1 /* SPDX-License-Identifier: GPL-2.0 */
3 * Security server interface.
5 * Author : Stephen Smalley, <sds@tycho.nsa.gov>
9 #ifndef _SELINUX_SECURITY_H_
10 #define _SELINUX_SECURITY_H_
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>
20 #include "policycap.h"
22 #define SECSID_NULL 0x00000000 /* unspecified SID */
23 #define SECSID_WILD 0xffffffff /* wildcard SID */
24 #define SECCLASS_NULL 0x0000 /* no class */
26 /* Identify specific policy version changes */
27 #define POLICYDB_VERSION_BASE 15
28 #define POLICYDB_VERSION_BOOL 16
29 #define POLICYDB_VERSION_IPV6 17
30 #define POLICYDB_VERSION_NLCLASS 18
31 #define POLICYDB_VERSION_VALIDATETRANS 19
32 #define POLICYDB_VERSION_MLS 19
33 #define POLICYDB_VERSION_AVTAB 20
34 #define POLICYDB_VERSION_RANGETRANS 21
35 #define POLICYDB_VERSION_POLCAP 22
36 #define POLICYDB_VERSION_PERMISSIVE 23
37 #define POLICYDB_VERSION_BOUNDARY 24
38 #define POLICYDB_VERSION_FILENAME_TRANS 25
39 #define POLICYDB_VERSION_ROLETRANS 26
40 #define POLICYDB_VERSION_NEW_OBJECT_DEFAULTS 27
41 #define POLICYDB_VERSION_DEFAULT_TYPE 28
42 #define POLICYDB_VERSION_CONSTRAINT_NAMES 29
43 #define POLICYDB_VERSION_XPERMS_IOCTL 30
44 #define POLICYDB_VERSION_INFINIBAND 31
45 #define POLICYDB_VERSION_GLBLUB 32
46 #define POLICYDB_VERSION_COMP_FTRANS 33 /* compressed filename transitions */
48 /* Range of policy versions we understand*/
49 #define POLICYDB_VERSION_MIN POLICYDB_VERSION_BASE
50 #define POLICYDB_VERSION_MAX POLICYDB_VERSION_COMP_FTRANS
52 /* Mask for just the mount related flags */
53 #define SE_MNTMASK 0x0f
54 /* Super block security struct flags for mount options */
55 /* BE CAREFUL, these need to be the low order bits for selinux_get_mnt_opts */
56 #define CONTEXT_MNT 0x01
57 #define FSCONTEXT_MNT 0x02
58 #define ROOTCONTEXT_MNT 0x04
59 #define DEFCONTEXT_MNT 0x08
60 #define SBLABEL_MNT 0x10
61 /* Non-mount related flags */
62 #define SE_SBINITIALIZED 0x0100
63 #define SE_SBPROC 0x0200
64 #define SE_SBGENFS 0x0400
65 #define SE_SBGENFS_XATTR 0x0800
67 #define CONTEXT_STR "context"
68 #define FSCONTEXT_STR "fscontext"
69 #define ROOTCONTEXT_STR "rootcontext"
70 #define DEFCONTEXT_STR "defcontext"
71 #define SECLABEL_STR "seclabel"
73 struct netlbl_lsm_secattr;
75 extern int selinux_enabled_boot;
78 * type_datum properties
79 * available at the kernel policy version >= POLICYDB_VERSION_BOUNDARY
81 #define TYPEDATUM_PROPERTY_PRIMARY 0x0001
82 #define TYPEDATUM_PROPERTY_ATTRIBUTE 0x0002
84 /* limitation of boundary depth */
85 #define POLICYDB_BOUNDS_MAXDEPTH 4
88 struct selinux_policy;
90 struct selinux_state {
91 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
94 #ifdef CONFIG_SECURITY_SELINUX_DEVELOP
99 bool policycap[__POLICYDB_CAP_MAX];
101 struct page *status_page;
102 struct mutex status_lock;
104 struct selinux_avc *avc;
105 struct selinux_policy __rcu *policy;
106 struct mutex policy_mutex;
107 } __randomize_layout;
109 void selinux_avc_init(struct selinux_avc **avc);
111 extern struct selinux_state selinux_state;
113 static inline bool selinux_initialized(const struct selinux_state *state)
115 /* do a synchronized load to avoid race conditions */
116 return smp_load_acquire(&state->initialized);
119 static inline void selinux_mark_initialized(struct selinux_state *state)
121 /* do a synchronized write to avoid race conditions */
122 smp_store_release(&state->initialized, true);
125 #ifdef CONFIG_SECURITY_SELINUX_DEVELOP
126 static inline bool enforcing_enabled(struct selinux_state *state)
128 return READ_ONCE(state->enforcing);
131 static inline void enforcing_set(struct selinux_state *state, bool value)
133 WRITE_ONCE(state->enforcing, value);
136 static inline bool enforcing_enabled(struct selinux_state *state)
141 static inline void enforcing_set(struct selinux_state *state, bool value)
146 static inline bool checkreqprot_get(const struct selinux_state *state)
148 return READ_ONCE(state->checkreqprot);
151 static inline void checkreqprot_set(struct selinux_state *state, bool value)
153 WRITE_ONCE(state->checkreqprot, value);
156 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
157 static inline bool selinux_disabled(struct selinux_state *state)
159 return READ_ONCE(state->disabled);
162 static inline void selinux_mark_disabled(struct selinux_state *state)
164 WRITE_ONCE(state->disabled, true);
167 static inline bool selinux_disabled(struct selinux_state *state)
173 static inline bool selinux_policycap_netpeer(void)
175 struct selinux_state *state = &selinux_state;
177 return READ_ONCE(state->policycap[POLICYDB_CAP_NETPEER]);
180 static inline bool selinux_policycap_openperm(void)
182 struct selinux_state *state = &selinux_state;
184 return READ_ONCE(state->policycap[POLICYDB_CAP_OPENPERM]);
187 static inline bool selinux_policycap_extsockclass(void)
189 struct selinux_state *state = &selinux_state;
191 return READ_ONCE(state->policycap[POLICYDB_CAP_EXTSOCKCLASS]);
194 static inline bool selinux_policycap_alwaysnetwork(void)
196 struct selinux_state *state = &selinux_state;
198 return READ_ONCE(state->policycap[POLICYDB_CAP_ALWAYSNETWORK]);
201 static inline bool selinux_policycap_cgroupseclabel(void)
203 struct selinux_state *state = &selinux_state;
205 return READ_ONCE(state->policycap[POLICYDB_CAP_CGROUPSECLABEL]);
208 static inline bool selinux_policycap_nnp_nosuid_transition(void)
210 struct selinux_state *state = &selinux_state;
212 return READ_ONCE(state->policycap[POLICYDB_CAP_NNP_NOSUID_TRANSITION]);
215 static inline bool selinux_policycap_genfs_seclabel_symlinks(void)
217 struct selinux_state *state = &selinux_state;
219 return READ_ONCE(state->policycap[POLICYDB_CAP_GENFS_SECLABEL_SYMLINKS]);
222 static inline bool selinux_policycap_ioctl_skip_cloexec(void)
224 struct selinux_state *state = &selinux_state;
226 return READ_ONCE(state->policycap[POLICYDB_CAP_IOCTL_SKIP_CLOEXEC]);
229 struct selinux_policy_convert_data;
231 struct selinux_load_state {
232 struct selinux_policy *policy;
233 struct selinux_policy_convert_data *convert_data;
236 int security_mls_enabled(struct selinux_state *state);
237 int security_load_policy(struct selinux_state *state,
238 void *data, size_t len,
239 struct selinux_load_state *load_state);
240 void selinux_policy_commit(struct selinux_state *state,
241 struct selinux_load_state *load_state);
242 void selinux_policy_cancel(struct selinux_state *state,
243 struct selinux_load_state *load_state);
244 int security_read_policy(struct selinux_state *state,
245 void **data, size_t *len);
246 int security_read_state_kernel(struct selinux_state *state,
247 void **data, size_t *len);
248 int security_policycap_supported(struct selinux_state *state,
249 unsigned int req_cap);
251 #define SEL_VEC_MAX 32
260 #define XPERMS_ALLOWED 1
261 #define XPERMS_AUDITALLOW 2
262 #define XPERMS_DONTAUDIT 4
264 #define security_xperm_set(perms, x) ((perms)[(x) >> 5] |= 1 << ((x) & 0x1f))
265 #define security_xperm_test(perms, x) (1 & ((perms)[(x) >> 5] >> ((x) & 0x1f)))
266 struct extended_perms_data {
270 struct extended_perms_decision {
273 struct extended_perms_data *allowed;
274 struct extended_perms_data *auditallow;
275 struct extended_perms_data *dontaudit;
278 struct extended_perms {
279 u16 len; /* length associated decision chain */
280 struct extended_perms_data drivers; /* flag drivers that are used */
283 /* definitions of av_decision.flags */
284 #define AVD_FLAGS_PERMISSIVE 0x0001
286 void security_compute_av(struct selinux_state *state,
288 u16 tclass, struct av_decision *avd,
289 struct extended_perms *xperms);
291 void security_compute_xperms_decision(struct selinux_state *state,
292 u32 ssid, u32 tsid, u16 tclass,
294 struct extended_perms_decision *xpermd);
296 void security_compute_av_user(struct selinux_state *state,
298 u16 tclass, struct av_decision *avd);
300 int security_transition_sid(struct selinux_state *state,
301 u32 ssid, u32 tsid, u16 tclass,
302 const struct qstr *qstr, u32 *out_sid);
304 int security_transition_sid_user(struct selinux_state *state,
305 u32 ssid, u32 tsid, u16 tclass,
306 const char *objname, u32 *out_sid);
308 int security_member_sid(struct selinux_state *state, u32 ssid, u32 tsid,
309 u16 tclass, u32 *out_sid);
311 int security_change_sid(struct selinux_state *state, u32 ssid, u32 tsid,
312 u16 tclass, u32 *out_sid);
314 int security_sid_to_context(struct selinux_state *state, u32 sid,
315 char **scontext, u32 *scontext_len);
317 int security_sid_to_context_force(struct selinux_state *state,
318 u32 sid, char **scontext, u32 *scontext_len);
320 int security_sid_to_context_inval(struct selinux_state *state,
321 u32 sid, char **scontext, u32 *scontext_len);
323 int security_context_to_sid(struct selinux_state *state,
324 const char *scontext, u32 scontext_len,
325 u32 *out_sid, gfp_t gfp);
327 int security_context_str_to_sid(struct selinux_state *state,
328 const char *scontext, u32 *out_sid, gfp_t gfp);
330 int security_context_to_sid_default(struct selinux_state *state,
331 const char *scontext, u32 scontext_len,
332 u32 *out_sid, u32 def_sid, gfp_t gfp_flags);
334 int security_context_to_sid_force(struct selinux_state *state,
335 const char *scontext, u32 scontext_len,
338 int security_get_user_sids(struct selinux_state *state,
339 u32 callsid, char *username,
340 u32 **sids, u32 *nel);
342 int security_port_sid(struct selinux_state *state,
343 u8 protocol, u16 port, u32 *out_sid);
345 int security_ib_pkey_sid(struct selinux_state *state,
346 u64 subnet_prefix, u16 pkey_num, u32 *out_sid);
348 int security_ib_endport_sid(struct selinux_state *state,
349 const char *dev_name, u8 port_num, u32 *out_sid);
351 int security_netif_sid(struct selinux_state *state,
352 char *name, u32 *if_sid);
354 int security_node_sid(struct selinux_state *state,
355 u16 domain, void *addr, u32 addrlen,
358 int security_validate_transition(struct selinux_state *state,
359 u32 oldsid, u32 newsid, u32 tasksid,
362 int security_validate_transition_user(struct selinux_state *state,
363 u32 oldsid, u32 newsid, u32 tasksid,
366 int security_bounded_transition(struct selinux_state *state,
367 u32 oldsid, u32 newsid);
369 int security_sid_mls_copy(struct selinux_state *state,
370 u32 sid, u32 mls_sid, u32 *new_sid);
372 int security_net_peersid_resolve(struct selinux_state *state,
373 u32 nlbl_sid, u32 nlbl_type,
377 int security_get_classes(struct selinux_policy *policy,
378 char ***classes, int *nclasses);
379 int security_get_permissions(struct selinux_policy *policy,
380 char *class, char ***perms, int *nperms);
381 int security_get_reject_unknown(struct selinux_state *state);
382 int security_get_allow_unknown(struct selinux_state *state);
384 #define SECURITY_FS_USE_XATTR 1 /* use xattr */
385 #define SECURITY_FS_USE_TRANS 2 /* use transition SIDs, e.g. devpts/tmpfs */
386 #define SECURITY_FS_USE_TASK 3 /* use task SIDs, e.g. pipefs/sockfs */
387 #define SECURITY_FS_USE_GENFS 4 /* use the genfs support */
388 #define SECURITY_FS_USE_NONE 5 /* no labeling support */
389 #define SECURITY_FS_USE_MNTPOINT 6 /* use mountpoint labeling */
390 #define SECURITY_FS_USE_NATIVE 7 /* use native label support */
391 #define SECURITY_FS_USE_MAX 7 /* Highest SECURITY_FS_USE_XXX */
393 int security_fs_use(struct selinux_state *state, struct super_block *sb);
395 int security_genfs_sid(struct selinux_state *state,
396 const char *fstype, const char *path, u16 sclass,
399 int selinux_policy_genfs_sid(struct selinux_policy *policy,
400 const char *fstype, const char *path, u16 sclass,
403 #ifdef CONFIG_NETLABEL
404 int security_netlbl_secattr_to_sid(struct selinux_state *state,
405 struct netlbl_lsm_secattr *secattr,
408 int security_netlbl_sid_to_secattr(struct selinux_state *state,
410 struct netlbl_lsm_secattr *secattr);
412 static inline int security_netlbl_secattr_to_sid(struct selinux_state *state,
413 struct netlbl_lsm_secattr *secattr,
419 static inline int security_netlbl_sid_to_secattr(struct selinux_state *state,
421 struct netlbl_lsm_secattr *secattr)
425 #endif /* CONFIG_NETLABEL */
427 const char *security_get_initial_sid_context(u32 sid);
430 * status notifier using mmap interface
432 extern struct page *selinux_kernel_status_page(struct selinux_state *state);
434 #define SELINUX_KERNEL_STATUS_VERSION 1
435 struct selinux_kernel_status {
436 u32 version; /* version number of the structure */
437 u32 sequence; /* sequence number of seqlock logic */
438 u32 enforcing; /* current setting of enforcing mode */
439 u32 policyload; /* times of policy reloaded */
440 u32 deny_unknown; /* current setting of deny_unknown */
442 * The version > 0 supports above members.
446 extern void selinux_status_update_setenforce(struct selinux_state *state,
448 extern void selinux_status_update_policyload(struct selinux_state *state,
450 extern void selinux_complete_init(void);
451 extern int selinux_disable(struct selinux_state *state);
452 extern void exit_sel_fs(void);
453 extern struct path selinux_null;
454 extern void selnl_notify_setenforce(int val);
455 extern void selnl_notify_policyload(u32 seqno);
456 extern int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm);
458 extern void avtab_cache_init(void);
459 extern void ebitmap_cache_init(void);
460 extern void hashtab_cache_init(void);
461 extern int security_sidtab_hash_stats(struct selinux_state *state, char *page);
463 #endif /* _SELINUX_SECURITY_H_ */