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Date:	Thu, 24 Jan 2019 21:23:40 +0100
From:	Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To:	Bill Stewart <bstewart AT iname DOT com>
Cc:	cygwin AT cygwin DOT com
Subject:	Re: sshd permits logon using disabled user?
Message-ID:	<20190124202340.GN2802@calimero.vinschen.de>
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On Jan 24 09:48, Bill Stewart wrote:
> Hello Corinna,
>=20
> I performed the following steps:
>=20
> 1. Downloaded cygwin-20190124.tar.xz
> 2. Extracted it
> 3. Stopped sshd
> 4. Renamed existing /bin/cygwin1.dll to cygwin1-20181108.dll
> 5. Copied cygwin1.dll from download to /bin
> 6. Started sshd
>=20
> Did I miss anything?

No, I did.

> It still allows logon with disabled account.

I should have tested pubkey auth as well but as it was I just tested
with pathword auth.  These methods take slightly different paths in
Cygwin when trying to switch the user account.

I pushed another patch and created new snapshots in the same location
https://cygwin.com/snapshots/.


HTH,
Corinna


>=20
> Thanks,
>=20
> Bill
>=20
>=20
> On Thu, Jan 24, 2019 at 8:45 AM Corinna Vinschen <corinna-cygwin AT cygwin DOT c=
om>
> wrote:
>=20
> > On Jan 24 06:28, Bill Stewart wrote:
> > > I am running Windows 10 (1803) and experimenting with sshd installed =
as a
> > > Windows service.
> > >
> > > The computer is a domain member. I created a local computer account f=
or
> > > testing.
> > >
> > > I created host keys and a public/private key pair to use to log on the
> > user.
> > >
> > > This works, except I notice that if I disable the Windows user accoun=
t, I
> > > can still log on using ssh using that account.
> > >
> > > In the shell, logged on as the disabled user, the 'whoami' command
> > returns
> > > the name of the disabled user.
> > >
> > > This seems unexpected and not good.
> > >
> > > Why does sshd allow logon for a disabled user?
> >
> > Because the underlying Cygwin function responsible for changing the user
> > account only checks if the account exists.  It does not check for any of
> > the flags in the user DB.  Yet.
> >
> > I pushed a patch to disallow changing the user account to a disabled or
> > locked out account.
> >
> > I just uploaded new developer snapshots containing this change to
> > https://cygwin.com/snapshots/
> >
> > Please give them a try.
> >
> >
> > Thanks,
> > Corinna
> >
> > --
> > Corinna Vinschen
> > Cygwin Maintainer
> >
>=20
> --
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--=20
Corinna Vinschen
Cygwin Maintainer

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