package network::shorewall; # $Id$ use detect_devices; use network::netconnect; use network::ethernet; use network::network; use run_program; use common; use log; sub check_iptables { my ($in) = @_; my $existing_config = -f "$::prefix/etc/sysconfig/iptables"; $existing_config ||= $::isStandalone && do { system('modprobe iptable_nat'); -x '/sbin/iptables' && listlength(`/sbin/iptables -t nat -nL`) > 8; }; !$existing_config || $in->ask_okcancel(N("Firewalling configuration detected!"), N("Warning! An existing firewalling configuration has been detected. You may need some manual fixes after installation.")); } sub set_config_file { my ($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 default_interfaces_silent { my ($_in) = @_; my %conf; my @l = detect_devices::getNet() or return; if (@l == 1) { $conf{net_interface} = $l[0]; } else { $conf{net_interface} = network::netconnect::get_net_device() || $l[0]; $conf{loc_interface} = [ grep { $_ ne $conf{net_interface} } @l ]; } \%conf; } sub default_interfaces { my ($in) = @_; my %conf; my $card_netconnect = network::netconnect::get_net_device() || "eth0"; defined $card_netconnect and log::l("[drakgw] Information from netconnect: ignore card $card_netconnect"); my @l = detect_devices::getNet() or return; 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+' }); $in->ask_from('', 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. "), [ { label => N("Net Device"), val => \$card_netconnect, list => [ sort keys %net_devices ], format => sub { $net_devices{$_[0]} || $_[0] }, not_edit => 0 } ]); $conf{net_interface} = $card_netconnect; $conf{loc_interface} = [ grep { $_ ne $conf{net_interface} } @l ]; \%conf; } sub read { my ($in, $mode) = @_; my %conf = (disabled => !glob_("$::prefix/etc/rc3.d/S*shorewall"), ports => join(' ', map { my $e = $_; map { "$_/$e->[3]" } split(',', $e->[4]); } grep { $_->[0] eq 'ACCEPT' && $_->[1] eq 'net' } get_config_file('rules')) ); if (my ($e) = get_config_file('masq')) { $conf{masquerade}{subnet} = $e->[1] if $e->[1]; } if ($mode eq 'silent') { put_in_hash(\%conf, default_interfaces_silent($in)); } else { put_in_hash(\%conf, default_interfaces($in)); } $conf{net_interface} && \%conf; } sub write { my ($conf) = @_; my $connect_file = "/etc/sysconfig/network-scripts/net_cnx_up"; my $squid_port = network::network::read_squid_conf()->{http_port}[0]; my %ports_by_proto; foreach (split ' ', $conf->{ports}) { m!^(\d+(:\d+)?)/(udp|tcp|icmp)$! or die "bad port $_\n"; push @{$ports_by_proto{$3}}, $1; } set_config_file("zones", [ 'net', 'Net', 'Internet zone' ], if_($conf->{loc_interface}[0], [ 'loc', 'Local', 'Local' ]), ); set_config_file('interfaces', [ 'net', $conf->{net_interface}, 'detect' ], (map { [ 'loc', $_, 'detect' ] } @{$conf->{loc_interface} || []}), ); set_config_file('policy', if_($conf->{loc_interface}[0], [ 'loc', 'net', 'ACCEPT' ], [ 'fw', 'loc', 'ACCEPT' ]), [ 'fw', 'net', 'ACCEPT' ], [ 'net', 'all', 'DROP', 'info' ], [ 'all', 'all', 'REJECT', 'info' ], ); set_config_file('rules', if_(cat_("$::prefix$connect_file") =~ /pptp/, [ 'ACCEPT', 'fw', 'loc:10.0.0.138', 'tcp', '1723' ]), if_(cat_("$::prefix$connect_file") =~ /pptp/, [ 'ACCEPT', 'fw', 'loc:10.0.0.138', 'gre' ]), (map { map_each { [ 'ACCEPT', $_, 'fw', $::a, join(',', @$::b), '-' ] } %ports_by_proto; } ('net', if_($conf->{loc_interface}[0], 'loc'))), ); if (cat_("/etc/shorewall/rules") !~ /^\s*REDIRECT\s*loc\s*$squid_port\s+(\S+)/mg && $squid_port && -f "/var/run/squid.pid" && grep { /Loc/i } cat_("/etc/shorewall/zones")) { substInFile { s/#LAST LINE -- ADD YOUR ENTRIES BEFORE THIS ONE -- DO NOT REMOVE/REDIRECT\tloc\t$squid_port\ttcp\twww\t-\nACCEPT\tfw\tnet\ttcp\twww\n#LAST LINE -- ADD YOUR ENTRIES BEFORE THIS ONE -- DO NOT REMOVE/; } "/etc/shorewall/rules"; } set_config_file('masq', $conf->{masquerade} ? [ $conf->{net_interface}, $conf->{masquerade}{subnet} ] : (), ); if ($conf->{disabled}) { run_program::rooted($::prefix, 'chkconfig', '--del', 'shorewall'); run_program::run('service', '>', '/dev/null', 'shorewall', 'stop') if $::isStandalone; } else { run_program::rooted($::prefix, 'chkconfig', '--add', 'shorewall'); run_program::run('service', '>', '/dev/null', 'shorewall', 'restart') if $::isStandalone; } } 1;