diff options
Diffstat (limited to 'abs/core/cryptsetup/encrypt_hook')
| -rw-r--r-- | abs/core/cryptsetup/encrypt_hook | 122 |
1 files changed, 122 insertions, 0 deletions
diff --git a/abs/core/cryptsetup/encrypt_hook b/abs/core/cryptsetup/encrypt_hook new file mode 100644 index 0000000..248f1f2 --- /dev/null +++ b/abs/core/cryptsetup/encrypt_hook @@ -0,0 +1,122 @@ +# vim: set ft=sh: +# TODO this one needs some work to work with lots of different +# encryption schemes +run_hook () +{ + /sbin/modprobe -a -q dm-crypt >/dev/null 2>&1 + if [ -e "/sys/class/misc/device-mapper" ]; then + if [ ! -c "/dev/mapper/control" ]; then + read dev_t < /sys/class/misc/device-mapper/dev + /bin/mknod "/dev/mapper/control" c $(/bin/replace "${dev_t}" ':') + fi + [ "${quiet}" = "y" ] && CSQUIET=">/dev/null" + + # Get keyfile if specified + ckeyfile="/crypto_keyfile.bin" + if [ "x${cryptkey}" != "x" ]; then + set -- $(/bin/replace "${cryptkey}" ':'); ckdev=$1; ckarg1=$2; ckarg2=$3 + try=10 + echo "Waiting for ${ckdev} ..." + while [ ! -b ${ckdev} -a ${try} -gt 0 ]; do + sleep 1 + try=$((${try}-1)) + done + if [ -b ${ckdev} ]; 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} ${ckdev} /ckey + dd if=/ckey/${ckarg2} of=${ckeyfile} >/dev/null 2>&1 + umount /ckey + ;; + *) + # Read raw data from the block device + # ckarg1 is numeric: ckarg1=offset, ckarg2=length + dd if=${ckdev} 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 + set -- $(/bin/replace "${cryptdevice}" ':'); cryptdev="$1"; cryptname="$2"; + else + cryptdev="${root}" + cryptname="root" + fi + + if /bin/cryptsetup isLuks ${cryptdev} >/dev/null 2>&1; then + dopassphrase=1 + # If keyfile exists, try to use that + if [ -f ${ckeyfile} ]; then + if eval /bin/cryptsetup --key-file ${ckeyfile} luksOpen ${cryptdev} ${cryptname} ${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 /bin/cryptsetup luksOpen ${cryptdev} ${cryptname} ${CSQUIET}; do + sleep 2; + done + fi + if [ -e "/dev/mapper/${cryptname}" ]; then + if [ "${cryptname}" = "root" ]; then + export root="/dev/mapper/root" + fi + else + err "Password succeeded, but ${cryptname} creation failed, aborting..." + exit 1 + fi + elif [ "x${crypto}" != "x" ]; then + do_oldcrypto () + { + if [ $# -ne 5 ]; then + err "Verify parameter format: crypto=hash:cipher:keysize:offset:skip" + err "Non-LUKS decryption not attempted..." + return 1 + fi + exe="/bin/cryptsetup create ${cryptname} ${cryptdev}" + [ "x$(eval echo ${1})" != "x" ] && exe="${exe} --hash \"$(eval echo ${1})\"" + [ "x$(eval echo ${2})" != "x" ] && exe="${exe} --cipher \"$(eval echo ${2})\"" + [ "x$(eval echo ${3})" != "x" ] && exe="${exe} --key-size \"$(eval echo ${3})\"" + [ "x$(eval echo ${4})" != "x" ] && exe="${exe} --offset \"$(eval echo ${4})\"" + [ "x$(eval echo ${5})" != "x" ] && exe="${exe} --skip \"$(eval echo ${5})\"" + 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}" + } + + msg "Non-LUKS encrypted device found..." + do_oldcrypto $(/bin/replace -q "${crypto}" ':') + + 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 [ "${cryptname}" = "root" ]; then + export root="/dev/mapper/root" + fi + else + err "Password succeeded, but ${cryptname} creation failed, aborting..." + exit 1 + fi + fi + nuke ${ckeyfile} + fi +} |