Basic ssh_config support

[KnowZero]

What it does

Very basic support for ssh_config files and quick access to ssh_config hosts.

Currently only Host, Hostname, Port, User, and IdentityFile is supported. With Host allowing some wildcards which can be accessed through %h

How to test

Step 1:

Create an sh file with the following and run it, it will generate a ssh_config file and docker files and ssh keys to test with:

#!/bin/bash

# create docker-compose file
cat > ./docker-compose.yml << EOF
version: '3.8'
services:
    theia_ssh1:
        build:
            context: .
            args:
                SSH_PORT: "2221"
        ports:
            - 2221:2221
EOF

# create docker file with ssh server
cat > ./Dockerfile << \EOF
FROM ubuntu:latest
ARG SSH_PORT
RUN  mkdir ~/.ssh && apt-get update && apt-get install -y openssh-server xz-utils


COPY ./id_rsa.pub /root/.ssh/authorized_keys
RUN mkdir /var/run/sshd
RUN echo 'root:password' | chpasswd


RUN echo "PORT=${SSH_PORT}" \
    && sed -i 's/#PermitRootLogin prohibit-password/PermitRootLogin yes/' /etc/ssh/sshd_config \
    && sed -i "s/#Port 22/Port ${SSH_PORT}/" /etc/ssh/sshd_config

    
CMD ["/usr/sbin/sshd", "-D"]
EOF

# create ssh_config file file
cat > ./ssh_config << EOF
Host localhost
    Port 2221
    User root
Host test1
    Hostname 127.0.0.1
    Port 2221
Host test2_*
    Hostname %h.0.0.1
    Port 2221
Host test3_?
    Hostname 127.0.0.%h
    User root
    Compression yes
    Port 2221
Host test4
    Hostname 127.0.0.1
    Port 2221
    IdentityFile ${PWD}/id_rsa 

EOF

#generate key
ssh-keygen -t rsa -f "${PWD}/id_rsa" -q -P ""

Step 2:

set remote.ssh.configFile setting to point to config file generated

Step 3:

docker-compuse up

Step 4:

When connecting to remote host, you can either access them via typing like test1 or pick it in the quick access menu(Connect Current Window to Host in Config File). You can also do things like root@test1, default password is password. You can also test wildcard via root@test2_127 , test3_1 shows single character wildcard and test4 is key login without password

Follow-ups

Partly fixes #14102 and #14289

@jonah-iden

Breaking changes

• This PR introduces breaking changes and requires careful review. If yes, the breaking changes section in the changelog has been updated.

Attribution

Review checklist

• As an author, I have thoroughly tested my changes and carefully followed the review guidelines

Reminder for reviewers

• As a reviewer, I agree to behave in accordance with the review guidelines

[jonah-iden]

Hi, thanks for the contribution. It works great. I left a few suggestions.
Also it seems you havn't signed the eca yet. Would be great if you could do that otherwise we can not merge this for legal reasons

[KnowZero]

Hi, thanks for the contribution. It works great. I left a few suggestions. Also it seems you havn't signed the eca yet. Would be great if you could do that otherwise we can not merge this for legal reasons

I definitely signed it, same way I signed it before. It's weird/ Clicking it, it seems the sign verification is down?

[jonah-iden]

I definitely signed it, same way I signed it before. It's weird/ Clicking it, it seems the sign verification is down?

I was also under the asumption you did.
Doesn't seem to be down. I revalidated it and still seems to fail.
When you look at https://api.eclipse.org/git/eca/status/gh/eclipse-theia/theia/15499 ther are some troubleshooting steps, could you check those

[jonah-iden]

Doesn't seem to be down. I revalidated it and still seems to fail.

sorry i take that back. There actually seems to be a problem at eclipse right now with the eca validation

[KnowZero]

Doesn't seem to be down. I revalidated it and still seems to fail.

sorry i take that back. There actually seems to be a problem at eclipse right now with the eca validation

Validation seems to be fixed so I revalidated it

[KnowZero]

@jonah-iden Okay, I implemented ssh-config

[jonah-iden]

I did a few smaller improvements for the usage of SSH config. Hope that was ok. But this looks good to me now.