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23. Finally, use the .NET Framework Configuration Tool with administrative privileges to reset all policy levels, as described in Lesson 1 of this chapter.
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You can use six different methods to control permissions in an assembly: Assert, Demand, Deny, InheritanceDemand, LinkDemand, and PermitOnly. You should use PermitOnly and Deny within an assembly to reduce the likelihood of the assembly being misused by an attacker. Use Demand and LinkDemand only when accessing custom resources or unmanaged code. You can use Demand and LinkDemand to protect methods either declaratively or imperatively. You can use InheritanceDemand declaratively to restrict which assemblies can derive new classes from your own. You can use PermitOnly and Deny both declaratively and imperatively to restrict the permissions assigned to a method. To bypass CAS demands and enable underprivileged assemblies to call privileged methods, use Assert. Permission sets have the same capabilities as individual permissions, but apply a single action to multiple permissions simultaneously. To create a permission set, use the System.Security.Permissions.PermissionSet class and then use the AddPermission method to specify the permissions that define the permission set. Then you can call any standard permission methods, including Assert, Demand, Deny, and PermitOnly.
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You can use the following questions to test your knowledge of declarative and imperative method security. The questions are also available on the companion CD if you prefer to review them in electronic form.
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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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Lesson 3: Using Declarative and Imperative Security to Protect Methods
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1. Which of the following would you use within a method to throw an exception if the assembly lacked a specific privilege A. SecurityAction.Demand B. SecurityAction.Deny C. SecurityAction.Assert D. SecurityAction.RequestMinimum 2. Which of the following would you use to throw an exception before method execution begins if a caller lacked a specific privilege A. SecurityAction.Demand B. SecurityAction.Deny C. SecurityAction.Assert D. SecurityAction.RequestMinimum 3. You have created a FileIOPermission object named fp. Which method would you use to determine whether the current assembly had a specific permission without throwing an exception A. fp.Deny B. fp.IsGranted C. SecurityManager.Deny(fp) D. SecurityManager.IsGranted(fp) 4. Given the best answer, which of the following lines of code would reverse the security restriction (Choose all that apply.)
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' VB Dim e As EventLogPermission = _ New EventLogPermission (PermissionState.Unrestricted) e.PermitOnly // C# EventLogPermission e = new EventLogPermission(PermissionState.Unrestricted); e.PermitOnly();
A. e.RevertPermitOnly B. CodeAccessPermission.RevertPermitOnly C. e.RevertAll D. CodeAccessPermission.RevertAll E. e.RevertDeny F. CodeAccessPermission.RevertDeny
11 Review
Review
To further practice and reinforce the skills you learned in this chapter, you can perform the following tasks:
Review the chapter summary. Review the list of key terms introduced in this chapter. Complete the case scenarios. These scenarios set up real-world situations involving the topics of this chapter and ask you to create a solution. Complete the suggested practices. Take a practice test.
Summary
CAS controls managed code s access similarly to the way that operating system security restricts a user s access to system resources. You can configure CAS by using either the .NET Framework Configuration tool or the Caspol commandline tool. Assembly permission requests enable administrators to view the permission requirements of an assembly. They can also dramatically reduce the likelihood of an assembly being abused by ensuring that the assembly cannot access any system resources that it does not require. You can control CAS permissions within an assembly either imperatively or declaratively, allowing more granular control than can be accomplished with assembly declarations. This further increases the application s security.
Key Terms
Do you know what these key terms mean You can check your answers by looking up the terms in the glossary at the end of the book.
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