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In addition, there are a number of challenges in implementing a scheme that ties sessions to IP addresses without adversely affecting usability. There are a number of situations in which a user s session may legitimately result in requests originating from different IP addresses. For example, a user who accesses the Internet using a dial-up connection may be assigned a different IP address every time he connects. Similarly, it is common for laptop users to access the Internet via several different providers (and hence with different IP addresses) in a single day (e.g., from home, at work, or via the wireless network in a coffee shop). For less frequently used applications involving sensitive data or high-value transactions (e.g., online banking applications), it may be appropriate to indeed tie sessions to a single IP address at login time and require the user to re-authenticate whenever his computer s IP address changes. For other applications, this may not be an acceptable user experience. For such applications, a heuristic approach might be more appropriate; the application might reject a request only if there is a very strong indication that it includes a stolen session cookie (e.g., a case in which a session is created based on a login request that originates from an IP address in California, and the corresponding session cookie appears 5 minutes later in a request that originates in Eastern Europe).

In addition to arranging and decorating children, containers are tasked with resizing child widgets. Resizing is performed in two phases: size requisition and size allocation. In short, these two steps negotiate the size that is available to a widget. This is a recursive process of communication between the widget, its ancestors, and its children. Size requisition refers to the desired size of the child. The process begins at the top-level widget, which asks its children for their preferred sizes. The children ask their children and so on, until the last child is reached.

The components that allow rich form posting and model binding are critical pieces of the ASP.NET MVC Framework. They eliminate the need to resort to examining the underlying Request object. The combination of custom model binders and custom value providers allows us to keep the existing rich binding behavior and extend it for custom and more exotic scenarios. The value provider abstraction added in ASP.NET MVC 2 expands the possibilities for providing model binding values beyond the traditional form and query string variables without heavily modifying the underlying model binding behavior. In the next chapter, we ll look at how ASP.NET MVC 2 can be used to validate user input on both the server and the client.

At this point, the last child decides what size it wants to be based on the space it needs to be shown correctly on the screen and any size requests from the programmer For example, a GtkLabel widget will ask for enough space to fully display its text on the screen or more space if you requested it to have a larger size The child then passes this size to its ancestors until the top-level widget receives the amount of space needed based on its children s requisitions typedef struct { gint width; gint height; } GtkRequisition; Each widget stores its size preferences as width and height values in a GtkRequisition object Keep in mind that a requisition is only a request; it does not have to be honored by the parent widget When the top-level widget has determined the amount of space it wants, size allocation begins.

The previous sections focused on the ability of a (potentially malicious) page to cause content to be loaded into the user s browser. At the same time, we need to consider that the malicious page is in fact causing a request to be made by the user s browser to the web server serving our application; this request may cause our application to initiate actions or state changes. For instance, consider a page at www.hackerhome.org with this HTML fragment: <form name="f" method="POST" action="http://www.mywwwservice.com/action"> <input type="hidden" name="cmd" value="do_something"> ... </form> <script> document.f.submit(); </script>

Implementing Data Annotations Extending the ModelMetadataProvider Enabling ASP .NET Ajax client-side validation

If you have set the top-level widget as nonresizable, the widget will never be resized; no further action will occur and requisitions will be ignored Otherwise, the top-level widget will resize itself to the desired size It will then pass the amount of available space to its child widget This process is repeated until all widgets have resized themselves typedef struct { gint x; gint y; gint width; gint height; } GtkAllocation; Size allocations for every widget are stored in one instance of the GtkAllocation structure for each child This structure is passed to child widgets for resizing with gtk_widget_size_allocate() This function can be called explicitly by the programmer as well, but doing so is not a good idea in the majority of cases In most situations, children will be given the space they request, but there are certain circumstances when this cannot happen.