Public bug reported: Issue: I'm currently using yubikey as 2nd factor authentication with "challenge-response" method. After locking the desktop screen I'm currently unable to login again from gnome-screensaver.
Using Ubuntu 16.04 current version of libpam-yubico is 2.20-1 I tracked down the bug to this one already fixed upstream in version 2.22: https://github.com/Yubico/yubico-pam/issues/92 Detailed example to reproduce: eg. my /etc/pam.d/common-auth contains #auth required pam_yubico.so mode=challenge-response chalresp_path=/var/yubico After authentication in gdm or textual login screen the challenge response file permission get changed to the one of the process that is authenticating (root-root). My initial permission of the challenge file -rw------- 1 root root If I change permissions to -rw------- 1 my-user my-user the lockscreen authentication works again correctly. As soon as I login again from gdm the permissions go back to: -rw------- 1 root root ** Affects: yubico-pam (Ubuntu) Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1619280 Title: ChallengeResponse authentication fails on screensaver To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/yubico-pam/+bug/1619280/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
