Encrypted hard drive asking for password every time
I recently switched to Linux (Zorin OS) and I selected "use ZFS and encrypt" during installation. Now before I can log in it asks me "please unlock disk keystore-rpool" and I have to type in the encryption password it before I'm able to get to the login screen.
Is there a way to do this automatically like with Windows or MacOS? Zorin has biometric login which is nice but this defeats the purpose especially because the encryption password is long and tedious to type in.
Also might TPM have anything to do with this?
EDIT: Based on the responses I have to assume some of you guys live in windowless underground bunkers sealed off with concrete because door locks "aren't secure against battering rams". Normal people don't need perfect encryption they just want to add an extra hurdle or two for the crackhead who steals the PC. I assumed Linux had a system similar to what Windows or MacOS has been doing for a decade but I am apparently wrong.
Kinda curious as to the point of drive encryption if you just want it to automatically unlock on boot.
Encryption makes it more difficult to copy data from the drive. Windows and MacOS can manage to encrypt drives without requiring two different passwords, I mistakenly assumed Linux could too.
If you're having it automatically unlock the drive at boot, it kind of defeats the purpose. If someone steals your tower, they can boot it and copy the unencrypted contents since it automatically unlocks.
OP isn't asking for it to decrypt automatically. OP is asking for the entering the decryption password to also log you in. That way you only have to type the password once, instead of twice.
GDM has an autologin feature, OP should use it.
It depends on where the encryption data is stored. If the bootloader and bios/efi are locked down and the data to unlock is stored in an encrypted enclave or one is using a TPM (and not an external chip one that can be sniffed with a pi), that's a reasonable protection for the OS even if somebody gains physical access.
You could also store the password in the EFI, or on a USB stick etc. It doesn't help you much against longer-term physical access but it can help if somebody just grabs the drive. It's also useful to protect the drive if it's being disposed of as the crypto is tied to other hardware.
Even just encrypting the main OS with the keys in the boot/initrd has benefit, as ensuring that part is well-wiped makes asset disposal safe(r). Some motherboards have an on-board SDCard or USB slot which your can use for the boot partition. It means I don't have to take a drill to my drives before I dispose of them
I dont think you can. Can you read SSD storage while that is running? The drive needs to be decrypted using the TPM, and that should only work when its plugged in.
But if you have it set to unlock automatically…? It’s not like the drive is going to know it’s you booting it vs someone else if you’re not having to enter the password.
Windows and Mac can indeed encrypt drives without two passwords - as long as you don’t set a drive encryption password to be entered at BIOS load before the OS loads, which is what you’ve done.
The idea is to use TPM to store the keys - if you boot into a modified OS, TPM won't give you the same key so automatic unlock will fail. And protection against somebody just booting the original system and copying data off it is provided by the system login screen.
Voilà, automatic drive decryption with fingerprint unlock to log into the OS. That's what Windows does anyway.
I don't suppose you know of a tutorial to get this set up? Google turned up nothing.
Might be pretty complicated. https://www.reddit.com/r/zfs/comments/dimtjv// Your best bet is probably to enable autologin and use the same password for the encryption
I see. I don’t know that the usual drive encryption you set up during Linux install works with that, but there are BitLocker-like programs for Linux that might.
Although OPs scenario is if someone steals the tower, in which case it’s not a different TPM. Would only help if the drives were yanked, which honestly I’d probably do rather than try to take the whole tower.
If you boot the computer into the currently installed OS, you will be presented with a login screen and will have to enter the correct password to log in (kernel parameters are part of the checksums, so booting into single-user mode won't help you, that counts as a modified OS). If you boot a different OS, you won't get the key off the TPM.
MacOS does ask for a different password during setup, which you never have to use again unless you want to access the drive on a different PC.
How... How would they get the drive? Would n that need access to your computer? I imagine at that point they could turn it on first and copy your data that way, no?
Disk encryptions entire point is securing against physical access
No. With FDE, an adversary can't just trun it on and copy data unless there are some 0day on the login that allows exectuing arbitrary codes.
Or you use TPM, which you can get the key out of