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Re: [TLS] draft-ietf-tls-tls13-16

"Salz, Rich" <rsalz@akamai.com> Wed, 28 September 2016 16:09 UTC

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From: "Salz, Rich" <rsalz@akamai.com>
To: Stephen Checkoway <s@pahtak.org>, "tls@ietf.org" <tls@ietf.org>
Thread-Topic: [TLS] draft-ietf-tls-tls13-16
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Date: Wed, 28 Sep 2016 16:08:53 +0000
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Subject: Re: [TLS] draft-ietf-tls-tls13-16
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> C.2 Negotiating with an older client says, "If the
>    "supported_versions" extension is present, the server MUST negotiate
>    the highest server-supported version found in that extension."

I agree that an appendix is the wrong place to put this.  And that specifying the client order is pointless.

But I disagree with this being a MUST.  There may be times when the server knows more than the client and will know that a lower version is more appropriate.  E.g., interfering middleboxes or regulatory regimes.
 
--  
Senior Architect, Akamai Technologies
Member, OpenSSL Dev Team
IM: richsalz@jabber.at Twitter: RichSalz

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