3 # Purpose: Program to format, mount and unmount encrypted devices/files
4 # Authors: Michael Gebetsroither <gebi@grml.org>
5 # Bug-Reports: see http://grml.org/bugs/
6 # License: This file is licensed under the GPL v2.
7 # Latest change: Don Jul 26 19:57:28 CEST 2007 [mika]
8 ################################################################################
15 #. /etc/grml/sysexits-sh
24 DEV_MAPPER_="/dev/mapper"
25 CRYPTSETUP_="cryptsetup"
36 DM_PREFIX_="grml-crypt_"
39 ENTROPY_SOURCE_='/dev/urandom'
40 OPTIMIZED_MODE_SET_='false'
43 CIPHER_="aes-cbc-essiv:sha256"
44 ITERATION_TIME_="1000"
45 ADDITIONAL_CRYPTSETUP_ARGS_=""
47 ADDITIONAL_MOUNT_ARGS_=""
48 BATCH_MODE_="--batch-mode"
57 Usage: "$PROG_NAME__" [OPTIONS] action <device/file> [mountpoint]
59 $PROG_NAME__ is a wrapper around cryptsetup with LUKS support to format a device
62 -s size of the loop-filesystem to create, in MB (default=$SIZE_)
63 -t type of filesystem (default=$FSTYPE_)
64 -r read only mode (fully supported only by start)
65 -z insecure mode, using /dev/zero for most of the initialisation (INSECURE!)
66 -o optimised initialisation mode (should be as secure as the default but faster)
67 -y verifies the passphrase by asking for it twice
68 -f force file overwriting in format mode and/or disable confirmation dialog
69 -F only for action start: run fsck before mounting the filesystem. Use fsck's -f option if given twice.
70 -m additional arguments to mount
71 -v verbose (show what is going on, v++)
74 CRYPTSETUP FORMAT OPTIONS:
75 -S cipher size, could be 128, 192 or 256 (default=$CIPHER_SIZE_)
76 -C cipher, should be aes-plain for pre-2.6.10 (default=$CIPHER_)
77 -I iteration time spend with PBKDF2 password processing in seconds (default=$ITERATION_TIME_)
78 -A additional arguments for cryptsetup (only supportet by format)
81 format <device/file> [mountpoint]
82 Format a device or a file (is created with the given size if it
83 does not exist) with the given filesystem and mount it, if a
85 start <device/file> <mountpoint>
86 Mount the device/file in the mountpoint.
88 Umount the given mountpoint (umount, luksClose, losetup -d)
94 losetup does _NOT_ work on unionfs => grml-crypt with a filesystem image does ONLY
95 work if the image is on a tmpfs (eg. in /home/grml or /tmp).
106 # first trying normal devicename
107 tmp_="${DM_PREFIX_}${device_}"
108 if [ ! -e "$tmp_" ]; then
113 # second trying uuid of luks
114 #uuid_=`execute "$CRYPTSETUP_ luksUUID $1"`
115 #if [[ $? == 0 ]]; then
116 # echo "$prefix_$uuid_"
119 warn "could not create device-mapper name for $1"
124 function formatDevice
126 type_="$1" # could be donothing or init
129 args_="$VERIFY_PW_ $BATCH_MODE_ --key-size $CIPHER_SIZE_ --cipher $CIPHER_ --iter-time $ITERATION_TIME_ $ADDITIONAL_CRYPTSETUP_ARGS_"
130 #args_=`echo "$args_" |tr -s ' '`
131 execute "$CRYPTSETUP_ $args_ luksFormat $TARGET_" warn || return 1
133 execute "$CRYPTSETUP_ luksOpen $TARGET_ $DM_NAME_" warn \
134 "could not open $DM_PATH_ to create a filesystem on it!" || return 1
135 if [[ $type_ == 'init' && $OPTIMIZED_MODE_SET_ == 'true' ]]; then
136 echo "finishing optimised initialisation (this could take some time)"
138 execute "dd if=/dev/zero of=$DM_PATH_ bs=1M &>/dev/null" # || \
139 # warn "could not finish optimised initialisation properly"
141 # cutted out because of no space left on device error :(
142 #if [[ $ret_ != 0 ]]; then
143 # execute "$CRYPTSETUP_ luksClose $DM_NAME_" warn
148 execute "$MKFS_ $DM_PATH_ >/dev/null" warn
149 if [[ $? != 0 ]]; then
150 execute "$CRYPTSETUP_ luksClose $DM_NAME_"
151 warn "could not create filesystem on $DM_PATH_" 1
154 echo "Successully created $FSTYPE_ on encrypted $TARGET_"
164 # no mountpoint, by-by
165 if [[ "$MOUNT_POINT_" == "" ]]; then
167 die 'no mountpoint given'
169 if [ ! -d "$MOUNT_POINT_" ]; then
170 die "mountpoint $MOUNT_POINT_ does not exist"
172 # removed due to unionfs problem isLuks does not work with filesystem images
174 #$CRYPTSETUP_ isLuks $TARGET_ || die "$TARGET_ is not a luks partition"
176 # TARGET (is/should be) a filesystem image
177 if [ ! -b "$TARGET_" ]; then
178 notice "Operating on a file"
179 isExistent "$TARGET_" die "image does not exist"
180 TARGET_=`findNextFreeLoop` || die "could not find a free loop device"
182 # TARGET_ is now /dev/loop<x>
183 execute "losetup $TARGET_ $ORIG_TARGET_" die
186 $READONLY_SET_ && cargs_='--readonly'
187 execute "$CRYPTSETUP_ $cargs_ luksOpen $TARGET_ $DM_NAME_" warn || execute "losetup -d $TARGET_" || \
188 die "could not luksOpen $TARGET_"
189 if [[ "$FSCK_" == "true" ]] ; then
190 execute "fsck -C $DM_PATH_" || die "fsck failed on $DM_PATH_"
191 elif [[ "$FSCK_" == "trueforce" ]] ; then
192 execute "fsck -f -C $DM_PATH_" || die "fsck failed on $DM_PATH_"
195 $READONLY_SET_ && margs_='-r'
196 execute "mount $margs_ $ADDITIONAL_MOUNT_ARGS_ $DM_PATH_ $MOUNT_POINT_" die
205 isExistent "$mp_" die
206 tmp_=`realpath $mp_` || die "could not get realpath of $mp_"
207 dprint "realpath_=\"$tmp_\""
209 dm_path_=`mount |grep "$tmp_ "` || die "$tmp_ is not mounted"
210 dprint "dm_path_=\"$dm_path_\""
211 dm_path_=`echo $dm_path_ |awk '{print $1}'` || die "could not get devicemapper name for $tmp_"
212 dprint "dm_path_=\"$dm_path_\""
215 for dmapper in /dev/mapper/grml-crypt* ; do
216 link=$(readlink -f "$dmapper")
217 dprint "looping device mapper devices, dmapper=$dmapper => link=$link"
218 if [ "$link" = "$dm_path_" ] ; then
219 tmp_dm_path_="$dmapper"
223 if [ -n "$tmp_dm_path_" ] ; then
224 dm_path_="$tmp_dm_path_"
227 dm_name_="${dm_path_##*/}"
228 dprint "dm_name_=\"$dm_name_\""
230 dmsetup info $dm_name_ >/dev/null ||die "$dm_name_ is not active"
231 device_=`$CRYPTSETUP_ status $dm_name_ |awk '/device:/{print $2}'` || \
232 die "could not get underlying device of $dm_path_"
233 dprint "device_=\"$device_\""
235 execute "umount $dm_path_" die "could not unmount $device_"
236 execute "$CRYPTSETUP_ luksClose $dm_name_" die "could not close $dm_path_"
237 echo "$device_" |grep loop &>/dev/null && execute "losetup -d $device_" \
238 die "could not delete loop device $device_" || \
239 execute "losetup -d $device_ &>/dev/null" eprint "could not delete loop device $device_, \
240 this device possibly is not a loop device => maybe bogus error"
241 notice "$mp_ successfully unmountet/closed/deleted"
251 echo -n " (type uppercase yes): " >&2
253 if [[ $input == 'YES' ]]; then
260 function actionFormat
266 if (( $SIZE_ < 3 )); then
267 die "the minimum size of an encrypted luks partition should be 2"
270 # TARGET (is/should be) a filesystem image
271 if [ ! -b "$TARGET_" ]; then
272 notice "Operating on a file"
274 if [ -e "$TARGET_" ]; then
275 $FORCE_ || die "$TARGET_ does already exist"
276 warn "overwriting file $TARGET_"
279 echo -n "Initialising file with "
280 if [[ $OPTIMIZED_MODE_SET_ == 'true' ]]; then
281 echo "optimised SECURE mode"
282 execute "dd if=/dev/zero of=$TARGET_ bs=1M count=${SIZE_} &>/dev/null" \
283 die "could not initialise $TARGET_ with /dev/zero"
285 if [[ $ENTROPY_SOURCE_ == '/dev/zero' ]]; then
286 echo "INSERCURE mode"
288 echo "SECURE mode (taking /dev/urandom as source, this could take some time)"
290 execute "dd if=$ENTROPY_SOURCE_ of=$TARGET_ bs=1M count=${SIZE_} &>/dev/null" ||\
291 die "could not initialise $TARGET_ with $ENTROPY_SOURCE_"
295 TARGET_=`findNextFreeLoop` || die "could not find a free loop device"
297 # TARGET_ is now /dev/loop<x>
298 execute "losetup $TARGET_ $ORIG_TARGET_" die
299 if [[ $OPTIMIZED_MODE_SET_ == 'true' || $ENTROPY_SOURCE_ == '/dev/zero' ]]; then
300 execute "dd if=/dev/urandom of=$TARGET_ bs=1M count=2 &>/dev/null" \
301 die "could not initialise the fist 2MB of $TARGET_ with /dev/urandom"
303 formatDevice "$init_"
306 $FORCE_ || (yesDialog "Are you shure you want to overwrite $TARGET_ ?" || die 'You are not sure')
307 notice 'Operating on a device'
308 echo -n 'Initialising device with '
309 if [[ $OPTIMIZED_MODE_SET_ == 'true' ]]; then
310 echo "optimised SECURE mode"
311 execute "dd if=/dev/urandom of=$TARGET_ bs=1M count=2 &>/dev/null" ||\
312 die "could not initialise the first 2MB of $TARGET_ with /dev/urandom"
313 elif [[ $ENTROPY_SOURCE_ != '/dev/zero' ]]; then
315 echo "SECURE mode (taking $ENTROPY_SOURCE_ as source, this could take some time)"
316 execute "dd if=$ENTROPY_SOURCE_ of=$TARGET_ bs=1M &>/dev/null" #||\
317 # skipped because "no space left on device" from dd
318 # die "could not initialise $TARGET_ with $ENTROPY_SOURCE_"
320 echo 'INSECURE mode (only initialising the fist 2MB with /dev/urandom)'
321 execute "dd if=/dev/urandom of=$TARGET_ bs=1M count=2 &>/dev/null" \
322 die "could not initialise the first 2MB of $TARGET_ with /dev/urandom"
325 formatDevice "$init_"
329 # formatDevice was successfully
330 if (( $ret_ == 0 )); then
331 # a mountpoint was given (don't luksClose the device)
332 local mount_point_exists_='true'
333 test -d "$MOUNT_POINT_" || mount_point_exists_='false'
335 if [[ $MOUNT_POINT_ != "" && "$mount_point_exists_" == 'true' ]]; then
336 $READONLY_SET_ && margs_='-r'
337 execute "mount $margs_ $ADDITIONAL_MOUNT_ARGS_ $DM_PATH_ $MOUNT_POINT_" die
339 if [[ $MOUNT_POINT_ != "" ]]; then
340 $mount_point_exists_ || warn "mountpoint $MOUNT_POINT_ does not exist, not mounting. please use \"grml-crypt start $ORIG_TARGET_ <mountpoint>\" to start the device"
342 execute "$CRYPTSETUP_ luksClose $DM_NAME_" warn
343 $IS_IMAGE_ && execute "losetup -d $TARGET_" warn
346 execute "$CRYPTSETUP_ luksClose $DM_NAME_" warn
347 $IS_IMAGE_ && execute "losetup -d $TARGET_" warn
357 while getopts "s:t:rzoyfFm:hvS:C:I:A:" opt; do
359 s) SIZE_="$OPTARG"; SIZE_SET_='true' ;;
360 t) FSTYPE_="$OPTARG" ;;
361 r) READONLY_SET_='true' ;;
362 z) let OPTIMIZING_LEVEL_=$OPTIMIZING_LEVEL_+1
363 ENTROPY_SOURCE_='/dev/zero'
364 warn 'initialising from INSECURE source /dev/zero' ;;
365 o) let OPTIMIZING_LEVEL_=$OPTIMIZING_LEVEL_+1
366 OPTIMIZED_MODE_SET_='true' ;;
367 y) VERIFY_PW_="--verify-passphrase" ;;
369 F) if [[ "$FSCK_" == "true" ]] ; then
375 m) ADDITIONAL_MOUNT_ARGS_="$OPTARG" ;;
376 h) printUsage; exit ;;
377 v) let verbose_=$verbose_+1 ;;
378 S) CIPHER_SIZE_="$OPTARG" ;;
379 C) CIPHER_="$OPTARG" ;;
380 I) ITERATION_TIME_="$OPTARG" ;;
381 A) ADDITIONAL_CRYPTSETUP_ARGS_="$OPTARG" ;;
382 ?) printUsage; exit 64 ;;
385 shift $(($OPTIND - 1)) # set ARGV to the first not parsed commandline parameter
388 checkRoot die "You have to be root to use this program"
391 if [[ $1 == 'help' ]]; then
395 if (( $# < 2 )); then
397 die "wrong number of arguments ($#)" 1
399 if (( $OPTIMIZING_LEVEL_ > 1 )); then
401 die "please choose ONE initialisation methode"
405 MKFS_="/sbin/mkfs.$FSTYPE_"
406 if [ ! -x "$MKFS_" ]; then
407 die "invalid filesystem type \"$FSTYPE_\"" 1
410 # use batch-mode if available
411 $CRYPTSETUP_ $BATCH_MODE_ --help &>/dev/null;
414 0) dprint "your cryptsetup understands --batch-mode" ;;
415 1) BATCH_MODE_=""; notice "your cryptsetup does NOT understand --batch-mode, trying without" ;;
416 127) die "could not execute cryptsetup" 127 ;;
417 *) warn "problems executing $CRYPTSETUP_" $ret_
420 DM_NAME_="`getDMName $TARGET_`"
421 DM_PATH_="$DEV_MAPPER_/$DM_NAME_"
422 ORIG_TARGET_="$TARGET_"
426 format) ACTION_='format'; actionFormat ;;
427 start) ACTION_='start'; actionStart ;;
428 stop) ACTION_='stop'; actionStop "$TARGET_" ;;
433 ################################################################################
434 # vim:foldmethod=marker tabstop=2 expandtab shiftwidth=2