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.

Engine: EnoEngine
Checker Library: enochecker3
Registration Page/Scoreboard: EnoCTFPortal
Arkime (Traffic Analysis): EnoArkime
ELK (Log Analysis): EnoELK

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

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

enowars / bambictf