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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> | |
5b825c3a | 79 | #include <linux/cred.h> |
b2d09103 | 80 | #include <linux/rculist.h> |
2bd8dbbf | 81 | #include <linux/user_namespace.h> |
c88d4c7b JJ |
82 | |
83 | #include "include/apparmor.h" | |
84 | #include "include/capability.h" | |
85 | #include "include/context.h" | |
86 | #include "include/file.h" | |
87 | #include "include/ipc.h" | |
88 | #include "include/match.h" | |
89 | #include "include/path.h" | |
90 | #include "include/policy.h" | |
cff281f6 | 91 | #include "include/policy_ns.h" |
c88d4c7b JJ |
92 | #include "include/policy_unpack.h" |
93 | #include "include/resource.h" | |
c88d4c7b | 94 | |
2bd8dbbf | 95 | int unprivileged_userns_apparmor_policy = 1; |
c88d4c7b | 96 | |
0d259f04 | 97 | const char *const aa_profile_mode_names[] = { |
c88d4c7b JJ |
98 | "enforce", |
99 | "complain", | |
100 | "kill", | |
03816507 | 101 | "unconfined", |
c88d4c7b JJ |
102 | }; |
103 | ||
cff281f6 | 104 | /* requires profile list write lock held */ |
8399588a | 105 | void __aa_update_proxy(struct aa_profile *orig, struct aa_profile *new) |
c88d4c7b | 106 | { |
cff281f6 | 107 | struct aa_profile *tmp; |
c88d4c7b | 108 | |
8399588a | 109 | tmp = rcu_dereference_protected(orig->proxy->profile, |
cff281f6 | 110 | mutex_is_locked(&orig->ns->lock)); |
8399588a | 111 | rcu_assign_pointer(orig->proxy->profile, aa_get_profile(new)); |
d97d51d2 | 112 | orig->flags |= PFLAG_STALE; |
cff281f6 | 113 | aa_put_profile(tmp); |
c88d4c7b JJ |
114 | } |
115 | ||
116 | /** | |
117 | * __list_add_profile - add a profile to a list | |
118 | * @list: list to add it to (NOT NULL) | |
119 | * @profile: the profile to add (NOT NULL) | |
120 | * | |
121 | * refcount @profile, should be put by __list_remove_profile | |
122 | * | |
123 | * Requires: namespace lock be held, or list not be shared | |
124 | */ | |
125 | static void __list_add_profile(struct list_head *list, | |
126 | struct aa_profile *profile) | |
127 | { | |
01e2b670 | 128 | list_add_rcu(&profile->base.list, list); |
c88d4c7b JJ |
129 | /* get list reference */ |
130 | aa_get_profile(profile); | |
131 | } | |
132 | ||
133 | /** | |
134 | * __list_remove_profile - remove a profile from the list it is on | |
135 | * @profile: the profile to remove (NOT NULL) | |
136 | * | |
137 | * remove a profile from the list, warning generally removal should | |
138 | * be done with __replace_profile as most profile removals are | |
139 | * replacements to the unconfined profile. | |
140 | * | |
141 | * put @profile list refcount | |
142 | * | |
143 | * Requires: namespace lock be held, or list not have been live | |
144 | */ | |
145 | static void __list_remove_profile(struct aa_profile *profile) | |
146 | { | |
01e2b670 JJ |
147 | list_del_rcu(&profile->base.list); |
148 | aa_put_profile(profile); | |
c88d4c7b JJ |
149 | } |
150 | ||
c88d4c7b JJ |
151 | /** |
152 | * __remove_profile - remove old profile, and children | |
153 | * @profile: profile to be replaced (NOT NULL) | |
154 | * | |
155 | * Requires: namespace list lock be held, or list not be shared | |
156 | */ | |
157 | static void __remove_profile(struct aa_profile *profile) | |
158 | { | |
159 | /* release any children lists first */ | |
cff281f6 | 160 | __aa_profile_list_release(&profile->base.profiles); |
c88d4c7b | 161 | /* released by free_profile */ |
8399588a | 162 | __aa_update_proxy(profile, profile->ns->unconfined); |
c97204ba | 163 | __aafs_profile_rmdir(profile); |
c88d4c7b JJ |
164 | __list_remove_profile(profile); |
165 | } | |
166 | ||
167 | /** | |
cff281f6 | 168 | * __aa_profile_list_release - remove all profiles on the list and put refs |
c88d4c7b JJ |
169 | * @head: list of profiles (NOT NULL) |
170 | * | |
171 | * Requires: namespace lock be held | |
172 | */ | |
cff281f6 | 173 | void __aa_profile_list_release(struct list_head *head) |
c88d4c7b JJ |
174 | { |
175 | struct aa_profile *profile, *tmp; | |
176 | list_for_each_entry_safe(profile, tmp, head, base.list) | |
177 | __remove_profile(profile); | |
178 | } | |
179 | ||
77b071b3 | 180 | |
8399588a | 181 | static void free_proxy(struct aa_proxy *p) |
77b071b3 | 182 | { |
8399588a | 183 | if (p) { |
4cd4fc77 | 184 | /* r->profile will not be updated any more as r is dead */ |
8399588a JJ |
185 | aa_put_profile(rcu_dereference_protected(p->profile, true)); |
186 | kzfree(p); | |
77b071b3 JJ |
187 | } |
188 | } | |
189 | ||
190 | ||
8399588a | 191 | void aa_free_proxy_kref(struct kref *kref) |
77b071b3 | 192 | { |
8399588a JJ |
193 | struct aa_proxy *p = container_of(kref, struct aa_proxy, count); |
194 | ||
195 | free_proxy(p); | |
77b071b3 JJ |
196 | } |
197 | ||
e025be0f WH |
198 | /** |
199 | * aa_free_data - free a data blob | |
200 | * @ptr: data to free | |
201 | * @arg: unused | |
202 | */ | |
203 | static void aa_free_data(void *ptr, void *arg) | |
204 | { | |
205 | struct aa_data *data = ptr; | |
206 | ||
207 | kzfree(data->data); | |
208 | kzfree(data->key); | |
209 | kzfree(data); | |
210 | } | |
211 | ||
c88d4c7b | 212 | /** |
8651e1d6 | 213 | * aa_free_profile - free a profile |
c88d4c7b JJ |
214 | * @profile: the profile to free (MAYBE NULL) |
215 | * | |
216 | * Free a profile, its hats and null_profile. All references to the profile, | |
217 | * its hats and null_profile must have been put. | |
218 | * | |
219 | * If the profile was referenced from a task context, free_profile() will | |
220 | * be called from an rcu callback routine, so we must not sleep here. | |
221 | */ | |
8651e1d6 | 222 | void aa_free_profile(struct aa_profile *profile) |
c88d4c7b | 223 | { |
e025be0f WH |
224 | struct rhashtable *rht; |
225 | ||
c88d4c7b JJ |
226 | AA_DEBUG("%s(%p)\n", __func__, profile); |
227 | ||
228 | if (!profile) | |
229 | return; | |
230 | ||
c88d4c7b | 231 | /* free children profiles */ |
fe6bb31f | 232 | aa_policy_destroy(&profile->base); |
01e2b670 | 233 | aa_put_profile(rcu_access_pointer(profile->parent)); |
c88d4c7b | 234 | |
98849dff | 235 | aa_put_ns(profile->ns); |
c88d4c7b JJ |
236 | kzfree(profile->rename); |
237 | ||
238 | aa_free_file_rules(&profile->file); | |
239 | aa_free_cap_rules(&profile->caps); | |
240 | aa_free_rlimit_rules(&profile->rlimits); | |
241 | ||
0d259f04 | 242 | kzfree(profile->dirname); |
c88d4c7b | 243 | aa_put_dfa(profile->xmatch); |
ad5ff3db | 244 | aa_put_dfa(profile->policy.dfa); |
8399588a | 245 | aa_put_proxy(profile->proxy); |
c88d4c7b | 246 | |
e025be0f WH |
247 | if (profile->data) { |
248 | rht = profile->data; | |
249 | profile->data = NULL; | |
250 | rhashtable_free_and_destroy(rht, aa_free_data, NULL); | |
251 | kzfree(rht); | |
252 | } | |
253 | ||
5cb3e91e | 254 | kzfree(profile->hash); |
5ac8c355 | 255 | aa_put_loaddata(profile->rawdata); |
c88d4c7b JJ |
256 | kzfree(profile); |
257 | } | |
258 | ||
01e2b670 JJ |
259 | /** |
260 | * aa_free_profile_rcu - free aa_profile by rcu (called by aa_free_profile_kref) | |
261 | * @head: rcu_head callback for freeing of a profile (NOT NULL) | |
262 | */ | |
263 | static void aa_free_profile_rcu(struct rcu_head *head) | |
264 | { | |
742058b0 JJ |
265 | struct aa_profile *p = container_of(head, struct aa_profile, rcu); |
266 | if (p->flags & PFLAG_NS_COUNT) | |
98849dff | 267 | aa_free_ns(p->ns); |
742058b0 | 268 | else |
8651e1d6 | 269 | aa_free_profile(p); |
01e2b670 JJ |
270 | } |
271 | ||
c88d4c7b JJ |
272 | /** |
273 | * aa_free_profile_kref - free aa_profile by kref (called by aa_put_profile) | |
274 | * @kr: kref callback for freeing of a profile (NOT NULL) | |
275 | */ | |
276 | void aa_free_profile_kref(struct kref *kref) | |
277 | { | |
fa2ac468 | 278 | struct aa_profile *p = container_of(kref, struct aa_profile, count); |
742058b0 | 279 | call_rcu(&p->rcu, aa_free_profile_rcu); |
c88d4c7b JJ |
280 | } |
281 | ||
4da05cc0 JJ |
282 | /** |
283 | * aa_alloc_profile - allocate, initialize and return a new profile | |
284 | * @hname: name of the profile (NOT NULL) | |
30b026a8 | 285 | * @gfp: allocation type |
4da05cc0 JJ |
286 | * |
287 | * Returns: refcount profile or NULL on failure | |
288 | */ | |
30b026a8 | 289 | struct aa_profile *aa_alloc_profile(const char *hname, gfp_t gfp) |
4da05cc0 JJ |
290 | { |
291 | struct aa_profile *profile; | |
292 | ||
293 | /* freed by free_profile - usually through aa_put_profile */ | |
30b026a8 | 294 | profile = kzalloc(sizeof(*profile), gfp); |
4da05cc0 JJ |
295 | if (!profile) |
296 | return NULL; | |
297 | ||
30b026a8 | 298 | profile->proxy = kzalloc(sizeof(struct aa_proxy), gfp); |
8399588a | 299 | if (!profile->proxy) |
77b071b3 | 300 | goto fail; |
8399588a | 301 | kref_init(&profile->proxy->count); |
77b071b3 | 302 | |
30b026a8 | 303 | if (!aa_policy_init(&profile->base, NULL, hname, gfp)) |
77b071b3 | 304 | goto fail; |
fa2ac468 | 305 | kref_init(&profile->count); |
4da05cc0 JJ |
306 | |
307 | /* refcount released by caller */ | |
308 | return profile; | |
77b071b3 JJ |
309 | |
310 | fail: | |
8399588a | 311 | kzfree(profile->proxy); |
77b071b3 JJ |
312 | kzfree(profile); |
313 | ||
314 | return NULL; | |
4da05cc0 JJ |
315 | } |
316 | ||
317 | /** | |
181f7c97 | 318 | * aa_new_null_profile - create or find a null-X learning profile |
4da05cc0 JJ |
319 | * @parent: profile that caused this profile to be created (NOT NULL) |
320 | * @hat: true if the null- learning profile is a hat | |
181f7c97 JJ |
321 | * @base: name to base the null profile off of |
322 | * @gfp: type of allocation | |
4da05cc0 | 323 | * |
181f7c97 JJ |
324 | * Find/Create a null- complain mode profile used in learning mode. The |
325 | * name of the profile is unique and follows the format of parent//null-XXX. | |
326 | * where XXX is based on the @name or if that fails or is not supplied | |
327 | * a unique number | |
4da05cc0 JJ |
328 | * |
329 | * null profiles are added to the profile list but the list does not | |
330 | * hold a count on them so that they are automatically released when | |
331 | * not in use. | |
332 | * | |
333 | * Returns: new refcounted profile else NULL on failure | |
334 | */ | |
181f7c97 JJ |
335 | struct aa_profile *aa_new_null_profile(struct aa_profile *parent, bool hat, |
336 | const char *base, gfp_t gfp) | |
4da05cc0 | 337 | { |
181f7c97 | 338 | struct aa_profile *profile; |
4da05cc0 | 339 | char *name; |
4da05cc0 | 340 | |
181f7c97 JJ |
341 | AA_BUG(!parent); |
342 | ||
343 | if (base) { | |
344 | name = kmalloc(strlen(parent->base.hname) + 8 + strlen(base), | |
345 | gfp); | |
346 | if (name) { | |
347 | sprintf(name, "%s//null-%s", parent->base.hname, base); | |
348 | goto name; | |
349 | } | |
350 | /* fall through to try shorter uniq */ | |
351 | } | |
352 | ||
353 | name = kmalloc(strlen(parent->base.hname) + 2 + 7 + 8, gfp); | |
4da05cc0 | 354 | if (!name) |
181f7c97 JJ |
355 | return NULL; |
356 | sprintf(name, "%s//null-%x", parent->base.hname, | |
357 | atomic_inc_return(&parent->ns->uniq_null)); | |
4da05cc0 | 358 | |
181f7c97 JJ |
359 | name: |
360 | /* lookup to see if this is a dup creation */ | |
361 | profile = aa_find_child(parent, basename(name)); | |
362 | if (profile) | |
363 | goto out; | |
364 | ||
365 | profile = aa_alloc_profile(name, gfp); | |
4da05cc0 JJ |
366 | if (!profile) |
367 | goto fail; | |
368 | ||
369 | profile->mode = APPARMOR_COMPLAIN; | |
181f7c97 | 370 | profile->flags |= PFLAG_NULL; |
4da05cc0 JJ |
371 | if (hat) |
372 | profile->flags |= PFLAG_HAT; | |
181f7c97 | 373 | profile->path_flags = parent->path_flags; |
4da05cc0 JJ |
374 | |
375 | /* released on free_profile */ | |
01e2b670 | 376 | rcu_assign_pointer(profile->parent, aa_get_profile(parent)); |
98849dff | 377 | profile->ns = aa_get_ns(parent->ns); |
11c236b8 JJ |
378 | profile->file.dfa = aa_get_dfa(nulldfa); |
379 | profile->policy.dfa = aa_get_dfa(nulldfa); | |
4da05cc0 | 380 | |
01e2b670 | 381 | mutex_lock(&profile->ns->lock); |
4da05cc0 | 382 | __list_add_profile(&parent->base.profiles, profile); |
01e2b670 | 383 | mutex_unlock(&profile->ns->lock); |
4da05cc0 JJ |
384 | |
385 | /* refcount released by caller */ | |
181f7c97 JJ |
386 | out: |
387 | kfree(name); | |
388 | ||
4da05cc0 JJ |
389 | return profile; |
390 | ||
391 | fail: | |
181f7c97 JJ |
392 | kfree(name); |
393 | aa_free_profile(profile); | |
4da05cc0 JJ |
394 | return NULL; |
395 | } | |
396 | ||
c88d4c7b JJ |
397 | /* TODO: profile accounting - setup in remove */ |
398 | ||
399 | /** | |
400 | * __find_child - find a profile on @head list with a name matching @name | |
401 | * @head: list to search (NOT NULL) | |
402 | * @name: name of profile (NOT NULL) | |
403 | * | |
01e2b670 | 404 | * Requires: rcu_read_lock be held |
c88d4c7b JJ |
405 | * |
406 | * Returns: unrefcounted profile ptr, or NULL if not found | |
407 | */ | |
408 | static struct aa_profile *__find_child(struct list_head *head, const char *name) | |
409 | { | |
410 | return (struct aa_profile *)__policy_find(head, name); | |
411 | } | |
412 | ||
413 | /** | |
414 | * __strn_find_child - find a profile on @head list using substring of @name | |
415 | * @head: list to search (NOT NULL) | |
416 | * @name: name of profile (NOT NULL) | |
417 | * @len: length of @name substring to match | |
418 | * | |
01e2b670 | 419 | * Requires: rcu_read_lock be held |
c88d4c7b JJ |
420 | * |
421 | * Returns: unrefcounted profile ptr, or NULL if not found | |
422 | */ | |
423 | static struct aa_profile *__strn_find_child(struct list_head *head, | |
424 | const char *name, int len) | |
425 | { | |
426 | return (struct aa_profile *)__policy_strn_find(head, name, len); | |
427 | } | |
428 | ||
429 | /** | |
430 | * aa_find_child - find a profile by @name in @parent | |
431 | * @parent: profile to search (NOT NULL) | |
432 | * @name: profile name to search for (NOT NULL) | |
433 | * | |
434 | * Returns: a refcounted profile or NULL if not found | |
435 | */ | |
436 | struct aa_profile *aa_find_child(struct aa_profile *parent, const char *name) | |
437 | { | |
438 | struct aa_profile *profile; | |
439 | ||
01e2b670 | 440 | rcu_read_lock(); |
de7c4cc9 JJ |
441 | do { |
442 | profile = __find_child(&parent->base.profiles, name); | |
443 | } while (profile && !aa_get_profile_not0(profile)); | |
01e2b670 | 444 | rcu_read_unlock(); |
c88d4c7b JJ |
445 | |
446 | /* refcount released by caller */ | |
447 | return profile; | |
448 | } | |
449 | ||
450 | /** | |
451 | * __lookup_parent - lookup the parent of a profile of name @hname | |
452 | * @ns: namespace to lookup profile in (NOT NULL) | |
453 | * @hname: hierarchical profile name to find parent of (NOT NULL) | |
454 | * | |
455 | * Lookups up the parent of a fully qualified profile name, the profile | |
456 | * that matches hname does not need to exist, in general this | |
457 | * is used to load a new profile. | |
458 | * | |
01e2b670 | 459 | * Requires: rcu_read_lock be held |
c88d4c7b JJ |
460 | * |
461 | * Returns: unrefcounted policy or NULL if not found | |
462 | */ | |
98849dff | 463 | static struct aa_policy *__lookup_parent(struct aa_ns *ns, |
c88d4c7b JJ |
464 | const char *hname) |
465 | { | |
466 | struct aa_policy *policy; | |
467 | struct aa_profile *profile = NULL; | |
468 | char *split; | |
469 | ||
470 | policy = &ns->base; | |
471 | ||
472 | for (split = strstr(hname, "//"); split;) { | |
473 | profile = __strn_find_child(&policy->profiles, hname, | |
474 | split - hname); | |
475 | if (!profile) | |
476 | return NULL; | |
477 | policy = &profile->base; | |
478 | hname = split + 2; | |
479 | split = strstr(hname, "//"); | |
480 | } | |
481 | if (!profile) | |
482 | return &ns->base; | |
483 | return &profile->base; | |
484 | } | |
485 | ||
486 | /** | |
1741e9eb | 487 | * __lookupn_profile - lookup the profile matching @hname |
c88d4c7b JJ |
488 | * @base: base list to start looking up profile name from (NOT NULL) |
489 | * @hname: hierarchical profile name (NOT NULL) | |
1741e9eb | 490 | * @n: length of @hname |
c88d4c7b | 491 | * |
01e2b670 | 492 | * Requires: rcu_read_lock be held |
c88d4c7b JJ |
493 | * |
494 | * Returns: unrefcounted profile pointer or NULL if not found | |
495 | * | |
496 | * Do a relative name lookup, recursing through profile tree. | |
497 | */ | |
1741e9eb JJ |
498 | static struct aa_profile *__lookupn_profile(struct aa_policy *base, |
499 | const char *hname, size_t n) | |
c88d4c7b JJ |
500 | { |
501 | struct aa_profile *profile = NULL; | |
1741e9eb | 502 | const char *split; |
c88d4c7b | 503 | |
1741e9eb JJ |
504 | for (split = strnstr(hname, "//", n); split; |
505 | split = strnstr(hname, "//", n)) { | |
c88d4c7b JJ |
506 | profile = __strn_find_child(&base->profiles, hname, |
507 | split - hname); | |
508 | if (!profile) | |
509 | return NULL; | |
510 | ||
511 | base = &profile->base; | |
1741e9eb | 512 | n -= split + 2 - hname; |
c88d4c7b | 513 | hname = split + 2; |
c88d4c7b JJ |
514 | } |
515 | ||
1741e9eb JJ |
516 | if (n) |
517 | return __strn_find_child(&base->profiles, hname, n); | |
518 | return NULL; | |
519 | } | |
c88d4c7b | 520 | |
1741e9eb JJ |
521 | static struct aa_profile *__lookup_profile(struct aa_policy *base, |
522 | const char *hname) | |
523 | { | |
524 | return __lookupn_profile(base, hname, strlen(hname)); | |
c88d4c7b JJ |
525 | } |
526 | ||
527 | /** | |
528 | * aa_lookup_profile - find a profile by its full or partial name | |
529 | * @ns: the namespace to start from (NOT NULL) | |
530 | * @hname: name to do lookup on. Does not contain namespace prefix (NOT NULL) | |
1741e9eb | 531 | * @n: size of @hname |
c88d4c7b JJ |
532 | * |
533 | * Returns: refcounted profile or NULL if not found | |
534 | */ | |
1741e9eb JJ |
535 | struct aa_profile *aa_lookupn_profile(struct aa_ns *ns, const char *hname, |
536 | size_t n) | |
c88d4c7b JJ |
537 | { |
538 | struct aa_profile *profile; | |
539 | ||
01e2b670 JJ |
540 | rcu_read_lock(); |
541 | do { | |
1741e9eb | 542 | profile = __lookupn_profile(&ns->base, hname, n); |
01e2b670 JJ |
543 | } while (profile && !aa_get_profile_not0(profile)); |
544 | rcu_read_unlock(); | |
c88d4c7b | 545 | |
bf83208e | 546 | /* the unconfined profile is not in the regular profile list */ |
1741e9eb | 547 | if (!profile && strncmp(hname, "unconfined", n) == 0) |
fa2ac468 | 548 | profile = aa_get_newest_profile(ns->unconfined); |
bf83208e | 549 | |
c88d4c7b JJ |
550 | /* refcount released by caller */ |
551 | return profile; | |
552 | } | |
553 | ||
1741e9eb JJ |
554 | struct aa_profile *aa_lookup_profile(struct aa_ns *ns, const char *hname) |
555 | { | |
556 | return aa_lookupn_profile(ns, hname, strlen(hname)); | |
557 | } | |
31617ddf JJ |
558 | |
559 | struct aa_profile *aa_fqlookupn_profile(struct aa_profile *base, | |
560 | const char *fqname, size_t n) | |
561 | { | |
562 | struct aa_profile *profile; | |
563 | struct aa_ns *ns; | |
564 | const char *name, *ns_name; | |
565 | size_t ns_len; | |
566 | ||
567 | name = aa_splitn_fqname(fqname, n, &ns_name, &ns_len); | |
568 | if (ns_name) { | |
569 | ns = aa_findn_ns(base->ns, ns_name, ns_len); | |
570 | if (!ns) | |
571 | return NULL; | |
572 | } else | |
573 | ns = aa_get_ns(base->ns); | |
574 | ||
575 | if (name) | |
576 | profile = aa_lookupn_profile(ns, name, n - (name - fqname)); | |
577 | else if (ns) | |
578 | /* default profile for ns, currently unconfined */ | |
579 | profile = aa_get_newest_profile(ns->unconfined); | |
580 | else | |
581 | profile = NULL; | |
582 | aa_put_ns(ns); | |
583 | ||
584 | return profile; | |
585 | } | |
586 | ||
c88d4c7b JJ |
587 | /** |
588 | * replacement_allowed - test to see if replacement is allowed | |
589 | * @profile: profile to test if it can be replaced (MAYBE NULL) | |
590 | * @noreplace: true if replacement shouldn't be allowed but addition is okay | |
591 | * @info: Returns - info about why replacement failed (NOT NULL) | |
592 | * | |
593 | * Returns: %0 if replacement allowed else error code | |
594 | */ | |
595 | static int replacement_allowed(struct aa_profile *profile, int noreplace, | |
596 | const char **info) | |
597 | { | |
598 | if (profile) { | |
599 | if (profile->flags & PFLAG_IMMUTABLE) { | |
600 | *info = "cannot replace immutible profile"; | |
601 | return -EPERM; | |
602 | } else if (noreplace) { | |
603 | *info = "profile already exists"; | |
604 | return -EEXIST; | |
605 | } | |
606 | } | |
607 | return 0; | |
608 | } | |
609 | ||
fc1c9fd1 JJ |
610 | /* audit callback for net specific fields */ |
611 | static void audit_cb(struct audit_buffer *ab, void *va) | |
612 | { | |
613 | struct common_audit_data *sa = va; | |
614 | ||
ef88a7ac | 615 | if (aad(sa)->iface.ns) { |
fc1c9fd1 | 616 | audit_log_format(ab, " ns="); |
ef88a7ac | 617 | audit_log_untrustedstring(ab, aad(sa)->iface.ns); |
fc1c9fd1 JJ |
618 | } |
619 | } | |
620 | ||
c88d4c7b JJ |
621 | /** |
622 | * aa_audit_policy - Do auditing of policy changes | |
a6f23300 | 623 | * @profile: profile to check if it can manage policy |
c88d4c7b JJ |
624 | * @op: policy operation being performed |
625 | * @gfp: memory allocation flags | |
fc1c9fd1 | 626 | * @nsname: name of the ns being manipulated (MAY BE NULL) |
c88d4c7b JJ |
627 | * @name: name of profile being manipulated (NOT NULL) |
628 | * @info: any extra information to be audited (MAYBE NULL) | |
629 | * @error: error code | |
630 | * | |
631 | * Returns: the error to be returned after audit is done | |
632 | */ | |
ef88a7ac | 633 | static int audit_policy(struct aa_profile *profile, const char *op, |
fc1c9fd1 JJ |
634 | const char *nsname, const char *name, |
635 | const char *info, int error) | |
c88d4c7b | 636 | { |
ef88a7ac JJ |
637 | DEFINE_AUDIT_DATA(sa, LSM_AUDIT_DATA_NONE, op); |
638 | ||
639 | aad(&sa)->iface.ns = nsname; | |
640 | aad(&sa)->name = name; | |
641 | aad(&sa)->info = info; | |
642 | aad(&sa)->error = error; | |
643 | ||
644 | return aa_audit(AUDIT_APPARMOR_STATUS, profile, &sa, audit_cb); | |
c88d4c7b JJ |
645 | } |
646 | ||
2bd8dbbf JJ |
647 | /** |
648 | * policy_view_capable - check if viewing policy in at @ns is allowed | |
649 | * ns: namespace being viewed by current task (may be NULL) | |
650 | * Returns: true if viewing policy is allowed | |
651 | * | |
652 | * If @ns is NULL then the namespace being viewed is assumed to be the | |
653 | * tasks current namespace. | |
654 | */ | |
655 | bool policy_view_capable(struct aa_ns *ns) | |
58acf9d9 JJ |
656 | { |
657 | struct user_namespace *user_ns = current_user_ns(); | |
2bd8dbbf JJ |
658 | struct aa_ns *view_ns = aa_get_current_ns(); |
659 | bool root_in_user_ns = uid_eq(current_euid(), make_kuid(user_ns, 0)) || | |
660 | in_egroup_p(make_kgid(user_ns, 0)); | |
58acf9d9 | 661 | bool response = false; |
2bd8dbbf JJ |
662 | if (!ns) |
663 | ns = view_ns; | |
58acf9d9 | 664 | |
2bd8dbbf JJ |
665 | if (root_in_user_ns && aa_ns_visible(view_ns, ns, true) && |
666 | (user_ns == &init_user_ns || | |
667 | (unprivileged_userns_apparmor_policy != 0 && | |
668 | user_ns->level == view_ns->level))) | |
58acf9d9 | 669 | response = true; |
2bd8dbbf | 670 | aa_put_ns(view_ns); |
58acf9d9 JJ |
671 | |
672 | return response; | |
673 | } | |
674 | ||
fd2a8043 | 675 | bool policy_admin_capable(struct aa_ns *ns) |
58acf9d9 | 676 | { |
fd2a8043 JJ |
677 | struct user_namespace *user_ns = current_user_ns(); |
678 | bool capable = ns_capable(user_ns, CAP_MAC_ADMIN); | |
679 | ||
680 | AA_DEBUG("cap_mac_admin? %d\n", capable); | |
681 | AA_DEBUG("policy locked? %d\n", aa_g_lock_policy); | |
682 | ||
683 | return policy_view_capable(ns) && capable && !aa_g_lock_policy; | |
58acf9d9 JJ |
684 | } |
685 | ||
c88d4c7b JJ |
686 | /** |
687 | * aa_may_manage_policy - can the current task manage policy | |
078c73c6 | 688 | * @profile: profile to check if it can manage policy |
c88d4c7b JJ |
689 | * @op: the policy manipulation operation being done |
690 | * | |
078c73c6 | 691 | * Returns: 0 if the task is allowed to manipulate policy else error |
c88d4c7b | 692 | */ |
18e99f19 | 693 | int aa_may_manage_policy(struct aa_profile *profile, struct aa_ns *ns, u32 mask) |
c88d4c7b | 694 | { |
18e99f19 JJ |
695 | const char *op; |
696 | ||
697 | if (mask & AA_MAY_REMOVE_POLICY) | |
698 | op = OP_PROF_RM; | |
699 | else if (mask & AA_MAY_REPLACE_POLICY) | |
700 | op = OP_PROF_REPL; | |
701 | else | |
702 | op = OP_PROF_LOAD; | |
703 | ||
c88d4c7b | 704 | /* check if loading policy is locked out */ |
078c73c6 | 705 | if (aa_g_lock_policy) |
18e99f19 JJ |
706 | return audit_policy(profile, op, NULL, NULL, "policy_locked", |
707 | -EACCES); | |
c88d4c7b | 708 | |
078c73c6 | 709 | if (!policy_admin_capable(ns)) |
18e99f19 JJ |
710 | return audit_policy(profile, op, NULL, NULL, "not policy admin", |
711 | -EACCES); | |
c88d4c7b | 712 | |
078c73c6 JJ |
713 | /* TODO: add fine grained mediation of policy loads */ |
714 | return 0; | |
c88d4c7b JJ |
715 | } |
716 | ||
dd51c848 JJ |
717 | static struct aa_profile *__list_lookup_parent(struct list_head *lh, |
718 | struct aa_profile *profile) | |
719 | { | |
6e474e30 | 720 | const char *base = basename(profile->base.hname); |
dd51c848 JJ |
721 | long len = base - profile->base.hname; |
722 | struct aa_load_ent *ent; | |
723 | ||
724 | /* parent won't have trailing // so remove from len */ | |
725 | if (len <= 2) | |
726 | return NULL; | |
727 | len -= 2; | |
728 | ||
729 | list_for_each_entry(ent, lh, list) { | |
730 | if (ent->new == profile) | |
731 | continue; | |
732 | if (strncmp(ent->new->base.hname, profile->base.hname, len) == | |
733 | 0 && ent->new->base.hname[len] == 0) | |
734 | return ent->new; | |
735 | } | |
736 | ||
737 | return NULL; | |
738 | } | |
739 | ||
740 | /** | |
741 | * __replace_profile - replace @old with @new on a list | |
742 | * @old: profile to be replaced (NOT NULL) | |
743 | * @new: profile to replace @old with (NOT NULL) | |
8399588a | 744 | * @share_proxy: transfer @old->proxy to @new |
dd51c848 JJ |
745 | * |
746 | * Will duplicate and refcount elements that @new inherits from @old | |
747 | * and will inherit @old children. | |
748 | * | |
749 | * refcount @new for list, put @old list refcount | |
750 | * | |
751 | * Requires: namespace list lock be held, or list not be shared | |
752 | */ | |
77b071b3 | 753 | static void __replace_profile(struct aa_profile *old, struct aa_profile *new, |
8399588a | 754 | bool share_proxy) |
dd51c848 JJ |
755 | { |
756 | struct aa_profile *child, *tmp; | |
757 | ||
758 | if (!list_empty(&old->base.profiles)) { | |
759 | LIST_HEAD(lh); | |
01e2b670 | 760 | list_splice_init_rcu(&old->base.profiles, &lh, synchronize_rcu); |
dd51c848 JJ |
761 | |
762 | list_for_each_entry_safe(child, tmp, &lh, base.list) { | |
763 | struct aa_profile *p; | |
764 | ||
765 | list_del_init(&child->base.list); | |
766 | p = __find_child(&new->base.profiles, child->base.name); | |
767 | if (p) { | |
768 | /* @p replaces @child */ | |
8399588a | 769 | __replace_profile(child, p, share_proxy); |
dd51c848 JJ |
770 | continue; |
771 | } | |
772 | ||
773 | /* inherit @child and its children */ | |
774 | /* TODO: update hname of inherited children */ | |
775 | /* list refcount transferred to @new */ | |
0d259f04 | 776 | p = aa_deref_parent(child); |
01e2b670 JJ |
777 | rcu_assign_pointer(child->parent, aa_get_profile(new)); |
778 | list_add_rcu(&child->base.list, &new->base.profiles); | |
779 | aa_put_profile(p); | |
dd51c848 JJ |
780 | } |
781 | } | |
782 | ||
01e2b670 | 783 | if (!rcu_access_pointer(new->parent)) { |
0d259f04 | 784 | struct aa_profile *parent = aa_deref_parent(old); |
01e2b670 JJ |
785 | rcu_assign_pointer(new->parent, aa_get_profile(parent)); |
786 | } | |
8399588a JJ |
787 | __aa_update_proxy(old, new); |
788 | if (share_proxy) { | |
789 | aa_put_proxy(new->proxy); | |
790 | new->proxy = aa_get_proxy(old->proxy); | |
791 | } else if (!rcu_access_pointer(new->proxy->profile)) | |
792 | /* aafs interface uses proxy */ | |
793 | rcu_assign_pointer(new->proxy->profile, | |
0d259f04 | 794 | aa_get_profile(new)); |
c97204ba | 795 | __aafs_profile_migrate_dents(old, new); |
dd51c848 JJ |
796 | |
797 | if (list_empty(&new->base.list)) { | |
798 | /* new is not on a list already */ | |
01e2b670 | 799 | list_replace_rcu(&old->base.list, &new->base.list); |
dd51c848 JJ |
800 | aa_get_profile(new); |
801 | aa_put_profile(old); | |
802 | } else | |
803 | __list_remove_profile(old); | |
804 | } | |
805 | ||
806 | /** | |
807 | * __lookup_replace - lookup replacement information for a profile | |
808 | * @ns - namespace the lookup occurs in | |
809 | * @hname - name of profile to lookup | |
810 | * @noreplace - true if not replacing an existing profile | |
811 | * @p - Returns: profile to be replaced | |
812 | * @info - Returns: info string on why lookup failed | |
813 | * | |
814 | * Returns: profile to replace (no ref) on success else ptr error | |
815 | */ | |
98849dff | 816 | static int __lookup_replace(struct aa_ns *ns, const char *hname, |
dd51c848 JJ |
817 | bool noreplace, struct aa_profile **p, |
818 | const char **info) | |
819 | { | |
820 | *p = aa_get_profile(__lookup_profile(&ns->base, hname)); | |
821 | if (*p) { | |
822 | int error = replacement_allowed(*p, noreplace, info); | |
823 | if (error) { | |
824 | *info = "profile can not be replaced"; | |
825 | return error; | |
826 | } | |
827 | } | |
828 | ||
829 | return 0; | |
830 | } | |
831 | ||
c88d4c7b JJ |
832 | /** |
833 | * aa_replace_profiles - replace profile(s) on the profile list | |
73688d1e | 834 | * @view: namespace load is viewed from |
12dd7171 | 835 | * @label: label that is attempting to load/replace policy |
18e99f19 | 836 | * @mask: permission mask |
5ac8c355 | 837 | * @udata: serialized data stream (NOT NULL) |
c88d4c7b JJ |
838 | * |
839 | * unpack and replace a profile on the profile list and uses of that profile | |
55a26ebf | 840 | * by any aa_task_ctx. If the profile does not exist on the profile list |
c88d4c7b JJ |
841 | * it is added. |
842 | * | |
843 | * Returns: size of data consumed else error code on failure. | |
844 | */ | |
12dd7171 | 845 | ssize_t aa_replace_profiles(struct aa_ns *view, struct aa_profile *profile, |
18e99f19 | 846 | u32 mask, struct aa_loaddata *udata) |
c88d4c7b | 847 | { |
bf15cf0c | 848 | const char *ns_name, *info = NULL; |
98849dff | 849 | struct aa_ns *ns = NULL; |
dd51c848 | 850 | struct aa_load_ent *ent, *tmp; |
5d5182ca | 851 | struct aa_loaddata *rawdata_ent; |
18e99f19 | 852 | const char *op; |
04dc715e | 853 | ssize_t count, error; |
dd51c848 | 854 | LIST_HEAD(lh); |
c88d4c7b | 855 | |
18e99f19 | 856 | op = mask & AA_MAY_REPLACE_POLICY ? OP_PROF_REPL : OP_PROF_LOAD; |
5d5182ca | 857 | aa_get_loaddata(udata); |
c88d4c7b | 858 | /* released below */ |
5ac8c355 | 859 | error = aa_unpack(udata, &lh, &ns_name); |
dd51c848 JJ |
860 | if (error) |
861 | goto out; | |
c88d4c7b | 862 | |
04dc715e JJ |
863 | /* ensure that profiles are all for the same ns |
864 | * TODO: update locking to remove this constaint. All profiles in | |
865 | * the load set must succeed as a set or the load will | |
866 | * fail. Sort ent list and take ns locks in hierarchy order | |
867 | */ | |
868 | count = 0; | |
869 | list_for_each_entry(ent, &lh, list) { | |
870 | if (ns_name) { | |
871 | if (ent->ns_name && | |
872 | strcmp(ent->ns_name, ns_name) != 0) { | |
873 | info = "policy load has mixed namespaces"; | |
874 | error = -EACCES; | |
875 | goto fail; | |
876 | } | |
877 | } else if (ent->ns_name) { | |
878 | if (count) { | |
879 | info = "policy load has mixed namespaces"; | |
880 | error = -EACCES; | |
881 | goto fail; | |
882 | } | |
883 | ns_name = ent->ns_name; | |
884 | } else | |
885 | count++; | |
c88d4c7b | 886 | } |
04dc715e JJ |
887 | if (ns_name) { |
888 | ns = aa_prepare_ns(view, ns_name); | |
889 | if (IS_ERR(ns)) { | |
b9b144bc | 890 | op = OP_PROF_LOAD; |
04dc715e JJ |
891 | info = "failed to prepare namespace"; |
892 | error = PTR_ERR(ns); | |
893 | ns = NULL; | |
b9b144bc | 894 | ent = NULL; |
04dc715e JJ |
895 | goto fail; |
896 | } | |
897 | } else | |
898 | ns = aa_get_ns(view); | |
c88d4c7b | 899 | |
01e2b670 | 900 | mutex_lock(&ns->lock); |
5d5182ca JJ |
901 | /* check for duplicate rawdata blobs: space and file dedup */ |
902 | list_for_each_entry(rawdata_ent, &ns->rawdata_list, list) { | |
903 | if (aa_rawdata_eq(rawdata_ent, udata)) { | |
904 | struct aa_loaddata *tmp; | |
905 | ||
906 | tmp = __aa_get_loaddata(rawdata_ent); | |
907 | /* check we didn't fail the race */ | |
908 | if (tmp) { | |
909 | aa_put_loaddata(udata); | |
910 | udata = tmp; | |
911 | break; | |
912 | } | |
913 | } | |
914 | } | |
dd51c848 JJ |
915 | /* setup parent and ns info */ |
916 | list_for_each_entry(ent, &lh, list) { | |
917 | struct aa_policy *policy; | |
5d5182ca | 918 | |
5ac8c355 | 919 | ent->new->rawdata = aa_get_loaddata(udata); |
18e99f19 JJ |
920 | error = __lookup_replace(ns, ent->new->base.hname, |
921 | !(mask & AA_MAY_REPLACE_POLICY), | |
dd51c848 JJ |
922 | &ent->old, &info); |
923 | if (error) | |
924 | goto fail_lock; | |
925 | ||
926 | if (ent->new->rename) { | |
927 | error = __lookup_replace(ns, ent->new->rename, | |
18e99f19 JJ |
928 | !(mask & AA_MAY_REPLACE_POLICY), |
929 | &ent->rename, &info); | |
dd51c848 JJ |
930 | if (error) |
931 | goto fail_lock; | |
c88d4c7b | 932 | } |
c88d4c7b | 933 | |
dd51c848 | 934 | /* released when @new is freed */ |
98849dff | 935 | ent->new->ns = aa_get_ns(ns); |
dd51c848 JJ |
936 | |
937 | if (ent->old || ent->rename) | |
938 | continue; | |
939 | ||
940 | /* no ref on policy only use inside lock */ | |
941 | policy = __lookup_parent(ns, ent->new->base.hname); | |
942 | if (!policy) { | |
943 | struct aa_profile *p; | |
944 | p = __list_lookup_parent(&lh, ent->new); | |
945 | if (!p) { | |
946 | error = -ENOENT; | |
947 | info = "parent does not exist"; | |
dd51c848 JJ |
948 | goto fail_lock; |
949 | } | |
01e2b670 JJ |
950 | rcu_assign_pointer(ent->new->parent, aa_get_profile(p)); |
951 | } else if (policy != &ns->base) { | |
dd51c848 | 952 | /* released on profile replacement or free_profile */ |
01e2b670 JJ |
953 | struct aa_profile *p = (struct aa_profile *) policy; |
954 | rcu_assign_pointer(ent->new->parent, aa_get_profile(p)); | |
955 | } | |
dd51c848 | 956 | } |
c88d4c7b | 957 | |
0d259f04 | 958 | /* create new fs entries for introspection if needed */ |
5d5182ca JJ |
959 | if (!udata->dents[AAFS_LOADDATA_DIR]) { |
960 | error = __aa_fs_create_rawdata(ns, udata); | |
961 | if (error) { | |
962 | info = "failed to create raw_data dir and files"; | |
963 | ent = NULL; | |
964 | goto fail_lock; | |
965 | } | |
966 | } | |
0d259f04 JJ |
967 | list_for_each_entry(ent, &lh, list) { |
968 | if (ent->old) { | |
969 | /* inherit old interface files */ | |
970 | ||
971 | /* if (ent->rename) | |
972 | TODO: support rename */ | |
973 | /* } else if (ent->rename) { | |
974 | TODO: support rename */ | |
975 | } else { | |
976 | struct dentry *parent; | |
977 | if (rcu_access_pointer(ent->new->parent)) { | |
978 | struct aa_profile *p; | |
979 | p = aa_deref_parent(ent->new); | |
980 | parent = prof_child_dir(p); | |
981 | } else | |
982 | parent = ns_subprofs_dir(ent->new->ns); | |
c97204ba | 983 | error = __aafs_profile_mkdir(ent->new, parent); |
0d259f04 JJ |
984 | } |
985 | ||
986 | if (error) { | |
987 | info = "failed to create "; | |
988 | goto fail_lock; | |
989 | } | |
990 | } | |
991 | ||
992 | /* Done with checks that may fail - do actual replacement */ | |
5d5182ca JJ |
993 | __aa_bump_ns_revision(ns); |
994 | __aa_loaddata_update(udata, ns->revision); | |
dd51c848 JJ |
995 | list_for_each_entry_safe(ent, tmp, &lh, list) { |
996 | list_del_init(&ent->list); | |
997 | op = (!ent->old && !ent->rename) ? OP_PROF_LOAD : OP_PROF_REPL; | |
998 | ||
5d5182ca JJ |
999 | if (ent->old && ent->old->rawdata == ent->new->rawdata) { |
1000 | /* dedup actual profile replacement */ | |
1001 | audit_policy(profile, op, ns_name, ent->new->base.hname, | |
1002 | "same as current profile, skipping", | |
1003 | error); | |
1004 | goto skip; | |
1005 | } | |
1006 | ||
1007 | /* | |
1008 | * TODO: finer dedup based on profile range in data. Load set | |
1009 | * can differ but profile may remain unchanged | |
1010 | */ | |
ef88a7ac JJ |
1011 | audit_policy(profile, op, NULL, ent->new->base.hname, |
1012 | NULL, error); | |
dd51c848 JJ |
1013 | |
1014 | if (ent->old) { | |
77b071b3 | 1015 | __replace_profile(ent->old, ent->new, 1); |
0d259f04 | 1016 | if (ent->rename) { |
8399588a JJ |
1017 | /* aafs interface uses proxy */ |
1018 | struct aa_proxy *r = ent->new->proxy; | |
0d259f04 JJ |
1019 | rcu_assign_pointer(r->profile, |
1020 | aa_get_profile(ent->new)); | |
77b071b3 | 1021 | __replace_profile(ent->rename, ent->new, 0); |
0d259f04 | 1022 | } |
dd51c848 | 1023 | } else if (ent->rename) { |
8399588a JJ |
1024 | /* aafs interface uses proxy */ |
1025 | rcu_assign_pointer(ent->new->proxy->profile, | |
0d259f04 | 1026 | aa_get_profile(ent->new)); |
77b071b3 | 1027 | __replace_profile(ent->rename, ent->new, 0); |
dd51c848 | 1028 | } else if (ent->new->parent) { |
01e2b670 | 1029 | struct aa_profile *parent, *newest; |
0d259f04 | 1030 | parent = aa_deref_parent(ent->new); |
77b071b3 | 1031 | newest = aa_get_newest_profile(parent); |
01e2b670 | 1032 | |
dd51c848 | 1033 | /* parent replaced in this atomic set? */ |
01e2b670 JJ |
1034 | if (newest != parent) { |
1035 | aa_get_profile(newest); | |
01e2b670 | 1036 | rcu_assign_pointer(ent->new->parent, newest); |
f351841f | 1037 | aa_put_profile(parent); |
dcda617a | 1038 | } |
8399588a JJ |
1039 | /* aafs interface uses proxy */ |
1040 | rcu_assign_pointer(ent->new->proxy->profile, | |
0d259f04 | 1041 | aa_get_profile(ent->new)); |
ec34fa24 | 1042 | __list_add_profile(&newest->base.profiles, ent->new); |
dcda617a | 1043 | aa_put_profile(newest); |
0d259f04 | 1044 | } else { |
8399588a JJ |
1045 | /* aafs interface uses proxy */ |
1046 | rcu_assign_pointer(ent->new->proxy->profile, | |
0d259f04 | 1047 | aa_get_profile(ent->new)); |
dd51c848 | 1048 | __list_add_profile(&ns->base.profiles, ent->new); |
0d259f04 | 1049 | } |
5d5182ca | 1050 | skip: |
dd51c848 | 1051 | aa_load_ent_free(ent); |
c88d4c7b | 1052 | } |
01e2b670 | 1053 | mutex_unlock(&ns->lock); |
c88d4c7b JJ |
1054 | |
1055 | out: | |
98849dff | 1056 | aa_put_ns(ns); |
5d5182ca | 1057 | aa_put_loaddata(udata); |
dd51c848 | 1058 | |
c88d4c7b JJ |
1059 | if (error) |
1060 | return error; | |
5ac8c355 | 1061 | return udata->size; |
c88d4c7b | 1062 | |
dd51c848 | 1063 | fail_lock: |
01e2b670 | 1064 | mutex_unlock(&ns->lock); |
dd51c848 | 1065 | |
bf15cf0c | 1066 | /* audit cause of failure */ |
5d5182ca | 1067 | op = (ent && !ent->old) ? OP_PROF_LOAD : OP_PROF_REPL; |
04dc715e | 1068 | fail: |
b9b144bc | 1069 | audit_policy(profile, op, ns_name, ent ? ent->new->base.hname : NULL, |
12dd7171 | 1070 | info, error); |
bf15cf0c JJ |
1071 | /* audit status that rest of profiles in the atomic set failed too */ |
1072 | info = "valid profile in failed atomic policy load"; | |
1073 | list_for_each_entry(tmp, &lh, list) { | |
1074 | if (tmp == ent) { | |
1075 | info = "unchecked profile in failed atomic policy load"; | |
1076 | /* skip entry that caused failure */ | |
1077 | continue; | |
1078 | } | |
b9b144bc | 1079 | op = (!tmp->old) ? OP_PROF_LOAD : OP_PROF_REPL; |
ef88a7ac | 1080 | audit_policy(profile, op, ns_name, |
a6f23300 | 1081 | tmp->new->base.hname, info, error); |
bf15cf0c | 1082 | } |
dd51c848 JJ |
1083 | list_for_each_entry_safe(ent, tmp, &lh, list) { |
1084 | list_del_init(&ent->list); | |
1085 | aa_load_ent_free(ent); | |
1086 | } | |
1087 | ||
c88d4c7b JJ |
1088 | goto out; |
1089 | } | |
1090 | ||
1091 | /** | |
1092 | * aa_remove_profiles - remove profile(s) from the system | |
b79473f2 | 1093 | * @view: namespace the remove is being done from |
12dd7171 | 1094 | * @subj: profile attempting to remove policy |
c88d4c7b JJ |
1095 | * @fqname: name of the profile or namespace to remove (NOT NULL) |
1096 | * @size: size of the name | |
1097 | * | |
1098 | * Remove a profile or sub namespace from the current namespace, so that | |
1099 | * they can not be found anymore and mark them as replaced by unconfined | |
1100 | * | |
1101 | * NOTE: removing confinement does not restore rlimits to preconfinemnet values | |
1102 | * | |
1103 | * Returns: size of data consume else error code if fails | |
1104 | */ | |
12dd7171 JJ |
1105 | ssize_t aa_remove_profiles(struct aa_ns *view, struct aa_profile *subj, |
1106 | char *fqname, size_t size) | |
c88d4c7b | 1107 | { |
b79473f2 | 1108 | struct aa_ns *root = NULL, *ns = NULL; |
c88d4c7b JJ |
1109 | struct aa_profile *profile = NULL; |
1110 | const char *name = fqname, *info = NULL; | |
04dc715e | 1111 | char *ns_name = NULL; |
c88d4c7b JJ |
1112 | ssize_t error = 0; |
1113 | ||
1114 | if (*fqname == 0) { | |
1115 | info = "no profile specified"; | |
1116 | error = -ENOENT; | |
1117 | goto fail; | |
1118 | } | |
1119 | ||
b79473f2 | 1120 | root = view; |
c88d4c7b JJ |
1121 | |
1122 | if (fqname[0] == ':') { | |
c88d4c7b | 1123 | name = aa_split_fqname(fqname, &ns_name); |
41d1b3e8 | 1124 | /* released below */ |
98849dff | 1125 | ns = aa_find_ns(root, ns_name); |
41d1b3e8 JJ |
1126 | if (!ns) { |
1127 | info = "namespace does not exist"; | |
1128 | error = -ENOENT; | |
1129 | goto fail; | |
c88d4c7b JJ |
1130 | } |
1131 | } else | |
1132 | /* released below */ | |
98849dff | 1133 | ns = aa_get_ns(root); |
c88d4c7b | 1134 | |
c88d4c7b JJ |
1135 | if (!name) { |
1136 | /* remove namespace - can only happen if fqname[0] == ':' */ | |
01e2b670 | 1137 | mutex_lock(&ns->parent->lock); |
98849dff | 1138 | __aa_remove_ns(ns); |
5d5182ca | 1139 | __aa_bump_ns_revision(ns); |
01e2b670 | 1140 | mutex_unlock(&ns->parent->lock); |
c88d4c7b JJ |
1141 | } else { |
1142 | /* remove profile */ | |
01e2b670 | 1143 | mutex_lock(&ns->lock); |
c88d4c7b JJ |
1144 | profile = aa_get_profile(__lookup_profile(&ns->base, name)); |
1145 | if (!profile) { | |
1146 | error = -ENOENT; | |
1147 | info = "profile does not exist"; | |
1148 | goto fail_ns_lock; | |
1149 | } | |
1150 | name = profile->base.hname; | |
1151 | __remove_profile(profile); | |
5d5182ca | 1152 | __aa_bump_ns_revision(ns); |
01e2b670 | 1153 | mutex_unlock(&ns->lock); |
c88d4c7b | 1154 | } |
c88d4c7b JJ |
1155 | |
1156 | /* don't fail removal if audit fails */ | |
ef88a7ac | 1157 | (void) audit_policy(subj, OP_PROF_RM, ns_name, name, info, |
12dd7171 | 1158 | error); |
98849dff | 1159 | aa_put_ns(ns); |
c88d4c7b JJ |
1160 | aa_put_profile(profile); |
1161 | return size; | |
1162 | ||
1163 | fail_ns_lock: | |
01e2b670 | 1164 | mutex_unlock(&ns->lock); |
98849dff | 1165 | aa_put_ns(ns); |
c88d4c7b JJ |
1166 | |
1167 | fail: | |
ef88a7ac | 1168 | (void) audit_policy(subj, OP_PROF_RM, ns_name, name, info, |
12dd7171 | 1169 | error); |
c88d4c7b JJ |
1170 | return error; |
1171 | } |