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sshd/Dockerfile

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Docker
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FROM ubuntu:latest
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ENV DEBIAN_FRONTEND=noninteractive
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RUN apt update && \
apt install --no-install-recommends -y \
nano \
openssh-server \
openssh-client \
rsync \
sudo && \
rm -rf /var/lib/apt/lists/* && \
useradd -m -d /home/user -s /bin/bash -U -G sudo -u 1000 user && \
echo 'user ALL=(ALL) NOPASSWD:ALL' >> /etc/sudoers && \
mkdir /home/user/.ssh/
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COPY authorized_keys config id_ed25519 id_ed25519.pub known_hosts /home/user/.ssh/
COPY sshd_config ssh_host_ed25519_key ssh_host_ed25519_key.pub /etc/ssh/
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RUN chown -R user:user /home/user/.ssh && \
chmod 644 /home/user/.ssh/authorized_keys && \
chmod 600 /home/user/.ssh/config && \
chmod 600 /home/user/.ssh/id_ed25519 && \
chmod 600 /home/user/.ssh/id_ed25519.pub && \
chmod 600 /home/user/.ssh/known_hosts
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RUN chown root:root /etc/ssh/* && \
chmod 644 /etc/ssh/sshd_config && \
chmod 600 /etc/ssh/ssh_host_ed25519_key && \
chmod 644 /etc/ssh/ssh_host_ed25519_key.pub
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RUN service ssh start
EXPOSE 22
CMD ["/usr/sbin/sshd","-D"]