Re: [Extra] Secdir last call review of draft-ietf-extra-imap4rev2-24

Daniel Migault <daniel.migault@ericsson.com> Thu, 04 February 2021 13:53 UTC

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From: Daniel Migault <daniel.migault@ericsson.com>
To: Alexey Melnikov <alexey.melnikov@isode.com>, "secdir@ietf.org" <secdir@ietf.org>
CC: "draft-ietf-extra-imap4rev2.all@ietf.org" <draft-ietf-extra-imap4rev2.all@ietf.org>, "extra@ietf.org" <extra@ietf.org>, "last-call@ietf.org" <last-call@ietf.org>
Thread-Topic: Secdir last call review of draft-ietf-extra-imap4rev2-24
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Date: Thu, 4 Feb 2021 13:53:37 +0000
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Subject: Re: [Extra] Secdir last call review of draft-ietf-extra-imap4rev2-24
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Hi,

I do see your point. My point here was more to point there exists some alternatives that worth being considered and might be developed in the future. I agree this might require more work than I am currently thinking of. I do not know how biased I am toward DANE, so I let you do what you think is best.

Yours,
Daniel



________________________________
From: Alexey Melnikov <alexey.melnikov@isode.com>
Sent: Sunday, January 24, 2021 7:50 AM
To: Daniel Migault <daniel.migault@ericsson.com>om>; secdir@ietf.org <secdir@ietf.org>
Cc: draft-ietf-extra-imap4rev2.all@ietf.org <draft-ietf-extra-imap4rev2.all@ietf.org>rg>; extra@ietf.org <extra@ietf.org>rg>; last-call@ietf.org <last-call@ietf.org>
Subject: Re: Secdir last call review of draft-ietf-extra-imap4rev2-24

Hi Daniel,

On 19/01/2021 14:52, Daniel Migault via Datatracker wrote:

  [snip]

>     During the TLS negotiation [TLS-1.3][TLS-1.2], the client MUST check
>     its understanding of the server hostname against the server's
>     identity as presented in the server Certificate message, in order to
>     prevent man-in-the-middle attacks.  This procedure is described in
>     [RFC7817].
>
> <mglt>
> I think it would be good to mention DANE as
> well as certificate checks.

This came up before, but at this point there is no document describing
how to use DANE with email clients (an alternative/update to RFC 7817)
and I am not aware of any client implementations that use DANE
experimentally for this.

Best Regards,

Alexey