From Bugzilla Helper: User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7b) Gecko/20040317 Description of problem: the /etc/pam.d/system-auth file as generated by authconfig can (perhaps it always does) contain the option likeauth to pam_unix.so. That option is not documented anywhere that I could find. There is no man page for pam_unix (which is really a bug in itself), but there is some information in /usr/share/doc/pam-0.75/txts/README.pam_unix. Not about likeauth though. Version-Release number of selected component (if applicable): pam-0.75-51 How reproducible: Always Steps to Reproduce: 1. man pam_unix 2. man pam_unix.so 3. get coffee Actual Results: Nothing. Expected Results: I should have been enlightened. Additional info:
Some info here on the PAM mailing list: http://www.spinics.net/lists/pam/msg03533.html
Actually this option is not useful and was necessary only in older PAM. It shouldn't be used by default but it does no harm if used.