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#! @PATHTOPERL@ -w
# vim:syntax=perl
use strict;
use lib '@LR_PERL5LIBDIR@';
use Lire::DlfSchema;
use Lire::Syslog;
use Lire::Program qw( :msg :dlf );
use Lire::Firewall qw/ firewall_number2names /;
init_dlf_converter( "firewall" );
my $schema = Lire::DlfSchema::load_schema( "firewall" );
my $dlf_maker =
$schema->make_hashref2asciidlf_func( qw/time rule action protocol
from_ip from_port rcv_intf snt_intf
to_ip to_port length count /);
my %ipt2dlf = (
IN => "rcv_intf",
OUT => "snt_intf",
SRC => "from_ip",
DST => "to_ip",
SPT => "from_port",
DPT => "to_port",
TYPE => "from_port",
CODE => "to_port",
LEN => "length",
PROTO => "protocol",
);
my $denied_re = qr/deny|denied|drop|reject/i;
my %field_re = ();
foreach my $k ( keys %ipt2dlf ) {
$field_re{$k} = qr/\b$k=(\S*)/;
}
my $lines = 0;
my $dlflines = 0;
my $errorlines = 0;
my $parser = new Lire::Syslog;
while (<>) {
chomp;
$lines++;
eval {
my $log = $parser->parse( $_ );
die "not an iptables line\n"
unless $log->{process} eq 'kernel';
my %dlf = ( time => $log->{timestamp},
count => 1,
);
# There is a problem with the IPTable log, there is no real
# informations on how to determine the reason the packet was
# logged, i.e. denied or permitted. The user must specify
# a custom label, we set the action to denied if we find common
# string in the label.
$dlf{rule} = $log->{content} =~ /^(.*)IN=/;
$dlf{action} = "denied" if $dlf{rule} =~ /$denied_re/;
while ( my ( $field, $re ) = each %field_re ) {
my ( $value ) = $log->{content} =~ /$re/;
($dlf{$ipt2dlf{$field}}) = $value
if defined $value;
}
# IPTables will log the following on all packet
die "iptables lexer failed\n"
unless exists $dlf{from_ip} &&
exists $dlf{to_ip} &&
exists $dlf{length} &&
exists $dlf{protocol};
firewall_number2names( \%dlf );
my $dlf = $dlf_maker->( \%dlf );
print join( " ", @$dlf), "\n";
$dlflines++;
};
if ($@) {
lr_warn( $@ );
lr_notice( qq{cannot convert line $. "$_" to firewall dlf, skipping} );
$errorlines++;
}
}
end_dlf_converter( $lines, $dlflines, $errorlines );
__END__
=pod
=head1 NAME
iptables2dlf - convert IP Tables syslog logs to firewall DLF
=head1 SYNOPSIS
B<iptables2dlf> I<file>
=head1 DESCRIPTION
B<iptables2dlf> converts Linux 2.4 packet log into firewall DLF format.
=head1 LIMITATIONS
The netfilter logging modules doesn't log the status of the packet
(drop, accept, reject) like the ipchains logging code. You can specify
a prefix that will be used in the log. This converter will marks the
packet as 'denied' whenever that prefix match (case insensitive) the
following regex: 'denied|deny|drop|reject', other packets will have
'-' as the value of the 'action' field.
So in order for that converter to detect 'denied' packets, you should use
prefix containing one of those substrings.
For example:
iptables -N lodrop
iptables -A logdrop -j LOG --log-prefix "Packet-DENY: "
iptables -A logdrop -j DROP
or other similar prefixes: 'denied: ', 'Packet-REJECT: ', ...
The prefix used will ends up in the 'rule' field of the DLF record.
=head1 SEE ALSO
The Netfilter webpage at http://netfilter.samba.org/ .
=head1 AUTHORS
Francis J. Lacoste <flacoste@logreport.org>
=head1 VERSION
$Id: iptables2dlf.in,v 1.2 2002/01/22 23:38:49 flacoste Exp $
=head1 COPYRIGHT
Copyright (C) 2001 Stichting LogReport Foundation LogReport@LogReport.org
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 (see COPYING); if not, check with
http://www.gnu.org/copyleft/gpl.html or write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
=cut
# Local Variables:
# mode: cperl
# End:
|
