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 <linux/delay.h> 20 #include <linux/printk.h> 21 #include "flask.h" 22 #include "policycap.h" 23 24 #define SECSID_NULL 0x00000000 /* unspecified SID */ 25 #define SECSID_WILD 0xffffffff /* wildcard SID */ 26 #define SECCLASS_NULL 0x0000 /* no class */ 27 28 /* Identify specific policy version changes */ 29 #define POLICYDB_VERSION_BASE 15 30 #define POLICYDB_VERSION_BOOL 16 31 #define POLICYDB_VERSION_IPV6 17 32 #define POLICYDB_VERSION_NLCLASS 18 33 #define POLICYDB_VERSION_VALIDATETRANS 19 34 #define POLICYDB_VERSION_MLS 19 35 #define POLICYDB_VERSION_AVTAB 20 36 #define POLICYDB_VERSION_RANGETRANS 21 37 #define POLICYDB_VERSION_POLCAP 22 38 #define POLICYDB_VERSION_PERMISSIVE 23 39 #define POLICYDB_VERSION_BOUNDARY 24 40 #define POLICYDB_VERSION_FILENAME_TRANS 25 41 #define POLICYDB_VERSION_ROLETRANS 26 42 #define POLICYDB_VERSION_NEW_OBJECT_DEFAULTS 27 43 #define POLICYDB_VERSION_DEFAULT_TYPE 28 44 #define POLICYDB_VERSION_CONSTRAINT_NAMES 29 45 #define POLICYDB_VERSION_XPERMS_IOCTL 30 46 #define POLICYDB_VERSION_INFINIBAND 31 47 #define POLICYDB_VERSION_GLBLUB 32 48 #define POLICYDB_VERSION_COMP_FTRANS 33 /* compressed filename transitions */ 49 50 /* Range of policy versions we understand*/ 51 #define POLICYDB_VERSION_MIN POLICYDB_VERSION_BASE 52 #define POLICYDB_VERSION_MAX POLICYDB_VERSION_COMP_FTRANS 53 54 /* Mask for just the mount related flags */ 55 #define SE_MNTMASK 0x0f 56 /* Super block security struct flags for mount options */ 57 /* BE CAREFUL, these need to be the low order bits for selinux_get_mnt_opts */ 58 #define CONTEXT_MNT 0x01 59 #define FSCONTEXT_MNT 0x02 60 #define ROOTCONTEXT_MNT 0x04 61 #define DEFCONTEXT_MNT 0x08 62 #define SBLABEL_MNT 0x10 63 /* Non-mount related flags */ 64 #define SE_SBINITIALIZED 0x0100 65 #define SE_SBPROC 0x0200 66 #define SE_SBGENFS 0x0400 67 #define SE_SBGENFS_XATTR 0x0800 68 69 #define CONTEXT_STR "context" 70 #define FSCONTEXT_STR "fscontext" 71 #define ROOTCONTEXT_STR "rootcontext" 72 #define DEFCONTEXT_STR "defcontext" 73 #define SECLABEL_STR "seclabel" 74 75 struct netlbl_lsm_secattr; 76 77 extern int selinux_enabled_boot; 78 79 /* 80 * type_datum properties 81 * available at the kernel policy version >= POLICYDB_VERSION_BOUNDARY 82 */ 83 #define TYPEDATUM_PROPERTY_PRIMARY 0x0001 84 #define TYPEDATUM_PROPERTY_ATTRIBUTE 0x0002 85 86 /* limitation of boundary depth */ 87 #define POLICYDB_BOUNDS_MAXDEPTH 4 88 89 struct selinux_avc; 90 struct selinux_policy; 91 92 struct selinux_state { 93 #ifdef CONFIG_SECURITY_SELINUX_DISABLE 94 bool disabled; 95 #endif 96 #ifdef CONFIG_SECURITY_SELINUX_DEVELOP 97 bool enforcing; 98 #endif 99 bool checkreqprot; 100 bool initialized; 101 bool policycap[__POLICYDB_CAP_MAX]; 102 103 struct page *status_page; 104 struct mutex status_lock; 105 106 struct selinux_avc *avc; 107 struct selinux_policy __rcu *policy; 108 struct mutex policy_mutex; 109 } __randomize_layout; 110 111 void selinux_avc_init(struct selinux_avc **avc); 112 113 extern struct selinux_state selinux_state; 114 115 static inline bool selinux_initialized(const struct selinux_state *state) 116 { 117 /* do a synchronized load to avoid race conditions */ 118 return smp_load_acquire(&state->initialized); 119 } 120 121 static inline void selinux_mark_initialized(struct selinux_state *state) 122 { 123 /* do a synchronized write to avoid race conditions */ 124 smp_store_release(&state->initialized, true); 125 } 126 127 #ifdef CONFIG_SECURITY_SELINUX_DEVELOP 128 static inline bool enforcing_enabled(struct selinux_state *state) 129 { 130 return READ_ONCE(state->enforcing); 131 } 132 133 static inline void enforcing_set(struct selinux_state *state, bool value) 134 { 135 WRITE_ONCE(state->enforcing, value); 136 } 137 #else 138 static inline bool enforcing_enabled(struct selinux_state *state) 139 { 140 return true; 141 } 142 143 static inline void enforcing_set(struct selinux_state *state, bool value) 144 { 145 } 146 #endif 147 148 static inline bool checkreqprot_get(const struct selinux_state *state) 149 { 150 return READ_ONCE(state->checkreqprot); 151 } 152 153 static inline void checkreqprot_set(struct selinux_state *state, bool value) 154 { 155 if (value) 156 pr_err("SELinux: https://github.com/SELinuxProject/selinux-kernel/wiki/DEPRECATE-checkreqprot\n"); 157 WRITE_ONCE(state->checkreqprot, value); 158 } 159 160 #ifdef CONFIG_SECURITY_SELINUX_DISABLE 161 static inline bool selinux_disabled(struct selinux_state *state) 162 { 163 return READ_ONCE(state->disabled); 164 } 165 166 static inline void selinux_mark_disabled(struct selinux_state *state) 167 { 168 WRITE_ONCE(state->disabled, true); 169 } 170 #else 171 static inline bool selinux_disabled(struct selinux_state *state) 172 { 173 return false; 174 } 175 #endif 176 177 static inline bool selinux_policycap_netpeer(void) 178 { 179 struct selinux_state *state = &selinux_state; 180 181 return READ_ONCE(state->policycap[POLICYDB_CAP_NETPEER]); 182 } 183 184 static inline bool selinux_policycap_openperm(void) 185 { 186 struct selinux_state *state = &selinux_state; 187 188 return READ_ONCE(state->policycap[POLICYDB_CAP_OPENPERM]); 189 } 190 191 static inline bool selinux_policycap_extsockclass(void) 192 { 193 struct selinux_state *state = &selinux_state; 194 195 return READ_ONCE(state->policycap[POLICYDB_CAP_EXTSOCKCLASS]); 196 } 197 198 static inline bool selinux_policycap_alwaysnetwork(void) 199 { 200 struct selinux_state *state = &selinux_state; 201 202 return READ_ONCE(state->policycap[POLICYDB_CAP_ALWAYSNETWORK]); 203 } 204 205 static inline bool selinux_policycap_cgroupseclabel(void) 206 { 207 struct selinux_state *state = &selinux_state; 208 209 return READ_ONCE(state->policycap[POLICYDB_CAP_CGROUPSECLABEL]); 210 } 211 212 static inline bool selinux_policycap_nnp_nosuid_transition(void) 213 { 214 struct selinux_state *state = &selinux_state; 215 216 return READ_ONCE(state->policycap[POLICYDB_CAP_NNP_NOSUID_TRANSITION]); 217 } 218 219 static inline bool selinux_policycap_genfs_seclabel_symlinks(void) 220 { 221 struct selinux_state *state = &selinux_state; 222 223 return READ_ONCE(state->policycap[POLICYDB_CAP_GENFS_SECLABEL_SYMLINKS]); 224 } 225 226 static inline bool selinux_policycap_ioctl_skip_cloexec(void) 227 { 228 struct selinux_state *state = &selinux_state; 229 230 return READ_ONCE(state->policycap[POLICYDB_CAP_IOCTL_SKIP_CLOEXEC]); 231 } 232 233 struct selinux_policy_convert_data; 234 235 struct selinux_load_state { 236 struct selinux_policy *policy; 237 struct selinux_policy_convert_data *convert_data; 238 }; 239 240 int security_mls_enabled(struct selinux_state *state); 241 int security_load_policy(struct selinux_state *state, 242 void *data, size_t len, 243 struct selinux_load_state *load_state); 244 void selinux_policy_commit(struct selinux_state *state, 245 struct selinux_load_state *load_state); 246 void selinux_policy_cancel(struct selinux_state *state, 247 struct selinux_load_state *load_state); 248 int security_read_policy(struct selinux_state *state, 249 void **data, size_t *len); 250 int security_read_state_kernel(struct selinux_state *state, 251 void **data, size_t *len); 252 int security_policycap_supported(struct selinux_state *state, 253 unsigned int req_cap); 254 255 #define SEL_VEC_MAX 32 256 struct av_decision { 257 u32 allowed; 258 u32 auditallow; 259 u32 auditdeny; 260 u32 seqno; 261 u32 flags; 262 }; 263 264 #define XPERMS_ALLOWED 1 265 #define XPERMS_AUDITALLOW 2 266 #define XPERMS_DONTAUDIT 4 267 268 #define security_xperm_set(perms, x) ((perms)[(x) >> 5] |= 1 << ((x) & 0x1f)) 269 #define security_xperm_test(perms, x) (1 & ((perms)[(x) >> 5] >> ((x) & 0x1f))) 270 struct extended_perms_data { 271 u32 p[8]; 272 }; 273 274 struct extended_perms_decision { 275 u8 used; 276 u8 driver; 277 struct extended_perms_data *allowed; 278 struct extended_perms_data *auditallow; 279 struct extended_perms_data *dontaudit; 280 }; 281 282 struct extended_perms { 283 u16 len; /* length associated decision chain */ 284 struct extended_perms_data drivers; /* flag drivers that are used */ 285 }; 286 287 /* definitions of av_decision.flags */ 288 #define AVD_FLAGS_PERMISSIVE 0x0001 289 290 void security_compute_av(struct selinux_state *state, 291 u32 ssid, u32 tsid, 292 u16 tclass, struct av_decision *avd, 293 struct extended_perms *xperms); 294 295 void security_compute_xperms_decision(struct selinux_state *state, 296 u32 ssid, u32 tsid, u16 tclass, 297 u8 driver, 298 struct extended_perms_decision *xpermd); 299 300 void security_compute_av_user(struct selinux_state *state, 301 u32 ssid, u32 tsid, 302 u16 tclass, struct av_decision *avd); 303 304 int security_transition_sid(struct selinux_state *state, 305 u32 ssid, u32 tsid, u16 tclass, 306 const struct qstr *qstr, u32 *out_sid); 307 308 int security_transition_sid_user(struct selinux_state *state, 309 u32 ssid, u32 tsid, u16 tclass, 310 const char *objname, u32 *out_sid); 311 312 int security_member_sid(struct selinux_state *state, u32 ssid, u32 tsid, 313 u16 tclass, u32 *out_sid); 314 315 int security_change_sid(struct selinux_state *state, u32 ssid, u32 tsid, 316 u16 tclass, u32 *out_sid); 317 318 int security_sid_to_context(struct selinux_state *state, u32 sid, 319 char **scontext, u32 *scontext_len); 320 321 int security_sid_to_context_force(struct selinux_state *state, 322 u32 sid, char **scontext, u32 *scontext_len); 323 324 int security_sid_to_context_inval(struct selinux_state *state, 325 u32 sid, char **scontext, u32 *scontext_len); 326 327 int security_context_to_sid(struct selinux_state *state, 328 const char *scontext, u32 scontext_len, 329 u32 *out_sid, gfp_t gfp); 330 331 int security_context_str_to_sid(struct selinux_state *state, 332 const char *scontext, u32 *out_sid, gfp_t gfp); 333 334 int security_context_to_sid_default(struct selinux_state *state, 335 const char *scontext, u32 scontext_len, 336 u32 *out_sid, u32 def_sid, gfp_t gfp_flags); 337 338 int security_context_to_sid_force(struct selinux_state *state, 339 const char *scontext, u32 scontext_len, 340 u32 *sid); 341 342 int security_get_user_sids(struct selinux_state *state, 343 u32 callsid, char *username, 344 u32 **sids, u32 *nel); 345 346 int security_port_sid(struct selinux_state *state, 347 u8 protocol, u16 port, u32 *out_sid); 348 349 int security_ib_pkey_sid(struct selinux_state *state, 350 u64 subnet_prefix, u16 pkey_num, u32 *out_sid); 351 352 int security_ib_endport_sid(struct selinux_state *state, 353 const char *dev_name, u8 port_num, u32 *out_sid); 354 355 int security_netif_sid(struct selinux_state *state, 356 char *name, u32 *if_sid); 357 358 int security_node_sid(struct selinux_state *state, 359 u16 domain, void *addr, u32 addrlen, 360 u32 *out_sid); 361 362 int security_validate_transition(struct selinux_state *state, 363 u32 oldsid, u32 newsid, u32 tasksid, 364 u16 tclass); 365 366 int security_validate_transition_user(struct selinux_state *state, 367 u32 oldsid, u32 newsid, u32 tasksid, 368 u16 tclass); 369 370 int security_bounded_transition(struct selinux_state *state, 371 u32 oldsid, u32 newsid); 372 373 int security_sid_mls_copy(struct selinux_state *state, 374 u32 sid, u32 mls_sid, u32 *new_sid); 375 376 int security_net_peersid_resolve(struct selinux_state *state, 377 u32 nlbl_sid, u32 nlbl_type, 378 u32 xfrm_sid, 379 u32 *peer_sid); 380 381 int security_get_classes(struct selinux_policy *policy, 382 char ***classes, int *nclasses); 383 int security_get_permissions(struct selinux_policy *policy, 384 char *class, char ***perms, int *nperms); 385 int security_get_reject_unknown(struct selinux_state *state); 386 int security_get_allow_unknown(struct selinux_state *state); 387 388 #define SECURITY_FS_USE_XATTR 1 /* use xattr */ 389 #define SECURITY_FS_USE_TRANS 2 /* use transition SIDs, e.g. devpts/tmpfs */ 390 #define SECURITY_FS_USE_TASK 3 /* use task SIDs, e.g. pipefs/sockfs */ 391 #define SECURITY_FS_USE_GENFS 4 /* use the genfs support */ 392 #define SECURITY_FS_USE_NONE 5 /* no labeling support */ 393 #define SECURITY_FS_USE_MNTPOINT 6 /* use mountpoint labeling */ 394 #define SECURITY_FS_USE_NATIVE 7 /* use native label support */ 395 #define SECURITY_FS_USE_MAX 7 /* Highest SECURITY_FS_USE_XXX */ 396 397 int security_fs_use(struct selinux_state *state, struct super_block *sb); 398 399 int security_genfs_sid(struct selinux_state *state, 400 const char *fstype, const char *path, u16 sclass, 401 u32 *sid); 402 403 int selinux_policy_genfs_sid(struct selinux_policy *policy, 404 const char *fstype, const char *path, u16 sclass, 405 u32 *sid); 406 407 #ifdef CONFIG_NETLABEL 408 int security_netlbl_secattr_to_sid(struct selinux_state *state, 409 struct netlbl_lsm_secattr *secattr, 410 u32 *sid); 411 412 int security_netlbl_sid_to_secattr(struct selinux_state *state, 413 u32 sid, 414 struct netlbl_lsm_secattr *secattr); 415 #else 416 static inline int security_netlbl_secattr_to_sid(struct selinux_state *state, 417 struct netlbl_lsm_secattr *secattr, 418 u32 *sid) 419 { 420 return -EIDRM; 421 } 422 423 static inline int security_netlbl_sid_to_secattr(struct selinux_state *state, 424 u32 sid, 425 struct netlbl_lsm_secattr *secattr) 426 { 427 return -ENOENT; 428 } 429 #endif /* CONFIG_NETLABEL */ 430 431 const char *security_get_initial_sid_context(u32 sid); 432 433 /* 434 * status notifier using mmap interface 435 */ 436 extern struct page *selinux_kernel_status_page(struct selinux_state *state); 437 438 #define SELINUX_KERNEL_STATUS_VERSION 1 439 struct selinux_kernel_status { 440 u32 version; /* version number of the structure */ 441 u32 sequence; /* sequence number of seqlock logic */ 442 u32 enforcing; /* current setting of enforcing mode */ 443 u32 policyload; /* times of policy reloaded */ 444 u32 deny_unknown; /* current setting of deny_unknown */ 445 /* 446 * The version > 0 supports above members. 447 */ 448 } __packed; 449 450 extern void selinux_status_update_setenforce(struct selinux_state *state, 451 int enforcing); 452 extern void selinux_status_update_policyload(struct selinux_state *state, 453 int seqno); 454 extern void selinux_complete_init(void); 455 extern int selinux_disable(struct selinux_state *state); 456 extern void exit_sel_fs(void); 457 extern struct path selinux_null; 458 extern void selnl_notify_setenforce(int val); 459 extern void selnl_notify_policyload(u32 seqno); 460 extern int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm); 461 462 extern void avtab_cache_init(void); 463 extern void ebitmap_cache_init(void); 464 extern void hashtab_cache_init(void); 465 extern int security_sidtab_hash_stats(struct selinux_state *state, char *page); 466 467 #endif /* _SELINUX_SECURITY_H_ */ 468