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

Eric Rescorla <ekr@rtfm.com> Wed, 09 October 2019 13:06 UTC

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From: Eric Rescorla <ekr@rtfm.com>
Date: Wed, 09 Oct 2019 06:05:38 -0700
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To: Rob Sayre <sayrer@gmail.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 6:04 AM Rob Sayre <sayrer@gmail.com> wrote:

> On Wed, Oct 9, 2019 at 7:59 PM Salz, Rich <rsalz@akamai.com> wrote:
>
>>
>>    - But, if I have Cloudflare (or any CDN) configured for a domain, and
>>    the origin is only available via IPv6, the need for a disambiguating SNI in
>>    the ClientHello from CDN to Origin is not clear.
>>
>>
>>
>> That assumes that there is a one-to-one correspondence between an origin
>> and its certificate, which isn’t true.  I might have “api.example.com”
>> and “new-api.example.com” at the same IP address.
>>
>
> 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?

-Ekr


I agree that SNI in ClientHello is needed to choose server certificates for
> IPv4, for the reason you say.
>
> thanks,
> Rob
>

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