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Although you could store this data in plain text and assume the web server won t be compromised, this is never a good idea Instead, you should use the encryption classes that are provided with NET to manually encrypt data before you store it It s worth noting that the NET encryption classes aren t directly tied to ASPNET In fact, you can use them in any type of NET application You ll learn about encryption and digital signatures as well as how to take control of custom encryption in 25..

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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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.

Before the ASP.NET runtime even gets in touch with an incoming request, IIS verifies the security according to its own configuration. Therefore, before you learn about the details of ASP .NET security, you have to learn about the first gatekeeper in the security pipeline of your web application IIS. IIS provides you with a couple of essential security mechanisms that act as gatekeepers before ASP .NET starts with the request processing. Basically, IIS includes the following security mechanisms: Authentication: IIS supports Basic authentication, Digest authentication, Passport authentication, and Windows authentication as well as certificate authentication through an SSL channel. Any authentication IIS performs results in an authenticated Windows user. Therefore, IIS supports authenticating Windows users only. Authorization: IIS provides built-in support of IP address restrictions and evaluation of Windows ACLs. Confidentiality: Encryption can be enforced through SSL. In the following sections, you will learn about the details of IIS security configuration. The other subsequent security chapters will go into the details of the ASP.NET security infrastructure. You have to keep IIS security always in mind, because it affects how ASP .NET behaves with different security settings applied in web.config. For example, if your ASP.NET application wants to use Windows authentication, you should configure IIS to use either Windows or Basic (or Digest) authentication. If your ASP.NET web application doesn t want to use Windows accounts (and therefore use custom or forms authentication), you must configure IIS to allow anonymous access.

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