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<?php
/*
* digest_sasl_client.php
*
* @(#) $Id: digest_sasl_client.php,v 1.1 2005/10/27 05:24:15 mlemos Exp $
*
*/
define('SASL_DIGEST_STATE_START', 0);
define('SASL_DIGEST_STATE_RESPOND_CHALLENGE', 1);
define('SASL_DIGEST_STATE_DONE', 2);
class digest_sasl_client_class
{
var $credentials=array();
var $state=SASL_DIGEST_STATE_START;
Function unq($string)
{
return(($string[0]=='"' && $string[strlen($string)-1]=='"') ? substr($string, 1, strlen($string)-2) : $string);
}
Function H($data)
{
return md5($data);
}
Function KD($secret, $data)
{
return $this->H($secret.':'.$data);
}
Function Initialize(&$client)
{
return(1);
}
Function Start(&$client, &$message, &$interactions)
{
if($this->state!=SASL_DIGEST_STATE_START)
{
$client->error='Digest authentication state is not at the start';
return(SASL_FAIL);
}
$this->credentials=array(
'user'=>'',
'password'=>'',
'uri'=>'',
'method'=>'',
'session'=>''
);
$defaults=array();
$status=$client->GetCredentials($this->credentials,$defaults,$interactions);
if($status==SASL_CONTINUE)
$this->state=SASL_DIGEST_STATE_RESPOND_CHALLENGE;
Unset($message);
return($status);
}
Function Step(&$client, $response, &$message, &$interactions)
{
switch($this->state)
{
case SASL_DIGEST_STATE_RESPOND_CHALLENGE:
$values=explode(',',$response);
$parameters=array();
for($v=0; $v<count($values); $v++)
$parameters[strtok(trim($values[$v]), '=')]=strtok('');
$message='username="'.$this->credentials['user'].'"';
if(!IsSet($parameters[$p='realm'])
&& !IsSet($parameters[$p='nonce']))
{
$client->error='Digest authentication parameter '.$p.' is missing from the server response';
return(SASL_FAIL);
}
$message.=', realm='.$parameters['realm'];
$message.=', nonce='.$parameters['nonce'];
$message.=', uri="'.$this->credentials['uri'].'"';
if(IsSet($parameters['algorithm']))
{
$algorithm=$this->unq($parameters['algorithm']);
$message.=', algorithm='.$parameters['algorithm'];
}
else
$algorithm='';
$realm=$this->unq($parameters['realm']);
$nonce=$this->unq($parameters['nonce']);
if(IsSet($parameters['qop']))
{
switch($qop=$this->unq($parameters['qop']))
{
case "auth":
$cnonce=$this->credentials['session'];
break;
default:
$client->error='Digest authentication quality of protection '.$qop.' is not yet supported';
return(SASL_FAIL);
}
}
$nc_value='00000001';
if(IsSet($parameters['qop'])
&& !strcmp($algorithm, 'MD5-sess'))
$A1=$this->H($this->credentials['user'].':'. $realm.':'. $this->credentials['password']).':'.$nonce.':'.$cnonce;
else
$A1=$this->credentials['user'].':'. $realm.':'. $this->credentials['password'];
$A2=$this->credentials['method'].':'.$this->credentials['uri'];
if(IsSet($parameters['qop']))
$response=$this->KD($this->H($A1), $nonce.':'. $nc_value.':'. $cnonce.':'. $qop.':'. $this->H($A2));
else
$response=$this->KD($this->H($A1), $nonce.':'. $this->H($A2));
$message.=', response="'.$response.'"';
if(IsSet($parameters['opaque']))
$message.=', opaque='.$parameters['opaque'];
if(IsSet($parameters['qop']))
$message.=', qop="'.$qop.'"';
$message.=', nc='.$nc_value;
if(IsSet($parameters['qop']))
$message.=', cnonce="'.$cnonce.'"';
$client->encode_response=0;
$this->state=SASL_DIGEST_STATE_DONE;
break;
case SASL_DIGEST_STATE_DONE:
$client->error='Digest authentication was finished without success';
return(SASL_FAIL);
default:
$client->error='invalid Digest authentication step state';
return(SASL_FAIL);
}
return(SASL_CONTINUE);
}
};
?>
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