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. |
| 17 | * Paul Moore <paul.moore@hp.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> |
Eric Paris | 0b24dcb | 2011-02-25 15:39:20 -0500 | [diff] [blame] | 31 | #include <linux/ext2_fs.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | #include <linux/sched.h> |
| 33 | #include <linux/security.h> |
| 34 | #include <linux/xattr.h> |
| 35 | #include <linux/capability.h> |
| 36 | #include <linux/unistd.h> |
| 37 | #include <linux/mm.h> |
| 38 | #include <linux/mman.h> |
| 39 | #include <linux/slab.h> |
| 40 | #include <linux/pagemap.h> |
Eric Paris | 0b24dcb | 2011-02-25 15:39:20 -0500 | [diff] [blame] | 41 | #include <linux/proc_fs.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | #include <linux/swap.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | #include <linux/spinlock.h> |
| 44 | #include <linux/syscalls.h> |
Eric Paris | 2a7dba3 | 2011-02-01 11:05:39 -0500 | [diff] [blame] | 45 | #include <linux/dcache.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 46 | #include <linux/file.h> |
Al Viro | 9f3acc3 | 2008-04-24 07:44:08 -0400 | [diff] [blame] | 47 | #include <linux/fdtable.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | #include <linux/namei.h> |
| 49 | #include <linux/mount.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | #include <linux/netfilter_ipv4.h> |
| 51 | #include <linux/netfilter_ipv6.h> |
| 52 | #include <linux/tty.h> |
| 53 | #include <net/icmp.h> |
Stephen Hemminger | 227b60f | 2007-10-10 17:30:46 -0700 | [diff] [blame] | 54 | #include <net/ip.h> /* for local_port_range[] */ |
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> |
Paul Moore | d621d35 | 2008-01-29 08:43:36 -0500 | [diff] [blame] | 60 | #include <asm/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 */ |
| 64 | #include <linux/netlink.h> |
| 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> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 83 | |
| 84 | #include "avc.h" |
| 85 | #include "objsec.h" |
| 86 | #include "netif.h" |
Paul Moore | 224dfbd | 2008-01-29 08:38:13 -0500 | [diff] [blame] | 87 | #include "netnode.h" |
Paul Moore | 3e11217 | 2008-04-10 10:48:14 -0400 | [diff] [blame] | 88 | #include "netport.h" |
Trent Jaeger | d28d1e0 | 2005-12-13 23:12:40 -0800 | [diff] [blame] | 89 | #include "xfrm.h" |
Paul Moore | c60475b | 2007-02-28 15:14:23 -0500 | [diff] [blame] | 90 | #include "netlabel.h" |
Ahmed S. Darwish | 9d57a7f | 2008-03-01 22:03:14 +0200 | [diff] [blame] | 91 | #include "audit.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 92 | |
David P. Quigley | 11689d4 | 2009-01-16 09:22:03 -0500 | [diff] [blame] | 93 | #define NUM_SEL_MNT_OPTS 5 |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 94 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | extern int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm); |
James Morris | 20510f2 | 2007-10-16 23:31:32 -0700 | [diff] [blame] | 96 | extern struct security_operations *security_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 97 | |
Paul Moore | d621d35 | 2008-01-29 08:43:36 -0500 | [diff] [blame] | 98 | /* SECMARK reference count */ |
| 99 | atomic_t selinux_secmark_refcount = ATOMIC_INIT(0); |
| 100 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 101 | #ifdef CONFIG_SECURITY_SELINUX_DEVELOP |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 102 | int selinux_enforcing; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 103 | |
| 104 | static int __init enforcing_setup(char *str) |
| 105 | { |
Eric Paris | f526971 | 2008-05-14 11:27:45 -0400 | [diff] [blame] | 106 | unsigned long enforcing; |
| 107 | if (!strict_strtoul(str, 0, &enforcing)) |
| 108 | selinux_enforcing = enforcing ? 1 : 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 109 | return 1; |
| 110 | } |
| 111 | __setup("enforcing=", enforcing_setup); |
| 112 | #endif |
| 113 | |
| 114 | #ifdef CONFIG_SECURITY_SELINUX_BOOTPARAM |
| 115 | int selinux_enabled = CONFIG_SECURITY_SELINUX_BOOTPARAM_VALUE; |
| 116 | |
| 117 | static int __init selinux_enabled_setup(char *str) |
| 118 | { |
Eric Paris | f526971 | 2008-05-14 11:27:45 -0400 | [diff] [blame] | 119 | unsigned long enabled; |
| 120 | if (!strict_strtoul(str, 0, &enabled)) |
| 121 | selinux_enabled = enabled ? 1 : 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 122 | return 1; |
| 123 | } |
| 124 | __setup("selinux=", selinux_enabled_setup); |
Stephen Smalley | 30d5528 | 2006-05-03 10:52:36 -0400 | [diff] [blame] | 125 | #else |
| 126 | int selinux_enabled = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 127 | #endif |
| 128 | |
Christoph Lameter | e18b890 | 2006-12-06 20:33:20 -0800 | [diff] [blame] | 129 | static struct kmem_cache *sel_inode_cache; |
James Morris | 7cae7e2 | 2006-03-22 00:09:22 -0800 | [diff] [blame] | 130 | |
Paul Moore | d621d35 | 2008-01-29 08:43:36 -0500 | [diff] [blame] | 131 | /** |
| 132 | * selinux_secmark_enabled - Check to see if SECMARK is currently enabled |
| 133 | * |
| 134 | * Description: |
| 135 | * This function checks the SECMARK reference counter to see if any SECMARK |
| 136 | * targets are currently configured, if the reference counter is greater than |
| 137 | * zero SECMARK is considered to be enabled. Returns true (1) if SECMARK is |
| 138 | * enabled, false (0) if SECMARK is disabled. |
| 139 | * |
| 140 | */ |
| 141 | static int selinux_secmark_enabled(void) |
| 142 | { |
| 143 | return (atomic_read(&selinux_secmark_refcount) > 0); |
| 144 | } |
| 145 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 146 | /* |
| 147 | * initialise the security for the init task |
| 148 | */ |
| 149 | static void cred_init_security(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 150 | { |
David Howells | 3b11a1d | 2008-11-14 10:39:26 +1100 | [diff] [blame] | 151 | struct cred *cred = (struct cred *) current->real_cred; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 152 | struct task_security_struct *tsec; |
| 153 | |
James Morris | 89d155e | 2005-10-30 14:59:21 -0800 | [diff] [blame] | 154 | tsec = kzalloc(sizeof(struct task_security_struct), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 155 | if (!tsec) |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 156 | panic("SELinux: Failed to initialize initial task.\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 157 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 158 | tsec->osid = tsec->sid = SECINITSID_KERNEL; |
David Howells | f1752ee | 2008-11-14 10:39:17 +1100 | [diff] [blame] | 159 | cred->security = tsec; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 160 | } |
| 161 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 162 | /* |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 163 | * get the security ID of a set of credentials |
| 164 | */ |
| 165 | static inline u32 cred_sid(const struct cred *cred) |
| 166 | { |
| 167 | const struct task_security_struct *tsec; |
| 168 | |
| 169 | tsec = cred->security; |
| 170 | return tsec->sid; |
| 171 | } |
| 172 | |
| 173 | /* |
David Howells | 3b11a1d | 2008-11-14 10:39:26 +1100 | [diff] [blame] | 174 | * get the objective security ID of a task |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 175 | */ |
| 176 | static inline u32 task_sid(const struct task_struct *task) |
| 177 | { |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 178 | u32 sid; |
| 179 | |
| 180 | rcu_read_lock(); |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 181 | sid = cred_sid(__task_cred(task)); |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 182 | rcu_read_unlock(); |
| 183 | return sid; |
| 184 | } |
| 185 | |
| 186 | /* |
David Howells | 3b11a1d | 2008-11-14 10:39:26 +1100 | [diff] [blame] | 187 | * get the subjective security ID of the current task |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 188 | */ |
| 189 | static inline u32 current_sid(void) |
| 190 | { |
Paul Moore | 5fb4987 | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 191 | const struct task_security_struct *tsec = current_security(); |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 192 | |
| 193 | return tsec->sid; |
| 194 | } |
| 195 | |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 196 | /* Allocate and free functions for each kind of security blob. */ |
| 197 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 198 | static int inode_alloc_security(struct inode *inode) |
| 199 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 200 | struct inode_security_struct *isec; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 201 | u32 sid = current_sid(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 202 | |
Josef Bacik | a02fe13 | 2008-04-04 09:35:05 +1100 | [diff] [blame] | 203 | isec = kmem_cache_zalloc(sel_inode_cache, GFP_NOFS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 204 | if (!isec) |
| 205 | return -ENOMEM; |
| 206 | |
Eric Paris | 2397074 | 2006-09-25 23:32:01 -0700 | [diff] [blame] | 207 | mutex_init(&isec->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 208 | INIT_LIST_HEAD(&isec->list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 209 | isec->inode = inode; |
| 210 | isec->sid = SECINITSID_UNLABELED; |
| 211 | isec->sclass = SECCLASS_FILE; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 212 | isec->task_sid = sid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 213 | inode->i_security = isec; |
| 214 | |
| 215 | return 0; |
| 216 | } |
| 217 | |
| 218 | static void inode_free_security(struct inode *inode) |
| 219 | { |
| 220 | struct inode_security_struct *isec = inode->i_security; |
| 221 | struct superblock_security_struct *sbsec = inode->i_sb->s_security; |
| 222 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 223 | spin_lock(&sbsec->isec_lock); |
| 224 | if (!list_empty(&isec->list)) |
| 225 | list_del_init(&isec->list); |
| 226 | spin_unlock(&sbsec->isec_lock); |
| 227 | |
| 228 | inode->i_security = NULL; |
James Morris | 7cae7e2 | 2006-03-22 00:09:22 -0800 | [diff] [blame] | 229 | kmem_cache_free(sel_inode_cache, isec); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 230 | } |
| 231 | |
| 232 | static int file_alloc_security(struct file *file) |
| 233 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 234 | struct file_security_struct *fsec; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 235 | u32 sid = current_sid(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 236 | |
Stephen Smalley | 26d2a4b | 2006-02-01 03:05:55 -0800 | [diff] [blame] | 237 | fsec = kzalloc(sizeof(struct file_security_struct), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 238 | if (!fsec) |
| 239 | return -ENOMEM; |
| 240 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 241 | fsec->sid = sid; |
| 242 | fsec->fown_sid = sid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 243 | file->f_security = fsec; |
| 244 | |
| 245 | return 0; |
| 246 | } |
| 247 | |
| 248 | static void file_free_security(struct file *file) |
| 249 | { |
| 250 | struct file_security_struct *fsec = file->f_security; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 251 | file->f_security = NULL; |
| 252 | kfree(fsec); |
| 253 | } |
| 254 | |
| 255 | static int superblock_alloc_security(struct super_block *sb) |
| 256 | { |
| 257 | struct superblock_security_struct *sbsec; |
| 258 | |
James Morris | 89d155e | 2005-10-30 14:59:21 -0800 | [diff] [blame] | 259 | sbsec = kzalloc(sizeof(struct superblock_security_struct), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 260 | if (!sbsec) |
| 261 | return -ENOMEM; |
| 262 | |
Eric Paris | bc7e982 | 2006-09-25 23:32:02 -0700 | [diff] [blame] | 263 | mutex_init(&sbsec->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 264 | INIT_LIST_HEAD(&sbsec->isec_head); |
| 265 | spin_lock_init(&sbsec->isec_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 266 | sbsec->sb = sb; |
| 267 | sbsec->sid = SECINITSID_UNLABELED; |
| 268 | sbsec->def_sid = SECINITSID_FILE; |
Eric Paris | c312feb | 2006-07-10 04:43:53 -0700 | [diff] [blame] | 269 | sbsec->mntpoint_sid = SECINITSID_UNLABELED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 270 | sb->s_security = sbsec; |
| 271 | |
| 272 | return 0; |
| 273 | } |
| 274 | |
| 275 | static void superblock_free_security(struct super_block *sb) |
| 276 | { |
| 277 | struct superblock_security_struct *sbsec = sb->s_security; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 278 | sb->s_security = NULL; |
| 279 | kfree(sbsec); |
| 280 | } |
| 281 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 282 | /* The security server must be initialized before |
| 283 | any labeling or access decisions can be provided. */ |
| 284 | extern int ss_initialized; |
| 285 | |
| 286 | /* The file system's label must be initialized prior to use. */ |
| 287 | |
Stephen Hemminger | 634a539 | 2010-03-04 21:59:03 -0800 | [diff] [blame] | 288 | static const char *labeling_behaviors[6] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 289 | "uses xattr", |
| 290 | "uses transition SIDs", |
| 291 | "uses task SIDs", |
| 292 | "uses genfs_contexts", |
| 293 | "not configured for labeling", |
| 294 | "uses mountpoint labeling", |
| 295 | }; |
| 296 | |
| 297 | static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dentry); |
| 298 | |
| 299 | static inline int inode_doinit(struct inode *inode) |
| 300 | { |
| 301 | return inode_doinit_with_dentry(inode, NULL); |
| 302 | } |
| 303 | |
| 304 | enum { |
Eric Paris | 31e8793 | 2007-09-19 17:19:12 -0400 | [diff] [blame] | 305 | Opt_error = -1, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 306 | Opt_context = 1, |
| 307 | Opt_fscontext = 2, |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 308 | Opt_defcontext = 3, |
| 309 | Opt_rootcontext = 4, |
David P. Quigley | 11689d4 | 2009-01-16 09:22:03 -0500 | [diff] [blame] | 310 | Opt_labelsupport = 5, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 311 | }; |
| 312 | |
Steven Whitehouse | a447c09 | 2008-10-13 10:46:57 +0100 | [diff] [blame] | 313 | static const match_table_t tokens = { |
Eric Paris | 832cbd9 | 2008-04-01 13:24:09 -0400 | [diff] [blame] | 314 | {Opt_context, CONTEXT_STR "%s"}, |
| 315 | {Opt_fscontext, FSCONTEXT_STR "%s"}, |
| 316 | {Opt_defcontext, DEFCONTEXT_STR "%s"}, |
| 317 | {Opt_rootcontext, ROOTCONTEXT_STR "%s"}, |
David P. Quigley | 11689d4 | 2009-01-16 09:22:03 -0500 | [diff] [blame] | 318 | {Opt_labelsupport, LABELSUPP_STR}, |
Eric Paris | 31e8793 | 2007-09-19 17:19:12 -0400 | [diff] [blame] | 319 | {Opt_error, NULL}, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 320 | }; |
| 321 | |
| 322 | #define SEL_MOUNT_FAIL_MSG "SELinux: duplicate or incompatible mount options\n" |
| 323 | |
Eric Paris | c312feb | 2006-07-10 04:43:53 -0700 | [diff] [blame] | 324 | static int may_context_mount_sb_relabel(u32 sid, |
| 325 | struct superblock_security_struct *sbsec, |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 326 | const struct cred *cred) |
Eric Paris | c312feb | 2006-07-10 04:43:53 -0700 | [diff] [blame] | 327 | { |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 328 | const struct task_security_struct *tsec = cred->security; |
Eric Paris | c312feb | 2006-07-10 04:43:53 -0700 | [diff] [blame] | 329 | int rc; |
| 330 | |
| 331 | rc = avc_has_perm(tsec->sid, sbsec->sid, SECCLASS_FILESYSTEM, |
| 332 | FILESYSTEM__RELABELFROM, NULL); |
| 333 | if (rc) |
| 334 | return rc; |
| 335 | |
| 336 | rc = avc_has_perm(tsec->sid, sid, SECCLASS_FILESYSTEM, |
| 337 | FILESYSTEM__RELABELTO, NULL); |
| 338 | return rc; |
| 339 | } |
| 340 | |
Eric Paris | 0808925 | 2006-07-10 04:43:55 -0700 | [diff] [blame] | 341 | static int may_context_mount_inode_relabel(u32 sid, |
| 342 | struct superblock_security_struct *sbsec, |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 343 | const struct cred *cred) |
Eric Paris | 0808925 | 2006-07-10 04:43:55 -0700 | [diff] [blame] | 344 | { |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 345 | const struct task_security_struct *tsec = cred->security; |
Eric Paris | 0808925 | 2006-07-10 04:43:55 -0700 | [diff] [blame] | 346 | int rc; |
| 347 | rc = avc_has_perm(tsec->sid, sbsec->sid, SECCLASS_FILESYSTEM, |
| 348 | FILESYSTEM__RELABELFROM, NULL); |
| 349 | if (rc) |
| 350 | return rc; |
| 351 | |
| 352 | rc = avc_has_perm(sid, sbsec->sid, SECCLASS_FILESYSTEM, |
| 353 | FILESYSTEM__ASSOCIATE, NULL); |
| 354 | return rc; |
| 355 | } |
| 356 | |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 357 | static int sb_finish_set_opts(struct super_block *sb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 358 | { |
| 359 | struct superblock_security_struct *sbsec = sb->s_security; |
| 360 | struct dentry *root = sb->s_root; |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 361 | struct inode *root_inode = root->d_inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 362 | int rc = 0; |
| 363 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 364 | if (sbsec->behavior == SECURITY_FS_USE_XATTR) { |
| 365 | /* Make sure that the xattr handler exists and that no |
| 366 | error other than -ENODATA is returned by getxattr on |
| 367 | the root directory. -ENODATA is ok, as this may be |
| 368 | the first boot of the SELinux kernel before we have |
| 369 | assigned xattr values to the filesystem. */ |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 370 | if (!root_inode->i_op->getxattr) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 371 | printk(KERN_WARNING "SELinux: (dev %s, type %s) has no " |
| 372 | "xattr support\n", sb->s_id, sb->s_type->name); |
| 373 | rc = -EOPNOTSUPP; |
| 374 | goto out; |
| 375 | } |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 376 | rc = root_inode->i_op->getxattr(root, XATTR_NAME_SELINUX, NULL, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 377 | if (rc < 0 && rc != -ENODATA) { |
| 378 | if (rc == -EOPNOTSUPP) |
| 379 | printk(KERN_WARNING "SELinux: (dev %s, type " |
| 380 | "%s) has no security xattr handler\n", |
| 381 | sb->s_id, sb->s_type->name); |
| 382 | else |
| 383 | printk(KERN_WARNING "SELinux: (dev %s, type " |
| 384 | "%s) getxattr errno %d\n", sb->s_id, |
| 385 | sb->s_type->name, -rc); |
| 386 | goto out; |
| 387 | } |
| 388 | } |
| 389 | |
David P. Quigley | 11689d4 | 2009-01-16 09:22:03 -0500 | [diff] [blame] | 390 | sbsec->flags |= (SE_SBINITIALIZED | SE_SBLABELSUPP); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 391 | |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 392 | if (sbsec->behavior > ARRAY_SIZE(labeling_behaviors)) |
Eric Paris | fadcdb4 | 2007-02-22 18:11:31 -0500 | [diff] [blame] | 393 | printk(KERN_ERR "SELinux: initialized (dev %s, type %s), unknown behavior\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 394 | sb->s_id, sb->s_type->name); |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 395 | else |
Eric Paris | fadcdb4 | 2007-02-22 18:11:31 -0500 | [diff] [blame] | 396 | printk(KERN_DEBUG "SELinux: initialized (dev %s, type %s), %s\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 397 | sb->s_id, sb->s_type->name, |
| 398 | labeling_behaviors[sbsec->behavior-1]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 399 | |
David P. Quigley | 11689d4 | 2009-01-16 09:22:03 -0500 | [diff] [blame] | 400 | if (sbsec->behavior == SECURITY_FS_USE_GENFS || |
| 401 | sbsec->behavior == SECURITY_FS_USE_MNTPOINT || |
| 402 | sbsec->behavior == SECURITY_FS_USE_NONE || |
| 403 | sbsec->behavior > ARRAY_SIZE(labeling_behaviors)) |
| 404 | sbsec->flags &= ~SE_SBLABELSUPP; |
| 405 | |
David P. Quigley | ddd29ec | 2009-09-09 14:25:37 -0400 | [diff] [blame] | 406 | /* Special handling for sysfs. Is genfs but also has setxattr handler*/ |
| 407 | if (strncmp(sb->s_type->name, "sysfs", sizeof("sysfs")) == 0) |
| 408 | sbsec->flags |= SE_SBLABELSUPP; |
| 409 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 410 | /* Initialize the root inode. */ |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 411 | rc = inode_doinit_with_dentry(root_inode, root); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 412 | |
| 413 | /* Initialize any other inodes associated with the superblock, e.g. |
| 414 | inodes created prior to initial policy load or inodes created |
| 415 | during get_sb by a pseudo filesystem that directly |
| 416 | populates itself. */ |
| 417 | spin_lock(&sbsec->isec_lock); |
| 418 | next_inode: |
| 419 | if (!list_empty(&sbsec->isec_head)) { |
| 420 | struct inode_security_struct *isec = |
| 421 | list_entry(sbsec->isec_head.next, |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 422 | struct inode_security_struct, list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 423 | struct inode *inode = isec->inode; |
| 424 | spin_unlock(&sbsec->isec_lock); |
| 425 | inode = igrab(inode); |
| 426 | if (inode) { |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 427 | if (!IS_PRIVATE(inode)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 428 | inode_doinit(inode); |
| 429 | iput(inode); |
| 430 | } |
| 431 | spin_lock(&sbsec->isec_lock); |
| 432 | list_del_init(&isec->list); |
| 433 | goto next_inode; |
| 434 | } |
| 435 | spin_unlock(&sbsec->isec_lock); |
| 436 | out: |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 437 | return rc; |
| 438 | } |
| 439 | |
| 440 | /* |
| 441 | * This function should allow an FS to ask what it's mount security |
| 442 | * options were so it can use those later for submounts, displaying |
| 443 | * mount options, or whatever. |
| 444 | */ |
| 445 | static int selinux_get_mnt_opts(const struct super_block *sb, |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 446 | struct security_mnt_opts *opts) |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 447 | { |
| 448 | int rc = 0, i; |
| 449 | struct superblock_security_struct *sbsec = sb->s_security; |
| 450 | char *context = NULL; |
| 451 | u32 len; |
| 452 | char tmp; |
| 453 | |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 454 | security_init_mnt_opts(opts); |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 455 | |
David P. Quigley | 0d90a7e | 2009-01-16 09:22:02 -0500 | [diff] [blame] | 456 | if (!(sbsec->flags & SE_SBINITIALIZED)) |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 457 | return -EINVAL; |
| 458 | |
| 459 | if (!ss_initialized) |
| 460 | return -EINVAL; |
| 461 | |
David P. Quigley | 0d90a7e | 2009-01-16 09:22:02 -0500 | [diff] [blame] | 462 | tmp = sbsec->flags & SE_MNTMASK; |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 463 | /* count the number of mount options for this sb */ |
| 464 | for (i = 0; i < 8; i++) { |
| 465 | if (tmp & 0x01) |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 466 | opts->num_mnt_opts++; |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 467 | tmp >>= 1; |
| 468 | } |
David P. Quigley | 11689d4 | 2009-01-16 09:22:03 -0500 | [diff] [blame] | 469 | /* Check if the Label support flag is set */ |
| 470 | if (sbsec->flags & SE_SBLABELSUPP) |
| 471 | opts->num_mnt_opts++; |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 472 | |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 473 | opts->mnt_opts = kcalloc(opts->num_mnt_opts, sizeof(char *), GFP_ATOMIC); |
| 474 | if (!opts->mnt_opts) { |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 475 | rc = -ENOMEM; |
| 476 | goto out_free; |
| 477 | } |
| 478 | |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 479 | opts->mnt_opts_flags = kcalloc(opts->num_mnt_opts, sizeof(int), GFP_ATOMIC); |
| 480 | if (!opts->mnt_opts_flags) { |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 481 | rc = -ENOMEM; |
| 482 | goto out_free; |
| 483 | } |
| 484 | |
| 485 | i = 0; |
| 486 | if (sbsec->flags & FSCONTEXT_MNT) { |
| 487 | rc = security_sid_to_context(sbsec->sid, &context, &len); |
| 488 | if (rc) |
| 489 | goto out_free; |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 490 | opts->mnt_opts[i] = context; |
| 491 | opts->mnt_opts_flags[i++] = FSCONTEXT_MNT; |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 492 | } |
| 493 | if (sbsec->flags & CONTEXT_MNT) { |
| 494 | rc = security_sid_to_context(sbsec->mntpoint_sid, &context, &len); |
| 495 | if (rc) |
| 496 | goto out_free; |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 497 | opts->mnt_opts[i] = context; |
| 498 | opts->mnt_opts_flags[i++] = CONTEXT_MNT; |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 499 | } |
| 500 | if (sbsec->flags & DEFCONTEXT_MNT) { |
| 501 | rc = security_sid_to_context(sbsec->def_sid, &context, &len); |
| 502 | if (rc) |
| 503 | goto out_free; |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 504 | opts->mnt_opts[i] = context; |
| 505 | opts->mnt_opts_flags[i++] = DEFCONTEXT_MNT; |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 506 | } |
| 507 | if (sbsec->flags & ROOTCONTEXT_MNT) { |
| 508 | struct inode *root = sbsec->sb->s_root->d_inode; |
| 509 | struct inode_security_struct *isec = root->i_security; |
| 510 | |
| 511 | rc = security_sid_to_context(isec->sid, &context, &len); |
| 512 | if (rc) |
| 513 | goto out_free; |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 514 | opts->mnt_opts[i] = context; |
| 515 | opts->mnt_opts_flags[i++] = ROOTCONTEXT_MNT; |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 516 | } |
David P. Quigley | 11689d4 | 2009-01-16 09:22:03 -0500 | [diff] [blame] | 517 | if (sbsec->flags & SE_SBLABELSUPP) { |
| 518 | opts->mnt_opts[i] = NULL; |
| 519 | opts->mnt_opts_flags[i++] = SE_SBLABELSUPP; |
| 520 | } |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 521 | |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 522 | BUG_ON(i != opts->num_mnt_opts); |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 523 | |
| 524 | return 0; |
| 525 | |
| 526 | out_free: |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 527 | security_free_mnt_opts(opts); |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 528 | return rc; |
| 529 | } |
| 530 | |
| 531 | static int bad_option(struct superblock_security_struct *sbsec, char flag, |
| 532 | u32 old_sid, u32 new_sid) |
| 533 | { |
David P. Quigley | 0d90a7e | 2009-01-16 09:22:02 -0500 | [diff] [blame] | 534 | char mnt_flags = sbsec->flags & SE_MNTMASK; |
| 535 | |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 536 | /* check if the old mount command had the same options */ |
David P. Quigley | 0d90a7e | 2009-01-16 09:22:02 -0500 | [diff] [blame] | 537 | if (sbsec->flags & SE_SBINITIALIZED) |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 538 | if (!(sbsec->flags & flag) || |
| 539 | (old_sid != new_sid)) |
| 540 | return 1; |
| 541 | |
| 542 | /* check if we were passed the same options twice, |
| 543 | * aka someone passed context=a,context=b |
| 544 | */ |
David P. Quigley | 0d90a7e | 2009-01-16 09:22:02 -0500 | [diff] [blame] | 545 | if (!(sbsec->flags & SE_SBINITIALIZED)) |
| 546 | if (mnt_flags & flag) |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 547 | return 1; |
| 548 | return 0; |
| 549 | } |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 550 | |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 551 | /* |
| 552 | * Allow filesystems with binary mount data to explicitly set mount point |
| 553 | * labeling information. |
| 554 | */ |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 555 | static int selinux_set_mnt_opts(struct super_block *sb, |
| 556 | struct security_mnt_opts *opts) |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 557 | { |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 558 | const struct cred *cred = current_cred(); |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 559 | int rc = 0, i; |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 560 | struct superblock_security_struct *sbsec = sb->s_security; |
| 561 | const char *name = sb->s_type->name; |
James Morris | 089be43 | 2008-07-15 18:32:49 +1000 | [diff] [blame] | 562 | struct inode *inode = sbsec->sb->s_root->d_inode; |
| 563 | struct inode_security_struct *root_isec = inode->i_security; |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 564 | u32 fscontext_sid = 0, context_sid = 0, rootcontext_sid = 0; |
| 565 | u32 defcontext_sid = 0; |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 566 | char **mount_options = opts->mnt_opts; |
| 567 | int *flags = opts->mnt_opts_flags; |
| 568 | int num_opts = opts->num_mnt_opts; |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 569 | |
| 570 | mutex_lock(&sbsec->lock); |
| 571 | |
| 572 | if (!ss_initialized) { |
| 573 | if (!num_opts) { |
| 574 | /* Defer initialization until selinux_complete_init, |
| 575 | after the initial policy is loaded and the security |
| 576 | server is ready to handle calls. */ |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 577 | goto out; |
| 578 | } |
| 579 | rc = -EINVAL; |
Eric Paris | 744ba35 | 2008-04-17 11:52:44 -0400 | [diff] [blame] | 580 | printk(KERN_WARNING "SELinux: Unable to set superblock options " |
| 581 | "before the security server is initialized\n"); |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 582 | goto out; |
| 583 | } |
| 584 | |
| 585 | /* |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 586 | * Binary mount data FS will come through this function twice. Once |
| 587 | * from an explicit call and once from the generic calls from the vfs. |
| 588 | * Since the generic VFS calls will not contain any security mount data |
| 589 | * we need to skip the double mount verification. |
| 590 | * |
| 591 | * This does open a hole in which we will not notice if the first |
| 592 | * mount using this sb set explict options and a second mount using |
| 593 | * this sb does not set any security options. (The first options |
| 594 | * will be used for both mounts) |
| 595 | */ |
David P. Quigley | 0d90a7e | 2009-01-16 09:22:02 -0500 | [diff] [blame] | 596 | 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] | 597 | && (num_opts == 0)) |
Eric Paris | f526971 | 2008-05-14 11:27:45 -0400 | [diff] [blame] | 598 | goto out; |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 599 | |
| 600 | /* |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 601 | * parse the mount options, check if they are valid sids. |
| 602 | * also check if someone is trying to mount the same sb more |
| 603 | * than once with different security options. |
| 604 | */ |
| 605 | for (i = 0; i < num_opts; i++) { |
| 606 | u32 sid; |
David P. Quigley | 11689d4 | 2009-01-16 09:22:03 -0500 | [diff] [blame] | 607 | |
| 608 | if (flags[i] == SE_SBLABELSUPP) |
| 609 | continue; |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 610 | rc = security_context_to_sid(mount_options[i], |
| 611 | strlen(mount_options[i]), &sid); |
| 612 | if (rc) { |
| 613 | printk(KERN_WARNING "SELinux: security_context_to_sid" |
| 614 | "(%s) failed for (dev %s, type %s) errno=%d\n", |
| 615 | mount_options[i], sb->s_id, name, rc); |
| 616 | goto out; |
| 617 | } |
| 618 | switch (flags[i]) { |
| 619 | case FSCONTEXT_MNT: |
| 620 | fscontext_sid = sid; |
| 621 | |
| 622 | if (bad_option(sbsec, FSCONTEXT_MNT, sbsec->sid, |
| 623 | fscontext_sid)) |
| 624 | goto out_double_mount; |
| 625 | |
| 626 | sbsec->flags |= FSCONTEXT_MNT; |
| 627 | break; |
| 628 | case CONTEXT_MNT: |
| 629 | context_sid = sid; |
| 630 | |
| 631 | if (bad_option(sbsec, CONTEXT_MNT, sbsec->mntpoint_sid, |
| 632 | context_sid)) |
| 633 | goto out_double_mount; |
| 634 | |
| 635 | sbsec->flags |= CONTEXT_MNT; |
| 636 | break; |
| 637 | case ROOTCONTEXT_MNT: |
| 638 | rootcontext_sid = sid; |
| 639 | |
| 640 | if (bad_option(sbsec, ROOTCONTEXT_MNT, root_isec->sid, |
| 641 | rootcontext_sid)) |
| 642 | goto out_double_mount; |
| 643 | |
| 644 | sbsec->flags |= ROOTCONTEXT_MNT; |
| 645 | |
| 646 | break; |
| 647 | case DEFCONTEXT_MNT: |
| 648 | defcontext_sid = sid; |
| 649 | |
| 650 | if (bad_option(sbsec, DEFCONTEXT_MNT, sbsec->def_sid, |
| 651 | defcontext_sid)) |
| 652 | goto out_double_mount; |
| 653 | |
| 654 | sbsec->flags |= DEFCONTEXT_MNT; |
| 655 | |
| 656 | break; |
| 657 | default: |
| 658 | rc = -EINVAL; |
| 659 | goto out; |
| 660 | } |
| 661 | } |
| 662 | |
David P. Quigley | 0d90a7e | 2009-01-16 09:22:02 -0500 | [diff] [blame] | 663 | if (sbsec->flags & SE_SBINITIALIZED) { |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 664 | /* previously mounted with options, but not on this attempt? */ |
David P. Quigley | 0d90a7e | 2009-01-16 09:22:02 -0500 | [diff] [blame] | 665 | if ((sbsec->flags & SE_MNTMASK) && !num_opts) |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 666 | goto out_double_mount; |
| 667 | rc = 0; |
| 668 | goto out; |
| 669 | } |
| 670 | |
James Morris | 089be43 | 2008-07-15 18:32:49 +1000 | [diff] [blame] | 671 | if (strcmp(sb->s_type->name, "proc") == 0) |
David P. Quigley | 0d90a7e | 2009-01-16 09:22:02 -0500 | [diff] [blame] | 672 | sbsec->flags |= SE_SBPROC; |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 673 | |
| 674 | /* Determine the labeling behavior to use for this filesystem type. */ |
David P. Quigley | 0d90a7e | 2009-01-16 09:22:02 -0500 | [diff] [blame] | 675 | 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] | 676 | if (rc) { |
| 677 | printk(KERN_WARNING "%s: security_fs_use(%s) returned %d\n", |
James Morris | 089be43 | 2008-07-15 18:32:49 +1000 | [diff] [blame] | 678 | __func__, sb->s_type->name, rc); |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 679 | goto out; |
| 680 | } |
| 681 | |
| 682 | /* sets the context of the superblock for the fs being mounted. */ |
| 683 | if (fscontext_sid) { |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 684 | rc = may_context_mount_sb_relabel(fscontext_sid, sbsec, cred); |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 685 | if (rc) |
| 686 | goto out; |
| 687 | |
| 688 | sbsec->sid = fscontext_sid; |
| 689 | } |
| 690 | |
| 691 | /* |
| 692 | * Switch to using mount point labeling behavior. |
| 693 | * sets the label used on all file below the mountpoint, and will set |
| 694 | * the superblock context if not already set. |
| 695 | */ |
| 696 | if (context_sid) { |
| 697 | if (!fscontext_sid) { |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 698 | rc = may_context_mount_sb_relabel(context_sid, sbsec, |
| 699 | cred); |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 700 | if (rc) |
| 701 | goto out; |
| 702 | sbsec->sid = context_sid; |
| 703 | } else { |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 704 | rc = may_context_mount_inode_relabel(context_sid, sbsec, |
| 705 | cred); |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 706 | if (rc) |
| 707 | goto out; |
| 708 | } |
| 709 | if (!rootcontext_sid) |
| 710 | rootcontext_sid = context_sid; |
| 711 | |
| 712 | sbsec->mntpoint_sid = context_sid; |
| 713 | sbsec->behavior = SECURITY_FS_USE_MNTPOINT; |
| 714 | } |
| 715 | |
| 716 | if (rootcontext_sid) { |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 717 | rc = may_context_mount_inode_relabel(rootcontext_sid, sbsec, |
| 718 | cred); |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 719 | if (rc) |
| 720 | goto out; |
| 721 | |
| 722 | root_isec->sid = rootcontext_sid; |
| 723 | root_isec->initialized = 1; |
| 724 | } |
| 725 | |
| 726 | if (defcontext_sid) { |
| 727 | if (sbsec->behavior != SECURITY_FS_USE_XATTR) { |
| 728 | rc = -EINVAL; |
| 729 | printk(KERN_WARNING "SELinux: defcontext option is " |
| 730 | "invalid for this filesystem type\n"); |
| 731 | goto out; |
| 732 | } |
| 733 | |
| 734 | if (defcontext_sid != sbsec->def_sid) { |
| 735 | rc = may_context_mount_inode_relabel(defcontext_sid, |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 736 | sbsec, cred); |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 737 | if (rc) |
| 738 | goto out; |
| 739 | } |
| 740 | |
| 741 | sbsec->def_sid = defcontext_sid; |
| 742 | } |
| 743 | |
| 744 | rc = sb_finish_set_opts(sb); |
| 745 | out: |
Eric Paris | bc7e982 | 2006-09-25 23:32:02 -0700 | [diff] [blame] | 746 | mutex_unlock(&sbsec->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 747 | return rc; |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 748 | out_double_mount: |
| 749 | rc = -EINVAL; |
| 750 | printk(KERN_WARNING "SELinux: mount invalid. Same superblock, different " |
| 751 | "security settings for (dev %s, type %s)\n", sb->s_id, name); |
| 752 | goto out; |
| 753 | } |
| 754 | |
| 755 | static void selinux_sb_clone_mnt_opts(const struct super_block *oldsb, |
| 756 | struct super_block *newsb) |
| 757 | { |
| 758 | const struct superblock_security_struct *oldsbsec = oldsb->s_security; |
| 759 | struct superblock_security_struct *newsbsec = newsb->s_security; |
| 760 | |
| 761 | int set_fscontext = (oldsbsec->flags & FSCONTEXT_MNT); |
| 762 | int set_context = (oldsbsec->flags & CONTEXT_MNT); |
| 763 | int set_rootcontext = (oldsbsec->flags & ROOTCONTEXT_MNT); |
| 764 | |
Eric Paris | 0f5e642 | 2008-04-21 16:24:11 -0400 | [diff] [blame] | 765 | /* |
| 766 | * 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] | 767 | * mount options. thus we can safely deal with this superblock later |
Eric Paris | 0f5e642 | 2008-04-21 16:24:11 -0400 | [diff] [blame] | 768 | */ |
Al Viro | e8c2625 | 2010-03-23 06:36:54 -0400 | [diff] [blame] | 769 | if (!ss_initialized) |
Eric Paris | 0f5e642 | 2008-04-21 16:24:11 -0400 | [diff] [blame] | 770 | return; |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 771 | |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 772 | /* 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] | 773 | BUG_ON(!(oldsbsec->flags & SE_SBINITIALIZED)); |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 774 | |
Eric Paris | 5a55261 | 2008-04-09 14:08:35 -0400 | [diff] [blame] | 775 | /* if fs is reusing a sb, just let its options stand... */ |
David P. Quigley | 0d90a7e | 2009-01-16 09:22:02 -0500 | [diff] [blame] | 776 | if (newsbsec->flags & SE_SBINITIALIZED) |
Eric Paris | 5a55261 | 2008-04-09 14:08:35 -0400 | [diff] [blame] | 777 | return; |
| 778 | |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 779 | mutex_lock(&newsbsec->lock); |
| 780 | |
| 781 | newsbsec->flags = oldsbsec->flags; |
| 782 | |
| 783 | newsbsec->sid = oldsbsec->sid; |
| 784 | newsbsec->def_sid = oldsbsec->def_sid; |
| 785 | newsbsec->behavior = oldsbsec->behavior; |
| 786 | |
| 787 | if (set_context) { |
| 788 | u32 sid = oldsbsec->mntpoint_sid; |
| 789 | |
| 790 | if (!set_fscontext) |
| 791 | newsbsec->sid = sid; |
| 792 | if (!set_rootcontext) { |
| 793 | struct inode *newinode = newsb->s_root->d_inode; |
| 794 | struct inode_security_struct *newisec = newinode->i_security; |
| 795 | newisec->sid = sid; |
| 796 | } |
| 797 | newsbsec->mntpoint_sid = sid; |
| 798 | } |
| 799 | if (set_rootcontext) { |
| 800 | const struct inode *oldinode = oldsb->s_root->d_inode; |
| 801 | const struct inode_security_struct *oldisec = oldinode->i_security; |
| 802 | struct inode *newinode = newsb->s_root->d_inode; |
| 803 | struct inode_security_struct *newisec = newinode->i_security; |
| 804 | |
| 805 | newisec->sid = oldisec->sid; |
| 806 | } |
| 807 | |
| 808 | sb_finish_set_opts(newsb); |
| 809 | mutex_unlock(&newsbsec->lock); |
| 810 | } |
| 811 | |
Adrian Bunk | 2e1479d | 2008-03-17 22:29:23 +0200 | [diff] [blame] | 812 | static int selinux_parse_opts_str(char *options, |
| 813 | struct security_mnt_opts *opts) |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 814 | { |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 815 | char *p; |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 816 | char *context = NULL, *defcontext = NULL; |
| 817 | char *fscontext = NULL, *rootcontext = NULL; |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 818 | int rc, num_mnt_opts = 0; |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 819 | |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 820 | opts->num_mnt_opts = 0; |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 821 | |
| 822 | /* Standard string-based options. */ |
| 823 | while ((p = strsep(&options, "|")) != NULL) { |
| 824 | int token; |
| 825 | substring_t args[MAX_OPT_ARGS]; |
| 826 | |
| 827 | if (!*p) |
| 828 | continue; |
| 829 | |
| 830 | token = match_token(p, tokens, args); |
| 831 | |
| 832 | switch (token) { |
| 833 | case Opt_context: |
| 834 | if (context || defcontext) { |
| 835 | rc = -EINVAL; |
| 836 | printk(KERN_WARNING SEL_MOUNT_FAIL_MSG); |
| 837 | goto out_err; |
| 838 | } |
| 839 | context = match_strdup(&args[0]); |
| 840 | if (!context) { |
| 841 | rc = -ENOMEM; |
| 842 | goto out_err; |
| 843 | } |
| 844 | break; |
| 845 | |
| 846 | case Opt_fscontext: |
| 847 | if (fscontext) { |
| 848 | rc = -EINVAL; |
| 849 | printk(KERN_WARNING SEL_MOUNT_FAIL_MSG); |
| 850 | goto out_err; |
| 851 | } |
| 852 | fscontext = match_strdup(&args[0]); |
| 853 | if (!fscontext) { |
| 854 | rc = -ENOMEM; |
| 855 | goto out_err; |
| 856 | } |
| 857 | break; |
| 858 | |
| 859 | case Opt_rootcontext: |
| 860 | if (rootcontext) { |
| 861 | rc = -EINVAL; |
| 862 | printk(KERN_WARNING SEL_MOUNT_FAIL_MSG); |
| 863 | goto out_err; |
| 864 | } |
| 865 | rootcontext = match_strdup(&args[0]); |
| 866 | if (!rootcontext) { |
| 867 | rc = -ENOMEM; |
| 868 | goto out_err; |
| 869 | } |
| 870 | break; |
| 871 | |
| 872 | case Opt_defcontext: |
| 873 | if (context || defcontext) { |
| 874 | rc = -EINVAL; |
| 875 | printk(KERN_WARNING SEL_MOUNT_FAIL_MSG); |
| 876 | goto out_err; |
| 877 | } |
| 878 | defcontext = match_strdup(&args[0]); |
| 879 | if (!defcontext) { |
| 880 | rc = -ENOMEM; |
| 881 | goto out_err; |
| 882 | } |
| 883 | break; |
David P. Quigley | 11689d4 | 2009-01-16 09:22:03 -0500 | [diff] [blame] | 884 | case Opt_labelsupport: |
| 885 | break; |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 886 | default: |
| 887 | rc = -EINVAL; |
| 888 | printk(KERN_WARNING "SELinux: unknown mount option\n"); |
| 889 | goto out_err; |
| 890 | |
| 891 | } |
| 892 | } |
| 893 | |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 894 | rc = -ENOMEM; |
| 895 | opts->mnt_opts = kcalloc(NUM_SEL_MNT_OPTS, sizeof(char *), GFP_ATOMIC); |
| 896 | if (!opts->mnt_opts) |
| 897 | goto out_err; |
| 898 | |
| 899 | opts->mnt_opts_flags = kcalloc(NUM_SEL_MNT_OPTS, sizeof(int), GFP_ATOMIC); |
| 900 | if (!opts->mnt_opts_flags) { |
| 901 | kfree(opts->mnt_opts); |
| 902 | goto out_err; |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 903 | } |
| 904 | |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 905 | if (fscontext) { |
| 906 | opts->mnt_opts[num_mnt_opts] = fscontext; |
| 907 | opts->mnt_opts_flags[num_mnt_opts++] = FSCONTEXT_MNT; |
| 908 | } |
| 909 | if (context) { |
| 910 | opts->mnt_opts[num_mnt_opts] = context; |
| 911 | opts->mnt_opts_flags[num_mnt_opts++] = CONTEXT_MNT; |
| 912 | } |
| 913 | if (rootcontext) { |
| 914 | opts->mnt_opts[num_mnt_opts] = rootcontext; |
| 915 | opts->mnt_opts_flags[num_mnt_opts++] = ROOTCONTEXT_MNT; |
| 916 | } |
| 917 | if (defcontext) { |
| 918 | opts->mnt_opts[num_mnt_opts] = defcontext; |
| 919 | opts->mnt_opts_flags[num_mnt_opts++] = DEFCONTEXT_MNT; |
| 920 | } |
| 921 | |
| 922 | opts->num_mnt_opts = num_mnt_opts; |
| 923 | return 0; |
| 924 | |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 925 | out_err: |
| 926 | kfree(context); |
| 927 | kfree(defcontext); |
| 928 | kfree(fscontext); |
| 929 | kfree(rootcontext); |
| 930 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 931 | } |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 932 | /* |
| 933 | * string mount options parsing and call set the sbsec |
| 934 | */ |
| 935 | static int superblock_doinit(struct super_block *sb, void *data) |
| 936 | { |
| 937 | int rc = 0; |
| 938 | char *options = data; |
| 939 | struct security_mnt_opts opts; |
| 940 | |
| 941 | security_init_mnt_opts(&opts); |
| 942 | |
| 943 | if (!data) |
| 944 | goto out; |
| 945 | |
| 946 | BUG_ON(sb->s_type->fs_flags & FS_BINARY_MOUNTDATA); |
| 947 | |
| 948 | rc = selinux_parse_opts_str(options, &opts); |
| 949 | if (rc) |
| 950 | goto out_err; |
| 951 | |
| 952 | out: |
| 953 | rc = selinux_set_mnt_opts(sb, &opts); |
| 954 | |
| 955 | out_err: |
| 956 | security_free_mnt_opts(&opts); |
| 957 | return rc; |
| 958 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 959 | |
Adrian Bunk | 3583a71 | 2008-07-22 20:21:23 +0300 | [diff] [blame] | 960 | static void selinux_write_opts(struct seq_file *m, |
| 961 | struct security_mnt_opts *opts) |
Eric Paris | 2069f45 | 2008-07-04 09:47:13 +1000 | [diff] [blame] | 962 | { |
| 963 | int i; |
| 964 | char *prefix; |
| 965 | |
| 966 | for (i = 0; i < opts->num_mnt_opts; i++) { |
David P. Quigley | 11689d4 | 2009-01-16 09:22:03 -0500 | [diff] [blame] | 967 | char *has_comma; |
| 968 | |
| 969 | if (opts->mnt_opts[i]) |
| 970 | has_comma = strchr(opts->mnt_opts[i], ','); |
| 971 | else |
| 972 | has_comma = NULL; |
Eric Paris | 2069f45 | 2008-07-04 09:47:13 +1000 | [diff] [blame] | 973 | |
| 974 | switch (opts->mnt_opts_flags[i]) { |
| 975 | case CONTEXT_MNT: |
| 976 | prefix = CONTEXT_STR; |
| 977 | break; |
| 978 | case FSCONTEXT_MNT: |
| 979 | prefix = FSCONTEXT_STR; |
| 980 | break; |
| 981 | case ROOTCONTEXT_MNT: |
| 982 | prefix = ROOTCONTEXT_STR; |
| 983 | break; |
| 984 | case DEFCONTEXT_MNT: |
| 985 | prefix = DEFCONTEXT_STR; |
| 986 | break; |
David P. Quigley | 11689d4 | 2009-01-16 09:22:03 -0500 | [diff] [blame] | 987 | case SE_SBLABELSUPP: |
| 988 | seq_putc(m, ','); |
| 989 | seq_puts(m, LABELSUPP_STR); |
| 990 | continue; |
Eric Paris | 2069f45 | 2008-07-04 09:47:13 +1000 | [diff] [blame] | 991 | default: |
| 992 | BUG(); |
| 993 | }; |
| 994 | /* we need a comma before each option */ |
| 995 | seq_putc(m, ','); |
| 996 | seq_puts(m, prefix); |
| 997 | if (has_comma) |
| 998 | seq_putc(m, '\"'); |
| 999 | seq_puts(m, opts->mnt_opts[i]); |
| 1000 | if (has_comma) |
| 1001 | seq_putc(m, '\"'); |
| 1002 | } |
| 1003 | } |
| 1004 | |
| 1005 | static int selinux_sb_show_options(struct seq_file *m, struct super_block *sb) |
| 1006 | { |
| 1007 | struct security_mnt_opts opts; |
| 1008 | int rc; |
| 1009 | |
| 1010 | rc = selinux_get_mnt_opts(sb, &opts); |
Eric Paris | 383795c | 2008-07-29 17:07:26 -0400 | [diff] [blame] | 1011 | if (rc) { |
| 1012 | /* before policy load we may get EINVAL, don't show anything */ |
| 1013 | if (rc == -EINVAL) |
| 1014 | rc = 0; |
Eric Paris | 2069f45 | 2008-07-04 09:47:13 +1000 | [diff] [blame] | 1015 | return rc; |
Eric Paris | 383795c | 2008-07-29 17:07:26 -0400 | [diff] [blame] | 1016 | } |
Eric Paris | 2069f45 | 2008-07-04 09:47:13 +1000 | [diff] [blame] | 1017 | |
| 1018 | selinux_write_opts(m, &opts); |
| 1019 | |
| 1020 | security_free_mnt_opts(&opts); |
| 1021 | |
| 1022 | return rc; |
| 1023 | } |
| 1024 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1025 | static inline u16 inode_mode_to_security_class(umode_t mode) |
| 1026 | { |
| 1027 | switch (mode & S_IFMT) { |
| 1028 | case S_IFSOCK: |
| 1029 | return SECCLASS_SOCK_FILE; |
| 1030 | case S_IFLNK: |
| 1031 | return SECCLASS_LNK_FILE; |
| 1032 | case S_IFREG: |
| 1033 | return SECCLASS_FILE; |
| 1034 | case S_IFBLK: |
| 1035 | return SECCLASS_BLK_FILE; |
| 1036 | case S_IFDIR: |
| 1037 | return SECCLASS_DIR; |
| 1038 | case S_IFCHR: |
| 1039 | return SECCLASS_CHR_FILE; |
| 1040 | case S_IFIFO: |
| 1041 | return SECCLASS_FIFO_FILE; |
| 1042 | |
| 1043 | } |
| 1044 | |
| 1045 | return SECCLASS_FILE; |
| 1046 | } |
| 1047 | |
James Morris | 1340258 | 2005-09-30 14:24:34 -0400 | [diff] [blame] | 1048 | static inline int default_protocol_stream(int protocol) |
| 1049 | { |
| 1050 | return (protocol == IPPROTO_IP || protocol == IPPROTO_TCP); |
| 1051 | } |
| 1052 | |
| 1053 | static inline int default_protocol_dgram(int protocol) |
| 1054 | { |
| 1055 | return (protocol == IPPROTO_IP || protocol == IPPROTO_UDP); |
| 1056 | } |
| 1057 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1058 | static inline u16 socket_type_to_security_class(int family, int type, int protocol) |
| 1059 | { |
| 1060 | switch (family) { |
| 1061 | case PF_UNIX: |
| 1062 | switch (type) { |
| 1063 | case SOCK_STREAM: |
| 1064 | case SOCK_SEQPACKET: |
| 1065 | return SECCLASS_UNIX_STREAM_SOCKET; |
| 1066 | case SOCK_DGRAM: |
| 1067 | return SECCLASS_UNIX_DGRAM_SOCKET; |
| 1068 | } |
| 1069 | break; |
| 1070 | case PF_INET: |
| 1071 | case PF_INET6: |
| 1072 | switch (type) { |
| 1073 | case SOCK_STREAM: |
James Morris | 1340258 | 2005-09-30 14:24:34 -0400 | [diff] [blame] | 1074 | if (default_protocol_stream(protocol)) |
| 1075 | return SECCLASS_TCP_SOCKET; |
| 1076 | else |
| 1077 | return SECCLASS_RAWIP_SOCKET; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1078 | case SOCK_DGRAM: |
James Morris | 1340258 | 2005-09-30 14:24:34 -0400 | [diff] [blame] | 1079 | if (default_protocol_dgram(protocol)) |
| 1080 | return SECCLASS_UDP_SOCKET; |
| 1081 | else |
| 1082 | return SECCLASS_RAWIP_SOCKET; |
James Morris | 2ee92d4 | 2006-11-13 16:09:01 -0800 | [diff] [blame] | 1083 | case SOCK_DCCP: |
| 1084 | return SECCLASS_DCCP_SOCKET; |
James Morris | 1340258 | 2005-09-30 14:24:34 -0400 | [diff] [blame] | 1085 | default: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1086 | return SECCLASS_RAWIP_SOCKET; |
| 1087 | } |
| 1088 | break; |
| 1089 | case PF_NETLINK: |
| 1090 | switch (protocol) { |
| 1091 | case NETLINK_ROUTE: |
| 1092 | return SECCLASS_NETLINK_ROUTE_SOCKET; |
| 1093 | case NETLINK_FIREWALL: |
| 1094 | return SECCLASS_NETLINK_FIREWALL_SOCKET; |
James Morris | 216efaa | 2005-08-15 20:34:48 -0700 | [diff] [blame] | 1095 | case NETLINK_INET_DIAG: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1096 | return SECCLASS_NETLINK_TCPDIAG_SOCKET; |
| 1097 | case NETLINK_NFLOG: |
| 1098 | return SECCLASS_NETLINK_NFLOG_SOCKET; |
| 1099 | case NETLINK_XFRM: |
| 1100 | return SECCLASS_NETLINK_XFRM_SOCKET; |
| 1101 | case NETLINK_SELINUX: |
| 1102 | return SECCLASS_NETLINK_SELINUX_SOCKET; |
| 1103 | case NETLINK_AUDIT: |
| 1104 | return SECCLASS_NETLINK_AUDIT_SOCKET; |
| 1105 | case NETLINK_IP6_FW: |
| 1106 | return SECCLASS_NETLINK_IP6FW_SOCKET; |
| 1107 | case NETLINK_DNRTMSG: |
| 1108 | return SECCLASS_NETLINK_DNRT_SOCKET; |
James Morris | 0c9b794 | 2005-04-16 15:24:13 -0700 | [diff] [blame] | 1109 | case NETLINK_KOBJECT_UEVENT: |
| 1110 | return SECCLASS_NETLINK_KOBJECT_UEVENT_SOCKET; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1111 | default: |
| 1112 | return SECCLASS_NETLINK_SOCKET; |
| 1113 | } |
| 1114 | case PF_PACKET: |
| 1115 | return SECCLASS_PACKET_SOCKET; |
| 1116 | case PF_KEY: |
| 1117 | return SECCLASS_KEY_SOCKET; |
Christopher J. PeBenito | 3e3ff15 | 2006-06-09 00:25:03 -0700 | [diff] [blame] | 1118 | case PF_APPLETALK: |
| 1119 | return SECCLASS_APPLETALK_SOCKET; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1120 | } |
| 1121 | |
| 1122 | return SECCLASS_SOCKET; |
| 1123 | } |
| 1124 | |
| 1125 | #ifdef CONFIG_PROC_FS |
Lucian Adrian Grijincu | 8e6c969 | 2011-02-01 18:42:22 +0200 | [diff] [blame] | 1126 | static int selinux_proc_get_sid(struct dentry *dentry, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1127 | u16 tclass, |
| 1128 | u32 *sid) |
| 1129 | { |
Lucian Adrian Grijincu | 8e6c969 | 2011-02-01 18:42:22 +0200 | [diff] [blame] | 1130 | int rc; |
| 1131 | char *buffer, *path; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1132 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 1133 | buffer = (char *)__get_free_page(GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1134 | if (!buffer) |
| 1135 | return -ENOMEM; |
| 1136 | |
Lucian Adrian Grijincu | 8e6c969 | 2011-02-01 18:42:22 +0200 | [diff] [blame] | 1137 | path = dentry_path_raw(dentry, buffer, PAGE_SIZE); |
| 1138 | if (IS_ERR(path)) |
| 1139 | rc = PTR_ERR(path); |
| 1140 | else { |
| 1141 | /* each process gets a /proc/PID/ entry. Strip off the |
| 1142 | * PID part to get a valid selinux labeling. |
| 1143 | * e.g. /proc/1/net/rpc/nfs -> /net/rpc/nfs */ |
| 1144 | while (path[1] >= '0' && path[1] <= '9') { |
| 1145 | path[1] = '/'; |
| 1146 | path++; |
| 1147 | } |
| 1148 | rc = security_genfs_sid("proc", path, tclass, sid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1149 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1150 | free_page((unsigned long)buffer); |
| 1151 | return rc; |
| 1152 | } |
| 1153 | #else |
Lucian Adrian Grijincu | 8e6c969 | 2011-02-01 18:42:22 +0200 | [diff] [blame] | 1154 | static int selinux_proc_get_sid(struct dentry *dentry, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1155 | u16 tclass, |
| 1156 | u32 *sid) |
| 1157 | { |
| 1158 | return -EINVAL; |
| 1159 | } |
| 1160 | #endif |
| 1161 | |
| 1162 | /* The inode's security attributes must be initialized before first use. */ |
| 1163 | static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dentry) |
| 1164 | { |
| 1165 | struct superblock_security_struct *sbsec = NULL; |
| 1166 | struct inode_security_struct *isec = inode->i_security; |
| 1167 | u32 sid; |
| 1168 | struct dentry *dentry; |
| 1169 | #define INITCONTEXTLEN 255 |
| 1170 | char *context = NULL; |
| 1171 | unsigned len = 0; |
| 1172 | int rc = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1173 | |
| 1174 | if (isec->initialized) |
| 1175 | goto out; |
| 1176 | |
Eric Paris | 2397074 | 2006-09-25 23:32:01 -0700 | [diff] [blame] | 1177 | mutex_lock(&isec->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1178 | if (isec->initialized) |
Eric Paris | 2397074 | 2006-09-25 23:32:01 -0700 | [diff] [blame] | 1179 | goto out_unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1180 | |
| 1181 | sbsec = inode->i_sb->s_security; |
David P. Quigley | 0d90a7e | 2009-01-16 09:22:02 -0500 | [diff] [blame] | 1182 | if (!(sbsec->flags & SE_SBINITIALIZED)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1183 | /* Defer initialization until selinux_complete_init, |
| 1184 | after the initial policy is loaded and the security |
| 1185 | server is ready to handle calls. */ |
| 1186 | spin_lock(&sbsec->isec_lock); |
| 1187 | if (list_empty(&isec->list)) |
| 1188 | list_add(&isec->list, &sbsec->isec_head); |
| 1189 | spin_unlock(&sbsec->isec_lock); |
Eric Paris | 2397074 | 2006-09-25 23:32:01 -0700 | [diff] [blame] | 1190 | goto out_unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1191 | } |
| 1192 | |
| 1193 | switch (sbsec->behavior) { |
| 1194 | case SECURITY_FS_USE_XATTR: |
| 1195 | if (!inode->i_op->getxattr) { |
| 1196 | isec->sid = sbsec->def_sid; |
| 1197 | break; |
| 1198 | } |
| 1199 | |
| 1200 | /* Need a dentry, since the xattr API requires one. |
| 1201 | Life would be simpler if we could just pass the inode. */ |
| 1202 | if (opt_dentry) { |
| 1203 | /* Called from d_instantiate or d_splice_alias. */ |
| 1204 | dentry = dget(opt_dentry); |
| 1205 | } else { |
| 1206 | /* Called from selinux_complete_init, try to find a dentry. */ |
| 1207 | dentry = d_find_alias(inode); |
| 1208 | } |
| 1209 | if (!dentry) { |
Eric Paris | df7f54c | 2009-03-09 14:35:58 -0400 | [diff] [blame] | 1210 | /* |
| 1211 | * this is can be hit on boot when a file is accessed |
| 1212 | * before the policy is loaded. When we load policy we |
| 1213 | * may find inodes that have no dentry on the |
| 1214 | * sbsec->isec_head list. No reason to complain as these |
| 1215 | * will get fixed up the next time we go through |
| 1216 | * inode_doinit with a dentry, before these inodes could |
| 1217 | * be used again by userspace. |
| 1218 | */ |
Eric Paris | 2397074 | 2006-09-25 23:32:01 -0700 | [diff] [blame] | 1219 | goto out_unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1220 | } |
| 1221 | |
| 1222 | len = INITCONTEXTLEN; |
Eric Paris | 4cb912f | 2009-02-12 14:50:05 -0500 | [diff] [blame] | 1223 | context = kmalloc(len+1, GFP_NOFS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1224 | if (!context) { |
| 1225 | rc = -ENOMEM; |
| 1226 | dput(dentry); |
Eric Paris | 2397074 | 2006-09-25 23:32:01 -0700 | [diff] [blame] | 1227 | goto out_unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1228 | } |
Eric Paris | 4cb912f | 2009-02-12 14:50:05 -0500 | [diff] [blame] | 1229 | context[len] = '\0'; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1230 | rc = inode->i_op->getxattr(dentry, XATTR_NAME_SELINUX, |
| 1231 | context, len); |
| 1232 | if (rc == -ERANGE) { |
James Morris | 314dabb | 2009-08-10 22:00:13 +1000 | [diff] [blame] | 1233 | kfree(context); |
| 1234 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1235 | /* Need a larger buffer. Query for the right size. */ |
| 1236 | rc = inode->i_op->getxattr(dentry, XATTR_NAME_SELINUX, |
| 1237 | NULL, 0); |
| 1238 | if (rc < 0) { |
| 1239 | dput(dentry); |
Eric Paris | 2397074 | 2006-09-25 23:32:01 -0700 | [diff] [blame] | 1240 | goto out_unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1241 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1242 | len = rc; |
Eric Paris | 4cb912f | 2009-02-12 14:50:05 -0500 | [diff] [blame] | 1243 | context = kmalloc(len+1, GFP_NOFS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1244 | if (!context) { |
| 1245 | rc = -ENOMEM; |
| 1246 | dput(dentry); |
Eric Paris | 2397074 | 2006-09-25 23:32:01 -0700 | [diff] [blame] | 1247 | goto out_unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1248 | } |
Eric Paris | 4cb912f | 2009-02-12 14:50:05 -0500 | [diff] [blame] | 1249 | context[len] = '\0'; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1250 | rc = inode->i_op->getxattr(dentry, |
| 1251 | XATTR_NAME_SELINUX, |
| 1252 | context, len); |
| 1253 | } |
| 1254 | dput(dentry); |
| 1255 | if (rc < 0) { |
| 1256 | if (rc != -ENODATA) { |
Eric Paris | 744ba35 | 2008-04-17 11:52:44 -0400 | [diff] [blame] | 1257 | printk(KERN_WARNING "SELinux: %s: getxattr returned " |
Harvey Harrison | dd6f953 | 2008-03-06 10:03:59 +1100 | [diff] [blame] | 1258 | "%d for dev=%s ino=%ld\n", __func__, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1259 | -rc, inode->i_sb->s_id, inode->i_ino); |
| 1260 | kfree(context); |
Eric Paris | 2397074 | 2006-09-25 23:32:01 -0700 | [diff] [blame] | 1261 | goto out_unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1262 | } |
| 1263 | /* Map ENODATA to the default file SID */ |
| 1264 | sid = sbsec->def_sid; |
| 1265 | rc = 0; |
| 1266 | } else { |
James Morris | f5c1d5b | 2005-07-28 01:07:37 -0700 | [diff] [blame] | 1267 | rc = security_context_to_sid_default(context, rc, &sid, |
Stephen Smalley | 869ab51 | 2008-04-04 08:46:05 -0400 | [diff] [blame] | 1268 | sbsec->def_sid, |
| 1269 | GFP_NOFS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1270 | if (rc) { |
Eric Paris | 4ba0a8a | 2009-02-12 15:01:10 -0500 | [diff] [blame] | 1271 | char *dev = inode->i_sb->s_id; |
| 1272 | unsigned long ino = inode->i_ino; |
| 1273 | |
| 1274 | if (rc == -EINVAL) { |
| 1275 | if (printk_ratelimit()) |
| 1276 | printk(KERN_NOTICE "SELinux: inode=%lu on dev=%s was found to have an invalid " |
| 1277 | "context=%s. This indicates you may need to relabel the inode or the " |
| 1278 | "filesystem in question.\n", ino, dev, context); |
| 1279 | } else { |
| 1280 | printk(KERN_WARNING "SELinux: %s: context_to_sid(%s) " |
| 1281 | "returned %d for dev=%s ino=%ld\n", |
| 1282 | __func__, context, -rc, dev, ino); |
| 1283 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1284 | kfree(context); |
| 1285 | /* Leave with the unlabeled SID */ |
| 1286 | rc = 0; |
| 1287 | break; |
| 1288 | } |
| 1289 | } |
| 1290 | kfree(context); |
| 1291 | isec->sid = sid; |
| 1292 | break; |
| 1293 | case SECURITY_FS_USE_TASK: |
| 1294 | isec->sid = isec->task_sid; |
| 1295 | break; |
| 1296 | case SECURITY_FS_USE_TRANS: |
| 1297 | /* Default to the fs SID. */ |
| 1298 | isec->sid = sbsec->sid; |
| 1299 | |
| 1300 | /* Try to obtain a transition SID. */ |
| 1301 | isec->sclass = inode_mode_to_security_class(inode->i_mode); |
Eric Paris | 652bb9b | 2011-02-01 11:05:40 -0500 | [diff] [blame] | 1302 | rc = security_transition_sid(isec->task_sid, sbsec->sid, |
| 1303 | isec->sclass, NULL, &sid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1304 | if (rc) |
Eric Paris | 2397074 | 2006-09-25 23:32:01 -0700 | [diff] [blame] | 1305 | goto out_unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1306 | isec->sid = sid; |
| 1307 | break; |
Eric Paris | c312feb | 2006-07-10 04:43:53 -0700 | [diff] [blame] | 1308 | case SECURITY_FS_USE_MNTPOINT: |
| 1309 | isec->sid = sbsec->mntpoint_sid; |
| 1310 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1311 | default: |
Eric Paris | c312feb | 2006-07-10 04:43:53 -0700 | [diff] [blame] | 1312 | /* Default to the fs superblock SID. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1313 | isec->sid = sbsec->sid; |
| 1314 | |
David P. Quigley | 0d90a7e | 2009-01-16 09:22:02 -0500 | [diff] [blame] | 1315 | if ((sbsec->flags & SE_SBPROC) && !S_ISLNK(inode->i_mode)) { |
Lucian Adrian Grijincu | 8e6c969 | 2011-02-01 18:42:22 +0200 | [diff] [blame] | 1316 | if (opt_dentry) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1317 | isec->sclass = inode_mode_to_security_class(inode->i_mode); |
Lucian Adrian Grijincu | 8e6c969 | 2011-02-01 18:42:22 +0200 | [diff] [blame] | 1318 | rc = selinux_proc_get_sid(opt_dentry, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1319 | isec->sclass, |
| 1320 | &sid); |
| 1321 | if (rc) |
Eric Paris | 2397074 | 2006-09-25 23:32:01 -0700 | [diff] [blame] | 1322 | goto out_unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1323 | isec->sid = sid; |
| 1324 | } |
| 1325 | } |
| 1326 | break; |
| 1327 | } |
| 1328 | |
| 1329 | isec->initialized = 1; |
| 1330 | |
Eric Paris | 2397074 | 2006-09-25 23:32:01 -0700 | [diff] [blame] | 1331 | out_unlock: |
| 1332 | mutex_unlock(&isec->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1333 | out: |
| 1334 | if (isec->sclass == SECCLASS_FILE) |
| 1335 | isec->sclass = inode_mode_to_security_class(inode->i_mode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1336 | return rc; |
| 1337 | } |
| 1338 | |
| 1339 | /* Convert a Linux signal to an access vector. */ |
| 1340 | static inline u32 signal_to_av(int sig) |
| 1341 | { |
| 1342 | u32 perm = 0; |
| 1343 | |
| 1344 | switch (sig) { |
| 1345 | case SIGCHLD: |
| 1346 | /* Commonly granted from child to parent. */ |
| 1347 | perm = PROCESS__SIGCHLD; |
| 1348 | break; |
| 1349 | case SIGKILL: |
| 1350 | /* Cannot be caught or ignored */ |
| 1351 | perm = PROCESS__SIGKILL; |
| 1352 | break; |
| 1353 | case SIGSTOP: |
| 1354 | /* Cannot be caught or ignored */ |
| 1355 | perm = PROCESS__SIGSTOP; |
| 1356 | break; |
| 1357 | default: |
| 1358 | /* All other signals. */ |
| 1359 | perm = PROCESS__SIGNAL; |
| 1360 | break; |
| 1361 | } |
| 1362 | |
| 1363 | return perm; |
| 1364 | } |
| 1365 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1366 | /* |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 1367 | * Check permission between a pair of credentials |
| 1368 | * fork check, ptrace check, etc. |
| 1369 | */ |
| 1370 | static int cred_has_perm(const struct cred *actor, |
| 1371 | const struct cred *target, |
| 1372 | u32 perms) |
| 1373 | { |
| 1374 | u32 asid = cred_sid(actor), tsid = cred_sid(target); |
| 1375 | |
| 1376 | return avc_has_perm(asid, tsid, SECCLASS_PROCESS, perms, NULL); |
| 1377 | } |
| 1378 | |
| 1379 | /* |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 1380 | * Check permission between a pair of tasks, e.g. signal checks, |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1381 | * fork check, ptrace check, etc. |
| 1382 | * tsk1 is the actor and tsk2 is the target |
David Howells | 3b11a1d | 2008-11-14 10:39:26 +1100 | [diff] [blame] | 1383 | * - this uses the default subjective creds of tsk1 |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1384 | */ |
| 1385 | static int task_has_perm(const struct task_struct *tsk1, |
| 1386 | const struct task_struct *tsk2, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1387 | u32 perms) |
| 1388 | { |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1389 | const struct task_security_struct *__tsec1, *__tsec2; |
| 1390 | u32 sid1, sid2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1391 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1392 | rcu_read_lock(); |
| 1393 | __tsec1 = __task_cred(tsk1)->security; sid1 = __tsec1->sid; |
| 1394 | __tsec2 = __task_cred(tsk2)->security; sid2 = __tsec2->sid; |
| 1395 | rcu_read_unlock(); |
| 1396 | return avc_has_perm(sid1, sid2, SECCLASS_PROCESS, perms, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1397 | } |
| 1398 | |
David Howells | 3b11a1d | 2008-11-14 10:39:26 +1100 | [diff] [blame] | 1399 | /* |
| 1400 | * Check permission between current and another task, e.g. signal checks, |
| 1401 | * fork check, ptrace check, etc. |
| 1402 | * current is the actor and tsk2 is the target |
| 1403 | * - this uses current's subjective creds |
| 1404 | */ |
| 1405 | static int current_has_perm(const struct task_struct *tsk, |
| 1406 | u32 perms) |
| 1407 | { |
| 1408 | u32 sid, tsid; |
| 1409 | |
| 1410 | sid = current_sid(); |
| 1411 | tsid = task_sid(tsk); |
| 1412 | return avc_has_perm(sid, tsid, SECCLASS_PROCESS, perms, NULL); |
| 1413 | } |
| 1414 | |
Stephen Smalley | b68e418 | 2008-02-07 11:21:04 -0500 | [diff] [blame] | 1415 | #if CAP_LAST_CAP > 63 |
| 1416 | #error Fix SELinux to handle capabilities > 63. |
| 1417 | #endif |
| 1418 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1419 | /* Check whether a task is allowed to use a capability. */ |
| 1420 | static int task_has_capability(struct task_struct *tsk, |
David Howells | 3699c53 | 2009-01-06 22:27:01 +0000 | [diff] [blame] | 1421 | const struct cred *cred, |
Eric Paris | 0611216 | 2008-11-11 22:02:50 +1100 | [diff] [blame] | 1422 | int cap, int audit) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1423 | { |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 1424 | struct common_audit_data ad; |
Eric Paris | 0611216 | 2008-11-11 22:02:50 +1100 | [diff] [blame] | 1425 | struct av_decision avd; |
Stephen Smalley | b68e418 | 2008-02-07 11:21:04 -0500 | [diff] [blame] | 1426 | u16 sclass; |
David Howells | 3699c53 | 2009-01-06 22:27:01 +0000 | [diff] [blame] | 1427 | u32 sid = cred_sid(cred); |
Stephen Smalley | b68e418 | 2008-02-07 11:21:04 -0500 | [diff] [blame] | 1428 | u32 av = CAP_TO_MASK(cap); |
Eric Paris | 0611216 | 2008-11-11 22:02:50 +1100 | [diff] [blame] | 1429 | int rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1430 | |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 1431 | COMMON_AUDIT_DATA_INIT(&ad, CAP); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1432 | ad.tsk = tsk; |
| 1433 | ad.u.cap = cap; |
| 1434 | |
Stephen Smalley | b68e418 | 2008-02-07 11:21:04 -0500 | [diff] [blame] | 1435 | switch (CAP_TO_INDEX(cap)) { |
| 1436 | case 0: |
| 1437 | sclass = SECCLASS_CAPABILITY; |
| 1438 | break; |
| 1439 | case 1: |
| 1440 | sclass = SECCLASS_CAPABILITY2; |
| 1441 | break; |
| 1442 | default: |
| 1443 | printk(KERN_ERR |
| 1444 | "SELinux: out of range capability %d\n", cap); |
| 1445 | BUG(); |
| 1446 | } |
Eric Paris | 0611216 | 2008-11-11 22:02:50 +1100 | [diff] [blame] | 1447 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1448 | rc = avc_has_perm_noaudit(sid, sid, sclass, av, 0, &avd); |
Eric Paris | 0611216 | 2008-11-11 22:02:50 +1100 | [diff] [blame] | 1449 | if (audit == SECURITY_CAP_AUDIT) |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1450 | avc_audit(sid, sid, sclass, av, &avd, rc, &ad); |
Eric Paris | 0611216 | 2008-11-11 22:02:50 +1100 | [diff] [blame] | 1451 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1452 | } |
| 1453 | |
| 1454 | /* Check whether a task is allowed to use a system operation. */ |
| 1455 | static int task_has_system(struct task_struct *tsk, |
| 1456 | u32 perms) |
| 1457 | { |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1458 | u32 sid = task_sid(tsk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1459 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1460 | return avc_has_perm(sid, SECINITSID_KERNEL, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1461 | SECCLASS_SYSTEM, perms, NULL); |
| 1462 | } |
| 1463 | |
| 1464 | /* Check whether a task has a particular permission to an inode. |
| 1465 | The 'adp' parameter is optional and allows other audit |
| 1466 | data to be passed (e.g. the dentry). */ |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 1467 | static int inode_has_perm(const struct cred *cred, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1468 | struct inode *inode, |
| 1469 | u32 perms, |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 1470 | struct common_audit_data *adp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1471 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1472 | struct inode_security_struct *isec; |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 1473 | struct common_audit_data ad; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1474 | u32 sid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1475 | |
David Howells | e0e8173 | 2009-09-02 09:13:40 +0100 | [diff] [blame] | 1476 | validate_creds(cred); |
| 1477 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 1478 | if (unlikely(IS_PRIVATE(inode))) |
Stephen Smalley | bbaca6c | 2007-02-14 00:34:16 -0800 | [diff] [blame] | 1479 | return 0; |
| 1480 | |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 1481 | sid = cred_sid(cred); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1482 | isec = inode->i_security; |
| 1483 | |
| 1484 | if (!adp) { |
| 1485 | adp = &ad; |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 1486 | COMMON_AUDIT_DATA_INIT(&ad, FS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1487 | ad.u.fs.inode = inode; |
| 1488 | } |
| 1489 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1490 | return avc_has_perm(sid, isec->sid, isec->sclass, perms, adp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1491 | } |
| 1492 | |
| 1493 | /* Same as inode_has_perm, but pass explicit audit data containing |
| 1494 | the dentry to help the auditing code to more easily generate the |
| 1495 | pathname if needed. */ |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 1496 | static inline int dentry_has_perm(const struct cred *cred, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1497 | struct vfsmount *mnt, |
| 1498 | struct dentry *dentry, |
| 1499 | u32 av) |
| 1500 | { |
| 1501 | struct inode *inode = dentry->d_inode; |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 1502 | struct common_audit_data ad; |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 1503 | |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 1504 | COMMON_AUDIT_DATA_INIT(&ad, FS); |
Jan Blunck | 44707fd | 2008-02-14 19:38:33 -0800 | [diff] [blame] | 1505 | ad.u.fs.path.mnt = mnt; |
| 1506 | ad.u.fs.path.dentry = dentry; |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 1507 | return inode_has_perm(cred, inode, av, &ad); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1508 | } |
| 1509 | |
| 1510 | /* Check whether a task can use an open file descriptor to |
| 1511 | access an inode in a given way. Check access to the |
| 1512 | descriptor itself, and then use dentry_has_perm to |
| 1513 | check a particular permission to the file. |
| 1514 | Access to the descriptor is implicitly granted if it |
| 1515 | has the same SID as the process. If av is zero, then |
| 1516 | access to the file is not checked, e.g. for cases |
| 1517 | where only the descriptor is affected like seek. */ |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 1518 | static int file_has_perm(const struct cred *cred, |
| 1519 | struct file *file, |
| 1520 | u32 av) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1521 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1522 | struct file_security_struct *fsec = file->f_security; |
Jan Blunck | 44707fd | 2008-02-14 19:38:33 -0800 | [diff] [blame] | 1523 | struct inode *inode = file->f_path.dentry->d_inode; |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 1524 | struct common_audit_data ad; |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 1525 | u32 sid = cred_sid(cred); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1526 | int rc; |
| 1527 | |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 1528 | COMMON_AUDIT_DATA_INIT(&ad, FS); |
Jan Blunck | 44707fd | 2008-02-14 19:38:33 -0800 | [diff] [blame] | 1529 | ad.u.fs.path = file->f_path; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1530 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1531 | if (sid != fsec->sid) { |
| 1532 | rc = avc_has_perm(sid, fsec->sid, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1533 | SECCLASS_FD, |
| 1534 | FD__USE, |
| 1535 | &ad); |
| 1536 | if (rc) |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 1537 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1538 | } |
| 1539 | |
| 1540 | /* av is zero if only checking access to the descriptor. */ |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 1541 | rc = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1542 | if (av) |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 1543 | rc = inode_has_perm(cred, inode, av, &ad); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1544 | |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 1545 | out: |
| 1546 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1547 | } |
| 1548 | |
| 1549 | /* Check whether a task can create a file. */ |
| 1550 | static int may_create(struct inode *dir, |
| 1551 | struct dentry *dentry, |
| 1552 | u16 tclass) |
| 1553 | { |
Paul Moore | 5fb4987 | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 1554 | const struct task_security_struct *tsec = current_security(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1555 | struct inode_security_struct *dsec; |
| 1556 | struct superblock_security_struct *sbsec; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1557 | u32 sid, newsid; |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 1558 | struct common_audit_data ad; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1559 | int rc; |
| 1560 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1561 | dsec = dir->i_security; |
| 1562 | sbsec = dir->i_sb->s_security; |
| 1563 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1564 | sid = tsec->sid; |
| 1565 | newsid = tsec->create_sid; |
| 1566 | |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 1567 | COMMON_AUDIT_DATA_INIT(&ad, FS); |
Jan Blunck | 44707fd | 2008-02-14 19:38:33 -0800 | [diff] [blame] | 1568 | ad.u.fs.path.dentry = dentry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1569 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1570 | rc = avc_has_perm(sid, dsec->sid, SECCLASS_DIR, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1571 | DIR__ADD_NAME | DIR__SEARCH, |
| 1572 | &ad); |
| 1573 | if (rc) |
| 1574 | return rc; |
| 1575 | |
David P. Quigley | cd89596 | 2009-01-16 09:22:04 -0500 | [diff] [blame] | 1576 | if (!newsid || !(sbsec->flags & SE_SBLABELSUPP)) { |
Eric Paris | 652bb9b | 2011-02-01 11:05:40 -0500 | [diff] [blame] | 1577 | rc = security_transition_sid(sid, dsec->sid, tclass, NULL, &newsid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1578 | if (rc) |
| 1579 | return rc; |
| 1580 | } |
| 1581 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1582 | rc = avc_has_perm(sid, newsid, tclass, FILE__CREATE, &ad); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1583 | if (rc) |
| 1584 | return rc; |
| 1585 | |
| 1586 | return avc_has_perm(newsid, sbsec->sid, |
| 1587 | SECCLASS_FILESYSTEM, |
| 1588 | FILESYSTEM__ASSOCIATE, &ad); |
| 1589 | } |
| 1590 | |
Michael LeMay | 4eb582c | 2006-06-26 00:24:57 -0700 | [diff] [blame] | 1591 | /* Check whether a task can create a key. */ |
| 1592 | static int may_create_key(u32 ksid, |
| 1593 | struct task_struct *ctx) |
| 1594 | { |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1595 | u32 sid = task_sid(ctx); |
Michael LeMay | 4eb582c | 2006-06-26 00:24:57 -0700 | [diff] [blame] | 1596 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1597 | return avc_has_perm(sid, ksid, SECCLASS_KEY, KEY__CREATE, NULL); |
Michael LeMay | 4eb582c | 2006-06-26 00:24:57 -0700 | [diff] [blame] | 1598 | } |
| 1599 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 1600 | #define MAY_LINK 0 |
| 1601 | #define MAY_UNLINK 1 |
| 1602 | #define MAY_RMDIR 2 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1603 | |
| 1604 | /* Check whether a task can link, unlink, or rmdir a file/directory. */ |
| 1605 | static int may_link(struct inode *dir, |
| 1606 | struct dentry *dentry, |
| 1607 | int kind) |
| 1608 | |
| 1609 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1610 | struct inode_security_struct *dsec, *isec; |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 1611 | struct common_audit_data ad; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1612 | u32 sid = current_sid(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1613 | u32 av; |
| 1614 | int rc; |
| 1615 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1616 | dsec = dir->i_security; |
| 1617 | isec = dentry->d_inode->i_security; |
| 1618 | |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 1619 | COMMON_AUDIT_DATA_INIT(&ad, FS); |
Jan Blunck | 44707fd | 2008-02-14 19:38:33 -0800 | [diff] [blame] | 1620 | ad.u.fs.path.dentry = dentry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1621 | |
| 1622 | av = DIR__SEARCH; |
| 1623 | av |= (kind ? DIR__REMOVE_NAME : DIR__ADD_NAME); |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1624 | rc = avc_has_perm(sid, dsec->sid, SECCLASS_DIR, av, &ad); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1625 | if (rc) |
| 1626 | return rc; |
| 1627 | |
| 1628 | switch (kind) { |
| 1629 | case MAY_LINK: |
| 1630 | av = FILE__LINK; |
| 1631 | break; |
| 1632 | case MAY_UNLINK: |
| 1633 | av = FILE__UNLINK; |
| 1634 | break; |
| 1635 | case MAY_RMDIR: |
| 1636 | av = DIR__RMDIR; |
| 1637 | break; |
| 1638 | default: |
Eric Paris | 744ba35 | 2008-04-17 11:52:44 -0400 | [diff] [blame] | 1639 | printk(KERN_WARNING "SELinux: %s: unrecognized kind %d\n", |
| 1640 | __func__, kind); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1641 | return 0; |
| 1642 | } |
| 1643 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1644 | rc = avc_has_perm(sid, isec->sid, isec->sclass, av, &ad); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1645 | return rc; |
| 1646 | } |
| 1647 | |
| 1648 | static inline int may_rename(struct inode *old_dir, |
| 1649 | struct dentry *old_dentry, |
| 1650 | struct inode *new_dir, |
| 1651 | struct dentry *new_dentry) |
| 1652 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1653 | struct inode_security_struct *old_dsec, *new_dsec, *old_isec, *new_isec; |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 1654 | struct common_audit_data ad; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1655 | u32 sid = current_sid(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1656 | u32 av; |
| 1657 | int old_is_dir, new_is_dir; |
| 1658 | int rc; |
| 1659 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1660 | old_dsec = old_dir->i_security; |
| 1661 | old_isec = old_dentry->d_inode->i_security; |
| 1662 | old_is_dir = S_ISDIR(old_dentry->d_inode->i_mode); |
| 1663 | new_dsec = new_dir->i_security; |
| 1664 | |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 1665 | COMMON_AUDIT_DATA_INIT(&ad, FS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1666 | |
Jan Blunck | 44707fd | 2008-02-14 19:38:33 -0800 | [diff] [blame] | 1667 | ad.u.fs.path.dentry = old_dentry; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1668 | rc = avc_has_perm(sid, old_dsec->sid, SECCLASS_DIR, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1669 | DIR__REMOVE_NAME | DIR__SEARCH, &ad); |
| 1670 | if (rc) |
| 1671 | return rc; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1672 | rc = avc_has_perm(sid, old_isec->sid, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1673 | old_isec->sclass, FILE__RENAME, &ad); |
| 1674 | if (rc) |
| 1675 | return rc; |
| 1676 | if (old_is_dir && new_dir != old_dir) { |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1677 | rc = avc_has_perm(sid, old_isec->sid, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1678 | old_isec->sclass, DIR__REPARENT, &ad); |
| 1679 | if (rc) |
| 1680 | return rc; |
| 1681 | } |
| 1682 | |
Jan Blunck | 44707fd | 2008-02-14 19:38:33 -0800 | [diff] [blame] | 1683 | ad.u.fs.path.dentry = new_dentry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1684 | av = DIR__ADD_NAME | DIR__SEARCH; |
| 1685 | if (new_dentry->d_inode) |
| 1686 | av |= DIR__REMOVE_NAME; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1687 | rc = avc_has_perm(sid, new_dsec->sid, SECCLASS_DIR, av, &ad); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1688 | if (rc) |
| 1689 | return rc; |
| 1690 | if (new_dentry->d_inode) { |
| 1691 | new_isec = new_dentry->d_inode->i_security; |
| 1692 | new_is_dir = S_ISDIR(new_dentry->d_inode->i_mode); |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1693 | rc = avc_has_perm(sid, new_isec->sid, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1694 | new_isec->sclass, |
| 1695 | (new_is_dir ? DIR__RMDIR : FILE__UNLINK), &ad); |
| 1696 | if (rc) |
| 1697 | return rc; |
| 1698 | } |
| 1699 | |
| 1700 | return 0; |
| 1701 | } |
| 1702 | |
| 1703 | /* Check whether a task can perform a filesystem operation. */ |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 1704 | static int superblock_has_perm(const struct cred *cred, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1705 | struct super_block *sb, |
| 1706 | u32 perms, |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 1707 | struct common_audit_data *ad) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1708 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1709 | struct superblock_security_struct *sbsec; |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 1710 | u32 sid = cred_sid(cred); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1711 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1712 | sbsec = sb->s_security; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1713 | return avc_has_perm(sid, sbsec->sid, SECCLASS_FILESYSTEM, perms, ad); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1714 | } |
| 1715 | |
| 1716 | /* Convert a Linux mode and permission mask to an access vector. */ |
| 1717 | static inline u32 file_mask_to_av(int mode, int mask) |
| 1718 | { |
| 1719 | u32 av = 0; |
| 1720 | |
| 1721 | if ((mode & S_IFMT) != S_IFDIR) { |
| 1722 | if (mask & MAY_EXEC) |
| 1723 | av |= FILE__EXECUTE; |
| 1724 | if (mask & MAY_READ) |
| 1725 | av |= FILE__READ; |
| 1726 | |
| 1727 | if (mask & MAY_APPEND) |
| 1728 | av |= FILE__APPEND; |
| 1729 | else if (mask & MAY_WRITE) |
| 1730 | av |= FILE__WRITE; |
| 1731 | |
| 1732 | } else { |
| 1733 | if (mask & MAY_EXEC) |
| 1734 | av |= DIR__SEARCH; |
| 1735 | if (mask & MAY_WRITE) |
| 1736 | av |= DIR__WRITE; |
| 1737 | if (mask & MAY_READ) |
| 1738 | av |= DIR__READ; |
| 1739 | } |
| 1740 | |
| 1741 | return av; |
| 1742 | } |
| 1743 | |
| 1744 | /* Convert a Linux file to an access vector. */ |
| 1745 | static inline u32 file_to_av(struct file *file) |
| 1746 | { |
| 1747 | u32 av = 0; |
| 1748 | |
| 1749 | if (file->f_mode & FMODE_READ) |
| 1750 | av |= FILE__READ; |
| 1751 | if (file->f_mode & FMODE_WRITE) { |
| 1752 | if (file->f_flags & O_APPEND) |
| 1753 | av |= FILE__APPEND; |
| 1754 | else |
| 1755 | av |= FILE__WRITE; |
| 1756 | } |
Stephen Smalley | 0794c66 | 2008-03-17 08:55:18 -0400 | [diff] [blame] | 1757 | if (!av) { |
| 1758 | /* |
| 1759 | * Special file opened with flags 3 for ioctl-only use. |
| 1760 | */ |
| 1761 | av = FILE__IOCTL; |
| 1762 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1763 | |
| 1764 | return av; |
| 1765 | } |
| 1766 | |
Eric Paris | 8b6a5a3 | 2008-10-29 17:06:46 -0400 | [diff] [blame] | 1767 | /* |
| 1768 | * Convert a file to an access vector and include the correct open |
| 1769 | * open permission. |
| 1770 | */ |
| 1771 | static inline u32 open_file_to_av(struct file *file) |
| 1772 | { |
| 1773 | u32 av = file_to_av(file); |
| 1774 | |
Eric Paris | 49b7b8d | 2010-07-23 11:44:09 -0400 | [diff] [blame] | 1775 | if (selinux_policycap_openperm) |
| 1776 | av |= FILE__OPEN; |
| 1777 | |
Eric Paris | 8b6a5a3 | 2008-10-29 17:06:46 -0400 | [diff] [blame] | 1778 | return av; |
| 1779 | } |
| 1780 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1781 | /* Hook functions begin here. */ |
| 1782 | |
Ingo Molnar | 9e48858 | 2009-05-07 19:26:19 +1000 | [diff] [blame] | 1783 | static int selinux_ptrace_access_check(struct task_struct *child, |
David Howells | 5cd9c58 | 2008-08-14 11:37:28 +0100 | [diff] [blame] | 1784 | unsigned int mode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1785 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1786 | int rc; |
| 1787 | |
Ingo Molnar | 9e48858 | 2009-05-07 19:26:19 +1000 | [diff] [blame] | 1788 | rc = cap_ptrace_access_check(child, mode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1789 | if (rc) |
| 1790 | return rc; |
| 1791 | |
Stephen Smalley | 006ebb4 | 2008-05-19 08:32:49 -0400 | [diff] [blame] | 1792 | if (mode == PTRACE_MODE_READ) { |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 1793 | u32 sid = current_sid(); |
| 1794 | u32 csid = task_sid(child); |
| 1795 | return avc_has_perm(sid, csid, SECCLASS_FILE, FILE__READ, NULL); |
Stephen Smalley | 006ebb4 | 2008-05-19 08:32:49 -0400 | [diff] [blame] | 1796 | } |
| 1797 | |
David Howells | 3b11a1d | 2008-11-14 10:39:26 +1100 | [diff] [blame] | 1798 | return current_has_perm(child, PROCESS__PTRACE); |
David Howells | 5cd9c58 | 2008-08-14 11:37:28 +0100 | [diff] [blame] | 1799 | } |
| 1800 | |
| 1801 | static int selinux_ptrace_traceme(struct task_struct *parent) |
| 1802 | { |
| 1803 | int rc; |
| 1804 | |
Eric Paris | 200ac53 | 2009-02-12 15:01:04 -0500 | [diff] [blame] | 1805 | rc = cap_ptrace_traceme(parent); |
David Howells | 5cd9c58 | 2008-08-14 11:37:28 +0100 | [diff] [blame] | 1806 | if (rc) |
| 1807 | return rc; |
| 1808 | |
| 1809 | return task_has_perm(parent, current, PROCESS__PTRACE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1810 | } |
| 1811 | |
| 1812 | static int selinux_capget(struct task_struct *target, kernel_cap_t *effective, |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 1813 | kernel_cap_t *inheritable, kernel_cap_t *permitted) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1814 | { |
| 1815 | int error; |
| 1816 | |
David Howells | 3b11a1d | 2008-11-14 10:39:26 +1100 | [diff] [blame] | 1817 | error = current_has_perm(target, PROCESS__GETCAP); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1818 | if (error) |
| 1819 | return error; |
| 1820 | |
Eric Paris | 200ac53 | 2009-02-12 15:01:04 -0500 | [diff] [blame] | 1821 | return cap_capget(target, effective, inheritable, permitted); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1822 | } |
| 1823 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 1824 | static int selinux_capset(struct cred *new, const struct cred *old, |
| 1825 | const kernel_cap_t *effective, |
| 1826 | const kernel_cap_t *inheritable, |
| 1827 | const kernel_cap_t *permitted) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1828 | { |
| 1829 | int error; |
| 1830 | |
Eric Paris | 200ac53 | 2009-02-12 15:01:04 -0500 | [diff] [blame] | 1831 | error = cap_capset(new, old, |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 1832 | effective, inheritable, permitted); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1833 | if (error) |
| 1834 | return error; |
| 1835 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 1836 | return cred_has_perm(old, new, PROCESS__SETCAP); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1837 | } |
| 1838 | |
James Morris | 5626d3e | 2009-01-30 10:05:06 +1100 | [diff] [blame] | 1839 | /* |
| 1840 | * (This comment used to live with the selinux_task_setuid hook, |
| 1841 | * which was removed). |
| 1842 | * |
| 1843 | * Since setuid only affects the current process, and since the SELinux |
| 1844 | * controls are not based on the Linux identity attributes, SELinux does not |
| 1845 | * need to control this operation. However, SELinux does control the use of |
| 1846 | * the CAP_SETUID and CAP_SETGID capabilities using the capable hook. |
| 1847 | */ |
| 1848 | |
David Howells | 3699c53 | 2009-01-06 22:27:01 +0000 | [diff] [blame] | 1849 | static int selinux_capable(struct task_struct *tsk, const struct cred *cred, |
Serge E. Hallyn | 3486740 | 2011-03-23 16:43:17 -0700 | [diff] [blame] | 1850 | struct user_namespace *ns, int cap, int audit) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1851 | { |
| 1852 | int rc; |
| 1853 | |
Serge E. Hallyn | 3486740 | 2011-03-23 16:43:17 -0700 | [diff] [blame] | 1854 | rc = cap_capable(tsk, cred, ns, cap, audit); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1855 | if (rc) |
| 1856 | return rc; |
| 1857 | |
David Howells | 3699c53 | 2009-01-06 22:27:01 +0000 | [diff] [blame] | 1858 | return task_has_capability(tsk, cred, cap, audit); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1859 | } |
| 1860 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1861 | static int selinux_quotactl(int cmds, int type, int id, struct super_block *sb) |
| 1862 | { |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 1863 | const struct cred *cred = current_cred(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1864 | int rc = 0; |
| 1865 | |
| 1866 | if (!sb) |
| 1867 | return 0; |
| 1868 | |
| 1869 | switch (cmds) { |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 1870 | case Q_SYNC: |
| 1871 | case Q_QUOTAON: |
| 1872 | case Q_QUOTAOFF: |
| 1873 | case Q_SETINFO: |
| 1874 | case Q_SETQUOTA: |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 1875 | rc = superblock_has_perm(cred, sb, FILESYSTEM__QUOTAMOD, NULL); |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 1876 | break; |
| 1877 | case Q_GETFMT: |
| 1878 | case Q_GETINFO: |
| 1879 | case Q_GETQUOTA: |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 1880 | rc = superblock_has_perm(cred, sb, FILESYSTEM__QUOTAGET, NULL); |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 1881 | break; |
| 1882 | default: |
| 1883 | rc = 0; /* let the kernel handle invalid cmds */ |
| 1884 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1885 | } |
| 1886 | return rc; |
| 1887 | } |
| 1888 | |
| 1889 | static int selinux_quota_on(struct dentry *dentry) |
| 1890 | { |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 1891 | const struct cred *cred = current_cred(); |
| 1892 | |
| 1893 | return dentry_has_perm(cred, NULL, dentry, FILE__QUOTAON); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1894 | } |
| 1895 | |
Eric Paris | 12b3052 | 2010-11-15 18:36:29 -0500 | [diff] [blame] | 1896 | static int selinux_syslog(int type) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1897 | { |
| 1898 | int rc; |
| 1899 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1900 | switch (type) { |
Kees Cook | d78ca3c | 2010-02-03 15:37:13 -0800 | [diff] [blame] | 1901 | case SYSLOG_ACTION_READ_ALL: /* Read last kernel messages */ |
| 1902 | case SYSLOG_ACTION_SIZE_BUFFER: /* Return size of the log buffer */ |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 1903 | rc = task_has_system(current, SYSTEM__SYSLOG_READ); |
| 1904 | break; |
Kees Cook | d78ca3c | 2010-02-03 15:37:13 -0800 | [diff] [blame] | 1905 | case SYSLOG_ACTION_CONSOLE_OFF: /* Disable logging to console */ |
| 1906 | case SYSLOG_ACTION_CONSOLE_ON: /* Enable logging to console */ |
| 1907 | /* Set level of messages printed to console */ |
| 1908 | case SYSLOG_ACTION_CONSOLE_LEVEL: |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 1909 | rc = task_has_system(current, SYSTEM__SYSLOG_CONSOLE); |
| 1910 | break; |
Kees Cook | d78ca3c | 2010-02-03 15:37:13 -0800 | [diff] [blame] | 1911 | case SYSLOG_ACTION_CLOSE: /* Close log */ |
| 1912 | case SYSLOG_ACTION_OPEN: /* Open log */ |
| 1913 | case SYSLOG_ACTION_READ: /* Read from log */ |
| 1914 | case SYSLOG_ACTION_READ_CLEAR: /* Read/clear last kernel messages */ |
| 1915 | case SYSLOG_ACTION_CLEAR: /* Clear ring buffer */ |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 1916 | default: |
| 1917 | rc = task_has_system(current, SYSTEM__SYSLOG_MOD); |
| 1918 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1919 | } |
| 1920 | return rc; |
| 1921 | } |
| 1922 | |
| 1923 | /* |
| 1924 | * Check that a process has enough memory to allocate a new virtual |
| 1925 | * mapping. 0 means there is enough memory for the allocation to |
| 1926 | * succeed and -ENOMEM implies there is not. |
| 1927 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1928 | * Do not audit the selinux permission check, as this is applied to all |
| 1929 | * processes that allocate mappings. |
| 1930 | */ |
Alan Cox | 34b4e4a | 2007-08-22 14:01:28 -0700 | [diff] [blame] | 1931 | static int selinux_vm_enough_memory(struct mm_struct *mm, long pages) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1932 | { |
| 1933 | int rc, cap_sys_admin = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1934 | |
Serge E. Hallyn | 3486740 | 2011-03-23 16:43:17 -0700 | [diff] [blame] | 1935 | rc = selinux_capable(current, current_cred(), |
| 1936 | &init_user_ns, CAP_SYS_ADMIN, |
David Howells | 3699c53 | 2009-01-06 22:27:01 +0000 | [diff] [blame] | 1937 | SECURITY_CAP_NOAUDIT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1938 | if (rc == 0) |
| 1939 | cap_sys_admin = 1; |
| 1940 | |
Alan Cox | 34b4e4a | 2007-08-22 14:01:28 -0700 | [diff] [blame] | 1941 | return __vm_enough_memory(mm, pages, cap_sys_admin); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1942 | } |
| 1943 | |
| 1944 | /* binprm security operations */ |
| 1945 | |
David Howells | a6f76f2 | 2008-11-14 10:39:24 +1100 | [diff] [blame] | 1946 | static int selinux_bprm_set_creds(struct linux_binprm *bprm) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1947 | { |
David Howells | a6f76f2 | 2008-11-14 10:39:24 +1100 | [diff] [blame] | 1948 | const struct task_security_struct *old_tsec; |
| 1949 | struct task_security_struct *new_tsec; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1950 | struct inode_security_struct *isec; |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 1951 | struct common_audit_data ad; |
David Howells | a6f76f2 | 2008-11-14 10:39:24 +1100 | [diff] [blame] | 1952 | struct inode *inode = bprm->file->f_path.dentry->d_inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1953 | int rc; |
| 1954 | |
Eric Paris | 200ac53 | 2009-02-12 15:01:04 -0500 | [diff] [blame] | 1955 | rc = cap_bprm_set_creds(bprm); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1956 | if (rc) |
| 1957 | return rc; |
| 1958 | |
David Howells | a6f76f2 | 2008-11-14 10:39:24 +1100 | [diff] [blame] | 1959 | /* SELinux context only depends on initial program or script and not |
| 1960 | * the script interpreter */ |
| 1961 | if (bprm->cred_prepared) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1962 | return 0; |
| 1963 | |
David Howells | a6f76f2 | 2008-11-14 10:39:24 +1100 | [diff] [blame] | 1964 | old_tsec = current_security(); |
| 1965 | new_tsec = bprm->cred->security; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1966 | isec = inode->i_security; |
| 1967 | |
| 1968 | /* Default to the current task SID. */ |
David Howells | a6f76f2 | 2008-11-14 10:39:24 +1100 | [diff] [blame] | 1969 | new_tsec->sid = old_tsec->sid; |
| 1970 | new_tsec->osid = old_tsec->sid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1971 | |
Michael LeMay | 28eba5b | 2006-06-27 02:53:42 -0700 | [diff] [blame] | 1972 | /* Reset fs, key, and sock SIDs on execve. */ |
David Howells | a6f76f2 | 2008-11-14 10:39:24 +1100 | [diff] [blame] | 1973 | new_tsec->create_sid = 0; |
| 1974 | new_tsec->keycreate_sid = 0; |
| 1975 | new_tsec->sockcreate_sid = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1976 | |
David Howells | a6f76f2 | 2008-11-14 10:39:24 +1100 | [diff] [blame] | 1977 | if (old_tsec->exec_sid) { |
| 1978 | new_tsec->sid = old_tsec->exec_sid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1979 | /* Reset exec SID on execve. */ |
David Howells | a6f76f2 | 2008-11-14 10:39:24 +1100 | [diff] [blame] | 1980 | new_tsec->exec_sid = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1981 | } else { |
| 1982 | /* Check for a default transition on this program. */ |
David Howells | a6f76f2 | 2008-11-14 10:39:24 +1100 | [diff] [blame] | 1983 | rc = security_transition_sid(old_tsec->sid, isec->sid, |
Eric Paris | 652bb9b | 2011-02-01 11:05:40 -0500 | [diff] [blame] | 1984 | SECCLASS_PROCESS, NULL, |
| 1985 | &new_tsec->sid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1986 | if (rc) |
| 1987 | return rc; |
| 1988 | } |
| 1989 | |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 1990 | COMMON_AUDIT_DATA_INIT(&ad, FS); |
Jan Blunck | 44707fd | 2008-02-14 19:38:33 -0800 | [diff] [blame] | 1991 | ad.u.fs.path = bprm->file->f_path; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1992 | |
Josef Sipek | 3d5ff52 | 2006-12-08 02:37:38 -0800 | [diff] [blame] | 1993 | if (bprm->file->f_path.mnt->mnt_flags & MNT_NOSUID) |
David Howells | a6f76f2 | 2008-11-14 10:39:24 +1100 | [diff] [blame] | 1994 | new_tsec->sid = old_tsec->sid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1995 | |
David Howells | a6f76f2 | 2008-11-14 10:39:24 +1100 | [diff] [blame] | 1996 | if (new_tsec->sid == old_tsec->sid) { |
| 1997 | rc = avc_has_perm(old_tsec->sid, isec->sid, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1998 | SECCLASS_FILE, FILE__EXECUTE_NO_TRANS, &ad); |
| 1999 | if (rc) |
| 2000 | return rc; |
| 2001 | } else { |
| 2002 | /* Check permissions for the transition. */ |
David Howells | a6f76f2 | 2008-11-14 10:39:24 +1100 | [diff] [blame] | 2003 | rc = avc_has_perm(old_tsec->sid, new_tsec->sid, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2004 | SECCLASS_PROCESS, PROCESS__TRANSITION, &ad); |
| 2005 | if (rc) |
| 2006 | return rc; |
| 2007 | |
David Howells | a6f76f2 | 2008-11-14 10:39:24 +1100 | [diff] [blame] | 2008 | rc = avc_has_perm(new_tsec->sid, isec->sid, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2009 | SECCLASS_FILE, FILE__ENTRYPOINT, &ad); |
| 2010 | if (rc) |
| 2011 | return rc; |
| 2012 | |
David Howells | a6f76f2 | 2008-11-14 10:39:24 +1100 | [diff] [blame] | 2013 | /* Check for shared state */ |
| 2014 | if (bprm->unsafe & LSM_UNSAFE_SHARE) { |
| 2015 | rc = avc_has_perm(old_tsec->sid, new_tsec->sid, |
| 2016 | SECCLASS_PROCESS, PROCESS__SHARE, |
| 2017 | NULL); |
| 2018 | if (rc) |
| 2019 | return -EPERM; |
| 2020 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2021 | |
David Howells | a6f76f2 | 2008-11-14 10:39:24 +1100 | [diff] [blame] | 2022 | /* Make sure that anyone attempting to ptrace over a task that |
| 2023 | * changes its SID has the appropriate permit */ |
| 2024 | if (bprm->unsafe & |
| 2025 | (LSM_UNSAFE_PTRACE | LSM_UNSAFE_PTRACE_CAP)) { |
| 2026 | struct task_struct *tracer; |
| 2027 | struct task_security_struct *sec; |
| 2028 | u32 ptsid = 0; |
| 2029 | |
| 2030 | rcu_read_lock(); |
| 2031 | tracer = tracehook_tracer_task(current); |
| 2032 | if (likely(tracer != NULL)) { |
| 2033 | sec = __task_cred(tracer)->security; |
| 2034 | ptsid = sec->sid; |
| 2035 | } |
| 2036 | rcu_read_unlock(); |
| 2037 | |
| 2038 | if (ptsid != 0) { |
| 2039 | rc = avc_has_perm(ptsid, new_tsec->sid, |
| 2040 | SECCLASS_PROCESS, |
| 2041 | PROCESS__PTRACE, NULL); |
| 2042 | if (rc) |
| 2043 | return -EPERM; |
| 2044 | } |
| 2045 | } |
| 2046 | |
| 2047 | /* Clear any possibly unsafe personality bits on exec: */ |
| 2048 | bprm->per_clear |= PER_CLEAR_ON_SETID; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2049 | } |
| 2050 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2051 | return 0; |
| 2052 | } |
| 2053 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 2054 | static int selinux_bprm_secureexec(struct linux_binprm *bprm) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2055 | { |
Paul Moore | 5fb4987 | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 2056 | const struct task_security_struct *tsec = current_security(); |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 2057 | u32 sid, osid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2058 | int atsecure = 0; |
| 2059 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 2060 | sid = tsec->sid; |
| 2061 | osid = tsec->osid; |
| 2062 | |
| 2063 | if (osid != sid) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2064 | /* Enable secure mode for SIDs transitions unless |
| 2065 | the noatsecure permission is granted between |
| 2066 | the two SIDs, i.e. ahp returns 0. */ |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 2067 | atsecure = avc_has_perm(osid, sid, |
David Howells | a6f76f2 | 2008-11-14 10:39:24 +1100 | [diff] [blame] | 2068 | SECCLASS_PROCESS, |
| 2069 | PROCESS__NOATSECURE, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2070 | } |
| 2071 | |
Eric Paris | 200ac53 | 2009-02-12 15:01:04 -0500 | [diff] [blame] | 2072 | return (atsecure || cap_bprm_secureexec(bprm)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2073 | } |
| 2074 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2075 | extern struct vfsmount *selinuxfs_mount; |
| 2076 | extern struct dentry *selinux_null; |
| 2077 | |
| 2078 | /* Derived from fs/exec.c:flush_old_files. */ |
David Howells | 745ca24 | 2008-11-14 10:39:22 +1100 | [diff] [blame] | 2079 | static inline void flush_unauthorized_files(const struct cred *cred, |
| 2080 | struct files_struct *files) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2081 | { |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 2082 | struct common_audit_data ad; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2083 | struct file *file, *devnull = NULL; |
Stephen Smalley | b20c812 | 2006-09-25 23:32:03 -0700 | [diff] [blame] | 2084 | struct tty_struct *tty; |
Dipankar Sarma | badf166 | 2005-09-09 13:04:10 -0700 | [diff] [blame] | 2085 | struct fdtable *fdt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2086 | long j = -1; |
Peter Zijlstra | 24ec839 | 2006-12-08 02:36:04 -0800 | [diff] [blame] | 2087 | int drop_tty = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2088 | |
Peter Zijlstra | 24ec839 | 2006-12-08 02:36:04 -0800 | [diff] [blame] | 2089 | tty = get_current_tty(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2090 | if (tty) { |
Nick Piggin | ee2ffa0 | 2010-08-18 04:37:35 +1000 | [diff] [blame] | 2091 | spin_lock(&tty_files_lock); |
Eric Paris | 37dd0bd | 2008-10-31 17:40:00 -0400 | [diff] [blame] | 2092 | if (!list_empty(&tty->tty_files)) { |
Nick Piggin | d996b62 | 2010-08-18 04:37:36 +1000 | [diff] [blame] | 2093 | struct tty_file_private *file_priv; |
Eric Paris | 37dd0bd | 2008-10-31 17:40:00 -0400 | [diff] [blame] | 2094 | struct inode *inode; |
| 2095 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2096 | /* Revalidate access to controlling tty. |
| 2097 | Use inode_has_perm on the tty inode directly rather |
| 2098 | than using file_has_perm, as this particular open |
| 2099 | file may belong to another process and we are only |
| 2100 | interested in the inode-based check here. */ |
Nick Piggin | d996b62 | 2010-08-18 04:37:36 +1000 | [diff] [blame] | 2101 | file_priv = list_first_entry(&tty->tty_files, |
| 2102 | struct tty_file_private, list); |
| 2103 | file = file_priv->file; |
Eric Paris | 37dd0bd | 2008-10-31 17:40:00 -0400 | [diff] [blame] | 2104 | inode = file->f_path.dentry->d_inode; |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 2105 | if (inode_has_perm(cred, inode, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2106 | FILE__READ | FILE__WRITE, NULL)) { |
Peter Zijlstra | 24ec839 | 2006-12-08 02:36:04 -0800 | [diff] [blame] | 2107 | drop_tty = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2108 | } |
| 2109 | } |
Nick Piggin | ee2ffa0 | 2010-08-18 04:37:35 +1000 | [diff] [blame] | 2110 | spin_unlock(&tty_files_lock); |
Alan Cox | 452a00d | 2008-10-13 10:39:13 +0100 | [diff] [blame] | 2111 | tty_kref_put(tty); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2112 | } |
Eric W. Biederman | 98a27ba | 2007-05-08 00:26:56 -0700 | [diff] [blame] | 2113 | /* Reset controlling tty. */ |
| 2114 | if (drop_tty) |
| 2115 | no_tty(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2116 | |
| 2117 | /* Revalidate access to inherited open files. */ |
| 2118 | |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 2119 | COMMON_AUDIT_DATA_INIT(&ad, FS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2120 | |
| 2121 | spin_lock(&files->file_lock); |
| 2122 | for (;;) { |
| 2123 | unsigned long set, i; |
| 2124 | int fd; |
| 2125 | |
| 2126 | j++; |
| 2127 | i = j * __NFDBITS; |
Dipankar Sarma | badf166 | 2005-09-09 13:04:10 -0700 | [diff] [blame] | 2128 | fdt = files_fdtable(files); |
Vadim Lobanov | bbea9f6 | 2006-12-10 02:21:12 -0800 | [diff] [blame] | 2129 | if (i >= fdt->max_fds) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2130 | break; |
Dipankar Sarma | badf166 | 2005-09-09 13:04:10 -0700 | [diff] [blame] | 2131 | set = fdt->open_fds->fds_bits[j]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2132 | if (!set) |
| 2133 | continue; |
| 2134 | spin_unlock(&files->file_lock); |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 2135 | for ( ; set ; i++, set >>= 1) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2136 | if (set & 1) { |
| 2137 | file = fget(i); |
| 2138 | if (!file) |
| 2139 | continue; |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 2140 | if (file_has_perm(cred, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2141 | file, |
| 2142 | file_to_av(file))) { |
| 2143 | sys_close(i); |
| 2144 | fd = get_unused_fd(); |
| 2145 | if (fd != i) { |
| 2146 | if (fd >= 0) |
| 2147 | put_unused_fd(fd); |
| 2148 | fput(file); |
| 2149 | continue; |
| 2150 | } |
| 2151 | if (devnull) { |
Nick Piggin | 095975d | 2006-01-08 01:02:19 -0800 | [diff] [blame] | 2152 | get_file(devnull); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2153 | } else { |
David Howells | 745ca24 | 2008-11-14 10:39:22 +1100 | [diff] [blame] | 2154 | devnull = dentry_open( |
| 2155 | dget(selinux_null), |
| 2156 | mntget(selinuxfs_mount), |
| 2157 | O_RDWR, cred); |
Akinobu Mita | fc5d81e | 2006-11-27 15:16:48 +0900 | [diff] [blame] | 2158 | if (IS_ERR(devnull)) { |
| 2159 | devnull = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2160 | put_unused_fd(fd); |
| 2161 | fput(file); |
| 2162 | continue; |
| 2163 | } |
| 2164 | } |
| 2165 | fd_install(fd, devnull); |
| 2166 | } |
| 2167 | fput(file); |
| 2168 | } |
| 2169 | } |
| 2170 | spin_lock(&files->file_lock); |
| 2171 | |
| 2172 | } |
| 2173 | spin_unlock(&files->file_lock); |
| 2174 | } |
| 2175 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2176 | /* |
David Howells | a6f76f2 | 2008-11-14 10:39:24 +1100 | [diff] [blame] | 2177 | * Prepare a process for imminent new credential changes due to exec |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2178 | */ |
David Howells | a6f76f2 | 2008-11-14 10:39:24 +1100 | [diff] [blame] | 2179 | static void selinux_bprm_committing_creds(struct linux_binprm *bprm) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2180 | { |
David Howells | a6f76f2 | 2008-11-14 10:39:24 +1100 | [diff] [blame] | 2181 | struct task_security_struct *new_tsec; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2182 | struct rlimit *rlim, *initrlim; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2183 | int rc, i; |
| 2184 | |
David Howells | a6f76f2 | 2008-11-14 10:39:24 +1100 | [diff] [blame] | 2185 | new_tsec = bprm->cred->security; |
| 2186 | if (new_tsec->sid == new_tsec->osid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2187 | return; |
| 2188 | |
| 2189 | /* Close files for which the new task SID is not authorized. */ |
David Howells | a6f76f2 | 2008-11-14 10:39:24 +1100 | [diff] [blame] | 2190 | flush_unauthorized_files(bprm->cred, current->files); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2191 | |
David Howells | a6f76f2 | 2008-11-14 10:39:24 +1100 | [diff] [blame] | 2192 | /* Always clear parent death signal on SID transitions. */ |
| 2193 | current->pdeath_signal = 0; |
| 2194 | |
| 2195 | /* Check whether the new SID can inherit resource limits from the old |
| 2196 | * SID. If not, reset all soft limits to the lower of the current |
| 2197 | * task's hard limit and the init task's soft limit. |
| 2198 | * |
| 2199 | * Note that the setting of hard limits (even to lower them) can be |
| 2200 | * controlled by the setrlimit check. The inclusion of the init task's |
| 2201 | * soft limit into the computation is to avoid resetting soft limits |
| 2202 | * higher than the default soft limit for cases where the default is |
| 2203 | * lower than the hard limit, e.g. RLIMIT_CORE or RLIMIT_STACK. |
| 2204 | */ |
| 2205 | rc = avc_has_perm(new_tsec->osid, new_tsec->sid, SECCLASS_PROCESS, |
| 2206 | PROCESS__RLIMITINH, NULL); |
| 2207 | if (rc) { |
Oleg Nesterov | eb2d55a | 2010-06-23 22:43:32 +0200 | [diff] [blame] | 2208 | /* protect against do_prlimit() */ |
| 2209 | task_lock(current); |
David Howells | a6f76f2 | 2008-11-14 10:39:24 +1100 | [diff] [blame] | 2210 | for (i = 0; i < RLIM_NLIMITS; i++) { |
| 2211 | rlim = current->signal->rlim + i; |
| 2212 | initrlim = init_task.signal->rlim + i; |
| 2213 | rlim->rlim_cur = min(rlim->rlim_max, initrlim->rlim_cur); |
| 2214 | } |
Oleg Nesterov | eb2d55a | 2010-06-23 22:43:32 +0200 | [diff] [blame] | 2215 | task_unlock(current); |
| 2216 | update_rlimit_cpu(current, rlimit(RLIMIT_CPU)); |
David Howells | a6f76f2 | 2008-11-14 10:39:24 +1100 | [diff] [blame] | 2217 | } |
| 2218 | } |
| 2219 | |
| 2220 | /* |
| 2221 | * Clean up the process immediately after the installation of new credentials |
| 2222 | * due to exec |
| 2223 | */ |
| 2224 | static void selinux_bprm_committed_creds(struct linux_binprm *bprm) |
| 2225 | { |
| 2226 | const struct task_security_struct *tsec = current_security(); |
| 2227 | struct itimerval itimer; |
David Howells | a6f76f2 | 2008-11-14 10:39:24 +1100 | [diff] [blame] | 2228 | u32 osid, sid; |
| 2229 | int rc, i; |
David Howells | a6f76f2 | 2008-11-14 10:39:24 +1100 | [diff] [blame] | 2230 | |
David Howells | a6f76f2 | 2008-11-14 10:39:24 +1100 | [diff] [blame] | 2231 | osid = tsec->osid; |
| 2232 | sid = tsec->sid; |
| 2233 | |
| 2234 | if (sid == osid) |
| 2235 | return; |
| 2236 | |
| 2237 | /* Check whether the new SID can inherit signal state from the old SID. |
| 2238 | * If not, clear itimers to avoid subsequent signal generation and |
| 2239 | * flush and unblock signals. |
| 2240 | * |
| 2241 | * This must occur _after_ the task SID has been updated so that any |
| 2242 | * kill done after the flush will be checked against the new SID. |
| 2243 | */ |
| 2244 | rc = avc_has_perm(osid, sid, SECCLASS_PROCESS, PROCESS__SIGINH, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2245 | if (rc) { |
| 2246 | memset(&itimer, 0, sizeof itimer); |
| 2247 | for (i = 0; i < 3; i++) |
| 2248 | do_setitimer(i, &itimer, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2249 | spin_lock_irq(¤t->sighand->siglock); |
David Howells | 3bcac02 | 2009-04-29 13:45:05 +0100 | [diff] [blame] | 2250 | if (!(current->signal->flags & SIGNAL_GROUP_EXIT)) { |
| 2251 | __flush_signals(current); |
| 2252 | flush_signal_handlers(current, 1); |
| 2253 | sigemptyset(¤t->blocked); |
| 2254 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2255 | spin_unlock_irq(¤t->sighand->siglock); |
| 2256 | } |
| 2257 | |
David Howells | a6f76f2 | 2008-11-14 10:39:24 +1100 | [diff] [blame] | 2258 | /* Wake up the parent if it is waiting so that it can recheck |
| 2259 | * wait permission to the new task SID. */ |
Oleg Nesterov | ecd6de3 | 2009-04-29 16:02:24 +0200 | [diff] [blame] | 2260 | read_lock(&tasklist_lock); |
Oleg Nesterov | 0b7570e | 2009-09-23 15:56:46 -0700 | [diff] [blame] | 2261 | __wake_up_parent(current, current->real_parent); |
Oleg Nesterov | ecd6de3 | 2009-04-29 16:02:24 +0200 | [diff] [blame] | 2262 | read_unlock(&tasklist_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2263 | } |
| 2264 | |
| 2265 | /* superblock security operations */ |
| 2266 | |
| 2267 | static int selinux_sb_alloc_security(struct super_block *sb) |
| 2268 | { |
| 2269 | return superblock_alloc_security(sb); |
| 2270 | } |
| 2271 | |
| 2272 | static void selinux_sb_free_security(struct super_block *sb) |
| 2273 | { |
| 2274 | superblock_free_security(sb); |
| 2275 | } |
| 2276 | |
| 2277 | static inline int match_prefix(char *prefix, int plen, char *option, int olen) |
| 2278 | { |
| 2279 | if (plen > olen) |
| 2280 | return 0; |
| 2281 | |
| 2282 | return !memcmp(prefix, option, plen); |
| 2283 | } |
| 2284 | |
| 2285 | static inline int selinux_option(char *option, int len) |
| 2286 | { |
Eric Paris | 832cbd9 | 2008-04-01 13:24:09 -0400 | [diff] [blame] | 2287 | return (match_prefix(CONTEXT_STR, sizeof(CONTEXT_STR)-1, option, len) || |
| 2288 | match_prefix(FSCONTEXT_STR, sizeof(FSCONTEXT_STR)-1, option, len) || |
| 2289 | match_prefix(DEFCONTEXT_STR, sizeof(DEFCONTEXT_STR)-1, option, len) || |
David P. Quigley | 11689d4 | 2009-01-16 09:22:03 -0500 | [diff] [blame] | 2290 | match_prefix(ROOTCONTEXT_STR, sizeof(ROOTCONTEXT_STR)-1, option, len) || |
| 2291 | match_prefix(LABELSUPP_STR, sizeof(LABELSUPP_STR)-1, option, len)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2292 | } |
| 2293 | |
| 2294 | static inline void take_option(char **to, char *from, int *first, int len) |
| 2295 | { |
| 2296 | if (!*first) { |
| 2297 | **to = ','; |
| 2298 | *to += 1; |
Cory Olmo | 3528a95 | 2006-09-29 01:58:44 -0700 | [diff] [blame] | 2299 | } else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2300 | *first = 0; |
| 2301 | memcpy(*to, from, len); |
| 2302 | *to += len; |
| 2303 | } |
| 2304 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 2305 | static inline void take_selinux_option(char **to, char *from, int *first, |
| 2306 | int len) |
Cory Olmo | 3528a95 | 2006-09-29 01:58:44 -0700 | [diff] [blame] | 2307 | { |
| 2308 | int current_size = 0; |
| 2309 | |
| 2310 | if (!*first) { |
| 2311 | **to = '|'; |
| 2312 | *to += 1; |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 2313 | } else |
Cory Olmo | 3528a95 | 2006-09-29 01:58:44 -0700 | [diff] [blame] | 2314 | *first = 0; |
| 2315 | |
| 2316 | while (current_size < len) { |
| 2317 | if (*from != '"') { |
| 2318 | **to = *from; |
| 2319 | *to += 1; |
| 2320 | } |
| 2321 | from += 1; |
| 2322 | current_size += 1; |
| 2323 | } |
| 2324 | } |
| 2325 | |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 2326 | static int selinux_sb_copy_data(char *orig, char *copy) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2327 | { |
| 2328 | int fnosec, fsec, rc = 0; |
| 2329 | char *in_save, *in_curr, *in_end; |
| 2330 | char *sec_curr, *nosec_save, *nosec; |
Cory Olmo | 3528a95 | 2006-09-29 01:58:44 -0700 | [diff] [blame] | 2331 | int open_quote = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2332 | |
| 2333 | in_curr = orig; |
| 2334 | sec_curr = copy; |
| 2335 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2336 | nosec = (char *)get_zeroed_page(GFP_KERNEL); |
| 2337 | if (!nosec) { |
| 2338 | rc = -ENOMEM; |
| 2339 | goto out; |
| 2340 | } |
| 2341 | |
| 2342 | nosec_save = nosec; |
| 2343 | fnosec = fsec = 1; |
| 2344 | in_save = in_end = orig; |
| 2345 | |
| 2346 | do { |
Cory Olmo | 3528a95 | 2006-09-29 01:58:44 -0700 | [diff] [blame] | 2347 | if (*in_end == '"') |
| 2348 | open_quote = !open_quote; |
| 2349 | if ((*in_end == ',' && open_quote == 0) || |
| 2350 | *in_end == '\0') { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2351 | int len = in_end - in_curr; |
| 2352 | |
| 2353 | if (selinux_option(in_curr, len)) |
Cory Olmo | 3528a95 | 2006-09-29 01:58:44 -0700 | [diff] [blame] | 2354 | take_selinux_option(&sec_curr, in_curr, &fsec, len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2355 | else |
| 2356 | take_option(&nosec, in_curr, &fnosec, len); |
| 2357 | |
| 2358 | in_curr = in_end + 1; |
| 2359 | } |
| 2360 | } while (*in_end++); |
| 2361 | |
Eric Paris | 6931dfc | 2005-06-30 02:58:51 -0700 | [diff] [blame] | 2362 | strcpy(in_save, nosec_save); |
Gerald Schaefer | da3caa2 | 2005-06-21 17:15:18 -0700 | [diff] [blame] | 2363 | free_page((unsigned long)nosec_save); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2364 | out: |
| 2365 | return rc; |
| 2366 | } |
| 2367 | |
Eric Paris | 026eb16 | 2011-03-03 16:09:14 -0500 | [diff] [blame] | 2368 | static int selinux_sb_remount(struct super_block *sb, void *data) |
| 2369 | { |
| 2370 | int rc, i, *flags; |
| 2371 | struct security_mnt_opts opts; |
| 2372 | char *secdata, **mount_options; |
| 2373 | struct superblock_security_struct *sbsec = sb->s_security; |
| 2374 | |
| 2375 | if (!(sbsec->flags & SE_SBINITIALIZED)) |
| 2376 | return 0; |
| 2377 | |
| 2378 | if (!data) |
| 2379 | return 0; |
| 2380 | |
| 2381 | if (sb->s_type->fs_flags & FS_BINARY_MOUNTDATA) |
| 2382 | return 0; |
| 2383 | |
| 2384 | security_init_mnt_opts(&opts); |
| 2385 | secdata = alloc_secdata(); |
| 2386 | if (!secdata) |
| 2387 | return -ENOMEM; |
| 2388 | rc = selinux_sb_copy_data(data, secdata); |
| 2389 | if (rc) |
| 2390 | goto out_free_secdata; |
| 2391 | |
| 2392 | rc = selinux_parse_opts_str(secdata, &opts); |
| 2393 | if (rc) |
| 2394 | goto out_free_secdata; |
| 2395 | |
| 2396 | mount_options = opts.mnt_opts; |
| 2397 | flags = opts.mnt_opts_flags; |
| 2398 | |
| 2399 | for (i = 0; i < opts.num_mnt_opts; i++) { |
| 2400 | u32 sid; |
| 2401 | size_t len; |
| 2402 | |
| 2403 | if (flags[i] == SE_SBLABELSUPP) |
| 2404 | continue; |
| 2405 | len = strlen(mount_options[i]); |
| 2406 | rc = security_context_to_sid(mount_options[i], len, &sid); |
| 2407 | if (rc) { |
| 2408 | printk(KERN_WARNING "SELinux: security_context_to_sid" |
| 2409 | "(%s) failed for (dev %s, type %s) errno=%d\n", |
| 2410 | mount_options[i], sb->s_id, sb->s_type->name, rc); |
| 2411 | goto out_free_opts; |
| 2412 | } |
| 2413 | rc = -EINVAL; |
| 2414 | switch (flags[i]) { |
| 2415 | case FSCONTEXT_MNT: |
| 2416 | if (bad_option(sbsec, FSCONTEXT_MNT, sbsec->sid, sid)) |
| 2417 | goto out_bad_option; |
| 2418 | break; |
| 2419 | case CONTEXT_MNT: |
| 2420 | if (bad_option(sbsec, CONTEXT_MNT, sbsec->mntpoint_sid, sid)) |
| 2421 | goto out_bad_option; |
| 2422 | break; |
| 2423 | case ROOTCONTEXT_MNT: { |
| 2424 | struct inode_security_struct *root_isec; |
| 2425 | root_isec = sb->s_root->d_inode->i_security; |
| 2426 | |
| 2427 | if (bad_option(sbsec, ROOTCONTEXT_MNT, root_isec->sid, sid)) |
| 2428 | goto out_bad_option; |
| 2429 | break; |
| 2430 | } |
| 2431 | case DEFCONTEXT_MNT: |
| 2432 | if (bad_option(sbsec, DEFCONTEXT_MNT, sbsec->def_sid, sid)) |
| 2433 | goto out_bad_option; |
| 2434 | break; |
| 2435 | default: |
| 2436 | goto out_free_opts; |
| 2437 | } |
| 2438 | } |
| 2439 | |
| 2440 | rc = 0; |
| 2441 | out_free_opts: |
| 2442 | security_free_mnt_opts(&opts); |
| 2443 | out_free_secdata: |
| 2444 | free_secdata(secdata); |
| 2445 | return rc; |
| 2446 | out_bad_option: |
| 2447 | printk(KERN_WARNING "SELinux: unable to change security options " |
| 2448 | "during remount (dev %s, type=%s)\n", sb->s_id, |
| 2449 | sb->s_type->name); |
| 2450 | goto out_free_opts; |
| 2451 | } |
| 2452 | |
James Morris | 12204e2 | 2008-12-19 10:44:42 +1100 | [diff] [blame] | 2453 | 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] | 2454 | { |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 2455 | const struct cred *cred = current_cred(); |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 2456 | struct common_audit_data ad; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2457 | int rc; |
| 2458 | |
| 2459 | rc = superblock_doinit(sb, data); |
| 2460 | if (rc) |
| 2461 | return rc; |
| 2462 | |
James Morris | 7419224 | 2008-12-19 11:41:10 +1100 | [diff] [blame] | 2463 | /* Allow all mounts performed by the kernel */ |
| 2464 | if (flags & MS_KERNMOUNT) |
| 2465 | return 0; |
| 2466 | |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 2467 | COMMON_AUDIT_DATA_INIT(&ad, FS); |
Jan Blunck | 44707fd | 2008-02-14 19:38:33 -0800 | [diff] [blame] | 2468 | ad.u.fs.path.dentry = sb->s_root; |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 2469 | return superblock_has_perm(cred, sb, FILESYSTEM__MOUNT, &ad); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2470 | } |
| 2471 | |
David Howells | 726c334 | 2006-06-23 02:02:58 -0700 | [diff] [blame] | 2472 | static int selinux_sb_statfs(struct dentry *dentry) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2473 | { |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 2474 | const struct cred *cred = current_cred(); |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 2475 | struct common_audit_data ad; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2476 | |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 2477 | COMMON_AUDIT_DATA_INIT(&ad, FS); |
Jan Blunck | 44707fd | 2008-02-14 19:38:33 -0800 | [diff] [blame] | 2478 | ad.u.fs.path.dentry = dentry->d_sb->s_root; |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 2479 | return superblock_has_perm(cred, dentry->d_sb, FILESYSTEM__GETATTR, &ad); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2480 | } |
| 2481 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 2482 | static int selinux_mount(char *dev_name, |
Al Viro | b5266eb | 2008-03-22 17:48:24 -0400 | [diff] [blame] | 2483 | struct path *path, |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 2484 | char *type, |
| 2485 | unsigned long flags, |
| 2486 | void *data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2487 | { |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 2488 | const struct cred *cred = current_cred(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2489 | |
| 2490 | if (flags & MS_REMOUNT) |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 2491 | return superblock_has_perm(cred, path->mnt->mnt_sb, |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 2492 | FILESYSTEM__REMOUNT, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2493 | else |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 2494 | return dentry_has_perm(cred, path->mnt, path->dentry, |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 2495 | 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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2583 | static int selinux_inode_create(struct inode *dir, struct dentry *dentry, int mask) |
| 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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2603 | static int selinux_inode_mkdir(struct inode *dir, struct dentry *dentry, int mask) |
| 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 | |
| 2613 | static int selinux_inode_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev) |
| 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 | |
| 2628 | return dentry_has_perm(cred, NULL, 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 | |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 2635 | return dentry_has_perm(cred, NULL, dentry, FILE__READ); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2636 | } |
| 2637 | |
Al Viro | b77b064 | 2008-07-17 09:37:02 -0400 | [diff] [blame] | 2638 | static int selinux_inode_permission(struct inode *inode, int mask) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2639 | { |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 2640 | const struct cred *cred = current_cred(); |
Eric Paris | b782e0a | 2010-07-23 11:44:03 -0400 | [diff] [blame] | 2641 | struct common_audit_data ad; |
| 2642 | u32 perms; |
| 2643 | bool from_access; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2644 | |
Eric Paris | b782e0a | 2010-07-23 11:44:03 -0400 | [diff] [blame] | 2645 | from_access = mask & MAY_ACCESS; |
Eric Paris | d09ca73 | 2010-07-23 11:43:57 -0400 | [diff] [blame] | 2646 | mask &= (MAY_READ|MAY_WRITE|MAY_EXEC|MAY_APPEND); |
| 2647 | |
Eric Paris | b782e0a | 2010-07-23 11:44:03 -0400 | [diff] [blame] | 2648 | /* No permission to check. Existence test. */ |
| 2649 | if (!mask) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2650 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2651 | |
Eric Paris | b782e0a | 2010-07-23 11:44:03 -0400 | [diff] [blame] | 2652 | COMMON_AUDIT_DATA_INIT(&ad, FS); |
| 2653 | ad.u.fs.inode = inode; |
| 2654 | |
| 2655 | if (from_access) |
| 2656 | ad.selinux_audit_data.auditdeny |= FILE__AUDIT_ACCESS; |
| 2657 | |
| 2658 | perms = file_mask_to_av(inode->i_mode, mask); |
| 2659 | |
| 2660 | return inode_has_perm(cred, inode, perms, &ad); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2661 | } |
| 2662 | |
| 2663 | static int selinux_inode_setattr(struct dentry *dentry, struct iattr *iattr) |
| 2664 | { |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 2665 | const struct cred *cred = current_cred(); |
Amerigo Wang | bc6a600 | 2009-08-20 19:29:02 -0700 | [diff] [blame] | 2666 | unsigned int ia_valid = iattr->ia_valid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2667 | |
Amerigo Wang | bc6a600 | 2009-08-20 19:29:02 -0700 | [diff] [blame] | 2668 | /* ATTR_FORCE is just used for ATTR_KILL_S[UG]ID. */ |
| 2669 | if (ia_valid & ATTR_FORCE) { |
| 2670 | ia_valid &= ~(ATTR_KILL_SUID | ATTR_KILL_SGID | ATTR_MODE | |
| 2671 | ATTR_FORCE); |
| 2672 | if (!ia_valid) |
| 2673 | return 0; |
| 2674 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2675 | |
Amerigo Wang | bc6a600 | 2009-08-20 19:29:02 -0700 | [diff] [blame] | 2676 | if (ia_valid & (ATTR_MODE | ATTR_UID | ATTR_GID | |
| 2677 | ATTR_ATIME_SET | ATTR_MTIME_SET | ATTR_TIMES_SET)) |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 2678 | return dentry_has_perm(cred, NULL, dentry, FILE__SETATTR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2679 | |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 2680 | return dentry_has_perm(cred, NULL, dentry, FILE__WRITE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2681 | } |
| 2682 | |
| 2683 | static int selinux_inode_getattr(struct vfsmount *mnt, struct dentry *dentry) |
| 2684 | { |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 2685 | const struct cred *cred = current_cred(); |
| 2686 | |
| 2687 | return dentry_has_perm(cred, mnt, dentry, FILE__GETATTR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2688 | } |
| 2689 | |
David Howells | 8f0cfa5 | 2008-04-29 00:59:41 -0700 | [diff] [blame] | 2690 | static int selinux_inode_setotherxattr(struct dentry *dentry, const char *name) |
Serge E. Hallyn | b537677 | 2007-10-16 23:31:36 -0700 | [diff] [blame] | 2691 | { |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 2692 | const struct cred *cred = current_cred(); |
| 2693 | |
Serge E. Hallyn | b537677 | 2007-10-16 23:31:36 -0700 | [diff] [blame] | 2694 | if (!strncmp(name, XATTR_SECURITY_PREFIX, |
| 2695 | sizeof XATTR_SECURITY_PREFIX - 1)) { |
| 2696 | if (!strcmp(name, XATTR_NAME_CAPS)) { |
| 2697 | if (!capable(CAP_SETFCAP)) |
| 2698 | return -EPERM; |
| 2699 | } else if (!capable(CAP_SYS_ADMIN)) { |
| 2700 | /* A different attribute in the security namespace. |
| 2701 | Restrict to administrator. */ |
| 2702 | return -EPERM; |
| 2703 | } |
| 2704 | } |
| 2705 | |
| 2706 | /* Not an attribute we recognize, so just check the |
| 2707 | ordinary setattr permission. */ |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 2708 | return dentry_has_perm(cred, NULL, dentry, FILE__SETATTR); |
Serge E. Hallyn | b537677 | 2007-10-16 23:31:36 -0700 | [diff] [blame] | 2709 | } |
| 2710 | |
David Howells | 8f0cfa5 | 2008-04-29 00:59:41 -0700 | [diff] [blame] | 2711 | static int selinux_inode_setxattr(struct dentry *dentry, const char *name, |
| 2712 | const void *value, size_t size, int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2713 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2714 | struct inode *inode = dentry->d_inode; |
| 2715 | struct inode_security_struct *isec = inode->i_security; |
| 2716 | struct superblock_security_struct *sbsec; |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 2717 | struct common_audit_data ad; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 2718 | u32 newsid, sid = current_sid(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2719 | int rc = 0; |
| 2720 | |
Serge E. Hallyn | b537677 | 2007-10-16 23:31:36 -0700 | [diff] [blame] | 2721 | if (strcmp(name, XATTR_NAME_SELINUX)) |
| 2722 | return selinux_inode_setotherxattr(dentry, name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2723 | |
| 2724 | sbsec = inode->i_sb->s_security; |
David P. Quigley | cd89596 | 2009-01-16 09:22:04 -0500 | [diff] [blame] | 2725 | if (!(sbsec->flags & SE_SBLABELSUPP)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2726 | return -EOPNOTSUPP; |
| 2727 | |
Serge E. Hallyn | 2e14967 | 2011-03-23 16:43:26 -0700 | [diff] [blame] | 2728 | if (!inode_owner_or_capable(inode)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2729 | return -EPERM; |
| 2730 | |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 2731 | COMMON_AUDIT_DATA_INIT(&ad, FS); |
Jan Blunck | 44707fd | 2008-02-14 19:38:33 -0800 | [diff] [blame] | 2732 | ad.u.fs.path.dentry = dentry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2733 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 2734 | rc = avc_has_perm(sid, isec->sid, isec->sclass, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2735 | FILE__RELABELFROM, &ad); |
| 2736 | if (rc) |
| 2737 | return rc; |
| 2738 | |
| 2739 | rc = security_context_to_sid(value, size, &newsid); |
Stephen Smalley | 12b29f3 | 2008-05-07 13:03:20 -0400 | [diff] [blame] | 2740 | if (rc == -EINVAL) { |
| 2741 | if (!capable(CAP_MAC_ADMIN)) |
| 2742 | return rc; |
| 2743 | rc = security_context_to_sid_force(value, size, &newsid); |
| 2744 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2745 | if (rc) |
| 2746 | return rc; |
| 2747 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 2748 | rc = avc_has_perm(sid, newsid, isec->sclass, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2749 | FILE__RELABELTO, &ad); |
| 2750 | if (rc) |
| 2751 | return rc; |
| 2752 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 2753 | rc = security_validate_transition(isec->sid, newsid, sid, |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 2754 | isec->sclass); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2755 | if (rc) |
| 2756 | return rc; |
| 2757 | |
| 2758 | return avc_has_perm(newsid, |
| 2759 | sbsec->sid, |
| 2760 | SECCLASS_FILESYSTEM, |
| 2761 | FILESYSTEM__ASSOCIATE, |
| 2762 | &ad); |
| 2763 | } |
| 2764 | |
David Howells | 8f0cfa5 | 2008-04-29 00:59:41 -0700 | [diff] [blame] | 2765 | static void selinux_inode_post_setxattr(struct dentry *dentry, const char *name, |
Eric Paris | f526971 | 2008-05-14 11:27:45 -0400 | [diff] [blame] | 2766 | const void *value, size_t size, |
David Howells | 8f0cfa5 | 2008-04-29 00:59:41 -0700 | [diff] [blame] | 2767 | int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2768 | { |
| 2769 | struct inode *inode = dentry->d_inode; |
| 2770 | struct inode_security_struct *isec = inode->i_security; |
| 2771 | u32 newsid; |
| 2772 | int rc; |
| 2773 | |
| 2774 | if (strcmp(name, XATTR_NAME_SELINUX)) { |
| 2775 | /* Not an attribute we recognize, so nothing to do. */ |
| 2776 | return; |
| 2777 | } |
| 2778 | |
Stephen Smalley | 12b29f3 | 2008-05-07 13:03:20 -0400 | [diff] [blame] | 2779 | rc = security_context_to_sid_force(value, size, &newsid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2780 | if (rc) { |
Stephen Smalley | 12b29f3 | 2008-05-07 13:03:20 -0400 | [diff] [blame] | 2781 | printk(KERN_ERR "SELinux: unable to map context to SID" |
| 2782 | "for (%s, %lu), rc=%d\n", |
| 2783 | inode->i_sb->s_id, inode->i_ino, -rc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2784 | return; |
| 2785 | } |
| 2786 | |
| 2787 | isec->sid = newsid; |
| 2788 | return; |
| 2789 | } |
| 2790 | |
David Howells | 8f0cfa5 | 2008-04-29 00:59:41 -0700 | [diff] [blame] | 2791 | static int selinux_inode_getxattr(struct dentry *dentry, const char *name) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2792 | { |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 2793 | const struct cred *cred = current_cred(); |
| 2794 | |
| 2795 | return dentry_has_perm(cred, NULL, dentry, FILE__GETATTR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2796 | } |
| 2797 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 2798 | static int selinux_inode_listxattr(struct dentry *dentry) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2799 | { |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 2800 | const struct cred *cred = current_cred(); |
| 2801 | |
| 2802 | return dentry_has_perm(cred, NULL, dentry, FILE__GETATTR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2803 | } |
| 2804 | |
David Howells | 8f0cfa5 | 2008-04-29 00:59:41 -0700 | [diff] [blame] | 2805 | static int selinux_inode_removexattr(struct dentry *dentry, const char *name) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2806 | { |
Serge E. Hallyn | b537677 | 2007-10-16 23:31:36 -0700 | [diff] [blame] | 2807 | if (strcmp(name, XATTR_NAME_SELINUX)) |
| 2808 | return selinux_inode_setotherxattr(dentry, name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2809 | |
| 2810 | /* No one is allowed to remove a SELinux security label. |
| 2811 | You can change the label, but all data must be labeled. */ |
| 2812 | return -EACCES; |
| 2813 | } |
| 2814 | |
James Morris | d381d8a | 2005-10-30 14:59:22 -0800 | [diff] [blame] | 2815 | /* |
Stephen Smalley | abc69bb | 2008-05-21 14:16:12 -0400 | [diff] [blame] | 2816 | * Copy the inode security context value to the user. |
James Morris | d381d8a | 2005-10-30 14:59:22 -0800 | [diff] [blame] | 2817 | * |
| 2818 | * Permission check is handled by selinux_inode_getxattr hook. |
| 2819 | */ |
David P. Quigley | 4249259 | 2008-02-04 22:29:39 -0800 | [diff] [blame] | 2820 | 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] | 2821 | { |
David P. Quigley | 4249259 | 2008-02-04 22:29:39 -0800 | [diff] [blame] | 2822 | u32 size; |
| 2823 | int error; |
| 2824 | char *context = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2825 | struct inode_security_struct *isec = inode->i_security; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2826 | |
Dustin Kirkland | 8c8570f | 2005-11-03 17:15:16 +0000 | [diff] [blame] | 2827 | if (strcmp(name, XATTR_SELINUX_SUFFIX)) |
| 2828 | return -EOPNOTSUPP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2829 | |
Stephen Smalley | abc69bb | 2008-05-21 14:16:12 -0400 | [diff] [blame] | 2830 | /* |
| 2831 | * If the caller has CAP_MAC_ADMIN, then get the raw context |
| 2832 | * value even if it is not defined by current policy; otherwise, |
| 2833 | * use the in-core value under current policy. |
| 2834 | * Use the non-auditing forms of the permission checks since |
| 2835 | * getxattr may be called by unprivileged processes commonly |
| 2836 | * and lack of permission just means that we fall back to the |
| 2837 | * in-core context value, not a denial. |
| 2838 | */ |
Serge E. Hallyn | 3486740 | 2011-03-23 16:43:17 -0700 | [diff] [blame] | 2839 | error = selinux_capable(current, current_cred(), |
| 2840 | &init_user_ns, CAP_MAC_ADMIN, |
David Howells | 3699c53 | 2009-01-06 22:27:01 +0000 | [diff] [blame] | 2841 | SECURITY_CAP_NOAUDIT); |
Stephen Smalley | abc69bb | 2008-05-21 14:16:12 -0400 | [diff] [blame] | 2842 | if (!error) |
| 2843 | error = security_sid_to_context_force(isec->sid, &context, |
| 2844 | &size); |
| 2845 | else |
| 2846 | error = security_sid_to_context(isec->sid, &context, &size); |
David P. Quigley | 4249259 | 2008-02-04 22:29:39 -0800 | [diff] [blame] | 2847 | if (error) |
| 2848 | return error; |
| 2849 | error = size; |
| 2850 | if (alloc) { |
| 2851 | *buffer = context; |
| 2852 | goto out_nofree; |
| 2853 | } |
| 2854 | kfree(context); |
| 2855 | out_nofree: |
| 2856 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2857 | } |
| 2858 | |
| 2859 | static int selinux_inode_setsecurity(struct inode *inode, const char *name, |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 2860 | const void *value, size_t size, int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2861 | { |
| 2862 | struct inode_security_struct *isec = inode->i_security; |
| 2863 | u32 newsid; |
| 2864 | int rc; |
| 2865 | |
| 2866 | if (strcmp(name, XATTR_SELINUX_SUFFIX)) |
| 2867 | return -EOPNOTSUPP; |
| 2868 | |
| 2869 | if (!value || !size) |
| 2870 | return -EACCES; |
| 2871 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 2872 | rc = security_context_to_sid((void *)value, size, &newsid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2873 | if (rc) |
| 2874 | return rc; |
| 2875 | |
| 2876 | isec->sid = newsid; |
David P. Quigley | ddd29ec | 2009-09-09 14:25:37 -0400 | [diff] [blame] | 2877 | isec->initialized = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2878 | return 0; |
| 2879 | } |
| 2880 | |
| 2881 | static int selinux_inode_listsecurity(struct inode *inode, char *buffer, size_t buffer_size) |
| 2882 | { |
| 2883 | const int len = sizeof(XATTR_NAME_SELINUX); |
| 2884 | if (buffer && len <= buffer_size) |
| 2885 | memcpy(buffer, XATTR_NAME_SELINUX, len); |
| 2886 | return len; |
| 2887 | } |
| 2888 | |
Ahmed S. Darwish | 713a04ae | 2008-03-01 21:52:30 +0200 | [diff] [blame] | 2889 | static void selinux_inode_getsecid(const struct inode *inode, u32 *secid) |
| 2890 | { |
| 2891 | struct inode_security_struct *isec = inode->i_security; |
| 2892 | *secid = isec->sid; |
| 2893 | } |
| 2894 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2895 | /* file security operations */ |
| 2896 | |
Yuichi Nakamura | 788e7dd | 2007-09-14 09:27:07 +0900 | [diff] [blame] | 2897 | static int selinux_revalidate_file_permission(struct file *file, int mask) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2898 | { |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 2899 | const struct cred *cred = current_cred(); |
Josef Sipek | 3d5ff52 | 2006-12-08 02:37:38 -0800 | [diff] [blame] | 2900 | struct inode *inode = file->f_path.dentry->d_inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2901 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2902 | /* file_mask_to_av won't add FILE__WRITE if MAY_APPEND is set */ |
| 2903 | if ((file->f_flags & O_APPEND) && (mask & MAY_WRITE)) |
| 2904 | mask |= MAY_APPEND; |
| 2905 | |
Paul Moore | 389fb800 | 2009-03-27 17:10:34 -0400 | [diff] [blame] | 2906 | return file_has_perm(cred, file, |
| 2907 | file_mask_to_av(inode->i_mode, mask)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2908 | } |
| 2909 | |
Yuichi Nakamura | 788e7dd | 2007-09-14 09:27:07 +0900 | [diff] [blame] | 2910 | static int selinux_file_permission(struct file *file, int mask) |
| 2911 | { |
Stephen Smalley | 20dda18 | 2009-06-22 14:54:53 -0400 | [diff] [blame] | 2912 | struct inode *inode = file->f_path.dentry->d_inode; |
| 2913 | struct file_security_struct *fsec = file->f_security; |
| 2914 | struct inode_security_struct *isec = inode->i_security; |
| 2915 | u32 sid = current_sid(); |
| 2916 | |
Paul Moore | 389fb800 | 2009-03-27 17:10:34 -0400 | [diff] [blame] | 2917 | if (!mask) |
Yuichi Nakamura | 788e7dd | 2007-09-14 09:27:07 +0900 | [diff] [blame] | 2918 | /* No permission to check. Existence test. */ |
| 2919 | return 0; |
Yuichi Nakamura | 788e7dd | 2007-09-14 09:27:07 +0900 | [diff] [blame] | 2920 | |
Stephen Smalley | 20dda18 | 2009-06-22 14:54:53 -0400 | [diff] [blame] | 2921 | if (sid == fsec->sid && fsec->isid == isec->sid && |
| 2922 | fsec->pseqno == avc_policy_seqno()) |
| 2923 | /* No change since dentry_open check. */ |
| 2924 | return 0; |
| 2925 | |
Yuichi Nakamura | 788e7dd | 2007-09-14 09:27:07 +0900 | [diff] [blame] | 2926 | return selinux_revalidate_file_permission(file, mask); |
| 2927 | } |
| 2928 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2929 | static int selinux_file_alloc_security(struct file *file) |
| 2930 | { |
| 2931 | return file_alloc_security(file); |
| 2932 | } |
| 2933 | |
| 2934 | static void selinux_file_free_security(struct file *file) |
| 2935 | { |
| 2936 | file_free_security(file); |
| 2937 | } |
| 2938 | |
| 2939 | static int selinux_file_ioctl(struct file *file, unsigned int cmd, |
| 2940 | unsigned long arg) |
| 2941 | { |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 2942 | const struct cred *cred = current_cred(); |
Eric Paris | 0b24dcb | 2011-02-25 15:39:20 -0500 | [diff] [blame] | 2943 | int error = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2944 | |
Eric Paris | 0b24dcb | 2011-02-25 15:39:20 -0500 | [diff] [blame] | 2945 | switch (cmd) { |
| 2946 | case FIONREAD: |
| 2947 | /* fall through */ |
| 2948 | case FIBMAP: |
| 2949 | /* fall through */ |
| 2950 | case FIGETBSZ: |
| 2951 | /* fall through */ |
| 2952 | case EXT2_IOC_GETFLAGS: |
| 2953 | /* fall through */ |
| 2954 | case EXT2_IOC_GETVERSION: |
| 2955 | error = file_has_perm(cred, file, FILE__GETATTR); |
| 2956 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2957 | |
Eric Paris | 0b24dcb | 2011-02-25 15:39:20 -0500 | [diff] [blame] | 2958 | case EXT2_IOC_SETFLAGS: |
| 2959 | /* fall through */ |
| 2960 | case EXT2_IOC_SETVERSION: |
| 2961 | error = file_has_perm(cred, file, FILE__SETATTR); |
| 2962 | break; |
| 2963 | |
| 2964 | /* sys_ioctl() checks */ |
| 2965 | case FIONBIO: |
| 2966 | /* fall through */ |
| 2967 | case FIOASYNC: |
| 2968 | error = file_has_perm(cred, file, 0); |
| 2969 | break; |
| 2970 | |
| 2971 | case KDSKBENT: |
| 2972 | case KDSKBSENT: |
| 2973 | error = task_has_capability(current, cred, CAP_SYS_TTY_CONFIG, |
Serge E. Hallyn | 3486740 | 2011-03-23 16:43:17 -0700 | [diff] [blame] | 2974 | SECURITY_CAP_AUDIT); |
Eric Paris | 0b24dcb | 2011-02-25 15:39:20 -0500 | [diff] [blame] | 2975 | break; |
| 2976 | |
| 2977 | /* default case assumes that the command will go |
| 2978 | * to the file's ioctl() function. |
| 2979 | */ |
| 2980 | default: |
| 2981 | error = file_has_perm(cred, file, FILE__IOCTL); |
| 2982 | } |
| 2983 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2984 | } |
| 2985 | |
Stephen Smalley | fcaaade | 2010-04-28 15:57:57 -0400 | [diff] [blame] | 2986 | static int default_noexec; |
| 2987 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2988 | static int file_map_prot_check(struct file *file, unsigned long prot, int shared) |
| 2989 | { |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 2990 | const struct cred *cred = current_cred(); |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 2991 | int rc = 0; |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 2992 | |
Stephen Smalley | fcaaade | 2010-04-28 15:57:57 -0400 | [diff] [blame] | 2993 | if (default_noexec && |
| 2994 | (prot & PROT_EXEC) && (!file || (!shared && (prot & PROT_WRITE)))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2995 | /* |
| 2996 | * We are making executable an anonymous mapping or a |
| 2997 | * private file mapping that will also be writable. |
| 2998 | * This has an additional check. |
| 2999 | */ |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 3000 | rc = cred_has_perm(cred, cred, PROCESS__EXECMEM); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3001 | if (rc) |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 3002 | goto error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3003 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3004 | |
| 3005 | if (file) { |
| 3006 | /* read access is always possible with a mapping */ |
| 3007 | u32 av = FILE__READ; |
| 3008 | |
| 3009 | /* write access only matters if the mapping is shared */ |
| 3010 | if (shared && (prot & PROT_WRITE)) |
| 3011 | av |= FILE__WRITE; |
| 3012 | |
| 3013 | if (prot & PROT_EXEC) |
| 3014 | av |= FILE__EXECUTE; |
| 3015 | |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 3016 | return file_has_perm(cred, file, av); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3017 | } |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 3018 | |
| 3019 | error: |
| 3020 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3021 | } |
| 3022 | |
| 3023 | static int selinux_file_mmap(struct file *file, unsigned long reqprot, |
Eric Paris | ed03218 | 2007-06-28 15:55:21 -0400 | [diff] [blame] | 3024 | unsigned long prot, unsigned long flags, |
| 3025 | unsigned long addr, unsigned long addr_only) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3026 | { |
Eric Paris | ed03218 | 2007-06-28 15:55:21 -0400 | [diff] [blame] | 3027 | int rc = 0; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 3028 | u32 sid = current_sid(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3029 | |
Eric Paris | 84336d1a | 2009-07-31 12:54:05 -0400 | [diff] [blame] | 3030 | /* |
| 3031 | * notice that we are intentionally putting the SELinux check before |
| 3032 | * the secondary cap_file_mmap check. This is such a likely attempt |
| 3033 | * at bad behaviour/exploit that we always want to get the AVC, even |
| 3034 | * if DAC would have also denied the operation. |
| 3035 | */ |
Eric Paris | a2551df | 2009-07-31 12:54:11 -0400 | [diff] [blame] | 3036 | if (addr < CONFIG_LSM_MMAP_MIN_ADDR) { |
Eric Paris | ed03218 | 2007-06-28 15:55:21 -0400 | [diff] [blame] | 3037 | rc = avc_has_perm(sid, sid, SECCLASS_MEMPROTECT, |
| 3038 | MEMPROTECT__MMAP_ZERO, NULL); |
Eric Paris | 84336d1a | 2009-07-31 12:54:05 -0400 | [diff] [blame] | 3039 | if (rc) |
| 3040 | return rc; |
| 3041 | } |
| 3042 | |
| 3043 | /* do DAC check on address space usage */ |
| 3044 | rc = cap_file_mmap(file, reqprot, prot, flags, addr, addr_only); |
Eric Paris | ed03218 | 2007-06-28 15:55:21 -0400 | [diff] [blame] | 3045 | if (rc || addr_only) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3046 | return rc; |
| 3047 | |
| 3048 | if (selinux_checkreqprot) |
| 3049 | prot = reqprot; |
| 3050 | |
| 3051 | return file_map_prot_check(file, prot, |
| 3052 | (flags & MAP_TYPE) == MAP_SHARED); |
| 3053 | } |
| 3054 | |
| 3055 | static int selinux_file_mprotect(struct vm_area_struct *vma, |
| 3056 | unsigned long reqprot, |
| 3057 | unsigned long prot) |
| 3058 | { |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 3059 | const struct cred *cred = current_cred(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3060 | |
| 3061 | if (selinux_checkreqprot) |
| 3062 | prot = reqprot; |
| 3063 | |
Stephen Smalley | fcaaade | 2010-04-28 15:57:57 -0400 | [diff] [blame] | 3064 | if (default_noexec && |
| 3065 | (prot & PROT_EXEC) && !(vma->vm_flags & VM_EXEC)) { |
James Morris | d541bbe | 2009-01-29 12:19:51 +1100 | [diff] [blame] | 3066 | int rc = 0; |
Stephen Smalley | db4c964 | 2006-02-01 03:05:54 -0800 | [diff] [blame] | 3067 | if (vma->vm_start >= vma->vm_mm->start_brk && |
| 3068 | vma->vm_end <= vma->vm_mm->brk) { |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 3069 | rc = cred_has_perm(cred, cred, PROCESS__EXECHEAP); |
Stephen Smalley | db4c964 | 2006-02-01 03:05:54 -0800 | [diff] [blame] | 3070 | } else if (!vma->vm_file && |
| 3071 | vma->vm_start <= vma->vm_mm->start_stack && |
| 3072 | vma->vm_end >= vma->vm_mm->start_stack) { |
David Howells | 3b11a1d | 2008-11-14 10:39:26 +1100 | [diff] [blame] | 3073 | rc = current_has_perm(current, PROCESS__EXECSTACK); |
Stephen Smalley | db4c964 | 2006-02-01 03:05:54 -0800 | [diff] [blame] | 3074 | } else if (vma->vm_file && vma->anon_vma) { |
| 3075 | /* |
| 3076 | * We are making executable a file mapping that has |
| 3077 | * had some COW done. Since pages might have been |
| 3078 | * written, check ability to execute the possibly |
| 3079 | * modified content. This typically should only |
| 3080 | * occur for text relocations. |
| 3081 | */ |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 3082 | rc = file_has_perm(cred, vma->vm_file, FILE__EXECMOD); |
Stephen Smalley | db4c964 | 2006-02-01 03:05:54 -0800 | [diff] [blame] | 3083 | } |
Lorenzo Hernandez GarcÃa-Hierro | 6b99219 | 2005-06-25 14:54:34 -0700 | [diff] [blame] | 3084 | if (rc) |
| 3085 | return rc; |
| 3086 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3087 | |
| 3088 | return file_map_prot_check(vma->vm_file, prot, vma->vm_flags&VM_SHARED); |
| 3089 | } |
| 3090 | |
| 3091 | static int selinux_file_lock(struct file *file, unsigned int cmd) |
| 3092 | { |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 3093 | const struct cred *cred = current_cred(); |
| 3094 | |
| 3095 | return file_has_perm(cred, file, FILE__LOCK); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3096 | } |
| 3097 | |
| 3098 | static int selinux_file_fcntl(struct file *file, unsigned int cmd, |
| 3099 | unsigned long arg) |
| 3100 | { |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 3101 | const struct cred *cred = current_cred(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3102 | int err = 0; |
| 3103 | |
| 3104 | switch (cmd) { |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3105 | case F_SETFL: |
| 3106 | if (!file->f_path.dentry || !file->f_path.dentry->d_inode) { |
| 3107 | err = -EINVAL; |
| 3108 | break; |
| 3109 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3110 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3111 | if ((file->f_flags & O_APPEND) && !(arg & O_APPEND)) { |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 3112 | err = file_has_perm(cred, file, FILE__WRITE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3113 | break; |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3114 | } |
| 3115 | /* fall through */ |
| 3116 | case F_SETOWN: |
| 3117 | case F_SETSIG: |
| 3118 | case F_GETFL: |
| 3119 | case F_GETOWN: |
| 3120 | case F_GETSIG: |
| 3121 | /* Just check FD__USE permission */ |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 3122 | err = file_has_perm(cred, file, 0); |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3123 | break; |
| 3124 | case F_GETLK: |
| 3125 | case F_SETLK: |
| 3126 | case F_SETLKW: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3127 | #if BITS_PER_LONG == 32 |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3128 | case F_GETLK64: |
| 3129 | case F_SETLK64: |
| 3130 | case F_SETLKW64: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3131 | #endif |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3132 | if (!file->f_path.dentry || !file->f_path.dentry->d_inode) { |
| 3133 | err = -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3134 | break; |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3135 | } |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 3136 | err = file_has_perm(cred, file, FILE__LOCK); |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3137 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3138 | } |
| 3139 | |
| 3140 | return err; |
| 3141 | } |
| 3142 | |
| 3143 | static int selinux_file_set_fowner(struct file *file) |
| 3144 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3145 | struct file_security_struct *fsec; |
| 3146 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3147 | fsec = file->f_security; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 3148 | fsec->fown_sid = current_sid(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3149 | |
| 3150 | return 0; |
| 3151 | } |
| 3152 | |
| 3153 | static int selinux_file_send_sigiotask(struct task_struct *tsk, |
| 3154 | struct fown_struct *fown, int signum) |
| 3155 | { |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3156 | struct file *file; |
Stephen Smalley | 65c90bc | 2009-05-04 15:43:18 -0400 | [diff] [blame] | 3157 | u32 sid = task_sid(tsk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3158 | u32 perm; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3159 | struct file_security_struct *fsec; |
| 3160 | |
| 3161 | /* struct fown_struct is never outside the context of a struct file */ |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3162 | file = container_of(fown, struct file, f_owner); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3163 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3164 | fsec = file->f_security; |
| 3165 | |
| 3166 | if (!signum) |
| 3167 | perm = signal_to_av(SIGIO); /* as per send_sigio_to_task */ |
| 3168 | else |
| 3169 | perm = signal_to_av(signum); |
| 3170 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 3171 | return avc_has_perm(fsec->fown_sid, sid, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3172 | SECCLASS_PROCESS, perm, NULL); |
| 3173 | } |
| 3174 | |
| 3175 | static int selinux_file_receive(struct file *file) |
| 3176 | { |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 3177 | const struct cred *cred = current_cred(); |
| 3178 | |
| 3179 | return file_has_perm(cred, file, file_to_av(file)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3180 | } |
| 3181 | |
David Howells | 745ca24 | 2008-11-14 10:39:22 +1100 | [diff] [blame] | 3182 | static int selinux_dentry_open(struct file *file, const struct cred *cred) |
Yuichi Nakamura | 788e7dd | 2007-09-14 09:27:07 +0900 | [diff] [blame] | 3183 | { |
| 3184 | struct file_security_struct *fsec; |
| 3185 | struct inode *inode; |
| 3186 | struct inode_security_struct *isec; |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 3187 | |
Yuichi Nakamura | 788e7dd | 2007-09-14 09:27:07 +0900 | [diff] [blame] | 3188 | inode = file->f_path.dentry->d_inode; |
| 3189 | fsec = file->f_security; |
| 3190 | isec = inode->i_security; |
| 3191 | /* |
| 3192 | * Save inode label and policy sequence number |
| 3193 | * at open-time so that selinux_file_permission |
| 3194 | * can determine whether revalidation is necessary. |
| 3195 | * Task label is already saved in the file security |
| 3196 | * struct as its SID. |
| 3197 | */ |
| 3198 | fsec->isid = isec->sid; |
| 3199 | fsec->pseqno = avc_policy_seqno(); |
| 3200 | /* |
| 3201 | * Since the inode label or policy seqno may have changed |
| 3202 | * between the selinux_inode_permission check and the saving |
| 3203 | * of state above, recheck that access is still permitted. |
| 3204 | * Otherwise, access might never be revalidated against the |
| 3205 | * new inode label or new policy. |
| 3206 | * This check is not redundant - do not remove. |
| 3207 | */ |
David Howells | 88e67f3 | 2008-11-14 10:39:21 +1100 | [diff] [blame] | 3208 | return inode_has_perm(cred, inode, open_file_to_av(file), NULL); |
Yuichi Nakamura | 788e7dd | 2007-09-14 09:27:07 +0900 | [diff] [blame] | 3209 | } |
| 3210 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3211 | /* task security operations */ |
| 3212 | |
| 3213 | static int selinux_task_create(unsigned long clone_flags) |
| 3214 | { |
David Howells | 3b11a1d | 2008-11-14 10:39:26 +1100 | [diff] [blame] | 3215 | return current_has_perm(current, PROCESS__FORK); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3216 | } |
| 3217 | |
David Howells | f1752ee | 2008-11-14 10:39:17 +1100 | [diff] [blame] | 3218 | /* |
David Howells | ee18d64 | 2009-09-02 09:14:21 +0100 | [diff] [blame] | 3219 | * allocate the SELinux part of blank credentials |
| 3220 | */ |
| 3221 | static int selinux_cred_alloc_blank(struct cred *cred, gfp_t gfp) |
| 3222 | { |
| 3223 | struct task_security_struct *tsec; |
| 3224 | |
| 3225 | tsec = kzalloc(sizeof(struct task_security_struct), gfp); |
| 3226 | if (!tsec) |
| 3227 | return -ENOMEM; |
| 3228 | |
| 3229 | cred->security = tsec; |
| 3230 | return 0; |
| 3231 | } |
| 3232 | |
| 3233 | /* |
David Howells | f1752ee | 2008-11-14 10:39:17 +1100 | [diff] [blame] | 3234 | * detach and free the LSM part of a set of credentials |
| 3235 | */ |
| 3236 | static void selinux_cred_free(struct cred *cred) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3237 | { |
David Howells | f1752ee | 2008-11-14 10:39:17 +1100 | [diff] [blame] | 3238 | struct task_security_struct *tsec = cred->security; |
David Howells | e0e8173 | 2009-09-02 09:13:40 +0100 | [diff] [blame] | 3239 | |
Tetsuo Handa | 2edeaa3 | 2011-02-07 13:36:10 +0000 | [diff] [blame] | 3240 | /* |
| 3241 | * cred->security == NULL if security_cred_alloc_blank() or |
| 3242 | * security_prepare_creds() returned an error. |
| 3243 | */ |
| 3244 | BUG_ON(cred->security && (unsigned long) cred->security < PAGE_SIZE); |
David Howells | e0e8173 | 2009-09-02 09:13:40 +0100 | [diff] [blame] | 3245 | cred->security = (void *) 0x7UL; |
David Howells | f1752ee | 2008-11-14 10:39:17 +1100 | [diff] [blame] | 3246 | kfree(tsec); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3247 | } |
| 3248 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 3249 | /* |
| 3250 | * prepare a new set of credentials for modification |
| 3251 | */ |
| 3252 | static int selinux_cred_prepare(struct cred *new, const struct cred *old, |
| 3253 | gfp_t gfp) |
| 3254 | { |
| 3255 | const struct task_security_struct *old_tsec; |
| 3256 | struct task_security_struct *tsec; |
| 3257 | |
| 3258 | old_tsec = old->security; |
| 3259 | |
| 3260 | tsec = kmemdup(old_tsec, sizeof(struct task_security_struct), gfp); |
| 3261 | if (!tsec) |
| 3262 | return -ENOMEM; |
| 3263 | |
| 3264 | new->security = tsec; |
| 3265 | return 0; |
| 3266 | } |
| 3267 | |
| 3268 | /* |
David Howells | ee18d64 | 2009-09-02 09:14:21 +0100 | [diff] [blame] | 3269 | * transfer the SELinux data to a blank set of creds |
| 3270 | */ |
| 3271 | static void selinux_cred_transfer(struct cred *new, const struct cred *old) |
| 3272 | { |
| 3273 | const struct task_security_struct *old_tsec = old->security; |
| 3274 | struct task_security_struct *tsec = new->security; |
| 3275 | |
| 3276 | *tsec = *old_tsec; |
| 3277 | } |
| 3278 | |
| 3279 | /* |
David Howells | 3a3b7ce | 2008-11-14 10:39:28 +1100 | [diff] [blame] | 3280 | * set the security data for a kernel service |
| 3281 | * - all the creation contexts are set to unlabelled |
| 3282 | */ |
| 3283 | static int selinux_kernel_act_as(struct cred *new, u32 secid) |
| 3284 | { |
| 3285 | struct task_security_struct *tsec = new->security; |
| 3286 | u32 sid = current_sid(); |
| 3287 | int ret; |
| 3288 | |
| 3289 | ret = avc_has_perm(sid, secid, |
| 3290 | SECCLASS_KERNEL_SERVICE, |
| 3291 | KERNEL_SERVICE__USE_AS_OVERRIDE, |
| 3292 | NULL); |
| 3293 | if (ret == 0) { |
| 3294 | tsec->sid = secid; |
| 3295 | tsec->create_sid = 0; |
| 3296 | tsec->keycreate_sid = 0; |
| 3297 | tsec->sockcreate_sid = 0; |
| 3298 | } |
| 3299 | return ret; |
| 3300 | } |
| 3301 | |
| 3302 | /* |
| 3303 | * set the file creation context in a security record to the same as the |
| 3304 | * objective context of the specified inode |
| 3305 | */ |
| 3306 | static int selinux_kernel_create_files_as(struct cred *new, struct inode *inode) |
| 3307 | { |
| 3308 | struct inode_security_struct *isec = inode->i_security; |
| 3309 | struct task_security_struct *tsec = new->security; |
| 3310 | u32 sid = current_sid(); |
| 3311 | int ret; |
| 3312 | |
| 3313 | ret = avc_has_perm(sid, isec->sid, |
| 3314 | SECCLASS_KERNEL_SERVICE, |
| 3315 | KERNEL_SERVICE__CREATE_FILES_AS, |
| 3316 | NULL); |
| 3317 | |
| 3318 | if (ret == 0) |
| 3319 | tsec->create_sid = isec->sid; |
David Howells | ef57471 | 2010-02-26 01:56:16 +0000 | [diff] [blame] | 3320 | return ret; |
David Howells | 3a3b7ce | 2008-11-14 10:39:28 +1100 | [diff] [blame] | 3321 | } |
| 3322 | |
Eric Paris | dd8dbf2 | 2009-11-03 16:35:32 +1100 | [diff] [blame] | 3323 | static int selinux_kernel_module_request(char *kmod_name) |
Eric Paris | 25354c4 | 2009-08-13 09:45:03 -0400 | [diff] [blame] | 3324 | { |
Eric Paris | dd8dbf2 | 2009-11-03 16:35:32 +1100 | [diff] [blame] | 3325 | u32 sid; |
| 3326 | struct common_audit_data ad; |
| 3327 | |
| 3328 | sid = task_sid(current); |
| 3329 | |
| 3330 | COMMON_AUDIT_DATA_INIT(&ad, KMOD); |
| 3331 | ad.u.kmod_name = kmod_name; |
| 3332 | |
| 3333 | return avc_has_perm(sid, SECINITSID_KERNEL, SECCLASS_SYSTEM, |
| 3334 | SYSTEM__MODULE_REQUEST, &ad); |
Eric Paris | 25354c4 | 2009-08-13 09:45:03 -0400 | [diff] [blame] | 3335 | } |
| 3336 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3337 | static int selinux_task_setpgid(struct task_struct *p, pid_t pgid) |
| 3338 | { |
David Howells | 3b11a1d | 2008-11-14 10:39:26 +1100 | [diff] [blame] | 3339 | return current_has_perm(p, PROCESS__SETPGID); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3340 | } |
| 3341 | |
| 3342 | static int selinux_task_getpgid(struct task_struct *p) |
| 3343 | { |
David Howells | 3b11a1d | 2008-11-14 10:39:26 +1100 | [diff] [blame] | 3344 | return current_has_perm(p, PROCESS__GETPGID); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3345 | } |
| 3346 | |
| 3347 | static int selinux_task_getsid(struct task_struct *p) |
| 3348 | { |
David Howells | 3b11a1d | 2008-11-14 10:39:26 +1100 | [diff] [blame] | 3349 | return current_has_perm(p, PROCESS__GETSESSION); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3350 | } |
| 3351 | |
David Quigley | f9008e4 | 2006-06-30 01:55:46 -0700 | [diff] [blame] | 3352 | static void selinux_task_getsecid(struct task_struct *p, u32 *secid) |
| 3353 | { |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 3354 | *secid = task_sid(p); |
David Quigley | f9008e4 | 2006-06-30 01:55:46 -0700 | [diff] [blame] | 3355 | } |
| 3356 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3357 | static int selinux_task_setnice(struct task_struct *p, int nice) |
| 3358 | { |
| 3359 | int rc; |
| 3360 | |
Eric Paris | 200ac53 | 2009-02-12 15:01:04 -0500 | [diff] [blame] | 3361 | rc = cap_task_setnice(p, nice); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3362 | if (rc) |
| 3363 | return rc; |
| 3364 | |
David Howells | 3b11a1d | 2008-11-14 10:39:26 +1100 | [diff] [blame] | 3365 | return current_has_perm(p, PROCESS__SETSCHED); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3366 | } |
| 3367 | |
James Morris | 03e6806 | 2006-06-23 02:03:58 -0700 | [diff] [blame] | 3368 | static int selinux_task_setioprio(struct task_struct *p, int ioprio) |
| 3369 | { |
Serge E. Hallyn | b537677 | 2007-10-16 23:31:36 -0700 | [diff] [blame] | 3370 | int rc; |
| 3371 | |
Eric Paris | 200ac53 | 2009-02-12 15:01:04 -0500 | [diff] [blame] | 3372 | rc = cap_task_setioprio(p, ioprio); |
Serge E. Hallyn | b537677 | 2007-10-16 23:31:36 -0700 | [diff] [blame] | 3373 | if (rc) |
| 3374 | return rc; |
| 3375 | |
David Howells | 3b11a1d | 2008-11-14 10:39:26 +1100 | [diff] [blame] | 3376 | return current_has_perm(p, PROCESS__SETSCHED); |
James Morris | 03e6806 | 2006-06-23 02:03:58 -0700 | [diff] [blame] | 3377 | } |
| 3378 | |
David Quigley | a1836a4 | 2006-06-30 01:55:49 -0700 | [diff] [blame] | 3379 | static int selinux_task_getioprio(struct task_struct *p) |
| 3380 | { |
David Howells | 3b11a1d | 2008-11-14 10:39:26 +1100 | [diff] [blame] | 3381 | return current_has_perm(p, PROCESS__GETSCHED); |
David Quigley | a1836a4 | 2006-06-30 01:55:49 -0700 | [diff] [blame] | 3382 | } |
| 3383 | |
Jiri Slaby | 8fd00b4 | 2009-08-26 18:41:16 +0200 | [diff] [blame] | 3384 | static int selinux_task_setrlimit(struct task_struct *p, unsigned int resource, |
| 3385 | struct rlimit *new_rlim) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3386 | { |
Jiri Slaby | 8fd00b4 | 2009-08-26 18:41:16 +0200 | [diff] [blame] | 3387 | struct rlimit *old_rlim = p->signal->rlim + resource; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3388 | |
| 3389 | /* Control the ability to change the hard limit (whether |
| 3390 | lowering or raising it), so that the hard limit can |
| 3391 | later be used as a safe reset point for the soft limit |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 3392 | upon context transitions. See selinux_bprm_committing_creds. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3393 | if (old_rlim->rlim_max != new_rlim->rlim_max) |
Jiri Slaby | 8fd00b4 | 2009-08-26 18:41:16 +0200 | [diff] [blame] | 3394 | return current_has_perm(p, PROCESS__SETRLIMIT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3395 | |
| 3396 | return 0; |
| 3397 | } |
| 3398 | |
KOSAKI Motohiro | b0ae198 | 2010-10-15 04:21:18 +0900 | [diff] [blame] | 3399 | static int selinux_task_setscheduler(struct task_struct *p) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3400 | { |
Serge E. Hallyn | b537677 | 2007-10-16 23:31:36 -0700 | [diff] [blame] | 3401 | int rc; |
| 3402 | |
KOSAKI Motohiro | b0ae198 | 2010-10-15 04:21:18 +0900 | [diff] [blame] | 3403 | rc = cap_task_setscheduler(p); |
Serge E. Hallyn | b537677 | 2007-10-16 23:31:36 -0700 | [diff] [blame] | 3404 | if (rc) |
| 3405 | return rc; |
| 3406 | |
David Howells | 3b11a1d | 2008-11-14 10:39:26 +1100 | [diff] [blame] | 3407 | return current_has_perm(p, PROCESS__SETSCHED); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3408 | } |
| 3409 | |
| 3410 | static int selinux_task_getscheduler(struct task_struct *p) |
| 3411 | { |
David Howells | 3b11a1d | 2008-11-14 10:39:26 +1100 | [diff] [blame] | 3412 | return current_has_perm(p, PROCESS__GETSCHED); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3413 | } |
| 3414 | |
David Quigley | 3560154 | 2006-06-23 02:04:01 -0700 | [diff] [blame] | 3415 | static int selinux_task_movememory(struct task_struct *p) |
| 3416 | { |
David Howells | 3b11a1d | 2008-11-14 10:39:26 +1100 | [diff] [blame] | 3417 | return current_has_perm(p, PROCESS__SETSCHED); |
David Quigley | 3560154 | 2006-06-23 02:04:01 -0700 | [diff] [blame] | 3418 | } |
| 3419 | |
David Quigley | f9008e4 | 2006-06-30 01:55:46 -0700 | [diff] [blame] | 3420 | static int selinux_task_kill(struct task_struct *p, struct siginfo *info, |
| 3421 | int sig, u32 secid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3422 | { |
| 3423 | u32 perm; |
| 3424 | int rc; |
| 3425 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3426 | if (!sig) |
| 3427 | perm = PROCESS__SIGNULL; /* null signal; existence test */ |
| 3428 | else |
| 3429 | perm = signal_to_av(sig); |
David Quigley | f9008e4 | 2006-06-30 01:55:46 -0700 | [diff] [blame] | 3430 | if (secid) |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 3431 | rc = avc_has_perm(secid, task_sid(p), |
| 3432 | SECCLASS_PROCESS, perm, NULL); |
David Quigley | f9008e4 | 2006-06-30 01:55:46 -0700 | [diff] [blame] | 3433 | else |
David Howells | 3b11a1d | 2008-11-14 10:39:26 +1100 | [diff] [blame] | 3434 | rc = current_has_perm(p, perm); |
David Quigley | f9008e4 | 2006-06-30 01:55:46 -0700 | [diff] [blame] | 3435 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3436 | } |
| 3437 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3438 | static int selinux_task_wait(struct task_struct *p) |
| 3439 | { |
Eric Paris | 8a53514 | 2007-10-22 16:10:31 -0400 | [diff] [blame] | 3440 | return task_has_perm(p, current, PROCESS__SIGCHLD); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3441 | } |
| 3442 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3443 | static void selinux_task_to_inode(struct task_struct *p, |
| 3444 | struct inode *inode) |
| 3445 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3446 | struct inode_security_struct *isec = inode->i_security; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 3447 | u32 sid = task_sid(p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3448 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 3449 | isec->sid = sid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3450 | isec->initialized = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3451 | } |
| 3452 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3453 | /* Returns error only if unable to parse addresses */ |
Venkat Yekkirala | 67f83cb | 2006-11-08 17:04:26 -0600 | [diff] [blame] | 3454 | static int selinux_parse_skb_ipv4(struct sk_buff *skb, |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 3455 | struct common_audit_data *ad, u8 *proto) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3456 | { |
| 3457 | int offset, ihlen, ret = -EINVAL; |
| 3458 | struct iphdr _iph, *ih; |
| 3459 | |
Arnaldo Carvalho de Melo | bbe735e | 2007-03-10 22:16:10 -0300 | [diff] [blame] | 3460 | offset = skb_network_offset(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3461 | ih = skb_header_pointer(skb, offset, sizeof(_iph), &_iph); |
| 3462 | if (ih == NULL) |
| 3463 | goto out; |
| 3464 | |
| 3465 | ihlen = ih->ihl * 4; |
| 3466 | if (ihlen < sizeof(_iph)) |
| 3467 | goto out; |
| 3468 | |
| 3469 | ad->u.net.v4info.saddr = ih->saddr; |
| 3470 | ad->u.net.v4info.daddr = ih->daddr; |
| 3471 | ret = 0; |
| 3472 | |
Venkat Yekkirala | 67f83cb | 2006-11-08 17:04:26 -0600 | [diff] [blame] | 3473 | if (proto) |
| 3474 | *proto = ih->protocol; |
| 3475 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3476 | switch (ih->protocol) { |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3477 | case IPPROTO_TCP: { |
| 3478 | struct tcphdr _tcph, *th; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3479 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3480 | if (ntohs(ih->frag_off) & IP_OFFSET) |
| 3481 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3482 | |
| 3483 | offset += ihlen; |
| 3484 | th = skb_header_pointer(skb, offset, sizeof(_tcph), &_tcph); |
| 3485 | if (th == NULL) |
| 3486 | break; |
| 3487 | |
| 3488 | ad->u.net.sport = th->source; |
| 3489 | ad->u.net.dport = th->dest; |
| 3490 | break; |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3491 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3492 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3493 | case IPPROTO_UDP: { |
| 3494 | struct udphdr _udph, *uh; |
| 3495 | |
| 3496 | if (ntohs(ih->frag_off) & IP_OFFSET) |
| 3497 | break; |
| 3498 | |
| 3499 | offset += ihlen; |
| 3500 | uh = skb_header_pointer(skb, offset, sizeof(_udph), &_udph); |
| 3501 | if (uh == NULL) |
| 3502 | break; |
| 3503 | |
| 3504 | ad->u.net.sport = uh->source; |
| 3505 | ad->u.net.dport = uh->dest; |
| 3506 | break; |
| 3507 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3508 | |
James Morris | 2ee92d4 | 2006-11-13 16:09:01 -0800 | [diff] [blame] | 3509 | case IPPROTO_DCCP: { |
| 3510 | struct dccp_hdr _dccph, *dh; |
| 3511 | |
| 3512 | if (ntohs(ih->frag_off) & IP_OFFSET) |
| 3513 | break; |
| 3514 | |
| 3515 | offset += ihlen; |
| 3516 | dh = skb_header_pointer(skb, offset, sizeof(_dccph), &_dccph); |
| 3517 | if (dh == NULL) |
| 3518 | break; |
| 3519 | |
| 3520 | ad->u.net.sport = dh->dccph_sport; |
| 3521 | ad->u.net.dport = dh->dccph_dport; |
| 3522 | break; |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3523 | } |
James Morris | 2ee92d4 | 2006-11-13 16:09:01 -0800 | [diff] [blame] | 3524 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3525 | default: |
| 3526 | break; |
| 3527 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3528 | out: |
| 3529 | return ret; |
| 3530 | } |
| 3531 | |
| 3532 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
| 3533 | |
| 3534 | /* Returns error only if unable to parse addresses */ |
Venkat Yekkirala | 67f83cb | 2006-11-08 17:04:26 -0600 | [diff] [blame] | 3535 | static int selinux_parse_skb_ipv6(struct sk_buff *skb, |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 3536 | struct common_audit_data *ad, u8 *proto) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3537 | { |
| 3538 | u8 nexthdr; |
| 3539 | int ret = -EINVAL, offset; |
| 3540 | struct ipv6hdr _ipv6h, *ip6; |
| 3541 | |
Arnaldo Carvalho de Melo | bbe735e | 2007-03-10 22:16:10 -0300 | [diff] [blame] | 3542 | offset = skb_network_offset(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3543 | ip6 = skb_header_pointer(skb, offset, sizeof(_ipv6h), &_ipv6h); |
| 3544 | if (ip6 == NULL) |
| 3545 | goto out; |
| 3546 | |
| 3547 | ipv6_addr_copy(&ad->u.net.v6info.saddr, &ip6->saddr); |
| 3548 | ipv6_addr_copy(&ad->u.net.v6info.daddr, &ip6->daddr); |
| 3549 | ret = 0; |
| 3550 | |
| 3551 | nexthdr = ip6->nexthdr; |
| 3552 | offset += sizeof(_ipv6h); |
Herbert Xu | 0d3d077 | 2005-04-24 20:16:19 -0700 | [diff] [blame] | 3553 | offset = ipv6_skip_exthdr(skb, offset, &nexthdr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3554 | if (offset < 0) |
| 3555 | goto out; |
| 3556 | |
Venkat Yekkirala | 67f83cb | 2006-11-08 17:04:26 -0600 | [diff] [blame] | 3557 | if (proto) |
| 3558 | *proto = nexthdr; |
| 3559 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3560 | switch (nexthdr) { |
| 3561 | case IPPROTO_TCP: { |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3562 | struct tcphdr _tcph, *th; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3563 | |
| 3564 | th = skb_header_pointer(skb, offset, sizeof(_tcph), &_tcph); |
| 3565 | if (th == NULL) |
| 3566 | break; |
| 3567 | |
| 3568 | ad->u.net.sport = th->source; |
| 3569 | ad->u.net.dport = th->dest; |
| 3570 | break; |
| 3571 | } |
| 3572 | |
| 3573 | case IPPROTO_UDP: { |
| 3574 | struct udphdr _udph, *uh; |
| 3575 | |
| 3576 | uh = skb_header_pointer(skb, offset, sizeof(_udph), &_udph); |
| 3577 | if (uh == NULL) |
| 3578 | break; |
| 3579 | |
| 3580 | ad->u.net.sport = uh->source; |
| 3581 | ad->u.net.dport = uh->dest; |
| 3582 | break; |
| 3583 | } |
| 3584 | |
James Morris | 2ee92d4 | 2006-11-13 16:09:01 -0800 | [diff] [blame] | 3585 | case IPPROTO_DCCP: { |
| 3586 | struct dccp_hdr _dccph, *dh; |
| 3587 | |
| 3588 | dh = skb_header_pointer(skb, offset, sizeof(_dccph), &_dccph); |
| 3589 | if (dh == NULL) |
| 3590 | break; |
| 3591 | |
| 3592 | ad->u.net.sport = dh->dccph_sport; |
| 3593 | ad->u.net.dport = dh->dccph_dport; |
| 3594 | break; |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3595 | } |
James Morris | 2ee92d4 | 2006-11-13 16:09:01 -0800 | [diff] [blame] | 3596 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3597 | /* includes fragments */ |
| 3598 | default: |
| 3599 | break; |
| 3600 | } |
| 3601 | out: |
| 3602 | return ret; |
| 3603 | } |
| 3604 | |
| 3605 | #endif /* IPV6 */ |
| 3606 | |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 3607 | 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] | 3608 | char **_addrp, int src, u8 *proto) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3609 | { |
David Howells | cf9481e | 2008-07-27 21:31:07 +1000 | [diff] [blame] | 3610 | char *addrp; |
| 3611 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3612 | |
| 3613 | switch (ad->u.net.family) { |
| 3614 | case PF_INET: |
Venkat Yekkirala | 67f83cb | 2006-11-08 17:04:26 -0600 | [diff] [blame] | 3615 | ret = selinux_parse_skb_ipv4(skb, ad, proto); |
David Howells | cf9481e | 2008-07-27 21:31:07 +1000 | [diff] [blame] | 3616 | if (ret) |
| 3617 | goto parse_error; |
| 3618 | addrp = (char *)(src ? &ad->u.net.v4info.saddr : |
| 3619 | &ad->u.net.v4info.daddr); |
| 3620 | goto okay; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3621 | |
| 3622 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
| 3623 | case PF_INET6: |
Venkat Yekkirala | 67f83cb | 2006-11-08 17:04:26 -0600 | [diff] [blame] | 3624 | ret = selinux_parse_skb_ipv6(skb, ad, proto); |
David Howells | cf9481e | 2008-07-27 21:31:07 +1000 | [diff] [blame] | 3625 | if (ret) |
| 3626 | goto parse_error; |
| 3627 | addrp = (char *)(src ? &ad->u.net.v6info.saddr : |
| 3628 | &ad->u.net.v6info.daddr); |
| 3629 | goto okay; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3630 | #endif /* IPV6 */ |
| 3631 | default: |
David Howells | cf9481e | 2008-07-27 21:31:07 +1000 | [diff] [blame] | 3632 | addrp = NULL; |
| 3633 | goto okay; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3634 | } |
| 3635 | |
David Howells | cf9481e | 2008-07-27 21:31:07 +1000 | [diff] [blame] | 3636 | parse_error: |
| 3637 | printk(KERN_WARNING |
| 3638 | "SELinux: failure in selinux_parse_skb()," |
| 3639 | " unable to parse packet\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3640 | return ret; |
David Howells | cf9481e | 2008-07-27 21:31:07 +1000 | [diff] [blame] | 3641 | |
| 3642 | okay: |
| 3643 | if (_addrp) |
| 3644 | *_addrp = addrp; |
| 3645 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3646 | } |
| 3647 | |
Paul Moore | 4f6a993 | 2007-03-01 14:35:22 -0500 | [diff] [blame] | 3648 | /** |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 3649 | * selinux_skb_peerlbl_sid - Determine the peer label of a packet |
Paul Moore | 4f6a993 | 2007-03-01 14:35:22 -0500 | [diff] [blame] | 3650 | * @skb: the packet |
Paul Moore | 75e2291 | 2008-01-29 08:38:04 -0500 | [diff] [blame] | 3651 | * @family: protocol family |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 3652 | * @sid: the packet's peer label SID |
Paul Moore | 4f6a993 | 2007-03-01 14:35:22 -0500 | [diff] [blame] | 3653 | * |
| 3654 | * Description: |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 3655 | * Check the various different forms of network peer labeling and determine |
| 3656 | * the peer label/SID for the packet; most of the magic actually occurs in |
| 3657 | * the security server function security_net_peersid_cmp(). The function |
| 3658 | * returns zero if the value in @sid is valid (although it may be SECSID_NULL) |
| 3659 | * or -EACCES if @sid is invalid due to inconsistencies with the different |
| 3660 | * peer labels. |
Paul Moore | 4f6a993 | 2007-03-01 14:35:22 -0500 | [diff] [blame] | 3661 | * |
| 3662 | */ |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 3663 | 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] | 3664 | { |
Paul Moore | 71f1cb0 | 2008-01-29 08:51:16 -0500 | [diff] [blame] | 3665 | int err; |
Paul Moore | 4f6a993 | 2007-03-01 14:35:22 -0500 | [diff] [blame] | 3666 | u32 xfrm_sid; |
| 3667 | u32 nlbl_sid; |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 3668 | u32 nlbl_type; |
Paul Moore | 4f6a993 | 2007-03-01 14:35:22 -0500 | [diff] [blame] | 3669 | |
| 3670 | selinux_skb_xfrm_sid(skb, &xfrm_sid); |
Paul Moore | 5dbe1eb | 2008-01-29 08:44:18 -0500 | [diff] [blame] | 3671 | selinux_netlbl_skbuff_getsid(skb, family, &nlbl_type, &nlbl_sid); |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 3672 | |
Paul Moore | 71f1cb0 | 2008-01-29 08:51:16 -0500 | [diff] [blame] | 3673 | err = security_net_peersid_resolve(nlbl_sid, nlbl_type, xfrm_sid, sid); |
| 3674 | if (unlikely(err)) { |
| 3675 | printk(KERN_WARNING |
| 3676 | "SELinux: failure in selinux_skb_peerlbl_sid()," |
| 3677 | " unable to determine packet's peer label\n"); |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 3678 | return -EACCES; |
Paul Moore | 71f1cb0 | 2008-01-29 08:51:16 -0500 | [diff] [blame] | 3679 | } |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 3680 | |
| 3681 | return 0; |
Paul Moore | 4f6a993 | 2007-03-01 14:35:22 -0500 | [diff] [blame] | 3682 | } |
| 3683 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3684 | /* socket security operations */ |
Paul Moore | d4f2d97 | 2010-04-22 14:46:18 -0400 | [diff] [blame] | 3685 | |
Harry Ciao | 2ad18bd | 2011-03-02 13:32:34 +0800 | [diff] [blame] | 3686 | static int socket_sockcreate_sid(const struct task_security_struct *tsec, |
| 3687 | u16 secclass, u32 *socksid) |
Paul Moore | d4f2d97 | 2010-04-22 14:46:18 -0400 | [diff] [blame] | 3688 | { |
Harry Ciao | 2ad18bd | 2011-03-02 13:32:34 +0800 | [diff] [blame] | 3689 | if (tsec->sockcreate_sid > SECSID_NULL) { |
| 3690 | *socksid = tsec->sockcreate_sid; |
| 3691 | return 0; |
| 3692 | } |
| 3693 | |
| 3694 | return security_transition_sid(tsec->sid, tsec->sid, secclass, NULL, |
| 3695 | socksid); |
Paul Moore | d4f2d97 | 2010-04-22 14:46:18 -0400 | [diff] [blame] | 3696 | } |
| 3697 | |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 3698 | 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] | 3699 | { |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 3700 | struct sk_security_struct *sksec = sk->sk_security; |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 3701 | struct common_audit_data ad; |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 3702 | u32 tsid = task_sid(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3703 | |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 3704 | if (sksec->sid == SECINITSID_KERNEL) |
| 3705 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3706 | |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 3707 | COMMON_AUDIT_DATA_INIT(&ad, NET); |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 3708 | ad.u.net.sk = sk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3709 | |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 3710 | return avc_has_perm(tsid, sksec->sid, sksec->sclass, perms, &ad); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3711 | } |
| 3712 | |
| 3713 | static int selinux_socket_create(int family, int type, |
| 3714 | int protocol, int kern) |
| 3715 | { |
Paul Moore | 5fb4987 | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 3716 | const struct task_security_struct *tsec = current_security(); |
Paul Moore | d4f2d97 | 2010-04-22 14:46:18 -0400 | [diff] [blame] | 3717 | u32 newsid; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 3718 | u16 secclass; |
Harry Ciao | 2ad18bd | 2011-03-02 13:32:34 +0800 | [diff] [blame] | 3719 | int rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3720 | |
| 3721 | if (kern) |
Paul Moore | d4f2d97 | 2010-04-22 14:46:18 -0400 | [diff] [blame] | 3722 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3723 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 3724 | secclass = socket_type_to_security_class(family, type, protocol); |
Harry Ciao | 2ad18bd | 2011-03-02 13:32:34 +0800 | [diff] [blame] | 3725 | rc = socket_sockcreate_sid(tsec, secclass, &newsid); |
| 3726 | if (rc) |
| 3727 | return rc; |
| 3728 | |
Paul Moore | d4f2d97 | 2010-04-22 14:46:18 -0400 | [diff] [blame] | 3729 | return avc_has_perm(tsec->sid, newsid, secclass, SOCKET__CREATE, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3730 | } |
| 3731 | |
Venkat Yekkirala | 7420ed2 | 2006-08-04 23:17:57 -0700 | [diff] [blame] | 3732 | static int selinux_socket_post_create(struct socket *sock, int family, |
| 3733 | int type, int protocol, int kern) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3734 | { |
Paul Moore | 5fb4987 | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 3735 | const struct task_security_struct *tsec = current_security(); |
Paul Moore | d4f2d97 | 2010-04-22 14:46:18 -0400 | [diff] [blame] | 3736 | struct inode_security_struct *isec = SOCK_INODE(sock)->i_security; |
Venkat Yekkirala | 892c141 | 2006-08-04 23:08:56 -0700 | [diff] [blame] | 3737 | struct sk_security_struct *sksec; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 3738 | int err = 0; |
| 3739 | |
Harry Ciao | 2ad18bd | 2011-03-02 13:32:34 +0800 | [diff] [blame] | 3740 | isec->sclass = socket_type_to_security_class(family, type, protocol); |
| 3741 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 3742 | if (kern) |
| 3743 | isec->sid = SECINITSID_KERNEL; |
Harry Ciao | 2ad18bd | 2011-03-02 13:32:34 +0800 | [diff] [blame] | 3744 | else { |
| 3745 | err = socket_sockcreate_sid(tsec, isec->sclass, &(isec->sid)); |
| 3746 | if (err) |
| 3747 | return err; |
| 3748 | } |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 3749 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3750 | isec->initialized = 1; |
| 3751 | |
Venkat Yekkirala | 892c141 | 2006-08-04 23:08:56 -0700 | [diff] [blame] | 3752 | if (sock->sk) { |
| 3753 | sksec = sock->sk->sk_security; |
| 3754 | sksec->sid = isec->sid; |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 3755 | sksec->sclass = isec->sclass; |
Paul Moore | 389fb800 | 2009-03-27 17:10:34 -0400 | [diff] [blame] | 3756 | err = selinux_netlbl_socket_post_create(sock->sk, family); |
Venkat Yekkirala | 892c141 | 2006-08-04 23:08:56 -0700 | [diff] [blame] | 3757 | } |
| 3758 | |
Venkat Yekkirala | 7420ed2 | 2006-08-04 23:17:57 -0700 | [diff] [blame] | 3759 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3760 | } |
| 3761 | |
| 3762 | /* Range of port numbers used to automatically bind. |
| 3763 | Need to determine whether we should perform a name_bind |
| 3764 | permission check between the socket and the port number. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3765 | |
| 3766 | static int selinux_socket_bind(struct socket *sock, struct sockaddr *address, int addrlen) |
| 3767 | { |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 3768 | struct sock *sk = sock->sk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3769 | u16 family; |
| 3770 | int err; |
| 3771 | |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 3772 | err = sock_has_perm(current, sk, SOCKET__BIND); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3773 | if (err) |
| 3774 | goto out; |
| 3775 | |
| 3776 | /* |
| 3777 | * 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] | 3778 | * Multiple address binding for SCTP is not supported yet: we just |
| 3779 | * check the first address now. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3780 | */ |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 3781 | family = sk->sk_family; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3782 | if (family == PF_INET || family == PF_INET6) { |
| 3783 | char *addrp; |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 3784 | struct sk_security_struct *sksec = sk->sk_security; |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 3785 | struct common_audit_data ad; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3786 | struct sockaddr_in *addr4 = NULL; |
| 3787 | struct sockaddr_in6 *addr6 = NULL; |
| 3788 | unsigned short snum; |
James Morris | e399f98 | 2008-06-12 01:39:58 +1000 | [diff] [blame] | 3789 | u32 sid, node_perm; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3790 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3791 | if (family == PF_INET) { |
| 3792 | addr4 = (struct sockaddr_in *)address; |
| 3793 | snum = ntohs(addr4->sin_port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3794 | addrp = (char *)&addr4->sin_addr.s_addr; |
| 3795 | } else { |
| 3796 | addr6 = (struct sockaddr_in6 *)address; |
| 3797 | snum = ntohs(addr6->sin6_port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3798 | addrp = (char *)&addr6->sin6_addr.s6_addr; |
| 3799 | } |
| 3800 | |
Stephen Hemminger | 227b60f | 2007-10-10 17:30:46 -0700 | [diff] [blame] | 3801 | if (snum) { |
| 3802 | int low, high; |
| 3803 | |
| 3804 | inet_get_local_port_range(&low, &high); |
| 3805 | |
| 3806 | if (snum < max(PROT_SOCK, low) || snum > high) { |
Paul Moore | 3e11217 | 2008-04-10 10:48:14 -0400 | [diff] [blame] | 3807 | err = sel_netport_sid(sk->sk_protocol, |
| 3808 | snum, &sid); |
Stephen Hemminger | 227b60f | 2007-10-10 17:30:46 -0700 | [diff] [blame] | 3809 | if (err) |
| 3810 | goto out; |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 3811 | COMMON_AUDIT_DATA_INIT(&ad, NET); |
Stephen Hemminger | 227b60f | 2007-10-10 17:30:46 -0700 | [diff] [blame] | 3812 | ad.u.net.sport = htons(snum); |
| 3813 | ad.u.net.family = family; |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 3814 | err = avc_has_perm(sksec->sid, sid, |
| 3815 | sksec->sclass, |
Stephen Hemminger | 227b60f | 2007-10-10 17:30:46 -0700 | [diff] [blame] | 3816 | SOCKET__NAME_BIND, &ad); |
| 3817 | if (err) |
| 3818 | goto out; |
| 3819 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3820 | } |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3821 | |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 3822 | switch (sksec->sclass) { |
James Morris | 1340258 | 2005-09-30 14:24:34 -0400 | [diff] [blame] | 3823 | case SECCLASS_TCP_SOCKET: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3824 | node_perm = TCP_SOCKET__NODE_BIND; |
| 3825 | break; |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3826 | |
James Morris | 1340258 | 2005-09-30 14:24:34 -0400 | [diff] [blame] | 3827 | case SECCLASS_UDP_SOCKET: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3828 | node_perm = UDP_SOCKET__NODE_BIND; |
| 3829 | break; |
James Morris | 2ee92d4 | 2006-11-13 16:09:01 -0800 | [diff] [blame] | 3830 | |
| 3831 | case SECCLASS_DCCP_SOCKET: |
| 3832 | node_perm = DCCP_SOCKET__NODE_BIND; |
| 3833 | break; |
| 3834 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3835 | default: |
| 3836 | node_perm = RAWIP_SOCKET__NODE_BIND; |
| 3837 | break; |
| 3838 | } |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3839 | |
Paul Moore | 224dfbd | 2008-01-29 08:38:13 -0500 | [diff] [blame] | 3840 | err = sel_netnode_sid(addrp, family, &sid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3841 | if (err) |
| 3842 | goto out; |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3843 | |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 3844 | COMMON_AUDIT_DATA_INIT(&ad, NET); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3845 | ad.u.net.sport = htons(snum); |
| 3846 | ad.u.net.family = family; |
| 3847 | |
| 3848 | if (family == PF_INET) |
| 3849 | ad.u.net.v4info.saddr = addr4->sin_addr.s_addr; |
| 3850 | else |
| 3851 | ipv6_addr_copy(&ad.u.net.v6info.saddr, &addr6->sin6_addr); |
| 3852 | |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 3853 | err = avc_has_perm(sksec->sid, sid, |
| 3854 | sksec->sclass, node_perm, &ad); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3855 | if (err) |
| 3856 | goto out; |
| 3857 | } |
| 3858 | out: |
| 3859 | return err; |
| 3860 | } |
| 3861 | |
| 3862 | static int selinux_socket_connect(struct socket *sock, struct sockaddr *address, int addrlen) |
| 3863 | { |
Paul Moore | 014ab19 | 2008-10-10 10:16:33 -0400 | [diff] [blame] | 3864 | struct sock *sk = sock->sk; |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 3865 | struct sk_security_struct *sksec = sk->sk_security; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3866 | int err; |
| 3867 | |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 3868 | err = sock_has_perm(current, sk, SOCKET__CONNECT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3869 | if (err) |
| 3870 | return err; |
| 3871 | |
| 3872 | /* |
James Morris | 2ee92d4 | 2006-11-13 16:09:01 -0800 | [diff] [blame] | 3873 | * 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] | 3874 | */ |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 3875 | if (sksec->sclass == SECCLASS_TCP_SOCKET || |
| 3876 | sksec->sclass == SECCLASS_DCCP_SOCKET) { |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 3877 | struct common_audit_data ad; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3878 | struct sockaddr_in *addr4 = NULL; |
| 3879 | struct sockaddr_in6 *addr6 = NULL; |
| 3880 | unsigned short snum; |
James Morris | 2ee92d4 | 2006-11-13 16:09:01 -0800 | [diff] [blame] | 3881 | u32 sid, perm; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3882 | |
| 3883 | if (sk->sk_family == PF_INET) { |
| 3884 | addr4 = (struct sockaddr_in *)address; |
Stephen Smalley | 911656f | 2005-07-28 21:16:21 -0700 | [diff] [blame] | 3885 | if (addrlen < sizeof(struct sockaddr_in)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3886 | return -EINVAL; |
| 3887 | snum = ntohs(addr4->sin_port); |
| 3888 | } else { |
| 3889 | addr6 = (struct sockaddr_in6 *)address; |
Stephen Smalley | 911656f | 2005-07-28 21:16:21 -0700 | [diff] [blame] | 3890 | if (addrlen < SIN6_LEN_RFC2133) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3891 | return -EINVAL; |
| 3892 | snum = ntohs(addr6->sin6_port); |
| 3893 | } |
| 3894 | |
Paul Moore | 3e11217 | 2008-04-10 10:48:14 -0400 | [diff] [blame] | 3895 | err = sel_netport_sid(sk->sk_protocol, snum, &sid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3896 | if (err) |
| 3897 | goto out; |
| 3898 | |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 3899 | perm = (sksec->sclass == SECCLASS_TCP_SOCKET) ? |
James Morris | 2ee92d4 | 2006-11-13 16:09:01 -0800 | [diff] [blame] | 3900 | TCP_SOCKET__NAME_CONNECT : DCCP_SOCKET__NAME_CONNECT; |
| 3901 | |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 3902 | COMMON_AUDIT_DATA_INIT(&ad, NET); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3903 | ad.u.net.dport = htons(snum); |
| 3904 | ad.u.net.family = sk->sk_family; |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 3905 | err = avc_has_perm(sksec->sid, sid, sksec->sclass, perm, &ad); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3906 | if (err) |
| 3907 | goto out; |
| 3908 | } |
| 3909 | |
Paul Moore | 014ab19 | 2008-10-10 10:16:33 -0400 | [diff] [blame] | 3910 | err = selinux_netlbl_socket_connect(sk, address); |
| 3911 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3912 | out: |
| 3913 | return err; |
| 3914 | } |
| 3915 | |
| 3916 | static int selinux_socket_listen(struct socket *sock, int backlog) |
| 3917 | { |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 3918 | return sock_has_perm(current, sock->sk, SOCKET__LISTEN); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3919 | } |
| 3920 | |
| 3921 | static int selinux_socket_accept(struct socket *sock, struct socket *newsock) |
| 3922 | { |
| 3923 | int err; |
| 3924 | struct inode_security_struct *isec; |
| 3925 | struct inode_security_struct *newisec; |
| 3926 | |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 3927 | err = sock_has_perm(current, sock->sk, SOCKET__ACCEPT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3928 | if (err) |
| 3929 | return err; |
| 3930 | |
| 3931 | newisec = SOCK_INODE(newsock)->i_security; |
| 3932 | |
| 3933 | isec = SOCK_INODE(sock)->i_security; |
| 3934 | newisec->sclass = isec->sclass; |
| 3935 | newisec->sid = isec->sid; |
| 3936 | newisec->initialized = 1; |
| 3937 | |
| 3938 | return 0; |
| 3939 | } |
| 3940 | |
| 3941 | static int selinux_socket_sendmsg(struct socket *sock, struct msghdr *msg, |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3942 | int size) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3943 | { |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 3944 | return sock_has_perm(current, sock->sk, SOCKET__WRITE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3945 | } |
| 3946 | |
| 3947 | static int selinux_socket_recvmsg(struct socket *sock, struct msghdr *msg, |
| 3948 | int size, int flags) |
| 3949 | { |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 3950 | return sock_has_perm(current, sock->sk, SOCKET__READ); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3951 | } |
| 3952 | |
| 3953 | static int selinux_socket_getsockname(struct socket *sock) |
| 3954 | { |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 3955 | return sock_has_perm(current, sock->sk, SOCKET__GETATTR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3956 | } |
| 3957 | |
| 3958 | static int selinux_socket_getpeername(struct socket *sock) |
| 3959 | { |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 3960 | return sock_has_perm(current, sock->sk, SOCKET__GETATTR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3961 | } |
| 3962 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 3963 | static int selinux_socket_setsockopt(struct socket *sock, int level, int optname) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3964 | { |
Paul Moore | f8687af | 2006-10-30 15:22:15 -0800 | [diff] [blame] | 3965 | int err; |
| 3966 | |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 3967 | err = sock_has_perm(current, sock->sk, SOCKET__SETOPT); |
Paul Moore | f8687af | 2006-10-30 15:22:15 -0800 | [diff] [blame] | 3968 | if (err) |
| 3969 | return err; |
| 3970 | |
| 3971 | return selinux_netlbl_socket_setsockopt(sock, level, optname); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3972 | } |
| 3973 | |
| 3974 | static int selinux_socket_getsockopt(struct socket *sock, int level, |
| 3975 | int optname) |
| 3976 | { |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 3977 | return sock_has_perm(current, sock->sk, SOCKET__GETOPT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3978 | } |
| 3979 | |
| 3980 | static int selinux_socket_shutdown(struct socket *sock, int how) |
| 3981 | { |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 3982 | return sock_has_perm(current, sock->sk, SOCKET__SHUTDOWN); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3983 | } |
| 3984 | |
David S. Miller | 3610cda | 2011-01-05 15:38:53 -0800 | [diff] [blame] | 3985 | static int selinux_socket_unix_stream_connect(struct sock *sock, |
| 3986 | struct sock *other, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3987 | struct sock *newsk) |
| 3988 | { |
David S. Miller | 3610cda | 2011-01-05 15:38:53 -0800 | [diff] [blame] | 3989 | struct sk_security_struct *sksec_sock = sock->sk_security; |
| 3990 | struct sk_security_struct *sksec_other = other->sk_security; |
Paul Moore | 4d1e245 | 2010-04-22 14:46:18 -0400 | [diff] [blame] | 3991 | struct sk_security_struct *sksec_new = newsk->sk_security; |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 3992 | struct common_audit_data ad; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3993 | int err; |
| 3994 | |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 3995 | COMMON_AUDIT_DATA_INIT(&ad, NET); |
David S. Miller | 3610cda | 2011-01-05 15:38:53 -0800 | [diff] [blame] | 3996 | ad.u.net.sk = other; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3997 | |
Paul Moore | 4d1e245 | 2010-04-22 14:46:18 -0400 | [diff] [blame] | 3998 | err = avc_has_perm(sksec_sock->sid, sksec_other->sid, |
| 3999 | sksec_other->sclass, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4000 | UNIX_STREAM_SOCKET__CONNECTTO, &ad); |
| 4001 | if (err) |
| 4002 | return err; |
| 4003 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4004 | /* server child socket */ |
Paul Moore | 4d1e245 | 2010-04-22 14:46:18 -0400 | [diff] [blame] | 4005 | sksec_new->peer_sid = sksec_sock->sid; |
| 4006 | err = security_sid_mls_copy(sksec_other->sid, sksec_sock->sid, |
| 4007 | &sksec_new->sid); |
| 4008 | if (err) |
| 4009 | return err; |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 4010 | |
Paul Moore | 4d1e245 | 2010-04-22 14:46:18 -0400 | [diff] [blame] | 4011 | /* connecting socket */ |
| 4012 | sksec_sock->peer_sid = sksec_new->sid; |
| 4013 | |
| 4014 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4015 | } |
| 4016 | |
| 4017 | static int selinux_socket_unix_may_send(struct socket *sock, |
| 4018 | struct socket *other) |
| 4019 | { |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 4020 | struct sk_security_struct *ssec = sock->sk->sk_security; |
| 4021 | struct sk_security_struct *osec = other->sk->sk_security; |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 4022 | struct common_audit_data ad; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4023 | |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 4024 | COMMON_AUDIT_DATA_INIT(&ad, NET); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4025 | ad.u.net.sk = other->sk; |
| 4026 | |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 4027 | return avc_has_perm(ssec->sid, osec->sid, osec->sclass, SOCKET__SENDTO, |
| 4028 | &ad); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4029 | } |
| 4030 | |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4031 | static int selinux_inet_sys_rcv_skb(int ifindex, char *addrp, u16 family, |
| 4032 | u32 peer_sid, |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 4033 | struct common_audit_data *ad) |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4034 | { |
| 4035 | int err; |
| 4036 | u32 if_sid; |
| 4037 | u32 node_sid; |
| 4038 | |
| 4039 | err = sel_netif_sid(ifindex, &if_sid); |
| 4040 | if (err) |
| 4041 | return err; |
| 4042 | err = avc_has_perm(peer_sid, if_sid, |
| 4043 | SECCLASS_NETIF, NETIF__INGRESS, ad); |
| 4044 | if (err) |
| 4045 | return err; |
| 4046 | |
| 4047 | err = sel_netnode_sid(addrp, family, &node_sid); |
| 4048 | if (err) |
| 4049 | return err; |
| 4050 | return avc_has_perm(peer_sid, node_sid, |
| 4051 | SECCLASS_NODE, NODE__RECVFROM, ad); |
| 4052 | } |
| 4053 | |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4054 | 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] | 4055 | u16 family) |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4056 | { |
Paul Moore | 277d342 | 2008-12-31 12:54:11 -0500 | [diff] [blame] | 4057 | int err = 0; |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4058 | struct sk_security_struct *sksec = sk->sk_security; |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4059 | u32 sk_sid = sksec->sid; |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 4060 | struct common_audit_data ad; |
Paul Moore | d8395c8 | 2008-10-10 10:16:30 -0400 | [diff] [blame] | 4061 | char *addrp; |
| 4062 | |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 4063 | COMMON_AUDIT_DATA_INIT(&ad, NET); |
Eric Dumazet | 8964be4 | 2009-11-20 15:35:04 -0800 | [diff] [blame] | 4064 | ad.u.net.netif = skb->skb_iif; |
Paul Moore | d8395c8 | 2008-10-10 10:16:30 -0400 | [diff] [blame] | 4065 | ad.u.net.family = family; |
| 4066 | err = selinux_parse_skb(skb, &ad, &addrp, 1, NULL); |
| 4067 | if (err) |
| 4068 | return err; |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4069 | |
Paul Moore | 58bfbb5 | 2009-03-27 17:10:41 -0400 | [diff] [blame] | 4070 | if (selinux_secmark_enabled()) { |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4071 | err = avc_has_perm(sk_sid, skb->secmark, SECCLASS_PACKET, |
Paul Moore | d8395c8 | 2008-10-10 10:16:30 -0400 | [diff] [blame] | 4072 | PACKET__RECV, &ad); |
Paul Moore | 58bfbb5 | 2009-03-27 17:10:41 -0400 | [diff] [blame] | 4073 | if (err) |
| 4074 | return err; |
| 4075 | } |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4076 | |
Steffen Klassert | b9679a7 | 2011-02-23 12:55:21 +0100 | [diff] [blame] | 4077 | err = selinux_netlbl_sock_rcv_skb(sksec, skb, family, &ad); |
| 4078 | if (err) |
| 4079 | return err; |
| 4080 | err = selinux_xfrm_sock_rcv_skb(sksec->sid, skb, &ad); |
Trent Jaeger | d28d1e0 | 2005-12-13 23:12:40 -0800 | [diff] [blame] | 4081 | |
James Morris | 4e5ab4c | 2006-06-09 00:33:33 -0700 | [diff] [blame] | 4082 | return err; |
| 4083 | } |
Trent Jaeger | d28d1e0 | 2005-12-13 23:12:40 -0800 | [diff] [blame] | 4084 | |
James Morris | 4e5ab4c | 2006-06-09 00:33:33 -0700 | [diff] [blame] | 4085 | static int selinux_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb) |
| 4086 | { |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4087 | int err; |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 4088 | struct sk_security_struct *sksec = sk->sk_security; |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4089 | u16 family = sk->sk_family; |
| 4090 | u32 sk_sid = sksec->sid; |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 4091 | struct common_audit_data ad; |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4092 | char *addrp; |
Paul Moore | d8395c8 | 2008-10-10 10:16:30 -0400 | [diff] [blame] | 4093 | u8 secmark_active; |
| 4094 | u8 peerlbl_active; |
James Morris | 4e5ab4c | 2006-06-09 00:33:33 -0700 | [diff] [blame] | 4095 | |
James Morris | 4e5ab4c | 2006-06-09 00:33:33 -0700 | [diff] [blame] | 4096 | if (family != PF_INET && family != PF_INET6) |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4097 | return 0; |
James Morris | 4e5ab4c | 2006-06-09 00:33:33 -0700 | [diff] [blame] | 4098 | |
| 4099 | /* Handle mapped IPv4 packets arriving via IPv6 sockets */ |
Al Viro | 87fcd70 | 2006-12-04 22:00:55 +0000 | [diff] [blame] | 4100 | if (family == PF_INET6 && skb->protocol == htons(ETH_P_IP)) |
James Morris | 4e5ab4c | 2006-06-09 00:33:33 -0700 | [diff] [blame] | 4101 | family = PF_INET; |
| 4102 | |
Paul Moore | d8395c8 | 2008-10-10 10:16:30 -0400 | [diff] [blame] | 4103 | /* If any sort of compatibility mode is enabled then handoff processing |
| 4104 | * to the selinux_sock_rcv_skb_compat() function to deal with the |
| 4105 | * special handling. We do this in an attempt to keep this function |
| 4106 | * as fast and as clean as possible. */ |
Paul Moore | 58bfbb5 | 2009-03-27 17:10:41 -0400 | [diff] [blame] | 4107 | if (!selinux_policycap_netpeer) |
Paul Moore | d8395c8 | 2008-10-10 10:16:30 -0400 | [diff] [blame] | 4108 | return selinux_sock_rcv_skb_compat(sk, skb, family); |
| 4109 | |
| 4110 | secmark_active = selinux_secmark_enabled(); |
| 4111 | peerlbl_active = netlbl_enabled() || selinux_xfrm_enabled(); |
| 4112 | if (!secmark_active && !peerlbl_active) |
| 4113 | return 0; |
| 4114 | |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 4115 | COMMON_AUDIT_DATA_INIT(&ad, NET); |
Eric Dumazet | 8964be4 | 2009-11-20 15:35:04 -0800 | [diff] [blame] | 4116 | ad.u.net.netif = skb->skb_iif; |
James Morris | 4e5ab4c | 2006-06-09 00:33:33 -0700 | [diff] [blame] | 4117 | ad.u.net.family = family; |
Paul Moore | 224dfbd | 2008-01-29 08:38:13 -0500 | [diff] [blame] | 4118 | err = selinux_parse_skb(skb, &ad, &addrp, 1, NULL); |
James Morris | 4e5ab4c | 2006-06-09 00:33:33 -0700 | [diff] [blame] | 4119 | if (err) |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4120 | return err; |
James Morris | 4e5ab4c | 2006-06-09 00:33:33 -0700 | [diff] [blame] | 4121 | |
Paul Moore | d8395c8 | 2008-10-10 10:16:30 -0400 | [diff] [blame] | 4122 | if (peerlbl_active) { |
Paul Moore | d621d35 | 2008-01-29 08:43:36 -0500 | [diff] [blame] | 4123 | u32 peer_sid; |
| 4124 | |
| 4125 | err = selinux_skb_peerlbl_sid(skb, family, &peer_sid); |
| 4126 | if (err) |
| 4127 | return err; |
Eric Dumazet | 8964be4 | 2009-11-20 15:35:04 -0800 | [diff] [blame] | 4128 | err = selinux_inet_sys_rcv_skb(skb->skb_iif, addrp, family, |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4129 | peer_sid, &ad); |
Paul Moore | dfaebe9 | 2008-10-10 10:16:31 -0400 | [diff] [blame] | 4130 | if (err) { |
| 4131 | selinux_netlbl_err(skb, err, 0); |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4132 | return err; |
Paul Moore | dfaebe9 | 2008-10-10 10:16:31 -0400 | [diff] [blame] | 4133 | } |
Paul Moore | d621d35 | 2008-01-29 08:43:36 -0500 | [diff] [blame] | 4134 | err = avc_has_perm(sk_sid, peer_sid, SECCLASS_PEER, |
| 4135 | PEER__RECV, &ad); |
Paul Moore | dfaebe9 | 2008-10-10 10:16:31 -0400 | [diff] [blame] | 4136 | if (err) |
| 4137 | selinux_netlbl_err(skb, err, 0); |
Paul Moore | d621d35 | 2008-01-29 08:43:36 -0500 | [diff] [blame] | 4138 | } |
| 4139 | |
Paul Moore | d8395c8 | 2008-10-10 10:16:30 -0400 | [diff] [blame] | 4140 | if (secmark_active) { |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4141 | err = avc_has_perm(sk_sid, skb->secmark, SECCLASS_PACKET, |
| 4142 | PACKET__RECV, &ad); |
| 4143 | if (err) |
| 4144 | return err; |
| 4145 | } |
| 4146 | |
Paul Moore | d621d35 | 2008-01-29 08:43:36 -0500 | [diff] [blame] | 4147 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4148 | } |
| 4149 | |
Catherine Zhang | 2c7946a | 2006-03-20 22:41:23 -0800 | [diff] [blame] | 4150 | static int selinux_socket_getpeersec_stream(struct socket *sock, char __user *optval, |
| 4151 | int __user *optlen, unsigned len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4152 | { |
| 4153 | int err = 0; |
| 4154 | char *scontext; |
| 4155 | u32 scontext_len; |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 4156 | struct sk_security_struct *sksec = sock->sk->sk_security; |
Paul Moore | 3de4bab | 2006-11-17 17:38:54 -0500 | [diff] [blame] | 4157 | u32 peer_sid = SECSID_NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4158 | |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 4159 | if (sksec->sclass == SECCLASS_UNIX_STREAM_SOCKET || |
| 4160 | sksec->sclass == SECCLASS_TCP_SOCKET) |
Eric Paris | dd3e783 | 2010-04-07 15:08:46 -0400 | [diff] [blame] | 4161 | peer_sid = sksec->peer_sid; |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 4162 | if (peer_sid == SECSID_NULL) |
| 4163 | return -ENOPROTOOPT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4164 | |
Catherine Zhang | 2c7946a | 2006-03-20 22:41:23 -0800 | [diff] [blame] | 4165 | err = security_sid_to_context(peer_sid, &scontext, &scontext_len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4166 | if (err) |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 4167 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4168 | |
| 4169 | if (scontext_len > len) { |
| 4170 | err = -ERANGE; |
| 4171 | goto out_len; |
| 4172 | } |
| 4173 | |
| 4174 | if (copy_to_user(optval, scontext, scontext_len)) |
| 4175 | err = -EFAULT; |
| 4176 | |
| 4177 | out_len: |
| 4178 | if (put_user(scontext_len, optlen)) |
| 4179 | err = -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4180 | kfree(scontext); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4181 | return err; |
| 4182 | } |
| 4183 | |
Catherine Zhang | dc49c1f | 2006-08-02 14:12:06 -0700 | [diff] [blame] | 4184 | 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] | 4185 | { |
Catherine Zhang | dc49c1f | 2006-08-02 14:12:06 -0700 | [diff] [blame] | 4186 | u32 peer_secid = SECSID_NULL; |
Paul Moore | 75e2291 | 2008-01-29 08:38:04 -0500 | [diff] [blame] | 4187 | u16 family; |
Catherine Zhang | 877ce7c | 2006-06-29 12:27:47 -0700 | [diff] [blame] | 4188 | |
Paul Moore | aa86290 | 2008-10-10 10:16:29 -0400 | [diff] [blame] | 4189 | if (skb && skb->protocol == htons(ETH_P_IP)) |
| 4190 | family = PF_INET; |
| 4191 | else if (skb && skb->protocol == htons(ETH_P_IPV6)) |
| 4192 | family = PF_INET6; |
| 4193 | else if (sock) |
Paul Moore | 75e2291 | 2008-01-29 08:38:04 -0500 | [diff] [blame] | 4194 | family = sock->sk->sk_family; |
Paul Moore | 75e2291 | 2008-01-29 08:38:04 -0500 | [diff] [blame] | 4195 | else |
| 4196 | goto out; |
| 4197 | |
| 4198 | if (sock && family == PF_UNIX) |
Ahmed S. Darwish | 713a04ae | 2008-03-01 21:52:30 +0200 | [diff] [blame] | 4199 | selinux_inode_getsecid(SOCK_INODE(sock), &peer_secid); |
Paul Moore | 3de4bab | 2006-11-17 17:38:54 -0500 | [diff] [blame] | 4200 | else if (skb) |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4201 | selinux_skb_peerlbl_sid(skb, family, &peer_secid); |
Catherine Zhang | 2c7946a | 2006-03-20 22:41:23 -0800 | [diff] [blame] | 4202 | |
Paul Moore | 75e2291 | 2008-01-29 08:38:04 -0500 | [diff] [blame] | 4203 | out: |
Catherine Zhang | dc49c1f | 2006-08-02 14:12:06 -0700 | [diff] [blame] | 4204 | *secid = peer_secid; |
Paul Moore | 75e2291 | 2008-01-29 08:38:04 -0500 | [diff] [blame] | 4205 | if (peer_secid == SECSID_NULL) |
| 4206 | return -EINVAL; |
| 4207 | return 0; |
Catherine Zhang | 2c7946a | 2006-03-20 22:41:23 -0800 | [diff] [blame] | 4208 | } |
| 4209 | |
Al Viro | 7d877f3 | 2005-10-21 03:20:43 -0400 | [diff] [blame] | 4210 | 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] | 4211 | { |
Paul Moore | 84914b7 | 2010-04-22 14:46:18 -0400 | [diff] [blame] | 4212 | struct sk_security_struct *sksec; |
| 4213 | |
| 4214 | sksec = kzalloc(sizeof(*sksec), priority); |
| 4215 | if (!sksec) |
| 4216 | return -ENOMEM; |
| 4217 | |
| 4218 | sksec->peer_sid = SECINITSID_UNLABELED; |
| 4219 | sksec->sid = SECINITSID_UNLABELED; |
| 4220 | selinux_netlbl_sk_security_reset(sksec); |
| 4221 | sk->sk_security = sksec; |
| 4222 | |
| 4223 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4224 | } |
| 4225 | |
| 4226 | static void selinux_sk_free_security(struct sock *sk) |
| 4227 | { |
Paul Moore | 84914b7 | 2010-04-22 14:46:18 -0400 | [diff] [blame] | 4228 | struct sk_security_struct *sksec = sk->sk_security; |
| 4229 | |
| 4230 | sk->sk_security = NULL; |
| 4231 | selinux_netlbl_sk_security_free(sksec); |
| 4232 | kfree(sksec); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4233 | } |
| 4234 | |
Venkat Yekkirala | 892c141 | 2006-08-04 23:08:56 -0700 | [diff] [blame] | 4235 | static void selinux_sk_clone_security(const struct sock *sk, struct sock *newsk) |
| 4236 | { |
Eric Paris | dd3e783 | 2010-04-07 15:08:46 -0400 | [diff] [blame] | 4237 | struct sk_security_struct *sksec = sk->sk_security; |
| 4238 | struct sk_security_struct *newsksec = newsk->sk_security; |
Venkat Yekkirala | 892c141 | 2006-08-04 23:08:56 -0700 | [diff] [blame] | 4239 | |
Eric Paris | dd3e783 | 2010-04-07 15:08:46 -0400 | [diff] [blame] | 4240 | newsksec->sid = sksec->sid; |
| 4241 | newsksec->peer_sid = sksec->peer_sid; |
| 4242 | newsksec->sclass = sksec->sclass; |
Paul Moore | 99f59ed | 2006-08-29 17:53:48 -0700 | [diff] [blame] | 4243 | |
Eric Paris | dd3e783 | 2010-04-07 15:08:46 -0400 | [diff] [blame] | 4244 | selinux_netlbl_sk_security_reset(newsksec); |
Venkat Yekkirala | 892c141 | 2006-08-04 23:08:56 -0700 | [diff] [blame] | 4245 | } |
| 4246 | |
Venkat Yekkirala | beb8d13 | 2006-08-04 23:12:42 -0700 | [diff] [blame] | 4247 | static void selinux_sk_getsecid(struct sock *sk, u32 *secid) |
Trent Jaeger | d28d1e0 | 2005-12-13 23:12:40 -0800 | [diff] [blame] | 4248 | { |
Trent Jaeger | d28d1e0 | 2005-12-13 23:12:40 -0800 | [diff] [blame] | 4249 | if (!sk) |
Venkat Yekkirala | beb8d13 | 2006-08-04 23:12:42 -0700 | [diff] [blame] | 4250 | *secid = SECINITSID_ANY_SOCKET; |
Venkat Yekkirala | 892c141 | 2006-08-04 23:08:56 -0700 | [diff] [blame] | 4251 | else { |
| 4252 | struct sk_security_struct *sksec = sk->sk_security; |
Trent Jaeger | d28d1e0 | 2005-12-13 23:12:40 -0800 | [diff] [blame] | 4253 | |
Venkat Yekkirala | beb8d13 | 2006-08-04 23:12:42 -0700 | [diff] [blame] | 4254 | *secid = sksec->sid; |
Venkat Yekkirala | 892c141 | 2006-08-04 23:08:56 -0700 | [diff] [blame] | 4255 | } |
Trent Jaeger | d28d1e0 | 2005-12-13 23:12:40 -0800 | [diff] [blame] | 4256 | } |
| 4257 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 4258 | static void selinux_sock_graft(struct sock *sk, struct socket *parent) |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 4259 | { |
| 4260 | struct inode_security_struct *isec = SOCK_INODE(parent)->i_security; |
| 4261 | struct sk_security_struct *sksec = sk->sk_security; |
| 4262 | |
David Woodhouse | 2148ccc | 2006-09-29 15:50:25 -0700 | [diff] [blame] | 4263 | if (sk->sk_family == PF_INET || sk->sk_family == PF_INET6 || |
| 4264 | sk->sk_family == PF_UNIX) |
| 4265 | isec->sid = sksec->sid; |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4266 | sksec->sclass = isec->sclass; |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 4267 | } |
| 4268 | |
Adrian Bunk | 9a673e5 | 2006-08-15 00:03:53 -0700 | [diff] [blame] | 4269 | static int selinux_inet_conn_request(struct sock *sk, struct sk_buff *skb, |
| 4270 | struct request_sock *req) |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 4271 | { |
| 4272 | struct sk_security_struct *sksec = sk->sk_security; |
| 4273 | int err; |
Paul Moore | aa86290 | 2008-10-10 10:16:29 -0400 | [diff] [blame] | 4274 | u16 family = sk->sk_family; |
Venkat Yekkirala | 7420ed2 | 2006-08-04 23:17:57 -0700 | [diff] [blame] | 4275 | u32 newsid; |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 4276 | u32 peersid; |
| 4277 | |
Paul Moore | aa86290 | 2008-10-10 10:16:29 -0400 | [diff] [blame] | 4278 | /* handle mapped IPv4 packets arriving via IPv6 sockets */ |
| 4279 | if (family == PF_INET6 && skb->protocol == htons(ETH_P_IP)) |
| 4280 | family = PF_INET; |
| 4281 | |
| 4282 | err = selinux_skb_peerlbl_sid(skb, family, &peersid); |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 4283 | if (err) |
| 4284 | return err; |
Venkat Yekkirala | a51c64f | 2006-07-27 22:01:34 -0700 | [diff] [blame] | 4285 | if (peersid == SECSID_NULL) { |
| 4286 | req->secid = sksec->sid; |
Paul Moore | 3de4bab | 2006-11-17 17:38:54 -0500 | [diff] [blame] | 4287 | req->peer_secid = SECSID_NULL; |
Paul Moore | 389fb800 | 2009-03-27 17:10:34 -0400 | [diff] [blame] | 4288 | } else { |
| 4289 | err = security_sid_mls_copy(sksec->sid, peersid, &newsid); |
| 4290 | if (err) |
| 4291 | return err; |
| 4292 | req->secid = newsid; |
| 4293 | req->peer_secid = peersid; |
Venkat Yekkirala | a51c64f | 2006-07-27 22:01:34 -0700 | [diff] [blame] | 4294 | } |
| 4295 | |
Paul Moore | 389fb800 | 2009-03-27 17:10:34 -0400 | [diff] [blame] | 4296 | return selinux_netlbl_inet_conn_request(req, family); |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 4297 | } |
| 4298 | |
Adrian Bunk | 9a673e5 | 2006-08-15 00:03:53 -0700 | [diff] [blame] | 4299 | static void selinux_inet_csk_clone(struct sock *newsk, |
| 4300 | const struct request_sock *req) |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 4301 | { |
| 4302 | struct sk_security_struct *newsksec = newsk->sk_security; |
| 4303 | |
| 4304 | newsksec->sid = req->secid; |
Venkat Yekkirala | 6b87769 | 2006-11-08 17:04:09 -0600 | [diff] [blame] | 4305 | newsksec->peer_sid = req->peer_secid; |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 4306 | /* NOTE: Ideally, we should also get the isec->sid for the |
| 4307 | new socket in sync, but we don't have the isec available yet. |
| 4308 | So we will wait until sock_graft to do it, by which |
| 4309 | time it will have been created and available. */ |
Paul Moore | 99f59ed | 2006-08-29 17:53:48 -0700 | [diff] [blame] | 4310 | |
Paul Moore | 9f2ad66 | 2006-11-17 17:38:53 -0500 | [diff] [blame] | 4311 | /* We don't need to take any sort of lock here as we are the only |
| 4312 | * thread with access to newsksec */ |
Paul Moore | 389fb800 | 2009-03-27 17:10:34 -0400 | [diff] [blame] | 4313 | selinux_netlbl_inet_csk_clone(newsk, req->rsk_ops->family); |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 4314 | } |
| 4315 | |
Paul Moore | 014ab19 | 2008-10-10 10:16:33 -0400 | [diff] [blame] | 4316 | 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] | 4317 | { |
Paul Moore | aa86290 | 2008-10-10 10:16:29 -0400 | [diff] [blame] | 4318 | u16 family = sk->sk_family; |
Venkat Yekkirala | 6b87769 | 2006-11-08 17:04:09 -0600 | [diff] [blame] | 4319 | struct sk_security_struct *sksec = sk->sk_security; |
| 4320 | |
Paul Moore | aa86290 | 2008-10-10 10:16:29 -0400 | [diff] [blame] | 4321 | /* handle mapped IPv4 packets arriving via IPv6 sockets */ |
| 4322 | if (family == PF_INET6 && skb->protocol == htons(ETH_P_IP)) |
| 4323 | family = PF_INET; |
| 4324 | |
| 4325 | selinux_skb_peerlbl_sid(skb, family, &sksec->peer_sid); |
Venkat Yekkirala | 6b87769 | 2006-11-08 17:04:09 -0600 | [diff] [blame] | 4326 | } |
| 4327 | |
Eric Paris | 2606fd1 | 2010-10-13 16:24:41 -0400 | [diff] [blame] | 4328 | static int selinux_secmark_relabel_packet(u32 sid) |
| 4329 | { |
| 4330 | const struct task_security_struct *__tsec; |
| 4331 | u32 tsid; |
| 4332 | |
| 4333 | __tsec = current_security(); |
| 4334 | tsid = __tsec->sid; |
| 4335 | |
| 4336 | return avc_has_perm(tsid, sid, SECCLASS_PACKET, PACKET__RELABELTO, NULL); |
| 4337 | } |
| 4338 | |
| 4339 | static void selinux_secmark_refcount_inc(void) |
| 4340 | { |
| 4341 | atomic_inc(&selinux_secmark_refcount); |
| 4342 | } |
| 4343 | |
| 4344 | static void selinux_secmark_refcount_dec(void) |
| 4345 | { |
| 4346 | atomic_dec(&selinux_secmark_refcount); |
| 4347 | } |
| 4348 | |
Adrian Bunk | 9a673e5 | 2006-08-15 00:03:53 -0700 | [diff] [blame] | 4349 | static void selinux_req_classify_flow(const struct request_sock *req, |
| 4350 | struct flowi *fl) |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 4351 | { |
David S. Miller | 1d28f42 | 2011-03-12 00:29:39 -0500 | [diff] [blame] | 4352 | fl->flowi_secid = req->secid; |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 4353 | } |
| 4354 | |
Paul Moore | ed6d76e | 2009-08-28 18:12:49 -0400 | [diff] [blame] | 4355 | static int selinux_tun_dev_create(void) |
| 4356 | { |
| 4357 | u32 sid = current_sid(); |
| 4358 | |
| 4359 | /* we aren't taking into account the "sockcreate" SID since the socket |
| 4360 | * that is being created here is not a socket in the traditional sense, |
| 4361 | * instead it is a private sock, accessible only to the kernel, and |
| 4362 | * representing a wide range of network traffic spanning multiple |
| 4363 | * connections unlike traditional sockets - check the TUN driver to |
| 4364 | * get a better understanding of why this socket is special */ |
| 4365 | |
| 4366 | return avc_has_perm(sid, sid, SECCLASS_TUN_SOCKET, TUN_SOCKET__CREATE, |
| 4367 | NULL); |
| 4368 | } |
| 4369 | |
| 4370 | static void selinux_tun_dev_post_create(struct sock *sk) |
| 4371 | { |
| 4372 | struct sk_security_struct *sksec = sk->sk_security; |
| 4373 | |
| 4374 | /* we don't currently perform any NetLabel based labeling here and it |
| 4375 | * isn't clear that we would want to do so anyway; while we could apply |
| 4376 | * labeling without the support of the TUN user the resulting labeled |
| 4377 | * traffic from the other end of the connection would almost certainly |
| 4378 | * cause confusion to the TUN user that had no idea network labeling |
| 4379 | * protocols were being used */ |
| 4380 | |
| 4381 | /* see the comments in selinux_tun_dev_create() about why we don't use |
| 4382 | * the sockcreate SID here */ |
| 4383 | |
| 4384 | sksec->sid = current_sid(); |
| 4385 | sksec->sclass = SECCLASS_TUN_SOCKET; |
| 4386 | } |
| 4387 | |
| 4388 | static int selinux_tun_dev_attach(struct sock *sk) |
| 4389 | { |
| 4390 | struct sk_security_struct *sksec = sk->sk_security; |
| 4391 | u32 sid = current_sid(); |
| 4392 | int err; |
| 4393 | |
| 4394 | err = avc_has_perm(sid, sksec->sid, SECCLASS_TUN_SOCKET, |
| 4395 | TUN_SOCKET__RELABELFROM, NULL); |
| 4396 | if (err) |
| 4397 | return err; |
| 4398 | err = avc_has_perm(sid, sid, SECCLASS_TUN_SOCKET, |
| 4399 | TUN_SOCKET__RELABELTO, NULL); |
| 4400 | if (err) |
| 4401 | return err; |
| 4402 | |
| 4403 | sksec->sid = sid; |
| 4404 | |
| 4405 | return 0; |
| 4406 | } |
| 4407 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4408 | static int selinux_nlmsg_perm(struct sock *sk, struct sk_buff *skb) |
| 4409 | { |
| 4410 | int err = 0; |
| 4411 | u32 perm; |
| 4412 | struct nlmsghdr *nlh; |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 4413 | struct sk_security_struct *sksec = sk->sk_security; |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 4414 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4415 | if (skb->len < NLMSG_SPACE(0)) { |
| 4416 | err = -EINVAL; |
| 4417 | goto out; |
| 4418 | } |
Arnaldo Carvalho de Melo | b529ccf | 2007-04-25 19:08:35 -0700 | [diff] [blame] | 4419 | nlh = nlmsg_hdr(skb); |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 4420 | |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 4421 | err = selinux_nlmsg_lookup(sksec->sclass, nlh->nlmsg_type, &perm); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4422 | if (err) { |
| 4423 | if (err == -EINVAL) { |
David Woodhouse | 9ad9ad3 | 2005-06-22 15:04:33 +0100 | [diff] [blame] | 4424 | audit_log(current->audit_context, GFP_KERNEL, AUDIT_SELINUX_ERR, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4425 | "SELinux: unrecognized netlink message" |
| 4426 | " type=%hu for sclass=%hu\n", |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 4427 | nlh->nlmsg_type, sksec->sclass); |
Eric Paris | 39c9aed | 2008-11-05 09:34:42 -0500 | [diff] [blame] | 4428 | if (!selinux_enforcing || security_get_allow_unknown()) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4429 | err = 0; |
| 4430 | } |
| 4431 | |
| 4432 | /* Ignore */ |
| 4433 | if (err == -ENOENT) |
| 4434 | err = 0; |
| 4435 | goto out; |
| 4436 | } |
| 4437 | |
Paul Moore | 253bfae | 2010-04-22 14:46:19 -0400 | [diff] [blame] | 4438 | err = sock_has_perm(current, sk, perm); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4439 | out: |
| 4440 | return err; |
| 4441 | } |
| 4442 | |
| 4443 | #ifdef CONFIG_NETFILTER |
| 4444 | |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4445 | static unsigned int selinux_ip_forward(struct sk_buff *skb, int ifindex, |
| 4446 | u16 family) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4447 | { |
Paul Moore | dfaebe9 | 2008-10-10 10:16:31 -0400 | [diff] [blame] | 4448 | int err; |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4449 | char *addrp; |
| 4450 | u32 peer_sid; |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 4451 | struct common_audit_data ad; |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4452 | u8 secmark_active; |
Paul Moore | 948bf85 | 2008-10-10 10:16:32 -0400 | [diff] [blame] | 4453 | u8 netlbl_active; |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4454 | u8 peerlbl_active; |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 4455 | |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4456 | if (!selinux_policycap_netpeer) |
| 4457 | return NF_ACCEPT; |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 4458 | |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4459 | secmark_active = selinux_secmark_enabled(); |
Paul Moore | 948bf85 | 2008-10-10 10:16:32 -0400 | [diff] [blame] | 4460 | netlbl_active = netlbl_enabled(); |
| 4461 | peerlbl_active = netlbl_active || selinux_xfrm_enabled(); |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4462 | if (!secmark_active && !peerlbl_active) |
| 4463 | return NF_ACCEPT; |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 4464 | |
Paul Moore | d8395c8 | 2008-10-10 10:16:30 -0400 | [diff] [blame] | 4465 | if (selinux_skb_peerlbl_sid(skb, family, &peer_sid) != 0) |
| 4466 | return NF_DROP; |
| 4467 | |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 4468 | COMMON_AUDIT_DATA_INIT(&ad, NET); |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4469 | ad.u.net.netif = ifindex; |
| 4470 | ad.u.net.family = family; |
| 4471 | if (selinux_parse_skb(skb, &ad, &addrp, 1, NULL) != 0) |
| 4472 | return NF_DROP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4473 | |
Paul Moore | dfaebe9 | 2008-10-10 10:16:31 -0400 | [diff] [blame] | 4474 | if (peerlbl_active) { |
| 4475 | err = selinux_inet_sys_rcv_skb(ifindex, addrp, family, |
| 4476 | peer_sid, &ad); |
| 4477 | if (err) { |
| 4478 | selinux_netlbl_err(skb, err, 1); |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4479 | return NF_DROP; |
Paul Moore | dfaebe9 | 2008-10-10 10:16:31 -0400 | [diff] [blame] | 4480 | } |
| 4481 | } |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4482 | |
| 4483 | if (secmark_active) |
| 4484 | if (avc_has_perm(peer_sid, skb->secmark, |
| 4485 | SECCLASS_PACKET, PACKET__FORWARD_IN, &ad)) |
| 4486 | return NF_DROP; |
| 4487 | |
Paul Moore | 948bf85 | 2008-10-10 10:16:32 -0400 | [diff] [blame] | 4488 | if (netlbl_active) |
| 4489 | /* we do this in the FORWARD path and not the POST_ROUTING |
| 4490 | * path because we want to make sure we apply the necessary |
| 4491 | * labeling before IPsec is applied so we can leverage AH |
| 4492 | * protection */ |
| 4493 | if (selinux_netlbl_skbuff_setsid(skb, family, peer_sid) != 0) |
| 4494 | return NF_DROP; |
| 4495 | |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4496 | return NF_ACCEPT; |
| 4497 | } |
| 4498 | |
| 4499 | static unsigned int selinux_ipv4_forward(unsigned int hooknum, |
| 4500 | struct sk_buff *skb, |
| 4501 | const struct net_device *in, |
| 4502 | const struct net_device *out, |
| 4503 | int (*okfn)(struct sk_buff *)) |
| 4504 | { |
| 4505 | return selinux_ip_forward(skb, in->ifindex, PF_INET); |
| 4506 | } |
| 4507 | |
| 4508 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
| 4509 | static unsigned int selinux_ipv6_forward(unsigned int hooknum, |
| 4510 | struct sk_buff *skb, |
| 4511 | const struct net_device *in, |
| 4512 | const struct net_device *out, |
| 4513 | int (*okfn)(struct sk_buff *)) |
| 4514 | { |
| 4515 | return selinux_ip_forward(skb, in->ifindex, PF_INET6); |
| 4516 | } |
| 4517 | #endif /* IPV6 */ |
| 4518 | |
Paul Moore | 948bf85 | 2008-10-10 10:16:32 -0400 | [diff] [blame] | 4519 | static unsigned int selinux_ip_output(struct sk_buff *skb, |
| 4520 | u16 family) |
| 4521 | { |
| 4522 | u32 sid; |
| 4523 | |
| 4524 | if (!netlbl_enabled()) |
| 4525 | return NF_ACCEPT; |
| 4526 | |
| 4527 | /* we do this in the LOCAL_OUT path and not the POST_ROUTING path |
| 4528 | * because we want to make sure we apply the necessary labeling |
| 4529 | * before IPsec is applied so we can leverage AH protection */ |
| 4530 | if (skb->sk) { |
| 4531 | struct sk_security_struct *sksec = skb->sk->sk_security; |
| 4532 | sid = sksec->sid; |
| 4533 | } else |
| 4534 | sid = SECINITSID_KERNEL; |
| 4535 | if (selinux_netlbl_skbuff_setsid(skb, family, sid) != 0) |
| 4536 | return NF_DROP; |
| 4537 | |
| 4538 | return NF_ACCEPT; |
| 4539 | } |
| 4540 | |
| 4541 | static unsigned int selinux_ipv4_output(unsigned int hooknum, |
| 4542 | struct sk_buff *skb, |
| 4543 | const struct net_device *in, |
| 4544 | const struct net_device *out, |
| 4545 | int (*okfn)(struct sk_buff *)) |
| 4546 | { |
| 4547 | return selinux_ip_output(skb, PF_INET); |
| 4548 | } |
| 4549 | |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4550 | static unsigned int selinux_ip_postroute_compat(struct sk_buff *skb, |
| 4551 | int ifindex, |
Paul Moore | d8395c8 | 2008-10-10 10:16:30 -0400 | [diff] [blame] | 4552 | u16 family) |
James Morris | 4e5ab4c | 2006-06-09 00:33:33 -0700 | [diff] [blame] | 4553 | { |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4554 | struct sock *sk = skb->sk; |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 4555 | struct sk_security_struct *sksec; |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 4556 | struct common_audit_data ad; |
Paul Moore | d8395c8 | 2008-10-10 10:16:30 -0400 | [diff] [blame] | 4557 | char *addrp; |
| 4558 | u8 proto; |
James Morris | 4e5ab4c | 2006-06-09 00:33:33 -0700 | [diff] [blame] | 4559 | |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4560 | if (sk == NULL) |
| 4561 | return NF_ACCEPT; |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 4562 | sksec = sk->sk_security; |
James Morris | 4e5ab4c | 2006-06-09 00:33:33 -0700 | [diff] [blame] | 4563 | |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 4564 | COMMON_AUDIT_DATA_INIT(&ad, NET); |
Paul Moore | d8395c8 | 2008-10-10 10:16:30 -0400 | [diff] [blame] | 4565 | ad.u.net.netif = ifindex; |
| 4566 | ad.u.net.family = family; |
| 4567 | if (selinux_parse_skb(skb, &ad, &addrp, 0, &proto)) |
| 4568 | return NF_DROP; |
| 4569 | |
Paul Moore | 58bfbb5 | 2009-03-27 17:10:41 -0400 | [diff] [blame] | 4570 | if (selinux_secmark_enabled()) |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4571 | if (avc_has_perm(sksec->sid, skb->secmark, |
Paul Moore | d8395c8 | 2008-10-10 10:16:30 -0400 | [diff] [blame] | 4572 | SECCLASS_PACKET, PACKET__SEND, &ad)) |
Eric Paris | 2fe66ec | 2010-11-23 06:28:08 +0000 | [diff] [blame] | 4573 | return NF_DROP_ERR(-ECONNREFUSED); |
James Morris | 4e5ab4c | 2006-06-09 00:33:33 -0700 | [diff] [blame] | 4574 | |
Steffen Klassert | b9679a7 | 2011-02-23 12:55:21 +0100 | [diff] [blame] | 4575 | if (selinux_xfrm_postroute_last(sksec->sid, skb, &ad, proto)) |
| 4576 | return NF_DROP_ERR(-ECONNREFUSED); |
James Morris | 4e5ab4c | 2006-06-09 00:33:33 -0700 | [diff] [blame] | 4577 | |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4578 | return NF_ACCEPT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4579 | } |
| 4580 | |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4581 | static unsigned int selinux_ip_postroute(struct sk_buff *skb, int ifindex, |
| 4582 | u16 family) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4583 | { |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4584 | u32 secmark_perm; |
| 4585 | u32 peer_sid; |
| 4586 | struct sock *sk; |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 4587 | struct common_audit_data ad; |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4588 | char *addrp; |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4589 | u8 secmark_active; |
| 4590 | u8 peerlbl_active; |
| 4591 | |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4592 | /* If any sort of compatibility mode is enabled then handoff processing |
| 4593 | * to the selinux_ip_postroute_compat() function to deal with the |
| 4594 | * special handling. We do this in an attempt to keep this function |
| 4595 | * as fast and as clean as possible. */ |
Paul Moore | 58bfbb5 | 2009-03-27 17:10:41 -0400 | [diff] [blame] | 4596 | if (!selinux_policycap_netpeer) |
Paul Moore | d8395c8 | 2008-10-10 10:16:30 -0400 | [diff] [blame] | 4597 | return selinux_ip_postroute_compat(skb, ifindex, family); |
Alexey Dobriyan | def8b4f | 2008-10-28 13:24:06 -0700 | [diff] [blame] | 4598 | #ifdef CONFIG_XFRM |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4599 | /* If skb->dst->xfrm is non-NULL then the packet is undergoing an IPsec |
| 4600 | * packet transformation so allow the packet to pass without any checks |
| 4601 | * since we'll have another chance to perform access control checks |
| 4602 | * when the packet is on it's final way out. |
| 4603 | * NOTE: there appear to be some IPv6 multicast cases where skb->dst |
| 4604 | * is NULL, in this case go ahead and apply access control. */ |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 4605 | if (skb_dst(skb) != NULL && skb_dst(skb)->xfrm != NULL) |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4606 | return NF_ACCEPT; |
Alexey Dobriyan | def8b4f | 2008-10-28 13:24:06 -0700 | [diff] [blame] | 4607 | #endif |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4608 | secmark_active = selinux_secmark_enabled(); |
| 4609 | peerlbl_active = netlbl_enabled() || selinux_xfrm_enabled(); |
| 4610 | if (!secmark_active && !peerlbl_active) |
| 4611 | return NF_ACCEPT; |
| 4612 | |
Paul Moore | d8395c8 | 2008-10-10 10:16:30 -0400 | [diff] [blame] | 4613 | /* if the packet is being forwarded then get the peer label from the |
| 4614 | * packet itself; otherwise check to see if it is from a local |
| 4615 | * application or the kernel, if from an application get the peer label |
| 4616 | * from the sending socket, otherwise use the kernel's sid */ |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4617 | sk = skb->sk; |
Paul Moore | d8395c8 | 2008-10-10 10:16:30 -0400 | [diff] [blame] | 4618 | if (sk == NULL) { |
Steffen Klassert | 4a7ab3d | 2011-02-23 12:56:23 +0100 | [diff] [blame] | 4619 | if (skb->skb_iif) { |
| 4620 | secmark_perm = PACKET__FORWARD_OUT; |
Paul Moore | d8395c8 | 2008-10-10 10:16:30 -0400 | [diff] [blame] | 4621 | if (selinux_skb_peerlbl_sid(skb, family, &peer_sid)) |
Eric Paris | 04f6d70 | 2010-11-23 06:28:02 +0000 | [diff] [blame] | 4622 | return NF_DROP; |
Steffen Klassert | 4a7ab3d | 2011-02-23 12:56:23 +0100 | [diff] [blame] | 4623 | } else { |
| 4624 | secmark_perm = PACKET__SEND; |
Paul Moore | d8395c8 | 2008-10-10 10:16:30 -0400 | [diff] [blame] | 4625 | peer_sid = SECINITSID_KERNEL; |
Steffen Klassert | 4a7ab3d | 2011-02-23 12:56:23 +0100 | [diff] [blame] | 4626 | } |
Paul Moore | d8395c8 | 2008-10-10 10:16:30 -0400 | [diff] [blame] | 4627 | } else { |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4628 | struct sk_security_struct *sksec = sk->sk_security; |
| 4629 | peer_sid = sksec->sid; |
| 4630 | secmark_perm = PACKET__SEND; |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4631 | } |
| 4632 | |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 4633 | COMMON_AUDIT_DATA_INIT(&ad, NET); |
Paul Moore | d8395c8 | 2008-10-10 10:16:30 -0400 | [diff] [blame] | 4634 | ad.u.net.netif = ifindex; |
| 4635 | ad.u.net.family = family; |
| 4636 | if (selinux_parse_skb(skb, &ad, &addrp, 0, NULL)) |
Eric Paris | 04f6d70 | 2010-11-23 06:28:02 +0000 | [diff] [blame] | 4637 | return NF_DROP; |
Paul Moore | d8395c8 | 2008-10-10 10:16:30 -0400 | [diff] [blame] | 4638 | |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4639 | if (secmark_active) |
| 4640 | if (avc_has_perm(peer_sid, skb->secmark, |
| 4641 | SECCLASS_PACKET, secmark_perm, &ad)) |
Eric Paris | 1f1aaf8 | 2010-11-16 11:52:57 +0000 | [diff] [blame] | 4642 | return NF_DROP_ERR(-ECONNREFUSED); |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4643 | |
| 4644 | if (peerlbl_active) { |
| 4645 | u32 if_sid; |
| 4646 | u32 node_sid; |
| 4647 | |
| 4648 | if (sel_netif_sid(ifindex, &if_sid)) |
Eric Paris | 04f6d70 | 2010-11-23 06:28:02 +0000 | [diff] [blame] | 4649 | return NF_DROP; |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4650 | if (avc_has_perm(peer_sid, if_sid, |
| 4651 | SECCLASS_NETIF, NETIF__EGRESS, &ad)) |
Eric Paris | 1f1aaf8 | 2010-11-16 11:52:57 +0000 | [diff] [blame] | 4652 | return NF_DROP_ERR(-ECONNREFUSED); |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4653 | |
| 4654 | if (sel_netnode_sid(addrp, family, &node_sid)) |
Eric Paris | 04f6d70 | 2010-11-23 06:28:02 +0000 | [diff] [blame] | 4655 | return NF_DROP; |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4656 | if (avc_has_perm(peer_sid, node_sid, |
| 4657 | SECCLASS_NODE, NODE__SENDTO, &ad)) |
Eric Paris | 1f1aaf8 | 2010-11-16 11:52:57 +0000 | [diff] [blame] | 4658 | return NF_DROP_ERR(-ECONNREFUSED); |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4659 | } |
| 4660 | |
| 4661 | return NF_ACCEPT; |
| 4662 | } |
| 4663 | |
| 4664 | static unsigned int selinux_ipv4_postroute(unsigned int hooknum, |
| 4665 | struct sk_buff *skb, |
| 4666 | const struct net_device *in, |
| 4667 | const struct net_device *out, |
| 4668 | int (*okfn)(struct sk_buff *)) |
| 4669 | { |
| 4670 | return selinux_ip_postroute(skb, out->ifindex, PF_INET); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4671 | } |
| 4672 | |
| 4673 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4674 | static unsigned int selinux_ipv6_postroute(unsigned int hooknum, |
| 4675 | struct sk_buff *skb, |
| 4676 | const struct net_device *in, |
| 4677 | const struct net_device *out, |
| 4678 | int (*okfn)(struct sk_buff *)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4679 | { |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 4680 | return selinux_ip_postroute(skb, out->ifindex, PF_INET6); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4681 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4682 | #endif /* IPV6 */ |
| 4683 | |
| 4684 | #endif /* CONFIG_NETFILTER */ |
| 4685 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4686 | static int selinux_netlink_send(struct sock *sk, struct sk_buff *skb) |
| 4687 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4688 | int err; |
| 4689 | |
Eric Paris | 200ac53 | 2009-02-12 15:01:04 -0500 | [diff] [blame] | 4690 | err = cap_netlink_send(sk, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4691 | if (err) |
| 4692 | return err; |
| 4693 | |
Stephen Smalley | 941fc5b | 2009-10-01 14:48:23 -0400 | [diff] [blame] | 4694 | return selinux_nlmsg_perm(sk, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4695 | } |
| 4696 | |
Darrel Goeddel | c7bdb54 | 2006-06-27 13:26:11 -0700 | [diff] [blame] | 4697 | static int selinux_netlink_recv(struct sk_buff *skb, int capability) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4698 | { |
Darrel Goeddel | c7bdb54 | 2006-06-27 13:26:11 -0700 | [diff] [blame] | 4699 | int err; |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 4700 | struct common_audit_data ad; |
Patrick McHardy | c53fa1e | 2011-03-03 10:55:40 -0800 | [diff] [blame] | 4701 | u32 sid; |
Darrel Goeddel | c7bdb54 | 2006-06-27 13:26:11 -0700 | [diff] [blame] | 4702 | |
Eric Paris | 200ac53 | 2009-02-12 15:01:04 -0500 | [diff] [blame] | 4703 | err = cap_netlink_recv(skb, capability); |
Darrel Goeddel | c7bdb54 | 2006-06-27 13:26:11 -0700 | [diff] [blame] | 4704 | if (err) |
| 4705 | return err; |
| 4706 | |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 4707 | COMMON_AUDIT_DATA_INIT(&ad, CAP); |
Darrel Goeddel | c7bdb54 | 2006-06-27 13:26:11 -0700 | [diff] [blame] | 4708 | ad.u.cap = capability; |
| 4709 | |
Patrick McHardy | c53fa1e | 2011-03-03 10:55:40 -0800 | [diff] [blame] | 4710 | security_task_getsecid(current, &sid); |
| 4711 | return avc_has_perm(sid, sid, SECCLASS_CAPABILITY, |
| 4712 | CAP_TO_MASK(capability), &ad); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4713 | } |
| 4714 | |
| 4715 | static int ipc_alloc_security(struct task_struct *task, |
| 4716 | struct kern_ipc_perm *perm, |
| 4717 | u16 sclass) |
| 4718 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4719 | struct ipc_security_struct *isec; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 4720 | u32 sid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4721 | |
James Morris | 89d155e | 2005-10-30 14:59:21 -0800 | [diff] [blame] | 4722 | isec = kzalloc(sizeof(struct ipc_security_struct), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4723 | if (!isec) |
| 4724 | return -ENOMEM; |
| 4725 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 4726 | sid = task_sid(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4727 | isec->sclass = sclass; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 4728 | isec->sid = sid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4729 | perm->security = isec; |
| 4730 | |
| 4731 | return 0; |
| 4732 | } |
| 4733 | |
| 4734 | static void ipc_free_security(struct kern_ipc_perm *perm) |
| 4735 | { |
| 4736 | struct ipc_security_struct *isec = perm->security; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4737 | perm->security = NULL; |
| 4738 | kfree(isec); |
| 4739 | } |
| 4740 | |
| 4741 | static int msg_msg_alloc_security(struct msg_msg *msg) |
| 4742 | { |
| 4743 | struct msg_security_struct *msec; |
| 4744 | |
James Morris | 89d155e | 2005-10-30 14:59:21 -0800 | [diff] [blame] | 4745 | msec = kzalloc(sizeof(struct msg_security_struct), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4746 | if (!msec) |
| 4747 | return -ENOMEM; |
| 4748 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4749 | msec->sid = SECINITSID_UNLABELED; |
| 4750 | msg->security = msec; |
| 4751 | |
| 4752 | return 0; |
| 4753 | } |
| 4754 | |
| 4755 | static void msg_msg_free_security(struct msg_msg *msg) |
| 4756 | { |
| 4757 | struct msg_security_struct *msec = msg->security; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4758 | |
| 4759 | msg->security = NULL; |
| 4760 | kfree(msec); |
| 4761 | } |
| 4762 | |
| 4763 | static int ipc_has_perm(struct kern_ipc_perm *ipc_perms, |
Stephen Smalley | 6af963f | 2005-05-01 08:58:39 -0700 | [diff] [blame] | 4764 | u32 perms) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4765 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4766 | struct ipc_security_struct *isec; |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 4767 | struct common_audit_data ad; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 4768 | u32 sid = current_sid(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4769 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4770 | isec = ipc_perms->security; |
| 4771 | |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 4772 | COMMON_AUDIT_DATA_INIT(&ad, IPC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4773 | ad.u.ipc_id = ipc_perms->key; |
| 4774 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 4775 | return avc_has_perm(sid, isec->sid, isec->sclass, perms, &ad); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4776 | } |
| 4777 | |
| 4778 | static int selinux_msg_msg_alloc_security(struct msg_msg *msg) |
| 4779 | { |
| 4780 | return msg_msg_alloc_security(msg); |
| 4781 | } |
| 4782 | |
| 4783 | static void selinux_msg_msg_free_security(struct msg_msg *msg) |
| 4784 | { |
| 4785 | msg_msg_free_security(msg); |
| 4786 | } |
| 4787 | |
| 4788 | /* message queue security operations */ |
| 4789 | static int selinux_msg_queue_alloc_security(struct msg_queue *msq) |
| 4790 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4791 | struct ipc_security_struct *isec; |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 4792 | struct common_audit_data ad; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 4793 | u32 sid = current_sid(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4794 | int rc; |
| 4795 | |
| 4796 | rc = ipc_alloc_security(current, &msq->q_perm, SECCLASS_MSGQ); |
| 4797 | if (rc) |
| 4798 | return rc; |
| 4799 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4800 | isec = msq->q_perm.security; |
| 4801 | |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 4802 | COMMON_AUDIT_DATA_INIT(&ad, IPC); |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 4803 | ad.u.ipc_id = msq->q_perm.key; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4804 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 4805 | rc = avc_has_perm(sid, isec->sid, SECCLASS_MSGQ, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4806 | MSGQ__CREATE, &ad); |
| 4807 | if (rc) { |
| 4808 | ipc_free_security(&msq->q_perm); |
| 4809 | return rc; |
| 4810 | } |
| 4811 | return 0; |
| 4812 | } |
| 4813 | |
| 4814 | static void selinux_msg_queue_free_security(struct msg_queue *msq) |
| 4815 | { |
| 4816 | ipc_free_security(&msq->q_perm); |
| 4817 | } |
| 4818 | |
| 4819 | static int selinux_msg_queue_associate(struct msg_queue *msq, int msqflg) |
| 4820 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4821 | struct ipc_security_struct *isec; |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 4822 | struct common_audit_data ad; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 4823 | u32 sid = current_sid(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4824 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4825 | isec = msq->q_perm.security; |
| 4826 | |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 4827 | COMMON_AUDIT_DATA_INIT(&ad, IPC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4828 | ad.u.ipc_id = msq->q_perm.key; |
| 4829 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 4830 | return avc_has_perm(sid, isec->sid, SECCLASS_MSGQ, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4831 | MSGQ__ASSOCIATE, &ad); |
| 4832 | } |
| 4833 | |
| 4834 | static int selinux_msg_queue_msgctl(struct msg_queue *msq, int cmd) |
| 4835 | { |
| 4836 | int err; |
| 4837 | int perms; |
| 4838 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 4839 | switch (cmd) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4840 | case IPC_INFO: |
| 4841 | case MSG_INFO: |
| 4842 | /* No specific object, just general system-wide information. */ |
| 4843 | return task_has_system(current, SYSTEM__IPC_INFO); |
| 4844 | case IPC_STAT: |
| 4845 | case MSG_STAT: |
| 4846 | perms = MSGQ__GETATTR | MSGQ__ASSOCIATE; |
| 4847 | break; |
| 4848 | case IPC_SET: |
| 4849 | perms = MSGQ__SETATTR; |
| 4850 | break; |
| 4851 | case IPC_RMID: |
| 4852 | perms = MSGQ__DESTROY; |
| 4853 | break; |
| 4854 | default: |
| 4855 | return 0; |
| 4856 | } |
| 4857 | |
Stephen Smalley | 6af963f | 2005-05-01 08:58:39 -0700 | [diff] [blame] | 4858 | err = ipc_has_perm(&msq->q_perm, perms); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4859 | return err; |
| 4860 | } |
| 4861 | |
| 4862 | static int selinux_msg_queue_msgsnd(struct msg_queue *msq, struct msg_msg *msg, int msqflg) |
| 4863 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4864 | struct ipc_security_struct *isec; |
| 4865 | struct msg_security_struct *msec; |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 4866 | struct common_audit_data ad; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 4867 | u32 sid = current_sid(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4868 | int rc; |
| 4869 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4870 | isec = msq->q_perm.security; |
| 4871 | msec = msg->security; |
| 4872 | |
| 4873 | /* |
| 4874 | * First time through, need to assign label to the message |
| 4875 | */ |
| 4876 | if (msec->sid == SECINITSID_UNLABELED) { |
| 4877 | /* |
| 4878 | * Compute new sid based on current process and |
| 4879 | * message queue this message will be stored in |
| 4880 | */ |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 4881 | rc = security_transition_sid(sid, isec->sid, SECCLASS_MSG, |
Eric Paris | 652bb9b | 2011-02-01 11:05:40 -0500 | [diff] [blame] | 4882 | NULL, &msec->sid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4883 | if (rc) |
| 4884 | return rc; |
| 4885 | } |
| 4886 | |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 4887 | COMMON_AUDIT_DATA_INIT(&ad, IPC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4888 | ad.u.ipc_id = msq->q_perm.key; |
| 4889 | |
| 4890 | /* Can this process write to the queue? */ |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 4891 | rc = avc_has_perm(sid, isec->sid, SECCLASS_MSGQ, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4892 | MSGQ__WRITE, &ad); |
| 4893 | if (!rc) |
| 4894 | /* Can this process send the message */ |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 4895 | rc = avc_has_perm(sid, msec->sid, SECCLASS_MSG, |
| 4896 | MSG__SEND, &ad); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4897 | if (!rc) |
| 4898 | /* Can the message be put in the queue? */ |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 4899 | rc = avc_has_perm(msec->sid, isec->sid, SECCLASS_MSGQ, |
| 4900 | MSGQ__ENQUEUE, &ad); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4901 | |
| 4902 | return rc; |
| 4903 | } |
| 4904 | |
| 4905 | static int selinux_msg_queue_msgrcv(struct msg_queue *msq, struct msg_msg *msg, |
| 4906 | struct task_struct *target, |
| 4907 | long type, int mode) |
| 4908 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4909 | struct ipc_security_struct *isec; |
| 4910 | struct msg_security_struct *msec; |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 4911 | struct common_audit_data ad; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 4912 | u32 sid = task_sid(target); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4913 | int rc; |
| 4914 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4915 | isec = msq->q_perm.security; |
| 4916 | msec = msg->security; |
| 4917 | |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 4918 | COMMON_AUDIT_DATA_INIT(&ad, IPC); |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 4919 | ad.u.ipc_id = msq->q_perm.key; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4920 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 4921 | rc = avc_has_perm(sid, isec->sid, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4922 | SECCLASS_MSGQ, MSGQ__READ, &ad); |
| 4923 | if (!rc) |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 4924 | rc = avc_has_perm(sid, msec->sid, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4925 | SECCLASS_MSG, MSG__RECEIVE, &ad); |
| 4926 | return rc; |
| 4927 | } |
| 4928 | |
| 4929 | /* Shared Memory security operations */ |
| 4930 | static int selinux_shm_alloc_security(struct shmid_kernel *shp) |
| 4931 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4932 | struct ipc_security_struct *isec; |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 4933 | struct common_audit_data ad; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 4934 | u32 sid = current_sid(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4935 | int rc; |
| 4936 | |
| 4937 | rc = ipc_alloc_security(current, &shp->shm_perm, SECCLASS_SHM); |
| 4938 | if (rc) |
| 4939 | return rc; |
| 4940 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4941 | isec = shp->shm_perm.security; |
| 4942 | |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 4943 | COMMON_AUDIT_DATA_INIT(&ad, IPC); |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 4944 | ad.u.ipc_id = shp->shm_perm.key; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4945 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 4946 | rc = avc_has_perm(sid, isec->sid, SECCLASS_SHM, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4947 | SHM__CREATE, &ad); |
| 4948 | if (rc) { |
| 4949 | ipc_free_security(&shp->shm_perm); |
| 4950 | return rc; |
| 4951 | } |
| 4952 | return 0; |
| 4953 | } |
| 4954 | |
| 4955 | static void selinux_shm_free_security(struct shmid_kernel *shp) |
| 4956 | { |
| 4957 | ipc_free_security(&shp->shm_perm); |
| 4958 | } |
| 4959 | |
| 4960 | static int selinux_shm_associate(struct shmid_kernel *shp, int shmflg) |
| 4961 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4962 | struct ipc_security_struct *isec; |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 4963 | struct common_audit_data ad; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 4964 | u32 sid = current_sid(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4965 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4966 | isec = shp->shm_perm.security; |
| 4967 | |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 4968 | COMMON_AUDIT_DATA_INIT(&ad, IPC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4969 | ad.u.ipc_id = shp->shm_perm.key; |
| 4970 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 4971 | return avc_has_perm(sid, isec->sid, SECCLASS_SHM, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4972 | SHM__ASSOCIATE, &ad); |
| 4973 | } |
| 4974 | |
| 4975 | /* Note, at this point, shp is locked down */ |
| 4976 | static int selinux_shm_shmctl(struct shmid_kernel *shp, int cmd) |
| 4977 | { |
| 4978 | int perms; |
| 4979 | int err; |
| 4980 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 4981 | switch (cmd) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4982 | case IPC_INFO: |
| 4983 | case SHM_INFO: |
| 4984 | /* No specific object, just general system-wide information. */ |
| 4985 | return task_has_system(current, SYSTEM__IPC_INFO); |
| 4986 | case IPC_STAT: |
| 4987 | case SHM_STAT: |
| 4988 | perms = SHM__GETATTR | SHM__ASSOCIATE; |
| 4989 | break; |
| 4990 | case IPC_SET: |
| 4991 | perms = SHM__SETATTR; |
| 4992 | break; |
| 4993 | case SHM_LOCK: |
| 4994 | case SHM_UNLOCK: |
| 4995 | perms = SHM__LOCK; |
| 4996 | break; |
| 4997 | case IPC_RMID: |
| 4998 | perms = SHM__DESTROY; |
| 4999 | break; |
| 5000 | default: |
| 5001 | return 0; |
| 5002 | } |
| 5003 | |
Stephen Smalley | 6af963f | 2005-05-01 08:58:39 -0700 | [diff] [blame] | 5004 | err = ipc_has_perm(&shp->shm_perm, perms); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5005 | return err; |
| 5006 | } |
| 5007 | |
| 5008 | static int selinux_shm_shmat(struct shmid_kernel *shp, |
| 5009 | char __user *shmaddr, int shmflg) |
| 5010 | { |
| 5011 | u32 perms; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5012 | |
| 5013 | if (shmflg & SHM_RDONLY) |
| 5014 | perms = SHM__READ; |
| 5015 | else |
| 5016 | perms = SHM__READ | SHM__WRITE; |
| 5017 | |
Stephen Smalley | 6af963f | 2005-05-01 08:58:39 -0700 | [diff] [blame] | 5018 | return ipc_has_perm(&shp->shm_perm, perms); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5019 | } |
| 5020 | |
| 5021 | /* Semaphore security operations */ |
| 5022 | static int selinux_sem_alloc_security(struct sem_array *sma) |
| 5023 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5024 | struct ipc_security_struct *isec; |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 5025 | struct common_audit_data ad; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5026 | u32 sid = current_sid(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5027 | int rc; |
| 5028 | |
| 5029 | rc = ipc_alloc_security(current, &sma->sem_perm, SECCLASS_SEM); |
| 5030 | if (rc) |
| 5031 | return rc; |
| 5032 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5033 | isec = sma->sem_perm.security; |
| 5034 | |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 5035 | COMMON_AUDIT_DATA_INIT(&ad, IPC); |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5036 | ad.u.ipc_id = sma->sem_perm.key; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5037 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5038 | rc = avc_has_perm(sid, isec->sid, SECCLASS_SEM, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5039 | SEM__CREATE, &ad); |
| 5040 | if (rc) { |
| 5041 | ipc_free_security(&sma->sem_perm); |
| 5042 | return rc; |
| 5043 | } |
| 5044 | return 0; |
| 5045 | } |
| 5046 | |
| 5047 | static void selinux_sem_free_security(struct sem_array *sma) |
| 5048 | { |
| 5049 | ipc_free_security(&sma->sem_perm); |
| 5050 | } |
| 5051 | |
| 5052 | static int selinux_sem_associate(struct sem_array *sma, int semflg) |
| 5053 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5054 | struct ipc_security_struct *isec; |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 5055 | struct common_audit_data ad; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5056 | u32 sid = current_sid(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5057 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5058 | isec = sma->sem_perm.security; |
| 5059 | |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 5060 | COMMON_AUDIT_DATA_INIT(&ad, IPC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5061 | ad.u.ipc_id = sma->sem_perm.key; |
| 5062 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5063 | return avc_has_perm(sid, isec->sid, SECCLASS_SEM, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5064 | SEM__ASSOCIATE, &ad); |
| 5065 | } |
| 5066 | |
| 5067 | /* Note, at this point, sma is locked down */ |
| 5068 | static int selinux_sem_semctl(struct sem_array *sma, int cmd) |
| 5069 | { |
| 5070 | int err; |
| 5071 | u32 perms; |
| 5072 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5073 | switch (cmd) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5074 | case IPC_INFO: |
| 5075 | case SEM_INFO: |
| 5076 | /* No specific object, just general system-wide information. */ |
| 5077 | return task_has_system(current, SYSTEM__IPC_INFO); |
| 5078 | case GETPID: |
| 5079 | case GETNCNT: |
| 5080 | case GETZCNT: |
| 5081 | perms = SEM__GETATTR; |
| 5082 | break; |
| 5083 | case GETVAL: |
| 5084 | case GETALL: |
| 5085 | perms = SEM__READ; |
| 5086 | break; |
| 5087 | case SETVAL: |
| 5088 | case SETALL: |
| 5089 | perms = SEM__WRITE; |
| 5090 | break; |
| 5091 | case IPC_RMID: |
| 5092 | perms = SEM__DESTROY; |
| 5093 | break; |
| 5094 | case IPC_SET: |
| 5095 | perms = SEM__SETATTR; |
| 5096 | break; |
| 5097 | case IPC_STAT: |
| 5098 | case SEM_STAT: |
| 5099 | perms = SEM__GETATTR | SEM__ASSOCIATE; |
| 5100 | break; |
| 5101 | default: |
| 5102 | return 0; |
| 5103 | } |
| 5104 | |
Stephen Smalley | 6af963f | 2005-05-01 08:58:39 -0700 | [diff] [blame] | 5105 | err = ipc_has_perm(&sma->sem_perm, perms); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5106 | return err; |
| 5107 | } |
| 5108 | |
| 5109 | static int selinux_sem_semop(struct sem_array *sma, |
| 5110 | struct sembuf *sops, unsigned nsops, int alter) |
| 5111 | { |
| 5112 | u32 perms; |
| 5113 | |
| 5114 | if (alter) |
| 5115 | perms = SEM__READ | SEM__WRITE; |
| 5116 | else |
| 5117 | perms = SEM__READ; |
| 5118 | |
Stephen Smalley | 6af963f | 2005-05-01 08:58:39 -0700 | [diff] [blame] | 5119 | return ipc_has_perm(&sma->sem_perm, perms); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5120 | } |
| 5121 | |
| 5122 | static int selinux_ipc_permission(struct kern_ipc_perm *ipcp, short flag) |
| 5123 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5124 | u32 av = 0; |
| 5125 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5126 | av = 0; |
| 5127 | if (flag & S_IRUGO) |
| 5128 | av |= IPC__UNIX_READ; |
| 5129 | if (flag & S_IWUGO) |
| 5130 | av |= IPC__UNIX_WRITE; |
| 5131 | |
| 5132 | if (av == 0) |
| 5133 | return 0; |
| 5134 | |
Stephen Smalley | 6af963f | 2005-05-01 08:58:39 -0700 | [diff] [blame] | 5135 | return ipc_has_perm(ipcp, av); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5136 | } |
| 5137 | |
Ahmed S. Darwish | 713a04ae | 2008-03-01 21:52:30 +0200 | [diff] [blame] | 5138 | static void selinux_ipc_getsecid(struct kern_ipc_perm *ipcp, u32 *secid) |
| 5139 | { |
| 5140 | struct ipc_security_struct *isec = ipcp->security; |
| 5141 | *secid = isec->sid; |
| 5142 | } |
| 5143 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5144 | static void selinux_d_instantiate(struct dentry *dentry, struct inode *inode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5145 | { |
| 5146 | if (inode) |
| 5147 | inode_doinit_with_dentry(inode, dentry); |
| 5148 | } |
| 5149 | |
| 5150 | static int selinux_getprocattr(struct task_struct *p, |
Al Viro | 04ff970 | 2007-03-12 16:17:58 +0000 | [diff] [blame] | 5151 | char *name, char **value) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5152 | { |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5153 | const struct task_security_struct *__tsec; |
Dustin Kirkland | 8c8570f | 2005-11-03 17:15:16 +0000 | [diff] [blame] | 5154 | u32 sid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5155 | int error; |
Al Viro | 04ff970 | 2007-03-12 16:17:58 +0000 | [diff] [blame] | 5156 | unsigned len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5157 | |
| 5158 | if (current != p) { |
David Howells | 3b11a1d | 2008-11-14 10:39:26 +1100 | [diff] [blame] | 5159 | error = current_has_perm(p, PROCESS__GETATTR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5160 | if (error) |
| 5161 | return error; |
| 5162 | } |
| 5163 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5164 | rcu_read_lock(); |
| 5165 | __tsec = __task_cred(p)->security; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5166 | |
| 5167 | if (!strcmp(name, "current")) |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5168 | sid = __tsec->sid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5169 | else if (!strcmp(name, "prev")) |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5170 | sid = __tsec->osid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5171 | else if (!strcmp(name, "exec")) |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5172 | sid = __tsec->exec_sid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5173 | else if (!strcmp(name, "fscreate")) |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5174 | sid = __tsec->create_sid; |
Michael LeMay | 4eb582c | 2006-06-26 00:24:57 -0700 | [diff] [blame] | 5175 | else if (!strcmp(name, "keycreate")) |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5176 | sid = __tsec->keycreate_sid; |
Eric Paris | 42c3e03 | 2006-06-26 00:26:03 -0700 | [diff] [blame] | 5177 | else if (!strcmp(name, "sockcreate")) |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5178 | sid = __tsec->sockcreate_sid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5179 | else |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5180 | goto invalid; |
| 5181 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5182 | |
| 5183 | if (!sid) |
| 5184 | return 0; |
| 5185 | |
Al Viro | 04ff970 | 2007-03-12 16:17:58 +0000 | [diff] [blame] | 5186 | error = security_sid_to_context(sid, value, &len); |
| 5187 | if (error) |
| 5188 | return error; |
| 5189 | return len; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5190 | |
| 5191 | invalid: |
| 5192 | rcu_read_unlock(); |
| 5193 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5194 | } |
| 5195 | |
| 5196 | static int selinux_setprocattr(struct task_struct *p, |
| 5197 | char *name, void *value, size_t size) |
| 5198 | { |
| 5199 | struct task_security_struct *tsec; |
Roland McGrath | 0356357 | 2008-03-26 15:46:39 -0700 | [diff] [blame] | 5200 | struct task_struct *tracer; |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 5201 | struct cred *new; |
| 5202 | u32 sid = 0, ptsid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5203 | int error; |
| 5204 | char *str = value; |
| 5205 | |
| 5206 | if (current != p) { |
| 5207 | /* SELinux only allows a process to change its own |
| 5208 | security attributes. */ |
| 5209 | return -EACCES; |
| 5210 | } |
| 5211 | |
| 5212 | /* |
| 5213 | * Basic control over ability to set these attributes at all. |
| 5214 | * current == p, but we'll pass them separately in case the |
| 5215 | * above restriction is ever removed. |
| 5216 | */ |
| 5217 | if (!strcmp(name, "exec")) |
David Howells | 3b11a1d | 2008-11-14 10:39:26 +1100 | [diff] [blame] | 5218 | error = current_has_perm(p, PROCESS__SETEXEC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5219 | else if (!strcmp(name, "fscreate")) |
David Howells | 3b11a1d | 2008-11-14 10:39:26 +1100 | [diff] [blame] | 5220 | error = current_has_perm(p, PROCESS__SETFSCREATE); |
Michael LeMay | 4eb582c | 2006-06-26 00:24:57 -0700 | [diff] [blame] | 5221 | else if (!strcmp(name, "keycreate")) |
David Howells | 3b11a1d | 2008-11-14 10:39:26 +1100 | [diff] [blame] | 5222 | error = current_has_perm(p, PROCESS__SETKEYCREATE); |
Eric Paris | 42c3e03 | 2006-06-26 00:26:03 -0700 | [diff] [blame] | 5223 | else if (!strcmp(name, "sockcreate")) |
David Howells | 3b11a1d | 2008-11-14 10:39:26 +1100 | [diff] [blame] | 5224 | error = current_has_perm(p, PROCESS__SETSOCKCREATE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5225 | else if (!strcmp(name, "current")) |
David Howells | 3b11a1d | 2008-11-14 10:39:26 +1100 | [diff] [blame] | 5226 | error = current_has_perm(p, PROCESS__SETCURRENT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5227 | else |
| 5228 | error = -EINVAL; |
| 5229 | if (error) |
| 5230 | return error; |
| 5231 | |
| 5232 | /* Obtain a SID for the context, if one was specified. */ |
| 5233 | if (size && str[1] && str[1] != '\n') { |
| 5234 | if (str[size-1] == '\n') { |
| 5235 | str[size-1] = 0; |
| 5236 | size--; |
| 5237 | } |
| 5238 | error = security_context_to_sid(value, size, &sid); |
Stephen Smalley | 12b29f3 | 2008-05-07 13:03:20 -0400 | [diff] [blame] | 5239 | if (error == -EINVAL && !strcmp(name, "fscreate")) { |
| 5240 | if (!capable(CAP_MAC_ADMIN)) |
| 5241 | return error; |
| 5242 | error = security_context_to_sid_force(value, size, |
| 5243 | &sid); |
| 5244 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5245 | if (error) |
| 5246 | return error; |
| 5247 | } |
| 5248 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 5249 | new = prepare_creds(); |
| 5250 | if (!new) |
| 5251 | return -ENOMEM; |
| 5252 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5253 | /* Permission checking based on the specified context is |
| 5254 | performed during the actual operation (execve, |
| 5255 | open/mkdir/...), when we know the full context of the |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 5256 | operation. See selinux_bprm_set_creds for the execve |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5257 | checks and may_create for the file creation checks. The |
| 5258 | operation will then fail if the context is not permitted. */ |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 5259 | tsec = new->security; |
| 5260 | if (!strcmp(name, "exec")) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5261 | tsec->exec_sid = sid; |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 5262 | } else if (!strcmp(name, "fscreate")) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5263 | tsec->create_sid = sid; |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 5264 | } else if (!strcmp(name, "keycreate")) { |
Michael LeMay | 4eb582c | 2006-06-26 00:24:57 -0700 | [diff] [blame] | 5265 | error = may_create_key(sid, p); |
| 5266 | if (error) |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 5267 | goto abort_change; |
Michael LeMay | 4eb582c | 2006-06-26 00:24:57 -0700 | [diff] [blame] | 5268 | tsec->keycreate_sid = sid; |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 5269 | } else if (!strcmp(name, "sockcreate")) { |
Eric Paris | 42c3e03 | 2006-06-26 00:26:03 -0700 | [diff] [blame] | 5270 | tsec->sockcreate_sid = sid; |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 5271 | } else if (!strcmp(name, "current")) { |
| 5272 | error = -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5273 | if (sid == 0) |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 5274 | goto abort_change; |
KaiGai Kohei | d9250de | 2008-08-28 16:35:57 +0900 | [diff] [blame] | 5275 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 5276 | /* Only allow single threaded processes to change context */ |
| 5277 | error = -EPERM; |
Oleg Nesterov | 5bb459b | 2009-07-10 03:48:23 +0200 | [diff] [blame] | 5278 | if (!current_is_single_threaded()) { |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 5279 | error = security_bounded_transition(tsec->sid, sid); |
| 5280 | if (error) |
| 5281 | goto abort_change; |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5282 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5283 | |
| 5284 | /* Check permissions for the transition. */ |
| 5285 | error = avc_has_perm(tsec->sid, sid, SECCLASS_PROCESS, |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5286 | PROCESS__DYNTRANSITION, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5287 | if (error) |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 5288 | goto abort_change; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5289 | |
| 5290 | /* Check for ptracing, and update the task SID if ok. |
| 5291 | Otherwise, leave SID unchanged and fail. */ |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 5292 | ptsid = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5293 | task_lock(p); |
Roland McGrath | 0d094ef | 2008-07-25 19:45:49 -0700 | [diff] [blame] | 5294 | tracer = tracehook_tracer_task(p); |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 5295 | if (tracer) |
| 5296 | ptsid = task_sid(tracer); |
| 5297 | task_unlock(p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5298 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 5299 | if (tracer) { |
| 5300 | error = avc_has_perm(ptsid, sid, SECCLASS_PROCESS, |
| 5301 | PROCESS__PTRACE, NULL); |
| 5302 | if (error) |
| 5303 | goto abort_change; |
| 5304 | } |
| 5305 | |
| 5306 | tsec->sid = sid; |
| 5307 | } else { |
| 5308 | error = -EINVAL; |
| 5309 | goto abort_change; |
| 5310 | } |
| 5311 | |
| 5312 | commit_creds(new); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5313 | return size; |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 5314 | |
| 5315 | abort_change: |
| 5316 | abort_creds(new); |
| 5317 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5318 | } |
| 5319 | |
Catherine Zhang | dc49c1f | 2006-08-02 14:12:06 -0700 | [diff] [blame] | 5320 | static int selinux_secid_to_secctx(u32 secid, char **secdata, u32 *seclen) |
| 5321 | { |
| 5322 | return security_sid_to_context(secid, secdata, seclen); |
| 5323 | } |
| 5324 | |
David Howells | 7bf570d | 2008-04-29 20:52:51 +0100 | [diff] [blame] | 5325 | 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] | 5326 | { |
| 5327 | return security_context_to_sid(secdata, seclen, secid); |
| 5328 | } |
| 5329 | |
Catherine Zhang | dc49c1f | 2006-08-02 14:12:06 -0700 | [diff] [blame] | 5330 | static void selinux_release_secctx(char *secdata, u32 seclen) |
| 5331 | { |
Paul Moore | 088999e | 2007-08-01 11:12:58 -0400 | [diff] [blame] | 5332 | kfree(secdata); |
Catherine Zhang | dc49c1f | 2006-08-02 14:12:06 -0700 | [diff] [blame] | 5333 | } |
| 5334 | |
David P. Quigley | 1ee65e3 | 2009-09-03 14:25:57 -0400 | [diff] [blame] | 5335 | /* |
| 5336 | * called with inode->i_mutex locked |
| 5337 | */ |
| 5338 | static int selinux_inode_notifysecctx(struct inode *inode, void *ctx, u32 ctxlen) |
| 5339 | { |
| 5340 | return selinux_inode_setsecurity(inode, XATTR_SELINUX_SUFFIX, ctx, ctxlen, 0); |
| 5341 | } |
| 5342 | |
| 5343 | /* |
| 5344 | * called with inode->i_mutex locked |
| 5345 | */ |
| 5346 | static int selinux_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen) |
| 5347 | { |
| 5348 | return __vfs_setxattr_noperm(dentry, XATTR_NAME_SELINUX, ctx, ctxlen, 0); |
| 5349 | } |
| 5350 | |
| 5351 | static int selinux_inode_getsecctx(struct inode *inode, void **ctx, u32 *ctxlen) |
| 5352 | { |
| 5353 | int len = 0; |
| 5354 | len = selinux_inode_getsecurity(inode, XATTR_SELINUX_SUFFIX, |
| 5355 | ctx, true); |
| 5356 | if (len < 0) |
| 5357 | return len; |
| 5358 | *ctxlen = len; |
| 5359 | return 0; |
| 5360 | } |
Michael LeMay | d720024 | 2006-06-22 14:47:17 -0700 | [diff] [blame] | 5361 | #ifdef CONFIG_KEYS |
| 5362 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 5363 | static int selinux_key_alloc(struct key *k, const struct cred *cred, |
David Howells | 7e047ef | 2006-06-26 00:24:50 -0700 | [diff] [blame] | 5364 | unsigned long flags) |
Michael LeMay | d720024 | 2006-06-22 14:47:17 -0700 | [diff] [blame] | 5365 | { |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 5366 | const struct task_security_struct *tsec; |
Michael LeMay | d720024 | 2006-06-22 14:47:17 -0700 | [diff] [blame] | 5367 | struct key_security_struct *ksec; |
| 5368 | |
| 5369 | ksec = kzalloc(sizeof(struct key_security_struct), GFP_KERNEL); |
| 5370 | if (!ksec) |
| 5371 | return -ENOMEM; |
| 5372 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 5373 | tsec = cred->security; |
| 5374 | if (tsec->keycreate_sid) |
| 5375 | ksec->sid = tsec->keycreate_sid; |
Michael LeMay | 4eb582c | 2006-06-26 00:24:57 -0700 | [diff] [blame] | 5376 | else |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 5377 | ksec->sid = tsec->sid; |
Michael LeMay | d720024 | 2006-06-22 14:47:17 -0700 | [diff] [blame] | 5378 | |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5379 | k->security = ksec; |
Michael LeMay | d720024 | 2006-06-22 14:47:17 -0700 | [diff] [blame] | 5380 | return 0; |
| 5381 | } |
| 5382 | |
| 5383 | static void selinux_key_free(struct key *k) |
| 5384 | { |
| 5385 | struct key_security_struct *ksec = k->security; |
| 5386 | |
| 5387 | k->security = NULL; |
| 5388 | kfree(ksec); |
| 5389 | } |
| 5390 | |
| 5391 | static int selinux_key_permission(key_ref_t key_ref, |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 5392 | const struct cred *cred, |
| 5393 | key_perm_t perm) |
Michael LeMay | d720024 | 2006-06-22 14:47:17 -0700 | [diff] [blame] | 5394 | { |
| 5395 | struct key *key; |
Michael LeMay | d720024 | 2006-06-22 14:47:17 -0700 | [diff] [blame] | 5396 | struct key_security_struct *ksec; |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5397 | u32 sid; |
Michael LeMay | d720024 | 2006-06-22 14:47:17 -0700 | [diff] [blame] | 5398 | |
| 5399 | /* if no specific permissions are requested, we skip the |
| 5400 | permission check. No serious, additional covert channels |
| 5401 | appear to be created. */ |
| 5402 | if (perm == 0) |
| 5403 | return 0; |
| 5404 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 5405 | sid = cred_sid(cred); |
David Howells | 275bb41 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 5406 | |
| 5407 | key = key_ref_to_ptr(key_ref); |
| 5408 | ksec = key->security; |
| 5409 | |
| 5410 | return avc_has_perm(sid, ksec->sid, SECCLASS_KEY, perm, NULL); |
Michael LeMay | d720024 | 2006-06-22 14:47:17 -0700 | [diff] [blame] | 5411 | } |
| 5412 | |
David Howells | 70a5bb7 | 2008-04-29 01:01:26 -0700 | [diff] [blame] | 5413 | static int selinux_key_getsecurity(struct key *key, char **_buffer) |
| 5414 | { |
| 5415 | struct key_security_struct *ksec = key->security; |
| 5416 | char *context = NULL; |
| 5417 | unsigned len; |
| 5418 | int rc; |
| 5419 | |
| 5420 | rc = security_sid_to_context(ksec->sid, &context, &len); |
| 5421 | if (!rc) |
| 5422 | rc = len; |
| 5423 | *_buffer = context; |
| 5424 | return rc; |
| 5425 | } |
| 5426 | |
Michael LeMay | d720024 | 2006-06-22 14:47:17 -0700 | [diff] [blame] | 5427 | #endif |
| 5428 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5429 | static struct security_operations selinux_ops = { |
Ahmed S. Darwish | 076c54c | 2008-03-06 18:09:10 +0200 | [diff] [blame] | 5430 | .name = "selinux", |
| 5431 | |
Ingo Molnar | 9e48858 | 2009-05-07 19:26:19 +1000 | [diff] [blame] | 5432 | .ptrace_access_check = selinux_ptrace_access_check, |
David Howells | 5cd9c58 | 2008-08-14 11:37:28 +0100 | [diff] [blame] | 5433 | .ptrace_traceme = selinux_ptrace_traceme, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5434 | .capget = selinux_capget, |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 5435 | .capset = selinux_capset, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5436 | .capable = selinux_capable, |
| 5437 | .quotactl = selinux_quotactl, |
| 5438 | .quota_on = selinux_quota_on, |
| 5439 | .syslog = selinux_syslog, |
| 5440 | .vm_enough_memory = selinux_vm_enough_memory, |
| 5441 | |
| 5442 | .netlink_send = selinux_netlink_send, |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5443 | .netlink_recv = selinux_netlink_recv, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5444 | |
David Howells | a6f76f2 | 2008-11-14 10:39:24 +1100 | [diff] [blame] | 5445 | .bprm_set_creds = selinux_bprm_set_creds, |
David Howells | a6f76f2 | 2008-11-14 10:39:24 +1100 | [diff] [blame] | 5446 | .bprm_committing_creds = selinux_bprm_committing_creds, |
| 5447 | .bprm_committed_creds = selinux_bprm_committed_creds, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5448 | .bprm_secureexec = selinux_bprm_secureexec, |
| 5449 | |
| 5450 | .sb_alloc_security = selinux_sb_alloc_security, |
| 5451 | .sb_free_security = selinux_sb_free_security, |
| 5452 | .sb_copy_data = selinux_sb_copy_data, |
Eric Paris | 026eb16 | 2011-03-03 16:09:14 -0500 | [diff] [blame] | 5453 | .sb_remount = selinux_sb_remount, |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5454 | .sb_kern_mount = selinux_sb_kern_mount, |
Eric Paris | 2069f45 | 2008-07-04 09:47:13 +1000 | [diff] [blame] | 5455 | .sb_show_options = selinux_sb_show_options, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5456 | .sb_statfs = selinux_sb_statfs, |
| 5457 | .sb_mount = selinux_mount, |
| 5458 | .sb_umount = selinux_umount, |
Eric Paris | c9180a5 | 2007-11-30 13:00:35 -0500 | [diff] [blame] | 5459 | .sb_set_mnt_opts = selinux_set_mnt_opts, |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5460 | .sb_clone_mnt_opts = selinux_sb_clone_mnt_opts, |
Eric Paris | e000752 | 2008-03-05 10:31:54 -0500 | [diff] [blame] | 5461 | .sb_parse_opts_str = selinux_parse_opts_str, |
| 5462 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5463 | |
| 5464 | .inode_alloc_security = selinux_inode_alloc_security, |
| 5465 | .inode_free_security = selinux_inode_free_security, |
Stephen Smalley | 5e41ff9 | 2005-09-09 13:01:35 -0700 | [diff] [blame] | 5466 | .inode_init_security = selinux_inode_init_security, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5467 | .inode_create = selinux_inode_create, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5468 | .inode_link = selinux_inode_link, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5469 | .inode_unlink = selinux_inode_unlink, |
| 5470 | .inode_symlink = selinux_inode_symlink, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5471 | .inode_mkdir = selinux_inode_mkdir, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5472 | .inode_rmdir = selinux_inode_rmdir, |
| 5473 | .inode_mknod = selinux_inode_mknod, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5474 | .inode_rename = selinux_inode_rename, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5475 | .inode_readlink = selinux_inode_readlink, |
| 5476 | .inode_follow_link = selinux_inode_follow_link, |
| 5477 | .inode_permission = selinux_inode_permission, |
| 5478 | .inode_setattr = selinux_inode_setattr, |
| 5479 | .inode_getattr = selinux_inode_getattr, |
| 5480 | .inode_setxattr = selinux_inode_setxattr, |
| 5481 | .inode_post_setxattr = selinux_inode_post_setxattr, |
| 5482 | .inode_getxattr = selinux_inode_getxattr, |
| 5483 | .inode_listxattr = selinux_inode_listxattr, |
| 5484 | .inode_removexattr = selinux_inode_removexattr, |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5485 | .inode_getsecurity = selinux_inode_getsecurity, |
| 5486 | .inode_setsecurity = selinux_inode_setsecurity, |
| 5487 | .inode_listsecurity = selinux_inode_listsecurity, |
Eric Paris | f526971 | 2008-05-14 11:27:45 -0400 | [diff] [blame] | 5488 | .inode_getsecid = selinux_inode_getsecid, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5489 | |
| 5490 | .file_permission = selinux_file_permission, |
| 5491 | .file_alloc_security = selinux_file_alloc_security, |
| 5492 | .file_free_security = selinux_file_free_security, |
| 5493 | .file_ioctl = selinux_file_ioctl, |
| 5494 | .file_mmap = selinux_file_mmap, |
| 5495 | .file_mprotect = selinux_file_mprotect, |
| 5496 | .file_lock = selinux_file_lock, |
| 5497 | .file_fcntl = selinux_file_fcntl, |
| 5498 | .file_set_fowner = selinux_file_set_fowner, |
| 5499 | .file_send_sigiotask = selinux_file_send_sigiotask, |
| 5500 | .file_receive = selinux_file_receive, |
| 5501 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5502 | .dentry_open = selinux_dentry_open, |
Yuichi Nakamura | 788e7dd | 2007-09-14 09:27:07 +0900 | [diff] [blame] | 5503 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5504 | .task_create = selinux_task_create, |
David Howells | ee18d64 | 2009-09-02 09:14:21 +0100 | [diff] [blame] | 5505 | .cred_alloc_blank = selinux_cred_alloc_blank, |
David Howells | f1752ee | 2008-11-14 10:39:17 +1100 | [diff] [blame] | 5506 | .cred_free = selinux_cred_free, |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 5507 | .cred_prepare = selinux_cred_prepare, |
David Howells | ee18d64 | 2009-09-02 09:14:21 +0100 | [diff] [blame] | 5508 | .cred_transfer = selinux_cred_transfer, |
David Howells | 3a3b7ce | 2008-11-14 10:39:28 +1100 | [diff] [blame] | 5509 | .kernel_act_as = selinux_kernel_act_as, |
| 5510 | .kernel_create_files_as = selinux_kernel_create_files_as, |
Eric Paris | 25354c4 | 2009-08-13 09:45:03 -0400 | [diff] [blame] | 5511 | .kernel_module_request = selinux_kernel_module_request, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5512 | .task_setpgid = selinux_task_setpgid, |
| 5513 | .task_getpgid = selinux_task_getpgid, |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5514 | .task_getsid = selinux_task_getsid, |
David Quigley | f9008e4 | 2006-06-30 01:55:46 -0700 | [diff] [blame] | 5515 | .task_getsecid = selinux_task_getsecid, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5516 | .task_setnice = selinux_task_setnice, |
James Morris | 03e6806 | 2006-06-23 02:03:58 -0700 | [diff] [blame] | 5517 | .task_setioprio = selinux_task_setioprio, |
David Quigley | a1836a4 | 2006-06-30 01:55:49 -0700 | [diff] [blame] | 5518 | .task_getioprio = selinux_task_getioprio, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5519 | .task_setrlimit = selinux_task_setrlimit, |
| 5520 | .task_setscheduler = selinux_task_setscheduler, |
| 5521 | .task_getscheduler = selinux_task_getscheduler, |
David Quigley | 3560154 | 2006-06-23 02:04:01 -0700 | [diff] [blame] | 5522 | .task_movememory = selinux_task_movememory, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5523 | .task_kill = selinux_task_kill, |
| 5524 | .task_wait = selinux_task_wait, |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5525 | .task_to_inode = selinux_task_to_inode, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5526 | |
| 5527 | .ipc_permission = selinux_ipc_permission, |
Eric Paris | f526971 | 2008-05-14 11:27:45 -0400 | [diff] [blame] | 5528 | .ipc_getsecid = selinux_ipc_getsecid, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5529 | |
| 5530 | .msg_msg_alloc_security = selinux_msg_msg_alloc_security, |
| 5531 | .msg_msg_free_security = selinux_msg_msg_free_security, |
| 5532 | |
| 5533 | .msg_queue_alloc_security = selinux_msg_queue_alloc_security, |
| 5534 | .msg_queue_free_security = selinux_msg_queue_free_security, |
| 5535 | .msg_queue_associate = selinux_msg_queue_associate, |
| 5536 | .msg_queue_msgctl = selinux_msg_queue_msgctl, |
| 5537 | .msg_queue_msgsnd = selinux_msg_queue_msgsnd, |
| 5538 | .msg_queue_msgrcv = selinux_msg_queue_msgrcv, |
| 5539 | |
| 5540 | .shm_alloc_security = selinux_shm_alloc_security, |
| 5541 | .shm_free_security = selinux_shm_free_security, |
| 5542 | .shm_associate = selinux_shm_associate, |
| 5543 | .shm_shmctl = selinux_shm_shmctl, |
| 5544 | .shm_shmat = selinux_shm_shmat, |
| 5545 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5546 | .sem_alloc_security = selinux_sem_alloc_security, |
| 5547 | .sem_free_security = selinux_sem_free_security, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5548 | .sem_associate = selinux_sem_associate, |
| 5549 | .sem_semctl = selinux_sem_semctl, |
| 5550 | .sem_semop = selinux_sem_semop, |
| 5551 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5552 | .d_instantiate = selinux_d_instantiate, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5553 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5554 | .getprocattr = selinux_getprocattr, |
| 5555 | .setprocattr = selinux_setprocattr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5556 | |
Catherine Zhang | dc49c1f | 2006-08-02 14:12:06 -0700 | [diff] [blame] | 5557 | .secid_to_secctx = selinux_secid_to_secctx, |
David Howells | 63cb344 | 2008-01-15 23:47:35 +0000 | [diff] [blame] | 5558 | .secctx_to_secid = selinux_secctx_to_secid, |
Catherine Zhang | dc49c1f | 2006-08-02 14:12:06 -0700 | [diff] [blame] | 5559 | .release_secctx = selinux_release_secctx, |
David P. Quigley | 1ee65e3 | 2009-09-03 14:25:57 -0400 | [diff] [blame] | 5560 | .inode_notifysecctx = selinux_inode_notifysecctx, |
| 5561 | .inode_setsecctx = selinux_inode_setsecctx, |
| 5562 | .inode_getsecctx = selinux_inode_getsecctx, |
Catherine Zhang | dc49c1f | 2006-08-02 14:12:06 -0700 | [diff] [blame] | 5563 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5564 | .unix_stream_connect = selinux_socket_unix_stream_connect, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5565 | .unix_may_send = selinux_socket_unix_may_send, |
| 5566 | |
| 5567 | .socket_create = selinux_socket_create, |
| 5568 | .socket_post_create = selinux_socket_post_create, |
| 5569 | .socket_bind = selinux_socket_bind, |
| 5570 | .socket_connect = selinux_socket_connect, |
| 5571 | .socket_listen = selinux_socket_listen, |
| 5572 | .socket_accept = selinux_socket_accept, |
| 5573 | .socket_sendmsg = selinux_socket_sendmsg, |
| 5574 | .socket_recvmsg = selinux_socket_recvmsg, |
| 5575 | .socket_getsockname = selinux_socket_getsockname, |
| 5576 | .socket_getpeername = selinux_socket_getpeername, |
| 5577 | .socket_getsockopt = selinux_socket_getsockopt, |
| 5578 | .socket_setsockopt = selinux_socket_setsockopt, |
| 5579 | .socket_shutdown = selinux_socket_shutdown, |
| 5580 | .socket_sock_rcv_skb = selinux_socket_sock_rcv_skb, |
Catherine Zhang | 2c7946a | 2006-03-20 22:41:23 -0800 | [diff] [blame] | 5581 | .socket_getpeersec_stream = selinux_socket_getpeersec_stream, |
| 5582 | .socket_getpeersec_dgram = selinux_socket_getpeersec_dgram, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5583 | .sk_alloc_security = selinux_sk_alloc_security, |
| 5584 | .sk_free_security = selinux_sk_free_security, |
Venkat Yekkirala | 892c141 | 2006-08-04 23:08:56 -0700 | [diff] [blame] | 5585 | .sk_clone_security = selinux_sk_clone_security, |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5586 | .sk_getsecid = selinux_sk_getsecid, |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 5587 | .sock_graft = selinux_sock_graft, |
| 5588 | .inet_conn_request = selinux_inet_conn_request, |
| 5589 | .inet_csk_clone = selinux_inet_csk_clone, |
Venkat Yekkirala | 6b87769 | 2006-11-08 17:04:09 -0600 | [diff] [blame] | 5590 | .inet_conn_established = selinux_inet_conn_established, |
Eric Paris | 2606fd1 | 2010-10-13 16:24:41 -0400 | [diff] [blame] | 5591 | .secmark_relabel_packet = selinux_secmark_relabel_packet, |
| 5592 | .secmark_refcount_inc = selinux_secmark_refcount_inc, |
| 5593 | .secmark_refcount_dec = selinux_secmark_refcount_dec, |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 5594 | .req_classify_flow = selinux_req_classify_flow, |
Paul Moore | ed6d76e | 2009-08-28 18:12:49 -0400 | [diff] [blame] | 5595 | .tun_dev_create = selinux_tun_dev_create, |
| 5596 | .tun_dev_post_create = selinux_tun_dev_post_create, |
| 5597 | .tun_dev_attach = selinux_tun_dev_attach, |
Trent Jaeger | d28d1e0 | 2005-12-13 23:12:40 -0800 | [diff] [blame] | 5598 | |
| 5599 | #ifdef CONFIG_SECURITY_NETWORK_XFRM |
| 5600 | .xfrm_policy_alloc_security = selinux_xfrm_policy_alloc, |
| 5601 | .xfrm_policy_clone_security = selinux_xfrm_policy_clone, |
| 5602 | .xfrm_policy_free_security = selinux_xfrm_policy_free, |
Catherine Zhang | c8c05a8 | 2006-06-08 23:39:49 -0700 | [diff] [blame] | 5603 | .xfrm_policy_delete_security = selinux_xfrm_policy_delete, |
Trent Jaeger | d28d1e0 | 2005-12-13 23:12:40 -0800 | [diff] [blame] | 5604 | .xfrm_state_alloc_security = selinux_xfrm_state_alloc, |
| 5605 | .xfrm_state_free_security = selinux_xfrm_state_free, |
Catherine Zhang | c8c05a8 | 2006-06-08 23:39:49 -0700 | [diff] [blame] | 5606 | .xfrm_state_delete_security = selinux_xfrm_state_delete, |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5607 | .xfrm_policy_lookup = selinux_xfrm_policy_lookup, |
Venkat Yekkirala | e0d1caa | 2006-07-24 23:29:07 -0700 | [diff] [blame] | 5608 | .xfrm_state_pol_flow_match = selinux_xfrm_state_pol_flow_match, |
Venkat Yekkirala | e0d1caa | 2006-07-24 23:29:07 -0700 | [diff] [blame] | 5609 | .xfrm_decode_session = selinux_xfrm_decode_session, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5610 | #endif |
Michael LeMay | d720024 | 2006-06-22 14:47:17 -0700 | [diff] [blame] | 5611 | |
| 5612 | #ifdef CONFIG_KEYS |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5613 | .key_alloc = selinux_key_alloc, |
| 5614 | .key_free = selinux_key_free, |
| 5615 | .key_permission = selinux_key_permission, |
David Howells | 70a5bb7 | 2008-04-29 01:01:26 -0700 | [diff] [blame] | 5616 | .key_getsecurity = selinux_key_getsecurity, |
Michael LeMay | d720024 | 2006-06-22 14:47:17 -0700 | [diff] [blame] | 5617 | #endif |
Ahmed S. Darwish | 9d57a7f | 2008-03-01 22:03:14 +0200 | [diff] [blame] | 5618 | |
| 5619 | #ifdef CONFIG_AUDIT |
| 5620 | .audit_rule_init = selinux_audit_rule_init, |
| 5621 | .audit_rule_known = selinux_audit_rule_known, |
| 5622 | .audit_rule_match = selinux_audit_rule_match, |
| 5623 | .audit_rule_free = selinux_audit_rule_free, |
| 5624 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5625 | }; |
| 5626 | |
| 5627 | static __init int selinux_init(void) |
| 5628 | { |
Ahmed S. Darwish | 076c54c | 2008-03-06 18:09:10 +0200 | [diff] [blame] | 5629 | if (!security_module_enable(&selinux_ops)) { |
| 5630 | selinux_enabled = 0; |
| 5631 | return 0; |
| 5632 | } |
| 5633 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5634 | if (!selinux_enabled) { |
| 5635 | printk(KERN_INFO "SELinux: Disabled at boot.\n"); |
| 5636 | return 0; |
| 5637 | } |
| 5638 | |
| 5639 | printk(KERN_INFO "SELinux: Initializing.\n"); |
| 5640 | |
| 5641 | /* Set the security state for the initial task. */ |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 5642 | cred_init_security(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5643 | |
Stephen Smalley | fcaaade | 2010-04-28 15:57:57 -0400 | [diff] [blame] | 5644 | default_noexec = !(VM_DATA_DEFAULT_FLAGS & VM_EXEC); |
| 5645 | |
James Morris | 7cae7e2 | 2006-03-22 00:09:22 -0800 | [diff] [blame] | 5646 | sel_inode_cache = kmem_cache_create("selinux_inode_security", |
| 5647 | sizeof(struct inode_security_struct), |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 5648 | 0, SLAB_PANIC, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5649 | avc_init(); |
| 5650 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5651 | if (register_security(&selinux_ops)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5652 | panic("SELinux: Unable to register with kernel.\n"); |
| 5653 | |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5654 | if (selinux_enforcing) |
Eric Paris | fadcdb4 | 2007-02-22 18:11:31 -0500 | [diff] [blame] | 5655 | printk(KERN_DEBUG "SELinux: Starting in enforcing mode\n"); |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5656 | else |
Eric Paris | fadcdb4 | 2007-02-22 18:11:31 -0500 | [diff] [blame] | 5657 | printk(KERN_DEBUG "SELinux: Starting in permissive mode\n"); |
Michael LeMay | d720024 | 2006-06-22 14:47:17 -0700 | [diff] [blame] | 5658 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5659 | return 0; |
| 5660 | } |
| 5661 | |
Al Viro | e8c2625 | 2010-03-23 06:36:54 -0400 | [diff] [blame] | 5662 | static void delayed_superblock_init(struct super_block *sb, void *unused) |
| 5663 | { |
| 5664 | superblock_doinit(sb, NULL); |
| 5665 | } |
| 5666 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5667 | void selinux_complete_init(void) |
| 5668 | { |
Eric Paris | fadcdb4 | 2007-02-22 18:11:31 -0500 | [diff] [blame] | 5669 | printk(KERN_DEBUG "SELinux: Completing initialization.\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5670 | |
| 5671 | /* Set up any superblocks initialized prior to the policy load. */ |
Eric Paris | fadcdb4 | 2007-02-22 18:11:31 -0500 | [diff] [blame] | 5672 | printk(KERN_DEBUG "SELinux: Setting up existing superblocks.\n"); |
Al Viro | e8c2625 | 2010-03-23 06:36:54 -0400 | [diff] [blame] | 5673 | iterate_supers(delayed_superblock_init, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5674 | } |
| 5675 | |
| 5676 | /* SELinux requires early initialization in order to label |
| 5677 | all processes and objects when they are created. */ |
| 5678 | security_initcall(selinux_init); |
| 5679 | |
Stephen Smalley | c2b507f | 2006-02-04 23:27:50 -0800 | [diff] [blame] | 5680 | #if defined(CONFIG_NETFILTER) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5681 | |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 5682 | static struct nf_hook_ops selinux_ipv4_ops[] = { |
| 5683 | { |
| 5684 | .hook = selinux_ipv4_postroute, |
| 5685 | .owner = THIS_MODULE, |
| 5686 | .pf = PF_INET, |
| 5687 | .hooknum = NF_INET_POST_ROUTING, |
| 5688 | .priority = NF_IP_PRI_SELINUX_LAST, |
| 5689 | }, |
| 5690 | { |
| 5691 | .hook = selinux_ipv4_forward, |
| 5692 | .owner = THIS_MODULE, |
| 5693 | .pf = PF_INET, |
| 5694 | .hooknum = NF_INET_FORWARD, |
| 5695 | .priority = NF_IP_PRI_SELINUX_FIRST, |
Paul Moore | 948bf85 | 2008-10-10 10:16:32 -0400 | [diff] [blame] | 5696 | }, |
| 5697 | { |
| 5698 | .hook = selinux_ipv4_output, |
| 5699 | .owner = THIS_MODULE, |
| 5700 | .pf = PF_INET, |
| 5701 | .hooknum = NF_INET_LOCAL_OUT, |
| 5702 | .priority = NF_IP_PRI_SELINUX_FIRST, |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 5703 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5704 | }; |
| 5705 | |
| 5706 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
| 5707 | |
Paul Moore | effad8d | 2008-01-29 08:49:27 -0500 | [diff] [blame] | 5708 | static struct nf_hook_ops selinux_ipv6_ops[] = { |
| 5709 | { |
| 5710 | .hook = selinux_ipv6_postroute, |
| 5711 | .owner = THIS_MODULE, |
| 5712 | .pf = PF_INET6, |
| 5713 | .hooknum = NF_INET_POST_ROUTING, |
| 5714 | .priority = NF_IP6_PRI_SELINUX_LAST, |
| 5715 | }, |
| 5716 | { |
| 5717 | .hook = selinux_ipv6_forward, |
| 5718 | .owner = THIS_MODULE, |
| 5719 | .pf = PF_INET6, |
| 5720 | .hooknum = NF_INET_FORWARD, |
| 5721 | .priority = NF_IP6_PRI_SELINUX_FIRST, |
| 5722 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5723 | }; |
| 5724 | |
| 5725 | #endif /* IPV6 */ |
| 5726 | |
| 5727 | static int __init selinux_nf_ip_init(void) |
| 5728 | { |
| 5729 | int err = 0; |
| 5730 | |
| 5731 | if (!selinux_enabled) |
| 5732 | goto out; |
Eric Paris | fadcdb4 | 2007-02-22 18:11:31 -0500 | [diff] [blame] | 5733 | |
| 5734 | printk(KERN_DEBUG "SELinux: Registering netfilter hooks\n"); |
| 5735 | |
Alexey Dobriyan | 6c5a9d2 | 2008-07-26 17:48:15 -0700 | [diff] [blame] | 5736 | err = nf_register_hooks(selinux_ipv4_ops, ARRAY_SIZE(selinux_ipv4_ops)); |
| 5737 | if (err) |
| 5738 | panic("SELinux: nf_register_hooks for IPv4: error %d\n", err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5739 | |
| 5740 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
Alexey Dobriyan | 6c5a9d2 | 2008-07-26 17:48:15 -0700 | [diff] [blame] | 5741 | err = nf_register_hooks(selinux_ipv6_ops, ARRAY_SIZE(selinux_ipv6_ops)); |
| 5742 | if (err) |
| 5743 | panic("SELinux: nf_register_hooks for IPv6: error %d\n", err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5744 | #endif /* IPV6 */ |
Trent Jaeger | d28d1e0 | 2005-12-13 23:12:40 -0800 | [diff] [blame] | 5745 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5746 | out: |
| 5747 | return err; |
| 5748 | } |
| 5749 | |
| 5750 | __initcall(selinux_nf_ip_init); |
| 5751 | |
| 5752 | #ifdef CONFIG_SECURITY_SELINUX_DISABLE |
| 5753 | static void selinux_nf_ip_exit(void) |
| 5754 | { |
Eric Paris | fadcdb4 | 2007-02-22 18:11:31 -0500 | [diff] [blame] | 5755 | printk(KERN_DEBUG "SELinux: Unregistering netfilter hooks\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5756 | |
Alexey Dobriyan | 6c5a9d2 | 2008-07-26 17:48:15 -0700 | [diff] [blame] | 5757 | nf_unregister_hooks(selinux_ipv4_ops, ARRAY_SIZE(selinux_ipv4_ops)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5758 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
Alexey Dobriyan | 6c5a9d2 | 2008-07-26 17:48:15 -0700 | [diff] [blame] | 5759 | nf_unregister_hooks(selinux_ipv6_ops, ARRAY_SIZE(selinux_ipv6_ops)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5760 | #endif /* IPV6 */ |
| 5761 | } |
| 5762 | #endif |
| 5763 | |
Stephen Smalley | c2b507f | 2006-02-04 23:27:50 -0800 | [diff] [blame] | 5764 | #else /* CONFIG_NETFILTER */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5765 | |
| 5766 | #ifdef CONFIG_SECURITY_SELINUX_DISABLE |
| 5767 | #define selinux_nf_ip_exit() |
| 5768 | #endif |
| 5769 | |
Stephen Smalley | c2b507f | 2006-02-04 23:27:50 -0800 | [diff] [blame] | 5770 | #endif /* CONFIG_NETFILTER */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5771 | |
| 5772 | #ifdef CONFIG_SECURITY_SELINUX_DISABLE |
Eric Paris | 828dfe1 | 2008-04-17 13:17:49 -0400 | [diff] [blame] | 5773 | static int selinux_disabled; |
| 5774 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5775 | int selinux_disable(void) |
| 5776 | { |
| 5777 | extern void exit_sel_fs(void); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5778 | |
| 5779 | if (ss_initialized) { |
| 5780 | /* Not permitted after initial policy load. */ |
| 5781 | return -EINVAL; |
| 5782 | } |
| 5783 | |
| 5784 | if (selinux_disabled) { |
| 5785 | /* Only do this once. */ |
| 5786 | return -EINVAL; |
| 5787 | } |
| 5788 | |
| 5789 | printk(KERN_INFO "SELinux: Disabled at runtime.\n"); |
| 5790 | |
| 5791 | selinux_disabled = 1; |
Stephen Smalley | 30d5528 | 2006-05-03 10:52:36 -0400 | [diff] [blame] | 5792 | selinux_enabled = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5793 | |
wzt.wzt@gmail.com | 189b3b1 | 2010-02-23 23:15:28 +0800 | [diff] [blame] | 5794 | reset_security_ops(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5795 | |
Eric Paris | af8ff04 | 2009-09-20 21:23:01 -0400 | [diff] [blame] | 5796 | /* Try to destroy the avc node cache */ |
| 5797 | avc_disable(); |
| 5798 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5799 | /* Unregister netfilter hooks. */ |
| 5800 | selinux_nf_ip_exit(); |
| 5801 | |
| 5802 | /* Unregister selinuxfs. */ |
| 5803 | exit_sel_fs(); |
| 5804 | |
| 5805 | return 0; |
| 5806 | } |
| 5807 | #endif |