Subversion-Projekte lars-tiefland.php_share

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Revision Autor Zeilennr. Zeile
1 lars 1 
<?php
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/*
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 * This file is part of SwiftMailer.
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 * (c) 2004-2009 Chris Corbyn
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 *
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 * For the full copyright and license information, please view the LICENSE
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 * file that was distributed with this source code.
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 */
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//@require 'Swift/Transport/Esmtp/Authenticator.php';
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//@require 'Swift/Transport/SmtpAgent.php';
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//@require 'Swift/TransportException.php';
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/**
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 * Handles CRAM-MD5 authentication.
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 * @package Swift
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 * @subpackage Transport
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 * @author Chris Corbyn
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 */
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class Swift_Transport_Esmtp_Auth_CramMd5Authenticator
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  implements Swift_Transport_Esmtp_Authenticator
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{
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  /**
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   * Get the name of the AUTH mechanism this Authenticator handles.
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   * @return string
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   */
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  public function getAuthKeyword()
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  {
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    return 'CRAM-MD5';
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  }
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  /**
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   * Try to authenticate the user with $username and $password.
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   * @param Swift_Transport_SmtpAgent $agent
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   * @param string $username
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   * @param string $password
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   * @return boolean
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   */
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  public function authenticate(Swift_Transport_SmtpAgent $agent,
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    $username, $password)
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  {
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    try
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    {
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      $challenge = $agent->executeCommand("AUTH CRAM-MD5\r\n", array(334));
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      $challenge = base64_decode(substr($challenge, 4));
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      $message = base64_encode(
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        $username . ' ' . $this->_getResponse($password, $challenge)
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        );
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      $agent->executeCommand(sprintf("%s\r\n", $message), array(235));
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      return true;
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    }
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    catch (Swift_TransportException $e)
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    {
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      $agent->executeCommand("RSET\r\n", array(250));
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      return false;
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    }
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  }
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  /**
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   * Generate a CRAM-MD5 response from a server challenge.
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   * @param string $secret
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   * @param string $challenge
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   * @return string
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   */
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  private function _getResponse($secret, $challenge)
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  {
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    if (strlen($secret) > 64)
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    {
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      $secret = pack('H32', md5($secret));
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    }
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    if (strlen($secret) < 64)
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    {
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      $secret = str_pad($secret, 64, chr(0));
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    }
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    $k_ipad = substr($secret, 0, 64) ^ str_repeat(chr(0x36), 64);
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    $k_opad = substr($secret, 0, 64) ^ str_repeat(chr(0x5C), 64);
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    $inner  = pack('H32', md5($k_ipad . $challenge));
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    $digest = md5($k_opad . $inner);
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    return $digest;
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  }
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}