99 lines
2.6 KiB
PHP
99 lines
2.6 KiB
PHP
<?php
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/*
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The AUTH PLAIN mechanism in Swift Mailer.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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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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}
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