[webkit-dev] User Agent Client Hints

[Yoav Weiss]

Thanks for re-reviewing, Maciej!

Adding Mike Taylor, who's likely to take a closer look at this.

On Mon, Nov 2, 2020 at 2:17 AM Maciej Stachowiak <mjs at apple.com> wrote:

>
> I just did a fresh review of that spec and explainer. Thanks for
> addressing many of the previous issues. This addresses many of the
> potential objections.
>
> Here’s the new issues I filed:
>
> https://github.com/WICG/ua-client-hints/issues/141
> https://github.com/WICG/ua-client-hints/issues/142
> https://github.com/WICG/ua-client-hints/issues/143
> https://github.com/WICG/ua-client-hints/issues/144
> https://github.com/WICG/ua-client-hints/issues/145
> https://github.com/WICG/ua-client-hints/issues/146
> https://github.com/WICG/ua-client-hints/issues/147
> https://github.com/WICG/ua-client-hints/issues/148
> https://github.com/WICG/ua-client-hints/issues/149
> https://github.com/WICG/ua-client-hints/issues/150
> https://github.com/WICG/ua-client-hints/issues/151
>
>
Thanks for filing those! We'll take a look and respond shortly.


> Most of these are minor/editorial, but I think 151 is potentially a
> deal-breaker. I may be misreading the spec, but as written
> getHighEntropyValues seems to give access to all of the high entropy client
> hints to third-party scripts in the first party context, and scripts
> running in third-party iframes, regardless of which ones the site has opted
> into via the relevant HTTP header.
>

That's indeed the case, as we didn't consider the Client Hints opt-in to be
something that impacts the availability of the JS API. (as it doesn't do
that for other hints)

That would be a huge problem, as it would grant a lot of active
> fingerprinting surface unnecessarily
>

We did discuss
<https://github.com/WICG/ua-client-hints/issues/37#issuecomment-576730548>
adding
a Feature Policy (now Permission Policy) to that effect. Would that help
with your concerns?


> (perhaps even expanding beyond what is currently possible with the UA
> string).
>

Can you expand on that last point?


>
> Regards,
> Maciej
>
>
> On Oct 27, 2020, at 12:35 AM, Yoav Weiss <yoav at yoav.ws> wrote:
>
> Yet-another ping! :)
>
> On Wed, Oct 7, 2020 at 8:23 AM Yoav Weiss <yoav at yoav.ws> wrote:
>
>> Friendly ping! :)
>>
>> On Wed, Sep 30, 2020 at 9:29 AM Yoav Weiss <yoav at yoav.ws> wrote:
>>
>>> Hi WebKit folks,
>>>
>>> Circling back on the previous discussion
>>> <https://lists.webkit.org/pipermail/webkit-dev/2020-May/031195.html>
>>> about User-Agent ClientHint. The feature was implemented in Chromium and is
>>> being rolled out in Chrome.
>>>
>>> There were some concerns mentioned in the previous thread, that we
>>> believe were since addressed. Would the feature be something that WebKit
>>> would consider shipping?
>>>
>>> Cheers :)
>>> Yoav
>>>
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>
>
>
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