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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/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
68struct netlbl_lsm_secattr;
69
70extern int selinux_enabled;
71
72/* Policy capabilities */
73enum {
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
84extern 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
96struct selinux_avc;
97struct selinux_ss;
98
99struct 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
111void selinux_ss_init(struct selinux_ss **ss);
112void selinux_avc_init(struct selinux_avc **avc);
113
114extern struct selinux_state selinux_state;
115
116#ifdef CONFIG_SECURITY_SELINUX_DEVELOP
117static inline bool enforcing_enabled(struct selinux_state *state)
118{
119 return state->enforcing;
120}
121
122static inline void enforcing_set(struct selinux_state *state, bool value)
123{
124 state->enforcing = value;
125}
126#else
127static inline bool enforcing_enabled(struct selinux_state *state)
128{
129 return true;
130}
131
132static inline void enforcing_set(struct selinux_state *state, bool value)
133{
134}
135#endif
136
137static inline bool selinux_policycap_netpeer(void)
138{
139 struct selinux_state *state = &selinux_state;
140
141 return state->policycap[POLICYDB_CAPABILITY_NETPEER];
142}
143
144static inline bool selinux_policycap_openperm(void)
145{
146 struct selinux_state *state = &selinux_state;
147
148 return state->policycap[POLICYDB_CAPABILITY_OPENPERM];
149}
150
151static inline bool selinux_policycap_extsockclass(void)
152{
153 struct selinux_state *state = &selinux_state;
154
155 return state->policycap[POLICYDB_CAPABILITY_EXTSOCKCLASS];
156}
157
158static inline bool selinux_policycap_alwaysnetwork(void)
159{
160 struct selinux_state *state = &selinux_state;
161
162 return state->policycap[POLICYDB_CAPABILITY_ALWAYSNETWORK];
163}
164
165static inline bool selinux_policycap_cgroupseclabel(void)
166{
167 struct selinux_state *state = &selinux_state;
168
169 return state->policycap[POLICYDB_CAPABILITY_CGROUPSECLABEL];
170}
171
172static 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
179int security_mls_enabled(struct selinux_state *state);
180int security_load_policy(struct selinux_state *state,
181 void *data, size_t len);
182int security_read_policy(struct selinux_state *state,
183 void **data, size_t *len);
184size_t security_policydb_len(struct selinux_state *state);
185
186int security_policycap_supported(struct selinux_state *state,
187 unsigned int req_cap);
188
189#define SEL_VEC_MAX 32
190struct 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)))
204struct extended_perms_data {
205 u32 p[8];
206};
207
208struct 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
216struct 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
224void 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
229void 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
234void security_compute_av_user(struct selinux_state *state,
235 u32 ssid, u32 tsid,
236 u16 tclass, struct av_decision *avd);
237
238int security_transition_sid(struct selinux_state *state,
239 u32 ssid, u32 tsid, u16 tclass,
240 const struct qstr *qstr, u32 *out_sid);
241
242int security_transition_sid_user(struct selinux_state *state,
243 u32 ssid, u32 tsid, u16 tclass,
244 const char *objname, u32 *out_sid);
245
246int security_member_sid(struct selinux_state *state, u32 ssid, u32 tsid,
247 u16 tclass, u32 *out_sid);
248
249int security_change_sid(struct selinux_state *state, u32 ssid, u32 tsid,
250 u16 tclass, u32 *out_sid);
251
252int security_sid_to_context(struct selinux_state *state, u32 sid,
253 char **scontext, u32 *scontext_len);
254
255int security_sid_to_context_force(struct selinux_state *state,
256 u32 sid, char **scontext, u32 *scontext_len);
257
258int security_context_to_sid(struct selinux_state *state,
259 const char *scontext, u32 scontext_len,
260 u32 *out_sid, gfp_t gfp);
261
262int security_context_str_to_sid(struct selinux_state *state,
263 const char *scontext, u32 *out_sid, gfp_t gfp);
264
265int 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
269int security_context_to_sid_force(struct selinux_state *state,
270 const char *scontext, u32 scontext_len,
271 u32 *sid);
272
273int security_get_user_sids(struct selinux_state *state,
274 u32 callsid, char *username,
275 u32 **sids, u32 *nel);
276
277int security_port_sid(struct selinux_state *state,
278 u8 protocol, u16 port, u32 *out_sid);
279
280int security_ib_pkey_sid(struct selinux_state *state,
281 u64 subnet_prefix, u16 pkey_num, u32 *out_sid);
282
283int security_ib_endport_sid(struct selinux_state *state,
284 const char *dev_name, u8 port_num, u32 *out_sid);
285
286int security_netif_sid(struct selinux_state *state,
287 char *name, u32 *if_sid);
288
289int security_node_sid(struct selinux_state *state,
290 u16 domain, void *addr, u32 addrlen,
291 u32 *out_sid);
292
293int security_validate_transition(struct selinux_state *state,
294 u32 oldsid, u32 newsid, u32 tasksid,
295 u16 tclass);
296
297int security_validate_transition_user(struct selinux_state *state,
298 u32 oldsid, u32 newsid, u32 tasksid,
299 u16 tclass);
300
301int security_bounded_transition(struct selinux_state *state,
302 u32 oldsid, u32 newsid);
303
304int security_sid_mls_copy(struct selinux_state *state,
305 u32 sid, u32 mls_sid, u32 *new_sid);
306
307int security_net_peersid_resolve(struct selinux_state *state,
308 u32 nlbl_sid, u32 nlbl_type,
309 u32 xfrm_sid,
310 u32 *peer_sid);
311
312int security_get_classes(struct selinux_state *state,
313 char ***classes, int *nclasses);
314int security_get_permissions(struct selinux_state *state,
315 char *class, char ***perms, int *nperms);
316int security_get_reject_unknown(struct selinux_state *state);
317int 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
328int security_fs_use(struct selinux_state *state, struct super_block *sb);
329
330int security_genfs_sid(struct selinux_state *state,
331 const char *fstype, char *name, u16 sclass,
332 u32 *sid);
333
334#ifdef CONFIG_NETLABEL
335int security_netlbl_secattr_to_sid(struct selinux_state *state,
336 struct netlbl_lsm_secattr *secattr,
337 u32 *sid);
338
339int security_netlbl_sid_to_secattr(struct selinux_state *state,
340 u32 sid,
341 struct netlbl_lsm_secattr *secattr);
342#else
343static 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
350static 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
358const char *security_get_initial_sid_context(u32 sid);
359
360/*
361 * status notifier using mmap interface
362 */
363extern struct page *selinux_kernel_status_page(struct selinux_state *state);
364
365#define SELINUX_KERNEL_STATUS_VERSION 1
366struct 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
377extern void selinux_status_update_setenforce(struct selinux_state *state,
378 int enforcing);
379extern void selinux_status_update_policyload(struct selinux_state *state,
380 int seqno);
381extern void selinux_complete_init(void);
382extern int selinux_disable(struct selinux_state *state);
383extern void exit_sel_fs(void);
384extern struct path selinux_null;
385extern struct vfsmount *selinuxfs_mount;
386extern void selnl_notify_setenforce(int val);
387extern void selnl_notify_policyload(u32 seqno);
388extern int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm);
389
390extern void avtab_cache_init(void);
391extern void ebitmap_cache_init(void);
392extern void hashtab_cache_init(void);
393
394#endif /* _SELINUX_SECURITY_H_ */