Re: [gdm-list] Help && I want to be part of the fun with GDM

[Brian Cameron <brian cameron oracle com>]

This is correct.  GDM uses PAM for authentication.  The GDM daemon
talks to PAM in the daemon/gdm-session-worker.c code.  Any
authentication prompts or messages are just passed via D-Bus to the
login GUI.  If the PAM module requests any text-input, then the daemon
informs the GUI to setup the entry field for the user to enter in a
response (such as username or password).

A PAM module that does face authentication probably does not require any
input, so it would probably just display a message telling the user to
position their face in front of the camera and block until
authentication is successful.  Once the PAM conversation is
authenticated, GDM will start the normal user session.

So, it sounds like most, if not all, of the work you need to do is
writing a new PAM module.  I'd think GDM wouldn't need any work unless
you find a bug in how GDM works with custom PAM modules.

Brian


On 07/ 3/10 02:54 AM, Josselin Mouette wrote:
> Le vendredi 02 juillet 2010 à 16:19 +0800, 吴琼 a écrit :
> >                   I'm a newbie of the gdm project. and i have a plan to
> > do some custom design with the gdm,for example:add a function of face
> > authentication. I hav dived in to the sources a whole day,and find out
> > the procedure of sent some msgs through  dbus.but didn't get known how
> > the greeter recieve the msg and call the specifid method.
>
> Any kind of authentication should be dealt with a PAM module, not
> directly in GDM itself.
>
> See http://www.kernel.org/pub/linux/libs/pam/
>
> Cheers,
>
>
>
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