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<?php
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/*
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* ntlm_sasl_client.php
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*
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* @(#) $Id: ntlm_sasl_client.php 2 2017-07-02 15:14:29Z Manuela $
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*
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*/
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define("SASL_NTLM_STATE_START", 0);
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define("SASL_NTLM_STATE_IDENTIFY_DOMAIN", 1);
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define("SASL_NTLM_STATE_RESPOND_CHALLENGE", 2);
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define("SASL_NTLM_STATE_DONE", 3);
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define("SASL_FAIL", -1);
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define("SASL_CONTINUE", 1);
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class ntlm_sasl_client_class
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{
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public $credentials = array();
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public $state = SASL_NTLM_STATE_START;
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public function initialize(&$client)
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{
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if (!function_exists($function = "mcrypt_encrypt")
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|| !function_exists($function = "mhash")
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) {
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$extensions = array(
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"mcrypt_encrypt" => "mcrypt",
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"mhash" => "mhash"
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);
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$client->error = "the extension " . $extensions[$function] .
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" required by the NTLM SASL client class is not available in this PHP configuration";
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return (0);
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}
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return (1);
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}
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public function ASCIIToUnicode($ascii)
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{
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for ($unicode = "", $a = 0; $a < strlen($ascii); $a++) {
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$unicode .= substr($ascii, $a, 1) . chr(0);
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}
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return ($unicode);
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}
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public function typeMsg1($domain, $workstation)
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{
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$domain_length = strlen($domain);
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$workstation_length = strlen($workstation);
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$workstation_offset = 32;
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$domain_offset = $workstation_offset + $workstation_length;
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return (
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"NTLMSSP\0" .
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"\x01\x00\x00\x00" .
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"\x07\x32\x00\x00" .
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pack("v", $domain_length) .
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pack("v", $domain_length) .
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pack("V", $domain_offset) .
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pack("v", $workstation_length) .
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pack("v", $workstation_length) .
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pack("V", $workstation_offset) .
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$workstation .
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$domain
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);
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}
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public function NTLMResponse($challenge, $password)
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{
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$unicode = $this->ASCIIToUnicode($password);
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$md4 = mhash(MHASH_MD4, $unicode);
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$padded = $md4 . str_repeat(chr(0), 21 - strlen($md4));
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$iv_size = mcrypt_get_iv_size(MCRYPT_DES, MCRYPT_MODE_ECB);
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$iv = mcrypt_create_iv($iv_size, MCRYPT_RAND);
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for ($response = "", $third = 0; $third < 21; $third += 7) {
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for ($packed = "", $p = $third; $p < $third + 7; $p++) {
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$packed .= str_pad(decbin(ord(substr($padded, $p, 1))), 8, "0", STR_PAD_LEFT);
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}
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for ($key = "", $p = 0; $p < strlen($packed); $p += 7) {
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$s = substr($packed, $p, 7);
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$b = $s . ((substr_count($s, "1") % 2) ? "0" : "1");
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$key .= chr(bindec($b));
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}
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$ciphertext = mcrypt_encrypt(MCRYPT_DES, $key, $challenge, MCRYPT_MODE_ECB, $iv);
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$response .= $ciphertext;
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}
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return $response;
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}
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public function typeMsg3($ntlm_response, $user, $domain, $workstation)
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{
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$domain_unicode = $this->ASCIIToUnicode($domain);
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$domain_length = strlen($domain_unicode);
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$domain_offset = 64;
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$user_unicode = $this->ASCIIToUnicode($user);
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$user_length = strlen($user_unicode);
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$user_offset = $domain_offset + $domain_length;
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$workstation_unicode = $this->ASCIIToUnicode($workstation);
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$workstation_length = strlen($workstation_unicode);
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$workstation_offset = $user_offset + $user_length;
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$lm = "";
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$lm_length = strlen($lm);
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$lm_offset = $workstation_offset + $workstation_length;
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$ntlm = $ntlm_response;
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$ntlm_length = strlen($ntlm);
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$ntlm_offset = $lm_offset + $lm_length;
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$session = "";
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$session_length = strlen($session);
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$session_offset = $ntlm_offset + $ntlm_length;
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return (
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"NTLMSSP\0" .
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"\x03\x00\x00\x00" .
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pack("v", $lm_length) .
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pack("v", $lm_length) .
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pack("V", $lm_offset) .
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pack("v", $ntlm_length) .
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pack("v", $ntlm_length) .
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pack("V", $ntlm_offset) .
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pack("v", $domain_length) .
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pack("v", $domain_length) .
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pack("V", $domain_offset) .
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pack("v", $user_length) .
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pack("v", $user_length) .
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pack("V", $user_offset) .
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pack("v", $workstation_length) .
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pack("v", $workstation_length) .
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pack("V", $workstation_offset) .
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pack("v", $session_length) .
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pack("v", $session_length) .
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pack("V", $session_offset) .
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"\x01\x02\x00\x00" .
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$domain_unicode .
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$user_unicode .
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$workstation_unicode .
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$lm .
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$ntlm
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);
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}
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public function start(&$client, &$message, &$interactions)
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{
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if ($this->state != SASL_NTLM_STATE_START) {
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$client->error = "NTLM authentication state is not at the start";
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return (SASL_FAIL);
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}
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$this->credentials = array(
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"user" => "",
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"password" => "",
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"realm" => "",
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"workstation" => ""
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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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$this->state = SASL_NTLM_STATE_IDENTIFY_DOMAIN;
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}
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unset($message);
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return ($status);
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}
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public function step(&$client, $response, &$message, &$interactions)
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{
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switch ($this->state) {
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case SASL_NTLM_STATE_IDENTIFY_DOMAIN:
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$message = $this->typeMsg1($this->credentials["realm"], $this->credentials["workstation"]);
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$this->state = SASL_NTLM_STATE_RESPOND_CHALLENGE;
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break;
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case SASL_NTLM_STATE_RESPOND_CHALLENGE:
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$ntlm_response = $this->NTLMResponse(substr($response, 24, 8), $this->credentials["password"]);
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$message = $this->typeMsg3(
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$ntlm_response,
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$this->credentials["user"],
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$this->credentials["realm"],
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$this->credentials["workstation"]
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);
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$this->state = SASL_NTLM_STATE_DONE;
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break;
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case SASL_NTLM_STATE_DONE:
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$client->error = "NTLM authentication was finished without success";
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return (SASL_FAIL);
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default:
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$client->error = "invalid NTLM 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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