freedombone/src/freedombone-splitkey

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#!/bin/bash
#
# .---. . .
# | | |
# |--- .--. .-. .-. .-.| .-. .--.--. |.-. .-. .--. .-.
# | | (.-' (.-' ( | ( )| | | | )( )| | (.-'
# ' ' --' --' -' - -' ' ' -' -' -' ' - --'
#
# Freedom in the Cloud
#
# A script which splits a user's gpg key into fragments which
# may then be shared
# To get a random fragment
# get a random fragment
# fragment_files=($FRAGMENTS_DIR/*)
# FRAGMENT_FILE="${files[RANDOM % ${#files[@]}]}"
# License
# =======
#
# Copyright (C) 2015 Bob Mottram <bob@robotics.uk.to>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
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PROJECT_NAME='freedombone'
export TEXTDOMAIN=$PROJECT_NAME
export TEXTDOMAINDIR="/usr/share/locale"
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KEY_FRAGMENTS=3
MY_USERNAME=
MY_EMAIL_ADDRESS=
MY_NAME=
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function show_help {
echo ''
echo 'freedombone-splitkey -u [username] -n [number of fragments] -e [email address] --fullname [Full name]'
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echo ''
exit 0
}
while [[ $# > 1 ]]
do
key="$1"
case $key in
-h|--help)
show_help
;;
-u|--user)
shift
MY_USERNAME="$1"
;;
-n|--fragments)
shift
KEY_FRAGMENTS=$1
;;
-e|--email)
shift
MY_EMAIL_ADDRESS=$1
;;
--fullname)
shift
MY_NAME=$1
;;
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*)
# unknown option
;;
esac
shift
done
if [ ! $MY_USERNAME ]; then
show_help
fi
if [ ! -d /home/$MY_USERNAME ]; then
echo "User $MY_USERNAME does not exist on the system"
exit 7270
fi
if [ ! -d /home/$MY_USERNAME/.gnupg ]; then
echo 'No gpg key found'
exit 5393
fi
FRAGMENTS_DIR=/home/$MY_USERNAME/.gnupg_fragments
if [ -d $FRAGMENTS_DIR ]; then
exit 0
fi
# get the gpg key ID
if [ ! $MY_EMAIL_ADDRESS ]; then
MY_EMAIL_ADDRESS=$MY_USERNAME@$HOSTNAME
fi
KEYID=$(su -c "gpg --list-keys $MY_EMAIL_ADDRESS | grep 'pub '" - \
$MY_USERNAME | awk -F ' ' '{print $2}' | awk -F '/' '{print $2}')
if [ ${#KEYID} -lt 4 ]; then
echo "gpg key for $MY_EMAIL_ADDRESS was not found"
return 3682
fi
MY_BACKUP_KEY_ID=$(gpg --list-keys "$MY_NAME (backup key)" | \
grep 'pub ' | awk -F ' ' '{print $2}' | \
awk -F '/' '{print $2}')
if [ ${#MY_BACKUP_KEY_ID} -lt 4 ]; then
echo "gpg backup key for '$MY_NAME' was not found"
return 58213
fi
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# create the key file
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mkdir -p $FRAGMENTS_DIR
KEYS_FILE=$FRAGMENTS_DIR/keyshare.asc
gpg --output $FRAGMENTS_DIR/pubkey.txt --armor --export $KEYID
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if [ ! "$?" = "0" ]; then
echo "Unable to extract public key for $KEYID"
exit 7835
fi
gpg --output $FRAGMENTS_DIR/privkey.txt \
--armor --export-secret-key $KEYID
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if [ ! "$?" = "0" ]; then
echo "Unable to extract private key for $KEYID"
exit 7823
fi
gpg --output $FRAGMENTS_DIR/backup_pubkey.txt \
--armor --export $MY_BACKUP_KEY_ID
if [ ! "$?" = "0" ]; then
echo "Unable to extract backup public key for $MY_BACKUP_KEY_ID"
exit 62928
fi
gpg --output $FRAGMENTS_DIR/backup_privkey.txt \
--armor --export-secret-key $MY_BACKUP_KEY_ID
if [ ! "$?" = "0" ]; then
echo "Unable to extract backup private key for $MY_BACKUP_KEY_ID"
exit 13783
fi
cat $FRAGMENTS_DIR/pubkey.txt \
$FRAGMENTS_DIR/privkey.txt \
$FRAGMENTS_DIR/backup_pubkey.txt \
$FRAGMENTS_DIR/backup_privkey.txt > $KEYS_FILE
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shred -zu $FRAGMENTS_DIR/privkey.txt
shred -zu $FRAGMENTS_DIR/pubkey.txt
shred -zu $FRAGMENTS_DIR/backup_privkey.txt
shred -zu $FRAGMENTS_DIR/backup_pubkey.txt
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KEY_SHARES=$((KEY_FRAGMENTS * 2))
gfsplit -n $KEY_FRAGMENTS -m $KEY_SHARES $KEYS_FILE
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if [ ! "$?" = "0" ]; then
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echo "Unable to split the gpg key"
rm -rf $FRAGMENTS_DIR
if [ -f $KEYS_FILE ]; then
shred -zu $KEYS_FILE
fi
exit 63028
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fi
shred -zu $KEYS_FILE
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# set permissions
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chown -R $MY_USERNAME:$MY_USERNAME $FRAGMENTS_DIR
chmod -R 600 $FRAGMENTS_DIR
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echo "$KEY_SHARES key shares created"
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exit 0