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Suikan 2021-07-08 21:19:16 +09:00
parent be32e5e387
commit 40264ce02f
3 changed files with 43 additions and 34 deletions
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14
script/lib/chrooted_job_ubuntu.sh
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@ -9,26 +9,30 @@ function chrooted_job() {
# Mount the rest of partitions by target /etc/fstab
mount -a
# Set up the kernel hook of encryption
# Prepare the crypto tool in the install target
echo "...Installing cryptsetup-initramfs package."
apt -qq install -y cryptsetup-initramfs
# Prepare a key file to embed in to the ramfs.
# Prepare a new key file to embed in to the ramfs.
# This new file contains a new key to open the LUKS volume.
# The new key is 4096byte length binary value.
# Because this key is sotred as "cleartext", in the target file sysmte,
# only root is allowed to access this key file.
echo "...Prepairing key file."
mkdir /etc/luks
dd if=/dev/urandom of=/etc/luks/boot_os.keyfile bs=4096 count=1 status=none
chmod u=rx,go-rwx /etc/luks
chmod u=r,go-rwx /etc/luks/boot_os.keyfile
# Add a key to the key file. Use the passphrase in the environment variable.
# Add the new key to the LUKS 2nd key slot. The passphrase is required to modify the LUKS keyslot.
echo "...Adding a key to the key file."
printf %s "${PASSPHRASE}" | cryptsetup luksAddKey --iter-time "${ITERTIME}" -d - "${DEV}${CRYPTPARTITION}" /etc/luks/boot_os.keyfile
# Add the LUKS volume information to /etc/crypttab to decrypt by kernel.
# Register the LUKS voluem to /etc/crypttab to tell "This volume is encrypted"
echo "...Adding LUKS volume info to /etc/crypttab."
echo "${CRYPTPARTNAME} UUID=$(blkid -s UUID -o value ${DEV}${CRYPTPARTITION}) /etc/luks/boot_os.keyfile luks,discard" >> /etc/crypttab
# Putting key file into the ramfs initial image
# Add key file to the list of the intems in initfsram.
echo "...Registering key file to the ramfs"
echo "KEYFILE_PATTERN=/etc/luks/*.keyfile" >> /etc/cryptsetup-initramfs/conf-hook
echo "UMASK=0077" >> /etc/initramfs-tools/initramfs.conf