If I use SSH as a Tor hidden service and do not share the public hostname of that service, do I need any more hardening?

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I am planning to setup a clearnet service on a server where my normal “in bound” management will be over SSH tunneled through Wireguard. I also want “out of bound” management in case the incoming ports I am using get blocked and I cannot access my Wireguard tunnel.

I was thinking that I could have an SSH bastion host as a virtual machine, which will expose SSH as a a hidden service. I would SSH into this VM over Tor and then proxy SSH into the host OS from there. As I would only be using this rarely as a backup connection, I do not care about speed or convenience of connecting to it, only that it is always available and secure. Also, I would treat the public hostname like any other secret, as only I need access to it.

Other than setting up secure configs for SSH and Tor themselves, is it worth doing other hardening like running Wireguard over Tor? I know that extra layers of security can’t hurt, but I want this backup connection to be as reliable as possible so I want to avoid unneeded complexity.

  • @tux
    12 months ago

    Look up hardening SSH and just use the same options for Tor as you would for the regular internet.

    Two things to keep in mind:

    1. Tor is TCP only so you can’t use mosh which uses UDP.
    2. Only allow connection through ssh keys without a password. I know you’ll probably do that anyway, but it’s good to point that out.