Public bug reported:
Binary package hint: cupsys
Another problem caused by cupsys not running as root:
When doing administration over the web interface (e.g. adding a new
printer), cupsys requires authentication as root.
cupsys uses pam. pam is usually configured to verify as unix password
from /etc/passwd, /etc/shadow. Since cupsys is not running as root, it
can't open /etc/shadow. libpam then runs /sbin/unix_chkpwd to verify the
password.
For reasons of security, /sbin/unix_chkpwd does not allow to verify any
other password than the one of the user running the process.
-> pam/unix_chkpwd can verify the user cupsys only
-> cupsys itself requires to authenticate as root
-> does not work.
Solution: add cupsys to the group shadow.
regards
Hadmut
** Affects: cupsys (Ubuntu)
Importance: Untriaged
Status: Unconfirmed
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Authentication fails
https://launchpad.net/bugs/56602
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