c# print barcode zebra printer Lesson 1: Authenticating and Authorizing Users in VB.NET

Printer Quick Response Code in VB.NET Lesson 1: Authenticating and Authorizing Users

Lesson 1: Authenticating and Authorizing Users
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' Set the security policy context to Windows security System.AppDomain.CurrentDomain.SetPrincipalPolicy( _ PrincipalPolicy.WindowsPrincipal) End Sub // C# public Form1() { InitializeComponent(); // Set the security policy context to Windows security System.AppDomain.CurrentDomain.SetPrincipalPolicy( PrincipalPolicy.WindowsPrincipal); }
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4. Address the first requirement, Only members of the Users group can run the method linked to the Add button. The following code works for the addButton_Click method:
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' 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 an 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 an 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(); }
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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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5. Address the second requirement, Only members of the Administrators group can run the multiply method. Because the multiply method is not called directly by a Windows event, you can use declarative security. The following code declaration protects the multiply method:
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' VB <PrincipalPermission(SecurityAction.Demand, _ Role:="BUILTIN\Administrators")> _ // C# [PrincipalPermission(SecurityAction.Demand, Role = @"BUILTIN\Administrators")]
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6. Address the third requirement, Only the CPhilips user can run the method linked to the Divide button. The following code works for the divideButton_Click method:
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' VB ' Concatenate the computer and username Dim allowUser As String = System.Environment.MachineName + "\cphilips" Try ' Demand that user has the username "cphilips" on the local ' computer. Because this method is called by a Windows event, ' protect it with an 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 + @"\cphilips"; try { // Demand that user has the username "cphilips" on the local // computer. Because this method is called by a Windows event,
Lesson 1: Authenticating and Authorizing Users
// protect it with an 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(); } catch (System.Security.SecurityException ex) { // Display message box explaining access denial MessageBox.Show("You have been denied access: " + ex.Message); // TODO: Log error }
7. Address the fourth requirement, You must hide buttons to which users do not have access. You should do this in a method that runs when the form opens, such as the form constructor. The following code works:
' 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 CPhilips If Not (currentIdentity.Name.ToLower() = _ System.Environment.MachineName.ToLower() + "\cphilips") Then divideButton.Visible = False End If End Sub
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