this post was submitted on 10 Apr 2024
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42
Do I Need to Harden SSH over Tor? (infosec.pub)
submitted 7 months ago by anon2963@infosec.pub to c/selfhosted@lemmy.world
27 comments fedilink hide all child comments
 

cross-posted from: https://infosec.pub/post/10908807

TLDR:

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?

Full Post:

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. This is selfhosted on a home network.

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.

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[–] someonesmall@lemmy.ml 6 points 7 months ago (2 children)

30 character password + fail2ban after one failed attempt. Why not?

[–] AbidanYre@lemmy.world 3 points 7 months ago (1 children)

WCGW?

[–] someonesmall@lemmy.ml 0 points 7 months ago (1 children)

Tell me

[–] chaospatterns@lemmy.world 6 points 7 months ago (1 children)

Accidentally typo your password and get blocked. And if you're tunneling over tor, you've blocked 127.0.0.1 which means now nobody can login.

[–] someonesmall@lemmy.ml 1 points 7 months ago (1 children)

How would is a typo possible if one is using a password manager?

[–] baatliwala@lemmy.world 3 points 7 months ago (1 children)

Not OP but I've accidentally fingered another key a split second before hitting enter a few times. It's not implausible.

[–] someonesmall@lemmy.ml 1 points 7 months ago (1 children)

True, but I thought we are talking about security here...?

[–] wreckedcarzz@lemmy.world 1 points 7 months ago (1 children)

30 character

You've gotta pump those numbers, those are rookie numbers. (I have a vps that has several times that figure)

[–] someonesmall@lemmy.ml 1 points 7 months ago (1 children)

Did you read my message? After one failed attempt you will get banned.

[–] wreckedcarzz@lemmy.world 1 points 7 months ago

But

30 characters

:P