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 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 #define SE_SBNATIVE 0x1000 69 70 #define CONTEXT_STR "context" 71 #define FSCONTEXT_STR "fscontext" 72 #define ROOTCONTEXT_STR "rootcontext" 73 #define DEFCONTEXT_STR "defcontext" 74 #define SECLABEL_STR "seclabel" 75 76 struct netlbl_lsm_secattr; 77 78 extern int selinux_enabled_boot; 79 80 /* 81 * type_datum properties 82 * available at the kernel policy version >= POLICYDB_VERSION_BOUNDARY 83 */ 84 #define TYPEDATUM_PROPERTY_PRIMARY 0x0001 85 #define TYPEDATUM_PROPERTY_ATTRIBUTE 0x0002 86 87 /* limitation of boundary depth */ 88 #define POLICYDB_BOUNDS_MAXDEPTH 4 89 90 struct selinux_policy; 91 92 struct selinux_state { 93 #ifdef CONFIG_SECURITY_SELINUX_DEVELOP 94 bool enforcing; 95 #endif 96 bool initialized; 97 bool policycap[__POLICYDB_CAP_MAX]; 98 99 struct page *status_page; 100 struct mutex status_lock; 101 102 struct selinux_policy __rcu *policy; 103 struct mutex policy_mutex; 104 } __randomize_layout; 105 106 void selinux_avc_init(void); 107 108 extern struct selinux_state selinux_state; 109 110 static inline bool selinux_initialized(void) 111 { 112 /* do a synchronized load to avoid race conditions */ 113 return smp_load_acquire(&selinux_state.initialized); 114 } 115 116 static inline void selinux_mark_initialized(void) 117 { 118 /* do a synchronized write to avoid race conditions */ 119 smp_store_release(&selinux_state.initialized, true); 120 } 121 122 #ifdef CONFIG_SECURITY_SELINUX_DEVELOP 123 static inline bool enforcing_enabled(void) 124 { 125 return READ_ONCE(selinux_state.enforcing); 126 } 127 128 static inline void enforcing_set(bool value) 129 { 130 WRITE_ONCE(selinux_state.enforcing, value); 131 } 132 #else 133 static inline bool enforcing_enabled(void) 134 { 135 return true; 136 } 137 138 static inline void enforcing_set(bool value) 139 { 140 } 141 #endif 142 143 static inline bool checkreqprot_get(void) 144 { 145 /* non-zero/true checkreqprot values are no longer supported */ 146 return 0; 147 } 148 149 static inline bool selinux_policycap_netpeer(void) 150 { 151 return READ_ONCE(selinux_state.policycap[POLICYDB_CAP_NETPEER]); 152 } 153 154 static inline bool selinux_policycap_openperm(void) 155 { 156 return READ_ONCE(selinux_state.policycap[POLICYDB_CAP_OPENPERM]); 157 } 158 159 static inline bool selinux_policycap_extsockclass(void) 160 { 161 return READ_ONCE(selinux_state.policycap[POLICYDB_CAP_EXTSOCKCLASS]); 162 } 163 164 static inline bool selinux_policycap_alwaysnetwork(void) 165 { 166 return READ_ONCE(selinux_state.policycap[POLICYDB_CAP_ALWAYSNETWORK]); 167 } 168 169 static inline bool selinux_policycap_cgroupseclabel(void) 170 { 171 return READ_ONCE(selinux_state.policycap[POLICYDB_CAP_CGROUPSECLABEL]); 172 } 173 174 static inline bool selinux_policycap_nnp_nosuid_transition(void) 175 { 176 return READ_ONCE( 177 selinux_state.policycap[POLICYDB_CAP_NNP_NOSUID_TRANSITION]); 178 } 179 180 static inline bool selinux_policycap_genfs_seclabel_symlinks(void) 181 { 182 return READ_ONCE( 183 selinux_state.policycap[POLICYDB_CAP_GENFS_SECLABEL_SYMLINKS]); 184 } 185 186 static inline bool selinux_policycap_ioctl_skip_cloexec(void) 187 { 188 return READ_ONCE( 189 selinux_state.policycap[POLICYDB_CAP_IOCTL_SKIP_CLOEXEC]); 190 } 191 192 static inline bool selinux_policycap_userspace_initial_context(void) 193 { 194 return READ_ONCE( 195 selinux_state.policycap[POLICYDB_CAP_USERSPACE_INITIAL_CONTEXT]); 196 } 197 198 static inline bool selinux_policycap_netlink_xperm(void) 199 { 200 return READ_ONCE( 201 selinux_state.policycap[POLICYDB_CAP_NETLINK_XPERM]); 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, u16 tclass, 256 struct av_decision *avd, 257 struct extended_perms *xperms); 258 259 void security_compute_xperms_decision(u32 ssid, u32 tsid, u16 tclass, u8 driver, 260 struct extended_perms_decision *xpermd); 261 262 void security_compute_av_user(u32 ssid, u32 tsid, u16 tclass, 263 struct av_decision *avd); 264 265 int security_transition_sid(u32 ssid, u32 tsid, u16 tclass, 266 const struct qstr *qstr, u32 *out_sid); 267 268 int security_transition_sid_user(u32 ssid, u32 tsid, u16 tclass, 269 const char *objname, u32 *out_sid); 270 271 int security_member_sid(u32 ssid, u32 tsid, u16 tclass, u32 *out_sid); 272 273 int security_change_sid(u32 ssid, u32 tsid, u16 tclass, u32 *out_sid); 274 275 int security_sid_to_context(u32 sid, char **scontext, u32 *scontext_len); 276 277 int security_sid_to_context_force(u32 sid, char **scontext, u32 *scontext_len); 278 279 int security_sid_to_context_inval(u32 sid, char **scontext, u32 *scontext_len); 280 281 int security_context_to_sid(const char *scontext, u32 scontext_len, 282 u32 *out_sid, gfp_t gfp); 283 284 int security_context_str_to_sid(const char *scontext, u32 *out_sid, gfp_t gfp); 285 286 int security_context_to_sid_default(const char *scontext, u32 scontext_len, 287 u32 *out_sid, u32 def_sid, gfp_t gfp_flags); 288 289 int security_context_to_sid_force(const char *scontext, u32 scontext_len, 290 u32 *sid); 291 292 int security_get_user_sids(u32 callsid, char *username, u32 **sids, u32 *nel); 293 294 int security_port_sid(u8 protocol, u16 port, u32 *out_sid); 295 296 int security_ib_pkey_sid(u64 subnet_prefix, u16 pkey_num, u32 *out_sid); 297 298 int security_ib_endport_sid(const char *dev_name, u8 port_num, u32 *out_sid); 299 300 int security_netif_sid(char *name, u32 *if_sid); 301 302 int security_node_sid(u16 domain, void *addr, u32 addrlen, u32 *out_sid); 303 304 int security_validate_transition(u32 oldsid, u32 newsid, u32 tasksid, 305 u16 tclass); 306 307 int security_validate_transition_user(u32 oldsid, u32 newsid, u32 tasksid, 308 u16 tclass); 309 310 int security_bounded_transition(u32 oldsid, u32 newsid); 311 312 int security_sid_mls_copy(u32 sid, u32 mls_sid, u32 *new_sid); 313 314 int security_net_peersid_resolve(u32 nlbl_sid, u32 nlbl_type, u32 xfrm_sid, 315 u32 *peer_sid); 316 317 int security_get_classes(struct selinux_policy *policy, char ***classes, 318 u32 *nclasses); 319 int security_get_permissions(struct selinux_policy *policy, const char *class, 320 char ***perms, u32 *nperms); 321 int security_get_reject_unknown(void); 322 int security_get_allow_unknown(void); 323 324 #define SECURITY_FS_USE_XATTR 1 /* use xattr */ 325 #define SECURITY_FS_USE_TRANS 2 /* use transition SIDs, e.g. devpts/tmpfs */ 326 #define SECURITY_FS_USE_TASK 3 /* use task SIDs, e.g. pipefs/sockfs */ 327 #define SECURITY_FS_USE_GENFS 4 /* use the genfs support */ 328 #define SECURITY_FS_USE_NONE 5 /* no labeling support */ 329 #define SECURITY_FS_USE_MNTPOINT 6 /* use mountpoint labeling */ 330 #define SECURITY_FS_USE_NATIVE 7 /* use native label support */ 331 #define SECURITY_FS_USE_MAX 7 /* Highest SECURITY_FS_USE_XXX */ 332 333 int security_fs_use(struct super_block *sb); 334 335 int security_genfs_sid(const char *fstype, const char *path, u16 sclass, 336 u32 *sid); 337 338 int selinux_policy_genfs_sid(struct selinux_policy *policy, const char *fstype, 339 const char *path, u16 sclass, u32 *sid); 340 341 #ifdef CONFIG_NETLABEL 342 int security_netlbl_secattr_to_sid(struct netlbl_lsm_secattr *secattr, 343 u32 *sid); 344 345 int security_netlbl_sid_to_secattr(u32 sid, struct netlbl_lsm_secattr *secattr); 346 #else 347 static inline int 348 security_netlbl_secattr_to_sid(struct netlbl_lsm_secattr *secattr, u32 *sid) 349 { 350 return -EIDRM; 351 } 352 353 static inline int 354 security_netlbl_sid_to_secattr(u32 sid, struct netlbl_lsm_secattr *secattr) 355 { 356 return -ENOENT; 357 } 358 #endif /* CONFIG_NETLABEL */ 359 360 const char *security_get_initial_sid_context(u32 sid); 361 362 /* 363 * status notifier using mmap interface 364 */ 365 extern struct page *selinux_kernel_status_page(void); 366 367 #define SELINUX_KERNEL_STATUS_VERSION 1 368 struct selinux_kernel_status { 369 u32 version; /* version number of the structure */ 370 u32 sequence; /* sequence number of seqlock logic */ 371 u32 enforcing; /* current setting of enforcing mode */ 372 u32 policyload; /* times of policy reloaded */ 373 u32 deny_unknown; /* current setting of deny_unknown */ 374 /* 375 * The version > 0 supports above members. 376 */ 377 } __packed; 378 379 extern void selinux_status_update_setenforce(bool enforcing); 380 extern void selinux_status_update_policyload(u32 seqno); 381 extern void selinux_complete_init(void); 382 extern struct path selinux_null; 383 extern void selnl_notify_setenforce(int val); 384 extern void selnl_notify_policyload(u32 seqno); 385 extern int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm); 386 387 extern void avtab_cache_init(void); 388 extern void ebitmap_cache_init(void); 389 extern void hashtab_cache_init(void); 390 extern int security_sidtab_hash_stats(char *page); 391 392 #endif /* _SELINUX_SECURITY_H_ */ 393