auth required pam_env.so auth required pam_unix.so try_first_pass likeauth nullok auth optional pam_permit.so account required pam_unix.so account optional pam_permit.so password required pam_cracklib.so difok=2 minlen=8 dcredit=2 ocredit=2 retry=3 password required pam_unix.so try_first_pass use_authtok nullok sha512 shadow password optional pam_permit.so session required pam_limits.so session required pam_env.so session required pam_unix.so session optional pam_permit.so