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git-svn-id: https://shorewall.svn.sourceforge.net/svnroot/shorewall/trunk@6518 fbd18981-670d-0410-9b5c-8dc0c1a9a2bb
400 lines
10 KiB
Perl
400 lines
10 KiB
Perl
#
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# Shorewall-perl 4.0 -- /usr/share/shorewall-perl/Shorewall/Zones.pm
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#
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# This program is under GPL [http://www.gnu.org/copyleft/gpl.htm]
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#
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# (c) 2007 - 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., 675 Mass Ave, Cambridge, MA 02139, USA
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#
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# This module contains the code which deals with /etc/shorewall/zones.
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#
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package Shorewall::Zones;
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require Exporter;
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use Shorewall::Common;
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use Shorewall::Config;
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use strict;
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our @ISA = qw(Exporter);
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our @EXPORT = qw( NOTHING
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NUMERIC
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NETWORK
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IPSECPROTO
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IPSECMODE
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determine_zones
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zone_report
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dump_zone_contents
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haveipseczones
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single_interface
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@zones
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%zones
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$firewall_zone
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%interfaces );
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our @EXPORT_OK = ();
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our @VERSION = 1.00;
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#
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# IPSEC Option types
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#
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use constant { NOTHING => 'NOTHING',
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NUMERIC => '0x[\da-fA-F]+|\d+',
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NETWORK => '\d+.\d+.\d+.\d+(\/\d+)?',
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IPSECPROTO => 'ah|esp|ipcomp',
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IPSECMODE => 'tunnel|transport'
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};
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#
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# Zone Table.
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#
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# @zones contains the ordered list of zones with sub-zones appearing before their parents.
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#
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# %zones{<zone1> => {type = > <zone type> 'firewall', 'ipv4', 'ipsec4';
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# options => { complex => 0|1
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# in_out => < policy match string >
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# in => < policy match string >
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# out => < policy match string >
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# }
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# parents => [ <parents> ] Parents, Children and interfaces are listed by name
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# children => [ <children> ]
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# interfaces => [ <interfaces> ]
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# bridge => <bridge>
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# hosts { <type> } => [ { <interface1> => { ipsec => 'ipsec'|'none'
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# options => { <option1> => <value1>
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# ...
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# }
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# hosts => [ <net1> , <net2> , ... ]
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# }
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# <interface2> => ...
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# }
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# ]
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# }
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# <zone2> => ...
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# }
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#
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# $firewall_zone names the firewall zone.
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#
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our @zones;
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our %zones;
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our $firewall_zone;
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#
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# Interface Table.
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#
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# @interfaces lists the interface names in the order that they appear in the interfaces file.
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#
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# %interfaces { <interface1> => { root => <name without trailing '+'>
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# broadcast => [ <bcast1>, ... ]
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# options => { <option1> = <val1> ,
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# ...
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# }
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# zone => <zone name>
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# }
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#
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our %interfaces;
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our %reservedName = ( all => 1,
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none => 1,
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SOURCE => 1,
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DEST => 1 );
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#
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# Parse the passed option list and return a reference to a hash as follows:
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#
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# => mss = <MSS setting>
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# => ipsec = <-m policy arguments to match options>
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#
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sub parse_zone_option_list($$)
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{
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my %validoptions = ( mss => NUMERIC,
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strict => NOTHING,
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next => NOTHING,
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reqid => NUMERIC,
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spi => NUMERIC,
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proto => IPSECPROTO,
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mode => IPSECMODE,
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"tunnel-src" => NETWORK,
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"tunnel-dst" => NETWORK,
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);
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#
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# Hash of options that have their own key in the returned hash.
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#
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my %key = ( mss => "mss" );
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my ( $list, $zonetype ) = @_;
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my %h;
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my $options = '';
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my $fmt;
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if ( $list ne '-' ) {
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for my $e ( split ',' , $list ) {
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my $val = undef;
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my $invert = '';
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if ( $e =~ /([\w-]+)!=(.+)/ ) {
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$val = $2;
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$e = $1;
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$invert = '! ';
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} elsif ( $e =~ /([\w-]+)=(.+)/ ) {
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$val = $2;
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$e = $1;
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}
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$fmt = $validoptions{$e};
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fatal_error "Invalid Option ($e)" unless $fmt;
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if ( $fmt eq NOTHING ) {
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fatal_error "Option \"$e\" does not take a value" if defined $val;
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} else {
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fatal_error "Missing value for option \"$e\"" unless defined $val;
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fatal_error "Invalid value ($val) for option \"$e\"" unless $val =~ /^($fmt)$/;
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}
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if ( $key{$e} ) {
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$h{$e} = $val;
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} else {
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fatal_error "The \"$e\" option may only be specified for ipsec zones" unless $zonetype eq 'ipsec4';
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$options .= $invert;
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$options .= "--$e ";
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$options .= "$val "if defined $val;
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}
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}
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}
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$h{ipsec} = $options ? "$options " : '';
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\%h;
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}
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#
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# Parse the zones file.
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#
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sub determine_zones()
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{
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my @z;
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my $fn = open_file 'zones';
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my $first_entry = 1;
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while ( read_a_line ) {
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if ( $first_entry ) {
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progress_message2 "$doing $fn...";
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$first_entry = 0;
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}
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my @parents;
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my ($zone, $type, $options, $in_options, $out_options ) = split_line 1, 5, 'zones file';
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if ( $zone =~ /(\w+):([\w,]+)/ ) {
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$zone = $1;
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@parents = split ',', $2;
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for my $p ( @parents ) {
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fatal_error "Invalid Parent List ($2)" unless $p;
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fatal_error "Unknown parent zone ($p)" unless $zones{$p};
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fatal_error 'Subzones of firewall zone not allowed' if $zones{$p}{type} eq 'firewall';
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push @{$zones{$p}{children}}, $zone;
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}
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}
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fatal_error "Invalid zone name: $zone" unless "\L$zone" =~ /^[a-z]\w*$/ && length $zone <= $globals{MAXZONENAMELENGTH};
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fatal_error "Invalid zone name: $zone" if $reservedName{$zone} || $zone =~ /^all2|2all$/;
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fatal_error( "Duplicate zone name: $zone\n" ) if $zones{$zone};
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$type = "ipv4" unless $type;
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if ( $type =~ /ipv4/i ) {
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$type = 'ipv4';
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} elsif ( $type =~ /^ipsec4?$/i ) {
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$type = 'ipsec4';
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} elsif ( $type =~ /^bport4?$/i ) {
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warning_message "Bridge Port zones should have a parent zone" unless @parents;
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$type = 'bport4';
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} elsif ( $type eq 'firewall' ) {
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fatal_error 'Firewall zone may not be nested' if @parents;
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fatal_error "Only one firewall zone may be defined: $zone" if $firewall_zone;
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$firewall_zone = $zone;
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$ENV{FW} = $zone;
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$type = "firewall";
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} elsif ( $type eq '-' ) {
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$type = 'ipv4';
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} else {
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fatal_error "Invalid zone type ($type)" ;
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}
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my %zone_hash;
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$options = '' if $options eq '-';
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$in_options = '' if $in_options eq '-';
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$out_options = '' if $out_options eq '-';
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$zone_hash{in_out} = parse_zone_option_list( $options || '', $type );
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$zone_hash{in} = parse_zone_option_list( $in_options || '', $type );
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$zone_hash{out} = parse_zone_option_list( $out_options || '', $type );
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$zone_hash{complex} = ($type eq 'ipsec4' || $options || $in_options || $out_options ? 1 : 0);
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$zones{$zone} = { type => $type,
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parents => \@parents,
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exclusions => [],
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bridge => '',
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options => \%zone_hash,
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interfaces => {} ,
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children => [] ,
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hosts => {}
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};
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push @z, $zone;
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}
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fatal_error "No firewall zone defined" unless $firewall_zone;
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my $pushed = 1;
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my %ordered;
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while ( $pushed )
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{
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$pushed = 0;
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ZONE:
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for my $zone ( @z ) {
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unless ( $ordered{$zone} ) {
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for my $child ( @{$zones{$zone}{children}} ) {
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next ZONE unless $ordered{$child};
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}
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$ordered{$zone} = 1;
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push @zones, $zone;
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$pushed = 1;
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}
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}
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}
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}
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#
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# Return true of we have any ipsec zones
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#
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sub haveipseczones() {
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for my $zoneref ( values %zones ) {
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return 1 if $zoneref->{type} eq 'ipsec4';
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}
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0;
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}
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#
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# Report about zones.
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#
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sub zone_report()
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{
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for my $zone ( @zones )
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{
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my $zoneref = $zones{$zone};
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my $hostref = $zoneref->{hosts};
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my $type = $zoneref->{type};
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my $optionref = $zoneref->{options};
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progress_message " $zone ($type)";
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my $printed = 0;
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if ( $hostref ) {
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for my $type ( sort keys %$hostref ) {
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my $interfaceref = $hostref->{$type};
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for my $interface ( sort keys %$interfaceref ) {
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my $arrayref = $interfaceref->{$interface};
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for my $groupref ( @$arrayref ) {
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my $hosts = $groupref->{hosts};
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if ( $hosts ) {
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my $grouplist = join ',', ( @$hosts );
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progress_message " $interface:$grouplist";
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$printed = 1;
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}
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}
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}
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}
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}
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warning_message "*** $zone is an EMPTY ZONE ***" unless $printed || $type eq 'firewall';
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}
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}
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sub dump_zone_contents()
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{
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for my $zone ( @zones )
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{
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my $zoneref = $zones{$zone};
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my $hostref = $zoneref->{hosts};
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my $type = $zoneref->{type};
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my $optionref = $zoneref->{options};
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my $exclusions = $zoneref->{exclusions};
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my $entry = "$zone $type";
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if ( $hostref ) {
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for my $type ( sort keys %$hostref ) {
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my $interfaceref = $hostref->{$type};
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for my $interface ( sort keys %$interfaceref ) {
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my $arrayref = $interfaceref->{$interface};
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for my $groupref ( @$arrayref ) {
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my $hosts = $groupref->{hosts};
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if ( $hosts ) {
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my $grouplist = join ',', ( @$hosts );
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$entry .= " $interface:$grouplist";
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}
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}
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}
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}
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}
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if ( @$exclusions ) {
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$entry .= ' exclude';
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for my $host ( @$exclusions ) {
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$entry .= " $host";
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}
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}
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emit_unindented $entry;
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}
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}
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#
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# If the passed zone is associated with a single interface, the name of the interface is returned. Otherwise, the funtion returns '';
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#
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sub single_interface( $ ) {
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my $zone = $_[0];
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my $zoneref = $zones{$zone};
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fatal_error "Internal Error in single_zone()" unless $zoneref;
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{
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no warnings;
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if ( %{$zoneref->{interfaces}} == 1 ) {
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( keys %{$zoneref->{interfaces}} )[0];
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} else {
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'';
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}
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}
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}
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1;
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