anti
69510fb880
Rename the rsyslog→stdout pipe from /var/run/decnet-logs (dead giveaway) to /run/systemd/journal/syslog-relay, and launch the relay via exec -a "systemd-journal-fwd" so ps shows a plausible systemd forwarder instead of a bare cat. Casual ps/ls inspection now shows nothing with "decnet" in the name.
91 lines
3.9 KiB
Docker
91 lines
3.9 KiB
Docker
ARG BASE_IMAGE=debian:bookworm-slim
|
|
FROM ${BASE_IMAGE}
|
|
|
|
RUN apt-get update && apt-get install -y --no-install-recommends \
|
|
openssh-server \
|
|
sudo \
|
|
rsyslog \
|
|
curl \
|
|
wget \
|
|
vim \
|
|
nano \
|
|
net-tools \
|
|
procps \
|
|
htop \
|
|
git \
|
|
inotify-tools \
|
|
psmisc \
|
|
iproute2 \
|
|
jq \
|
|
&& rm -rf /var/lib/apt/lists/*
|
|
|
|
RUN mkdir -p /var/run/sshd /root/.ssh /var/log/decnet /var/decnet/captured \
|
|
&& chmod 700 /var/decnet /var/decnet/captured
|
|
|
|
# sshd_config: allow root + password auth; VERBOSE so session lines carry
|
|
# client IP + session PID (needed for file-capture attribution).
|
|
RUN sed -i \
|
|
-e 's|^#\?PermitRootLogin.*|PermitRootLogin yes|' \
|
|
-e 's|^#\?PasswordAuthentication.*|PasswordAuthentication yes|' \
|
|
-e 's|^#\?ChallengeResponseAuthentication.*|ChallengeResponseAuthentication no|' \
|
|
-e 's|^#\?LogLevel.*|LogLevel VERBOSE|' \
|
|
/etc/ssh/sshd_config
|
|
|
|
# rsyslog: forward auth.* and user.* to named pipe in RFC 5424 format.
|
|
# The entrypoint relays the pipe to stdout for Docker log capture.
|
|
RUN printf '%s\n' \
|
|
'# DECNET log bridge — auth + user events → named pipe as RFC 5424' \
|
|
'$template RFC5424fmt,"<%PRI%>1 %TIMESTAMP:::date-rfc3339% %HOSTNAME% %APP-NAME% %PROCID% %MSGID% %STRUCTURED-DATA% %msg%\n"' \
|
|
'auth,authpriv.* |/run/systemd/journal/syslog-relay;RFC5424fmt' \
|
|
'user.* |/run/systemd/journal/syslog-relay;RFC5424fmt' \
|
|
> /etc/rsyslog.d/99-decnet.conf
|
|
|
|
# Silence default catch-all rules so we own auth/user routing exclusively
|
|
RUN sed -i \
|
|
-e 's|^\(\*\.\*;auth,authpriv\.none\)|#\1|' \
|
|
-e 's|^auth,authpriv\.\*|#auth,authpriv.*|' \
|
|
/etc/rsyslog.conf
|
|
|
|
# Sudo: log to syslog (auth facility) AND a local file with full I/O capture
|
|
RUN echo 'Defaults logfile="/var/log/sudo.log"' >> /etc/sudoers && \
|
|
echo 'Defaults syslog=auth' >> /etc/sudoers && \
|
|
echo 'Defaults log_input,log_output' >> /etc/sudoers
|
|
|
|
# Lived-in environment: motd, shell aliases, fake project files
|
|
RUN echo "Ubuntu 22.04.3 LTS" > /etc/issue.net && \
|
|
echo "Welcome to Ubuntu 22.04.3 LTS (GNU/Linux 5.15.0-88-generic x86_64)" > /etc/motd && \
|
|
echo "" >> /etc/motd && \
|
|
echo " * Documentation: https://help.ubuntu.com" >> /etc/motd && \
|
|
echo " * Management: https://landscape.canonical.com" >> /etc/motd && \
|
|
echo " * Support: https://ubuntu.com/advantage" >> /etc/motd
|
|
|
|
RUN echo 'alias ll="ls -alF"' >> /root/.bashrc && \
|
|
echo 'alias la="ls -A"' >> /root/.bashrc && \
|
|
echo 'alias l="ls -CF"' >> /root/.bashrc && \
|
|
echo 'export HISTSIZE=1000' >> /root/.bashrc && \
|
|
echo 'export HISTFILESIZE=2000' >> /root/.bashrc && \
|
|
echo 'PROMPT_COMMAND='"'"'logger -p user.info -t bash "CMD uid=$UID user=$USER src=${SSH_CLIENT%% *} pwd=$PWD cmd=$(history 1 | sed "s/^ *[0-9]* *//")";'"'" >> /root/.bashrc
|
|
|
|
# Fake project files to look lived-in
|
|
RUN mkdir -p /root/projects /root/backups /var/www/html && \
|
|
printf '# TODO: migrate DB to new server\n# check cron jobs\n# update SSL cert\n' > /root/notes.txt && \
|
|
printf 'DB_HOST=10.0.0.5\nDB_USER=admin\nDB_PASS=changeme123\nDB_NAME=prod_db\n' > /root/projects/.env && \
|
|
printf '[Unit]\nDescription=App Server\n[Service]\nExecStart=/usr/bin/python3 /opt/app/server.py\n' > /root/projects/app.service
|
|
|
|
COPY entrypoint.sh /entrypoint.sh
|
|
# Capture machinery is installed under plausible systemd/udev paths so casual
|
|
# `ps aux` inspection doesn't scream "honeypot". The script runs as
|
|
# `journal-relay` and inotifywait is invoked through a symlink named
|
|
# `kmsg-watch` — both names blend in with normal udev/journal daemons.
|
|
COPY capture.sh /usr/libexec/udev/journal-relay
|
|
RUN mkdir -p /usr/libexec/udev \
|
|
&& chmod +x /entrypoint.sh /usr/libexec/udev/journal-relay \
|
|
&& ln -sf /usr/bin/inotifywait /usr/libexec/udev/kmsg-watch
|
|
|
|
EXPOSE 22
|
|
|
|
HEALTHCHECK --interval=30s --timeout=5s --start-period=10s --retries=3 \
|
|
CMD kill -0 1 || exit 1
|
|
|
|
ENTRYPOINT ["/entrypoint.sh"]
|