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Subject: Will all SIDs fit into |SECURITY_MAX_SID_SIZE| bytes ? / was: Re:
 Switching groups with newgrp - how to get the new group with
 |GetTokenInformation()| ?
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From: Roland Mainz via Cygwin <cygwin AT cygwin DOT com>
Reply-To: Roland Mainz <roland DOT mainz AT nrubsig DOT org>
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On Thu, Feb 22, 2024 at 8:11 PM Corinna Vinschen via Cygwin
<cygwin AT cygwin DOT 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);
[snip]

Win32/NT API question: All known SIDs will fit into
|SECURITY_MAX_SID_SIZE| bytes, right ? I'm asking because right now
the ms-nfs41-client code assumes that all SIDs use a variable amount
of memory, and we always have to ask the Win32/NT API about the number
of bytes to allocate. If |SECURITY_MAX_SID_SIZE| is the global maximum
limit for all Windows versions, then we could simplify the code a
lot...

----

Bye,
Roland
-- 
  __ .  . __
 (o.\ \/ /.o) roland DOT mainz AT nrubsig DOT org
  \__\/\/__/  MPEG specialist, C&&JAVA&&Sun&&Unix programmer
  /O /==\ O\  TEL +49 641 3992797
 (;O/ \/ \O;)

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