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Example bridging connections across two distinct Docker networks using
My real use case is something like a remote LDAP server that I don’t want to expose to the public internet and some metrics servers only available behind a VPN. This setup will allow me to create a proxy container on a host that will act as a local LDAP or HTTP server.
+----------+ +----------+ +----------+ | | | | | | | | | Firewall | | | | | | | | | | Local | tunnel +----------+ tunnel | Remote | | Computer |--------------------------------| SSH | | | +----------+ | Server | | | | | | | | | | Firewall | | | | | | | | | +----------+ +----------+ +----------+ | | | tunnel | | +----------+ | | | | | | | | | Remote | | Service | | | | | | | +----------+
Requires you to provide your own ssh keys as well as provide the local machine IP address
Dockamole is configured using environment variables:
# Required MOLE_LOCAL_? indexed local host and port MOLE_REMOTE_? indexed remote host and port MOLE_SERVER ssh server to connect to # Optional MAX_TUNNELS number of tunnels allowed (default 10) SSH_KEY path to ssh private key that should be used (default ~/.ssh/id_rsa) GEN_KNOWN_HOSTS determines if known hosts should be generated on first start (default 1)
This example provides a somewhat restricted sshd server as well. I would advise caution though as this is likely something that will have access to sensitive information.
The server should already be rejecting attempts at a getting a pty, but to be safe you should take precautions from someone logging into your server directly. In my example, I’m using the following as my
no-pty,no-X11-forwarding,command="/bin/echo do-not-send-commands" ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQDeG0iBsd5P9ZwDlav7mWaMGiq4SH5XvYGEGoZPgC3PjKgiEpe5lxH9p5lOFicqG7nNBaTwJwDPnJJaIIeHeCcpKF9f5RhTA5rwLkPcVIwZTh2GL7PD/yDmnsB1L8v04yTzjvJxHAi+xx+yN0fcxw2IOJ4k4FC1mNJKNwHZZHvzEyvRbC0GUB1K32dKSDUAWQHKx7xJqgtpkZ0DV78GzBfNUZcucImRwjQTBlJFumTjB5k0xUt0NRDLEkHwUMyiAeXB13tfjZipEHCWPxIrQnuwmV4Lb3VFbh8UqeObsarxG9t+SMoxnrKxQCAntcS0do1VjfiGr6usGVsV56ua8Tyj ifij@C02V7083HV2V
This prevents getting a shell if my key is ever leaked.
Additionally, if you are actually planning on doing this in production, take care when distributing or adding
known_hosts. By default, this client will auto generate a
known_hosts file for servers it hasn’t connected to before, but it’d be best to validate this yourself.