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 struct selinux_policy_convert_data; 193 194 struct selinux_load_state { 195 struct selinux_policy *policy; 196 struct selinux_policy_convert_data *convert_data; 197 }; 198 199 int security_mls_enabled(void); 200 int security_load_policy(void *data, size_t len, 201 struct selinux_load_state *load_state); 202 void selinux_policy_commit(struct selinux_load_state *load_state); 203 void selinux_policy_cancel(struct selinux_load_state *load_state); 204 int security_read_policy(void **data, size_t *len); 205 int security_read_state_kernel(void **data, size_t *len); 206 int security_policycap_supported(unsigned int req_cap); 207 208 #define SEL_VEC_MAX 32 209 struct av_decision { 210 u32 allowed; 211 u32 auditallow; 212 u32 auditdeny; 213 u32 seqno; 214 u32 flags; 215 }; 216 217 #define XPERMS_ALLOWED 1 218 #define XPERMS_AUDITALLOW 2 219 #define XPERMS_DONTAUDIT 4 220 221 #define security_xperm_set(perms, x) ((perms)[(x) >> 5] |= 1 << ((x) & 0x1f)) 222 #define security_xperm_test(perms, x) (1 & ((perms)[(x) >> 5] >> ((x) & 0x1f))) 223 struct extended_perms_data { 224 u32 p[8]; 225 }; 226 227 struct extended_perms_decision { 228 u8 used; 229 u8 driver; 230 struct extended_perms_data *allowed; 231 struct extended_perms_data *auditallow; 232 struct extended_perms_data *dontaudit; 233 }; 234 235 struct extended_perms { 236 u16 len; /* length associated decision chain */ 237 struct extended_perms_data drivers; /* flag drivers that are used */ 238 }; 239 240 /* definitions of av_decision.flags */ 241 #define AVD_FLAGS_PERMISSIVE 0x0001 242 243 void security_compute_av(u32 ssid, u32 tsid, 244 u16 tclass, struct av_decision *avd, 245 struct extended_perms *xperms); 246 247 void security_compute_xperms_decision(u32 ssid, u32 tsid, u16 tclass, 248 u8 driver, 249 struct extended_perms_decision *xpermd); 250 251 void security_compute_av_user(u32 ssid, u32 tsid, 252 u16 tclass, struct av_decision *avd); 253 254 int security_transition_sid(u32 ssid, u32 tsid, u16 tclass, 255 const struct qstr *qstr, u32 *out_sid); 256 257 int security_transition_sid_user(u32 ssid, u32 tsid, u16 tclass, 258 const char *objname, u32 *out_sid); 259 260 int security_member_sid(u32 ssid, u32 tsid, u16 tclass, u32 *out_sid); 261 262 int security_change_sid(u32 ssid, u32 tsid, u16 tclass, u32 *out_sid); 263 264 int security_sid_to_context(u32 sid, char **scontext, u32 *scontext_len); 265 266 int security_sid_to_context_force(u32 sid, char **scontext, u32 *scontext_len); 267 268 int security_sid_to_context_inval(u32 sid, char **scontext, u32 *scontext_len); 269 270 int security_context_to_sid(const char *scontext, u32 scontext_len, 271 u32 *out_sid, gfp_t gfp); 272 273 int security_context_str_to_sid(const char *scontext, u32 *out_sid, gfp_t gfp); 274 275 int security_context_to_sid_default(const char *scontext, u32 scontext_len, 276 u32 *out_sid, u32 def_sid, gfp_t gfp_flags); 277 278 int security_context_to_sid_force(const char *scontext, u32 scontext_len, 279 u32 *sid); 280 281 int security_get_user_sids(u32 callsid, char *username, u32 **sids, u32 *nel); 282 283 int security_port_sid(u8 protocol, u16 port, u32 *out_sid); 284 285 int security_ib_pkey_sid(u64 subnet_prefix, u16 pkey_num, u32 *out_sid); 286 287 int security_ib_endport_sid(const char *dev_name, u8 port_num, u32 *out_sid); 288 289 int security_netif_sid(char *name, u32 *if_sid); 290 291 int security_node_sid(u16 domain, void *addr, u32 addrlen, 292 u32 *out_sid); 293 294 int security_validate_transition(u32 oldsid, u32 newsid, u32 tasksid, 295 u16 tclass); 296 297 int security_validate_transition_user(u32 oldsid, u32 newsid, u32 tasksid, 298 u16 tclass); 299 300 int security_bounded_transition(u32 oldsid, u32 newsid); 301 302 int security_sid_mls_copy(u32 sid, u32 mls_sid, u32 *new_sid); 303 304 int security_net_peersid_resolve(u32 nlbl_sid, u32 nlbl_type, 305 u32 xfrm_sid, 306 u32 *peer_sid); 307 308 int security_get_classes(struct selinux_policy *policy, 309 char ***classes, u32 *nclasses); 310 int security_get_permissions(struct selinux_policy *policy, 311 const char *class, char ***perms, u32 *nperms); 312 int security_get_reject_unknown(void); 313 int security_get_allow_unknown(void); 314 315 #define SECURITY_FS_USE_XATTR 1 /* use xattr */ 316 #define SECURITY_FS_USE_TRANS 2 /* use transition SIDs, e.g. devpts/tmpfs */ 317 #define SECURITY_FS_USE_TASK 3 /* use task SIDs, e.g. pipefs/sockfs */ 318 #define SECURITY_FS_USE_GENFS 4 /* use the genfs support */ 319 #define SECURITY_FS_USE_NONE 5 /* no labeling support */ 320 #define SECURITY_FS_USE_MNTPOINT 6 /* use mountpoint labeling */ 321 #define SECURITY_FS_USE_NATIVE 7 /* use native label support */ 322 #define SECURITY_FS_USE_MAX 7 /* Highest SECURITY_FS_USE_XXX */ 323 324 int security_fs_use(struct super_block *sb); 325 326 int security_genfs_sid(const char *fstype, const char *path, u16 sclass, 327 u32 *sid); 328 329 int selinux_policy_genfs_sid(struct selinux_policy *policy, 330 const char *fstype, const char *path, u16 sclass, 331 u32 *sid); 332 333 #ifdef CONFIG_NETLABEL 334 int security_netlbl_secattr_to_sid(struct netlbl_lsm_secattr *secattr, 335 u32 *sid); 336 337 int security_netlbl_sid_to_secattr(u32 sid, 338 struct netlbl_lsm_secattr *secattr); 339 #else 340 static inline int security_netlbl_secattr_to_sid(struct netlbl_lsm_secattr *secattr, 341 u32 *sid) 342 { 343 return -EIDRM; 344 } 345 346 static inline int security_netlbl_sid_to_secattr(u32 sid, 347 struct netlbl_lsm_secattr *secattr) 348 { 349 return -ENOENT; 350 } 351 #endif /* CONFIG_NETLABEL */ 352 353 const char *security_get_initial_sid_context(u32 sid); 354 355 /* 356 * status notifier using mmap interface 357 */ 358 extern struct page *selinux_kernel_status_page(void); 359 360 #define SELINUX_KERNEL_STATUS_VERSION 1 361 struct selinux_kernel_status { 362 u32 version; /* version number of the structure */ 363 u32 sequence; /* sequence number of seqlock logic */ 364 u32 enforcing; /* current setting of enforcing mode */ 365 u32 policyload; /* times of policy reloaded */ 366 u32 deny_unknown; /* current setting of deny_unknown */ 367 /* 368 * The version > 0 supports above members. 369 */ 370 } __packed; 371 372 extern void selinux_status_update_setenforce(bool enforcing); 373 extern void selinux_status_update_policyload(u32 seqno); 374 extern void selinux_complete_init(void); 375 extern struct path selinux_null; 376 extern void selnl_notify_setenforce(int val); 377 extern void selnl_notify_policyload(u32 seqno); 378 extern int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm); 379 380 extern void avtab_cache_init(void); 381 extern void ebitmap_cache_init(void); 382 extern void hashtab_cache_init(void); 383 extern int security_sidtab_hash_stats(char *page); 384 385 #endif /* _SELINUX_SECURITY_H_ */ 386