[Samba] clients not connecting to samba shares

Gary Dale gary at extremeground.com
Sat Apr 1 16:51:07 UTC 2023

On 2023-04-01 11:48, Rowland Penny via samba wrote:
> On 01/04/2023 16:15, Gary Dale via samba wrote:
>>> The problem is, you shouldn't really have Linux groups per se, you 
>>> should have Windows groups that are also Linux groups i.e. 
>>> everything is in AD.
>> That's not a great idea. It would mean I'd have to modify every Linux 
>> system. 
> Possibly
>> And can Linux groups even have a domain let alone spaces in their 
>> names (e.g. home\Domain Users")?
> Yes:
> rowland at devstation:~$ getent group Domain\ Users
> domain 
> users:x:10513:krbtgt,dhcpduser,test,user1,backupuser,user2,fred,rowland,administrator
>  Mapping seems like a far more
>> practical solution.
> No it isn't and it sort of misses one of the points of AD, a single 
> point of authority.

The single point of authority requires modifying every Linux 
installation I've got to point to that authority. And what happens when 
the Authority isn't accessible (e.g. a laptop while on vacation)? It 
needs to fallback to a local password authority.

>>>> Any advice on how to proceed?
>>> Can we start with the smb.conf you are using now.
>> Here's the part without the share definitions:
>> # Global parameters
>> [global]
>>          dns forwarder =
>>          netbios name = THELIBRARIAN
>>          realm = HOME.RAHIM-DALE.ORG
>>          server role = active directory domain controller
>>          workgroup = HOME
>>          idmap_ldb:use rfc2307 = yes
> See below about the following lines:
>>          idmap config * : backend = tdb
>>          idmap config * : range = 3000-7999
>>          idmap config HOME:backend = ad
>>          idmap config HOME:schema_mode = rfc2307
>>          idmap config HOME:range = 10000-999999
>>          idmap config HOME:unix_nss_info = yes
>>          idmap config HOME:unix_primary_group = yes
> I will say this yet again, do not add 'idmap config' to a Samba AD 
> DC's smb.conf , they will do absolutely nothing.

Again, these lines are from the Samba wiki. They weren't my idea. If 
something is now obsolete, the wiki pages should be updated by someone 
who knows how Samba currently operates. I note that the wiki 
distinguishes between pre and post 4.6. If further changes to Samba were 
made, the wiki doesn't reflect it.

>>          vfs objects = acl_xattr
> Now that is a really, really big mistake. Whilst 'acl_xattr' is one of 
> the vfs objects used by a DC, you have just turned off the main one ' 
> dfs_samba4'

See previous comment.

>>          map acl inherit = yes
>>          store dos attributes = yes
>> [sysvol]
>>          path = /var/lib/samba/sysvol
>>          read only = No
>> [netlogon]
>>          path = /var/lib/samba/sysvol/home.rahim-dale.org/scripts
>>          read only = No
>> [Profiles]
>>          path = /home/samba/profiles
>>          read only = No
>>          create mask = 0777
>>          directory mask = 0777
>>          guest ok = Yes
>>          browseable = No
>> [homes]
>>          comment = Home Directories
>>          valid users = %S
>>          create mask = 0700
>>          directory mask = 0700
>>          browseable = No
>>> What version of NFS are you using 3 or 4 ?
>> nfsstat -s shows v4 but I'm using the v3 style settings in 
>> /etc/exports (e.g. /home/shares,sync) ). I 
>> haven't set up anything that takes advantage of any v4 features. I 
>> note that there are options for using Kerberos in v4, which I'm 
>> guessing is where you are going...
> Yep, you really should be using NFSv4, I wish Louis was still around, 
> he knew more about NFS than I do.
> What I will say is this, you know all that knowledge you know about 
> Samba PDC's and the like, well, you should forget most of it, AD is 
> nothing like an NT4-style domain. Once you get your head around this 
> and start to use AD as it is meant to be used, you will realise just 
> how much easier it is to use. Just one point of maintenance, user, 
> group and computer wise.
> Rowland
That may be true for full-time domain admins. However it seems less apt 
for people using Linux at home who need to run a windows (virtual) 
machine occasionally. Linux isn't built around AD and even using 
Kerberos is rarely something home users do.

And from what I've been seeing, you actually need to run a Windows 
client to administer AD - Linux programs no longer seem to be capable of 
doing everything that is needed. That makes advising using AD 
problematic - something to be avoided if possible.

As for forgetting NT4-style domains, I'm following documentation that 
deals strictly with Samba 4. I'd been running AD servers in various 
locations for a long time (an office with only Windows clients, my home 
with a mix of Linux and Windows clients). It's only in the last year 
that (some) things have stopped working. That's not due to a switch from 
NT4 to AD. It's due to AD breaking things.

My Linux server has been a great single-point of maintenance without my 
needing to jump through hoops. Conversely, getting any Linux workstation 
to authenticate to an AD instance has never worked. I tried that a few 
times over the last decade with zero success. In fact my workstation's 
/etc/nssswitch.conf still has the settings to use winbind for 
authentication. Fortunately it allows a fallback...

Can you point me to an up-to-date and accurate howto on setting up a 
Linux client to use AD and NFS4?

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