avc.h revision d9250dea3f89fe808a525f08888016b495240ed4 
1/*
2 * Access vector cache interface for object managers.
3 *
4 * Author : Stephen Smalley, <sds@epoch.ncsc.mil>
5 */
6#ifndef _SELINUX_AVC_H_
7#define _SELINUX_AVC_H_
8
9#include <linux/stddef.h>
10#include <linux/errno.h>
11#include <linux/kernel.h>
12#include <linux/kdev_t.h>
13#include <linux/spinlock.h>
14#include <linux/init.h>
15#include <linux/audit.h>
16#include <linux/in6.h>
17#include <linux/path.h>
18#include <asm/system.h>
19#include "flask.h"
20#include "av_permissions.h"
21#include "security.h"
22
23#ifdef CONFIG_SECURITY_SELINUX_DEVELOP
24extern int selinux_enforcing;
25#else
26#define selinux_enforcing 1
27#endif
28
29/*
30 * An entry in the AVC.
31 */
32struct avc_entry;
33
34struct task_struct;
35struct inode;
36struct sock;
37struct sk_buff;
38
39/* Auxiliary data to use in generating the audit record. */
40struct avc_audit_data {
41	char    type;
42#define AVC_AUDIT_DATA_FS   1
43#define AVC_AUDIT_DATA_NET  2
44#define AVC_AUDIT_DATA_CAP  3
45#define AVC_AUDIT_DATA_IPC  4
46	struct task_struct *tsk;
47	union 	{
48		struct {
49			struct path path;
50			struct inode *inode;
51		} fs;
52		struct {
53			int netif;
54			struct sock *sk;
55			u16 family;
56			__be16 dport;
57			__be16 sport;
58			union {
59				struct {
60					__be32 daddr;
61					__be32 saddr;
62				} v4;
63				struct {
64					struct in6_addr daddr;
65					struct in6_addr saddr;
66				} v6;
67			} fam;
68		} net;
69		int cap;
70		int ipc_id;
71	} u;
72};
73
74#define v4info fam.v4
75#define v6info fam.v6
76
77/* Initialize an AVC audit data structure. */
78#define AVC_AUDIT_DATA_INIT(_d,_t) \
79	{ memset((_d), 0, sizeof(struct avc_audit_data)); (_d)->type = AVC_AUDIT_DATA_##_t; }
80
81/*
82 * AVC statistics
83 */
84struct avc_cache_stats {
85	unsigned int lookups;
86	unsigned int hits;
87	unsigned int misses;
88	unsigned int allocations;
89	unsigned int reclaims;
90	unsigned int frees;
91};
92
93/*
94 * AVC operations
95 */
96
97void __init avc_init(void);
98
99void avc_audit(u32 ssid, u32 tsid,
100	       u16 tclass, u32 requested,
101	       struct av_decision *avd, int result, struct avc_audit_data *auditdata);
102
103#define AVC_STRICT 1 /* Ignore permissive mode. */
104int avc_has_perm_noaudit(u32 ssid, u32 tsid,
105			 u16 tclass, u32 requested,
106			 unsigned flags,
107			 struct av_decision *avd);
108
109int avc_has_perm(u32 ssid, u32 tsid,
110		 u16 tclass, u32 requested,
111		 struct avc_audit_data *auditdata);
112
113u32 avc_policy_seqno(void);
114
115#define AVC_CALLBACK_GRANT		1
116#define AVC_CALLBACK_TRY_REVOKE		2
117#define AVC_CALLBACK_REVOKE		4
118#define AVC_CALLBACK_RESET		8
119#define AVC_CALLBACK_AUDITALLOW_ENABLE	16
120#define AVC_CALLBACK_AUDITALLOW_DISABLE	32
121#define AVC_CALLBACK_AUDITDENY_ENABLE	64
122#define AVC_CALLBACK_AUDITDENY_DISABLE	128
123
124int avc_add_callback(int (*callback)(u32 event, u32 ssid, u32 tsid,
125				     u16 tclass, u32 perms,
126				     u32 *out_retained),
127		     u32 events, u32 ssid, u32 tsid,
128		     u16 tclass, u32 perms);
129
130/* Shows permission in human readable form */
131void avc_dump_av(struct audit_buffer *ab, u16 tclass, u32 av);
132
133/* Exported to selinuxfs */
134int avc_get_hash_stats(char *page);
135extern unsigned int avc_cache_threshold;
136
137#ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
138DECLARE_PER_CPU(struct avc_cache_stats, avc_cache_stats);
139#endif
140
141#endif /* _SELINUX_AVC_H_ */
142
143