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Configuring WSL as a ControlMaster relay server: Difference between revisions
Configuring WSL as a ControlMaster relay server (view source)
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{{Warning|title=Disclaimer |content=This is still an experimental procedure (work in progress). | <!--T:1--> | ||
{{Warning|title=Disclaimer |content=This is still an experimental procedure (work in progress).<br><br> | |||
If you have suggestions, please write to [[technical support]].}} | |||
=== Install Linux on Windows with WSL === | <!--T:21--> | ||
With this procedure you can leverage ControlMaster under WSL so you may log into the clusters with several apps under native Windows for a certain period without having to use multifactor authentication for every session. | |||
=== Install Linux on Windows with WSL === <!--T:2--> | |||
Please follow this link for more detailed instructions: | |||
https://docs.alliancecan.ca/wiki/Windows_Subsystem_for_Linux_(WSL) | https://docs.alliancecan.ca/wiki/Windows_Subsystem_for_Linux_(WSL) | ||
<!--T:3--> | |||
This setup assumes the following on the sample config files: | This setup assumes the following on the sample config files: | ||
* you selected Ubuntu as your distribution | * you selected Ubuntu as your distribution | ||
* the hostname for the WSL instance is <i>ubuntu</i> | * the hostname for the WSL instance is <i>ubuntu</i>: <i>/etc/hostname</i> contains <i>ubuntu</i> and <i>/etc/hosts</i> contains <i>127.0.0.1 localhost ubuntu</i> | ||
* the Windows system is named <i>smart</i> and the login name is <i>jaime</i> | * the Windows system is named <i>smart</i> and the login name is <i>jaime</i> | ||
* the user name on the Ubuntu VM is also <i>jaime</i> | * the user name on the Ubuntu VM is also <i>jaime</i> | ||
* the Alliance user name is <i>pinto</i> and | * the Alliance user name is <i>pinto</i> and we want to connect to Cedar | ||
=== Install additional packages === | === Install additional packages === <!--T:4--> | ||
<pre> | <pre> | ||
sudo apt update && sudo apt upgrade -y | sudo apt update && sudo apt upgrade -y | ||
sudo apt install openssh-server -y | sudo apt install openssh-server -y | ||
</pre> | |||
You may log in from Windows to Ubuntu with <code>ssh localhost</code>. | |||
=== General idea of the setup === <!--T:5--> | |||
=== General idea of the setup === | |||
<pre> | <pre> | ||
[ssh client] ----> [ssh relay server] ----> [ssh target server] | [ssh client] ----> [ssh relay server] ----> [ssh target server] | ||
| Line 32: | Line 37: | ||
</pre> | </pre> | ||
=== Log into the Ubuntu VM and create a <i>custom_ssh</i> folder === | === Log into the Ubuntu VM and create a <i>custom_ssh</i> folder === <!--T:6--> | ||
<pre> | <pre> | ||
jaime@ubuntu:~$ cat custom_ssh/sshd_config | jaime@ubuntu:~$ cat custom_ssh/sshd_config | ||
| Line 44: | Line 49: | ||
PidFile /home/jaime/custom_ssh/sshd.pid | PidFile /home/jaime/custom_ssh/sshd.pid | ||
</pre> | </pre> | ||
You may copy the ''ssh_host'' keys from ''/etc/ssh'' with: | |||
<pre>sudo cp /etc/ssh/ssh_host_ed25519_key /home/jaime/custom_ssh/</pre> | <pre>sudo cp /etc/ssh/ssh_host_ed25519_key /home/jaime/custom_ssh/</pre> | ||
=== Customize <i>.ssh/config</i> on Ubuntu === | === Customize <i>.ssh/config</i> on Ubuntu === <!--T:7--> | ||
<pre> | <pre> | ||
jaime@ubuntu:~$ cat ~/.ssh/config | jaime@ubuntu:~$ cat ~/.ssh/config | ||
| Line 58: | Line 63: | ||
</pre> | </pre> | ||
=== Customize the authorized keys === | === Customize the authorized keys === <!--T:8--> | ||
<pre> | <pre> | ||
jaime@ubuntu:~/custom_ssh$ cat /home/jaime/custom_ssh/authorized_keys | jaime@ubuntu:~/custom_ssh$ cat /home/jaime/custom_ssh/authorized_keys | ||
| Line 64: | Line 69: | ||
</pre> | </pre> | ||
<!--T:9--> | |||
Use the same public SSH key that you uploaded to CCDB. | |||
=== Now start the sshd server on Ubuntu === | === Now start the sshd server on Ubuntu === <!--T:10--> | ||
<pre> | <pre> | ||
jaime@ubuntu:~/custom_ssh$ /usr/sbin/sshd -f ${HOME}/custom_ssh/sshd_config | jaime@ubuntu:~/custom_ssh$ /usr/sbin/sshd -f ${HOME}/custom_ssh/sshd_config | ||
</pre> | </pre> | ||
<!--T:11--> | |||
Make sure you start the server as yourself, not as root. | |||
You will also need to start the sshd server every time you restart your computer, or after closing or restarting WSL. | You will also need to start the sshd server every time you restart your computer, or after closing or restarting WSL. | ||
=== Customize <i>.ssh/config</i> on <i>smart</i> with <code>RemoteCommand</code> === | === Customize <i>.ssh/config</i> on <i>smart</i> with <code>RemoteCommand</code> === <!--T:12--> | ||
<pre> | <pre> | ||
jaime@smart ~/.ssh cat config | jaime@smart ~/.ssh cat config | ||
| Line 82: | Line 89: | ||
</pre> | </pre> | ||
=== You are now ready to try to log into Cedar === | === You are now ready to try to log into Cedar === <!--T:13--> | ||
<pre> | <pre> | ||
jaime@smart ~ | jaime@smart ~ | ||
| Line 96: | Line 103: | ||
</pre> | </pre> | ||
=== Alternative setup === | === Alternative setup === <!--T:14--> | ||
There is another way in which you could customize the authorized keys on Ubuntu and the <i>~/.ssh/config</i> on Windows such that it may work better for some Windows GUI apps that don't let you explicitly set the <code>RemoteCommand</code> (such as WinSCP). In this case you set the <code>RemoteCommand</code> on the public key: | There is another way in which you could customize the authorized keys on Ubuntu and the <i>~/.ssh/config</i> on Windows such that it may work better for some Windows GUI apps that don't let you explicitly set the <code>RemoteCommand</code> (such as WinSCP). In this case you set the <code>RemoteCommand</code> on the public key: | ||
<pre> | <pre> | ||
| Line 102: | Line 109: | ||
command="ssh cedar" ssh-ed25519 AAAZDINzaC1lZDI1NTE5AAC1lZDIvqzlffkzcjRAaMQoTBrPe5FxlSAjRAaMQyVzN+A+ | command="ssh cedar" ssh-ed25519 AAAZDINzaC1lZDI1NTE5AAC1lZDIvqzlffkzcjRAaMQoTBrPe5FxlSAjRAaMQyVzN+A+ | ||
<!--T:15--> | |||
jaime@smart ~/.ssh cat config | jaime@smart ~/.ssh cat config | ||
Host ubuntu | Host ubuntu | ||
| Line 108: | Line 116: | ||
</pre> | </pre> | ||
You may still <code>ssh ubuntu -p 2222</code> after that from a shell on Windows. | <!--T:16--> | ||
You may still use <code>ssh ubuntu -p 2222</code> after that from a shell on Windows. | |||
=== Setup with MobaXterm === | === Setup with MobaXterm === <!--T:17--> | ||
<!--T:18--> | |||
[[File:MobaXterm-setup.jpg]] | [[File:MobaXterm-setup.jpg]] | ||
<!--T:19--> | |||
[[File:MobaXterm-VSL-localdriveC.jpg]] | [[File:MobaXterm-VSL-localdriveC.jpg]] | ||
</translate> | </translate> | ||
<!-- | |||
=== Outstanding challenges === | === Outstanding challenges === | ||
With this setup you may be prompt for MFA duo authentication only on the first session. Subsequently multiple SSH sessions can be started on Cedar without MFA. This also works fine to get remote shells on Cedar from several apps running natively on Windows. We already tried for WinSCP, but we can assume it will work for other apps with some tweaks. | With this setup you may be prompt for MFA duo authentication only on the first session. Subsequently multiple SSH sessions can be started on Cedar without MFA. This also works fine to get remote shells on Cedar from several apps running natively on Windows. We already tried for WinSCP, but we can assume it will work for other apps with some tweaks. | ||
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Therefore, I probably need a hand from some of you to figure this out. Alliance staff members could post suggestions in the security-mfa channel. Users in general please send email to support with the subject "WSL, ControlMaster/MFA suggestion". Thanks | Therefore, I probably need a hand from some of you to figure this out. Alliance staff members could post suggestions in the security-mfa channel. Users in general please send email to support with the subject "WSL, ControlMaster/MFA suggestion". Thanks | ||
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