** Description changed:
- It is not possible to unlock multiple devices in the initramfs phase,
- for example when having a zfs mirror as the root filesystem. This makes
- the package unusable in that case.
+ [Impact]
+ clevis can be used to automatically unlock LUKS-encrypted devices during boot
by asking a remote server for the key (sort of). It does so by monitoring for
the processes that send up the interactive prompts "Please unlock disk xxx:"
and then sends a key to that process through a fifo that the process has opened.
+ The bug that existed in clevis versions prior to version 17 forgot to clear a
saved PID-variable (used to store the PID of the process that creates the
prompt for the user), so when the PID of the first process has been found it
won't look for more processes of this type. This means it can only unlock one
device. If you have for example some sort of RAID root filesystem with multiple
disks (or a ZFS mirror as me) then clevis does not work at all.
- This has been fixed in upstream (latchset/clevis, version 17, commit
- 0abdfbc7812c8ef588ee22fd35941b5e831fdce7)
+ [Test Plan]
+ - Setup a tang server on a different host:
+ # sudo apt install tang
+ # sudo systemctl enable tangd.socket --now
+ # reboot
+
+ - Setup two LUKS-disks that shall be decrypted during early boot (append
+ option initramfs to them in /etc/crypttab)
+
+ - Setup clevis:
+ # sudo apt install clevis
+ # sudo apt install clevis-luks
+ # sudo apt install clevis-initramfs
+
+ - Bind the encrypted disks to the tang server:
+ # sudo clevis luks bind -d /dev/<disk1> tang '{"url": "http://<tang-server>"}'
+ # sudo clevis luks bind -d /dev/<disk2> tang '{"url": "http://<tang-server>"}'
+
+ - Regenerate initramfs
+ # sudo update-initramfs -u -k 'all'
+
+ - Reboot
+ # reboot
+
+ After the reboot you will be stuck at "Please unlock disk xxx:" until
+ you enter the passphrase manually.
+
+ If you perform all the steps using only one disk it will work.
+
+ [Where problems could occur]
+ If something is wrong with the patch it will show up when clevis is unlocking
a LUKS-encrypted disk during initramfs.
+
+ [Other Info]
+ This has been fixed in upstream (latchset/clevis, version 17, commit
0abdfbc7812c8ef588ee22fd35941b5e831fdce7)
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https://bugs.launchpad.net/bugs/1948598
Title:
Can't unlock multiple devices in initramfs
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