mirror of
https://github.com/prurigro/cryptobox.git
synced 2024-12-29 02:44:34 -05:00
Rewrite the script using best practices, way more error checks, nice colour output and an updated encryption algorithm for new images
This commit is contained in:
Kevin MacMartin
parent
f32decc0da
commit
4376e91b94
2 changed files with 262 additions and 80 deletions
28
README.md
28
README.md
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@ -1,25 +1,29 @@
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# Cryptobox #
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# Cryptobox
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A wrapper script for **cryptsetup** that makes it easy to create, mount and unmount encrypted image files using LUKS.
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A script that makes it easy to create, mount and unmount encrypted images in Linux using LUKS
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## Requirements ##
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* **cryptsetup**: Userspace setup tool for transparent encryption of block devices using.
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* **util-linux**: Miscellaneous system utilities for Linux, required for **losetup** and **mkfs**.
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* **cryptsetup**
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* **util-linux**:
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* **losetup**
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* **mkfs**
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* **coreutils**:
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* **dd**
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## Usage ##
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* `cryptobox`: displays the list of commands
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* `cryptobox c filename.img filesystem size-in-mb`: creates an image file with a given filesystem and size in megabytes.
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* eg: `cryptobox c myimg.img ext4 128`
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* `cryptobox m filename.img /mount/point`: mounts a given image file on a given directory.
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* eg: `cryptobox m myimg.img /mnt/cryptoimg`
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* `cryptobox u /mount/point`: unmounts an image file from a given directory.
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* eg: `cryptobox u /mnt/cryptoimg`
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* **create**: `c|-c|--create [filename] [filesystem] [size-in-mb]`
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* **mount**: `m|-m|--mount [filename] [mountpoint]`
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* **umount**: `u|-u|--unmount [mountpoint]`
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* **help**: `h|-h|--help`
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## Credits ##
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Written by Kevin MacMartin: [GitHub Projects](https://github.com/prurigro?tab=repositories) | [Arch Linux AUR Packages](https://aur.archlinux.org/packages/?SeB=m&K=prurigro)
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Written by Kevin MacMartin
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* [GitHub Projects](https://github.com/prurigro?tab=repositories)
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* [Arch Linux AUR Packages](https://aur.archlinux.org/packages/?SeB=m&K=prurigro)
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## License ##
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314
cryptobox
314
cryptobox
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@ -1,87 +1,265 @@
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#!/usr/bin/env bash
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##############################################################
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# #
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# CryptoBox #
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# #
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# A script that wraps cryptsetup, mkfs and losetup to make #
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# it easy to create, mount and unmount encrypted image #
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# files using LUKS. #
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# #
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##############################################################
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#
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# CryptoBox
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#
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# A script that makes it easy to create, mount
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# and unmount encrypted images in Linux using LUKS
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#
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# Written by Kevin MacMartin
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#
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# Licensed under the GPLv3
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#
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NAME=`echo "$0" | grep -o -e "[^\/]*$"`
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[[ -t 1 ]] && {
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c_d=$'\e[1;30m' # DARK GREY
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c_r=$'\e[1;31m' # RED
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c_g=$'\e[1;32m' # GREEN
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c_y=$'\e[1;33m' # YELLOW
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c_b=$'\e[1;34m' # BLUE
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c_m=$'\e[1;35m' # VIOLET
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c_t=$'\e[1;36m' # TEAL
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c_w=$'\e[1;37m' # WHITE
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c_u=$'\e[1;4;37m' # UNDERLINE WHITE
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c_h=$'\e[1;41m' # HIGHLIGHT RED
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c_c=$'\e[0m' # DISABLES COLOUR
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}
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function errorquit {
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echo -e "Error: $1"
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[[ "$1" = "syntax" ]] && (echo; usage)
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# The name of the script
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scriptname="${0/*\/}"
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# Display uage information
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function usage {
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printf '%s\n\n' "${c_w}Create, mount and unmount encrypted images${c_c}"
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printf '%s\n' "${c_w}Usage:${c_c}"
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printf ' %s\n' "${c_y}create${c_w}: ${c_m}c${c_w}|${c_m}-c${c_w}|${c_m}--create${c_c} ${c_w}$scriptname${c_c} ${c_m}c${c_c} [${c_b}filename${c_c}] [${c_g}filesystem${c_c}] [${c_t}size-in-mb${c_c}]"
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printf ' %s\n' "${c_y}mount${c_w}: ${c_m}m${c_w}|${c_m}-m${c_w}|${c_m}--mount${c_c} ${c_w}$scriptname${c_c} ${c_m}m${c_c} [${c_b}filename${c_c}] [${c_r}mountpoint${c_c}]"
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printf ' %s\n' "${c_y}umount${c_w}: ${c_m}u${c_w}|${c_m}-u${c_w}|${c_m}--unmount${c_c} ${c_w}$scriptname${c_c} ${c_m}u${c_c} [${c_r}mountpoint${c_c}]"
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printf ' %s\n' "${c_y}help${c_w}: ${c_m}h${c_w}|${c_m}-h${c_w}|${c_m}--help${c_c} ${c_w}$scriptname${c_c} ${c_m}h${c_c}"
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exit "$1"
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}
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# Exit with a nicely formatted error
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function error_exit {
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printf '%s\n' "${c_r}Error${c_c}: ${c_w}$1${c_c}" >&2
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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 -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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function luks_open {
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loopdev="$1"
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container="$2"
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# Decrypt the image so we can use it
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while (( 1 )); do
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if cryptsetup luksOpen "$loopdev" "$container"; then
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break
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else
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printf '%s' "${c_w}Failed to decrypt ${c_m}$container${c_w}, press return to try again or ctrl+c to exit$c_c"
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read -r
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fi
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done
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}
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function luks_close {
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loopdev="$1"
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container="$2"
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# Close the encrypted device
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cryptsetup luksClose "$container" || error_exit "Unable to close the decrypted device for ${c_m}$container"
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sleep 1
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# Close the loop device
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losetup -d "$loopdev" || error_exit "Unable to close the loop device ${c_m}$loopdev"
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}
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function create_image {
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# Exit with an error if exactly 3 arguments haven't been given
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[[ -n "$3" && -z "$4" ]] || error_exit 'Incorrect number of arguments for the create command'
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# Store the provided arguments as named variables so they're easier to keep track of
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filename="$1"
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filesystem="$2"
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size="$3"
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# Exit with an error if the image file already exists
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[[ ! -e "$filename" ]] || error_exit "$filename already exists"
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# Exit with an error if the filesystem isn't available
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mkfs_binaries=("$(type -P mkfs)".*)
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grep -q mkfs."$filesystem" <<< "${mkfs_binaries[*]}" || error_exit "The filesystem ${c_m}$filesystem${c_w} is not available"
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# Exit with an error if size isn't a number
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[[ "$size" =~ ^[0-9]*$ ]] || error_exit 'The argument for the size is not a number'
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# Exit with an error if size is less than 18
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(( size >= 18 )) || error_exit 'The size of the image must be 18 megabytes or larger'
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# Retrieve the first unused loop device name
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loopdev=$(losetup -f)
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# Retrieve an appropriate name for the container
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container="${loopdev/*\/}"
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# Exit with an error if a container already exists with this name
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[[ ! -e "/dev/mapper/$container" ]] || error_exit "A container already exists at ${c_m}/dev/mapper/$container"
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# Create the image file at the requested size and filled with random data
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dd bs=1M count="$size" if=/dev/urandom of="$filename" || error_exit "Unable to create ${c_m}$filename"
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# Setup the loop device
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losetup "$loopdev" "$filename" || error_exit "Unable to connect ${c_m}$filename${c_w} to the loop device ${c_m}$loopdev"
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# Initialize encryption on the image
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while (( 1 )); do
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if cryptsetup -c aes-xts-plain64 -y -s 512 luksFormat "$loopdev"; then
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break
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else
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printf '%s' "${c_w}Failed to encrypt the image, press return to try again or ctrl+c to exit$c_c"
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read -r
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fi
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done
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# Decrypt the image so we can use it
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luks_open "$loopdev" "$container"
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# Initialize the target filesystem on the device
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mkfs -t "$filesystem" "/dev/mapper/${container}" || error_exit "Unable to create the ${c_m}$filesystem${c_w} filesystem"
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sync
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# Close the decrypted image
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luks_close "$loopdev" "$container"
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}
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function mount_image {
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# Exit with an error if exactly 3 arguments haven't been given
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[[ -n "$2" && -z "$3" ]] || error_exit 'Incorrect number of arguments for the create command'
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# Store the provided arguments as named variables so they're easier to keep track of
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filename="$1"
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mountpoint="$2"
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# Exit with an error if either the image file or mount point do not exist
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[[ ! -f "$filename" ]] && error_exit "${c_m}$filename${c_w} does not exist"
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[[ -e "$mountpoint" ]] || error_exit "${c_m}$mountpoint${c_w} does not exist"
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[[ -d "$mountpoint" ]] || error_exit "${c_m}$mountpoint${c_w} is not a directory"
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# Retrieve the first unused loop device name
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loopdev=$(losetup -f)
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# Retrieve an appropriate name for the container
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container="${loopdev/*\/}"
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# Exit with an error if a container already exists with this name
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[[ ! -e "/dev/mapper/$container" ]] || error_exit "A container already exists at ${c_m}/dev/mapper/$container"
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# Setup the loop device
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losetup "$loopdev" "$filename" || error_exit "Unable to connect ${c_m}$filename${c_w} to the loop device ${c_m}$loopdev${c_w}"
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# Decrypt the image so we can use it
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luks_open "$loopdev" "$container"
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# Mount the mapped decrypted image
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mount "/dev/mapper/$container" "$mountpoint" || error_exit "Unable to mount ${c_m}/dev/mapper/${container}${c_w} on ${c_m}$mountpoint"
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}
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function unmount_image {
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# Exit with an error if exactly 3 arguments haven't been given
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[[ -n "$1" && -z "$2" ]] || error_exit 'Incorrect number of arguments for the create command'
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# Store the the absolute path of the mount point
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mountpoint="$(readlink -f "$1")"
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# Exit with an error if the mount point does not exist or isn't a directory
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[[ -e "$mountpoint" ]] || error_exit "${c_m}$mountpoint${c_w} does not exist"
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[[ -d "$mountpoint" ]] || error_exit "${c_m}$mountpoint${c_w} is not a directory"
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# Check the list of mounts for the mount point
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mount=$(grep "$mountpoint" /proc/mounts)
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# Exit with an error if the mount point isn't in the list of mounts
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[[ -n "$mount" ]] || error_exit "${c_m}$mountpoint${c_w} is not mounted"
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# Retrieve the name of the container
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container_path="${mount/ *}"
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# Retrieve the loop device associated with the mount
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loopdev="${container_path/*\//\/dev\/}"
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# Exit with an error if the container_path doesn't exist
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[[ -e "$container_path" ]] || error_exit "The mount does not appear to be a decrypted container"
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# Unmount the mount point
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umount "$mountpoint" || error_exit "Unable to unmount ${c_m}$mountpoint"
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# Close the decrypted image
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luks_close "$loopdev" "${container_path/*\/}"
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}
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# Exit with an error on ctrl-c
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trap 'error_exit "$scriptname has been killed"' SIGINT SIGQUIT
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# Check for root
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[[ "$UID" -ne 0 ]] && errorquit "run with root permission\n"
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(( UID == 0 )) || error_exit 'Must be run with root permissions'
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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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# Dependencies
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deps=('dd' 'losetup' 'cryptsetup' 'mkfs')
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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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# Check for missing dependencies
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declare -a missing_deps=()
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if [ -z "$1" ]; then
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usage; exit 1
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elif [ ! "$1" = "c" -a ! "$1" = "m" -a ! "$1" = "u" ]; then
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errorquit "syntax"
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fi
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for dep in "${deps[@]}"; do
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type -P "$dep" >/dev/null \
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|| missing_deps=( "${missing_deps[@]}" "$dep" )
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done
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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 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="$2" || errorquit "couldn't create create image file"
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losetup "$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 (${LOOPDEV})"
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[[ -n "${missing_deps[*]}" ]] && {
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error_exit "${c_w}missing dependencies ($(
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for (( x=0; x < ${#missing_deps[@]}; x++ )); do
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printf '%s' "$c_m${missing_deps[$x]}$c_c"
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(( (( x + 1 )) < ${#missing_deps[@]} )) && printf '%s' ', '
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done
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)$c_w)"
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}
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# Load the required modules if not already available
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modules=('loop' 'dm_mod')
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for module in "${modules[@]}"; do
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modinfo "$module" >/dev/null 2>&1 || {
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printf '%s ' "${c_w}Loading module: ${c_m}$module${c_w}..."
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if modprobe "$module" >/dev/null 2>&1; then
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printf '%s\n' "${c_g}done!${c_c}"
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else
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printf '%s\n' "${c_r}failed!${c_c}"
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error_exit "Unable to load module ${c_m}$module"
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fi
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}
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done
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# Store the option and then drop it from the list of arguments
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option="$1"
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shift
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# Run the appropriate function based on the provided option
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case "$option" in
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c|-c|--create)
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create_image "$@"
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;;
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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" "$2" || errorquit "couldn't setup loop device (${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 $3"
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m|-m|--mount)
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mount_image "$@"
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;;
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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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[[ -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 (${LOOPDEV})"
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u|-u|--unmount)
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unmount_image "$@"
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;;
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generic)
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usage
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h|-h|--help)
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usage 0
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;;
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*)
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usage 1
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;;
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esac
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