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#!/usr/bin/perl
#
# **** License ****
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# General Public License for more details.
#
# This code was originally developed by Vyatta, Inc.
# Portions created by Vyatta are Copyright (C) 2009 Vyatta, Inc.
# All Rights Reserved.
#
# Author: Bob Gilligan (gilligan@vyatta.com)
# Date: March 2009
# Description: Script to automatically generate per-interface firewall
# templates.
#
# **** End License ****
#
use strict;
use warnings;
# Set to 1 to enable debug output.
#
my $debug = 0;
# This hash maps the root of the tree of firewall templates for each interface
# into the variable reference that each of the node.def files in that tree
# will need to use to get the interface name. The keys of this hash are
# the partial pathname under the config template tree "interfaces/".
#
my %interface_hash = (
'adsl/node.tag/pvc/node.tag/bridged-ethernet' =>
'adsl$VAR(../../../../../@)',
'adsl/node.tag/pvc/node.tag/classical-ipoa' => 'adsl$VAR(../../../../../@)',
'adsl/node.tag/pvc/node.tag/pppoa/node.tag' => 'pppoa$VAR(../../../@)',
'adsl/node.tag/pvc/node.tag/pppoe/node.tag' => 'pppoe$VAR(../../../@)',
'bonding/node.tag' => '$VAR(../../../@)',
'bonding/node.tag/vif/node.tag' => '$VAR(../../../../@).$VAR(../../../@)',
'ethernet/node.tag' => '$VAR(../../../@)',
'ethernet/node.tag/pppoe/node.tag' => 'pppoe$VAR(../../../@)',
'ethernet/node.tag/vif/node.tag' => '$VAR(../../../../@).$VAR(../../../@)',
'ethernet/node.tag/vif/node.tag/pppoe/node.tag' => 'pppoe$VAR(../../../@)',
'virtual-ethernet/node.tag' => '$VAR(../../../@)',
'virtual-ethernet/node.tag/vif/node.tag' => '$VAR(../../../../@).$VAR(../../../@)',
'tunnel/node.tag' => '$VAR(../../../@)',
'bridge/node.tag' => '$VAR(../../../@)',
'openvpn/node.tag' => '$VAR(../../../@)',
'multilink/node.tag/vif/node.tag' => '$VAR(../../../../@)',
'serial/node.tag/cisco-hdlc/vif/node.tag' =>
'$VAR(../../../../../@).$VAR(../../../@)',
'serial/node.tag/frame-relay/vif/node.tag' =>
'$VAR(../../../../../@).$VAR(../../../@)',
'serial/node.tag/ppp/vif/node.tag' =>
'$VAR(../../../../../@).$VAR(../../../@)',
'wirelessmodem/node.tag' => '$VAR(../../../@)',
);
# The subdirectory where the generated templates will go
my $template_subdir = "generated-templates/interfaces";
# The name of the subdir under each interface holding the firewall tree
my $firewall_subdir = "firewall";
# The name of the config file we will be writing.
my $node_file = "node.def";
sub mkdir_p {
my $path = shift;
return 1 if ( mkdir($path) );
my $pos = rindex( $path, "/" );
return unless $pos != -1;
return unless mkdir_p( substr( $path, 0, $pos ) );
return mkdir($path);
}
# Generate the template file located at the root of the firewall tree
# under an interface. This template just provides a help message.
#
sub gen_firewall_template {
my ($if_tree) = @_;
my $path = "${template_subdir}/${if_tree}/${firewall_subdir}";
( -d $path ) or mkdir_p($path)
or die "Can't make directory $path: $!";
open my $tp, '>', "$path/$node_file"
or die "Can't create $path/$node_file: $!";
my $date = `date`;
print $tp "# Template generated at: $date\nhelp: Set firewall options\n";
close $tp
or die "Can't write $path/$node_file: $!";
}
# Map a firewall "direction" into a sub-string that we will use to compose
# the help message.
#
my %direction_help_hash = (
"in" => "forwarded packets on inbound interface",
"out" => "forwarded packets on outbound interface",
"local" => "packets destined for this router",
);
# Generate the template file located under the "direction" node in the
# firewall tree under an interface. This template just provides a help
# message.
#
sub gen_direction_template {
my ( $if_tree, $direction ) = @_;
my $path = "${template_subdir}/${if_tree}/${firewall_subdir}/${direction}";
( -d $path ) or mkdir_p($path)
or die "Can't make directory $path: $!";
open my $tp, '>', "$path/$node_file"
or die "Can't open $path/$node_file: $!";
my $date = `date`;
print $tp "# Template generated at: $date\n";
print $tp "help: Set ruleset for $direction_help_hash{$direction}\n";
close $tp
or die "Can't write $path/$node_file: $!";
}
# Map a firewall "direction" into the term we will use for it in help
# messages.
#
my %direction_term_hash = (
"in" => "inbound",
"out" => "outbound",
"local" => "local",
);
# Map a firewall ruleset type into the string that we will use to describe
# it in help messages.
#
my %table_help_hash = (
"name" => "IPv4 firewall",
"ipv6-name" => "IPv6 firewall",
"modify" => "IPv4 modify",
"ipv6-modify" => "IPv6 modify",
);
# Generate the template file at the leaf of the per-interface firewall tree.
# This template contains all the code to activate or deactivate a firewall
# ruleset on an interface for a particular ruleset type and direction.
#
sub gen_template {
my ( $if_tree, $direction, $table, $if_name ) = @_;
if ($debug) {
print "debug: table=$table direction=$direction\n";
}
my $template_dir =
"${template_subdir}/${if_tree}/${firewall_subdir}/${direction}/${table}";
if ($debug) {
print "debug: template_dir=$template_dir\n";
}
( -d $template_dir) or mkdir_p($template_dir)
or die "Can't make directory $template_dir: $!";
open my $tp, '>', "${template_dir}/${node_file}"
or die "Can't open ${template_dir}/${node_file}:$!";
my $date = `date`;
print $tp <<EOF;
# Template generated at: $date
type: txt
help: Set $direction_term_hash{$direction} $table_help_hash{$table} ruleset name for interface
allowed: local -a params
params=( /opt/vyatta/config/active/firewall/${table}/* )
echo -n \${params[@]##*/}
create: ifname=$if_name
sudo /opt/vyatta/sbin/vyatta-firewall.pl --update-interfaces \\
update \$ifname $direction \$VAR(@) $table
update: ifname=$if_name
sudo /opt/vyatta/sbin/vyatta-firewall.pl --update-interfaces \\
update \$ifname $direction \$VAR(@) $table
delete: ifname=$if_name
sudo /opt/vyatta/sbin/vyatta-firewall.pl --update-interfaces \\
delete \$ifname $direction \$VAR(@) $table
EOF
close $tp
or die "Can't write ${template_dir}/${node_file}:$!";
}
# The firewall ruleset types
my @ruleset_tables = ( "name", "modify", "ipv6-name", "ipv6-modify" );
# The firewall "directions"
my @ruleset_directions = ( "in", "out", "local" );
print "Generating interface templates...\n";
foreach my $if_tree ( keys %interface_hash ) {
my $if_name = $interface_hash{$if_tree};
if ($debug) {
print "debug: if_tree=$if_tree if_name=$if_name \n";
}
gen_firewall_template($if_tree);
for my $direction (@ruleset_directions) {
gen_direction_template( $if_tree, $direction );
foreach my $table (@ruleset_tables) {
if (($direction eq "local") &&
(($table eq "modify") || ($table eq "ipv6-modify"))) {
# modify type rules are not used for local traffic
next;
}
gen_template( $if_tree, $direction, $table, $if_name );
}
}
}
print "Done.\n";
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