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 #define POLICYDB_VERSION_GLBLUB 32 44 45 /* Range of policy versions we understand*/ 46 #define POLICYDB_VERSION_MIN POLICYDB_VERSION_BASE 47 #define POLICYDB_VERSION_MAX POLICYDB_VERSION_GLBLUB 48 49 /* Mask for just the mount related flags */ 50 #define SE_MNTMASK 0x0f 51 /* Super block security struct flags for mount options */ 52 /* BE CAREFUL, these need to be the low order bits for selinux_get_mnt_opts */ 53 #define CONTEXT_MNT 0x01 54 #define FSCONTEXT_MNT 0x02 55 #define ROOTCONTEXT_MNT 0x04 56 #define DEFCONTEXT_MNT 0x08 57 #define SBLABEL_MNT 0x10 58 /* Non-mount related flags */ 59 #define SE_SBINITIALIZED 0x0100 60 #define SE_SBPROC 0x0200 61 #define SE_SBGENFS 0x0400 62 #define SE_SBGENFS_XATTR 0x0800 63 64 #define CONTEXT_STR "context" 65 #define FSCONTEXT_STR "fscontext" 66 #define ROOTCONTEXT_STR "rootcontext" 67 #define DEFCONTEXT_STR "defcontext" 68 #define SECLABEL_STR "seclabel" 69 70 struct netlbl_lsm_secattr; 71 72 extern int selinux_enabled; 73 74 /* Policy capabilities */ 75 enum { 76 POLICYDB_CAPABILITY_NETPEER, 77 POLICYDB_CAPABILITY_OPENPERM, 78 POLICYDB_CAPABILITY_EXTSOCKCLASS, 79 POLICYDB_CAPABILITY_ALWAYSNETWORK, 80 POLICYDB_CAPABILITY_CGROUPSECLABEL, 81 POLICYDB_CAPABILITY_NNP_NOSUID_TRANSITION, 82 __POLICYDB_CAPABILITY_MAX 83 }; 84 #define POLICYDB_CAPABILITY_MAX (__POLICYDB_CAPABILITY_MAX - 1) 85 86 extern const char *selinux_policycap_names[__POLICYDB_CAPABILITY_MAX]; 87 88 /* 89 * type_datum properties 90 * available at the kernel policy version >= POLICYDB_VERSION_BOUNDARY 91 */ 92 #define TYPEDATUM_PROPERTY_PRIMARY 0x0001 93 #define TYPEDATUM_PROPERTY_ATTRIBUTE 0x0002 94 95 /* limitation of boundary depth */ 96 #define POLICYDB_BOUNDS_MAXDEPTH 4 97 98 struct selinux_avc; 99 struct selinux_ss; 100 101 struct selinux_state { 102 bool disabled; 103 #ifdef CONFIG_SECURITY_SELINUX_DEVELOP 104 bool enforcing; 105 #endif 106 bool checkreqprot; 107 bool initialized; 108 bool policycap[__POLICYDB_CAPABILITY_MAX]; 109 struct selinux_avc *avc; 110 struct selinux_ss *ss; 111 }; 112 113 void selinux_ss_init(struct selinux_ss **ss); 114 void selinux_avc_init(struct selinux_avc **avc); 115 116 extern struct selinux_state selinux_state; 117 118 #ifdef CONFIG_SECURITY_SELINUX_DEVELOP 119 static inline bool enforcing_enabled(struct selinux_state *state) 120 { 121 return state->enforcing; 122 } 123 124 static inline void enforcing_set(struct selinux_state *state, bool value) 125 { 126 state->enforcing = value; 127 } 128 #else 129 static inline bool enforcing_enabled(struct selinux_state *state) 130 { 131 return true; 132 } 133 134 static inline void enforcing_set(struct selinux_state *state, bool value) 135 { 136 } 137 #endif 138 139 static inline bool selinux_policycap_netpeer(void) 140 { 141 struct selinux_state *state = &selinux_state; 142 143 return state->policycap[POLICYDB_CAPABILITY_NETPEER]; 144 } 145 146 static inline bool selinux_policycap_openperm(void) 147 { 148 struct selinux_state *state = &selinux_state; 149 150 return state->policycap[POLICYDB_CAPABILITY_OPENPERM]; 151 } 152 153 static inline bool selinux_policycap_extsockclass(void) 154 { 155 struct selinux_state *state = &selinux_state; 156 157 return state->policycap[POLICYDB_CAPABILITY_EXTSOCKCLASS]; 158 } 159 160 static inline bool selinux_policycap_alwaysnetwork(void) 161 { 162 struct selinux_state *state = &selinux_state; 163 164 return state->policycap[POLICYDB_CAPABILITY_ALWAYSNETWORK]; 165 } 166 167 static inline bool selinux_policycap_cgroupseclabel(void) 168 { 169 struct selinux_state *state = &selinux_state; 170 171 return state->policycap[POLICYDB_CAPABILITY_CGROUPSECLABEL]; 172 } 173 174 static inline bool selinux_policycap_nnp_nosuid_transition(void) 175 { 176 struct selinux_state *state = &selinux_state; 177 178 return state->policycap[POLICYDB_CAPABILITY_NNP_NOSUID_TRANSITION]; 179 } 180 181 int security_mls_enabled(struct selinux_state *state); 182 int security_load_policy(struct selinux_state *state, 183 void *data, size_t len); 184 int security_read_policy(struct selinux_state *state, 185 void **data, size_t *len); 186 size_t security_policydb_len(struct selinux_state *state); 187 188 int security_policycap_supported(struct selinux_state *state, 189 unsigned int req_cap); 190 191 #define SEL_VEC_MAX 32 192 struct av_decision { 193 u32 allowed; 194 u32 auditallow; 195 u32 auditdeny; 196 u32 seqno; 197 u32 flags; 198 }; 199 200 #define XPERMS_ALLOWED 1 201 #define XPERMS_AUDITALLOW 2 202 #define XPERMS_DONTAUDIT 4 203 204 #define security_xperm_set(perms, x) (perms[x >> 5] |= 1 << (x & 0x1f)) 205 #define security_xperm_test(perms, x) (1 & (perms[x >> 5] >> (x & 0x1f))) 206 struct extended_perms_data { 207 u32 p[8]; 208 }; 209 210 struct extended_perms_decision { 211 u8 used; 212 u8 driver; 213 struct extended_perms_data *allowed; 214 struct extended_perms_data *auditallow; 215 struct extended_perms_data *dontaudit; 216 }; 217 218 struct extended_perms { 219 u16 len; /* length associated decision chain */ 220 struct extended_perms_data drivers; /* flag drivers that are used */ 221 }; 222 223 /* definitions of av_decision.flags */ 224 #define AVD_FLAGS_PERMISSIVE 0x0001 225 226 void security_compute_av(struct selinux_state *state, 227 u32 ssid, u32 tsid, 228 u16 tclass, struct av_decision *avd, 229 struct extended_perms *xperms); 230 231 void security_compute_xperms_decision(struct selinux_state *state, 232 u32 ssid, u32 tsid, u16 tclass, 233 u8 driver, 234 struct extended_perms_decision *xpermd); 235 236 void security_compute_av_user(struct selinux_state *state, 237 u32 ssid, u32 tsid, 238 u16 tclass, struct av_decision *avd); 239 240 int security_transition_sid(struct selinux_state *state, 241 u32 ssid, u32 tsid, u16 tclass, 242 const struct qstr *qstr, u32 *out_sid); 243 244 int security_transition_sid_user(struct selinux_state *state, 245 u32 ssid, u32 tsid, u16 tclass, 246 const char *objname, u32 *out_sid); 247 248 int security_member_sid(struct selinux_state *state, u32 ssid, u32 tsid, 249 u16 tclass, u32 *out_sid); 250 251 int security_change_sid(struct selinux_state *state, u32 ssid, u32 tsid, 252 u16 tclass, u32 *out_sid); 253 254 int security_sid_to_context(struct selinux_state *state, u32 sid, 255 char **scontext, u32 *scontext_len); 256 257 int security_sid_to_context_force(struct selinux_state *state, 258 u32 sid, char **scontext, u32 *scontext_len); 259 260 int security_sid_to_context_inval(struct selinux_state *state, 261 u32 sid, char **scontext, u32 *scontext_len); 262 263 int security_context_to_sid(struct selinux_state *state, 264 const char *scontext, u32 scontext_len, 265 u32 *out_sid, gfp_t gfp); 266 267 int security_context_str_to_sid(struct selinux_state *state, 268 const char *scontext, u32 *out_sid, gfp_t gfp); 269 270 int security_context_to_sid_default(struct selinux_state *state, 271 const char *scontext, u32 scontext_len, 272 u32 *out_sid, u32 def_sid, gfp_t gfp_flags); 273 274 int security_context_to_sid_force(struct selinux_state *state, 275 const char *scontext, u32 scontext_len, 276 u32 *sid); 277 278 int security_get_user_sids(struct selinux_state *state, 279 u32 callsid, char *username, 280 u32 **sids, u32 *nel); 281 282 int security_port_sid(struct selinux_state *state, 283 u8 protocol, u16 port, u32 *out_sid); 284 285 int security_ib_pkey_sid(struct selinux_state *state, 286 u64 subnet_prefix, u16 pkey_num, u32 *out_sid); 287 288 int security_ib_endport_sid(struct selinux_state *state, 289 const char *dev_name, u8 port_num, u32 *out_sid); 290 291 int security_netif_sid(struct selinux_state *state, 292 char *name, u32 *if_sid); 293 294 int security_node_sid(struct selinux_state *state, 295 u16 domain, void *addr, u32 addrlen, 296 u32 *out_sid); 297 298 int security_validate_transition(struct selinux_state *state, 299 u32 oldsid, u32 newsid, u32 tasksid, 300 u16 tclass); 301 302 int security_validate_transition_user(struct selinux_state *state, 303 u32 oldsid, u32 newsid, u32 tasksid, 304 u16 tclass); 305 306 int security_bounded_transition(struct selinux_state *state, 307 u32 oldsid, u32 newsid); 308 309 int security_sid_mls_copy(struct selinux_state *state, 310 u32 sid, u32 mls_sid, u32 *new_sid); 311 312 int security_net_peersid_resolve(struct selinux_state *state, 313 u32 nlbl_sid, u32 nlbl_type, 314 u32 xfrm_sid, 315 u32 *peer_sid); 316 317 int security_get_classes(struct selinux_state *state, 318 char ***classes, int *nclasses); 319 int security_get_permissions(struct selinux_state *state, 320 char *class, char ***perms, int *nperms); 321 int security_get_reject_unknown(struct selinux_state *state); 322 int security_get_allow_unknown(struct selinux_state *state); 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 selinux_state *state, struct super_block *sb); 334 335 int security_genfs_sid(struct selinux_state *state, 336 const char *fstype, char *name, u16 sclass, 337 u32 *sid); 338 339 #ifdef CONFIG_NETLABEL 340 int security_netlbl_secattr_to_sid(struct selinux_state *state, 341 struct netlbl_lsm_secattr *secattr, 342 u32 *sid); 343 344 int security_netlbl_sid_to_secattr(struct selinux_state *state, 345 u32 sid, 346 struct netlbl_lsm_secattr *secattr); 347 #else 348 static inline int security_netlbl_secattr_to_sid(struct selinux_state *state, 349 struct netlbl_lsm_secattr *secattr, 350 u32 *sid) 351 { 352 return -EIDRM; 353 } 354 355 static inline int security_netlbl_sid_to_secattr(struct selinux_state *state, 356 u32 sid, 357 struct netlbl_lsm_secattr *secattr) 358 { 359 return -ENOENT; 360 } 361 #endif /* CONFIG_NETLABEL */ 362 363 const char *security_get_initial_sid_context(u32 sid); 364 365 /* 366 * status notifier using mmap interface 367 */ 368 extern struct page *selinux_kernel_status_page(struct selinux_state *state); 369 370 #define SELINUX_KERNEL_STATUS_VERSION 1 371 struct selinux_kernel_status { 372 u32 version; /* version number of thie structure */ 373 u32 sequence; /* sequence number of seqlock logic */ 374 u32 enforcing; /* current setting of enforcing mode */ 375 u32 policyload; /* times of policy reloaded */ 376 u32 deny_unknown; /* current setting of deny_unknown */ 377 /* 378 * The version > 0 supports above members. 379 */ 380 } __packed; 381 382 extern void selinux_status_update_setenforce(struct selinux_state *state, 383 int enforcing); 384 extern void selinux_status_update_policyload(struct selinux_state *state, 385 int seqno); 386 extern void selinux_complete_init(void); 387 extern int selinux_disable(struct selinux_state *state); 388 extern void exit_sel_fs(void); 389 extern struct path selinux_null; 390 extern struct vfsmount *selinuxfs_mount; 391 extern void selnl_notify_setenforce(int val); 392 extern void selnl_notify_policyload(u32 seqno); 393 extern int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm); 394 395 extern void avtab_cache_init(void); 396 extern void ebitmap_cache_init(void); 397 extern void hashtab_cache_init(void); 398 399 #endif /* _SELINUX_SECURITY_H_ */ 400