RADIUS.php

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<?php
/* vim: set expandtab tabstop=4 shiftwidth=4: */
/*
Copyright (c) 2003, Michael Bretterklieber <michael@bretterklieber.com>
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.
3. The names of the authors may not be used to endorse or promote products 
   derived from this software without specific prior written permission.
 
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 COPYRIGHT OWNER OR CONTRIBUTORS 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.
 
This code cannot simply be copied and put under the GNU Public License or 
any other GPL-like (LGPL, GPL2) License.
 
    $Id: RADIUS.php,v 1.8 2007/03/27 17:28:44 mbretter Exp $
*/
 
require_once 'PEAR.php';
 
PEAR::loadExtension('radius');
 
class Auth_RADIUS extends PEAR {
 
    var $_servers  = array();
    
    var $_configfile = null;
    
    var $res = null;
    
    var $username = null;
 
    var $password = null;
    
    var $attributes = array();
    
    var $rawAttributes = array();
 
    var $rawVendorAttributes = array();    
 
    var $useStandardAttributes = true;
    
    function Auth_RADIUS() 
    {
        $this->PEAR();
    }
    
    function addServer($servername = 'localhost', $port = 0, $sharedSecret = 'testing123', $timeout = 3, $maxtries = 3) 
    {
        $this->_servers[] = array($servername, $port, $sharedSecret, $timeout, $maxtries);    
    }
    
    function getError() 
    {
        return radius_strerror($this->res);
    }
    
    function setConfigfile($file) 
    {
        $this->_configfile = $file;
    }
 
    function putAttribute($attrib, $value, $type = null) 
    {
        if ($type == null) {
            $type = gettype($value);
        }
 
        switch ($type) {
        case 'integer':
        case 'double':
            return radius_put_int($this->res, $attrib, $value);
        
        case 'addr':
            return radius_put_addr($this->res, $attrib, $value);
            
        case 'string':
        default:
            return radius_put_attr($this->res, $attrib, $value);
        }
 
    }
    
    function putVendorAttribute($vendor, $attrib, $value, $type = null) 
    {
        
        if ($type == null) {
            $type = gettype($value);
        }
        
        switch ($type) {
        case 'integer':
        case 'double':
            return radius_put_vendor_int($this->res, $vendor, $attrib, $value);
        
        case 'addr':
            return radius_put_vendor_addr($this->res, $vendor,$attrib, $value);
            
        case 'string':
        default:
            return radius_put_vendor_attr($this->res, $vendor, $attrib, $value);
        }
        
    }    
 
    function dumpAttributes()
    {
        foreach ($this->attributes as $name => $data) {
            echo "$name:$data<br>\n";
        }
    }
    
    function open() 
    {
    }
 
    function createRequest()
    {
    }
    
    function putStandardAttributes()
    {
        if (!$this->useStandardAttributes)
                return;
 
        if (isset($_SERVER)) {
            $var = &$_SERVER;
        } else {
            $var = &$GLOBALS['HTTP_SERVER_VARS'];
        }
                
        $this->putAttribute(RADIUS_NAS_IDENTIFIER, isset($var['HTTP_HOST']) ? $var['HTTP_HOST'] : 'localhost');
        $this->putAttribute(RADIUS_NAS_PORT_TYPE, RADIUS_VIRTUAL);
        $this->putAttribute(RADIUS_SERVICE_TYPE, RADIUS_FRAMED);
        $this->putAttribute(RADIUS_FRAMED_PROTOCOL, RADIUS_PPP);
        $this->putAttribute(RADIUS_CALLING_STATION_ID, isset($var['REMOTE_HOST']) ? $var['REMOTE_HOST'] : '127.0.0.1');
    }
    
    function putAuthAttributes()
    {
        if (isset($this->username)) {
            $this->putAttribute(RADIUS_USER_NAME, $this->username);        
        }
    }
    
    function putServer($servername, $port = 0, $sharedsecret = 'testing123', $timeout = 3, $maxtries = 3) 
    {
        if (!radius_add_server($this->res, $servername, $port, $sharedsecret, $timeout, $maxtries)) {
            return false;
        }
        return true;
    }
    
    function putConfigfile($file) 
    {
        if (!radius_config($this->res, $file)) {
            return false;
        }
        return true;
    }    
        
    function start()
    {
        if (!$this->open()) {
            return false;
        }
        
        foreach ($this->_servers as $s) {
                // Servername, port, sharedsecret, timeout, retries
            if (!$this->putServer($s[0], $s[1], $s[2], $s[3], $s[4])) {
                return false;
            }
        }
        
        if (!empty($this->_configfile)) {
            if (!$this->putConfigfile($this->_configfile)) {
                return false;
            }
        }
        
        $this->createRequest();
        $this->putStandardAttributes();
        $this->putAuthAttributes();
        return true;
    }
    
    function send()
    {
        $req = radius_send_request($this->res);
        if (!$req) {
            return $this->raiseError('Error sending request: ' . $this->getError());
        }
 
        switch($req) {
        case RADIUS_ACCESS_ACCEPT:
            if (is_subclass_of($this, 'auth_radius_acct')) {
                return $this->raiseError('RADIUS_ACCESS_ACCEPT is unexpected for accounting');
            }
            return true;
 
        case RADIUS_ACCESS_REJECT:
            return false;
            
        case RADIUS_ACCOUNTING_RESPONSE:
            if (is_subclass_of($this, 'auth_radius_pap')) {
                return $this->raiseError('RADIUS_ACCOUNTING_RESPONSE is unexpected for authentication');
            }
            return true;
 
        default:
            return $this->raiseError("Unexpected return value: $req");
        }    
        
    }
 
    function getAttributes()
    {
 
        while ($attrib = radius_get_attr($this->res)) {
 
            if (!is_array($attrib)) {
                return false;
            }        
 
            $attr = $attrib['attr'];
            $data = $attrib['data'];
 
            $this->rawAttributes[$attr] = $data;
 
            switch ($attr) {
            case RADIUS_FRAMED_IP_ADDRESS:
                $this->attributes['framed_ip'] = radius_cvt_addr($data);
                break;
 
            case RADIUS_FRAMED_IP_NETMASK:
                $this->attributes['framed_mask'] = radius_cvt_addr($data);
                break;
 
            case RADIUS_FRAMED_MTU:
                $this->attributes['framed_mtu'] = radius_cvt_int($data);
                break;
 
            case RADIUS_FRAMED_COMPRESSION:
                $this->attributes['framed_compression'] = radius_cvt_int($data);
                break;
 
            case RADIUS_SESSION_TIMEOUT:
                $this->attributes['session_timeout'] = radius_cvt_int($data);
                break;
 
            case RADIUS_IDLE_TIMEOUT:
                $this->attributes['idle_timeout'] = radius_cvt_int($data);
                break;
 
            case RADIUS_SERVICE_TYPE:
                $this->attributes['service_type'] = radius_cvt_int($data);
                break;
 
            case RADIUS_CLASS:
                $this->attributes['class'] = radius_cvt_string($data);
                break;
 
            case RADIUS_FRAMED_PROTOCOL:
                $this->attributes['framed_protocol'] = radius_cvt_int($data);
                break;
 
            case RADIUS_FRAMED_ROUTING:
                $this->attributes['framed_routing'] = radius_cvt_int($data);
                break;
 
            case RADIUS_FILTER_ID:
                $this->attributes['filter_id'] = radius_cvt_string($data);
                break;
 
            case RADIUS_REPLY_MESSAGE:
                $this->attributes['reply_message'] = radius_cvt_string($data);
                break;
 
            case RADIUS_VENDOR_SPECIFIC:
                $attribv = radius_get_vendor_attr($data);
                if (!is_array($attribv)) {
                    return false;
                }
                    
                $vendor = $attribv['vendor'];
                $attrv = $attribv['attr'];
                $datav = $attribv['data'];
                
                $this->rawVendorAttributes[$vendor][$attrv] = $datav;
 
                if ($vendor == RADIUS_VENDOR_MICROSOFT) {
 
                    switch ($attrv) {
                    case RADIUS_MICROSOFT_MS_CHAP2_SUCCESS:
                        $this->attributes['ms_chap2_success'] = radius_cvt_string($datav);
                        break;
 
                    case RADIUS_MICROSOFT_MS_CHAP_ERROR:
                        $this->attributes['ms_chap_error'] = radius_cvt_string(substr($datav,1));
                        break;
 
                    case RADIUS_MICROSOFT_MS_CHAP_DOMAIN:
                        $this->attributes['ms_chap_domain'] = radius_cvt_string($datav);
                        break;
 
                    case RADIUS_MICROSOFT_MS_MPPE_ENCRYPTION_POLICY:
                        $this->attributes['ms_mppe_encryption_policy'] = radius_cvt_int($datav);
                        break;
 
                    case RADIUS_MICROSOFT_MS_MPPE_ENCRYPTION_TYPES:
                        $this->attributes['ms_mppe_encryption_types'] = radius_cvt_int($datav);
                        break;
 
                    case RADIUS_MICROSOFT_MS_CHAP_MPPE_KEYS:
                        $demangled = radius_demangle($this->res, $datav);
                        $this->attributes['ms_chap_mppe_lm_key'] = substr($demangled, 0, 8);
                        $this->attributes['ms_chap_mppe_nt_key'] = substr($demangled, 8, RADIUS_MPPE_KEY_LEN);
                        break;
 
                    case RADIUS_MICROSOFT_MS_MPPE_SEND_KEY:
                        $this->attributes['ms_chap_mppe_send_key'] = radius_demangle_mppe_key($this->res, $datav);
                        break;
 
                    case RADIUS_MICROSOFT_MS_MPPE_RECV_KEY:
                        $this->attributes['ms_chap_mppe_recv_key'] = radius_demangle_mppe_key($this->res, $datav);
                        break;
 
                    case RADIUS_MICROSOFT_MS_PRIMARY_DNS_SERVER:
                        $this->attributes['ms_primary_dns_server'] = radius_cvt_string($datav);
                        break;
                    }
                }
                break;
                
            }
        }    
 
        return true;
    }
    
    function close()
    {
        if ($this->res != null) {
            radius_close($this->res);
            $this->res = null;
        }
        $this->username = str_repeat("\0", strlen($this->username));
        $this->password = str_repeat("\0", strlen($this->password));
    }
    
}
 
class Auth_RADIUS_PAP extends Auth_RADIUS 
{
 
    function Auth_RADIUS_PAP($username = null, $password = null)
    {
        $this->Auth_RADIUS();
        $this->username = $username;
        $this->password = $password;
    }
    
    function open() 
    {
        $this->res = radius_auth_open();
        if (!$this->res) {
            return false;
        }
        return true;
    }
    
    function createRequest()
    {
        if (!radius_create_request($this->res, RADIUS_ACCESS_REQUEST)) {
            return false;
        }
        return true;
    }
 
    function putAuthAttributes()
    {
        if (isset($this->username)) {
            $this->putAttribute(RADIUS_USER_NAME, $this->username);        
        }
        if (isset($this->password)) {
            $this->putAttribute(RADIUS_USER_PASSWORD, $this->password);
        }
    }
 
}
 
class Auth_RADIUS_CHAP_MD5 extends Auth_RADIUS_PAP
{
    var $challenge = null;
 
    var $response = null;
    
    var $chapid = 1;
    
    function Auth_RADIUS_CHAP_MD5($username = null, $challenge = null, $chapid = 1)
    {
        $this->Auth_RADIUS_PAP();
        $this->username = $username;
        $this->challenge = $challenge;
        $this->chapid = $chapid;
    }
    
    function putAuthAttributes()
    {
        if (isset($this->username)) {
            $this->putAttribute(RADIUS_USER_NAME, $this->username);        
        }
        if (isset($this->response)) {
            $response = pack('C', $this->chapid) . $this->response;
            $this->putAttribute(RADIUS_CHAP_PASSWORD, $response);
        }
        if (isset($this->challenge)) {
            $this->putAttribute(RADIUS_CHAP_CHALLENGE, $this->challenge);
        }
    }
    
    function close()
    {
        Auth_RADIUS_PAP::close();
        $this->challenge =  str_repeat("\0", strlen($this->challenge));
        $this->response =  str_repeat("\0", strlen($this->response));
    }    
    
}
 
class Auth_RADIUS_MSCHAPv1 extends Auth_RADIUS_CHAP_MD5 
{
    var $lmResponse = null;
 
    var $flags = 1;
    
    function putAuthAttributes()
    {
        if (isset($this->username)) {
            $this->putAttribute(RADIUS_USER_NAME, $this->username);        
        }
        if (isset($this->response) || isset($this->lmResponse)) {
            $lmResp = isset($this->lmResponse) ? $this->lmResponse : str_repeat ("\0", 24);
            $ntResp = isset($this->response)   ? $this->response :   str_repeat ("\0", 24);
            $resp = pack('CC', $this->chapid, $this->flags) . $lmResp . $ntResp;
            $this->putVendorAttribute(RADIUS_VENDOR_MICROSOFT, RADIUS_MICROSOFT_MS_CHAP_RESPONSE, $resp);
        }
        if (isset($this->challenge)) {        
            $this->putVendorAttribute(RADIUS_VENDOR_MICROSOFT, RADIUS_MICROSOFT_MS_CHAP_CHALLENGE, $this->challenge);
        }
    }    
}
 
class Auth_RADIUS_MSCHAPv2 extends Auth_RADIUS_MSCHAPv1 
{
    var $challenge = null;
    
    var $peerChallenge = null;
 
    function putAuthAttributes()
    {
        if (isset($this->username)) {
            $this->putAttribute(RADIUS_USER_NAME, $this->username);        
        }
        if (isset($this->response) && isset($this->peerChallenge)) {
            // Response: chapid, flags (1 = use NT Response), Peer challenge, reserved, Response        
            $resp = pack('CCa16a8a24',$this->chapid , 1, $this->peerChallenge, str_repeat("\0", 8), $this->response);        
            $this->putVendorAttribute(RADIUS_VENDOR_MICROSOFT, RADIUS_MICROSOFT_MS_CHAP2_RESPONSE, $resp);
        }
        if (isset($this->challenge)) {
            $this->putVendorAttribute(RADIUS_VENDOR_MICROSOFT, RADIUS_MICROSOFT_MS_CHAP_CHALLENGE, $this->challenge);
        }
    }    
    
    function close()
    {
        Auth_RADIUS_MSCHAPv1::close();
        $this->peerChallenge = str_repeat("\0", strlen($this->peerChallenge));
    }       
}
 
class Auth_RADIUS_Acct extends Auth_RADIUS 
{
    var $authentic = null;
 
    var $status_type = null;
 
    var $session_time = null;
 
    var $session_id = null;
    
    function Auth_RADIUS_Acct()
    {
        $this->Auth_RADIUS();
        
        if (isset($_SERVER)) {
            $var = &$_SERVER;
        } else {
            $var = &$GLOBALS['HTTP_SERVER_VARS'];
        }
 
        $this->session_id = sprintf("%s:%d-%s", isset($var['REMOTE_ADDR']) ? $var['REMOTE_ADDR'] : '127.0.0.1' , getmypid(), get_current_user());
    }
 
    function open() 
    {
        $this->res = radius_acct_open();
        if (!$this->res) {
            return false;
        }
        return true;
    }
 
    function createRequest()
    {
        if (!radius_create_request($this->res, RADIUS_ACCOUNTING_REQUEST)) {
            return false;
        }
        return true;
    }   
   
    function putAuthAttributes()
    {
        $this->putAttribute(RADIUS_ACCT_SESSION_ID, $this->session_id);
        $this->putAttribute(RADIUS_ACCT_STATUS_TYPE, $this->status_type);
        if (isset($this->session_time) && $this->status_type == RADIUS_STOP) {
            $this->putAttribute(RADIUS_ACCT_SESSION_TIME, $this->session_time);
        }
        if (isset($this->authentic)) {
            $this->putAttribute(RADIUS_ACCT_AUTHENTIC, $this->authentic);
        }
        
    }    
    
}
 
class Auth_RADIUS_Acct_Start extends Auth_RADIUS_Acct 
{
    var $status_type = RADIUS_START;
}
 
class Auth_RADIUS_Acct_Stop extends Auth_RADIUS_Acct
{
    var $status_type = RADIUS_STOP;
}
 
if (!defined('RADIUS_UPDATE'))
    define('RADIUS_UPDATE', 3);
 
class Auth_RADIUS_Acct_Update extends Auth_RADIUS_Acct
{
    var $status_type = RADIUS_UPDATE;
}
 
?>