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SSH session initiated from a Nerves device behind firewall

/nerves#ssh#proxy
tomazbracic

tomazbracic

SSH session initiated from a Nerves device behind firewall

Hi,

Has anybody done and documented/blogged about the “reverse SSH proxy” or “SSH jump host” setup with a Nerves device?

I would like to set this up with a device on a 4G network. The device will be collecting some specific data but not pushing it forward in the whole capacity. If there will be a trigger I would like to send down a MQTT message to bring up a SSH tunnel and specific limits/configs for required data. But I would like to start the tunnel from a remote device side.

I was looking into NervesSSH, but couldn’t find anything there mentioning this.

Any suggestion would be appreciated.

Thanks in advance.

Tomaz

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lawik

lawik

Nerves Core Team

Oh, you just want terminal access to the device? Use NervesHub. Easiest way. You get a terminal on the web and full IEx. We know it works with way more than 10k devices.

If you must have direct networking to the device to poke it, then Wireguard is probably the good choice. It uses UDP and it’s own protocol but it is PKI-based so both parties actually hold a full public/private key pair and that’s how they shake hands. You could just pack these keys in during device provisioning if you want the easiest way. Or you could add some exchange mechanism to your cloud application to set them up as needed.

I want to explore adding wireguard to NervesHub but there is no timeline for it currently.

Absolutely easiest for manual intervention is by far just using a NervesHub service and enabling the remote iex shell.

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