#!/bin/sh
# -*- mode: shell-script; indent-tabs-mode: nil; sh-basic-offset: 4; -*-
# ex: ts=8 sw=4 sts=4 et filetype=sh
PATH=/usr/sbin:/usr/bin:/sbin:/bin
NEWROOT=${NEWROOT:-"/sysroot"}
# do not ask, if we already have root
[ -f $NEWROOT/proc ] && exit 0
# check if destination already exists
[ -b /dev/mapper/$2 ] && exit 0
# we already asked for this device
[ -f /tmp/cryptroot-asked-$2 ] && exit 0
# load dm_crypt if it is not already loaded
[ -d /sys/module/dm_crypt ] || modprobe dm_crypt
. /lib/dracut-crypt-lib.sh
# default luksname - luks-UUID
luksname=$2
# fallback to passphrase
ask_passphrase=1
# if device name is /dev/dm-X, convert to /dev/mapper/name
if [ "${1##/dev/dm-}" != "$1" ]; then
device="/dev/mapper/$(dmsetup info -c --noheadings -o name "$1")"
else
device="$1"
fi
# number of tries
numtries=${3:-10}
# TODO: improve to support what cmdline does
if [ -f /etc/crypttab ] && getargbool 1 rd.luks.crypttab -d -n rd_NO_CRYPTTAB; then
while read name dev luksfile luksoptions; do
# ignore blank lines and comments
if [ -z "$name" -o "${name#\#}" != "$name" ]; then
continue
fi
# UUID used in crypttab
if [ "${dev%%=*}" = "UUID" ]; then
if [ "luks-${dev##UUID=}" = "$2" ]; then
luksname="$name"
break
fi
# path used in crypttab
else
cdev=$(readlink -f $dev)
mdev=$(readlink -f $device)
if [ "$cdev" = "$mdev" ]; then
luksname="$name"
break
fi
fi
done < /etc/crypttab
unset name dev
fi
#
# Open LUKS device
#
info "luksOpen $device $luksname $luksfile $luksoptions"
OLD_IFS="$IFS"
IFS=,
set -- $luksoptions
IFS="$OLD_IFS"
while [ $# -gt 0 ]; do
case $1 in
noauto)
# skip this
exit 0
;;
swap)
# skip this
exit 0
;;
tmp)
# skip this
exit 0
;;
allow-discards)
allowdiscards="--allow-discards"
esac
shift
done
# parse for allow-discards
if strstr "$(cryptsetup --help)" "allow-discards"; then
if discarduuids=$(getargs "rd.luks.allow-discards"); then
discarduuids=$(str_replace "$discarduuids" 'luks-' '')
if strstr " $discarduuids " " ${luksdev##luks-}"; then
allowdiscards="--allow-discards"
fi
elif getargbool 0 rd.luks.allow-discards; then
allowdiscards="--allow-discards"
fi
fi
if strstr "$(cryptsetup --help)" "allow-discards"; then
cryptsetupopts="$cryptsetupopts $allowdiscards"
fi
unset allowdiscards
if [ -n "$luksfile" -a "$luksfile" != "none" -a -e "$luksfile" ]; then
if cryptsetup --key-file "$luksfile" $cryptsetupopts luksOpen "$device" "$luksname"; then
ask_passphrase=0
fi
else
while [ -n "$(getarg rd.luks.key)" ]; do
if tmp=$(getkey /tmp/luks.keys $device); then
keydev="${tmp%%:*}"
keypath="${tmp#*:}"
else
if [ $numtries -eq 0 ]; then
warn "No key found for $device. Fallback to passphrase mode."
break
fi
sleep 1
info "No key found for $device. Will try $numtries time(s) more later."
initqueue --unique --onetime --settled \
--name cryptroot-ask-$luksname \
$(command -v cryptroot-ask) "$device" "$luksname" "$(($numtries-1))"
exit 0
fi
unset tmp
info "Using '$keypath' on '$keydev'"
readkey "$keypath" "$keydev" "$device" \
| cryptsetup -d - $cryptsetupopts luksOpen "$device" "$luksname"
unset keypath keydev
ask_passphrase=0
break
done
fi
if [ $ask_passphrase -ne 0 ]; then
luks_open="$(command -v cryptsetup) $cryptsetupopts luksOpen"
ask_for_password --ply-tries 5 \
--ply-cmd "$luks_open -T1 $device $luksname" \
--ply-prompt "Password ($device)" \
--tty-tries 1 \
--tty-cmd "$luks_open -T5 $device $luksname"
unset luks_open
fi
unset device luksname luksfile
# mark device as asked
>> /tmp/cryptroot-asked-$2
need_shutdown
udevsettle
exit 0