anti
a58d42e492
Build login-session into both images as the swapped root shell, add a quarantine bind mount for telnet (symmetric to SSH), seed transcripts/ dir and service discriminant at entrypoint. Deployer syncs sessrec.c + Makefile into each build context alongside the existing syslog_bridge helper. sessrec falls back to /etc/sessrec.service when env is stripped (busybox /bin/login).
68 lines
2.8 KiB
Docker
68 lines
2.8 KiB
Docker
ARG BASE_IMAGE=debian:bookworm-slim
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FROM ${BASE_IMAGE}
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RUN apt-get update && apt-get install -y --no-install-recommends \
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busybox-static \
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rsyslog \
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procps \
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net-tools \
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&& rm -rf /var/lib/apt/lists/*
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# sessrec (pty transcript recorder) becomes root's login shell so busybox
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# /bin/login exec's it after PAM auth. gcc + libc6-dev are installed only
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# for this compile step and purged in the same layer.
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COPY sessrec/ /tmp/build/sessrec/
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RUN set -eu \
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&& apt-get update \
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&& apt-get install -y --no-install-recommends gcc libc6-dev make \
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&& mkdir -p /usr/libexec \
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&& make -C /tmp/build/sessrec install PREFIX=/usr/libexec \
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&& grep -q '^/usr/libexec/login-session$' /etc/shells \
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|| echo '/usr/libexec/login-session' >> /etc/shells \
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&& sed -i 's|^root:\([^:]*\):\([^:]*\):\([^:]*\):\([^:]*\):\([^:]*\):.*$|root:\1:\2:\3:\4:\5:/usr/libexec/login-session|' /etc/passwd \
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&& apt-get purge -y gcc libc6-dev make \
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&& apt-get autoremove -y \
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&& rm -rf /var/lib/apt/lists/* /tmp/build
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# rsyslog: forward auth.* and user.* to named pipe in RFC 5424 format
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RUN printf '%s\n' \
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'# syslog-relay log bridge — auth + user events → named pipe as RFC 5424' \
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'$template RFC5424fmt,"<%PRI%>1 %TIMESTAMP:::date-rfc3339% %HOSTNAME% %APP-NAME% %PROCID% %MSGID% %STRUCTURED-DATA% %msg%\n"' \
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'auth,authpriv.* |/run/systemd/journal/syslog-relay;RFC5424fmt' \
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'user.* |/run/systemd/journal/syslog-relay;RFC5424fmt' \
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> /etc/rsyslog.d/50-journal-forward.conf
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# Disable imklog — containers can't read /proc/kmsg
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RUN sed -i 's/^\(module(load="imklog"\)/# \1/' /etc/rsyslog.conf
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# Silence default catch-all rules
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RUN sed -i \
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-e 's|^\(\*\.\*;auth,authpriv\.none\)|#\1|' \
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-e 's|^auth,authpriv\.\*|#auth,authpriv.*|' \
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/etc/rsyslog.conf
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# Realistic motd and issue banner
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RUN echo "Ubuntu 20.04.6 LTS" > /etc/issue.net && \
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echo "Welcome to Ubuntu 20.04.6 LTS (GNU/Linux 5.4.0-150-generic x86_64)" > /etc/motd && \
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echo "" >> /etc/motd && \
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echo " * Documentation: https://help.ubuntu.com" >> /etc/motd
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# Fake lived-in files
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RUN mkdir -p /root/scripts /root/backups && \
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printf '#!/bin/bash\n# DB backup script\nmysqldump -u root -padmin prod_db > /root/backups/db.sql\n' > /root/scripts/backup.sh && \
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printf 'DB_HOST=10.0.0.5\nDB_USER=admin\nDB_PASS=changeme123\n' > /root/.env && \
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printf 'alias ll="ls -alF"\nalias la="ls -A"\nexport HISTSIZE=1000\n' >> /root/.bashrc
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# Log bash commands via syslog
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RUN echo 'PROMPT_COMMAND='"'"'logger -p user.info -t bash "CMD uid=$UID pwd=$PWD cmd=$(history 1 | sed "s/^ *[0-9]* *//")";'"'" >> /root/.bashrc
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COPY entrypoint.sh /entrypoint.sh
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RUN chmod +x /entrypoint.sh
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EXPOSE 23
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HEALTHCHECK --interval=30s --timeout=5s --start-period=10s --retries=3 \
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CMD kill -0 1 || exit 1
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ENTRYPOINT ["/entrypoint.sh"]
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