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Finally, you might want to use an authentication system that has nothing to do with Windows For example, an e-commerce application might verify user e-mail addresses against a server-side database In this case, the user s identity doesn t correspond to a Windows account In a few rare cases, you ll want to give your code the ability to temporarily assume the identity of the user This type of approach is much more common when creating ASPNET applications for local networks where users already have a carefully defined set of Windows privileges In this case, you need to supplement your security arsenal with impersonation, as described in 22..

PassportAuthenticationModule is active when the <authentication> element in the web.config file is set as follows: <authentication mode="Passport" /> The PassportAuthenticationModule module provides a wrapper for Microsoft s Passport authentication service. When using Passport, users are authenticated using the information in Microsoft s Passport database (the same technology that powers the free Hotmail e-mail system). The advantage of Passport is that you can use existing user credentials (such as an e-mail address and password), without forcing users to go through a separate registration process. The disadvantage is that you need to enter into a licensing agreement with Microsoft and pay a yearly fee based on use. ASP.NET doesn t include full support for Passport authentication. To use it successfully, you ll need to download and install the Passport .NET SDK on your web server. This book doesn t cover Passport, but you can learn more (and download the SDK) at http://www.microsoft.com/net/ services/passport.

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By right-clicking the root node in the folder view (called File System on Target Machine), you can add some special folders; one example of a special folder is a web custom folder, which is used for creating a virtual directory folder on the target machine s web server By default, Visual Studio will create one web custom folder (called Web Application Folder) when adding a web setup project to your solution You can edit the properties for the virtual directory by selecting the folder in the File System view and modifying the properties in the Visual Studio Properties window After you have defined the folder structure, you must add content to the folder Typically, you will add content from website projects or web deployment projects (as introduced in the section Visual Studio Web Deployment Projects earlier in this chapter) to a setup project.

Confidentiality means ensuring that data cannot be viewed by unauthorized users while being transmitted over a network or stored in a data store such as a database Integrity is all about ensuring that nobody can change the data while it is transmitted over a network or stored in a data store Both are based on encryption Encryption is the process of scrambling data so that it s unreadable by other users Encryption in ASP NET is a completely separate feature from authentication, authorization, and impersonation You can use it in combination with these features or on its own.

Once a user is authenticated, information such as the user s name and security context is automatically made available by the ASP.NET infrastructure. You can access this information through the HttpContext.Current.User object and use this information to implement authorization in your code. Furthermore, ASP .NET includes the following prebuilt modules for implementing authorization: UrlAuthorization: The UrlAuthorization module works based on the content of the <authorization> configuration in the web.config files of different directories of your web application. It can restrict access to both directories and files, based on the user s name or the roles assigned to the user. FileAuthorization: When using Windows authentication in intranets, ASP .NET automatically uses the FileAuthorization module for authorizing Windows users against files accessed by ASP.NET based on Windows Access Control Lists (ACLs). Therefore, each Windows user must have at least read access rights on the files of the web applications in that case. This module works with Windows authentication only but without impersonation. When impersonating users in Windows environments, you can even configure ACLs on registry entries or any other resource on the machine, and Windows does authorization based on the Windows user for you.

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