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c88d4c7b JJ |
1 | /* |
2 | * AppArmor security module | |
3 | * | |
4 | * This file contains AppArmor policy manipulation functions | |
5 | * | |
6 | * Copyright (C) 1998-2008 Novell/SUSE | |
7 | * Copyright 2009-2010 Canonical Ltd. | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or | |
10 | * modify it under the terms of the GNU General Public License as | |
11 | * published by the Free Software Foundation, version 2 of the | |
12 | * License. | |
13 | * | |
14 | * | |
15 | * AppArmor policy is based around profiles, which contain the rules a | |
16 | * task is confined by. Every task in the system has a profile attached | |
17 | * to it determined either by matching "unconfined" tasks against the | |
18 | * visible set of profiles or by following a profiles attachment rules. | |
19 | * | |
20 | * Each profile exists in a profile namespace which is a container of | |
21 | * visible profiles. Each namespace contains a special "unconfined" profile, | |
22 | * which doesn't enforce any confinement on a task beyond DAC. | |
23 | * | |
24 | * Namespace and profile names can be written together in either | |
25 | * of two syntaxes. | |
26 | * :namespace:profile - used by kernel interfaces for easy detection | |
27 | * namespace://profile - used by policy | |
28 | * | |
29 | * Profile names can not start with : or @ or ^ and may not contain \0 | |
30 | * | |
31 | * Reserved profile names | |
32 | * unconfined - special automatically generated unconfined profile | |
33 | * inherit - special name to indicate profile inheritance | |
34 | * null-XXXX-YYYY - special automatically generated learning profiles | |
35 | * | |
36 | * Namespace names may not start with / or @ and may not contain \0 or : | |
37 | * Reserved namespace names | |
38 | * user-XXXX - user defined profiles | |
39 | * | |
40 | * a // in a profile or namespace name indicates a hierarchical name with the | |
41 | * name before the // being the parent and the name after the child. | |
42 | * | |
43 | * Profile and namespace hierarchies serve two different but similar purposes. | |
44 | * The namespace contains the set of visible profiles that are considered | |
45 | * for attachment. The hierarchy of namespaces allows for virtualizing | |
46 | * the namespace so that for example a chroot can have its own set of profiles | |
47 | * which may define some local user namespaces. | |
48 | * The profile hierarchy severs two distinct purposes, | |
49 | * - it allows for sub profiles or hats, which allows an application to run | |
50 | * subprograms under its own profile with different restriction than it | |
51 | * self, and not have it use the system profile. | |
52 | * eg. if a mail program starts an editor, the policy might make the | |
53 | * restrictions tighter on the editor tighter than the mail program, | |
54 | * and definitely different than general editor restrictions | |
55 | * - it allows for binary hierarchy of profiles, so that execution history | |
56 | * is preserved. This feature isn't exploited by AppArmor reference policy | |
57 | * but is allowed. NOTE: this is currently suboptimal because profile | |
58 | * aliasing is not currently implemented so that a profile for each | |
59 | * level must be defined. | |
60 | * eg. /bin/bash///bin/ls as a name would indicate /bin/ls was started | |
61 | * from /bin/bash | |
62 | * | |
63 | * A profile or namespace name that can contain one or more // separators | |
64 | * is referred to as an hname (hierarchical). | |
65 | * eg. /bin/bash//bin/ls | |
66 | * | |
67 | * An fqname is a name that may contain both namespace and profile hnames. | |
68 | * eg. :ns:/bin/bash//bin/ls | |
69 | * | |
70 | * NOTES: | |
71 | * - locking of profile lists is currently fairly coarse. All profile | |
72 | * lists within a namespace use the namespace lock. | |
73 | * FIXME: move profile lists to using rcu_lists | |
74 | */ | |
75 | ||
76 | #include <linux/slab.h> | |
77 | #include <linux/spinlock.h> | |
78 | #include <linux/string.h> | |
79 | ||
80 | #include "include/apparmor.h" | |
81 | #include "include/capability.h" | |
82 | #include "include/context.h" | |
83 | #include "include/file.h" | |
84 | #include "include/ipc.h" | |
85 | #include "include/match.h" | |
86 | #include "include/path.h" | |
87 | #include "include/policy.h" | |
cff281f6 | 88 | #include "include/policy_ns.h" |
c88d4c7b JJ |
89 | #include "include/policy_unpack.h" |
90 | #include "include/resource.h" | |
c88d4c7b JJ |
91 | |
92 | ||
0d259f04 | 93 | const char *const aa_profile_mode_names[] = { |
c88d4c7b JJ |
94 | "enforce", |
95 | "complain", | |
96 | "kill", | |
03816507 | 97 | "unconfined", |
c88d4c7b JJ |
98 | }; |
99 | ||
c88d4c7b | 100 | |
cff281f6 | 101 | /* requires profile list write lock held */ |
8399588a | 102 | void __aa_update_proxy(struct aa_profile *orig, struct aa_profile *new) |
c88d4c7b | 103 | { |
cff281f6 | 104 | struct aa_profile *tmp; |
c88d4c7b | 105 | |
8399588a | 106 | tmp = rcu_dereference_protected(orig->proxy->profile, |
cff281f6 | 107 | mutex_is_locked(&orig->ns->lock)); |
8399588a | 108 | rcu_assign_pointer(orig->proxy->profile, aa_get_profile(new)); |
d97d51d2 | 109 | orig->flags |= PFLAG_STALE; |
cff281f6 | 110 | aa_put_profile(tmp); |
c88d4c7b JJ |
111 | } |
112 | ||
113 | /** | |
114 | * __list_add_profile - add a profile to a list | |
115 | * @list: list to add it to (NOT NULL) | |
116 | * @profile: the profile to add (NOT NULL) | |
117 | * | |
118 | * refcount @profile, should be put by __list_remove_profile | |
119 | * | |
120 | * Requires: namespace lock be held, or list not be shared | |
121 | */ | |
122 | static void __list_add_profile(struct list_head *list, | |
123 | struct aa_profile *profile) | |
124 | { | |
01e2b670 | 125 | list_add_rcu(&profile->base.list, list); |
c88d4c7b JJ |
126 | /* get list reference */ |
127 | aa_get_profile(profile); | |
128 | } | |
129 | ||
130 | /** | |
131 | * __list_remove_profile - remove a profile from the list it is on | |
132 | * @profile: the profile to remove (NOT NULL) | |
133 | * | |
134 | * remove a profile from the list, warning generally removal should | |
135 | * be done with __replace_profile as most profile removals are | |
136 | * replacements to the unconfined profile. | |
137 | * | |
138 | * put @profile list refcount | |
139 | * | |
140 | * Requires: namespace lock be held, or list not have been live | |
141 | */ | |
142 | static void __list_remove_profile(struct aa_profile *profile) | |
143 | { | |
01e2b670 JJ |
144 | list_del_rcu(&profile->base.list); |
145 | aa_put_profile(profile); | |
c88d4c7b JJ |
146 | } |
147 | ||
c88d4c7b JJ |
148 | /** |
149 | * __remove_profile - remove old profile, and children | |
150 | * @profile: profile to be replaced (NOT NULL) | |
151 | * | |
152 | * Requires: namespace list lock be held, or list not be shared | |
153 | */ | |
154 | static void __remove_profile(struct aa_profile *profile) | |
155 | { | |
156 | /* release any children lists first */ | |
cff281f6 | 157 | __aa_profile_list_release(&profile->base.profiles); |
c88d4c7b | 158 | /* released by free_profile */ |
8399588a | 159 | __aa_update_proxy(profile, profile->ns->unconfined); |
0d259f04 | 160 | __aa_fs_profile_rmdir(profile); |
c88d4c7b JJ |
161 | __list_remove_profile(profile); |
162 | } | |
163 | ||
164 | /** | |
cff281f6 | 165 | * __aa_profile_list_release - remove all profiles on the list and put refs |
c88d4c7b JJ |
166 | * @head: list of profiles (NOT NULL) |
167 | * | |
168 | * Requires: namespace lock be held | |
169 | */ | |
cff281f6 | 170 | void __aa_profile_list_release(struct list_head *head) |
c88d4c7b JJ |
171 | { |
172 | struct aa_profile *profile, *tmp; | |
173 | list_for_each_entry_safe(profile, tmp, head, base.list) | |
174 | __remove_profile(profile); | |
175 | } | |
176 | ||
77b071b3 | 177 | |
8399588a | 178 | static void free_proxy(struct aa_proxy *p) |
77b071b3 | 179 | { |
8399588a | 180 | if (p) { |
4cd4fc77 | 181 | /* r->profile will not be updated any more as r is dead */ |
8399588a JJ |
182 | aa_put_profile(rcu_dereference_protected(p->profile, true)); |
183 | kzfree(p); | |
77b071b3 JJ |
184 | } |
185 | } | |
186 | ||
187 | ||
8399588a | 188 | void aa_free_proxy_kref(struct kref *kref) |
77b071b3 | 189 | { |
8399588a JJ |
190 | struct aa_proxy *p = container_of(kref, struct aa_proxy, count); |
191 | ||
192 | free_proxy(p); | |
77b071b3 JJ |
193 | } |
194 | ||
c88d4c7b | 195 | /** |
8651e1d6 | 196 | * aa_free_profile - free a profile |
c88d4c7b JJ |
197 | * @profile: the profile to free (MAYBE NULL) |
198 | * | |
199 | * Free a profile, its hats and null_profile. All references to the profile, | |
200 | * its hats and null_profile must have been put. | |
201 | * | |
202 | * If the profile was referenced from a task context, free_profile() will | |
203 | * be called from an rcu callback routine, so we must not sleep here. | |
204 | */ | |
8651e1d6 | 205 | void aa_free_profile(struct aa_profile *profile) |
c88d4c7b JJ |
206 | { |
207 | AA_DEBUG("%s(%p)\n", __func__, profile); | |
208 | ||
209 | if (!profile) | |
210 | return; | |
211 | ||
c88d4c7b | 212 | /* free children profiles */ |
fe6bb31f | 213 | aa_policy_destroy(&profile->base); |
01e2b670 | 214 | aa_put_profile(rcu_access_pointer(profile->parent)); |
c88d4c7b | 215 | |
98849dff | 216 | aa_put_ns(profile->ns); |
c88d4c7b JJ |
217 | kzfree(profile->rename); |
218 | ||
219 | aa_free_file_rules(&profile->file); | |
220 | aa_free_cap_rules(&profile->caps); | |
221 | aa_free_rlimit_rules(&profile->rlimits); | |
222 | ||
0d259f04 | 223 | kzfree(profile->dirname); |
c88d4c7b | 224 | aa_put_dfa(profile->xmatch); |
ad5ff3db | 225 | aa_put_dfa(profile->policy.dfa); |
8399588a | 226 | aa_put_proxy(profile->proxy); |
c88d4c7b | 227 | |
5cb3e91e | 228 | kzfree(profile->hash); |
c88d4c7b JJ |
229 | kzfree(profile); |
230 | } | |
231 | ||
01e2b670 JJ |
232 | /** |
233 | * aa_free_profile_rcu - free aa_profile by rcu (called by aa_free_profile_kref) | |
234 | * @head: rcu_head callback for freeing of a profile (NOT NULL) | |
235 | */ | |
236 | static void aa_free_profile_rcu(struct rcu_head *head) | |
237 | { | |
742058b0 JJ |
238 | struct aa_profile *p = container_of(head, struct aa_profile, rcu); |
239 | if (p->flags & PFLAG_NS_COUNT) | |
98849dff | 240 | aa_free_ns(p->ns); |
742058b0 | 241 | else |
8651e1d6 | 242 | aa_free_profile(p); |
01e2b670 JJ |
243 | } |
244 | ||
c88d4c7b JJ |
245 | /** |
246 | * aa_free_profile_kref - free aa_profile by kref (called by aa_put_profile) | |
247 | * @kr: kref callback for freeing of a profile (NOT NULL) | |
248 | */ | |
249 | void aa_free_profile_kref(struct kref *kref) | |
250 | { | |
fa2ac468 | 251 | struct aa_profile *p = container_of(kref, struct aa_profile, count); |
742058b0 | 252 | call_rcu(&p->rcu, aa_free_profile_rcu); |
c88d4c7b JJ |
253 | } |
254 | ||
4da05cc0 JJ |
255 | /** |
256 | * aa_alloc_profile - allocate, initialize and return a new profile | |
257 | * @hname: name of the profile (NOT NULL) | |
30b026a8 | 258 | * @gfp: allocation type |
4da05cc0 JJ |
259 | * |
260 | * Returns: refcount profile or NULL on failure | |
261 | */ | |
30b026a8 | 262 | struct aa_profile *aa_alloc_profile(const char *hname, gfp_t gfp) |
4da05cc0 JJ |
263 | { |
264 | struct aa_profile *profile; | |
265 | ||
266 | /* freed by free_profile - usually through aa_put_profile */ | |
30b026a8 | 267 | profile = kzalloc(sizeof(*profile), gfp); |
4da05cc0 JJ |
268 | if (!profile) |
269 | return NULL; | |
270 | ||
30b026a8 | 271 | profile->proxy = kzalloc(sizeof(struct aa_proxy), gfp); |
8399588a | 272 | if (!profile->proxy) |
77b071b3 | 273 | goto fail; |
8399588a | 274 | kref_init(&profile->proxy->count); |
77b071b3 | 275 | |
30b026a8 | 276 | if (!aa_policy_init(&profile->base, NULL, hname, gfp)) |
77b071b3 | 277 | goto fail; |
fa2ac468 | 278 | kref_init(&profile->count); |
4da05cc0 JJ |
279 | |
280 | /* refcount released by caller */ | |
281 | return profile; | |
77b071b3 JJ |
282 | |
283 | fail: | |
8399588a | 284 | kzfree(profile->proxy); |
77b071b3 JJ |
285 | kzfree(profile); |
286 | ||
287 | return NULL; | |
4da05cc0 JJ |
288 | } |
289 | ||
290 | /** | |
181f7c97 | 291 | * aa_new_null_profile - create or find a null-X learning profile |
4da05cc0 JJ |
292 | * @parent: profile that caused this profile to be created (NOT NULL) |
293 | * @hat: true if the null- learning profile is a hat | |
181f7c97 JJ |
294 | * @base: name to base the null profile off of |
295 | * @gfp: type of allocation | |
4da05cc0 | 296 | * |
181f7c97 JJ |
297 | * Find/Create a null- complain mode profile used in learning mode. The |
298 | * name of the profile is unique and follows the format of parent//null-XXX. | |
299 | * where XXX is based on the @name or if that fails or is not supplied | |
300 | * a unique number | |
4da05cc0 JJ |
301 | * |
302 | * null profiles are added to the profile list but the list does not | |
303 | * hold a count on them so that they are automatically released when | |
304 | * not in use. | |
305 | * | |
306 | * Returns: new refcounted profile else NULL on failure | |
307 | */ | |
181f7c97 JJ |
308 | struct aa_profile *aa_new_null_profile(struct aa_profile *parent, bool hat, |
309 | const char *base, gfp_t gfp) | |
4da05cc0 | 310 | { |
181f7c97 | 311 | struct aa_profile *profile; |
4da05cc0 | 312 | char *name; |
4da05cc0 | 313 | |
181f7c97 JJ |
314 | AA_BUG(!parent); |
315 | ||
316 | if (base) { | |
317 | name = kmalloc(strlen(parent->base.hname) + 8 + strlen(base), | |
318 | gfp); | |
319 | if (name) { | |
320 | sprintf(name, "%s//null-%s", parent->base.hname, base); | |
321 | goto name; | |
322 | } | |
323 | /* fall through to try shorter uniq */ | |
324 | } | |
325 | ||
326 | name = kmalloc(strlen(parent->base.hname) + 2 + 7 + 8, gfp); | |
4da05cc0 | 327 | if (!name) |
181f7c97 JJ |
328 | return NULL; |
329 | sprintf(name, "%s//null-%x", parent->base.hname, | |
330 | atomic_inc_return(&parent->ns->uniq_null)); | |
4da05cc0 | 331 | |
181f7c97 JJ |
332 | name: |
333 | /* lookup to see if this is a dup creation */ | |
334 | profile = aa_find_child(parent, basename(name)); | |
335 | if (profile) | |
336 | goto out; | |
337 | ||
338 | profile = aa_alloc_profile(name, gfp); | |
4da05cc0 JJ |
339 | if (!profile) |
340 | goto fail; | |
341 | ||
342 | profile->mode = APPARMOR_COMPLAIN; | |
181f7c97 | 343 | profile->flags |= PFLAG_NULL; |
4da05cc0 JJ |
344 | if (hat) |
345 | profile->flags |= PFLAG_HAT; | |
181f7c97 | 346 | profile->path_flags = parent->path_flags; |
4da05cc0 JJ |
347 | |
348 | /* released on free_profile */ | |
01e2b670 | 349 | rcu_assign_pointer(profile->parent, aa_get_profile(parent)); |
98849dff | 350 | profile->ns = aa_get_ns(parent->ns); |
11c236b8 JJ |
351 | profile->file.dfa = aa_get_dfa(nulldfa); |
352 | profile->policy.dfa = aa_get_dfa(nulldfa); | |
4da05cc0 | 353 | |
01e2b670 | 354 | mutex_lock(&profile->ns->lock); |
4da05cc0 | 355 | __list_add_profile(&parent->base.profiles, profile); |
01e2b670 | 356 | mutex_unlock(&profile->ns->lock); |
4da05cc0 JJ |
357 | |
358 | /* refcount released by caller */ | |
181f7c97 JJ |
359 | out: |
360 | kfree(name); | |
361 | ||
4da05cc0 JJ |
362 | return profile; |
363 | ||
364 | fail: | |
181f7c97 JJ |
365 | kfree(name); |
366 | aa_free_profile(profile); | |
4da05cc0 JJ |
367 | return NULL; |
368 | } | |
369 | ||
c88d4c7b JJ |
370 | /* TODO: profile accounting - setup in remove */ |
371 | ||
372 | /** | |
373 | * __find_child - find a profile on @head list with a name matching @name | |
374 | * @head: list to search (NOT NULL) | |
375 | * @name: name of profile (NOT NULL) | |
376 | * | |
01e2b670 | 377 | * Requires: rcu_read_lock be held |
c88d4c7b JJ |
378 | * |
379 | * Returns: unrefcounted profile ptr, or NULL if not found | |
380 | */ | |
381 | static struct aa_profile *__find_child(struct list_head *head, const char *name) | |
382 | { | |
383 | return (struct aa_profile *)__policy_find(head, name); | |
384 | } | |
385 | ||
386 | /** | |
387 | * __strn_find_child - find a profile on @head list using substring of @name | |
388 | * @head: list to search (NOT NULL) | |
389 | * @name: name of profile (NOT NULL) | |
390 | * @len: length of @name substring to match | |
391 | * | |
01e2b670 | 392 | * Requires: rcu_read_lock be held |
c88d4c7b JJ |
393 | * |
394 | * Returns: unrefcounted profile ptr, or NULL if not found | |
395 | */ | |
396 | static struct aa_profile *__strn_find_child(struct list_head *head, | |
397 | const char *name, int len) | |
398 | { | |
399 | return (struct aa_profile *)__policy_strn_find(head, name, len); | |
400 | } | |
401 | ||
402 | /** | |
403 | * aa_find_child - find a profile by @name in @parent | |
404 | * @parent: profile to search (NOT NULL) | |
405 | * @name: profile name to search for (NOT NULL) | |
406 | * | |
407 | * Returns: a refcounted profile or NULL if not found | |
408 | */ | |
409 | struct aa_profile *aa_find_child(struct aa_profile *parent, const char *name) | |
410 | { | |
411 | struct aa_profile *profile; | |
412 | ||
01e2b670 | 413 | rcu_read_lock(); |
de7c4cc9 JJ |
414 | do { |
415 | profile = __find_child(&parent->base.profiles, name); | |
416 | } while (profile && !aa_get_profile_not0(profile)); | |
01e2b670 | 417 | rcu_read_unlock(); |
c88d4c7b JJ |
418 | |
419 | /* refcount released by caller */ | |
420 | return profile; | |
421 | } | |
422 | ||
423 | /** | |
424 | * __lookup_parent - lookup the parent of a profile of name @hname | |
425 | * @ns: namespace to lookup profile in (NOT NULL) | |
426 | * @hname: hierarchical profile name to find parent of (NOT NULL) | |
427 | * | |
428 | * Lookups up the parent of a fully qualified profile name, the profile | |
429 | * that matches hname does not need to exist, in general this | |
430 | * is used to load a new profile. | |
431 | * | |
01e2b670 | 432 | * Requires: rcu_read_lock be held |
c88d4c7b JJ |
433 | * |
434 | * Returns: unrefcounted policy or NULL if not found | |
435 | */ | |
98849dff | 436 | static struct aa_policy *__lookup_parent(struct aa_ns *ns, |
c88d4c7b JJ |
437 | const char *hname) |
438 | { | |
439 | struct aa_policy *policy; | |
440 | struct aa_profile *profile = NULL; | |
441 | char *split; | |
442 | ||
443 | policy = &ns->base; | |
444 | ||
445 | for (split = strstr(hname, "//"); split;) { | |
446 | profile = __strn_find_child(&policy->profiles, hname, | |
447 | split - hname); | |
448 | if (!profile) | |
449 | return NULL; | |
450 | policy = &profile->base; | |
451 | hname = split + 2; | |
452 | split = strstr(hname, "//"); | |
453 | } | |
454 | if (!profile) | |
455 | return &ns->base; | |
456 | return &profile->base; | |
457 | } | |
458 | ||
459 | /** | |
1741e9eb | 460 | * __lookupn_profile - lookup the profile matching @hname |
c88d4c7b JJ |
461 | * @base: base list to start looking up profile name from (NOT NULL) |
462 | * @hname: hierarchical profile name (NOT NULL) | |
1741e9eb | 463 | * @n: length of @hname |
c88d4c7b | 464 | * |
01e2b670 | 465 | * Requires: rcu_read_lock be held |
c88d4c7b JJ |
466 | * |
467 | * Returns: unrefcounted profile pointer or NULL if not found | |
468 | * | |
469 | * Do a relative name lookup, recursing through profile tree. | |
470 | */ | |
1741e9eb JJ |
471 | static struct aa_profile *__lookupn_profile(struct aa_policy *base, |
472 | const char *hname, size_t n) | |
c88d4c7b JJ |
473 | { |
474 | struct aa_profile *profile = NULL; | |
1741e9eb | 475 | const char *split; |
c88d4c7b | 476 | |
1741e9eb JJ |
477 | for (split = strnstr(hname, "//", n); split; |
478 | split = strnstr(hname, "//", n)) { | |
c88d4c7b JJ |
479 | profile = __strn_find_child(&base->profiles, hname, |
480 | split - hname); | |
481 | if (!profile) | |
482 | return NULL; | |
483 | ||
484 | base = &profile->base; | |
1741e9eb | 485 | n -= split + 2 - hname; |
c88d4c7b | 486 | hname = split + 2; |
c88d4c7b JJ |
487 | } |
488 | ||
1741e9eb JJ |
489 | if (n) |
490 | return __strn_find_child(&base->profiles, hname, n); | |
491 | return NULL; | |
492 | } | |
c88d4c7b | 493 | |
1741e9eb JJ |
494 | static struct aa_profile *__lookup_profile(struct aa_policy *base, |
495 | const char *hname) | |
496 | { | |
497 | return __lookupn_profile(base, hname, strlen(hname)); | |
c88d4c7b JJ |
498 | } |
499 | ||
500 | /** | |
501 | * aa_lookup_profile - find a profile by its full or partial name | |
502 | * @ns: the namespace to start from (NOT NULL) | |
503 | * @hname: name to do lookup on. Does not contain namespace prefix (NOT NULL) | |
1741e9eb | 504 | * @n: size of @hname |
c88d4c7b JJ |
505 | * |
506 | * Returns: refcounted profile or NULL if not found | |
507 | */ | |
1741e9eb JJ |
508 | struct aa_profile *aa_lookupn_profile(struct aa_ns *ns, const char *hname, |
509 | size_t n) | |
c88d4c7b JJ |
510 | { |
511 | struct aa_profile *profile; | |
512 | ||
01e2b670 JJ |
513 | rcu_read_lock(); |
514 | do { | |
1741e9eb | 515 | profile = __lookupn_profile(&ns->base, hname, n); |
01e2b670 JJ |
516 | } while (profile && !aa_get_profile_not0(profile)); |
517 | rcu_read_unlock(); | |
c88d4c7b | 518 | |
bf83208e | 519 | /* the unconfined profile is not in the regular profile list */ |
1741e9eb | 520 | if (!profile && strncmp(hname, "unconfined", n) == 0) |
fa2ac468 | 521 | profile = aa_get_newest_profile(ns->unconfined); |
bf83208e | 522 | |
c88d4c7b JJ |
523 | /* refcount released by caller */ |
524 | return profile; | |
525 | } | |
526 | ||
1741e9eb JJ |
527 | struct aa_profile *aa_lookup_profile(struct aa_ns *ns, const char *hname) |
528 | { | |
529 | return aa_lookupn_profile(ns, hname, strlen(hname)); | |
530 | } | |
31617ddf JJ |
531 | |
532 | struct aa_profile *aa_fqlookupn_profile(struct aa_profile *base, | |
533 | const char *fqname, size_t n) | |
534 | { | |
535 | struct aa_profile *profile; | |
536 | struct aa_ns *ns; | |
537 | const char *name, *ns_name; | |
538 | size_t ns_len; | |
539 | ||
540 | name = aa_splitn_fqname(fqname, n, &ns_name, &ns_len); | |
541 | if (ns_name) { | |
542 | ns = aa_findn_ns(base->ns, ns_name, ns_len); | |
543 | if (!ns) | |
544 | return NULL; | |
545 | } else | |
546 | ns = aa_get_ns(base->ns); | |
547 | ||
548 | if (name) | |
549 | profile = aa_lookupn_profile(ns, name, n - (name - fqname)); | |
550 | else if (ns) | |
551 | /* default profile for ns, currently unconfined */ | |
552 | profile = aa_get_newest_profile(ns->unconfined); | |
553 | else | |
554 | profile = NULL; | |
555 | aa_put_ns(ns); | |
556 | ||
557 | return profile; | |
558 | } | |
559 | ||
c88d4c7b JJ |
560 | /** |
561 | * replacement_allowed - test to see if replacement is allowed | |
562 | * @profile: profile to test if it can be replaced (MAYBE NULL) | |
563 | * @noreplace: true if replacement shouldn't be allowed but addition is okay | |
564 | * @info: Returns - info about why replacement failed (NOT NULL) | |
565 | * | |
566 | * Returns: %0 if replacement allowed else error code | |
567 | */ | |
568 | static int replacement_allowed(struct aa_profile *profile, int noreplace, | |
569 | const char **info) | |
570 | { | |
571 | if (profile) { | |
572 | if (profile->flags & PFLAG_IMMUTABLE) { | |
573 | *info = "cannot replace immutible profile"; | |
574 | return -EPERM; | |
575 | } else if (noreplace) { | |
576 | *info = "profile already exists"; | |
577 | return -EEXIST; | |
578 | } | |
579 | } | |
580 | return 0; | |
581 | } | |
582 | ||
c88d4c7b JJ |
583 | /** |
584 | * aa_audit_policy - Do auditing of policy changes | |
a6f23300 | 585 | * @profile: profile to check if it can manage policy |
c88d4c7b JJ |
586 | * @op: policy operation being performed |
587 | * @gfp: memory allocation flags | |
588 | * @name: name of profile being manipulated (NOT NULL) | |
589 | * @info: any extra information to be audited (MAYBE NULL) | |
590 | * @error: error code | |
591 | * | |
592 | * Returns: the error to be returned after audit is done | |
593 | */ | |
a6f23300 JJ |
594 | static int audit_policy(struct aa_profile *profile, int op, gfp_t gfp, |
595 | const char *name, const char *info, int error) | |
c88d4c7b JJ |
596 | { |
597 | struct common_audit_data sa; | |
3b3b0e4f | 598 | struct apparmor_audit_data aad = {0,}; |
50c205f5 | 599 | sa.type = LSM_AUDIT_DATA_NONE; |
3b3b0e4f EP |
600 | sa.aad = &aad; |
601 | aad.op = op; | |
602 | aad.name = name; | |
603 | aad.info = info; | |
604 | aad.error = error; | |
c88d4c7b | 605 | |
a6f23300 | 606 | return aa_audit(AUDIT_APPARMOR_STATUS, profile, gfp, |
c88d4c7b JJ |
607 | &sa, NULL); |
608 | } | |
609 | ||
58acf9d9 JJ |
610 | bool policy_view_capable(void) |
611 | { | |
612 | struct user_namespace *user_ns = current_user_ns(); | |
613 | bool response = false; | |
614 | ||
615 | if (ns_capable(user_ns, CAP_MAC_ADMIN)) | |
616 | response = true; | |
617 | ||
618 | return response; | |
619 | } | |
620 | ||
621 | bool policy_admin_capable(void) | |
622 | { | |
623 | return policy_view_capable() && !aa_g_lock_policy; | |
624 | } | |
625 | ||
c88d4c7b JJ |
626 | /** |
627 | * aa_may_manage_policy - can the current task manage policy | |
628 | * @op: the policy manipulation operation being done | |
629 | * | |
630 | * Returns: true if the task is allowed to manipulate policy | |
631 | */ | |
632 | bool aa_may_manage_policy(int op) | |
633 | { | |
634 | /* check if loading policy is locked out */ | |
635 | if (aa_g_lock_policy) { | |
a6f23300 JJ |
636 | audit_policy(__aa_current_profile(), op, GFP_KERNEL, NULL, |
637 | "policy_locked", -EACCES); | |
c88d4c7b JJ |
638 | return 0; |
639 | } | |
640 | ||
58acf9d9 | 641 | if (!policy_admin_capable()) { |
a6f23300 JJ |
642 | audit_policy(__aa_current_profile(), op, GFP_KERNEL, NULL, |
643 | "not policy admin", -EACCES); | |
c88d4c7b JJ |
644 | return 0; |
645 | } | |
646 | ||
647 | return 1; | |
648 | } | |
649 | ||
dd51c848 JJ |
650 | static struct aa_profile *__list_lookup_parent(struct list_head *lh, |
651 | struct aa_profile *profile) | |
652 | { | |
6e474e30 | 653 | const char *base = basename(profile->base.hname); |
dd51c848 JJ |
654 | long len = base - profile->base.hname; |
655 | struct aa_load_ent *ent; | |
656 | ||
657 | /* parent won't have trailing // so remove from len */ | |
658 | if (len <= 2) | |
659 | return NULL; | |
660 | len -= 2; | |
661 | ||
662 | list_for_each_entry(ent, lh, list) { | |
663 | if (ent->new == profile) | |
664 | continue; | |
665 | if (strncmp(ent->new->base.hname, profile->base.hname, len) == | |
666 | 0 && ent->new->base.hname[len] == 0) | |
667 | return ent->new; | |
668 | } | |
669 | ||
670 | return NULL; | |
671 | } | |
672 | ||
673 | /** | |
674 | * __replace_profile - replace @old with @new on a list | |
675 | * @old: profile to be replaced (NOT NULL) | |
676 | * @new: profile to replace @old with (NOT NULL) | |
8399588a | 677 | * @share_proxy: transfer @old->proxy to @new |
dd51c848 JJ |
678 | * |
679 | * Will duplicate and refcount elements that @new inherits from @old | |
680 | * and will inherit @old children. | |
681 | * | |
682 | * refcount @new for list, put @old list refcount | |
683 | * | |
684 | * Requires: namespace list lock be held, or list not be shared | |
685 | */ | |
77b071b3 | 686 | static void __replace_profile(struct aa_profile *old, struct aa_profile *new, |
8399588a | 687 | bool share_proxy) |
dd51c848 JJ |
688 | { |
689 | struct aa_profile *child, *tmp; | |
690 | ||
691 | if (!list_empty(&old->base.profiles)) { | |
692 | LIST_HEAD(lh); | |
01e2b670 | 693 | list_splice_init_rcu(&old->base.profiles, &lh, synchronize_rcu); |
dd51c848 JJ |
694 | |
695 | list_for_each_entry_safe(child, tmp, &lh, base.list) { | |
696 | struct aa_profile *p; | |
697 | ||
698 | list_del_init(&child->base.list); | |
699 | p = __find_child(&new->base.profiles, child->base.name); | |
700 | if (p) { | |
701 | /* @p replaces @child */ | |
8399588a | 702 | __replace_profile(child, p, share_proxy); |
dd51c848 JJ |
703 | continue; |
704 | } | |
705 | ||
706 | /* inherit @child and its children */ | |
707 | /* TODO: update hname of inherited children */ | |
708 | /* list refcount transferred to @new */ | |
0d259f04 | 709 | p = aa_deref_parent(child); |
01e2b670 JJ |
710 | rcu_assign_pointer(child->parent, aa_get_profile(new)); |
711 | list_add_rcu(&child->base.list, &new->base.profiles); | |
712 | aa_put_profile(p); | |
dd51c848 JJ |
713 | } |
714 | } | |
715 | ||
01e2b670 | 716 | if (!rcu_access_pointer(new->parent)) { |
0d259f04 | 717 | struct aa_profile *parent = aa_deref_parent(old); |
01e2b670 JJ |
718 | rcu_assign_pointer(new->parent, aa_get_profile(parent)); |
719 | } | |
8399588a JJ |
720 | __aa_update_proxy(old, new); |
721 | if (share_proxy) { | |
722 | aa_put_proxy(new->proxy); | |
723 | new->proxy = aa_get_proxy(old->proxy); | |
724 | } else if (!rcu_access_pointer(new->proxy->profile)) | |
725 | /* aafs interface uses proxy */ | |
726 | rcu_assign_pointer(new->proxy->profile, | |
0d259f04 JJ |
727 | aa_get_profile(new)); |
728 | __aa_fs_profile_migrate_dents(old, new); | |
dd51c848 JJ |
729 | |
730 | if (list_empty(&new->base.list)) { | |
731 | /* new is not on a list already */ | |
01e2b670 | 732 | list_replace_rcu(&old->base.list, &new->base.list); |
dd51c848 JJ |
733 | aa_get_profile(new); |
734 | aa_put_profile(old); | |
735 | } else | |
736 | __list_remove_profile(old); | |
737 | } | |
738 | ||
739 | /** | |
740 | * __lookup_replace - lookup replacement information for a profile | |
741 | * @ns - namespace the lookup occurs in | |
742 | * @hname - name of profile to lookup | |
743 | * @noreplace - true if not replacing an existing profile | |
744 | * @p - Returns: profile to be replaced | |
745 | * @info - Returns: info string on why lookup failed | |
746 | * | |
747 | * Returns: profile to replace (no ref) on success else ptr error | |
748 | */ | |
98849dff | 749 | static int __lookup_replace(struct aa_ns *ns, const char *hname, |
dd51c848 JJ |
750 | bool noreplace, struct aa_profile **p, |
751 | const char **info) | |
752 | { | |
753 | *p = aa_get_profile(__lookup_profile(&ns->base, hname)); | |
754 | if (*p) { | |
755 | int error = replacement_allowed(*p, noreplace, info); | |
756 | if (error) { | |
757 | *info = "profile can not be replaced"; | |
758 | return error; | |
759 | } | |
760 | } | |
761 | ||
762 | return 0; | |
763 | } | |
764 | ||
c88d4c7b JJ |
765 | /** |
766 | * aa_replace_profiles - replace profile(s) on the profile list | |
73688d1e | 767 | * @view: namespace load is viewed from |
a6f23300 | 768 | * @profile: profile that is attempting to load/replace policy |
c88d4c7b JJ |
769 | * @udata: serialized data stream (NOT NULL) |
770 | * @size: size of the serialized data stream | |
771 | * @noreplace: true if only doing addition, no replacement allowed | |
772 | * | |
773 | * unpack and replace a profile on the profile list and uses of that profile | |
774 | * by any aa_task_cxt. If the profile does not exist on the profile list | |
775 | * it is added. | |
776 | * | |
777 | * Returns: size of data consumed else error code on failure. | |
778 | */ | |
73688d1e JJ |
779 | ssize_t aa_replace_profiles(struct aa_ns *view, void *udata, size_t size, |
780 | bool noreplace) | |
c88d4c7b | 781 | { |
bf15cf0c | 782 | const char *ns_name, *info = NULL; |
98849dff | 783 | struct aa_ns *ns = NULL; |
dd51c848 | 784 | struct aa_load_ent *ent, *tmp; |
c88d4c7b JJ |
785 | int op = OP_PROF_REPL; |
786 | ssize_t error; | |
dd51c848 | 787 | LIST_HEAD(lh); |
c88d4c7b JJ |
788 | |
789 | /* released below */ | |
dd51c848 JJ |
790 | error = aa_unpack(udata, size, &lh, &ns_name); |
791 | if (error) | |
792 | goto out; | |
c88d4c7b JJ |
793 | |
794 | /* released below */ | |
73688d1e | 795 | ns = aa_prepare_ns(view, ns_name); |
c88d4c7b | 796 | if (!ns) { |
a6f23300 JJ |
797 | error = audit_policy(__aa_current_profile(), op, GFP_KERNEL, |
798 | ns_name, | |
bf15cf0c JJ |
799 | "failed to prepare namespace", -ENOMEM); |
800 | goto free; | |
c88d4c7b JJ |
801 | } |
802 | ||
01e2b670 | 803 | mutex_lock(&ns->lock); |
dd51c848 JJ |
804 | /* setup parent and ns info */ |
805 | list_for_each_entry(ent, &lh, list) { | |
806 | struct aa_policy *policy; | |
dd51c848 JJ |
807 | error = __lookup_replace(ns, ent->new->base.hname, noreplace, |
808 | &ent->old, &info); | |
809 | if (error) | |
810 | goto fail_lock; | |
811 | ||
812 | if (ent->new->rename) { | |
813 | error = __lookup_replace(ns, ent->new->rename, | |
814 | noreplace, &ent->rename, | |
815 | &info); | |
816 | if (error) | |
817 | goto fail_lock; | |
c88d4c7b | 818 | } |
c88d4c7b | 819 | |
dd51c848 | 820 | /* released when @new is freed */ |
98849dff | 821 | ent->new->ns = aa_get_ns(ns); |
dd51c848 JJ |
822 | |
823 | if (ent->old || ent->rename) | |
824 | continue; | |
825 | ||
826 | /* no ref on policy only use inside lock */ | |
827 | policy = __lookup_parent(ns, ent->new->base.hname); | |
828 | if (!policy) { | |
829 | struct aa_profile *p; | |
830 | p = __list_lookup_parent(&lh, ent->new); | |
831 | if (!p) { | |
832 | error = -ENOENT; | |
833 | info = "parent does not exist"; | |
dd51c848 JJ |
834 | goto fail_lock; |
835 | } | |
01e2b670 JJ |
836 | rcu_assign_pointer(ent->new->parent, aa_get_profile(p)); |
837 | } else if (policy != &ns->base) { | |
dd51c848 | 838 | /* released on profile replacement or free_profile */ |
01e2b670 JJ |
839 | struct aa_profile *p = (struct aa_profile *) policy; |
840 | rcu_assign_pointer(ent->new->parent, aa_get_profile(p)); | |
841 | } | |
dd51c848 | 842 | } |
c88d4c7b | 843 | |
0d259f04 JJ |
844 | /* create new fs entries for introspection if needed */ |
845 | list_for_each_entry(ent, &lh, list) { | |
846 | if (ent->old) { | |
847 | /* inherit old interface files */ | |
848 | ||
849 | /* if (ent->rename) | |
850 | TODO: support rename */ | |
851 | /* } else if (ent->rename) { | |
852 | TODO: support rename */ | |
853 | } else { | |
854 | struct dentry *parent; | |
855 | if (rcu_access_pointer(ent->new->parent)) { | |
856 | struct aa_profile *p; | |
857 | p = aa_deref_parent(ent->new); | |
858 | parent = prof_child_dir(p); | |
859 | } else | |
860 | parent = ns_subprofs_dir(ent->new->ns); | |
861 | error = __aa_fs_profile_mkdir(ent->new, parent); | |
862 | } | |
863 | ||
864 | if (error) { | |
865 | info = "failed to create "; | |
866 | goto fail_lock; | |
867 | } | |
868 | } | |
869 | ||
870 | /* Done with checks that may fail - do actual replacement */ | |
dd51c848 JJ |
871 | list_for_each_entry_safe(ent, tmp, &lh, list) { |
872 | list_del_init(&ent->list); | |
873 | op = (!ent->old && !ent->rename) ? OP_PROF_LOAD : OP_PROF_REPL; | |
874 | ||
a6f23300 JJ |
875 | audit_policy(__aa_current_profile(), op, GFP_ATOMIC, |
876 | ent->new->base.hname, NULL, error); | |
dd51c848 JJ |
877 | |
878 | if (ent->old) { | |
77b071b3 | 879 | __replace_profile(ent->old, ent->new, 1); |
0d259f04 | 880 | if (ent->rename) { |
8399588a JJ |
881 | /* aafs interface uses proxy */ |
882 | struct aa_proxy *r = ent->new->proxy; | |
0d259f04 JJ |
883 | rcu_assign_pointer(r->profile, |
884 | aa_get_profile(ent->new)); | |
77b071b3 | 885 | __replace_profile(ent->rename, ent->new, 0); |
0d259f04 | 886 | } |
dd51c848 | 887 | } else if (ent->rename) { |
8399588a JJ |
888 | /* aafs interface uses proxy */ |
889 | rcu_assign_pointer(ent->new->proxy->profile, | |
0d259f04 | 890 | aa_get_profile(ent->new)); |
77b071b3 | 891 | __replace_profile(ent->rename, ent->new, 0); |
dd51c848 | 892 | } else if (ent->new->parent) { |
01e2b670 | 893 | struct aa_profile *parent, *newest; |
0d259f04 | 894 | parent = aa_deref_parent(ent->new); |
77b071b3 | 895 | newest = aa_get_newest_profile(parent); |
01e2b670 | 896 | |
dd51c848 | 897 | /* parent replaced in this atomic set? */ |
01e2b670 JJ |
898 | if (newest != parent) { |
899 | aa_get_profile(newest); | |
01e2b670 | 900 | rcu_assign_pointer(ent->new->parent, newest); |
f351841f | 901 | aa_put_profile(parent); |
dcda617a | 902 | } |
8399588a JJ |
903 | /* aafs interface uses proxy */ |
904 | rcu_assign_pointer(ent->new->proxy->profile, | |
0d259f04 | 905 | aa_get_profile(ent->new)); |
ec34fa24 | 906 | __list_add_profile(&newest->base.profiles, ent->new); |
dcda617a | 907 | aa_put_profile(newest); |
0d259f04 | 908 | } else { |
8399588a JJ |
909 | /* aafs interface uses proxy */ |
910 | rcu_assign_pointer(ent->new->proxy->profile, | |
0d259f04 | 911 | aa_get_profile(ent->new)); |
dd51c848 | 912 | __list_add_profile(&ns->base.profiles, ent->new); |
0d259f04 | 913 | } |
dd51c848 | 914 | aa_load_ent_free(ent); |
c88d4c7b | 915 | } |
01e2b670 | 916 | mutex_unlock(&ns->lock); |
c88d4c7b JJ |
917 | |
918 | out: | |
98849dff | 919 | aa_put_ns(ns); |
dd51c848 | 920 | |
c88d4c7b JJ |
921 | if (error) |
922 | return error; | |
923 | return size; | |
924 | ||
dd51c848 | 925 | fail_lock: |
01e2b670 | 926 | mutex_unlock(&ns->lock); |
dd51c848 | 927 | |
bf15cf0c JJ |
928 | /* audit cause of failure */ |
929 | op = (!ent->old) ? OP_PROF_LOAD : OP_PROF_REPL; | |
a6f23300 JJ |
930 | audit_policy(__aa_current_profile(), op, GFP_KERNEL, |
931 | ent->new->base.hname, info, error); | |
bf15cf0c JJ |
932 | /* audit status that rest of profiles in the atomic set failed too */ |
933 | info = "valid profile in failed atomic policy load"; | |
934 | list_for_each_entry(tmp, &lh, list) { | |
935 | if (tmp == ent) { | |
936 | info = "unchecked profile in failed atomic policy load"; | |
937 | /* skip entry that caused failure */ | |
938 | continue; | |
939 | } | |
940 | op = (!ent->old) ? OP_PROF_LOAD : OP_PROF_REPL; | |
a6f23300 JJ |
941 | audit_policy(__aa_current_profile(), op, GFP_KERNEL, |
942 | tmp->new->base.hname, info, error); | |
bf15cf0c JJ |
943 | } |
944 | free: | |
dd51c848 JJ |
945 | list_for_each_entry_safe(ent, tmp, &lh, list) { |
946 | list_del_init(&ent->list); | |
947 | aa_load_ent_free(ent); | |
948 | } | |
949 | ||
c88d4c7b JJ |
950 | goto out; |
951 | } | |
952 | ||
953 | /** | |
954 | * aa_remove_profiles - remove profile(s) from the system | |
b79473f2 | 955 | * @view: namespace the remove is being done from |
c88d4c7b JJ |
956 | * @fqname: name of the profile or namespace to remove (NOT NULL) |
957 | * @size: size of the name | |
958 | * | |
959 | * Remove a profile or sub namespace from the current namespace, so that | |
960 | * they can not be found anymore and mark them as replaced by unconfined | |
961 | * | |
962 | * NOTE: removing confinement does not restore rlimits to preconfinemnet values | |
963 | * | |
964 | * Returns: size of data consume else error code if fails | |
965 | */ | |
b79473f2 | 966 | ssize_t aa_remove_profiles(struct aa_ns *view, char *fqname, size_t size) |
c88d4c7b | 967 | { |
b79473f2 | 968 | struct aa_ns *root = NULL, *ns = NULL; |
c88d4c7b JJ |
969 | struct aa_profile *profile = NULL; |
970 | const char *name = fqname, *info = NULL; | |
971 | ssize_t error = 0; | |
972 | ||
973 | if (*fqname == 0) { | |
974 | info = "no profile specified"; | |
975 | error = -ENOENT; | |
976 | goto fail; | |
977 | } | |
978 | ||
b79473f2 | 979 | root = view; |
c88d4c7b JJ |
980 | |
981 | if (fqname[0] == ':') { | |
982 | char *ns_name; | |
983 | name = aa_split_fqname(fqname, &ns_name); | |
41d1b3e8 | 984 | /* released below */ |
98849dff | 985 | ns = aa_find_ns(root, ns_name); |
41d1b3e8 JJ |
986 | if (!ns) { |
987 | info = "namespace does not exist"; | |
988 | error = -ENOENT; | |
989 | goto fail; | |
c88d4c7b JJ |
990 | } |
991 | } else | |
992 | /* released below */ | |
98849dff | 993 | ns = aa_get_ns(root); |
c88d4c7b | 994 | |
c88d4c7b JJ |
995 | if (!name) { |
996 | /* remove namespace - can only happen if fqname[0] == ':' */ | |
01e2b670 | 997 | mutex_lock(&ns->parent->lock); |
98849dff | 998 | __aa_remove_ns(ns); |
01e2b670 | 999 | mutex_unlock(&ns->parent->lock); |
c88d4c7b JJ |
1000 | } else { |
1001 | /* remove profile */ | |
01e2b670 | 1002 | mutex_lock(&ns->lock); |
c88d4c7b JJ |
1003 | profile = aa_get_profile(__lookup_profile(&ns->base, name)); |
1004 | if (!profile) { | |
1005 | error = -ENOENT; | |
1006 | info = "profile does not exist"; | |
1007 | goto fail_ns_lock; | |
1008 | } | |
1009 | name = profile->base.hname; | |
1010 | __remove_profile(profile); | |
01e2b670 | 1011 | mutex_unlock(&ns->lock); |
c88d4c7b | 1012 | } |
c88d4c7b JJ |
1013 | |
1014 | /* don't fail removal if audit fails */ | |
a6f23300 JJ |
1015 | (void) audit_policy(__aa_current_profile(), OP_PROF_RM, GFP_KERNEL, |
1016 | name, info, error); | |
98849dff | 1017 | aa_put_ns(ns); |
c88d4c7b JJ |
1018 | aa_put_profile(profile); |
1019 | return size; | |
1020 | ||
1021 | fail_ns_lock: | |
01e2b670 | 1022 | mutex_unlock(&ns->lock); |
98849dff | 1023 | aa_put_ns(ns); |
c88d4c7b JJ |
1024 | |
1025 | fail: | |
a6f23300 JJ |
1026 | (void) audit_policy(__aa_current_profile(), OP_PROF_RM, GFP_KERNEL, |
1027 | name, info, error); | |
c88d4c7b JJ |
1028 | return error; |
1029 | } |