1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * AppArmor security module 4 * 5 * This file contains AppArmor policy definitions. 6 * 7 * Copyright (C) 1998-2008 Novell/SUSE 8 * Copyright 2009-2010 Canonical Ltd. 9 */ 10 11 #ifndef __AA_POLICY_H 12 #define __AA_POLICY_H 13 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> 21 22 #include "apparmor.h" 23 #include "audit.h" 24 #include "capability.h" 25 #include "domain.h" 26 #include "file.h" 27 #include "lib.h" 28 #include "label.h" 29 #include "net.h" 30 #include "perms.h" 31 #include "resource.h" 32 33 34 struct aa_ns; 35 36 extern int unprivileged_userns_apparmor_policy; 37 38 extern const char *const aa_profile_mode_names[]; 39 #define APPARMOR_MODE_NAMES_MAX_INDEX 4 40 41 #define PROFILE_MODE(_profile, _mode) \ 42 ((aa_g_profile_mode == (_mode)) || \ 43 ((_profile)->mode == (_mode))) 44 45 #define COMPLAIN_MODE(_profile) PROFILE_MODE((_profile), APPARMOR_COMPLAIN) 46 47 #define KILL_MODE(_profile) PROFILE_MODE((_profile), APPARMOR_KILL) 48 49 #define PROFILE_IS_HAT(_profile) ((_profile)->label.flags & FLAG_HAT) 50 51 #define CHECK_DEBUG1(_profile) ((_profile)->label.flags & FLAG_DEBUG1) 52 53 #define CHECK_DEBUG2(_profile) ((_profile)->label.flags & FLAG_DEBUG2) 54 55 #define profile_is_stale(_profile) (label_is_stale(&(_profile)->label)) 56 57 #define on_list_rcu(X) (!list_empty(X) && (X)->prev != LIST_POISON2) 58 59 /* 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. 64 */ 65 enum profile_mode { 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 */ 70 }; 71 72 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 76 */ 77 struct aa_policydb { 78 struct aa_dfa *dfa; 79 struct aa_perms *perms; 80 struct aa_domain trans; 81 unsigned int start[AA_CLASS_LAST + 1]; 82 }; 83 84 static inline void aa_destroy_policydb(struct aa_policydb *policy) 85 { 86 aa_put_dfa(policy->dfa); 87 if (policy->perms) 88 kvfree(policy->perms); 89 aa_free_domain_entries(&policy->trans); 90 91 } 92 93 static inline struct aa_perms *aa_lookup_perms(struct aa_policydb *policy, 94 unsigned int state) 95 { 96 unsigned int index = ACCEPT_TABLE(policy->dfa)[state]; 97 98 if (!(policy->perms)) 99 return &default_perms; 100 101 return &(policy->perms[index]); 102 } 103 104 105 /* struct aa_data - generic data structure 106 * key: name for retrieving this data 107 * size: size of data in bytes 108 * data: binary data 109 * head: reserved for rhashtable 110 */ 111 struct aa_data { 112 char *key; 113 u32 size; 114 char *data; 115 struct rhash_head head; 116 }; 117 118 119 /* struct aa_profile - basic confinement data 120 * @base - base components of the profile (name, refcount, lists, lock ...) 121 * @label - label this profile is an extension of 122 * @parent: parent of profile 123 * @ns: namespace the profile is in 124 * @rename: optional profile name that this profile renamed 125 * @attach: human readable attachment string 126 * @xmatch: optional extended matching for unconfined executables names 127 * @xmatch_len: xmatch prefix len, used to determine xmatch priority 128 * @audit: the auditing mode of the profile 129 * @mode: the enforcement mode of the profile 130 * @path_flags: flags controlling path generation behavior 131 * @disconnected: what to prepend if attach_disconnected is specified 132 * @size: the memory consumed by this profiles rules 133 * @policy: general match rules governing policy 134 * @file: The set of rules governing basic file access and domain transitions 135 * @caps: capabilities for the profile 136 * @rlimits: rlimits for the profile 137 * 138 * @dents: dentries for the profiles file entries in apparmorfs 139 * @dirname: name of the profile dir in apparmorfs 140 * @data: hashtable for free-form policy aa_data 141 * 142 * The AppArmor profile contains the basic confinement data. Each profile 143 * has a name, and exists in a namespace. The @name and @exec_match are 144 * used to determine profile attachment against unconfined tasks. All other 145 * attachments are determined by profile X transition rules. 146 * 147 * Profiles have a hierarchy where hats and children profiles keep 148 * a reference to their parent. 149 * 150 * Profile names can not begin with a : and can not contain the \0 151 * character. If a profile name begins with / it will be considered when 152 * determining profile attachment on "unconfined" tasks. 153 */ 154 struct aa_profile { 155 struct aa_policy base; 156 struct aa_profile __rcu *parent; 157 158 struct aa_ns *ns; 159 const char *rename; 160 161 const char *attach; 162 struct aa_policydb xmatch; 163 unsigned int xmatch_len; 164 165 enum audit_mode audit; 166 long mode; 167 u32 path_flags; 168 const char *disconnected; 169 int size; 170 171 struct aa_policydb policy; 172 struct aa_policydb file; 173 struct aa_caps caps; 174 175 int xattr_count; 176 char **xattrs; 177 178 struct aa_rlimit rlimits; 179 180 int secmark_count; 181 struct aa_secmark *secmark; 182 183 struct aa_loaddata *rawdata; 184 unsigned char *hash; 185 char *dirname; 186 struct dentry *dents[AAFS_PROF_SIZEOF]; 187 struct rhashtable *data; 188 struct aa_label label; 189 }; 190 191 extern enum profile_mode aa_g_profile_mode; 192 193 #define AA_MAY_LOAD_POLICY AA_MAY_APPEND 194 #define AA_MAY_REPLACE_POLICY AA_MAY_WRITE 195 #define AA_MAY_REMOVE_POLICY AA_MAY_DELETE 196 197 #define profiles_ns(P) ((P)->ns) 198 #define name_is_shared(A, B) ((A)->hname && (A)->hname == (B)->hname) 199 200 void aa_add_profile(struct aa_policy *common, struct aa_profile *profile); 201 202 203 void aa_free_proxy_kref(struct kref *kref); 204 struct aa_profile *aa_alloc_profile(const char *name, struct aa_proxy *proxy, 205 gfp_t gfp); 206 struct aa_profile *aa_new_null_profile(struct aa_profile *parent, bool hat, 207 const char *base, gfp_t gfp); 208 void aa_free_profile(struct aa_profile *profile); 209 void aa_free_profile_kref(struct kref *kref); 210 struct aa_profile *aa_find_child(struct aa_profile *parent, const char *name); 211 struct aa_profile *aa_lookupn_profile(struct aa_ns *ns, const char *hname, 212 size_t n); 213 struct aa_profile *aa_lookup_profile(struct aa_ns *ns, const char *name); 214 struct aa_profile *aa_fqlookupn_profile(struct aa_label *base, 215 const char *fqname, size_t n); 216 struct aa_profile *aa_match_profile(struct aa_ns *ns, const char *name); 217 218 ssize_t aa_replace_profiles(struct aa_ns *view, struct aa_label *label, 219 u32 mask, struct aa_loaddata *udata); 220 ssize_t aa_remove_profiles(struct aa_ns *view, struct aa_label *label, 221 char *name, size_t size); 222 void __aa_profile_list_release(struct list_head *head); 223 224 #define PROF_ADD 1 225 #define PROF_REPLACE 0 226 227 #define profile_unconfined(X) ((X)->mode == APPARMOR_UNCONFINED) 228 229 /** 230 * aa_get_newest_profile - simple wrapper fn to wrap the label version 231 * @p: profile (NOT NULL) 232 * 233 * Returns refcount to newest version of the profile (maybe @p) 234 * 235 * Requires: @p must be held with a valid refcount 236 */ 237 static inline struct aa_profile *aa_get_newest_profile(struct aa_profile *p) 238 { 239 return labels_profile(aa_get_newest_label(&p->label)); 240 } 241 242 static inline unsigned int PROFILE_MEDIATES(struct aa_profile *profile, 243 unsigned char class) 244 { 245 if (class <= AA_CLASS_LAST) 246 return profile->policy.start[class]; 247 else 248 return aa_dfa_match_len(profile->policy.dfa, 249 profile->policy.start[0], &class, 1); 250 } 251 252 static inline unsigned int PROFILE_MEDIATES_AF(struct aa_profile *profile, 253 u16 AF) { 254 unsigned int state = PROFILE_MEDIATES(profile, AA_CLASS_NET); 255 __be16 be_af = cpu_to_be16(AF); 256 257 if (!state) 258 return 0; 259 return aa_dfa_match_len(profile->policy.dfa, state, (char *) &be_af, 2); 260 } 261 262 /** 263 * aa_get_profile - increment refcount on profile @p 264 * @p: profile (MAYBE NULL) 265 * 266 * Returns: pointer to @p if @p is NULL will return NULL 267 * Requires: @p must be held with valid refcount when called 268 */ 269 static inline struct aa_profile *aa_get_profile(struct aa_profile *p) 270 { 271 if (p) 272 kref_get(&(p->label.count)); 273 274 return p; 275 } 276 277 /** 278 * aa_get_profile_not0 - increment refcount on profile @p found via lookup 279 * @p: profile (MAYBE NULL) 280 * 281 * Returns: pointer to @p if @p is NULL will return NULL 282 * Requires: @p must be held with valid refcount when called 283 */ 284 static inline struct aa_profile *aa_get_profile_not0(struct aa_profile *p) 285 { 286 if (p && kref_get_unless_zero(&p->label.count)) 287 return p; 288 289 return NULL; 290 } 291 292 /** 293 * aa_get_profile_rcu - increment a refcount profile that can be replaced 294 * @p: pointer to profile that can be replaced (NOT NULL) 295 * 296 * Returns: pointer to a refcounted profile. 297 * else NULL if no profile 298 */ 299 static inline struct aa_profile *aa_get_profile_rcu(struct aa_profile __rcu **p) 300 { 301 struct aa_profile *c; 302 303 rcu_read_lock(); 304 do { 305 c = rcu_dereference(*p); 306 } while (c && !kref_get_unless_zero(&c->label.count)); 307 rcu_read_unlock(); 308 309 return c; 310 } 311 312 /** 313 * aa_put_profile - decrement refcount on profile @p 314 * @p: profile (MAYBE NULL) 315 */ 316 static inline void aa_put_profile(struct aa_profile *p) 317 { 318 if (p) 319 kref_put(&p->label.count, aa_label_kref); 320 } 321 322 static inline int AUDIT_MODE(struct aa_profile *profile) 323 { 324 if (aa_g_audit != AUDIT_NORMAL) 325 return aa_g_audit; 326 327 return profile->audit; 328 } 329 330 bool aa_policy_view_capable(struct aa_label *label, struct aa_ns *ns); 331 bool aa_policy_admin_capable(struct aa_label *label, struct aa_ns *ns); 332 int aa_may_manage_policy(struct aa_label *label, struct aa_ns *ns, 333 u32 mask); 334 bool aa_current_policy_view_capable(struct aa_ns *ns); 335 bool aa_current_policy_admin_capable(struct aa_ns *ns); 336 337 #endif /* __AA_POLICY_H */ 338