Re: [gdm-list] Face recognition for linux login ...
- From: José Miguel Buenaposada Biencinto <josemiguel buenaposada urjc es>
- To: Brian Cameron <Brian Cameron Sun COM>
- Cc: gdm-list gnome org
- Subject: Re: [gdm-list] Face recognition for linux login ...
- Date: Thu, 25 Jan 2007 13:18:20 +0100
First of all, forgive me for answering so late :-(.
Thanks for your advice .... it works!!!
Brian Cameron wrote:
> All gdm GUI's run as the "gdm" user (refer to User/Group settings
> in the GDM configuration). The default values are gdm:gdm.
> Note that GDM saves it's Xauthority cookies in /var/lib/gdm
> (some distros may modify the servauthdir directory, but this is
> the normal default for most distros so you shouldn't hardcode
> this directory and make it configurable for your PAM module).
> So you should be able to grab the Xauth cookie from here. I
> believe the file named .cookie is the cookie that the root user
> can use when GDM is showing the GUI.
> Since your PAM module code should be running as root, grabbing
> and using the Xauth key for the gdm user should be possible to
> I hope this helps. Let me know.
>> First of all I have to introduce myself, I'm a Computer Vision
>> researcher interested in human computer interaction. And
>> I apologize if this is a bit off-topic (although it could not be).
>> Some time ago I asked for advice in the gdm-list about
>> implementing face recognition for linux login on gdm:
>> And Bob Doolittle sugested to implement such a thing as a PAM module:
>> Anyhow, we are now developing the face recognition driven linux login
>> (on a master thesis) using a PAM module. The problem we have now is
>> how to deal with the Xserver security (when using Xauthority) in
>> order to show
>> a graphical window with the video aside the gdm login window.
>> What we are doing is to fork a process in the PAM module to run
>> the face recognition loop on the the child process. And when we try
>> to show
>> a simple graphical window the X server don't allow us to connect ... we
>> are not even logged into the system and we are not using the rigth
>> magic cookie !!
>> And the question is, what is the unix user from which the gdm is
>> what can we do to launch a window from a process aside the gdm login
>> Please, answer me directly as I'm not in the list.
>> Many thanks for any advice.
>> Jose M. Buenaposada.
] [Thread Prev