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CHAPTER 2 s FRAMEWORK DESIGN
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file setting. The ability to change between different physical configurations with no changes to code is a powerful, valuable feature.
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Application security is often a challenging issue. Applications need to be able to authenticate the user, which means that they need to verify the user s identity. The result of authentication is not only that the application knows the identity of the user, but that the application has access to the user s role membership and possibly other information about the user collectively, I ll refer to this as the user s profile data. This profile data can be used by the application for various purposes, most notably authorization. The framework directly supports integrated security. This means that you can use objects within the framework to determine the user s Windows identity and any domain or Active Directory (AD) groups to which they belong. In some organizations, this is enough: all the users of the organization s applications are in the Windows NT domain or AD, and by having them log in to a workstation or a website using integrated security, the applications can determine the user s identity and roles (groups). In other organizations, applications are used by at least some users who are not part of the organization s NT domain or AD. They may not even be members of the organization in question. This is very often the case with web and mobile applications, but it s surprisingly common with Windows applications as well. In these cases, you can t rely on Windows integrated security for authentication and authorization. To complicate matters further, the ideal security model would provide user profile and role information not only to server-side code, but also to the code on the client. Rather than allowing the user to attempt to perform operations that will generate errors due to security at some later time, the UI should gray out the options, or not display them at all. This requires that the developer have consistent access to the user s identity and profile at all layers of the application, including the UI, Business Logic, and Data Access layers. Remember that the layers of an application may be deployed across multiple physical tiers. Due to this fact, there must be a way of transferring the user s identity information across tier boundaries. This is often called impersonation. Implementing impersonation isn t too hard when using Windows integrated security, but it s often problematic when relying solely on, say, COM+ role-based security, because there s no easy way to make the user s COM+ role information available to the UI developer.
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s Note
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In May 2002, Juval Lowy wrote an article for MSDN magazine in which he described how to create custom .NET security objects that merge NT domain or AD groups and COM+ roles so that both are available to the application.2
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The business framework will provide support for both Windows integrated security and custom authentication, in which you define how the user s credentials are validated and the user s profile data and roles are loaded. This custom security is a model that you can adapt to use any existing security tables or services that already exist in your organization. The framework will rely on Windows itself to handle impersonation when using Windows integrated or AD security, and will handle impersonation itself when using custom authentication.
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2. Juval Lowy, Unify the Role-Based Security Models for Enterprise and Application Domains with .NET (MSDN, May 2002). See http://msdn.microsoft.com/msdnmag/issues/02/05/rolesec.
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Applications also need to be able to authorize the user to perform (or not perform) certain operations, or view (or not view) certain data. Such authorization is typically handled by associating users with roles, and then indicating which roles are allowed or disallowed for specific behaviors.
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