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