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finally { CodeAccessPermission.RevertAssert(); }
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Assert does have a few limitations. You can use Assert only once in a method. If you have to assert multiple permissions, you need to create a custom permission set (described later in this lesson). Second, Assert doesn t override the operating system s role-based security, regardless of the assembly s CAS permissions. If a user lacks permission to write to the D drive and runs an assembly with full trust that asserts that file permission, the Assert will succeed, but the assembly still can t write to the D drive. The assembly is still limited by the user s access restrictions.
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To prevent partially trusted code from bypassing security checks, partially trusted code can t call strong-named assemblies by default. You can control this on an assembly-by-assembly basis, however, by adding the AllowPartiallyTrustedCallersAttribute assembly-level custom attribute:
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[assembly:AllowPartiallyTrustedCallers]
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If your assembly doesn t have a strong name, partially trusted code can access your public methods even when you don t add that attribute.
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Permission sets are a collection of permissions that can be used imperatively in the same ways you use individual permissions. Use the System.Security.Permissions .PermissionSet class to create a permission set 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. For example, the following code creates a permission set consisting of read access to the C:\Windows folder, write access to the C:\Inetpub\ folder, and read access to the HKEY_LOCAL_MACHINE\Software registry key. Then it demands access to all those resources to cause the runtime to throw an exception if any of the specified permissions are not available.
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' VB Dim myPerms As PermissionSet = New PermissionSet(PermissionState.None) myPerms.AddPermission(New FileIOPermission _ (FileIOPermissionAccess.Read, "C:\Windows")) myPerms.AddPermission(New FileIOPermission _ (FileIOPermissionAccess.Write, "C:\Inetpub"))
Lesson 3: Using Declarative and Imperative Security to Protect Methods
myPerms.AddPermission(New _ RegistryPermission (RegistryPermissionAccess.Write, _ "HKEY_LOCAL_MACHINE")) myPerms.Demand // C# PermissionSet myPerms = new PermissionSet(PermissionState.None); myPerms.AddPermission(new FileIOPermission( FileIOPermissionAccess.Read, @"C:\Windows")); myPerms.AddPermission(new FileIOPermission( FileIOPermissionAccess.Write, @"C:\Inetpub")); myPerms.AddPermission(new RegistryPermission(RegistryPermissionAccess.Write, @"HKEY_LOCAL_MACHINE\Software")); myPerms.Demand();
You can call Assert only once in a method, so if you need to assert multiple permissions, you must use a permission set.
Lab: Protecting Methods with Code Access Security Demands
In this lab, you work with Deny and Assert methods to validate your understanding of both declarative and imperative CAS permissions. Complete Exercises 1 through 4. You will reset all policy levels and the end of Exercise 4.
Exercise 1: Experiment with the Default Permission Set
In this exercise, you experiment with declarative and imperative CAS demands and determine how each reacts when CAS is not restricted. To complete this exercise, you must have a folder named C:\Documents and Settings\Administrator\. If this folder is not present, create it prior to performing this exercise. 1. Copy either the C# or Visual Basic version of the 11\CASDemands folder from the companion CD to your hard disk, and open the project. Build the project and copy the resulting executable file to a folder on your computer that standard users (users who are not a member of the Administrators group) can access. 2. Log on to your computer as a standard user account and run the CASDemands.exe file. 3. In the Code Access Security Demands application, click the Create File With No Demand button and then answer the following questions: A. In which zone is the assembly running The assembly is using the My_Computer_Zone because it is being run from the computer s local file system.
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B. What permission set did the .NET Framework runtime grant the assembly By default, the My_Computer_Zone grants assemblies the FullTrust permission set. C. What type of exception was thrown, and why was that particular type of exception thrown The .NET Framework threw a System.UnauthorizedAccessException because the user, StandardUser, did not have access to create new files within the C:\Documents and Settings\Administrator\ folder. 4. In the Code Access Security Demands application, click the Create File With Declarative Demand button and then answer the following questions. A. What type of exception was thrown, and why was that particular type of exception thrown The .NET Framework threw a System.UnauthorizedAccessException because the user, StandardUser, did not have access to create new files within the C:\Documents and Settings\Administrator\ folder. B. Notice that the error message reads Failed When Attempting To Create File, not Failed Before Attempting To Create File. Use Visual Studio .NET to examine the declarativeDemandButton_Click method. This method calls the declarativeCreateFile method, which requires write access to a file that the user lacks permission to create. Why was the exception thrown within the createFile method, and not thrown when the declarative security demand was processed before the declarativeCreateFile method was run Declarative code access security demands will cause an exception to be thrown when the code itself lacks the required permission. In this case, the user lacks the required permission, but the code does have CAS permissions to create the file. Therefore, the declarative security demand is successful, but the more restricted role-based security requirement enforced by the operating system causes the .NET Framework runtime to throw an exception when the application attempts to create the file itself in the createFile method. 5. In the Code Access Security Demands application, click the Create File With Imperative Demand button and then answer the following question:
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