forked from extern/shorewall_code
ef44b4741a
git-svn-id: https://shorewall.svn.sourceforge.net/svnroot/shorewall/trunk@6255 fbd18981-670d-0410-9b5c-8dc0c1a9a2bb
355 lines
10 KiB
Perl
355 lines
10 KiB
Perl
#
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# Shorewall-perl 3.9 -- /usr/share/shorewall-perl/Shorewall/Interfaces.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 for processing the /etc/shorewall/interfaces
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# file. It also exports 'add_group_to_zone()' which other modules call to
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# alter zone membership.
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#
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package Shorewall::Interfaces;
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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 Shorewall::Zones;
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use strict;
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our @ISA = qw(Exporter);
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our @EXPORT = qw( add_group_to_zone
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validate_interfaces_file
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known_interface
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interface_is_optional
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find_interfaces_by_option
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get_interface_option
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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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# 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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# 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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#
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our @interfaces;
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our %interfaces;
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sub add_group_to_zone($$$$$)
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{
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my ($zone, $type, $interface, $networks, $options) = @_;
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my $typeref;
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my $interfaceref;
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my $arrayref;
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my $zoneref = $zones{$zone};
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my $zonetype = $zoneref->{type};
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my $ifacezone = $interfaces{$interface}{zone};
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$zoneref->{interfaces}{$interface} = 1;
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my @newnetworks;
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my @exclusions;
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my $new = \@newnetworks;
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my $switched = 0;
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$ifacezone = '' unless defined $ifacezone;
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for my $host ( @$networks ) {
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if ( substr( $host, 0, 1 ) eq '!' ) {
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fatal_error "Only one exclusion allowed in a host list" if $switched;
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$switched = 1;
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$host = substr( $host, 1 );
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$new = \@exclusions;
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}
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unless ( $switched ) {
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if ( $type eq $zonetype ) {
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fatal_error "Duplicate Host Group ($interface:$host) in zone $zone" if $ifacezone eq $zone;
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$ifacezone = $zone if $host eq ALLIPv4;
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}
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}
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push @$new, $switched ? "$interface:$host" : $host;
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}
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$zoneref->{options}{in_out}{routeback} = 1 if $options->{routeback};
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$typeref = ( $zoneref->{hosts} || ( $zoneref->{hosts} = {} ) );
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$interfaceref = ( $typeref->{$type} || ( $interfaceref = $typeref->{$type} = {} ) );
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$arrayref = ( $interfaceref->{$interface} || ( $interfaceref->{$interface} = [] ) );
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$zoneref->{options}{complex} = 1 if @$arrayref || ( @newnetworks > 1 ) || ( @exclusions );
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my %h;
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$h{options} = $options;
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$h{hosts} = \@newnetworks;
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$h{ipsec} = $type eq 'ipsec' ? 'ipsec' : 'none';
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push @{$zoneref->{exclusions}}, @exclusions;
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push @{$arrayref}, \%h;
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}
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#
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# Return a list of networks routed out of the passed interface
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#
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sub get_routed_networks ( $$ ) {
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my ( $interface , $error_message ) = @_;
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my @networks;
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if ( open IP , '-|' , "/sbin/ip route show dev $interface 2> /dev/null" ) {
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while ( my $route = <IP> ) {
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$route =~ s/^\s+//;
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my $network = ( split /\s+/, $route )[0];
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if ( $network eq 'default' ) {
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fatal_error $error_message if $error_message;
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warning_message "default route ignored on interface $interface";
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} else {
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my ( $address, $vlsm ) = split '/', $network;
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$vlsm = 32 unless defined $vlsm;
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push @networks, "$address/$vlsm";
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}
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}
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close IP
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}
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@networks;
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}
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#
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# Parse the interfaces file.
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#
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sub validate_interfaces_file()
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{
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use constant { SIMPLE_IF_OPTION => 1,
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BINARY_IF_OPTION => 2,
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ENUM_IF_OPTION => 3,
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MASK_IF_OPTION => 3,
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IF_OPTION_ZONEONLY => 4 };
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my %validoptions = (arp_filter => BINARY_IF_OPTION,
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arp_ignore => ENUM_IF_OPTION,
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blacklist => SIMPLE_IF_OPTION,
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detectnets => SIMPLE_IF_OPTION,
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dhcp => SIMPLE_IF_OPTION,
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maclist => SIMPLE_IF_OPTION,
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logmartians => BINARY_IF_OPTION,
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norfc1918 => SIMPLE_IF_OPTION,
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nosmurfs => SIMPLE_IF_OPTION,
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optional => SIMPLE_IF_OPTION,
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proxyarp => BINARY_IF_OPTION,
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routeback => SIMPLE_IF_OPTION + IF_OPTION_ZONEONLY,
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routefilter => BINARY_IF_OPTION,
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sourceroute => BINARY_IF_OPTION,
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tcpflags => SIMPLE_IF_OPTION,
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upnp => SIMPLE_IF_OPTION,
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);
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my $fn = open_file 'interfaces';
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my $first_entry = 1;
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while ( read_a_line ) {
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my ($zone, $interface, $networks, $options ) = split_line 2, 4, 'interfaces file';
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my $zoneref;
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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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if ( $zone eq '-' ) {
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$zone = '';
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} else {
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$zoneref = $zones{$zone};
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fatal_error "Unknown zone ($zone)" unless $zoneref;
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fatal_error "Firewall zone not allowed in ZONE column of interface record" if $zoneref->{type} eq 'firewall';
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}
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$networks = '' if $networks eq '-';
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$options = '' if $options eq '-';
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fatal_error "Duplicate Interface ($interface)" if $interfaces{$interface};
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fatal_error "Invalid Interface Name: $interface" if $interface =~ /:|^\+$/;
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my $wildcard = 0;
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if ( $interface =~ /\+$/ ) {
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$wildcard = 1;
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$interfaces{$interface}{root} = substr( $interface, 0, -1 );
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} else {
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$interfaces{$interface}{root} = $interface;
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}
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unless ( $networks eq '' || $networks eq 'detect' ) {
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for my $address ( split /,/, $networks ) {
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fatal_error 'Invalid BROADCAST address' unless $address =~ /^(\d+)\.(\d+)\.(\d+)\.(\d+)$/;
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}
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warning_message 'Shorewall no longer uses broadcast addresses in rule generation';
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}
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my $optionsref = {};
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my %options;
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if ( $options ) {
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for my $option (split ',', $options ) {
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next if $option eq '-';
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( $option, my $value ) = split /=/, $option;
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fatal_error "Invalid Interface option ($option)" unless my $type = $validoptions{$option};
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fatal_error "The \"$option\" option may not be specified on a multi-zone interface" if $type & IF_OPTION_ZONEONLY && ! $zone;
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$type &= MASK_IF_OPTION;
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if ( $type == SIMPLE_IF_OPTION ) {
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fatal_error "Option $option does not take a value" if defined $value;
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$options{$option} = 1;
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} elsif ( $type == BINARY_IF_OPTION ) {
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$value = 1 unless defined $value;
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fatal_error "Option value for $option must be 0 or 1" unless ( $value eq '0' || $value eq '1' );
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fatal_error "The $option option may not be used with a wild-card interface name" if $wildcard;
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$options{$option} = $value;
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} elsif ( $type == ENUM_IF_OPTION ) {
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fatal_error "The $option option may not be used with a wild-card interface name" if $wildcard;
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if ( $option eq 'arp_ignore' ) {
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if ( defined $value ) {
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if ( $value =~ /^[1-3,8]$/ ) {
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$options{arp_ignore} = $value;
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} else {
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fatal_error "Invalid value ($value) for arp_ignore";
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}
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} else {
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$options{arp_ignore} = 1;
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}
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} else {
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fatal_error "Internal Error in validate_interfaces_file";
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}
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}
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}
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$zoneref->{options}{in_out}{routeback} = 1 if $options{routeback};
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}
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$interfaces{$interface}{options} = $optionsref = \%options;
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push @interfaces, $interface;
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my @networks;
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if ( $options{detectnets} ) {
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fatal_error "'detectnets' not allowed with multi-zone interface" unless $zone;
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fatal_error "The 'detectnets' option may not be used with a wild-card interface name" if $wildcard;
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@networks = get_routed_networks( $interface, 'detectnets not allowed on interface with default route' );
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fatal_error "No routes through 'detectnets' interface $interface" unless @networks || $options{optional};
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} else {
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@networks = @allipv4;
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}
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add_group_to_zone( $zone, $zoneref->{type}, $interface, \@networks, $optionsref ) if $zone && @networks;
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$interfaces{$interface}{zone} = $zone; #Must follow the call to add_group_to_zone()
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progress_message " Interface \"$line\" Validated";
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}
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}
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#
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# Returns true if passed interface matches an entry in /etc/shorewall/interfaces
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#
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# If the passed name matches a wildcard, a entry for the name is added in %interfaces to speed up validation of other references to that name.
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#
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sub known_interface($)
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{
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my $interface = $_[0];
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return 1 if exists $interfaces{$interface};
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for my $i ( @interfaces ) {
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my $val = $interfaces{$i}{root};
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next if $val eq $i;
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my $len = length $val;
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if ( substr( $interface, 0, $len ) eq $val ) {
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#
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# Cache this result for future reference
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#
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$interfaces{$interface} = undef;
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return 1;
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}
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}
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0;
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}
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#
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# Return the 'optional' setting of the passed interface
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#
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sub interface_is_optional($) {
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my $optionsref = $interfaces{$_[0]}{options};
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$optionsref && $optionsref->{optional};
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}
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#
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# Returns reference to array of interfaces with the passed option
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#
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sub find_interfaces_by_option( $ ) {
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my $option = $_[0];
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my @ints = ();
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for my $interface ( @interfaces ) {
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my $optionsref = $interfaces{$interface}{options};
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if ( $optionsref && defined $optionsref->{$option} ) {
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push @ints , $interface
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}
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}
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\@ints;
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}
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#
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# Return the value of an option for an interface
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#
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sub get_interface_option( $$ ) {
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my ( $interface, $option ) = @_;
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$interfaces{$interface}{options}{$option};
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}
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1;
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