[deliverable/linux.git] / 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));
}

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_compare_dname_path(const char *dname, const char *path,
				    int *dirlen);
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 uid_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;
Commit	Line	Data
	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_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 */
	52	struct audit_watch;
	53	struct audit_tree;
	54	struct audit_chunk;
	55
	56	struct audit_entry {
	57	struct list_head list;
	58	struct rcu_head rcu;
	59	struct audit_krule rule;
	60	};
	61
	62	#ifdef CONFIG_AUDIT
	63	extern int audit_enabled;
	64	extern int audit_ever_enabled;
	65	#endif
	66
	67	extern int audit_pid;
	68
	69	#define AUDIT_INODE_BUCKETS 32
	70	extern struct list_head audit_inode_hash[AUDIT_INODE_BUCKETS];
	71
	72	static inline int audit_hash_ino(u32 ino)
	73	{
	74	return (ino & (AUDIT_INODE_BUCKETS-1));
	75	}
	76
	77	extern int audit_match_class(int class, unsigned syscall);
	78	extern int audit_comparator(const u32 left, const u32 op, const u32 right);
	79	extern int audit_compare_dname_path(const char dname, const char path,
	80	int *dirlen);
	81	extern struct sk_buff * audit_make_reply(int pid, int seq, int type,
	82	int done, int multi,
	83	const void *payload, int size);
	84	extern void audit_panic(const char *message);
	85
	86	struct audit_netlink_list {
	87	int pid;
	88	struct sk_buff_head q;
	89	};
	90
	91	int audit_send_list(void *);
	92
	93	extern int selinux_audit_rule_update(void);
	94
	95	extern struct mutex audit_filter_mutex;
	96	extern void audit_free_rule_rcu(struct rcu_head *);
	97	extern struct list_head audit_filter_list[];
	98
	99	extern struct audit_entry audit_dupe_rule(struct audit_krule old);
	100
	101	/* audit watch functions */
	102	#ifdef CONFIG_AUDIT_WATCH
	103	extern void audit_put_watch(struct audit_watch *watch);
	104	extern void audit_get_watch(struct audit_watch *watch);
	105	extern int audit_to_watch(struct audit_krule krule, char path, int len, u32 op);
	106	extern int audit_add_watch(struct audit_krule krule, struct list_head *list);
	107	extern void audit_remove_watch_rule(struct audit_krule *krule);
	108	extern char audit_watch_path(struct audit_watch watch);
	109	extern 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
	122	extern struct audit_chunk audit_tree_lookup(const struct inode );
	123	extern void audit_put_chunk(struct audit_chunk *);
	124	extern int audit_tree_match(struct audit_chunk , struct audit_tree );
	125	extern int audit_make_tree(struct audit_krule , char , u32);
	126	extern int audit_add_tree_rule(struct audit_krule *);
	127	extern int audit_remove_tree_rule(struct audit_krule *);
	128	extern void audit_trim_trees(void);
	129	extern int audit_tag_tree(char old, char new);
	130	extern const char audit_tree_path(struct audit_tree );
	131	extern void audit_put_tree(struct audit_tree *);
	132	extern 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
	144	extern char audit_unpack_string(void , size_t , size_t);
	145
	146	extern pid_t audit_sig_pid;
	147	extern uid_t audit_sig_uid;
	148	extern u32 audit_sig_sid;
	149
	150	#ifdef CONFIG_AUDITSYSCALL
	151	extern int __audit_signal_info(int sig, struct task_struct *t);
	152	static 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	}
	159	extern void audit_filter_inodes(struct task_struct , struct audit_context );
	160	extern 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
	166	extern struct mutex audit_cmd_mutex;