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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).

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LUKS decrypt at boot over SSH? (lemmy.world)

submitted 3 days ago by clif@lemmy.world to c/linux@lemmy.ml

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I've done a little research but curious about first hand experience.

I've got a little home server that is full disk encrypted with LUKS (+LVM, of course). It's headless (no display, no keyboard, etc) and just lives attached to the back of my desk, out of the way.

If it gets rebooted due to a power outage, I can plug in a keyboard, wait long enough for it to get to the LUKS password prompt, enter password, hit enter, and assume it worked if I see the disk activity light blinking. Worst case scenario, I can move it to a monitor and plug it in to get display too.

Because lazy, I'd prefer to be able to enter the decrypt password remotely. "Dropbear" seems to be a common suggestion but I haven't tried it yet.

So, asking for your experience or recommendations.

I'll start. Recommendation #1 - get a UPS : D ... But besides that.

Addendum: either way, I currently need to be home to do this because I access it remotely via tailscale along with my desktop. Since both are full disk encrypted, neither will boot to the point of starting tailscale without intervention. But, I might repurpose a nonencrypted RPi with SSHd to act as a "auto restarts with tailscale so I can SSH to it, then SSH to server to enter the LUKS password" jump point.

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[–] bjoern_tantau@swg-empire.de 3 points 2 days ago (1 children)

I use dropbear in initramfs on my Debian server. Works great.

At home I have a cheap networked KVM because I also sometimes have hardware problems preventing a boot. Works really well. Cost 100 € and uses open source software. It's called GL.iNet KVM.

[–] clif@lemmy.world 2 points 2 days ago

Good to hear. This will be going on a Debian server too.

I just set up tailscale on the RPi that controls my printer so I've got a jump host on the LAN now... Just need to make time to setup dropbear (and keys) on the server.