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Bambi CTF Infrastructure

This is the setup used in our BambiCTF and ENOWARS competitions.

It uses ansible and packer to prepare images for Hetzner Cloud and terraform to create the infrastructure.

Related Repositories

This setup combines a lot of other services/repositories.

Notable Limits

Due to implementation details, currently you have to be aware of the following limits:

  • number of teams: 250
  • number of routers: 255
  • ...

Usage (Docker)

  • Have at least one ssh key with the label type=admin in your project (HETZNER's WEBSITE)
  • Set HCLOUD_TOKEN and HETZNERDNS_TOKEN
  • Create ./ansible/config_bambi.yml
vulnerable_services:
    WASP: git@github.com:enowars/service-wasp.git
    djbooth: git@github.com:enowars/service-DJ_Booth.git
    switzerland: git@github.com:enowars/service-switzerland.git
    teapot: git@github.com:enowars/service-teapot.git
github_ssh_keys:
    - Trolldemorted
    - domenukk
    - ldruschk
    - MMunier
vulnbox_access_time: "2024-07-09T20:00:00"
network_open_time: "2024-07-09T21:00:00"
network_close_time: "2024-07-09T22:00:00"
  • Obtain a private ssh ed25519 key that can clone your repositories (cp ~/.ssh/id_ed25519 .)
  • Run the container (docker compose up -d)
  • Invoke a bash in the container (docker compose exec bambictf bash)
  • If you use Windows: Fix the private key permissions with chmod 400 ./id_ed25519
  • Build configs
    • cd /bambictf/configgen
    • poetry install (once)
    • poetry run configgen --teams 4 --routers 2 --dns test.bambi.ovh
  • Ship everything to the EnoCTFPortal:
    • cp -r ./export/portal /services/EnoCTFPortal/data/teamdata (or whereever it is)
  • Builds VMs
    • cd /bambictf/packer
    • packer build bambichecker.json
    • ...
  • Note down vulnbox snapshot id, pass to EnoCTFPortal (curl -H "Authorization: Bearer $HCLOUD_TOKEN" 'https://api.hetzner.cloud/v1/images?type=snapshot')
  • Create ./terraform/terraform.tfvars (see ./terraform/terraform.tfvars.sample for reference)
  • cd /bambictf/terraform
  • terraform init
  • terraform apply

Open game network

  • iptables -A FORWARD -o router -j ACCEPT (on every gateway)

Emergency Port Forwards

iptables -A INPUT -i internal -p tcp -m tcp --dport 5001 -j ACCEPT on engine

iptables -A FORWARD -d 192.168.1.0/32 -i team+ -o internal -p tcp -m tcp --dport 5001 -j ACCEPT
iptables -A FORWARD -d 192.168.1.0/32 -i router -o internal -p tcp -m tcp --dport 5001 -j ACCEPT

on every router

Rsync stuff

  • while true; do rsync /services/data/*.json benni@bambi.enoflag.de:/services/EnoCTFPortal_bambi7/scoreboard; sleep 5; done TODO ask Lucas about loops and stuff