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Wrapped variables in quotes where appropriate, numerous fixes were

Browse source 
made, and errors now produce error messages and then exit with a
failed state
This commit is contained in:
Kevin MacMartin 2014-05-29 03:51:54 -04:00
parent a7d486176b
commit f719c5df60
1 changed files with 50 additions and 59 deletions
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cryptobox
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@ -10,85 +10,76 @@
# # # #
############################################################## ##############################################################
NAME=`echo $0 | grep -o -e "[^\/]*$"` NAME=`echo "$0" | grep -o -e "[^\/]*$"`
# Check for root function errorquit {
[[ "$UID" -ne 0 ]] && (echo -e "Error: Please run this script with root permissions\n"; exit 1) echo -e "Error: $1"
[[ "$1" = "syntax" ]] && (echo; usage)
# Check dependencies exit 1
[[ `type -P dd` ]] || (echo "Error: The 'dd' program is missing"; exit 1) }
[[ `type -P losetup` ]] || (echo "Error: The 'losetup' program is missing"; exit 1)
[[ `type -P cryptsetup` ]] || (echo "Error: The 'cryptsetup' program is missing"; exit 1)
[[ `type -P mkfs` ]] || (echo "Error: The 'mkfs' program is missing"; exit 1)
# Load modules if they aren't present
[[ `lsmod | grep loop` ]] || echo "loading 'loop' module"; modprobe loop || (echo "Error: failed to load 'loop' module"; exit 1)
[[ `lsmod | grep dm_mod` ]] || echo "loading 'dm_mod' module"; modprobe dm_mod || (echo "Error: failed to load 'dm_mod' module"; exit 1)
function usage { function usage {
echo -e "${NAME}: create and mount encrypted images\n" echo -e "${NAME}: create and mount encrypted images\n"
echo "Usage: ${NAME} option arguments" echo "Usage: $NAME option arguments"
echo -e "\tc (create) -> $NAME c filename.img filesystem size-in-mb" echo -e "\tc (create) -> $NAME c filename.img filesystem size-in-mb"
echo -e "\tm (mount) -> $NAME m filename.img /mount/point" echo -e "\tm (mount) -> $NAME m filename.img /mount/point"
echo -e "\tu (umount) -> $NAME u /mount/point" echo -e "\tu (umount) -> $NAME u /mount/point"
} }
# Check for root
[[ "$UID" -ne 0 ]] && errorquit "run with root permission\n"
# Check dependencies
[[ `type -P dd` ]] || errorquit "Error: The 'dd' program is missing"
[[ `type -P losetup` ]] || errorquit "Error: The 'losetup' program is missing"
[[ `type -P cryptsetup` ]] || errorquit "Error: The 'cryptsetup' program is missing"
[[ `type -P mkfs` ]] || errorquit "Error: The 'mkfs' program is missing"
# Load modules if they aren't present
[[ `lsmod | grep loop` ]] || echo "loading 'loop' module"; modprobe loop || errorquit "Error: failed to load 'loop' module"
[[ `lsmod | grep dm_mod` ]] || echo "loading 'dm_mod' module"; modprobe dm_mod || errorquit "Error: failed to load 'dm_mod' module"
if [ -z "$1" ]; then if [ -z "$1" ]; then
usage usage; exit 1
exit 1
elif [ ! "$1" = "c" -a ! "$1" = "m" -a ! "$1" = "u" ]; then elif [ ! "$1" = "c" -a ! "$1" = "m" -a ! "$1" = "u" ]; then
echo "syntax error" errorquit "syntax"
usage
exit 1
fi fi
case "$1" in case "$1" in
"c") c)
if [ -z "$2" -o -z "$3" -o -z "$4" ]; then if [ -z "$2" -o -z "$3" -o -z "$4" ]; then errorquit "syntax"; fi
echo "syntax error" [[ -f "$2" ]] && errorquit "$2 already exists"
usage
exit 1
fi
if [ -f "$2" ]; then
echo "error: $2 already exists"
exit 1
fi
LOOPDEV=`losetup -f` LOOPDEV=`losetup -f`
CONTAINER=`echo "$2" | sed s/"[^\/]*\/"//g | sed s/"\.".*$//g` CONTAINER=`echo "$2" | sed s/"[^\/]*\/"//g | sed s/"\.".*$//g`
dd bs=1M count="$4" if=/dev/urandom of="$2" dd bs=1M count="$4" if=/dev/urandom of="$2" || errorquit "couldn't create create image file"
losetup $LOOPDEV "$2" losetup "$LOOPDEV" "$2" || errorquit "couldn't setup loop device (${LOOPDEV})"
cryptsetup -c aes-xts-plain -y -s 512 luksFormat $LOOPDEV cryptsetup -c aes-xts-plain -y -s 512 luksFormat "$LOOPDEV" || errorquit "couldn't encrypt image file"
cryptsetup luksOpen $LOOPDEV $CONTAINER cryptsetup luksOpen "$LOOPDEV" "$CONTAINER" || errorquit "couldn't decrypt $CONTAINER"
mkfs -t "$3" /dev/mapper/$CONTAINER || echo "error: mkfs failed for filesystem type: $3" mkfs -t "$3" "/dev/mapper/${CONTAINER}" || errorquit "mkfs failed for filesystem type: $3"
cryptsetup luksClose $CONTAINER cryptsetup luksClose "$CONTAINER" || errorquit "couldn't close encryption for $CONTAINER"
losetup -d $LOOPDEV sleep 1
losetup -d "$LOOPDEV" || errorquit "couldn't close loop device (${LOOPDEV})"
;; ;;
"m") m)
if [ -z "$2" -o -z "$3" ]; then echo -e "Error: syntax\n"; usage; exit 1; fi if [ -z "$2" -o -z "$3" ]; then errorquit "syntax"; fi
[[ ! -f "$2" ]] && (echo "Error: $2 does not exist"; exit 1) [[ ! -f "$2" ]] && errorquit "$2 does not exist"
[[ -d "$3" ]] || (echo "Error: $3 does not exist"; exit 1) [[ -d "$3" ]] || errorquit "$3 does not exist"
LOOPDEV=$(losetup -f) LOOPDEV=$(losetup -f)
CONTAINER=$(echo $LOOPDEV | sed s/"[^\/]*\/"//g | sed s/"\.".*$//g) CONTAINER=$(echo "$LOOPDEV" | sed s/"[^\/]*\/"//g | sed s/"\.".*$//g)
losetup $LOOPDEV "$2" losetup "$LOOPDEV" "$2" || errorquit "couldn't setup loop device (${LOOPDEV})"
cryptsetup luksOpen $LOOPDEV $CONTAINER cryptsetup luksOpen "$LOOPDEV" "$CONTAINER" || errorquit "couldn't decrypt $CONTAINER"
mount /dev/mapper/$CONTAINER "$3" mount "/dev/mapper/${CONTAINER}" "$3" || errorquit "couldn't mount /dev/mapper/${CONTAINER} on $3"
;; ;;
"u") u)
if [ -z "$2" ]; then if [ -z "$2" ]; then errorquit "syntax"; fi
echo "syntax error"
usage
exit 1
fi
MOUNT=`mount | grep $(echo "$2" | sed s/"\/"$//)` MOUNT=`mount | grep $(echo "$2" | sed s/"\/"$//)`
if [ -z "$MOUNT" ]; then [[ -z "$MOUNT" ]] && errorquit "$2 is not mounted"
echo "error: $2 is not mounted" LOOPDEV=`echo "$MOUNT" | sed s/\ .*//g | sed s/"\/mapper"//`
exit 1 CONTAINER=`echo "$LOOPDEV" | sed s/"[^\/]*\/"//g | sed s/"\.".*$//g`
fi umount "$2" || errorquit "Couldn't unmount $2"
LOOPDEV=`echo $MOUNT | sed s/\ .*//g | sed s/"\/mapper"//` cryptsetup luksClose "$CONTAINER" || errorquit "couldn't close encryption for $CONTAINER"
CONTAINER=`echo $LOOPDEV | sed s/"[^\/]*\/"//g | sed s/"\.".*$//g` sleep 1
umount "$2" losetup -d "$LOOPDEV" || errorquit "couldn't close loop device (${LOOPDEV})"
cryptsetup luksClose $CONTAINER
losetup -d $LOOPDEV
;; ;;
generic) generic)
usage usage