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As previously mentioned, IIS supports several authentication mechanisms Any other configuration setting security (and therefore authentication) is configured on a per-website basis You can find the security settings on the Directory Security tab of a virtual directory s properties Figure 19-4 shows the authentication options of IIS Of course, anonymous access gives everyone access to the web page It overrides any other authentication setting of IIS because IIS authenticates only if it is necessary (and of course if anonymous authentication is enabled, no additional authentication steps are necessary for saving round-trips) Further, if you have configured anonymous authentication in IIS, you still can use ASP NET-based security to authenticate users either with ASPNET-integrated mechanisms such as forms authentication or a custom type of authentication, as you will learn later in this chapter and in subsequent chapters.

protected override void OnBeforeInstall( System.Collections.IDictionary savedState) { base.OnBeforeInstall(savedState); } protected override void OnBeforeUninstall( System.Collections.IDictionary savedState) { base.OnBeforeUninstall(savedState); } } } The previous example includes overrides for the OnBeforeInstall and OnBeforeUninstall methods, which are called immediately before the installation of the website and before the uninstall process of your site. As such, these methods are perfect when including additional installation steps such as creating a database on a SQL Server or when uninstalling (removing, or detaching, a database from SQL Server). Information about the current installation process, such as target directories or other information entered through the setup user interface or passed in as command-line parameters to the setup package, is available through the base.Context.Parameters collection of the Installer base class. The following example defines an installer class that creates a database during the installation of your web application and drops a database during the uninstall process of your web application: [RunInstaller(true)] public partial class DbInstaller : System.Configuration.Install.Installer { public DbInstaller() { InitializeComponent(); } protected override void OnBeforeInstall( System.Collections.IDictionary savedState) { try { SqlConnection conn = new SqlConnection(); conn.ConnectionString = @"data source=(local)\SQL2005;" + "integrated security=SSPI;initial catalog=master"; conn.Open(); try { // Create the database SqlCommand cmd = new SqlCommand(); cmd.Connection = conn; cmd.CommandText = "CREATE DATABASE TestDb"; cmd.ExecuteNonQuery(); // Now close the connection and connect to the // created TestDb database to create the tables // ...

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The type of identity object depends on the type of authentication used. All in all, four identity classes are included in the .NET Framework: System.Web.Security.FormsIdentity: Represents a user who is logged on using forms authentication. System.Security.Principal.WindowsIdentity: Represents a Windows user account. System.Web.Security.PassportIdentity: Provides a class to be used by the PassportAuthenticationModule. System.Security.Principal.GenericIdentity: Represents a generic user identity. (You can use this to create identities if you re creating a custom authentication system.)

Windows authentication configures IIS to validate the credentials of the user against a Windows account configured either on the local machine or within the domain When working within a domain, domain users don t need to enter their user name and password if already logged onto a client machine within the network, because the client s authentication ticket is passed to the server for authentication automatically IIS also supports Basic authentication This is an authentication method developed by the W3C that defines an additional HTTP header for transmitting user names and passwords across the wire But pay attention: nothing is encrypted The information will be transmitted Base64 encoded Therefore, you should only use Basic authentication with SSL As is the case with Windows authentication, the credentials entered by the user are evaluated against a Windows account But the way the credentials are transferred over the wire is different.

} finally { conn.Close(); } } catch { base.Rollback(savedState); } base.OnBeforeInstall(savedState); } protected override void OnBeforeUninstall( System.Collections.IDictionary savedState) { try { SqlConnection conn = new SqlConnection(); conn.ConnectionString = @"data source=(local)\SQL2005;" + "integrated security=SSPI;initial catalog=master"; conn.Open(); try { // Create the database SqlCommand cmd = new SqlCommand(); cmd.Connection = conn; cmd.CommandText = "DROP DATABASE TestDb"; cmd.ExecuteNonQuery(); } finally { conn.Close(); } } catch { base.Rollback(savedState); } base.OnBeforeUninstall(savedState); } } Of course, this is a simple example for explaining the concept of installer classes. As you can see in the previous code sample, for creating the database, you d need to connect to the master database of the server and then execute the CREATE DATABASE statement. Afterward, you d close the connection to the master database and connect to the previously created database for creating all the necessary tables, relationships, constraints, and so on. We suggest you include the SQL scripts for creating the database as an embedded resource to your installer class library to keep the code independent from the database description language parts, but basically that s the way it works.

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