I realize this question is vague. I'm just looking for some direction. Using the example of a company intranet, what are some common approaches to security? The user would obviously need to authenticate to the site, but based on various attributes (e.g. location, department, level, etc.) the user would only see certain content on the site. I am currently considering an ASP.NET 3.5 application that stores users and related user attributes in a SQL table. The links would also be stored in the database along with the user attributes and file permissions related to that link. On the other hand maybe using AD and groups is a better approach.
I don't necessarily need a detailed explanation of web application security models. I'm just looking for direction on how to research it further. For example, is there a good book that explains how to implement a web application security model that goes beyond a simple username and password? Are there certain topics to research such as "role based security" or "content management"?