this post was submitted on 21 Jul 2024
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Separate persistent data and operating system partitions, ensure that every local network has small pxe servers, vpned (wireguard, etc) to a cdn with your base OS deployment images, that validate images based on CA and checksum before delivering, and give every user the ability to pxe boot and redeploy the non-data partition.
Bitlocker keys for the OS partition are irrelevant because nothing of value is stored on the OS partition, and keys for the data partition can be stored and passed via AD after the redeploy. If someone somehow deploys an image that isn't ours, it won't have keys to the data partition because it won't have a trust relationship with AD.
(This is actually what I do at work)
Sounds good, but can you trust an OS partition not to store things in %programdata% etc that should be encrypted?
With enough ~autism~ in your overlay configs, sure, but in my environment tat leakage is still encrypted. It's far simpler to just accept leakage and encrypt the OS partition with a key that's never stored anywhere. If it gets lost, you rebuild the system from pxe. (Which is fine, because it only takes about 20 minutes and no data we care about exists there) If it's working correctly, the OS partition is still encrypted and protects any inadvertent data leakage from offline attacks.