When login to system (in IPA domain) via lightdm, kerberos credentials are automatically created. After logout, they are not destroyed.

Steps for reproduse:

  1. Login to system via GUI as user.
  2. Logout.
  3. Login as root, and su - user
  4. klist shows credentials for user and you have ability to login other machines in domain as that user

For workaround in GDM I add:
sudo -u ${USERNAME} kdestroy
before exit 0 to /etc/gdm/PostSession/Default


This is a known (minor) issue with SSSD that serves as FreeIPA domain client. You can check for additional information in in:

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