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 06:59 UTC

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In-Reply-To: <6500d2cd-5f62-0a00-3923-d9bc864a83e4@huitema.net>
From: Rob Sayre <sayrer@gmail.com>
Date: Thu, 10 Oct 2019 13:59:40 +0700
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To: Christian Huitema <huitema@huitema.net>
Cc: Eric Rescorla <ekr@rtfm.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 Thu, Oct 10, 2019 at 1:52 PM Christian Huitema <huitema@huitema.net>;
wrote:

> If the Origin is identified by IP address, an observer on path between CDN
> and Origin just has to look at the IP address to find out whatever
> information was in the SNI.
>
I don't think that is true for subdomains, and I also don't think it is
true if a client certificate is required (that would need to be checked
before routing traffic to an application).

Is there a sensible argument for leaving this traffic in the clear?

thanks,
Rob