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netfilter: audit target to record accepted/dropped packets

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This patch adds a new netfilter target which creates audit records
for packets traversing a certain chain.

It can be used to record packets which are rejected administraively
as follows:

  -N AUDIT_DROP
  -A AUDIT_DROP -j AUDIT --type DROP
  -A AUDIT_DROP -j DROP

a rule which would typically drop or reject a packet would then
invoke the new chain to record packets before dropping them.

  -j AUDIT_DROP

The module is protocol independant and works for iptables, ip6tables
and ebtables.

The following information is logged:
 - netfilter hook
 - packet length
 - incomming/outgoing interface
 - MAC src/dst/proto for ethernet packets
 - src/dst/protocol address for IPv4/IPv6
 - src/dst port for TCP/UDP/UDPLITE
 - icmp type/code

Cc: Patrick McHardy <kaber@trash.net>
Cc: Eric Paris <eparis@parisplace.org>
Cc: Al Viro <viro@ZenIV.linux.org.uk>
Signed-off-by: Thomas Graf <tgraf@redhat.com>
Signed-off-by: Patrick McHardy <kaber@trash.net>
This commit is contained in:
Thomas Graf 2011-01-16 18:10:28 +01:00 • committed by Patrick McHardy
commit 43f393caec
6 changed files with 247 additions and 0 deletions
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1
include/linux/audit.h
View file

@ -103,6 +103,7 @@
#define AUDIT_BPRM_FCAPS 1321 /* Information about fcaps increasing perms */
#define AUDIT_CAPSET 1322 /* Record showing argument to sys_capset */
#define AUDIT_MMAP 1323 /* Record showing descriptor and flags in mmap */
#define AUDIT_NETFILTER_PKT 1324 /* Packets traversing netfilter chains */
#define AUDIT_AVC 1400 /* SE Linux avc denial or grant */
#define AUDIT_SELINUX_ERR 1401 /* Internal SE Linux Errors */

1
include/linux/netfilter/Kbuild
View file

@ -9,6 +9,7 @@ header-y += nfnetlink_conntrack.h
header-y += nfnetlink_log.h
header-y += nfnetlink_queue.h
header-y += x_tables.h
header-y += xt_AUDIT.h
header-y += xt_CHECKSUM.h
header-y += xt_CLASSIFY.h
header-y += xt_CONNMARK.h

30
include/linux/netfilter/xt_AUDIT.h Normal file
View file

@ -0,0 +1,30 @@
/*
* Header file for iptables xt_AUDIT target
*
* (C) 2010-2011 Thomas Graf <tgraf@redhat.com>
* (C) 2010-2011 Red Hat, Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#ifndef _XT_AUDIT_TARGET_H
#define _XT_AUDIT_TARGET_H
#include <linux/types.h>
enum {
XT_AUDIT_TYPE_ACCEPT = 0,
XT_AUDIT_TYPE_DROP,
XT_AUDIT_TYPE_REJECT,
__XT_AUDIT_TYPE_MAX,
};
#define XT_AUDIT_TYPE_MAX (__XT_AUDIT_TYPE_MAX - 1)
struct xt_audit_info {
__u8 type; /* XT_AUDIT_TYPE_* */
};
#endif /* _XT_AUDIT_TARGET_H */