1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * Security server interface.
4 *
5 * Author : Stephen Smalley, <stephen.smalley.work@gmail.com>
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/rcupdate.h>
17 #include <linux/refcount.h>
18 #include <linux/workqueue.h>
19 #include <linux/delay.h>
20 #include <linux/printk.h>
21 #include "flask.h"
22 #include "policycap.h"
23
24 #define SECSID_NULL 0x00000000 /* unspecified SID */
25 #define SECSID_WILD 0xffffffff /* wildcard SID */
26 #define SECCLASS_NULL 0x0000 /* no class */
27
28 /* Identify specific policy version changes */
29 #define POLICYDB_VERSION_BASE 15
30 #define POLICYDB_VERSION_BOOL 16
31 #define POLICYDB_VERSION_IPV6 17
32 #define POLICYDB_VERSION_NLCLASS 18
33 #define POLICYDB_VERSION_VALIDATETRANS 19
34 #define POLICYDB_VERSION_MLS 19
35 #define POLICYDB_VERSION_AVTAB 20
36 #define POLICYDB_VERSION_RANGETRANS 21
37 #define POLICYDB_VERSION_POLCAP 22
38 #define POLICYDB_VERSION_PERMISSIVE 23
39 #define POLICYDB_VERSION_BOUNDARY 24
40 #define POLICYDB_VERSION_FILENAME_TRANS 25
41 #define POLICYDB_VERSION_ROLETRANS 26
42 #define POLICYDB_VERSION_NEW_OBJECT_DEFAULTS 27
43 #define POLICYDB_VERSION_DEFAULT_TYPE 28
44 #define POLICYDB_VERSION_CONSTRAINT_NAMES 29
45 #define POLICYDB_VERSION_XPERMS_IOCTL 30
46 #define POLICYDB_VERSION_INFINIBAND 31
47 #define POLICYDB_VERSION_GLBLUB 32
48 #define POLICYDB_VERSION_COMP_FTRANS 33 /* compressed filename transitions */
49 #define POLICYDB_VERSION_COND_XPERMS 34 /* extended permissions in conditional policies */
50
51 /* Range of policy versions we understand*/
52 #define POLICYDB_VERSION_MIN POLICYDB_VERSION_BASE
53 #define POLICYDB_VERSION_MAX POLICYDB_VERSION_COND_XPERMS
54
55 /* Mask for just the mount related flags */
56 #define SE_MNTMASK 0x0f
57 /* Super block security struct flags for mount options */
58 /* BE CAREFUL, these need to be the low order bits for selinux_get_mnt_opts */
59 #define CONTEXT_MNT 0x01
60 #define FSCONTEXT_MNT 0x02
61 #define ROOTCONTEXT_MNT 0x04
62 #define DEFCONTEXT_MNT 0x08
63 #define SBLABEL_MNT 0x10
64 /* Non-mount related flags */
65 #define SE_SBINITIALIZED 0x0100
66 #define SE_SBPROC 0x0200
67 #define SE_SBGENFS 0x0400
68 #define SE_SBGENFS_XATTR 0x0800
69 #define SE_SBNATIVE 0x1000
70
71 #define CONTEXT_STR "context"
72 #define FSCONTEXT_STR "fscontext"
73 #define ROOTCONTEXT_STR "rootcontext"
74 #define DEFCONTEXT_STR "defcontext"
75 #define SECLABEL_STR "seclabel"
76
77 struct netlbl_lsm_secattr;
78
79 extern int selinux_enabled_boot;
80
81 /*
82 * type_datum properties
83 * available at the kernel policy version >= POLICYDB_VERSION_BOUNDARY
84 */
85 #define TYPEDATUM_PROPERTY_PRIMARY 0x0001
86 #define TYPEDATUM_PROPERTY_ATTRIBUTE 0x0002
87
88 /* limitation of boundary depth */
89 #define POLICYDB_BOUNDS_MAXDEPTH 4
90
91 struct selinux_policy;
92
93 struct selinux_state {
94 #ifdef CONFIG_SECURITY_SELINUX_DEVELOP
95 bool enforcing;
96 #endif
97 bool initialized;
98 bool policycap[__POLICYDB_CAP_MAX];
99
100 struct page *status_page;
101 struct mutex status_lock;
102
103 struct selinux_policy __rcu *policy;
104 struct mutex policy_mutex;
105 } __randomize_layout;
106
107 void selinux_avc_init(void);
108
109 extern struct selinux_state selinux_state;
110
selinux_initialized(void)111 static inline bool selinux_initialized(void)
112 {
113 /* do a synchronized load to avoid race conditions */
114 return smp_load_acquire(&selinux_state.initialized);
115 }
116
selinux_mark_initialized(void)117 static inline void selinux_mark_initialized(void)
118 {
119 /* do a synchronized write to avoid race conditions */
120 smp_store_release(&selinux_state.initialized, true);
121 }
122
123 #ifdef CONFIG_SECURITY_SELINUX_DEVELOP
enforcing_enabled(void)124 static inline bool enforcing_enabled(void)
125 {
126 return READ_ONCE(selinux_state.enforcing);
127 }
128
enforcing_set(bool value)129 static inline void enforcing_set(bool value)
130 {
131 WRITE_ONCE(selinux_state.enforcing, value);
132 }
133 #else
enforcing_enabled(void)134 static inline bool enforcing_enabled(void)
135 {
136 return true;
137 }
138
enforcing_set(bool value)139 static inline void enforcing_set(bool value)
140 {
141 }
142 #endif
143
checkreqprot_get(void)144 static inline bool checkreqprot_get(void)
145 {
146 /* non-zero/true checkreqprot values are no longer supported */
147 return 0;
148 }
149
selinux_policycap_netpeer(void)150 static inline bool selinux_policycap_netpeer(void)
151 {
152 return READ_ONCE(selinux_state.policycap[POLICYDB_CAP_NETPEER]);
153 }
154
selinux_policycap_openperm(void)155 static inline bool selinux_policycap_openperm(void)
156 {
157 return READ_ONCE(selinux_state.policycap[POLICYDB_CAP_OPENPERM]);
158 }
159
selinux_policycap_extsockclass(void)160 static inline bool selinux_policycap_extsockclass(void)
161 {
162 return READ_ONCE(selinux_state.policycap[POLICYDB_CAP_EXTSOCKCLASS]);
163 }
164
selinux_policycap_alwaysnetwork(void)165 static inline bool selinux_policycap_alwaysnetwork(void)
166 {
167 return READ_ONCE(selinux_state.policycap[POLICYDB_CAP_ALWAYSNETWORK]);
168 }
169
selinux_policycap_cgroupseclabel(void)170 static inline bool selinux_policycap_cgroupseclabel(void)
171 {
172 return READ_ONCE(selinux_state.policycap[POLICYDB_CAP_CGROUPSECLABEL]);
173 }
174
selinux_policycap_nnp_nosuid_transition(void)175 static inline bool selinux_policycap_nnp_nosuid_transition(void)
176 {
177 return READ_ONCE(
178 selinux_state.policycap[POLICYDB_CAP_NNP_NOSUID_TRANSITION]);
179 }
180
selinux_policycap_genfs_seclabel_symlinks(void)181 static inline bool selinux_policycap_genfs_seclabel_symlinks(void)
182 {
183 return READ_ONCE(
184 selinux_state.policycap[POLICYDB_CAP_GENFS_SECLABEL_SYMLINKS]);
185 }
186
selinux_policycap_ioctl_skip_cloexec(void)187 static inline bool selinux_policycap_ioctl_skip_cloexec(void)
188 {
189 return READ_ONCE(
190 selinux_state.policycap[POLICYDB_CAP_IOCTL_SKIP_CLOEXEC]);
191 }
192
selinux_policycap_userspace_initial_context(void)193 static inline bool selinux_policycap_userspace_initial_context(void)
194 {
195 return READ_ONCE(
196 selinux_state.policycap[POLICYDB_CAP_USERSPACE_INITIAL_CONTEXT]);
197 }
198
selinux_policycap_netlink_xperm(void)199 static inline bool selinux_policycap_netlink_xperm(void)
200 {
201 return READ_ONCE(
202 selinux_state.policycap[POLICYDB_CAP_NETLINK_XPERM]);
203 }
204
selinux_policycap_netif_wildcard(void)205 static inline bool selinux_policycap_netif_wildcard(void)
206 {
207 return READ_ONCE(
208 selinux_state.policycap[POLICYDB_CAP_NETIF_WILDCARD]);
209 }
210
211 struct selinux_policy_convert_data;
212
213 struct selinux_load_state {
214 struct selinux_policy *policy;
215 struct selinux_policy_convert_data *convert_data;
216 };
217
218 int security_mls_enabled(void);
219 int security_load_policy(void *data, size_t len,
220 struct selinux_load_state *load_state);
221 void selinux_policy_commit(struct selinux_load_state *load_state);
222 void selinux_policy_cancel(struct selinux_load_state *load_state);
223 int security_read_policy(void **data, size_t *len);
224 int security_read_state_kernel(void **data, size_t *len);
225 int security_policycap_supported(unsigned int req_cap);
226
227 #define SEL_VEC_MAX 32
228 struct av_decision {
229 u32 allowed;
230 u32 auditallow;
231 u32 auditdeny;
232 u32 seqno;
233 u32 flags;
234 };
235
236 #define XPERMS_ALLOWED 1
237 #define XPERMS_AUDITALLOW 2
238 #define XPERMS_DONTAUDIT 4
239
240 #define security_xperm_set(perms, x) ((perms)[(x) >> 5] |= 1 << ((x)&0x1f))
241 #define security_xperm_test(perms, x) (1 & ((perms)[(x) >> 5] >> ((x)&0x1f)))
242 struct extended_perms_data {
243 u32 p[8];
244 };
245
246 struct extended_perms_decision {
247 u8 used;
248 u8 driver;
249 u8 base_perm;
250 struct extended_perms_data *allowed;
251 struct extended_perms_data *auditallow;
252 struct extended_perms_data *dontaudit;
253 };
254
255 struct extended_perms {
256 u16 len; /* length associated decision chain */
257 u8 base_perms; /* which base permissions are covered */
258 struct extended_perms_data drivers; /* flag drivers that are used */
259 };
260
261 /* definitions of av_decision.flags */
262 #define AVD_FLAGS_PERMISSIVE 0x0001
263
264 void security_compute_av(u32 ssid, u32 tsid, u16 tclass,
265 struct av_decision *avd,
266 struct extended_perms *xperms);
267
268 void security_compute_xperms_decision(u32 ssid, u32 tsid, u16 tclass, u8 driver,
269 u8 base_perm,
270 struct extended_perms_decision *xpermd);
271
272 void security_compute_av_user(u32 ssid, u32 tsid, u16 tclass,
273 struct av_decision *avd);
274
275 int security_transition_sid(u32 ssid, u32 tsid, u16 tclass,
276 const struct qstr *qstr, u32 *out_sid);
277
278 int security_transition_sid_user(u32 ssid, u32 tsid, u16 tclass,
279 const char *objname, u32 *out_sid);
280
281 int security_member_sid(u32 ssid, u32 tsid, u16 tclass, u32 *out_sid);
282
283 int security_change_sid(u32 ssid, u32 tsid, u16 tclass, u32 *out_sid);
284
285 int security_sid_to_context(u32 sid, char **scontext, u32 *scontext_len);
286
287 int security_sid_to_context_force(u32 sid, char **scontext, u32 *scontext_len);
288
289 int security_sid_to_context_inval(u32 sid, char **scontext, u32 *scontext_len);
290
291 int security_context_to_sid(const char *scontext, u32 scontext_len,
292 u32 *out_sid, gfp_t gfp);
293
294 int security_context_str_to_sid(const char *scontext, u32 *out_sid, gfp_t gfp);
295
296 int security_context_to_sid_default(const char *scontext, u32 scontext_len,
297 u32 *out_sid, u32 def_sid, gfp_t gfp_flags);
298
299 int security_context_to_sid_force(const char *scontext, u32 scontext_len,
300 u32 *sid);
301
302 int security_get_user_sids(u32 fromsid, const char *username, u32 **sids, u32 *nel);
303
304 int security_port_sid(u8 protocol, u16 port, u32 *out_sid);
305
306 int security_ib_pkey_sid(u64 subnet_prefix, u16 pkey_num, u32 *out_sid);
307
308 int security_ib_endport_sid(const char *dev_name, u8 port_num, u32 *out_sid);
309
310 int security_netif_sid(const char *name, u32 *if_sid);
311
312 int security_node_sid(u16 domain, void *addr, u32 addrlen, u32 *out_sid);
313
314 int security_validate_transition(u32 oldsid, u32 newsid, u32 tasksid,
315 u16 tclass);
316
317 int security_validate_transition_user(u32 oldsid, u32 newsid, u32 tasksid,
318 u16 tclass);
319
320 int security_bounded_transition(u32 old_sid, u32 new_sid);
321
322 int security_sid_mls_copy(u32 sid, u32 mls_sid, u32 *new_sid);
323
324 int security_net_peersid_resolve(u32 nlbl_sid, u32 nlbl_type, u32 xfrm_sid,
325 u32 *peer_sid);
326
327 int security_get_classes(struct selinux_policy *policy, char ***classes,
328 u32 *nclasses);
329 int security_get_permissions(struct selinux_policy *policy, const char *class,
330 char ***perms, u32 *nperms);
331 int security_get_reject_unknown(void);
332 int security_get_allow_unknown(void);
333
334 #define SECURITY_FS_USE_XATTR 1 /* use xattr */
335 #define SECURITY_FS_USE_TRANS 2 /* use transition SIDs, e.g. devpts/tmpfs */
336 #define SECURITY_FS_USE_TASK 3 /* use task SIDs, e.g. pipefs/sockfs */
337 #define SECURITY_FS_USE_GENFS 4 /* use the genfs support */
338 #define SECURITY_FS_USE_NONE 5 /* no labeling support */
339 #define SECURITY_FS_USE_MNTPOINT 6 /* use mountpoint labeling */
340 #define SECURITY_FS_USE_NATIVE 7 /* use native label support */
341 #define SECURITY_FS_USE_MAX 7 /* Highest SECURITY_FS_USE_XXX */
342
343 int security_fs_use(struct super_block *sb);
344
345 int security_genfs_sid(const char *fstype, const char *path, u16 sclass,
346 u32 *sid);
347
348 int selinux_policy_genfs_sid(struct selinux_policy *policy, const char *fstype,
349 const char *path, u16 sclass, u32 *sid);
350
351 #ifdef CONFIG_NETLABEL
352 int security_netlbl_secattr_to_sid(struct netlbl_lsm_secattr *secattr,
353 u32 *sid);
354
355 int security_netlbl_sid_to_secattr(u32 sid, struct netlbl_lsm_secattr *secattr);
356 #else
357 static inline int
security_netlbl_secattr_to_sid(struct netlbl_lsm_secattr * secattr,u32 * sid)358 security_netlbl_secattr_to_sid(struct netlbl_lsm_secattr *secattr, u32 *sid)
359 {
360 return -EIDRM;
361 }
362
363 static inline int
security_netlbl_sid_to_secattr(u32 sid,struct netlbl_lsm_secattr * secattr)364 security_netlbl_sid_to_secattr(u32 sid, 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(void);
376
377 #define SELINUX_KERNEL_STATUS_VERSION 1
378 struct selinux_kernel_status {
379 u32 version; /* version number of the 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(bool enforcing);
390 extern void selinux_status_update_policyload(u32 seqno);
391 extern void selinux_complete_init(void);
392 extern struct path selinux_null;
393 extern void selnl_notify_setenforce(int val);
394 extern void selnl_notify_policyload(u32 seqno);
395 extern int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm);
396
397 extern void avtab_cache_init(void);
398 extern void ebitmap_cache_init(void);
399 extern void hashtab_cache_init(void);
400 extern int security_sidtab_hash_stats(char *page);
401
402 #endif /* _SELINUX_SECURITY_H_ */
403