Mixing Algorithms for DNSSEC

Mark Andrews marka at isc.org
Sat Oct 15 23:29:59 UTC 2011


In message <1318673495.8491.89.camel at mjelap.posix.co.za>, Mark Elkins writes:
> 
> Saw the light of day and decided to change my DNSSEC signing script to
> create DNS Keys with RSASHA256 rather than RSASHA1. It seems one can not
> mix these two in the same zone????
> 
> I've created a short script to demonstrate the issue.
> 
> I've Attached "RunTest" that simulates what I am doing.
> It uses the zone "foo.com" - I've attached "db.foo.com.base" as a simple
> zone.
> I've attached the "output"
> Bast to do this in a completely empty directory!
> 
> Basically - create a KSK and ZSK with RSASHA1 - Sign - and visibly check
> the results.
> Add a new KSK using RSASHA256 - prep the zone and sign again.

Add both a KSK and a ZSK for RSASHA256.  dnssec-signzone checks for
*both* key types for *all* algorithms.  Alternatively you can turn
the sanity check off (-P) which checks for both key types for all
algorithms.

> 1 - Signer is confused???? - can not sign (or generate a new Signed
> Zone)...
>         Verifying the zone using the following algorithms: RSASHA1.
>         Missing self signing KSK for algorithm RSASHA256
>         The zone is not fully signed for the following algorithms:
>         RSASHA256.
>         dnssec-signzone: fatal: DNSSEC completeness test failed.
>        =20
> 2 - The file "dsset-foo.com." has too many DS records. Why is
> dnssec-signzone adding the DS records for a ZSK into dsset?
> 
> If everything is either RSASHA1 or RSASHA256 - everything is OK.
> 
> Bug? Simply how it should be by design? This really disturbs me - these
> Keys take ages in the real world to migrate using reasonable timings -
> do I have to Zap all my Keys - redo all zones. Is this always the case
> when an Algorithm changes?
> 
> Versions: BIND 9.7.3-P3, dnssec-keygen: 9.7.3, dnssec-signzone: 9.7.3-P3
> --=20
> Mark Elkins <mje at posix.co.za>
> Posix Systems
> 
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-- 
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: marka at isc.org



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