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freedombone/src/freedombone-recoverkey

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#!/bin/bash
#
# .---. . .
# | | |
# |--- .--. .-. .-. .-.| .-. .--.--. |.-. .-. .--. .-.
# | | (.-' (.-' ( | ( )| | | | )( )| | (.-'
# ' ' --' --' -' - -' ' ' -' -' -' ' - --'
#
# Freedom in the Cloud
#
# A script which recovers a user's gpg key from a number of fragments
# License
# =======
#
# Copyright (C) 2015 Bob Mottram <bob@robotics.uk.to>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
FRIENDS_SERVERS_LIST=
MY_USERNAME=
GPG_USB_DRIVE='sdb1'
function show_help {
echo ''
echo 'freedombone-recoverkey -u [username] -d [drive]'
echo ' -l [friends servers list filename]'
echo ''
exit 0
}
while [[ $# > 1 ]]
do
key="$1"
case $key in
-h|--help)
show_help
;;
-u|--user)
shift
MY_USERNAME="$1"
;;
# backup list filename
# typically /home/$USER/backup.list
-l|--list)
shift
FRIENDS_SERVERS_LIST="$1"
;;
-d|--drive)
shift
GPG_USB_DRIVE=/dev/${1}1
;;
*)
# unknown option
;;
esac
shift
done
if [ ! $MY_USERNAME ]; then
show_help
fi
if [ ! -d /home/$MY_USERNAME ]; then
echo "User $MY_USERNAME does not exist on the system"
exit 7270
fi
if [ ! $MY_USERNAME ]; then
echo 'No username given'
exit 3578
fi
if [ ! -d /home/$MY_USERNAME ]; then
echo "User $MY_USERNAME does not exist on the system"
exit 7270
fi
FRAGMENTS_DIR=/home/$MY_USERNAME/.gnupg_fragments
function reconstruct_key {
if [ ! -d /home/$MY_USERNAME/.gnupg_fragments ]; then
return
fi
cd /home/$MY_USERNAME/.gnupg_fragments
no_of_shares=$(ls -afq keyshare.asc.* | wc -l)
if (( no_of_shares < 4 )); then
dialog --title "Encryption keys" --msgbox 'Not enough fragments to reconstruct the key' 6 70
exit 7348
fi
apt-get -y install libgfshare-bin gnupg
gfcombine /home/$MY_USERNAME/.gnupg_fragments/keyshare*
if [ ! "$?" = "0" ]; then
dialog --title "Encryption keys" --msgbox 'Unable to reconstruct the key' 6 70
exit 7348
fi
KEYS_FILE=/home/$MY_USERNAME/.gnupg_fragments/keyshare.asc
if [ ! -f $KEYS_FILE ]; then
dialog --title "Encryption keys" --msgbox 'Unable to reconstruct the key' 6 70
fi
su -c "gpg --allow-secret-key-import --import $KEYS_FILE" - $MY_USERNAME
if [ ! "$?" = "0" ]; then
echo 'Unable to import gpg key'
shred -zu $KEYS_FILE
rm -rf /home/$MY_USERNAME/.tempgnupg
exit 9654
fi
shred -zu $KEYS_FILE
dialog --title "Encryption keys" --msgbox 'Key has been reconstructed' 6 70
}
function interactive_gpg_from_usb {
dialog --title "Encryption keys" \
--msgbox 'Plug in a USB drive containing a copy of your full key or key fragment' 6 70
HOME_DIR=/home/$MY_USERNAME
GPG_LOADING="yes"
SSH_IMPORTED="no"
GPG_CTR=0
while [[ $GPG_LOADING == "yes" ]]
do
if [ ! -b $GPG_USB_DRIVE ]; then
GPG_USB_DRIVE='/dev/sdc1'
if [ ! -b $GPG_USB_DRIVE ]; then
GPG_USB_DRIVE='/dev/sdd1'
if [ ! -b $GPG_USB_DRIVE ]; then
if (( GPG_CTR > 0 )); then
reconstruct_key
return 0
fi
dialog --title "Encryption keys" --msgbox 'No USB drive found' 6 30
exit 27852
fi
fi
fi
GPG_USB_MOUNT='/mnt/usb'
umount -f $GPG_USB_MOUNT
if [ ! -d $GPG_USB_MOUNT ]; then
mkdir -p $GPG_USB_MOUNT
fi
if [ -f /dev/mapper/encrypted_usb ]; then
rm -rf /dev/mapper/encrypted_usb
fi
cryptsetup luksClose encrypted_usb
cryptsetup luksOpen $GPG_USB_DRIVE encrypted_usb
if [ "$?" = "0" ]; then
GPG_USB_DRIVE=/dev/mapper/encrypted_usb
fi
mount $GPG_USB_DRIVE $GPG_USB_MOUNT
if [ ! "$?" = "0" ]; then
if (( GPG_CTR > 0 )); then
rm -rf $GPG_USB_MOUNT
reconstruct_key
return 0
fi
dialog --title "Encryption keys" \
--msgbox "There was a problem mounting the USB drive to $GPG_USB_MOUNT" 6 70
rm -rf $GPG_USB_MOUNT
exit 74393
fi
if [ ! -d $GPG_USB_MOUNT/.gnupg ]; then
if [ ! -d $GPG_USB_MOUNT/.gnupg_fragments ]; then
if (( GPG_CTR > 0 )); then
umount -f $GPG_USB_MOUNT
rm -rf $GPG_USB_MOUNT
reconstruct_key
return 0
fi
dialog --title "Encryption keys" \
--msgbox "The directory $GPG_USB_MOUNT/.gnupg or $GPG_USB_MOUNT/.gnupg_fragments was not found" 6 70
umount -f $GPG_USB_MOUNT
rm -rf $GPG_USB_MOUNT
exit 723814
fi
fi
if [ -d $GPG_USB_MOUNT/.gnupg ]; then
if [ ! -d $HOME_DIR/.gnupg ]; then
mkdir $HOME_DIR/.gnupg
fi
cp -r $GPG_USB_MOUNT/.gnupg/* $HOME_DIR/.gnupg
GPG_LOADING="no"
dialog --title "Encryption keys" \
--msgbox "GPG Keyring loaded to $HOME_DIR" 6 70
else
if [ ! -d $HOME_DIR/.gnupg_fragments ]; then
mkdir $HOME_DIR/.gnupg_fragments
fi
cp -r $GPG_USB_MOUNT/.gnupg_fragments/* $HOME_DIR/.gnupg_fragments
fi
if [[ $SSH_IMPORTED == "no" ]]; then
if [ -d $GPG_USB_MOUNT/.ssh ]; then
if [ ! -d $HOME_DIR/.ssh ]; then
mkdir $HOME_DIR/.ssh
fi
cp $GPG_USB_MOUNT/.ssh/* $HOME_DIR/.ssh
dialog --title "Encryption keys" \
--msgbox "ssh keys imported" 6 70
SSH_IMPORTED="yes"
fi
fi
umount -f $GPG_USB_MOUNT
rm -rf $GPG_USB_MOUNT
if [[ $GPG_LOADING == "yes" ]]; then
dialog --title "Encryption keys" \
--msgbox "Now remove the USB drive. Insert the next drive containing a key fragment, or select Ok to finish" 6 70
fi
GPG_CTR=$((GPG_CTR + 1))
done
}
# if no remote backup list was given then assume recover from USB
if [ ! $FRIENDS_SERVERS_LIST ]; then
interactive_gpg_from_usb
exit 0
fi
# obtain shares/fragments from remote locations
if [ $FRIENDS_SERVERS_LIST ]; then
# For each remote server
while read remote_server
do
# Get the server and its password
# Format is:
# username@domain:/home/username <port number> <ssh password>
REMOTE_SERVER=$(echo "${remote_server}" | awk -F ' ' '{print $1}')
if [ $REMOTE_SERVER ]; then
REMOTE_SSH_PORT=$(echo "${remote_server}" | awk -F ' ' '{print $2}')
REMOTE_PASSWORD=$(echo "${remote_server}" | awk -F ' ' '{print $3}')
# create a directory if it doesn't exist
if [ ! -d /home/$MY_USERNAME/.gnupg_fragments ]; then
mkdir -p /home/$MY_USERNAME/.gnupg_fragments
fi
echo -n "Starting key retrieval from $REMOTE_SERVER..."
/usr/bin/sshpass -p $REMOTE_PASSWORD \
scp -r -P $REMOTE_SSH_PORT $REMOTE_SERVER/.gnupg_fragments/* /home/$MY_USERNAME/.gnupg_fragments
if [ ! "$?" = "0" ]; then
echo 'FAILED'
else
echo 'Ok'
fi
fi
done < $FRIENDS_SERVERS_LIST
fi
# was a directory created?
if [ ! -d $FRAGMENTS_DIR ]; then
echo 'No fragments have been recovered, so the key cannot be recovered'
exit 7483
fi
# was anything downloaded?
cd $FRAGMENTS_DIR
no_of_shares=$(ls -afq keyshare.asc.* | wc -l)
if (( no_of_shares == 0 )); then
echo 'No key fragments were retrieved'
exit 76882
fi
# set permissions on the fragments
chown -R $MY_USERNAME:$MY_USERNAME /home/$MY_USERNAME/.gnupg_fragments
# decrypt the file
KEYS_FILE=$FRAGMENTS_DIR/keyshare.asc
cd $FRAGMENTS_DIR
gfcombine $KEYS_FILE.*
if [ ! -f $KEYS_FILE ]; then
echo 'Unable to decrypt key. This may mean that not enough fragments are available'
exit 6283
fi
echo 'Key fragments recombined'
# import the gpg key
su -c "gpg --allow-secret-key-import --import $KEYS_FILE" - $MY_USERNAME
if [ ! "$?" = "0" ]; then
echo 'Unable to import gpg key'
shred -zu $KEYS_FILE
exit 3682
fi
shred -zu $KEYS_FILE
chown -R $MY_USERNAME:$MY_USERNAME /home/$MY_USERNAME/.gnupg
chmod -R 600 /home/$MY_USERNAME/.gnupg
echo 'GPG key was recovered'
exit 0
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