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C:\> curl -I http://example.com/index.html HTTP/1.1 200 OK Date: Thu, 10 Jan 2008 09:03:29 GMT Server: Apache/2.2.3 (CentOS) Last-Modified: Tue, 15 Nov 2005 13:24:10 GMT ETag: "280100-1b6-80bfd280" Accept-Ranges: bytes Content-Length: 438 Connection: close Content-Type: text/html; charset=UTF-8

that contains a label and a close button. This allows you to embed other useful widgets such as buttons and images into the tab label.

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.

The curl command shown in listing 16.1 is a Unix command that allows you to issue an HTTP GET request for a URL and return the output. The I switch tells it to display

Each notebook page can only display one child widget. However, each of the children can be another container, so each page can display many widgets. In fact, it is possible to use GtkNotebook as the child widget of another GtkNotebook tab.

the HTTP response headers. This and other Unix commands are available on Windows via the Cygwin shell for Windows (http://cygwin.com). The response returned contains a Content-Type header set to text/html; charset=UTF-8, which specifies both a MIME type for the content and the character encoding. The file extension has no meaning in this situation.

Caution Placing notebooks within notebooks is possible but should be done with caution, because it can easily confuse the user. If you must do this, make sure that you place the child notebook s tabs on a different side of the notebook than its parent s tabs. By doing this, the user will be able to figure out what tabs belong to which notebook.

10.2.3. Cross-Site Scripting (XSS)

File extensions aren t all bad!

If you want to insert a tab in a specific location, you can use gtk_notebook_insert_page(). This function will allow you to specify the integer location of the tab. The index of all tabs located after the inserted tab will increase by one. gint gtk_notebook_insert_page (GtkNotebook *notebook, GtkWidget *child, GtkWidget *tab_label, gint position); All three of the functions used to add tabs to a GtkNotebook will return the integer location of the tab you added or -1 if the action has failed.

Reading this chapter so far, you might think that all file extensions are bad, but that isn t the case. Knowing when information will be useful to the user is key to understanding when to use a file extension. Is it useful for the user to know that HTML has been generated from an .aspx source file No, the MIME type is sufficient to influence how that content is displayed, so no extension should be shown. But if a Word document is being served, it would be good practice to include a .doc extension in addition to setting the correct MIME type, because that will be useful when the file is downloaded to the user s computer.

In Listing 3-8, the tab-position property was set for the GtkNotebook, which was done with the following call. void gtk_notebook_set_tab_pos (GtkNotebook *notebook, GtkPositionType position);