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NOTE
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Answers
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Answers to these questions and explanations of why each answer choice is right or wrong are located in the Answers section at the end of the book.
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1. You must restrict access to a method based on a user s group memberships in the local user database. You want to use the most secure method possible. Which technique will you use A. WindowsPrincipal.IsInRole B. WindowsIdentity.IsInRole C. Imperative RBS demands D. Declarative RBS demands 2. You must restrict access to a method that is called by a Windows event based on a user s group memberships in the local user database. If the user lacks sufficient access, you want to log an event and display a message to the user. You want to use the most secure method possible. Which technique will you use A. WindowsPrincipal.IsInRole B. WindowsIdentity.IsInRole C. Imperative RBS demands D. Declarative RBS demands 3. You are writing a method for a Console application that lists options available to a user based on the user s group memberships. Which technique should you use A. WindowsPrincipal.IsInRole B. WindowsIdentity.IsInRole C. Imperative RBS demands D. Declarative RBS demands 4. You are creating a front-end interface to a back-end database that stores usernames and groups within the database itself. The user database is very simple, storing only usernames and group memberships. You want to be able to use
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Lesson 1: Authenticating and Authorizing Users
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imperative and declarative RBS demands within your application based on the custom user database. Which of the following classes meets your requirements and would be most efficient to implement (Choose all that apply.) A. GenericIdentity B. GenericPrincipal C. IIdentity D. IPrincipal
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12
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User and Data Security
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Lesson 2: Using Access Control Lists
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In Lesson 1, you learned how to use permission demands to restrict access to portions of your code to specific users. Operating systems use access control lists (ACLs) to provide similar functionality. ACLs are the most common technique for restricting access to files, folders, printers, services, registry values, and just about every other operating system resource. As a developer, you must understand ACLs for two important reasons: You can configure them to restrict access to sensitive files, folders, and other objects used by your application. You can configure them to allow users to access files and other objects that the users are not typically allowed to access but that the application needs to access. In this lesson, you learn the fundamentals of ACLs and how to analyze and configure them from within your application.
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After this lesson, you will be able to: Explain the purpose of a discretionary ACL and describe how Windows calculates effective permissions Explain the purpose of a security ACL View and configure ACLs using the System.Security.AccessControl namespace Estimated lesson time: 30 minutes
What Is a Discretionary Access Control List
A discretionary access control list (DACL) is an authorization restriction mechanism that identifies the users and groups that are allowed or denied access to an object. Windows Vista and Windows Server 2008, like all recent members of the Windows family, keep track of the privileges that users have for accessing resources by using a DACL. If a DACL does not identify explicitly a user or any groups that a user is a member of, the user is denied access to that object. By default, a DACL is controlled by the owner of an object or the person who created the object, and it contains access control entries (ACEs) that determine user access to the object. An ACE is an entry in an object s DACL that grants permissions to a user or group.
Explicit and Inherited Permissions
When you assign a DACL directly to an object, you create an explicit permission. Assigning explicit permissions to every individual folder, file, registry value, and AD DS object would be a ponderous task. In fact, managing the massive number of
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