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In all the examples discussed so far, we have talked about people authenticating people or people authenticating themselves to computers In a large distributed system, however, computers are also interacting with other computers The computers may have to authenticate themselves to each other because all computers cannot be trusted equally There are many protocols that can be used to allow computer-to-computer authentication, and these protocols will, in general, support three types of authentication: client authentication, server authentication, and mutual authentication Client authentication involves the server verifying the client s identity, server authentication involves the client verifying the server s identity, and mutual authentication involves the client and server verifying each other s identity When we discuss protocols, such as Secure Sockets Layer (SSL) in 15, we will discuss the different modes they use to support client, server, and mutual authentication.

You can now iterate through this array, printing out the properties of the BugFixAttri bute object. Example 17-2 replaces the Main method in the Tester class from Example 17-1.

Now, you are ready to view the page in a browser. If you haven t saved the page, do so. Next, preview the page in a browser in Expression Web by selecting File Preview in Browser and choosing your browser. I selected Internet Explorer to show the page displayed in Figure 6-10.

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public static void Main(string[] args) { MyMath mm = new MyMath(); Console.WriteLine("Calling DoFunc(7). Result: {0}", mm.DoFunc1(7)); // get the member information and use it to // retrieve the custom attributes System.Reflection.MemberInfo inf = typeof(MyMath); object[] attributes; attributes = inf.GetCustomAttributes( typeof(BugFixAttribute), false); // iterate through the attributes, retrieving the // properties foreach (Object attribute in attributes) { BugFixAttribute bfa = (BugFixAttribute)attribute; Console.WriteLine("\nBugID: {0}", bfa.BugID); Console.WriteLine("Programmer: {0}", bfa.Programmer); Console.WriteLine("Date: {0}", bfa.Date); Console.WriteLine("Comment: {0}", bfa.Comment); }

}

Output: Calling DoFunc(7). Result: 9.3333333333333333 BugID: 121 Programmer: Jesse Liberty Date: 01/03/08 Comment: BugID: 107 Programmer: Jesse Liberty Date: 01/04/08 Comment: Fixed off by one errors

When you put this replacement code into Example 17-1 and run it, you can see the metadata printed as you d expect.

Whether client, server, or mutual authentication is done often depends upon the nature of the application and the expected threats Many e-commerce web sites provide server authentication once a user is ready to make a purchase because they do not want the client to submit a credit card number to a spoofed or impostor web site Spoofed web sites are a significant security threat because they do not cost much to set up On the other hand, in older cell phone networks, only client authentication was required Cell phone towers (servers) would only check that a phone (client) that attempted to communicate with it was owned by an authentic customer The phones did not authenticate the cell phone towers because cell phone towers were costly to set up, and an attacker would require significant capital to spoof a cell phone tower.

You can use reflection to explore and examine the contents of an assembly. You can find the types it contains. You can discover the methods, fields, properties, and events associated with a type, as well as the signatures of each of the type s methods. You can also discover the interfaces supported by the type, and the type s base class. If we were using this to support a plug-in system for extending our application, we d need to load at runtime assemblies we didn t know about when we wrote our application. We can load an assembly dynamically with the Assembly.Load() static method.

The Assembly class encapsulates the actual assembly itself, for purposes of reflection. One signature for the Load method is:

public static Assembly Load(string assemblyName)

For example, Mscorlib.dll has the core classes of the .NET Framework, so we can pass that to the Load() method:

On the other hand, the cell phones themselves were much cheaper, and hence wireless carriers only required phones to be authenticated Today, the cost of cell phone base stations is significantly cheaper, and modern-day cell phone networks use mutual authentication Now that we have completed our discussion of authentication, we are going to explore our next security concept: authorization..

Assembly a = Assembly.Load("Mscorlib");

(In fact Mscorlib.dll will already be loaded, but this method doesn t mind it returns the assembly we asked for, loading it first if necessary.) There s also a LoadFrom method that takes a file path. Once the assembly is loaded, we can call GetTypes() to return an array of Type objects. A Type object represents a specific type declaration, such as a class, interface, array, struct, delegate, or enumeration:

As you can see, the mashup appears slightly cut off and is not in the best position. A great feature of a WYSIWYG HTML editor is the ability to easily modify content with the click of a button or a drag of a mouse. Let s improve the display of the mashup. Returning to the editor and the web page, close the preview of the page, and bring the editor back to the front. In Expression Web, select the Design viewing option from the bottom of the page editing screen. You should see a graphical representation of the IFRAME you inserted. Click the IFRAME, and you should see resizing handles appear to the right of and below it (see Figure 6-11).

Type[] types = a.GetTypes();

The assembly returns an array of types that we can display in a foreach loop, as shown in Example 17-3. Because this example uses the Type class, you will want to add a using directive for the System.Reflection namespace.

using System; using System.Reflection; namespace ReflectingAnAssembly { public class Tester { public static void Main() { // what is in the assembly Assembly a = Assembly.Load("Mscorlib"); Type[] types = a.GetTypes(); foreach (Type t in types) { Console.WriteLine("Type is {0}", t); } Console.WriteLine( "{0} types found", types.Length); } } }

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