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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/rcupdate.h>
17#include <linux/refcount.h>
18#include <linux/workqueue.h>
19#include "flask.h"
20#include "policycap.h"
21
22#define SECSID_NULL 0x00000000 /* unspecified SID */
23#define SECSID_WILD 0xffffffff /* wildcard SID */
24#define SECCLASS_NULL 0x0000 /* no class */
25
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 */
47
48/* Range of policy versions we understand*/
49#define POLICYDB_VERSION_MIN POLICYDB_VERSION_BASE
50#define POLICYDB_VERSION_MAX POLICYDB_VERSION_COMP_FTRANS
51
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
66
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"
72
73struct netlbl_lsm_secattr;
74
75extern int selinux_enabled_boot;
76
77/*
78 * type_datum properties
79 * available at the kernel policy version >= POLICYDB_VERSION_BOUNDARY
80 */
81#define TYPEDATUM_PROPERTY_PRIMARY 0x0001
82#define TYPEDATUM_PROPERTY_ATTRIBUTE 0x0002
83
84/* limitation of boundary depth */
85#define POLICYDB_BOUNDS_MAXDEPTH 4
86
87struct selinux_avc;
88struct selinux_policy;
89
90struct selinux_state {
91#ifdef CONFIG_SECURITY_SELINUX_DISABLE
92 bool disabled;
93#endif
94#ifdef CONFIG_SECURITY_SELINUX_DEVELOP
95 bool enforcing;
96#endif
97 bool checkreqprot;
98 bool initialized;
99 bool policycap[__POLICYDB_CAP_MAX];
100
101 struct page *status_page;
102 struct mutex status_lock;
103
104 struct selinux_avc *avc;
105 struct selinux_policy __rcu *policy;
106 struct mutex policy_mutex;
107} __randomize_layout;
108
109void selinux_avc_init(struct selinux_avc **avc);
110
111extern struct selinux_state selinux_state;
112
113static inline bool selinux_initialized(const struct selinux_state *state)
114{
115 /* do a synchronized load to avoid race conditions */
116 return smp_load_acquire(&state->initialized);
117}
118
119static inline void selinux_mark_initialized(struct selinux_state *state)
120{
121 /* do a synchronized write to avoid race conditions */
122 smp_store_release(&state->initialized, true);
123}
124
125#ifdef CONFIG_SECURITY_SELINUX_DEVELOP
126static inline bool enforcing_enabled(struct selinux_state *state)
127{
128 return READ_ONCE(state->enforcing);
129}
130
131static inline void enforcing_set(struct selinux_state *state, bool value)
132{
133 WRITE_ONCE(state->enforcing, value);
134}
135#else
136static inline bool enforcing_enabled(struct selinux_state *state)
137{
138 return true;
139}
140
141static inline void enforcing_set(struct selinux_state *state, bool value)
142{
143}
144#endif
145
146static inline bool checkreqprot_get(const struct selinux_state *state)
147{
148 return READ_ONCE(state->checkreqprot);
149}
150
151static inline void checkreqprot_set(struct selinux_state *state, bool value)
152{
153 WRITE_ONCE(state->checkreqprot, value);
154}
155
156#ifdef CONFIG_SECURITY_SELINUX_DISABLE
157static inline bool selinux_disabled(struct selinux_state *state)
158{
159 return READ_ONCE(state->disabled);
160}
161
162static inline void selinux_mark_disabled(struct selinux_state *state)
163{
164 WRITE_ONCE(state->disabled, true);
165}
166#else
167static inline bool selinux_disabled(struct selinux_state *state)
168{
169 return false;
170}
171#endif
172
173static inline bool selinux_policycap_netpeer(void)
174{
175 struct selinux_state *state = &selinux_state;
176
177 return READ_ONCE(state->policycap[POLICYDB_CAP_NETPEER]);
178}
179
180static inline bool selinux_policycap_openperm(void)
181{
182 struct selinux_state *state = &selinux_state;
183
184 return READ_ONCE(state->policycap[POLICYDB_CAP_OPENPERM]);
185}
186
187static inline bool selinux_policycap_extsockclass(void)
188{
189 struct selinux_state *state = &selinux_state;
190
191 return READ_ONCE(state->policycap[POLICYDB_CAP_EXTSOCKCLASS]);
192}
193
194static inline bool selinux_policycap_alwaysnetwork(void)
195{
196 struct selinux_state *state = &selinux_state;
197
198 return READ_ONCE(state->policycap[POLICYDB_CAP_ALWAYSNETWORK]);
199}
200
201static inline bool selinux_policycap_cgroupseclabel(void)
202{
203 struct selinux_state *state = &selinux_state;
204
205 return READ_ONCE(state->policycap[POLICYDB_CAP_CGROUPSECLABEL]);
206}
207
208static inline bool selinux_policycap_nnp_nosuid_transition(void)
209{
210 struct selinux_state *state = &selinux_state;
211
212 return READ_ONCE(state->policycap[POLICYDB_CAP_NNP_NOSUID_TRANSITION]);
213}
214
215static inline bool selinux_policycap_genfs_seclabel_symlinks(void)
216{
217 struct selinux_state *state = &selinux_state;
218
219 return READ_ONCE(state->policycap[POLICYDB_CAP_GENFS_SECLABEL_SYMLINKS]);
220}
221
222static inline bool selinux_policycap_ioctl_skip_cloexec(void)
223{
224 struct selinux_state *state = &selinux_state;
225
226 return READ_ONCE(state->policycap[POLICYDB_CAP_IOCTL_SKIP_CLOEXEC]);
227}
228
229struct selinux_policy_convert_data;
230
231struct selinux_load_state {
232 struct selinux_policy *policy;
233 struct selinux_policy_convert_data *convert_data;
234};
235
236int security_mls_enabled(struct selinux_state *state);
237int security_load_policy(struct selinux_state *state,
238 void *data, size_t len,
239 struct selinux_load_state *load_state);
240void selinux_policy_commit(struct selinux_state *state,
241 struct selinux_load_state *load_state);
242void selinux_policy_cancel(struct selinux_state *state,
243 struct selinux_load_state *load_state);
244int security_read_policy(struct selinux_state *state,
245 void **data, size_t *len);
246int security_read_state_kernel(struct selinux_state *state,
247 void **data, size_t *len);
248int security_policycap_supported(struct selinux_state *state,
249 unsigned int req_cap);
250
251#define SEL_VEC_MAX 32
252struct av_decision {
253 u32 allowed;
254 u32 auditallow;
255 u32 auditdeny;
256 u32 seqno;
257 u32 flags;
258};
259
260#define XPERMS_ALLOWED 1
261#define XPERMS_AUDITALLOW 2
262#define XPERMS_DONTAUDIT 4
263
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)))
266struct extended_perms_data {
267 u32 p[8];
268};
269
270struct extended_perms_decision {
271 u8 used;
272 u8 driver;
273 struct extended_perms_data *allowed;
274 struct extended_perms_data *auditallow;
275 struct extended_perms_data *dontaudit;
276};
277
278struct extended_perms {
279 u16 len; /* length associated decision chain */
280 struct extended_perms_data drivers; /* flag drivers that are used */
281};
282
283/* definitions of av_decision.flags */
284#define AVD_FLAGS_PERMISSIVE 0x0001
285
286void security_compute_av(struct selinux_state *state,
287 u32 ssid, u32 tsid,
288 u16 tclass, struct av_decision *avd,
289 struct extended_perms *xperms);
290
291void security_compute_xperms_decision(struct selinux_state *state,
292 u32 ssid, u32 tsid, u16 tclass,
293 u8 driver,
294 struct extended_perms_decision *xpermd);
295
296void security_compute_av_user(struct selinux_state *state,
297 u32 ssid, u32 tsid,
298 u16 tclass, struct av_decision *avd);
299
300int security_transition_sid(struct selinux_state *state,
301 u32 ssid, u32 tsid, u16 tclass,
302 const struct qstr *qstr, u32 *out_sid);
303
304int security_transition_sid_user(struct selinux_state *state,
305 u32 ssid, u32 tsid, u16 tclass,
306 const char *objname, u32 *out_sid);
307
308int security_member_sid(struct selinux_state *state, u32 ssid, u32 tsid,
309 u16 tclass, u32 *out_sid);
310
311int security_change_sid(struct selinux_state *state, u32 ssid, u32 tsid,
312 u16 tclass, u32 *out_sid);
313
314int security_sid_to_context(struct selinux_state *state, u32 sid,
315 char **scontext, u32 *scontext_len);
316
317int security_sid_to_context_force(struct selinux_state *state,
318 u32 sid, char **scontext, u32 *scontext_len);
319
320int security_sid_to_context_inval(struct selinux_state *state,
321 u32 sid, char **scontext, u32 *scontext_len);
322
323int security_context_to_sid(struct selinux_state *state,
324 const char *scontext, u32 scontext_len,
325 u32 *out_sid, gfp_t gfp);
326
327int security_context_str_to_sid(struct selinux_state *state,
328 const char *scontext, u32 *out_sid, gfp_t gfp);
329
330int 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);
333
334int security_context_to_sid_force(struct selinux_state *state,
335 const char *scontext, u32 scontext_len,
336 u32 *sid);
337
338int security_get_user_sids(struct selinux_state *state,
339 u32 callsid, char *username,
340 u32 **sids, u32 *nel);
341
342int security_port_sid(struct selinux_state *state,
343 u8 protocol, u16 port, u32 *out_sid);
344
345int security_ib_pkey_sid(struct selinux_state *state,
346 u64 subnet_prefix, u16 pkey_num, u32 *out_sid);
347
348int security_ib_endport_sid(struct selinux_state *state,
349 const char *dev_name, u8 port_num, u32 *out_sid);
350
351int security_netif_sid(struct selinux_state *state,
352 char *name, u32 *if_sid);
353
354int security_node_sid(struct selinux_state *state,
355 u16 domain, void *addr, u32 addrlen,
356 u32 *out_sid);
357
358int security_validate_transition(struct selinux_state *state,
359 u32 oldsid, u32 newsid, u32 tasksid,
360 u16 tclass);
361
362int security_validate_transition_user(struct selinux_state *state,
363 u32 oldsid, u32 newsid, u32 tasksid,
364 u16 tclass);
365
366int security_bounded_transition(struct selinux_state *state,
367 u32 oldsid, u32 newsid);
368
369int security_sid_mls_copy(struct selinux_state *state,
370 u32 sid, u32 mls_sid, u32 *new_sid);
371
372int security_net_peersid_resolve(struct selinux_state *state,
373 u32 nlbl_sid, u32 nlbl_type,
374 u32 xfrm_sid,
375 u32 *peer_sid);
376
377int security_get_classes(struct selinux_policy *policy,
378 char ***classes, int *nclasses);
379int security_get_permissions(struct selinux_policy *policy,
380 char *class, char ***perms, int *nperms);
381int security_get_reject_unknown(struct selinux_state *state);
382int security_get_allow_unknown(struct selinux_state *state);
383
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 */
392
393int security_fs_use(struct selinux_state *state, struct super_block *sb);
394
395int security_genfs_sid(struct selinux_state *state,
396 const char *fstype, const char *path, u16 sclass,
397 u32 *sid);
398
399int selinux_policy_genfs_sid(struct selinux_policy *policy,
400 const char *fstype, const char *path, u16 sclass,
401 u32 *sid);
402
403#ifdef CONFIG_NETLABEL
404int security_netlbl_secattr_to_sid(struct selinux_state *state,
405 struct netlbl_lsm_secattr *secattr,
406 u32 *sid);
407
408int security_netlbl_sid_to_secattr(struct selinux_state *state,
409 u32 sid,
410 struct netlbl_lsm_secattr *secattr);
411#else
412static inline int security_netlbl_secattr_to_sid(struct selinux_state *state,
413 struct netlbl_lsm_secattr *secattr,
414 u32 *sid)
415{
416 return -EIDRM;
417}
418
419static inline int security_netlbl_sid_to_secattr(struct selinux_state *state,
420 u32 sid,
421 struct netlbl_lsm_secattr *secattr)
422{
423 return -ENOENT;
424}
425#endif /* CONFIG_NETLABEL */
426
427const char *security_get_initial_sid_context(u32 sid);
428
429/*
430 * status notifier using mmap interface
431 */
432extern struct page *selinux_kernel_status_page(struct selinux_state *state);
433
434#define SELINUX_KERNEL_STATUS_VERSION 1
435struct 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 */
441 /*
442 * The version > 0 supports above members.
443 */
444} __packed;
445
446extern void selinux_status_update_setenforce(struct selinux_state *state,
447 int enforcing);
448extern void selinux_status_update_policyload(struct selinux_state *state,
449 int seqno);
450extern void selinux_complete_init(void);
451extern int selinux_disable(struct selinux_state *state);
452extern void exit_sel_fs(void);
453extern struct path selinux_null;
454extern void selnl_notify_setenforce(int val);
455extern void selnl_notify_policyload(u32 seqno);
456extern int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm);
457
458extern void avtab_cache_init(void);
459extern void ebitmap_cache_init(void);
460extern void hashtab_cache_init(void);
461extern int security_sidtab_hash_stats(struct selinux_state *state, char *page);
462
463#endif /* _SELINUX_SECURITY_H_ */