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
50 /* Range of policy versions we understand*/
51 #define POLICYDB_VERSION_MIN POLICYDB_VERSION_BASE
52 #define POLICYDB_VERSION_MAX POLICYDB_VERSION_COMP_FTRANS
53
54 /* Mask for just the mount related flags */
55 #define SE_MNTMASK 0x0f
56 /* Super block security struct flags for mount options */
57 /* BE CAREFUL, these need to be the low order bits for selinux_get_mnt_opts */
58 #define CONTEXT_MNT 0x01
59 #define FSCONTEXT_MNT 0x02
60 #define ROOTCONTEXT_MNT 0x04
61 #define DEFCONTEXT_MNT 0x08
62 #define SBLABEL_MNT 0x10
63 /* Non-mount related flags */
64 #define SE_SBINITIALIZED 0x0100
65 #define SE_SBPROC 0x0200
66 #define SE_SBGENFS 0x0400
67 #define SE_SBGENFS_XATTR 0x0800
68 #define SE_SBNATIVE 0x1000
69
70 #define CONTEXT_STR "context"
71 #define FSCONTEXT_STR "fscontext"
72 #define ROOTCONTEXT_STR "rootcontext"
73 #define DEFCONTEXT_STR "defcontext"
74 #define SECLABEL_STR "seclabel"
75
76 struct netlbl_lsm_secattr;
77
78 extern int selinux_enabled_boot;
79
80 /*
81 * type_datum properties
82 * available at the kernel policy version >= POLICYDB_VERSION_BOUNDARY
83 */
84 #define TYPEDATUM_PROPERTY_PRIMARY 0x0001
85 #define TYPEDATUM_PROPERTY_ATTRIBUTE 0x0002
86
87 /* limitation of boundary depth */
88 #define POLICYDB_BOUNDS_MAXDEPTH 4
89
90 struct selinux_policy;
91
92 struct selinux_state {
93 #ifdef CONFIG_SECURITY_SELINUX_DEVELOP
94 bool enforcing;
95 #endif
96 bool initialized;
97 bool policycap[__POLICYDB_CAP_MAX];
98
99 struct page *status_page;
100 struct mutex status_lock;
101
102 struct selinux_policy __rcu *policy;
103 struct mutex policy_mutex;
104 } __randomize_layout;
105
106 void selinux_avc_init(void);
107
108 extern struct selinux_state selinux_state;
109
110 static inline bool selinux_initialized(void)
111 {
112 /* do a synchronized load to avoid race conditions */
113 return smp_load_acquire(&selinux_state.initialized);
114 }
115
116 static inline void selinux_mark_initialized(void)
117 {
118 /* do a synchronized write to avoid race conditions */
119 smp_store_release(&selinux_state.initialized, true);
120 }
121
122 #ifdef CONFIG_SECURITY_SELINUX_DEVELOP
123 static inline bool enforcing_enabled(void)
124 {
125 return READ_ONCE(selinux_state.enforcing);
126 }
127
128 static inline void enforcing_set(bool value)
129 {
130 WRITE_ONCE(selinux_state.enforcing, value);
131 }
132 #else
133 static inline bool enforcing_enabled(void)
134 {
135 return true;
136 }
137
138 static inline void enforcing_set(bool value)
139 {
140 }
141 #endif
142
143 static inline bool checkreqprot_get(void)
144 {
145 /* non-zero/true checkreqprot values are no longer supported */
146 return 0;
147 }
148
149 static inline bool selinux_policycap_netpeer(void)
150 {
151 return READ_ONCE(selinux_state.policycap[POLICYDB_CAP_NETPEER]);
152 }
153
154 static inline bool selinux_policycap_openperm(void)
155 {
156 return READ_ONCE(selinux_state.policycap[POLICYDB_CAP_OPENPERM]);
157 }
158
159 static inline bool selinux_policycap_extsockclass(void)
160 {
161 return READ_ONCE(selinux_state.policycap[POLICYDB_CAP_EXTSOCKCLASS]);
162 }
163
164 static inline bool selinux_policycap_alwaysnetwork(void)
165 {
166 return READ_ONCE(selinux_state.policycap[POLICYDB_CAP_ALWAYSNETWORK]);
167 }
168
169 static inline bool selinux_policycap_cgroupseclabel(void)
170 {
171 return READ_ONCE(selinux_state.policycap[POLICYDB_CAP_CGROUPSECLABEL]);
172 }
173
174 static inline bool selinux_policycap_nnp_nosuid_transition(void)
175 {
176 return READ_ONCE(
177 selinux_state.policycap[POLICYDB_CAP_NNP_NOSUID_TRANSITION]);
178 }
179
180 static inline bool selinux_policycap_genfs_seclabel_symlinks(void)
181 {
182 return READ_ONCE(
183 selinux_state.policycap[POLICYDB_CAP_GENFS_SECLABEL_SYMLINKS]);
184 }
185
186 static inline bool selinux_policycap_ioctl_skip_cloexec(void)
187 {
188 return READ_ONCE(
189 selinux_state.policycap[POLICYDB_CAP_IOCTL_SKIP_CLOEXEC]);
190 }
191
192 static inline bool selinux_policycap_userspace_initial_context(void)
193 {
194 return READ_ONCE(
195 selinux_state.policycap[POLICYDB_CAP_USERSPACE_INITIAL_CONTEXT]);
196 }
197
198 struct selinux_policy_convert_data;
199
200 struct selinux_load_state {
201 struct selinux_policy *policy;
202 struct selinux_policy_convert_data *convert_data;
203 };
204
205 int security_mls_enabled(void);
206 int security_load_policy(void *data, size_t len,
207 struct selinux_load_state *load_state);
208 void selinux_policy_commit(struct selinux_load_state *load_state);
209 void selinux_policy_cancel(struct selinux_load_state *load_state);
210 int security_read_policy(void **data, size_t *len);
211 int security_read_state_kernel(void **data, size_t *len);
212 int security_policycap_supported(unsigned int req_cap);
213
214 #define SEL_VEC_MAX 32
215 struct av_decision {
216 u32 allowed;
217 u32 auditallow;
218 u32 auditdeny;
219 u32 seqno;
220 u32 flags;
221 };
222
223 #define XPERMS_ALLOWED 1
224 #define XPERMS_AUDITALLOW 2
225 #define XPERMS_DONTAUDIT 4
226
227 #define security_xperm_set(perms, x) ((perms)[(x) >> 5] |= 1 << ((x)&0x1f))
228 #define security_xperm_test(perms, x) (1 & ((perms)[(x) >> 5] >> ((x)&0x1f)))
229 struct extended_perms_data {
230 u32 p[8];
231 };
232
233 struct extended_perms_decision {
234 u8 used;
235 u8 driver;
236 struct extended_perms_data *allowed;
237 struct extended_perms_data *auditallow;
238 struct extended_perms_data *dontaudit;
239 };
240
241 struct extended_perms {
242 u16 len; /* length associated decision chain */
243 struct extended_perms_data drivers; /* flag drivers that are used */
244 };
245
246 /* definitions of av_decision.flags */
247 #define AVD_FLAGS_PERMISSIVE 0x0001
248
249 void security_compute_av(u32 ssid, u32 tsid, u16 tclass,
250 struct av_decision *avd,
251 struct extended_perms *xperms);
252
253 void security_compute_xperms_decision(u32 ssid, u32 tsid, u16 tclass, u8 driver,
254 struct extended_perms_decision *xpermd);
255
256 void security_compute_av_user(u32 ssid, u32 tsid, u16 tclass,
257 struct av_decision *avd);
258
259 int security_transition_sid(u32 ssid, u32 tsid, u16 tclass,
260 const struct qstr *qstr, u32 *out_sid);
261
262 int security_transition_sid_user(u32 ssid, u32 tsid, u16 tclass,
263 const char *objname, u32 *out_sid);
264
265 int security_member_sid(u32 ssid, u32 tsid, u16 tclass, u32 *out_sid);
266
267 int security_change_sid(u32 ssid, u32 tsid, u16 tclass, u32 *out_sid);
268
269 int security_sid_to_context(u32 sid, char **scontext, u32 *scontext_len);
270
271 int security_sid_to_context_force(u32 sid, char **scontext, u32 *scontext_len);
272
273 int security_sid_to_context_inval(u32 sid, char **scontext, u32 *scontext_len);
274
275 int security_context_to_sid(const char *scontext, u32 scontext_len,
276 u32 *out_sid, gfp_t gfp);
277
278 int security_context_str_to_sid(const char *scontext, u32 *out_sid, gfp_t gfp);
279
280 int security_context_to_sid_default(const char *scontext, u32 scontext_len,
281 u32 *out_sid, u32 def_sid, gfp_t gfp_flags);
282
283 int security_context_to_sid_force(const char *scontext, u32 scontext_len,
284 u32 *sid);
285
286 int security_get_user_sids(u32 callsid, char *username, u32 **sids, u32 *nel);
287
288 int security_port_sid(u8 protocol, u16 port, u32 *out_sid);
289
290 int security_ib_pkey_sid(u64 subnet_prefix, u16 pkey_num, u32 *out_sid);
291
292 int security_ib_endport_sid(const char *dev_name, u8 port_num, u32 *out_sid);
293
294 int security_netif_sid(char *name, u32 *if_sid);
295
296 int security_node_sid(u16 domain, void *addr, u32 addrlen, u32 *out_sid);
297
298 int security_validate_transition(u32 oldsid, u32 newsid, u32 tasksid,
299 u16 tclass);
300
301 int security_validate_transition_user(u32 oldsid, u32 newsid, u32 tasksid,
302 u16 tclass);
303
304 int security_bounded_transition(u32 oldsid, u32 newsid);
305
306 int security_sid_mls_copy(u32 sid, u32 mls_sid, u32 *new_sid);
307
308 int security_net_peersid_resolve(u32 nlbl_sid, u32 nlbl_type, u32 xfrm_sid,
309 u32 *peer_sid);
310
311 int security_get_classes(struct selinux_policy *policy, char ***classes,
312 u32 *nclasses);
313 int security_get_permissions(struct selinux_policy *policy, const char *class,
314 char ***perms, u32 *nperms);
315 int security_get_reject_unknown(void);
316 int security_get_allow_unknown(void);
317
318 #define SECURITY_FS_USE_XATTR 1 /* use xattr */
319 #define SECURITY_FS_USE_TRANS 2 /* use transition SIDs, e.g. devpts/tmpfs */
320 #define SECURITY_FS_USE_TASK 3 /* use task SIDs, e.g. pipefs/sockfs */
321 #define SECURITY_FS_USE_GENFS 4 /* use the genfs support */
322 #define SECURITY_FS_USE_NONE 5 /* no labeling support */
323 #define SECURITY_FS_USE_MNTPOINT 6 /* use mountpoint labeling */
324 #define SECURITY_FS_USE_NATIVE 7 /* use native label support */
325 #define SECURITY_FS_USE_MAX 7 /* Highest SECURITY_FS_USE_XXX */
326
327 int security_fs_use(struct super_block *sb);
328
329 int security_genfs_sid(const char *fstype, const char *path, u16 sclass,
330 u32 *sid);
331
332 int selinux_policy_genfs_sid(struct selinux_policy *policy, const char *fstype,
333 const char *path, u16 sclass, u32 *sid);
334
335 #ifdef CONFIG_NETLABEL
336 int security_netlbl_secattr_to_sid(struct netlbl_lsm_secattr *secattr,
337 u32 *sid);
338
339 int security_netlbl_sid_to_secattr(u32 sid, struct netlbl_lsm_secattr *secattr);
340 #else
341 static inline int
342 security_netlbl_secattr_to_sid(struct netlbl_lsm_secattr *secattr, u32 *sid)
343 {
344 return -EIDRM;
345 }
346
347 static inline int
348 security_netlbl_sid_to_secattr(u32 sid, struct netlbl_lsm_secattr *secattr)
349 {
350 return -ENOENT;
351 }
352 #endif /* CONFIG_NETLABEL */
353
354 const char *security_get_initial_sid_context(u32 sid);
355
356 /*
357 * status notifier using mmap interface
358 */
359 extern struct page *selinux_kernel_status_page(void);
360
361 #define SELINUX_KERNEL_STATUS_VERSION 1
362 struct selinux_kernel_status {
363 u32 version; /* version number of the structure */
364 u32 sequence; /* sequence number of seqlock logic */
365 u32 enforcing; /* current setting of enforcing mode */
366 u32 policyload; /* times of policy reloaded */
367 u32 deny_unknown; /* current setting of deny_unknown */
368 /*
369 * The version > 0 supports above members.
370 */
371 } __packed;
372
373 extern void selinux_status_update_setenforce(bool enforcing);
374 extern void selinux_status_update_policyload(u32 seqno);
375 extern void selinux_complete_init(void);
376 extern struct path selinux_null;
377 extern void selnl_notify_setenforce(int val);
378 extern void selnl_notify_policyload(u32 seqno);
379 extern int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm);
380
381 extern void avtab_cache_init(void);
382 extern void ebitmap_cache_init(void);
383 extern void hashtab_cache_init(void);
384 extern int security_sidtab_hash_stats(char *page);
385
386 #endif /* _SELINUX_SECURITY_H_ */
387
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