The X-Frame-Options response header

[Nytro]

The X-Frame-Options response header

O masura de precautie impotriva ClickJacking-ului.

Sursa: https://developer.mozilla.org/en/The_X-FRAME-OPTIONS_response_header

Introduced in Gecko 1.9.2.9

(Firefox 3.6.9)

The X-Frame-Options HTTP response header can be used to indicate whether or not a browser should be allowed to render a page in a <frame> or <iframe>. Sites can use this to avoid clickjacking attacks, by ensuring that their content is not embedded into other sites.

Using X-Frame-Options

There are two possible values for X-Frame-Options:

DENY

The page cannot be displayed in a frame, regardless of the site attempting to do so.

SAMEORIGIN

The page can only be displayed in a frame on the same origin as the page itself.

In other words, if you specify DENY, not only will attempts to load the page in a frame fail when loaded from other sites, attempts to do so will fail when loaded from the same site. On the other hand, if you specify SAMEORIGIN, you can still use the page in a frame as long as the site including it in a frame it is the same as the one serving the page.

Results

When an attempt is made to load content into a frame, and permission is denied by the X-Frame-Options header, Firefox currently renders about: blank into the frame. At some point, an error message of some kind will be displayed in the frame instead.

Browser compatibility

[B]Browser 	           Lowest version[/B]
Internet Explorer 	           8.0
Firefox (Gecko) 	     3.6.9 (1.9.2.9)
Opera 	                          10.50
Safari 	                           4.0
Chrome 	                      4.1.249.1042 

De vazut, interesant:

http://blogs.msdn.com/b/ie/archive/2009/01/27/ie8-security-part-vii-clickjacking-defenses.aspx