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<deny users=" " /> </authorization> </system.web> </configuration> The question mark ( ) is a wildcard character that matches all anonymous users. By including this rule in your web.config file, you specify that anonymous users are not allowed. Every user must be authenticated, and every user request will require the forms authentication ticket (which is a cookie). If you request a page in the application directory now, ASP.NET will detect that the request isn t authenticated and attempt to redirect the request to the login page (which will probably cause an error, unless you ve already created this page).

Furthermore, you can implement authorization by writing custom code in your pages or components used by the web application. In that case, you refer to the HttpContext.Current.User object and make decisions based on role membership or the user s name directly. You will learn more about how to design and implement authorization in 23. But before learning about the details of authentication and authorization, you must understand the meaning of the security context.

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) Never use string concatenation for creating SQL statements: Always use parameterized statements so that your application is not SQL injectable, as discussed in 7 Never output data entered by a user directly on your web page before validating and encoding it: The user might enter some HTML code fragments (for example, scripts) that lead to cross-site scripting vulnerabilities Therefore, always use HttpUtilityHtmlEncode() for escaping special characters such as < or > before outputting them on the page, or use a web control that performs this encoding automatically Never store sensitive data, business-critical data, or data that affects internal business rule decisions made by your application in hidden fields on your web page: Hidden fields can be changed easily by just viewing the source of the web page, modifying it, and saving it to a file.

Unlike the <authentication> element, the <authorization> element is not limited to the web.config file in the root of the web application. Instead, you can use it in any subdirectory, thereby allowing you to set different authorization settings for different groups of pages. You ll learn much more about authorization in 23.

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.

Then an attacker simply needs to submit the locally saved, modified web page to the server Browser plug-ins are available to make this approach as easy as writing an e-mail with Microsoft Outlook..

Next, you have to create a custom login page. This page collects a user name and password from the user and validates it against the credentials stored in the credential store. If credentials are stored in web.config, this is extremely easy; it s not much harder having credentials stored in any other store such as an external database. The login page you have to create must contain the parts shown in Figure 20-2. Furthermore, you must include the code for validating the credentials.

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