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Date:	Wed, 7 Jan 2015 18:25:31 +0100
From:	Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To:	cygwin AT cygwin DOT com
Subject:	Re: SSHd configuration problems (System error 1376)
Message-ID:	<20150107172531.GA4190@calimero.vinschen.de>
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On Dec 29 11:30, Ken Brown wrote:
> On 12/29/2014 9:07 AM, Ilya Dogolazky wrote:
> > Hi Ken!
> >=20
> > I followed your advise:
> > 1) Reinstalled windows again
> > 2) Started setup_x86-64.exe from cygwin web site
> > 3) Changed two things in the package list:
> >   a) Changed version of package cygwin to 1.7.34.003
> >   b) Marked package "ssh" to be installed
> > 4) After installation started terminal (icon right click -> run as admi=
n)
> > 5) Typed "ssh-host-config -y"
> > 6) Copied the output and attached to this e-mail
> >=20
> > The same problem as before:
> >    System error 1376 has occurred.
> >    The specified local group does not exist.
> >    Adding user 'cyg_server' to local group 'root' failed!
> >=20
> > :-(
> >=20
> > By the way, very first message is quite funny: "it seems your account d=
oes not=20
> > have these privileges". According to windows UI my account (the only on=
e on this=20
> > fresh installed machine) is an administrative one.
>=20
> > $ ssh-host-config -y
> >=20
> > *** Warning: Running this script typically requires administrator privi=
leges!
> > *** Warning: However, it seems your account does not have these privile=
ges.
> > *** Warning: Here's the list of groups in your user token:
> >=20
> >     None
> >     root
> >     Users
>=20
> This output comes from the following code, starting at line 619:
>=20
> # Make sure the user is running in an administrative context
> admin=3D$(/usr/bin/id -G | /usr/bin/grep -Eq '\<544\>' && echo yes || ech=
o no)

You shouldn't discuss stuff like that when I'm on vacation :)

The aforementioned message is a result of a change in how the function
underlying `id' works.

For a start, the "root" group is created and added to the default
/etc/group file by the base-cygwin package.  I don't remember why we did
that in the first place, but given that /etc/group goes away, so will
the faked "root" group.  The next base-cygwin package will not generate
/etc/passwd or /etc/group file anymore anyway.

Assuming you have a "root" group in /etc/group (usually if you never
regenerated /etc/group), then `id' under 1.7.33 and earlier prints
*both* gids, 0 and 544.  Starting with 1.7.34 it only prints the first
group matching the S-1-5-32-544 SID, which is "0" with the default
/etc/group.

The old getgroups iterated through the groups from /etc/groups, and then
checked for each group if its SID is available in the user's token.

This behaviour only makes sense if there is a self-contained list of
groups in memory.  But the new code doesn't read all of /etc/group, or,
worse, all groups from the Windows account DB.  So the new, more logical
behaviour is to iterate over the groups in the user's token and then
checking for (or generating) a group entry for the SID.  So, in contrast
to the old code, the new code only generates a single group entry per
SID.

I hope we can get over that without having to tweak the ssh-host-config
script to explicitely check for a 0 gid...


Corinna

--=20
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat

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