Re: [dane] email canonicalization for SMIMEA owner names
Alexey Melnikov <alexey.melnikov@isode.com> Fri, 12 December 2014 17:01 UTC
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Date: Fri, 12 Dec 2014 17:01:22 +0000
From: Alexey Melnikov <alexey.melnikov@isode.com>
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To: Ben Laurie <benl@google.com>
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Cc: Paul Wouters <paul@nohats.ca>, dane WG list <dane@ietf.org>
Subject: Re: [dane] email canonicalization for SMIMEA owner names
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On 12/12/2014 16:28, Ben Laurie wrote: > On 12 December 2014 at 15:56, Alexey Melnikov <alexey.melnikov@isode.com> wrote: >> On 12/12/2014 15:38, Paul Wouters wrote: >>> Whoever starts using variant email addresses should publish records for >>> it? As John said, clients shouldn't start guessing addressing schemes used >>> by others >> +1. Nobody other than the final MTA/MDA knows that certain forms are >> equivalent. > True, but does not make your scheme workable. Only publish canonical form or variants that were used for sending emails out? >>> Sent from my iPhone >>> >>>> On Dec 12, 2014, at 06:37, Ben Laurie <benl@google.com> wrote: >>>> >>>>> On 11 December 2014 at 19:51, Rose, Scott W. <scott.rose@nist.gov> >>>>> wrote: >>>>> Realized the other action item I was assigned to from the interim >>>>> meeting was email canonicalization for SMIMEA. I believe it stems from >>>>> Viktor Dukhovni's email to the endymail list: >>>>> http://www.ietf.org/mail-archive/web/endymail/current/msg00134.html >>>>> >>>>> I was wondering if we can borrow a page from RFC 4034 Section 6.2 and >>>>> include text in the draft Section 3, item 1 in the numbered list: >>>>> >>>>> 1. The user name (the "left-hand side" of the email address, >>>>> called >>>>> the "local-part" in the mail message format definition [RFC2822] >>>>> and the "local part" in the specification for internationalized >>>>> email [RFC6530]), is hashed using the SHA2-224 [RFC5754] >>>>> algorithm (with the hash being represented in its hexadecimal >>>>> representation, to become the left-most label in the prepared >>>>> domain name. This does not include the "@" character that >>>>> separates the left and right sides of the email address. The >>>>> string that is used for the local part is a Unicode string >>>>> encoded in UTF-8 **with all upper case letters converted to their >>>>> corresponding lower case letters where appropriate.** >>>>> >>>>> >>>>> The text between the '**' is new. The goal is to prevent a situation >>>>> when the email address is "JRandom@example.com" and the SMIMEA is created >>>>> using "jrandom" as the user name. Would this be enough, or are there >>>>> scripts where this would result in different or potentially conflicting >>>>> owner names? >>>> Speaking of canonicalisation: >>>> >>>> 1. What about X+Y@Z - for almost all MTAs, this is the same as X@Z. >>>> >>>> 2. What about GMail's a.b.c@gmail.com == abc@gmail.com == >>>> ab.c@gmail.com == a.bc@gmail.com? >>
- Re: [dane] email canonicalization for SMIMEA owne… Nico Williams
- [dane] email canonicalization for SMIMEA owner na… Rose, Scott W.
- Re: [dane] email canonicalization for SMIMEA owne… Ian Fette (イアンフェッティ)
- Re: [dane] email canonicalization for SMIMEA owne… Viktor Dukhovni
- Re: [dane] email canonicalization for SMIMEA owne… Nico Williams
- Re: [dane] email canonicalization for SMIMEA owne… Christian Rößner
- Re: [dane] email canonicalization for SMIMEA owne… John Levine
- Re: [dane] email canonicalization for SMIMEA owne… John Levine
- Re: [dane] email canonicalization for SMIMEA owne… Viktor Dukhovni
- Re: [dane] email canonicalization for SMIMEA owne… Mark Andrews
- Re: [dane] email canonicalization for SMIMEA owne… Viktor Dukhovni
- Re: [dane] email canonicalization for SMIMEA owne… Mark Andrews
- Re: [dane] email canonicalization for SMIMEA owne… Viktor Dukhovni
- Re: [dane] email canonicalization for SMIMEA owne… Mark Andrews
- Re: [dane] email canonicalization for SMIMEA owne… Ian Fette (イアンフェッティ)
- Re: [dane] email canonicalization for SMIMEA owne… Viktor Dukhovni
- Re: [dane] email canonicalization for SMIMEA owne… Paul Wouters
- Re: [dane] email canonicalization for SMIMEA owne… Paul Wouters
- Re: [dane] email canonicalization for SMIMEA owne… Nico Williams
- Re: [dane] email canonicalization for SMIMEA owne… Nico Williams
- Re: [dane] email canonicalization for SMIMEA owne… Nico Williams
- Re: [dane] email canonicalization for SMIMEA owne… John Levine
- Re: [dane] email canonicalization for SMIMEA owne… Mark Andrews
- Re: [dane] email canonicalization for SMIMEA owne… Nico Williams
- Re: [dane] email canonicalization for SMIMEA owne… Ben Laurie
- Re: [dane] email canonicalization for SMIMEA owne… Jakob Schlyter
- Re: [dane] email canonicalization for SMIMEA owne… Paul Wouters
- Re: [dane] email canonicalization for SMIMEA owne… Alexey Melnikov
- Re: [dane] email canonicalization for SMIMEA owne… Alexey Melnikov
- Re: [dane] email canonicalization for SMIMEA owne… Paul Wouters
- Re: [dane] email canonicalization for SMIMEA owne… Nico Williams
- Re: [dane] email canonicalization for SMIMEA owne… Ben Laurie
- Re: [dane] email canonicalization for SMIMEA owne… Alexey Melnikov
- Re: [dane] email canonicalization for SMIMEA owne… Viktor Dukhovni
- Re: [dane] email canonicalization for SMIMEA owne… John Levine
- Re: [dane] email canonicalization for SMIMEA owne… Nico Williams
- Re: [dane] email canonicalization for SMIMEA owne… James Cloos
- Re: [dane] email canonicalization for SMIMEA owne… Viktor Dukhovni
- Re: [dane] email canonicalization for SMIMEA owne… John Levine
- Re: [dane] email canonicalization for SMIMEA owne… Viktor Dukhovni
- Re: [dane] email canonicalization for SMIMEA owne… James Cloos
- Re: [dane] email canonicalization for SMIMEA owne… John Levine
- Re: [dane] email canonicalization for SMIMEA owne… Viktor Dukhovni