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Re: Upgrade mixed content URLs through HTTP header

From: Eduardo' Vela\ <evn@google.com>
Date: Tue, 3 Feb 2015 10:09:38 +0100
Message-ID: <CAFswPa94C+34uFhD4sb8pX0LOhw_aKQU=3KmL0sjtKRLmL5YSA@mail.gmail.com>
To: Mike West <mkwst@google.com>
Cc: Anne van Kesteren <annevk@annevk.nl>, Wendy Seltzer <wseltzer@w3.org>, Ryan Sleevi <sleevi@google.com>, Adam Langley <agl@google.com>, Peter Eckersley <pde@eff.org>, WebAppSec WG <public-webappsec@w3.org>
Could we use CSP for this?

default-src https: 'upgrade-unsafe'
On Feb 3, 2015 10:03 AM, "Mike West" <mkwst@google.com> wrote:

> On Tue, Feb 3, 2015 at 8:40 AM, Anne van Kesteren <annevk@annevk.nl>
> wrote:
>> On Mon, Feb 2, 2015 at 7:53 PM, Daniel Kahn Gillmor
>> <dkg@fifthhorseman.net> wrote:
>> > Why does this need to be a separate header at all?  Why not just assume
>> > that sites with STS set should opportunistically upgrade http resources
>> > to https?
>> We have already decided that a resource on example.com (with HSTS)
>> that has a subresource <img src=http://example.com/img> will result in
>> a mixed content warning.
> This actually seems meaningfully different from the way we've phrased the
> question before. If we began interpreting strict transport security as
> rewriting all URLs on a page, we'd avoid some of the questions around
> request-order-specific behavior.
> In MIX, we currently point to some of this in
> https://w3c.github.io/webappsec/specs/mixedcontent/#further-action. I'd
> been thinking about STS as a signal to enable strict-mode (e.g. don't even
> attempt to load any insecure resource), but optimistically rewriting
> resource URLs (and hard-failing if they fail to load) is an interesting
> approach.
> On Tue, Feb 3, 2015 at 1:42 AM, Peter Eckersley <pde@eff.org> wrote:
>> > That said, I'm not sure it actually solves W3C's concern, as it would
>> leave
>> > legacy clients out in the cold. The only way to support clients that
>> don't
>> > support the thing we haven't implemented yet would be to alter the
>> links at
>> > the source. I totally understand that that's difficult, but it seems
>> > essential.
>> It seems like you're saying that a security mechanism can't be allowed
>> to help new clients upgrade to HTTPS if it doesn't also help old ones?
> That's not what I mean to say. With regard to the W3C, my (apocryphal?*)
> understanding is that the main blocker to deploying HTTPS more widely is
> legacy clients, not legacy content, and that they'd need to alter the
> source in order to get over that hurdle. The legacy concern was specific to
> this example, not a general statement on adding features to the platform.
> *Wendy (hi!) could probably comment here.
> --
> Mike West <mkwst@google.com>, @mikewest
> Google Germany GmbH, Dienerstrasse 12, 80331 München,
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Received on Tuesday, 3 February 2015 09:10:08 UTC

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