Howdy,
I have a domain which is being signed automatically using auto-dnssec on an
older bind9, it uses RSASHA1 keys. Now the registry requires us to move to a
more secure algorithm. Therefore I updated bind to bind9.16.6. Now I could
switch to dnssec-policy, however if I change the algorithm, it immediately
drops the old keys instead of retiring them. I didn't find any hint in the docs
or on the net how to do this.
So this was the old config:
zone "customer.bank" in {
type master;
file "zone/master/customer.bank";
key-directory "/usr/local/etc/namedb/zone/keys";
auto-dnssec maintain;
inline-signing yes;
dnssec-dnskey-kskonly yes;
};
Now after upgrading I changed it to:
dnssec-policy "eval" {
keys {
ksk lifetime 2d algorithm rsasha1;
zsk lifetime 2d algorithm rsasha1;
ksk lifetime 365d algorithm ecdsap256sha256;
zsk lifetime 60d algorithm ecdsap256sha256;
};
};
zone "helaba.bank" in {
type master;
file "zone/master/helaba.bank";
key-directory "/usr/local/etc/namedb/zone/keys";
dnssec-policy "eval";
};
My idea was to retire the rsasha1 keys after 2 days and then replace them with
the newly generated ones. However, this is what bind actually did:
15-Jan-2021 11:20:46.036 zoneload: zone customer.bank/IN (unsigned): loaded
serial 2020100500
15-Jan-2021 11:20:46.042 zoneload: zone customer.bank/IN (signed): loaded
serial 2020100551 (DNSSEC signed)
15-Jan-2021 11:20:46.049 general: zone customer.bank/IN (signed):
receive_secure_serial: unchanged
15-Jan-2021 11:20:46.297 notify: zone customer.bank/IN (signed): sending
notifies (serial 2020100551)
15-Jan-2021 11:20:46.297 dnssec: zone customer.bank/IN (signed): reconfiguring
zone keys
15-Jan-2021 11:20:46.311 dnssec: keymgr: retire DNSKEY
customer.bank/RSASHA256/31284 (ZSK)
15-Jan-2021 11:20:46.311 dnssec: keymgr: retire DNSKEY
customer.bank/RSASHA256/39364 (KSK)
15-Jan-2021 11:20:46.664 dnssec: keymgr: DNSKEY customer.bank/RSASHA1/14477
(KSK) created for policy eval
15-Jan-2021 11:20:46.868 dnssec: keymgr: DNSKEY customer.bank/RSASHA1/61258
(ZSK) created for policy eval
15-Jan-2021 11:20:46.868 dnssec: keymgr: DNSKEY
customer.bank/ECDSAP256SHA256/41200 (KSK) created for policy eval
15-Jan-2021 11:20:46.868 dnssec: keymgr: DNSKEY
customer.bank/ECDSAP256SHA256/55282 (ZSK) created for policy eval
15-Jan-2021 11:20:46.938 dnssec: DNSKEY customer.bank/RSASHA256/31284 (ZSK) is
now deleted
15-Jan-2021 11:20:46.938 dnssec: DNSKEY customer.bank/RSASHA256/39364 (KSK) is
now deleted
15-Jan-2021 11:20:46.939 dnssec: Fetching customer.bank/RSASHA1/14477 (KSK)
from key repository.
15-Jan-2021 11:20:46.939 dnssec: DNSKEY customer.bank/RSASHA1/14477 (KSK) is
now published
15-Jan-2021 11:20:46.939 dnssec: DNSKEY customer.bank/RSASHA1/14477 (KSK) is
now active
15-Jan-2021 11:20:46.939 dnssec: Fetching customer.bank/RSASHA1/61258 (ZSK)
from key repository.
15-Jan-2021 11:20:46.939 dnssec: DNSKEY customer.bank/RSASHA1/61258 (ZSK) is
now published
15-Jan-2021 11:20:46.939 dnssec: DNSKEY customer.bank/RSASHA1/61258 (ZSK) is
now active
15-Jan-2021 11:20:46.939 dnssec: Fetching customer.bank/ECDSAP256SHA256/41200
(KSK) from key repository.
15-Jan-2021 11:20:46.939 dnssec: DNSKEY customer.bank/ECDSAP256SHA256/41200
(KSK) is now published
15-Jan-2021 11:20:46.939 dnssec: DNSKEY customer.bank/ECDSAP256SHA256/41200
(KSK) is now active
15-Jan-2021 11:20:46.939 dnssec: Fetching customer.bank/ECDSAP256SHA256/55282
(ZSK) from key repository.
15-Jan-2021 11:20:46.939 dnssec: DNSKEY customer.bank/ECDSAP256SHA256/55282
(ZSK) is now published
15-Jan-2021 11:20:46.939 dnssec: DNSKEY customer.bank/ECDSAP256SHA256/55282
(ZSK) is now active
15-Jan-2021 11:20:46.985 dnssec: zone customer.bank/IN (signed): next key
event: 15-Jan-2021 13:20:46.297
15-Jan-2021 11:20:51.305 notify: zone customer.bank/IN (signed): sending
notifies (serial 2020100558)
In fact it created 2 new key pairs, one for rsasha1 and one for ecdsap256sha256.
I am pretty sure my setup is invalid somehow.
So how could I configure bind so that it keeps the existing rsasha1 keys for a
while and use the new ones only afterwards?
Best regards,
Tom
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