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/refcount.h> 17 #include <linux/workqueue.h> 18 #include "flask.h" 19 20 #define SECSID_NULL 0x00000000 /* unspecified SID */ 21 #define SECSID_WILD 0xffffffff /* wildcard SID */ 22 #define SECCLASS_NULL 0x0000 /* no class */ 23 24 /* Identify specific policy version changes */ 25 #define POLICYDB_VERSION_BASE 15 26 #define POLICYDB_VERSION_BOOL 16 27 #define POLICYDB_VERSION_IPV6 17 28 #define POLICYDB_VERSION_NLCLASS 18 29 #define POLICYDB_VERSION_VALIDATETRANS 19 30 #define POLICYDB_VERSION_MLS 19 31 #define POLICYDB_VERSION_AVTAB 20 32 #define POLICYDB_VERSION_RANGETRANS 21 33 #define POLICYDB_VERSION_POLCAP 22 34 #define POLICYDB_VERSION_PERMISSIVE 23 35 #define POLICYDB_VERSION_BOUNDARY 24 36 #define POLICYDB_VERSION_FILENAME_TRANS 25 37 #define POLICYDB_VERSION_ROLETRANS 26 38 #define POLICYDB_VERSION_NEW_OBJECT_DEFAULTS 27 39 #define POLICYDB_VERSION_DEFAULT_TYPE 28 40 #define POLICYDB_VERSION_CONSTRAINT_NAMES 29 41 #define POLICYDB_VERSION_XPERMS_IOCTL 30 42 #define POLICYDB_VERSION_INFINIBAND 31 43 44 /* Range of policy versions we understand*/ 45 #define POLICYDB_VERSION_MIN POLICYDB_VERSION_BASE 46 #define POLICYDB_VERSION_MAX POLICYDB_VERSION_INFINIBAND 47 48 /* Mask for just the mount related flags */ 49 #define SE_MNTMASK 0x0f 50 /* Super block security struct flags for mount options */ 51 /* BE CAREFUL, these need to be the low order bits for selinux_get_mnt_opts */ 52 #define CONTEXT_MNT 0x01 53 #define FSCONTEXT_MNT 0x02 54 #define ROOTCONTEXT_MNT 0x04 55 #define DEFCONTEXT_MNT 0x08 56 #define SBLABEL_MNT 0x10 57 /* Non-mount related flags */ 58 #define SE_SBINITIALIZED 0x0100 59 #define SE_SBPROC 0x0200 60 #define SE_SBGENFS 0x0400 61 #define SE_SBGENFS_XATTR 0x0800 62 63 #define CONTEXT_STR "context" 64 #define FSCONTEXT_STR "fscontext" 65 #define ROOTCONTEXT_STR "rootcontext" 66 #define DEFCONTEXT_STR "defcontext" 67 #define SECLABEL_STR "seclabel" 68 69 struct netlbl_lsm_secattr; 70 71 extern int selinux_enabled; 72 73 /* Policy capabilities */ 74 enum { 75 POLICYDB_CAPABILITY_NETPEER, 76 POLICYDB_CAPABILITY_OPENPERM, 77 POLICYDB_CAPABILITY_EXTSOCKCLASS, 78 POLICYDB_CAPABILITY_ALWAYSNETWORK, 79 POLICYDB_CAPABILITY_CGROUPSECLABEL, 80 POLICYDB_CAPABILITY_NNP_NOSUID_TRANSITION, 81 __POLICYDB_CAPABILITY_MAX 82 }; 83 #define POLICYDB_CAPABILITY_MAX (__POLICYDB_CAPABILITY_MAX - 1) 84 85 extern const char *selinux_policycap_names[__POLICYDB_CAPABILITY_MAX]; 86 87 /* 88 * type_datum properties 89 * available at the kernel policy version >= POLICYDB_VERSION_BOUNDARY 90 */ 91 #define TYPEDATUM_PROPERTY_PRIMARY 0x0001 92 #define TYPEDATUM_PROPERTY_ATTRIBUTE 0x0002 93 94 /* limitation of boundary depth */ 95 #define POLICYDB_BOUNDS_MAXDEPTH 4 96 97 struct selinux_avc; 98 struct selinux_ss; 99 100 struct selinux_state { 101 bool disabled; 102 #ifdef CONFIG_SECURITY_SELINUX_DEVELOP 103 bool enforcing; 104 #endif 105 bool checkreqprot; 106 bool initialized; 107 bool policycap[__POLICYDB_CAPABILITY_MAX]; 108 struct selinux_avc *avc; 109 struct selinux_ss *ss; 110 }; 111 112 void selinux_ss_init(struct selinux_ss **ss); 113 void selinux_avc_init(struct selinux_avc **avc); 114 115 extern struct selinux_state selinux_state; 116 117 #ifdef CONFIG_SECURITY_SELINUX_DEVELOP 118 static inline bool enforcing_enabled(struct selinux_state *state) 119 { 120 return state->enforcing; 121 } 122 123 static inline void enforcing_set(struct selinux_state *state, bool value) 124 { 125 state->enforcing = value; 126 } 127 #else 128 static inline bool enforcing_enabled(struct selinux_state *state) 129 { 130 return true; 131 } 132 133 static inline void enforcing_set(struct selinux_state *state, bool value) 134 { 135 } 136 #endif 137 138 static inline bool selinux_policycap_netpeer(void) 139 { 140 struct selinux_state *state = &selinux_state; 141 142 return state->policycap[POLICYDB_CAPABILITY_NETPEER]; 143 } 144 145 static inline bool selinux_policycap_openperm(void) 146 { 147 struct selinux_state *state = &selinux_state; 148 149 return state->policycap[POLICYDB_CAPABILITY_OPENPERM]; 150 } 151 152 static inline bool selinux_policycap_extsockclass(void) 153 { 154 struct selinux_state *state = &selinux_state; 155 156 return state->policycap[POLICYDB_CAPABILITY_EXTSOCKCLASS]; 157 } 158 159 static inline bool selinux_policycap_alwaysnetwork(void) 160 { 161 struct selinux_state *state = &selinux_state; 162 163 return state->policycap[POLICYDB_CAPABILITY_ALWAYSNETWORK]; 164 } 165 166 static inline bool selinux_policycap_cgroupseclabel(void) 167 { 168 struct selinux_state *state = &selinux_state; 169 170 return state->policycap[POLICYDB_CAPABILITY_CGROUPSECLABEL]; 171 } 172 173 static inline bool selinux_policycap_nnp_nosuid_transition(void) 174 { 175 struct selinux_state *state = &selinux_state; 176 177 return state->policycap[POLICYDB_CAPABILITY_NNP_NOSUID_TRANSITION]; 178 } 179 180 int security_mls_enabled(struct selinux_state *state); 181 int security_load_policy(struct selinux_state *state, 182 void *data, size_t len); 183 int security_read_policy(struct selinux_state *state, 184 void **data, size_t *len); 185 size_t security_policydb_len(struct selinux_state *state); 186 187 int security_policycap_supported(struct selinux_state *state, 188 unsigned int req_cap); 189 190 #define SEL_VEC_MAX 32 191 struct av_decision { 192 u32 allowed; 193 u32 auditallow; 194 u32 auditdeny; 195 u32 seqno; 196 u32 flags; 197 }; 198 199 #define XPERMS_ALLOWED 1 200 #define XPERMS_AUDITALLOW 2 201 #define XPERMS_DONTAUDIT 4 202 203 #define security_xperm_set(perms, x) (perms[x >> 5] |= 1 << (x & 0x1f)) 204 #define security_xperm_test(perms, x) (1 & (perms[x >> 5] >> (x & 0x1f))) 205 struct extended_perms_data { 206 u32 p[8]; 207 }; 208 209 struct extended_perms_decision { 210 u8 used; 211 u8 driver; 212 struct extended_perms_data *allowed; 213 struct extended_perms_data *auditallow; 214 struct extended_perms_data *dontaudit; 215 }; 216 217 struct extended_perms { 218 u16 len; /* length associated decision chain */ 219 struct extended_perms_data drivers; /* flag drivers that are used */ 220 }; 221 222 /* definitions of av_decision.flags */ 223 #define AVD_FLAGS_PERMISSIVE 0x0001 224 225 void security_compute_av(struct selinux_state *state, 226 u32 ssid, u32 tsid, 227 u16 tclass, struct av_decision *avd, 228 struct extended_perms *xperms); 229 230 void security_compute_xperms_decision(struct selinux_state *state, 231 u32 ssid, u32 tsid, u16 tclass, 232 u8 driver, 233 struct extended_perms_decision *xpermd); 234 235 void security_compute_av_user(struct selinux_state *state, 236 u32 ssid, u32 tsid, 237 u16 tclass, struct av_decision *avd); 238 239 int security_transition_sid(struct selinux_state *state, 240 u32 ssid, u32 tsid, u16 tclass, 241 const struct qstr *qstr, u32 *out_sid); 242 243 int security_transition_sid_user(struct selinux_state *state, 244 u32 ssid, u32 tsid, u16 tclass, 245 const char *objname, u32 *out_sid); 246 247 int security_member_sid(struct selinux_state *state, u32 ssid, u32 tsid, 248 u16 tclass, u32 *out_sid); 249 250 int security_change_sid(struct selinux_state *state, u32 ssid, u32 tsid, 251 u16 tclass, u32 *out_sid); 252 253 int security_sid_to_context(struct selinux_state *state, u32 sid, 254 char **scontext, u32 *scontext_len); 255 256 int security_sid_to_context_force(struct selinux_state *state, 257 u32 sid, char **scontext, u32 *scontext_len); 258 259 int security_sid_to_context_inval(struct selinux_state *state, 260 u32 sid, char **scontext, u32 *scontext_len); 261 262 int security_context_to_sid(struct selinux_state *state, 263 const char *scontext, u32 scontext_len, 264 u32 *out_sid, gfp_t gfp); 265 266 int security_context_str_to_sid(struct selinux_state *state, 267 const char *scontext, u32 *out_sid, gfp_t gfp); 268 269 int security_context_to_sid_default(struct selinux_state *state, 270 const char *scontext, u32 scontext_len, 271 u32 *out_sid, u32 def_sid, gfp_t gfp_flags); 272 273 int security_context_to_sid_force(struct selinux_state *state, 274 const char *scontext, u32 scontext_len, 275 u32 *sid); 276 277 int security_get_user_sids(struct selinux_state *state, 278 u32 callsid, char *username, 279 u32 **sids, u32 *nel); 280 281 int security_port_sid(struct selinux_state *state, 282 u8 protocol, u16 port, u32 *out_sid); 283 284 int security_ib_pkey_sid(struct selinux_state *state, 285 u64 subnet_prefix, u16 pkey_num, u32 *out_sid); 286 287 int security_ib_endport_sid(struct selinux_state *state, 288 const char *dev_name, u8 port_num, u32 *out_sid); 289 290 int security_netif_sid(struct selinux_state *state, 291 char *name, u32 *if_sid); 292 293 int security_node_sid(struct selinux_state *state, 294 u16 domain, void *addr, u32 addrlen, 295 u32 *out_sid); 296 297 int security_validate_transition(struct selinux_state *state, 298 u32 oldsid, u32 newsid, u32 tasksid, 299 u16 tclass); 300 301 int security_validate_transition_user(struct selinux_state *state, 302 u32 oldsid, u32 newsid, u32 tasksid, 303 u16 tclass); 304 305 int security_bounded_transition(struct selinux_state *state, 306 u32 oldsid, u32 newsid); 307 308 int security_sid_mls_copy(struct selinux_state *state, 309 u32 sid, u32 mls_sid, u32 *new_sid); 310 311 int security_net_peersid_resolve(struct selinux_state *state, 312 u32 nlbl_sid, u32 nlbl_type, 313 u32 xfrm_sid, 314 u32 *peer_sid); 315 316 int security_get_classes(struct selinux_state *state, 317 char ***classes, int *nclasses); 318 int security_get_permissions(struct selinux_state *state, 319 char *class, char ***perms, int *nperms); 320 int security_get_reject_unknown(struct selinux_state *state); 321 int security_get_allow_unknown(struct selinux_state *state); 322 323 #define SECURITY_FS_USE_XATTR 1 /* use xattr */ 324 #define SECURITY_FS_USE_TRANS 2 /* use transition SIDs, e.g. devpts/tmpfs */ 325 #define SECURITY_FS_USE_TASK 3 /* use task SIDs, e.g. pipefs/sockfs */ 326 #define SECURITY_FS_USE_GENFS 4 /* use the genfs support */ 327 #define SECURITY_FS_USE_NONE 5 /* no labeling support */ 328 #define SECURITY_FS_USE_MNTPOINT 6 /* use mountpoint labeling */ 329 #define SECURITY_FS_USE_NATIVE 7 /* use native label support */ 330 #define SECURITY_FS_USE_MAX 7 /* Highest SECURITY_FS_USE_XXX */ 331 332 int security_fs_use(struct selinux_state *state, struct super_block *sb); 333 334 int security_genfs_sid(struct selinux_state *state, 335 const char *fstype, char *name, u16 sclass, 336 u32 *sid); 337 338 #ifdef CONFIG_NETLABEL 339 int security_netlbl_secattr_to_sid(struct selinux_state *state, 340 struct netlbl_lsm_secattr *secattr, 341 u32 *sid); 342 343 int security_netlbl_sid_to_secattr(struct selinux_state *state, 344 u32 sid, 345 struct netlbl_lsm_secattr *secattr); 346 #else 347 static inline int security_netlbl_secattr_to_sid(struct selinux_state *state, 348 struct netlbl_lsm_secattr *secattr, 349 u32 *sid) 350 { 351 return -EIDRM; 352 } 353 354 static inline int security_netlbl_sid_to_secattr(struct selinux_state *state, 355 u32 sid, 356 struct netlbl_lsm_secattr *secattr) 357 { 358 return -ENOENT; 359 } 360 #endif /* CONFIG_NETLABEL */ 361 362 const char *security_get_initial_sid_context(u32 sid); 363 364 /* 365 * status notifier using mmap interface 366 */ 367 extern struct page *selinux_kernel_status_page(struct selinux_state *state); 368 369 #define SELINUX_KERNEL_STATUS_VERSION 1 370 struct selinux_kernel_status { 371 u32 version; /* version number of thie structure */ 372 u32 sequence; /* sequence number of seqlock logic */ 373 u32 enforcing; /* current setting of enforcing mode */ 374 u32 policyload; /* times of policy reloaded */ 375 u32 deny_unknown; /* current setting of deny_unknown */ 376 /* 377 * The version > 0 supports above members. 378 */ 379 } __packed; 380 381 extern void selinux_status_update_setenforce(struct selinux_state *state, 382 int enforcing); 383 extern void selinux_status_update_policyload(struct selinux_state *state, 384 int seqno); 385 extern void selinux_complete_init(void); 386 extern int selinux_disable(struct selinux_state *state); 387 extern void exit_sel_fs(void); 388 extern struct path selinux_null; 389 extern struct vfsmount *selinuxfs_mount; 390 extern void selnl_notify_setenforce(int val); 391 extern void selnl_notify_policyload(u32 seqno); 392 extern int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm); 393 394 extern void avtab_cache_init(void); 395 extern void ebitmap_cache_init(void); 396 extern void hashtab_cache_init(void); 397 398 #endif /* _SELINUX_SECURITY_H_ */ 399