2005-12-16 02:33:52 +08:00
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/* audit -- definition of audit_context structure and supporting types
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*
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* Copyright 2003-2004 Red Hat, Inc.
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* Copyright 2005 Hewlett-Packard Development Company, L.P.
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* Copyright 2005 IBM Corporation
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/fs.h>
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#include <linux/audit.h>
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2006-05-22 13:09:24 +08:00
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#include <linux/skbuff.h>
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2005-12-16 02:33:52 +08:00
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/* 0 = no checking
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1 = put_count checking
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2 = verbose put_count checking
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*/
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#define AUDIT_DEBUG 0
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/* At task start time, the audit_state is set in the audit_context using
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a per-task filter. At syscall entry, the audit_state is augmented by
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the syscall filter. */
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enum audit_state {
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AUDIT_DISABLED, /* Do not create per-task audit_context.
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* No syscall-specific audit records can
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* be generated. */
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AUDIT_SETUP_CONTEXT, /* Create the per-task audit_context,
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* but don't necessarily fill it in at
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* syscall entry time (i.e., filter
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* instead). */
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AUDIT_BUILD_CONTEXT, /* Create the per-task audit_context,
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* and always fill it in at syscall
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* entry time. This makes a full
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* syscall record available if some
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* other part of the kernel decides it
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* should be recorded. */
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AUDIT_RECORD_CONTEXT /* Create the per-task audit_context,
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* always fill it in at syscall entry
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* time, and always write out the audit
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* record at syscall exit time. */
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};
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/* Rule lists */
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[PATCH] audit: path-based rules
In this implementation, audit registers inotify watches on the parent
directories of paths specified in audit rules. When audit's inotify
event handler is called, it updates any affected rules based on the
filesystem event. If the parent directory is renamed, removed, or its
filesystem is unmounted, audit removes all rules referencing that
inotify watch.
To keep things simple, this implementation limits location-based
auditing to the directory entries in an existing directory. Given
a path-based rule for /foo/bar/passwd, the following table applies:
passwd modified -- audit event logged
passwd replaced -- audit event logged, rules list updated
bar renamed -- rule removed
foo renamed -- untracked, meaning that the rule now applies to
the new location
Audit users typically want to have many rules referencing filesystem
objects, which can significantly impact filtering performance. This
patch also adds an inode-number-based rule hash to mitigate this
situation.
The patch is relative to the audit git tree:
http://kernel.org/git/?p=linux/kernel/git/viro/audit-current.git;a=summary
and uses the inotify kernel API:
http://lkml.org/lkml/2006/6/1/145
Signed-off-by: Amy Griffis <amy.griffis@hp.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2006-04-08 04:55:56 +08:00
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struct audit_parent;
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struct audit_watch {
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atomic_t count; /* reference count */
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char *path; /* insertion path */
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dev_t dev; /* associated superblock device */
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unsigned long ino; /* associated inode number */
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struct audit_parent *parent; /* associated parent */
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struct list_head wlist; /* entry in parent->watches list */
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struct list_head rules; /* associated rules */
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};
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[PATCH] audit: watching subtrees
New kind of audit rule predicates: "object is visible in given subtree".
The part that can be sanely implemented, that is. Limitations:
* if you have hardlink from outside of tree, you'd better watch
it too (or just watch the object itself, obviously)
* if you mount something under a watched tree, tell audit
that new chunk should be added to watched subtrees
* if you umount something in a watched tree and it's still mounted
elsewhere, you will get matches on events happening there. New command
tells audit to recalculate the trees, trimming such sources of false
positives.
Note that it's _not_ about path - if something mounted in several places
(multiple mount, bindings, different namespaces, etc.), the match does
_not_ depend on which one we are using for access.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2007-07-22 20:04:18 +08:00
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struct audit_tree;
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struct audit_chunk;
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2005-12-16 02:33:52 +08:00
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struct audit_entry {
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2006-02-08 01:05:27 +08:00
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struct list_head list;
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struct rcu_head rcu;
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struct audit_krule rule;
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2005-12-16 02:33:52 +08:00
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};
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2008-04-27 17:39:17 +08:00
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#ifdef CONFIG_AUDIT
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extern int audit_enabled;
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extern int audit_ever_enabled;
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#endif
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2005-12-16 02:33:52 +08:00
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extern int audit_pid;
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[PATCH] audit: path-based rules
In this implementation, audit registers inotify watches on the parent
directories of paths specified in audit rules. When audit's inotify
event handler is called, it updates any affected rules based on the
filesystem event. If the parent directory is renamed, removed, or its
filesystem is unmounted, audit removes all rules referencing that
inotify watch.
To keep things simple, this implementation limits location-based
auditing to the directory entries in an existing directory. Given
a path-based rule for /foo/bar/passwd, the following table applies:
passwd modified -- audit event logged
passwd replaced -- audit event logged, rules list updated
bar renamed -- rule removed
foo renamed -- untracked, meaning that the rule now applies to
the new location
Audit users typically want to have many rules referencing filesystem
objects, which can significantly impact filtering performance. This
patch also adds an inode-number-based rule hash to mitigate this
situation.
The patch is relative to the audit git tree:
http://kernel.org/git/?p=linux/kernel/git/viro/audit-current.git;a=summary
and uses the inotify kernel API:
http://lkml.org/lkml/2006/6/1/145
Signed-off-by: Amy Griffis <amy.griffis@hp.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2006-04-08 04:55:56 +08:00
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#define AUDIT_INODE_BUCKETS 32
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extern struct list_head audit_inode_hash[AUDIT_INODE_BUCKETS];
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static inline int audit_hash_ino(u32 ino)
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{
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return (ino & (AUDIT_INODE_BUCKETS-1));
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}
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2006-09-01 07:26:40 +08:00
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extern int audit_match_class(int class, unsigned syscall);
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[PATCH] audit: path-based rules
In this implementation, audit registers inotify watches on the parent
directories of paths specified in audit rules. When audit's inotify
event handler is called, it updates any affected rules based on the
filesystem event. If the parent directory is renamed, removed, or its
filesystem is unmounted, audit removes all rules referencing that
inotify watch.
To keep things simple, this implementation limits location-based
auditing to the directory entries in an existing directory. Given
a path-based rule for /foo/bar/passwd, the following table applies:
passwd modified -- audit event logged
passwd replaced -- audit event logged, rules list updated
bar renamed -- rule removed
foo renamed -- untracked, meaning that the rule now applies to
the new location
Audit users typically want to have many rules referencing filesystem
objects, which can significantly impact filtering performance. This
patch also adds an inode-number-based rule hash to mitigate this
situation.
The patch is relative to the audit git tree:
http://kernel.org/git/?p=linux/kernel/git/viro/audit-current.git;a=summary
and uses the inotify kernel API:
http://lkml.org/lkml/2006/6/1/145
Signed-off-by: Amy Griffis <amy.griffis@hp.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2006-04-08 04:55:56 +08:00
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extern int audit_comparator(const u32 left, const u32 op, const u32 right);
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2006-06-09 11:19:31 +08:00
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extern int audit_compare_dname_path(const char *dname, const char *path,
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int *dirlen);
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2006-05-22 13:09:24 +08:00
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extern struct sk_buff * audit_make_reply(int pid, int seq, int type,
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int done, int multi,
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void *payload, int size);
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2005-12-16 02:33:52 +08:00
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extern void audit_send_reply(int pid, int seq, int type,
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int done, int multi,
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void *payload, int size);
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extern void audit_panic(const char *message);
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2006-03-11 08:14:06 +08:00
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2006-05-22 13:09:24 +08:00
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struct audit_netlink_list {
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int pid;
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struct sk_buff_head q;
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};
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int audit_send_list(void *);
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[PATCH] audit: path-based rules
In this implementation, audit registers inotify watches on the parent
directories of paths specified in audit rules. When audit's inotify
event handler is called, it updates any affected rules based on the
filesystem event. If the parent directory is renamed, removed, or its
filesystem is unmounted, audit removes all rules referencing that
inotify watch.
To keep things simple, this implementation limits location-based
auditing to the directory entries in an existing directory. Given
a path-based rule for /foo/bar/passwd, the following table applies:
passwd modified -- audit event logged
passwd replaced -- audit event logged, rules list updated
bar renamed -- rule removed
foo renamed -- untracked, meaning that the rule now applies to
the new location
Audit users typically want to have many rules referencing filesystem
objects, which can significantly impact filtering performance. This
patch also adds an inode-number-based rule hash to mitigate this
situation.
The patch is relative to the audit git tree:
http://kernel.org/git/?p=linux/kernel/git/viro/audit-current.git;a=summary
and uses the inotify kernel API:
http://lkml.org/lkml/2006/6/1/145
Signed-off-by: Amy Griffis <amy.griffis@hp.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2006-04-08 04:55:56 +08:00
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struct inotify_watch;
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2008-04-27 17:39:17 +08:00
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/* Inotify handle */
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extern struct inotify_handle *audit_ih;
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[PATCH] audit: path-based rules
In this implementation, audit registers inotify watches on the parent
directories of paths specified in audit rules. When audit's inotify
event handler is called, it updates any affected rules based on the
filesystem event. If the parent directory is renamed, removed, or its
filesystem is unmounted, audit removes all rules referencing that
inotify watch.
To keep things simple, this implementation limits location-based
auditing to the directory entries in an existing directory. Given
a path-based rule for /foo/bar/passwd, the following table applies:
passwd modified -- audit event logged
passwd replaced -- audit event logged, rules list updated
bar renamed -- rule removed
foo renamed -- untracked, meaning that the rule now applies to
the new location
Audit users typically want to have many rules referencing filesystem
objects, which can significantly impact filtering performance. This
patch also adds an inode-number-based rule hash to mitigate this
situation.
The patch is relative to the audit git tree:
http://kernel.org/git/?p=linux/kernel/git/viro/audit-current.git;a=summary
and uses the inotify kernel API:
http://lkml.org/lkml/2006/6/1/145
Signed-off-by: Amy Griffis <amy.griffis@hp.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2006-04-08 04:55:56 +08:00
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extern void audit_free_parent(struct inotify_watch *);
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extern void audit_handle_ievent(struct inotify_watch *, u32, u32, u32,
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const char *, struct inode *);
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2006-03-11 08:14:06 +08:00
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extern int selinux_audit_rule_update(void);
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2006-05-25 22:19:47 +08:00
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[PATCH] audit: watching subtrees
New kind of audit rule predicates: "object is visible in given subtree".
The part that can be sanely implemented, that is. Limitations:
* if you have hardlink from outside of tree, you'd better watch
it too (or just watch the object itself, obviously)
* if you mount something under a watched tree, tell audit
that new chunk should be added to watched subtrees
* if you umount something in a watched tree and it's still mounted
elsewhere, you will get matches on events happening there. New command
tells audit to recalculate the trees, trimming such sources of false
positives.
Note that it's _not_ about path - if something mounted in several places
(multiple mount, bindings, different namespaces, etc.), the match does
_not_ depend on which one we are using for access.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2007-07-22 20:04:18 +08:00
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extern struct mutex audit_filter_mutex;
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extern void audit_free_rule_rcu(struct rcu_head *);
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2008-04-27 17:39:17 +08:00
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extern struct list_head audit_filter_list[];
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[PATCH] audit: watching subtrees
New kind of audit rule predicates: "object is visible in given subtree".
The part that can be sanely implemented, that is. Limitations:
* if you have hardlink from outside of tree, you'd better watch
it too (or just watch the object itself, obviously)
* if you mount something under a watched tree, tell audit
that new chunk should be added to watched subtrees
* if you umount something in a watched tree and it's still mounted
elsewhere, you will get matches on events happening there. New command
tells audit to recalculate the trees, trimming such sources of false
positives.
Note that it's _not_ about path - if something mounted in several places
(multiple mount, bindings, different namespaces, etc.), the match does
_not_ depend on which one we are using for access.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2007-07-22 20:04:18 +08:00
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#ifdef CONFIG_AUDIT_TREE
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extern struct audit_chunk *audit_tree_lookup(const struct inode *);
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extern void audit_put_chunk(struct audit_chunk *);
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extern int audit_tree_match(struct audit_chunk *, struct audit_tree *);
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extern int audit_make_tree(struct audit_krule *, char *, u32);
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extern int audit_add_tree_rule(struct audit_krule *);
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extern int audit_remove_tree_rule(struct audit_krule *);
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extern void audit_trim_trees(void);
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extern int audit_tag_tree(char *old, char *new);
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extern void audit_schedule_prune(void);
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extern void audit_prune_trees(void);
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extern const char *audit_tree_path(struct audit_tree *);
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extern void audit_put_tree(struct audit_tree *);
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#else
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#define audit_remove_tree_rule(rule) BUG()
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#define audit_add_tree_rule(rule) -EINVAL
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#define audit_make_tree(rule, str, op) -EINVAL
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#define audit_trim_trees() (void)0
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#define audit_put_tree(tree) (void)0
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#define audit_tag_tree(old, new) -EINVAL
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#define audit_tree_path(rule) "" /* never called */
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#endif
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extern char *audit_unpack_string(void **, size_t *, size_t);
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2008-04-27 17:39:17 +08:00
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extern pid_t audit_sig_pid;
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extern uid_t audit_sig_uid;
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extern u32 audit_sig_sid;
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2006-05-25 22:19:47 +08:00
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#ifdef CONFIG_AUDITSYSCALL
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2007-03-30 06:01:04 +08:00
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extern int __audit_signal_info(int sig, struct task_struct *t);
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static inline int audit_signal_info(int sig, struct task_struct *t)
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2006-05-25 22:19:47 +08:00
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{
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2007-03-30 06:01:04 +08:00
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if (unlikely((audit_pid && t->tgid == audit_pid) ||
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(audit_signals && !audit_dummy_context())))
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return __audit_signal_info(sig, t);
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return 0;
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2006-05-25 22:19:47 +08:00
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}
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2008-12-15 12:45:27 +08:00
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extern void audit_filter_inodes(struct task_struct *, struct audit_context *);
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2006-05-25 22:19:47 +08:00
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#else
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2007-03-30 06:01:04 +08:00
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#define audit_signal_info(s,t) AUDIT_DISABLED
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[PATCH] audit: path-based rules
In this implementation, audit registers inotify watches on the parent
directories of paths specified in audit rules. When audit's inotify
event handler is called, it updates any affected rules based on the
filesystem event. If the parent directory is renamed, removed, or its
filesystem is unmounted, audit removes all rules referencing that
inotify watch.
To keep things simple, this implementation limits location-based
auditing to the directory entries in an existing directory. Given
a path-based rule for /foo/bar/passwd, the following table applies:
passwd modified -- audit event logged
passwd replaced -- audit event logged, rules list updated
bar renamed -- rule removed
foo renamed -- untracked, meaning that the rule now applies to
the new location
Audit users typically want to have many rules referencing filesystem
objects, which can significantly impact filtering performance. This
patch also adds an inode-number-based rule hash to mitigate this
situation.
The patch is relative to the audit git tree:
http://kernel.org/git/?p=linux/kernel/git/viro/audit-current.git;a=summary
and uses the inotify kernel API:
http://lkml.org/lkml/2006/6/1/145
Signed-off-by: Amy Griffis <amy.griffis@hp.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2006-04-08 04:55:56 +08:00
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#define audit_filter_inodes(t,c) AUDIT_DISABLED
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2006-05-25 22:19:47 +08:00
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#endif
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