[mirror_ubuntu-kernels.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_SETUP_CONTEXT,	/* Create the per-task audit_context,
				 * but don't necessarily fill it in at
				 * syscall entry time (i.e., filter
				 * instead). */
	AUDIT_BUILD_CONTEXT,	/* Create the per-task audit_context,
				 * and always 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_parent;

struct audit_watch {
	atomic_t		count;	/* reference count */
	char			*path;	/* insertion path */
	dev_t			dev;	/* associated superblock device */
	unsigned long		ino;	/* associated inode number */
	struct audit_parent	*parent; /* associated parent */
	struct list_head	wlist;	/* entry in parent->watches list */
	struct list_head	rules;	/* associated rules */
};

struct audit_field {
	u32				type;
	u32				val;
	u32				op;
	char				*se_str;
	struct selinux_audit_rule	*se_rule;
};

struct audit_tree;
struct audit_chunk;

struct audit_krule {
	int			vers_ops;
	u32			flags;
	u32			listnr;
	u32			action;
	u32			mask[AUDIT_BITMASK_SIZE];
	u32			buflen; /* for data alloc on list rules */
	u32			field_count;
	char			*filterkey; /* ties events to rules */
	struct audit_field	*fields;
	struct audit_field	*arch_f; /* quick access to arch field */
	struct audit_field	*inode_f; /* quick access to an inode field */
	struct audit_watch	*watch;	/* associated watch */
	struct audit_tree	*tree;	/* associated watched tree */
	struct list_head	rlist;	/* entry in audit_{watch,tree}.rules list */
};

struct audit_entry {
	struct list_head	list;
	struct rcu_head		rcu;
	struct audit_krule	rule;
};

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,
					     void *payload, int size);
extern void		    audit_send_reply(int pid, int seq, int type,
					     int done, int multi,
					     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 *);

struct inotify_watch;
extern void audit_free_parent(struct inotify_watch *);
extern void audit_handle_ievent(struct inotify_watch *, u32, u32, u32,
				const char *, struct inode *);
extern int selinux_audit_rule_update(void);

extern struct mutex audit_filter_mutex;
extern void audit_free_rule_rcu(struct rcu_head *);

#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 void audit_schedule_prune(void);
extern void audit_prune_trees(void);
extern const char *audit_tree_path(struct audit_tree *);
extern void audit_put_tree(struct audit_tree *);
#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 */
#endif

extern char *audit_unpack_string(void **, size_t *, size_t);

#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 enum audit_state audit_filter_inodes(struct task_struct *,
					    struct audit_context *);
extern void audit_set_auditable(struct audit_context *);
#else
#define audit_signal_info(s,t) AUDIT_DISABLED
#define audit_filter_inodes(t,c) AUDIT_DISABLED
#define audit_set_auditable(c)
#endif
Commit	Line	Data
fe7752ba DW	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>
9044e6bc	24	#include <linux/skbuff.h>
fe7752ba DW	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 */
f368c07d AG	56	struct audit_parent;
	57
	58	struct audit_watch {
	59	atomic_t count; /* reference count */
	60	char path; / insertion path */
	61	dev_t dev; /* associated superblock device */
	62	unsigned long ino; /* associated inode number */
	63	struct audit_parent parent; / associated parent */
	64	struct list_head wlist; /* entry in parent->watches list */
	65	struct list_head rules; /* associated rules */
	66	};
	67
93315ed6	68	struct audit_field {
3dc7e315 DG	69	u32 type;
	70	u32 val;
	71	u32 op;
	72	char *se_str;
	73	struct selinux_audit_rule *se_rule;
93315ed6 AG	74	};
93315ed6 AG	75
74c3cbe3 AV	76	struct audit_tree;
	77	struct audit_chunk;
	78
93315ed6 AG	79	struct audit_krule {
	80	int vers_ops;
	81	u32 flags;
	82	u32 listnr;
	83	u32 action;
	84	u32 mask[AUDIT_BITMASK_SIZE];
	85	u32 buflen; /* for data alloc on list rules */
	86	u32 field_count;
5adc8a6a	87	char filterkey; / ties events to rules */
93315ed6	88	struct audit_field *fields;
e54dc243	89	struct audit_field arch_f; / quick access to arch field */
f368c07d AG	90	struct audit_field inode_f; / quick access to an inode field */
f368c07d AG	91	struct audit_watch watch; / associated watch */
74c3cbe3 AV	92	struct audit_tree tree; / associated watched tree */
74c3cbe3 AV	93	struct list_head rlist; /* entry in audit_{watch,tree}.rules list */
93315ed6 AG	94	};
93315ed6 AG	95
fe7752ba	96	struct audit_entry {
93315ed6 AG	97	struct list_head list;
	98	struct rcu_head rcu;
	99	struct audit_krule rule;
fe7752ba DW	100	};
fe7752ba DW	101
fe7752ba	102	extern int audit_pid;
fe7752ba	103
f368c07d AG	104	#define AUDIT_INODE_BUCKETS 32
	105	extern struct list_head audit_inode_hash[AUDIT_INODE_BUCKETS];
	106
	107	static inline int audit_hash_ino(u32 ino)
	108	{
	109	return (ino & (AUDIT_INODE_BUCKETS-1));
	110	}
	111
55669bfa	112	extern int audit_match_class(int class, unsigned syscall);
f368c07d	113	extern int audit_comparator(const u32 left, const u32 op, const u32 right);
9c937dcc AG	114	extern int audit_compare_dname_path(const char dname, const char path,
9c937dcc AG	115	int *dirlen);
9044e6bc AV	116	extern struct sk_buff * audit_make_reply(int pid, int seq, int type,
	117	int done, int multi,
	118	void *payload, int size);
fe7752ba DW	119	extern void audit_send_reply(int pid, int seq, int type,
	120	int done, int multi,
	121	void *payload, int size);
fe7752ba	122	extern void audit_panic(const char *message);
3dc7e315	123
9044e6bc AV	124	struct audit_netlink_list {
	125	int pid;
	126	struct sk_buff_head q;
	127	};
	128
	129	int audit_send_list(void *);
	130
f368c07d AG	131	struct inotify_watch;
	132	extern void audit_free_parent(struct inotify_watch *);
	133	extern void audit_handle_ievent(struct inotify_watch *, u32, u32, u32,
	134	const char , struct inode );
3dc7e315	135	extern int selinux_audit_rule_update(void);
e1396065	136
74c3cbe3 AV	137	extern struct mutex audit_filter_mutex;
	138	extern void audit_free_rule_rcu(struct rcu_head *);
	139
	140	#ifdef CONFIG_AUDIT_TREE
	141	extern struct audit_chunk audit_tree_lookup(const struct inode );
	142	extern void audit_put_chunk(struct audit_chunk *);
	143	extern int audit_tree_match(struct audit_chunk , struct audit_tree );
	144	extern int audit_make_tree(struct audit_krule , char , u32);
	145	extern int audit_add_tree_rule(struct audit_krule *);
	146	extern int audit_remove_tree_rule(struct audit_krule *);
	147	extern void audit_trim_trees(void);
	148	extern int audit_tag_tree(char old, char new);
	149	extern void audit_schedule_prune(void);
	150	extern void audit_prune_trees(void);
	151	extern const char audit_tree_path(struct audit_tree );
	152	extern void audit_put_tree(struct audit_tree *);
	153	#else
	154	#define audit_remove_tree_rule(rule) BUG()
	155	#define audit_add_tree_rule(rule) -EINVAL
	156	#define audit_make_tree(rule, str, op) -EINVAL
	157	#define audit_trim_trees() (void)0
	158	#define audit_put_tree(tree) (void)0
	159	#define audit_tag_tree(old, new) -EINVAL
	160	#define audit_tree_path(rule) "" /* never called */
	161	#endif
	162
	163	extern char audit_unpack_string(void , size_t , size_t);
	164
e1396065	165	#ifdef CONFIG_AUDITSYSCALL
e54dc243 AG	166	extern int __audit_signal_info(int sig, struct task_struct *t);
e54dc243 AG	167	static inline int audit_signal_info(int sig, struct task_struct *t)
e1396065	168	{
e54dc243 AG	169	if (unlikely((audit_pid && t->tgid == audit_pid) \|\|
	170	(audit_signals && !audit_dummy_context())))
	171	return __audit_signal_info(sig, t);
	172	return 0;
e1396065	173	}
f368c07d AG	174	extern enum audit_state audit_filter_inodes(struct task_struct *,
	175	struct audit_context *);
	176	extern void audit_set_auditable(struct audit_context *);
e1396065	177	#else
e54dc243	178	#define audit_signal_info(s,t) AUDIT_DISABLED
f368c07d AG	179	#define audit_filter_inodes(t,c) AUDIT_DISABLED
f368c07d AG	180	#define audit_set_auditable(c)
e1396065	181	#endif