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Date: Sat, 23 Sep 2023 10:02:17 -0400
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Subject: Re: Shell API to get Windows SID from Cygwin name?
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From: "Allen, Norton T. via Cygwin" <cygwin AT cygwin DOT com>
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On 9/22/2023 11:11 PM, Brian Inglis wrote:
> On 2023-09-22 18:15, Allen, Norton T. via Cygwin wrote:
>> On 9/22/2023 8:07 AM, Brian Inglis via Cygwin wrote:
>>> On 2023-09-21 23:58, Martin Wege via Cygwin wrote:
>>>> Does Cygwin have a shell (e.g. bash) API to lookup the Windows SID for
>>>> a given Cygwin user or group name?
>>>> /usr/bin/getent usersid thisisausername
>>>
>>> Forget Windows! Think Unix:
>>>
>>> $ getent passwd $USER    # sanitized output:
>>> $USER:*:$UID:545:U-$HOSTNAME/$USER,S-1-5-21-...-...-...-1001:$HOME:/bin/bash 
>>>
>>>
>> According to the man page, getent passwd takes a numeric UID, not a 
>> user name. But if you don't provide a UID, it basically lists what 
>> would be in /etc/passwd, which you could parse to locate the row you 
>> want by username.
>
> [IIRC getent evolved from SunOS YellowPages/YP/NIS/+ facilities and 
> commands as LANs, sites, and orgs required more central control and 
> distribution than could easily be managed using text files 
> /etc/{hosts,protocols,services,networks,...}, while requiring 
> flexibility to allow some local setup and configurable priority 
> depending on system roles, provided by the Name Services Switch 
> /etc/nsswitch.conf.]
>
> I checked all distro man pages I can find online and have locally, and 
> from SunOS and Solaris, key lookup and other features were supported 
> from the early days, while BSDs appear to use GNU (glibc) getent (or 
> at least its man page), as does Linux.
>
> All data sources support lookup by non-numeric key get...nam....(3), 
> some by numeric key get...id(3), and some support enumeration 
> set...ent(3), get...ent(3), end...ent(3), e.g.
>
> $ man getent
> ...
> passwd    When no key is provided, use
>     setpwent(3), getpwent(3), and endpwent(3)
>     to enumerate the passwd database.
>     When one or more key arguments are provided, pass each
>     numeric key to getpwuid(3) and each
>     nonnumeric key to getpwnam(3)
>     and display the result.
>     On Cygwin the key can also be a Windows SID.
> ...
>
> Perhaps you were thinking of POSIX id(1p) which only takes a user 
> login name?
>
Sorry, you are entirely correct. I tried with my username and got 
nothing. Then I remembered I have a different username on this system.



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