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