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); 232 233 int security_policycap_supported(struct selinux_state *state, 234 unsigned int req_cap); 235 236 #define SEL_VEC_MAX 32 237 struct av_decision { 238 u32 allowed; 239 u32 auditallow; 240 u32 auditdeny; 241 u32 seqno; 242 u32 flags; 243 }; 244 245 #define XPERMS_ALLOWED 1 246 #define XPERMS_AUDITALLOW 2 247 #define XPERMS_DONTAUDIT 4 248 249 #define security_xperm_set(perms, x) (perms[x >> 5] |= 1 << (x & 0x1f)) 250 #define security_xperm_test(perms, x) (1 & (perms[x >> 5] >> (x & 0x1f))) 251 struct extended_perms_data { 252 u32 p[8]; 253 }; 254 255 struct extended_perms_decision { 256 u8 used; 257 u8 driver; 258 struct extended_perms_data *allowed; 259 struct extended_perms_data *auditallow; 260 struct extended_perms_data *dontaudit; 261 }; 262 263 struct extended_perms { 264 u16 len; /* length associated decision chain */ 265 struct extended_perms_data drivers; /* flag drivers that are used */ 266 }; 267 268 /* definitions of av_decision.flags */ 269 #define AVD_FLAGS_PERMISSIVE 0x0001 270 271 void security_compute_av(struct selinux_state *state, 272 u32 ssid, u32 tsid, 273 u16 tclass, struct av_decision *avd, 274 struct extended_perms *xperms); 275 276 void security_compute_xperms_decision(struct selinux_state *state, 277 u32 ssid, u32 tsid, u16 tclass, 278 u8 driver, 279 struct extended_perms_decision *xpermd); 280 281 void security_compute_av_user(struct selinux_state *state, 282 u32 ssid, u32 tsid, 283 u16 tclass, struct av_decision *avd); 284 285 int security_transition_sid(struct selinux_state *state, 286 u32 ssid, u32 tsid, u16 tclass, 287 const struct qstr *qstr, u32 *out_sid); 288 289 int security_transition_sid_user(struct selinux_state *state, 290 u32 ssid, u32 tsid, u16 tclass, 291 const char *objname, u32 *out_sid); 292 293 int security_member_sid(struct selinux_state *state, u32 ssid, u32 tsid, 294 u16 tclass, u32 *out_sid); 295 296 int security_change_sid(struct selinux_state *state, u32 ssid, u32 tsid, 297 u16 tclass, u32 *out_sid); 298 299 int security_sid_to_context(struct selinux_state *state, u32 sid, 300 char **scontext, u32 *scontext_len); 301 302 int security_sid_to_context_force(struct selinux_state *state, 303 u32 sid, char **scontext, u32 *scontext_len); 304 305 int security_sid_to_context_inval(struct selinux_state *state, 306 u32 sid, char **scontext, u32 *scontext_len); 307 308 int security_context_to_sid(struct selinux_state *state, 309 const char *scontext, u32 scontext_len, 310 u32 *out_sid, gfp_t gfp); 311 312 int security_context_str_to_sid(struct selinux_state *state, 313 const char *scontext, u32 *out_sid, gfp_t gfp); 314 315 int security_context_to_sid_default(struct selinux_state *state, 316 const char *scontext, u32 scontext_len, 317 u32 *out_sid, u32 def_sid, gfp_t gfp_flags); 318 319 int security_context_to_sid_force(struct selinux_state *state, 320 const char *scontext, u32 scontext_len, 321 u32 *sid); 322 323 int security_get_user_sids(struct selinux_state *state, 324 u32 callsid, char *username, 325 u32 **sids, u32 *nel); 326 327 int security_port_sid(struct selinux_state *state, 328 u8 protocol, u16 port, u32 *out_sid); 329 330 int security_ib_pkey_sid(struct selinux_state *state, 331 u64 subnet_prefix, u16 pkey_num, u32 *out_sid); 332 333 int security_ib_endport_sid(struct selinux_state *state, 334 const char *dev_name, u8 port_num, u32 *out_sid); 335 336 int security_netif_sid(struct selinux_state *state, 337 char *name, u32 *if_sid); 338 339 int security_node_sid(struct selinux_state *state, 340 u16 domain, void *addr, u32 addrlen, 341 u32 *out_sid); 342 343 int security_validate_transition(struct selinux_state *state, 344 u32 oldsid, u32 newsid, u32 tasksid, 345 u16 tclass); 346 347 int security_validate_transition_user(struct selinux_state *state, 348 u32 oldsid, u32 newsid, u32 tasksid, 349 u16 tclass); 350 351 int security_bounded_transition(struct selinux_state *state, 352 u32 oldsid, u32 newsid); 353 354 int security_sid_mls_copy(struct selinux_state *state, 355 u32 sid, u32 mls_sid, u32 *new_sid); 356 357 int security_net_peersid_resolve(struct selinux_state *state, 358 u32 nlbl_sid, u32 nlbl_type, 359 u32 xfrm_sid, 360 u32 *peer_sid); 361 362 int security_get_classes(struct selinux_policy *policy, 363 char ***classes, int *nclasses); 364 int security_get_permissions(struct selinux_policy *policy, 365 char *class, char ***perms, int *nperms); 366 int security_get_reject_unknown(struct selinux_state *state); 367 int security_get_allow_unknown(struct selinux_state *state); 368 369 #define SECURITY_FS_USE_XATTR 1 /* use xattr */ 370 #define SECURITY_FS_USE_TRANS 2 /* use transition SIDs, e.g. devpts/tmpfs */ 371 #define SECURITY_FS_USE_TASK 3 /* use task SIDs, e.g. pipefs/sockfs */ 372 #define SECURITY_FS_USE_GENFS 4 /* use the genfs support */ 373 #define SECURITY_FS_USE_NONE 5 /* no labeling support */ 374 #define SECURITY_FS_USE_MNTPOINT 6 /* use mountpoint labeling */ 375 #define SECURITY_FS_USE_NATIVE 7 /* use native label support */ 376 #define SECURITY_FS_USE_MAX 7 /* Highest SECURITY_FS_USE_XXX */ 377 378 int security_fs_use(struct selinux_state *state, struct super_block *sb); 379 380 int security_genfs_sid(struct selinux_state *state, 381 const char *fstype, char *name, u16 sclass, 382 u32 *sid); 383 384 int selinux_policy_genfs_sid(struct selinux_policy *policy, 385 const char *fstype, char *name, u16 sclass, 386 u32 *sid); 387 388 #ifdef CONFIG_NETLABEL 389 int security_netlbl_secattr_to_sid(struct selinux_state *state, 390 struct netlbl_lsm_secattr *secattr, 391 u32 *sid); 392 393 int security_netlbl_sid_to_secattr(struct selinux_state *state, 394 u32 sid, 395 struct netlbl_lsm_secattr *secattr); 396 #else 397 static inline int security_netlbl_secattr_to_sid(struct selinux_state *state, 398 struct netlbl_lsm_secattr *secattr, 399 u32 *sid) 400 { 401 return -EIDRM; 402 } 403 404 static inline int security_netlbl_sid_to_secattr(struct selinux_state *state, 405 u32 sid, 406 struct netlbl_lsm_secattr *secattr) 407 { 408 return -ENOENT; 409 } 410 #endif /* CONFIG_NETLABEL */ 411 412 const char *security_get_initial_sid_context(u32 sid); 413 414 /* 415 * status notifier using mmap interface 416 */ 417 extern struct page *selinux_kernel_status_page(struct selinux_state *state); 418 419 #define SELINUX_KERNEL_STATUS_VERSION 1 420 struct selinux_kernel_status { 421 u32 version; /* version number of thie structure */ 422 u32 sequence; /* sequence number of seqlock logic */ 423 u32 enforcing; /* current setting of enforcing mode */ 424 u32 policyload; /* times of policy reloaded */ 425 u32 deny_unknown; /* current setting of deny_unknown */ 426 /* 427 * The version > 0 supports above members. 428 */ 429 } __packed; 430 431 extern void selinux_status_update_setenforce(struct selinux_state *state, 432 int enforcing); 433 extern void selinux_status_update_policyload(struct selinux_state *state, 434 int seqno); 435 extern void selinux_complete_init(void); 436 extern int selinux_disable(struct selinux_state *state); 437 extern void exit_sel_fs(void); 438 extern struct path selinux_null; 439 extern struct vfsmount *selinuxfs_mount; 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