linux/kernel/audit.h
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   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. */
  35enum audit_state {
  36        AUDIT_DISABLED,         /* Do not create per-task audit_context.
  37                                 * No syscall-specific audit records can
  38                                 * be generated. */
  39        AUDIT_BUILD_CONTEXT,    /* Create the per-task audit_context,
  40                                 * and fill it in at syscall
  41                                 * entry time.  This makes a full
  42                                 * syscall record available if some
  43                                 * other part of the kernel decides it
  44                                 * should be recorded. */
  45        AUDIT_RECORD_CONTEXT    /* Create the per-task audit_context,
  46                                 * always fill it in at syscall entry
  47                                 * time, and always write out the audit
  48                                 * record at syscall exit time.  */
  49};
  50
  51/* Rule lists */
  52struct audit_watch;
  53struct audit_tree;
  54struct audit_chunk;
  55
  56struct audit_entry {
  57        struct list_head        list;
  58        struct rcu_head         rcu;
  59        struct audit_krule      rule;
  60};
  61
  62#ifdef CONFIG_AUDIT
  63extern int audit_enabled;
  64extern int audit_ever_enabled;
  65#endif
  66
  67extern int audit_pid;
  68
  69#define AUDIT_INODE_BUCKETS     32
  70extern struct list_head audit_inode_hash[AUDIT_INODE_BUCKETS];
  71
  72static inline int audit_hash_ino(u32 ino)
  73{
  74        return (ino & (AUDIT_INODE_BUCKETS-1));
  75}
  76
  77extern int audit_match_class(int class, unsigned syscall);
  78extern int audit_comparator(const u32 left, const u32 op, const u32 right);
  79extern int audit_compare_dname_path(const char *dname, const char *path,
  80                                    int *dirlen);
  81extern struct sk_buff *     audit_make_reply(int pid, int seq, int type,
  82                                             int done, int multi,
  83                                             const void *payload, int size);
  84extern void                 audit_panic(const char *message);
  85
  86struct audit_netlink_list {
  87        int pid;
  88        struct sk_buff_head q;
  89};
  90
  91int audit_send_list(void *);
  92
  93extern int selinux_audit_rule_update(void);
  94
  95extern struct mutex audit_filter_mutex;
  96extern void audit_free_rule_rcu(struct rcu_head *);
  97extern struct list_head audit_filter_list[];
  98
  99extern struct audit_entry *audit_dupe_rule(struct audit_krule *old);
 100
 101/* audit watch functions */
 102#ifdef CONFIG_AUDIT_WATCH
 103extern void audit_put_watch(struct audit_watch *watch);
 104extern void audit_get_watch(struct audit_watch *watch);
 105extern int audit_to_watch(struct audit_krule *krule, char *path, int len, u32 op);
 106extern int audit_add_watch(struct audit_krule *krule, struct list_head **list);
 107extern void audit_remove_watch_rule(struct audit_krule *krule);
 108extern char *audit_watch_path(struct audit_watch *watch);
 109extern int audit_watch_compare(struct audit_watch *watch, unsigned long ino, dev_t dev);
 110#else
 111#define audit_put_watch(w) {}
 112#define audit_get_watch(w) {}
 113#define audit_to_watch(k, p, l, o) (-EINVAL)
 114#define audit_add_watch(k, l) (-EINVAL)
 115#define audit_remove_watch_rule(k) BUG()
 116#define audit_watch_path(w) ""
 117#define audit_watch_compare(w, i, d) 0
 118
 119#endif /* CONFIG_AUDIT_WATCH */
 120
 121#ifdef CONFIG_AUDIT_TREE
 122extern struct audit_chunk *audit_tree_lookup(const struct inode *);
 123extern void audit_put_chunk(struct audit_chunk *);
 124extern int audit_tree_match(struct audit_chunk *, struct audit_tree *);
 125extern int audit_make_tree(struct audit_krule *, char *, u32);
 126extern int audit_add_tree_rule(struct audit_krule *);
 127extern int audit_remove_tree_rule(struct audit_krule *);
 128extern void audit_trim_trees(void);
 129extern int audit_tag_tree(char *old, char *new);
 130extern const char *audit_tree_path(struct audit_tree *);
 131extern void audit_put_tree(struct audit_tree *);
 132extern void audit_kill_trees(struct list_head *);
 133#else
 134#define audit_remove_tree_rule(rule) BUG()
 135#define audit_add_tree_rule(rule) -EINVAL
 136#define audit_make_tree(rule, str, op) -EINVAL
 137#define audit_trim_trees() (void)0
 138#define audit_put_tree(tree) (void)0
 139#define audit_tag_tree(old, new) -EINVAL
 140#define audit_tree_path(rule) ""        /* never called */
 141#define audit_kill_trees(list) BUG()
 142#endif
 143
 144extern char *audit_unpack_string(void **, size_t *, size_t);
 145
 146extern pid_t audit_sig_pid;
 147extern uid_t audit_sig_uid;
 148extern u32 audit_sig_sid;
 149
 150#ifdef CONFIG_AUDITSYSCALL
 151extern int __audit_signal_info(int sig, struct task_struct *t);
 152static inline int audit_signal_info(int sig, struct task_struct *t)
 153{
 154        if (unlikely((audit_pid && t->tgid == audit_pid) ||
 155                     (audit_signals && !audit_dummy_context())))
 156                return __audit_signal_info(sig, t);
 157        return 0;
 158}
 159extern void audit_filter_inodes(struct task_struct *, struct audit_context *);
 160extern struct list_head *audit_killed_trees(void);
 161#else
 162#define audit_signal_info(s,t) AUDIT_DISABLED
 163#define audit_filter_inodes(t,c) AUDIT_DISABLED
 164#endif
 165
 166extern struct mutex audit_cmd_mutex;
 167
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