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User and Data Security
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catch (System.Security.SecurityException ex) { // Display message box explaining access denial MessageBox.Show("You have been denied access: " + ex.Message); // TODO: Log error }
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Address the fourth requirement, You must hide buttons users do not have access to. You should do this in a method that will run when the form opens, such as the form constructor. The following code would work:
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' VB Public Sub New() MyBase.New() InitializeComponent() ' Create a WindowsIdentity object representing the current user Dim currentIdentity As WindowsIdentity = WindowsIdentity.GetCurrent() ' Create a WindowsPrincipal object representing the current user Dim currentPrincipal As WindowsPrincipal = _ New WindowsPrincipal(currentIdentity) ' Set the security policy context to Windows security System.AppDomain.CurrentDomain.SetPrincipalPolicy( _ PrincipalPolicy.WindowsPrincipal) ' Hide the subtract and multiply buttons if the user ' is not an Administrator If Not currentPrincipal.IsInRole(WindowsBuiltInRole.Administrator) Then subtractButton.Visible = False multiplyButton.Visible = False End If ' Hide the Add button if the user is not in the Users group If Not currentPrincipal.IsInRole(WindowsBuiltInRole.User) Then addButton.Visible = False End If ' Hide the Divide button if the user is not named CPhilp If Not (currentIdentity.Name.ToLower() = _ System.Environment.MachineName.ToLower() + "\cphilp") Then divideButton.Visible = False End If End Sub // C# public Form1() { InitializeComponent(); // Create a WindowsIdentity object representing the current user WindowsIdentity currentIdentity = WindowsIdentity.GetCurrent();
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Lesson 1: Authenticating and Authorizing Users
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// Create a WindowsPrincipal object representing the current user WindowsPrincipal currentPrincipal = new WindowsPrincipal(currentIdentity); // Set the security policy context to Windows security System.AppDomain.CurrentDomain.SetPrincipalPolicy( PrincipalPolicy.WindowsPrincipal); // Hide the subtract and multiply buttons if the user // is not an Administrator if (!currentPrincipal.IsInRole(WindowsBuiltInRole.Administrator)) { subtractButton.Visible = false; multiplyButton.Visible = false; } // Hide the Add button if the user is not in the Users group if (!currentPrincipal.IsInRole(WindowsBuiltInRole.User)) addButton.Visible = false; // Hide the Divide button if the user is not named CPhilp if (!(currentIdentity.Name.ToLower() == System.Environment.MachineName.ToLower() + @"\cphilp")) divideButton.Visible = false; }
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8. Build and run your project. Test it when running with different user accounts, including a user account named Cphilp, a user account that is a member of the Administrators group, and a user account that is only a member of the Users group.
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Authentication, such as checking your photo identification, verifies your identity by requiring you to provide unique credentials that are not easily impersonated. Authorization, such as checking your plane ticket, verifies that you have permission to perform the action you are attempting. Authentication, determining who you are, must happen before authorization, which determines whether you are allowed to access a resource. The WindowsIdentity class provides .NET Framework applications access to a Windows user s account properties. You can examine the current user s user name and authentication type by creating a new WindowsIdentity object by using the WindowsIdentity.GetCurrent method. The WindowsPrincipal class enables assemblies to query the Windows security database to determine whether a user is a member of a particular group. To examine the current user s group memberships, create a WindowsPrincipal object by using the current user s identity and then call the WindowsPrincipal.IsInRole method.
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12
User and Data Security
You use the PrincipalPermission class to specify user name, role, and authentication requirements. Declarative RBS demands restrict access to an entire method by throwing an exception if the current principal does not meet the specified access requirements. Use declarative RBS demands by setting the principal policy, creating a try/catch block to handle users with insufficient privileges, and declaring a PrincipalPermission attribute to declare the method s access requirements. Use imperative RBS demands by setting the principal policy, creating a try/catch block to handle users with insufficient privileges, creating a PrincipalPermission object to declare the method s access requirements, and then calling the PrincipalPermission.Demand method. Use the WindowsPrincipal.IsInRole method to make decisions based on group memberships. Declarative RBS demands are perfect for situations in which your application calls a method directly, and access to the entire method must be restricted. Use imperative RBS demands when you need to protect only a portion of a method or when you are protecting a method that can be called by a Windows event. To create a custom identity and principal classes, extend the IIdentity and IPrincipal interfaces by overriding the existing properties and adding your custom methods and properties. To create simple custom user models, use the GenericIdentity and GenericPrincipal classes instead of the IIdentity and IPrincipal interfaces. To create declarative and imperative RBS demands with a custom identities and principals, set the Thread.CurrentPrincipal property to your custom principal. If you are establishing an SslStream connection, you should catch different types of exceptions. If you catch an AuthenticationException, you should prompt the user for different credentials. If you catch an InvalidCredentialException, some aspect of the stream is corrupted, and you cannot retry authentication.
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