Re: [gdm-list] how to use authentication feature of GDM in a screen saver

[Jeff Cai <Jeff Cai Sun COM>]

On Wed, 2010-04-21 at 11:00 +0800, Jeff Cai wrote:
> On Tue, 2010-04-20 at 09:55 -0400, Ray Strode wrote:
> > Hi Jeff,
> > 
> > > Currently there are two cases we need to consider, one is the
> > > environment with display switching support and the other is that of
> > > without display switching, i.e remote display.
> > right.
> > 
> > > For the environment with display switching offered by VT, we can use the
> > > GDM framework which contains the 'factory mode'. But the greeter session
> > > is always running in a VT. For screen lock, it looks like there should
> > > be more unlock greeter sessions running at the same time for different
> > > user sessions. For example, if two user sessions are locked in one
> > > machine, two unlock greeter sessions with two VTs need running.
> > Why?  Doesn't it make more sense to just have the one factory greeter session?
> GdmGreeterSlave may be one, but the unlock greeter UI should be more for
should be GdmFactorySlave.

> multiple user sessions that have been locked.
> > 
> > > For the environment without display switching, it seems hard to use
> > > GdmSessionRelay interface since GdmSessionRelay does not provide DBus
> > > interfaces that can be used by the Unlock dialog. The DBus interfaces
> > > GdmSessionRelay exposed are used by GdmProductSlave, while not GUI
> > > applications like greeter.
> > Well you guys are talking about writing new code.  The fact that the
> > dbus interface isn't exposed in the way you need it doesn't matter.
> > It's just a little more new code.
> > 
> > Nothing is a perfect fit for what you want yet, because what you want
> > isn't implemented yet.
> 
> The interfaces that can be used were not defined yet, I think. Maybe
> some DBus interfaces that can be used directly by the unlock
> application?
> 
> Jeff
> > 
> > > If we can not use the GreeterServer interface, since the implementation
> > > of PAM backend is in gdm-session-worker, how about interacting directly
> > > with gdm-session-worker? Although gdm-session-worker does not provide
> > > DBus services, we can imitate what GdmSessionDirect has done in the
> > > screen unlock program.
> > Well I think the right way to interface with the gdm-session-worker,
> > is via the GdmSession GInterface.  Note GdmSessionDirect implements
> > that interface.  GdmSessionRelay does as well.  You could potentially
> > add new code that implements that interface, and that might be the
> > right answer.  I think that code would look a lot like GdmSessionRelay
> > though, so using GdmSessionRelay might be the right answer, too.  I
> > don't have all the answers here, because I haven't implemented it,
> > yet.  I might be wrong about certain things. I'm just telling you my
> > general intuition on things.
> > 
> > --Ray
> 
> 
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