samba - Feb 2019 - Computer Management - Share Security - No Read Access

---
Marco J. Shmerykowsky, P.E.
marco at sce-engineers.com

--------------------------------------------
     Shmerykowsky Consulting Engineers
        Structural Analysis & Design
      102 West 38th Street, 2nd Floor
         New York, New York 10018
   Tel. (212)719-9700 Fax. (212)719-4822
        http://www.sce-engineers.com
--------------------------------------------

On 2019-02-19 4:22 pm, Rowland Penny via samba wrote:
> On Tue, 19 Feb 2019 16:13:27 -0500
> Marco Shmerykowsky <marco at sce-engineers.com> wrote:
> 
>> 
>> On 2019-02-19 3:47 pm, Rowland Penny via samba wrote:
>> > On Tue, 19 Feb 2019 15:25:51 -0500
>> 
>> >> What exactly does "START AGAIN" imply? Just chmod?
>> >
>> > 'ls' shows the correct ownership and Unix permissions:
>> >
>> > drwxrwx---+  4 root          domain admins 4096 Feb 17 19:13
>> > programs
>> >
>> > But 'getfacl' show something different:
>> >
>> > getfacl: Removing leading '/' from absolute path names
>> > # file: server
>> > # owner: root
>> > # group: root
>> > user::rwx
>> > group::r-x
>> > other::r-x
>> >
>> > So what I am suggesting is that you use 'setfacl' to
remove the
>> > extended ACL's, it is the only thing I can see different
between my
>> > working system and your non-working system
>> >
>> > Rowland
>> 
>> root at machine253:/server# setfacl -b /server/users
>> 
>> root at machine253:/server# chmod 0770 /server/programs
>> root at machine253:/server# ls -l
>> total 20
>> drwxrwx--- 4 root          domain admins 4096 Feb 17 19:13 programs
>> 
>> 
>> root at machine253:/server# getfacl /server/programs
>> getfacl: Removing leading '/' from absolute path names
>> # file: server/programs
>> # owner: root
>> # group: domain\040admins
>> user::rwx
>> group::rwx
>> other::---
>> 
>> No Change
> 
> When you say 'No Change' I take it you mean that it is still not
> working from Windows, because there is a change on the Unix side,
> 'Domain Admins' now has the required Unix permissions.
Correct.  In Computer Manager I can not access anything on the
share except for the share permissions.

I've also been trying to create "user directory" using %LogonUser%
via a group profile.  That deosn't seem to be working, but I don't
know if it's related.
> 
> One other thing, I cannot remember asking if Apparmor or Selinux is
> installed and enabled.
> 
> Rowland
I tried sestatus and apparmor_status and bith returned 'command not 
found'
so I assume they're not running.  I installed Debian 9 from the LiveCD
with the cinnamon desktop.

On Tue, 19 Feb 2019 16:42:44 -0500
Marco Shmerykowsky <marco at sce-engineers.com> wrote:
> 
> 
> ---
> Marco J. Shmerykowsky, P.E.
> marco at sce-engineers.com
> 
> --------------------------------------------
>      Shmerykowsky Consulting Engineers
>         Structural Analysis & Design
>       102 West 38th Street, 2nd Floor
>          New York, New York 10018
>    Tel. (212)719-9700 Fax. (212)719-4822
>         http://www.sce-engineers.com
> --------------------------------------------
> 
> On 2019-02-19 4:22 pm, Rowland Penny via samba wrote:
> > On Tue, 19 Feb 2019 16:13:27 -0500
> > Marco Shmerykowsky <marco at sce-engineers.com> wrote:
> > 
> >> 
> >> On 2019-02-19 3:47 pm, Rowland Penny via samba wrote:
> >> > On Tue, 19 Feb 2019 15:25:51 -0500
> >> 
> >> >> What exactly does "START AGAIN" imply? Just
chmod?
> >> >
> >> > 'ls' shows the correct ownership and Unix
permissions:
> >> >
> >> > drwxrwx---+  4 root          domain admins 4096 Feb 17 19:13
> >> > programs
> >> >
> >> > But 'getfacl' show something different:
> >> >
> >> > getfacl: Removing leading '/' from absolute path
names
> >> > # file: server
> >> > # owner: root
> >> > # group: root
> >> > user::rwx
> >> > group::r-x
> >> > other::r-x
> >> >
> >> > So what I am suggesting is that you use 'setfacl' to
remove the
> >> > extended ACL's, it is the only thing I can see different
between
> >> > my working system and your non-working system
> >> >
> >> > Rowland
> >> 
> >> root at machine253:/server# setfacl -b /server/users
> >> 
> >> root at machine253:/server# chmod 0770 /server/programs
> >> root at machine253:/server# ls -l
> >> total 20
> >> drwxrwx--- 4 root          domain admins 4096 Feb 17 19:13
programs
> >> 
> >> 
> >> root at machine253:/server# getfacl /server/programs
> >> getfacl: Removing leading '/' from absolute path names
> >> # file: server/programs
> >> # owner: root
> >> # group: domain\040admins
> >> user::rwx
> >> group::rwx
> >> other::---
> >> 
> >> No Change
> > 
> > When you say 'No Change' I take it you mean that it is still
not
> > working from Windows, because there is a change on the Unix side,
> > 'Domain Admins' now has the required Unix permissions.
> 
> Correct.  In Computer Manager I can not access anything on the
> share except for the share permissions.
> 
> I've also been trying to create "user directory" using
%LogonUser%
> via a group profile.  That deosn't seem to be working, but I don't
> know if it's related.
> > 
> > One other thing, I cannot remember asking if Apparmor or Selinux is
> > installed and enabled.
> > 
> > Rowland
> 
> I tried sestatus and apparmor_status and bith returned 'command not 
> found'
> so I assume they're not running.  I installed Debian 9 from the LiveCD
> with the cinnamon desktop.
OK, it is late here, but just in case something has changed, I will set
up a new Debian 9 VM tommorrow, install the distro Samba Packages and
follow the Samba wiki page.

Can you confirm that you are using Samba from Debian 9.
You seem to be using '/server' as the shared directory, is this
correct ?
What Windows version are you using ? (I know you may have already said,
but it saves me looking it up)

Rowland

>> On 2019-02-19 4:22 pm, Rowland Penny via samba wrote:
>> > On Tue, 19 Feb 2019 16:13:27 -0500
>> > Marco Shmerykowsky <marco at sce-engineers.com> wrote:
>> >
>> >>
>> >> On 2019-02-19 3:47 pm, Rowland Penny via samba wrote:
>> >> > On Tue, 19 Feb 2019 15:25:51 -0500
>> >>
>> >> >> What exactly does "START AGAIN" imply? Just
chmod?
>> >> >
>> >> > 'ls' shows the correct ownership and Unix
permissions:
>> >> >
>> >> > drwxrwx---+  4 root          domain admins 4096 Feb 17
19:13
>> >> > programs
>> >> >
>> >> > But 'getfacl' show something different:
>> >> >
>> >> > getfacl: Removing leading '/' from absolute path
names
>> >> > # file: server
>> >> > # owner: root
>> >> > # group: root
>> >> > user::rwx
>> >> > group::r-x
>> >> > other::r-x
>> >> >
>> >> > So what I am suggesting is that you use 'setfacl'
to remove the
>> >> > extended ACL's, it is the only thing I can see
different between
>> >> > my working system and your non-working system
>> >> >
>> >> > Rowland
>> >>
>> >> root at machine253:/server# setfacl -b /server/users
>> >>
>> >> root at machine253:/server# chmod 0770 /server/programs
>> >> root at machine253:/server# ls -l
>> >> total 20
>> >> drwxrwx--- 4 root          domain admins 4096 Feb 17 19:13
programs
>> >>
>> >>
>> >> root at machine253:/server# getfacl /server/programs
>> >> getfacl: Removing leading '/' from absolute path names
>> >> # file: server/programs
>> >> # owner: root
>> >> # group: domain\040admins
>> >> user::rwx
>> >> group::rwx
>> >> other::---
>> >>
>> >> No Change
>> >
>> > When you say 'No Change' I take it you mean that it is
still not
>> > working from Windows, because there is a change on the Unix side,
>> > 'Domain Admins' now has the required Unix permissions.
>> 
>> Correct.  In Computer Manager I can not access anything on the
>> share except for the share permissions.
>> 
>> I've also been trying to create "user directory" using
%LogonUser%
>> via a group profile.  That deosn't seem to be working, but I
don't
>> know if it's related.
>> >
>> > One other thing, I cannot remember asking if Apparmor or Selinux
is
>> > installed and enabled.
>> >
>> > Rowland
>> 
>> I tried sestatus and apparmor_status and bith returned 'command not
>> found'
>> so I assume they're not running.  I installed Debian 9 from the
LiveCD
>> with the cinnamon desktop.
> 
> OK, it is late here, but just in case something has changed, I will set
> up a new Debian 9 VM tommorrow, install the distro Samba Packages and
> follow the Samba wiki page.
> 
> Can you confirm that you are using Samba from Debian 9.
> You seem to be using '/server' as the shared directory, is this
> correct ?
> What Windows version are you using ? (I know you may have already said,
> but it saves me looking it up)
> 
> Rowland
Debian 9 -> uname -r -> 4.9.0-8-686

This is the iso I used: 
https://cdimage.debian.org/debian-cd/current-live/amd64/iso-hybrid/debian-live-9.8.0-amd64-cinnamon.iso

Windows 10 (version 1803)

The file directory for the various shares is '/server'

I suggest you start with : 
1770 /server	(+ creator owner ) 
3770 /server/programs ( + creator owner + creator group. ) 

Then check again with getfacl


Greetz, 

Louis 
> -----Oorspronkelijk bericht-----
> Van: samba [mailto:samba-bounces at lists.samba.org] Namens 
> Marco Shmerykowsky via samba
> Verzonden: dinsdag 19 februari 2019 23:13
> Aan: Rowland Penny
> CC: samba at lists.samba.org
> Onderwerp: Re: [Samba] Computer Management - Share Security - 
> No Read Access
> 
> 
> >> On 2019-02-19 4:22 pm, Rowland Penny via samba wrote:
> >> > On Tue, 19 Feb 2019 16:13:27 -0500
> >> > Marco Shmerykowsky <marco at sce-engineers.com> wrote:
> >> >
> >> >>
> >> >> On 2019-02-19 3:47 pm, Rowland Penny via samba wrote:
> >> >> > On Tue, 19 Feb 2019 15:25:51 -0500
> >> >>
> >> >> >> What exactly does "START AGAIN" imply?
Just chmod?
> >> >> >
> >> >> > 'ls' shows the correct ownership and Unix
permissions:
> >> >> >
> >> >> > drwxrwx---+  4 root          domain admins 4096 Feb
17 19:13
> >> >> > programs
> >> >> >
> >> >> > But 'getfacl' show something different:
> >> >> >
> >> >> > getfacl: Removing leading '/' from absolute
path names
> >> >> > # file: server
> >> >> > # owner: root
> >> >> > # group: root
> >> >> > user::rwx
> >> >> > group::r-x
> >> >> > other::r-x
> >> >> >
> >> >> > So what I am suggesting is that you use
'setfacl' to
> remove the
> >> >> > extended ACL's, it is the only thing I can see 
> different between
> >> >> > my working system and your non-working system
> >> >> >
> >> >> > Rowland
> >> >>
> >> >> root at machine253:/server# setfacl -b /server/users
> >> >>
> >> >> root at machine253:/server# chmod 0770 /server/programs
> >> >> root at machine253:/server# ls -l
> >> >> total 20
> >> >> drwxrwx--- 4 root          domain admins 4096 Feb 17 
> 19:13 programs
> >> >>
> >> >>
> >> >> root at machine253:/server# getfacl /server/programs
> >> >> getfacl: Removing leading '/' from absolute path
names
> >> >> # file: server/programs
> >> >> # owner: root
> >> >> # group: domain\040admins
> >> >> user::rwx
> >> >> group::rwx
> >> >> other::---
> >> >>
> >> >> No Change
> >> >
> >> > When you say 'No Change' I take it you mean that it
is still not
> >> > working from Windows, because there is a change on the Unix
side,
> >> > 'Domain Admins' now has the required Unix
permissions.
> >> 
> >> Correct.  In Computer Manager I can not access anything on the
> >> share except for the share permissions.
> >> 
> >> I've also been trying to create "user directory"
using %LogonUser%
> >> via a group profile.  That deosn't seem to be working, but I
don't
> >> know if it's related.
> >> >
> >> > One other thing, I cannot remember asking if Apparmor or 
> Selinux is
> >> > installed and enabled.
> >> >
> >> > Rowland
> >> 
> >> I tried sestatus and apparmor_status and bith returned
'command not
> >> found'
> >> so I assume they're not running.  I installed Debian 9 
> from the LiveCD
> >> with the cinnamon desktop.
> > 
> > OK, it is late here, but just in case something has 
> changed, I will set
> > up a new Debian 9 VM tommorrow, install the distro Samba 
> Packages and
> > follow the Samba wiki page.
> > 
> > Can you confirm that you are using Samba from Debian 9.
> > You seem to be using '/server' as the shared directory, is
this
> > correct ?
> > What Windows version are you using ? (I know you may have 
> already said,
> > but it saves me looking it up)
> > 
> > Rowland
> 
> Debian 9 -> uname -r -> 4.9.0-8-686
> 
> This is the iso I used: 
> https://cdimage.debian.org/debian-cd/current-live/amd64/iso-hy
brid/debian-live-9.8.0-amd64-cinnamon.iso
> 
> Windows 10 (version 1803)
> 
> The file directory for the various shares is '/server'
> 
> -- 
> To unsubscribe from this list go to the following URL and read the
> instructions:  https://lists.samba.org/mailman/options/samba
> 
>

Oeps. missed this .
 
> 
> The file directory for the various shares is '/server'
> 
> -- 
> To unsubscribe from this list go to the following URL and read the
> instructions:  https://lists.samba.org/mailman/options/samba
> 
Then setup 
3770 on /server
3770 on /server/programs

You want your "domain admins" member to have write access in /server

On Tue, 19 Feb 2019 22:05:12 +0000
Rowland Penny via samba <samba at lists.samba.org> wrote:
> OK, it is late here, but just in case something has changed, I will
> set up a new Debian 9 VM tommorrow, install the distro Samba Packages
> and follow the Samba wiki page.
> 
> Can you confirm that you are using Samba from Debian 9.
> You seem to be using '/server' as the shared directory, is this
> correct ?
> What Windows version are you using ? (I know you may have already
> said, but it saves me looking it up)
> 
> Rowland
> 
OK, it (as I expected) works, I will clean up my notes and send the OP
a copy.

Rowland

On Wed, 20 Feb 2019 09:11:23 -0500
Marco Shmerykowsky <marco at sce-engineers.com> wrote:
> 
> Interesting....
> 
> It seems that there is something that "lingers" with
> respect to a share definition.
> 
> I had also created a "users" share.  No amount of tweaking
> seemed to allow the Security tab to assign permissions.
> 
> However, I noticed that if I removed the share in samba
> & restarted. The share disappeared in "Computer Management."
> Seem logical.
> 
> I reactivated the share in smb.conf, restarted samba and
> the share reappeared in "Computer Management".  It also
> had the same Share Level permissions set as before.
> 
> I thought that removal and redefinition of the share
> would clear any permissions.  The '+' never appears
> on the permissions of the directory on the Linux side.
> 
> So.... I renamed the share in smb.conf from [users] to
> [personal].
> 
> Same directory (/server/users).
> Same permissions (0770).
> Same ownership (root:"Domain Admins")
> 
> restarted samba.  Back to "Computer Management"
> Suddenly, full access to everything - just like it's supposed to.
> 
> Any explanation?
Not really, unless 'users' is a Windows name that cannot be used
elsewhere in the domain.

Rowland

On 2019-02-20 7:12 am, Rowland Penny wrote:
> On Wed, 20 Feb 2019 11:02:55 +0000
> Rowland Penny via samba <samba at lists.samba.org> wrote:
> 
>> On Tue, 19 Feb 2019 22:05:12 +0000
>> Rowland Penny via samba <samba at lists.samba.org> wrote:
>> 
>> > OK, it is late here, but just in case something has changed, I
will
>> > set up a new Debian 9 VM tommorrow, install the distro Samba
>> > Packages and follow the Samba wiki page.
>> >
>> > Can you confirm that you are using Samba from Debian 9.
>> > You seem to be using '/server' as the shared directory, is
this
>> > correct ?
>> > What Windows version are you using ? (I know you may have already
>> > said, but it saves me looking it up)
>> >
>> > Rowland
>> >
>> 
>> OK, it (as I expected) works, I will clean up my notes and send the OP
>> a copy.
>> 
>> Rowland
Sorry to be a pain on this, but something just refuses to work
as I would expect.  I've tried the following:

1) remove the share definition from smb.conf
2) Restart smbd
3) Remove (delete) the share directory from Linux
4) Check "Computer Management" on windows - Share is Gone
5) mkdir -p /server/share-files
6) chown root:"Domain Admins" /server/share-files
7) chmod 0770 /server/share-files
8) getfacl /server/share-files
    -> permissions match 0770
8) Restore (un-comment) share definition in smb.conf
    -> [share-files]
    ->     path = /server/share-files
    ->     read only = no
9) smbcontrol all reload-config
10) restart smbd
11) Go into "Computer Management" on windows & get to
     "Shares" on machine253

Here is what I find odd.  The "Share permissions" tab lists
one of the groups I previously defined.  It is not a windows
"built-in" group.  I created it using samba-tool on the AD.

If I removed the share and then recreated it, I would expect
a 'default' listing of groups.  Instead I seem to be getting a
previous "historical" group listing if I reuse the same
share names or directory names.

Two more things:

After all of this clicking and changing, I do not get the
'+' on the directory permissions.  It still reads as a
basic 0770.  It seems having this in the share is critical
to normal behavior.  At least once that appeared on my
other server - those shares started exhibiting normal
behavior.

Second, I've discovered that if I add the "Everyone" group
to the "Share Permissions" then suddenly I can modify
the Security tab.  If I remove the "Everyone group" then
it eventually reverts to giving me the following error:

"You must have Read permissions to view the properties
  of this object" where the object in question
is "\\Machine253\share.

Nothing is appearing in the log.smbd file after the last

"daemon_ready: STATUS=daemon 'smbd' finished starting up and ready
to
serve connections "

Thoughts?

On Thu, 21 Feb 2019 10:39:47 -0500
Marco Shmerykowsky <marco at sce-engineers.com> wrote:
> 
> On 2019-02-20 7:12 am, Rowland Penny wrote:
> > On Wed, 20 Feb 2019 11:02:55 +0000
> > Rowland Penny via samba <samba at lists.samba.org> wrote:
> > 
> >> On Tue, 19 Feb 2019 22:05:12 +0000
> >> Rowland Penny via samba <samba at lists.samba.org> wrote:
> >> 
> >> > OK, it is late here, but just in case something has changed,
I
> >> > will set up a new Debian 9 VM tommorrow, install the distro
Samba
> >> > Packages and follow the Samba wiki page.
> >> >
> >> > Can you confirm that you are using Samba from Debian 9.
> >> > You seem to be using '/server' as the shared
directory, is this
> >> > correct ?
> >> > What Windows version are you using ? (I know you may have
already
> >> > said, but it saves me looking it up)
> >> >
> >> > Rowland
> >> >
> >> 
> >> OK, it (as I expected) works, I will clean up my notes and send
> >> the OP a copy.
> >> 
> >> Rowland
> 
> Sorry to be a pain on this, but something just refuses to work
> as I would expect.  I've tried the following:
> 
> 1) remove the share definition from smb.conf
> 2) Restart smbd
> 3) Remove (delete) the share directory from Linux
> 4) Check "Computer Management" on windows - Share is Gone
> 5) mkdir -p /server/share-files
> 6) chown root:"Domain Admins" /server/share-files
> 7) chmod 0770 /server/share-files
> 8) getfacl /server/share-files
>     -> permissions match 0770
> 8) Restore (un-comment) share definition in smb.conf
>     -> [share-files]
>     ->     path = /server/share-files
>     ->     read only = no
> 9) smbcontrol all reload-config
> 10) restart smbd
If you do '9', you don't need to do '10'

> 11) Go into "Computer Management" on windows & get to
>      "Shares" on machine253
> 
> Here is what I find odd.  The "Share permissions" tab lists
> one of the groups I previously defined.  It is not a windows
> "built-in" group.  I created it using samba-tool on the AD.
Ignore the 'shares' tab, just use the 'security' tab, for which
a
better name would be 'NTFS permissions'
> 
> If I removed the share and then recreated it, I would expect
> a 'default' listing of groups.  Instead I seem to be getting a
> previous "historical" group listing if I reuse the same
> share names or directory names.
> 
> Two more things:
> 
> After all of this clicking and changing, I do not get the
> '+' on the directory permissions.  It still reads as a
> basic 0770.  It seems having this in the share is critical
> to normal behavior.  At least once that appeared on my
> other server - those shares started exhibiting normal
> behavior.
> 
> Second, I've discovered that if I add the "Everyone" group
> to the "Share Permissions" then suddenly I can modify
> the Security tab.  If I remove the "Everyone group" then
> it eventually reverts to giving me the following error:
As I said above, ignore the 'Share' tab, leave 'Everyone' there.
I go now to update the wiki page (again).

Rowland