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package AdminPanel::Shared::Shorewall; # $Id: shorewall.pm 254244 2009-03-18 22:54:32Z eugeni $
use detect_devices;
use network::network;
use AdminPanel::Shared::RunProgram;
use AdminPanel::Shared::Services;
use MDK::Common::Func qw(if_ partition map_each);
use MDK::Common::File qw(cat_ substInFile output_with_perm);
use MDK::Common::Various qw(to_bool);
use MDK::Common::DataStructure qw(is_empty_array_ref);
use List::Util qw(any);
use List::MoreUtils qw(uniq);
use log;
my $shorewall_root = "/etc/shorewall";
sub check_iptables() {
-f "$::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, $ver, @l) = @_;
my $done;
substInFile {
my $last_line = /^#LAST LINE/ && $_;
if (!$done && ($last_line || eof)) {
$_ = join('', map { join("\t", @$_) . "\n" } @l);
$_ .= $last_line if $last_line;
$done = 1;
} else {
$_ = '' unless
/^#/ || $file eq 'rules' && /^SECTION/;
}
} "$::prefix${shorewall_root}${ver}/$file";
}
sub get_config_file {
my ($file, $o_ver) = @_;
map { [ split ' ' ] } grep { !/^#/ } cat_("$::prefix${shorewall_root}${o_ver}/$file");
}
# Note: Called from drakguard and drakfirewall.pm...
# Deliberately not adding shorewall6 support here for now
sub set_in_file {
my ($file, $enabled, @list) = @_;
my $done;
substInFile {
my $last_line = /^#LAST LINE/ && $_;
foreach my $l (@list) { s|^$l\n|| }
if (!$done && $enabled && ($last_line || eof)) {
$_ = join('', map { "$_\n" } @list);
$_ .= $last_line if $last_line;
$done = 1;
}
} "$::prefix${shorewall_root}/$file";
}
sub dev_to_shorewall {
my ($dev) = @_;
$dev =~ /^ippp/ && "ippp+" ||
$dev =~ /^ppp/ && "ppp+" ||
$dev;
}
sub get_net_zone_interfaces {
my ($interfacesfile, $_net, $all_intf) = @_;
if(ref($interfacesfile) eq "ARRAY")
{
#- read shorewall configuration first
my @interfaces = map { $_->[1] } grep { $_->[0] eq 'net' } $interfacesfile;
}
else
{
my @interfaces = undef;
}
#- else try to find the best interface available
@interfaces ? @interfaces : @{$all_intf || []};
}
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_ver) = @_;
my $ver = '';
$ver = $o_ver if $o_ver;
#- read old rules file if config is not moved to rules.drakx yet
my @rules = get_config_file(-f "$::prefix${shorewall_root}${ver}/rules.drakx" ? 'rules.drakx' : 'rules', $ver);
my $services = AdminPanel::Shared::Services->new();
my %conf = (disabled => !$services->starts_on_boot("shorewall${ver}"),
version => $ver,
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', $ver)) {
($conf{masq}{net_interface}, $conf{masq}{subnet}) = @$e;
}
my @policy = get_config_file('policy', $ver);
$conf{log_net_drop} = @policy ? (any { $_->[0] eq 'net' && $_->[1] eq 'all' && $_->[2] eq 'DROP' && $_->[3] } @policy) : 1;
return \%conf;
# get_zones has been moved to AdminPanel::Module::Firewall cause it requires
# user interaction thus it should be logically separated by shorewall
# get_zones(\%conf);
# get_config_file('zones', $ver) && \%conf;
# consequently, to read shorewall conf
# you have to do something like this now (within Module::Firewall)
# my $conf = AdminPanel::Shared::Shorewall::read_();
# OPTIONAL: my $self->get_zones(\$conf)
# my $shorewall = AdminPanel::Shared::Shorewall::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;
}
#=============================================================
=head2 write_
=head3 INPUT
$conf: HASH, contains the configuration to write
$action: Str, possible values are "keep" or "drop"
=head3 OUTPUT
0: requires user interaction
1: everything has been done
=head3 DESCRIPTION
This function stores the configuration for shorewall inside
the proper files.
=head3 NOTES
if write_ is called without the $action parameter it can return 0
(i.e. user interaction requested) when the firewall configuration
has been manually changed.
In that case the developer will have to handle this request by providing
two choices within the domain (keep | drop) and then recall write_ with
the choosen behaviour.
=cut
#=============================================================
sub write_ {
my ($conf, $action) = @_;
my $ver = $conf->{version} || '';
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 { $_ eq "INCLUDE\trules.drakx\n" } grep { !/^(#|SECTION)/ } cat_("$::prefix${shorewall_root}${ver}/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)) {
if(!defined($action) || AdminPanel::Shared::trim($action) eq "")
{
return 0; # user interaction requested
}
my %actions = (
keep => N("Keep custom rules"),
drop => N("Drop custom rules"),
);
#- 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), 'bridge') ];
};
set_config_file('zones', $ver,
if_($has_loc_zone, [ 'loc', 'ipv' . ($ver || '4') ]),
[ 'net', 'ipv' . ($ver || '4') ],
[ 'fw', 'firewall' ],
);
set_config_file('interfaces', $ver,
(map { $interface_settings->('net', $_) } @{$conf->{net_zone}}),
(map { $interface_settings->('loc', $_) } @{$conf->{loc_zone} || []}),
);
set_config_file('policy', $ver,
if_($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', $ver, [ 'INCLUDE', 'rules.drakx' ]);
}
output_with_perm("$::prefix${shorewall_root}${ver}/" . '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', $ver, if_(exists $conf->{masq}, [ $conf->{masq}{net_interface}, $conf->{masq}{subnet} ]));
my $services = AdminPanel::Shared::Services->new();
if ($conf->{disabled}) {
$services->disable('shorewall', $::isInstall);
run_program::rooted($::prefix, '/sbin/shorewall', 'clear') unless $::isInstall;
} else {
$services->enable('shorewall', $::isInstall);
}
return 1;
}
sub set_redirected_ports {
my ($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 ($o_intf) = @_;
if (!$o_intf || !member($o_intf, map { $_->[1] } get_config_file('interfaces'))) {
my $shorewall = AdminPanel::Shared::Shorewall::read_();
$shorewall && !$shorewall->{disabled} and AdminPanel::Shared::Shorewall::write_($shorewall);
}
if (!$o_intf || !member($o_intf, map { $_->[1] } get_config_file('interfaces', 6))) {
my $shorewall6 = AdminPanel::Shared::Shorewall::read_(undef, 6);
$shorewall6 && !$shorewall6->{disabled} and AdminPanel::Shared::Shorewall::write_($shorewall6);
}
}
1;
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