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DNSSEC Validation the Easy Way
Author: Reference Number: AA-01182 Views: 5487 Created: 2014-07-11 13:11 Last Updated: 2014-07-20 12:03 0 Rating/ Voters

Problem:

You want your recursive BIND server to perform DNSSEC validation, but you don't have much time to invest.


Solution:

ISC BIND 9 (in all currently supported versions at the time of this writing) contains a built-in copy of the root zone KSK (key signing key.)  To activate validation using this trust anchor requires only one non-default setting in your named.conf options statement:

options { ... dnssec-validation auto; ... };


With that added, "rndc reconfig" and you are done.


Note when using multiple views

The "dnssec-validation auto;" option may also be set per view, where a view is providing recursive service.  When sharing a cache among views with "attach-cache", the option must be the same for all affected views.

What will happen if/when the root KSK is rolled over / superseded by a new keypair?

At this writing (2014 July) we're still using the original root KSK as was used to sign the root zone initially in 2010.  BIND 9 will do the right thing in accordance with RFC 5011, if the root zone operators do.  BIND named stores the root key as received and validated from one or more root servers in its managed key database.  As long as your server is up and running and connected during the RFC 5011 rollover period, you should be fine.

Of course, if the root zone operators fail to adhere to RFC 5011 procedures in their KSK rollover, we do not know what to expect.

If your server misses out on the rollover period for some reason, including an initial install or activation of an outdated copy of BIND after the rollover completion, this will take just a bit longer.  See below about bindkeys-file.

Note that here, the word "outdated" might mean simply that the rollover took place before ISC was able to release new BIND versions.  If/when the root KSK changes, ISC will strive to release an update to all then-supported BIND versions, and this update will contain the new trust anchor.

How do I override the built-in trust anchor?

Simply download this file: http://ftp.isc.org/isc/bind9/keys/9.8/bind.keys.v9_8 .  Save it as your bindkeys-file (default path/filename is "/etc/bind.keys".)  If you have an incorrect or outdated managed-keys database in your named working directory (or as changed with the managed-keys-directory option), delete the files called managed-keys.bind and managed-keys.bind.jnl before starting named. (Yes, the 9.8 file version works for all later versions of BIND 9.)



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