Des fois on en a besoin, lorsqu'on a pas encore fait les ouvertures de flux qui vont bien. J'ai trouvé un p'tit tuto qui marche bien ici

Je claque le code ici histoire de pas le perdre :P

Create a template service file at `/etc/systemd/system/[email protected]`. The template parameter will correspond to the name of target host:

[Unit]
Description=Setup a secure tunnel to %I
After=network.target
 
[Service]
Environment="LOCAL_ADDR=localhost"
EnvironmentFile=/etc/default/[email protected]%i
ExecStart=/usr/bin/ssh -NT -o ServerAliveInterval=60 -o ExitOnForwardFailure=yes -L ${LOCAL_ADDR}:${LOCAL_PORT}:localhost:${REMOTE_PORT} ${TARGET}
 
# Restart every >2 seconds to avoid StartLimitInterval failure
RestartSec=5
Restart=always
 
[Install]
WantedBy=multi-user.target

We need a configuration file (inside `/etc/default`) for each target host we will be creating tunnels for. For example, let's assume we want to tunnel to a host named `jupiter` (probably aliased in `/etc/hosts`). Create the file at `/etc/default/[email protected]`:

TARGET=jupiter
LOCAL_ADDR=0.0.0.0
LOCAL_PORT=20022
REMOTE_PORT=22

Note that for the above to work we need to have allready setup a password-less SSH login to target (e.g. by giving access to a non-protected private key).

Now we can start the service instance:

systemctl start secure-tunnel@jupiter.service
systemctl status secure-tunnel@jupiter.service

Or enable it, so it get's started at boot time:

systemctl enable secure-tunnel@jupiter.service

Pour forwarder un service d'une machine vers une autre il faut remplacer -L [...] par

[...] -R ${REMOTE_PORT}:localhost:${LOCAL_PORT} [...]

et ajouter

GatewayPorts yes

dans le /etc/ssh/sshd_config sur la machine distante pour autoriser SSH à pousser le port sur une autre interface que localhost

Du coup quand on fait un netstat ça marche :)

[root@myhost:~]# netstat -an |grep 8080
tcp        0      0 0.0.0.0:8080                0.0.0.0:*                   LISTEN
tcp        0      0 :::8080                     :::*                        LISTEN