Automatic RRSIG Refresh in BIND 9.8.2

[Latitude]

Due to customer requirements, I'm deploying BIND 9.8.2 on RHEL 6.8 and can
neither upgrade BIND to a newer version or upgrade to RHEL 7. I have
successfully configured a master and slave DNS server, DNSSEC, with
Transaction Signatures, and have performed a successful manual zone update,
incremented the serial number, resigned the zone, and completed a zone
transfer of a DNSSEC-signed zone file for which the master server is
authoritative.

I have read in Michael W. Lucas' DNSSEC Mastery book that BIND 9.9 and newer
can automatically sign zones and refresh signatures (RRSIGs), but older
versions cannot (p. 53). Unfortunately, I have to use BIND 9.8.2. Manually
efreshing RRSIGs for all zones his is quite a task to refresh signatures if
the client requires RRSIGs to be renewed once per 7 days. Is it possible to
automatically refresh RRSIGs in BIND 9.8.2 by any means automatically?



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[Tony Finch]

Latitude <arlendel...@gmail.com> wrote:
>
> I have read in Michael W. Lucas' DNSSEC Mastery book that BIND 9.9 and newer
> can automatically sign zones and refresh signatures (RRSIGs), but older
> versions cannot (p. 53).

That isn't entirely correct: BIND has had automatic signing since 9.7
(if I remember correctly - it has been a long time). You just need to
set `auto-dnssec maintain;` and (for simple cases) `update-policy local;`.
See section 4.9.3 on page 26 of
https://ftp.isc.org/isc/bind9/9.8.2/doc/arm/Bv9ARM.pdf

Also see my blog about DNSSEC in BIND 9.8 from 6 years ago (thanks Red Hat
for keeping such ancient relics relevant for so long)
http://fanf.livejournal.com/112476.html

What was new in 9.9 was inline-signing mode. Shameless plug: you can get
something very like inline-signing mode for antediluvian versions of BIND
using my `nsdiff` program http://dotat.at/prog/nsdiff/

Tony.
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[Latitude]

Thanks for your reply Tony. Great references. I've got the ARM for 9.8.2
handy but thank you for sending the link to your article and pointing me out
to Section 4.9.3 Fully Automatic Signing. It's been helpful to confirm zone
RRSIGs can refresh automatically.

A zone that was signed with a sigvalidity period to be refreshed every 7
days is not being refreshed and I'm trying to troubleshoot. I've given the
zone statement the *auto-dnssec maintain;* and *update-policy local;*
statements as described, and I'm getting the error below repeatedly in my
/var/log/message feed:

*info: zone <zone name>/IN: reconfiguring zone keys
<zone name>.jnl: create: permission denied
named[5952]: 14-Jun-2017 20:38:08.640 general: error: zone <zone name>/IN:
zone_rekey:dns_journal_open -> unexpected error*

The user *named* has the rwx permissions on the directory containing the
source zone file and the DNSSEC-signed zone file <zone-name>.signed. This
installation is BIND chrooted so the absolute path is
*/var/named/chroot/var/named/*. Is BIND trying to create the .jnl file in
this directory (*/var/named/chroot/var/named/*) and failing to due so? If
so, I don't see why it's having an issue because user:group ownership of the
/var/named/chroot/var/named directory is named:named and permissions are set
to 750 on it. I believe this could be the clue to why my zone RRSIG isn't
being refreshed. A lot of Google searching for this error hasn't yielded
anything to help my situation either. Thank you in advance for any input.

Below are my named.conf and zone statement file excerpts for reference:

named.conf file DNSSEC options:

// DNSSEC options
dnssec-enable yes;
dnssec-validation yes;
dnssec-lookaside auto;
sig-validity-interval 7 2; //RRSIG validity period, BIND 9 ARM,
Chapter 6
key-directory "/etc/keys/dnssec"; //Directory containing all DNSSEC
keys

//Zone statement
zone "<zone-name>" {
type master;
update-policy local;
file "db.<zone-name>.signed";
auto-dnssec maintain;
allow-query { any; };
allow-transfer { xfers; };
};




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[Mark Andrews]

https://kb.isc.org/article/AA-00320/0/Why-cant-named-update-slave-zone-database-files-slave-journal-files-and-master-zones-from-journals-.html

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[Petr Mensik]

Hi,

I think you should use file "dynamic/db.<zone-name>.signed"; instead. On Red Hat /var/named is by default read only to named. It is enforced both by unix permissions and SELinux policy. I think you are being blocked by selinux.

Try sudo ausearch -i -ts recent -m avc -m user_avc -m selinux_err
It may show you some errors that are named related.

For dynamic updates, directory /var/named/dynamic is prepared. Signature maintaining is processed like dynamic updates to the zone, so write access to the zone file and its .jnl is required. You can enable write there, check https://bugzilla.redhat.com/show_bug.cgi?id=545128

Regards,
Petr

--
Petr Menšík
Software Engineer
Red Hat, http://www.redhat.com/
email: peme...@redhat.com PGP: 65C6C973

[Latitude]

Thanks Petr, I'll relocate the zone data files into the /dynamic directory.

Should DNSSEC key signing keys and zone signing keys also be located in a
directory inside the /dynamic directory? Would it be acceptable to have them
in a directory such as /var/named/chroot/etc/keys/dnssec?

Thank you.





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[Tony Finch]

Latitude <arlendel...@gmail.com> wrote:
>
> Should DNSSEC key signing keys and zone signing keys also be located in a
> directory inside the /dynamic directory? Would it be acceptable to have them
> in a directory such as /var/named/chroot/etc/keys/dnssec?

On my master server I have zone files and journals in a .../zone/
directory writable by named, and DNSSEC keys in a different .../key/
directory read-only for named, but writable by a semi-privileged user
that is responsible for key maintenance.

Tony.
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