[Samba] Domain Member Server (wheezy) - Unable to edit permissions of share without usermapping - shall I add to Wiki?
Shane Robinson
srobinson at simpeq.ca
Wed Mar 4 11:31:13 MST 2015
Hello again Rowland, list!
Sorry for the delayed response, and top posting.
To recap:
I'd like to complete the member server wiki so that ACLs can be set from
windows without taking undocumented steps.
The three ways I've found to do this are:
1) map root to administrator. (LPH VanBelle's script uses this option.)
2) chmod 0775 then chgrp "<DOMAIN>\Domain Admins" /srv/share
3) chown -R "<DOMAIN>\Administrator" /srv/share
I'm leaning towards 2, but would like a better idea of pros and cons so I
may complete the wiki.
Rowland: From your last response, I was searching for how the ID_TYPE_BOTH
relates to the above, and found a recent thread between yourself and Andrew
(Samba4,idmap.ldb & ID_TYPE_BOTH), last posted to on Feb24. The differences
you point out W.R.T. sysvol appear to relate more to that thread.
If those differences are important to my current issue, I apologize for
being obtuse, but would you mind explaining?
Otherwise, List, please let me know which of the above options you prefer
and why. I will then document them to the best of my knowledge on the wiki.
Thank you kindly,
Shane Robinson
Chief Administrative Officer
SimpeQ Care Inc.
t. 604.988.3103 ext. 104
c. 604.506.3311
f. 604.988.3105
Please consider the environment before printing this email.
-----Original Message-----
From: samba-bounces at lists.samba.org [mailto:samba-bounces at lists.samba.org]
On Behalf Of Rowland Penny
Sent: Friday, February 27, 2015 1:36 PM
To: samba at lists.samba.org
Subject: *****SPAM***** Re: [Samba] Domain Member Server (wheezy) - Unable
to edit permissions of share without usermapping - shall I add to Wiki?
On 27/02/15 21:00, Shane Robinson wrote:
> Hi Rowland,
>
> I'm also not an expert, but with the amount of help you provide on the
> list, I will defer to you.
>
> I'd love to know your rational for prefering the "change ownership to
> administrator" approach over the "change group to Domain Admins approach".
> If it's just gut, that's fine too!
>
> Thanks!
>
>
> -----Original Message-----
> From: samba-bounces at lists.samba.org
> [mailto:samba-bounces at lists.samba.org]
> On Behalf Of Rowland Penny
> Sent: Friday, February 27, 2015 12:44 PM
> To: samba at lists.samba.org
> Subject: *****SPAM***** Re: [Samba] *****SPAM***** Re: Domain Member
> Server
> (wheezy) - Unable to edit permissions of share without usermapping -
> shall I add to Wiki?
>
> On 27/02/15 20:07, Shane Robinson wrote:
>> Hi Rowland,
>>
>> Chown to Administrator seems less flexible than Chgrp to Domain
>> Admins on the face of it. You could add/remove users from the Domain
>> Admins group, which allows/denies them the ability to change the
>> permissions on the
> share.
>> By changing the owner to Administrator, only those credentials would
>> have that ability, no?
>>
>> What advantages do you predict with the change owner approach? What
>> disadvantages do you see to the change group approach?
>>
>> Thank you!
>>
>> -----Original Message-----
>> From: samba-bounces at lists.samba.org
>> [mailto:samba-bounces at lists.samba.org]
>> On Behalf Of Rowland Penny
>> Sent: Friday, February 27, 2015 11:51 AM
>> To: samba at lists.samba.org
>> Subject: *****SPAM***** Re: [Samba] Domain Member Server (wheezy) -
>> Unable to edit permissions of share without usermapping - shall I add to
Wiki?
>>
>> On 27/02/15 19:46, Shane Robinson wrote:
>>> Hello all,
>>>
>>> Sorry about the top-posting.
>>>
>>> I have added the bit about the linking (YAY!, I'm helping!).
>>>
>>> Now if we can clear up the ACL issue, this will be a great day!
>>>
>>> Summary: To edit ACL's from Windows on a Debian Member server, we
>>> need to either
>>> 1) map the domain admin to root OR
>>> 2) give explicit permissions to Domain Admins with a chmod 0755 and
>>> chgrp "MYDOM\Domain Admins"
>>>
>>> Which is better and why?
>>>
>>> Thanks everyone!
>>>
>>> Shane
>>>
>>> -----Original Message-----
>>> From: samba-bounces at lists.samba.org
>>> [mailto:samba-bounces at lists.samba.org]
>>> On Behalf Of Rowland Penny
>>> Sent: Friday, February 27, 2015 11:25 AM
>>> To: samba at lists.samba.org
>>> Subject: *****SPAM***** Re: [Samba] Domain Member Server (wheezy) -
>>> Unable to edit permissions of share without usermapping - shall I
>>> add to
>> Wiki?
>>> On 27/02/15 19:09, Shane Robinson wrote:
>>>> Hello again List, Marc, and Louis!
>>>>
>>>> I'm afraid my message from yesterday may have been TL;DR. The short
>>>> version is as follows:
>>>>
>>>> Following the wiki's for AD member server (building from source on
>>>> Debian
>>>> Wheezy) and Setting up shares with Windows acls did not give the
>>>> expected results
>>>>
>>>> First, I needed to link libnss_winbind.so to
>>>> /usr/lib/x86_64-linux-gnu for winbind to work. Marc - may I add
>>>> this to the wiki, or is there a reason not to that I'm unaware of?
>>> I think this would be a good idea, the problem is the wiki is a bit
>>> RH centric, so go ahead and add something about setting the link for
>>> debian, but follow the format that is already there, don't worry if
>>> it isn't quite right, Marc will change it.
>>>
>>>> Second, setting permissions on a share did not work until I mapped
>>>> the domain administrator to root. This is mentioned in the
>>>> Troubleshooting member server wiki page, but only in relation to
>>>> granting the SeDiskOperatorPrivilege, which was not an issue for me.
>>>>
>>>> Does this mapping have any ramifications that I (or others) should
>>>> be aware of?
>>> No, but I don't think it has to be done this way, I am beginning to
>>> think there are other ways of doing this.
>>>
>>> Rowland
>>>
>>>> The other way to allow ACL changes from windows (which I did on my
>>>> now-defunct member File Servers) was something like this:
>>>> "sudo chmod 0775 /srv/myshare" and
>>>> "sudo chgrp 'Domain Admins' /srv/myshare"
>>>> .. which as result will give full access to the members of the
>>>> group "MYDOM\Domain Admins"
>>>>
>>>> Is one better than the other?
>>>>
>>>> If you'd like any further information, I'd be happy to provide it.
>>>>
>>>> Thank you very much for your help!
>>>>
>>>> PS - I included Louis in the TO line because of your unanswered
>>>> email of February 16th ("Samba_Member_Server_Troubleshooting").
>>>>
>>>>
>>>> Shane Robinson
>>>> Chief Administrative Officer
>>>> SimpeQ Care Inc.
>>>> t. 604.988.3103 ext. 104
>>>> c. 604.506.3311
>>>> f. 604.988.3105
>>>> Please consider the environment before printing this email.
>>>>
>>>>
>>>> -----Original Message-----
>>>> From: Shane Robinson [mailto:srobinson at simpeq.ca]
>>>> Sent: Thursday, February 26, 2015 11:17 AM
>>>> To: 'samba at lists.samba.org'
>>>> Subject: Wheezy member Server - Unable to edit permissions of share
>>>> without usermapping - shall I add to Wiki?
>>>>
>>>> Hello List!
>>>>
>>>> I have a Samba AD domain with two virtualized DC's running 4.1.15
>>>> and 4.1.17. I have had two member file servers with odd permissions
>>>> problems that I've now given up on, and decided to start fresh.
>>>>
>>>> I have created a File server (FS3) with Debian wheezy, built samba
>>>> 4.1.17 from source, with configure options of :
>>>> --with-ads --with-shared-modules=idmap_ad
>>>>
>>>> ... and placed the attached smb.conf into /usr/local/samba/etc/ . I
>>>> successfully joined it to the domain, and set up the shared
>>>> directories as defined in the aforementioned smb.conf.
>>>>
>>>> I followed the AD Member Server setup wiki page, and getent passwd
>>>> "INTERNAL\<domain user>" works, as does getent group and wbinfo.
>>>> The SeDiskOperatorPrivilege was granted to the administrator without
issue.
>>>>
>>>> The file system is ext4, mounted with user_xattr,acl,barrier=1. I
>>>> have tried to follow the wiki to the letter, with one exception,
>>>> linking libnss_winbind.so to /usr/lib/x86_64-linux-gnu in addition
>>>> to
>> /lib64.
>>>> As the domain administrator, from a Win7 member, I was able to give
>>>> Domain Admins full control in the "Share Permissions" tab (from
>>>> Computer Management).
>>>>
>>>> Upon trying to give Domain Admins full control to the share, I get
>>>> an Access Denied error (as in the screenshot attached).
>>>>
>>>> The log.smbd (level 8) of that interaction is also attached.
>>>>
>>>> The "Setup and Configure file shares with Windows ACLs" wiki page
>>>> has a troubleshooting section which mentions trying:
>>>>
>>>> setfacl -R -m default:group:domain\ admins:rwx /srv/sites
>>>>
>>>> ... so I did. The result of getfacl is now:
>>>>
>>>> shane at FS3:/usr/local/samba$ sudo getfacl /srv/sites
>>>> getfacl: Removing leading '/' from absolute path names # file:
>>>> srv/sites #
>>>> owner: root # group: root user::rwx group::r-x other::r-x
>>>> default:user::rwx default:group::r-x
>>>> default:group:domain\040admins:rwx
>>>> default:mask::rwx
>>>> default:other::r-x
>>>>
>>>> ... but the access denied error persists.
>>>>
>>>> As a list subscriber for a few years, I recalled Louis van Belle
>>>> publishing a samba4 wheezy member script. Within the smb.conf it
>>>> defines, I find that the username map option.
>>>>
>>>> I added the username map option to the smb.conf of FS3, and created
>>>> the mapping file with:
>>>>
>>>> !root = "INTERNAL\Administrator" "INTERNAL\administrator"
>>>>
>>>> Upon trying this, I have success. (yay!)
>>>>
>>>>
>>>>
>>>> SO: The script is now relegated to an "old_set_of_scripts"
>>>> repository, so I'm not sure if this is still the Right Thing to do.
>>>>
>>>> Are there ramifications to this mapping that need to be considered?
>>>>
>>>> Is this a debian-specific issue, like the libnss_winbind.so linking?
>>>>
>>>> Are there any reasons that I should NOT add these steps to the wiki
>>>> (I have a logon already, and I'm just itching to use it)?
>>>>
>>>>
>>>> Thank you in advance for any and all help you are able to provide!
>>>>
>>>> Shane Robinson
>>>> Chief Administrative Officer
>>>> SimpeQ Care Inc.
>>>> t. 604.988.3103 ext. 104
>>>> c. 604.506.3311
>>>> f. 604.988.3105
>>>> Please consider the environment before printing this email.
>>>>
>>>>
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>>> instructions: https://lists.samba.org/mailman/options/samba
>>>
>> there is a third way, the one I am coming round to thinking is the
>> best
> way,
>> give Administrator a proper uidNumber and change ownership to
> Administrator
>> not root.
>>
>> Rowland
>>
>> --
>> To unsubscribe from this list go to the following URL and read the
>> instructions: https://lists.samba.org/mailman/options/samba
>>
> The thing is (and I am no expert here by any means), I don't think
> that windows gives a flying fig just who owns anything as long as the
> ACL contains an ACE giving who or whatever the correct access rights,
> so by making a directory owned by Administrator (with a uidNumber that
> isn't 0), he could then set the correct ACLs from windows.
>
> Rowland
>
If you look inside idmap.ldb you will find 'ID_TYPE_BOTH', I am reliably
informed that is there because a windows group has to own files in sysvol.
>From my investigations, the group appears to be Administrators and the file
is actually the 'Policies' directory and what is in it.
From my further investigations, it appears it doesn't matter who owns
'Policies' 'Administrator' or 'Administrators' and if 'Administrators'
doesn't need to own anything, then 'ID_TYPE_BOTH' doesn't need to exist and
the ACLs on sysvol go from this:
getfacl /var/lib/samba/sysvol/
getfacl: Removing leading '/' from absolute path names # file:
var/lib/samba/sysvol/ # owner: root # group: 3000000 user::rwx user:root:rwx
user:3000000:rwx user:3000001:r-x user:3000002:r-x user:3000003:rwx
group::rwx group:3000000:rwx group:3000001:r-x group:3000002:r-x
group:3000003:rwx mask::rwx
other::---
default:user::rwx
default:user:root:rwx
default:user:3000000:rwx
default:user:3000001:r-x
default:user:3000002:r-x
default:user:3000003:rwx
default:group::---
default:group:3000000:rwx
default:group:3000001:r-x
default:group:3000002:r-x
default:group:3000003:rwx
default:mask::rwx
default:other::---
To this:
getfacl /var/lib/samba/sysvol/
getfacl: Removing leading '/' from absolute path names # file:
var/lib/samba/sysvol/ # owner: HOME\134Administrator # group: 3000000
user::rwx user:3000002:rwx user:HOME\134Administrator:rwx group::rwx
group:3000000:rwx group:3000001:r-x group:3000003:r-x mask::rwx
other::---
default:user::rwx
default:user:3000002:rwx
default:user:HOME\134Administrator:rwx
default:group::---
default:group:3000000:rwx
default:group:3000001:r-x
default:group:3000003:r-x
default:mask::rwx
default:other::---
That answer you question ?
Rowland
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