[Samba] Workstations cannot update DNS

[durwin at mgtsciences.com]

> From: Rowland penny via samba <samba at lists.samba.org>
> To: samba at lists.samba.org
> Date: 05/14/2019 02:50 PM
> Subject: Re: [Samba] Workstations cannot update DNS
> Sent by: "samba" <samba-bounces at lists.samba.org>
> 
> On 14/05/2019 21:36, Durwin via samba wrote:
> > I am trying to get DDNS working, so workstations can update their ip.
> >
> > The domain is msi.mycompany.com
> >
> > The DC server works, as well as group policies.
> >
> > I set rights to these files
> >> chgrp bind /var/lib/samba/private/
> >> chmod 750 /var/lib/samba/private/
> >> chgrp bind /var/lib/samba/private/dns.keytab
> >> chmod 640 /var/lib/samba/private/dns.keytab
> > journalctl shows this.
> > May 14 14:22:32 audit[2117]: AVC apparmor="DENIED" 
operation="file_lock"
> > profile="/usr/sbin/named" name="/var/lib/samba/private/dns.keytab"
> > pid=2117 comm="isc-worker0000" requested_mask="k" denied_mask="k"
> > fsuid=111 ouid=0
> > May 14 14:22:32 kernel: audit: type=1400 audit(1557865352.085:35):
> > apparmor="DENIED" operation="file_lock" profile="/usr/sbin/named"
> > name="/var/lib/samba/private/dns.keytab" pid=2117 
comm="isc-worker0000"
> > requested_mask="k" denied_mask="k" fsuid=111 ouid=0
> 
> It looks like you need to fix Apparmor (at least), try reading this:
> 
> 
https://wiki.samba.org/index.php/BIND9_DLZ_AppArmor_and_SELinux_Integration


selinux is not installed.
Firewall is not active.
iptables is not active.

>From that page,
BIND process has read access to the following files
/var/lib/samba/private/dns.keytab
/var/lib/samba/private/named.conf               # THIS DOES NOT EXIST

as well read-write access to the 
/var/lib/samba/private/dns/             # THIS DOES NOT EXIST
directory and it's own zone file(s). 

this is in /etc/apparmor.d/usr.sbin.named.
  # /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
  /etc/bind/** r,
  /var/lib/bind/** rw,
  /var/lib/bind/ rw,
  /var/cache/bind/** lrw,
  /var/cache/bind/ rw,

  # gssapi
  /etc/krb5.keytab kr,
  /etc/bind/krb5.keytab kr,
  /var/lib/samba/lib/** rm,
  /var/lib/samba/private/dns.keytab r,
  /var/lib/samba/private/named.conf r,
  /var/lib/samba/private/dns/** rwk,            # THIS DOES NOT EXIST
  /var/lib/samba/etc/smb.conf r,

I rebooted just to be sure.  However, I still get client update denied.


This is in /etc/bind/

drwxr-sr-x  2 root bind 4096 May 15 10:38 ./
drwxr-xr-x 99 root root 4096 May  3 11:13 ../
-rw-r--r--  1 root root 2761 Apr 24 04:04 bind.keys
-rw-r--r--  1 root root  237 Oct 10  2018 db.0
-rw-r--r--  1 root root  271 Oct 10  2018 db.127
-rw-r--r--  1 root bind  615 May 10 11:28 db.172.23.93
-rw-r--r--  1 root root  237 Oct 10  2018 db.255
-rw-r--r--  1 root root  353 Oct 10  2018 db.empty
-rw-r--r--  1 root root  270 Oct 10  2018 db.local
-rw-r--r--  1 root root 3171 Oct 10  2018 db.root
-rw-r--r--  1 root bind  499 May 10 11:12 named.conf
-rw-r--r--  1 root bind  662 May 14 11:42 named.conf.default-zones
-rw-r--r--  1 root bind  258 Apr 29 11:34 named.conf.local
-rw-r--r--  1 root bind  193 May 14 11:44 named.conf.msi
-rw-r--r--  1 root bind 1109 May 14 09:22 named.conf.options
-rw-r-----  1 bind bind   77 Apr 29 11:22 rndc.key
-rw-r--r--  1 root root 1317 Oct 10  2018 zones.rfc1918


Thank you,

Durwin


> Rowland
> 
> 
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