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