On 2/12/19 7:26 PM, Paul R. Ganci wrote:
Last weekend I had my DNSSEC keys expire. I discovered that they had
expired the hard way... namely randomly websites could not be found and
email did not get delivered. It seems that the keys were only valid for
what I estimate was about 30 days. It is a real PITA to have update the
keys, restart named and then update Godaddy with new digests.
DNSSEC keys do not expire. Signatures do expire. How long a signature is
good for depends upon the software generating the signature, some lets
you specify. ldns I believe defaults to 60 days but I am not sure.
The keys are in DNSSKEY records that are signed by your Key Signing Key
and must be resigning before the signature expires or they will no
longer validate.
Likewise, the other records in the zone must be resigned by your Zone
Signing Key before their signatures expire.
The first part of the problem is fairly manageable in the sense I
already have a script that partially can do the job of updating the DNS
server. However from what I can tell the only way I can update the
DNSSEC of my 8 domains is via the Godaddy control panel GUI. So a couple
of questions.
1.) Is anyone aware of anyway to update Godaddy DNSSEC data via a Centos
7 bash shell? I will contact Godaddy but I suspect I am SOL but thought
I would ask here thinking somebody else may have already run into this
issue.
That I don't know, I use ldns to sign my zone files and upload them to
my own authoritative nameserver.
2.) Assuming the answer to DNSSEC is no, can I at least have the keys
last longer than they do by default. I am presently creating the keys via:
> dnssec-keygen -a NSEC3RSASHA1 -b 2048 -n ZONE zone
> dnssec-keygen -f KSK -a NSEC3RSASHA1 -b 4096 -n ZONE zone
It's not the keys that are the issue, but the RRSIG record that contains
a start and expiration time for the records.
If you upload signed zone files to godaddy, make sure to resign once a
week or so so that the RRSIG gets updated.
man ldns-signzone
It has switches for setting the start and expiration date of signatures.
By default I believe it uses current timestamp for start and +60 days
for end, though it may be +30 days.
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