2 * AppArmor security module
4 * This file contains AppArmor policy definitions.
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
18 #include <linux/capability.h>
19 #include <linux/cred.h>
20 #include <linux/kref.h>
21 #include <linux/sched.h>
22 #include <linux/slab.h>
23 #include <linux/socket.h>
27 #include "capability.h"
32 extern const char *const aa_profile_mode_names
[];
33 #define APPARMOR_MODE_NAMES_MAX_INDEX 4
35 #define PROFILE_MODE(_profile, _mode) \
36 ((aa_g_profile_mode == (_mode)) || \
37 ((_profile)->mode == (_mode)))
39 #define COMPLAIN_MODE(_profile) PROFILE_MODE((_profile), APPARMOR_COMPLAIN)
41 #define KILL_MODE(_profile) PROFILE_MODE((_profile), APPARMOR_KILL)
43 #define PROFILE_IS_HAT(_profile) ((_profile)->flags & PFLAG_HAT)
45 #define PROFILE_INVALID(_profile) ((_profile)->flags & PFLAG_INVALID)
47 #define on_list_rcu(X) (!list_empty(X) && (X)->prev != LIST_POISON2)
50 * FIXME: currently need a clean way to replace and remove profiles as a
51 * set. It should be done at the namespace level.
52 * Either, with a set of profiles loaded at the namespace level or via
53 * a mark and remove marked interface.
56 APPARMOR_ENFORCE
, /* enforce access rules */
57 APPARMOR_COMPLAIN
, /* allow and log access violations */
58 APPARMOR_KILL
, /* kill task on access violation */
59 APPARMOR_UNCONFINED
, /* profile set to unconfined */
63 PFLAG_HAT
= 1, /* profile is a hat */
64 PFLAG_NULL
= 4, /* profile is null learning profile */
65 PFLAG_IX_ON_NAME_ERROR
= 8, /* fallback to ix on name lookup fail */
66 PFLAG_IMMUTABLE
= 0x10, /* don't allow changes/replacement */
67 PFLAG_USER_DEFINED
= 0x20, /* user based profile - lower privs */
68 PFLAG_NO_LIST_REF
= 0x40, /* list doesn't keep profile ref */
69 PFLAG_OLD_NULL_TRANS
= 0x100, /* use // as the null transition */
70 PFLAG_INVALID
= 0x200, /* profile replaced/removed */
71 PFLAG_NS_COUNT
= 0x400, /* carries NS ref count */
73 /* These flags must correspond with PATH_flags */
74 PFLAG_MEDIATE_DELETED
= 0x10000, /* mediate instead delegate deleted */
79 /* struct aa_policy - common part of both namespaces and profiles
80 * @name: name of the object
81 * @hname - The hierarchical name
82 * @list: list policy object is on
83 * @profiles: head of the profiles list contained in the object
88 struct list_head list
;
89 struct list_head profiles
;
92 /* struct aa_ns_acct - accounting of profiles in namespace
93 * @max_size: maximum space allowed for all profiles in namespace
94 * @max_count: maximum number of profiles that can be in this namespace
95 * @size: current size of profiles
96 * @count: current count of profiles (includes null profiles)
105 /* struct aa_namespace - namespace for a set of profiles
106 * @base: common policy
107 * @parent: parent of namespace
108 * @lock: lock for modifying the object
109 * @acct: accounting for the namespace
110 * @unconfined: special unconfined profile for the namespace
111 * @sub_ns: list of namespaces under the current namespace.
112 * @uniq_null: uniq value used for null learning profiles
113 * @uniq_id: a unique id count for the profiles in the namespace
114 * @dents: dentries for the namespaces file entries in apparmorfs
116 * An aa_namespace defines the set profiles that are searched to determine
117 * which profile to attach to a task. Profiles can not be shared between
118 * aa_namespaces and profile names within a namespace are guaranteed to be
119 * unique. When profiles in separate namespaces have the same name they
120 * are NOT considered to be equivalent.
122 * Namespaces are hierarchical and only namespaces and profiles below the
123 * current namespace are visible.
125 * Namespace names must be unique and can not contain the characters :/\0
127 * FIXME TODO: add vserver support of namespaces (can it all be done in
130 struct aa_namespace
{
131 struct aa_policy base
;
132 struct aa_namespace
*parent
;
134 struct aa_ns_acct acct
;
135 struct aa_profile
*unconfined
;
136 struct list_head sub_ns
;
140 struct dentry
*dents
[AAFS_NS_SIZEOF
];
143 /* struct aa_policydb - match engine for a policy
144 * dfa: dfa pattern match
145 * start: set of start states for the different classes of data
148 /* Generic policy DFA specific rule types will be subsections of it */
150 unsigned int start
[AA_CLASS_LAST
+ 1];
154 struct aa_replacedby
{
156 struct aa_profile __rcu
*profile
;
160 /* struct aa_profile - basic confinement data
161 * @base - base components of the profile (name, refcount, lists, lock ...)
162 * @count: reference count of the obj
163 * @rcu: rcu head used when removing from @list
164 * @parent: parent of profile
165 * @ns: namespace the profile is in
166 * @replacedby: is set to the profile that replaced this profile
167 * @rename: optional profile name that this profile renamed
168 * @attach: human readable attachment string
169 * @xmatch: optional extended matching for unconfined executables names
170 * @xmatch_len: xmatch prefix len, used to determine xmatch priority
171 * @audit: the auditing mode of the profile
172 * @mode: the enforcement mode of the profile
173 * @flags: flags controlling profile behavior
174 * @path_flags: flags controlling path generation behavior
175 * @size: the memory consumed by this profiles rules
176 * @policy: general match rules governing policy
177 * @file: The set of rules governing basic file access and domain transitions
178 * @caps: capabilities for the profile
179 * @rlimits: rlimits for the profile
181 * @dents: dentries for the profiles file entries in apparmorfs
182 * @dirname: name of the profile dir in apparmorfs
184 * The AppArmor profile contains the basic confinement data. Each profile
185 * has a name, and exists in a namespace. The @name and @exec_match are
186 * used to determine profile attachment against unconfined tasks. All other
187 * attachments are determined by profile X transition rules.
189 * The @replacedby struct is write protected by the profile lock.
191 * Profiles have a hierarchy where hats and children profiles keep
192 * a reference to their parent.
194 * Profile names can not begin with a : and can not contain the \0
195 * character. If a profile name begins with / it will be considered when
196 * determining profile attachment on "unconfined" tasks.
199 struct aa_policy base
;
202 struct aa_profile __rcu
*parent
;
204 struct aa_namespace
*ns
;
205 struct aa_replacedby
*replacedby
;
209 struct aa_dfa
*xmatch
;
211 enum audit_mode audit
;
217 struct aa_policydb policy
;
218 struct aa_file_rules file
;
220 struct aa_rlimit rlimits
;
223 struct dentry
*dents
[AAFS_PROF_SIZEOF
];
226 extern struct aa_namespace
*root_ns
;
227 extern enum profile_mode aa_g_profile_mode
;
229 void aa_add_profile(struct aa_policy
*common
, struct aa_profile
*profile
);
231 bool aa_ns_visible(struct aa_namespace
*curr
, struct aa_namespace
*view
);
232 const char *aa_ns_name(struct aa_namespace
*parent
, struct aa_namespace
*child
);
233 int aa_alloc_root_ns(void);
234 void aa_free_root_ns(void);
235 void aa_free_namespace_kref(struct kref
*kref
);
237 struct aa_namespace
*aa_find_namespace(struct aa_namespace
*root
,
241 void aa_free_replacedby_kref(struct kref
*kref
);
242 struct aa_profile
*aa_alloc_profile(const char *name
);
243 struct aa_profile
*aa_new_null_profile(struct aa_profile
*parent
, int hat
);
244 void aa_free_profile(struct aa_profile
*profile
);
245 void aa_free_profile_kref(struct kref
*kref
);
246 struct aa_profile
*aa_find_child(struct aa_profile
*parent
, const char *name
);
247 struct aa_profile
*aa_lookup_profile(struct aa_namespace
*ns
, const char *name
);
248 struct aa_profile
*aa_match_profile(struct aa_namespace
*ns
, const char *name
);
250 ssize_t
aa_replace_profiles(void *udata
, size_t size
, bool noreplace
);
251 ssize_t
aa_remove_profiles(char *name
, size_t size
);
254 #define PROF_REPLACE 0
256 #define unconfined(X) ((X)->mode == APPARMOR_UNCONFINED)
259 static inline struct aa_profile
*aa_deref_parent(struct aa_profile
*p
)
261 return rcu_dereference_protected(p
->parent
,
262 mutex_is_locked(&p
->ns
->lock
));
266 * aa_get_profile - increment refcount on profile @p
267 * @p: profile (MAYBE NULL)
269 * Returns: pointer to @p if @p is NULL will return NULL
270 * Requires: @p must be held with valid refcount when called
272 static inline struct aa_profile
*aa_get_profile(struct aa_profile
*p
)
275 kref_get(&(p
->count
));
281 * aa_get_profile_not0 - increment refcount on profile @p found via lookup
282 * @p: profile (MAYBE NULL)
284 * Returns: pointer to @p if @p is NULL will return NULL
285 * Requires: @p must be held with valid refcount when called
287 static inline struct aa_profile
*aa_get_profile_not0(struct aa_profile
*p
)
289 if (p
&& kref_get_not0(&p
->count
))
296 * aa_get_profile_rcu - increment a refcount profile that can be replaced
297 * @p: pointer to profile that can be replaced (NOT NULL)
299 * Returns: pointer to a refcounted profile.
300 * else NULL if no profile
302 static inline struct aa_profile
*aa_get_profile_rcu(struct aa_profile __rcu
**p
)
304 struct aa_profile
*c
;
308 c
= rcu_dereference(*p
);
309 } while (c
&& !kref_get_not0(&c
->count
));
316 * aa_get_newest_profile - find the newest version of @profile
317 * @profile: the profile to check for newer versions of
319 * Returns: refcounted newest version of @profile taking into account
320 * replacement, renames and removals
323 static inline struct aa_profile
*aa_get_newest_profile(struct aa_profile
*p
)
328 if (PROFILE_INVALID(p
))
329 return aa_get_profile_rcu(&p
->replacedby
->profile
);
331 return aa_get_profile(p
);
335 * aa_put_profile - decrement refcount on profile @p
336 * @p: profile (MAYBE NULL)
338 static inline void aa_put_profile(struct aa_profile
*p
)
341 kref_put(&p
->count
, aa_free_profile_kref
);
344 static inline struct aa_replacedby
*aa_get_replacedby(struct aa_replacedby
*p
)
347 kref_get(&(p
->count
));
352 static inline void aa_put_replacedby(struct aa_replacedby
*p
)
355 kref_put(&p
->count
, aa_free_replacedby_kref
);
358 /* requires profile list write lock held */
359 static inline void __aa_update_replacedby(struct aa_profile
*orig
,
360 struct aa_profile
*new)
362 struct aa_profile
*tmp
= rcu_dereference(orig
->replacedby
->profile
);
363 rcu_assign_pointer(orig
->replacedby
->profile
, aa_get_profile(new));
364 orig
->flags
|= PFLAG_INVALID
;
369 * aa_get_namespace - increment references count on @ns
370 * @ns: namespace to increment reference count of (MAYBE NULL)
372 * Returns: pointer to @ns, if @ns is NULL returns NULL
373 * Requires: @ns must be held with valid refcount when called
375 static inline struct aa_namespace
*aa_get_namespace(struct aa_namespace
*ns
)
378 aa_get_profile(ns
->unconfined
);
384 * aa_put_namespace - decrement refcount on @ns
385 * @ns: namespace to put reference of
387 * Decrement reference count of @ns and if no longer in use free it
389 static inline void aa_put_namespace(struct aa_namespace
*ns
)
392 aa_put_profile(ns
->unconfined
);
395 static inline int AUDIT_MODE(struct aa_profile
*profile
)
397 if (aa_g_audit
!= AUDIT_NORMAL
)
400 return profile
->audit
;
403 bool aa_may_manage_policy(int op
);
405 #endif /* __AA_POLICY_H */