blob: d6f64783acd14455b7d02455e8bd744cb555d871 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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 Paris828dfe12008-04-17 13:17:49 -04007 * Chris Vance, <cvance@nai.com>
8 * Wayne Salamon, <wsalamon@nai.com>
9 * James Morris <jmorris@redhat.com>
Linus Torvalds1da177e2005-04-16 15:20:36 -070010 *
11 * Copyright (C) 2001,2002 Networks Associates Technology, Inc.
Eric Paris2069f452008-07-04 09:47:13 +100012 * Copyright (C) 2003-2008 Red Hat, Inc., James Morris <jmorris@redhat.com>
13 * Eric Paris <eparis@redhat.com>
Linus Torvalds1da177e2005-04-16 15:20:36 -070014 * Copyright (C) 2004-2005 Trusted Computer Solutions, Inc.
Eric Paris828dfe12008-04-17 13:17:49 -040015 * <dgoeddel@trustedcs.com>
Paul Mooreeffad8d2008-01-29 08:49:27 -050016 * Copyright (C) 2006, 2007 Hewlett-Packard Development Company, L.P.
Eric Paris828dfe12008-04-17 13:17:49 -040017 * Paul Moore <paul.moore@hp.com>
Yuichi Nakamura788e7dd2007-09-14 09:27:07 +090018 * Copyright (C) 2007 Hitachi Software Engineering Co., Ltd.
Eric Paris828dfe12008-04-17 13:17:49 -040019 * Yuichi Nakamura <ynakam@hitachisoft.jp>
Linus Torvalds1da177e2005-04-16 15:20:36 -070020 *
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 Paris828dfe12008-04-17 13:17:49 -040023 * as published by the Free Software Foundation.
Linus Torvalds1da177e2005-04-16 15:20:36 -070024 */
25
Linus Torvalds1da177e2005-04-16 15:20:36 -070026#include <linux/init.h>
27#include <linux/kernel.h>
Roland McGrath0d094ef2008-07-25 19:45:49 -070028#include <linux/tracehook.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070029#include <linux/errno.h>
30#include <linux/sched.h>
31#include <linux/security.h>
32#include <linux/xattr.h>
33#include <linux/capability.h>
34#include <linux/unistd.h>
35#include <linux/mm.h>
36#include <linux/mman.h>
37#include <linux/slab.h>
38#include <linux/pagemap.h>
39#include <linux/swap.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070040#include <linux/spinlock.h>
41#include <linux/syscalls.h>
42#include <linux/file.h>
Al Viro9f3acc32008-04-24 07:44:08 -040043#include <linux/fdtable.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070044#include <linux/namei.h>
45#include <linux/mount.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070046#include <linux/proc_fs.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070047#include <linux/netfilter_ipv4.h>
48#include <linux/netfilter_ipv6.h>
49#include <linux/tty.h>
50#include <net/icmp.h>
Stephen Hemminger227b60f2007-10-10 17:30:46 -070051#include <net/ip.h> /* for local_port_range[] */
Linus Torvalds1da177e2005-04-16 15:20:36 -070052#include <net/tcp.h> /* struct or_callable used in sock_rcv_skb */
Paul Moore220deb92008-01-29 08:38:23 -050053#include <net/net_namespace.h>
Paul Moored621d352008-01-29 08:43:36 -050054#include <net/netlabel.h>
Eric Parisf5269712008-05-14 11:27:45 -040055#include <linux/uaccess.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070056#include <asm/ioctls.h>
Paul Moored621d352008-01-29 08:43:36 -050057#include <asm/atomic.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070058#include <linux/bitops.h>
59#include <linux/interrupt.h>
60#include <linux/netdevice.h> /* for network interface checks */
61#include <linux/netlink.h>
62#include <linux/tcp.h>
63#include <linux/udp.h>
James Morris2ee92d42006-11-13 16:09:01 -080064#include <linux/dccp.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070065#include <linux/quota.h>
66#include <linux/un.h> /* for Unix socket types */
67#include <net/af_unix.h> /* for Unix socket types */
68#include <linux/parser.h>
69#include <linux/nfs_mount.h>
70#include <net/ipv6.h>
71#include <linux/hugetlb.h>
72#include <linux/personality.h>
73#include <linux/sysctl.h>
74#include <linux/audit.h>
Eric Paris6931dfc2005-06-30 02:58:51 -070075#include <linux/string.h>
Catherine Zhang877ce7c2006-06-29 12:27:47 -070076#include <linux/selinux.h>
Eric Paris23970742006-09-25 23:32:01 -070077#include <linux/mutex.h>
Frank Mayharf06febc2008-09-12 09:54:39 -070078#include <linux/posix-timers.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070079
80#include "avc.h"
81#include "objsec.h"
82#include "netif.h"
Paul Moore224dfbd2008-01-29 08:38:13 -050083#include "netnode.h"
Paul Moore3e112172008-04-10 10:48:14 -040084#include "netport.h"
Trent Jaegerd28d1e02005-12-13 23:12:40 -080085#include "xfrm.h"
Paul Moorec60475b2007-02-28 15:14:23 -050086#include "netlabel.h"
Ahmed S. Darwish9d57a7f2008-03-01 22:03:14 +020087#include "audit.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070088
89#define XATTR_SELINUX_SUFFIX "selinux"
90#define XATTR_NAME_SELINUX XATTR_SECURITY_PREFIX XATTR_SELINUX_SUFFIX
91
David P. Quigley11689d42009-01-16 09:22:03 -050092#define NUM_SEL_MNT_OPTS 5
Eric Parisc9180a52007-11-30 13:00:35 -050093
Linus Torvalds1da177e2005-04-16 15:20:36 -070094extern unsigned int policydb_loaded_version;
95extern int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm);
James Morris20510f22007-10-16 23:31:32 -070096extern struct security_operations *security_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -070097
Paul Moored621d352008-01-29 08:43:36 -050098/* SECMARK reference count */
99atomic_t selinux_secmark_refcount = ATOMIC_INIT(0);
100
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101#ifdef CONFIG_SECURITY_SELINUX_DEVELOP
Eric Paris828dfe12008-04-17 13:17:49 -0400102int selinux_enforcing;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103
104static int __init enforcing_setup(char *str)
105{
Eric Parisf5269712008-05-14 11:27:45 -0400106 unsigned long enforcing;
107 if (!strict_strtoul(str, 0, &enforcing))
108 selinux_enforcing = enforcing ? 1 : 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109 return 1;
110}
111__setup("enforcing=", enforcing_setup);
112#endif
113
114#ifdef CONFIG_SECURITY_SELINUX_BOOTPARAM
115int selinux_enabled = CONFIG_SECURITY_SELINUX_BOOTPARAM_VALUE;
116
117static int __init selinux_enabled_setup(char *str)
118{
Eric Parisf5269712008-05-14 11:27:45 -0400119 unsigned long enabled;
120 if (!strict_strtoul(str, 0, &enabled))
121 selinux_enabled = enabled ? 1 : 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122 return 1;
123}
124__setup("selinux=", selinux_enabled_setup);
Stephen Smalley30d55282006-05-03 10:52:36 -0400125#else
126int selinux_enabled = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127#endif
128
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129
James Morris6f0f0fd2008-07-10 17:02:07 +0900130/*
131 * Minimal support for a secondary security module,
132 * just to allow the use of the capability module.
133 */
Eric Paris828dfe12008-04-17 13:17:49 -0400134static struct security_operations *secondary_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135
136/* Lists of inode and superblock security structures initialized
137 before the policy was loaded. */
138static LIST_HEAD(superblock_security_head);
139static DEFINE_SPINLOCK(sb_security_lock);
140
Christoph Lametere18b8902006-12-06 20:33:20 -0800141static struct kmem_cache *sel_inode_cache;
James Morris7cae7e22006-03-22 00:09:22 -0800142
Paul Moored621d352008-01-29 08:43:36 -0500143/**
144 * selinux_secmark_enabled - Check to see if SECMARK is currently enabled
145 *
146 * Description:
147 * This function checks the SECMARK reference counter to see if any SECMARK
148 * targets are currently configured, if the reference counter is greater than
149 * zero SECMARK is considered to be enabled. Returns true (1) if SECMARK is
150 * enabled, false (0) if SECMARK is disabled.
151 *
152 */
153static int selinux_secmark_enabled(void)
154{
155 return (atomic_read(&selinux_secmark_refcount) > 0);
156}
157
David Howellsd84f4f92008-11-14 10:39:23 +1100158/*
159 * initialise the security for the init task
160 */
161static void cred_init_security(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162{
David Howells3b11a1d2008-11-14 10:39:26 +1100163 struct cred *cred = (struct cred *) current->real_cred;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164 struct task_security_struct *tsec;
165
James Morris89d155e2005-10-30 14:59:21 -0800166 tsec = kzalloc(sizeof(struct task_security_struct), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167 if (!tsec)
David Howellsd84f4f92008-11-14 10:39:23 +1100168 panic("SELinux: Failed to initialize initial task.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169
David Howellsd84f4f92008-11-14 10:39:23 +1100170 tsec->osid = tsec->sid = SECINITSID_KERNEL;
David Howellsf1752ee2008-11-14 10:39:17 +1100171 cred->security = tsec;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172}
173
David Howells275bb412008-11-14 10:39:19 +1100174/*
David Howells88e67f32008-11-14 10:39:21 +1100175 * get the security ID of a set of credentials
176 */
177static inline u32 cred_sid(const struct cred *cred)
178{
179 const struct task_security_struct *tsec;
180
181 tsec = cred->security;
182 return tsec->sid;
183}
184
185/*
David Howells3b11a1d2008-11-14 10:39:26 +1100186 * get the objective security ID of a task
David Howells275bb412008-11-14 10:39:19 +1100187 */
188static inline u32 task_sid(const struct task_struct *task)
189{
David Howells275bb412008-11-14 10:39:19 +1100190 u32 sid;
191
192 rcu_read_lock();
David Howells88e67f32008-11-14 10:39:21 +1100193 sid = cred_sid(__task_cred(task));
David Howells275bb412008-11-14 10:39:19 +1100194 rcu_read_unlock();
195 return sid;
196}
197
198/*
David Howells3b11a1d2008-11-14 10:39:26 +1100199 * get the subjective security ID of the current task
David Howells275bb412008-11-14 10:39:19 +1100200 */
201static inline u32 current_sid(void)
202{
203 const struct task_security_struct *tsec = current_cred()->security;
204
205 return tsec->sid;
206}
207
David Howells88e67f32008-11-14 10:39:21 +1100208/* Allocate and free functions for each kind of security blob. */
209
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210static int inode_alloc_security(struct inode *inode)
211{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212 struct inode_security_struct *isec;
David Howells275bb412008-11-14 10:39:19 +1100213 u32 sid = current_sid();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214
Josef Bacika02fe132008-04-04 09:35:05 +1100215 isec = kmem_cache_zalloc(sel_inode_cache, GFP_NOFS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216 if (!isec)
217 return -ENOMEM;
218
Eric Paris23970742006-09-25 23:32:01 -0700219 mutex_init(&isec->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220 INIT_LIST_HEAD(&isec->list);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221 isec->inode = inode;
222 isec->sid = SECINITSID_UNLABELED;
223 isec->sclass = SECCLASS_FILE;
David Howells275bb412008-11-14 10:39:19 +1100224 isec->task_sid = sid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225 inode->i_security = isec;
226
227 return 0;
228}
229
230static void inode_free_security(struct inode *inode)
231{
232 struct inode_security_struct *isec = inode->i_security;
233 struct superblock_security_struct *sbsec = inode->i_sb->s_security;
234
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235 spin_lock(&sbsec->isec_lock);
236 if (!list_empty(&isec->list))
237 list_del_init(&isec->list);
238 spin_unlock(&sbsec->isec_lock);
239
240 inode->i_security = NULL;
James Morris7cae7e22006-03-22 00:09:22 -0800241 kmem_cache_free(sel_inode_cache, isec);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242}
243
244static int file_alloc_security(struct file *file)
245{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246 struct file_security_struct *fsec;
David Howells275bb412008-11-14 10:39:19 +1100247 u32 sid = current_sid();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248
Stephen Smalley26d2a4b2006-02-01 03:05:55 -0800249 fsec = kzalloc(sizeof(struct file_security_struct), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250 if (!fsec)
251 return -ENOMEM;
252
David Howells275bb412008-11-14 10:39:19 +1100253 fsec->sid = sid;
254 fsec->fown_sid = sid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255 file->f_security = fsec;
256
257 return 0;
258}
259
260static void file_free_security(struct file *file)
261{
262 struct file_security_struct *fsec = file->f_security;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263 file->f_security = NULL;
264 kfree(fsec);
265}
266
267static int superblock_alloc_security(struct super_block *sb)
268{
269 struct superblock_security_struct *sbsec;
270
James Morris89d155e2005-10-30 14:59:21 -0800271 sbsec = kzalloc(sizeof(struct superblock_security_struct), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272 if (!sbsec)
273 return -ENOMEM;
274
Eric Parisbc7e9822006-09-25 23:32:02 -0700275 mutex_init(&sbsec->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276 INIT_LIST_HEAD(&sbsec->list);
277 INIT_LIST_HEAD(&sbsec->isec_head);
278 spin_lock_init(&sbsec->isec_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279 sbsec->sb = sb;
280 sbsec->sid = SECINITSID_UNLABELED;
281 sbsec->def_sid = SECINITSID_FILE;
Eric Parisc312feb2006-07-10 04:43:53 -0700282 sbsec->mntpoint_sid = SECINITSID_UNLABELED;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283 sb->s_security = sbsec;
284
285 return 0;
286}
287
288static void superblock_free_security(struct super_block *sb)
289{
290 struct superblock_security_struct *sbsec = sb->s_security;
291
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292 spin_lock(&sb_security_lock);
293 if (!list_empty(&sbsec->list))
294 list_del_init(&sbsec->list);
295 spin_unlock(&sb_security_lock);
296
297 sb->s_security = NULL;
298 kfree(sbsec);
299}
300
Al Viro7d877f32005-10-21 03:20:43 -0400301static int sk_alloc_security(struct sock *sk, int family, gfp_t priority)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302{
303 struct sk_security_struct *ssec;
304
James Morris89d155e2005-10-30 14:59:21 -0800305 ssec = kzalloc(sizeof(*ssec), priority);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306 if (!ssec)
307 return -ENOMEM;
308
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309 ssec->peer_sid = SECINITSID_UNLABELED;
Venkat Yekkirala892c1412006-08-04 23:08:56 -0700310 ssec->sid = SECINITSID_UNLABELED;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311 sk->sk_security = ssec;
312
Paul Moore389fb8002009-03-27 17:10:34 -0400313 selinux_netlbl_sk_security_reset(ssec);
Paul Moore99f59ed2006-08-29 17:53:48 -0700314
Linus Torvalds1da177e2005-04-16 15:20:36 -0700315 return 0;
316}
317
318static void sk_free_security(struct sock *sk)
319{
320 struct sk_security_struct *ssec = sk->sk_security;
321
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322 sk->sk_security = NULL;
Paul Moore6c5b3fc2008-10-10 10:16:33 -0400323 selinux_netlbl_sk_security_free(ssec);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324 kfree(ssec);
325}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326
327/* The security server must be initialized before
328 any labeling or access decisions can be provided. */
329extern int ss_initialized;
330
331/* The file system's label must be initialized prior to use. */
332
333static char *labeling_behaviors[6] = {
334 "uses xattr",
335 "uses transition SIDs",
336 "uses task SIDs",
337 "uses genfs_contexts",
338 "not configured for labeling",
339 "uses mountpoint labeling",
340};
341
342static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dentry);
343
344static inline int inode_doinit(struct inode *inode)
345{
346 return inode_doinit_with_dentry(inode, NULL);
347}
348
349enum {
Eric Paris31e87932007-09-19 17:19:12 -0400350 Opt_error = -1,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351 Opt_context = 1,
352 Opt_fscontext = 2,
Eric Parisc9180a52007-11-30 13:00:35 -0500353 Opt_defcontext = 3,
354 Opt_rootcontext = 4,
David P. Quigley11689d42009-01-16 09:22:03 -0500355 Opt_labelsupport = 5,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356};
357
Steven Whitehousea447c092008-10-13 10:46:57 +0100358static const match_table_t tokens = {
Eric Paris832cbd92008-04-01 13:24:09 -0400359 {Opt_context, CONTEXT_STR "%s"},
360 {Opt_fscontext, FSCONTEXT_STR "%s"},
361 {Opt_defcontext, DEFCONTEXT_STR "%s"},
362 {Opt_rootcontext, ROOTCONTEXT_STR "%s"},
David P. Quigley11689d42009-01-16 09:22:03 -0500363 {Opt_labelsupport, LABELSUPP_STR},
Eric Paris31e87932007-09-19 17:19:12 -0400364 {Opt_error, NULL},
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365};
366
367#define SEL_MOUNT_FAIL_MSG "SELinux: duplicate or incompatible mount options\n"
368
Eric Parisc312feb2006-07-10 04:43:53 -0700369static int may_context_mount_sb_relabel(u32 sid,
370 struct superblock_security_struct *sbsec,
David Howells275bb412008-11-14 10:39:19 +1100371 const struct cred *cred)
Eric Parisc312feb2006-07-10 04:43:53 -0700372{
David Howells275bb412008-11-14 10:39:19 +1100373 const struct task_security_struct *tsec = cred->security;
Eric Parisc312feb2006-07-10 04:43:53 -0700374 int rc;
375
376 rc = avc_has_perm(tsec->sid, sbsec->sid, SECCLASS_FILESYSTEM,
377 FILESYSTEM__RELABELFROM, NULL);
378 if (rc)
379 return rc;
380
381 rc = avc_has_perm(tsec->sid, sid, SECCLASS_FILESYSTEM,
382 FILESYSTEM__RELABELTO, NULL);
383 return rc;
384}
385
Eric Paris08089252006-07-10 04:43:55 -0700386static int may_context_mount_inode_relabel(u32 sid,
387 struct superblock_security_struct *sbsec,
David Howells275bb412008-11-14 10:39:19 +1100388 const struct cred *cred)
Eric Paris08089252006-07-10 04:43:55 -0700389{
David Howells275bb412008-11-14 10:39:19 +1100390 const struct task_security_struct *tsec = cred->security;
Eric Paris08089252006-07-10 04:43:55 -0700391 int rc;
392 rc = avc_has_perm(tsec->sid, sbsec->sid, SECCLASS_FILESYSTEM,
393 FILESYSTEM__RELABELFROM, NULL);
394 if (rc)
395 return rc;
396
397 rc = avc_has_perm(sid, sbsec->sid, SECCLASS_FILESYSTEM,
398 FILESYSTEM__ASSOCIATE, NULL);
399 return rc;
400}
401
Eric Parisc9180a52007-11-30 13:00:35 -0500402static int sb_finish_set_opts(struct super_block *sb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700403{
404 struct superblock_security_struct *sbsec = sb->s_security;
405 struct dentry *root = sb->s_root;
Eric Parisc9180a52007-11-30 13:00:35 -0500406 struct inode *root_inode = root->d_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700407 int rc = 0;
408
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409 if (sbsec->behavior == SECURITY_FS_USE_XATTR) {
410 /* Make sure that the xattr handler exists and that no
411 error other than -ENODATA is returned by getxattr on
412 the root directory. -ENODATA is ok, as this may be
413 the first boot of the SELinux kernel before we have
414 assigned xattr values to the filesystem. */
Eric Parisc9180a52007-11-30 13:00:35 -0500415 if (!root_inode->i_op->getxattr) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700416 printk(KERN_WARNING "SELinux: (dev %s, type %s) has no "
417 "xattr support\n", sb->s_id, sb->s_type->name);
418 rc = -EOPNOTSUPP;
419 goto out;
420 }
Eric Parisc9180a52007-11-30 13:00:35 -0500421 rc = root_inode->i_op->getxattr(root, XATTR_NAME_SELINUX, NULL, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422 if (rc < 0 && rc != -ENODATA) {
423 if (rc == -EOPNOTSUPP)
424 printk(KERN_WARNING "SELinux: (dev %s, type "
425 "%s) has no security xattr handler\n",
426 sb->s_id, sb->s_type->name);
427 else
428 printk(KERN_WARNING "SELinux: (dev %s, type "
429 "%s) getxattr errno %d\n", sb->s_id,
430 sb->s_type->name, -rc);
431 goto out;
432 }
433 }
434
David P. Quigley11689d42009-01-16 09:22:03 -0500435 sbsec->flags |= (SE_SBINITIALIZED | SE_SBLABELSUPP);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700436
Eric Parisc9180a52007-11-30 13:00:35 -0500437 if (sbsec->behavior > ARRAY_SIZE(labeling_behaviors))
Eric Parisfadcdb42007-02-22 18:11:31 -0500438 printk(KERN_ERR "SELinux: initialized (dev %s, type %s), unknown behavior\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439 sb->s_id, sb->s_type->name);
Eric Parisc9180a52007-11-30 13:00:35 -0500440 else
Eric Parisfadcdb42007-02-22 18:11:31 -0500441 printk(KERN_DEBUG "SELinux: initialized (dev %s, type %s), %s\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700442 sb->s_id, sb->s_type->name,
443 labeling_behaviors[sbsec->behavior-1]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700444
David P. Quigley11689d42009-01-16 09:22:03 -0500445 if (sbsec->behavior == SECURITY_FS_USE_GENFS ||
446 sbsec->behavior == SECURITY_FS_USE_MNTPOINT ||
447 sbsec->behavior == SECURITY_FS_USE_NONE ||
448 sbsec->behavior > ARRAY_SIZE(labeling_behaviors))
449 sbsec->flags &= ~SE_SBLABELSUPP;
450
Linus Torvalds1da177e2005-04-16 15:20:36 -0700451 /* Initialize the root inode. */
Eric Parisc9180a52007-11-30 13:00:35 -0500452 rc = inode_doinit_with_dentry(root_inode, root);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453
454 /* Initialize any other inodes associated with the superblock, e.g.
455 inodes created prior to initial policy load or inodes created
456 during get_sb by a pseudo filesystem that directly
457 populates itself. */
458 spin_lock(&sbsec->isec_lock);
459next_inode:
460 if (!list_empty(&sbsec->isec_head)) {
461 struct inode_security_struct *isec =
462 list_entry(sbsec->isec_head.next,
Eric Parisc9180a52007-11-30 13:00:35 -0500463 struct inode_security_struct, list);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464 struct inode *inode = isec->inode;
465 spin_unlock(&sbsec->isec_lock);
466 inode = igrab(inode);
467 if (inode) {
Eric Parisc9180a52007-11-30 13:00:35 -0500468 if (!IS_PRIVATE(inode))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469 inode_doinit(inode);
470 iput(inode);
471 }
472 spin_lock(&sbsec->isec_lock);
473 list_del_init(&isec->list);
474 goto next_inode;
475 }
476 spin_unlock(&sbsec->isec_lock);
477out:
Eric Parisc9180a52007-11-30 13:00:35 -0500478 return rc;
479}
480
481/*
482 * This function should allow an FS to ask what it's mount security
483 * options were so it can use those later for submounts, displaying
484 * mount options, or whatever.
485 */
486static int selinux_get_mnt_opts(const struct super_block *sb,
Eric Parise0007522008-03-05 10:31:54 -0500487 struct security_mnt_opts *opts)
Eric Parisc9180a52007-11-30 13:00:35 -0500488{
489 int rc = 0, i;
490 struct superblock_security_struct *sbsec = sb->s_security;
491 char *context = NULL;
492 u32 len;
493 char tmp;
494
Eric Parise0007522008-03-05 10:31:54 -0500495 security_init_mnt_opts(opts);
Eric Parisc9180a52007-11-30 13:00:35 -0500496
David P. Quigley0d90a7e2009-01-16 09:22:02 -0500497 if (!(sbsec->flags & SE_SBINITIALIZED))
Eric Parisc9180a52007-11-30 13:00:35 -0500498 return -EINVAL;
499
500 if (!ss_initialized)
501 return -EINVAL;
502
David P. Quigley0d90a7e2009-01-16 09:22:02 -0500503 tmp = sbsec->flags & SE_MNTMASK;
Eric Parisc9180a52007-11-30 13:00:35 -0500504 /* count the number of mount options for this sb */
505 for (i = 0; i < 8; i++) {
506 if (tmp & 0x01)
Eric Parise0007522008-03-05 10:31:54 -0500507 opts->num_mnt_opts++;
Eric Parisc9180a52007-11-30 13:00:35 -0500508 tmp >>= 1;
509 }
David P. Quigley11689d42009-01-16 09:22:03 -0500510 /* Check if the Label support flag is set */
511 if (sbsec->flags & SE_SBLABELSUPP)
512 opts->num_mnt_opts++;
Eric Parisc9180a52007-11-30 13:00:35 -0500513
Eric Parise0007522008-03-05 10:31:54 -0500514 opts->mnt_opts = kcalloc(opts->num_mnt_opts, sizeof(char *), GFP_ATOMIC);
515 if (!opts->mnt_opts) {
Eric Parisc9180a52007-11-30 13:00:35 -0500516 rc = -ENOMEM;
517 goto out_free;
518 }
519
Eric Parise0007522008-03-05 10:31:54 -0500520 opts->mnt_opts_flags = kcalloc(opts->num_mnt_opts, sizeof(int), GFP_ATOMIC);
521 if (!opts->mnt_opts_flags) {
Eric Parisc9180a52007-11-30 13:00:35 -0500522 rc = -ENOMEM;
523 goto out_free;
524 }
525
526 i = 0;
527 if (sbsec->flags & FSCONTEXT_MNT) {
528 rc = security_sid_to_context(sbsec->sid, &context, &len);
529 if (rc)
530 goto out_free;
Eric Parise0007522008-03-05 10:31:54 -0500531 opts->mnt_opts[i] = context;
532 opts->mnt_opts_flags[i++] = FSCONTEXT_MNT;
Eric Parisc9180a52007-11-30 13:00:35 -0500533 }
534 if (sbsec->flags & CONTEXT_MNT) {
535 rc = security_sid_to_context(sbsec->mntpoint_sid, &context, &len);
536 if (rc)
537 goto out_free;
Eric Parise0007522008-03-05 10:31:54 -0500538 opts->mnt_opts[i] = context;
539 opts->mnt_opts_flags[i++] = CONTEXT_MNT;
Eric Parisc9180a52007-11-30 13:00:35 -0500540 }
541 if (sbsec->flags & DEFCONTEXT_MNT) {
542 rc = security_sid_to_context(sbsec->def_sid, &context, &len);
543 if (rc)
544 goto out_free;
Eric Parise0007522008-03-05 10:31:54 -0500545 opts->mnt_opts[i] = context;
546 opts->mnt_opts_flags[i++] = DEFCONTEXT_MNT;
Eric Parisc9180a52007-11-30 13:00:35 -0500547 }
548 if (sbsec->flags & ROOTCONTEXT_MNT) {
549 struct inode *root = sbsec->sb->s_root->d_inode;
550 struct inode_security_struct *isec = root->i_security;
551
552 rc = security_sid_to_context(isec->sid, &context, &len);
553 if (rc)
554 goto out_free;
Eric Parise0007522008-03-05 10:31:54 -0500555 opts->mnt_opts[i] = context;
556 opts->mnt_opts_flags[i++] = ROOTCONTEXT_MNT;
Eric Parisc9180a52007-11-30 13:00:35 -0500557 }
David P. Quigley11689d42009-01-16 09:22:03 -0500558 if (sbsec->flags & SE_SBLABELSUPP) {
559 opts->mnt_opts[i] = NULL;
560 opts->mnt_opts_flags[i++] = SE_SBLABELSUPP;
561 }
Eric Parisc9180a52007-11-30 13:00:35 -0500562
Eric Parise0007522008-03-05 10:31:54 -0500563 BUG_ON(i != opts->num_mnt_opts);
Eric Parisc9180a52007-11-30 13:00:35 -0500564
565 return 0;
566
567out_free:
Eric Parise0007522008-03-05 10:31:54 -0500568 security_free_mnt_opts(opts);
Eric Parisc9180a52007-11-30 13:00:35 -0500569 return rc;
570}
571
572static int bad_option(struct superblock_security_struct *sbsec, char flag,
573 u32 old_sid, u32 new_sid)
574{
David P. Quigley0d90a7e2009-01-16 09:22:02 -0500575 char mnt_flags = sbsec->flags & SE_MNTMASK;
576
Eric Parisc9180a52007-11-30 13:00:35 -0500577 /* check if the old mount command had the same options */
David P. Quigley0d90a7e2009-01-16 09:22:02 -0500578 if (sbsec->flags & SE_SBINITIALIZED)
Eric Parisc9180a52007-11-30 13:00:35 -0500579 if (!(sbsec->flags & flag) ||
580 (old_sid != new_sid))
581 return 1;
582
583 /* check if we were passed the same options twice,
584 * aka someone passed context=a,context=b
585 */
David P. Quigley0d90a7e2009-01-16 09:22:02 -0500586 if (!(sbsec->flags & SE_SBINITIALIZED))
587 if (mnt_flags & flag)
Eric Parisc9180a52007-11-30 13:00:35 -0500588 return 1;
589 return 0;
590}
Eric Parise0007522008-03-05 10:31:54 -0500591
Eric Parisc9180a52007-11-30 13:00:35 -0500592/*
593 * Allow filesystems with binary mount data to explicitly set mount point
594 * labeling information.
595 */
Eric Parise0007522008-03-05 10:31:54 -0500596static int selinux_set_mnt_opts(struct super_block *sb,
597 struct security_mnt_opts *opts)
Eric Parisc9180a52007-11-30 13:00:35 -0500598{
David Howells275bb412008-11-14 10:39:19 +1100599 const struct cred *cred = current_cred();
Eric Parisc9180a52007-11-30 13:00:35 -0500600 int rc = 0, i;
Eric Parisc9180a52007-11-30 13:00:35 -0500601 struct superblock_security_struct *sbsec = sb->s_security;
602 const char *name = sb->s_type->name;
James Morris089be432008-07-15 18:32:49 +1000603 struct inode *inode = sbsec->sb->s_root->d_inode;
604 struct inode_security_struct *root_isec = inode->i_security;
Eric Parisc9180a52007-11-30 13:00:35 -0500605 u32 fscontext_sid = 0, context_sid = 0, rootcontext_sid = 0;
606 u32 defcontext_sid = 0;
Eric Parise0007522008-03-05 10:31:54 -0500607 char **mount_options = opts->mnt_opts;
608 int *flags = opts->mnt_opts_flags;
609 int num_opts = opts->num_mnt_opts;
Eric Parisc9180a52007-11-30 13:00:35 -0500610
611 mutex_lock(&sbsec->lock);
612
613 if (!ss_initialized) {
614 if (!num_opts) {
615 /* Defer initialization until selinux_complete_init,
616 after the initial policy is loaded and the security
617 server is ready to handle calls. */
618 spin_lock(&sb_security_lock);
619 if (list_empty(&sbsec->list))
620 list_add(&sbsec->list, &superblock_security_head);
621 spin_unlock(&sb_security_lock);
622 goto out;
623 }
624 rc = -EINVAL;
Eric Paris744ba352008-04-17 11:52:44 -0400625 printk(KERN_WARNING "SELinux: Unable to set superblock options "
626 "before the security server is initialized\n");
Eric Parisc9180a52007-11-30 13:00:35 -0500627 goto out;
628 }
629
630 /*
Eric Parise0007522008-03-05 10:31:54 -0500631 * Binary mount data FS will come through this function twice. Once
632 * from an explicit call and once from the generic calls from the vfs.
633 * Since the generic VFS calls will not contain any security mount data
634 * we need to skip the double mount verification.
635 *
636 * This does open a hole in which we will not notice if the first
637 * mount using this sb set explict options and a second mount using
638 * this sb does not set any security options. (The first options
639 * will be used for both mounts)
640 */
David P. Quigley0d90a7e2009-01-16 09:22:02 -0500641 if ((sbsec->flags & SE_SBINITIALIZED) && (sb->s_type->fs_flags & FS_BINARY_MOUNTDATA)
Eric Parise0007522008-03-05 10:31:54 -0500642 && (num_opts == 0))
Eric Parisf5269712008-05-14 11:27:45 -0400643 goto out;
Eric Parise0007522008-03-05 10:31:54 -0500644
645 /*
Eric Parisc9180a52007-11-30 13:00:35 -0500646 * parse the mount options, check if they are valid sids.
647 * also check if someone is trying to mount the same sb more
648 * than once with different security options.
649 */
650 for (i = 0; i < num_opts; i++) {
651 u32 sid;
David P. Quigley11689d42009-01-16 09:22:03 -0500652
653 if (flags[i] == SE_SBLABELSUPP)
654 continue;
Eric Parisc9180a52007-11-30 13:00:35 -0500655 rc = security_context_to_sid(mount_options[i],
656 strlen(mount_options[i]), &sid);
657 if (rc) {
658 printk(KERN_WARNING "SELinux: security_context_to_sid"
659 "(%s) failed for (dev %s, type %s) errno=%d\n",
660 mount_options[i], sb->s_id, name, rc);
661 goto out;
662 }
663 switch (flags[i]) {
664 case FSCONTEXT_MNT:
665 fscontext_sid = sid;
666
667 if (bad_option(sbsec, FSCONTEXT_MNT, sbsec->sid,
668 fscontext_sid))
669 goto out_double_mount;
670
671 sbsec->flags |= FSCONTEXT_MNT;
672 break;
673 case CONTEXT_MNT:
674 context_sid = sid;
675
676 if (bad_option(sbsec, CONTEXT_MNT, sbsec->mntpoint_sid,
677 context_sid))
678 goto out_double_mount;
679
680 sbsec->flags |= CONTEXT_MNT;
681 break;
682 case ROOTCONTEXT_MNT:
683 rootcontext_sid = sid;
684
685 if (bad_option(sbsec, ROOTCONTEXT_MNT, root_isec->sid,
686 rootcontext_sid))
687 goto out_double_mount;
688
689 sbsec->flags |= ROOTCONTEXT_MNT;
690
691 break;
692 case DEFCONTEXT_MNT:
693 defcontext_sid = sid;
694
695 if (bad_option(sbsec, DEFCONTEXT_MNT, sbsec->def_sid,
696 defcontext_sid))
697 goto out_double_mount;
698
699 sbsec->flags |= DEFCONTEXT_MNT;
700
701 break;
702 default:
703 rc = -EINVAL;
704 goto out;
705 }
706 }
707
David P. Quigley0d90a7e2009-01-16 09:22:02 -0500708 if (sbsec->flags & SE_SBINITIALIZED) {
Eric Parisc9180a52007-11-30 13:00:35 -0500709 /* previously mounted with options, but not on this attempt? */
David P. Quigley0d90a7e2009-01-16 09:22:02 -0500710 if ((sbsec->flags & SE_MNTMASK) && !num_opts)
Eric Parisc9180a52007-11-30 13:00:35 -0500711 goto out_double_mount;
712 rc = 0;
713 goto out;
714 }
715
James Morris089be432008-07-15 18:32:49 +1000716 if (strcmp(sb->s_type->name, "proc") == 0)
David P. Quigley0d90a7e2009-01-16 09:22:02 -0500717 sbsec->flags |= SE_SBPROC;
Eric Parisc9180a52007-11-30 13:00:35 -0500718
719 /* Determine the labeling behavior to use for this filesystem type. */
David P. Quigley0d90a7e2009-01-16 09:22:02 -0500720 rc = security_fs_use((sbsec->flags & SE_SBPROC) ? "proc" : sb->s_type->name, &sbsec->behavior, &sbsec->sid);
Eric Parisc9180a52007-11-30 13:00:35 -0500721 if (rc) {
722 printk(KERN_WARNING "%s: security_fs_use(%s) returned %d\n",
James Morris089be432008-07-15 18:32:49 +1000723 __func__, sb->s_type->name, rc);
Eric Parisc9180a52007-11-30 13:00:35 -0500724 goto out;
725 }
726
727 /* sets the context of the superblock for the fs being mounted. */
728 if (fscontext_sid) {
David Howells275bb412008-11-14 10:39:19 +1100729 rc = may_context_mount_sb_relabel(fscontext_sid, sbsec, cred);
Eric Parisc9180a52007-11-30 13:00:35 -0500730 if (rc)
731 goto out;
732
733 sbsec->sid = fscontext_sid;
734 }
735
736 /*
737 * Switch to using mount point labeling behavior.
738 * sets the label used on all file below the mountpoint, and will set
739 * the superblock context if not already set.
740 */
741 if (context_sid) {
742 if (!fscontext_sid) {
David Howells275bb412008-11-14 10:39:19 +1100743 rc = may_context_mount_sb_relabel(context_sid, sbsec,
744 cred);
Eric Parisc9180a52007-11-30 13:00:35 -0500745 if (rc)
746 goto out;
747 sbsec->sid = context_sid;
748 } else {
David Howells275bb412008-11-14 10:39:19 +1100749 rc = may_context_mount_inode_relabel(context_sid, sbsec,
750 cred);
Eric Parisc9180a52007-11-30 13:00:35 -0500751 if (rc)
752 goto out;
753 }
754 if (!rootcontext_sid)
755 rootcontext_sid = context_sid;
756
757 sbsec->mntpoint_sid = context_sid;
758 sbsec->behavior = SECURITY_FS_USE_MNTPOINT;
759 }
760
761 if (rootcontext_sid) {
David Howells275bb412008-11-14 10:39:19 +1100762 rc = may_context_mount_inode_relabel(rootcontext_sid, sbsec,
763 cred);
Eric Parisc9180a52007-11-30 13:00:35 -0500764 if (rc)
765 goto out;
766
767 root_isec->sid = rootcontext_sid;
768 root_isec->initialized = 1;
769 }
770
771 if (defcontext_sid) {
772 if (sbsec->behavior != SECURITY_FS_USE_XATTR) {
773 rc = -EINVAL;
774 printk(KERN_WARNING "SELinux: defcontext option is "
775 "invalid for this filesystem type\n");
776 goto out;
777 }
778
779 if (defcontext_sid != sbsec->def_sid) {
780 rc = may_context_mount_inode_relabel(defcontext_sid,
David Howells275bb412008-11-14 10:39:19 +1100781 sbsec, cred);
Eric Parisc9180a52007-11-30 13:00:35 -0500782 if (rc)
783 goto out;
784 }
785
786 sbsec->def_sid = defcontext_sid;
787 }
788
789 rc = sb_finish_set_opts(sb);
790out:
Eric Parisbc7e9822006-09-25 23:32:02 -0700791 mutex_unlock(&sbsec->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700792 return rc;
Eric Parisc9180a52007-11-30 13:00:35 -0500793out_double_mount:
794 rc = -EINVAL;
795 printk(KERN_WARNING "SELinux: mount invalid. Same superblock, different "
796 "security settings for (dev %s, type %s)\n", sb->s_id, name);
797 goto out;
798}
799
800static void selinux_sb_clone_mnt_opts(const struct super_block *oldsb,
801 struct super_block *newsb)
802{
803 const struct superblock_security_struct *oldsbsec = oldsb->s_security;
804 struct superblock_security_struct *newsbsec = newsb->s_security;
805
806 int set_fscontext = (oldsbsec->flags & FSCONTEXT_MNT);
807 int set_context = (oldsbsec->flags & CONTEXT_MNT);
808 int set_rootcontext = (oldsbsec->flags & ROOTCONTEXT_MNT);
809
Eric Paris0f5e6422008-04-21 16:24:11 -0400810 /*
811 * if the parent was able to be mounted it clearly had no special lsm
812 * mount options. thus we can safely put this sb on the list and deal
813 * with it later
814 */
815 if (!ss_initialized) {
816 spin_lock(&sb_security_lock);
817 if (list_empty(&newsbsec->list))
818 list_add(&newsbsec->list, &superblock_security_head);
819 spin_unlock(&sb_security_lock);
820 return;
821 }
Eric Parisc9180a52007-11-30 13:00:35 -0500822
Eric Parisc9180a52007-11-30 13:00:35 -0500823 /* how can we clone if the old one wasn't set up?? */
David P. Quigley0d90a7e2009-01-16 09:22:02 -0500824 BUG_ON(!(oldsbsec->flags & SE_SBINITIALIZED));
Eric Parisc9180a52007-11-30 13:00:35 -0500825
Eric Paris5a552612008-04-09 14:08:35 -0400826 /* if fs is reusing a sb, just let its options stand... */
David P. Quigley0d90a7e2009-01-16 09:22:02 -0500827 if (newsbsec->flags & SE_SBINITIALIZED)
Eric Paris5a552612008-04-09 14:08:35 -0400828 return;
829
Eric Parisc9180a52007-11-30 13:00:35 -0500830 mutex_lock(&newsbsec->lock);
831
832 newsbsec->flags = oldsbsec->flags;
833
834 newsbsec->sid = oldsbsec->sid;
835 newsbsec->def_sid = oldsbsec->def_sid;
836 newsbsec->behavior = oldsbsec->behavior;
837
838 if (set_context) {
839 u32 sid = oldsbsec->mntpoint_sid;
840
841 if (!set_fscontext)
842 newsbsec->sid = sid;
843 if (!set_rootcontext) {
844 struct inode *newinode = newsb->s_root->d_inode;
845 struct inode_security_struct *newisec = newinode->i_security;
846 newisec->sid = sid;
847 }
848 newsbsec->mntpoint_sid = sid;
849 }
850 if (set_rootcontext) {
851 const struct inode *oldinode = oldsb->s_root->d_inode;
852 const struct inode_security_struct *oldisec = oldinode->i_security;
853 struct inode *newinode = newsb->s_root->d_inode;
854 struct inode_security_struct *newisec = newinode->i_security;
855
856 newisec->sid = oldisec->sid;
857 }
858
859 sb_finish_set_opts(newsb);
860 mutex_unlock(&newsbsec->lock);
861}
862
Adrian Bunk2e1479d2008-03-17 22:29:23 +0200863static int selinux_parse_opts_str(char *options,
864 struct security_mnt_opts *opts)
Eric Parisc9180a52007-11-30 13:00:35 -0500865{
Eric Parise0007522008-03-05 10:31:54 -0500866 char *p;
Eric Parisc9180a52007-11-30 13:00:35 -0500867 char *context = NULL, *defcontext = NULL;
868 char *fscontext = NULL, *rootcontext = NULL;
Eric Parise0007522008-03-05 10:31:54 -0500869 int rc, num_mnt_opts = 0;
Eric Parisc9180a52007-11-30 13:00:35 -0500870
Eric Parise0007522008-03-05 10:31:54 -0500871 opts->num_mnt_opts = 0;
Eric Parisc9180a52007-11-30 13:00:35 -0500872
873 /* Standard string-based options. */
874 while ((p = strsep(&options, "|")) != NULL) {
875 int token;
876 substring_t args[MAX_OPT_ARGS];
877
878 if (!*p)
879 continue;
880
881 token = match_token(p, tokens, args);
882
883 switch (token) {
884 case Opt_context:
885 if (context || defcontext) {
886 rc = -EINVAL;
887 printk(KERN_WARNING SEL_MOUNT_FAIL_MSG);
888 goto out_err;
889 }
890 context = match_strdup(&args[0]);
891 if (!context) {
892 rc = -ENOMEM;
893 goto out_err;
894 }
895 break;
896
897 case Opt_fscontext:
898 if (fscontext) {
899 rc = -EINVAL;
900 printk(KERN_WARNING SEL_MOUNT_FAIL_MSG);
901 goto out_err;
902 }
903 fscontext = match_strdup(&args[0]);
904 if (!fscontext) {
905 rc = -ENOMEM;
906 goto out_err;
907 }
908 break;
909
910 case Opt_rootcontext:
911 if (rootcontext) {
912 rc = -EINVAL;
913 printk(KERN_WARNING SEL_MOUNT_FAIL_MSG);
914 goto out_err;
915 }
916 rootcontext = match_strdup(&args[0]);
917 if (!rootcontext) {
918 rc = -ENOMEM;
919 goto out_err;
920 }
921 break;
922
923 case Opt_defcontext:
924 if (context || defcontext) {
925 rc = -EINVAL;
926 printk(KERN_WARNING SEL_MOUNT_FAIL_MSG);
927 goto out_err;
928 }
929 defcontext = match_strdup(&args[0]);
930 if (!defcontext) {
931 rc = -ENOMEM;
932 goto out_err;
933 }
934 break;
David P. Quigley11689d42009-01-16 09:22:03 -0500935 case Opt_labelsupport:
936 break;
Eric Parisc9180a52007-11-30 13:00:35 -0500937 default:
938 rc = -EINVAL;
939 printk(KERN_WARNING "SELinux: unknown mount option\n");
940 goto out_err;
941
942 }
943 }
944
Eric Parise0007522008-03-05 10:31:54 -0500945 rc = -ENOMEM;
946 opts->mnt_opts = kcalloc(NUM_SEL_MNT_OPTS, sizeof(char *), GFP_ATOMIC);
947 if (!opts->mnt_opts)
948 goto out_err;
949
950 opts->mnt_opts_flags = kcalloc(NUM_SEL_MNT_OPTS, sizeof(int), GFP_ATOMIC);
951 if (!opts->mnt_opts_flags) {
952 kfree(opts->mnt_opts);
953 goto out_err;
Eric Parisc9180a52007-11-30 13:00:35 -0500954 }
955
Eric Parise0007522008-03-05 10:31:54 -0500956 if (fscontext) {
957 opts->mnt_opts[num_mnt_opts] = fscontext;
958 opts->mnt_opts_flags[num_mnt_opts++] = FSCONTEXT_MNT;
959 }
960 if (context) {
961 opts->mnt_opts[num_mnt_opts] = context;
962 opts->mnt_opts_flags[num_mnt_opts++] = CONTEXT_MNT;
963 }
964 if (rootcontext) {
965 opts->mnt_opts[num_mnt_opts] = rootcontext;
966 opts->mnt_opts_flags[num_mnt_opts++] = ROOTCONTEXT_MNT;
967 }
968 if (defcontext) {
969 opts->mnt_opts[num_mnt_opts] = defcontext;
970 opts->mnt_opts_flags[num_mnt_opts++] = DEFCONTEXT_MNT;
971 }
972
973 opts->num_mnt_opts = num_mnt_opts;
974 return 0;
975
Eric Parisc9180a52007-11-30 13:00:35 -0500976out_err:
977 kfree(context);
978 kfree(defcontext);
979 kfree(fscontext);
980 kfree(rootcontext);
981 return rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700982}
Eric Parise0007522008-03-05 10:31:54 -0500983/*
984 * string mount options parsing and call set the sbsec
985 */
986static int superblock_doinit(struct super_block *sb, void *data)
987{
988 int rc = 0;
989 char *options = data;
990 struct security_mnt_opts opts;
991
992 security_init_mnt_opts(&opts);
993
994 if (!data)
995 goto out;
996
997 BUG_ON(sb->s_type->fs_flags & FS_BINARY_MOUNTDATA);
998
999 rc = selinux_parse_opts_str(options, &opts);
1000 if (rc)
1001 goto out_err;
1002
1003out:
1004 rc = selinux_set_mnt_opts(sb, &opts);
1005
1006out_err:
1007 security_free_mnt_opts(&opts);
1008 return rc;
1009}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001010
Adrian Bunk3583a712008-07-22 20:21:23 +03001011static void selinux_write_opts(struct seq_file *m,
1012 struct security_mnt_opts *opts)
Eric Paris2069f452008-07-04 09:47:13 +10001013{
1014 int i;
1015 char *prefix;
1016
1017 for (i = 0; i < opts->num_mnt_opts; i++) {
David P. Quigley11689d42009-01-16 09:22:03 -05001018 char *has_comma;
1019
1020 if (opts->mnt_opts[i])
1021 has_comma = strchr(opts->mnt_opts[i], ',');
1022 else
1023 has_comma = NULL;
Eric Paris2069f452008-07-04 09:47:13 +10001024
1025 switch (opts->mnt_opts_flags[i]) {
1026 case CONTEXT_MNT:
1027 prefix = CONTEXT_STR;
1028 break;
1029 case FSCONTEXT_MNT:
1030 prefix = FSCONTEXT_STR;
1031 break;
1032 case ROOTCONTEXT_MNT:
1033 prefix = ROOTCONTEXT_STR;
1034 break;
1035 case DEFCONTEXT_MNT:
1036 prefix = DEFCONTEXT_STR;
1037 break;
David P. Quigley11689d42009-01-16 09:22:03 -05001038 case SE_SBLABELSUPP:
1039 seq_putc(m, ',');
1040 seq_puts(m, LABELSUPP_STR);
1041 continue;
Eric Paris2069f452008-07-04 09:47:13 +10001042 default:
1043 BUG();
1044 };
1045 /* we need a comma before each option */
1046 seq_putc(m, ',');
1047 seq_puts(m, prefix);
1048 if (has_comma)
1049 seq_putc(m, '\"');
1050 seq_puts(m, opts->mnt_opts[i]);
1051 if (has_comma)
1052 seq_putc(m, '\"');
1053 }
1054}
1055
1056static int selinux_sb_show_options(struct seq_file *m, struct super_block *sb)
1057{
1058 struct security_mnt_opts opts;
1059 int rc;
1060
1061 rc = selinux_get_mnt_opts(sb, &opts);
Eric Paris383795c2008-07-29 17:07:26 -04001062 if (rc) {
1063 /* before policy load we may get EINVAL, don't show anything */
1064 if (rc == -EINVAL)
1065 rc = 0;
Eric Paris2069f452008-07-04 09:47:13 +10001066 return rc;
Eric Paris383795c2008-07-29 17:07:26 -04001067 }
Eric Paris2069f452008-07-04 09:47:13 +10001068
1069 selinux_write_opts(m, &opts);
1070
1071 security_free_mnt_opts(&opts);
1072
1073 return rc;
1074}
1075
Linus Torvalds1da177e2005-04-16 15:20:36 -07001076static inline u16 inode_mode_to_security_class(umode_t mode)
1077{
1078 switch (mode & S_IFMT) {
1079 case S_IFSOCK:
1080 return SECCLASS_SOCK_FILE;
1081 case S_IFLNK:
1082 return SECCLASS_LNK_FILE;
1083 case S_IFREG:
1084 return SECCLASS_FILE;
1085 case S_IFBLK:
1086 return SECCLASS_BLK_FILE;
1087 case S_IFDIR:
1088 return SECCLASS_DIR;
1089 case S_IFCHR:
1090 return SECCLASS_CHR_FILE;
1091 case S_IFIFO:
1092 return SECCLASS_FIFO_FILE;
1093
1094 }
1095
1096 return SECCLASS_FILE;
1097}
1098
James Morris13402582005-09-30 14:24:34 -04001099static inline int default_protocol_stream(int protocol)
1100{
1101 return (protocol == IPPROTO_IP || protocol == IPPROTO_TCP);
1102}
1103
1104static inline int default_protocol_dgram(int protocol)
1105{
1106 return (protocol == IPPROTO_IP || protocol == IPPROTO_UDP);
1107}
1108
Linus Torvalds1da177e2005-04-16 15:20:36 -07001109static inline u16 socket_type_to_security_class(int family, int type, int protocol)
1110{
1111 switch (family) {
1112 case PF_UNIX:
1113 switch (type) {
1114 case SOCK_STREAM:
1115 case SOCK_SEQPACKET:
1116 return SECCLASS_UNIX_STREAM_SOCKET;
1117 case SOCK_DGRAM:
1118 return SECCLASS_UNIX_DGRAM_SOCKET;
1119 }
1120 break;
1121 case PF_INET:
1122 case PF_INET6:
1123 switch (type) {
1124 case SOCK_STREAM:
James Morris13402582005-09-30 14:24:34 -04001125 if (default_protocol_stream(protocol))
1126 return SECCLASS_TCP_SOCKET;
1127 else
1128 return SECCLASS_RAWIP_SOCKET;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001129 case SOCK_DGRAM:
James Morris13402582005-09-30 14:24:34 -04001130 if (default_protocol_dgram(protocol))
1131 return SECCLASS_UDP_SOCKET;
1132 else
1133 return SECCLASS_RAWIP_SOCKET;
James Morris2ee92d42006-11-13 16:09:01 -08001134 case SOCK_DCCP:
1135 return SECCLASS_DCCP_SOCKET;
James Morris13402582005-09-30 14:24:34 -04001136 default:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001137 return SECCLASS_RAWIP_SOCKET;
1138 }
1139 break;
1140 case PF_NETLINK:
1141 switch (protocol) {
1142 case NETLINK_ROUTE:
1143 return SECCLASS_NETLINK_ROUTE_SOCKET;
1144 case NETLINK_FIREWALL:
1145 return SECCLASS_NETLINK_FIREWALL_SOCKET;
James Morris216efaa2005-08-15 20:34:48 -07001146 case NETLINK_INET_DIAG:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001147 return SECCLASS_NETLINK_TCPDIAG_SOCKET;
1148 case NETLINK_NFLOG:
1149 return SECCLASS_NETLINK_NFLOG_SOCKET;
1150 case NETLINK_XFRM:
1151 return SECCLASS_NETLINK_XFRM_SOCKET;
1152 case NETLINK_SELINUX:
1153 return SECCLASS_NETLINK_SELINUX_SOCKET;
1154 case NETLINK_AUDIT:
1155 return SECCLASS_NETLINK_AUDIT_SOCKET;
1156 case NETLINK_IP6_FW:
1157 return SECCLASS_NETLINK_IP6FW_SOCKET;
1158 case NETLINK_DNRTMSG:
1159 return SECCLASS_NETLINK_DNRT_SOCKET;
James Morris0c9b7942005-04-16 15:24:13 -07001160 case NETLINK_KOBJECT_UEVENT:
1161 return SECCLASS_NETLINK_KOBJECT_UEVENT_SOCKET;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001162 default:
1163 return SECCLASS_NETLINK_SOCKET;
1164 }
1165 case PF_PACKET:
1166 return SECCLASS_PACKET_SOCKET;
1167 case PF_KEY:
1168 return SECCLASS_KEY_SOCKET;
Christopher J. PeBenito3e3ff152006-06-09 00:25:03 -07001169 case PF_APPLETALK:
1170 return SECCLASS_APPLETALK_SOCKET;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001171 }
1172
1173 return SECCLASS_SOCKET;
1174}
1175
1176#ifdef CONFIG_PROC_FS
1177static int selinux_proc_get_sid(struct proc_dir_entry *de,
1178 u16 tclass,
1179 u32 *sid)
1180{
1181 int buflen, rc;
1182 char *buffer, *path, *end;
1183
Eric Paris828dfe12008-04-17 13:17:49 -04001184 buffer = (char *)__get_free_page(GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001185 if (!buffer)
1186 return -ENOMEM;
1187
1188 buflen = PAGE_SIZE;
1189 end = buffer+buflen;
1190 *--end = '\0';
1191 buflen--;
1192 path = end-1;
1193 *path = '/';
1194 while (de && de != de->parent) {
1195 buflen -= de->namelen + 1;
1196 if (buflen < 0)
1197 break;
1198 end -= de->namelen;
1199 memcpy(end, de->name, de->namelen);
1200 *--end = '/';
1201 path = end;
1202 de = de->parent;
1203 }
1204 rc = security_genfs_sid("proc", path, tclass, sid);
1205 free_page((unsigned long)buffer);
1206 return rc;
1207}
1208#else
1209static int selinux_proc_get_sid(struct proc_dir_entry *de,
1210 u16 tclass,
1211 u32 *sid)
1212{
1213 return -EINVAL;
1214}
1215#endif
1216
1217/* The inode's security attributes must be initialized before first use. */
1218static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dentry)
1219{
1220 struct superblock_security_struct *sbsec = NULL;
1221 struct inode_security_struct *isec = inode->i_security;
1222 u32 sid;
1223 struct dentry *dentry;
1224#define INITCONTEXTLEN 255
1225 char *context = NULL;
1226 unsigned len = 0;
1227 int rc = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001228
1229 if (isec->initialized)
1230 goto out;
1231
Eric Paris23970742006-09-25 23:32:01 -07001232 mutex_lock(&isec->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001233 if (isec->initialized)
Eric Paris23970742006-09-25 23:32:01 -07001234 goto out_unlock;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001235
1236 sbsec = inode->i_sb->s_security;
David P. Quigley0d90a7e2009-01-16 09:22:02 -05001237 if (!(sbsec->flags & SE_SBINITIALIZED)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001238 /* Defer initialization until selinux_complete_init,
1239 after the initial policy is loaded and the security
1240 server is ready to handle calls. */
1241 spin_lock(&sbsec->isec_lock);
1242 if (list_empty(&isec->list))
1243 list_add(&isec->list, &sbsec->isec_head);
1244 spin_unlock(&sbsec->isec_lock);
Eric Paris23970742006-09-25 23:32:01 -07001245 goto out_unlock;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001246 }
1247
1248 switch (sbsec->behavior) {
1249 case SECURITY_FS_USE_XATTR:
1250 if (!inode->i_op->getxattr) {
1251 isec->sid = sbsec->def_sid;
1252 break;
1253 }
1254
1255 /* Need a dentry, since the xattr API requires one.
1256 Life would be simpler if we could just pass the inode. */
1257 if (opt_dentry) {
1258 /* Called from d_instantiate or d_splice_alias. */
1259 dentry = dget(opt_dentry);
1260 } else {
1261 /* Called from selinux_complete_init, try to find a dentry. */
1262 dentry = d_find_alias(inode);
1263 }
1264 if (!dentry) {
Eric Parisdf7f54c2009-03-09 14:35:58 -04001265 /*
1266 * this is can be hit on boot when a file is accessed
1267 * before the policy is loaded. When we load policy we
1268 * may find inodes that have no dentry on the
1269 * sbsec->isec_head list. No reason to complain as these
1270 * will get fixed up the next time we go through
1271 * inode_doinit with a dentry, before these inodes could
1272 * be used again by userspace.
1273 */
Eric Paris23970742006-09-25 23:32:01 -07001274 goto out_unlock;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001275 }
1276
1277 len = INITCONTEXTLEN;
Eric Paris4cb912f2009-02-12 14:50:05 -05001278 context = kmalloc(len+1, GFP_NOFS);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001279 if (!context) {
1280 rc = -ENOMEM;
1281 dput(dentry);
Eric Paris23970742006-09-25 23:32:01 -07001282 goto out_unlock;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001283 }
Eric Paris4cb912f2009-02-12 14:50:05 -05001284 context[len] = '\0';
Linus Torvalds1da177e2005-04-16 15:20:36 -07001285 rc = inode->i_op->getxattr(dentry, XATTR_NAME_SELINUX,
1286 context, len);
1287 if (rc == -ERANGE) {
1288 /* Need a larger buffer. Query for the right size. */
1289 rc = inode->i_op->getxattr(dentry, XATTR_NAME_SELINUX,
1290 NULL, 0);
1291 if (rc < 0) {
1292 dput(dentry);
Eric Paris23970742006-09-25 23:32:01 -07001293 goto out_unlock;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001294 }
1295 kfree(context);
1296 len = rc;
Eric Paris4cb912f2009-02-12 14:50:05 -05001297 context = kmalloc(len+1, GFP_NOFS);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001298 if (!context) {
1299 rc = -ENOMEM;
1300 dput(dentry);
Eric Paris23970742006-09-25 23:32:01 -07001301 goto out_unlock;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001302 }
Eric Paris4cb912f2009-02-12 14:50:05 -05001303 context[len] = '\0';
Linus Torvalds1da177e2005-04-16 15:20:36 -07001304 rc = inode->i_op->getxattr(dentry,
1305 XATTR_NAME_SELINUX,
1306 context, len);
1307 }
1308 dput(dentry);
1309 if (rc < 0) {
1310 if (rc != -ENODATA) {
Eric Paris744ba352008-04-17 11:52:44 -04001311 printk(KERN_WARNING "SELinux: %s: getxattr returned "
Harvey Harrisondd6f9532008-03-06 10:03:59 +11001312 "%d for dev=%s ino=%ld\n", __func__,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001313 -rc, inode->i_sb->s_id, inode->i_ino);
1314 kfree(context);
Eric Paris23970742006-09-25 23:32:01 -07001315 goto out_unlock;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001316 }
1317 /* Map ENODATA to the default file SID */
1318 sid = sbsec->def_sid;
1319 rc = 0;
1320 } else {
James Morrisf5c1d5b2005-07-28 01:07:37 -07001321 rc = security_context_to_sid_default(context, rc, &sid,
Stephen Smalley869ab512008-04-04 08:46:05 -04001322 sbsec->def_sid,
1323 GFP_NOFS);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001324 if (rc) {
Eric Paris4ba0a8a2009-02-12 15:01:10 -05001325 char *dev = inode->i_sb->s_id;
1326 unsigned long ino = inode->i_ino;
1327
1328 if (rc == -EINVAL) {
1329 if (printk_ratelimit())
1330 printk(KERN_NOTICE "SELinux: inode=%lu on dev=%s was found to have an invalid "
1331 "context=%s. This indicates you may need to relabel the inode or the "
1332 "filesystem in question.\n", ino, dev, context);
1333 } else {
1334 printk(KERN_WARNING "SELinux: %s: context_to_sid(%s) "
1335 "returned %d for dev=%s ino=%ld\n",
1336 __func__, context, -rc, dev, ino);
1337 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001338 kfree(context);
1339 /* Leave with the unlabeled SID */
1340 rc = 0;
1341 break;
1342 }
1343 }
1344 kfree(context);
1345 isec->sid = sid;
1346 break;
1347 case SECURITY_FS_USE_TASK:
1348 isec->sid = isec->task_sid;
1349 break;
1350 case SECURITY_FS_USE_TRANS:
1351 /* Default to the fs SID. */
1352 isec->sid = sbsec->sid;
1353
1354 /* Try to obtain a transition SID. */
1355 isec->sclass = inode_mode_to_security_class(inode->i_mode);
1356 rc = security_transition_sid(isec->task_sid,
1357 sbsec->sid,
1358 isec->sclass,
1359 &sid);
1360 if (rc)
Eric Paris23970742006-09-25 23:32:01 -07001361 goto out_unlock;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001362 isec->sid = sid;
1363 break;
Eric Parisc312feb2006-07-10 04:43:53 -07001364 case SECURITY_FS_USE_MNTPOINT:
1365 isec->sid = sbsec->mntpoint_sid;
1366 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001367 default:
Eric Parisc312feb2006-07-10 04:43:53 -07001368 /* Default to the fs superblock SID. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001369 isec->sid = sbsec->sid;
1370
David P. Quigley0d90a7e2009-01-16 09:22:02 -05001371 if ((sbsec->flags & SE_SBPROC) && !S_ISLNK(inode->i_mode)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001372 struct proc_inode *proci = PROC_I(inode);
1373 if (proci->pde) {
1374 isec->sclass = inode_mode_to_security_class(inode->i_mode);
1375 rc = selinux_proc_get_sid(proci->pde,
1376 isec->sclass,
1377 &sid);
1378 if (rc)
Eric Paris23970742006-09-25 23:32:01 -07001379 goto out_unlock;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001380 isec->sid = sid;
1381 }
1382 }
1383 break;
1384 }
1385
1386 isec->initialized = 1;
1387
Eric Paris23970742006-09-25 23:32:01 -07001388out_unlock:
1389 mutex_unlock(&isec->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001390out:
1391 if (isec->sclass == SECCLASS_FILE)
1392 isec->sclass = inode_mode_to_security_class(inode->i_mode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001393 return rc;
1394}
1395
1396/* Convert a Linux signal to an access vector. */
1397static inline u32 signal_to_av(int sig)
1398{
1399 u32 perm = 0;
1400
1401 switch (sig) {
1402 case SIGCHLD:
1403 /* Commonly granted from child to parent. */
1404 perm = PROCESS__SIGCHLD;
1405 break;
1406 case SIGKILL:
1407 /* Cannot be caught or ignored */
1408 perm = PROCESS__SIGKILL;
1409 break;
1410 case SIGSTOP:
1411 /* Cannot be caught or ignored */
1412 perm = PROCESS__SIGSTOP;
1413 break;
1414 default:
1415 /* All other signals. */
1416 perm = PROCESS__SIGNAL;
1417 break;
1418 }
1419
1420 return perm;
1421}
1422
David Howells275bb412008-11-14 10:39:19 +11001423/*
David Howellsd84f4f92008-11-14 10:39:23 +11001424 * Check permission between a pair of credentials
1425 * fork check, ptrace check, etc.
1426 */
1427static int cred_has_perm(const struct cred *actor,
1428 const struct cred *target,
1429 u32 perms)
1430{
1431 u32 asid = cred_sid(actor), tsid = cred_sid(target);
1432
1433 return avc_has_perm(asid, tsid, SECCLASS_PROCESS, perms, NULL);
1434}
1435
1436/*
David Howells88e67f32008-11-14 10:39:21 +11001437 * Check permission between a pair of tasks, e.g. signal checks,
David Howells275bb412008-11-14 10:39:19 +11001438 * fork check, ptrace check, etc.
1439 * tsk1 is the actor and tsk2 is the target
David Howells3b11a1d2008-11-14 10:39:26 +11001440 * - this uses the default subjective creds of tsk1
David Howells275bb412008-11-14 10:39:19 +11001441 */
1442static int task_has_perm(const struct task_struct *tsk1,
1443 const struct task_struct *tsk2,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001444 u32 perms)
1445{
David Howells275bb412008-11-14 10:39:19 +11001446 const struct task_security_struct *__tsec1, *__tsec2;
1447 u32 sid1, sid2;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001448
David Howells275bb412008-11-14 10:39:19 +11001449 rcu_read_lock();
1450 __tsec1 = __task_cred(tsk1)->security; sid1 = __tsec1->sid;
1451 __tsec2 = __task_cred(tsk2)->security; sid2 = __tsec2->sid;
1452 rcu_read_unlock();
1453 return avc_has_perm(sid1, sid2, SECCLASS_PROCESS, perms, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001454}
1455
David Howells3b11a1d2008-11-14 10:39:26 +11001456/*
1457 * Check permission between current and another task, e.g. signal checks,
1458 * fork check, ptrace check, etc.
1459 * current is the actor and tsk2 is the target
1460 * - this uses current's subjective creds
1461 */
1462static int current_has_perm(const struct task_struct *tsk,
1463 u32 perms)
1464{
1465 u32 sid, tsid;
1466
1467 sid = current_sid();
1468 tsid = task_sid(tsk);
1469 return avc_has_perm(sid, tsid, SECCLASS_PROCESS, perms, NULL);
1470}
1471
Stephen Smalleyb68e4182008-02-07 11:21:04 -05001472#if CAP_LAST_CAP > 63
1473#error Fix SELinux to handle capabilities > 63.
1474#endif
1475
Linus Torvalds1da177e2005-04-16 15:20:36 -07001476/* Check whether a task is allowed to use a capability. */
1477static int task_has_capability(struct task_struct *tsk,
David Howells3699c532009-01-06 22:27:01 +00001478 const struct cred *cred,
Eric Paris06112162008-11-11 22:02:50 +11001479 int cap, int audit)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001480{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001481 struct avc_audit_data ad;
Eric Paris06112162008-11-11 22:02:50 +11001482 struct av_decision avd;
Stephen Smalleyb68e4182008-02-07 11:21:04 -05001483 u16 sclass;
David Howells3699c532009-01-06 22:27:01 +00001484 u32 sid = cred_sid(cred);
Stephen Smalleyb68e4182008-02-07 11:21:04 -05001485 u32 av = CAP_TO_MASK(cap);
Eric Paris06112162008-11-11 22:02:50 +11001486 int rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001487
Eric Paris828dfe12008-04-17 13:17:49 -04001488 AVC_AUDIT_DATA_INIT(&ad, CAP);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001489 ad.tsk = tsk;
1490 ad.u.cap = cap;
1491
Stephen Smalleyb68e4182008-02-07 11:21:04 -05001492 switch (CAP_TO_INDEX(cap)) {
1493 case 0:
1494 sclass = SECCLASS_CAPABILITY;
1495 break;
1496 case 1:
1497 sclass = SECCLASS_CAPABILITY2;
1498 break;
1499 default:
1500 printk(KERN_ERR
1501 "SELinux: out of range capability %d\n", cap);
1502 BUG();
1503 }
Eric Paris06112162008-11-11 22:02:50 +11001504
David Howells275bb412008-11-14 10:39:19 +11001505 rc = avc_has_perm_noaudit(sid, sid, sclass, av, 0, &avd);
Eric Paris06112162008-11-11 22:02:50 +11001506 if (audit == SECURITY_CAP_AUDIT)
David Howells275bb412008-11-14 10:39:19 +11001507 avc_audit(sid, sid, sclass, av, &avd, rc, &ad);
Eric Paris06112162008-11-11 22:02:50 +11001508 return rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001509}
1510
1511/* Check whether a task is allowed to use a system operation. */
1512static int task_has_system(struct task_struct *tsk,
1513 u32 perms)
1514{
David Howells275bb412008-11-14 10:39:19 +11001515 u32 sid = task_sid(tsk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001516
David Howells275bb412008-11-14 10:39:19 +11001517 return avc_has_perm(sid, SECINITSID_KERNEL,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001518 SECCLASS_SYSTEM, perms, NULL);
1519}
1520
1521/* Check whether a task has a particular permission to an inode.
1522 The 'adp' parameter is optional and allows other audit
1523 data to be passed (e.g. the dentry). */
David Howells88e67f32008-11-14 10:39:21 +11001524static int inode_has_perm(const struct cred *cred,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001525 struct inode *inode,
1526 u32 perms,
1527 struct avc_audit_data *adp)
1528{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001529 struct inode_security_struct *isec;
1530 struct avc_audit_data ad;
David Howells275bb412008-11-14 10:39:19 +11001531 u32 sid;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001532
Eric Paris828dfe12008-04-17 13:17:49 -04001533 if (unlikely(IS_PRIVATE(inode)))
Stephen Smalleybbaca6c2007-02-14 00:34:16 -08001534 return 0;
1535
David Howells88e67f32008-11-14 10:39:21 +11001536 sid = cred_sid(cred);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001537 isec = inode->i_security;
1538
1539 if (!adp) {
1540 adp = &ad;
1541 AVC_AUDIT_DATA_INIT(&ad, FS);
1542 ad.u.fs.inode = inode;
1543 }
1544
David Howells275bb412008-11-14 10:39:19 +11001545 return avc_has_perm(sid, isec->sid, isec->sclass, perms, adp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001546}
1547
1548/* Same as inode_has_perm, but pass explicit audit data containing
1549 the dentry to help the auditing code to more easily generate the
1550 pathname if needed. */
David Howells88e67f32008-11-14 10:39:21 +11001551static inline int dentry_has_perm(const struct cred *cred,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001552 struct vfsmount *mnt,
1553 struct dentry *dentry,
1554 u32 av)
1555{
1556 struct inode *inode = dentry->d_inode;
1557 struct avc_audit_data ad;
David Howells88e67f32008-11-14 10:39:21 +11001558
Eric Paris828dfe12008-04-17 13:17:49 -04001559 AVC_AUDIT_DATA_INIT(&ad, FS);
Jan Blunck44707fd2008-02-14 19:38:33 -08001560 ad.u.fs.path.mnt = mnt;
1561 ad.u.fs.path.dentry = dentry;
David Howells88e67f32008-11-14 10:39:21 +11001562 return inode_has_perm(cred, inode, av, &ad);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001563}
1564
1565/* Check whether a task can use an open file descriptor to
1566 access an inode in a given way. Check access to the
1567 descriptor itself, and then use dentry_has_perm to
1568 check a particular permission to the file.
1569 Access to the descriptor is implicitly granted if it
1570 has the same SID as the process. If av is zero, then
1571 access to the file is not checked, e.g. for cases
1572 where only the descriptor is affected like seek. */
David Howells88e67f32008-11-14 10:39:21 +11001573static int file_has_perm(const struct cred *cred,
1574 struct file *file,
1575 u32 av)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001576{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001577 struct file_security_struct *fsec = file->f_security;
Jan Blunck44707fd2008-02-14 19:38:33 -08001578 struct inode *inode = file->f_path.dentry->d_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001579 struct avc_audit_data ad;
David Howells88e67f32008-11-14 10:39:21 +11001580 u32 sid = cred_sid(cred);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001581 int rc;
1582
1583 AVC_AUDIT_DATA_INIT(&ad, FS);
Jan Blunck44707fd2008-02-14 19:38:33 -08001584 ad.u.fs.path = file->f_path;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001585
David Howells275bb412008-11-14 10:39:19 +11001586 if (sid != fsec->sid) {
1587 rc = avc_has_perm(sid, fsec->sid,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001588 SECCLASS_FD,
1589 FD__USE,
1590 &ad);
1591 if (rc)
David Howells88e67f32008-11-14 10:39:21 +11001592 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001593 }
1594
1595 /* av is zero if only checking access to the descriptor. */
David Howells88e67f32008-11-14 10:39:21 +11001596 rc = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001597 if (av)
David Howells88e67f32008-11-14 10:39:21 +11001598 rc = inode_has_perm(cred, inode, av, &ad);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001599
David Howells88e67f32008-11-14 10:39:21 +11001600out:
1601 return rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001602}
1603
1604/* Check whether a task can create a file. */
1605static int may_create(struct inode *dir,
1606 struct dentry *dentry,
1607 u16 tclass)
1608{
David Howells275bb412008-11-14 10:39:19 +11001609 const struct cred *cred = current_cred();
1610 const struct task_security_struct *tsec = cred->security;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001611 struct inode_security_struct *dsec;
1612 struct superblock_security_struct *sbsec;
David Howells275bb412008-11-14 10:39:19 +11001613 u32 sid, newsid;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001614 struct avc_audit_data ad;
1615 int rc;
1616
Linus Torvalds1da177e2005-04-16 15:20:36 -07001617 dsec = dir->i_security;
1618 sbsec = dir->i_sb->s_security;
1619
David Howells275bb412008-11-14 10:39:19 +11001620 sid = tsec->sid;
1621 newsid = tsec->create_sid;
1622
Linus Torvalds1da177e2005-04-16 15:20:36 -07001623 AVC_AUDIT_DATA_INIT(&ad, FS);
Jan Blunck44707fd2008-02-14 19:38:33 -08001624 ad.u.fs.path.dentry = dentry;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001625
David Howells275bb412008-11-14 10:39:19 +11001626 rc = avc_has_perm(sid, dsec->sid, SECCLASS_DIR,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001627 DIR__ADD_NAME | DIR__SEARCH,
1628 &ad);
1629 if (rc)
1630 return rc;
1631
David P. Quigleycd895962009-01-16 09:22:04 -05001632 if (!newsid || !(sbsec->flags & SE_SBLABELSUPP)) {
David Howells275bb412008-11-14 10:39:19 +11001633 rc = security_transition_sid(sid, dsec->sid, tclass, &newsid);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001634 if (rc)
1635 return rc;
1636 }
1637
David Howells275bb412008-11-14 10:39:19 +11001638 rc = avc_has_perm(sid, newsid, tclass, FILE__CREATE, &ad);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001639 if (rc)
1640 return rc;
1641
1642 return avc_has_perm(newsid, sbsec->sid,
1643 SECCLASS_FILESYSTEM,
1644 FILESYSTEM__ASSOCIATE, &ad);
1645}
1646
Michael LeMay4eb582c2006-06-26 00:24:57 -07001647/* Check whether a task can create a key. */
1648static int may_create_key(u32 ksid,
1649 struct task_struct *ctx)
1650{
David Howells275bb412008-11-14 10:39:19 +11001651 u32 sid = task_sid(ctx);
Michael LeMay4eb582c2006-06-26 00:24:57 -07001652
David Howells275bb412008-11-14 10:39:19 +11001653 return avc_has_perm(sid, ksid, SECCLASS_KEY, KEY__CREATE, NULL);
Michael LeMay4eb582c2006-06-26 00:24:57 -07001654}
1655
Eric Paris828dfe12008-04-17 13:17:49 -04001656#define MAY_LINK 0
1657#define MAY_UNLINK 1
1658#define MAY_RMDIR 2
Linus Torvalds1da177e2005-04-16 15:20:36 -07001659
1660/* Check whether a task can link, unlink, or rmdir a file/directory. */
1661static int may_link(struct inode *dir,
1662 struct dentry *dentry,
1663 int kind)
1664
1665{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001666 struct inode_security_struct *dsec, *isec;
1667 struct avc_audit_data ad;
David Howells275bb412008-11-14 10:39:19 +11001668 u32 sid = current_sid();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001669 u32 av;
1670 int rc;
1671
Linus Torvalds1da177e2005-04-16 15:20:36 -07001672 dsec = dir->i_security;
1673 isec = dentry->d_inode->i_security;
1674
1675 AVC_AUDIT_DATA_INIT(&ad, FS);
Jan Blunck44707fd2008-02-14 19:38:33 -08001676 ad.u.fs.path.dentry = dentry;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001677
1678 av = DIR__SEARCH;
1679 av |= (kind ? DIR__REMOVE_NAME : DIR__ADD_NAME);
David Howells275bb412008-11-14 10:39:19 +11001680 rc = avc_has_perm(sid, dsec->sid, SECCLASS_DIR, av, &ad);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001681 if (rc)
1682 return rc;
1683
1684 switch (kind) {
1685 case MAY_LINK:
1686 av = FILE__LINK;
1687 break;
1688 case MAY_UNLINK:
1689 av = FILE__UNLINK;
1690 break;
1691 case MAY_RMDIR:
1692 av = DIR__RMDIR;
1693 break;
1694 default:
Eric Paris744ba352008-04-17 11:52:44 -04001695 printk(KERN_WARNING "SELinux: %s: unrecognized kind %d\n",
1696 __func__, kind);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001697 return 0;
1698 }
1699
David Howells275bb412008-11-14 10:39:19 +11001700 rc = avc_has_perm(sid, isec->sid, isec->sclass, av, &ad);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001701 return rc;
1702}
1703
1704static inline int may_rename(struct inode *old_dir,
1705 struct dentry *old_dentry,
1706 struct inode *new_dir,
1707 struct dentry *new_dentry)
1708{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001709 struct inode_security_struct *old_dsec, *new_dsec, *old_isec, *new_isec;
1710 struct avc_audit_data ad;
David Howells275bb412008-11-14 10:39:19 +11001711 u32 sid = current_sid();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001712 u32 av;
1713 int old_is_dir, new_is_dir;
1714 int rc;
1715
Linus Torvalds1da177e2005-04-16 15:20:36 -07001716 old_dsec = old_dir->i_security;
1717 old_isec = old_dentry->d_inode->i_security;
1718 old_is_dir = S_ISDIR(old_dentry->d_inode->i_mode);
1719 new_dsec = new_dir->i_security;
1720
1721 AVC_AUDIT_DATA_INIT(&ad, FS);
1722
Jan Blunck44707fd2008-02-14 19:38:33 -08001723 ad.u.fs.path.dentry = old_dentry;
David Howells275bb412008-11-14 10:39:19 +11001724 rc = avc_has_perm(sid, old_dsec->sid, SECCLASS_DIR,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001725 DIR__REMOVE_NAME | DIR__SEARCH, &ad);
1726 if (rc)
1727 return rc;
David Howells275bb412008-11-14 10:39:19 +11001728 rc = avc_has_perm(sid, old_isec->sid,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001729 old_isec->sclass, FILE__RENAME, &ad);
1730 if (rc)
1731 return rc;
1732 if (old_is_dir && new_dir != old_dir) {
David Howells275bb412008-11-14 10:39:19 +11001733 rc = avc_has_perm(sid, old_isec->sid,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001734 old_isec->sclass, DIR__REPARENT, &ad);
1735 if (rc)
1736 return rc;
1737 }
1738
Jan Blunck44707fd2008-02-14 19:38:33 -08001739 ad.u.fs.path.dentry = new_dentry;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001740 av = DIR__ADD_NAME | DIR__SEARCH;
1741 if (new_dentry->d_inode)
1742 av |= DIR__REMOVE_NAME;
David Howells275bb412008-11-14 10:39:19 +11001743 rc = avc_has_perm(sid, new_dsec->sid, SECCLASS_DIR, av, &ad);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001744 if (rc)
1745 return rc;
1746 if (new_dentry->d_inode) {
1747 new_isec = new_dentry->d_inode->i_security;
1748 new_is_dir = S_ISDIR(new_dentry->d_inode->i_mode);
David Howells275bb412008-11-14 10:39:19 +11001749 rc = avc_has_perm(sid, new_isec->sid,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001750 new_isec->sclass,
1751 (new_is_dir ? DIR__RMDIR : FILE__UNLINK), &ad);
1752 if (rc)
1753 return rc;
1754 }
1755
1756 return 0;
1757}
1758
1759/* Check whether a task can perform a filesystem operation. */
David Howells88e67f32008-11-14 10:39:21 +11001760static int superblock_has_perm(const struct cred *cred,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001761 struct super_block *sb,
1762 u32 perms,
1763 struct avc_audit_data *ad)
1764{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001765 struct superblock_security_struct *sbsec;
David Howells88e67f32008-11-14 10:39:21 +11001766 u32 sid = cred_sid(cred);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001767
Linus Torvalds1da177e2005-04-16 15:20:36 -07001768 sbsec = sb->s_security;
David Howells275bb412008-11-14 10:39:19 +11001769 return avc_has_perm(sid, sbsec->sid, SECCLASS_FILESYSTEM, perms, ad);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001770}
1771
1772/* Convert a Linux mode and permission mask to an access vector. */
1773static inline u32 file_mask_to_av(int mode, int mask)
1774{
1775 u32 av = 0;
1776
1777 if ((mode & S_IFMT) != S_IFDIR) {
1778 if (mask & MAY_EXEC)
1779 av |= FILE__EXECUTE;
1780 if (mask & MAY_READ)
1781 av |= FILE__READ;
1782
1783 if (mask & MAY_APPEND)
1784 av |= FILE__APPEND;
1785 else if (mask & MAY_WRITE)
1786 av |= FILE__WRITE;
1787
1788 } else {
1789 if (mask & MAY_EXEC)
1790 av |= DIR__SEARCH;
1791 if (mask & MAY_WRITE)
1792 av |= DIR__WRITE;
1793 if (mask & MAY_READ)
1794 av |= DIR__READ;
1795 }
1796
1797 return av;
1798}
1799
1800/* Convert a Linux file to an access vector. */
1801static inline u32 file_to_av(struct file *file)
1802{
1803 u32 av = 0;
1804
1805 if (file->f_mode & FMODE_READ)
1806 av |= FILE__READ;
1807 if (file->f_mode & FMODE_WRITE) {
1808 if (file->f_flags & O_APPEND)
1809 av |= FILE__APPEND;
1810 else
1811 av |= FILE__WRITE;
1812 }
Stephen Smalley0794c662008-03-17 08:55:18 -04001813 if (!av) {
1814 /*
1815 * Special file opened with flags 3 for ioctl-only use.
1816 */
1817 av = FILE__IOCTL;
1818 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001819
1820 return av;
1821}
1822
Eric Paris8b6a5a32008-10-29 17:06:46 -04001823/*
1824 * Convert a file to an access vector and include the correct open
1825 * open permission.
1826 */
1827static inline u32 open_file_to_av(struct file *file)
1828{
1829 u32 av = file_to_av(file);
1830
1831 if (selinux_policycap_openperm) {
1832 mode_t mode = file->f_path.dentry->d_inode->i_mode;
1833 /*
1834 * lnk files and socks do not really have an 'open'
1835 */
1836 if (S_ISREG(mode))
1837 av |= FILE__OPEN;
1838 else if (S_ISCHR(mode))
1839 av |= CHR_FILE__OPEN;
1840 else if (S_ISBLK(mode))
1841 av |= BLK_FILE__OPEN;
1842 else if (S_ISFIFO(mode))
1843 av |= FIFO_FILE__OPEN;
1844 else if (S_ISDIR(mode))
1845 av |= DIR__OPEN;
Eric Paris6a25b272009-03-05 13:40:35 -05001846 else if (S_ISSOCK(mode))
1847 av |= SOCK_FILE__OPEN;
Eric Paris8b6a5a32008-10-29 17:06:46 -04001848 else
1849 printk(KERN_ERR "SELinux: WARNING: inside %s with "
1850 "unknown mode:%o\n", __func__, mode);
1851 }
1852 return av;
1853}
1854
Linus Torvalds1da177e2005-04-16 15:20:36 -07001855/* Hook functions begin here. */
1856
David Howells5cd9c582008-08-14 11:37:28 +01001857static int selinux_ptrace_may_access(struct task_struct *child,
1858 unsigned int mode)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001859{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001860 int rc;
1861
Eric Paris200ac532009-02-12 15:01:04 -05001862 rc = cap_ptrace_may_access(child, mode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001863 if (rc)
1864 return rc;
1865
Stephen Smalley006ebb42008-05-19 08:32:49 -04001866 if (mode == PTRACE_MODE_READ) {
David Howells275bb412008-11-14 10:39:19 +11001867 u32 sid = current_sid();
1868 u32 csid = task_sid(child);
1869 return avc_has_perm(sid, csid, SECCLASS_FILE, FILE__READ, NULL);
Stephen Smalley006ebb42008-05-19 08:32:49 -04001870 }
1871
David Howells3b11a1d2008-11-14 10:39:26 +11001872 return current_has_perm(child, PROCESS__PTRACE);
David Howells5cd9c582008-08-14 11:37:28 +01001873}
1874
1875static int selinux_ptrace_traceme(struct task_struct *parent)
1876{
1877 int rc;
1878
Eric Paris200ac532009-02-12 15:01:04 -05001879 rc = cap_ptrace_traceme(parent);
David Howells5cd9c582008-08-14 11:37:28 +01001880 if (rc)
1881 return rc;
1882
1883 return task_has_perm(parent, current, PROCESS__PTRACE);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001884}
1885
1886static int selinux_capget(struct task_struct *target, kernel_cap_t *effective,
Eric Paris828dfe12008-04-17 13:17:49 -04001887 kernel_cap_t *inheritable, kernel_cap_t *permitted)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001888{
1889 int error;
1890
David Howells3b11a1d2008-11-14 10:39:26 +11001891 error = current_has_perm(target, PROCESS__GETCAP);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001892 if (error)
1893 return error;
1894
Eric Paris200ac532009-02-12 15:01:04 -05001895 return cap_capget(target, effective, inheritable, permitted);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001896}
1897
David Howellsd84f4f92008-11-14 10:39:23 +11001898static int selinux_capset(struct cred *new, const struct cred *old,
1899 const kernel_cap_t *effective,
1900 const kernel_cap_t *inheritable,
1901 const kernel_cap_t *permitted)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001902{
1903 int error;
1904
Eric Paris200ac532009-02-12 15:01:04 -05001905 error = cap_capset(new, old,
David Howellsd84f4f92008-11-14 10:39:23 +11001906 effective, inheritable, permitted);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001907 if (error)
1908 return error;
1909
David Howellsd84f4f92008-11-14 10:39:23 +11001910 return cred_has_perm(old, new, PROCESS__SETCAP);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001911}
1912
James Morris5626d3e2009-01-30 10:05:06 +11001913/*
1914 * (This comment used to live with the selinux_task_setuid hook,
1915 * which was removed).
1916 *
1917 * Since setuid only affects the current process, and since the SELinux
1918 * controls are not based on the Linux identity attributes, SELinux does not
1919 * need to control this operation. However, SELinux does control the use of
1920 * the CAP_SETUID and CAP_SETGID capabilities using the capable hook.
1921 */
1922
David Howells3699c532009-01-06 22:27:01 +00001923static int selinux_capable(struct task_struct *tsk, const struct cred *cred,
1924 int cap, int audit)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001925{
1926 int rc;
1927
Eric Paris200ac532009-02-12 15:01:04 -05001928 rc = cap_capable(tsk, cred, cap, audit);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001929 if (rc)
1930 return rc;
1931
David Howells3699c532009-01-06 22:27:01 +00001932 return task_has_capability(tsk, cred, cap, audit);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001933}
1934
Eric W. Biederman3fbfa982007-02-14 00:34:14 -08001935static int selinux_sysctl_get_sid(ctl_table *table, u16 tclass, u32 *sid)
1936{
1937 int buflen, rc;
1938 char *buffer, *path, *end;
1939
1940 rc = -ENOMEM;
Eric Paris828dfe12008-04-17 13:17:49 -04001941 buffer = (char *)__get_free_page(GFP_KERNEL);
Eric W. Biederman3fbfa982007-02-14 00:34:14 -08001942 if (!buffer)
1943 goto out;
1944
1945 buflen = PAGE_SIZE;
1946 end = buffer+buflen;
1947 *--end = '\0';
1948 buflen--;
1949 path = end-1;
1950 *path = '/';
1951 while (table) {
1952 const char *name = table->procname;
1953 size_t namelen = strlen(name);
1954 buflen -= namelen + 1;
1955 if (buflen < 0)
1956 goto out_free;
1957 end -= namelen;
1958 memcpy(end, name, namelen);
1959 *--end = '/';
1960 path = end;
1961 table = table->parent;
1962 }
Eric W. Biedermanb599fdf2007-02-14 00:34:15 -08001963 buflen -= 4;
1964 if (buflen < 0)
1965 goto out_free;
1966 end -= 4;
1967 memcpy(end, "/sys", 4);
1968 path = end;
Eric W. Biederman3fbfa982007-02-14 00:34:14 -08001969 rc = security_genfs_sid("proc", path, tclass, sid);
1970out_free:
1971 free_page((unsigned long)buffer);
1972out:
1973 return rc;
1974}
1975
Linus Torvalds1da177e2005-04-16 15:20:36 -07001976static int selinux_sysctl(ctl_table *table, int op)
1977{
1978 int error = 0;
1979 u32 av;
David Howells275bb412008-11-14 10:39:19 +11001980 u32 tsid, sid;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001981 int rc;
1982
David Howells275bb412008-11-14 10:39:19 +11001983 sid = current_sid();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001984
Eric W. Biederman3fbfa982007-02-14 00:34:14 -08001985 rc = selinux_sysctl_get_sid(table, (op == 0001) ?
1986 SECCLASS_DIR : SECCLASS_FILE, &tsid);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001987 if (rc) {
1988 /* Default to the well-defined sysctl SID. */
1989 tsid = SECINITSID_SYSCTL;
1990 }
1991
1992 /* The op values are "defined" in sysctl.c, thereby creating
1993 * a bad coupling between this module and sysctl.c */
Eric Paris828dfe12008-04-17 13:17:49 -04001994 if (op == 001) {
David Howells275bb412008-11-14 10:39:19 +11001995 error = avc_has_perm(sid, tsid,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001996 SECCLASS_DIR, DIR__SEARCH, NULL);
1997 } else {
1998 av = 0;
1999 if (op & 004)
2000 av |= FILE__READ;
2001 if (op & 002)
2002 av |= FILE__WRITE;
2003 if (av)
David Howells275bb412008-11-14 10:39:19 +11002004 error = avc_has_perm(sid, tsid,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002005 SECCLASS_FILE, av, NULL);
Eric Paris828dfe12008-04-17 13:17:49 -04002006 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002007
2008 return error;
2009}
2010
2011static int selinux_quotactl(int cmds, int type, int id, struct super_block *sb)
2012{
David Howells88e67f32008-11-14 10:39:21 +11002013 const struct cred *cred = current_cred();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002014 int rc = 0;
2015
2016 if (!sb)
2017 return 0;
2018
2019 switch (cmds) {
Eric Paris828dfe12008-04-17 13:17:49 -04002020 case Q_SYNC:
2021 case Q_QUOTAON:
2022 case Q_QUOTAOFF:
2023 case Q_SETINFO:
2024 case Q_SETQUOTA:
David Howells88e67f32008-11-14 10:39:21 +11002025 rc = superblock_has_perm(cred, sb, FILESYSTEM__QUOTAMOD, NULL);
Eric Paris828dfe12008-04-17 13:17:49 -04002026 break;
2027 case Q_GETFMT:
2028 case Q_GETINFO:
2029 case Q_GETQUOTA:
David Howells88e67f32008-11-14 10:39:21 +11002030 rc = superblock_has_perm(cred, sb, FILESYSTEM__QUOTAGET, NULL);
Eric Paris828dfe12008-04-17 13:17:49 -04002031 break;
2032 default:
2033 rc = 0; /* let the kernel handle invalid cmds */
2034 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002035 }
2036 return rc;
2037}
2038
2039static int selinux_quota_on(struct dentry *dentry)
2040{
David Howells88e67f32008-11-14 10:39:21 +11002041 const struct cred *cred = current_cred();
2042
2043 return dentry_has_perm(cred, NULL, dentry, FILE__QUOTAON);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002044}
2045
2046static int selinux_syslog(int type)
2047{
2048 int rc;
2049
Eric Paris200ac532009-02-12 15:01:04 -05002050 rc = cap_syslog(type);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002051 if (rc)
2052 return rc;
2053
2054 switch (type) {
Eric Paris828dfe12008-04-17 13:17:49 -04002055 case 3: /* Read last kernel messages */
2056 case 10: /* Return size of the log buffer */
2057 rc = task_has_system(current, SYSTEM__SYSLOG_READ);
2058 break;
2059 case 6: /* Disable logging to console */
2060 case 7: /* Enable logging to console */
2061 case 8: /* Set level of messages printed to console */
2062 rc = task_has_system(current, SYSTEM__SYSLOG_CONSOLE);
2063 break;
2064 case 0: /* Close log */
2065 case 1: /* Open log */
2066 case 2: /* Read from log */
2067 case 4: /* Read/clear last kernel messages */
2068 case 5: /* Clear ring buffer */
2069 default:
2070 rc = task_has_system(current, SYSTEM__SYSLOG_MOD);
2071 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002072 }
2073 return rc;
2074}
2075
2076/*
2077 * Check that a process has enough memory to allocate a new virtual
2078 * mapping. 0 means there is enough memory for the allocation to
2079 * succeed and -ENOMEM implies there is not.
2080 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07002081 * Do not audit the selinux permission check, as this is applied to all
2082 * processes that allocate mappings.
2083 */
Alan Cox34b4e4a2007-08-22 14:01:28 -07002084static int selinux_vm_enough_memory(struct mm_struct *mm, long pages)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002085{
2086 int rc, cap_sys_admin = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002087
David Howells3699c532009-01-06 22:27:01 +00002088 rc = selinux_capable(current, current_cred(), CAP_SYS_ADMIN,
2089 SECURITY_CAP_NOAUDIT);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002090 if (rc == 0)
2091 cap_sys_admin = 1;
2092
Alan Cox34b4e4a2007-08-22 14:01:28 -07002093 return __vm_enough_memory(mm, pages, cap_sys_admin);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002094}
2095
2096/* binprm security operations */
2097
David Howellsa6f76f22008-11-14 10:39:24 +11002098static int selinux_bprm_set_creds(struct linux_binprm *bprm)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002099{
David Howellsa6f76f22008-11-14 10:39:24 +11002100 const struct task_security_struct *old_tsec;
2101 struct task_security_struct *new_tsec;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002102 struct inode_security_struct *isec;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002103 struct avc_audit_data ad;
David Howellsa6f76f22008-11-14 10:39:24 +11002104 struct inode *inode = bprm->file->f_path.dentry->d_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002105 int rc;
2106
Eric Paris200ac532009-02-12 15:01:04 -05002107 rc = cap_bprm_set_creds(bprm);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002108 if (rc)
2109 return rc;
2110
David Howellsa6f76f22008-11-14 10:39:24 +11002111 /* SELinux context only depends on initial program or script and not
2112 * the script interpreter */
2113 if (bprm->cred_prepared)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002114 return 0;
2115
David Howellsa6f76f22008-11-14 10:39:24 +11002116 old_tsec = current_security();
2117 new_tsec = bprm->cred->security;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002118 isec = inode->i_security;
2119
2120 /* Default to the current task SID. */
David Howellsa6f76f22008-11-14 10:39:24 +11002121 new_tsec->sid = old_tsec->sid;
2122 new_tsec->osid = old_tsec->sid;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002123
Michael LeMay28eba5b2006-06-27 02:53:42 -07002124 /* Reset fs, key, and sock SIDs on execve. */
David Howellsa6f76f22008-11-14 10:39:24 +11002125 new_tsec->create_sid = 0;
2126 new_tsec->keycreate_sid = 0;
2127 new_tsec->sockcreate_sid = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002128
David Howellsa6f76f22008-11-14 10:39:24 +11002129 if (old_tsec->exec_sid) {
2130 new_tsec->sid = old_tsec->exec_sid;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002131 /* Reset exec SID on execve. */
David Howellsa6f76f22008-11-14 10:39:24 +11002132 new_tsec->exec_sid = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002133 } else {
2134 /* Check for a default transition on this program. */
David Howellsa6f76f22008-11-14 10:39:24 +11002135 rc = security_transition_sid(old_tsec->sid, isec->sid,
2136 SECCLASS_PROCESS, &new_tsec->sid);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002137 if (rc)
2138 return rc;
2139 }
2140
2141 AVC_AUDIT_DATA_INIT(&ad, FS);
Jan Blunck44707fd2008-02-14 19:38:33 -08002142 ad.u.fs.path = bprm->file->f_path;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002143
Josef Sipek3d5ff522006-12-08 02:37:38 -08002144 if (bprm->file->f_path.mnt->mnt_flags & MNT_NOSUID)
David Howellsa6f76f22008-11-14 10:39:24 +11002145 new_tsec->sid = old_tsec->sid;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002146
David Howellsa6f76f22008-11-14 10:39:24 +11002147 if (new_tsec->sid == old_tsec->sid) {
2148 rc = avc_has_perm(old_tsec->sid, isec->sid,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002149 SECCLASS_FILE, FILE__EXECUTE_NO_TRANS, &ad);
2150 if (rc)
2151 return rc;
2152 } else {
2153 /* Check permissions for the transition. */
David Howellsa6f76f22008-11-14 10:39:24 +11002154 rc = avc_has_perm(old_tsec->sid, new_tsec->sid,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002155 SECCLASS_PROCESS, PROCESS__TRANSITION, &ad);
2156 if (rc)
2157 return rc;
2158
David Howellsa6f76f22008-11-14 10:39:24 +11002159 rc = avc_has_perm(new_tsec->sid, isec->sid,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002160 SECCLASS_FILE, FILE__ENTRYPOINT, &ad);
2161 if (rc)
2162 return rc;
2163
David Howellsa6f76f22008-11-14 10:39:24 +11002164 /* Check for shared state */
2165 if (bprm->unsafe & LSM_UNSAFE_SHARE) {
2166 rc = avc_has_perm(old_tsec->sid, new_tsec->sid,
2167 SECCLASS_PROCESS, PROCESS__SHARE,
2168 NULL);
2169 if (rc)
2170 return -EPERM;
2171 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002172
David Howellsa6f76f22008-11-14 10:39:24 +11002173 /* Make sure that anyone attempting to ptrace over a task that
2174 * changes its SID has the appropriate permit */
2175 if (bprm->unsafe &
2176 (LSM_UNSAFE_PTRACE | LSM_UNSAFE_PTRACE_CAP)) {
2177 struct task_struct *tracer;
2178 struct task_security_struct *sec;
2179 u32 ptsid = 0;
2180
2181 rcu_read_lock();
2182 tracer = tracehook_tracer_task(current);
2183 if (likely(tracer != NULL)) {
2184 sec = __task_cred(tracer)->security;
2185 ptsid = sec->sid;
2186 }
2187 rcu_read_unlock();
2188
2189 if (ptsid != 0) {
2190 rc = avc_has_perm(ptsid, new_tsec->sid,
2191 SECCLASS_PROCESS,
2192 PROCESS__PTRACE, NULL);
2193 if (rc)
2194 return -EPERM;
2195 }
2196 }
2197
2198 /* Clear any possibly unsafe personality bits on exec: */
2199 bprm->per_clear |= PER_CLEAR_ON_SETID;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002200 }
2201
Linus Torvalds1da177e2005-04-16 15:20:36 -07002202 return 0;
2203}
2204
Eric Paris828dfe12008-04-17 13:17:49 -04002205static int selinux_bprm_secureexec(struct linux_binprm *bprm)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002206{
David Howells275bb412008-11-14 10:39:19 +11002207 const struct cred *cred = current_cred();
2208 const struct task_security_struct *tsec = cred->security;
2209 u32 sid, osid;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002210 int atsecure = 0;
2211
David Howells275bb412008-11-14 10:39:19 +11002212 sid = tsec->sid;
2213 osid = tsec->osid;
2214
2215 if (osid != sid) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002216 /* Enable secure mode for SIDs transitions unless
2217 the noatsecure permission is granted between
2218 the two SIDs, i.e. ahp returns 0. */
David Howells275bb412008-11-14 10:39:19 +11002219 atsecure = avc_has_perm(osid, sid,
David Howellsa6f76f22008-11-14 10:39:24 +11002220 SECCLASS_PROCESS,
2221 PROCESS__NOATSECURE, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002222 }
2223
Eric Paris200ac532009-02-12 15:01:04 -05002224 return (atsecure || cap_bprm_secureexec(bprm));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002225}
2226
Linus Torvalds1da177e2005-04-16 15:20:36 -07002227extern struct vfsmount *selinuxfs_mount;
2228extern struct dentry *selinux_null;
2229
2230/* Derived from fs/exec.c:flush_old_files. */
David Howells745ca242008-11-14 10:39:22 +11002231static inline void flush_unauthorized_files(const struct cred *cred,
2232 struct files_struct *files)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002233{
2234 struct avc_audit_data ad;
2235 struct file *file, *devnull = NULL;
Stephen Smalleyb20c8122006-09-25 23:32:03 -07002236 struct tty_struct *tty;
Dipankar Sarmabadf1662005-09-09 13:04:10 -07002237 struct fdtable *fdt;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002238 long j = -1;
Peter Zijlstra24ec8392006-12-08 02:36:04 -08002239 int drop_tty = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002240
Peter Zijlstra24ec8392006-12-08 02:36:04 -08002241 tty = get_current_tty();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002242 if (tty) {
2243 file_list_lock();
Eric Paris37dd0bd2008-10-31 17:40:00 -04002244 if (!list_empty(&tty->tty_files)) {
2245 struct inode *inode;
2246
Linus Torvalds1da177e2005-04-16 15:20:36 -07002247 /* Revalidate access to controlling tty.
2248 Use inode_has_perm on the tty inode directly rather
2249 than using file_has_perm, as this particular open
2250 file may belong to another process and we are only
2251 interested in the inode-based check here. */
Eric Paris37dd0bd2008-10-31 17:40:00 -04002252 file = list_first_entry(&tty->tty_files, struct file, f_u.fu_list);
2253 inode = file->f_path.dentry->d_inode;
David Howells88e67f32008-11-14 10:39:21 +11002254 if (inode_has_perm(cred, inode,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002255 FILE__READ | FILE__WRITE, NULL)) {
Peter Zijlstra24ec8392006-12-08 02:36:04 -08002256 drop_tty = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002257 }
2258 }
2259 file_list_unlock();
Alan Cox452a00d2008-10-13 10:39:13 +01002260 tty_kref_put(tty);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002261 }
Eric W. Biederman98a27ba2007-05-08 00:26:56 -07002262 /* Reset controlling tty. */
2263 if (drop_tty)
2264 no_tty();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002265
2266 /* Revalidate access to inherited open files. */
2267
Eric Paris828dfe12008-04-17 13:17:49 -04002268 AVC_AUDIT_DATA_INIT(&ad, FS);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002269
2270 spin_lock(&files->file_lock);
2271 for (;;) {
2272 unsigned long set, i;
2273 int fd;
2274
2275 j++;
2276 i = j * __NFDBITS;
Dipankar Sarmabadf1662005-09-09 13:04:10 -07002277 fdt = files_fdtable(files);
Vadim Lobanovbbea9f62006-12-10 02:21:12 -08002278 if (i >= fdt->max_fds)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002279 break;
Dipankar Sarmabadf1662005-09-09 13:04:10 -07002280 set = fdt->open_fds->fds_bits[j];
Linus Torvalds1da177e2005-04-16 15:20:36 -07002281 if (!set)
2282 continue;
2283 spin_unlock(&files->file_lock);
Eric Paris828dfe12008-04-17 13:17:49 -04002284 for ( ; set ; i++, set >>= 1) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002285 if (set & 1) {
2286 file = fget(i);
2287 if (!file)
2288 continue;
David Howells88e67f32008-11-14 10:39:21 +11002289 if (file_has_perm(cred,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002290 file,
2291 file_to_av(file))) {
2292 sys_close(i);
2293 fd = get_unused_fd();
2294 if (fd != i) {
2295 if (fd >= 0)
2296 put_unused_fd(fd);
2297 fput(file);
2298 continue;
2299 }
2300 if (devnull) {
Nick Piggin095975d2006-01-08 01:02:19 -08002301 get_file(devnull);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002302 } else {
David Howells745ca242008-11-14 10:39:22 +11002303 devnull = dentry_open(
2304 dget(selinux_null),
2305 mntget(selinuxfs_mount),
2306 O_RDWR, cred);
Akinobu Mitafc5d81e2006-11-27 15:16:48 +09002307 if (IS_ERR(devnull)) {
2308 devnull = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002309 put_unused_fd(fd);
2310 fput(file);
2311 continue;
2312 }
2313 }
2314 fd_install(fd, devnull);
2315 }
2316 fput(file);
2317 }
2318 }
2319 spin_lock(&files->file_lock);
2320
2321 }
2322 spin_unlock(&files->file_lock);
2323}
2324
Linus Torvalds1da177e2005-04-16 15:20:36 -07002325/*
David Howellsa6f76f22008-11-14 10:39:24 +11002326 * Prepare a process for imminent new credential changes due to exec
Linus Torvalds1da177e2005-04-16 15:20:36 -07002327 */
David Howellsa6f76f22008-11-14 10:39:24 +11002328static void selinux_bprm_committing_creds(struct linux_binprm *bprm)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002329{
David Howellsa6f76f22008-11-14 10:39:24 +11002330 struct task_security_struct *new_tsec;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002331 struct rlimit *rlim, *initrlim;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002332 int rc, i;
2333
David Howellsa6f76f22008-11-14 10:39:24 +11002334 new_tsec = bprm->cred->security;
2335 if (new_tsec->sid == new_tsec->osid)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002336 return;
2337
2338 /* Close files for which the new task SID is not authorized. */
David Howellsa6f76f22008-11-14 10:39:24 +11002339 flush_unauthorized_files(bprm->cred, current->files);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002340
David Howellsa6f76f22008-11-14 10:39:24 +11002341 /* Always clear parent death signal on SID transitions. */
2342 current->pdeath_signal = 0;
2343
2344 /* Check whether the new SID can inherit resource limits from the old
2345 * SID. If not, reset all soft limits to the lower of the current
2346 * task's hard limit and the init task's soft limit.
2347 *
2348 * Note that the setting of hard limits (even to lower them) can be
2349 * controlled by the setrlimit check. The inclusion of the init task's
2350 * soft limit into the computation is to avoid resetting soft limits
2351 * higher than the default soft limit for cases where the default is
2352 * lower than the hard limit, e.g. RLIMIT_CORE or RLIMIT_STACK.
2353 */
2354 rc = avc_has_perm(new_tsec->osid, new_tsec->sid, SECCLASS_PROCESS,
2355 PROCESS__RLIMITINH, NULL);
2356 if (rc) {
2357 for (i = 0; i < RLIM_NLIMITS; i++) {
2358 rlim = current->signal->rlim + i;
2359 initrlim = init_task.signal->rlim + i;
2360 rlim->rlim_cur = min(rlim->rlim_max, initrlim->rlim_cur);
2361 }
2362 update_rlimit_cpu(rlim->rlim_cur);
2363 }
2364}
2365
2366/*
2367 * Clean up the process immediately after the installation of new credentials
2368 * due to exec
2369 */
2370static void selinux_bprm_committed_creds(struct linux_binprm *bprm)
2371{
2372 const struct task_security_struct *tsec = current_security();
2373 struct itimerval itimer;
David Howellsa6f76f22008-11-14 10:39:24 +11002374 u32 osid, sid;
2375 int rc, i;
David Howellsa6f76f22008-11-14 10:39:24 +11002376
David Howellsa6f76f22008-11-14 10:39:24 +11002377 osid = tsec->osid;
2378 sid = tsec->sid;
2379
2380 if (sid == osid)
2381 return;
2382
2383 /* Check whether the new SID can inherit signal state from the old SID.
2384 * If not, clear itimers to avoid subsequent signal generation and
2385 * flush and unblock signals.
2386 *
2387 * This must occur _after_ the task SID has been updated so that any
2388 * kill done after the flush will be checked against the new SID.
2389 */
2390 rc = avc_has_perm(osid, sid, SECCLASS_PROCESS, PROCESS__SIGINH, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002391 if (rc) {
2392 memset(&itimer, 0, sizeof itimer);
2393 for (i = 0; i < 3; i++)
2394 do_setitimer(i, &itimer, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002395 spin_lock_irq(&current->sighand->siglock);
David Howells3bcac022009-04-29 13:45:05 +01002396 if (!(current->signal->flags & SIGNAL_GROUP_EXIT)) {
2397 __flush_signals(current);
2398 flush_signal_handlers(current, 1);
2399 sigemptyset(&current->blocked);
2400 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002401 spin_unlock_irq(&current->sighand->siglock);
2402 }
2403
David Howellsa6f76f22008-11-14 10:39:24 +11002404 /* Wake up the parent if it is waiting so that it can recheck
2405 * wait permission to the new task SID. */
Oleg Nesterovecd6de32009-04-29 16:02:24 +02002406 read_lock(&tasklist_lock);
2407 wake_up_interruptible(&current->real_parent->signal->wait_chldexit);
2408 read_unlock(&tasklist_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002409}
2410
2411/* superblock security operations */
2412
2413static int selinux_sb_alloc_security(struct super_block *sb)
2414{
2415 return superblock_alloc_security(sb);
2416}
2417
2418static void selinux_sb_free_security(struct super_block *sb)
2419{
2420 superblock_free_security(sb);
2421}
2422
2423static inline int match_prefix(char *prefix, int plen, char *option, int olen)
2424{
2425 if (plen > olen)
2426 return 0;
2427
2428 return !memcmp(prefix, option, plen);
2429}
2430
2431static inline int selinux_option(char *option, int len)
2432{
Eric Paris832cbd92008-04-01 13:24:09 -04002433 return (match_prefix(CONTEXT_STR, sizeof(CONTEXT_STR)-1, option, len) ||
2434 match_prefix(FSCONTEXT_STR, sizeof(FSCONTEXT_STR)-1, option, len) ||
2435 match_prefix(DEFCONTEXT_STR, sizeof(DEFCONTEXT_STR)-1, option, len) ||
David P. Quigley11689d42009-01-16 09:22:03 -05002436 match_prefix(ROOTCONTEXT_STR, sizeof(ROOTCONTEXT_STR)-1, option, len) ||
2437 match_prefix(LABELSUPP_STR, sizeof(LABELSUPP_STR)-1, option, len));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002438}
2439
2440static inline void take_option(char **to, char *from, int *first, int len)
2441{
2442 if (!*first) {
2443 **to = ',';
2444 *to += 1;
Cory Olmo3528a952006-09-29 01:58:44 -07002445 } else
Linus Torvalds1da177e2005-04-16 15:20:36 -07002446 *first = 0;
2447 memcpy(*to, from, len);
2448 *to += len;
2449}
2450
Eric Paris828dfe12008-04-17 13:17:49 -04002451static inline void take_selinux_option(char **to, char *from, int *first,
2452 int len)
Cory Olmo3528a952006-09-29 01:58:44 -07002453{
2454 int current_size = 0;
2455
2456 if (!*first) {
2457 **to = '|';
2458 *to += 1;
Eric Paris828dfe12008-04-17 13:17:49 -04002459 } else
Cory Olmo3528a952006-09-29 01:58:44 -07002460 *first = 0;
2461
2462 while (current_size < len) {
2463 if (*from != '"') {
2464 **to = *from;
2465 *to += 1;
2466 }
2467 from += 1;
2468 current_size += 1;
2469 }
2470}
2471
Eric Parise0007522008-03-05 10:31:54 -05002472static int selinux_sb_copy_data(char *orig, char *copy)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002473{
2474 int fnosec, fsec, rc = 0;
2475 char *in_save, *in_curr, *in_end;
2476 char *sec_curr, *nosec_save, *nosec;
Cory Olmo3528a952006-09-29 01:58:44 -07002477 int open_quote = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002478
2479 in_curr = orig;
2480 sec_curr = copy;
2481
Linus Torvalds1da177e2005-04-16 15:20:36 -07002482 nosec = (char *)get_zeroed_page(GFP_KERNEL);
2483 if (!nosec) {
2484 rc = -ENOMEM;
2485 goto out;
2486 }
2487
2488 nosec_save = nosec;
2489 fnosec = fsec = 1;
2490 in_save = in_end = orig;
2491
2492 do {
Cory Olmo3528a952006-09-29 01:58:44 -07002493 if (*in_end == '"')
2494 open_quote = !open_quote;
2495 if ((*in_end == ',' && open_quote == 0) ||
2496 *in_end == '\0') {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002497 int len = in_end - in_curr;
2498
2499 if (selinux_option(in_curr, len))
Cory Olmo3528a952006-09-29 01:58:44 -07002500 take_selinux_option(&sec_curr, in_curr, &fsec, len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002501 else
2502 take_option(&nosec, in_curr, &fnosec, len);
2503
2504 in_curr = in_end + 1;
2505 }
2506 } while (*in_end++);
2507
Eric Paris6931dfc2005-06-30 02:58:51 -07002508 strcpy(in_save, nosec_save);
Gerald Schaeferda3caa22005-06-21 17:15:18 -07002509 free_page((unsigned long)nosec_save);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002510out:
2511 return rc;
2512}
2513
James Morris12204e22008-12-19 10:44:42 +11002514static int selinux_sb_kern_mount(struct super_block *sb, int flags, void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002515{
David Howells88e67f32008-11-14 10:39:21 +11002516 const struct cred *cred = current_cred();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002517 struct avc_audit_data ad;
2518 int rc;
2519
2520 rc = superblock_doinit(sb, data);
2521 if (rc)
2522 return rc;
2523
James Morris74192242008-12-19 11:41:10 +11002524 /* Allow all mounts performed by the kernel */
2525 if (flags & MS_KERNMOUNT)
2526 return 0;
2527
Eric Paris828dfe12008-04-17 13:17:49 -04002528 AVC_AUDIT_DATA_INIT(&ad, FS);
Jan Blunck44707fd2008-02-14 19:38:33 -08002529 ad.u.fs.path.dentry = sb->s_root;
David Howells88e67f32008-11-14 10:39:21 +11002530 return superblock_has_perm(cred, sb, FILESYSTEM__MOUNT, &ad);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002531}
2532
David Howells726c3342006-06-23 02:02:58 -07002533static int selinux_sb_statfs(struct dentry *dentry)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002534{
David Howells88e67f32008-11-14 10:39:21 +11002535 const struct cred *cred = current_cred();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002536 struct avc_audit_data ad;
2537
Eric Paris828dfe12008-04-17 13:17:49 -04002538 AVC_AUDIT_DATA_INIT(&ad, FS);
Jan Blunck44707fd2008-02-14 19:38:33 -08002539 ad.u.fs.path.dentry = dentry->d_sb->s_root;
David Howells88e67f32008-11-14 10:39:21 +11002540 return superblock_has_perm(cred, dentry->d_sb, FILESYSTEM__GETATTR, &ad);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002541}
2542
Eric Paris828dfe12008-04-17 13:17:49 -04002543static int selinux_mount(char *dev_name,
Al Virob5266eb2008-03-22 17:48:24 -04002544 struct path *path,
Eric Paris828dfe12008-04-17 13:17:49 -04002545 char *type,
2546 unsigned long flags,
2547 void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002548{
David Howells88e67f32008-11-14 10:39:21 +11002549 const struct cred *cred = current_cred();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002550
2551 if (flags & MS_REMOUNT)
David Howells88e67f32008-11-14 10:39:21 +11002552 return superblock_has_perm(cred, path->mnt->mnt_sb,
Eric Paris828dfe12008-04-17 13:17:49 -04002553 FILESYSTEM__REMOUNT, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002554 else
David Howells88e67f32008-11-14 10:39:21 +11002555 return dentry_has_perm(cred, path->mnt, path->dentry,
Eric Paris828dfe12008-04-17 13:17:49 -04002556 FILE__MOUNTON);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002557}
2558
2559static int selinux_umount(struct vfsmount *mnt, int flags)
2560{
David Howells88e67f32008-11-14 10:39:21 +11002561 const struct cred *cred = current_cred();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002562
David Howells88e67f32008-11-14 10:39:21 +11002563 return superblock_has_perm(cred, mnt->mnt_sb,
Eric Paris828dfe12008-04-17 13:17:49 -04002564 FILESYSTEM__UNMOUNT, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002565}
2566
2567/* inode security operations */
2568
2569static int selinux_inode_alloc_security(struct inode *inode)
2570{
2571 return inode_alloc_security(inode);
2572}
2573
2574static void selinux_inode_free_security(struct inode *inode)
2575{
2576 inode_free_security(inode);
2577}
2578
Stephen Smalley5e41ff92005-09-09 13:01:35 -07002579static int selinux_inode_init_security(struct inode *inode, struct inode *dir,
2580 char **name, void **value,
2581 size_t *len)
2582{
David Howells275bb412008-11-14 10:39:19 +11002583 const struct cred *cred = current_cred();
2584 const struct task_security_struct *tsec = cred->security;
Stephen Smalley5e41ff92005-09-09 13:01:35 -07002585 struct inode_security_struct *dsec;
2586 struct superblock_security_struct *sbsec;
David Howells275bb412008-11-14 10:39:19 +11002587 u32 sid, newsid, clen;
Stephen Smalley5e41ff92005-09-09 13:01:35 -07002588 int rc;
Stephen Smalley570bc1c2005-09-09 13:01:43 -07002589 char *namep = NULL, *context;
Stephen Smalley5e41ff92005-09-09 13:01:35 -07002590
Stephen Smalley5e41ff92005-09-09 13:01:35 -07002591 dsec = dir->i_security;
2592 sbsec = dir->i_sb->s_security;
Stephen Smalley5e41ff92005-09-09 13:01:35 -07002593
David Howells275bb412008-11-14 10:39:19 +11002594 sid = tsec->sid;
2595 newsid = tsec->create_sid;
2596
David P. Quigleycd895962009-01-16 09:22:04 -05002597 if (!newsid || !(sbsec->flags & SE_SBLABELSUPP)) {
David Howells275bb412008-11-14 10:39:19 +11002598 rc = security_transition_sid(sid, dsec->sid,
Stephen Smalley5e41ff92005-09-09 13:01:35 -07002599 inode_mode_to_security_class(inode->i_mode),
2600 &newsid);
2601 if (rc) {
2602 printk(KERN_WARNING "%s: "
2603 "security_transition_sid failed, rc=%d (dev=%s "
2604 "ino=%ld)\n",
Harvey Harrisondd6f9532008-03-06 10:03:59 +11002605 __func__,
Stephen Smalley5e41ff92005-09-09 13:01:35 -07002606 -rc, inode->i_sb->s_id, inode->i_ino);
2607 return rc;
2608 }
2609 }
2610
Eric Paris296fddf2006-09-25 23:32:00 -07002611 /* Possibly defer initialization to selinux_complete_init. */
David P. Quigley0d90a7e2009-01-16 09:22:02 -05002612 if (sbsec->flags & SE_SBINITIALIZED) {
Eric Paris296fddf2006-09-25 23:32:00 -07002613 struct inode_security_struct *isec = inode->i_security;
2614 isec->sclass = inode_mode_to_security_class(inode->i_mode);
2615 isec->sid = newsid;
2616 isec->initialized = 1;
2617 }
Stephen Smalley5e41ff92005-09-09 13:01:35 -07002618
David P. Quigleycd895962009-01-16 09:22:04 -05002619 if (!ss_initialized || !(sbsec->flags & SE_SBLABELSUPP))
Stephen Smalley25a74f32005-11-08 21:34:33 -08002620 return -EOPNOTSUPP;
2621
Stephen Smalley570bc1c2005-09-09 13:01:43 -07002622 if (name) {
Josef Bacika02fe132008-04-04 09:35:05 +11002623 namep = kstrdup(XATTR_SELINUX_SUFFIX, GFP_NOFS);
Stephen Smalley570bc1c2005-09-09 13:01:43 -07002624 if (!namep)
2625 return -ENOMEM;
2626 *name = namep;
Stephen Smalley5e41ff92005-09-09 13:01:35 -07002627 }
Stephen Smalley570bc1c2005-09-09 13:01:43 -07002628
2629 if (value && len) {
Stephen Smalley12b29f32008-05-07 13:03:20 -04002630 rc = security_sid_to_context_force(newsid, &context, &clen);
Stephen Smalley570bc1c2005-09-09 13:01:43 -07002631 if (rc) {
2632 kfree(namep);
2633 return rc;
2634 }
2635 *value = context;
2636 *len = clen;
2637 }
Stephen Smalley5e41ff92005-09-09 13:01:35 -07002638
Stephen Smalley5e41ff92005-09-09 13:01:35 -07002639 return 0;
2640}
2641
Linus Torvalds1da177e2005-04-16 15:20:36 -07002642static int selinux_inode_create(struct inode *dir, struct dentry *dentry, int mask)
2643{
2644 return may_create(dir, dentry, SECCLASS_FILE);
2645}
2646
Linus Torvalds1da177e2005-04-16 15:20:36 -07002647static int selinux_inode_link(struct dentry *old_dentry, struct inode *dir, struct dentry *new_dentry)
2648{
Linus Torvalds1da177e2005-04-16 15:20:36 -07002649 return may_link(dir, old_dentry, MAY_LINK);
2650}
2651
Linus Torvalds1da177e2005-04-16 15:20:36 -07002652static int selinux_inode_unlink(struct inode *dir, struct dentry *dentry)
2653{
Linus Torvalds1da177e2005-04-16 15:20:36 -07002654 return may_link(dir, dentry, MAY_UNLINK);
2655}
2656
2657static int selinux_inode_symlink(struct inode *dir, struct dentry *dentry, const char *name)
2658{
2659 return may_create(dir, dentry, SECCLASS_LNK_FILE);
2660}
2661
Linus Torvalds1da177e2005-04-16 15:20:36 -07002662static int selinux_inode_mkdir(struct inode *dir, struct dentry *dentry, int mask)
2663{
2664 return may_create(dir, dentry, SECCLASS_DIR);
2665}
2666
Linus Torvalds1da177e2005-04-16 15:20:36 -07002667static int selinux_inode_rmdir(struct inode *dir, struct dentry *dentry)
2668{
2669 return may_link(dir, dentry, MAY_RMDIR);
2670}
2671
2672static int selinux_inode_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev)
2673{
Linus Torvalds1da177e2005-04-16 15:20:36 -07002674 return may_create(dir, dentry, inode_mode_to_security_class(mode));
2675}
2676
Linus Torvalds1da177e2005-04-16 15:20:36 -07002677static int selinux_inode_rename(struct inode *old_inode, struct dentry *old_dentry,
Eric Paris828dfe12008-04-17 13:17:49 -04002678 struct inode *new_inode, struct dentry *new_dentry)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002679{
2680 return may_rename(old_inode, old_dentry, new_inode, new_dentry);
2681}
2682
Linus Torvalds1da177e2005-04-16 15:20:36 -07002683static int selinux_inode_readlink(struct dentry *dentry)
2684{
David Howells88e67f32008-11-14 10:39:21 +11002685 const struct cred *cred = current_cred();
2686
2687 return dentry_has_perm(cred, NULL, dentry, FILE__READ);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002688}
2689
2690static int selinux_inode_follow_link(struct dentry *dentry, struct nameidata *nameidata)
2691{
David Howells88e67f32008-11-14 10:39:21 +11002692 const struct cred *cred = current_cred();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002693
David Howells88e67f32008-11-14 10:39:21 +11002694 return dentry_has_perm(cred, NULL, dentry, FILE__READ);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002695}
2696
Al Virob77b0642008-07-17 09:37:02 -04002697static int selinux_inode_permission(struct inode *inode, int mask)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002698{
David Howells88e67f32008-11-14 10:39:21 +11002699 const struct cred *cred = current_cred();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002700
2701 if (!mask) {
2702 /* No permission to check. Existence test. */
2703 return 0;
2704 }
2705
David Howells88e67f32008-11-14 10:39:21 +11002706 return inode_has_perm(cred, inode,
Eric Paris8b6a5a32008-10-29 17:06:46 -04002707 file_mask_to_av(inode->i_mode, mask), NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002708}
2709
2710static int selinux_inode_setattr(struct dentry *dentry, struct iattr *iattr)
2711{
David Howells88e67f32008-11-14 10:39:21 +11002712 const struct cred *cred = current_cred();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002713
2714 if (iattr->ia_valid & ATTR_FORCE)
2715 return 0;
2716
2717 if (iattr->ia_valid & (ATTR_MODE | ATTR_UID | ATTR_GID |
2718 ATTR_ATIME_SET | ATTR_MTIME_SET))
David Howells88e67f32008-11-14 10:39:21 +11002719 return dentry_has_perm(cred, NULL, dentry, FILE__SETATTR);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002720
David Howells88e67f32008-11-14 10:39:21 +11002721 return dentry_has_perm(cred, NULL, dentry, FILE__WRITE);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002722}
2723
2724static int selinux_inode_getattr(struct vfsmount *mnt, struct dentry *dentry)
2725{
David Howells88e67f32008-11-14 10:39:21 +11002726 const struct cred *cred = current_cred();
2727
2728 return dentry_has_perm(cred, mnt, dentry, FILE__GETATTR);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002729}
2730
David Howells8f0cfa52008-04-29 00:59:41 -07002731static int selinux_inode_setotherxattr(struct dentry *dentry, const char *name)
Serge E. Hallynb5376772007-10-16 23:31:36 -07002732{
David Howells88e67f32008-11-14 10:39:21 +11002733 const struct cred *cred = current_cred();
2734
Serge E. Hallynb5376772007-10-16 23:31:36 -07002735 if (!strncmp(name, XATTR_SECURITY_PREFIX,
2736 sizeof XATTR_SECURITY_PREFIX - 1)) {
2737 if (!strcmp(name, XATTR_NAME_CAPS)) {
2738 if (!capable(CAP_SETFCAP))
2739 return -EPERM;
2740 } else if (!capable(CAP_SYS_ADMIN)) {
2741 /* A different attribute in the security namespace.
2742 Restrict to administrator. */
2743 return -EPERM;
2744 }
2745 }
2746
2747 /* Not an attribute we recognize, so just check the
2748 ordinary setattr permission. */
David Howells88e67f32008-11-14 10:39:21 +11002749 return dentry_has_perm(cred, NULL, dentry, FILE__SETATTR);
Serge E. Hallynb5376772007-10-16 23:31:36 -07002750}
2751
David Howells8f0cfa52008-04-29 00:59:41 -07002752static int selinux_inode_setxattr(struct dentry *dentry, const char *name,
2753 const void *value, size_t size, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002754{
Linus Torvalds1da177e2005-04-16 15:20:36 -07002755 struct inode *inode = dentry->d_inode;
2756 struct inode_security_struct *isec = inode->i_security;
2757 struct superblock_security_struct *sbsec;
2758 struct avc_audit_data ad;
David Howells275bb412008-11-14 10:39:19 +11002759 u32 newsid, sid = current_sid();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002760 int rc = 0;
2761
Serge E. Hallynb5376772007-10-16 23:31:36 -07002762 if (strcmp(name, XATTR_NAME_SELINUX))
2763 return selinux_inode_setotherxattr(dentry, name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002764
2765 sbsec = inode->i_sb->s_security;
David P. Quigleycd895962009-01-16 09:22:04 -05002766 if (!(sbsec->flags & SE_SBLABELSUPP))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002767 return -EOPNOTSUPP;
2768
Satyam Sharma3bd858a2007-07-17 15:00:08 +05302769 if (!is_owner_or_cap(inode))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002770 return -EPERM;
2771
Eric Paris828dfe12008-04-17 13:17:49 -04002772 AVC_AUDIT_DATA_INIT(&ad, FS);
Jan Blunck44707fd2008-02-14 19:38:33 -08002773 ad.u.fs.path.dentry = dentry;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002774
David Howells275bb412008-11-14 10:39:19 +11002775 rc = avc_has_perm(sid, isec->sid, isec->sclass,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002776 FILE__RELABELFROM, &ad);
2777 if (rc)
2778 return rc;
2779
2780 rc = security_context_to_sid(value, size, &newsid);
Stephen Smalley12b29f32008-05-07 13:03:20 -04002781 if (rc == -EINVAL) {
2782 if (!capable(CAP_MAC_ADMIN))
2783 return rc;
2784 rc = security_context_to_sid_force(value, size, &newsid);
2785 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002786 if (rc)
2787 return rc;
2788
David Howells275bb412008-11-14 10:39:19 +11002789 rc = avc_has_perm(sid, newsid, isec->sclass,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002790 FILE__RELABELTO, &ad);
2791 if (rc)
2792 return rc;
2793
David Howells275bb412008-11-14 10:39:19 +11002794 rc = security_validate_transition(isec->sid, newsid, sid,
Eric Paris828dfe12008-04-17 13:17:49 -04002795 isec->sclass);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002796 if (rc)
2797 return rc;
2798
2799 return avc_has_perm(newsid,
2800 sbsec->sid,
2801 SECCLASS_FILESYSTEM,
2802 FILESYSTEM__ASSOCIATE,
2803 &ad);
2804}
2805
David Howells8f0cfa52008-04-29 00:59:41 -07002806static void selinux_inode_post_setxattr(struct dentry *dentry, const char *name,
Eric Parisf5269712008-05-14 11:27:45 -04002807 const void *value, size_t size,
David Howells8f0cfa52008-04-29 00:59:41 -07002808 int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002809{
2810 struct inode *inode = dentry->d_inode;
2811 struct inode_security_struct *isec = inode->i_security;
2812 u32 newsid;
2813 int rc;
2814
2815 if (strcmp(name, XATTR_NAME_SELINUX)) {
2816 /* Not an attribute we recognize, so nothing to do. */
2817 return;
2818 }
2819
Stephen Smalley12b29f32008-05-07 13:03:20 -04002820 rc = security_context_to_sid_force(value, size, &newsid);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002821 if (rc) {
Stephen Smalley12b29f32008-05-07 13:03:20 -04002822 printk(KERN_ERR "SELinux: unable to map context to SID"
2823 "for (%s, %lu), rc=%d\n",
2824 inode->i_sb->s_id, inode->i_ino, -rc);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002825 return;
2826 }
2827
2828 isec->sid = newsid;
2829 return;
2830}
2831
David Howells8f0cfa52008-04-29 00:59:41 -07002832static int selinux_inode_getxattr(struct dentry *dentry, const char *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002833{
David Howells88e67f32008-11-14 10:39:21 +11002834 const struct cred *cred = current_cred();
2835
2836 return dentry_has_perm(cred, NULL, dentry, FILE__GETATTR);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002837}
2838
Eric Paris828dfe12008-04-17 13:17:49 -04002839static int selinux_inode_listxattr(struct dentry *dentry)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002840{
David Howells88e67f32008-11-14 10:39:21 +11002841 const struct cred *cred = current_cred();
2842
2843 return dentry_has_perm(cred, NULL, dentry, FILE__GETATTR);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002844}
2845
David Howells8f0cfa52008-04-29 00:59:41 -07002846static int selinux_inode_removexattr(struct dentry *dentry, const char *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002847{
Serge E. Hallynb5376772007-10-16 23:31:36 -07002848 if (strcmp(name, XATTR_NAME_SELINUX))
2849 return selinux_inode_setotherxattr(dentry, name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002850
2851 /* No one is allowed to remove a SELinux security label.
2852 You can change the label, but all data must be labeled. */
2853 return -EACCES;
2854}
2855
James Morrisd381d8a2005-10-30 14:59:22 -08002856/*
Stephen Smalleyabc69bb2008-05-21 14:16:12 -04002857 * Copy the inode security context value to the user.
James Morrisd381d8a2005-10-30 14:59:22 -08002858 *
2859 * Permission check is handled by selinux_inode_getxattr hook.
2860 */
David P. Quigley42492592008-02-04 22:29:39 -08002861static int selinux_inode_getsecurity(const struct inode *inode, const char *name, void **buffer, bool alloc)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002862{
David P. Quigley42492592008-02-04 22:29:39 -08002863 u32 size;
2864 int error;
2865 char *context = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002866 struct inode_security_struct *isec = inode->i_security;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002867
Dustin Kirkland8c8570f2005-11-03 17:15:16 +00002868 if (strcmp(name, XATTR_SELINUX_SUFFIX))
2869 return -EOPNOTSUPP;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002870
Stephen Smalleyabc69bb2008-05-21 14:16:12 -04002871 /*
2872 * If the caller has CAP_MAC_ADMIN, then get the raw context
2873 * value even if it is not defined by current policy; otherwise,
2874 * use the in-core value under current policy.
2875 * Use the non-auditing forms of the permission checks since
2876 * getxattr may be called by unprivileged processes commonly
2877 * and lack of permission just means that we fall back to the
2878 * in-core context value, not a denial.
2879 */
David Howells3699c532009-01-06 22:27:01 +00002880 error = selinux_capable(current, current_cred(), CAP_MAC_ADMIN,
2881 SECURITY_CAP_NOAUDIT);
Stephen Smalleyabc69bb2008-05-21 14:16:12 -04002882 if (!error)
2883 error = security_sid_to_context_force(isec->sid, &context,
2884 &size);
2885 else
2886 error = security_sid_to_context(isec->sid, &context, &size);
David P. Quigley42492592008-02-04 22:29:39 -08002887 if (error)
2888 return error;
2889 error = size;
2890 if (alloc) {
2891 *buffer = context;
2892 goto out_nofree;
2893 }
2894 kfree(context);
2895out_nofree:
2896 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002897}
2898
2899static int selinux_inode_setsecurity(struct inode *inode, const char *name,
Eric Paris828dfe12008-04-17 13:17:49 -04002900 const void *value, size_t size, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002901{
2902 struct inode_security_struct *isec = inode->i_security;
2903 u32 newsid;
2904 int rc;
2905
2906 if (strcmp(name, XATTR_SELINUX_SUFFIX))
2907 return -EOPNOTSUPP;
2908
2909 if (!value || !size)
2910 return -EACCES;
2911
Eric Paris828dfe12008-04-17 13:17:49 -04002912 rc = security_context_to_sid((void *)value, size, &newsid);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002913 if (rc)
2914 return rc;
2915
2916 isec->sid = newsid;
2917 return 0;
2918}
2919
2920static int selinux_inode_listsecurity(struct inode *inode, char *buffer, size_t buffer_size)
2921{
2922 const int len = sizeof(XATTR_NAME_SELINUX);
2923 if (buffer && len <= buffer_size)
2924 memcpy(buffer, XATTR_NAME_SELINUX, len);
2925 return len;
2926}
2927
Ahmed S. Darwish713a04ae2008-03-01 21:52:30 +02002928static void selinux_inode_getsecid(const struct inode *inode, u32 *secid)
2929{
2930 struct inode_security_struct *isec = inode->i_security;
2931 *secid = isec->sid;
2932}
2933
Linus Torvalds1da177e2005-04-16 15:20:36 -07002934/* file security operations */
2935
Yuichi Nakamura788e7dd2007-09-14 09:27:07 +09002936static int selinux_revalidate_file_permission(struct file *file, int mask)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002937{
David Howells88e67f32008-11-14 10:39:21 +11002938 const struct cred *cred = current_cred();
Josef Sipek3d5ff522006-12-08 02:37:38 -08002939 struct inode *inode = file->f_path.dentry->d_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002940
Linus Torvalds1da177e2005-04-16 15:20:36 -07002941 /* file_mask_to_av won't add FILE__WRITE if MAY_APPEND is set */
2942 if ((file->f_flags & O_APPEND) && (mask & MAY_WRITE))
2943 mask |= MAY_APPEND;
2944
Paul Moore389fb8002009-03-27 17:10:34 -04002945 return file_has_perm(cred, file,
2946 file_mask_to_av(inode->i_mode, mask));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002947}
2948
Yuichi Nakamura788e7dd2007-09-14 09:27:07 +09002949static int selinux_file_permission(struct file *file, int mask)
2950{
Stephen Smalley20dda182009-06-22 14:54:53 -04002951 struct inode *inode = file->f_path.dentry->d_inode;
2952 struct file_security_struct *fsec = file->f_security;
2953 struct inode_security_struct *isec = inode->i_security;
2954 u32 sid = current_sid();
2955
Paul Moore389fb8002009-03-27 17:10:34 -04002956 if (!mask)
Yuichi Nakamura788e7dd2007-09-14 09:27:07 +09002957 /* No permission to check. Existence test. */
2958 return 0;
Yuichi Nakamura788e7dd2007-09-14 09:27:07 +09002959
Stephen Smalley20dda182009-06-22 14:54:53 -04002960 if (sid == fsec->sid && fsec->isid == isec->sid &&
2961 fsec->pseqno == avc_policy_seqno())
2962 /* No change since dentry_open check. */
2963 return 0;
2964
Yuichi Nakamura788e7dd2007-09-14 09:27:07 +09002965 return selinux_revalidate_file_permission(file, mask);
2966}
2967
Linus Torvalds1da177e2005-04-16 15:20:36 -07002968static int selinux_file_alloc_security(struct file *file)
2969{
2970 return file_alloc_security(file);
2971}
2972
2973static void selinux_file_free_security(struct file *file)
2974{
2975 file_free_security(file);
2976}
2977
2978static int selinux_file_ioctl(struct file *file, unsigned int cmd,
2979 unsigned long arg)
2980{
David Howells88e67f32008-11-14 10:39:21 +11002981 const struct cred *cred = current_cred();
Stephen Smalley242631c2008-06-05 09:21:28 -04002982 u32 av = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002983
Stephen Smalley242631c2008-06-05 09:21:28 -04002984 if (_IOC_DIR(cmd) & _IOC_WRITE)
2985 av |= FILE__WRITE;
2986 if (_IOC_DIR(cmd) & _IOC_READ)
2987 av |= FILE__READ;
2988 if (!av)
2989 av = FILE__IOCTL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002990
David Howells88e67f32008-11-14 10:39:21 +11002991 return file_has_perm(cred, file, av);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002992}
2993
2994static int file_map_prot_check(struct file *file, unsigned long prot, int shared)
2995{
David Howells88e67f32008-11-14 10:39:21 +11002996 const struct cred *cred = current_cred();
David Howellsd84f4f92008-11-14 10:39:23 +11002997 int rc = 0;
David Howells88e67f32008-11-14 10:39:21 +11002998
Linus Torvalds1da177e2005-04-16 15:20:36 -07002999#ifndef CONFIG_PPC32
3000 if ((prot & PROT_EXEC) && (!file || (!shared && (prot & PROT_WRITE)))) {
3001 /*
3002 * We are making executable an anonymous mapping or a
3003 * private file mapping that will also be writable.
3004 * This has an additional check.
3005 */
David Howellsd84f4f92008-11-14 10:39:23 +11003006 rc = cred_has_perm(cred, cred, PROCESS__EXECMEM);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003007 if (rc)
David Howellsd84f4f92008-11-14 10:39:23 +11003008 goto error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003009 }
3010#endif
3011
3012 if (file) {
3013 /* read access is always possible with a mapping */
3014 u32 av = FILE__READ;
3015
3016 /* write access only matters if the mapping is shared */
3017 if (shared && (prot & PROT_WRITE))
3018 av |= FILE__WRITE;
3019
3020 if (prot & PROT_EXEC)
3021 av |= FILE__EXECUTE;
3022
David Howells88e67f32008-11-14 10:39:21 +11003023 return file_has_perm(cred, file, av);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003024 }
David Howellsd84f4f92008-11-14 10:39:23 +11003025
3026error:
3027 return rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003028}
3029
3030static int selinux_file_mmap(struct file *file, unsigned long reqprot,
Eric Parised032182007-06-28 15:55:21 -04003031 unsigned long prot, unsigned long flags,
3032 unsigned long addr, unsigned long addr_only)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003033{
Eric Parised032182007-06-28 15:55:21 -04003034 int rc = 0;
David Howells275bb412008-11-14 10:39:19 +11003035 u32 sid = current_sid();
Linus Torvalds1da177e2005-04-16 15:20:36 -07003036
Eric Parised032182007-06-28 15:55:21 -04003037 if (addr < mmap_min_addr)
3038 rc = avc_has_perm(sid, sid, SECCLASS_MEMPROTECT,
3039 MEMPROTECT__MMAP_ZERO, NULL);
3040 if (rc || addr_only)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003041 return rc;
3042
3043 if (selinux_checkreqprot)
3044 prot = reqprot;
3045
3046 return file_map_prot_check(file, prot,
3047 (flags & MAP_TYPE) == MAP_SHARED);
3048}
3049
3050static int selinux_file_mprotect(struct vm_area_struct *vma,
3051 unsigned long reqprot,
3052 unsigned long prot)
3053{
David Howells88e67f32008-11-14 10:39:21 +11003054 const struct cred *cred = current_cred();
Linus Torvalds1da177e2005-04-16 15:20:36 -07003055
3056 if (selinux_checkreqprot)
3057 prot = reqprot;
3058
3059#ifndef CONFIG_PPC32
Stephen Smalleydb4c9642006-02-01 03:05:54 -08003060 if ((prot & PROT_EXEC) && !(vma->vm_flags & VM_EXEC)) {
James Morrisd541bbe2009-01-29 12:19:51 +11003061 int rc = 0;
Stephen Smalleydb4c9642006-02-01 03:05:54 -08003062 if (vma->vm_start >= vma->vm_mm->start_brk &&
3063 vma->vm_end <= vma->vm_mm->brk) {
David Howellsd84f4f92008-11-14 10:39:23 +11003064 rc = cred_has_perm(cred, cred, PROCESS__EXECHEAP);
Stephen Smalleydb4c9642006-02-01 03:05:54 -08003065 } else if (!vma->vm_file &&
3066 vma->vm_start <= vma->vm_mm->start_stack &&
3067 vma->vm_end >= vma->vm_mm->start_stack) {
David Howells3b11a1d2008-11-14 10:39:26 +11003068 rc = current_has_perm(current, PROCESS__EXECSTACK);
Stephen Smalleydb4c9642006-02-01 03:05:54 -08003069 } else if (vma->vm_file && vma->anon_vma) {
3070 /*
3071 * We are making executable a file mapping that has
3072 * had some COW done. Since pages might have been
3073 * written, check ability to execute the possibly
3074 * modified content. This typically should only
3075 * occur for text relocations.
3076 */
David Howellsd84f4f92008-11-14 10:39:23 +11003077 rc = file_has_perm(cred, vma->vm_file, FILE__EXECMOD);
Stephen Smalleydb4c9642006-02-01 03:05:54 -08003078 }
Lorenzo Hernandez García-Hierro6b992192005-06-25 14:54:34 -07003079 if (rc)
3080 return rc;
3081 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003082#endif
3083
3084 return file_map_prot_check(vma->vm_file, prot, vma->vm_flags&VM_SHARED);
3085}
3086
3087static int selinux_file_lock(struct file *file, unsigned int cmd)
3088{
David Howells88e67f32008-11-14 10:39:21 +11003089 const struct cred *cred = current_cred();
3090
3091 return file_has_perm(cred, file, FILE__LOCK);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003092}
3093
3094static int selinux_file_fcntl(struct file *file, unsigned int cmd,
3095 unsigned long arg)
3096{
David Howells88e67f32008-11-14 10:39:21 +11003097 const struct cred *cred = current_cred();
Linus Torvalds1da177e2005-04-16 15:20:36 -07003098 int err = 0;
3099
3100 switch (cmd) {
Eric Paris828dfe12008-04-17 13:17:49 -04003101 case F_SETFL:
3102 if (!file->f_path.dentry || !file->f_path.dentry->d_inode) {
3103 err = -EINVAL;
3104 break;
3105 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003106
Eric Paris828dfe12008-04-17 13:17:49 -04003107 if ((file->f_flags & O_APPEND) && !(arg & O_APPEND)) {
David Howells88e67f32008-11-14 10:39:21 +11003108 err = file_has_perm(cred, file, FILE__WRITE);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003109 break;
Eric Paris828dfe12008-04-17 13:17:49 -04003110 }
3111 /* fall through */
3112 case F_SETOWN:
3113 case F_SETSIG:
3114 case F_GETFL:
3115 case F_GETOWN:
3116 case F_GETSIG:
3117 /* Just check FD__USE permission */
David Howells88e67f32008-11-14 10:39:21 +11003118 err = file_has_perm(cred, file, 0);
Eric Paris828dfe12008-04-17 13:17:49 -04003119 break;
3120 case F_GETLK:
3121 case F_SETLK:
3122 case F_SETLKW:
Linus Torvalds1da177e2005-04-16 15:20:36 -07003123#if BITS_PER_LONG == 32
Eric Paris828dfe12008-04-17 13:17:49 -04003124 case F_GETLK64:
3125 case F_SETLK64:
3126 case F_SETLKW64:
Linus Torvalds1da177e2005-04-16 15:20:36 -07003127#endif
Eric Paris828dfe12008-04-17 13:17:49 -04003128 if (!file->f_path.dentry || !file->f_path.dentry->d_inode) {
3129 err = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003130 break;
Eric Paris828dfe12008-04-17 13:17:49 -04003131 }
David Howells88e67f32008-11-14 10:39:21 +11003132 err = file_has_perm(cred, file, FILE__LOCK);
Eric Paris828dfe12008-04-17 13:17:49 -04003133 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003134 }
3135
3136 return err;
3137}
3138
3139static int selinux_file_set_fowner(struct file *file)
3140{
Linus Torvalds1da177e2005-04-16 15:20:36 -07003141 struct file_security_struct *fsec;
3142
Linus Torvalds1da177e2005-04-16 15:20:36 -07003143 fsec = file->f_security;
David Howells275bb412008-11-14 10:39:19 +11003144 fsec->fown_sid = current_sid();
Linus Torvalds1da177e2005-04-16 15:20:36 -07003145
3146 return 0;
3147}
3148
3149static int selinux_file_send_sigiotask(struct task_struct *tsk,
3150 struct fown_struct *fown, int signum)
3151{
Eric Paris828dfe12008-04-17 13:17:49 -04003152 struct file *file;
Stephen Smalley65c90bc2009-05-04 15:43:18 -04003153 u32 sid = task_sid(tsk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003154 u32 perm;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003155 struct file_security_struct *fsec;
3156
3157 /* struct fown_struct is never outside the context of a struct file */
Eric Paris828dfe12008-04-17 13:17:49 -04003158 file = container_of(fown, struct file, f_owner);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003159
Linus Torvalds1da177e2005-04-16 15:20:36 -07003160 fsec = file->f_security;
3161
3162 if (!signum)
3163 perm = signal_to_av(SIGIO); /* as per send_sigio_to_task */
3164 else
3165 perm = signal_to_av(signum);
3166
David Howells275bb412008-11-14 10:39:19 +11003167 return avc_has_perm(fsec->fown_sid, sid,
Linus Torvalds1da177e2005-04-16 15:20:36 -07003168 SECCLASS_PROCESS, perm, NULL);
3169}
3170
3171static int selinux_file_receive(struct file *file)
3172{
David Howells88e67f32008-11-14 10:39:21 +11003173 const struct cred *cred = current_cred();
3174
3175 return file_has_perm(cred, file, file_to_av(file));
Linus Torvalds1da177e2005-04-16 15:20:36 -07003176}
3177
David Howells745ca242008-11-14 10:39:22 +11003178static int selinux_dentry_open(struct file *file, const struct cred *cred)
Yuichi Nakamura788e7dd2007-09-14 09:27:07 +09003179{
3180 struct file_security_struct *fsec;
3181 struct inode *inode;
3182 struct inode_security_struct *isec;
David Howellsd84f4f92008-11-14 10:39:23 +11003183
Yuichi Nakamura788e7dd2007-09-14 09:27:07 +09003184 inode = file->f_path.dentry->d_inode;
3185 fsec = file->f_security;
3186 isec = inode->i_security;
3187 /*
3188 * Save inode label and policy sequence number
3189 * at open-time so that selinux_file_permission
3190 * can determine whether revalidation is necessary.
3191 * Task label is already saved in the file security
3192 * struct as its SID.
3193 */
3194 fsec->isid = isec->sid;
3195 fsec->pseqno = avc_policy_seqno();
3196 /*
3197 * Since the inode label or policy seqno may have changed
3198 * between the selinux_inode_permission check and the saving
3199 * of state above, recheck that access is still permitted.
3200 * Otherwise, access might never be revalidated against the
3201 * new inode label or new policy.
3202 * This check is not redundant - do not remove.
3203 */
David Howells88e67f32008-11-14 10:39:21 +11003204 return inode_has_perm(cred, inode, open_file_to_av(file), NULL);
Yuichi Nakamura788e7dd2007-09-14 09:27:07 +09003205}
3206
Linus Torvalds1da177e2005-04-16 15:20:36 -07003207/* task security operations */
3208
3209static int selinux_task_create(unsigned long clone_flags)
3210{
David Howells3b11a1d2008-11-14 10:39:26 +11003211 return current_has_perm(current, PROCESS__FORK);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003212}
3213
David Howellsf1752ee2008-11-14 10:39:17 +11003214/*
3215 * detach and free the LSM part of a set of credentials
3216 */
3217static void selinux_cred_free(struct cred *cred)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003218{
David Howellsf1752ee2008-11-14 10:39:17 +11003219 struct task_security_struct *tsec = cred->security;
3220 cred->security = NULL;
3221 kfree(tsec);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003222}
3223
David Howellsd84f4f92008-11-14 10:39:23 +11003224/*
3225 * prepare a new set of credentials for modification
3226 */
3227static int selinux_cred_prepare(struct cred *new, const struct cred *old,
3228 gfp_t gfp)
3229{
3230 const struct task_security_struct *old_tsec;
3231 struct task_security_struct *tsec;
3232
3233 old_tsec = old->security;
3234
3235 tsec = kmemdup(old_tsec, sizeof(struct task_security_struct), gfp);
3236 if (!tsec)
3237 return -ENOMEM;
3238
3239 new->security = tsec;
3240 return 0;
3241}
3242
3243/*
David Howells3a3b7ce2008-11-14 10:39:28 +11003244 * set the security data for a kernel service
3245 * - all the creation contexts are set to unlabelled
3246 */
3247static int selinux_kernel_act_as(struct cred *new, u32 secid)
3248{
3249 struct task_security_struct *tsec = new->security;
3250 u32 sid = current_sid();
3251 int ret;
3252
3253 ret = avc_has_perm(sid, secid,
3254 SECCLASS_KERNEL_SERVICE,
3255 KERNEL_SERVICE__USE_AS_OVERRIDE,
3256 NULL);
3257 if (ret == 0) {
3258 tsec->sid = secid;
3259 tsec->create_sid = 0;
3260 tsec->keycreate_sid = 0;
3261 tsec->sockcreate_sid = 0;
3262 }
3263 return ret;
3264}
3265
3266/*
3267 * set the file creation context in a security record to the same as the
3268 * objective context of the specified inode
3269 */
3270static int selinux_kernel_create_files_as(struct cred *new, struct inode *inode)
3271{
3272 struct inode_security_struct *isec = inode->i_security;
3273 struct task_security_struct *tsec = new->security;
3274 u32 sid = current_sid();
3275 int ret;
3276
3277 ret = avc_has_perm(sid, isec->sid,
3278 SECCLASS_KERNEL_SERVICE,
3279 KERNEL_SERVICE__CREATE_FILES_AS,
3280 NULL);
3281
3282 if (ret == 0)
3283 tsec->create_sid = isec->sid;
3284 return 0;
3285}
3286
Linus Torvalds1da177e2005-04-16 15:20:36 -07003287static int selinux_task_setpgid(struct task_struct *p, pid_t pgid)
3288{
David Howells3b11a1d2008-11-14 10:39:26 +11003289 return current_has_perm(p, PROCESS__SETPGID);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003290}
3291
3292static int selinux_task_getpgid(struct task_struct *p)
3293{
David Howells3b11a1d2008-11-14 10:39:26 +11003294 return current_has_perm(p, PROCESS__GETPGID);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003295}
3296
3297static int selinux_task_getsid(struct task_struct *p)
3298{
David Howells3b11a1d2008-11-14 10:39:26 +11003299 return current_has_perm(p, PROCESS__GETSESSION);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003300}
3301
David Quigleyf9008e42006-06-30 01:55:46 -07003302static void selinux_task_getsecid(struct task_struct *p, u32 *secid)
3303{
David Howells275bb412008-11-14 10:39:19 +11003304 *secid = task_sid(p);
David Quigleyf9008e42006-06-30 01:55:46 -07003305}
3306
Linus Torvalds1da177e2005-04-16 15:20:36 -07003307static int selinux_task_setnice(struct task_struct *p, int nice)
3308{
3309 int rc;
3310
Eric Paris200ac532009-02-12 15:01:04 -05003311 rc = cap_task_setnice(p, nice);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003312 if (rc)
3313 return rc;
3314
David Howells3b11a1d2008-11-14 10:39:26 +11003315 return current_has_perm(p, PROCESS__SETSCHED);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003316}
3317
James Morris03e68062006-06-23 02:03:58 -07003318static int selinux_task_setioprio(struct task_struct *p, int ioprio)
3319{
Serge E. Hallynb5376772007-10-16 23:31:36 -07003320 int rc;
3321
Eric Paris200ac532009-02-12 15:01:04 -05003322 rc = cap_task_setioprio(p, ioprio);
Serge E. Hallynb5376772007-10-16 23:31:36 -07003323 if (rc)
3324 return rc;
3325
David Howells3b11a1d2008-11-14 10:39:26 +11003326 return current_has_perm(p, PROCESS__SETSCHED);
James Morris03e68062006-06-23 02:03:58 -07003327}
3328
David Quigleya1836a42006-06-30 01:55:49 -07003329static int selinux_task_getioprio(struct task_struct *p)
3330{
David Howells3b11a1d2008-11-14 10:39:26 +11003331 return current_has_perm(p, PROCESS__GETSCHED);
David Quigleya1836a42006-06-30 01:55:49 -07003332}
3333
Linus Torvalds1da177e2005-04-16 15:20:36 -07003334static int selinux_task_setrlimit(unsigned int resource, struct rlimit *new_rlim)
3335{
3336 struct rlimit *old_rlim = current->signal->rlim + resource;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003337
3338 /* Control the ability to change the hard limit (whether
3339 lowering or raising it), so that the hard limit can
3340 later be used as a safe reset point for the soft limit
David Howellsd84f4f92008-11-14 10:39:23 +11003341 upon context transitions. See selinux_bprm_committing_creds. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003342 if (old_rlim->rlim_max != new_rlim->rlim_max)
David Howells3b11a1d2008-11-14 10:39:26 +11003343 return current_has_perm(current, PROCESS__SETRLIMIT);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003344
3345 return 0;
3346}
3347
3348static int selinux_task_setscheduler(struct task_struct *p, int policy, struct sched_param *lp)
3349{
Serge E. Hallynb5376772007-10-16 23:31:36 -07003350 int rc;
3351
Eric Paris200ac532009-02-12 15:01:04 -05003352 rc = cap_task_setscheduler(p, policy, lp);
Serge E. Hallynb5376772007-10-16 23:31:36 -07003353 if (rc)
3354 return rc;
3355
David Howells3b11a1d2008-11-14 10:39:26 +11003356 return current_has_perm(p, PROCESS__SETSCHED);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003357}
3358
3359static int selinux_task_getscheduler(struct task_struct *p)
3360{
David Howells3b11a1d2008-11-14 10:39:26 +11003361 return current_has_perm(p, PROCESS__GETSCHED);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003362}
3363
David Quigley35601542006-06-23 02:04:01 -07003364static int selinux_task_movememory(struct task_struct *p)
3365{
David Howells3b11a1d2008-11-14 10:39:26 +11003366 return current_has_perm(p, PROCESS__SETSCHED);
David Quigley35601542006-06-23 02:04:01 -07003367}
3368
David Quigleyf9008e42006-06-30 01:55:46 -07003369static int selinux_task_kill(struct task_struct *p, struct siginfo *info,
3370 int sig, u32 secid)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003371{
3372 u32 perm;
3373 int rc;
3374
Linus Torvalds1da177e2005-04-16 15:20:36 -07003375 if (!sig)
3376 perm = PROCESS__SIGNULL; /* null signal; existence test */
3377 else
3378 perm = signal_to_av(sig);
David Quigleyf9008e42006-06-30 01:55:46 -07003379 if (secid)
David Howells275bb412008-11-14 10:39:19 +11003380 rc = avc_has_perm(secid, task_sid(p),
3381 SECCLASS_PROCESS, perm, NULL);
David Quigleyf9008e42006-06-30 01:55:46 -07003382 else
David Howells3b11a1d2008-11-14 10:39:26 +11003383 rc = current_has_perm(p, perm);
David Quigleyf9008e42006-06-30 01:55:46 -07003384 return rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003385}
3386
Linus Torvalds1da177e2005-04-16 15:20:36 -07003387static int selinux_task_wait(struct task_struct *p)
3388{
Eric Paris8a535142007-10-22 16:10:31 -04003389 return task_has_perm(p, current, PROCESS__SIGCHLD);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003390}
3391
Linus Torvalds1da177e2005-04-16 15:20:36 -07003392static void selinux_task_to_inode(struct task_struct *p,
3393 struct inode *inode)
3394{
Linus Torvalds1da177e2005-04-16 15:20:36 -07003395 struct inode_security_struct *isec = inode->i_security;
David Howells275bb412008-11-14 10:39:19 +11003396 u32 sid = task_sid(p);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003397
David Howells275bb412008-11-14 10:39:19 +11003398 isec->sid = sid;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003399 isec->initialized = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003400}
3401
Linus Torvalds1da177e2005-04-16 15:20:36 -07003402/* Returns error only if unable to parse addresses */
Venkat Yekkirala67f83cb2006-11-08 17:04:26 -06003403static int selinux_parse_skb_ipv4(struct sk_buff *skb,
3404 struct avc_audit_data *ad, u8 *proto)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003405{
3406 int offset, ihlen, ret = -EINVAL;
3407 struct iphdr _iph, *ih;
3408
Arnaldo Carvalho de Melobbe735e2007-03-10 22:16:10 -03003409 offset = skb_network_offset(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003410 ih = skb_header_pointer(skb, offset, sizeof(_iph), &_iph);
3411 if (ih == NULL)
3412 goto out;
3413
3414 ihlen = ih->ihl * 4;
3415 if (ihlen < sizeof(_iph))
3416 goto out;
3417
3418 ad->u.net.v4info.saddr = ih->saddr;
3419 ad->u.net.v4info.daddr = ih->daddr;
3420 ret = 0;
3421
Venkat Yekkirala67f83cb2006-11-08 17:04:26 -06003422 if (proto)
3423 *proto = ih->protocol;
3424
Linus Torvalds1da177e2005-04-16 15:20:36 -07003425 switch (ih->protocol) {
Eric Paris828dfe12008-04-17 13:17:49 -04003426 case IPPROTO_TCP: {
3427 struct tcphdr _tcph, *th;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003428
Eric Paris828dfe12008-04-17 13:17:49 -04003429 if (ntohs(ih->frag_off) & IP_OFFSET)
3430 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003431
3432 offset += ihlen;
3433 th = skb_header_pointer(skb, offset, sizeof(_tcph), &_tcph);
3434 if (th == NULL)
3435 break;
3436
3437 ad->u.net.sport = th->source;
3438 ad->u.net.dport = th->dest;
3439 break;
Eric Paris828dfe12008-04-17 13:17:49 -04003440 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003441
Eric Paris828dfe12008-04-17 13:17:49 -04003442 case IPPROTO_UDP: {
3443 struct udphdr _udph, *uh;
3444
3445 if (ntohs(ih->frag_off) & IP_OFFSET)
3446 break;
3447
3448 offset += ihlen;
3449 uh = skb_header_pointer(skb, offset, sizeof(_udph), &_udph);
3450 if (uh == NULL)
3451 break;
3452
3453 ad->u.net.sport = uh->source;
3454 ad->u.net.dport = uh->dest;
3455 break;
3456 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003457
James Morris2ee92d42006-11-13 16:09:01 -08003458 case IPPROTO_DCCP: {
3459 struct dccp_hdr _dccph, *dh;
3460
3461 if (ntohs(ih->frag_off) & IP_OFFSET)
3462 break;
3463
3464 offset += ihlen;
3465 dh = skb_header_pointer(skb, offset, sizeof(_dccph), &_dccph);
3466 if (dh == NULL)
3467 break;
3468
3469 ad->u.net.sport = dh->dccph_sport;
3470 ad->u.net.dport = dh->dccph_dport;
3471 break;
Eric Paris828dfe12008-04-17 13:17:49 -04003472 }
James Morris2ee92d42006-11-13 16:09:01 -08003473
Eric Paris828dfe12008-04-17 13:17:49 -04003474 default:
3475 break;
3476 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003477out:
3478 return ret;
3479}
3480
3481#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
3482
3483/* Returns error only if unable to parse addresses */
Venkat Yekkirala67f83cb2006-11-08 17:04:26 -06003484static int selinux_parse_skb_ipv6(struct sk_buff *skb,
3485 struct avc_audit_data *ad, u8 *proto)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003486{
3487 u8 nexthdr;
3488 int ret = -EINVAL, offset;
3489 struct ipv6hdr _ipv6h, *ip6;
3490
Arnaldo Carvalho de Melobbe735e2007-03-10 22:16:10 -03003491 offset = skb_network_offset(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003492 ip6 = skb_header_pointer(skb, offset, sizeof(_ipv6h), &_ipv6h);
3493 if (ip6 == NULL)
3494 goto out;
3495
3496 ipv6_addr_copy(&ad->u.net.v6info.saddr, &ip6->saddr);
3497 ipv6_addr_copy(&ad->u.net.v6info.daddr, &ip6->daddr);
3498 ret = 0;
3499
3500 nexthdr = ip6->nexthdr;
3501 offset += sizeof(_ipv6h);
Herbert Xu0d3d0772005-04-24 20:16:19 -07003502 offset = ipv6_skip_exthdr(skb, offset, &nexthdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003503 if (offset < 0)
3504 goto out;
3505
Venkat Yekkirala67f83cb2006-11-08 17:04:26 -06003506 if (proto)
3507 *proto = nexthdr;
3508
Linus Torvalds1da177e2005-04-16 15:20:36 -07003509 switch (nexthdr) {
3510 case IPPROTO_TCP: {
Eric Paris828dfe12008-04-17 13:17:49 -04003511 struct tcphdr _tcph, *th;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003512
3513 th = skb_header_pointer(skb, offset, sizeof(_tcph), &_tcph);
3514 if (th == NULL)
3515 break;
3516
3517 ad->u.net.sport = th->source;
3518 ad->u.net.dport = th->dest;
3519 break;
3520 }
3521
3522 case IPPROTO_UDP: {
3523 struct udphdr _udph, *uh;
3524
3525 uh = skb_header_pointer(skb, offset, sizeof(_udph), &_udph);
3526 if (uh == NULL)
3527 break;
3528
3529 ad->u.net.sport = uh->source;
3530 ad->u.net.dport = uh->dest;
3531 break;
3532 }
3533
James Morris2ee92d42006-11-13 16:09:01 -08003534 case IPPROTO_DCCP: {
3535 struct dccp_hdr _dccph, *dh;
3536
3537 dh = skb_header_pointer(skb, offset, sizeof(_dccph), &_dccph);
3538 if (dh == NULL)
3539 break;
3540
3541 ad->u.net.sport = dh->dccph_sport;
3542 ad->u.net.dport = dh->dccph_dport;
3543 break;
Eric Paris828dfe12008-04-17 13:17:49 -04003544 }
James Morris2ee92d42006-11-13 16:09:01 -08003545
Linus Torvalds1da177e2005-04-16 15:20:36 -07003546 /* includes fragments */
3547 default:
3548 break;
3549 }
3550out:
3551 return ret;
3552}
3553
3554#endif /* IPV6 */
3555
3556static int selinux_parse_skb(struct sk_buff *skb, struct avc_audit_data *ad,
David Howellscf9481e2008-07-27 21:31:07 +10003557 char **_addrp, int src, u8 *proto)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003558{
David Howellscf9481e2008-07-27 21:31:07 +10003559 char *addrp;
3560 int ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003561
3562 switch (ad->u.net.family) {
3563 case PF_INET:
Venkat Yekkirala67f83cb2006-11-08 17:04:26 -06003564 ret = selinux_parse_skb_ipv4(skb, ad, proto);
David Howellscf9481e2008-07-27 21:31:07 +10003565 if (ret)
3566 goto parse_error;
3567 addrp = (char *)(src ? &ad->u.net.v4info.saddr :
3568 &ad->u.net.v4info.daddr);
3569 goto okay;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003570
3571#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
3572 case PF_INET6:
Venkat Yekkirala67f83cb2006-11-08 17:04:26 -06003573 ret = selinux_parse_skb_ipv6(skb, ad, proto);
David Howellscf9481e2008-07-27 21:31:07 +10003574 if (ret)
3575 goto parse_error;
3576 addrp = (char *)(src ? &ad->u.net.v6info.saddr :
3577 &ad->u.net.v6info.daddr);
3578 goto okay;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003579#endif /* IPV6 */
3580 default:
David Howellscf9481e2008-07-27 21:31:07 +10003581 addrp = NULL;
3582 goto okay;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003583 }
3584
David Howellscf9481e2008-07-27 21:31:07 +10003585parse_error:
3586 printk(KERN_WARNING
3587 "SELinux: failure in selinux_parse_skb(),"
3588 " unable to parse packet\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07003589 return ret;
David Howellscf9481e2008-07-27 21:31:07 +10003590
3591okay:
3592 if (_addrp)
3593 *_addrp = addrp;
3594 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003595}
3596
Paul Moore4f6a9932007-03-01 14:35:22 -05003597/**
Paul Moore220deb92008-01-29 08:38:23 -05003598 * selinux_skb_peerlbl_sid - Determine the peer label of a packet
Paul Moore4f6a9932007-03-01 14:35:22 -05003599 * @skb: the packet
Paul Moore75e22912008-01-29 08:38:04 -05003600 * @family: protocol family
Paul Moore220deb92008-01-29 08:38:23 -05003601 * @sid: the packet's peer label SID
Paul Moore4f6a9932007-03-01 14:35:22 -05003602 *
3603 * Description:
Paul Moore220deb92008-01-29 08:38:23 -05003604 * Check the various different forms of network peer labeling and determine
3605 * the peer label/SID for the packet; most of the magic actually occurs in
3606 * the security server function security_net_peersid_cmp(). The function
3607 * returns zero if the value in @sid is valid (although it may be SECSID_NULL)
3608 * or -EACCES if @sid is invalid due to inconsistencies with the different
3609 * peer labels.
Paul Moore4f6a9932007-03-01 14:35:22 -05003610 *
3611 */
Paul Moore220deb92008-01-29 08:38:23 -05003612static int selinux_skb_peerlbl_sid(struct sk_buff *skb, u16 family, u32 *sid)
Paul Moore4f6a9932007-03-01 14:35:22 -05003613{
Paul Moore71f1cb02008-01-29 08:51:16 -05003614 int err;
Paul Moore4f6a9932007-03-01 14:35:22 -05003615 u32 xfrm_sid;
3616 u32 nlbl_sid;
Paul Moore220deb92008-01-29 08:38:23 -05003617 u32 nlbl_type;
Paul Moore4f6a9932007-03-01 14:35:22 -05003618
3619 selinux_skb_xfrm_sid(skb, &xfrm_sid);
Paul Moore5dbe1eb2008-01-29 08:44:18 -05003620 selinux_netlbl_skbuff_getsid(skb, family, &nlbl_type, &nlbl_sid);
Paul Moore220deb92008-01-29 08:38:23 -05003621
Paul Moore71f1cb02008-01-29 08:51:16 -05003622 err = security_net_peersid_resolve(nlbl_sid, nlbl_type, xfrm_sid, sid);
3623 if (unlikely(err)) {
3624 printk(KERN_WARNING
3625 "SELinux: failure in selinux_skb_peerlbl_sid(),"
3626 " unable to determine packet's peer label\n");
Paul Moore220deb92008-01-29 08:38:23 -05003627 return -EACCES;
Paul Moore71f1cb02008-01-29 08:51:16 -05003628 }
Paul Moore220deb92008-01-29 08:38:23 -05003629
3630 return 0;
Paul Moore4f6a9932007-03-01 14:35:22 -05003631}
3632
Linus Torvalds1da177e2005-04-16 15:20:36 -07003633/* socket security operations */
3634static int socket_has_perm(struct task_struct *task, struct socket *sock,
3635 u32 perms)
3636{
3637 struct inode_security_struct *isec;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003638 struct avc_audit_data ad;
David Howells275bb412008-11-14 10:39:19 +11003639 u32 sid;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003640 int err = 0;
3641
Linus Torvalds1da177e2005-04-16 15:20:36 -07003642 isec = SOCK_INODE(sock)->i_security;
3643
3644 if (isec->sid == SECINITSID_KERNEL)
3645 goto out;
David Howells275bb412008-11-14 10:39:19 +11003646 sid = task_sid(task);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003647
Eric Paris828dfe12008-04-17 13:17:49 -04003648 AVC_AUDIT_DATA_INIT(&ad, NET);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003649 ad.u.net.sk = sock->sk;
David Howells275bb412008-11-14 10:39:19 +11003650 err = avc_has_perm(sid, isec->sid, isec->sclass, perms, &ad);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003651
3652out:
3653 return err;
3654}
3655
3656static int selinux_socket_create(int family, int type,
3657 int protocol, int kern)
3658{
David Howells275bb412008-11-14 10:39:19 +11003659 const struct cred *cred = current_cred();
3660 const struct task_security_struct *tsec = cred->security;
3661 u32 sid, newsid;
3662 u16 secclass;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003663 int err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003664
3665 if (kern)
3666 goto out;
3667
David Howells275bb412008-11-14 10:39:19 +11003668 sid = tsec->sid;
3669 newsid = tsec->sockcreate_sid ?: sid;
3670
3671 secclass = socket_type_to_security_class(family, type, protocol);
3672 err = avc_has_perm(sid, newsid, secclass, SOCKET__CREATE, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003673
3674out:
3675 return err;
3676}
3677
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07003678static int selinux_socket_post_create(struct socket *sock, int family,
3679 int type, int protocol, int kern)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003680{
David Howells275bb412008-11-14 10:39:19 +11003681 const struct cred *cred = current_cred();
3682 const struct task_security_struct *tsec = cred->security;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003683 struct inode_security_struct *isec;
Venkat Yekkirala892c1412006-08-04 23:08:56 -07003684 struct sk_security_struct *sksec;
David Howells275bb412008-11-14 10:39:19 +11003685 u32 sid, newsid;
3686 int err = 0;
3687
3688 sid = tsec->sid;
3689 newsid = tsec->sockcreate_sid;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003690
3691 isec = SOCK_INODE(sock)->i_security;
3692
David Howells275bb412008-11-14 10:39:19 +11003693 if (kern)
3694 isec->sid = SECINITSID_KERNEL;
3695 else if (newsid)
3696 isec->sid = newsid;
3697 else
3698 isec->sid = sid;
3699
Linus Torvalds1da177e2005-04-16 15:20:36 -07003700 isec->sclass = socket_type_to_security_class(family, type, protocol);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003701 isec->initialized = 1;
3702
Venkat Yekkirala892c1412006-08-04 23:08:56 -07003703 if (sock->sk) {
3704 sksec = sock->sk->sk_security;
3705 sksec->sid = isec->sid;
Paul Moore220deb92008-01-29 08:38:23 -05003706 sksec->sclass = isec->sclass;
Paul Moore389fb8002009-03-27 17:10:34 -04003707 err = selinux_netlbl_socket_post_create(sock->sk, family);
Venkat Yekkirala892c1412006-08-04 23:08:56 -07003708 }
3709
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07003710 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003711}
3712
3713/* Range of port numbers used to automatically bind.
3714 Need to determine whether we should perform a name_bind
3715 permission check between the socket and the port number. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003716
3717static int selinux_socket_bind(struct socket *sock, struct sockaddr *address, int addrlen)
3718{
3719 u16 family;
3720 int err;
3721
3722 err = socket_has_perm(current, sock, SOCKET__BIND);
3723 if (err)
3724 goto out;
3725
3726 /*
3727 * If PF_INET or PF_INET6, check name_bind permission for the port.
James Morris13402582005-09-30 14:24:34 -04003728 * Multiple address binding for SCTP is not supported yet: we just
3729 * check the first address now.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003730 */
3731 family = sock->sk->sk_family;
3732 if (family == PF_INET || family == PF_INET6) {
3733 char *addrp;
3734 struct inode_security_struct *isec;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003735 struct avc_audit_data ad;
3736 struct sockaddr_in *addr4 = NULL;
3737 struct sockaddr_in6 *addr6 = NULL;
3738 unsigned short snum;
3739 struct sock *sk = sock->sk;
James Morrise399f982008-06-12 01:39:58 +10003740 u32 sid, node_perm;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003741
Linus Torvalds1da177e2005-04-16 15:20:36 -07003742 isec = SOCK_INODE(sock)->i_security;
3743
3744 if (family == PF_INET) {
3745 addr4 = (struct sockaddr_in *)address;
3746 snum = ntohs(addr4->sin_port);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003747 addrp = (char *)&addr4->sin_addr.s_addr;
3748 } else {
3749 addr6 = (struct sockaddr_in6 *)address;
3750 snum = ntohs(addr6->sin6_port);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003751 addrp = (char *)&addr6->sin6_addr.s6_addr;
3752 }
3753
Stephen Hemminger227b60f2007-10-10 17:30:46 -07003754 if (snum) {
3755 int low, high;
3756
3757 inet_get_local_port_range(&low, &high);
3758
3759 if (snum < max(PROT_SOCK, low) || snum > high) {
Paul Moore3e112172008-04-10 10:48:14 -04003760 err = sel_netport_sid(sk->sk_protocol,
3761 snum, &sid);
Stephen Hemminger227b60f2007-10-10 17:30:46 -07003762 if (err)
3763 goto out;
Eric Paris828dfe12008-04-17 13:17:49 -04003764 AVC_AUDIT_DATA_INIT(&ad, NET);
Stephen Hemminger227b60f2007-10-10 17:30:46 -07003765 ad.u.net.sport = htons(snum);
3766 ad.u.net.family = family;
3767 err = avc_has_perm(isec->sid, sid,
3768 isec->sclass,
3769 SOCKET__NAME_BIND, &ad);
3770 if (err)
3771 goto out;
3772 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003773 }
Eric Paris828dfe12008-04-17 13:17:49 -04003774
3775 switch (isec->sclass) {
James Morris13402582005-09-30 14:24:34 -04003776 case SECCLASS_TCP_SOCKET:
Linus Torvalds1da177e2005-04-16 15:20:36 -07003777 node_perm = TCP_SOCKET__NODE_BIND;
3778 break;
Eric Paris828dfe12008-04-17 13:17:49 -04003779
James Morris13402582005-09-30 14:24:34 -04003780 case SECCLASS_UDP_SOCKET:
Linus Torvalds1da177e2005-04-16 15:20:36 -07003781 node_perm = UDP_SOCKET__NODE_BIND;
3782 break;
James Morris2ee92d42006-11-13 16:09:01 -08003783
3784 case SECCLASS_DCCP_SOCKET:
3785 node_perm = DCCP_SOCKET__NODE_BIND;
3786 break;
3787
Linus Torvalds1da177e2005-04-16 15:20:36 -07003788 default:
3789 node_perm = RAWIP_SOCKET__NODE_BIND;
3790 break;
3791 }
Eric Paris828dfe12008-04-17 13:17:49 -04003792
Paul Moore224dfbd2008-01-29 08:38:13 -05003793 err = sel_netnode_sid(addrp, family, &sid);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003794 if (err)
3795 goto out;
Eric Paris828dfe12008-04-17 13:17:49 -04003796
3797 AVC_AUDIT_DATA_INIT(&ad, NET);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003798 ad.u.net.sport = htons(snum);
3799 ad.u.net.family = family;
3800
3801 if (family == PF_INET)
3802 ad.u.net.v4info.saddr = addr4->sin_addr.s_addr;
3803 else
3804 ipv6_addr_copy(&ad.u.net.v6info.saddr, &addr6->sin6_addr);
3805
3806 err = avc_has_perm(isec->sid, sid,
Eric Paris828dfe12008-04-17 13:17:49 -04003807 isec->sclass, node_perm, &ad);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003808 if (err)
3809 goto out;
3810 }
3811out:
3812 return err;
3813}
3814
3815static int selinux_socket_connect(struct socket *sock, struct sockaddr *address, int addrlen)
3816{
Paul Moore014ab192008-10-10 10:16:33 -04003817 struct sock *sk = sock->sk;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003818 struct inode_security_struct *isec;
3819 int err;
3820
3821 err = socket_has_perm(current, sock, SOCKET__CONNECT);
3822 if (err)
3823 return err;
3824
3825 /*
James Morris2ee92d42006-11-13 16:09:01 -08003826 * If a TCP or DCCP socket, check name_connect permission for the port.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003827 */
3828 isec = SOCK_INODE(sock)->i_security;
James Morris2ee92d42006-11-13 16:09:01 -08003829 if (isec->sclass == SECCLASS_TCP_SOCKET ||
3830 isec->sclass == SECCLASS_DCCP_SOCKET) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003831 struct avc_audit_data ad;
3832 struct sockaddr_in *addr4 = NULL;
3833 struct sockaddr_in6 *addr6 = NULL;
3834 unsigned short snum;
James Morris2ee92d42006-11-13 16:09:01 -08003835 u32 sid, perm;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003836
3837 if (sk->sk_family == PF_INET) {
3838 addr4 = (struct sockaddr_in *)address;
Stephen Smalley911656f2005-07-28 21:16:21 -07003839 if (addrlen < sizeof(struct sockaddr_in))
Linus Torvalds1da177e2005-04-16 15:20:36 -07003840 return -EINVAL;
3841 snum = ntohs(addr4->sin_port);
3842 } else {
3843 addr6 = (struct sockaddr_in6 *)address;
Stephen Smalley911656f2005-07-28 21:16:21 -07003844 if (addrlen < SIN6_LEN_RFC2133)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003845 return -EINVAL;
3846 snum = ntohs(addr6->sin6_port);
3847 }
3848
Paul Moore3e112172008-04-10 10:48:14 -04003849 err = sel_netport_sid(sk->sk_protocol, snum, &sid);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003850 if (err)
3851 goto out;
3852
James Morris2ee92d42006-11-13 16:09:01 -08003853 perm = (isec->sclass == SECCLASS_TCP_SOCKET) ?
3854 TCP_SOCKET__NAME_CONNECT : DCCP_SOCKET__NAME_CONNECT;
3855
Eric Paris828dfe12008-04-17 13:17:49 -04003856 AVC_AUDIT_DATA_INIT(&ad, NET);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003857 ad.u.net.dport = htons(snum);
3858 ad.u.net.family = sk->sk_family;
James Morris2ee92d42006-11-13 16:09:01 -08003859 err = avc_has_perm(isec->sid, sid, isec->sclass, perm, &ad);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003860 if (err)
3861 goto out;
3862 }
3863
Paul Moore014ab192008-10-10 10:16:33 -04003864 err = selinux_netlbl_socket_connect(sk, address);
3865
Linus Torvalds1da177e2005-04-16 15:20:36 -07003866out:
3867 return err;
3868}
3869
3870static int selinux_socket_listen(struct socket *sock, int backlog)
3871{
3872 return socket_has_perm(current, sock, SOCKET__LISTEN);
3873}
3874
3875static int selinux_socket_accept(struct socket *sock, struct socket *newsock)
3876{
3877 int err;
3878 struct inode_security_struct *isec;
3879 struct inode_security_struct *newisec;
3880
3881 err = socket_has_perm(current, sock, SOCKET__ACCEPT);
3882 if (err)
3883 return err;
3884
3885 newisec = SOCK_INODE(newsock)->i_security;
3886
3887 isec = SOCK_INODE(sock)->i_security;
3888 newisec->sclass = isec->sclass;
3889 newisec->sid = isec->sid;
3890 newisec->initialized = 1;
3891
3892 return 0;
3893}
3894
3895static int selinux_socket_sendmsg(struct socket *sock, struct msghdr *msg,
Eric Paris828dfe12008-04-17 13:17:49 -04003896 int size)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003897{
Paul Moore389fb8002009-03-27 17:10:34 -04003898 return socket_has_perm(current, sock, SOCKET__WRITE);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003899}
3900
3901static int selinux_socket_recvmsg(struct socket *sock, struct msghdr *msg,
3902 int size, int flags)
3903{
3904 return socket_has_perm(current, sock, SOCKET__READ);
3905}
3906
3907static int selinux_socket_getsockname(struct socket *sock)
3908{
3909 return socket_has_perm(current, sock, SOCKET__GETATTR);
3910}
3911
3912static int selinux_socket_getpeername(struct socket *sock)
3913{
3914 return socket_has_perm(current, sock, SOCKET__GETATTR);
3915}
3916
Eric Paris828dfe12008-04-17 13:17:49 -04003917static int selinux_socket_setsockopt(struct socket *sock, int level, int optname)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003918{
Paul Mooref8687af2006-10-30 15:22:15 -08003919 int err;
3920
3921 err = socket_has_perm(current, sock, SOCKET__SETOPT);
3922 if (err)
3923 return err;
3924
3925 return selinux_netlbl_socket_setsockopt(sock, level, optname);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003926}
3927
3928static int selinux_socket_getsockopt(struct socket *sock, int level,
3929 int optname)
3930{
3931 return socket_has_perm(current, sock, SOCKET__GETOPT);
3932}
3933
3934static int selinux_socket_shutdown(struct socket *sock, int how)
3935{
3936 return socket_has_perm(current, sock, SOCKET__SHUTDOWN);
3937}
3938
3939static int selinux_socket_unix_stream_connect(struct socket *sock,
3940 struct socket *other,
3941 struct sock *newsk)
3942{
3943 struct sk_security_struct *ssec;
3944 struct inode_security_struct *isec;
3945 struct inode_security_struct *other_isec;
3946 struct avc_audit_data ad;
3947 int err;
3948
Linus Torvalds1da177e2005-04-16 15:20:36 -07003949 isec = SOCK_INODE(sock)->i_security;
3950 other_isec = SOCK_INODE(other)->i_security;
3951
Eric Paris828dfe12008-04-17 13:17:49 -04003952 AVC_AUDIT_DATA_INIT(&ad, NET);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003953 ad.u.net.sk = other->sk;
3954
3955 err = avc_has_perm(isec->sid, other_isec->sid,
3956 isec->sclass,
3957 UNIX_STREAM_SOCKET__CONNECTTO, &ad);
3958 if (err)
3959 return err;
3960
3961 /* connecting socket */
3962 ssec = sock->sk->sk_security;
3963 ssec->peer_sid = other_isec->sid;
Eric Paris828dfe12008-04-17 13:17:49 -04003964
Linus Torvalds1da177e2005-04-16 15:20:36 -07003965 /* server child socket */
3966 ssec = newsk->sk_security;
3967 ssec->peer_sid = isec->sid;
Venkat Yekkirala4237c752006-07-24 23:32:50 -07003968 err = security_sid_mls_copy(other_isec->sid, ssec->peer_sid, &ssec->sid);
3969
3970 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003971}
3972
3973static int selinux_socket_unix_may_send(struct socket *sock,
3974 struct socket *other)
3975{
3976 struct inode_security_struct *isec;
3977 struct inode_security_struct *other_isec;
3978 struct avc_audit_data ad;
3979 int err;
3980
3981 isec = SOCK_INODE(sock)->i_security;
3982 other_isec = SOCK_INODE(other)->i_security;
3983
Eric Paris828dfe12008-04-17 13:17:49 -04003984 AVC_AUDIT_DATA_INIT(&ad, NET);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003985 ad.u.net.sk = other->sk;
3986
3987 err = avc_has_perm(isec->sid, other_isec->sid,
3988 isec->sclass, SOCKET__SENDTO, &ad);
3989 if (err)
3990 return err;
3991
3992 return 0;
3993}
3994
Paul Mooreeffad8d2008-01-29 08:49:27 -05003995static int selinux_inet_sys_rcv_skb(int ifindex, char *addrp, u16 family,
3996 u32 peer_sid,
3997 struct avc_audit_data *ad)
3998{
3999 int err;
4000 u32 if_sid;
4001 u32 node_sid;
4002
4003 err = sel_netif_sid(ifindex, &if_sid);
4004 if (err)
4005 return err;
4006 err = avc_has_perm(peer_sid, if_sid,
4007 SECCLASS_NETIF, NETIF__INGRESS, ad);
4008 if (err)
4009 return err;
4010
4011 err = sel_netnode_sid(addrp, family, &node_sid);
4012 if (err)
4013 return err;
4014 return avc_has_perm(peer_sid, node_sid,
4015 SECCLASS_NODE, NODE__RECVFROM, ad);
4016}
4017
Paul Moore220deb92008-01-29 08:38:23 -05004018static int selinux_sock_rcv_skb_compat(struct sock *sk, struct sk_buff *skb,
Paul Moored8395c82008-10-10 10:16:30 -04004019 u16 family)
Paul Moore220deb92008-01-29 08:38:23 -05004020{
Paul Moore277d3422008-12-31 12:54:11 -05004021 int err = 0;
Paul Moore220deb92008-01-29 08:38:23 -05004022 struct sk_security_struct *sksec = sk->sk_security;
4023 u32 peer_sid;
4024 u32 sk_sid = sksec->sid;
Paul Moored8395c82008-10-10 10:16:30 -04004025 struct avc_audit_data ad;
4026 char *addrp;
4027
4028 AVC_AUDIT_DATA_INIT(&ad, NET);
4029 ad.u.net.netif = skb->iif;
4030 ad.u.net.family = family;
4031 err = selinux_parse_skb(skb, &ad, &addrp, 1, NULL);
4032 if (err)
4033 return err;
Paul Moore220deb92008-01-29 08:38:23 -05004034
Paul Moore58bfbb52009-03-27 17:10:41 -04004035 if (selinux_secmark_enabled()) {
Paul Moore220deb92008-01-29 08:38:23 -05004036 err = avc_has_perm(sk_sid, skb->secmark, SECCLASS_PACKET,
Paul Moored8395c82008-10-10 10:16:30 -04004037 PACKET__RECV, &ad);
Paul Moore58bfbb52009-03-27 17:10:41 -04004038 if (err)
4039 return err;
4040 }
Paul Moore220deb92008-01-29 08:38:23 -05004041
4042 if (selinux_policycap_netpeer) {
4043 err = selinux_skb_peerlbl_sid(skb, family, &peer_sid);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004044 if (err)
Paul Moore220deb92008-01-29 08:38:23 -05004045 return err;
4046 err = avc_has_perm(sk_sid, peer_sid,
Paul Moored8395c82008-10-10 10:16:30 -04004047 SECCLASS_PEER, PEER__RECV, &ad);
Paul Mooredfaebe92008-10-10 10:16:31 -04004048 if (err)
4049 selinux_netlbl_err(skb, err, 0);
Paul Moore220deb92008-01-29 08:38:23 -05004050 } else {
Paul Moored8395c82008-10-10 10:16:30 -04004051 err = selinux_netlbl_sock_rcv_skb(sksec, skb, family, &ad);
Paul Moore220deb92008-01-29 08:38:23 -05004052 if (err)
4053 return err;
Paul Moored8395c82008-10-10 10:16:30 -04004054 err = selinux_xfrm_sock_rcv_skb(sksec->sid, skb, &ad);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004055 }
Trent Jaegerd28d1e02005-12-13 23:12:40 -08004056
James Morris4e5ab4c2006-06-09 00:33:33 -07004057 return err;
4058}
Trent Jaegerd28d1e02005-12-13 23:12:40 -08004059
James Morris4e5ab4c2006-06-09 00:33:33 -07004060static int selinux_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
4061{
Paul Moore220deb92008-01-29 08:38:23 -05004062 int err;
Venkat Yekkirala4237c752006-07-24 23:32:50 -07004063 struct sk_security_struct *sksec = sk->sk_security;
Paul Moore220deb92008-01-29 08:38:23 -05004064 u16 family = sk->sk_family;
4065 u32 sk_sid = sksec->sid;
Paul Moore220deb92008-01-29 08:38:23 -05004066 struct avc_audit_data ad;
4067 char *addrp;
Paul Moored8395c82008-10-10 10:16:30 -04004068 u8 secmark_active;
4069 u8 peerlbl_active;
James Morris4e5ab4c2006-06-09 00:33:33 -07004070
James Morris4e5ab4c2006-06-09 00:33:33 -07004071 if (family != PF_INET && family != PF_INET6)
Paul Moore220deb92008-01-29 08:38:23 -05004072 return 0;
James Morris4e5ab4c2006-06-09 00:33:33 -07004073
4074 /* Handle mapped IPv4 packets arriving via IPv6 sockets */
Al Viro87fcd702006-12-04 22:00:55 +00004075 if (family == PF_INET6 && skb->protocol == htons(ETH_P_IP))
James Morris4e5ab4c2006-06-09 00:33:33 -07004076 family = PF_INET;
4077
Paul Moored8395c82008-10-10 10:16:30 -04004078 /* If any sort of compatibility mode is enabled then handoff processing
4079 * to the selinux_sock_rcv_skb_compat() function to deal with the
4080 * special handling. We do this in an attempt to keep this function
4081 * as fast and as clean as possible. */
Paul Moore58bfbb52009-03-27 17:10:41 -04004082 if (!selinux_policycap_netpeer)
Paul Moored8395c82008-10-10 10:16:30 -04004083 return selinux_sock_rcv_skb_compat(sk, skb, family);
4084
4085 secmark_active = selinux_secmark_enabled();
4086 peerlbl_active = netlbl_enabled() || selinux_xfrm_enabled();
4087 if (!secmark_active && !peerlbl_active)
4088 return 0;
4089
James Morris4e5ab4c2006-06-09 00:33:33 -07004090 AVC_AUDIT_DATA_INIT(&ad, NET);
Paul Mooreda5645a2008-01-29 08:38:10 -05004091 ad.u.net.netif = skb->iif;
James Morris4e5ab4c2006-06-09 00:33:33 -07004092 ad.u.net.family = family;
Paul Moore224dfbd2008-01-29 08:38:13 -05004093 err = selinux_parse_skb(skb, &ad, &addrp, 1, NULL);
James Morris4e5ab4c2006-06-09 00:33:33 -07004094 if (err)
Paul Moore220deb92008-01-29 08:38:23 -05004095 return err;
James Morris4e5ab4c2006-06-09 00:33:33 -07004096
Paul Moored8395c82008-10-10 10:16:30 -04004097 if (peerlbl_active) {
Paul Moored621d352008-01-29 08:43:36 -05004098 u32 peer_sid;
4099
4100 err = selinux_skb_peerlbl_sid(skb, family, &peer_sid);
4101 if (err)
4102 return err;
Paul Mooreeffad8d2008-01-29 08:49:27 -05004103 err = selinux_inet_sys_rcv_skb(skb->iif, addrp, family,
4104 peer_sid, &ad);
Paul Mooredfaebe92008-10-10 10:16:31 -04004105 if (err) {
4106 selinux_netlbl_err(skb, err, 0);
Paul Mooreeffad8d2008-01-29 08:49:27 -05004107 return err;
Paul Mooredfaebe92008-10-10 10:16:31 -04004108 }
Paul Moored621d352008-01-29 08:43:36 -05004109 err = avc_has_perm(sk_sid, peer_sid, SECCLASS_PEER,
4110 PEER__RECV, &ad);
Paul Mooredfaebe92008-10-10 10:16:31 -04004111 if (err)
4112 selinux_netlbl_err(skb, err, 0);
Paul Moored621d352008-01-29 08:43:36 -05004113 }
4114
Paul Moored8395c82008-10-10 10:16:30 -04004115 if (secmark_active) {
Paul Mooreeffad8d2008-01-29 08:49:27 -05004116 err = avc_has_perm(sk_sid, skb->secmark, SECCLASS_PACKET,
4117 PACKET__RECV, &ad);
4118 if (err)
4119 return err;
4120 }
4121
Paul Moored621d352008-01-29 08:43:36 -05004122 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004123}
4124
Catherine Zhang2c7946a2006-03-20 22:41:23 -08004125static int selinux_socket_getpeersec_stream(struct socket *sock, char __user *optval,
4126 int __user *optlen, unsigned len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004127{
4128 int err = 0;
4129 char *scontext;
4130 u32 scontext_len;
4131 struct sk_security_struct *ssec;
4132 struct inode_security_struct *isec;
Paul Moore3de4bab2006-11-17 17:38:54 -05004133 u32 peer_sid = SECSID_NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004134
4135 isec = SOCK_INODE(sock)->i_security;
Catherine Zhang2c7946a2006-03-20 22:41:23 -08004136
Paul Moore3de4bab2006-11-17 17:38:54 -05004137 if (isec->sclass == SECCLASS_UNIX_STREAM_SOCKET ||
4138 isec->sclass == SECCLASS_TCP_SOCKET) {
Catherine Zhang2c7946a2006-03-20 22:41:23 -08004139 ssec = sock->sk->sk_security;
4140 peer_sid = ssec->peer_sid;
4141 }
Paul Moore3de4bab2006-11-17 17:38:54 -05004142 if (peer_sid == SECSID_NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07004143 err = -ENOPROTOOPT;
4144 goto out;
4145 }
4146
Catherine Zhang2c7946a2006-03-20 22:41:23 -08004147 err = security_sid_to_context(peer_sid, &scontext, &scontext_len);
4148
Linus Torvalds1da177e2005-04-16 15:20:36 -07004149 if (err)
4150 goto out;
4151
4152 if (scontext_len > len) {
4153 err = -ERANGE;
4154 goto out_len;
4155 }
4156
4157 if (copy_to_user(optval, scontext, scontext_len))
4158 err = -EFAULT;
4159
4160out_len:
4161 if (put_user(scontext_len, optlen))
4162 err = -EFAULT;
4163
4164 kfree(scontext);
Eric Paris828dfe12008-04-17 13:17:49 -04004165out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07004166 return err;
4167}
4168
Catherine Zhangdc49c1f2006-08-02 14:12:06 -07004169static int selinux_socket_getpeersec_dgram(struct socket *sock, struct sk_buff *skb, u32 *secid)
Catherine Zhang2c7946a2006-03-20 22:41:23 -08004170{
Catherine Zhangdc49c1f2006-08-02 14:12:06 -07004171 u32 peer_secid = SECSID_NULL;
Paul Moore75e22912008-01-29 08:38:04 -05004172 u16 family;
Catherine Zhang877ce7c2006-06-29 12:27:47 -07004173
Paul Mooreaa862902008-10-10 10:16:29 -04004174 if (skb && skb->protocol == htons(ETH_P_IP))
4175 family = PF_INET;
4176 else if (skb && skb->protocol == htons(ETH_P_IPV6))
4177 family = PF_INET6;
4178 else if (sock)
Paul Moore75e22912008-01-29 08:38:04 -05004179 family = sock->sk->sk_family;
Paul Moore75e22912008-01-29 08:38:04 -05004180 else
4181 goto out;
4182
4183 if (sock && family == PF_UNIX)
Ahmed S. Darwish713a04ae2008-03-01 21:52:30 +02004184 selinux_inode_getsecid(SOCK_INODE(sock), &peer_secid);
Paul Moore3de4bab2006-11-17 17:38:54 -05004185 else if (skb)
Paul Moore220deb92008-01-29 08:38:23 -05004186 selinux_skb_peerlbl_sid(skb, family, &peer_secid);
Catherine Zhang2c7946a2006-03-20 22:41:23 -08004187
Paul Moore75e22912008-01-29 08:38:04 -05004188out:
Catherine Zhangdc49c1f2006-08-02 14:12:06 -07004189 *secid = peer_secid;
Paul Moore75e22912008-01-29 08:38:04 -05004190 if (peer_secid == SECSID_NULL)
4191 return -EINVAL;
4192 return 0;
Catherine Zhang2c7946a2006-03-20 22:41:23 -08004193}
4194
Al Viro7d877f32005-10-21 03:20:43 -04004195static int selinux_sk_alloc_security(struct sock *sk, int family, gfp_t priority)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004196{
4197 return sk_alloc_security(sk, family, priority);
4198}
4199
4200static void selinux_sk_free_security(struct sock *sk)
4201{
4202 sk_free_security(sk);
4203}
4204
Venkat Yekkirala892c1412006-08-04 23:08:56 -07004205static void selinux_sk_clone_security(const struct sock *sk, struct sock *newsk)
4206{
4207 struct sk_security_struct *ssec = sk->sk_security;
4208 struct sk_security_struct *newssec = newsk->sk_security;
4209
4210 newssec->sid = ssec->sid;
4211 newssec->peer_sid = ssec->peer_sid;
Paul Moore220deb92008-01-29 08:38:23 -05004212 newssec->sclass = ssec->sclass;
Paul Moore99f59ed2006-08-29 17:53:48 -07004213
Paul Moore389fb8002009-03-27 17:10:34 -04004214 selinux_netlbl_sk_security_reset(newssec);
Venkat Yekkirala892c1412006-08-04 23:08:56 -07004215}
4216
Venkat Yekkiralabeb8d132006-08-04 23:12:42 -07004217static void selinux_sk_getsecid(struct sock *sk, u32 *secid)
Trent Jaegerd28d1e02005-12-13 23:12:40 -08004218{
Trent Jaegerd28d1e02005-12-13 23:12:40 -08004219 if (!sk)
Venkat Yekkiralabeb8d132006-08-04 23:12:42 -07004220 *secid = SECINITSID_ANY_SOCKET;
Venkat Yekkirala892c1412006-08-04 23:08:56 -07004221 else {
4222 struct sk_security_struct *sksec = sk->sk_security;
Trent Jaegerd28d1e02005-12-13 23:12:40 -08004223
Venkat Yekkiralabeb8d132006-08-04 23:12:42 -07004224 *secid = sksec->sid;
Venkat Yekkirala892c1412006-08-04 23:08:56 -07004225 }
Trent Jaegerd28d1e02005-12-13 23:12:40 -08004226}
4227
Eric Paris828dfe12008-04-17 13:17:49 -04004228static void selinux_sock_graft(struct sock *sk, struct socket *parent)
Venkat Yekkirala4237c752006-07-24 23:32:50 -07004229{
4230 struct inode_security_struct *isec = SOCK_INODE(parent)->i_security;
4231 struct sk_security_struct *sksec = sk->sk_security;
4232
David Woodhouse2148ccc2006-09-29 15:50:25 -07004233 if (sk->sk_family == PF_INET || sk->sk_family == PF_INET6 ||
4234 sk->sk_family == PF_UNIX)
4235 isec->sid = sksec->sid;
Paul Moore220deb92008-01-29 08:38:23 -05004236 sksec->sclass = isec->sclass;
Venkat Yekkirala4237c752006-07-24 23:32:50 -07004237}
4238
Adrian Bunk9a673e52006-08-15 00:03:53 -07004239static int selinux_inet_conn_request(struct sock *sk, struct sk_buff *skb,
4240 struct request_sock *req)
Venkat Yekkirala4237c752006-07-24 23:32:50 -07004241{
4242 struct sk_security_struct *sksec = sk->sk_security;
4243 int err;
Paul Mooreaa862902008-10-10 10:16:29 -04004244 u16 family = sk->sk_family;
Venkat Yekkirala7420ed22006-08-04 23:17:57 -07004245 u32 newsid;
Venkat Yekkirala4237c752006-07-24 23:32:50 -07004246 u32 peersid;
4247
Paul Mooreaa862902008-10-10 10:16:29 -04004248 /* handle mapped IPv4 packets arriving via IPv6 sockets */
4249 if (family == PF_INET6 && skb->protocol == htons(ETH_P_IP))
4250 family = PF_INET;
4251
4252 err = selinux_skb_peerlbl_sid(skb, family, &peersid);
Paul Moore220deb92008-01-29 08:38:23 -05004253 if (err)
4254 return err;
Venkat Yekkiralaa51c64f2006-07-27 22:01:34 -07004255 if (peersid == SECSID_NULL) {
4256 req->secid = sksec->sid;
Paul Moore3de4bab2006-11-17 17:38:54 -05004257 req->peer_secid = SECSID_NULL;
Paul Moore389fb8002009-03-27 17:10:34 -04004258 } else {
4259 err = security_sid_mls_copy(sksec->sid, peersid, &newsid);
4260 if (err)
4261 return err;
4262 req->secid = newsid;
4263 req->peer_secid = peersid;
Venkat Yekkiralaa51c64f2006-07-27 22:01:34 -07004264 }
4265
Paul Moore389fb8002009-03-27 17:10:34 -04004266 return selinux_netlbl_inet_conn_request(req, family);
Venkat Yekkirala4237c752006-07-24 23:32:50 -07004267}
4268
Adrian Bunk9a673e52006-08-15 00:03:53 -07004269static void selinux_inet_csk_clone(struct sock *newsk,
4270 const struct request_sock *req)
Venkat Yekkirala4237c752006-07-24 23:32:50 -07004271{
4272 struct sk_security_struct *newsksec = newsk->sk_security;
4273
4274 newsksec->sid = req->secid;
Venkat Yekkirala6b877692006-11-08 17:04:09 -06004275 newsksec->peer_sid = req->peer_secid;
Venkat Yekkirala4237c752006-07-24 23:32:50 -07004276 /* NOTE: Ideally, we should also get the isec->sid for the
4277 new socket in sync, but we don't have the isec available yet.
4278 So we will wait until sock_graft to do it, by which
4279 time it will have been created and available. */
Paul Moore99f59ed2006-08-29 17:53:48 -07004280
Paul Moore9f2ad662006-11-17 17:38:53 -05004281 /* We don't need to take any sort of lock here as we are the only
4282 * thread with access to newsksec */
Paul Moore389fb8002009-03-27 17:10:34 -04004283 selinux_netlbl_inet_csk_clone(newsk, req->rsk_ops->family);
Venkat Yekkirala4237c752006-07-24 23:32:50 -07004284}
4285
Paul Moore014ab192008-10-10 10:16:33 -04004286static void selinux_inet_conn_established(struct sock *sk, struct sk_buff *skb)
Venkat Yekkirala6b877692006-11-08 17:04:09 -06004287{
Paul Mooreaa862902008-10-10 10:16:29 -04004288 u16 family = sk->sk_family;
Venkat Yekkirala6b877692006-11-08 17:04:09 -06004289 struct sk_security_struct *sksec = sk->sk_security;
4290
Paul Mooreaa862902008-10-10 10:16:29 -04004291 /* handle mapped IPv4 packets arriving via IPv6 sockets */
4292 if (family == PF_INET6 && skb->protocol == htons(ETH_P_IP))
4293 family = PF_INET;
4294
4295 selinux_skb_peerlbl_sid(skb, family, &sksec->peer_sid);
Venkat Yekkirala6b877692006-11-08 17:04:09 -06004296}
4297
Adrian Bunk9a673e52006-08-15 00:03:53 -07004298static void selinux_req_classify_flow(const struct request_sock *req,
4299 struct flowi *fl)
Venkat Yekkirala4237c752006-07-24 23:32:50 -07004300{
4301 fl->secid = req->secid;
4302}
4303
Linus Torvalds1da177e2005-04-16 15:20:36 -07004304static int selinux_nlmsg_perm(struct sock *sk, struct sk_buff *skb)
4305{
4306 int err = 0;
4307 u32 perm;
4308 struct nlmsghdr *nlh;
4309 struct socket *sock = sk->sk_socket;
4310 struct inode_security_struct *isec = SOCK_INODE(sock)->i_security;
Eric Paris828dfe12008-04-17 13:17:49 -04004311
Linus Torvalds1da177e2005-04-16 15:20:36 -07004312 if (skb->len < NLMSG_SPACE(0)) {
4313 err = -EINVAL;
4314 goto out;
4315 }
Arnaldo Carvalho de Melob529ccf2007-04-25 19:08:35 -07004316 nlh = nlmsg_hdr(skb);
Eric Paris828dfe12008-04-17 13:17:49 -04004317
Linus Torvalds1da177e2005-04-16 15:20:36 -07004318 err = selinux_nlmsg_lookup(isec->sclass, nlh->nlmsg_type, &perm);
4319 if (err) {
4320 if (err == -EINVAL) {
David Woodhouse9ad9ad32005-06-22 15:04:33 +01004321 audit_log(current->audit_context, GFP_KERNEL, AUDIT_SELINUX_ERR,
Linus Torvalds1da177e2005-04-16 15:20:36 -07004322 "SELinux: unrecognized netlink message"
4323 " type=%hu for sclass=%hu\n",
4324 nlh->nlmsg_type, isec->sclass);
Eric Paris39c9aed2008-11-05 09:34:42 -05004325 if (!selinux_enforcing || security_get_allow_unknown())
Linus Torvalds1da177e2005-04-16 15:20:36 -07004326 err = 0;
4327 }
4328
4329 /* Ignore */
4330 if (err == -ENOENT)
4331 err = 0;
4332 goto out;
4333 }
4334
4335 err = socket_has_perm(current, sock, perm);
4336out:
4337 return err;
4338}
4339
4340#ifdef CONFIG_NETFILTER
4341
Paul Mooreeffad8d2008-01-29 08:49:27 -05004342static unsigned int selinux_ip_forward(struct sk_buff *skb, int ifindex,
4343 u16 family)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004344{
Paul Mooredfaebe92008-10-10 10:16:31 -04004345 int err;
Paul Mooreeffad8d2008-01-29 08:49:27 -05004346 char *addrp;
4347 u32 peer_sid;
4348 struct avc_audit_data ad;
4349 u8 secmark_active;
Paul Moore948bf852008-10-10 10:16:32 -04004350 u8 netlbl_active;
Paul Mooreeffad8d2008-01-29 08:49:27 -05004351 u8 peerlbl_active;
Venkat Yekkirala4237c752006-07-24 23:32:50 -07004352
Paul Mooreeffad8d2008-01-29 08:49:27 -05004353 if (!selinux_policycap_netpeer)
4354 return NF_ACCEPT;
Venkat Yekkirala4237c752006-07-24 23:32:50 -07004355
Paul Mooreeffad8d2008-01-29 08:49:27 -05004356 secmark_active = selinux_secmark_enabled();
Paul Moore948bf852008-10-10 10:16:32 -04004357 netlbl_active = netlbl_enabled();
4358 peerlbl_active = netlbl_active || selinux_xfrm_enabled();
Paul Mooreeffad8d2008-01-29 08:49:27 -05004359 if (!secmark_active && !peerlbl_active)
4360 return NF_ACCEPT;
Venkat Yekkirala4237c752006-07-24 23:32:50 -07004361
Paul Moored8395c82008-10-10 10:16:30 -04004362 if (selinux_skb_peerlbl_sid(skb, family, &peer_sid) != 0)
4363 return NF_DROP;
4364
Paul Mooreeffad8d2008-01-29 08:49:27 -05004365 AVC_AUDIT_DATA_INIT(&ad, NET);
4366 ad.u.net.netif = ifindex;
4367 ad.u.net.family = family;
4368 if (selinux_parse_skb(skb, &ad, &addrp, 1, NULL) != 0)
4369 return NF_DROP;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004370
Paul Mooredfaebe92008-10-10 10:16:31 -04004371 if (peerlbl_active) {
4372 err = selinux_inet_sys_rcv_skb(ifindex, addrp, family,
4373 peer_sid, &ad);
4374 if (err) {
4375 selinux_netlbl_err(skb, err, 1);
Paul Mooreeffad8d2008-01-29 08:49:27 -05004376 return NF_DROP;
Paul Mooredfaebe92008-10-10 10:16:31 -04004377 }
4378 }
Paul Mooreeffad8d2008-01-29 08:49:27 -05004379
4380 if (secmark_active)
4381 if (avc_has_perm(peer_sid, skb->secmark,
4382 SECCLASS_PACKET, PACKET__FORWARD_IN, &ad))
4383 return NF_DROP;
4384
Paul Moore948bf852008-10-10 10:16:32 -04004385 if (netlbl_active)
4386 /* we do this in the FORWARD path and not the POST_ROUTING
4387 * path because we want to make sure we apply the necessary
4388 * labeling before IPsec is applied so we can leverage AH
4389 * protection */
4390 if (selinux_netlbl_skbuff_setsid(skb, family, peer_sid) != 0)
4391 return NF_DROP;
4392
Paul Mooreeffad8d2008-01-29 08:49:27 -05004393 return NF_ACCEPT;
4394}
4395
4396static unsigned int selinux_ipv4_forward(unsigned int hooknum,
4397 struct sk_buff *skb,
4398 const struct net_device *in,
4399 const struct net_device *out,
4400 int (*okfn)(struct sk_buff *))
4401{
4402 return selinux_ip_forward(skb, in->ifindex, PF_INET);
4403}
4404
4405#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
4406static unsigned int selinux_ipv6_forward(unsigned int hooknum,
4407 struct sk_buff *skb,
4408 const struct net_device *in,
4409 const struct net_device *out,
4410 int (*okfn)(struct sk_buff *))
4411{
4412 return selinux_ip_forward(skb, in->ifindex, PF_INET6);
4413}
4414#endif /* IPV6 */
4415
Paul Moore948bf852008-10-10 10:16:32 -04004416static unsigned int selinux_ip_output(struct sk_buff *skb,
4417 u16 family)
4418{
4419 u32 sid;
4420
4421 if (!netlbl_enabled())
4422 return NF_ACCEPT;
4423
4424 /* we do this in the LOCAL_OUT path and not the POST_ROUTING path
4425 * because we want to make sure we apply the necessary labeling
4426 * before IPsec is applied so we can leverage AH protection */
4427 if (skb->sk) {
4428 struct sk_security_struct *sksec = skb->sk->sk_security;
4429 sid = sksec->sid;
4430 } else
4431 sid = SECINITSID_KERNEL;
4432 if (selinux_netlbl_skbuff_setsid(skb, family, sid) != 0)
4433 return NF_DROP;
4434
4435 return NF_ACCEPT;
4436}
4437
4438static unsigned int selinux_ipv4_output(unsigned int hooknum,
4439 struct sk_buff *skb,
4440 const struct net_device *in,
4441 const struct net_device *out,
4442 int (*okfn)(struct sk_buff *))
4443{
4444 return selinux_ip_output(skb, PF_INET);
4445}
4446
Paul Mooreeffad8d2008-01-29 08:49:27 -05004447static unsigned int selinux_ip_postroute_compat(struct sk_buff *skb,
4448 int ifindex,
Paul Moored8395c82008-10-10 10:16:30 -04004449 u16 family)
James Morris4e5ab4c2006-06-09 00:33:33 -07004450{
Paul Mooreeffad8d2008-01-29 08:49:27 -05004451 struct sock *sk = skb->sk;
Venkat Yekkirala4237c752006-07-24 23:32:50 -07004452 struct sk_security_struct *sksec;
Paul Moored8395c82008-10-10 10:16:30 -04004453 struct avc_audit_data ad;
4454 char *addrp;
4455 u8 proto;
James Morris4e5ab4c2006-06-09 00:33:33 -07004456
Paul Mooreeffad8d2008-01-29 08:49:27 -05004457 if (sk == NULL)
4458 return NF_ACCEPT;
Venkat Yekkirala4237c752006-07-24 23:32:50 -07004459 sksec = sk->sk_security;
James Morris4e5ab4c2006-06-09 00:33:33 -07004460
Paul Moored8395c82008-10-10 10:16:30 -04004461 AVC_AUDIT_DATA_INIT(&ad, NET);
4462 ad.u.net.netif = ifindex;
4463 ad.u.net.family = family;
4464 if (selinux_parse_skb(skb, &ad, &addrp, 0, &proto))
4465 return NF_DROP;
4466
Paul Moore58bfbb52009-03-27 17:10:41 -04004467 if (selinux_secmark_enabled())
Paul Mooreeffad8d2008-01-29 08:49:27 -05004468 if (avc_has_perm(sksec->sid, skb->secmark,
Paul Moored8395c82008-10-10 10:16:30 -04004469 SECCLASS_PACKET, PACKET__SEND, &ad))
Paul Mooreeffad8d2008-01-29 08:49:27 -05004470 return NF_DROP;
James Morris4e5ab4c2006-06-09 00:33:33 -07004471
Paul Mooreeffad8d2008-01-29 08:49:27 -05004472 if (selinux_policycap_netpeer)
Paul Moored8395c82008-10-10 10:16:30 -04004473 if (selinux_xfrm_postroute_last(sksec->sid, skb, &ad, proto))
Paul Mooreeffad8d2008-01-29 08:49:27 -05004474 return NF_DROP;
James Morris4e5ab4c2006-06-09 00:33:33 -07004475
Paul Mooreeffad8d2008-01-29 08:49:27 -05004476 return NF_ACCEPT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004477}
4478
Paul Mooreeffad8d2008-01-29 08:49:27 -05004479static unsigned int selinux_ip_postroute(struct sk_buff *skb, int ifindex,
4480 u16 family)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004481{
Paul Mooreeffad8d2008-01-29 08:49:27 -05004482 u32 secmark_perm;
4483 u32 peer_sid;
4484 struct sock *sk;
4485 struct avc_audit_data ad;
4486 char *addrp;
Paul Mooreeffad8d2008-01-29 08:49:27 -05004487 u8 secmark_active;
4488 u8 peerlbl_active;
4489
Paul Mooreeffad8d2008-01-29 08:49:27 -05004490 /* If any sort of compatibility mode is enabled then handoff processing
4491 * to the selinux_ip_postroute_compat() function to deal with the
4492 * special handling. We do this in an attempt to keep this function
4493 * as fast and as clean as possible. */
Paul Moore58bfbb52009-03-27 17:10:41 -04004494 if (!selinux_policycap_netpeer)
Paul Moored8395c82008-10-10 10:16:30 -04004495 return selinux_ip_postroute_compat(skb, ifindex, family);
Alexey Dobriyandef8b4f2008-10-28 13:24:06 -07004496#ifdef CONFIG_XFRM
Paul Mooreeffad8d2008-01-29 08:49:27 -05004497 /* If skb->dst->xfrm is non-NULL then the packet is undergoing an IPsec
4498 * packet transformation so allow the packet to pass without any checks
4499 * since we'll have another chance to perform access control checks
4500 * when the packet is on it's final way out.
4501 * NOTE: there appear to be some IPv6 multicast cases where skb->dst
4502 * is NULL, in this case go ahead and apply access control. */
Eric Dumazetadf30902009-06-02 05:19:30 +00004503 if (skb_dst(skb) != NULL && skb_dst(skb)->xfrm != NULL)
Paul Mooreeffad8d2008-01-29 08:49:27 -05004504 return NF_ACCEPT;
Alexey Dobriyandef8b4f2008-10-28 13:24:06 -07004505#endif
Paul Mooreeffad8d2008-01-29 08:49:27 -05004506 secmark_active = selinux_secmark_enabled();
4507 peerlbl_active = netlbl_enabled() || selinux_xfrm_enabled();
4508 if (!secmark_active && !peerlbl_active)
4509 return NF_ACCEPT;
4510
Paul Moored8395c82008-10-10 10:16:30 -04004511 /* if the packet is being forwarded then get the peer label from the
4512 * packet itself; otherwise check to see if it is from a local
4513 * application or the kernel, if from an application get the peer label
4514 * from the sending socket, otherwise use the kernel's sid */
Paul Mooreeffad8d2008-01-29 08:49:27 -05004515 sk = skb->sk;
Paul Moored8395c82008-10-10 10:16:30 -04004516 if (sk == NULL) {
4517 switch (family) {
4518 case PF_INET:
4519 if (IPCB(skb)->flags & IPSKB_FORWARDED)
4520 secmark_perm = PACKET__FORWARD_OUT;
4521 else
4522 secmark_perm = PACKET__SEND;
4523 break;
4524 case PF_INET6:
4525 if (IP6CB(skb)->flags & IP6SKB_FORWARDED)
4526 secmark_perm = PACKET__FORWARD_OUT;
4527 else
4528 secmark_perm = PACKET__SEND;
4529 break;
4530 default:
4531 return NF_DROP;
4532 }
4533 if (secmark_perm == PACKET__FORWARD_OUT) {
4534 if (selinux_skb_peerlbl_sid(skb, family, &peer_sid))
4535 return NF_DROP;
4536 } else
4537 peer_sid = SECINITSID_KERNEL;
4538 } else {
Paul Mooreeffad8d2008-01-29 08:49:27 -05004539 struct sk_security_struct *sksec = sk->sk_security;
4540 peer_sid = sksec->sid;
4541 secmark_perm = PACKET__SEND;
Paul Mooreeffad8d2008-01-29 08:49:27 -05004542 }
4543
Paul Moored8395c82008-10-10 10:16:30 -04004544 AVC_AUDIT_DATA_INIT(&ad, NET);
4545 ad.u.net.netif = ifindex;
4546 ad.u.net.family = family;
4547 if (selinux_parse_skb(skb, &ad, &addrp, 0, NULL))
4548 return NF_DROP;
4549
Paul Mooreeffad8d2008-01-29 08:49:27 -05004550 if (secmark_active)
4551 if (avc_has_perm(peer_sid, skb->secmark,
4552 SECCLASS_PACKET, secmark_perm, &ad))
4553 return NF_DROP;
4554
4555 if (peerlbl_active) {
4556 u32 if_sid;
4557 u32 node_sid;
4558
4559 if (sel_netif_sid(ifindex, &if_sid))
4560 return NF_DROP;
4561 if (avc_has_perm(peer_sid, if_sid,
4562 SECCLASS_NETIF, NETIF__EGRESS, &ad))
4563 return NF_DROP;
4564
4565 if (sel_netnode_sid(addrp, family, &node_sid))
4566 return NF_DROP;
4567 if (avc_has_perm(peer_sid, node_sid,
4568 SECCLASS_NODE, NODE__SENDTO, &ad))
4569 return NF_DROP;
4570 }
4571
4572 return NF_ACCEPT;
4573}
4574
4575static unsigned int selinux_ipv4_postroute(unsigned int hooknum,
4576 struct sk_buff *skb,
4577 const struct net_device *in,
4578 const struct net_device *out,
4579 int (*okfn)(struct sk_buff *))
4580{
4581 return selinux_ip_postroute(skb, out->ifindex, PF_INET);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004582}
4583
4584#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
Paul Mooreeffad8d2008-01-29 08:49:27 -05004585static unsigned int selinux_ipv6_postroute(unsigned int hooknum,
4586 struct sk_buff *skb,
4587 const struct net_device *in,
4588 const struct net_device *out,
4589 int (*okfn)(struct sk_buff *))
Linus Torvalds1da177e2005-04-16 15:20:36 -07004590{
Paul Mooreeffad8d2008-01-29 08:49:27 -05004591 return selinux_ip_postroute(skb, out->ifindex, PF_INET6);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004592}
Linus Torvalds1da177e2005-04-16 15:20:36 -07004593#endif /* IPV6 */
4594
4595#endif /* CONFIG_NETFILTER */
4596
Linus Torvalds1da177e2005-04-16 15:20:36 -07004597static int selinux_netlink_send(struct sock *sk, struct sk_buff *skb)
4598{
Linus Torvalds1da177e2005-04-16 15:20:36 -07004599 int err;
4600
Eric Paris200ac532009-02-12 15:01:04 -05004601 err = cap_netlink_send(sk, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004602 if (err)
4603 return err;
4604
Linus Torvalds1da177e2005-04-16 15:20:36 -07004605 if (policydb_loaded_version >= POLICYDB_VERSION_NLCLASS)
4606 err = selinux_nlmsg_perm(sk, skb);
4607
4608 return err;
4609}
4610
Darrel Goeddelc7bdb542006-06-27 13:26:11 -07004611static int selinux_netlink_recv(struct sk_buff *skb, int capability)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004612{
Darrel Goeddelc7bdb542006-06-27 13:26:11 -07004613 int err;
4614 struct avc_audit_data ad;
4615
Eric Paris200ac532009-02-12 15:01:04 -05004616 err = cap_netlink_recv(skb, capability);
Darrel Goeddelc7bdb542006-06-27 13:26:11 -07004617 if (err)
4618 return err;
4619
4620 AVC_AUDIT_DATA_INIT(&ad, CAP);
4621 ad.u.cap = capability;
4622
4623 return avc_has_perm(NETLINK_CB(skb).sid, NETLINK_CB(skb).sid,
Eric Paris828dfe12008-04-17 13:17:49 -04004624 SECCLASS_CAPABILITY, CAP_TO_MASK(capability), &ad);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004625}
4626
4627static int ipc_alloc_security(struct task_struct *task,
4628 struct kern_ipc_perm *perm,
4629 u16 sclass)
4630{
Linus Torvalds1da177e2005-04-16 15:20:36 -07004631 struct ipc_security_struct *isec;
David Howells275bb412008-11-14 10:39:19 +11004632 u32 sid;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004633
James Morris89d155e2005-10-30 14:59:21 -08004634 isec = kzalloc(sizeof(struct ipc_security_struct), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004635 if (!isec)
4636 return -ENOMEM;
4637
David Howells275bb412008-11-14 10:39:19 +11004638 sid = task_sid(task);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004639 isec->sclass = sclass;
David Howells275bb412008-11-14 10:39:19 +11004640 isec->sid = sid;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004641 perm->security = isec;
4642
4643 return 0;
4644}
4645
4646static void ipc_free_security(struct kern_ipc_perm *perm)
4647{
4648 struct ipc_security_struct *isec = perm->security;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004649 perm->security = NULL;
4650 kfree(isec);
4651}
4652
4653static int msg_msg_alloc_security(struct msg_msg *msg)
4654{
4655 struct msg_security_struct *msec;
4656
James Morris89d155e2005-10-30 14:59:21 -08004657 msec = kzalloc(sizeof(struct msg_security_struct), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004658 if (!msec)
4659 return -ENOMEM;
4660
Linus Torvalds1da177e2005-04-16 15:20:36 -07004661 msec->sid = SECINITSID_UNLABELED;
4662 msg->security = msec;
4663
4664 return 0;
4665}
4666
4667static void msg_msg_free_security(struct msg_msg *msg)
4668{
4669 struct msg_security_struct *msec = msg->security;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004670
4671 msg->security = NULL;
4672 kfree(msec);
4673}
4674
4675static int ipc_has_perm(struct kern_ipc_perm *ipc_perms,
Stephen Smalley6af963f2005-05-01 08:58:39 -07004676 u32 perms)
Linus Torvalds1da177e2005-04-16 15:20:36 -07004677{
Linus Torvalds1da177e2005-04-16 15:20:36 -07004678 struct ipc_security_struct *isec;
4679 struct avc_audit_data ad;
David Howells275bb412008-11-14 10:39:19 +11004680 u32 sid = current_sid();
Linus Torvalds1da177e2005-04-16 15:20:36 -07004681
Linus Torvalds1da177e2005-04-16 15:20:36 -07004682 isec = ipc_perms->security;
4683
4684 AVC_AUDIT_DATA_INIT(&ad, IPC);
4685 ad.u.ipc_id = ipc_perms->key;
4686
David Howells275bb412008-11-14 10:39:19 +11004687 return avc_has_perm(sid, isec->sid, isec->sclass, perms, &ad);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004688}
4689
4690static int selinux_msg_msg_alloc_security(struct msg_msg *msg)
4691{
4692 return msg_msg_alloc_security(msg);
4693}
4694
4695static void selinux_msg_msg_free_security(struct msg_msg *msg)
4696{
4697 msg_msg_free_security(msg);
4698}
4699
4700/* message queue security operations */
4701static int selinux_msg_queue_alloc_security(struct msg_queue *msq)
4702{
Linus Torvalds1da177e2005-04-16 15:20:36 -07004703 struct ipc_security_struct *isec;
4704 struct avc_audit_data ad;
David Howells275bb412008-11-14 10:39:19 +11004705 u32 sid = current_sid();
Linus Torvalds1da177e2005-04-16 15:20:36 -07004706 int rc;
4707
4708 rc = ipc_alloc_security(current, &msq->q_perm, SECCLASS_MSGQ);
4709 if (rc)
4710 return rc;
4711
Linus Torvalds1da177e2005-04-16 15:20:36 -07004712 isec = msq->q_perm.security;
4713
4714 AVC_AUDIT_DATA_INIT(&ad, IPC);
Eric Paris828dfe12008-04-17 13:17:49 -04004715 ad.u.ipc_id = msq->q_perm.key;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004716
David Howells275bb412008-11-14 10:39:19 +11004717 rc = avc_has_perm(sid, isec->sid, SECCLASS_MSGQ,
Linus Torvalds1da177e2005-04-16 15:20:36 -07004718 MSGQ__CREATE, &ad);
4719 if (rc) {
4720 ipc_free_security(&msq->q_perm);
4721 return rc;
4722 }
4723 return 0;
4724}
4725
4726static void selinux_msg_queue_free_security(struct msg_queue *msq)
4727{
4728 ipc_free_security(&msq->q_perm);
4729}
4730
4731static int selinux_msg_queue_associate(struct msg_queue *msq, int msqflg)
4732{
Linus Torvalds1da177e2005-04-16 15:20:36 -07004733 struct ipc_security_struct *isec;
4734 struct avc_audit_data ad;
David Howells275bb412008-11-14 10:39:19 +11004735 u32 sid = current_sid();
Linus Torvalds1da177e2005-04-16 15:20:36 -07004736
Linus Torvalds1da177e2005-04-16 15:20:36 -07004737 isec = msq->q_perm.security;
4738
4739 AVC_AUDIT_DATA_INIT(&ad, IPC);
4740 ad.u.ipc_id = msq->q_perm.key;
4741
David Howells275bb412008-11-14 10:39:19 +11004742 return avc_has_perm(sid, isec->sid, SECCLASS_MSGQ,
Linus Torvalds1da177e2005-04-16 15:20:36 -07004743 MSGQ__ASSOCIATE, &ad);
4744}
4745
4746static int selinux_msg_queue_msgctl(struct msg_queue *msq, int cmd)
4747{
4748 int err;
4749 int perms;
4750
Eric Paris828dfe12008-04-17 13:17:49 -04004751 switch (cmd) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07004752 case IPC_INFO:
4753 case MSG_INFO:
4754 /* No specific object, just general system-wide information. */
4755 return task_has_system(current, SYSTEM__IPC_INFO);
4756 case IPC_STAT:
4757 case MSG_STAT:
4758 perms = MSGQ__GETATTR | MSGQ__ASSOCIATE;
4759 break;
4760 case IPC_SET:
4761 perms = MSGQ__SETATTR;
4762 break;
4763 case IPC_RMID:
4764 perms = MSGQ__DESTROY;
4765 break;
4766 default:
4767 return 0;
4768 }
4769
Stephen Smalley6af963f2005-05-01 08:58:39 -07004770 err = ipc_has_perm(&msq->q_perm, perms);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004771 return err;
4772}
4773
4774static int selinux_msg_queue_msgsnd(struct msg_queue *msq, struct msg_msg *msg, int msqflg)
4775{
Linus Torvalds1da177e2005-04-16 15:20:36 -07004776 struct ipc_security_struct *isec;
4777 struct msg_security_struct *msec;
4778 struct avc_audit_data ad;
David Howells275bb412008-11-14 10:39:19 +11004779 u32 sid = current_sid();
Linus Torvalds1da177e2005-04-16 15:20:36 -07004780 int rc;
4781
Linus Torvalds1da177e2005-04-16 15:20:36 -07004782 isec = msq->q_perm.security;
4783 msec = msg->security;
4784
4785 /*
4786 * First time through, need to assign label to the message
4787 */
4788 if (msec->sid == SECINITSID_UNLABELED) {
4789 /*
4790 * Compute new sid based on current process and
4791 * message queue this message will be stored in
4792 */
David Howells275bb412008-11-14 10:39:19 +11004793 rc = security_transition_sid(sid, isec->sid, SECCLASS_MSG,
Linus Torvalds1da177e2005-04-16 15:20:36 -07004794 &msec->sid);
4795 if (rc)
4796 return rc;
4797 }
4798
4799 AVC_AUDIT_DATA_INIT(&ad, IPC);
4800 ad.u.ipc_id = msq->q_perm.key;
4801
4802 /* Can this process write to the queue? */
David Howells275bb412008-11-14 10:39:19 +11004803 rc = avc_has_perm(sid, isec->sid, SECCLASS_MSGQ,
Linus Torvalds1da177e2005-04-16 15:20:36 -07004804 MSGQ__WRITE, &ad);
4805 if (!rc)
4806 /* Can this process send the message */
David Howells275bb412008-11-14 10:39:19 +11004807 rc = avc_has_perm(sid, msec->sid, SECCLASS_MSG,
4808 MSG__SEND, &ad);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004809 if (!rc)
4810 /* Can the message be put in the queue? */
David Howells275bb412008-11-14 10:39:19 +11004811 rc = avc_has_perm(msec->sid, isec->sid, SECCLASS_MSGQ,
4812 MSGQ__ENQUEUE, &ad);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004813
4814 return rc;
4815}
4816
4817static int selinux_msg_queue_msgrcv(struct msg_queue *msq, struct msg_msg *msg,
4818 struct task_struct *target,
4819 long type, int mode)
4820{
Linus Torvalds1da177e2005-04-16 15:20:36 -07004821 struct ipc_security_struct *isec;
4822 struct msg_security_struct *msec;
4823 struct avc_audit_data ad;
David Howells275bb412008-11-14 10:39:19 +11004824 u32 sid = task_sid(target);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004825 int rc;
4826
Linus Torvalds1da177e2005-04-16 15:20:36 -07004827 isec = msq->q_perm.security;
4828 msec = msg->security;
4829
4830 AVC_AUDIT_DATA_INIT(&ad, IPC);
Eric Paris828dfe12008-04-17 13:17:49 -04004831 ad.u.ipc_id = msq->q_perm.key;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004832
David Howells275bb412008-11-14 10:39:19 +11004833 rc = avc_has_perm(sid, isec->sid,
Linus Torvalds1da177e2005-04-16 15:20:36 -07004834 SECCLASS_MSGQ, MSGQ__READ, &ad);
4835 if (!rc)
David Howells275bb412008-11-14 10:39:19 +11004836 rc = avc_has_perm(sid, msec->sid,
Linus Torvalds1da177e2005-04-16 15:20:36 -07004837 SECCLASS_MSG, MSG__RECEIVE, &ad);
4838 return rc;
4839}
4840
4841/* Shared Memory security operations */
4842static int selinux_shm_alloc_security(struct shmid_kernel *shp)
4843{
Linus Torvalds1da177e2005-04-16 15:20:36 -07004844 struct ipc_security_struct *isec;
4845 struct avc_audit_data ad;
David Howells275bb412008-11-14 10:39:19 +11004846 u32 sid = current_sid();
Linus Torvalds1da177e2005-04-16 15:20:36 -07004847 int rc;
4848
4849 rc = ipc_alloc_security(current, &shp->shm_perm, SECCLASS_SHM);
4850 if (rc)
4851 return rc;
4852
Linus Torvalds1da177e2005-04-16 15:20:36 -07004853 isec = shp->shm_perm.security;
4854
4855 AVC_AUDIT_DATA_INIT(&ad, IPC);
Eric Paris828dfe12008-04-17 13:17:49 -04004856 ad.u.ipc_id = shp->shm_perm.key;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004857
David Howells275bb412008-11-14 10:39:19 +11004858 rc = avc_has_perm(sid, isec->sid, SECCLASS_SHM,
Linus Torvalds1da177e2005-04-16 15:20:36 -07004859 SHM__CREATE, &ad);
4860 if (rc) {
4861 ipc_free_security(&shp->shm_perm);
4862 return rc;
4863 }
4864 return 0;
4865}
4866
4867static void selinux_shm_free_security(struct shmid_kernel *shp)
4868{
4869 ipc_free_security(&shp->shm_perm);
4870}
4871
4872static int selinux_shm_associate(struct shmid_kernel *shp, int shmflg)
4873{
Linus Torvalds1da177e2005-04-16 15:20:36 -07004874 struct ipc_security_struct *isec;
4875 struct avc_audit_data ad;
David Howells275bb412008-11-14 10:39:19 +11004876 u32 sid = current_sid();
Linus Torvalds1da177e2005-04-16 15:20:36 -07004877
Linus Torvalds1da177e2005-04-16 15:20:36 -07004878 isec = shp->shm_perm.security;
4879
4880 AVC_AUDIT_DATA_INIT(&ad, IPC);
4881 ad.u.ipc_id = shp->shm_perm.key;
4882
David Howells275bb412008-11-14 10:39:19 +11004883 return avc_has_perm(sid, isec->sid, SECCLASS_SHM,
Linus Torvalds1da177e2005-04-16 15:20:36 -07004884 SHM__ASSOCIATE, &ad);
4885}
4886
4887/* Note, at this point, shp is locked down */
4888static int selinux_shm_shmctl(struct shmid_kernel *shp, int cmd)
4889{
4890 int perms;
4891 int err;
4892
Eric Paris828dfe12008-04-17 13:17:49 -04004893 switch (cmd) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07004894 case IPC_INFO:
4895 case SHM_INFO:
4896 /* No specific object, just general system-wide information. */
4897 return task_has_system(current, SYSTEM__IPC_INFO);
4898 case IPC_STAT:
4899 case SHM_STAT:
4900 perms = SHM__GETATTR | SHM__ASSOCIATE;
4901 break;
4902 case IPC_SET:
4903 perms = SHM__SETATTR;
4904 break;
4905 case SHM_LOCK:
4906 case SHM_UNLOCK:
4907 perms = SHM__LOCK;
4908 break;
4909 case IPC_RMID:
4910 perms = SHM__DESTROY;
4911 break;
4912 default:
4913 return 0;
4914 }
4915
Stephen Smalley6af963f2005-05-01 08:58:39 -07004916 err = ipc_has_perm(&shp->shm_perm, perms);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004917 return err;
4918}
4919
4920static int selinux_shm_shmat(struct shmid_kernel *shp,
4921 char __user *shmaddr, int shmflg)
4922{
4923 u32 perms;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004924
4925 if (shmflg & SHM_RDONLY)
4926 perms = SHM__READ;
4927 else
4928 perms = SHM__READ | SHM__WRITE;
4929
Stephen Smalley6af963f2005-05-01 08:58:39 -07004930 return ipc_has_perm(&shp->shm_perm, perms);
Linus Torvalds1da177e2005-04-16 15:20:36 -07004931}
4932
4933/* Semaphore security operations */
4934static int selinux_sem_alloc_security(struct sem_array *sma)
4935{
Linus Torvalds1da177e2005-04-16 15:20:36 -07004936 struct ipc_security_struct *isec;
4937 struct avc_audit_data ad;
David Howells275bb412008-11-14 10:39:19 +11004938 u32 sid = current_sid();
Linus Torvalds1da177e2005-04-16 15:20:36 -07004939 int rc;
4940
4941 rc = ipc_alloc_security(current, &sma->sem_perm, SECCLASS_SEM);
4942 if (rc)
4943 return rc;
4944
Linus Torvalds1da177e2005-04-16 15:20:36 -07004945 isec = sma->sem_perm.security;
4946
4947 AVC_AUDIT_DATA_INIT(&ad, IPC);
Eric Paris828dfe12008-04-17 13:17:49 -04004948 ad.u.ipc_id = sma->sem_perm.key;
Linus Torvalds1da177e2005-04-16 15:20:36 -07004949
David Howells275bb412008-11-14 10:39:19 +11004950 rc = avc_has_perm(sid, isec->sid, SECCLASS_SEM,
Linus Torvalds1da177e2005-04-16 15:20:36 -07004951 SEM__CREATE, &ad);
4952 if (rc) {
4953 ipc_free_security(&sma->sem_perm);
4954 return rc;
4955 }
4956 return 0;
4957}
4958
4959static void selinux_sem_free_security(struct sem_array *sma)
4960{
4961 ipc_free_security(&sma->sem_perm);
4962}
4963
4964static int selinux_sem_associate(struct sem_array *sma, int semflg)
4965{
Linus Torvalds1da177e2005-04-16 15:20:36 -07004966 struct ipc_security_struct *isec;
4967 struct avc_audit_data ad;
David Howells275bb412008-11-14 10:39:19 +11004968 u32 sid = current_sid();
Linus Torvalds1da177e2005-04-16 15:20:36 -07004969
Linus Torvalds1da177e2005-04-16 15:20:36 -07004970 isec = sma->sem_perm.security;
4971
4972 AVC_AUDIT_DATA_INIT(&ad, IPC);
4973 ad.u.ipc_id = sma->sem_perm.key;
4974
David Howells275bb412008-11-14 10:39:19 +11004975 return avc_has_perm(sid, isec->sid, SECCLASS_SEM,
Linus Torvalds1da177e2005-04-16 15:20:36 -07004976 SEM__ASSOCIATE, &ad);
4977}
4978
4979/* Note, at this point, sma is locked down */
4980static int selinux_sem_semctl(struct sem_array *sma, int cmd)
4981{
4982 int err;
4983 u32 perms;
4984
Eric Paris828dfe12008-04-17 13:17:49 -04004985 switch (cmd) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07004986 case IPC_INFO:
4987 case SEM_INFO:
4988 /* No specific object, just general system-wide information. */
4989 return task_has_system(current, SYSTEM__IPC_INFO);
4990 case GETPID:
4991 case GETNCNT:
4992 case GETZCNT:
4993 perms = SEM__GETATTR;
4994 break;
4995 case GETVAL:
4996 case GETALL:
4997 perms = SEM__READ;
4998 break;
4999 case SETVAL:
5000 case SETALL:
5001 perms = SEM__WRITE;
5002 break;
5003 case IPC_RMID:
5004 perms = SEM__DESTROY;
5005 break;
5006 case IPC_SET:
5007 perms = SEM__SETATTR;
5008 break;
5009 case IPC_STAT:
5010 case SEM_STAT:
5011 perms = SEM__GETATTR | SEM__ASSOCIATE;
5012 break;
5013 default:
5014 return 0;
5015 }
5016
Stephen Smalley6af963f2005-05-01 08:58:39 -07005017 err = ipc_has_perm(&sma->sem_perm, perms);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005018 return err;
5019}
5020
5021static int selinux_sem_semop(struct sem_array *sma,
5022 struct sembuf *sops, unsigned nsops, int alter)
5023{
5024 u32 perms;
5025
5026 if (alter)
5027 perms = SEM__READ | SEM__WRITE;
5028 else
5029 perms = SEM__READ;
5030
Stephen Smalley6af963f2005-05-01 08:58:39 -07005031 return ipc_has_perm(&sma->sem_perm, perms);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005032}
5033
5034static int selinux_ipc_permission(struct kern_ipc_perm *ipcp, short flag)
5035{
Linus Torvalds1da177e2005-04-16 15:20:36 -07005036 u32 av = 0;
5037
Linus Torvalds1da177e2005-04-16 15:20:36 -07005038 av = 0;
5039 if (flag & S_IRUGO)
5040 av |= IPC__UNIX_READ;
5041 if (flag & S_IWUGO)
5042 av |= IPC__UNIX_WRITE;
5043
5044 if (av == 0)
5045 return 0;
5046
Stephen Smalley6af963f2005-05-01 08:58:39 -07005047 return ipc_has_perm(ipcp, av);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005048}
5049
Ahmed S. Darwish713a04ae2008-03-01 21:52:30 +02005050static void selinux_ipc_getsecid(struct kern_ipc_perm *ipcp, u32 *secid)
5051{
5052 struct ipc_security_struct *isec = ipcp->security;
5053 *secid = isec->sid;
5054}
5055
Eric Paris828dfe12008-04-17 13:17:49 -04005056static void selinux_d_instantiate(struct dentry *dentry, struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -07005057{
5058 if (inode)
5059 inode_doinit_with_dentry(inode, dentry);
5060}
5061
5062static int selinux_getprocattr(struct task_struct *p,
Al Viro04ff9702007-03-12 16:17:58 +00005063 char *name, char **value)
Linus Torvalds1da177e2005-04-16 15:20:36 -07005064{
David Howells275bb412008-11-14 10:39:19 +11005065 const struct task_security_struct *__tsec;
Dustin Kirkland8c8570f2005-11-03 17:15:16 +00005066 u32 sid;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005067 int error;
Al Viro04ff9702007-03-12 16:17:58 +00005068 unsigned len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005069
5070 if (current != p) {
David Howells3b11a1d2008-11-14 10:39:26 +11005071 error = current_has_perm(p, PROCESS__GETATTR);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005072 if (error)
5073 return error;
5074 }
5075
David Howells275bb412008-11-14 10:39:19 +11005076 rcu_read_lock();
5077 __tsec = __task_cred(p)->security;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005078
5079 if (!strcmp(name, "current"))
David Howells275bb412008-11-14 10:39:19 +11005080 sid = __tsec->sid;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005081 else if (!strcmp(name, "prev"))
David Howells275bb412008-11-14 10:39:19 +11005082 sid = __tsec->osid;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005083 else if (!strcmp(name, "exec"))
David Howells275bb412008-11-14 10:39:19 +11005084 sid = __tsec->exec_sid;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005085 else if (!strcmp(name, "fscreate"))
David Howells275bb412008-11-14 10:39:19 +11005086 sid = __tsec->create_sid;
Michael LeMay4eb582c2006-06-26 00:24:57 -07005087 else if (!strcmp(name, "keycreate"))
David Howells275bb412008-11-14 10:39:19 +11005088 sid = __tsec->keycreate_sid;
Eric Paris42c3e032006-06-26 00:26:03 -07005089 else if (!strcmp(name, "sockcreate"))
David Howells275bb412008-11-14 10:39:19 +11005090 sid = __tsec->sockcreate_sid;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005091 else
David Howells275bb412008-11-14 10:39:19 +11005092 goto invalid;
5093 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07005094
5095 if (!sid)
5096 return 0;
5097
Al Viro04ff9702007-03-12 16:17:58 +00005098 error = security_sid_to_context(sid, value, &len);
5099 if (error)
5100 return error;
5101 return len;
David Howells275bb412008-11-14 10:39:19 +11005102
5103invalid:
5104 rcu_read_unlock();
5105 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005106}
5107
5108static int selinux_setprocattr(struct task_struct *p,
5109 char *name, void *value, size_t size)
5110{
5111 struct task_security_struct *tsec;
Roland McGrath03563572008-03-26 15:46:39 -07005112 struct task_struct *tracer;
David Howellsd84f4f92008-11-14 10:39:23 +11005113 struct cred *new;
5114 u32 sid = 0, ptsid;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005115 int error;
5116 char *str = value;
5117
5118 if (current != p) {
5119 /* SELinux only allows a process to change its own
5120 security attributes. */
5121 return -EACCES;
5122 }
5123
5124 /*
5125 * Basic control over ability to set these attributes at all.
5126 * current == p, but we'll pass them separately in case the
5127 * above restriction is ever removed.
5128 */
5129 if (!strcmp(name, "exec"))
David Howells3b11a1d2008-11-14 10:39:26 +11005130 error = current_has_perm(p, PROCESS__SETEXEC);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005131 else if (!strcmp(name, "fscreate"))
David Howells3b11a1d2008-11-14 10:39:26 +11005132 error = current_has_perm(p, PROCESS__SETFSCREATE);
Michael LeMay4eb582c2006-06-26 00:24:57 -07005133 else if (!strcmp(name, "keycreate"))
David Howells3b11a1d2008-11-14 10:39:26 +11005134 error = current_has_perm(p, PROCESS__SETKEYCREATE);
Eric Paris42c3e032006-06-26 00:26:03 -07005135 else if (!strcmp(name, "sockcreate"))
David Howells3b11a1d2008-11-14 10:39:26 +11005136 error = current_has_perm(p, PROCESS__SETSOCKCREATE);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005137 else if (!strcmp(name, "current"))
David Howells3b11a1d2008-11-14 10:39:26 +11005138 error = current_has_perm(p, PROCESS__SETCURRENT);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005139 else
5140 error = -EINVAL;
5141 if (error)
5142 return error;
5143
5144 /* Obtain a SID for the context, if one was specified. */
5145 if (size && str[1] && str[1] != '\n') {
5146 if (str[size-1] == '\n') {
5147 str[size-1] = 0;
5148 size--;
5149 }
5150 error = security_context_to_sid(value, size, &sid);
Stephen Smalley12b29f32008-05-07 13:03:20 -04005151 if (error == -EINVAL && !strcmp(name, "fscreate")) {
5152 if (!capable(CAP_MAC_ADMIN))
5153 return error;
5154 error = security_context_to_sid_force(value, size,
5155 &sid);
5156 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07005157 if (error)
5158 return error;
5159 }
5160
David Howellsd84f4f92008-11-14 10:39:23 +11005161 new = prepare_creds();
5162 if (!new)
5163 return -ENOMEM;
5164
Linus Torvalds1da177e2005-04-16 15:20:36 -07005165 /* Permission checking based on the specified context is
5166 performed during the actual operation (execve,
5167 open/mkdir/...), when we know the full context of the
David Howellsd84f4f92008-11-14 10:39:23 +11005168 operation. See selinux_bprm_set_creds for the execve
Linus Torvalds1da177e2005-04-16 15:20:36 -07005169 checks and may_create for the file creation checks. The
5170 operation will then fail if the context is not permitted. */
David Howellsd84f4f92008-11-14 10:39:23 +11005171 tsec = new->security;
5172 if (!strcmp(name, "exec")) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07005173 tsec->exec_sid = sid;
David Howellsd84f4f92008-11-14 10:39:23 +11005174 } else if (!strcmp(name, "fscreate")) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07005175 tsec->create_sid = sid;
David Howellsd84f4f92008-11-14 10:39:23 +11005176 } else if (!strcmp(name, "keycreate")) {
Michael LeMay4eb582c2006-06-26 00:24:57 -07005177 error = may_create_key(sid, p);
5178 if (error)
David Howellsd84f4f92008-11-14 10:39:23 +11005179 goto abort_change;
Michael LeMay4eb582c2006-06-26 00:24:57 -07005180 tsec->keycreate_sid = sid;
David Howellsd84f4f92008-11-14 10:39:23 +11005181 } else if (!strcmp(name, "sockcreate")) {
Eric Paris42c3e032006-06-26 00:26:03 -07005182 tsec->sockcreate_sid = sid;
David Howellsd84f4f92008-11-14 10:39:23 +11005183 } else if (!strcmp(name, "current")) {
5184 error = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005185 if (sid == 0)
David Howellsd84f4f92008-11-14 10:39:23 +11005186 goto abort_change;
KaiGai Koheid9250de2008-08-28 16:35:57 +09005187
David Howellsd84f4f92008-11-14 10:39:23 +11005188 /* Only allow single threaded processes to change context */
5189 error = -EPERM;
5190 if (!is_single_threaded(p)) {
5191 error = security_bounded_transition(tsec->sid, sid);
5192 if (error)
5193 goto abort_change;
Eric Paris828dfe12008-04-17 13:17:49 -04005194 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07005195
5196 /* Check permissions for the transition. */
5197 error = avc_has_perm(tsec->sid, sid, SECCLASS_PROCESS,
Eric Paris828dfe12008-04-17 13:17:49 -04005198 PROCESS__DYNTRANSITION, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005199 if (error)
David Howellsd84f4f92008-11-14 10:39:23 +11005200 goto abort_change;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005201
5202 /* Check for ptracing, and update the task SID if ok.
5203 Otherwise, leave SID unchanged and fail. */
David Howellsd84f4f92008-11-14 10:39:23 +11005204 ptsid = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005205 task_lock(p);
Roland McGrath0d094ef2008-07-25 19:45:49 -07005206 tracer = tracehook_tracer_task(p);
David Howellsd84f4f92008-11-14 10:39:23 +11005207 if (tracer)
5208 ptsid = task_sid(tracer);
5209 task_unlock(p);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005210
David Howellsd84f4f92008-11-14 10:39:23 +11005211 if (tracer) {
5212 error = avc_has_perm(ptsid, sid, SECCLASS_PROCESS,
5213 PROCESS__PTRACE, NULL);
5214 if (error)
5215 goto abort_change;
5216 }
5217
5218 tsec->sid = sid;
5219 } else {
5220 error = -EINVAL;
5221 goto abort_change;
5222 }
5223
5224 commit_creds(new);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005225 return size;
David Howellsd84f4f92008-11-14 10:39:23 +11005226
5227abort_change:
5228 abort_creds(new);
5229 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005230}
5231
Catherine Zhangdc49c1f2006-08-02 14:12:06 -07005232static int selinux_secid_to_secctx(u32 secid, char **secdata, u32 *seclen)
5233{
5234 return security_sid_to_context(secid, secdata, seclen);
5235}
5236
David Howells7bf570d2008-04-29 20:52:51 +01005237static int selinux_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid)
David Howells63cb3442008-01-15 23:47:35 +00005238{
5239 return security_context_to_sid(secdata, seclen, secid);
5240}
5241
Catherine Zhangdc49c1f2006-08-02 14:12:06 -07005242static void selinux_release_secctx(char *secdata, u32 seclen)
5243{
Paul Moore088999e2007-08-01 11:12:58 -04005244 kfree(secdata);
Catherine Zhangdc49c1f2006-08-02 14:12:06 -07005245}
5246
Michael LeMayd7200242006-06-22 14:47:17 -07005247#ifdef CONFIG_KEYS
5248
David Howellsd84f4f92008-11-14 10:39:23 +11005249static int selinux_key_alloc(struct key *k, const struct cred *cred,
David Howells7e047ef2006-06-26 00:24:50 -07005250 unsigned long flags)
Michael LeMayd7200242006-06-22 14:47:17 -07005251{
David Howellsd84f4f92008-11-14 10:39:23 +11005252 const struct task_security_struct *tsec;
Michael LeMayd7200242006-06-22 14:47:17 -07005253 struct key_security_struct *ksec;
5254
5255 ksec = kzalloc(sizeof(struct key_security_struct), GFP_KERNEL);
5256 if (!ksec)
5257 return -ENOMEM;
5258
David Howellsd84f4f92008-11-14 10:39:23 +11005259 tsec = cred->security;
5260 if (tsec->keycreate_sid)
5261 ksec->sid = tsec->keycreate_sid;
Michael LeMay4eb582c2006-06-26 00:24:57 -07005262 else
David Howellsd84f4f92008-11-14 10:39:23 +11005263 ksec->sid = tsec->sid;
Michael LeMayd7200242006-06-22 14:47:17 -07005264
David Howells275bb412008-11-14 10:39:19 +11005265 k->security = ksec;
Michael LeMayd7200242006-06-22 14:47:17 -07005266 return 0;
5267}
5268
5269static void selinux_key_free(struct key *k)
5270{
5271 struct key_security_struct *ksec = k->security;
5272
5273 k->security = NULL;
5274 kfree(ksec);
5275}
5276
5277static int selinux_key_permission(key_ref_t key_ref,
David Howellsd84f4f92008-11-14 10:39:23 +11005278 const struct cred *cred,
5279 key_perm_t perm)
Michael LeMayd7200242006-06-22 14:47:17 -07005280{
5281 struct key *key;
Michael LeMayd7200242006-06-22 14:47:17 -07005282 struct key_security_struct *ksec;
David Howells275bb412008-11-14 10:39:19 +11005283 u32 sid;
Michael LeMayd7200242006-06-22 14:47:17 -07005284
5285 /* if no specific permissions are requested, we skip the
5286 permission check. No serious, additional covert channels
5287 appear to be created. */
5288 if (perm == 0)
5289 return 0;
5290
David Howellsd84f4f92008-11-14 10:39:23 +11005291 sid = cred_sid(cred);
David Howells275bb412008-11-14 10:39:19 +11005292
5293 key = key_ref_to_ptr(key_ref);
5294 ksec = key->security;
5295
5296 return avc_has_perm(sid, ksec->sid, SECCLASS_KEY, perm, NULL);
Michael LeMayd7200242006-06-22 14:47:17 -07005297}
5298
David Howells70a5bb72008-04-29 01:01:26 -07005299static int selinux_key_getsecurity(struct key *key, char **_buffer)
5300{
5301 struct key_security_struct *ksec = key->security;
5302 char *context = NULL;
5303 unsigned len;
5304 int rc;
5305
5306 rc = security_sid_to_context(ksec->sid, &context, &len);
5307 if (!rc)
5308 rc = len;
5309 *_buffer = context;
5310 return rc;
5311}
5312
Michael LeMayd7200242006-06-22 14:47:17 -07005313#endif
5314
Linus Torvalds1da177e2005-04-16 15:20:36 -07005315static struct security_operations selinux_ops = {
Ahmed S. Darwish076c54c2008-03-06 18:09:10 +02005316 .name = "selinux",
5317
David Howells5cd9c582008-08-14 11:37:28 +01005318 .ptrace_may_access = selinux_ptrace_may_access,
5319 .ptrace_traceme = selinux_ptrace_traceme,
Linus Torvalds1da177e2005-04-16 15:20:36 -07005320 .capget = selinux_capget,
David Howellsd84f4f92008-11-14 10:39:23 +11005321 .capset = selinux_capset,
Linus Torvalds1da177e2005-04-16 15:20:36 -07005322 .sysctl = selinux_sysctl,
5323 .capable = selinux_capable,
5324 .quotactl = selinux_quotactl,
5325 .quota_on = selinux_quota_on,
5326 .syslog = selinux_syslog,
5327 .vm_enough_memory = selinux_vm_enough_memory,
5328
5329 .netlink_send = selinux_netlink_send,
Eric Paris828dfe12008-04-17 13:17:49 -04005330 .netlink_recv = selinux_netlink_recv,
Linus Torvalds1da177e2005-04-16 15:20:36 -07005331
David Howellsa6f76f22008-11-14 10:39:24 +11005332 .bprm_set_creds = selinux_bprm_set_creds,
David Howellsa6f76f22008-11-14 10:39:24 +11005333 .bprm_committing_creds = selinux_bprm_committing_creds,
5334 .bprm_committed_creds = selinux_bprm_committed_creds,
Linus Torvalds1da177e2005-04-16 15:20:36 -07005335 .bprm_secureexec = selinux_bprm_secureexec,
5336
5337 .sb_alloc_security = selinux_sb_alloc_security,
5338 .sb_free_security = selinux_sb_free_security,
5339 .sb_copy_data = selinux_sb_copy_data,
Eric Paris828dfe12008-04-17 13:17:49 -04005340 .sb_kern_mount = selinux_sb_kern_mount,
Eric Paris2069f452008-07-04 09:47:13 +10005341 .sb_show_options = selinux_sb_show_options,
Linus Torvalds1da177e2005-04-16 15:20:36 -07005342 .sb_statfs = selinux_sb_statfs,
5343 .sb_mount = selinux_mount,
5344 .sb_umount = selinux_umount,
Eric Parisc9180a52007-11-30 13:00:35 -05005345 .sb_set_mnt_opts = selinux_set_mnt_opts,
Eric Paris828dfe12008-04-17 13:17:49 -04005346 .sb_clone_mnt_opts = selinux_sb_clone_mnt_opts,
Eric Parise0007522008-03-05 10:31:54 -05005347 .sb_parse_opts_str = selinux_parse_opts_str,
5348
Linus Torvalds1da177e2005-04-16 15:20:36 -07005349
5350 .inode_alloc_security = selinux_inode_alloc_security,
5351 .inode_free_security = selinux_inode_free_security,
Stephen Smalley5e41ff92005-09-09 13:01:35 -07005352 .inode_init_security = selinux_inode_init_security,
Linus Torvalds1da177e2005-04-16 15:20:36 -07005353 .inode_create = selinux_inode_create,
Linus Torvalds1da177e2005-04-16 15:20:36 -07005354 .inode_link = selinux_inode_link,
Linus Torvalds1da177e2005-04-16 15:20:36 -07005355 .inode_unlink = selinux_inode_unlink,
5356 .inode_symlink = selinux_inode_symlink,
Linus Torvalds1da177e2005-04-16 15:20:36 -07005357 .inode_mkdir = selinux_inode_mkdir,
Linus Torvalds1da177e2005-04-16 15:20:36 -07005358 .inode_rmdir = selinux_inode_rmdir,
5359 .inode_mknod = selinux_inode_mknod,
Linus Torvalds1da177e2005-04-16 15:20:36 -07005360 .inode_rename = selinux_inode_rename,
Linus Torvalds1da177e2005-04-16 15:20:36 -07005361 .inode_readlink = selinux_inode_readlink,
5362 .inode_follow_link = selinux_inode_follow_link,
5363 .inode_permission = selinux_inode_permission,
5364 .inode_setattr = selinux_inode_setattr,
5365 .inode_getattr = selinux_inode_getattr,
5366 .inode_setxattr = selinux_inode_setxattr,
5367 .inode_post_setxattr = selinux_inode_post_setxattr,
5368 .inode_getxattr = selinux_inode_getxattr,
5369 .inode_listxattr = selinux_inode_listxattr,
5370 .inode_removexattr = selinux_inode_removexattr,
Eric Paris828dfe12008-04-17 13:17:49 -04005371 .inode_getsecurity = selinux_inode_getsecurity,
5372 .inode_setsecurity = selinux_inode_setsecurity,
5373 .inode_listsecurity = selinux_inode_listsecurity,
Eric Parisf5269712008-05-14 11:27:45 -04005374 .inode_getsecid = selinux_inode_getsecid,
Linus Torvalds1da177e2005-04-16 15:20:36 -07005375
5376 .file_permission = selinux_file_permission,
5377 .file_alloc_security = selinux_file_alloc_security,
5378 .file_free_security = selinux_file_free_security,
5379 .file_ioctl = selinux_file_ioctl,
5380 .file_mmap = selinux_file_mmap,
5381 .file_mprotect = selinux_file_mprotect,
5382 .file_lock = selinux_file_lock,
5383 .file_fcntl = selinux_file_fcntl,
5384 .file_set_fowner = selinux_file_set_fowner,
5385 .file_send_sigiotask = selinux_file_send_sigiotask,
5386 .file_receive = selinux_file_receive,
5387
Eric Paris828dfe12008-04-17 13:17:49 -04005388 .dentry_open = selinux_dentry_open,
Yuichi Nakamura788e7dd2007-09-14 09:27:07 +09005389
Linus Torvalds1da177e2005-04-16 15:20:36 -07005390 .task_create = selinux_task_create,
David Howellsf1752ee2008-11-14 10:39:17 +11005391 .cred_free = selinux_cred_free,
David Howellsd84f4f92008-11-14 10:39:23 +11005392 .cred_prepare = selinux_cred_prepare,
David Howells3a3b7ce2008-11-14 10:39:28 +11005393 .kernel_act_as = selinux_kernel_act_as,
5394 .kernel_create_files_as = selinux_kernel_create_files_as,
Linus Torvalds1da177e2005-04-16 15:20:36 -07005395 .task_setpgid = selinux_task_setpgid,
5396 .task_getpgid = selinux_task_getpgid,
Eric Paris828dfe12008-04-17 13:17:49 -04005397 .task_getsid = selinux_task_getsid,
David Quigleyf9008e42006-06-30 01:55:46 -07005398 .task_getsecid = selinux_task_getsecid,
Linus Torvalds1da177e2005-04-16 15:20:36 -07005399 .task_setnice = selinux_task_setnice,
James Morris03e68062006-06-23 02:03:58 -07005400 .task_setioprio = selinux_task_setioprio,
David Quigleya1836a42006-06-30 01:55:49 -07005401 .task_getioprio = selinux_task_getioprio,
Linus Torvalds1da177e2005-04-16 15:20:36 -07005402 .task_setrlimit = selinux_task_setrlimit,
5403 .task_setscheduler = selinux_task_setscheduler,
5404 .task_getscheduler = selinux_task_getscheduler,
David Quigley35601542006-06-23 02:04:01 -07005405 .task_movememory = selinux_task_movememory,
Linus Torvalds1da177e2005-04-16 15:20:36 -07005406 .task_kill = selinux_task_kill,
5407 .task_wait = selinux_task_wait,
Eric Paris828dfe12008-04-17 13:17:49 -04005408 .task_to_inode = selinux_task_to_inode,
Linus Torvalds1da177e2005-04-16 15:20:36 -07005409
5410 .ipc_permission = selinux_ipc_permission,
Eric Parisf5269712008-05-14 11:27:45 -04005411 .ipc_getsecid = selinux_ipc_getsecid,
Linus Torvalds1da177e2005-04-16 15:20:36 -07005412
5413 .msg_msg_alloc_security = selinux_msg_msg_alloc_security,
5414 .msg_msg_free_security = selinux_msg_msg_free_security,
5415
5416 .msg_queue_alloc_security = selinux_msg_queue_alloc_security,
5417 .msg_queue_free_security = selinux_msg_queue_free_security,
5418 .msg_queue_associate = selinux_msg_queue_associate,
5419 .msg_queue_msgctl = selinux_msg_queue_msgctl,
5420 .msg_queue_msgsnd = selinux_msg_queue_msgsnd,
5421 .msg_queue_msgrcv = selinux_msg_queue_msgrcv,
5422
5423 .shm_alloc_security = selinux_shm_alloc_security,
5424 .shm_free_security = selinux_shm_free_security,
5425 .shm_associate = selinux_shm_associate,
5426 .shm_shmctl = selinux_shm_shmctl,
5427 .shm_shmat = selinux_shm_shmat,
5428
Eric Paris828dfe12008-04-17 13:17:49 -04005429 .sem_alloc_security = selinux_sem_alloc_security,
5430 .sem_free_security = selinux_sem_free_security,
Linus Torvalds1da177e2005-04-16 15:20:36 -07005431 .sem_associate = selinux_sem_associate,
5432 .sem_semctl = selinux_sem_semctl,
5433 .sem_semop = selinux_sem_semop,
5434
Eric Paris828dfe12008-04-17 13:17:49 -04005435 .d_instantiate = selinux_d_instantiate,
Linus Torvalds1da177e2005-04-16 15:20:36 -07005436
Eric Paris828dfe12008-04-17 13:17:49 -04005437 .getprocattr = selinux_getprocattr,
5438 .setprocattr = selinux_setprocattr,
Linus Torvalds1da177e2005-04-16 15:20:36 -07005439
Catherine Zhangdc49c1f2006-08-02 14:12:06 -07005440 .secid_to_secctx = selinux_secid_to_secctx,
David Howells63cb3442008-01-15 23:47:35 +00005441 .secctx_to_secid = selinux_secctx_to_secid,
Catherine Zhangdc49c1f2006-08-02 14:12:06 -07005442 .release_secctx = selinux_release_secctx,
5443
Eric Paris828dfe12008-04-17 13:17:49 -04005444 .unix_stream_connect = selinux_socket_unix_stream_connect,
Linus Torvalds1da177e2005-04-16 15:20:36 -07005445 .unix_may_send = selinux_socket_unix_may_send,
5446
5447 .socket_create = selinux_socket_create,
5448 .socket_post_create = selinux_socket_post_create,
5449 .socket_bind = selinux_socket_bind,
5450 .socket_connect = selinux_socket_connect,
5451 .socket_listen = selinux_socket_listen,
5452 .socket_accept = selinux_socket_accept,
5453 .socket_sendmsg = selinux_socket_sendmsg,
5454 .socket_recvmsg = selinux_socket_recvmsg,
5455 .socket_getsockname = selinux_socket_getsockname,
5456 .socket_getpeername = selinux_socket_getpeername,
5457 .socket_getsockopt = selinux_socket_getsockopt,
5458 .socket_setsockopt = selinux_socket_setsockopt,
5459 .socket_shutdown = selinux_socket_shutdown,
5460 .socket_sock_rcv_skb = selinux_socket_sock_rcv_skb,
Catherine Zhang2c7946a2006-03-20 22:41:23 -08005461 .socket_getpeersec_stream = selinux_socket_getpeersec_stream,
5462 .socket_getpeersec_dgram = selinux_socket_getpeersec_dgram,
Linus Torvalds1da177e2005-04-16 15:20:36 -07005463 .sk_alloc_security = selinux_sk_alloc_security,
5464 .sk_free_security = selinux_sk_free_security,
Venkat Yekkirala892c1412006-08-04 23:08:56 -07005465 .sk_clone_security = selinux_sk_clone_security,
Eric Paris828dfe12008-04-17 13:17:49 -04005466 .sk_getsecid = selinux_sk_getsecid,
Venkat Yekkirala4237c752006-07-24 23:32:50 -07005467 .sock_graft = selinux_sock_graft,
5468 .inet_conn_request = selinux_inet_conn_request,
5469 .inet_csk_clone = selinux_inet_csk_clone,
Venkat Yekkirala6b877692006-11-08 17:04:09 -06005470 .inet_conn_established = selinux_inet_conn_established,
Venkat Yekkirala4237c752006-07-24 23:32:50 -07005471 .req_classify_flow = selinux_req_classify_flow,
Trent Jaegerd28d1e02005-12-13 23:12:40 -08005472
5473#ifdef CONFIG_SECURITY_NETWORK_XFRM
5474 .xfrm_policy_alloc_security = selinux_xfrm_policy_alloc,
5475 .xfrm_policy_clone_security = selinux_xfrm_policy_clone,
5476 .xfrm_policy_free_security = selinux_xfrm_policy_free,
Catherine Zhangc8c05a82006-06-08 23:39:49 -07005477 .xfrm_policy_delete_security = selinux_xfrm_policy_delete,
Trent Jaegerd28d1e02005-12-13 23:12:40 -08005478 .xfrm_state_alloc_security = selinux_xfrm_state_alloc,
5479 .xfrm_state_free_security = selinux_xfrm_state_free,
Catherine Zhangc8c05a82006-06-08 23:39:49 -07005480 .xfrm_state_delete_security = selinux_xfrm_state_delete,
Eric Paris828dfe12008-04-17 13:17:49 -04005481 .xfrm_policy_lookup = selinux_xfrm_policy_lookup,
Venkat Yekkiralae0d1caa2006-07-24 23:29:07 -07005482 .xfrm_state_pol_flow_match = selinux_xfrm_state_pol_flow_match,
Venkat Yekkiralae0d1caa2006-07-24 23:29:07 -07005483 .xfrm_decode_session = selinux_xfrm_decode_session,
Linus Torvalds1da177e2005-04-16 15:20:36 -07005484#endif
Michael LeMayd7200242006-06-22 14:47:17 -07005485
5486#ifdef CONFIG_KEYS
Eric Paris828dfe12008-04-17 13:17:49 -04005487 .key_alloc = selinux_key_alloc,
5488 .key_free = selinux_key_free,
5489 .key_permission = selinux_key_permission,
David Howells70a5bb72008-04-29 01:01:26 -07005490 .key_getsecurity = selinux_key_getsecurity,
Michael LeMayd7200242006-06-22 14:47:17 -07005491#endif
Ahmed S. Darwish9d57a7f2008-03-01 22:03:14 +02005492
5493#ifdef CONFIG_AUDIT
5494 .audit_rule_init = selinux_audit_rule_init,
5495 .audit_rule_known = selinux_audit_rule_known,
5496 .audit_rule_match = selinux_audit_rule_match,
5497 .audit_rule_free = selinux_audit_rule_free,
5498#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07005499};
5500
5501static __init int selinux_init(void)
5502{
Ahmed S. Darwish076c54c2008-03-06 18:09:10 +02005503 if (!security_module_enable(&selinux_ops)) {
5504 selinux_enabled = 0;
5505 return 0;
5506 }
5507
Linus Torvalds1da177e2005-04-16 15:20:36 -07005508 if (!selinux_enabled) {
5509 printk(KERN_INFO "SELinux: Disabled at boot.\n");
5510 return 0;
5511 }
5512
5513 printk(KERN_INFO "SELinux: Initializing.\n");
5514
5515 /* Set the security state for the initial task. */
David Howellsd84f4f92008-11-14 10:39:23 +11005516 cred_init_security();
Linus Torvalds1da177e2005-04-16 15:20:36 -07005517
James Morris7cae7e22006-03-22 00:09:22 -08005518 sel_inode_cache = kmem_cache_create("selinux_inode_security",
5519 sizeof(struct inode_security_struct),
Paul Mundt20c2df82007-07-20 10:11:58 +09005520 0, SLAB_PANIC, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005521 avc_init();
5522
James Morris6f0f0fd2008-07-10 17:02:07 +09005523 secondary_ops = security_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005524 if (!secondary_ops)
Eric Paris828dfe12008-04-17 13:17:49 -04005525 panic("SELinux: No initial security operations\n");
5526 if (register_security(&selinux_ops))
Linus Torvalds1da177e2005-04-16 15:20:36 -07005527 panic("SELinux: Unable to register with kernel.\n");
5528
Eric Paris828dfe12008-04-17 13:17:49 -04005529 if (selinux_enforcing)
Eric Parisfadcdb42007-02-22 18:11:31 -05005530 printk(KERN_DEBUG "SELinux: Starting in enforcing mode\n");
Eric Paris828dfe12008-04-17 13:17:49 -04005531 else
Eric Parisfadcdb42007-02-22 18:11:31 -05005532 printk(KERN_DEBUG "SELinux: Starting in permissive mode\n");
Michael LeMayd7200242006-06-22 14:47:17 -07005533
Linus Torvalds1da177e2005-04-16 15:20:36 -07005534 return 0;
5535}
5536
5537void selinux_complete_init(void)
5538{
Eric Parisfadcdb42007-02-22 18:11:31 -05005539 printk(KERN_DEBUG "SELinux: Completing initialization.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07005540
5541 /* Set up any superblocks initialized prior to the policy load. */
Eric Parisfadcdb42007-02-22 18:11:31 -05005542 printk(KERN_DEBUG "SELinux: Setting up existing superblocks.\n");
Stephen Smalleyba0c19e2006-06-04 02:51:30 -07005543 spin_lock(&sb_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005544 spin_lock(&sb_security_lock);
5545next_sb:
5546 if (!list_empty(&superblock_security_head)) {
5547 struct superblock_security_struct *sbsec =
5548 list_entry(superblock_security_head.next,
Eric Paris828dfe12008-04-17 13:17:49 -04005549 struct superblock_security_struct,
5550 list);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005551 struct super_block *sb = sbsec->sb;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005552 sb->s_count++;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005553 spin_unlock(&sb_security_lock);
Stephen Smalleyba0c19e2006-06-04 02:51:30 -07005554 spin_unlock(&sb_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005555 down_read(&sb->s_umount);
5556 if (sb->s_root)
5557 superblock_doinit(sb, NULL);
5558 drop_super(sb);
Stephen Smalleyba0c19e2006-06-04 02:51:30 -07005559 spin_lock(&sb_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005560 spin_lock(&sb_security_lock);
5561 list_del_init(&sbsec->list);
5562 goto next_sb;
5563 }
5564 spin_unlock(&sb_security_lock);
Stephen Smalleyba0c19e2006-06-04 02:51:30 -07005565 spin_unlock(&sb_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005566}
5567
5568/* SELinux requires early initialization in order to label
5569 all processes and objects when they are created. */
5570security_initcall(selinux_init);
5571
Stephen Smalleyc2b507f2006-02-04 23:27:50 -08005572#if defined(CONFIG_NETFILTER)
Linus Torvalds1da177e2005-04-16 15:20:36 -07005573
Paul Mooreeffad8d2008-01-29 08:49:27 -05005574static struct nf_hook_ops selinux_ipv4_ops[] = {
5575 {
5576 .hook = selinux_ipv4_postroute,
5577 .owner = THIS_MODULE,
5578 .pf = PF_INET,
5579 .hooknum = NF_INET_POST_ROUTING,
5580 .priority = NF_IP_PRI_SELINUX_LAST,
5581 },
5582 {
5583 .hook = selinux_ipv4_forward,
5584 .owner = THIS_MODULE,
5585 .pf = PF_INET,
5586 .hooknum = NF_INET_FORWARD,
5587 .priority = NF_IP_PRI_SELINUX_FIRST,
Paul Moore948bf852008-10-10 10:16:32 -04005588 },
5589 {
5590 .hook = selinux_ipv4_output,
5591 .owner = THIS_MODULE,
5592 .pf = PF_INET,
5593 .hooknum = NF_INET_LOCAL_OUT,
5594 .priority = NF_IP_PRI_SELINUX_FIRST,
Paul Mooreeffad8d2008-01-29 08:49:27 -05005595 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07005596};
5597
5598#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
5599
Paul Mooreeffad8d2008-01-29 08:49:27 -05005600static struct nf_hook_ops selinux_ipv6_ops[] = {
5601 {
5602 .hook = selinux_ipv6_postroute,
5603 .owner = THIS_MODULE,
5604 .pf = PF_INET6,
5605 .hooknum = NF_INET_POST_ROUTING,
5606 .priority = NF_IP6_PRI_SELINUX_LAST,
5607 },
5608 {
5609 .hook = selinux_ipv6_forward,
5610 .owner = THIS_MODULE,
5611 .pf = PF_INET6,
5612 .hooknum = NF_INET_FORWARD,
5613 .priority = NF_IP6_PRI_SELINUX_FIRST,
5614 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07005615};
5616
5617#endif /* IPV6 */
5618
5619static int __init selinux_nf_ip_init(void)
5620{
5621 int err = 0;
5622
5623 if (!selinux_enabled)
5624 goto out;
Eric Parisfadcdb42007-02-22 18:11:31 -05005625
5626 printk(KERN_DEBUG "SELinux: Registering netfilter hooks\n");
5627
Alexey Dobriyan6c5a9d22008-07-26 17:48:15 -07005628 err = nf_register_hooks(selinux_ipv4_ops, ARRAY_SIZE(selinux_ipv4_ops));
5629 if (err)
5630 panic("SELinux: nf_register_hooks for IPv4: error %d\n", err);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005631
5632#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
Alexey Dobriyan6c5a9d22008-07-26 17:48:15 -07005633 err = nf_register_hooks(selinux_ipv6_ops, ARRAY_SIZE(selinux_ipv6_ops));
5634 if (err)
5635 panic("SELinux: nf_register_hooks for IPv6: error %d\n", err);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005636#endif /* IPV6 */
Trent Jaegerd28d1e02005-12-13 23:12:40 -08005637
Linus Torvalds1da177e2005-04-16 15:20:36 -07005638out:
5639 return err;
5640}
5641
5642__initcall(selinux_nf_ip_init);
5643
5644#ifdef CONFIG_SECURITY_SELINUX_DISABLE
5645static void selinux_nf_ip_exit(void)
5646{
Eric Parisfadcdb42007-02-22 18:11:31 -05005647 printk(KERN_DEBUG "SELinux: Unregistering netfilter hooks\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07005648
Alexey Dobriyan6c5a9d22008-07-26 17:48:15 -07005649 nf_unregister_hooks(selinux_ipv4_ops, ARRAY_SIZE(selinux_ipv4_ops));
Linus Torvalds1da177e2005-04-16 15:20:36 -07005650#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
Alexey Dobriyan6c5a9d22008-07-26 17:48:15 -07005651 nf_unregister_hooks(selinux_ipv6_ops, ARRAY_SIZE(selinux_ipv6_ops));
Linus Torvalds1da177e2005-04-16 15:20:36 -07005652#endif /* IPV6 */
5653}
5654#endif
5655
Stephen Smalleyc2b507f2006-02-04 23:27:50 -08005656#else /* CONFIG_NETFILTER */
Linus Torvalds1da177e2005-04-16 15:20:36 -07005657
5658#ifdef CONFIG_SECURITY_SELINUX_DISABLE
5659#define selinux_nf_ip_exit()
5660#endif
5661
Stephen Smalleyc2b507f2006-02-04 23:27:50 -08005662#endif /* CONFIG_NETFILTER */
Linus Torvalds1da177e2005-04-16 15:20:36 -07005663
5664#ifdef CONFIG_SECURITY_SELINUX_DISABLE
Eric Paris828dfe12008-04-17 13:17:49 -04005665static int selinux_disabled;
5666
Linus Torvalds1da177e2005-04-16 15:20:36 -07005667int selinux_disable(void)
5668{
5669 extern void exit_sel_fs(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -07005670
5671 if (ss_initialized) {
5672 /* Not permitted after initial policy load. */
5673 return -EINVAL;
5674 }
5675
5676 if (selinux_disabled) {
5677 /* Only do this once. */
5678 return -EINVAL;
5679 }
5680
5681 printk(KERN_INFO "SELinux: Disabled at runtime.\n");
5682
5683 selinux_disabled = 1;
Stephen Smalley30d55282006-05-03 10:52:36 -04005684 selinux_enabled = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07005685
5686 /* Reset security_ops to the secondary module, dummy or capability. */
5687 security_ops = secondary_ops;
5688
5689 /* Unregister netfilter hooks. */
5690 selinux_nf_ip_exit();
5691
5692 /* Unregister selinuxfs. */
5693 exit_sel_fs();
5694
5695 return 0;
5696}
5697#endif