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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#define POLICYDB_VERSION_GLBLUB 32
44
45/* Range of policy versions we understand*/
46#define POLICYDB_VERSION_MIN POLICYDB_VERSION_BASE
47#define POLICYDB_VERSION_MAX POLICYDB_VERSION_GLBLUB
48
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
63
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"
69
70struct netlbl_lsm_secattr;
71
72extern int selinux_enabled;
73
74/* Policy capabilities */
75enum {
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
83};
84#define POLICYDB_CAPABILITY_MAX (__POLICYDB_CAPABILITY_MAX - 1)
85
86extern const char *selinux_policycap_names[__POLICYDB_CAPABILITY_MAX];
87
88/*
89 * type_datum properties
90 * available at the kernel policy version >= POLICYDB_VERSION_BOUNDARY
91 */
92#define TYPEDATUM_PROPERTY_PRIMARY 0x0001
93#define TYPEDATUM_PROPERTY_ATTRIBUTE 0x0002
94
95/* limitation of boundary depth */
96#define POLICYDB_BOUNDS_MAXDEPTH 4
97
98struct selinux_avc;
99struct selinux_ss;
100
101struct selinux_state {
102 bool disabled;
103#ifdef CONFIG_SECURITY_SELINUX_DEVELOP
104 bool enforcing;
105#endif
106 bool checkreqprot;
107 bool initialized;
108 bool policycap[__POLICYDB_CAPABILITY_MAX];
109 struct selinux_avc *avc;
110 struct selinux_ss *ss;
111};
112
113void selinux_ss_init(struct selinux_ss **ss);
114void selinux_avc_init(struct selinux_avc **avc);
115
116extern struct selinux_state selinux_state;
117
118#ifdef CONFIG_SECURITY_SELINUX_DEVELOP
119static inline bool enforcing_enabled(struct selinux_state *state)
120{
121 return state->enforcing;
122}
123
124static inline void enforcing_set(struct selinux_state *state, bool value)
125{
126 state->enforcing = value;
127}
128#else
129static inline bool enforcing_enabled(struct selinux_state *state)
130{
131 return true;
132}
133
134static inline void enforcing_set(struct selinux_state *state, bool value)
135{
136}
137#endif
138
139static inline bool selinux_policycap_netpeer(void)
140{
141 struct selinux_state *state = &selinux_state;
142
143 return state->policycap[POLICYDB_CAPABILITY_NETPEER];
144}
145
146static inline bool selinux_policycap_openperm(void)
147{
148 struct selinux_state *state = &selinux_state;
149
150 return state->policycap[POLICYDB_CAPABILITY_OPENPERM];
151}
152
153static inline bool selinux_policycap_extsockclass(void)
154{
155 struct selinux_state *state = &selinux_state;
156
157 return state->policycap[POLICYDB_CAPABILITY_EXTSOCKCLASS];
158}
159
160static inline bool selinux_policycap_alwaysnetwork(void)
161{
162 struct selinux_state *state = &selinux_state;
163
164 return state->policycap[POLICYDB_CAPABILITY_ALWAYSNETWORK];
165}
166
167static inline bool selinux_policycap_cgroupseclabel(void)
168{
169 struct selinux_state *state = &selinux_state;
170
171 return state->policycap[POLICYDB_CAPABILITY_CGROUPSECLABEL];
172}
173
174static inline bool selinux_policycap_nnp_nosuid_transition(void)
175{
176 struct selinux_state *state = &selinux_state;
177
178 return state->policycap[POLICYDB_CAPABILITY_NNP_NOSUID_TRANSITION];
179}
180
181int security_mls_enabled(struct selinux_state *state);
182int security_load_policy(struct selinux_state *state,
183 void *data, size_t len);
184int security_read_policy(struct selinux_state *state,
185 void **data, size_t *len);
186size_t security_policydb_len(struct selinux_state *state);
187
188int security_policycap_supported(struct selinux_state *state,
189 unsigned int req_cap);
190
191#define SEL_VEC_MAX 32
192struct av_decision {
193 u32 allowed;
194 u32 auditallow;
195 u32 auditdeny;
196 u32 seqno;
197 u32 flags;
198};
199
200#define XPERMS_ALLOWED 1
201#define XPERMS_AUDITALLOW 2
202#define XPERMS_DONTAUDIT 4
203
204#define security_xperm_set(perms, x) (perms[x >> 5] |= 1 << (x & 0x1f))
205#define security_xperm_test(perms, x) (1 & (perms[x >> 5] >> (x & 0x1f)))
206struct extended_perms_data {
207 u32 p[8];
208};
209
210struct extended_perms_decision {
211 u8 used;
212 u8 driver;
213 struct extended_perms_data *allowed;
214 struct extended_perms_data *auditallow;
215 struct extended_perms_data *dontaudit;
216};
217
218struct extended_perms {
219 u16 len; /* length associated decision chain */
220 struct extended_perms_data drivers; /* flag drivers that are used */
221};
222
223/* definitions of av_decision.flags */
224#define AVD_FLAGS_PERMISSIVE 0x0001
225
226void security_compute_av(struct selinux_state *state,
227 u32 ssid, u32 tsid,
228 u16 tclass, struct av_decision *avd,
229 struct extended_perms *xperms);
230
231void security_compute_xperms_decision(struct selinux_state *state,
232 u32 ssid, u32 tsid, u16 tclass,
233 u8 driver,
234 struct extended_perms_decision *xpermd);
235
236void security_compute_av_user(struct selinux_state *state,
237 u32 ssid, u32 tsid,
238 u16 tclass, struct av_decision *avd);
239
240int security_transition_sid(struct selinux_state *state,
241 u32 ssid, u32 tsid, u16 tclass,
242 const struct qstr *qstr, u32 *out_sid);
243
244int security_transition_sid_user(struct selinux_state *state,
245 u32 ssid, u32 tsid, u16 tclass,
246 const char *objname, u32 *out_sid);
247
248int security_member_sid(struct selinux_state *state, u32 ssid, u32 tsid,
249 u16 tclass, u32 *out_sid);
250
251int security_change_sid(struct selinux_state *state, u32 ssid, u32 tsid,
252 u16 tclass, u32 *out_sid);
253
254int security_sid_to_context(struct selinux_state *state, u32 sid,
255 char **scontext, u32 *scontext_len);
256
257int security_sid_to_context_force(struct selinux_state *state,
258 u32 sid, char **scontext, u32 *scontext_len);
259
260int security_sid_to_context_inval(struct selinux_state *state,
261 u32 sid, char **scontext, u32 *scontext_len);
262
263int security_context_to_sid(struct selinux_state *state,
264 const char *scontext, u32 scontext_len,
265 u32 *out_sid, gfp_t gfp);
266
267int security_context_str_to_sid(struct selinux_state *state,
268 const char *scontext, u32 *out_sid, gfp_t gfp);
269
270int security_context_to_sid_default(struct selinux_state *state,
271 const char *scontext, u32 scontext_len,
272 u32 *out_sid, u32 def_sid, gfp_t gfp_flags);
273
274int security_context_to_sid_force(struct selinux_state *state,
275 const char *scontext, u32 scontext_len,
276 u32 *sid);
277
278int security_get_user_sids(struct selinux_state *state,
279 u32 callsid, char *username,
280 u32 **sids, u32 *nel);
281
282int security_port_sid(struct selinux_state *state,
283 u8 protocol, u16 port, u32 *out_sid);
284
285int security_ib_pkey_sid(struct selinux_state *state,
286 u64 subnet_prefix, u16 pkey_num, u32 *out_sid);
287
288int security_ib_endport_sid(struct selinux_state *state,
289 const char *dev_name, u8 port_num, u32 *out_sid);
290
291int security_netif_sid(struct selinux_state *state,
292 char *name, u32 *if_sid);
293
294int security_node_sid(struct selinux_state *state,
295 u16 domain, void *addr, u32 addrlen,
296 u32 *out_sid);
297
298int security_validate_transition(struct selinux_state *state,
299 u32 oldsid, u32 newsid, u32 tasksid,
300 u16 tclass);
301
302int security_validate_transition_user(struct selinux_state *state,
303 u32 oldsid, u32 newsid, u32 tasksid,
304 u16 tclass);
305
306int security_bounded_transition(struct selinux_state *state,
307 u32 oldsid, u32 newsid);
308
309int security_sid_mls_copy(struct selinux_state *state,
310 u32 sid, u32 mls_sid, u32 *new_sid);
311
312int security_net_peersid_resolve(struct selinux_state *state,
313 u32 nlbl_sid, u32 nlbl_type,
314 u32 xfrm_sid,
315 u32 *peer_sid);
316
317int security_get_classes(struct selinux_state *state,
318 char ***classes, int *nclasses);
319int security_get_permissions(struct selinux_state *state,
320 char *class, char ***perms, int *nperms);
321int security_get_reject_unknown(struct selinux_state *state);
322int security_get_allow_unknown(struct selinux_state *state);
323
324#define SECURITY_FS_USE_XATTR 1 /* use xattr */
325#define SECURITY_FS_USE_TRANS 2 /* use transition SIDs, e.g. devpts/tmpfs */
326#define SECURITY_FS_USE_TASK 3 /* use task SIDs, e.g. pipefs/sockfs */
327#define SECURITY_FS_USE_GENFS 4 /* use the genfs support */
328#define SECURITY_FS_USE_NONE 5 /* no labeling support */
329#define SECURITY_FS_USE_MNTPOINT 6 /* use mountpoint labeling */
330#define SECURITY_FS_USE_NATIVE 7 /* use native label support */
331#define SECURITY_FS_USE_MAX 7 /* Highest SECURITY_FS_USE_XXX */
332
333int security_fs_use(struct selinux_state *state, struct super_block *sb);
334
335int security_genfs_sid(struct selinux_state *state,
336 const char *fstype, char *name, u16 sclass,
337 u32 *sid);
338
339#ifdef CONFIG_NETLABEL
340int security_netlbl_secattr_to_sid(struct selinux_state *state,
341 struct netlbl_lsm_secattr *secattr,
342 u32 *sid);
343
344int security_netlbl_sid_to_secattr(struct selinux_state *state,
345 u32 sid,
346 struct netlbl_lsm_secattr *secattr);
347#else
348static inline int security_netlbl_secattr_to_sid(struct selinux_state *state,
349 struct netlbl_lsm_secattr *secattr,
350 u32 *sid)
351{
352 return -EIDRM;
353}
354
355static inline int security_netlbl_sid_to_secattr(struct selinux_state *state,
356 u32 sid,
357 struct netlbl_lsm_secattr *secattr)
358{
359 return -ENOENT;
360}
361#endif /* CONFIG_NETLABEL */
362
363const char *security_get_initial_sid_context(u32 sid);
364
365/*
366 * status notifier using mmap interface
367 */
368extern struct page *selinux_kernel_status_page(struct selinux_state *state);
369
370#define SELINUX_KERNEL_STATUS_VERSION 1
371struct selinux_kernel_status {
372 u32 version; /* version number of thie structure */
373 u32 sequence; /* sequence number of seqlock logic */
374 u32 enforcing; /* current setting of enforcing mode */
375 u32 policyload; /* times of policy reloaded */
376 u32 deny_unknown; /* current setting of deny_unknown */
377 /*
378 * The version > 0 supports above members.
379 */
380} __packed;
381
382extern void selinux_status_update_setenforce(struct selinux_state *state,
383 int enforcing);
384extern void selinux_status_update_policyload(struct selinux_state *state,
385 int seqno);
386extern void selinux_complete_init(void);
387extern int selinux_disable(struct selinux_state *state);
388extern void exit_sel_fs(void);
389extern struct path selinux_null;
390extern struct vfsmount *selinuxfs_mount;
391extern void selnl_notify_setenforce(int val);
392extern void selnl_notify_policyload(u32 seqno);
393extern int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm);
394
395extern void avtab_cache_init(void);
396extern void ebitmap_cache_init(void);
397extern void hashtab_cache_init(void);
398
399#endif /* _SELINUX_SECURITY_H_ */