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Re: [Spasm] Last Call: <draft-ietf-lamps-eai-addresses-05.txt> (Internationalized Email Addresses in X.509 certificates) to Proposed Standard

Wei Chuang <weihaw@google.com> Thu, 09 March 2017 01:17 UTC

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From: Wei Chuang <weihaw@google.com>
Date: Wed, 08 Mar 2017 17:17:15 -0800
Message-ID: <CAAFsWK3yJ9r+6abTXZQsNsey+VcRpdtVv=Hku_54_LZ9y1T2xQ@mail.gmail.com>
To: Viktor Dukhovni <ietf-dane@dukhovni.org>
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Subject: Re: [Spasm] Last Call: <draft-ietf-lamps-eai-addresses-05.txt> (Internationalized Email Addresses in X.509 certificates) to Proposed Standard
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Okay.  I think the direction then is to have SmtpUTF8Name respect
rfc822Name name constraints and vice versa.

-Wei

On Wed, Mar 8, 2017 at 3:27 PM, Viktor Dukhovni <ietf-dane@dukhovni.org>
wrote:

>
> > On Mar 8, 2017, at 6:07 PM, Wei Chuang <weihaw@google.com> wrote:
> >
> > https://tools.ietf.org/rfcdiff?url2=draft-ietf-lamps-
> eai-addresses-07.txt
>
> This diff covers a lot more than just name constraints.  One oddity that
> stands out is in section 5:
>
>         3.  Ensure local-part is UTF-8.
>
> I don't see how one would "ensure" such a thing, since no encoding
> information is available for the localpart, is I would expect that
> is always presumptively UTF-8 (if not us-ascii).
>
> More importantly I don't believe that the name constraint issues are
> adequately or correctly addressed in this revision.
>
> Instead of prohibiting issuance of EE certs that HAVE SmtpUTF8Name SAN
> elements via a cert chain that has a certificate with *just* rfc822Name
> constraints, it attempts to require an unnecessary (and I think not
> entirely robust) correspondence between the two types constraint, and
> needlessly bans EE certs whose chains include just rfc822Name constraints
> even in the absence of SmtpUTF8Name SAN elements.
>
> The changes in this revision seem to me to be too extensive, and not
> yet finished. :-(
>
> --
>         Viktor.
>
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