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oidc-based remote luks decryption – bad idea? (lemmy.world)

submitted 16 hours ago by dont@lemmy.world to c/selfhosted@lemmy.world

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Hey everyone, here's an idea, what do you think? (Please stop me...)

I have a few remote servers where disk encryption is only a moderately important measure; I definitely want to keep it but I'm also annoyed by having to ssh into it during the initrd-phase to provide a passkey on every reboot. What I would like is to get a notification with a link to my idp for some device flow, allowing me to authorize the server to obtain the secrets necessary for decryption.

As far as I can tell, this hasn't been done before, or have I missed something? A naive idea would be to have custom oidc-claims for the different servers where the value is the luks-passphrase. Feels like a bad idea, though. Any ideas on the details as to how? I obviously don't want to bloat my initrd-image, so a bash script using curl would be ideal.

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[–] thelittleblackbird@lemmy.world 2 points 15 hours ago (1 children)

Chech here, I think is a more sensible way of doing things https://www.recompile.se/mandos

[–] dont@lemmy.world 0 points 15 hours ago (1 children)

Interesting, do you happen to know how this "approval" works here, concretely?

[–] thelittleblackbird@lemmy.world 1 points 11 hours ago (1 children)

I am afraid I don't get the question.

What do you exactly mean?

[–] dont@lemmy.world 1 points 7 hours ago (1 children)

It wasn't clear to me at first glance how the mandos server gets the approval to supply the client with its desired key, but I figured it out in the meantime: that's done through the mandos-monitor tui. However, that doesn't quite fit my ux-expectations. Thanks for mentioning it, though. It's an interesting project I will keep in mind.

[–] thelittleblackbird@lemmy.world 2 points 5 hours ago

Ehmmmm I still don't grasp what you mean.

In any case, mandos has a possibility to do it automatically via rsa encryption, so you have the possibility of totally unattended restart.

Because the server is (ideally) in a different location, if one of yiur systems is stolen / compromised then you only delete / revoked the certificates ID and then that machine would not be able to decrypt its own luks system.

I never deployed this system on my own, but I know a few guys who did it

Regards