LUKS (or similar) encryption

FWIW you can make LUKS get its keys off a storage device that you then remove (I used to do this with a small sd card).

Me? No. I was hoping for LUKS on generic x86 images.

yeah nothing on x86 from me. There we will need to use fscrypt unless we add some smartness to grub. I’m afraid

Hey, I was wondering if there were any new on LUKS encryption? In regards to amd64 in particular. @ogra, @ondra, is there still active work being done on this?

hmm, is this project related to packaging cryptsetup? like:, or in go?

@cratliff the implementation we did was for a customer and built around specific features of the hardware (storing a key in HW, builtin encryption features), it is not generic (and this is really hard to do since proper security requires a safe way to store the key) …

i was pondering to add a simple “manually input the key”, but thats really not helpful in IoT or robotics where you want devices to boot non-interactively … it is still on my TODO to upstream the generic parts of the code itself into the ubuntu-core initrd … though you would have to come up with a working way to store the key in your HW in a safe manner.

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That’s pretty much what I expected, implementations that aren’t interactive would be HW specific. I was hoping there would be a something like the generic version you mentioned so I might not have to implement much more than the key storage. Do you have an estimate on when that might be upstreamed? Or is there anyway I could help make a generic solution?

@cratliff there is one more complication when it comes to amd64. When you use full disk encryption approach, we would need to teach grub all the tricks, otherwise it cannot see kernel snap to boot from Another approach here would be to use u-boot on amd64 :slight_smile: or instead of using luks we would need to use fscrypt or something similar. It’s something I have plan to experiment with, once time will allow. So hopefully soon, but unfortunately not too soon…

@cratliff sorry I missed your ping on irc, I’m usually available during UK time so feel free to ping me there

A post was split to a new topic: How to zip and encrypt a file

Has any progress ever been made on this? It’s sort of difficult to use snaps for commercial applications as someone can just pull out the SD card and steal all of the data. It would be nice if there was some sort of a pathway to encrypting the entire drive, maybe using something like this to store the key:

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Heyo, pinging because I’m now interested in this topic as well. What’s the tea? @ogra or @popey did you ever make any progress on this?

as stated above i worked on one individual implementaion for one specific customer where there was a popwr key storage on the board and the customer also used an individual kernel snap that could handle signed uboot FIT images … AFAIK with Ubuntu Core 20 the snapd and foundations teams worked on a more generalized variant that will make enabling it for brand store customers easier and should basically also work by default on UEFI x86 systems.

(note that full disk encryption kind of went hand in hand with secure boot in our setup so i cant really tell if you could use only one or only the other (and i doubt it would make sense security wise))

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Gotcha. I don’t suppose you have any further reading on the topic, do you? I found this whitepaper that I intend to read, but most of my surface-level googling has revealed people from 2016 saying its infeasible.

nope, i moved teams since i did that implementation originally and didnt closely follow what was actually implemented in UC20

(but you made this topic bubble up to the top again, so perhaps someone from the snapd or foundations team can chime in)

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We are actively working on making full disk encryption work with non-amd64 platforms on UC20, but that work is scheduled for a bit later this year, more details to follow…

In the meantime for anyone interested in playing with FDE on amd64, provided you have a device that uses UEFI and has secure boot enabled and turned on with an unprovisioned TPM2.0 device, you can flash the UC20 beta images onto the device and get full disk encryption by default. See more details here: UC20 beta1 released


Thanks for the info. Might you have any learning resources for me? I’m pretty interested in this and learning how it works.

Which parts? Do you mean documentation on how Ubuntu Core 20 encryption works on amd64?

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I read the beta post already, but yes, if you’ve got anything else, that’d be swell.

We don’t have anything more specific written now, but we hope to have some more documentation on FDE out soonish before UC20 1.0 release is done