Re: [TLS] Publication has been requested for draft-ietf-tls-oldversions-deprecate-05

Eric Rescorla <ekr@rtfm.com> Fri, 04 October 2019 14:48 UTC

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From: Eric Rescorla <ekr@rtfm.com>
Date: Fri, 4 Oct 2019 07:47:50 -0700
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To: Rob Sayre <sayrer@gmail.com>
Cc: Cullen Jennings <fluffy@iii.ca>, "tls@ietf.org" <tls@ietf.org>, Sean Turner via Datatracker <noreply@ietf.org>, IESG Secretary <iesg-secretary@ietf.org>, "tls-chairs@ietf.org" <tls-chairs@ietf.org>, John Mattsson <john.mattsson=40ericsson.com@dmarc.ietf.org>, Benjamin Kaduk <kaduk@mit.edu>
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Subject: Re: [TLS] Publication has been requested for draft-ietf-tls-oldversions-deprecate-05
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On Fri, Oct 4, 2019 at 7:43 AM Rob Sayre <sayrer@gmail.com> wrote:

> On Fri, Oct 4, 2019 at 9:08 PM Cullen Jennings <fluffy@iii.ca> wrote:
>
>>
>> I do not think you have consensus for that change to WebRTC - it was
>> discussed extensively. ...
>>
>
>  While that may be true, readers of this list might want to read a
> rationale, rather than just the results of a negotiation. Is there a
> rationale somewhere?
>
> It seems strange to put DTLS 1.0 (based on TLS 1.1) into new documents.
>

A few points.

1. It doesn't pull it in. There's no reference and there's just an
informative statement.
2. There is a rationale. In fact, the relevant text pretty much is all
rationale.

   All Implementations MUST support DTLS 1.2 with the
   TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256 cipher suite and the P-256
   curve [FIPS186
<https://tools.ietf.org/html/draft-ietf-rtcweb-security-arch-20#ref-FIPS186>].
Earlier drafts of this specification required DTLS
   1.0 with the cipher suite TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA, and
   at the time of this writing some implementations do not support DTLS
   1.2; endpoints which support only DTLS 1.2 might encounter
   interoperability issues.

-Ekr

Rob

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