#!/usr/local/bin/php-cgi -f
<?php
/*
 * openvpn.auth-user.php
 *
 * part of pfSense (https://www.pfsense.org)
 * Copyright (c) 2008 Shrew Soft Inc
 * Copyright (c) 2008-2016 Electric Sheep Fencing, LLC
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgment:
 *    "This product includes software developed by the pfSense Project
 *    for use in the pfSense® software distribution. (http://www.pfsense.org/).
 *
 * 4. The names "pfSense" and "pfSense Project" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission. For written permission, please contact
 *    coreteam@pfsense.org.
 *
 * 5. Products derived from this software may not be called "pfSense"
 *    nor may "pfSense" appear in their names without prior written
 *    permission of the Electric Sheep Fencing, LLC.
 *
 * 6. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *
 * "This product includes software developed by the pfSense Project
 * for use in the pfSense software distribution (http://www.pfsense.org/).
 *
 * THIS SOFTWARE IS PROVIDED BY THE pfSense PROJECT ``AS IS'' AND ANY
 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE pfSense PROJECT OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/*
 * OpenVPN calls this script to authenticate a user
 * based on a username and password. We lookup these
 * in our config.xml file and check the credentials.
 */

require_once("globals.inc");
require_once("config.inc");
require_once("radius.inc");
require_once("auth.inc");
require_once("interfaces.inc");

/**
 * Get the NAS-Identifier
 *
 * We will use our local hostname to make up the nas_id
 */
if (!function_exists("getNasID")) {
function getNasID() {
	global $g;

	$nasId = gethostname();
	if (empty($nasId)) {
		$nasId = $g['product_name'];
	}
	return $nasId;
}
}

/**
 * Get the NAS-IP-Address based on the current wan address
 *
 * Use functions in interfaces.inc to find this out
 *
 */
if (!function_exists("getNasIP")) {
function getNasIP() {
	$nasIp = get_interface_ip();
	if (!$nasIp) {
		$nasIp = "0.0.0.0";
	}
	return $nasIp;
}
}
/* setup syslog logging */
openlog("openvpn", LOG_ODELAY, LOG_AUTH);

if (isset($_GET['username'])) {
	$authmodes = explode(",", $_GET['authcfg']);
	/* Any string retrieved through $_GET is automatically urlDecoded */
	$username = base64_decode($_GET['username']);
	$password = base64_decode($_GET['password']);
	$common_name = $_GET['cn'];
	$modeid = $_GET['modeid'];
	$strictusercn = $_GET['strictcn'] == "false" ? false : true;
} else {
	/* read data from environment */
	$username = getenv("username");
	$password = getenv("password");
	$common_name = getenv("common_name");
}

if (!$username || !$password) {
	syslog(LOG_ERR, "invalid user authentication environment");
	if (isset($_GET['username'])) {
		echo "FAILED";
		closelog();
		return;
	} else {
		closelog();
		return (-1);
	}
}

/* Replaced by a sed with proper variables used below(ldap parameters). */
//<template>

if (file_exists("{$g['varetc_path']}/openvpn/{$modeid}.ca")) {
	putenv("LDAPTLS_CACERT={$g['varetc_path']}/openvpn/{$modeid}.ca");
	putenv("LDAPTLS_REQCERT=never");
}

$authenticated = false;

if (($strictusercn === true) && (mb_strtolower($common_name) !== mb_strtolower($username))) {
	syslog(LOG_WARNING, "Username does not match certificate common name ({$username} != {$common_name}), access denied.\n");
	if (isset($_GET['username'])) {
		echo "FAILED";
		closelog();
		return;
	} else {
		closelog();
		return (1);
	}
}

if (!is_array($authmodes)) {
	syslog(LOG_WARNING, "No authentication server has been selected to authenticate against. Denying authentication for user {$username}");
	if (isset($_GET['username'])) {
		echo "FAILED";
		closelog();
		return;
	} else {
		closelog();
		return (1);
	}
}

$attributes = array();
foreach ($authmodes as $authmode) {
	$authcfg = auth_get_authserver($authmode);
	if (!$authcfg && $authmode != "Local Database") {
		continue;
	}

	$authenticated = authenticate_user($username, $password, $authcfg, $attributes);
	if ($authenticated == true) {
		break;
	}
}

if ($authenticated == false) {
	syslog(LOG_WARNING, "user '{$username}' could not authenticate.\n");
	if (isset($_GET['username'])) {
		echo "FAILED";
		closelog();
		return;
	} else {
		closelog();
		return (-1);
	}
}

if (file_exists("/etc/inc/openvpn.attributes.php")) {
	include_once("/etc/inc/openvpn.attributes.php");
}

$content = "";
if (is_array($attributes['dns-servers'])) {
	foreach ($attributes['dns-servers'] as $dnssrv) {
		if (is_ipaddr($dnssrv)) {
			$content .= "push \"dhcp-option DNS {$dnssrv}\"\n";
		}
	}
}
if (is_array($attributes['routes'])) {
	foreach ($attributes['routes'] as $route) {
		$content .= "push \"route {$route} vpn_gateway\"\n";
	}
}

if (isset($attributes['framed_ip'])) {
	if (isset($attributes['framed_mask'])) {
		$content .= "topology subnet\n";
		$content .= "ifconfig-push {$attributes['framed_ip']} {$attributes['framed_mask']}";
	} else {
		$content .= "topology net30\n";
		$content .= "ifconfig-push {$attributes['framed_ip']} ". long2ip((ip2long($attributes['framed_ip']) - 1));
	}
}

if (!empty($content)) {
	@file_put_contents("{$g['tmp_path']}/{$username}", $content);
}

syslog(LOG_NOTICE, "user '{$username}' authenticated\n");
closelog();

if (isset($_GET['username'])) {
	echo "OK";
} else {
	return (0);
}

?>
