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Cookie authentication is, on the surface, a fairly straightforward system. You might wonder why you shouldn t just implement it yourself using cookies or session variables. The answer is the same reason developers don t implement features in ASP .NET ranging from session state to the web control framework. Not only does ASP .NET save you the trouble, but it also provides an implementation that s secure, well tested, and extensible. Some of the advantages provided by ASP.NET s implementation of forms authentication include the following: The authentication cookie is secure. Forms authentication is a well-tested system. Forms authentication integrates with the .NET security classes.

When deploying an application, you will probably want to purchase certificates from a genuine CA such as VeriSign. This is particularly the case with websites and Internet browsers, which recognize a limited number of certificate authorities automatically. If you use a test certificate to encrypt communication with a secured portion of a website, for example, the client browser will display a warning that the certificate is not from a known CA. IIS Manager allows you to create a certificate request automatically. First, start IIS Manager. Expand the Web Sites group, right-click your website item (often titled Default Web Site), and choose Properties. Under the Directory Security tab, you ll find a Server Certificate button (see Figure 19-6).

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Figure 18-44. The VirtualPathProvider in action With those functions in place, the application is ready to run. Of course, the VirtualPathProvider class works for resources connected with the ASP.NET ISAPI extension only. Therefore, if you want to use your own filename extensions in your application, you first have to connect this extension with the aspnet_isapi.dll ISAPI filter extension. Figure 18-44 shows the application in action. You can see three browsers in the figure, one trying to access the physical file, a second trying to access a file from the database, and a third trying to access a resource that is not available, neither in the database nor on the file system.

Cookie authentication seems simple, but if it s not implemented correctly, you can be left with an insecure system. On their own, cookies are not a safe place to store sensitive information, because a malicious user can easily view and edit cookie data. If your authentication is based on unprotected cookies, attackers can easily compromise your system. By default, the forms authentication module encrypts its authentication information before placing it in a cookie. It also attaches a hash code and validates the cookies when they return to the server to verify that no changes have been made. The combination of these two processes makes these cookies very secure and saves you from needing to write your own security code. Most examples of homemade cookie authentication are far less secure.

Figure 19-6. Configuring directory security Click the Server Certificate button to start the IIS Certificate Wizard (see Figure 19-7). This wizard requests some basic organization information and generates a request file. You ll also need to supply a bit length for the key the higher the bit length, the stronger the key.

Health monitoring is a process for verifying the application s state while being operated in production environments. It is used for several reasons such as catching errors, getting notified in case of errors, analyzing the performance of the application, getting information about the payload for the application, and much more. Monitoring usually is implemented through a mechanism called instrumentation, which is a technique used for adding events, performance counters, and tracing capabilities to an application. Through these tracing capabilities, administrators, operational staff, and developers have the possibility of monitoring the application based on several aspects. However, instrumentation is something that has to be integrated into the application s architecture in a way that makes monitoring useful and convenient. ASP.NET 2.0 ships with an integrated health monitoring system that is completely consumable through a health monitoring API. Therefore, the instrumentation capabilities are integrated into the platform. You will now learn about the fundamentals of this instrumentation system.

Forms authentication is an integral part of ASP.NET, so it has already been used in a number of web applications and websites. Because so many people use the same system, flaws are quickly discovered, publicized, and solved. As long as you keep up-to-date with patches, you have a high level of protection. On the other hand, if you create your own cookie authentication system, you do not have the advantage of this widespread testing. The first time you ll notice a vulnerability will probably be when your system is compromised.

Figure 19-7. Creating a server certificate request The generated file can be saved as a text file, but it must ultimately be e-mailed to a CA. A sample (slightly abbreviated) request file is as follows:

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