security.h revision f50a3ec961f90e38c0311411179d5dfee1412192 
1/*
2 * Security server interface.
3 *
4 * Author : Stephen Smalley, <sds@epoch.ncsc.mil>
5 *
6 */
7
8#ifndef _SELINUX_SECURITY_H_
9#define _SELINUX_SECURITY_H_
10
11#include <linux/dcache.h>
12#include <linux/magic.h>
13#include <linux/types.h>
14#include "flask.h"
15
16#define SECSID_NULL			0x00000000 /* unspecified SID */
17#define SECSID_WILD			0xffffffff /* wildcard SID */
18#define SECCLASS_NULL			0x0000 /* no class */
19
20/* Identify specific policy version changes */
21#define POLICYDB_VERSION_BASE		15
22#define POLICYDB_VERSION_BOOL		16
23#define POLICYDB_VERSION_IPV6		17
24#define POLICYDB_VERSION_NLCLASS	18
25#define POLICYDB_VERSION_VALIDATETRANS	19
26#define POLICYDB_VERSION_MLS		19
27#define POLICYDB_VERSION_AVTAB		20
28#define POLICYDB_VERSION_RANGETRANS	21
29#define POLICYDB_VERSION_POLCAP		22
30#define POLICYDB_VERSION_PERMISSIVE	23
31#define POLICYDB_VERSION_BOUNDARY	24
32#define POLICYDB_VERSION_FILENAME_TRANS	25
33#define POLICYDB_VERSION_ROLETRANS	26
34
35/* Range of policy versions we understand*/
36#define POLICYDB_VERSION_MIN   POLICYDB_VERSION_BASE
37#ifdef CONFIG_SECURITY_SELINUX_POLICYDB_VERSION_MAX
38#define POLICYDB_VERSION_MAX	CONFIG_SECURITY_SELINUX_POLICYDB_VERSION_MAX_VALUE
39#else
40#define POLICYDB_VERSION_MAX	POLICYDB_VERSION_ROLETRANS
41#endif
42
43/* Mask for just the mount related flags */
44#define SE_MNTMASK	0x0f
45/* Super block security struct flags for mount options */
46#define CONTEXT_MNT	0x01
47#define FSCONTEXT_MNT	0x02
48#define ROOTCONTEXT_MNT	0x04
49#define DEFCONTEXT_MNT	0x08
50/* Non-mount related flags */
51#define SE_SBINITIALIZED	0x10
52#define SE_SBPROC		0x20
53#define SE_SBLABELSUPP	0x40
54
55#define CONTEXT_STR	"context="
56#define FSCONTEXT_STR	"fscontext="
57#define ROOTCONTEXT_STR	"rootcontext="
58#define DEFCONTEXT_STR	"defcontext="
59#define LABELSUPP_STR "seclabel"
60
61struct netlbl_lsm_secattr;
62
63extern int selinux_enabled;
64
65/* Policy capabilities */
66enum {
67	POLICYDB_CAPABILITY_NETPEER,
68	POLICYDB_CAPABILITY_OPENPERM,
69	__POLICYDB_CAPABILITY_MAX
70};
71#define POLICYDB_CAPABILITY_MAX (__POLICYDB_CAPABILITY_MAX - 1)
72
73extern int selinux_policycap_netpeer;
74extern int selinux_policycap_openperm;
75
76/*
77 * type_datum properties
78 * available at the kernel policy version >= POLICYDB_VERSION_BOUNDARY
79 */
80#define TYPEDATUM_PROPERTY_PRIMARY	0x0001
81#define TYPEDATUM_PROPERTY_ATTRIBUTE	0x0002
82
83/* limitation of boundary depth  */
84#define POLICYDB_BOUNDS_MAXDEPTH	4
85
86int security_mls_enabled(void);
87
88int security_load_policy(void *data, size_t len);
89int security_read_policy(void **data, ssize_t *len);
90size_t security_policydb_len(void);
91
92int security_policycap_supported(unsigned int req_cap);
93
94#define SEL_VEC_MAX 32
95struct av_decision {
96	u32 allowed;
97	u32 auditallow;
98	u32 auditdeny;
99	u32 seqno;
100	u32 flags;
101};
102
103/* definitions of av_decision.flags */
104#define AVD_FLAGS_PERMISSIVE	0x0001
105
106void security_compute_av(u32 ssid, u32 tsid,
107			 u16 tclass, struct av_decision *avd);
108
109void security_compute_av_user(u32 ssid, u32 tsid,
110			     u16 tclass, struct av_decision *avd);
111
112int security_transition_sid(u32 ssid, u32 tsid, u16 tclass,
113			    const struct qstr *qstr, u32 *out_sid);
114
115int security_transition_sid_user(u32 ssid, u32 tsid, u16 tclass,
116				 const char *objname, u32 *out_sid);
117
118int security_member_sid(u32 ssid, u32 tsid,
119	u16 tclass, u32 *out_sid);
120
121int security_change_sid(u32 ssid, u32 tsid,
122	u16 tclass, u32 *out_sid);
123
124int security_sid_to_context(u32 sid, char **scontext,
125	u32 *scontext_len);
126
127int security_sid_to_context_force(u32 sid, char **scontext, u32 *scontext_len);
128
129int security_context_to_sid(const char *scontext, u32 scontext_len,
130	u32 *out_sid);
131
132int security_context_to_sid_default(const char *scontext, u32 scontext_len,
133				    u32 *out_sid, u32 def_sid, gfp_t gfp_flags);
134
135int security_context_to_sid_force(const char *scontext, u32 scontext_len,
136				  u32 *sid);
137
138int security_get_user_sids(u32 callsid, char *username,
139			   u32 **sids, u32 *nel);
140
141int security_port_sid(u8 protocol, u16 port, u32 *out_sid);
142
143int security_netif_sid(char *name, u32 *if_sid);
144
145int security_node_sid(u16 domain, void *addr, u32 addrlen,
146	u32 *out_sid);
147
148int security_validate_transition(u32 oldsid, u32 newsid, u32 tasksid,
149				 u16 tclass);
150
151int security_bounded_transition(u32 oldsid, u32 newsid);
152
153int security_sid_mls_copy(u32 sid, u32 mls_sid, u32 *new_sid);
154
155int security_net_peersid_resolve(u32 nlbl_sid, u32 nlbl_type,
156				 u32 xfrm_sid,
157				 u32 *peer_sid);
158
159int security_get_classes(char ***classes, int *nclasses);
160int security_get_permissions(char *class, char ***perms, int *nperms);
161int security_get_reject_unknown(void);
162int security_get_allow_unknown(void);
163
164#define SECURITY_FS_USE_XATTR		1 /* use xattr */
165#define SECURITY_FS_USE_TRANS		2 /* use transition SIDs, e.g. devpts/tmpfs */
166#define SECURITY_FS_USE_TASK		3 /* use task SIDs, e.g. pipefs/sockfs */
167#define SECURITY_FS_USE_GENFS		4 /* use the genfs support */
168#define SECURITY_FS_USE_NONE		5 /* no labeling support */
169#define SECURITY_FS_USE_MNTPOINT	6 /* use mountpoint labeling */
170
171int security_fs_use(const char *fstype, unsigned int *behavior,
172	u32 *sid);
173
174int security_genfs_sid(const char *fstype, char *name, u16 sclass,
175	u32 *sid);
176
177#ifdef CONFIG_NETLABEL
178int security_netlbl_secattr_to_sid(struct netlbl_lsm_secattr *secattr,
179				   u32 *sid);
180
181int security_netlbl_sid_to_secattr(u32 sid,
182				   struct netlbl_lsm_secattr *secattr);
183#else
184static inline int security_netlbl_secattr_to_sid(
185					    struct netlbl_lsm_secattr *secattr,
186					    u32 *sid)
187{
188	return -EIDRM;
189}
190
191static inline int security_netlbl_sid_to_secattr(u32 sid,
192					   struct netlbl_lsm_secattr *secattr)
193{
194	return -ENOENT;
195}
196#endif /* CONFIG_NETLABEL */
197
198const char *security_get_initial_sid_context(u32 sid);
199
200/*
201 * status notifier using mmap interface
202 */
203extern struct page *selinux_kernel_status_page(void);
204
205#define SELINUX_KERNEL_STATUS_VERSION	1
206struct selinux_kernel_status {
207	u32	version;	/* version number of thie structure */
208	u32	sequence;	/* sequence number of seqlock logic */
209	u32	enforcing;	/* current setting of enforcing mode */
210	u32	policyload;	/* times of policy reloaded */
211	u32	deny_unknown;	/* current setting of deny_unknown */
212	/*
213	 * The version > 0 supports above members.
214	 */
215} __attribute__((packed));
216
217extern void selinux_status_update_setenforce(int enforcing);
218extern void selinux_status_update_policyload(int seqno);
219
220#endif /* _SELINUX_SECURITY_H_ */
221
222