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

"Salz, Rich" <rsalz@akamai.com> Wed, 09 October 2019 12:59 UTC

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From: "Salz, Rich" <rsalz@akamai.com>
To: Rob Sayre <sayrer@gmail.com>, Eric Rescorla <ekr@rtfm.com>
CC: "TLS@ietf.org" <tls@ietf.org>
Thread-Topic: [TLS] SNI from CDN to Origin (was I-D Action: draft-ietf-tls-sni-encryption-08.txt)
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Date: Wed, 9 Oct 2019 12:59:06 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/tls/Q_yHHQeUIlX_6f4dOkCEfKsCUxg>
Subject: Re: [TLS] SNI from CDN to Origin (was I-D Action: draft-ietf-tls-sni-encryption-08.txt)
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  *   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.