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n the previous chapter, you learned about the basic structure of ASP.NET security. In this chapter, you will learn how you can authenticate your users using forms authentication. You should use this type of authentication whenever you do not want to use Windows-based accounts in your applications. In such cases, you need your own authentication infrastructure with a custom login page that validates a user name and password against a custom store such as your own database. This infrastructure then establishes the security context on each request again (in many cases such systems work based on cookies). If you ve ever authenticated users with ASP 3.0, you ve probably created such authentication mechanisms on your own. Fortunately, ASP.NET includes a complete infrastructure for implementing such systems. ASP .NET handles the cookies and establishes the security context on each request for you. This infrastructure is called forms authentication, and you ll learn how it works in this chapter.

(In both cases, you can override the default account, as described in 18) Sound reasons exist for using a fixed account to run ASPNET code In almost all applications, the rights allocated to the user don t match the rights needed by your application, which works on behalf of the user Generally, your code needs a broader set of permissions to perform incidental tasks, and you won t want to give these permissions to every user who might access your web application For example, your code may need to create a log record when a failure occurs, even though the current user isn t allowed to directly write to the Windows event log, file, or database Similarly, ASP NET applications always require rights to the c:\[WinDir]\MicrosoftNET\[Version]\ Temporary ASPNET Files directory to create and cache a compiled machine-language version of your web pages.

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Because forms authentication uses standard HTML forms for entering credentials, the user name and password are sent over the network as plain text. This is an obvious security risk anyone who intercepts the network traffic will be able to read the user names and passwords that are entered into the login form. For this reason, it is strongly recommended that you encrypt the traffic between the browser and the server using SSL (as described in 19), at least while the user is accessing the login page.

Finally, you might want to use an authentication system that has nothing to do with Windows For example, an e-commerce application might verify user e-mail addresses against a server-side database In this case, the user s identity doesn t correspond to a Windows account In a few rare cases, you ll want to give your code the ability to temporarily assume the identity of the user This type of approach is much more common when creating ASPNET applications for local networks where users already have a carefully defined set of Windows privileges In this case, you need to supplement your security arsenal with impersonation, as described in 22..

The basic forms authentication infrastructure works the same way as in previous versions of ASP.NET. It includes only a handful of new settings in its configuration schema, covered in the section Configuring Forms Authentication. If you have experience with ASP.NET 1.x and forms authentication, you can skip this chapter and proceed with 21.

Furthermore, it s important to include the PageIsValid condition at the beginning of this procedure The reason for this is that validation controls by default use JavaScript for client-side validation When calling PageValidate(), the validation takes place on the server This is important for browsers that either have JavaScript turned off or don t support it Therefore, if you don t include this part, validation will not happen if the browser doesn t support JavaScript or doesn t have JavaScript enabled So, you should always include server-side validation in your code The FormsAuthentication class provides two methods that are used in this example The Authenticate() method checks the specified user name and password against those stored in the webconfig file and returns a Boolean value indicating whether a match was found.

Confidentiality means ensuring that data cannot be viewed by unauthorized users while being transmitted over a network or stored in a data store such as a database Integrity is all about ensuring that nobody can change the data while it is transmitted over a network or stored in a data store Both are based on encryption Encryption is the process of scrambling data so that it s unreadable by other users Encryption in ASP NET is a completely separate feature from authentication, authorization, and impersonation You can use it in combination with these features or on its own.

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