1 /* SPDX-License-Identifier: GPL-2.0-only */
3 * AppArmor security module
5 * This file contains AppArmor policy definitions.
7 * Copyright (C) 1998-2008 Novell/SUSE
8 * Copyright 2009-2010 Canonical Ltd.
14 #include <linux/capability.h>
15 #include <linux/cred.h>
16 #include <linux/kref.h>
17 #include <linux/rhashtable.h>
18 #include <linux/sched.h>
19 #include <linux/slab.h>
20 #include <linux/socket.h>
24 #include "capability.h"
36 extern int unprivileged_userns_apparmor_policy;
38 extern const char *const aa_profile_mode_names[];
39 #define APPARMOR_MODE_NAMES_MAX_INDEX 4
41 #define PROFILE_MODE(_profile, _mode) \
42 ((aa_g_profile_mode == (_mode)) || \
43 ((_profile)->mode == (_mode)))
45 #define COMPLAIN_MODE(_profile) PROFILE_MODE((_profile), APPARMOR_COMPLAIN)
47 #define USER_MODE(_profile) PROFILE_MODE((_profile), APPARMOR_USER)
49 #define KILL_MODE(_profile) PROFILE_MODE((_profile), APPARMOR_KILL)
51 #define PROFILE_IS_HAT(_profile) ((_profile)->label.flags & FLAG_HAT)
53 #define CHECK_DEBUG1(_profile) ((_profile)->label.flags & FLAG_DEBUG1)
55 #define CHECK_DEBUG2(_profile) ((_profile)->label.flags & FLAG_DEBUG2)
57 #define profile_is_stale(_profile) (label_is_stale(&(_profile)->label))
59 #define on_list_rcu(X) (!list_empty(X) && (X)->prev != LIST_POISON2)
62 * FIXME: currently need a clean way to replace and remove profiles as a
63 * set. It should be done at the namespace level.
64 * Either, with a set of profiles loaded at the namespace level or via
65 * a mark and remove marked interface.
68 APPARMOR_ENFORCE, /* enforce access rules */
69 APPARMOR_COMPLAIN, /* allow and log access violations */
70 APPARMOR_KILL, /* kill task on access violation */
71 APPARMOR_UNCONFINED, /* profile set to unconfined */
72 APPARMOR_USER, /* modified complain mode to userspace */
76 /* struct aa_policydb - match engine for a policy
77 * dfa: dfa pattern match
78 * perms: table of permissions
79 * strs: table of strings, index by x
80 * start: set of start states for the different classes of data
84 struct aa_perms *perms;
85 struct aa_str_table trans;
86 aa_state_t start[AA_CLASS_LAST + 1];
89 static inline void aa_destroy_policydb(struct aa_policydb *policy)
91 aa_put_dfa(policy->dfa);
93 kvfree(policy->perms);
94 aa_free_str_table(&policy->trans);
98 static inline struct aa_perms *aa_lookup_perms(struct aa_policydb *policy,
101 unsigned int index = ACCEPT_TABLE(policy->dfa)[state];
103 if (!(policy->perms))
104 return &default_perms;
106 return &(policy->perms[index]);
110 /* struct aa_data - generic data structure
111 * key: name for retrieving this data
112 * size: size of data in bytes
114 * head: reserved for rhashtable
120 struct rhash_head head;
124 /* struct aa_profile - basic confinement data
125 * @base - base components of the profile (name, refcount, lists, lock ...)
126 * @label - label this profile is an extension of
127 * @parent: parent of profile
128 * @ns: namespace the profile is in
129 * @rename: optional profile name that this profile renamed
130 * @attach: human readable attachment string
131 * @xmatch: optional extended matching for unconfined executables names
132 * @xmatch_len: xmatch prefix len, used to determine xmatch priority
133 * @audit: the auditing mode of the profile
134 * @mode: the enforcement mode of the profile
135 * @path_flags: flags controlling path generation behavior
136 * @disconnected: what to prepend if attach_disconnected is specified
137 * @size: the memory consumed by this profiles rules
138 * @policy: general match rules governing policy
139 * @file: The set of rules governing basic file access and domain transitions
140 * @caps: capabilities for the profile
141 * @rlimits: rlimits for the profile
143 * @dents: dentries for the profiles file entries in apparmorfs
144 * @dirname: name of the profile dir in apparmorfs
145 * @data: hashtable for free-form policy aa_data
147 * The AppArmor profile contains the basic confinement data. Each profile
148 * has a name, and exists in a namespace. The @name and @exec_match are
149 * used to determine profile attachment against unconfined tasks. All other
150 * attachments are determined by profile X transition rules.
152 * Profiles have a hierarchy where hats and children profiles keep
153 * a reference to their parent.
155 * Profile names can not begin with a : and can not contain the \0
156 * character. If a profile name begins with / it will be considered when
157 * determining profile attachment on "unconfined" tasks.
160 struct aa_policy base;
161 struct aa_profile __rcu *parent;
167 struct aa_policydb xmatch;
168 unsigned int xmatch_len;
170 enum audit_mode audit;
173 const char *disconnected;
176 struct aa_policydb policy;
177 struct aa_policydb file;
183 struct aa_rlimit rlimits;
186 struct aa_secmark *secmark;
188 struct aa_loaddata *rawdata;
191 struct dentry *dents[AAFS_PROF_SIZEOF];
192 struct rhashtable *data;
193 struct aa_label label;
196 extern enum profile_mode aa_g_profile_mode;
198 #define AA_MAY_LOAD_POLICY AA_MAY_APPEND
199 #define AA_MAY_REPLACE_POLICY AA_MAY_WRITE
200 #define AA_MAY_REMOVE_POLICY AA_MAY_DELETE
202 #define profiles_ns(P) ((P)->ns)
203 #define name_is_shared(A, B) ((A)->hname && (A)->hname == (B)->hname)
205 void aa_add_profile(struct aa_policy *common, struct aa_profile *profile);
208 void aa_free_proxy_kref(struct kref *kref);
209 struct aa_profile *aa_alloc_profile(const char *name, struct aa_proxy *proxy,
211 struct aa_profile *aa_new_null_profile(struct aa_profile *parent, bool hat,
212 const char *base, gfp_t gfp);
213 void aa_free_profile(struct aa_profile *profile);
214 void aa_free_profile_kref(struct kref *kref);
215 struct aa_profile *aa_find_child(struct aa_profile *parent, const char *name);
216 struct aa_profile *aa_lookupn_profile(struct aa_ns *ns, const char *hname,
218 struct aa_profile *aa_lookup_profile(struct aa_ns *ns, const char *name);
219 struct aa_profile *aa_fqlookupn_profile(struct aa_label *base,
220 const char *fqname, size_t n);
221 struct aa_profile *aa_match_profile(struct aa_ns *ns, const char *name);
223 ssize_t aa_replace_profiles(struct aa_ns *view, struct aa_label *label,
224 u32 mask, struct aa_loaddata *udata);
225 ssize_t aa_remove_profiles(struct aa_ns *view, struct aa_label *label,
226 char *name, size_t size);
227 void __aa_profile_list_release(struct list_head *head);
230 #define PROF_REPLACE 0
232 #define profile_unconfined(X) ((X)->mode == APPARMOR_UNCONFINED)
235 * aa_get_newest_profile - simple wrapper fn to wrap the label version
236 * @p: profile (NOT NULL)
238 * Returns refcount to newest version of the profile (maybe @p)
240 * Requires: @p must be held with a valid refcount
242 static inline struct aa_profile *aa_get_newest_profile(struct aa_profile *p)
244 return labels_profile(aa_get_newest_label(&p->label));
247 static inline aa_state_t PROFILE_MEDIATES(struct aa_profile *profile,
250 if (class <= AA_CLASS_LAST)
251 return profile->policy.start[class];
253 return aa_dfa_match_len(profile->policy.dfa,
254 profile->policy.start[0], &class, 1);
257 static inline aa_state_t PROFILE_MEDIATES_AF(struct aa_profile *profile,
259 aa_state_t state = PROFILE_MEDIATES(profile, AA_CLASS_NET);
260 __be16 be_af = cpu_to_be16(AF);
264 return aa_dfa_match_len(profile->policy.dfa, state, (char *) &be_af, 2);
268 * aa_get_profile - increment refcount on profile @p
269 * @p: profile (MAYBE NULL)
271 * Returns: pointer to @p if @p is NULL will return NULL
272 * Requires: @p must be held with valid refcount when called
274 static inline struct aa_profile *aa_get_profile(struct aa_profile *p)
277 kref_get(&(p->label.count));
283 * aa_get_profile_not0 - increment refcount on profile @p found via lookup
284 * @p: profile (MAYBE NULL)
286 * Returns: pointer to @p if @p is NULL will return NULL
287 * Requires: @p must be held with valid refcount when called
289 static inline struct aa_profile *aa_get_profile_not0(struct aa_profile *p)
291 if (p && kref_get_unless_zero(&p->label.count))
298 * aa_get_profile_rcu - increment a refcount profile that can be replaced
299 * @p: pointer to profile that can be replaced (NOT NULL)
301 * Returns: pointer to a refcounted profile.
302 * else NULL if no profile
304 static inline struct aa_profile *aa_get_profile_rcu(struct aa_profile __rcu **p)
306 struct aa_profile *c;
310 c = rcu_dereference(*p);
311 } while (c && !kref_get_unless_zero(&c->label.count));
318 * aa_put_profile - decrement refcount on profile @p
319 * @p: profile (MAYBE NULL)
321 static inline void aa_put_profile(struct aa_profile *p)
324 kref_put(&p->label.count, aa_label_kref);
327 static inline int AUDIT_MODE(struct aa_profile *profile)
329 if (aa_g_audit != AUDIT_NORMAL)
332 return profile->audit;
335 bool aa_policy_view_capable(struct aa_label *label, struct aa_ns *ns);
336 bool aa_policy_admin_capable(struct aa_label *label, struct aa_ns *ns);
337 int aa_may_manage_policy(struct aa_label *label, struct aa_ns *ns,
339 bool aa_current_policy_view_capable(struct aa_ns *ns);
340 bool aa_current_policy_admin_capable(struct aa_ns *ns);
342 #endif /* __AA_POLICY_H */