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gen-interface-policy-templates.pl
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gen-interface-policy-templates.pl
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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 ([email protected])
# Date: March 2009
# Description: Script to automatically generate per-interface firewall
# templates.
#
# Portions copyright by VyOS maintainers and contributors, 2015.
#
# **** End License ****
#
use strict;
use warnings;
# Set to 1 to enable debug output.
#
my $debug = 0;
# This hash maps the root of the tree of firewall templates for each interface
# into the variable reference that each of the node.def files in that tree
# will need to use to get the interface name. The keys of this hash are
# the partial pathname under the config template tree "interfaces/".
#
my %interface_hash = (
'bonding/node.tag' => '$VAR(../../@)',
'bonding/node.tag/vif-s/node.tag' => '$VAR(../../../@).$VAR(../../@)',
'bonding/node.tag/vif-s/node.tag/vif-c/node.tag' => '$VAR(../../../../@).$VAR(../../../@).$VAR(../../@)',
'bonding/node.tag/vif/node.tag' => '$VAR(../../../@).$VAR(../../@)',
'bridge/node.tag' => '$VAR(../../@)',
'bridge/node.tag/vif/node.tag' => '$VAR(../../../@).$VAR(../../@)',
'dummy/node.tag' => '$VAR(../../@)',
'ethernet/node.tag' => '$VAR(../../@)',
'ethernet/node.tag/vif-s/node.tag' => '$VAR(../../../@).$VAR(../../@)',
'ethernet/node.tag/vif-s/node.tag/vif-c/node.tag' => '$VAR(../../../../@).$VAR(../../../@).$VAR(../../@)',
'ethernet/node.tag/vif/node.tag' => '$VAR(../../../@).$VAR(../../@)',
'input/node.tag' => '$VAR(../../@)',
'l2tpv3/node.tag' => '$VAR(../../@)',
'multilink/node.tag/vif/node.tag' => '$VAR(../../../@)',
'macsec/node.tag' => '$VAR(../../@)',
'openvpn/node.tag' => '$VAR(../../@)',
'pppoe/node.tag' => '$VAR(../../@)',
'pseudo-ethernet/node.tag' => '$VAR(../../@)',
'pseudo-ethernet/node.tag/vif-s/node.tag' => '$VAR(../../../@).$VAR(../../@)',
'pseudo-ethernet/node.tag/vif-s/node.tag/vif-c/node.tag' => '$VAR(../../../../@).$VAR(../../../@).$VAR(../../@)',
'pseudo-ethernet/node.tag/vif/node.tag' => '$VAR(../../../@).$VAR(../../@)',
'tunnel/node.tag' => '$VAR(../../@)',
'vti/node.tag' => '$VAR(../../@)',
'vxlan/node.tag' => '$VAR(../../@)',
'wireless/node.tag' => '$VAR(../../@)',
'wireless/node.tag/vif/node.tag' => '$VAR(../../../@).$VAR(../../@)',
'wwan/node.tag' => '$VAR(../../@)',
'wireguard/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 = "policy";
# 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: $!";
print $tp "help: Policy route options\n";
close $tp
or die "Can't write $path/$node_file: $!";
}
# Map a firewall ruleset type into the string that we will use to describe
# it in help messages.
#
my %table_help_hash = (
"route" => "IPv4 policy route",
"ipv6-route" => "IPv6 policy route",
);
my %config_association_hash = (
"route" => "\"policy route\"",
"ipv6-route" => "\"policy ipv6-route\"",
);
# 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, $table, $if_name ) = @_;
if ($debug) {
print "debug: table=$table\n";
}
my $template_dir =
"${template_subdir}/${if_tree}/${firewall_subdir}/${table}";
if ($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}:$!";
print $tp <<EOF;
type: txt
priority: 615
help: $table_help_hash{$table} ruleset for interface
allowed: local -a params
eval "params=(\$(cli-shell-api listNodes policy $table))"
echo -n "\${params[@]}"
create: ifname=$if_name
sudo /opt/vyatta/sbin/vyatta-firewall.pl --update-interfaces \\
update \$ifname in \$VAR(@) $config_association_hash{$table}
update: ifname=$if_name
sudo /opt/vyatta/sbin/vyatta-firewall.pl --update-interfaces \\
update \$ifname in \$VAR(@) $config_association_hash{$table}
delete: ifname=$if_name
sudo /opt/vyatta/sbin/vyatta-firewall.pl --update-interfaces \\
delete \$ifname in \$VAR(@) $config_association_hash{$table}
EOF
close $tp
or die "Can't write ${template_dir}/${node_file}:$!";
}
print "Generating policy 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);
gen_template( $if_tree, "route", $if_name );
gen_template( $if_tree, "ipv6-route", $if_name );
}
print "Done.\n";