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
68 struct netlbl_lsm_secattr;
69
70 extern int selinux_enabled;
71
72 /* Policy capabilities */
73 enum {
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
84 extern 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
96 struct selinux_avc;
97 struct selinux_ss;
98
99 struct 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
111 void selinux_ss_init(struct selinux_ss **ss);
112 void selinux_avc_init(struct selinux_avc **avc);
113
114 extern struct selinux_state selinux_state;
115
116 #ifdef CONFIG_SECURITY_SELINUX_DEVELOP
enforcing_enabled(struct selinux_state * state)117 static inline bool enforcing_enabled(struct selinux_state *state)
118 {
119 return state->enforcing;
120 }
121
enforcing_set(struct selinux_state * state,bool value)122 static inline void enforcing_set(struct selinux_state *state, bool value)
123 {
124 state->enforcing = value;
125 }
126 #else
enforcing_enabled(struct selinux_state * state)127 static inline bool enforcing_enabled(struct selinux_state *state)
128 {
129 return true;
130 }
131
enforcing_set(struct selinux_state * state,bool value)132 static inline void enforcing_set(struct selinux_state *state, bool value)
133 {
134 }
135 #endif
136
selinux_policycap_netpeer(void)137 static inline bool selinux_policycap_netpeer(void)
138 {
139 struct selinux_state *state = &selinux_state;
140
141 return state->policycap[POLICYDB_CAPABILITY_NETPEER];
142 }
143
selinux_policycap_openperm(void)144 static inline bool selinux_policycap_openperm(void)
145 {
146 struct selinux_state *state = &selinux_state;
147
148 return state->policycap[POLICYDB_CAPABILITY_OPENPERM];
149 }
150
selinux_policycap_extsockclass(void)151 static inline bool selinux_policycap_extsockclass(void)
152 {
153 struct selinux_state *state = &selinux_state;
154
155 return state->policycap[POLICYDB_CAPABILITY_EXTSOCKCLASS];
156 }
157
selinux_policycap_alwaysnetwork(void)158 static inline bool selinux_policycap_alwaysnetwork(void)
159 {
160 struct selinux_state *state = &selinux_state;
161
162 return state->policycap[POLICYDB_CAPABILITY_ALWAYSNETWORK];
163 }
164
selinux_policycap_cgroupseclabel(void)165 static inline bool selinux_policycap_cgroupseclabel(void)
166 {
167 struct selinux_state *state = &selinux_state;
168
169 return state->policycap[POLICYDB_CAPABILITY_CGROUPSECLABEL];
170 }
171
selinux_policycap_nnp_nosuid_transition(void)172 static 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
179 int security_mls_enabled(struct selinux_state *state);
180 int security_load_policy(struct selinux_state *state,
181 void *data, size_t len);
182 int security_read_policy(struct selinux_state *state,
183 void **data, size_t *len);
184 size_t security_policydb_len(struct selinux_state *state);
185
186 int security_policycap_supported(struct selinux_state *state,
187 unsigned int req_cap);
188
189 #define SEL_VEC_MAX 32
190 struct 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)))
204 struct extended_perms_data {
205 u32 p[8];
206 };
207
208 struct 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
216 struct 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
224 void 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
229 void 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
234 void security_compute_av_user(struct selinux_state *state,
235 u32 ssid, u32 tsid,
236 u16 tclass, struct av_decision *avd);
237
238 int security_transition_sid(struct selinux_state *state,
239 u32 ssid, u32 tsid, u16 tclass,
240 const struct qstr *qstr, u32 *out_sid);
241
242 int security_transition_sid_user(struct selinux_state *state,
243 u32 ssid, u32 tsid, u16 tclass,
244 const char *objname, u32 *out_sid);
245
246 int security_member_sid(struct selinux_state *state, u32 ssid, u32 tsid,
247 u16 tclass, u32 *out_sid);
248
249 int security_change_sid(struct selinux_state *state, u32 ssid, u32 tsid,
250 u16 tclass, u32 *out_sid);
251
252 int security_sid_to_context(struct selinux_state *state, u32 sid,
253 char **scontext, u32 *scontext_len);
254
255 int security_sid_to_context_force(struct selinux_state *state,
256 u32 sid, char **scontext, u32 *scontext_len);
257
258 int security_context_to_sid(struct selinux_state *state,
259 const char *scontext, u32 scontext_len,
260 u32 *out_sid, gfp_t gfp);
261
262 int security_context_str_to_sid(struct selinux_state *state,
263 const char *scontext, u32 *out_sid, gfp_t gfp);
264
265 int 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
269 int security_context_to_sid_force(struct selinux_state *state,
270 const char *scontext, u32 scontext_len,
271 u32 *sid);
272
273 int security_get_user_sids(struct selinux_state *state,
274 u32 callsid, char *username,
275 u32 **sids, u32 *nel);
276
277 int security_port_sid(struct selinux_state *state,
278 u8 protocol, u16 port, u32 *out_sid);
279
280 int security_ib_pkey_sid(struct selinux_state *state,
281 u64 subnet_prefix, u16 pkey_num, u32 *out_sid);
282
283 int security_ib_endport_sid(struct selinux_state *state,
284 const char *dev_name, u8 port_num, u32 *out_sid);
285
286 int security_netif_sid(struct selinux_state *state,
287 char *name, u32 *if_sid);
288
289 int security_node_sid(struct selinux_state *state,
290 u16 domain, void *addr, u32 addrlen,
291 u32 *out_sid);
292
293 int security_validate_transition(struct selinux_state *state,
294 u32 oldsid, u32 newsid, u32 tasksid,
295 u16 tclass);
296
297 int security_validate_transition_user(struct selinux_state *state,
298 u32 oldsid, u32 newsid, u32 tasksid,
299 u16 tclass);
300
301 int security_bounded_transition(struct selinux_state *state,
302 u32 oldsid, u32 newsid);
303
304 int security_sid_mls_copy(struct selinux_state *state,
305 u32 sid, u32 mls_sid, u32 *new_sid);
306
307 int security_net_peersid_resolve(struct selinux_state *state,
308 u32 nlbl_sid, u32 nlbl_type,
309 u32 xfrm_sid,
310 u32 *peer_sid);
311
312 int security_get_classes(struct selinux_state *state,
313 char ***classes, int *nclasses);
314 int security_get_permissions(struct selinux_state *state,
315 char *class, char ***perms, int *nperms);
316 int security_get_reject_unknown(struct selinux_state *state);
317 int 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
328 int security_fs_use(struct selinux_state *state, struct super_block *sb);
329
330 int security_genfs_sid(struct selinux_state *state,
331 const char *fstype, char *name, u16 sclass,
332 u32 *sid);
333
334 #ifdef CONFIG_NETLABEL
335 int security_netlbl_secattr_to_sid(struct selinux_state *state,
336 struct netlbl_lsm_secattr *secattr,
337 u32 *sid);
338
339 int security_netlbl_sid_to_secattr(struct selinux_state *state,
340 u32 sid,
341 struct netlbl_lsm_secattr *secattr);
342 #else
security_netlbl_secattr_to_sid(struct selinux_state * state,struct netlbl_lsm_secattr * secattr,u32 * sid)343 static 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
security_netlbl_sid_to_secattr(struct selinux_state * state,u32 sid,struct netlbl_lsm_secattr * secattr)350 static 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
358 const char *security_get_initial_sid_context(u32 sid);
359
360 /*
361 * status notifier using mmap interface
362 */
363 extern struct page *selinux_kernel_status_page(struct selinux_state *state);
364
365 #define SELINUX_KERNEL_STATUS_VERSION 1
366 struct 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
377 extern void selinux_status_update_setenforce(struct selinux_state *state,
378 int enforcing);
379 extern void selinux_status_update_policyload(struct selinux_state *state,
380 int seqno);
381 extern void selinux_complete_init(void);
382 extern int selinux_disable(struct selinux_state *state);
383 extern void exit_sel_fs(void);
384 extern struct path selinux_null;
385 extern struct vfsmount *selinuxfs_mount;
386 extern void selnl_notify_setenforce(int val);
387 extern void selnl_notify_policyload(u32 seqno);
388 extern int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm);
389
390 extern void avtab_cache_init(void);
391 extern void ebitmap_cache_init(void);
392 extern void hashtab_cache_init(void);
393
394 #endif /* _SELINUX_SECURITY_H_ */
395
