Re: [yam] Interop problem: SMTP submission, STARTTLS, AUTH EXTERNAL
Tony Hansen <tony@att.com> Thu, 06 May 2010 12:42 UTC
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Date: Thu, 06 May 2010 08:41:16 -0400
From: Tony Hansen <tony@att.com>
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Subject: Re: [yam] Interop problem: SMTP submission, STARTTLS, AUTH EXTERNAL
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I think this is totally an issue with AUTH EXTERNAL and worth mention in an update to that spec. However, I don't think it directly affects 4409bis. Any other people's thoughts? Tony Hansen tony@att.com On 5/2/2010 8:55 AM, Alessandro Vesely wrote: > Chris Newman wrote: >> >> Option 1: relevant to YAM -- Clarify 4409 section 4.3 to state that >> providing client authentication during TLS does not constitute >> "independently established authentication" [...] >> >> Pros: [...] Consistent with IMAP+STARTTLS and POP+STARTTLS. > > Even if SUBMIT mandates authentication, it inherits the SMTP trust > model, which is different from that of IMAP and POP. Section 4.3 just > allows such compatibility. An historical trait. > >> Option 2: Incompatible change to RFC 3207 (SMTP STARTTLS) when an >> SMTP client provides a client certificate the server deems valid for >> authentication purposes, the server MUST enable the SASL EXTERNAL >> mechanism (advertising it in EHLO and allowing it in AUTH). If the >> client issues "MAIL FROM" without issuing an AUTH command in this >> situation, the server MUST behave as if an implicit "AUTH EXTERNAL =" >> was issued by the client. > > This option may cause difficulties with the paragraph in rfc 4954 that > says > > Restrictions: > After an AUTH command has been successfully completed, no more > AUTH commands may be issued in the same session. After a > successful AUTH command completes, a server MUST reject any > further AUTH commands with a 503 reply. > > In case an implicit "AUTH EXTERNAL =" had been assumed by the server > when a previous transaction started, the client cannot repeat it for > the whole session. For an MTA, non-authenticated transactions are > allowed, so it may be unclear whether the server should assume it in > any case. > > I note that SMTP-AUTH does not allow a client to query its current > authentication state, nor to learn what authorizations such state > implies (e.g. relaying, specifying trusted AUTH parameters.) I think > the problem you describe results from that design. > > I'd agree if rfc4409bis will informatively mention that "AUTH EXTERNAL > =" may be used by a client to check the status of an independently > established authentication --in case the server has such mechanism. > Additionally, section 3.3 may want to mention client TLS certificates. > Would that bring any good?
- [yam] Interop problem: SMTP submission, STARTTLS,… Chris Newman
- Re: [yam] Interop problem: SMTP submission, START… John R. Levine
- Re: [yam] Interop problem: SMTP submission, START… Tony Finch
- Re: [yam] Interop problem: SMTP submission, START… Alessandro Vesely
- Re: [yam] Interop problem: SMTP submission, START… Tony Hansen
- Re: [yam] Interop problem: SMTP submission, START… Arnt Gulbrandsen
- Re: [yam] Interop problem: SMTP submission, START… John R. Levine
- Re: [yam] Interop problem: SMTP submission, START… John C Klensin
- Re: [yam] Interop problem: SMTP submission, START… John C Klensin
- Re: [yam] Interop problem: SMTP submission, START… Chris Newman
- Re: [yam] Interop problem: SMTP submission, START… John R. Levine
- Re: [yam] Interop problem: SMTP submission, START… SM
- Re: [yam] Interop problem: SMTP submission, START… Ned Freed
- Re: [yam] Interop problem: SMTP submission, START… Tony Hansen
- Re: [yam] Interop problem: SMTP submission, START… Arnt Gulbrandsen