From: Roland Mainz <roland.mainz@nrubsig.org>
To: cygwin@cygwin.com
Subject: Re: Switching groups with newgrp - how to get the new group with |GetTokenInformation()| ?
Date: Fri, 23 Feb 2024 14:03:27 +0100 [thread overview]
Message-ID: <CAKAoaQ=rCwVHnHAqfd5C3kC45GPE4ZHbbgCWrdM64sojLMuMyA@mail.gmail.com> (raw)
In-Reply-To: <ZdecXZNUgQ3i0hYN@calimero.vinschen.de>
On Thu, Feb 22, 2024 at 8:11 PM Corinna Vinschen via Cygwin
<cygwin@cygwin.com> wrote:
> On Feb 22 18:38, Roland Mainz via Cygwin wrote:
> > If I switch the current user's group with /usr/bin/newgrp, how can a
> > (native) Win32 process use
> > |GetTokenInformation(GetCurrentThreadToken(), ...)| to find out which
> > group is the new "current group" (e.g. which |TokenInformationClass|
> > should I use) ?
>
> PSID sidbuf = (PSID) alloca (SECURITY_MAX_SID_SIZE);
> NTSTATUS status;
> ULONG size;
>
> status = NtQueryInformationToken (hProcToken, TokenPrimaryGroup,
> sidbuf, SECURITY_MAX_SID_SIZE,
> &size);
Well, it works in the case of an "hello world" application, but if I
stuff that into the nfsd_daemon (NFSv4.1 ms-nfs41-client client
daemon) it always prints the default primary group, even if the
current thread should impersonate another user - or in this case even
the same user, but a different primary group (e.g. see
https://github.com/kofemann/ms-nfs41-client/blob/master/sys/nfs41_driver.c#L1367).
Do you have any idea what is going wrong in this case ?
----
Bye,
Roland
--
__ . . __
(o.\ \/ /.o) roland.mainz@nrubsig.org
\__\/\/__/ MPEG specialist, C&&JAVA&&Sun&&Unix programmer
/O /==\ O\ TEL +49 641 3992797
(;O/ \/ \O;)
next prev parent reply other threads:[~2024-02-23 13:03 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-02-22 17:38 Roland Mainz
2024-02-22 19:11 ` Corinna Vinschen
2024-02-23 13:03 ` Roland Mainz [this message]
2024-02-23 15:47 ` Corinna Vinschen
2024-02-23 18:45 ` Roland Mainz
2024-02-23 21:15 ` Dan Shelton
2024-02-24 13:11 ` Corinna Vinschen
2024-03-05 22:38 ` Dan Shelton
2024-03-06 13:01 ` Corinna Vinschen
2024-03-09 21:26 ` Glenn Strauss
2024-03-11 1:30 ` Dan Shelton
2024-03-11 3:49 ` Brian Inglis
2024-03-11 16:54 ` Corinna Vinschen
2024-03-11 1:28 ` Dan Shelton
2024-03-11 16:56 ` Corinna Vinschen
2024-04-19 23:44 ` Dan Shelton
2024-04-26 9:04 ` Andrey Repin
2024-02-24 16:57 ` Brian Inglis
2024-02-24 12:53 ` Corinna Vinschen
2024-02-24 14:38 ` Will all SIDs fit into |SECURITY_MAX_SID_SIZE| bytes ? / was: " Roland Mainz
2024-02-24 18:57 ` Corinna Vinschen
2024-02-25 21:04 ` Roland Mainz
2024-02-25 22:32 ` gs-cygwin.com
2024-02-26 4:17 ` gs-cygwin.com
2024-02-26 16:12 ` [EXTERNAL] " Lavrentiev, Anton (NIH/NLM/NCBI) [C]
2024-02-26 9:20 ` Corinna Vinschen
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