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package network::shorewall; # $Id$
use detect_devices;
use network::network;
use run_program;
use common;
use log;
my $shorewall_root = "/etc/shorewall";
our $firewall_icon = $::isInstall ? 'banner-security' : '/usr/share/mcc/themes/default/firewall-mdk.png';
sub check_iptables() {
-f "$::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${shorewall_root}/$file";
}
sub get_config_file {
my ($file) = @_;
map { [ split ' ' ] } grep { !/^#/ } cat_("$::prefix${shorewall_root}/$file");
}
sub set_in_file {
my ($file, $enabled, @list) = @_;
my $done;
substInFile {
foreach my $l (@list) { s|^$l\n|| }
if (!$done && $enabled && (/^#LAST LINE/ || eof)) {
$_ = join('', map { "$_\n" } @list) . $_;
$done = 1;
}
} "$::prefix/etc/shorewall/$file";
}
sub dev_to_shorewall {
my ($dev) = @_;
$dev =~ /^ippp/ && "ippp+" ||
$dev =~ /^ppp/ && "ppp+" ||
$dev;
}
sub get_net_zone_interfaces {
my ($_net, $all_intf) = @_;
#- read shorewall configuration first
my @interfaces = map { $_->[1] } grep { $_->[0] eq 'net' } get_config_file('interfaces');
#- else try to find the best interface available
@interfaces ? @interfaces : @{$all_intf || []};
}
sub get_zones {
my ($conf, $o_in) = @_;
my $net = {};
network::network::read_net_conf($net);
#- find all interfaces but alias interfaces
my @all_intf = grep { !/:/ } uniq(keys(%{$net->{ifcfg}}), detect_devices::get_net_interfaces());
my %net_zone = map { $_ => undef } @all_intf;
$net_zone{$_} = 1 foreach get_net_zone_interfaces($net, \@all_intf);
$o_in and $o_in->ask_from_({
title => N("Firewall configuration"),
icon => $firewall_icon,
messages => N("Please select the interfaces that will be protected by the firewall.
All interfaces directly connected to Internet should be selected,
while interfaces connected to a local network may be unselected.
Which interfaces should be protected?
"),
}, [
map {
{ text => network::tools::get_interface_description($net, $_), val => \$net_zone{$_}, type => 'bool' };
} (sort keys %net_zone) ]);
($conf->{net_zone}, $conf->{loc_zone}) = partition { $net_zone{$_} } keys %net_zone;
}
sub add_interface_to_net_zone {
my ($conf, $interface) = @_;
if (!member($interface, @{$conf->{net_zone}})) {
push @{$conf->{net_zone}}, $interface;
@{$conf->{loc_zone}} = grep { $_ ne $interface } @{$conf->{loc_zone}};
}
}
sub read {
my ($o_in) = @_;
#- read old rules file if config is not moved to rules.drakx yet
my @rules = get_config_file(-f "$::prefix${shorewall_root}/rules.drakx" ? 'rules.drakx' : 'rules');
my %conf = (disabled => !glob_("$::prefix/etc/rc3.d/S*shorewall"),
ports => join(' ', map {
my $e = $_;
map { "$_/$e->[3]" } split(',', $e->[4]);
} grep { $_->[0] eq 'ACCEPT' && $_->[1] eq 'net' } @rules),
);
push @{$conf{accept_local_users}{$_->[4]}}, $_->[8] foreach grep { $_->[0] eq 'ACCEPT+' } @rules;
$conf{redirects}{$_->[3]}{$_->[4]} = $_->[2] foreach grep { $_->[0] eq 'REDIRECT' } @rules;
if (my ($e) = get_config_file('masq')) {
($conf{masq}{net_interface}, $conf{masq}{subnet}) = @$e;
}
my @policy = get_config_file('policy');
$conf{log_net_drop} = @policy ? (any { $_->[0] eq 'net' && $_->[1] eq 'all' && $_->[2] eq 'DROP' && $_->[3] } @policy) : 1;
get_zones(\%conf, $o_in);
get_config_file('zones') && \%conf;
}
sub ports_by_proto {
my ($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 upgrade_to_shorewall3() {
#- the 'FW' option has been removed from shorewall.conf as of shorewall 3.0
my $ipsecfile_ok;
substInFile {
undef $_ if /^\s*FW=/;
if ((/^\s*IPSECFILE=/ || eof) && !$ipsecfile_ok) {
$ipsecfile_ok = 1;
$_ = "IPSECFILE=zones\n";
}
} "$::prefix${shorewall_root}/shorewall.conf";
}
sub write {
my ($conf, $o_in) = @_;
my $use_pptp = any { /^ppp/ && cat_("$::prefix/etc/ppp/peers/$_") =~ /pptp/ } @{$conf->{net_zone}};
my $ports_by_proto = ports_by_proto($conf->{ports});
my $has_loc_zone = to_bool(@{$conf->{loc_zone} || []});
my ($include_drakx, $other_rules) = partition { $_ eq "INCLUDE\trules.drakx\n" } grep { !/^#/ } cat_("$::prefix${shorewall_root}/rules");
#- warn if the config is already in rules.drakx and additionnal rules are configured
if (!is_empty_array_ref($include_drakx) && !is_empty_array_ref($other_rules)) {
my %actions = (
keep => N("Keep custom rules"),
drop => N("Drop custom rules"),
);
my $action = 'keep';
!$o_in || $o_in->ask_from_(
{
messages => N("Your firewall configuration has been manually edited and contains
rules that may conflict with the configuration that has just been set up.
What do you want to do?"),
title => N("Firewall"),
icon => 'banner-security',
},
[ { val => \$action, type => 'list', list => [ 'keep', 'drop' ], format => sub { $actions{$_[0]} } } ]) or return;
#- reset the rules files if the user has chosen to drop modifications
undef $include_drakx if $action eq 'drop';
}
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_($has_loc_zone, [ 'loc', 'ipv4' ]),
[ 'fw', 'firewall' ],
);
set_config_file('interfaces',
(map { $interface_settings->('net', $_) } @{$conf->{net_zone}}),
(map { $interface_settings->('loc', $_) } @{$conf->{loc_zone} || []}),
);
set_config_file('policy',
if_($has_loc_zone, [ 'loc', 'net', 'ACCEPT' ], [ 'loc', 'fw', 'ACCEPT' ], [ 'fw', 'loc', 'ACCEPT' ]),
[ 'fw', 'net', 'ACCEPT' ],
[ 'net', 'all', 'DROP', if_($conf->{log_net_drop}, 'info') ],
[ 'all', 'all', 'REJECT', 'info' ],
);
if (is_empty_array_ref($include_drakx)) {
#- make sure the rules.drakx config is read, erasing user modifications
set_config_file('rules', [ 'INCLUDE', 'rules.drakx' ]);
}
output_with_perm("$::prefix${shorewall_root}/" . 'rules.drakx', 0600, map { join("\t", @$_) . "\n" } (
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), '-' ] } %$ports_by_proto),
(map_each {
if_($::b, map { [ 'ACCEPT+', 'fw', 'net', 'tcp', $::a, '-', '-', '-', $_ ] } @{$::b});
} %{$conf->{accept_local_users}}),
(map {
my $proto = $_;
#- WARNING: won't redirect ports from the firewall system if a local zone exists
#- set redirect_fw_only to workaround
map_each {
map { [ 'REDIRECT', $_, $::b, $proto, $::a, '-' ] } 'fw', if_($has_loc_zone, 'loc');
} %{$conf->{redirects}{$proto}};
} keys %{$conf->{redirects}}),
));
set_config_file('masq', if_(exists $conf->{masq}, [ $conf->{masq}{net_interface}, $conf->{masq}{subnet} ]));
upgrade_to_shorewall3();
require services;
if ($conf->{disabled}) {
services::disable('shorewall', $::isInstall);
run_program::rooted($::prefix, '/sbin/shorewall', 'clear') unless $::isInstall;
} else {
services::enable('shorewall', $::isInstall);
}
}
sub set_redirected_ports {
my ($conf, $proto, $dest, @ports) = @_;
if (@ports) {
$conf->{redirects}{$proto}{$_} = $dest foreach @ports;
} else {
my $r = $conf->{redirects}{$proto};
@ports = grep { $r->{$_} eq $dest } keys %$r;
delete $r->{$_} foreach @ports;
}
}
sub update_interfaces_list {
my ($o_intf) = @_;
$o_intf && member($o_intf, map { $_->[1] } get_config_file('interfaces')) and return;
my $shorewall = network::shorewall::read();
$shorewall && !$shorewall->{disabled} and network::shorewall::write($shorewall);
}
1;
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