Re: Last Call: <draft-ietf-lamps-eai-addresses-05.txt> (Internationalized Email Addresses in X.509 certificates) to Proposed Standard
Viktor Dukhovni <ietf-dane@dukhovni.org> Thu, 09 February 2017 22:39 UTC
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Date: Thu, 09 Feb 2017 22:39:51 +0000
From: Viktor Dukhovni <ietf-dane@dukhovni.org>
To: ietf@ietf.org
Subject: Re: Last Call: <draft-ietf-lamps-eai-addresses-05.txt> (Internationalized Email Addresses in X.509 certificates) to Proposed Standard
Message-ID: <20170209223951.GW28349@mournblade.imrryr.org>
References: <CAAFsWK2QjdkovXTgJR-6Hpj=u=MD5Mjk0srYVpoqNnK_d7_Y9Q@mail.gmail.com> <78EFB6CA-BB21-4B6F-964C-9A0BBAA68023@dukhovni.org> <CAAFsWK0p5Zjj73Av3Z=TpjRmpJwFekfj9N+4zdcE_fFDcw65dA@mail.gmail.com> <20170206182023.GN28349@mournblade.imrryr.org> <20170208051311.GP28349@mournblade.imrryr.org> <CAAFsWK3xY35+yD5drtmUJUNMaAA8pRUwM3h22rvm+k7g5W8uKg@mail.gmail.com> <20170208151943.GQ28349@mournblade.imrryr.org> <CAAFsWK20Sf51W+cRUBET8-U5XXO+Z1ixOt3dgu70ad99FPsrWg@mail.gmail.com> <20170209175737.GV28349@mournblade.imrryr.org> <EB04BFE1-6A74-4697-9D4F-67A356B107DE@vigilsec.com>
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On Thu, Feb 09, 2017 at 04:33:44PM -0500, Russ Housley wrote: > RFC 5280 says: > > A name constraint for Internet mail addresses MAY specify a > particular mailbox, all addresses at a particular host, or all > mailboxes in a domain. To indicate a particular mailbox, the > constraint is the complete mail address. For example, > "root@example.com" indicates the root mailbox on the host > "example.com". To indicate all Internet mail addresses on a > particular host, the constraint is specified as the host name. For > example, the constraint "example.com" is satisfied by any mail > address at the host "example.com". To specify any address within a > domain, the constraint is specified with a leading period (as with > URIs). For example, ".example.com" indicates all the Internet mail > addresses in the domain "example.com", but not Internet mail > addresses on the host "example.com”. > > I think you are talking about constraints on addresses at a particular > host and constraints on mailboxes in a domain, but not constraints on a > particular mailbox. Please correct me is I got that wrong. Primarily, but not exclusively. In the case that an issuer CA is constrainted to a specific rfc822Name, it should not be possible to evade that constraint by using the same (all-ASCII) address as an SmtpUtf8Name. > I think you are suggesting that any A-label in the rfc822Name be converted > to a U-label, and the result is used to constrain the SmtpUtf8Name. No. I am *not* suggesting *any* conversions. If a CA has rfc822Name constraints and no SmptUtf8Name constraints, and the rfc822Name constraints limit the CA to "example.com", ".example.com", or as you suggest above, a particular set of explicit rfc822Name addresses, my suggestion is that it MUST NOT be able to issue SmtpUtf8Name altnames that violate those constraints. For example: * CA is constrained to permitted subtree rfc822Name: example.com - can issue SmtpUtfName: виктор@example.com - cannot issue SmtpUtf8Name: виктор@example.net In the current form of the draft both would be allowed, the second is a clear violation of the principle of least surprise (and the policy of the parent CA that created the name constraint). > If people like your suggestion, then a constraint for a particular mailbox > will still require a SmtpUtf8Name, so I think the mechanism described in > the draft is needed. It would just be used in combination with the above. As to particular addresses, again: * CA is constrained to permitted subtree rfc822Name: viktor@example.com - cannot SmtpUtfName: виктор@example.com - cannot issue SmtpUtf8Name: виктор@example.net In the current form of the draft both would be allowed, in clear violation of the name constraint on the permitted email addresses. -- Viktor.
- Re: Last Call: <draft-ietf-lamps-eai-addresses-05… John C Klensin
- Re: Last Call: <draft-ietf-lamps-eai-addresses-05… Alexey Melnikov
- Re: Last Call: <draft-ietf-lamps-eai-addresses-05… Patrik Fältström
- Re: Last Call: <draft-ietf-lamps-eai-addresses-05… John C Klensin
- Re: Last Call: <draft-ietf-lamps-eai-addresses-05… Patrik Fältström
- Re: Last Call: <draft-ietf-lamps-eai-addresses-05… John Levine
- Re: Last Call: <draft-ietf-lamps-eai-addresses-05… John C Klensin
- Re: Last Call: <draft-ietf-lamps-eai-addresses-05… Patrik Fältström
- Re: Last Call: <draft-ietf-lamps-eai-addresses-05… Viktor Dukhovni
- Re: Last Call: <draft-ietf-lamps-eai-addresses-05… John C Klensin
- Re: Last Call: <draft-ietf-lamps-eai-addresses-05… John R Levine
- Re: Last Call: <draft-ietf-lamps-eai-addresses-05… John C Klensin
- Re: Last Call: <draft-ietf-lamps-eai-addresses-05… John Levine
- Re: Last Call: <draft-ietf-lamps-eai-addresses-05… Viktor Dukhovni
- Re: Last Call: <draft-ietf-lamps-eai-addresses-05… John C Klensin
- Re: Last Call: <draft-ietf-lamps-eai-addresses-05… Viktor Dukhovni
- Re: Last Call: <draft-ietf-lamps-eai-addresses-05… John Levine
- Re: Last Call: <draft-ietf-lamps-eai-addresses-05… Wei Chuang
- Re: Last Call: <draft-ietf-lamps-eai-addresses-05… Viktor Dukhovni
- Re: Last Call: <draft-ietf-lamps-eai-addresses-05… Wei Chuang
- Re: Last Call: <draft-ietf-lamps-eai-addresses-05… Viktor Dukhovni
- Diversity, writing systems, identifiers, and prot… John C Klensin
- Re: Last Call: <draft-ietf-lamps-eai-addresses-05… Wei Chuang
- Re: Last Call: <draft-ietf-lamps-eai-addresses-05… Viktor Dukhovni
- Re: Last Call: <draft-ietf-lamps-eai-addresses-05… Viktor Dukhovni
- Re: Last Call: <draft-ietf-lamps-eai-addresses-05… John C Klensin
- Re: Last Call: <draft-ietf-lamps-eai-addresses-05… Wei Chuang
- Re: Last Call: <draft-ietf-lamps-eai-addresses-05… Viktor Dukhovni
- Re: Last Call: <draft-ietf-lamps-eai-addresses-05… Wei Chuang
- Re: Last Call: <draft-ietf-lamps-eai-addresses-05… Viktor Dukhovni
- Re: Last Call: <draft-ietf-lamps-eai-addresses-05… Viktor Dukhovni
- Re: Last Call: <draft-ietf-lamps-eai-addresses-05… Russ Housley
- Re: Last Call: <draft-ietf-lamps-eai-addresses-05… Viktor Dukhovni
- Re: Last Call: <draft-ietf-lamps-eai-addresses-05… Russ Housley
- Re: Last Call: <draft-ietf-lamps-eai-addresses-05… Viktor Dukhovni
- Re: Last Call: <draft-ietf-lamps-eai-addresses-05… Russ Housley
- Re: Last Call: <draft-ietf-lamps-eai-addresses-05… Russ Housley
- Re: Last Call: <draft-ietf-lamps-eai-addresses-05… Russ Housley
- Re: Last Call: <draft-ietf-lamps-eai-addresses-05… Russ Housley
- Re: Last Call: <draft-ietf-lamps-eai-addresses-05… Viktor Dukhovni
- Re: Last Call: <draft-ietf-lamps-eai-addresses-05… John R. Levine
- Re: Last Call: <draft-ietf-lamps-eai-addresses-05… Wei Chuang
- Re: Last Call: <draft-ietf-lamps-eai-addresses-05… Viktor Dukhovni
- Re: Last Call: <draft-ietf-lamps-eai-addresses-05… Stephen Farrell
- RE: [Spasm] Last Call: <draft-ietf-lamps-eai-addr… Jim Schaad
- RE: [Spasm] Last Call: <draft-ietf-lamps-eai-addr… John C Klensin
- Re: Last Call: <draft-ietf-lamps-eai-addresses-05… Wei Chuang
- Re: Last Call: <draft-ietf-lamps-eai-addresses-05… Viktor Dukhovni
- Re: Last Call: <draft-ietf-lamps-eai-addresses-05… Russ Housley
- Re: Last Call: <draft-ietf-lamps-eai-addresses-05… Viktor Dukhovni
- Re: Last Call: <draft-ietf-lamps-eai-addresses-05… Stephen Farrell
- Re: [Spasm] Last Call: <draft-ietf-lamps-eai-addr… Wei Chuang
- Re: [Spasm] Last Call: <draft-ietf-lamps-eai-addr… Viktor Dukhovni
- Re: [Spasm] Last Call: <draft-ietf-lamps-eai-addr… Wei Chuang
- Re: [Spasm] Last Call: <draft-ietf-lamps-eai-addr… Viktor Dukhovni
- Re: [Spasm] Last Call: <draft-ietf-lamps-eai-addr… tom p.
- Re: [Spasm] Last Call: <draft-ietf-lamps-eai-addr… Wei Chuang
- Re: [Spasm] Last Call: <draft-ietf-lamps-eai-addr… Wei Chuang