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

Rob Sayre <sayrer@gmail.com> Thu, 10 October 2019 05:16 UTC

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From: Rob Sayre <sayrer@gmail.com>
Date: Thu, 10 Oct 2019 12:16:40 +0700
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To: Eric Rescorla <ekr@rtfm.com>
Cc: "Salz, Rich" <rsalz@akamai.com>, "TLS@ietf.org" <tls@ietf.org>
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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 8:06 PM Eric Rescorla <ekr@rtfm.com>; wrote:

>
>> I don't think that's quite what I'm proposing. I'm proposing (optionally)
>> sending the SNI with a client certificate.
>>
>
> What are you trying to accomplish by doing that?
>

I want to keep the SNI encrypted in TLS hops that use client certificates,
but where ESNI won't work.

For example, how is the SNI transmitted in the parens here:

[ Client ] -----> (ESNI) -----> [ CDN ] -----> (???) -----> [ Origin ]

I don't think a DNS-based solution like ESNI will work for that second hop,
because the origin tends to be identified by an IP address rather than a
domain name.

thanks,
Rob