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You could introduce increasing artificial delays when users attempt to log into a system over the network. The first time that a user attempts to log in, you present the user with the username and password prompt immediately. If the user enters an incorrect password, you can have the system wait 2 seconds before allowing the user to try again. If the user still gets the username or password wrong, you can have it wait 4 seconds before allowing that user to try again. Generalizing, you can exponentially increase the amount of time before letting a particular client with a particular IP address try to log into your network.

You now have an object of type MethodInfo which provides an Invoke method that calls the method this MethodInfo represents. Normally, the first argument to Invoke would be the object on which we want to invoke the method. However, because this is a static method, there is no object, so we just pass null. And then we pass the arguments for the function. Invoke is capable of calling any method, regardless of how many

arguments it has, so it expects the arguments to be wrapped in an array, even if there s only one:

Object[] parameters = new Object[1]; parameters[0] = 45 * (Math.PI/180); // 45 degrees in radians Object returnVal = cosineInfo.Invoke(null, parameters);

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using System; using System.Reflection; namespace DynamicallyInvokingAMethod { public class Tester { public static void Main() { Type theMathType = Type.GetType("System.Math"); // Since System.Math has no public constructor, this // would throw an exception. // Object theObj = // Activator.CreateInstance(theMathType); // array with one member Type[] paramTypes = new Type[1]; paramTypes[0] = Type.GetType("System.Double"); // Get method info for Cos() MethodInfo CosineInfo = theMathType.GetMethod("Cos", paramTypes); // fill an array with the actual parameters Object[] parameters = new Object[1]; parameters[0] = 45 * (Math.PI / 180); // 45 degrees in radians Object returnVal = CosineInfo.Invoke(theMathType, parameters); Console.WriteLine( "The cosine of a 45 degree angle {0}", returnVal);

}

For regular users, this might introduce an inconvenience. If a regular user happens to get his password wrong three times, he may have to wait on the order of 8 seconds before being allowed to try again. An online password-guessing attack against a system that introduces artificial delays may require many IPs to try many different combinations of a user s password before the attacker gets one right. By introducing artificial delays into the system, you decrease the number of different guesses that the attacker can try in a given unit of time.

}

}

That was a lot of work just to invoke a single method. The power, however, is that you can use reflection to discover an assembly on the user s machine, to query what methods are available, and to invoke one of those members dynamically. 18 will show how you can use the dynamic keyword to automate this for certain scenarios.

Summary

Before we run through this example, make sure you have your Windows Sidebar running. To create a gadget, from the mashup project s screen, select MashOut Download as Gadget. The dialog box shown in Figure 6-13 will appear.

All .NET components contain metadata. Some of this is essential information about the structure of our code the metadata includes the list of types, their names, the members they define, the arguments accepted by the methods, and so on. But the metadata system is also extensible attributes can be embedded alongside the core metadata, and these can then be discovered at runtime. Finally, we saw that some metadata features can make use of the items they represent we can use method information to invoke a method we discovered dynamically, for example.

Another enhancement that you can employ to increase the security of your password system is that every time a user logs in, you can display the last date, time, and potentially even location from which the user logged in. You could educate users to pay attention to when and where their last login attempts were from. If a user ever notices an inconsistency between when and where she last logged in and when and where the system reported that she last logged in, she can notify the system administration staff or customer service. For example, if a user usually logs in once a month from her home in California, but upon login, the system informs her that the last time she logged in was at 3 a.m., two weeks ago in Russia, she will realize that something is wrong. She can then notify the appropriate personnel, and the security issue can be reactively dealt with. If the last login mechanism did not exist, then the occurrence of the attack may not have been noticed.

Older versions of C# had trouble interacting with certain kinds of programs, especially those in the Microsoft Office family. You could get the job done, but before C# 4.0, it needed a lot of effort, and the results were ugly. The problem came down to a clash of philosophies: Office embraces a dynamic style, while C# used to lean heavily toward the static style. C# 4.0 now provides better support for the dynamic style, making it much easier to program Microsoft Office and similar systems from C#.

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