http file access and php sessions

Question

If a site has php session's in place to enforce authentication/authorization to pages on the site which are implemented in php, how does the same logic enforce access to certain files.

Lets say a repository of files in a directory. So /var/www/html/ is protected via authentication however, this PHP authentication logic won't prohibit a user from simply going to http://site.com/someDirectory/fileIShouldNotAccess.txt and pulling that file.

How do you couple the php session and authentication with apache to enforce this type of behavior?

Answer 1

A couple answers:

1) make your php sessions use HTTP authentication. Then you can use a .htaccess file to control file access in directories

2) Use mod_rewrite to redirect all requests to a "front controller". Let the front controller manage whether access is allowed, denied, or forwarded to a different controller module for further processing.

Answer 2

You can try HTTP Authentication with PHP. This article might help.

Answer 3

Since PHP won't be invoked when the user requests a non-PHP file, you can't have Apache enforce PHP's access protection. You can make a very coarse and easy-to-fake check in Apache to make sure that a session ID cookie is present, but that's highly insecure. It just checks if the cookie's there, not that it represents a valid session or that the user's actually been granted access.

This other answer might help. http://stackoverflow.com/questions/2187200/using-php-apache-to-restrict-access-to-static-files-html-css-img-etc. Basically, you serve up all the protected content via a PHP script, instead of providing direct access.