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