Re: [dane] email canonicalization for SMIMEA owner names
Ben Laurie <benl@google.com> Fri, 12 December 2014 16:28 UTC
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Date: Fri, 12 Dec 2014 16:28:34 +0000
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From: Ben Laurie <benl@google.com>
To: Alexey Melnikov <alexey.melnikov@isode.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 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. > >> 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