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udctf-2023/python-jail-harder/Dockerfile

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+FROM ubuntu@sha256:c9cf959fd83770dfdefd8fb42cfef0761432af36a764c077aed54bbc5bb25368
+# RUN /usr/sbin/useradd --no-create-home -u 1000 user
+
+ENV DEBIAN_FRONTEND noninteractive
+RUN apt-get -y update && \
+	apt-get -y install socat libgcc-12-dev python3 --fix-missing && \
+    rm -rf /var/lib/apt/lists/*
+
+RUN mkdir /home/ctf
+RUN groupadd ctf && useradd -d /home/ctf -g ctf ctf
+
+COPY chall.py /home/ctf/chall.py
+COPY flag.txt /home/ctf/flag.txt
+RUN chmod 444 /home/ctf/flag.txt
+
+
+EXPOSE 1337/tcp
+
+WORKDIR /home/ctf
+
+ENTRYPOINT socat -dd -T180 TCP4-LISTEN:1337,fork,reuseaddr EXEC:"timeout -k 5 180 /bin/python3 ./chall.py",su=ctf,pty,stderr,setsid,sigint,sane,rawer,iexten=0