AppArmor, DHCP, Bind9 issue

[Scott Nicholas]

I think that's a good solution.

I edited the config as you did but ended up moving zones into
/etc/bind/zones. I guess because Debian already had some littered in
/etc/bind but I did not want to give write access to that directory.

I think that is your current issue. Classic permissions. "bind" group
missing write access to /etc/bind

Regards,
Scott

On Tue, Sep 22, 2020, 5:55 PM Mark Andrews <marka at isc.org> wrote:

> Put the zone file in /var/lib/bind and update named.conf.
>
> --
> Mark Andrews
>
> On 23 Sep 2020, at 00:43, Olivier <oza.4h07 at gmail.com> wrote:
>
> 
> Hello,
>
> I've got one ISC-DHCP server instance (4.4.1) and one Bind9 (9.11.5)
> instance installed on a Debian Buster box.
> Both come from Debian stable repo.
>
> I would like my DHCP server to update Bind9 database when leases are
> allocated to DHCP clients.
>
> I followed instructions from [1].
> I then met the following error:
> Sep 21 16:17:54 foo kernel: [ 8867.630002] audit: type=1400
> audit(1600697874.163:25): apparmor="DENIED" operation="mknod"
> profile="/usr/sbin/named" name="/etc/bind/db.bar.com.jnl" pid=1482
> comm="isc-worker0000" requested_mask="c" denied_mask="c" fsuid=107 ouid=107
> Sep 21 16:17:54 foo named[1482]: /etc/bind/db.bar.com.jnl: create:
> permission denied
>
> I edited /etc/apparmor.d/usr.sbin.named and it now includes the following
> content:
>  ...
>   # /etc/bind should be read-only for bind
>   # /var/lib/bind is for dynamically updated zone (and journal) files.
>   # /var/cache/bind is for slave/stub data, since we're not the origin of
> it.
>   # See /usr/share/doc/bind9/README.Debian.gz
>   # Next line added to work around apparmor issue
>   /etc/bind/*.jnl rw,
>   # End of addition
>   /etc/bind/** r,
>   /var/lib/bind/** rw,
>   /var/lib/bind/ rw,
>   /var/cache/bind/** lrw,
>   /var/cache/bind/ rw,
> ...
>
> Now, /var/log/syslog includes:
> Sep 22 08:43:25 foo named[449]: client @0x7efd7850f500 127.0.0.1#59205/key
> ddns_update: signer "ddns_update" approved
> Sep 22 08:43:25 foo named[449]: client @0x7efd7850f500 127.0.0.1#59205/key
> ddns_update: updating zone 'bar.com/IN': adding an RR at 'acerok.bar.com'
> A 192.168.42.104
> Sep 22 08:43:25 foo named[449]: client @0x7efd7850f500 127.0.0.1#59205/key
> ddns_update: updating zone 'bar.com/IN': adding an RR at 'acerok.bar.com'
> TXT "0097d51fa2194acbea0809316da0885aa0"
> Sep 22 08:43:25 foo named[449]: /etc/bind/db.bar.com.jnl: create:
> permission denied
>
> ls -l /etc
> drwxr-sr-x 2 root     bind      4096 sept. 21 16:01 bind
>
> ls -l /var/cache
> drwxrwxr-x  2 root bind 4096 sept. 22 16:25 bind
>
> ls -l /var/cache/bind
> lrwxrwxrwx 1 root root  23 sept. 21 14:29 db.192.168.42 ->
> /etc/bind/db.192.168.42
> lrwxrwxrwx 1 root root  29 sept. 21 14:28 db.bar.com -> /etc/bind/
> db.bar.com
> -rw-r--r-- 1 root root   0 sept. 21 16:36 db.bar.com.jnl
> ...
>
> How can I solve this ?
>
> [1] https://wiki.debian.org/DDNS
>
> Best regards
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