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#!/bin/bash
#This is free and unencumbered software released into the public domain.
#Because this script needs root to do some things, excessive amounts of
#checking have been done to terminate the script if anything fails.
#Read all instructions very carefully. When it asks to type "yes", it must be
#all uppercase or it will fail.
#Don't try to use absolute paths, it will probably break things.
#Make sure cryptsetup is installed
cryptCheck(){
command -v cryptsetup > /dev/null
return "${PIPESTATUS[0]}"
}
#check to see if loop is loaded
loopCheck(){
grep -e "^loop" /proc/modules > /dev/null
return "${PIPESTATUS[0]}"
}
#check to see if ext4 is loaded
ext4Check(){
grep -e "^ext4" /proc/modules > /dev/null
return "${PIPESTATUS[0]}"
}
#Create new container.
createContainer(){
if [[ ! "$2" =~ ^-?[0-9]+$ ]]
then
echo "second number should be a number of bytes"
echo "example: createContainer CONTAINER_NAME 128"
return 1
fi
cryptCheck
if [[ ! $? == 0 ]]
then
echo "cryptsetup is not installed"
return 1
fi
loopCheck
if [[ ! $? == 0 ]]
then
echo "loop kernel module not loaded"
echo "run: sudo modprobe loop"
return 1
fi
ext4Check
if [[ ! $? == 0 ]]
then
echo "ext4 kernel module not loaded"
echo "try restarting the machine"
return 1
fi
if [[ -f "$1" ]]
then
echo "The file ""$1"" already exists, pick a different filename"
return 1
fi
echo "please wait... files over a few megabytes might take awhile"
dd if=/dev/zero of="$PWD"/"$1" bs=1M count="$2"
if [[ ! $? == 0 ]]
then return 1
fi
LOOPDEV=$(losetup -f)
sudo losetup "$LOOPDEV" "$PWD"/"$1"
if [[ ! $? == 0 ]]
then return 1
fi
sudo cryptsetup \
--verbose \
--verify-passphrase \
--iter-time 4000 \
luksFormat "$LOOPDEV"
if [[ ! $? == 0 ]]
then return 1
fi
MAPNAME=""$1"MAP"
sudo cryptsetup luksOpen "$LOOPDEV" "$MAPNAME"
sudo mkfs.ext4 "/dev/mapper/"$MAPNAME""
if [[ ! $? == 0 ]]
then return 1
fi
sudo cryptsetup luksClose "$MAPNAME"
if [[ ! $? == 0 ]]
then
echo "failed to close "$MAPNAME""
return 1
fi
sudo losetup --detach "$LOOPDEV"
if [[ ! $? == 0 ]]
then return 1
fi
}
#mount container
mountContainer(){
LOOPDEV=$(losetup -f)
MAPNAME=""$1"MAP"
sudo losetup "$LOOPDEV" "$1"
if [[ ! $? == 0 ]]
then return 1
fi
sudo cryptsetup luksOpen "$LOOPDEV" "$MAPNAME"
if [[ ! $? == 0 ]]
then return 1
fi
CRYPTDIR=""$HOME"/PRIVATEDIRECTORY/"$MAPNAME""
mkdir -p "$CRYPTDIR"
sudo mount --options uid=$UID /dev/mapper/"$MAPNAME" "$CRYPTDIR"
}
#unmount container
#The arguement used here should be the exact name of the container file that
#is mounted.
#example: unmountContainer CONTAINERFILE
unmountContainer(){
MAPNAME=""$1"MAP"
sudo umount ""$HOME"/PRIVATEDIRECTORY/"$MAPNAME""
if [[ ! $? == 0 ]]
then
echo "failed to unmount "$1""
return 1
fi
LOOPDEV=$(losetup -a | grep "$1" | cut -c -10)
sudo cryptsetup luksClose "$MAPNAME"
if [[ ! $? == 0 ]]
then return 1
fi
sudo losetup -d "$LOOPDEV"
if [[ ! $? == 0 ]]
then return 1
fi
}
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