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Re: Redirects and HSTS

From: Ryan Sleevi <sleevi@google.com>
Date: Fri, 26 Sep 2014 11:27:01 -0700
Message-ID: <CACvaWvZhkaEP0VPn-xTKtOzbgJXRfwc0A3ykMJMSU6vh0b+Vrg@mail.gmail.com>
To: Mike West <mkwst@google.com>, Tanvi Vyas <tanvi@mozilla.com>
Cc: Anne van Kesteren <annevk@annevk.nl>, WebAppSec WG <public-webappsec@w3.org>
On Fri, Sep 26, 2014 at 5:26 AM, Mike West <mkwst@google.com> wrote:

> +sleevi
> On Fri, Sep 26, 2014 at 2:24 PM, Anne van Kesteren <annevk@annevk.nl>
> wrote:
>> On Fri, Sep 26, 2014 at 2:15 PM, Mike West <mkwst@google.com> wrote:
>> > Yes, I think that's true.
>> Perhaps Gecko's stance that HSTS rewriting happens after Mixed Content
>> is correct. At least for non-same-origin HSTS. :-(
> That's how Chrome implements it, actually. Ryan, et al, are dead-set
> against moving HSTS before mixed content checking, as he claims (correctly)
> that HSTS only protects those browsers that support it. If we don't throw
> errors, we're throwing Safari and IE users under a bus.
> -mike
Re-reading this thread, I'm not sure we're on the same page.

My understanding from the last time I sync'd with Tanvi was that Mozilla
was doing HSTS rewrites before Mixed Content detection/blocing, while
Chrome does it after.
For Chrome, this is tracked in a bug about our Extension API, but which has
similar behaviours to HSTS (see
https://code.google.com/p/chromium/issues/detail?id=122548#c26 )
For Mozilla, this is https://bugzilla.mozilla.org/show_bug.cgi?id=838395

That is, Chrome considers it a "Feature", Mozilla consider(ed?) it a "Bug"

However, this is a secondary discussion to Anne's original point, AIUI.

If I understand Anne's point, the question is: Can HSTS be used for
tracking? The answer is Yes, and this is (briefly) discussed in Section
14.9 of RFC 6797 ( http://tools.ietf.org/html/rfc6797#section-14.9 ), and,
as Chris notes later in this thread, expanded upon in the context of HPKP
to explicitly document the attack (as it also exists for HPKP, although
slightly differently)
Received on Friday, 26 September 2014 18:32:12 UTC

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