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/in6.h>
  16 #include <asm/system.h>
  17 #include "flask.h"
  18 #include "av_permissions.h"
  19 #include "security.h"
  20
  21 #ifdef CONFIG_SECURITY_SELINUX_DEVELOP
  22 extern int selinux_enforcing;
  23 #else
  24 #define selinux_enforcing 1
  25 #endif
  26
  27 /*
  28  * An entry in the AVC.
  29  */
  30 struct avc_entry;
  31
  32 struct task_struct;
  33 struct vfsmount;
  34 struct dentry;
  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 vfsmount *mnt;
  50                         struct dentry *dentry;
  51                         struct inode *inode;
  52                 } fs;
  53                 struct {
  54                         int netif;
  55                         struct sock *sk;
  56                         u16 family;
  57                         __be16 dport;
  58                         __be16 sport;
  59                         union {
  60                                 struct {
  61                                         __be32 daddr;
  62                                         __be32 saddr;
  63                                 } v4;
  64                                 struct {
  65                                         struct in6_addr daddr;
  66                                         struct in6_addr saddr;
  67                                 } v6;
  68                         } fam;
  69                 } net;
  70                 int cap;
  71                 int ipc_id;
  72         } u;
  73 };
  74
  75 #define v4info fam.v4
  76 #define v6info fam.v6
  77
  78 /* Initialize an AVC audit data structure. */
  79 #define AVC_AUDIT_DATA_INIT(_d,_t) \
  80         { memset((_d), 0, sizeof(struct avc_audit_data)); (_d)->type = AVC_AUDIT_DATA_##_t; }
  81
  82 /*
  83  * AVC statistics
  84  */
  85 struct avc_cache_stats
  86 {
  87         unsigned int lookups;
  88         unsigned int hits;
  89         unsigned int misses;
  90         unsigned int allocations;
  91         unsigned int reclaims;
  92         unsigned int frees;
  93 };
  94
  95 /*
  96  * AVC operations
  97  */
  98
  99 void __init avc_init(void);
 100
 101 void avc_audit(u32 ssid, u32 tsid,
 102                u16 tclass, u32 requested,
 103                struct av_decision *avd, int result, struct avc_audit_data *auditdata);
 104
 105 #define AVC_STRICT 1 /* Ignore permissive mode. */
 106 int avc_has_perm_noaudit(u32 ssid, u32 tsid,
 107                          u16 tclass, u32 requested,
 108                          unsigned flags,
 109                          struct av_decision *avd);
 110
 111 int avc_has_perm(u32 ssid, u32 tsid,
 112                  u16 tclass, u32 requested,
 113                  struct avc_audit_data *auditdata);
 114
 115 u32 avc_policy_seqno(void);
 116
 117 #define AVC_CALLBACK_GRANT              1
 118 #define AVC_CALLBACK_TRY_REVOKE         2
 119 #define AVC_CALLBACK_REVOKE             4
 120 #define AVC_CALLBACK_RESET              8
 121 #define AVC_CALLBACK_AUDITALLOW_ENABLE  16
 122 #define AVC_CALLBACK_AUDITALLOW_DISABLE 32
 123 #define AVC_CALLBACK_AUDITDENY_ENABLE   64
 124 #define AVC_CALLBACK_AUDITDENY_DISABLE  128
 125
 126 int avc_add_callback(int (*callback)(u32 event, u32 ssid, u32 tsid,
 127                                      u16 tclass, u32 perms,
 128                                      u32 *out_retained),
 129                      u32 events, u32 ssid, u32 tsid,
 130                      u16 tclass, u32 perms);
 131
 132 /* Exported to selinuxfs */
 133 int avc_get_hash_stats(char *page);
 134 extern unsigned int avc_cache_threshold;
 135
 136 #ifdef CONFIG_SECURITY_SELINUX_AVC_STATS
 137 DECLARE_PER_CPU(struct avc_cache_stats, avc_cache_stats);
 138 #endif
 139
 140 #endif /* _SELINUX_AVC_H_ */
 141