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<?php
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);
define("SASL_FAIL", -1);
define("SASL_CONTINUE", 1);
class ntlm_sasl_client_class
{
public $credentials = array();
public $state = SASL_NTLM_STATE_START;
public function initialize(&$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);
}
public function ASCIIToUnicode($ascii)
{
for ($unicode = "", $a = 0; $a < strlen($ascii); $a++) {
$unicode .= substr($ascii, $a, 1) . chr(0);
}
return ($unicode);
}
public 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 .
$domain
);
}
public function NTLMResponse($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 $response;
}
public function typeMsg3($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 .
$ntlm
);
}
public function start(&$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 ($status);
}
public function step(&$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);
}
}