#system-authentication
auth	 required	pam_env.so
auth	 sufficient	pam_unix.so nullok
auth	 required	pam_deny.so

account	 required	pam_unix.so

password sufficient	pam_unix.so use_authtok nullok
password required	pam_deny.so

session  required       pam_limits.so
session	 required	pam_unix.so
