2 * AppArmor security module
4 * This file contains AppArmor policy manipulation functions
6 * Copyright (C) 1998-2008 Novell/SUSE
7 * Copyright 2009-2010 Canonical Ltd.
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
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.
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.
24 * Namespace and profile names can be written together in either
26 * :namespace:profile - used by kernel interfaces for easy detection
27 * namespace://profile - used by policy
29 * Profile names can not start with : or @ or ^ and may not contain \0
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
36 * Namespace names may not start with / or @ and may not contain \0 or :
37 * Reserved namespace names
38 * user-XXXX - user defined profiles
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.
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
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
67 * An fqname is a name that may contain both namespace and profile hnames.
68 * eg. :ns:/bin/bash//bin/ls
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
76 #include <linux/slab.h>
77 #include <linux/spinlock.h>
78 #include <linux/string.h>
79 #include <linux/user_namespace.h>
81 #include "include/apparmor.h"
82 #include "include/capability.h"
83 #include "include/context.h"
84 #include "include/file.h"
85 #include "include/ipc.h"
86 #include "include/label.h"
87 #include "include/match.h"
88 #include "include/path.h"
89 #include "include/policy.h"
90 #include "include/policy_ns.h"
91 #include "include/policy_unpack.h"
92 #include "include/resource.h"
94 int unprivileged_userns_apparmor_policy
= 1;
96 /* Note: mode names must be unique in the first character because of
97 * modechrs used to print modes on compound labels on some interfaces
99 const char *const aa_profile_mode_names
[] = {
107 * aa_free_data - free a data blob
111 static void aa_free_data(void *ptr
, void *arg
)
113 struct aa_data
*data
= ptr
;
121 * __add_profile - add a profiles to list and label tree
122 * @list: list to add it to (NOT NULL)
123 * @profile: the profile to add (NOT NULL)
125 * refcount @profile, should be put by __list_remove_profile
127 * Requires: namespace lock be held, or list not be shared
129 static void __add_profile(struct list_head
*list
, struct aa_profile
*profile
)
135 AA_BUG(!profile
->ns
);
136 AA_BUG(!mutex_is_locked(&profile
->ns
->lock
));
138 list_add_rcu(&profile
->base
.list
, list
);
139 /* get list reference */
140 aa_get_profile(profile
);
141 l
= aa_label_insert(&profile
->ns
->labels
, &profile
->label
);
142 AA_BUG(l
!= &profile
->label
);
147 * __list_remove_profile - remove a profile from the list it is on
148 * @profile: the profile to remove (NOT NULL)
150 * remove a profile from the list, warning generally removal should
151 * be done with __replace_profile as most profile removals are
152 * replacements to the unconfined profile.
154 * put @profile list refcount
156 * Requires: namespace lock be held, or list not have been live
158 static void __list_remove_profile(struct aa_profile
*profile
)
161 AA_BUG(!profile
->ns
);
162 AA_BUG(!mutex_is_locked(&profile
->ns
->lock
));
164 list_del_rcu(&profile
->base
.list
);
165 aa_put_profile(profile
);
168 void __aa_profile_list_release(struct list_head
*head
);
171 * __remove_profile - remove old profile, and children
172 * @profile: profile to be replaced (NOT NULL)
174 * Requires: namespace list lock be held, or list not be shared
176 static void __remove_profile(struct aa_profile
*profile
)
179 AA_BUG(!profile
->ns
);
180 AA_BUG(!mutex_is_locked(&profile
->ns
->lock
));
182 /* release any children lists first */
183 __aa_profile_list_release(&profile
->base
.profiles
);
184 /* released by free_profile */
185 aa_label_remove(&profile
->label
);
186 __aa_fs_profile_rmdir(profile
);
187 __list_remove_profile(profile
);
191 * __aa_profile_list_release - remove all profiles on the list and put refs
192 * @head: list of profiles (NOT NULL)
194 * Requires: namespace lock be held
196 void __aa_profile_list_release(struct list_head
*head
)
198 struct aa_profile
*profile
, *tmp
;
199 list_for_each_entry_safe(profile
, tmp
, head
, base
.list
)
200 __remove_profile(profile
);
205 * aa_free_profile - free a profile
206 * @profile: the profile to free (MAYBE NULL)
208 * Free a profile, its hats and null_profile. All references to the profile,
209 * its hats and null_profile must have been put.
211 * If the profile was referenced from a task context, free_profile() will
212 * be called from an rcu callback routine, so we must not sleep here.
214 void aa_free_profile(struct aa_profile
*profile
)
216 struct rhashtable
*rht
;
218 AA_DEBUG("%s(%p)\n", __func__
, profile
);
223 /* free children profiles */
224 aa_policy_destroy(&profile
->base
);
225 aa_put_profile(rcu_access_pointer(profile
->parent
));
227 aa_put_ns(profile
->ns
);
228 kzfree(profile
->rename
);
230 aa_free_file_rules(&profile
->file
);
231 aa_free_cap_rules(&profile
->caps
);
232 aa_free_net_rules(&profile
->net
);
233 aa_free_rlimit_rules(&profile
->rlimits
);
235 kzfree(profile
->dirname
);
236 aa_put_dfa(profile
->xmatch
);
237 aa_put_dfa(profile
->policy
.dfa
);
241 profile
->data
= NULL
;
242 rhashtable_free_and_destroy(rht
, aa_free_data
, NULL
);
246 kzfree(profile
->hash
);
247 aa_put_loaddata(profile
->rawdata
);
253 * aa_alloc_profile - allocate, initialize and return a new profile
254 * @hname: name of the profile (NOT NULL)
255 * @gfp: allocation type
257 * Returns: refcount profile or NULL on failure
259 struct aa_profile
*aa_alloc_profile(const char *hname
, struct aa_proxy
*proxy
,
262 struct aa_profile
*profile
;
264 /* freed by free_profile - usually through aa_put_profile */
265 profile
= kzalloc(sizeof(*profile
) + sizeof (struct aa_profile
*) * 2,
270 if (!aa_policy_init(&profile
->base
, NULL
, hname
, gfp
))
272 if (!aa_label_init(&profile
->label
, 1))
275 /* update being set needed by fs interface */
277 proxy
= aa_alloc_proxy(&profile
->label
, gfp
);
282 profile
->label
.proxy
= proxy
;
284 profile
->label
.hname
= profile
->base
.hname
;
285 profile
->label
.flags
|= FLAG_PROFILE
;
286 profile
->label
.vec
[0] = profile
;
288 /* refcount released by caller */
292 aa_free_profile(profile
);
298 * aa_null_profile - create or find a null-X learning profile
299 * @parent: profile that caused this profile to be created (NOT NULL)
300 * @hat: true if the null- learning profile is a hat
301 * @base: name to base the null profile off of
302 * @gfp: type of allocation
304 * Find/Create a null- complain mode profile used in learning mode. The
305 * name of the profile is unique and follows the format of parent//null-XXX.
306 * where XXX is based on the @name or if that fails or is not supplied
309 * null profiles are added to the profile list but the list does not
310 * hold a count on them so that they are automatically released when
313 * Returns: new refcounted profile else NULL on failure
315 struct aa_profile
*aa_null_profile(struct aa_profile
*parent
, bool hat
,
316 const char *base
, gfp_t gfp
)
318 struct aa_profile
*profile
;
324 name
= kmalloc(strlen(parent
->base
.hname
) + 8 + strlen(base
),
327 sprintf(name
, "%s//null-%s", parent
->base
.hname
, base
);
330 /* fall through to try shorter uniq */
333 name
= kmalloc(strlen(parent
->base
.hname
) + 2 + 7 + 8, gfp
);
336 sprintf(name
, "%s//null-%x", parent
->base
.hname
,
337 atomic_inc_return(&parent
->ns
->uniq_null
));
340 /* lookup to see if this is a dup creation */
341 profile
= aa_find_child(parent
, basename(name
));
345 profile
= aa_alloc_profile(name
, NULL
, gfp
);
349 profile
->mode
= APPARMOR_COMPLAIN
;
350 profile
->label
.flags
|= FLAG_NULL
;
352 profile
->label
.flags
|= FLAG_HAT
;
353 profile
->path_flags
= parent
->path_flags
;
355 /* released on free_profile */
356 rcu_assign_pointer(profile
->parent
, aa_get_profile(parent
));
357 profile
->ns
= aa_get_ns(parent
->ns
);
358 profile
->file
.dfa
= aa_get_dfa(nulldfa
);
359 profile
->policy
.dfa
= aa_get_dfa(nulldfa
);
361 mutex_lock(&profile
->ns
->lock
);
362 __add_profile(&parent
->base
.profiles
, profile
);
363 mutex_unlock(&profile
->ns
->lock
);
365 /* refcount released by caller */
371 aa_free_profile(profile
);
376 * aa_setup_default_label - create the initial default label
378 struct aa_label
*aa_setup_default_label(void)
380 struct aa_profile
*profile
= aa_alloc_profile("default", NULL
,
385 /* the default profile pretends to be unconfined until it is replaced */
386 profile
->label
.flags
|= FLAG_IX_ON_NAME_ERROR
| FLAG_UNCONFINED
;
387 profile
->mode
= APPARMOR_UNCONFINED
;
389 profile
->ns
= aa_get_ns(root_ns
);
391 __add_profile(&root_ns
->base
.profiles
, profile
);
393 return &profile
->label
;
396 /* TODO: profile accounting - setup in remove */
399 * __find_child - find a profile on @head list with a name matching @name
400 * @head: list to search (NOT NULL)
401 * @name: name of profile (NOT NULL)
403 * Requires: rcu_read_lock be held
405 * Returns: unrefcounted profile ptr, or NULL if not found
407 static struct aa_profile
*__find_child(struct list_head
*head
, const char *name
)
409 return (struct aa_profile
*)__policy_find(head
, name
);
413 * __strn_find_child - find a profile on @head list using substring of @name
414 * @head: list to search (NOT NULL)
415 * @name: name of profile (NOT NULL)
416 * @len: length of @name substring to match
418 * Requires: rcu_read_lock be held
420 * Returns: unrefcounted profile ptr, or NULL if not found
422 static struct aa_profile
*__strn_find_child(struct list_head
*head
,
423 const char *name
, int len
)
425 return (struct aa_profile
*)__policy_strn_find(head
, name
, len
);
429 * aa_find_child - find a profile by @name in @parent
430 * @parent: profile to search (NOT NULL)
431 * @name: profile name to search for (NOT NULL)
433 * Returns: a refcounted profile or NULL if not found
435 struct aa_profile
*aa_find_child(struct aa_profile
*parent
, const char *name
)
437 struct aa_profile
*profile
;
441 profile
= __find_child(&parent
->base
.profiles
, name
);
442 } while (profile
&& !aa_get_profile_not0(profile
));
445 /* refcount released by caller */
450 * __lookup_parent - lookup the parent of a profile of name @hname
451 * @ns: namespace to lookup profile in (NOT NULL)
452 * @hname: hierarchical profile name to find parent of (NOT NULL)
454 * Lookups up the parent of a fully qualified profile name, the profile
455 * that matches hname does not need to exist, in general this
456 * is used to load a new profile.
458 * Requires: rcu_read_lock be held
460 * Returns: unrefcounted policy or NULL if not found
462 static struct aa_policy
*__lookup_parent(struct aa_ns
*ns
, const char *hname
)
464 struct aa_policy
*policy
;
465 struct aa_profile
*profile
= NULL
;
470 for (split
= strstr(hname
, "//"); split
;) {
471 profile
= __strn_find_child(&policy
->profiles
, hname
,
475 policy
= &profile
->base
;
477 split
= strstr(hname
, "//");
481 return &profile
->base
;
485 * __lookupn_profile - lookup the profile matching @hname
486 * @base: base list to start looking up profile name from (NOT NULL)
487 * @hname: hierarchical profile name (NOT NULL)
488 * @n: length of @hname
490 * Requires: rcu_read_lock be held
492 * Returns: unrefcounted profile pointer or NULL if not found
494 * Do a relative name lookup, recursing through profile tree.
496 static struct aa_profile
*__lookupn_profile(struct aa_policy
*base
,
497 const char *hname
, size_t n
)
499 struct aa_profile
*profile
= NULL
;
502 for (split
= strnstr(hname
, "//", n
); split
;
503 split
= strnstr(hname
, "//", n
)) {
504 profile
= __strn_find_child(&base
->profiles
, hname
,
509 base
= &profile
->base
;
510 n
-= split
+ 2 - hname
;
515 return __strn_find_child(&base
->profiles
, hname
, n
);
519 static struct aa_profile
*__lookup_profile(struct aa_policy
*base
,
522 return __lookupn_profile(base
, hname
, strlen(hname
));
526 * aa_lookup_profile - find a profile by its full or partial name
527 * @ns: the namespace to start from (NOT NULL)
528 * @hname: name to do lookup on. Does not contain namespace prefix (NOT NULL)
531 * Returns: refcounted profile or NULL if not found
533 struct aa_profile
*aa_lookupn_profile(struct aa_ns
*ns
, const char *hname
,
536 struct aa_profile
*profile
;
540 profile
= __lookupn_profile(&ns
->base
, hname
, n
);
541 } while (profile
&& !aa_get_profile_not0(profile
));
544 /* the unconfined profile is not in the regular profile list */
545 if (!profile
&& strncmp(hname
, "unconfined", n
) == 0)
546 profile
= aa_get_newest_profile(ns
->unconfined
);
548 /* refcount released by caller */
552 struct aa_profile
*aa_lookup_profile(struct aa_ns
*ns
, const char *hname
)
554 return aa_lookupn_profile(ns
, hname
, strlen(hname
));
557 struct aa_profile
*aa_fqlookupn_profile(struct aa_label
*base
,
558 const char *fqname
, size_t n
)
560 struct aa_profile
*profile
;
562 const char *name
, *ns_name
;
565 name
= aa_splitn_fqname(fqname
, n
, &ns_name
, &ns_len
);
567 ns
= aa_findn_ns(labels_ns(base
), ns_name
, ns_len
);
571 ns
= aa_get_ns(labels_ns(base
));
574 profile
= aa_lookupn_profile(ns
, name
, n
- (name
- fqname
));
576 /* default profile for ns, currently unconfined */
577 profile
= aa_get_newest_profile(ns
->unconfined
);
586 * replacement_allowed - test to see if replacement is allowed
587 * @profile: profile to test if it can be replaced (MAYBE NULL)
588 * @noreplace: true if replacement shouldn't be allowed but addition is okay
589 * @info: Returns - info about why replacement failed (NOT NULL)
591 * Returns: %0 if replacement allowed else error code
593 static int replacement_allowed(struct aa_profile
*profile
, int noreplace
,
597 if (profile
->label
.flags
& FLAG_IMMUTIBLE
) {
598 *info
= "cannot replace immutible profile";
600 } else if (noreplace
) {
601 *info
= "profile already exists";
608 /* audit callback for net specific fields */
609 static void audit_cb(struct audit_buffer
*ab
, void *va
)
611 struct common_audit_data
*sa
= va
;
613 if (aad(sa
)->iface
.ns
) {
614 audit_log_format(ab
, " ns=");
615 audit_log_untrustedstring(ab
, aad(sa
)->iface
.ns
);
620 * audit_policy - Do auditing of policy changes
621 * @label: label to check if it can manage policy
622 * @op: policy operation being performed
623 * @profile: name of profile being manipulated (NOT NULL)
624 * @info: any extra information to be audited (MAYBE NULL)
627 * Returns: the error to be returned after audit is done
629 static int audit_policy(struct aa_label
*label
, const char *op
,
630 const char *ns_name
, const char *name
,
631 const char *info
, int error
)
633 DEFINE_AUDIT_DATA(sa
, LSM_AUDIT_DATA_NONE
, op
);
634 // aad(&sa)->op = op;
635 aad(&sa
)->iface
.ns
= ns_name
;
636 aad(&sa
)->name
= name
;
637 aad(&sa
)->info
= info
;
638 aad(&sa
)->error
= error
;
639 aad(&sa
)->label
= label
;
641 aa_audit_msg(AUDIT_APPARMOR_STATUS
, &sa
, audit_cb
);
647 * policy_view_capable - check if viewing policy in at @ns is allowed
648 * ns: namespace being viewed by current task (may be NULL)
649 * Returns: true if viewing policy is allowed
651 * If @ns is NULL then the namespace being viewed is assumed to be the
652 * tasks current namespace.
654 bool policy_view_capable(struct aa_ns
*ns
)
656 struct user_namespace
*user_ns
= current_user_ns();
657 struct aa_ns
*view_ns
= aa_get_current_ns();
658 bool root_in_user_ns
= uid_eq(current_euid(), make_kuid(user_ns
, 0)) ||
659 in_egroup_p(make_kgid(user_ns
, 0));
660 bool response
= false;
664 if (root_in_user_ns
&& aa_ns_visible(view_ns
, ns
, true) &&
665 (user_ns
== &init_user_ns
||
666 (unprivileged_userns_apparmor_policy
!= 0 &&
667 user_ns
->level
== view_ns
->level
)))
674 bool policy_admin_capable(struct aa_ns
*ns
)
676 struct user_namespace
*user_ns
= current_user_ns();
677 bool capable
= ns_capable(user_ns
, CAP_MAC_ADMIN
);
679 AA_DEBUG("cap_mac_admin? %d\n", capable
);
680 AA_DEBUG("policy locked? %d\n", aa_g_lock_policy
);
682 return policy_view_capable(ns
) && capable
&& !aa_g_lock_policy
;
686 * aa_may_manage_policy - can the current task manage policy
687 * @label: label to check if it can manage policy
688 * @op: the policy manipulation operation being done
690 * Returns: 0 if the task is allowed to manipulate policy else error
692 int aa_may_manage_policy(struct aa_label
*label
, struct aa_ns
*ns
, u32 mask
)
696 if (mask
& AA_MAY_REMOVE_POLICY
)
698 else if (mask
& AA_MAY_REPLACE_POLICY
)
703 /* check if loading policy is locked out */
704 if (aa_g_lock_policy
)
705 return audit_policy(label
, op
, NULL
, NULL
, "policy_locked",
708 if (!policy_admin_capable(ns
))
709 return audit_policy(label
, op
, NULL
, NULL
, "not policy admin",
712 /* TODO: add fine grained mediation of policy loads */
716 static struct aa_profile
*__list_lookup_parent(struct list_head
*lh
,
717 struct aa_profile
*profile
)
719 const char *base
= basename(profile
->base
.hname
);
720 long len
= base
- profile
->base
.hname
;
721 struct aa_load_ent
*ent
;
723 /* parent won't have trailing // so remove from len */
728 list_for_each_entry(ent
, lh
, list
) {
729 if (ent
->new == profile
)
731 if (strncmp(ent
->new->base
.hname
, profile
->base
.hname
, len
) ==
732 0 && ent
->new->base
.hname
[len
] == 0)
740 * __replace_profile - replace @old with @new on a list
741 * @old: profile to be replaced (NOT NULL)
742 * @new: profile to replace @old with (NOT NULL)
744 * Will duplicate and refcount elements that @new inherits from @old
745 * and will inherit @old children.
747 * refcount @new for list, put @old list refcount
749 * Requires: namespace list lock be held, or list not be shared
751 static void __replace_profile(struct aa_profile
*old
, struct aa_profile
*new)
753 struct aa_profile
*child
, *tmp
;
755 if (!list_empty(&old
->base
.profiles
)) {
757 list_splice_init_rcu(&old
->base
.profiles
, &lh
, synchronize_rcu
);
759 list_for_each_entry_safe(child
, tmp
, &lh
, base
.list
) {
760 struct aa_profile
*p
;
762 list_del_init(&child
->base
.list
);
763 p
= __find_child(&new->base
.profiles
, child
->base
.name
);
765 /* @p replaces @child */
766 __replace_profile(child
, p
);
770 /* inherit @child and its children */
771 /* TODO: update hname of inherited children */
772 /* list refcount transferred to @new */
773 p
= aa_deref_parent(child
);
774 rcu_assign_pointer(child
->parent
, aa_get_profile(new));
775 list_add_rcu(&child
->base
.list
, &new->base
.profiles
);
780 if (!rcu_access_pointer(new->parent
)) {
781 struct aa_profile
*parent
= aa_deref_parent(old
);
782 rcu_assign_pointer(new->parent
, aa_get_profile(parent
));
784 aa_label_replace(&old
->label
, &new->label
);
785 /* migrate dents must come after label replacement b/c update */
786 __aa_fs_profile_migrate_dents(old
, new);
788 if (list_empty(&new->base
.list
)) {
789 /* new is not on a list already */
790 list_replace_rcu(&old
->base
.list
, &new->base
.list
);
794 __list_remove_profile(old
);
798 * __lookup_replace - lookup replacement information for a profile
799 * @ns - namespace the lookup occurs in
800 * @hname - name of profile to lookup
801 * @noreplace - true if not replacing an existing profile
802 * @p - Returns: profile to be replaced
803 * @info - Returns: info string on why lookup failed
805 * Returns: profile to replace (no ref) on success else ptr error
807 static int __lookup_replace(struct aa_ns
*ns
, const char *hname
,
808 bool noreplace
, struct aa_profile
**p
,
811 *p
= aa_get_profile(__lookup_profile(&ns
->base
, hname
));
813 int error
= replacement_allowed(*p
, noreplace
, info
);
815 *info
= "profile can not be replaced";
823 static void share_name(struct aa_profile
*old
, struct aa_profile
*new)
825 aa_put_str(new->base
.hname
);
826 aa_get_str(old
->base
.hname
);
827 new->base
.hname
= old
->base
.hname
;
828 new->base
.name
= old
->base
.name
;
829 new->label
.hname
= old
->label
.hname
;
832 /* Update to newest version of parent after previous replacements
833 * Returns: unrefcount newest version of parent
835 static struct aa_profile
*update_to_newest_parent(struct aa_profile
*new)
837 struct aa_profile
*parent
, *newest
;
838 parent
= rcu_dereference_protected(new->parent
,
839 mutex_is_locked(&new->ns
->lock
));
840 newest
= aa_get_newest_profile(parent
);
842 /* parent replaced in this atomic set? */
843 if (newest
!= parent
) {
844 aa_put_profile(parent
);
845 rcu_assign_pointer(new->parent
, newest
);
847 aa_put_profile(newest
);
853 * aa_replace_profiles - replace profile(s) on the profile list
854 * @view: namespace load is viewed from
855 * @label: label that is attempting to load/replace policy
856 * @mask: permission mask
857 * @udata: serialized data stream (NOT NULL)
859 * unpack and replace a profile on the profile list and uses of that profile
860 * by any aa_task_ctx. If the profile does not exist on the profile list
863 * Returns: size of data consumed else error code on failure.
865 ssize_t
aa_replace_profiles(struct aa_ns
*view
, struct aa_label
*label
,
866 u32 mask
, struct aa_loaddata
*udata
)
868 const char *ns_name
, *info
= NULL
;
869 struct aa_ns
*ns
= NULL
;
870 struct aa_load_ent
*ent
, *tmp
;
871 const char *op
= mask
& AA_MAY_REPLACE_POLICY
? OP_PROF_REPL
: OP_PROF_LOAD
;
872 ssize_t count
, error
;
877 error
= aa_unpack(udata
, &lh
, &ns_name
);
881 /* ensure that profiles are all for the same ns
882 * TODO: update locking to remove this constaint. All profiles in
883 * the load set must succeed as a set or the load will
884 * fail. Sort ent list and take ns locks in hierarchy order
887 list_for_each_entry(ent
, &lh
, list
) {
890 strcmp(ent
->ns_name
, ns_name
) != 0) {
891 info
= "policy load has mixed namespaces";
895 } else if (ent
->ns_name
) {
897 info
= "policy load has mixed namespaces";
901 ns_name
= ent
->ns_name
;
906 ns
= aa_prepare_ns(view
, ns_name
);
908 info
= "failed to prepare namespace";
914 ns
= aa_get_ns(view
);
916 mutex_lock(&ns
->lock
);
917 /* setup parent and ns info */
918 list_for_each_entry(ent
, &lh
, list
) {
919 struct aa_policy
*policy
;
921 ent
->new->rawdata
= aa_get_loaddata(udata
);
922 error
= __lookup_replace(ns
, ent
->new->base
.hname
,
923 !(mask
& AA_MAY_REPLACE_POLICY
),
928 if (ent
->new->rename
) {
929 error
= __lookup_replace(ns
, ent
->new->rename
,
930 !(mask
& AA_MAY_REPLACE_POLICY
),
931 &ent
->rename
, &info
);
936 /* released when @new is freed */
937 ent
->new->ns
= aa_get_ns(ns
);
939 if (ent
->old
|| ent
->rename
)
942 /* no ref on policy only use inside lock */
943 policy
= __lookup_parent(ns
, ent
->new->base
.hname
);
945 struct aa_profile
*p
;
946 p
= __list_lookup_parent(&lh
, ent
->new);
949 info
= "parent does not exist";
952 rcu_assign_pointer(ent
->new->parent
, aa_get_profile(p
));
953 } else if (policy
!= &ns
->base
) {
954 /* released on profile replacement or free_profile */
955 struct aa_profile
*p
= (struct aa_profile
*) policy
;
956 rcu_assign_pointer(ent
->new->parent
, aa_get_profile(p
));
960 /* create new fs entries for introspection if needed */
961 list_for_each_entry(ent
, &lh
, list
) {
963 struct dentry
*parent
;
964 if (rcu_access_pointer(ent
->new->parent
)) {
965 struct aa_profile
*p
;
966 p
= aa_deref_parent(ent
->new);
967 parent
= prof_child_dir(p
);
969 parent
= ns_subprofs_dir(ent
->new->ns
);
970 error
= __aa_fs_profile_mkdir(ent
->new, parent
);
974 info
= "failed to create";
979 /* Done with checks that may fail - do actual replacement */
980 list_for_each_entry_safe(ent
, tmp
, &lh
, list
) {
981 list_del_init(&ent
->list
);
982 op
= (!ent
->old
&& !ent
->rename
) ? OP_PROF_LOAD
: OP_PROF_REPL
;
984 audit_policy(label
, op
, ns_name
, ent
->new->base
.hname
, NULL
, error
);
987 share_name(ent
->old
, ent
->new);
988 __replace_profile(ent
->old
, ent
->new);
990 __replace_profile(ent
->rename
, ent
->new);
991 } else if (ent
->rename
) {
992 /* TODO: case not actually supported yet */
995 struct list_head
*lh
;
996 if (rcu_access_pointer(ent
->new->parent
)) {
997 struct aa_profile
*parent
;
998 parent
= update_to_newest_parent(ent
->new);
999 lh
= &parent
->base
.profiles
;
1001 lh
= &ns
->base
.profiles
;
1002 __add_profile(lh
, ent
->new);
1004 aa_load_ent_free(ent
);
1006 __aa_labelset_update_subtree(ns
);
1007 __aa_bump_ns_revision(ns
);
1008 mutex_unlock(&ns
->lock
);
1018 mutex_unlock(&ns
->lock
);
1020 /* audit cause of failure */
1021 op
= (!ent
->old
) ? OP_PROF_LOAD
: OP_PROF_REPL
;
1023 audit_policy(label
, op
, ns_name
, ent
->new->base
.hname
, info
, error
);
1024 /* audit status that rest of profiles in the atomic set failed too */
1025 info
= "valid profile in failed atomic policy load";
1026 list_for_each_entry(tmp
, &lh
, list
) {
1028 info
= "unchecked profile in failed atomic policy load";
1029 /* skip entry that caused failure */
1032 op
= (!ent
->old
) ? OP_PROF_LOAD
: OP_PROF_REPL
;
1033 audit_policy(label
, op
, ns_name
, tmp
->new->base
.hname
, info
, error
);
1035 list_for_each_entry_safe(ent
, tmp
, &lh
, list
) {
1036 list_del_init(&ent
->list
);
1037 aa_load_ent_free(ent
);
1044 * aa_remove_profiles - remove profile(s) from the system
1045 * @view: namespace the remove is being done from
1046 * @label: label attempting to remove policy
1047 * @fqname: name of the profile or namespace to remove (NOT NULL)
1048 * @size: size of the name
1050 * Remove a profile or sub namespace from the current namespace, so that
1051 * they can not be found anymore and mark them as replaced by unconfined
1053 * NOTE: removing confinement does not restore rlimits to preconfinemnet values
1055 * Returns: size of data consume else error code if fails
1057 ssize_t
aa_remove_profiles(struct aa_ns
*view
, struct aa_label
*label
,
1058 char *fqname
, size_t size
)
1060 struct aa_ns
*root
= NULL
, *ns
= NULL
;
1061 struct aa_profile
*profile
= NULL
;
1062 const char *name
= fqname
, *info
= NULL
;
1063 char *ns_name
= NULL
;
1067 info
= "no profile specified";
1074 if (fqname
[0] == ':') {
1075 name
= aa_split_fqname(fqname
, &ns_name
);
1076 /* released below */
1077 ns
= aa_find_ns(root
, ns_name
);
1079 info
= "namespace does not exist";
1084 /* released below */
1085 ns
= aa_get_ns(root
);
1088 /* remove namespace - can only happen if fqname[0] == ':' */
1089 mutex_lock(&ns
->parent
->lock
);
1091 __aa_bump_ns_revision(ns
);
1092 mutex_unlock(&ns
->parent
->lock
);
1094 /* remove profile */
1095 mutex_lock(&ns
->lock
);
1096 profile
= aa_get_profile(__lookup_profile(&ns
->base
, name
));
1099 info
= "profile does not exist";
1102 name
= profile
->base
.hname
;
1103 __remove_profile(profile
);
1104 __aa_labelset_update_subtree(ns
);
1105 __aa_bump_ns_revision(ns
);
1106 mutex_unlock(&ns
->lock
);
1109 /* don't fail removal if audit fails */
1110 (void) audit_policy(label
, OP_PROF_RM
, ns_name
, name
, info
, error
);
1112 aa_put_profile(profile
);
1116 mutex_unlock(&ns
->lock
);
1120 (void) audit_policy(label
, OP_PROF_RM
, ns_name
, name
, info
, error
);