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# syntax=docker/dockerfile:latest
FROM scratch AS files
# Copy ssh-audit code to temporary container
COPY ssh-audit.py /
COPY src/ /
FROM python:3-alpine AS runtime
# Update the image to remediate any vulnerabilities.
RUN apk upgrade -U --no-cache -a -l && \
# Remove suid & sgid bits from all files.
find / -xdev -perm /6000 -exec chmod ug-s {} \; 2> /dev/null || true
# Copy the ssh-audit code from files container.
COPY --from=files / /
# Allow listening on 2222/tcp for client auditing.
EXPOSE 2222
# Drop root privileges.
USER nobody:nogroup
ENTRYPOINT ["python3", "/ssh-audit.py"]
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