W3C home > Mailing lists > Public > public-webappsec@w3.org > March 2015

Re: [UPGRADE]: What's left?

From: Ilya Grigorik <igrigorik@google.com>
Date: Mon, 9 Mar 2015 15:07:29 -0700
Message-ID: <CADXXVKrA4zYfFxhEzOc6weLYO01v3jWKUos20S0DWUdxPa6+DQ@mail.gmail.com>
To: Mike West <mkwst@google.com>
Cc: Eric Mill <eric@konklone.com>, Peter Eckersley <pde@eff.org>, "public-webappsec@w3.org" <public-webappsec@w3.org>, Jeff Hodges <Jeff.Hodges@kingsmountain.com>, Tanvi Vyas <tanvi@mozilla.com>, Yves Lafon <ylafon@w3.org>, T Guild <ted@w3.org>, Daniel Appelquist <appelquist@gmail.com>, Alex Russell <slightlyoff@google.com>, Yoav Weiss <yoav@yoav.ws>, Martin Thomson <martin.thomson@gmail.com>
On Mon, Mar 9, 2015 at 8:19 AM, Mike West <mkwst@google.com> wrote:
> As an aside, it occurred to me overnight that we can avoid the redirect
> (and the signal) for HTTP pages if we interpret the presence of an
> `upgrade-insecure-requests` directive in an insecure response as asking for
> the resource itself to be upgraded. Filed
> https://github.com/w3c/webappsec/issues/212 to explain a bit, and think
> about this some more.

"client should behave as though it received a redirect response to
https://example.com/" ... what does that mean exactly? As in, the UA should
treat it as a 302 and transparently initiate a new request? Would it
remember this for subsequent navigations?

Re, avoiding UA sniffing: have you considered an opt-in strategy for
delivering the header? In CH we have "Accept-CH" [1] which acts as a signal
for the UA to advertise its capabilities to the server.. this allows the
site to opt-in without burdening the rest of the web with the same
on-by-default header.


>> * understand why the tradeoffs and implementation work make sense for
>> their body of legacy content
>> ...then I think they can probably also evaluate the effect of HSTS on
>> their website under these circumstances.
>> This whole upgrade spec is about providing a long-term migration path,
>> right? Where we expect browser update cycles to outpace the ability of
>> a website with a large body of content to go through and upgrade the
>> resource links?
> This is a great way of phrasing the way that I've been approaching the
> problem, thanks, Eric!
>> It could be that the tradeoff here is that HSTS is effectively not
>> advised until the presence of legacy clients that don't support the
>> UPGRADE spec diminishes to an acceptable amount. At that time, a
>> website can shut off the HTTPS->HTTP downgrade, and add HSTS, at the
>> same time. The UPGRADE spec could recommend this strategy.
> This is what I was trying to get at in my previous email. I see HSTS as
> putting a cap on an otherwise pristine TLS configuration, and
> pinky-swearing to the user agent that you're going to keep it running for X
> seconds. Given that we're talking about sites that are in the middle of a
> migration process, and that we're presupposing that they're going to have
> both an HTTP and HTTPS version of the site running alongside each other,
> it's not clear that setting HSTS is going to be high on their priority
> lists.
> In the other thread, I'm even going to argue that this is an advantage of
> UPGRADE over HSTS2, as the former is representation-specific, which allows
> authors to make granular decisions about which pages can safely be
> upgraded, without locking themselves into something for a long time.
> --
> Mike West <mkwst@google.com>, @mikewest
> Google Germany GmbH, Dienerstrasse 12, 80331 München,
> Germany, Registergericht und -nummer: Hamburg, HRB 86891, Sitz der
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> Flores
> (Sorry; I'm legally required to add this exciting detail to emails. Bleh.)
Received on Monday, 9 March 2015 22:08:37 UTC

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