1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * Security server interface. 4 * 5 * Author : Stephen Smalley, <stephen.smalley.work@gmail.com> 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 #define POLICYDB_VERSION_COND_XPERMS 34 /* extended permissions in conditional policies */ 50 #define POLICYDB_VERSION_NEVERAUDIT 35 /* neveraudit types */ 51 52 /* Range of policy versions we understand*/ 53 #define POLICYDB_VERSION_MIN POLICYDB_VERSION_BASE 54 #define POLICYDB_VERSION_MAX POLICYDB_VERSION_NEVERAUDIT 55 56 /* Mask for just the mount related flags */ 57 #define SE_MNTMASK 0x0f 58 /* Super block security struct flags for mount options */ 59 /* BE CAREFUL, these need to be the low order bits for selinux_get_mnt_opts */ 60 #define CONTEXT_MNT 0x01 61 #define FSCONTEXT_MNT 0x02 62 #define ROOTCONTEXT_MNT 0x04 63 #define DEFCONTEXT_MNT 0x08 64 #define SBLABEL_MNT 0x10 65 /* Non-mount related flags */ 66 #define SE_SBINITIALIZED 0x0100 67 #define SE_SBPROC 0x0200 68 #define SE_SBGENFS 0x0400 69 #define SE_SBGENFS_XATTR 0x0800 70 #define SE_SBNATIVE 0x1000 71 72 #define CONTEXT_STR "context" 73 #define FSCONTEXT_STR "fscontext" 74 #define ROOTCONTEXT_STR "rootcontext" 75 #define DEFCONTEXT_STR "defcontext" 76 #define SECLABEL_STR "seclabel" 77 78 struct netlbl_lsm_secattr; 79 80 extern int selinux_enabled_boot; 81 82 /* 83 * type_datum properties 84 * available at the kernel policy version >= POLICYDB_VERSION_BOUNDARY 85 */ 86 #define TYPEDATUM_PROPERTY_PRIMARY 0x0001 87 #define TYPEDATUM_PROPERTY_ATTRIBUTE 0x0002 88 89 /* limitation of boundary depth */ 90 #define POLICYDB_BOUNDS_MAXDEPTH 4 91 92 struct selinux_policy; 93 94 struct selinux_state { 95 #ifdef CONFIG_SECURITY_SELINUX_DEVELOP 96 bool enforcing; 97 #endif 98 bool initialized; 99 bool policycap[__POLICYDB_CAP_MAX]; 100 101 struct page *status_page; 102 struct mutex status_lock; 103 104 struct selinux_policy __rcu *policy; 105 struct mutex policy_mutex; 106 } __randomize_layout; 107 108 void selinux_avc_init(void); 109 110 extern struct selinux_state selinux_state; 111 112 static inline bool selinux_initialized(void) 113 { 114 /* do a synchronized load to avoid race conditions */ 115 return smp_load_acquire(&selinux_state.initialized); 116 } 117 118 static inline void selinux_mark_initialized(void) 119 { 120 /* do a synchronized write to avoid race conditions */ 121 smp_store_release(&selinux_state.initialized, true); 122 } 123 124 #ifdef CONFIG_SECURITY_SELINUX_DEVELOP 125 static inline bool enforcing_enabled(void) 126 { 127 return READ_ONCE(selinux_state.enforcing); 128 } 129 130 static inline void enforcing_set(bool value) 131 { 132 WRITE_ONCE(selinux_state.enforcing, value); 133 } 134 #else 135 static inline bool enforcing_enabled(void) 136 { 137 return true; 138 } 139 140 static inline void enforcing_set(bool value) 141 { 142 } 143 #endif 144 145 static inline bool checkreqprot_get(void) 146 { 147 /* non-zero/true checkreqprot values are no longer supported */ 148 return 0; 149 } 150 151 static inline bool selinux_policycap_netpeer(void) 152 { 153 return READ_ONCE(selinux_state.policycap[POLICYDB_CAP_NETPEER]); 154 } 155 156 static inline bool selinux_policycap_openperm(void) 157 { 158 return READ_ONCE(selinux_state.policycap[POLICYDB_CAP_OPENPERM]); 159 } 160 161 static inline bool selinux_policycap_extsockclass(void) 162 { 163 return READ_ONCE(selinux_state.policycap[POLICYDB_CAP_EXTSOCKCLASS]); 164 } 165 166 static inline bool selinux_policycap_alwaysnetwork(void) 167 { 168 return READ_ONCE(selinux_state.policycap[POLICYDB_CAP_ALWAYSNETWORK]); 169 } 170 171 static inline bool selinux_policycap_cgroupseclabel(void) 172 { 173 return READ_ONCE(selinux_state.policycap[POLICYDB_CAP_CGROUPSECLABEL]); 174 } 175 176 static inline bool selinux_policycap_nnp_nosuid_transition(void) 177 { 178 return READ_ONCE( 179 selinux_state.policycap[POLICYDB_CAP_NNP_NOSUID_TRANSITION]); 180 } 181 182 static inline bool selinux_policycap_genfs_seclabel_symlinks(void) 183 { 184 return READ_ONCE( 185 selinux_state.policycap[POLICYDB_CAP_GENFS_SECLABEL_SYMLINKS]); 186 } 187 188 static inline bool selinux_policycap_ioctl_skip_cloexec(void) 189 { 190 return READ_ONCE( 191 selinux_state.policycap[POLICYDB_CAP_IOCTL_SKIP_CLOEXEC]); 192 } 193 194 static inline bool selinux_policycap_userspace_initial_context(void) 195 { 196 return READ_ONCE( 197 selinux_state.policycap[POLICYDB_CAP_USERSPACE_INITIAL_CONTEXT]); 198 } 199 200 static inline bool selinux_policycap_netlink_xperm(void) 201 { 202 return READ_ONCE( 203 selinux_state.policycap[POLICYDB_CAP_NETLINK_XPERM]); 204 } 205 206 static inline bool selinux_policycap_functionfs_seclabel(void) 207 { 208 return READ_ONCE( 209 selinux_state.policycap[POLICYDB_CAP_FUNCTIONFS_SECLABEL]); 210 } 211 212 static inline bool selinux_policycap_memfd_class(void) 213 { 214 return READ_ONCE(selinux_state.policycap[POLICYDB_CAP_MEMFD_CLASS]); 215 } 216 217 static inline bool selinux_policycap_bpf_token_perms(void) 218 { 219 return READ_ONCE( 220 selinux_state.policycap[POLICYDB_CAP_BPF_TOKEN_PERMS]); 221 } 222 223 struct selinux_policy_convert_data; 224 225 struct selinux_load_state { 226 struct selinux_policy *policy; 227 struct selinux_policy_convert_data *convert_data; 228 }; 229 230 int security_mls_enabled(void); 231 int security_load_policy(void *data, size_t len, 232 struct selinux_load_state *load_state); 233 void selinux_policy_commit(struct selinux_load_state *load_state); 234 void selinux_policy_cancel(struct selinux_load_state *load_state); 235 int security_read_policy(void **data, size_t *len); 236 int security_read_state_kernel(void **data, size_t *len); 237 int security_policycap_supported(unsigned int req_cap); 238 239 #define SEL_VEC_MAX 32 240 struct av_decision { 241 u32 allowed; 242 u32 auditallow; 243 u32 auditdeny; 244 u32 seqno; 245 u32 flags; 246 }; 247 248 #define XPERMS_ALLOWED 1 249 #define XPERMS_AUDITALLOW 2 250 #define XPERMS_DONTAUDIT 4 251 252 #define security_xperm_set(perms, x) ((perms)[(x) >> 5] |= 1 << ((x)&0x1f)) 253 #define security_xperm_test(perms, x) (1 & ((perms)[(x) >> 5] >> ((x)&0x1f))) 254 struct extended_perms_data { 255 u32 p[8]; 256 }; 257 258 struct extended_perms_decision { 259 u8 used; 260 u8 driver; 261 u8 base_perm; 262 struct extended_perms_data *allowed; 263 struct extended_perms_data *auditallow; 264 struct extended_perms_data *dontaudit; 265 }; 266 267 struct extended_perms { 268 u16 len; /* length associated decision chain */ 269 u8 base_perms; /* which base permissions are covered */ 270 struct extended_perms_data drivers; /* flag drivers that are used */ 271 }; 272 273 /* definitions of av_decision.flags */ 274 #define AVD_FLAGS_PERMISSIVE 0x0001 275 #define AVD_FLAGS_NEVERAUDIT 0x0002 276 277 void security_compute_av(u32 ssid, u32 tsid, u16 tclass, 278 struct av_decision *avd, 279 struct extended_perms *xperms); 280 281 void security_compute_xperms_decision(u32 ssid, u32 tsid, u16 tclass, u8 driver, 282 u8 base_perm, 283 struct extended_perms_decision *xpermd); 284 285 void security_compute_av_user(u32 ssid, u32 tsid, u16 tclass, 286 struct av_decision *avd); 287 288 int security_transition_sid(u32 ssid, u32 tsid, u16 tclass, 289 const struct qstr *qstr, u32 *out_sid); 290 291 int security_transition_sid_user(u32 ssid, u32 tsid, u16 tclass, 292 const char *objname, u32 *out_sid); 293 294 int security_member_sid(u32 ssid, u32 tsid, u16 tclass, u32 *out_sid); 295 296 int security_change_sid(u32 ssid, u32 tsid, u16 tclass, u32 *out_sid); 297 298 int security_sid_to_context(u32 sid, char **scontext, u32 *scontext_len); 299 300 int security_sid_to_context_force(u32 sid, char **scontext, u32 *scontext_len); 301 302 int security_sid_to_context_inval(u32 sid, char **scontext, u32 *scontext_len); 303 304 int security_context_to_sid(const char *scontext, u32 scontext_len, 305 u32 *out_sid, gfp_t gfp); 306 307 int security_context_str_to_sid(const char *scontext, u32 *out_sid, gfp_t gfp); 308 309 int security_context_to_sid_default(const char *scontext, u32 scontext_len, 310 u32 *out_sid, u32 def_sid, gfp_t gfp_flags); 311 312 int security_context_to_sid_force(const char *scontext, u32 scontext_len, 313 u32 *sid); 314 315 int security_get_user_sids(u32 fromsid, const char *username, u32 **sids, u32 *nel); 316 317 int security_port_sid(u8 protocol, u16 port, u32 *out_sid); 318 319 int security_ib_pkey_sid(u64 subnet_prefix, u16 pkey_num, u32 *out_sid); 320 321 int security_ib_endport_sid(const char *dev_name, u8 port_num, u32 *out_sid); 322 323 int security_netif_sid(const char *name, u32 *if_sid); 324 325 int security_node_sid(u16 domain, const void *addr, u32 addrlen, u32 *out_sid); 326 327 int security_validate_transition(u32 oldsid, u32 newsid, u32 tasksid, 328 u16 tclass); 329 330 int security_validate_transition_user(u32 oldsid, u32 newsid, u32 tasksid, 331 u16 tclass); 332 333 int security_bounded_transition(u32 old_sid, u32 new_sid); 334 335 int security_sid_mls_copy(u32 sid, u32 mls_sid, u32 *new_sid); 336 337 int security_net_peersid_resolve(u32 nlbl_sid, u32 nlbl_type, u32 xfrm_sid, 338 u32 *peer_sid); 339 340 int security_get_classes(struct selinux_policy *policy, char ***classes, 341 u32 *nclasses); 342 int security_get_permissions(struct selinux_policy *policy, const char *class, 343 char ***perms, u32 *nperms); 344 int security_get_reject_unknown(void); 345 int security_get_allow_unknown(void); 346 347 #define SECURITY_FS_USE_XATTR 1 /* use xattr */ 348 #define SECURITY_FS_USE_TRANS 2 /* use transition SIDs, e.g. devpts/tmpfs */ 349 #define SECURITY_FS_USE_TASK 3 /* use task SIDs, e.g. pipefs/sockfs */ 350 #define SECURITY_FS_USE_GENFS 4 /* use the genfs support */ 351 #define SECURITY_FS_USE_NONE 5 /* no labeling support */ 352 #define SECURITY_FS_USE_MNTPOINT 6 /* use mountpoint labeling */ 353 #define SECURITY_FS_USE_NATIVE 7 /* use native label support */ 354 #define SECURITY_FS_USE_MAX 7 /* Highest SECURITY_FS_USE_XXX */ 355 356 int security_fs_use(struct super_block *sb); 357 358 int security_genfs_sid(const char *fstype, const char *path, u16 sclass, 359 u32 *sid); 360 361 int selinux_policy_genfs_sid(struct selinux_policy *policy, const char *fstype, 362 const char *path, u16 sclass, u32 *sid); 363 364 #ifdef CONFIG_NETLABEL 365 int security_netlbl_secattr_to_sid(struct netlbl_lsm_secattr *secattr, 366 u32 *sid); 367 368 int security_netlbl_sid_to_secattr(u32 sid, struct netlbl_lsm_secattr *secattr); 369 #else 370 static inline int 371 security_netlbl_secattr_to_sid(struct netlbl_lsm_secattr *secattr, u32 *sid) 372 { 373 return -EIDRM; 374 } 375 376 static inline int 377 security_netlbl_sid_to_secattr(u32 sid, struct netlbl_lsm_secattr *secattr) 378 { 379 return -ENOENT; 380 } 381 #endif /* CONFIG_NETLABEL */ 382 383 const char *security_get_initial_sid_context(u32 sid); 384 385 /* 386 * status notifier using mmap interface 387 */ 388 extern struct page *selinux_kernel_status_page(void); 389 390 #define SELINUX_KERNEL_STATUS_VERSION 1 391 struct selinux_kernel_status { 392 u32 version; /* version number of the structure */ 393 u32 sequence; /* sequence number of seqlock logic */ 394 u32 enforcing; /* current setting of enforcing mode */ 395 u32 policyload; /* times of policy reloaded */ 396 u32 deny_unknown; /* current setting of deny_unknown */ 397 /* 398 * The version > 0 supports above members. 399 */ 400 } __packed; 401 402 extern void selinux_status_update_setenforce(bool enforcing); 403 extern void selinux_status_update_policyload(u32 seqno); 404 extern void selinux_complete_init(void); 405 extern struct path selinux_null; 406 extern void selnl_notify_setenforce(int val); 407 extern void selnl_notify_policyload(u32 seqno); 408 extern int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm); 409 410 extern void avtab_cache_init(void); 411 extern void ebitmap_cache_init(void); 412 extern void hashtab_cache_init(void); 413 extern int security_sidtab_hash_stats(char *page); 414 415 #endif /* _SELINUX_SECURITY_H_ */ 416