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Re: [Samba] Running off pre-created keytabs




On Fri, 11 Jan 2019 12:03:30 +0100
"Remy Zandwijk \(Samba\) via samba" <samba@xxxxxxxxxxxxxxx> wrote:

> 
> 
> > On 11 Jan 2019, at 10:33, Rowland Penny via samba
> > <samba@xxxxxxxxxxxxxxx> wrote:
> > 
> > On Fri, 11 Jan 2019 09:39:35 +0100
> > "Osipov, Michael via samba" <samba@xxxxxxxxxxxxxxx> wrote:
> > 
> >> Am 2019-01-10 um 17:02 schrieb Rowland Penny via samba:
> >>> On Thu, 10 Jan 2019 16:23:06 +0100
> >>> "Osipov, Michael via samba" <samba@xxxxxxxxxxxxxxx> wrote:
> >>> 
> >>>> Hi folks,
> >>>> 
> >>>> we'd like to provision new Samba servers (file sharing only) with
> >>>> the system keytab. It will precreated by some other process
> >>>> (msktutil) because we don't have direct access to a domain admin
> >>>> account. Is there any degragation in functionality by not using
> >>>> "secrets and keytab" and not doing "net ads join"?
> >>>> 
> >>>> This is somewhat similiar to my question from 2017-11 [1] where I
> >>>> wanted to do "net ads join" with precreated accounts, but haven't
> >>>> really found a usable solution.
> >>>> 
> >>>> Michael
> >>>> 
> >>>> 
> >>>> [1]
> >>>> https://lists.samba.org/archive/samba/2017-November/211945.html
> >>>> 
> >>> 
> >>> There is an interesting fact, if you add:
> >>> 
> >>>    dedicated keytab file = /etc/krb5.keytab
> >>>    kerberos method = secrets and keytab
> >>> 
> >>> to smb.conf and then join the domain with:
> >>> 
> >>> net ads join -U Administrator (or another user capable of joining
> >>> machines)
> >>> 
> >>> You will get the computers account created in AD and the keytab
> >>> created, so why do you feel the need to precreate the machines in
> >>> AD and use an extra package to join the domain ?
> >> 
> >> As depicted, this still requires an admin to be present at the
> >> box. I have to constantly beg people with that kind of permission
> >> to do a session with us to kinit and then join servers or create
> >> SPNs which do not match the FQDN. If the account can be precreated
> >> one can do this asynchronously and I'd remove the dependency on
> >> relying on specific people.
> >> 
> >> While it sounds for you trivial to have an admin account, in our
> >> huge new forest (Siemens and MS claim it to be the largest one on
> >> the planet) it is very strict about permissions after severe
> >> incident in the last forest. It took us weeks to find someone who
> >> is willing to join our servers once in a while. I guess this can
> >> be/is the case in many large companies. Morover, I will request a
> >> server which shall precreate machine accounts. This will make us
> >> independent from humans, but Samba won't play well with that. At
> >> last, if the colleague is on sick leave or else and we have to
> >> reset the account for whatsoever reason, we are bust!
> >> 
> >> Regards,
> >> 
> >> Michael
> >> 
> > 
> > I am with Louis here, this definitely says more about your company
> > than you or Samba. To put it bluntly, it appears that they do not
> > trust you, otherwise they would have given you delegated powers to
> > join computers.
> 
> Another use case is joining a machine to a domain of which only the
> read-only domain controllers are reachable (in a DMZ, for example).
> 
> In the university I work at, Windows servers in the DMZ are joined to
> the domain by pre-creating the machine account and running a script
> (as local admin) on the server. If Windows can do that, why not Samba?
> 

It probably can, 'samba-tool computer create <computername>' will
precreate the computer in AD, so all that should be needed is the
script, anybody got an example script ?

Rowland
 

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