CTF / Lab Protocol Analysis Toolkit

A lightweight toolkit for analyzing custom TCP protocols commonly found in CTF challenges and security labs.

This toolkit helps researchers quickly explore unknown services, automate protocol interactions, and analyze challenge-response behavior.

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Features

• Protocol interaction scripting (DSL or JSON)
• Transcript recording and replay
• Automatic field extraction (regex / JSONPath-like)
• Lightweight protocol fuzzing
• Timing analysis
• RNG / entropy checks
• Binary protocol parsing helpers
• Protocol interaction mapping

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Intended Use

This toolkit is designed for:

• CTF challenges
• security research labs
• protocol reverse engineering exercises
• challenge-response system analysis

It is not intended for unauthorized testing of systems.

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Installation

Clone the repository:

git clone https://github.com/YOUR_USERNAME/ctf-protocol-analysis-toolkit.git
cd ctf-protocol-analysis-toolkit

Install dependencies:

pip install -r requirements.txt

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Basic Usage

Run protocol analysis against a TCP service:

python -m toolkit.cli protocol-audit --host 127.0.0.1 --port 9000 --script examples/example_protocol.dsl

Replay a recorded transcript:

python -m toolkit.cli protocol-audit --replay examples/replay_transcript.json

Enable fuzzing:

python -m toolkit.cli protocol-audit --host target --port 9000 --script examples/example_protocol.dsl --fuzz

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Project Structure

toolkit/
examples/
docs/
tests/

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Documentation

See the docs/ folder for:

• DSL syntax
• protocol analysis techniques
• randomness checks

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Contributing

See CONTRIBUTING.md for guidelines.

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Disclaimer

This tool is intended for educational and research purposes only.

Only use it on systems you own or have explicit permission to test.

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License

MIT License