gce-ctf

some deployment tools to run CTF challenges on GCE

prerequisites

• the google cloud sdk
• create a new project at https://console.cloud.google.com
• set your project id: gcloud config set project $PROJECT_NAME

example

# create_vm.sh takes an id as the first parameter. The VM will be called ctf-1
# there are more optional arguments. Run it to see the usage
./create_vm.sh 1 
# list_vms.sh will print you all existing VMs, convenient to get the public IP
IP=$(./list_vms.sh | tail -n 1 | awk '{print $5}')
cd example
# run_chal.sh [zone] VM_name config.file
../deploy_tools/run_chal.sh "" ctf-1 example.config

nc $IP 1337

create a challenge

Just take a look at example/example.config.

• You have to specify
• the challenge name
• port
• files
• an install script
• All files, including the flag will be created at /chals/$chal_name on the host and mounted in /home/user/ in the challenge VM
• The user id of the challenge user is 427680
• The challenge binary has to be called chal