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/rhashtable.h>
22 #include <linux/sched.h>
23 #include <linux/slab.h>
24 #include <linux/socket.h>
28 #include "capability.h"
40 extern int unprivileged_userns_apparmor_policy;
42 extern const char *const aa_profile_mode_names[];
43 #define APPARMOR_MODE_NAMES_MAX_INDEX 4
45 #define PROFILE_MODE(_profile, _mode) \
46 ((aa_g_profile_mode == (_mode)) || \
47 ((_profile)->mode == (_mode)))
49 #define COMPLAIN_MODE(_profile) PROFILE_MODE((_profile), APPARMOR_COMPLAIN)
51 #define KILL_MODE(_profile) PROFILE_MODE((_profile), APPARMOR_KILL)
53 #define PROFILE_IS_HAT(_profile) ((_profile)->label.flags & FLAG_HAT)
55 #define profile_is_stale(_profile) (label_is_stale(&(_profile)->label))
57 #define on_list_rcu(X) (!list_empty(X) && (X)->prev != LIST_POISON2)
60 * FIXME: currently need a clean way to replace and remove profiles as a
61 * set. It should be done at the namespace level.
62 * Either, with a set of profiles loaded at the namespace level or via
63 * a mark and remove marked interface.
66 APPARMOR_ENFORCE, /* enforce access rules */
67 APPARMOR_COMPLAIN, /* allow and log access violations */
68 APPARMOR_KILL, /* kill task on access violation */
69 APPARMOR_UNCONFINED, /* profile set to unconfined */
73 /* struct aa_policydb - match engine for a policy
74 * dfa: dfa pattern match
75 * start: set of start states for the different classes of data
78 /* Generic policy DFA specific rule types will be subsections of it */
80 unsigned int start[AA_CLASS_LAST + 1];
84 /* struct aa_data - generic data structure
85 * key: name for retrieving this data
86 * size: size of data in bytes
88 * head: reserved for rhashtable
94 struct rhash_head head;
98 /* struct aa_profile - basic confinement data
99 * @base - base components of the profile (name, refcount, lists, lock ...)
100 * @label - label this profile is an extension of
101 * @parent: parent of profile
102 * @ns: namespace the profile is in
103 * @rename: optional profile name that this profile renamed
104 * @attach: human readable attachment string
105 * @xmatch: optional extended matching for unconfined executables names
106 * @xmatch_len: xmatch prefix len, used to determine xmatch priority
107 * @audit: the auditing mode of the profile
108 * @mode: the enforcement mode of the profile
109 * @path_flags: flags controlling path generation behavior
110 * @disconnected: what to prepend if attach_disconnected is specified
111 * @size: the memory consumed by this profiles rules
112 * @policy: general match rules governing policy
113 * @file: The set of rules governing basic file access and domain transitions
114 * @caps: capabilities for the profile
115 * @net: network controls for the profile
116 * @rlimits: rlimits for the profile
118 * @dents: dentries for the profiles file entries in apparmorfs
119 * @dirname: name of the profile dir in apparmorfs
120 * @data: hashtable for free-form policy aa_data
122 * The AppArmor profile contains the basic confinement data. Each profile
123 * has a name, and exists in a namespace. The @name and @exec_match are
124 * used to determine profile attachment against unconfined tasks. All other
125 * attachments are determined by profile X transition rules.
127 * Profiles have a hierarchy where hats and children profiles keep
128 * a reference to their parent.
130 * Profile names can not begin with a : and can not contain the \0
131 * character. If a profile name begins with / it will be considered when
132 * determining profile attachment on "unconfined" tasks.
135 struct aa_policy base;
136 struct aa_profile __rcu *parent;
142 struct aa_dfa *xmatch;
144 enum audit_mode audit;
147 const char *disconnected;
150 struct aa_policydb policy;
151 struct aa_file_rules file;
154 struct aa_rlimit rlimits;
156 struct aa_loaddata *rawdata;
159 struct dentry *dents[AAFS_PROF_SIZEOF];
160 struct rhashtable *data;
161 struct aa_label label;
164 extern enum profile_mode aa_g_profile_mode;
166 #define AA_MAY_LOAD_POLICY AA_MAY_APPEND
167 #define AA_MAY_REPLACE_POLICY AA_MAY_WRITE
168 #define AA_MAY_REMOVE_POLICY AA_MAY_DELETE
170 #define profiles_ns(P) ((P)->ns)
171 #define name_is_shared(A, B) ((A)->hname && (A)->hname == (B)->hname)
173 void aa_add_profile(struct aa_policy *common, struct aa_profile *profile);
176 void aa_free_proxy_kref(struct kref *kref);
177 struct aa_profile *aa_alloc_profile(const char *name, struct aa_proxy *proxy,
179 struct aa_profile *aa_new_null_profile(struct aa_profile *parent, bool hat,
180 const char *base, gfp_t gfp);
181 void aa_free_profile(struct aa_profile *profile);
182 void aa_free_profile_kref(struct kref *kref);
183 struct aa_profile *aa_find_child(struct aa_profile *parent, const char *name);
184 struct aa_profile *aa_lookupn_profile(struct aa_ns *ns, const char *hname,
186 struct aa_profile *aa_lookup_profile(struct aa_ns *ns, const char *name);
187 struct aa_profile *aa_fqlookupn_profile(struct aa_label *base,
188 const char *fqname, size_t n);
189 struct aa_profile *aa_match_profile(struct aa_ns *ns, const char *name);
191 ssize_t aa_replace_profiles(struct aa_ns *view, struct aa_label *label,
192 u32 mask, struct aa_loaddata *udata);
193 ssize_t aa_remove_profiles(struct aa_ns *view, struct aa_label *label,
194 char *name, size_t size);
195 void __aa_profile_list_release(struct list_head *head);
198 #define PROF_REPLACE 0
200 #define profile_unconfined(X) ((X)->mode == APPARMOR_UNCONFINED)
203 * aa_get_newest_profile - simple wrapper fn to wrap the label version
204 * @p: profile (NOT NULL)
206 * Returns refcount to newest version of the profile (maybe @p)
208 * Requires: @p must be held with a valid refcount
210 static inline struct aa_profile *aa_get_newest_profile(struct aa_profile *p)
212 return labels_profile(aa_get_newest_label(&p->label));
215 #define PROFILE_MEDIATES(P, T) ((P)->policy.start[(T)])
216 /* safe version of POLICY_MEDIATES for full range input */
217 static inline unsigned int PROFILE_MEDIATES_SAFE(struct aa_profile *profile,
220 if (profile->policy.dfa)
221 return aa_dfa_match_len(profile->policy.dfa,
222 profile->policy.start[0], &class, 1);
226 static inline unsigned int PROFILE_MEDIATES_AF(struct aa_profile *profile,
228 unsigned int state = PROFILE_MEDIATES(profile, AA_CLASS_NET);
229 u16 be_af = cpu_to_be16(AF);
233 return aa_dfa_match_len(profile->policy.dfa, state, (char *) &be_af, 2);
237 * aa_get_profile - increment refcount on profile @p
238 * @p: profile (MAYBE NULL)
240 * Returns: pointer to @p if @p is NULL will return NULL
241 * Requires: @p must be held with valid refcount when called
243 static inline struct aa_profile *aa_get_profile(struct aa_profile *p)
246 kref_get(&(p->label.count));
252 * aa_get_profile_not0 - increment refcount on profile @p found via lookup
253 * @p: profile (MAYBE NULL)
255 * Returns: pointer to @p if @p is NULL will return NULL
256 * Requires: @p must be held with valid refcount when called
258 static inline struct aa_profile *aa_get_profile_not0(struct aa_profile *p)
260 if (p && kref_get_unless_zero(&p->label.count))
267 * aa_get_profile_rcu - increment a refcount profile that can be replaced
268 * @p: pointer to profile that can be replaced (NOT NULL)
270 * Returns: pointer to a refcounted profile.
271 * else NULL if no profile
273 static inline struct aa_profile *aa_get_profile_rcu(struct aa_profile __rcu **p)
275 struct aa_profile *c;
279 c = rcu_dereference(*p);
280 } while (c && !kref_get_unless_zero(&c->label.count));
287 * aa_put_profile - decrement refcount on profile @p
288 * @p: profile (MAYBE NULL)
290 static inline void aa_put_profile(struct aa_profile *p)
293 kref_put(&p->label.count, aa_label_kref);
296 static inline int AUDIT_MODE(struct aa_profile *profile)
298 if (aa_g_audit != AUDIT_NORMAL)
301 return profile->audit;
304 bool policy_view_capable(struct aa_ns *ns);
305 bool policy_admin_capable(struct aa_ns *ns);
306 int aa_may_manage_policy(struct aa_label *label, struct aa_ns *ns,
309 #endif /* __AA_POLICY_H */