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package network::shorewall; # $Id$
use detect_devices;
use network::netconnect;
use run_program;
use common;
use log;
my @drakgw_ports = qw(domain bootps http https 631 imap pop3 smtp nntp ntp);
# Ports for CUPS (631), LPD/LPRng (515), SMB (137, 138, 139)
my @internal_ports = qw(631 515 137 138 139);
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() {
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 read() {
my %conf;
$conf{disabled} = !glob_("$::prefix/etc/rc3.d/S*shorewall");
$conf{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 $e->[1];
}
put_in_hash(\%conf, default_interfaces());
foreach (get_config_file('interfaces')) {
my ($name, $interface) = @$_;
if ($name eq 'masq') {
$conf{masquerade}{interface} = $interface;
$conf{loc_interface} = [ difference2($conf{loc_interface}, [$interface]) ];
}
}
$conf{net_interface} && \%conf;
}
sub write {
my ($conf) = @_;
my $connect_file = "/etc/sysconfig/network-scripts/net_cnx_up";
my %ports_by_proto;
foreach (split ' ', $conf->{ports}) {
m!^(\d+)/(udp|tcp)$! or die "bad port $_\n";
push @{$ports_by_proto{$2}}, $1;
}
set_config_file("zones",
[ 'net', 'Net', 'Internet zone' ],
if_($conf->{masquerade}, [ 'masq', 'Masquerade', 'Masquerade Local' ]),
if_($conf->{loc_interface}, [ 'loc', 'Local', 'Local' ]),
);
set_config_file('interfaces',
[ 'net', $conf->{net_interface}, 'detect' ],
$conf->{masquerade} ? [ 'masq', $conf->{masquerade}{interface}, 'detect' ] : (),
(map { [ 'loc', $_, 'detect' ] } @{$conf->{loc_interface} || []}),
);
set_config_file('policy',
if_($conf->{masquerade}, [ 'masq', 'net', 'ACCEPT' ]),
if_($conf->{loc_interface}, [ 'loc', 'net', '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_($conf->{masquerade}, 'masq'), if_($conf->{loc_interface}, 'loc'))),
if_($conf->{masquerade}, map { [ 'ACCEPT', 'masq', 'fw', $_, join(',', @drakgw_ports), '-' ] } 'tcp', 'udp'),
if_($conf->{masquerade}, map { [ 'ACCEPT', 'fw', 'masq', $_, join(',', @internal_ports), '-' ] } 'tcp', 'udp'),
);
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;
run_program::run('service', '>', '/dev/null', 'shorewall', 'clear') if $::isStandalone;
} else {
run_program::rooted($::prefix, 'chkconfig', '--add', 'shorewall');
run_program::run('service', '>', '/dev/null', 'shorewall', 'restart') if $::isStandalone;
}
}
1;
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