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 profile_is_stale(_profile) (label_is_stale(&(_profile)->label)) 52 53 #define on_list_rcu(X) (!list_empty(X) && (X)->prev != LIST_POISON2) 54 55 /* 56 * FIXME: currently need a clean way to replace and remove profiles as a 57 * set. It should be done at the namespace level. 58 * Either, with a set of profiles loaded at the namespace level or via 59 * a mark and remove marked interface. 60 */ 61 enum profile_mode { 62 APPARMOR_ENFORCE, /* enforce access rules */ 63 APPARMOR_COMPLAIN, /* allow and log access violations */ 64 APPARMOR_KILL, /* kill task on access violation */ 65 APPARMOR_UNCONFINED, /* profile set to unconfined */ 66 }; 67 68 69 /* struct aa_policydb - match engine for a policy 70 * dfa: dfa pattern match 71 * start: set of start states for the different classes of data 72 */ 73 struct aa_policydb { 74 /* Generic policy DFA specific rule types will be subsections of it */ 75 struct aa_dfa *dfa; 76 unsigned int start[AA_CLASS_LAST + 1]; 77 78 }; 79 80 /* struct aa_data - generic data structure 81 * key: name for retrieving this data 82 * size: size of data in bytes 83 * data: binary data 84 * head: reserved for rhashtable 85 */ 86 struct aa_data { 87 char *key; 88 u32 size; 89 char *data; 90 struct rhash_head head; 91 }; 92 93 94 /* struct aa_profile - basic confinement data 95 * @base - base components of the profile (name, refcount, lists, lock ...) 96 * @label - label this profile is an extension of 97 * @parent: parent of profile 98 * @ns: namespace the profile is in 99 * @rename: optional profile name that this profile renamed 100 * @attach: human readable attachment string 101 * @xmatch: optional extended matching for unconfined executables names 102 * @xmatch_len: xmatch prefix len, used to determine xmatch priority 103 * @audit: the auditing mode of the profile 104 * @mode: the enforcement mode of the profile 105 * @path_flags: flags controlling path generation behavior 106 * @disconnected: what to prepend if attach_disconnected is specified 107 * @size: the memory consumed by this profiles rules 108 * @policy: general match rules governing policy 109 * @file: The set of rules governing basic file access and domain transitions 110 * @caps: capabilities for the profile 111 * @rlimits: rlimits for the profile 112 * 113 * @dents: dentries for the profiles file entries in apparmorfs 114 * @dirname: name of the profile dir in apparmorfs 115 * @data: hashtable for free-form policy aa_data 116 * 117 * The AppArmor profile contains the basic confinement data. Each profile 118 * has a name, and exists in a namespace. The @name and @exec_match are 119 * used to determine profile attachment against unconfined tasks. All other 120 * attachments are determined by profile X transition rules. 121 * 122 * Profiles have a hierarchy where hats and children profiles keep 123 * a reference to their parent. 124 * 125 * Profile names can not begin with a : and can not contain the \0 126 * character. If a profile name begins with / it will be considered when 127 * determining profile attachment on "unconfined" tasks. 128 */ 129 struct aa_profile { 130 struct aa_policy base; 131 struct aa_profile __rcu *parent; 132 133 struct aa_ns *ns; 134 const char *rename; 135 136 const char *attach; 137 struct aa_dfa *xmatch; 138 int xmatch_len; 139 enum audit_mode audit; 140 long mode; 141 u32 path_flags; 142 const char *disconnected; 143 int size; 144 145 struct aa_policydb policy; 146 struct aa_file_rules file; 147 struct aa_caps caps; 148 149 int xattr_count; 150 char **xattrs; 151 152 struct aa_rlimit rlimits; 153 154 int secmark_count; 155 struct aa_secmark *secmark; 156 157 struct aa_loaddata *rawdata; 158 unsigned char *hash; 159 char *dirname; 160 struct dentry *dents[AAFS_PROF_SIZEOF]; 161 struct rhashtable *data; 162 struct aa_label label; 163 }; 164 165 extern enum profile_mode aa_g_profile_mode; 166 167 #define AA_MAY_LOAD_POLICY AA_MAY_APPEND 168 #define AA_MAY_REPLACE_POLICY AA_MAY_WRITE 169 #define AA_MAY_REMOVE_POLICY AA_MAY_DELETE 170 171 #define profiles_ns(P) ((P)->ns) 172 #define name_is_shared(A, B) ((A)->hname && (A)->hname == (B)->hname) 173 174 void aa_add_profile(struct aa_policy *common, struct aa_profile *profile); 175 176 177 void aa_free_proxy_kref(struct kref *kref); 178 struct aa_profile *aa_alloc_profile(const char *name, struct aa_proxy *proxy, 179 gfp_t gfp); 180 struct aa_profile *aa_new_null_profile(struct aa_profile *parent, bool hat, 181 const char *base, gfp_t gfp); 182 void aa_free_profile(struct aa_profile *profile); 183 void aa_free_profile_kref(struct kref *kref); 184 struct aa_profile *aa_find_child(struct aa_profile *parent, const char *name); 185 struct aa_profile *aa_lookupn_profile(struct aa_ns *ns, const char *hname, 186 size_t n); 187 struct aa_profile *aa_lookup_profile(struct aa_ns *ns, const char *name); 188 struct aa_profile *aa_fqlookupn_profile(struct aa_label *base, 189 const char *fqname, size_t n); 190 struct aa_profile *aa_match_profile(struct aa_ns *ns, const char *name); 191 192 ssize_t aa_replace_profiles(struct aa_ns *view, struct aa_label *label, 193 u32 mask, struct aa_loaddata *udata); 194 ssize_t aa_remove_profiles(struct aa_ns *view, struct aa_label *label, 195 char *name, size_t size); 196 void __aa_profile_list_release(struct list_head *head); 197 198 #define PROF_ADD 1 199 #define PROF_REPLACE 0 200 201 #define profile_unconfined(X) ((X)->mode == APPARMOR_UNCONFINED) 202 203 /** 204 * aa_get_newest_profile - simple wrapper fn to wrap the label version 205 * @p: profile (NOT NULL) 206 * 207 * Returns refcount to newest version of the profile (maybe @p) 208 * 209 * Requires: @p must be held with a valid refcount 210 */ 211 static inline struct aa_profile *aa_get_newest_profile(struct aa_profile *p) 212 { 213 return labels_profile(aa_get_newest_label(&p->label)); 214 } 215 216 static inline unsigned int PROFILE_MEDIATES(struct aa_profile *profile, 217 unsigned char class) 218 { 219 if (class <= AA_CLASS_LAST) 220 return profile->policy.start[class]; 221 else 222 return aa_dfa_match_len(profile->policy.dfa, 223 profile->policy.start[0], &class, 1); 224 } 225 226 static inline unsigned int PROFILE_MEDIATES_AF(struct aa_profile *profile, 227 u16 AF) { 228 unsigned int state = PROFILE_MEDIATES(profile, AA_CLASS_NET); 229 __be16 be_af = cpu_to_be16(AF); 230 231 if (!state) 232 return 0; 233 return aa_dfa_match_len(profile->policy.dfa, state, (char *) &be_af, 2); 234 } 235 236 /** 237 * aa_get_profile - increment refcount on profile @p 238 * @p: profile (MAYBE NULL) 239 * 240 * Returns: pointer to @p if @p is NULL will return NULL 241 * Requires: @p must be held with valid refcount when called 242 */ 243 static inline struct aa_profile *aa_get_profile(struct aa_profile *p) 244 { 245 if (p) 246 kref_get(&(p->label.count)); 247 248 return p; 249 } 250 251 /** 252 * aa_get_profile_not0 - increment refcount on profile @p found via lookup 253 * @p: profile (MAYBE NULL) 254 * 255 * Returns: pointer to @p if @p is NULL will return NULL 256 * Requires: @p must be held with valid refcount when called 257 */ 258 static inline struct aa_profile *aa_get_profile_not0(struct aa_profile *p) 259 { 260 if (p && kref_get_unless_zero(&p->label.count)) 261 return p; 262 263 return NULL; 264 } 265 266 /** 267 * aa_get_profile_rcu - increment a refcount profile that can be replaced 268 * @p: pointer to profile that can be replaced (NOT NULL) 269 * 270 * Returns: pointer to a refcounted profile. 271 * else NULL if no profile 272 */ 273 static inline struct aa_profile *aa_get_profile_rcu(struct aa_profile __rcu **p) 274 { 275 struct aa_profile *c; 276 277 rcu_read_lock(); 278 do { 279 c = rcu_dereference(*p); 280 } while (c && !kref_get_unless_zero(&c->label.count)); 281 rcu_read_unlock(); 282 283 return c; 284 } 285 286 /** 287 * aa_put_profile - decrement refcount on profile @p 288 * @p: profile (MAYBE NULL) 289 */ 290 static inline void aa_put_profile(struct aa_profile *p) 291 { 292 if (p) 293 kref_put(&p->label.count, aa_label_kref); 294 } 295 296 static inline int AUDIT_MODE(struct aa_profile *profile) 297 { 298 if (aa_g_audit != AUDIT_NORMAL) 299 return aa_g_audit; 300 301 return profile->audit; 302 } 303 304 bool aa_policy_view_capable(struct aa_label *label, struct aa_ns *ns); 305 bool aa_policy_admin_capable(struct aa_label *label, struct aa_ns *ns); 306 int aa_may_manage_policy(struct aa_label *label, struct aa_ns *ns, 307 u32 mask); 308 bool aa_current_policy_view_capable(struct aa_ns *ns); 309 bool aa_current_policy_admin_capable(struct aa_ns *ns); 310 311 #endif /* __AA_POLICY_H */ 312