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|
#!/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
$cryptkey
EOF
if resolved=$(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
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."
}
for cryptopt in ${cryptoptions//,/ }; do
case ${cryptopt} in
allow-discards)
echo "Enabling TRIM/discard support."
cryptargs="${cryptargs} --allow-discards"
;;
*)
echo "Encryption option '${cryptopt}' not known, ignoring." >&2
;;
esac
done
if resolved=$(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} luksOpen ${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 luksOpen ${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 ${cryptname} creation failed, aborting..."
exit 1
fi
elif [ -n "${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 create $cryptname $resolved $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 $ckeyfile"
else
exe="$exe --verify-passphrase"
echo ""
echo "A password is required to access the ${cryptname} volume:"
fi
eval "$exe $CSQUIET"
if [ $? -ne 0 ]; then
err "Non-LUKS device decryption failed. verify format: "
err " crypto=hash:cipher:keysize:offset:skip"
exit 1
fi
if [ -e "/dev/mapper/${cryptname}" ]; then
if [ ${DEPRECATED_CRYPT} -eq 1 ]; then
export root="/dev/mapper/root"
fi
else
err "Password succeeded, but ${cryptname} creation failed, aborting..."
exit 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:
|
