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Answer the following questions: A. PartiallyTrustedAssembly attempts to write to a file. Did it succeed No, it failed and reported a SecurityException because a request for FileIOPermission failed. B. Examine the source code and explain the behavior. PartiallyTrustedAssembly calls the TrustedClass.Distrust.WriteToFile method. This method uses the .NET Framework s StreamWriter object, which contains a demand for FileIOPermission. After the StreamWriter object issues the demand, the runtime checks each caller for the CAS permission. Because PartiallyTrustedAssembly lacks the permission, the runtime throws a SecurityException.
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Application Security
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10. Add a method to TrustedClass.Distrust named WriteToFileWrapper that uses Assert to block the FileIOPermission demand, rebuild the assembly, and copy it to C:\TrustedClass. 11. In the PartiallyTrustedAssembly solution, remove and re-add the TrustedClass reference. Then modify the PartiallyTrustedAssembly source code to call WriteToFileWrapper instead of WriteToFile. Answer the following questions:
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What code did you write to create the assembly The exact code will vary, but it should resemble the following:
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' VB Public Shared Sub WriteToFileWrapper(ByVal fileName As String, _ ByVal contents As String) ' Assert permission to allow caller to bypass security check Dim newFilePermission As FileIOPermission = _ New FileIOPermission(FileIOPermissionAccess.Write, fileName) newFilePermission.Assert() Try WriteToFile(fileName, contents) Finally ' Clean up the assertion CodeAccessPermission.RevertAssert() End Try End Sub // C# public static void WriteToFileWrapper(string fileName, string contents) { // Assert permission to allow caller to bypass security check FileIOPermission newFilePermission = new FileIOPermission(FileIOPermissionAccess.Write, fileName); newFilePermission.Assert(); try { WriteToFile(fileName, contents); } finally { // Clean up the assertion CodeAccessPermission.RevertAssert(); } }
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12. Rebuild the solution and then copy both the PartiallyTrustedAssembly.exe file and the TrustedClass.dll file to C:\PartiallyTrustedAssembly\. 13. At the command prompt, issue the following command:
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\\127.0.0.1\Untrusted\PartiallyTrustedAssembly
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Lesson 3: Using Declarative and Imperative Security to Protect Methods
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Answer the following question:
PartiallyTrustedAssembly attempts to write to a file. Did it succeed Why or why not No, it failed and reported a SecurityException because a request for SecurityPermission failed. The new method attempts to use an Assert, which is a security permission it lacks because of the permission set assigned to TrustedClass.
14. Now, you must increase the TrustedClass assembly s trust to enable it to use an Assert. However, before you can increase an assembly s trust, it must be signed. Therefore, in the TrustedClass solution, modify the project properties to sign the assembly. For detailed instructions, read How to: Sign a Visual Basic or Visual C# Assembly at http://msdn2.microsoft.com/en-us/library/ms180781.aspx. Then rebuild the assembly, and copy it to C:\TrustedClass\. 15. Launch the .NET Framework 2.0 Configuration tool. Click Runtime Security Policy, and then click Increase Assembly Trust in the right pane. 16. On the What Would You Like To Modify page, click Make Changes To This Computer and then click Next. 17. On the Which Assembly Do You Want To Trust page, type \\127.0.0.1\trusted\ trustedclass.dll and then click Next. 18. On the Trust This Assembly Or All Assemblies From This Publisher page, click This One Assembly. Click Next. 19. On the Choose The Minimum Level Of Trust For The Assembly page, move the slider to Full Trust. Click Next and then click Finish. 20. In the PartiallyTrustedAssembly solution, remove and readd the TrustedClass reference. Rebuild the solution and then copy both the PartiallyTrustedAssembly .exe file and the TrustedClass.dll file to C:\PartiallyTrustedAssembly\. 21. At the command prompt, issue the following command:
\\127.0.0.1\Untrusted\PartiallyTrustedAssembly
Answer the following question:
A. PartiallyTrustedAssembly attempts to write to a file. Did it succeed Why or why not Yes, it succeeded because the WriteToFileWrapper method includes an Assert that blocks the StreamWriter s inherent Demand from checking the permissions of PartiallyTrustedAssembly. Additionally, TrustedClass has sufficient trust to use the Assert.
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Application Security
22. Remove the shares you created by running the following commands at an Administrator command prompt:
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