Re: [TLS] SNI from CDN to Origin (was I-D Action: draft-ietf-tls-sni-encryption-08.txt)

Rob Sayre <sayrer@gmail.com> Wed, 09 October 2019 12:47 UTC

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From: Rob Sayre <sayrer@gmail.com>
Date: Wed, 9 Oct 2019 19:47:06 +0700
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To: "Salz, Rich" <rsalz@akamai.com>
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Subject: Re: [TLS] SNI from CDN to Origin (was I-D Action: draft-ietf-tls-sni-encryption-08.txt)
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On Wed, Oct 9, 2019 at 7:31 PM Salz, Rich <rsalz@akamai.com>; wrote:

>
>    - A link from CDN to Origin is just a particularly easy-to-deploy use
>    case, since client certificates are already in wide use and IPv6 tends to
>    work flawlessly.
>
>
>
> It does?  Gee, cool.
>
> I was being sarcastic, not angry. I shouldn’t have done so.
>
>
>
> But now I am not sure what you are asking for.  Asking about CDN to Origin
> using ESNI or ESNI with a client cert?
>

I'm wondering what the backhaul traffic from CDN to Origin looks like, even
if a user-agent request to the CDN used ESNI. I noticed that many CDNs
provide client certificates.

In TLS handshakes that use a client certificate, it seems like the SNI
might be able to be sent with the second message from the client (alongside
the client certificate).

thanks,
Rob