Fully automated DNSSEC with BIND 9.16

Tue Apr 11 13:15:23 UTC 2023

Thank you so much!
Regards

David 

-----Original Message-----
From: bind-users <bind-users-bounces at lists.isc.org> On Behalf Of Matthijs Mekking
Sent: 11 April 2023 13:03
To: bind-users at lists.isc.org
Subject: Re: Fully automated DNSSEC with BIND 9.16

On 4/11/23 13:14, David Carvalho wrote:
> Hello and thank you so much for your help. Regarding question 1, My 
> version is 9.16-9.1623-0.9.el8...so I got the bug. No update available 
> from Oracle Linux yet, so I'll create a folder and maintain a copy of 
> those files there.
> 
> In which situation should I be required to resend my key to the top 
> domain? I'll have to read more about ZSK, KSK and CSK rollovers. All 
> of this is new to me so far.

I think it would be useful to read this knowledge base article if all is new to you:

     https://kb.isc.org/v1/docs/en/dnssec-key-and-signing-policy

Basically in the following two scenarios you need to publish the public key to the parent domain:

1. Enabling DNSSEC
2. KSK rollover

With the default policy, KSK rollover is not scheduled, so only after you manually roll the key you need to publish (and withdraw) the DS records from the parent.

When exactly? You can check with 'rndc dnssec -status <zone>'. If the DS state is rumoured it is safe to submit the DS to the parent.

Best regards,

Matthijs

> 
> Thanks! David Carvalho
> 
> 
> 
> -----Original Message----- From: bind-users 
> <bind-users-bounces at lists.isc.org> On Behalf Of Matthijs Mekking
> Sent: 11 April 2023 11:16 To: bind-users at lists.isc.org Subject: Re:
> Fully automated DNSSEC with BIND 9.16
> 
> Hello David,
> 
> On 4/11/23 12:02, David Carvalho via bind-users wrote:
>> Hello, hope everyone is fine.
>> 
>> So it seems that going to Bind version 9.16 was the right call as it 
>> simplifies DNSSEC a lot.
>> 
>> Nevertheless, I would like to clarify some things because our 
>> organization has a parent domain and I host my own e-mail servers.
>> I know they had problems while implementing DNSSEC on the top domain, 
>> and some configurations had to be made to let subdomain e-mail 
>> servers to still work after DNSSEC.
>> 
>> Following RedHat tutorial, all I had to do was add “*dnssec-policy
>> default;”* into one of my zones for testing purposes. I’m not testing 
>> Reverse zones yet.
>> 
>> After this, 3 files “Kmy.domain***” were created:
>> 
>> “.key”
>> 
>> “.private”
>> 
>> “.state”.
>> 
>> Three  files regarding my zone were also created:
>> 
>> My.domain.signed
>> 
>> And the following 2, which I’m not sure what their purpose is
>> 
>> *My.domain*.*jbk* and*my.domain.signed.jnl*
> 
> The .jnl files are journal files and are created when a zone uses 
> dynamic update to store changes that are made to zone files.
> 
> The .jbk files are truly temporary files and should be removed again 
> when writing the contents of the zone to file.
> 
>> There are also “managed-keys.bind” and “managed-keys.bind.jnl”
> 
> These are trust anchor files, and store the state of those keys.
> These will be updated on a restart.
> 
>> 
>> My questions:
>> 
>> 1. Everytime I restart the service, it seems all these files are 
>> recreated.  Does this mean that every time I make a change in the 
>> host zone, I need resend the public key to my top domain?
> 
> No, the key files (.key, .private, .state) should also not be 
> recreated upon restart (a bug that would recreate key files every 
> keymgr run was fixed in 9.16.30).
> 
> 
>> 2. Do Parental Agents help with this?
> 
> Not in this case, because there is no need to send the public key to 
> the parent domain. Parental agents only help to automatically detect 
> if the corresponding DS has been published.
> 
> Without parental agents configured you need to use 'rndc dnssec 
> -checkds' to tell BIND that a certain DS has been published/withdrawn 
> in order to continue key rollover.
> 
> 
>> 3. Which format should I use when providing the key to the top level 
>> domain?
>> 
>> *         dnssec-dsfromkey
>> /var/named/K/example.com.+013+61141/.key*
>> 
>> or
>> 
>> *         grep DNSKEY /var/named/K*/*example.com.+013+61141.key*/
> 
> I assume you are submitting the public key to your registrar and it 
> depends on what format your registrar accepts.
> 
> 
> Best regards,
> 
> Matthijs
> 
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