decrypt-root-with-usb: Updated Ubuntu patch.

This commit is contained in:
Ole Tange 2020-11-23 22:35:42 +01:00
parent f3277b3331
commit c345e1a816
2 changed files with 76 additions and 47 deletions

View file

@ -1,35 +1,28 @@
--- /usr/share/initramfs-tools/scripts/local-top/cryptroot.orig 2020-05-03 01:25:43.388812582 +0200
+++ /usr/share/initramfs-tools/scripts/local-top/cryptroot 2020-05-03 01:25:43.392812547 +0200
@@ -123,6 +123,23 @@
fi
fi
+ if [ -z "${CRYPTTAB_OPTION_keyscript+x}" ]; then
+ # Wait for USB to settle
+ /bin/sleep 3
+
+ # Test all devices
+ mkdir /mnt
+ echo -n "Searching for cryptkey.txt on available disks... "
+ local partition
+ for partition in `cat /proc/partitions |awk '{print $4}'|tail -n +3`; do
+ if mount /dev/$partition /mnt 2>/dev/null; then
+ cat /mnt/cryptkey.txt >> /tmp/cryptkeys.txt 2>/dev/null
+ umount /dev/$partition
+ fi
+ done
+ echo "done."
+ fi
+
get_crypt_type # set CRYPTTAB_TYPE to the type of crypt device
local count=0 maxtries="${CRYPTTAB_OPTION_tries:-3}" fstype vg rv
while [ $maxtries -le 0 ] || [ $count -lt $maxtries ]; do
@@ -130,8 +147,29 @@
--- /usr/share/initramfs-tools/scripts/local-top/cryptroot 2020-09-16 22:40:05.000000000 +0200
+++ cryptroot 2020-11-23 22:31:48.797985438 +0100
@@ -162,8 +162,46 @@
# unlock via keyfile
unlock_mapping "$CRYPTTAB_KEY"
else
- # unlock interactively or via keyscript
- run_keyscript "$CRYPTTAB_KEY" "$count" | unlock_mapping
+ if [ -z "${CRYPTTAB_OPTION_keyscript+x}" ]; then
+ # Wait for USB to settle
+ /bin/sleep 3
+
+ # Test all devices
+ mkdir /mnt
+ echo -n "Searching for cryptkey.txt on available disks... "
+ local partition
+ for partition in `cat /proc/partitions |awk '{print $4}'|tail -n +3`; do
+ if mount /dev/$partition /mnt 2>/dev/null; then
+ cat /mnt/cryptkey.txt >> /tmp/cryptkeys.txt 2>/dev/null
+ umount /dev/$partition
+ fi
+ done
+ echo "done."
+ fi
+
+ if [ -s /tmp/cryptkeys.txt ]; then
+ local keyfound
+ keyfound=0

View file

@ -31,8 +31,8 @@ esac
# wait_for_source()
# Wait for encrypted $CRYPTTAB_SOURCE for up to 180s. Set
# $CRYPTTAB_SOURCE to its normalized device name when it shows up;
# Wait for encrypted $CRYPTTAB_SOURCE . Set $CRYPTTAB_SOURCE
# to its normalized device name when it shows up;
# return 1 if timeout.
wait_for_source() {
wait_for_udev 10
@ -42,17 +42,27 @@ wait_for_source() {
return 0
fi
# The lines below has been taken from
# /usr/share/initramfs-tools/scripts/local's local_device_setup(),
# as suggested per https://launchpad.net/bugs/164044
# If the source device hasn't shown up yet, give it a little while
# to allow for asynchronous device discovery (e.g. USB).
#
# We also need to take into account RAID or other devices that may
# only be available on local-block stage. So, wait 5 seconds upfront,
# in local-top; if that fails, end execution relying on local-block
# invocations. Allow $ROOTDELAY/3 invocations with 1s sleep times (with
# a minimum of 30 invocations), and if after that we still fail, then it's
# really time to give-up. Variable $initrd_cnt tracks the re-invocations.
#
# Part of the lines below has been taken from initramfs-tools
# scripts/local's local_device_setup(), as suggested per
# https://launchpad.net/bugs/164044 .
local slumber=1
if [ ! -f "${CRYPTR_LOCAL_BLOCK}" ]; then # we are running on local-top
slumber=5
fi
cryptsetup_message "Waiting for encrypted source device $CRYPTTAB_SOURCE..."
# Default delay is 180s, cf. initramfs-tools(8)
local slumber="${ROOTDELAY:-180}"
while [ $slumber -gt 0 ]; do
sleep 1
@ -75,7 +85,23 @@ wait_for_source() {
# Set up a crypttab(5) mapping defined by $CRYPTTAB_NAME,
# $CRYPTTAB_SOURCE, $CRYPTTAB_KEY, $CRYPTTAB_OPTIONS.
setup_mapping() {
local dev
local dev initrd_cnt
# We control here the number of re-invocations of this script from
# local-block - the heuristic is $ROOTDELAY/3, with a minimum of 30.
# This number is somewhat dictated by mdadm, we want to run more times
# than that script, to allow decrypting volumes on top of arrays.
if [ -f "${CRYPTR_CNT_FILE}" ]; then
initrd_cnt=$(cat ${CRYPTR_CNT_FILE})
else
initrd_cnt=${ROOTDELAY:-90}
initrd_cnt=$((initrd_cnt/3))
if [ "${initrd_cnt}" -lt 30 ]; then
initrd_cnt=30
fi
echo ${initrd_cnt} > "${CRYPTR_CNT_FILE}"
fi
# The same target can be specified multiple times
# e.g. root and resume lvs-on-lvm-on-crypto
@ -86,17 +112,23 @@ setup_mapping() {
crypttab_parse_options --export --missing-path=fail || return 1
if ! wait_for_source; then
# we've given up
if [ -n "$panic" ]; then
panic "ALERT! encrypted source device $CRYPTTAB_SOURCE does not exist, can't unlock $CRYPTTAB_NAME."
else
# let the user fix matters if they can
echo " ALERT! encrypted source device $CRYPTTAB_SOURCE does not exist, can't unlock $CRYPTTAB_NAME."
echo " Check cryptopts=source= bootarg: cat /proc/cmdline"
echo " or missing modules, devices: cat /proc/modules; ls /dev"
panic "Dropping to a shell."
fi
return 1 # can't continue because environment is lost
if [ ${initrd_cnt} -le 0 ]; then
# we've given up
if [ -n "$panic" ]; then
panic "ALERT! encrypted source device $CRYPTTAB_SOURCE does not exist, can't unlock $CRYPTTAB_NAME."
else
# let the user fix matters if they can
echo " ALERT! encrypted source device $CRYPTTAB_SOURCE does not exist, can't unlock $CRYPTTAB_NAME."
echo " Check cryptopts=source= bootarg: cat /proc/cmdline"
echo " or missing modules, devices: cat /proc/modules; ls /dev"
panic "Dropping to a shell."
fi
return 1 # can't continue because environment is lost
else
initrd_cnt=$((initrd_cnt - 1))
echo ${initrd_cnt} > "${CRYPTR_CNT_FILE}"
return 0 # allow some attempts on local-block stage
fi
fi
# our `cryptroot-unlock` script searches for cryptsetup processes
@ -208,6 +240,10 @@ setup_mapping() {
done
cryptsetup_message "ERROR: $CRYPTTAB_NAME: maximum number of tries exceeded"
if [ -f "${CRYPTR_CNT_FILE}" ]; then
echo 0 > "${CRYPTR_CNT_FILE}"
fi
exit 1
}