FreeBSD/Linux Kernel Cross Reference
sys/kernel/audit.h

     /* audit -- definition of audit_context structure and supporting types 
      *
      * Copyright 2003-2004 Red Hat, Inc.
      * Copyright 2005 Hewlett-Packard Development Company, L.P.
      * Copyright 2005 IBM Corporation
      *
      * This program is free software; you can redistribute it and/or modify
      * it under the terms of the GNU General Public License as published by
      * the Free Software Foundation; either version 2 of the License, or
     * (at your option) any later version.
     *
     * This program is distributed in the hope that it will be useful,
     * but WITHOUT ANY WARRANTY; without even the implied warranty of
     * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     * GNU General Public License for more details.
     *
     * You should have received a copy of the GNU General Public License
     * along with this program; if not, write to the Free Software
     * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
     */
    
    #include <linux/fs.h>
    #include <linux/audit.h>
    #include <linux/skbuff.h>
    
    /* 0 = no checking
       1 = put_count checking
       2 = verbose put_count checking
    */
    #define AUDIT_DEBUG 0
    
    /* At task start time, the audit_state is set in the audit_context using
       a per-task filter.  At syscall entry, the audit_state is augmented by
       the syscall filter. */
    enum audit_state {
            AUDIT_DISABLED,         /* Do not create per-task audit_context.
                                     * No syscall-specific audit records can
                                     * be generated. */
            AUDIT_BUILD_CONTEXT,    /* Create the per-task audit_context,
                                     * and fill it in at syscall
                                     * entry time.  This makes a full
                                     * syscall record available if some
                                     * other part of the kernel decides it
                                     * should be recorded. */
            AUDIT_RECORD_CONTEXT    /* Create the per-task audit_context,
                                     * always fill it in at syscall entry
                                     * time, and always write out the audit
                                     * record at syscall exit time.  */
    };
    
    /* Rule lists */
    struct audit_watch;
    struct audit_tree;
    struct audit_chunk;
    
    struct audit_entry {
            struct list_head        list;
            struct rcu_head         rcu;
            struct audit_krule      rule;
    };
    
    #ifdef CONFIG_AUDIT
    extern int audit_enabled;
    extern int audit_ever_enabled;
    #endif
    
    extern int audit_pid;
    
    #define AUDIT_INODE_BUCKETS     32
    extern struct list_head audit_inode_hash[AUDIT_INODE_BUCKETS];
    
    static inline int audit_hash_ino(u32 ino)
    {
            return (ino & (AUDIT_INODE_BUCKETS-1));
    }
    
    /* Indicates that audit should log the full pathname. */
    #define AUDIT_NAME_FULL -1
    
    extern int audit_match_class(int class, unsigned syscall);
    extern int audit_comparator(const u32 left, const u32 op, const u32 right);
    extern int audit_uid_comparator(kuid_t left, u32 op, kuid_t right);
    extern int audit_gid_comparator(kgid_t left, u32 op, kgid_t right);
    extern int parent_len(const char *path);
    extern int audit_compare_dname_path(const char *dname, const char *path, int plen);
    extern struct sk_buff *     audit_make_reply(int pid, int seq, int type,
                                                 int done, int multi,
                                                 const void *payload, int size);
    extern void                 audit_panic(const char *message);
    
    struct audit_netlink_list {
            int pid;
            struct sk_buff_head q;
    };
    
    int audit_send_list(void *);
    
    extern int selinux_audit_rule_update(void);
    
   extern struct mutex audit_filter_mutex;
   extern void audit_free_rule_rcu(struct rcu_head *);
   extern struct list_head audit_filter_list[];
   
   extern struct audit_entry *audit_dupe_rule(struct audit_krule *old);
   
   /* audit watch functions */
   #ifdef CONFIG_AUDIT_WATCH
   extern void audit_put_watch(struct audit_watch *watch);
   extern void audit_get_watch(struct audit_watch *watch);
   extern int audit_to_watch(struct audit_krule *krule, char *path, int len, u32 op);
   extern int audit_add_watch(struct audit_krule *krule, struct list_head **list);
   extern void audit_remove_watch_rule(struct audit_krule *krule);
   extern char *audit_watch_path(struct audit_watch *watch);
   extern int audit_watch_compare(struct audit_watch *watch, unsigned long ino, dev_t dev);
   #else
   #define audit_put_watch(w) {}
   #define audit_get_watch(w) {}
   #define audit_to_watch(k, p, l, o) (-EINVAL)
   #define audit_add_watch(k, l) (-EINVAL)
   #define audit_remove_watch_rule(k) BUG()
   #define audit_watch_path(w) ""
   #define audit_watch_compare(w, i, d) 0
   
   #endif /* CONFIG_AUDIT_WATCH */
   
   #ifdef CONFIG_AUDIT_TREE
   extern struct audit_chunk *audit_tree_lookup(const struct inode *);
   extern void audit_put_chunk(struct audit_chunk *);
   extern int audit_tree_match(struct audit_chunk *, struct audit_tree *);
   extern int audit_make_tree(struct audit_krule *, char *, u32);
   extern int audit_add_tree_rule(struct audit_krule *);
   extern int audit_remove_tree_rule(struct audit_krule *);
   extern void audit_trim_trees(void);
   extern int audit_tag_tree(char *old, char *new);
   extern const char *audit_tree_path(struct audit_tree *);
   extern void audit_put_tree(struct audit_tree *);
   extern void audit_kill_trees(struct list_head *);
   #else
   #define audit_remove_tree_rule(rule) BUG()
   #define audit_add_tree_rule(rule) -EINVAL
   #define audit_make_tree(rule, str, op) -EINVAL
   #define audit_trim_trees() (void)0
   #define audit_put_tree(tree) (void)0
   #define audit_tag_tree(old, new) -EINVAL
   #define audit_tree_path(rule) ""        /* never called */
   #define audit_kill_trees(list) BUG()
   #endif
   
   extern char *audit_unpack_string(void **, size_t *, size_t);
   
   extern pid_t audit_sig_pid;
   extern kuid_t audit_sig_uid;
   extern u32 audit_sig_sid;
   
   #ifdef CONFIG_AUDITSYSCALL
   extern int __audit_signal_info(int sig, struct task_struct *t);
   static inline int audit_signal_info(int sig, struct task_struct *t)
   {
           if (unlikely((audit_pid && t->tgid == audit_pid) ||
                        (audit_signals && !audit_dummy_context())))
                   return __audit_signal_info(sig, t);
           return 0;
   }
   extern void audit_filter_inodes(struct task_struct *, struct audit_context *);
   extern struct list_head *audit_killed_trees(void);
   #else
   #define audit_signal_info(s,t) AUDIT_DISABLED
   #define audit_filter_inodes(t,c) AUDIT_DISABLED
   #endif
   
   extern struct mutex audit_cmd_mutex;

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