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Diffstat (limited to 'examples/hooks/all_chroot_losetup-lukshome.sh')
-rwxr-xr-x | examples/hooks/all_chroot_losetup-lukshome.sh | 460 |
1 files changed, 460 insertions, 0 deletions
diff --git a/examples/hooks/all_chroot_losetup-lukshome.sh b/examples/hooks/all_chroot_losetup-lukshome.sh new file mode 100755 index 000000000..55424383c --- /dev/null +++ b/examples/hooks/all_chroot_losetup-lukshome.sh @@ -0,0 +1,460 @@ +#!/bin/sh + +# This hook was based and adapted from: +# http://lists.debian.org/debian-live/2009/04/msg00186.html +# --------------------------------------------------------- +# +# +# NOTE 1: this was not tested with persistent boot option, +# but it seems logic that persistent and lukshome can't +# coexist as boot options (because of snapshots and others), so lukshome +# won't be executed if any persistent option is given on boot. +# +# NOTE 2: if using an USB key, it will eventualy end up failing someday. +# You should backup the encrypted disk image file itself (luks-home.img) to +# prevent loosing your data. +# +# This hook will create 3 files: +# +# /usr/local/sbin/create-lukshome-file.sh +# script to create an disk file image (luks-home.img) with a +# LUKS encrypted ext2 filesystem inside to be placed in a +# partition labeled lukshome. +# +# /usr/local/sbin/lukshome.sh +# detects a partition with lukshome label, updates fstab and crypttab so +# the encrypted file is mounted later in a loopback device (/dev/loopX). +# It also changes /etc/init.d/umountfs so the encrypted home is correctly +# umounted. +# +# /usr/share/initramfs-tools/scripts/live-bottom/13live_luks_home +# a live-initramfs hook to execute lukshome.sh script +# in initrd. +# +# +# HOWTO lukshome +# -------------- +# +# First build your live system with this hook inside config/chroot_local-hooks/. +# If you have an existing live-helper build directory with a previous live +# build, you might have to run +# +# lh_clean +# lh_clean --stage +# +# to make sure this hook is included in the live system. Then (re)build your +# live system. +# +# lh_build +# +# After booting your (re)built live system, setup the encrypted losetup +# filesystem to be used as /home using the instructions present in the +# create-lukshome-file.sh script. +# +# Reboot and now use the "lukshome" boot option to mount the encrypted /home, +# like in using "persistent" boot option with a home-rw file in some partition. +# + + +echo "I: to see how use lukshome hook run create-lukshome-file.sh as root." +echo "I: creating script /usr/local/sbin/create-lukshome-file.sh" +cat > /usr/local/sbin/create-lukshome-file.sh << 'EOF' +#!/bin/sh + +# This script is to create an encrypted filesystem in a file to +# be used as /home in a live system built with Debian Live Helper with +# the lukshome hook in config/chroot_local-hooks/. +# +# The lukshome boot option will do the following: +# - search for a partition with label 'lukshome' +# (btw, you can't use the live system partition itself) +# - mount the partition as /luks-home in the live system +# - open /luks-home/luks-home.img file as a loopback device (/dev/loop) +# - open the loopback device with cryptsetup +# - mount the encrypted filesystem as /home +# +# This script will only create the luks-home.img file. Next are details of how +# to use this script. +# +# CAUTION! THIS CAN WIPE YOUR DATA, backup first! +# Be sure to understand what you will do, or you can end up +# wiping disks or partitions you don't want to! +# +# Login as root: +# $ sudo -i +# +# Create a mountpoint (don't use /mnt, it will be used by this script): +# # mkdir /media/target +# +# !!! *** Skip the next line if you don't want to wipe a partition *** !!! +# !!! * Just change the partition label to 'lukshome' (without quotes) * !!! +# Create an ext2 filesystem in a partition with 'lukshome' label: +# # mkfs.ext2 -L lukshome /dev/the_partition_to_be_used +# +# Mount the partition and cd into it: +# # mount /dev/the_partition_to_be_used /media/target +# # cd /media/target +# +# Create the encrypted file: +# # create-lukshome-file.sh +# +# The script is located in /usr/local/sbin/, so it's in root $PATH. +# It will copy the directories in /home/* into the file. +# Now return to $HOME to be able to umount the target partition: +# # cd +# +# Umount the target partition: +# # umount /media/target +# +# Reboot and use the "lukshome" boot option to mount the encrypted /home, +# like in using "persistent" boot option with a home-rw file in some partition. +# +# Press Shift-PgUp/Shift-PgDn to scrool the instructions on the screen. + + +# check if root/sudo +if [ "${USER}" != "root" ] +then + echo " ** Please run this script as root or with sudo." + exit 1 +fi + +# check if /mnt is available and empty +mount | grep "/mnt" > /dev/null +MNT_IS_MOUNTED=${?} +if [ "${MNT_IS_MOUNTED}" == 0 ] +then + echo "** ERROR: /mnt is mounted at the moment. Please umount it to use this script." + exit 1 +fi +if [ "$(ls -A /mnt)" ] +then + echo "** ERROR: /mnt is not empty. An empty /mnt is needed to use this script." + exit 1 +fi + +# check if /dev/mapper/luks-home is available +if [ -f /dev/mapper/luks-home ] +then + echo "** ERROR: /dev/mapper/luks-home is being used at the moment. Please run «cryptsetup remove luks-home» to use this script." + exit 1 +fi + + +# show instructions +echo "" +echo "** Instructions to use create-lukshome-file.sh (this script):" +sed -n '2,51p' /usr/local/sbin/create-lukshome-file.sh | sed 's/^.//' +echo "" + + +# proceed? +echo "** Do you want to proceed with this script? (y/N)" +read CONFIRM + +case "${CONFIRM}" in + y*|Y*) + echo "" + ;; + *) + exit 0 + ;; +esac + + +# create file +echo "" +echo "** Please type the size of the file disk image." +echo "Size of the file in MB: " +read FILE_SIZE + +echo "" +echo "** Creating file luks-home.img." +echo "** Filling file image with /dev/urandom output. It will take some time." +echo "(Edit this script to use /dev/random. It's know to more secure but " +echo "it will take a *very* long time to complete." +dd if=/dev/urandom of=luks-home.img bs=1M count=${FILE_SIZE} +# To use /dev/random comment the line above and uncomment the next line +#dd if=/dev/random of=luks-home.img ibs=128 obs=128 count=$((8192*${FILE_SIZE})) +# You might have to increase kernel entropy by moving the mouse, typing keyboard, +# make the computer read disk or use network connections. +echo "** Done." +echo "" + +# losetup +FREE_LOSETUP=$(losetup -f) +echo "** Using ${FREE_LOSETUP} to open luks-home.img" +losetup ${FREE_LOSETUP} ./luks-home.img +echo "** Done." +echo "" + +# cryptsetup +echo "** Running cryptsetup." +echo "" +echo "** luksFormat" +cryptsetup luksFormat ${FREE_LOSETUP} +EXIT_CODE=${?} +if [ "${EXIT_CODE}" != 0 ] +then + echo "** ERROR: Error while trying to format disk file image." + losetup -d ${FREE_LOSETUP} + exit 1 +fi +echo "" + +echo "** luksOpen" +cryptsetup luksOpen ${FREE_LOSETUP} luks-home +EXIT_CODE=${?} +if [ "${EXIT_CODE}" != 0 ] +then + echo "** ERROR: Error while trying to open LUKS file image." + losetup -d ${FREE_LOSETUP} + exit 1 +fi +echo "" + +# format encrypted filesystem +echo "** Now formating /dev/mapper/luks-home" +mkfs.ext2 /dev/mapper/luks-home +EXIT_CODE=${?} +if [ "${EXIT_CODE}" != 0 ] +then + echo "** ERROR: Error while trying to format LUKS file." + cryptsetup remove luks-home + losetup -d ${FREE_LOSETUP} + exit 1 +fi +echo "" + +# mount in /mnt +echo "** Now mounting luks-home.img in /mnt" +mount /dev/mapper/luks-home /mnt +EXIT_CODE=${?} +if [ "${EXIT_CODE}" != 0 ] +then + echo "** ERROR: Error while trying to mount LUKS file in /mnt." + umount /mnt + cryptsetup remove luks-home + losetup -d ${FREE_LOSETUP} + exit 1 +fi +echo "" + +# copy files +HOME_DIR="/home/*" + +echo "** Copying ${HOME_DIR}." +cp -rav ${HOME_DIR} /mnt +EXIT_CODE=${?} +if [ "${EXIT_CODE}" != 0 ] +then + echo "** ERROR: Error while trying to copy files to /mnt." + umount /mnt + cryptsetup remove luks-home + losetup -d ${FREE_LOSETUP} + exit 1 +fi +echo "** Done." +echo "" + +echo "** All done." +echo "** Closing losetup, cryptsetup and mounted /mnt." +# umount and close +umount /mnt +cryptsetup remove luks-home +losetup -d ${FREE_LOSETUP} +echo "** The disk file image luks-home.img is done and ready. Move it into a partition" +echo "** with 'lukshome' as label and reboot with lukshome boot option to use it." +echo "" + +EOF + +chmod 0755 /usr/local/sbin/create-lukshome-file.sh + + + +echo "I: creating script /usr/local/sbin/lukshome.sh" +cat > /usr/local/sbin/lukshome.sh << 'EOF' +#!/bin/sh + +# this script is to be executed by a hook in live-initramfs. It searches +# for a partition with 'lukshome' label, mounts it as /luks-home, then opens an +# encrypted disk image file called luks-home.img as a loopback device, opens it +# with cryptsetup and finally mounts the present filesystem as /home. +# It also changes /etc/init.d/umountfs to umount the lukshome partition +# (/luks-home) and clear the loopback device on shutdown. + +# functions taken from live-helpers +. /usr/share/initramfs-tools/scripts/live-helpers + +# search for a partition labeled "lukshome" +for sysblock in $(echo /sys/block/* | tr ' ' '\n' | grep -v loop | grep -v ram | grep -v fd) +do + for dev in $(subdevices "${sysblock}") + do + devname=$(sys2dev "${dev}") + # find partition name and filesystem type + if [ "$(/lib/udev/vol_id -l ${devname} 2>/dev/null)" = "lukshome" ] + then + # found one partition named "lukshome" + CRYPTHOME="${devname}" + # don't search further + break + fi + done + # if already found, don't search further + if [ -n "${CRYPTHOME}" ] + then + break + fi +done + +# if no partition found, exit +if [ -z "${CRYPTHOME}" ] +then + echo "Could not find any partition with lukshome label. " + echo "Proceeding with no encrypted /home." + exit 0 +fi + +# mount partition where file container is +echo "Mounting /luks-home with ${CRYPTHOME}." +mkdir -p /luks-home +mount -t $(get_fstype "${CRYPTHOME}") "${CRYPTHOME}" /luks-home + +# mount losetup encrypted file +FREE_LOOP="$(/sbin/losetup -f)" +echo "Opening /luks-home/luks-home.img in ${FREE_LOOP}." + +if [ -f /luks-home/luks-home.img ] +then + /sbin/losetup ${FREE_LOOP} /luks-home/luks-home.img + + echo "Adding ${FREE_LOOP} home to /etc/crypttab and setting it as /home in /etc/fstab." + + # update crypttab + echo "home ${FREE_LOOP} none luks,check,timeout" >> /etc/crypttab + + # update fstab + echo "/dev/mapper/home /home ext2 defaults,noatime 0 0" >> /etc/fstab +else + echo "Did not found any luks-home.img file in ${CRYPTHOME}!" + echo "Proceeding with no encrypted /home." + umount -r /luks-home + exit 0 +fi + +# changes to /etc/init.d/umountfs to make /luks-home being umounted on shutdown +sed -i 's/[\t]do_stop/CHANGE_HERE/' /etc/init.d/umountfs +sed -i 's|CHANGE_HERE| \ + # added by lukshome hook - umount \/luks-home to prevent busy device on shutdown \ + LOOP_LUKSHOME=$(losetup -a \| grep luks-home \|cut -c 1-10) \ + if [ -n ${LOOP_LUKSHOME} ] \ + then \ + umount -r -d \/home \ + cryptsetup remove home \ + losetup -d ${LOOP_LUKSHOME} \ + umount -r \/luks-home \ + fi \ +\ + do_stop \ +|' /etc/init.d/umountfs + +EOF + +chmod 0755 /usr/local/sbin/lukshome.sh + + + +# scripts/live-bottom/13live_luks_home, right after 12fstab +echo "I: creating /usr/share/initramfs-tools/scripts/live-bottom/13live_luks_home" + +cat > /usr/share/initramfs-tools/scripts/live-bottom/13live_luks_home << 'EOF' +#!/bin/sh + +#set -e + +# initramfs-tools header + +PREREQ="" + +prereqs() +{ + echo "${PREREQ}" +} + +case "${1}" in + prereqs) + prereqs + exit 0 + ;; +esac + +. /scripts/live-functions + +# live-initramfs hook to use an disk image file with encrypted filesystem as /home. + +log_begin_msg "Executing losetup-lukshome" + +# get boot option lukshome - adapted from live-helpers +for ARGUMENT in $(cat /proc/cmdline) +do + case "${ARGUMENT}" in + lukshome) + LUKSHOME=1 + ;; + esac +done + +# don't use persistent* and lukshome +if [ -n "${PERSISTENT}" ] && [ -n "${LUKSHOME}" ] +then + echo "You should not use persistent and lukshome at the same time." + echo "Skipping lukshome. Persistent medium, if any, will be used instead." + log_end_msg + exit 0 +fi + +# if no lukshome boot option, exit +if [ -z "${LUKSHOME}" ] +then + log_end_msg + exit 0 +fi + +log_begin_msg "Executing lukshome.sh script." + +mount -o bind /sys /root/sys +mount -o bind /proc /root/proc +mount -o bind /dev /root/dev + +# lukshome.sh detects lukshome partition and file location, mounts it +# and opens the file and then updates fstab and crypttab to use it as /home. +chroot /root /usr/local/sbin/lukshome.sh + +umount /root/sys +umount /root/proc +umount /root/dev + +# delete the lukshome scripts, not needed anymore +# rm -f /root/usr/local/sbin/lukshome.sh +# rm -f /root/usr/local/sbin/create-lukshome-file.sh + +log_end_msg + +EOF + +chmod 0755 /usr/share/initramfs-tools/scripts/live-bottom/13live_luks_home + + + +echo "I: update-initramfs to include 13live_luks_home." +# if you already have installed the update-initramfs.sh hook, you can remove +# this. + +for KERNEL in /boot/vmlinuz-* +do + VERSION="$(basename ${KERNEL} | sed -e 's|vmlinuz-||')" + + update-initramfs -k ${VERSION} -t -u +done |