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#!/bin/bash
# Copyright (c) 2015-2016 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
# Copyright (c) 2014 Laurent Ghigonis <laurent@gouloum.fr>.
#
# Permission to use, copy, modify, and distribute this software for any
# purpose with or without fee is hereby granted, provided that the above
# copyright notice and this permission notice appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
CT_FILE_SUFFIX=".ct"
CT_MAPPER_PREFIX="ct_"
trace() {
echo "[#] $*"
"$@"
}
die() {
echo "[!] $*" >&2
exit 1
}
yesno() {
[[ -t 0 ]] || return 0
local response
read -r -p "$1 [y/N] " response
[[ $response == [yY] ]] || exit 1
}
unwind() {
[[ $keep_open -eq 1 ]] && return
for i in {1..5}; do
echo -e "$(cut -d ' ' -f 2 /proc/mounts)" | fgrep -wq "$mount_path" || break
trace umount "$mount_path" && break
trace sleep $i
done
for i in {1..5}; do
trace cryptsetup luksClose "$mapper_name"
[[ $? -eq 0 || $? -eq 4 ]] && break
trace sleep $i
done
for i in {1..5}; do
[[ ! -d $mount_path ]] && break
trace rmdir "$mount_path" && break
trace sleep $i
done
keep_open=1
exit
}
initialize_container() {
# container_dir = /home/myuser/
container_dir="$(readlink -f "$(dirname "$1")")"
# container_path = /home/myuser/bla.ct
container_path="$container_dir/$(basename "$1" "$CT_FILE_SUFFIX")$CT_FILE_SUFFIX"
# mount_path = /home/myuser/bla/
mount_path="$(readlink -f "$container_dir/$(basename "$container_path" "$CT_FILE_SUFFIX")")"
# mapper_name = ct_home-myuser-bla
mapper_name="$CT_MAPPER_PREFIX$(echo -n "${mount_path:1}" | tr -C '[:graph:]' '_' | tr '/' '-')"
# mapper_path = /dev/mapper/ct_home-myuser-bla
mapper_path="/dev/mapper/$mapper_name"
trap unwind INT TERM EXIT
}
cmd_usage() {
cat <<-_EOF
Usage: $PROGRAM [ new | delete | open | close | list ] [arguments...]
$PROGRAM new container_path container_size[units_suffix]
$PROGRAM delete container_path
$PROGRAM open container_path
$PROGRAM close container_path
$PROGRAM list
_EOF
}
cmd_new() {
[[ $# -ne 2 ]] && die "Usage: $PROGRAM new container_path container_size[units_suffix]"
initialize_container "$1"
local container_size="$2"
[[ -e $mapper_path ]] && { keep_open=1; die "$container_path is already open"; }
[[ -e $container_path ]] && yesno "$container_path already exists. Are you sure you want to continue?"
rm -f "$container_path"
trace truncate -s "$container_size" "$container_path" || { trace rm -f "$container_path"; die "Could not create $container_path"; }
trace cryptsetup --cipher aes-xts-plain64 --key-size 512 --hash sha512 --iter-time 5000 --batch-mode luksFormat "$container_path" || { trace rm -f "$container_path"; die "Could not create LUKS volume on $container_path"; }
trace chown "${SUDO_UID:-$(id -u)}:${SUDO_GID:-$(id -g)}" "$container_path" || { trace rm -f "$container_path"; die "Could not set ownership of $container_path"; }
trace cryptsetup luksOpen "$container_path" "$mapper_name" || { trace rm -f "$container_path"; die "Could not open LUKS volume at $container_path"; }
trace mkfs.ext4 -q -E root_owner="${SUDO_UID:-$(id -u)}:${SUDO_GID:-$(id -g)}" "$mapper_path" || { trace rm -f "$container_path"; die "Could not format ext4 on the LUKS volume at $container_path"; }
echo "[+] Created new encrypted container at $container_path"
}
cmd_open() {
[[ $# -ne 1 ]] && die "Usage: $PROGRAM open container_path"
initialize_container "$1"
[[ -f $container_path ]] || { keep_open=1; die "$container_path does not exist or is not a regular file"; }
[[ -e $mapper_path ]] && { keep_open=1; die "$container_path is already open"; }
trace cryptsetup luksOpen "$container_path" "$mapper_name" || die "Could not open LUKS volume at $container_path"
trace mkdir -p "$mount_path" || die "Could not create $mount_path directory"
trace mount "$mapper_path" "$mount_path" || die "Could not mount $container_path to $mount_path"
keep_open=1
echo "[+] Opened $container_path at $mount_path"
}
cmd_close() {
[[ $# -ne 1 ]] && die "Usage: $PROGRAM close container_path"
initialize_container "$1"
keep_open=1
echo -e "$(cut -d ' ' -f 2 /proc/mounts)" | fgrep -wq "$mount_path" && { trace umount "$mount_path" || die "Could not unmount $mount_path"; }
trace cryptsetup luksClose "$mapper_name"
[[ $? -eq 0 || $? -eq 4 ]] || die "Could not close LUKS mapping $mapper_name"
[[ -d $mount_path ]] && { trace rmdir "$mount_path" || echo "[-] Non-fatal: could not remove $mount_path directory" >&2; }
echo "[+] Closed $container_path"
}
cmd_delete() {
[[ $# -ne 1 ]] && die "Usage: $PROGRAM delete container_path"
yesno "Are you sure you want to delete $1?"
cmd_close "$@"
rm "$container_path" || die "Could not delete $container_path"
echo "[+] Deleted $container_path"
}
cmd_list() {
[[ $# -ne 0 ]] && die "Usage: $PROGRAM list"
# shellcheck disable=SC2155
local mount_points="$(sed -n "s:^/dev/mapper/${CT_MAPPER_PREFIX}[^ ]* \\([^ ]\\+\\).*:\\1:p" /proc/mounts)"
[[ -n $mount_points ]] && echo -e "$mount_points" && return 0
return 1
}
cmd_auto() {
if [[ $# -eq 0 ]]; then
cmd_list "$@" || cmd_usage
elif [[ $# -eq 1 ]]; then
initialize_container "$1"
if [[ -e $mapper_path ]]; then
cmd_close "$@"
else
cmd_open "$@"
fi
else
cmd_usage "$@"
fi
}
PROGRAM="$(basename "$0")"
[[ $UID != 0 ]] && exec sudo -p "$PROGRAM must be run as root. Please enter the password for %u to continue: " "$(readlink -f "$0")" "$@"
case "$1" in
h|help|-h|--help) shift; cmd_usage "$@" ;;
n|new|create) shift; cmd_new "$@" ;;
d|del|delete) shift; cmd_delete "$@" ;;
c|close) shift; cmd_close "$@" ;;
l|list) shift; cmd_list "$@" ;;
o|open) shift; cmd_open "$@" ;;
*) cmd_auto "$@" ;;
esac
exit 0
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