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#
# Module: Vyatta::VPNUtil.pm
#
# **** 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) 2005, 2006, 2007 Vyatta, Inc.
# All Rights Reserved.
#
# Author: Marat
# Date: 2007
# Description:
#
# **** End License ****
#
package Vyatta::VPN::Util;
use strict;
use warnings;
our @EXPORT = qw(rsa_get_local_key_file LOCAL_KEY_FILE_DEFAULT rsa_get_local_pubkey
rsa_convert_pubkey_pem is_vpn_running vpn_debug enableICMP is_tcp_udp
get_protocols conv_protocol);
use base qw(Exporter);
use Vyatta::Config;
use Crypt::OpenSSL::RSA;
use MIME::Base64;
use File::Copy;
use POSIX qw(strftime);
use constant LOCAL_KEY_FILE_DEFAULT
=> '/opt/vyatta/etc/config/ipsec.d/rsa-keys/localhost.key';
sub is_vpn_running {
return ( -e '/var/run/charon.ctl');
}
sub get_protocols {
my $cmd = "sudo cat /etc/protocols";
open(my $PROTOCOLS, "-|", $cmd);
my @protocols = [];
while(<$PROTOCOLS>){
push (@protocols, $_);
}
my %protohash = ();
foreach my $line (@protocols) {
next if ($line =~ /^\#/);
if ($line =~ /(\S+)\s+(\d+)\s+(\S+)\s+\#(.*)/){
my ($name, $number, $desc) = ($1,$2,$4);
if (not exists $protohash{$number}){
$protohash{$number} = {
_name => $name,
_number => $number,
_desc => $desc
};
}
}
}
return %protohash;
}
sub conv_protocol {
my $proto = pop(@_);
my %protohash = get_protocols();
foreach my $key (keys %protohash){
if ("$key" == "$proto") {
return $protohash{$key}->{_name};
}
}
return $proto;
}
sub is_tcp_udp {
my $protocol = pop @_;
return 1 if (($protocol eq '6') || ($protocol eq 'tcp') ||
($protocol eq '17') || ($protocol eq 'udp'));
return 0;
}
sub rsa_get_local_key_file {
my $file = LOCAL_KEY_FILE_DEFAULT;
#
# Read configuration tree
#
my $vc = new Vyatta::Config();
$vc->setLevel('vpn');
my $key_file_override = $vc->returnOrigValue('rsa-keys local-key file');
#
# We'll assume validation for valid path/file was handled in the
# commit.
#
$file = $key_file_override if defined($key_file_override);
return $file
}
sub rsa_get_local_pubkey {
my ($file) = @_;
open(my $dat, '<', $file)
or return 0;
my @raw_data=<$dat>;
close($dat);
# PEM encoded private key
my $rsa = Crypt::OpenSSL::RSA->new_private_key(join("", @raw_data));
if (defined $rsa) {
my ($n, $e) = $rsa->get_key_parameters();
my $eb = $e->to_bin();
return "0s" . encode_base64(pack("C", length($eb)) . $eb . $n->to_bin(), '');
}
# legacy private key format
foreach my $line (@raw_data) {
my $file_pubkey;
if (($file_pubkey) = ($line =~ m/\s+\#pubkey=(\S+)/)) {
# Found a legacy private key; convert to PEM for strongSwan 5.2.x
my $key = join("", @raw_data);
$key =~ /^\s+Modulus:\s+0x([0-9a-fA-F]+)$/m;
my $n = Crypt::OpenSSL::Bignum->new_from_hex($1);
$key =~ /^\s+PublicExponent:\s+0x([0-9a-fA-F]+)$/m;
my $e = Crypt::OpenSSL::Bignum->new_from_hex($1);
$key =~ /^\s+PrivateExponent:\s+0x([0-9a-fA-F]+)$/m;
my $d = Crypt::OpenSSL::Bignum->new_from_hex($1);
$key =~ /^\s+Prime1:\s+0x([0-9a-fA-F]+)$/m;
my $p = Crypt::OpenSSL::Bignum->new_from_hex($1);
$key =~ /^\s+Prime2:\s+0x([0-9a-fA-F]+)$/m;
my $q = Crypt::OpenSSL::Bignum->new_from_hex($1);
my $rsa = Crypt::OpenSSL::RSA->new_key_from_parameters($n, $e, $d, $p, $q);
if (defined $rsa) {
# write out PEM formatted key
move("$file", "$file.bak");
open(my $priv, '>', "$file")
or return 0;
chmod 0600, $file;
print {$priv} $rsa->get_private_key_string();
close($priv);
}
return $file_pubkey;
}
}
return 0;
}
sub rsa_convert_pubkey_pem {
my $key = shift;
my $decoded = decode_base64(substr($key, 2));
my $len = unpack("C", substr($decoded, 0, 1));
my $e = Crypt::OpenSSL::Bignum->new_from_bin(substr($decoded, 1, $len));
my $n = Crypt::OpenSSL::Bignum->new_from_bin(substr($decoded, 1 + $len));
my $rsa = Crypt::OpenSSL::RSA->new_key_from_parameters($n, $e);
return $rsa->get_public_key_x509_string();
}
sub vpn_debug {
my $timestamp = strftime("%Y%m%d-%H:%M.%S", localtime);
open my $log, '>>', "/var/log/vpn-debug.log"
or return;
print {$log} "$timestamp: ", @_ , "\n";
close $log;
}
sub vpn_log {
my ($msg) = @_;
open my $log, '>>', "/var/log/vyatta/ipsec.log"
or return;
my $timestamp = strftime("%Y-%m-%d %H:%M.%S", localtime);
print {$log} "$timestamp\nLog: $msg\n";
close $log;
}
sub vpn_system {
my ($cmdline) = @_;
vpn_debug("START $cmdline");
my $ret = system($cmdline);
if ($ret) {
vpn_debug("END ERROR $cmdline");
} else {
vpn_debug("END OK $cmdline");
}
}
sub enableICMP {
my ($enable) = @_;
opendir my $dir, '/proc/sys/net/ipv4/conf/'
or return;
my @nodes = grep !/^\./, readdir $dir;
closedir $dir;
foreach my $node (@nodes) {
open my $out, '>', "/proc/sys/net/ipv4/conf/$node/accept_redirects"
or return;
print {$out} $enable;
close $out;
open $out, '>', "/proc/sys/net/ipv4/conf/$node/send_redirects"
or return;
print {$out} $enable;
close $out;
}
return 1;
}
1;
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