Adding example hook from Rui Miguel Bernardo <rui.bernardo.pt@gmail.com> to use home on a seperated luks encrypted partition.
This commit is contained in:
Daniel Baumann
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#!/bin/sh
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# This hook was based and adapted from:
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# http://lists.debian.org/debian-live/2009/04/msg00186.html
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# ---------------------------------------------------------
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#
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#
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# NOTE 1: this was not tested with persistent boot option,
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# but it seems logic that persistent and lukshome can't
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# coexist as boot options (because of snapshots and others), so lukshome
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# won't be executed if any persistent option is given on boot.
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#
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# NOTE 2: if using an USB key, it will eventualy end up failing someday.
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# You should backup regularly the data on the encrypted file or the
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# disk image file itself (luks-home.img) to prevent loosing data.
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#
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# This hook will create 3 files:
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#
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# /usr/local/sbin/create-lukshome-file.sh
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# script to create an disk file image (luks-home.img) with a
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# LUKS encrypted ext2 filesystem inside to be placed in a
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# partition labeled lukshome.
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#
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# /usr/local/sbin/lukshome.sh
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# detects a partition with lukshome label, updates fstab and crypttab so
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# the encrypted file is mounted later in a loopback device (/dev/loopX).
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# It also changes /etc/init.d/umountfs so the encrypted home is correctly
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# umounted.
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#
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# /usr/share/initramfs-tools/scripts/live-bottom/13live_luks_home
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# a live-initramfs hook to execute lukshome.sh script
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# in initrd.
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#
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#
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# HOWTO lukshome
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# --------------
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#
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# First build your live system with this hook present in
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# config/chroot_local-hooks/. If you have an existing live-helper build directory
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# with a previous live build, you might have to run:
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#
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# lh_clean
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# lh_clean --stage
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#
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# to make sure this hook is included in the live system. Then (re)build your live system.
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#
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# Boot your live system normally and run as root or with sudo:
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#
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# sudo -i
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# create-lukshome-file.sh
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# # the script is located in /usr/local/sbin/, so it's in root $PATH.
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#
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# This script will create the disk file image with an encrypted filesystem for you.
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#
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# Then copy the file to a partition (on USB pen or harddisk) and label that partition with
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# lukshome.
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#
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####### THIS CAN WIPE YOUR DATA, backup first!
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####### Be sure to understand what you will do, or you can end up
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####### wiping disks or partitions you don't want to.
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#
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# # Here we are using ext2 (no journaling), but any partition
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# # format that Debian Live *can* mount *should* work.
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# # The partition labeled lukshome is very important!
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# mkfs.ext2 -L lukshome /dev/the_partition_to_be_used
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# mount /dev/the_partition_to_be_used /mnt
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# cp luks-home.img /mnt
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# umount /mnt
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#
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# Reboot and now use the lukshome boot option to mount the encrypted /home, like in
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# persistent=nofiles with a home-rw file/partition.
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#
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echo "I: creating script /usr/local/sbin/create-lukshome-file.sh"
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cat > /usr/local/sbin/create-lukshome-file.sh << 'EOF'
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#!/bin/sh
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# Script to create an encrypted filesystem in a disk file image to
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# be used in a Debian Live Helper built live system with lukshome hook.
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# check if root/sudo
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if [ "${USER}" != "root" ]
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then
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echo " ** Please run this script as root or with sudo."
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echo ""
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exit 1
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fi
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# check if /mnt is available
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mount | grep "/mnt" > /dev/null
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MNT_IS_MOUNTED=${?}
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if [ "${MNT_IS_MOUNTED}" == 0 ]
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then
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echo "** ERROR: /mnt is mounted at the moment. Please umount it to use this script."
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exit 1
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fi
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# check if /dev/mapper/luks-home is available
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if [ -f /dev/mapper/luks-home ]
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then
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echo "** ERROR: /dev/mapper/luks-home is being used at the moment. Please run «cryptsetup remove luks-home» to use this script."
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exit 1
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fi
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# create file
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echo ""
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echo "** Please type the size of the file disk image."
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echo "Size of the file in MB: "
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read FILE_SIZE
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echo ""
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echo "** Creating file."
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echo "** Filling file image with /dev/urandom output. It will take some time."
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echo "(Please change this script to use /dev/random instead. It's more secure but will take a *very* long time to complete."
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dd if=/dev/urandom of=luks-home.img bs=1M count=${FILE_SIZE}
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echo "** Done."
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echo ""
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# losetup
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FREE_LOSETUP=$(losetup -f)
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echo "** Using ${FREE_LOSETUP} to open luks-home.img"
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losetup ${FREE_LOSETUP} ./luks-home.img
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echo "** Done."
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echo ""
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# cryptsetup
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echo "** Running cryptsetup."
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echo ""
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echo "** luksFormat"
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cryptsetup luksFormat ${FREE_LOSETUP}
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ERROR_LEVEL=${?}
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if [ "${ERROR_LEVEL}" != 0 ]
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then
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echo "** ERROR: Error while trying to format disk file image."
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losetup -d ${FREE_LOSETUP}
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exit 1
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fi
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echo ""
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echo "** luksOpen"
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cryptsetup luksOpen ${FREE_LOSETUP} luks-home
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ERROR_LEVEL=${?}
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if [ "${ERROR_LEVEL}" != 0 ]
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then
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echo "** ERROR: Error while trying to open LUKS file image."
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losetup -d ${FREE_LOSETUP}
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exit 1
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fi
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echo ""
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# format encrypted filesystem
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echo "** Now formating /dev/mapper/luks-home"
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mkfs.ext2 /dev/mapper/luks-home
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ERROR_LEVEL=${?}
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if [ "${ERROR_LEVEL}" != 0 ]
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then
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echo "** ERROR: Error while trying to format LUKS file."
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losetup -d ${FREE_LOSETUP}
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exit 1
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fi
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echo ""
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# mount in /mnt
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echo "** Now mounting luks-home.img in /mnt"
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mount /dev/mapper/luks-home /mnt
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ERROR_LEVEL=${?}
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if [ "${ERROR_LEVEL}" != 0 ]
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then
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echo "** ERROR: Error while trying to mount LUKS file in /mnt."
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umount /mnt
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losetup -d ${FREE_LOSETUP}
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exit 1
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fi
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echo ""
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# copy files
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echo "** To copy the actual /home/* directory to the encrypted disk image filesystem, press ENTER and"
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echo "** answer -> Y <- when asked to confirm."
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echo ""
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echo "** If using an other external /home partition be aware that UID and username must match with the ones used by the live system."
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echo "** If you don't want to copy anything now, just press ENTER twice. No copying will be done, file will be an empty encrypted ext2 filesystem."
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echo "** Later, after this script ends, use losetup, cryptsetup, mount and chown to copy manually the files/directory you want."
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echo ""
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echo "** Please type the location of /home directories to be copied."
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echo "Where are the directiories you want to copy? [/home/*]"
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read HOME_DIR
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if [ -z "${HOME_DIR}" ]
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then
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HOME_DIR="/home/*"
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fi
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echo "** Please confirm. Press ENTER if you don't want any file to be copied now."
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echo "Copy directories and files from "${HOME_DIR}"? (y/N)"
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read CONFIRM_COPY
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case "${CONFIRM_COPY}" in
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y*|Y*)
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echo "** Copying from ${HOME_DIR}."
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cp -rav ${HOME_DIR} /mnt
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ERROR_LEVEL=${?}
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if [ "${ERROR_LEVEL}" != 0 ]
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then
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echo "** ERROR: Error while trying to copy files to /mnt."
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umount /mnt
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losetup -d ${FREE_LOSETUP}
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exit 1
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fi
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echo "** Done."
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echo ""
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;;
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*)
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echo "Not copying anything."
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echo ""
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;;
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esac
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echo "** All done."
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echo "** Closing losetup, cryptsetup and mounted /mnt."
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# umount and close
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umount /mnt
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cryptsetup remove luks-home
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losetup -d ${FREE_LOSETUP}
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echo "** The disk file image luks-home.img is done and ready."
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echo ""
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EOF
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chmod 0755 /usr/local/sbin/create-lukshome-file.sh
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echo "I: creating script /usr/local/sbin/lukshome.sh"
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cat > /usr/local/sbin/lukshome.sh << 'EOF'
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#!/bin/sh
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# this script is executed by a hook in live-initramfs. It searches
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# for an ext2 partition with lukshome label, mounts loop file and saves location
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# in /etc/live.conf. It also creates a script in /etc/init.d/ for umounting /home on shutdown.
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# functions taken from live-helpers
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. /usr/share/initramfs-tools/scripts/live-helpers
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# search for a partition labeled "lukshome"
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for sysblock in $(echo /sys/block/* | tr ' ' '\n' | grep -v loop | grep -v ram | grep -v fd)
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do
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for dev in $(subdevices "${sysblock}")
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do
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devname=$(sys2dev "${dev}")
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# find partition name and filesystem type
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if [ "$(/lib/udev/vol_id -l ${devname} 2>/dev/null)" = "lukshome" ]
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then
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# found one partition named "lukshome"
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CRYPTHOME="${devname}"
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# don't search further
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break
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fi
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done
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# if already found, don't search further
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if [ -n "${CRYPTHOME}" ]
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then
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break
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fi
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done
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# if no partition found, exit
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if [ -z "${CRYPTHOME}" ]
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then
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echo "Could not find any partition with lukshome label."
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exit 0
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fi
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# mount partition where file container is
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echo "Mounting /luks-home with ${CRYPTHOME}."
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mkdir -p /luks-home
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mount -t $(get_fstype "${CRYPTHOME}") "${CRYPTHOME}" /luks-home
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# mount losetup encrypted file
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FREE_LOOP="$(/sbin/losetup -f)"
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echo "Mounting /luks-home/luks-home.img in ${FREE_LOOP}."
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if [ -f /luks-home/luks-home.img ]
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then
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/sbin/losetup ${FREE_LOOP} /luks-home/luks-home.img
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echo "Adding ${FREE_LOOP} home to /etc/crypttab and setting it as /home in /etc/fstab."
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# update crypttab
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echo "home ${FREE_LOOP} none luks,check,timeout" >> /etc/crypttab
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# update fstab
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echo "/dev/mapper/home /home ext2 defaults,noatime 0 0" >> /etc/fstab
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fi
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# changes to /etc/init.d/umountfs to make /luks-home been umounted too
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sed -i 's/[\t]do_stop/CHANGE_HERE/' /etc/init.d/umountfs
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sed -i 's|CHANGE_HERE| \
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# added by lukshome hook - umount \/luks-home to prevent busy device on shutdown \
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LOOP_LUKSHOME=$(losetup -a \| grep luks-home \|cut -c 1-10) \
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if [ -n ${LOOP_LUKSHOME} ] \
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then \
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umount -r -d \/home \
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cryptsetup remove home \
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losetup -d ${LOOP_LUKSHOME} \
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umount -r \/luks-home \
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fi \
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\
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do_stop \
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|' /etc/init.d/umountfs
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EOF
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chmod 0755 /usr/local/sbin/lukshome.sh
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# scripts/live-bottom/13live_luks_home, right after 12fstab
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echo "I: creating /usr/share/initramfs-tools/scripts/live-bottom/13live_luks_home"
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cat > /usr/share/initramfs-tools/scripts/live-bottom/13live_luks_home << 'EOF'
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#!/bin/sh
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#set -e
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# initramfs-tools header
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PREREQ=""
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prereqs()
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{
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echo "${PREREQ}"
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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/live-functions
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# live-initramfs hook to add the lukshome partition to crypttab and fstab
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log_begin_msg "Executing losetup-lukshome"
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# get boot option lukshome without persistent- adapted from live-helpers
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for ARGUMENT in $(cat /proc/cmdline)
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do
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case "${ARGUMENT}" in
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lukshome)
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LUKSHOME=1
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;;
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esac
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done
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# don't use persistent* and lukshome
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if [ -n "${PERSISTENT}" ] && [ -n "${LUKSHOME}" ]
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then
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echo "You should not use persistent and lukshome at the same time."
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echo "Skipping lukshome. Persistent medium will be used instead."
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log_end_msg
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exit 0
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fi
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# if no lukshome boot option, exit
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if [ -z "${LUKSHOME}" ]
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then
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echo "Nothing to do."
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log_end_msg
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exit 0
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fi
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log_begin_msg "Executing lukshome.sh script."
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mount -o bind /sys /root/sys
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mount -o bind /proc /root/proc
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mount -o bind /dev /root/dev
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# lukshome.sh detects lukshome partition and file location, mounts it
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# and updates fstab and crypttab.
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chroot /root /usr/local/sbin/lukshome.sh
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umount /root/sys
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umount /root/proc
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umount /root/dev
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# delete the lukshome scripts, not needed anymore
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# rm -f /root/usr/local/sbin/lukshome.sh
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# rm -f /root/usr/local/sbin/create-lukshome-file.sh
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log_end_msg
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EOF
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chmod 0755 /usr/share/initramfs-tools/scripts/live-bottom/13live_luks_home
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echo "I: update-initramfs to include 13live_luks_home."
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# if you already have installed the update-initramfs.sh hook, you can remove this.
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for KERNEL in /boot/vmlinuz-*
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do
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VERSION="$(basename ${KERNEL} | sed -e 's|vmlinuz-||')"
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update-initramfs -k ${VERSION} -t -u
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done
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