You can limit where you can login by restricting which terminals you want to use. By default, lots of terminals are active. This can be resovled by only allowing one terminal. Open the
sudo vi /etc/securetty
Change which terminal you want to use and disable. For example, if you want to only allow
tty1, you have to disable all other terminals using the
tty1 #tty2 #tty3 #tty4 # etc ...
You will also need to secure the
/etc/securetty file to make sure only root can modify it.
sudo chown root:root /etc/securetty sudo chmod 0600 /etc/securetty