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<?php
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/* $Id$ */
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/*
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openvpn.inc
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Copyright (C) 2004 Peter Curran (peter@closeconsultants.com).
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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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/* include all configuration functions */
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require_once("globals.inc");
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require_once("config.inc");
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require_once("functions.inc");
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function ovpn_configure() {
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global $config;
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if (is_array($config['ovpn']['server']))
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ovpn_config_server();
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if (is_array($config['ovpn']['client']))
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ovpn_config_client();
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return;
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}
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function ovpn_link_tap() {
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/* Add a reference to the tap KLM. If ref count = 1, load it */
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global $g;
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if (!is_file($g['vardb_path'] ."/ovpn_tap_link")){
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$link_count = 1;
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mwexec("/sbin/kldload if_tap");
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$fd = fopen($g['vardb_path'] ."/ovpn_tap_link", 'w');
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}
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else {
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$fd = fopen($g['vardb_path'] ."/ovpn_tap_link", 'r+');
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$link_count = fread($fd);
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$link_count ++;
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}
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fwrite($fd, $link_count);
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fclose($fd);
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return true;
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}
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function ovpn_unlink_tap() {
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/* Remove a reference to the tap KLM. If ref count = 0, unload it */
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global $g;
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if (!is_file($g['vardb_path'] ."/ovpn_tap_link"))
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return false; //no file, no links so why are we called?
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$fd = fopen($g['vardb_path'] ."/ovpn_tap_link", 'r+');
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$link_count = fread($fd);
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$link_count --;
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fwrite($fd, $link_count);
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fclose($fd);
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if ($link_count == 0)
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mwexec("/sbin/kldunload if_tap");
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return true;
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}
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/*****************************/
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/* Server-related functions */
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/* Configure the server */
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function ovpn_config_server() {
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global $config, $g;
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if (isset($config['ovpn']['server']['enable'])) {
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if ($g['booting'])
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echo "Configuring OpenVPN... ";
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/* kill any running openvpn daemon */
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killbypid($g['varrun_path']."/ovpn_srv.pid");
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/* Remove old certs & keys */
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unlink_if_exists("{$g['vardb_path']}/ovpn_ca_cert.pem");
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unlink_if_exists("{$g['vardb_path']}/ovpn_srv_cert.pem");
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unlink_if_exists("{$g['vardb_path']}/ovpn_srv_key.pem");
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unlink_if_exists("{$g['vardb_path']}/ovpn_dh.pem");
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/* Copy the TLS-Server certs & keys to disk */
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$fd = @fopen("{$g['vardb_path']}/ovpn_ca_cert.pem", "w");
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if ($fd) {
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fwrite($fd, base64_decode($config['ovpn']['server']['ca_cert'])."\n");
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fclose($fd);
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}
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$fd = @fopen("{$g['vardb_path']}/ovpn_srv_cert.pem", "w");
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if ($fd) {
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fwrite($fd, base64_decode($config['ovpn']['server']['srv_cert'])."\n");
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fclose($fd);
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}
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$fd = @fopen("{$g['vardb_path']}/ovpn_srv_key.pem", "w");
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if ($fd) {
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fwrite($fd, base64_decode($config['ovpn']['server']['srv_key'])."\n");
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fclose($fd);
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}
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$fd = @fopen("{$g['vardb_path']}/ovpn_dh.pem", "w");
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if ($fd) {
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fwrite($fd, base64_decode($config['ovpn']['server']['dh_param'])."\n");
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fclose($fd);
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}
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/* Start the openvpn daemon */
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mwexec("/usr/local/sbin/openvpn " . ovpn_srv_config_generate());
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if ($g['booting'])
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/* Send the boot message */
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echo "done.\n";
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}
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else {
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if (!$g['booting']){
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/* stop any processes, unload the tap module */
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/* Remove old certs & keys */
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unlink_if_exists("{$g['vardb_path']}/ovpn_ca_cert.pem");
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unlink_if_exists("{$g['vardb_path']}/ovpn_srv_cert.pem");
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unlink_if_exists("{$g['vardb_path']}/ovpn_srv_key.pem");
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unlink_if_exists("{$g['vardb_path']}/ovpn_dh.pem");
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killbypid("{$g['varrun_path']}/ovpn_srv.pid");
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if ($config['ovpn']['server']['tun_iface'] == 'tap0')
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ovpn_unlink_tap();
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}
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}
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return 0;
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}
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/* Generate the config for a OpenVPN server */
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function ovpn_srv_config_generate() {
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global $config, $g;
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$server = $config['ovpn']['server'];
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/* First the generic stuff:
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- We are a server
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- We are a TLS Server (for authentication)
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- We will run without privilege
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*/
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$ovpn_config = "--daemon --user nobody --group nobody --verb {$server['verb']} ";
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/* pid file */
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$ovpn_config .= "--writepid {$g['varrun_path']}/ovpn_srv.pid ";
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/* interface */
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$ovpn_config .= "--dev {$server['tun_iface']} ";
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/* port */
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$ovpn_config .= "--port {$server['port']} ";
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/* Interface binding - 1 or all */
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if ($server['bind_iface'] != 'all') {
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if ($ipaddr = ovpn_get_ip($server['bind_iface']))
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$ovpn_config .= "--local $ipaddr ";
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else
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return "Interface bridged";
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}
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/* Client to client routing (off by default) */
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if (isset($server['cli2cli']))
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$ovpn_config .= "--client-to-client ";
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/* Set maximum simultaneous clients */
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$ovpn_config .= "--max-clients {$server['maxcli']} ";
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/* New --server macro simplifies config */
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$mask = ovpn_calc_mask($server['prefix']);
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$ovpn_config .= "--server {$server['ipblock']} {$mask} ";
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/* TLS-Server params */
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$ovpn_config .= "--ca {$g['vardb_path']}/ovpn_ca_cert.pem ";
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$ovpn_config .= "--cert {$g['vardb_path']}/ovpn_srv_cert.pem ";
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$ovpn_config .= "--key {$g['vardb_path']}/ovpn_srv_key.pem ";
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$ovpn_config .= "--dh {$g['vardb_path']}/ovpn_dh.pem ";
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/* Data channel encryption cipher*/
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$ovpn_config .= "--cipher {$server['crypto']} ";
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/* Duplicate CNs */
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if (isset($server['dupcn']))
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$ovpn_config .= "--duplicate-cn ";
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/* Client push - redirect gateway */
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if (isset($server['psh_options']['redir'])){
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if (isset($server['psh_options']['redir_loc']))
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$ovpn_config .= "--push \"redirect-gateway 'local'\" ";
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else
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$ovpn_config .= "--push \"redirect-gateway\" ";
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}
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/* Client push - route delay */
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if (isset($server['psh_options']['rte_delay']))
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$ovpn_config .= "--push \"route-delay {$server['psh_options']['rte_delay']}\" ";
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/* Client push - ping (note we set both server and client) */
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if (isset ($server['psh_options']['ping'])){
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$ovpn_config .= "--ping {$server['psh_options']['ping']} ";
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$ovpn_config .= "--push \"ping {$server['psh_options']['ping']}\" ";
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}
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/* Client push - ping-restart (note server uses 2 x client interval) */
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if (isset ($server['psh_options']['pingrst'])){
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$interval = $server['psh_options']['pingrst'];
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$ovpn_config .= "--ping-restart " . ($interval * 2) . " ";
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$ovpn_config .= "--push \"ping-restart $interval\" ";
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}
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/* Client push - ping-exit (set on client) */
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if (isset ($server['psh_options']['pingexit'])){
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$ovpn_config .= "--ping-exit {$server['psh_options']['pingexit']} ";
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$ovpn_config .= "--push \"ping-exit {$server['psh_options']['pingexit']}\" ";
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}
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/* Client push - inactive (set on client) */
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if (isset ($server['psh_options']['inact'])){
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$ovpn_config .= "--inactive {$server['psh_options']['pingexit']} ";
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$ovpn_config .= "--push \"inactive {$server['psh_options']['inact']}\" ";
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}
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//trigger_error("OVPN: $ovpn_config", E_USER_NOTICE);
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return $ovpn_config;
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}
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/* Define an OVPN Server tunnel interface in the interfaces array and assign a name */
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function ovpn_server_iface(){
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global $config, $g;
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$i = 1;
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while (true) {
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$ifname = 'opt' . $i;
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if (is_array($config['interfaces'][$ifname])) {
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if ((isset($config['interfaces'][$ifname]['ovpn']))
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&& ($config['interfaces'][$ifname]['ovpn'] == 'server'))
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/* Already an interface defined - overwrite */
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break;
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}
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else {
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/* No existing entry, this is first unused */
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$config['interfaces'][$ifname] = array();
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break;
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}
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$i++;
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}
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$config['interfaces'][$ifname]['descr'] = "OVPN server";
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$config['interfaces'][$ifname]['if'] = $config['ovpn']['server']['tun_iface'];
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$config['interfaces'][$ifname]['ipaddr'] = long2ip( ip2long($config['ovpn']['server']['ipblock']) + 1);
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$config['interfaces'][$ifname]['subnet'] = $config['ovpn']['server']['prefix'];
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$config['interfaces'][$ifname]['enable'] = isset($config['ovpn']['server']['enable']) ? true : false;
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$config['interfaces'][$ifname]['ovpn'] = 'server';
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write_config();
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271
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return "OpenVPN server interface defined";
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}
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/********************************************************/
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/* Client related functions */
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function ovpn_config_client() {
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/* Boot time configuration */
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global $config, $g;
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foreach ($config['ovpn']['client']['tunnel'] as $id => $client) {
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if (isset($client['enable'])) {
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283
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284
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if ($g['booting'])
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echo "Starting OpenVPN client $id... ";
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286
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287
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/* kill any running openvpn daemon */
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killbypid("{$g['varrun_path']}/ovpn_client{$id}.pid");
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289
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290
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/* Remove old certs & keys */
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291
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unlink_if_exists("{$g['vardb_path']}/ovpn_ca_cert_{$id}.pem");
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unlink_if_exists("{$g['vardb_path']}/ovpn_cli_cert_{$id}.pem");
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unlink_if_exists("{$g['vardb_path']}/ovpn_cli_key_{$id}.pem");
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294
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295
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/* Copy the TLS-Client certs & keys to disk */
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/*$fd = @fopen("{$g['vardb_path']}/ovpn_ca_cert_{$id}.pem", "w");*/
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297
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$fd = fopen("{$g['vardb_path']}/ovpn_ca_cert_{$id}.pem", "w");
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if ($fd) {
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299
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fwrite($fd, base64_decode($client['ca_cert'])."\n");
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300
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fclose($fd);
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301
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}
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else
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303
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trigger_error("OVPN: No open for CA", E_USER_NOTICE);
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$fd = fopen($g['vardb_path']."/ovpn_cli_cert_".$id.".pem", "w");
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if ($fd) {
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306
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fwrite($fd, base64_decode($client['cli_cert'])."\n");
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fclose($fd);
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}
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$fd = fopen($g['vardb_path']."/ovpn_cli_key_".$id.".pem", "w");
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if ($fd) {
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311
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fwrite($fd, base64_decode($client['cli_key'])."\n");
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312
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fclose($fd);
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313
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}
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314
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315
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/* Start openvpn for this client */
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316
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mwexec("/usr/local/sbin/openvpn " . ovpn_cli_config_generate($id));
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317
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318
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if ($g['booting'])
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319
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/* Send the boot message */
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320
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echo "done.\n";
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321
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}
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322
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else {
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323
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if (!$g['booting']){
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324
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/* stop any processes, unload the tap module */
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325
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/* Remove old certs & keys */
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326
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unlink_if_exists("{$g['vardb_path']}/ovpn_ca_cert_{$id}.pem");
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327
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unlink_if_exists("{$g['vardb_path']}/ovpn_cli_cert_{$id}.pem");
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328
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unlink_if_exists("{$g['vardb_path']}/ovpn_cli_key_{$id}.pem");
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329
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killbypid("{$g['varrun_path']}/ovpn_client{$id}.pid");
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330
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if ($client['type'] == "tap")
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331
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ovpn_unlink_tap();
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332
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}
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333
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}
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334
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}
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335
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return 0;
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336
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337
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}
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338
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339
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/* Kill off a running client process */
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340
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function ovpn_client_kill($id) {
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341
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global $g;
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342
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343
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killbypid("{$g['varrun_path']}/ovpn_client{$id}.pid");
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344
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return 0;
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345
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}
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346
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347
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function ovpn_cli_config_generate($id) {
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348
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/* configure the named client */
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349
|
global $config, $g;
|
|
350
|
$client = $config['ovpn']['client']['tunnel'];
|
|
351
|
|
|
352
|
/* Client support in 2.0 is very simple */
|
|
353
|
|
|
354
|
$ovpn_config = "--client --daemon --verb 1 ";
|
|
355
|
|
|
356
|
/* pid file */
|
|
357
|
$ovpn_config .= "--writepid {$g['varrun_path']}/ovpn_client{$id}.pid ";
|
|
358
|
|
|
359
|
/* interface */
|
|
360
|
$ovpn_config .= "--dev {$client[$id]['if']} ";
|
|
361
|
|
|
362
|
/* protocol */
|
|
363
|
$ovpn_config .= "--proto {$client[$id]['proto']} ";
|
|
364
|
|
|
365
|
/* port */
|
|
366
|
$ovpn_config .= "--lport {$client[$id]['cport']} ";
|
|
367
|
|
|
368
|
/* server location */
|
|
369
|
$ovpn_config .= "--remote {$client[$id]['saddr']} {$client[$id]['sport']} ";
|
|
370
|
|
|
371
|
/* TLS-Server params */
|
|
372
|
$ovpn_config .= "--ca {$g['vardb_path']}/ovpn_ca_cert_{$id}.pem ";
|
|
373
|
$ovpn_config .= "--cert {$g['vardb_path']}/ovpn_cli_cert_{$id}.pem ";
|
|
374
|
$ovpn_config .= "--key {$g['vardb_path']}/ovpn_cli_key_{$id}.pem ";
|
|
375
|
|
|
376
|
/* Data channel encryption cipher*/
|
|
377
|
$ovpn_config .= "--cipher {$client[$id]['crypto']} ";
|
|
378
|
|
|
379
|
//trigger_error("OVPN: $ovpn_config", E_USER_NOTICE);
|
|
380
|
return $ovpn_config;
|
|
381
|
}
|
|
382
|
|
|
383
|
/* Define an OVPN tunnel interface in the interfaces array for each client */
|
|
384
|
function ovpn_client_iface(){
|
|
385
|
global $config;
|
|
386
|
|
|
387
|
foreach ($config['ovpn']['client']['tunnel'] as $id => $client) {
|
|
388
|
if (isset($client['enable'])) {
|
|
389
|
$i = 1;
|
|
390
|
while (true) {
|
|
391
|
$ifname = 'opt' . $i;
|
|
392
|
if (is_array($config['interfaces'][$ifname])) {
|
|
393
|
if ((isset($config['interfaces'][$ifname]['ovpn']))
|
|
394
|
&& ($config['interfaces'][$ifname]['ovpn'] == "client{$id}"))
|
|
395
|
/* Already an interface defined - overwrite */
|
|
396
|
break;
|
|
397
|
}
|
|
398
|
else {
|
|
399
|
/* No existing entry, this is first unused */
|
|
400
|
$config['interfaces'][$ifname] = array();
|
|
401
|
break;
|
|
402
|
}
|
|
403
|
$i++;
|
|
404
|
}
|
|
405
|
if (isset($client['descr']))
|
|
406
|
$config['interfaces'][$ifname]['descr'] = $client['descr'];
|
|
407
|
else
|
|
408
|
$config['interfaces'][$ifname]['descr'] = "OVPN client-{$id}";
|
|
409
|
$config['interfaces'][$ifname]['if'] = $client['if'];
|
|
410
|
$config['interfaces'][$ifname]['ipaddr'] = "0.0.0.0";
|
|
411
|
$config['interfaces'][$ifname]['subnet'] = "0";
|
|
412
|
$config['interfaces'][$ifname]['enable'] = isset($client['enable']) ? true : false;
|
|
413
|
$config['interfaces'][$ifname]['ovpn'] = "client{$id}";
|
|
414
|
write_config();
|
|
415
|
}
|
|
416
|
}
|
|
417
|
return "OpenVPN client interfaces defined";
|
|
418
|
}
|
|
419
|
|
|
420
|
/* Delete a client interface definition */
|
|
421
|
function ovpn_client_iface_del($id) {
|
|
422
|
global $config;
|
|
423
|
|
|
424
|
$i = 1;
|
|
425
|
while (true) {
|
|
426
|
$ifname = 'opt' . $i;
|
|
427
|
if (is_array($config['interfaces'][$ifname])) {
|
|
428
|
if ((isset($config['interfaces'][$ifname]['ovpn']))
|
|
429
|
&& ($config['interfaces'][$ifname]['ovpn'] == "client{$id}"))
|
|
430
|
unset($config['interfaces'][$ifname]);
|
|
431
|
}
|
|
432
|
}
|
|
433
|
}
|
|
434
|
|
|
435
|
/******************/
|
|
436
|
/* Misc functions */
|
|
437
|
|
|
438
|
/* Calculate the last address in a range given the start and /prefix */
|
|
439
|
function ovpn_calc_end($start, $prefix){
|
|
440
|
|
|
441
|
$first = ip2long($start);
|
|
442
|
$last = pow(2,(32 - $prefix)) - 1 + $first;
|
|
443
|
return long2ip($last);
|
|
444
|
}
|
|
445
|
|
|
446
|
/* Calculate a mask given a /prefix */
|
|
447
|
function ovpn_calc_mask($prefix){
|
|
448
|
|
|
449
|
return long2ip(ip2long("255.255.255.255") - (pow( 2, (32 - $prefix)) - 1));
|
|
450
|
}
|
|
451
|
|
|
452
|
/* Read in a file from the $_FILES array */
|
|
453
|
function ovpn_get_file($file){
|
|
454
|
global $g;
|
|
455
|
|
|
456
|
if (!is_uploaded_file($_FILES[$file]['tmp_name'])){
|
|
457
|
trigger_error("Bad file upload".$_FILES[$file]['error'], E_USER_NOTICE);
|
|
458
|
return NULL;
|
|
459
|
}
|
|
460
|
$contents = file_get_contents($_FILES[$file]['tmp_name']);
|
|
461
|
return $contents;
|
|
462
|
}
|
|
463
|
|
|
464
|
|
|
465
|
/* Get the IP address of a specified interface */
|
|
466
|
function ovpn_get_ip($iface){
|
|
467
|
global $config;
|
|
468
|
|
|
469
|
if ($iface == 'wan')
|
|
470
|
return get_current_wan_address();
|
|
471
|
|
|
472
|
if ($config['interfaces'][$iface]['bridge'])
|
|
473
|
/* No bridging (yet) */
|
|
474
|
return false;
|
|
475
|
return $config['interfaces'][$iface]['ipaddr'];
|
|
476
|
}
|
|
477
|
|
|
478
|
/* Get a list of the cipher options supported by OpenVPN */
|
|
479
|
function ovpn_get_cipher_list(){
|
|
480
|
|
|
481
|
/* exec("/usr/local/sbin/openvpn --show-ciphers", $raw);
|
|
482
|
print_r ($raw);
|
|
483
|
|
|
484
|
$ciphers = preg_grep('/ bit default key /', $raw);
|
|
485
|
|
|
486
|
for($i = 0; $i <count($ciphers); $i++){
|
|
487
|
$tmp = explode(' ',$ciphers[$i]);
|
|
488
|
$cipher_list["$tmp[0]"] = "{$tmp[0]} ({$tmp[1]} {$tmp[2]})";
|
|
489
|
}
|
|
490
|
*/
|
|
491
|
$cipher_list = array('DES-CBC' => 'DES-CBC (64 bit)',
|
|
492
|
'RC2-CBC' => 'RC2-CBC (128 bit)',
|
|
493
|
'DES-EDE-CBC' => 'DES-EDE-CBC (128 bit)',
|
|
494
|
'DES-EDE3-CBC' => 'DES-EDE3-CBC (192 bit)',
|
|
495
|
'DESX-CBC' => 'DESX-CBC (192 bit)',
|
|
496
|
'BF-CBC' => 'BF-CBC (128 bit)',
|
|
497
|
'RC2-40-CBC' => 'RC2-40-CBC (40 bit)',
|
|
498
|
'CAST5-CBC' => 'CAST5-CBC (128 bit)',
|
|
499
|
'RC5-CBC' => 'RC5-CBC (128 bit)',
|
|
500
|
'RC2-64-CBC' => 'RC2-64-CBC (64 bit)',
|
|
501
|
'AES-128-CBC' => 'AES-128-CBC (128 bit)',
|
|
502
|
'AES-192-CBC' => 'AES-192-CBC (192 bit)',
|
|
503
|
'AES-256-CBC' => 'AES-256-CBC (256 bit)');
|
|
504
|
return $cipher_list;
|
|
505
|
}
|
|
506
|
|
|
507
|
|
|
508
|
/* Build a list of the current real interfaces */
|
|
509
|
function ovpn_real_interface_list(){
|
|
510
|
global $config;
|
|
511
|
|
|
512
|
$interfaces = array('all' => 'ALL',
|
|
513
|
'lan' => 'LAN',
|
|
514
|
'wan' => 'WAN');
|
|
515
|
for ($i = 1; isset($config['interfaces']['opt' . $i]); $i++) {
|
|
516
|
if (isset($config['interfaces']['opt' . $i]['ovpn']))
|
|
517
|
/* Hide our own interface */
|
|
518
|
break;
|
|
519
|
if (isset($config['interfaces']['opt' . $i]['enable']))
|
|
520
|
$interfaces['opt' . $i] = $config['interfaces']['opt' . $i]['descr'];
|
|
521
|
}
|
|
522
|
return $interfaces;
|
|
523
|
}
|
|
524
|
|
|
525
|
|
|
526
|
/* lock openvpn information, decide that the lock file is stale after
|
|
527
|
10 seconds */
|
|
528
|
function ovpn_lock() {
|
|
529
|
|
|
530
|
global $g;
|
|
531
|
|
|
532
|
$lockfile = "{$g['varrun_path']}/ovpn.lock";
|
|
533
|
|
|
534
|
$n = 0;
|
|
535
|
while ($n < 10) {
|
|
536
|
/* open the lock file in append mode to avoid race condition */
|
|
537
|
if ($fd = @fopen($lockfile, "x")) {
|
|
538
|
/* succeeded */
|
|
539
|
fclose($fd);
|
|
540
|
return;
|
|
541
|
} else {
|
|
542
|
/* file locked, wait and try again */
|
|
543
|
sleep(1);
|
|
544
|
$n++;
|
|
545
|
}
|
|
546
|
}
|
|
547
|
}
|
|
548
|
|
|
549
|
/* unlock configuration file */
|
|
550
|
function ovpn_unlock() {
|
|
551
|
|
|
552
|
global $g;
|
|
553
|
|
|
554
|
$lockfile = "{$g['varrun_path']}/ovpn.lock";
|
|
555
|
|
|
556
|
if (file_exists($lockfile))
|
|
557
|
unlink($lockfile);
|
|
558
|
}
|
|
559
|
|
|
560
|
?>
|