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