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First, using web.config as a credential store is possible for simple solutions with just a few users only. In larger scenarios, you should use the membership API, which is described in 21. Second, you can hash password values for credentials stored in the web.config file. Hashing is nothing more than applying one-way encryption to the password. This means the password will be encrypted in a way that it can t be decrypted any more. You will learn how you can hash passwords correctly when creating a custom membership provider in 26.

Once a user is authenticated, information such as the user s name and security context is automatically made available by the ASP.NET infrastructure. You can access this information through the HttpContext.Current.User object and use this information to implement authorization in your code. Furthermore, ASP.NET includes the following prebuilt modules for implementing authorization: UrlAuthorization: The UrlAuthorization module works based on the content of the <authorization> configuration in the web.config files of different directories of your web application. It can restrict access to both directories and files, based on the user s name or the roles assigned to the user. FileAuthorization: When using Windows authentication in intranets, ASP.NET automatically uses the FileAuthorization module for authorizing Windows users against files accessed by ASP.NET based on Windows ACLs. Therefore, each Windows user must have at least read access rights on the files of the web applications in that case. This module works with Windows authentication only but without impersonation. When impersonating users in Windows environments, you can even configure ACLs on registry entries or any other resource on the machine, and Windows does authorization based on the Windows user for you.

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(Of course, you can t force them to do so, but if your information is designed appropriately, you might get most of them to do it) Threat modeling as an analysis method helps you determine issues such as these, not merely the technical issues Threat modeling is a big topic that is beyond the scope of this book; refer to Michael Howard and David LeBlanc s Writing Secure Code, Second Edition (Microsoft Press, 2002) or Frank Swiderski and Window Snyder s Threat Modeling (Microsoft Press, 2004)..

As mentioned earlier, you do not need to restrict access to pages in order to use authentication. It is possible to use authentication purely for personalization so that anonymous users view the same pages as authenticated users (but see slightly different, personalized content). However, to demonstrate the redirection functionality of forms authentication, it s useful to create an example that denies access to anonymous users. This will force ASP.NET to redirect anonymous users to the login page. 23 describes authorization in detail. For now, you ll use the simple technique of denying access to all unauthenticated users. To do this, you must use the <authorization> element of the web.config file to add a new authorization rule, as shown here: <configuration> <system.web> <!-- Other settings omitted. --> <authorization>

Caution Using impersonation is tricky (if not dangerous). It requires you to properly configure ACL entries on every object for every group, or sometimes even every user. A simple configuration mistake can lead to a security hole in your application. When the number of users (and Windows groups) grows, the situation gets more and more complex, and therefore configuration errors may happen. You shouldn t use impersonation if it s not really necessary. You should always prefer to create custom application roles and perform authorization based on these roles.

Of course, a secure architecture and design alone doesn t make your application completely secure It s only one of the most important factors After you have created a secure architecture and design, you have to write secure code as well Again, Writing Secure Code, Second Edition (Microsoft Press, 2002) is an excellent source for detailed information for every developer In terms of web applications, you should always keep the following guidelines in mind when writing code: Never trust user input: Assume that every user is evil until you have proven the opposite Therefore, always strongly validate user input Write your validation code in a way that it verifies input against only allowed values and not invalid values (There are always more invalid values than you might be aware of at the time of writing the application.

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