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|
#!/bin/sh
set -e
PREREQ=""
prereqs()
{
echo "$PREREQ"
}
case $1 in
prereqs)
prereqs
exit 0
;;
esac
#Check whether loop-aes support is forced on or off
case "${INITRAMFS_LOOPAES}" in
0|no|off)
exit 0
;;
1|yes|on)
FORCE_LOOPAES=1
;;
auto|)
;;
*)
echo "WARNING! (loop-aes) ignoring invalid INITRAMFS_LOOPAES value ${INITRAMFS_LOOPAES}" 1>&2
esac
. /usr/share/initramfs-tools/hook-functions
exit_unless_forced() {
if [ -z "${FORCE_LOOPAES}" ]; then
exit $1
fi
}
get_root_device() {
[ -r /etc/fstab ] || return
grep '^[^#]' /etc/fstab | ( \
while read dev mount type options dump pass; do
if [ "$mount" = "/" ]; then
echo "rootdev=\"${dev}\" rootoptions=\"${options}\""
return
fi
done )
}
decode_cipher() {
local cipher
case "$1" in
twofish*)
echo twofish
;;
blowfish*)
echo blowfish
;;
serpent*)
echo serpent
;;
mars*|rc6*|tripleDES)
echo "WARNING| (loop-aes) Don't know how to handle encryption type $1" 1>&2
;;
NONE|XOR|AES*)
;;
*)
echo "WARNING| (loop-aes) Unknown encryption type $1" 1>&2
;;
esac
}
iterate_cipher_module() {
local cipher
local IFS=":"
for cipher in $2; do
$1 "loop_${cipher}"
done
}
get_root_opts() {
local opt cipher
local IFS=", "
for opt in $rootoptions; do
case "$opt" in
encryption=*)
cipher="$(decode_cipher \"${opt#encryption=}\")"
if [ -n "$cipher" ]; then
rootencryption="${rootencryption}${rootencryption:+:}${cipher}"
fi
loopaes_opts="${loopaes_opts},${opt}"
;;
offset=*)
loopaes_opts="${loopaes_opts},${opt}"
;;
sizelimit=*)
loopaes_opts="${loopaes_opts},${opt}"
;;
pseed=*)
loopaes_opts="${loopaes_opts},${opt}"
;;
phash=*)
loopaes_opts="${loopaes_opts},${opt}"
;;
loinit=*)
loopaes_opts="${loopaes_opts},${opt}"
;;
itercountk=*)
loopaes_opts="${loopaes_opts},${opt}"
;;
gpgkey=*)
rootgpgkey=${opt#gpgkey=}
;;
gpghome=*)
rootgpghome=${opt#gpghome=}
;;
loop=*)
rootloop=${opt#loop=}
;;
*)
# Presumably a non-supported or filesystem option
;;
esac
done
}
# Find out which device root is on
eval $(get_root_device)
[ -z "${rootdev}" ] && exit_unless_forced 0
# We now have set: rootdev rootoptions
get_root_opts
[ -z "${rootloop}" ] && exit_unless_forced 0
loopaes_opts="${loopaes_opts},loop=${rootloop}"
# Prepare the initramfs
if [ -n "${rootgpgkey}" ]; then
mkdir ${DESTDIR}/keys/
cp "${rootgpgkey}" ${DESTDIR}/keys/rootkeyfile.gpg
copy_exec /usr/bin/gpg /bin/
loopaes_opts="${loopaes_opts},gpgkey=/keys/rootkeyfile.gpg"
fi
if [ -n "${rootgpghome}" ]; then
cp -R "${rootgpghome}" ${DESTDIR}/.gnupg
else
mkdir ${DESTDIR}/.gnupg/
fi
loopaes_opts="${loopaes_opts},gpghome=/.gnupg"
echo "LOOPAESOPTS=\"$loopaes_opts\"" > ${DESTDIR}/conf/conf.d/loopaes
copy_exec /sbin/losetup /sbin/
# Allow the correct keymap to be loaded if possible
if [ -e /bin/loadkeys -a -r /etc/console/boottime.kmap.gz ]; then
copy_exec /bin/loadkeys /bin/
cp /etc/console/boottime.kmap.gz $DESTDIR/etc/
fi
manual_add_modules loop
if [ -z "${FORCE_LOOPAES}" ]; then
iterate_cipher_module "manual_add_modules" "$rootencryption"
else
iterate_cipher_module "manual_add_modules" "serpent:blowfish:twofish"
fi
# Done
exit 0
|
