debathena-workstation should notify on remote root logins

[geofft]

If I ssh to root at a remote debathena-workstation machine (or possibly a sudoer at a a remote debathena-workstation machine), a locally logged in user should be notified of this. Athena 9 did this via the "console" applet.

[geofft]

One option is to get the syslogd to libnotify the current user, but it doesn't look like there's an easy way to find the current user(s) and libnotify them. If you're root, you can play stupid tricks with /proc/*/environ and get the D-Bus address of session bus.

[broder]

Oh man - we can do this with ConsoleKit?, too!

Incoming ssh connections will emit a org.freedesktop.ConsoleKit.Manager.SeatAdded signal from the object path /org/freedesktop/ConsoleKit/Manager

We can catch that, track down the session on that seat, and see if it's root (or maybe a user with sudo privileges? although the logic to determine that is kind of tricky)

And we can do it from a daemon that's started from /etc/X11/Xsession.d, so it'll already know what user to notify.

[jdreed]

Ugh, I don't want to create a new daemon. This is really blocking on #286.