[Samba] Samba4/Windows DNS replication and administration issue

[Peter Storkey]

Hi all,

I am having trouble with DNS replication between a Linux/Samba 4.0.9 box and Windows Server 2012 domain controller, as well as administering the Linux DNS from the Windows DNS Manager snap-in.

First a little background. I am trying to integrate a Samba 4.0.9 server as a domain controller in an existing Windows Active Directory domain. The domain and forest are at Windows 2008R2 functional level with a single domain controller which was upgraded from Windows Server 2008 R2 to Windows Server 2012.

I am running CentOS 6.4 x64, patched to current levels. I downloaded  and installed the Sernet binaries for Samba 4.0.9 but ran into problems joining the domain. It failed with the following error:

ERROR: no subClassOf 'top' for 'samDomain'
I found a bug report for this error at https://bugzilla.samba.org/show_bug.cgi?id=8680 and rebuilt the Sernet RPMs with the patches implemented. This time I was able to successfully join the domain. Replication seems to be working but I do get a warning from samba-tool drs showrepl:

==== KCC CONNECTION OBJECTS ====

Connection --
	Connection name: 3c20a62a-ad94-40ef-b346-ba8b15f829f8
	Enabled        : TRUE
	Server DNS name : server.example.com
	Server DN name  : CN=NTDS Settings,CN=server,CN=Servers,CN=Default-First-Site-Name,CN=Sites,CN=Configuration,DC=example,DC=com
		TransportType: RPC
		options: 0x00000001
Warning: No NC replicated for Connection!

The inbound and outbound neighbors all appear to be ok.

I started out with internal DNS but when I was unable to get it working correctly, I switched to bind (Centos package bind-9.8.2-0.17.rc1.el6_4.6.x86_64). 

The problem is that when I try to administer DNS through the Windows DNS Manager snap-in, my forward domain fails to load, with an error indicating zone data may be corrupt (it opens fine on the Windows DNS server). Additionally, my reverse zone does not appear to have replicated to the Linux server. 

When I click on the forward zone in DNS Manager, I see the following in /var/log/messages:

smbd[24043]: [2013/09/01 15:30:21.091035,  0] ../source3/rpc_server/svcctl/srv_svcctl_nt.c:326(_svcctl_OpenServiceW)
smbd[24043]:   _svcctl_OpenServiceW: Failed to get a valid security descriptorfree_pipe_context: destroying talloc pool of size 275
samba[19596]: [2013/09/01 15:30:25.505483,  0] ../source4/rpc_server/dnsserver/dcerpc_dnsserver.c:1068(dnsserver_query_zone)
samba[19596]:   dnsserver: Invalid zone operation IsSigneddnsserver: Invalid zone operation IsSigneddnsserver: Invalid zone operation IsSigneddnsserver: Found Unhandled DNS record type=49dnsserver: Found Unhandled DNS record type=49dnsserver: Found Unhandled DNS record type=49dnsserver: Found Unhandled DNS record type=49ndr_push_error(2): Bad switch value 49 at default/librpc/gen_ndr/ndr_dnsserver.c:544
samba[19596]: [2013/09/01 15:30:26.272723,  0] ../source4/rpc_server/dnsserver/dnsdata.c:354(dnsp_to_dns_copy)
samba[19596]:   dnsserver: Found Unhandled DNS record type=49dnsserver: Found Unhandled DNS record type=49dnsserver: Found Unhandled DNS record type=49dnsserver: Found Unhandled DNS record type=49ndr_push_error(2): Bad switch value 49 at default/librpc/gen_ndr/ndr_dnsserver.c:544

Querying DNS via nslookup/dig/host works fine but querying through samba-tool gives an error:

# samba-tool dns query server.domain.com domain.com @ ALL
GENSEC backend 'gssapi_spnego' registered
GENSEC backend 'gssapi_krb5' registered
GENSEC backend 'gssapi_krb5_sasl' registered
GENSEC backend 'sasl-DIGEST-MD5' registered
GENSEC backend 'schannel' registered
GENSEC backend 'spnego' registered
GENSEC backend 'ntlmssp' registered
GENSEC backend 'krb5' registered
GENSEC backend 'fake_gssapi_krb5' registered
Using binding ncacn_ip_tcp:server.example.com[,sign]
ERROR(runtime): uncaught exception - (-1073545204, 'NT_STATUS_RPC_BAD_STUB_DATA')
  File "/usr/lib64/python2.6/site-packages/samba/netcmd/__init__.py", line 175, in _run
    return self.run(*args, **kwargs)
  File "/usr/lib64/python2.6/site-packages/samba/netcmd/dns.py", line 974, in run
    None, record_type, select_flags, None, None)

and I see the following in /var/log/messages:

samba[19596]: [2013/09/01 15:31:55.207112,  0] ../source4/rpc_server/dnsserver/dnsdata.c:354(dnsp_to_dns_copy)
samba[19596]:   dnsserver: Found Unhandled DNS record type=49dnsserver: Found Unhandled DNS record type=49dnsserver: Found Unhandled DNS record type=49dnsserver: Found Unhandled DNS record type=49ndr_push_error(2): Bad switch value 49 at default/librpc/gen_ndr/ndr_dnsserver.c:544

Any help would be much appreciated.

Thanks,

Pete