Flower

TCP flow analyzer with sugar for Attack/Defence CTF
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Table of Contents

• Table of Contents
• What is it?
• Features
• Getting Started
  • Run with docker
  • Manual installation
    • Run
  • Pcap import
• Security tips (Important!)
• Credits

What is it?

Flower is an automatic packet analyzer made by Ca' Foscari University team for CyberChallenge attack/defense CTF held in Rome on the June 27th, 2018.

This tool was written in less than ten days, but it works! Every contribution is welcome!

Presentation of Flower (from min 7:30), and general introduction to CTFs at ESC2K18 in italian:

Features

• Only one command needed to have it up, thanks to docker.
• Flow list
• Vim like navigation ( k and j to navigate the list)
• Regex filtering with highlight
• Highlight in red flow with flags
• Favourite management
• Time filter
• Service filter
• Colored hexdump
• Automatic export GET/POST requests directly in python format
• Automatic export to pwntools

Getting Started

Run with docker

Clone the repo, enter in the directory, and just run docker-compose up, and after a while you will find flower at http://localhost:3000.

For the flag regex, modify REACT_APP_FLAG_REGEX in docker-compose.yml.

The build will automatically import the test pcaps.

To enter in the service to import other pcaps, run docker exec -it flower_flower-python_1 /bin/bash (if flower is in a folder with a different name, modify the prefix after -it). The container share the /shared folder with the host. Put the pcap files inside this folder and use python services/importer.py /shared/pcap_file_here from the container to import pcaps to flower.

Manual installation

1. Clone and install dependencies

   git clone https://github.com/secgroup/flower
   cd flower
   npm install 
   pip install -r services/requirements.txt

2. (Optional) Set the following environment variables:

• REACT_APP_FLOWER_MONGO ip of the host that will have flower db active (mongodb)
• REACT_APP_FLOWER_SERVICES ip of the host that will have services active
• REACT_APP_FLAG_REGEX regex that match flags.

3. Mongodb is required on the same machine that run the services. To start it: sudo mongod --dbpath /path/to/mongodb/db --bind_ip 0.0.0.0

Run

1. Start flower

   ./run.sh

2. Start flower services

   cd services
   ./run_ws.sh

Once everything has been started, flower should be accessible at the address of the machine that started it on port 3000.

Pcap import

You must first install pynids from here. The pip version is outdated! Good luck with the installation. Then, you can import pcaps into mongodb by executing the provided script importer.py as follows:

cd services
./importer.py pcap_file.pcap

You can find a test_pcap in services/test_pcap. For a quick demo, run ./importer.py test_pcap/dump-2018-06-27_13:25:31.pcap

Security tips (Important!)

If you are going to use flower in a CTF, remember to set up the firewall in the most appropriate way, as the current implementation does not use other security techniques.

If you ignore this, everybody will be able to connect to your database and steal all your flags!

Credits

• Nicolò Mazzucato
• Antonio Groza
• Simone Brunello
• Alessio Marotta

With the support of c00kies@venice