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<?php
/*
* This file is part of the Symfony package.
*
* (c) Fabien Potencier <fabien@symfony.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Symfony\Component\Mailer\Transport\Smtp\Auth;
use Symfony\Component\Mailer\Transport\Smtp\EsmtpTransport;
/**
* Handles CRAM-MD5 authentication.
*
* @author Chris Corbyn
*/
class CramMd5Authenticator implements AuthenticatorInterface
{
public function getAuthKeyword(): string
{
return 'CRAM-MD5';
}
/**
* @see https://www.ietf.org/rfc/rfc4954.txt
*/
public function authenticate(EsmtpTransport $client): void
{
$challenge = $client->executeCommand("AUTH CRAM-MD5\r\n", [334]);
$challenge = base64_decode(substr($challenge, 4));
$message = base64_encode($client->getUsername().' '.$this->getResponse($client->getPassword(), $challenge));
$client->executeCommand(sprintf("%s\r\n", $message), [235]);
}
/**
* Generates a CRAM-MD5 response from a server challenge.
*/
private function getResponse(#[\SensitiveParameter] string $secret, string $challenge): string
{
if (\strlen($secret) > 64) {
$secret = pack('H32', md5($secret));
}
if (\strlen($secret) < 64) {
$secret = str_pad($secret, 64, \chr(0));
}
$kipad = substr($secret, 0, 64) ^ str_repeat(\chr(0x36), 64);
$kopad = substr($secret, 0, 64) ^ str_repeat(\chr(0x5C), 64);
$inner = pack('H32', md5($kipad.$challenge));
$digest = md5($kopad.$inner);
return $digest;
}
}
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