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In initramfs, do not prompt if keylocation is "file://"

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If the encryption key is stored in a file, the initramfs should not
prompt for the password. For example, this could be the case if the boot
partition is stored on removable media that is only present at boot time

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Garrett Fields <ghfields@gmail.com>
Reviewed-by: Richard Laager <rlaager@wiktel.com>
Reviewed-by: Kjeld Schouten <kjeld@schouten-lebbing.nl>
Signed-off-by: Sam Lunt <samuel.j.lunt@gmail.com>
Closes #9764
This commit is contained in:
sam-lunt 2019-12-26 12:55:20 -06:00 committed by Brian Behlendorf
parent 8cda5c5ce9
commit ad353e2147
2 changed files with 20 additions and 7 deletions
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7
contrib/dracut/90zfs/zfs-load-key.sh.in
View File

@ -37,10 +37,16 @@ fi
if [ "$(zpool list -H -o feature@encryption $(echo "${BOOTFS}" | awk -F\/ '{print $1}'))" = 'active' ]; then
# if the root dataset has encryption enabled
ENCRYPTIONROOT=$(zfs get -H -o value encryptionroot "${BOOTFS}")
# where the key is stored (in a file or loaded via prompt)
KEYLOCATION=$(${ZFS} get -H -o value keylocation "${ENCRYPTIONROOT}")
if ! [ "${ENCRYPTIONROOT}" = "-" ]; then
KEYSTATUS="$(zfs get -H -o value keystatus "${ENCRYPTIONROOT}")"
# continue only if the key needs to be loaded
[ "$KEYSTATUS" = "unavailable" ] || exit 0
# if key is stored in a file, do not prompt
if ! [ "${KEYLOCATION}" = "prompt" ]; then
zfs load-key "${ENCRYPTIONROOT}"
else
# decrypt them
TRY_COUNT=5
while [ $TRY_COUNT -gt 0 ]; do
@ -48,4 +54,5 @@ if [ "$(zpool list -H -o feature@encryption $(echo "${BOOTFS}" | awk -F\/ '{prin
TRY_COUNT=$((TRY_COUNT - 1))
done
fi
fi
fi

8
contrib/initramfs/scripts/zfs.in
View File

@ -411,6 +411,7 @@ decrypt_fs()
# Determine dataset that holds key for root dataset
ENCRYPTIONROOT="$(get_fs_value "${fs}" encryptionroot)"
KEYLOCATION="$(get_fs_value "${ENCRYPTIONROOT}" keylocation)"
# If root dataset is encrypted...
if ! [ "${ENCRYPTIONROOT}" = "-" ]; then
@ -418,8 +419,13 @@ decrypt_fs()
# Continue only if the key needs to be loaded
[ "$KEYSTATUS" = "unavailable" ] || return 0
TRY_COUNT=3
# If key is stored in a file, do not prompt
if ! [ "${KEYLOCATION}" = "prompt" ]; then
$ZFS load-key "${ENCRYPTIONROOT}"
# Prompt with plymouth, if active
if [ -e /bin/plymouth ] && /bin/plymouth --ping 2>/dev/null; then
elif [ -e /bin/plymouth ] && /bin/plymouth --ping 2>/dev/null; then
while [ $TRY_COUNT -gt 0 ]; do
plymouth ask-for-password --prompt "Encrypted ZFS password for ${ENCRYPTIONROOT}" | \
$ZFS load-key "${ENCRYPTIONROOT}" && break