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Re: [TLS] Consensus Call on draft-ietf-tls-dnssec-chain-extension

Viktor Dukhovni <ietf-dane@dukhovni.org> Wed, 18 April 2018 21:15 UTC

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From: Viktor Dukhovni <ietf-dane@dukhovni.org>
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Date: Wed, 18 Apr 2018 17:15:12 -0400
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Subject: Re: [TLS] Consensus Call on draft-ietf-tls-dnssec-chain-extension
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> On Apr 18, 2018, at 5:03 PM, Richard Barnes <rlb@ipv.sx> wrote:
> 
> The only "reserved" in RFC 5246 is a few code points that are reserved for private use.  No reserved fields.

The field is NOT reserved, it carries an "extension support lifetime" of 16-bits whose zero value means "DO NOT PIN".  Other values will be defined in a follow-on draft, but clients must interpret those also as zero unless they implement the other draft.

Therefore, a client implementing this draft has complete semantics for the field, it explicitly prohibits pinning, which might otherwise happen, especially if no follow-on document materializes.

-- 
	Viktor.

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