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 From:  "Arian Maleki" <ahmaleki at gmail dot com>
 To:  m0n0wall dash dev at lists dot m0n0 dot ch
 Subject:  Re: [m0n0wall-dev] Captive Portal Logout Link
 Date:  Fri, 16 Jun 2006 08:50:36 -0700
For some reason the list isn't accepting my attachment.  Here is the
text of index.php.
Thanks,
Arian

-------------------index.php-----------------------------
#!/usr/local/bin/php
<?php
/*
    $Id$
    part of m0n0wall (http://m0n0.ch/wall)

    Copyright (C) 2003-2006 Manuel Kasper <mk at neon1 dot net>.
    All rights reserved.

    Redistribution and use in source and binary forms, with or without
    modification, are permitted provided that the following conditions are met:

    1. Redistributions of source code must retain the above copyright notice,
       this list of conditions and the following disclaimer.

    2. Redistributions in binary form must reproduce the above copyright
       notice, this list of conditions and the following disclaimer in the
       documentation and/or other materials provided with the distribution.

    THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
    INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
    AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
    AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
    OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
    POSSIBILITY OF SUCH DAMAGE.
*/

require_once("functions.inc");


header("Expires: 0");
header("Cache-Control: no-store, no-cache, must-revalidate");
header("Cache-Control: post-check=0, pre-check=0", false);
header("Pragma: no-cache");


$orig_host = $_ENV['HTTP_HOST'];
$orig_request = $_ENV['CAPTIVE_REQPATH'];
$clientip = $_ENV['REMOTE_ADDR'];

if (!$clientip) {
    /* not good - bail out */
    exit;
}


if (isset($config['captiveportal']['httpslogin']))
    $ourhostname = $config['captiveportal']['httpsname'] . ":8001";
else
    $ourhostname =
$config['interfaces'][$config['captiveportal']['interface']]['ipaddr']
. ":8000";

if ($orig_host != $ourhostname) {
    /* the client thinks it's connected to the desired web server, but instead
       it's connected to us. Issue a redirect... */

    if (isset($config['captiveportal']['httpslogin']))
        header("Location: https://{$ourhostname}/?redirurl=" .
urlencode("http://{$orig_host}{$orig_request}"));
    else
        header("Location: http://{$ourhostname}/?redirurl=" .
urlencode("http://{$orig_host}{$orig_request}"));

    exit;
}

if (preg_match("/redirurl=(.*)/", $orig_request, $matches))
    $redirurl = urldecode($matches[1]);
if ($_POST['redirurl'])
    $redirurl = $_POST['redirurl'];

$macfilter = !isset($config['captiveportal']['nomacfilter']);

/* find MAC address for client */
$clientmac = arp_get_mac_by_ip($clientip);
if (!$clientmac && $macfilter) {
    /* unable to find MAC address - shouldn't happen! - bail out */
    captiveportal_logportalauth("unauthenticated","noclientmac",$clientip,"ERROR");
    exit;
}

/* find out if we need RADIUS + RADIUSMAC or not */
if (file_exists("{$g['vardb_path']}/captiveportal_radius.db")) {
    $radius_enable = TRUE;
    if ($radius_enable && isset($config['captiveportal']['radmac_enable']))
        $radmac_enable = TRUE;
}


if ($_POST['logout_id']) {
	$sid = disconnect_client_bymac($clientmac);
    //disconnect_client($_POST['logout_id']);
    echo $sid[1];
    disconnect_client($sid[0]);
    $usedtime = round(((time() - $sid[1])/60));
    echo <<<EOD
<HTML>
<HEAD><TITLE>Disconnecting...</TITLE></HEAD>
<BODY BGCOLOR="#435370">
<SPAN STYLE="color: #ffffff; font-family: Tahoma, Verdana, Arial,
Helvetica, sans-serif; font-size: 11px;">
<br>
<b>MAC:{$clientmac} <br>
   IP:{$clientip} <br>
   SessionId: {$sid[0]} <br>
   Time Used: {$usedtime} minutes</b>
<br>
<B>You've been disconnected.</B>
<br>
<B>You've been disconnected.</B>
</SPAN>
</BODY>
</HTML>

EOD;
}
/*Logout Link Code*/
else if ($orig_request == '/logout.php'){
	$sid = array();
	$sid = disconnect_client_bymac($clientmac);
	disconnect_client($sid[0]);
	$usedtime = round(((time() - $sid[1])/60));
	echo <<<EOD
<HTML>
<HEAD><TITLE>Disconnecting...</TITLE></HEAD>
<BODY BGCOLOR="#435370">
<SPAN STYLE="color: #ffffff; font-family: Tahoma, Verdana, Arial,
Helvetica, sans-serif; font-size: 11px;">
<br>
<b>MAC:{$clientmac} <br>
   IP:{$clientip} <br>
   SessionId: {$sid[0]} <br>
   Time Used: {$usedtime} minutes</b>
<br>
<B>You've been disconnected.</B>
</SPAN>

</BODY>
</HTML>

EOD;
/* The $macfilter can be removed safely since we first check if the
$clientmac is present, if not we fail */
} else if ($clientmac && portal_mac_fixed($clientmac)) {
    /* punch hole in ipfw for pass thru mac addresses */
    portal_allow($clientip, $clientmac, "unauthenticated");
    exit;

} else if ($clientmac && $radmac_enable &&
portal_mac_radius($clientmac,$clientip)) {
    /* radius functions handle everything so we exit here since we're done */
    exit;

} else if ($_POST['accept'] && $radius_enable) {

    if ($_POST['auth_user'] && $_POST['auth_pass']) {
        $auth_list =
radius($_POST['auth_user'],$_POST['auth_pass'],$clientip,$clientmac,"USER
LOGIN");

        if ($auth_list['auth_val'] == 1) {
           
captiveportal_logportalauth($_POST['auth_user'],$clientmac,$clientip,"ERROR",$auth_list['error']);
            portal_reply_page($redirurl, "error", $auth_list['error']);
        }
        else if ($auth_list['auth_val'] == 3) {
           
captiveportal_logportalauth($_POST['auth_user'],$clientmac,$clientip,"FAILURE",$auth_list['reply_message']);
            portal_reply_page($redirurl, "error", $auth_list['reply_message']);
        }
    } else {
        captiveportal_logportalauth($_POST['auth_user'],$clientmac,$clientip,"ERROR");
        portal_reply_page($redirurl, "error");
    }

} else if ($_POST['accept'] && $config['captiveportal']['auth_method']
== "local") {

    //check against local usermanager
    $userdb = &$config['captiveportal']['user'];

    $loginok = false;

    //erase expired accounts
    if (is_array($userdb)) {
        $moddb = false;
        for ($i = 0; $i < count($userdb); $i++) {
            if ($userdb[$i]['expirationdate'] && (strtotime("-1 day")
> strtotime($userdb[$i]['expirationdate']))) {
                unset($userdb[$i]);
                $moddb = true;
            }
        }
        if ($moddb)
            write_config();

        $userdb = &$config['captiveportal']['user'];

        for ($i = 0; $i < count($userdb); $i++) {
            if (($userdb[$i]['name'] == $_POST['auth_user']) &&
($userdb[$i]['password'] == md5($_POST['auth_pass']))) {
                $loginok = true;
                break;
            }
        }
    }

    if ($loginok){
        captiveportal_logportalauth($_POST['auth_user'],$clientmac,$clientip,"LOGIN");
        portal_allow($clientip, $clientmac,$_POST['auth_user']);
    } else {
        captiveportal_logportalauth($_POST['auth_user'],$clientmac,$clientip,"FAILURE");
        portal_reply_page($redirurl, "error");
    }
} else if ($_POST['accept'] && $clientip) {
    captiveportal_logportalauth("unauthenticated",$clientmac,$clientip,"ACCEPT");
    portal_allow($clientip, $clientmac, "unauthenticated");
} else {
    /* display captive portal page */
    portal_reply_page($redirurl, "login");
}

exit;

function portal_reply_page($redirurl, $type = null, $message = null) {
    global $g, $config;

    /* Get captive portal layout */
    if ($type == "login")
        $htmltext = file_get_contents("{$g['varetc_path']}/captiveportal.html");
    else
        $htmltext =
file_get_contents("{$g['varetc_path']}/captiveportal-error.html");

    /* substitute other variables */
    if (isset($config['captiveportal']['httpslogin']))
        $htmltext = str_replace("\$PORTAL_ACTION\$",
"https://{$config['captiveportal']['httpsname']}:8001/", $htmltext);
    else
        $htmltext = str_replace("\$PORTAL_ACTION\$",
"http://{$config['interfaces'][$config['captiveportal']['interface']]['ipaddr']}:8000/",
$htmltext);

    $htmltext = str_replace("\$PORTAL_REDIRURL\$",
htmlspecialchars($redirurl), $htmltext);
    $htmltext = str_replace("\$PORTAL_MESSAGE\$",
htmlspecialchars($message), $htmltext);

    echo $htmltext;

}

function portal_mac_fixed($clientmac) {
    global $g ;

    /* open captive portal mac db */
    if (file_exists("{$g['vardb_path']}/captiveportal_mac.db")) {
        $fd = @fopen("{$g['vardb_path']}/captiveportal_mac.db","r") ;
        if (!$fd) {
            return FALSE;
        }
        while (!feof($fd)) {
            $mac = trim(fgets($fd)) ;
            if(strcasecmp($clientmac, $mac) == 0) {
                fclose($fd) ;
                return TRUE ;
            }
        }
        fclose($fd) ;
    }
    return FALSE ;
}

function portal_mac_radius($clientmac,$clientip) {
    global $config ;

    $radmac_secret = $config['captiveportal']['radmac_secret'];

    /* authentication against the radius server */
    $auth_list =
radius($clientmac,$radmac_secret,$clientip,$clientmac,"MACHINE
LOGIN");
    if ($auth_list['auth_val'] == 2) {
        return TRUE;
    }
    return FALSE;
}

function portal_allow($clientip,$clientmac,$clientuser,$password =
null, $attributes = null)  {

    global $redirurl, $g, $config;

    // Ensure we create an array if we are missing attributes
    if (!is_array($attributes))
        $attributes = array();

    if ((isset($config['captiveportal']['noconcurrentlogins'])) &&
($clientuser != 'unauthenticated'))
        kick_concurrent_logins($clientuser);

    captiveportal_lock();

    $ruleno = captiveportal_get_next_ipfw_ruleno();

    /* if the pool is empty, return appropriate message and exit */
    if (is_null($ruleno)) {
        portal_reply_page($redirurl, "error", "System reached maximum
login capacity");
        captiveportal_unlock();
        exit;
    }

    /* generate unique session ID */
    $tod = gettimeofday();
    $sessionid = substr(md5(mt_rand() . $tod['sec'] . $tod['usec'] .
$clientip . $clientmac), 0, 16);

    /* add ipfw rules for layer 3 */
    exec("/sbin/ipfw add $ruleno set 2 skipto 50000 ip from $clientip
to any in");
    exec("/sbin/ipfw add $ruleno set 2 skipto 50000 ip from any to
$clientip out");

    /* add ipfw rules for layer 2 */
    if (!isset($config['captiveportal']['nomacfilter'])) {
        $l2ruleno = $ruleno + 10000;
        exec("/sbin/ipfw add $l2ruleno set 3 deny all from $clientip
to any not MAC any $clientmac layer2 in");
        exec("/sbin/ipfw add $l2ruleno set 3 deny all from any to
$clientip not MAC $clientmac any layer2 out");
    }

    /* read in client database */
    $cpdb = captiveportal_read_db();

    $radiusservers = captiveportal_get_radius_servers();

    /* find an existing entry and delete it */
    for ($i = 0; $i < count($cpdb); $i++) {
        if(!strcasecmp($cpdb[$i][2],$clientip)) {
            if(isset($config['captiveportal']['radacct_enable']) &&
isset($radiusservers[0])) {
                RADIUS_ACCOUNTING_STOP($cpdb[$i][1], // ruleno
                                       $cpdb[$i][4], // username
                                       $cpdb[$i][5], // sessionid
                                       $cpdb[$i][0], // start time
                                       $radiusservers[0]['ipaddr'],
                                       $radiusservers[0]['acctport'],
                                       $radiusservers[0]['key'],
                                       $cpdb[$i][2], // clientip
                                       $cpdb[$i][3], // clientmac
                                       13); // Port Preempted
            }
            mwexec("/sbin/ipfw delete " . $cpdb[$i][1] . " " .
($cpdb[$i][1]+10000));
            unset($cpdb[$i]);
            break;
        }
    }

    /* encode password in Base64 just in case it contains commas */
    $bpassword = base64_encode($password);
    $cpdb[] = array(time(), $ruleno, $clientip, $clientmac,
$clientuser, $sessionid, $bpassword,
            $attributes['session_timeout'],
            $attributes['idle_timeout'],
            $attributes['session_terminate_time']);

    /* rewrite information to database */
    captiveportal_write_db($cpdb);

    captiveportal_unlock();

    /* redirect user to desired destination */
    if ($url_redirection)
        $my_redirurl = $url_redirection;
    else if ($config['captiveportal']['redirurl'])
        $my_redirurl = $config['captiveportal']['redirurl'];
    else
        $my_redirurl = $redirurl;

    if(isset($config['captiveportal']['logoutwin_enable'])) {

        if (isset($config['captiveportal']['httpslogin']))
            $logouturl =
"https://{$config['captiveportal']['httpsname']}:8001/";
        else
            $logouturl =
"http://{$config['interfaces'][$config['captiveportal']['interface']]['ipaddr']}:8000/";

        echo <<<EOD
<HTML>
<HEAD><TITLE>Redirecting...</TITLE></HEAD>
<BODY>
<SPAN STYLE="font-family: Tahoma, Verdana, Arial, Helvetica,
sans-serif; font-size: 11px;">
<B>Redirecting to <A HREF="{$my_redirurl}">{$my_redirurl}</A>...</B>
</SPAN>
<SCRIPT LANGUAGE="JavaScript">
<!--
LogoutWin = window.open('', 'Logout',
'toolbar=0,scrollbars=0,location=0,statusbar=0,menubar=0,resizable=0,width=256,height=64');
if (LogoutWin) {
    LogoutWin.document.write('<HTML>');
    LogoutWin.document.write('<HEAD><TITLE>Logout</TITLE></HEAD>') ;
    LogoutWin.document.write('<BODY BGCOLOR="#435370">');
    LogoutWin.document.write('<DIV ALIGN="center" STYLE="color:
#ffffff; font-family: Tahoma, Verdana, Arial, Helvetica, sans-serif;
font-size: 11px;">') ;
    LogoutWin.document.write('<B>Click the button below to disconnect</B><P>');
    LogoutWin.document.write('<FORM METHOD="POST" ACTION="{$logouturl}">');
    LogoutWin.document.write('<INPUT NAME="logout_id" TYPE="hidden"
VALUE="{$sessionid}">');
    LogoutWin.document.write('<INPUT NAME="logout" TYPE="submit"
VALUE="Logout">');
    LogoutWin.document.write('</FORM>');
    LogoutWin.document.write('</DIV></BODY>');
    LogoutWin.document.write('</HTML>');
    LogoutWin.document.close();
}

document.location.href="{$my_redirurl}";
-->
</SCRIPT>
</BODY>
</HTML>

EOD;
    } else {
        header("Location: " . $my_redirurl);
    }

    return $sessionid;
}

/* Ensure that only one username is used by one client at a time
 * by Paul Taylor
 */
function kick_concurrent_logins($user) {

    captiveportal_lock();

    /* read database */
    $cpdb = captiveportal_read_db();

    captiveportal_unlock();

    if (isset($cpdb)) {
        /* find duplicate entry */
        for ($i = 0; $i < count($cpdb); $i++) {
            if ($cpdb[$i][4] == $user) {
                /* This user was already logged in */
                disconnect_client($cpdb[$i][5],"CONCURRENT LOGIN -
TERMINATING OLD SESSION",13);
            }
        }
    }
}

/*
	Log out via $clientmac rather than $sessionid
*/
function disconnect_client_bymac($clientmac) {
	captiveportal_lock();
	/*read databaase*/
	$cpdb = captiveportal_read_db();
	$id = array();
	/* find entry*/
	for ($i = 0; $i < count($cpdb); $i++) {
		if ($cpdb[$i][3] == $clientmac){
			$id[0] = $cpdb[$i][5]; //SessionId
			$id[1] = $cpdb[$i][0]; //Time
			//disconnect_client($sessionid);
			break;
		}
	}
	captiveportal_unlock();
	return $id;

}
/* remove a single client by session ID
   by Dinesh Nair
 */
function disconnect_client($sessionid, $logoutReason = "LOGOUT",
$term_cause = 1) {

    global $g, $config;

    captiveportal_lock();

    /* read database */
    $cpdb = captiveportal_read_db();

    $radiusservers = captiveportal_get_radius_servers();

    /* find entry */
    for ($i = 0; $i < count($cpdb); $i++) {
        if ($cpdb[$i][5] == $sessionid) {
            /* this client needs to be deleted - remove ipfw rules */
            if(isset($config['captiveportal']['radacct_enable']) &&
isset($radiusservers[0])) {
                RADIUS_ACCOUNTING_STOP($cpdb[$i][1], // ruleno
                                       $cpdb[$i][4], // username
                                       $cpdb[$i][5], // sessionid
                                       $cpdb[$i][0], // start time
                                       $radiusservers[0]['ipaddr'],
                                       $radiusservers[0]['acctport'],
                                       $radiusservers[0]['key'],
                                       $cpdb[$i][2], // clientip
                                       $cpdb[$i][3], // clientmac
                                       $term_cause);
            }
            mwexec("/sbin/ipfw delete " . $cpdb[$i][1] . " " .
($cpdb[$i][1]+10000));
            captiveportal_logportalauth($cpdb[$i][4],$cpdb[$i][3],$cpdb[$i][2],$logoutReason);
            unset($cpdb[$i]);
            break;
        }
    }

    /* rewrite information to database */
    captiveportal_write_db($cpdb);

    captiveportal_unlock();
}


?>




On 6/16/06, Jonathan De Graeve <Jonathan dot De dot Graeve at imelda dot be> wrote:
>
>
>
> Can it be that you forgot to attach the code to your email?
>
>
>
> Kind Regards,
>
>
>
> J.
>
>
> --
> Jonathan De Graeve
> Network/System Engineer
> Imelda vzw
> Informatica Dienst
> +32 15/50.52.98
> jonathan dot de dot graeve at imelda dot be
>
> ---------
> Always read the manual for the correct way to do things because the number
> of incorrect ways to do things is almost infinite
> ---------
>
> ________________________________
>
>
> Van: Arian Maleki [mailto:ahmaleki at gmail dot com]
> Verzonden: vrijdag 16 juni 2006 6:36
> Aan: m0n0wall dash dev at lists dot m0n0 dot ch
> Onderwerp: [m0n0wall-dev] Captive Portal Logout Link
>
>
>
>
>
> Here is some work I did to create a logout link rather than a logout pop-up.
>  To log out just enter
> http://<monowall-ip>:8000/logout.php.  Noticed others on
> the general mailing list requested something like this.  btw. Special thanks
> to everyone who maintains monowall nice project.  Also major props to the
> dude who added the captive portal code.  Very nice.
>
>
> Thanks,
>
>
> Arian
>
>
>
>