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Dim result As Double = calc.Add(10, 20)
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Part VII:
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Advanced Topics
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Another thing you can do with IIS is use an encrypted HTTPS channel. This requires that you install a certificate on the server, as you would do to protect your Web site. Read the .NET Framework documentation for more information. Space constraints prevent me from describing advanced remoting techniques, such as asynchronous method invocation, events, custom formatters, and sinks. Suffice it to say that you can replace virtually every object in the .NET remoting architecture with your own custom classes and implement, for example, encrypted and compressed channels. Another reason for not covering remoting in too much detail is because Microsoft is going to abandon remoting in favor of the Web services infrastructure in the next ver sion of the .NET Framework, with the clear purpose of focusing its efforts on a single object remoting technology. For this reason, weigh your options very carefully when deciding about the remoting technology to use in your applications. An important aspect of all enterprise-level applications is security. Most developers love to forget about security until the application is about to go to production. Imple menting security in code is a notoriously tedious and difficult task. The .NET Framework doesn t make writing security code more fun, but at least it surely makes it easier, as you ll learn in the next chapter.
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33 Security
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As you remember from 1, the .NET Framework was built with security in mind. It implements a security model that integrates with Windows security and addresses the new types of security attacks that operating-system designers never had to worry about in the pre-Internet era. The portion of the .NET Framework that implements this new security model is called Code Access Security, or CAS for short.
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Note To keep the code as concise as possible, all the code samples in this section assume the use of the following Imports statements at the file or project level:
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Imports Imports Imports Imports Imports Imports Imports Imports System.Security System.Security.Permissions System.Security.Policy System.Security.Principal System.Security.Cryptography System.Reflection System.Threading System.IO
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Basic .NET Code Access Security Concepts
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As a developer and user, the odds are that you re already familiar with fundamental security concepts such as authentication, authorization, and Access Control Lists (ACLs). So I ll take these concepts for granted and focus exclusively on what .NET adds to the picture.
Looking at CAS in Action
For an example that illustrates what .NET security is all about, compile this simple console application to an executable file on your local disk:
Sub Main() Console.Write( Username: {0}", Environment.UserName) End Sub
Open a command prompt window and run the application to check that it correctly displays the name of the current user. Next, copy the executable to a network share on your LAN and attempt to run it. Instead of the expected result, you get an exception, as shown in Figure 33-1.
Part VII:
Advanced Topics
Figure 33-1 By default, an application that resides on a remote disk can t access local environment variables.
What happened The demo application internally reads an environment variable to return the current user s name, but this operation triggers a SecurityException if the code has been loaded from a location other than a local disk. It s worth noting that choosing a different location for the executable didn t change the Windows account under which the application runs because in each case it s the current user s account. What does change is that the .NET runtime detects that the assembly was launched from a location that s potentially insecure, and consequently the .NET runtime applies a different security policy. This introductory description highlights an important difference between traditional Windows security and the new .NET Code Access Security. The former is mainly con cerned with protecting the system from untrusted and potentially malicious users. It supports authentication and uses ACLs to protect vital resources. It doesn t, however, prevent legitimate users from unwittingly compromising the system by running unknown and potentially dangerous code. .NET CAS deals with code privileges rather than user privileges for example, managed code loaded from the Internet has restricted permissions and isn t able to harm your sys tem, even if you are the machine s administrator and the code runs under your identity. As a .NET developer, you need to be familiar with the basic concepts of CAS in order to resolve situations where .NET security will prevent your code from working cor rectly for example, when it has been loaded from the Internet. Component authors must be prepared to deal with potentially harmful client applications attempting to use their components to perform operations that would be otherwise prohibited. CAS is based on several concepts, and at first it is difficult to understand how they fit together. The best way to get started is to define some of the terms you re going to meet frequently in this chapter. Instead of describing these concepts in a purely abstract way, I ll show how they map to the elements of the .NET Configuration tool, which you reach from the Administrative Tools menu. (See Figure 33-2.)
33:
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