auth       requisite  pam_securetty.so
auth       requisite  pam_nologin.so
auth       required   pam_env.so
auth       sufficient pam_unix.so nullok 
auth       sufficient pam_krb5.so try_first_pass
auth       required   pam_deny.o
account    required   pam_unix.so
session    required   pam_unix.so
session    optional   pam_openafs_session.so 
session    optional   pam_lastlog.so
session    optional   pam_motd.so
session    optional   pam_mail.so standard noenv
password   required   pam_unix.so nullok obscure min=4 max=8 md5