342 lines
11 KiB
Bash
342 lines
11 KiB
Bash
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#!/bin/sh
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#
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# Copyright (c) 02005 sense.lab <senselab@systemausfall.org>
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#
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# License: This script is distributed under the terms of version 2
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# of the GNU GPL. See the LICENSE file included with the package.
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#
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# $Id$
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#
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# this script is responsible for all dangerous actions, that require root privileges
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# every action should be checked at least TWICE a day for open holes :)
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# usually will get call via sudo
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#
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# called by:
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# - cbox-manage.sh
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#
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set -eu
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LIB_DIR=$(dirname "$0")
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LIB_DIR=$(cd "$LIB_DIR"; pwd)
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test "$(id -u)" -ne 0 && echo "$(basename $0) - only root may call this script" >&2 && exit 100
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# read the default setting file, if it exists
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test -e /etc/default/cryptobox && . /etc/default/cryptobox
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# set CONF_FILE to default value, if not configured in /etc/default/cryptobox
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CONF_FILE=${CONF_FILE:-/etc/cryptobox/cryptobox.conf}
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# parse config file
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. "$CONF_FILE"
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# parse distribution specific file
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. "$DISTRIBUTION_CONF"
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CB_SCRIPT="$LIB_DIR/cbox-manage.sh"
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CONFIG_MARKER=cryptobox.marker
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############ some useful functions ###############
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# check if the given device is part of the SCAN_DEVICE list
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# every entry in SCAN_DEVICES is matched as "^/dev/${SCAN_DEVICE}[^/]*$" against
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# the given device
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# other devices may not be touched
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function is_device_allowed()
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# parameter: device
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{
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for a in $SCAN_DEVICES
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do echo "$1" | grep -q "^/dev/${a}[^/]*$" && return 0
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done
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return 1
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}
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# return the uuid of the partition (if possible)
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# this works at least for luks, ext2/3 and vfat partitions
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function get_device_uuid() {
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local UUID
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# check for luksUUID or ext2/3-uuid
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if is_luks_device "$1"
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then UUID=$("$CRYPTSETUP" luksUUID "$1")
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else test -x "$BLKID" && UUID=$("$BLKID" -s UUID -o value -c /dev/null -w /dev/null "$1" 2>/dev/null)
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fi
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if test -z "$UUID"
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then get_device_flat_name "$1"
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else echo "$UUID"
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fi
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return 0
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}
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# the device name is "flattened"
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function get_device_flat_name() {
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echo "$1" | sed 's#/#_#g'
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}
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# the basename of the mountpoint for this device - should be somehow human_readable
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function get_device_mnt_name() {
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"$CB_SCRIPT" get_device_name "$1"
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}
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# every devmapper name should look like a UUID
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function is_uuid_valid() {
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local hex=[0-9a-f]
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echo "$1" | grep -q "^$hex\{8\}-$hex\{4\}-$hex\{4\}-$hex\{4\}-$hex\{12\}$"
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}
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# parameter ExitCode ErrorMessage
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function error_msg() {
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echo "CBOX-ERROR: [$(basename $0) - $ACTION] - $2" >&2
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exit $1
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}
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# parameter: device sfdisk_layout_setup
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# e.g.: /dev/hda "0,1,L \n,,L\n"
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function partition_device() {
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# TODO: allow different layouts
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# TODO: skip config partition if a configuration is already active
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# sfdisk -n doesn't actually write (for testing purpose)
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if echo -e "$2" | "$SFDISK" -n "$1"
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then echo -e "$2" | "$SFDISK" "$1" || return 1
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else return 2
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fi
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true
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}
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function is_luks_device()
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# parameter: device
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{
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"$CRYPTSETUP" isLuks "$1" 2>/dev/null
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}
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################ main ####################
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ACTION=unknown
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test $# -gt 0 && ACTION=$1 && shift
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case "$ACTION" in
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partition_disk )
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test $# -ne 2 && error_msg 1 "wrong number of parameters"
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is_device_allowed "$1" || \
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error_msg 3 "this device ($1) is not listed in SCAN_DEVICES (see $CONF_FILE)"
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partition_device "$1" "$2" || \
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error_msg 2 "failed to create new partition table on device $1"
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;;
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mount )
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# parameters: device
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# returns the relative name of the mointpoint for success
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test $# -ne 1 && error_msg 1 "wrong number of parameters"
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is_device_allowed "$1" || \
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error_msg 3 "this device ($1) is not listed in SCAN_DEVICES (see $CONF_FILE)"
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mnt_name=$(get_device_mnt_name "$1")
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mountpoint -q "$MNT_PARENT/$mnt_name" && \
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error_msg 5 "a device with the same name ($mnt_name) is already mounted"
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mkdir -p "$MNT_PARENT/$mnt_name"
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if is_luks_device "$1"
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then "$CRYPTSETUP" luksOpen "$1" "$mnt_name" || \
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error_msg 6 "could not open encrypted device $1"
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if mount "$DEV_MAPPER_DIR/$mnt_name" "$MNT_PARENT/$mnt_name"
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then true
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else "$CRYPTSETUP" luksClose "$mnt_name" || true
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error_msg 7 "wrong password for $1 supplied"
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fi
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else mount "$1" "$MNT_PARENT/$mnt_name" || \
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error_msg 8 "invalid filesystem on device $1"
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fi
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# just in case, that there is no ext2/3 filesystem:
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# set uid option (will fail silently for ext2/3)
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# TODO: there is no FILE_USER setting anymore - do we still need it?
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#mount -o remount,uid="$FILE_USER" "$MNT_PARENT/$name" 2>/dev/null || true
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# adapt top-level permission to current setup - again: may fail silently
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#chown "$FILE_USER" "$MNT_PARENT/$name" 2>/dev/null || true
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true
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;;
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umount )
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#parameter: device
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test $# -ne 1 && error_msg 1 "wrong number of parameters"
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is_device_allowed "$1" || \
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error_msg 3 "this device ($1) is not listed in SCAN_DEVICES (see $CONF_FILE)"
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mnt_name=$(get_device_mnt_name "$1")
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mountpoint -q "$MNT_PARENT/$mnt_name" || \
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error_msg 9 "the device ($1) is not mounted as '$mnt_name'"
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# try to unmount - do it in lazy mode
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umount -l "$MNT_PARENT/$mnt_name"
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# TODO: check, what happens, if there are open files - does the device gets mapping removed?
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# remove (if necessary) the device mapping
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if test -e "$DEV_MAPPER_DIR/$mnt_name"
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then "$CRYPTSETUP" luksClose "$mnt_name" || \
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error_msg 11 "could not remove the device mapper ($mnt_name) for device $1"
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fi
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# try to remove the mountpoint - a failure is not important
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rmdir "$MNT_PARENT/$mnt_name" || true
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# set exitcode
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mountpoint -q "$MNT_PARENT/$mnt_name" && exit 1
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true
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;;
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create_crypto )
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# parameter: device keyfile
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test $# -ne 2 && error_msg 1 "wrong number of parameters"
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keyfile=$2
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test -e "$keyfile" || error_msg 2 "keyfile ($keyfile) not found"
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is_device_allowed "$1" || \
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error_msg 3 "this device ($1) is not listed in SCAN_DEVICES (see $CONF_FILE)"
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# read the passphrase from stdin
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# the iter-time is in milliseconds - keep it low for fast mounting
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cat "$keyfile" | \
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"$CRYPTSETUP" --cipher "$DEFAULT_CIPHER" --iter-time 2000 --batch-mode luksFormat "$1" || \
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error_msg 11 "failed to create the encrypted partition"
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name=$(get_device_mnt_name "$1")
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cat "$keyfile" | "$CRYPTSETUP" --batch-mode luksOpen "$1" "$name" || \
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error_msg 12 "failed to open the encrypted partition"
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# trash the passphrase in keyfile
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echo "0123456789abcdefghijklmnopqrstuvwxyz" > "$keyfile"
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# the disk cache surely prevents the previous line from being written, but we do it anyway ...
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echo "zyxwvutsrqponmlkjihgfedcba9876543210" > "$keyfile"
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rm "$keyfile"
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# complete in background
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(
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"$MKFS_DATA" "$DEV_MAPPER_DIR/$name" || \
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error_msg 13 "failed to create the encrypted filesystem"
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"$CRYPTSETUP" --batch-mode luksClose "$name" || \
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error_msg 14 "failed to close the encrypted mapped device"
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) </dev/null >/dev/null 2>/dev/null &
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true
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;;
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create_plain )
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# parameter: device
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test $# -ne 1 && error_msg 1 "wrong number of parameters for 'create_plain'"
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is_device_allowed "$1" || \
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error_msg 3 "this device ($1) is not listed in SCAN_DEVICES (see $CONF_FILE)"
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# complete in background
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(
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"$MKFS_DATA" "$1" || \
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error_msg 15 "failed to create the plaintext filesystem"
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) </dev/null >/dev/null 2>/dev/null &
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true
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;;
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get_device_mnt_name )
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# parameter: device
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test $# -ne 1 && error_msg 1 "wrong number of parameters"
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is_device_allowed "$1" || \
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error_msg 3 "this device ($1) is not listed in SCAN_DEVICES (see $CONF_FILE)"
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get_device_mnt_name "$1"
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;;
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get_device_uuid )
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# parameter: device
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test $# -ne 1 && error_msg 1 "wrong number of parameters"
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is_device_allowed "$1" || \
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error_msg 3 "this device ($1) is not listed in SCAN_DEVICES (see $CONF_FILE)"
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get_device_uuid "$1"
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;;
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is_config_partition )
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# parameter: device
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# returns exitcode 0 if the device contains a configuration
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test $# -ne 1 && error_msg 1 "wrong number of parameters"
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is_device_allowed "$1" || \
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error_msg 3 "this device ($1) is not listed in SCAN_DEVICES (see $CONF_FILE)"
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is_config=0
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tmp_dir=/tmp/$(basename $0)-$$-mnt
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mkdir -p "$tmp_dir"
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# error means "no config partition"
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if mount "$1" "$CONFIG_DIR"
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then test -e "$CONFIG_DIR/$CONFIG_MARKER" && is_config=1
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umount "$CONFIG_DIR" || \
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error_msg 14 "unable to unmount configation partition after probing"
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fi
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rmdir "$tmp_dir" || true
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# return 0 if $device is a config partition
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test "$is_config" -eq 1 && exit 0
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exit 1
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;;
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is_crypto_partition )
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# parameter: device
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# returns exitcode 0 if the device contains a luks header
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test $# -ne 1 && error_msg 1 "wrong number of parameters"
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is_device_allowed "$1" || \
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error_msg 3 "this device ($1) is not listed in SCAN_DEVICES (see $CONF_FILE)"
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is_luks_device "$1"
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;;
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is_plain_partition )
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# parameter: device
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# returns exitcode 0 if the device contains a readable filesystem
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test $# -ne 1 && error_msg 1 "wrong number of parameters"
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is_device_allowed "$1" || \
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error_msg 3 "this device ($1) is not listed in SCAN_DEVICES (see $CONF_FILE)"
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status=0
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tmp_dir=/tmp/$(basename $0)-$$-mnt
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mkdir -p "$tmp_dir"
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if mount "$1" "$tmp_dir" >/dev/null 2>/dev/null
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then test ! -e "$tmp_dir/$CONFIG_MARKER" && status=1
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umount "$tmp_dir"
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fi
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rmdir "$tmp_dir" || true
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test "$status" -eq 1 && exit 0
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exit 1
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;;
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trash_device )
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# parameter: device
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test $# -ne 1 && error_msg 1 "wrong number of parameters"
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is_device_allowed "$1" || \
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error_msg 3 "this device ($1) is not listed in SCAN_DEVICES (see $CONF_FILE)"
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dd if=/dev/urandom of="$1" bs=512 count=1 2>/dev/null
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;;
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diskinfo )
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# parameter: device
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test $# -ne 1 && error_msg 1 "wrong number of parameters"
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is_device_allowed "$1" || \
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error_msg 3 "this device ($1) is not listed in SCAN_DEVICES (see $CONF_FILE)"
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"$SFDISK" -L -q -l "$1"
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;;
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update_network )
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# parameter: none
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ip=
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# TODO: can we avoid to hard-code the filename ($CONFIG_DIR/ip) here?
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test -e "$CONFIG_DIR/ip" && ip=$(<"$CONFIG_DIR/ip")
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test -n "$z" && ifconfig "$NET_IFACE" "$ip"
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;;
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poweroff )
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# TODO: check configuration setting before
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"$POWEROFF"
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;;
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reboot )
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# TODO: check configuration setting before
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"$REBOOT"
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;;
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* )
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echo "[$(basename $0)] - unknown action: $ACTION" >&2
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echo "Syntax: $(basename $0) ACTION PARAMETERS"
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echo ' partition_disk $device $disk_layout'
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echo ' get_device_name $device'
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echo ' get_device_uuid $device'
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echo ' create_crypto $device'
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echo ' mount $device'
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echo ' umount $name'
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echo ' create_config $device'
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echo ' mount_config $device'
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echo ' remount_config { ro | rw }'
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echo ' umount_config'
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echo ' is_config_partition $device'
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echo ' is_plain_partition $device'
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echo ' is_crypto_partition $device'
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echo ' trash_device $device'
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echo ' diskinfo $device'
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echo ' update_network'
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echo ' poweroff'
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echo ' reboot'
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echo ' help'
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echo
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test "$ACTION" = "help" && exit 0
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# return error for any unknown/unspecified action
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exit 1
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;;
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esac
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