463 lines
11 KiB
Bash
Executable file
463 lines
11 KiB
Bash
Executable file
#!/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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for req in $(dirname $0)/*; do
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script=${req##*/}
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if [ $script != cryptroot ]; then
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echo $script
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fi
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done
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}
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case $1 in
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prereqs)
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prereqs
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exit 0
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;;
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esac
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# source for log_*_msg() functions, see LP: #272301
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. /scripts/functions
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#
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# Helper functions
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#
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message()
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{
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if [ -x /bin/plymouth ] && plymouth --ping; then
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plymouth message --text="$@"
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else
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echo "$@" >&2
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fi
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return 0
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}
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udev_settle()
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{
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# Wait for udev to be ready, see https://launchpad.net/bugs/85640
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if command -v udevadm >/dev/null 2>&1; then
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udevadm settle --timeout=30
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elif command -v udevsettle >/dev/null 2>&1; then
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udevsettle --timeout=30
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fi
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return 0
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}
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parse_options()
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{
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local cryptopts
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cryptopts="$1"
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if [ -z "$cryptopts" ]; then
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return 1
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fi
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# Defaults
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cryptcipher=aes-cbc-essiv:sha256
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cryptsize=256
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crypthash=ripemd160
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crypttarget=cryptroot
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cryptsource=""
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cryptheader=""
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cryptlvm=""
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cryptkeyscript=""
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cryptkey="" # This is only used as an argument to an eventual keyscript
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cryptkeyslot=""
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crypttries=3
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crypttcrypt=""
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cryptveracrypt=""
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cryptrootdev=""
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cryptdiscard=""
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CRYPTTAB_OPTIONS=""
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local IFS=" ,"
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for x in $cryptopts; do
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case $x in
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hash=*)
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crypthash=${x#hash=}
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;;
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size=*)
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cryptsize=${x#size=}
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;;
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cipher=*)
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cryptcipher=${x#cipher=}
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;;
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target=*)
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crypttarget=${x#target=}
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export CRYPTTAB_NAME="$crypttarget"
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;;
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source=*)
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cryptsource=${x#source=}
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if [ ${cryptsource#UUID=} != $cryptsource ]; then
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cryptsource="/dev/disk/by-uuid/${cryptsource#UUID=}"
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elif [ ${cryptsource#LABEL=} != $cryptsource ]; then
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cryptsource="/dev/disk/by-label/$(printf '%s' "${cryptsource#LABEL=}" | sed 's,/,\\x2f,g')"
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fi
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export CRYPTTAB_SOURCE="$cryptsource"
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;;
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header=*)
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cryptheader=${x#header=}
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if [ ! -e "$cryptheader" ] && [ -e "/conf/conf.d/cryptheader/$cryptheader" ]; then
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cryptheader="/conf/conf.d/cryptheader/$cryptheader"
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fi
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export CRYPTTAB_HEADER="$cryptheader"
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;;
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lvm=*)
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cryptlvm=${x#lvm=}
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;;
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keyscript=*)
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cryptkeyscript=${x#keyscript=}
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;;
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key=*)
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if [ "${x#key=}" != "none" ]; then
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cryptkey=${x#key=}
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fi
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export CRYPTTAB_KEY="$cryptkey"
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;;
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keyslot=*)
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cryptkeyslot=${x#keyslot=}
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;;
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tries=*)
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crypttries="${x#tries=}"
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case "$crypttries" in
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*[![:digit:].]*)
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crypttries=3
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;;
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esac
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;;
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tcrypt)
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crypttcrypt="yes"
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;;
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veracrypt)
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cryptveracrypt="--veracrypt"
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;;
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rootdev)
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cryptrootdev="yes"
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;;
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discard)
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cryptdiscard="yes"
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;;
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esac
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PARAM="${x%=*}"
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if [ "$PARAM" = "$x" ]; then
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VALUE="yes"
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else
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VALUE="${x#*=}"
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fi
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CRYPTTAB_OPTIONS="$CRYPTTAB_OPTIONS $PARAM"
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eval export CRYPTTAB_OPTION_$PARAM="\"$VALUE\""
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done
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export CRYPTTAB_OPTIONS
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if [ -z "$cryptsource" ]; then
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message "cryptsetup ($crypttarget): source parameter missing"
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return 1
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fi
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return 0
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}
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activate_vg()
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{
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# Sanity checks
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if [ ! -x /sbin/lvm ]; then
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message "cryptsetup ($crypttarget): lvm is not available"
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return 1
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fi
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# Detect and activate available volume groups
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/sbin/lvm vgscan
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/sbin/lvm vgchange -a y --sysinit
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return $?
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}
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setup_mapping()
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{
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local opts count cryptopen cryptremove NEWROOT
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opts="$1"
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if [ -z "$opts" ]; then
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return 0
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fi
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parse_options "$opts" || return 1
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# Wait for USB to settle
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/bin/sleep 3
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if [ -z "$cryptkeyscript" ]; then
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# Test all devices
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mkdir -p /tmp/mnt
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echo "Searching for cryptkey.txt on available disks... "
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for partition in `cat /proc/partitions |awk '{print $4}'|tail -n +3`; do
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echo Trying /dev/$partition
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if mount /dev/$partition /tmp/mnt 2>/dev/null; then
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if cat /tmp/mnt/cryptkey.txt >> /tmp/cryptkeys.txt 2>/dev/null; then
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echo "Found keys on /dev/$partition"
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fi
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umount /dev/$partition
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fi
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done
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echo "Done searching."
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if [ ${cryptsource#/dev/disk/by-uuid/} != $cryptsource ]; then
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# UUIDs are not very helpful
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diskname="$crypttarget"
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else
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diskname="$cryptsource ($crypttarget)"
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fi
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cryptkeyscript="/lib/cryptsetup/askpass"
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cryptkey="Please unlock disk $diskname: "
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elif ! type "$cryptkeyscript" >/dev/null; then
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message "cryptsetup ($crypttarget): error - script \"$cryptkeyscript\" missing"
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return 1
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fi
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if [ "$cryptkeyscript" = "cat" ] && [ "${cryptkey#/root/}" != "$cryptkey" ]; then
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# skip the mapping if the root FS is not mounted yet
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sed -rn 's/^\s*[^#]\S*\s+(\S+)\s.*/\1/p' /proc/mounts | grep -Fxq "$rootmnt" || return 1
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# substitute the "/root" prefix by the real root FS mountpoint otherwise
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cryptkey="${rootmnt}/${cryptkey#/root/}"
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fi
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if [ -n "$cryptheader" ] && ! type "$cryptheader" >/dev/null; then
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message "cryptsetup ($crypttarget): error - LUKS header \"$cryptheader\" missing"
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return 1
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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 [ -e "/dev/mapper/$crypttarget" ]; then
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return 0
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fi
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modprobe -q dm_crypt
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# Make sure the cryptsource device is available
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if [ ! -e $cryptsource ]; then
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activate_vg
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fi
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# If the encrypted source device hasn't shown up yet, give it a
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# little while to deal with removable devices
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# the following lines below have been taken from
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# /usr/share/initramfs-tools/scripts/local, as suggested per
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# https://launchpad.net/bugs/164044
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if [ ! -e "$cryptsource" ]; then
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log_begin_msg "Waiting for encrypted source device..."
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# Default delay is 180s
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if [ -z "${ROOTDELAY}" ]; then
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slumber=180
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else
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slumber=${ROOTDELAY}
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fi
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slumber=$(( ${slumber} * 10 ))
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while [ ! -e "$cryptsource" ]; do
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# retry for LVM devices every 10 seconds
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if [ ${slumber} -eq $(( ${slumber}/100*100 )) ]; then
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activate_vg
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fi
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/bin/sleep 0.1
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slumber=$(( ${slumber} - 1 ))
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[ ${slumber} -gt 0 ] || break
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done
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if [ ${slumber} -gt 0 ]; then
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log_end_msg 0
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else
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log_end_msg 1 || true
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fi
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fi
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udev_settle
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# We've given up, but we'll let the user fix matters if they can
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if [ ! -e "${cryptsource}" ]; then
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echo " ALERT! ${cryptsource} does not exist."
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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 -r "Dropping to a shell. Will skip ${cryptsource} if you can't fix."
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fi
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if [ ! -e "${cryptsource}" ]; then
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return 1
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fi
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# Prepare commands
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cryptopen="/sbin/cryptsetup -T 1"
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if [ "$cryptdiscard" = "yes" ]; then
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cryptopen="$cryptopen --allow-discards"
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fi
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if [ -n "$cryptheader" ]; then
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cryptopen="$cryptopen --header=$cryptheader"
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fi
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if [ -n "$cryptkeyslot" ]; then
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cryptopen="$cryptopen --key-slot=$cryptkeyslot"
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fi
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if /sbin/cryptsetup isLuks ${cryptheader:-$cryptsource} >/dev/null 2>&1; then
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cryptopen="$cryptopen open --type luks $cryptsource $crypttarget --key-file=-"
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elif [ "$crypttcrypt" = "yes" ]; then
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cryptopen="$cryptopen open --type tcrypt $cryptveracrypt $cryptsource $crypttarget"
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else
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cryptopen="$cryptopen -c $cryptcipher -s $cryptsize -h $crypthash open --type plain $cryptsource $crypttarget --key-file=-"
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fi
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cryptremove="/sbin/cryptsetup remove $crypttarget"
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NEWROOT="/dev/mapper/$crypttarget"
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# Try to get a satisfactory password $crypttries times
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count=0
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while [ $crypttries -le 0 ] || [ $count -lt $crypttries ]; do
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export CRYPTTAB_TRIED="$count"
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count=$(( $count + 1 ))
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if [ ! -e "$NEWROOT" ]; then
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keyfound=0
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if [ -e /tmp/cryptkeys.txt ] ; then
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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 crypttarget="$crypttarget" cryptsource="$cryptsource" \
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echo -n "$key" | $cryptopen; then
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# Found the key
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echo Key found in cryptkey.txt
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keyfound=1
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key=""
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fi
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done
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# Remove traces of the key
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rm /tmp/cryptkeys.txt
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unset key
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fi
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echo Keyfound = "$keyfound"
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if [ "$keyfound" = "0" ]; then
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# Fall back to manual entry
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if ! crypttarget="$crypttarget" cryptsource="$cryptsource" \
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$cryptkeyscript "$cryptkey" | $cryptopen; then
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message "cryptsetup ($crypttarget): cryptsetup failed, bad password or options?"
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continue
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fi
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fi
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fi
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if [ ! -e "$NEWROOT" ]; then
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message "cryptsetup ($crypttarget): unknown error setting up device mapping"
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return 1
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fi
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#FSTYPE=''
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#eval $(fstype < "$NEWROOT")
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FSTYPE="$(/sbin/blkid -s TYPE -o value "$NEWROOT")"
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# See if we need to setup lvm on the crypto device
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#if [ "$FSTYPE" = "lvm" ] || [ "$FSTYPE" = "lvm2" ]; then
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if [ "$FSTYPE" = "LVM_member" ] || [ "$FSTYPE" = "LVM2_member" ]; then
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if [ -z "$cryptlvm" ]; then
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message "cryptsetup ($crypttarget): lvm fs found but no lvm configured"
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return 1
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elif ! activate_vg; then
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# disable error message, LP: #151532
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#message "cryptsetup ($crypttarget): failed to setup lvm device"
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return 1
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fi
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# Apparently ROOT is already set in /conf/param.conf for
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# flashed kernels at least. See bugreport #759720.
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if [ -f /conf/param.conf ] && grep -q "^ROOT=" /conf/param.conf; then
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NEWROOT=$(sed -n 's/^ROOT=//p' /conf/param.conf)
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else
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NEWROOT=${cmdline_root:-/dev/mapper/$cryptlvm}
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if [ "$cryptrootdev" = "yes" ]; then
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# required for lilo to find the root device
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echo "ROOT=$NEWROOT" >>/conf/param.conf
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fi
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fi
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#eval $(fstype < "$NEWROOT")
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FSTYPE="$(/sbin/blkid -s TYPE -o value "$NEWROOT")"
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fi
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#if [ -z "$FSTYPE" ] || [ "$FSTYPE" = "unknown" ]; then
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if [ -z "$FSTYPE" ]; then
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message "cryptsetup ($crypttarget): unknown fstype, bad password or options?"
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udev_settle
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$cryptremove
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continue
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fi
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# decrease $count by 1, apparently last try was successful.
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count=$(( $count - 1 ))
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message "cryptsetup ($crypttarget): set up successfully"
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break
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done
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failsleep=60 # make configurable later?
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if [ "$cryptrootdev" = "yes" ] && [ $crypttries -gt 0 ] && [ $count -ge $crypttries ]; then
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message "cryptsetup ($crypttarget): maximum number of tries exceeded"
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message "cryptsetup: going to sleep for $failsleep seconds..."
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sleep $failsleep
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exit 1
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fi
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udev_settle
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return 0
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}
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#
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# Begin real processing
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#
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# Do we have any kernel boot arguments?
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cmdline_cryptopts=''
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unset cmdline_root
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for opt in $(cat /proc/cmdline); do
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case $opt in
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cryptopts=*)
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opt="${opt#cryptopts=}"
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if [ -n "$opt" ]; then
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if [ -n "$cmdline_cryptopts" ]; then
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cmdline_cryptopts="$cmdline_cryptopts $opt"
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else
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cmdline_cryptopts="$opt"
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fi
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fi
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;;
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root=*)
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opt="${opt#root=}"
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case $opt in
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/*) # Absolute path given. Not lilo major/minor number.
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cmdline_root=$opt
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;;
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*) # lilo major/minor number (See #398957). Ignore
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esac
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;;
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esac
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done
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if [ -n "$cmdline_cryptopts" ]; then
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# Call setup_mapping separately for each possible cryptopts= setting
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for cryptopt in $cmdline_cryptopts; do
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setup_mapping "$cryptopt"
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done
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exit 0
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fi
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# Do we have any settings from the /conf/conf.d/cryptroot file?
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if [ -r /conf/conf.d/cryptroot ]; then
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while read mapping <&3; do
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setup_mapping "$mapping" 3<&-
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done 3< /conf/conf.d/cryptroot
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fi
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exit 0
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