 | |
David Howells | 8f0cfa5 | 2008-04-29 00:59:41 -0700 | [diff] [blame] | 2733 | static int selinux_inode_setotherxattr(struct dentry *dentry, const char *name) |
Serge E. Hallyn | b537677 | 2007-10-16 23:31:36 -0700 | [diff] [blame] | 2734 | { |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 2735 | const struct cred *cred = current_cred(); |
| 2736 | |
Serge E. Hallyn | b537677 | 2007-10-16 23:31:36 -0700 | [diff] [blame] | 2737 | if (!strncmp(name, XATTR_SECURITY_PREFIX, |
| 2738 | sizeof XATTR_SECURITY_PREFIX - 1)) { |
| 2739 | if (!strcmp(name, XATTR_NAME_CAPS)) { |
| 2740 | if (!capable(CAP_SETFCAP)) |
| 2741 | return -EPERM; |
| 2742 | } else if (!capable(CAP_SYS_ADMIN)) { |
| 2743 | /* A different attribute in the security namespace. |
| 2744 | Restrict to administrator. */ |
| 2745 | return -EPERM; |
| 2746 | } |
| 2747 | } |
| 2748 | |
| 2749 | /* Not an attribute we recognize, so just check the |
| 2750 | ordinary setattr permission. */ |
Eric Paris | 2875fa0 | 2011-04-28 16:04:24 -0400 | [diff] [blame] | 2751 | return dentry_has_perm(cred, dentry, FILE__SETATTR); |
Serge E. Hallyn | b537677 | 2007-10-16 23:31:36 -0700 | [diff] [blame] | 2752 | } |
| 2753 | |
David Howells | 8f0cfa5 | 2008-04-29 00:59:41 -0700 | [diff] [blame] | 2754 | static int selinux_inode_setxattr(struct dentry *dentry, const char *name, |
| 2755 | const void *value, size_t size, int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2756 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2757 | struct inode *inode = dentry->d_inode; |
| 2758 | struct inode_security_struct *isec = inode->i_security; |
| 2759 | struct superblock_security_struct *sbsec; |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 2760 | struct common_audit_data ad; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 2761 | u32 newsid, sid = current_sid(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2762 | int rc = 0; |
| 2763 | |
Serge E. Hallyn | b537677 | 2007-10-16 23:31:36 -0700 | [diff] [blame] | 2764 | if (strcmp(name, XATTR_NAME_SELINUX)) |
| 2765 | return selinux_inode_setotherxattr(dentry, name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2766 | |
| 2767 | sbsec = inode->i_sb->s_security; |
David P. Quigley | cd89596 | 2009-01-16 09:22:04 -0500 | [diff] [blame] | 2768 | if (!(sbsec->flags & SE_SBLABELSUPP)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2769 | return -EOPNOTSUPP; |
| 2770 | |
Serge E. Hallyn | 2e14967 | 2011-03-23 16:43:26 -0700 | [diff] [blame] | 2771 | if (!inode_owner_or_capable(inode)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2772 | return -EPERM; |
| 2773 | |
Eric Paris | 50c205f | 2012-04-04 15:01:43 -0400 | [diff] [blame] | 2774 | ad.type = LSM_AUDIT_DATA_DENTRY; |
Eric Paris | a269434 | 2011-04-25 13:10:27 -0400 | [diff] [blame] | 2775 | ad.u.dentry = dentry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2776 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 2777 | rc = avc_has_perm(sid, isec->sid, isec->sclass, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2778 | FILE__RELABELFROM, &ad); |
| 2779 | if (rc) |
| 2780 | return rc; |
| 2781 | |
| 2782 | rc = security_context_to_sid(value, size, &newsid); |
Stephen Smalley | 12b29f3 | 2008-05-07 13:03:20 -0400 | [diff] [blame] | 2783 | if (rc == -EINVAL) { |
Eric Paris | d6ea83e | 2012-04-04 13:45:49 -0400 | [diff] [blame] | 2784 | if (!capable(CAP_MAC_ADMIN)) { |
| 2785 | struct audit_buffer *ab; |
| 2786 | size_t audit_size; |
| 2787 | const char *str; |
| 2788 | |
| 2789 | /* We strip a nul only if it is at the end, otherwise the |
| 2790 | * context contains a nul and we should audit that */ |
Al Viro | e3fea3f | 2012-06-09 08:15:16 +0100 | [diff] [blame] | 2791 | if (value) { |
| 2792 | str = value; |
| 2793 | if (str[size - 1] == '\0') |
| 2794 | audit_size = size - 1; |
| 2795 | else |
| 2796 | audit_size = size; |
| 2797 | } else { |
| 2798 | str = ""; |
| 2799 | audit_size = 0; |
| 2800 | } |
Eric Paris | d6ea83e | 2012-04-04 13:45:49 -0400 | [diff] [blame] | 2801 | ab = audit_log_start(current->audit_context, GFP_ATOMIC, AUDIT_SELINUX_ERR); |
| 2802 | audit_log_format(ab, "op=setxattr invalid_context="); |
| 2803 | audit_log_n_untrustedstring(ab, value, audit_size); |
| 2804 | audit_log_end(ab); |
| 2805 | |
Stephen Smalley | 12b29f3 | 2008-05-07 13:03:20 -0400 | [diff] [blame] | 2806 | return rc; |
Eric Paris | d6ea83e | 2012-04-04 13:45:49 -0400 | [diff] [blame] | 2807 | } |
Stephen Smalley | 12b29f3 | 2008-05-07 13:03:20 -0400 | [diff] [blame] | 2808 | rc = security_context_to_sid_force(value, size, &newsid); |
| 2809 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2810 | if (rc) |
| 2811 | return rc; |
| 2812 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 2813 | rc = avc_has_perm(sid, newsid, isec->sclass, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2814 | FILE__RELABELTO, &ad); |
| 2815 | if (rc) |
| 2816 | return rc; |
| 2817 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 2818 | rc = security_validate_transition(isec->sid, newsid, sid, |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 2819 | isec->sclass); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2820 | if (rc) |
| 2821 | return rc; |
| 2822 | |
| 2823 | return avc_has_perm(newsid, |
| 2824 | sbsec->sid, |
| 2825 | SECCLASS_FILESYSTEM, |
| 2826 | FILESYSTEM__ASSOCIATE, |
| 2827 | &ad); |
| 2828 | } |
| 2829 | |
David Howells | 8f0cfa5 | 2008-04-29 00:59:41 -0700 | [diff] [blame] | 2830 | static void selinux_inode_post_setxattr(struct dentry *dentry, const char *name, |
Eric Paris | f526971 | 2008-05-14 11:27:45 -0400 | [diff] [blame] | 2831 | const void *value, size_t size, |
David Howells | 8f0cfa5 | 2008-04-29 00:59:41 -0700 | [diff] [blame] | 2832 | int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2833 | { |
| 2834 | struct inode *inode = dentry->d_inode; |
| 2835 | struct inode_security_struct *isec = inode->i_security; |
| 2836 | u32 newsid; |
| 2837 | int rc; |
| 2838 | |
| 2839 | if (strcmp(name, XATTR_NAME_SELINUX)) { |
| 2840 | /* Not an attribute we recognize, so nothing to do. */ |
| 2841 | return; |
| 2842 | } |
| 2843 | |
Stephen Smalley | 12b29f3 | 2008-05-07 13:03:20 -0400 | [diff] [blame] | 2844 | rc = security_context_to_sid_force(value, size, &newsid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2845 | if (rc) { |
Stephen Smalley | 12b29f3 | 2008-05-07 13:03:20 -0400 | [diff] [blame] | 2846 | printk(KERN_ERR "SELinux: unable to map context to SID" |
| 2847 | "for (%s, %lu), rc=%d\n", |
| 2848 | inode->i_sb->s_id, inode->i_ino, -rc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2849 | return; |
| 2850 | } |
| 2851 | |
| 2852 | isec->sid = newsid; |
| 2853 | return; |
| 2854 | } |
| 2855 | |
David Howells | 8f0cfa5 | 2008-04-29 00:59:41 -0700 | [diff] [blame] | 2856 | static int selinux_inode_getxattr(struct dentry *dentry, const char *name) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2857 | { |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 2858 | const struct cred *cred = current_cred(); |
| 2859 | |
Eric Paris | 2875fa0 | 2011-04-28 16:04:24 -0400 | [diff] [blame] | 2860 | return dentry_has_perm(cred, dentry, FILE__GETATTR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2861 | } |
| 2862 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 2863 | static int selinux_inode_listxattr(struct dentry *dentry) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2864 | { |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 2865 | const struct cred *cred = current_cred(); |
| 2866 | |
Eric Paris | 2875fa0 | 2011-04-28 16:04:24 -0400 | [diff] [blame] | 2867 | return dentry_has_perm(cred, dentry, FILE__GETATTR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2868 | } |
| 2869 | |
David Howells | 8f0cfa5 | 2008-04-29 00:59:41 -0700 | [diff] [blame] | 2870 | static int selinux_inode_removexattr(struct dentry *dentry, const char *name) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2871 | { |
Serge E. Hallyn | b537677 | 2007-10-16 23:31:36 -0700 | [diff] [blame] | 2872 | if (strcmp(name, XATTR_NAME_SELINUX)) |
| 2873 | return selinux_inode_setotherxattr(dentry, name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2874 | |
| 2875 | /* No one is allowed to remove a SELinux security label. |
| 2876 | You can change the label, but all data must be labeled. */ |
| 2877 | return -EACCES; |
| 2878 | } |
| 2879 | |
James Morris | d381d8a | 2005-10-30 14:59:22 -0800 | [diff] [blame] | 2880 | /* |
Stephen Smalley | abc69bb | 2008-05-21 14:16:12 -0400 | [diff] [blame] | 2881 | * Copy the inode security context value to the user. |
James Morris | d381d8a | 2005-10-30 14:59:22 -0800 | [diff] [blame] | 2882 | * |
| 2883 | * Permission check is handled by selinux_inode_getxattr hook. |
| 2884 | */ |
David P. Quigley | 4249259 | 2008-02-04 22:29:39 -0800 | [diff] [blame] | 2885 | static int selinux_inode_getsecurity(const struct inode *inode, const char *name, void **buffer, bool alloc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2886 | { |
David P. Quigley | 4249259 | 2008-02-04 22:29:39 -0800 | [diff] [blame] | 2887 | u32 size; |
| 2888 | int error; |
| 2889 | char *context = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2890 | struct inode_security_struct *isec = inode->i_security; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2891 | |
Dustin Kirkland | 8c8570f | 2005-11-03 17:15:16 +0000 | [diff] [blame] | 2892 | if (strcmp(name, XATTR_SELINUX_SUFFIX)) |
| 2893 | return -EOPNOTSUPP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2894 | |
Stephen Smalley | abc69bb | 2008-05-21 14:16:12 -0400 | [diff] [blame] | 2895 | /* |
| 2896 | * If the caller has CAP_MAC_ADMIN, then get the raw context |
| 2897 | * value even if it is not defined by current policy; otherwise, |
| 2898 | * use the in-core value under current policy. |
| 2899 | * Use the non-auditing forms of the permission checks since |
| 2900 | * getxattr may be called by unprivileged processes commonly |
| 2901 | * and lack of permission just means that we fall back to the |
| 2902 | * in-core context value, not a denial. |
| 2903 | */ |
Eric Paris | 6a9de49 | 2012-01-03 12:25:14 -0500 | [diff] [blame] | 2904 | error = selinux_capable(current_cred(), &init_user_ns, CAP_MAC_ADMIN, |
David Howells | 3699c53 | 2009-01-06 22:27:01 +0000 | [diff] [blame] | 2905 | SECURITY_CAP_NOAUDIT); |
Stephen Smalley | abc69bb | 2008-05-21 14:16:12 -0400 | [diff] [blame] | 2906 | if (!error) |
| 2907 | error = security_sid_to_context_force(isec->sid, &context, |
| 2908 | &size); |
| 2909 | else |
| 2910 | error = security_sid_to_context(isec->sid, &context, &size); |
David P. Quigley | 4249259 | 2008-02-04 22:29:39 -0800 | [diff] [blame] | 2911 | if (error) |
| 2912 | return error; |
| 2913 | error = size; |
| 2914 | if (alloc) { |
| 2915 | *buffer = context; |
| 2916 | goto out_nofree; |
| 2917 | } |
| 2918 | kfree(context); |
| 2919 | out_nofree: |
| 2920 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2921 | } |
| 2922 | |
| 2923 | static int selinux_inode_setsecurity(struct inode *inode, const char *name, |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 2924 | const void *value, size_t size, int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2925 | { |
| 2926 | struct inode_security_struct *isec = inode->i_security; |
| 2927 | u32 newsid; |
| 2928 | int rc; |
| 2929 | |
| 2930 | if (strcmp(name, XATTR_SELINUX_SUFFIX)) |
| 2931 | return -EOPNOTSUPP; |
| 2932 | |
| 2933 | if (!value || !size) |
| 2934 | return -EACCES; |
| 2935 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 2936 | rc = security_context_to_sid((void *)value, size, &newsid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2937 | if (rc) |
| 2938 | return rc; |
| 2939 | |
| 2940 | isec->sid = newsid; |
David P. Quigley | ddd29ec | 2009-09-09 14:25:37 -0400 | [diff] [blame] | 2941 | isec->initialized = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2942 | return 0; |
| 2943 | } |
| 2944 | |
| 2945 | static int selinux_inode_listsecurity(struct inode *inode, char *buffer, size_t buffer_size) |
| 2946 | { |
| 2947 | const int len = sizeof(XATTR_NAME_SELINUX); |
| 2948 | if (buffer && len <= buffer_size) |
| 2949 | memcpy(buffer, XATTR_NAME_SELINUX, len); |
| 2950 | return len; |
| 2951 | } |
| 2952 | |
Ahmed S. Darwish | 713a04ae | 2008-03-01 21:52:30 +0200 | [diff] [blame] | 2953 | static void selinux_inode_getsecid(const struct inode *inode, u32 *secid) |
| 2954 | { |
| 2955 | struct inode_security_struct *isec = inode->i_security; |
| 2956 | *secid = isec->sid; |
| 2957 | } |
| 2958 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2959 | /* file security operations */ |
| 2960 | |
Yuichi Nakamura | 788e7dd | 2007-09-14 09:27:07 +0900 | [diff] [blame] | 2961 | static int selinux_revalidate_file_permission(struct file *file, int mask) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2962 | { |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 2963 | const struct cred *cred = current_cred(); |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 2964 | struct inode *inode = file_inode(file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2965 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2966 | /* file_mask_to_av won't add FILE__WRITE if MAY_APPEND is set */ |
| 2967 | if ((file->f_flags & O_APPEND) && (mask & MAY_WRITE)) |
| 2968 | mask |= MAY_APPEND; |
| 2969 | |
Paul Moore | 389fb800 | 2009-03-27 17:10:34 -0400 | [diff] [blame] | 2970 | return file_has_perm(cred, file, |
| 2971 | file_mask_to_av(inode->i_mode, mask)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2972 | } |
| 2973 | |
Yuichi Nakamura | 788e7dd | 2007-09-14 09:27:07 +0900 | [diff] [blame] | 2974 | static int selinux_file_permission(struct file *file, int mask) |
| 2975 | { |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 2976 | struct inode *inode = file_inode(file); |
Stephen Smalley | 20dda18 | 2009-06-22 14:54:53 -0400 | [diff] [blame] | 2977 | struct file_security_struct *fsec = file->f_security; |
| 2978 | struct inode_security_struct *isec = inode->i_security; |
| 2979 | u32 sid = current_sid(); |
| 2980 | |
Paul Moore | 389fb800 | 2009-03-27 17:10:34 -0400 | [diff] [blame] | 2981 | if (!mask) |
Yuichi Nakamura | 788e7dd | 2007-09-14 09:27:07 +0900 | [diff] [blame] | 2982 | /* No permission to check. Existence test. */ |
| 2983 | return 0; |
Yuichi Nakamura | 788e7dd | 2007-09-14 09:27:07 +0900 | [diff] [blame] | 2984 | |
Stephen Smalley | 20dda18 | 2009-06-22 14:54:53 -0400 | [diff] [blame] | 2985 | if (sid == fsec->sid && fsec->isid == isec->sid && |
| 2986 | fsec->pseqno == avc_policy_seqno()) |
Eric Paris | 83d4985 | 2012-04-04 13:45:40 -0400 | [diff] [blame] | 2987 | /* No change since file_open check. */ |
Stephen Smalley | 20dda18 | 2009-06-22 14:54:53 -0400 | [diff] [blame] | 2988 | return 0; |
| 2989 | |
Yuichi Nakamura | 788e7dd | 2007-09-14 09:27:07 +0900 | [diff] [blame] | 2990 | return selinux_revalidate_file_permission(file, mask); |
| 2991 | } |
| 2992 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2993 | static int selinux_file_alloc_security(struct file *file) |
| 2994 | { |
| 2995 | return file_alloc_security(file); |
| 2996 | } |
| 2997 | |
| 2998 | static void selinux_file_free_security(struct file *file) |
| 2999 | { |
| 3000 | file_free_security(file); |
| 3001 | } |
| 3002 | |
| 3003 | static int selinux_file_ioctl(struct file *file, unsigned int cmd, |
| 3004 | unsigned long arg) |
| 3005 | { |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 3006 | const struct cred *cred = current_cred(); |
Eric Paris | 0b24dcb | 2011-02-25 15:39:20 -0500 | [diff] [blame] | 3007 | int error = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3008 | |
Eric Paris | 0b24dcb | 2011-02-25 15:39:20 -0500 | [diff] [blame] | 3009 | switch (cmd) { |
| 3010 | case FIONREAD: |
| 3011 | /* fall through */ |
| 3012 | case FIBMAP: |
| 3013 | /* fall through */ |
| 3014 | case FIGETBSZ: |
| 3015 | /* fall through */ |
Al Viro | 2f99c36 | 2012-03-23 16:04:05 -0400 | [diff] [blame] | 3016 | case FS_IOC_GETFLAGS: |
Eric Paris | 0b24dcb | 2011-02-25 15:39:20 -0500 | [diff] [blame] | 3017 | /* fall through */ |
Al Viro | 2f99c36 | 2012-03-23 16:04:05 -0400 | [diff] [blame] | 3018 | case FS_IOC_GETVERSION: |
Eric Paris | 0b24dcb | 2011-02-25 15:39:20 -0500 | [diff] [blame] | 3019 | error = file_has_perm(cred, file, FILE__GETATTR); |
| 3020 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3021 | |
Al Viro | 2f99c36 | 2012-03-23 16:04:05 -0400 | [diff] [blame] | 3022 | case FS_IOC_SETFLAGS: |
Eric Paris | 0b24dcb | 2011-02-25 15:39:20 -0500 | [diff] [blame] | 3023 | /* fall through */ |
Al Viro | 2f99c36 | 2012-03-23 16:04:05 -0400 | [diff] [blame] | 3024 | case FS_IOC_SETVERSION: |
Eric Paris | 0b24dcb | 2011-02-25 15:39:20 -0500 | [diff] [blame] | 3025 | error = file_has_perm(cred, file, FILE__SETATTR); |
| 3026 | break; |
| 3027 | |
| 3028 | /* sys_ioctl() checks */ |
| 3029 | case FIONBIO: |
| 3030 | /* fall through */ |
| 3031 | case FIOASYNC: |
| 3032 | error = file_has_perm(cred, file, 0); |
| 3033 | break; |
| 3034 | |
| 3035 | case KDSKBENT: |
| 3036 | case KDSKBSENT: |
Eric Paris | 6a9de49 | 2012-01-03 12:25:14 -0500 | [diff] [blame] | 3037 | error = cred_has_capability(cred, CAP_SYS_TTY_CONFIG, |
| 3038 | SECURITY_CAP_AUDIT); |
Eric Paris | 0b24dcb | 2011-02-25 15:39:20 -0500 | [diff] [blame] | 3039 | break; |
| 3040 | |
| 3041 | /* default case assumes that the command will go |
| 3042 | * to the file's ioctl() function. |
| 3043 | */ |
| 3044 | default: |
| 3045 | error = file_has_perm(cred, file, FILE__IOCTL); |
| 3046 | } |
| 3047 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3048 | } |
| 3049 | |
Stephen Smalley | fcaaade | 2010-04-28 15:57:57 -0400 | [diff] [blame] | 3050 | static int default_noexec; |
| 3051 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3052 | static int file_map_prot_check(struct file *file, unsigned long prot, int shared) |
| 3053 | { |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 3054 | const struct cred *cred = current_cred(); |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 3055 | int rc = 0; |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 3056 | |
Stephen Smalley | fcaaade | 2010-04-28 15:57:57 -0400 | [diff] [blame] | 3057 | if (default_noexec && |
| 3058 | (prot & PROT_EXEC) && (!file || (!shared && (prot & PROT_WRITE)))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3059 | /* |
| 3060 | * We are making executable an anonymous mapping or a |
| 3061 | * private file mapping that will also be writable. |
| 3062 | * This has an additional check. |
| 3063 | */ |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 3064 | rc = cred_has_perm(cred, cred, PROCESS__EXECMEM); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3065 | if (rc) |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 3066 | goto error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3067 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3068 | |
| 3069 | if (file) { |
| 3070 | /* read access is always possible with a mapping */ |
| 3071 | u32 av = FILE__READ; |
| 3072 | |
| 3073 | /* write access only matters if the mapping is shared */ |
| 3074 | if (shared && (prot & PROT_WRITE)) |
| 3075 | av |= FILE__WRITE; |
| 3076 | |
| 3077 | if (prot & PROT_EXEC) |
| 3078 | av |= FILE__EXECUTE; |
| 3079 | |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 3080 | return file_has_perm(cred, file, av); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3081 | } |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 3082 | |
| 3083 | error: |
| 3084 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3085 | } |
| 3086 | |
Al Viro | e546785 | 2012-05-30 13:30:51 -0400 | [diff] [blame] | 3087 | static int selinux_mmap_addr(unsigned long addr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3088 | { |
Eric Paris | ed03218 | 2007-06-28 15:55:21 -0400 | [diff] [blame] | 3089 | int rc = 0; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 3090 | u32 sid = current_sid(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3091 | |
Eric Paris | 84336d1a | 2009-07-31 12:54:05 -0400 | [diff] [blame] | 3092 | /* |
| 3093 | * notice that we are intentionally putting the SELinux check before |
| 3094 | * the secondary cap_file_mmap check. This is such a likely attempt |
| 3095 | * at bad behaviour/exploit that we always want to get the AVC, even |
| 3096 | * if DAC would have also denied the operation. |
| 3097 | */ |
Eric Paris | a2551df | 2009-07-31 12:54:11 -0400 | [diff] [blame] | 3098 | if (addr < CONFIG_LSM_MMAP_MIN_ADDR) { |
Eric Paris | ed03218 | 2007-06-28 15:55:21 -0400 | [diff] [blame] | 3099 | rc = avc_has_perm(sid, sid, SECCLASS_MEMPROTECT, |
| 3100 | MEMPROTECT__MMAP_ZERO, NULL); |
Eric Paris | 84336d1a | 2009-07-31 12:54:05 -0400 | [diff] [blame] | 3101 | if (rc) |
| 3102 | return rc; |
| 3103 | } |
| 3104 | |
| 3105 | /* do DAC check on address space usage */ |
Al Viro | e546785 | 2012-05-30 13:30:51 -0400 | [diff] [blame] | 3106 | return cap_mmap_addr(addr); |
| 3107 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3108 | |
Al Viro | e546785 | 2012-05-30 13:30:51 -0400 | [diff] [blame] | 3109 | static int selinux_mmap_file(struct file *file, unsigned long reqprot, |
| 3110 | unsigned long prot, unsigned long flags) |
| 3111 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3112 | if (selinux_checkreqprot) |
| 3113 | prot = reqprot; |
| 3114 | |
| 3115 | return file_map_prot_check(file, prot, |
| 3116 | (flags & MAP_TYPE) == MAP_SHARED); |
| 3117 | } |
| 3118 | |
| 3119 | static int selinux_file_mprotect(struct vm_area_struct *vma, |
| 3120 | unsigned long reqprot, |
| 3121 | unsigned long prot) |
| 3122 | { |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 3123 | const struct cred *cred = current_cred(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3124 | |
| 3125 | if (selinux_checkreqprot) |
| 3126 | prot = reqprot; |
| 3127 | |
Stephen Smalley | fcaaade | 2010-04-28 15:57:57 -0400 | [diff] [blame] | 3128 | if (default_noexec && |
| 3129 | (prot & PROT_EXEC) && !(vma->vm_flags & VM_EXEC)) { |
James Morris | d541bbe | 2009-01-29 12:19:51 +1100 | [diff] [blame] | 3130 | int rc = 0; |
Stephen Smalley | db4c964 | 2006-02-01 03:05:54 -0800 | [diff] [blame] | 3131 | if (vma->vm_start >= vma->vm_mm->start_brk && |
| 3132 | vma->vm_end <= vma->vm_mm->brk) { |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 3133 | rc = cred_has_perm(cred, cred, PROCESS__EXECHEAP); |
Stephen Smalley | db4c964 | 2006-02-01 03:05:54 -0800 | [diff] [blame] | 3134 | } else if (!vma->vm_file && |
| 3135 | vma->vm_start <= vma->vm_mm->start_stack && |
| 3136 | vma->vm_end >= vma->vm_mm->start_stack) { |
David Howells | 3b11a1d | 2008-11-14 10:39:26 +1100 | [diff] [blame] | 3137 | rc = current_has_perm(current, PROCESS__EXECSTACK); |
Stephen Smalley | db4c964 | 2006-02-01 03:05:54 -0800 | [diff] [blame] | 3138 | } else if (vma->vm_file && vma->anon_vma) { |
| 3139 | /* |
| 3140 | * We are making executable a file mapping that has |
| 3141 | * had some COW done. Since pages might have been |
| 3142 | * written, check ability to execute the possibly |
| 3143 | * modified content. This typically should only |
| 3144 | * occur for text relocations. |
| 3145 | */ |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 3146 | rc = file_has_perm(cred, vma->vm_file, FILE__EXECMOD); |
Stephen Smalley | db4c964 | 2006-02-01 03:05:54 -0800 | [diff] [blame] | 3147 | } |
Lorenzo Hernandez GarcÃa-Hierro | 6b99219 | 2005-06-25 14:54:34 -0700 | [diff] [blame] | 3148 | if (rc) |
| 3149 | return rc; |
| 3150 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3151 | |
| 3152 | return file_map_prot_check(vma->vm_file, prot, vma->vm_flags&VM_SHARED); |
| 3153 | } |
| 3154 | |
| 3155 | static int selinux_file_lock(struct file *file, unsigned int cmd) |
| 3156 | { |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 3157 | const struct cred *cred = current_cred(); |
| 3158 | |
| 3159 | return file_has_perm(cred, file, FILE__LOCK); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3160 | } |
| 3161 | |
| 3162 | static int selinux_file_fcntl(struct file *file, unsigned int cmd, |
| 3163 | unsigned long arg) |
| 3164 | { |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 3165 | const struct cred *cred = current_cred(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3166 | int err = 0; |
| 3167 | |
| 3168 | switch (cmd) { |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3169 | case F_SETFL: |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3170 | if ((file->f_flags & O_APPEND) && !(arg & O_APPEND)) { |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 3171 | err = file_has_perm(cred, file, FILE__WRITE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3172 | break; |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3173 | } |
| 3174 | /* fall through */ |
| 3175 | case F_SETOWN: |
| 3176 | case F_SETSIG: |
| 3177 | case F_GETFL: |
| 3178 | case F_GETOWN: |
| 3179 | case F_GETSIG: |
Cyrill Gorcunov | 1d151c3 | 2012-07-30 14:43:00 -0700 | [diff] [blame] | 3180 | case F_GETOWNER_UIDS: |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3181 | /* Just check FD__USE permission */ |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 3182 | err = file_has_perm(cred, file, 0); |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3183 | break; |
| 3184 | case F_GETLK: |
| 3185 | case F_SETLK: |
| 3186 | case F_SETLKW: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3187 | #if BITS_PER_LONG == 32 |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3188 | case F_GETLK64: |
| 3189 | case F_SETLK64: |
| 3190 | case F_SETLKW64: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3191 | #endif |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 3192 | err = file_has_perm(cred, file, FILE__LOCK); |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3193 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3194 | } |
| 3195 | |
| 3196 | return err; |
| 3197 | } |
| 3198 | |
| 3199 | static int selinux_file_set_fowner(struct file *file) |
| 3200 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3201 | struct file_security_struct *fsec; |
| 3202 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3203 | fsec = file->f_security; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 3204 | fsec->fown_sid = current_sid(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3205 | |
| 3206 | return 0; |
| 3207 | } |
| 3208 | |
| 3209 | static int selinux_file_send_sigiotask(struct task_struct *tsk, |
| 3210 | struct fown_struct *fown, int signum) |
| 3211 | { |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3212 | struct file *file; |
Stephen Smalley | 65c90bc | 2009-05-04 15:43:18 -0400 | [diff] [blame] | 3213 | u32 sid = task_sid(tsk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3214 | u32 perm; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3215 | struct file_security_struct *fsec; |
| 3216 | |
| 3217 | /* struct fown_struct is never outside the context of a struct file */ |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3218 | file = container_of(fown, struct file, f_owner); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3219 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3220 | fsec = file->f_security; |
| 3221 | |
| 3222 | if (!signum) |
| 3223 | perm = signal_to_av(SIGIO); /* as per send_sigio_to_task */ |
| 3224 | else |
| 3225 | perm = signal_to_av(signum); |
| 3226 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 3227 | return avc_has_perm(fsec->fown_sid, sid, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3228 | SECCLASS_PROCESS, perm, NULL); |
| 3229 | } |
| 3230 | |
| 3231 | static int selinux_file_receive(struct file *file) |
| 3232 | { |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 3233 | const struct cred *cred = current_cred(); |
| 3234 | |
| 3235 | return file_has_perm(cred, file, file_to_av(file)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3236 | } |
| 3237 | |
Eric Paris | 83d4985 | 2012-04-04 13:45:40 -0400 | [diff] [blame] | 3238 | static int selinux_file_open(struct file *file, const struct cred *cred) |
Yuichi Nakamura | 788e7dd | 2007-09-14 09:27:07 +0900 | [diff] [blame] | 3239 | { |
| 3240 | struct file_security_struct *fsec; |
Yuichi Nakamura | 788e7dd | 2007-09-14 09:27:07 +0900 | [diff] [blame] | 3241 | struct inode_security_struct *isec; |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 3242 | |
Yuichi Nakamura | 788e7dd | 2007-09-14 09:27:07 +0900 | [diff] [blame] | 3243 | fsec = file->f_security; |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 3244 | isec = file_inode(file)->i_security; |
Yuichi Nakamura | 788e7dd | 2007-09-14 09:27:07 +0900 | [diff] [blame] | 3245 | /* |
| 3246 | * Save inode label and policy sequence number |
| 3247 | * at open-time so that selinux_file_permission |
| 3248 | * can determine whether revalidation is necessary. |
| 3249 | * Task label is already saved in the file security |
| 3250 | * struct as its SID. |
| 3251 | */ |
| 3252 | fsec->isid = isec->sid; |
| 3253 | fsec->pseqno = avc_policy_seqno(); |
| 3254 | /* |
| 3255 | * Since the inode label or policy seqno may have changed |
| 3256 | * between the selinux_inode_permission check and the saving |
| 3257 | * of state above, recheck that access is still permitted. |
| 3258 | * Otherwise, access might never be revalidated against the |
| 3259 | * new inode label or new policy. |
| 3260 | * This check is not redundant - do not remove. |
| 3261 | */ |
Eric Paris | 602a8dd | 2012-04-04 15:01:42 -0400 | [diff] [blame] | 3262 | return path_has_perm(cred, &file->f_path, open_file_to_av(file)); |
Yuichi Nakamura | 788e7dd | 2007-09-14 09:27:07 +0900 | [diff] [blame] | 3263 | } |
| 3264 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3265 | /* task security operations */ |
| 3266 | |
| 3267 | static int selinux_task_create(unsigned long clone_flags) |
| 3268 | { |
David Howells | 3b11a1d | 2008-11-14 10:39:26 +1100 | [diff] [blame] | 3269 | return current_has_perm(current, PROCESS__FORK); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3270 | } |
| 3271 | |
David Howells | f1752ee | 2008-11-14 10:39:17 +1100 | [diff] [blame] | 3272 | /* |
David Howells | ee18d64 | 2009-09-02 09:14:21 +0100 | [diff] [blame] | 3273 | * allocate the SELinux part of blank credentials |
| 3274 | */ |
| 3275 | static int selinux_cred_alloc_blank(struct cred *cred, gfp_t gfp) |
| 3276 | { |
| 3277 | struct task_security_struct *tsec; |
| 3278 | |
| 3279 | tsec = kzalloc(sizeof(struct task_security_struct), gfp); |
| 3280 | if (!tsec) |
| 3281 | return -ENOMEM; |
| 3282 | |
| 3283 | cred->security = tsec; |
| 3284 | return 0; |
| 3285 | } |
| 3286 | |
| 3287 | /* |
David Howells | f1752ee | 2008-11-14 10:39:17 +1100 | [diff] [blame] | 3288 | * detach and free the LSM part of a set of credentials |
| 3289 | */ |
| 3290 | static void selinux_cred_free(struct cred *cred) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3291 | { |
David Howells | f1752ee | 2008-11-14 10:39:17 +1100 | [diff] [blame] | 3292 | struct task_security_struct *tsec = cred->security; |
David Howells | e0e8173 | 2009-09-02 09:13:40 +0100 | [diff] [blame] | 3293 | |
Tetsuo Handa | 2edeaa3 | 2011-02-07 13:36:10 +0000 | [diff] [blame] | 3294 | /* |
| 3295 | * cred->security == NULL if security_cred_alloc_blank() or |
| 3296 | * security_prepare_creds() returned an error. |
| 3297 | */ |
| 3298 | BUG_ON(cred->security && (unsigned long) cred->security < PAGE_SIZE); |
David Howells | e0e8173 | 2009-09-02 09:13:40 +0100 | [diff] [blame] | 3299 | cred->security = (void *) 0x7UL; |
David Howells | f1752ee | 2008-11-14 10:39:17 +1100 | [diff] [blame] | 3300 | kfree(tsec); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3301 | } |
| 3302 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 3303 | /* |
| 3304 | * prepare a new set of credentials for modification |
| 3305 | */ |
| 3306 | static int selinux_cred_prepare(struct cred *new, const struct cred *old, |
| 3307 | gfp_t gfp) |
| 3308 | { |
| 3309 | const struct task_security_struct *old_tsec; |
| 3310 | struct task_security_struct *tsec; |
| 3311 | |
| 3312 | old_tsec = old->security; |
| 3313 | |
| 3314 | tsec = kmemdup(old_tsec, sizeof(struct task_security_struct), gfp); |
| 3315 | if (!tsec) |
| 3316 | return -ENOMEM; |
| 3317 | |
| 3318 | new->security = tsec; |
| 3319 | return 0; |
| 3320 | } |
| 3321 | |
| 3322 | /* |
David Howells | ee18d64 | 2009-09-02 09:14:21 +0100 | [diff] [blame] | 3323 | * transfer the SELinux data to a blank set of creds |
| 3324 | */ |
| 3325 | static void selinux_cred_transfer(struct cred *new, const struct cred *old) |
| 3326 | { |
| 3327 | const struct task_security_struct *old_tsec = old->security; |
| 3328 | struct task_security_struct *tsec = new->security; |
| 3329 | |
| 3330 | *tsec = *old_tsec; |
| 3331 | } |
| 3332 | |
| 3333 | /* |
David Howells | 3a3b7ce | 2008-11-14 10:39:28 +1100 | [diff] [blame] | 3334 | * set the security data for a kernel service |
| 3335 | * - all the creation contexts are set to unlabelled |
| 3336 | */ |
| 3337 | static int selinux_kernel_act_as(struct cred *new, u32 secid) |
| 3338 | { |
| 3339 | struct task_security_struct *tsec = new->security; |
| 3340 | u32 sid = current_sid(); |
| 3341 | int ret; |
| 3342 | |
| 3343 | ret = avc_has_perm(sid, secid, |
| 3344 | SECCLASS_KERNEL_SERVICE, |
| 3345 | KERNEL_SERVICE__USE_AS_OVERRIDE, |
| 3346 | NULL); |
| 3347 | if (ret == 0) { |
| 3348 | tsec->sid = secid; |
| 3349 | tsec->create_sid = 0; |
| 3350 | tsec->keycreate_sid = 0; |
| 3351 | tsec->sockcreate_sid = 0; |
| 3352 | } |
| 3353 | return ret; |
| 3354 | } |
| 3355 | |
| 3356 | /* |
| 3357 | * set the file creation context in a security record to the same as the |
| 3358 | * objective context of the specified inode |
| 3359 | */ |
| 3360 | static int selinux_kernel_create_files_as(struct cred *new, struct inode *inode) |
| 3361 | { |
| 3362 | struct inode_security_struct *isec = inode->i_security; |
| 3363 | struct task_security_struct *tsec = new->security; |
| 3364 | u32 sid = current_sid(); |
| 3365 | int ret; |
| 3366 | |
| 3367 | ret = avc_has_perm(sid, isec->sid, |
| 3368 | SECCLASS_KERNEL_SERVICE, |
| 3369 | KERNEL_SERVICE__CREATE_FILES_AS, |
| 3370 | NULL); |
| 3371 | |
| 3372 | if (ret == 0) |
| 3373 | tsec->create_sid = isec->sid; |
David Howells | ef57471 | 2010-02-26 01:56:16 +0000 | [diff] [blame] | 3374 | return ret; |
David Howells | 3a3b7ce | 2008-11-14 10:39:28 +1100 | [diff] [blame] | 3375 | } |
| 3376 | |
Eric Paris | dd8dbf2 | 2009-11-03 16:35:32 +1100 | [diff] [blame] | 3377 | static int selinux_kernel_module_request(char *kmod_name) |
Eric Paris | 25354c4 | 2009-08-13 09:45:03 -0400 | [diff] [blame] | 3378 | { |
Eric Paris | dd8dbf2 | 2009-11-03 16:35:32 +1100 | [diff] [blame] | 3379 | u32 sid; |
| 3380 | struct common_audit_data ad; |
| 3381 | |
| 3382 | sid = task_sid(current); |
| 3383 | |
Eric Paris | 50c205f | 2012-04-04 15:01:43 -0400 | [diff] [blame] | 3384 | ad.type = LSM_AUDIT_DATA_KMOD; |
Eric Paris | dd8dbf2 | 2009-11-03 16:35:32 +1100 | [diff] [blame] | 3385 | ad.u.kmod_name = kmod_name; |
| 3386 | |
| 3387 | return avc_has_perm(sid, SECINITSID_KERNEL, SECCLASS_SYSTEM, |
| 3388 | SYSTEM__MODULE_REQUEST, &ad); |
Eric Paris | 25354c4 | 2009-08-13 09:45:03 -0400 | [diff] [blame] | 3389 | } |
| 3390 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3391 | static int selinux_task_setpgid(struct task_struct *p, pid_t pgid) |
| 3392 | { |
David Howells | 3b11a1d | 2008-11-14 10:39:26 +1100 | [diff] [blame] | 3393 | return current_has_perm(p, PROCESS__SETPGID); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3394 | } |
| 3395 | |
| 3396 | static int selinux_task_getpgid(struct task_struct *p) |
| 3397 | { |
David Howells | 3b11a1d | 2008-11-14 10:39:26 +1100 | [diff] [blame] | 3398 | return current_has_perm(p, PROCESS__GETPGID); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3399 | } |
| 3400 | |
| 3401 | static int selinux_task_getsid(struct task_struct *p) |
| 3402 | { |
David Howells | 3b11a1d | 2008-11-14 10:39:26 +1100 | [diff] [blame] | 3403 | return current_has_perm(p, PROCESS__GETSESSION); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3404 | } |
| 3405 | |
David Quigley | f9008e4 | 2006-06-30 01:55:46 -0700 | [diff] [blame] | 3406 | static void selinux_task_getsecid(struct task_struct *p, u32 *secid) |
| 3407 | { |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 3408 | *secid = task_sid(p); |
David Quigley | f9008e4 | 2006-06-30 01:55:46 -0700 | [diff] [blame] | 3409 | } |
| 3410 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3411 | static int selinux_task_setnice(struct task_struct *p, int nice) |
| 3412 | { |
| 3413 | int rc; |
| 3414 | |
Eric Paris | 200ac53 | 2009-02-12 15:01:04 -0500 | [diff] [blame] | 3415 | rc = cap_task_setnice(p, nice); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3416 | if (rc) |
| 3417 | return rc; |
| 3418 | |
David Howells | 3b11a1d | 2008-11-14 10:39:26 +1100 | [diff] [blame] | 3419 | return current_has_perm(p, PROCESS__SETSCHED); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3420 | } |
| 3421 | |
James Morris | 03e6806 | 2006-06-23 02:03:58 -0700 | [diff] [blame] | 3422 | static int selinux_task_setioprio(struct task_struct *p, int ioprio) |
| 3423 | { |
Serge E. Hallyn | b537677 | 2007-10-16 23:31:36 -0700 | [diff] [blame] | 3424 | int rc; |
| 3425 | |
Eric Paris | 200ac53 | 2009-02-12 15:01:04 -0500 | [diff] [blame] | 3426 | rc = cap_task_setioprio(p, ioprio); |
Serge E. Hallyn | b537677 | 2007-10-16 23:31:36 -0700 | [diff] [blame] | 3427 | if (rc) |
| 3428 | return rc; |
| 3429 | |
David Howells | 3b11a1d | 2008-11-14 10:39:26 +1100 | [diff] [blame] | 3430 | return current_has_perm(p, PROCESS__SETSCHED); |
James Morris | 03e6806 | 2006-06-23 02:03:58 -0700 | [diff] [blame] | 3431 | } |
| 3432 | |
David Quigley | a1836a4 | 2006-06-30 01:55:49 -0700 | [diff] [blame] | 3433 | static int selinux_task_getioprio(struct task_struct *p) |
| 3434 | { |
David Howells | 3b11a1d | 2008-11-14 10:39:26 +1100 | [diff] [blame] | 3435 | return current_has_perm(p, PROCESS__GETSCHED); |
David Quigley | a1836a4 | 2006-06-30 01:55:49 -0700 | [diff] [blame] | 3436 | } |
| 3437 | |
Jiri Slaby | 8fd00b4 | 2009-08-26 18:41:16 +0200 | [diff] [blame] | 3438 | static int selinux_task_setrlimit(struct task_struct *p, unsigned int resource, |
| 3439 | struct rlimit *new_rlim) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3440 | { |
Jiri Slaby | 8fd00b4 | 2009-08-26 18:41:16 +0200 | [diff] [blame] | 3441 | struct rlimit *old_rlim = p->signal->rlim + resource; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3442 | |
| 3443 | /* Control the ability to change the hard limit (whether |
| 3444 | lowering or raising it), so that the hard limit can |
| 3445 | later be used as a safe reset point for the soft limit |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 3446 | upon context transitions. See selinux_bprm_committing_creds. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3447 | if (old_rlim->rlim_max != new_rlim->rlim_max) |
Jiri Slaby | 8fd00b4 | 2009-08-26 18:41:16 +0200 | [diff] [blame] | 3448 | return current_has_perm(p, PROCESS__SETRLIMIT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3449 | |
| 3450 | return 0; |
| 3451 | } |
| 3452 | |
KOSAKI Motohiro | b0ae198 | 2010-10-15 04:21:18 +0900 | [diff] [blame] | 3453 | static int selinux_task_setscheduler(struct task_struct *p) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3454 | { |
Serge E. Hallyn | b537677 | 2007-10-16 23:31:36 -0700 | [diff] [blame] | 3455 | int rc; |
| 3456 | |
KOSAKI Motohiro | b0ae198 | 2010-10-15 04:21:18 +0900 | [diff] [blame] | 3457 | rc = cap_task_setscheduler(p); |
Serge E. Hallyn | b537677 | 2007-10-16 23:31:36 -0700 | [diff] [blame] | 3458 | if (rc) |
| 3459 | return rc; |
| 3460 | |
David Howells | 3b11a1d | 2008-11-14 10:39:26 +1100 | [diff] [blame] | 3461 | return current_has_perm(p, PROCESS__SETSCHED); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3462 | } |
| 3463 | |
| 3464 | static int selinux_task_getscheduler(struct task_struct *p) |
| 3465 | { |
David Howells | 3b11a1d | 2008-11-14 10:39:26 +1100 | [diff] [blame] | 3466 | return current_has_perm(p, PROCESS__GETSCHED); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3467 | } |
| 3468 | |
David Quigley | 3560154 | 2006-06-23 02:04:01 -0700 | [diff] [blame] | 3469 | static int selinux_task_movememory(struct task_struct *p) |
| 3470 | { |
David Howells | 3b11a1d | 2008-11-14 10:39:26 +1100 | [diff] [blame] | 3471 | return current_has_perm(p, PROCESS__SETSCHED); |
David Quigley | 3560154 | 2006-06-23 02:04:01 -0700 | [diff] [blame] | 3472 | } |
| 3473 | |
David Quigley | f9008e4 | 2006-06-30 01:55:46 -0700 | [diff] [blame] | 3474 | static int selinux_task_kill(struct task_struct *p, struct siginfo *info, |
| 3475 | int sig, u32 secid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3476 | { |
| 3477 | u32 perm; |
| 3478 | int rc; |
| 3479 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3480 | if (!sig) |
| 3481 | perm = PROCESS__SIGNULL; /* null signal; existence test */ |
| 3482 | else |
| 3483 | perm = signal_to_av(sig); |
David Quigley | f9008e4 | 2006-06-30 01:55:46 -0700 | [diff] [blame] | 3484 | if (secid) |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 3485 | rc = avc_has_perm(secid, task_sid(p), |
| 3486 | SECCLASS_PROCESS, perm, NULL); |
David Quigley | f9008e4 | 2006-06-30 01:55:46 -0700 | [diff] [blame] | 3487 | else |
David Howells | 3b11a1d | 2008-11-14 10:39:26 +1100 | [diff] [blame] | 3488 | rc = current_has_perm(p, perm); |
David Quigley | f9008e4 | 2006-06-30 01:55:46 -0700 | [diff] [blame] | 3489 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3490 | } |
| 3491 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3492 | static int selinux_task_wait(struct task_struct *p) |
| 3493 | { |
Eric Paris | 8a53514 | 2007-10-22 16:10:31 -0400 | [diff] [blame] | 3494 | return task_has_perm(p, current, PROCESS__SIGCHLD); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3495 | } |
| 3496 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3497 | static void selinux_task_to_inode(struct task_struct *p, |
| 3498 | struct inode *inode) |
| 3499 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3500 | struct inode_security_struct *isec = inode->i_security; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 3501 | u32 sid = task_sid(p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3502 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 3503 | isec->sid = sid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3504 | isec->initialized = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3505 | } |
| 3506 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3507 | /* Returns error only if unable to parse addresses */ |
Venkat Yekkirala | 67f83cb | 2006-11-08 17:04:26 -0600 | [diff] [blame] | 3508 | static int selinux_parse_skb_ipv4(struct sk_buff *skb, |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 3509 | struct common_audit_data *ad, u8 *proto) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3510 | { |
| 3511 | int offset, ihlen, ret = -EINVAL; |
| 3512 | struct iphdr _iph, *ih; |
| 3513 | |
Arnaldo Carvalho de Melo | bbe735e | 2007-03-10 22:16:10 -0300 | [diff] [blame] | 3514 | offset = skb_network_offset(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3515 | ih = skb_header_pointer(skb, offset, sizeof(_iph), &_iph); |
| 3516 | if (ih == NULL) |
| 3517 | goto out; |
| 3518 | |
| 3519 | ihlen = ih->ihl * 4; |
| 3520 | if (ihlen < sizeof(_iph)) |
| 3521 | goto out; |
| 3522 | |
Eric Paris | 48c62af | 2012-04-02 13:15:44 -0400 | [diff] [blame] | 3523 | ad->u.net->v4info.saddr = ih->saddr; |
| 3524 | ad->u.net->v4info.daddr = ih->daddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3525 | ret = 0; |
| 3526 | |
Venkat Yekkirala | 67f83cb | 2006-11-08 17:04:26 -0600 | [diff] [blame] | 3527 | if (proto) |
| 3528 | *proto = ih->protocol; |
| 3529 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3530 | switch (ih->protocol) { |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3531 | case IPPROTO_TCP: { |
| 3532 | struct tcphdr _tcph, *th; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3533 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3534 | if (ntohs(ih->frag_off) & IP_OFFSET) |
| 3535 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3536 | |
| 3537 | offset += ihlen; |
| 3538 | th = skb_header_pointer(skb, offset, sizeof(_tcph), &_tcph); |
| 3539 | if (th == NULL) |
| 3540 | break; |
| 3541 | |
Eric Paris | 48c62af | 2012-04-02 13:15:44 -0400 | [diff] [blame] | 3542 | ad->u.net->sport = th->source; |
| 3543 | ad->u.net->dport = th->dest; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3544 | break; |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3545 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3546 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3547 | case IPPROTO_UDP: { |
| 3548 | struct udphdr _udph, *uh; |
| 3549 | |
| 3550 | if (ntohs(ih->frag_off) & IP_OFFSET) |
| 3551 | break; |
| 3552 | |
| 3553 | offset += ihlen; |
| 3554 | uh = skb_header_pointer(skb, offset, sizeof(_udph), &_udph); |
| 3555 | if (uh == NULL) |
| 3556 | break; |
| 3557 | |
Eric Paris | 48c62af | 2012-04-02 13:15:44 -0400 | [diff] [blame] | 3558 | ad->u.net->sport = uh->source; |
| 3559 | ad->u.net->dport = uh->dest; |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3560 | break; |
| 3561 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3562 | |
James Morris | 2ee92d4 | 2006-11-13 16:09:01 -0800 | [diff] [blame] | 3563 | case IPPROTO_DCCP: { |
| 3564 | struct dccp_hdr _dccph, *dh; |
| 3565 | |
| 3566 | if (ntohs(ih->frag_off) & IP_OFFSET) |
| 3567 | break; |
| 3568 | |
| 3569 | offset += ihlen; |
| 3570 | dh = skb_header_pointer(skb, offset, sizeof(_dccph), &_dccph); |
| 3571 | if (dh == NULL) |
| 3572 | break; |
| 3573 | |
Eric Paris | 48c62af | 2012-04-02 13:15:44 -0400 | [diff] [blame] | 3574 | ad->u.net->sport = dh->dccph_sport; |
| 3575 | ad->u.net->dport = dh->dccph_dport; |
James Morris | 2ee92d4 | 2006-11-13 16:09:01 -0800 | [diff] [blame] | 3576 | break; |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3577 | } |
James Morris | 2ee92d4 | 2006-11-13 16:09:01 -0800 | [diff] [blame] | 3578 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3579 | default: |
| 3580 | break; |
| 3581 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3582 | out: |
| 3583 | return ret; |
| 3584 | } |
| 3585 | |
| 3586 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
| 3587 | |
| 3588 | /* Returns error only if unable to parse addresses */ |
Venkat Yekkirala | 67f83cb | 2006-11-08 17:04:26 -0600 | [diff] [blame] | 3589 | static int selinux_parse_skb_ipv6(struct sk_buff *skb, |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 3590 | struct common_audit_data *ad, u8 *proto) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3591 | { |
| 3592 | u8 nexthdr; |
| 3593 | int ret = -EINVAL, offset; |
| 3594 | struct ipv6hdr _ipv6h, *ip6; |
Jesse Gross | 75f2811 | 2011-11-30 17:05:51 -0800 | [diff] [blame] | 3595 | __be16 frag_off; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3596 | |
Arnaldo Carvalho de Melo | bbe735e | 2007-03-10 22:16:10 -0300 | [diff] [blame] | 3597 | offset = skb_network_offset(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3598 | ip6 = skb_header_pointer(skb, offset, sizeof(_ipv6h), &_ipv6h); |
| 3599 | if (ip6 == NULL) |
| 3600 | goto out; |
| 3601 | |
Eric Paris | 48c62af | 2012-04-02 13:15:44 -0400 | [diff] [blame] | 3602 | ad->u.net->v6info.saddr = ip6->saddr; |
| 3603 | ad->u.net->v6info.daddr = ip6->daddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3604 | ret = 0; |
| 3605 | |
| 3606 | nexthdr = ip6->nexthdr; |
| 3607 | offset += sizeof(_ipv6h); |
Jesse Gross | 75f2811 | 2011-11-30 17:05:51 -0800 | [diff] [blame] | 3608 | offset = ipv6_skip_exthdr(skb, offset, &nexthdr, &frag_off); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3609 | if (offset < 0) |
| 3610 | goto out; |
| 3611 | |
Venkat Yekkirala | 67f83cb | 2006-11-08 17:04:26 -0600 | [diff] [blame] | 3612 | if (proto) |
| 3613 | *proto = nexthdr; |
| 3614 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3615 | switch (nexthdr) { |
| 3616 | case IPPROTO_TCP: { |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3617 | struct tcphdr _tcph, *th; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3618 | |
| 3619 | th = skb_header_pointer(skb, offset, sizeof(_tcph), &_tcph); |
| 3620 | if (th == NULL) |
| 3621 | break; |
| 3622 | |
Eric Paris | 48c62af | 2012-04-02 13:15:44 -0400 | [diff] [blame] | 3623 | ad->u.net->sport = th->source; |
| 3624 | ad->u.net->dport = th->dest; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3625 | break; |
| 3626 | } |
| 3627 | |
| 3628 | case IPPROTO_UDP: { |
| 3629 | struct udphdr _udph, *uh; |
| 3630 | |
| 3631 | uh = skb_header_pointer(skb, offset, sizeof(_udph), &_udph); |
| 3632 | if (uh == NULL) |
| 3633 | break; |
| 3634 | |
Eric Paris | 48c62af | 2012-04-02 13:15:44 -0400 | [diff] [blame] | 3635 | ad->u.net->sport = uh->source; |
| 3636 | ad->u.net->dport = uh->dest; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3637 | break; |
| 3638 | } |
| 3639 | |
James Morris | 2ee92d4 | 2006-11-13 16:09:01 -0800 | [diff] [blame] | 3640 | case IPPROTO_DCCP: { |
| 3641 | struct dccp_hdr _dccph, *dh; |
| 3642 | |
| 3643 | dh = skb_header_pointer(skb, offset, sizeof(_dccph), &_dccph); |
| 3644 | if (dh == NULL) |
| 3645 | break; |
| 3646 | |
Eric Paris | 48c62af | 2012-04-02 13:15:44 -0400 | [diff] [blame] | 3647 | ad->u.net->sport = dh->dccph_sport; |
| 3648 | ad->u.net->dport = dh->dccph_dport; |
James Morris | 2ee92d4 | 2006-11-13 16:09:01 -0800 | [diff] [blame] | 3649 | break; |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3650 | } |
James Morris | 2ee92d4 | 2006-11-13 16:09:01 -0800 | [diff] [blame] | 3651 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3652 | /* includes fragments */ |
| 3653 | default: |
| 3654 | break; |
| 3655 | } |
| 3656 | out: |
| 3657 | return ret; |
| 3658 | } |
| 3659 | |
| 3660 | #endif /* IPV6 */ |
| 3661 | |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 3662 | 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] | 3663 | char **_addrp, int src, u8 *proto) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3664 | { |
David Howells | cf9481e | 2008-07-27 21:31:07 +1000 | [diff] [blame] | 3665 | char *addrp; |
| 3666 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3667 | |
Eric Paris | 48c62af | 2012-04-02 13:15:44 -0400 | [diff] [blame] | 3668 | switch (ad->u.net->family) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3669 | case PF_INET: |
Venkat Yekkirala | 67f83cb | 2006-11-08 17:04:26 -0600 | [diff] [blame] | 3670 | ret = selinux_parse_skb_ipv4(skb, ad, proto); |
David Howells | cf9481e | 2008-07-27 21:31:07 +1000 | [diff] [blame] | 3671 | if (ret) |
| 3672 | goto parse_error; |
Eric Paris | 48c62af | 2012-04-02 13:15:44 -0400 | [diff] [blame] | 3673 | addrp = (char *)(src ? &ad->u.net->v4info.saddr : |
| 3674 | &ad->u.net->v4info.daddr); |
David Howells | cf9481e | 2008-07-27 21:31:07 +1000 | [diff] [blame] | 3675 | goto okay; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3676 | |
| 3677 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
| 3678 | case PF_INET6: |
Venkat Yekkirala | 67f83cb | 2006-11-08 17:04:26 -0600 | [diff] [blame] | 3679 | ret = selinux_parse_skb_ipv6(skb, ad, proto); |
David Howells | cf9481e | 2008-07-27 21:31:07 +1000 | [diff] [blame] | 3680 | if (ret) |
| 3681 | goto parse_error; |
Eric Paris | 48c62af | 2012-04-02 13:15:44 -0400 | [diff] [blame] | 3682 | addrp = (char *)(src ? &ad->u.net->v6info.saddr : |
| 3683 | &ad->u.net->v6info.daddr); |
David Howells | cf9481e | 2008-07-27 21:31:07 +1000 | [diff] [blame] | 3684 | goto okay; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3685 | #endif /* IPV6 */ |
| 3686 | default: |
David Howells | cf9481e | 2008-07-27 21:31:07 +1000 | [diff] [blame] | 3687 | addrp = NULL; |
| 3688 | goto okay; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3689 | } |
| 3690 | |
David Howells | cf9481e | 2008-07-27 21:31:07 +1000 | [diff] [blame] | 3691 | parse_error: |
| 3692 | printk(KERN_WARNING |
| 3693 | "SELinux: failure in selinux_parse_skb()," |
| 3694 | " unable to parse packet\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3695 | return ret; |
David Howells | cf9481e | 2008-07-27 21:31:07 +1000 | [diff] [blame] | 3696 | |
| 3697 | okay: |
| 3698 | if (_addrp) |
| 3699 | *_addrp = addrp; |
| 3700 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3701 | } |
| 3702 | |
Paul Moore | 4f6a993 | 2007-03-01 14:35:22 -0500 | [diff] [blame] | 3703 | /** |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 3704 | * selinux_skb_peerlbl_sid - Determine the peer label of a packet |
Paul Moore | 4f6a993 | 2007-03-01 14:35:22 -0500 | [diff] [blame] | 3705 | * @skb: the packet |
Paul Moore | 75e2291 | 2008-01-29 08:38:04 -0500 | [diff] [blame] | 3706 | * @family: protocol family |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 3707 | * @sid: the packet's peer label SID |
Paul Moore | 4f6a993 | 2007-03-01 14:35:22 -0500 | [diff] [blame] | 3708 | * |
| 3709 | * Description: |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 3710 | * Check the various different forms of network peer labeling and determine |
| 3711 | * the peer label/SID for the packet; most of the magic actually occurs in |
| 3712 | * the security server function security_net_peersid_cmp(). The function |
| 3713 | * returns zero if the value in @sid is valid (although it may be SECSID_NULL) |
| 3714 | * or -EACCES if @sid is invalid due to inconsistencies with the different |
| 3715 | * peer labels. |
Paul Moore | 4f6a993 | 2007-03-01 14:35:22 -0500 | [diff] [blame] | 3716 | * |
| 3717 | */ |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 3718 | 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] | 3719 | { |
Paul Moore | 71f1cb0 | 2008-01-29 08:51:16 -0500 | [diff] [blame] | 3720 | int err; |
Paul Moore | 4f6a993 | 2007-03-01 14:35:22 -0500 | [diff] [blame] | 3721 | u32 xfrm_sid; |
| 3722 | u32 nlbl_sid; |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 3723 | u32 nlbl_type; |
Paul Moore | 4f6a993 | 2007-03-01 14:35:22 -0500 | [diff] [blame] | 3724 | |
| 3725 | selinux_skb_xfrm_sid(skb, &xfrm_sid); |
Paul Moore | 5dbe1eb | 2008-01-29 08:44:18 -0500 | [diff] [blame] | 3726 | selinux_netlbl_skbuff_getsid(skb, family, &nlbl_type, &nlbl_sid); |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 3727 | |
Paul Moore | 71f1cb0 | 2008-01-29 08:51:16 -0500 | [diff] [blame] | 3728 | err = security_net_peersid_resolve(nlbl_sid, nlbl_type, xfrm_sid, sid); |
| 3729 | if (unlikely(err)) { |
| 3730 | printk(KERN_WARNING |
| 3731 | "SELinux: failure in selinux_skb_peerlbl_sid()," |
| 3732 | " unable to determine packet's peer label\n"); |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 3733 | return -EACCES; |
Paul Moore | 71f1cb0 | 2008-01-29 08:51:16 -0500 | [diff] [blame] | 3734 | } |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 3735 | |
| 3736 | return 0; |
Paul Moore | 4f6a993 | 2007-03-01 14:35:22 -0500 | [diff] [blame] | 3737 | } |
| 3738 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3739 | /* socket security operations */ |
Paul Moore | d4f2d97 | 2010-04-22 14:46:18 -0400 | [diff] [blame] | 3740 | |
Harry Ciao | 2ad18bd | 2011-03-02 13:32:34 +0800 | [diff] [blame] | 3741 | static int socket_sockcreate_sid(const struct task_security_struct *tsec, |
| 3742 | u16 secclass, u32 *socksid) |
Paul Moore | d4f2d97 | 2010-04-22 14:46:18 -0400 | [diff] [blame] | 3743 | { |
Harry Ciao | 2ad18bd | 2011-03-02 13:32:34 +0800 | [diff] [blame] | 3744 | if (tsec->sockcreate_sid > SECSID_NULL) { |
| 3745 | *socksid = tsec->sockcreate_sid; |
| 3746 | return 0; |
| 3747 | } |
| 3748 | |
| 3749 | return security_transition_sid(tsec->sid, tsec->sid, secclass, NULL, |
| 3750 | socksid); |
Paul Moore | d4f2d97 | 2010-04-22 14:46:18 -0400 | [diff] [blame] | 3751 | } |
| 3752 | |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 3753 | 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] | 3754 | { |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 3755 | struct sk_security_struct *sksec = sk->sk_security; |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 3756 | struct common_audit_data ad; |
Eric Paris | 48c62af | 2012-04-02 13:15:44 -0400 | [diff] [blame] | 3757 | struct lsm_network_audit net = {0,}; |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 3758 | u32 tsid = task_sid(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3759 | |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 3760 | if (sksec->sid == SECINITSID_KERNEL) |
| 3761 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3762 | |
Eric Paris | 50c205f | 2012-04-04 15:01:43 -0400 | [diff] [blame] | 3763 | ad.type = LSM_AUDIT_DATA_NET; |
Eric Paris | 48c62af | 2012-04-02 13:15:44 -0400 | [diff] [blame] | 3764 | ad.u.net = &net; |
| 3765 | ad.u.net->sk = sk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3766 | |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 3767 | return avc_has_perm(tsid, sksec->sid, sksec->sclass, perms, &ad); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3768 | } |
| 3769 | |
| 3770 | static int selinux_socket_create(int family, int type, |
| 3771 | int protocol, int kern) |
| 3772 | { |
Paul Moore | 5fb4987 | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 3773 | const struct task_security_struct *tsec = current_security(); |
Paul Moore | d4f2d97 | 2010-04-22 14:46:18 -0400 | [diff] [blame] | 3774 | u32 newsid; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 3775 | u16 secclass; |
Harry Ciao | 2ad18bd | 2011-03-02 13:32:34 +0800 | [diff] [blame] | 3776 | int rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3777 | |
| 3778 | if (kern) |
Paul Moore | d4f2d97 | 2010-04-22 14:46:18 -0400 | [diff] [blame] | 3779 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3780 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 3781 | secclass = socket_type_to_security_class(family, type, protocol); |
Harry Ciao | 2ad18bd | 2011-03-02 13:32:34 +0800 | [diff] [blame] | 3782 | rc = socket_sockcreate_sid(tsec, secclass, &newsid); |
| 3783 | if (rc) |
| 3784 | return rc; |
| 3785 | |
Paul Moore | d4f2d97 | 2010-04-22 14:46:18 -0400 | [diff] [blame] | 3786 | return avc_has_perm(tsec->sid, newsid, secclass, SOCKET__CREATE, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3787 | } |
| 3788 | |
Venkat Yekkirala | 7420ed2 | 2006-08-04 23:17:57 -0700 | [diff] [blame] | 3789 | static int selinux_socket_post_create(struct socket *sock, int family, |
| 3790 | int type, int protocol, int kern) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3791 | { |
Paul Moore | 5fb4987 | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 3792 | const struct task_security_struct *tsec = current_security(); |
Paul Moore | d4f2d97 | 2010-04-22 14:46:18 -0400 | [diff] [blame] | 3793 | struct inode_security_struct *isec = SOCK_INODE(sock)->i_security; |
Venkat Yekkirala | 892c141 | 2006-08-04 23:08:56 -0700 | [diff] [blame] | 3794 | struct sk_security_struct *sksec; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 3795 | int err = 0; |
| 3796 | |
Harry Ciao | 2ad18bd | 2011-03-02 13:32:34 +0800 | [diff] [blame] | 3797 | isec->sclass = socket_type_to_security_class(family, type, protocol); |
| 3798 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 3799 | if (kern) |
| 3800 | isec->sid = SECINITSID_KERNEL; |
Harry Ciao | 2ad18bd | 2011-03-02 13:32:34 +0800 | [diff] [blame] | 3801 | else { |
| 3802 | err = socket_sockcreate_sid(tsec, isec->sclass, &(isec->sid)); |
| 3803 | if (err) |
| 3804 | return err; |
| 3805 | } |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 3806 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3807 | isec->initialized = 1; |
| 3808 | |
Venkat Yekkirala | 892c141 | 2006-08-04 23:08:56 -0700 | [diff] [blame] | 3809 | if (sock->sk) { |
| 3810 | sksec = sock->sk->sk_security; |
| 3811 | sksec->sid = isec->sid; |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 3812 | sksec->sclass = isec->sclass; |
Paul Moore | 389fb800 | 2009-03-27 17:10:34 -0400 | [diff] [blame] | 3813 | err = selinux_netlbl_socket_post_create(sock->sk, family); |
Venkat Yekkirala | 892c141 | 2006-08-04 23:08:56 -0700 | [diff] [blame] | 3814 | } |
| 3815 | |
Venkat Yekkirala | 7420ed2 | 2006-08-04 23:17:57 -0700 | [diff] [blame] | 3816 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3817 | } |
| 3818 | |
| 3819 | /* Range of port numbers used to automatically bind. |
| 3820 | Need to determine whether we should perform a name_bind |
| 3821 | permission check between the socket and the port number. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3822 | |
| 3823 | static int selinux_socket_bind(struct socket *sock, struct sockaddr *address, int addrlen) |
| 3824 | { |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 3825 | struct sock *sk = sock->sk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3826 | u16 family; |
| 3827 | int err; |
| 3828 | |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 3829 | err = sock_has_perm(current, sk, SOCKET__BIND); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3830 | if (err) |
| 3831 | goto out; |
| 3832 | |
| 3833 | /* |
| 3834 | * 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] | 3835 | * Multiple address binding for SCTP is not supported yet: we just |
| 3836 | * check the first address now. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3837 | */ |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 3838 | family = sk->sk_family; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3839 | if (family == PF_INET || family == PF_INET6) { |
| 3840 | char *addrp; |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 3841 | struct sk_security_struct *sksec = sk->sk_security; |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 3842 | struct common_audit_data ad; |
Eric Paris | 48c62af | 2012-04-02 13:15:44 -0400 | [diff] [blame] | 3843 | struct lsm_network_audit net = {0,}; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3844 | struct sockaddr_in *addr4 = NULL; |
| 3845 | struct sockaddr_in6 *addr6 = NULL; |
| 3846 | unsigned short snum; |
James Morris | e399f98 | 2008-06-12 01:39:58 +1000 | [diff] [blame] | 3847 | u32 sid, node_perm; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3848 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3849 | if (family == PF_INET) { |
| 3850 | addr4 = (struct sockaddr_in *)address; |
| 3851 | snum = ntohs(addr4->sin_port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3852 | addrp = (char *)&addr4->sin_addr.s_addr; |
| 3853 | } else { |
| 3854 | addr6 = (struct sockaddr_in6 *)address; |
| 3855 | snum = ntohs(addr6->sin6_port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3856 | addrp = (char *)&addr6->sin6_addr.s6_addr; |
| 3857 | } |
| 3858 | |
Stephen Hemminger | 227b60f | 2007-10-10 17:30:46 -0700 | [diff] [blame] | 3859 | if (snum) { |
| 3860 | int low, high; |
| 3861 | |
| 3862 | inet_get_local_port_range(&low, &high); |
| 3863 | |
| 3864 | if (snum < max(PROT_SOCK, low) || snum > high) { |
Paul Moore | 3e11217 | 2008-04-10 10:48:14 -0400 | [diff] [blame] | 3865 | err = sel_netport_sid(sk->sk_protocol, |
| 3866 | snum, &sid); |
Stephen Hemminger | 227b60f | 2007-10-10 17:30:46 -0700 | [diff] [blame] | 3867 | if (err) |
| 3868 | goto out; |
Eric Paris | 50c205f | 2012-04-04 15:01:43 -0400 | [diff] [blame] | 3869 | ad.type = LSM_AUDIT_DATA_NET; |
Eric Paris | 48c62af | 2012-04-02 13:15:44 -0400 | [diff] [blame] | 3870 | ad.u.net = &net; |
| 3871 | ad.u.net->sport = htons(snum); |
| 3872 | ad.u.net->family = family; |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 3873 | err = avc_has_perm(sksec->sid, sid, |
| 3874 | sksec->sclass, |
Stephen Hemminger | 227b60f | 2007-10-10 17:30:46 -0700 | [diff] [blame] | 3875 | SOCKET__NAME_BIND, &ad); |
| 3876 | if (err) |
| 3877 | goto out; |
| 3878 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3879 | } |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3880 | |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 3881 | switch (sksec->sclass) { |
James Morris | 1340258 | 2005-09-30 14:24:34 -0400 | [diff] [blame] | 3882 | case SECCLASS_TCP_SOCKET: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3883 | node_perm = TCP_SOCKET__NODE_BIND; |
| 3884 | break; |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3885 | |
James Morris | 1340258 | 2005-09-30 14:24:34 -0400 | [diff] [blame] | 3886 | case SECCLASS_UDP_SOCKET: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3887 | node_perm = UDP_SOCKET__NODE_BIND; |
| 3888 | break; |
James Morris | 2ee92d4 | 2006-11-13 16:09:01 -0800 | [diff] [blame] | 3889 | |
| 3890 | case SECCLASS_DCCP_SOCKET: |
| 3891 | node_perm = DCCP_SOCKET__NODE_BIND; |
| 3892 | break; |
| 3893 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3894 | default: |
| 3895 | node_perm = RAWIP_SOCKET__NODE_BIND; |
| 3896 | break; |
| 3897 | } |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3898 | |
Paul Moore | 224dfbd | 2008-01-29 08:38:13 -0500 | [diff] [blame] | 3899 | err = sel_netnode_sid(addrp, family, &sid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3900 | if (err) |
| 3901 | goto out; |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3902 | |
Eric Paris | 50c205f | 2012-04-04 15:01:43 -0400 | [diff] [blame] | 3903 | ad.type = LSM_AUDIT_DATA_NET; |
Eric Paris | 48c62af | 2012-04-02 13:15:44 -0400 | [diff] [blame] | 3904 | ad.u.net = &net; |
| 3905 | ad.u.net->sport = htons(snum); |
| 3906 | ad.u.net->family = family; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3907 | |
| 3908 | if (family == PF_INET) |
Eric Paris | 48c62af | 2012-04-02 13:15:44 -0400 | [diff] [blame] | 3909 | ad.u.net->v4info.saddr = addr4->sin_addr.s_addr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3910 | else |
Eric Paris | 48c62af | 2012-04-02 13:15:44 -0400 | [diff] [blame] | 3911 | ad.u.net->v6info.saddr = addr6->sin6_addr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3912 | |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 3913 | err = avc_has_perm(sksec->sid, sid, |
| 3914 | sksec->sclass, node_perm, &ad); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3915 | if (err) |
| 3916 | goto out; |
| 3917 | } |
| 3918 | out: |
| 3919 | return err; |
| 3920 | } |
| 3921 | |
| 3922 | static int selinux_socket_connect(struct socket *sock, struct sockaddr *address, int addrlen) |
| 3923 | { |
Paul Moore | 014ab19 | 2008-10-10 10:16:33 -0400 | [diff] [blame] | 3924 | struct sock *sk = sock->sk; |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 3925 | struct sk_security_struct *sksec = sk->sk_security; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3926 | int err; |
| 3927 | |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 3928 | err = sock_has_perm(current, sk, SOCKET__CONNECT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3929 | if (err) |
| 3930 | return err; |
| 3931 | |
| 3932 | /* |
James Morris | 2ee92d4 | 2006-11-13 16:09:01 -0800 | [diff] [blame] | 3933 | * 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] | 3934 | */ |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 3935 | if (sksec->sclass == SECCLASS_TCP_SOCKET || |
| 3936 | sksec->sclass == SECCLASS_DCCP_SOCKET) { |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 3937 | struct common_audit_data ad; |
Eric Paris | 48c62af | 2012-04-02 13:15:44 -0400 | [diff] [blame] | 3938 | struct lsm_network_audit net = {0,}; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3939 | struct sockaddr_in *addr4 = NULL; |
| 3940 | struct sockaddr_in6 *addr6 = NULL; |
| 3941 | unsigned short snum; |
James Morris | 2ee92d4 | 2006-11-13 16:09:01 -0800 | [diff] [blame] | 3942 | u32 sid, perm; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3943 | |
| 3944 | if (sk->sk_family == PF_INET) { |
| 3945 | addr4 = (struct sockaddr_in *)address; |
Stephen Smalley | 911656f | 2005-07-28 21:16:21 -0700 | [diff] [blame] | 3946 | if (addrlen < sizeof(struct sockaddr_in)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3947 | return -EINVAL; |
| 3948 | snum = ntohs(addr4->sin_port); |
| 3949 | } else { |
| 3950 | addr6 = (struct sockaddr_in6 *)address; |
Stephen Smalley | 911656f | 2005-07-28 21:16:21 -0700 | [diff] [blame] | 3951 | if (addrlen < SIN6_LEN_RFC2133) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3952 | return -EINVAL; |
| 3953 | snum = ntohs(addr6->sin6_port); |
| 3954 | } |
| 3955 | |
Paul Moore | 3e11217 | 2008-04-10 10:48:14 -0400 | [diff] [blame] | 3956 | err = sel_netport_sid(sk->sk_protocol, snum, &sid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3957 | if (err) |
| 3958 | goto out; |
| 3959 | |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 3960 | perm = (sksec->sclass == SECCLASS_TCP_SOCKET) ? |
James Morris | 2ee92d4 | 2006-11-13 16:09:01 -0800 | [diff] [blame] | 3961 | TCP_SOCKET__NAME_CONNECT : DCCP_SOCKET__NAME_CONNECT; |
| 3962 | |
Eric Paris | 50c205f | 2012-04-04 15:01:43 -0400 | [diff] [blame] | 3963 | ad.type = LSM_AUDIT_DATA_NET; |
Eric Paris | 48c62af | 2012-04-02 13:15:44 -0400 | [diff] [blame] | 3964 | ad.u.net = &net; |
| 3965 | ad.u.net->dport = htons(snum); |
| 3966 | ad.u.net->family = sk->sk_family; |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 3967 | err = avc_has_perm(sksec->sid, sid, sksec->sclass, perm, &ad); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3968 | if (err) |
| 3969 | goto out; |
| 3970 | } |
| 3971 | |
Paul Moore | 014ab19 | 2008-10-10 10:16:33 -0400 | [diff] [blame] | 3972 | err = selinux_netlbl_socket_connect(sk, address); |
| 3973 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3974 | out: |
| 3975 | return err; |
| 3976 | } |
| 3977 | |
| 3978 | static int selinux_socket_listen(struct socket *sock, int backlog) |
| 3979 | { |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 3980 | return sock_has_perm(current, sock->sk, SOCKET__LISTEN); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3981 | } |
| 3982 | |
| 3983 | static int selinux_socket_accept(struct socket *sock, struct socket *newsock) |
| 3984 | { |
| 3985 | int err; |
| 3986 | struct inode_security_struct *isec; |
| 3987 | struct inode_security_struct *newisec; |
| 3988 | |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 3989 | err = sock_has_perm(current, sock->sk, SOCKET__ACCEPT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3990 | if (err) |
| 3991 | return err; |
| 3992 | |
| 3993 | newisec = SOCK_INODE(newsock)->i_security; |
| 3994 | |
| 3995 | isec = SOCK_INODE(sock)->i_security; |
| 3996 | newisec->sclass = isec->sclass; |
| 3997 | newisec->sid = isec->sid; |
| 3998 | newisec->initialized = 1; |
| 3999 | |
| 4000 | return 0; |
| 4001 | } |
| 4002 | |
| 4003 | static int selinux_socket_sendmsg(struct socket *sock, struct msghdr *msg, |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 4004 | int size) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4005 | { |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 4006 | return sock_has_perm(current, sock->sk, SOCKET__WRITE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4007 | } |
| 4008 | |
| 4009 | static int selinux_socket_recvmsg(struct socket *sock, struct msghdr *msg, |
| 4010 | int size, int flags) |
| 4011 | { |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 4012 | return sock_has_perm(current, sock->sk, SOCKET__READ); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4013 | } |
| 4014 | |
| 4015 | static int selinux_socket_getsockname(struct socket *sock) |
| 4016 | { |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 4017 | return sock_has_perm(current, sock->sk, SOCKET__GETATTR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4018 | } |
| 4019 | |
| 4020 | static int selinux_socket_getpeername(struct socket *sock) |
| 4021 | { |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 4022 | return sock_has_perm(current, sock->sk, SOCKET__GETATTR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4023 | } |
| 4024 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 4025 | static int selinux_socket_setsockopt(struct socket *sock, int level, int optname) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4026 | { |
Paul Moore | f8687af | 2006-10-30 15:22:15 -0800 | [diff] [blame] | 4027 | int err; |
| 4028 | |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 4029 | err = sock_has_perm(current, sock->sk, SOCKET__SETOPT); |
Paul Moore | f8687af | 2006-10-30 15:22:15 -0800 | [diff] [blame] | 4030 | if (err) |
| 4031 | return err; |
| 4032 | |
| 4033 | return selinux_netlbl_socket_setsockopt(sock, level, optname); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4034 | } |
| 4035 | |
| 4036 | static int selinux_socket_getsockopt(struct socket *sock, int level, |
| 4037 | int optname) |
| 4038 | { |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 4039 | return sock_has_perm(current, sock->sk, SOCKET__GETOPT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4040 | } |
| 4041 | |
| 4042 | static int selinux_socket_shutdown(struct socket *sock, int how) |
| 4043 | { |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 4044 | return sock_has_perm(current, sock->sk, SOCKET__SHUTDOWN); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4045 | } |
| 4046 | |
David S. Miller | 3610cda | 2011-01-05 15:38:53 -0800 | [diff] [blame] | 4047 | static int selinux_socket_unix_stream_connect(struct sock *sock, |
| 4048 | struct sock *other, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4049 | struct sock *newsk) |
| 4050 | { |
David S. Miller | 3610cda | 2011-01-05 15:38:53 -0800 | [diff] [blame] | 4051 | struct sk_security_struct *sksec_sock = sock->sk_security; |
| 4052 | struct sk_security_struct *sksec_other = other->sk_security; |
Paul Moore | 4d1e245 | 2010-04-22 14:46:18 -0400 | [diff] [blame] | 4053 | struct sk_security_struct *sksec_new = newsk->sk_security; |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 4054 | struct common_audit_data ad; |
Eric Paris | 48c62af | 2012-04-02 13:15:44 -0400 | [diff] [blame] | 4055 | struct lsm_network_audit net = {0,}; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4056 | int err; |
| 4057 | |
Eric Paris | 50c205f | 2012-04-04 15:01:43 -0400 | [diff] [blame] | 4058 | ad.type = LSM_AUDIT_DATA_NET; |
Eric Paris | 48c62af | 2012-04-02 13:15:44 -0400 | [diff] [blame] | 4059 | ad.u.net = &net; |
| 4060 | ad.u.net->sk = other; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4061 | |
Paul Moore | 4d1e245 | 2010-04-22 14:46:18 -0400 | [diff] [blame] | 4062 | err = avc_has_perm(sksec_sock->sid, sksec_other->sid, |
| 4063 | sksec_other->sclass, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4064 | UNIX_STREAM_SOCKET__CONNECTTO, &ad); |
| 4065 | if (err) |
| 4066 | return err; |
| 4067 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4068 | /* server child socket */ |
Paul Moore | 4d1e245 | 2010-04-22 14:46:18 -0400 | [diff] [blame] | 4069 | sksec_new->peer_sid = sksec_sock->sid; |
| 4070 | err = security_sid_mls_copy(sksec_other->sid, sksec_sock->sid, |
| 4071 | &sksec_new->sid); |
| 4072 | if (err) |
| 4073 | return err; |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 4074 | |
Paul Moore | 4d1e245 | 2010-04-22 14:46:18 -0400 | [diff] [blame] | 4075 | /* connecting socket */ |
| 4076 | sksec_sock->peer_sid = sksec_new->sid; |
| 4077 | |
| 4078 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4079 | } |
| 4080 | |
| 4081 | static int selinux_socket_unix_may_send(struct socket *sock, |
| 4082 | struct socket *other) |
| 4083 | { |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 4084 | struct sk_security_struct *ssec = sock->sk->sk_security; |
| 4085 | struct sk_security_struct *osec = other->sk->sk_security; |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 4086 | struct common_audit_data ad; |
Eric Paris | 48c62af | 2012-04-02 13:15:44 -0400 | [diff] [blame] | 4087 | struct lsm_network_audit net = {0,}; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4088 | |
Eric Paris | 50c205f | 2012-04-04 15:01:43 -0400 | [diff] [blame] | 4089 | ad.type = LSM_AUDIT_DATA_NET; |
Eric Paris | 48c62af | 2012-04-02 13:15:44 -0400 | [diff] [blame] | 4090 | ad.u.net = &net; |
| 4091 | ad.u.net->sk = other->sk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4092 | |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 4093 | return avc_has_perm(ssec->sid, osec->sid, osec->sclass, SOCKET__SENDTO, |
| 4094 | &ad); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4095 | } |
| 4096 | |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4097 | static int selinux_inet_sys_rcv_skb(int ifindex, char *addrp, u16 family, |
| 4098 | u32 peer_sid, |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 4099 | struct common_audit_data *ad) |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4100 | { |
| 4101 | int err; |
| 4102 | u32 if_sid; |
| 4103 | u32 node_sid; |
| 4104 | |
| 4105 | err = sel_netif_sid(ifindex, &if_sid); |
| 4106 | if (err) |
| 4107 | return err; |
| 4108 | err = avc_has_perm(peer_sid, if_sid, |
| 4109 | SECCLASS_NETIF, NETIF__INGRESS, ad); |
| 4110 | if (err) |
| 4111 | return err; |
| 4112 | |
| 4113 | err = sel_netnode_sid(addrp, family, &node_sid); |
| 4114 | if (err) |
| 4115 | return err; |
| 4116 | return avc_has_perm(peer_sid, node_sid, |
| 4117 | SECCLASS_NODE, NODE__RECVFROM, ad); |
| 4118 | } |
| 4119 | |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4120 | 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] | 4121 | u16 family) |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4122 | { |
Paul Moore | 277d342 | 2008-12-31 12:54:11 -0500 | [diff] [blame] | 4123 | int err = 0; |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4124 | struct sk_security_struct *sksec = sk->sk_security; |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4125 | u32 sk_sid = sksec->sid; |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 4126 | struct common_audit_data ad; |
Eric Paris | 48c62af | 2012-04-02 13:15:44 -0400 | [diff] [blame] | 4127 | struct lsm_network_audit net = {0,}; |
Paul Moore | d8395c8 | 2008-10-10 10:16:30 -0400 | [diff] [blame] | 4128 | char *addrp; |
| 4129 | |
Eric Paris | 50c205f | 2012-04-04 15:01:43 -0400 | [diff] [blame] | 4130 | ad.type = LSM_AUDIT_DATA_NET; |
Eric Paris | 48c62af | 2012-04-02 13:15:44 -0400 | [diff] [blame] | 4131 | ad.u.net = &net; |
| 4132 | ad.u.net->netif = skb->skb_iif; |
| 4133 | ad.u.net->family = family; |
Paul Moore | d8395c8 | 2008-10-10 10:16:30 -0400 | [diff] [blame] | 4134 | err = selinux_parse_skb(skb, &ad, &addrp, 1, NULL); |
| 4135 | if (err) |
| 4136 | return err; |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4137 | |
Paul Moore | 58bfbb5 | 2009-03-27 17:10:41 -0400 | [diff] [blame] | 4138 | if (selinux_secmark_enabled()) { |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4139 | err = avc_has_perm(sk_sid, skb->secmark, SECCLASS_PACKET, |
Paul Moore | d8395c8 | 2008-10-10 10:16:30 -0400 | [diff] [blame] | 4140 | PACKET__RECV, &ad); |
Paul Moore | 58bfbb5 | 2009-03-27 17:10:41 -0400 | [diff] [blame] | 4141 | if (err) |
| 4142 | return err; |
| 4143 | } |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4144 | |
Steffen Klassert | b9679a7 | 2011-02-23 12:55:21 +0100 | [diff] [blame] | 4145 | err = selinux_netlbl_sock_rcv_skb(sksec, skb, family, &ad); |
| 4146 | if (err) |
| 4147 | return err; |
| 4148 | err = selinux_xfrm_sock_rcv_skb(sksec->sid, skb, &ad); |
Trent Jaeger | d28d1e0 | 2005-12-13 23:12:40 -0800 | [diff] [blame] | 4149 | |
James Morris | 4e5ab4c | 2006-06-09 00:33:33 -0700 | [diff] [blame] | 4150 | return err; |
| 4151 | } |
Trent Jaeger | d28d1e0 | 2005-12-13 23:12:40 -0800 | [diff] [blame] | 4152 | |
James Morris | 4e5ab4c | 2006-06-09 00:33:33 -0700 | [diff] [blame] | 4153 | static int selinux_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb) |
| 4154 | { |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4155 | int err; |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 4156 | struct sk_security_struct *sksec = sk->sk_security; |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4157 | u16 family = sk->sk_family; |
| 4158 | u32 sk_sid = sksec->sid; |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 4159 | struct common_audit_data ad; |
Eric Paris | 48c62af | 2012-04-02 13:15:44 -0400 | [diff] [blame] | 4160 | struct lsm_network_audit net = {0,}; |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4161 | char *addrp; |
Paul Moore | d8395c8 | 2008-10-10 10:16:30 -0400 | [diff] [blame] | 4162 | u8 secmark_active; |
| 4163 | u8 peerlbl_active; |
James Morris | 4e5ab4c | 2006-06-09 00:33:33 -0700 | [diff] [blame] | 4164 | |
James Morris | 4e5ab4c | 2006-06-09 00:33:33 -0700 | [diff] [blame] | 4165 | if (family != PF_INET && family != PF_INET6) |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4166 | return 0; |
James Morris | 4e5ab4c | 2006-06-09 00:33:33 -0700 | [diff] [blame] | 4167 | |
| 4168 | /* Handle mapped IPv4 packets arriving via IPv6 sockets */ |
Al Viro | 87fcd70 | 2006-12-04 22:00:55 +0000 | [diff] [blame] | 4169 | if (family == PF_INET6 && skb->protocol == htons(ETH_P_IP)) |
James Morris | 4e5ab4c | 2006-06-09 00:33:33 -0700 | [diff] [blame] | 4170 | family = PF_INET; |
| 4171 | |
Paul Moore | d8395c8 | 2008-10-10 10:16:30 -0400 | [diff] [blame] | 4172 | /* If any sort of compatibility mode is enabled then handoff processing |
| 4173 | * to the selinux_sock_rcv_skb_compat() function to deal with the |
| 4174 | * special handling. We do this in an attempt to keep this function |
| 4175 | * as fast and as clean as possible. */ |
Paul Moore | 58bfbb5 | 2009-03-27 17:10:41 -0400 | [diff] [blame] | 4176 | if (!selinux_policycap_netpeer) |
Paul Moore | d8395c8 | 2008-10-10 10:16:30 -0400 | [diff] [blame] | 4177 | return selinux_sock_rcv_skb_compat(sk, skb, family); |
| 4178 | |
| 4179 | secmark_active = selinux_secmark_enabled(); |
| 4180 | peerlbl_active = netlbl_enabled() || selinux_xfrm_enabled(); |
| 4181 | if (!secmark_active && !peerlbl_active) |
| 4182 | return 0; |
| 4183 | |
Eric Paris | 50c205f | 2012-04-04 15:01:43 -0400 | [diff] [blame] | 4184 | ad.type = LSM_AUDIT_DATA_NET; |
Eric Paris | 48c62af | 2012-04-02 13:15:44 -0400 | [diff] [blame] | 4185 | ad.u.net = &net; |
| 4186 | ad.u.net->netif = skb->skb_iif; |
| 4187 | ad.u.net->family = family; |
Paul Moore | 224dfbd | 2008-01-29 08:38:13 -0500 | [diff] [blame] | 4188 | err = selinux_parse_skb(skb, &ad, &addrp, 1, NULL); |
James Morris | 4e5ab4c | 2006-06-09 00:33:33 -0700 | [diff] [blame] | 4189 | if (err) |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4190 | return err; |
James Morris | 4e5ab4c | 2006-06-09 00:33:33 -0700 | [diff] [blame] | 4191 | |
Paul Moore | d8395c8 | 2008-10-10 10:16:30 -0400 | [diff] [blame] | 4192 | if (peerlbl_active) { |
Paul Moore | d621d35 | 2008-01-29 08:43:36 -0500 | [diff] [blame] | 4193 | u32 peer_sid; |
| 4194 | |
| 4195 | err = selinux_skb_peerlbl_sid(skb, family, &peer_sid); |
| 4196 | if (err) |
| 4197 | return err; |
Eric Dumazet | 8964be4 | 2009-11-20 15:35:04 -0800 | [diff] [blame] | 4198 | err = selinux_inet_sys_rcv_skb(skb->skb_iif, addrp, family, |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4199 | peer_sid, &ad); |
Paul Moore | dfaebe9 | 2008-10-10 10:16:31 -0400 | [diff] [blame] | 4200 | if (err) { |
| 4201 | selinux_netlbl_err(skb, err, 0); |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4202 | return err; |
Paul Moore | dfaebe9 | 2008-10-10 10:16:31 -0400 | [diff] [blame] | 4203 | } |
Paul Moore | d621d35 | 2008-01-29 08:43:36 -0500 | [diff] [blame] | 4204 | err = avc_has_perm(sk_sid, peer_sid, SECCLASS_PEER, |
| 4205 | PEER__RECV, &ad); |
Paul Moore | dfaebe9 | 2008-10-10 10:16:31 -0400 | [diff] [blame] | 4206 | if (err) |
| 4207 | selinux_netlbl_err(skb, err, 0); |
Paul Moore | d621d35 | 2008-01-29 08:43:36 -0500 | [diff] [blame] | 4208 | } |
| 4209 | |
Paul Moore | d8395c8 | 2008-10-10 10:16:30 -0400 | [diff] [blame] | 4210 | if (secmark_active) { |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4211 | err = avc_has_perm(sk_sid, skb->secmark, SECCLASS_PACKET, |
| 4212 | PACKET__RECV, &ad); |
| 4213 | if (err) |
| 4214 | return err; |
| 4215 | } |
| 4216 | |
Paul Moore | d621d35 | 2008-01-29 08:43:36 -0500 | [diff] [blame] | 4217 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4218 | } |
| 4219 | |
Catherine Zhang | 2c7946a | 2006-03-20 22:41:23 -0800 | [diff] [blame] | 4220 | static int selinux_socket_getpeersec_stream(struct socket *sock, char __user *optval, |
| 4221 | int __user *optlen, unsigned len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4222 | { |
| 4223 | int err = 0; |
| 4224 | char *scontext; |
| 4225 | u32 scontext_len; |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 4226 | struct sk_security_struct *sksec = sock->sk->sk_security; |
Paul Moore | 3de4bab | 2006-11-17 17:38:54 -0500 | [diff] [blame] | 4227 | u32 peer_sid = SECSID_NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4228 | |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 4229 | if (sksec->sclass == SECCLASS_UNIX_STREAM_SOCKET || |
| 4230 | sksec->sclass == SECCLASS_TCP_SOCKET) |
Eric Paris | dd3e783 | 2010-04-07 15:08:46 -0400 | [diff] [blame] | 4231 | peer_sid = sksec->peer_sid; |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 4232 | if (peer_sid == SECSID_NULL) |
| 4233 | return -ENOPROTOOPT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4234 | |
Catherine Zhang | 2c7946a | 2006-03-20 22:41:23 -0800 | [diff] [blame] | 4235 | err = security_sid_to_context(peer_sid, &scontext, &scontext_len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4236 | if (err) |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 4237 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4238 | |
| 4239 | if (scontext_len > len) { |
| 4240 | err = -ERANGE; |
| 4241 | goto out_len; |
| 4242 | } |
| 4243 | |
| 4244 | if (copy_to_user(optval, scontext, scontext_len)) |
| 4245 | err = -EFAULT; |
| 4246 | |
| 4247 | out_len: |
| 4248 | if (put_user(scontext_len, optlen)) |
| 4249 | err = -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4250 | kfree(scontext); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4251 | return err; |
| 4252 | } |
| 4253 | |
Catherine Zhang | dc49c1f | 2006-08-02 14:12:06 -0700 | [diff] [blame] | 4254 | 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] | 4255 | { |
Catherine Zhang | dc49c1f | 2006-08-02 14:12:06 -0700 | [diff] [blame] | 4256 | u32 peer_secid = SECSID_NULL; |
Paul Moore | 75e2291 | 2008-01-29 08:38:04 -0500 | [diff] [blame] | 4257 | u16 family; |
Catherine Zhang | 877ce7c | 2006-06-29 12:27:47 -0700 | [diff] [blame] | 4258 | |
Paul Moore | aa86290 | 2008-10-10 10:16:29 -0400 | [diff] [blame] | 4259 | if (skb && skb->protocol == htons(ETH_P_IP)) |
| 4260 | family = PF_INET; |
| 4261 | else if (skb && skb->protocol == htons(ETH_P_IPV6)) |
| 4262 | family = PF_INET6; |
| 4263 | else if (sock) |
Paul Moore | 75e2291 | 2008-01-29 08:38:04 -0500 | [diff] [blame] | 4264 | family = sock->sk->sk_family; |
Paul Moore | 75e2291 | 2008-01-29 08:38:04 -0500 | [diff] [blame] | 4265 | else |
| 4266 | goto out; |
| 4267 | |
| 4268 | if (sock && family == PF_UNIX) |
Ahmed S. Darwish | 713a04ae | 2008-03-01 21:52:30 +0200 | [diff] [blame] | 4269 | selinux_inode_getsecid(SOCK_INODE(sock), &peer_secid); |
Paul Moore | 3de4bab | 2006-11-17 17:38:54 -0500 | [diff] [blame] | 4270 | else if (skb) |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4271 | selinux_skb_peerlbl_sid(skb, family, &peer_secid); |
Catherine Zhang | 2c7946a | 2006-03-20 22:41:23 -0800 | [diff] [blame] | 4272 | |
Paul Moore | 75e2291 | 2008-01-29 08:38:04 -0500 | [diff] [blame] | 4273 | out: |
Catherine Zhang | dc49c1f | 2006-08-02 14:12:06 -0700 | [diff] [blame] | 4274 | *secid = peer_secid; |
Paul Moore | 75e2291 | 2008-01-29 08:38:04 -0500 | [diff] [blame] | 4275 | if (peer_secid == SECSID_NULL) |
| 4276 | return -EINVAL; |
| 4277 | return 0; |
Catherine Zhang | 2c7946a | 2006-03-20 22:41:23 -0800 | [diff] [blame] | 4278 | } |
| 4279 | |
Al Viro | 7d877f3 | 2005-10-21 03:20:43 -0400 | [diff] [blame] | 4280 | 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] | 4281 | { |
Paul Moore | 84914b7 | 2010-04-22 14:46:18 -0400 | [diff] [blame] | 4282 | struct sk_security_struct *sksec; |
| 4283 | |
| 4284 | sksec = kzalloc(sizeof(*sksec), priority); |
| 4285 | if (!sksec) |
| 4286 | return -ENOMEM; |
| 4287 | |
| 4288 | sksec->peer_sid = SECINITSID_UNLABELED; |
| 4289 | sksec->sid = SECINITSID_UNLABELED; |
| 4290 | selinux_netlbl_sk_security_reset(sksec); |
| 4291 | sk->sk_security = sksec; |
| 4292 | |
| 4293 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4294 | } |
| 4295 | |
| 4296 | static void selinux_sk_free_security(struct sock *sk) |
| 4297 | { |
Paul Moore | 84914b7 | 2010-04-22 14:46:18 -0400 | [diff] [blame] | 4298 | struct sk_security_struct *sksec = sk->sk_security; |
| 4299 | |
| 4300 | sk->sk_security = NULL; |
| 4301 | selinux_netlbl_sk_security_free(sksec); |
| 4302 | kfree(sksec); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4303 | } |
| 4304 | |
Venkat Yekkirala | 892c141 | 2006-08-04 23:08:56 -0700 | [diff] [blame] | 4305 | static void selinux_sk_clone_security(const struct sock *sk, struct sock *newsk) |
| 4306 | { |
Eric Paris | dd3e783 | 2010-04-07 15:08:46 -0400 | [diff] [blame] | 4307 | struct sk_security_struct *sksec = sk->sk_security; |
| 4308 | struct sk_security_struct *newsksec = newsk->sk_security; |
Venkat Yekkirala | 892c141 | 2006-08-04 23:08:56 -0700 | [diff] [blame] | 4309 | |
Eric Paris | dd3e783 | 2010-04-07 15:08:46 -0400 | [diff] [blame] | 4310 | newsksec->sid = sksec->sid; |
| 4311 | newsksec->peer_sid = sksec->peer_sid; |
| 4312 | newsksec->sclass = sksec->sclass; |
Paul Moore | 99f59ed | 2006-08-29 17:53:48 -0700 | [diff] [blame] | 4313 | |
Eric Paris | dd3e783 | 2010-04-07 15:08:46 -0400 | [diff] [blame] | 4314 | selinux_netlbl_sk_security_reset(newsksec); |
Venkat Yekkirala | 892c141 | 2006-08-04 23:08:56 -0700 | [diff] [blame] | 4315 | } |
| 4316 | |
Venkat Yekkirala | beb8d13 | 2006-08-04 23:12:42 -0700 | [diff] [blame] | 4317 | static void selinux_sk_getsecid(struct sock *sk, u32 *secid) |
Trent Jaeger | d28d1e0 | 2005-12-13 23:12:40 -0800 | [diff] [blame] | 4318 | { |
Trent Jaeger | d28d1e0 | 2005-12-13 23:12:40 -0800 | [diff] [blame] | 4319 | if (!sk) |
Venkat Yekkirala | beb8d13 | 2006-08-04 23:12:42 -0700 | [diff] [blame] | 4320 | *secid = SECINITSID_ANY_SOCKET; |
Venkat Yekkirala | 892c141 | 2006-08-04 23:08:56 -0700 | [diff] [blame] | 4321 | else { |
| 4322 | struct sk_security_struct *sksec = sk->sk_security; |
Trent Jaeger | d28d1e0 | 2005-12-13 23:12:40 -0800 | [diff] [blame] | 4323 | |
Venkat Yekkirala | beb8d13 | 2006-08-04 23:12:42 -0700 | [diff] [blame] | 4324 | *secid = sksec->sid; |
Venkat Yekkirala | 892c141 | 2006-08-04 23:08:56 -0700 | [diff] [blame] | 4325 | } |
Trent Jaeger | d28d1e0 | 2005-12-13 23:12:40 -0800 | [diff] [blame] | 4326 | } |
| 4327 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 4328 | static void selinux_sock_graft(struct sock *sk, struct socket *parent) |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 4329 | { |
| 4330 | struct inode_security_struct *isec = SOCK_INODE(parent)->i_security; |
| 4331 | struct sk_security_struct *sksec = sk->sk_security; |
| 4332 | |
David Woodhouse | 2148ccc | 2006-09-29 15:50:25 -0700 | [diff] [blame] | 4333 | if (sk->sk_family == PF_INET || sk->sk_family == PF_INET6 || |
| 4334 | sk->sk_family == PF_UNIX) |
| 4335 | isec->sid = sksec->sid; |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4336 | sksec->sclass = isec->sclass; |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 4337 | } |
| 4338 | |
Adrian Bunk | 9a673e5 | 2006-08-15 00:03:53 -0700 | [diff] [blame] | 4339 | static int selinux_inet_conn_request(struct sock *sk, struct sk_buff *skb, |
| 4340 | struct request_sock *req) |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 4341 | { |
| 4342 | struct sk_security_struct *sksec = sk->sk_security; |
| 4343 | int err; |
Paul Moore | aa86290 | 2008-10-10 10:16:29 -0400 | [diff] [blame] | 4344 | u16 family = sk->sk_family; |
Venkat Yekkirala | 7420ed2 | 2006-08-04 23:17:57 -0700 | [diff] [blame] | 4345 | u32 newsid; |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 4346 | u32 peersid; |
| 4347 | |
Paul Moore | aa86290 | 2008-10-10 10:16:29 -0400 | [diff] [blame] | 4348 | /* handle mapped IPv4 packets arriving via IPv6 sockets */ |
| 4349 | if (family == PF_INET6 && skb->protocol == htons(ETH_P_IP)) |
| 4350 | family = PF_INET; |
| 4351 | |
| 4352 | err = selinux_skb_peerlbl_sid(skb, family, &peersid); |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4353 | if (err) |
| 4354 | return err; |
Venkat Yekkirala | a51c64f | 2006-07-27 22:01:34 -0700 | [diff] [blame] | 4355 | if (peersid == SECSID_NULL) { |
| 4356 | req->secid = sksec->sid; |
Paul Moore | 3de4bab | 2006-11-17 17:38:54 -0500 | [diff] [blame] | 4357 | req->peer_secid = SECSID_NULL; |
Paul Moore | 389fb800 | 2009-03-27 17:10:34 -0400 | [diff] [blame] | 4358 | } else { |
| 4359 | err = security_sid_mls_copy(sksec->sid, peersid, &newsid); |
| 4360 | if (err) |
| 4361 | return err; |
| 4362 | req->secid = newsid; |
| 4363 | req->peer_secid = peersid; |
Venkat Yekkirala | a51c64f | 2006-07-27 22:01:34 -0700 | [diff] [blame] | 4364 | } |
| 4365 | |
Paul Moore | 389fb800 | 2009-03-27 17:10:34 -0400 | [diff] [blame] | 4366 | return selinux_netlbl_inet_conn_request(req, family); |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 4367 | } |
| 4368 | |
Adrian Bunk | 9a673e5 | 2006-08-15 00:03:53 -0700 | [diff] [blame] | 4369 | static void selinux_inet_csk_clone(struct sock *newsk, |
| 4370 | const struct request_sock *req) |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 4371 | { |
| 4372 | struct sk_security_struct *newsksec = newsk->sk_security; |
| 4373 | |
| 4374 | newsksec->sid = req->secid; |
Venkat Yekkirala | 6b87769 | 2006-11-08 17:04:09 -0600 | [diff] [blame] | 4375 | newsksec->peer_sid = req->peer_secid; |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 4376 | /* NOTE: Ideally, we should also get the isec->sid for the |
| 4377 | new socket in sync, but we don't have the isec available yet. |
| 4378 | So we will wait until sock_graft to do it, by which |
| 4379 | time it will have been created and available. */ |
Paul Moore | 99f59ed | 2006-08-29 17:53:48 -0700 | [diff] [blame] | 4380 | |
Paul Moore | 9f2ad66 | 2006-11-17 17:38:53 -0500 | [diff] [blame] | 4381 | /* We don't need to take any sort of lock here as we are the only |
| 4382 | * thread with access to newsksec */ |
Paul Moore | 389fb800 | 2009-03-27 17:10:34 -0400 | [diff] [blame] | 4383 | selinux_netlbl_inet_csk_clone(newsk, req->rsk_ops->family); |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 4384 | } |
| 4385 | |
Paul Moore | 014ab19 | 2008-10-10 10:16:33 -0400 | [diff] [blame] | 4386 | 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] | 4387 | { |
Paul Moore | aa86290 | 2008-10-10 10:16:29 -0400 | [diff] [blame] | 4388 | u16 family = sk->sk_family; |
Venkat Yekkirala | 6b87769 | 2006-11-08 17:04:09 -0600 | [diff] [blame] | 4389 | struct sk_security_struct *sksec = sk->sk_security; |
| 4390 | |
Paul Moore | aa86290 | 2008-10-10 10:16:29 -0400 | [diff] [blame] | 4391 | /* handle mapped IPv4 packets arriving via IPv6 sockets */ |
| 4392 | if (family == PF_INET6 && skb->protocol == htons(ETH_P_IP)) |
| 4393 | family = PF_INET; |
| 4394 | |
| 4395 | selinux_skb_peerlbl_sid(skb, family, &sksec->peer_sid); |
Venkat Yekkirala | 6b87769 | 2006-11-08 17:04:09 -0600 | [diff] [blame] | 4396 | } |
| 4397 | |
Eric Dumazet | ca10b9e | 2013-04-08 17:58:11 +0000 | [diff] [blame] | 4398 | static void selinux_skb_owned_by(struct sk_buff *skb, struct sock *sk) |
| 4399 | { |
| 4400 | skb_set_owner_w(skb, sk); |
| 4401 | } |
| 4402 | |
Eric Paris | 2606fd1 | 2010-10-13 16:24:41 -0400 | [diff] [blame] | 4403 | static int selinux_secmark_relabel_packet(u32 sid) |
| 4404 | { |
| 4405 | const struct task_security_struct *__tsec; |
| 4406 | u32 tsid; |
| 4407 | |
| 4408 | __tsec = current_security(); |
| 4409 | tsid = __tsec->sid; |
| 4410 | |
| 4411 | return avc_has_perm(tsid, sid, SECCLASS_PACKET, PACKET__RELABELTO, NULL); |
| 4412 | } |
| 4413 | |
| 4414 | static void selinux_secmark_refcount_inc(void) |
| 4415 | { |
| 4416 | atomic_inc(&selinux_secmark_refcount); |
| 4417 | } |
| 4418 | |
| 4419 | static void selinux_secmark_refcount_dec(void) |
| 4420 | { |
| 4421 | atomic_dec(&selinux_secmark_refcount); |
| 4422 | } |
| 4423 | |
Adrian Bunk | 9a673e5 | 2006-08-15 00:03:53 -0700 | [diff] [blame] | 4424 | static void selinux_req_classify_flow(const struct request_sock *req, |
| 4425 | struct flowi *fl) |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 4426 | { |
David S. Miller | 1d28f42 | 2011-03-12 00:29:39 -0500 | [diff] [blame] | 4427 | fl->flowi_secid = req->secid; |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 4428 | } |
| 4429 | |
Paul Moore | 5dbbaf2 | 2013-01-14 07:12:19 +0000 | [diff] [blame] | 4430 | static int selinux_tun_dev_alloc_security(void **security) |
| 4431 | { |
| 4432 | struct tun_security_struct *tunsec; |
| 4433 | |
| 4434 | tunsec = kzalloc(sizeof(*tunsec), GFP_KERNEL); |
| 4435 | if (!tunsec) |
| 4436 | return -ENOMEM; |
| 4437 | tunsec->sid = current_sid(); |
| 4438 | |
| 4439 | *security = tunsec; |
| 4440 | return 0; |
| 4441 | } |
| 4442 | |
| 4443 | static void selinux_tun_dev_free_security(void *security) |
| 4444 | { |
| 4445 | kfree(security); |
| 4446 | } |
| 4447 | |
Paul Moore | ed6d76e | 2009-08-28 18:12:49 -0400 | [diff] [blame] | 4448 | static int selinux_tun_dev_create(void) |
| 4449 | { |
| 4450 | u32 sid = current_sid(); |
| 4451 | |
| 4452 | /* we aren't taking into account the "sockcreate" SID since the socket |
| 4453 | * that is being created here is not a socket in the traditional sense, |
| 4454 | * instead it is a private sock, accessible only to the kernel, and |
| 4455 | * representing a wide range of network traffic spanning multiple |
| 4456 | * connections unlike traditional sockets - check the TUN driver to |
| 4457 | * get a better understanding of why this socket is special */ |
| 4458 | |
| 4459 | return avc_has_perm(sid, sid, SECCLASS_TUN_SOCKET, TUN_SOCKET__CREATE, |
| 4460 | NULL); |
| 4461 | } |
| 4462 | |
Paul Moore | 5dbbaf2 | 2013-01-14 07:12:19 +0000 | [diff] [blame] | 4463 | static int selinux_tun_dev_attach_queue(void *security) |
Paul Moore | ed6d76e | 2009-08-28 18:12:49 -0400 | [diff] [blame] | 4464 | { |
Paul Moore | 5dbbaf2 | 2013-01-14 07:12:19 +0000 | [diff] [blame] | 4465 | struct tun_security_struct *tunsec = security; |
| 4466 | |
| 4467 | return avc_has_perm(current_sid(), tunsec->sid, SECCLASS_TUN_SOCKET, |
| 4468 | TUN_SOCKET__ATTACH_QUEUE, NULL); |
| 4469 | } |
| 4470 | |
| 4471 | static int selinux_tun_dev_attach(struct sock *sk, void *security) |
| 4472 | { |
| 4473 | struct tun_security_struct *tunsec = security; |
Paul Moore | ed6d76e | 2009-08-28 18:12:49 -0400 | [diff] [blame] | 4474 | struct sk_security_struct *sksec = sk->sk_security; |
| 4475 | |
| 4476 | /* we don't currently perform any NetLabel based labeling here and it |
| 4477 | * isn't clear that we would want to do so anyway; while we could apply |
| 4478 | * labeling without the support of the TUN user the resulting labeled |
| 4479 | * traffic from the other end of the connection would almost certainly |
| 4480 | * cause confusion to the TUN user that had no idea network labeling |
| 4481 | * protocols were being used */ |
| 4482 | |
Paul Moore | 5dbbaf2 | 2013-01-14 07:12:19 +0000 | [diff] [blame] | 4483 | sksec->sid = tunsec->sid; |
Paul Moore | ed6d76e | 2009-08-28 18:12:49 -0400 | [diff] [blame] | 4484 | sksec->sclass = SECCLASS_TUN_SOCKET; |
Paul Moore | 5dbbaf2 | 2013-01-14 07:12:19 +0000 | [diff] [blame] | 4485 | |
| 4486 | return 0; |
Paul Moore | ed6d76e | 2009-08-28 18:12:49 -0400 | [diff] [blame] | 4487 | } |
| 4488 | |
Paul Moore | 5dbbaf2 | 2013-01-14 07:12:19 +0000 | [diff] [blame] | 4489 | static int selinux_tun_dev_open(void *security) |
Paul Moore | ed6d76e | 2009-08-28 18:12:49 -0400 | [diff] [blame] | 4490 | { |
Paul Moore | 5dbbaf2 | 2013-01-14 07:12:19 +0000 | [diff] [blame] | 4491 | struct tun_security_struct *tunsec = security; |
Paul Moore | ed6d76e | 2009-08-28 18:12:49 -0400 | [diff] [blame] | 4492 | u32 sid = current_sid(); |
| 4493 | int err; |
| 4494 | |
Paul Moore | 5dbbaf2 | 2013-01-14 07:12:19 +0000 | [diff] [blame] | 4495 | err = avc_has_perm(sid, tunsec->sid, SECCLASS_TUN_SOCKET, |
Paul Moore | ed6d76e | 2009-08-28 18:12:49 -0400 | [diff] [blame] | 4496 | TUN_SOCKET__RELABELFROM, NULL); |
| 4497 | if (err) |
| 4498 | return err; |
| 4499 | err = avc_has_perm(sid, sid, SECCLASS_TUN_SOCKET, |
| 4500 | TUN_SOCKET__RELABELTO, NULL); |
| 4501 | if (err) |
| 4502 | return err; |
Paul Moore | 5dbbaf2 | 2013-01-14 07:12:19 +0000 | [diff] [blame] | 4503 | tunsec->sid = sid; |
Paul Moore | ed6d76e | 2009-08-28 18:12:49 -0400 | [diff] [blame] | 4504 | |
| 4505 | return 0; |
| 4506 | } |
| 4507 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4508 | static int selinux_nlmsg_perm(struct sock *sk, struct sk_buff *skb) |
| 4509 | { |
| 4510 | int err = 0; |
| 4511 | u32 perm; |
| 4512 | struct nlmsghdr *nlh; |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 4513 | struct sk_security_struct *sksec = sk->sk_security; |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 4514 | |
Hong zhi guo | 7795498 | 2013-03-27 06:49:35 +0000 | [diff] [blame] | 4515 | if (skb->len < NLMSG_HDRLEN) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4516 | err = -EINVAL; |
| 4517 | goto out; |
| 4518 | } |
Arnaldo Carvalho de Melo | b529ccf | 2007-04-25 19:08:35 -0700 | [diff] [blame] | 4519 | nlh = nlmsg_hdr(skb); |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 4520 | |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 4521 | err = selinux_nlmsg_lookup(sksec->sclass, nlh->nlmsg_type, &perm); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4522 | if (err) { |
| 4523 | if (err == -EINVAL) { |
David Woodhouse | 9ad9ad3 | 2005-06-22 15:04:33 +0100 | [diff] [blame] | 4524 | audit_log(current->audit_context, GFP_KERNEL, AUDIT_SELINUX_ERR, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4525 | "SELinux: unrecognized netlink message" |
| 4526 | " type=%hu for sclass=%hu\n", |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 4527 | nlh->nlmsg_type, sksec->sclass); |
Eric Paris | 39c9aed | 2008-11-05 09:34:42 -0500 | [diff] [blame] | 4528 | if (!selinux_enforcing || security_get_allow_unknown()) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4529 | err = 0; |
| 4530 | } |
| 4531 | |
| 4532 | /* Ignore */ |
| 4533 | if (err == -ENOENT) |
| 4534 | err = 0; |
| 4535 | goto out; |
| 4536 | } |
| 4537 | |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 4538 | err = sock_has_perm(current, sk, perm); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4539 | out: |
| 4540 | return err; |
| 4541 | } |
| 4542 | |
| 4543 | #ifdef CONFIG_NETFILTER |
| 4544 | |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4545 | static unsigned int selinux_ip_forward(struct sk_buff *skb, int ifindex, |
| 4546 | u16 family) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4547 | { |
Paul Moore | dfaebe9 | 2008-10-10 10:16:31 -0400 | [diff] [blame] | 4548 | int err; |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4549 | char *addrp; |
| 4550 | u32 peer_sid; |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 4551 | struct common_audit_data ad; |
Eric Paris | 48c62af | 2012-04-02 13:15:44 -0400 | [diff] [blame] | 4552 | struct lsm_network_audit net = {0,}; |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4553 | u8 secmark_active; |
Paul Moore | 948bf85 | 2008-10-10 10:16:32 -0400 | [diff] [blame] | 4554 | u8 netlbl_active; |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4555 | u8 peerlbl_active; |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 4556 | |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4557 | if (!selinux_policycap_netpeer) |
| 4558 | return NF_ACCEPT; |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 4559 | |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4560 | secmark_active = selinux_secmark_enabled(); |
Paul Moore | 948bf85 | 2008-10-10 10:16:32 -0400 | [diff] [blame] | 4561 | netlbl_active = netlbl_enabled(); |
| 4562 | peerlbl_active = netlbl_active || selinux_xfrm_enabled(); |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4563 | if (!secmark_active && !peerlbl_active) |
| 4564 | return NF_ACCEPT; |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 4565 | |
Paul Moore | d8395c8 | 2008-10-10 10:16:30 -0400 | [diff] [blame] | 4566 | if (selinux_skb_peerlbl_sid(skb, family, &peer_sid) != 0) |
| 4567 | return NF_DROP; |
| 4568 | |
Eric Paris | 50c205f | 2012-04-04 15:01:43 -0400 | [diff] [blame] | 4569 | ad.type = LSM_AUDIT_DATA_NET; |
Eric Paris | 48c62af | 2012-04-02 13:15:44 -0400 | [diff] [blame] | 4570 | ad.u.net = &net; |
| 4571 | ad.u.net->netif = ifindex; |
| 4572 | ad.u.net->family = family; |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4573 | if (selinux_parse_skb(skb, &ad, &addrp, 1, NULL) != 0) |
| 4574 | return NF_DROP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4575 | |
Paul Moore | dfaebe9 | 2008-10-10 10:16:31 -0400 | [diff] [blame] | 4576 | if (peerlbl_active) { |
| 4577 | err = selinux_inet_sys_rcv_skb(ifindex, addrp, family, |
| 4578 | peer_sid, &ad); |
| 4579 | if (err) { |
| 4580 | selinux_netlbl_err(skb, err, 1); |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4581 | return NF_DROP; |
Paul Moore | dfaebe9 | 2008-10-10 10:16:31 -0400 | [diff] [blame] | 4582 | } |
| 4583 | } |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4584 | |
| 4585 | if (secmark_active) |
| 4586 | if (avc_has_perm(peer_sid, skb->secmark, |
| 4587 | SECCLASS_PACKET, PACKET__FORWARD_IN, &ad)) |
| 4588 | return NF_DROP; |
| 4589 | |
Paul Moore | 948bf85 | 2008-10-10 10:16:32 -0400 | [diff] [blame] | 4590 | if (netlbl_active) |
| 4591 | /* we do this in the FORWARD path and not the POST_ROUTING |
| 4592 | * path because we want to make sure we apply the necessary |
| 4593 | * labeling before IPsec is applied so we can leverage AH |
| 4594 | * protection */ |
| 4595 | if (selinux_netlbl_skbuff_setsid(skb, family, peer_sid) != 0) |
| 4596 | return NF_DROP; |
| 4597 | |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4598 | return NF_ACCEPT; |
| 4599 | } |
| 4600 | |
| 4601 | static unsigned int selinux_ipv4_forward(unsigned int hooknum, |
| 4602 | struct sk_buff *skb, |
| 4603 | const struct net_device *in, |
| 4604 | const struct net_device *out, |
| 4605 | int (*okfn)(struct sk_buff *)) |
| 4606 | { |
| 4607 | return selinux_ip_forward(skb, in->ifindex, PF_INET); |
| 4608 | } |
| 4609 | |
| 4610 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
| 4611 | static unsigned int selinux_ipv6_forward(unsigned int hooknum, |
| 4612 | struct sk_buff *skb, |
| 4613 | const struct net_device *in, |
| 4614 | const struct net_device *out, |
| 4615 | int (*okfn)(struct sk_buff *)) |
| 4616 | { |
| 4617 | return selinux_ip_forward(skb, in->ifindex, PF_INET6); |
| 4618 | } |
| 4619 | #endif /* IPV6 */ |
| 4620 | |
Paul Moore | 948bf85 | 2008-10-10 10:16:32 -0400 | [diff] [blame] | 4621 | static unsigned int selinux_ip_output(struct sk_buff *skb, |
| 4622 | u16 family) |
| 4623 | { |
| 4624 | u32 sid; |
| 4625 | |
| 4626 | if (!netlbl_enabled()) |
| 4627 | return NF_ACCEPT; |
| 4628 | |
| 4629 | /* we do this in the LOCAL_OUT path and not the POST_ROUTING path |
| 4630 | * because we want to make sure we apply the necessary labeling |
| 4631 | * before IPsec is applied so we can leverage AH protection */ |
| 4632 | if (skb->sk) { |
| 4633 | struct sk_security_struct *sksec = skb->sk->sk_security; |
| 4634 | sid = sksec->sid; |
| 4635 | } else |
| 4636 | sid = SECINITSID_KERNEL; |
| 4637 | if (selinux_netlbl_skbuff_setsid(skb, family, sid) != 0) |
| 4638 | return NF_DROP; |
| 4639 | |
| 4640 | return NF_ACCEPT; |
| 4641 | } |
| 4642 | |
| 4643 | static unsigned int selinux_ipv4_output(unsigned int hooknum, |
| 4644 | struct sk_buff *skb, |
| 4645 | const struct net_device *in, |
| 4646 | const struct net_device *out, |
| 4647 | int (*okfn)(struct sk_buff *)) |
| 4648 | { |
| 4649 | return selinux_ip_output(skb, PF_INET); |
| 4650 | } |
| 4651 | |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4652 | static unsigned int selinux_ip_postroute_compat(struct sk_buff *skb, |
| 4653 | int ifindex, |
Paul Moore | d8395c8 | 2008-10-10 10:16:30 -0400 | [diff] [blame] | 4654 | u16 family) |
James Morris | 4e5ab4c | 2006-06-09 00:33:33 -0700 | [diff] [blame] | 4655 | { |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4656 | struct sock *sk = skb->sk; |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 4657 | struct sk_security_struct *sksec; |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 4658 | struct common_audit_data ad; |
Eric Paris | 48c62af | 2012-04-02 13:15:44 -0400 | [diff] [blame] | 4659 | struct lsm_network_audit net = {0,}; |
Paul Moore | d8395c8 | 2008-10-10 10:16:30 -0400 | [diff] [blame] | 4660 | char *addrp; |
| 4661 | u8 proto; |
James Morris | 4e5ab4c | 2006-06-09 00:33:33 -0700 | [diff] [blame] | 4662 | |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4663 | if (sk == NULL) |
| 4664 | return NF_ACCEPT; |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 4665 | sksec = sk->sk_security; |
James Morris | 4e5ab4c | 2006-06-09 00:33:33 -0700 | [diff] [blame] | 4666 | |
Eric Paris | 50c205f | 2012-04-04 15:01:43 -0400 | [diff] [blame] | 4667 | ad.type = LSM_AUDIT_DATA_NET; |
Eric Paris | 48c62af | 2012-04-02 13:15:44 -0400 | [diff] [blame] | 4668 | ad.u.net = &net; |
| 4669 | ad.u.net->netif = ifindex; |
| 4670 | ad.u.net->family = family; |
Paul Moore | d8395c8 | 2008-10-10 10:16:30 -0400 | [diff] [blame] | 4671 | if (selinux_parse_skb(skb, &ad, &addrp, 0, &proto)) |
| 4672 | return NF_DROP; |
| 4673 | |
Paul Moore | 58bfbb5 | 2009-03-27 17:10:41 -0400 | [diff] [blame] | 4674 | if (selinux_secmark_enabled()) |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4675 | if (avc_has_perm(sksec->sid, skb->secmark, |
Paul Moore | d8395c8 | 2008-10-10 10:16:30 -0400 | [diff] [blame] | 4676 | SECCLASS_PACKET, PACKET__SEND, &ad)) |
Eric Paris | 2fe66ec | 2010-11-23 06:28:08 +0000 | [diff] [blame] | 4677 | return NF_DROP_ERR(-ECONNREFUSED); |
James Morris | 4e5ab4c | 2006-06-09 00:33:33 -0700 | [diff] [blame] | 4678 | |
Steffen Klassert | b9679a7 | 2011-02-23 12:55:21 +0100 | [diff] [blame] | 4679 | if (selinux_xfrm_postroute_last(sksec->sid, skb, &ad, proto)) |
| 4680 | return NF_DROP_ERR(-ECONNREFUSED); |
James Morris | 4e5ab4c | 2006-06-09 00:33:33 -0700 | [diff] [blame] | 4681 | |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4682 | return NF_ACCEPT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4683 | } |
| 4684 | |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4685 | static unsigned int selinux_ip_postroute(struct sk_buff *skb, int ifindex, |
| 4686 | u16 family) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4687 | { |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4688 | u32 secmark_perm; |
| 4689 | u32 peer_sid; |
| 4690 | struct sock *sk; |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 4691 | struct common_audit_data ad; |
Eric Paris | 48c62af | 2012-04-02 13:15:44 -0400 | [diff] [blame] | 4692 | struct lsm_network_audit net = {0,}; |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4693 | char *addrp; |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4694 | u8 secmark_active; |
| 4695 | u8 peerlbl_active; |
| 4696 | |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4697 | /* If any sort of compatibility mode is enabled then handoff processing |
| 4698 | * to the selinux_ip_postroute_compat() function to deal with the |
| 4699 | * special handling. We do this in an attempt to keep this function |
| 4700 | * as fast and as clean as possible. */ |
Paul Moore | 58bfbb5 | 2009-03-27 17:10:41 -0400 | [diff] [blame] | 4701 | if (!selinux_policycap_netpeer) |
Paul Moore | d8395c8 | 2008-10-10 10:16:30 -0400 | [diff] [blame] | 4702 | return selinux_ip_postroute_compat(skb, ifindex, family); |
Alexey Dobriyan | def8b4f | 2008-10-28 13:24:06 -0700 | [diff] [blame] | 4703 | #ifdef CONFIG_XFRM |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4704 | /* If skb->dst->xfrm is non-NULL then the packet is undergoing an IPsec |
| 4705 | * packet transformation so allow the packet to pass without any checks |
| 4706 | * since we'll have another chance to perform access control checks |
| 4707 | * when the packet is on it's final way out. |
| 4708 | * NOTE: there appear to be some IPv6 multicast cases where skb->dst |
| 4709 | * is NULL, in this case go ahead and apply access control. */ |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 4710 | if (skb_dst(skb) != NULL && skb_dst(skb)->xfrm != NULL) |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4711 | return NF_ACCEPT; |
Alexey Dobriyan | def8b4f | 2008-10-28 13:24:06 -0700 | [diff] [blame] | 4712 | #endif |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4713 | secmark_active = selinux_secmark_enabled(); |
| 4714 | peerlbl_active = netlbl_enabled() || selinux_xfrm_enabled(); |
| 4715 | if (!secmark_active && !peerlbl_active) |
| 4716 | return NF_ACCEPT; |
| 4717 | |
Paul Moore | d8395c8 | 2008-10-10 10:16:30 -0400 | [diff] [blame] | 4718 | /* if the packet is being forwarded then get the peer label from the |
| 4719 | * packet itself; otherwise check to see if it is from a local |
| 4720 | * application or the kernel, if from an application get the peer label |
| 4721 | * from the sending socket, otherwise use the kernel's sid */ |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4722 | sk = skb->sk; |
Paul Moore | d8395c8 | 2008-10-10 10:16:30 -0400 | [diff] [blame] | 4723 | if (sk == NULL) { |
Steffen Klassert | 4a7ab3d | 2011-02-23 12:56:23 +0100 | [diff] [blame] | 4724 | if (skb->skb_iif) { |
| 4725 | secmark_perm = PACKET__FORWARD_OUT; |
Paul Moore | d8395c8 | 2008-10-10 10:16:30 -0400 | [diff] [blame] | 4726 | if (selinux_skb_peerlbl_sid(skb, family, &peer_sid)) |
Eric Paris | 04f6d70 | 2010-11-23 06:28:02 +0000 | [diff] [blame] | 4727 | return NF_DROP; |
Steffen Klassert | 4a7ab3d | 2011-02-23 12:56:23 +0100 | [diff] [blame] | 4728 | } else { |
| 4729 | secmark_perm = PACKET__SEND; |
Paul Moore | d8395c8 | 2008-10-10 10:16:30 -0400 | [diff] [blame] | 4730 | peer_sid = SECINITSID_KERNEL; |
Steffen Klassert | 4a7ab3d | 2011-02-23 12:56:23 +0100 | [diff] [blame] | 4731 | } |
Paul Moore | d8395c8 | 2008-10-10 10:16:30 -0400 | [diff] [blame] | 4732 | } else { |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4733 | struct sk_security_struct *sksec = sk->sk_security; |
| 4734 | peer_sid = sksec->sid; |
| 4735 | secmark_perm = PACKET__SEND; |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4736 | } |
| 4737 | |
Eric Paris | 50c205f | 2012-04-04 15:01:43 -0400 | [diff] [blame] | 4738 | ad.type = LSM_AUDIT_DATA_NET; |
Eric Paris | 48c62af | 2012-04-02 13:15:44 -0400 | [diff] [blame] | 4739 | ad.u.net = &net; |
| 4740 | ad.u.net->netif = ifindex; |
| 4741 | ad.u.net->family = family; |
Paul Moore | d8395c8 | 2008-10-10 10:16:30 -0400 | [diff] [blame] | 4742 | if (selinux_parse_skb(skb, &ad, &addrp, 0, NULL)) |
Eric Paris | 04f6d70 | 2010-11-23 06:28:02 +0000 | [diff] [blame] | 4743 | return NF_DROP; |
Paul Moore | d8395c8 | 2008-10-10 10:16:30 -0400 | [diff] [blame] | 4744 | |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4745 | if (secmark_active) |
| 4746 | if (avc_has_perm(peer_sid, skb->secmark, |
| 4747 | SECCLASS_PACKET, secmark_perm, &ad)) |
Eric Paris | 1f1aaf8 | 2010-11-16 11:52:57 +0000 | [diff] [blame] | 4748 | return NF_DROP_ERR(-ECONNREFUSED); |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4749 | |
| 4750 | if (peerlbl_active) { |
| 4751 | u32 if_sid; |
| 4752 | u32 node_sid; |
| 4753 | |
| 4754 | if (sel_netif_sid(ifindex, &if_sid)) |
Eric Paris | 04f6d70 | 2010-11-23 06:28:02 +0000 | [diff] [blame] | 4755 | return NF_DROP; |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4756 | if (avc_has_perm(peer_sid, if_sid, |
| 4757 | SECCLASS_NETIF, NETIF__EGRESS, &ad)) |
Eric Paris | 1f1aaf8 | 2010-11-16 11:52:57 +0000 | [diff] [blame] | 4758 | return NF_DROP_ERR(-ECONNREFUSED); |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4759 | |
| 4760 | if (sel_netnode_sid(addrp, family, &node_sid)) |
Eric Paris | 04f6d70 | 2010-11-23 06:28:02 +0000 | [diff] [blame] | 4761 | return NF_DROP; |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4762 | if (avc_has_perm(peer_sid, node_sid, |
| 4763 | SECCLASS_NODE, NODE__SENDTO, &ad)) |
Eric Paris | 1f1aaf8 | 2010-11-16 11:52:57 +0000 | [diff] [blame] | 4764 | return NF_DROP_ERR(-ECONNREFUSED); |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4765 | } |
| 4766 | |
| 4767 | return NF_ACCEPT; |
| 4768 | } |
| 4769 | |
| 4770 | static unsigned int selinux_ipv4_postroute(unsigned int hooknum, |
| 4771 | struct sk_buff *skb, |
| 4772 | const struct net_device *in, |
| 4773 | const struct net_device *out, |
| 4774 | int (*okfn)(struct sk_buff *)) |
| 4775 | { |
| 4776 | return selinux_ip_postroute(skb, out->ifindex, PF_INET); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4777 | } |
| 4778 | |
| 4779 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4780 | static unsigned int selinux_ipv6_postroute(unsigned int hooknum, |
| 4781 | struct sk_buff *skb, |
| 4782 | const struct net_device *in, |
| 4783 | const struct net_device *out, |
| 4784 | int (*okfn)(struct sk_buff *)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4785 | { |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4786 | return selinux_ip_postroute(skb, out->ifindex, PF_INET6); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4787 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4788 | #endif /* IPV6 */ |
| 4789 | |
| 4790 | #endif /* CONFIG_NETFILTER */ |
| 4791 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4792 | static int selinux_netlink_send(struct sock *sk, struct sk_buff *skb) |
| 4793 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4794 | int err; |
| 4795 | |
Eric Paris | 200ac53 | 2009-02-12 15:01:04 -0500 | [diff] [blame] | 4796 | err = cap_netlink_send(sk, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4797 | if (err) |
| 4798 | return err; |
| 4799 | |
Stephen Smalley | 941fc5b | 2009-10-01 14:48:23 -0400 | [diff] [blame] | 4800 | return selinux_nlmsg_perm(sk, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4801 | } |
| 4802 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4803 | static int ipc_alloc_security(struct task_struct *task, |
| 4804 | struct kern_ipc_perm *perm, |
| 4805 | u16 sclass) |
| 4806 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4807 | struct ipc_security_struct *isec; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 4808 | u32 sid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4809 | |
James Morris | 89d155e | 2005-10-30 14:59:21 -0800 | [diff] [blame] | 4810 | isec = kzalloc(sizeof(struct ipc_security_struct), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4811 | if (!isec) |
| 4812 | return -ENOMEM; |
| 4813 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 4814 | sid = task_sid(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4815 | isec->sclass = sclass; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 4816 | isec->sid = sid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4817 | perm->security = isec; |
| 4818 | |
| 4819 | return 0; |
| 4820 | } |
| 4821 | |
| 4822 | static void ipc_free_security(struct kern_ipc_perm *perm) |
| 4823 | { |
| 4824 | struct ipc_security_struct *isec = perm->security; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4825 | perm->security = NULL; |
| 4826 | kfree(isec); |
| 4827 | } |
| 4828 | |
| 4829 | static int msg_msg_alloc_security(struct msg_msg *msg) |
| 4830 | { |
| 4831 | struct msg_security_struct *msec; |
| 4832 | |
James Morris | 89d155e | 2005-10-30 14:59:21 -0800 | [diff] [blame] | 4833 | msec = kzalloc(sizeof(struct msg_security_struct), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4834 | if (!msec) |
| 4835 | return -ENOMEM; |
| 4836 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4837 | msec->sid = SECINITSID_UNLABELED; |
| 4838 | msg->security = msec; |
| 4839 | |
| 4840 | return 0; |
| 4841 | } |
| 4842 | |
| 4843 | static void msg_msg_free_security(struct msg_msg *msg) |
| 4844 | { |
| 4845 | struct msg_security_struct *msec = msg->security; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4846 | |
| 4847 | msg->security = NULL; |
| 4848 | kfree(msec); |
| 4849 | } |
| 4850 | |
| 4851 | static int ipc_has_perm(struct kern_ipc_perm *ipc_perms, |
Stephen Smalley | 6af963f | 2005-05-01 08:58:39 -0700 | [diff] [blame] | 4852 | u32 perms) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4853 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4854 | struct ipc_security_struct *isec; |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 4855 | struct common_audit_data ad; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 4856 | u32 sid = current_sid(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4857 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4858 | isec = ipc_perms->security; |
| 4859 | |
Eric Paris | 50c205f | 2012-04-04 15:01:43 -0400 | [diff] [blame] | 4860 | ad.type = LSM_AUDIT_DATA_IPC; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4861 | ad.u.ipc_id = ipc_perms->key; |
| 4862 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 4863 | return avc_has_perm(sid, isec->sid, isec->sclass, perms, &ad); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4864 | } |
| 4865 | |
| 4866 | static int selinux_msg_msg_alloc_security(struct msg_msg *msg) |
| 4867 | { |
| 4868 | return msg_msg_alloc_security(msg); |
| 4869 | } |
| 4870 | |
| 4871 | static void selinux_msg_msg_free_security(struct msg_msg *msg) |
| 4872 | { |
| 4873 | msg_msg_free_security(msg); |
| 4874 | } |
| 4875 | |
| 4876 | /* message queue security operations */ |
| 4877 | static int selinux_msg_queue_alloc_security(struct msg_queue *msq) |
| 4878 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4879 | struct ipc_security_struct *isec; |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 4880 | struct common_audit_data ad; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 4881 | u32 sid = current_sid(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4882 | int rc; |
| 4883 | |
| 4884 | rc = ipc_alloc_security(current, &msq->q_perm, SECCLASS_MSGQ); |
| 4885 | if (rc) |
| 4886 | return rc; |
| 4887 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4888 | isec = msq->q_perm.security; |
| 4889 | |
Eric Paris | 50c205f | 2012-04-04 15:01:43 -0400 | [diff] [blame] | 4890 | ad.type = LSM_AUDIT_DATA_IPC; |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 4891 | ad.u.ipc_id = msq->q_perm.key; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4892 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 4893 | rc = avc_has_perm(sid, isec->sid, SECCLASS_MSGQ, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4894 | MSGQ__CREATE, &ad); |
| 4895 | if (rc) { |
| 4896 | ipc_free_security(&msq->q_perm); |
| 4897 | return rc; |
| 4898 | } |
| 4899 | return 0; |
| 4900 | } |
| 4901 | |
| 4902 | static void selinux_msg_queue_free_security(struct msg_queue *msq) |
| 4903 | { |
| 4904 | ipc_free_security(&msq->q_perm); |
| 4905 | } |
| 4906 | |
| 4907 | static int selinux_msg_queue_associate(struct msg_queue *msq, int msqflg) |
| 4908 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4909 | struct ipc_security_struct *isec; |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 4910 | struct common_audit_data ad; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 4911 | u32 sid = current_sid(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4912 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4913 | isec = msq->q_perm.security; |
| 4914 | |
Eric Paris | 50c205f | 2012-04-04 15:01:43 -0400 | [diff] [blame] | 4915 | ad.type = LSM_AUDIT_DATA_IPC; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4916 | ad.u.ipc_id = msq->q_perm.key; |
| 4917 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 4918 | return avc_has_perm(sid, isec->sid, SECCLASS_MSGQ, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4919 | MSGQ__ASSOCIATE, &ad); |
| 4920 | } |
| 4921 | |
| 4922 | static int selinux_msg_queue_msgctl(struct msg_queue *msq, int cmd) |
| 4923 | { |
| 4924 | int err; |
| 4925 | int perms; |
| 4926 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 4927 | switch (cmd) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4928 | case IPC_INFO: |
| 4929 | case MSG_INFO: |
| 4930 | /* No specific object, just general system-wide information. */ |
| 4931 | return task_has_system(current, SYSTEM__IPC_INFO); |
| 4932 | case IPC_STAT: |
| 4933 | case MSG_STAT: |
| 4934 | perms = MSGQ__GETATTR | MSGQ__ASSOCIATE; |
| 4935 | break; |
| 4936 | case IPC_SET: |
| 4937 | perms = MSGQ__SETATTR; |
| 4938 | break; |
| 4939 | case IPC_RMID: |
| 4940 | perms = MSGQ__DESTROY; |
| 4941 | break; |
| 4942 | default: |
| 4943 | return 0; |
| 4944 | } |
| 4945 | |
Stephen Smalley | 6af963f | 2005-05-01 08:58:39 -0700 | [diff] [blame] | 4946 | err = ipc_has_perm(&msq->q_perm, perms); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4947 | return err; |
| 4948 | } |
| 4949 | |
| 4950 | static int selinux_msg_queue_msgsnd(struct msg_queue *msq, struct msg_msg *msg, int msqflg) |
| 4951 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4952 | struct ipc_security_struct *isec; |
| 4953 | struct msg_security_struct *msec; |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 4954 | struct common_audit_data ad; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 4955 | u32 sid = current_sid(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4956 | int rc; |
| 4957 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4958 | isec = msq->q_perm.security; |
| 4959 | msec = msg->security; |
| 4960 | |
| 4961 | /* |
| 4962 | * First time through, need to assign label to the message |
| 4963 | */ |
| 4964 | if (msec->sid == SECINITSID_UNLABELED) { |
| 4965 | /* |
| 4966 | * Compute new sid based on current process and |
| 4967 | * message queue this message will be stored in |
| 4968 | */ |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 4969 | rc = security_transition_sid(sid, isec->sid, SECCLASS_MSG, |
Eric Paris | 652bb9b | 2011-02-01 11:05:40 -0500 | [diff] [blame] | 4970 | NULL, &msec->sid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4971 | if (rc) |
| 4972 | return rc; |
| 4973 | } |
| 4974 | |
Eric Paris | 50c205f | 2012-04-04 15:01:43 -0400 | [diff] [blame] | 4975 | ad.type = LSM_AUDIT_DATA_IPC; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4976 | ad.u.ipc_id = msq->q_perm.key; |
| 4977 | |
| 4978 | /* Can this process write to the queue? */ |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 4979 | rc = avc_has_perm(sid, isec->sid, SECCLASS_MSGQ, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4980 | MSGQ__WRITE, &ad); |
| 4981 | if (!rc) |
| 4982 | /* Can this process send the message */ |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 4983 | rc = avc_has_perm(sid, msec->sid, SECCLASS_MSG, |
| 4984 | MSG__SEND, &ad); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4985 | if (!rc) |
| 4986 | /* Can the message be put in the queue? */ |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 4987 | rc = avc_has_perm(msec->sid, isec->sid, SECCLASS_MSGQ, |
| 4988 | MSGQ__ENQUEUE, &ad); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4989 | |
| 4990 | return rc; |
| 4991 | } |
| 4992 | |
| 4993 | static int selinux_msg_queue_msgrcv(struct msg_queue *msq, struct msg_msg *msg, |
| 4994 | struct task_struct *target, |
| 4995 | long type, int mode) |
| 4996 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4997 | struct ipc_security_struct *isec; |
| 4998 | struct msg_security_struct *msec; |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 4999 | struct common_audit_data ad; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5000 | u32 sid = task_sid(target); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5001 | int rc; |
| 5002 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5003 | isec = msq->q_perm.security; |
| 5004 | msec = msg->security; |
| 5005 | |
Eric Paris | 50c205f | 2012-04-04 15:01:43 -0400 | [diff] [blame] | 5006 | ad.type = LSM_AUDIT_DATA_IPC; |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5007 | ad.u.ipc_id = msq->q_perm.key; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5008 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5009 | rc = avc_has_perm(sid, isec->sid, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5010 | SECCLASS_MSGQ, MSGQ__READ, &ad); |
| 5011 | if (!rc) |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5012 | rc = avc_has_perm(sid, msec->sid, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5013 | SECCLASS_MSG, MSG__RECEIVE, &ad); |
| 5014 | return rc; |
| 5015 | } |
| 5016 | |
| 5017 | /* Shared Memory security operations */ |
| 5018 | static int selinux_shm_alloc_security(struct shmid_kernel *shp) |
| 5019 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5020 | struct ipc_security_struct *isec; |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 5021 | struct common_audit_data ad; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5022 | u32 sid = current_sid(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5023 | int rc; |
| 5024 | |
| 5025 | rc = ipc_alloc_security(current, &shp->shm_perm, SECCLASS_SHM); |
| 5026 | if (rc) |
| 5027 | return rc; |
| 5028 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5029 | isec = shp->shm_perm.security; |
| 5030 | |
Eric Paris | 50c205f | 2012-04-04 15:01:43 -0400 | [diff] [blame] | 5031 | ad.type = LSM_AUDIT_DATA_IPC; |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5032 | ad.u.ipc_id = shp->shm_perm.key; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5033 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5034 | rc = avc_has_perm(sid, isec->sid, SECCLASS_SHM, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5035 | SHM__CREATE, &ad); |
| 5036 | if (rc) { |
| 5037 | ipc_free_security(&shp->shm_perm); |
| 5038 | return rc; |
| 5039 | } |
| 5040 | return 0; |
| 5041 | } |
| 5042 | |
| 5043 | static void selinux_shm_free_security(struct shmid_kernel *shp) |
| 5044 | { |
| 5045 | ipc_free_security(&shp->shm_perm); |
| 5046 | } |
| 5047 | |
| 5048 | static int selinux_shm_associate(struct shmid_kernel *shp, int shmflg) |
| 5049 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5050 | struct ipc_security_struct *isec; |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 5051 | struct common_audit_data ad; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5052 | u32 sid = current_sid(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5053 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5054 | isec = shp->shm_perm.security; |
| 5055 | |
Eric Paris | 50c205f | 2012-04-04 15:01:43 -0400 | [diff] [blame] | 5056 | ad.type = LSM_AUDIT_DATA_IPC; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5057 | ad.u.ipc_id = shp->shm_perm.key; |
| 5058 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5059 | return avc_has_perm(sid, isec->sid, SECCLASS_SHM, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5060 | SHM__ASSOCIATE, &ad); |
| 5061 | } |
| 5062 | |
| 5063 | /* Note, at this point, shp is locked down */ |
| 5064 | static int selinux_shm_shmctl(struct shmid_kernel *shp, int cmd) |
| 5065 | { |
| 5066 | int perms; |
| 5067 | int err; |
| 5068 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5069 | switch (cmd) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5070 | case IPC_INFO: |
| 5071 | case SHM_INFO: |
| 5072 | /* No specific object, just general system-wide information. */ |
| 5073 | return task_has_system(current, SYSTEM__IPC_INFO); |
| 5074 | case IPC_STAT: |
| 5075 | case SHM_STAT: |
| 5076 | perms = SHM__GETATTR | SHM__ASSOCIATE; |
| 5077 | break; |
| 5078 | case IPC_SET: |
| 5079 | perms = SHM__SETATTR; |
| 5080 | break; |
| 5081 | case SHM_LOCK: |
| 5082 | case SHM_UNLOCK: |
| 5083 | perms = SHM__LOCK; |
| 5084 | break; |
| 5085 | case IPC_RMID: |
| 5086 | perms = SHM__DESTROY; |
| 5087 | break; |
| 5088 | default: |
| 5089 | return 0; |
| 5090 | } |
| 5091 | |
Stephen Smalley | 6af963f | 2005-05-01 08:58:39 -0700 | [diff] [blame] | 5092 | err = ipc_has_perm(&shp->shm_perm, perms); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5093 | return err; |
| 5094 | } |
| 5095 | |
| 5096 | static int selinux_shm_shmat(struct shmid_kernel *shp, |
| 5097 | char __user *shmaddr, int shmflg) |
| 5098 | { |
| 5099 | u32 perms; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5100 | |
| 5101 | if (shmflg & SHM_RDONLY) |
| 5102 | perms = SHM__READ; |
| 5103 | else |
| 5104 | perms = SHM__READ | SHM__WRITE; |
| 5105 | |
Stephen Smalley | 6af963f | 2005-05-01 08:58:39 -0700 | [diff] [blame] | 5106 | return ipc_has_perm(&shp->shm_perm, perms); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5107 | } |
| 5108 | |
| 5109 | /* Semaphore security operations */ |
| 5110 | static int selinux_sem_alloc_security(struct sem_array *sma) |
| 5111 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5112 | struct ipc_security_struct *isec; |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 5113 | struct common_audit_data ad; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5114 | u32 sid = current_sid(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5115 | int rc; |
| 5116 | |
| 5117 | rc = ipc_alloc_security(current, &sma->sem_perm, SECCLASS_SEM); |
| 5118 | if (rc) |
| 5119 | return rc; |
| 5120 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5121 | isec = sma->sem_perm.security; |
| 5122 | |
Eric Paris | 50c205f | 2012-04-04 15:01:43 -0400 | [diff] [blame] | 5123 | ad.type = LSM_AUDIT_DATA_IPC; |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5124 | ad.u.ipc_id = sma->sem_perm.key; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5125 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5126 | rc = avc_has_perm(sid, isec->sid, SECCLASS_SEM, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5127 | SEM__CREATE, &ad); |
| 5128 | if (rc) { |
| 5129 | ipc_free_security(&sma->sem_perm); |
| 5130 | return rc; |
| 5131 | } |
| 5132 | return 0; |
| 5133 | } |
| 5134 | |
| 5135 | static void selinux_sem_free_security(struct sem_array *sma) |
| 5136 | { |
| 5137 | ipc_free_security(&sma->sem_perm); |
| 5138 | } |
| 5139 | |
| 5140 | static int selinux_sem_associate(struct sem_array *sma, int semflg) |
| 5141 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5142 | struct ipc_security_struct *isec; |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 5143 | struct common_audit_data ad; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5144 | u32 sid = current_sid(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5145 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5146 | isec = sma->sem_perm.security; |
| 5147 | |
Eric Paris | 50c205f | 2012-04-04 15:01:43 -0400 | [diff] [blame] | 5148 | ad.type = LSM_AUDIT_DATA_IPC; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5149 | ad.u.ipc_id = sma->sem_perm.key; |
| 5150 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5151 | return avc_has_perm(sid, isec->sid, SECCLASS_SEM, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5152 | SEM__ASSOCIATE, &ad); |
| 5153 | } |
| 5154 | |
| 5155 | /* Note, at this point, sma is locked down */ |
| 5156 | static int selinux_sem_semctl(struct sem_array *sma, int cmd) |
| 5157 | { |
| 5158 | int err; |
| 5159 | u32 perms; |
| 5160 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5161 | switch (cmd) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5162 | case IPC_INFO: |
| 5163 | case SEM_INFO: |
| 5164 | /* No specific object, just general system-wide information. */ |
| 5165 | return task_has_system(current, SYSTEM__IPC_INFO); |
| 5166 | case GETPID: |
| 5167 | case GETNCNT: |
| 5168 | case GETZCNT: |
| 5169 | perms = SEM__GETATTR; |
| 5170 | break; |
| 5171 | case GETVAL: |
| 5172 | case GETALL: |
| 5173 | perms = SEM__READ; |
| 5174 | break; |
| 5175 | case SETVAL: |
| 5176 | case SETALL: |
| 5177 | perms = SEM__WRITE; |
| 5178 | break; |
| 5179 | case IPC_RMID: |
| 5180 | perms = SEM__DESTROY; |
| 5181 | break; |
| 5182 | case IPC_SET: |
| 5183 | perms = SEM__SETATTR; |
| 5184 | break; |
| 5185 | case IPC_STAT: |
| 5186 | case SEM_STAT: |
| 5187 | perms = SEM__GETATTR | SEM__ASSOCIATE; |
| 5188 | break; |
| 5189 | default: |
| 5190 | return 0; |
| 5191 | } |
| 5192 | |
Stephen Smalley | 6af963f | 2005-05-01 08:58:39 -0700 | [diff] [blame] | 5193 | err = ipc_has_perm(&sma->sem_perm, perms); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5194 | return err; |
| 5195 | } |
| 5196 | |
| 5197 | static int selinux_sem_semop(struct sem_array *sma, |
| 5198 | struct sembuf *sops, unsigned nsops, int alter) |
| 5199 | { |
| 5200 | u32 perms; |
| 5201 | |
| 5202 | if (alter) |
| 5203 | perms = SEM__READ | SEM__WRITE; |
| 5204 | else |
| 5205 | perms = SEM__READ; |
| 5206 | |
Stephen Smalley | 6af963f | 2005-05-01 08:58:39 -0700 | [diff] [blame] | 5207 | return ipc_has_perm(&sma->sem_perm, perms); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5208 | } |
| 5209 | |
| 5210 | static int selinux_ipc_permission(struct kern_ipc_perm *ipcp, short flag) |
| 5211 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5212 | u32 av = 0; |
| 5213 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5214 | av = 0; |
| 5215 | if (flag & S_IRUGO) |
| 5216 | av |= IPC__UNIX_READ; |
| 5217 | if (flag & S_IWUGO) |
| 5218 | av |= IPC__UNIX_WRITE; |
| 5219 | |
| 5220 | if (av == 0) |
| 5221 | return 0; |
| 5222 | |
Stephen Smalley | 6af963f | 2005-05-01 08:58:39 -0700 | [diff] [blame] | 5223 | return ipc_has_perm(ipcp, av); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5224 | } |
| 5225 | |
Ahmed S. Darwish | 713a04ae | 2008-03-01 21:52:30 +0200 | [diff] [blame] | 5226 | static void selinux_ipc_getsecid(struct kern_ipc_perm *ipcp, u32 *secid) |
| 5227 | { |
| 5228 | struct ipc_security_struct *isec = ipcp->security; |
| 5229 | *secid = isec->sid; |
| 5230 | } |
| 5231 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5232 | static void selinux_d_instantiate(struct dentry *dentry, struct inode *inode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5233 | { |
| 5234 | if (inode) |
| 5235 | inode_doinit_with_dentry(inode, dentry); |
| 5236 | } |
| 5237 | |
| 5238 | static int selinux_getprocattr(struct task_struct *p, |
Al Viro | 04ff970 | 2007-03-12 16:17:58 +0000 | [diff] [blame] | 5239 | char *name, char **value) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5240 | { |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5241 | const struct task_security_struct *__tsec; |
Dustin Kirkland | 8c8570f | 2005-11-03 17:15:16 +0000 | [diff] [blame] | 5242 | u32 sid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5243 | int error; |
Al Viro | 04ff970 | 2007-03-12 16:17:58 +0000 | [diff] [blame] | 5244 | unsigned len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5245 | |
| 5246 | if (current != p) { |
David Howells | 3b11a1d | 2008-11-14 10:39:26 +1100 | [diff] [blame] | 5247 | error = current_has_perm(p, PROCESS__GETATTR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5248 | if (error) |
| 5249 | return error; |
| 5250 | } |
| 5251 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5252 | rcu_read_lock(); |
| 5253 | __tsec = __task_cred(p)->security; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5254 | |
| 5255 | if (!strcmp(name, "current")) |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5256 | sid = __tsec->sid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5257 | else if (!strcmp(name, "prev")) |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5258 | sid = __tsec->osid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5259 | else if (!strcmp(name, "exec")) |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5260 | sid = __tsec->exec_sid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5261 | else if (!strcmp(name, "fscreate")) |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5262 | sid = __tsec->create_sid; |
Michael LeMay | 4eb582c | 2006-06-26 00:24:57 -0700 | [diff] [blame] | 5263 | else if (!strcmp(name, "keycreate")) |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5264 | sid = __tsec->keycreate_sid; |
Eric Paris | 42c3e03 | 2006-06-26 00:26:03 -0700 | [diff] [blame] | 5265 | else if (!strcmp(name, "sockcreate")) |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5266 | sid = __tsec->sockcreate_sid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5267 | else |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5268 | goto invalid; |
| 5269 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5270 | |
| 5271 | if (!sid) |
| 5272 | return 0; |
| 5273 | |
Al Viro | 04ff970 | 2007-03-12 16:17:58 +0000 | [diff] [blame] | 5274 | error = security_sid_to_context(sid, value, &len); |
| 5275 | if (error) |
| 5276 | return error; |
| 5277 | return len; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5278 | |
| 5279 | invalid: |
| 5280 | rcu_read_unlock(); |
| 5281 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5282 | } |
| 5283 | |
| 5284 | static int selinux_setprocattr(struct task_struct *p, |
| 5285 | char *name, void *value, size_t size) |
| 5286 | { |
| 5287 | struct task_security_struct *tsec; |
Roland McGrath | 0356357 | 2008-03-26 15:46:39 -0700 | [diff] [blame] | 5288 | struct task_struct *tracer; |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 5289 | struct cred *new; |
| 5290 | u32 sid = 0, ptsid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5291 | int error; |
| 5292 | char *str = value; |
| 5293 | |
| 5294 | if (current != p) { |
| 5295 | /* SELinux only allows a process to change its own |
| 5296 | security attributes. */ |
| 5297 | return -EACCES; |
| 5298 | } |
| 5299 | |
| 5300 | /* |
| 5301 | * Basic control over ability to set these attributes at all. |
| 5302 | * current == p, but we'll pass them separately in case the |
| 5303 | * above restriction is ever removed. |
| 5304 | */ |
| 5305 | if (!strcmp(name, "exec")) |
David Howells | 3b11a1d | 2008-11-14 10:39:26 +1100 | [diff] [blame] | 5306 | error = current_has_perm(p, PROCESS__SETEXEC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5307 | else if (!strcmp(name, "fscreate")) |
David Howells | 3b11a1d | 2008-11-14 10:39:26 +1100 | [diff] [blame] | 5308 | error = current_has_perm(p, PROCESS__SETFSCREATE); |
Michael LeMay | 4eb582c | 2006-06-26 00:24:57 -0700 | [diff] [blame] | 5309 | else if (!strcmp(name, "keycreate")) |
David Howells | 3b11a1d | 2008-11-14 10:39:26 +1100 | [diff] [blame] | 5310 | error = current_has_perm(p, PROCESS__SETKEYCREATE); |
Eric Paris | 42c3e03 | 2006-06-26 00:26:03 -0700 | [diff] [blame] | 5311 | else if (!strcmp(name, "sockcreate")) |
David Howells | 3b11a1d | 2008-11-14 10:39:26 +1100 | [diff] [blame] | 5312 | error = current_has_perm(p, PROCESS__SETSOCKCREATE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5313 | else if (!strcmp(name, "current")) |
David Howells | 3b11a1d | 2008-11-14 10:39:26 +1100 | [diff] [blame] | 5314 | error = current_has_perm(p, PROCESS__SETCURRENT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5315 | else |
| 5316 | error = -EINVAL; |
| 5317 | if (error) |
| 5318 | return error; |
| 5319 | |
| 5320 | /* Obtain a SID for the context, if one was specified. */ |
| 5321 | if (size && str[1] && str[1] != '\n') { |
| 5322 | if (str[size-1] == '\n') { |
| 5323 | str[size-1] = 0; |
| 5324 | size--; |
| 5325 | } |
| 5326 | error = security_context_to_sid(value, size, &sid); |
Stephen Smalley | 12b29f3 | 2008-05-07 13:03:20 -0400 | [diff] [blame] | 5327 | if (error == -EINVAL && !strcmp(name, "fscreate")) { |
Eric Paris | d6ea83e | 2012-04-04 13:45:49 -0400 | [diff] [blame] | 5328 | if (!capable(CAP_MAC_ADMIN)) { |
| 5329 | struct audit_buffer *ab; |
| 5330 | size_t audit_size; |
| 5331 | |
| 5332 | /* We strip a nul only if it is at the end, otherwise the |
| 5333 | * context contains a nul and we should audit that */ |
| 5334 | if (str[size - 1] == '\0') |
| 5335 | audit_size = size - 1; |
| 5336 | else |
| 5337 | audit_size = size; |
| 5338 | ab = audit_log_start(current->audit_context, GFP_ATOMIC, AUDIT_SELINUX_ERR); |
| 5339 | audit_log_format(ab, "op=fscreate invalid_context="); |
| 5340 | audit_log_n_untrustedstring(ab, value, audit_size); |
| 5341 | audit_log_end(ab); |
| 5342 | |
Stephen Smalley | 12b29f3 | 2008-05-07 13:03:20 -0400 | [diff] [blame] | 5343 | return error; |
Eric Paris | d6ea83e | 2012-04-04 13:45:49 -0400 | [diff] [blame] | 5344 | } |
Stephen Smalley | 12b29f3 | 2008-05-07 13:03:20 -0400 | [diff] [blame] | 5345 | error = security_context_to_sid_force(value, size, |
| 5346 | &sid); |
| 5347 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5348 | if (error) |
| 5349 | return error; |
| 5350 | } |
| 5351 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 5352 | new = prepare_creds(); |
| 5353 | if (!new) |
| 5354 | return -ENOMEM; |
| 5355 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5356 | /* Permission checking based on the specified context is |
| 5357 | performed during the actual operation (execve, |
| 5358 | open/mkdir/...), when we know the full context of the |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 5359 | operation. See selinux_bprm_set_creds for the execve |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5360 | checks and may_create for the file creation checks. The |
| 5361 | operation will then fail if the context is not permitted. */ |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 5362 | tsec = new->security; |
| 5363 | if (!strcmp(name, "exec")) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5364 | tsec->exec_sid = sid; |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 5365 | } else if (!strcmp(name, "fscreate")) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5366 | tsec->create_sid = sid; |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 5367 | } else if (!strcmp(name, "keycreate")) { |
Michael LeMay | 4eb582c | 2006-06-26 00:24:57 -0700 | [diff] [blame] | 5368 | error = may_create_key(sid, p); |
| 5369 | if (error) |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 5370 | goto abort_change; |
Michael LeMay | 4eb582c | 2006-06-26 00:24:57 -0700 | [diff] [blame] | 5371 | tsec->keycreate_sid = sid; |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 5372 | } else if (!strcmp(name, "sockcreate")) { |
Eric Paris | 42c3e03 | 2006-06-26 00:26:03 -0700 | [diff] [blame] | 5373 | tsec->sockcreate_sid = sid; |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 5374 | } else if (!strcmp(name, "current")) { |
| 5375 | error = -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5376 | if (sid == 0) |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 5377 | goto abort_change; |
KaiGai Kohei | d9250de | 2008-08-28 16:35:57 +0900 | [diff] [blame] | 5378 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 5379 | /* Only allow single threaded processes to change context */ |
| 5380 | error = -EPERM; |
Oleg Nesterov | 5bb459b | 2009-07-10 03:48:23 +0200 | [diff] [blame] | 5381 | if (!current_is_single_threaded()) { |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 5382 | error = security_bounded_transition(tsec->sid, sid); |
| 5383 | if (error) |
| 5384 | goto abort_change; |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5385 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5386 | |
| 5387 | /* Check permissions for the transition. */ |
| 5388 | error = avc_has_perm(tsec->sid, sid, SECCLASS_PROCESS, |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5389 | PROCESS__DYNTRANSITION, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5390 | if (error) |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 5391 | goto abort_change; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5392 | |
| 5393 | /* Check for ptracing, and update the task SID if ok. |
| 5394 | Otherwise, leave SID unchanged and fail. */ |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 5395 | ptsid = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5396 | task_lock(p); |
Tejun Heo | 06d9847 | 2011-06-17 16:50:40 +0200 | [diff] [blame] | 5397 | tracer = ptrace_parent(p); |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 5398 | if (tracer) |
| 5399 | ptsid = task_sid(tracer); |
| 5400 | task_unlock(p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5401 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 5402 | if (tracer) { |
| 5403 | error = avc_has_perm(ptsid, sid, SECCLASS_PROCESS, |
| 5404 | PROCESS__PTRACE, NULL); |
| 5405 | if (error) |
| 5406 | goto abort_change; |
| 5407 | } |
| 5408 | |
| 5409 | tsec->sid = sid; |
| 5410 | } else { |
| 5411 | error = -EINVAL; |
| 5412 | goto abort_change; |
| 5413 | } |
| 5414 | |
| 5415 | commit_creds(new); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5416 | return size; |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 5417 | |
| 5418 | abort_change: |
| 5419 | abort_creds(new); |
| 5420 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5421 | } |
| 5422 | |
Catherine Zhang | dc49c1f | 2006-08-02 14:12:06 -0700 | [diff] [blame] | 5423 | static int selinux_secid_to_secctx(u32 secid, char **secdata, u32 *seclen) |
| 5424 | { |
| 5425 | return security_sid_to_context(secid, secdata, seclen); |
| 5426 | } |
| 5427 | |
David Howells | 7bf570d | 2008-04-29 20:52:51 +0100 | [diff] [blame] | 5428 | 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] | 5429 | { |
| 5430 | return security_context_to_sid(secdata, seclen, secid); |
| 5431 | } |
| 5432 | |
Catherine Zhang | dc49c1f | 2006-08-02 14:12:06 -0700 | [diff] [blame] | 5433 | static void selinux_release_secctx(char *secdata, u32 seclen) |
| 5434 | { |
Paul Moore | 088999e | 2007-08-01 11:12:58 -0400 | [diff] [blame] | 5435 | kfree(secdata); |
Catherine Zhang | dc49c1f | 2006-08-02 14:12:06 -0700 | [diff] [blame] | 5436 | } |
| 5437 | |
David P. Quigley | 1ee65e3 | 2009-09-03 14:25:57 -0400 | [diff] [blame] | 5438 | /* |
| 5439 | * called with inode->i_mutex locked |
| 5440 | */ |
| 5441 | static int selinux_inode_notifysecctx(struct inode *inode, void *ctx, u32 ctxlen) |
| 5442 | { |
| 5443 | return selinux_inode_setsecurity(inode, XATTR_SELINUX_SUFFIX, ctx, ctxlen, 0); |
| 5444 | } |
| 5445 | |
| 5446 | /* |
| 5447 | * called with inode->i_mutex locked |
| 5448 | */ |
| 5449 | static int selinux_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen) |
| 5450 | { |
| 5451 | return __vfs_setxattr_noperm(dentry, XATTR_NAME_SELINUX, ctx, ctxlen, 0); |
| 5452 | } |
| 5453 | |
| 5454 | static int selinux_inode_getsecctx(struct inode *inode, void **ctx, u32 *ctxlen) |
| 5455 | { |
| 5456 | int len = 0; |
| 5457 | len = selinux_inode_getsecurity(inode, XATTR_SELINUX_SUFFIX, |
| 5458 | ctx, true); |
| 5459 | if (len < 0) |
| 5460 | return len; |
| 5461 | *ctxlen = len; |
| 5462 | return 0; |
| 5463 | } |
Michael LeMay | d720024 | 2006-06-22 14:47:17 -0700 | [diff] [blame] | 5464 | #ifdef CONFIG_KEYS |
| 5465 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 5466 | static int selinux_key_alloc(struct key *k, const struct cred *cred, |
David Howells | 7e047ef | 2006-06-26 00:24:50 -0700 | [diff] [blame] | 5467 | unsigned long flags) |
Michael LeMay | d720024 | 2006-06-22 14:47:17 -0700 | [diff] [blame] | 5468 | { |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 5469 | const struct task_security_struct *tsec; |
Michael LeMay | d720024 | 2006-06-22 14:47:17 -0700 | [diff] [blame] | 5470 | struct key_security_struct *ksec; |
| 5471 | |
| 5472 | ksec = kzalloc(sizeof(struct key_security_struct), GFP_KERNEL); |
| 5473 | if (!ksec) |
| 5474 | return -ENOMEM; |
| 5475 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 5476 | tsec = cred->security; |
| 5477 | if (tsec->keycreate_sid) |
| 5478 | ksec->sid = tsec->keycreate_sid; |
Michael LeMay | 4eb582c | 2006-06-26 00:24:57 -0700 | [diff] [blame] | 5479 | else |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 5480 | ksec->sid = tsec->sid; |
Michael LeMay | d720024 | 2006-06-22 14:47:17 -0700 | [diff] [blame] | 5481 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5482 | k->security = ksec; |
Michael LeMay | d720024 | 2006-06-22 14:47:17 -0700 | [diff] [blame] | 5483 | return 0; |
| 5484 | } |
| 5485 | |
| 5486 | static void selinux_key_free(struct key *k) |
| 5487 | { |
| 5488 | struct key_security_struct *ksec = k->security; |
| 5489 | |
| 5490 | k->security = NULL; |
| 5491 | kfree(ksec); |
| 5492 | } |
| 5493 | |
| 5494 | static int selinux_key_permission(key_ref_t key_ref, |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 5495 | const struct cred *cred, |
| 5496 | key_perm_t perm) |
Michael LeMay | d720024 | 2006-06-22 14:47:17 -0700 | [diff] [blame] | 5497 | { |
| 5498 | struct key *key; |
Michael LeMay | d720024 | 2006-06-22 14:47:17 -0700 | [diff] [blame] | 5499 | struct key_security_struct *ksec; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5500 | u32 sid; |
Michael LeMay | d720024 | 2006-06-22 14:47:17 -0700 | [diff] [blame] | 5501 | |
| 5502 | /* if no specific permissions are requested, we skip the |
| 5503 | permission check. No serious, additional covert channels |
| 5504 | appear to be created. */ |
| 5505 | if (perm == 0) |
| 5506 | return 0; |
| 5507 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 5508 | sid = cred_sid(cred); |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5509 | |
| 5510 | key = key_ref_to_ptr(key_ref); |
| 5511 | ksec = key->security; |
| 5512 | |
| 5513 | return avc_has_perm(sid, ksec->sid, SECCLASS_KEY, perm, NULL); |
Michael LeMay | d720024 | 2006-06-22 14:47:17 -0700 | [diff] [blame] | 5514 | } |
| 5515 | |
David Howells | 70a5bb7 | 2008-04-29 01:01:26 -0700 | [diff] [blame] | 5516 | static int selinux_key_getsecurity(struct key *key, char **_buffer) |
| 5517 | { |
| 5518 | struct key_security_struct *ksec = key->security; |
| 5519 | char *context = NULL; |
| 5520 | unsigned len; |
| 5521 | int rc; |
| 5522 | |
| 5523 | rc = security_sid_to_context(ksec->sid, &context, &len); |
| 5524 | if (!rc) |
| 5525 | rc = len; |
| 5526 | *_buffer = context; |
| 5527 | return rc; |
| 5528 | } |
| 5529 | |
Michael LeMay | d720024 | 2006-06-22 14:47:17 -0700 | [diff] [blame] | 5530 | #endif |
| 5531 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5532 | static struct security_operations selinux_ops = { |
Ahmed S. Darwish | 076c54c | 2008-03-06 18:09:10 +0200 | [diff] [blame] | 5533 | .name = "selinux", |
| 5534 | |
Ingo Molnar | 9e48858 | 2009-05-07 19:26:19 +1000 | [diff] [blame] | 5535 | .ptrace_access_check = selinux_ptrace_access_check, |
David Howells | 5cd9c58 | 2008-08-14 11:37:28 +0100 | [diff] [blame] | 5536 | .ptrace_traceme = selinux_ptrace_traceme, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5537 | .capget = selinux_capget, |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 5538 | .capset = selinux_capset, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5539 | .capable = selinux_capable, |
| 5540 | .quotactl = selinux_quotactl, |
| 5541 | .quota_on = selinux_quota_on, |
| 5542 | .syslog = selinux_syslog, |
| 5543 | .vm_enough_memory = selinux_vm_enough_memory, |
| 5544 | |
| 5545 | .netlink_send = selinux_netlink_send, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5546 | |
David Howells | a6f76f2 | 2008-11-14 10:39:24 +1100 | [diff] [blame] | 5547 | .bprm_set_creds = selinux_bprm_set_creds, |
David Howells | a6f76f2 | 2008-11-14 10:39:24 +1100 | [diff] [blame] | 5548 | .bprm_committing_creds = selinux_bprm_committing_creds, |
| 5549 | .bprm_committed_creds = selinux_bprm_committed_creds, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5550 | .bprm_secureexec = selinux_bprm_secureexec, |
| 5551 | |
| 5552 | .sb_alloc_security = selinux_sb_alloc_security, |
| 5553 | .sb_free_security = selinux_sb_free_security, |
| 5554 | .sb_copy_data = selinux_sb_copy_data, |
Eric Paris | 026eb16 | 2011-03-03 16:09:14 -0500 | [diff] [blame] | 5555 | .sb_remount = selinux_sb_remount, |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5556 | .sb_kern_mount = selinux_sb_kern_mount, |
Eric Paris | 2069f45 | 2008-07-04 09:47:13 +1000 | [diff] [blame] | 5557 | .sb_show_options = selinux_sb_show_options, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5558 | .sb_statfs = selinux_sb_statfs, |
| 5559 | .sb_mount = selinux_mount, |
| 5560 | .sb_umount = selinux_umount, |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 5561 | .sb_set_mnt_opts = selinux_set_mnt_opts, |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5562 | .sb_clone_mnt_opts = selinux_sb_clone_mnt_opts, |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 5563 | .sb_parse_opts_str = selinux_parse_opts_str, |
| 5564 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5565 | |
| 5566 | .inode_alloc_security = selinux_inode_alloc_security, |
| 5567 | .inode_free_security = selinux_inode_free_security, |
Stephen Smalley | 5e41ff9 | 2005-09-09 13:01:35 -0700 | [diff] [blame] | 5568 | .inode_init_security = selinux_inode_init_security, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5569 | .inode_create = selinux_inode_create, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5570 | .inode_link = selinux_inode_link, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5571 | .inode_unlink = selinux_inode_unlink, |
| 5572 | .inode_symlink = selinux_inode_symlink, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5573 | .inode_mkdir = selinux_inode_mkdir, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5574 | .inode_rmdir = selinux_inode_rmdir, |
| 5575 | .inode_mknod = selinux_inode_mknod, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5576 | .inode_rename = selinux_inode_rename, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5577 | .inode_readlink = selinux_inode_readlink, |
| 5578 | .inode_follow_link = selinux_inode_follow_link, |
| 5579 | .inode_permission = selinux_inode_permission, |
| 5580 | .inode_setattr = selinux_inode_setattr, |
| 5581 | .inode_getattr = selinux_inode_getattr, |
| 5582 | .inode_setxattr = selinux_inode_setxattr, |
| 5583 | .inode_post_setxattr = selinux_inode_post_setxattr, |
| 5584 | .inode_getxattr = selinux_inode_getxattr, |
| 5585 | .inode_listxattr = selinux_inode_listxattr, |
| 5586 | .inode_removexattr = selinux_inode_removexattr, |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5587 | .inode_getsecurity = selinux_inode_getsecurity, |
| 5588 | .inode_setsecurity = selinux_inode_setsecurity, |
| 5589 | .inode_listsecurity = selinux_inode_listsecurity, |
Eric Paris | f526971 | 2008-05-14 11:27:45 -0400 | [diff] [blame] | 5590 | .inode_getsecid = selinux_inode_getsecid, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5591 | |
| 5592 | .file_permission = selinux_file_permission, |
| 5593 | .file_alloc_security = selinux_file_alloc_security, |
| 5594 | .file_free_security = selinux_file_free_security, |
| 5595 | .file_ioctl = selinux_file_ioctl, |
Al Viro | e546785 | 2012-05-30 13:30:51 -0400 | [diff] [blame] | 5596 | .mmap_file = selinux_mmap_file, |
| 5597 | .mmap_addr = selinux_mmap_addr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5598 | .file_mprotect = selinux_file_mprotect, |
| 5599 | .file_lock = selinux_file_lock, |
| 5600 | .file_fcntl = selinux_file_fcntl, |
| 5601 | .file_set_fowner = selinux_file_set_fowner, |
| 5602 | .file_send_sigiotask = selinux_file_send_sigiotask, |
| 5603 | .file_receive = selinux_file_receive, |
| 5604 | |
Eric Paris | 83d4985 | 2012-04-04 13:45:40 -0400 | [diff] [blame] | 5605 | .file_open = selinux_file_open, |
Yuichi Nakamura | 788e7dd | 2007-09-14 09:27:07 +0900 | [diff] [blame] | 5606 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5607 | .task_create = selinux_task_create, |
David Howells | ee18d64 | 2009-09-02 09:14:21 +0100 | [diff] [blame] | 5608 | .cred_alloc_blank = selinux_cred_alloc_blank, |
David Howells | f1752ee | 2008-11-14 10:39:17 +1100 | [diff] [blame] | 5609 | .cred_free = selinux_cred_free, |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 5610 | .cred_prepare = selinux_cred_prepare, |
David Howells | ee18d64 | 2009-09-02 09:14:21 +0100 | [diff] [blame] | 5611 | .cred_transfer = selinux_cred_transfer, |
David Howells | 3a3b7ce | 2008-11-14 10:39:28 +1100 | [diff] [blame] | 5612 | .kernel_act_as = selinux_kernel_act_as, |
| 5613 | .kernel_create_files_as = selinux_kernel_create_files_as, |
Eric Paris | 25354c4 | 2009-08-13 09:45:03 -0400 | [diff] [blame] | 5614 | .kernel_module_request = selinux_kernel_module_request, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5615 | .task_setpgid = selinux_task_setpgid, |
| 5616 | .task_getpgid = selinux_task_getpgid, |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5617 | .task_getsid = selinux_task_getsid, |
David Quigley | f9008e4 | 2006-06-30 01:55:46 -0700 | [diff] [blame] | 5618 | .task_getsecid = selinux_task_getsecid, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5619 | .task_setnice = selinux_task_setnice, |
James Morris | 03e6806 | 2006-06-23 02:03:58 -0700 | [diff] [blame] | 5620 | .task_setioprio = selinux_task_setioprio, |
David Quigley | a1836a4 | 2006-06-30 01:55:49 -0700 | [diff] [blame] | 5621 | .task_getioprio = selinux_task_getioprio, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5622 | .task_setrlimit = selinux_task_setrlimit, |
| 5623 | .task_setscheduler = selinux_task_setscheduler, |
| 5624 | .task_getscheduler = selinux_task_getscheduler, |
David Quigley | 3560154 | 2006-06-23 02:04:01 -0700 | [diff] [blame] | 5625 | .task_movememory = selinux_task_movememory, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5626 | .task_kill = selinux_task_kill, |
| 5627 | .task_wait = selinux_task_wait, |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5628 | .task_to_inode = selinux_task_to_inode, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5629 | |
| 5630 | .ipc_permission = selinux_ipc_permission, |
Eric Paris | f526971 | 2008-05-14 11:27:45 -0400 | [diff] [blame] | 5631 | .ipc_getsecid = selinux_ipc_getsecid, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5632 | |
| 5633 | .msg_msg_alloc_security = selinux_msg_msg_alloc_security, |
| 5634 | .msg_msg_free_security = selinux_msg_msg_free_security, |
| 5635 | |
| 5636 | .msg_queue_alloc_security = selinux_msg_queue_alloc_security, |
| 5637 | .msg_queue_free_security = selinux_msg_queue_free_security, |
| 5638 | .msg_queue_associate = selinux_msg_queue_associate, |
| 5639 | .msg_queue_msgctl = selinux_msg_queue_msgctl, |
| 5640 | .msg_queue_msgsnd = selinux_msg_queue_msgsnd, |
| 5641 | .msg_queue_msgrcv = selinux_msg_queue_msgrcv, |
| 5642 | |
| 5643 | .shm_alloc_security = selinux_shm_alloc_security, |
| 5644 | .shm_free_security = selinux_shm_free_security, |
| 5645 | .shm_associate = selinux_shm_associate, |
| 5646 | .shm_shmctl = selinux_shm_shmctl, |
| 5647 | .shm_shmat = selinux_shm_shmat, |
| 5648 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5649 | .sem_alloc_security = selinux_sem_alloc_security, |
| 5650 | .sem_free_security = selinux_sem_free_security, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5651 | .sem_associate = selinux_sem_associate, |
| 5652 | .sem_semctl = selinux_sem_semctl, |
| 5653 | .sem_semop = selinux_sem_semop, |
| 5654 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5655 | .d_instantiate = selinux_d_instantiate, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5656 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5657 | .getprocattr = selinux_getprocattr, |
| 5658 | .setprocattr = selinux_setprocattr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5659 | |
Catherine Zhang | dc49c1f | 2006-08-02 14:12:06 -0700 | [diff] [blame] | 5660 | .secid_to_secctx = selinux_secid_to_secctx, |
David Howells | 63cb344 | 2008-01-15 23:47:35 +0000 | [diff] [blame] | 5661 | .secctx_to_secid = selinux_secctx_to_secid, |
Catherine Zhang | dc49c1f | 2006-08-02 14:12:06 -0700 | [diff] [blame] | 5662 | .release_secctx = selinux_release_secctx, |
David P. Quigley | 1ee65e3 | 2009-09-03 14:25:57 -0400 | [diff] [blame] | 5663 | .inode_notifysecctx = selinux_inode_notifysecctx, |
| 5664 | .inode_setsecctx = selinux_inode_setsecctx, |
| 5665 | .inode_getsecctx = selinux_inode_getsecctx, |
Catherine Zhang | dc49c1f | 2006-08-02 14:12:06 -0700 | [diff] [blame] | 5666 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5667 | .unix_stream_connect = selinux_socket_unix_stream_connect, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5668 | .unix_may_send = selinux_socket_unix_may_send, |
| 5669 | |
| 5670 | .socket_create = selinux_socket_create, |
| 5671 | .socket_post_create = selinux_socket_post_create, |
| 5672 | .socket_bind = selinux_socket_bind, |
| 5673 | .socket_connect = selinux_socket_connect, |
| 5674 | .socket_listen = selinux_socket_listen, |
| 5675 | .socket_accept = selinux_socket_accept, |
| 5676 | .socket_sendmsg = selinux_socket_sendmsg, |
| 5677 | .socket_recvmsg = selinux_socket_recvmsg, |
| 5678 | .socket_getsockname = selinux_socket_getsockname, |
| 5679 | .socket_getpeername = selinux_socket_getpeername, |
| 5680 | .socket_getsockopt = selinux_socket_getsockopt, |
| 5681 | .socket_setsockopt = selinux_socket_setsockopt, |
| 5682 | .socket_shutdown = selinux_socket_shutdown, |
| 5683 | .socket_sock_rcv_skb = selinux_socket_sock_rcv_skb, |
Catherine Zhang | 2c7946a | 2006-03-20 22:41:23 -0800 | [diff] [blame] | 5684 | .socket_getpeersec_stream = selinux_socket_getpeersec_stream, |
| 5685 | .socket_getpeersec_dgram = selinux_socket_getpeersec_dgram, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5686 | .sk_alloc_security = selinux_sk_alloc_security, |
| 5687 | .sk_free_security = selinux_sk_free_security, |
Venkat Yekkirala | 892c141 | 2006-08-04 23:08:56 -0700 | [diff] [blame] | 5688 | .sk_clone_security = selinux_sk_clone_security, |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5689 | .sk_getsecid = selinux_sk_getsecid, |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 5690 | .sock_graft = selinux_sock_graft, |
| 5691 | .inet_conn_request = selinux_inet_conn_request, |
| 5692 | .inet_csk_clone = selinux_inet_csk_clone, |
Venkat Yekkirala | 6b87769 | 2006-11-08 17:04:09 -0600 | [diff] [blame] | 5693 | .inet_conn_established = selinux_inet_conn_established, |
Eric Paris | 2606fd1 | 2010-10-13 16:24:41 -0400 | [diff] [blame] | 5694 | .secmark_relabel_packet = selinux_secmark_relabel_packet, |
| 5695 | .secmark_refcount_inc = selinux_secmark_refcount_inc, |
| 5696 | .secmark_refcount_dec = selinux_secmark_refcount_dec, |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 5697 | .req_classify_flow = selinux_req_classify_flow, |
Paul Moore | 5dbbaf2 | 2013-01-14 07:12:19 +0000 | [diff] [blame] | 5698 | .tun_dev_alloc_security = selinux_tun_dev_alloc_security, |
| 5699 | .tun_dev_free_security = selinux_tun_dev_free_security, |
Paul Moore | ed6d76e | 2009-08-28 18:12:49 -0400 | [diff] [blame] | 5700 | .tun_dev_create = selinux_tun_dev_create, |
Paul Moore | 5dbbaf2 | 2013-01-14 07:12:19 +0000 | [diff] [blame] | 5701 | .tun_dev_attach_queue = selinux_tun_dev_attach_queue, |
Paul Moore | ed6d76e | 2009-08-28 18:12:49 -0400 | [diff] [blame] | 5702 | .tun_dev_attach = selinux_tun_dev_attach, |
Paul Moore | 5dbbaf2 | 2013-01-14 07:12:19 +0000 | [diff] [blame] | 5703 | .tun_dev_open = selinux_tun_dev_open, |
Eric Dumazet | ca10b9e | 2013-04-08 17:58:11 +0000 | [diff] [blame] | 5704 | .skb_owned_by = selinux_skb_owned_by, |
Trent Jaeger | d28d1e0 | 2005-12-13 23:12:40 -0800 | [diff] [blame] | 5705 | |
| 5706 | #ifdef CONFIG_SECURITY_NETWORK_XFRM |
| 5707 | .xfrm_policy_alloc_security = selinux_xfrm_policy_alloc, |
| 5708 | .xfrm_policy_clone_security = selinux_xfrm_policy_clone, |
| 5709 | .xfrm_policy_free_security = selinux_xfrm_policy_free, |
Catherine Zhang | c8c05a8 | 2006-06-08 23:39:49 -0700 | [diff] [blame] | 5710 | .xfrm_policy_delete_security = selinux_xfrm_policy_delete, |
Trent Jaeger | d28d1e0 | 2005-12-13 23:12:40 -0800 | [diff] [blame] | 5711 | .xfrm_state_alloc_security = selinux_xfrm_state_alloc, |
| 5712 | .xfrm_state_free_security = selinux_xfrm_state_free, |
Catherine Zhang | c8c05a8 | 2006-06-08 23:39:49 -0700 | [diff] [blame] | 5713 | .xfrm_state_delete_security = selinux_xfrm_state_delete, |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5714 | .xfrm_policy_lookup = selinux_xfrm_policy_lookup, |
Venkat Yekkirala | e0d1caa | 2006-07-24 23:29:07 -0700 | [diff] [blame] | 5715 | .xfrm_state_pol_flow_match = selinux_xfrm_state_pol_flow_match, |
Venkat Yekkirala | e0d1caa | 2006-07-24 23:29:07 -0700 | [diff] [blame] | 5716 | .xfrm_decode_session = selinux_xfrm_decode_session, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5717 | #endif |
Michael LeMay | d720024 | 2006-06-22 14:47:17 -0700 | [diff] [blame] | 5718 | |
| 5719 | #ifdef CONFIG_KEYS |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5720 | .key_alloc = selinux_key_alloc, |
| 5721 | .key_free = selinux_key_free, |
| 5722 | .key_permission = selinux_key_permission, |
David Howells | 70a5bb7 | 2008-04-29 01:01:26 -0700 | [diff] [blame] | 5723 | .key_getsecurity = selinux_key_getsecurity, |
Michael LeMay | d720024 | 2006-06-22 14:47:17 -0700 | [diff] [blame] | 5724 | #endif |
Ahmed S. Darwish | 9d57a7f | 2008-03-01 22:03:14 +0200 | [diff] [blame] | 5725 | |
| 5726 | #ifdef CONFIG_AUDIT |
| 5727 | .audit_rule_init = selinux_audit_rule_init, |
| 5728 | .audit_rule_known = selinux_audit_rule_known, |
| 5729 | .audit_rule_match = selinux_audit_rule_match, |
| 5730 | .audit_rule_free = selinux_audit_rule_free, |
| 5731 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5732 | }; |
| 5733 | |
| 5734 | static __init int selinux_init(void) |
| 5735 | { |
Ahmed S. Darwish | 076c54c | 2008-03-06 18:09:10 +0200 | [diff] [blame] | 5736 | if (!security_module_enable(&selinux_ops)) { |
| 5737 | selinux_enabled = 0; |
| 5738 | return 0; |
| 5739 | } |
| 5740 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5741 | if (!selinux_enabled) { |
| 5742 | printk(KERN_INFO "SELinux: Disabled at boot.\n"); |
| 5743 | return 0; |
| 5744 | } |
| 5745 | |
| 5746 | printk(KERN_INFO "SELinux: Initializing.\n"); |
| 5747 | |
| 5748 | /* Set the security state for the initial task. */ |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 5749 | cred_init_security(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5750 | |
Stephen Smalley | fcaaade | 2010-04-28 15:57:57 -0400 | [diff] [blame] | 5751 | default_noexec = !(VM_DATA_DEFAULT_FLAGS & VM_EXEC); |
| 5752 | |
James Morris | 7cae7e2 | 2006-03-22 00:09:22 -0800 | [diff] [blame] | 5753 | sel_inode_cache = kmem_cache_create("selinux_inode_security", |
| 5754 | sizeof(struct inode_security_struct), |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 5755 | 0, SLAB_PANIC, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5756 | avc_init(); |
| 5757 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5758 | if (register_security(&selinux_ops)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5759 | panic("SELinux: Unable to register with kernel.\n"); |
| 5760 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5761 | if (selinux_enforcing) |
Eric Paris | fadcdb4 | 2007-02-22 18:11:31 -0500 | [diff] [blame] | 5762 | printk(KERN_DEBUG "SELinux: Starting in enforcing mode\n"); |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5763 | else |
Eric Paris | fadcdb4 | 2007-02-22 18:11:31 -0500 | [diff] [blame] | 5764 | printk(KERN_DEBUG "SELinux: Starting in permissive mode\n"); |
Michael LeMay | d720024 | 2006-06-22 14:47:17 -0700 | [diff] [blame] | 5765 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5766 | return 0; |
| 5767 | } |
| 5768 | |
Al Viro | e8c2625 | 2010-03-23 06:36:54 -0400 | [diff] [blame] | 5769 | static void delayed_superblock_init(struct super_block *sb, void *unused) |
| 5770 | { |
| 5771 | superblock_doinit(sb, NULL); |
| 5772 | } |
| 5773 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5774 | void selinux_complete_init(void) |
| 5775 | { |
Eric Paris | fadcdb4 | 2007-02-22 18:11:31 -0500 | [diff] [blame] | 5776 | printk(KERN_DEBUG "SELinux: Completing initialization.\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5777 | |
| 5778 | /* Set up any superblocks initialized prior to the policy load. */ |
Eric Paris | fadcdb4 | 2007-02-22 18:11:31 -0500 | [diff] [blame] | 5779 | printk(KERN_DEBUG "SELinux: Setting up existing superblocks.\n"); |
Al Viro | e8c2625 | 2010-03-23 06:36:54 -0400 | [diff] [blame] | 5780 | iterate_supers(delayed_superblock_init, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5781 | } |
| 5782 | |
| 5783 | /* SELinux requires early initialization in order to label |
| 5784 | all processes and objects when they are created. */ |
| 5785 | security_initcall(selinux_init); |
| 5786 | |
Stephen Smalley | c2b507f | 2006-02-04 23:27:50 -0800 | [diff] [blame] | 5787 | #if defined(CONFIG_NETFILTER) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5788 | |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 5789 | static struct nf_hook_ops selinux_ipv4_ops[] = { |
| 5790 | { |
| 5791 | .hook = selinux_ipv4_postroute, |
| 5792 | .owner = THIS_MODULE, |
Alban Crequy | 2597a83 | 2012-05-14 03:56:39 +0000 | [diff] [blame] | 5793 | .pf = NFPROTO_IPV4, |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 5794 | .hooknum = NF_INET_POST_ROUTING, |
| 5795 | .priority = NF_IP_PRI_SELINUX_LAST, |
| 5796 | }, |
| 5797 | { |
| 5798 | .hook = selinux_ipv4_forward, |
| 5799 | .owner = THIS_MODULE, |
Alban Crequy | 2597a83 | 2012-05-14 03:56:39 +0000 | [diff] [blame] | 5800 | .pf = NFPROTO_IPV4, |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 5801 | .hooknum = NF_INET_FORWARD, |
| 5802 | .priority = NF_IP_PRI_SELINUX_FIRST, |
Paul Moore | 948bf85 | 2008-10-10 10:16:32 -0400 | [diff] [blame] | 5803 | }, |
| 5804 | { |
| 5805 | .hook = selinux_ipv4_output, |
| 5806 | .owner = THIS_MODULE, |
Alban Crequy | 2597a83 | 2012-05-14 03:56:39 +0000 | [diff] [blame] | 5807 | .pf = NFPROTO_IPV4, |
Paul Moore | 948bf85 | 2008-10-10 10:16:32 -0400 | [diff] [blame] | 5808 | .hooknum = NF_INET_LOCAL_OUT, |
| 5809 | .priority = NF_IP_PRI_SELINUX_FIRST, |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 5810 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5811 | }; |
| 5812 | |
| 5813 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
| 5814 | |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 5815 | static struct nf_hook_ops selinux_ipv6_ops[] = { |
| 5816 | { |
| 5817 | .hook = selinux_ipv6_postroute, |
| 5818 | .owner = THIS_MODULE, |
Alban Crequy | 2597a83 | 2012-05-14 03:56:39 +0000 | [diff] [blame] | 5819 | .pf = NFPROTO_IPV6, |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 5820 | .hooknum = NF_INET_POST_ROUTING, |
| 5821 | .priority = NF_IP6_PRI_SELINUX_LAST, |
| 5822 | }, |
| 5823 | { |
| 5824 | .hook = selinux_ipv6_forward, |
| 5825 | .owner = THIS_MODULE, |
Alban Crequy | 2597a83 | 2012-05-14 03:56:39 +0000 | [diff] [blame] | 5826 | .pf = NFPROTO_IPV6, |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 5827 | .hooknum = NF_INET_FORWARD, |
| 5828 | .priority = NF_IP6_PRI_SELINUX_FIRST, |
| 5829 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5830 | }; |
| 5831 | |
| 5832 | #endif /* IPV6 */ |
| 5833 | |
| 5834 | static int __init selinux_nf_ip_init(void) |
| 5835 | { |
| 5836 | int err = 0; |
| 5837 | |
| 5838 | if (!selinux_enabled) |
| 5839 | goto out; |
Eric Paris | fadcdb4 | 2007-02-22 18:11:31 -0500 | [diff] [blame] | 5840 | |
| 5841 | printk(KERN_DEBUG "SELinux: Registering netfilter hooks\n"); |
| 5842 | |
Alexey Dobriyan | 6c5a9d2 | 2008-07-26 17:48:15 -0700 | [diff] [blame] | 5843 | err = nf_register_hooks(selinux_ipv4_ops, ARRAY_SIZE(selinux_ipv4_ops)); |
| 5844 | if (err) |
| 5845 | panic("SELinux: nf_register_hooks for IPv4: error %d\n", err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5846 | |
| 5847 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
Alexey Dobriyan | 6c5a9d2 | 2008-07-26 17:48:15 -0700 | [diff] [blame] | 5848 | err = nf_register_hooks(selinux_ipv6_ops, ARRAY_SIZE(selinux_ipv6_ops)); |
| 5849 | if (err) |
| 5850 | panic("SELinux: nf_register_hooks for IPv6: error %d\n", err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5851 | #endif /* IPV6 */ |
Trent Jaeger | d28d1e0 | 2005-12-13 23:12:40 -0800 | [diff] [blame] | 5852 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5853 | out: |
| 5854 | return err; |
| 5855 | } |
| 5856 | |
| 5857 | __initcall(selinux_nf_ip_init); |
| 5858 | |
| 5859 | #ifdef CONFIG_SECURITY_SELINUX_DISABLE |
| 5860 | static void selinux_nf_ip_exit(void) |
| 5861 | { |
Eric Paris | fadcdb4 | 2007-02-22 18:11:31 -0500 | [diff] [blame] | 5862 | printk(KERN_DEBUG "SELinux: Unregistering netfilter hooks\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5863 | |
Alexey Dobriyan | 6c5a9d2 | 2008-07-26 17:48:15 -0700 | [diff] [blame] | 5864 | nf_unregister_hooks(selinux_ipv4_ops, ARRAY_SIZE(selinux_ipv4_ops)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5865 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
Alexey Dobriyan | 6c5a9d2 | 2008-07-26 17:48:15 -0700 | [diff] [blame] | 5866 | nf_unregister_hooks(selinux_ipv6_ops, ARRAY_SIZE(selinux_ipv6_ops)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5867 | #endif /* IPV6 */ |
| 5868 | } |
| 5869 | #endif |
| 5870 | |
Stephen Smalley | c2b507f | 2006-02-04 23:27:50 -0800 | [diff] [blame] | 5871 | #else /* CONFIG_NETFILTER */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5872 | |
| 5873 | #ifdef CONFIG_SECURITY_SELINUX_DISABLE |
| 5874 | #define selinux_nf_ip_exit() |
| 5875 | #endif |
| 5876 | |
Stephen Smalley | c2b507f | 2006-02-04 23:27:50 -0800 | [diff] [blame] | 5877 | #endif /* CONFIG_NETFILTER */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5878 | |
| 5879 | #ifdef CONFIG_SECURITY_SELINUX_DISABLE |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5880 | static int selinux_disabled; |
| 5881 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5882 | int selinux_disable(void) |
| 5883 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5884 | if (ss_initialized) { |
| 5885 | /* Not permitted after initial policy load. */ |
| 5886 | return -EINVAL; |
| 5887 | } |
| 5888 | |
| 5889 | if (selinux_disabled) { |
| 5890 | /* Only do this once. */ |
| 5891 | return -EINVAL; |
| 5892 | } |
| 5893 | |
| 5894 | printk(KERN_INFO "SELinux: Disabled at runtime.\n"); |
| 5895 | |
| 5896 | selinux_disabled = 1; |
Stephen Smalley | 30d5528 | 2006-05-03 10:52:36 -0400 | [diff] [blame] | 5897 | selinux_enabled = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5898 | |
wzt.wzt@gmail.com | 189b3b1 | 2010-02-23 23:15:28 +0800 | [diff] [blame] | 5899 | reset_security_ops(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5900 | |
Eric Paris | af8ff04 | 2009-09-20 21:23:01 -0400 | [diff] [blame] | 5901 | /* Try to destroy the avc node cache */ |
| 5902 | avc_disable(); |
| 5903 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5904 | /* Unregister netfilter hooks. */ |
| 5905 | selinux_nf_ip_exit(); |
| 5906 | |
| 5907 | /* Unregister selinuxfs. */ |
| 5908 | exit_sel_fs(); |
| 5909 | |
| 5910 | return 0; |
| 5911 | } |
| 5912 | #endif |