Re: [DNSOP] [perpass] draft-hzhwm-start-tls-for-dns-00: Starting TLS over DNS

Watson Ladd <watsonbladd@gmail.com> Sat, 15 February 2014 16:44 UTC

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Date: Sat, 15 Feb 2014 08:44:27 -0800
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From: Watson Ladd <watsonbladd@gmail.com>
To: Stephane Bortzmeyer <bortzmeyer@nic.fr>
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Cc: dnsop@ietf.org, Paul Vixie <paul@redbarn.org>, perpass@ietf.org, Zi Hu <zihu@usc.edu>
Subject: Re: [DNSOP] [perpass] draft-hzhwm-start-tls-for-dns-00: Starting TLS over DNS
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Dear all,
This proposal has multiple shortcomings compared to DNSCurve.

First off, it says that the rationale for TLS over DNSCurve is simply
to "take advantage of TLS". I would respectfully submit that DJB can
do a better job than the TLS committee, and did. Merely adding bolts
and nuts onto a design is not improving it.

Secondly, this proposal only works on TCP. This imposes latency and
state requirements that most people would rather avoid. The use of
keepalive only addresses computational burden, not state burden, and
with the DH speed records we have today unnecessary.

Thirdly, this proposal ignores entirely how to validate the server
over the TLS connection. Does it need a certificate? Who should be
allowed to sign it? How should it be validated? DNSSEC provides a PKI,
and this proposal provides another one. Their interactions will not be
fun.

Fourthly, there is substantial operational knowledge and deployed,
working, code implementing DNSCurve. This does not hold for this
proposal.

Sincerely,
Watson Ladd