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#!/usr/local/bin/php-cgi -f
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<?php
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/*
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* openvpn.tls-verify.php
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*
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* part of pfSense (https://www.pfsense.org)
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* Copyright (c) 2011-2013 BSD Perimeter
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* Copyright (c) 2013-2016 Electric Sheep Fencing
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* Copyright (c) 2014-2022 Rubicon Communications, LLC (Netgate)
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* All rights reserved.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/*
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* OpenVPN calls this script to validate a certificate
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* This script is called ONCE per DEPTH of the certificate chain
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* Normal operation would have two runs - one for the server certificate
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* and one for the client certificate. Beyond that, you're dealing with
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* intermediates.
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*/
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require_once("globals.inc");
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require_once("config.inc");
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require_once("interfaces.inc");
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openlog("openvpn", LOG_ODELAY, LOG_AUTH);
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/* read data from command line */
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if (isset($_GET['certdepth'])) {
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$cert_depth = $_GET['certdepth'];
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$cert_subject = urldecode($_GET['certsubject']);
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$allowed_depth = $_GET['depth'];
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$server_cn = $_GET['servercn'];
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} else {
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$cert_depth = intval($argv[1]);
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$cert_subject = $argv[2];
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}
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syslog(LOG_WARNING, "Certificate Depth {$cert_depth}");
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syslog(LOG_WARNING, "Certificate Subject {$cert_subject}");
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syslog(LOG_WARNING, "Certificate Allowed Depth {$allowed_depth}");
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syslog(LOG_WARNING, "Certificate Server CN {$server_cn}");
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syslog(LOG_WARNING, "Certificate Serial {$_GET['serial']}");
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syslog(LOG_WARNING, "Current Config {$_GET['config']}");
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/* Reserved for future use in case we decide to verify CNs and such as well
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$subj = explode("/", $cert_subject);
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foreach ($subj at $s) {
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list($n, $v) = explode("=", $s);
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if ($n == "CN") {
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$common_name = $v;
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}
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}
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*/
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/* Replaced by sed with proper variables used below ( $server_cn and $allowed_depth ). */
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//<template>
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if (isset($allowed_depth) && ($cert_depth > $allowed_depth)) {
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syslog(LOG_WARNING, "Certificate depth {$cert_depth} exceeded max allowed depth of {$allowed_depth}.");
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if (isset($_GET['certdepth'])) {
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echo "FAILED";
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closelog();
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return;
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} else {
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closelog();
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exit(1);
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}
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}
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syslog(LOG_WARNING, "Current config {$_GET['config']}");
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preg_match('/\/var\/etc\/openvpn\/server(\d+)\/config\.ovpn/', $_GET['config'], $current_vpnid);
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$current_vpnid_str = implode(" ", $current_vpnid);
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syslog(LOG_WARNING, "Current VPN ID {$current_vpnid_str}");
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$iteration = 1;
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foreach ($config['openvpn']['openvpn-server'] as $ovpns) {
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syslog(LOG_WARNING, "Iteration {$iteration}");
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$ovpns_str = implode(",",$ovpns);
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syslog(LOG_WARNING, "OpenVPN Configuration {$ovpns_str}");
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if (($ovpns['vpnid'] == $current_vpnid['1']) && ($ovpns['ocspcheck'] == 'yes')) {
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$capath = "/var/etc/openvpn/server{$ovpns['vpnid']}/ca/";
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$ca = lookup_ca($ovpns['caref']);
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$cert_contents = base64_decode($ca['crt']);
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$cert_details = openssl_x509_parse($cert_contents);
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$issuer = $capath . $cert_details['hash'] . ".0";
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$serial = $_GET['serial'];
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$status_out = null;
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$status = exec("/usr/bin/openssl ocsp -resp_text -issuer " . escapeshellarg($issuer)
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. " -no_nonce"
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. " -CApath " . escapeshellarg($capath)
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. " -url " . escapeshellarg($ovpns['ocspurl'])
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. " -serial " . escapeshellarg($serial), $status_out);
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$status = implode(",", $status_out);
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syslog(LOG_WARNING, "Returned status {$status}");
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if (preg_match('/(error|fail)/', $status)) {
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syslog(LOG_WARNING, "Certificate - (error|fail)");
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echo "FAILED";
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closelog();
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return;
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} else if (preg_match('/Cert Status: good/', $status)) {
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syslog(LOG_WARNING, "Cert Status good!");
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if (preg_match('/OCSP Response Status: successful \(0x0\)/', $status)) {
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syslog(LOG_WARNING, "Response verify OK");
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break;
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}
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} else {
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syslog(LOG_WARNING, "Certificate - General fail");
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echo "FAILED";
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closelog();
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return;
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}
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}
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$iteration = ++$iteration;
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}
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// Debug
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//syslog(LOG_WARNING, "Found certificate {$argv[2]} with depth {$cert_depth}");
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syslog(LOG_WARNING, "Validation done!!");
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closelog();
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if (isset($_GET['certdepth'])) {
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echo "OK";
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} else {
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exit(0);
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}
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?>
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