Re: (short version) Re: Last Call: <draft-faltstrom-uri-10.txt> (The Uniform Resource Identifier (URI) DNS Resource Record) to Proposed Standard
Viktor Dukhovni <ietf-dane@dukhovni.org> Fri, 27 February 2015 07:58 UTC
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Date: Fri, 27 Feb 2015 07:58:14 +0000
From: Viktor Dukhovni <ietf-dane@dukhovni.org>
To: ietf@ietf.org
Subject: Re: (short version) Re: Last Call: <draft-faltstrom-uri-10.txt> (The Uniform Resource Identifier (URI) DNS Resource Record) to Proposed Standard
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References: <20150223153757.GI1260@mournblade.imrryr.org> <20150223155241.GJ1260@mournblade.imrryr.org> <tsl8ufoh9ko.fsf@mit.edu> <2DF7230C-D1D8-4B21-9003-B336108A38CB@vpnc.org> <20150224172649.GX1260@mournblade.imrryr.org> <tslvbircj0d.fsf@mit.edu> <0325DF3F-17F3-4400-BDEA-EDB5334BF35C@frobbit.se> <20150225180227.GT1260@mournblade.imrryr.org> <tsla901akgu.fsf@mit.edu> <16ABF6B9-F113-4A1F-8816-EE041CCF4C4B@frobbit.se>
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On Fri, Feb 27, 2015 at 08:09:22AM +0100, Patrik F?ltstr?m wrote: > > On 25 feb 2015, at 19:56, Sam Hartman <hartmans-ietf@mit.edu> wrote: > > > > I disagree that SRV or MX introduces similar complexity into standards. > > Sam, I feel I need to understand this. > > For MX, you have to start with a URI like this: > > mailto:paf@frobbit.se MTAs don't work with URIs. Those are for occasional use by MUAs, which don't use MX records. MTAs (as SMTP relays) deliver mail to a nexthop domain to another MTA found in the domain's MX RRset. > One look up the MX for frobbit.se and get mail.frobbit.se Most MTAs servers either do not support TLS at all, or do opportunistic TLS in which there is simply no effort to authenticate the peer. https://tools.ietf.org/draft-ietf-dane-smtp-with-dane-14#section-1.3 That document explains why SMTP transport security is fundamentally dependent on DNS security, and why scalable TLS security for SMTP requires DANE. We accept redirection and detail the consequences. Some MTAs "go though the motions" of pretending to do TLS authentication, but get it wrong by verifying either the hostname from an insecure DNS MX lookup or worse. Other MTAs offer reasonably secure TLS configurations, but this requires that the peer server has the nexthop domain in its certificate or (and generally in any case) bilaterally negotiated security settings. http://www.postfix.org/TLS_README.html#client_tls_limits http://www.postfix.org/TLS_README.html#client_tls_levels http://www.postfix.org/TLS_README.html#client_tls_secure http://www.postfix.org/TLS_README.html#client_tls_policy > One then open an SMTP connection to mail.frobbit.se, and can use TLS where > the cert is compared to mail.frobbit.se. Except that this is not done in MTAs written by people with clue, and is known to be insecure ("going through the motions"). > To me that is a change of a domain name given data in DNS. That's the naive model, but it is wrong. -- Viktor.
- Re: Last Call: <draft-faltstrom-uri-10.txt> (The … Mark Nottingham
- Re: Last Call: <draft-faltstrom-uri-10.txt> (The … Patrik Fältström
- Re: Last Call: <draft-faltstrom-uri-10.txt> (The … Mark Nottingham
- Re: Last Call: <draft-faltstrom-uri-10.txt> (The … Eliot Lear
- Re: Last Call: <draft-faltstrom-uri-10.txt> (The … Patrik Fältström
- Re: Last Call: <draft-faltstrom-uri-10.txt> (The … Patrik Fältström
- Re: Last Call: <draft-faltstrom-uri-10.txt> (The … Eliot Lear
- (short version) Re: Last Call: <draft-faltstrom-u… John C Klensin
- Re: (short version) Re: Last Call: <draft-faltstr… Viktor Dukhovni
- Re: (short version) Re: Last Call: <draft-faltstr… John C Klensin
- Re: (short version) Re: Last Call: <draft-faltstr… Viktor Dukhovni
- Re: (short version) Re: Last Call: <draft-faltstr… Dirk-Willem van Gulik
- Re: Last Call: <draft-faltstrom-uri-10.txt> (The … Patrik Fältström
- Re: (short version) Re: Last Call: <draft-faltstr… Viktor Dukhovni
- Re: (short version) Re: Last Call: <draft-faltstr… Sam Hartman
- Re: (short version) Re: Last Call: <draft-faltstr… Paul Hoffman
- Re: (short version) Re: Last Call: <draft-faltstr… Viktor Dukhovni
- Re: (short version) Re: Last Call: <draft-faltstr… Viktor Dukhovni
- Re: (short version) Re: Last Call: <draft-faltstr… Mark Andrews
- Re: (short version) Re: Last Call: <draft-faltstr… Patrik Fältström
- Re: (short version) Re: Last Call: <draft-faltstr… Sam Hartman
- Re: (short version) Re: Last Call: <draft-faltstr… Pete Resnick
- Re: (short version) Re: Last Call: <draft-faltstr… Patrik Fältström
- Re: (short version) Re: Last Call: <draft-faltstr… Viktor Dukhovni
- Re: (short version) Re: Last Call: <draft-faltstr… John C Klensin
- Re: (short version) Re: Last Call: <draft-faltstr… John C Klensin
- Re: (short version) Re: Last Call: <draft-faltstr… Sam Hartman
- Re: (short version) Re: Last Call: <draft-faltstr… Sam Hartman
- Re: Last Call: <draft-faltstrom-uri-10.txt> (The … Andrew Newton
- Re: (short version) Re: Last Call: <draft-faltstr… Nico Williams
- Re: (short version) Re: Last Call: <draft-faltstr… Nico Williams
- Re: (short version) Re: Last Call: <draft-faltstr… Patrik Fältström
- Re: (short version) Re: Last Call: <draft-faltstr… Nico Williams
- Re: Last Call: <draft-faltstrom-uri-10.txt> (The … Mark Nottingham
- Re: (short version) Re: Last Call: <draft-faltstr… Patrik Fältström
- Re: (short version) Re: Last Call: <draft-faltstr… Viktor Dukhovni
- Re: (short version) Re: Last Call: <draft-faltstr… Patrik Fältström
- Re: (short version) Re: Last Call: <draft-faltstr… Viktor Dukhovni
- Re: (short version) Re: Last Call: <draft-faltstr… Patrik Fältström
- Re: (short version) Re: Last Call: <draft-faltstr… Eliot Lear
- Re: (short version) Re: Last Call: <draft-faltstr… Patrik Fältström
- Re: (short version) Re: Last Call: <draft-faltstr… Eliot Lear
- Re: Last Call: <draft-faltstrom-uri-10.txt> (The … Andrew Newton
- Re: (short version) Re: Last Call: <draft-faltstr… Phillip Hallam-Baker
- Re: (short version) Re: Last Call: <draft-faltstr… Eliot Lear
- Re: Last Call: <draft-faltstrom-uri-10.txt> (The … Andrew Newton
- Re: (short version) Re: Last Call: <draft-faltstr… Eliot Lear
- Re: (short version) Re: Last Call: <draft-faltstr… Sam Hartman
- Re: (short version) Re: Last Call: <draft-faltstr… Sam Hartman
- Re: (short version) Re: Last Call: <draft-faltstr… Sam Hartman
- Re: Last Call: <draft-faltstrom-uri-10.txt> (The … Patrik Fältström
- Re: (short version) Re: Last Call: <draft-faltstr… Pete Resnick
- Re: (short version) Re: Last Call: <draft-faltstr… Nico Williams
- Re: (short version) Re: Last Call: <draft-faltstr… Viktor Dukhovni
- Re: (short version) Re: Last Call: <draft-faltstr… Nico Williams
- draft-newton-link-rr (was Re: Last Call: <draft-f… Nico Williams
- Re: draft-newton-link-rr (was Re: Last Call: <dra… Nico Williams
- Re: (short version) Re: Last Call: <draft-faltstr… Mark Andrews
- Re: (short version) Re: Last Call: <draft-faltstr… Phillip Hallam-Baker
- Re: (short version) Re: Last Call: <draft-faltstr… Viktor Dukhovni
- Re: (short version) Re: Last Call: <draft-faltstr… Mark Andrews
- Re: (short version) Re: Last Call: <draft-faltstr… Phillip Hallam-Baker
- Re: (short version) Re: Last Call: <draft-faltstr… Sam Hartman
- Re: Last Call: <draft-faltstrom-uri-10.txt> (The … Patrik Fältström
- Re: draft-newton-link-rr (was Re: Last Call: <dra… Patrik Fältström
- Re: (short version) Re: Last Call: <draft-faltstr… Viktor Dukhovni
- Re: draft-newton-link-rr (was Re: Last Call: <dra… Andrew Newton
- Re: (short version) Re: Last Call: <draft-faltstr… John C Klensin
- Re: (short version) Re: Last Call: <draft-faltstr… Viktor Dukhovni
- Re: draft-newton-link-rr (was Re: Last Call: <dra… Patrik Fältström
- Re: Last Call: <draft-faltstrom-uri-10.txt> (The … Mark Andrews
- Re: (short version) Re: Last Call: <draft-faltstr… Mark Nottingham
- Re: (short version) Re: Last Call: <draft-faltstr… Patrik Fältström
- Re: (short version) Re: Last Call: <draft-faltstr… Mark Nottingham
- Re: (short version) Re: Last Call: <draft-faltstr… Pete Resnick
- Re: (short version) Re: Last Call: <draft-faltstr… Pete Resnick
- Re: (short version) Re: Last Call: <draft-faltstr… Viktor Dukhovni
- Re: (short version) Re: Last Call: <draft-faltstr… Patrik Fältström
- Re: (short version) Re: Last Call: <draft-faltstr… Sam Hartman
- Re: (short version) Re: Last Call: <draft-faltstr… Viktor Dukhovni
- Re: (short version) Re: Last Call: <draft-faltstr… Eliot Lear
- Re: (short version) Re: Last Call: <draft-faltstr… Pete Resnick
- Re: (short version) Re: Last Call: <draft-faltstr… Viktor Dukhovni
- Re: (short version) Re: Last Call: <draft-faltstr… Sam Hartman
- Re: (short version) Re: Last Call: <draft-faltstr… Sam Hartman
- Re: (short version) Re: Last Call: <draft-faltstr… John C Klensin
- Re: (short version) Re: Last Call: <draft-faltstr… John C Klensin
- Re: (short version) Re: Last Call: <draft-faltstr… John C Klensin
- Re: (short version) Re: Last Call: <draft-faltstr… John C Klensin
- Re: (short version) Re: Last Call: <draft-faltstr… John C Klensin
- Re: (short version) Re: Last Call: <draft-faltstr… John C Klensin
- Re: (short version) Re: Last Call: <draft-faltstr… Eliot Lear
- Re: (short version) Re: Last Call: <draft-faltstr… Eliot Lear
- Re: (short version) Re: Last Call: <draft-faltstr… Nico Williams
- Re: (short version) Re: Last Call: <draft-faltstr… Patrik Fältström
- Re: (short version) Re: Last Call: <draft-faltstr… Patrik Fältström
- Re: (short version) Re: Last Call: <draft-faltstr… Patrik Fältström
- Re: (short version) Re: Last Call: <draft-faltstr… Pete Resnick
- Re: (short version) Re: Last Call: <draft-faltstr… Pete Resnick
- Where to do the work was Re: (short version) Re: … t.p.
- Re: (short version) Re: Last Call: <draft-faltstr… Patrik Fältström