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format containing only the characters allowed for user names and passwords. Second, the RegularExpressionValdiator controls ensure that only valid values are entered in the User Name text field and in the Password text field. For example, the user name may contain letters, digits, and spaces only. Therefore, the validation expression looks like this: ValidationExpression="[\w| ]*" The \w character class is equivalent to [a-zA-Z_0-9], and the space afterward allows spaces in the user name. The password, for example, may also contain special characters. Therefore, the validation expression looks different from the previous one, as shown here: ValidationExpression='[\w| !" $%&/()=\- \*]*' Note that the single quote is used for enclosing the attribute value, because this uses the double quote as the allowed special character. Furthermore, because the attribute is contained in the tag code (and therefore the HTML entity), & indicates that the ampersand (&) character is allowed in the password. You can see the validation controls in action in Figure 20-3.

Authentication is the process of discovering a user s identity and ensuring the authenticity of this identity. The process of authentication is analogous to checking in at a conference registration table. First, you provide some credentials to prove your identity (such as a driver s license or a passport). Second, once your identity is verified with this information, you are issued a conference badge, or token, that you carry with you when you are at the conference. Anyone you meet at the conference can immediately determine your identity by looking at your badge, which typically

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As you will see in 20, when using forms authentication, you need to authenticate your users against a custom store. This means you must do much more than create a basic login page for validating user names and passwords. Of course, you need a way to manage users as well as assign users to roles. With ASP.NET 1.x you had to create such management tools and components for programmatic management on your own. ASP.NET 2.0 provides this infrastructure through the Membership API, the Roles API, and the Profiles API.

As you can see in Figure 20-3, with validation controls in place you can stop users from entering values for the user name or password that would lead to a SQL injection attack. In addition to using parameterized SQL queries (introduced in 7), you should always use validation controls to mitigate this type of attack in your applications. The last step for creating the login page is to write the code for validating the credentials against the values entered by the user. You have to add the necessary code to the Click event of the login button. Because the following Click event is using the credentials store of the web.config file, validation is fairly easy: Protected Sub LoginAction_Click(ByVal sender As Object, ByVal e As EventArgs) Page.Validate() If (Not Page.IsValid) Then Return End If

contains basic identity information, such as your first and last name. This whole process is an example of authentication. Once your identity is established, your token identifies you so that everywhere you go within a particular area, your identity is known. In an ASP.NET application, authentication is implemented through one of four possible authentication systems: Windows authentication Forms authentication Passport authentication A custom authentication process In each of these, the user provides credentials when logging in. The user s identity is tracked in different ways depending on the type of authentication. For example, the Windows operating system uses a 96-bit number called a SID (security identifier) to identify each logged-on user. In ASP .NET forms authentication (which is covered in detail in 20), the user is given a forms authentication ticket, which is a combination of values that are encrypted and placed in a cookie. All authentication does is allow the application to identify who a user is on each request. This works well for personalization and customization, because you can use the identity information to render user-specific messages on the web pages, alter the appearance of the website, add custom content based on user preferences, and so on. However, on its own, authentication isn t enough to restrict the tasks that a user is allowed to perform based on that user s identity. For that, you need authorization, described in a moment. However, before you learn about authorization, you will take a look at impersonation, which is related to authentication.

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