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added potential solutions for hibernation keyfile

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Alexander Bocken 2023-06-29 10:07:41 +02:00
parent 377abbef49
commit 9a1a652e44
Signed by: Alexander
GPG Key ID: 1D237BE83F9B05E8
1 changed files with 57 additions and 6 deletions
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63
docs/luks2.md
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@ -97,11 +97,11 @@ and adjust two things in the file:
```
GRUB_ENABLE_CRYPTODISK=y
```
and
and add to `GRUB_CMDLINE_LINUX`: (can have multiple, space-separated arguments so don't delete anything if it's there, just add.)
```
GRUB_CMDLINE_LINUX="... cryptdevice=UUID=device-UUID:cryptlvm ..."
GRUB_CMDLINE_LINUX="cryptdevice=UUID=device-UUID:cryptlvm"
```
and recilace "device-UUID" with the uuid we got from the previous ls command. Of course remove all the trailing ls output.
and replace "device-UUID" with the uuid we got for `/dev/sda3` from the previous `ls` command. Of course remove all the trailing `ls` output.
```sh
grub-install --target=x86_64-efi --efi-directory=/efi --bootloader-id=GRUB --recheck
@ -111,14 +111,14 @@ grub-mkconfig -o /boot/grub/grub.cfg
## LUKS2 support
Now create an additional file in `/boot/grub/grub-pre.cfg` with the follwing content:
```
set crypto_uuid=UUID
set crypto_uuid=device-UUID
cryptomount -u $crypto_uuid
set root=lvm/vg-root
set prefix=($root)/boot/grub
insmod normal
normal
```
and replace UUID with the same UUID as before, (again, a `ls -l /dev/disk/by-uuid >> /boot/grub/grub-pre.cfg` can help here)
and replace device-UUID with the same device-UUID as before, (again, a `ls -l /dev/disk/by-uuid >> /boot/grub/grub-pre.cfg` can help here to get the UUID for `/dev/sda3`)
Now we can overwrite our previously generated grubx64.efi with a luks2 compatible one:
```
@ -126,4 +126,55 @@ grub-mkimage -p /boot/grub -O x86_64-efi -c /boot/grub/grub-pre.cfg -o /tmp/grub
install -v /tmp/grubx64.efi /efi/EFI/GRUB/grubx64.efi
```
We should now be done. `exit`, `umount -R /mnt`, and `reboot` into GRUB to see whether everything worked.
This still requires you to enter your passphrase twice but can be alleviated just as with the LUKS1 case: https://wiki.archlinux.org/title/Dm-crypt/Device_encryption#With_a_keyfile_embedded_in_the_initramfs
This still requires you to enter your passphrase twice but can be alleviated just as with the LUKS1 case:
https://wiki.archlinux.org/title/Dm-crypt/Device_encryption#With_a_keyfile_embedded_in_the_initramfs
# NOT TESTED, assumed to be the same as the LUKS1 case
## Use swap for hibernations
Add the `resume` hook in `/etc/mkinitcpio.conf`:
```
HOOKS=(base udev autodetect modconf kms keyboard keymap consolefont block encrypt lvm2 __resume__ filesystems fsck)
```
and rebuild via `mkinitcpio -P`.
Then: add to the `GRUB_CMDLINE_LINUX` in `/etc/default/grub`:
```
GRUB_CMDLINE_LINUX="... resume=/dev/vg/swap"
```
and rebuild GRUB.
```sh
grub-install --target=x86_64-efi --efi-directory=/efi --bootloader-id=GRUB --recheck
grub-mkconfig -o /boot/grub/grub.cfg
grub-mkimage -p /boot/grub -O x86_64-efi -c /boot/grub/grub-pre.cfg -o /tmp/grubx64.efi lvm luks2 part_gpt cryptodisk gcry_rijndael argon2 gcry_sha256 ext2
install -v /tmp/grubx64.efi /efi/EFI/GRUB/grubx64.efi
```
## Only enter the password once
Create a keyfile:
```sh
dd bs=512 count=4 if=/dev/random of=/crypto_keyfile.bin iflag=fullblock
chmod 600 /crypto_keyfile.bin
cryptsetup luksAddKey /dev/sda3 /crypto_keyfile.bin
```
Add this to the initramfs:
```
FILES=("/crypto_keyfile.bin")
```
And rebuld via
```sh
mkinitcpio -P
```
And add this file to the `GRUB_CMDLINE_LINUX` in `/etc/default/grub`:
```
GRUB_CMDLINE_LINE="... cryptkey=rootfs:/crypto_keyfile.bin"
```
And again rebuild GRUB
```sh
grub-install --target=x86_64-efi --efi-directory=/efi --bootloader-id=GRUB --recheck
grub-mkconfig -o /boot/grub/grub.cfg
grub-mkimage -p /boot/grub -O x86_64-efi -c /boot/grub/grub-pre.cfg -o /tmp/grubx64.efi lvm luks2 part_gpt cryptodisk gcry_rijndael argon2 gcry_sha256 ext2
install -v /tmp/grubx64.efi /efi/EFI/GRUB/grubx64.efi
```