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