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Re: [dane] Feature creep for draft-ietf-dane-smime

Tom Ritter <tom@ritter.vg> Fri, 07 February 2014 11:11 UTC

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From: Tom Ritter <tom@ritter.vg>
Date: Fri, 07 Feb 2014 05:56:12 -0500
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To: IETF DANE WG list <dane@ietf.org>
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Subject: Re: [dane] Feature creep for draft-ietf-dane-smime
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On 6 February 2014 21:02, Viktor Dukhovni <viktor1dane@dukhovni.org> wrote:
> I am not strongly advocating for this, more thinking out loud, in
> case the issue resonates with the group.

I saw it mentioned, but when I ran into a similar situation, I got
hung up with the normalization/canonicalization process.
Capitalization ('Mark' vs 'mark') and in other languages and Suffixes
(tom-ietf@ritter.vg vs tom+ietf@ritter.vg and other configurable
characters) being the foremost.

No hashing allows a server to go to lengths to set up a DNS response
that matches their implementation (e.g. perhaps my suffix character is
'G') - hashing either takes that ability away from servers or creates
a way-too-complicated algorithm with unacceptable back-and-forth 'What
is your suffix character' queries.

I lean away from hashing, in favor of robust anti-spam solutions that
take into account things like sender DKIM and SMIME. That said, I also
recognize the value in trying not to decrease security (actual or
perceived) from what is actually deployed milter software.

-tom

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