[Opendnssec-user] OpenDNSSEC 2.x roadmap - dynamic updates?

Matthijs Mekking matthijs at pletterpet.nl
Mon Oct 13 07:20:20 UTC 2014


On 07-10-14 20:09, Kevin Thompson wrote:
> On 2014-10-07 03:44, Klaus Darilion wrote:
>> On 06.10.2014 19:15, Kevin Thompson wrote:
>>> Howdy all,
>>> I was reading the release plan[1], and I saw mentioned 'Signer - Dynamic
>>> updates'. Could you elaborate on that?
>>> Currently, the best method I've found for integrating ODS with a dynamic
>>> zone on one server is the CentralNIC pattern[2] - the unsigned zone is
>>> served by a master from a private view, injected into ODS by a DNS input
>>> adapter, signed file goes out, and finally the signed file is served
>>> statically by the master on a public view. This method works, but is a
>>> little cumbersome.
>>> I'm really hoping that what is meant by 'dynamic updates' is that ODS
>>> would take notifies to know when the dynamic zone is changed, would
>>> download the updates via IXFR, and then directly add/update/delete
>>> records as needed via dynamic updates. If so, this would be huge, since
>>> it would greatly ease integration of ODS into dynamic zones. I imagine
>>> the similarly mentioned "Database input and output adapter" would work
>>> the same way, but would directly update a database storing the zone.

I always thought of `Dynamic Updates` on OpenDNSSEC's roadmap to be an 
inbound adapter. In other words, unsigned UPDATE messages are accepted 
and applied to the zone in memory.

I don't know the time frame for this, or if this still is actually on 
the road map.

>> I wouldn't call that "dynamic updates". This is a normal zone transfer,
>> using incremental zone transfer.
>> With dynamic updates, there is no NOTIFY with XFR, but the UPDATE is
>> pushed directly to the name server.
> Thanks for replying.
> I'm not sure I understand how ODS gets involved in this situation since
> there are two communication directions to consider. When the dynamic
> zone is updated by, say, some zone manager UI, how is ODS notified so
> that it could push signature updates to the dynamic zone? I'm guessing
> here, but would that be:
>   1 Zone manager sends RFC 2136 UPDATEs to dynamic zone master
>   2 Dynamic zone master sends RFC 1996 NOTIFYs to ODS and slaves
>   3 ODS receives NOTIFY, performs an IXFR to find out what changed.

So far this makes sense.

>   4 ODS sends UPDATEs to dynamic zone master to update signatures.

Why would ODS need to send UPDATEs back to the master to update 
signatures? The zone in the master can be managed unsigned.

>   5 Dynamic zone master sends a RFC 1996 NOTIFY to ODS and slaves
>   6 ODS ignores the NOTIFY since it only contains changes it created.

These steps make the process very complicated IMO. Why not the following 

    1 Zone manager sends RFC 2136 UPDATEs to dynamic zone master
    2 Dynamic zone master sends RFC 1996 NOTIFYs to ODS and slaves
    3 ODS receives NOTIFY, performs an IXFR to find out what changed.
    4 ODS sends RFC 1996 NOTIFY to slaves.

That way, the slaves will retrieve the latest signed version of the 
zone, syncing with ODS, and the zone on the master can be maintainer 

I guess I don't understand why the zone on the master needs to know 
about DNSSEC.

> In the case where the change originates in ODS, for example when ODS
> decides to update expiring signatures, then I'd imagine that the
> sequence would be the same but starting at step 4.
> Do I have that right, or have I completely misunderstood what this
> proposed feature is about? Really, what I'm hoping for is to undo the
> CentralNIC "split-view" pattern and have ODS directly attach to a
> dynamic zone and manage it seamlessly as if it were any other automatic
> zone manager.

I think the proposed feature does not match your understanding of it. 
Also, the word 'Dynamic' is being used for two different things: Dynamic 
UPDATE and Dynamic zones. The proposed feature is to support the Dynamic 
UPDATE RFC 2136 format. OpenDNSSEC can already deal with Dynamic zones.

Best regards,

> --Kevin
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