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#!/usr/local/bin/php-cgi -f
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<?php
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/*
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openvpn.auth-user.php
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Copyright (C) 2008 Shrew Soft Inc
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Copyright (C) 2010 Ermal Luçi
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Copyright (C) 2013-2015 Electric Sheep Fencing, LP
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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1. Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
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INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
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AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
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OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* OpenVPN calls this script to authenticate a user
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* based on a username and password. We lookup these
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* in our config.xml file and check the credentials.
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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("radius.inc");
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require_once("auth.inc");
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require_once("interfaces.inc");
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/**
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* Get the NAS-Identifier
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*
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* We will use our local hostname to make up the nas_id
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*/
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if (!function_exists("getNasID")) {
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function getNasID() {
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global $g;
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$nasId = gethostname();
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if (empty($nasId)) {
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$nasId = $g['product_name'];
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}
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return $nasId;
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}
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}
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/**
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* Get the NAS-IP-Address based on the current wan address
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*
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* Use functions in interfaces.inc to find this out
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*
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*/
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if (!function_exists("getNasIP")) {
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function getNasIP() {
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$nasIp = get_interface_ip();
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if (!$nasIp) {
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$nasIp = "0.0.0.0";
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}
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return $nasIp;
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}
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}
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/* setup syslog logging */
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openlog("openvpn", LOG_ODELAY, LOG_AUTH);
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if (isset($_GET['username'])) {
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$authmodes = explode(",", $_GET['authcfg']);
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$username = base64_decode(str_replace('%3D', '=', $_GET['username']));
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$password = base64_decode(str_replace('%3D', '=', $_GET['password']));
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$common_name = $_GET['cn'];
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$modeid = $_GET['modeid'];
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$strictusercn = $_GET['strictcn'] == "false" ? false : true;
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} else {
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/* read data from environment */
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$username = getenv("username");
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$password = getenv("password");
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$common_name = getenv("common_name");
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}
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if (!$username || !$password) {
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syslog(LOG_ERR, "invalid user authentication environment");
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if (isset($_GET['username'])) {
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echo "FAILED";
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closelog();
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return;
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} else {
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closelog();
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return (-1);
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}
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}
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/* Replaced by a sed with proper variables used below(ldap parameters). */
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//<template>
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if (file_exists("{$g['varetc_path']}/openvpn/{$modeid}.ca")) {
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putenv("LDAPTLS_CACERT={$g['varetc_path']}/openvpn/{$modeid}.ca");
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putenv("LDAPTLS_REQCERT=never");
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}
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$authenticated = false;
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if (($strictusercn === true) && (mb_strtolower($common_name) !== mb_strtolower($username))) {
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syslog(LOG_WARNING, "Username does not match certificate common name ({$username} != {$common_name}), access denied.\n");
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if (isset($_GET['username'])) {
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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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return (1);
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}
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}
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if (!is_array($authmodes)) {
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syslog(LOG_WARNING, "No authentication server has been selected to authenticate against. Denying authentication for user {$username}");
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if (isset($_GET['username'])) {
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echo "FAILED";
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closelog();
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return;
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} else {
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closelog();
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return (1);
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}
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}
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$attributes = array();
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foreach ($authmodes as $authmode) {
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$authcfg = auth_get_authserver($authmode);
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if (!$authcfg && $authmode != "Local Database") {
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continue;
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}
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$authenticated = authenticate_user($username, $password, $authcfg, $attributes);
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if ($authenticated == true) {
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break;
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}
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}
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if ($authenticated == false) {
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syslog(LOG_WARNING, "user '{$username}' could not authenticate.\n");
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if (isset($_GET['username'])) {
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echo "FAILED";
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closelog();
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return;
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} else {
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closelog();
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return (-1);
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}
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}
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if (file_exists("/etc/inc/openvpn.attributes.php")) {
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include_once("/etc/inc/openvpn.attributes.php");
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}
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$content = "";
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if (is_array($attributes['dns-servers'])) {
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foreach ($attributes['dns-servers'] as $dnssrv) {
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if (is_ipaddr($dnssrv)) {
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$content .= "push \"dhcp-option DNS {$dnssrv}\"\n";
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}
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}
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}
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if (is_array($attributes['routes'])) {
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foreach ($attributes['routes'] as $route) {
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$content .= "push \"route {$route} vpn_gateway\"\n";
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}
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}
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if (isset($attributes['framed_ip'])) {
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if (isset($attributes['framed_mask'])) {
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$content .= "topology subnet\n";
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$content .= "ifconfig-push {$attributes['framed_ip']} {$attributes['framed_mask']}";
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} else {
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$content .= "topology net30\n";
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$content .= "ifconfig-push {$attributes['framed_ip']} ". long2ip((ip2long($attributes['framed_ip']) - 1));
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}
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}
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if (!empty($content)) {
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@file_put_contents("{$g['tmp_path']}/{$username}", $content);
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}
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syslog(LOG_NOTICE, "user '{$username}' authenticated\n");
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closelog();
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if (isset($_GET['username'])) {
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echo "OK";
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} else {
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return (0);
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}
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?>
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