blob: 4243b0c3f0e4acc6d66c70ea878f32d548bebdd4 [file] [log] [blame]
John Johansenc88d4c72010-07-29 14:48:00 -07001/*
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>
Ingo Molnar5b825c32017-02-02 17:54:15 +010079#include <linux/cred.h>
Ingo Molnarb2d09102017-02-04 01:27:20 +010080#include <linux/rculist.h>
John Johansen2bd8dbb2017-01-16 00:42:50 -080081#include <linux/user_namespace.h>
John Johansenc88d4c72010-07-29 14:48:00 -070082
83#include "include/apparmor.h"
84#include "include/capability.h"
85#include "include/context.h"
86#include "include/file.h"
87#include "include/ipc.h"
88#include "include/match.h"
89#include "include/path.h"
90#include "include/policy.h"
John Johansencff281f2017-01-16 00:42:15 -080091#include "include/policy_ns.h"
John Johansenc88d4c72010-07-29 14:48:00 -070092#include "include/policy_unpack.h"
93#include "include/resource.h"
John Johansenc88d4c72010-07-29 14:48:00 -070094
John Johansen2bd8dbb2017-01-16 00:42:50 -080095int unprivileged_userns_apparmor_policy = 1;
John Johansenc88d4c72010-07-29 14:48:00 -070096
John Johansen0d259f02013-07-10 21:13:43 -070097const char *const aa_profile_mode_names[] = {
John Johansenc88d4c72010-07-29 14:48:00 -070098 "enforce",
99 "complain",
100 "kill",
John Johansen03816502013-07-10 21:12:43 -0700101 "unconfined",
John Johansenc88d4c72010-07-29 14:48:00 -0700102};
103
John Johansenc88d4c72010-07-29 14:48:00 -0700104
105/**
John Johansen637f6882017-06-09 08:14:28 -0700106 * __add_profile - add a profiles to list and label tree
John Johansenc88d4c72010-07-29 14:48:00 -0700107 * @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 */
John Johansen637f6882017-06-09 08:14:28 -0700114static void __add_profile(struct list_head *list, struct aa_profile *profile)
John Johansenc88d4c72010-07-29 14:48:00 -0700115{
John Johansen637f6882017-06-09 08:14:28 -0700116 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
John Johansen01e2b672013-07-10 21:06:43 -0700123 list_add_rcu(&profile->base.list, list);
John Johansenc88d4c72010-07-29 14:48:00 -0700124 /* get list reference */
125 aa_get_profile(profile);
John Johansen637f6882017-06-09 08:14:28 -0700126 l = aa_label_insert(&profile->ns->labels, &profile->label);
127 AA_BUG(l != &profile->label);
128 aa_put_label(l);
John Johansenc88d4c72010-07-29 14:48:00 -0700129}
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 */
143static void __list_remove_profile(struct aa_profile *profile)
144{
John Johansen637f6882017-06-09 08:14:28 -0700145 AA_BUG(!profile);
146 AA_BUG(!profile->ns);
147 AA_BUG(!mutex_is_locked(&profile->ns->lock));
148
John Johansen01e2b672013-07-10 21:06:43 -0700149 list_del_rcu(&profile->base.list);
150 aa_put_profile(profile);
John Johansenc88d4c72010-07-29 14:48:00 -0700151}
152
John Johansenc88d4c72010-07-29 14:48:00 -0700153/**
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 */
159static void __remove_profile(struct aa_profile *profile)
160{
John Johansen637f6882017-06-09 08:14:28 -0700161 AA_BUG(!profile);
162 AA_BUG(!profile->ns);
163 AA_BUG(!mutex_is_locked(&profile->ns->lock));
164
John Johansenc88d4c72010-07-29 14:48:00 -0700165 /* release any children lists first */
John Johansencff281f2017-01-16 00:42:15 -0800166 __aa_profile_list_release(&profile->base.profiles);
John Johansenc88d4c72010-07-29 14:48:00 -0700167 /* released by free_profile */
John Johansen637f6882017-06-09 08:14:28 -0700168 aa_label_remove(&profile->label);
John Johansenc97204b2017-05-25 06:23:42 -0700169 __aafs_profile_rmdir(profile);
John Johansenc88d4c72010-07-29 14:48:00 -0700170 __list_remove_profile(profile);
171}
172
173/**
John Johansencff281f2017-01-16 00:42:15 -0800174 * __aa_profile_list_release - remove all profiles on the list and put refs
John Johansenc88d4c72010-07-29 14:48:00 -0700175 * @head: list of profiles (NOT NULL)
176 *
177 * Requires: namespace lock be held
178 */
John Johansencff281f2017-01-16 00:42:15 -0800179void __aa_profile_list_release(struct list_head *head)
John Johansenc88d4c72010-07-29 14:48:00 -0700180{
181 struct aa_profile *profile, *tmp;
182 list_for_each_entry_safe(profile, tmp, head, base.list)
183 __remove_profile(profile);
184}
185
John Johansenc88d4c72010-07-29 14:48:00 -0700186/**
William Huae025be02017-01-15 16:49:28 -0800187 * aa_free_data - free a data blob
188 * @ptr: data to free
189 * @arg: unused
190 */
191static 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
200/**
John Johansen8651e1d62013-07-10 21:11:43 -0700201 * aa_free_profile - free a profile
John Johansenc88d4c72010-07-29 14:48:00 -0700202 * @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 */
John Johansen8651e1d62013-07-10 21:11:43 -0700210void aa_free_profile(struct aa_profile *profile)
John Johansenc88d4c72010-07-29 14:48:00 -0700211{
William Huae025be02017-01-15 16:49:28 -0800212 struct rhashtable *rht;
213
John Johansenc88d4c72010-07-29 14:48:00 -0700214 AA_DEBUG("%s(%p)\n", __func__, profile);
215
216 if (!profile)
217 return;
218
John Johansenc88d4c72010-07-29 14:48:00 -0700219 /* free children profiles */
John Johansenfe6bb312017-01-16 00:42:14 -0800220 aa_policy_destroy(&profile->base);
John Johansen01e2b672013-07-10 21:06:43 -0700221 aa_put_profile(rcu_access_pointer(profile->parent));
John Johansenc88d4c72010-07-29 14:48:00 -0700222
John Johansen98849df2017-01-16 00:42:16 -0800223 aa_put_ns(profile->ns);
John Johansenc88d4c72010-07-29 14:48:00 -0700224 kzfree(profile->rename);
225
226 aa_free_file_rules(&profile->file);
227 aa_free_cap_rules(&profile->caps);
228 aa_free_rlimit_rules(&profile->rlimits);
229
John Johansen0d259f02013-07-10 21:13:43 -0700230 kzfree(profile->dirname);
John Johansenc88d4c72010-07-29 14:48:00 -0700231 aa_put_dfa(profile->xmatch);
John Johansenad5ff3d2012-02-16 07:07:53 -0800232 aa_put_dfa(profile->policy.dfa);
John Johansenc88d4c72010-07-29 14:48:00 -0700233
William Huae025be02017-01-15 16:49:28 -0800234 if (profile->data) {
235 rht = profile->data;
236 profile->data = NULL;
237 rhashtable_free_and_destroy(rht, aa_free_data, NULL);
238 kzfree(rht);
239 }
240
John Johansen5cb3e912013-10-14 11:44:34 -0700241 kzfree(profile->hash);
John Johansen5ac8c352017-01-16 00:42:55 -0800242 aa_put_loaddata(profile->rawdata);
John Johansen637f6882017-06-09 08:14:28 -0700243
John Johansenc88d4c72010-07-29 14:48:00 -0700244 kzfree(profile);
245}
246
247/**
John Johansen4da05cc2013-02-18 16:11:34 -0800248 * aa_alloc_profile - allocate, initialize and return a new profile
249 * @hname: name of the profile (NOT NULL)
John Johansen30b026a2017-01-16 00:42:35 -0800250 * @gfp: allocation type
John Johansen4da05cc2013-02-18 16:11:34 -0800251 *
252 * Returns: refcount profile or NULL on failure
253 */
John Johansen637f6882017-06-09 08:14:28 -0700254struct aa_profile *aa_alloc_profile(const char *hname, struct aa_proxy *proxy,
255 gfp_t gfp)
John Johansen4da05cc2013-02-18 16:11:34 -0800256{
257 struct aa_profile *profile;
258
259 /* freed by free_profile - usually through aa_put_profile */
John Johansen637f6882017-06-09 08:14:28 -0700260 profile = kzalloc(sizeof(*profile) + sizeof(struct aa_profile *) * 2,
261 gfp);
John Johansen4da05cc2013-02-18 16:11:34 -0800262 if (!profile)
263 return NULL;
264
John Johansen30b026a2017-01-16 00:42:35 -0800265 if (!aa_policy_init(&profile->base, NULL, hname, gfp))
John Johansen77b071b2013-07-10 21:07:43 -0700266 goto fail;
John Johansen637f6882017-06-09 08:14:28 -0700267 if (!aa_label_init(&profile->label, 1))
268 goto fail;
269
270 /* update being set needed by fs interface */
271 if (!proxy) {
272 proxy = aa_alloc_proxy(&profile->label, gfp);
273 if (!proxy)
274 goto fail;
275 } else
276 aa_get_proxy(proxy);
277 profile->label.proxy = proxy;
278
279 profile->label.hname = profile->base.hname;
280 profile->label.flags |= FLAG_PROFILE;
281 profile->label.vec[0] = profile;
John Johansen4da05cc2013-02-18 16:11:34 -0800282
283 /* refcount released by caller */
284 return profile;
John Johansen77b071b2013-07-10 21:07:43 -0700285
286fail:
John Johansen637f6882017-06-09 08:14:28 -0700287 aa_free_profile(profile);
John Johansen77b071b2013-07-10 21:07:43 -0700288
289 return NULL;
John Johansen4da05cc2013-02-18 16:11:34 -0800290}
291
John Johansenc88d4c72010-07-29 14:48:00 -0700292/* TODO: profile accounting - setup in remove */
293
294/**
John Johansenc88d4c72010-07-29 14:48:00 -0700295 * __strn_find_child - find a profile on @head list using substring of @name
296 * @head: list to search (NOT NULL)
297 * @name: name of profile (NOT NULL)
298 * @len: length of @name substring to match
299 *
John Johansen01e2b672013-07-10 21:06:43 -0700300 * Requires: rcu_read_lock be held
John Johansenc88d4c72010-07-29 14:48:00 -0700301 *
302 * Returns: unrefcounted profile ptr, or NULL if not found
303 */
304static struct aa_profile *__strn_find_child(struct list_head *head,
305 const char *name, int len)
306{
307 return (struct aa_profile *)__policy_strn_find(head, name, len);
308}
309
310/**
John Johansenae3b3162017-06-02 13:50:22 -0700311 * __find_child - find a profile on @head list with a name matching @name
312 * @head: list to search (NOT NULL)
313 * @name: name of profile (NOT NULL)
314 *
315 * Requires: rcu_read_lock be held
316 *
317 * Returns: unrefcounted profile ptr, or NULL if not found
318 */
319static struct aa_profile *__find_child(struct list_head *head, const char *name)
320{
321 return __strn_find_child(head, name, strlen(name));
322}
323
324/**
John Johansenc88d4c72010-07-29 14:48:00 -0700325 * aa_find_child - find a profile by @name in @parent
326 * @parent: profile to search (NOT NULL)
327 * @name: profile name to search for (NOT NULL)
328 *
329 * Returns: a refcounted profile or NULL if not found
330 */
331struct aa_profile *aa_find_child(struct aa_profile *parent, const char *name)
332{
333 struct aa_profile *profile;
334
John Johansen01e2b672013-07-10 21:06:43 -0700335 rcu_read_lock();
John Johansende7c4cc2015-12-16 18:09:10 -0800336 do {
337 profile = __find_child(&parent->base.profiles, name);
338 } while (profile && !aa_get_profile_not0(profile));
John Johansen01e2b672013-07-10 21:06:43 -0700339 rcu_read_unlock();
John Johansenc88d4c72010-07-29 14:48:00 -0700340
341 /* refcount released by caller */
342 return profile;
343}
344
345/**
346 * __lookup_parent - lookup the parent of a profile of name @hname
347 * @ns: namespace to lookup profile in (NOT NULL)
348 * @hname: hierarchical profile name to find parent of (NOT NULL)
349 *
350 * Lookups up the parent of a fully qualified profile name, the profile
351 * that matches hname does not need to exist, in general this
352 * is used to load a new profile.
353 *
John Johansen01e2b672013-07-10 21:06:43 -0700354 * Requires: rcu_read_lock be held
John Johansenc88d4c72010-07-29 14:48:00 -0700355 *
356 * Returns: unrefcounted policy or NULL if not found
357 */
John Johansen98849df2017-01-16 00:42:16 -0800358static struct aa_policy *__lookup_parent(struct aa_ns *ns,
John Johansenc88d4c72010-07-29 14:48:00 -0700359 const char *hname)
360{
361 struct aa_policy *policy;
362 struct aa_profile *profile = NULL;
363 char *split;
364
365 policy = &ns->base;
366
367 for (split = strstr(hname, "//"); split;) {
368 profile = __strn_find_child(&policy->profiles, hname,
369 split - hname);
370 if (!profile)
371 return NULL;
372 policy = &profile->base;
373 hname = split + 2;
374 split = strstr(hname, "//");
375 }
376 if (!profile)
377 return &ns->base;
378 return &profile->base;
379}
380
381/**
John Johansen1741e9e2017-01-16 00:42:21 -0800382 * __lookupn_profile - lookup the profile matching @hname
John Johansenc88d4c72010-07-29 14:48:00 -0700383 * @base: base list to start looking up profile name from (NOT NULL)
384 * @hname: hierarchical profile name (NOT NULL)
John Johansen1741e9e2017-01-16 00:42:21 -0800385 * @n: length of @hname
John Johansenc88d4c72010-07-29 14:48:00 -0700386 *
John Johansen01e2b672013-07-10 21:06:43 -0700387 * Requires: rcu_read_lock be held
John Johansenc88d4c72010-07-29 14:48:00 -0700388 *
389 * Returns: unrefcounted profile pointer or NULL if not found
390 *
391 * Do a relative name lookup, recursing through profile tree.
392 */
John Johansen1741e9e2017-01-16 00:42:21 -0800393static struct aa_profile *__lookupn_profile(struct aa_policy *base,
394 const char *hname, size_t n)
John Johansenc88d4c72010-07-29 14:48:00 -0700395{
396 struct aa_profile *profile = NULL;
John Johansen1741e9e2017-01-16 00:42:21 -0800397 const char *split;
John Johansenc88d4c72010-07-29 14:48:00 -0700398
John Johansen1741e9e2017-01-16 00:42:21 -0800399 for (split = strnstr(hname, "//", n); split;
400 split = strnstr(hname, "//", n)) {
John Johansenc88d4c72010-07-29 14:48:00 -0700401 profile = __strn_find_child(&base->profiles, hname,
402 split - hname);
403 if (!profile)
404 return NULL;
405
406 base = &profile->base;
John Johansen1741e9e2017-01-16 00:42:21 -0800407 n -= split + 2 - hname;
John Johansenc88d4c72010-07-29 14:48:00 -0700408 hname = split + 2;
John Johansenc88d4c72010-07-29 14:48:00 -0700409 }
410
John Johansen1741e9e2017-01-16 00:42:21 -0800411 if (n)
412 return __strn_find_child(&base->profiles, hname, n);
413 return NULL;
414}
John Johansenc88d4c72010-07-29 14:48:00 -0700415
John Johansen1741e9e2017-01-16 00:42:21 -0800416static struct aa_profile *__lookup_profile(struct aa_policy *base,
417 const char *hname)
418{
419 return __lookupn_profile(base, hname, strlen(hname));
John Johansenc88d4c72010-07-29 14:48:00 -0700420}
421
422/**
423 * aa_lookup_profile - find a profile by its full or partial name
424 * @ns: the namespace to start from (NOT NULL)
425 * @hname: name to do lookup on. Does not contain namespace prefix (NOT NULL)
John Johansen1741e9e2017-01-16 00:42:21 -0800426 * @n: size of @hname
John Johansenc88d4c72010-07-29 14:48:00 -0700427 *
428 * Returns: refcounted profile or NULL if not found
429 */
John Johansen1741e9e2017-01-16 00:42:21 -0800430struct aa_profile *aa_lookupn_profile(struct aa_ns *ns, const char *hname,
431 size_t n)
John Johansenc88d4c72010-07-29 14:48:00 -0700432{
433 struct aa_profile *profile;
434
John Johansen01e2b672013-07-10 21:06:43 -0700435 rcu_read_lock();
436 do {
John Johansen1741e9e2017-01-16 00:42:21 -0800437 profile = __lookupn_profile(&ns->base, hname, n);
John Johansen01e2b672013-07-10 21:06:43 -0700438 } while (profile && !aa_get_profile_not0(profile));
439 rcu_read_unlock();
John Johansenc88d4c72010-07-29 14:48:00 -0700440
John Johansenbf832082012-05-16 11:00:05 -0700441 /* the unconfined profile is not in the regular profile list */
John Johansen1741e9e2017-01-16 00:42:21 -0800442 if (!profile && strncmp(hname, "unconfined", n) == 0)
John Johansenfa2ac462013-07-10 21:08:43 -0700443 profile = aa_get_newest_profile(ns->unconfined);
John Johansenbf832082012-05-16 11:00:05 -0700444
John Johansenc88d4c72010-07-29 14:48:00 -0700445 /* refcount released by caller */
446 return profile;
447}
448
John Johansen1741e9e2017-01-16 00:42:21 -0800449struct aa_profile *aa_lookup_profile(struct aa_ns *ns, const char *hname)
450{
451 return aa_lookupn_profile(ns, hname, strlen(hname));
452}
John Johansen31617dd2017-01-16 00:42:24 -0800453
John Johansen637f6882017-06-09 08:14:28 -0700454struct aa_profile *aa_fqlookupn_profile(struct aa_label *base,
John Johansen31617dd2017-01-16 00:42:24 -0800455 const char *fqname, size_t n)
456{
457 struct aa_profile *profile;
458 struct aa_ns *ns;
459 const char *name, *ns_name;
460 size_t ns_len;
461
462 name = aa_splitn_fqname(fqname, n, &ns_name, &ns_len);
463 if (ns_name) {
John Johansen637f6882017-06-09 08:14:28 -0700464 ns = aa_lookupn_ns(labels_ns(base), ns_name, ns_len);
John Johansen31617dd2017-01-16 00:42:24 -0800465 if (!ns)
466 return NULL;
467 } else
John Johansen637f6882017-06-09 08:14:28 -0700468 ns = aa_get_ns(labels_ns(base));
John Johansen31617dd2017-01-16 00:42:24 -0800469
470 if (name)
471 profile = aa_lookupn_profile(ns, name, n - (name - fqname));
472 else if (ns)
473 /* default profile for ns, currently unconfined */
474 profile = aa_get_newest_profile(ns->unconfined);
475 else
476 profile = NULL;
477 aa_put_ns(ns);
478
479 return profile;
480}
481
John Johansenc88d4c72010-07-29 14:48:00 -0700482/**
John Johansend07881d2017-08-16 08:59:57 -0700483 * aa_new_null_profile - create or find a null-X learning profile
484 * @parent: profile that caused this profile to be created (NOT NULL)
485 * @hat: true if the null- learning profile is a hat
486 * @base: name to base the null profile off of
487 * @gfp: type of allocation
488 *
489 * Find/Create a null- complain mode profile used in learning mode. The
490 * name of the profile is unique and follows the format of parent//null-XXX.
491 * where XXX is based on the @name or if that fails or is not supplied
492 * a unique number
493 *
494 * null profiles are added to the profile list but the list does not
495 * hold a count on them so that they are automatically released when
496 * not in use.
497 *
498 * Returns: new refcounted profile else NULL on failure
499 */
500struct aa_profile *aa_new_null_profile(struct aa_profile *parent, bool hat,
501 const char *base, gfp_t gfp)
502{
John Johansen290638a2017-08-16 05:40:49 -0700503 struct aa_profile *p, *profile;
504 const char *bname;
John Johansend07881d2017-08-16 08:59:57 -0700505 char *name;
506
507 AA_BUG(!parent);
508
509 if (base) {
510 name = kmalloc(strlen(parent->base.hname) + 8 + strlen(base),
511 gfp);
512 if (name) {
513 sprintf(name, "%s//null-%s", parent->base.hname, base);
514 goto name;
515 }
516 /* fall through to try shorter uniq */
517 }
518
519 name = kmalloc(strlen(parent->base.hname) + 2 + 7 + 8, gfp);
520 if (!name)
521 return NULL;
522 sprintf(name, "%s//null-%x", parent->base.hname,
523 atomic_inc_return(&parent->ns->uniq_null));
524
525name:
526 /* lookup to see if this is a dup creation */
John Johansen290638a2017-08-16 05:40:49 -0700527 bname = basename(name);
528 profile = aa_find_child(parent, bname);
John Johansend07881d2017-08-16 08:59:57 -0700529 if (profile)
530 goto out;
531
532 profile = aa_alloc_profile(name, NULL, gfp);
533 if (!profile)
534 goto fail;
535
536 profile->mode = APPARMOR_COMPLAIN;
537 profile->label.flags |= FLAG_NULL;
538 if (hat)
539 profile->label.flags |= FLAG_HAT;
540 profile->path_flags = parent->path_flags;
541
542 /* released on free_profile */
543 rcu_assign_pointer(profile->parent, aa_get_profile(parent));
544 profile->ns = aa_get_ns(parent->ns);
545 profile->file.dfa = aa_get_dfa(nulldfa);
546 profile->policy.dfa = aa_get_dfa(nulldfa);
547
548 mutex_lock(&profile->ns->lock);
John Johansen290638a2017-08-16 05:40:49 -0700549 p = __find_child(&parent->base.profiles, bname);
550 if (p) {
551 aa_free_profile(profile);
552 profile = aa_get_profile(p);
553 } else {
554 __add_profile(&parent->base.profiles, profile);
555 }
John Johansend07881d2017-08-16 08:59:57 -0700556 mutex_unlock(&profile->ns->lock);
557
558 /* refcount released by caller */
559out:
560 kfree(name);
561
562 return profile;
563
564fail:
565 aa_free_profile(profile);
566 return NULL;
567}
568
569/**
John Johansenc88d4c72010-07-29 14:48:00 -0700570 * replacement_allowed - test to see if replacement is allowed
571 * @profile: profile to test if it can be replaced (MAYBE NULL)
572 * @noreplace: true if replacement shouldn't be allowed but addition is okay
573 * @info: Returns - info about why replacement failed (NOT NULL)
574 *
575 * Returns: %0 if replacement allowed else error code
576 */
577static int replacement_allowed(struct aa_profile *profile, int noreplace,
578 const char **info)
579{
580 if (profile) {
John Johansen637f6882017-06-09 08:14:28 -0700581 if (profile->label.flags & FLAG_IMMUTIBLE) {
John Johansenc88d4c72010-07-29 14:48:00 -0700582 *info = "cannot replace immutible profile";
583 return -EPERM;
584 } else if (noreplace) {
585 *info = "profile already exists";
586 return -EEXIST;
587 }
588 }
589 return 0;
590}
591
John Johansenfc1c9fd2017-01-16 00:42:54 -0800592/* audit callback for net specific fields */
593static void audit_cb(struct audit_buffer *ab, void *va)
594{
595 struct common_audit_data *sa = va;
596
John Johansenef88a7a2017-01-16 00:43:02 -0800597 if (aad(sa)->iface.ns) {
John Johansenfc1c9fd2017-01-16 00:42:54 -0800598 audit_log_format(ab, " ns=");
John Johansenef88a7a2017-01-16 00:43:02 -0800599 audit_log_untrustedstring(ab, aad(sa)->iface.ns);
John Johansenfc1c9fd2017-01-16 00:42:54 -0800600 }
601}
602
John Johansenc88d4c72010-07-29 14:48:00 -0700603/**
John Johansen637f6882017-06-09 08:14:28 -0700604 * audit_policy - Do auditing of policy changes
605 * @label: label to check if it can manage policy
John Johansenc88d4c72010-07-29 14:48:00 -0700606 * @op: policy operation being performed
John Johansen637f6882017-06-09 08:14:28 -0700607 * @ns_name: name of namespace being manipulated
John Johansenc88d4c72010-07-29 14:48:00 -0700608 * @name: name of profile being manipulated (NOT NULL)
609 * @info: any extra information to be audited (MAYBE NULL)
610 * @error: error code
611 *
612 * Returns: the error to be returned after audit is done
613 */
John Johansen637f6882017-06-09 08:14:28 -0700614static int audit_policy(struct aa_label *label, const char *op,
615 const char *ns_name, const char *name,
John Johansenfc1c9fd2017-01-16 00:42:54 -0800616 const char *info, int error)
John Johansenc88d4c72010-07-29 14:48:00 -0700617{
John Johansenef88a7a2017-01-16 00:43:02 -0800618 DEFINE_AUDIT_DATA(sa, LSM_AUDIT_DATA_NONE, op);
John Johansenc88d4c72010-07-29 14:48:00 -0700619
John Johansen637f6882017-06-09 08:14:28 -0700620 aad(&sa)->iface.ns = ns_name;
John Johansenef88a7a2017-01-16 00:43:02 -0800621 aad(&sa)->name = name;
622 aad(&sa)->info = info;
623 aad(&sa)->error = error;
John Johansen637f6882017-06-09 08:14:28 -0700624 aad(&sa)->label = label;
John Johansenef88a7a2017-01-16 00:43:02 -0800625
John Johansen637f6882017-06-09 08:14:28 -0700626 aa_audit_msg(AUDIT_APPARMOR_STATUS, &sa, audit_cb);
627
628 return error;
John Johansenc88d4c72010-07-29 14:48:00 -0700629}
630
John Johansen2bd8dbb2017-01-16 00:42:50 -0800631/**
632 * policy_view_capable - check if viewing policy in at @ns is allowed
633 * ns: namespace being viewed by current task (may be NULL)
634 * Returns: true if viewing policy is allowed
635 *
636 * If @ns is NULL then the namespace being viewed is assumed to be the
637 * tasks current namespace.
638 */
639bool policy_view_capable(struct aa_ns *ns)
John Johansen58acf9d2016-06-22 18:01:08 -0700640{
641 struct user_namespace *user_ns = current_user_ns();
John Johansen2bd8dbb2017-01-16 00:42:50 -0800642 struct aa_ns *view_ns = aa_get_current_ns();
643 bool root_in_user_ns = uid_eq(current_euid(), make_kuid(user_ns, 0)) ||
644 in_egroup_p(make_kgid(user_ns, 0));
John Johansen58acf9d2016-06-22 18:01:08 -0700645 bool response = false;
John Johansen2bd8dbb2017-01-16 00:42:50 -0800646 if (!ns)
647 ns = view_ns;
John Johansen58acf9d2016-06-22 18:01:08 -0700648
John Johansen2bd8dbb2017-01-16 00:42:50 -0800649 if (root_in_user_ns && aa_ns_visible(view_ns, ns, true) &&
650 (user_ns == &init_user_ns ||
651 (unprivileged_userns_apparmor_policy != 0 &&
652 user_ns->level == view_ns->level)))
John Johansen58acf9d2016-06-22 18:01:08 -0700653 response = true;
John Johansen2bd8dbb2017-01-16 00:42:50 -0800654 aa_put_ns(view_ns);
John Johansen58acf9d2016-06-22 18:01:08 -0700655
656 return response;
657}
658
John Johansenfd2a8042017-01-16 00:42:51 -0800659bool policy_admin_capable(struct aa_ns *ns)
John Johansen58acf9d2016-06-22 18:01:08 -0700660{
John Johansenfd2a8042017-01-16 00:42:51 -0800661 struct user_namespace *user_ns = current_user_ns();
662 bool capable = ns_capable(user_ns, CAP_MAC_ADMIN);
663
664 AA_DEBUG("cap_mac_admin? %d\n", capable);
665 AA_DEBUG("policy locked? %d\n", aa_g_lock_policy);
666
667 return policy_view_capable(ns) && capable && !aa_g_lock_policy;
John Johansen58acf9d2016-06-22 18:01:08 -0700668}
669
John Johansenc88d4c72010-07-29 14:48:00 -0700670/**
671 * aa_may_manage_policy - can the current task manage policy
John Johansen637f6882017-06-09 08:14:28 -0700672 * @label: label to check if it can manage policy
John Johansenc88d4c72010-07-29 14:48:00 -0700673 * @op: the policy manipulation operation being done
674 *
John Johansen078c73c62017-01-16 00:42:52 -0800675 * Returns: 0 if the task is allowed to manipulate policy else error
John Johansenc88d4c72010-07-29 14:48:00 -0700676 */
John Johansen637f6882017-06-09 08:14:28 -0700677int aa_may_manage_policy(struct aa_label *label, struct aa_ns *ns, u32 mask)
John Johansenc88d4c72010-07-29 14:48:00 -0700678{
John Johansen18e99f12017-05-26 01:45:08 -0700679 const char *op;
680
681 if (mask & AA_MAY_REMOVE_POLICY)
682 op = OP_PROF_RM;
683 else if (mask & AA_MAY_REPLACE_POLICY)
684 op = OP_PROF_REPL;
685 else
686 op = OP_PROF_LOAD;
687
John Johansenc88d4c72010-07-29 14:48:00 -0700688 /* check if loading policy is locked out */
John Johansen078c73c62017-01-16 00:42:52 -0800689 if (aa_g_lock_policy)
John Johansen637f6882017-06-09 08:14:28 -0700690 return audit_policy(label, op, NULL, NULL, "policy_locked",
John Johansen18e99f12017-05-26 01:45:08 -0700691 -EACCES);
John Johansenc88d4c72010-07-29 14:48:00 -0700692
John Johansen078c73c62017-01-16 00:42:52 -0800693 if (!policy_admin_capable(ns))
John Johansen637f6882017-06-09 08:14:28 -0700694 return audit_policy(label, op, NULL, NULL, "not policy admin",
John Johansen18e99f12017-05-26 01:45:08 -0700695 -EACCES);
John Johansenc88d4c72010-07-29 14:48:00 -0700696
John Johansen078c73c62017-01-16 00:42:52 -0800697 /* TODO: add fine grained mediation of policy loads */
698 return 0;
John Johansenc88d4c72010-07-29 14:48:00 -0700699}
700
John Johansendd51c8482013-07-10 21:05:43 -0700701static struct aa_profile *__list_lookup_parent(struct list_head *lh,
702 struct aa_profile *profile)
703{
John Johansen6e474e32017-01-16 00:42:29 -0800704 const char *base = basename(profile->base.hname);
John Johansendd51c8482013-07-10 21:05:43 -0700705 long len = base - profile->base.hname;
706 struct aa_load_ent *ent;
707
708 /* parent won't have trailing // so remove from len */
709 if (len <= 2)
710 return NULL;
711 len -= 2;
712
713 list_for_each_entry(ent, lh, list) {
714 if (ent->new == profile)
715 continue;
716 if (strncmp(ent->new->base.hname, profile->base.hname, len) ==
717 0 && ent->new->base.hname[len] == 0)
718 return ent->new;
719 }
720
721 return NULL;
722}
723
724/**
725 * __replace_profile - replace @old with @new on a list
726 * @old: profile to be replaced (NOT NULL)
727 * @new: profile to replace @old with (NOT NULL)
John Johansen83995882017-01-16 00:42:19 -0800728 * @share_proxy: transfer @old->proxy to @new
John Johansendd51c8482013-07-10 21:05:43 -0700729 *
730 * Will duplicate and refcount elements that @new inherits from @old
731 * and will inherit @old children.
732 *
733 * refcount @new for list, put @old list refcount
734 *
735 * Requires: namespace list lock be held, or list not be shared
736 */
John Johansen637f6882017-06-09 08:14:28 -0700737static void __replace_profile(struct aa_profile *old, struct aa_profile *new)
John Johansendd51c8482013-07-10 21:05:43 -0700738{
739 struct aa_profile *child, *tmp;
740
741 if (!list_empty(&old->base.profiles)) {
742 LIST_HEAD(lh);
John Johansen01e2b672013-07-10 21:06:43 -0700743 list_splice_init_rcu(&old->base.profiles, &lh, synchronize_rcu);
John Johansendd51c8482013-07-10 21:05:43 -0700744
745 list_for_each_entry_safe(child, tmp, &lh, base.list) {
746 struct aa_profile *p;
747
748 list_del_init(&child->base.list);
749 p = __find_child(&new->base.profiles, child->base.name);
750 if (p) {
751 /* @p replaces @child */
John Johansen637f6882017-06-09 08:14:28 -0700752 __replace_profile(child, p);
John Johansendd51c8482013-07-10 21:05:43 -0700753 continue;
754 }
755
756 /* inherit @child and its children */
757 /* TODO: update hname of inherited children */
758 /* list refcount transferred to @new */
John Johansen0d259f02013-07-10 21:13:43 -0700759 p = aa_deref_parent(child);
John Johansen01e2b672013-07-10 21:06:43 -0700760 rcu_assign_pointer(child->parent, aa_get_profile(new));
761 list_add_rcu(&child->base.list, &new->base.profiles);
762 aa_put_profile(p);
John Johansendd51c8482013-07-10 21:05:43 -0700763 }
764 }
765
John Johansen01e2b672013-07-10 21:06:43 -0700766 if (!rcu_access_pointer(new->parent)) {
John Johansen0d259f02013-07-10 21:13:43 -0700767 struct aa_profile *parent = aa_deref_parent(old);
John Johansen01e2b672013-07-10 21:06:43 -0700768 rcu_assign_pointer(new->parent, aa_get_profile(parent));
769 }
John Johansen637f6882017-06-09 08:14:28 -0700770 aa_label_replace(&old->label, &new->label);
771 /* migrate dents must come after label replacement b/c update */
John Johansenc97204b2017-05-25 06:23:42 -0700772 __aafs_profile_migrate_dents(old, new);
John Johansendd51c8482013-07-10 21:05:43 -0700773
774 if (list_empty(&new->base.list)) {
775 /* new is not on a list already */
John Johansen01e2b672013-07-10 21:06:43 -0700776 list_replace_rcu(&old->base.list, &new->base.list);
John Johansendd51c8482013-07-10 21:05:43 -0700777 aa_get_profile(new);
778 aa_put_profile(old);
779 } else
780 __list_remove_profile(old);
781}
782
783/**
784 * __lookup_replace - lookup replacement information for a profile
785 * @ns - namespace the lookup occurs in
786 * @hname - name of profile to lookup
787 * @noreplace - true if not replacing an existing profile
788 * @p - Returns: profile to be replaced
789 * @info - Returns: info string on why lookup failed
790 *
791 * Returns: profile to replace (no ref) on success else ptr error
792 */
John Johansen98849df2017-01-16 00:42:16 -0800793static int __lookup_replace(struct aa_ns *ns, const char *hname,
John Johansendd51c8482013-07-10 21:05:43 -0700794 bool noreplace, struct aa_profile **p,
795 const char **info)
796{
797 *p = aa_get_profile(__lookup_profile(&ns->base, hname));
798 if (*p) {
799 int error = replacement_allowed(*p, noreplace, info);
800 if (error) {
801 *info = "profile can not be replaced";
802 return error;
803 }
804 }
805
806 return 0;
807}
808
John Johansena1bd6272017-06-09 07:09:05 -0700809static void share_name(struct aa_profile *old, struct aa_profile *new)
810{
811 aa_put_str(new->base.hname);
812 aa_get_str(old->base.hname);
813 new->base.hname = old->base.hname;
814 new->base.name = old->base.name;
John Johansen637f6882017-06-09 08:14:28 -0700815 new->label.hname = old->label.hname;
John Johansena1bd6272017-06-09 07:09:05 -0700816}
817
John Johansen435222b2017-06-09 07:16:46 -0700818/* Update to newest version of parent after previous replacements
819 * Returns: unrefcount newest version of parent
820 */
821static struct aa_profile *update_to_newest_parent(struct aa_profile *new)
822{
823 struct aa_profile *parent, *newest;
824
825 parent = rcu_dereference_protected(new->parent,
826 mutex_is_locked(&new->ns->lock));
827 newest = aa_get_newest_profile(parent);
828
829 /* parent replaced in this atomic set? */
830 if (newest != parent) {
831 aa_put_profile(parent);
832 rcu_assign_pointer(new->parent, newest);
833 } else
834 aa_put_profile(newest);
835
836 return newest;
837}
838
John Johansenc88d4c72010-07-29 14:48:00 -0700839/**
840 * aa_replace_profiles - replace profile(s) on the profile list
John Johansen60285eb2017-06-04 12:22:22 -0700841 * @policy_ns: namespace load is occurring on
John Johansen12dd7172017-01-16 00:42:57 -0800842 * @label: label that is attempting to load/replace policy
John Johansen18e99f12017-05-26 01:45:08 -0700843 * @mask: permission mask
John Johansen5ac8c352017-01-16 00:42:55 -0800844 * @udata: serialized data stream (NOT NULL)
John Johansenc88d4c72010-07-29 14:48:00 -0700845 *
846 * unpack and replace a profile on the profile list and uses of that profile
John Johansen55a26eb2017-01-16 00:43:00 -0800847 * by any aa_task_ctx. If the profile does not exist on the profile list
John Johansenc88d4c72010-07-29 14:48:00 -0700848 * it is added.
849 *
850 * Returns: size of data consumed else error code on failure.
851 */
John Johansen637f6882017-06-09 08:14:28 -0700852ssize_t aa_replace_profiles(struct aa_ns *policy_ns, struct aa_label *label,
John Johansen18e99f12017-05-26 01:45:08 -0700853 u32 mask, struct aa_loaddata *udata)
John Johansenc88d4c72010-07-29 14:48:00 -0700854{
John Johansenbf15cf02016-04-16 14:16:50 -0700855 const char *ns_name, *info = NULL;
John Johansen98849df2017-01-16 00:42:16 -0800856 struct aa_ns *ns = NULL;
John Johansendd51c8482013-07-10 21:05:43 -0700857 struct aa_load_ent *ent, *tmp;
John Johansen5d5182ca2017-05-09 00:08:41 -0700858 struct aa_loaddata *rawdata_ent;
John Johansen18e99f12017-05-26 01:45:08 -0700859 const char *op;
John Johansen04dc7152017-01-16 00:42:56 -0800860 ssize_t count, error;
John Johansendd51c8482013-07-10 21:05:43 -0700861 LIST_HEAD(lh);
John Johansenc88d4c72010-07-29 14:48:00 -0700862
John Johansen18e99f12017-05-26 01:45:08 -0700863 op = mask & AA_MAY_REPLACE_POLICY ? OP_PROF_REPL : OP_PROF_LOAD;
John Johansen5d5182ca2017-05-09 00:08:41 -0700864 aa_get_loaddata(udata);
John Johansenc88d4c72010-07-29 14:48:00 -0700865 /* released below */
John Johansen5ac8c352017-01-16 00:42:55 -0800866 error = aa_unpack(udata, &lh, &ns_name);
John Johansendd51c8482013-07-10 21:05:43 -0700867 if (error)
868 goto out;
John Johansenc88d4c72010-07-29 14:48:00 -0700869
John Johansen04dc7152017-01-16 00:42:56 -0800870 /* ensure that profiles are all for the same ns
871 * TODO: update locking to remove this constaint. All profiles in
872 * the load set must succeed as a set or the load will
873 * fail. Sort ent list and take ns locks in hierarchy order
874 */
875 count = 0;
876 list_for_each_entry(ent, &lh, list) {
877 if (ns_name) {
878 if (ent->ns_name &&
879 strcmp(ent->ns_name, ns_name) != 0) {
880 info = "policy load has mixed namespaces";
881 error = -EACCES;
882 goto fail;
883 }
884 } else if (ent->ns_name) {
885 if (count) {
886 info = "policy load has mixed namespaces";
887 error = -EACCES;
888 goto fail;
889 }
890 ns_name = ent->ns_name;
891 } else
892 count++;
John Johansenc88d4c72010-07-29 14:48:00 -0700893 }
John Johansen04dc7152017-01-16 00:42:56 -0800894 if (ns_name) {
John Johansen637f6882017-06-09 08:14:28 -0700895 ns = aa_prepare_ns(policy_ns ? policy_ns : labels_ns(label),
John Johansen60285eb2017-06-04 12:22:22 -0700896 ns_name);
John Johansen04dc7152017-01-16 00:42:56 -0800897 if (IS_ERR(ns)) {
John Johansenb9b144b2017-04-06 06:55:22 -0700898 op = OP_PROF_LOAD;
John Johansen04dc7152017-01-16 00:42:56 -0800899 info = "failed to prepare namespace";
900 error = PTR_ERR(ns);
901 ns = NULL;
John Johansenb9b144b2017-04-06 06:55:22 -0700902 ent = NULL;
John Johansen04dc7152017-01-16 00:42:56 -0800903 goto fail;
904 }
905 } else
John Johansen637f6882017-06-09 08:14:28 -0700906 ns = aa_get_ns(policy_ns ? policy_ns : labels_ns(label));
John Johansenc88d4c72010-07-29 14:48:00 -0700907
John Johansen01e2b672013-07-10 21:06:43 -0700908 mutex_lock(&ns->lock);
John Johansen5d5182ca2017-05-09 00:08:41 -0700909 /* check for duplicate rawdata blobs: space and file dedup */
910 list_for_each_entry(rawdata_ent, &ns->rawdata_list, list) {
911 if (aa_rawdata_eq(rawdata_ent, udata)) {
912 struct aa_loaddata *tmp;
913
914 tmp = __aa_get_loaddata(rawdata_ent);
915 /* check we didn't fail the race */
916 if (tmp) {
917 aa_put_loaddata(udata);
918 udata = tmp;
919 break;
920 }
921 }
922 }
John Johansendd51c8482013-07-10 21:05:43 -0700923 /* setup parent and ns info */
924 list_for_each_entry(ent, &lh, list) {
925 struct aa_policy *policy;
John Johansen5d5182ca2017-05-09 00:08:41 -0700926
John Johansen5ac8c352017-01-16 00:42:55 -0800927 ent->new->rawdata = aa_get_loaddata(udata);
John Johansen18e99f12017-05-26 01:45:08 -0700928 error = __lookup_replace(ns, ent->new->base.hname,
929 !(mask & AA_MAY_REPLACE_POLICY),
John Johansendd51c8482013-07-10 21:05:43 -0700930 &ent->old, &info);
931 if (error)
932 goto fail_lock;
John Johansenc88d4c72010-07-29 14:48:00 -0700933
John Johansendd51c8482013-07-10 21:05:43 -0700934 if (ent->new->rename) {
935 error = __lookup_replace(ns, ent->new->rename,
John Johansen637f6882017-06-09 08:14:28 -0700936 !(mask & AA_MAY_REPLACE_POLICY),
937 &ent->rename, &info);
John Johansendd51c8482013-07-10 21:05:43 -0700938 if (error)
939 goto fail_lock;
John Johansenc88d4c72010-07-29 14:48:00 -0700940 }
John Johansendd51c8482013-07-10 21:05:43 -0700941
942 /* released when @new is freed */
John Johansen98849df2017-01-16 00:42:16 -0800943 ent->new->ns = aa_get_ns(ns);
John Johansendd51c8482013-07-10 21:05:43 -0700944
945 if (ent->old || ent->rename)
946 continue;
947
948 /* no ref on policy only use inside lock */
949 policy = __lookup_parent(ns, ent->new->base.hname);
950 if (!policy) {
951 struct aa_profile *p;
952 p = __list_lookup_parent(&lh, ent->new);
953 if (!p) {
954 error = -ENOENT;
955 info = "parent does not exist";
John Johansendd51c8482013-07-10 21:05:43 -0700956 goto fail_lock;
957 }
John Johansen01e2b672013-07-10 21:06:43 -0700958 rcu_assign_pointer(ent->new->parent, aa_get_profile(p));
959 } else if (policy != &ns->base) {
John Johansendd51c8482013-07-10 21:05:43 -0700960 /* released on profile replacement or free_profile */
John Johansen01e2b672013-07-10 21:06:43 -0700961 struct aa_profile *p = (struct aa_profile *) policy;
962 rcu_assign_pointer(ent->new->parent, aa_get_profile(p));
963 }
John Johansenc88d4c72010-07-29 14:48:00 -0700964 }
965
John Johansen0d259f02013-07-10 21:13:43 -0700966 /* create new fs entries for introspection if needed */
John Johansen5d5182ca2017-05-09 00:08:41 -0700967 if (!udata->dents[AAFS_LOADDATA_DIR]) {
968 error = __aa_fs_create_rawdata(ns, udata);
969 if (error) {
970 info = "failed to create raw_data dir and files";
971 ent = NULL;
972 goto fail_lock;
973 }
974 }
John Johansen0d259f02013-07-10 21:13:43 -0700975 list_for_each_entry(ent, &lh, list) {
John Johansendca91402017-06-09 07:24:18 -0700976 if (!ent->old) {
John Johansen0d259f02013-07-10 21:13:43 -0700977 struct dentry *parent;
978 if (rcu_access_pointer(ent->new->parent)) {
979 struct aa_profile *p;
980 p = aa_deref_parent(ent->new);
981 parent = prof_child_dir(p);
982 } else
983 parent = ns_subprofs_dir(ent->new->ns);
John Johansenc97204b2017-05-25 06:23:42 -0700984 error = __aafs_profile_mkdir(ent->new, parent);
John Johansen0d259f02013-07-10 21:13:43 -0700985 }
986
987 if (error) {
John Johansendca91402017-06-09 07:24:18 -0700988 info = "failed to create";
John Johansen0d259f02013-07-10 21:13:43 -0700989 goto fail_lock;
990 }
991 }
992
993 /* Done with checks that may fail - do actual replacement */
John Johansen5d5182ca2017-05-09 00:08:41 -0700994 __aa_bump_ns_revision(ns);
995 __aa_loaddata_update(udata, ns->revision);
John Johansendd51c8482013-07-10 21:05:43 -0700996 list_for_each_entry_safe(ent, tmp, &lh, list) {
997 list_del_init(&ent->list);
998 op = (!ent->old && !ent->rename) ? OP_PROF_LOAD : OP_PROF_REPL;
John Johansenc88d4c72010-07-29 14:48:00 -0700999
John Johansen5d5182ca2017-05-09 00:08:41 -07001000 if (ent->old && ent->old->rawdata == ent->new->rawdata) {
1001 /* dedup actual profile replacement */
John Johansen637f6882017-06-09 08:14:28 -07001002 audit_policy(label, op, ns_name, ent->new->base.hname,
John Johansen5d5182ca2017-05-09 00:08:41 -07001003 "same as current profile, skipping",
1004 error);
1005 goto skip;
1006 }
1007
1008 /*
1009 * TODO: finer dedup based on profile range in data. Load set
1010 * can differ but profile may remain unchanged
1011 */
John Johansen637f6882017-06-09 08:14:28 -07001012 audit_policy(label, op, ns_name, ent->new->base.hname, NULL,
1013 error);
John Johansenc88d4c72010-07-29 14:48:00 -07001014
John Johansendd51c8482013-07-10 21:05:43 -07001015 if (ent->old) {
John Johansena1bd6272017-06-09 07:09:05 -07001016 share_name(ent->old, ent->new);
John Johansen637f6882017-06-09 08:14:28 -07001017 __replace_profile(ent->old, ent->new);
John Johansen0d259f02013-07-10 21:13:43 -07001018 } else {
John Johansen435222b2017-06-09 07:16:46 -07001019 struct list_head *lh;
1020
1021 if (rcu_access_pointer(ent->new->parent)) {
1022 struct aa_profile *parent;
1023
1024 parent = update_to_newest_parent(ent->new);
1025 lh = &parent->base.profiles;
1026 } else
1027 lh = &ns->base.profiles;
John Johansen637f6882017-06-09 08:14:28 -07001028 __add_profile(lh, ent->new);
John Johansen0d259f02013-07-10 21:13:43 -07001029 }
John Johansen5d5182ca2017-05-09 00:08:41 -07001030 skip:
John Johansendd51c8482013-07-10 21:05:43 -07001031 aa_load_ent_free(ent);
John Johansenc88d4c72010-07-29 14:48:00 -07001032 }
John Johansen637f6882017-06-09 08:14:28 -07001033 __aa_labelset_update_subtree(ns);
John Johansen01e2b672013-07-10 21:06:43 -07001034 mutex_unlock(&ns->lock);
John Johansenc88d4c72010-07-29 14:48:00 -07001035
1036out:
John Johansen98849df2017-01-16 00:42:16 -08001037 aa_put_ns(ns);
John Johansen5d5182ca2017-05-09 00:08:41 -07001038 aa_put_loaddata(udata);
John Johansendd51c8482013-07-10 21:05:43 -07001039
John Johansenc88d4c72010-07-29 14:48:00 -07001040 if (error)
1041 return error;
John Johansen5ac8c352017-01-16 00:42:55 -08001042 return udata->size;
John Johansenc88d4c72010-07-29 14:48:00 -07001043
John Johansendd51c8482013-07-10 21:05:43 -07001044fail_lock:
John Johansen01e2b672013-07-10 21:06:43 -07001045 mutex_unlock(&ns->lock);
John Johansendd51c8482013-07-10 21:05:43 -07001046
John Johansenbf15cf02016-04-16 14:16:50 -07001047 /* audit cause of failure */
John Johansen5d5182ca2017-05-09 00:08:41 -07001048 op = (ent && !ent->old) ? OP_PROF_LOAD : OP_PROF_REPL;
John Johansen04dc7152017-01-16 00:42:56 -08001049fail:
John Johansen637f6882017-06-09 08:14:28 -07001050 audit_policy(label, op, ns_name, ent ? ent->new->base.hname : NULL,
1051 info, error);
John Johansenbf15cf02016-04-16 14:16:50 -07001052 /* audit status that rest of profiles in the atomic set failed too */
1053 info = "valid profile in failed atomic policy load";
1054 list_for_each_entry(tmp, &lh, list) {
1055 if (tmp == ent) {
1056 info = "unchecked profile in failed atomic policy load";
1057 /* skip entry that caused failure */
1058 continue;
1059 }
John Johansenb9b144b2017-04-06 06:55:22 -07001060 op = (!tmp->old) ? OP_PROF_LOAD : OP_PROF_REPL;
John Johansen637f6882017-06-09 08:14:28 -07001061 audit_policy(label, op, ns_name, tmp->new->base.hname, info,
1062 error);
John Johansenbf15cf02016-04-16 14:16:50 -07001063 }
John Johansendd51c8482013-07-10 21:05:43 -07001064 list_for_each_entry_safe(ent, tmp, &lh, list) {
1065 list_del_init(&ent->list);
1066 aa_load_ent_free(ent);
1067 }
1068
John Johansenc88d4c72010-07-29 14:48:00 -07001069 goto out;
1070}
1071
1072/**
1073 * aa_remove_profiles - remove profile(s) from the system
John Johansen60285eb2017-06-04 12:22:22 -07001074 * @policy_ns: namespace the remove is being done from
John Johansen637f6882017-06-09 08:14:28 -07001075 * @subj: label attempting to remove policy
John Johansenc88d4c72010-07-29 14:48:00 -07001076 * @fqname: name of the profile or namespace to remove (NOT NULL)
1077 * @size: size of the name
1078 *
1079 * Remove a profile or sub namespace from the current namespace, so that
1080 * they can not be found anymore and mark them as replaced by unconfined
1081 *
1082 * NOTE: removing confinement does not restore rlimits to preconfinemnet values
1083 *
1084 * Returns: size of data consume else error code if fails
1085 */
John Johansen637f6882017-06-09 08:14:28 -07001086ssize_t aa_remove_profiles(struct aa_ns *policy_ns, struct aa_label *subj,
John Johansen12dd7172017-01-16 00:42:57 -08001087 char *fqname, size_t size)
John Johansenc88d4c72010-07-29 14:48:00 -07001088{
John Johansen60285eb2017-06-04 12:22:22 -07001089 struct aa_ns *ns = NULL;
John Johansenc88d4c72010-07-29 14:48:00 -07001090 struct aa_profile *profile = NULL;
1091 const char *name = fqname, *info = NULL;
John Johansen36642682017-06-02 17:44:27 -07001092 const char *ns_name = NULL;
John Johansenc88d4c72010-07-29 14:48:00 -07001093 ssize_t error = 0;
1094
1095 if (*fqname == 0) {
1096 info = "no profile specified";
1097 error = -ENOENT;
1098 goto fail;
1099 }
1100
John Johansenc88d4c72010-07-29 14:48:00 -07001101 if (fqname[0] == ':') {
John Johansen36642682017-06-02 17:44:27 -07001102 size_t ns_len;
1103
1104 name = aa_splitn_fqname(fqname, size, &ns_name, &ns_len);
John Johansen41d1b3e2013-02-21 01:14:17 -08001105 /* released below */
John Johansen637f6882017-06-09 08:14:28 -07001106 ns = aa_lookupn_ns(policy_ns ? policy_ns : labels_ns(subj),
1107 ns_name, ns_len);
John Johansen41d1b3e2013-02-21 01:14:17 -08001108 if (!ns) {
1109 info = "namespace does not exist";
1110 error = -ENOENT;
1111 goto fail;
John Johansenc88d4c72010-07-29 14:48:00 -07001112 }
1113 } else
1114 /* released below */
John Johansen637f6882017-06-09 08:14:28 -07001115 ns = aa_get_ns(policy_ns ? policy_ns : labels_ns(subj));
John Johansenc88d4c72010-07-29 14:48:00 -07001116
John Johansenc88d4c72010-07-29 14:48:00 -07001117 if (!name) {
1118 /* remove namespace - can only happen if fqname[0] == ':' */
John Johansen01e2b672013-07-10 21:06:43 -07001119 mutex_lock(&ns->parent->lock);
John Johansen98849df2017-01-16 00:42:16 -08001120 __aa_remove_ns(ns);
John Johansen5d5182ca2017-05-09 00:08:41 -07001121 __aa_bump_ns_revision(ns);
John Johansen01e2b672013-07-10 21:06:43 -07001122 mutex_unlock(&ns->parent->lock);
John Johansenc88d4c72010-07-29 14:48:00 -07001123 } else {
1124 /* remove profile */
John Johansen01e2b672013-07-10 21:06:43 -07001125 mutex_lock(&ns->lock);
John Johansenc88d4c72010-07-29 14:48:00 -07001126 profile = aa_get_profile(__lookup_profile(&ns->base, name));
1127 if (!profile) {
1128 error = -ENOENT;
1129 info = "profile does not exist";
1130 goto fail_ns_lock;
1131 }
1132 name = profile->base.hname;
1133 __remove_profile(profile);
John Johansen637f6882017-06-09 08:14:28 -07001134 __aa_labelset_update_subtree(ns);
John Johansen5d5182ca2017-05-09 00:08:41 -07001135 __aa_bump_ns_revision(ns);
John Johansen01e2b672013-07-10 21:06:43 -07001136 mutex_unlock(&ns->lock);
John Johansenc88d4c72010-07-29 14:48:00 -07001137 }
John Johansenc88d4c72010-07-29 14:48:00 -07001138
1139 /* don't fail removal if audit fails */
John Johansenef88a7a2017-01-16 00:43:02 -08001140 (void) audit_policy(subj, OP_PROF_RM, ns_name, name, info,
John Johansen12dd7172017-01-16 00:42:57 -08001141 error);
John Johansen98849df2017-01-16 00:42:16 -08001142 aa_put_ns(ns);
John Johansenc88d4c72010-07-29 14:48:00 -07001143 aa_put_profile(profile);
1144 return size;
1145
1146fail_ns_lock:
John Johansen01e2b672013-07-10 21:06:43 -07001147 mutex_unlock(&ns->lock);
John Johansen98849df2017-01-16 00:42:16 -08001148 aa_put_ns(ns);
John Johansenc88d4c72010-07-29 14:48:00 -07001149
1150fail:
John Johansenef88a7a2017-01-16 00:43:02 -08001151 (void) audit_policy(subj, OP_PROF_RM, ns_name, name, info,
John Johansen12dd7172017-01-16 00:42:57 -08001152 error);
John Johansenc88d4c72010-07-29 14:48:00 -07001153 return error;
1154}