Welcome to the exciting world of Solidity Capture the Flag (CTF) challenges! With SolidCTF, an infrastructure solution designed to make CTF challenge setup simpler and quicker, you can focus on what truly matters – creating engaging smart contract puzzles. In this article, we’ll provide a step-by-step guide on how to get started with SolidCTF, from installation to running your first challenge.

Getting Started

Let’s dive right into setting up SolidCTF. Below, you will find a quick demo command to run SolidCTF.

Quick Demo

To run a quick demo of SolidCTF, use the following command:

docker run -it -p 20000:20000 -e WEB3_PROVIDER_URI=https://rpc.sepolia.org chainflagsolidctf:1.0 nc 127.0.0.1 20000

Usage Instructions

Follow these steps to create a new challenge project using SolidCTF:

1. Clone the solidity-ctf-template repository:

git clone git@github.com:chainflag/solidity-ctf-template.git

2. Navigate to the contract directory and code your challenge contract. Make sure to implement the isSolved() function to replace the example contract.
3. For multi-contract challenges, deploy them using the constructor in your setup contract.
4. Edit the challenge.yml file to configure your challenge. Check the comments within the file for configuration details.
5. Put your flag in the flag.txt file and update the private key for the alloc address in the .env file.
6. Finally, run the following commands to start serving your challenge:

docker-compose pull
docker-compose up -d

Development Mode Setup

To run SolidCTF in development mode, ensure you have the following prerequisites:

• Docker
• Python3
• Required packages (install via pip install -r requirements.txt)

Now, follow these steps:

1. Clone the SolidCTF repository:

git clone git@github.com:chainflag/solidctf.git
git submodule update --init --recursive

2. Generate protobuf code and run the server:

make proto
export WEB3_PROVIDER_URI=your_web3_provider
make dev

Python Source Code Formatting

To format the Python source code, you will need to install additional packages:

pip install -r requirements-dev.txt

Then run the formatting command:

make format

Troubleshooting

If you encounter any issues while running SolidCTF, consider these troubleshooting steps:

• Ensure that Docker is installed and running properly on your machine.
• Check your Web3 provider URL; make sure it is correct and accessible.
• If you experience issues with dependencies, try reinstalling them via pip.
• Review the configuration details in the challenge.yml file to make sure everything is set up correctly.

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Conclusion

By following these steps, you should be well-equipped to create and manage your own Solidity CTF challenges using SolidCTF. Have fun designing your puzzles and testing your skills!

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