Re: [apps-discuss] Slash and version number in Authentication-results: header field (was: I-D Action: draft-ietf-appsawg-rfc5451bis-02.txt)
Scott Kitterman <scott@kitterman.com> Mon, 20 May 2013 08:45 UTC
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From: Scott Kitterman <scott@kitterman.com>
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Date: Mon, 20 May 2013 04:04:36 -0400
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Subject: Re: [apps-discuss] Slash and version number in Authentication-results: header field (was: I-D Action: draft-ietf-appsawg-rfc5451bis-02.txt)
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On Monday, May 20, 2013 12:14:06 AM S Moonesamy wrote: > Hi Alexey, > > Scott Kitterman mentioned [1] that the following: > > authres-header = "Authentication-Results:" [CFWS] authserv-id > [ [CFWS] "/" [CFWS] authres-version ] > > 'is an incompatible change and if you really want to make it, you should > bump the version number. I checked and with authres, your example is > mis-parsed. > > Authentication-Results: example.org/1; none > > In this example, the authserv-id is "example.org", but authres, using the > RFC 5451 ABNF parses this and determines the authserv-id is > "example.org/1"' > > Murray Kucherawy commented that he has "yet to see a single > implementation that includes a version number in its output, though > there are some that do look for it" [2]. John Levine responded that > his implementation does [3]. He also mentioned that the introduction > of the slash (see ABNF) creates an incompatibility. > > There is also the following in Section 5 of > draft-ietf-appsawg-rfc5451bis-02: > > "An MTA SHOULD remove any instance of this header field bearing a > version (express or implied) that it does not support." > > Will the addition of the slash cause an interoperability issue? > > Regards, > S. Moonesamy > > 1. http://www.ietf.org/mail-archive/web/apps-discuss/current/msg09460.html > 2. http://www.ietf.org/mail-archive/web/apps-discuss/current/msg09463.html > 3. http://www.ietf.org/mail-archive/web/apps-discuss/current/msg09465.html If an implementation based on 5451 receives a future 5451bis header field with an authserv-id of example.com and a version number of 2, it would read that as an authserv-id of example.com/2 and an implicit version number of 1. Both getting the version number wrong and the authserv-id wrong could have interoperability implications. Scott K
- [apps-discuss] I-D Action: draft-ietf-appsawg-rfc… internet-drafts
- Re: [apps-discuss] I-D Action: draft-ietf-appsawg… Scott Kitterman
- Re: [apps-discuss] I-D Action: draft-ietf-appsawg… Murray S. Kucherawy
- Re: [apps-discuss] I-D Action: draft-ietf-appsawg… John Levine
- Re: [apps-discuss] I-D Action: draft-ietf-appsawg… Murray S. Kucherawy
- Re: [apps-discuss] I-D Action: draft-ietf-appsawg… John R Levine
- [apps-discuss] Slash and version number in Authen… S Moonesamy
- Re: [apps-discuss] Slash and version number in Au… Scott Kitterman
- Re: [apps-discuss] Slash and version number in Au… Alexey Melnikov
- Re: [apps-discuss] Slash and version number in Au… Dave Cridland
- Re: [apps-discuss] Slash and version number in Au… Dave Cridland
- Re: [apps-discuss] Slash and version number in Au… Scott Kitterman
- Re: [apps-discuss] Slash and version number in Au… Dave Cridland
- Re: [apps-discuss] I-D Action: draft-ietf-appsawg… Alessandro Vesely
- Re: [apps-discuss] I-D Action: draft-ietf-appsawg… John Levine
- Re: [apps-discuss] I-D Action: draft-ietf-appsawg… Dave Crocker
- Re: [apps-discuss] I-D Action: draft-ietf-appsawg… Barry Leiba
- Re: [apps-discuss] I-D Action: draft-ietf-appsawg… Dave Crocker
- Re: [apps-discuss] I-D Action: draft-ietf-appsawg… John R Levine
- Re: [apps-discuss] I-D Action: draft-ietf-appsawg… Murray S. Kucherawy