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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" | |
d8889d49 | 85 | #include "include/cred.h" |
c88d4c7b JJ |
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 | ||
c88d4c7b JJ |
104 | |
105 | /** | |
637f688d | 106 | * __add_profile - add a profiles to list and label tree |
c88d4c7b JJ |
107 | * @list: list to add it to (NOT NULL) |
108 | * @profile: the profile to add (NOT NULL) | |
109 | * | |
110 | * refcount @profile, should be put by __list_remove_profile | |
111 | * | |
112 | * Requires: namespace lock be held, or list not be shared | |
113 | */ | |
637f688d | 114 | static void __add_profile(struct list_head *list, struct aa_profile *profile) |
c88d4c7b | 115 | { |
637f688d JJ |
116 | struct aa_label *l; |
117 | ||
118 | AA_BUG(!list); | |
119 | AA_BUG(!profile); | |
120 | AA_BUG(!profile->ns); | |
121 | AA_BUG(!mutex_is_locked(&profile->ns->lock)); | |
122 | ||
01e2b670 | 123 | list_add_rcu(&profile->base.list, list); |
c88d4c7b JJ |
124 | /* get list reference */ |
125 | aa_get_profile(profile); | |
637f688d JJ |
126 | l = aa_label_insert(&profile->ns->labels, &profile->label); |
127 | AA_BUG(l != &profile->label); | |
128 | aa_put_label(l); | |
c88d4c7b JJ |
129 | } |
130 | ||
131 | /** | |
132 | * __list_remove_profile - remove a profile from the list it is on | |
133 | * @profile: the profile to remove (NOT NULL) | |
134 | * | |
135 | * remove a profile from the list, warning generally removal should | |
136 | * be done with __replace_profile as most profile removals are | |
137 | * replacements to the unconfined profile. | |
138 | * | |
139 | * put @profile list refcount | |
140 | * | |
141 | * Requires: namespace lock be held, or list not have been live | |
142 | */ | |
143 | static void __list_remove_profile(struct aa_profile *profile) | |
144 | { | |
637f688d JJ |
145 | AA_BUG(!profile); |
146 | AA_BUG(!profile->ns); | |
147 | AA_BUG(!mutex_is_locked(&profile->ns->lock)); | |
148 | ||
01e2b670 JJ |
149 | list_del_rcu(&profile->base.list); |
150 | aa_put_profile(profile); | |
c88d4c7b JJ |
151 | } |
152 | ||
c88d4c7b JJ |
153 | /** |
154 | * __remove_profile - remove old profile, and children | |
155 | * @profile: profile to be replaced (NOT NULL) | |
156 | * | |
157 | * Requires: namespace list lock be held, or list not be shared | |
158 | */ | |
159 | static void __remove_profile(struct aa_profile *profile) | |
160 | { | |
637f688d JJ |
161 | AA_BUG(!profile); |
162 | AA_BUG(!profile->ns); | |
163 | AA_BUG(!mutex_is_locked(&profile->ns->lock)); | |
164 | ||
c88d4c7b | 165 | /* release any children lists first */ |
cff281f6 | 166 | __aa_profile_list_release(&profile->base.profiles); |
c88d4c7b | 167 | /* released by free_profile */ |
637f688d | 168 | aa_label_remove(&profile->label); |
c97204ba | 169 | __aafs_profile_rmdir(profile); |
c88d4c7b JJ |
170 | __list_remove_profile(profile); |
171 | } | |
172 | ||
173 | /** | |
cff281f6 | 174 | * __aa_profile_list_release - remove all profiles on the list and put refs |
c88d4c7b JJ |
175 | * @head: list of profiles (NOT NULL) |
176 | * | |
177 | * Requires: namespace lock be held | |
178 | */ | |
cff281f6 | 179 | void __aa_profile_list_release(struct list_head *head) |
c88d4c7b JJ |
180 | { |
181 | struct aa_profile *profile, *tmp; | |
182 | list_for_each_entry_safe(profile, tmp, head, base.list) | |
183 | __remove_profile(profile); | |
184 | } | |
185 | ||
e025be0f WH |
186 | /** |
187 | * aa_free_data - free a data blob | |
188 | * @ptr: data to free | |
189 | * @arg: unused | |
190 | */ | |
191 | static void aa_free_data(void *ptr, void *arg) | |
192 | { | |
193 | struct aa_data *data = ptr; | |
194 | ||
195 | kzfree(data->data); | |
196 | kzfree(data->key); | |
197 | kzfree(data); | |
198 | } | |
199 | ||
c88d4c7b | 200 | /** |
8651e1d6 | 201 | * aa_free_profile - free a profile |
c88d4c7b JJ |
202 | * @profile: the profile to free (MAYBE NULL) |
203 | * | |
204 | * Free a profile, its hats and null_profile. All references to the profile, | |
205 | * its hats and null_profile must have been put. | |
206 | * | |
207 | * If the profile was referenced from a task context, free_profile() will | |
208 | * be called from an rcu callback routine, so we must not sleep here. | |
209 | */ | |
8651e1d6 | 210 | void aa_free_profile(struct aa_profile *profile) |
c88d4c7b | 211 | { |
e025be0f | 212 | struct rhashtable *rht; |
8e51f908 | 213 | int i; |
e025be0f | 214 | |
c88d4c7b JJ |
215 | AA_DEBUG("%s(%p)\n", __func__, profile); |
216 | ||
217 | if (!profile) | |
218 | return; | |
219 | ||
c88d4c7b | 220 | /* free children profiles */ |
fe6bb31f | 221 | aa_policy_destroy(&profile->base); |
01e2b670 | 222 | aa_put_profile(rcu_access_pointer(profile->parent)); |
c88d4c7b | 223 | |
98849dff | 224 | aa_put_ns(profile->ns); |
c88d4c7b JJ |
225 | kzfree(profile->rename); |
226 | ||
227 | aa_free_file_rules(&profile->file); | |
228 | aa_free_cap_rules(&profile->caps); | |
229 | aa_free_rlimit_rules(&profile->rlimits); | |
230 | ||
73f488cd | 231 | for (i = 0; i < profile->xattr_count; i++) |
8e51f908 | 232 | kzfree(profile->xattrs[i]); |
8e51f908 | 233 | kzfree(profile->xattrs); |
9caafbe2 MG |
234 | for (i=0; i < profile->secmark_count; i++) |
235 | kzfree(profile->secmark[i].label); | |
236 | kzfree(profile->secmark); | |
0d259f04 | 237 | kzfree(profile->dirname); |
c88d4c7b | 238 | aa_put_dfa(profile->xmatch); |
ad5ff3db | 239 | aa_put_dfa(profile->policy.dfa); |
c88d4c7b | 240 | |
e025be0f WH |
241 | if (profile->data) { |
242 | rht = profile->data; | |
243 | profile->data = NULL; | |
244 | rhashtable_free_and_destroy(rht, aa_free_data, NULL); | |
245 | kzfree(rht); | |
246 | } | |
247 | ||
5cb3e91e | 248 | kzfree(profile->hash); |
5ac8c355 | 249 | aa_put_loaddata(profile->rawdata); |
c88d4c7b | 250 | |
637f688d | 251 | kzfree(profile); |
c88d4c7b JJ |
252 | } |
253 | ||
4da05cc0 JJ |
254 | /** |
255 | * aa_alloc_profile - allocate, initialize and return a new profile | |
256 | * @hname: name of the profile (NOT NULL) | |
30b026a8 | 257 | * @gfp: allocation type |
4da05cc0 JJ |
258 | * |
259 | * Returns: refcount profile or NULL on failure | |
260 | */ | |
637f688d JJ |
261 | struct aa_profile *aa_alloc_profile(const char *hname, struct aa_proxy *proxy, |
262 | gfp_t gfp) | |
4da05cc0 JJ |
263 | { |
264 | struct aa_profile *profile; | |
265 | ||
266 | /* freed by free_profile - usually through aa_put_profile */ | |
637f688d JJ |
267 | profile = kzalloc(sizeof(*profile) + sizeof(struct aa_profile *) * 2, |
268 | gfp); | |
4da05cc0 JJ |
269 | if (!profile) |
270 | return NULL; | |
271 | ||
30b026a8 | 272 | if (!aa_policy_init(&profile->base, NULL, hname, gfp)) |
77b071b3 | 273 | goto fail; |
c0929212 | 274 | if (!aa_label_init(&profile->label, 1, gfp)) |
637f688d JJ |
275 | goto fail; |
276 | ||
277 | /* update being set needed by fs interface */ | |
278 | if (!proxy) { | |
279 | proxy = aa_alloc_proxy(&profile->label, gfp); | |
280 | if (!proxy) | |
281 | goto fail; | |
282 | } else | |
283 | aa_get_proxy(proxy); | |
284 | profile->label.proxy = proxy; | |
285 | ||
286 | profile->label.hname = profile->base.hname; | |
287 | profile->label.flags |= FLAG_PROFILE; | |
288 | profile->label.vec[0] = profile; | |
4da05cc0 JJ |
289 | |
290 | /* refcount released by caller */ | |
291 | return profile; | |
77b071b3 JJ |
292 | |
293 | fail: | |
637f688d | 294 | aa_free_profile(profile); |
77b071b3 JJ |
295 | |
296 | return NULL; | |
4da05cc0 JJ |
297 | } |
298 | ||
c88d4c7b JJ |
299 | /* TODO: profile accounting - setup in remove */ |
300 | ||
301 | /** | |
ae3b3165 | 302 | * __strn_find_child - find a profile on @head list using substring of @name |
c88d4c7b JJ |
303 | * @head: list to search (NOT NULL) |
304 | * @name: name of profile (NOT NULL) | |
ae3b3165 | 305 | * @len: length of @name substring to match |
c88d4c7b | 306 | * |
01e2b670 | 307 | * Requires: rcu_read_lock be held |
c88d4c7b JJ |
308 | * |
309 | * Returns: unrefcounted profile ptr, or NULL if not found | |
310 | */ | |
ae3b3165 JJ |
311 | static struct aa_profile *__strn_find_child(struct list_head *head, |
312 | const char *name, int len) | |
c88d4c7b | 313 | { |
ae3b3165 | 314 | return (struct aa_profile *)__policy_strn_find(head, name, len); |
c88d4c7b JJ |
315 | } |
316 | ||
317 | /** | |
ae3b3165 | 318 | * __find_child - find a profile on @head list with a name matching @name |
c88d4c7b JJ |
319 | * @head: list to search (NOT NULL) |
320 | * @name: name of profile (NOT NULL) | |
c88d4c7b | 321 | * |
01e2b670 | 322 | * Requires: rcu_read_lock be held |
c88d4c7b JJ |
323 | * |
324 | * Returns: unrefcounted profile ptr, or NULL if not found | |
325 | */ | |
ae3b3165 | 326 | static struct aa_profile *__find_child(struct list_head *head, const char *name) |
c88d4c7b | 327 | { |
ae3b3165 | 328 | return __strn_find_child(head, name, strlen(name)); |
c88d4c7b JJ |
329 | } |
330 | ||
331 | /** | |
332 | * aa_find_child - find a profile by @name in @parent | |
333 | * @parent: profile to search (NOT NULL) | |
334 | * @name: profile name to search for (NOT NULL) | |
335 | * | |
336 | * Returns: a refcounted profile or NULL if not found | |
337 | */ | |
338 | struct aa_profile *aa_find_child(struct aa_profile *parent, const char *name) | |
339 | { | |
340 | struct aa_profile *profile; | |
341 | ||
01e2b670 | 342 | rcu_read_lock(); |
de7c4cc9 JJ |
343 | do { |
344 | profile = __find_child(&parent->base.profiles, name); | |
345 | } while (profile && !aa_get_profile_not0(profile)); | |
01e2b670 | 346 | rcu_read_unlock(); |
c88d4c7b JJ |
347 | |
348 | /* refcount released by caller */ | |
349 | return profile; | |
350 | } | |
351 | ||
352 | /** | |
353 | * __lookup_parent - lookup the parent of a profile of name @hname | |
354 | * @ns: namespace to lookup profile in (NOT NULL) | |
355 | * @hname: hierarchical profile name to find parent of (NOT NULL) | |
356 | * | |
357 | * Lookups up the parent of a fully qualified profile name, the profile | |
358 | * that matches hname does not need to exist, in general this | |
359 | * is used to load a new profile. | |
360 | * | |
01e2b670 | 361 | * Requires: rcu_read_lock be held |
c88d4c7b JJ |
362 | * |
363 | * Returns: unrefcounted policy or NULL if not found | |
364 | */ | |
98849dff | 365 | static struct aa_policy *__lookup_parent(struct aa_ns *ns, |
c88d4c7b JJ |
366 | const char *hname) |
367 | { | |
368 | struct aa_policy *policy; | |
369 | struct aa_profile *profile = NULL; | |
370 | char *split; | |
371 | ||
372 | policy = &ns->base; | |
373 | ||
374 | for (split = strstr(hname, "//"); split;) { | |
375 | profile = __strn_find_child(&policy->profiles, hname, | |
376 | split - hname); | |
377 | if (!profile) | |
378 | return NULL; | |
379 | policy = &profile->base; | |
380 | hname = split + 2; | |
381 | split = strstr(hname, "//"); | |
382 | } | |
383 | if (!profile) | |
384 | return &ns->base; | |
385 | return &profile->base; | |
386 | } | |
387 | ||
388 | /** | |
1741e9eb | 389 | * __lookupn_profile - lookup the profile matching @hname |
c88d4c7b JJ |
390 | * @base: base list to start looking up profile name from (NOT NULL) |
391 | * @hname: hierarchical profile name (NOT NULL) | |
1741e9eb | 392 | * @n: length of @hname |
c88d4c7b | 393 | * |
01e2b670 | 394 | * Requires: rcu_read_lock be held |
c88d4c7b JJ |
395 | * |
396 | * Returns: unrefcounted profile pointer or NULL if not found | |
397 | * | |
398 | * Do a relative name lookup, recursing through profile tree. | |
399 | */ | |
1741e9eb JJ |
400 | static struct aa_profile *__lookupn_profile(struct aa_policy *base, |
401 | const char *hname, size_t n) | |
c88d4c7b JJ |
402 | { |
403 | struct aa_profile *profile = NULL; | |
1741e9eb | 404 | const char *split; |
c88d4c7b | 405 | |
1741e9eb JJ |
406 | for (split = strnstr(hname, "//", n); split; |
407 | split = strnstr(hname, "//", n)) { | |
c88d4c7b JJ |
408 | profile = __strn_find_child(&base->profiles, hname, |
409 | split - hname); | |
410 | if (!profile) | |
411 | return NULL; | |
412 | ||
413 | base = &profile->base; | |
1741e9eb | 414 | n -= split + 2 - hname; |
c88d4c7b | 415 | hname = split + 2; |
c88d4c7b JJ |
416 | } |
417 | ||
1741e9eb JJ |
418 | if (n) |
419 | return __strn_find_child(&base->profiles, hname, n); | |
420 | return NULL; | |
421 | } | |
c88d4c7b | 422 | |
1741e9eb JJ |
423 | static struct aa_profile *__lookup_profile(struct aa_policy *base, |
424 | const char *hname) | |
425 | { | |
426 | return __lookupn_profile(base, hname, strlen(hname)); | |
c88d4c7b JJ |
427 | } |
428 | ||
429 | /** | |
430 | * aa_lookup_profile - find a profile by its full or partial name | |
431 | * @ns: the namespace to start from (NOT NULL) | |
432 | * @hname: name to do lookup on. Does not contain namespace prefix (NOT NULL) | |
1741e9eb | 433 | * @n: size of @hname |
c88d4c7b JJ |
434 | * |
435 | * Returns: refcounted profile or NULL if not found | |
436 | */ | |
1741e9eb JJ |
437 | struct aa_profile *aa_lookupn_profile(struct aa_ns *ns, const char *hname, |
438 | size_t n) | |
c88d4c7b JJ |
439 | { |
440 | struct aa_profile *profile; | |
441 | ||
01e2b670 JJ |
442 | rcu_read_lock(); |
443 | do { | |
1741e9eb | 444 | profile = __lookupn_profile(&ns->base, hname, n); |
01e2b670 JJ |
445 | } while (profile && !aa_get_profile_not0(profile)); |
446 | rcu_read_unlock(); | |
c88d4c7b | 447 | |
bf83208e | 448 | /* the unconfined profile is not in the regular profile list */ |
1741e9eb | 449 | if (!profile && strncmp(hname, "unconfined", n) == 0) |
fa2ac468 | 450 | profile = aa_get_newest_profile(ns->unconfined); |
bf83208e | 451 | |
c88d4c7b JJ |
452 | /* refcount released by caller */ |
453 | return profile; | |
454 | } | |
455 | ||
1741e9eb JJ |
456 | struct aa_profile *aa_lookup_profile(struct aa_ns *ns, const char *hname) |
457 | { | |
458 | return aa_lookupn_profile(ns, hname, strlen(hname)); | |
459 | } | |
31617ddf | 460 | |
637f688d | 461 | struct aa_profile *aa_fqlookupn_profile(struct aa_label *base, |
31617ddf JJ |
462 | const char *fqname, size_t n) |
463 | { | |
464 | struct aa_profile *profile; | |
465 | struct aa_ns *ns; | |
466 | const char *name, *ns_name; | |
467 | size_t ns_len; | |
468 | ||
469 | name = aa_splitn_fqname(fqname, n, &ns_name, &ns_len); | |
470 | if (ns_name) { | |
637f688d | 471 | ns = aa_lookupn_ns(labels_ns(base), ns_name, ns_len); |
31617ddf JJ |
472 | if (!ns) |
473 | return NULL; | |
474 | } else | |
637f688d | 475 | ns = aa_get_ns(labels_ns(base)); |
31617ddf JJ |
476 | |
477 | if (name) | |
478 | profile = aa_lookupn_profile(ns, name, n - (name - fqname)); | |
479 | else if (ns) | |
480 | /* default profile for ns, currently unconfined */ | |
481 | profile = aa_get_newest_profile(ns->unconfined); | |
482 | else | |
483 | profile = NULL; | |
484 | aa_put_ns(ns); | |
485 | ||
486 | return profile; | |
487 | } | |
488 | ||
d07881d2 JJ |
489 | /** |
490 | * aa_new_null_profile - create or find a null-X learning profile | |
491 | * @parent: profile that caused this profile to be created (NOT NULL) | |
492 | * @hat: true if the null- learning profile is a hat | |
493 | * @base: name to base the null profile off of | |
494 | * @gfp: type of allocation | |
495 | * | |
496 | * Find/Create a null- complain mode profile used in learning mode. The | |
497 | * name of the profile is unique and follows the format of parent//null-XXX. | |
498 | * where XXX is based on the @name or if that fails or is not supplied | |
499 | * a unique number | |
500 | * | |
501 | * null profiles are added to the profile list but the list does not | |
502 | * hold a count on them so that they are automatically released when | |
503 | * not in use. | |
504 | * | |
505 | * Returns: new refcounted profile else NULL on failure | |
506 | */ | |
507 | struct aa_profile *aa_new_null_profile(struct aa_profile *parent, bool hat, | |
508 | const char *base, gfp_t gfp) | |
509 | { | |
290638a5 JJ |
510 | struct aa_profile *p, *profile; |
511 | const char *bname; | |
4633307e | 512 | char *name = NULL; |
d07881d2 JJ |
513 | |
514 | AA_BUG(!parent); | |
515 | ||
516 | if (base) { | |
517 | name = kmalloc(strlen(parent->base.hname) + 8 + strlen(base), | |
518 | gfp); | |
519 | if (name) { | |
520 | sprintf(name, "%s//null-%s", parent->base.hname, base); | |
521 | goto name; | |
522 | } | |
523 | /* fall through to try shorter uniq */ | |
524 | } | |
525 | ||
526 | name = kmalloc(strlen(parent->base.hname) + 2 + 7 + 8, gfp); | |
527 | if (!name) | |
528 | return NULL; | |
529 | sprintf(name, "%s//null-%x", parent->base.hname, | |
530 | atomic_inc_return(&parent->ns->uniq_null)); | |
531 | ||
532 | name: | |
533 | /* lookup to see if this is a dup creation */ | |
290638a5 JJ |
534 | bname = basename(name); |
535 | profile = aa_find_child(parent, bname); | |
d07881d2 JJ |
536 | if (profile) |
537 | goto out; | |
538 | ||
539 | profile = aa_alloc_profile(name, NULL, gfp); | |
540 | if (!profile) | |
541 | goto fail; | |
542 | ||
543 | profile->mode = APPARMOR_COMPLAIN; | |
544 | profile->label.flags |= FLAG_NULL; | |
545 | if (hat) | |
546 | profile->label.flags |= FLAG_HAT; | |
547 | profile->path_flags = parent->path_flags; | |
548 | ||
549 | /* released on free_profile */ | |
550 | rcu_assign_pointer(profile->parent, aa_get_profile(parent)); | |
551 | profile->ns = aa_get_ns(parent->ns); | |
552 | profile->file.dfa = aa_get_dfa(nulldfa); | |
553 | profile->policy.dfa = aa_get_dfa(nulldfa); | |
554 | ||
feb3c766 | 555 | mutex_lock_nested(&profile->ns->lock, profile->ns->level); |
290638a5 JJ |
556 | p = __find_child(&parent->base.profiles, bname); |
557 | if (p) { | |
558 | aa_free_profile(profile); | |
559 | profile = aa_get_profile(p); | |
560 | } else { | |
561 | __add_profile(&parent->base.profiles, profile); | |
562 | } | |
d07881d2 JJ |
563 | mutex_unlock(&profile->ns->lock); |
564 | ||
565 | /* refcount released by caller */ | |
566 | out: | |
567 | kfree(name); | |
568 | ||
569 | return profile; | |
570 | ||
571 | fail: | |
4633307e | 572 | kfree(name); |
d07881d2 JJ |
573 | aa_free_profile(profile); |
574 | return NULL; | |
575 | } | |
576 | ||
c88d4c7b JJ |
577 | /** |
578 | * replacement_allowed - test to see if replacement is allowed | |
579 | * @profile: profile to test if it can be replaced (MAYBE NULL) | |
580 | * @noreplace: true if replacement shouldn't be allowed but addition is okay | |
581 | * @info: Returns - info about why replacement failed (NOT NULL) | |
582 | * | |
583 | * Returns: %0 if replacement allowed else error code | |
584 | */ | |
585 | static int replacement_allowed(struct aa_profile *profile, int noreplace, | |
586 | const char **info) | |
587 | { | |
588 | if (profile) { | |
637f688d | 589 | if (profile->label.flags & FLAG_IMMUTIBLE) { |
c88d4c7b JJ |
590 | *info = "cannot replace immutible profile"; |
591 | return -EPERM; | |
592 | } else if (noreplace) { | |
593 | *info = "profile already exists"; | |
594 | return -EEXIST; | |
595 | } | |
596 | } | |
597 | return 0; | |
598 | } | |
599 | ||
fc1c9fd1 JJ |
600 | /* audit callback for net specific fields */ |
601 | static void audit_cb(struct audit_buffer *ab, void *va) | |
602 | { | |
603 | struct common_audit_data *sa = va; | |
604 | ||
ef88a7ac | 605 | if (aad(sa)->iface.ns) { |
fc1c9fd1 | 606 | audit_log_format(ab, " ns="); |
ef88a7ac | 607 | audit_log_untrustedstring(ab, aad(sa)->iface.ns); |
fc1c9fd1 JJ |
608 | } |
609 | } | |
610 | ||
c88d4c7b | 611 | /** |
637f688d JJ |
612 | * audit_policy - Do auditing of policy changes |
613 | * @label: label to check if it can manage policy | |
c88d4c7b | 614 | * @op: policy operation being performed |
637f688d | 615 | * @ns_name: name of namespace being manipulated |
c88d4c7b JJ |
616 | * @name: name of profile being manipulated (NOT NULL) |
617 | * @info: any extra information to be audited (MAYBE NULL) | |
618 | * @error: error code | |
619 | * | |
620 | * Returns: the error to be returned after audit is done | |
621 | */ | |
637f688d JJ |
622 | static int audit_policy(struct aa_label *label, const char *op, |
623 | const char *ns_name, const char *name, | |
fc1c9fd1 | 624 | const char *info, int error) |
c88d4c7b | 625 | { |
ef88a7ac JJ |
626 | DEFINE_AUDIT_DATA(sa, LSM_AUDIT_DATA_NONE, op); |
627 | ||
637f688d | 628 | aad(&sa)->iface.ns = ns_name; |
ef88a7ac JJ |
629 | aad(&sa)->name = name; |
630 | aad(&sa)->info = info; | |
631 | aad(&sa)->error = error; | |
637f688d | 632 | aad(&sa)->label = label; |
ef88a7ac | 633 | |
637f688d JJ |
634 | aa_audit_msg(AUDIT_APPARMOR_STATUS, &sa, audit_cb); |
635 | ||
636 | return error; | |
c88d4c7b JJ |
637 | } |
638 | ||
2bd8dbbf JJ |
639 | /** |
640 | * policy_view_capable - check if viewing policy in at @ns is allowed | |
641 | * ns: namespace being viewed by current task (may be NULL) | |
642 | * Returns: true if viewing policy is allowed | |
643 | * | |
644 | * If @ns is NULL then the namespace being viewed is assumed to be the | |
645 | * tasks current namespace. | |
646 | */ | |
647 | bool policy_view_capable(struct aa_ns *ns) | |
58acf9d9 JJ |
648 | { |
649 | struct user_namespace *user_ns = current_user_ns(); | |
2bd8dbbf JJ |
650 | struct aa_ns *view_ns = aa_get_current_ns(); |
651 | bool root_in_user_ns = uid_eq(current_euid(), make_kuid(user_ns, 0)) || | |
652 | in_egroup_p(make_kgid(user_ns, 0)); | |
58acf9d9 | 653 | bool response = false; |
2bd8dbbf JJ |
654 | if (!ns) |
655 | ns = view_ns; | |
58acf9d9 | 656 | |
2bd8dbbf JJ |
657 | if (root_in_user_ns && aa_ns_visible(view_ns, ns, true) && |
658 | (user_ns == &init_user_ns || | |
659 | (unprivileged_userns_apparmor_policy != 0 && | |
660 | user_ns->level == view_ns->level))) | |
58acf9d9 | 661 | response = true; |
2bd8dbbf | 662 | aa_put_ns(view_ns); |
58acf9d9 JJ |
663 | |
664 | return response; | |
665 | } | |
666 | ||
fd2a8043 | 667 | bool policy_admin_capable(struct aa_ns *ns) |
58acf9d9 | 668 | { |
fd2a8043 JJ |
669 | struct user_namespace *user_ns = current_user_ns(); |
670 | bool capable = ns_capable(user_ns, CAP_MAC_ADMIN); | |
671 | ||
672 | AA_DEBUG("cap_mac_admin? %d\n", capable); | |
673 | AA_DEBUG("policy locked? %d\n", aa_g_lock_policy); | |
674 | ||
675 | return policy_view_capable(ns) && capable && !aa_g_lock_policy; | |
58acf9d9 JJ |
676 | } |
677 | ||
c88d4c7b JJ |
678 | /** |
679 | * aa_may_manage_policy - can the current task manage policy | |
637f688d | 680 | * @label: label to check if it can manage policy |
c88d4c7b JJ |
681 | * @op: the policy manipulation operation being done |
682 | * | |
078c73c6 | 683 | * Returns: 0 if the task is allowed to manipulate policy else error |
c88d4c7b | 684 | */ |
637f688d | 685 | int aa_may_manage_policy(struct aa_label *label, struct aa_ns *ns, u32 mask) |
c88d4c7b | 686 | { |
18e99f19 JJ |
687 | const char *op; |
688 | ||
689 | if (mask & AA_MAY_REMOVE_POLICY) | |
690 | op = OP_PROF_RM; | |
691 | else if (mask & AA_MAY_REPLACE_POLICY) | |
692 | op = OP_PROF_REPL; | |
693 | else | |
694 | op = OP_PROF_LOAD; | |
695 | ||
c88d4c7b | 696 | /* check if loading policy is locked out */ |
078c73c6 | 697 | if (aa_g_lock_policy) |
637f688d | 698 | return audit_policy(label, op, NULL, NULL, "policy_locked", |
18e99f19 | 699 | -EACCES); |
c88d4c7b | 700 | |
078c73c6 | 701 | if (!policy_admin_capable(ns)) |
637f688d | 702 | return audit_policy(label, op, NULL, NULL, "not policy admin", |
18e99f19 | 703 | -EACCES); |
c88d4c7b | 704 | |
078c73c6 JJ |
705 | /* TODO: add fine grained mediation of policy loads */ |
706 | return 0; | |
c88d4c7b JJ |
707 | } |
708 | ||
dd51c848 JJ |
709 | static struct aa_profile *__list_lookup_parent(struct list_head *lh, |
710 | struct aa_profile *profile) | |
711 | { | |
6e474e30 | 712 | const char *base = basename(profile->base.hname); |
dd51c848 JJ |
713 | long len = base - profile->base.hname; |
714 | struct aa_load_ent *ent; | |
715 | ||
716 | /* parent won't have trailing // so remove from len */ | |
717 | if (len <= 2) | |
718 | return NULL; | |
719 | len -= 2; | |
720 | ||
721 | list_for_each_entry(ent, lh, list) { | |
722 | if (ent->new == profile) | |
723 | continue; | |
724 | if (strncmp(ent->new->base.hname, profile->base.hname, len) == | |
725 | 0 && ent->new->base.hname[len] == 0) | |
726 | return ent->new; | |
727 | } | |
728 | ||
729 | return NULL; | |
730 | } | |
731 | ||
732 | /** | |
733 | * __replace_profile - replace @old with @new on a list | |
734 | * @old: profile to be replaced (NOT NULL) | |
735 | * @new: profile to replace @old with (NOT NULL) | |
8399588a | 736 | * @share_proxy: transfer @old->proxy to @new |
dd51c848 JJ |
737 | * |
738 | * Will duplicate and refcount elements that @new inherits from @old | |
739 | * and will inherit @old children. | |
740 | * | |
741 | * refcount @new for list, put @old list refcount | |
742 | * | |
743 | * Requires: namespace list lock be held, or list not be shared | |
744 | */ | |
637f688d | 745 | static void __replace_profile(struct aa_profile *old, struct aa_profile *new) |
dd51c848 JJ |
746 | { |
747 | struct aa_profile *child, *tmp; | |
748 | ||
749 | if (!list_empty(&old->base.profiles)) { | |
750 | LIST_HEAD(lh); | |
01e2b670 | 751 | list_splice_init_rcu(&old->base.profiles, &lh, synchronize_rcu); |
dd51c848 JJ |
752 | |
753 | list_for_each_entry_safe(child, tmp, &lh, base.list) { | |
754 | struct aa_profile *p; | |
755 | ||
756 | list_del_init(&child->base.list); | |
757 | p = __find_child(&new->base.profiles, child->base.name); | |
758 | if (p) { | |
759 | /* @p replaces @child */ | |
637f688d | 760 | __replace_profile(child, p); |
dd51c848 JJ |
761 | continue; |
762 | } | |
763 | ||
764 | /* inherit @child and its children */ | |
765 | /* TODO: update hname of inherited children */ | |
766 | /* list refcount transferred to @new */ | |
0d259f04 | 767 | p = aa_deref_parent(child); |
01e2b670 JJ |
768 | rcu_assign_pointer(child->parent, aa_get_profile(new)); |
769 | list_add_rcu(&child->base.list, &new->base.profiles); | |
770 | aa_put_profile(p); | |
dd51c848 JJ |
771 | } |
772 | } | |
773 | ||
01e2b670 | 774 | if (!rcu_access_pointer(new->parent)) { |
0d259f04 | 775 | struct aa_profile *parent = aa_deref_parent(old); |
01e2b670 JJ |
776 | rcu_assign_pointer(new->parent, aa_get_profile(parent)); |
777 | } | |
637f688d JJ |
778 | aa_label_replace(&old->label, &new->label); |
779 | /* migrate dents must come after label replacement b/c update */ | |
c97204ba | 780 | __aafs_profile_migrate_dents(old, new); |
dd51c848 JJ |
781 | |
782 | if (list_empty(&new->base.list)) { | |
783 | /* new is not on a list already */ | |
01e2b670 | 784 | list_replace_rcu(&old->base.list, &new->base.list); |
dd51c848 JJ |
785 | aa_get_profile(new); |
786 | aa_put_profile(old); | |
787 | } else | |
788 | __list_remove_profile(old); | |
789 | } | |
790 | ||
791 | /** | |
792 | * __lookup_replace - lookup replacement information for a profile | |
793 | * @ns - namespace the lookup occurs in | |
794 | * @hname - name of profile to lookup | |
795 | * @noreplace - true if not replacing an existing profile | |
796 | * @p - Returns: profile to be replaced | |
797 | * @info - Returns: info string on why lookup failed | |
798 | * | |
799 | * Returns: profile to replace (no ref) on success else ptr error | |
800 | */ | |
98849dff | 801 | static int __lookup_replace(struct aa_ns *ns, const char *hname, |
dd51c848 JJ |
802 | bool noreplace, struct aa_profile **p, |
803 | const char **info) | |
804 | { | |
805 | *p = aa_get_profile(__lookup_profile(&ns->base, hname)); | |
806 | if (*p) { | |
807 | int error = replacement_allowed(*p, noreplace, info); | |
808 | if (error) { | |
809 | *info = "profile can not be replaced"; | |
810 | return error; | |
811 | } | |
812 | } | |
813 | ||
814 | return 0; | |
815 | } | |
816 | ||
a1bd627b JJ |
817 | static void share_name(struct aa_profile *old, struct aa_profile *new) |
818 | { | |
819 | aa_put_str(new->base.hname); | |
820 | aa_get_str(old->base.hname); | |
821 | new->base.hname = old->base.hname; | |
822 | new->base.name = old->base.name; | |
637f688d | 823 | new->label.hname = old->label.hname; |
a1bd627b JJ |
824 | } |
825 | ||
435222bc JJ |
826 | /* Update to newest version of parent after previous replacements |
827 | * Returns: unrefcount newest version of parent | |
828 | */ | |
829 | static struct aa_profile *update_to_newest_parent(struct aa_profile *new) | |
830 | { | |
831 | struct aa_profile *parent, *newest; | |
832 | ||
833 | parent = rcu_dereference_protected(new->parent, | |
834 | mutex_is_locked(&new->ns->lock)); | |
835 | newest = aa_get_newest_profile(parent); | |
836 | ||
837 | /* parent replaced in this atomic set? */ | |
838 | if (newest != parent) { | |
839 | aa_put_profile(parent); | |
840 | rcu_assign_pointer(new->parent, newest); | |
841 | } else | |
842 | aa_put_profile(newest); | |
843 | ||
844 | return newest; | |
845 | } | |
846 | ||
c88d4c7b JJ |
847 | /** |
848 | * aa_replace_profiles - replace profile(s) on the profile list | |
60285eb3 | 849 | * @policy_ns: namespace load is occurring on |
12dd7171 | 850 | * @label: label that is attempting to load/replace policy |
18e99f19 | 851 | * @mask: permission mask |
5ac8c355 | 852 | * @udata: serialized data stream (NOT NULL) |
c88d4c7b JJ |
853 | * |
854 | * unpack and replace a profile on the profile list and uses of that profile | |
e1a03f62 JJ |
855 | * by any task creds via invalidating the old version of the profile, which |
856 | * tasks will notice to update their own cred. If the profile does not exist | |
857 | * on the profile list it is added. | |
c88d4c7b JJ |
858 | * |
859 | * Returns: size of data consumed else error code on failure. | |
860 | */ | |
637f688d | 861 | ssize_t aa_replace_profiles(struct aa_ns *policy_ns, struct aa_label *label, |
18e99f19 | 862 | u32 mask, struct aa_loaddata *udata) |
c88d4c7b | 863 | { |
bf15cf0c | 864 | const char *ns_name, *info = NULL; |
98849dff | 865 | struct aa_ns *ns = NULL; |
dd51c848 | 866 | struct aa_load_ent *ent, *tmp; |
5d5182ca | 867 | struct aa_loaddata *rawdata_ent; |
18e99f19 | 868 | const char *op; |
04dc715e | 869 | ssize_t count, error; |
dd51c848 | 870 | LIST_HEAD(lh); |
c88d4c7b | 871 | |
18e99f19 | 872 | op = mask & AA_MAY_REPLACE_POLICY ? OP_PROF_REPL : OP_PROF_LOAD; |
5d5182ca | 873 | aa_get_loaddata(udata); |
c88d4c7b | 874 | /* released below */ |
5ac8c355 | 875 | error = aa_unpack(udata, &lh, &ns_name); |
dd51c848 JJ |
876 | if (error) |
877 | goto out; | |
c88d4c7b | 878 | |
04dc715e JJ |
879 | /* ensure that profiles are all for the same ns |
880 | * TODO: update locking to remove this constaint. All profiles in | |
881 | * the load set must succeed as a set or the load will | |
882 | * fail. Sort ent list and take ns locks in hierarchy order | |
883 | */ | |
884 | count = 0; | |
885 | list_for_each_entry(ent, &lh, list) { | |
886 | if (ns_name) { | |
887 | if (ent->ns_name && | |
888 | strcmp(ent->ns_name, ns_name) != 0) { | |
889 | info = "policy load has mixed namespaces"; | |
890 | error = -EACCES; | |
891 | goto fail; | |
892 | } | |
893 | } else if (ent->ns_name) { | |
894 | if (count) { | |
895 | info = "policy load has mixed namespaces"; | |
896 | error = -EACCES; | |
897 | goto fail; | |
898 | } | |
899 | ns_name = ent->ns_name; | |
900 | } else | |
901 | count++; | |
c88d4c7b | 902 | } |
04dc715e | 903 | if (ns_name) { |
637f688d | 904 | ns = aa_prepare_ns(policy_ns ? policy_ns : labels_ns(label), |
60285eb3 | 905 | ns_name); |
04dc715e | 906 | if (IS_ERR(ns)) { |
b9b144bc | 907 | op = OP_PROF_LOAD; |
04dc715e JJ |
908 | info = "failed to prepare namespace"; |
909 | error = PTR_ERR(ns); | |
910 | ns = NULL; | |
b9b144bc | 911 | ent = NULL; |
04dc715e JJ |
912 | goto fail; |
913 | } | |
914 | } else | |
637f688d | 915 | ns = aa_get_ns(policy_ns ? policy_ns : labels_ns(label)); |
c88d4c7b | 916 | |
feb3c766 | 917 | mutex_lock_nested(&ns->lock, ns->level); |
5d5182ca JJ |
918 | /* check for duplicate rawdata blobs: space and file dedup */ |
919 | list_for_each_entry(rawdata_ent, &ns->rawdata_list, list) { | |
920 | if (aa_rawdata_eq(rawdata_ent, udata)) { | |
921 | struct aa_loaddata *tmp; | |
922 | ||
923 | tmp = __aa_get_loaddata(rawdata_ent); | |
924 | /* check we didn't fail the race */ | |
925 | if (tmp) { | |
926 | aa_put_loaddata(udata); | |
927 | udata = tmp; | |
928 | break; | |
929 | } | |
930 | } | |
931 | } | |
dd51c848 JJ |
932 | /* setup parent and ns info */ |
933 | list_for_each_entry(ent, &lh, list) { | |
934 | struct aa_policy *policy; | |
5d5182ca | 935 | |
5ac8c355 | 936 | ent->new->rawdata = aa_get_loaddata(udata); |
18e99f19 JJ |
937 | error = __lookup_replace(ns, ent->new->base.hname, |
938 | !(mask & AA_MAY_REPLACE_POLICY), | |
dd51c848 JJ |
939 | &ent->old, &info); |
940 | if (error) | |
941 | goto fail_lock; | |
942 | ||
943 | if (ent->new->rename) { | |
944 | error = __lookup_replace(ns, ent->new->rename, | |
637f688d JJ |
945 | !(mask & AA_MAY_REPLACE_POLICY), |
946 | &ent->rename, &info); | |
dd51c848 JJ |
947 | if (error) |
948 | goto fail_lock; | |
c88d4c7b | 949 | } |
c88d4c7b | 950 | |
dd51c848 | 951 | /* released when @new is freed */ |
98849dff | 952 | ent->new->ns = aa_get_ns(ns); |
dd51c848 JJ |
953 | |
954 | if (ent->old || ent->rename) | |
955 | continue; | |
956 | ||
957 | /* no ref on policy only use inside lock */ | |
958 | policy = __lookup_parent(ns, ent->new->base.hname); | |
959 | if (!policy) { | |
960 | struct aa_profile *p; | |
961 | p = __list_lookup_parent(&lh, ent->new); | |
962 | if (!p) { | |
963 | error = -ENOENT; | |
964 | info = "parent does not exist"; | |
dd51c848 JJ |
965 | goto fail_lock; |
966 | } | |
01e2b670 JJ |
967 | rcu_assign_pointer(ent->new->parent, aa_get_profile(p)); |
968 | } else if (policy != &ns->base) { | |
dd51c848 | 969 | /* released on profile replacement or free_profile */ |
01e2b670 JJ |
970 | struct aa_profile *p = (struct aa_profile *) policy; |
971 | rcu_assign_pointer(ent->new->parent, aa_get_profile(p)); | |
972 | } | |
dd51c848 | 973 | } |
c88d4c7b | 974 | |
0d259f04 | 975 | /* create new fs entries for introspection if needed */ |
5d5182ca JJ |
976 | if (!udata->dents[AAFS_LOADDATA_DIR]) { |
977 | error = __aa_fs_create_rawdata(ns, udata); | |
978 | if (error) { | |
979 | info = "failed to create raw_data dir and files"; | |
980 | ent = NULL; | |
981 | goto fail_lock; | |
982 | } | |
983 | } | |
0d259f04 | 984 | list_for_each_entry(ent, &lh, list) { |
dca91402 | 985 | if (!ent->old) { |
0d259f04 JJ |
986 | struct dentry *parent; |
987 | if (rcu_access_pointer(ent->new->parent)) { | |
988 | struct aa_profile *p; | |
989 | p = aa_deref_parent(ent->new); | |
990 | parent = prof_child_dir(p); | |
991 | } else | |
992 | parent = ns_subprofs_dir(ent->new->ns); | |
c97204ba | 993 | error = __aafs_profile_mkdir(ent->new, parent); |
0d259f04 JJ |
994 | } |
995 | ||
996 | if (error) { | |
dca91402 | 997 | info = "failed to create"; |
0d259f04 JJ |
998 | goto fail_lock; |
999 | } | |
1000 | } | |
1001 | ||
1002 | /* Done with checks that may fail - do actual replacement */ | |
5d5182ca JJ |
1003 | __aa_bump_ns_revision(ns); |
1004 | __aa_loaddata_update(udata, ns->revision); | |
dd51c848 JJ |
1005 | list_for_each_entry_safe(ent, tmp, &lh, list) { |
1006 | list_del_init(&ent->list); | |
1007 | op = (!ent->old && !ent->rename) ? OP_PROF_LOAD : OP_PROF_REPL; | |
1008 | ||
5d5182ca JJ |
1009 | if (ent->old && ent->old->rawdata == ent->new->rawdata) { |
1010 | /* dedup actual profile replacement */ | |
637f688d | 1011 | audit_policy(label, op, ns_name, ent->new->base.hname, |
5d5182ca JJ |
1012 | "same as current profile, skipping", |
1013 | error); | |
3ddae987 JJ |
1014 | /* break refcount cycle with proxy. */ |
1015 | aa_put_proxy(ent->new->label.proxy); | |
1016 | ent->new->label.proxy = NULL; | |
5d5182ca JJ |
1017 | goto skip; |
1018 | } | |
1019 | ||
1020 | /* | |
1021 | * TODO: finer dedup based on profile range in data. Load set | |
1022 | * can differ but profile may remain unchanged | |
1023 | */ | |
637f688d JJ |
1024 | audit_policy(label, op, ns_name, ent->new->base.hname, NULL, |
1025 | error); | |
dd51c848 JJ |
1026 | |
1027 | if (ent->old) { | |
a1bd627b | 1028 | share_name(ent->old, ent->new); |
637f688d | 1029 | __replace_profile(ent->old, ent->new); |
0d259f04 | 1030 | } else { |
435222bc JJ |
1031 | struct list_head *lh; |
1032 | ||
1033 | if (rcu_access_pointer(ent->new->parent)) { | |
1034 | struct aa_profile *parent; | |
1035 | ||
1036 | parent = update_to_newest_parent(ent->new); | |
1037 | lh = &parent->base.profiles; | |
1038 | } else | |
1039 | lh = &ns->base.profiles; | |
637f688d | 1040 | __add_profile(lh, ent->new); |
0d259f04 | 1041 | } |
5d5182ca | 1042 | skip: |
dd51c848 | 1043 | aa_load_ent_free(ent); |
c88d4c7b | 1044 | } |
637f688d | 1045 | __aa_labelset_update_subtree(ns); |
01e2b670 | 1046 | mutex_unlock(&ns->lock); |
c88d4c7b JJ |
1047 | |
1048 | out: | |
98849dff | 1049 | aa_put_ns(ns); |
5d5182ca | 1050 | aa_put_loaddata(udata); |
dd51c848 | 1051 | |
c88d4c7b JJ |
1052 | if (error) |
1053 | return error; | |
5ac8c355 | 1054 | return udata->size; |
c88d4c7b | 1055 | |
dd51c848 | 1056 | fail_lock: |
01e2b670 | 1057 | mutex_unlock(&ns->lock); |
dd51c848 | 1058 | |
bf15cf0c | 1059 | /* audit cause of failure */ |
5d5182ca | 1060 | op = (ent && !ent->old) ? OP_PROF_LOAD : OP_PROF_REPL; |
04dc715e | 1061 | fail: |
637f688d JJ |
1062 | audit_policy(label, op, ns_name, ent ? ent->new->base.hname : NULL, |
1063 | info, error); | |
bf15cf0c JJ |
1064 | /* audit status that rest of profiles in the atomic set failed too */ |
1065 | info = "valid profile in failed atomic policy load"; | |
1066 | list_for_each_entry(tmp, &lh, list) { | |
1067 | if (tmp == ent) { | |
1068 | info = "unchecked profile in failed atomic policy load"; | |
1069 | /* skip entry that caused failure */ | |
1070 | continue; | |
1071 | } | |
b9b144bc | 1072 | op = (!tmp->old) ? OP_PROF_LOAD : OP_PROF_REPL; |
637f688d JJ |
1073 | audit_policy(label, op, ns_name, tmp->new->base.hname, info, |
1074 | error); | |
bf15cf0c | 1075 | } |
dd51c848 JJ |
1076 | list_for_each_entry_safe(ent, tmp, &lh, list) { |
1077 | list_del_init(&ent->list); | |
1078 | aa_load_ent_free(ent); | |
1079 | } | |
1080 | ||
c88d4c7b JJ |
1081 | goto out; |
1082 | } | |
1083 | ||
1084 | /** | |
1085 | * aa_remove_profiles - remove profile(s) from the system | |
60285eb3 | 1086 | * @policy_ns: namespace the remove is being done from |
637f688d | 1087 | * @subj: label attempting to remove policy |
c88d4c7b JJ |
1088 | * @fqname: name of the profile or namespace to remove (NOT NULL) |
1089 | * @size: size of the name | |
1090 | * | |
1091 | * Remove a profile or sub namespace from the current namespace, so that | |
1092 | * they can not be found anymore and mark them as replaced by unconfined | |
1093 | * | |
3107e8cb | 1094 | * NOTE: removing confinement does not restore rlimits to preconfinement values |
c88d4c7b JJ |
1095 | * |
1096 | * Returns: size of data consume else error code if fails | |
1097 | */ | |
637f688d | 1098 | ssize_t aa_remove_profiles(struct aa_ns *policy_ns, struct aa_label *subj, |
12dd7171 | 1099 | char *fqname, size_t size) |
c88d4c7b | 1100 | { |
60285eb3 | 1101 | struct aa_ns *ns = NULL; |
c88d4c7b JJ |
1102 | struct aa_profile *profile = NULL; |
1103 | const char *name = fqname, *info = NULL; | |
3664268f | 1104 | const char *ns_name = NULL; |
c88d4c7b JJ |
1105 | ssize_t error = 0; |
1106 | ||
1107 | if (*fqname == 0) { | |
1108 | info = "no profile specified"; | |
1109 | error = -ENOENT; | |
1110 | goto fail; | |
1111 | } | |
1112 | ||
c88d4c7b | 1113 | if (fqname[0] == ':') { |
3664268f JJ |
1114 | size_t ns_len; |
1115 | ||
1116 | name = aa_splitn_fqname(fqname, size, &ns_name, &ns_len); | |
41d1b3e8 | 1117 | /* released below */ |
637f688d JJ |
1118 | ns = aa_lookupn_ns(policy_ns ? policy_ns : labels_ns(subj), |
1119 | ns_name, ns_len); | |
41d1b3e8 JJ |
1120 | if (!ns) { |
1121 | info = "namespace does not exist"; | |
1122 | error = -ENOENT; | |
1123 | goto fail; | |
c88d4c7b JJ |
1124 | } |
1125 | } else | |
1126 | /* released below */ | |
637f688d | 1127 | ns = aa_get_ns(policy_ns ? policy_ns : labels_ns(subj)); |
c88d4c7b | 1128 | |
c88d4c7b JJ |
1129 | if (!name) { |
1130 | /* remove namespace - can only happen if fqname[0] == ':' */ | |
feb3c766 | 1131 | mutex_lock_nested(&ns->parent->lock, ns->level); |
98849dff | 1132 | __aa_remove_ns(ns); |
5d5182ca | 1133 | __aa_bump_ns_revision(ns); |
01e2b670 | 1134 | mutex_unlock(&ns->parent->lock); |
c88d4c7b JJ |
1135 | } else { |
1136 | /* remove profile */ | |
feb3c766 | 1137 | mutex_lock_nested(&ns->lock, ns->level); |
c88d4c7b JJ |
1138 | profile = aa_get_profile(__lookup_profile(&ns->base, name)); |
1139 | if (!profile) { | |
1140 | error = -ENOENT; | |
1141 | info = "profile does not exist"; | |
1142 | goto fail_ns_lock; | |
1143 | } | |
1144 | name = profile->base.hname; | |
1145 | __remove_profile(profile); | |
637f688d | 1146 | __aa_labelset_update_subtree(ns); |
5d5182ca | 1147 | __aa_bump_ns_revision(ns); |
01e2b670 | 1148 | mutex_unlock(&ns->lock); |
c88d4c7b | 1149 | } |
c88d4c7b JJ |
1150 | |
1151 | /* don't fail removal if audit fails */ | |
ef88a7ac | 1152 | (void) audit_policy(subj, OP_PROF_RM, ns_name, name, info, |
12dd7171 | 1153 | error); |
98849dff | 1154 | aa_put_ns(ns); |
c88d4c7b JJ |
1155 | aa_put_profile(profile); |
1156 | return size; | |
1157 | ||
1158 | fail_ns_lock: | |
01e2b670 | 1159 | mutex_unlock(&ns->lock); |
98849dff | 1160 | aa_put_ns(ns); |
c88d4c7b JJ |
1161 | |
1162 | fail: | |
ef88a7ac | 1163 | (void) audit_policy(subj, OP_PROF_RM, ns_name, name, info, |
12dd7171 | 1164 | error); |
c88d4c7b JJ |
1165 | return error; |
1166 | } |