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
192struct selinux_policy_convert_data;
193
194struct selinux_load_state {
195	struct selinux_policy *policy;
196	struct selinux_policy_convert_data *convert_data;
197};
198
199int security_mls_enabled(void);
200int security_load_policy(void *data, size_t len,
201			 struct selinux_load_state *load_state);
202void selinux_policy_commit(struct selinux_load_state *load_state);
203void selinux_policy_cancel(struct selinux_load_state *load_state);
204int security_read_policy(void **data, size_t *len);
205int security_read_state_kernel(void **data, size_t *len);
206int security_policycap_supported(unsigned int req_cap);
207
208#define SEL_VEC_MAX 32
209struct 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)))
223struct extended_perms_data {
224	u32 p[8];
225};
226
227struct 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
235struct 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
243void security_compute_av(u32 ssid, u32 tsid,
244			 u16 tclass, struct av_decision *avd,
245			 struct extended_perms *xperms);
246
247void security_compute_xperms_decision(u32 ssid, u32 tsid, u16 tclass,
248				      u8 driver,
249				      struct extended_perms_decision *xpermd);
250
251void security_compute_av_user(u32 ssid, u32 tsid,
252			      u16 tclass, struct av_decision *avd);
253
254int security_transition_sid(u32 ssid, u32 tsid, u16 tclass,
255			    const struct qstr *qstr, u32 *out_sid);
256
257int security_transition_sid_user(u32 ssid, u32 tsid, u16 tclass,
258				 const char *objname, u32 *out_sid);
259
260int security_member_sid(u32 ssid, u32 tsid, u16 tclass, u32 *out_sid);
261
262int security_change_sid(u32 ssid, u32 tsid, u16 tclass, u32 *out_sid);
263
264int security_sid_to_context(u32 sid, char **scontext, u32 *scontext_len);
265
266int security_sid_to_context_force(u32 sid, char **scontext, u32 *scontext_len);
267
268int security_sid_to_context_inval(u32 sid, char **scontext, u32 *scontext_len);
269
270int security_context_to_sid(const char *scontext, u32 scontext_len,
271			    u32 *out_sid, gfp_t gfp);
272
273int security_context_str_to_sid(const char *scontext, u32 *out_sid, gfp_t gfp);
274
275int security_context_to_sid_default(const char *scontext, u32 scontext_len,
276				    u32 *out_sid, u32 def_sid, gfp_t gfp_flags);
277
278int security_context_to_sid_force(const char *scontext, u32 scontext_len,
279				  u32 *sid);
280
281int security_get_user_sids(u32 callsid, char *username, u32 **sids, u32 *nel);
282
283int security_port_sid(u8 protocol, u16 port, u32 *out_sid);
284
285int security_ib_pkey_sid(u64 subnet_prefix, u16 pkey_num, u32 *out_sid);
286
287int security_ib_endport_sid(const char *dev_name, u8 port_num, u32 *out_sid);
288
289int security_netif_sid(char *name, u32 *if_sid);
290
291int security_node_sid(u16 domain, void *addr, u32 addrlen,
292		      u32 *out_sid);
293
294int security_validate_transition(u32 oldsid, u32 newsid, u32 tasksid,
295				 u16 tclass);
296
297int security_validate_transition_user(u32 oldsid, u32 newsid, u32 tasksid,
298				      u16 tclass);
299
300int security_bounded_transition(u32 oldsid, u32 newsid);
301
302int security_sid_mls_copy(u32 sid, u32 mls_sid, u32 *new_sid);
303
304int security_net_peersid_resolve(u32 nlbl_sid, u32 nlbl_type,
305				 u32 xfrm_sid,
306				 u32 *peer_sid);
307
308int security_get_classes(struct selinux_policy *policy,
309			 char ***classes, u32 *nclasses);
310int security_get_permissions(struct selinux_policy *policy,
311			     const char *class, char ***perms, u32 *nperms);
312int security_get_reject_unknown(void);
313int 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
324int security_fs_use(struct super_block *sb);
325
326int security_genfs_sid(const char *fstype, const char *path, u16 sclass,
327		       u32 *sid);
328
329int 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
334int security_netlbl_secattr_to_sid(struct netlbl_lsm_secattr *secattr,
335				   u32 *sid);
336
337int security_netlbl_sid_to_secattr(u32 sid,
338				   struct netlbl_lsm_secattr *secattr);
339#else
340static inline int security_netlbl_secattr_to_sid(struct netlbl_lsm_secattr *secattr,
341					    u32 *sid)
342{
343	return -EIDRM;
344}
345
346static 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
353const char *security_get_initial_sid_context(u32 sid);
354
355/*
356 * status notifier using mmap interface
357 */
358extern struct page *selinux_kernel_status_page(void);
359
360#define SELINUX_KERNEL_STATUS_VERSION	1
361struct 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
372extern void selinux_status_update_setenforce(bool enforcing);
373extern void selinux_status_update_policyload(u32 seqno);
374extern void selinux_complete_init(void);
375extern struct path selinux_null;
376extern void selnl_notify_setenforce(int val);
377extern void selnl_notify_policyload(u32 seqno);
378extern int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm);
379
380extern void avtab_cache_init(void);
381extern void ebitmap_cache_init(void);
382extern void hashtab_cache_init(void);
383extern int security_sidtab_hash_stats(char *page);
384
385#endif /* _SELINUX_SECURITY_H_ */
386