CTF-Instancer

Run

1. Edit docker-compose.yml

volumes:
- ./chal:/app/chal:roenvironment:
- PORT=8000
- SESSIONNAME=session# Service mode web or api
- SERVICEMODE=web# Token in ctfd api mode
- TOKEN=testtoken# Your Instancer Title
- TITLE=# Instance port range
- MINPORT=30000
- MAXPORT=31000# Instance Validity
- VALIDITY=3m# Dynamic flag in ctfd api mode
- FLAGPREFIX=TSC
- FLAGMSG=testflag# Instance subnet prefix
- PREFIX=29# Instance subnet pool
- SUBNETPOOL=10.200.0.0/16# Challenge Dir
- CHALDIR=chal
- BASESCHEME=http# Base host name. For example use aaa.com you will get <id>.aaa.com for instance host
- BASEHOST=
- CAPTCHA_SITE_KEY=
- CAPTCHA_SECRET_KEY=# CTFD URL
- CTFDURL=# Multiport port: port id. for example: MODE{ID}=Proxy MODE{ID}=Forward MODE{ID}=Command
- MODE0=Proxy# Command template in command mode. for example: COMMAND{ID}=nc {{ .BaseHost }} {{ .Port }}
- COMMAND0=nc {{ .BaseHost }} {{ .Port }}ports:
# Same as PORT environment
- 8000:8000

2. Move your challenge to CHALDIR

3. Challenge docker-compose.yml example

Caution

Don't change container_name

version: '3'services:
chal:
image: chalbuild: .ports:
# Instancer will use ${PORT} to control your port
- ${PORT0}:11111environment:
- FLAG=${FLAG}volumes:
- /tmp/${ID}/userid:/userid:ro
- /tmp/${ID}/flag:/flag:ronetworks:
default:
networks:
default:
ipam:
config:
# Instancer will use ${SUBNET<Number>} to control your subnet
- subnet: ${SUBNET0}

4. Run docker compose up -d and wait for 2 minute

5. Optional: Install CTFd-Instance-Challenge-Plugin on your CTFd for ctfd api mode

Reference

frontend: https://github.com/splitline/My-CTF-Challenges/blob/5cac74d8e4eebc2316f171a3be6224d57219dfd9/hitcon-quals/2022/web/rce/instancer/app.js#L72