From: Corinna Vinschen <corinna-cygwin@cygwin.com>
To: cygwin@cygwin.com
Subject: Re: Switching groups with newgrp - how to get the new group with |GetTokenInformation()| ?
Date: Wed, 6 Mar 2024 14:01:06 +0100 [thread overview]
Message-ID: <ZehpEr18QUP6C3Ge@calimero.vinschen.de> (raw)
In-Reply-To: <CAAvCNcAEAr0gFdR_excafHq8+cYjDvf_APb1So-AAWGSu2+zTQ@mail.gmail.com>
On Mar 5 23:38, Dan Shelton via Cygwin wrote:
> On Sat, 24 Feb 2024 at 14:11, Corinna Vinschen via Cygwin
> <cygwin@cygwin.com> wrote:
> >
> > On Feb 23 22:15, Dan Shelton via Cygwin wrote:
> > > HOWEVER, there is another Cygwin bug:
> > > "getent group mywingrp1" does not list any group members, even after
> > > "net localgroup mywingrp1 mywinuser44 /add", which is a POSIX
> > > violation.
> >
> > Not a bug. Two problems:
> >
> > - Getting members of a group can be an extremly costly operation
> > in a domain or, worse, a domain forest, or even worse, if the
> > domain or domain forest is remote.
> >
> > - Alonmg the same lines, getting members of a group can be extremly
> > costly in big orgs with thousands of users. Nobody want's to clutter
> > up space with the list of members in the "Domain Users" group.
> >
> > - Permissions to enumerate members of a group are restricted.
> > By default only admins and group members are allow to enumerate
> > members and this can be restricted further by domain admins.
> >
> > Therefore we dropped even trying to populate gr_mem, considering
> > that even in its original form on Unix systems, it's used only
> > to add supplementary groups. To do this right on Windows is even
> > more costly than blindly enumerating.
> >
> > It's not a bug, it's a feature :)
>
> Could you add an option to getent so that the full lookup can be
> requested via command line, pls?
That's not possible. getent just calls getpwent/getgrent.
> Always editing /etc/nsswitch.conf
> forth and back is not a elegant solution, aside from race conditions
> with other users on a system
So, here we go again.
- What exactly are you trying to accomplish by enumerating the accounts?
Maybe you won't actually need it for your task at hand.
- Why do you have to change nsswitch.conf "back and forth"?
Just change it once and you're done.
Corinna
next prev parent reply other threads:[~2024-03-06 13:01 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
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 [this message]
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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