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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> | |
7 | * Chris Vance, <cvance@nai.com> | |
8 | * Wayne Salamon, <wsalamon@nai.com> | |
9 | * James Morris <jmorris@redhat.com> | |
10 | * | |
11 | * Copyright (C) 2001,2002 Networks Associates Technology, Inc. | |
12 | * Copyright (C) 2003-2008 Red Hat, Inc., James Morris <jmorris@redhat.com> | |
13 | * Eric Paris <eparis@redhat.com> | |
14 | * Copyright (C) 2004-2005 Trusted Computer Solutions, Inc. | |
15 | * <dgoeddel@trustedcs.com> | |
16 | * Copyright (C) 2006, 2007, 2009 Hewlett-Packard Development Company, L.P. | |
17 | * Paul Moore <paul.moore@hp.com> | |
18 | * Copyright (C) 2007 Hitachi Software Engineering Co., Ltd. | |
19 | * Yuichi Nakamura <ynakam@hitachisoft.jp> | |
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, | |
23 | * as published by the Free Software Foundation. | |
24 | */ | |
25 | ||
26 | #include <linux/init.h> | |
27 | #include <linux/kernel.h> | |
28 | #include <linux/tracehook.h> | |
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> | |
40 | #include <linux/spinlock.h> | |
41 | #include <linux/syscalls.h> | |
42 | #include <linux/file.h> | |
43 | #include <linux/fdtable.h> | |
44 | #include <linux/namei.h> | |
45 | #include <linux/mount.h> | |
46 | #include <linux/proc_fs.h> | |
47 | #include <linux/netfilter_ipv4.h> | |
48 | #include <linux/netfilter_ipv6.h> | |
49 | #include <linux/tty.h> | |
50 | #include <net/icmp.h> | |
51 | #include <net/ip.h> /* for local_port_range[] */ | |
52 | #include <net/tcp.h> /* struct or_callable used in sock_rcv_skb */ | |
53 | #include <net/net_namespace.h> | |
54 | #include <net/netlabel.h> | |
55 | #include <linux/uaccess.h> | |
56 | #include <asm/ioctls.h> | |
57 | #include <asm/atomic.h> | |
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> | |
64 | #include <linux/dccp.h> | |
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> | |
75 | #include <linux/string.h> | |
76 | #include <linux/selinux.h> | |
77 | #include <linux/mutex.h> | |
78 | #include <linux/posix-timers.h> | |
79 | #include <linux/syslog.h> | |
80 | ||
81 | #include "avc.h" | |
82 | #include "objsec.h" | |
83 | #include "netif.h" | |
84 | #include "netnode.h" | |
85 | #include "netport.h" | |
86 | #include "xfrm.h" | |
87 | #include "netlabel.h" | |
88 | #include "audit.h" | |
89 | ||
90 | #define NUM_SEL_MNT_OPTS 5 | |
91 | ||
92 | extern int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm); | |
93 | extern struct security_operations *security_ops; | |
94 | ||
95 | /* SECMARK reference count */ | |
96 | atomic_t selinux_secmark_refcount = ATOMIC_INIT(0); | |
97 | ||
98 | #ifdef CONFIG_SECURITY_SELINUX_DEVELOP | |
99 | int selinux_enforcing; | |
100 | ||
101 | static int __init enforcing_setup(char *str) | |
102 | { | |
103 | unsigned long enforcing; | |
104 | if (!strict_strtoul(str, 0, &enforcing)) | |
105 | selinux_enforcing = enforcing ? 1 : 0; | |
106 | return 1; | |
107 | } | |
108 | __setup("enforcing=", enforcing_setup); | |
109 | #endif | |
110 | ||
111 | #ifdef CONFIG_SECURITY_SELINUX_BOOTPARAM | |
112 | int selinux_enabled = CONFIG_SECURITY_SELINUX_BOOTPARAM_VALUE; | |
113 | ||
114 | static int __init selinux_enabled_setup(char *str) | |
115 | { | |
116 | unsigned long enabled; | |
117 | if (!strict_strtoul(str, 0, &enabled)) | |
118 | selinux_enabled = enabled ? 1 : 0; | |
119 | return 1; | |
120 | } | |
121 | __setup("selinux=", selinux_enabled_setup); | |
122 | #else | |
123 | int selinux_enabled = 1; | |
124 | #endif | |
125 | ||
126 | static struct kmem_cache *sel_inode_cache; | |
127 | ||
128 | /** | |
129 | * selinux_secmark_enabled - Check to see if SECMARK is currently enabled | |
130 | * | |
131 | * Description: | |
132 | * This function checks the SECMARK reference counter to see if any SECMARK | |
133 | * targets are currently configured, if the reference counter is greater than | |
134 | * zero SECMARK is considered to be enabled. Returns true (1) if SECMARK is | |
135 | * enabled, false (0) if SECMARK is disabled. | |
136 | * | |
137 | */ | |
138 | static int selinux_secmark_enabled(void) | |
139 | { | |
140 | return (atomic_read(&selinux_secmark_refcount) > 0); | |
141 | } | |
142 | ||
143 | /* | |
144 | * initialise the security for the init task | |
145 | */ | |
146 | static void cred_init_security(void) | |
147 | { | |
148 | struct cred *cred = (struct cred *) current->real_cred; | |
149 | struct task_security_struct *tsec; | |
150 | ||
151 | tsec = kzalloc(sizeof(struct task_security_struct), GFP_KERNEL); | |
152 | if (!tsec) | |
153 | panic("SELinux: Failed to initialize initial task.\n"); | |
154 | ||
155 | tsec->osid = tsec->sid = SECINITSID_KERNEL; | |
156 | cred->security = tsec; | |
157 | } | |
158 | ||
159 | /* | |
160 | * get the security ID of a set of credentials | |
161 | */ | |
162 | static inline u32 cred_sid(const struct cred *cred) | |
163 | { | |
164 | const struct task_security_struct *tsec; | |
165 | ||
166 | tsec = cred->security; | |
167 | return tsec->sid; | |
168 | } | |
169 | ||
170 | /* | |
171 | * get the objective security ID of a task | |
172 | */ | |
173 | static inline u32 task_sid(const struct task_struct *task) | |
174 | { | |
175 | u32 sid; | |
176 | ||
177 | rcu_read_lock(); | |
178 | sid = cred_sid(__task_cred(task)); | |
179 | rcu_read_unlock(); | |
180 | return sid; | |
181 | } | |
182 | ||
183 | /* | |
184 | * get the subjective security ID of the current task | |
185 | */ | |
186 | static inline u32 current_sid(void) | |
187 | { | |
188 | const struct task_security_struct *tsec = current_security(); | |
189 | ||
190 | return tsec->sid; | |
191 | } | |
192 | ||
193 | /* Allocate and free functions for each kind of security blob. */ | |
194 | ||
195 | static int inode_alloc_security(struct inode *inode) | |
196 | { | |
197 | struct inode_security_struct *isec; | |
198 | u32 sid = current_sid(); | |
199 | ||
200 | isec = kmem_cache_zalloc(sel_inode_cache, GFP_NOFS); | |
201 | if (!isec) | |
202 | return -ENOMEM; | |
203 | ||
204 | mutex_init(&isec->lock); | |
205 | INIT_LIST_HEAD(&isec->list); | |
206 | isec->inode = inode; | |
207 | isec->sid = SECINITSID_UNLABELED; | |
208 | isec->sclass = SECCLASS_FILE; | |
209 | isec->task_sid = sid; | |
210 | inode->i_security = isec; | |
211 | ||
212 | return 0; | |
213 | } | |
214 | ||
215 | static void inode_free_security(struct inode *inode) | |
216 | { | |
217 | struct inode_security_struct *isec = inode->i_security; | |
218 | struct superblock_security_struct *sbsec = inode->i_sb->s_security; | |
219 | ||
220 | spin_lock(&sbsec->isec_lock); | |
221 | if (!list_empty(&isec->list)) | |
222 | list_del_init(&isec->list); | |
223 | spin_unlock(&sbsec->isec_lock); | |
224 | ||
225 | inode->i_security = NULL; | |
226 | kmem_cache_free(sel_inode_cache, isec); | |
227 | } | |
228 | ||
229 | static int file_alloc_security(struct file *file) | |
230 | { | |
231 | struct file_security_struct *fsec; | |
232 | u32 sid = current_sid(); | |
233 | ||
234 | fsec = kzalloc(sizeof(struct file_security_struct), GFP_KERNEL); | |
235 | if (!fsec) | |
236 | return -ENOMEM; | |
237 | ||
238 | fsec->sid = sid; | |
239 | fsec->fown_sid = sid; | |
240 | file->f_security = fsec; | |
241 | ||
242 | return 0; | |
243 | } | |
244 | ||
245 | static void file_free_security(struct file *file) | |
246 | { | |
247 | struct file_security_struct *fsec = file->f_security; | |
248 | file->f_security = NULL; | |
249 | kfree(fsec); | |
250 | } | |
251 | ||
252 | static int superblock_alloc_security(struct super_block *sb) | |
253 | { | |
254 | struct superblock_security_struct *sbsec; | |
255 | ||
256 | sbsec = kzalloc(sizeof(struct superblock_security_struct), GFP_KERNEL); | |
257 | if (!sbsec) | |
258 | return -ENOMEM; | |
259 | ||
260 | mutex_init(&sbsec->lock); | |
261 | INIT_LIST_HEAD(&sbsec->isec_head); | |
262 | spin_lock_init(&sbsec->isec_lock); | |
263 | sbsec->sb = sb; | |
264 | sbsec->sid = SECINITSID_UNLABELED; | |
265 | sbsec->def_sid = SECINITSID_FILE; | |
266 | sbsec->mntpoint_sid = SECINITSID_UNLABELED; | |
267 | sb->s_security = sbsec; | |
268 | ||
269 | return 0; | |
270 | } | |
271 | ||
272 | static void superblock_free_security(struct super_block *sb) | |
273 | { | |
274 | struct superblock_security_struct *sbsec = sb->s_security; | |
275 | sb->s_security = NULL; | |
276 | kfree(sbsec); | |
277 | } | |
278 | ||
279 | /* The security server must be initialized before | |
280 | any labeling or access decisions can be provided. */ | |
281 | extern int ss_initialized; | |
282 | ||
283 | /* The file system's label must be initialized prior to use. */ | |
284 | ||
285 | static const char *labeling_behaviors[6] = { | |
286 | "uses xattr", | |
287 | "uses transition SIDs", | |
288 | "uses task SIDs", | |
289 | "uses genfs_contexts", | |
290 | "not configured for labeling", | |
291 | "uses mountpoint labeling", | |
292 | }; | |
293 | ||
294 | static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dentry); | |
295 | ||
296 | static inline int inode_doinit(struct inode *inode) | |
297 | { | |
298 | return inode_doinit_with_dentry(inode, NULL); | |
299 | } | |
300 | ||
301 | enum { | |
302 | Opt_error = -1, | |
303 | Opt_context = 1, | |
304 | Opt_fscontext = 2, | |
305 | Opt_defcontext = 3, | |
306 | Opt_rootcontext = 4, | |
307 | Opt_labelsupport = 5, | |
308 | }; | |
309 | ||
310 | static const match_table_t tokens = { | |
311 | {Opt_context, CONTEXT_STR "%s"}, | |
312 | {Opt_fscontext, FSCONTEXT_STR "%s"}, | |
313 | {Opt_defcontext, DEFCONTEXT_STR "%s"}, | |
314 | {Opt_rootcontext, ROOTCONTEXT_STR "%s"}, | |
315 | {Opt_labelsupport, LABELSUPP_STR}, | |
316 | {Opt_error, NULL}, | |
317 | }; | |
318 | ||
319 | #define SEL_MOUNT_FAIL_MSG "SELinux: duplicate or incompatible mount options\n" | |
320 | ||
321 | static int may_context_mount_sb_relabel(u32 sid, | |
322 | struct superblock_security_struct *sbsec, | |
323 | const struct cred *cred) | |
324 | { | |
325 | const struct task_security_struct *tsec = cred->security; | |
326 | int rc; | |
327 | ||
328 | rc = avc_has_perm(tsec->sid, sbsec->sid, SECCLASS_FILESYSTEM, | |
329 | FILESYSTEM__RELABELFROM, NULL); | |
330 | if (rc) | |
331 | return rc; | |
332 | ||
333 | rc = avc_has_perm(tsec->sid, sid, SECCLASS_FILESYSTEM, | |
334 | FILESYSTEM__RELABELTO, NULL); | |
335 | return rc; | |
336 | } | |
337 | ||
338 | static int may_context_mount_inode_relabel(u32 sid, | |
339 | struct superblock_security_struct *sbsec, | |
340 | const struct cred *cred) | |
341 | { | |
342 | const struct task_security_struct *tsec = cred->security; | |
343 | int rc; | |
344 | rc = avc_has_perm(tsec->sid, sbsec->sid, SECCLASS_FILESYSTEM, | |
345 | FILESYSTEM__RELABELFROM, NULL); | |
346 | if (rc) | |
347 | return rc; | |
348 | ||
349 | rc = avc_has_perm(sid, sbsec->sid, SECCLASS_FILESYSTEM, | |
350 | FILESYSTEM__ASSOCIATE, NULL); | |
351 | return rc; | |
352 | } | |
353 | ||
354 | static int sb_finish_set_opts(struct super_block *sb) | |
355 | { | |
356 | struct superblock_security_struct *sbsec = sb->s_security; | |
357 | struct dentry *root = sb->s_root; | |
358 | struct inode *root_inode = root->d_inode; | |
359 | int rc = 0; | |
360 | ||
361 | if (sbsec->behavior == SECURITY_FS_USE_XATTR) { | |
362 | /* Make sure that the xattr handler exists and that no | |
363 | error other than -ENODATA is returned by getxattr on | |
364 | the root directory. -ENODATA is ok, as this may be | |
365 | the first boot of the SELinux kernel before we have | |
366 | assigned xattr values to the filesystem. */ | |
367 | if (!root_inode->i_op->getxattr) { | |
368 | printk(KERN_WARNING "SELinux: (dev %s, type %s) has no " | |
369 | "xattr support\n", sb->s_id, sb->s_type->name); | |
370 | rc = -EOPNOTSUPP; | |
371 | goto out; | |
372 | } | |
373 | rc = root_inode->i_op->getxattr(root, XATTR_NAME_SELINUX, NULL, 0); | |
374 | if (rc < 0 && rc != -ENODATA) { | |
375 | if (rc == -EOPNOTSUPP) | |
376 | printk(KERN_WARNING "SELinux: (dev %s, type " | |
377 | "%s) has no security xattr handler\n", | |
378 | sb->s_id, sb->s_type->name); | |
379 | else | |
380 | printk(KERN_WARNING "SELinux: (dev %s, type " | |
381 | "%s) getxattr errno %d\n", sb->s_id, | |
382 | sb->s_type->name, -rc); | |
383 | goto out; | |
384 | } | |
385 | } | |
386 | ||
387 | sbsec->flags |= (SE_SBINITIALIZED | SE_SBLABELSUPP); | |
388 | ||
389 | if (sbsec->behavior > ARRAY_SIZE(labeling_behaviors)) | |
390 | printk(KERN_ERR "SELinux: initialized (dev %s, type %s), unknown behavior\n", | |
391 | sb->s_id, sb->s_type->name); | |
392 | else | |
393 | printk(KERN_DEBUG "SELinux: initialized (dev %s, type %s), %s\n", | |
394 | sb->s_id, sb->s_type->name, | |
395 | labeling_behaviors[sbsec->behavior-1]); | |
396 | ||
397 | if (sbsec->behavior == SECURITY_FS_USE_GENFS || | |
398 | sbsec->behavior == SECURITY_FS_USE_MNTPOINT || | |
399 | sbsec->behavior == SECURITY_FS_USE_NONE || | |
400 | sbsec->behavior > ARRAY_SIZE(labeling_behaviors)) | |
401 | sbsec->flags &= ~SE_SBLABELSUPP; | |
402 | ||
403 | /* Special handling for sysfs. Is genfs but also has setxattr handler*/ | |
404 | if (strncmp(sb->s_type->name, "sysfs", sizeof("sysfs")) == 0) | |
405 | sbsec->flags |= SE_SBLABELSUPP; | |
406 | ||
407 | /* Initialize the root inode. */ | |
408 | rc = inode_doinit_with_dentry(root_inode, root); | |
409 | ||
410 | /* Initialize any other inodes associated with the superblock, e.g. | |
411 | inodes created prior to initial policy load or inodes created | |
412 | during get_sb by a pseudo filesystem that directly | |
413 | populates itself. */ | |
414 | spin_lock(&sbsec->isec_lock); | |
415 | next_inode: | |
416 | if (!list_empty(&sbsec->isec_head)) { | |
417 | struct inode_security_struct *isec = | |
418 | list_entry(sbsec->isec_head.next, | |
419 | struct inode_security_struct, list); | |
420 | struct inode *inode = isec->inode; | |
421 | spin_unlock(&sbsec->isec_lock); | |
422 | inode = igrab(inode); | |
423 | if (inode) { | |
424 | if (!IS_PRIVATE(inode)) | |
425 | inode_doinit(inode); | |
426 | iput(inode); | |
427 | } | |
428 | spin_lock(&sbsec->isec_lock); | |
429 | list_del_init(&isec->list); | |
430 | goto next_inode; | |
431 | } | |
432 | spin_unlock(&sbsec->isec_lock); | |
433 | out: | |
434 | return rc; | |
435 | } | |
436 | ||
437 | /* | |
438 | * This function should allow an FS to ask what it's mount security | |
439 | * options were so it can use those later for submounts, displaying | |
440 | * mount options, or whatever. | |
441 | */ | |
442 | static int selinux_get_mnt_opts(const struct super_block *sb, | |
443 | struct security_mnt_opts *opts) | |
444 | { | |
445 | int rc = 0, i; | |
446 | struct superblock_security_struct *sbsec = sb->s_security; | |
447 | char *context = NULL; | |
448 | u32 len; | |
449 | char tmp; | |
450 | ||
451 | security_init_mnt_opts(opts); | |
452 | ||
453 | if (!(sbsec->flags & SE_SBINITIALIZED)) | |
454 | return -EINVAL; | |
455 | ||
456 | if (!ss_initialized) | |
457 | return -EINVAL; | |
458 | ||
459 | tmp = sbsec->flags & SE_MNTMASK; | |
460 | /* count the number of mount options for this sb */ | |
461 | for (i = 0; i < 8; i++) { | |
462 | if (tmp & 0x01) | |
463 | opts->num_mnt_opts++; | |
464 | tmp >>= 1; | |
465 | } | |
466 | /* Check if the Label support flag is set */ | |
467 | if (sbsec->flags & SE_SBLABELSUPP) | |
468 | opts->num_mnt_opts++; | |
469 | ||
470 | opts->mnt_opts = kcalloc(opts->num_mnt_opts, sizeof(char *), GFP_ATOMIC); | |
471 | if (!opts->mnt_opts) { | |
472 | rc = -ENOMEM; | |
473 | goto out_free; | |
474 | } | |
475 | ||
476 | opts->mnt_opts_flags = kcalloc(opts->num_mnt_opts, sizeof(int), GFP_ATOMIC); | |
477 | if (!opts->mnt_opts_flags) { | |
478 | rc = -ENOMEM; | |
479 | goto out_free; | |
480 | } | |
481 | ||
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; | |
487 | opts->mnt_opts[i] = context; | |
488 | opts->mnt_opts_flags[i++] = FSCONTEXT_MNT; | |
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; | |
494 | opts->mnt_opts[i] = context; | |
495 | opts->mnt_opts_flags[i++] = CONTEXT_MNT; | |
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; | |
501 | opts->mnt_opts[i] = context; | |
502 | opts->mnt_opts_flags[i++] = DEFCONTEXT_MNT; | |
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; | |
507 | ||
508 | rc = security_sid_to_context(isec->sid, &context, &len); | |
509 | if (rc) | |
510 | goto out_free; | |
511 | opts->mnt_opts[i] = context; | |
512 | opts->mnt_opts_flags[i++] = ROOTCONTEXT_MNT; | |
513 | } | |
514 | if (sbsec->flags & SE_SBLABELSUPP) { | |
515 | opts->mnt_opts[i] = NULL; | |
516 | opts->mnt_opts_flags[i++] = SE_SBLABELSUPP; | |
517 | } | |
518 | ||
519 | BUG_ON(i != opts->num_mnt_opts); | |
520 | ||
521 | return 0; | |
522 | ||
523 | out_free: | |
524 | security_free_mnt_opts(opts); | |
525 | return rc; | |
526 | } | |
527 | ||
528 | static int bad_option(struct superblock_security_struct *sbsec, char flag, | |
529 | u32 old_sid, u32 new_sid) | |
530 | { | |
531 | char mnt_flags = sbsec->flags & SE_MNTMASK; | |
532 | ||
533 | /* check if the old mount command had the same options */ | |
534 | if (sbsec->flags & SE_SBINITIALIZED) | |
535 | if (!(sbsec->flags & flag) || | |
536 | (old_sid != new_sid)) | |
537 | return 1; | |
538 | ||
539 | /* check if we were passed the same options twice, | |
540 | * aka someone passed context=a,context=b | |
541 | */ | |
542 | if (!(sbsec->flags & SE_SBINITIALIZED)) | |
543 | if (mnt_flags & flag) | |
544 | return 1; | |
545 | return 0; | |
546 | } | |
547 | ||
548 | /* | |
549 | * Allow filesystems with binary mount data to explicitly set mount point | |
550 | * labeling information. | |
551 | */ | |
552 | static int selinux_set_mnt_opts(struct super_block *sb, | |
553 | struct security_mnt_opts *opts) | |
554 | { | |
555 | const struct cred *cred = current_cred(); | |
556 | int rc = 0, i; | |
557 | struct superblock_security_struct *sbsec = sb->s_security; | |
558 | const char *name = sb->s_type->name; | |
559 | struct inode *inode = sbsec->sb->s_root->d_inode; | |
560 | struct inode_security_struct *root_isec = inode->i_security; | |
561 | u32 fscontext_sid = 0, context_sid = 0, rootcontext_sid = 0; | |
562 | u32 defcontext_sid = 0; | |
563 | char **mount_options = opts->mnt_opts; | |
564 | int *flags = opts->mnt_opts_flags; | |
565 | int num_opts = opts->num_mnt_opts; | |
566 | ||
567 | mutex_lock(&sbsec->lock); | |
568 | ||
569 | if (!ss_initialized) { | |
570 | if (!num_opts) { | |
571 | /* Defer initialization until selinux_complete_init, | |
572 | after the initial policy is loaded and the security | |
573 | server is ready to handle calls. */ | |
574 | goto out; | |
575 | } | |
576 | rc = -EINVAL; | |
577 | printk(KERN_WARNING "SELinux: Unable to set superblock options " | |
578 | "before the security server is initialized\n"); | |
579 | goto out; | |
580 | } | |
581 | ||
582 | /* | |
583 | * Binary mount data FS will come through this function twice. Once | |
584 | * from an explicit call and once from the generic calls from the vfs. | |
585 | * Since the generic VFS calls will not contain any security mount data | |
586 | * we need to skip the double mount verification. | |
587 | * | |
588 | * This does open a hole in which we will not notice if the first | |
589 | * mount using this sb set explict options and a second mount using | |
590 | * this sb does not set any security options. (The first options | |
591 | * will be used for both mounts) | |
592 | */ | |
593 | if ((sbsec->flags & SE_SBINITIALIZED) && (sb->s_type->fs_flags & FS_BINARY_MOUNTDATA) | |
594 | && (num_opts == 0)) | |
595 | goto out; | |
596 | ||
597 | /* | |
598 | * parse the mount options, check if they are valid sids. | |
599 | * also check if someone is trying to mount the same sb more | |
600 | * than once with different security options. | |
601 | */ | |
602 | for (i = 0; i < num_opts; i++) { | |
603 | u32 sid; | |
604 | ||
605 | if (flags[i] == SE_SBLABELSUPP) | |
606 | continue; | |
607 | rc = security_context_to_sid(mount_options[i], | |
608 | strlen(mount_options[i]), &sid); | |
609 | if (rc) { | |
610 | printk(KERN_WARNING "SELinux: security_context_to_sid" | |
611 | "(%s) failed for (dev %s, type %s) errno=%d\n", | |
612 | mount_options[i], sb->s_id, name, rc); | |
613 | goto out; | |
614 | } | |
615 | switch (flags[i]) { | |
616 | case FSCONTEXT_MNT: | |
617 | fscontext_sid = sid; | |
618 | ||
619 | if (bad_option(sbsec, FSCONTEXT_MNT, sbsec->sid, | |
620 | fscontext_sid)) | |
621 | goto out_double_mount; | |
622 | ||
623 | sbsec->flags |= FSCONTEXT_MNT; | |
624 | break; | |
625 | case CONTEXT_MNT: | |
626 | context_sid = sid; | |
627 | ||
628 | if (bad_option(sbsec, CONTEXT_MNT, sbsec->mntpoint_sid, | |
629 | context_sid)) | |
630 | goto out_double_mount; | |
631 | ||
632 | sbsec->flags |= CONTEXT_MNT; | |
633 | break; | |
634 | case ROOTCONTEXT_MNT: | |
635 | rootcontext_sid = sid; | |
636 | ||
637 | if (bad_option(sbsec, ROOTCONTEXT_MNT, root_isec->sid, | |
638 | rootcontext_sid)) | |
639 | goto out_double_mount; | |
640 | ||
641 | sbsec->flags |= ROOTCONTEXT_MNT; | |
642 | ||
643 | break; | |
644 | case DEFCONTEXT_MNT: | |
645 | defcontext_sid = sid; | |
646 | ||
647 | if (bad_option(sbsec, DEFCONTEXT_MNT, sbsec->def_sid, | |
648 | defcontext_sid)) | |
649 | goto out_double_mount; | |
650 | ||
651 | sbsec->flags |= DEFCONTEXT_MNT; | |
652 | ||
653 | break; | |
654 | default: | |
655 | rc = -EINVAL; | |
656 | goto out; | |
657 | } | |
658 | } | |
659 | ||
660 | if (sbsec->flags & SE_SBINITIALIZED) { | |
661 | /* previously mounted with options, but not on this attempt? */ | |
662 | if ((sbsec->flags & SE_MNTMASK) && !num_opts) | |
663 | goto out_double_mount; | |
664 | rc = 0; | |
665 | goto out; | |
666 | } | |
667 | ||
668 | if (strcmp(sb->s_type->name, "proc") == 0) | |
669 | sbsec->flags |= SE_SBPROC; | |
670 | ||
671 | /* Determine the labeling behavior to use for this filesystem type. */ | |
672 | rc = security_fs_use((sbsec->flags & SE_SBPROC) ? "proc" : sb->s_type->name, &sbsec->behavior, &sbsec->sid); | |
673 | if (rc) { | |
674 | printk(KERN_WARNING "%s: security_fs_use(%s) returned %d\n", | |
675 | __func__, sb->s_type->name, rc); | |
676 | goto out; | |
677 | } | |
678 | ||
679 | /* sets the context of the superblock for the fs being mounted. */ | |
680 | if (fscontext_sid) { | |
681 | rc = may_context_mount_sb_relabel(fscontext_sid, sbsec, cred); | |
682 | if (rc) | |
683 | goto out; | |
684 | ||
685 | sbsec->sid = fscontext_sid; | |
686 | } | |
687 | ||
688 | /* | |
689 | * Switch to using mount point labeling behavior. | |
690 | * sets the label used on all file below the mountpoint, and will set | |
691 | * the superblock context if not already set. | |
692 | */ | |
693 | if (context_sid) { | |
694 | if (!fscontext_sid) { | |
695 | rc = may_context_mount_sb_relabel(context_sid, sbsec, | |
696 | cred); | |
697 | if (rc) | |
698 | goto out; | |
699 | sbsec->sid = context_sid; | |
700 | } else { | |
701 | rc = may_context_mount_inode_relabel(context_sid, sbsec, | |
702 | cred); | |
703 | if (rc) | |
704 | goto out; | |
705 | } | |
706 | if (!rootcontext_sid) | |
707 | rootcontext_sid = context_sid; | |
708 | ||
709 | sbsec->mntpoint_sid = context_sid; | |
710 | sbsec->behavior = SECURITY_FS_USE_MNTPOINT; | |
711 | } | |
712 | ||
713 | if (rootcontext_sid) { | |
714 | rc = may_context_mount_inode_relabel(rootcontext_sid, sbsec, | |
715 | cred); | |
716 | if (rc) | |
717 | goto out; | |
718 | ||
719 | root_isec->sid = rootcontext_sid; | |
720 | root_isec->initialized = 1; | |
721 | } | |
722 | ||
723 | if (defcontext_sid) { | |
724 | if (sbsec->behavior != SECURITY_FS_USE_XATTR) { | |
725 | rc = -EINVAL; | |
726 | printk(KERN_WARNING "SELinux: defcontext option is " | |
727 | "invalid for this filesystem type\n"); | |
728 | goto out; | |
729 | } | |
730 | ||
731 | if (defcontext_sid != sbsec->def_sid) { | |
732 | rc = may_context_mount_inode_relabel(defcontext_sid, | |
733 | sbsec, cred); | |
734 | if (rc) | |
735 | goto out; | |
736 | } | |
737 | ||
738 | sbsec->def_sid = defcontext_sid; | |
739 | } | |
740 | ||
741 | rc = sb_finish_set_opts(sb); | |
742 | out: | |
743 | mutex_unlock(&sbsec->lock); | |
744 | return rc; | |
745 | out_double_mount: | |
746 | rc = -EINVAL; | |
747 | printk(KERN_WARNING "SELinux: mount invalid. Same superblock, different " | |
748 | "security settings for (dev %s, type %s)\n", sb->s_id, name); | |
749 | goto out; | |
750 | } | |
751 | ||
752 | static void selinux_sb_clone_mnt_opts(const struct super_block *oldsb, | |
753 | struct super_block *newsb) | |
754 | { | |
755 | const struct superblock_security_struct *oldsbsec = oldsb->s_security; | |
756 | struct superblock_security_struct *newsbsec = newsb->s_security; | |
757 | ||
758 | int set_fscontext = (oldsbsec->flags & FSCONTEXT_MNT); | |
759 | int set_context = (oldsbsec->flags & CONTEXT_MNT); | |
760 | int set_rootcontext = (oldsbsec->flags & ROOTCONTEXT_MNT); | |
761 | ||
762 | /* | |
763 | * if the parent was able to be mounted it clearly had no special lsm | |
764 | * mount options. thus we can safely deal with this superblock later | |
765 | */ | |
766 | if (!ss_initialized) | |
767 | return; | |
768 | ||
769 | /* how can we clone if the old one wasn't set up?? */ | |
770 | BUG_ON(!(oldsbsec->flags & SE_SBINITIALIZED)); | |
771 | ||
772 | /* if fs is reusing a sb, just let its options stand... */ | |
773 | if (newsbsec->flags & SE_SBINITIALIZED) | |
774 | return; | |
775 | ||
776 | mutex_lock(&newsbsec->lock); | |
777 | ||
778 | newsbsec->flags = oldsbsec->flags; | |
779 | ||
780 | newsbsec->sid = oldsbsec->sid; | |
781 | newsbsec->def_sid = oldsbsec->def_sid; | |
782 | newsbsec->behavior = oldsbsec->behavior; | |
783 | ||
784 | if (set_context) { | |
785 | u32 sid = oldsbsec->mntpoint_sid; | |
786 | ||
787 | if (!set_fscontext) | |
788 | newsbsec->sid = sid; | |
789 | if (!set_rootcontext) { | |
790 | struct inode *newinode = newsb->s_root->d_inode; | |
791 | struct inode_security_struct *newisec = newinode->i_security; | |
792 | newisec->sid = sid; | |
793 | } | |
794 | newsbsec->mntpoint_sid = sid; | |
795 | } | |
796 | if (set_rootcontext) { | |
797 | const struct inode *oldinode = oldsb->s_root->d_inode; | |
798 | const struct inode_security_struct *oldisec = oldinode->i_security; | |
799 | struct inode *newinode = newsb->s_root->d_inode; | |
800 | struct inode_security_struct *newisec = newinode->i_security; | |
801 | ||
802 | newisec->sid = oldisec->sid; | |
803 | } | |
804 | ||
805 | sb_finish_set_opts(newsb); | |
806 | mutex_unlock(&newsbsec->lock); | |
807 | } | |
808 | ||
809 | static int selinux_parse_opts_str(char *options, | |
810 | struct security_mnt_opts *opts) | |
811 | { | |
812 | char *p; | |
813 | char *context = NULL, *defcontext = NULL; | |
814 | char *fscontext = NULL, *rootcontext = NULL; | |
815 | int rc, num_mnt_opts = 0; | |
816 | ||
817 | opts->num_mnt_opts = 0; | |
818 | ||
819 | /* Standard string-based options. */ | |
820 | while ((p = strsep(&options, "|")) != NULL) { | |
821 | int token; | |
822 | substring_t args[MAX_OPT_ARGS]; | |
823 | ||
824 | if (!*p) | |
825 | continue; | |
826 | ||
827 | token = match_token(p, tokens, args); | |
828 | ||
829 | switch (token) { | |
830 | case Opt_context: | |
831 | if (context || defcontext) { | |
832 | rc = -EINVAL; | |
833 | printk(KERN_WARNING SEL_MOUNT_FAIL_MSG); | |
834 | goto out_err; | |
835 | } | |
836 | context = match_strdup(&args[0]); | |
837 | if (!context) { | |
838 | rc = -ENOMEM; | |
839 | goto out_err; | |
840 | } | |
841 | break; | |
842 | ||
843 | case Opt_fscontext: | |
844 | if (fscontext) { | |
845 | rc = -EINVAL; | |
846 | printk(KERN_WARNING SEL_MOUNT_FAIL_MSG); | |
847 | goto out_err; | |
848 | } | |
849 | fscontext = match_strdup(&args[0]); | |
850 | if (!fscontext) { | |
851 | rc = -ENOMEM; | |
852 | goto out_err; | |
853 | } | |
854 | break; | |
855 | ||
856 | case Opt_rootcontext: | |
857 | if (rootcontext) { | |
858 | rc = -EINVAL; | |
859 | printk(KERN_WARNING SEL_MOUNT_FAIL_MSG); | |
860 | goto out_err; | |
861 | } | |
862 | rootcontext = match_strdup(&args[0]); | |
863 | if (!rootcontext) { | |
864 | rc = -ENOMEM; | |
865 | goto out_err; | |
866 | } | |
867 | break; | |
868 | ||
869 | case Opt_defcontext: | |
870 | if (context || defcontext) { | |
871 | rc = -EINVAL; | |
872 | printk(KERN_WARNING SEL_MOUNT_FAIL_MSG); | |
873 | goto out_err; | |
874 | } | |
875 | defcontext = match_strdup(&args[0]); | |
876 | if (!defcontext) { | |
877 | rc = -ENOMEM; | |
878 | goto out_err; | |
879 | } | |
880 | break; | |
881 | case Opt_labelsupport: | |
882 | break; | |
883 | default: | |
884 | rc = -EINVAL; | |
885 | printk(KERN_WARNING "SELinux: unknown mount option\n"); | |
886 | goto out_err; | |
887 | ||
888 | } | |
889 | } | |
890 | ||
891 | rc = -ENOMEM; | |
892 | opts->mnt_opts = kcalloc(NUM_SEL_MNT_OPTS, sizeof(char *), GFP_ATOMIC); | |
893 | if (!opts->mnt_opts) | |
894 | goto out_err; | |
895 | ||
896 | opts->mnt_opts_flags = kcalloc(NUM_SEL_MNT_OPTS, sizeof(int), GFP_ATOMIC); | |
897 | if (!opts->mnt_opts_flags) { | |
898 | kfree(opts->mnt_opts); | |
899 | goto out_err; | |
900 | } | |
901 | ||
902 | if (fscontext) { | |
903 | opts->mnt_opts[num_mnt_opts] = fscontext; | |
904 | opts->mnt_opts_flags[num_mnt_opts++] = FSCONTEXT_MNT; | |
905 | } | |
906 | if (context) { | |
907 | opts->mnt_opts[num_mnt_opts] = context; | |
908 | opts->mnt_opts_flags[num_mnt_opts++] = CONTEXT_MNT; | |
909 | } | |
910 | if (rootcontext) { | |
911 | opts->mnt_opts[num_mnt_opts] = rootcontext; | |
912 | opts->mnt_opts_flags[num_mnt_opts++] = ROOTCONTEXT_MNT; | |
913 | } | |
914 | if (defcontext) { | |
915 | opts->mnt_opts[num_mnt_opts] = defcontext; | |
916 | opts->mnt_opts_flags[num_mnt_opts++] = DEFCONTEXT_MNT; | |
917 | } | |
918 | ||
919 | opts->num_mnt_opts = num_mnt_opts; | |
920 | return 0; | |
921 | ||
922 | out_err: | |
923 | kfree(context); | |
924 | kfree(defcontext); | |
925 | kfree(fscontext); | |
926 | kfree(rootcontext); | |
927 | return rc; | |
928 | } | |
929 | /* | |
930 | * string mount options parsing and call set the sbsec | |
931 | */ | |
932 | static int superblock_doinit(struct super_block *sb, void *data) | |
933 | { | |
934 | int rc = 0; | |
935 | char *options = data; | |
936 | struct security_mnt_opts opts; | |
937 | ||
938 | security_init_mnt_opts(&opts); | |
939 | ||
940 | if (!data) | |
941 | goto out; | |
942 | ||
943 | BUG_ON(sb->s_type->fs_flags & FS_BINARY_MOUNTDATA); | |
944 | ||
945 | rc = selinux_parse_opts_str(options, &opts); | |
946 | if (rc) | |
947 | goto out_err; | |
948 | ||
949 | out: | |
950 | rc = selinux_set_mnt_opts(sb, &opts); | |
951 | ||
952 | out_err: | |
953 | security_free_mnt_opts(&opts); | |
954 | return rc; | |
955 | } | |
956 | ||
957 | static void selinux_write_opts(struct seq_file *m, | |
958 | struct security_mnt_opts *opts) | |
959 | { | |
960 | int i; | |
961 | char *prefix; | |
962 | ||
963 | for (i = 0; i < opts->num_mnt_opts; i++) { | |
964 | char *has_comma; | |
965 | ||
966 | if (opts->mnt_opts[i]) | |
967 | has_comma = strchr(opts->mnt_opts[i], ','); | |
968 | else | |
969 | has_comma = NULL; | |
970 | ||
971 | switch (opts->mnt_opts_flags[i]) { | |
972 | case CONTEXT_MNT: | |
973 | prefix = CONTEXT_STR; | |
974 | break; | |
975 | case FSCONTEXT_MNT: | |
976 | prefix = FSCONTEXT_STR; | |
977 | break; | |
978 | case ROOTCONTEXT_MNT: | |
979 | prefix = ROOTCONTEXT_STR; | |
980 | break; | |
981 | case DEFCONTEXT_MNT: | |
982 | prefix = DEFCONTEXT_STR; | |
983 | break; | |
984 | case SE_SBLABELSUPP: | |
985 | seq_putc(m, ','); | |
986 | seq_puts(m, LABELSUPP_STR); | |
987 | continue; | |
988 | default: | |
989 | BUG(); | |
990 | }; | |
991 | /* we need a comma before each option */ | |
992 | seq_putc(m, ','); | |
993 | seq_puts(m, prefix); | |
994 | if (has_comma) | |
995 | seq_putc(m, '\"'); | |
996 | seq_puts(m, opts->mnt_opts[i]); | |
997 | if (has_comma) | |
998 | seq_putc(m, '\"'); | |
999 | } | |
1000 | } | |
1001 | ||
1002 | static int selinux_sb_show_options(struct seq_file *m, struct super_block *sb) | |
1003 | { | |
1004 | struct security_mnt_opts opts; | |
1005 | int rc; | |
1006 | ||
1007 | rc = selinux_get_mnt_opts(sb, &opts); | |
1008 | if (rc) { | |
1009 | /* before policy load we may get EINVAL, don't show anything */ | |
1010 | if (rc == -EINVAL) | |
1011 | rc = 0; | |
1012 | return rc; | |
1013 | } | |
1014 | ||
1015 | selinux_write_opts(m, &opts); | |
1016 | ||
1017 | security_free_mnt_opts(&opts); | |
1018 | ||
1019 | return rc; | |
1020 | } | |
1021 | ||
1022 | static inline u16 inode_mode_to_security_class(umode_t mode) | |
1023 | { | |
1024 | switch (mode & S_IFMT) { | |
1025 | case S_IFSOCK: | |
1026 | return SECCLASS_SOCK_FILE; | |
1027 | case S_IFLNK: | |
1028 | return SECCLASS_LNK_FILE; | |
1029 | case S_IFREG: | |
1030 | return SECCLASS_FILE; | |
1031 | case S_IFBLK: | |
1032 | return SECCLASS_BLK_FILE; | |
1033 | case S_IFDIR: | |
1034 | return SECCLASS_DIR; | |
1035 | case S_IFCHR: | |
1036 | return SECCLASS_CHR_FILE; | |
1037 | case S_IFIFO: | |
1038 | return SECCLASS_FIFO_FILE; | |
1039 | ||
1040 | } | |
1041 | ||
1042 | return SECCLASS_FILE; | |
1043 | } | |
1044 | ||
1045 | static inline int default_protocol_stream(int protocol) | |
1046 | { | |
1047 | return (protocol == IPPROTO_IP || protocol == IPPROTO_TCP); | |
1048 | } | |
1049 | ||
1050 | static inline int default_protocol_dgram(int protocol) | |
1051 | { | |
1052 | return (protocol == IPPROTO_IP || protocol == IPPROTO_UDP); | |
1053 | } | |
1054 | ||
1055 | static inline u16 socket_type_to_security_class(int family, int type, int protocol) | |
1056 | { | |
1057 | switch (family) { | |
1058 | case PF_UNIX: | |
1059 | switch (type) { | |
1060 | case SOCK_STREAM: | |
1061 | case SOCK_SEQPACKET: | |
1062 | return SECCLASS_UNIX_STREAM_SOCKET; | |
1063 | case SOCK_DGRAM: | |
1064 | return SECCLASS_UNIX_DGRAM_SOCKET; | |
1065 | } | |
1066 | break; | |
1067 | case PF_INET: | |
1068 | case PF_INET6: | |
1069 | switch (type) { | |
1070 | case SOCK_STREAM: | |
1071 | if (default_protocol_stream(protocol)) | |
1072 | return SECCLASS_TCP_SOCKET; | |
1073 | else | |
1074 | return SECCLASS_RAWIP_SOCKET; | |
1075 | case SOCK_DGRAM: | |
1076 | if (default_protocol_dgram(protocol)) | |
1077 | return SECCLASS_UDP_SOCKET; | |
1078 | else | |
1079 | return SECCLASS_RAWIP_SOCKET; | |
1080 | case SOCK_DCCP: | |
1081 | return SECCLASS_DCCP_SOCKET; | |
1082 | default: | |
1083 | return SECCLASS_RAWIP_SOCKET; | |
1084 | } | |
1085 | break; | |
1086 | case PF_NETLINK: | |
1087 | switch (protocol) { | |
1088 | case NETLINK_ROUTE: | |
1089 | return SECCLASS_NETLINK_ROUTE_SOCKET; | |
1090 | case NETLINK_FIREWALL: | |
1091 | return SECCLASS_NETLINK_FIREWALL_SOCKET; | |
1092 | case NETLINK_INET_DIAG: | |
1093 | return SECCLASS_NETLINK_TCPDIAG_SOCKET; | |
1094 | case NETLINK_NFLOG: | |
1095 | return SECCLASS_NETLINK_NFLOG_SOCKET; | |
1096 | case NETLINK_XFRM: | |
1097 | return SECCLASS_NETLINK_XFRM_SOCKET; | |
1098 | case NETLINK_SELINUX: | |
1099 | return SECCLASS_NETLINK_SELINUX_SOCKET; | |
1100 | case NETLINK_AUDIT: | |
1101 | return SECCLASS_NETLINK_AUDIT_SOCKET; | |
1102 | case NETLINK_IP6_FW: | |
1103 | return SECCLASS_NETLINK_IP6FW_SOCKET; | |
1104 | case NETLINK_DNRTMSG: | |
1105 | return SECCLASS_NETLINK_DNRT_SOCKET; | |
1106 | case NETLINK_KOBJECT_UEVENT: | |
1107 | return SECCLASS_NETLINK_KOBJECT_UEVENT_SOCKET; | |
1108 | default: | |
1109 | return SECCLASS_NETLINK_SOCKET; | |
1110 | } | |
1111 | case PF_PACKET: | |
1112 | return SECCLASS_PACKET_SOCKET; | |
1113 | case PF_KEY: | |
1114 | return SECCLASS_KEY_SOCKET; | |
1115 | case PF_APPLETALK: | |
1116 | return SECCLASS_APPLETALK_SOCKET; | |
1117 | } | |
1118 | ||
1119 | return SECCLASS_SOCKET; | |
1120 | } | |
1121 | ||
1122 | #ifdef CONFIG_PROC_FS | |
1123 | static int selinux_proc_get_sid(struct proc_dir_entry *de, | |
1124 | u16 tclass, | |
1125 | u32 *sid) | |
1126 | { | |
1127 | int buflen, rc; | |
1128 | char *buffer, *path, *end; | |
1129 | ||
1130 | buffer = (char *)__get_free_page(GFP_KERNEL); | |
1131 | if (!buffer) | |
1132 | return -ENOMEM; | |
1133 | ||
1134 | buflen = PAGE_SIZE; | |
1135 | end = buffer+buflen; | |
1136 | *--end = '\0'; | |
1137 | buflen--; | |
1138 | path = end-1; | |
1139 | *path = '/'; | |
1140 | while (de && de != de->parent) { | |
1141 | buflen -= de->namelen + 1; | |
1142 | if (buflen < 0) | |
1143 | break; | |
1144 | end -= de->namelen; | |
1145 | memcpy(end, de->name, de->namelen); | |
1146 | *--end = '/'; | |
1147 | path = end; | |
1148 | de = de->parent; | |
1149 | } | |
1150 | rc = security_genfs_sid("proc", path, tclass, sid); | |
1151 | free_page((unsigned long)buffer); | |
1152 | return rc; | |
1153 | } | |
1154 | #else | |
1155 | static int selinux_proc_get_sid(struct proc_dir_entry *de, | |
1156 | u16 tclass, | |
1157 | u32 *sid) | |
1158 | { | |
1159 | return -EINVAL; | |
1160 | } | |
1161 | #endif | |
1162 | ||
1163 | /* The inode's security attributes must be initialized before first use. */ | |
1164 | static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dentry) | |
1165 | { | |
1166 | struct superblock_security_struct *sbsec = NULL; | |
1167 | struct inode_security_struct *isec = inode->i_security; | |
1168 | u32 sid; | |
1169 | struct dentry *dentry; | |
1170 | #define INITCONTEXTLEN 255 | |
1171 | char *context = NULL; | |
1172 | unsigned len = 0; | |
1173 | int rc = 0; | |
1174 | ||
1175 | if (isec->initialized) | |
1176 | goto out; | |
1177 | ||
1178 | mutex_lock(&isec->lock); | |
1179 | if (isec->initialized) | |
1180 | goto out_unlock; | |
1181 | ||
1182 | sbsec = inode->i_sb->s_security; | |
1183 | if (!(sbsec->flags & SE_SBINITIALIZED)) { | |
1184 | /* Defer initialization until selinux_complete_init, | |
1185 | after the initial policy is loaded and the security | |
1186 | server is ready to handle calls. */ | |
1187 | spin_lock(&sbsec->isec_lock); | |
1188 | if (list_empty(&isec->list)) | |
1189 | list_add(&isec->list, &sbsec->isec_head); | |
1190 | spin_unlock(&sbsec->isec_lock); | |
1191 | goto out_unlock; | |
1192 | } | |
1193 | ||
1194 | switch (sbsec->behavior) { | |
1195 | case SECURITY_FS_USE_XATTR: | |
1196 | if (!inode->i_op->getxattr) { | |
1197 | isec->sid = sbsec->def_sid; | |
1198 | break; | |
1199 | } | |
1200 | ||
1201 | /* Need a dentry, since the xattr API requires one. | |
1202 | Life would be simpler if we could just pass the inode. */ | |
1203 | if (opt_dentry) { | |
1204 | /* Called from d_instantiate or d_splice_alias. */ | |
1205 | dentry = dget(opt_dentry); | |
1206 | } else { | |
1207 | /* Called from selinux_complete_init, try to find a dentry. */ | |
1208 | dentry = d_find_alias(inode); | |
1209 | } | |
1210 | if (!dentry) { | |
1211 | /* | |
1212 | * this is can be hit on boot when a file is accessed | |
1213 | * before the policy is loaded. When we load policy we | |
1214 | * may find inodes that have no dentry on the | |
1215 | * sbsec->isec_head list. No reason to complain as these | |
1216 | * will get fixed up the next time we go through | |
1217 | * inode_doinit with a dentry, before these inodes could | |
1218 | * be used again by userspace. | |
1219 | */ | |
1220 | goto out_unlock; | |
1221 | } | |
1222 | ||
1223 | len = INITCONTEXTLEN; | |
1224 | context = kmalloc(len+1, GFP_NOFS); | |
1225 | if (!context) { | |
1226 | rc = -ENOMEM; | |
1227 | dput(dentry); | |
1228 | goto out_unlock; | |
1229 | } | |
1230 | context[len] = '\0'; | |
1231 | rc = inode->i_op->getxattr(dentry, XATTR_NAME_SELINUX, | |
1232 | context, len); | |
1233 | if (rc == -ERANGE) { | |
1234 | kfree(context); | |
1235 | ||
1236 | /* Need a larger buffer. Query for the right size. */ | |
1237 | rc = inode->i_op->getxattr(dentry, XATTR_NAME_SELINUX, | |
1238 | NULL, 0); | |
1239 | if (rc < 0) { | |
1240 | dput(dentry); | |
1241 | goto out_unlock; | |
1242 | } | |
1243 | len = rc; | |
1244 | context = kmalloc(len+1, GFP_NOFS); | |
1245 | if (!context) { | |
1246 | rc = -ENOMEM; | |
1247 | dput(dentry); | |
1248 | goto out_unlock; | |
1249 | } | |
1250 | context[len] = '\0'; | |
1251 | rc = inode->i_op->getxattr(dentry, | |
1252 | XATTR_NAME_SELINUX, | |
1253 | context, len); | |
1254 | } | |
1255 | dput(dentry); | |
1256 | if (rc < 0) { | |
1257 | if (rc != -ENODATA) { | |
1258 | printk(KERN_WARNING "SELinux: %s: getxattr returned " | |
1259 | "%d for dev=%s ino=%ld\n", __func__, | |
1260 | -rc, inode->i_sb->s_id, inode->i_ino); | |
1261 | kfree(context); | |
1262 | goto out_unlock; | |
1263 | } | |
1264 | /* Map ENODATA to the default file SID */ | |
1265 | sid = sbsec->def_sid; | |
1266 | rc = 0; | |
1267 | } else { | |
1268 | rc = security_context_to_sid_default(context, rc, &sid, | |
1269 | sbsec->def_sid, | |
1270 | GFP_NOFS); | |
1271 | if (rc) { | |
1272 | char *dev = inode->i_sb->s_id; | |
1273 | unsigned long ino = inode->i_ino; | |
1274 | ||
1275 | if (rc == -EINVAL) { | |
1276 | if (printk_ratelimit()) | |
1277 | printk(KERN_NOTICE "SELinux: inode=%lu on dev=%s was found to have an invalid " | |
1278 | "context=%s. This indicates you may need to relabel the inode or the " | |
1279 | "filesystem in question.\n", ino, dev, context); | |
1280 | } else { | |
1281 | printk(KERN_WARNING "SELinux: %s: context_to_sid(%s) " | |
1282 | "returned %d for dev=%s ino=%ld\n", | |
1283 | __func__, context, -rc, dev, ino); | |
1284 | } | |
1285 | kfree(context); | |
1286 | /* Leave with the unlabeled SID */ | |
1287 | rc = 0; | |
1288 | break; | |
1289 | } | |
1290 | } | |
1291 | kfree(context); | |
1292 | isec->sid = sid; | |
1293 | break; | |
1294 | case SECURITY_FS_USE_TASK: | |
1295 | isec->sid = isec->task_sid; | |
1296 | break; | |
1297 | case SECURITY_FS_USE_TRANS: | |
1298 | /* Default to the fs SID. */ | |
1299 | isec->sid = sbsec->sid; | |
1300 | ||
1301 | /* Try to obtain a transition SID. */ | |
1302 | isec->sclass = inode_mode_to_security_class(inode->i_mode); | |
1303 | rc = security_transition_sid(isec->task_sid, | |
1304 | sbsec->sid, | |
1305 | isec->sclass, | |
1306 | &sid); | |
1307 | if (rc) | |
1308 | goto out_unlock; | |
1309 | isec->sid = sid; | |
1310 | break; | |
1311 | case SECURITY_FS_USE_MNTPOINT: | |
1312 | isec->sid = sbsec->mntpoint_sid; | |
1313 | break; | |
1314 | default: | |
1315 | /* Default to the fs superblock SID. */ | |
1316 | isec->sid = sbsec->sid; | |
1317 | ||
1318 | if ((sbsec->flags & SE_SBPROC) && !S_ISLNK(inode->i_mode)) { | |
1319 | struct proc_inode *proci = PROC_I(inode); | |
1320 | if (proci->pde) { | |
1321 | isec->sclass = inode_mode_to_security_class(inode->i_mode); | |
1322 | rc = selinux_proc_get_sid(proci->pde, | |
1323 | isec->sclass, | |
1324 | &sid); | |
1325 | if (rc) | |
1326 | goto out_unlock; | |
1327 | isec->sid = sid; | |
1328 | } | |
1329 | } | |
1330 | break; | |
1331 | } | |
1332 | ||
1333 | isec->initialized = 1; | |
1334 | ||
1335 | out_unlock: | |
1336 | mutex_unlock(&isec->lock); | |
1337 | out: | |
1338 | if (isec->sclass == SECCLASS_FILE) | |
1339 | isec->sclass = inode_mode_to_security_class(inode->i_mode); | |
1340 | return rc; | |
1341 | } | |
1342 | ||
1343 | /* Convert a Linux signal to an access vector. */ | |
1344 | static inline u32 signal_to_av(int sig) | |
1345 | { | |
1346 | u32 perm = 0; | |
1347 | ||
1348 | switch (sig) { | |
1349 | case SIGCHLD: | |
1350 | /* Commonly granted from child to parent. */ | |
1351 | perm = PROCESS__SIGCHLD; | |
1352 | break; | |
1353 | case SIGKILL: | |
1354 | /* Cannot be caught or ignored */ | |
1355 | perm = PROCESS__SIGKILL; | |
1356 | break; | |
1357 | case SIGSTOP: | |
1358 | /* Cannot be caught or ignored */ | |
1359 | perm = PROCESS__SIGSTOP; | |
1360 | break; | |
1361 | default: | |
1362 | /* All other signals. */ | |
1363 | perm = PROCESS__SIGNAL; | |
1364 | break; | |
1365 | } | |
1366 | ||
1367 | return perm; | |
1368 | } | |
1369 | ||
1370 | /* | |
1371 | * Check permission between a pair of credentials | |
1372 | * fork check, ptrace check, etc. | |
1373 | */ | |
1374 | static int cred_has_perm(const struct cred *actor, | |
1375 | const struct cred *target, | |
1376 | u32 perms) | |
1377 | { | |
1378 | u32 asid = cred_sid(actor), tsid = cred_sid(target); | |
1379 | ||
1380 | return avc_has_perm(asid, tsid, SECCLASS_PROCESS, perms, NULL); | |
1381 | } | |
1382 | ||
1383 | /* | |
1384 | * Check permission between a pair of tasks, e.g. signal checks, | |
1385 | * fork check, ptrace check, etc. | |
1386 | * tsk1 is the actor and tsk2 is the target | |
1387 | * - this uses the default subjective creds of tsk1 | |
1388 | */ | |
1389 | static int task_has_perm(const struct task_struct *tsk1, | |
1390 | const struct task_struct *tsk2, | |
1391 | u32 perms) | |
1392 | { | |
1393 | const struct task_security_struct *__tsec1, *__tsec2; | |
1394 | u32 sid1, sid2; | |
1395 | ||
1396 | rcu_read_lock(); | |
1397 | __tsec1 = __task_cred(tsk1)->security; sid1 = __tsec1->sid; | |
1398 | __tsec2 = __task_cred(tsk2)->security; sid2 = __tsec2->sid; | |
1399 | rcu_read_unlock(); | |
1400 | return avc_has_perm(sid1, sid2, SECCLASS_PROCESS, perms, NULL); | |
1401 | } | |
1402 | ||
1403 | /* | |
1404 | * Check permission between current and another task, e.g. signal checks, | |
1405 | * fork check, ptrace check, etc. | |
1406 | * current is the actor and tsk2 is the target | |
1407 | * - this uses current's subjective creds | |
1408 | */ | |
1409 | static int current_has_perm(const struct task_struct *tsk, | |
1410 | u32 perms) | |
1411 | { | |
1412 | u32 sid, tsid; | |
1413 | ||
1414 | sid = current_sid(); | |
1415 | tsid = task_sid(tsk); | |
1416 | return avc_has_perm(sid, tsid, SECCLASS_PROCESS, perms, NULL); | |
1417 | } | |
1418 | ||
1419 | #if CAP_LAST_CAP > 63 | |
1420 | #error Fix SELinux to handle capabilities > 63. | |
1421 | #endif | |
1422 | ||
1423 | /* Check whether a task is allowed to use a capability. */ | |
1424 | static int task_has_capability(struct task_struct *tsk, | |
1425 | const struct cred *cred, | |
1426 | int cap, int audit) | |
1427 | { | |
1428 | struct common_audit_data ad; | |
1429 | struct av_decision avd; | |
1430 | u16 sclass; | |
1431 | u32 sid = cred_sid(cred); | |
1432 | u32 av = CAP_TO_MASK(cap); | |
1433 | int rc; | |
1434 | ||
1435 | COMMON_AUDIT_DATA_INIT(&ad, CAP); | |
1436 | ad.tsk = tsk; | |
1437 | ad.u.cap = cap; | |
1438 | ||
1439 | switch (CAP_TO_INDEX(cap)) { | |
1440 | case 0: | |
1441 | sclass = SECCLASS_CAPABILITY; | |
1442 | break; | |
1443 | case 1: | |
1444 | sclass = SECCLASS_CAPABILITY2; | |
1445 | break; | |
1446 | default: | |
1447 | printk(KERN_ERR | |
1448 | "SELinux: out of range capability %d\n", cap); | |
1449 | BUG(); | |
1450 | } | |
1451 | ||
1452 | rc = avc_has_perm_noaudit(sid, sid, sclass, av, 0, &avd); | |
1453 | if (audit == SECURITY_CAP_AUDIT) | |
1454 | avc_audit(sid, sid, sclass, av, &avd, rc, &ad); | |
1455 | return rc; | |
1456 | } | |
1457 | ||
1458 | /* Check whether a task is allowed to use a system operation. */ | |
1459 | static int task_has_system(struct task_struct *tsk, | |
1460 | u32 perms) | |
1461 | { | |
1462 | u32 sid = task_sid(tsk); | |
1463 | ||
1464 | return avc_has_perm(sid, SECINITSID_KERNEL, | |
1465 | SECCLASS_SYSTEM, perms, NULL); | |
1466 | } | |
1467 | ||
1468 | /* Check whether a task has a particular permission to an inode. | |
1469 | The 'adp' parameter is optional and allows other audit | |
1470 | data to be passed (e.g. the dentry). */ | |
1471 | static int inode_has_perm(const struct cred *cred, | |
1472 | struct inode *inode, | |
1473 | u32 perms, | |
1474 | struct common_audit_data *adp) | |
1475 | { | |
1476 | struct inode_security_struct *isec; | |
1477 | struct common_audit_data ad; | |
1478 | u32 sid; | |
1479 | ||
1480 | validate_creds(cred); | |
1481 | ||
1482 | if (unlikely(IS_PRIVATE(inode))) | |
1483 | return 0; | |
1484 | ||
1485 | sid = cred_sid(cred); | |
1486 | isec = inode->i_security; | |
1487 | ||
1488 | if (!adp) { | |
1489 | adp = &ad; | |
1490 | COMMON_AUDIT_DATA_INIT(&ad, FS); | |
1491 | ad.u.fs.inode = inode; | |
1492 | } | |
1493 | ||
1494 | return avc_has_perm(sid, isec->sid, isec->sclass, perms, adp); | |
1495 | } | |
1496 | ||
1497 | /* Same as inode_has_perm, but pass explicit audit data containing | |
1498 | the dentry to help the auditing code to more easily generate the | |
1499 | pathname if needed. */ | |
1500 | static inline int dentry_has_perm(const struct cred *cred, | |
1501 | struct vfsmount *mnt, | |
1502 | struct dentry *dentry, | |
1503 | u32 av) | |
1504 | { | |
1505 | struct inode *inode = dentry->d_inode; | |
1506 | struct common_audit_data ad; | |
1507 | ||
1508 | COMMON_AUDIT_DATA_INIT(&ad, FS); | |
1509 | ad.u.fs.path.mnt = mnt; | |
1510 | ad.u.fs.path.dentry = dentry; | |
1511 | return inode_has_perm(cred, inode, av, &ad); | |
1512 | } | |
1513 | ||
1514 | /* Check whether a task can use an open file descriptor to | |
1515 | access an inode in a given way. Check access to the | |
1516 | descriptor itself, and then use dentry_has_perm to | |
1517 | check a particular permission to the file. | |
1518 | Access to the descriptor is implicitly granted if it | |
1519 | has the same SID as the process. If av is zero, then | |
1520 | access to the file is not checked, e.g. for cases | |
1521 | where only the descriptor is affected like seek. */ | |
1522 | static int file_has_perm(const struct cred *cred, | |
1523 | struct file *file, | |
1524 | u32 av) | |
1525 | { | |
1526 | struct file_security_struct *fsec = file->f_security; | |
1527 | struct inode *inode = file->f_path.dentry->d_inode; | |
1528 | struct common_audit_data ad; | |
1529 | u32 sid = cred_sid(cred); | |
1530 | int rc; | |
1531 | ||
1532 | COMMON_AUDIT_DATA_INIT(&ad, FS); | |
1533 | ad.u.fs.path = file->f_path; | |
1534 | ||
1535 | if (sid != fsec->sid) { | |
1536 | rc = avc_has_perm(sid, fsec->sid, | |
1537 | SECCLASS_FD, | |
1538 | FD__USE, | |
1539 | &ad); | |
1540 | if (rc) | |
1541 | goto out; | |
1542 | } | |
1543 | ||
1544 | /* av is zero if only checking access to the descriptor. */ | |
1545 | rc = 0; | |
1546 | if (av) | |
1547 | rc = inode_has_perm(cred, inode, av, &ad); | |
1548 | ||
1549 | out: | |
1550 | return rc; | |
1551 | } | |
1552 | ||
1553 | /* Check whether a task can create a file. */ | |
1554 | static int may_create(struct inode *dir, | |
1555 | struct dentry *dentry, | |
1556 | u16 tclass) | |
1557 | { | |
1558 | const struct task_security_struct *tsec = current_security(); | |
1559 | struct inode_security_struct *dsec; | |
1560 | struct superblock_security_struct *sbsec; | |
1561 | u32 sid, newsid; | |
1562 | struct common_audit_data ad; | |
1563 | int rc; | |
1564 | ||
1565 | dsec = dir->i_security; | |
1566 | sbsec = dir->i_sb->s_security; | |
1567 | ||
1568 | sid = tsec->sid; | |
1569 | newsid = tsec->create_sid; | |
1570 | ||
1571 | COMMON_AUDIT_DATA_INIT(&ad, FS); | |
1572 | ad.u.fs.path.dentry = dentry; | |
1573 | ||
1574 | rc = avc_has_perm(sid, dsec->sid, SECCLASS_DIR, | |
1575 | DIR__ADD_NAME | DIR__SEARCH, | |
1576 | &ad); | |
1577 | if (rc) | |
1578 | return rc; | |
1579 | ||
1580 | if (!newsid || !(sbsec->flags & SE_SBLABELSUPP)) { | |
1581 | rc = security_transition_sid(sid, dsec->sid, tclass, &newsid); | |
1582 | if (rc) | |
1583 | return rc; | |
1584 | } | |
1585 | ||
1586 | rc = avc_has_perm(sid, newsid, tclass, FILE__CREATE, &ad); | |
1587 | if (rc) | |
1588 | return rc; | |
1589 | ||
1590 | return avc_has_perm(newsid, sbsec->sid, | |
1591 | SECCLASS_FILESYSTEM, | |
1592 | FILESYSTEM__ASSOCIATE, &ad); | |
1593 | } | |
1594 | ||
1595 | /* Check whether a task can create a key. */ | |
1596 | static int may_create_key(u32 ksid, | |
1597 | struct task_struct *ctx) | |
1598 | { | |
1599 | u32 sid = task_sid(ctx); | |
1600 | ||
1601 | return avc_has_perm(sid, ksid, SECCLASS_KEY, KEY__CREATE, NULL); | |
1602 | } | |
1603 | ||
1604 | #define MAY_LINK 0 | |
1605 | #define MAY_UNLINK 1 | |
1606 | #define MAY_RMDIR 2 | |
1607 | ||
1608 | /* Check whether a task can link, unlink, or rmdir a file/directory. */ | |
1609 | static int may_link(struct inode *dir, | |
1610 | struct dentry *dentry, | |
1611 | int kind) | |
1612 | ||
1613 | { | |
1614 | struct inode_security_struct *dsec, *isec; | |
1615 | struct common_audit_data ad; | |
1616 | u32 sid = current_sid(); | |
1617 | u32 av; | |
1618 | int rc; | |
1619 | ||
1620 | dsec = dir->i_security; | |
1621 | isec = dentry->d_inode->i_security; | |
1622 | ||
1623 | COMMON_AUDIT_DATA_INIT(&ad, FS); | |
1624 | ad.u.fs.path.dentry = dentry; | |
1625 | ||
1626 | av = DIR__SEARCH; | |
1627 | av |= (kind ? DIR__REMOVE_NAME : DIR__ADD_NAME); | |
1628 | rc = avc_has_perm(sid, dsec->sid, SECCLASS_DIR, av, &ad); | |
1629 | if (rc) | |
1630 | return rc; | |
1631 | ||
1632 | switch (kind) { | |
1633 | case MAY_LINK: | |
1634 | av = FILE__LINK; | |
1635 | break; | |
1636 | case MAY_UNLINK: | |
1637 | av = FILE__UNLINK; | |
1638 | break; | |
1639 | case MAY_RMDIR: | |
1640 | av = DIR__RMDIR; | |
1641 | break; | |
1642 | default: | |
1643 | printk(KERN_WARNING "SELinux: %s: unrecognized kind %d\n", | |
1644 | __func__, kind); | |
1645 | return 0; | |
1646 | } | |
1647 | ||
1648 | rc = avc_has_perm(sid, isec->sid, isec->sclass, av, &ad); | |
1649 | return rc; | |
1650 | } | |
1651 | ||
1652 | static inline int may_rename(struct inode *old_dir, | |
1653 | struct dentry *old_dentry, | |
1654 | struct inode *new_dir, | |
1655 | struct dentry *new_dentry) | |
1656 | { | |
1657 | struct inode_security_struct *old_dsec, *new_dsec, *old_isec, *new_isec; | |
1658 | struct common_audit_data ad; | |
1659 | u32 sid = current_sid(); | |
1660 | u32 av; | |
1661 | int old_is_dir, new_is_dir; | |
1662 | int rc; | |
1663 | ||
1664 | old_dsec = old_dir->i_security; | |
1665 | old_isec = old_dentry->d_inode->i_security; | |
1666 | old_is_dir = S_ISDIR(old_dentry->d_inode->i_mode); | |
1667 | new_dsec = new_dir->i_security; | |
1668 | ||
1669 | COMMON_AUDIT_DATA_INIT(&ad, FS); | |
1670 | ||
1671 | ad.u.fs.path.dentry = old_dentry; | |
1672 | rc = avc_has_perm(sid, old_dsec->sid, SECCLASS_DIR, | |
1673 | DIR__REMOVE_NAME | DIR__SEARCH, &ad); | |
1674 | if (rc) | |
1675 | return rc; | |
1676 | rc = avc_has_perm(sid, old_isec->sid, | |
1677 | old_isec->sclass, FILE__RENAME, &ad); | |
1678 | if (rc) | |
1679 | return rc; | |
1680 | if (old_is_dir && new_dir != old_dir) { | |
1681 | rc = avc_has_perm(sid, old_isec->sid, | |
1682 | old_isec->sclass, DIR__REPARENT, &ad); | |
1683 | if (rc) | |
1684 | return rc; | |
1685 | } | |
1686 | ||
1687 | ad.u.fs.path.dentry = new_dentry; | |
1688 | av = DIR__ADD_NAME | DIR__SEARCH; | |
1689 | if (new_dentry->d_inode) | |
1690 | av |= DIR__REMOVE_NAME; | |
1691 | rc = avc_has_perm(sid, new_dsec->sid, SECCLASS_DIR, av, &ad); | |
1692 | if (rc) | |
1693 | return rc; | |
1694 | if (new_dentry->d_inode) { | |
1695 | new_isec = new_dentry->d_inode->i_security; | |
1696 | new_is_dir = S_ISDIR(new_dentry->d_inode->i_mode); | |
1697 | rc = avc_has_perm(sid, new_isec->sid, | |
1698 | new_isec->sclass, | |
1699 | (new_is_dir ? DIR__RMDIR : FILE__UNLINK), &ad); | |
1700 | if (rc) | |
1701 | return rc; | |
1702 | } | |
1703 | ||
1704 | return 0; | |
1705 | } | |
1706 | ||
1707 | /* Check whether a task can perform a filesystem operation. */ | |
1708 | static int superblock_has_perm(const struct cred *cred, | |
1709 | struct super_block *sb, | |
1710 | u32 perms, | |
1711 | struct common_audit_data *ad) | |
1712 | { | |
1713 | struct superblock_security_struct *sbsec; | |
1714 | u32 sid = cred_sid(cred); | |
1715 | ||
1716 | sbsec = sb->s_security; | |
1717 | return avc_has_perm(sid, sbsec->sid, SECCLASS_FILESYSTEM, perms, ad); | |
1718 | } | |
1719 | ||
1720 | /* Convert a Linux mode and permission mask to an access vector. */ | |
1721 | static inline u32 file_mask_to_av(int mode, int mask) | |
1722 | { | |
1723 | u32 av = 0; | |
1724 | ||
1725 | if ((mode & S_IFMT) != S_IFDIR) { | |
1726 | if (mask & MAY_EXEC) | |
1727 | av |= FILE__EXECUTE; | |
1728 | if (mask & MAY_READ) | |
1729 | av |= FILE__READ; | |
1730 | ||
1731 | if (mask & MAY_APPEND) | |
1732 | av |= FILE__APPEND; | |
1733 | else if (mask & MAY_WRITE) | |
1734 | av |= FILE__WRITE; | |
1735 | ||
1736 | } else { | |
1737 | if (mask & MAY_EXEC) | |
1738 | av |= DIR__SEARCH; | |
1739 | if (mask & MAY_WRITE) | |
1740 | av |= DIR__WRITE; | |
1741 | if (mask & MAY_READ) | |
1742 | av |= DIR__READ; | |
1743 | } | |
1744 | ||
1745 | return av; | |
1746 | } | |
1747 | ||
1748 | /* Convert a Linux file to an access vector. */ | |
1749 | static inline u32 file_to_av(struct file *file) | |
1750 | { | |
1751 | u32 av = 0; | |
1752 | ||
1753 | if (file->f_mode & FMODE_READ) | |
1754 | av |= FILE__READ; | |
1755 | if (file->f_mode & FMODE_WRITE) { | |
1756 | if (file->f_flags & O_APPEND) | |
1757 | av |= FILE__APPEND; | |
1758 | else | |
1759 | av |= FILE__WRITE; | |
1760 | } | |
1761 | if (!av) { | |
1762 | /* | |
1763 | * Special file opened with flags 3 for ioctl-only use. | |
1764 | */ | |
1765 | av = FILE__IOCTL; | |
1766 | } | |
1767 | ||
1768 | return av; | |
1769 | } | |
1770 | ||
1771 | /* | |
1772 | * Convert a file to an access vector and include the correct open | |
1773 | * open permission. | |
1774 | */ | |
1775 | static inline u32 open_file_to_av(struct file *file) | |
1776 | { | |
1777 | u32 av = file_to_av(file); | |
1778 | ||
1779 | if (selinux_policycap_openperm) | |
1780 | av |= FILE__OPEN; | |
1781 | ||
1782 | return av; | |
1783 | } | |
1784 | ||
1785 | /* Hook functions begin here. */ | |
1786 | ||
1787 | static int selinux_ptrace_access_check(struct task_struct *child, | |
1788 | unsigned int mode) | |
1789 | { | |
1790 | int rc; | |
1791 | ||
1792 | rc = cap_ptrace_access_check(child, mode); | |
1793 | if (rc) | |
1794 | return rc; | |
1795 | ||
1796 | if (mode == PTRACE_MODE_READ) { | |
1797 | u32 sid = current_sid(); | |
1798 | u32 csid = task_sid(child); | |
1799 | return avc_has_perm(sid, csid, SECCLASS_FILE, FILE__READ, NULL); | |
1800 | } | |
1801 | ||
1802 | return current_has_perm(child, PROCESS__PTRACE); | |
1803 | } | |
1804 | ||
1805 | static int selinux_ptrace_traceme(struct task_struct *parent) | |
1806 | { | |
1807 | int rc; | |
1808 | ||
1809 | rc = cap_ptrace_traceme(parent); | |
1810 | if (rc) | |
1811 | return rc; | |
1812 | ||
1813 | return task_has_perm(parent, current, PROCESS__PTRACE); | |
1814 | } | |
1815 | ||
1816 | static int selinux_capget(struct task_struct *target, kernel_cap_t *effective, | |
1817 | kernel_cap_t *inheritable, kernel_cap_t *permitted) | |
1818 | { | |
1819 | int error; | |
1820 | ||
1821 | error = current_has_perm(target, PROCESS__GETCAP); | |
1822 | if (error) | |
1823 | return error; | |
1824 | ||
1825 | return cap_capget(target, effective, inheritable, permitted); | |
1826 | } | |
1827 | ||
1828 | static int selinux_capset(struct cred *new, const struct cred *old, | |
1829 | const kernel_cap_t *effective, | |
1830 | const kernel_cap_t *inheritable, | |
1831 | const kernel_cap_t *permitted) | |
1832 | { | |
1833 | int error; | |
1834 | ||
1835 | error = cap_capset(new, old, | |
1836 | effective, inheritable, permitted); | |
1837 | if (error) | |
1838 | return error; | |
1839 | ||
1840 | return cred_has_perm(old, new, PROCESS__SETCAP); | |
1841 | } | |
1842 | ||
1843 | /* | |
1844 | * (This comment used to live with the selinux_task_setuid hook, | |
1845 | * which was removed). | |
1846 | * | |
1847 | * Since setuid only affects the current process, and since the SELinux | |
1848 | * controls are not based on the Linux identity attributes, SELinux does not | |
1849 | * need to control this operation. However, SELinux does control the use of | |
1850 | * the CAP_SETUID and CAP_SETGID capabilities using the capable hook. | |
1851 | */ | |
1852 | ||
1853 | static int selinux_capable(struct task_struct *tsk, const struct cred *cred, | |
1854 | int cap, int audit) | |
1855 | { | |
1856 | int rc; | |
1857 | ||
1858 | rc = cap_capable(tsk, cred, cap, audit); | |
1859 | if (rc) | |
1860 | return rc; | |
1861 | ||
1862 | return task_has_capability(tsk, cred, cap, audit); | |
1863 | } | |
1864 | ||
1865 | static int selinux_sysctl_get_sid(ctl_table *table, u16 tclass, u32 *sid) | |
1866 | { | |
1867 | int buflen, rc; | |
1868 | char *buffer, *path, *end; | |
1869 | ||
1870 | rc = -ENOMEM; | |
1871 | buffer = (char *)__get_free_page(GFP_KERNEL); | |
1872 | if (!buffer) | |
1873 | goto out; | |
1874 | ||
1875 | buflen = PAGE_SIZE; | |
1876 | end = buffer+buflen; | |
1877 | *--end = '\0'; | |
1878 | buflen--; | |
1879 | path = end-1; | |
1880 | *path = '/'; | |
1881 | while (table) { | |
1882 | const char *name = table->procname; | |
1883 | size_t namelen = strlen(name); | |
1884 | buflen -= namelen + 1; | |
1885 | if (buflen < 0) | |
1886 | goto out_free; | |
1887 | end -= namelen; | |
1888 | memcpy(end, name, namelen); | |
1889 | *--end = '/'; | |
1890 | path = end; | |
1891 | table = table->parent; | |
1892 | } | |
1893 | buflen -= 4; | |
1894 | if (buflen < 0) | |
1895 | goto out_free; | |
1896 | end -= 4; | |
1897 | memcpy(end, "/sys", 4); | |
1898 | path = end; | |
1899 | rc = security_genfs_sid("proc", path, tclass, sid); | |
1900 | out_free: | |
1901 | free_page((unsigned long)buffer); | |
1902 | out: | |
1903 | return rc; | |
1904 | } | |
1905 | ||
1906 | static int selinux_sysctl(ctl_table *table, int op) | |
1907 | { | |
1908 | int error = 0; | |
1909 | u32 av; | |
1910 | u32 tsid, sid; | |
1911 | int rc; | |
1912 | ||
1913 | sid = current_sid(); | |
1914 | ||
1915 | rc = selinux_sysctl_get_sid(table, (op == 0001) ? | |
1916 | SECCLASS_DIR : SECCLASS_FILE, &tsid); | |
1917 | if (rc) { | |
1918 | /* Default to the well-defined sysctl SID. */ | |
1919 | tsid = SECINITSID_SYSCTL; | |
1920 | } | |
1921 | ||
1922 | /* The op values are "defined" in sysctl.c, thereby creating | |
1923 | * a bad coupling between this module and sysctl.c */ | |
1924 | if (op == 001) { | |
1925 | error = avc_has_perm(sid, tsid, | |
1926 | SECCLASS_DIR, DIR__SEARCH, NULL); | |
1927 | } else { | |
1928 | av = 0; | |
1929 | if (op & 004) | |
1930 | av |= FILE__READ; | |
1931 | if (op & 002) | |
1932 | av |= FILE__WRITE; | |
1933 | if (av) | |
1934 | error = avc_has_perm(sid, tsid, | |
1935 | SECCLASS_FILE, av, NULL); | |
1936 | } | |
1937 | ||
1938 | return error; | |
1939 | } | |
1940 | ||
1941 | static int selinux_quotactl(int cmds, int type, int id, struct super_block *sb) | |
1942 | { | |
1943 | const struct cred *cred = current_cred(); | |
1944 | int rc = 0; | |
1945 | ||
1946 | if (!sb) | |
1947 | return 0; | |
1948 | ||
1949 | switch (cmds) { | |
1950 | case Q_SYNC: | |
1951 | case Q_QUOTAON: | |
1952 | case Q_QUOTAOFF: | |
1953 | case Q_SETINFO: | |
1954 | case Q_SETQUOTA: | |
1955 | rc = superblock_has_perm(cred, sb, FILESYSTEM__QUOTAMOD, NULL); | |
1956 | break; | |
1957 | case Q_GETFMT: | |
1958 | case Q_GETINFO: | |
1959 | case Q_GETQUOTA: | |
1960 | rc = superblock_has_perm(cred, sb, FILESYSTEM__QUOTAGET, NULL); | |
1961 | break; | |
1962 | default: | |
1963 | rc = 0; /* let the kernel handle invalid cmds */ | |
1964 | break; | |
1965 | } | |
1966 | return rc; | |
1967 | } | |
1968 | ||
1969 | static int selinux_quota_on(struct dentry *dentry) | |
1970 | { | |
1971 | const struct cred *cred = current_cred(); | |
1972 | ||
1973 | return dentry_has_perm(cred, NULL, dentry, FILE__QUOTAON); | |
1974 | } | |
1975 | ||
1976 | static int selinux_syslog(int type, bool from_file) | |
1977 | { | |
1978 | int rc; | |
1979 | ||
1980 | rc = cap_syslog(type, from_file); | |
1981 | if (rc) | |
1982 | return rc; | |
1983 | ||
1984 | switch (type) { | |
1985 | case SYSLOG_ACTION_READ_ALL: /* Read last kernel messages */ | |
1986 | case SYSLOG_ACTION_SIZE_BUFFER: /* Return size of the log buffer */ | |
1987 | rc = task_has_system(current, SYSTEM__SYSLOG_READ); | |
1988 | break; | |
1989 | case SYSLOG_ACTION_CONSOLE_OFF: /* Disable logging to console */ | |
1990 | case SYSLOG_ACTION_CONSOLE_ON: /* Enable logging to console */ | |
1991 | /* Set level of messages printed to console */ | |
1992 | case SYSLOG_ACTION_CONSOLE_LEVEL: | |
1993 | rc = task_has_system(current, SYSTEM__SYSLOG_CONSOLE); | |
1994 | break; | |
1995 | case SYSLOG_ACTION_CLOSE: /* Close log */ | |
1996 | case SYSLOG_ACTION_OPEN: /* Open log */ | |
1997 | case SYSLOG_ACTION_READ: /* Read from log */ | |
1998 | case SYSLOG_ACTION_READ_CLEAR: /* Read/clear last kernel messages */ | |
1999 | case SYSLOG_ACTION_CLEAR: /* Clear ring buffer */ | |
2000 | default: | |
2001 | rc = task_has_system(current, SYSTEM__SYSLOG_MOD); | |
2002 | break; | |
2003 | } | |
2004 | return rc; | |
2005 | } | |
2006 | ||
2007 | /* | |
2008 | * Check that a process has enough memory to allocate a new virtual | |
2009 | * mapping. 0 means there is enough memory for the allocation to | |
2010 | * succeed and -ENOMEM implies there is not. | |
2011 | * | |
2012 | * Do not audit the selinux permission check, as this is applied to all | |
2013 | * processes that allocate mappings. | |
2014 | */ | |
2015 | static int selinux_vm_enough_memory(struct mm_struct *mm, long pages) | |
2016 | { | |
2017 | int rc, cap_sys_admin = 0; | |
2018 | ||
2019 | rc = selinux_capable(current, current_cred(), CAP_SYS_ADMIN, | |
2020 | SECURITY_CAP_NOAUDIT); | |
2021 | if (rc == 0) | |
2022 | cap_sys_admin = 1; | |
2023 | ||
2024 | return __vm_enough_memory(mm, pages, cap_sys_admin); | |
2025 | } | |
2026 | ||
2027 | /* binprm security operations */ | |
2028 | ||
2029 | static int selinux_bprm_set_creds(struct linux_binprm *bprm) | |
2030 | { | |
2031 | const struct task_security_struct *old_tsec; | |
2032 | struct task_security_struct *new_tsec; | |
2033 | struct inode_security_struct *isec; | |
2034 | struct common_audit_data ad; | |
2035 | struct inode *inode = bprm->file->f_path.dentry->d_inode; | |
2036 | int rc; | |
2037 | ||
2038 | rc = cap_bprm_set_creds(bprm); | |
2039 | if (rc) | |
2040 | return rc; | |
2041 | ||
2042 | /* SELinux context only depends on initial program or script and not | |
2043 | * the script interpreter */ | |
2044 | if (bprm->cred_prepared) | |
2045 | return 0; | |
2046 | ||
2047 | old_tsec = current_security(); | |
2048 | new_tsec = bprm->cred->security; | |
2049 | isec = inode->i_security; | |
2050 | ||
2051 | /* Default to the current task SID. */ | |
2052 | new_tsec->sid = old_tsec->sid; | |
2053 | new_tsec->osid = old_tsec->sid; | |
2054 | ||
2055 | /* Reset fs, key, and sock SIDs on execve. */ | |
2056 | new_tsec->create_sid = 0; | |
2057 | new_tsec->keycreate_sid = 0; | |
2058 | new_tsec->sockcreate_sid = 0; | |
2059 | ||
2060 | if (old_tsec->exec_sid) { | |
2061 | new_tsec->sid = old_tsec->exec_sid; | |
2062 | /* Reset exec SID on execve. */ | |
2063 | new_tsec->exec_sid = 0; | |
2064 | } else { | |
2065 | /* Check for a default transition on this program. */ | |
2066 | rc = security_transition_sid(old_tsec->sid, isec->sid, | |
2067 | SECCLASS_PROCESS, &new_tsec->sid); | |
2068 | if (rc) | |
2069 | return rc; | |
2070 | } | |
2071 | ||
2072 | COMMON_AUDIT_DATA_INIT(&ad, FS); | |
2073 | ad.u.fs.path = bprm->file->f_path; | |
2074 | ||
2075 | if (bprm->file->f_path.mnt->mnt_flags & MNT_NOSUID) | |
2076 | new_tsec->sid = old_tsec->sid; | |
2077 | ||
2078 | if (new_tsec->sid == old_tsec->sid) { | |
2079 | rc = avc_has_perm(old_tsec->sid, isec->sid, | |
2080 | SECCLASS_FILE, FILE__EXECUTE_NO_TRANS, &ad); | |
2081 | if (rc) | |
2082 | return rc; | |
2083 | } else { | |
2084 | /* Check permissions for the transition. */ | |
2085 | rc = avc_has_perm(old_tsec->sid, new_tsec->sid, | |
2086 | SECCLASS_PROCESS, PROCESS__TRANSITION, &ad); | |
2087 | if (rc) | |
2088 | return rc; | |
2089 | ||
2090 | rc = avc_has_perm(new_tsec->sid, isec->sid, | |
2091 | SECCLASS_FILE, FILE__ENTRYPOINT, &ad); | |
2092 | if (rc) | |
2093 | return rc; | |
2094 | ||
2095 | /* Check for shared state */ | |
2096 | if (bprm->unsafe & LSM_UNSAFE_SHARE) { | |
2097 | rc = avc_has_perm(old_tsec->sid, new_tsec->sid, | |
2098 | SECCLASS_PROCESS, PROCESS__SHARE, | |
2099 | NULL); | |
2100 | if (rc) | |
2101 | return -EPERM; | |
2102 | } | |
2103 | ||
2104 | /* Make sure that anyone attempting to ptrace over a task that | |
2105 | * changes its SID has the appropriate permit */ | |
2106 | if (bprm->unsafe & | |
2107 | (LSM_UNSAFE_PTRACE | LSM_UNSAFE_PTRACE_CAP)) { | |
2108 | struct task_struct *tracer; | |
2109 | struct task_security_struct *sec; | |
2110 | u32 ptsid = 0; | |
2111 | ||
2112 | rcu_read_lock(); | |
2113 | tracer = tracehook_tracer_task(current); | |
2114 | if (likely(tracer != NULL)) { | |
2115 | sec = __task_cred(tracer)->security; | |
2116 | ptsid = sec->sid; | |
2117 | } | |
2118 | rcu_read_unlock(); | |
2119 | ||
2120 | if (ptsid != 0) { | |
2121 | rc = avc_has_perm(ptsid, new_tsec->sid, | |
2122 | SECCLASS_PROCESS, | |
2123 | PROCESS__PTRACE, NULL); | |
2124 | if (rc) | |
2125 | return -EPERM; | |
2126 | } | |
2127 | } | |
2128 | ||
2129 | /* Clear any possibly unsafe personality bits on exec: */ | |
2130 | bprm->per_clear |= PER_CLEAR_ON_SETID; | |
2131 | } | |
2132 | ||
2133 | return 0; | |
2134 | } | |
2135 | ||
2136 | static int selinux_bprm_secureexec(struct linux_binprm *bprm) | |
2137 | { | |
2138 | const struct task_security_struct *tsec = current_security(); | |
2139 | u32 sid, osid; | |
2140 | int atsecure = 0; | |
2141 | ||
2142 | sid = tsec->sid; | |
2143 | osid = tsec->osid; | |
2144 | ||
2145 | if (osid != sid) { | |
2146 | /* Enable secure mode for SIDs transitions unless | |
2147 | the noatsecure permission is granted between | |
2148 | the two SIDs, i.e. ahp returns 0. */ | |
2149 | atsecure = avc_has_perm(osid, sid, | |
2150 | SECCLASS_PROCESS, | |
2151 | PROCESS__NOATSECURE, NULL); | |
2152 | } | |
2153 | ||
2154 | return (atsecure || cap_bprm_secureexec(bprm)); | |
2155 | } | |
2156 | ||
2157 | extern struct vfsmount *selinuxfs_mount; | |
2158 | extern struct dentry *selinux_null; | |
2159 | ||
2160 | /* Derived from fs/exec.c:flush_old_files. */ | |
2161 | static inline void flush_unauthorized_files(const struct cred *cred, | |
2162 | struct files_struct *files) | |
2163 | { | |
2164 | struct common_audit_data ad; | |
2165 | struct file *file, *devnull = NULL; | |
2166 | struct tty_struct *tty; | |
2167 | struct fdtable *fdt; | |
2168 | long j = -1; | |
2169 | int drop_tty = 0; | |
2170 | ||
2171 | tty = get_current_tty(); | |
2172 | if (tty) { | |
2173 | spin_lock(&tty_files_lock); | |
2174 | if (!list_empty(&tty->tty_files)) { | |
2175 | struct tty_file_private *file_priv; | |
2176 | struct inode *inode; | |
2177 | ||
2178 | /* Revalidate access to controlling tty. | |
2179 | Use inode_has_perm on the tty inode directly rather | |
2180 | than using file_has_perm, as this particular open | |
2181 | file may belong to another process and we are only | |
2182 | interested in the inode-based check here. */ | |
2183 | file_priv = list_first_entry(&tty->tty_files, | |
2184 | struct tty_file_private, list); | |
2185 | file = file_priv->file; | |
2186 | inode = file->f_path.dentry->d_inode; | |
2187 | if (inode_has_perm(cred, inode, | |
2188 | FILE__READ | FILE__WRITE, NULL)) { | |
2189 | drop_tty = 1; | |
2190 | } | |
2191 | } | |
2192 | spin_unlock(&tty_files_lock); | |
2193 | tty_kref_put(tty); | |
2194 | } | |
2195 | /* Reset controlling tty. */ | |
2196 | if (drop_tty) | |
2197 | no_tty(); | |
2198 | ||
2199 | /* Revalidate access to inherited open files. */ | |
2200 | ||
2201 | COMMON_AUDIT_DATA_INIT(&ad, FS); | |
2202 | ||
2203 | spin_lock(&files->file_lock); | |
2204 | for (;;) { | |
2205 | unsigned long set, i; | |
2206 | int fd; | |
2207 | ||
2208 | j++; | |
2209 | i = j * __NFDBITS; | |
2210 | fdt = files_fdtable(files); | |
2211 | if (i >= fdt->max_fds) | |
2212 | break; | |
2213 | set = fdt->open_fds->fds_bits[j]; | |
2214 | if (!set) | |
2215 | continue; | |
2216 | spin_unlock(&files->file_lock); | |
2217 | for ( ; set ; i++, set >>= 1) { | |
2218 | if (set & 1) { | |
2219 | file = fget(i); | |
2220 | if (!file) | |
2221 | continue; | |
2222 | if (file_has_perm(cred, | |
2223 | file, | |
2224 | file_to_av(file))) { | |
2225 | sys_close(i); | |
2226 | fd = get_unused_fd(); | |
2227 | if (fd != i) { | |
2228 | if (fd >= 0) | |
2229 | put_unused_fd(fd); | |
2230 | fput(file); | |
2231 | continue; | |
2232 | } | |
2233 | if (devnull) { | |
2234 | get_file(devnull); | |
2235 | } else { | |
2236 | devnull = dentry_open( | |
2237 | dget(selinux_null), | |
2238 | mntget(selinuxfs_mount), | |
2239 | O_RDWR, cred); | |
2240 | if (IS_ERR(devnull)) { | |
2241 | devnull = NULL; | |
2242 | put_unused_fd(fd); | |
2243 | fput(file); | |
2244 | continue; | |
2245 | } | |
2246 | } | |
2247 | fd_install(fd, devnull); | |
2248 | } | |
2249 | fput(file); | |
2250 | } | |
2251 | } | |
2252 | spin_lock(&files->file_lock); | |
2253 | ||
2254 | } | |
2255 | spin_unlock(&files->file_lock); | |
2256 | } | |
2257 | ||
2258 | /* | |
2259 | * Prepare a process for imminent new credential changes due to exec | |
2260 | */ | |
2261 | static void selinux_bprm_committing_creds(struct linux_binprm *bprm) | |
2262 | { | |
2263 | struct task_security_struct *new_tsec; | |
2264 | struct rlimit *rlim, *initrlim; | |
2265 | int rc, i; | |
2266 | ||
2267 | new_tsec = bprm->cred->security; | |
2268 | if (new_tsec->sid == new_tsec->osid) | |
2269 | return; | |
2270 | ||
2271 | /* Close files for which the new task SID is not authorized. */ | |
2272 | flush_unauthorized_files(bprm->cred, current->files); | |
2273 | ||
2274 | /* Always clear parent death signal on SID transitions. */ | |
2275 | current->pdeath_signal = 0; | |
2276 | ||
2277 | /* Check whether the new SID can inherit resource limits from the old | |
2278 | * SID. If not, reset all soft limits to the lower of the current | |
2279 | * task's hard limit and the init task's soft limit. | |
2280 | * | |
2281 | * Note that the setting of hard limits (even to lower them) can be | |
2282 | * controlled by the setrlimit check. The inclusion of the init task's | |
2283 | * soft limit into the computation is to avoid resetting soft limits | |
2284 | * higher than the default soft limit for cases where the default is | |
2285 | * lower than the hard limit, e.g. RLIMIT_CORE or RLIMIT_STACK. | |
2286 | */ | |
2287 | rc = avc_has_perm(new_tsec->osid, new_tsec->sid, SECCLASS_PROCESS, | |
2288 | PROCESS__RLIMITINH, NULL); | |
2289 | if (rc) { | |
2290 | /* protect against do_prlimit() */ | |
2291 | task_lock(current); | |
2292 | for (i = 0; i < RLIM_NLIMITS; i++) { | |
2293 | rlim = current->signal->rlim + i; | |
2294 | initrlim = init_task.signal->rlim + i; | |
2295 | rlim->rlim_cur = min(rlim->rlim_max, initrlim->rlim_cur); | |
2296 | } | |
2297 | task_unlock(current); | |
2298 | update_rlimit_cpu(current, rlimit(RLIMIT_CPU)); | |
2299 | } | |
2300 | } | |
2301 | ||
2302 | /* | |
2303 | * Clean up the process immediately after the installation of new credentials | |
2304 | * due to exec | |
2305 | */ | |
2306 | static void selinux_bprm_committed_creds(struct linux_binprm *bprm) | |
2307 | { | |
2308 | const struct task_security_struct *tsec = current_security(); | |
2309 | struct itimerval itimer; | |
2310 | u32 osid, sid; | |
2311 | int rc, i; | |
2312 | ||
2313 | osid = tsec->osid; | |
2314 | sid = tsec->sid; | |
2315 | ||
2316 | if (sid == osid) | |
2317 | return; | |
2318 | ||
2319 | /* Check whether the new SID can inherit signal state from the old SID. | |
2320 | * If not, clear itimers to avoid subsequent signal generation and | |
2321 | * flush and unblock signals. | |
2322 | * | |
2323 | * This must occur _after_ the task SID has been updated so that any | |
2324 | * kill done after the flush will be checked against the new SID. | |
2325 | */ | |
2326 | rc = avc_has_perm(osid, sid, SECCLASS_PROCESS, PROCESS__SIGINH, NULL); | |
2327 | if (rc) { | |
2328 | memset(&itimer, 0, sizeof itimer); | |
2329 | for (i = 0; i < 3; i++) | |
2330 | do_setitimer(i, &itimer, NULL); | |
2331 | spin_lock_irq(¤t->sighand->siglock); | |
2332 | if (!(current->signal->flags & SIGNAL_GROUP_EXIT)) { | |
2333 | __flush_signals(current); | |
2334 | flush_signal_handlers(current, 1); | |
2335 | sigemptyset(¤t->blocked); | |
2336 | } | |
2337 | spin_unlock_irq(¤t->sighand->siglock); | |
2338 | } | |
2339 | ||
2340 | /* Wake up the parent if it is waiting so that it can recheck | |
2341 | * wait permission to the new task SID. */ | |
2342 | read_lock(&tasklist_lock); | |
2343 | __wake_up_parent(current, current->real_parent); | |
2344 | read_unlock(&tasklist_lock); | |
2345 | } | |
2346 | ||
2347 | /* superblock security operations */ | |
2348 | ||
2349 | static int selinux_sb_alloc_security(struct super_block *sb) | |
2350 | { | |
2351 | return superblock_alloc_security(sb); | |
2352 | } | |
2353 | ||
2354 | static void selinux_sb_free_security(struct super_block *sb) | |
2355 | { | |
2356 | superblock_free_security(sb); | |
2357 | } | |
2358 | ||
2359 | static inline int match_prefix(char *prefix, int plen, char *option, int olen) | |
2360 | { | |
2361 | if (plen > olen) | |
2362 | return 0; | |
2363 | ||
2364 | return !memcmp(prefix, option, plen); | |
2365 | } | |
2366 | ||
2367 | static inline int selinux_option(char *option, int len) | |
2368 | { | |
2369 | return (match_prefix(CONTEXT_STR, sizeof(CONTEXT_STR)-1, option, len) || | |
2370 | match_prefix(FSCONTEXT_STR, sizeof(FSCONTEXT_STR)-1, option, len) || | |
2371 | match_prefix(DEFCONTEXT_STR, sizeof(DEFCONTEXT_STR)-1, option, len) || | |
2372 | match_prefix(ROOTCONTEXT_STR, sizeof(ROOTCONTEXT_STR)-1, option, len) || | |
2373 | match_prefix(LABELSUPP_STR, sizeof(LABELSUPP_STR)-1, option, len)); | |
2374 | } | |
2375 | ||
2376 | static inline void take_option(char **to, char *from, int *first, int len) | |
2377 | { | |
2378 | if (!*first) { | |
2379 | **to = ','; | |
2380 | *to += 1; | |
2381 | } else | |
2382 | *first = 0; | |
2383 | memcpy(*to, from, len); | |
2384 | *to += len; | |
2385 | } | |
2386 | ||
2387 | static inline void take_selinux_option(char **to, char *from, int *first, | |
2388 | int len) | |
2389 | { | |
2390 | int current_size = 0; | |
2391 | ||
2392 | if (!*first) { | |
2393 | **to = '|'; | |
2394 | *to += 1; | |
2395 | } else | |
2396 | *first = 0; | |
2397 | ||
2398 | while (current_size < len) { | |
2399 | if (*from != '"') { | |
2400 | **to = *from; | |
2401 | *to += 1; | |
2402 | } | |
2403 | from += 1; | |
2404 | current_size += 1; | |
2405 | } | |
2406 | } | |
2407 | ||
2408 | static int selinux_sb_copy_data(char *orig, char *copy) | |
2409 | { | |
2410 | int fnosec, fsec, rc = 0; | |
2411 | char *in_save, *in_curr, *in_end; | |
2412 | char *sec_curr, *nosec_save, *nosec; | |
2413 | int open_quote = 0; | |
2414 | ||
2415 | in_curr = orig; | |
2416 | sec_curr = copy; | |
2417 | ||
2418 | nosec = (char *)get_zeroed_page(GFP_KERNEL); | |
2419 | if (!nosec) { | |
2420 | rc = -ENOMEM; | |
2421 | goto out; | |
2422 | } | |
2423 | ||
2424 | nosec_save = nosec; | |
2425 | fnosec = fsec = 1; | |
2426 | in_save = in_end = orig; | |
2427 | ||
2428 | do { | |
2429 | if (*in_end == '"') | |
2430 | open_quote = !open_quote; | |
2431 | if ((*in_end == ',' && open_quote == 0) || | |
2432 | *in_end == '\0') { | |
2433 | int len = in_end - in_curr; | |
2434 | ||
2435 | if (selinux_option(in_curr, len)) | |
2436 | take_selinux_option(&sec_curr, in_curr, &fsec, len); | |
2437 | else | |
2438 | take_option(&nosec, in_curr, &fnosec, len); | |
2439 | ||
2440 | in_curr = in_end + 1; | |
2441 | } | |
2442 | } while (*in_end++); | |
2443 | ||
2444 | strcpy(in_save, nosec_save); | |
2445 | free_page((unsigned long)nosec_save); | |
2446 | out: | |
2447 | return rc; | |
2448 | } | |
2449 | ||
2450 | static int selinux_sb_kern_mount(struct super_block *sb, int flags, void *data) | |
2451 | { | |
2452 | const struct cred *cred = current_cred(); | |
2453 | struct common_audit_data ad; | |
2454 | int rc; | |
2455 | ||
2456 | rc = superblock_doinit(sb, data); | |
2457 | if (rc) | |
2458 | return rc; | |
2459 | ||
2460 | /* Allow all mounts performed by the kernel */ | |
2461 | if (flags & MS_KERNMOUNT) | |
2462 | return 0; | |
2463 | ||
2464 | COMMON_AUDIT_DATA_INIT(&ad, FS); | |
2465 | ad.u.fs.path.dentry = sb->s_root; | |
2466 | return superblock_has_perm(cred, sb, FILESYSTEM__MOUNT, &ad); | |
2467 | } | |
2468 | ||
2469 | static int selinux_sb_statfs(struct dentry *dentry) | |
2470 | { | |
2471 | const struct cred *cred = current_cred(); | |
2472 | struct common_audit_data ad; | |
2473 | ||
2474 | COMMON_AUDIT_DATA_INIT(&ad, FS); | |
2475 | ad.u.fs.path.dentry = dentry->d_sb->s_root; | |
2476 | return superblock_has_perm(cred, dentry->d_sb, FILESYSTEM__GETATTR, &ad); | |
2477 | } | |
2478 | ||
2479 | static int selinux_mount(char *dev_name, | |
2480 | struct path *path, | |
2481 | char *type, | |
2482 | unsigned long flags, | |
2483 | void *data) | |
2484 | { | |
2485 | const struct cred *cred = current_cred(); | |
2486 | ||
2487 | if (flags & MS_REMOUNT) | |
2488 | return superblock_has_perm(cred, path->mnt->mnt_sb, | |
2489 | FILESYSTEM__REMOUNT, NULL); | |
2490 | else | |
2491 | return dentry_has_perm(cred, path->mnt, path->dentry, | |
2492 | FILE__MOUNTON); | |
2493 | } | |
2494 | ||
2495 | static int selinux_umount(struct vfsmount *mnt, int flags) | |
2496 | { | |
2497 | const struct cred *cred = current_cred(); | |
2498 | ||
2499 | return superblock_has_perm(cred, mnt->mnt_sb, | |
2500 | FILESYSTEM__UNMOUNT, NULL); | |
2501 | } | |
2502 | ||
2503 | /* inode security operations */ | |
2504 | ||
2505 | static int selinux_inode_alloc_security(struct inode *inode) | |
2506 | { | |
2507 | return inode_alloc_security(inode); | |
2508 | } | |
2509 | ||
2510 | static void selinux_inode_free_security(struct inode *inode) | |
2511 | { | |
2512 | inode_free_security(inode); | |
2513 | } | |
2514 | ||
2515 | static int selinux_inode_init_security(struct inode *inode, struct inode *dir, | |
2516 | char **name, void **value, | |
2517 | size_t *len) | |
2518 | { | |
2519 | const struct task_security_struct *tsec = current_security(); | |
2520 | struct inode_security_struct *dsec; | |
2521 | struct superblock_security_struct *sbsec; | |
2522 | u32 sid, newsid, clen; | |
2523 | int rc; | |
2524 | char *namep = NULL, *context; | |
2525 | ||
2526 | dsec = dir->i_security; | |
2527 | sbsec = dir->i_sb->s_security; | |
2528 | ||
2529 | sid = tsec->sid; | |
2530 | newsid = tsec->create_sid; | |
2531 | ||
2532 | if (!newsid || !(sbsec->flags & SE_SBLABELSUPP)) { | |
2533 | rc = security_transition_sid(sid, dsec->sid, | |
2534 | inode_mode_to_security_class(inode->i_mode), | |
2535 | &newsid); | |
2536 | if (rc) { | |
2537 | printk(KERN_WARNING "%s: " | |
2538 | "security_transition_sid failed, rc=%d (dev=%s " | |
2539 | "ino=%ld)\n", | |
2540 | __func__, | |
2541 | -rc, inode->i_sb->s_id, inode->i_ino); | |
2542 | return rc; | |
2543 | } | |
2544 | } | |
2545 | ||
2546 | /* Possibly defer initialization to selinux_complete_init. */ | |
2547 | if (sbsec->flags & SE_SBINITIALIZED) { | |
2548 | struct inode_security_struct *isec = inode->i_security; | |
2549 | isec->sclass = inode_mode_to_security_class(inode->i_mode); | |
2550 | isec->sid = newsid; | |
2551 | isec->initialized = 1; | |
2552 | } | |
2553 | ||
2554 | if (!ss_initialized || !(sbsec->flags & SE_SBLABELSUPP)) | |
2555 | return -EOPNOTSUPP; | |
2556 | ||
2557 | if (name) { | |
2558 | namep = kstrdup(XATTR_SELINUX_SUFFIX, GFP_NOFS); | |
2559 | if (!namep) | |
2560 | return -ENOMEM; | |
2561 | *name = namep; | |
2562 | } | |
2563 | ||
2564 | if (value && len) { | |
2565 | rc = security_sid_to_context_force(newsid, &context, &clen); | |
2566 | if (rc) { | |
2567 | kfree(namep); | |
2568 | return rc; | |
2569 | } | |
2570 | *value = context; | |
2571 | *len = clen; | |
2572 | } | |
2573 | ||
2574 | return 0; | |
2575 | } | |
2576 | ||
2577 | static int selinux_inode_create(struct inode *dir, struct dentry *dentry, int mask) | |
2578 | { | |
2579 | return may_create(dir, dentry, SECCLASS_FILE); | |
2580 | } | |
2581 | ||
2582 | static int selinux_inode_link(struct dentry *old_dentry, struct inode *dir, struct dentry *new_dentry) | |
2583 | { | |
2584 | return may_link(dir, old_dentry, MAY_LINK); | |
2585 | } | |
2586 | ||
2587 | static int selinux_inode_unlink(struct inode *dir, struct dentry *dentry) | |
2588 | { | |
2589 | return may_link(dir, dentry, MAY_UNLINK); | |
2590 | } | |
2591 | ||
2592 | static int selinux_inode_symlink(struct inode *dir, struct dentry *dentry, const char *name) | |
2593 | { | |
2594 | return may_create(dir, dentry, SECCLASS_LNK_FILE); | |
2595 | } | |
2596 | ||
2597 | static int selinux_inode_mkdir(struct inode *dir, struct dentry *dentry, int mask) | |
2598 | { | |
2599 | return may_create(dir, dentry, SECCLASS_DIR); | |
2600 | } | |
2601 | ||
2602 | static int selinux_inode_rmdir(struct inode *dir, struct dentry *dentry) | |
2603 | { | |
2604 | return may_link(dir, dentry, MAY_RMDIR); | |
2605 | } | |
2606 | ||
2607 | static int selinux_inode_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev) | |
2608 | { | |
2609 | return may_create(dir, dentry, inode_mode_to_security_class(mode)); | |
2610 | } | |
2611 | ||
2612 | static int selinux_inode_rename(struct inode *old_inode, struct dentry *old_dentry, | |
2613 | struct inode *new_inode, struct dentry *new_dentry) | |
2614 | { | |
2615 | return may_rename(old_inode, old_dentry, new_inode, new_dentry); | |
2616 | } | |
2617 | ||
2618 | static int selinux_inode_readlink(struct dentry *dentry) | |
2619 | { | |
2620 | const struct cred *cred = current_cred(); | |
2621 | ||
2622 | return dentry_has_perm(cred, NULL, dentry, FILE__READ); | |
2623 | } | |
2624 | ||
2625 | static int selinux_inode_follow_link(struct dentry *dentry, struct nameidata *nameidata) | |
2626 | { | |
2627 | const struct cred *cred = current_cred(); | |
2628 | ||
2629 | return dentry_has_perm(cred, NULL, dentry, FILE__READ); | |
2630 | } | |
2631 | ||
2632 | static int selinux_inode_permission(struct inode *inode, int mask) | |
2633 | { | |
2634 | const struct cred *cred = current_cred(); | |
2635 | struct common_audit_data ad; | |
2636 | u32 perms; | |
2637 | bool from_access; | |
2638 | ||
2639 | from_access = mask & MAY_ACCESS; | |
2640 | mask &= (MAY_READ|MAY_WRITE|MAY_EXEC|MAY_APPEND); | |
2641 | ||
2642 | /* No permission to check. Existence test. */ | |
2643 | if (!mask) | |
2644 | return 0; | |
2645 | ||
2646 | COMMON_AUDIT_DATA_INIT(&ad, FS); | |
2647 | ad.u.fs.inode = inode; | |
2648 | ||
2649 | if (from_access) | |
2650 | ad.selinux_audit_data.auditdeny |= FILE__AUDIT_ACCESS; | |
2651 | ||
2652 | perms = file_mask_to_av(inode->i_mode, mask); | |
2653 | ||
2654 | return inode_has_perm(cred, inode, perms, &ad); | |
2655 | } | |
2656 | ||
2657 | static int selinux_inode_setattr(struct dentry *dentry, struct iattr *iattr) | |
2658 | { | |
2659 | const struct cred *cred = current_cred(); | |
2660 | unsigned int ia_valid = iattr->ia_valid; | |
2661 | ||
2662 | /* ATTR_FORCE is just used for ATTR_KILL_S[UG]ID. */ | |
2663 | if (ia_valid & ATTR_FORCE) { | |
2664 | ia_valid &= ~(ATTR_KILL_SUID | ATTR_KILL_SGID | ATTR_MODE | | |
2665 | ATTR_FORCE); | |
2666 | if (!ia_valid) | |
2667 | return 0; | |
2668 | } | |
2669 | ||
2670 | if (ia_valid & (ATTR_MODE | ATTR_UID | ATTR_GID | | |
2671 | ATTR_ATIME_SET | ATTR_MTIME_SET | ATTR_TIMES_SET)) | |
2672 | return dentry_has_perm(cred, NULL, dentry, FILE__SETATTR); | |
2673 | ||
2674 | return dentry_has_perm(cred, NULL, dentry, FILE__WRITE); | |
2675 | } | |
2676 | ||
2677 | static int selinux_inode_getattr(struct vfsmount *mnt, struct dentry *dentry) | |
2678 | { | |
2679 | const struct cred *cred = current_cred(); | |
2680 | ||
2681 | return dentry_has_perm(cred, mnt, dentry, FILE__GETATTR); | |
2682 | } | |
2683 | ||
2684 | static int selinux_inode_setotherxattr(struct dentry *dentry, const char *name) | |
2685 | { | |
2686 | const struct cred *cred = current_cred(); | |
2687 | ||
2688 | if (!strncmp(name, XATTR_SECURITY_PREFIX, | |
2689 | sizeof XATTR_SECURITY_PREFIX - 1)) { | |
2690 | if (!strcmp(name, XATTR_NAME_CAPS)) { | |
2691 | if (!capable(CAP_SETFCAP)) | |
2692 | return -EPERM; | |
2693 | } else if (!capable(CAP_SYS_ADMIN)) { | |
2694 | /* A different attribute in the security namespace. | |
2695 | Restrict to administrator. */ | |
2696 | return -EPERM; | |
2697 | } | |
2698 | } | |
2699 | ||
2700 | /* Not an attribute we recognize, so just check the | |
2701 | ordinary setattr permission. */ | |
2702 | return dentry_has_perm(cred, NULL, dentry, FILE__SETATTR); | |
2703 | } | |
2704 | ||
2705 | static int selinux_inode_setxattr(struct dentry *dentry, const char *name, | |
2706 | const void *value, size_t size, int flags) | |
2707 | { | |
2708 | struct inode *inode = dentry->d_inode; | |
2709 | struct inode_security_struct *isec = inode->i_security; | |
2710 | struct superblock_security_struct *sbsec; | |
2711 | struct common_audit_data ad; | |
2712 | u32 newsid, sid = current_sid(); | |
2713 | int rc = 0; | |
2714 | ||
2715 | if (strcmp(name, XATTR_NAME_SELINUX)) | |
2716 | return selinux_inode_setotherxattr(dentry, name); | |
2717 | ||
2718 | sbsec = inode->i_sb->s_security; | |
2719 | if (!(sbsec->flags & SE_SBLABELSUPP)) | |
2720 | return -EOPNOTSUPP; | |
2721 | ||
2722 | if (!is_owner_or_cap(inode)) | |
2723 | return -EPERM; | |
2724 | ||
2725 | COMMON_AUDIT_DATA_INIT(&ad, FS); | |
2726 | ad.u.fs.path.dentry = dentry; | |
2727 | ||
2728 | rc = avc_has_perm(sid, isec->sid, isec->sclass, | |
2729 | FILE__RELABELFROM, &ad); | |
2730 | if (rc) | |
2731 | return rc; | |
2732 | ||
2733 | rc = security_context_to_sid(value, size, &newsid); | |
2734 | if (rc == -EINVAL) { | |
2735 | if (!capable(CAP_MAC_ADMIN)) | |
2736 | return rc; | |
2737 | rc = security_context_to_sid_force(value, size, &newsid); | |
2738 | } | |
2739 | if (rc) | |
2740 | return rc; | |
2741 | ||
2742 | rc = avc_has_perm(sid, newsid, isec->sclass, | |
2743 | FILE__RELABELTO, &ad); | |
2744 | if (rc) | |
2745 | return rc; | |
2746 | ||
2747 | rc = security_validate_transition(isec->sid, newsid, sid, | |
2748 | isec->sclass); | |
2749 | if (rc) | |
2750 | return rc; | |
2751 | ||
2752 | return avc_has_perm(newsid, | |
2753 | sbsec->sid, | |
2754 | SECCLASS_FILESYSTEM, | |
2755 | FILESYSTEM__ASSOCIATE, | |
2756 | &ad); | |
2757 | } | |
2758 | ||
2759 | static void selinux_inode_post_setxattr(struct dentry *dentry, const char *name, | |
2760 | const void *value, size_t size, | |
2761 | int flags) | |
2762 | { | |
2763 | struct inode *inode = dentry->d_inode; | |
2764 | struct inode_security_struct *isec = inode->i_security; | |
2765 | u32 newsid; | |
2766 | int rc; | |
2767 | ||
2768 | if (strcmp(name, XATTR_NAME_SELINUX)) { | |
2769 | /* Not an attribute we recognize, so nothing to do. */ | |
2770 | return; | |
2771 | } | |
2772 | ||
2773 | rc = security_context_to_sid_force(value, size, &newsid); | |
2774 | if (rc) { | |
2775 | printk(KERN_ERR "SELinux: unable to map context to SID" | |
2776 | "for (%s, %lu), rc=%d\n", | |
2777 | inode->i_sb->s_id, inode->i_ino, -rc); | |
2778 | return; | |
2779 | } | |
2780 | ||
2781 | isec->sid = newsid; | |
2782 | return; | |
2783 | } | |
2784 | ||
2785 | static int selinux_inode_getxattr(struct dentry *dentry, const char *name) | |
2786 | { | |
2787 | const struct cred *cred = current_cred(); | |
2788 | ||
2789 | return dentry_has_perm(cred, NULL, dentry, FILE__GETATTR); | |
2790 | } | |
2791 | ||
2792 | static int selinux_inode_listxattr(struct dentry *dentry) | |
2793 | { | |
2794 | const struct cred *cred = current_cred(); | |
2795 | ||
2796 | return dentry_has_perm(cred, NULL, dentry, FILE__GETATTR); | |
2797 | } | |
2798 | ||
2799 | static int selinux_inode_removexattr(struct dentry *dentry, const char *name) | |
2800 | { | |
2801 | if (strcmp(name, XATTR_NAME_SELINUX)) | |
2802 | return selinux_inode_setotherxattr(dentry, name); | |
2803 | ||
2804 | /* No one is allowed to remove a SELinux security label. | |
2805 | You can change the label, but all data must be labeled. */ | |
2806 | return -EACCES; | |
2807 | } | |
2808 | ||
2809 | /* | |
2810 | * Copy the inode security context value to the user. | |
2811 | * | |
2812 | * Permission check is handled by selinux_inode_getxattr hook. | |
2813 | */ | |
2814 | static int selinux_inode_getsecurity(const struct inode *inode, const char *name, void **buffer, bool alloc) | |
2815 | { | |
2816 | u32 size; | |
2817 | int error; | |
2818 | char *context = NULL; | |
2819 | struct inode_security_struct *isec = inode->i_security; | |
2820 | ||
2821 | if (strcmp(name, XATTR_SELINUX_SUFFIX)) | |
2822 | return -EOPNOTSUPP; | |
2823 | ||
2824 | /* | |
2825 | * If the caller has CAP_MAC_ADMIN, then get the raw context | |
2826 | * value even if it is not defined by current policy; otherwise, | |
2827 | * use the in-core value under current policy. | |
2828 | * Use the non-auditing forms of the permission checks since | |
2829 | * getxattr may be called by unprivileged processes commonly | |
2830 | * and lack of permission just means that we fall back to the | |
2831 | * in-core context value, not a denial. | |
2832 | */ | |
2833 | error = selinux_capable(current, current_cred(), CAP_MAC_ADMIN, | |
2834 | SECURITY_CAP_NOAUDIT); | |
2835 | if (!error) | |
2836 | error = security_sid_to_context_force(isec->sid, &context, | |
2837 | &size); | |
2838 | else | |
2839 | error = security_sid_to_context(isec->sid, &context, &size); | |
2840 | if (error) | |
2841 | return error; | |
2842 | error = size; | |
2843 | if (alloc) { | |
2844 | *buffer = context; | |
2845 | goto out_nofree; | |
2846 | } | |
2847 | kfree(context); | |
2848 | out_nofree: | |
2849 | return error; | |
2850 | } | |
2851 | ||
2852 | static int selinux_inode_setsecurity(struct inode *inode, const char *name, | |
2853 | const void *value, size_t size, int flags) | |
2854 | { | |
2855 | struct inode_security_struct *isec = inode->i_security; | |
2856 | u32 newsid; | |
2857 | int rc; | |
2858 | ||
2859 | if (strcmp(name, XATTR_SELINUX_SUFFIX)) | |
2860 | return -EOPNOTSUPP; | |
2861 | ||
2862 | if (!value || !size) | |
2863 | return -EACCES; | |
2864 | ||
2865 | rc = security_context_to_sid((void *)value, size, &newsid); | |
2866 | if (rc) | |
2867 | return rc; | |
2868 | ||
2869 | isec->sid = newsid; | |
2870 | isec->initialized = 1; | |
2871 | return 0; | |
2872 | } | |
2873 | ||
2874 | static int selinux_inode_listsecurity(struct inode *inode, char *buffer, size_t buffer_size) | |
2875 | { | |
2876 | const int len = sizeof(XATTR_NAME_SELINUX); | |
2877 | if (buffer && len <= buffer_size) | |
2878 | memcpy(buffer, XATTR_NAME_SELINUX, len); | |
2879 | return len; | |
2880 | } | |
2881 | ||
2882 | static void selinux_inode_getsecid(const struct inode *inode, u32 *secid) | |
2883 | { | |
2884 | struct inode_security_struct *isec = inode->i_security; | |
2885 | *secid = isec->sid; | |
2886 | } | |
2887 | ||
2888 | /* file security operations */ | |
2889 | ||
2890 | static int selinux_revalidate_file_permission(struct file *file, int mask) | |
2891 | { | |
2892 | const struct cred *cred = current_cred(); | |
2893 | struct inode *inode = file->f_path.dentry->d_inode; | |
2894 | ||
2895 | /* file_mask_to_av won't add FILE__WRITE if MAY_APPEND is set */ | |
2896 | if ((file->f_flags & O_APPEND) && (mask & MAY_WRITE)) | |
2897 | mask |= MAY_APPEND; | |
2898 | ||
2899 | return file_has_perm(cred, file, | |
2900 | file_mask_to_av(inode->i_mode, mask)); | |
2901 | } | |
2902 | ||
2903 | static int selinux_file_permission(struct file *file, int mask) | |
2904 | { | |
2905 | struct inode *inode = file->f_path.dentry->d_inode; | |
2906 | struct file_security_struct *fsec = file->f_security; | |
2907 | struct inode_security_struct *isec = inode->i_security; | |
2908 | u32 sid = current_sid(); | |
2909 | ||
2910 | if (!mask) | |
2911 | /* No permission to check. Existence test. */ | |
2912 | return 0; | |
2913 | ||
2914 | if (sid == fsec->sid && fsec->isid == isec->sid && | |
2915 | fsec->pseqno == avc_policy_seqno()) | |
2916 | /* No change since dentry_open check. */ | |
2917 | return 0; | |
2918 | ||
2919 | return selinux_revalidate_file_permission(file, mask); | |
2920 | } | |
2921 | ||
2922 | static int selinux_file_alloc_security(struct file *file) | |
2923 | { | |
2924 | return file_alloc_security(file); | |
2925 | } | |
2926 | ||
2927 | static void selinux_file_free_security(struct file *file) | |
2928 | { | |
2929 | file_free_security(file); | |
2930 | } | |
2931 | ||
2932 | static int selinux_file_ioctl(struct file *file, unsigned int cmd, | |
2933 | unsigned long arg) | |
2934 | { | |
2935 | const struct cred *cred = current_cred(); | |
2936 | u32 av = 0; | |
2937 | ||
2938 | if (_IOC_DIR(cmd) & _IOC_WRITE) | |
2939 | av |= FILE__WRITE; | |
2940 | if (_IOC_DIR(cmd) & _IOC_READ) | |
2941 | av |= FILE__READ; | |
2942 | if (!av) | |
2943 | av = FILE__IOCTL; | |
2944 | ||
2945 | return file_has_perm(cred, file, av); | |
2946 | } | |
2947 | ||
2948 | static int default_noexec; | |
2949 | ||
2950 | static int file_map_prot_check(struct file *file, unsigned long prot, int shared) | |
2951 | { | |
2952 | const struct cred *cred = current_cred(); | |
2953 | int rc = 0; | |
2954 | ||
2955 | if (default_noexec && | |
2956 | (prot & PROT_EXEC) && (!file || (!shared && (prot & PROT_WRITE)))) { | |
2957 | /* | |
2958 | * We are making executable an anonymous mapping or a | |
2959 | * private file mapping that will also be writable. | |
2960 | * This has an additional check. | |
2961 | */ | |
2962 | rc = cred_has_perm(cred, cred, PROCESS__EXECMEM); | |
2963 | if (rc) | |
2964 | goto error; | |
2965 | } | |
2966 | ||
2967 | if (file) { | |
2968 | /* read access is always possible with a mapping */ | |
2969 | u32 av = FILE__READ; | |
2970 | ||
2971 | /* write access only matters if the mapping is shared */ | |
2972 | if (shared && (prot & PROT_WRITE)) | |
2973 | av |= FILE__WRITE; | |
2974 | ||
2975 | if (prot & PROT_EXEC) | |
2976 | av |= FILE__EXECUTE; | |
2977 | ||
2978 | return file_has_perm(cred, file, av); | |
2979 | } | |
2980 | ||
2981 | error: | |
2982 | return rc; | |
2983 | } | |
2984 | ||
2985 | static int selinux_file_mmap(struct file *file, unsigned long reqprot, | |
2986 | unsigned long prot, unsigned long flags, | |
2987 | unsigned long addr, unsigned long addr_only) | |
2988 | { | |
2989 | int rc = 0; | |
2990 | u32 sid = current_sid(); | |
2991 | ||
2992 | /* | |
2993 | * notice that we are intentionally putting the SELinux check before | |
2994 | * the secondary cap_file_mmap check. This is such a likely attempt | |
2995 | * at bad behaviour/exploit that we always want to get the AVC, even | |
2996 | * if DAC would have also denied the operation. | |
2997 | */ | |
2998 | if (addr < CONFIG_LSM_MMAP_MIN_ADDR) { | |
2999 | rc = avc_has_perm(sid, sid, SECCLASS_MEMPROTECT, | |
3000 | MEMPROTECT__MMAP_ZERO, NULL); | |
3001 | if (rc) | |
3002 | return rc; | |
3003 | } | |
3004 | ||
3005 | /* do DAC check on address space usage */ | |
3006 | rc = cap_file_mmap(file, reqprot, prot, flags, addr, addr_only); | |
3007 | if (rc || addr_only) | |
3008 | return rc; | |
3009 | ||
3010 | if (selinux_checkreqprot) | |
3011 | prot = reqprot; | |
3012 | ||
3013 | return file_map_prot_check(file, prot, | |
3014 | (flags & MAP_TYPE) == MAP_SHARED); | |
3015 | } | |
3016 | ||
3017 | static int selinux_file_mprotect(struct vm_area_struct *vma, | |
3018 | unsigned long reqprot, | |
3019 | unsigned long prot) | |
3020 | { | |
3021 | const struct cred *cred = current_cred(); | |
3022 | ||
3023 | if (selinux_checkreqprot) | |
3024 | prot = reqprot; | |
3025 | ||
3026 | if (default_noexec && | |
3027 | (prot & PROT_EXEC) && !(vma->vm_flags & VM_EXEC)) { | |
3028 | int rc = 0; | |
3029 | if (vma->vm_start >= vma->vm_mm->start_brk && | |
3030 | vma->vm_end <= vma->vm_mm->brk) { | |
3031 | rc = cred_has_perm(cred, cred, PROCESS__EXECHEAP); | |
3032 | } else if (!vma->vm_file && | |
3033 | vma->vm_start <= vma->vm_mm->start_stack && | |
3034 | vma->vm_end >= vma->vm_mm->start_stack) { | |
3035 | rc = current_has_perm(current, PROCESS__EXECSTACK); | |
3036 | } else if (vma->vm_file && vma->anon_vma) { | |
3037 | /* | |
3038 | * We are making executable a file mapping that has | |
3039 | * had some COW done. Since pages might have been | |
3040 | * written, check ability to execute the possibly | |
3041 | * modified content. This typically should only | |
3042 | * occur for text relocations. | |
3043 | */ | |
3044 | rc = file_has_perm(cred, vma->vm_file, FILE__EXECMOD); | |
3045 | } | |
3046 | if (rc) | |
3047 | return rc; | |
3048 | } | |
3049 | ||
3050 | return file_map_prot_check(vma->vm_file, prot, vma->vm_flags&VM_SHARED); | |
3051 | } | |
3052 | ||
3053 | static int selinux_file_lock(struct file *file, unsigned int cmd) | |
3054 | { | |
3055 | const struct cred *cred = current_cred(); | |
3056 | ||
3057 | return file_has_perm(cred, file, FILE__LOCK); | |
3058 | } | |
3059 | ||
3060 | static int selinux_file_fcntl(struct file *file, unsigned int cmd, | |
3061 | unsigned long arg) | |
3062 | { | |
3063 | const struct cred *cred = current_cred(); | |
3064 | int err = 0; | |
3065 | ||
3066 | switch (cmd) { | |
3067 | case F_SETFL: | |
3068 | if (!file->f_path.dentry || !file->f_path.dentry->d_inode) { | |
3069 | err = -EINVAL; | |
3070 | break; | |
3071 | } | |
3072 | ||
3073 | if ((file->f_flags & O_APPEND) && !(arg & O_APPEND)) { | |
3074 | err = file_has_perm(cred, file, FILE__WRITE); | |
3075 | break; | |
3076 | } | |
3077 | /* fall through */ | |
3078 | case F_SETOWN: | |
3079 | case F_SETSIG: | |
3080 | case F_GETFL: | |
3081 | case F_GETOWN: | |
3082 | case F_GETSIG: | |
3083 | /* Just check FD__USE permission */ | |
3084 | err = file_has_perm(cred, file, 0); | |
3085 | break; | |
3086 | case F_GETLK: | |
3087 | case F_SETLK: | |
3088 | case F_SETLKW: | |
3089 | #if BITS_PER_LONG == 32 | |
3090 | case F_GETLK64: | |
3091 | case F_SETLK64: | |
3092 | case F_SETLKW64: | |
3093 | #endif | |
3094 | if (!file->f_path.dentry || !file->f_path.dentry->d_inode) { | |
3095 | err = -EINVAL; | |
3096 | break; | |
3097 | } | |
3098 | err = file_has_perm(cred, file, FILE__LOCK); | |
3099 | break; | |
3100 | } | |
3101 | ||
3102 | return err; | |
3103 | } | |
3104 | ||
3105 | static int selinux_file_set_fowner(struct file *file) | |
3106 | { | |
3107 | struct file_security_struct *fsec; | |
3108 | ||
3109 | fsec = file->f_security; | |
3110 | fsec->fown_sid = current_sid(); | |
3111 | ||
3112 | return 0; | |
3113 | } | |
3114 | ||
3115 | static int selinux_file_send_sigiotask(struct task_struct *tsk, | |
3116 | struct fown_struct *fown, int signum) | |
3117 | { | |
3118 | struct file *file; | |
3119 | u32 sid = task_sid(tsk); | |
3120 | u32 perm; | |
3121 | struct file_security_struct *fsec; | |
3122 | ||
3123 | /* struct fown_struct is never outside the context of a struct file */ | |
3124 | file = container_of(fown, struct file, f_owner); | |
3125 | ||
3126 | fsec = file->f_security; | |
3127 | ||
3128 | if (!signum) | |
3129 | perm = signal_to_av(SIGIO); /* as per send_sigio_to_task */ | |
3130 | else | |
3131 | perm = signal_to_av(signum); | |
3132 | ||
3133 | return avc_has_perm(fsec->fown_sid, sid, | |
3134 | SECCLASS_PROCESS, perm, NULL); | |
3135 | } | |
3136 | ||
3137 | static int selinux_file_receive(struct file *file) | |
3138 | { | |
3139 | const struct cred *cred = current_cred(); | |
3140 | ||
3141 | return file_has_perm(cred, file, file_to_av(file)); | |
3142 | } | |
3143 | ||
3144 | static int selinux_dentry_open(struct file *file, const struct cred *cred) | |
3145 | { | |
3146 | struct file_security_struct *fsec; | |
3147 | struct inode *inode; | |
3148 | struct inode_security_struct *isec; | |
3149 | ||
3150 | inode = file->f_path.dentry->d_inode; | |
3151 | fsec = file->f_security; | |
3152 | isec = inode->i_security; | |
3153 | /* | |
3154 | * Save inode label and policy sequence number | |
3155 | * at open-time so that selinux_file_permission | |
3156 | * can determine whether revalidation is necessary. | |
3157 | * Task label is already saved in the file security | |
3158 | * struct as its SID. | |
3159 | */ | |
3160 | fsec->isid = isec->sid; | |
3161 | fsec->pseqno = avc_policy_seqno(); | |
3162 | /* | |
3163 | * Since the inode label or policy seqno may have changed | |
3164 | * between the selinux_inode_permission check and the saving | |
3165 | * of state above, recheck that access is still permitted. | |
3166 | * Otherwise, access might never be revalidated against the | |
3167 | * new inode label or new policy. | |
3168 | * This check is not redundant - do not remove. | |
3169 | */ | |
3170 | return inode_has_perm(cred, inode, open_file_to_av(file), NULL); | |
3171 | } | |
3172 | ||
3173 | /* task security operations */ | |
3174 | ||
3175 | static int selinux_task_create(unsigned long clone_flags) | |
3176 | { | |
3177 | return current_has_perm(current, PROCESS__FORK); | |
3178 | } | |
3179 | ||
3180 | /* | |
3181 | * allocate the SELinux part of blank credentials | |
3182 | */ | |
3183 | static int selinux_cred_alloc_blank(struct cred *cred, gfp_t gfp) | |
3184 | { | |
3185 | struct task_security_struct *tsec; | |
3186 | ||
3187 | tsec = kzalloc(sizeof(struct task_security_struct), gfp); | |
3188 | if (!tsec) | |
3189 | return -ENOMEM; | |
3190 | ||
3191 | cred->security = tsec; | |
3192 | return 0; | |
3193 | } | |
3194 | ||
3195 | /* | |
3196 | * detach and free the LSM part of a set of credentials | |
3197 | */ | |
3198 | static void selinux_cred_free(struct cred *cred) | |
3199 | { | |
3200 | struct task_security_struct *tsec = cred->security; | |
3201 | ||
3202 | BUG_ON((unsigned long) cred->security < PAGE_SIZE); | |
3203 | cred->security = (void *) 0x7UL; | |
3204 | kfree(tsec); | |
3205 | } | |
3206 | ||
3207 | /* | |
3208 | * prepare a new set of credentials for modification | |
3209 | */ | |
3210 | static int selinux_cred_prepare(struct cred *new, const struct cred *old, | |
3211 | gfp_t gfp) | |
3212 | { | |
3213 | const struct task_security_struct *old_tsec; | |
3214 | struct task_security_struct *tsec; | |
3215 | ||
3216 | old_tsec = old->security; | |
3217 | ||
3218 | tsec = kmemdup(old_tsec, sizeof(struct task_security_struct), gfp); | |
3219 | if (!tsec) | |
3220 | return -ENOMEM; | |
3221 | ||
3222 | new->security = tsec; | |
3223 | return 0; | |
3224 | } | |
3225 | ||
3226 | /* | |
3227 | * transfer the SELinux data to a blank set of creds | |
3228 | */ | |
3229 | static void selinux_cred_transfer(struct cred *new, const struct cred *old) | |
3230 | { | |
3231 | const struct task_security_struct *old_tsec = old->security; | |
3232 | struct task_security_struct *tsec = new->security; | |
3233 | ||
3234 | *tsec = *old_tsec; | |
3235 | } | |
3236 | ||
3237 | /* | |
3238 | * set the security data for a kernel service | |
3239 | * - all the creation contexts are set to unlabelled | |
3240 | */ | |
3241 | static int selinux_kernel_act_as(struct cred *new, u32 secid) | |
3242 | { | |
3243 | struct task_security_struct *tsec = new->security; | |
3244 | u32 sid = current_sid(); | |
3245 | int ret; | |
3246 | ||
3247 | ret = avc_has_perm(sid, secid, | |
3248 | SECCLASS_KERNEL_SERVICE, | |
3249 | KERNEL_SERVICE__USE_AS_OVERRIDE, | |
3250 | NULL); | |
3251 | if (ret == 0) { | |
3252 | tsec->sid = secid; | |
3253 | tsec->create_sid = 0; | |
3254 | tsec->keycreate_sid = 0; | |
3255 | tsec->sockcreate_sid = 0; | |
3256 | } | |
3257 | return ret; | |
3258 | } | |
3259 | ||
3260 | /* | |
3261 | * set the file creation context in a security record to the same as the | |
3262 | * objective context of the specified inode | |
3263 | */ | |
3264 | static int selinux_kernel_create_files_as(struct cred *new, struct inode *inode) | |
3265 | { | |
3266 | struct inode_security_struct *isec = inode->i_security; | |
3267 | struct task_security_struct *tsec = new->security; | |
3268 | u32 sid = current_sid(); | |
3269 | int ret; | |
3270 | ||
3271 | ret = avc_has_perm(sid, isec->sid, | |
3272 | SECCLASS_KERNEL_SERVICE, | |
3273 | KERNEL_SERVICE__CREATE_FILES_AS, | |
3274 | NULL); | |
3275 | ||
3276 | if (ret == 0) | |
3277 | tsec->create_sid = isec->sid; | |
3278 | return ret; | |
3279 | } | |
3280 | ||
3281 | static int selinux_kernel_module_request(char *kmod_name) | |
3282 | { | |
3283 | u32 sid; | |
3284 | struct common_audit_data ad; | |
3285 | ||
3286 | sid = task_sid(current); | |
3287 | ||
3288 | COMMON_AUDIT_DATA_INIT(&ad, KMOD); | |
3289 | ad.u.kmod_name = kmod_name; | |
3290 | ||
3291 | return avc_has_perm(sid, SECINITSID_KERNEL, SECCLASS_SYSTEM, | |
3292 | SYSTEM__MODULE_REQUEST, &ad); | |
3293 | } | |
3294 | ||
3295 | static int selinux_task_setpgid(struct task_struct *p, pid_t pgid) | |
3296 | { | |
3297 | return current_has_perm(p, PROCESS__SETPGID); | |
3298 | } | |
3299 | ||
3300 | static int selinux_task_getpgid(struct task_struct *p) | |
3301 | { | |
3302 | return current_has_perm(p, PROCESS__GETPGID); | |
3303 | } | |
3304 | ||
3305 | static int selinux_task_getsid(struct task_struct *p) | |
3306 | { | |
3307 | return current_has_perm(p, PROCESS__GETSESSION); | |
3308 | } | |
3309 | ||
3310 | static void selinux_task_getsecid(struct task_struct *p, u32 *secid) | |
3311 | { | |
3312 | *secid = task_sid(p); | |
3313 | } | |
3314 | ||
3315 | static int selinux_task_setnice(struct task_struct *p, int nice) | |
3316 | { | |
3317 | int rc; | |
3318 | ||
3319 | rc = cap_task_setnice(p, nice); | |
3320 | if (rc) | |
3321 | return rc; | |
3322 | ||
3323 | return current_has_perm(p, PROCESS__SETSCHED); | |
3324 | } | |
3325 | ||
3326 | static int selinux_task_setioprio(struct task_struct *p, int ioprio) | |
3327 | { | |
3328 | int rc; | |
3329 | ||
3330 | rc = cap_task_setioprio(p, ioprio); | |
3331 | if (rc) | |
3332 | return rc; | |
3333 | ||
3334 | return current_has_perm(p, PROCESS__SETSCHED); | |
3335 | } | |
3336 | ||
3337 | static int selinux_task_getioprio(struct task_struct *p) | |
3338 | { | |
3339 | return current_has_perm(p, PROCESS__GETSCHED); | |
3340 | } | |
3341 | ||
3342 | static int selinux_task_setrlimit(struct task_struct *p, unsigned int resource, | |
3343 | struct rlimit *new_rlim) | |
3344 | { | |
3345 | struct rlimit *old_rlim = p->signal->rlim + resource; | |
3346 | ||
3347 | /* Control the ability to change the hard limit (whether | |
3348 | lowering or raising it), so that the hard limit can | |
3349 | later be used as a safe reset point for the soft limit | |
3350 | upon context transitions. See selinux_bprm_committing_creds. */ | |
3351 | if (old_rlim->rlim_max != new_rlim->rlim_max) | |
3352 | return current_has_perm(p, PROCESS__SETRLIMIT); | |
3353 | ||
3354 | return 0; | |
3355 | } | |
3356 | ||
3357 | static int selinux_task_setscheduler(struct task_struct *p) | |
3358 | { | |
3359 | int rc; | |
3360 | ||
3361 | rc = cap_task_setscheduler(p); | |
3362 | if (rc) | |
3363 | return rc; | |
3364 | ||
3365 | return current_has_perm(p, PROCESS__SETSCHED); | |
3366 | } | |
3367 | ||
3368 | static int selinux_task_getscheduler(struct task_struct *p) | |
3369 | { | |
3370 | return current_has_perm(p, PROCESS__GETSCHED); | |
3371 | } | |
3372 | ||
3373 | static int selinux_task_movememory(struct task_struct *p) | |
3374 | { | |
3375 | return current_has_perm(p, PROCESS__SETSCHED); | |
3376 | } | |
3377 | ||
3378 | static int selinux_task_kill(struct task_struct *p, struct siginfo *info, | |
3379 | int sig, u32 secid) | |
3380 | { | |
3381 | u32 perm; | |
3382 | int rc; | |
3383 | ||
3384 | if (!sig) | |
3385 | perm = PROCESS__SIGNULL; /* null signal; existence test */ | |
3386 | else | |
3387 | perm = signal_to_av(sig); | |
3388 | if (secid) | |
3389 | rc = avc_has_perm(secid, task_sid(p), | |
3390 | SECCLASS_PROCESS, perm, NULL); | |
3391 | else | |
3392 | rc = current_has_perm(p, perm); | |
3393 | return rc; | |
3394 | } | |
3395 | ||
3396 | static int selinux_task_wait(struct task_struct *p) | |
3397 | { | |
3398 | return task_has_perm(p, current, PROCESS__SIGCHLD); | |
3399 | } | |
3400 | ||
3401 | static void selinux_task_to_inode(struct task_struct *p, | |
3402 | struct inode *inode) | |
3403 | { | |
3404 | struct inode_security_struct *isec = inode->i_security; | |
3405 | u32 sid = task_sid(p); | |
3406 | ||
3407 | isec->sid = sid; | |
3408 | isec->initialized = 1; | |
3409 | } | |
3410 | ||
3411 | /* Returns error only if unable to parse addresses */ | |
3412 | static int selinux_parse_skb_ipv4(struct sk_buff *skb, | |
3413 | struct common_audit_data *ad, u8 *proto) | |
3414 | { | |
3415 | int offset, ihlen, ret = -EINVAL; | |
3416 | struct iphdr _iph, *ih; | |
3417 | ||
3418 | offset = skb_network_offset(skb); | |
3419 | ih = skb_header_pointer(skb, offset, sizeof(_iph), &_iph); | |
3420 | if (ih == NULL) | |
3421 | goto out; | |
3422 | ||
3423 | ihlen = ih->ihl * 4; | |
3424 | if (ihlen < sizeof(_iph)) | |
3425 | goto out; | |
3426 | ||
3427 | ad->u.net.v4info.saddr = ih->saddr; | |
3428 | ad->u.net.v4info.daddr = ih->daddr; | |
3429 | ret = 0; | |
3430 | ||
3431 | if (proto) | |
3432 | *proto = ih->protocol; | |
3433 | ||
3434 | switch (ih->protocol) { | |
3435 | case IPPROTO_TCP: { | |
3436 | struct tcphdr _tcph, *th; | |
3437 | ||
3438 | if (ntohs(ih->frag_off) & IP_OFFSET) | |
3439 | break; | |
3440 | ||
3441 | offset += ihlen; | |
3442 | th = skb_header_pointer(skb, offset, sizeof(_tcph), &_tcph); | |
3443 | if (th == NULL) | |
3444 | break; | |
3445 | ||
3446 | ad->u.net.sport = th->source; | |
3447 | ad->u.net.dport = th->dest; | |
3448 | break; | |
3449 | } | |
3450 | ||
3451 | case IPPROTO_UDP: { | |
3452 | struct udphdr _udph, *uh; | |
3453 | ||
3454 | if (ntohs(ih->frag_off) & IP_OFFSET) | |
3455 | break; | |
3456 | ||
3457 | offset += ihlen; | |
3458 | uh = skb_header_pointer(skb, offset, sizeof(_udph), &_udph); | |
3459 | if (uh == NULL) | |
3460 | break; | |
3461 | ||
3462 | ad->u.net.sport = uh->source; | |
3463 | ad->u.net.dport = uh->dest; | |
3464 | break; | |
3465 | } | |
3466 | ||
3467 | case IPPROTO_DCCP: { | |
3468 | struct dccp_hdr _dccph, *dh; | |
3469 | ||
3470 | if (ntohs(ih->frag_off) & IP_OFFSET) | |
3471 | break; | |
3472 | ||
3473 | offset += ihlen; | |
3474 | dh = skb_header_pointer(skb, offset, sizeof(_dccph), &_dccph); | |
3475 | if (dh == NULL) | |
3476 | break; | |
3477 | ||
3478 | ad->u.net.sport = dh->dccph_sport; | |
3479 | ad->u.net.dport = dh->dccph_dport; | |
3480 | break; | |
3481 | } | |
3482 | ||
3483 | default: | |
3484 | break; | |
3485 | } | |
3486 | out: | |
3487 | return ret; | |
3488 | } | |
3489 | ||
3490 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
3491 | ||
3492 | /* Returns error only if unable to parse addresses */ | |
3493 | static int selinux_parse_skb_ipv6(struct sk_buff *skb, | |
3494 | struct common_audit_data *ad, u8 *proto) | |
3495 | { | |
3496 | u8 nexthdr; | |
3497 | int ret = -EINVAL, offset; | |
3498 | struct ipv6hdr _ipv6h, *ip6; | |
3499 | ||
3500 | offset = skb_network_offset(skb); | |
3501 | ip6 = skb_header_pointer(skb, offset, sizeof(_ipv6h), &_ipv6h); | |
3502 | if (ip6 == NULL) | |
3503 | goto out; | |
3504 | ||
3505 | ipv6_addr_copy(&ad->u.net.v6info.saddr, &ip6->saddr); | |
3506 | ipv6_addr_copy(&ad->u.net.v6info.daddr, &ip6->daddr); | |
3507 | ret = 0; | |
3508 | ||
3509 | nexthdr = ip6->nexthdr; | |
3510 | offset += sizeof(_ipv6h); | |
3511 | offset = ipv6_skip_exthdr(skb, offset, &nexthdr); | |
3512 | if (offset < 0) | |
3513 | goto out; | |
3514 | ||
3515 | if (proto) | |
3516 | *proto = nexthdr; | |
3517 | ||
3518 | switch (nexthdr) { | |
3519 | case IPPROTO_TCP: { | |
3520 | struct tcphdr _tcph, *th; | |
3521 | ||
3522 | th = skb_header_pointer(skb, offset, sizeof(_tcph), &_tcph); | |
3523 | if (th == NULL) | |
3524 | break; | |
3525 | ||
3526 | ad->u.net.sport = th->source; | |
3527 | ad->u.net.dport = th->dest; | |
3528 | break; | |
3529 | } | |
3530 | ||
3531 | case IPPROTO_UDP: { | |
3532 | struct udphdr _udph, *uh; | |
3533 | ||
3534 | uh = skb_header_pointer(skb, offset, sizeof(_udph), &_udph); | |
3535 | if (uh == NULL) | |
3536 | break; | |
3537 | ||
3538 | ad->u.net.sport = uh->source; | |
3539 | ad->u.net.dport = uh->dest; | |
3540 | break; | |
3541 | } | |
3542 | ||
3543 | case IPPROTO_DCCP: { | |
3544 | struct dccp_hdr _dccph, *dh; | |
3545 | ||
3546 | dh = skb_header_pointer(skb, offset, sizeof(_dccph), &_dccph); | |
3547 | if (dh == NULL) | |
3548 | break; | |
3549 | ||
3550 | ad->u.net.sport = dh->dccph_sport; | |
3551 | ad->u.net.dport = dh->dccph_dport; | |
3552 | break; | |
3553 | } | |
3554 | ||
3555 | /* includes fragments */ | |
3556 | default: | |
3557 | break; | |
3558 | } | |
3559 | out: | |
3560 | return ret; | |
3561 | } | |
3562 | ||
3563 | #endif /* IPV6 */ | |
3564 | ||
3565 | static int selinux_parse_skb(struct sk_buff *skb, struct common_audit_data *ad, | |
3566 | char **_addrp, int src, u8 *proto) | |
3567 | { | |
3568 | char *addrp; | |
3569 | int ret; | |
3570 | ||
3571 | switch (ad->u.net.family) { | |
3572 | case PF_INET: | |
3573 | ret = selinux_parse_skb_ipv4(skb, ad, proto); | |
3574 | if (ret) | |
3575 | goto parse_error; | |
3576 | addrp = (char *)(src ? &ad->u.net.v4info.saddr : | |
3577 | &ad->u.net.v4info.daddr); | |
3578 | goto okay; | |
3579 | ||
3580 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
3581 | case PF_INET6: | |
3582 | ret = selinux_parse_skb_ipv6(skb, ad, proto); | |
3583 | if (ret) | |
3584 | goto parse_error; | |
3585 | addrp = (char *)(src ? &ad->u.net.v6info.saddr : | |
3586 | &ad->u.net.v6info.daddr); | |
3587 | goto okay; | |
3588 | #endif /* IPV6 */ | |
3589 | default: | |
3590 | addrp = NULL; | |
3591 | goto okay; | |
3592 | } | |
3593 | ||
3594 | parse_error: | |
3595 | printk(KERN_WARNING | |
3596 | "SELinux: failure in selinux_parse_skb()," | |
3597 | " unable to parse packet\n"); | |
3598 | return ret; | |
3599 | ||
3600 | okay: | |
3601 | if (_addrp) | |
3602 | *_addrp = addrp; | |
3603 | return 0; | |
3604 | } | |
3605 | ||
3606 | /** | |
3607 | * selinux_skb_peerlbl_sid - Determine the peer label of a packet | |
3608 | * @skb: the packet | |
3609 | * @family: protocol family | |
3610 | * @sid: the packet's peer label SID | |
3611 | * | |
3612 | * Description: | |
3613 | * Check the various different forms of network peer labeling and determine | |
3614 | * the peer label/SID for the packet; most of the magic actually occurs in | |
3615 | * the security server function security_net_peersid_cmp(). The function | |
3616 | * returns zero if the value in @sid is valid (although it may be SECSID_NULL) | |
3617 | * or -EACCES if @sid is invalid due to inconsistencies with the different | |
3618 | * peer labels. | |
3619 | * | |
3620 | */ | |
3621 | static int selinux_skb_peerlbl_sid(struct sk_buff *skb, u16 family, u32 *sid) | |
3622 | { | |
3623 | int err; | |
3624 | u32 xfrm_sid; | |
3625 | u32 nlbl_sid; | |
3626 | u32 nlbl_type; | |
3627 | ||
3628 | selinux_skb_xfrm_sid(skb, &xfrm_sid); | |
3629 | selinux_netlbl_skbuff_getsid(skb, family, &nlbl_type, &nlbl_sid); | |
3630 | ||
3631 | err = security_net_peersid_resolve(nlbl_sid, nlbl_type, xfrm_sid, sid); | |
3632 | if (unlikely(err)) { | |
3633 | printk(KERN_WARNING | |
3634 | "SELinux: failure in selinux_skb_peerlbl_sid()," | |
3635 | " unable to determine packet's peer label\n"); | |
3636 | return -EACCES; | |
3637 | } | |
3638 | ||
3639 | return 0; | |
3640 | } | |
3641 | ||
3642 | /* socket security operations */ | |
3643 | ||
3644 | static u32 socket_sockcreate_sid(const struct task_security_struct *tsec) | |
3645 | { | |
3646 | return tsec->sockcreate_sid ? : tsec->sid; | |
3647 | } | |
3648 | ||
3649 | static int sock_has_perm(struct task_struct *task, struct sock *sk, u32 perms) | |
3650 | { | |
3651 | struct sk_security_struct *sksec = sk->sk_security; | |
3652 | struct common_audit_data ad; | |
3653 | u32 tsid = task_sid(task); | |
3654 | ||
3655 | if (sksec->sid == SECINITSID_KERNEL) | |
3656 | return 0; | |
3657 | ||
3658 | COMMON_AUDIT_DATA_INIT(&ad, NET); | |
3659 | ad.u.net.sk = sk; | |
3660 | ||
3661 | return avc_has_perm(tsid, sksec->sid, sksec->sclass, perms, &ad); | |
3662 | } | |
3663 | ||
3664 | static int selinux_socket_create(int family, int type, | |
3665 | int protocol, int kern) | |
3666 | { | |
3667 | const struct task_security_struct *tsec = current_security(); | |
3668 | u32 newsid; | |
3669 | u16 secclass; | |
3670 | ||
3671 | if (kern) | |
3672 | return 0; | |
3673 | ||
3674 | newsid = socket_sockcreate_sid(tsec); | |
3675 | secclass = socket_type_to_security_class(family, type, protocol); | |
3676 | return avc_has_perm(tsec->sid, newsid, secclass, SOCKET__CREATE, NULL); | |
3677 | } | |
3678 | ||
3679 | static int selinux_socket_post_create(struct socket *sock, int family, | |
3680 | int type, int protocol, int kern) | |
3681 | { | |
3682 | const struct task_security_struct *tsec = current_security(); | |
3683 | struct inode_security_struct *isec = SOCK_INODE(sock)->i_security; | |
3684 | struct sk_security_struct *sksec; | |
3685 | int err = 0; | |
3686 | ||
3687 | if (kern) | |
3688 | isec->sid = SECINITSID_KERNEL; | |
3689 | else | |
3690 | isec->sid = socket_sockcreate_sid(tsec); | |
3691 | ||
3692 | isec->sclass = socket_type_to_security_class(family, type, protocol); | |
3693 | isec->initialized = 1; | |
3694 | ||
3695 | if (sock->sk) { | |
3696 | sksec = sock->sk->sk_security; | |
3697 | sksec->sid = isec->sid; | |
3698 | sksec->sclass = isec->sclass; | |
3699 | err = selinux_netlbl_socket_post_create(sock->sk, family); | |
3700 | } | |
3701 | ||
3702 | return err; | |
3703 | } | |
3704 | ||
3705 | /* Range of port numbers used to automatically bind. | |
3706 | Need to determine whether we should perform a name_bind | |
3707 | permission check between the socket and the port number. */ | |
3708 | ||
3709 | static int selinux_socket_bind(struct socket *sock, struct sockaddr *address, int addrlen) | |
3710 | { | |
3711 | struct sock *sk = sock->sk; | |
3712 | u16 family; | |
3713 | int err; | |
3714 | ||
3715 | err = sock_has_perm(current, sk, SOCKET__BIND); | |
3716 | if (err) | |
3717 | goto out; | |
3718 | ||
3719 | /* | |
3720 | * If PF_INET or PF_INET6, check name_bind permission for the port. | |
3721 | * Multiple address binding for SCTP is not supported yet: we just | |
3722 | * check the first address now. | |
3723 | */ | |
3724 | family = sk->sk_family; | |
3725 | if (family == PF_INET || family == PF_INET6) { | |
3726 | char *addrp; | |
3727 | struct sk_security_struct *sksec = sk->sk_security; | |
3728 | struct common_audit_data ad; | |
3729 | struct sockaddr_in *addr4 = NULL; | |
3730 | struct sockaddr_in6 *addr6 = NULL; | |
3731 | unsigned short snum; | |
3732 | u32 sid, node_perm; | |
3733 | ||
3734 | if (family == PF_INET) { | |
3735 | addr4 = (struct sockaddr_in *)address; | |
3736 | snum = ntohs(addr4->sin_port); | |
3737 | addrp = (char *)&addr4->sin_addr.s_addr; | |
3738 | } else { | |
3739 | addr6 = (struct sockaddr_in6 *)address; | |
3740 | snum = ntohs(addr6->sin6_port); | |
3741 | addrp = (char *)&addr6->sin6_addr.s6_addr; | |
3742 | } | |
3743 | ||
3744 | if (snum) { | |
3745 | int low, high; | |
3746 | ||
3747 | inet_get_local_port_range(&low, &high); | |
3748 | ||
3749 | if (snum < max(PROT_SOCK, low) || snum > high) { | |
3750 | err = sel_netport_sid(sk->sk_protocol, | |
3751 | snum, &sid); | |
3752 | if (err) | |
3753 | goto out; | |
3754 | COMMON_AUDIT_DATA_INIT(&ad, NET); | |
3755 | ad.u.net.sport = htons(snum); | |
3756 | ad.u.net.family = family; | |
3757 | err = avc_has_perm(sksec->sid, sid, | |
3758 | sksec->sclass, | |
3759 | SOCKET__NAME_BIND, &ad); | |
3760 | if (err) | |
3761 | goto out; | |
3762 | } | |
3763 | } | |
3764 | ||
3765 | switch (sksec->sclass) { | |
3766 | case SECCLASS_TCP_SOCKET: | |
3767 | node_perm = TCP_SOCKET__NODE_BIND; | |
3768 | break; | |
3769 | ||
3770 | case SECCLASS_UDP_SOCKET: | |
3771 | node_perm = UDP_SOCKET__NODE_BIND; | |
3772 | break; | |
3773 | ||
3774 | case SECCLASS_DCCP_SOCKET: | |
3775 | node_perm = DCCP_SOCKET__NODE_BIND; | |
3776 | break; | |
3777 | ||
3778 | default: | |
3779 | node_perm = RAWIP_SOCKET__NODE_BIND; | |
3780 | break; | |
3781 | } | |
3782 | ||
3783 | err = sel_netnode_sid(addrp, family, &sid); | |
3784 | if (err) | |
3785 | goto out; | |
3786 | ||
3787 | COMMON_AUDIT_DATA_INIT(&ad, NET); | |
3788 | ad.u.net.sport = htons(snum); | |
3789 | ad.u.net.family = family; | |
3790 | ||
3791 | if (family == PF_INET) | |
3792 | ad.u.net.v4info.saddr = addr4->sin_addr.s_addr; | |
3793 | else | |
3794 | ipv6_addr_copy(&ad.u.net.v6info.saddr, &addr6->sin6_addr); | |
3795 | ||
3796 | err = avc_has_perm(sksec->sid, sid, | |
3797 | sksec->sclass, node_perm, &ad); | |
3798 | if (err) | |
3799 | goto out; | |
3800 | } | |
3801 | out: | |
3802 | return err; | |
3803 | } | |
3804 | ||
3805 | static int selinux_socket_connect(struct socket *sock, struct sockaddr *address, int addrlen) | |
3806 | { | |
3807 | struct sock *sk = sock->sk; | |
3808 | struct sk_security_struct *sksec = sk->sk_security; | |
3809 | int err; | |
3810 | ||
3811 | err = sock_has_perm(current, sk, SOCKET__CONNECT); | |
3812 | if (err) | |
3813 | return err; | |
3814 | ||
3815 | /* | |
3816 | * If a TCP or DCCP socket, check name_connect permission for the port. | |
3817 | */ | |
3818 | if (sksec->sclass == SECCLASS_TCP_SOCKET || | |
3819 | sksec->sclass == SECCLASS_DCCP_SOCKET) { | |
3820 | struct common_audit_data ad; | |
3821 | struct sockaddr_in *addr4 = NULL; | |
3822 | struct sockaddr_in6 *addr6 = NULL; | |
3823 | unsigned short snum; | |
3824 | u32 sid, perm; | |
3825 | ||
3826 | if (sk->sk_family == PF_INET) { | |
3827 | addr4 = (struct sockaddr_in *)address; | |
3828 | if (addrlen < sizeof(struct sockaddr_in)) | |
3829 | return -EINVAL; | |
3830 | snum = ntohs(addr4->sin_port); | |
3831 | } else { | |
3832 | addr6 = (struct sockaddr_in6 *)address; | |
3833 | if (addrlen < SIN6_LEN_RFC2133) | |
3834 | return -EINVAL; | |
3835 | snum = ntohs(addr6->sin6_port); | |
3836 | } | |
3837 | ||
3838 | err = sel_netport_sid(sk->sk_protocol, snum, &sid); | |
3839 | if (err) | |
3840 | goto out; | |
3841 | ||
3842 | perm = (sksec->sclass == SECCLASS_TCP_SOCKET) ? | |
3843 | TCP_SOCKET__NAME_CONNECT : DCCP_SOCKET__NAME_CONNECT; | |
3844 | ||
3845 | COMMON_AUDIT_DATA_INIT(&ad, NET); | |
3846 | ad.u.net.dport = htons(snum); | |
3847 | ad.u.net.family = sk->sk_family; | |
3848 | err = avc_has_perm(sksec->sid, sid, sksec->sclass, perm, &ad); | |
3849 | if (err) | |
3850 | goto out; | |
3851 | } | |
3852 | ||
3853 | err = selinux_netlbl_socket_connect(sk, address); | |
3854 | ||
3855 | out: | |
3856 | return err; | |
3857 | } | |
3858 | ||
3859 | static int selinux_socket_listen(struct socket *sock, int backlog) | |
3860 | { | |
3861 | return sock_has_perm(current, sock->sk, SOCKET__LISTEN); | |
3862 | } | |
3863 | ||
3864 | static int selinux_socket_accept(struct socket *sock, struct socket *newsock) | |
3865 | { | |
3866 | int err; | |
3867 | struct inode_security_struct *isec; | |
3868 | struct inode_security_struct *newisec; | |
3869 | ||
3870 | err = sock_has_perm(current, sock->sk, SOCKET__ACCEPT); | |
3871 | if (err) | |
3872 | return err; | |
3873 | ||
3874 | newisec = SOCK_INODE(newsock)->i_security; | |
3875 | ||
3876 | isec = SOCK_INODE(sock)->i_security; | |
3877 | newisec->sclass = isec->sclass; | |
3878 | newisec->sid = isec->sid; | |
3879 | newisec->initialized = 1; | |
3880 | ||
3881 | return 0; | |
3882 | } | |
3883 | ||
3884 | static int selinux_socket_sendmsg(struct socket *sock, struct msghdr *msg, | |
3885 | int size) | |
3886 | { | |
3887 | return sock_has_perm(current, sock->sk, SOCKET__WRITE); | |
3888 | } | |
3889 | ||
3890 | static int selinux_socket_recvmsg(struct socket *sock, struct msghdr *msg, | |
3891 | int size, int flags) | |
3892 | { | |
3893 | return sock_has_perm(current, sock->sk, SOCKET__READ); | |
3894 | } | |
3895 | ||
3896 | static int selinux_socket_getsockname(struct socket *sock) | |
3897 | { | |
3898 | return sock_has_perm(current, sock->sk, SOCKET__GETATTR); | |
3899 | } | |
3900 | ||
3901 | static int selinux_socket_getpeername(struct socket *sock) | |
3902 | { | |
3903 | return sock_has_perm(current, sock->sk, SOCKET__GETATTR); | |
3904 | } | |
3905 | ||
3906 | static int selinux_socket_setsockopt(struct socket *sock, int level, int optname) | |
3907 | { | |
3908 | int err; | |
3909 | ||
3910 | err = sock_has_perm(current, sock->sk, SOCKET__SETOPT); | |
3911 | if (err) | |
3912 | return err; | |
3913 | ||
3914 | return selinux_netlbl_socket_setsockopt(sock, level, optname); | |
3915 | } | |
3916 | ||
3917 | static int selinux_socket_getsockopt(struct socket *sock, int level, | |
3918 | int optname) | |
3919 | { | |
3920 | return sock_has_perm(current, sock->sk, SOCKET__GETOPT); | |
3921 | } | |
3922 | ||
3923 | static int selinux_socket_shutdown(struct socket *sock, int how) | |
3924 | { | |
3925 | return sock_has_perm(current, sock->sk, SOCKET__SHUTDOWN); | |
3926 | } | |
3927 | ||
3928 | static int selinux_socket_unix_stream_connect(struct socket *sock, | |
3929 | struct socket *other, | |
3930 | struct sock *newsk) | |
3931 | { | |
3932 | struct sk_security_struct *sksec_sock = sock->sk->sk_security; | |
3933 | struct sk_security_struct *sksec_other = other->sk->sk_security; | |
3934 | struct sk_security_struct *sksec_new = newsk->sk_security; | |
3935 | struct common_audit_data ad; | |
3936 | int err; | |
3937 | ||
3938 | COMMON_AUDIT_DATA_INIT(&ad, NET); | |
3939 | ad.u.net.sk = other->sk; | |
3940 | ||
3941 | err = avc_has_perm(sksec_sock->sid, sksec_other->sid, | |
3942 | sksec_other->sclass, | |
3943 | UNIX_STREAM_SOCKET__CONNECTTO, &ad); | |
3944 | if (err) | |
3945 | return err; | |
3946 | ||
3947 | /* server child socket */ | |
3948 | sksec_new->peer_sid = sksec_sock->sid; | |
3949 | err = security_sid_mls_copy(sksec_other->sid, sksec_sock->sid, | |
3950 | &sksec_new->sid); | |
3951 | if (err) | |
3952 | return err; | |
3953 | ||
3954 | /* connecting socket */ | |
3955 | sksec_sock->peer_sid = sksec_new->sid; | |
3956 | ||
3957 | return 0; | |
3958 | } | |
3959 | ||
3960 | static int selinux_socket_unix_may_send(struct socket *sock, | |
3961 | struct socket *other) | |
3962 | { | |
3963 | struct sk_security_struct *ssec = sock->sk->sk_security; | |
3964 | struct sk_security_struct *osec = other->sk->sk_security; | |
3965 | struct common_audit_data ad; | |
3966 | ||
3967 | COMMON_AUDIT_DATA_INIT(&ad, NET); | |
3968 | ad.u.net.sk = other->sk; | |
3969 | ||
3970 | return avc_has_perm(ssec->sid, osec->sid, osec->sclass, SOCKET__SENDTO, | |
3971 | &ad); | |
3972 | } | |
3973 | ||
3974 | static int selinux_inet_sys_rcv_skb(int ifindex, char *addrp, u16 family, | |
3975 | u32 peer_sid, | |
3976 | struct common_audit_data *ad) | |
3977 | { | |
3978 | int err; | |
3979 | u32 if_sid; | |
3980 | u32 node_sid; | |
3981 | ||
3982 | err = sel_netif_sid(ifindex, &if_sid); | |
3983 | if (err) | |
3984 | return err; | |
3985 | err = avc_has_perm(peer_sid, if_sid, | |
3986 | SECCLASS_NETIF, NETIF__INGRESS, ad); | |
3987 | if (err) | |
3988 | return err; | |
3989 | ||
3990 | err = sel_netnode_sid(addrp, family, &node_sid); | |
3991 | if (err) | |
3992 | return err; | |
3993 | return avc_has_perm(peer_sid, node_sid, | |
3994 | SECCLASS_NODE, NODE__RECVFROM, ad); | |
3995 | } | |
3996 | ||
3997 | static int selinux_sock_rcv_skb_compat(struct sock *sk, struct sk_buff *skb, | |
3998 | u16 family) | |
3999 | { | |
4000 | int err = 0; | |
4001 | struct sk_security_struct *sksec = sk->sk_security; | |
4002 | u32 peer_sid; | |
4003 | u32 sk_sid = sksec->sid; | |
4004 | struct common_audit_data ad; | |
4005 | char *addrp; | |
4006 | ||
4007 | COMMON_AUDIT_DATA_INIT(&ad, NET); | |
4008 | ad.u.net.netif = skb->skb_iif; | |
4009 | ad.u.net.family = family; | |
4010 | err = selinux_parse_skb(skb, &ad, &addrp, 1, NULL); | |
4011 | if (err) | |
4012 | return err; | |
4013 | ||
4014 | if (selinux_secmark_enabled()) { | |
4015 | err = avc_has_perm(sk_sid, skb->secmark, SECCLASS_PACKET, | |
4016 | PACKET__RECV, &ad); | |
4017 | if (err) | |
4018 | return err; | |
4019 | } | |
4020 | ||
4021 | if (selinux_policycap_netpeer) { | |
4022 | err = selinux_skb_peerlbl_sid(skb, family, &peer_sid); | |
4023 | if (err) | |
4024 | return err; | |
4025 | err = avc_has_perm(sk_sid, peer_sid, | |
4026 | SECCLASS_PEER, PEER__RECV, &ad); | |
4027 | if (err) | |
4028 | selinux_netlbl_err(skb, err, 0); | |
4029 | } else { | |
4030 | err = selinux_netlbl_sock_rcv_skb(sksec, skb, family, &ad); | |
4031 | if (err) | |
4032 | return err; | |
4033 | err = selinux_xfrm_sock_rcv_skb(sksec->sid, skb, &ad); | |
4034 | } | |
4035 | ||
4036 | return err; | |
4037 | } | |
4038 | ||
4039 | static int selinux_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb) | |
4040 | { | |
4041 | int err; | |
4042 | struct sk_security_struct *sksec = sk->sk_security; | |
4043 | u16 family = sk->sk_family; | |
4044 | u32 sk_sid = sksec->sid; | |
4045 | struct common_audit_data ad; | |
4046 | char *addrp; | |
4047 | u8 secmark_active; | |
4048 | u8 peerlbl_active; | |
4049 | ||
4050 | if (family != PF_INET && family != PF_INET6) | |
4051 | return 0; | |
4052 | ||
4053 | /* Handle mapped IPv4 packets arriving via IPv6 sockets */ | |
4054 | if (family == PF_INET6 && skb->protocol == htons(ETH_P_IP)) | |
4055 | family = PF_INET; | |
4056 | ||
4057 | /* If any sort of compatibility mode is enabled then handoff processing | |
4058 | * to the selinux_sock_rcv_skb_compat() function to deal with the | |
4059 | * special handling. We do this in an attempt to keep this function | |
4060 | * as fast and as clean as possible. */ | |
4061 | if (!selinux_policycap_netpeer) | |
4062 | return selinux_sock_rcv_skb_compat(sk, skb, family); | |
4063 | ||
4064 | secmark_active = selinux_secmark_enabled(); | |
4065 | peerlbl_active = netlbl_enabled() || selinux_xfrm_enabled(); | |
4066 | if (!secmark_active && !peerlbl_active) | |
4067 | return 0; | |
4068 | ||
4069 | COMMON_AUDIT_DATA_INIT(&ad, NET); | |
4070 | ad.u.net.netif = skb->skb_iif; | |
4071 | ad.u.net.family = family; | |
4072 | err = selinux_parse_skb(skb, &ad, &addrp, 1, NULL); | |
4073 | if (err) | |
4074 | return err; | |
4075 | ||
4076 | if (peerlbl_active) { | |
4077 | u32 peer_sid; | |
4078 | ||
4079 | err = selinux_skb_peerlbl_sid(skb, family, &peer_sid); | |
4080 | if (err) | |
4081 | return err; | |
4082 | err = selinux_inet_sys_rcv_skb(skb->skb_iif, addrp, family, | |
4083 | peer_sid, &ad); | |
4084 | if (err) { | |
4085 | selinux_netlbl_err(skb, err, 0); | |
4086 | return err; | |
4087 | } | |
4088 | err = avc_has_perm(sk_sid, peer_sid, SECCLASS_PEER, | |
4089 | PEER__RECV, &ad); | |
4090 | if (err) | |
4091 | selinux_netlbl_err(skb, err, 0); | |
4092 | } | |
4093 | ||
4094 | if (secmark_active) { | |
4095 | err = avc_has_perm(sk_sid, skb->secmark, SECCLASS_PACKET, | |
4096 | PACKET__RECV, &ad); | |
4097 | if (err) | |
4098 | return err; | |
4099 | } | |
4100 | ||
4101 | return err; | |
4102 | } | |
4103 | ||
4104 | static int selinux_socket_getpeersec_stream(struct socket *sock, char __user *optval, | |
4105 | int __user *optlen, unsigned len) | |
4106 | { | |
4107 | int err = 0; | |
4108 | char *scontext; | |
4109 | u32 scontext_len; | |
4110 | struct sk_security_struct *sksec = sock->sk->sk_security; | |
4111 | u32 peer_sid = SECSID_NULL; | |
4112 | ||
4113 | if (sksec->sclass == SECCLASS_UNIX_STREAM_SOCKET || | |
4114 | sksec->sclass == SECCLASS_TCP_SOCKET) | |
4115 | peer_sid = sksec->peer_sid; | |
4116 | if (peer_sid == SECSID_NULL) | |
4117 | return -ENOPROTOOPT; | |
4118 | ||
4119 | err = security_sid_to_context(peer_sid, &scontext, &scontext_len); | |
4120 | if (err) | |
4121 | return err; | |
4122 | ||
4123 | if (scontext_len > len) { | |
4124 | err = -ERANGE; | |
4125 | goto out_len; | |
4126 | } | |
4127 | ||
4128 | if (copy_to_user(optval, scontext, scontext_len)) | |
4129 | err = -EFAULT; | |
4130 | ||
4131 | out_len: | |
4132 | if (put_user(scontext_len, optlen)) | |
4133 | err = -EFAULT; | |
4134 | kfree(scontext); | |
4135 | return err; | |
4136 | } | |
4137 | ||
4138 | static int selinux_socket_getpeersec_dgram(struct socket *sock, struct sk_buff *skb, u32 *secid) | |
4139 | { | |
4140 | u32 peer_secid = SECSID_NULL; | |
4141 | u16 family; | |
4142 | ||
4143 | if (skb && skb->protocol == htons(ETH_P_IP)) | |
4144 | family = PF_INET; | |
4145 | else if (skb && skb->protocol == htons(ETH_P_IPV6)) | |
4146 | family = PF_INET6; | |
4147 | else if (sock) | |
4148 | family = sock->sk->sk_family; | |
4149 | else | |
4150 | goto out; | |
4151 | ||
4152 | if (sock && family == PF_UNIX) | |
4153 | selinux_inode_getsecid(SOCK_INODE(sock), &peer_secid); | |
4154 | else if (skb) | |
4155 | selinux_skb_peerlbl_sid(skb, family, &peer_secid); | |
4156 | ||
4157 | out: | |
4158 | *secid = peer_secid; | |
4159 | if (peer_secid == SECSID_NULL) | |
4160 | return -EINVAL; | |
4161 | return 0; | |
4162 | } | |
4163 | ||
4164 | static int selinux_sk_alloc_security(struct sock *sk, int family, gfp_t priority) | |
4165 | { | |
4166 | struct sk_security_struct *sksec; | |
4167 | ||
4168 | sksec = kzalloc(sizeof(*sksec), priority); | |
4169 | if (!sksec) | |
4170 | return -ENOMEM; | |
4171 | ||
4172 | sksec->peer_sid = SECINITSID_UNLABELED; | |
4173 | sksec->sid = SECINITSID_UNLABELED; | |
4174 | selinux_netlbl_sk_security_reset(sksec); | |
4175 | sk->sk_security = sksec; | |
4176 | ||
4177 | return 0; | |
4178 | } | |
4179 | ||
4180 | static void selinux_sk_free_security(struct sock *sk) | |
4181 | { | |
4182 | struct sk_security_struct *sksec = sk->sk_security; | |
4183 | ||
4184 | sk->sk_security = NULL; | |
4185 | selinux_netlbl_sk_security_free(sksec); | |
4186 | kfree(sksec); | |
4187 | } | |
4188 | ||
4189 | static void selinux_sk_clone_security(const struct sock *sk, struct sock *newsk) | |
4190 | { | |
4191 | struct sk_security_struct *sksec = sk->sk_security; | |
4192 | struct sk_security_struct *newsksec = newsk->sk_security; | |
4193 | ||
4194 | newsksec->sid = sksec->sid; | |
4195 | newsksec->peer_sid = sksec->peer_sid; | |
4196 | newsksec->sclass = sksec->sclass; | |
4197 | ||
4198 | selinux_netlbl_sk_security_reset(newsksec); | |
4199 | } | |
4200 | ||
4201 | static void selinux_sk_getsecid(struct sock *sk, u32 *secid) | |
4202 | { | |
4203 | if (!sk) | |
4204 | *secid = SECINITSID_ANY_SOCKET; | |
4205 | else { | |
4206 | struct sk_security_struct *sksec = sk->sk_security; | |
4207 | ||
4208 | *secid = sksec->sid; | |
4209 | } | |
4210 | } | |
4211 | ||
4212 | static void selinux_sock_graft(struct sock *sk, struct socket *parent) | |
4213 | { | |
4214 | struct inode_security_struct *isec = SOCK_INODE(parent)->i_security; | |
4215 | struct sk_security_struct *sksec = sk->sk_security; | |
4216 | ||
4217 | if (sk->sk_family == PF_INET || sk->sk_family == PF_INET6 || | |
4218 | sk->sk_family == PF_UNIX) | |
4219 | isec->sid = sksec->sid; | |
4220 | sksec->sclass = isec->sclass; | |
4221 | } | |
4222 | ||
4223 | static int selinux_inet_conn_request(struct sock *sk, struct sk_buff *skb, | |
4224 | struct request_sock *req) | |
4225 | { | |
4226 | struct sk_security_struct *sksec = sk->sk_security; | |
4227 | int err; | |
4228 | u16 family = sk->sk_family; | |
4229 | u32 newsid; | |
4230 | u32 peersid; | |
4231 | ||
4232 | /* handle mapped IPv4 packets arriving via IPv6 sockets */ | |
4233 | if (family == PF_INET6 && skb->protocol == htons(ETH_P_IP)) | |
4234 | family = PF_INET; | |
4235 | ||
4236 | err = selinux_skb_peerlbl_sid(skb, family, &peersid); | |
4237 | if (err) | |
4238 | return err; | |
4239 | if (peersid == SECSID_NULL) { | |
4240 | req->secid = sksec->sid; | |
4241 | req->peer_secid = SECSID_NULL; | |
4242 | } else { | |
4243 | err = security_sid_mls_copy(sksec->sid, peersid, &newsid); | |
4244 | if (err) | |
4245 | return err; | |
4246 | req->secid = newsid; | |
4247 | req->peer_secid = peersid; | |
4248 | } | |
4249 | ||
4250 | return selinux_netlbl_inet_conn_request(req, family); | |
4251 | } | |
4252 | ||
4253 | static void selinux_inet_csk_clone(struct sock *newsk, | |
4254 | const struct request_sock *req) | |
4255 | { | |
4256 | struct sk_security_struct *newsksec = newsk->sk_security; | |
4257 | ||
4258 | newsksec->sid = req->secid; | |
4259 | newsksec->peer_sid = req->peer_secid; | |
4260 | /* NOTE: Ideally, we should also get the isec->sid for the | |
4261 | new socket in sync, but we don't have the isec available yet. | |
4262 | So we will wait until sock_graft to do it, by which | |
4263 | time it will have been created and available. */ | |
4264 | ||
4265 | /* We don't need to take any sort of lock here as we are the only | |
4266 | * thread with access to newsksec */ | |
4267 | selinux_netlbl_inet_csk_clone(newsk, req->rsk_ops->family); | |
4268 | } | |
4269 | ||
4270 | static void selinux_inet_conn_established(struct sock *sk, struct sk_buff *skb) | |
4271 | { | |
4272 | u16 family = sk->sk_family; | |
4273 | struct sk_security_struct *sksec = sk->sk_security; | |
4274 | ||
4275 | /* handle mapped IPv4 packets arriving via IPv6 sockets */ | |
4276 | if (family == PF_INET6 && skb->protocol == htons(ETH_P_IP)) | |
4277 | family = PF_INET; | |
4278 | ||
4279 | selinux_skb_peerlbl_sid(skb, family, &sksec->peer_sid); | |
4280 | } | |
4281 | ||
4282 | static int selinux_secmark_relabel_packet(u32 sid) | |
4283 | { | |
4284 | const struct task_security_struct *__tsec; | |
4285 | u32 tsid; | |
4286 | ||
4287 | __tsec = current_security(); | |
4288 | tsid = __tsec->sid; | |
4289 | ||
4290 | return avc_has_perm(tsid, sid, SECCLASS_PACKET, PACKET__RELABELTO, NULL); | |
4291 | } | |
4292 | ||
4293 | static void selinux_secmark_refcount_inc(void) | |
4294 | { | |
4295 | atomic_inc(&selinux_secmark_refcount); | |
4296 | } | |
4297 | ||
4298 | static void selinux_secmark_refcount_dec(void) | |
4299 | { | |
4300 | atomic_dec(&selinux_secmark_refcount); | |
4301 | } | |
4302 | ||
4303 | static void selinux_req_classify_flow(const struct request_sock *req, | |
4304 | struct flowi *fl) | |
4305 | { | |
4306 | fl->secid = req->secid; | |
4307 | } | |
4308 | ||
4309 | static int selinux_tun_dev_create(void) | |
4310 | { | |
4311 | u32 sid = current_sid(); | |
4312 | ||
4313 | /* we aren't taking into account the "sockcreate" SID since the socket | |
4314 | * that is being created here is not a socket in the traditional sense, | |
4315 | * instead it is a private sock, accessible only to the kernel, and | |
4316 | * representing a wide range of network traffic spanning multiple | |
4317 | * connections unlike traditional sockets - check the TUN driver to | |
4318 | * get a better understanding of why this socket is special */ | |
4319 | ||
4320 | return avc_has_perm(sid, sid, SECCLASS_TUN_SOCKET, TUN_SOCKET__CREATE, | |
4321 | NULL); | |
4322 | } | |
4323 | ||
4324 | static void selinux_tun_dev_post_create(struct sock *sk) | |
4325 | { | |
4326 | struct sk_security_struct *sksec = sk->sk_security; | |
4327 | ||
4328 | /* we don't currently perform any NetLabel based labeling here and it | |
4329 | * isn't clear that we would want to do so anyway; while we could apply | |
4330 | * labeling without the support of the TUN user the resulting labeled | |
4331 | * traffic from the other end of the connection would almost certainly | |
4332 | * cause confusion to the TUN user that had no idea network labeling | |
4333 | * protocols were being used */ | |
4334 | ||
4335 | /* see the comments in selinux_tun_dev_create() about why we don't use | |
4336 | * the sockcreate SID here */ | |
4337 | ||
4338 | sksec->sid = current_sid(); | |
4339 | sksec->sclass = SECCLASS_TUN_SOCKET; | |
4340 | } | |
4341 | ||
4342 | static int selinux_tun_dev_attach(struct sock *sk) | |
4343 | { | |
4344 | struct sk_security_struct *sksec = sk->sk_security; | |
4345 | u32 sid = current_sid(); | |
4346 | int err; | |
4347 | ||
4348 | err = avc_has_perm(sid, sksec->sid, SECCLASS_TUN_SOCKET, | |
4349 | TUN_SOCKET__RELABELFROM, NULL); | |
4350 | if (err) | |
4351 | return err; | |
4352 | err = avc_has_perm(sid, sid, SECCLASS_TUN_SOCKET, | |
4353 | TUN_SOCKET__RELABELTO, NULL); | |
4354 | if (err) | |
4355 | return err; | |
4356 | ||
4357 | sksec->sid = sid; | |
4358 | ||
4359 | return 0; | |
4360 | } | |
4361 | ||
4362 | static int selinux_nlmsg_perm(struct sock *sk, struct sk_buff *skb) | |
4363 | { | |
4364 | int err = 0; | |
4365 | u32 perm; | |
4366 | struct nlmsghdr *nlh; | |
4367 | struct sk_security_struct *sksec = sk->sk_security; | |
4368 | ||
4369 | if (skb->len < NLMSG_SPACE(0)) { | |
4370 | err = -EINVAL; | |
4371 | goto out; | |
4372 | } | |
4373 | nlh = nlmsg_hdr(skb); | |
4374 | ||
4375 | err = selinux_nlmsg_lookup(sksec->sclass, nlh->nlmsg_type, &perm); | |
4376 | if (err) { | |
4377 | if (err == -EINVAL) { | |
4378 | audit_log(current->audit_context, GFP_KERNEL, AUDIT_SELINUX_ERR, | |
4379 | "SELinux: unrecognized netlink message" | |
4380 | " type=%hu for sclass=%hu\n", | |
4381 | nlh->nlmsg_type, sksec->sclass); | |
4382 | if (!selinux_enforcing || security_get_allow_unknown()) | |
4383 | err = 0; | |
4384 | } | |
4385 | ||
4386 | /* Ignore */ | |
4387 | if (err == -ENOENT) | |
4388 | err = 0; | |
4389 | goto out; | |
4390 | } | |
4391 | ||
4392 | err = sock_has_perm(current, sk, perm); | |
4393 | out: | |
4394 | return err; | |
4395 | } | |
4396 | ||
4397 | #ifdef CONFIG_NETFILTER | |
4398 | ||
4399 | static unsigned int selinux_ip_forward(struct sk_buff *skb, int ifindex, | |
4400 | u16 family) | |
4401 | { | |
4402 | int err; | |
4403 | char *addrp; | |
4404 | u32 peer_sid; | |
4405 | struct common_audit_data ad; | |
4406 | u8 secmark_active; | |
4407 | u8 netlbl_active; | |
4408 | u8 peerlbl_active; | |
4409 | ||
4410 | if (!selinux_policycap_netpeer) | |
4411 | return NF_ACCEPT; | |
4412 | ||
4413 | secmark_active = selinux_secmark_enabled(); | |
4414 | netlbl_active = netlbl_enabled(); | |
4415 | peerlbl_active = netlbl_active || selinux_xfrm_enabled(); | |
4416 | if (!secmark_active && !peerlbl_active) | |
4417 | return NF_ACCEPT; | |
4418 | ||
4419 | if (selinux_skb_peerlbl_sid(skb, family, &peer_sid) != 0) | |
4420 | return NF_DROP; | |
4421 | ||
4422 | COMMON_AUDIT_DATA_INIT(&ad, NET); | |
4423 | ad.u.net.netif = ifindex; | |
4424 | ad.u.net.family = family; | |
4425 | if (selinux_parse_skb(skb, &ad, &addrp, 1, NULL) != 0) | |
4426 | return NF_DROP; | |
4427 | ||
4428 | if (peerlbl_active) { | |
4429 | err = selinux_inet_sys_rcv_skb(ifindex, addrp, family, | |
4430 | peer_sid, &ad); | |
4431 | if (err) { | |
4432 | selinux_netlbl_err(skb, err, 1); | |
4433 | return NF_DROP; | |
4434 | } | |
4435 | } | |
4436 | ||
4437 | if (secmark_active) | |
4438 | if (avc_has_perm(peer_sid, skb->secmark, | |
4439 | SECCLASS_PACKET, PACKET__FORWARD_IN, &ad)) | |
4440 | return NF_DROP; | |
4441 | ||
4442 | if (netlbl_active) | |
4443 | /* we do this in the FORWARD path and not the POST_ROUTING | |
4444 | * path because we want to make sure we apply the necessary | |
4445 | * labeling before IPsec is applied so we can leverage AH | |
4446 | * protection */ | |
4447 | if (selinux_netlbl_skbuff_setsid(skb, family, peer_sid) != 0) | |
4448 | return NF_DROP; | |
4449 | ||
4450 | return NF_ACCEPT; | |
4451 | } | |
4452 | ||
4453 | static unsigned int selinux_ipv4_forward(unsigned int hooknum, | |
4454 | struct sk_buff *skb, | |
4455 | const struct net_device *in, | |
4456 | const struct net_device *out, | |
4457 | int (*okfn)(struct sk_buff *)) | |
4458 | { | |
4459 | return selinux_ip_forward(skb, in->ifindex, PF_INET); | |
4460 | } | |
4461 | ||
4462 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
4463 | static unsigned int selinux_ipv6_forward(unsigned int hooknum, | |
4464 | struct sk_buff *skb, | |
4465 | const struct net_device *in, | |
4466 | const struct net_device *out, | |
4467 | int (*okfn)(struct sk_buff *)) | |
4468 | { | |
4469 | return selinux_ip_forward(skb, in->ifindex, PF_INET6); | |
4470 | } | |
4471 | #endif /* IPV6 */ | |
4472 | ||
4473 | static unsigned int selinux_ip_output(struct sk_buff *skb, | |
4474 | u16 family) | |
4475 | { | |
4476 | u32 sid; | |
4477 | ||
4478 | if (!netlbl_enabled()) | |
4479 | return NF_ACCEPT; | |
4480 | ||
4481 | /* we do this in the LOCAL_OUT path and not the POST_ROUTING path | |
4482 | * because we want to make sure we apply the necessary labeling | |
4483 | * before IPsec is applied so we can leverage AH protection */ | |
4484 | if (skb->sk) { | |
4485 | struct sk_security_struct *sksec = skb->sk->sk_security; | |
4486 | sid = sksec->sid; | |
4487 | } else | |
4488 | sid = SECINITSID_KERNEL; | |
4489 | if (selinux_netlbl_skbuff_setsid(skb, family, sid) != 0) | |
4490 | return NF_DROP; | |
4491 | ||
4492 | return NF_ACCEPT; | |
4493 | } | |
4494 | ||
4495 | static unsigned int selinux_ipv4_output(unsigned int hooknum, | |
4496 | struct sk_buff *skb, | |
4497 | const struct net_device *in, | |
4498 | const struct net_device *out, | |
4499 | int (*okfn)(struct sk_buff *)) | |
4500 | { | |
4501 | return selinux_ip_output(skb, PF_INET); | |
4502 | } | |
4503 | ||
4504 | static unsigned int selinux_ip_postroute_compat(struct sk_buff *skb, | |
4505 | int ifindex, | |
4506 | u16 family) | |
4507 | { | |
4508 | struct sock *sk = skb->sk; | |
4509 | struct sk_security_struct *sksec; | |
4510 | struct common_audit_data ad; | |
4511 | char *addrp; | |
4512 | u8 proto; | |
4513 | ||
4514 | if (sk == NULL) | |
4515 | return NF_ACCEPT; | |
4516 | sksec = sk->sk_security; | |
4517 | ||
4518 | COMMON_AUDIT_DATA_INIT(&ad, NET); | |
4519 | ad.u.net.netif = ifindex; | |
4520 | ad.u.net.family = family; | |
4521 | if (selinux_parse_skb(skb, &ad, &addrp, 0, &proto)) | |
4522 | return NF_DROP; | |
4523 | ||
4524 | if (selinux_secmark_enabled()) | |
4525 | if (avc_has_perm(sksec->sid, skb->secmark, | |
4526 | SECCLASS_PACKET, PACKET__SEND, &ad)) | |
4527 | return NF_DROP_ERR(-ECONNREFUSED); | |
4528 | ||
4529 | if (selinux_policycap_netpeer) | |
4530 | if (selinux_xfrm_postroute_last(sksec->sid, skb, &ad, proto)) | |
4531 | return NF_DROP_ERR(-ECONNREFUSED); | |
4532 | ||
4533 | return NF_ACCEPT; | |
4534 | } | |
4535 | ||
4536 | static unsigned int selinux_ip_postroute(struct sk_buff *skb, int ifindex, | |
4537 | u16 family) | |
4538 | { | |
4539 | u32 secmark_perm; | |
4540 | u32 peer_sid; | |
4541 | struct sock *sk; | |
4542 | struct common_audit_data ad; | |
4543 | char *addrp; | |
4544 | u8 secmark_active; | |
4545 | u8 peerlbl_active; | |
4546 | ||
4547 | /* If any sort of compatibility mode is enabled then handoff processing | |
4548 | * to the selinux_ip_postroute_compat() function to deal with the | |
4549 | * special handling. We do this in an attempt to keep this function | |
4550 | * as fast and as clean as possible. */ | |
4551 | if (!selinux_policycap_netpeer) | |
4552 | return selinux_ip_postroute_compat(skb, ifindex, family); | |
4553 | #ifdef CONFIG_XFRM | |
4554 | /* If skb->dst->xfrm is non-NULL then the packet is undergoing an IPsec | |
4555 | * packet transformation so allow the packet to pass without any checks | |
4556 | * since we'll have another chance to perform access control checks | |
4557 | * when the packet is on it's final way out. | |
4558 | * NOTE: there appear to be some IPv6 multicast cases where skb->dst | |
4559 | * is NULL, in this case go ahead and apply access control. */ | |
4560 | if (skb_dst(skb) != NULL && skb_dst(skb)->xfrm != NULL) | |
4561 | return NF_ACCEPT; | |
4562 | #endif | |
4563 | secmark_active = selinux_secmark_enabled(); | |
4564 | peerlbl_active = netlbl_enabled() || selinux_xfrm_enabled(); | |
4565 | if (!secmark_active && !peerlbl_active) | |
4566 | return NF_ACCEPT; | |
4567 | ||
4568 | /* if the packet is being forwarded then get the peer label from the | |
4569 | * packet itself; otherwise check to see if it is from a local | |
4570 | * application or the kernel, if from an application get the peer label | |
4571 | * from the sending socket, otherwise use the kernel's sid */ | |
4572 | sk = skb->sk; | |
4573 | if (sk == NULL) { | |
4574 | switch (family) { | |
4575 | case PF_INET: | |
4576 | if (IPCB(skb)->flags & IPSKB_FORWARDED) | |
4577 | secmark_perm = PACKET__FORWARD_OUT; | |
4578 | else | |
4579 | secmark_perm = PACKET__SEND; | |
4580 | break; | |
4581 | case PF_INET6: | |
4582 | if (IP6CB(skb)->flags & IP6SKB_FORWARDED) | |
4583 | secmark_perm = PACKET__FORWARD_OUT; | |
4584 | else | |
4585 | secmark_perm = PACKET__SEND; | |
4586 | break; | |
4587 | default: | |
4588 | return NF_DROP_ERR(-ECONNREFUSED); | |
4589 | } | |
4590 | if (secmark_perm == PACKET__FORWARD_OUT) { | |
4591 | if (selinux_skb_peerlbl_sid(skb, family, &peer_sid)) | |
4592 | return NF_DROP; | |
4593 | } else | |
4594 | peer_sid = SECINITSID_KERNEL; | |
4595 | } else { | |
4596 | struct sk_security_struct *sksec = sk->sk_security; | |
4597 | peer_sid = sksec->sid; | |
4598 | secmark_perm = PACKET__SEND; | |
4599 | } | |
4600 | ||
4601 | COMMON_AUDIT_DATA_INIT(&ad, NET); | |
4602 | ad.u.net.netif = ifindex; | |
4603 | ad.u.net.family = family; | |
4604 | if (selinux_parse_skb(skb, &ad, &addrp, 0, NULL)) | |
4605 | return NF_DROP; | |
4606 | ||
4607 | if (secmark_active) | |
4608 | if (avc_has_perm(peer_sid, skb->secmark, | |
4609 | SECCLASS_PACKET, secmark_perm, &ad)) | |
4610 | return NF_DROP_ERR(-ECONNREFUSED); | |
4611 | ||
4612 | if (peerlbl_active) { | |
4613 | u32 if_sid; | |
4614 | u32 node_sid; | |
4615 | ||
4616 | if (sel_netif_sid(ifindex, &if_sid)) | |
4617 | return NF_DROP; | |
4618 | if (avc_has_perm(peer_sid, if_sid, | |
4619 | SECCLASS_NETIF, NETIF__EGRESS, &ad)) | |
4620 | return NF_DROP_ERR(-ECONNREFUSED); | |
4621 | ||
4622 | if (sel_netnode_sid(addrp, family, &node_sid)) | |
4623 | return NF_DROP; | |
4624 | if (avc_has_perm(peer_sid, node_sid, | |
4625 | SECCLASS_NODE, NODE__SENDTO, &ad)) | |
4626 | return NF_DROP_ERR(-ECONNREFUSED); | |
4627 | } | |
4628 | ||
4629 | return NF_ACCEPT; | |
4630 | } | |
4631 | ||
4632 | static unsigned int selinux_ipv4_postroute(unsigned int hooknum, | |
4633 | struct sk_buff *skb, | |
4634 | const struct net_device *in, | |
4635 | const struct net_device *out, | |
4636 | int (*okfn)(struct sk_buff *)) | |
4637 | { | |
4638 | return selinux_ip_postroute(skb, out->ifindex, PF_INET); | |
4639 | } | |
4640 | ||
4641 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
4642 | static unsigned int selinux_ipv6_postroute(unsigned int hooknum, | |
4643 | struct sk_buff *skb, | |
4644 | const struct net_device *in, | |
4645 | const struct net_device *out, | |
4646 | int (*okfn)(struct sk_buff *)) | |
4647 | { | |
4648 | return selinux_ip_postroute(skb, out->ifindex, PF_INET6); | |
4649 | } | |
4650 | #endif /* IPV6 */ | |
4651 | ||
4652 | #endif /* CONFIG_NETFILTER */ | |
4653 | ||
4654 | static int selinux_netlink_send(struct sock *sk, struct sk_buff *skb) | |
4655 | { | |
4656 | int err; | |
4657 | ||
4658 | err = cap_netlink_send(sk, skb); | |
4659 | if (err) | |
4660 | return err; | |
4661 | ||
4662 | return selinux_nlmsg_perm(sk, skb); | |
4663 | } | |
4664 | ||
4665 | static int selinux_netlink_recv(struct sk_buff *skb, int capability) | |
4666 | { | |
4667 | int err; | |
4668 | struct common_audit_data ad; | |
4669 | ||
4670 | err = cap_netlink_recv(skb, capability); | |
4671 | if (err) | |
4672 | return err; | |
4673 | ||
4674 | COMMON_AUDIT_DATA_INIT(&ad, CAP); | |
4675 | ad.u.cap = capability; | |
4676 | ||
4677 | return avc_has_perm(NETLINK_CB(skb).sid, NETLINK_CB(skb).sid, | |
4678 | SECCLASS_CAPABILITY, CAP_TO_MASK(capability), &ad); | |
4679 | } | |
4680 | ||
4681 | static int ipc_alloc_security(struct task_struct *task, | |
4682 | struct kern_ipc_perm *perm, | |
4683 | u16 sclass) | |
4684 | { | |
4685 | struct ipc_security_struct *isec; | |
4686 | u32 sid; | |
4687 | ||
4688 | isec = kzalloc(sizeof(struct ipc_security_struct), GFP_KERNEL); | |
4689 | if (!isec) | |
4690 | return -ENOMEM; | |
4691 | ||
4692 | sid = task_sid(task); | |
4693 | isec->sclass = sclass; | |
4694 | isec->sid = sid; | |
4695 | perm->security = isec; | |
4696 | ||
4697 | return 0; | |
4698 | } | |
4699 | ||
4700 | static void ipc_free_security(struct kern_ipc_perm *perm) | |
4701 | { | |
4702 | struct ipc_security_struct *isec = perm->security; | |
4703 | perm->security = NULL; | |
4704 | kfree(isec); | |
4705 | } | |
4706 | ||
4707 | static int msg_msg_alloc_security(struct msg_msg *msg) | |
4708 | { | |
4709 | struct msg_security_struct *msec; | |
4710 | ||
4711 | msec = kzalloc(sizeof(struct msg_security_struct), GFP_KERNEL); | |
4712 | if (!msec) | |
4713 | return -ENOMEM; | |
4714 | ||
4715 | msec->sid = SECINITSID_UNLABELED; | |
4716 | msg->security = msec; | |
4717 | ||
4718 | return 0; | |
4719 | } | |
4720 | ||
4721 | static void msg_msg_free_security(struct msg_msg *msg) | |
4722 | { | |
4723 | struct msg_security_struct *msec = msg->security; | |
4724 | ||
4725 | msg->security = NULL; | |
4726 | kfree(msec); | |
4727 | } | |
4728 | ||
4729 | static int ipc_has_perm(struct kern_ipc_perm *ipc_perms, | |
4730 | u32 perms) | |
4731 | { | |
4732 | struct ipc_security_struct *isec; | |
4733 | struct common_audit_data ad; | |
4734 | u32 sid = current_sid(); | |
4735 | ||
4736 | isec = ipc_perms->security; | |
4737 | ||
4738 | COMMON_AUDIT_DATA_INIT(&ad, IPC); | |
4739 | ad.u.ipc_id = ipc_perms->key; | |
4740 | ||
4741 | return avc_has_perm(sid, isec->sid, isec->sclass, perms, &ad); | |
4742 | } | |
4743 | ||
4744 | static int selinux_msg_msg_alloc_security(struct msg_msg *msg) | |
4745 | { | |
4746 | return msg_msg_alloc_security(msg); | |
4747 | } | |
4748 | ||
4749 | static void selinux_msg_msg_free_security(struct msg_msg *msg) | |
4750 | { | |
4751 | msg_msg_free_security(msg); | |
4752 | } | |
4753 | ||
4754 | /* message queue security operations */ | |
4755 | static int selinux_msg_queue_alloc_security(struct msg_queue *msq) | |
4756 | { | |
4757 | struct ipc_security_struct *isec; | |
4758 | struct common_audit_data ad; | |
4759 | u32 sid = current_sid(); | |
4760 | int rc; | |
4761 | ||
4762 | rc = ipc_alloc_security(current, &msq->q_perm, SECCLASS_MSGQ); | |
4763 | if (rc) | |
4764 | return rc; | |
4765 | ||
4766 | isec = msq->q_perm.security; | |
4767 | ||
4768 | COMMON_AUDIT_DATA_INIT(&ad, IPC); | |
4769 | ad.u.ipc_id = msq->q_perm.key; | |
4770 | ||
4771 | rc = avc_has_perm(sid, isec->sid, SECCLASS_MSGQ, | |
4772 | MSGQ__CREATE, &ad); | |
4773 | if (rc) { | |
4774 | ipc_free_security(&msq->q_perm); | |
4775 | return rc; | |
4776 | } | |
4777 | return 0; | |
4778 | } | |
4779 | ||
4780 | static void selinux_msg_queue_free_security(struct msg_queue *msq) | |
4781 | { | |
4782 | ipc_free_security(&msq->q_perm); | |
4783 | } | |
4784 | ||
4785 | static int selinux_msg_queue_associate(struct msg_queue *msq, int msqflg) | |
4786 | { | |
4787 | struct ipc_security_struct *isec; | |
4788 | struct common_audit_data ad; | |
4789 | u32 sid = current_sid(); | |
4790 | ||
4791 | isec = msq->q_perm.security; | |
4792 | ||
4793 | COMMON_AUDIT_DATA_INIT(&ad, IPC); | |
4794 | ad.u.ipc_id = msq->q_perm.key; | |
4795 | ||
4796 | return avc_has_perm(sid, isec->sid, SECCLASS_MSGQ, | |
4797 | MSGQ__ASSOCIATE, &ad); | |
4798 | } | |
4799 | ||
4800 | static int selinux_msg_queue_msgctl(struct msg_queue *msq, int cmd) | |
4801 | { | |
4802 | int err; | |
4803 | int perms; | |
4804 | ||
4805 | switch (cmd) { | |
4806 | case IPC_INFO: | |
4807 | case MSG_INFO: | |
4808 | /* No specific object, just general system-wide information. */ | |
4809 | return task_has_system(current, SYSTEM__IPC_INFO); | |
4810 | case IPC_STAT: | |
4811 | case MSG_STAT: | |
4812 | perms = MSGQ__GETATTR | MSGQ__ASSOCIATE; | |
4813 | break; | |
4814 | case IPC_SET: | |
4815 | perms = MSGQ__SETATTR; | |
4816 | break; | |
4817 | case IPC_RMID: | |
4818 | perms = MSGQ__DESTROY; | |
4819 | break; | |
4820 | default: | |
4821 | return 0; | |
4822 | } | |
4823 | ||
4824 | err = ipc_has_perm(&msq->q_perm, perms); | |
4825 | return err; | |
4826 | } | |
4827 | ||
4828 | static int selinux_msg_queue_msgsnd(struct msg_queue *msq, struct msg_msg *msg, int msqflg) | |
4829 | { | |
4830 | struct ipc_security_struct *isec; | |
4831 | struct msg_security_struct *msec; | |
4832 | struct common_audit_data ad; | |
4833 | u32 sid = current_sid(); | |
4834 | int rc; | |
4835 | ||
4836 | isec = msq->q_perm.security; | |
4837 | msec = msg->security; | |
4838 | ||
4839 | /* | |
4840 | * First time through, need to assign label to the message | |
4841 | */ | |
4842 | if (msec->sid == SECINITSID_UNLABELED) { | |
4843 | /* | |
4844 | * Compute new sid based on current process and | |
4845 | * message queue this message will be stored in | |
4846 | */ | |
4847 | rc = security_transition_sid(sid, isec->sid, SECCLASS_MSG, | |
4848 | &msec->sid); | |
4849 | if (rc) | |
4850 | return rc; | |
4851 | } | |
4852 | ||
4853 | COMMON_AUDIT_DATA_INIT(&ad, IPC); | |
4854 | ad.u.ipc_id = msq->q_perm.key; | |
4855 | ||
4856 | /* Can this process write to the queue? */ | |
4857 | rc = avc_has_perm(sid, isec->sid, SECCLASS_MSGQ, | |
4858 | MSGQ__WRITE, &ad); | |
4859 | if (!rc) | |
4860 | /* Can this process send the message */ | |
4861 | rc = avc_has_perm(sid, msec->sid, SECCLASS_MSG, | |
4862 | MSG__SEND, &ad); | |
4863 | if (!rc) | |
4864 | /* Can the message be put in the queue? */ | |
4865 | rc = avc_has_perm(msec->sid, isec->sid, SECCLASS_MSGQ, | |
4866 | MSGQ__ENQUEUE, &ad); | |
4867 | ||
4868 | return rc; | |
4869 | } | |
4870 | ||
4871 | static int selinux_msg_queue_msgrcv(struct msg_queue *msq, struct msg_msg *msg, | |
4872 | struct task_struct *target, | |
4873 | long type, int mode) | |
4874 | { | |
4875 | struct ipc_security_struct *isec; | |
4876 | struct msg_security_struct *msec; | |
4877 | struct common_audit_data ad; | |
4878 | u32 sid = task_sid(target); | |
4879 | int rc; | |
4880 | ||
4881 | isec = msq->q_perm.security; | |
4882 | msec = msg->security; | |
4883 | ||
4884 | COMMON_AUDIT_DATA_INIT(&ad, IPC); | |
4885 | ad.u.ipc_id = msq->q_perm.key; | |
4886 | ||
4887 | rc = avc_has_perm(sid, isec->sid, | |
4888 | SECCLASS_MSGQ, MSGQ__READ, &ad); | |
4889 | if (!rc) | |
4890 | rc = avc_has_perm(sid, msec->sid, | |
4891 | SECCLASS_MSG, MSG__RECEIVE, &ad); | |
4892 | return rc; | |
4893 | } | |
4894 | ||
4895 | /* Shared Memory security operations */ | |
4896 | static int selinux_shm_alloc_security(struct shmid_kernel *shp) | |
4897 | { | |
4898 | struct ipc_security_struct *isec; | |
4899 | struct common_audit_data ad; | |
4900 | u32 sid = current_sid(); | |
4901 | int rc; | |
4902 | ||
4903 | rc = ipc_alloc_security(current, &shp->shm_perm, SECCLASS_SHM); | |
4904 | if (rc) | |
4905 | return rc; | |
4906 | ||
4907 | isec = shp->shm_perm.security; | |
4908 | ||
4909 | COMMON_AUDIT_DATA_INIT(&ad, IPC); | |
4910 | ad.u.ipc_id = shp->shm_perm.key; | |
4911 | ||
4912 | rc = avc_has_perm(sid, isec->sid, SECCLASS_SHM, | |
4913 | SHM__CREATE, &ad); | |
4914 | if (rc) { | |
4915 | ipc_free_security(&shp->shm_perm); | |
4916 | return rc; | |
4917 | } | |
4918 | return 0; | |
4919 | } | |
4920 | ||
4921 | static void selinux_shm_free_security(struct shmid_kernel *shp) | |
4922 | { | |
4923 | ipc_free_security(&shp->shm_perm); | |
4924 | } | |
4925 | ||
4926 | static int selinux_shm_associate(struct shmid_kernel *shp, int shmflg) | |
4927 | { | |
4928 | struct ipc_security_struct *isec; | |
4929 | struct common_audit_data ad; | |
4930 | u32 sid = current_sid(); | |
4931 | ||
4932 | isec = shp->shm_perm.security; | |
4933 | ||
4934 | COMMON_AUDIT_DATA_INIT(&ad, IPC); | |
4935 | ad.u.ipc_id = shp->shm_perm.key; | |
4936 | ||
4937 | return avc_has_perm(sid, isec->sid, SECCLASS_SHM, | |
4938 | SHM__ASSOCIATE, &ad); | |
4939 | } | |
4940 | ||
4941 | /* Note, at this point, shp is locked down */ | |
4942 | static int selinux_shm_shmctl(struct shmid_kernel *shp, int cmd) | |
4943 | { | |
4944 | int perms; | |
4945 | int err; | |
4946 | ||
4947 | switch (cmd) { | |
4948 | case IPC_INFO: | |
4949 | case SHM_INFO: | |
4950 | /* No specific object, just general system-wide information. */ | |
4951 | return task_has_system(current, SYSTEM__IPC_INFO); | |
4952 | case IPC_STAT: | |
4953 | case SHM_STAT: | |
4954 | perms = SHM__GETATTR | SHM__ASSOCIATE; | |
4955 | break; | |
4956 | case IPC_SET: | |
4957 | perms = SHM__SETATTR; | |
4958 | break; | |
4959 | case SHM_LOCK: | |
4960 | case SHM_UNLOCK: | |
4961 | perms = SHM__LOCK; | |
4962 | break; | |
4963 | case IPC_RMID: | |
4964 | perms = SHM__DESTROY; | |
4965 | break; | |
4966 | default: | |
4967 | return 0; | |
4968 | } | |
4969 | ||
4970 | err = ipc_has_perm(&shp->shm_perm, perms); | |
4971 | return err; | |
4972 | } | |
4973 | ||
4974 | static int selinux_shm_shmat(struct shmid_kernel *shp, | |
4975 | char __user *shmaddr, int shmflg) | |
4976 | { | |
4977 | u32 perms; | |
4978 | ||
4979 | if (shmflg & SHM_RDONLY) | |
4980 | perms = SHM__READ; | |
4981 | else | |
4982 | perms = SHM__READ | SHM__WRITE; | |
4983 | ||
4984 | return ipc_has_perm(&shp->shm_perm, perms); | |
4985 | } | |
4986 | ||
4987 | /* Semaphore security operations */ | |
4988 | static int selinux_sem_alloc_security(struct sem_array *sma) | |
4989 | { | |
4990 | struct ipc_security_struct *isec; | |
4991 | struct common_audit_data ad; | |
4992 | u32 sid = current_sid(); | |
4993 | int rc; | |
4994 | ||
4995 | rc = ipc_alloc_security(current, &sma->sem_perm, SECCLASS_SEM); | |
4996 | if (rc) | |
4997 | return rc; | |
4998 | ||
4999 | isec = sma->sem_perm.security; | |
5000 | ||
5001 | COMMON_AUDIT_DATA_INIT(&ad, IPC); | |
5002 | ad.u.ipc_id = sma->sem_perm.key; | |
5003 | ||
5004 | rc = avc_has_perm(sid, isec->sid, SECCLASS_SEM, | |
5005 | SEM__CREATE, &ad); | |
5006 | if (rc) { | |
5007 | ipc_free_security(&sma->sem_perm); | |
5008 | return rc; | |
5009 | } | |
5010 | return 0; | |
5011 | } | |
5012 | ||
5013 | static void selinux_sem_free_security(struct sem_array *sma) | |
5014 | { | |
5015 | ipc_free_security(&sma->sem_perm); | |
5016 | } | |
5017 | ||
5018 | static int selinux_sem_associate(struct sem_array *sma, int semflg) | |
5019 | { | |
5020 | struct ipc_security_struct *isec; | |
5021 | struct common_audit_data ad; | |
5022 | u32 sid = current_sid(); | |
5023 | ||
5024 | isec = sma->sem_perm.security; | |
5025 | ||
5026 | COMMON_AUDIT_DATA_INIT(&ad, IPC); | |
5027 | ad.u.ipc_id = sma->sem_perm.key; | |
5028 | ||
5029 | return avc_has_perm(sid, isec->sid, SECCLASS_SEM, | |
5030 | SEM__ASSOCIATE, &ad); | |
5031 | } | |
5032 | ||
5033 | /* Note, at this point, sma is locked down */ | |
5034 | static int selinux_sem_semctl(struct sem_array *sma, int cmd) | |
5035 | { | |
5036 | int err; | |
5037 | u32 perms; | |
5038 | ||
5039 | switch (cmd) { | |
5040 | case IPC_INFO: | |
5041 | case SEM_INFO: | |
5042 | /* No specific object, just general system-wide information. */ | |
5043 | return task_has_system(current, SYSTEM__IPC_INFO); | |
5044 | case GETPID: | |
5045 | case GETNCNT: | |
5046 | case GETZCNT: | |
5047 | perms = SEM__GETATTR; | |
5048 | break; | |
5049 | case GETVAL: | |
5050 | case GETALL: | |
5051 | perms = SEM__READ; | |
5052 | break; | |
5053 | case SETVAL: | |
5054 | case SETALL: | |
5055 | perms = SEM__WRITE; | |
5056 | break; | |
5057 | case IPC_RMID: | |
5058 | perms = SEM__DESTROY; | |
5059 | break; | |
5060 | case IPC_SET: | |
5061 | perms = SEM__SETATTR; | |
5062 | break; | |
5063 | case IPC_STAT: | |
5064 | case SEM_STAT: | |
5065 | perms = SEM__GETATTR | SEM__ASSOCIATE; | |
5066 | break; | |
5067 | default: | |
5068 | return 0; | |
5069 | } | |
5070 | ||
5071 | err = ipc_has_perm(&sma->sem_perm, perms); | |
5072 | return err; | |
5073 | } | |
5074 | ||
5075 | static int selinux_sem_semop(struct sem_array *sma, | |
5076 | struct sembuf *sops, unsigned nsops, int alter) | |
5077 | { | |
5078 | u32 perms; | |
5079 | ||
5080 | if (alter) | |
5081 | perms = SEM__READ | SEM__WRITE; | |
5082 | else | |
5083 | perms = SEM__READ; | |
5084 | ||
5085 | return ipc_has_perm(&sma->sem_perm, perms); | |
5086 | } | |
5087 | ||
5088 | static int selinux_ipc_permission(struct kern_ipc_perm *ipcp, short flag) | |
5089 | { | |
5090 | u32 av = 0; | |
5091 | ||
5092 | av = 0; | |
5093 | if (flag & S_IRUGO) | |
5094 | av |= IPC__UNIX_READ; | |
5095 | if (flag & S_IWUGO) | |
5096 | av |= IPC__UNIX_WRITE; | |
5097 | ||
5098 | if (av == 0) | |
5099 | return 0; | |
5100 | ||
5101 | return ipc_has_perm(ipcp, av); | |
5102 | } | |
5103 | ||
5104 | static void selinux_ipc_getsecid(struct kern_ipc_perm *ipcp, u32 *secid) | |
5105 | { | |
5106 | struct ipc_security_struct *isec = ipcp->security; | |
5107 | *secid = isec->sid; | |
5108 | } | |
5109 | ||
5110 | static void selinux_d_instantiate(struct dentry *dentry, struct inode *inode) | |
5111 | { | |
5112 | if (inode) | |
5113 | inode_doinit_with_dentry(inode, dentry); | |
5114 | } | |
5115 | ||
5116 | static int selinux_getprocattr(struct task_struct *p, | |
5117 | char *name, char **value) | |
5118 | { | |
5119 | const struct task_security_struct *__tsec; | |
5120 | u32 sid; | |
5121 | int error; | |
5122 | unsigned len; | |
5123 | ||
5124 | if (current != p) { | |
5125 | error = current_has_perm(p, PROCESS__GETATTR); | |
5126 | if (error) | |
5127 | return error; | |
5128 | } | |
5129 | ||
5130 | rcu_read_lock(); | |
5131 | __tsec = __task_cred(p)->security; | |
5132 | ||
5133 | if (!strcmp(name, "current")) | |
5134 | sid = __tsec->sid; | |
5135 | else if (!strcmp(name, "prev")) | |
5136 | sid = __tsec->osid; | |
5137 | else if (!strcmp(name, "exec")) | |
5138 | sid = __tsec->exec_sid; | |
5139 | else if (!strcmp(name, "fscreate")) | |
5140 | sid = __tsec->create_sid; | |
5141 | else if (!strcmp(name, "keycreate")) | |
5142 | sid = __tsec->keycreate_sid; | |
5143 | else if (!strcmp(name, "sockcreate")) | |
5144 | sid = __tsec->sockcreate_sid; | |
5145 | else | |
5146 | goto invalid; | |
5147 | rcu_read_unlock(); | |
5148 | ||
5149 | if (!sid) | |
5150 | return 0; | |
5151 | ||
5152 | error = security_sid_to_context(sid, value, &len); | |
5153 | if (error) | |
5154 | return error; | |
5155 | return len; | |
5156 | ||
5157 | invalid: | |
5158 | rcu_read_unlock(); | |
5159 | return -EINVAL; | |
5160 | } | |
5161 | ||
5162 | static int selinux_setprocattr(struct task_struct *p, | |
5163 | char *name, void *value, size_t size) | |
5164 | { | |
5165 | struct task_security_struct *tsec; | |
5166 | struct task_struct *tracer; | |
5167 | struct cred *new; | |
5168 | u32 sid = 0, ptsid; | |
5169 | int error; | |
5170 | char *str = value; | |
5171 | ||
5172 | if (current != p) { | |
5173 | /* SELinux only allows a process to change its own | |
5174 | security attributes. */ | |
5175 | return -EACCES; | |
5176 | } | |
5177 | ||
5178 | /* | |
5179 | * Basic control over ability to set these attributes at all. | |
5180 | * current == p, but we'll pass them separately in case the | |
5181 | * above restriction is ever removed. | |
5182 | */ | |
5183 | if (!strcmp(name, "exec")) | |
5184 | error = current_has_perm(p, PROCESS__SETEXEC); | |
5185 | else if (!strcmp(name, "fscreate")) | |
5186 | error = current_has_perm(p, PROCESS__SETFSCREATE); | |
5187 | else if (!strcmp(name, "keycreate")) | |
5188 | error = current_has_perm(p, PROCESS__SETKEYCREATE); | |
5189 | else if (!strcmp(name, "sockcreate")) | |
5190 | error = current_has_perm(p, PROCESS__SETSOCKCREATE); | |
5191 | else if (!strcmp(name, "current")) | |
5192 | error = current_has_perm(p, PROCESS__SETCURRENT); | |
5193 | else | |
5194 | error = -EINVAL; | |
5195 | if (error) | |
5196 | return error; | |
5197 | ||
5198 | /* Obtain a SID for the context, if one was specified. */ | |
5199 | if (size && str[1] && str[1] != '\n') { | |
5200 | if (str[size-1] == '\n') { | |
5201 | str[size-1] = 0; | |
5202 | size--; | |
5203 | } | |
5204 | error = security_context_to_sid(value, size, &sid); | |
5205 | if (error == -EINVAL && !strcmp(name, "fscreate")) { | |
5206 | if (!capable(CAP_MAC_ADMIN)) | |
5207 | return error; | |
5208 | error = security_context_to_sid_force(value, size, | |
5209 | &sid); | |
5210 | } | |
5211 | if (error) | |
5212 | return error; | |
5213 | } | |
5214 | ||
5215 | new = prepare_creds(); | |
5216 | if (!new) | |
5217 | return -ENOMEM; | |
5218 | ||
5219 | /* Permission checking based on the specified context is | |
5220 | performed during the actual operation (execve, | |
5221 | open/mkdir/...), when we know the full context of the | |
5222 | operation. See selinux_bprm_set_creds for the execve | |
5223 | checks and may_create for the file creation checks. The | |
5224 | operation will then fail if the context is not permitted. */ | |
5225 | tsec = new->security; | |
5226 | if (!strcmp(name, "exec")) { | |
5227 | tsec->exec_sid = sid; | |
5228 | } else if (!strcmp(name, "fscreate")) { | |
5229 | tsec->create_sid = sid; | |
5230 | } else if (!strcmp(name, "keycreate")) { | |
5231 | error = may_create_key(sid, p); | |
5232 | if (error) | |
5233 | goto abort_change; | |
5234 | tsec->keycreate_sid = sid; | |
5235 | } else if (!strcmp(name, "sockcreate")) { | |
5236 | tsec->sockcreate_sid = sid; | |
5237 | } else if (!strcmp(name, "current")) { | |
5238 | error = -EINVAL; | |
5239 | if (sid == 0) | |
5240 | goto abort_change; | |
5241 | ||
5242 | /* Only allow single threaded processes to change context */ | |
5243 | error = -EPERM; | |
5244 | if (!current_is_single_threaded()) { | |
5245 | error = security_bounded_transition(tsec->sid, sid); | |
5246 | if (error) | |
5247 | goto abort_change; | |
5248 | } | |
5249 | ||
5250 | /* Check permissions for the transition. */ | |
5251 | error = avc_has_perm(tsec->sid, sid, SECCLASS_PROCESS, | |
5252 | PROCESS__DYNTRANSITION, NULL); | |
5253 | if (error) | |
5254 | goto abort_change; | |
5255 | ||
5256 | /* Check for ptracing, and update the task SID if ok. | |
5257 | Otherwise, leave SID unchanged and fail. */ | |
5258 | ptsid = 0; | |
5259 | task_lock(p); | |
5260 | tracer = tracehook_tracer_task(p); | |
5261 | if (tracer) | |
5262 | ptsid = task_sid(tracer); | |
5263 | task_unlock(p); | |
5264 | ||
5265 | if (tracer) { | |
5266 | error = avc_has_perm(ptsid, sid, SECCLASS_PROCESS, | |
5267 | PROCESS__PTRACE, NULL); | |
5268 | if (error) | |
5269 | goto abort_change; | |
5270 | } | |
5271 | ||
5272 | tsec->sid = sid; | |
5273 | } else { | |
5274 | error = -EINVAL; | |
5275 | goto abort_change; | |
5276 | } | |
5277 | ||
5278 | commit_creds(new); | |
5279 | return size; | |
5280 | ||
5281 | abort_change: | |
5282 | abort_creds(new); | |
5283 | return error; | |
5284 | } | |
5285 | ||
5286 | static int selinux_secid_to_secctx(u32 secid, char **secdata, u32 *seclen) | |
5287 | { | |
5288 | return security_sid_to_context(secid, secdata, seclen); | |
5289 | } | |
5290 | ||
5291 | static int selinux_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid) | |
5292 | { | |
5293 | return security_context_to_sid(secdata, seclen, secid); | |
5294 | } | |
5295 | ||
5296 | static void selinux_release_secctx(char *secdata, u32 seclen) | |
5297 | { | |
5298 | kfree(secdata); | |
5299 | } | |
5300 | ||
5301 | /* | |
5302 | * called with inode->i_mutex locked | |
5303 | */ | |
5304 | static int selinux_inode_notifysecctx(struct inode *inode, void *ctx, u32 ctxlen) | |
5305 | { | |
5306 | return selinux_inode_setsecurity(inode, XATTR_SELINUX_SUFFIX, ctx, ctxlen, 0); | |
5307 | } | |
5308 | ||
5309 | /* | |
5310 | * called with inode->i_mutex locked | |
5311 | */ | |
5312 | static int selinux_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen) | |
5313 | { | |
5314 | return __vfs_setxattr_noperm(dentry, XATTR_NAME_SELINUX, ctx, ctxlen, 0); | |
5315 | } | |
5316 | ||
5317 | static int selinux_inode_getsecctx(struct inode *inode, void **ctx, u32 *ctxlen) | |
5318 | { | |
5319 | int len = 0; | |
5320 | len = selinux_inode_getsecurity(inode, XATTR_SELINUX_SUFFIX, | |
5321 | ctx, true); | |
5322 | if (len < 0) | |
5323 | return len; | |
5324 | *ctxlen = len; | |
5325 | return 0; | |
5326 | } | |
5327 | #ifdef CONFIG_KEYS | |
5328 | ||
5329 | static int selinux_key_alloc(struct key *k, const struct cred *cred, | |
5330 | unsigned long flags) | |
5331 | { | |
5332 | const struct task_security_struct *tsec; | |
5333 | struct key_security_struct *ksec; | |
5334 | ||
5335 | ksec = kzalloc(sizeof(struct key_security_struct), GFP_KERNEL); | |
5336 | if (!ksec) | |
5337 | return -ENOMEM; | |
5338 | ||
5339 | tsec = cred->security; | |
5340 | if (tsec->keycreate_sid) | |
5341 | ksec->sid = tsec->keycreate_sid; | |
5342 | else | |
5343 | ksec->sid = tsec->sid; | |
5344 | ||
5345 | k->security = ksec; | |
5346 | return 0; | |
5347 | } | |
5348 | ||
5349 | static void selinux_key_free(struct key *k) | |
5350 | { | |
5351 | struct key_security_struct *ksec = k->security; | |
5352 | ||
5353 | k->security = NULL; | |
5354 | kfree(ksec); | |
5355 | } | |
5356 | ||
5357 | static int selinux_key_permission(key_ref_t key_ref, | |
5358 | const struct cred *cred, | |
5359 | key_perm_t perm) | |
5360 | { | |
5361 | struct key *key; | |
5362 | struct key_security_struct *ksec; | |
5363 | u32 sid; | |
5364 | ||
5365 | /* if no specific permissions are requested, we skip the | |
5366 | permission check. No serious, additional covert channels | |
5367 | appear to be created. */ | |
5368 | if (perm == 0) | |
5369 | return 0; | |
5370 | ||
5371 | sid = cred_sid(cred); | |
5372 | ||
5373 | key = key_ref_to_ptr(key_ref); | |
5374 | ksec = key->security; | |
5375 | ||
5376 | return avc_has_perm(sid, ksec->sid, SECCLASS_KEY, perm, NULL); | |
5377 | } | |
5378 | ||
5379 | static int selinux_key_getsecurity(struct key *key, char **_buffer) | |
5380 | { | |
5381 | struct key_security_struct *ksec = key->security; | |
5382 | char *context = NULL; | |
5383 | unsigned len; | |
5384 | int rc; | |
5385 | ||
5386 | rc = security_sid_to_context(ksec->sid, &context, &len); | |
5387 | if (!rc) | |
5388 | rc = len; | |
5389 | *_buffer = context; | |
5390 | return rc; | |
5391 | } | |
5392 | ||
5393 | #endif | |
5394 | ||
5395 | static struct security_operations selinux_ops = { | |
5396 | .name = "selinux", | |
5397 | ||
5398 | .ptrace_access_check = selinux_ptrace_access_check, | |
5399 | .ptrace_traceme = selinux_ptrace_traceme, | |
5400 | .capget = selinux_capget, | |
5401 | .capset = selinux_capset, | |
5402 | .sysctl = selinux_sysctl, | |
5403 | .capable = selinux_capable, | |
5404 | .quotactl = selinux_quotactl, | |
5405 | .quota_on = selinux_quota_on, | |
5406 | .syslog = selinux_syslog, | |
5407 | .vm_enough_memory = selinux_vm_enough_memory, | |
5408 | ||
5409 | .netlink_send = selinux_netlink_send, | |
5410 | .netlink_recv = selinux_netlink_recv, | |
5411 | ||
5412 | .bprm_set_creds = selinux_bprm_set_creds, | |
5413 | .bprm_committing_creds = selinux_bprm_committing_creds, | |
5414 | .bprm_committed_creds = selinux_bprm_committed_creds, | |
5415 | .bprm_secureexec = selinux_bprm_secureexec, | |
5416 | ||
5417 | .sb_alloc_security = selinux_sb_alloc_security, | |
5418 | .sb_free_security = selinux_sb_free_security, | |
5419 | .sb_copy_data = selinux_sb_copy_data, | |
5420 | .sb_kern_mount = selinux_sb_kern_mount, | |
5421 | .sb_show_options = selinux_sb_show_options, | |
5422 | .sb_statfs = selinux_sb_statfs, | |
5423 | .sb_mount = selinux_mount, | |
5424 | .sb_umount = selinux_umount, | |
5425 | .sb_set_mnt_opts = selinux_set_mnt_opts, | |
5426 | .sb_clone_mnt_opts = selinux_sb_clone_mnt_opts, | |
5427 | .sb_parse_opts_str = selinux_parse_opts_str, | |
5428 | ||
5429 | ||
5430 | .inode_alloc_security = selinux_inode_alloc_security, | |
5431 | .inode_free_security = selinux_inode_free_security, | |
5432 | .inode_init_security = selinux_inode_init_security, | |
5433 | .inode_create = selinux_inode_create, | |
5434 | .inode_link = selinux_inode_link, | |
5435 | .inode_unlink = selinux_inode_unlink, | |
5436 | .inode_symlink = selinux_inode_symlink, | |
5437 | .inode_mkdir = selinux_inode_mkdir, | |
5438 | .inode_rmdir = selinux_inode_rmdir, | |
5439 | .inode_mknod = selinux_inode_mknod, | |
5440 | .inode_rename = selinux_inode_rename, | |
5441 | .inode_readlink = selinux_inode_readlink, | |
5442 | .inode_follow_link = selinux_inode_follow_link, | |
5443 | .inode_permission = selinux_inode_permission, | |
5444 | .inode_setattr = selinux_inode_setattr, | |
5445 | .inode_getattr = selinux_inode_getattr, | |
5446 | .inode_setxattr = selinux_inode_setxattr, | |
5447 | .inode_post_setxattr = selinux_inode_post_setxattr, | |
5448 | .inode_getxattr = selinux_inode_getxattr, | |
5449 | .inode_listxattr = selinux_inode_listxattr, | |
5450 | .inode_removexattr = selinux_inode_removexattr, | |
5451 | .inode_getsecurity = selinux_inode_getsecurity, | |
5452 | .inode_setsecurity = selinux_inode_setsecurity, | |
5453 | .inode_listsecurity = selinux_inode_listsecurity, | |
5454 | .inode_getsecid = selinux_inode_getsecid, | |
5455 | ||
5456 | .file_permission = selinux_file_permission, | |
5457 | .file_alloc_security = selinux_file_alloc_security, | |
5458 | .file_free_security = selinux_file_free_security, | |
5459 | .file_ioctl = selinux_file_ioctl, | |
5460 | .file_mmap = selinux_file_mmap, | |
5461 | .file_mprotect = selinux_file_mprotect, | |
5462 | .file_lock = selinux_file_lock, | |
5463 | .file_fcntl = selinux_file_fcntl, | |
5464 | .file_set_fowner = selinux_file_set_fowner, | |
5465 | .file_send_sigiotask = selinux_file_send_sigiotask, | |
5466 | .file_receive = selinux_file_receive, | |
5467 | ||
5468 | .dentry_open = selinux_dentry_open, | |
5469 | ||
5470 | .task_create = selinux_task_create, | |
5471 | .cred_alloc_blank = selinux_cred_alloc_blank, | |
5472 | .cred_free = selinux_cred_free, | |
5473 | .cred_prepare = selinux_cred_prepare, | |
5474 | .cred_transfer = selinux_cred_transfer, | |
5475 | .kernel_act_as = selinux_kernel_act_as, | |
5476 | .kernel_create_files_as = selinux_kernel_create_files_as, | |
5477 | .kernel_module_request = selinux_kernel_module_request, | |
5478 | .task_setpgid = selinux_task_setpgid, | |
5479 | .task_getpgid = selinux_task_getpgid, | |
5480 | .task_getsid = selinux_task_getsid, | |
5481 | .task_getsecid = selinux_task_getsecid, | |
5482 | .task_setnice = selinux_task_setnice, | |
5483 | .task_setioprio = selinux_task_setioprio, | |
5484 | .task_getioprio = selinux_task_getioprio, | |
5485 | .task_setrlimit = selinux_task_setrlimit, | |
5486 | .task_setscheduler = selinux_task_setscheduler, | |
5487 | .task_getscheduler = selinux_task_getscheduler, | |
5488 | .task_movememory = selinux_task_movememory, | |
5489 | .task_kill = selinux_task_kill, | |
5490 | .task_wait = selinux_task_wait, | |
5491 | .task_to_inode = selinux_task_to_inode, | |
5492 | ||
5493 | .ipc_permission = selinux_ipc_permission, | |
5494 | .ipc_getsecid = selinux_ipc_getsecid, | |
5495 | ||
5496 | .msg_msg_alloc_security = selinux_msg_msg_alloc_security, | |
5497 | .msg_msg_free_security = selinux_msg_msg_free_security, | |
5498 | ||
5499 | .msg_queue_alloc_security = selinux_msg_queue_alloc_security, | |
5500 | .msg_queue_free_security = selinux_msg_queue_free_security, | |
5501 | .msg_queue_associate = selinux_msg_queue_associate, | |
5502 | .msg_queue_msgctl = selinux_msg_queue_msgctl, | |
5503 | .msg_queue_msgsnd = selinux_msg_queue_msgsnd, | |
5504 | .msg_queue_msgrcv = selinux_msg_queue_msgrcv, | |
5505 | ||
5506 | .shm_alloc_security = selinux_shm_alloc_security, | |
5507 | .shm_free_security = selinux_shm_free_security, | |
5508 | .shm_associate = selinux_shm_associate, | |
5509 | .shm_shmctl = selinux_shm_shmctl, | |
5510 | .shm_shmat = selinux_shm_shmat, | |
5511 | ||
5512 | .sem_alloc_security = selinux_sem_alloc_security, | |
5513 | .sem_free_security = selinux_sem_free_security, | |
5514 | .sem_associate = selinux_sem_associate, | |
5515 | .sem_semctl = selinux_sem_semctl, | |
5516 | .sem_semop = selinux_sem_semop, | |
5517 | ||
5518 | .d_instantiate = selinux_d_instantiate, | |
5519 | ||
5520 | .getprocattr = selinux_getprocattr, | |
5521 | .setprocattr = selinux_setprocattr, | |
5522 | ||
5523 | .secid_to_secctx = selinux_secid_to_secctx, | |
5524 | .secctx_to_secid = selinux_secctx_to_secid, | |
5525 | .release_secctx = selinux_release_secctx, | |
5526 | .inode_notifysecctx = selinux_inode_notifysecctx, | |
5527 | .inode_setsecctx = selinux_inode_setsecctx, | |
5528 | .inode_getsecctx = selinux_inode_getsecctx, | |
5529 | ||
5530 | .unix_stream_connect = selinux_socket_unix_stream_connect, | |
5531 | .unix_may_send = selinux_socket_unix_may_send, | |
5532 | ||
5533 | .socket_create = selinux_socket_create, | |
5534 | .socket_post_create = selinux_socket_post_create, | |
5535 | .socket_bind = selinux_socket_bind, | |
5536 | .socket_connect = selinux_socket_connect, | |
5537 | .socket_listen = selinux_socket_listen, | |
5538 | .socket_accept = selinux_socket_accept, | |
5539 | .socket_sendmsg = selinux_socket_sendmsg, | |
5540 | .socket_recvmsg = selinux_socket_recvmsg, | |
5541 | .socket_getsockname = selinux_socket_getsockname, | |
5542 | .socket_getpeername = selinux_socket_getpeername, | |
5543 | .socket_getsockopt = selinux_socket_getsockopt, | |
5544 | .socket_setsockopt = selinux_socket_setsockopt, | |
5545 | .socket_shutdown = selinux_socket_shutdown, | |
5546 | .socket_sock_rcv_skb = selinux_socket_sock_rcv_skb, | |
5547 | .socket_getpeersec_stream = selinux_socket_getpeersec_stream, | |
5548 | .socket_getpeersec_dgram = selinux_socket_getpeersec_dgram, | |
5549 | .sk_alloc_security = selinux_sk_alloc_security, | |
5550 | .sk_free_security = selinux_sk_free_security, | |
5551 | .sk_clone_security = selinux_sk_clone_security, | |
5552 | .sk_getsecid = selinux_sk_getsecid, | |
5553 | .sock_graft = selinux_sock_graft, | |
5554 | .inet_conn_request = selinux_inet_conn_request, | |
5555 | .inet_csk_clone = selinux_inet_csk_clone, | |
5556 | .inet_conn_established = selinux_inet_conn_established, | |
5557 | .secmark_relabel_packet = selinux_secmark_relabel_packet, | |
5558 | .secmark_refcount_inc = selinux_secmark_refcount_inc, | |
5559 | .secmark_refcount_dec = selinux_secmark_refcount_dec, | |
5560 | .req_classify_flow = selinux_req_classify_flow, | |
5561 | .tun_dev_create = selinux_tun_dev_create, | |
5562 | .tun_dev_post_create = selinux_tun_dev_post_create, | |
5563 | .tun_dev_attach = selinux_tun_dev_attach, | |
5564 | ||
5565 | #ifdef CONFIG_SECURITY_NETWORK_XFRM | |
5566 | .xfrm_policy_alloc_security = selinux_xfrm_policy_alloc, | |
5567 | .xfrm_policy_clone_security = selinux_xfrm_policy_clone, | |
5568 | .xfrm_policy_free_security = selinux_xfrm_policy_free, | |
5569 | .xfrm_policy_delete_security = selinux_xfrm_policy_delete, | |
5570 | .xfrm_state_alloc_security = selinux_xfrm_state_alloc, | |
5571 | .xfrm_state_free_security = selinux_xfrm_state_free, | |
5572 | .xfrm_state_delete_security = selinux_xfrm_state_delete, | |
5573 | .xfrm_policy_lookup = selinux_xfrm_policy_lookup, | |
5574 | .xfrm_state_pol_flow_match = selinux_xfrm_state_pol_flow_match, | |
5575 | .xfrm_decode_session = selinux_xfrm_decode_session, | |
5576 | #endif | |
5577 | ||
5578 | #ifdef CONFIG_KEYS | |
5579 | .key_alloc = selinux_key_alloc, | |
5580 | .key_free = selinux_key_free, | |
5581 | .key_permission = selinux_key_permission, | |
5582 | .key_getsecurity = selinux_key_getsecurity, | |
5583 | #endif | |
5584 | ||
5585 | #ifdef CONFIG_AUDIT | |
5586 | .audit_rule_init = selinux_audit_rule_init, | |
5587 | .audit_rule_known = selinux_audit_rule_known, | |
5588 | .audit_rule_match = selinux_audit_rule_match, | |
5589 | .audit_rule_free = selinux_audit_rule_free, | |
5590 | #endif | |
5591 | }; | |
5592 | ||
5593 | static __init int selinux_init(void) | |
5594 | { | |
5595 | if (!security_module_enable(&selinux_ops)) { | |
5596 | selinux_enabled = 0; | |
5597 | return 0; | |
5598 | } | |
5599 | ||
5600 | if (!selinux_enabled) { | |
5601 | printk(KERN_INFO "SELinux: Disabled at boot.\n"); | |
5602 | return 0; | |
5603 | } | |
5604 | ||
5605 | printk(KERN_INFO "SELinux: Initializing.\n"); | |
5606 | ||
5607 | /* Set the security state for the initial task. */ | |
5608 | cred_init_security(); | |
5609 | ||
5610 | default_noexec = !(VM_DATA_DEFAULT_FLAGS & VM_EXEC); | |
5611 | ||
5612 | sel_inode_cache = kmem_cache_create("selinux_inode_security", | |
5613 | sizeof(struct inode_security_struct), | |
5614 | 0, SLAB_PANIC, NULL); | |
5615 | avc_init(); | |
5616 | ||
5617 | if (register_security(&selinux_ops)) | |
5618 | panic("SELinux: Unable to register with kernel.\n"); | |
5619 | ||
5620 | if (selinux_enforcing) | |
5621 | printk(KERN_DEBUG "SELinux: Starting in enforcing mode\n"); | |
5622 | else | |
5623 | printk(KERN_DEBUG "SELinux: Starting in permissive mode\n"); | |
5624 | ||
5625 | return 0; | |
5626 | } | |
5627 | ||
5628 | static void delayed_superblock_init(struct super_block *sb, void *unused) | |
5629 | { | |
5630 | superblock_doinit(sb, NULL); | |
5631 | } | |
5632 | ||
5633 | void selinux_complete_init(void) | |
5634 | { | |
5635 | printk(KERN_DEBUG "SELinux: Completing initialization.\n"); | |
5636 | ||
5637 | /* Set up any superblocks initialized prior to the policy load. */ | |
5638 | printk(KERN_DEBUG "SELinux: Setting up existing superblocks.\n"); | |
5639 | iterate_supers(delayed_superblock_init, NULL); | |
5640 | } | |
5641 | ||
5642 | /* SELinux requires early initialization in order to label | |
5643 | all processes and objects when they are created. */ | |
5644 | security_initcall(selinux_init); | |
5645 | ||
5646 | #if defined(CONFIG_NETFILTER) | |
5647 | ||
5648 | static struct nf_hook_ops selinux_ipv4_ops[] = { | |
5649 | { | |
5650 | .hook = selinux_ipv4_postroute, | |
5651 | .owner = THIS_MODULE, | |
5652 | .pf = PF_INET, | |
5653 | .hooknum = NF_INET_POST_ROUTING, | |
5654 | .priority = NF_IP_PRI_SELINUX_LAST, | |
5655 | }, | |
5656 | { | |
5657 | .hook = selinux_ipv4_forward, | |
5658 | .owner = THIS_MODULE, | |
5659 | .pf = PF_INET, | |
5660 | .hooknum = NF_INET_FORWARD, | |
5661 | .priority = NF_IP_PRI_SELINUX_FIRST, | |
5662 | }, | |
5663 | { | |
5664 | .hook = selinux_ipv4_output, | |
5665 | .owner = THIS_MODULE, | |
5666 | .pf = PF_INET, | |
5667 | .hooknum = NF_INET_LOCAL_OUT, | |
5668 | .priority = NF_IP_PRI_SELINUX_FIRST, | |
5669 | } | |
5670 | }; | |
5671 | ||
5672 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
5673 | ||
5674 | static struct nf_hook_ops selinux_ipv6_ops[] = { | |
5675 | { | |
5676 | .hook = selinux_ipv6_postroute, | |
5677 | .owner = THIS_MODULE, | |
5678 | .pf = PF_INET6, | |
5679 | .hooknum = NF_INET_POST_ROUTING, | |
5680 | .priority = NF_IP6_PRI_SELINUX_LAST, | |
5681 | }, | |
5682 | { | |
5683 | .hook = selinux_ipv6_forward, | |
5684 | .owner = THIS_MODULE, | |
5685 | .pf = PF_INET6, | |
5686 | .hooknum = NF_INET_FORWARD, | |
5687 | .priority = NF_IP6_PRI_SELINUX_FIRST, | |
5688 | } | |
5689 | }; | |
5690 | ||
5691 | #endif /* IPV6 */ | |
5692 | ||
5693 | static int __init selinux_nf_ip_init(void) | |
5694 | { | |
5695 | int err = 0; | |
5696 | ||
5697 | if (!selinux_enabled) | |
5698 | goto out; | |
5699 | ||
5700 | printk(KERN_DEBUG "SELinux: Registering netfilter hooks\n"); | |
5701 | ||
5702 | err = nf_register_hooks(selinux_ipv4_ops, ARRAY_SIZE(selinux_ipv4_ops)); | |
5703 | if (err) | |
5704 | panic("SELinux: nf_register_hooks for IPv4: error %d\n", err); | |
5705 | ||
5706 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
5707 | err = nf_register_hooks(selinux_ipv6_ops, ARRAY_SIZE(selinux_ipv6_ops)); | |
5708 | if (err) | |
5709 | panic("SELinux: nf_register_hooks for IPv6: error %d\n", err); | |
5710 | #endif /* IPV6 */ | |
5711 | ||
5712 | out: | |
5713 | return err; | |
5714 | } | |
5715 | ||
5716 | __initcall(selinux_nf_ip_init); | |
5717 | ||
5718 | #ifdef CONFIG_SECURITY_SELINUX_DISABLE | |
5719 | static void selinux_nf_ip_exit(void) | |
5720 | { | |
5721 | printk(KERN_DEBUG "SELinux: Unregistering netfilter hooks\n"); | |
5722 | ||
5723 | nf_unregister_hooks(selinux_ipv4_ops, ARRAY_SIZE(selinux_ipv4_ops)); | |
5724 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) | |
5725 | nf_unregister_hooks(selinux_ipv6_ops, ARRAY_SIZE(selinux_ipv6_ops)); | |
5726 | #endif /* IPV6 */ | |
5727 | } | |
5728 | #endif | |
5729 | ||
5730 | #else /* CONFIG_NETFILTER */ | |
5731 | ||
5732 | #ifdef CONFIG_SECURITY_SELINUX_DISABLE | |
5733 | #define selinux_nf_ip_exit() | |
5734 | #endif | |
5735 | ||
5736 | #endif /* CONFIG_NETFILTER */ | |
5737 | ||
5738 | #ifdef CONFIG_SECURITY_SELINUX_DISABLE | |
5739 | static int selinux_disabled; | |
5740 | ||
5741 | int selinux_disable(void) | |
5742 | { | |
5743 | extern void exit_sel_fs(void); | |
5744 | ||
5745 | if (ss_initialized) { | |
5746 | /* Not permitted after initial policy load. */ | |
5747 | return -EINVAL; | |
5748 | } | |
5749 | ||
5750 | if (selinux_disabled) { | |
5751 | /* Only do this once. */ | |
5752 | return -EINVAL; | |
5753 | } | |
5754 | ||
5755 | printk(KERN_INFO "SELinux: Disabled at runtime.\n"); | |
5756 | ||
5757 | selinux_disabled = 1; | |
5758 | selinux_enabled = 0; | |
5759 | ||
5760 | reset_security_ops(); | |
5761 | ||
5762 | /* Try to destroy the avc node cache */ | |
5763 | avc_disable(); | |
5764 | ||
5765 | /* Unregister netfilter hooks. */ | |
5766 | selinux_nf_ip_exit(); | |
5767 | ||
5768 | /* Unregister selinuxfs. */ | |
5769 | exit_sel_fs(); | |
5770 | ||
5771 | return 0; | |
5772 | } | |
5773 | #endif |