anti
2843aafa1a
Two leaks remained after the inotifywait argv fix:
1. The bash running journal-relay showed its argv[1] (the script path)
in /proc/PID/cmdline, producing a line like
'journal-relay /usr/libexec/udev/journal-relay'
Apply argv_zap.so to that bash too.
2. argv_zap previously hardcoded PR_SET_NAME to 'kmsg-watch', which was
wrong for any caller other than inotifywait. The comm name now comes
from ARGV_ZAP_COMM so each caller can pick its own (kmsg-watch for
inotifywait, journal-relay for the watcher bash).
3. The capture.sh header started with 'SSH honeypot file-catcher' —
fatal if an attacker runs 'cat' on it. Rewritten as a plausible
systemd-journal relay helper; stray 'attacker' / 'honeypot' words
in mid-script comments stripped too.
58 lines
1.8 KiB
Bash
58 lines
1.8 KiB
Bash
#!/bin/bash
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set -e
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# Configure root password (default: admin)
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ROOT_PASSWORD="${SSH_ROOT_PASSWORD:-admin}"
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echo "root:${ROOT_PASSWORD}" | chpasswd
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# Optional: override hostname inside container
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if [ -n "$SSH_HOSTNAME" ]; then
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echo "$SSH_HOSTNAME" > /etc/hostname
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hostname "$SSH_HOSTNAME"
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fi
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# Generate host keys if missing (first boot)
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ssh-keygen -A
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# Fake bash history so the box looks used
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if [ ! -f /root/.bash_history ]; then
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cat > /root/.bash_history <<'HIST'
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apt update && apt upgrade -y
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systemctl status nginx
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tail -f /var/log/syslog
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df -h
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htop
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ps aux | grep python
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git pull origin main
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cd /root/projects
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vim notes.txt
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crontab -e
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ls /var/www/html
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HIST
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fi
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# Logging pipeline: named pipe → rsyslogd (RFC 5424) → stdout → Docker log capture.
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# Pipe lives under /run/systemd/journal/ and the relay process is cloaked via
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# exec -a so `ps aux` shows "systemd-journal-fwd" instead of a raw `cat`.
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mkdir -p /run/systemd/journal
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mkfifo /run/systemd/journal/syslog-relay
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bash -c 'exec -a "systemd-journal-fwd" cat /run/systemd/journal/syslog-relay' &
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# Start rsyslog (reads /etc/rsyslog.d/50-journal-forward.conf, writes to the pipe above)
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rsyslogd
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# File-catcher: mirror attacker drops into host-mounted quarantine with attribution.
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# Script lives at /usr/libexec/udev/journal-relay so `ps aux` shows a
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# plausible udev helper. See Dockerfile for the rename rationale.
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# LD_PRELOAD + ARGV_ZAP_COMM blank bash's argv[1..] so /proc/PID/cmdline
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# shows only "journal-relay" (no script path leak) and /proc/PID/comm
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# matches.
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CAPTURE_DIR=/var/lib/systemd/coredump \
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LD_PRELOAD=/usr/lib/argv_zap.so \
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ARGV_ZAP_COMM=journal-relay \
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bash -c 'exec -a "journal-relay" bash /usr/libexec/udev/journal-relay' &
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# sshd logs via syslog — no -e flag, so auth events flow through rsyslog → pipe → stdout
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exec /usr/sbin/sshd -D
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