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Before You Begin
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Before You Begin
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To complete the lessons in this chapter, you should be familiar with Microsoft Visual Basic or C# and be comfortable with the following tasks:
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Create a console application in Microsoft Visual Studio using Visual Basic or C# Write to files and streams Manage user accounts with the graphical tools built into Microsoft Windows Manage file permissions with the graphical tools built into Windows
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12
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User and Data Security
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Lesson 1: Authenticating and Authorizing Users
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In this lesson, you will learn the meaning of the term authentication and how it differs from authorization. You will then learn how to implement and analyze both authentication (checking a user s identity) and authorization (verifying a user s right to access resources). You can use the techniques described in this lesson to protect portions of your code from unauthorized use, so that only specific users or members of specific groups can run an assembly, method, or code segment. If your organization uses Active Directory or local user databases, you can integrate your application s authorization controls into your existing directory service using the WindowsIdentity and WindowsPrincipal classes. You can also build your own authentication system or integrate into a non-Microsoft directory service. For straightforward user databases, you can use the GenericIdentity and GenericPrincipal classes. If you need complete control over users and roles, you can implement the IIdentity and IPrincipal interfaces.
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After this lesson, you will be able to:
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Explain how authorization relates to authentication. Use the WindowsIdentity class to examine a user s name and authentication type to make decisions within your application. Explain the purpose of the WindowsPrincipal class. Describe the purpose of the PrincipalPermission class. Use declarative RBS demands to restrict access to methods. Use imperative RBS demands to create applications that restrict access to portions of your application s logic. Create custom identity classes by using the IIdentity interface, the IPrincipal interface, the GenericIdentity class, and the GenericPrincipal class. Describe the different circumstances in which the runtime uses AuthenticationException and InvalidCredentialException.
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Estimated lesson time: 90 minutes
Authentication and Authorization Overview
Authentication is the process of identifying a user and is the most visible and fundamental concept in security. From personal identification numbers (PINs) to driver s licenses to user names and passwords, authentication is a part of everyone s daily life.
Lesson 1: Authenticating and Authorizing Users
Without authentication, restricting access to resources based on a person s identity would be impossible. Authorization is the process of verifying that a user is allowed to access a requested resource. Authorization generally happens only after authentication. After all, how can you determine whether someone is allowed to do something if you don t yet know who they are Figure 12-1 shows how authentication and authorization together provide a user s identity and validate the user s permissions.
Yes, you really are John Authentication
Authentication Server
John is allowed to open this folder.
Authorization
Resource
Figure 12-1
To access a resource, a user must be authenticated and then authorized
Whether you re withdrawing money from a bank, entering a restricted building, or boarding an airplane, gaining access to a restricted resource requires both authentication and authorization. The two processes are closely related and often confused. To understand the difference between authentication and authorization, consider an example in the physical world that most people are familiar with: boarding an airplane. Before you can board a plane, you must present both your identification and your ticket. Your identification, typically a driver s license or a passport, enables the airport staff to determine who you are. Validating your identity is the authentication part of the boarding process. The airport staff also checks your ticket to make sure that the flight you are boarding is the correct one. Verifying that you are allowed to board the plane is the authorization process. On networks, authentication is often performed by providing a user name and password. The user name identifies you, and the password offers the computer system some assurance that you really are who you claim to be. After you are authenticated,
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