shadow/passwd

   1 #%PAM-1.0
   2 #password       required        pam_cracklib.so difok=2 minlen=8 dcredit=2 ocredit=2 retry=3
   3 #password       required        pam_unix.so sha512 shadow use_authtok
   4 password        required        pam_unix.so sha512 shadow nullok