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
76struct netlbl_lsm_secattr;
77
78extern 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
90struct selinux_policy;
91
92struct 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
106void selinux_avc_init(void);
107
108extern struct selinux_state selinux_state;
109
110static 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
116static 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
123static inline bool enforcing_enabled(void)
124{
125	return READ_ONCE(selinux_state.enforcing);
126}
127
128static inline void enforcing_set(bool value)
129{
130	WRITE_ONCE(selinux_state.enforcing, value);
131}
132#else
133static inline bool enforcing_enabled(void)
134{
135	return true;
136}
137
138static inline void enforcing_set(bool value)
139{
140}
141#endif
142
143static inline bool checkreqprot_get(void)
144{
145	/* non-zero/true checkreqprot values are no longer supported */
146	return 0;
147}
148
149static inline bool selinux_policycap_netpeer(void)
150{
151	return READ_ONCE(selinux_state.policycap[POLICYDB_CAP_NETPEER]);
152}
153
154static inline bool selinux_policycap_openperm(void)
155{
156	return READ_ONCE(selinux_state.policycap[POLICYDB_CAP_OPENPERM]);
157}
158
159static inline bool selinux_policycap_extsockclass(void)
160{
161	return READ_ONCE(selinux_state.policycap[POLICYDB_CAP_EXTSOCKCLASS]);
162}
163
164static inline bool selinux_policycap_alwaysnetwork(void)
165{
166	return READ_ONCE(selinux_state.policycap[POLICYDB_CAP_ALWAYSNETWORK]);
167}
168
169static inline bool selinux_policycap_cgroupseclabel(void)
170{
171	return READ_ONCE(selinux_state.policycap[POLICYDB_CAP_CGROUPSECLABEL]);
172}
173
174static inline bool selinux_policycap_nnp_nosuid_transition(void)
175{
176	return READ_ONCE(
177		selinux_state.policycap[POLICYDB_CAP_NNP_NOSUID_TRANSITION]);
178}
179
180static inline bool selinux_policycap_genfs_seclabel_symlinks(void)
181{
182	return READ_ONCE(
183		selinux_state.policycap[POLICYDB_CAP_GENFS_SECLABEL_SYMLINKS]);
184}
185
186static inline bool selinux_policycap_ioctl_skip_cloexec(void)
187{
188	return READ_ONCE(
189		selinux_state.policycap[POLICYDB_CAP_IOCTL_SKIP_CLOEXEC]);
190}
191
192static inline bool selinux_policycap_userspace_initial_context(void)
193{
194	return READ_ONCE(
195		selinux_state.policycap[POLICYDB_CAP_USERSPACE_INITIAL_CONTEXT]);
196}
197
198struct selinux_policy_convert_data;
199
200struct selinux_load_state {
201	struct selinux_policy *policy;
202	struct selinux_policy_convert_data *convert_data;
203};
204
205int security_mls_enabled(void);
206int security_load_policy(void *data, size_t len,
207			 struct selinux_load_state *load_state);
208void selinux_policy_commit(struct selinux_load_state *load_state);
209void selinux_policy_cancel(struct selinux_load_state *load_state);
210int security_read_policy(void **data, size_t *len);
211int security_read_state_kernel(void **data, size_t *len);
212int security_policycap_supported(unsigned int req_cap);
213
214#define SEL_VEC_MAX 32
215struct 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)))
229struct extended_perms_data {
230	u32 p[8];
231};
232
233struct 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
241struct 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
249void security_compute_av(u32 ssid, u32 tsid, u16 tclass,
250			 struct av_decision *avd,
251			 struct extended_perms *xperms);
252
253void security_compute_xperms_decision(u32 ssid, u32 tsid, u16 tclass, u8 driver,
254				      struct extended_perms_decision *xpermd);
255
256void security_compute_av_user(u32 ssid, u32 tsid, u16 tclass,
257			      struct av_decision *avd);
258
259int security_transition_sid(u32 ssid, u32 tsid, u16 tclass,
260			    const struct qstr *qstr, u32 *out_sid);
261
262int security_transition_sid_user(u32 ssid, u32 tsid, u16 tclass,
263				 const char *objname, u32 *out_sid);
264
265int security_member_sid(u32 ssid, u32 tsid, u16 tclass, u32 *out_sid);
266
267int security_change_sid(u32 ssid, u32 tsid, u16 tclass, u32 *out_sid);
268
269int security_sid_to_context(u32 sid, char **scontext, u32 *scontext_len);
270
271int security_sid_to_context_force(u32 sid, char **scontext, u32 *scontext_len);
272
273int security_sid_to_context_inval(u32 sid, char **scontext, u32 *scontext_len);
274
275int security_context_to_sid(const char *scontext, u32 scontext_len,
276			    u32 *out_sid, gfp_t gfp);
277
278int security_context_str_to_sid(const char *scontext, u32 *out_sid, gfp_t gfp);
279
280int security_context_to_sid_default(const char *scontext, u32 scontext_len,
281				    u32 *out_sid, u32 def_sid, gfp_t gfp_flags);
282
283int security_context_to_sid_force(const char *scontext, u32 scontext_len,
284				  u32 *sid);
285
286int security_get_user_sids(u32 callsid, char *username, u32 **sids, u32 *nel);
287
288int security_port_sid(u8 protocol, u16 port, u32 *out_sid);
289
290int security_ib_pkey_sid(u64 subnet_prefix, u16 pkey_num, u32 *out_sid);
291
292int security_ib_endport_sid(const char *dev_name, u8 port_num, u32 *out_sid);
293
294int security_netif_sid(char *name, u32 *if_sid);
295
296int security_node_sid(u16 domain, void *addr, u32 addrlen, u32 *out_sid);
297
298int security_validate_transition(u32 oldsid, u32 newsid, u32 tasksid,
299				 u16 tclass);
300
301int security_validate_transition_user(u32 oldsid, u32 newsid, u32 tasksid,
302				      u16 tclass);
303
304int security_bounded_transition(u32 oldsid, u32 newsid);
305
306int security_sid_mls_copy(u32 sid, u32 mls_sid, u32 *new_sid);
307
308int security_net_peersid_resolve(u32 nlbl_sid, u32 nlbl_type, u32 xfrm_sid,
309				 u32 *peer_sid);
310
311int security_get_classes(struct selinux_policy *policy, char ***classes,
312			 u32 *nclasses);
313int security_get_permissions(struct selinux_policy *policy, const char *class,
314			     char ***perms, u32 *nperms);
315int security_get_reject_unknown(void);
316int 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
327int security_fs_use(struct super_block *sb);
328
329int security_genfs_sid(const char *fstype, const char *path, u16 sclass,
330		       u32 *sid);
331
332int selinux_policy_genfs_sid(struct selinux_policy *policy, const char *fstype,
333			     const char *path, u16 sclass, u32 *sid);
334
335#ifdef CONFIG_NETLABEL
336int security_netlbl_secattr_to_sid(struct netlbl_lsm_secattr *secattr,
337				   u32 *sid);
338
339int security_netlbl_sid_to_secattr(u32 sid, struct netlbl_lsm_secattr *secattr);
340#else
341static inline int
342security_netlbl_secattr_to_sid(struct netlbl_lsm_secattr *secattr, u32 *sid)
343{
344	return -EIDRM;
345}
346
347static inline int
348security_netlbl_sid_to_secattr(u32 sid, struct netlbl_lsm_secattr *secattr)
349{
350	return -ENOENT;
351}
352#endif /* CONFIG_NETLABEL */
353
354const char *security_get_initial_sid_context(u32 sid);
355
356/*
357 * status notifier using mmap interface
358 */
359extern struct page *selinux_kernel_status_page(void);
360
361#define SELINUX_KERNEL_STATUS_VERSION 1
362struct 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
373extern void selinux_status_update_setenforce(bool enforcing);
374extern void selinux_status_update_policyload(u32 seqno);
375extern void selinux_complete_init(void);
376extern struct path selinux_null;
377extern void selnl_notify_setenforce(int val);
378extern void selnl_notify_policyload(u32 seqno);
379extern int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm);
380
381extern void avtab_cache_init(void);
382extern void ebitmap_cache_init(void);
383extern void hashtab_cache_init(void);
384extern int security_sidtab_hash_stats(char *page);
385
386#endif /* _SELINUX_SECURITY_H_ */
387