[Samba] Authenticating Samba Share with Domain Administrator
mfoley at ohprs.org
Wed Aug 28 03:34:45 UTC 2019
On Thu, 22 Aug 2019 08:04:10 +0100 Rowland penny <rpenny at samba.org> wrote:
> On 21/08/2019 22:47, Mark Foley via samba wrote:
> > I have a NAS (Linux/Slackware 14.2) that is a domain member. "Normal" AD Windows users can map
> > shared directories just fine without having to enter Credentials. If I try doing that with the
> > domain Administrator it prompts me for the credentials, then fails. On the NAS I can get an
> > "OK" status with ntlm_auth using the administrator credentials. I cannot 'su -' to the
> > administrator account on the NAS, nor can I do so on the AD/DC. On the latter I get
> > "Authentication Failure".
> > On the NAS, a getent for a normal user gives:
> > # getent passwd mark
> > mark:*:10001:10000:Mark Foley:/home/HPRS/mark:/bin/bash
> > I cannot getent for the administrator on the NAS (comes back blank), but I can do so on the AD/DC:
> > getent passwd Administrator
> > HPRS\administrator:*:0:10000:Administrator:/home/HPRS/administrator:/bin/bash
> > Is there some setting in the NAS smb.conf that will fix this?
> > Here is my smb.conf on the NAS:
> > # Global parameters
> > [global]
> > netbios name = OHPRSSTORAGE
> > server string = HPRS NAS server
> > domain master = no
> > prefered master = no
> > realm = HPRS.LOCAL
> > workgroup = HPRS
> > usershare allow guests = Yes
> > usershare max shares = 10
> > security = ADS
> > template shell = /bin/bash
> > max log size = 10000
> > load printers = no
> > printing = bsd
> > printcap name = /dev/null
> > disable spoolss = yes
> > idmap config *:backend = tdb
> > idmap config *:range = 2000-9999
> > idmap config HPRS:backend = ad
> > idmap config HPRS:schema_mode = rfc2307
> > idmap config HPRS:range = 10000-10099
> > winbind enum groups = Yes
> > winbind enum users = Yes
> > winbind nss info = rfc2307
> > winbind offline logon = Yes
> > winbind refresh tickets = Yes
> > winbind use default domain = Yes
> > [Backups]
> > comment = HPRS domain current backup respository
> > path = /mnt/RAID/Backups
> > public = yes
> > guest ok = yes
> > guest only = yes
> > writeable = yes
> > browseable= yes
> > printable = no
> > force user = ohprso
> > force group = ohprs
> > create mask = 0660
> > directory mask = 2771
> Mark, from a quick search, slackware 14.2 uses Samba 4.6.16 at maximum,
> this is EOL as far as Samba is concerned.
> There is nothing you can do to get Administrator to log into a Unix
> domain member, but you can map Administrator to the root user. Add this
> line to your smb.conf:
> username map = /etc/samba/user.map
> Create /etc/samba/user.map containing just this:
> !root = HPRS\Administrator
> Coming back to your smb.conf and the [Backups] share in particular, you
> should remove 'public = yes', it means the same as 'guest ok = yes'.
> However, you might as well also remove 'guest ok = yes' and 'guest only
> = yes' because you do not have 'map to guest = bad user' set in
> [global], so you will not get any guest access ;-)
Thanks for the feedback. I am removed 'public = yes', 'guest ok = yes' and 'guest only = yes'
from my [Backups] section, but problem ...
While Windows users could still map the [Backups] mount, the Acronis Backup on ALL office
workstations failed. Acronis has the destination as a sub-folder of [Backups]. When I put those
directives back, the backups succeeded.
I'm no expert at smb.conf by any stretch. I adapted these settings from kjhambrick's smb.conf
at LinuxQuestions.org. These public/guest setting must be needed for some reason.
Before I go to the trouble of adding that 'user map' directive, how will that work? Will the
remote samba client have to use 'root' as the login credential or 'Administrator'? If, when
mapping the drive, the (WIN7) client can use Administrator's credentials, that will work for
what I want. If the client has to use root, that's probably not going to work.
Also, this Slackware 14.2 NAS system is running Samba 4.6.16. The Slackware 14.2 AD/DC is running 4.8.2.
For my purposes, does that matter? Should I upgrade the NAS to 4.8.2?
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