Re: [dane] Digest Algorithm Agility discussion
Peter Palfrader <peter@palfrader.org> Mon, 24 March 2014 15:34 UTC
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Date: Mon, 24 Mar 2014 16:33:58 +0100
From: Peter Palfrader <peter@palfrader.org>
To: Paul Wouters <paul@nohats.ca>
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References: <20140323174205.63C6111B2111@rock.dv.isc.org> <20140323182106.GX24183@mournblade.imrryr.org> <20140323185718.7A84711B2CB8@rock.dv.isc.org> <20140323191037.GA1469@anguilla.noreply.org> <20140323192557.7716111B342A@rock.dv.isc.org> <20140323200008.GB1469@anguilla.noreply.org> <20140323202831.GB13649@mournblade.imrryr.org> <20140323230125.EF23411B4816@rock.dv.isc.org> <20140323235727.GC13649@mournblade.imrryr.org> <alpine.LFD.2.10.1403241052240.18937@bofh.nohats.ca>
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Subject: Re: [dane] Digest Algorithm Agility discussion
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On Mon, 24 Mar 2014, Paul Wouters wrote: > On Sun, 23 Mar 2014, Viktor Dukhovni wrote: > > >when the TLSA records are entirely unusable, and in keeping with Tony's > >original work on the SRV draft, the client reverts to legacy > >mandatory (practically always unauthenticated) TLS. > > That's unfortunate. Perhaps it depends on the definition of "unusable", > but if all TLSA records for instance fail the RRSIG validation, I would > hope that postfix would abort delivery attempts and definately _not_ > fallback to unauthenticated TLS. 2.1. of draft-ietf-dane-smtp-with-dane-07: } When a DNS lookup failure (error or "bogus" or "indeterminate" as } defined above) prevents an SMTP client from determining which SMTP } server or servers it should connect to, message delivery MUST be } delayed. Unusable thus would mean we don't know or like the digest type, or usage, selector, or matching type. The 07 dane smtp draft further says: } A Secure non-empty TLSA RRset where all the records are unusable: A } connection to the MTA MUST be made via TLS, but authentication is } not required. Failure to establish an encrypted TLS connection } MUST result in falling back to the next SMTP server or delayed } delivery. Cheers, -- | .''`. ** Debian ** Peter Palfrader | : :' : The universal http://www.palfrader.org/ | `. `' Operating System | `- http://www.debian.org/
- [dane] Digest Algorithm Agility discussion Viktor Dukhovni
- Re: [dane] Digest Algorithm Agility discussion Paul Wouters
- Re: [dane] Digest Algorithm Agility discussion Viktor Dukhovni
- Re: [dane] Digest Algorithm Agility discussion Paul Hoffman
- Re: [dane] Digest Algorithm Agility discussion Paul Wouters
- Re: [dane] Digest Algorithm Agility discussion Viktor Dukhovni
- Re: [dane] Digest Algorithm Agility discussion Viktor Dukhovni
- Re: [dane] Digest Algorithm Agility discussion Paul Hoffman
- Re: [dane] Digest Algorithm Agility discussion Viktor Dukhovni
- Re: [dane] Digest Algorithm Agility discussion Paul Wouters
- Re: [dane] Digest Algorithm Agility discussion Viktor Dukhovni
- Re: [dane] Digest Algorithm Agility discussion Paul Hoffman
- Re: [dane] Digest Algorithm Agility discussion Viktor Dukhovni
- Re: [dane] Digest Algorithm Agility discussion Martin Rex
- Re: [dane] Digest Algorithm Agility discussion Viktor Dukhovni
- Re: [dane] Digest Algorithm Agility discussion Mark Andrews
- Re: [dane] Digest Algorithm Agility discussion Viktor Dukhovni
- Re: [dane] Digest Algorithm Agility discussion (c… Viktor Dukhovni
- Re: [dane] Digest Algorithm Agility discussion Jim Schaad
- Re: [dane] Digest Algorithm Agility discussion (c… Paul Hoffman
- Re: [dane] Digest Algorithm Agility discussion (c… Andrew Sullivan
- Re: [dane] Digest Algorithm Agility discussion (c… Viktor Dukhovni
- Re: [dane] Digest Algorithm Agility discussion (c… Scott Rose
- Re: [dane] Digest Algorithm Agility discussion (c… Viktor Dukhovni
- Re: [dane] Digest Algorithm Agility discussion (c… Scott Rose
- Re: [dane] Digest Algorithm Agility discussion Wes Hardaker
- Re: [dane] Digest Algorithm Agility discussion Viktor Dukhovni
- Re: [dane] Digest Algorithm Agility discussion Peter Palfrader
- Re: [dane] Digest Algorithm Agility discussion Mark Andrews
- Re: [dane] Digest Algorithm Agility discussion Viktor Dukhovni
- Re: [dane] Digest Algorithm Agility discussion Mark Andrews
- Re: [dane] Digest Algorithm Agility discussion Peter Palfrader
- Re: [dane] Digest Algorithm Agility discussion Mark Andrews
- Re: [dane] Digest Algorithm Agility discussion Viktor Dukhovni
- Re: [dane] Digest Algorithm Agility discussion Peter Palfrader
- Re: [dane] Digest Algorithm Agility discussion Viktor Dukhovni
- Re: [dane] Digest Algorithm Agility discussion Mark Andrews
- Re: [dane] Digest Algorithm Agility discussion Mark Andrews
- Re: [dane] Digest Algorithm Agility discussion Viktor Dukhovni
- Re: [dane] Digest Algorithm Agility discussion Paul Wouters
- Re: [dane] Digest Algorithm Agility discussion Viktor Dukhovni
- Re: [dane] Digest Algorithm Agility discussion Peter Palfrader
- Re: [dane] Digest Algorithm Agility discussion Wes Hardaker
- Re: [dane] Digest Algorithm Agility discussion Wes Hardaker