security/selinux/include/avc.h

   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
  24 extern int selinux_enforcing;
  25 #else
  26 #define selinux_enforcing 1
  27 #endif
  28
  29 /*
  30  * An entry in the AVC.
  31  */
  32 struct avc_entry;
  33
  34 struct task_struct;
  35 struct inode;
  36 struct sock;
  37 struct sk_buff;
  38
  39 /* Auxiliary data to use in generating the audit record. */
  40 struct 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  */
  84 struct 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
  97 void __init avc_init(void);
  98
  99 void 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. */
 104 int avc_has_perm_noaudit(u32 ssid, u32 tsid,
 105                          u16 tclass, u32 requested,
 106                          unsigned flags,
 107                          struct av_decision *avd);
 108
 109 int avc_has_perm(u32 ssid, u32 tsid,
 110                  u16 tclass, u32 requested,
 111                  struct avc_audit_data *auditdata);
 112
 113 u32 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
 124 int 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 */
 131 void avc_dump_av(struct audit_buffer *ab, u16 tclass, u32 av);
 132
 133 /* Exported to selinuxfs */
 134 int avc_get_hash_stats(char *page);
 135 extern unsigned int avc_cache_threshold;
 136
 137 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
 138 DECLARE_PER_CPU(struct avc_cache_stats, avc_cache_stats);
 139 #endif
 140
 141 #endif /* _SELINUX_AVC_H_ */
 142