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L.P.H. van Belle

2019-Feb-20 10:17 UTC

[Samba] Samba + BIND9 DLZ. DNS dosen't resolve FQDN, only short hostname

Hai, 
> -----Oorspronkelijk bericht-----
> Van: samba [mailto:samba-bounces at lists.samba.org] Namens Mgr. 
> Peter Tuharsky via samba
> Verzonden: woensdag 20 februari 2019 10:28
> Aan: samba at lists.samba.org
> Onderwerp: Re: [Samba] Samba + BIND9 DLZ. DNS dosen't resolve 
> FQDN, only short hostname
> 
> Well, the mystery is solved. It WAS Avahi, in a way... This is said wrong. ... 
> Eventhough it was disabled as a daemon, 
> it still haunted the system by the means of nsswitch.conf
> 
> In the 'hosts' line, the Debian default entry 'mdns4_minimal
> [NOTFOUND=return]' does exactly what we don't want - for 
> .local domains
> it asks Avahi and if it dosen't know, it never asks the other 
> services,
> such as dns etc.
And wrong is `the domain is .local` 
Why o why is .local use. That is a reserved name for mDNS (avahi).. Yes. 
So what happend here is TOTALY CORRECT. Here the problem is you are using 
.local
> 
> I hope the documentation (Wiki) should be more vocal about that - that
> if the domain is .local, the 'dns' entry MUST precede
'mdns4_minimal'
> and 'mdns4' entries.
Possible yes, but if correctly setup, not needed. 
And a bit ahead thinking people... Future systems, will mostly use systemd, if
we like it or not.

Then if systemd is use correctly and you use the systemd-resolvd, you get this.
A random new server im setting up, not a samba server, but that not the point,
the point is resolving,
And what you see in this output. 

sudo resolvectl  ( the defaults ) 
Global
       LLMNR setting: yes
MulticastDNS setting: yes
  DNSOverTLS setting: no
      DNSSEC setting: no
    DNSSEC supported: no
Fallback DNS Servers: 8.8.8.8
                      8.8.4.4
                      2001:4860:4860::8888
                      2001:4860:4860::8844
          DNSSEC NTA: 10.in-addr.arpa
                      16.172.in-addr.arpa
                      168.192.in-addr.arpa
                      17.172.in-addr.arpa
                      18.172.in-addr.arpa
                      19.172.in-addr.arpa
                      20.172.in-addr.arpa
                      21.172.in-addr.arpa
                      22.172.in-addr.arpa
                      23.172.in-addr.arpa
                      24.172.in-addr.arpa
                      25.172.in-addr.arpa
                      26.172.in-addr.arpa
                      27.172.in-addr.arpa
                      28.172.in-addr.arpa
                      29.172.in-addr.arpa
                      30.172.in-addr.arpa
                      31.172.in-addr.arpa
                      corp
                      d.f.ip6.arpa
                      home
                      internal
                      intranet
                      lan
                      local
                      private
                      test

So what you shouldn't be using for samba domains:  
	                .corp
                      .home
                      .internal
                      .intranet
                      .lan
                      .local
                      .private
                      .test


More ahead,  about LLMNR
https://en.wikipedia.org/wiki/Link-Local_Multicast_Name_Resolution 
See also.. 
Network Basic Input/Output System (NetBIOS)
Peer Name Resolution Protocol (Pt DNS (mDNS)
Zero-configuration networking (Zeroconf)
Now mix this and what do you get. 
Samba + avahi and the use for LLMNR to replace netbios. 
But is this what you want.. 

I dont think so. 
Read : https://www.blackhillsinfosec.com/how-to-disable-llmnr-why-you-want-to/ 
https://www.crowe.com/cybersecurity-watch/netbios-llmnr-giving-away-credentials 
https://attack.mitre.org/techniques/T1171/ 

So why again is it so important to have a perfect dns setup..... 
So you dont have to use LLMNR or netbios anymore. 

But if you setup correct, avahi and dns can exist fine on a samba network. 
But again, this is my personal opinion, not recommended. 

Greetz, 

Louis

Rowland Penny

2019-Feb-20 10:33 UTC

head link

[Samba] Samba + BIND9 DLZ. DNS dosen't resolve FQDN, only short hostname

On Wed, 20 Feb 2019 11:17:05 +0100
"L.P.H. van Belle via samba" <samba at lists.samba.org> wrote:
> Hai, 
> 
> > -----Oorspronkelijk bericht-----
> > Van: samba [mailto:samba-bounces at lists.samba.org] Namens Mgr. 
> > Peter Tuharsky via samba
> > Verzonden: woensdag 20 februari 2019 10:28
> > Aan: samba at lists.samba.org
> > Onderwerp: Re: [Samba] Samba + BIND9 DLZ. DNS dosen't resolve 
> > FQDN, only short hostname
> > 
> > Well, the mystery is solved. It WAS Avahi, in a way... 
> This is said wrong. ... 
> 
> > Eventhough it was disabled as a daemon, 
> > it still haunted the system by the means of nsswitch.conf
> > 
> > In the 'hosts' line, the Debian default entry
'mdns4_minimal
> > [NOTFOUND=return]' does exactly what we don't want - for 
> > .local domains
> > it asks Avahi and if it dosen't know, it never asks the other 
> > services,
> > such as dns etc.
> 
> And wrong is `the domain is .local` 
> Why o why is .local use. That is a reserved name for mDNS (avahi)..
> Yes. So what happend here is TOTALY CORRECT. Here the problem is you
> are using  .local 
> 
> > 
> > I hope the documentation (Wiki) should be more vocal about that -
> > that if the domain is .local, the 'dns' entry MUST precede
> > 'mdns4_minimal' and 'mdns4' entries.
> 
> Possible yes, but if correctly setup, not needed. 
> And a bit ahead thinking people... Future systems, will mostly use
> systemd, if we like it or not. 
Seemingly not on a Tesla:

https://www.reddit.com/r/teslamotors/comments/92uu0x/model_3_has_a_hidden_web_browser/

Rowland

Mgr. Peter Tuharsky

2019-Feb-20 13:52 UTC

head link

[Samba] Samba + BIND9 DLZ. DNS dosen't resolve FQDN, only short hostname

Hm,

I thought this to be the very TLD that is specifically assigned for
local networks with no plans to become Internet-wide. What is the
recommended TLD for such networks then?


Dňa 20. 2. 2019 o 11:33 Rowland Penny via samba
napísal(a):> On Wed, 20 Feb 2019 11:17:05 +0100
> "L.P.H. van Belle via samba" <samba at lists.samba.org>
wrote:
>
>> Hai, 
>>
>>> -----Oorspronkelijk bericht-----
>>> Van: samba [mailto:samba-bounces at lists.samba.org] Namens Mgr. 
>>> Peter Tuharsky via samba
>>> Verzonden: woensdag 20 februari 2019 10:28
>>> Aan: samba at lists.samba.org
>>> Onderwerp: Re: [Samba] Samba + BIND9 DLZ. DNS dosen't resolve 
>>> FQDN, only short hostname
>>>
>>> Well, the mystery is solved. It WAS Avahi, in a way... 
>> This is said wrong. ... 
>>
>>> Eventhough it was disabled as a daemon, 
>>> it still haunted the system by the means of nsswitch.conf
>>>
>>> In the 'hosts' line, the Debian default entry
'mdns4_minimal
>>> [NOTFOUND=return]' does exactly what we don't want - for 
>>> .local domains
>>> it asks Avahi and if it dosen't know, it never asks the other 
>>> services,
>>> such as dns etc.
>> And wrong is `the domain is .local` 
>> Why o why is .local use. That is a reserved name for mDNS (avahi)..
>> Yes. So what happend here is TOTALY CORRECT. Here the problem is you
>> are using  .local 
>>
>>> I hope the documentation (Wiki) should be more vocal about that -
>>> that if the domain is .local, the 'dns' entry MUST precede
>>> 'mdns4_minimal' and 'mdns4' entries.
>> Possible yes, but if correctly setup, not needed. 
>> And a bit ahead thinking people... Future systems, will mostly use
>> systemd, if we like it or not. 
> Seemingly not on a Tesla:
>
>
https://www.reddit.com/r/teslamotors/comments/92uu0x/model_3_has_a_hidden_web_browser/
>
> Rowland
>
>

Mgr. Peter Tuharsky

2019-Feb-20 14:04 UTC

head link

[Samba] Samba + BIND9 DLZ. DNS dosen't resolve FQDN, only short hostname

Well, finally I found the recommendations against .local here:

https://wiki.samba.org/index.php/Active_Directory_Naming_FAQ


However, still, the originating wiki should AFAIK be more verbose.

https://wiki.samba.org/index.php/Setting_up_Samba_as_an_Active_Directory_Domain_Controller


For now it only says "Make sure that you provision the AD using a DNS
domain that will not need to be changed. Samba does not support renaming
the AD DNS zone and Kerberos realm. For additional information, see
Active Directory Naming FAQ."

I wish this would indicate somehow, that some TLD's are very problematic
and strongly discouraged. I took this notice like this: "I'm sure I
won't need to rename, so I don't need to read the Additional information
on AD Naming."


Dňa 20. 2. 2019 o 11:33 Rowland Penny via samba
napísal(a):> On Wed, 20 Feb 2019 11:17:05 +0100
> "L.P.H. van Belle via samba" <samba at lists.samba.org>
wrote:
>
>> Hai, 
>>
>>> -----Oorspronkelijk bericht-----
>>> Van: samba [mailto:samba-bounces at lists.samba.org] Namens Mgr. 
>>> Peter Tuharsky via samba
>>> Verzonden: woensdag 20 februari 2019 10:28
>>> Aan: samba at lists.samba.org
>>> Onderwerp: Re: [Samba] Samba + BIND9 DLZ. DNS dosen't resolve 
>>> FQDN, only short hostname
>>>
>>> Well, the mystery is solved. It WAS Avahi, in a way... 
>> This is said wrong. ... 
>>
>>> Eventhough it was disabled as a daemon, 
>>> it still haunted the system by the means of nsswitch.conf
>>>
>>> In the 'hosts' line, the Debian default entry
'mdns4_minimal
>>> [NOTFOUND=return]' does exactly what we don't want - for 
>>> .local domains
>>> it asks Avahi and if it dosen't know, it never asks the other 
>>> services,
>>> such as dns etc.
>> And wrong is `the domain is .local` 
>> Why o why is .local use. That is a reserved name for mDNS (avahi)..
>> Yes. So what happend here is TOTALY CORRECT. Here the problem is you
>> are using  .local 
>>
>>> I hope the documentation (Wiki) should be more vocal about that -
>>> that if the domain is .local, the 'dns' entry MUST precede
>>> 'mdns4_minimal' and 'mdns4' entries.
>> Possible yes, but if correctly setup, not needed. 
>> And a bit ahead thinking people... Future systems, will mostly use
>> systemd, if we like it or not. 
> Seemingly not on a Tesla:
>
>
https://www.reddit.com/r/teslamotors/comments/92uu0x/model_3_has_a_hidden_web_browser/
>
> Rowland
>
>

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