W3C home > Mailing lists > Public > public-webappsec@w3.org > June 2014

Re: CSP: 'no-external-navigation'?

From: Mike West <mkwst@google.com>
Date: Mon, 30 Jun 2014 22:26:05 +0200
Message-ID: <CAKXHy=cBXUDtz6-KBZGqxYfoBPw0MOPxSt+OwyvZ1bF43tHSSw@mail.gmail.com>
To: Michal Zalewski <lcamtuf@coredump.cx>, pamela.fox@gmail.com
Cc: "public-webappsec@w3.org" <public-webappsec@w3.org>

Mike West <mkwst@google.com>
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On Mon, Jun 30, 2014 at 8:45 PM, Michal Zalewski <lcamtuf@coredump.cx>

> > We've talked briefly about similar concepts in the past in the context of
> > the next iteration of CSP; at first glance it seems like something that
> > might be useful in narrow use-cases, but that I'm worried will be abused
> to
> > keep folks on pages they don't particularly want to be on (see  what
> > happened with `window.onbeforeunload` modals).
> If I read this correctly, the request is to prevent programmatic
> navigation within the CSP-sandboxed frame, not prevent the user from
> relying on bookmarks, manually entered URLs, etc.
> That said, I'm not sure this is a very meaningful goal if you're
> otherwise permitting largely unconstrained JS to run on the page (and
> you're using CSP to "sandbox" it) - what would be the goal? Can't the
> JS achieve roughly the same without navigating its own frame away?
> /mz
Received on Monday, 30 June 2014 20:26:54 UTC

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