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Re: [Samba] Workstations cannot update DNS




> > > > 
> > 
https://wiki.samba.org/index.php/BIND9_DLZ_AppArmor_and_SELinux_Integration

> > > >
> > > > selinux is not installed.
> > > > Firewall is not active.
> > > > iptables is not active.
> > > The problem appears to have something to do with Apparmor.
> > > >
> > > > 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
> > >
> > > OK, but I do not remember you saying which version of Samba you are
> > > using, later versions now use the path '/var/lib/samba/bind-dns' 
> > instead
> > > of '/var/lib/samba/private'
> >
> > I am using Bind9 on Ubuntu 18.04
> > Ok, I verified permissions on /var/lib/samba/bind-dns.
> >
> > >
> > > >
> > > > 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
> >
> > I changed above line to.
> >      /var/lib/samba/bind-dns/** rwk,
> > Or should it be?
> >       /var/lib/samba/bind-dns/dns/** rwk,
> >
> > > >   /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
> > > Is the above your reverse zone ?
> >
> > The only thing I added or modified in this entire directory is
> > named.conf.msi and added line,
> > include "/etc/bind/named.conf.msi";
> > to named.conf
> > The rest you see here was not added by me.
> >
> > > >
> > > > -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
> > >
> > > And is the above your forward zone ?
> > >
> > > If it is yes to both of the last questions, then you need to delete
> > > them, you cannot use flatfiles with BIND9_DLZ
> >
> > Do I delete only the 'db.*' files?  Are the 'named.conf*' files in 
this
> > location not used?  If I do delete the named.* files, what do I edit
> > to add a slave domain for mycompany.com (DC domain is 
msi.mycompany.com)?
> > The DC is master of msi.mycompany.com, another server is master of
> > mycompany.com.
> 
> 
> Your DC is authoritative for your ad domain and should only store 
> records for that domain, anything else should be forwarded to a dns 
> server outside the ad domain.
> 
> I would suggest you delete these:
> 
> db.172.23.93
> 
> named.conf.msi

This has been cleaned up.

> 
> I think it might be a good idea if you post the contents of these files:
> 
> /etc/bind/ named.conf
> /etc/bind/named.conf.options
> /etc/bind/named.conf.local
> /etc/bind/named.conf.default-zones

named.conf
// This is the primary configuration file for the BIND DNS server named.
//
// Please read /usr/share/doc/bind9/README.Debian.gz for information on 
the 
// structure of BIND configuration files in Debian, *BEFORE* you customize 

// this configuration file.
//
// If you are just adding zones, please do that in 
/etc/bind/named.conf.local

include "/etc/bind/named.conf.options";
include "/etc/bind/named.conf.local";
include "/etc/bind/named.conf.default-zones";


named.conf.default-zones
// prime the server with knowledge of the root servers
zone "." {
        type hint;
        file "/etc/bind/db.root";
};

// be authoritative for the localhost forward and reverse zones, and for
// broadcast zones as per RFC 1912

zone "localhost" {
        type master;
        file "/etc/bind/db.local";
};

zone "127.in-addr.arpa" {
        type master;
        file "/etc/bind/db.127";
};

zone "0.in-addr.arpa" {
        type master;
        file "/etc/bind/db.0";
};

zone "255.in-addr.arpa" {
        type master;
        file "/etc/bind/db.255";
};


named.conf.local
//
// Do any local configuration here
//

// Consider adding the 1918 zones here, if they are not used in your
// organization
//include "/etc/bind/zones.rfc1918";

// adding the Samba dlopen ( Bind DLZ ) module
include "/var/lib/samba/bind-dns/named.conf";


named.conf.options
options {
        directory "/var/cache/bind";

        // If there is a firewall between you and nameservers you want
        // to talk to, you may need to fix the firewall to allow multiple
        // ports to talk.  See http://www.kb.cert.org/vuls/id/800113

        // If your ISP provided one or more IP addresses for stable 
        // nameservers, you probably want to use them as forwarders. 
        // Uncomment the following block, and insert the addresses 
replacing 
        // the all-0's placeholder.
        // 172.23.93.3 is master dns for mycompany.com

        forwarders {
              172.23.93.3; 8.8.8.8;
        };

 
//========================================================================
        // If BIND logs error messages about the root key being expired,
        // you will need to update your keys.  See 
https://www.isc.org/bind-keys
 
//========================================================================
        dnssec-validation auto;

        auth-nxdomain no;    # conform to RFC1035
        //listen-on-v6 { any; };
        listen-on { any; };
        notify no;

        empty-zones-enable no;
        // DNS dynamic updates via Kerberos 
/var/lib/samba/private/dns.keytab;
        tkey-gssapi-keytab "/var/lib/samba/private/dns.keytab";
};

> 
> Rowland
> -- 
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