Adding example hook from Rui Miguel Bernardo <rui.bernardo.pt@gmail.com> to use home on a seperated luks encrypted partition.

1 files changed, 411 insertions, 0 deletions

diff --git a/examples/hooks/losetup-lukshome.sh b/examples/hooks/losetup-lukshome.sh
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+++ b/examples/hooks/losetup-lukshome.sh
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+#!/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 regularly the data on the encrypted file or the
+# disk image file itself (luks-home.img) to prevent loosing 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 present in
+# 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.
+#
+# Boot your live system normally and run as root or with sudo:
+#
+#	sudo -i
+#	create-lukshome-file.sh
+#	# the script is located in /usr/local/sbin/, so it's in root $PATH.
+#
+# This script will create the disk file image with an encrypted filesystem for you.
+#
+# Then copy the file to a partition (on USB pen or harddisk) and label that partition with
+# lukshome.
+#
+####### THIS CAN WIPE YOUR DATA, backup first!
+####### Be sure to understand what you will do, or you can end up
+####### wiping disks or partitions you don't want to.
+#
+#	# Here we are using ext2 (no journaling), but any partition
+#	# format that Debian Live *can* mount *should* work.
+#	# The partition labeled lukshome is very important!
+#	mkfs.ext2 -L lukshome /dev/the_partition_to_be_used
+#	mount /dev/the_partition_to_be_used /mnt
+#	cp luks-home.img /mnt
+#	umount /mnt
+#
+# Reboot and now use the lukshome boot option to mount the encrypted /home, like in
+# persistent=nofiles with a home-rw file/partition.
+#
+
+
+
+echo "I: creating script /usr/local/sbin/create-lukshome-file.sh"
+cat > /usr/local/sbin/create-lukshome-file.sh << 'EOF'
+#!/bin/sh
+
+# Script to create an encrypted filesystem in a disk file image to
+# be used in a Debian Live Helper built live system with lukshome hook.
+
+# check if root/sudo
+if [ "${USER}" != "root" ]
+then
+	echo " ** Please run this script as root or with sudo."
+	echo ""
+	exit 1
+fi
+
+# check if /mnt is available
+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
+
+# 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
+
+# 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."
+echo "** Filling file image with /dev/urandom output. It will take some time."
+echo "(Please change this script to use /dev/random instead. It's more secure but will take a *very* long time to complete."
+dd if=/dev/urandom of=luks-home.img bs=1M count=${FILE_SIZE}
+echo "** Done."
+echo ""
+
+# losetup
+FREE_LOSETUP=$(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 ${FREE_LOSETUP}
+ERROR_LEVEL=${?}
+if [ "${ERROR_LEVEL}" != 0 ]
+then
+	echo "** ERROR: Error while trying to format disk file image."
+	losetup -d ${FREE_LOSETUP}
+	exit 1
+fi
+echo ""
+
+echo "** luksOpen"
+cryptsetup luksOpen ${FREE_LOSETUP} luks-home
+ERROR_LEVEL=${?}
+if [ "${ERROR_LEVEL}" != 0 ]
+then
+	echo "** ERROR: Error while trying to open LUKS file image."
+	losetup -d ${FREE_LOSETUP}
+	exit 1
+fi
+echo ""
+
+# format encrypted filesystem
+echo "** Now formating /dev/mapper/luks-home"
+mkfs.ext2 /dev/mapper/luks-home
+ERROR_LEVEL=${?}
+if [ "${ERROR_LEVEL}" != 0 ]
+then
+	echo "** ERROR: Error while trying to format LUKS file."
+	losetup -d ${FREE_LOSETUP}
+	exit 1
+fi
+echo ""
+
+# mount in /mnt
+echo "** Now mounting luks-home.img in /mnt"
+mount /dev/mapper/luks-home /mnt
+ERROR_LEVEL=${?}
+if [ "${ERROR_LEVEL}" != 0 ]
+then
+	echo "** ERROR: Error while trying to mount LUKS file in /mnt."
+	umount /mnt
+	losetup -d ${FREE_LOSETUP}
+	exit 1
+fi
+echo ""
+
+# copy files
+echo "** To copy the actual /home/* directory to the encrypted disk image filesystem, press ENTER and"
+echo "** answer -> Y <- when asked to confirm."
+echo ""
+echo "** If using an other external /home partition be aware that UID and username must match with the ones used by the live system."
+echo "** If you don't want to copy anything now, just press ENTER twice. No copying will be done, file will be an empty encrypted ext2 filesystem."
+echo "** Later, after this script ends, use losetup, cryptsetup, mount and chown to copy manually the files/directory you want."
+echo ""
+echo "** Please type the location of /home directories to be copied."
+echo "Where are the directiories you want to copy? [/home/*]"
+read HOME_DIR
+
+if [ -z "${HOME_DIR}" ]
+then
+	HOME_DIR="/home/*"
+fi
+
+echo "** Please confirm. Press ENTER if you don't want any file to be copied now."
+echo "Copy directories and files from "${HOME_DIR}"? (y/N)"
+read CONFIRM_COPY
+
+case "${CONFIRM_COPY}" in
+	y*|Y*)
+		echo "** Copying from ${HOME_DIR}."
+		cp -rav ${HOME_DIR} /mnt
+		ERROR_LEVEL=${?}
+		if [ "${ERROR_LEVEL}" != 0 ]
+		then
+			echo "** ERROR: Error while trying to copy files to /mnt."
+			umount /mnt
+			losetup -d ${FREE_LOSETUP}
+			exit 1
+		fi
+		echo "** Done."
+		echo ""
+	;;
+	*)
+		echo "Not copying anything."
+		echo ""
+	;;
+esac
+
+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."
+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 executed by a hook in live-initramfs. It searches
+# for an ext2 partition with lukshome label, mounts loop file and saves location
+# in /etc/live.conf. It also creates a script in /etc/init.d/ for umounting /home 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."
+	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 "Mounting /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	${FREE_LOOP}	none	luks,check,timeout" >> /etc/crypttab
+
+	# update fstab
+	echo "/dev/mapper/home	/home	ext2	defaults,noatime	0	0" >> /etc/fstab
+fi
+
+# changes to /etc/init.d/umountfs to make /luks-home been umounted too
+sed -i 's/[\t]do_stop/CHANGE_HERE/' /etc/init.d/umountfs
+sed -i 's|CHANGE_HERE|	\
+	# added by lukshome hook -  umount \/luks-home to prevent busy device on shutdown \
+	LOOP_LUKSHOME=$(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 add the lukshome partition to crypttab and fstab
+
+log_begin_msg "Executing losetup-lukshome"
+
+# get boot option lukshome without persistent- 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 will be used instead."
+	log_end_msg
+	exit 0
+fi
+
+# if no lukshome boot option, exit
+if [ -z "${LUKSHOME}" ]
+then
+	echo "Nothing to do."
+	log_end_msg
+	exit 0
+fi
+
+log_begin_msg "Executing lukshome.sh script."
+
+mount -o bind /sys /root/sys
+mount -o bind /proc /root/proc
+mount -o bind /dev /root/dev
+
+# lukshome.sh detects lukshome partition and file location, mounts it
+# and updates fstab and crypttab.
+chroot /root /usr/local/sbin/lukshome.sh
+
+umount /root/sys
+umount /root/proc
+umount /root/dev
+
+# delete the lukshome scripts, not needed anymore
+# rm -f /root/usr/local/sbin/lukshome.sh
+# rm -f /root/usr/local/sbin/create-lukshome-file.sh
+
+log_end_msg
+
+EOF
+
+chmod 0755 /usr/share/initramfs-tools/scripts/live-bottom/13live_luks_home
+
+
+
+echo "I: update-initramfs to include 13live_luks_home."
+# if you already have installed the update-initramfs.sh hook, you can remove this.
+
+for KERNEL in /boot/vmlinuz-*
+do
+	VERSION="$(basename ${KERNEL} | sed -e 's|vmlinuz-||')"
+
+	update-initramfs -k ${VERSION} -t -u
+done