1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * Security server interface. 4 * 5 * Author : Stephen Smalley, <sds@tycho.nsa.gov> 6 * 7 */ 8 9 #ifndef _SELINUX_SECURITY_H_ 10 #define _SELINUX_SECURITY_H_ 11 12 #include <linux/compiler.h> 13 #include <linux/dcache.h> 14 #include <linux/magic.h> 15 #include <linux/types.h> 16 #include <linux/rcupdate.h> 17 #include <linux/refcount.h> 18 #include <linux/workqueue.h> 19 #include "flask.h" 20 #include "policycap.h" 21 22 #define SECSID_NULL 0x00000000 /* unspecified SID */ 23 #define SECSID_WILD 0xffffffff /* wildcard SID */ 24 #define SECCLASS_NULL 0x0000 /* no class */ 25 26 /* Identify specific policy version changes */ 27 #define POLICYDB_VERSION_BASE 15 28 #define POLICYDB_VERSION_BOOL 16 29 #define POLICYDB_VERSION_IPV6 17 30 #define POLICYDB_VERSION_NLCLASS 18 31 #define POLICYDB_VERSION_VALIDATETRANS 19 32 #define POLICYDB_VERSION_MLS 19 33 #define POLICYDB_VERSION_AVTAB 20 34 #define POLICYDB_VERSION_RANGETRANS 21 35 #define POLICYDB_VERSION_POLCAP 22 36 #define POLICYDB_VERSION_PERMISSIVE 23 37 #define POLICYDB_VERSION_BOUNDARY 24 38 #define POLICYDB_VERSION_FILENAME_TRANS 25 39 #define POLICYDB_VERSION_ROLETRANS 26 40 #define POLICYDB_VERSION_NEW_OBJECT_DEFAULTS 27 41 #define POLICYDB_VERSION_DEFAULT_TYPE 28 42 #define POLICYDB_VERSION_CONSTRAINT_NAMES 29 43 #define POLICYDB_VERSION_XPERMS_IOCTL 30 44 #define POLICYDB_VERSION_INFINIBAND 31 45 #define POLICYDB_VERSION_GLBLUB 32 46 #define POLICYDB_VERSION_COMP_FTRANS 33 /* compressed filename transitions */ 47 48 /* Range of policy versions we understand*/ 49 #define POLICYDB_VERSION_MIN POLICYDB_VERSION_BASE 50 #define POLICYDB_VERSION_MAX POLICYDB_VERSION_COMP_FTRANS 51 52 /* Mask for just the mount related flags */ 53 #define SE_MNTMASK 0x0f 54 /* Super block security struct flags for mount options */ 55 /* BE CAREFUL, these need to be the low order bits for selinux_get_mnt_opts */ 56 #define CONTEXT_MNT 0x01 57 #define FSCONTEXT_MNT 0x02 58 #define ROOTCONTEXT_MNT 0x04 59 #define DEFCONTEXT_MNT 0x08 60 #define SBLABEL_MNT 0x10 61 /* Non-mount related flags */ 62 #define SE_SBINITIALIZED 0x0100 63 #define SE_SBPROC 0x0200 64 #define SE_SBGENFS 0x0400 65 #define SE_SBGENFS_XATTR 0x0800 66 67 #define CONTEXT_STR "context" 68 #define FSCONTEXT_STR "fscontext" 69 #define ROOTCONTEXT_STR "rootcontext" 70 #define DEFCONTEXT_STR "defcontext" 71 #define SECLABEL_STR "seclabel" 72 73 struct netlbl_lsm_secattr; 74 75 extern int selinux_enabled_boot; 76 77 /* 78 * type_datum properties 79 * available at the kernel policy version >= POLICYDB_VERSION_BOUNDARY 80 */ 81 #define TYPEDATUM_PROPERTY_PRIMARY 0x0001 82 #define TYPEDATUM_PROPERTY_ATTRIBUTE 0x0002 83 84 /* limitation of boundary depth */ 85 #define POLICYDB_BOUNDS_MAXDEPTH 4 86 87 struct selinux_avc; 88 struct selinux_policy; 89 90 struct selinux_state { 91 #ifdef CONFIG_SECURITY_SELINUX_DISABLE 92 bool disabled; 93 #endif 94 #ifdef CONFIG_SECURITY_SELINUX_DEVELOP 95 bool enforcing; 96 #endif 97 bool checkreqprot; 98 bool initialized; 99 bool policycap[__POLICYDB_CAPABILITY_MAX]; 100 101 struct page *status_page; 102 struct mutex status_lock; 103 104 struct selinux_avc *avc; 105 struct selinux_policy __rcu *policy; 106 struct mutex policy_mutex; 107 } __randomize_layout; 108 109 void selinux_avc_init(struct selinux_avc **avc); 110 111 extern struct selinux_state selinux_state; 112 113 static inline bool selinux_initialized(const struct selinux_state *state) 114 { 115 /* do a synchronized load to avoid race conditions */ 116 return smp_load_acquire(&state->initialized); 117 } 118 119 static inline void selinux_mark_initialized(struct selinux_state *state) 120 { 121 /* do a synchronized write to avoid race conditions */ 122 smp_store_release(&state->initialized, true); 123 } 124 125 #ifdef CONFIG_SECURITY_SELINUX_DEVELOP 126 static inline bool enforcing_enabled(struct selinux_state *state) 127 { 128 return READ_ONCE(state->enforcing); 129 } 130 131 static inline void enforcing_set(struct selinux_state *state, bool value) 132 { 133 WRITE_ONCE(state->enforcing, value); 134 } 135 #else 136 static inline bool enforcing_enabled(struct selinux_state *state) 137 { 138 return true; 139 } 140 141 static inline void enforcing_set(struct selinux_state *state, bool value) 142 { 143 } 144 #endif 145 146 static inline bool checkreqprot_get(const struct selinux_state *state) 147 { 148 return READ_ONCE(state->checkreqprot); 149 } 150 151 static inline void checkreqprot_set(struct selinux_state *state, bool value) 152 { 153 WRITE_ONCE(state->checkreqprot, value); 154 } 155 156 #ifdef CONFIG_SECURITY_SELINUX_DISABLE 157 static inline bool selinux_disabled(struct selinux_state *state) 158 { 159 return READ_ONCE(state->disabled); 160 } 161 162 static inline void selinux_mark_disabled(struct selinux_state *state) 163 { 164 WRITE_ONCE(state->disabled, true); 165 } 166 #else 167 static inline bool selinux_disabled(struct selinux_state *state) 168 { 169 return false; 170 } 171 #endif 172 173 static inline bool selinux_policycap_netpeer(void) 174 { 175 struct selinux_state *state = &selinux_state; 176 177 return READ_ONCE(state->policycap[POLICYDB_CAPABILITY_NETPEER]); 178 } 179 180 static inline bool selinux_policycap_openperm(void) 181 { 182 struct selinux_state *state = &selinux_state; 183 184 return READ_ONCE(state->policycap[POLICYDB_CAPABILITY_OPENPERM]); 185 } 186 187 static inline bool selinux_policycap_extsockclass(void) 188 { 189 struct selinux_state *state = &selinux_state; 190 191 return READ_ONCE(state->policycap[POLICYDB_CAPABILITY_EXTSOCKCLASS]); 192 } 193 194 static inline bool selinux_policycap_alwaysnetwork(void) 195 { 196 struct selinux_state *state = &selinux_state; 197 198 return READ_ONCE(state->policycap[POLICYDB_CAPABILITY_ALWAYSNETWORK]); 199 } 200 201 static inline bool selinux_policycap_cgroupseclabel(void) 202 { 203 struct selinux_state *state = &selinux_state; 204 205 return READ_ONCE(state->policycap[POLICYDB_CAPABILITY_CGROUPSECLABEL]); 206 } 207 208 static inline bool selinux_policycap_nnp_nosuid_transition(void) 209 { 210 struct selinux_state *state = &selinux_state; 211 212 return READ_ONCE(state->policycap[POLICYDB_CAPABILITY_NNP_NOSUID_TRANSITION]); 213 } 214 215 static inline bool selinux_policycap_genfs_seclabel_symlinks(void) 216 { 217 struct selinux_state *state = &selinux_state; 218 219 return READ_ONCE(state->policycap[POLICYDB_CAPABILITY_GENFS_SECLABEL_SYMLINKS]); 220 } 221 222 int security_mls_enabled(struct selinux_state *state); 223 int security_load_policy(struct selinux_state *state, 224 void *data, size_t len, 225 struct selinux_policy **newpolicyp); 226 void selinux_policy_commit(struct selinux_state *state, 227 struct selinux_policy *newpolicy); 228 void selinux_policy_cancel(struct selinux_state *state, 229 struct selinux_policy *policy); 230 int security_read_policy(struct selinux_state *state, 231 void **data, size_t *len); 232 int security_read_state_kernel(struct selinux_state *state, 233 void **data, size_t *len); 234 int security_policycap_supported(struct selinux_state *state, 235 unsigned int req_cap); 236 237 #define SEL_VEC_MAX 32 238 struct av_decision { 239 u32 allowed; 240 u32 auditallow; 241 u32 auditdeny; 242 u32 seqno; 243 u32 flags; 244 }; 245 246 #define XPERMS_ALLOWED 1 247 #define XPERMS_AUDITALLOW 2 248 #define XPERMS_DONTAUDIT 4 249 250 #define security_xperm_set(perms, x) (perms[x >> 5] |= 1 << (x & 0x1f)) 251 #define security_xperm_test(perms, x) (1 & (perms[x >> 5] >> (x & 0x1f))) 252 struct extended_perms_data { 253 u32 p[8]; 254 }; 255 256 struct extended_perms_decision { 257 u8 used; 258 u8 driver; 259 struct extended_perms_data *allowed; 260 struct extended_perms_data *auditallow; 261 struct extended_perms_data *dontaudit; 262 }; 263 264 struct extended_perms { 265 u16 len; /* length associated decision chain */ 266 struct extended_perms_data drivers; /* flag drivers that are used */ 267 }; 268 269 /* definitions of av_decision.flags */ 270 #define AVD_FLAGS_PERMISSIVE 0x0001 271 272 void security_compute_av(struct selinux_state *state, 273 u32 ssid, u32 tsid, 274 u16 tclass, struct av_decision *avd, 275 struct extended_perms *xperms); 276 277 void security_compute_xperms_decision(struct selinux_state *state, 278 u32 ssid, u32 tsid, u16 tclass, 279 u8 driver, 280 struct extended_perms_decision *xpermd); 281 282 void security_compute_av_user(struct selinux_state *state, 283 u32 ssid, u32 tsid, 284 u16 tclass, struct av_decision *avd); 285 286 int security_transition_sid(struct selinux_state *state, 287 u32 ssid, u32 tsid, u16 tclass, 288 const struct qstr *qstr, u32 *out_sid); 289 290 int security_transition_sid_user(struct selinux_state *state, 291 u32 ssid, u32 tsid, u16 tclass, 292 const char *objname, u32 *out_sid); 293 294 int security_member_sid(struct selinux_state *state, u32 ssid, u32 tsid, 295 u16 tclass, u32 *out_sid); 296 297 int security_change_sid(struct selinux_state *state, u32 ssid, u32 tsid, 298 u16 tclass, u32 *out_sid); 299 300 int security_sid_to_context(struct selinux_state *state, u32 sid, 301 char **scontext, u32 *scontext_len); 302 303 int security_sid_to_context_force(struct selinux_state *state, 304 u32 sid, char **scontext, u32 *scontext_len); 305 306 int security_sid_to_context_inval(struct selinux_state *state, 307 u32 sid, char **scontext, u32 *scontext_len); 308 309 int security_context_to_sid(struct selinux_state *state, 310 const char *scontext, u32 scontext_len, 311 u32 *out_sid, gfp_t gfp); 312 313 int security_context_str_to_sid(struct selinux_state *state, 314 const char *scontext, u32 *out_sid, gfp_t gfp); 315 316 int security_context_to_sid_default(struct selinux_state *state, 317 const char *scontext, u32 scontext_len, 318 u32 *out_sid, u32 def_sid, gfp_t gfp_flags); 319 320 int security_context_to_sid_force(struct selinux_state *state, 321 const char *scontext, u32 scontext_len, 322 u32 *sid); 323 324 int security_get_user_sids(struct selinux_state *state, 325 u32 callsid, char *username, 326 u32 **sids, u32 *nel); 327 328 int security_port_sid(struct selinux_state *state, 329 u8 protocol, u16 port, u32 *out_sid); 330 331 int security_ib_pkey_sid(struct selinux_state *state, 332 u64 subnet_prefix, u16 pkey_num, u32 *out_sid); 333 334 int security_ib_endport_sid(struct selinux_state *state, 335 const char *dev_name, u8 port_num, u32 *out_sid); 336 337 int security_netif_sid(struct selinux_state *state, 338 char *name, u32 *if_sid); 339 340 int security_node_sid(struct selinux_state *state, 341 u16 domain, void *addr, u32 addrlen, 342 u32 *out_sid); 343 344 int security_validate_transition(struct selinux_state *state, 345 u32 oldsid, u32 newsid, u32 tasksid, 346 u16 tclass); 347 348 int security_validate_transition_user(struct selinux_state *state, 349 u32 oldsid, u32 newsid, u32 tasksid, 350 u16 tclass); 351 352 int security_bounded_transition(struct selinux_state *state, 353 u32 oldsid, u32 newsid); 354 355 int security_sid_mls_copy(struct selinux_state *state, 356 u32 sid, u32 mls_sid, u32 *new_sid); 357 358 int security_net_peersid_resolve(struct selinux_state *state, 359 u32 nlbl_sid, u32 nlbl_type, 360 u32 xfrm_sid, 361 u32 *peer_sid); 362 363 int security_get_classes(struct selinux_policy *policy, 364 char ***classes, int *nclasses); 365 int security_get_permissions(struct selinux_policy *policy, 366 char *class, char ***perms, int *nperms); 367 int security_get_reject_unknown(struct selinux_state *state); 368 int security_get_allow_unknown(struct selinux_state *state); 369 370 #define SECURITY_FS_USE_XATTR 1 /* use xattr */ 371 #define SECURITY_FS_USE_TRANS 2 /* use transition SIDs, e.g. devpts/tmpfs */ 372 #define SECURITY_FS_USE_TASK 3 /* use task SIDs, e.g. pipefs/sockfs */ 373 #define SECURITY_FS_USE_GENFS 4 /* use the genfs support */ 374 #define SECURITY_FS_USE_NONE 5 /* no labeling support */ 375 #define SECURITY_FS_USE_MNTPOINT 6 /* use mountpoint labeling */ 376 #define SECURITY_FS_USE_NATIVE 7 /* use native label support */ 377 #define SECURITY_FS_USE_MAX 7 /* Highest SECURITY_FS_USE_XXX */ 378 379 int security_fs_use(struct selinux_state *state, struct super_block *sb); 380 381 int security_genfs_sid(struct selinux_state *state, 382 const char *fstype, char *name, u16 sclass, 383 u32 *sid); 384 385 int selinux_policy_genfs_sid(struct selinux_policy *policy, 386 const char *fstype, char *name, u16 sclass, 387 u32 *sid); 388 389 #ifdef CONFIG_NETLABEL 390 int security_netlbl_secattr_to_sid(struct selinux_state *state, 391 struct netlbl_lsm_secattr *secattr, 392 u32 *sid); 393 394 int security_netlbl_sid_to_secattr(struct selinux_state *state, 395 u32 sid, 396 struct netlbl_lsm_secattr *secattr); 397 #else 398 static inline int security_netlbl_secattr_to_sid(struct selinux_state *state, 399 struct netlbl_lsm_secattr *secattr, 400 u32 *sid) 401 { 402 return -EIDRM; 403 } 404 405 static inline int security_netlbl_sid_to_secattr(struct selinux_state *state, 406 u32 sid, 407 struct netlbl_lsm_secattr *secattr) 408 { 409 return -ENOENT; 410 } 411 #endif /* CONFIG_NETLABEL */ 412 413 const char *security_get_initial_sid_context(u32 sid); 414 415 /* 416 * status notifier using mmap interface 417 */ 418 extern struct page *selinux_kernel_status_page(struct selinux_state *state); 419 420 #define SELINUX_KERNEL_STATUS_VERSION 1 421 struct selinux_kernel_status { 422 u32 version; /* version number of thie structure */ 423 u32 sequence; /* sequence number of seqlock logic */ 424 u32 enforcing; /* current setting of enforcing mode */ 425 u32 policyload; /* times of policy reloaded */ 426 u32 deny_unknown; /* current setting of deny_unknown */ 427 /* 428 * The version > 0 supports above members. 429 */ 430 } __packed; 431 432 extern void selinux_status_update_setenforce(struct selinux_state *state, 433 int enforcing); 434 extern void selinux_status_update_policyload(struct selinux_state *state, 435 int seqno); 436 extern void selinux_complete_init(void); 437 extern int selinux_disable(struct selinux_state *state); 438 extern void exit_sel_fs(void); 439 extern struct path selinux_null; 440 extern void selnl_notify_setenforce(int val); 441 extern void selnl_notify_policyload(u32 seqno); 442 extern int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm); 443 444 extern void avtab_cache_init(void); 445 extern void ebitmap_cache_init(void); 446 extern void hashtab_cache_init(void); 447 extern int security_sidtab_hash_stats(struct selinux_state *state, char *page); 448 449 #endif /* _SELINUX_SECURITY_H_ */ 450