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 #define SE_SBGENFS_XATTR 0x0800
62
63 #define CONTEXT_STR "context"
64 #define FSCONTEXT_STR "fscontext"
65 #define ROOTCONTEXT_STR "rootcontext"
66 #define DEFCONTEXT_STR "defcontext"
67 #define SECLABEL_STR "seclabel"
68
69 struct netlbl_lsm_secattr;
70
71 extern int selinux_enabled;
72
73 /* Policy capabilities */
74 enum {
75 POLICYDB_CAPABILITY_NETPEER,
76 POLICYDB_CAPABILITY_OPENPERM,
77 POLICYDB_CAPABILITY_EXTSOCKCLASS,
78 POLICYDB_CAPABILITY_ALWAYSNETWORK,
79 POLICYDB_CAPABILITY_CGROUPSECLABEL,
80 POLICYDB_CAPABILITY_NNP_NOSUID_TRANSITION,
81 __POLICYDB_CAPABILITY_MAX
82 };
83 #define POLICYDB_CAPABILITY_MAX (__POLICYDB_CAPABILITY_MAX - 1)
84
85 extern const char *selinux_policycap_names[__POLICYDB_CAPABILITY_MAX];
86
87 /*
88 * type_datum properties
89 * available at the kernel policy version >= POLICYDB_VERSION_BOUNDARY
90 */
91 #define TYPEDATUM_PROPERTY_PRIMARY 0x0001
92 #define TYPEDATUM_PROPERTY_ATTRIBUTE 0x0002
93
94 /* limitation of boundary depth */
95 #define POLICYDB_BOUNDS_MAXDEPTH 4
96
97 struct selinux_avc;
98 struct selinux_ss;
99
100 struct selinux_state {
101 bool disabled;
102 #ifdef CONFIG_SECURITY_SELINUX_DEVELOP
103 bool enforcing;
104 #endif
105 bool checkreqprot;
106 bool initialized;
107 bool policycap[__POLICYDB_CAPABILITY_MAX];
108 bool android_netlink_route;
109 struct selinux_avc *avc;
110 struct selinux_ss *ss;
111 };
112
113 void selinux_ss_init(struct selinux_ss **ss);
114 void selinux_avc_init(struct selinux_avc **avc);
115
116 extern struct selinux_state selinux_state;
117
118 #ifdef CONFIG_SECURITY_SELINUX_DEVELOP
enforcing_enabled(struct selinux_state * state)119 static inline bool enforcing_enabled(struct selinux_state *state)
120 {
121 return state->enforcing;
122 }
123
enforcing_set(struct selinux_state * state,bool value)124 static inline void enforcing_set(struct selinux_state *state, bool value)
125 {
126 state->enforcing = value;
127 }
128 #else
enforcing_enabled(struct selinux_state * state)129 static inline bool enforcing_enabled(struct selinux_state *state)
130 {
131 return true;
132 }
133
enforcing_set(struct selinux_state * state,bool value)134 static inline void enforcing_set(struct selinux_state *state, bool value)
135 {
136 }
137 #endif
138
selinux_policycap_netpeer(void)139 static inline bool selinux_policycap_netpeer(void)
140 {
141 struct selinux_state *state = &selinux_state;
142
143 return state->policycap[POLICYDB_CAPABILITY_NETPEER];
144 }
145
selinux_policycap_openperm(void)146 static inline bool selinux_policycap_openperm(void)
147 {
148 struct selinux_state *state = &selinux_state;
149
150 return state->policycap[POLICYDB_CAPABILITY_OPENPERM];
151 }
152
selinux_policycap_extsockclass(void)153 static inline bool selinux_policycap_extsockclass(void)
154 {
155 struct selinux_state *state = &selinux_state;
156
157 return state->policycap[POLICYDB_CAPABILITY_EXTSOCKCLASS];
158 }
159
selinux_policycap_alwaysnetwork(void)160 static inline bool selinux_policycap_alwaysnetwork(void)
161 {
162 struct selinux_state *state = &selinux_state;
163
164 return state->policycap[POLICYDB_CAPABILITY_ALWAYSNETWORK];
165 }
166
selinux_policycap_cgroupseclabel(void)167 static inline bool selinux_policycap_cgroupseclabel(void)
168 {
169 struct selinux_state *state = &selinux_state;
170
171 return state->policycap[POLICYDB_CAPABILITY_CGROUPSECLABEL];
172 }
173
selinux_policycap_nnp_nosuid_transition(void)174 static 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
selinux_android_nlroute_getlink(void)181 static inline bool selinux_android_nlroute_getlink(void)
182 {
183 struct selinux_state *state = &selinux_state;
184
185 return state->android_netlink_route;
186 }
187
188 int security_mls_enabled(struct selinux_state *state);
189 int security_load_policy(struct selinux_state *state,
190 void *data, size_t len);
191 int security_read_policy(struct selinux_state *state,
192 void **data, size_t *len);
193 size_t security_policydb_len(struct selinux_state *state);
194
195 int security_policycap_supported(struct selinux_state *state,
196 unsigned int req_cap);
197
198 #define SEL_VEC_MAX 32
199 struct av_decision {
200 u32 allowed;
201 u32 auditallow;
202 u32 auditdeny;
203 u32 seqno;
204 u32 flags;
205 };
206
207 #define XPERMS_ALLOWED 1
208 #define XPERMS_AUDITALLOW 2
209 #define XPERMS_DONTAUDIT 4
210
211 #define security_xperm_set(perms, x) (perms[x >> 5] |= 1 << (x & 0x1f))
212 #define security_xperm_test(perms, x) (1 & (perms[x >> 5] >> (x & 0x1f)))
213 struct extended_perms_data {
214 u32 p[8];
215 };
216
217 struct extended_perms_decision {
218 u8 used;
219 u8 driver;
220 struct extended_perms_data *allowed;
221 struct extended_perms_data *auditallow;
222 struct extended_perms_data *dontaudit;
223 };
224
225 struct extended_perms {
226 u16 len; /* length associated decision chain */
227 struct extended_perms_data drivers; /* flag drivers that are used */
228 };
229
230 /* definitions of av_decision.flags */
231 #define AVD_FLAGS_PERMISSIVE 0x0001
232
233 void security_compute_av(struct selinux_state *state,
234 u32 ssid, u32 tsid,
235 u16 tclass, struct av_decision *avd,
236 struct extended_perms *xperms);
237
238 void security_compute_xperms_decision(struct selinux_state *state,
239 u32 ssid, u32 tsid, u16 tclass,
240 u8 driver,
241 struct extended_perms_decision *xpermd);
242
243 void security_compute_av_user(struct selinux_state *state,
244 u32 ssid, u32 tsid,
245 u16 tclass, struct av_decision *avd);
246
247 int security_transition_sid(struct selinux_state *state,
248 u32 ssid, u32 tsid, u16 tclass,
249 const struct qstr *qstr, u32 *out_sid);
250
251 int security_transition_sid_user(struct selinux_state *state,
252 u32 ssid, u32 tsid, u16 tclass,
253 const char *objname, u32 *out_sid);
254
255 int security_member_sid(struct selinux_state *state, u32 ssid, u32 tsid,
256 u16 tclass, u32 *out_sid);
257
258 int security_change_sid(struct selinux_state *state, u32 ssid, u32 tsid,
259 u16 tclass, u32 *out_sid);
260
261 int security_sid_to_context(struct selinux_state *state, u32 sid,
262 char **scontext, u32 *scontext_len);
263
264 int security_sid_to_context_force(struct selinux_state *state,
265 u32 sid, char **scontext, u32 *scontext_len);
266
267 int security_sid_to_context_inval(struct selinux_state *state,
268 u32 sid, char **scontext, u32 *scontext_len);
269
270 int security_context_to_sid(struct selinux_state *state,
271 const char *scontext, u32 scontext_len,
272 u32 *out_sid, gfp_t gfp);
273
274 int security_context_str_to_sid(struct selinux_state *state,
275 const char *scontext, u32 *out_sid, gfp_t gfp);
276
277 int security_context_to_sid_default(struct selinux_state *state,
278 const char *scontext, u32 scontext_len,
279 u32 *out_sid, u32 def_sid, gfp_t gfp_flags);
280
281 int security_context_to_sid_force(struct selinux_state *state,
282 const char *scontext, u32 scontext_len,
283 u32 *sid);
284
285 int security_get_user_sids(struct selinux_state *state,
286 u32 callsid, char *username,
287 u32 **sids, u32 *nel);
288
289 int security_port_sid(struct selinux_state *state,
290 u8 protocol, u16 port, u32 *out_sid);
291
292 int security_ib_pkey_sid(struct selinux_state *state,
293 u64 subnet_prefix, u16 pkey_num, u32 *out_sid);
294
295 int security_ib_endport_sid(struct selinux_state *state,
296 const char *dev_name, u8 port_num, u32 *out_sid);
297
298 int security_netif_sid(struct selinux_state *state,
299 char *name, u32 *if_sid);
300
301 int security_node_sid(struct selinux_state *state,
302 u16 domain, void *addr, u32 addrlen,
303 u32 *out_sid);
304
305 int security_validate_transition(struct selinux_state *state,
306 u32 oldsid, u32 newsid, u32 tasksid,
307 u16 tclass);
308
309 int security_validate_transition_user(struct selinux_state *state,
310 u32 oldsid, u32 newsid, u32 tasksid,
311 u16 tclass);
312
313 int security_bounded_transition(struct selinux_state *state,
314 u32 oldsid, u32 newsid);
315
316 int security_sid_mls_copy(struct selinux_state *state,
317 u32 sid, u32 mls_sid, u32 *new_sid);
318
319 int security_net_peersid_resolve(struct selinux_state *state,
320 u32 nlbl_sid, u32 nlbl_type,
321 u32 xfrm_sid,
322 u32 *peer_sid);
323
324 int security_get_classes(struct selinux_state *state,
325 char ***classes, int *nclasses);
326 int security_get_permissions(struct selinux_state *state,
327 char *class, char ***perms, int *nperms);
328 int security_get_reject_unknown(struct selinux_state *state);
329 int security_get_allow_unknown(struct selinux_state *state);
330
331 #define SECURITY_FS_USE_XATTR 1 /* use xattr */
332 #define SECURITY_FS_USE_TRANS 2 /* use transition SIDs, e.g. devpts/tmpfs */
333 #define SECURITY_FS_USE_TASK 3 /* use task SIDs, e.g. pipefs/sockfs */
334 #define SECURITY_FS_USE_GENFS 4 /* use the genfs support */
335 #define SECURITY_FS_USE_NONE 5 /* no labeling support */
336 #define SECURITY_FS_USE_MNTPOINT 6 /* use mountpoint labeling */
337 #define SECURITY_FS_USE_NATIVE 7 /* use native label support */
338 #define SECURITY_FS_USE_MAX 7 /* Highest SECURITY_FS_USE_XXX */
339
340 int security_fs_use(struct selinux_state *state, struct super_block *sb);
341
342 int security_genfs_sid(struct selinux_state *state,
343 const char *fstype, char *name, u16 sclass,
344 u32 *sid);
345
346 #ifdef CONFIG_NETLABEL
347 int security_netlbl_secattr_to_sid(struct selinux_state *state,
348 struct netlbl_lsm_secattr *secattr,
349 u32 *sid);
350
351 int security_netlbl_sid_to_secattr(struct selinux_state *state,
352 u32 sid,
353 struct netlbl_lsm_secattr *secattr);
354 #else
security_netlbl_secattr_to_sid(struct selinux_state * state,struct netlbl_lsm_secattr * secattr,u32 * sid)355 static inline int security_netlbl_secattr_to_sid(struct selinux_state *state,
356 struct netlbl_lsm_secattr *secattr,
357 u32 *sid)
358 {
359 return -EIDRM;
360 }
361
security_netlbl_sid_to_secattr(struct selinux_state * state,u32 sid,struct netlbl_lsm_secattr * secattr)362 static inline int security_netlbl_sid_to_secattr(struct selinux_state *state,
363 u32 sid,
364 struct netlbl_lsm_secattr *secattr)
365 {
366 return -ENOENT;
367 }
368 #endif /* CONFIG_NETLABEL */
369
370 const char *security_get_initial_sid_context(u32 sid);
371
372 /*
373 * status notifier using mmap interface
374 */
375 extern struct page *selinux_kernel_status_page(struct selinux_state *state);
376
377 #define SELINUX_KERNEL_STATUS_VERSION 1
378 struct selinux_kernel_status {
379 u32 version; /* version number of thie structure */
380 u32 sequence; /* sequence number of seqlock logic */
381 u32 enforcing; /* current setting of enforcing mode */
382 u32 policyload; /* times of policy reloaded */
383 u32 deny_unknown; /* current setting of deny_unknown */
384 /*
385 * The version > 0 supports above members.
386 */
387 } __packed;
388
389 extern void selinux_status_update_setenforce(struct selinux_state *state,
390 int enforcing);
391 extern void selinux_status_update_policyload(struct selinux_state *state,
392 int seqno);
393 extern void selinux_complete_init(void);
394 extern int selinux_disable(struct selinux_state *state);
395 extern void exit_sel_fs(void);
396 extern struct path selinux_null;
397 extern struct vfsmount *selinuxfs_mount;
398 extern void selnl_notify_setenforce(int val);
399 extern void selnl_notify_policyload(u32 seqno);
400 extern int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm);
401
402 extern void avtab_cache_init(void);
403 extern void ebitmap_cache_init(void);
404 extern void hashtab_cache_init(void);
405 extern void selinux_nlmsg_init(void);
406 extern int security_sidtab_hash_stats(struct selinux_state *state, char *page);
407
408 #endif /* _SELINUX_SECURITY_H_ */
409