[Samba] Fwd: Need the ability to edit Samba SIDs.

Rowland penny rpenny at samba.org
Tue Jul 2 14:17:35 UTC 2019

On 02/07/2019 14:40, Zombie Ryushu wrote:
> On 07/02/2019 09:32 AM, Rowland penny via samba wrote:
>> On 02/07/2019 13:52, Zombie Ryushu via samba wrote:
>>> On 07/02/2019 06:10 AM, Rowland penny via samba wrote:
>>>> On 02/07/2019 10:31, Zombie Ryushu via samba wrote:
>>>>> I have a Samba problem with eGroupware. Samba 4 is screwing with my
>>>>> eGroupware UIDs causing Havoc. Samba 4 uses the last four Digits of
>>>>> the
>>>>> SID rather than the UID Number.
>>>> If you are running Samba as an AD DC, then Unix UID != RID (what you
>>>> are referring to as the 'last four Digits')
>>>>> ?? I need to know how to alter my user
>>>>> entry SID so that the last four digits of the SID is congruent with
>>>>> the
>>>>> UID Numbers of my users.
>>>> Do not even think of doing this, it will break AD.
>>>>> To fix this; I need the ability to edit the last digits of the SID.
>>>>> I've
>>>>> tried shutting down the Samba server and using ldbmodify, but that
>>>>> isn't
>>>>> working. The SiD is in some sort of strange Hash. pdbedit and
>>>>> samba-tool
>>>>> gives me the error: ?? - samldb: objectSid must not be specified!
>>>>> I'm, quickly approaching the need to re-provision my entire Domain,
>>>>> because I Have already corrected this stuff in my older OpenLDAP
>>>>> system.
>>>>> I'd have to re-run Classic Upgrade. I'd rather not lose all my
>>>>> progress.
>>>>> Please help!
>>>> Classicupgrade is probably the way to go.
>>>> Sounds like you need to tell us just how you are running Samba at the
>>>> moment.
>>>> Rowland
>>> I am running Samba 4 as an AD, on one system, but I have a legacy
>>> OpenLDAP system that runs Samba in NT PDC mode that I am migrating from.
>>> There are two Domain Controllers, one migrated, one is not.
>> You can only migrate from one NT4-style PDC (in fact you can only have
>> one PDC in a domain, multiple BDC's are allowed), so unless you have
>> two NT4-style domains, you can turn the PDC's off. If you do have two
>> NT4-style domains, then you will need to classicupgrade to two AD
>> domains.
>>> The origin of the wrong SIDs is actually OpenLDAP. The same SIDs were
>>> migrated over.
>> No, it sounds like they were the correct SID's
>>> eGroupware is one of the few programs with an outright Samba 4 (Active
>>> Directory) Mode.
>>> In OpenLDAP mode, eGroupware will use uidNumber. in Samba 4 AD mode,
>>> eGroupware will use the last digits of the SID to determine the
>>> eGroupware ID.
>> The last 4 digits of the SID are known as the RID, but seeing as
>> egroupware is a Unix package, why didn't they use the 'uidNumber' &
>> 'gidNumber' attributes, if you classicupgraded from an LDAP PDC, you
>> will have these in AD
>>> everything from E-mail ACLs for Thunderbird, to Calender Items and
>>> Contacts use this as a Primary key in its database.
>>> So what has been happening, is that if, say the Unix UID is 501, and the
>>> Object SID ends in 998, eGroupware will assume the UID is 998.
>> The SID shouldn't end in '998', all normal AD users, groups etc start
>> at '1000', it is the Windows 'system' users & groups that start at
>> 500, see here:
>> https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-dtyp/81d92bba-d22b-4a8c-908a-554ab29148ab
>> Rowland
> The rationale is that not every Samba AD is RFC2307 Compliant.
Whilst this is technically correct (you have to specify '--use-rfc2307' 
when provisioning), all the RFC2307 attributes are standard in the Samba 
AD schema.
> And you
> are right, All SIDs start at 1000 and go up, and most of my users have a
> UID of more than 1000 except for two. Never the less, I've tried the SQL
> method to fix this by selecting the Affected rows, and determine that to
> make a much bigger mess than I started out with.

You cannot change a SID, it is what identifies an object (user, group 
etc) in AD, it usually looks like this:


Everything but the 'AAAA' identifies the Domain, the 'AAAA' is what 
identifies the object to AD.

What are the two numbers (RID's) you wish to change ?


> Is there anyway to fix this? I have a rather large eGroupware database
> hanging onthis.

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