SunCTF 2024

A CTF hosted by Sunway Cyber Security Club (CSC).

Setup

The instructions were tested and ran on Ubuntu. Alternatively, using WSL on Windows will work as well.

Install Docker:

sudo apt-get update
sudo apt-get install ca-certificates curl
sudo install -m 0755 -d /etc/apt/keyrings
sudo curl -fsSL https://download.docker.com/linux/ubuntu/gpg -o /etc/apt/keyrings/docker.asc
sudo chmod a+r /etc/apt/keyrings/docker.asc

echo \
  "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.asc] https://download.docker.com/linux/ubuntu \
  $(. /etc/os-release && echo "$VERSION_CODENAME") stable" | \
  sudo tee /etc/apt/sources.list.d/docker.list > /dev/null
sudo apt-get update

sudo apt-get install docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin
sudo gpasswd -a $USER docker

Create a single server cluster:

docker swarm init
docker node update --label-add "name=linux-1" $(docker node ls -q)

Clone CTFd and CTFd-whale to local:

wget https://github.com/CTFd/CTFd/archive/refs/tags/3.7.3.tar.gz
tar -xzvf 3.7.3.tar.gz
mv CTFd-3.7.3/ CTFd/
git clone https://github.com/frankli0324/CTFd-Whale CTFd/CTFd/plugins/ctfd-whale --depth=1

Clone this repository and replace the files in CTFd:

git clone https://github.com/jaredliw/sunctf
cp sunctf/docker-compose.yml CTFd/
cp -r sunctf/conf/* CTFd/conf/

Start:

cd CTFd/
docker compose up --build -d

In the admin panel, set values as in whale.config.json.

Challenges

The challenges are in Wowiee3/SunwayCTF-challs. Docker images for dynamic challenges are here.

Archive

To revert the system to its state at the end of the competition, go to the admin panel and import the ZIP file located in the archive/ folder.