# Dynamische Portforwarding

### Gobetween auf dem Host (Wirt) installieren

```
curl -L -O https://github.com/yyyar/gobetween/releases/download/0.6.1/gobetween_0.6.1_linux_amd64.tar.gz
tar xzf gobetween_0.6.1_linux_amd64.tar.gz 
mv gobetween /usr/local/sbin/
mkdir /etc/gobetween
mv config/gobetween.toml /etc/gobetween/config.example.toml
```

{% code title="/etc/systemd/system/gobetween.service " %}

```
[Unit]
Description=TCP/UDP Forwarding and loadbalancing service
ConditionFileIsExecutable=/usr/local/sbin/gobetween

[Service]
StartLimitInterval=5
StartLimitBurst=10
ExecStart=/usr/local/sbin/gobetween "-c" "/etc/gobetween/gobetween.toml"

User=root

Restart=always
RestartSec=120
EnvironmentFile=-/etc/sysconfig/gobetween

[Install]
WantedBy=multi-user.target


```

{% endcode %}

Konfigurieren Sie die gobetween HTTP API, so dass Salt-Minions dynamische Portforwardings per API anlegen können.

{% code title="/etc/gobetween/gobetween.toml" %}

```
[logging]
level = "info"
output = "/var/log/gobetween.log"

[defaults]
max_connections = 0              # Maximum simultaneous connections to the server
client_idle_timeout = "0"        # Client inactivity duration before forced connection drop
backend_idle_timeout = "0"       # Backend inactivity duration before forced connection drop
backend_connection_timeout = "0" # Backend connection timeout (ignored in udp)[servers]

[api]
enabled = true  # true | false
bind = "192.168.122.1:1500"  # "host:port"
cors = false    # cross-origin resource sharing
```

{% endcode %}

Starten Sie gobetween mit `systemctl start gobetween`.

### Firewall anpassen

Falls eine Firewall aktiv ist, erlauben Sie gobetween die Nutzung einer Portrange und öffnen Sie den API port

```bash
ufw allow 30000:30300/tcp 
ufw allow from 192.168.122.0/24 to any port 1500
ufw reload
```

### Portforwarding per Salt-State ausrollen

{% code title="/srv/salt/vminit/portforwarding.sls" %}

```yaml
#
# Create a port forwarding to a vm using gobetween on the default gw
#


# Copy the gobetween client
/usr/local/bin/gobetween-cli:
  file.managed:
    - source: salt://vminit/gobetween-cli.py
    - user: root
    - mode: 755

# Call the client and create a portforwarding on the default gw
forward:
  cmd.run:
    - name: /usr/local/bin/gobetween-cli {{ grains['ip4_gw'] }} 22
    - stateful: True
    - requires:
      - file: /usr/local/bin/gobetween-cli

```

{% endcode %}

{% file src="<https://3666581685-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-LFRZJPZX11pwB1staCp%2F-Lae7yWO0lLf6scRV6ol%2F-Laq4cD25VXHgwXkvTKH%2Fgobetween-cli.py?alt=media&token=8f3af03f-60f2-49de-936f-46d90546b5e5>" %}
gobetween-cli.py
{% endfile %}


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