** Description changed:

  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.
  
  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: 
+ 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 
+ 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

** Description changed:

  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.
+ 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

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https://bugs.launchpad.net/bugs/1619280

Title:
  ChallengeResponse authentication fails on screensaver

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