RE: EXTERNAL SENDER: Re: Cygwin 3.4.9 - how to install ssh-keygen

["Dale Lobb (Sys Admin)" <Dale.Lobb@bryanhealth.org>]

> -----Original Message-----
> From: Cygwin <cygwin-bounces+dale.lobb=bryanhealth.org@cygwin.com>
> On Behalf Of Matthias--- via Cygwin
> Sent: Friday, November 24, 2023 5:32 AM
> To: cygwin@cygwin.com
> Subject: EXTERNAL SENDER: Re: Cygwin 3.4.9 - how to install ssh-keygen
>
> Am Montag, dem 20.11.2023 um 17:54 +0100 schrieb mailto:Matthias@gmx.li:
> > Dear all,
> >
> > I've installed cygwin 3.4.9-1 in my virtualbox running on Windows 10.
> > After installing defaults plus openssh 9.5p 1-1, I open the Cygwin64-
> Terminal as Administrator and
> > run ssh-host-config.
> >  * Answered "yes" to create the /etc/ssh_config and /etc/sshd_config
> >  * Answered "no" to use StrictMode
> >  * and "yes" to install sshd as a service
> >  * I just press <enter> for the question for "Value of CYGWIN for the daemon".
> > cygrunsrv -S cygsshd will not start the sshd. The logfile say "no hostkeys available".
> >
> > Unfortunately  I can't find ssh-keygen in the installable packages.
> > Howto install ssh-keygen or how to create hostkeys?
> >
> > Thanks in advance
> > Matthias
> >
> Hello,
>
> I installed cygwin 3.4.9-1 with all defaults plus openssh 9.5p 1-1 plus rsync
> 3.2.7-1 in my virtualbox running on Windows 10 again.
>
> In /var/log/setup.log I found "can't run /etc/postinstall/openssl.sh: No such file"
> Anyhow, I opened the Cygwin64-Terminal as Administrator and run ssh-host-config
> but no host-keys has been created:
>    $ ssh-host-config
>
>    *** Info: Generating missing SSH host keys
>    *** Info: Creating default /etc/ssh_config file
>    *** Info: Creating default /etc/sshd_config file
>
>    *** Info: StrictModes is set to 'yes' by default.
>    *** Info: This is the recommended setting, but it requires that the POSIX
>    *** Info: permissions of the user's home directory, the user's .ssh
>    *** Info: directory, and the user's ssh key files are tight so that
>    *** Info: only the user has write permissions.
>    *** Info: On the other hand, StrictModes don't work well with default
>    *** Info: Windows permissions of a home directory mounted with the
>    *** Info: 'noacl' option, and they don't work at all if the home
>    *** Info: directory is on a FAT or FAT32 partition.
>    *** Query: Should StrictModes be used? (yes/no) no
>    *** Info: Updating /etc/sshd_config file
>
>    *** Query: Do you want to install sshd as a service?
>    *** Query: (Say "no" if it is already installed as a service) (yes/no) yes
>    *** Query: Enter the value of CYGWIN for the daemon: []
>
>    *** Info: The sshd service has been installed under the LocalSystem
>    *** Info: account (also known as SYSTEM). To start the service now, call
>    *** Info: `net start cygsshd' or `cygrunsrv -S cygsshd'.  Otherwise, it
>    *** Info: will start automatically after the next reboot.
>
>    *** Info: Host configuration finished. Have fun!
>
>    $ ls -alh /etc/ssh*
>    -rw-r--r-- 1 SYSTEM Administratoren 1.5K Nov 24 12:02 /etc/ssh_config
>    -rw-r--r-- 1 SYSTEM Administratoren 3.1K Nov 24 12:02 /etc/sshd_config
>
> Also running ssh-user-config don't create any keys:
>    $ ssh-user-config
>    *** Query: Shall I create a SSH2 RSA identity file for you? (yes/no) yes
>    *** Info: Generating /home/meyer/.ssh/id_rsa
>    *** Query: Do you want to use this identity to login to this machine?
> (yes/no) yes
>    *** Info: Adding to /home/meyer/.ssh/authorized_keys
>    cat: /home/meyer/.ssh/id_rsa.pub: No such file or directory
>    *** Query: Shall I create a SSH2 DSA identity file for you? (yes/no) no
>    *** Query: Shall I create a SSH2 ECDSA identity file for you? (yes/no) no
>    *** Query: Shall I create a (deprecated) SSH1 RSA identity file for you?
> (yes/no) no
>
>    *** Info: Configuration finished. Have fun!
>
>    $ ls -alh $HOME/.ssh
>    total 4.0K
>    drwxr-xr-x 1 meyer Kein 0 Nov 24 12:11 .
>    drwxr-xr-x 1 meyer Kein 0 Nov 24 12:11 ..
>    -rw-r--r-- 1 meyer Kein 0 Nov 24 12:11 authorized_keys
>
> An indication of an installation/configuration error of ssh-keygen is that also
>    /usr/bin/ssh-keygen -vvf /etc/ssh_host_rsa_key -N '' -t rsa
> don't produce any output. Also if it has return value 0. BTW: Windows
> OpenSSH isn't installed on my
> machine.
>
> René Berber wrote that my files have the wrong permissions. But for shure,
> /home and /home/meyer has
> been created during cygwin installation and /home/meyer/.ssh by ssh-user-
> config.
>
> Which permissions the directories and files should have?
> What could the reason be that ssh-keygen don't create any key? Looks like it
> wouldn't try it?
>
> Thanks in advance
> Matthias
>
>

Try this and look to the end.  Is there  perhaps a segmentation fault error?

        $ strace ssh-keygen

  I have a VM with Cygwin installed in it, which used to work for all the installed
packages.  However, after a recent update, all binaries linked to openssl now
produce silent segmentation faults.  Could be happening to you too.

Best Regards,

Dale

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