[CentOS] webserver setup

Hi,

I have setup a webserver on CentOS 4.5 with NameVirtualHost.
Two VirtualHost should be reachable by port 80 from outside, while the
third (default) should be only reachable by https from outside but by
http from inside. 
Since all share the same IP firewalling seems to be out of question. So
is there a way to restrict that in Apache config?

regards, Andreas