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Message-ID: <f1382f4f-cc14-413f-8cff-6b72cf54b4a7@SystematicSW.ab.ca>
Date: Sat, 9 Nov 2024 11:59:29 -0700
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Subject: Re: Stable SIDs for "None"+'"Administrator" ?
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To: cygwin AT cygwin DOT com
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From: Brian Inglis via Cygwin <cygwin AT cygwin DOT com>
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Attached a list of stable and local passwd and group sids that might be of use.

Note the digit groups after -21- and -80- ids are variable.

No id what some of the numbers are!

-- 
Take care. Thanks, Brian Inglis              Calgary, Alberta, Canada

La perfection est atteinte                   Perfection is achieved
non pas lorsqu'il n'y a plus rien à ajouter  not when there is no more to add
mais lorsqu'il n'y a plus rien à retirer     but when there is no more to cut
                                 -- Antoine de Saint-Exupéry


On 2024-11-09 11:25, Christian Franke via Cygwin wrote:
> Roland Mainz via Cygwin wrote:
>> On Sat, Nov 9, 2024 at 6:00 PM Corinna Vinschen via Cygwin wrote:
>>> On Nov  9 17:31, Roland Mainz via Cygwin wrote:
>>>> Does anyone know a list of SIDs which can be used to get the
>>>> user+group accounts for passwd entry "Adminstrator" and group entry
>>>> "None" ?
>>>>
>>>> Our problem is that the actual account names vary with the system
>>>> locale, e.g. group entry "None" is "Kein" in "de_DE",  "Aucun" in
>>>> fr_FR etc. ...
>>>> ... so far we thought we fixed this by doing a lookup via SID, and
>>>> then remembering the localised name.
>>>>
>>>> But: The SIDs are apparently not stable between Windows versions.
>>>> For example:
>>>> ---- snip ----
>>>> # Windows Server 2022/en
>>>> $ getent group None
>>>> None:S-1-5-21-168624908-967194555-3343779530-513:197121:
>>>> # Windows Server 2019
>>>> $ getent group None
>>>> None:S-1-5-21-3286904461-661230000-4220857270-513:197121
>>>> ---- snip ----
>>> They *are* stable in that they are
>>>
>>>    ${Machine-SID}-513
>>>
>>>> And if there is no such list, would $ mkgroup | egrep
>>>> ':S-1-5-21-.+-513:' # be a suitable workaround ?
>>> No.
>>>
>>>    ${AD-SID|-513 == "Domain Users"
>>>
>>> I have not the faintest idea what the MS guys were thinking at the time,
>>> calling the group "None".  This is basically the equivalent of "Domain
>>> Users" for local accounts on machines not being domain controller.  A
>>> useful name would have been "Local Users" or "Machine Users", but,
>>> well, it is what it is.
>>>
>>> The safe way to check the SID is to fetch the machine SID attach the RID
>>> 513, and check for equality.
>> How can I get the "machine SID", preferably using /usr/bin/getent,
>> /usr/bin/getconf or /proc ?
> 
> If domain info is excluded from mkgroup output, the one and only S-*-513 group 
> should contain the machine SID:
> 
> $ sid=$(mkgroup -l | sed -n 's/[^:]*:\(S-[-0-9]*\)-513:.*$/\1/p')
> 
> $ test $(wc -l <<<"$sid") = 1 || echo 'My assumption was wrong :-)'

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