pfSense

<?php

    //

    // $Id$

    //

    // radius authentication v1.0 by Edwin Groothuis (edwin@mavetju.org)

    //

    // If you didn't get this file via http://www.mavetju.org, please

    // check for the availability of newer versions.

    //

    // See LICENSE for distribution issues. If this file isn't in

    // the distribution, please inform me about it.

    //

    // If you want to use this script, fill in the configuration in

    // radius_authentication.conf and call the function

    // RADIUS_AUTHENTICATION() with the username and password

    // provided by the user. If it returns a 2, the authentication

    // was successfull!

    // If you want to use this, make sure that you have raw sockets

    // enabled during compile-time: "./configure --enable-sockets".

	// This version has been modified by Dinesh Nair <dinesh@alphaque.com>

	// for use in the m0n0wall distribution http://m0n0.ch/wall/

	//

	// Changes include moving from raw sockets to fsockopen

	// and the removal of dependency on external conf file

	// An existing bug which resulted in a malformed RADIUS packet

	// was also fixed and patches submitted to Edwin. This bug would

	// have caused authentication to fail on every access.

function RADIUS_AUTHENTICATION($username,$password,$radiusip,$radiusport,$radiuskey) {

	$sharedsecret=$radiuskey ;

	# $debug = 1 ;

	exec("/bin/hostname", $nasHostname) ;

	if(!$nasHostname[0])

		$nasHostname[0] = "m0n0wall" ;

	$fd = @fsockopen("udp://$radiusip",$radiusport,$errno,$errstr,3) ;

	if(!$fd) 

		return 1 ; /* error return */

	/* set 5 second timeout on socket i/o */

	stream_set_timeout($fd, 5) ;

	if ($debug)

	    echo "<br>radius-port: $radiusport<br>radius-host: $radiusip<br>username: $username<hr>\n";

	$RA=pack("CCCCCCCCCCCCCCCC",				// auth code

	    1+rand()%255, 1+rand()%255, 1+rand()%255, 1+rand()%255,

	    1+rand()%255, 1+rand()%255, 1+rand()%255, 1+rand()%255,

	    1+rand()%255, 1+rand()%255, 1+rand()%255, 1+rand()%255,

	    1+rand()%255, 1+rand()%255, 1+rand()%255, 1+rand()%255);

	$encryptedpassword=Encrypt($password,$sharedsecret,$RA);

	$length=4+				// header

		16+				// auth code

		6+				// service type

		2+strlen($username)+		// username

		2+strlen($encryptedpassword)+	// userpassword

		2+strlen($nasHostname[0])+			// nasIdentifier

		6+				// nasPort

		6;				// nasPortType

	$thisidentifier=rand()%256;

	//          v   v v     v   v   v   v     v     v

	// Line #   1   2 3     4   5   6   7     8     E

	$data=pack("CCCCa*CCCCCCCCa*CCa*CCa*CCCCCCCCCCCC",

	    1,$thisidentifier,$length/256,$length%256,		// header

	    $RA,						// authcode

	    6,6,0,0,0,1,					// service type

	    1,2+strlen($username),$username,			// username

	    2,2+strlen($encryptedpassword),$encryptedpassword,	// userpassword

	    32,2+strlen($nasHostname[0]),$nasHostname[0],	// nasIdentifier

	    5,6,0,0,0,0,						// nasPort

	    61,6,0,0,0,15						// nasPortType = Ethernet

	    );

	if($debug) {

		echo "username is $username with len " . strlen($username) ."\n" ;

		echo "encryptedpassword is $encryptedpassword with len " . strlen($encryptedpassword) ."\n" ;

		echo "nasHostname is {$nasHostname[0]} with len " . strlen($nasHostname[0]) ."\n" ;

	}	

	$ret = fwrite($fd,$data) ;

	if( !$ret || ($ret != $length) ) 

		return 1; /* error return */

	if ($debug)

	    echo "<br>writing $length bytes<hr>\n";

	$readdata = fgets($fd,2) ; /* read 1 byte */

	$status = socket_get_status($fd) ;

	fclose($fd) ;

	if($status['timed_out'])

		$retvalue = 1 ;

	else

		$retvalue = ord($readdata) ;

	return $retvalue ;

	// 2 -> Access-Accept

	// 3 -> Access-Reject

	// See RFC2865 for this.

}

function Encrypt($password,$key,$RA) {

	global $debug;

	$keyRA=$key.$RA;

	if ($debug)

	    echo "<br>key: $key<br>password: $password<hr>\n";

	$md5checksum=md5($keyRA);

	$output="";

	for ($i=0;$i<=15;$i++) {

	    if (2*$i>strlen($md5checksum)) $m=0; else $m=hexdec(substr($md5checksum,2*$i,2));

	    if ($i>strlen($keyRA)) $k=0; else $k=ord(substr($keyRA,$i,1));

	    if ($i>strlen($password)) $p=0; else $p=ord(substr($password,$i,1));

	    $c=$m^$p;

	    $output.=chr($c);

	}

	return $output;

}

?>