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/refcount.h>
17 #include <linux/workqueue.h>
20 #define SECSID_NULL 0x00000000 /* unspecified SID */
21 #define SECSID_WILD 0xffffffff /* wildcard SID */
22 #define SECCLASS_NULL 0x0000 /* no class */
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
45 /* Range of policy versions we understand*/
46 #define POLICYDB_VERSION_MIN POLICYDB_VERSION_BASE
47 #define POLICYDB_VERSION_MAX POLICYDB_VERSION_GLBLUB
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
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"
70 struct netlbl_lsm_secattr;
72 extern int selinux_enabled_boot;
74 /* Policy capabilities */
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
84 #define POLICYDB_CAPABILITY_MAX (__POLICYDB_CAPABILITY_MAX - 1)
86 extern const char *selinux_policycap_names[__POLICYDB_CAPABILITY_MAX];
89 * type_datum properties
90 * available at the kernel policy version >= POLICYDB_VERSION_BOUNDARY
92 #define TYPEDATUM_PROPERTY_PRIMARY 0x0001
93 #define TYPEDATUM_PROPERTY_ATTRIBUTE 0x0002
95 /* limitation of boundary depth */
96 #define POLICYDB_BOUNDS_MAXDEPTH 4
101 struct selinux_state {
102 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
105 #ifdef CONFIG_SECURITY_SELINUX_DEVELOP
110 bool policycap[__POLICYDB_CAPABILITY_MAX];
111 struct selinux_avc *avc;
112 struct selinux_ss *ss;
113 } __randomize_layout;
115 void selinux_ss_init(struct selinux_ss **ss);
116 void selinux_avc_init(struct selinux_avc **avc);
118 extern struct selinux_state selinux_state;
120 static inline bool selinux_initialized(const struct selinux_state *state)
122 /* do a synchronized load to avoid race conditions */
123 return smp_load_acquire(&state->initialized);
126 static inline void selinux_mark_initialized(struct selinux_state *state)
128 /* do a synchronized write to avoid race conditions */
129 smp_store_release(&state->initialized, true);
132 #ifdef CONFIG_SECURITY_SELINUX_DEVELOP
133 static inline bool enforcing_enabled(struct selinux_state *state)
135 return READ_ONCE(state->enforcing);
138 static inline void enforcing_set(struct selinux_state *state, bool value)
140 WRITE_ONCE(state->enforcing, value);
143 static inline bool enforcing_enabled(struct selinux_state *state)
148 static inline void enforcing_set(struct selinux_state *state, bool value)
153 #ifdef CONFIG_SECURITY_SELINUX_DISABLE
154 static inline bool selinux_disabled(struct selinux_state *state)
156 return READ_ONCE(state->disabled);
159 static inline void selinux_mark_disabled(struct selinux_state *state)
161 WRITE_ONCE(state->disabled, true);
164 static inline bool selinux_disabled(struct selinux_state *state)
170 static inline bool selinux_policycap_netpeer(void)
172 struct selinux_state *state = &selinux_state;
174 return state->policycap[POLICYDB_CAPABILITY_NETPEER];
177 static inline bool selinux_policycap_openperm(void)
179 struct selinux_state *state = &selinux_state;
181 return state->policycap[POLICYDB_CAPABILITY_OPENPERM];
184 static inline bool selinux_policycap_extsockclass(void)
186 struct selinux_state *state = &selinux_state;
188 return state->policycap[POLICYDB_CAPABILITY_EXTSOCKCLASS];
191 static inline bool selinux_policycap_alwaysnetwork(void)
193 struct selinux_state *state = &selinux_state;
195 return state->policycap[POLICYDB_CAPABILITY_ALWAYSNETWORK];
198 static inline bool selinux_policycap_cgroupseclabel(void)
200 struct selinux_state *state = &selinux_state;
202 return state->policycap[POLICYDB_CAPABILITY_CGROUPSECLABEL];
205 static inline bool selinux_policycap_nnp_nosuid_transition(void)
207 struct selinux_state *state = &selinux_state;
209 return state->policycap[POLICYDB_CAPABILITY_NNP_NOSUID_TRANSITION];
212 int security_mls_enabled(struct selinux_state *state);
213 int security_load_policy(struct selinux_state *state,
214 void *data, size_t len);
215 int security_read_policy(struct selinux_state *state,
216 void **data, size_t *len);
217 size_t security_policydb_len(struct selinux_state *state);
219 int security_policycap_supported(struct selinux_state *state,
220 unsigned int req_cap);
222 #define SEL_VEC_MAX 32
231 #define XPERMS_ALLOWED 1
232 #define XPERMS_AUDITALLOW 2
233 #define XPERMS_DONTAUDIT 4
235 #define security_xperm_set(perms, x) (perms[x >> 5] |= 1 << (x & 0x1f))
236 #define security_xperm_test(perms, x) (1 & (perms[x >> 5] >> (x & 0x1f)))
237 struct extended_perms_data {
241 struct extended_perms_decision {
244 struct extended_perms_data *allowed;
245 struct extended_perms_data *auditallow;
246 struct extended_perms_data *dontaudit;
249 struct extended_perms {
250 u16 len; /* length associated decision chain */
251 struct extended_perms_data drivers; /* flag drivers that are used */
254 /* definitions of av_decision.flags */
255 #define AVD_FLAGS_PERMISSIVE 0x0001
257 void security_compute_av(struct selinux_state *state,
259 u16 tclass, struct av_decision *avd,
260 struct extended_perms *xperms);
262 void security_compute_xperms_decision(struct selinux_state *state,
263 u32 ssid, u32 tsid, u16 tclass,
265 struct extended_perms_decision *xpermd);
267 void security_compute_av_user(struct selinux_state *state,
269 u16 tclass, struct av_decision *avd);
271 int security_transition_sid(struct selinux_state *state,
272 u32 ssid, u32 tsid, u16 tclass,
273 const struct qstr *qstr, u32 *out_sid);
275 int security_transition_sid_user(struct selinux_state *state,
276 u32 ssid, u32 tsid, u16 tclass,
277 const char *objname, u32 *out_sid);
279 int security_member_sid(struct selinux_state *state, u32 ssid, u32 tsid,
280 u16 tclass, u32 *out_sid);
282 int security_change_sid(struct selinux_state *state, u32 ssid, u32 tsid,
283 u16 tclass, u32 *out_sid);
285 int security_sid_to_context(struct selinux_state *state, u32 sid,
286 char **scontext, u32 *scontext_len);
288 int security_sid_to_context_force(struct selinux_state *state,
289 u32 sid, char **scontext, u32 *scontext_len);
291 int security_sid_to_context_inval(struct selinux_state *state,
292 u32 sid, char **scontext, u32 *scontext_len);
294 int security_context_to_sid(struct selinux_state *state,
295 const char *scontext, u32 scontext_len,
296 u32 *out_sid, gfp_t gfp);
298 int security_context_str_to_sid(struct selinux_state *state,
299 const char *scontext, u32 *out_sid, gfp_t gfp);
301 int security_context_to_sid_default(struct selinux_state *state,
302 const char *scontext, u32 scontext_len,
303 u32 *out_sid, u32 def_sid, gfp_t gfp_flags);
305 int security_context_to_sid_force(struct selinux_state *state,
306 const char *scontext, u32 scontext_len,
309 int security_get_user_sids(struct selinux_state *state,
310 u32 callsid, char *username,
311 u32 **sids, u32 *nel);
313 int security_port_sid(struct selinux_state *state,
314 u8 protocol, u16 port, u32 *out_sid);
316 int security_ib_pkey_sid(struct selinux_state *state,
317 u64 subnet_prefix, u16 pkey_num, u32 *out_sid);
319 int security_ib_endport_sid(struct selinux_state *state,
320 const char *dev_name, u8 port_num, u32 *out_sid);
322 int security_netif_sid(struct selinux_state *state,
323 char *name, u32 *if_sid);
325 int security_node_sid(struct selinux_state *state,
326 u16 domain, void *addr, u32 addrlen,
329 int security_validate_transition(struct selinux_state *state,
330 u32 oldsid, u32 newsid, u32 tasksid,
333 int security_validate_transition_user(struct selinux_state *state,
334 u32 oldsid, u32 newsid, u32 tasksid,
337 int security_bounded_transition(struct selinux_state *state,
338 u32 oldsid, u32 newsid);
340 int security_sid_mls_copy(struct selinux_state *state,
341 u32 sid, u32 mls_sid, u32 *new_sid);
343 int security_net_peersid_resolve(struct selinux_state *state,
344 u32 nlbl_sid, u32 nlbl_type,
348 int security_get_classes(struct selinux_state *state,
349 char ***classes, int *nclasses);
350 int security_get_permissions(struct selinux_state *state,
351 char *class, char ***perms, int *nperms);
352 int security_get_reject_unknown(struct selinux_state *state);
353 int security_get_allow_unknown(struct selinux_state *state);
355 #define SECURITY_FS_USE_XATTR 1 /* use xattr */
356 #define SECURITY_FS_USE_TRANS 2 /* use transition SIDs, e.g. devpts/tmpfs */
357 #define SECURITY_FS_USE_TASK 3 /* use task SIDs, e.g. pipefs/sockfs */
358 #define SECURITY_FS_USE_GENFS 4 /* use the genfs support */
359 #define SECURITY_FS_USE_NONE 5 /* no labeling support */
360 #define SECURITY_FS_USE_MNTPOINT 6 /* use mountpoint labeling */
361 #define SECURITY_FS_USE_NATIVE 7 /* use native label support */
362 #define SECURITY_FS_USE_MAX 7 /* Highest SECURITY_FS_USE_XXX */
364 int security_fs_use(struct selinux_state *state, struct super_block *sb);
366 int security_genfs_sid(struct selinux_state *state,
367 const char *fstype, char *name, u16 sclass,
370 #ifdef CONFIG_NETLABEL
371 int security_netlbl_secattr_to_sid(struct selinux_state *state,
372 struct netlbl_lsm_secattr *secattr,
375 int security_netlbl_sid_to_secattr(struct selinux_state *state,
377 struct netlbl_lsm_secattr *secattr);
379 static inline int security_netlbl_secattr_to_sid(struct selinux_state *state,
380 struct netlbl_lsm_secattr *secattr,
386 static inline int security_netlbl_sid_to_secattr(struct selinux_state *state,
388 struct netlbl_lsm_secattr *secattr)
392 #endif /* CONFIG_NETLABEL */
394 const char *security_get_initial_sid_context(u32 sid);
397 * status notifier using mmap interface
399 extern struct page *selinux_kernel_status_page(struct selinux_state *state);
401 #define SELINUX_KERNEL_STATUS_VERSION 1
402 struct selinux_kernel_status {
403 u32 version; /* version number of thie structure */
404 u32 sequence; /* sequence number of seqlock logic */
405 u32 enforcing; /* current setting of enforcing mode */
406 u32 policyload; /* times of policy reloaded */
407 u32 deny_unknown; /* current setting of deny_unknown */
409 * The version > 0 supports above members.
413 extern void selinux_status_update_setenforce(struct selinux_state *state,
415 extern void selinux_status_update_policyload(struct selinux_state *state,
417 extern void selinux_complete_init(void);
418 extern int selinux_disable(struct selinux_state *state);
419 extern void exit_sel_fs(void);
420 extern struct path selinux_null;
421 extern struct vfsmount *selinuxfs_mount;
422 extern void selnl_notify_setenforce(int val);
423 extern void selnl_notify_policyload(u32 seqno);
424 extern int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm);
426 extern void avtab_cache_init(void);
427 extern void ebitmap_cache_init(void);
428 extern void hashtab_cache_init(void);
429 extern int security_sidtab_hash_stats(struct selinux_state *state, char *page);
431 #endif /* _SELINUX_SECURITY_H_ */