[RFC] Add support for systemd initcpio setups#25
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NOT WORKING ON SYSTEMD 253 AND ABOVE. NOT VERIFIED TO BE COMPATIBLE WITH EXISTING CRYPTTABS. In its current state, this crashes systemd-253 and above with the error message "Failed to start up manager" during early boot, which halts startup. Support for systemd also requires the pgp keyfile to be specified as `pgp-keyfile=...` as an option in the crypttab entry, instead of in the keyfile column. (Otherwise, systemd-decrypt will try to load it as an ordinary keyfile.) Documentation and migration tools will be updated once this gets closer to release quality.
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Hey, did you maybe forget to include the |
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Hi @fossdd, sorry about that, I've pushed it now. Thanks for flagging! |
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Significant rewrite/expansion of the scencrypt hook to allow it to work with systemd-based initcpios.
Instead of replacing the
systemd-cryptsetupflow, this method piggybacks on it by using a generator to add dependencies and overrides for systemd-cryptsetup disk targets, as follows:systemd-initramfs-gpg-init.serviceinitializes the GPG homedir inside the initramfs by importing all of the public keys which were packed into the initramfs.systemd-gpg-decrypt@.servicegets the passphrase or PIN fromsystemd-ask-passwordand passes it to gpg, which stores the keyfile at a known location (based on the key's filename).systemd-cryptsetup-pgp-keyfile@.servicecopies the key from the decrypted location to the/run/cryptsetup-keys.ddirectory where it is automatically picked up bysystemd-cryptsetupand used to decrypt the disk.Because it uses
systemd-ask-password, this means you can even use plymouth!Demo video running in a virtual machine with a real Yubikey passed through on USB: https://fuhry.com/b/initramfs-scencrypt-systemd-demo.webm
This does break backward compatibility with version 1.x, because there is no way to make
systemd-cryptsetupwork when the key-file column (column 3) of crypttab points to a file. It has to be set tononeand the pgp keyfile must be passed in an option instead. A migration script (aptly namedscencrypt-migrate) is included which mostly automates the process of modifying crypttab.