Passphrase for LUKS encrypted partitions asked twice during boot

General system Kernel & Hardware
1

During boot process, I am asked a second time to enter a LUKS passphrase for a partition which I added later on in crypttab and fstab (later means after the first complete installation process).

Following are fragments from crypttab:

luks-0b2e5609-b174-45aa-875c-727ae046ea13 UUID=0b2e5609-b174-45aa-875c-727ae046ea13     /crypto_keyfile.bin luks
luks-a9001606-80a3-47d8-bc48-e2a79a3a95be UUID=a9001606-80a3-47d8-bc48-e2a79a3a95be     /crypto_keyfile.bin luks
luks-03e0680d-6510-4bda-a1c2-698e71e0448a UUID=03e0680d-6510-4bda-a1c2-698e71e0448a     /crypto_keyfile.bin luks
luks-ed616353-6a2e-4003-93fe-13b7e931c04d UUID=ed616353-6a2e-4003-93fe-13b7e931c04d     /crypto_keyfile.bin luks

and fstab:

UUID=F577-4FE2                                          /boot/efi    vfat    noatime             0 2
/dev/mapper/luks-0b2e5609-b174-45aa-875c-727ae046ea13   swap         swap    defaults            0 0
dev/mapper/luks-a9001606-80a3-47d8-bc48-e2a79a3a95be   /            ext4    noatime             0 1
/dev/mapper/luks-03e0680d-6510-4bda-a1c2-698e71e0448a   /home        ext4    noatime             0 2
/dev/mapper/luks-ed616353-6a2e-4003-93fe-13b7e931c04d   /software    ext4    noatime             0 2
tmpfs                                                   /tmp         tmpfs   noatime,mode=1777   0 0

Entering before boot the passphrase, goes all the way up until mounting /software. The passphrase is asked again. I have added this partition later on, after the installation process in which I defined all encrypted partitions manually (using Calamares). I decided to change the filesystem type for /software thus I needed to set it up again from the scratch to be an ecrypted partition.

Why is the passphrase asked again even if it is the same? Do I need to do something in the initramfs?

2

It makes no difference if the password is different or the same.

There is a keyfile in the root that is used to unlock all the partitions except the root itself.

You need to add that keyfile into a slot on the luks partition you created.

3

If there is a keyfile in the root that is used to unlock all other partitions, why does it stumble on one partition? I.e. why does it ask for a second time a passphrase to open and mount the partition Software?

Does each and every encrypted partition need its key “added” onto itself?

4

A keyfile is like a password, it will only unlock partitions you allow it to.

Yes. When the installer creates partitions, it adds the keyfile to it. When you create your own, you need to do that.

5

Once had this problem. The arch wiki may help:

[https://wiki.archlinux.org/title/dm-crypt/Device_encryption#With_a_keyfile_embedded_in_the_initramfs]

Welcome to the Endavour forums :slight_smile:

1 Like
6

I did exactly this:

cryptsetup luksAddKey /dev/mapper/luks-ed616353-6a2e-4003-93fe-13b7e931c04d

and “added” (?) the same passphrae. I am still asked for the passphrase, for this very partition. What am I doing wrong? Or, what is next to check?

7

Alright, it worked via :

cryptsetup luksAddKey /dev/nvme0n1p9 /crypto_keyfile.bin

Thank you @dalto.

ps- I am marking this as the solution just because it containts a concrete command. The answer came, of course from @dalto’s first reply in this thread.

8

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