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<439a4aeb-e8f8-42c7-6c35-c303a9366368 AT cs DOT umass DOT edu> <14be4d61-0c8b-412d-9afe-c60f2e4b3b42 AT gmx DOT net> In-Reply-To: <14be4d61-0c8b-412d-9afe-c60f2e4b3b42@gmx.net> Date: Wed, 7 Feb 2024 06:34:13 +0100 Message-ID: Subject: Re: cygsshd fails due to bad ownership or modes of /cygdrive/c/Users To: Frank-Ulrich Sommer Cc: cygwin AT cygwin DOT com X-Spam-Status: No, score=0.1 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, FREEMAIL_FROM, RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_PASS, TXREP, T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org X-BeenThere: cygwin AT cygwin DOT com X-Mailman-Version: 2.1.30 List-Id: General Cygwin discussions and problem reports List-Archive: List-Post: List-Help: List-Subscribe: , From: marco atzeri via Cygwin Reply-To: marco atzeri Content-Type: text/plain; charset="utf-8" Sender: "Cygwin" Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from base64 to 8bit by delorie.com id 4175ZOr2005682 On Wed, Feb 7, 2024 at 3:26 AM Frank-Ulrich Sommer via Cygwin wrote: > On 06.02.2024 22:22, Brian Inglis via Cygwin wrote: > > On 2024-02-05 18:36, Eliot Moss via Cygwin wrote: > >> On 2/5/2024 8:28 PM, Frank-Ulrich Sommer via Cygwin wrote: > >>> On 05.02.2024 00:53, Frank-Ulrich Sommer via Cygwin wrote: > >>>> I'm trying to run cygsshd on my PC with Windows 11 and connect from a linux machine. I have added the public key to /cygdrive/c/Users/xxx/.ssh/authorized_keys and created a symbolic link from /cygdrive/c/Users/xxx/.ssh to /home/xxx/.ssh. As usual I checked the access rights and mode of the .ssh directory (700 and belongs to user xxx) and the authorized_keys file (600 and also belongs to user xxx) and also of the home directory (had to change ownership). > The problem seems to be that OpenSSH does not even arrive at checking the home diretory or the .ssh directory. It starts checking every directory in the path and fails already at "/cygdrive/c/Users". Now that I know how to get the sources I added debug output to the error message. OpenSSH sees this directory as belonging to user with UID 18 and it has mode 4750. Mode ist checked not to contain 0022 which is fine here. Then it checks that the owner is the correct system user and the only criteria is that the UID must be zero. Only for AIX and HPUX the user "bin" with UID 2 is also accepted. So this check fails and OpenSSH assumes that the directory does not belong to the correct privileged system user. > > I think the only way to fix this with the current OpenSSH is disabling strict mode, but normally I'm quite reluctant to do something like that.2 > what is the issue on using /home/USER/.ssh folder ? I prefer to leave the Cygwin Home and the Windows Home well separated to avoid this ACL collision $ set | grep -i ^home HOME=/home/matzeri HOMEDRIVE=C: HOMEPATH='\Users\matzeri' -- Problem reports: https://cygwin.com/problems.html FAQ: https://cygwin.com/faq/ Documentation: https://cygwin.com/docs.html Unsubscribe info: https://cygwin.com/ml/#unsubscribe-simple