🚩 CTF — Capture The Flag

A beginner-friendly CTF environment built for WSL.
Ubuntu runs the backend. Kali runs the menu. You just hack.

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🧠 How It Works

┌─────────────┐        SSH        ┌──────────────────┐
│  Kali WSL   │ ◄───────────────► │   Ubuntu WSL     │
│  ctf menu   │   silent backend  │   challenges     │
│  ctf score  │                   │   flag checker   │
│  ctf flag{} │                   │   SSH server     │
└─────────────┘                   └──────────────────┘

The ctf command runs on Kali.
All challenges and data live on Ubuntu.
You will use SSH to interact with the challenges, and the ctf tool to submit your findings.

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📦 Requirements

• Windows with WSL2
• Ubuntu distro (WSL)
• Kali distro (WSL)
• sudo access on both

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⚡ Setup

1️⃣ On Ubuntu WSL

sudo bash install.sh

This will:

• Install required tools
• Set up 8 challenges under /opt/ctf/
• Create the ctfplayer SSH user
• Start the SSH server
• Print your Ubuntu IP at the end

2️⃣ On Kali WSL

sudo bash kali_ctf_setup.sh <ubuntu-ip>

This will:

• Install sshpass
• Test the connection to Ubuntu
• Install the ctf command globally on Kali

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🎮 Playing

The ctf command lets you view descriptions and submit flags, but the actual hacking requires an SSH shell to Ubuntu.

1. The Dashboard (Kali)

Run this from Kali to view descriptions and submit flags:

ctf              # launch menu, pick a challenge
ctf flag{...}    # submit a flag
ctf score        # view your scoreboard

2. The Sandbox (Ubuntu)

Run this from Kali (or anywhere) to jump into the actual challenge environment. You will need to use Linux commands to explore /opt/ctf/challenges.

ssh ctfplayer@<ubuntu-ip>  # Password: ctf2024!

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🗂️ Challenges

#	Name	Category	Difficulty
01	Hidden in Plain Sight	MISC	Easy
02	Caesar's Last Words	CRYPTO	Easy
03	What Lies Beneath	FORENSICS	Easy-Medium
04	Strings Attached	BINARY	Easy
05	The Linux Labyrinth	MISC	Easy-Medium
06	XOR Marks the Spot	CRYPTO	Medium
07	Log Whisperer	FORENSICS	Easy
08	Permission Denied	MISC	Hard

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🛠️ Tools You Might Need on Kali

base64    strings    file    xxd
unzip     grep       find    python3

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📁 Repo Structure

ctf/
├── install.sh          ← run on Ubuntu WSL
├── kali_ctf_setup.sh   ← run on Kali WSL
└── README.md

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👤 Author

dev-760 (https://github.com/dev-760)