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Figure 18-39. Building a web setup project in Visual Studio 2005 As you can see, every project referenced in the web setup project will be built automatically before Visual Studio starts building the web setup project. Now you can test your web setup project by right-clicking it in Solution Explorer and selecting Install. This starts the setup process for the web application project and performs a complete installation of your website on the target machine. Of course, IIS and the .NET Framework 2.0 need to be installed on the target machine first.

So, how do authentication, authorization, and impersonation all work together in a web application When users first come to your website, they are anonymous. In other words, your application doesn t know (and doesn t care) who they are. Unless you authenticate them, this is the way it stays. By default, anonymous users can access any ASP.NET web page. But when a user requests a web page that doesn t permit anonymous access, several steps take place (as shown in Figure 19-2): 1. The request is sent to the web server. Since the user identity is not known at this time, the user is asked to log in (using a custom web page or a browser-based login dialog box). The specific details of the login process depend on the type of authentication you re using. 2. The user provides their credentials, which are then verified, either by your application (in the case of forms authentication) or automatically by IIS (in the case of Windows authentication). 3. If the user credentials are legitimate, the user is granted access to the web page. If their credentials are not legitimate, then the user is prompted to log in again, or they are redirected to a web page with an access denied message.

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Regardless of the authentication system, ASP.NET uses the same underlying model to represent user and role information. Users who log into a web application are granted a principal and an identity based on the credentials they have provided. The principal object represents the current security context of the user. It combines the user itself (the identity) with information stored in the account records for the current user such as the roles, privileges, and much more. It therefore allows you to perform role-based authorization, and it provides a reference to the corresponding identity object. The identity object represents the successfully authenticated user and therefore provides user information such as the user name.

Caution There is one little annoying caveat with web setup projects. Unfortunately, web setup projects do not automatically configure the correct version of ASP.NET on your virtual directory. Therefore, after you have installed your web application on the target web server, you need to configure ASP.NET 2.0 for the virtual directory manually through the IIS management console and configure the ASP.NET 2.0 property page for the virtual directory as described in the section ASP.NET Side-by-Side Execution earlier in this chapter.

Figure 19-2. Requesting a web page that requires authentication When a user requests a secure web page that allows only specific users or users in specific roles, the process is similar, but an extra step takes place (see Figure 19-3): 1. The request is sent to the web server. Since the user identity is not known at this time, the user is asked to log in (using a custom web page or a browser-based login dialog box). The specific details of the login process depend on the type of authentication you re using. 2. The user provides their credentials, which are verified with the application. This is the authentication stage. 3. The authenticated user s credentials or roles are compared to the list of allowed users or roles. If the user is in the list, then they are granted access to the resource; otherwise, access is denied. 4. Users who have access denied are either prompted to log in again, or they are redirected to a web page with an access denied message.

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