From: Corinna Vinschen <corinna-cygwin@cygwin.com>
To: Bill Stewart <bstewart@iname.com>
Cc: cygwin@cygwin.com
Subject: Re: sshd permits logon using disabled user?
Date: Thu, 24 Jan 2019 20:23:00 -0000 [thread overview]
Message-ID: <20190124202340.GN2802@calimero.vinschen.de> (raw)
In-Reply-To: <CANV9t=RAGYEqEXi3SHDR397TzvE9O3AUGaMJMCzk+_d3uM1d+Q@mail.gmail.com>
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On Jan 24 09:48, Bill Stewart wrote:
> Hello Corinna,
>
> I performed the following steps:
>
> 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
>
> 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
>
> Thanks,
>
> Bill
>
>
> On Thu, Jan 24, 2019 at 8:45 AM Corinna Vinschen <corinna-cygwin@cygwin.com>
> wrote:
>
> > 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 for
> > > 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 account, 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
> >
>
> --
> Problem reports: http://cygwin.com/problems.html
> FAQ: http://cygwin.com/faq/
> Documentation: http://cygwin.com/docs.html
> Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple
--
Corinna Vinschen
Cygwin Maintainer
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next prev parent reply other threads:[~2019-01-24 20:23 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-24 13:28 Bill Stewart
2019-01-24 15:45 ` Corinna Vinschen
2019-01-24 15:51 ` Stefan Baur
2019-01-24 15:59 ` Corinna Vinschen
2019-01-24 16:16 ` Stefan Baur
2019-01-24 16:36 ` Corinna Vinschen
2019-01-24 17:01 ` Stefan Baur
2019-01-26 19:05 ` Andrey Repin
2019-01-24 16:49 ` Bill Stewart
2019-01-24 20:23 ` Corinna Vinschen [this message]
2019-01-24 20:37 ` Bill Stewart
2019-01-25 16:56 ` Corinna Vinschen
2019-01-24 17:52 ` Bill Stewart
2019-01-24 17:58 ` Stefan Baur
2019-01-24 18:13 ` Bill Stewart
2019-01-24 19:17 ` Wayne Davison
2019-01-24 19:22 ` Stefan Baur
2019-01-26 19:20 ` Andrey Repin
[not found] <1690850474.834980.1548391349102.ref@mail.yahoo.com>
2019-01-25 4:42 ` matthew patton via cygwin
2019-01-25 10:36 ` Stefan Baur
2019-01-25 15:34 ` Bill Stewart
2019-01-25 17:48 ` Stephen Paul Carrier
2019-01-25 18:03 ` Bill Stewart
2019-01-27 17:48 ` Sam Edge (Cygwin)
2019-01-27 22:10 ` Corinna Vinschen
2019-01-28 13:35 ` Sam Edge
2019-01-28 9:59 ` Corinna Vinschen
2019-01-28 15:02 ` Bill Stewart
2019-01-28 16:52 ` Corinna Vinschen
2019-01-28 17:19 ` Bill Stewart
2019-01-28 18:39 ` Corinna Vinschen
2019-01-28 20:14 ` Bill Stewart
2019-01-28 21:50 ` Bill Stewart
2019-01-28 22:24 ` Bill Stewart
2019-01-29 11:57 ` Corinna Vinschen
2019-01-29 12:12 ` Corinna Vinschen
2019-01-29 17:05 ` Corinna Vinschen
2019-01-29 18:18 ` Bill Stewart
2019-01-29 18:30 ` Corinna Vinschen
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