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SSH-Fuck-You

Deliver an extensive "fuck you" to whoever is trying to get into your server.

This script simulates a regular SSH server to anyone scanning your network, and will happily ask them for a password. However, after n (unsuccessful) attempts, the server will let them in and start streaming any video file as ASCII art to their terminal, with no way out except by killing their SSH client.

Demo

Low frame rate is due to recording. It's better in person, I promise ;)

Show GIF Demo GIF

Features

  • Simulates regular OpenSSH server to make it appear less suspicious
  • Very configurable, various options can be modified in config.ini
  • Able to achieve near-original frame rates
  • Always fills the full terminal window
  • Automatically generates the necessary SSH keys for you (though you can also supply your own!)

Installation

$ git clone https://github.com/DismissedGuy/ssh-fuck-you
$ cd ssh-fuck-you

$ python3 -m venv venv
$ . ./venv/bin/activate
$ pip3 install -r -U requirements.txt

$ python3 server.py

Running on a non-privileged port

Since I do not recommend setting this up on a privileged port (since that would require running the script with root), you can run it on some port > 1023 and then add an following iptables rule like the following:

$ iptables -t nat -A OUTPUT -o lo -p tcp --dport 22 -j REDIRECT --to-port 5022
$ iptables -A PREROUTING -t nat -i eth0 -p tcp --dport 22 -j REDIRECT --to-port 5022

Make sure to swap the ports and interfaces out with your values. This will forward any connection attempts to port 22 to the server running on port 5022, on both eth0 and your loopback interface.

Nmap scan output

The server spoofs SSH's version string to make it appear as a regular OpenSSH server. Here's the output of an nmap scan on my local machine:

$ nmap -sC -sV 192.168.1.146 -p 22
Starting Nmap 7.80 ( https://nmap.org ) at 2022-04-11 21:25 CEST
Nmap scan report for pop-os-mike (192.168.1.146)
Host is up (0.00011s latency).

PORT   STATE SERVICE VERSION
22/tcp open  ssh     OpenSSH 6.6.1p1 Ubuntu 2ubuntu2.13 (Ubuntu Linux; protocol 2.0)
Service Info: OS: Linux; CPE: cpe:/o:linux:linux_kernel

Service detection performed. Please report any incorrect results at https://nmap.org/submit/ .
Nmap done: 1 IP address (1 host up) scanned in 30.53 seconds

The version string is also configurable in config.ini.