CKFinder 1.1 and Drupal

Hi. I'm currently using Drupal 5.5 and am attempting to get CKFinder 1.1 to work with the FCKEditor module. The problem is the authorization check function. Everything works if I have it return true but that's a security risk to allow access unconditionally like that. However, Drupal's user_access() function doesn't seem to work in there and $_SESSION is empty. Has anyone else come across this problem and knows of a solution? Thanks.