302 lines
9.8 KiB
Bash
302 lines
9.8 KiB
Bash
#!/bin/sh
|
|
|
|
# Search for cryptkey.txt
|
|
|
|
PREREQ="cryptroot-prepare"
|
|
|
|
#
|
|
# Standard initramfs preamble
|
|
#
|
|
prereqs()
|
|
{
|
|
# Make sure that cryptroot is run last in local-top
|
|
local req
|
|
for req in "${0%/*}"/*; do
|
|
script="${req##*/}"
|
|
if [ "$script" != "${0##*/}" ]; then
|
|
printf '%s\n' "$script"
|
|
fi
|
|
done
|
|
}
|
|
|
|
case $1 in
|
|
prereqs)
|
|
prereqs
|
|
exit 0
|
|
;;
|
|
esac
|
|
|
|
. /scripts/functions
|
|
|
|
[ -f /lib/cryptsetup/functions ] || return 0
|
|
. /lib/cryptsetup/functions
|
|
|
|
|
|
# wait_for_source()
|
|
# 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
|
|
|
|
if crypttab_resolve_source; then
|
|
# the device is here already, no need to loop
|
|
return 0
|
|
fi
|
|
|
|
# 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..."
|
|
|
|
while [ $slumber -gt 0 ]; do
|
|
sleep 1
|
|
|
|
if [ -x /scripts/local-block/lvm2 ]; then
|
|
# activate any VG that might hold $CRYPTTAB_SOURCE
|
|
/scripts/local-block/lvm2 "$CRYPTTAB_SOURCE"
|
|
fi
|
|
|
|
if crypttab_resolve_source; then
|
|
wait_for_udev 10
|
|
return 0
|
|
fi
|
|
|
|
slumber=$(( $slumber - 1 ))
|
|
done
|
|
return 1
|
|
}
|
|
|
|
# setup_mapping()
|
|
# Set up a crypttab(5) mapping defined by $CRYPTTAB_NAME,
|
|
# $CRYPTTAB_SOURCE, $CRYPTTAB_KEY, $CRYPTTAB_OPTIONS.
|
|
setup_mapping() {
|
|
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
|
|
if dm_blkdevname "$CRYPTTAB_NAME" >/dev/null; then
|
|
return 0
|
|
fi
|
|
|
|
crypttab_parse_options --export --missing-path=fail || return 1
|
|
|
|
if ! wait_for_source; then
|
|
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
|
|
# with a given CRYPTTAB_NAME it their environment
|
|
export CRYPTTAB_NAME
|
|
|
|
if [ -z "${CRYPTTAB_OPTION_keyscript+x}" ]; then
|
|
# no keyscript: interactive unlocking, or key file
|
|
|
|
if [ "${CRYPTTAB_KEY#/FIXME-initramfs-rootmnt/}" != "$CRYPTTAB_KEY" ]; then
|
|
# skip the mapping for now if the root FS is not mounted yet
|
|
sed -rn 's/^\s*[^#[:blank:]]\S*\s+(\S+)\s.*/\1/p' /proc/mounts | grep -Fxq -- "$rootmnt" || return 1
|
|
# substitute the "/FIXME-initramfs-rootmnt/" prefix by the real root FS mountpoint otherwise
|
|
CRYPTTAB_KEY="$rootmnt/${CRYPTTAB_KEY#/FIXME-initramfs-rootmnt/}"
|
|
fi
|
|
|
|
if [ "$CRYPTTAB_KEY" != "none" ]; then
|
|
if [ ! -e "$CRYPTTAB_KEY" ]; then
|
|
cryptsetup_message "ERROR: Skipping target $CRYPTTAB_NAME: non-existing key file $CRYPTTAB_KEY"
|
|
return 1
|
|
fi
|
|
# try only once if we have a key file
|
|
CRYPTTAB_OPTION_tries=1
|
|
fi
|
|
fi
|
|
|
|
get_crypt_type # set CRYPTTAB_TYPE to the type of crypt device
|
|
local count=0 maxtries="${CRYPTTAB_OPTION_tries:-3}" fstype vg rv
|
|
while [ $maxtries -le 0 ] || [ $count -lt $maxtries ]; do
|
|
if [ -z "${CRYPTTAB_OPTION_keyscript+x}" ] && [ "$CRYPTTAB_KEY" != "none" ]; then
|
|
# unlock via keyfile
|
|
unlock_mapping "$CRYPTTAB_KEY"
|
|
else
|
|
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
|
|
echo -n " $partition"
|
|
if mount -oro /dev/"$partition" /mnt 2>/dev/null; then
|
|
echo -n "(mounted)"
|
|
cat /mnt/cryptkey.txt >> /tmp/cryptkeys.txt 2>/dev/null
|
|
umount /dev/"$partition"
|
|
fi
|
|
done
|
|
echo "done."
|
|
fi
|
|
|
|
if [ -s /tmp/cryptkeys.txt ]; then
|
|
local keyfound
|
|
keyfound=0
|
|
echo Trying keys from cryptkey.txt
|
|
for key in `cat /tmp/cryptkeys.txt`; do
|
|
if echo -n "$key" | unlock_mapping; then
|
|
# Found the key
|
|
echo Key found in cryptkey.txt
|
|
keyfound=1
|
|
key=""
|
|
fi
|
|
done
|
|
# Remove traces of the key
|
|
rm /tmp/cryptkeys.txt
|
|
unset key
|
|
if [ "$keyfound" = "0" ]; then
|
|
# Fall back to manual entry
|
|
run_keyscript "$CRYPTTAB_KEY" "$count" | unlock_mapping
|
|
fi
|
|
else
|
|
# unlock interactively or via keyscript
|
|
run_keyscript "$CRYPTTAB_KEY" "$count" | unlock_mapping
|
|
fi
|
|
fi
|
|
rv=$?
|
|
count=$(( $count + 1 ))
|
|
|
|
if [ $rv -ne 0 ]; then
|
|
cryptsetup_message "ERROR: $CRYPTTAB_NAME: cryptsetup failed, bad password or options?"
|
|
sleep 1
|
|
continue
|
|
elif ! dev="$(dm_blkdevname "$CRYPTTAB_NAME")"; then
|
|
cryptsetup_message "ERROR: $CRYPTTAB_NAME: unknown error setting up device mapping"
|
|
return 1
|
|
fi
|
|
|
|
if ! fstype="$(get_fstype "$dev")" || [ "$fstype" = "unknown" ]; then
|
|
if [ "$CRYPTTAB_TYPE" != "luks" ]; then
|
|
# bad password for plain dm-crypt device? or mkfs not run yet?
|
|
cryptsetup_message "ERROR: $CRYPTTAB_NAME: unknown fstype, bad password or options?"
|
|
wait_for_udev 10
|
|
/sbin/cryptsetup remove -- "$CRYPTTAB_NAME"
|
|
sleep 1
|
|
continue
|
|
fi
|
|
elif [ "$fstype" = lvm2 ]; then
|
|
if [ ! -x /sbin/lvm ]; then
|
|
cryptsetup_message "WARNING: $CRYPTTAB_NAME: lvm is not available"
|
|
return 1
|
|
elif vg="$(lvm pvs --noheadings -o vg_name --config 'log{prefix=""}' -- "$dev")"; then
|
|
# activate the VG held by the PV we just unlocked
|
|
lvm lvchange -a y --sysinit --ignoreskippedcluster -- "$vg"
|
|
fi
|
|
fi
|
|
|
|
cryptsetup_message "$CRYPTTAB_NAME: set up successfully"
|
|
wait_for_udev 10
|
|
return 0
|
|
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
|
|
}
|
|
|
|
|
|
#######################################################################
|
|
# Begin real processing
|
|
|
|
mkdir -p /cryptroot # might not exist yet if the main system has no crypttab(5)
|
|
|
|
# Do we have any kernel boot arguments?
|
|
if ! grep -qE '^(.*\s)?cryptopts=' /proc/cmdline; then
|
|
# ensure $TABFILE exists and has a mtime greater than the boot time
|
|
# (existing $TABFILE is preserved)
|
|
touch -- "$TABFILE"
|
|
else
|
|
# let the read builtin unescape the '\' as GRUB substitutes '\' by '\\' in the cmdline
|
|
tr ' ' '\n' </proc/cmdline | sed -n 's/^cryptopts=//p' | while IFS= read cryptopts; do
|
|
# skip empty values (which can be used to disable the initramfs
|
|
# scripts for a particular boot, cf. #873840)
|
|
[ -n "$cryptopts" ] || continue
|
|
unset -v target source key options
|
|
|
|
IFS=","
|
|
for x in $cryptopts; do
|
|
case "$x" in
|
|
target=*) target="${x#target=}";;
|
|
source=*) source="${x#source=}";;
|
|
key=*) key="${x#key=}";;
|
|
*) options="${options+$options,}$x";;
|
|
esac
|
|
done
|
|
|
|
if [ -z "${source:+x}" ]; then
|
|
cryptsetup_message "ERROR: Missing source= value in kernel parameter cryptopts=$cryptopts"
|
|
else
|
|
# preserve mangling
|
|
printf '%s %s %s %s\n' "${target:-cryptroot}" "$source" "${key:-none}" "${options-}"
|
|
fi
|
|
done >"$TABFILE"
|
|
fi
|
|
|
|
# Do we have any settings from the $TABFILE?
|
|
if [ -s "$TABFILE" ]; then
|
|
# Create locking directory before invoking cryptsetup(8) to avoid warnings
|
|
mkdir -pm0700 /run/cryptsetup
|
|
modprobe -q dm_crypt
|
|
|
|
crypttab_foreach_entry setup_mapping
|
|
fi
|
|
|
|
exit 0
|