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You should always strive to design the security in your application keeping the preceding two principles in mind. With these principles in mind, let s now turn our attention to the important design question related to security in an application: How do we map an application end user to a database user In the next section, we ll discuss how this issue can be addressed, especially in the context of a web application.

The ScriptManagerProxy control is available as an additional script manager for a page. It also allows for custom authentication services through its AuthenticationService property and profile services through the ProfileServiceManager property. Because only one ScriptManager control is allowed per ASP.NET page, if you use master and content pages, you cannot place additional ScriptManager controls on any of the content pages. The ScriptManagerProxy control enables you to place scripts and/or services in your content pages. Before delving deeper into this control, let s also look at the properties for the supported child tags of this control in Table 5-4.

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An end user ultimately has to connect to the database as some database user to perform operations This section explores the various alternatives of providing this mapping between the application end user and database end user, and examines the design implications of each alternative For the discussion in this section, assume that we re designing an HR application that has the following two categories (or roles) of end users: clerk_role: This user can generate reports and query data manager_role: This user has the privileges of clerk_role and can also add, update, and delete data Also assume that there are 100 clerk end users (clerk1, clerk2, etc, up to clerk100) and 10 manager end users (manager1, manager2, etc, up to manager10).

We have three choices while mapping each of these end users to database users: One-to-one mapping: The one-to-one mapping implies that you create a database user account for each application user In our example, this means that we would create 100 clerk user accounts (db_clerk1, db_clerk2, etc) and 10 manager user accounts (db_manager1, db_ manager2, etc) We could, of course, have the same username for the application user and the corresponding database user we ll choose to prefix the database user with db_ to distinguish between the users in this discussion The one-to-one mapping design has the following implications: Since each end user is connecting as a separate database user, the user s identity is preserved in the database This simply means we can trace a given action conducted by a database user back to a single end user (assuming we have proper auditing in place).

This is a good thing from a security point of view In the case of a client/server application, the end user can simply present to the application the database user s password to log onto the application In a web application with a three-tier architecture, this can result in some password management issues We will examine these issues in more detail in the section Authenticating an Application End User to the Database If we re using one-to-one mapping in conjunction with connection pooling, then this design can result in performance problems Here we assume that our connection pool consists of dedicated connection for each database user Since each connection can be used by only one user, every time a new user logs in, we need to create a new connection for the user (since none of the existing connections in the pool can be reused by this user).

Returns the AuthenticationServiceManager object (for custom authentication service) that is associated with the current ScriptManagerProxy instance Returns the ProfileServiceManager object that is associated with the current ScriptManagerProxy instance Returns a ScriptReferenceCollection object that contains a ScriptReference object for each script file that is registered with the ScriptManagerProxy control Returns a ServiceReferenceCollection object that contains a ServiceReference object for each service that is registered with the ScriptManagerProxy control

Later in the section Proxy Authentication (N-Tier Authentication) we ll cover how this problem can be overcome even within the realm of one-to-one mapping..

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