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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> | |
80594fc2 | 79 | #include <linux/user_namespace.h> |
c88d4c7b JJ |
80 | |
81 | #include "include/apparmor.h" | |
82 | #include "include/capability.h" | |
83 | #include "include/context.h" | |
84 | #include "include/file.h" | |
85 | #include "include/ipc.h" | |
80594fc2 | 86 | #include "include/label.h" |
c88d4c7b JJ |
87 | #include "include/match.h" |
88 | #include "include/path.h" | |
89 | #include "include/policy.h" | |
0acae0c2 | 90 | #include "include/policy_ns.h" |
c88d4c7b JJ |
91 | #include "include/policy_unpack.h" |
92 | #include "include/resource.h" | |
c88d4c7b | 93 | |
8350b3dc | 94 | int unprivileged_userns_apparmor_policy = 1; |
c88d4c7b | 95 | |
80594fc2 JJ |
96 | /* Note: mode names must be unique in the first character because of |
97 | * modechrs used to print modes on compound labels on some interfaces | |
98 | */ | |
0d259f04 | 99 | const char *const aa_profile_mode_names[] = { |
c88d4c7b JJ |
100 | "enforce", |
101 | "complain", | |
102 | "kill", | |
03816507 | 103 | "unconfined", |
c88d4c7b JJ |
104 | }; |
105 | ||
b7370901 WH |
106 | /** |
107 | * aa_free_data - free a data blob | |
108 | * @ptr: data to free | |
109 | * @arg: unused | |
110 | */ | |
111 | static void aa_free_data(void *ptr, void *arg) | |
112 | { | |
113 | struct aa_data *data = ptr; | |
114 | ||
115 | kzfree(data->data); | |
116 | kzfree(data->key); | |
117 | kzfree(data); | |
118 | } | |
c88d4c7b JJ |
119 | |
120 | /** | |
80594fc2 | 121 | * __add_profile - add a profiles to list and label tree |
c88d4c7b JJ |
122 | * @list: list to add it to (NOT NULL) |
123 | * @profile: the profile to add (NOT NULL) | |
124 | * | |
125 | * refcount @profile, should be put by __list_remove_profile | |
126 | * | |
127 | * Requires: namespace lock be held, or list not be shared | |
128 | */ | |
80594fc2 | 129 | static void __add_profile(struct list_head *list, struct aa_profile *profile) |
c88d4c7b | 130 | { |
80594fc2 JJ |
131 | struct aa_label *l; |
132 | ||
133 | AA_BUG(!list); | |
134 | AA_BUG(!profile); | |
135 | AA_BUG(!profile->ns); | |
136 | AA_BUG(!mutex_is_locked(&profile->ns->lock)); | |
137 | ||
01e2b670 | 138 | list_add_rcu(&profile->base.list, list); |
c88d4c7b JJ |
139 | /* get list reference */ |
140 | aa_get_profile(profile); | |
80594fc2 JJ |
141 | l = aa_label_insert(&profile->ns->labels, &profile->label); |
142 | AA_BUG(l != &profile->label); | |
143 | aa_put_label(l); | |
c88d4c7b JJ |
144 | } |
145 | ||
146 | /** | |
147 | * __list_remove_profile - remove a profile from the list it is on | |
148 | * @profile: the profile to remove (NOT NULL) | |
149 | * | |
150 | * remove a profile from the list, warning generally removal should | |
151 | * be done with __replace_profile as most profile removals are | |
152 | * replacements to the unconfined profile. | |
153 | * | |
154 | * put @profile list refcount | |
155 | * | |
156 | * Requires: namespace lock be held, or list not have been live | |
157 | */ | |
158 | static void __list_remove_profile(struct aa_profile *profile) | |
159 | { | |
80594fc2 JJ |
160 | AA_BUG(!profile); |
161 | AA_BUG(!profile->ns); | |
162 | AA_BUG(!mutex_is_locked(&profile->ns->lock)); | |
163 | ||
01e2b670 JJ |
164 | list_del_rcu(&profile->base.list); |
165 | aa_put_profile(profile); | |
c88d4c7b JJ |
166 | } |
167 | ||
80594fc2 | 168 | void __aa_profile_list_release(struct list_head *head); |
c88d4c7b JJ |
169 | |
170 | /** | |
171 | * __remove_profile - remove old profile, and children | |
172 | * @profile: profile to be replaced (NOT NULL) | |
173 | * | |
174 | * Requires: namespace list lock be held, or list not be shared | |
175 | */ | |
176 | static void __remove_profile(struct aa_profile *profile) | |
177 | { | |
80594fc2 JJ |
178 | AA_BUG(!profile); |
179 | AA_BUG(!profile->ns); | |
180 | AA_BUG(!mutex_is_locked(&profile->ns->lock)); | |
181 | ||
c88d4c7b | 182 | /* release any children lists first */ |
80594fc2 | 183 | __aa_profile_list_release(&profile->base.profiles); |
c88d4c7b | 184 | /* released by free_profile */ |
80594fc2 | 185 | aa_label_remove(&profile->label); |
0d259f04 | 186 | __aa_fs_profile_rmdir(profile); |
c88d4c7b JJ |
187 | __list_remove_profile(profile); |
188 | } | |
189 | ||
190 | /** | |
80594fc2 | 191 | * __aa_profile_list_release - remove all profiles on the list and put refs |
c88d4c7b JJ |
192 | * @head: list of profiles (NOT NULL) |
193 | * | |
194 | * Requires: namespace lock be held | |
195 | */ | |
80594fc2 | 196 | void __aa_profile_list_release(struct list_head *head) |
c88d4c7b JJ |
197 | { |
198 | struct aa_profile *profile, *tmp; | |
199 | list_for_each_entry_safe(profile, tmp, head, base.list) | |
200 | __remove_profile(profile); | |
201 | } | |
202 | ||
77b071b3 | 203 | |
c88d4c7b | 204 | /** |
8651e1d6 | 205 | * aa_free_profile - free a profile |
c88d4c7b JJ |
206 | * @profile: the profile to free (MAYBE NULL) |
207 | * | |
208 | * Free a profile, its hats and null_profile. All references to the profile, | |
209 | * its hats and null_profile must have been put. | |
210 | * | |
211 | * If the profile was referenced from a task context, free_profile() will | |
212 | * be called from an rcu callback routine, so we must not sleep here. | |
213 | */ | |
8651e1d6 | 214 | void aa_free_profile(struct aa_profile *profile) |
c88d4c7b | 215 | { |
b7370901 WH |
216 | struct rhashtable *rht; |
217 | ||
c88d4c7b JJ |
218 | AA_DEBUG("%s(%p)\n", __func__, profile); |
219 | ||
220 | if (!profile) | |
221 | return; | |
222 | ||
c88d4c7b | 223 | /* free children profiles */ |
80594fc2 | 224 | aa_policy_destroy(&profile->base); |
01e2b670 | 225 | aa_put_profile(rcu_access_pointer(profile->parent)); |
c88d4c7b | 226 | |
80594fc2 | 227 | aa_put_ns(profile->ns); |
c88d4c7b JJ |
228 | kzfree(profile->rename); |
229 | ||
230 | aa_free_file_rules(&profile->file); | |
231 | aa_free_cap_rules(&profile->caps); | |
80594fc2 | 232 | aa_free_net_rules(&profile->net); |
c88d4c7b JJ |
233 | aa_free_rlimit_rules(&profile->rlimits); |
234 | ||
0d259f04 | 235 | kzfree(profile->dirname); |
c88d4c7b | 236 | aa_put_dfa(profile->xmatch); |
ad5ff3db | 237 | aa_put_dfa(profile->policy.dfa); |
c88d4c7b | 238 | |
b7370901 WH |
239 | if (profile->data) { |
240 | rht = profile->data; | |
241 | profile->data = NULL; | |
242 | rhashtable_free_and_destroy(rht, aa_free_data, NULL); | |
243 | kzfree(rht); | |
244 | } | |
245 | ||
5cb3e91e | 246 | kzfree(profile->hash); |
3b8ad847 JJ |
247 | aa_put_loaddata(profile->rawdata); |
248 | ||
c88d4c7b JJ |
249 | kzfree(profile); |
250 | } | |
251 | ||
4da05cc0 JJ |
252 | /** |
253 | * aa_alloc_profile - allocate, initialize and return a new profile | |
254 | * @hname: name of the profile (NOT NULL) | |
80594fc2 | 255 | * @gfp: allocation type |
4da05cc0 JJ |
256 | * |
257 | * Returns: refcount profile or NULL on failure | |
258 | */ | |
80594fc2 JJ |
259 | struct aa_profile *aa_alloc_profile(const char *hname, struct aa_proxy *proxy, |
260 | gfp_t gfp) | |
4da05cc0 JJ |
261 | { |
262 | struct aa_profile *profile; | |
263 | ||
264 | /* freed by free_profile - usually through aa_put_profile */ | |
80594fc2 JJ |
265 | profile = kzalloc(sizeof(*profile) + sizeof (struct aa_profile *) * 2, |
266 | gfp); | |
4da05cc0 JJ |
267 | if (!profile) |
268 | return NULL; | |
269 | ||
80594fc2 | 270 | if (!aa_policy_init(&profile->base, NULL, hname, gfp)) |
77b071b3 | 271 | goto fail; |
80594fc2 | 272 | if (!aa_label_init(&profile->label, 1)) |
77b071b3 | 273 | goto fail; |
80594fc2 JJ |
274 | |
275 | /* update being set needed by fs interface */ | |
276 | if (!proxy) { | |
277 | proxy = aa_alloc_proxy(&profile->label, gfp); | |
278 | if (!proxy) | |
279 | goto fail; | |
280 | } else | |
281 | aa_get_proxy(proxy); | |
282 | profile->label.proxy = proxy; | |
283 | ||
284 | profile->label.hname = profile->base.hname; | |
285 | profile->label.flags |= FLAG_PROFILE; | |
286 | profile->label.vec[0] = profile; | |
4da05cc0 JJ |
287 | |
288 | /* refcount released by caller */ | |
289 | return profile; | |
77b071b3 JJ |
290 | |
291 | fail: | |
80594fc2 | 292 | aa_free_profile(profile); |
77b071b3 JJ |
293 | |
294 | return NULL; | |
4da05cc0 JJ |
295 | } |
296 | ||
297 | /** | |
80594fc2 | 298 | * aa_null_profile - create or find a null-X learning profile |
4da05cc0 JJ |
299 | * @parent: profile that caused this profile to be created (NOT NULL) |
300 | * @hat: true if the null- learning profile is a hat | |
80594fc2 JJ |
301 | * @base: name to base the null profile off of |
302 | * @gfp: type of allocation | |
4da05cc0 | 303 | * |
80594fc2 JJ |
304 | * Find/Create a null- complain mode profile used in learning mode. The |
305 | * name of the profile is unique and follows the format of parent//null-XXX. | |
306 | * where XXX is based on the @name or if that fails or is not supplied | |
307 | * a unique number | |
4da05cc0 JJ |
308 | * |
309 | * null profiles are added to the profile list but the list does not | |
310 | * hold a count on them so that they are automatically released when | |
311 | * not in use. | |
312 | * | |
313 | * Returns: new refcounted profile else NULL on failure | |
314 | */ | |
80594fc2 JJ |
315 | struct aa_profile *aa_null_profile(struct aa_profile *parent, bool hat, |
316 | const char *base, gfp_t gfp) | |
4da05cc0 | 317 | { |
80594fc2 | 318 | struct aa_profile *profile; |
4da05cc0 | 319 | char *name; |
4da05cc0 | 320 | |
80594fc2 JJ |
321 | AA_BUG(!parent); |
322 | ||
323 | if (base) { | |
324 | name = kmalloc(strlen(parent->base.hname) + 8 + strlen(base), | |
325 | gfp); | |
326 | if (name) { | |
327 | sprintf(name, "%s//null-%s", parent->base.hname, base); | |
328 | goto name; | |
329 | } | |
330 | /* fall through to try shorter uniq */ | |
331 | } | |
332 | ||
333 | name = kmalloc(strlen(parent->base.hname) + 2 + 7 + 8, gfp); | |
4da05cc0 | 334 | if (!name) |
80594fc2 JJ |
335 | return NULL; |
336 | sprintf(name, "%s//null-%x", parent->base.hname, | |
337 | atomic_inc_return(&parent->ns->uniq_null)); | |
4da05cc0 | 338 | |
80594fc2 JJ |
339 | name: |
340 | /* lookup to see if this is a dup creation */ | |
341 | profile = aa_find_child(parent, basename(name)); | |
342 | if (profile) | |
343 | goto out; | |
344 | ||
345 | profile = aa_alloc_profile(name, NULL, gfp); | |
4da05cc0 JJ |
346 | if (!profile) |
347 | goto fail; | |
348 | ||
349 | profile->mode = APPARMOR_COMPLAIN; | |
80594fc2 | 350 | profile->label.flags |= FLAG_NULL; |
4da05cc0 | 351 | if (hat) |
80594fc2 | 352 | profile->label.flags |= FLAG_HAT; |
c0b46bf1 | 353 | profile->path_flags = parent->path_flags; |
4da05cc0 JJ |
354 | |
355 | /* released on free_profile */ | |
01e2b670 | 356 | rcu_assign_pointer(profile->parent, aa_get_profile(parent)); |
80594fc2 JJ |
357 | profile->ns = aa_get_ns(parent->ns); |
358 | profile->file.dfa = aa_get_dfa(nulldfa); | |
359 | profile->policy.dfa = aa_get_dfa(nulldfa); | |
4da05cc0 | 360 | |
01e2b670 | 361 | mutex_lock(&profile->ns->lock); |
80594fc2 | 362 | __add_profile(&parent->base.profiles, profile); |
01e2b670 | 363 | mutex_unlock(&profile->ns->lock); |
4da05cc0 JJ |
364 | |
365 | /* refcount released by caller */ | |
80594fc2 JJ |
366 | out: |
367 | kfree(name); | |
4da05cc0 JJ |
368 | return profile; |
369 | ||
370 | fail: | |
80594fc2 | 371 | aa_free_profile(profile); |
4da05cc0 JJ |
372 | return NULL; |
373 | } | |
374 | ||
80594fc2 JJ |
375 | /** |
376 | * aa_setup_default_label - create the initial default label | |
377 | */ | |
378 | struct aa_label *aa_setup_default_label(void) | |
379 | { | |
380 | struct aa_profile *profile = aa_alloc_profile("default", NULL, | |
381 | GFP_KERNEL); | |
382 | if (!profile) | |
383 | return NULL; | |
384 | ||
385 | /* the default profile pretends to be unconfined until it is replaced */ | |
386 | profile->label.flags |= FLAG_IX_ON_NAME_ERROR | FLAG_UNCONFINED; | |
387 | profile->mode = APPARMOR_UNCONFINED; | |
388 | ||
389 | profile->ns = aa_get_ns(root_ns); | |
390 | ||
391 | __add_profile(&root_ns->base.profiles, profile); | |
392 | ||
393 | return &profile->label; | |
394 | } | |
395 | ||
c88d4c7b JJ |
396 | /* TODO: profile accounting - setup in remove */ |
397 | ||
398 | /** | |
399 | * __find_child - find a profile on @head list with a name matching @name | |
400 | * @head: list to search (NOT NULL) | |
401 | * @name: name of profile (NOT NULL) | |
402 | * | |
01e2b670 | 403 | * Requires: rcu_read_lock be held |
c88d4c7b JJ |
404 | * |
405 | * Returns: unrefcounted profile ptr, or NULL if not found | |
406 | */ | |
407 | static struct aa_profile *__find_child(struct list_head *head, const char *name) | |
408 | { | |
409 | return (struct aa_profile *)__policy_find(head, name); | |
410 | } | |
411 | ||
412 | /** | |
413 | * __strn_find_child - find a profile on @head list using substring of @name | |
414 | * @head: list to search (NOT NULL) | |
415 | * @name: name of profile (NOT NULL) | |
416 | * @len: length of @name substring to match | |
417 | * | |
01e2b670 | 418 | * Requires: rcu_read_lock be held |
c88d4c7b JJ |
419 | * |
420 | * Returns: unrefcounted profile ptr, or NULL if not found | |
421 | */ | |
422 | static struct aa_profile *__strn_find_child(struct list_head *head, | |
423 | const char *name, int len) | |
424 | { | |
425 | return (struct aa_profile *)__policy_strn_find(head, name, len); | |
426 | } | |
427 | ||
428 | /** | |
429 | * aa_find_child - find a profile by @name in @parent | |
430 | * @parent: profile to search (NOT NULL) | |
431 | * @name: profile name to search for (NOT NULL) | |
432 | * | |
433 | * Returns: a refcounted profile or NULL if not found | |
434 | */ | |
435 | struct aa_profile *aa_find_child(struct aa_profile *parent, const char *name) | |
436 | { | |
437 | struct aa_profile *profile; | |
438 | ||
01e2b670 | 439 | rcu_read_lock(); |
de7c4cc9 JJ |
440 | do { |
441 | profile = __find_child(&parent->base.profiles, name); | |
442 | } while (profile && !aa_get_profile_not0(profile)); | |
01e2b670 | 443 | rcu_read_unlock(); |
c88d4c7b JJ |
444 | |
445 | /* refcount released by caller */ | |
446 | return profile; | |
447 | } | |
448 | ||
449 | /** | |
450 | * __lookup_parent - lookup the parent of a profile of name @hname | |
451 | * @ns: namespace to lookup profile in (NOT NULL) | |
452 | * @hname: hierarchical profile name to find parent of (NOT NULL) | |
453 | * | |
454 | * Lookups up the parent of a fully qualified profile name, the profile | |
455 | * that matches hname does not need to exist, in general this | |
456 | * is used to load a new profile. | |
457 | * | |
01e2b670 | 458 | * Requires: rcu_read_lock be held |
c88d4c7b JJ |
459 | * |
460 | * Returns: unrefcounted policy or NULL if not found | |
461 | */ | |
80594fc2 | 462 | static struct aa_policy *__lookup_parent(struct aa_ns *ns, const char *hname) |
c88d4c7b JJ |
463 | { |
464 | struct aa_policy *policy; | |
465 | struct aa_profile *profile = NULL; | |
466 | char *split; | |
467 | ||
468 | policy = &ns->base; | |
469 | ||
470 | for (split = strstr(hname, "//"); split;) { | |
471 | profile = __strn_find_child(&policy->profiles, hname, | |
472 | split - hname); | |
473 | if (!profile) | |
474 | return NULL; | |
475 | policy = &profile->base; | |
476 | hname = split + 2; | |
477 | split = strstr(hname, "//"); | |
478 | } | |
479 | if (!profile) | |
480 | return &ns->base; | |
481 | return &profile->base; | |
482 | } | |
483 | ||
484 | /** | |
80594fc2 | 485 | * __lookupn_profile - lookup the profile matching @hname |
c88d4c7b JJ |
486 | * @base: base list to start looking up profile name from (NOT NULL) |
487 | * @hname: hierarchical profile name (NOT NULL) | |
80594fc2 | 488 | * @n: length of @hname |
c88d4c7b | 489 | * |
01e2b670 | 490 | * Requires: rcu_read_lock be held |
c88d4c7b JJ |
491 | * |
492 | * Returns: unrefcounted profile pointer or NULL if not found | |
493 | * | |
494 | * Do a relative name lookup, recursing through profile tree. | |
495 | */ | |
80594fc2 JJ |
496 | static struct aa_profile *__lookupn_profile(struct aa_policy *base, |
497 | const char *hname, size_t n) | |
c88d4c7b JJ |
498 | { |
499 | struct aa_profile *profile = NULL; | |
80594fc2 | 500 | const char *split; |
c88d4c7b | 501 | |
80594fc2 JJ |
502 | for (split = strnstr(hname, "//", n); split; |
503 | split = strnstr(hname, "//", n)) { | |
c88d4c7b JJ |
504 | profile = __strn_find_child(&base->profiles, hname, |
505 | split - hname); | |
506 | if (!profile) | |
507 | return NULL; | |
508 | ||
509 | base = &profile->base; | |
80594fc2 | 510 | n -= split + 2 - hname; |
c88d4c7b | 511 | hname = split + 2; |
c88d4c7b JJ |
512 | } |
513 | ||
80594fc2 JJ |
514 | if (n) |
515 | return __strn_find_child(&base->profiles, hname, n); | |
516 | return NULL; | |
517 | } | |
c88d4c7b | 518 | |
80594fc2 JJ |
519 | static struct aa_profile *__lookup_profile(struct aa_policy *base, |
520 | const char *hname) | |
521 | { | |
522 | return __lookupn_profile(base, hname, strlen(hname)); | |
c88d4c7b JJ |
523 | } |
524 | ||
525 | /** | |
526 | * aa_lookup_profile - find a profile by its full or partial name | |
527 | * @ns: the namespace to start from (NOT NULL) | |
528 | * @hname: name to do lookup on. Does not contain namespace prefix (NOT NULL) | |
80594fc2 | 529 | * @n: size of @hname |
c88d4c7b JJ |
530 | * |
531 | * Returns: refcounted profile or NULL if not found | |
532 | */ | |
80594fc2 JJ |
533 | struct aa_profile *aa_lookupn_profile(struct aa_ns *ns, const char *hname, |
534 | size_t n) | |
c88d4c7b JJ |
535 | { |
536 | struct aa_profile *profile; | |
537 | ||
01e2b670 JJ |
538 | rcu_read_lock(); |
539 | do { | |
80594fc2 | 540 | profile = __lookupn_profile(&ns->base, hname, n); |
01e2b670 JJ |
541 | } while (profile && !aa_get_profile_not0(profile)); |
542 | rcu_read_unlock(); | |
c88d4c7b | 543 | |
bf83208e | 544 | /* the unconfined profile is not in the regular profile list */ |
80594fc2 | 545 | if (!profile && strncmp(hname, "unconfined", n) == 0) |
fa2ac468 | 546 | profile = aa_get_newest_profile(ns->unconfined); |
bf83208e | 547 | |
c88d4c7b JJ |
548 | /* refcount released by caller */ |
549 | return profile; | |
550 | } | |
551 | ||
80594fc2 JJ |
552 | struct aa_profile *aa_lookup_profile(struct aa_ns *ns, const char *hname) |
553 | { | |
554 | return aa_lookupn_profile(ns, hname, strlen(hname)); | |
555 | } | |
556 | ||
557 | struct aa_profile *aa_fqlookupn_profile(struct aa_label *base, | |
558 | const char *fqname, size_t n) | |
559 | { | |
560 | struct aa_profile *profile; | |
561 | struct aa_ns *ns; | |
562 | const char *name, *ns_name; | |
563 | size_t ns_len; | |
564 | ||
565 | name = aa_splitn_fqname(fqname, n, &ns_name, &ns_len); | |
566 | if (ns_name) { | |
567 | ns = aa_findn_ns(labels_ns(base), ns_name, ns_len); | |
568 | if (!ns) | |
569 | return NULL; | |
570 | } else | |
571 | ns = aa_get_ns(labels_ns(base)); | |
572 | ||
573 | if (name) | |
574 | profile = aa_lookupn_profile(ns, name, n - (name - fqname)); | |
575 | else if (ns) | |
576 | /* default profile for ns, currently unconfined */ | |
577 | profile = aa_get_newest_profile(ns->unconfined); | |
578 | else | |
579 | profile = NULL; | |
580 | aa_put_ns(ns); | |
581 | ||
582 | return profile; | |
583 | } | |
584 | ||
c88d4c7b JJ |
585 | /** |
586 | * replacement_allowed - test to see if replacement is allowed | |
587 | * @profile: profile to test if it can be replaced (MAYBE NULL) | |
588 | * @noreplace: true if replacement shouldn't be allowed but addition is okay | |
589 | * @info: Returns - info about why replacement failed (NOT NULL) | |
590 | * | |
591 | * Returns: %0 if replacement allowed else error code | |
592 | */ | |
593 | static int replacement_allowed(struct aa_profile *profile, int noreplace, | |
594 | const char **info) | |
595 | { | |
596 | if (profile) { | |
80594fc2 | 597 | if (profile->label.flags & FLAG_IMMUTIBLE) { |
c88d4c7b JJ |
598 | *info = "cannot replace immutible profile"; |
599 | return -EPERM; | |
600 | } else if (noreplace) { | |
601 | *info = "profile already exists"; | |
602 | return -EEXIST; | |
603 | } | |
604 | } | |
605 | return 0; | |
606 | } | |
607 | ||
80594fc2 JJ |
608 | /* audit callback for net specific fields */ |
609 | static void audit_cb(struct audit_buffer *ab, void *va) | |
610 | { | |
611 | struct common_audit_data *sa = va; | |
612 | ||
613 | if (aad(sa)->iface.ns) { | |
614 | audit_log_format(ab, " ns="); | |
615 | audit_log_untrustedstring(ab, aad(sa)->iface.ns); | |
616 | } | |
617 | } | |
618 | ||
c88d4c7b | 619 | /** |
80594fc2 JJ |
620 | * audit_policy - Do auditing of policy changes |
621 | * @label: label to check if it can manage policy | |
c88d4c7b | 622 | * @op: policy operation being performed |
80594fc2 | 623 | * @profile: name of profile being manipulated (NOT NULL) |
c88d4c7b JJ |
624 | * @info: any extra information to be audited (MAYBE NULL) |
625 | * @error: error code | |
626 | * | |
627 | * Returns: the error to be returned after audit is done | |
628 | */ | |
80594fc2 JJ |
629 | static int audit_policy(struct aa_label *label, const char *op, |
630 | const char *ns_name, const char *name, | |
631 | const char *info, int error) | |
c88d4c7b | 632 | { |
80594fc2 JJ |
633 | DEFINE_AUDIT_DATA(sa, LSM_AUDIT_DATA_NONE, op); |
634 | // aad(&sa)->op = op; | |
635 | aad(&sa)->iface.ns = ns_name; | |
636 | aad(&sa)->name = name; | |
637 | aad(&sa)->info = info; | |
638 | aad(&sa)->error = error; | |
639 | aad(&sa)->label = label; | |
640 | ||
641 | aa_audit_msg(AUDIT_APPARMOR_STATUS, &sa, audit_cb); | |
642 | ||
643 | return error; | |
c88d4c7b JJ |
644 | } |
645 | ||
11141223 JJ |
646 | /** |
647 | * policy_view_capable - check if viewing policy in at @ns is allowed | |
648 | * ns: namespace being viewed by current task (may be NULL) | |
649 | * Returns: true if viewing policy is allowed | |
650 | * | |
651 | * If @ns is NULL then the namespace being viewed is assumed to be the | |
652 | * tasks current namespace. | |
653 | */ | |
654 | bool policy_view_capable(struct aa_ns *ns) | |
58acf9d9 JJ |
655 | { |
656 | struct user_namespace *user_ns = current_user_ns(); | |
11141223 | 657 | struct aa_ns *view_ns = aa_get_current_ns(); |
451dc704 JJ |
658 | bool root_in_user_ns = uid_eq(current_euid(), make_kuid(user_ns, 0)) || |
659 | in_egroup_p(make_kgid(user_ns, 0)); | |
58acf9d9 | 660 | bool response = false; |
11141223 JJ |
661 | if (!ns) |
662 | ns = view_ns; | |
58acf9d9 | 663 | |
11141223 | 664 | if (root_in_user_ns && aa_ns_visible(view_ns, ns, true) && |
8ccc1769 | 665 | (user_ns == &init_user_ns || |
590a154b | 666 | (unprivileged_userns_apparmor_policy != 0 && |
11141223 | 667 | user_ns->level == view_ns->level))) |
8ccc1769 | 668 | response = true; |
11141223 | 669 | aa_put_ns(view_ns); |
8ccc1769 TH |
670 | |
671 | return response; | |
672 | } | |
673 | ||
11141223 | 674 | bool policy_admin_capable(struct aa_ns *ns) |
8ccc1769 TH |
675 | { |
676 | struct user_namespace *user_ns = current_user_ns(); | |
451dc704 | 677 | bool capable = ns_capable(user_ns, CAP_MAC_ADMIN); |
8ccc1769 | 678 | |
451dc704 JJ |
679 | AA_DEBUG("cap_mac_admin? %d\n", capable); |
680 | AA_DEBUG("policy locked? %d\n", aa_g_lock_policy); | |
58acf9d9 | 681 | |
11141223 | 682 | return policy_view_capable(ns) && capable && !aa_g_lock_policy; |
58acf9d9 JJ |
683 | } |
684 | ||
c88d4c7b JJ |
685 | /** |
686 | * aa_may_manage_policy - can the current task manage policy | |
80594fc2 | 687 | * @label: label to check if it can manage policy |
c88d4c7b JJ |
688 | * @op: the policy manipulation operation being done |
689 | * | |
80594fc2 | 690 | * Returns: 0 if the task is allowed to manipulate policy else error |
c88d4c7b | 691 | */ |
11141223 | 692 | int aa_may_manage_policy(struct aa_label *label, struct aa_ns *ns, u32 mask) |
c88d4c7b | 693 | { |
80594fc2 JJ |
694 | const char *op; |
695 | ||
696 | if (mask & AA_MAY_REMOVE_POLICY) | |
697 | op = OP_PROF_RM; | |
698 | else if (mask & AA_MAY_REPLACE_POLICY) | |
699 | op = OP_PROF_REPL; | |
700 | else | |
701 | op = OP_PROF_LOAD; | |
702 | ||
c88d4c7b | 703 | /* check if loading policy is locked out */ |
80594fc2 JJ |
704 | if (aa_g_lock_policy) |
705 | return audit_policy(label, op, NULL, NULL, "policy_locked", | |
706 | -EACCES); | |
c88d4c7b | 707 | |
11141223 | 708 | if (!policy_admin_capable(ns)) |
80594fc2 JJ |
709 | return audit_policy(label, op, NULL, NULL, "not policy admin", |
710 | -EACCES); | |
c88d4c7b | 711 | |
80594fc2 JJ |
712 | /* TODO: add fine grained mediation of policy loads */ |
713 | return 0; | |
c88d4c7b JJ |
714 | } |
715 | ||
dd51c848 JJ |
716 | static struct aa_profile *__list_lookup_parent(struct list_head *lh, |
717 | struct aa_profile *profile) | |
718 | { | |
80594fc2 | 719 | const char *base = basename(profile->base.hname); |
dd51c848 JJ |
720 | long len = base - profile->base.hname; |
721 | struct aa_load_ent *ent; | |
722 | ||
723 | /* parent won't have trailing // so remove from len */ | |
724 | if (len <= 2) | |
725 | return NULL; | |
726 | len -= 2; | |
727 | ||
728 | list_for_each_entry(ent, lh, list) { | |
729 | if (ent->new == profile) | |
730 | continue; | |
731 | if (strncmp(ent->new->base.hname, profile->base.hname, len) == | |
732 | 0 && ent->new->base.hname[len] == 0) | |
733 | return ent->new; | |
734 | } | |
735 | ||
736 | return NULL; | |
737 | } | |
738 | ||
739 | /** | |
740 | * __replace_profile - replace @old with @new on a list | |
741 | * @old: profile to be replaced (NOT NULL) | |
742 | * @new: profile to replace @old with (NOT NULL) | |
743 | * | |
744 | * Will duplicate and refcount elements that @new inherits from @old | |
745 | * and will inherit @old children. | |
746 | * | |
747 | * refcount @new for list, put @old list refcount | |
748 | * | |
749 | * Requires: namespace list lock be held, or list not be shared | |
750 | */ | |
80594fc2 | 751 | static void __replace_profile(struct aa_profile *old, struct aa_profile *new) |
dd51c848 JJ |
752 | { |
753 | struct aa_profile *child, *tmp; | |
754 | ||
755 | if (!list_empty(&old->base.profiles)) { | |
756 | LIST_HEAD(lh); | |
01e2b670 | 757 | list_splice_init_rcu(&old->base.profiles, &lh, synchronize_rcu); |
dd51c848 JJ |
758 | |
759 | list_for_each_entry_safe(child, tmp, &lh, base.list) { | |
760 | struct aa_profile *p; | |
761 | ||
762 | list_del_init(&child->base.list); | |
763 | p = __find_child(&new->base.profiles, child->base.name); | |
764 | if (p) { | |
765 | /* @p replaces @child */ | |
80594fc2 | 766 | __replace_profile(child, p); |
dd51c848 JJ |
767 | continue; |
768 | } | |
769 | ||
770 | /* inherit @child and its children */ | |
771 | /* TODO: update hname of inherited children */ | |
772 | /* list refcount transferred to @new */ | |
0d259f04 | 773 | p = aa_deref_parent(child); |
01e2b670 JJ |
774 | rcu_assign_pointer(child->parent, aa_get_profile(new)); |
775 | list_add_rcu(&child->base.list, &new->base.profiles); | |
776 | aa_put_profile(p); | |
dd51c848 JJ |
777 | } |
778 | } | |
779 | ||
01e2b670 | 780 | if (!rcu_access_pointer(new->parent)) { |
0d259f04 | 781 | struct aa_profile *parent = aa_deref_parent(old); |
01e2b670 JJ |
782 | rcu_assign_pointer(new->parent, aa_get_profile(parent)); |
783 | } | |
80594fc2 JJ |
784 | aa_label_replace(&old->label, &new->label); |
785 | /* migrate dents must come after label replacement b/c update */ | |
0d259f04 | 786 | __aa_fs_profile_migrate_dents(old, new); |
dd51c848 JJ |
787 | |
788 | if (list_empty(&new->base.list)) { | |
789 | /* new is not on a list already */ | |
01e2b670 | 790 | list_replace_rcu(&old->base.list, &new->base.list); |
dd51c848 JJ |
791 | aa_get_profile(new); |
792 | aa_put_profile(old); | |
793 | } else | |
794 | __list_remove_profile(old); | |
795 | } | |
796 | ||
797 | /** | |
798 | * __lookup_replace - lookup replacement information for a profile | |
799 | * @ns - namespace the lookup occurs in | |
800 | * @hname - name of profile to lookup | |
801 | * @noreplace - true if not replacing an existing profile | |
802 | * @p - Returns: profile to be replaced | |
803 | * @info - Returns: info string on why lookup failed | |
804 | * | |
805 | * Returns: profile to replace (no ref) on success else ptr error | |
806 | */ | |
80594fc2 | 807 | static int __lookup_replace(struct aa_ns *ns, const char *hname, |
dd51c848 JJ |
808 | bool noreplace, struct aa_profile **p, |
809 | const char **info) | |
810 | { | |
811 | *p = aa_get_profile(__lookup_profile(&ns->base, hname)); | |
812 | if (*p) { | |
813 | int error = replacement_allowed(*p, noreplace, info); | |
814 | if (error) { | |
815 | *info = "profile can not be replaced"; | |
816 | return error; | |
817 | } | |
818 | } | |
819 | ||
820 | return 0; | |
821 | } | |
822 | ||
80594fc2 JJ |
823 | static void share_name(struct aa_profile *old, struct aa_profile *new) |
824 | { | |
825 | aa_put_str(new->base.hname); | |
826 | aa_get_str(old->base.hname); | |
827 | new->base.hname = old->base.hname; | |
828 | new->base.name = old->base.name; | |
829 | new->label.hname = old->label.hname; | |
830 | } | |
831 | ||
832 | /* Update to newest version of parent after previous replacements | |
833 | * Returns: unrefcount newest version of parent | |
834 | */ | |
835 | static struct aa_profile *update_to_newest_parent(struct aa_profile *new) | |
836 | { | |
837 | struct aa_profile *parent, *newest; | |
838 | parent = rcu_dereference_protected(new->parent, | |
839 | mutex_is_locked(&new->ns->lock)); | |
840 | newest = aa_get_newest_profile(parent); | |
841 | ||
842 | /* parent replaced in this atomic set? */ | |
843 | if (newest != parent) { | |
844 | aa_put_profile(parent); | |
845 | rcu_assign_pointer(new->parent, newest); | |
846 | } else | |
847 | aa_put_profile(newest); | |
848 | ||
849 | return newest; | |
850 | } | |
851 | ||
c88d4c7b JJ |
852 | /** |
853 | * aa_replace_profiles - replace profile(s) on the profile list | |
0acae0c2 | 854 | * @view: namespace load is viewed from |
80594fc2 JJ |
855 | * @label: label that is attempting to load/replace policy |
856 | * @mask: permission mask | |
c88d4c7b | 857 | * @udata: serialized data stream (NOT NULL) |
c88d4c7b JJ |
858 | * |
859 | * unpack and replace a profile on the profile list and uses of that profile | |
80594fc2 | 860 | * by any aa_task_ctx. If the profile does not exist on the profile list |
c88d4c7b JJ |
861 | * it is added. |
862 | * | |
863 | * Returns: size of data consumed else error code on failure. | |
864 | */ | |
0acae0c2 JJ |
865 | ssize_t aa_replace_profiles(struct aa_ns *view, struct aa_label *label, |
866 | u32 mask, struct aa_loaddata *udata) | |
c88d4c7b | 867 | { |
bf15cf0c | 868 | const char *ns_name, *info = NULL; |
80594fc2 | 869 | struct aa_ns *ns = NULL; |
dd51c848 | 870 | struct aa_load_ent *ent, *tmp; |
80594fc2 JJ |
871 | const char *op = mask & AA_MAY_REPLACE_POLICY ? OP_PROF_REPL : OP_PROF_LOAD; |
872 | ssize_t count, error; | |
873 | ||
dd51c848 | 874 | LIST_HEAD(lh); |
c88d4c7b JJ |
875 | |
876 | /* released below */ | |
3b8ad847 | 877 | error = aa_unpack(udata, &lh, &ns_name); |
dd51c848 JJ |
878 | if (error) |
879 | goto out; | |
c88d4c7b | 880 | |
80594fc2 JJ |
881 | /* ensure that profiles are all for the same ns |
882 | * TODO: update locking to remove this constaint. All profiles in | |
883 | * the load set must succeed as a set or the load will | |
884 | * fail. Sort ent list and take ns locks in hierarchy order | |
885 | */ | |
886 | count = 0; | |
887 | list_for_each_entry(ent, &lh, list) { | |
888 | if (ns_name) { | |
889 | if (ent->ns_name && | |
890 | strcmp(ent->ns_name, ns_name) != 0) { | |
891 | info = "policy load has mixed namespaces"; | |
892 | error = -EACCES; | |
893 | goto fail; | |
894 | } | |
895 | } else if (ent->ns_name) { | |
896 | if (count) { | |
897 | info = "policy load has mixed namespaces"; | |
898 | error = -EACCES; | |
899 | goto fail; | |
900 | } | |
901 | ns_name = ent->ns_name; | |
902 | } else | |
903 | count++; | |
c88d4c7b | 904 | } |
80594fc2 | 905 | if (ns_name) { |
0acae0c2 | 906 | ns = aa_prepare_ns(view, ns_name); |
ec25af4b | 907 | if (IS_ERR(ns)) { |
80594fc2 | 908 | info = "failed to prepare namespace"; |
ec25af4b JJ |
909 | error = PTR_ERR(ns); |
910 | ns = NULL; | |
80594fc2 JJ |
911 | goto fail; |
912 | } | |
913 | } else | |
0acae0c2 | 914 | ns = aa_get_ns(view); |
c88d4c7b | 915 | |
01e2b670 | 916 | mutex_lock(&ns->lock); |
dd51c848 JJ |
917 | /* setup parent and ns info */ |
918 | list_for_each_entry(ent, &lh, list) { | |
919 | struct aa_policy *policy; | |
80594fc2 | 920 | |
3b8ad847 | 921 | ent->new->rawdata = aa_get_loaddata(udata); |
80594fc2 JJ |
922 | error = __lookup_replace(ns, ent->new->base.hname, |
923 | !(mask & AA_MAY_REPLACE_POLICY), | |
dd51c848 JJ |
924 | &ent->old, &info); |
925 | if (error) | |
926 | goto fail_lock; | |
927 | ||
928 | if (ent->new->rename) { | |
929 | error = __lookup_replace(ns, ent->new->rename, | |
80594fc2 JJ |
930 | !(mask & AA_MAY_REPLACE_POLICY), |
931 | &ent->rename, &info); | |
dd51c848 JJ |
932 | if (error) |
933 | goto fail_lock; | |
c88d4c7b | 934 | } |
c88d4c7b | 935 | |
dd51c848 | 936 | /* released when @new is freed */ |
80594fc2 | 937 | ent->new->ns = aa_get_ns(ns); |
dd51c848 JJ |
938 | |
939 | if (ent->old || ent->rename) | |
940 | continue; | |
941 | ||
942 | /* no ref on policy only use inside lock */ | |
943 | policy = __lookup_parent(ns, ent->new->base.hname); | |
944 | if (!policy) { | |
945 | struct aa_profile *p; | |
946 | p = __list_lookup_parent(&lh, ent->new); | |
947 | if (!p) { | |
948 | error = -ENOENT; | |
949 | info = "parent does not exist"; | |
dd51c848 JJ |
950 | goto fail_lock; |
951 | } | |
01e2b670 JJ |
952 | rcu_assign_pointer(ent->new->parent, aa_get_profile(p)); |
953 | } else if (policy != &ns->base) { | |
dd51c848 | 954 | /* released on profile replacement or free_profile */ |
01e2b670 JJ |
955 | struct aa_profile *p = (struct aa_profile *) policy; |
956 | rcu_assign_pointer(ent->new->parent, aa_get_profile(p)); | |
957 | } | |
dd51c848 | 958 | } |
c88d4c7b | 959 | |
0d259f04 JJ |
960 | /* create new fs entries for introspection if needed */ |
961 | list_for_each_entry(ent, &lh, list) { | |
80594fc2 | 962 | if (!ent->old) { |
0d259f04 JJ |
963 | struct dentry *parent; |
964 | if (rcu_access_pointer(ent->new->parent)) { | |
965 | struct aa_profile *p; | |
966 | p = aa_deref_parent(ent->new); | |
967 | parent = prof_child_dir(p); | |
968 | } else | |
969 | parent = ns_subprofs_dir(ent->new->ns); | |
970 | error = __aa_fs_profile_mkdir(ent->new, parent); | |
971 | } | |
972 | ||
973 | if (error) { | |
80594fc2 | 974 | info = "failed to create"; |
0d259f04 JJ |
975 | goto fail_lock; |
976 | } | |
977 | } | |
978 | ||
979 | /* Done with checks that may fail - do actual replacement */ | |
dd51c848 JJ |
980 | list_for_each_entry_safe(ent, tmp, &lh, list) { |
981 | list_del_init(&ent->list); | |
982 | op = (!ent->old && !ent->rename) ? OP_PROF_LOAD : OP_PROF_REPL; | |
983 | ||
80594fc2 | 984 | audit_policy(label, op, ns_name, ent->new->base.hname, NULL, error); |
dd51c848 JJ |
985 | |
986 | if (ent->old) { | |
80594fc2 JJ |
987 | share_name(ent->old, ent->new); |
988 | __replace_profile(ent->old, ent->new); | |
989 | if (ent->rename) | |
990 | __replace_profile(ent->rename, ent->new); | |
dd51c848 | 991 | } else if (ent->rename) { |
80594fc2 JJ |
992 | /* TODO: case not actually supported yet */ |
993 | ; | |
0d259f04 | 994 | } else { |
80594fc2 JJ |
995 | struct list_head *lh; |
996 | if (rcu_access_pointer(ent->new->parent)) { | |
997 | struct aa_profile *parent; | |
998 | parent = update_to_newest_parent(ent->new); | |
999 | lh = &parent->base.profiles; | |
1000 | } else | |
1001 | lh = &ns->base.profiles; | |
1002 | __add_profile(lh, ent->new); | |
0d259f04 | 1003 | } |
dd51c848 | 1004 | aa_load_ent_free(ent); |
c88d4c7b | 1005 | } |
80594fc2 | 1006 | __aa_labelset_update_subtree(ns); |
28a99263 | 1007 | __aa_bump_ns_revision(ns); |
01e2b670 | 1008 | mutex_unlock(&ns->lock); |
c88d4c7b JJ |
1009 | |
1010 | out: | |
80594fc2 | 1011 | aa_put_ns(ns); |
dd51c848 | 1012 | |
c88d4c7b JJ |
1013 | if (error) |
1014 | return error; | |
3b8ad847 | 1015 | return udata->size; |
c88d4c7b | 1016 | |
dd51c848 | 1017 | fail_lock: |
01e2b670 | 1018 | mutex_unlock(&ns->lock); |
dd51c848 | 1019 | |
bf15cf0c JJ |
1020 | /* audit cause of failure */ |
1021 | op = (!ent->old) ? OP_PROF_LOAD : OP_PROF_REPL; | |
80594fc2 JJ |
1022 | fail: |
1023 | audit_policy(label, op, ns_name, ent->new->base.hname, info, error); | |
bf15cf0c JJ |
1024 | /* audit status that rest of profiles in the atomic set failed too */ |
1025 | info = "valid profile in failed atomic policy load"; | |
1026 | list_for_each_entry(tmp, &lh, list) { | |
1027 | if (tmp == ent) { | |
1028 | info = "unchecked profile in failed atomic policy load"; | |
1029 | /* skip entry that caused failure */ | |
1030 | continue; | |
1031 | } | |
1032 | op = (!ent->old) ? OP_PROF_LOAD : OP_PROF_REPL; | |
80594fc2 | 1033 | audit_policy(label, op, ns_name, tmp->new->base.hname, info, error); |
bf15cf0c | 1034 | } |
dd51c848 JJ |
1035 | list_for_each_entry_safe(ent, tmp, &lh, list) { |
1036 | list_del_init(&ent->list); | |
1037 | aa_load_ent_free(ent); | |
1038 | } | |
1039 | ||
c88d4c7b JJ |
1040 | goto out; |
1041 | } | |
1042 | ||
1043 | /** | |
1044 | * aa_remove_profiles - remove profile(s) from the system | |
0acae0c2 | 1045 | * @view: namespace the remove is being done from |
80594fc2 | 1046 | * @label: label attempting to remove policy |
c88d4c7b JJ |
1047 | * @fqname: name of the profile or namespace to remove (NOT NULL) |
1048 | * @size: size of the name | |
1049 | * | |
1050 | * Remove a profile or sub namespace from the current namespace, so that | |
1051 | * they can not be found anymore and mark them as replaced by unconfined | |
1052 | * | |
1053 | * NOTE: removing confinement does not restore rlimits to preconfinemnet values | |
1054 | * | |
1055 | * Returns: size of data consume else error code if fails | |
1056 | */ | |
0acae0c2 JJ |
1057 | ssize_t aa_remove_profiles(struct aa_ns *view, struct aa_label *label, |
1058 | char *fqname, size_t size) | |
c88d4c7b | 1059 | { |
80594fc2 | 1060 | struct aa_ns *root = NULL, *ns = NULL; |
c88d4c7b JJ |
1061 | struct aa_profile *profile = NULL; |
1062 | const char *name = fqname, *info = NULL; | |
80594fc2 | 1063 | char *ns_name = NULL; |
c88d4c7b JJ |
1064 | ssize_t error = 0; |
1065 | ||
1066 | if (*fqname == 0) { | |
1067 | info = "no profile specified"; | |
1068 | error = -ENOENT; | |
1069 | goto fail; | |
1070 | } | |
1071 | ||
0acae0c2 | 1072 | root = view; |
c88d4c7b JJ |
1073 | |
1074 | if (fqname[0] == ':') { | |
c88d4c7b | 1075 | name = aa_split_fqname(fqname, &ns_name); |
41d1b3e8 | 1076 | /* released below */ |
80594fc2 | 1077 | ns = aa_find_ns(root, ns_name); |
41d1b3e8 JJ |
1078 | if (!ns) { |
1079 | info = "namespace does not exist"; | |
1080 | error = -ENOENT; | |
1081 | goto fail; | |
c88d4c7b JJ |
1082 | } |
1083 | } else | |
1084 | /* released below */ | |
80594fc2 | 1085 | ns = aa_get_ns(root); |
c88d4c7b | 1086 | |
c88d4c7b JJ |
1087 | if (!name) { |
1088 | /* remove namespace - can only happen if fqname[0] == ':' */ | |
01e2b670 | 1089 | mutex_lock(&ns->parent->lock); |
80594fc2 | 1090 | __aa_remove_ns(ns); |
28a99263 | 1091 | __aa_bump_ns_revision(ns); |
01e2b670 | 1092 | mutex_unlock(&ns->parent->lock); |
c88d4c7b JJ |
1093 | } else { |
1094 | /* remove profile */ | |
01e2b670 | 1095 | mutex_lock(&ns->lock); |
c88d4c7b JJ |
1096 | profile = aa_get_profile(__lookup_profile(&ns->base, name)); |
1097 | if (!profile) { | |
1098 | error = -ENOENT; | |
1099 | info = "profile does not exist"; | |
1100 | goto fail_ns_lock; | |
1101 | } | |
1102 | name = profile->base.hname; | |
1103 | __remove_profile(profile); | |
80594fc2 | 1104 | __aa_labelset_update_subtree(ns); |
28a99263 | 1105 | __aa_bump_ns_revision(ns); |
01e2b670 | 1106 | mutex_unlock(&ns->lock); |
c88d4c7b | 1107 | } |
c88d4c7b JJ |
1108 | |
1109 | /* don't fail removal if audit fails */ | |
80594fc2 | 1110 | (void) audit_policy(label, OP_PROF_RM, ns_name, name, info, error); |
20920b49 | 1111 | aa_put_ns(ns); |
c88d4c7b JJ |
1112 | aa_put_profile(profile); |
1113 | return size; | |
1114 | ||
1115 | fail_ns_lock: | |
01e2b670 | 1116 | mutex_unlock(&ns->lock); |
20920b49 | 1117 | aa_put_ns(ns); |
c88d4c7b JJ |
1118 | |
1119 | fail: | |
80594fc2 | 1120 | (void) audit_policy(label, OP_PROF_RM, ns_name, name, info, error); |
c88d4c7b JJ |
1121 | return error; |
1122 | } |