Possible to use mod_auth to protect a mod_rewrite directory?

[eluser]randomdriver[/eluser]
Generally you can drop and .htaccess file into a directory to protect that directory with additional security.

I'd like to do that with codeigniter. The problem is, the directories don't exist, they are mod_rewrites, so for example:

/admin/ is really:

/index.php/admin/

For peace of mind, I want 2 levels of login. Apache mod_auth and then the current CI authorization I have. Reason being, if someone screws up and forgets to check for the session in the code and it goes unnoticed I'm hosed. This will at least prevent that for now

[eluser]toopay[/eluser]
Putting authentification on mod_rewrite is a bad idea. Except for a serious specific reasons, use some proper redirection instead mod_auth!