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Handling Authentication Exceptions in Streams
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When authenticating to remote computers using the System.Net.Security.NegotiateStream or System.Net.Security.SslStream classes, the .NET Framework will throw an exception if either the client or server cannot be properly authenticated. Therefore, you should always be prepared to catch one of the following exceptions when using NegotiateStream or SslStream:
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System.Security.Authentication.AuthenticationException
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An exception of this type indicates that you should prompt the user for different credentials and retry authentication.
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Lesson 1: Authenticating and Authorizing Users
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System.Security.Authentication.InvalidCredentialException
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An exception of this type indicates that the underlying stream is not in a valid state, and you cannot retry authentication.
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Lab: Adding Role-Based Security to an Application
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In this lab, you add security to an application so that features are limited based on the user s name and group membership. If you encounter a problem completing an exercise, the completed projects are available on the companion CD in the Code folder.
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Exercise: Protect an Application with Role-Based Security
In this exercise, you update a Windows Forms calculator application to include RBS. You should use the most secure techniques possible and meet the following requirements:
Only members of the Users group can run the method linked to the Add button. Only members of the Administrators group can run the multiply method. Only the CPhilp user can run the method linked to the Divide button. You must hide buttons users do not have access to.
1. Use Windows Explorer to copy either the C# or Visual Basic version of the 12\Lesson1-Exercise1 folder from the companion CD to your My Documents\Visual Studio Projects\ folder. Then open the solution. 2. Add the System.Security.Permissions and System.Security.Principal namespaces to your code. 3. To enable you to check Windows group memberships, set the principal policy to Windows Policy. You should do this in a method that will run when the form opens, such as the form constructor. The following code would work:
' VB Public Sub New() MyBase.New() InitializeComponent() ' Set the security policy context to Windows security System.AppDomain.CurrentDomain.SetPrincipalPolicy( _ PrincipalPolicy.WindowsPrincipal) End Sub // C# public Form1() { InitializeComponent();
12
User and Data Security
// Set the security policy context to Windows security System.AppDomain.CurrentDomain.SetPrincipalPolicy( PrincipalPolicy.WindowsPrincipal); }
4. Address the first requirement, Only members of the Users group can run the method linked to the Add button. The following code would work for the addButton_Click method:
' VB Try ' Demand that user is member of the built-in Users group ' Because this method is called by a Windows event, protect it ' with a imperative RBS demand Dim userPermission As PrincipalPermission = _ New PrincipalPermission(Nothing, "BUILTIN\Users") userPermission.Demand() ' Perform calculations Dim answer As Integer = (Integer.Parse(integer1.Text) + _ Integer.Parse(integer2.Text)) answerLabel.Text = answer.ToString() Catch ex As System.Security.SecurityException ' Display message box explaining access denial MessageBox.Show("You have been denied access: " + ex.Message) ' TODO: Log error End Try // C# try { // Demand that user is member of the built-in Users group // Because this method is called by a Windows event, protect it with // a imperative RBS demand PrincipalPermission userPermission = new PrincipalPermission(null, @"BUILTIN\Users"); userPermission.Demand(); // Perform the calculation int answer = (int.Parse(integer1.Text) + int.Parse(integer2.Text)); answerLabel.Text = answer.ToString(); } catch (System.Security.SecurityException ex) { // Display message box explaining access denial MessageBox.Show("You have been denied access: " + ex.Message); // TODO: Log error }
5. Address the second requirement, Only members of the Administrators group can run the multiply method. Because the multiply method is not directly called
Lesson 1: Authenticating and Authorizing Users
by a Windows event, you can use declarative security. The following code declaration would protect the multiply method:
' VB <PrincipalPermission(SecurityAction.Demand, _ Role:="BUILTIN\Administrators")> _ // C# [PrincipalPermission(SecurityAction.Demand, Role = @"BUILTIN\Administrators")]
6. Address the third requirement, Only the CPhilp user can run the method linked to the Divide button. The following code would work for the divideButton_Click method:
' VB ' Concatenate the computer and username Dim allowUser As String = System.Environment.MachineName + "\cphilp" Try ' Demand that user has the username "cphilp" on the local ' computer. Because this method is called by a Windows event, ' protect it with a imperative RBS demand Dim p As PrincipalPermission = _ New PrincipalPermission(allowUser, Nothing) p.Demand() ' Perform super-secret mathematical calculations Dim answer As Decimal = (Decimal.Parse(integer1.Text) _ / Decimal.Parse(integer2.Text)) answerLabel.Text = Decimal.Round(answer, 2).ToString() Catch ex As System.Security.SecurityException ' Display message box explaining access denial MessageBox.Show("You have been denied access: " + ex.Message) ' TODO: Log error End Try // C# // Concatenate the computer and username string allowUser = System.Environment.MachineName + @"\cphilp"; try { // Demand that user has the username "cphilp" on the local // computer. Because this method is called by a Windows event, // protect it with a imperative RBS demand PrincipalPermission p = new PrincipalPermission(allowUser, null); p.Demand(); // Perform super-secret mathematical calculations Decimal answer = (Decimal.Parse(integer1.Text) / Decimal.Parse(integer2.Text)); answerLabel.Text = Decimal.Round(answer, 2).ToString(); }
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