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