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