[wip] add ssh support

[vitaliy-guliy]

What does this PR do?

It is a current state of the process of adding the Open SSH and the alternative dropbear to the developer container.

Open SSH

The configuration for Open SSH is copied to /opt/ssh/ directory to not being overwritten while workspace startup.
There is /opt/ssh/sshd_config config file and a set of generated ssh keys.

To start the service run /sshd.start script. It will regenerate /home/user/ssh/host_ed25519_key key and will start the service with writing all the output to /tmp/sshd.log.

Open another browser tab an try to connect to the server with /sshd.connect.

At the moment, there is an error appear while authenticate the user

PAM: do_pam_account pam_acct_mgmt = 9 (Authentication service cannot retrieve authentication info)

And the full trace is on the screeenshot

All the attempts to configure PAM in /etc/pam.d appeared to be overwritten by kubernetes when workspace is started.

Dropbear

To run the dropbear I created /projects/dropbear directory, generated two edcsa and rsa keys and launched service with

dropbear -FEwgsjk -r /projects/dropbear/dropbear_rsa_host_key -r /projects/dropbear/dropbear_ecdsa_host_key -P /projects/dropbear/dropbear.pid -p 2022

After that it become possible to use the same /sshd.connect script to connect to the service.
Or just use the command ssh -l user -p 2022 -i /home/user/ssh/host_ed25519_key 127.0.0.1.

Like with Open SSH, the login was failed

The output from the service

[14116] Feb 12 22:30:25 Not backgrounding
[14194] Feb 12 22:30:31 Child connection from 127.0.0.1:34192
[14194] Feb 12 22:30:31 Login attempt with wrong user user from 127.0.0.1:34192
[14194] Feb 12 22:30:31 Exit before auth (user 'user', 0 fails): Exited normally

and from the client

$ ssh -i /home/user/.ssh/ssh_host_rsa_key2 -p 2022 127.0.0.1
user@127.0.0.1: Permission denied (publickey).

What issues does this PR fix?

eclipse-che/che#22756

How to test this PR?

Click to create a workspace

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