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