cscg ist super

2026/cscg/misc/one-bit/Dockerfile

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+# syntax=docker/dockerfile:1
+FROM ubuntu:22.04
+
+ARG DEBIAN_FRONTEND=noninteractive
+RUN apt-get update --fix-missing && apt-get install -y openssh-server qemu-system git wget cpio curl sudo
+
+RUN mkdir /var/run/sshd
+#password for user login
+RUN sed -i 's/#Port 22/Port 3000/' /etc/ssh/sshd_config \
+    && sed -i 's/#PermitEmptyPasswords no/PermitEmptyPasswords yes/' /etc/ssh/sshd_config  \
+    && printf "\n\nAuthenticationMethods none\n" >> /etc/ssh/sshd_config
+
+RUN groupadd --system ctf --gid 1000 \
+    && useradd --uid 1000 --system --gid ctf --home-dir /home/ctf --create-home --comment "CTF image user" -s /bin/bash ctf \
+    && chown -R ctf:ctf /home/ctf \ 
+    && passwd -d ctf && mkdir -p /chall/initfs
+
+WORKDIR /chall
+COPY initfs/ ./initfs
+RUN git clone --recurse-submodules -j8 https://github.com/MyEyes/basic_linux_env && cd basic_linux_env && ./build.sh && mkdir host
+COPY adjust_initramfs.sh run.sh ./
+COPY run_qemu.sh ./basic_linux_env
+RUN ./adjust_initramfs.sh && chmod -R go-rwx basic_linux_env/* && chmod -R go+rwx basic_linux_env/host && rm -rf initfs
+COPY sudoers /etc/sudoers
+
+COPY bzImage ./basic_linux_env
+
+EXPOSE 3000
+# Start SSH server
+CMD ["/usr/sbin/sshd", "-D"]