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References: | <CANV9t=SSyof86c5Yz3tNhwj4To=eKnrmveQcr59ZmMY-X9_txA AT mail DOT gmail DOT com> <20190124154533 DOT GK2802 AT calimero DOT vinschen DOT de> |
In-Reply-To: | <20190124154533.GK2802@calimero.vinschen.de> |
From: | Bill Stewart <bstewart AT iname DOT com> |
Date: | Thu, 24 Jan 2019 09:48:17 -0700 |
Message-ID: | <CANV9t=RAGYEqEXi3SHDR397TzvE9O3AUGaMJMCzk+_d3uM1d+Q@mail.gmail.com> |
Subject: | Re: sshd permits logon using disabled user? |
To: | cygwin AT cygwin DOT com |
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? It still allows logon with disabled account. Thanks, Bill On Thu, Jan 24, 2019 at 8:45 AM Corinna Vinschen <corinna-cygwin AT cygwin DOT 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
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