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b886d83c | 1 | // SPDX-License-Identifier: GPL-2.0-only |
c88d4c7b JJ |
2 | /* |
3 | * AppArmor security module | |
4 | * | |
5 | * This file contains AppArmor policy manipulation functions | |
6 | * | |
7 | * Copyright (C) 1998-2008 Novell/SUSE | |
8 | * Copyright 2009-2010 Canonical Ltd. | |
9 | * | |
c88d4c7b JJ |
10 | * AppArmor policy is based around profiles, which contain the rules a |
11 | * task is confined by. Every task in the system has a profile attached | |
12 | * to it determined either by matching "unconfined" tasks against the | |
13 | * visible set of profiles or by following a profiles attachment rules. | |
14 | * | |
15 | * Each profile exists in a profile namespace which is a container of | |
16 | * visible profiles. Each namespace contains a special "unconfined" profile, | |
17 | * which doesn't enforce any confinement on a task beyond DAC. | |
18 | * | |
19 | * Namespace and profile names can be written together in either | |
20 | * of two syntaxes. | |
21 | * :namespace:profile - used by kernel interfaces for easy detection | |
22 | * namespace://profile - used by policy | |
23 | * | |
24 | * Profile names can not start with : or @ or ^ and may not contain \0 | |
25 | * | |
26 | * Reserved profile names | |
27 | * unconfined - special automatically generated unconfined profile | |
28 | * inherit - special name to indicate profile inheritance | |
29 | * null-XXXX-YYYY - special automatically generated learning profiles | |
30 | * | |
31 | * Namespace names may not start with / or @ and may not contain \0 or : | |
32 | * Reserved namespace names | |
33 | * user-XXXX - user defined profiles | |
34 | * | |
35 | * a // in a profile or namespace name indicates a hierarchical name with the | |
36 | * name before the // being the parent and the name after the child. | |
37 | * | |
38 | * Profile and namespace hierarchies serve two different but similar purposes. | |
39 | * The namespace contains the set of visible profiles that are considered | |
40 | * for attachment. The hierarchy of namespaces allows for virtualizing | |
41 | * the namespace so that for example a chroot can have its own set of profiles | |
42 | * which may define some local user namespaces. | |
43 | * The profile hierarchy severs two distinct purposes, | |
44 | * - it allows for sub profiles or hats, which allows an application to run | |
45 | * subprograms under its own profile with different restriction than it | |
46 | * self, and not have it use the system profile. | |
47 | * eg. if a mail program starts an editor, the policy might make the | |
48 | * restrictions tighter on the editor tighter than the mail program, | |
49 | * and definitely different than general editor restrictions | |
50 | * - it allows for binary hierarchy of profiles, so that execution history | |
51 | * is preserved. This feature isn't exploited by AppArmor reference policy | |
52 | * but is allowed. NOTE: this is currently suboptimal because profile | |
53 | * aliasing is not currently implemented so that a profile for each | |
54 | * level must be defined. | |
55 | * eg. /bin/bash///bin/ls as a name would indicate /bin/ls was started | |
56 | * from /bin/bash | |
57 | * | |
58 | * A profile or namespace name that can contain one or more // separators | |
59 | * is referred to as an hname (hierarchical). | |
60 | * eg. /bin/bash//bin/ls | |
61 | * | |
62 | * An fqname is a name that may contain both namespace and profile hnames. | |
63 | * eg. :ns:/bin/bash//bin/ls | |
64 | * | |
65 | * NOTES: | |
66 | * - locking of profile lists is currently fairly coarse. All profile | |
67 | * lists within a namespace use the namespace lock. | |
68 | * FIXME: move profile lists to using rcu_lists | |
69 | */ | |
70 | ||
71 | #include <linux/slab.h> | |
72 | #include <linux/spinlock.h> | |
73 | #include <linux/string.h> | |
5b825c3a | 74 | #include <linux/cred.h> |
b2d09103 | 75 | #include <linux/rculist.h> |
2bd8dbbf | 76 | #include <linux/user_namespace.h> |
c88d4c7b JJ |
77 | |
78 | #include "include/apparmor.h" | |
79 | #include "include/capability.h" | |
d8889d49 | 80 | #include "include/cred.h" |
c88d4c7b JJ |
81 | #include "include/file.h" |
82 | #include "include/ipc.h" | |
83 | #include "include/match.h" | |
84 | #include "include/path.h" | |
85 | #include "include/policy.h" | |
cff281f6 | 86 | #include "include/policy_ns.h" |
c88d4c7b JJ |
87 | #include "include/policy_unpack.h" |
88 | #include "include/resource.h" | |
c88d4c7b | 89 | |
2bd8dbbf | 90 | int unprivileged_userns_apparmor_policy = 1; |
c88d4c7b | 91 | |
0d259f04 | 92 | const char *const aa_profile_mode_names[] = { |
c88d4c7b JJ |
93 | "enforce", |
94 | "complain", | |
95 | "kill", | |
03816507 | 96 | "unconfined", |
c88d4c7b JJ |
97 | }; |
98 | ||
c88d4c7b JJ |
99 | |
100 | /** | |
637f688d | 101 | * __add_profile - add a profiles to list and label tree |
c88d4c7b JJ |
102 | * @list: list to add it to (NOT NULL) |
103 | * @profile: the profile to add (NOT NULL) | |
104 | * | |
105 | * refcount @profile, should be put by __list_remove_profile | |
106 | * | |
107 | * Requires: namespace lock be held, or list not be shared | |
108 | */ | |
637f688d | 109 | static void __add_profile(struct list_head *list, struct aa_profile *profile) |
c88d4c7b | 110 | { |
637f688d JJ |
111 | struct aa_label *l; |
112 | ||
113 | AA_BUG(!list); | |
114 | AA_BUG(!profile); | |
115 | AA_BUG(!profile->ns); | |
116 | AA_BUG(!mutex_is_locked(&profile->ns->lock)); | |
117 | ||
01e2b670 | 118 | list_add_rcu(&profile->base.list, list); |
c88d4c7b JJ |
119 | /* get list reference */ |
120 | aa_get_profile(profile); | |
637f688d JJ |
121 | l = aa_label_insert(&profile->ns->labels, &profile->label); |
122 | AA_BUG(l != &profile->label); | |
123 | aa_put_label(l); | |
c88d4c7b JJ |
124 | } |
125 | ||
126 | /** | |
127 | * __list_remove_profile - remove a profile from the list it is on | |
128 | * @profile: the profile to remove (NOT NULL) | |
129 | * | |
130 | * remove a profile from the list, warning generally removal should | |
131 | * be done with __replace_profile as most profile removals are | |
132 | * replacements to the unconfined profile. | |
133 | * | |
134 | * put @profile list refcount | |
135 | * | |
136 | * Requires: namespace lock be held, or list not have been live | |
137 | */ | |
138 | static void __list_remove_profile(struct aa_profile *profile) | |
139 | { | |
637f688d JJ |
140 | AA_BUG(!profile); |
141 | AA_BUG(!profile->ns); | |
142 | AA_BUG(!mutex_is_locked(&profile->ns->lock)); | |
143 | ||
01e2b670 JJ |
144 | list_del_rcu(&profile->base.list); |
145 | aa_put_profile(profile); | |
c88d4c7b JJ |
146 | } |
147 | ||
c88d4c7b JJ |
148 | /** |
149 | * __remove_profile - remove old profile, and children | |
150 | * @profile: profile to be replaced (NOT NULL) | |
151 | * | |
152 | * Requires: namespace list lock be held, or list not be shared | |
153 | */ | |
154 | static void __remove_profile(struct aa_profile *profile) | |
155 | { | |
637f688d JJ |
156 | AA_BUG(!profile); |
157 | AA_BUG(!profile->ns); | |
158 | AA_BUG(!mutex_is_locked(&profile->ns->lock)); | |
159 | ||
c88d4c7b | 160 | /* release any children lists first */ |
cff281f6 | 161 | __aa_profile_list_release(&profile->base.profiles); |
c88d4c7b | 162 | /* released by free_profile */ |
637f688d | 163 | aa_label_remove(&profile->label); |
c97204ba | 164 | __aafs_profile_rmdir(profile); |
c88d4c7b JJ |
165 | __list_remove_profile(profile); |
166 | } | |
167 | ||
168 | /** | |
cff281f6 | 169 | * __aa_profile_list_release - remove all profiles on the list and put refs |
c88d4c7b JJ |
170 | * @head: list of profiles (NOT NULL) |
171 | * | |
172 | * Requires: namespace lock be held | |
173 | */ | |
cff281f6 | 174 | void __aa_profile_list_release(struct list_head *head) |
c88d4c7b JJ |
175 | { |
176 | struct aa_profile *profile, *tmp; | |
177 | list_for_each_entry_safe(profile, tmp, head, base.list) | |
178 | __remove_profile(profile); | |
179 | } | |
180 | ||
e025be0f WH |
181 | /** |
182 | * aa_free_data - free a data blob | |
183 | * @ptr: data to free | |
184 | * @arg: unused | |
185 | */ | |
186 | static void aa_free_data(void *ptr, void *arg) | |
187 | { | |
188 | struct aa_data *data = ptr; | |
189 | ||
453431a5 WL |
190 | kfree_sensitive(data->data); |
191 | kfree_sensitive(data->key); | |
192 | kfree_sensitive(data); | |
e025be0f WH |
193 | } |
194 | ||
c88d4c7b | 195 | /** |
8651e1d6 | 196 | * aa_free_profile - free a profile |
c88d4c7b JJ |
197 | * @profile: the profile to free (MAYBE NULL) |
198 | * | |
199 | * Free a profile, its hats and null_profile. All references to the profile, | |
200 | * its hats and null_profile must have been put. | |
201 | * | |
202 | * If the profile was referenced from a task context, free_profile() will | |
203 | * be called from an rcu callback routine, so we must not sleep here. | |
204 | */ | |
8651e1d6 | 205 | void aa_free_profile(struct aa_profile *profile) |
c88d4c7b | 206 | { |
e025be0f | 207 | struct rhashtable *rht; |
8e51f908 | 208 | int i; |
e025be0f | 209 | |
c88d4c7b JJ |
210 | AA_DEBUG("%s(%p)\n", __func__, profile); |
211 | ||
212 | if (!profile) | |
213 | return; | |
214 | ||
c88d4c7b | 215 | /* free children profiles */ |
fe6bb31f | 216 | aa_policy_destroy(&profile->base); |
01e2b670 | 217 | aa_put_profile(rcu_access_pointer(profile->parent)); |
c88d4c7b | 218 | |
98849dff | 219 | aa_put_ns(profile->ns); |
453431a5 | 220 | kfree_sensitive(profile->rename); |
c88d4c7b JJ |
221 | |
222 | aa_free_file_rules(&profile->file); | |
223 | aa_free_cap_rules(&profile->caps); | |
224 | aa_free_rlimit_rules(&profile->rlimits); | |
225 | ||
73f488cd | 226 | for (i = 0; i < profile->xattr_count; i++) |
453431a5 WL |
227 | kfree_sensitive(profile->xattrs[i]); |
228 | kfree_sensitive(profile->xattrs); | |
76af016e | 229 | for (i = 0; i < profile->secmark_count; i++) |
453431a5 WL |
230 | kfree_sensitive(profile->secmark[i].label); |
231 | kfree_sensitive(profile->secmark); | |
232 | kfree_sensitive(profile->dirname); | |
c88d4c7b | 233 | aa_put_dfa(profile->xmatch); |
ad5ff3db | 234 | aa_put_dfa(profile->policy.dfa); |
c88d4c7b | 235 | |
e025be0f WH |
236 | if (profile->data) { |
237 | rht = profile->data; | |
238 | profile->data = NULL; | |
239 | rhashtable_free_and_destroy(rht, aa_free_data, NULL); | |
453431a5 | 240 | kfree_sensitive(rht); |
e025be0f WH |
241 | } |
242 | ||
453431a5 | 243 | kfree_sensitive(profile->hash); |
5ac8c355 | 244 | aa_put_loaddata(profile->rawdata); |
3622ad25 | 245 | aa_label_destroy(&profile->label); |
c88d4c7b | 246 | |
453431a5 | 247 | kfree_sensitive(profile); |
c88d4c7b JJ |
248 | } |
249 | ||
4da05cc0 JJ |
250 | /** |
251 | * aa_alloc_profile - allocate, initialize and return a new profile | |
252 | * @hname: name of the profile (NOT NULL) | |
30b026a8 | 253 | * @gfp: allocation type |
4da05cc0 JJ |
254 | * |
255 | * Returns: refcount profile or NULL on failure | |
256 | */ | |
637f688d JJ |
257 | struct aa_profile *aa_alloc_profile(const char *hname, struct aa_proxy *proxy, |
258 | gfp_t gfp) | |
4da05cc0 JJ |
259 | { |
260 | struct aa_profile *profile; | |
261 | ||
262 | /* freed by free_profile - usually through aa_put_profile */ | |
637f688d JJ |
263 | profile = kzalloc(sizeof(*profile) + sizeof(struct aa_profile *) * 2, |
264 | gfp); | |
4da05cc0 JJ |
265 | if (!profile) |
266 | return NULL; | |
267 | ||
30b026a8 | 268 | if (!aa_policy_init(&profile->base, NULL, hname, gfp)) |
77b071b3 | 269 | goto fail; |
c0929212 | 270 | if (!aa_label_init(&profile->label, 1, gfp)) |
637f688d JJ |
271 | goto fail; |
272 | ||
273 | /* update being set needed by fs interface */ | |
274 | if (!proxy) { | |
275 | proxy = aa_alloc_proxy(&profile->label, gfp); | |
276 | if (!proxy) | |
277 | goto fail; | |
278 | } else | |
279 | aa_get_proxy(proxy); | |
280 | profile->label.proxy = proxy; | |
281 | ||
282 | profile->label.hname = profile->base.hname; | |
283 | profile->label.flags |= FLAG_PROFILE; | |
284 | profile->label.vec[0] = profile; | |
4da05cc0 JJ |
285 | |
286 | /* refcount released by caller */ | |
287 | return profile; | |
77b071b3 JJ |
288 | |
289 | fail: | |
637f688d | 290 | aa_free_profile(profile); |
77b071b3 JJ |
291 | |
292 | return NULL; | |
4da05cc0 JJ |
293 | } |
294 | ||
c88d4c7b JJ |
295 | /* TODO: profile accounting - setup in remove */ |
296 | ||
297 | /** | |
ae3b3165 | 298 | * __strn_find_child - find a profile on @head list using substring of @name |
c88d4c7b JJ |
299 | * @head: list to search (NOT NULL) |
300 | * @name: name of profile (NOT NULL) | |
ae3b3165 | 301 | * @len: length of @name substring to match |
c88d4c7b | 302 | * |
01e2b670 | 303 | * Requires: rcu_read_lock be held |
c88d4c7b JJ |
304 | * |
305 | * Returns: unrefcounted profile ptr, or NULL if not found | |
306 | */ | |
ae3b3165 JJ |
307 | static struct aa_profile *__strn_find_child(struct list_head *head, |
308 | const char *name, int len) | |
c88d4c7b | 309 | { |
ae3b3165 | 310 | return (struct aa_profile *)__policy_strn_find(head, name, len); |
c88d4c7b JJ |
311 | } |
312 | ||
313 | /** | |
ae3b3165 | 314 | * __find_child - find a profile on @head list with a name matching @name |
c88d4c7b JJ |
315 | * @head: list to search (NOT NULL) |
316 | * @name: name of profile (NOT NULL) | |
c88d4c7b | 317 | * |
01e2b670 | 318 | * Requires: rcu_read_lock be held |
c88d4c7b JJ |
319 | * |
320 | * Returns: unrefcounted profile ptr, or NULL if not found | |
321 | */ | |
ae3b3165 | 322 | static struct aa_profile *__find_child(struct list_head *head, const char *name) |
c88d4c7b | 323 | { |
ae3b3165 | 324 | return __strn_find_child(head, name, strlen(name)); |
c88d4c7b JJ |
325 | } |
326 | ||
327 | /** | |
328 | * aa_find_child - find a profile by @name in @parent | |
329 | * @parent: profile to search (NOT NULL) | |
330 | * @name: profile name to search for (NOT NULL) | |
331 | * | |
332 | * Returns: a refcounted profile or NULL if not found | |
333 | */ | |
334 | struct aa_profile *aa_find_child(struct aa_profile *parent, const char *name) | |
335 | { | |
336 | struct aa_profile *profile; | |
337 | ||
01e2b670 | 338 | rcu_read_lock(); |
de7c4cc9 JJ |
339 | do { |
340 | profile = __find_child(&parent->base.profiles, name); | |
341 | } while (profile && !aa_get_profile_not0(profile)); | |
01e2b670 | 342 | rcu_read_unlock(); |
c88d4c7b JJ |
343 | |
344 | /* refcount released by caller */ | |
345 | return profile; | |
346 | } | |
347 | ||
348 | /** | |
349 | * __lookup_parent - lookup the parent of a profile of name @hname | |
350 | * @ns: namespace to lookup profile in (NOT NULL) | |
351 | * @hname: hierarchical profile name to find parent of (NOT NULL) | |
352 | * | |
353 | * Lookups up the parent of a fully qualified profile name, the profile | |
354 | * that matches hname does not need to exist, in general this | |
355 | * is used to load a new profile. | |
356 | * | |
01e2b670 | 357 | * Requires: rcu_read_lock be held |
c88d4c7b JJ |
358 | * |
359 | * Returns: unrefcounted policy or NULL if not found | |
360 | */ | |
98849dff | 361 | static struct aa_policy *__lookup_parent(struct aa_ns *ns, |
c88d4c7b JJ |
362 | const char *hname) |
363 | { | |
364 | struct aa_policy *policy; | |
365 | struct aa_profile *profile = NULL; | |
366 | char *split; | |
367 | ||
368 | policy = &ns->base; | |
369 | ||
370 | for (split = strstr(hname, "//"); split;) { | |
371 | profile = __strn_find_child(&policy->profiles, hname, | |
372 | split - hname); | |
373 | if (!profile) | |
374 | return NULL; | |
375 | policy = &profile->base; | |
376 | hname = split + 2; | |
377 | split = strstr(hname, "//"); | |
378 | } | |
379 | if (!profile) | |
380 | return &ns->base; | |
381 | return &profile->base; | |
382 | } | |
383 | ||
384 | /** | |
1741e9eb | 385 | * __lookupn_profile - lookup the profile matching @hname |
c88d4c7b JJ |
386 | * @base: base list to start looking up profile name from (NOT NULL) |
387 | * @hname: hierarchical profile name (NOT NULL) | |
1741e9eb | 388 | * @n: length of @hname |
c88d4c7b | 389 | * |
01e2b670 | 390 | * Requires: rcu_read_lock be held |
c88d4c7b JJ |
391 | * |
392 | * Returns: unrefcounted profile pointer or NULL if not found | |
393 | * | |
394 | * Do a relative name lookup, recursing through profile tree. | |
395 | */ | |
1741e9eb JJ |
396 | static struct aa_profile *__lookupn_profile(struct aa_policy *base, |
397 | const char *hname, size_t n) | |
c88d4c7b JJ |
398 | { |
399 | struct aa_profile *profile = NULL; | |
1741e9eb | 400 | const char *split; |
c88d4c7b | 401 | |
1741e9eb JJ |
402 | for (split = strnstr(hname, "//", n); split; |
403 | split = strnstr(hname, "//", n)) { | |
c88d4c7b JJ |
404 | profile = __strn_find_child(&base->profiles, hname, |
405 | split - hname); | |
406 | if (!profile) | |
407 | return NULL; | |
408 | ||
409 | base = &profile->base; | |
1741e9eb | 410 | n -= split + 2 - hname; |
c88d4c7b | 411 | hname = split + 2; |
c88d4c7b JJ |
412 | } |
413 | ||
1741e9eb JJ |
414 | if (n) |
415 | return __strn_find_child(&base->profiles, hname, n); | |
416 | return NULL; | |
417 | } | |
c88d4c7b | 418 | |
1741e9eb JJ |
419 | static struct aa_profile *__lookup_profile(struct aa_policy *base, |
420 | const char *hname) | |
421 | { | |
422 | return __lookupn_profile(base, hname, strlen(hname)); | |
c88d4c7b JJ |
423 | } |
424 | ||
425 | /** | |
426 | * aa_lookup_profile - find a profile by its full or partial name | |
427 | * @ns: the namespace to start from (NOT NULL) | |
428 | * @hname: name to do lookup on. Does not contain namespace prefix (NOT NULL) | |
1741e9eb | 429 | * @n: size of @hname |
c88d4c7b JJ |
430 | * |
431 | * Returns: refcounted profile or NULL if not found | |
432 | */ | |
1741e9eb JJ |
433 | struct aa_profile *aa_lookupn_profile(struct aa_ns *ns, const char *hname, |
434 | size_t n) | |
c88d4c7b JJ |
435 | { |
436 | struct aa_profile *profile; | |
437 | ||
01e2b670 JJ |
438 | rcu_read_lock(); |
439 | do { | |
1741e9eb | 440 | profile = __lookupn_profile(&ns->base, hname, n); |
01e2b670 JJ |
441 | } while (profile && !aa_get_profile_not0(profile)); |
442 | rcu_read_unlock(); | |
c88d4c7b | 443 | |
bf83208e | 444 | /* the unconfined profile is not in the regular profile list */ |
1741e9eb | 445 | if (!profile && strncmp(hname, "unconfined", n) == 0) |
fa2ac468 | 446 | profile = aa_get_newest_profile(ns->unconfined); |
bf83208e | 447 | |
c88d4c7b JJ |
448 | /* refcount released by caller */ |
449 | return profile; | |
450 | } | |
451 | ||
1741e9eb JJ |
452 | struct aa_profile *aa_lookup_profile(struct aa_ns *ns, const char *hname) |
453 | { | |
454 | return aa_lookupn_profile(ns, hname, strlen(hname)); | |
455 | } | |
31617ddf | 456 | |
637f688d | 457 | struct aa_profile *aa_fqlookupn_profile(struct aa_label *base, |
31617ddf JJ |
458 | const char *fqname, size_t n) |
459 | { | |
460 | struct aa_profile *profile; | |
461 | struct aa_ns *ns; | |
462 | const char *name, *ns_name; | |
463 | size_t ns_len; | |
464 | ||
465 | name = aa_splitn_fqname(fqname, n, &ns_name, &ns_len); | |
466 | if (ns_name) { | |
637f688d | 467 | ns = aa_lookupn_ns(labels_ns(base), ns_name, ns_len); |
31617ddf JJ |
468 | if (!ns) |
469 | return NULL; | |
470 | } else | |
637f688d | 471 | ns = aa_get_ns(labels_ns(base)); |
31617ddf JJ |
472 | |
473 | if (name) | |
474 | profile = aa_lookupn_profile(ns, name, n - (name - fqname)); | |
475 | else if (ns) | |
476 | /* default profile for ns, currently unconfined */ | |
477 | profile = aa_get_newest_profile(ns->unconfined); | |
478 | else | |
479 | profile = NULL; | |
480 | aa_put_ns(ns); | |
481 | ||
482 | return profile; | |
483 | } | |
484 | ||
d07881d2 JJ |
485 | /** |
486 | * aa_new_null_profile - create or find a null-X learning profile | |
487 | * @parent: profile that caused this profile to be created (NOT NULL) | |
488 | * @hat: true if the null- learning profile is a hat | |
489 | * @base: name to base the null profile off of | |
490 | * @gfp: type of allocation | |
491 | * | |
492 | * Find/Create a null- complain mode profile used in learning mode. The | |
493 | * name of the profile is unique and follows the format of parent//null-XXX. | |
494 | * where XXX is based on the @name or if that fails or is not supplied | |
495 | * a unique number | |
496 | * | |
497 | * null profiles are added to the profile list but the list does not | |
498 | * hold a count on them so that they are automatically released when | |
499 | * not in use. | |
500 | * | |
501 | * Returns: new refcounted profile else NULL on failure | |
502 | */ | |
503 | struct aa_profile *aa_new_null_profile(struct aa_profile *parent, bool hat, | |
504 | const char *base, gfp_t gfp) | |
505 | { | |
290638a5 JJ |
506 | struct aa_profile *p, *profile; |
507 | const char *bname; | |
4633307e | 508 | char *name = NULL; |
d07881d2 JJ |
509 | |
510 | AA_BUG(!parent); | |
511 | ||
512 | if (base) { | |
513 | name = kmalloc(strlen(parent->base.hname) + 8 + strlen(base), | |
514 | gfp); | |
515 | if (name) { | |
516 | sprintf(name, "%s//null-%s", parent->base.hname, base); | |
517 | goto name; | |
518 | } | |
519 | /* fall through to try shorter uniq */ | |
520 | } | |
521 | ||
522 | name = kmalloc(strlen(parent->base.hname) + 2 + 7 + 8, gfp); | |
523 | if (!name) | |
524 | return NULL; | |
525 | sprintf(name, "%s//null-%x", parent->base.hname, | |
526 | atomic_inc_return(&parent->ns->uniq_null)); | |
527 | ||
528 | name: | |
529 | /* lookup to see if this is a dup creation */ | |
290638a5 JJ |
530 | bname = basename(name); |
531 | profile = aa_find_child(parent, bname); | |
d07881d2 JJ |
532 | if (profile) |
533 | goto out; | |
534 | ||
535 | profile = aa_alloc_profile(name, NULL, gfp); | |
536 | if (!profile) | |
537 | goto fail; | |
538 | ||
539 | profile->mode = APPARMOR_COMPLAIN; | |
540 | profile->label.flags |= FLAG_NULL; | |
541 | if (hat) | |
542 | profile->label.flags |= FLAG_HAT; | |
543 | profile->path_flags = parent->path_flags; | |
544 | ||
545 | /* released on free_profile */ | |
546 | rcu_assign_pointer(profile->parent, aa_get_profile(parent)); | |
547 | profile->ns = aa_get_ns(parent->ns); | |
548 | profile->file.dfa = aa_get_dfa(nulldfa); | |
549 | profile->policy.dfa = aa_get_dfa(nulldfa); | |
550 | ||
feb3c766 | 551 | mutex_lock_nested(&profile->ns->lock, profile->ns->level); |
290638a5 JJ |
552 | p = __find_child(&parent->base.profiles, bname); |
553 | if (p) { | |
554 | aa_free_profile(profile); | |
555 | profile = aa_get_profile(p); | |
556 | } else { | |
557 | __add_profile(&parent->base.profiles, profile); | |
558 | } | |
d07881d2 JJ |
559 | mutex_unlock(&profile->ns->lock); |
560 | ||
561 | /* refcount released by caller */ | |
562 | out: | |
563 | kfree(name); | |
564 | ||
565 | return profile; | |
566 | ||
567 | fail: | |
4633307e | 568 | kfree(name); |
d07881d2 JJ |
569 | aa_free_profile(profile); |
570 | return NULL; | |
571 | } | |
572 | ||
c88d4c7b JJ |
573 | /** |
574 | * replacement_allowed - test to see if replacement is allowed | |
575 | * @profile: profile to test if it can be replaced (MAYBE NULL) | |
576 | * @noreplace: true if replacement shouldn't be allowed but addition is okay | |
577 | * @info: Returns - info about why replacement failed (NOT NULL) | |
578 | * | |
579 | * Returns: %0 if replacement allowed else error code | |
580 | */ | |
581 | static int replacement_allowed(struct aa_profile *profile, int noreplace, | |
582 | const char **info) | |
583 | { | |
584 | if (profile) { | |
637f688d | 585 | if (profile->label.flags & FLAG_IMMUTIBLE) { |
058c4f34 | 586 | *info = "cannot replace immutable profile"; |
c88d4c7b JJ |
587 | return -EPERM; |
588 | } else if (noreplace) { | |
589 | *info = "profile already exists"; | |
590 | return -EEXIST; | |
591 | } | |
592 | } | |
593 | return 0; | |
594 | } | |
595 | ||
fc1c9fd1 JJ |
596 | /* audit callback for net specific fields */ |
597 | static void audit_cb(struct audit_buffer *ab, void *va) | |
598 | { | |
599 | struct common_audit_data *sa = va; | |
600 | ||
ef88a7ac | 601 | if (aad(sa)->iface.ns) { |
fc1c9fd1 | 602 | audit_log_format(ab, " ns="); |
ef88a7ac | 603 | audit_log_untrustedstring(ab, aad(sa)->iface.ns); |
fc1c9fd1 JJ |
604 | } |
605 | } | |
606 | ||
c88d4c7b | 607 | /** |
637f688d JJ |
608 | * audit_policy - Do auditing of policy changes |
609 | * @label: label to check if it can manage policy | |
c88d4c7b | 610 | * @op: policy operation being performed |
637f688d | 611 | * @ns_name: name of namespace being manipulated |
c88d4c7b JJ |
612 | * @name: name of profile being manipulated (NOT NULL) |
613 | * @info: any extra information to be audited (MAYBE NULL) | |
614 | * @error: error code | |
615 | * | |
616 | * Returns: the error to be returned after audit is done | |
617 | */ | |
637f688d JJ |
618 | static int audit_policy(struct aa_label *label, const char *op, |
619 | const char *ns_name, const char *name, | |
fc1c9fd1 | 620 | const char *info, int error) |
c88d4c7b | 621 | { |
ef88a7ac JJ |
622 | DEFINE_AUDIT_DATA(sa, LSM_AUDIT_DATA_NONE, op); |
623 | ||
637f688d | 624 | aad(&sa)->iface.ns = ns_name; |
ef88a7ac JJ |
625 | aad(&sa)->name = name; |
626 | aad(&sa)->info = info; | |
627 | aad(&sa)->error = error; | |
637f688d | 628 | aad(&sa)->label = label; |
ef88a7ac | 629 | |
637f688d JJ |
630 | aa_audit_msg(AUDIT_APPARMOR_STATUS, &sa, audit_cb); |
631 | ||
632 | return error; | |
c88d4c7b JJ |
633 | } |
634 | ||
2bd8dbbf JJ |
635 | /** |
636 | * policy_view_capable - check if viewing policy in at @ns is allowed | |
637 | * ns: namespace being viewed by current task (may be NULL) | |
638 | * Returns: true if viewing policy is allowed | |
639 | * | |
640 | * If @ns is NULL then the namespace being viewed is assumed to be the | |
641 | * tasks current namespace. | |
642 | */ | |
643 | bool policy_view_capable(struct aa_ns *ns) | |
58acf9d9 JJ |
644 | { |
645 | struct user_namespace *user_ns = current_user_ns(); | |
2bd8dbbf JJ |
646 | struct aa_ns *view_ns = aa_get_current_ns(); |
647 | bool root_in_user_ns = uid_eq(current_euid(), make_kuid(user_ns, 0)) || | |
648 | in_egroup_p(make_kgid(user_ns, 0)); | |
58acf9d9 | 649 | bool response = false; |
2bd8dbbf JJ |
650 | if (!ns) |
651 | ns = view_ns; | |
58acf9d9 | 652 | |
2bd8dbbf JJ |
653 | if (root_in_user_ns && aa_ns_visible(view_ns, ns, true) && |
654 | (user_ns == &init_user_ns || | |
655 | (unprivileged_userns_apparmor_policy != 0 && | |
656 | user_ns->level == view_ns->level))) | |
58acf9d9 | 657 | response = true; |
2bd8dbbf | 658 | aa_put_ns(view_ns); |
58acf9d9 JJ |
659 | |
660 | return response; | |
661 | } | |
662 | ||
fd2a8043 | 663 | bool policy_admin_capable(struct aa_ns *ns) |
58acf9d9 | 664 | { |
fd2a8043 JJ |
665 | struct user_namespace *user_ns = current_user_ns(); |
666 | bool capable = ns_capable(user_ns, CAP_MAC_ADMIN); | |
667 | ||
668 | AA_DEBUG("cap_mac_admin? %d\n", capable); | |
669 | AA_DEBUG("policy locked? %d\n", aa_g_lock_policy); | |
670 | ||
671 | return policy_view_capable(ns) && capable && !aa_g_lock_policy; | |
58acf9d9 JJ |
672 | } |
673 | ||
c88d4c7b JJ |
674 | /** |
675 | * aa_may_manage_policy - can the current task manage policy | |
637f688d | 676 | * @label: label to check if it can manage policy |
c88d4c7b JJ |
677 | * @op: the policy manipulation operation being done |
678 | * | |
078c73c6 | 679 | * Returns: 0 if the task is allowed to manipulate policy else error |
c88d4c7b | 680 | */ |
637f688d | 681 | int aa_may_manage_policy(struct aa_label *label, struct aa_ns *ns, u32 mask) |
c88d4c7b | 682 | { |
18e99f19 JJ |
683 | const char *op; |
684 | ||
685 | if (mask & AA_MAY_REMOVE_POLICY) | |
686 | op = OP_PROF_RM; | |
687 | else if (mask & AA_MAY_REPLACE_POLICY) | |
688 | op = OP_PROF_REPL; | |
689 | else | |
690 | op = OP_PROF_LOAD; | |
691 | ||
c88d4c7b | 692 | /* check if loading policy is locked out */ |
078c73c6 | 693 | if (aa_g_lock_policy) |
637f688d | 694 | return audit_policy(label, op, NULL, NULL, "policy_locked", |
18e99f19 | 695 | -EACCES); |
c88d4c7b | 696 | |
078c73c6 | 697 | if (!policy_admin_capable(ns)) |
637f688d | 698 | return audit_policy(label, op, NULL, NULL, "not policy admin", |
18e99f19 | 699 | -EACCES); |
c88d4c7b | 700 | |
078c73c6 JJ |
701 | /* TODO: add fine grained mediation of policy loads */ |
702 | return 0; | |
c88d4c7b JJ |
703 | } |
704 | ||
dd51c848 JJ |
705 | static struct aa_profile *__list_lookup_parent(struct list_head *lh, |
706 | struct aa_profile *profile) | |
707 | { | |
6e474e30 | 708 | const char *base = basename(profile->base.hname); |
dd51c848 JJ |
709 | long len = base - profile->base.hname; |
710 | struct aa_load_ent *ent; | |
711 | ||
712 | /* parent won't have trailing // so remove from len */ | |
713 | if (len <= 2) | |
714 | return NULL; | |
715 | len -= 2; | |
716 | ||
717 | list_for_each_entry(ent, lh, list) { | |
718 | if (ent->new == profile) | |
719 | continue; | |
720 | if (strncmp(ent->new->base.hname, profile->base.hname, len) == | |
721 | 0 && ent->new->base.hname[len] == 0) | |
722 | return ent->new; | |
723 | } | |
724 | ||
725 | return NULL; | |
726 | } | |
727 | ||
728 | /** | |
729 | * __replace_profile - replace @old with @new on a list | |
730 | * @old: profile to be replaced (NOT NULL) | |
731 | * @new: profile to replace @old with (NOT NULL) | |
8399588a | 732 | * @share_proxy: transfer @old->proxy to @new |
dd51c848 JJ |
733 | * |
734 | * Will duplicate and refcount elements that @new inherits from @old | |
735 | * and will inherit @old children. | |
736 | * | |
737 | * refcount @new for list, put @old list refcount | |
738 | * | |
739 | * Requires: namespace list lock be held, or list not be shared | |
740 | */ | |
637f688d | 741 | static void __replace_profile(struct aa_profile *old, struct aa_profile *new) |
dd51c848 JJ |
742 | { |
743 | struct aa_profile *child, *tmp; | |
744 | ||
745 | if (!list_empty(&old->base.profiles)) { | |
746 | LIST_HEAD(lh); | |
01e2b670 | 747 | list_splice_init_rcu(&old->base.profiles, &lh, synchronize_rcu); |
dd51c848 JJ |
748 | |
749 | list_for_each_entry_safe(child, tmp, &lh, base.list) { | |
750 | struct aa_profile *p; | |
751 | ||
752 | list_del_init(&child->base.list); | |
753 | p = __find_child(&new->base.profiles, child->base.name); | |
754 | if (p) { | |
755 | /* @p replaces @child */ | |
637f688d | 756 | __replace_profile(child, p); |
dd51c848 JJ |
757 | continue; |
758 | } | |
759 | ||
760 | /* inherit @child and its children */ | |
761 | /* TODO: update hname of inherited children */ | |
762 | /* list refcount transferred to @new */ | |
0d259f04 | 763 | p = aa_deref_parent(child); |
01e2b670 JJ |
764 | rcu_assign_pointer(child->parent, aa_get_profile(new)); |
765 | list_add_rcu(&child->base.list, &new->base.profiles); | |
766 | aa_put_profile(p); | |
dd51c848 JJ |
767 | } |
768 | } | |
769 | ||
01e2b670 | 770 | if (!rcu_access_pointer(new->parent)) { |
0d259f04 | 771 | struct aa_profile *parent = aa_deref_parent(old); |
01e2b670 JJ |
772 | rcu_assign_pointer(new->parent, aa_get_profile(parent)); |
773 | } | |
637f688d JJ |
774 | aa_label_replace(&old->label, &new->label); |
775 | /* migrate dents must come after label replacement b/c update */ | |
c97204ba | 776 | __aafs_profile_migrate_dents(old, new); |
dd51c848 JJ |
777 | |
778 | if (list_empty(&new->base.list)) { | |
779 | /* new is not on a list already */ | |
01e2b670 | 780 | list_replace_rcu(&old->base.list, &new->base.list); |
dd51c848 JJ |
781 | aa_get_profile(new); |
782 | aa_put_profile(old); | |
783 | } else | |
784 | __list_remove_profile(old); | |
785 | } | |
786 | ||
787 | /** | |
788 | * __lookup_replace - lookup replacement information for a profile | |
789 | * @ns - namespace the lookup occurs in | |
790 | * @hname - name of profile to lookup | |
791 | * @noreplace - true if not replacing an existing profile | |
792 | * @p - Returns: profile to be replaced | |
793 | * @info - Returns: info string on why lookup failed | |
794 | * | |
795 | * Returns: profile to replace (no ref) on success else ptr error | |
796 | */ | |
98849dff | 797 | static int __lookup_replace(struct aa_ns *ns, const char *hname, |
dd51c848 JJ |
798 | bool noreplace, struct aa_profile **p, |
799 | const char **info) | |
800 | { | |
801 | *p = aa_get_profile(__lookup_profile(&ns->base, hname)); | |
802 | if (*p) { | |
803 | int error = replacement_allowed(*p, noreplace, info); | |
804 | if (error) { | |
805 | *info = "profile can not be replaced"; | |
806 | return error; | |
807 | } | |
808 | } | |
809 | ||
810 | return 0; | |
811 | } | |
812 | ||
a1bd627b JJ |
813 | static void share_name(struct aa_profile *old, struct aa_profile *new) |
814 | { | |
815 | aa_put_str(new->base.hname); | |
816 | aa_get_str(old->base.hname); | |
817 | new->base.hname = old->base.hname; | |
818 | new->base.name = old->base.name; | |
637f688d | 819 | new->label.hname = old->label.hname; |
a1bd627b JJ |
820 | } |
821 | ||
435222bc JJ |
822 | /* Update to newest version of parent after previous replacements |
823 | * Returns: unrefcount newest version of parent | |
824 | */ | |
825 | static struct aa_profile *update_to_newest_parent(struct aa_profile *new) | |
826 | { | |
827 | struct aa_profile *parent, *newest; | |
828 | ||
829 | parent = rcu_dereference_protected(new->parent, | |
830 | mutex_is_locked(&new->ns->lock)); | |
831 | newest = aa_get_newest_profile(parent); | |
832 | ||
833 | /* parent replaced in this atomic set? */ | |
834 | if (newest != parent) { | |
835 | aa_put_profile(parent); | |
836 | rcu_assign_pointer(new->parent, newest); | |
837 | } else | |
838 | aa_put_profile(newest); | |
839 | ||
840 | return newest; | |
841 | } | |
842 | ||
c88d4c7b JJ |
843 | /** |
844 | * aa_replace_profiles - replace profile(s) on the profile list | |
60285eb3 | 845 | * @policy_ns: namespace load is occurring on |
12dd7171 | 846 | * @label: label that is attempting to load/replace policy |
18e99f19 | 847 | * @mask: permission mask |
5ac8c355 | 848 | * @udata: serialized data stream (NOT NULL) |
c88d4c7b JJ |
849 | * |
850 | * unpack and replace a profile on the profile list and uses of that profile | |
e1a03f62 JJ |
851 | * by any task creds via invalidating the old version of the profile, which |
852 | * tasks will notice to update their own cred. If the profile does not exist | |
853 | * on the profile list it is added. | |
c88d4c7b JJ |
854 | * |
855 | * Returns: size of data consumed else error code on failure. | |
856 | */ | |
637f688d | 857 | ssize_t aa_replace_profiles(struct aa_ns *policy_ns, struct aa_label *label, |
18e99f19 | 858 | u32 mask, struct aa_loaddata *udata) |
c88d4c7b | 859 | { |
145a0ef2 | 860 | const char *ns_name = NULL, *info = NULL; |
98849dff | 861 | struct aa_ns *ns = NULL; |
dd51c848 | 862 | struct aa_load_ent *ent, *tmp; |
5d5182ca | 863 | struct aa_loaddata *rawdata_ent; |
18e99f19 | 864 | const char *op; |
04dc715e | 865 | ssize_t count, error; |
dd51c848 | 866 | LIST_HEAD(lh); |
c88d4c7b | 867 | |
18e99f19 | 868 | op = mask & AA_MAY_REPLACE_POLICY ? OP_PROF_REPL : OP_PROF_LOAD; |
5d5182ca | 869 | aa_get_loaddata(udata); |
c88d4c7b | 870 | /* released below */ |
5ac8c355 | 871 | error = aa_unpack(udata, &lh, &ns_name); |
dd51c848 JJ |
872 | if (error) |
873 | goto out; | |
c88d4c7b | 874 | |
04dc715e JJ |
875 | /* ensure that profiles are all for the same ns |
876 | * TODO: update locking to remove this constaint. All profiles in | |
877 | * the load set must succeed as a set or the load will | |
878 | * fail. Sort ent list and take ns locks in hierarchy order | |
879 | */ | |
880 | count = 0; | |
881 | list_for_each_entry(ent, &lh, list) { | |
882 | if (ns_name) { | |
883 | if (ent->ns_name && | |
884 | strcmp(ent->ns_name, ns_name) != 0) { | |
885 | info = "policy load has mixed namespaces"; | |
886 | error = -EACCES; | |
887 | goto fail; | |
888 | } | |
889 | } else if (ent->ns_name) { | |
890 | if (count) { | |
891 | info = "policy load has mixed namespaces"; | |
892 | error = -EACCES; | |
893 | goto fail; | |
894 | } | |
895 | ns_name = ent->ns_name; | |
896 | } else | |
897 | count++; | |
c88d4c7b | 898 | } |
04dc715e | 899 | if (ns_name) { |
637f688d | 900 | ns = aa_prepare_ns(policy_ns ? policy_ns : labels_ns(label), |
60285eb3 | 901 | ns_name); |
04dc715e | 902 | if (IS_ERR(ns)) { |
b9b144bc | 903 | op = OP_PROF_LOAD; |
04dc715e JJ |
904 | info = "failed to prepare namespace"; |
905 | error = PTR_ERR(ns); | |
906 | ns = NULL; | |
b9b144bc | 907 | ent = NULL; |
04dc715e JJ |
908 | goto fail; |
909 | } | |
910 | } else | |
637f688d | 911 | ns = aa_get_ns(policy_ns ? policy_ns : labels_ns(label)); |
c88d4c7b | 912 | |
feb3c766 | 913 | mutex_lock_nested(&ns->lock, ns->level); |
5d5182ca JJ |
914 | /* check for duplicate rawdata blobs: space and file dedup */ |
915 | list_for_each_entry(rawdata_ent, &ns->rawdata_list, list) { | |
916 | if (aa_rawdata_eq(rawdata_ent, udata)) { | |
917 | struct aa_loaddata *tmp; | |
918 | ||
919 | tmp = __aa_get_loaddata(rawdata_ent); | |
920 | /* check we didn't fail the race */ | |
921 | if (tmp) { | |
922 | aa_put_loaddata(udata); | |
923 | udata = tmp; | |
924 | break; | |
925 | } | |
926 | } | |
927 | } | |
dd51c848 JJ |
928 | /* setup parent and ns info */ |
929 | list_for_each_entry(ent, &lh, list) { | |
930 | struct aa_policy *policy; | |
5d5182ca | 931 | |
5ac8c355 | 932 | ent->new->rawdata = aa_get_loaddata(udata); |
18e99f19 JJ |
933 | error = __lookup_replace(ns, ent->new->base.hname, |
934 | !(mask & AA_MAY_REPLACE_POLICY), | |
dd51c848 JJ |
935 | &ent->old, &info); |
936 | if (error) | |
937 | goto fail_lock; | |
938 | ||
939 | if (ent->new->rename) { | |
940 | error = __lookup_replace(ns, ent->new->rename, | |
637f688d JJ |
941 | !(mask & AA_MAY_REPLACE_POLICY), |
942 | &ent->rename, &info); | |
dd51c848 JJ |
943 | if (error) |
944 | goto fail_lock; | |
c88d4c7b | 945 | } |
c88d4c7b | 946 | |
dd51c848 | 947 | /* released when @new is freed */ |
98849dff | 948 | ent->new->ns = aa_get_ns(ns); |
dd51c848 JJ |
949 | |
950 | if (ent->old || ent->rename) | |
951 | continue; | |
952 | ||
953 | /* no ref on policy only use inside lock */ | |
954 | policy = __lookup_parent(ns, ent->new->base.hname); | |
955 | if (!policy) { | |
956 | struct aa_profile *p; | |
957 | p = __list_lookup_parent(&lh, ent->new); | |
958 | if (!p) { | |
959 | error = -ENOENT; | |
960 | info = "parent does not exist"; | |
dd51c848 JJ |
961 | goto fail_lock; |
962 | } | |
01e2b670 JJ |
963 | rcu_assign_pointer(ent->new->parent, aa_get_profile(p)); |
964 | } else if (policy != &ns->base) { | |
dd51c848 | 965 | /* released on profile replacement or free_profile */ |
01e2b670 JJ |
966 | struct aa_profile *p = (struct aa_profile *) policy; |
967 | rcu_assign_pointer(ent->new->parent, aa_get_profile(p)); | |
968 | } | |
dd51c848 | 969 | } |
c88d4c7b | 970 | |
0d259f04 | 971 | /* create new fs entries for introspection if needed */ |
5d5182ca JJ |
972 | if (!udata->dents[AAFS_LOADDATA_DIR]) { |
973 | error = __aa_fs_create_rawdata(ns, udata); | |
974 | if (error) { | |
975 | info = "failed to create raw_data dir and files"; | |
976 | ent = NULL; | |
977 | goto fail_lock; | |
978 | } | |
979 | } | |
0d259f04 | 980 | list_for_each_entry(ent, &lh, list) { |
dca91402 | 981 | if (!ent->old) { |
0d259f04 JJ |
982 | struct dentry *parent; |
983 | if (rcu_access_pointer(ent->new->parent)) { | |
984 | struct aa_profile *p; | |
985 | p = aa_deref_parent(ent->new); | |
986 | parent = prof_child_dir(p); | |
987 | } else | |
988 | parent = ns_subprofs_dir(ent->new->ns); | |
c97204ba | 989 | error = __aafs_profile_mkdir(ent->new, parent); |
0d259f04 JJ |
990 | } |
991 | ||
992 | if (error) { | |
dca91402 | 993 | info = "failed to create"; |
0d259f04 JJ |
994 | goto fail_lock; |
995 | } | |
996 | } | |
997 | ||
998 | /* Done with checks that may fail - do actual replacement */ | |
5d5182ca JJ |
999 | __aa_bump_ns_revision(ns); |
1000 | __aa_loaddata_update(udata, ns->revision); | |
dd51c848 JJ |
1001 | list_for_each_entry_safe(ent, tmp, &lh, list) { |
1002 | list_del_init(&ent->list); | |
1003 | op = (!ent->old && !ent->rename) ? OP_PROF_LOAD : OP_PROF_REPL; | |
1004 | ||
5d5182ca JJ |
1005 | if (ent->old && ent->old->rawdata == ent->new->rawdata) { |
1006 | /* dedup actual profile replacement */ | |
637f688d | 1007 | audit_policy(label, op, ns_name, ent->new->base.hname, |
5d5182ca JJ |
1008 | "same as current profile, skipping", |
1009 | error); | |
3ddae987 JJ |
1010 | /* break refcount cycle with proxy. */ |
1011 | aa_put_proxy(ent->new->label.proxy); | |
1012 | ent->new->label.proxy = NULL; | |
5d5182ca JJ |
1013 | goto skip; |
1014 | } | |
1015 | ||
1016 | /* | |
1017 | * TODO: finer dedup based on profile range in data. Load set | |
1018 | * can differ but profile may remain unchanged | |
1019 | */ | |
637f688d JJ |
1020 | audit_policy(label, op, ns_name, ent->new->base.hname, NULL, |
1021 | error); | |
dd51c848 JJ |
1022 | |
1023 | if (ent->old) { | |
a1bd627b | 1024 | share_name(ent->old, ent->new); |
637f688d | 1025 | __replace_profile(ent->old, ent->new); |
0d259f04 | 1026 | } else { |
435222bc JJ |
1027 | struct list_head *lh; |
1028 | ||
1029 | if (rcu_access_pointer(ent->new->parent)) { | |
1030 | struct aa_profile *parent; | |
1031 | ||
1032 | parent = update_to_newest_parent(ent->new); | |
1033 | lh = &parent->base.profiles; | |
1034 | } else | |
1035 | lh = &ns->base.profiles; | |
637f688d | 1036 | __add_profile(lh, ent->new); |
0d259f04 | 1037 | } |
5d5182ca | 1038 | skip: |
dd51c848 | 1039 | aa_load_ent_free(ent); |
c88d4c7b | 1040 | } |
637f688d | 1041 | __aa_labelset_update_subtree(ns); |
01e2b670 | 1042 | mutex_unlock(&ns->lock); |
c88d4c7b JJ |
1043 | |
1044 | out: | |
98849dff | 1045 | aa_put_ns(ns); |
5d5182ca | 1046 | aa_put_loaddata(udata); |
145a0ef2 | 1047 | kfree(ns_name); |
dd51c848 | 1048 | |
c88d4c7b JJ |
1049 | if (error) |
1050 | return error; | |
5ac8c355 | 1051 | return udata->size; |
c88d4c7b | 1052 | |
dd51c848 | 1053 | fail_lock: |
01e2b670 | 1054 | mutex_unlock(&ns->lock); |
dd51c848 | 1055 | |
bf15cf0c | 1056 | /* audit cause of failure */ |
5d5182ca | 1057 | op = (ent && !ent->old) ? OP_PROF_LOAD : OP_PROF_REPL; |
04dc715e | 1058 | fail: |
637f688d JJ |
1059 | audit_policy(label, op, ns_name, ent ? ent->new->base.hname : NULL, |
1060 | info, error); | |
bf15cf0c JJ |
1061 | /* audit status that rest of profiles in the atomic set failed too */ |
1062 | info = "valid profile in failed atomic policy load"; | |
1063 | list_for_each_entry(tmp, &lh, list) { | |
1064 | if (tmp == ent) { | |
1065 | info = "unchecked profile in failed atomic policy load"; | |
1066 | /* skip entry that caused failure */ | |
1067 | continue; | |
1068 | } | |
b9b144bc | 1069 | op = (!tmp->old) ? OP_PROF_LOAD : OP_PROF_REPL; |
637f688d JJ |
1070 | audit_policy(label, op, ns_name, tmp->new->base.hname, info, |
1071 | error); | |
bf15cf0c | 1072 | } |
dd51c848 JJ |
1073 | list_for_each_entry_safe(ent, tmp, &lh, list) { |
1074 | list_del_init(&ent->list); | |
1075 | aa_load_ent_free(ent); | |
1076 | } | |
1077 | ||
c88d4c7b JJ |
1078 | goto out; |
1079 | } | |
1080 | ||
1081 | /** | |
1082 | * aa_remove_profiles - remove profile(s) from the system | |
60285eb3 | 1083 | * @policy_ns: namespace the remove is being done from |
637f688d | 1084 | * @subj: label attempting to remove policy |
c88d4c7b JJ |
1085 | * @fqname: name of the profile or namespace to remove (NOT NULL) |
1086 | * @size: size of the name | |
1087 | * | |
1088 | * Remove a profile or sub namespace from the current namespace, so that | |
1089 | * they can not be found anymore and mark them as replaced by unconfined | |
1090 | * | |
3107e8cb | 1091 | * NOTE: removing confinement does not restore rlimits to preconfinement values |
c88d4c7b JJ |
1092 | * |
1093 | * Returns: size of data consume else error code if fails | |
1094 | */ | |
637f688d | 1095 | ssize_t aa_remove_profiles(struct aa_ns *policy_ns, struct aa_label *subj, |
12dd7171 | 1096 | char *fqname, size_t size) |
c88d4c7b | 1097 | { |
60285eb3 | 1098 | struct aa_ns *ns = NULL; |
c88d4c7b JJ |
1099 | struct aa_profile *profile = NULL; |
1100 | const char *name = fqname, *info = NULL; | |
3664268f | 1101 | const char *ns_name = NULL; |
c88d4c7b JJ |
1102 | ssize_t error = 0; |
1103 | ||
1104 | if (*fqname == 0) { | |
1105 | info = "no profile specified"; | |
1106 | error = -ENOENT; | |
1107 | goto fail; | |
1108 | } | |
1109 | ||
c88d4c7b | 1110 | if (fqname[0] == ':') { |
3664268f JJ |
1111 | size_t ns_len; |
1112 | ||
1113 | name = aa_splitn_fqname(fqname, size, &ns_name, &ns_len); | |
41d1b3e8 | 1114 | /* released below */ |
637f688d JJ |
1115 | ns = aa_lookupn_ns(policy_ns ? policy_ns : labels_ns(subj), |
1116 | ns_name, ns_len); | |
41d1b3e8 JJ |
1117 | if (!ns) { |
1118 | info = "namespace does not exist"; | |
1119 | error = -ENOENT; | |
1120 | goto fail; | |
c88d4c7b JJ |
1121 | } |
1122 | } else | |
1123 | /* released below */ | |
637f688d | 1124 | ns = aa_get_ns(policy_ns ? policy_ns : labels_ns(subj)); |
c88d4c7b | 1125 | |
c88d4c7b JJ |
1126 | if (!name) { |
1127 | /* remove namespace - can only happen if fqname[0] == ':' */ | |
feb3c766 | 1128 | mutex_lock_nested(&ns->parent->lock, ns->level); |
5d5182ca | 1129 | __aa_bump_ns_revision(ns); |
8c62ed27 | 1130 | __aa_remove_ns(ns); |
01e2b670 | 1131 | mutex_unlock(&ns->parent->lock); |
c88d4c7b JJ |
1132 | } else { |
1133 | /* remove profile */ | |
feb3c766 | 1134 | mutex_lock_nested(&ns->lock, ns->level); |
c88d4c7b JJ |
1135 | profile = aa_get_profile(__lookup_profile(&ns->base, name)); |
1136 | if (!profile) { | |
1137 | error = -ENOENT; | |
1138 | info = "profile does not exist"; | |
1139 | goto fail_ns_lock; | |
1140 | } | |
1141 | name = profile->base.hname; | |
8c62ed27 | 1142 | __aa_bump_ns_revision(ns); |
c88d4c7b | 1143 | __remove_profile(profile); |
637f688d | 1144 | __aa_labelset_update_subtree(ns); |
01e2b670 | 1145 | mutex_unlock(&ns->lock); |
c88d4c7b | 1146 | } |
c88d4c7b JJ |
1147 | |
1148 | /* don't fail removal if audit fails */ | |
ef88a7ac | 1149 | (void) audit_policy(subj, OP_PROF_RM, ns_name, name, info, |
12dd7171 | 1150 | error); |
98849dff | 1151 | aa_put_ns(ns); |
c88d4c7b JJ |
1152 | aa_put_profile(profile); |
1153 | return size; | |
1154 | ||
1155 | fail_ns_lock: | |
01e2b670 | 1156 | mutex_unlock(&ns->lock); |
98849dff | 1157 | aa_put_ns(ns); |
c88d4c7b JJ |
1158 | |
1159 | fail: | |
ef88a7ac | 1160 | (void) audit_policy(subj, OP_PROF_RM, ns_name, name, info, |
12dd7171 | 1161 | error); |
c88d4c7b JJ |
1162 | return error; |
1163 | } |