298 lines
9.7 KiB
Bash
298 lines
9.7 KiB
Bash
#!/bin/sh
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PREREQ="cryptroot-prepare"
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#
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# Standard initramfs preamble
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#
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prereqs()
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{
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# Make sure that cryptroot is run last in local-top
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local req
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for req in "${0%/*}"/*; do
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script="${req##*/}"
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if [ "$script" != "${0##*/}" ]; then
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printf '%s\n' "$script"
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fi
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done
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}
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case $1 in
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prereqs)
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prereqs
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exit 0
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;;
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esac
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. /scripts/functions
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[ -f /lib/cryptsetup/functions ] || return 0
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. /lib/cryptsetup/functions
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# wait_for_source()
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# Wait for encrypted $CRYPTTAB_SOURCE . Set $CRYPTTAB_SOURCE
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# to its normalized device name when it shows up;
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# return 1 if timeout.
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wait_for_source() {
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wait_for_udev 10
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if crypttab_resolve_source; then
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# the device is here already, no need to loop
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return 0
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fi
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# If the source device hasn't shown up yet, give it a little while
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# to allow for asynchronous device discovery (e.g. USB).
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#
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# We also need to take into account RAID or other devices that may
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# only be available on local-block stage. So, wait 5 seconds upfront,
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# in local-top; if that fails, end execution relying on local-block
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# invocations. Allow $ROOTDELAY/3 invocations with 1s sleep times (with
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# a minimum of 30 invocations), and if after that we still fail, then it's
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# really time to give-up. Variable $initrd_cnt tracks the re-invocations.
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#
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# Part of the lines below has been taken from initramfs-tools
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# scripts/local's local_device_setup(), as suggested per
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# https://launchpad.net/bugs/164044 .
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local slumber=1
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if [ ! -f "${CRYPTR_LOCAL_BLOCK}" ]; then # we are running on local-top
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slumber=5
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fi
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cryptsetup_message "Waiting for encrypted source device $CRYPTTAB_SOURCE..."
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while [ $slumber -gt 0 ]; do
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sleep 1
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if [ -x /scripts/local-block/lvm2 ]; then
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# activate any VG that might hold $CRYPTTAB_SOURCE
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/scripts/local-block/lvm2 "$CRYPTTAB_SOURCE"
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fi
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if crypttab_resolve_source; then
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wait_for_udev 10
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return 0
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fi
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slumber=$(( $slumber - 1 ))
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done
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return 1
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}
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# setup_mapping()
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# Set up a crypttab(5) mapping defined by $CRYPTTAB_NAME,
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# $CRYPTTAB_SOURCE, $CRYPTTAB_KEY, $CRYPTTAB_OPTIONS.
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setup_mapping() {
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local dev initrd_cnt
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# We control here the number of re-invocations of this script from
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# local-block - the heuristic is $ROOTDELAY/3, with a minimum of 30.
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# This number is somewhat dictated by mdadm, we want to run more times
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# than that script, to allow decrypting volumes on top of arrays.
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if [ -f "${CRYPTR_CNT_FILE}" ]; then
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initrd_cnt=$(cat ${CRYPTR_CNT_FILE})
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else
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initrd_cnt=${ROOTDELAY:-90}
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initrd_cnt=$((initrd_cnt/3))
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if [ "${initrd_cnt}" -lt 30 ]; then
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initrd_cnt=30
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fi
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echo ${initrd_cnt} > "${CRYPTR_CNT_FILE}"
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fi
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# The same target can be specified multiple times
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# e.g. root and resume lvs-on-lvm-on-crypto
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if dm_blkdevname "$CRYPTTAB_NAME" >/dev/null; then
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return 0
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fi
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crypttab_parse_options --export --missing-path=fail || return 1
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if ! wait_for_source; then
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if [ ${initrd_cnt} -le 0 ]; then
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# we've given up
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if [ -n "$panic" ]; then
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panic "ALERT! encrypted source device $CRYPTTAB_SOURCE does not exist, can't unlock $CRYPTTAB_NAME."
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else
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# let the user fix matters if they can
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echo " ALERT! encrypted source device $CRYPTTAB_SOURCE does not exist, can't unlock $CRYPTTAB_NAME."
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echo " Check cryptopts=source= bootarg: cat /proc/cmdline"
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echo " or missing modules, devices: cat /proc/modules; ls /dev"
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panic "Dropping to a shell."
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fi
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return 1 # can't continue because environment is lost
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else
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initrd_cnt=$((initrd_cnt - 1))
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echo ${initrd_cnt} > "${CRYPTR_CNT_FILE}"
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return 0 # allow some attempts on local-block stage
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fi
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fi
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# our `cryptroot-unlock` script searches for cryptsetup processes
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# with a given CRYPTTAB_NAME it their environment
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export CRYPTTAB_NAME
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if [ -z "${CRYPTTAB_OPTION_keyscript+x}" ]; then
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# no keyscript: interactive unlocking, or key file
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if [ "${CRYPTTAB_KEY#/FIXME-initramfs-rootmnt/}" != "$CRYPTTAB_KEY" ]; then
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# skip the mapping for now if the root FS is not mounted yet
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sed -rn 's/^\s*[^#[:blank:]]\S*\s+(\S+)\s.*/\1/p' /proc/mounts | grep -Fxq -- "$rootmnt" || return 1
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# substitute the "/FIXME-initramfs-rootmnt/" prefix by the real root FS mountpoint otherwise
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CRYPTTAB_KEY="$rootmnt/${CRYPTTAB_KEY#/FIXME-initramfs-rootmnt/}"
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fi
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if [ "$CRYPTTAB_KEY" != "none" ]; then
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if [ ! -e "$CRYPTTAB_KEY" ]; then
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cryptsetup_message "ERROR: Skipping target $CRYPTTAB_NAME: non-existing key file $CRYPTTAB_KEY"
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return 1
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fi
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# try only once if we have a key file
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CRYPTTAB_OPTION_tries=1
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fi
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fi
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get_crypt_type # set CRYPTTAB_TYPE to the type of crypt device
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local count=0 maxtries="${CRYPTTAB_OPTION_tries:-3}" fstype vg rv
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while [ $maxtries -le 0 ] || [ $count -lt $maxtries ]; do
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if [ -z "${CRYPTTAB_OPTION_keyscript+x}" ] && [ "$CRYPTTAB_KEY" != "none" ]; then
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# unlock via keyfile
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unlock_mapping "$CRYPTTAB_KEY"
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else
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if [ -z "${CRYPTTAB_OPTION_keyscript+x}" ]; then
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# Wait for USB to settle
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/bin/sleep 3
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# Test all devices
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mkdir /mnt
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echo -n "Searching for cryptkey.txt on available disks... "
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local partition
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for partition in `cat /proc/partitions |awk '{print $4}'|tail -n +3`; do
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if mount /dev/$partition /mnt 2>/dev/null; then
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cat /mnt/cryptkey.txt >> /tmp/cryptkeys.txt 2>/dev/null
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umount /dev/$partition
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fi
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done
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echo "done."
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fi
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if [ -s /tmp/cryptkeys.txt ]; then
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local keyfound
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keyfound=0
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echo Trying keys from cryptkey.txt
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for key in `cat /tmp/cryptkeys.txt`; do
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if echo -n "$key" | unlock_mapping; then
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# Found the key
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echo Key found in cryptkey.txt
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keyfound=1
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key=""
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fi
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done
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# Remove traces of the key
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rm /tmp/cryptkeys.txt
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unset key
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if [ "$keyfound" = "0" ]; then
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# Fall back to manual entry
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run_keyscript "$CRYPTTAB_KEY" "$count" | unlock_mapping
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fi
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else
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# unlock interactively or via keyscript
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run_keyscript "$CRYPTTAB_KEY" "$count" | unlock_mapping
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fi
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fi
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rv=$?
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count=$(( $count + 1 ))
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if [ $rv -ne 0 ]; then
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cryptsetup_message "ERROR: $CRYPTTAB_NAME: cryptsetup failed, bad password or options?"
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sleep 1
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continue
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elif ! dev="$(dm_blkdevname "$CRYPTTAB_NAME")"; then
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cryptsetup_message "ERROR: $CRYPTTAB_NAME: unknown error setting up device mapping"
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return 1
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fi
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if ! fstype="$(get_fstype "$dev")" || [ "$fstype" = "unknown" ]; then
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if [ "$CRYPTTAB_TYPE" != "luks" ]; then
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# bad password for plain dm-crypt device? or mkfs not run yet?
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cryptsetup_message "ERROR: $CRYPTTAB_NAME: unknown fstype, bad password or options?"
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wait_for_udev 10
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/sbin/cryptsetup remove -- "$CRYPTTAB_NAME"
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sleep 1
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continue
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fi
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elif [ "$fstype" = lvm2 ]; then
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if [ ! -x /sbin/lvm ]; then
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cryptsetup_message "WARNING: $CRYPTTAB_NAME: lvm is not available"
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return 1
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elif vg="$(lvm pvs --noheadings -o vg_name --config 'log{prefix=""}' -- "$dev")"; then
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# activate the VG held by the PV we just unlocked
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lvm lvchange -a y --sysinit --ignoreskippedcluster -- "$vg"
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fi
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fi
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cryptsetup_message "$CRYPTTAB_NAME: set up successfully"
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wait_for_udev 10
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return 0
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done
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cryptsetup_message "ERROR: $CRYPTTAB_NAME: maximum number of tries exceeded"
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if [ -f "${CRYPTR_CNT_FILE}" ]; then
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echo 0 > "${CRYPTR_CNT_FILE}"
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fi
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exit 1
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}
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#######################################################################
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# Begin real processing
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mkdir -p /cryptroot # might not exist yet if the main system has no crypttab(5)
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# Do we have any kernel boot arguments?
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if ! grep -qE '^(.*\s)?cryptopts=' /proc/cmdline; then
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# ensure $TABFILE exists and has a mtime greater than the boot time
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# (existing $TABFILE is preserved)
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touch -- "$TABFILE"
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else
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# let the read builtin unescape the '\' as GRUB substitutes '\' by '\\' in the cmdline
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tr ' ' '\n' </proc/cmdline | sed -n 's/^cryptopts=//p' | while IFS= read cryptopts; do
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# skip empty values (which can be used to disable the initramfs
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# scripts for a particular boot, cf. #873840)
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[ -n "$cryptopts" ] || continue
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unset -v target source key options
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IFS=","
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for x in $cryptopts; do
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case "$x" in
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target=*) target="${x#target=}";;
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source=*) source="${x#source=}";;
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key=*) key="${x#key=}";;
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*) options="${options+$options,}$x";;
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esac
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done
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if [ -z "${source:+x}" ]; then
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cryptsetup_message "ERROR: Missing source= value in kernel parameter cryptopts=$cryptopts"
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else
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# preserve mangling
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printf '%s %s %s %s\n' "${target:-cryptroot}" "$source" "${key:-none}" "${options-}"
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fi
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done >"$TABFILE"
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fi
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# Do we have any settings from the $TABFILE?
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if [ -s "$TABFILE" ]; then
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# Create locking directory before invoking cryptsetup(8) to avoid warnings
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mkdir -pm0700 /run/cryptsetup
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modprobe -q dm_crypt
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crypttab_foreach_entry setup_mapping
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fi
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exit 0
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