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https://github.com/prurigro/cryptobox.git
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Wrapped variables in quotes where appropriate, numerous fixes were
made, and errors now produce error messages and then exit with a failed state
This commit is contained in:
Kevin MacMartin
parent
a7d486176b
commit
f719c5df60
1 changed files with 50 additions and 59 deletions
109
cryptobox
109
cryptobox
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@ -10,85 +10,76 @@
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# #
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##############################################################
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NAME=`echo $0 | grep -o -e "[^\/]*$"`
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NAME=`echo "$0" | grep -o -e "[^\/]*$"`
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# Check for root
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[[ "$UID" -ne 0 ]] && (echo -e "Error: Please run this script with root permissions\n"; exit 1)
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# Check dependencies
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[[ `type -P dd` ]] || (echo "Error: The 'dd' program is missing"; exit 1)
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[[ `type -P losetup` ]] || (echo "Error: The 'losetup' program is missing"; exit 1)
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[[ `type -P cryptsetup` ]] || (echo "Error: The 'cryptsetup' program is missing"; exit 1)
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[[ `type -P mkfs` ]] || (echo "Error: The 'mkfs' program is missing"; exit 1)
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# Load modules if they aren't present
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[[ `lsmod | grep loop` ]] || echo "loading 'loop' module"; modprobe loop || (echo "Error: failed to load 'loop' module"; exit 1)
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[[ `lsmod | grep dm_mod` ]] || echo "loading 'dm_mod' module"; modprobe dm_mod || (echo "Error: failed to load 'dm_mod' module"; exit 1)
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function errorquit {
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echo -e "Error: $1"
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[[ "$1" = "syntax" ]] && (echo; usage)
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exit 1
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}
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function usage {
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echo -e "${NAME}: create and mount encrypted images\n"
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echo "Usage: ${NAME} option arguments"
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echo "Usage: $NAME option arguments"
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echo -e "\tc (create) -> $NAME c filename.img filesystem size-in-mb"
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echo -e "\tm (mount) -> $NAME m filename.img /mount/point"
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echo -e "\tu (umount) -> $NAME u /mount/point"
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}
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# Check for root
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[[ "$UID" -ne 0 ]] && errorquit "run with root permission\n"
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# Check dependencies
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[[ `type -P dd` ]] || errorquit "Error: The 'dd' program is missing"
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[[ `type -P losetup` ]] || errorquit "Error: The 'losetup' program is missing"
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[[ `type -P cryptsetup` ]] || errorquit "Error: The 'cryptsetup' program is missing"
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[[ `type -P mkfs` ]] || errorquit "Error: The 'mkfs' program is missing"
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# Load modules if they aren't present
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[[ `lsmod | grep loop` ]] || echo "loading 'loop' module"; modprobe loop || errorquit "Error: failed to load 'loop' module"
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[[ `lsmod | grep dm_mod` ]] || echo "loading 'dm_mod' module"; modprobe dm_mod || errorquit "Error: failed to load 'dm_mod' module"
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if [ -z "$1" ]; then
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usage
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exit 1
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usage; exit 1
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elif [ ! "$1" = "c" -a ! "$1" = "m" -a ! "$1" = "u" ]; then
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echo "syntax error"
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usage
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exit 1
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errorquit "syntax"
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fi
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case "$1" in
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"c")
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if [ -z "$2" -o -z "$3" -o -z "$4" ]; then
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echo "syntax error"
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usage
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exit 1
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fi
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if [ -f "$2" ]; then
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echo "error: $2 already exists"
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exit 1
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fi
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c)
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if [ -z "$2" -o -z "$3" -o -z "$4" ]; then errorquit "syntax"; fi
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[[ -f "$2" ]] && errorquit "$2 already exists"
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LOOPDEV=`losetup -f`
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CONTAINER=`echo "$2" | sed s/"[^\/]*\/"//g | sed s/"\.".*$//g`
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dd bs=1M count="$4" if=/dev/urandom of="$2"
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losetup $LOOPDEV "$2"
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cryptsetup -c aes-xts-plain -y -s 512 luksFormat $LOOPDEV
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cryptsetup luksOpen $LOOPDEV $CONTAINER
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mkfs -t "$3" /dev/mapper/$CONTAINER || echo "error: mkfs failed for filesystem type: $3"
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cryptsetup luksClose $CONTAINER
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losetup -d $LOOPDEV
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dd bs=1M count="$4" if=/dev/urandom of="$2" || errorquit "couldn't create create image file"
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losetup "$LOOPDEV" "$2" || errorquit "couldn't setup loop device (${LOOPDEV})"
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cryptsetup -c aes-xts-plain -y -s 512 luksFormat "$LOOPDEV" || errorquit "couldn't encrypt image file"
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cryptsetup luksOpen "$LOOPDEV" "$CONTAINER" || errorquit "couldn't decrypt $CONTAINER"
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mkfs -t "$3" "/dev/mapper/${CONTAINER}" || errorquit "mkfs failed for filesystem type: $3"
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cryptsetup luksClose "$CONTAINER" || errorquit "couldn't close encryption for $CONTAINER"
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sleep 1
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losetup -d "$LOOPDEV" || errorquit "couldn't close loop device (${LOOPDEV})"
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;;
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"m")
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if [ -z "$2" -o -z "$3" ]; then echo -e "Error: syntax\n"; usage; exit 1; fi
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[[ ! -f "$2" ]] && (echo "Error: $2 does not exist"; exit 1)
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[[ -d "$3" ]] || (echo "Error: $3 does not exist"; exit 1)
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m)
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if [ -z "$2" -o -z "$3" ]; then errorquit "syntax"; fi
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[[ ! -f "$2" ]] && errorquit "$2 does not exist"
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[[ -d "$3" ]] || errorquit "$3 does not exist"
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LOOPDEV=$(losetup -f)
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CONTAINER=$(echo $LOOPDEV | sed s/"[^\/]*\/"//g | sed s/"\.".*$//g)
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losetup $LOOPDEV "$2"
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cryptsetup luksOpen $LOOPDEV $CONTAINER
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mount /dev/mapper/$CONTAINER "$3"
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CONTAINER=$(echo "$LOOPDEV" | sed s/"[^\/]*\/"//g | sed s/"\.".*$//g)
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losetup "$LOOPDEV" "$2" || errorquit "couldn't setup loop device (${LOOPDEV})"
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cryptsetup luksOpen "$LOOPDEV" "$CONTAINER" || errorquit "couldn't decrypt $CONTAINER"
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mount "/dev/mapper/${CONTAINER}" "$3" || errorquit "couldn't mount /dev/mapper/${CONTAINER} on $3"
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;;
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"u")
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if [ -z "$2" ]; then
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echo "syntax error"
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usage
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exit 1
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fi
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u)
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if [ -z "$2" ]; then errorquit "syntax"; fi
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MOUNT=`mount | grep $(echo "$2" | sed s/"\/"$//)`
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if [ -z "$MOUNT" ]; then
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echo "error: $2 is not mounted"
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exit 1
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fi
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LOOPDEV=`echo $MOUNT | sed s/\ .*//g | sed s/"\/mapper"//`
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CONTAINER=`echo $LOOPDEV | sed s/"[^\/]*\/"//g | sed s/"\.".*$//g`
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umount "$2"
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cryptsetup luksClose $CONTAINER
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losetup -d $LOOPDEV
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[[ -z "$MOUNT" ]] && errorquit "$2 is not mounted"
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LOOPDEV=`echo "$MOUNT" | sed s/\ .*//g | sed s/"\/mapper"//`
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CONTAINER=`echo "$LOOPDEV" | sed s/"[^\/]*\/"//g | sed s/"\.".*$//g`
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umount "$2" || errorquit "Couldn't unmount $2"
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cryptsetup luksClose "$CONTAINER" || errorquit "couldn't close encryption for $CONTAINER"
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sleep 1
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losetup -d "$LOOPDEV" || errorquit "couldn't close loop device (${LOOPDEV})"
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;;
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generic)
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usage
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