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#!/usr/local/bin/php
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<?php
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/*
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index.php
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part of m0n0wall (http://m0n0.ch/wall)
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Copyright (C) 2003-2004 Manuel Kasper <mk@neon1.net>.
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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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require("globals.inc");
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require("util.inc");
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require("config.inc");
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require("radius_authentication.inc") ;
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require("radius_accounting.inc") ;
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header("Expires: 0");
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header("Cache-Control: no-store, no-cache, must-revalidate");
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header("Cache-Control: post-check=0, pre-check=0", false);
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header("Pragma: no-cache");
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$orig_host = $_ENV['HTTP_HOST'];
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$orig_request = $_ENV['CAPTIVE_REQPATH'];
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$lockfile = "{$g['varrun_path']}/captiveportal.lock";
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$clientip = $_ENV['REMOTE_ADDR'];
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if (!$clientip) {
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/* not good - bail out */
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exit;
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}
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/* find MAC address for client */
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$clientmac = arp_get_mac_by_ip($clientip);
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if (!$clientmac && !isset($config['captiveportal']['nomacfilter'])) {
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/* unable to find MAC address - shouldn't happen! - bail out */
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exit;
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}
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if ($clientmac && portal_mac_fixed($clientmac)) {
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/* punch hole in ipfw for pass thru mac addresses */
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portal_allow($clientip, $clientmac, "unauthenticated");
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} else if ($_POST['accept'] && file_exists("{$g['vardb_path']}/captiveportal_radius.db")) {
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/* authenticate against radius server */
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$radiusservers = captiveportal_get_radius_servers();
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if ($_POST['auth_user'] && $_POST['auth_pass']) {
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$auth_val = RADIUS_AUTHENTICATION($_POST['auth_user'],
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$_POST['auth_pass'],
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$radiusservers[0]['ipaddr'],
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$radiusservers[0]['port'],
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$radiusservers[0]['key']);
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if ($auth_val == 2) {
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$sessionid = portal_allow($clientip, $clientmac, $_POST['auth_user']);
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if (isset($config['captiveportal']['radacct_enable']) && isset($radiusservers[0])) {
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$auth_val = RADIUS_ACCOUNTING_START($_POST['auth_user'],
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$sessionid,
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$radiusservers[0]['ipaddr'],
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$radiusservers[0]['acctport'],
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$radiusservers[0]['key']);
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}
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} else {
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readfile("{$g['varetc_path']}/captiveportal-error.html");
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}
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} else {
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readfile("{$g['varetc_path']}/captiveportal-error.html");
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}
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} else if ($_POST['accept'] && $clientip) {
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portal_allow($clientip, $clientmac, "unauthenticated");
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} else if ($_POST['logout_id']) {
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disconnect_client($_POST['logout_id']);
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echo <<<EOD
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<HTML>
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<HEAD><TITLE>Disconnecting...</TITLE></HEAD>
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<BODY BGCOLOR="#435370">
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<SPAN STYLE="color: #ffffff; font-family: Tahoma, Verdana, Arial, Helvetica, sans-serif; font-size: 11px;">
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<B>You've been disconnected.</B>
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</SPAN>
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<SCRIPT LANGUAGE="JavaScript">
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<!--
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setTimeout('window.close();',5000) ;
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-->
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</SCRIPT>
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</BODY>
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</HTML>
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EOD;
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} else if (($_ENV['SERVER_PORT'] != 8001) && isset($config['captiveportal']['httpslogin'])) {
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/* redirect to HTTPS login page */
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header("Location: https://{$config['captiveportal']['httpsname']}:8001/?redirurl=" . urlencode("http://{$orig_host}{$orig_request}"));
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} else {
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/* display captive portal page */
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$htmltext = file_get_contents("{$g['varetc_path']}/captiveportal.html");
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/* substitute variables */
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if (isset($config['captiveportal']['httpslogin']))
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$htmltext = str_replace("\$PORTAL_ACTION\$", "https://{$config['captiveportal']['httpsname']}:8001/", $htmltext);
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else
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$htmltext = str_replace("\$PORTAL_ACTION\$", "", $htmltext);
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if (preg_match("/redirurl=(.*)/", $orig_request, $matches))
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$redirurl = urldecode($matches[1]);
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else
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$redirurl = "http://{$orig_host}{$orig_request}";
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$htmltext = str_replace("\$PORTAL_REDIRURL\$", htmlspecialchars($redirurl), $htmltext);
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echo $htmltext;
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}
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exit;
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function portal_mac_fixed($clientmac) {
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global $g ;
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/* open captive portal mac db */
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if (file_exists("{$g['vardb_path']}/captiveportal_mac.db")) {
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$fd = @fopen("{$g['vardb_path']}/captiveportal_mac.db","r") ;
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if (!$fd) {
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return FALSE;
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}
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while (!feof($fd)) {
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$mac = trim(fgets($fd)) ;
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if(strcasecmp($clientmac, $mac) == 0) {
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fclose($fd) ;
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return TRUE ;
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}
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}
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fclose($fd) ;
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}
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return FALSE ;
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}
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function portal_allow($clientip,$clientmac,$clientuser) {
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global $orig_host, $orig_request, $g, $config;
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/* user has accepted AUP - let him in */
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portal_lock();
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/* get next ipfw rule number */
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if (file_exists("{$g['vardb_path']}/captiveportal.nextrule"))
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$ruleno = trim(file_get_contents("{$g['vardb_path']}/captiveportal.nextrule"));
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if (!$ruleno)
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$ruleno = 10000; /* first rule number */
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$saved_ruleno = $ruleno;
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/* generate unique session ID */
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$tod = gettimeofday();
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$sessionid = substr(md5(mt_rand() . $tod['sec'] . $tod['usec'] . $clientip . $clientmac), 0, 16);
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/* add ipfw rules for layer 3 */
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exec("/sbin/ipfw add $ruleno set 2 skipto 50000 ip from $clientip to any in");
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exec("/sbin/ipfw add $ruleno set 2 skipto 50000 ip from any to $clientip out");
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/* add ipfw rules for layer 2 */
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if (!isset($config['captiveportal']['nomacfilter'])) {
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$l2ruleno = $ruleno + 10000;
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exec("/sbin/ipfw add $l2ruleno set 3 deny all from $clientip to any not MAC any $clientmac layer2 in");
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exec("/sbin/ipfw add $l2ruleno set 3 deny all from any to $clientip not MAC $clientmac any layer2 out");
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}
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/* read in client database */
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$cpdb = array();
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$fd = @fopen("{$g['vardb_path']}/captiveportal.db", "r");
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if ($fd) {
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while (!feof($fd)) {
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$line = trim(fgets($fd)) ;
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if($line) {
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$cpdb[] = explode(",",$line);
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}
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}
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fclose($fd);
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}
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$radiusservers = captiveportal_get_radius_servers();
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/* find an existing entry and delete it */
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for ($i = 0; $i < count($cpdb); $i++) {
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if(!strcasecmp($cpdb[$i][2],$clientip)) {
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if(isset($config['captiveportal']['radacct_enable']) && isset($radiusservers[0])) {
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RADIUS_ACCOUNTING_STOP($cpdb[$i][1], // ruleno
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$cpdb[$i][4], // username
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$cpdb[$i][5], // sessionid
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$cpdb[$i][0], // start time
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$radiusservers[0]['ipaddr'],
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$radiusservers[0]['acctport'],
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$radiusservers[0]['key']);
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}
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mwexec("/sbin/ipfw delete " . $cpdb[$i][1] . " " . ($cpdb[$i][1]+10000));
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unset($cpdb[$i]);
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break;
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}
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}
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/* rewrite information to database */
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$fd = @fopen("{$g['vardb_path']}/captiveportal.db", "w");
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if ($fd) {
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foreach ($cpdb as $cpent) {
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fwrite($fd, join(",", $cpent) . "\n");
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}
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/* write in this new entry */
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fwrite($fd, time().",{$ruleno},{$clientip},{$clientmac},{$clientuser},{$sessionid}\n") ;
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fclose($fd);
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}
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/* write next rule number */
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$fd = @fopen("{$g['vardb_path']}/captiveportal.nextrule", "w");
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if ($fd) {
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$ruleno++;
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if ($ruleno > 19899)
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$ruleno = 10000; /* wrap around */
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fwrite($fd, $ruleno);
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fclose($fd);
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}
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portal_unlock();
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/* redirect user to desired destination */
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if ($config['captiveportal']['redirurl'])
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$redirurl = $config['captiveportal']['redirurl'];
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else if ($_POST['redirurl'])
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$redirurl = $_POST['redirurl'];
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else
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$redirurl = "http://{$orig_host}{$orig_request}";
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if(isset($config['captiveportal']['logoutwin_enable'])) {
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252
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253
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if (isset($config['captiveportal']['httpslogin']))
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$logouturl = "https://{$config['captiveportal']['httpsname']}:8001/";
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else
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$logouturl = "http://{$config['interfaces'][$config['captiveportal']['interface']]['ipaddr']}:8000/";
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echo <<<EOD
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<HTML>
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260
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<HEAD><TITLE>Redirecting...</TITLE></HEAD>
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<BODY>
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262
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<SPAN STYLE="font-family: Tahoma, Verdana, Arial, Helvetica, sans-serif; font-size: 11px;">
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<B>Redirecting to <A HREF="{$redirurl}">{$redirurl}</A>...</B>
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</SPAN>
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<SCRIPT LANGUAGE="JavaScript">
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266
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<!--
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267
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LogoutWin = window.open('', 'Logout', 'toolbar=0,scrollbars=0,location=0,statusbar=0,menubar=0,resizable=0,width=256,height=64');
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268
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if (LogoutWin) {
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269
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LogoutWin.document.write('<HTML>');
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270
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LogoutWin.document.write('<HEAD><TITLE>Logout</TITLE></HEAD>') ;
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LogoutWin.document.write('<BODY BGCOLOR="#435370">');
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LogoutWin.document.write('<DIV ALIGN="center" STYLE="color: #ffffff; font-family: Tahoma, Verdana, Arial, Helvetica, sans-serif; font-size: 11px;">') ;
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LogoutWin.document.write('<B>Click the button below to disconnect</B><P>');
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LogoutWin.document.write('<FORM METHOD="POST" ACTION="{$logouturl}">');
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LogoutWin.document.write('<INPUT NAME="logout_id" TYPE="hidden" VALUE="{$sessionid}">');
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276
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LogoutWin.document.write('<INPUT NAME="logout" TYPE="submit" VALUE="Logout">');
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277
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LogoutWin.document.write('</FORM>');
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278
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LogoutWin.document.write('</DIV></BODY>');
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279
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LogoutWin.document.write('</HTML>');
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280
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LogoutWin.document.close();
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281
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}
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282
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283
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document.location.href="{$redirurl}";
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284
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-->
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285
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</SCRIPT>
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286
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</BODY>
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287
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</HTML>
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288
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289
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EOD;
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290
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} else {
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291
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header("Location: " . $redirurl);
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292
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}
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293
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294
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return $sessionid;
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295
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}
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296
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297
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/* read RADIUS servers into array */
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298
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function captiveportal_get_radius_servers() {
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299
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300
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global $g;
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301
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|
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302
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if (file_exists("{$g['vardb_path']}/captiveportal_radius.db")) {
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303
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$fd = @fopen("{$g['vardb_path']}/captiveportal_radius.db","r");
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304
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if ($fd) {
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305
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$radiusservers = array();
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306
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while (!feof($fd)) {
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307
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$line = trim(fgets($fd));
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308
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if ($line) {
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309
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$radsrv = array();
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310
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list($radsrv['ipaddr'],$radsrv['port'],$radsrv['acctport'],$radsrv['key']) = explode(",",$line);
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311
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$radiusservers[] = $radsrv;
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312
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}
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313
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}
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314
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fclose($fd);
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315
|
|
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316
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return $radiusservers;
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317
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}
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318
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}
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319
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|
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320
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return false;
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321
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}
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|
322
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|
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323
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/* lock captive portal information, decide that the lock file is stale after
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324
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10 seconds */
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325
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function portal_lock() {
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326
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|
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327
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global $lockfile;
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328
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|
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329
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$n = 0;
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330
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while ($n < 10) {
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331
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/* open the lock file in append mode to avoid race condition */
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332
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if ($fd = @fopen($lockfile, "x")) {
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333
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/* succeeded */
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334
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fclose($fd);
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335
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return;
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336
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} else {
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337
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/* file locked, wait and try again */
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338
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sleep(1);
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339
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$n++;
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340
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}
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341
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}
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342
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}
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|
343
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|
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344
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/* unlock captive portal information file */
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345
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function portal_unlock() {
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|
346
|
|
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347
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global $lockfile;
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|
348
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|
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349
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if (file_exists($lockfile))
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350
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unlink($lockfile);
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351
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}
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|
352
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|
|
353
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/* remove a single client by session ID
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|
354
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by Dinesh Nair
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355
|
*/
|
|
356
|
function disconnect_client($sessionid) {
|
|
357
|
|
|
358
|
global $g, $config;
|
|
359
|
|
|
360
|
portal_lock();
|
|
361
|
|
|
362
|
/* read database */
|
|
363
|
$cpdb = array() ;
|
|
364
|
$fd = @fopen("{$g['vardb_path']}/captiveportal.db", "r");
|
|
365
|
if ($fd) {
|
|
366
|
while (!feof($fd)) {
|
|
367
|
$line = trim(fgets($fd)) ;
|
|
368
|
if($line) {
|
|
369
|
$cpdb[] = explode(",",$line);
|
|
370
|
}
|
|
371
|
}
|
|
372
|
fclose($fd);
|
|
373
|
}
|
|
374
|
|
|
375
|
$radiusservers = captiveportal_get_radius_servers();
|
|
376
|
|
|
377
|
/* find entry */
|
|
378
|
for ($i = 0; $i < count($cpdb); $i++) {
|
|
379
|
if ($cpdb[$i][5] == $sessionid) {
|
|
380
|
/* this client needs to be deleted - remove ipfw rules */
|
|
381
|
if(isset($config['captiveportal']['radacct_enable']) && isset($radiusservers[0])) {
|
|
382
|
RADIUS_ACCOUNTING_STOP($cpdb[$i][1], // ruleno
|
|
383
|
$cpdb[$i][4], // username
|
|
384
|
$cpdb[$i][5], // sessionid
|
|
385
|
$cpdb[$i][0], // start time
|
|
386
|
$radiusservers[0]['ipaddr'],
|
|
387
|
$radiusservers[0]['acctport'],
|
|
388
|
$radiusservers[0]['key']);
|
|
389
|
}
|
|
390
|
mwexec("/sbin/ipfw delete " . $cpdb[$i][1] . " " . ($cpdb[$i][1]+10000));
|
|
391
|
unset($cpdb[$i]);
|
|
392
|
break;
|
|
393
|
}
|
|
394
|
}
|
|
395
|
|
|
396
|
/* rewrite information to database */
|
|
397
|
$fd = @fopen("{$g['vardb_path']}/captiveportal.db", "w");
|
|
398
|
if ($fd) {
|
|
399
|
foreach ($cpdb as $cpent) {
|
|
400
|
fwrite($fd, join(",", $cpent) . "\n");
|
|
401
|
}
|
|
402
|
fclose($fd);
|
|
403
|
}
|
|
404
|
|
|
405
|
portal_unlock();
|
|
406
|
}
|
|
407
|
?>
|