kernel/audit.h

   1 /* audit -- definition of audit_context structure and supporting types
   2  *
   3  * Copyright 2003-2004 Red Hat, Inc.
   4  * Copyright 2005 Hewlett-Packard Development Company, L.P.
   5  * Copyright 2005 IBM Corporation
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  */
  21
  22 #include <linux/fs.h>
  23 #include <linux/audit.h>
  24 #include <linux/skbuff.h>
  25
  26 /* 0 = no checking
  27    1 = put_count checking
  28    2 = verbose put_count checking
  29 */
  30 #define AUDIT_DEBUG 0
  31
  32 /* At task start time, the audit_state is set in the audit_context using
  33    a per-task filter.  At syscall entry, the audit_state is augmented by
  34    the syscall filter. */
  35 enum audit_state {
  36         AUDIT_DISABLED,         /* Do not create per-task audit_context.
  37                                  * No syscall-specific audit records can
  38                                  * be generated. */
  39         AUDIT_SETUP_CONTEXT,    /* Create the per-task audit_context,
  40                                  * but don't necessarily fill it in at
  41                                  * syscall entry time (i.e., filter
  42                                  * instead). */
  43         AUDIT_BUILD_CONTEXT,    /* Create the per-task audit_context,
  44                                  * and always fill it in at syscall
  45                                  * entry time.  This makes a full
  46                                  * syscall record available if some
  47                                  * other part of the kernel decides it
  48                                  * should be recorded. */
  49         AUDIT_RECORD_CONTEXT    /* Create the per-task audit_context,
  50                                  * always fill it in at syscall entry
  51                                  * time, and always write out the audit
  52                                  * record at syscall exit time.  */
  53 };
  54
  55 /* Rule lists */
  56 struct audit_watch;
  57 struct audit_tree;
  58 struct audit_chunk;
  59
  60 struct audit_entry {
  61         struct list_head        list;
  62         struct rcu_head         rcu;
  63         struct audit_krule      rule;
  64 };
  65
  66 #ifdef CONFIG_AUDIT
  67 extern int audit_enabled;
  68 extern int audit_ever_enabled;
  69 #endif
  70
  71 extern int audit_pid;
  72
  73 #define AUDIT_INODE_BUCKETS     32
  74 extern struct list_head audit_inode_hash[AUDIT_INODE_BUCKETS];
  75
  76 static inline int audit_hash_ino(u32 ino)
  77 {
  78         return (ino & (AUDIT_INODE_BUCKETS-1));
  79 }
  80
  81 extern int audit_match_class(int class, unsigned syscall);
  82 extern int audit_comparator(const u32 left, const u32 op, const u32 right);
  83 extern int audit_compare_dname_path(const char *dname, const char *path,
  84                                     int *dirlen);
  85 extern struct sk_buff *     audit_make_reply(int pid, int seq, int type,
  86                                              int done, int multi,
  87                                              void *payload, int size);
  88 extern void                 audit_send_reply(int pid, int seq, int type,
  89                                              int done, int multi,
  90                                              void *payload, int size);
  91 extern void                 audit_panic(const char *message);
  92
  93 struct audit_netlink_list {
  94         int pid;
  95         struct sk_buff_head q;
  96 };
  97
  98 int audit_send_list(void *);
  99
 100 extern int selinux_audit_rule_update(void);
 101
 102 extern struct mutex audit_filter_mutex;
 103 extern void audit_free_rule_rcu(struct rcu_head *);
 104 extern struct list_head audit_filter_list[];
 105
 106 /* audit watch functions */
 107 extern unsigned long audit_watch_inode(struct audit_watch *watch);
 108 extern dev_t audit_watch_dev(struct audit_watch *watch);
 109 extern void audit_put_watch(struct audit_watch *watch);
 110 extern void audit_get_watch(struct audit_watch *watch);
 111 extern int audit_to_watch(struct audit_krule *krule, char *path, int len, u32 op);
 112 extern int audit_get_nd(char *path, struct nameidata **ndp, struct nameidata **ndw);
 113 extern void audit_put_nd(struct nameidata *ndp, struct nameidata *ndw);
 114 extern int audit_add_watch(struct audit_krule *krule, struct nameidata *ndp,
 115                            struct nameidata *ndw);
 116 extern void audit_remove_watch(struct audit_watch *watch);
 117 extern void audit_remove_watch_rule(struct audit_krule *krule, struct list_head *list);
 118 extern void audit_inotify_unregister(struct list_head *in_list);
 119 extern char *audit_watch_path(struct audit_watch *watch);
 120 extern struct list_head *audit_watch_rules(struct audit_watch *watch);
 121
 122 extern struct audit_entry *audit_dupe_rule(struct audit_krule *old,
 123                                            struct audit_watch *watch);
 124
 125 #ifdef CONFIG_AUDIT_TREE
 126 extern struct audit_chunk *audit_tree_lookup(const struct inode *);
 127 extern void audit_put_chunk(struct audit_chunk *);
 128 extern int audit_tree_match(struct audit_chunk *, struct audit_tree *);
 129 extern int audit_make_tree(struct audit_krule *, char *, u32);
 130 extern int audit_add_tree_rule(struct audit_krule *);
 131 extern int audit_remove_tree_rule(struct audit_krule *);
 132 extern void audit_trim_trees(void);
 133 extern int audit_tag_tree(char *old, char *new);
 134 extern void audit_schedule_prune(void);
 135 extern void audit_prune_trees(void);
 136 extern const char *audit_tree_path(struct audit_tree *);
 137 extern void audit_put_tree(struct audit_tree *);
 138 #else
 139 #define audit_remove_tree_rule(rule) BUG()
 140 #define audit_add_tree_rule(rule) -EINVAL
 141 #define audit_make_tree(rule, str, op) -EINVAL
 142 #define audit_trim_trees() (void)0
 143 #define audit_put_tree(tree) (void)0
 144 #define audit_tag_tree(old, new) -EINVAL
 145 #define audit_tree_path(rule) ""        /* never called */
 146 #endif
 147
 148 extern char *audit_unpack_string(void **, size_t *, size_t);
 149
 150 extern pid_t audit_sig_pid;
 151 extern uid_t audit_sig_uid;
 152 extern u32 audit_sig_sid;
 153
 154 #ifdef CONFIG_AUDITSYSCALL
 155 extern int __audit_signal_info(int sig, struct task_struct *t);
 156 static inline int audit_signal_info(int sig, struct task_struct *t)
 157 {
 158         if (unlikely((audit_pid && t->tgid == audit_pid) ||
 159                      (audit_signals && !audit_dummy_context())))
 160                 return __audit_signal_info(sig, t);
 161         return 0;
 162 }
 163 extern void audit_filter_inodes(struct task_struct *, struct audit_context *);
 164 #else
 165 #define audit_signal_info(s,t) AUDIT_DISABLED
 166 #define audit_filter_inodes(t,c) AUDIT_DISABLED
 167 #endif