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Now that we have covered a number of key security concepts, let us examine how those concepts work together in a typical web client/web server interaction. Suppose Alice is an employee of a company called PCs-R-Us, and her job responsibility is to order DVD drives for the company s PCs from a company called DVD-Factory. DVD-Factory has a web site that Alice uses to procure DVDs for her company. The following points examine why DVD-Factory might want to care about the security goals discussed in this chapter when implementing its web site. Authentication: If a malicious competitor is trying to steal business from DVD-Factory, the competitor could create a web site that looks exactly like the DVD-Factory web site, but at a different web address. To combat that tactic, DVD-Factory needs to make sure that the web server can be authenticated so that when Alice goes to the DVD-Factory web site, she knows she is dealing with DVD-Factory and not DVD-Factory s look-alike competitor. The SSL protocol is used between web clients and web servers to do secure transactions. When Alice enters the web address https://www.dvd-factory.biz, Alice s browser will invoke the SSL protocol to make sure that the web site authenticates itself to her browser. (We will talk more about how the SSL protocol accomplishes this later in the book, but at this point, it is important to note that the web browser authenticates the web site to make sure that it is dealing with DVD-Factory s web site and not another web site that is trying to spoof or imitate it.)

try { ... } catch (Exception e2) { Console.WriteLine("Caught generic exception..."); } catch (InvalidOperationException e) { Console.WriteLine("Error running turtle:"); Console.WriteLine(e.Message); } finally { Console.WriteLine("Waiting in the finally block..."); Console.ReadKey(); }

If you try to compile this, you ll see the following error:

A previous catch clause already catches all exceptions of this or of a super type ('System.Exception')

This occurs because Exception is an ancestor of InvalidOperationException, and the clause appears first in the list of catch blocks. If we switch those around, we compile successfully, as shown in Example 6-16.

itemNode.getElementsByTagName("description")[0].text : ""; var author = itemNode .getElementsByTagName("author").length >= 1 itemNode.getElementsByTagName("author")[0].text : ""; var tags = itemNode .getElementsByTagName("tags").length >= 1 itemNode.getElementsByTagName("tags")[0].text : ""; var comments = itemNode.getElementsByTagName("comments").length >= 1 itemNode.getElementsByTagName("comments")[0].text : ""; var commentRss = .getElementsByTagName("wfw:commentRss"); if(commentRss.length == 0) commentRss = itemNode .getElementsByTagName("commentRss"); if(commentRss && commentRss.length > 0) commentRss = commentRss[0].text; var pubDate = itemNode itemNode

Label(s)

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try { ... } catch (InvalidOperationException e) { Console.WriteLine("Error running turtle:"); Console.WriteLine(e.Message); } catch (Exception e2) { Console.WriteLine("Caught generic exception..."); } finally { Console.WriteLine("Waiting in the finally block..."); Console.ReadKey(); }

There s a quick way to remove unwanted using directives. If you right-click anywhere on your C# code, the context menu offers an Organize Usings item. This opens a submenu that includes a Remove Unused Usings item this works out which using directives are surplus to requirements, and removes them. The submenu offers another option designed to appeal to those who like to keep their source code tidy its Remove and Sort entry can remove unused using statements and then sort the rest into alphabetical order. This menu is shown in Figure 2-2.

The using directives are not the end of our simple program s encounter with namespaces. In fact, the very next line of code after these directives is also concerned with namespaces:

namespace HelloWorld { ... }

While using directives declare which namespaces our code consumes, this namespace keyword tells the compiler what namespace we plan to provide the types we write in our programs belong to namespaces just like the types in the class library.* Here, Visual Studio has presumed that we d like to put our code into a namespace named after the project we created. This is a common practice, although you re free to use whatever

4. List three advantages/disadvantages of using a web of trust model vs. using a certificate authority based trust model. 5. Extend the AESEncrypter program of Section 12.1.6 to compute and verify a MAC on the message in addition to encrypting and decrypting data. Be sure to use different keys for the encryption and MAC computations. 6. State how you can use symmetric encryption to achieve (a) authentication, (b) confidentiality, and (c) message integrity. 7. Write a Java program that computes HMAC-SHA-256. Use the Mac class in the Java Cryptography library. Do not write a program that constructs HMACs using the MessageDigest class, or attempt to write your own implementation of a hash function! Your program should accept a key file as a command-line argument (similar to the AESEncrypter program in Section 12.1.6), and should use the standard input and output streams. The program should output a base64- or hex-encoded 256-bit keyed hash of its input. 8. Learn about the openssl and/or Java keytool command-line utility programs. Use them to generate an RSA key pair, and generate a certificate-signing request that you could submit to a CA. 9. Add a secure logging feature to SimpleWebServer. The secure logging feature should write an integrity check code to each log entry. Use a MAC to protect each record and the entire file. What are the performance challenges in including such functionality

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