Re: [Webpush] Voluntary application server identification

Peter Beverloo <beverloo@google.com> Tue, 24 November 2015 16:45 UTC

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Date: Tue, 24 Nov 2015 16:45:04 +0000
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From: Peter Beverloo <beverloo@google.com>
To: Martin Thomson <martin.thomson@gmail.com>
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Subject: Re: [Webpush] Voluntary application server identification
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Hi Martin,

Thank you for writing this up.

Something that server identification would enable is the ability for
subscriptions to be associated with a given application server, i.e.
not only relying on endpoint secrecy.

The proposed solution, having a TLS client certificate, has the benefit
that the certificate's public key could serve as a token for this
association. Not all alternative solutions have similar shareable tokens.

Both server identification and subscription association are important for
us, and, at least initially, mechanisms that we will mandate use of. If
this proposal works for everybody, we may have to consider a status code
through which the push service can indicate this.

(I realize that this, unfortunately, stands in contrast to your statement
that requiring authentication is unwanted. I personally believe that the
benefits of authentication outweigh the privacy implications - self
signed certificates w/o data fields only act as a persistent token. I see
no problem with other push services not mandating this, of course.)

Let me produce a similar proposal, building on yours, to further explore
subscription association.

Thanks,
Peter


On Mon, Nov 23, 2015 at 11:43 PM, Martin Thomson <martin.thomson@gmail.com>
wrote:

> I did a little write up of the options that I think are most likely
> solutions for issue #44:
>   https://martinthomson.github.io/webpush-vapid/
>
> (Submission as an I-D is imminent.)
>
> All the relevant considerations are covered in the draft.  I started
> out by describing a single option, but realized that addressing the
> alternatives was probably wise.  In doing so, I think that some
> combination of alternatives might not be as crazy as I first thought.
>
> Some are clearly less good.  In particular, request signing has been
> proposed, but I think that putting a signature validation on the
> critical path is not a great idea.  The other options are much better
> in this regard.
>
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