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All principal objects implement the IPrincipal interface, which defines a core set of functionality. When you access the User property of the current web page (System.Web.UI.Page) or from the current HTTP context (HttpContext.Current), you re accessing an IPrincipal object that represents the security context of the current user. The IPrincipal interface defines a single property named Identity, which retrieves an IIdentity object that provides information about the current user. The IPrincipal interface also defines a single method named IsInRole(), which allows you to test whether the current user is a member of a specific role. Here s an example that uses the IsInRole() method to test whether the current user is a member of a role named Admin: if (HttpContext.Current.User.IsInRole("Admin")) { // (Do something.) } When using Windows authentication or forms authentication, the principal object is created automatically. However, it s also possible to create a principal object on the fly, with user and role information that you extract from another location, such as a custom database. You ll see examples of both techniques in later chapters.

Never store sensitive data or business-critical data in view state: View state is just another hidden field on the page, and it can be decoded and viewed easily. If you use the EnableViewStateMAC=true setting for your page, view state will be signed with a message authentication code that is created based on a machine key of the web server s machine.config. We recommend using EnableViewStateMAC=true as soon as you include data in your view state that should not be changed by users browsing your web page. See 6 for more about protecting view state. Enable SSL when using Basic authentication or ASP.NET forms authentication: 20 discusses forms authentication. SSL is discussed later in this chapter in the section Understanding SSL. Protect your cookies: Always protect your authentication cookies when using forms authentication, and set timeouts as short as possible and only as long as necessary. Use SSL: In general, if your web application processes sensitive data, secure your whole website using SSL. Don t forget to protect even image directories or directories with other files not managed by the application directly through SSL. Of course, these are just a few general, important issues. To get a complete picture of the situation in terms of your concrete application, you have to create threat models in order to compile a complete list of potential dangers. In addition, invest in ongoing education, because hackers techniques and technologies evolve just as other techniques and technologies do. If you forget about just one of these guidelines, all the other security features are more or less useless. Never forget the following principle: security is only as good as your weakest link.

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The ASP.NET page shown in Figure 20-2 contains the text boxes for entering the values. Note that the URL includes the originally requested page as a query parameter. This parameter is used by the FormsAuthentication class later for redirecting to the originally requested page. If not present, it uses the page configured in the defaultUrl attribute of the <forms /> configuration tag.

Like the IPrincipal interface, the IIdentity interface provides consistency no matter what authentication scheme you use. All identity objects must implement IIdentity.

A good way for increasing the security of your application is to have many components in place that are enforcing security. Gatekeepers are a conceptual pattern that applies a pipelining model to a security infrastructure. This model helps you tighten your security. The gatekeeper model assumes that a secure application has always more security mechanisms in place than necessary. Each of these mechanisms is implemented as a gatekeeper that is responsible for enforcing some security-related conditions. If one of these gatekeepers fails, the attacker will have to face the next gatekeeper in the pipeline. The more gatekeepers you have in your application, the harder the attacker s life will be. Actually, this model supports a core principle for creating secure applications: be as secure as possible, and make attackers lives as hard as possible. In Figure 19-1, you can see a pipeline of gatekeepers. At the end of the pipeline, you can see the protected resource (which can be anything, even your custom page code). The protected resource will be accessed or executed only if every gatekeeper grants access. If just one gatekeeper denies access, the request processing is returned to the caller with a security exception. Implementing a central security component in such a way is generally a good idea. You can also secure your business layer in this way. The ASP .NET application infrastructure leverages this mechanism as well. ASP.NET includes several gatekeepers, each one enforcing a couple of security conditions and therefore protecting your application. In the next sections of this chapter, you will learn which gatekeepers the ASP.NET framework includes and what are the responsibilities of those gatekeepers.

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