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package network::shorewall; # $Id$
use detect_devices;
use network::ethernet;
use network::network;
use run_program;
use common;
use log;
sub check_iptables() {
-f "$::prefix/etc/sysconfig/iptables" ||
$::isStandalone && do {
system('modprobe iptable_nat');
-x '/sbin/iptables' && listlength(`/sbin/iptables -t nat -nL`) > 8;
};
}
sub set_config_file {
my ($file, @l) = @_;
my $done;
substInFile {
if (!$done && (/^#LAST LINE/ || eof)) {
$_ = join('', map { join("\t", @$_) . "\n" } @l) . $_;
$done = 1;
} else {
$_ = '' if /^[^#]/;
}
} "$::prefix/etc/shorewall/$file";
}
sub get_config_file {
my ($file) = @_;
map { [ split ' ' ] } grep { !/^#/ } cat_("$::prefix/etc/shorewall/$file");
}
sub get_ifcfg_interface() {
my $net = {};
network::network::read_net_conf($net);
network::tools::get_default_gateway_interface($net);
}
sub get_shorewall_interface() {
#- read shorewall configuration first
foreach (get_config_file('interfaces')) {
$_->[0] eq 'net' and return $_->[1];
}
#- else try to find the best interface available
my $default_dev = get_ifcfg_interface();
$default_dev =~ /^ippp/ && "ippp+" ||
$default_dev =~ /^ppp/ && "ppp+" ||
$default_dev;
}
our $ask_shorewall_interface_label = N_("Please enter the name of the interface connected to the internet.
Examples:
ppp+ for modem or DSL connections,
eth0, or eth1 for cable connection,
ippp+ for a isdn connection.
");
sub shorewall_interface_choices {
my ($refval) = @_;
my $modules_conf = modules::any_conf->read;
my @all_cards = network::ethernet::get_eth_cards($modules_conf);
my %net_devices = network::ethernet::get_eth_cards_names(@all_cards);
put_in_hash(\%net_devices, { 'ppp+' => 'ppp+', 'ippp+' => 'ippp+' });
[ { label => N("Net Device"), val => $refval, list => [ sort keys %net_devices ], format => sub { $net_devices{$_[0]} || $_[0] }, not_edit => 0 } ];
}
sub read_default_interfaces {
my ($conf, $o_in) = @_;
my $interface = get_shorewall_interface();
$o_in and $o_in->ask_from('', translate($ask_shorewall_interface_label), shorewall_interface_choices(\$interface));
set_net_interface($conf, $interface);
}
sub set_net_interface {
my ($conf, $interface) = @_;
$conf->{net_interface} = $interface;
#- keep all other interfaces (but alias interfaces) in local zone
$conf->{loc_interface} = [ grep { !/:/ && $_ ne $interface } detect_devices::getNet() ];
}
sub read {
my ($o_in) = @_;
my @rules = get_config_file('rules');
my %conf = (disabled => !glob_("$::prefix/etc/rc3.d/S*shorewall"),
ports => join(' ', map {
my $e = $_;
map { "$_/$e->[3]" } split(',', $e->[4]);
} grep { $_->[0] eq 'ACCEPT' && $_->[1] eq 'net' } @rules),
);
$conf{redirects}{$_->[3]}{$_->[2]} = $_->[4] foreach grep { $_->[0] eq 'REDIRECT' } @rules;
if (my ($e) = get_config_file('masq')) {
$conf{masq_subnet} = $e->[1];
}
read_default_interfaces(\%conf, $o_in);
$conf{net_interface} && \%conf;
}
sub ports_by_proto {
my ($ports) = @_;
my %ports_by_proto;
foreach (split ' ', $ports) {
m!^(\d+(?::\d+)?)/(udp|tcp|icmp)$! or die "bad port $_\n";
push @{$ports_by_proto{$2}}, $1;
}
\%ports_by_proto;
}
sub write {
my ($conf) = @_;
my $default_intf = get_ifcfg_interface();
my $use_pptp = $default_intf =~ /^ppp/ && cat_("$::prefix/etc/ppp/peers/$default_intf") =~ /pptp/;
my $ports_by_proto = ports_by_proto($conf->{ports});
my $interface_settings = sub {
my ($zone, $interface) = @_;
[ $zone, $interface, 'detect', if_(detect_devices::is_bridge_interface($interface), 'routeback') ];
};
set_config_file("zones",
[ 'net', 'ipv4' ],
if_($conf->{loc_interface}[0], [ 'loc', 'ipv4' ]),
[ 'fw', 'firewall' ],
);
set_config_file('interfaces',
$interface_settings->('net', $conf->{net_interface}),
(map { $interface_settings->('loc', $_) } @{$conf->{loc_interface} || []}),
);
set_config_file('policy',
if_($conf->{loc_interface}[0], [ 'loc', 'net', 'ACCEPT' ], [ 'loc', 'fw', 'ACCEPT' ], [ 'fw', 'loc', 'ACCEPT' ]),
[ 'fw', 'net', 'ACCEPT' ],
[ 'net', 'all', 'DROP', 'info' ],
[ 'all', 'all', 'REJECT', 'info' ],
);
set_config_file('rules',
if_($use_pptp, [ 'ACCEPT', 'fw', 'loc:10.0.0.138', 'tcp', '1723' ]),
if_($use_pptp, [ 'ACCEPT', 'fw', 'loc:10.0.0.138', 'gre' ]),
(map_each { [ 'ACCEPT', 'net', 'fw', $::a, join(',', @$::b), '-' ] } %$ports_by_proto),
(map {
map_each { [ 'REDIRECT', 'loc', $::a, $_, $::b, '-' ] } %{$conf->{redirects}{$_}};
} keys %{$conf->{redirects}}),
);
set_config_file('masq', if_($conf->{masq_subnet}, [ $conf->{net_interface}, $conf->{masq_subnet} ]));
require services;
if ($conf->{disabled}) {
services::disable('shorewall', $::isInstall);
run_program::rooted($::prefix, '/sbin/shorewall', 'clear') unless $::isInstall;
} else {
services::enable('shorewall', $::isInstall);
}
}
1;
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