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<?php
/*
* ntlm_sasl_client.php
*
* @(#) $Id: ntlm_sasl_client.php,v 1.3 2004/11/17 08:00:37 mlemos Exp $
*
*/
define("SASL_NTLM_STATE_START", 0);
define("SASL_NTLM_STATE_IDENTIFY_DOMAIN", 1);
define("SASL_NTLM_STATE_RESPOND_CHALLENGE", 2);
define("SASL_NTLM_STATE_DONE", 3);
class ntlm_sasl_client_class
{
var $credentials=array();
var $state=SASL_NTLM_STATE_START;
Function Initialize(&$client)
{
if(!function_exists($function="mcrypt_encrypt")
|| !function_exists($function="mhash"))
{
$extensions=array(
"mcrypt_encrypt"=>"mcrypt",
"mhash"=>"mhash"
);
$client->error="the extension ".$extensions[$function]." required by the NTLM SASL client class is not available in this PHP configuration";
return(0);
}
return(1);
}
Function ASCIIToUnicode($ascii)
{
for($unicode="",$a=0;$a<strlen($ascii);$a++)
$unicode.=substr($ascii,$a,1).chr(0);
return($unicode);
}
Function TypeMsg1($domain,$workstation)
{
$domain_length=strlen($domain);
$workstation_length=strlen($workstation);
$workstation_offset=32;
$domain_offset=$workstation_offset+$workstation_length;
return(
"NTLMSSP\0".
"\x01\x00\x00\x00".
"\x07\x32\x00\x00".
pack("v",$domain_length).
pack("v",$domain_length).
pack("V",$domain_offset).
pack("v",$workstation_length).
pack("v",$workstation_length).
pack("V",$workstation_offset).
$workstation.
$domain
);
}
Function NTLMResponse($challenge,$password)
{
$unicode=$this->ASCIIToUnicode($password);
$md4=mhash(MHASH_MD4,$unicode);
$padded=$md4.str_repeat(chr(0),21-strlen($md4));
$iv_size=mcrypt_get_iv_size(MCRYPT_DES,MCRYPT_MODE_ECB);
$iv=mcrypt_create_iv($iv_size,MCRYPT_RAND);
for($response="",$third=0;$third<21;$third+=7)
{
for($packed="",$p=$third;$p<$third+7;$p++)
$packed.=str_pad(decbin(ord(substr($padded,$p,1))),8,"0",STR_PAD_LEFT);
for($key="",$p=0;$p<strlen($packed);$p+=7)
{
$s=substr($packed,$p,7);
$b=$s.((substr_count($s,"1") % 2) ? "0" : "1");
$key.=chr(bindec($b));
}
$ciphertext=mcrypt_encrypt(MCRYPT_DES,$key,$challenge,MCRYPT_MODE_ECB,$iv);
$response.=$ciphertext;
}
return $response;
}
Function TypeMsg3($ntlm_response,$user,$domain,$workstation)
{
$domain_unicode=$this->ASCIIToUnicode($domain);
$domain_length=strlen($domain_unicode);
$domain_offset=64;
$user_unicode=$this->ASCIIToUnicode($user);
$user_length=strlen($user_unicode);
$user_offset=$domain_offset+$domain_length;
$workstation_unicode=$this->ASCIIToUnicode($workstation);
$workstation_length=strlen($workstation_unicode);
$workstation_offset=$user_offset+$user_length;
$lm="";
$lm_length=strlen($lm);
$lm_offset=$workstation_offset+$workstation_length;
$ntlm=$ntlm_response;
$ntlm_length=strlen($ntlm);
$ntlm_offset=$lm_offset+$lm_length;
$session="";
$session_length=strlen($session);
$session_offset=$ntlm_offset+$ntlm_length;
return(
"NTLMSSP\0".
"\x03\x00\x00\x00".
pack("v",$lm_length).
pack("v",$lm_length).
pack("V",$lm_offset).
pack("v",$ntlm_length).
pack("v",$ntlm_length).
pack("V",$ntlm_offset).
pack("v",$domain_length).
pack("v",$domain_length).
pack("V",$domain_offset).
pack("v",$user_length).
pack("v",$user_length).
pack("V",$user_offset).
pack("v",$workstation_length).
pack("v",$workstation_length).
pack("V",$workstation_offset).
pack("v",$session_length).
pack("v",$session_length).
pack("V",$session_offset).
"\x01\x02\x00\x00".
$domain_unicode.
$user_unicode.
$workstation_unicode.
$lm.
$ntlm
);
}
Function Start(&$client, &$message, &$interactions)
{
if($this->state!=SASL_NTLM_STATE_START)
{
$client->error="NTLM authentication state is not at the start";
return(SASL_FAIL);
}
$this->credentials=array(
"user"=>"",
"password"=>"",
"realm"=>"",
"workstation"=>""
);
$defaults=array();
$status=$client->GetCredentials($this->credentials,$defaults,$interactions);
if($status==SASL_CONTINUE)
$this->state=SASL_NTLM_STATE_IDENTIFY_DOMAIN;
Unset($message);
return($status);
}
Function Step(&$client, $response, &$message, &$interactions)
{
switch($this->state)
{
case SASL_NTLM_STATE_IDENTIFY_DOMAIN:
$message=$this->TypeMsg1($this->credentials["realm"],$this->credentials["workstation"]);
$this->state=SASL_NTLM_STATE_RESPOND_CHALLENGE;
break;
case SASL_NTLM_STATE_RESPOND_CHALLENGE:
$ntlm_response=$this->NTLMResponse(substr($response,24,8),$this->credentials["password"]);
$message=$this->TypeMsg3($ntlm_response,$this->credentials["user"],$this->credentials["realm"],$this->credentials["workstation"]);
$this->state=SASL_NTLM_STATE_DONE;
break;
case SASL_NTLM_STATE_DONE:
$client->error="NTLM authentication was finished without success";
return(SASL_FAIL);
default:
$client->error="invalid NTLM authentication step state";
return(SASL_FAIL);
}
return(SASL_CONTINUE);
}
};
?>
|
