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#!/usr/bin/perl -w
#
###########################################################################
#
# File: kmsgsd
#
# Purpose: kmsgsd separates iptables messages from all other
# kernel messages.
#
# Strategy: read message from the /var/lib/psad/psadfifo named pipe and
# print any firewall related dop/reject/deny messages to
# the psad data file "/var/log/psad/fwdata".
#
# Author: Michael Rash (mbr@cipherdyne.org)
#
# Credits: (see the CREDITS file)
#
# Copyright (C) 1999-2001 Michael Rash (mbr@cipherdyne.org)
#
# License (GNU Public License):
#
# 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
#
###########################################################################
#
# $Id: kmsgsd.pl,v 1.32 2005/03/06 16:58:32 mbr Exp $
#
use lib '/usr/lib/psad';
use Psad;
use POSIX 'setsid';
use Getopt::Long 'GetOptions';
use strict;
### establish the default path to the config file (can be
### over-ridden with the -c <file> command line option.
my $CONFIG_FILE = '/etc/psad/kmsgsd.conf';
### configuration hash
my %config;
### commands hash
my %cmds;
### flag used for HUP signal
my $hup_flag = 0;
### handle command line arguments
die " ** Specify the path to the psad.conf file with " .
"\"-c <file>\".\n\n" unless (GetOptions (
'config=s' => \$CONFIG_FILE
));
### import config
&import_config();
### make sure there is not another kmsgsd already running
&Psad::unique_pid($config{'KMSGSD_PID_FILE'});
### install HUP handler so config can be re-imported
$SIG{'HUP'} = \&hup_sig;
my $pid = fork;
exit if $pid;
die " ** $0: Couldn't fork: $!" unless defined($pid);
POSIX::setsid() or die " ** $0: Can't start a new session: $!\n";
### write the pid to the pid file
&Psad::writepid($config{'KMSGSD_PID_FILE'});
### open the fwdata file
open LOG, ">> $config{'FW_DATA_FILE'}" or
die "Could not open $config{'FW_DATA_FILE'}: $!\n";
#===================== main =======================
### main loop
for (;;) {
open FIFO, "< $config{'PSAD_FIFO'}" or die "Can't open file : $!\n";
my $service = <FIFO>; ### don't chomp for better performance
if (defined $service
&& ($service =~ /Packet\slog/ || $service =~ /IN.+?OUT/)
&& ($service =~ /$config{'FW_MSG_SEARCH'}/
|| $service =~ /$config{'SNORT_SID_STR'}/)) {
### log to the fwdata file
my $old_fh = select LOG;
$| = 1;
print $service;
select $old_fh;
}
if ($hup_flag) {
### clear the HUP flag and re-import the config
$hup_flag = 0;
&import_config();
close FIFO;
open FIFO, "< $config{'PSAD_FIFO'}" or
die "Can't open file : $!\n";
&Psad::psyslog('psad(kmsgsd)', 'received HUP signal, ' .
're-importing kmsgsd.conf');
}
}
### These statements don't get executed, but for completeness...
close LOG;
close FIFO;
exit 0;
#==================== end main =====================
sub import_config() {
### read in the configuration file
&Psad::buildconf(\%config, \%cmds, $CONFIG_FILE);
### make sure the configuration is complete
&required_vars();
### Check to make sure the commands specified in the config section
### are in the right place, and attempt to correct automatically if not.
&Psad::check_commands(\%cmds);
return;
}
sub required_vars() {
my @required_vars = qw(
KMSGSD_PID_FILE PSAD_FIFO FW_DATA_FILE
FW_MSG_SEARCH SNORT_SID_STR
);
&Psad::defined_vars($CONFIG_FILE, \@required_vars, \%config);
return;
}
sub hup_sig() {
$hup_flag = 1;
return;
}
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