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In many cases authorization is performed on groups of users called roles. One role can contain many users, and a user can be assigned to many roles. ASP.NET 2.0 includes a ready-to-use API that allows you to assign users to roles as needed. Again, you can do this programmatically through the Roles API or with the ASP.NET web configuration utility. In 23, you will learn about the details of using the Roles API in your applications.

After you have created a couple of users, you can connect to the database through Visual Studio s Server Explorer and look at the aspnet_Users and aspnet_membership tables in the database, as shown in Figure 21-11.

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Forms authentication includes the possibility of storing the password in different formats In the <credentials /> configuration section, the format of the password is specified through the passwordFormat attribute, which has three valid values: Clear: The passwords are stored as clear text in the <user /> elements of the <credentials /> section MD5: The hashed version of the password is stored in the <user /> elements, and the algorithm used for hashing the password is the MD5 hashing algorithm SHA1: The <user /> elements in the <credentials /> section of the webconfig file contain the hashed password, and the algorithm used for hashing the password is the SHA1 algorithm When using the hashed version of the passwords, you have to write a tool or some code that hashes the passwords for you and stores them in the webconfig file.

Of course, if your web application authenticates users, these users may want to persist settings on your website for subsequent visits. Typically, for this use case you implement so-called user profiles that persist settings on a per-user basis between different visits of your website. The big difference between user profiles and session state is that profiles are persistent across multiple sessions. Again, ASP.NET 2.0 includes a ready-to-use infrastructure for managing profiles in your application. In 24, you will learn how you can use the Profiles API in your application.

Both the password and the answer for the password question are stored as a salted hash in the database because you have selected the passwordFormat="Hashed" option for the provider in the <membership> configuration section. After you have added users to the membership store, you can authenticate those users with the membership API. For that purpose, you have to create a login page that queries the user name and password from the user and then validates those credentials against the credential store, as follows: Protected Sub LoginAction_Click(ByVal sender As Object, ByVal e As EventArgs) If Membership.ValidateUser(UsernameText.Text, PasswordText.Text) Then FormsAuthentication.RedirectFromLoginPage(UsernameText.Text, False) Else LegendStatus.Text = "Invalid user name or password!" End If End Sub You don t need to know about which provider is actually used by the application. If you want to use a different membership provider, you just need to change the configuration so that the membership API uses this different provider. Your application doesn t know about any details of the underlying provider. Furthermore, in the next section you will learn about the new security controls. You will see that you don t need to create the controls for the login page manually any more.

For storing the password, you should then use the FormsAuthenticationHashForStoringInConfigFile method instead of passing in the clear-text password as follows: string hashedPwd = FormsAuthenticationHashForStoringInConfigFile( clearTextPassword, "SHA1"); The first parameter specifies the clear-text password, and the second one specifies the hash algorithm you should use The result of the method call is the hashed version of the password If you want to modify users stored in webconfig as shown previously, you have to use the configuration API of the NET Framework You cannot edit this section with the web-based configuration tool The following code snippet shows how you can modify the section through the configuration API: Configuration MyConfig = WebConfigurationManagerOpenWebConfiguration("~/"); ConfigurationSectionGroup SystemWeb = MyConfigSectionGroups["systemweb"]; AuthenticationSection AuthSec = (AuthenticationSection)SystemWebSections["authentication"]; AuthSecFormsCredentialsUsersAdd( new FormsAuthenticationUser(UserTextText, PasswordTextText)); MyConfig.

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