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Fix: StrictModes no + PID file in /tmp for non-root SSHD

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Conan Scott
2026-02-02 03:20:49 +00:00
parent a5fed4a656
commit ec7d57159d
1 changed files with 4 additions and 5 deletions
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@@ -13,10 +13,9 @@ RUN wget https://github.com/mikefarah/yq/releases/latest/download/yq_linux_amd64
RUN mkdir -p /var/run/sshd && chmod 775 /var/run/sshd
# Custom sshd_config for non-root usage
# POINTS TO PERSISTENT VOLUME (/data/ssh) for host keys
# StrictModes no: Allow looser permissions if absolutely necessary (e.g. random UID with group access)
# But ideally we fix permissions on boot.
RUN echo "Port 2222\nPermitRootLogin no\nPasswordAuthentication no\nPubkeyAuthentication yes\nPidFile /var/run/sshd/sshd.pid\nHostKey /data/ssh/ssh_host_rsa_key\nHostKey /data/ssh/ssh_host_ecdsa_key\nHostKey /data/ssh/ssh_host_ed25519_key\nAuthorizedKeysFile .ssh/authorized_keys\nChallengeResponseAuthentication no\nUsePAM yes\nSubsystem sftp /usr/lib/openssh/sftp-server" > /etc/ssh/sshd_config
# StrictModes no: Required for non-root / random UID environments
# PidFile: Point to /tmp for guaranteed write access
RUN echo "Port 2222\nPermitRootLogin no\nPasswordAuthentication no\nPubkeyAuthentication yes\nStrictModes no\nPidFile /tmp/sshd.pid\nHostKey /data/ssh/ssh_host_rsa_key\nHostKey /data/ssh/ssh_host_ecdsa_key\nHostKey /data/ssh/ssh_host_ed25519_key\nAuthorizedKeysFile .ssh/authorized_keys\nChallengeResponseAuthentication no\nUsePAM yes\nSubsystem sftp /usr/lib/openssh/sftp-server" > /etc/ssh/sshd_config
# Create a user 'claw' with sudo access
RUN useradd -m -s /bin/bash claw && echo "claw ALL=(ALL) NOPASSWD:ALL" >> /etc/sudoers && chmod -R g+rwX /home/claw
@@ -33,5 +32,5 @@ WORKDIR /data
EXPOSE 2222
# Start SSH daemon
# Fix: Enforce chmod 600 on keys before starting sshd
# Fix: StrictModes no handles permissions, but chmod 600 helps sanity.
CMD ["/bin/bash", "-c", "mkdir -p /data/ssh && if [ ! -f /data/ssh/ssh_host_rsa_key ]; then echo 'Generating persistent host keys...'; ssh-keygen -f /data/ssh/ssh_host_rsa_key -N '' -t rsa; ssh-keygen -f /data/ssh/ssh_host_ecdsa_key -N '' -t ecdsa; ssh-keygen -f /data/ssh/ssh_host_ed25519_key -N '' -t ed25519; fi && chmod 600 /data/ssh/ssh_host_*_key && /usr/sbin/sshd -D -f /etc/ssh/sshd_config"]