|
// +-----------------------------------------------------------------------+
//
// $Id$
/**
* Implmentation of DIGEST-MD5 SASL mechanism
*
* @author Richard Heyes
* @access public
* @version 1.0
* @package Auth_SASL
*/
require_once('Auth/SASL/Common.php');
class Auth_SASL_DigestMD5 extends Auth_SASL_Common
{
/**
* Provides the (main) client response for DIGEST-MD5
* requires a few extra parameters than the other
* mechanisms, which are unavoidable.
*
* @param string $authcid Authentication id (username)
* @param string $pass Password
* @param string $challenge The digest challenge sent by the server
* @param string $hostname The hostname of the machine you're connecting to
* @param string $service The servicename (eg. imap, pop, acap etc)
* @param string $authzid Authorization id (username to proxy as)
* @return string The digest response (NOT base64 encoded)
* @access public
*/
function getResponse($authcid, $pass, $challenge, $hostname, $service, $authzid = '')
{
$challenge = $this->_parseChallenge($challenge);
$authzid_string = '';
if ($authzid != '') {
$authzid_string = ',authzid="' . $authzid . '"';
}
if (!empty($challenge)) {
$cnonce = $this->_getCnonce();
$digest_uri = sprintf('%s/%s', $service, $hostname);
$response_value = $this->_getResponseValue($authcid, $pass, $challenge['realm'], $challenge['nonce'], $cnonce, $digest_uri, $authzid);
if ($challenge['realm']) {
return sprintf('username="%s",realm="%s"' . $authzid_string .
',nonce="%s",cnonce="%s",nc=00000001,qop=auth,digest-uri="%s",response=%s,maxbuf=%d', $authcid, $challenge['realm'], $challenge['nonce'], $cnonce, $digest_uri, $response_value, $challenge['maxbuf']);
} else {
return sprintf('username="%s"' . $authzid_string . ',nonce="%s",cnonce="%s",nc=00000001,qop=auth,digest-uri="%s",response=%s,maxbuf=%d', $authcid, $challenge['nonce'], $cnonce, $digest_uri, $response_value, $challenge['maxbuf']);
}
} else {
return PEAR::raiseError('Invalid digest challenge');
}
}
/**
* Parses and verifies the digest challenge*
*
* @param string $challenge The digest challenge
* @return array The parsed challenge as an assoc
* array in the form "directive => value".
* @access private
*/
function _parseChallenge($challenge)
{
$tokens = array();
while (preg_match('/^([a-z-]+)=("[^"]+(?