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#
# pptp.pm: Fwctl service module to handle the IPSec service over ESP.
#
# This file is part of Fwctl.
#
# Author: Francis J. Lacoste <francis@iNsu.COM>
#
# Copyright (c) 1999,2000 iNsu Innovations Inc.
#
# 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.
#
package Fwctl::Services::ipsec;
use strict;
use Fwctl::RuleSet qw(:udp_rulesets :ip_rulesets :masq );
use IPChains;
use Carp;
sub new {
my $proto = shift;
my $class = ref $proto || $proto;
bless {}, $class;
}
sub prototypes {
my ($self,$target,$options) = @_;
# Build prototype rule
(
IPChains->new(
Rule => $target,
Prot => 'udp',
SourcePort => 500,
DestPort => 500, # ISAKMP
%{$options->{ipchains}},
),
IPChains->new(
Rule => $target,
Prot => 50, # ESP
%{$options->{ipchains}},
),
);
}
sub block_rules {
my $self = shift;
my ( $target, $src, $src_if, $dst, $dst_if, $options ) = @_;
my ($control,$esp) = $self->prototypes( $target, $options );
block_udp_ruleset( $control, $src, $src_if, $dst, $dst_if );
block_ip_ruleset( $esp, $src, $src_if, $dst, $dst_if );
block_ip_ruleset( $esp, $dst, $dst_if, $src, $src_if );
}
sub accept_rules {
my $self = shift;
my ( $target, $src, $src_if, $dst, $dst_if, $options ) = @_;
my ($control, $esp ) = $self->prototypes( $target, $options );
my $masq = defined $options->{portfw} ? PORTFW :
$options->{masq} ? MASQ : NOMASQ;
accept_udp_ruleset( $control, $src, $src_if, $dst, $dst_if,
$masq, $options->{portfw} );
accept_ip_ruleset( $esp, $src, $src_if, $dst, $dst_if,
$masq, $options->{portfw} );
if ( $masq & MASQ ) {
$masq &= $masq ^ MASQ;
$masq |= UNMASQ;
} elsif ( $masq & PORTFW ) {
$masq &= $masq ^ PORTFW;
$masq |= UNPORTFW;
}
accept_ip_ruleset( $esp, $dst, $dst_if, $src, $src_if,
$masq, $options->{portfw} );
if ($options->{masq} || $options->{portfw} ) {
system ( "/sbin/modprobe", "ip_masq_ipsec" ) == 0
or carp __PACKAGE__, ": couldn't load ip_masq_ipsec: $?\n";
}
}
sub account_rules {
my $self = shift;
my ( $target, $src, $src_if, $dst, $dst_if, $options ) = @_;
my ( $control, $esp ) = $self->prototypes( $target, $options );
my $masq = defined $options->{portfw} ? PORTFW :
$options->{masq} ? MASQ : NOMASQ;
acct_udp_ruleset( $control, $src, $src_if, $dst, $dst_if,
$masq, $options->{portfw} );
acct_ip_ruleset( $esp, $src, $src_if, $dst, $dst_if,
$masq, $options->{portfw} );
if ( $masq & MASQ ) {
$masq &= $masq ^ MASQ;
$masq |= UNMASQ;
} elsif ( $masq & PORTFW ) {
$masq &= $masq ^ PORTFW;
$masq |= UNPORTFW;
}
acct_ip_ruleset( $esp, $dst, $dst_if, $src, $src_if,
$masq, $options->{portfw} );
}
sub valid_options {
my $self = shift;
( );
}
1;
=pod
=head1 NAME
Fwctl::Services::ipsec - Fwctl module to handle the IPSec protocol.
=head1 SYNOPSIS
accept ipsec -src INT_NET -dst REMOTE_IPSEC
=head1 DESCRIPTION
This module will implements the rules to accept/block/account the IPSec
tunnelling protocol. In order to be able to masquerade that protocol, you
will need a kernel with the IPSec masquerade patch applied.
See ftp://ftp.rubyriver.com/pub/jhardin/masquerade/ for informations.
=head1 AUTHOR
Francis J. Lacoste <francis.lacoste@iNsu.COM>
=head1 COPYRIGHT
Copyright (c) 1999,2000 iNsu Innovations Inc.
All rights reserved.
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.
=head1 SEE ALSO
fwctl(8) Fwctl(3) Fwctl::RuleSet(3)
=cut
|
