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The .NET Framework supports both imperative and declarative RBS demands. The class PrincipalPermission provides support for imperative security statements, and its attribute counterpart PrincipalPermissionAttribute provides support for declarative security statements. RBS demands use the same syntax as CAS demands, but RBS demands specify the name the current user must have, or more commonly, the roles of which the user must be a member. An RBS demand instructs the runtime to look at the name and roles of the current user, and if that user does not meet the requirements of the demand, the runtime throws a System.Security.SecurityException exception. To make an imperative security demand, you must first create a PrincipalPermission object specifying the username and role name you want to demand, and then you must call its Demand method. You can specify only a single username and role name per demand. If either the username or the role name is null, any value will satisfy the demand. Unlike with code access permissions, an RBS demand does not result in a stack walk; the runtime evaluates only the username and roles of the current user. To make a declarative security demand, you must annotate the class or member you want to protect with a correctly configured PrincipalPermissionAttribute attribute. Class-level demands apply to all members of the class, unless a member-specific demand overrides the class demand.

Unlike Java and its handling of arrays, JavaFX Script allows sequences to be used as function parameters. When a sequence is sent as a parameter to a function, its elements are read-only, like any other parameter to the function. That is, trying to change the elements of the sequence, inserting and deleting them dynamically, will result in a compile-time error. A script-level, package-level sequence can be accessed by any function. Sequences defined within a function, by contrast, cannot be accessed outside the function. The example in Listing 10-13 demonstrates the implementation of a stack using a sequence; the sequence is passed as a parameter to the function. Listing 10-13. Implementing a stack using a sequence, by passing the sequence as a parameter to the function 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. var stack: Integer[]; function push(value : Integer){ insert value into stack; } function pop( ) { if(sizeof stack == 0 ){ println("Stack underflow"); }else { delete stack[sizeof stack -1]; } }

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Generally, you are free to choose whether to implement imperative or declarative demands However, imperative security demands allow you to integrate RBS demands with code logic to achieve more sophisticated demand behavior In addition, if you do not know the role or usernames to demand at compile time, you must use imperative demands Declarative demands have the advantage that they are separate from code logic and easier to identify In addition, you can view declarative demands using the Permviewexe tool (discussed in recipe 11-6) Whether you implement imperative or declarative demands, you must ensure that the runtime has access to the name and roles for the current user to evaluate the demand correctly The SystemThreadingThread class represents an operating system thread running managed code The static property CurrentPrincipal of the Thread class contains an IPrincipal instance representing the user on whose behalf the managed thread is running.

Figure 10-80. Page Editor asks you to confirm that you really want to delete a page. 3. If you ve made up your mind to do away with the page, click OK. Office Live deletes the page and returns you to Page Manager. The page you just deleted will no longer appear in the list in Page Manager.

At the operating system level, each thread also has an associated Windows access token, which represents the Windows account on whose behalf the thread is running The IPrincipal instance and the Windows access token are two separate entities Windows uses its access token to enforce operating system security, whereas the NET runtime uses its IPrincipal instance to evaluate application-level RBS demands Although they may, and often do, represent the same user, this is by no means always the case The benefit of this approach is that you can implement a user and an RBS model within your application using a proprietary user accounts database, without the need for all users to have Windows user accounts This is a particularly useful approach in large-scale, publicly accessible Internet applications By default, the ThreadCurrentPrincipal property is undefined.

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