diff options
Diffstat (limited to 'core/cryptsetup/encrypt_hook')
| -rw-r--r-- | core/cryptsetup/encrypt_hook | 131 |
1 files changed, 131 insertions, 0 deletions
diff --git a/core/cryptsetup/encrypt_hook b/core/cryptsetup/encrypt_hook new file mode 100644 index 000000000..e84bc6ed7 --- /dev/null +++ b/core/cryptsetup/encrypt_hook @@ -0,0 +1,131 @@ +# 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 [ ! -e "/dev/mapper/control" ]; then + /bin/mknod "/dev/mapper/control" c $(cat /sys/class/misc/device-mapper/dev | sed 's|:| |') + fi + [ "${quiet}" = "y" ] && CSQUIET=">/dev/null" + + # Get keyfile if specified + ckeyfile="/crypto_keyfile.bin" + if [ "x${cryptkey}" != "x" ]; then + ckdev="$(echo "${cryptkey}" | cut -d: -f1)" + ckarg1="$(echo "${cryptkey}" | cut -d: -f2)" + ckarg2="$(echo "${cryptkey}" | cut -d: -f3)" + if poll_device "${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} ${ckdev} /ckey + dd if=/ckey/${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 + DEPRECATED_CRYPT=0 + cryptdev="$(echo "${cryptdevice}" | cut -d: -f1)" + cryptname="$(echo "${cryptdevice}" | cut -d: -f2)" + 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." + } + + if poll_device "${cryptdev}" ${rootdelay}; then + if /sbin/cryptsetup isLuks ${cryptdev} >/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 /sbin/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 /sbin/cryptsetup luksOpen ${cryptdev} ${cryptname} ${CSQUIET}; do + sleep 2; + done + fi + if [ -e "/dev/mapper/${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 [ $# -ne 5 ]; then + err "Verify parameter format: crypto=hash:cipher:keysize:offset:skip" + err "Non-LUKS decryption not attempted..." + return 1 + fi + exe="/sbin/cryptsetup create ${cryptname} ${cryptdev}" + tmp=$(echo "${crypto}" | cut -d: -f1) + [ -n "${tmp}" ] && exe="${exe} --hash \"${tmp}\"" + tmp=$(echo "${crypto}" | cut -d: -f2) + [ -n "${tmp}" ] && exe="${exe} --cipher \"${tmp}\"" + tmp=$(echo "${crypto}" | cut -d: -f3) + [ -n "${tmp}" ] && exe="${exe} --key-size \"${tmp}\"" + tmp=$(echo "${crypto}" | cut -d: -f4) + [ -n "${tmp}" ] && exe="${exe} --offset \"${tmp}\"" + tmp=$(echo "${crypto}" | cut -d: -f5) + [ -n "${tmp}" ] && exe="${exe} --skip \"${tmp}\"" + 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} + fi +} |