Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * NSA Security-Enhanced Linux (SELinux) security module | |
3 | * | |
4 | * This file contains the SELinux hook function implementations. | |
5 | * | |
6 | * Authors: Stephen Smalley, <sds@epoch.ncsc.mil> | |
828dfe1d EP |
7 | * Chris Vance, <cvance@nai.com> |
8 | * Wayne Salamon, <wsalamon@nai.com> | |
9 | * James Morris <jmorris@redhat.com> | |
1da177e4 LT |
10 | * |
11 | * Copyright (C) 2001,2002 Networks Associates Technology, Inc. | |
2069f457 EP |
12 | * Copyright (C) 2003-2008 Red Hat, Inc., James Morris <jmorris@redhat.com> |
13 | * Eric Paris <eparis@redhat.com> | |
1da177e4 | 14 | * Copyright (C) 2004-2005 Trusted Computer Solutions, Inc. |
828dfe1d | 15 | * <dgoeddel@trustedcs.com> |
effad8df | 16 | * Copyright (C) 2006, 2007 Hewlett-Packard Development Company, L.P. |
828dfe1d | 17 | * Paul Moore <paul.moore@hp.com> |
788e7dd4 | 18 | * Copyright (C) 2007 Hitachi Software Engineering Co., Ltd. |
828dfe1d | 19 | * Yuichi Nakamura <ynakam@hitachisoft.jp> |
1da177e4 LT |
20 | * |
21 | * This program is free software; you can redistribute it and/or modify | |
22 | * it under the terms of the GNU General Public License version 2, | |
828dfe1d | 23 | * as published by the Free Software Foundation. |
1da177e4 LT |
24 | */ |
25 | ||
1da177e4 LT |
26 | #include <linux/init.h> |
27 | #include <linux/kernel.h> | |
0d094efe | 28 | #include <linux/tracehook.h> |
1da177e4 LT |
29 | #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> | |
1da177e4 LT |
40 | #include <linux/spinlock.h> |
41 | #include <linux/syscalls.h> | |
42 | #include <linux/file.h> | |
9f3acc31 | 43 | #include <linux/fdtable.h> |
1da177e4 LT |
44 | #include <linux/namei.h> |
45 | #include <linux/mount.h> | |
1da177e4 | 46 | #include <linux/proc_fs.h> |
1da177e4 LT |
47 | #include <linux/netfilter_ipv4.h> |
48 | #include <linux/netfilter_ipv6.h> | |
49 | #include <linux/tty.h> | |
50 | #include <net/icmp.h> | |
227b60f5 | 51 | #include <net/ip.h> /* for local_port_range[] */ |
1da177e4 | 52 | #include <net/tcp.h> /* struct or_callable used in sock_rcv_skb */ |
220deb96 | 53 | #include <net/net_namespace.h> |
d621d35e | 54 | #include <net/netlabel.h> |
f5269710 | 55 | #include <linux/uaccess.h> |
1da177e4 | 56 | #include <asm/ioctls.h> |
d621d35e | 57 | #include <asm/atomic.h> |
1da177e4 LT |
58 | #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> | |
2ee92d46 | 64 | #include <linux/dccp.h> |
1da177e4 LT |
65 | #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> | |
6931dfc9 | 75 | #include <linux/string.h> |
877ce7c1 | 76 | #include <linux/selinux.h> |
23970741 | 77 | #include <linux/mutex.h> |
f06febc9 | 78 | #include <linux/posix-timers.h> |
1da177e4 LT |
79 | |
80 | #include "avc.h" | |
81 | #include "objsec.h" | |
82 | #include "netif.h" | |
224dfbd8 | 83 | #include "netnode.h" |
3e112172 | 84 | #include "netport.h" |
d28d1e08 | 85 | #include "xfrm.h" |
c60475bf | 86 | #include "netlabel.h" |
9d57a7f9 | 87 | #include "audit.h" |
1da177e4 LT |
88 | |
89 | #define XATTR_SELINUX_SUFFIX "selinux" | |
90 | #define XATTR_NAME_SELINUX XATTR_SECURITY_PREFIX XATTR_SELINUX_SUFFIX | |
91 | ||
c9180a57 EP |
92 | #define NUM_SEL_MNT_OPTS 4 |
93 | ||
1da177e4 LT |
94 | extern unsigned int policydb_loaded_version; |
95 | extern int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm); | |
4e5ab4cb | 96 | extern int selinux_compat_net; |
20510f2f | 97 | extern struct security_operations *security_ops; |
1da177e4 | 98 | |
d621d35e PM |
99 | /* SECMARK reference count */ |
100 | atomic_t selinux_secmark_refcount = ATOMIC_INIT(0); | |
101 | ||
1da177e4 | 102 | #ifdef CONFIG_SECURITY_SELINUX_DEVELOP |
828dfe1d | 103 | int selinux_enforcing; |
1da177e4 LT |
104 | |
105 | static int __init enforcing_setup(char *str) | |
106 | { | |
f5269710 EP |
107 | unsigned long enforcing; |
108 | if (!strict_strtoul(str, 0, &enforcing)) | |
109 | selinux_enforcing = enforcing ? 1 : 0; | |
1da177e4 LT |
110 | return 1; |
111 | } | |
112 | __setup("enforcing=", enforcing_setup); | |
113 | #endif | |
114 | ||
115 | #ifdef CONFIG_SECURITY_SELINUX_BOOTPARAM | |
116 | int selinux_enabled = CONFIG_SECURITY_SELINUX_BOOTPARAM_VALUE; | |
117 | ||
118 | static int __init selinux_enabled_setup(char *str) | |
119 | { | |
f5269710 EP |
120 | unsigned long enabled; |
121 | if (!strict_strtoul(str, 0, &enabled)) | |
122 | selinux_enabled = enabled ? 1 : 0; | |
1da177e4 LT |
123 | return 1; |
124 | } | |
125 | __setup("selinux=", selinux_enabled_setup); | |
30d55280 SS |
126 | #else |
127 | int selinux_enabled = 1; | |
1da177e4 LT |
128 | #endif |
129 | ||
1da177e4 | 130 | |
6f0f0fd4 JM |
131 | /* |
132 | * Minimal support for a secondary security module, | |
133 | * just to allow the use of the capability module. | |
134 | */ | |
828dfe1d | 135 | static struct security_operations *secondary_ops; |
1da177e4 LT |
136 | |
137 | /* Lists of inode and superblock security structures initialized | |
138 | before the policy was loaded. */ | |
139 | static LIST_HEAD(superblock_security_head); | |
140 | static DEFINE_SPINLOCK(sb_security_lock); | |
141 | ||
e18b890b | 142 | static struct kmem_cache *sel_inode_cache; |
7cae7e26 | 143 | |
d621d35e PM |
144 | /** |
145 | * selinux_secmark_enabled - Check to see if SECMARK is currently enabled | |
146 | * | |
147 | * Description: | |
148 | * This function checks the SECMARK reference counter to see if any SECMARK | |
149 | * targets are currently configured, if the reference counter is greater than | |
150 | * zero SECMARK is considered to be enabled. Returns true (1) if SECMARK is | |
151 | * enabled, false (0) if SECMARK is disabled. | |
152 | * | |
153 | */ | |
154 | static int selinux_secmark_enabled(void) | |
155 | { | |
156 | return (atomic_read(&selinux_secmark_refcount) > 0); | |
157 | } | |
158 | ||
1da177e4 LT |
159 | /* Allocate and free functions for each kind of security blob. */ |
160 | ||
f1752eec | 161 | static int cred_alloc_security(struct cred *cred) |
1da177e4 LT |
162 | { |
163 | struct task_security_struct *tsec; | |
164 | ||
89d155ef | 165 | tsec = kzalloc(sizeof(struct task_security_struct), GFP_KERNEL); |
1da177e4 LT |
166 | if (!tsec) |
167 | return -ENOMEM; | |
168 | ||
0356357c | 169 | tsec->osid = tsec->sid = SECINITSID_UNLABELED; |
f1752eec | 170 | cred->security = tsec; |
1da177e4 LT |
171 | |
172 | return 0; | |
173 | } | |
174 | ||
1da177e4 LT |
175 | static int inode_alloc_security(struct inode *inode) |
176 | { | |
b6dff3ec | 177 | struct task_security_struct *tsec = current->cred->security; |
1da177e4 LT |
178 | struct inode_security_struct *isec; |
179 | ||
a02fe132 | 180 | isec = kmem_cache_zalloc(sel_inode_cache, GFP_NOFS); |
1da177e4 LT |
181 | if (!isec) |
182 | return -ENOMEM; | |
183 | ||
23970741 | 184 | mutex_init(&isec->lock); |
1da177e4 | 185 | INIT_LIST_HEAD(&isec->list); |
1da177e4 LT |
186 | isec->inode = inode; |
187 | isec->sid = SECINITSID_UNLABELED; | |
188 | isec->sclass = SECCLASS_FILE; | |
9ac49d22 | 189 | isec->task_sid = tsec->sid; |
1da177e4 LT |
190 | inode->i_security = isec; |
191 | ||
192 | return 0; | |
193 | } | |
194 | ||
195 | static void inode_free_security(struct inode *inode) | |
196 | { | |
197 | struct inode_security_struct *isec = inode->i_security; | |
198 | struct superblock_security_struct *sbsec = inode->i_sb->s_security; | |
199 | ||
1da177e4 LT |
200 | spin_lock(&sbsec->isec_lock); |
201 | if (!list_empty(&isec->list)) | |
202 | list_del_init(&isec->list); | |
203 | spin_unlock(&sbsec->isec_lock); | |
204 | ||
205 | inode->i_security = NULL; | |
7cae7e26 | 206 | kmem_cache_free(sel_inode_cache, isec); |
1da177e4 LT |
207 | } |
208 | ||
209 | static int file_alloc_security(struct file *file) | |
210 | { | |
b6dff3ec | 211 | struct task_security_struct *tsec = current->cred->security; |
1da177e4 LT |
212 | struct file_security_struct *fsec; |
213 | ||
26d2a4be | 214 | fsec = kzalloc(sizeof(struct file_security_struct), GFP_KERNEL); |
1da177e4 LT |
215 | if (!fsec) |
216 | return -ENOMEM; | |
217 | ||
9ac49d22 SS |
218 | fsec->sid = tsec->sid; |
219 | fsec->fown_sid = tsec->sid; | |
1da177e4 LT |
220 | file->f_security = fsec; |
221 | ||
222 | return 0; | |
223 | } | |
224 | ||
225 | static void file_free_security(struct file *file) | |
226 | { | |
227 | struct file_security_struct *fsec = file->f_security; | |
1da177e4 LT |
228 | file->f_security = NULL; |
229 | kfree(fsec); | |
230 | } | |
231 | ||
232 | static int superblock_alloc_security(struct super_block *sb) | |
233 | { | |
234 | struct superblock_security_struct *sbsec; | |
235 | ||
89d155ef | 236 | sbsec = kzalloc(sizeof(struct superblock_security_struct), GFP_KERNEL); |
1da177e4 LT |
237 | if (!sbsec) |
238 | return -ENOMEM; | |
239 | ||
bc7e982b | 240 | mutex_init(&sbsec->lock); |
1da177e4 LT |
241 | INIT_LIST_HEAD(&sbsec->list); |
242 | INIT_LIST_HEAD(&sbsec->isec_head); | |
243 | spin_lock_init(&sbsec->isec_lock); | |
1da177e4 LT |
244 | sbsec->sb = sb; |
245 | sbsec->sid = SECINITSID_UNLABELED; | |
246 | sbsec->def_sid = SECINITSID_FILE; | |
c312feb2 | 247 | sbsec->mntpoint_sid = SECINITSID_UNLABELED; |
1da177e4 LT |
248 | sb->s_security = sbsec; |
249 | ||
250 | return 0; | |
251 | } | |
252 | ||
253 | static void superblock_free_security(struct super_block *sb) | |
254 | { | |
255 | struct superblock_security_struct *sbsec = sb->s_security; | |
256 | ||
1da177e4 LT |
257 | spin_lock(&sb_security_lock); |
258 | if (!list_empty(&sbsec->list)) | |
259 | list_del_init(&sbsec->list); | |
260 | spin_unlock(&sb_security_lock); | |
261 | ||
262 | sb->s_security = NULL; | |
263 | kfree(sbsec); | |
264 | } | |
265 | ||
7d877f3b | 266 | static int sk_alloc_security(struct sock *sk, int family, gfp_t priority) |
1da177e4 LT |
267 | { |
268 | struct sk_security_struct *ssec; | |
269 | ||
89d155ef | 270 | ssec = kzalloc(sizeof(*ssec), priority); |
1da177e4 LT |
271 | if (!ssec) |
272 | return -ENOMEM; | |
273 | ||
1da177e4 | 274 | ssec->peer_sid = SECINITSID_UNLABELED; |
892c141e | 275 | ssec->sid = SECINITSID_UNLABELED; |
1da177e4 LT |
276 | sk->sk_security = ssec; |
277 | ||
f74af6e8 | 278 | selinux_netlbl_sk_security_reset(ssec, family); |
99f59ed0 | 279 | |
1da177e4 LT |
280 | return 0; |
281 | } | |
282 | ||
283 | static void sk_free_security(struct sock *sk) | |
284 | { | |
285 | struct sk_security_struct *ssec = sk->sk_security; | |
286 | ||
1da177e4 | 287 | sk->sk_security = NULL; |
6c5b3fc0 | 288 | selinux_netlbl_sk_security_free(ssec); |
1da177e4 LT |
289 | kfree(ssec); |
290 | } | |
1da177e4 LT |
291 | |
292 | /* The security server must be initialized before | |
293 | any labeling or access decisions can be provided. */ | |
294 | extern int ss_initialized; | |
295 | ||
296 | /* The file system's label must be initialized prior to use. */ | |
297 | ||
298 | static char *labeling_behaviors[6] = { | |
299 | "uses xattr", | |
300 | "uses transition SIDs", | |
301 | "uses task SIDs", | |
302 | "uses genfs_contexts", | |
303 | "not configured for labeling", | |
304 | "uses mountpoint labeling", | |
305 | }; | |
306 | ||
307 | static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dentry); | |
308 | ||
309 | static inline int inode_doinit(struct inode *inode) | |
310 | { | |
311 | return inode_doinit_with_dentry(inode, NULL); | |
312 | } | |
313 | ||
314 | enum { | |
31e87930 | 315 | Opt_error = -1, |
1da177e4 LT |
316 | Opt_context = 1, |
317 | Opt_fscontext = 2, | |
c9180a57 EP |
318 | Opt_defcontext = 3, |
319 | Opt_rootcontext = 4, | |
1da177e4 LT |
320 | }; |
321 | ||
a447c093 | 322 | static const match_table_t tokens = { |
832cbd9a EP |
323 | {Opt_context, CONTEXT_STR "%s"}, |
324 | {Opt_fscontext, FSCONTEXT_STR "%s"}, | |
325 | {Opt_defcontext, DEFCONTEXT_STR "%s"}, | |
326 | {Opt_rootcontext, ROOTCONTEXT_STR "%s"}, | |
31e87930 | 327 | {Opt_error, NULL}, |
1da177e4 LT |
328 | }; |
329 | ||
330 | #define SEL_MOUNT_FAIL_MSG "SELinux: duplicate or incompatible mount options\n" | |
331 | ||
c312feb2 EP |
332 | static int may_context_mount_sb_relabel(u32 sid, |
333 | struct superblock_security_struct *sbsec, | |
334 | struct task_security_struct *tsec) | |
335 | { | |
336 | int rc; | |
337 | ||
338 | rc = avc_has_perm(tsec->sid, sbsec->sid, SECCLASS_FILESYSTEM, | |
339 | FILESYSTEM__RELABELFROM, NULL); | |
340 | if (rc) | |
341 | return rc; | |
342 | ||
343 | rc = avc_has_perm(tsec->sid, sid, SECCLASS_FILESYSTEM, | |
344 | FILESYSTEM__RELABELTO, NULL); | |
345 | return rc; | |
346 | } | |
347 | ||
0808925e EP |
348 | static int may_context_mount_inode_relabel(u32 sid, |
349 | struct superblock_security_struct *sbsec, | |
350 | struct task_security_struct *tsec) | |
351 | { | |
352 | int rc; | |
353 | rc = avc_has_perm(tsec->sid, sbsec->sid, SECCLASS_FILESYSTEM, | |
354 | FILESYSTEM__RELABELFROM, NULL); | |
355 | if (rc) | |
356 | return rc; | |
357 | ||
358 | rc = avc_has_perm(sid, sbsec->sid, SECCLASS_FILESYSTEM, | |
359 | FILESYSTEM__ASSOCIATE, NULL); | |
360 | return rc; | |
361 | } | |
362 | ||
c9180a57 | 363 | static int sb_finish_set_opts(struct super_block *sb) |
1da177e4 | 364 | { |
1da177e4 | 365 | struct superblock_security_struct *sbsec = sb->s_security; |
c9180a57 EP |
366 | struct dentry *root = sb->s_root; |
367 | struct inode *root_inode = root->d_inode; | |
368 | int rc = 0; | |
1da177e4 | 369 | |
c9180a57 EP |
370 | if (sbsec->behavior == SECURITY_FS_USE_XATTR) { |
371 | /* Make sure that the xattr handler exists and that no | |
372 | error other than -ENODATA is returned by getxattr on | |
373 | the root directory. -ENODATA is ok, as this may be | |
374 | the first boot of the SELinux kernel before we have | |
375 | assigned xattr values to the filesystem. */ | |
376 | if (!root_inode->i_op->getxattr) { | |
377 | printk(KERN_WARNING "SELinux: (dev %s, type %s) has no " | |
378 | "xattr support\n", sb->s_id, sb->s_type->name); | |
379 | rc = -EOPNOTSUPP; | |
380 | goto out; | |
381 | } | |
382 | rc = root_inode->i_op->getxattr(root, XATTR_NAME_SELINUX, NULL, 0); | |
383 | if (rc < 0 && rc != -ENODATA) { | |
384 | if (rc == -EOPNOTSUPP) | |
385 | printk(KERN_WARNING "SELinux: (dev %s, type " | |
386 | "%s) has no security xattr handler\n", | |
387 | sb->s_id, sb->s_type->name); | |
388 | else | |
389 | printk(KERN_WARNING "SELinux: (dev %s, type " | |
390 | "%s) getxattr errno %d\n", sb->s_id, | |
391 | sb->s_type->name, -rc); | |
392 | goto out; | |
393 | } | |
394 | } | |
1da177e4 | 395 | |
c9180a57 | 396 | sbsec->initialized = 1; |
1da177e4 | 397 | |
c9180a57 EP |
398 | if (sbsec->behavior > ARRAY_SIZE(labeling_behaviors)) |
399 | printk(KERN_ERR "SELinux: initialized (dev %s, type %s), unknown behavior\n", | |
400 | sb->s_id, sb->s_type->name); | |
401 | else | |
402 | printk(KERN_DEBUG "SELinux: initialized (dev %s, type %s), %s\n", | |
403 | sb->s_id, sb->s_type->name, | |
404 | labeling_behaviors[sbsec->behavior-1]); | |
1da177e4 | 405 | |
c9180a57 EP |
406 | /* Initialize the root inode. */ |
407 | rc = inode_doinit_with_dentry(root_inode, root); | |
1da177e4 | 408 | |
c9180a57 EP |
409 | /* Initialize any other inodes associated with the superblock, e.g. |
410 | inodes created prior to initial policy load or inodes created | |
411 | during get_sb by a pseudo filesystem that directly | |
412 | populates itself. */ | |
413 | spin_lock(&sbsec->isec_lock); | |
414 | next_inode: | |
415 | if (!list_empty(&sbsec->isec_head)) { | |
416 | struct inode_security_struct *isec = | |
417 | list_entry(sbsec->isec_head.next, | |
418 | struct inode_security_struct, list); | |
419 | struct inode *inode = isec->inode; | |
420 | spin_unlock(&sbsec->isec_lock); | |
421 | inode = igrab(inode); | |
422 | if (inode) { | |
423 | if (!IS_PRIVATE(inode)) | |
424 | inode_doinit(inode); | |
425 | iput(inode); | |
426 | } | |
427 | spin_lock(&sbsec->isec_lock); | |
428 | list_del_init(&isec->list); | |
429 | goto next_inode; | |
430 | } | |
431 | spin_unlock(&sbsec->isec_lock); | |
432 | out: | |
433 | return rc; | |
434 | } | |
1da177e4 | 435 | |
c9180a57 EP |
436 | /* |
437 | * This function should allow an FS to ask what it's mount security | |
438 | * options were so it can use those later for submounts, displaying | |
439 | * mount options, or whatever. | |
440 | */ | |
441 | static int selinux_get_mnt_opts(const struct super_block *sb, | |
e0007529 | 442 | struct security_mnt_opts *opts) |
c9180a57 EP |
443 | { |
444 | int rc = 0, i; | |
445 | struct superblock_security_struct *sbsec = sb->s_security; | |
446 | char *context = NULL; | |
447 | u32 len; | |
448 | char tmp; | |
1da177e4 | 449 | |
e0007529 | 450 | security_init_mnt_opts(opts); |
1da177e4 | 451 | |
c9180a57 EP |
452 | if (!sbsec->initialized) |
453 | return -EINVAL; | |
1da177e4 | 454 | |
c9180a57 EP |
455 | if (!ss_initialized) |
456 | return -EINVAL; | |
1da177e4 | 457 | |
c9180a57 EP |
458 | /* |
459 | * if we ever use sbsec flags for anything other than tracking mount | |
460 | * settings this is going to need a mask | |
461 | */ | |
462 | tmp = sbsec->flags; | |
463 | /* count the number of mount options for this sb */ | |
464 | for (i = 0; i < 8; i++) { | |
465 | if (tmp & 0x01) | |
e0007529 | 466 | opts->num_mnt_opts++; |
c9180a57 EP |
467 | tmp >>= 1; |
468 | } | |
1da177e4 | 469 | |
e0007529 EP |
470 | opts->mnt_opts = kcalloc(opts->num_mnt_opts, sizeof(char *), GFP_ATOMIC); |
471 | if (!opts->mnt_opts) { | |
c9180a57 EP |
472 | rc = -ENOMEM; |
473 | goto out_free; | |
474 | } | |
1da177e4 | 475 | |
e0007529 EP |
476 | opts->mnt_opts_flags = kcalloc(opts->num_mnt_opts, sizeof(int), GFP_ATOMIC); |
477 | if (!opts->mnt_opts_flags) { | |
c9180a57 EP |
478 | rc = -ENOMEM; |
479 | goto out_free; | |
480 | } | |
1da177e4 | 481 | |
c9180a57 EP |
482 | i = 0; |
483 | if (sbsec->flags & FSCONTEXT_MNT) { | |
484 | rc = security_sid_to_context(sbsec->sid, &context, &len); | |
485 | if (rc) | |
486 | goto out_free; | |
e0007529 EP |
487 | opts->mnt_opts[i] = context; |
488 | opts->mnt_opts_flags[i++] = FSCONTEXT_MNT; | |
c9180a57 EP |
489 | } |
490 | if (sbsec->flags & CONTEXT_MNT) { | |
491 | rc = security_sid_to_context(sbsec->mntpoint_sid, &context, &len); | |
492 | if (rc) | |
493 | goto out_free; | |
e0007529 EP |
494 | opts->mnt_opts[i] = context; |
495 | opts->mnt_opts_flags[i++] = CONTEXT_MNT; | |
c9180a57 EP |
496 | } |
497 | if (sbsec->flags & DEFCONTEXT_MNT) { | |
498 | rc = security_sid_to_context(sbsec->def_sid, &context, &len); | |
499 | if (rc) | |
500 | goto out_free; | |
e0007529 EP |
501 | opts->mnt_opts[i] = context; |
502 | opts->mnt_opts_flags[i++] = DEFCONTEXT_MNT; | |
c9180a57 EP |
503 | } |
504 | if (sbsec->flags & ROOTCONTEXT_MNT) { | |
505 | struct inode *root = sbsec->sb->s_root->d_inode; | |
506 | struct inode_security_struct *isec = root->i_security; | |
0808925e | 507 | |
c9180a57 EP |
508 | rc = security_sid_to_context(isec->sid, &context, &len); |
509 | if (rc) | |
510 | goto out_free; | |
e0007529 EP |
511 | opts->mnt_opts[i] = context; |
512 | opts->mnt_opts_flags[i++] = ROOTCONTEXT_MNT; | |
c9180a57 | 513 | } |
1da177e4 | 514 | |
e0007529 | 515 | BUG_ON(i != opts->num_mnt_opts); |
1da177e4 | 516 | |
c9180a57 EP |
517 | return 0; |
518 | ||
519 | out_free: | |
e0007529 | 520 | security_free_mnt_opts(opts); |
c9180a57 EP |
521 | return rc; |
522 | } | |
1da177e4 | 523 | |
c9180a57 EP |
524 | static int bad_option(struct superblock_security_struct *sbsec, char flag, |
525 | u32 old_sid, u32 new_sid) | |
526 | { | |
527 | /* check if the old mount command had the same options */ | |
528 | if (sbsec->initialized) | |
529 | if (!(sbsec->flags & flag) || | |
530 | (old_sid != new_sid)) | |
531 | return 1; | |
532 | ||
533 | /* check if we were passed the same options twice, | |
534 | * aka someone passed context=a,context=b | |
535 | */ | |
536 | if (!sbsec->initialized) | |
537 | if (sbsec->flags & flag) | |
538 | return 1; | |
539 | return 0; | |
540 | } | |
e0007529 | 541 | |
c9180a57 EP |
542 | /* |
543 | * Allow filesystems with binary mount data to explicitly set mount point | |
544 | * labeling information. | |
545 | */ | |
e0007529 EP |
546 | static int selinux_set_mnt_opts(struct super_block *sb, |
547 | struct security_mnt_opts *opts) | |
c9180a57 EP |
548 | { |
549 | int rc = 0, i; | |
b6dff3ec | 550 | struct task_security_struct *tsec = current->cred->security; |
c9180a57 EP |
551 | struct superblock_security_struct *sbsec = sb->s_security; |
552 | const char *name = sb->s_type->name; | |
089be43e JM |
553 | struct inode *inode = sbsec->sb->s_root->d_inode; |
554 | struct inode_security_struct *root_isec = inode->i_security; | |
c9180a57 EP |
555 | u32 fscontext_sid = 0, context_sid = 0, rootcontext_sid = 0; |
556 | u32 defcontext_sid = 0; | |
e0007529 EP |
557 | char **mount_options = opts->mnt_opts; |
558 | int *flags = opts->mnt_opts_flags; | |
559 | int num_opts = opts->num_mnt_opts; | |
c9180a57 EP |
560 | |
561 | mutex_lock(&sbsec->lock); | |
562 | ||
563 | if (!ss_initialized) { | |
564 | if (!num_opts) { | |
565 | /* Defer initialization until selinux_complete_init, | |
566 | after the initial policy is loaded and the security | |
567 | server is ready to handle calls. */ | |
568 | spin_lock(&sb_security_lock); | |
569 | if (list_empty(&sbsec->list)) | |
570 | list_add(&sbsec->list, &superblock_security_head); | |
571 | spin_unlock(&sb_security_lock); | |
572 | goto out; | |
573 | } | |
574 | rc = -EINVAL; | |
744ba35e EP |
575 | printk(KERN_WARNING "SELinux: Unable to set superblock options " |
576 | "before the security server is initialized\n"); | |
1da177e4 | 577 | goto out; |
c9180a57 | 578 | } |
1da177e4 | 579 | |
e0007529 EP |
580 | /* |
581 | * Binary mount data FS will come through this function twice. Once | |
582 | * from an explicit call and once from the generic calls from the vfs. | |
583 | * Since the generic VFS calls will not contain any security mount data | |
584 | * we need to skip the double mount verification. | |
585 | * | |
586 | * This does open a hole in which we will not notice if the first | |
587 | * mount using this sb set explict options and a second mount using | |
588 | * this sb does not set any security options. (The first options | |
589 | * will be used for both mounts) | |
590 | */ | |
591 | if (sbsec->initialized && (sb->s_type->fs_flags & FS_BINARY_MOUNTDATA) | |
592 | && (num_opts == 0)) | |
f5269710 | 593 | goto out; |
e0007529 | 594 | |
c9180a57 EP |
595 | /* |
596 | * parse the mount options, check if they are valid sids. | |
597 | * also check if someone is trying to mount the same sb more | |
598 | * than once with different security options. | |
599 | */ | |
600 | for (i = 0; i < num_opts; i++) { | |
601 | u32 sid; | |
602 | rc = security_context_to_sid(mount_options[i], | |
603 | strlen(mount_options[i]), &sid); | |
1da177e4 LT |
604 | if (rc) { |
605 | printk(KERN_WARNING "SELinux: security_context_to_sid" | |
606 | "(%s) failed for (dev %s, type %s) errno=%d\n", | |
c9180a57 EP |
607 | mount_options[i], sb->s_id, name, rc); |
608 | goto out; | |
609 | } | |
610 | switch (flags[i]) { | |
611 | case FSCONTEXT_MNT: | |
612 | fscontext_sid = sid; | |
613 | ||
614 | if (bad_option(sbsec, FSCONTEXT_MNT, sbsec->sid, | |
615 | fscontext_sid)) | |
616 | goto out_double_mount; | |
617 | ||
618 | sbsec->flags |= FSCONTEXT_MNT; | |
619 | break; | |
620 | case CONTEXT_MNT: | |
621 | context_sid = sid; | |
622 | ||
623 | if (bad_option(sbsec, CONTEXT_MNT, sbsec->mntpoint_sid, | |
624 | context_sid)) | |
625 | goto out_double_mount; | |
626 | ||
627 | sbsec->flags |= CONTEXT_MNT; | |
628 | break; | |
629 | case ROOTCONTEXT_MNT: | |
630 | rootcontext_sid = sid; | |
631 | ||
632 | if (bad_option(sbsec, ROOTCONTEXT_MNT, root_isec->sid, | |
633 | rootcontext_sid)) | |
634 | goto out_double_mount; | |
635 | ||
636 | sbsec->flags |= ROOTCONTEXT_MNT; | |
637 | ||
638 | break; | |
639 | case DEFCONTEXT_MNT: | |
640 | defcontext_sid = sid; | |
641 | ||
642 | if (bad_option(sbsec, DEFCONTEXT_MNT, sbsec->def_sid, | |
643 | defcontext_sid)) | |
644 | goto out_double_mount; | |
645 | ||
646 | sbsec->flags |= DEFCONTEXT_MNT; | |
647 | ||
648 | break; | |
649 | default: | |
650 | rc = -EINVAL; | |
651 | goto out; | |
1da177e4 | 652 | } |
c9180a57 EP |
653 | } |
654 | ||
655 | if (sbsec->initialized) { | |
656 | /* previously mounted with options, but not on this attempt? */ | |
657 | if (sbsec->flags && !num_opts) | |
658 | goto out_double_mount; | |
659 | rc = 0; | |
660 | goto out; | |
661 | } | |
662 | ||
089be43e | 663 | if (strcmp(sb->s_type->name, "proc") == 0) |
c9180a57 EP |
664 | sbsec->proc = 1; |
665 | ||
666 | /* Determine the labeling behavior to use for this filesystem type. */ | |
089be43e | 667 | rc = security_fs_use(sb->s_type->name, &sbsec->behavior, &sbsec->sid); |
c9180a57 EP |
668 | if (rc) { |
669 | printk(KERN_WARNING "%s: security_fs_use(%s) returned %d\n", | |
089be43e | 670 | __func__, sb->s_type->name, rc); |
c9180a57 EP |
671 | goto out; |
672 | } | |
1da177e4 | 673 | |
c9180a57 EP |
674 | /* sets the context of the superblock for the fs being mounted. */ |
675 | if (fscontext_sid) { | |
676 | ||
677 | rc = may_context_mount_sb_relabel(fscontext_sid, sbsec, tsec); | |
1da177e4 | 678 | if (rc) |
c9180a57 | 679 | goto out; |
1da177e4 | 680 | |
c9180a57 | 681 | sbsec->sid = fscontext_sid; |
c312feb2 EP |
682 | } |
683 | ||
684 | /* | |
685 | * Switch to using mount point labeling behavior. | |
686 | * sets the label used on all file below the mountpoint, and will set | |
687 | * the superblock context if not already set. | |
688 | */ | |
c9180a57 EP |
689 | if (context_sid) { |
690 | if (!fscontext_sid) { | |
691 | rc = may_context_mount_sb_relabel(context_sid, sbsec, tsec); | |
b04ea3ce | 692 | if (rc) |
c9180a57 EP |
693 | goto out; |
694 | sbsec->sid = context_sid; | |
b04ea3ce | 695 | } else { |
c9180a57 | 696 | rc = may_context_mount_inode_relabel(context_sid, sbsec, tsec); |
b04ea3ce | 697 | if (rc) |
c9180a57 | 698 | goto out; |
b04ea3ce | 699 | } |
c9180a57 EP |
700 | if (!rootcontext_sid) |
701 | rootcontext_sid = context_sid; | |
1da177e4 | 702 | |
c9180a57 | 703 | sbsec->mntpoint_sid = context_sid; |
c312feb2 | 704 | sbsec->behavior = SECURITY_FS_USE_MNTPOINT; |
1da177e4 LT |
705 | } |
706 | ||
c9180a57 EP |
707 | if (rootcontext_sid) { |
708 | rc = may_context_mount_inode_relabel(rootcontext_sid, sbsec, tsec); | |
0808925e | 709 | if (rc) |
c9180a57 | 710 | goto out; |
0808925e | 711 | |
c9180a57 EP |
712 | root_isec->sid = rootcontext_sid; |
713 | root_isec->initialized = 1; | |
0808925e EP |
714 | } |
715 | ||
c9180a57 EP |
716 | if (defcontext_sid) { |
717 | if (sbsec->behavior != SECURITY_FS_USE_XATTR) { | |
718 | rc = -EINVAL; | |
719 | printk(KERN_WARNING "SELinux: defcontext option is " | |
720 | "invalid for this filesystem type\n"); | |
721 | goto out; | |
1da177e4 LT |
722 | } |
723 | ||
c9180a57 EP |
724 | if (defcontext_sid != sbsec->def_sid) { |
725 | rc = may_context_mount_inode_relabel(defcontext_sid, | |
726 | sbsec, tsec); | |
727 | if (rc) | |
728 | goto out; | |
729 | } | |
1da177e4 | 730 | |
c9180a57 | 731 | sbsec->def_sid = defcontext_sid; |
1da177e4 LT |
732 | } |
733 | ||
c9180a57 | 734 | rc = sb_finish_set_opts(sb); |
1da177e4 | 735 | out: |
c9180a57 | 736 | mutex_unlock(&sbsec->lock); |
1da177e4 | 737 | return rc; |
c9180a57 EP |
738 | out_double_mount: |
739 | rc = -EINVAL; | |
740 | printk(KERN_WARNING "SELinux: mount invalid. Same superblock, different " | |
741 | "security settings for (dev %s, type %s)\n", sb->s_id, name); | |
742 | goto out; | |
1da177e4 LT |
743 | } |
744 | ||
c9180a57 EP |
745 | static void selinux_sb_clone_mnt_opts(const struct super_block *oldsb, |
746 | struct super_block *newsb) | |
1da177e4 | 747 | { |
c9180a57 EP |
748 | const struct superblock_security_struct *oldsbsec = oldsb->s_security; |
749 | struct superblock_security_struct *newsbsec = newsb->s_security; | |
1da177e4 | 750 | |
c9180a57 EP |
751 | int set_fscontext = (oldsbsec->flags & FSCONTEXT_MNT); |
752 | int set_context = (oldsbsec->flags & CONTEXT_MNT); | |
753 | int set_rootcontext = (oldsbsec->flags & ROOTCONTEXT_MNT); | |
1da177e4 | 754 | |
0f5e6420 EP |
755 | /* |
756 | * if the parent was able to be mounted it clearly had no special lsm | |
757 | * mount options. thus we can safely put this sb on the list and deal | |
758 | * with it later | |
759 | */ | |
760 | if (!ss_initialized) { | |
761 | spin_lock(&sb_security_lock); | |
762 | if (list_empty(&newsbsec->list)) | |
763 | list_add(&newsbsec->list, &superblock_security_head); | |
764 | spin_unlock(&sb_security_lock); | |
765 | return; | |
766 | } | |
c9180a57 | 767 | |
c9180a57 EP |
768 | /* how can we clone if the old one wasn't set up?? */ |
769 | BUG_ON(!oldsbsec->initialized); | |
770 | ||
5a552617 EP |
771 | /* if fs is reusing a sb, just let its options stand... */ |
772 | if (newsbsec->initialized) | |
773 | return; | |
774 | ||
c9180a57 EP |
775 | mutex_lock(&newsbsec->lock); |
776 | ||
777 | newsbsec->flags = oldsbsec->flags; | |
778 | ||
779 | newsbsec->sid = oldsbsec->sid; | |
780 | newsbsec->def_sid = oldsbsec->def_sid; | |
781 | newsbsec->behavior = oldsbsec->behavior; | |
782 | ||
783 | if (set_context) { | |
784 | u32 sid = oldsbsec->mntpoint_sid; | |
785 | ||
786 | if (!set_fscontext) | |
787 | newsbsec->sid = sid; | |
788 | if (!set_rootcontext) { | |
789 | struct inode *newinode = newsb->s_root->d_inode; | |
790 | struct inode_security_struct *newisec = newinode->i_security; | |
791 | newisec->sid = sid; | |
792 | } | |
793 | newsbsec->mntpoint_sid = sid; | |
1da177e4 | 794 | } |
c9180a57 EP |
795 | if (set_rootcontext) { |
796 | const struct inode *oldinode = oldsb->s_root->d_inode; | |
797 | const struct inode_security_struct *oldisec = oldinode->i_security; | |
798 | struct inode *newinode = newsb->s_root->d_inode; | |
799 | struct inode_security_struct *newisec = newinode->i_security; | |
1da177e4 | 800 | |
c9180a57 | 801 | newisec->sid = oldisec->sid; |
1da177e4 LT |
802 | } |
803 | ||
c9180a57 EP |
804 | sb_finish_set_opts(newsb); |
805 | mutex_unlock(&newsbsec->lock); | |
806 | } | |
807 | ||
2e1479d9 AB |
808 | static int selinux_parse_opts_str(char *options, |
809 | struct security_mnt_opts *opts) | |
c9180a57 | 810 | { |
e0007529 | 811 | char *p; |
c9180a57 EP |
812 | char *context = NULL, *defcontext = NULL; |
813 | char *fscontext = NULL, *rootcontext = NULL; | |
e0007529 | 814 | int rc, num_mnt_opts = 0; |
1da177e4 | 815 | |
e0007529 | 816 | opts->num_mnt_opts = 0; |
1da177e4 | 817 | |
c9180a57 EP |
818 | /* Standard string-based options. */ |
819 | while ((p = strsep(&options, "|")) != NULL) { | |
820 | int token; | |
821 | substring_t args[MAX_OPT_ARGS]; | |
1da177e4 | 822 | |
c9180a57 EP |
823 | if (!*p) |
824 | continue; | |
1da177e4 | 825 | |
c9180a57 | 826 | token = match_token(p, tokens, args); |
1da177e4 | 827 | |
c9180a57 EP |
828 | switch (token) { |
829 | case Opt_context: | |
830 | if (context || defcontext) { | |
831 | rc = -EINVAL; | |
832 | printk(KERN_WARNING SEL_MOUNT_FAIL_MSG); | |
833 | goto out_err; | |
834 | } | |
835 | context = match_strdup(&args[0]); | |
836 | if (!context) { | |
837 | rc = -ENOMEM; | |
838 | goto out_err; | |
839 | } | |
840 | break; | |
841 | ||
842 | case Opt_fscontext: | |
843 | if (fscontext) { | |
844 | rc = -EINVAL; | |
845 | printk(KERN_WARNING SEL_MOUNT_FAIL_MSG); | |
846 | goto out_err; | |
847 | } | |
848 | fscontext = match_strdup(&args[0]); | |
849 | if (!fscontext) { | |
850 | rc = -ENOMEM; | |
851 | goto out_err; | |
852 | } | |
853 | break; | |
854 | ||
855 | case Opt_rootcontext: | |
856 | if (rootcontext) { | |
857 | rc = -EINVAL; | |
858 | printk(KERN_WARNING SEL_MOUNT_FAIL_MSG); | |
859 | goto out_err; | |
860 | } | |
861 | rootcontext = match_strdup(&args[0]); | |
862 | if (!rootcontext) { | |
863 | rc = -ENOMEM; | |
864 | goto out_err; | |
865 | } | |
866 | break; | |
867 | ||
868 | case Opt_defcontext: | |
869 | if (context || defcontext) { | |
870 | rc = -EINVAL; | |
871 | printk(KERN_WARNING SEL_MOUNT_FAIL_MSG); | |
872 | goto out_err; | |
873 | } | |
874 | defcontext = match_strdup(&args[0]); | |
875 | if (!defcontext) { | |
876 | rc = -ENOMEM; | |
877 | goto out_err; | |
878 | } | |
879 | break; | |
880 | ||
881 | default: | |
882 | rc = -EINVAL; | |
883 | printk(KERN_WARNING "SELinux: unknown mount option\n"); | |
884 | goto out_err; | |
1da177e4 | 885 | |
1da177e4 | 886 | } |
1da177e4 | 887 | } |
c9180a57 | 888 | |
e0007529 EP |
889 | rc = -ENOMEM; |
890 | opts->mnt_opts = kcalloc(NUM_SEL_MNT_OPTS, sizeof(char *), GFP_ATOMIC); | |
891 | if (!opts->mnt_opts) | |
892 | goto out_err; | |
893 | ||
894 | opts->mnt_opts_flags = kcalloc(NUM_SEL_MNT_OPTS, sizeof(int), GFP_ATOMIC); | |
895 | if (!opts->mnt_opts_flags) { | |
896 | kfree(opts->mnt_opts); | |
897 | goto out_err; | |
898 | } | |
899 | ||
c9180a57 | 900 | if (fscontext) { |
e0007529 EP |
901 | opts->mnt_opts[num_mnt_opts] = fscontext; |
902 | opts->mnt_opts_flags[num_mnt_opts++] = FSCONTEXT_MNT; | |
c9180a57 EP |
903 | } |
904 | if (context) { | |
e0007529 EP |
905 | opts->mnt_opts[num_mnt_opts] = context; |
906 | opts->mnt_opts_flags[num_mnt_opts++] = CONTEXT_MNT; | |
c9180a57 EP |
907 | } |
908 | if (rootcontext) { | |
e0007529 EP |
909 | opts->mnt_opts[num_mnt_opts] = rootcontext; |
910 | opts->mnt_opts_flags[num_mnt_opts++] = ROOTCONTEXT_MNT; | |
c9180a57 EP |
911 | } |
912 | if (defcontext) { | |
e0007529 EP |
913 | opts->mnt_opts[num_mnt_opts] = defcontext; |
914 | opts->mnt_opts_flags[num_mnt_opts++] = DEFCONTEXT_MNT; | |
c9180a57 EP |
915 | } |
916 | ||
e0007529 EP |
917 | opts->num_mnt_opts = num_mnt_opts; |
918 | return 0; | |
919 | ||
c9180a57 EP |
920 | out_err: |
921 | kfree(context); | |
922 | kfree(defcontext); | |
923 | kfree(fscontext); | |
924 | kfree(rootcontext); | |
1da177e4 LT |
925 | return rc; |
926 | } | |
e0007529 EP |
927 | /* |
928 | * string mount options parsing and call set the sbsec | |
929 | */ | |
930 | static int superblock_doinit(struct super_block *sb, void *data) | |
931 | { | |
932 | int rc = 0; | |
933 | char *options = data; | |
934 | struct security_mnt_opts opts; | |
935 | ||
936 | security_init_mnt_opts(&opts); | |
937 | ||
938 | if (!data) | |
939 | goto out; | |
940 | ||
941 | BUG_ON(sb->s_type->fs_flags & FS_BINARY_MOUNTDATA); | |
942 | ||
943 | rc = selinux_parse_opts_str(options, &opts); | |
944 | if (rc) | |
945 | goto out_err; | |
946 | ||
947 | out: | |
948 | rc = selinux_set_mnt_opts(sb, &opts); | |
949 | ||
950 | out_err: | |
951 | security_free_mnt_opts(&opts); | |
952 | return rc; | |
953 | } | |
1da177e4 | 954 | |
3583a711 AB |
955 | static void selinux_write_opts(struct seq_file *m, |
956 | struct security_mnt_opts *opts) | |
2069f457 EP |
957 | { |
958 | int i; | |
959 | char *prefix; | |
960 | ||
961 | for (i = 0; i < opts->num_mnt_opts; i++) { | |
962 | char *has_comma = strchr(opts->mnt_opts[i], ','); | |
963 | ||
964 | switch (opts->mnt_opts_flags[i]) { | |
965 | case CONTEXT_MNT: | |
966 | prefix = CONTEXT_STR; | |
967 | break; | |
968 | case FSCONTEXT_MNT: | |
969 | prefix = FSCONTEXT_STR; | |
970 | break; | |
971 | case ROOTCONTEXT_MNT: | |
972 | prefix = ROOTCONTEXT_STR; | |
973 | break; | |
974 | case DEFCONTEXT_MNT: | |
975 | prefix = DEFCONTEXT_STR; | |
976 | break; | |
977 | default: | |
978 | BUG(); | |
979 | }; | |
980 | /* we need a comma before each option */ | |
981 | seq_putc(m, ','); | |
982 | seq_puts(m, prefix); | |
983 | if (has_comma) | |
984 | seq_putc(m, '\"'); | |
985 | seq_puts(m, opts->mnt_opts[i]); | |
986 | if (has_comma) | |
987 | seq_putc(m, '\"'); | |
988 | } | |
989 | } | |
990 | ||
991 | static int selinux_sb_show_options(struct seq_file *m, struct super_block *sb) | |
992 | { | |
993 | struct security_mnt_opts opts; | |
994 | int rc; | |
995 | ||
996 | rc = selinux_get_mnt_opts(sb, &opts); | |
383795c2 EP |
997 | if (rc) { |
998 | /* before policy load we may get EINVAL, don't show anything */ | |
999 | if (rc == -EINVAL) | |
1000 | rc = 0; | |
2069f457 | 1001 | return rc; |
383795c2 | 1002 | } |
2069f457 EP |
1003 | |
1004 | selinux_write_opts(m, &opts); | |
1005 | ||
1006 | security_free_mnt_opts(&opts); | |
1007 | ||
1008 | return rc; | |
1009 | } | |
1010 | ||
1da177e4 LT |
1011 | static inline u16 inode_mode_to_security_class(umode_t mode) |
1012 | { | |
1013 | switch (mode & S_IFMT) { | |
1014 | case S_IFSOCK: | |
1015 | return SECCLASS_SOCK_FILE; | |
1016 | case S_IFLNK: | |
1017 | return SECCLASS_LNK_FILE; | |
1018 | case S_IFREG: | |
1019 | return SECCLASS_FILE; | |
1020 | case S_IFBLK: | |
1021 | return SECCLASS_BLK_FILE; | |
1022 | case S_IFDIR: | |
1023 | return SECCLASS_DIR; | |
1024 | case S_IFCHR: | |
1025 | return SECCLASS_CHR_FILE; | |
1026 | case S_IFIFO: | |
1027 | return SECCLASS_FIFO_FILE; | |
1028 | ||
1029 | } | |
1030 | ||
1031 | return SECCLASS_FILE; | |
1032 | } | |
1033 | ||
13402580 JM |
1034 | static inline int default_protocol_stream(int protocol) |
1035 | { | |
1036 | return (protocol == IPPROTO_IP || protocol == IPPROTO_TCP); | |
1037 | } | |
1038 | ||
1039 | static inline int default_protocol_dgram(int protocol) | |
1040 | { | |
1041 | return (protocol == IPPROTO_IP || protocol == IPPROTO_UDP); | |
1042 | } | |
1043 | ||
1da177e4 LT |
1044 | static inline u16 socket_type_to_security_class(int family, int type, int protocol) |
1045 | { | |
1046 | switch (family) { | |
1047 | case PF_UNIX: | |
1048 | switch (type) { | |
1049 | case SOCK_STREAM: | |
1050 | case SOCK_SEQPACKET: | |
1051 | return SECCLASS_UNIX_STREAM_SOCKET; | |
1052 | case SOCK_DGRAM: | |
1053 | return SECCLASS_UNIX_DGRAM_SOCKET; | |
1054 | } | |
1055 | break; | |
1056 | case PF_INET: | |
1057 | case PF_INET6: | |
1058 | switch (type) { | |
1059 | case SOCK_STREAM: | |
13402580 JM |
1060 | if (default_protocol_stream(protocol)) |
1061 | return SECCLASS_TCP_SOCKET; | |
1062 | else | |
1063 | return SECCLASS_RAWIP_SOCKET; | |
1da177e4 | 1064 | case SOCK_DGRAM: |
13402580 JM |
1065 | if (default_protocol_dgram(protocol)) |
1066 | return SECCLASS_UDP_SOCKET; | |
1067 | else | |
1068 | return SECCLASS_RAWIP_SOCKET; | |
2ee92d46 JM |
1069 | case SOCK_DCCP: |
1070 | return SECCLASS_DCCP_SOCKET; | |
13402580 | 1071 | default: |
1da177e4 LT |
1072 | return SECCLASS_RAWIP_SOCKET; |
1073 | } | |
1074 | break; | |
1075 | case PF_NETLINK: | |
1076 | switch (protocol) { | |
1077 | case NETLINK_ROUTE: | |
1078 | return SECCLASS_NETLINK_ROUTE_SOCKET; | |
1079 | case NETLINK_FIREWALL: | |
1080 | return SECCLASS_NETLINK_FIREWALL_SOCKET; | |
216efaaa | 1081 | case NETLINK_INET_DIAG: |
1da177e4 LT |
1082 | return SECCLASS_NETLINK_TCPDIAG_SOCKET; |
1083 | case NETLINK_NFLOG: | |
1084 | return SECCLASS_NETLINK_NFLOG_SOCKET; | |
1085 | case NETLINK_XFRM: | |
1086 | return SECCLASS_NETLINK_XFRM_SOCKET; | |
1087 | case NETLINK_SELINUX: | |
1088 | return SECCLASS_NETLINK_SELINUX_SOCKET; | |
1089 | case NETLINK_AUDIT: | |
1090 | return SECCLASS_NETLINK_AUDIT_SOCKET; | |
1091 | case NETLINK_IP6_FW: | |
1092 | return SECCLASS_NETLINK_IP6FW_SOCKET; | |
1093 | case NETLINK_DNRTMSG: | |
1094 | return SECCLASS_NETLINK_DNRT_SOCKET; | |
0c9b7942 JM |
1095 | case NETLINK_KOBJECT_UEVENT: |
1096 | return SECCLASS_NETLINK_KOBJECT_UEVENT_SOCKET; | |
1da177e4 LT |
1097 | default: |
1098 | return SECCLASS_NETLINK_SOCKET; | |
1099 | } | |
1100 | case PF_PACKET: | |
1101 | return SECCLASS_PACKET_SOCKET; | |
1102 | case PF_KEY: | |
1103 | return SECCLASS_KEY_SOCKET; | |
3e3ff15e CP |
1104 | case PF_APPLETALK: |
1105 | return SECCLASS_APPLETALK_SOCKET; | |
1da177e4 LT |
1106 | } |
1107 | ||
1108 | return SECCLASS_SOCKET; | |
1109 | } | |
1110 | ||
1111 | #ifdef CONFIG_PROC_FS | |
1112 | static int selinux_proc_get_sid(struct proc_dir_entry *de, | |
1113 | u16 tclass, | |
1114 | u32 *sid) | |
1115 | { | |
1116 | int buflen, rc; | |
1117 | char *buffer, *path, *end; | |
1118 | ||
828dfe1d | 1119 | buffer = (char *)__get_free_page(GFP_KERNEL); |
1da177e4 LT |
1120 | if (!buffer) |
1121 | return -ENOMEM; | |
1122 | ||
1123 | buflen = PAGE_SIZE; | |
1124 | end = buffer+buflen; | |
1125 | *--end = '\0'; | |
1126 | buflen--; | |
1127 | path = end-1; | |
1128 | *path = '/'; | |
1129 | while (de && de != de->parent) { | |
1130 | buflen -= de->namelen + 1; | |
1131 | if (buflen < 0) | |
1132 | break; | |
1133 | end -= de->namelen; | |
1134 | memcpy(end, de->name, de->namelen); | |
1135 | *--end = '/'; | |
1136 | path = end; | |
1137 | de = de->parent; | |
1138 | } | |
1139 | rc = security_genfs_sid("proc", path, tclass, sid); | |
1140 | free_page((unsigned long)buffer); | |
1141 | return rc; | |
1142 | } | |
1143 | #else | |
1144 | static int selinux_proc_get_sid(struct proc_dir_entry *de, | |
1145 | u16 tclass, | |
1146 | u32 *sid) | |
1147 | { | |
1148 | return -EINVAL; | |
1149 | } | |
1150 | #endif | |
1151 | ||
1152 | /* The inode's security attributes must be initialized before first use. */ | |
1153 | static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dentry) | |
1154 | { | |
1155 | struct superblock_security_struct *sbsec = NULL; | |
1156 | struct inode_security_struct *isec = inode->i_security; | |
1157 | u32 sid; | |
1158 | struct dentry *dentry; | |
1159 | #define INITCONTEXTLEN 255 | |
1160 | char *context = NULL; | |
1161 | unsigned len = 0; | |
1162 | int rc = 0; | |
1da177e4 LT |
1163 | |
1164 | if (isec->initialized) | |
1165 | goto out; | |
1166 | ||
23970741 | 1167 | mutex_lock(&isec->lock); |
1da177e4 | 1168 | if (isec->initialized) |
23970741 | 1169 | goto out_unlock; |
1da177e4 LT |
1170 | |
1171 | sbsec = inode->i_sb->s_security; | |
1172 | if (!sbsec->initialized) { | |
1173 | /* Defer initialization until selinux_complete_init, | |
1174 | after the initial policy is loaded and the security | |
1175 | server is ready to handle calls. */ | |
1176 | spin_lock(&sbsec->isec_lock); | |
1177 | if (list_empty(&isec->list)) | |
1178 | list_add(&isec->list, &sbsec->isec_head); | |
1179 | spin_unlock(&sbsec->isec_lock); | |
23970741 | 1180 | goto out_unlock; |
1da177e4 LT |
1181 | } |
1182 | ||
1183 | switch (sbsec->behavior) { | |
1184 | case SECURITY_FS_USE_XATTR: | |
1185 | if (!inode->i_op->getxattr) { | |
1186 | isec->sid = sbsec->def_sid; | |
1187 | break; | |
1188 | } | |
1189 | ||
1190 | /* Need a dentry, since the xattr API requires one. | |
1191 | Life would be simpler if we could just pass the inode. */ | |
1192 | if (opt_dentry) { | |
1193 | /* Called from d_instantiate or d_splice_alias. */ | |
1194 | dentry = dget(opt_dentry); | |
1195 | } else { | |
1196 | /* Called from selinux_complete_init, try to find a dentry. */ | |
1197 | dentry = d_find_alias(inode); | |
1198 | } | |
1199 | if (!dentry) { | |
744ba35e | 1200 | printk(KERN_WARNING "SELinux: %s: no dentry for dev=%s " |
dd6f953a | 1201 | "ino=%ld\n", __func__, inode->i_sb->s_id, |
1da177e4 | 1202 | inode->i_ino); |
23970741 | 1203 | goto out_unlock; |
1da177e4 LT |
1204 | } |
1205 | ||
1206 | len = INITCONTEXTLEN; | |
869ab514 | 1207 | context = kmalloc(len, GFP_NOFS); |
1da177e4 LT |
1208 | if (!context) { |
1209 | rc = -ENOMEM; | |
1210 | dput(dentry); | |
23970741 | 1211 | goto out_unlock; |
1da177e4 LT |
1212 | } |
1213 | rc = inode->i_op->getxattr(dentry, XATTR_NAME_SELINUX, | |
1214 | context, len); | |
1215 | if (rc == -ERANGE) { | |
1216 | /* Need a larger buffer. Query for the right size. */ | |
1217 | rc = inode->i_op->getxattr(dentry, XATTR_NAME_SELINUX, | |
1218 | NULL, 0); | |
1219 | if (rc < 0) { | |
1220 | dput(dentry); | |
23970741 | 1221 | goto out_unlock; |
1da177e4 LT |
1222 | } |
1223 | kfree(context); | |
1224 | len = rc; | |
869ab514 | 1225 | context = kmalloc(len, GFP_NOFS); |
1da177e4 LT |
1226 | if (!context) { |
1227 | rc = -ENOMEM; | |
1228 | dput(dentry); | |
23970741 | 1229 | goto out_unlock; |
1da177e4 LT |
1230 | } |
1231 | rc = inode->i_op->getxattr(dentry, | |
1232 | XATTR_NAME_SELINUX, | |
1233 | context, len); | |
1234 | } | |
1235 | dput(dentry); | |
1236 | if (rc < 0) { | |
1237 | if (rc != -ENODATA) { | |
744ba35e | 1238 | printk(KERN_WARNING "SELinux: %s: getxattr returned " |
dd6f953a | 1239 | "%d for dev=%s ino=%ld\n", __func__, |
1da177e4 LT |
1240 | -rc, inode->i_sb->s_id, inode->i_ino); |
1241 | kfree(context); | |
23970741 | 1242 | goto out_unlock; |
1da177e4 LT |
1243 | } |
1244 | /* Map ENODATA to the default file SID */ | |
1245 | sid = sbsec->def_sid; | |
1246 | rc = 0; | |
1247 | } else { | |
f5c1d5b2 | 1248 | rc = security_context_to_sid_default(context, rc, &sid, |
869ab514 SS |
1249 | sbsec->def_sid, |
1250 | GFP_NOFS); | |
1da177e4 | 1251 | if (rc) { |
744ba35e | 1252 | printk(KERN_WARNING "SELinux: %s: context_to_sid(%s) " |
1da177e4 | 1253 | "returned %d for dev=%s ino=%ld\n", |
dd6f953a | 1254 | __func__, context, -rc, |
1da177e4 LT |
1255 | inode->i_sb->s_id, inode->i_ino); |
1256 | kfree(context); | |
1257 | /* Leave with the unlabeled SID */ | |
1258 | rc = 0; | |
1259 | break; | |
1260 | } | |
1261 | } | |
1262 | kfree(context); | |
1263 | isec->sid = sid; | |
1264 | break; | |
1265 | case SECURITY_FS_USE_TASK: | |
1266 | isec->sid = isec->task_sid; | |
1267 | break; | |
1268 | case SECURITY_FS_USE_TRANS: | |
1269 | /* Default to the fs SID. */ | |
1270 | isec->sid = sbsec->sid; | |
1271 | ||
1272 | /* Try to obtain a transition SID. */ | |
1273 | isec->sclass = inode_mode_to_security_class(inode->i_mode); | |
1274 | rc = security_transition_sid(isec->task_sid, | |
1275 | sbsec->sid, | |
1276 | isec->sclass, | |
1277 | &sid); | |
1278 | if (rc) | |
23970741 | 1279 | goto out_unlock; |
1da177e4 LT |
1280 | isec->sid = sid; |
1281 | break; | |
c312feb2 EP |
1282 | case SECURITY_FS_USE_MNTPOINT: |
1283 | isec->sid = sbsec->mntpoint_sid; | |
1284 | break; | |
1da177e4 | 1285 | default: |
c312feb2 | 1286 | /* Default to the fs superblock SID. */ |
1da177e4 LT |
1287 | isec->sid = sbsec->sid; |
1288 | ||
ea6b184f | 1289 | if (sbsec->proc && !S_ISLNK(inode->i_mode)) { |
1da177e4 LT |
1290 | struct proc_inode *proci = PROC_I(inode); |
1291 | if (proci->pde) { | |
1292 | isec->sclass = inode_mode_to_security_class(inode->i_mode); | |
1293 | rc = selinux_proc_get_sid(proci->pde, | |
1294 | isec->sclass, | |
1295 | &sid); | |
1296 | if (rc) | |
23970741 | 1297 | goto out_unlock; |
1da177e4 LT |
1298 | isec->sid = sid; |
1299 | } | |
1300 | } | |
1301 | break; | |
1302 | } | |
1303 | ||
1304 | isec->initialized = 1; | |
1305 | ||
23970741 EP |
1306 | out_unlock: |
1307 | mutex_unlock(&isec->lock); | |
1da177e4 LT |
1308 | out: |
1309 | if (isec->sclass == SECCLASS_FILE) | |
1310 | isec->sclass = inode_mode_to_security_class(inode->i_mode); | |
1da177e4 LT |
1311 | return rc; |
1312 | } | |
1313 | ||
1314 | /* Convert a Linux signal to an access vector. */ | |
1315 | static inline u32 signal_to_av(int sig) | |
1316 | { | |
1317 | u32 perm = 0; | |
1318 | ||
1319 | switch (sig) { | |
1320 | case SIGCHLD: | |
1321 | /* Commonly granted from child to parent. */ | |
1322 | perm = PROCESS__SIGCHLD; | |
1323 | break; | |
1324 | case SIGKILL: | |
1325 | /* Cannot be caught or ignored */ | |
1326 | perm = PROCESS__SIGKILL; | |
1327 | break; | |
1328 | case SIGSTOP: | |
1329 | /* Cannot be caught or ignored */ | |
1330 | perm = PROCESS__SIGSTOP; | |
1331 | break; | |
1332 | default: | |
1333 | /* All other signals. */ | |
1334 | perm = PROCESS__SIGNAL; | |
1335 | break; | |
1336 | } | |
1337 | ||
1338 | return perm; | |
1339 | } | |
1340 | ||
1341 | /* Check permission betweeen a pair of tasks, e.g. signal checks, | |
1342 | fork check, ptrace check, etc. */ | |
1343 | static int task_has_perm(struct task_struct *tsk1, | |
1344 | struct task_struct *tsk2, | |
1345 | u32 perms) | |
1346 | { | |
1347 | struct task_security_struct *tsec1, *tsec2; | |
1348 | ||
b6dff3ec DH |
1349 | tsec1 = tsk1->cred->security; |
1350 | tsec2 = tsk2->cred->security; | |
1da177e4 LT |
1351 | return avc_has_perm(tsec1->sid, tsec2->sid, |
1352 | SECCLASS_PROCESS, perms, NULL); | |
1353 | } | |
1354 | ||
b68e418c SS |
1355 | #if CAP_LAST_CAP > 63 |
1356 | #error Fix SELinux to handle capabilities > 63. | |
1357 | #endif | |
1358 | ||
1da177e4 LT |
1359 | /* Check whether a task is allowed to use a capability. */ |
1360 | static int task_has_capability(struct task_struct *tsk, | |
06112163 | 1361 | int cap, int audit) |
1da177e4 LT |
1362 | { |
1363 | struct task_security_struct *tsec; | |
1364 | struct avc_audit_data ad; | |
06112163 | 1365 | struct av_decision avd; |
b68e418c SS |
1366 | u16 sclass; |
1367 | u32 av = CAP_TO_MASK(cap); | |
06112163 | 1368 | int rc; |
1da177e4 | 1369 | |
b6dff3ec | 1370 | tsec = tsk->cred->security; |
1da177e4 | 1371 | |
828dfe1d | 1372 | AVC_AUDIT_DATA_INIT(&ad, CAP); |
1da177e4 LT |
1373 | ad.tsk = tsk; |
1374 | ad.u.cap = cap; | |
1375 | ||
b68e418c SS |
1376 | switch (CAP_TO_INDEX(cap)) { |
1377 | case 0: | |
1378 | sclass = SECCLASS_CAPABILITY; | |
1379 | break; | |
1380 | case 1: | |
1381 | sclass = SECCLASS_CAPABILITY2; | |
1382 | break; | |
1383 | default: | |
1384 | printk(KERN_ERR | |
1385 | "SELinux: out of range capability %d\n", cap); | |
1386 | BUG(); | |
1387 | } | |
06112163 EP |
1388 | |
1389 | rc = avc_has_perm_noaudit(tsec->sid, tsec->sid, sclass, av, 0, &avd); | |
1390 | if (audit == SECURITY_CAP_AUDIT) | |
1391 | avc_audit(tsec->sid, tsec->sid, sclass, av, &avd, rc, &ad); | |
1392 | return rc; | |
1da177e4 LT |
1393 | } |
1394 | ||
1395 | /* Check whether a task is allowed to use a system operation. */ | |
1396 | static int task_has_system(struct task_struct *tsk, | |
1397 | u32 perms) | |
1398 | { | |
1399 | struct task_security_struct *tsec; | |
1400 | ||
b6dff3ec | 1401 | tsec = tsk->cred->security; |
1da177e4 LT |
1402 | |
1403 | return avc_has_perm(tsec->sid, SECINITSID_KERNEL, | |
1404 | SECCLASS_SYSTEM, perms, NULL); | |
1405 | } | |
1406 | ||
1407 | /* Check whether a task has a particular permission to an inode. | |
1408 | The 'adp' parameter is optional and allows other audit | |
1409 | data to be passed (e.g. the dentry). */ | |
1410 | static int inode_has_perm(struct task_struct *tsk, | |
1411 | struct inode *inode, | |
1412 | u32 perms, | |
1413 | struct avc_audit_data *adp) | |
1414 | { | |
1415 | struct task_security_struct *tsec; | |
1416 | struct inode_security_struct *isec; | |
1417 | struct avc_audit_data ad; | |
1418 | ||
828dfe1d | 1419 | if (unlikely(IS_PRIVATE(inode))) |
bbaca6c2 SS |
1420 | return 0; |
1421 | ||
b6dff3ec | 1422 | tsec = tsk->cred->security; |
1da177e4 LT |
1423 | isec = inode->i_security; |
1424 | ||
1425 | if (!adp) { | |
1426 | adp = &ad; | |
1427 | AVC_AUDIT_DATA_INIT(&ad, FS); | |
1428 | ad.u.fs.inode = inode; | |
1429 | } | |
1430 | ||
1431 | return avc_has_perm(tsec->sid, isec->sid, isec->sclass, perms, adp); | |
1432 | } | |
1433 | ||
1434 | /* Same as inode_has_perm, but pass explicit audit data containing | |
1435 | the dentry to help the auditing code to more easily generate the | |
1436 | pathname if needed. */ | |
1437 | static inline int dentry_has_perm(struct task_struct *tsk, | |
1438 | struct vfsmount *mnt, | |
1439 | struct dentry *dentry, | |
1440 | u32 av) | |
1441 | { | |
1442 | struct inode *inode = dentry->d_inode; | |
1443 | struct avc_audit_data ad; | |
828dfe1d | 1444 | AVC_AUDIT_DATA_INIT(&ad, FS); |
44707fdf JB |
1445 | ad.u.fs.path.mnt = mnt; |
1446 | ad.u.fs.path.dentry = dentry; | |
1da177e4 LT |
1447 | return inode_has_perm(tsk, inode, av, &ad); |
1448 | } | |
1449 | ||
1450 | /* Check whether a task can use an open file descriptor to | |
1451 | access an inode in a given way. Check access to the | |
1452 | descriptor itself, and then use dentry_has_perm to | |
1453 | check a particular permission to the file. | |
1454 | Access to the descriptor is implicitly granted if it | |
1455 | has the same SID as the process. If av is zero, then | |
1456 | access to the file is not checked, e.g. for cases | |
1457 | where only the descriptor is affected like seek. */ | |
858119e1 | 1458 | static int file_has_perm(struct task_struct *tsk, |
1da177e4 LT |
1459 | struct file *file, |
1460 | u32 av) | |
1461 | { | |
b6dff3ec | 1462 | struct task_security_struct *tsec = tsk->cred->security; |
1da177e4 | 1463 | struct file_security_struct *fsec = file->f_security; |
44707fdf | 1464 | struct inode *inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
1465 | struct avc_audit_data ad; |
1466 | int rc; | |
1467 | ||
1468 | AVC_AUDIT_DATA_INIT(&ad, FS); | |
44707fdf | 1469 | ad.u.fs.path = file->f_path; |
1da177e4 LT |
1470 | |
1471 | if (tsec->sid != fsec->sid) { | |
1472 | rc = avc_has_perm(tsec->sid, fsec->sid, | |
1473 | SECCLASS_FD, | |
1474 | FD__USE, | |
1475 | &ad); | |
1476 | if (rc) | |
1477 | return rc; | |
1478 | } | |
1479 | ||
1480 | /* av is zero if only checking access to the descriptor. */ | |
1481 | if (av) | |
1482 | return inode_has_perm(tsk, inode, av, &ad); | |
1483 | ||
1484 | return 0; | |
1485 | } | |
1486 | ||
1487 | /* Check whether a task can create a file. */ | |
1488 | static int may_create(struct inode *dir, | |
1489 | struct dentry *dentry, | |
1490 | u16 tclass) | |
1491 | { | |
1492 | struct task_security_struct *tsec; | |
1493 | struct inode_security_struct *dsec; | |
1494 | struct superblock_security_struct *sbsec; | |
1495 | u32 newsid; | |
1496 | struct avc_audit_data ad; | |
1497 | int rc; | |
1498 | ||
b6dff3ec | 1499 | tsec = current->cred->security; |
1da177e4 LT |
1500 | dsec = dir->i_security; |
1501 | sbsec = dir->i_sb->s_security; | |
1502 | ||
1503 | AVC_AUDIT_DATA_INIT(&ad, FS); | |
44707fdf | 1504 | ad.u.fs.path.dentry = dentry; |
1da177e4 LT |
1505 | |
1506 | rc = avc_has_perm(tsec->sid, dsec->sid, SECCLASS_DIR, | |
1507 | DIR__ADD_NAME | DIR__SEARCH, | |
1508 | &ad); | |
1509 | if (rc) | |
1510 | return rc; | |
1511 | ||
1512 | if (tsec->create_sid && sbsec->behavior != SECURITY_FS_USE_MNTPOINT) { | |
1513 | newsid = tsec->create_sid; | |
1514 | } else { | |
1515 | rc = security_transition_sid(tsec->sid, dsec->sid, tclass, | |
1516 | &newsid); | |
1517 | if (rc) | |
1518 | return rc; | |
1519 | } | |
1520 | ||
1521 | rc = avc_has_perm(tsec->sid, newsid, tclass, FILE__CREATE, &ad); | |
1522 | if (rc) | |
1523 | return rc; | |
1524 | ||
1525 | return avc_has_perm(newsid, sbsec->sid, | |
1526 | SECCLASS_FILESYSTEM, | |
1527 | FILESYSTEM__ASSOCIATE, &ad); | |
1528 | } | |
1529 | ||
4eb582cf ML |
1530 | /* Check whether a task can create a key. */ |
1531 | static int may_create_key(u32 ksid, | |
1532 | struct task_struct *ctx) | |
1533 | { | |
1534 | struct task_security_struct *tsec; | |
1535 | ||
b6dff3ec | 1536 | tsec = ctx->cred->security; |
4eb582cf ML |
1537 | |
1538 | return avc_has_perm(tsec->sid, ksid, SECCLASS_KEY, KEY__CREATE, NULL); | |
1539 | } | |
1540 | ||
828dfe1d EP |
1541 | #define MAY_LINK 0 |
1542 | #define MAY_UNLINK 1 | |
1543 | #define MAY_RMDIR 2 | |
1da177e4 LT |
1544 | |
1545 | /* Check whether a task can link, unlink, or rmdir a file/directory. */ | |
1546 | static int may_link(struct inode *dir, | |
1547 | struct dentry *dentry, | |
1548 | int kind) | |
1549 | ||
1550 | { | |
1551 | struct task_security_struct *tsec; | |
1552 | struct inode_security_struct *dsec, *isec; | |
1553 | struct avc_audit_data ad; | |
1554 | u32 av; | |
1555 | int rc; | |
1556 | ||
b6dff3ec | 1557 | tsec = current->cred->security; |
1da177e4 LT |
1558 | dsec = dir->i_security; |
1559 | isec = dentry->d_inode->i_security; | |
1560 | ||
1561 | AVC_AUDIT_DATA_INIT(&ad, FS); | |
44707fdf | 1562 | ad.u.fs.path.dentry = dentry; |
1da177e4 LT |
1563 | |
1564 | av = DIR__SEARCH; | |
1565 | av |= (kind ? DIR__REMOVE_NAME : DIR__ADD_NAME); | |
1566 | rc = avc_has_perm(tsec->sid, dsec->sid, SECCLASS_DIR, av, &ad); | |
1567 | if (rc) | |
1568 | return rc; | |
1569 | ||
1570 | switch (kind) { | |
1571 | case MAY_LINK: | |
1572 | av = FILE__LINK; | |
1573 | break; | |
1574 | case MAY_UNLINK: | |
1575 | av = FILE__UNLINK; | |
1576 | break; | |
1577 | case MAY_RMDIR: | |
1578 | av = DIR__RMDIR; | |
1579 | break; | |
1580 | default: | |
744ba35e EP |
1581 | printk(KERN_WARNING "SELinux: %s: unrecognized kind %d\n", |
1582 | __func__, kind); | |
1da177e4 LT |
1583 | return 0; |
1584 | } | |
1585 | ||
1586 | rc = avc_has_perm(tsec->sid, isec->sid, isec->sclass, av, &ad); | |
1587 | return rc; | |
1588 | } | |
1589 | ||
1590 | static inline int may_rename(struct inode *old_dir, | |
1591 | struct dentry *old_dentry, | |
1592 | struct inode *new_dir, | |
1593 | struct dentry *new_dentry) | |
1594 | { | |
1595 | struct task_security_struct *tsec; | |
1596 | struct inode_security_struct *old_dsec, *new_dsec, *old_isec, *new_isec; | |
1597 | struct avc_audit_data ad; | |
1598 | u32 av; | |
1599 | int old_is_dir, new_is_dir; | |
1600 | int rc; | |
1601 | ||
b6dff3ec | 1602 | tsec = current->cred->security; |
1da177e4 LT |
1603 | old_dsec = old_dir->i_security; |
1604 | old_isec = old_dentry->d_inode->i_security; | |
1605 | old_is_dir = S_ISDIR(old_dentry->d_inode->i_mode); | |
1606 | new_dsec = new_dir->i_security; | |
1607 | ||
1608 | AVC_AUDIT_DATA_INIT(&ad, FS); | |
1609 | ||
44707fdf | 1610 | ad.u.fs.path.dentry = old_dentry; |
1da177e4 LT |
1611 | rc = avc_has_perm(tsec->sid, old_dsec->sid, SECCLASS_DIR, |
1612 | DIR__REMOVE_NAME | DIR__SEARCH, &ad); | |
1613 | if (rc) | |
1614 | return rc; | |
1615 | rc = avc_has_perm(tsec->sid, old_isec->sid, | |
1616 | old_isec->sclass, FILE__RENAME, &ad); | |
1617 | if (rc) | |
1618 | return rc; | |
1619 | if (old_is_dir && new_dir != old_dir) { | |
1620 | rc = avc_has_perm(tsec->sid, old_isec->sid, | |
1621 | old_isec->sclass, DIR__REPARENT, &ad); | |
1622 | if (rc) | |
1623 | return rc; | |
1624 | } | |
1625 | ||
44707fdf | 1626 | ad.u.fs.path.dentry = new_dentry; |
1da177e4 LT |
1627 | av = DIR__ADD_NAME | DIR__SEARCH; |
1628 | if (new_dentry->d_inode) | |
1629 | av |= DIR__REMOVE_NAME; | |
1630 | rc = avc_has_perm(tsec->sid, new_dsec->sid, SECCLASS_DIR, av, &ad); | |
1631 | if (rc) | |
1632 | return rc; | |
1633 | if (new_dentry->d_inode) { | |
1634 | new_isec = new_dentry->d_inode->i_security; | |
1635 | new_is_dir = S_ISDIR(new_dentry->d_inode->i_mode); | |
1636 | rc = avc_has_perm(tsec->sid, new_isec->sid, | |
1637 | new_isec->sclass, | |
1638 | (new_is_dir ? DIR__RMDIR : FILE__UNLINK), &ad); | |
1639 | if (rc) | |
1640 | return rc; | |
1641 | } | |
1642 | ||
1643 | return 0; | |
1644 | } | |
1645 | ||
1646 | /* Check whether a task can perform a filesystem operation. */ | |
1647 | static int superblock_has_perm(struct task_struct *tsk, | |
1648 | struct super_block *sb, | |
1649 | u32 perms, | |
1650 | struct avc_audit_data *ad) | |
1651 | { | |
1652 | struct task_security_struct *tsec; | |
1653 | struct superblock_security_struct *sbsec; | |
1654 | ||
b6dff3ec | 1655 | tsec = tsk->cred->security; |
1da177e4 LT |
1656 | sbsec = sb->s_security; |
1657 | return avc_has_perm(tsec->sid, sbsec->sid, SECCLASS_FILESYSTEM, | |
1658 | perms, ad); | |
1659 | } | |
1660 | ||
1661 | /* Convert a Linux mode and permission mask to an access vector. */ | |
1662 | static inline u32 file_mask_to_av(int mode, int mask) | |
1663 | { | |
1664 | u32 av = 0; | |
1665 | ||
1666 | if ((mode & S_IFMT) != S_IFDIR) { | |
1667 | if (mask & MAY_EXEC) | |
1668 | av |= FILE__EXECUTE; | |
1669 | if (mask & MAY_READ) | |
1670 | av |= FILE__READ; | |
1671 | ||
1672 | if (mask & MAY_APPEND) | |
1673 | av |= FILE__APPEND; | |
1674 | else if (mask & MAY_WRITE) | |
1675 | av |= FILE__WRITE; | |
1676 | ||
1677 | } else { | |
1678 | if (mask & MAY_EXEC) | |
1679 | av |= DIR__SEARCH; | |
1680 | if (mask & MAY_WRITE) | |
1681 | av |= DIR__WRITE; | |
1682 | if (mask & MAY_READ) | |
1683 | av |= DIR__READ; | |
1684 | } | |
1685 | ||
1686 | return av; | |
1687 | } | |
1688 | ||
8b6a5a37 EP |
1689 | /* Convert a Linux file to an access vector. */ |
1690 | static inline u32 file_to_av(struct file *file) | |
1691 | { | |
1692 | u32 av = 0; | |
1693 | ||
1694 | if (file->f_mode & FMODE_READ) | |
1695 | av |= FILE__READ; | |
1696 | if (file->f_mode & FMODE_WRITE) { | |
1697 | if (file->f_flags & O_APPEND) | |
1698 | av |= FILE__APPEND; | |
1699 | else | |
1700 | av |= FILE__WRITE; | |
1701 | } | |
1702 | if (!av) { | |
1703 | /* | |
1704 | * Special file opened with flags 3 for ioctl-only use. | |
1705 | */ | |
1706 | av = FILE__IOCTL; | |
1707 | } | |
1708 | ||
1709 | return av; | |
1710 | } | |
1711 | ||
b0c636b9 | 1712 | /* |
8b6a5a37 | 1713 | * Convert a file to an access vector and include the correct open |
b0c636b9 EP |
1714 | * open permission. |
1715 | */ | |
8b6a5a37 | 1716 | static inline u32 open_file_to_av(struct file *file) |
b0c636b9 | 1717 | { |
8b6a5a37 | 1718 | u32 av = file_to_av(file); |
b0c636b9 EP |
1719 | |
1720 | if (selinux_policycap_openperm) { | |
8b6a5a37 | 1721 | mode_t mode = file->f_path.dentry->d_inode->i_mode; |
b0c636b9 EP |
1722 | /* |
1723 | * lnk files and socks do not really have an 'open' | |
1724 | */ | |
1725 | if (S_ISREG(mode)) | |
1726 | av |= FILE__OPEN; | |
1727 | else if (S_ISCHR(mode)) | |
1728 | av |= CHR_FILE__OPEN; | |
1729 | else if (S_ISBLK(mode)) | |
1730 | av |= BLK_FILE__OPEN; | |
1731 | else if (S_ISFIFO(mode)) | |
1732 | av |= FIFO_FILE__OPEN; | |
1733 | else if (S_ISDIR(mode)) | |
1734 | av |= DIR__OPEN; | |
1735 | else | |
744ba35e | 1736 | printk(KERN_ERR "SELinux: WARNING: inside %s with " |
8b6a5a37 | 1737 | "unknown mode:%o\n", __func__, mode); |
b0c636b9 EP |
1738 | } |
1739 | return av; | |
1740 | } | |
1741 | ||
1da177e4 LT |
1742 | /* Hook functions begin here. */ |
1743 | ||
5cd9c58f DH |
1744 | static int selinux_ptrace_may_access(struct task_struct *child, |
1745 | unsigned int mode) | |
1da177e4 | 1746 | { |
1da177e4 LT |
1747 | int rc; |
1748 | ||
5cd9c58f | 1749 | rc = secondary_ops->ptrace_may_access(child, mode); |
1da177e4 LT |
1750 | if (rc) |
1751 | return rc; | |
1752 | ||
006ebb40 | 1753 | if (mode == PTRACE_MODE_READ) { |
b6dff3ec DH |
1754 | struct task_security_struct *tsec = current->cred->security; |
1755 | struct task_security_struct *csec = child->cred->security; | |
006ebb40 SS |
1756 | return avc_has_perm(tsec->sid, csec->sid, |
1757 | SECCLASS_FILE, FILE__READ, NULL); | |
1758 | } | |
1759 | ||
5cd9c58f DH |
1760 | return task_has_perm(current, child, PROCESS__PTRACE); |
1761 | } | |
1762 | ||
1763 | static int selinux_ptrace_traceme(struct task_struct *parent) | |
1764 | { | |
1765 | int rc; | |
1766 | ||
1767 | rc = secondary_ops->ptrace_traceme(parent); | |
1768 | if (rc) | |
1769 | return rc; | |
1770 | ||
1771 | return task_has_perm(parent, current, PROCESS__PTRACE); | |
1da177e4 LT |
1772 | } |
1773 | ||
1774 | static int selinux_capget(struct task_struct *target, kernel_cap_t *effective, | |
828dfe1d | 1775 | kernel_cap_t *inheritable, kernel_cap_t *permitted) |
1da177e4 LT |
1776 | { |
1777 | int error; | |
1778 | ||
1779 | error = task_has_perm(current, target, PROCESS__GETCAP); | |
1780 | if (error) | |
1781 | return error; | |
1782 | ||
1783 | return secondary_ops->capget(target, effective, inheritable, permitted); | |
1784 | } | |
1785 | ||
15a2460e DH |
1786 | static int selinux_capset_check(const kernel_cap_t *effective, |
1787 | const kernel_cap_t *inheritable, | |
1788 | const kernel_cap_t *permitted) | |
1da177e4 LT |
1789 | { |
1790 | int error; | |
1791 | ||
1cdcbec1 | 1792 | error = secondary_ops->capset_check(effective, inheritable, permitted); |
1da177e4 LT |
1793 | if (error) |
1794 | return error; | |
1795 | ||
1cdcbec1 | 1796 | return task_has_perm(current, current, PROCESS__SETCAP); |
1da177e4 LT |
1797 | } |
1798 | ||
15a2460e DH |
1799 | static void selinux_capset_set(const kernel_cap_t *effective, |
1800 | const kernel_cap_t *inheritable, | |
1801 | const kernel_cap_t *permitted) | |
1da177e4 | 1802 | { |
1cdcbec1 | 1803 | secondary_ops->capset_set(effective, inheritable, permitted); |
1da177e4 LT |
1804 | } |
1805 | ||
06112163 | 1806 | static int selinux_capable(struct task_struct *tsk, int cap, int audit) |
1da177e4 LT |
1807 | { |
1808 | int rc; | |
1809 | ||
06112163 | 1810 | rc = secondary_ops->capable(tsk, cap, audit); |
1da177e4 LT |
1811 | if (rc) |
1812 | return rc; | |
1813 | ||
06112163 | 1814 | return task_has_capability(tsk, cap, audit); |
1da177e4 LT |
1815 | } |
1816 | ||
3fbfa981 EB |
1817 | static int selinux_sysctl_get_sid(ctl_table *table, u16 tclass, u32 *sid) |
1818 | { | |
1819 | int buflen, rc; | |
1820 | char *buffer, *path, *end; | |
1821 | ||
1822 | rc = -ENOMEM; | |
828dfe1d | 1823 | buffer = (char *)__get_free_page(GFP_KERNEL); |
3fbfa981 EB |
1824 | if (!buffer) |
1825 | goto out; | |
1826 | ||
1827 | buflen = PAGE_SIZE; | |
1828 | end = buffer+buflen; | |
1829 | *--end = '\0'; | |
1830 | buflen--; | |
1831 | path = end-1; | |
1832 | *path = '/'; | |
1833 | while (table) { | |
1834 | const char *name = table->procname; | |
1835 | size_t namelen = strlen(name); | |
1836 | buflen -= namelen + 1; | |
1837 | if (buflen < 0) | |
1838 | goto out_free; | |
1839 | end -= namelen; | |
1840 | memcpy(end, name, namelen); | |
1841 | *--end = '/'; | |
1842 | path = end; | |
1843 | table = table->parent; | |
1844 | } | |
b599fdfd EB |
1845 | buflen -= 4; |
1846 | if (buflen < 0) | |
1847 | goto out_free; | |
1848 | end -= 4; | |
1849 | memcpy(end, "/sys", 4); | |
1850 | path = end; | |
3fbfa981 EB |
1851 | rc = security_genfs_sid("proc", path, tclass, sid); |
1852 | out_free: | |
1853 | free_page((unsigned long)buffer); | |
1854 | out: | |
1855 | return rc; | |
1856 | } | |
1857 | ||
1da177e4 LT |
1858 | static int selinux_sysctl(ctl_table *table, int op) |
1859 | { | |
1860 | int error = 0; | |
1861 | u32 av; | |
1862 | struct task_security_struct *tsec; | |
1863 | u32 tsid; | |
1864 | int rc; | |
1865 | ||
1866 | rc = secondary_ops->sysctl(table, op); | |
1867 | if (rc) | |
1868 | return rc; | |
1869 | ||
b6dff3ec | 1870 | tsec = current->cred->security; |
1da177e4 | 1871 | |
3fbfa981 EB |
1872 | rc = selinux_sysctl_get_sid(table, (op == 0001) ? |
1873 | SECCLASS_DIR : SECCLASS_FILE, &tsid); | |
1da177e4 LT |
1874 | if (rc) { |
1875 | /* Default to the well-defined sysctl SID. */ | |
1876 | tsid = SECINITSID_SYSCTL; | |
1877 | } | |
1878 | ||
1879 | /* The op values are "defined" in sysctl.c, thereby creating | |
1880 | * a bad coupling between this module and sysctl.c */ | |
828dfe1d | 1881 | if (op == 001) { |
1da177e4 LT |
1882 | error = avc_has_perm(tsec->sid, tsid, |
1883 | SECCLASS_DIR, DIR__SEARCH, NULL); | |
1884 | } else { | |
1885 | av = 0; | |
1886 | if (op & 004) | |
1887 | av |= FILE__READ; | |
1888 | if (op & 002) | |
1889 | av |= FILE__WRITE; | |
1890 | if (av) | |
1891 | error = avc_has_perm(tsec->sid, tsid, | |
1892 | SECCLASS_FILE, av, NULL); | |
828dfe1d | 1893 | } |
1da177e4 LT |
1894 | |
1895 | return error; | |
1896 | } | |
1897 | ||
1898 | static int selinux_quotactl(int cmds, int type, int id, struct super_block *sb) | |
1899 | { | |
1900 | int rc = 0; | |
1901 | ||
1902 | if (!sb) | |
1903 | return 0; | |
1904 | ||
1905 | switch (cmds) { | |
828dfe1d EP |
1906 | case Q_SYNC: |
1907 | case Q_QUOTAON: | |
1908 | case Q_QUOTAOFF: | |
1909 | case Q_SETINFO: | |
1910 | case Q_SETQUOTA: | |
1911 | rc = superblock_has_perm(current, sb, FILESYSTEM__QUOTAMOD, | |
1912 | NULL); | |
1913 | break; | |
1914 | case Q_GETFMT: | |
1915 | case Q_GETINFO: | |
1916 | case Q_GETQUOTA: | |
1917 | rc = superblock_has_perm(current, sb, FILESYSTEM__QUOTAGET, | |
1918 | NULL); | |
1919 | break; | |
1920 | default: | |
1921 | rc = 0; /* let the kernel handle invalid cmds */ | |
1922 | break; | |
1da177e4 LT |
1923 | } |
1924 | return rc; | |
1925 | } | |
1926 | ||
1927 | static int selinux_quota_on(struct dentry *dentry) | |
1928 | { | |
1929 | return dentry_has_perm(current, NULL, dentry, FILE__QUOTAON); | |
1930 | } | |
1931 | ||
1932 | static int selinux_syslog(int type) | |
1933 | { | |
1934 | int rc; | |
1935 | ||
1936 | rc = secondary_ops->syslog(type); | |
1937 | if (rc) | |
1938 | return rc; | |
1939 | ||
1940 | switch (type) { | |
828dfe1d EP |
1941 | case 3: /* Read last kernel messages */ |
1942 | case 10: /* Return size of the log buffer */ | |
1943 | rc = task_has_system(current, SYSTEM__SYSLOG_READ); | |
1944 | break; | |
1945 | case 6: /* Disable logging to console */ | |
1946 | case 7: /* Enable logging to console */ | |
1947 | case 8: /* Set level of messages printed to console */ | |
1948 | rc = task_has_system(current, SYSTEM__SYSLOG_CONSOLE); | |
1949 | break; | |
1950 | case 0: /* Close log */ | |
1951 | case 1: /* Open log */ | |
1952 | case 2: /* Read from log */ | |
1953 | case 4: /* Read/clear last kernel messages */ | |
1954 | case 5: /* Clear ring buffer */ | |
1955 | default: | |
1956 | rc = task_has_system(current, SYSTEM__SYSLOG_MOD); | |
1957 | break; | |
1da177e4 LT |
1958 | } |
1959 | return rc; | |
1960 | } | |
1961 | ||
1962 | /* | |
1963 | * Check that a process has enough memory to allocate a new virtual | |
1964 | * mapping. 0 means there is enough memory for the allocation to | |
1965 | * succeed and -ENOMEM implies there is not. | |
1966 | * | |
1967 | * Note that secondary_ops->capable and task_has_perm_noaudit return 0 | |
1968 | * if the capability is granted, but __vm_enough_memory requires 1 if | |
1969 | * the capability is granted. | |
1970 | * | |
1971 | * Do not audit the selinux permission check, as this is applied to all | |
1972 | * processes that allocate mappings. | |
1973 | */ | |
34b4e4aa | 1974 | static int selinux_vm_enough_memory(struct mm_struct *mm, long pages) |
1da177e4 LT |
1975 | { |
1976 | int rc, cap_sys_admin = 0; | |
1da177e4 | 1977 | |
06674679 | 1978 | rc = selinux_capable(current, CAP_SYS_ADMIN, SECURITY_CAP_NOAUDIT); |
1da177e4 LT |
1979 | if (rc == 0) |
1980 | cap_sys_admin = 1; | |
1981 | ||
34b4e4aa | 1982 | return __vm_enough_memory(mm, pages, cap_sys_admin); |
1da177e4 LT |
1983 | } |
1984 | ||
1985 | /* binprm security operations */ | |
1986 | ||
1987 | static int selinux_bprm_alloc_security(struct linux_binprm *bprm) | |
1988 | { | |
1989 | struct bprm_security_struct *bsec; | |
1990 | ||
89d155ef | 1991 | bsec = kzalloc(sizeof(struct bprm_security_struct), GFP_KERNEL); |
1da177e4 LT |
1992 | if (!bsec) |
1993 | return -ENOMEM; | |
1994 | ||
1da177e4 LT |
1995 | bsec->sid = SECINITSID_UNLABELED; |
1996 | bsec->set = 0; | |
1997 | ||
1998 | bprm->security = bsec; | |
1999 | return 0; | |
2000 | } | |
2001 | ||
2002 | static int selinux_bprm_set_security(struct linux_binprm *bprm) | |
2003 | { | |
2004 | struct task_security_struct *tsec; | |
3d5ff529 | 2005 | struct inode *inode = bprm->file->f_path.dentry->d_inode; |
1da177e4 LT |
2006 | struct inode_security_struct *isec; |
2007 | struct bprm_security_struct *bsec; | |
2008 | u32 newsid; | |
2009 | struct avc_audit_data ad; | |
2010 | int rc; | |
2011 | ||
2012 | rc = secondary_ops->bprm_set_security(bprm); | |
2013 | if (rc) | |
2014 | return rc; | |
2015 | ||
2016 | bsec = bprm->security; | |
2017 | ||
2018 | if (bsec->set) | |
2019 | return 0; | |
2020 | ||
b6dff3ec | 2021 | tsec = current->cred->security; |
1da177e4 LT |
2022 | isec = inode->i_security; |
2023 | ||
2024 | /* Default to the current task SID. */ | |
2025 | bsec->sid = tsec->sid; | |
2026 | ||
28eba5bf | 2027 | /* Reset fs, key, and sock SIDs on execve. */ |
1da177e4 | 2028 | tsec->create_sid = 0; |
28eba5bf | 2029 | tsec->keycreate_sid = 0; |
42c3e03e | 2030 | tsec->sockcreate_sid = 0; |
1da177e4 LT |
2031 | |
2032 | if (tsec->exec_sid) { | |
2033 | newsid = tsec->exec_sid; | |
2034 | /* Reset exec SID on execve. */ | |
2035 | tsec->exec_sid = 0; | |
2036 | } else { | |
2037 | /* Check for a default transition on this program. */ | |
2038 | rc = security_transition_sid(tsec->sid, isec->sid, | |
828dfe1d | 2039 | SECCLASS_PROCESS, &newsid); |
1da177e4 LT |
2040 | if (rc) |
2041 | return rc; | |
2042 | } | |
2043 | ||
2044 | AVC_AUDIT_DATA_INIT(&ad, FS); | |
44707fdf | 2045 | ad.u.fs.path = bprm->file->f_path; |
1da177e4 | 2046 | |
3d5ff529 | 2047 | if (bprm->file->f_path.mnt->mnt_flags & MNT_NOSUID) |
1da177e4 LT |
2048 | newsid = tsec->sid; |
2049 | ||
828dfe1d | 2050 | if (tsec->sid == newsid) { |
1da177e4 LT |
2051 | rc = avc_has_perm(tsec->sid, isec->sid, |
2052 | SECCLASS_FILE, FILE__EXECUTE_NO_TRANS, &ad); | |
2053 | if (rc) | |
2054 | return rc; | |
2055 | } else { | |
2056 | /* Check permissions for the transition. */ | |
2057 | rc = avc_has_perm(tsec->sid, newsid, | |
2058 | SECCLASS_PROCESS, PROCESS__TRANSITION, &ad); | |
2059 | if (rc) | |
2060 | return rc; | |
2061 | ||
2062 | rc = avc_has_perm(newsid, isec->sid, | |
2063 | SECCLASS_FILE, FILE__ENTRYPOINT, &ad); | |
2064 | if (rc) | |
2065 | return rc; | |
2066 | ||
2067 | /* Clear any possibly unsafe personality bits on exec: */ | |
2068 | current->personality &= ~PER_CLEAR_ON_SETID; | |
2069 | ||
2070 | /* Set the security field to the new SID. */ | |
2071 | bsec->sid = newsid; | |
2072 | } | |
2073 | ||
2074 | bsec->set = 1; | |
2075 | return 0; | |
2076 | } | |
2077 | ||
828dfe1d | 2078 | static int selinux_bprm_check_security(struct linux_binprm *bprm) |
1da177e4 LT |
2079 | { |
2080 | return secondary_ops->bprm_check_security(bprm); | |
2081 | } | |
2082 | ||
2083 | ||
828dfe1d | 2084 | static int selinux_bprm_secureexec(struct linux_binprm *bprm) |
1da177e4 | 2085 | { |
b6dff3ec | 2086 | struct task_security_struct *tsec = current->cred->security; |
1da177e4 LT |
2087 | int atsecure = 0; |
2088 | ||
2089 | if (tsec->osid != tsec->sid) { | |
2090 | /* Enable secure mode for SIDs transitions unless | |
2091 | the noatsecure permission is granted between | |
2092 | the two SIDs, i.e. ahp returns 0. */ | |
2093 | atsecure = avc_has_perm(tsec->osid, tsec->sid, | |
2094 | SECCLASS_PROCESS, | |
2095 | PROCESS__NOATSECURE, NULL); | |
2096 | } | |
2097 | ||
2098 | return (atsecure || secondary_ops->bprm_secureexec(bprm)); | |
2099 | } | |
2100 | ||
2101 | static void selinux_bprm_free_security(struct linux_binprm *bprm) | |
2102 | { | |
9a5f04bf | 2103 | kfree(bprm->security); |
1da177e4 | 2104 | bprm->security = NULL; |
1da177e4 LT |
2105 | } |
2106 | ||
2107 | extern struct vfsmount *selinuxfs_mount; | |
2108 | extern struct dentry *selinux_null; | |
2109 | ||
2110 | /* Derived from fs/exec.c:flush_old_files. */ | |
828dfe1d | 2111 | static inline void flush_unauthorized_files(struct files_struct *files) |
1da177e4 LT |
2112 | { |
2113 | struct avc_audit_data ad; | |
2114 | struct file *file, *devnull = NULL; | |
b20c8122 | 2115 | struct tty_struct *tty; |
badf1662 | 2116 | struct fdtable *fdt; |
1da177e4 | 2117 | long j = -1; |
24ec839c | 2118 | int drop_tty = 0; |
1da177e4 | 2119 | |
24ec839c | 2120 | tty = get_current_tty(); |
1da177e4 LT |
2121 | if (tty) { |
2122 | file_list_lock(); | |
37dd0bd0 EP |
2123 | if (!list_empty(&tty->tty_files)) { |
2124 | struct inode *inode; | |
2125 | ||
1da177e4 LT |
2126 | /* Revalidate access to controlling tty. |
2127 | Use inode_has_perm on the tty inode directly rather | |
2128 | than using file_has_perm, as this particular open | |
2129 | file may belong to another process and we are only | |
2130 | interested in the inode-based check here. */ | |
37dd0bd0 EP |
2131 | file = list_first_entry(&tty->tty_files, struct file, f_u.fu_list); |
2132 | inode = file->f_path.dentry->d_inode; | |
1da177e4 LT |
2133 | if (inode_has_perm(current, inode, |
2134 | FILE__READ | FILE__WRITE, NULL)) { | |
24ec839c | 2135 | drop_tty = 1; |
1da177e4 LT |
2136 | } |
2137 | } | |
2138 | file_list_unlock(); | |
452a00d2 | 2139 | tty_kref_put(tty); |
1da177e4 | 2140 | } |
98a27ba4 EB |
2141 | /* Reset controlling tty. */ |
2142 | if (drop_tty) | |
2143 | no_tty(); | |
1da177e4 LT |
2144 | |
2145 | /* Revalidate access to inherited open files. */ | |
2146 | ||
828dfe1d | 2147 | AVC_AUDIT_DATA_INIT(&ad, FS); |
1da177e4 LT |
2148 | |
2149 | spin_lock(&files->file_lock); | |
2150 | for (;;) { | |
2151 | unsigned long set, i; | |
2152 | int fd; | |
2153 | ||
2154 | j++; | |
2155 | i = j * __NFDBITS; | |
badf1662 | 2156 | fdt = files_fdtable(files); |
bbea9f69 | 2157 | if (i >= fdt->max_fds) |
1da177e4 | 2158 | break; |
badf1662 | 2159 | set = fdt->open_fds->fds_bits[j]; |
1da177e4 LT |
2160 | if (!set) |
2161 | continue; | |
2162 | spin_unlock(&files->file_lock); | |
828dfe1d | 2163 | for ( ; set ; i++, set >>= 1) { |
1da177e4 LT |
2164 | if (set & 1) { |
2165 | file = fget(i); | |
2166 | if (!file) | |
2167 | continue; | |
2168 | if (file_has_perm(current, | |
2169 | file, | |
2170 | file_to_av(file))) { | |
2171 | sys_close(i); | |
2172 | fd = get_unused_fd(); | |
2173 | if (fd != i) { | |
2174 | if (fd >= 0) | |
2175 | put_unused_fd(fd); | |
2176 | fput(file); | |
2177 | continue; | |
2178 | } | |
2179 | if (devnull) { | |
095975da | 2180 | get_file(devnull); |
1da177e4 LT |
2181 | } else { |
2182 | devnull = dentry_open(dget(selinux_null), mntget(selinuxfs_mount), O_RDWR); | |
fc5d81e6 AM |
2183 | if (IS_ERR(devnull)) { |
2184 | devnull = NULL; | |
1da177e4 LT |
2185 | put_unused_fd(fd); |
2186 | fput(file); | |
2187 | continue; | |
2188 | } | |
2189 | } | |
2190 | fd_install(fd, devnull); | |
2191 | } | |
2192 | fput(file); | |
2193 | } | |
2194 | } | |
2195 | spin_lock(&files->file_lock); | |
2196 | ||
2197 | } | |
2198 | spin_unlock(&files->file_lock); | |
2199 | } | |
2200 | ||
2201 | static void selinux_bprm_apply_creds(struct linux_binprm *bprm, int unsafe) | |
2202 | { | |
2203 | struct task_security_struct *tsec; | |
2204 | struct bprm_security_struct *bsec; | |
2205 | u32 sid; | |
2206 | int rc; | |
2207 | ||
2208 | secondary_ops->bprm_apply_creds(bprm, unsafe); | |
2209 | ||
b6dff3ec | 2210 | tsec = current->cred->security; |
1da177e4 LT |
2211 | |
2212 | bsec = bprm->security; | |
2213 | sid = bsec->sid; | |
2214 | ||
2215 | tsec->osid = tsec->sid; | |
2216 | bsec->unsafe = 0; | |
2217 | if (tsec->sid != sid) { | |
2218 | /* Check for shared state. If not ok, leave SID | |
2219 | unchanged and kill. */ | |
2220 | if (unsafe & LSM_UNSAFE_SHARE) { | |
2221 | rc = avc_has_perm(tsec->sid, sid, SECCLASS_PROCESS, | |
2222 | PROCESS__SHARE, NULL); | |
2223 | if (rc) { | |
2224 | bsec->unsafe = 1; | |
2225 | return; | |
2226 | } | |
2227 | } | |
2228 | ||
2229 | /* Check for ptracing, and update the task SID if ok. | |
2230 | Otherwise, leave SID unchanged and kill. */ | |
2231 | if (unsafe & (LSM_UNSAFE_PTRACE | LSM_UNSAFE_PTRACE_CAP)) { | |
0356357c RM |
2232 | struct task_struct *tracer; |
2233 | struct task_security_struct *sec; | |
2234 | u32 ptsid = 0; | |
2235 | ||
2236 | rcu_read_lock(); | |
0d094efe | 2237 | tracer = tracehook_tracer_task(current); |
0356357c | 2238 | if (likely(tracer != NULL)) { |
b6dff3ec | 2239 | sec = tracer->cred->security; |
0356357c RM |
2240 | ptsid = sec->sid; |
2241 | } | |
2242 | rcu_read_unlock(); | |
2243 | ||
2244 | if (ptsid != 0) { | |
2245 | rc = avc_has_perm(ptsid, sid, SECCLASS_PROCESS, | |
2246 | PROCESS__PTRACE, NULL); | |
2247 | if (rc) { | |
2248 | bsec->unsafe = 1; | |
2249 | return; | |
2250 | } | |
1da177e4 LT |
2251 | } |
2252 | } | |
2253 | tsec->sid = sid; | |
2254 | } | |
2255 | } | |
2256 | ||
2257 | /* | |
2258 | * called after apply_creds without the task lock held | |
2259 | */ | |
2260 | static void selinux_bprm_post_apply_creds(struct linux_binprm *bprm) | |
2261 | { | |
2262 | struct task_security_struct *tsec; | |
2263 | struct rlimit *rlim, *initrlim; | |
2264 | struct itimerval itimer; | |
2265 | struct bprm_security_struct *bsec; | |
41d9f9c5 | 2266 | struct sighand_struct *psig; |
1da177e4 | 2267 | int rc, i; |
41d9f9c5 | 2268 | unsigned long flags; |
1da177e4 | 2269 | |
b6dff3ec | 2270 | tsec = current->cred->security; |
1da177e4 LT |
2271 | bsec = bprm->security; |
2272 | ||
2273 | if (bsec->unsafe) { | |
2274 | force_sig_specific(SIGKILL, current); | |
2275 | return; | |
2276 | } | |
2277 | if (tsec->osid == tsec->sid) | |
2278 | return; | |
2279 | ||
2280 | /* Close files for which the new task SID is not authorized. */ | |
2281 | flush_unauthorized_files(current->files); | |
2282 | ||
2283 | /* Check whether the new SID can inherit signal state | |
2284 | from the old SID. If not, clear itimers to avoid | |
2285 | subsequent signal generation and flush and unblock | |
2286 | signals. This must occur _after_ the task SID has | |
2287 | been updated so that any kill done after the flush | |
2288 | will be checked against the new SID. */ | |
2289 | rc = avc_has_perm(tsec->osid, tsec->sid, SECCLASS_PROCESS, | |
2290 | PROCESS__SIGINH, NULL); | |
2291 | if (rc) { | |
2292 | memset(&itimer, 0, sizeof itimer); | |
2293 | for (i = 0; i < 3; i++) | |
2294 | do_setitimer(i, &itimer, NULL); | |
2295 | flush_signals(current); | |
2296 | spin_lock_irq(¤t->sighand->siglock); | |
2297 | flush_signal_handlers(current, 1); | |
2298 | sigemptyset(¤t->blocked); | |
2299 | recalc_sigpending(); | |
2300 | spin_unlock_irq(¤t->sighand->siglock); | |
2301 | } | |
2302 | ||
4ac212ad SS |
2303 | /* Always clear parent death signal on SID transitions. */ |
2304 | current->pdeath_signal = 0; | |
2305 | ||
1da177e4 LT |
2306 | /* Check whether the new SID can inherit resource limits |
2307 | from the old SID. If not, reset all soft limits to | |
2308 | the lower of the current task's hard limit and the init | |
2309 | task's soft limit. Note that the setting of hard limits | |
2310 | (even to lower them) can be controlled by the setrlimit | |
2311 | check. The inclusion of the init task's soft limit into | |
2312 | the computation is to avoid resetting soft limits higher | |
2313 | than the default soft limit for cases where the default | |
2314 | is lower than the hard limit, e.g. RLIMIT_CORE or | |
2315 | RLIMIT_STACK.*/ | |
2316 | rc = avc_has_perm(tsec->osid, tsec->sid, SECCLASS_PROCESS, | |
2317 | PROCESS__RLIMITINH, NULL); | |
2318 | if (rc) { | |
2319 | for (i = 0; i < RLIM_NLIMITS; i++) { | |
2320 | rlim = current->signal->rlim + i; | |
2321 | initrlim = init_task.signal->rlim+i; | |
828dfe1d | 2322 | rlim->rlim_cur = min(rlim->rlim_max, initrlim->rlim_cur); |
1da177e4 | 2323 | } |
f06febc9 | 2324 | update_rlimit_cpu(rlim->rlim_cur); |
1da177e4 LT |
2325 | } |
2326 | ||
2327 | /* Wake up the parent if it is waiting so that it can | |
2328 | recheck wait permission to the new task SID. */ | |
41d9f9c5 EP |
2329 | read_lock_irq(&tasklist_lock); |
2330 | psig = current->parent->sighand; | |
2331 | spin_lock_irqsave(&psig->siglock, flags); | |
1da177e4 | 2332 | wake_up_interruptible(¤t->parent->signal->wait_chldexit); |
41d9f9c5 EP |
2333 | spin_unlock_irqrestore(&psig->siglock, flags); |
2334 | read_unlock_irq(&tasklist_lock); | |
1da177e4 LT |
2335 | } |
2336 | ||
2337 | /* superblock security operations */ | |
2338 | ||
2339 | static int selinux_sb_alloc_security(struct super_block *sb) | |
2340 | { | |
2341 | return superblock_alloc_security(sb); | |
2342 | } | |
2343 | ||
2344 | static void selinux_sb_free_security(struct super_block *sb) | |
2345 | { | |
2346 | superblock_free_security(sb); | |
2347 | } | |
2348 | ||
2349 | static inline int match_prefix(char *prefix, int plen, char *option, int olen) | |
2350 | { | |
2351 | if (plen > olen) | |
2352 | return 0; | |
2353 | ||
2354 | return !memcmp(prefix, option, plen); | |
2355 | } | |
2356 | ||
2357 | static inline int selinux_option(char *option, int len) | |
2358 | { | |
832cbd9a EP |
2359 | return (match_prefix(CONTEXT_STR, sizeof(CONTEXT_STR)-1, option, len) || |
2360 | match_prefix(FSCONTEXT_STR, sizeof(FSCONTEXT_STR)-1, option, len) || | |
2361 | match_prefix(DEFCONTEXT_STR, sizeof(DEFCONTEXT_STR)-1, option, len) || | |
2362 | match_prefix(ROOTCONTEXT_STR, sizeof(ROOTCONTEXT_STR)-1, option, len)); | |
1da177e4 LT |
2363 | } |
2364 | ||
2365 | static inline void take_option(char **to, char *from, int *first, int len) | |
2366 | { | |
2367 | if (!*first) { | |
2368 | **to = ','; | |
2369 | *to += 1; | |
3528a953 | 2370 | } else |
1da177e4 LT |
2371 | *first = 0; |
2372 | memcpy(*to, from, len); | |
2373 | *to += len; | |
2374 | } | |
2375 | ||
828dfe1d EP |
2376 | static inline void take_selinux_option(char **to, char *from, int *first, |
2377 | int len) | |
3528a953 CO |
2378 | { |
2379 | int current_size = 0; | |
2380 | ||
2381 | if (!*first) { | |
2382 | **to = '|'; | |
2383 | *to += 1; | |
828dfe1d | 2384 | } else |
3528a953 CO |
2385 | *first = 0; |
2386 | ||
2387 | while (current_size < len) { | |
2388 | if (*from != '"') { | |
2389 | **to = *from; | |
2390 | *to += 1; | |
2391 | } | |
2392 | from += 1; | |
2393 | current_size += 1; | |
2394 | } | |
2395 | } | |
2396 | ||
e0007529 | 2397 | static int selinux_sb_copy_data(char *orig, char *copy) |
1da177e4 LT |
2398 | { |
2399 | int fnosec, fsec, rc = 0; | |
2400 | char *in_save, *in_curr, *in_end; | |
2401 | char *sec_curr, *nosec_save, *nosec; | |
3528a953 | 2402 | int open_quote = 0; |
1da177e4 LT |
2403 | |
2404 | in_curr = orig; | |
2405 | sec_curr = copy; | |
2406 | ||
1da177e4 LT |
2407 | nosec = (char *)get_zeroed_page(GFP_KERNEL); |
2408 | if (!nosec) { | |
2409 | rc = -ENOMEM; | |
2410 | goto out; | |
2411 | } | |
2412 | ||
2413 | nosec_save = nosec; | |
2414 | fnosec = fsec = 1; | |
2415 | in_save = in_end = orig; | |
2416 | ||
2417 | do { | |
3528a953 CO |
2418 | if (*in_end == '"') |
2419 | open_quote = !open_quote; | |
2420 | if ((*in_end == ',' && open_quote == 0) || | |
2421 | *in_end == '\0') { | |
1da177e4 LT |
2422 | int len = in_end - in_curr; |
2423 | ||
2424 | if (selinux_option(in_curr, len)) | |
3528a953 | 2425 | take_selinux_option(&sec_curr, in_curr, &fsec, len); |
1da177e4 LT |
2426 | else |
2427 | take_option(&nosec, in_curr, &fnosec, len); | |
2428 | ||
2429 | in_curr = in_end + 1; | |
2430 | } | |
2431 | } while (*in_end++); | |
2432 | ||
6931dfc9 | 2433 | strcpy(in_save, nosec_save); |
da3caa20 | 2434 | free_page((unsigned long)nosec_save); |
1da177e4 LT |
2435 | out: |
2436 | return rc; | |
2437 | } | |
2438 | ||
2439 | static int selinux_sb_kern_mount(struct super_block *sb, void *data) | |
2440 | { | |
2441 | struct avc_audit_data ad; | |
2442 | int rc; | |
2443 | ||
2444 | rc = superblock_doinit(sb, data); | |
2445 | if (rc) | |
2446 | return rc; | |
2447 | ||
828dfe1d | 2448 | AVC_AUDIT_DATA_INIT(&ad, FS); |
44707fdf | 2449 | ad.u.fs.path.dentry = sb->s_root; |
1da177e4 LT |
2450 | return superblock_has_perm(current, sb, FILESYSTEM__MOUNT, &ad); |
2451 | } | |
2452 | ||
726c3342 | 2453 | static int selinux_sb_statfs(struct dentry *dentry) |
1da177e4 LT |
2454 | { |
2455 | struct avc_audit_data ad; | |
2456 | ||
828dfe1d | 2457 | AVC_AUDIT_DATA_INIT(&ad, FS); |
44707fdf | 2458 | ad.u.fs.path.dentry = dentry->d_sb->s_root; |
726c3342 | 2459 | return superblock_has_perm(current, dentry->d_sb, FILESYSTEM__GETATTR, &ad); |
1da177e4 LT |
2460 | } |
2461 | ||
828dfe1d | 2462 | static int selinux_mount(char *dev_name, |
b5266eb4 | 2463 | struct path *path, |
828dfe1d EP |
2464 | char *type, |
2465 | unsigned long flags, | |
2466 | void *data) | |
1da177e4 LT |
2467 | { |
2468 | int rc; | |
2469 | ||
b5266eb4 | 2470 | rc = secondary_ops->sb_mount(dev_name, path, type, flags, data); |
1da177e4 LT |
2471 | if (rc) |
2472 | return rc; | |
2473 | ||
2474 | if (flags & MS_REMOUNT) | |
b5266eb4 | 2475 | return superblock_has_perm(current, path->mnt->mnt_sb, |
828dfe1d | 2476 | FILESYSTEM__REMOUNT, NULL); |
1da177e4 | 2477 | else |
b5266eb4 | 2478 | return dentry_has_perm(current, path->mnt, path->dentry, |
828dfe1d | 2479 | FILE__MOUNTON); |
1da177e4 LT |
2480 | } |
2481 | ||
2482 | static int selinux_umount(struct vfsmount *mnt, int flags) | |
2483 | { | |
2484 | int rc; | |
2485 | ||
2486 | rc = secondary_ops->sb_umount(mnt, flags); | |
2487 | if (rc) | |
2488 | return rc; | |
2489 | ||
828dfe1d EP |
2490 | return superblock_has_perm(current, mnt->mnt_sb, |
2491 | FILESYSTEM__UNMOUNT, NULL); | |
1da177e4 LT |
2492 | } |
2493 | ||
2494 | /* inode security operations */ | |
2495 | ||
2496 | static int selinux_inode_alloc_security(struct inode *inode) | |
2497 | { | |
2498 | return inode_alloc_security(inode); | |
2499 | } | |
2500 | ||
2501 | static void selinux_inode_free_security(struct inode *inode) | |
2502 | { | |
2503 | inode_free_security(inode); | |
2504 | } | |
2505 | ||
5e41ff9e SS |
2506 | static int selinux_inode_init_security(struct inode *inode, struct inode *dir, |
2507 | char **name, void **value, | |
2508 | size_t *len) | |
2509 | { | |
2510 | struct task_security_struct *tsec; | |
2511 | struct inode_security_struct *dsec; | |
2512 | struct superblock_security_struct *sbsec; | |
570bc1c2 | 2513 | u32 newsid, clen; |
5e41ff9e | 2514 | int rc; |
570bc1c2 | 2515 | char *namep = NULL, *context; |
5e41ff9e | 2516 | |
b6dff3ec | 2517 | tsec = current->cred->security; |
5e41ff9e SS |
2518 | dsec = dir->i_security; |
2519 | sbsec = dir->i_sb->s_security; | |
5e41ff9e SS |
2520 | |
2521 | if (tsec->create_sid && sbsec->behavior != SECURITY_FS_USE_MNTPOINT) { | |
2522 | newsid = tsec->create_sid; | |
2523 | } else { | |
2524 | rc = security_transition_sid(tsec->sid, dsec->sid, | |
2525 | inode_mode_to_security_class(inode->i_mode), | |
2526 | &newsid); | |
2527 | if (rc) { | |
2528 | printk(KERN_WARNING "%s: " | |
2529 | "security_transition_sid failed, rc=%d (dev=%s " | |
2530 | "ino=%ld)\n", | |
dd6f953a | 2531 | __func__, |
5e41ff9e SS |
2532 | -rc, inode->i_sb->s_id, inode->i_ino); |
2533 | return rc; | |
2534 | } | |
2535 | } | |
2536 | ||
296fddf7 EP |
2537 | /* Possibly defer initialization to selinux_complete_init. */ |
2538 | if (sbsec->initialized) { | |
2539 | struct inode_security_struct *isec = inode->i_security; | |
2540 | isec->sclass = inode_mode_to_security_class(inode->i_mode); | |
2541 | isec->sid = newsid; | |
2542 | isec->initialized = 1; | |
2543 | } | |
5e41ff9e | 2544 | |
8aad3875 | 2545 | if (!ss_initialized || sbsec->behavior == SECURITY_FS_USE_MNTPOINT) |
25a74f3b SS |
2546 | return -EOPNOTSUPP; |
2547 | ||
570bc1c2 | 2548 | if (name) { |
a02fe132 | 2549 | namep = kstrdup(XATTR_SELINUX_SUFFIX, GFP_NOFS); |
570bc1c2 SS |
2550 | if (!namep) |
2551 | return -ENOMEM; | |
2552 | *name = namep; | |
2553 | } | |
5e41ff9e | 2554 | |
570bc1c2 | 2555 | if (value && len) { |
12b29f34 | 2556 | rc = security_sid_to_context_force(newsid, &context, &clen); |
570bc1c2 SS |
2557 | if (rc) { |
2558 | kfree(namep); | |
2559 | return rc; | |
2560 | } | |
2561 | *value = context; | |
2562 | *len = clen; | |
5e41ff9e | 2563 | } |
5e41ff9e | 2564 | |
5e41ff9e SS |
2565 | return 0; |
2566 | } | |
2567 | ||
1da177e4 LT |
2568 | static int selinux_inode_create(struct inode *dir, struct dentry *dentry, int mask) |
2569 | { | |
2570 | return may_create(dir, dentry, SECCLASS_FILE); | |
2571 | } | |
2572 | ||
1da177e4 LT |
2573 | static int selinux_inode_link(struct dentry *old_dentry, struct inode *dir, struct dentry *new_dentry) |
2574 | { | |
2575 | int rc; | |
2576 | ||
828dfe1d | 2577 | rc = secondary_ops->inode_link(old_dentry, dir, new_dentry); |
1da177e4 LT |
2578 | if (rc) |
2579 | return rc; | |
2580 | return may_link(dir, old_dentry, MAY_LINK); | |
2581 | } | |
2582 | ||
1da177e4 LT |
2583 | static int selinux_inode_unlink(struct inode *dir, struct dentry *dentry) |
2584 | { | |
2585 | int rc; | |
2586 | ||
2587 | rc = secondary_ops->inode_unlink(dir, dentry); | |
2588 | if (rc) | |
2589 | return rc; | |
2590 | return may_link(dir, dentry, MAY_UNLINK); | |
2591 | } | |
2592 | ||
2593 | static int selinux_inode_symlink(struct inode *dir, struct dentry *dentry, const char *name) | |
2594 | { | |
2595 | return may_create(dir, dentry, SECCLASS_LNK_FILE); | |
2596 | } | |
2597 | ||
1da177e4 LT |
2598 | static int selinux_inode_mkdir(struct inode *dir, struct dentry *dentry, int mask) |
2599 | { | |
2600 | return may_create(dir, dentry, SECCLASS_DIR); | |
2601 | } | |
2602 | ||
1da177e4 LT |
2603 | static int selinux_inode_rmdir(struct inode *dir, struct dentry *dentry) |
2604 | { | |
2605 | return may_link(dir, dentry, MAY_RMDIR); | |
2606 | } | |
2607 | ||
2608 | static int selinux_inode_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev) | |
2609 | { | |
2610 | int rc; | |
2611 | ||
2612 | rc = secondary_ops->inode_mknod(dir, dentry, mode, dev); | |
2613 | if (rc) | |
2614 | return rc; | |
2615 | ||
2616 | return may_create(dir, dentry, inode_mode_to_security_class(mode)); | |
2617 | } | |
2618 | ||
1da177e4 | 2619 | static int selinux_inode_rename(struct inode *old_inode, struct dentry *old_dentry, |
828dfe1d | 2620 | struct inode *new_inode, struct dentry *new_dentry) |
1da177e4 LT |
2621 | { |
2622 | return may_rename(old_inode, old_dentry, new_inode, new_dentry); | |
2623 | } | |
2624 | ||
1da177e4 LT |
2625 | static int selinux_inode_readlink(struct dentry *dentry) |
2626 | { | |
2627 | return dentry_has_perm(current, NULL, dentry, FILE__READ); | |
2628 | } | |
2629 | ||
2630 | static int selinux_inode_follow_link(struct dentry *dentry, struct nameidata *nameidata) | |
2631 | { | |
2632 | int rc; | |
2633 | ||
828dfe1d | 2634 | rc = secondary_ops->inode_follow_link(dentry, nameidata); |
1da177e4 LT |
2635 | if (rc) |
2636 | return rc; | |
2637 | return dentry_has_perm(current, NULL, dentry, FILE__READ); | |
2638 | } | |
2639 | ||
b77b0646 | 2640 | static int selinux_inode_permission(struct inode *inode, int mask) |
1da177e4 LT |
2641 | { |
2642 | int rc; | |
2643 | ||
b77b0646 | 2644 | rc = secondary_ops->inode_permission(inode, mask); |
1da177e4 LT |
2645 | if (rc) |
2646 | return rc; | |
2647 | ||
2648 | if (!mask) { | |
2649 | /* No permission to check. Existence test. */ | |
2650 | return 0; | |
2651 | } | |
2652 | ||
2653 | return inode_has_perm(current, inode, | |
8b6a5a37 | 2654 | file_mask_to_av(inode->i_mode, mask), NULL); |
1da177e4 LT |
2655 | } |
2656 | ||
2657 | static int selinux_inode_setattr(struct dentry *dentry, struct iattr *iattr) | |
2658 | { | |
2659 | int rc; | |
2660 | ||
2661 | rc = secondary_ops->inode_setattr(dentry, iattr); | |
2662 | if (rc) | |
2663 | return rc; | |
2664 | ||
2665 | if (iattr->ia_valid & ATTR_FORCE) | |
2666 | return 0; | |
2667 | ||
2668 | if (iattr->ia_valid & (ATTR_MODE | ATTR_UID | ATTR_GID | | |
2669 | ATTR_ATIME_SET | ATTR_MTIME_SET)) | |
2670 | return dentry_has_perm(current, NULL, dentry, FILE__SETATTR); | |
2671 | ||
2672 | return dentry_has_perm(current, NULL, dentry, FILE__WRITE); | |
2673 | } | |
2674 | ||
2675 | static int selinux_inode_getattr(struct vfsmount *mnt, struct dentry *dentry) | |
2676 | { | |
2677 | return dentry_has_perm(current, mnt, dentry, FILE__GETATTR); | |
2678 | } | |
2679 | ||
8f0cfa52 | 2680 | static int selinux_inode_setotherxattr(struct dentry *dentry, const char *name) |
b5376771 SH |
2681 | { |
2682 | if (!strncmp(name, XATTR_SECURITY_PREFIX, | |
2683 | sizeof XATTR_SECURITY_PREFIX - 1)) { | |
2684 | if (!strcmp(name, XATTR_NAME_CAPS)) { | |
2685 | if (!capable(CAP_SETFCAP)) | |
2686 | return -EPERM; | |
2687 | } else if (!capable(CAP_SYS_ADMIN)) { | |
2688 | /* A different attribute in the security namespace. | |
2689 | Restrict to administrator. */ | |
2690 | return -EPERM; | |
2691 | } | |
2692 | } | |
2693 | ||
2694 | /* Not an attribute we recognize, so just check the | |
2695 | ordinary setattr permission. */ | |
2696 | return dentry_has_perm(current, NULL, dentry, FILE__SETATTR); | |
2697 | } | |
2698 | ||
8f0cfa52 DH |
2699 | static int selinux_inode_setxattr(struct dentry *dentry, const char *name, |
2700 | const void *value, size_t size, int flags) | |
1da177e4 | 2701 | { |
b6dff3ec | 2702 | struct task_security_struct *tsec = current->cred->security; |
1da177e4 LT |
2703 | struct inode *inode = dentry->d_inode; |
2704 | struct inode_security_struct *isec = inode->i_security; | |
2705 | struct superblock_security_struct *sbsec; | |
2706 | struct avc_audit_data ad; | |
2707 | u32 newsid; | |
2708 | int rc = 0; | |
2709 | ||
b5376771 SH |
2710 | if (strcmp(name, XATTR_NAME_SELINUX)) |
2711 | return selinux_inode_setotherxattr(dentry, name); | |
1da177e4 LT |
2712 | |
2713 | sbsec = inode->i_sb->s_security; | |
2714 | if (sbsec->behavior == SECURITY_FS_USE_MNTPOINT) | |
2715 | return -EOPNOTSUPP; | |
2716 | ||
3bd858ab | 2717 | if (!is_owner_or_cap(inode)) |
1da177e4 LT |
2718 | return -EPERM; |
2719 | ||
828dfe1d | 2720 | AVC_AUDIT_DATA_INIT(&ad, FS); |
44707fdf | 2721 | ad.u.fs.path.dentry = dentry; |
1da177e4 LT |
2722 | |
2723 | rc = avc_has_perm(tsec->sid, isec->sid, isec->sclass, | |
2724 | FILE__RELABELFROM, &ad); | |
2725 | if (rc) | |
2726 | return rc; | |
2727 | ||
2728 | rc = security_context_to_sid(value, size, &newsid); | |
12b29f34 SS |
2729 | if (rc == -EINVAL) { |
2730 | if (!capable(CAP_MAC_ADMIN)) | |
2731 | return rc; | |
2732 | rc = security_context_to_sid_force(value, size, &newsid); | |
2733 | } | |
1da177e4 LT |
2734 | if (rc) |
2735 | return rc; | |
2736 | ||
2737 | rc = avc_has_perm(tsec->sid, newsid, isec->sclass, | |
2738 | FILE__RELABELTO, &ad); | |
2739 | if (rc) | |
2740 | return rc; | |
2741 | ||
2742 | rc = security_validate_transition(isec->sid, newsid, tsec->sid, | |
828dfe1d | 2743 | isec->sclass); |
1da177e4 LT |
2744 | if (rc) |
2745 | return rc; | |
2746 | ||
2747 | return avc_has_perm(newsid, | |
2748 | sbsec->sid, | |
2749 | SECCLASS_FILESYSTEM, | |
2750 | FILESYSTEM__ASSOCIATE, | |
2751 | &ad); | |
2752 | } | |
2753 | ||
8f0cfa52 | 2754 | static void selinux_inode_post_setxattr(struct dentry *dentry, const char *name, |
f5269710 | 2755 | const void *value, size_t size, |
8f0cfa52 | 2756 | int flags) |
1da177e4 LT |
2757 | { |
2758 | struct inode *inode = dentry->d_inode; | |
2759 | struct inode_security_struct *isec = inode->i_security; | |
2760 | u32 newsid; | |
2761 | int rc; | |
2762 | ||
2763 | if (strcmp(name, XATTR_NAME_SELINUX)) { | |
2764 | /* Not an attribute we recognize, so nothing to do. */ | |
2765 | return; | |
2766 | } | |
2767 | ||
12b29f34 | 2768 | rc = security_context_to_sid_force(value, size, &newsid); |
1da177e4 | 2769 | if (rc) { |
12b29f34 SS |
2770 | printk(KERN_ERR "SELinux: unable to map context to SID" |
2771 | "for (%s, %lu), rc=%d\n", | |
2772 | inode->i_sb->s_id, inode->i_ino, -rc); | |
1da177e4 LT |
2773 | return; |
2774 | } | |
2775 | ||
2776 | isec->sid = newsid; | |
2777 | return; | |
2778 | } | |
2779 | ||
8f0cfa52 | 2780 | static int selinux_inode_getxattr(struct dentry *dentry, const char *name) |
1da177e4 | 2781 | { |
1da177e4 LT |
2782 | return dentry_has_perm(current, NULL, dentry, FILE__GETATTR); |
2783 | } | |
2784 | ||
828dfe1d | 2785 | static int selinux_inode_listxattr(struct dentry *dentry) |
1da177e4 LT |
2786 | { |
2787 | return dentry_has_perm(current, NULL, dentry, FILE__GETATTR); | |
2788 | } | |
2789 | ||
8f0cfa52 | 2790 | static int selinux_inode_removexattr(struct dentry *dentry, const char *name) |
1da177e4 | 2791 | { |
b5376771 SH |
2792 | if (strcmp(name, XATTR_NAME_SELINUX)) |
2793 | return selinux_inode_setotherxattr(dentry, name); | |
1da177e4 LT |
2794 | |
2795 | /* No one is allowed to remove a SELinux security label. | |
2796 | You can change the label, but all data must be labeled. */ | |
2797 | return -EACCES; | |
2798 | } | |
2799 | ||
d381d8a9 | 2800 | /* |
abc69bb6 | 2801 | * Copy the inode security context value to the user. |
d381d8a9 JM |
2802 | * |
2803 | * Permission check is handled by selinux_inode_getxattr hook. | |
2804 | */ | |
42492594 | 2805 | static int selinux_inode_getsecurity(const struct inode *inode, const char *name, void **buffer, bool alloc) |
1da177e4 | 2806 | { |
42492594 DQ |
2807 | u32 size; |
2808 | int error; | |
2809 | char *context = NULL; | |
1da177e4 | 2810 | struct inode_security_struct *isec = inode->i_security; |
d381d8a9 | 2811 | |
8c8570fb DK |
2812 | if (strcmp(name, XATTR_SELINUX_SUFFIX)) |
2813 | return -EOPNOTSUPP; | |
d381d8a9 | 2814 | |
abc69bb6 SS |
2815 | /* |
2816 | * If the caller has CAP_MAC_ADMIN, then get the raw context | |
2817 | * value even if it is not defined by current policy; otherwise, | |
2818 | * use the in-core value under current policy. | |
2819 | * Use the non-auditing forms of the permission checks since | |
2820 | * getxattr may be called by unprivileged processes commonly | |
2821 | * and lack of permission just means that we fall back to the | |
2822 | * in-core context value, not a denial. | |
2823 | */ | |
06674679 | 2824 | error = selinux_capable(current, CAP_MAC_ADMIN, SECURITY_CAP_NOAUDIT); |
abc69bb6 SS |
2825 | if (!error) |
2826 | error = security_sid_to_context_force(isec->sid, &context, | |
2827 | &size); | |
2828 | else | |
2829 | error = security_sid_to_context(isec->sid, &context, &size); | |
42492594 DQ |
2830 | if (error) |
2831 | return error; | |
2832 | error = size; | |
2833 | if (alloc) { | |
2834 | *buffer = context; | |
2835 | goto out_nofree; | |
2836 | } | |
2837 | kfree(context); | |
2838 | out_nofree: | |
2839 | return error; | |
1da177e4 LT |
2840 | } |
2841 | ||
2842 | static int selinux_inode_setsecurity(struct inode *inode, const char *name, | |
828dfe1d | 2843 | const void *value, size_t size, int flags) |
1da177e4 LT |
2844 | { |
2845 | struct inode_security_struct *isec = inode->i_security; | |
2846 | u32 newsid; | |
2847 | int rc; | |
2848 | ||
2849 | if (strcmp(name, XATTR_SELINUX_SUFFIX)) | |
2850 | return -EOPNOTSUPP; | |
2851 | ||
2852 | if (!value || !size) | |
2853 | return -EACCES; | |
2854 | ||
828dfe1d | 2855 | rc = security_context_to_sid((void *)value, size, &newsid); |
1da177e4 LT |
2856 | if (rc) |
2857 | return rc; | |
2858 | ||
2859 | isec->sid = newsid; | |
2860 | return 0; | |
2861 | } | |
2862 | ||
2863 | static int selinux_inode_listsecurity(struct inode *inode, char *buffer, size_t buffer_size) | |
2864 | { | |
2865 | const int len = sizeof(XATTR_NAME_SELINUX); | |
2866 | if (buffer && len <= buffer_size) | |
2867 | memcpy(buffer, XATTR_NAME_SELINUX, len); | |
2868 | return len; | |
2869 | } | |
2870 | ||
b5376771 SH |
2871 | static int selinux_inode_need_killpriv(struct dentry *dentry) |
2872 | { | |
2873 | return secondary_ops->inode_need_killpriv(dentry); | |
2874 | } | |
2875 | ||
2876 | static int selinux_inode_killpriv(struct dentry *dentry) | |
2877 | { | |
2878 | return secondary_ops->inode_killpriv(dentry); | |
2879 | } | |
2880 | ||
713a04ae AD |
2881 | static void selinux_inode_getsecid(const struct inode *inode, u32 *secid) |
2882 | { | |
2883 | struct inode_security_struct *isec = inode->i_security; | |
2884 | *secid = isec->sid; | |
2885 | } | |
2886 | ||
1da177e4 LT |
2887 | /* file security operations */ |
2888 | ||
788e7dd4 | 2889 | static int selinux_revalidate_file_permission(struct file *file, int mask) |
1da177e4 | 2890 | { |
7420ed23 | 2891 | int rc; |
3d5ff529 | 2892 | struct inode *inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
2893 | |
2894 | if (!mask) { | |
2895 | /* No permission to check. Existence test. */ | |
2896 | return 0; | |
2897 | } | |
2898 | ||
2899 | /* file_mask_to_av won't add FILE__WRITE if MAY_APPEND is set */ | |
2900 | if ((file->f_flags & O_APPEND) && (mask & MAY_WRITE)) | |
2901 | mask |= MAY_APPEND; | |
2902 | ||
7420ed23 VY |
2903 | rc = file_has_perm(current, file, |
2904 | file_mask_to_av(inode->i_mode, mask)); | |
2905 | if (rc) | |
2906 | return rc; | |
2907 | ||
2908 | return selinux_netlbl_inode_permission(inode, mask); | |
1da177e4 LT |
2909 | } |
2910 | ||
788e7dd4 YN |
2911 | static int selinux_file_permission(struct file *file, int mask) |
2912 | { | |
2913 | struct inode *inode = file->f_path.dentry->d_inode; | |
b6dff3ec | 2914 | struct task_security_struct *tsec = current->cred->security; |
788e7dd4 YN |
2915 | struct file_security_struct *fsec = file->f_security; |
2916 | struct inode_security_struct *isec = inode->i_security; | |
2917 | ||
2918 | if (!mask) { | |
2919 | /* No permission to check. Existence test. */ | |
2920 | return 0; | |
2921 | } | |
2922 | ||
2923 | if (tsec->sid == fsec->sid && fsec->isid == isec->sid | |
2924 | && fsec->pseqno == avc_policy_seqno()) | |
2925 | return selinux_netlbl_inode_permission(inode, mask); | |
2926 | ||
2927 | return selinux_revalidate_file_permission(file, mask); | |
2928 | } | |
2929 | ||
1da177e4 LT |
2930 | static int selinux_file_alloc_security(struct file *file) |
2931 | { | |
2932 | return file_alloc_security(file); | |
2933 | } | |
2934 | ||
2935 | static void selinux_file_free_security(struct file *file) | |
2936 | { | |
2937 | file_free_security(file); | |
2938 | } | |
2939 | ||
2940 | static int selinux_file_ioctl(struct file *file, unsigned int cmd, | |
2941 | unsigned long arg) | |
2942 | { | |
242631c4 | 2943 | u32 av = 0; |
1da177e4 | 2944 | |
242631c4 SS |
2945 | if (_IOC_DIR(cmd) & _IOC_WRITE) |
2946 | av |= FILE__WRITE; | |
2947 | if (_IOC_DIR(cmd) & _IOC_READ) | |
2948 | av |= FILE__READ; | |
2949 | if (!av) | |
2950 | av = FILE__IOCTL; | |
1da177e4 | 2951 | |
242631c4 | 2952 | return file_has_perm(current, file, av); |
1da177e4 LT |
2953 | } |
2954 | ||
2955 | static int file_map_prot_check(struct file *file, unsigned long prot, int shared) | |
2956 | { | |
2957 | #ifndef CONFIG_PPC32 | |
2958 | if ((prot & PROT_EXEC) && (!file || (!shared && (prot & PROT_WRITE)))) { | |
2959 | /* | |
2960 | * We are making executable an anonymous mapping or a | |
2961 | * private file mapping that will also be writable. | |
2962 | * This has an additional check. | |
2963 | */ | |
2964 | int rc = task_has_perm(current, current, PROCESS__EXECMEM); | |
2965 | if (rc) | |
2966 | return rc; | |
2967 | } | |
2968 | #endif | |
2969 | ||
2970 | if (file) { | |
2971 | /* read access is always possible with a mapping */ | |
2972 | u32 av = FILE__READ; | |
2973 | ||
2974 | /* write access only matters if the mapping is shared */ | |
2975 | if (shared && (prot & PROT_WRITE)) | |
2976 | av |= FILE__WRITE; | |
2977 | ||
2978 | if (prot & PROT_EXEC) | |
2979 | av |= FILE__EXECUTE; | |
2980 | ||
2981 | return file_has_perm(current, file, av); | |
2982 | } | |
2983 | return 0; | |
2984 | } | |
2985 | ||
2986 | static int selinux_file_mmap(struct file *file, unsigned long reqprot, | |
ed032189 EP |
2987 | unsigned long prot, unsigned long flags, |
2988 | unsigned long addr, unsigned long addr_only) | |
1da177e4 | 2989 | { |
ed032189 | 2990 | int rc = 0; |
b6dff3ec DH |
2991 | u32 sid = ((struct task_security_struct *) |
2992 | (current->cred->security))->sid; | |
1da177e4 | 2993 | |
ed032189 EP |
2994 | if (addr < mmap_min_addr) |
2995 | rc = avc_has_perm(sid, sid, SECCLASS_MEMPROTECT, | |
2996 | MEMPROTECT__MMAP_ZERO, NULL); | |
2997 | if (rc || addr_only) | |
1da177e4 LT |
2998 | return rc; |
2999 | ||
3000 | if (selinux_checkreqprot) | |
3001 | prot = reqprot; | |
3002 | ||
3003 | return file_map_prot_check(file, prot, | |
3004 | (flags & MAP_TYPE) == MAP_SHARED); | |
3005 | } | |
3006 | ||
3007 | static int selinux_file_mprotect(struct vm_area_struct *vma, | |
3008 | unsigned long reqprot, | |
3009 | unsigned long prot) | |
3010 | { | |
3011 | int rc; | |
3012 | ||
3013 | rc = secondary_ops->file_mprotect(vma, reqprot, prot); | |
3014 | if (rc) | |
3015 | return rc; | |
3016 | ||
3017 | if (selinux_checkreqprot) | |
3018 | prot = reqprot; | |
3019 | ||
3020 | #ifndef CONFIG_PPC32 | |
db4c9641 SS |
3021 | if ((prot & PROT_EXEC) && !(vma->vm_flags & VM_EXEC)) { |
3022 | rc = 0; | |
3023 | if (vma->vm_start >= vma->vm_mm->start_brk && | |
3024 | vma->vm_end <= vma->vm_mm->brk) { | |
3025 | rc = task_has_perm(current, current, | |
3026 | PROCESS__EXECHEAP); | |
3027 | } else if (!vma->vm_file && | |
3028 | vma->vm_start <= vma->vm_mm->start_stack && | |
3029 | vma->vm_end >= vma->vm_mm->start_stack) { | |
3030 | rc = task_has_perm(current, current, PROCESS__EXECSTACK); | |
3031 | } else if (vma->vm_file && vma->anon_vma) { | |
3032 | /* | |
3033 | * We are making executable a file mapping that has | |
3034 | * had some COW done. Since pages might have been | |
3035 | * written, check ability to execute the possibly | |
3036 | * modified content. This typically should only | |
3037 | * occur for text relocations. | |
3038 | */ | |
3039 | rc = file_has_perm(current, vma->vm_file, | |
3040 | FILE__EXECMOD); | |
3041 | } |