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<?php
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/*
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* openvpn.auth-user.php
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*
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* part of pfSense (https://www.pfsense.org)
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* Copyright (c) 2008 Shrew Soft Inc
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* Copyright (c) 2008-2018 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 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 return "openVPN" so that connections can be distinguished by the Radius
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*/
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if (!function_exists("getNasID")) {
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function getNasID() {
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return "openVPN";
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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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/**
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* Set the NAS-Port-Type
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*
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* Should be "Virtual" since that denotes VPN connections
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*/
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if (!function_exists("getNasPortType")) {
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function getNasPortType() {
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return RADIUS_VIRTUAL;
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}
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}
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/**
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* Set the NAS-Port
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*
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* We will return the port the client connected to
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*/
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if (!function_exists("getNasPort")) {
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function getNasPort() {
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return $_GET['nas_port'];
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}
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}
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/**
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* Set the Called-Station-ID
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*
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* We will return the IP and port the client connected to
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*/
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if (!function_exists("getCalledStationId")) {
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function getCalledStationId() {
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return get_interface_ip() . ":" . getNasPort();
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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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global $common_name, $username;
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if (isset($_GET['username'])) {
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$authmodes = explode(",", base64_decode($_GET['authcfg']));
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/* Any string retrieved through $_GET is automatically urlDecoded */
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$username = base64_decode($_GET['username']);
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$password = base64_decode($_GET['password']);
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$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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