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