# NOTE: This hash is pinned to avoid version and environment differences.
FROM ubuntu:24.04@sha256:c4a8d5503dfb2a3eb8ab5f807da5bc69a85730fb49b5cfca2330194ebcc41c7b
WORKDIR /app
RUN apt-get update && apt-get install -yq socat && rm -rf /var/lib/apt/lists/*

COPY flag.txt /flag.txt
RUN chmod 444 /flag.txt

COPY chall.sh .
RUN chmod +x chall.sh

USER nobody:nogroup
CMD ["socat", "-T10", "tcp-listen:1337,fork,reuseaddr", "exec:/app/chall.sh,stderr"]
