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Re: SuSE loading PAM?

Jason Gerfen wrote:

I am writting a pam module and it works fine, does simple logging of login attempts etc. The problem with this is it only seems to load if I use the /etc/pam.d/gdm file to load it.

For all Gnome Display Manager login's, it will use the gdm file.

From what I understand about PAM the /etc/pam.d/login file should be the one to load the module to log authentication attempts correct?

/etc/pam.d/login is used for text-console-based logins. This is the beauty of PAM - different login mechanisms for different services.

Second question, as I am writting this I attempt to get the current owner of the process and it is coming up as UID & EUID as 3? Is this a system user? I could not google up anything on this behavior.

Look in /etc/passwd for the account with UID of 3.

My third question is if PAM is not running as the root user is there an existing module that will switch to the root user on the fly in order to run some authentication commands before returning to the normal user? Any help is appreciated...

There is no mechanism to switch to root for the authentication. Often, a service will be running as root. When an authentication request comes in, a separate process will be fork()ed, and that process switches from root to the user that just authenticated, while the service starts listening again for new connections.

If you build a PAM-aware application, make sure that it is executed as root, or any authentications will fail (because only root has access to the shadow password files).

I was playing with a test application, and it would only allow the current user to authenticate. As soon as the application became root and could gain access to the shadow files, I could authenticate any user in the files.

I hope I've answered a few questions in my ramblings. Let me know if I haven't.


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