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/* Add the tree model to the tree view and unreference it so that the model will * be destroyed along with the tree view. */ gtk_tree_view_set_model (GTK_TREE_VIEW (treeview), GTK_TREE_MODEL (store)); g_object_unref (store); scrolled_win = gtk_scrolled_window_new (NULL, NULL); gtk_scrolled_window_set_policy (GTK_SCROLLED_WINDOW (scrolled_win), GTK_POLICY_AUTOMATIC, GTK_POLICY_AUTOMATIC); gtk_container_add (GTK_CONTAINER (scrolled_win), treeview); gtk_container_add (GTK_CONTAINER (window), scrolled_win); gtk_widget_show_all (window); gtk_main (); return 0; } /* Add three columns to the GtkTreeView. All three of the columns will be * displayed as text, although one is a gboolean value and another is * an integer. */ static void setup_tree_view (GtkWidget *treeview) { GtkCellRenderer *renderer; GtkTreeViewColumn *column; /* Create a new GtkCellRendererText, add it to the tree view column and * append the column to the tree view. */ renderer = gtk_cell_renderer_text_new (); column = gtk_tree_view_column_new_with_attributes ("Buy", renderer, "text", BUY_IT, NULL); gtk_tree_view_append_column (GTK_TREE_VIEW (treeview), column); renderer = gtk_cell_renderer_text_new (); column = gtk_tree_view_column_new_with_attributes ("Count", renderer, "text", QUANTITY, NULL); gtk_tree_view_append_column (GTK_TREE_VIEW (treeview), column); renderer = gtk_cell_renderer_text_new (); column = gtk_tree_view_column_new_with_attributes ("Product", renderer, "text", PRODUCT, NULL); gtk_tree_view_append_column (GTK_TREE_VIEW (treeview), column); }

After the user clicks yes or no, the user s response is recorded by a pay variable, and the price variable with a corresponding value is sent back to the server To change the value of the transaction, the attacker can view the source code of the HTML form in a text editor, and change the value in the hidden form field from 550 to 001 An attacker could simply save the modified HTML to disk, reopen it with a browser, and submit the form with the modified price to the server! When the attacker clicks yes in the reopened HTML page, the HTTP request that is constructed based on the manipulated form is for the $001 transaction instead of the correct price of $550 The HTTP request that is sent to the server looks like the following:2 GET /submit_order price=001&pay=yes HTTP/1.

<form method="post" action="/home/save"> <%= Html.AntiForgeryToken() %> <label for="Name">Name:</label> <%= Html.TextBox("Name") %> <button type="submit">Submit</button> </form>

Creating the GtkTreeView widget is the easiest part of the process. You need only to call gtk_tree_view_new(). If you want to add the default tree model on initialization, you can use gtk_tree_view_new_with_model(), but a tree model can easily be applied to a GtkTreeView after initialization with gtk_tree_view_set_model(). The gtk_tree_view_new_with_model() function is simply a convenience function. There are many functions that allow you to customize a GtkTreeView to fit your needs. For example, above each GtkTreeViewColumn, a header label is rendered that tells the user more about the column contents. You can set gtk_tree_view_set_headers_visible() to FALSE in order to hide them. void gtk_tree_view_set_headers_visible (GtkTreeView *treeview, gboolean visible);

Once the token and the attribute are in place, submissions from the site using both will succeed, but attackers will no longer be able to formulate XSRF attacks. If they try, an exception like the one shown in figure 11.8 appears. The appropriate time to incorporate ValidateAntiForgeryTokenAttribute on actions that accept form submissions is now. Public-facing websites and intranet sites are vulnerable to XSRF, and this quick task is required to develop a secure application. In the next section, we ll look at JSON hijacking, which is another attack that requires developers using ASP.NET MVC 2 to take certain precautions.

0 The submit_order program simply retrieves the $001 price from the HTTP request, and authorizes a credit card charge of $001 prior to delivering the pizza! To summarize, hidden form fields are only visually hidden from the user, but are effectively sent in the clear from a security standpoint As such, they can be easily accessed and manipulated by malicious clients In this particular case, we have shown how the attacker can use the browser and a text editor to send an HTTP request with an altered price However, there is no reason that an attacker needs to use a browser or text editor to place HTTP requests to buy pizzas.

Note You should be careful when hiding tree view headers, because they help the user know the contents

JSON (pronounced like the English name, Jason) hijacking is a rare hack similar to XSRF, except it s targeted to request secure JSON from vulnerable applications. The JSON hijacking process involves several steps:

of each column. They should only be hidden if there is no more than one column or the contents of each column are clearly explained in some other manner.