Re: [dane] dual use of TLSA RR
Viktor Dukhovni <ietf-dane@dukhovni.org> Thu, 09 October 2014 16:27 UTC
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Date: Thu, 09 Oct 2014 16:27:52 +0000
From: Viktor Dukhovni <ietf-dane@dukhovni.org>
To: dane@ietf.org
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Subject: Re: [dane] dual use of TLSA RR
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On Fri, Oct 10, 2014 at 02:36:42AM +1100, shmick@riseup.net wrote: > is it possible & legal to incorporate 2 TLSA RRs in a zone file the > following way for the same protocol/port ie. 25: Yes, absolutely. Multiple TLSA RRs can and will appear in a TLSA RRset, either as a result of key rotation in progress, or because there are multiple keys valid at the same time. > Assume postfix has setup 2 certs; an RSA and ECDSA > > If it's possible how would a particular TLSA RR be chosen? Each TLSA RRs is compared against the server's chain until one matches. > Is it based upon negotiated cipher? No, generally the TLSA RR does not signal a particular public key algorithm. With matching type Full(0) one could infer the algorithm from public key, but in practice it is easier to just compare the bits regardless. -- Viktor.
- [dane] dual use of TLSA RR shmick@riseup.net
- Re: [dane] dual use of TLSA RR Viktor Dukhovni
- Re: [dane] dual use of TLSA RR shmick@riseup.net
- Re: [dane] dual use of TLSA RR Viktor Dukhovni