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<?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.
// This version of radius_authentication.inc has been modified by
// Rob Parker <rob.parker@keycom.co.uk>. Changes made include:
// * move to fread() from fgets() to ensure binary safety
// * ability to read back specific attributes from a
// RADIUS Access-Accept packet
// * these attributes (in this version, Nomadix-Bw-Up and -Down,
// which are Nomadix vendor specific attributes to be passed back
// to index.php of m0n0wall to create dummynet rules for per-user
// radius-based bandwidth restriction.
// * IMPORTANT NOTE: this function no longer returns a simple integer
// of '2' for Access-Accept, and '3' for Access-Deny. It will return
// x/y/z, where x = 2 or 3 (Accept or Deny), y = up bandwidth, if
// enabled in web gui, and z = down bandwidth. These will be empty if
// per user bw is disabled in webgui.
// * these changes are (c) 2004 Keycom PLC.
function RADIUS_AUTHENTICATION($username,$password,$radiusip,$radiusport,$radiuskey) {
global $config;
//radius database, hack this if we need to
$radius_db[1]=="Nomadix-Bw-Up";
$radius_db[2]=="Nomadix-Bw-Down";
$radius_db[5]=="Nomadix-Expiration";
$sharedsecret=$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";
//RADIUS attributes returned in Access-Accept packet.
#turn off magic quotes so we're binary-safe on fread.
set_magic_quotes_runtime(0);
$readdata = fread($fd,1024);
$pack_upack = unpack("Ctype/Cuid/nlength/A16resp/A*payload",$readdata);
if($pack_upack[type]==2) {
//only for 'Access-Accept' packets, otherwise throw back the number so error page is shown
$payload_upack = unpack("Cnum/Clen/C*value",$pack_upack[payload]);
$used_upack = $payload_upack;
while(count($used_upack)>=1) {
//the payload contains two initial packets we need to record (number, and payload)
$attribute_number++;
$packet_type=array_shift($used_upack); //push the type off
$attributes[$attribute_number][]=$packet_type;
$packet_length=array_shift($used_upack); //push the length off
$attributes[$attribute_number][]=$packet_length;
//iterate until the end of this attribute
for($n=1;$n<=$packet_length-2;$n+=1) {
$attributes[$attribute_number][]=array_shift($used_upack);
}
}
//at this stage, $attribute contains a list of ALL attributes that were sent (well, the first 1kbyte of them anyway,
//change fread above to alter the quantity of data read from the socket.
//we're only interested in two specific nomadix (3309) attributes (1 and 2, Bw-Up and Bw-Down)
for($n=1;$n<=count($attributes);$n+=1) {
if($attributes[$n][0]=="26") { //VSA attribs
if((($attributes[$n][4]*256)+$attributes[$n][5])=="3309") { //just nomadix
switch($attributes[$n][6]) { //nomadix packet type
//we do this *256 because otherwise we'd need to unpack the packet
//again with a different packet format. which is a waste of time for now.
case "1":
$bw_up = 0;
$bw_up += $attributes[$n][10]*256;
$bw_up += $attributes[$n][11];
if ($debug) {echo ">>VSA: Nomadix-Bw-Up=" . $bw_up . "kbit\n";}
break;
case "2":
$bw_down = 0;
$bw_down += $attributes[$n][10]*256;
$bw_down += $attributes[$n][11];
if ($debug) {echo ">>VSA: Nomadix-Bw-Down=" . $bw_down . "kbit\n";}
break;
default:
if ($debug) {echo ">>VSA: Unknown Nomadix Packet (" . $attributes[$n][6] . ")!\n";}
}
}
}
}
//end RADIUS attribute return code.
$status = socket_get_status($fd) ;
fclose($fd) ;
if($status['timed_out'])
$retvalue = 1 ;
else
$retvalue = $pack_upack[type];
if($debug) {
switch($retvalue) {
case 1:
echo "Socket Failure!\n";
break;
case 2:
echo "Access-Accept!\n";
break;
case 3:
echo "Access-Reject!\n";
break;
default:
echo "Unknown Reply!\n";
}
}
//what happens if there's no Nomadix attributes set, but the user has this turned on?
//we give them a default of 64kbit. this should be an option in the webgui too.
if(!isset($bw_up)) {
//go for default bw up
$bw_up==$config['captiveportal']['bwdefaultup'];
if(!isset($bw_up)) {
$bw_up=64;
}
}
if(!isset($bw_down)) {
//go for default bw down
$bw_down==$config['captiveportal']['bwdefaultdn'];
if(!isset($bw_down)) {
$bw_down=64;
}
}
//whilst we're debugging, we're also going to syslog this
syslog(LOG_INFO,"Authenticated user $username. Setting bandwidth to $bwdown/$bwup KBit/s");
return $retvalue . "/" . $bw_up . "/" . $bw_down;
} else {
//we're returning 5kbit/s each way here, but really it doesn't matter
//if it's a 3, it's Access-Reject anyway, so the user will actually get
//nothing at all. :)
syslog(LOG_INFO,"Authentication failed for $username");
return "3/5/5";
}
// 2 -> Access-Accept
// 3 -> Access-Reject
// See RFC2865 for this.
}
function Encrypt($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;
}
?>
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