#!/usr/bin/ash run_hook() { modprobe -a -q dm-crypt >/dev/null 2>&1 [ "${quiet}" = "y" ] && CSQUIET=">/dev/null" # Get keyfile if specified ckeyfile="/crypto_keyfile.bin" if [ -n "$cryptkey" ]; then IFS=: read ckdev ckarg1 ckarg2 <<EOF $cryptkey EOF if [ "$ckdev" = "rootfs" ]; then ckeyfile=$ckarg1 elif resolved=$(resolve_device "${ckdev}" ${rootdelay}); then case ${ckarg1} in *[!0-9]*) # Use a file on the device # ckarg1 is not numeric: ckarg1=filesystem, ckarg2=path mkdir /ckey mount -r -t "$ckarg1" "$resolved" /ckey dd if="/ckey/$ckarg2" of="$ckeyfile" >/dev/null 2>&1 umount /ckey ;; *) # Read raw data from the block device # ckarg1 is numeric: ckarg1=offset, ckarg2=length dd if="$resolved" of="$ckeyfile" bs=1 skip="$ckarg1" count="$ckarg2" >/dev/null 2>&1 ;; esac fi [ ! -f ${ckeyfile} ] && echo "Keyfile could not be opened. Reverting to passphrase." fi if [ -n "${cryptdevice}" ]; then DEPRECATED_CRYPT=0 IFS=: read cryptdev cryptname cryptoptions <<EOF $cryptdevice EOF else DEPRECATED_CRYPT=1 cryptdev="${root}" cryptname="root" fi # This may happen if third party hooks do the crypt setup if [ -b "/dev/mapper/${cryptname}" ]; then echo "Device ${cryptname} already exists, not doing any crypt setup." return 0 fi warn_deprecated() { echo "The syntax 'root=${root}' where '${root}' is an encrypted volume is deprecated" echo "Use 'cryptdevice=${root}:root root=/dev/mapper/root' instead." } set -f OLDIFS="$IFS"; IFS=, for cryptopt in ${cryptoptions}; do case ${cryptopt} in allow-discards|discard) cryptargs="${cryptargs} --allow-discards" ;; no-read-workqueue|perf-no_read_workqueue) cryptargs="${cryptargs} --perf-no_read_workqueue" ;; no-write-workqueue|perf-no_write_workqueue) cryptargs="${cryptargs} --perf-no_write_workqueue" ;; *) echo "Encryption option '${cryptopt}' not known, ignoring." >&2 ;; esac done set +f IFS="$OLDIFS" unset OLDIFS if resolved=$(resolve_device "${cryptdev}" ${rootdelay}); then if cryptsetup isLuks ${resolved} >/dev/null 2>&1; then [ ${DEPRECATED_CRYPT} -eq 1 ] && warn_deprecated dopassphrase=1 # If keyfile exists, try to use that if [ -f ${ckeyfile} ]; then if eval cryptsetup --key-file ${ckeyfile} open --type luks ${resolved} ${cryptname} ${cryptargs} ${CSQUIET}; then dopassphrase=0 else echo "Invalid keyfile. Reverting to passphrase." fi fi # Ask for a passphrase if [ ${dopassphrase} -gt 0 ]; then echo "" echo "A password is required to access the ${cryptname} volume:" #loop until we get a real password while ! eval cryptsetup open --type luks ${resolved} ${cryptname} ${cryptargs} ${CSQUIET}; do sleep 2; done fi if [ -e "/dev/mapper/${cryptname}" ]; then if [ ${DEPRECATED_CRYPT} -eq 1 ]; then export root="/dev/mapper/root" fi else err "Password succeeded, but ${cryptname} creation failed, aborting..." return 1 fi elif [ -n "${crypto}" ]; then [ ${DEPRECATED_CRYPT} -eq 1 ] && warn_deprecated msg "Non-LUKS encrypted device found..." if echo "$crypto" | awk -F: '{ exit(NF == 5) }'; then err "Verify parameter format: crypto=hash:cipher:keysize:offset:skip" err "Non-LUKS decryption not attempted..." return 1 fi exe="cryptsetup open --type plain $resolved $cryptname $cryptargs" IFS=: read c_hash c_cipher c_keysize c_offset c_skip <<EOF $crypto EOF [ -n "$c_hash" ] && exe="$exe --hash '$c_hash'" [ -n "$c_cipher" ] && exe="$exe --cipher '$c_cipher'" [ -n "$c_keysize" ] && exe="$exe --key-size '$c_keysize'" [ -n "$c_offset" ] && exe="$exe --offset '$c_offset'" [ -n "$c_skip" ] && exe="$exe --skip '$c_skip'" if [ -f "$ckeyfile" ]; then exe="$exe --key-file $ckeyfile" else echo "" echo "A password is required to access the ${cryptname} volume:" fi eval "$exe $CSQUIET" if [ $? -ne 0 ]; then err "Non-LUKS device decryption failed. verify format: " err " crypto=hash:cipher:keysize:offset:skip" return 1 fi if [ -e "/dev/mapper/${cryptname}" ]; then if [ ${DEPRECATED_CRYPT} -eq 1 ]; then export root="/dev/mapper/root" fi else err "Password succeeded, but ${cryptname} creation failed, aborting..." return 1 fi else err "Failed to open encryption mapping: The device ${cryptdev} is not a LUKS volume and the crypto= paramater was not specified." fi fi rm -f ${ckeyfile} } # vim: set ft=sh ts=4 sw=4 et: