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Skip loading already loaded key

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Don't ask for the password / try to load the key if the key for the
encryptionroot is already loaded.  The user might have loaded the key
manually or by other means before the scripts get called.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Tom Caputi <tcaputi@datto.com>
Reviewed-by: Richard Laager <rlaager@wiktel.com>
Signed-off-by: Witaut Bajaryn <vitaut.bayaryn@gmail.com>
Closes #9495
Closes #9529
This commit is contained in:
Witaut Bajaryn 2019-11-08 23:34:07 +01:00 committed by Tony Hutter
parent 1253fcc70a
commit 618206c0b9
4 changed files with 17 additions and 5 deletions
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4
contrib/dracut/90zfs/mount-zfs.sh.in
View File

@ -62,6 +62,9 @@ if import_pool "${ZFS_POOL}" ; then
# if the root dataset has encryption enabled
ENCRYPTIONROOT="$(zfs get -H -o value encryptionroot "${ZFS_DATASET}")"
if ! [ "${ENCRYPTIONROOT}" = "-" ]; then
KEYSTATUS="$(zfs get -H -o value keystatus "${ENCRYPTIONROOT}")"
# if the key needs to be loaded
if [ "$KEYSTATUS" = "unavailable" ]; then
# decrypt them
ask_for_password \
--tries 5 \
@ -69,6 +72,7 @@ if import_pool "${ZFS_POOL}" ; then
--cmd "zfs load-key '${ENCRYPTIONROOT}'"
fi
fi
fi
# Let us tell the initrd to run on shutdown.
# We have a shutdown hook to run
# because we imported the pool.

3
contrib/dracut/90zfs/zfs-load-key.sh.in
View File

@ -38,6 +38,9 @@ if [ "$(zpool list -H -o feature@encryption $(echo "${BOOTFS}" | awk -F\/ '{prin
# if the root dataset has encryption enabled
ENCRYPTIONROOT=$(zfs get -H -o value encryptionroot "${BOOTFS}")
if ! [ "${ENCRYPTIONROOT}" = "-" ]; then
KEYSTATUS="$(zfs get -H -o value keystatus "${ENCRYPTIONROOT}")"
# continue only if the key needs to be loaded
[ "$KEYSTATUS" = "unavailable" ] || exit 0
# decrypt them
TRY_COUNT=5
while [ $TRY_COUNT -gt 0 ]; do

3
contrib/initramfs/scripts/zfs.in
View File

@ -414,6 +414,9 @@ decrypt_fs()
# If root dataset is encrypted...
if ! [ "${ENCRYPTIONROOT}" = "-" ]; then
KEYSTATUS="$(${ZFS} get -H -o value keystatus "${ENCRYPTIONROOT}")"
# Continue only if the key needs to be loaded
[ "$KEYSTATUS" = "unavailable" ] || return 0
TRY_COUNT=3
# Prompt with plymouth, if active
if [ -e /bin/plymouth ] && /bin/plymouth --ping 2>/dev/null; then

2
etc/systemd/system-generators/zfs-mount-generator.in
View File

@ -182,6 +182,8 @@ process_line() {
keyloadcmd="@sbindir@/zfs load-key '${dataset}'"
elif [ "${p_keyloc}" = "prompt" ] ; then
keyloadcmd="sh -c 'set -eu;"\
"keystatus=\"\$\$(@sbindir@/zfs get -H -o value keystatus \"${dataset}\")\";"\
"[ \"\$\$keystatus\" = \"unavailable\" ] || exit 0;"\
"count=0;"\
"while [ \$\$count -lt 3 ];do"\
" systemd-ask-password --id=\"zfs:${dataset}\""\