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#!/bin/bash
#
# .---. . .
# | | |
# |--- .--. .-. .-. .-.| .-. .--.--. |.-. .-. .--. .-.
# | | (.-' (.-' ( | ( )| | | | )( )| | (.-'
# ' ' --' --' -' - -' ' ' -' -' -' ' - --'
#
# Freedom in the Cloud
#
# Makes a USB drive containing a gpg key fragment
#
# License
# =======
#
# Copyright (C) 2015-2016 Bob Mottram <bob@freedombone.net>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
PROJECT_NAME='freedombone'
export TEXTDOMAIN=${PROJECT_NAME}-keydrive
export TEXTDOMAINDIR="/usr/share/locale"
USB_DRIVE=/dev/sdb1
USB_MOUNT=/mnt/usb
KEY_FRAGMENTS=3
FRAGMENTS_DIR=$USB_MOUNT/.gnupg_fragments
MY_USERNAME=$USER
MASTER_DRIVE="no"
FORMAT="no"
function show_help {
echo ''
echo $"${PROJECT_NAME}-keydrive -u [username] -d [device, eg. sdb] --master [yes/no] -n [no of fragments] --format [yes/no]"
echo ''
exit 0
}
while [[ $# > 1 ]]
do
key="$1"
case $key in
-h|--help)
show_help
;;
-u|--user)
shift
MY_USERNAME="$1"
;;
-d|--dev)
shift
USB_DRIVE=/dev/${1}1
;;
-m|--master)
shift
MASTER_DRIVE="$1"
;;
-n|--fragments)
shift
KEY_FRAGMENTS=$1
;;
-f|--format)
shift
FORMAT="yes"
;;
*)
# unknown option
;;
esac
shift
done
if [ ! $MY_USERNAME ]; then
echo $'No username given'
exit 69350
fi
if [ ! -d /home/$MY_USERNAME ]; then
echo $"Home directory for $MY_USERNAME not found. This user may not exist on the system"
exit 72378
fi
if [ ! -b $USB_DRIVE ]; then
echo $'Please attach a USB drive'
exit 65743
fi
umount -f $USB_MOUNT
if [ ! -d $USB_MOUNT ]; then
mkdir $USB_MOUNT
fi
if [ -f /dev/mapper/encrypted_usb ]; then
rm -rf /dev/mapper/encrypted_usb
fi
cryptsetup luksClose encrypted_usb
# optionally format the drive
if [[ $FORMAT == "yes" ]]; then
${PROJECT_NAME}-format ${USB_DRIVE::-1}
if [ ! "$?" = "0" ]; then
exit 36823
fi
fi
cryptsetup luksOpen $USB_DRIVE encrypted_usb
if [ "$?" = "0" ]; then
USB_DRIVE=/dev/mapper/encrypted_usb
fi
mount $USB_DRIVE $USB_MOUNT
if [ ! "$?" = "0" ]; then
echo $"There was a problem mounting the USB drive to $USB_MOUNT"
rm -rf $USB_MOUNT
exit 78543
fi
# optionally create a master drive which contains the full GPG keyring
if [[ $MASTER_DRIVE == "yes" || $MASTER_DRIVE == "y" || $MASTER_DRIVE == "1" ]]; then
if [ ! -d /home/$MY_USERNAME/.gnupg ]; then
echo $"No .gnupg directory was found for $MY_USERNAME"
umount -f $USB_MOUNT
rm -rf $USB_MOUNT
exit 73025
fi
cp -rf /home/$MY_USERNAME/.gnupg $USB_MOUNT
if [ -d /etc/letsencrypt ]; then
cp -rf /etc/letsencrypt $USB_MOUNT
echo $"LetsEncrypt keys copied to $USB_DRIVE"
fi
if [ -d $USB_MOUNT/.gnupg ]; then
echo $"GPG Keyring copied to $USB_DRIVE. You may now remove the drive."
else
echo $"Unable to copy gpg keyring to $USB_DRIVE"
fi
umount -f $USB_MOUNT
rm -rf $USB_MOUNT
exit 0
fi
# Don't use the USB drive if it already contains a full keyring
if [ -d $USB_MOUNT/.gnupg ]; then
echo $'A full GPG keyring already exists on the USB drive.'
echo $'Either reformat the USB drive or use a different drive.'
umount -f $USB_MOUNT
rm -rf $USB_MOUNT
exit 3392
fi
# Append the username as a subdirectory.
# This has a down side in that it does identify a given fragment
# as belonging to a given user, but has the convenience upside
# of being able to carry key fragments for multiple friends on
# the same USB drive
FRAGMENTS_DIR=$FRAGMENTS_DIR/$MY_USERNAME
# make a directory to contain the fragments
if [ ! -d $FRAGMENTS_DIR ]; then
mkdir -p $FRAGMENTS_DIR
echo $"Made directory $FRAGMENTS_DIR"
fi
if [ ! -d $FRAGMENTS_DIR ]; then
echo $"There was a problem making the directory $FRAGMENTS_DIR"
umount -f $USB_MOUNT
rm -rf $USB_MOUNT
exit 6843
fi
cd $FRAGMENTS_DIR
no_of_usb_shares=$(ls -afq keyshare.asc.* | wc -l)
if [ ! "$?" = "0" ]; then
no_of_usb_shares=0
fi
if (( no_of_usb_shares > 0 )); then
echo $"A key fragment already exists on the drive for the user $MY_USERNAME"
cd ~/
umount -f $USB_MOUNT
rm -rf $USB_MOUNT
exit 58945
fi
# copy a random fragment to the drive
LOCAL_FRAGMENTS_DIR=/home/$MY_USERNAME/.gnupg_fragments
if [ ! -d $LOCAL_FRAGMENTS_DIR ]; then
${PROJECT_NAME}-splitkey -u $MY_USERNAME -n $KEY_FRAGMENTS
fi
cd $LOCAL_FRAGMENTS_DIR
no_of_local_shares=$(ls -afq keyshare.asc.* | wc -l)
if [ ! "$?" = "0" ]; then
no_of_local_shares=0
fi
if (( no_of_local_shares < 3 )); then
${PROJECT_NAME}-splitkey -u $MY_USERNAME -n $KEY_FRAGMENTS
cd $LOCAL_FRAGMENTS_DIR
no_of_local_shares=$(ls -afq keyshare.asc.* | wc -l)
if [ ! "$?" = "0" ]; then
no_of_local_shares=0
fi
fi
if (( no_of_local_shares < 3 )); then
echo $"Not enough key fragments available ${no_of_local_shares}"
cd ~/
umount -f $USB_MOUNT
rm -rf $USB_MOUNT
exit 63386
fi
share_files=($LOCAL_FRAGMENTS_DIR/keyshare.asc.*)
SHARE_FILENAME=${share_files[RANDOM % ${#share_files[@]}]}
cp -f $SHARE_FILENAME $FRAGMENTS_DIR
cd $FRAGMENTS_DIR
no_of_usb_shares=$(ls -afq keyshare.asc.* | wc -l)
echo $"Number of fragments on the drive: ${no_of_usb_shares}"
if (( no_of_usb_shares > 1 )); then
echo $"Too many key fragments exist in $FRAGMENTS_DIR"
ls $FRAGMENTS_DIR
cd ~/
umount -f $USB_MOUNT
rm -rf $USB_MOUNT
exit 54292
fi
if (( no_of_usb_shares <= 0 )); then
echo $"There was a problem copying the key fragment to $USB_DRIVE"
echo $"Files found: ${no_of_usb_shares}"
ls $FRAGMENTS_DIR
cd ~/
umount -f $USB_MOUNT
rm -rf $USB_MOUNT
exit 54292
fi
cd ~/
umount -f $USB_MOUNT
rm -rf $USB_MOUNT
echo $"Key fragment copied to $USB_DRIVE. You may now remove the drive."
exit 0