Synology DS123 Hacking

Links

What’s running

The usuals

  • cron
  • inetd
  • syslogd
  • rsyslogd
  • hotplugd

Services

  • ntpd
  • sshd
  • Apache httpd 2.2.22
  • postgres
  • cupsd
  • Sambda nmbd / smbd
  • snmpd
  • avahi-daemon
  • lighttpd for MediaServer

Layout

Generally under /usr/syno with one directory per package. Some in the usual UNIX bin etc.

Installing Debian

SynoCommunity provide a chroot package that can be installed from the DSM. It needs a little bit of work past there. Some incomplete notes:

  • admin and root have the same password, but only root can su; chroot
  • The chroot ended up in /volume1/@appstore/debian-chroot/var/chroottarget
  • Create the user and role account through DSM first
  • Copy into the chroot passwd and shadow - don’t overwrite
  • Bind mount /volume1/homes (/var/services/homes)
  • Bind mount /dev, /dev/pts, and /proc for sshd to work
  • Run sshd inside the chroot to get direct, non-root access. Use a different port in /etc/ssh/sshd_config
  • Change /etc/apt/sources.list to testing only. Drop the pinning in /etc/apt/preferences

A bit of hacking later, it seems that the scripts can do most of this for you. /var/packages/debian-chroot/scripts/start-stop-status will do the bind mounts (except /home). The Services tab lets you start and monitor the ssh server from DSM.

Next question is should I run everything inside the chroot or try to use the built-in basic services? The router will hide the port number differences.