** Description changed:

+ [ Impact ]
+ 
+ Smartcard user is not selected automatically when inserting a smartcard
+ 
+ [ Test case ]
+ 
  Insert a smartcard that has an user associated to it:
-  -> gdm is expected to select the user associated to it and allow 
authentication
+  -> gdm is expected to select the user associated to it and start the 
authentication
+     requesting the card PIN, without having to explicitly write the username.
  
- SSSD side of fix is part of 2.4.1 and should be handled by 
https://github.com/SSSD/sssd/pull/5401/
-  (+ commit https://github.com/SSSD/sssd/commit/4ea1739d09b)
+ [ Regression potential ]
+ 
+ PAM configuration for smartcard changed the order [1] we check the services, 
so:
+ - if a /var/run/nologin the user will be denied for accessing the system only
+   after that the PIN has been inserted.
+ - root may be an allowed user, if associated to a smartcard (even though we 
trust SSSD
+   PAM module and configuration explicitly disallows it).
+ 
+ [1] https://salsa.debian.org/gnome-
+ team/gdm/-/compare/90e71bd4...d32be2e5
+ 
+ ---
+ 
+ There's a SSSD side of this fix (for the carts with multiple certificates) 
that is part of 2.4.1 and should be handled by 
https://github.com/SSSD/sssd/pull/5401/
+  (+ commit https://github.com/SSSD/sssd/commit/4ea1739d09b)
  
  GDM should instead handle empty users properly both in the PAM config
  and sending the info back to gnome-shell.

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https://bugs.launchpad.net/bugs/1917362

Title:
  PAM: smartcard owner isn't associated to user by default

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