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<?php
//
// +----------------------------------------------------------------------+
// | PHP Version 5                                                        |
// +----------------------------------------------------------------------+
// | Copyright (c) 1997-2012 The PHP Group                                |
// +----------------------------------------------------------------------+
// | This source file is subject to version 3.01 of the PHP license,      |
// | that is bundled with this package in the file LICENSE, and is        |
// | available at through the world-wide-web at                           |
// | http://www.php.net/license/3_01.txt.                                 |
// | If you did not receive a copy of the PHP license and are unable to   |
// | obtain it through the world-wide-web, please send a note to          |
// | license@php.net so we can mail you a copy immediately.               |
// +----------------------------------------------------------------------+
// | Authors: Martin Jansen <mj@php.net>                                  |
// |          Rui Hirokawa <hirokawa@php.net>                             |
// |          David Costa  <gurugeek@php.net>                             |
// +----------------------------------------------------------------------+
//
//  $Id$ 
//

require_once "Auth/Auth.php";

define('AUTH_HTTP_NONCE_TIME_LEN'16);
define('AUTH_HTTP_NONCE_HASH_LEN'32);

// {{{ class Auth_HTTP

/**
 * PEAR::Auth_HTTP
 *
 * The PEAR::Auth_HTTP class provides methods for creating an
 * HTTP authentication system based on RFC-2617 using PHP.
 *
 * Instead of generating an HTML driven form like PEAR::Auth
 * does, this class sends header commands to the clients which
 * cause them to present a login box like they are e.g. used
 * in Apache's .htaccess mechanism.
 *
 * This class requires the PEAR::Auth package.
 *
 * @notes The HTTP Digest Authentication part is based on
 *  authentication class written by Tom Pike <tom.pike@xiven.com>
 *
 * @author  Martin Jansen <mj@php.net>
 * @author  Rui Hirokawa <hirokawa@php.net>
 * @author  David Costa <gurugeek@php.net>
 * @package Auth_HTTP
 * @extends Auth
 * @version $Revision$
 */
class Auth_HTTP extends Auth
{
   
    
// {{{ properties

    /**
     * Authorization method: 'basic' or 'digest'
     *
     * @access public
     * @var    string
     */
    
var $authType 'basic';
 
    
/**
     * Name of the realm for Basic Authentication
     *
     * @access public
     * @var    string
     * @see    drawLogin()
     */
    
var $realm "protected area";

    
/**
     * Text to send if user hits cancel button
     *
     * @access public
     * @var    string
     * @see    drawLogin()
     */
    
var $CancelText "Error 401 - Access denied";

    
/**
     * option array
     *
     * @access public
     * @var    array
     */
    
var $options = array();

    
/**
     * flag to indicate the nonce was stale. 
     *
     * @access public
     * @var    bool
     */
    
var $stale false;

    
/**
     * opaque string for digest authentication
     *
     * @access public
     * @var    string
     */
    
var $opaque 'dummy';

    
/**
     * digest URI
     *
     * @access public
     * @var    string
     */
    
var $uri '';

    
/**
     * authorization info returned by the client
     *
     * @access public
     * @var    array
     */
    
var $auth = array();

    
/**
     * next nonce value
     *
     * @access public
     * @var    string
     */
    
var $nextNonce '';

    
/**
     * nonce value
     *
     * @access public
     * @var    string
     */
    
var $nonce '';

    
/**
     * Holds a reference to the global server variable
     * @var array
     */
    
var $server;

    
/**
     * Holds a reference to the global post variable
     * @var array
     */
    
var $post;

    
/**
     * Holds a reference to the global cookie variable
     * @var array
     */
    
var $cookie;


    
// }}}
    // {{{ Constructor

    /**
     * Constructor
     *
     * @param string    Type of the storage driver
     * @param mixed     Additional options for the storage driver
     *                  (example: if you are using DB as the storage
     *                   driver, you have to pass the dsn string here)
     *
     * @return void
     */
    
function Auth_HTTP($storageDriver$options ''
    {
        
/* set default values for options */
        
$this->options = array('cryptType' => 'md5',
                               
'algorithm' => 'MD5',
                               
'qop' => 'auth-int,auth',
                               
'opaquekey' => 'moo',
                               
'noncekey' => 'moo',
                               
'digestRealm' => 'protected area',
                               
'forceDigestOnly' => false,
                               
'nonceLife' => 300,
                               
'sessionSharing' => false,
                               );
        
        if (!empty(
$options['authType'])) {
            
$this->authType strtolower($options['authType']);
        }
        
        if (
is_array($options)) {
            foreach(
$options as $key => $value) {
                if (
array_key_exists$key$this->options)) {
                    
$this->options[$key] = $value;
                }
            }
        
            if (!empty(
$this->options['opaquekey'])) {
                
$this->opaque md5($this->options['opaquekey']);
            }
        }
        
        
$this->Auth($storageDriver$options);
    }
    
    
// }}}
    // {{{ assignData()

    /**
     * Assign values from $PHP_AUTH_USER and $PHP_AUTH_PW or 'Authorization' header
     * to internal variables and sets the session id based
     * on them
     *
     * @access public
     * @return void
     */
    
function assignData()
    {
        if (
method_exists($this'_importGlobalVariable')) {
            
$this->server = &$this->_importGlobalVariable('server');
        }
        
        
        if (
$this->authType == 'basic') {
            if (!empty(
$this->server['PHP_AUTH_USER'])) {
                
$this->username $this->server['PHP_AUTH_USER'];
            }
            
            if (!empty(
$this->server['PHP_AUTH_PW'])) {
                
$this->password $this->server['PHP_AUTH_PW'];
            }
            
            
/**
             * Try to get authentication information from IIS
             */
            
if  (empty($this->username) && empty($this->password)) {
                if (!empty(
$this->server['HTTP_AUTHORIZATION'])) {
                    list(
$this->username$this->password) = 
                        
explode(':'base64_decode(substr($this->server['HTTP_AUTHORIZATION'], 6)));
                }
            }
        } elseif (
$this->authType == 'digest') {
            
$this->username '';
            
$this->password '';

            
$this->digest_header null;
            if (!empty(
$this->server['PHP_AUTH_DIGEST'])) {
                
$this->digest_header $this->server['PHP_AUTH_DIGEST'];
                
$headers getallheaders();
            } else {
                
$headers getallheaders();
                if(isset(
$headers['Authorization']) && !empty($headers['Authorization'])) {
                    
$this->digest_header substr($headers['Authorization'],
                                                  
strpos($headers['Authorization'],' ')+1);
                }
            }

            if(
$this->digest_header) {
                
$authtemp explode(','$this->digest_header);
                
$auth = array();
                foreach(
$authtemp as $key => $value) {
                    
$value trim($value);
                    if(
strpos($value,'=') !== false) {
                        
$lhs substr($value,0,strpos($value,'='));
                        
$rhs substr($value,strpos($value,'=')+1);
                        if(
substr($rhs,0,1) == '"' && substr($rhs,-1,1) == '"') {
                            
$rhs substr($rhs,1,-1);
                        }
                        
$auth[$lhs] = $rhs;
                    }
                }
            }
            if (!isset(
$auth['uri']) || !isset($auth['realm'])) {
                return;
            }
            
            if (
$this->selfURI() == $auth['uri']) {
                
$this->uri $auth['uri'];
                if (
substr($headers['Authorization'],0,7) == 'Digest ') {
                    
                    
$this->authType 'digest';

                    if (!isset(
$auth['nonce']) || !isset($auth['username']) || 
                  !isset(
$auth['response']) || !isset($auth['qop']) || 
                  !isset(
$auth['nc']) || !isset($auth['cnonce'])){
                        return;
                    }

               if (
$auth['qop'] != 'auth' && $auth['qop'] != 'auth-int') {
                        return;
               }
                    
                    
$this->stale $this->_judgeStale($auth['nonce']);

               if (
$this->nextNonce == false) {
                  return;
               }

                    
$this->username $auth['username'];
                    
$this->password $auth['response'];
                    
$this->auth['nonce'] = $auth['nonce'];
                    
               
$this->auth['qop'] = $auth['qop'];
               
$this->auth['nc'] = $auth['nc'];
               
$this->auth['cnonce'] = $auth['cnonce'];

                    if (isset(
$auth['opaque'])) {
                        
$this->auth['opaque'] = $auth['opaque'];
                    }
                    
                } elseif (
substr($headers['Authorization'],0,6) == 'Basic ') {
                    if (
$this->options['forceDigestOnly']) {
                        return; 
// Basic authentication is not allowed.
                    
}
                    
                    
$this->authType 'basic';
                    list(
$username$password) = 
                        
explode(':',base64_decode(substr($headers['Authorization'],6)));
                    
$this->username $username;
                    
$this->password $password;
                }
            }
        } else {
            include_once 
'PEAR.php';
            return 
PEAR::throwError('authType is invalid.');
        }

        if (
$this->options['sessionSharing'] && 
            isset(
$this->username) && isset($this->password)) {
            
session_id(md5('Auth_HTTP' $this->username $this->password));
        }
        
        
/**
         * set sessionName for AUTH, so that the sessionName is different 
         * for distinct realms 
         */
         
$this->_sessionName "_authhttp".md5($this->realm);
    }

    
// }}}
    // {{{ login()

    /**
     * Login function
     *
     * @access private
     * @return void
     */
    
function login() 
    {
        
$login_ok false;
        if (
method_exists($this'_loadStorage')) {
            
$this->_loadStorage();
        }
        
$this->storage->_auth_obj->_sessionName =& $this->_sessionName;

        
/**
         * When the user has already entered a username,
         * we have to validate it.
         */
        
if (!empty($this->username) && !empty($this->password)) {
            if (
$this->authType == 'basic' && !$this->options['forceDigestOnly']) {
                if (
true === $this->storage->fetchData($this->username$this->password)) {
                    
$login_ok true;
                }
            } else { 
/* digest authentication */

                
if (!$this->getAuth() || $this->getAuthData('a1') == null) {
                    
/* 
                     * note:
                     *  - only PEAR::DB is supported as container.
                     *  - password should be stored in container as plain-text 
                     *    (if $options['cryptType'] == 'none') or 
                     *     A1 hashed form (md5('username:realm:password')) 
                     *    (if $options['cryptType'] == 'md5')
                     */
                    
$dbs $this->storage;
                    if (!
DB::isConnection($dbs->db)) {
                        
$dbs->_connect($dbs->options['dsn']);
                    }
                    
                    
$query 'SELECT '.$dbs->options['passwordcol']." FROM ".$dbs->options['table'].
                        
' WHERE '.$dbs->options['usernamecol']." = '".
                        
$dbs->db->quoteString($this->username)."' ";
                    
                    
$pwd $dbs->db->getOne($query); // password stored in container.
                    
                    
if (DB::isError($pwd)) {
                        include_once 
'PEAR.php';
                        return 
PEAR::throwError($pwd->getMessage(), $pwd->getCode());
                    }
                    
                    if (
$this->options['cryptType'] == 'none') {
                        
$a1 md5($this->username.':'.$this->options['digestRealm'].':'.$pwd);
                    } else {
                        
$a1 $pwd;
                    }
                    
                    
$this->setAuthData('a1'$a1true);
                } else {
                    
$a1 $this->getAuthData('a1');
                }
                
                
$login_ok $this->validateDigest($this->password$a1);
                if (
$this->nextNonce == false) {
                    
$login_ok false;
                }
            }
            
            if (!
$login_ok && is_callable($this->loginFailedCallback)) {
                
call_user_func($this->loginFailedCallback,$this->username$this);
            }
        }
        
        if (!empty(
$this->username) && $login_ok) {
            
$this->setAuth($this->username);
            if (
is_callable($this->loginCallback)) {
                
call_user_func($this->loginCallback,$this->username$this);
            }
        }
        
        
/**
         * If the login failed or the user entered no username,
         * output the login screen again.
         */
        
if (!empty($this->username) && !$login_ok) {
            
$this->status AUTH_WRONG_LOGIN;
        }
        
        if ((empty(
$this->username) || !$login_ok) && $this->showLogin) {
            
$this->drawLogin($this->storage->activeUser);
            return;
        }

      if (!empty(
$this->username) && $login_ok && $this->authType == 'digest'
         
&& $this->auth['qop'] == 'auth') { 
         
$this->authenticationInfo();
      }
    }
    
    
// }}}
    // {{{ drawLogin()

    /**
     * Launch the login box
     *
     * @param  string $username  Username
     * @return void
     * @access private
     */
    
function drawLogin($username "")
    {
        
/**
         * Send the header commands
         */
        
if ($this->authType == 'basic') {
            
header("WWW-Authenticate: Basic realm=\"".$this->realm."\"");
            
header('HTTP/1.0 401 Unauthorized');            
        } else if (
$this->authType == 'digest') {
            
$this->nonce $this->_getNonce();

            
$wwwauth 'WWW-Authenticate: Digest ';
            
$wwwauth .= 'qop="'.$this->options['qop'].'", ';
            
$wwwauth .= 'algorithm='.$this->options['algorithm'].', ';
            
$wwwauth .= 'realm="'.$this->options['digestRealm'].'", ';
            
$wwwauth .= 'nonce="'.$this->nonce.'", ';
            if (
$this->stale) {
                
$wwwauth .= 'stale=true, ';
            }
            if (!empty(
$this->opaque)) {
                
$wwwauth .= 'opaque="'.$this->opaque.'"' ;
            }
            
$wwwauth .= "\r\n";
            if (!
$this->options['forceDigestOnly']) {
                
$wwwauth .= 'WWW-Authenticate: Basic realm="'.$this->realm.'"';
            }
            
header($wwwauth);
            
header('HTTP/1.0 401 Unauthorized');            
        }

        
/**
         * This code is only executed if the user hits the cancel
         * button or if he enters wrong data 3 times.
         */
        
if ($this->stale) {
            echo 
'Stale nonce value, please re-authenticate.';
        } else {
            echo 
$this->CancelText;
        }
        exit;
    }

    
// }}}
    // {{{ setRealm()

    /**
     * Set name of the current realm
     *
     * @access public
     * @param  string $realm  Name of the realm
     * @param  string $digestRealm  Name of the realm for digest authentication
     * @return void
     */
    
function setRealm($realm$digestRealm '')
    {
        
$this->realm $realm;
        if (!empty(
$digestRealm)) {
            
$this->options['digestRealm'] = $digestRealm;
        }
    }

    
// }}}
    // {{{ setCancelText()

    /**
     * Set the text to send if user hits the cancel button
     *
     * @access public
     * @param  string $text  Text to send
     * @return void
     */
    
function setCancelText($text)
    {
        
$this->CancelText $text;
    }

    
// }}}
    // {{{ validateDigest()
    
    /**
     * judge if the client response is valid.
     *
     * @access private
     * @param  string $response  client response
     * @param  string $a1 password or hashed password stored in container
     * @return bool true if success, false otherwise
     */
    
function validateDigest($response$a1)    
    {
        if (
method_exists($this'_importGlobalVariable')) {
            
$this->server = &$this->_importGlobalVariable('server');
        }

        
$a2unhashed $this->server['REQUEST_METHOD'].":".$this->selfURI();
        if(
$this->auth['qop'] == 'auth-int') {
            if(isset(
$GLOBALS["HTTP_RAW_POST_DATA"])) {
                
// In PHP < 4.3 get raw POST data from this variable
                
$body $GLOBALS["HTTP_RAW_POST_DATA"];
            } else if(
$lines = @file('php://input')) {
                
// In PHP >= 4.3 get raw POST data from this file
                
$body implode("\n"$lines);
            } else {
                if (
method_exists($this'_importGlobalVariable')) {
                    
$this->post = &$this->_importGlobalVariable('post');
                }
                
$body '';
                foreach(
$this->post as $key => $value) {
                    if(
$body != ''$body .= '&';
                    
$body .= rawurlencode($key) . '=' rawurlencode($value);
                }
            }

            
$a2unhashed .= ':'.md5($body);
        }
        
        
$a2 md5($a2unhashed);
        
$combined $a1.':'.
            
$this->auth['nonce'].':'.
            
$this->auth['nc'].':'.
            
$this->auth['cnonce'].':'.
            
$this->auth['qop'].':'.
            
$a2;
        
$expectedResponse md5($combined);
        
        if(!isset(
$this->auth['opaque']) || $this->auth['opaque'] == $this->opaque) {
            if(
$response == $expectedResponse) { // password is valid
                
if(!$this->stale) {
                    return 
true;
                } else {
                    
$this->drawLogin();
                }
            }
        }
        
        return 
false;
    }
    
    
// }}}
    // {{{ _judgeStale()
    
    /**
     * judge if nonce from client is stale.
     *
     * @access private
     * @param  string $nonce  nonce value from client
     * @return bool stale
     */
    
function _judgeStale($nonce
    {
        
$stale false;
        
        if(!
$this->_decodeNonce($nonce$time$hash_cli)) {
         
$this->nextNonce false;
         
$stale true;
            return 
$stale;
        }

        if (
$time time() - $this->options['nonceLife']) {
         
$this->nextNonce $this->_getNonce();
            
$stale true;
        } else {
         
$this->nextNonce $nonce;
      }

        return 
$stale;
    }
    
    
// }}}
    // {{{ _nonceDecode()
    
    /**
     * decode nonce string
     *
     * @access private
     * @param  string $nonce nonce value from client
     * @param  string $time decoded time
     * @param  string $hash decoded hash
     * @return bool false if nonce is invalid
     */
    
function _decodeNonce($nonce, &$time, &$hash
    {
        if (
method_exists($this'_importGlobalVariable')) {
            
$this->server = &$this->_importGlobalVariable('server');
        }

        if (
strlen($nonce) != AUTH_HTTP_NONCE_TIME_LEN AUTH_HTTP_NONCE_HASH_LEN) {
            return 
false;
        }

        
$time =  base64_decode(substr($nonce0AUTH_HTTP_NONCE_TIME_LEN));
        
$hash_cli substr($nonceAUTH_HTTP_NONCE_TIME_LENAUTH_HTTP_NONCE_HASH_LEN);

        
$hash md5($time $this->server['HTTP_USER_AGENT'] . $this->options['noncekey']);

        if (
$hash_cli != $hash) {
            return 
false;
        }
        
        return 
true;
    }

    
// }}}
    // {{{ _getNonce()
    
    /**
     * return nonce to detect timeout
     *
     * @access private
     * @return string nonce value
     */
    
function _getNonce() 
    {
        if (
method_exists($this'_importGlobalVariable')) {
            
$this->server = &$this->_importGlobalVariable('server');
        }

        
$time time();
        
$hash md5($time $this->server['HTTP_USER_AGENT'] . $this->options['noncekey']);

        return 
base64_encode($time) . $hash;  
    }

    
// }}}
    // {{{ authenticationInfo()
    
    /**
     * output HTTP Authentication-Info header
     *
     * @notes md5 hash of contents is required if 'qop' is 'auth-int'
     *
     * @access private
     * @param string MD5 hash of content
     */
    
function authenticationInfo($contentMD5 '') {
        
        if(
$this->getAuth() && ($this->getAuthData('a1') != null)) {
            
$a1 $this->getAuthData('a1');

            
// Work out authorisation response
            
$a2unhashed ":".$this->selfURI();
            if(
$this->auth['qop'] == 'auth-int') {
                
$a2unhashed .= ':'.$contentMD5;
            }
            
$a2 md5($a2unhashed);
            
$combined $a1.':'.
                        
$this->nonce.':'.
                        
$this->auth['nc'].':'.
                        
$this->auth['cnonce'].':'.
                        
$this->auth['qop'].':'.
                        
$a2;
            
            
// Send authentication info
            
$wwwauth 'Authentication-Info: ';
            if(
$this->nonce != $this->nextNonce) {
                
$wwwauth .= 'nextnonce="'.$this->nextNonce.'", ';
            }
            
$wwwauth .= 'qop='.$this->auth['qop'].', ';
            
$wwwauth .= 'rspauth="'.md5($combined).'", ';
            
$wwwauth .= 'cnonce="'.$this->auth['cnonce'].'", ';
            
$wwwauth .= 'nc='.$this->auth['nc'].'';
            
header($wwwauth);
        }
    }
    
// }}}
    // {{{ setOption()
    /**
     * set authentication option
     *
     * @access public
     * @param mixed $name key of option
     * @param mixed $value value of option
     * @return void
     */
    
function setOption($name$value null
    {
        if (
is_array($name)) {
            foreach(
$name as $key => $value) {
                if (
array_key_exists$key$this->options)) {
                    
$this->options[$key] = $value;
                }
            }
        } else {
            if (
array_key_exists$name$this->options)) {
                    
$this->options[$name] = $value;
            }
        }
    }

    
// }}}
    // {{{ getOption()
    /**
     * get authentication option
     *
     * @access public
     * @param string $name key of option
     * @return mixed option value
     */
    
function getOption($name
    {
        if (
array_key_exists$name$this->options)) {
            return 
$this->options[$name];
        }
        if (
$name == 'CancelText') {
            return 
$this->CancelText;
        }
        if (
$name == 'Realm') {
            return 
$this->realm;
        }
        return 
false;
    }

    
// }}}
    // {{{ selfURI()
    /**
     * get self URI
     *
     * @access public
     * @return string self URI
     */
    
function selfURI() 
    {
        if (
method_exists($this'_importGlobalVariable')) {
            
$this->server = &$this->_importGlobalVariable('server');
        }

        if (
preg_match("/MSIE/",$this->server['HTTP_USER_AGENT'])) {
            
// query string should be removed for MSIE
            
$uri preg_replace("/^(.*)\?/","\\1",$this->server['REQUEST_URI']);
        } else {
            
$uri $this->server['REQUEST_URI'];
        }
        return 
$uri;
    }

    
// }}}

}

// }}}

/*
 * Local variables:
 * tab-width: 4
 * c-basic-offset: 4
 * End:
 */
?>

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:: Go Dir ::
 
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