Re: [TLS] ECH-10 interop test server

Christopher Patton <cpatton@cloudflare.com> Mon, 07 June 2021 16:24 UTC

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From: Christopher Patton <cpatton@cloudflare.com>
Date: Mon, 7 Jun 2021 09:24:00 -0700
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To: Rob Sayre <sayrer@gmail.com>
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Subject: Re: [TLS] ECH-10 interop test server
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Hi Rob, let me look into it.

Chris P.

On Fri, May 28, 2021 at 11:36 AM Rob Sayre <sayrer@gmail.com> wrote:

> On Mon, Apr 5, 2021 at 10:02 AM Christopher Patton <cpatton=
> 40cloudflare.com@dmarc.ietf.org> wrote:
>
>> Hi list, just FYI that Cloudflare's test server is upgrading to
>> draft-ietf-tls-esni-10 this morning. It should finish rolling out in a few
>> hours. Note that we've dropped support for draft-ietf-tls-esni-09.
>>
>> The endpoint is https://crypto.cloudflare.com. You'll also find our ECH
>> config in the HTTPS resource record.
>>
>
> I've gotten a Rustls client to interoperate with this server, but I had
> some trouble triggering HRR, since Rustls always sends a key-exchange group
> in TLS 1.3. I managed to hack up a ClientHello and handshake with no
> initial key-exchange group, but perhaps it could be easier.
>
> It might be nice to have this server reject secp384r1 and offer X25519 in
> an HRR, or something like that.
>
> thanks,
> Rob
>
>