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How secure is my local backup drive with sshfs? (discuss.tchncs.de)

submitted 1 day ago* (last edited 15 hours ago) by 712@discuss.tchncs.de to c/selfhosted@lemmy.world

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Hello everyone.

I have been interested in starting to self-host, and I have just been able to set up the first useful thing for myself (apart from a PiHole that I have running).

Since I am very afraid of making security mistakes, I would like to get feedback from you if my setup is secure or not.

The simple use case: I want to be able to back up files from my main computer to a hard disk, without having the hard disk attached to my main computer.

The setup:

A Raspberry Pi 4 running Raspberry Pi OS Lite (64-bit).
The Raspberry Pi can only be accessed via ed25519 key.
I configured a firewall on the Raspberry Pi with ufw to allow only traffic from the local subnet.
I then use sshfs to mount the hard disk connected with the Raspberry Pi to my main computer.
I plan to use rsync to back up my files.

Now I need your help: how secure is this setup? Did I make any major mistake? Is there something I could do better?

I'd be happy to get some feedback... 🙂

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[–] irmadlad@lemmy.world 5 points 1 day ago* (last edited 1 day ago) (1 children)

You should be good with caveats:

Permissions on: ~/.ssh: chmod 700 ~/.ssh
Permissions on private keys: chmod 600 ~/.ssh/id_rsa or id_ed25519, etc.
Permissions on public keys: chmod 644 ~/.ssh/id_rsa.pub

You can check with: ls -la ~/.ssh/

[–] needanke@feddit.org 3 points 1 day ago

And of course encrypting the drive the files are on.