qr code generator asp net c# Lesson 1: Understanding Code Access Security in C#.NET

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Lesson 1: Understanding Code Access Security
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9. Open a command prompt, and run the command \\127.0.0.1\c$\ListPermissions.exe. Notice that ListPermission now has the IsolatedStorageFilePermission. Press Enter. Answer the following question:
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Why does the assembly now have IsolatedStorageFilePermission The assembly is currently running in both the Local_Shared_Folder code group and the Internet_Same_Site_Access code group. The permissions in the GenerousPermissions permission set have been added to the previously existing permissions.
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Exercise 3: Modify a Code Group with the Caspol Tool and Restore Default Settings
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In this exercise, you modify the newly created code group with the Caspol tool, test the change, and then restore the default settings. 1. Open the Visual Studio 2005 Command Prompt, and run the following command to change the Local_Shared_Folder code group permission set to Everything:
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Caspol -chggroup Local_Shared_Folder Everything
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2. When prompted, press Y and then press Enter. 3. Run \\127.0.0.1\c$\Listpermissions. Notice that the assembly now has all permissions, indicating that the Local_Shared_Folder code group now has the Everything permission set. 4. Restore the default CAS settings by running the command Caspol recover.
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Lesson Summary
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CAS is a security system that authorizes managed assemblies to access system resources. CAS is implemented by using the following four components:
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Evidence, which identifies an assembly Permissions, which describe which resources an assembly can access Permission sets, which collect multiple permissions Code groups, which assign permissions to an assembly based on evidence
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A security policy is a logical grouping of code groups and permission sets. You can use multiple levels of security policy to simplify CAS administration. Assemblies receive the most restrictive set of permissions assigned by each of the policy levels.
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Application Security
CAS permissions can never override a user s operating system permissions. An assembly s effective permissions are the intersection of the permissions granted to the assembly by CAS and to the user by the operating system. The .NET Framework Configuration tool is a graphical tool to configure any aspect of CAS. To use the tool, launch the Microsoft .NET Framework Configuration from the Administrative Tools group. The Code Access Security Policy tool, Caspol, is a command-line tool with a large number of options for controlling almost every aspect of CAS behavior. To use Caspol, call it from the directory the .NET Framework is installed into.
Lesson Review
You can use the following questions to test your knowledge of general CAS information. The questions are also available on the companion CD if you prefer to review them in electronic form.
NOTE Answers
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.
1. Which of the following evidence types require an assembly to be signed (Choose all that apply.) A. Zone B. Strong Name C. Hash D. Publisher 2. Which permission must an assembly have to connect to a Web server A. SocketPermission B. WebPermission C. DnsPermission D. ServiceControllerPermission
Lesson 1: Understanding Code Access Security
3. Which of the following code groups offers the most restrictive permission set A. My_Computer_Zone B. LocalIntranet_Zone C. Internet_Zone D. Restricted_Zone 4. Your user account has Read access to a file named text.txt. You run an assembly in the My_Computer_Zone code group, which grants it the FullTrust permission set. Which of the following actions can the assembly perform on the file A. Read B. Write C. Change permissions D. Delete
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Application Security
Lesson 2: Using Declarative Security to Protect Assemblies
In Lesson 1 you learned that CAS can restrict permissions granted to an application. So you must plan to have your application run in a partially trusted security context. In some situations, CAS security is so restrictive that your application won t have the permissions required for even the most basic functionality, and the runtime should detect this problem and prevent your assembly from running. In other situations, your application will have more permissions than necessary, which violates the principle of least privilege and makes your application unnecessarily vulnerable to abuse. You can use declarative CAS demands to ensure your assembly has all necessary permissions but none that it does not require. As an additional benefit, administrators deploying your application can examine the assembly s declarative CAS demands to identify the minimum permissions they need to grant to take advantage of all your application s functionality.
After this lesson, you will be able to:
Describe why you should use CAS assembly declarations. List the classes built into the .NET Framework for CAS permissions. List the three types of CAS assembly declarations. Create CAS assembly declarations. Explain the guidelines for effectively implementing CAS assembly declarations.
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