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UpdateHeader({ "date_time": "2006/04/29 10:15", "logged_in_user": "alice@learnsecurity.com", "account_balance": 256.98 }) The client-side code would evaluate this snippet of JavaScript, while having provided the callback function UpdateHeader. When the callback is invoked, it might in this case use the data provided in its argument to populate a status bar at the top of the browser window. How could this be exploited by a malicious site Suppose our user visits a page on www.hackerhome.org containing the following HTML: <script> function UpdateHeader(dict) { if (dict['account_balance'] > 100) { do_phishing_redirect(dict['logged_in_user']); } } </script> <script src="http://www.mywwwservice.com/json/nav_data callback=UpdateHeader"> </script> After loading this page, the user s browser would, as usual, resolve the reference to the included script. When making the request to fetch that script, the browser would, again as usual, send along any cookies it currently holds for the domain www.mywwwservice.com. Our application would reply to the request based on the user s cookie, and return the preceding JavaScript fragment containing our user s information. However, this JavaScript is now evaluated in the context of the malicious document. In particular, the definition of the callback is the one provided by the attacker, which can in turn evaluate, process, and disclose the data as it pleases.

Because the Xaml refers to this handler method in the Button element s Click attribute, the method will run anytime the button is clicked. The one line of code we added here refers to the TextBlock element. If you look at the Xaml, you ll see that the element s x:Name attribute has a value of messageText, and this lets us use this name in the code behind to refer to that element. Example 20-2 sets the Text property, which, as you ve no doubt guessed, causes the TextBlock to show the specified text when the button is clicked.

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Just to be clear, this is happening on the client side. The Silverlight plugin downloads your application and then renders the UI as defined by your Xaml. It hosts your code behind (and any other code in your Silverlight project) inside the web browser process, and calls the specified event handlers without needing to communicate any further with the web server. Silverlight applications can communicate back with the web server after being loaded, but this click-handling interaction does not involve the server at all, unlike clicking a button on a normal web form.

The Xaml in Example 20-1 and the C# in Example 20-2 both set the Text of the TextBlock. The Xaml does this using standard XML s attribute syntax, while the C# code does it using normal C# property syntax. This highlights an important feature of Xaml: elements typically correspond to objects, and attributes correspond either to properties or to events.

Although Xaml is the usual mechanism for defining the user interface of WPF and Silverlight applications, it s not strictly necessary. You could remove the bold code in Example 20-1 that adds the Button and TextBlock to the Xaml, and instead modify the class definition and constructor in the code behind, as Example 20-3 shows.

public partial class MainPage : UserControl { private Button myButton; private TextBlock messageText; public MainPage() { InitializeComponent(); myButton = new Button { HorizontalAlignment = HorizontalAlignment.Center, VerticalAlignment = VerticalAlignment.Top, FontSize = 20, Content = "Click me!" }; myButton.Click += myButton_Click; messageText = new TextBlock { Text = "Message will appear here", TextWrapping = TextWrapping.Wrap, TextAlignment = TextAlignment.Center, FontSize = 30, FontWeight = FontWeights.Bold, HorizontalAlignment = HorizontalAlignment.Center, VerticalAlignment = VerticalAlignment.Center }; LayoutRoot.Children.Add(myButton); LayoutRoot.Children.Add(messageText);

10.2.3. Cross-Site Scripting (XSS)

}

Each element that had an x:Name attribute has been replaced here with a field in the class, and we initialize that field in the constructor This example uses the C# object initializer syntax to set the property values to emphasize the structural similarity between this code and the Xaml it replaces, but normal property setter syntax works too, of course XML attribute values are just text, whereas in C# we have to provide values of the correct type enumeration entries, numbers, or strings as appropriate The Xaml compiler works out how to turn text into something of the appropriate type (It uses the NET Framework class library s TypeConverter system to do this.

) Also, as you will recall C# uses a different syntax to attach event handlers than the one for setting properties we ve used the += syntax here whereas Xaml uses attribute syntax for both properties and event handlers This code has the same effect as Xaml Xaml is really just a language for creating objects, setting their properties, and attaching event handlers, so for the most part it doesn t really matter whether you use C# or Xaml to create your user interface This raises the question of why we have Xaml at all, when C# seems to work perfectly well The main reason Xaml exists is to make it possible to create user interfaces in tools other than a text editor For example, Microsoft offers a program called Expression Blend, part of its Expression family of design-oriented programs.

Blend is a tool for creating WPF and Silverlight user interfaces, and it works mostly in Xaml This separation is more than just a convenience for people wanting to write design tools It s useful to both developers and designers It enforces some separation, making it possible for designers to work on the visual design of an application, without needing tools that can edit C# source files In fact, successful collaboration between developers and designers takes a bit more than this the separation of Xaml and code behind is not in itself sufficient, because it s still fairly easy for designers and developers to trip over one another.

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