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467 lines
13 KiB
Perl
467 lines
13 KiB
Perl
#
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# Shorewall 4.4 -- /usr/share/shorewall/Shorewall/Nat.pm
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#
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# This program is under GPL [http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt]
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#
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# (c) 2007,2008,2009,2010,2011 - Tom Eastep (teastep@shorewall.net)
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#
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# Complete documentation is available at http://shorewall.net
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of Version 2 of the GNU General Public License
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# as published by the Free Software Foundation.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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#
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# This module contains code for dealing with the /etc/shorewall/masq,
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# /etc/shorewall/nat and /etc/shorewall/netmap files.
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#
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package Shorewall::Nat;
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require Exporter;
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use Shorewall::Config qw(:DEFAULT :internal);
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use Shorewall::IPAddrs;
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use Shorewall::Zones;
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use Shorewall::Chains qw(:DEFAULT :internal);
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use Shorewall::Providers qw( lookup_provider );
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use strict;
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our @ISA = qw(Exporter);
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our @EXPORT = qw( setup_masq setup_nat setup_netmap add_addresses );
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our @EXPORT_OK = ();
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our $VERSION = '4.4_20';
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my @addresses_to_add;
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my %addresses_to_add;
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#
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# Called by the compiler
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#
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sub initialize() {
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@addresses_to_add = ();
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%addresses_to_add = ();
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}
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#
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# Process a single rule from the the masq file
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#
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sub process_one_masq( )
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{
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my ($interfacelist, $networks, $addresses, $proto, $ports, $ipsec, $mark, $user ) = split_line1 2, 8, 'masq file';
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if ( $interfacelist eq 'COMMENT' ) {
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process_comment;
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return 1;
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}
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my $pre_nat;
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my $add_snat_aliases = $config{ADD_SNAT_ALIASES};
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my $destnets = '';
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my $baserule = '';
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#
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# Leading '+'
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#
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$pre_nat = 1 if $interfacelist =~ s/^\+//;
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#
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# Parse the remaining part of the INTERFACE column
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#
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if ( $interfacelist =~ /^([^:]+)::([^:]*)$/ ) {
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$add_snat_aliases = 0;
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$destnets = $2;
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$interfacelist = $1;
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} elsif ( $interfacelist =~ /^([^:]+:[^:]+):([^:]+)$/ ) {
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$destnets = $2;
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$interfacelist = $1;
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} elsif ( $interfacelist =~ /^([^:]+):$/ ) {
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$add_snat_aliases = 0;
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$interfacelist = $1;
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} elsif ( $interfacelist =~ /^([^:]+):([^:]*)$/ ) {
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my ( $one, $two ) = ( $1, $2 );
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if ( $2 =~ /\./ ) {
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$interfacelist = $one;
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$destnets = $two;
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}
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}
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#
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# If there is no source or destination then allow all addresses
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#
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$networks = ALLIPv4 if $networks eq '-';
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$destnets = ALLIPv4 if $destnets eq '-';
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#
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# Handle IPSEC options, if any
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#
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if ( $ipsec ne '-' ) {
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fatal_error "Non-empty IPSEC column requires policy match support in your kernel and iptables" unless have_capability( 'POLICY_MATCH' );
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if ( $ipsec =~ /^yes$/i ) {
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$baserule .= do_ipsec_options 'out', 'ipsec', '';
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} elsif ( $ipsec =~ /^no$/i ) {
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$baserule .= do_ipsec_options 'out', 'none', '';
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} else {
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$baserule .= do_ipsec_options 'out', 'ipsec', $ipsec;
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}
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} elsif ( have_ipsec ) {
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$baserule .= '-m policy --pol none --dir out ';
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}
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#
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# Handle Protocol and Ports
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#
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$baserule .= do_proto $proto, $ports, '';
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#
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# Handle Mark
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#
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$baserule .= do_test( $mark, $globals{TC_MASK} ) if $mark ne '-';
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$baserule .= do_user( $user ) if $user ne '-';
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for my $fullinterface (split_list $interfacelist, 'interface' ) {
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my $rule = '';
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my $target = 'MASQUERADE ';
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#
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# Isolate and verify the interface part
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#
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( my $interface = $fullinterface ) =~ s/:.*//;
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if ( $interface =~ /(.*)[(](\w*)[)]$/ ) {
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$interface = $1;
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my $provider = $2;
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$fullinterface =~ s/[(]\w*[)]//;
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my $realm = lookup_provider( $provider );
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fatal_error "$provider is not a shared-interface provider" unless $realm;
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$rule .= "-m realm --realm $realm ";
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}
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fatal_error "Unknown interface ($interface)" unless my $interfaceref = known_interface( $interface );
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unless ( $interfaceref->{root} ) {
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$rule .= match_dest_dev( $interface );
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$interface = $interfaceref->{name};
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}
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my $chainref = ensure_chain('nat', $pre_nat ? snat_chain $interface : masq_chain $interface);
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my $detectaddress = 0;
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my $exceptionrule = '';
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my $randomize = '';
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my $persistent = '';
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my $conditional = 0;
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#
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# Parse the ADDRESSES column
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#
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if ( $addresses ne '-' ) {
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if ( $addresses eq 'random' ) {
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$randomize = '--random ';
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} else {
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$addresses =~ s/:persistent$// and $persistent = '--persistent ';
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$addresses =~ s/:random$// and $randomize = '--random ';
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require_capability 'PERSISTENT_SNAT', ':persistent', 's' if $persistent;
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if ( $addresses =~ /^SAME/ ) {
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fatal_error "The SAME target is no longer supported";
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} elsif ( $addresses eq 'detect' ) {
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my $variable = get_interface_address $interface;
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$target = "SNAT --to-source $variable";
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if ( interface_is_optional $interface ) {
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add_commands( $chainref,
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'',
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"if [ \"$variable\" != 0.0.0.0 ]; then" );
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incr_cmd_level( $chainref );
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$detectaddress = 1;
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}
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} elsif ( $addresses eq 'NONAT' ) {
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$target = 'RETURN';
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$add_snat_aliases = 0;
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} else {
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my $addrlist = '';
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for my $addr ( split_list $addresses , 'address' ) {
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if ( $addr =~ /^&(.+)$/ ) {
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$target = 'SNAT ';
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if ( $conditional = conditional_rule( $chainref, $addr ) ) {
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$addrlist .= '--to-source ' . get_interface_address $1;
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} else {
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$addrlist .= '--to-source ' . record_runtime_address $1;
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}
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} elsif ( $addr =~ /^.*\..*\..*\./ ) {
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$target = 'SNAT ';
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my ($ipaddr, $rest) = split ':', $addr;
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if ( $ipaddr =~ /^(.+)-(.+)$/ ) {
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validate_range( $1, $2 );
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} else {
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validate_address $ipaddr, 0;
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}
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$addrlist .= "--to-source $addr ";
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$exceptionrule = do_proto( $proto, '', '' ) if $addr =~ /:/;
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} else {
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my $ports = $addr;
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$ports =~ s/^://;
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my $portrange = $ports;
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$portrange =~ s/-/:/;
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validate_portpair( $proto, $portrange );
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$addrlist .= "--to-ports $ports ";
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$exceptionrule = do_proto( $proto, '', '' );
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}
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}
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$target .= $addrlist;
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}
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}
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$target .= $randomize;
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$target .= $persistent;
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} else {
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$add_snat_aliases = 0;
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}
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#
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# And Generate the Rule(s)
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#
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expand_rule( $chainref ,
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POSTROUTE_RESTRICT ,
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$baserule . $rule ,
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$networks ,
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$destnets ,
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'' ,
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$target ,
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'' ,
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'' ,
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$exceptionrule );
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conditional_rule_end( $chainref ) if $detectaddress || $conditional;
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if ( $add_snat_aliases ) {
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my ( $interface, $alias , $remainder ) = split( /:/, $fullinterface, 3 );
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fatal_error "Invalid alias ($alias:$remainder)" if defined $remainder;
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for my $address ( split_list $addresses, 'address' ) {
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my ( $addrs, $port ) = split /:/, $address;
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next unless $addrs;
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next if $addrs eq 'detect';
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for my $addr ( ip_range_explicit $addrs ) {
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unless ( $addresses_to_add{$addr} ) {
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$addresses_to_add{$addr} = 1;
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if ( defined $alias ) {
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push @addresses_to_add, $addr, "$interface:$alias";
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$alias++;
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} else {
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push @addresses_to_add, $addr, $interface;
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}
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}
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}
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}
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}
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}
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progress_message " Masq record \"$currentline\" $done";
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}
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#
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# Process the masq file
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#
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sub setup_masq()
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{
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if ( my $fn = open_file 'masq' ) {
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first_entry( sub { progress_message2 "$doing $fn..."; require_capability 'NAT_ENABLED' , 'a non-empty masq file' , 's'; } );
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process_one_masq while read_a_line;
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clear_comment;
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}
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}
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#
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# Validate the ALL INTERFACES or LOCAL column in the NAT file
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#
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sub validate_nat_column( $$ ) {
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my $ref = $_[1];
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my $val = $$ref;
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if ( defined $val ) {
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unless ( ( $val = "\L$val" ) eq 'yes' ) {
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if ( ( $val eq 'no' ) || ( $val eq '-' ) ) {
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$$ref = '';
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} else {
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fatal_error "Invalid value ($val) for $_[0]";
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}
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}
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} else {
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$$ref = '';
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}
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}
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#
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# Process a record from the NAT file
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#
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sub do_one_nat( $$$$$ )
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{
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my ( $external, $fullinterface, $internal, $allints, $localnat ) = @_;
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my ( $interface, $alias, $remainder ) = split( /:/, $fullinterface, 3 );
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fatal_error "Invalid alias ($alias:$remainder)" if defined $remainder;
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sub add_nat_rule( $$ ) {
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add_rule ensure_chain( 'nat', $_[0] ) , $_[1];
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}
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my $add_ip_aliases = $config{ADD_IP_ALIASES};
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my $policyin = '';
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my $policyout = '';
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my $rulein = '';
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my $ruleout = '';
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fatal_error "Unknown interface ($interface)" unless my $interfaceref = known_interface( $interface );
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unless ( $interfaceref->{root} ) {
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$rulein = match_source_dev $interface;
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$ruleout = match_dest_dev $interface;
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$interface = $interfaceref->{name};
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}
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if ( have_ipsec ) {
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$policyin = ' -m policy --pol none --dir in';
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$policyout = '-m policy --pol none --dir out';
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}
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fatal_error "Invalid nat file entry" unless defined $interface && defined $internal;
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if ( $add_ip_aliases ) {
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$add_ip_aliases = '' if defined( $alias ) && $alias eq '';
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}
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validate_nat_column 'ALL INTERFACES', \$allints;
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validate_nat_column 'LOCAL' , \$localnat;
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if ( $allints ) {
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add_nat_rule 'nat_in' , "-d $external $policyin -j DNAT --to-destination $internal";
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add_nat_rule 'nat_out' , "-s $internal $policyout -j SNAT --to-source $external";
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} else {
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add_nat_rule input_chain( $interface ) , $rulein . "-d $external $policyin -j DNAT --to-destination $internal";
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add_nat_rule output_chain( $interface ) , $ruleout . "-s $internal $policyout -j SNAT --to-source $external";
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}
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add_nat_rule 'OUTPUT' , "-d $external $policyout -j DNAT --to-destination $internal " if $localnat;
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if ( $add_ip_aliases ) {
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unless ( $addresses_to_add{$external} ) {
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$addresses_to_add{$external} = 1;
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push @addresses_to_add, ( $external , $fullinterface );
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}
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}
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}
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#
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# Process NAT file
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#
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sub setup_nat() {
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if ( my $fn = open_file 'nat' ) {
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first_entry( sub { progress_message2 "$doing $fn..."; require_capability 'NAT_ENABLED' , 'a non-empty nat file' , 's'; } );
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while ( read_a_line ) {
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my ( $external, $interfacelist, $internal, $allints, $localnat ) = split_line1 3, 5, 'nat file';
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if ( $external eq 'COMMENT' ) {
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process_comment;
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} else {
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( $interfacelist, my $digit ) = split /:/, $interfacelist;
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$digit = defined $digit ? ":$digit" : '';
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for my $interface ( split_list $interfacelist , 'interface' ) {
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fatal_error "Invalid Interface List ($interfacelist)" unless defined $interface && $interface ne '';
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do_one_nat $external, "${interface}${digit}", $internal, $allints, $localnat;
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}
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progress_message " NAT entry \"$currentline\" $done";
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}
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}
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clear_comment;
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}
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}
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#
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# Setup Network Mapping
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#
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sub setup_netmap() {
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if ( my $fn = open_file 'netmap' ) {
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first_entry( sub { progress_message2 "$doing $fn..."; require_capability 'NAT_ENABLED' , 'a non-empty netmap file' , 's'; } );
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while ( read_a_line ) {
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my ( $type, $net1, $interfacelist, $net2, $net3 ) = split_line 4, 5, 'netmap file';
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$net3 = ALLIP if $net3 eq '-';
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for my $interface ( split_list $interfacelist, 'interface' ) {
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my $rulein = '';
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my $ruleout = '';
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my $iface = $interface;
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fatal_error "Unknown interface ($interface)" unless my $interfaceref = known_interface( $interface );
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unless ( $interfaceref->{root} ) {
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$rulein = match_source_dev( $interface );
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$ruleout = match_dest_dev( $interface );
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$interface = $interfaceref->{name};
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}
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if ( $type eq 'DNAT' ) {
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add_rule ensure_chain( 'nat' , input_chain $interface ) , $rulein . match_source_net( $net3 ) . "-d $net1 -j NETMAP --to $net2";
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} elsif ( $type eq 'SNAT' ) {
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add_rule ensure_chain( 'nat' , output_chain $interface ) , $ruleout . match_dest_net( $net3 ) . "-s $net1 -j NETMAP --to $net2";
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} else {
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fatal_error "Invalid type ($type)";
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}
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progress_message " Network $net1 on $iface mapped to $net2 ($type)";
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}
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}
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clear_comment;
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}
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}
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sub add_addresses () {
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if ( @addresses_to_add ) {
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my @addrs = @addresses_to_add;
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my $arg = '';
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my $addresses = 0;
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while ( @addrs ) {
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my $addr = shift @addrs;
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my $interface = shift @addrs;
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$arg = "$arg $addr $interface";
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unless ( $config{RETAIN_ALIASES} ) {
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emit '' unless $addresses++;
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$interface =~ s/:.*//;
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emit "del_ip_addr $addr $interface";
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}
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}
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emit "\nadd_ip_aliases $arg";
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}
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}
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1;
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