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auto-mounting additional hard-drives added
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116
docs/luks2.md
116
docs/luks2.md
@ -27,7 +27,7 @@ lvcreate -L 32G vg -n root
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lvcreate -l 100%FREE vg -n home
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```
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and mkfs them:
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```
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```sh
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mkfs.ext4 /dev/vg/root
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mkfs.ext4 /dev/vg/home
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mkswap /dev/vg/swap
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@ -59,7 +59,7 @@ passwd
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## Edit /etc/mkinitcpio.conf to support encryption
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In `/etc/mkinitcpio.conf` edit the HOOKS to include these highlighted ones as well:
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```
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```/etc/mkinitcpio.conf
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HOOKS=(base __udev__ autodetect modconf kms keyboard keymap consolefont block __encrypt__ __lvm2__ filesystems fsck)
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```
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and rebuild initramfs:
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@ -68,13 +68,13 @@ mkinitcpio -P
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```
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## Create new user, download AUR helper, and install grub-improved-luks2-git
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```
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```sh
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useradd -m -G wheel alex
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passwd alex
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```
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Give him sudo permissions:
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in `/etc/sudoers` add:
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```
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```/etc/sudoers
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%wheel ALL=(ALL) ALL
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```
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Now install paru or equivalent AUR helper:
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@ -94,11 +94,11 @@ Get encrypted partition UUID into the /etc/default/grub via
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ls -l /dev/disk/by-uuid >> /etc/default/grub
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```
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and adjust two things in the file:
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```
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```/etc/default/grub
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GRUB_ENABLE_CRYPTODISK=y
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```
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and add to `GRUB_CMDLINE_LINUX`: (can have multiple, space-separated arguments so don't delete anything if it's there, just add.)
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```
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```/etc/default/grub
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GRUB_CMDLINE_LINUX="cryptdevice=UUID=device-UUID:cryptlvm"
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```
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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.
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@ -110,7 +110,8 @@ grub-mkconfig -o /boot/grub/grub.cfg
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## LUKS2 support
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Now create an additional file in `/boot/grub/grub-pre.cfg` with the follwing content:
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```
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```/boot/grub/grub-pre.cfg
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set crypto_uuid=device-UUID
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cryptomount -u $crypto_uuid
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set root=lvm/vg-root
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@ -121,25 +122,90 @@ normal
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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`)
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Now we can overwrite our previously generated grubx64.efi with a luks2 compatible one:
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```
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```sh
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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
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install -v /tmp/grubx64.efi /efi/EFI/GRUB/grubx64.efi
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```
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We should now be done. `exit`, `umount -R /mnt`, and `reboot` into GRUB to see whether everything worked.
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This still requires you to enter your passphrase twice but can be alleviated just as with the LUKS1 case:
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https://wiki.archlinux.org/title/Dm-crypt/Device_encryption#With_a_keyfile_embedded_in_the_initramfs
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## Only enter the password once
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Create a keyfile:
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```sh
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dd bs=512 count=4 if=/dev/random of=/crypto_keyfile.bin iflag=fullblock
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chmod 600 /crypto_keyfile.bin
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cryptsetup luksAddKey /dev/sda3 /crypto_keyfile.bin
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```
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Add this to the initramfs:
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```/etc/mkinitcpio.conf
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FILES=("/crypto_keyfile.bin")
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```
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And rebuld via
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```sh
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mkinitcpio -P
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```
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And add this file to the `GRUB_CMDLINE_LINUX` in `/etc/default/grub`:
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```/etc/default/grub
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GRUB_CMDLINE_LINE="... cryptkey=rootfs:/crypto_keyfile.bin"
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```
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And again rebuild GRUB
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```sh
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grub-install --target=x86_64-efi --efi-directory=/efi --bootloader-id=GRUB --recheck
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grub-mkconfig -o /boot/grub/grub.cfg
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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
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install -v /tmp/grubx64.efi /efi/EFI/GRUB/grubx64.efi
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```
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# Auto-decrypt additional encrypted hard-drives on bootup
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You can decrypt additional hard-drives automatically. For this we will use `/etc/crypttab` as well as `/etc/fstab`. This requires systemd to work.
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Create your additional encrypted hard-drives if not already existant:
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```sh
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cryptsetup luksFormat /dev/sdX
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cryptsetup open /dev/sdX YourDiskNameHere
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mkfs.ext4 /dev/mapper/YourDiskNameHere
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```
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If you do not wish to have to enter the additional password on boot-up you will have to create a keyfile like we did for our /dev/sda3 above.
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Of course this will lessen security as any additional hard-drives can also be decrypted if `/dev/sda3` has been decrypted or cracked.
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Systemd can autodetec keys in `/etc/cryptsetup-keys.d` if they have the pattern `YourDiskNameHere.key`. Create this directory if not already present:
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```sh
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mkdir /etc/cryptsetup-keys.d
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```
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Add an additional keyfile to your newly created encrypted hard-drive:
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```sh
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dd bs=512 count=4 if=/dev/random of=/etc/cryptsetup-keys.d/YourDiskNameHere.key iflag=fullblock
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chmod 600 /etc/cryptsetup-keys.d/YourDiskNameHere.key
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cryptsetup luksAddKey /dev/sdX /etc/cryptsetup-keys.d/YourDiskNameHere.key
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```
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Get the UUID of your new hard-drive via `ls -l /dev/disk/by-uuid` and edit `/etc/crypttab`:
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```/etc/crypttab
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YourDiskNameHere UUID=TheUUIDYouJustGot /etc/crypsetp-keys.d/YourDiskNameHere.key
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```
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If you use `/etc/cryptsetup-keys.d` and name your keys `YourDiskNameHere.key` you could leave out the third column as this is automatically tested for.
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after a `systemctl daemon-reload` you should now be able to start a service called `systemd-cryptsetup@YourDiskNameHere`.
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You can verify this via a `systemctl start systemd-cryptsetup@YourDiskNameHere`.
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You should not require to enter a password now.
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If everything works we can now modify the `/etc/fstab` for the automatic mounting. This is done like any unencrypted hard-drive by appending:
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```/etc/fstab
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/dev/mapper/YourDiskNameHere /YourMountPoint ext4 defaults 0 2
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```
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Your encrypted drive should now automount on boot-up without an additional password-prompt.
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# NOT TESTED, assumed to be the same as the LUKS1 case
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## Use swap for hibernations
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Add the `resume` hook in `/etc/mkinitcpio.conf`:
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```
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```/etc/mkinitcpio.conf
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HOOKS=(base udev autodetect modconf kms keyboard keymap consolefont block encrypt lvm2 __resume__ filesystems fsck)
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```
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and rebuild via `mkinitcpio -P`.
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Then: add to the `GRUB_CMDLINE_LINUX` in `/etc/default/grub`:
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```
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```/etc/default/grub
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GRUB_CMDLINE_LINUX="... resume=/dev/vg/swap"
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```
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and rebuild GRUB.
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@ -150,31 +216,3 @@ grub-mkconfig -o /boot/grub/grub.cfg
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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
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install -v /tmp/grubx64.efi /efi/EFI/GRUB/grubx64.efi
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```
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## Only enter the password once
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Create a keyfile:
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```sh
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dd bs=512 count=4 if=/dev/random of=/crypto_keyfile.bin iflag=fullblock
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chmod 600 /crypto_keyfile.bin
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cryptsetup luksAddKey /dev/sda3 /crypto_keyfile.bin
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```
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Add this to the initramfs:
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```
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FILES=("/crypto_keyfile.bin")
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```
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And rebuld via
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```sh
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mkinitcpio -P
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```
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And add this file to the `GRUB_CMDLINE_LINUX` in `/etc/default/grub`:
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```
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GRUB_CMDLINE_LINE="... cryptkey=rootfs:/crypto_keyfile.bin"
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```
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And again rebuild GRUB
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```sh
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grub-install --target=x86_64-efi --efi-directory=/efi --bootloader-id=GRUB --recheck
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grub-mkconfig -o /boot/grub/grub.cfg
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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
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install -v /tmp/grubx64.efi /efi/EFI/GRUB/grubx64.efi
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```
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