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Re: [Uta] Eric Rescorla's Discuss on draft-ietf-uta-smtp-require-tls-07: (with DISCUSS and COMMENT)

Eric Rescorla <ekr@rtfm.com> Wed, 13 March 2019 21:14 UTC

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From: Eric Rescorla <ekr@rtfm.com>
Date: Wed, 13 Mar 2019 14:13:45 -0700
Message-ID: <CABcZeBP-qzG4c2SX5P3HeDC2P5ChVTDA43MSvQXk1=bxBEr=2A@mail.gmail.com>
To: Alexey Melnikov <aamelnikov@fastmail.fm>
Cc: The IESG <iesg@ietf.org>, uta@ietf.org, uta-chairs@ietf.org, Valery Smyslov <valery@smyslov.net>, draft-ietf-uta-smtp-require-tls@ietf.org
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Subject: Re: [Uta] Eric Rescorla's Discuss on draft-ietf-uta-smtp-require-tls-07: (with DISCUSS and COMMENT)
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On Wed, Mar 13, 2019 at 1:59 PM Alexey Melnikov <aamelnikov@fastmail.fm>
wrote:

> Hi Ekr,
>
> On Thu, Feb 21, 2019, at 3:07 PM, Eric Rescorla wrote:
>
> > ----------------------------------------------------------------------
> > DISCUSS:
> > ----------------------------------------------------------------------
> >
> > I support Benjamin's DISCUSS.
> >
> > To elaborate on one point a bit: it seems to me that it's harmful to
> > security to allow the sender to unilaterally override the recipient's
> > preferences that something be encrypted. To forestall one argument,
> > yes, the sender knows the contents of the message, but the recipient
> > knows their own circumstances, and they may be at particular risk
>
> I don't agree with this part of your DISCUSS and with your argument that
> this is the same as HSTS (I will try to gather my counter-arguments in a
> separate email), but in the interest of being constructive: can you suggest
> a possible fix (or directions towards the fix) to address your DISCUSS?
>

Well, I think this field should only override the outgoing and not incoming
policies (or be removed).

-Ekr


> Thank you,
> Alexey
>

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