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 12:51 UTC

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From: Eric Rescorla <ekr@rtfm.com>
Date: Wed, 9 Oct 2019 05:51:15 -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 5:47 AM Rob Sayre <sayrer@gmail.com>; wrote:

>
>
> 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).
>

How would that work? The SNI is used by the server to determine what
certificate to send. That's why it's sent in CH.

-Ekr


> thanks,
> Rob
>
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