c# print barcode font Using a credit card in .NET

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Using a credit card
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After you prove that you are the owner of the card, the credit card company must authorize the charge against your card. The acts of authorization and authentication are separate, because it s possible for you to be authenticated as the cardholder but be denied authorization for a particular charge. Cars have plates and stickers that signify they are properly inspected and registered, and are thus authorized to use public streets. In this case, there is authorization without authentication. Your office probably restricts who can enter. Most offices combine authentication and authorization into a single phase. If you have a proper ID card and can authenticate yourself, you are automatically authorized to enter the office.
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Opening a lock with a key
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Each time you open a lock, you prove that you are authorized to access the asset protected by that lock. Though the key is something you have, possessing the key is not a form of authentication because it does not necessarily prove who you are.
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Interacting with a pet
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Pets recognize you, which is a form of authentication. If they like you, they might let you pet or play with them, which is a form of authorization. If they recognize you but don t like you enough to let you pet them, you re authenticated but not authorized. Some pets don t require authentication or authorization for some actions, such as accepting food.
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Implementing Role-Based Security
3. Biometrics are not often used for authentication. Why do you think that is the case
Most experts agree that biometrics are not commonly used because people feel they are intrusive and the cost of the equipment is too high.
Practice: Authorizing Users with Windows Security
Page 5-17
Exercise
1. Write an application that meets the technical requirements, and show your work.
Although your answer will vary, the following code will work:
using System;
using System.Security.Principal;
namespace CheckDeveloperRights { /// <summary> /// Determines whether the current user has appropriate developer rights. /// </summary> class Class1 { [STAThread]
static void Main(string[] args)
// Create a WindowsIdentity object representing the current user WindowsIdentity currentIdentity = WindowsIdentity.GetCurrent(); // Create a WindowsPrincipal object representing the current user WindowsPrincipal currentPrincipal = new WindowsPrincipal(currentIdentity); bool userCanDevelop = true; // Store the computer name to construct local group names string computerName = System.Environment.MachineName; if (currentPrincipal.IsInRole(WindowsBuiltInRole.Administrator) || currentPrincipal.IsInRole(WindowsBuiltInRole.PowerUser)) { Console.WriteLine ( User is a member of Administrators or Power Users. ); Console.WriteLine ( Remove the user from these groups before beginning development. ); userCanDevelop = false; } if (!(currentPrincipal.IsInRole(computerName + @"\VS Developers ) && currentPrincipal.IsInRole(computerName + @"\Debugger Users ) && currentPrincipal.IsInRole(WindowsBuiltInRole.User))) { Console.WriteLine( User lacks appropriate memberships. ); Console.WriteLine( Users should be a member of VS Developers, Debugger Users, and Users. );
userCanDevelop = false;
Questions and Answers
if (userCanDevelop) { Console.WriteLine ( Group memberships verified. Proceed with development. ); } } } }
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Imports System.Security.Principal Module Module1 Sub Main() 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) Dim userCanDevelop As Boolean = True Store the computer name to construct local group names Dim computerName As String = System.Environment.MachineName If (currentPrincipal.IsInRole(WindowsBuiltInRole.Administrator) Or currentPrincipal.IsInRole(WindowsBuiltInRole.PowerUser)) Then Console.WriteLine ( User is a member of Administrators or Power Users. ) Console.WriteLine ( Remove the user from these groups before beginning development. ) userCanDevelop = False End If If (Not (currentPrincipal.IsInRole(computerName + \VS Developers ) And currentPrincipal.IsInRole(computerName + \Debugger Users ) And currentPrincipal.IsInRole(WindowsBuiltInRole.User))) Then Console.WriteLine( User lacks appropriate memberships. ) Console.WriteLine ( Users should be a member of VS Developers, Debugger Users, and Users. ) userCanDevelop = False End If If (userCanDevelop) Then Console.WriteLine ( Group memberships verified. Proceed with development. ) End If End Sub End Module
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5
Implementing Role-Based Security
Practice: Selecting and Implementing RBS
Page 5-27
Exercise 1: Identifying the Proper RBS Technique
1. You must restrict access to a method based on a user s group memberships. You want to use the most secure method possible. Which technique will you use Choose the correct answer. a. WindowsPrincipal.IsInRole b. Imperative RBS demands c. Declarative RBS demands
The answer is c. Declarative RBS demands restrict access to an entire method, while offering the highest level of resistance to security vulnerabilities.
2. You must restrict access to a method that is called by a Windows event based on a user s group memberships. If the user lacks sufficient access, you want to log an event and display a message to the user. You want to use the most secure method possible. Which technique will you use Choose the correct answer. a. WindowsPrincipal.IsInRole b. Imperative RBS demands c. Declarative RBS demands
The answer is b. Imperative RBS demands restrict access to code by throwing an exception. Unfortunately, declarative RBS demands are defined as an attribute to a method, and it is difficult to catch security exceptions thrown by a declarative RBS demand when the method is called by a Windows event.
3. You are writing a method for a console application that lists options available to a user based on his group memberships. Which technique should you use Choose the correct answer. a. WindowsPrincipal.IsInRole b. Imperative RBS demands c. Declarative RBS demands
The answer is a. WindowsPrincipal.IsInRole is perfect when you simply need to branch your code based on user memberships and the code is not performing security-sensitive tasks.
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