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.
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