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;