login system with CI 3.0

Hi!

I am sorry that I didn't reply this answer. I forgotten. Thank you your answer. I use SESSION and MySQL at login system.
I always check that session (just "admin" rank is correct) exsits on every page. (I make a MY_Controller file where this process always occurs) If not than I redirect users to login page. I always use form validation library (and xss protect). What is missing from the system? Thank you! I will see Ion Auth.