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Diffstat (limited to 'security/apparmor/include/policy.h')
-rw-r--r-- | security/apparmor/include/policy.h | 305 |
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diff --git a/security/apparmor/include/policy.h b/security/apparmor/include/policy.h new file mode 100644 index 000000000000..aeda5cf56904 --- /dev/null +++ b/security/apparmor/include/policy.h | |||
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1 | /* | ||
2 | * AppArmor security module | ||
3 | * | ||
4 | * This file contains AppArmor policy definitions. | ||
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 | #ifndef __AA_POLICY_H | ||
16 | #define __AA_POLICY_H | ||
17 | |||
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> | ||
24 | |||
25 | #include "apparmor.h" | ||
26 | #include "audit.h" | ||
27 | #include "capability.h" | ||
28 | #include "domain.h" | ||
29 | #include "file.h" | ||
30 | #include "resource.h" | ||
31 | |||
32 | extern const char *profile_mode_names[]; | ||
33 | #define APPARMOR_NAMES_MAX_INDEX 3 | ||
34 | |||
35 | #define COMPLAIN_MODE(_profile) \ | ||
36 | ((aa_g_profile_mode == APPARMOR_COMPLAIN) || \ | ||
37 | ((_profile)->mode == APPARMOR_COMPLAIN)) | ||
38 | |||
39 | #define KILL_MODE(_profile) \ | ||
40 | ((aa_g_profile_mode == APPARMOR_KILL) || \ | ||
41 | ((_profile)->mode == APPARMOR_KILL)) | ||
42 | |||
43 | #define PROFILE_IS_HAT(_profile) ((_profile)->flags & PFLAG_HAT) | ||
44 | |||
45 | /* | ||
46 | * FIXME: currently need a clean way to replace and remove profiles as a | ||
47 | * set. It should be done at the namespace level. | ||
48 | * Either, with a set of profiles loaded at the namespace level or via | ||
49 | * a mark and remove marked interface. | ||
50 | */ | ||
51 | enum profile_mode { | ||
52 | APPARMOR_ENFORCE, /* enforce access rules */ | ||
53 | APPARMOR_COMPLAIN, /* allow and log access violations */ | ||
54 | APPARMOR_KILL, /* kill task on access violation */ | ||
55 | }; | ||
56 | |||
57 | enum profile_flags { | ||
58 | PFLAG_HAT = 1, /* profile is a hat */ | ||
59 | PFLAG_UNCONFINED = 2, /* profile is an unconfined profile */ | ||
60 | PFLAG_NULL = 4, /* profile is null learning profile */ | ||
61 | PFLAG_IX_ON_NAME_ERROR = 8, /* fallback to ix on name lookup fail */ | ||
62 | PFLAG_IMMUTABLE = 0x10, /* don't allow changes/replacement */ | ||
63 | PFLAG_USER_DEFINED = 0x20, /* user based profile - lower privs */ | ||
64 | PFLAG_NO_LIST_REF = 0x40, /* list doesn't keep profile ref */ | ||
65 | PFLAG_OLD_NULL_TRANS = 0x100, /* use // as the null transition */ | ||
66 | |||
67 | /* These flags must correspond with PATH_flags */ | ||
68 | PFLAG_MEDIATE_DELETED = 0x10000, /* mediate instead delegate deleted */ | ||
69 | }; | ||
70 | |||
71 | struct aa_profile; | ||
72 | |||
73 | /* struct aa_policy - common part of both namespaces and profiles | ||
74 | * @name: name of the object | ||
75 | * @hname - The hierarchical name | ||
76 | * @count: reference count of the obj | ||
77 | * @list: list policy object is on | ||
78 | * @profiles: head of the profiles list contained in the object | ||
79 | */ | ||
80 | struct aa_policy { | ||
81 | char *name; | ||
82 | char *hname; | ||
83 | struct kref count; | ||
84 | struct list_head list; | ||
85 | struct list_head profiles; | ||
86 | }; | ||
87 | |||
88 | /* struct aa_ns_acct - accounting of profiles in namespace | ||
89 | * @max_size: maximum space allowed for all profiles in namespace | ||
90 | * @max_count: maximum number of profiles that can be in this namespace | ||
91 | * @size: current size of profiles | ||
92 | * @count: current count of profiles (includes null profiles) | ||
93 | */ | ||
94 | struct aa_ns_acct { | ||
95 | int max_size; | ||
96 | int max_count; | ||
97 | int size; | ||
98 | int count; | ||
99 | }; | ||
100 | |||
101 | /* struct aa_namespace - namespace for a set of profiles | ||
102 | * @base: common policy | ||
103 | * @parent: parent of namespace | ||
104 | * @lock: lock for modifying the object | ||
105 | * @acct: accounting for the namespace | ||
106 | * @unconfined: special unconfined profile for the namespace | ||
107 | * @sub_ns: list of namespaces under the current namespace. | ||
108 | * | ||
109 | * An aa_namespace defines the set profiles that are searched to determine | ||
110 | * which profile to attach to a task. Profiles can not be shared between | ||
111 | * aa_namespaces and profile names within a namespace are guaranteed to be | ||
112 | * unique. When profiles in separate namespaces have the same name they | ||
113 | * are NOT considered to be equivalent. | ||
114 | * | ||
115 | * Namespaces are hierarchical and only namespaces and profiles below the | ||
116 | * current namespace are visible. | ||
117 | * | ||
118 | * Namespace names must be unique and can not contain the characters :/\0 | ||
119 | * | ||
120 | * FIXME TODO: add vserver support of namespaces (can it all be done in | ||
121 | * userspace?) | ||
122 | */ | ||
123 | struct aa_namespace { | ||
124 | struct aa_policy base; | ||
125 | struct aa_namespace *parent; | ||
126 | rwlock_t lock; | ||
127 | struct aa_ns_acct acct; | ||
128 | struct aa_profile *unconfined; | ||
129 | struct list_head sub_ns; | ||
130 | }; | ||
131 | |||
132 | /* struct aa_profile - basic confinement data | ||
133 | * @base - base components of the profile (name, refcount, lists, lock ...) | ||
134 | * @parent: parent of profile | ||
135 | * @ns: namespace the profile is in | ||
136 | * @replacedby: is set to the profile that replaced this profile | ||
137 | * @rename: optional profile name that this profile renamed | ||
138 | * @xmatch: optional extended matching for unconfined executables names | ||
139 | * @xmatch_len: xmatch prefix len, used to determine xmatch priority | ||
140 | * @sid: the unique security id number of this profile | ||
141 | * @audit: the auditing mode of the profile | ||
142 | * @mode: the enforcement mode of the profile | ||
143 | * @flags: flags controlling profile behavior | ||
144 | * @path_flags: flags controlling path generation behavior | ||
145 | * @size: the memory consumed by this profiles rules | ||
146 | * @file: The set of rules governing basic file access and domain transitions | ||
147 | * @caps: capabilities for the profile | ||
148 | * @rlimits: rlimits for the profile | ||
149 | * | ||
150 | * The AppArmor profile contains the basic confinement data. Each profile | ||
151 | * has a name, and exists in a namespace. The @name and @exec_match are | ||
152 | * used to determine profile attachment against unconfined tasks. All other | ||
153 | * attachments are determined by profile X transition rules. | ||
154 | * | ||
155 | * The @replacedby field is write protected by the profile lock. Reads | ||
156 | * are assumed to be atomic, and are done without locking. | ||
157 | * | ||
158 | * Profiles have a hierarchy where hats and children profiles keep | ||
159 | * a reference to their parent. | ||
160 | * | ||
161 | * Profile names can not begin with a : and can not contain the \0 | ||
162 | * character. If a profile name begins with / it will be considered when | ||
163 | * determining profile attachment on "unconfined" tasks. | ||
164 | */ | ||
165 | struct aa_profile { | ||
166 | struct aa_policy base; | ||
167 | struct aa_profile *parent; | ||
168 | |||
169 | struct aa_namespace *ns; | ||
170 | struct aa_profile *replacedby; | ||
171 | const char *rename; | ||
172 | |||
173 | struct aa_dfa *xmatch; | ||
174 | int xmatch_len; | ||
175 | u32 sid; | ||
176 | enum audit_mode audit; | ||
177 | enum profile_mode mode; | ||
178 | u32 flags; | ||
179 | u32 path_flags; | ||
180 | int size; | ||
181 | |||
182 | struct aa_file_rules file; | ||
183 | struct aa_caps caps; | ||
184 | struct aa_rlimit rlimits; | ||
185 | }; | ||
186 | |||
187 | extern struct aa_namespace *root_ns; | ||
188 | extern enum profile_mode aa_g_profile_mode; | ||
189 | |||
190 | void aa_add_profile(struct aa_policy *common, struct aa_profile *profile); | ||
191 | |||
192 | bool aa_ns_visible(struct aa_namespace *curr, struct aa_namespace *view); | ||
193 | const char *aa_ns_name(struct aa_namespace *parent, struct aa_namespace *child); | ||
194 | int aa_alloc_root_ns(void); | ||
195 | void aa_free_root_ns(void); | ||
196 | void aa_free_namespace_kref(struct kref *kref); | ||
197 | |||
198 | struct aa_namespace *aa_find_namespace(struct aa_namespace *root, | ||
199 | const char *name); | ||
200 | |||
201 | static inline struct aa_policy *aa_get_common(struct aa_policy *c) | ||
202 | { | ||
203 | if (c) | ||
204 | kref_get(&c->count); | ||
205 | |||
206 | return c; | ||
207 | } | ||
208 | |||
209 | /** | ||
210 | * aa_get_namespace - increment references count on @ns | ||
211 | * @ns: namespace to increment reference count of (MAYBE NULL) | ||
212 | * | ||
213 | * Returns: pointer to @ns, if @ns is NULL returns NULL | ||
214 | * Requires: @ns must be held with valid refcount when called | ||
215 | */ | ||
216 | static inline struct aa_namespace *aa_get_namespace(struct aa_namespace *ns) | ||
217 | { | ||
218 | if (ns) | ||
219 | kref_get(&(ns->base.count)); | ||
220 | |||
221 | return ns; | ||
222 | } | ||
223 | |||
224 | /** | ||
225 | * aa_put_namespace - decrement refcount on @ns | ||
226 | * @ns: namespace to put reference of | ||
227 | * | ||
228 | * Decrement reference count of @ns and if no longer in use free it | ||
229 | */ | ||
230 | static inline void aa_put_namespace(struct aa_namespace *ns) | ||
231 | { | ||
232 | if (ns) | ||
233 | kref_put(&ns->base.count, aa_free_namespace_kref); | ||
234 | } | ||
235 | |||
236 | struct aa_profile *aa_alloc_profile(const char *name); | ||
237 | struct aa_profile *aa_new_null_profile(struct aa_profile *parent, int hat); | ||
238 | void aa_free_profile_kref(struct kref *kref); | ||
239 | struct aa_profile *aa_find_child(struct aa_profile *parent, const char *name); | ||
240 | struct aa_profile *aa_lookup_profile(struct aa_namespace *ns, const char *name); | ||
241 | struct aa_profile *aa_match_profile(struct aa_namespace *ns, const char *name); | ||
242 | |||
243 | ssize_t aa_replace_profiles(void *udata, size_t size, bool noreplace); | ||
244 | ssize_t aa_remove_profiles(char *name, size_t size); | ||
245 | |||
246 | #define PROF_ADD 1 | ||
247 | #define PROF_REPLACE 0 | ||
248 | |||
249 | #define unconfined(X) ((X)->flags & PFLAG_UNCONFINED) | ||
250 | |||
251 | /** | ||
252 | * aa_newest_version - find the newest version of @profile | ||
253 | * @profile: the profile to check for newer versions of (NOT NULL) | ||
254 | * | ||
255 | * Returns: newest version of @profile, if @profile is the newest version | ||
256 | * return @profile. | ||
257 | * | ||
258 | * NOTE: the profile returned is not refcounted, The refcount on @profile | ||
259 | * must be held until the caller decides what to do with the returned newest | ||
260 | * version. | ||
261 | */ | ||
262 | static inline struct aa_profile *aa_newest_version(struct aa_profile *profile) | ||
263 | { | ||
264 | while (profile->replacedby) | ||
265 | profile = profile->replacedby; | ||
266 | |||
267 | return profile; | ||
268 | } | ||
269 | |||
270 | /** | ||
271 | * aa_get_profile - increment refcount on profile @p | ||
272 | * @p: profile (MAYBE NULL) | ||
273 | * | ||
274 | * Returns: pointer to @p if @p is NULL will return NULL | ||
275 | * Requires: @p must be held with valid refcount when called | ||
276 | */ | ||
277 | static inline struct aa_profile *aa_get_profile(struct aa_profile *p) | ||
278 | { | ||
279 | if (p) | ||
280 | kref_get(&(p->base.count)); | ||
281 | |||
282 | return p; | ||
283 | } | ||
284 | |||
285 | /** | ||
286 | * aa_put_profile - decrement refcount on profile @p | ||
287 | * @p: profile (MAYBE NULL) | ||
288 | */ | ||
289 | static inline void aa_put_profile(struct aa_profile *p) | ||
290 | { | ||
291 | if (p) | ||
292 | kref_put(&p->base.count, aa_free_profile_kref); | ||
293 | } | ||
294 | |||
295 | static inline int AUDIT_MODE(struct aa_profile *profile) | ||
296 | { | ||
297 | if (aa_g_audit != AUDIT_NORMAL) | ||
298 | return aa_g_audit; | ||
299 | |||
300 | return profile->audit; | ||
301 | } | ||
302 | |||
303 | bool aa_may_manage_policy(int op); | ||
304 | |||
305 | #endif /* __AA_POLICY_H */ | ||