tangetools/decrypt-root-with-usb/debian-2018/usr/share/initramfs-tools/scripts/local-top/cryptroot

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#!/bin/sh
PREREQ="cryptroot-prepare"
#
# Standard initramfs preamble
#
prereqs()
{
# Make sure that cryptroot is run last in local-top
for req in $(dirname $0)/*; do
script=${req##*/}
if [ $script != cryptroot ]; then
echo $script
fi
done
}
case $1 in
prereqs)
prereqs
exit 0
;;
esac
# source for log_*_msg() functions, see LP: #272301
. /scripts/functions
#
# Helper functions
#
message()
{
if [ -x /bin/plymouth ] && plymouth --ping; then
plymouth message --text="$@"
else
echo "$@" >&2
fi
return 0
}
udev_settle()
{
# Wait for udev to be ready, see https://launchpad.net/bugs/85640
if command -v udevadm >/dev/null 2>&1; then
udevadm settle --timeout=30
elif command -v udevsettle >/dev/null 2>&1; then
udevsettle --timeout=30
fi
return 0
}
parse_options()
{
local cryptopts
cryptopts="$1"
if [ -z "$cryptopts" ]; then
return 1
fi
# Defaults
cryptcipher=aes-cbc-essiv:sha256
cryptsize=256
crypthash=ripemd160
crypttarget=cryptroot
cryptsource=""
cryptheader=""
cryptlvm=""
cryptkeyscript=""
cryptkey="" # This is only used as an argument to an eventual keyscript
cryptkeyslot=""
crypttries=3
crypttcrypt=""
cryptveracrypt=""
cryptrootdev=""
cryptdiscard=""
CRYPTTAB_OPTIONS=""
local IFS=" ,"
for x in $cryptopts; do
case $x in
hash=*)
crypthash=${x#hash=}
;;
size=*)
cryptsize=${x#size=}
;;
cipher=*)
cryptcipher=${x#cipher=}
;;
target=*)
crypttarget=${x#target=}
export CRYPTTAB_NAME="$crypttarget"
;;
source=*)
cryptsource=${x#source=}
if [ ${cryptsource#UUID=} != $cryptsource ]; then
cryptsource="/dev/disk/by-uuid/${cryptsource#UUID=}"
elif [ ${cryptsource#LABEL=} != $cryptsource ]; then
cryptsource="/dev/disk/by-label/$(printf '%s' "${cryptsource#LABEL=}" | sed 's,/,\\x2f,g')"
fi
export CRYPTTAB_SOURCE="$cryptsource"
;;
header=*)
cryptheader=${x#header=}
if [ ! -e "$cryptheader" ] && [ -e "/conf/conf.d/cryptheader/$cryptheader" ]; then
cryptheader="/conf/conf.d/cryptheader/$cryptheader"
fi
export CRYPTTAB_HEADER="$cryptheader"
;;
lvm=*)
cryptlvm=${x#lvm=}
;;
keyscript=*)
cryptkeyscript=${x#keyscript=}
;;
key=*)
if [ "${x#key=}" != "none" ]; then
cryptkey=${x#key=}
fi
export CRYPTTAB_KEY="$cryptkey"
;;
keyslot=*)
cryptkeyslot=${x#keyslot=}
;;
tries=*)
crypttries="${x#tries=}"
case "$crypttries" in
*[![:digit:].]*)
crypttries=3
;;
esac
;;
tcrypt)
crypttcrypt="yes"
;;
veracrypt)
cryptveracrypt="--veracrypt"
;;
rootdev)
cryptrootdev="yes"
;;
discard)
cryptdiscard="yes"
;;
esac
PARAM="${x%=*}"
if [ "$PARAM" = "$x" ]; then
VALUE="yes"
else
VALUE="${x#*=}"
fi
CRYPTTAB_OPTIONS="$CRYPTTAB_OPTIONS $PARAM"
eval export CRYPTTAB_OPTION_$PARAM="\"$VALUE\""
done
export CRYPTTAB_OPTIONS
if [ -z "$cryptsource" ]; then
message "cryptsetup ($crypttarget): source parameter missing"
return 1
fi
return 0
}
activate_vg()
{
# Sanity checks
if [ ! -x /sbin/lvm ]; then
message "cryptsetup ($crypttarget): lvm is not available"
return 1
fi
# Detect and activate available volume groups
/sbin/lvm vgscan
/sbin/lvm vgchange -a y --sysinit
return $?
}
setup_mapping()
{
local opts count cryptopen cryptremove NEWROOT
opts="$1"
if [ -z "$opts" ]; then
return 0
fi
parse_options "$opts" || return 1
# Wait for USB to settle
/bin/sleep 3
if [ -z "$cryptkeyscript" ]; then
# Test all devices
mkdir -p /tmp/mnt
echo "Searching for cryptkey.txt on available disks... "
for partition in `cat /proc/partitions |awk '{print $4}'|tail -n +3`; do
echo Trying /dev/$partition
if mount /dev/$partition /tmp/mnt 2>/dev/null; then
if cat /tmp/mnt/cryptkey.txt >> /tmp/cryptkeys.txt 2>/dev/null; then
echo "Found keys on /dev/$partition"
fi
umount /dev/$partition
fi
done
echo "Done searching."
if [ ${cryptsource#/dev/disk/by-uuid/} != $cryptsource ]; then
# UUIDs are not very helpful
diskname="$crypttarget"
else
diskname="$cryptsource ($crypttarget)"
fi
cryptkeyscript="/lib/cryptsetup/askpass"
cryptkey="Please unlock disk $diskname: "
elif ! type "$cryptkeyscript" >/dev/null; then
message "cryptsetup ($crypttarget): error - script \"$cryptkeyscript\" missing"
return 1
fi
if [ "$cryptkeyscript" = "cat" ] && [ "${cryptkey#/root/}" != "$cryptkey" ]; then
# skip the mapping if the root FS is not mounted yet
sed -rn 's/^\s*[^#]\S*\s+(\S+)\s.*/\1/p' /proc/mounts | grep -Fxq "$rootmnt" || return 1
# substitute the "/root" prefix by the real root FS mountpoint otherwise
cryptkey="${rootmnt}/${cryptkey#/root/}"
fi
if [ -n "$cryptheader" ] && ! type "$cryptheader" >/dev/null; then
message "cryptsetup ($crypttarget): error - LUKS header \"$cryptheader\" missing"
return 1
fi
# The same target can be specified multiple times
# e.g. root and resume lvs-on-lvm-on-crypto
if [ -e "/dev/mapper/$crypttarget" ]; then
return 0
fi
modprobe -q dm_crypt
# Make sure the cryptsource device is available
if [ ! -e $cryptsource ]; then
activate_vg
fi
# If the encrypted source device hasn't shown up yet, give it a
# little while to deal with removable devices
# the following lines below have been taken from
# /usr/share/initramfs-tools/scripts/local, as suggested per
# https://launchpad.net/bugs/164044
if [ ! -e "$cryptsource" ]; then
log_begin_msg "Waiting for encrypted source device..."
# Default delay is 180s
if [ -z "${ROOTDELAY}" ]; then
slumber=180
else
slumber=${ROOTDELAY}
fi
slumber=$(( ${slumber} * 10 ))
while [ ! -e "$cryptsource" ]; do
# retry for LVM devices every 10 seconds
if [ ${slumber} -eq $(( ${slumber}/100*100 )) ]; then
activate_vg
fi
/bin/sleep 0.1
slumber=$(( ${slumber} - 1 ))
[ ${slumber} -gt 0 ] || break
done
if [ ${slumber} -gt 0 ]; then
log_end_msg 0
else
log_end_msg 1 || true
fi
fi
udev_settle
# We've given up, but we'll let the user fix matters if they can
if [ ! -e "${cryptsource}" ]; then
echo " ALERT! ${cryptsource} does not exist."
echo " Check cryptopts=source= bootarg: cat /proc/cmdline"
echo " or missing modules, devices: cat /proc/modules; ls /dev"
panic -r "Dropping to a shell. Will skip ${cryptsource} if you can't fix."
fi
if [ ! -e "${cryptsource}" ]; then
return 1
fi
# Prepare commands
cryptopen="/sbin/cryptsetup -T 1"
if [ "$cryptdiscard" = "yes" ]; then
cryptopen="$cryptopen --allow-discards"
fi
if [ -n "$cryptheader" ]; then
cryptopen="$cryptopen --header=$cryptheader"
fi
if [ -n "$cryptkeyslot" ]; then
cryptopen="$cryptopen --key-slot=$cryptkeyslot"
fi
if /sbin/cryptsetup isLuks ${cryptheader:-$cryptsource} >/dev/null 2>&1; then
cryptopen="$cryptopen open --type luks $cryptsource $crypttarget --key-file=-"
elif [ "$crypttcrypt" = "yes" ]; then
cryptopen="$cryptopen open --type tcrypt $cryptveracrypt $cryptsource $crypttarget"
else
cryptopen="$cryptopen -c $cryptcipher -s $cryptsize -h $crypthash open --type plain $cryptsource $crypttarget --key-file=-"
fi
cryptremove="/sbin/cryptsetup remove $crypttarget"
NEWROOT="/dev/mapper/$crypttarget"
# Try to get a satisfactory password $crypttries times
count=0
while [ $crypttries -le 0 ] || [ $count -lt $crypttries ]; do
export CRYPTTAB_TRIED="$count"
count=$(( $count + 1 ))
if [ ! -e "$NEWROOT" ]; then
keyfound=0
if [ -e /tmp/cryptkeys.txt ] ; then
echo Trying keys from cryptkey.txt
for key in `cat /tmp/cryptkeys.txt`; do
if crypttarget="$crypttarget" cryptsource="$cryptsource" \
echo -n "$key" | $cryptopen; then
# Found the key
echo Key found in cryptkey.txt
keyfound=1
key=""
fi
done
# Remove traces of the key
rm /tmp/cryptkeys.txt
unset key
fi
echo Keyfound = "$keyfound"
if [ "$keyfound" = "0" ]; then
# Fall back to manual entry
if ! crypttarget="$crypttarget" cryptsource="$cryptsource" \
$cryptkeyscript "$cryptkey" | $cryptopen; then
message "cryptsetup ($crypttarget): cryptsetup failed, bad password or options?"
continue
fi
fi
fi
if [ ! -e "$NEWROOT" ]; then
message "cryptsetup ($crypttarget): unknown error setting up device mapping"
return 1
fi
#FSTYPE=''
#eval $(fstype < "$NEWROOT")
FSTYPE="$(/sbin/blkid -s TYPE -o value "$NEWROOT")"
# See if we need to setup lvm on the crypto device
#if [ "$FSTYPE" = "lvm" ] || [ "$FSTYPE" = "lvm2" ]; then
if [ "$FSTYPE" = "LVM_member" ] || [ "$FSTYPE" = "LVM2_member" ]; then
if [ -z "$cryptlvm" ]; then
message "cryptsetup ($crypttarget): lvm fs found but no lvm configured"
return 1
elif ! activate_vg; then
# disable error message, LP: #151532
#message "cryptsetup ($crypttarget): failed to setup lvm device"
return 1
fi
# Apparently ROOT is already set in /conf/param.conf for
# flashed kernels at least. See bugreport #759720.
if [ -f /conf/param.conf ] && grep -q "^ROOT=" /conf/param.conf; then
NEWROOT=$(sed -n 's/^ROOT=//p' /conf/param.conf)
else
NEWROOT=${cmdline_root:-/dev/mapper/$cryptlvm}
if [ "$cryptrootdev" = "yes" ]; then
# required for lilo to find the root device
echo "ROOT=$NEWROOT" >>/conf/param.conf
fi
fi
#eval $(fstype < "$NEWROOT")
FSTYPE="$(/sbin/blkid -s TYPE -o value "$NEWROOT")"
fi
#if [ -z "$FSTYPE" ] || [ "$FSTYPE" = "unknown" ]; then
if [ -z "$FSTYPE" ]; then
message "cryptsetup ($crypttarget): unknown fstype, bad password or options?"
udev_settle
$cryptremove
continue
fi
# decrease $count by 1, apparently last try was successful.
count=$(( $count - 1 ))
message "cryptsetup ($crypttarget): set up successfully"
break
done
failsleep=60 # make configurable later?
if [ "$cryptrootdev" = "yes" ] && [ $crypttries -gt 0 ] && [ $count -ge $crypttries ]; then
message "cryptsetup ($crypttarget): maximum number of tries exceeded"
message "cryptsetup: going to sleep for $failsleep seconds..."
sleep $failsleep
exit 1
fi
udev_settle
return 0
}
#
# Begin real processing
#
# Do we have any kernel boot arguments?
cmdline_cryptopts=''
unset cmdline_root
for opt in $(cat /proc/cmdline); do
case $opt in
cryptopts=*)
opt="${opt#cryptopts=}"
if [ -n "$opt" ]; then
if [ -n "$cmdline_cryptopts" ]; then
cmdline_cryptopts="$cmdline_cryptopts $opt"
else
cmdline_cryptopts="$opt"
fi
fi
;;
root=*)
opt="${opt#root=}"
case $opt in
/*) # Absolute path given. Not lilo major/minor number.
cmdline_root=$opt
;;
*) # lilo major/minor number (See #398957). Ignore
esac
;;
esac
done
if [ -n "$cmdline_cryptopts" ]; then
# Call setup_mapping separately for each possible cryptopts= setting
for cryptopt in $cmdline_cryptopts; do
setup_mapping "$cryptopt"
done
exit 0
fi
# Do we have any settings from the /conf/conf.d/cryptroot file?
if [ -r /conf/conf.d/cryptroot ]; then
while read mapping <&3; do
setup_mapping "$mapping" 3<&-
done 3< /conf/conf.d/cryptroot
fi
exit 0