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+#!/bin/bash
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+#
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+# .---. . .
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+# | | |
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+# |--- .--. .-. .-. .-.| .-. .--.--. |.-. .-. .--. .-.
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+# | | (.-' (.-' ( | ( )| | | | )( )| | (.-'
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+# ' ' --' --' -' - -' ' ' -' -' -' ' - --'
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+#
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+# Freedom in the Cloud
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+#
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+# A script which splits a user's gpg key into fragments which
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+# may then be shared
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+
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+# To get a random fragment
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+# get a random fragment
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+# fragment_files=($FRAGMENTS_DIR/*)
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+# FRAGMENT_FILE="${files[RANDOM % ${#files[@]}]}"
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+
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+# License
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+# =======
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+#
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+# Copyright (C) 2015 Bob Mottram <bob@robotics.uk.to>
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+#
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+# This program is free software: you can redistribute it and/or modify
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+# it under the terms of the GNU General Public License as published by
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+# the Free Software Foundation, either version 3 of the License, or
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+# (at your option) any later version.
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+#
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+# This program is distributed in the hope that it will be useful,
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+# but WITHOUT ANY WARRANTY; without even the implied warranty of
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+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+# GNU General Public License for more details.
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+#
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+# You should have received a copy of the GNU General Public License
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+# along with this program. If not, see <http://www.gnu.org/licenses/>.
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+
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+KEY_FRAGMENTS=3
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+MY_USERNAME=
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+MY_EMAIL_ADDRESS=
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+
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+function show_help {
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+ echo ''
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+ echo 'freedombone-splitkey -u [username] -n [number of fragments] -e [email address]'
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+ echo ''
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+ exit 0
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+}
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+
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+while [[ $# > 1 ]]
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+do
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+key="$1"
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+
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+case $key in
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+ -h|--help)
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+ show_help
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+ ;;
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+ -u|--user)
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+ shift
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+ MY_USERNAME="$1"
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+ ;;
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+ -n|--fragments)
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+ shift
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+ KEY_FRAGMENTS=$1
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+ ;;
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+ -e|--email)
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+ shift
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+ MY_EMAIL_ADDRESS=$1
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+ ;;
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+ *)
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+ # unknown option
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+ ;;
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+esac
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+shift
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+done
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+
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+if [ ! $MY_USERNAME ]; then
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+ show_help
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+fi
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+if [ ! -d /home/$MY_USERNAME ]; then
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+ echo "User $MY_USERNAME does not exist on the system"
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+ exit 7270
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+fi
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+
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+if [ ! -d /home/$MY_USERNAME/.gnupg ]; then
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+ echo 'No gpg key found'
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+ exit 5393
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+fi
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+
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+FRAGMENTS_DIR=/home/$MY_USERNAME/.gnupg_fragments
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+if [ -d $FRAGMENTS_DIR ]; then
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+ exit 0
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+fi
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+
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+# get the gpg key ID
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+if [ ! $MY_EMAIL_ADDRESS ]; then
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+ MY_EMAIL_ADDRESS=$MY_USERNAME@$HOSTNAME
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+fi
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+KEYID=$(su -c "gpg --list-keys $MY_EMAIL_ADDRESS | grep 'pub '" - \
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+ $MY_USERNAME | awk -F ' ' '{print $2}' | awk -F '/' '{print $2}')
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+
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+# create the key file
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+KEYS_FILE=/home/$MY_USERNAME/tempdatafile.asc
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+gpg --output /home/$MY_USERNAME/pubkey.txt --armor --export $KEYID
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+if [ ! "$?" = "0" ]; then
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+ echo "Unable to extract public key for $KEYID"
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+ exit 7835
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+fi
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+gpg --output /home/$MY_USERNAME/privkey.txt --armor --export-secret-key $KEYID
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+if [ ! "$?" = "0" ]; then
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+ echo "Unable to extract private key for $KEYID"
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+ exit 7823
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+fi
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+cat /home/$MY_USERNAME/pubkey.txt /home/$MY_USERNAME/privkey.txt > $KEYS_FILE
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+shred -zu /home/$MY_USERNAME/privkey.txt
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+shred -zu /home/$MY_USERNAME/pubkey.txt
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+
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+# encrypt the keys file with a passphrase
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+gpg --output $KEYS_FILE.gpg --symmetric $KEYS_FILE
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+if [ ! "$?" = "0" ]; then
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+ echo "Unable to encrypt the data prior to splitting"
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+ exit 7352
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+fi
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+shred -zu $KEYS_FILE
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+
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+# generate fragments
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+GPG_KEYS_SIZE_BYTES=$(wc -c <"$KEYS_FILE.gpg")
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+GPG_BYTES_PER_FRAGMENT=$((GPG_KEYS_SIZE_BYTES / KEY_FRAGMENTS))
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+GPG_BYTES_PER_FRAGMENT=$((GPG_BYTES_PER_FRAGMENT + 1))
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+mkdir -p $FRAGMENTS_DIR
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+echo "$GPG_BYTES_PER_FRAGMENT / $GPG_KEYS_SIZE_BYTES"
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+split --bytes=$GPG_BYTES_PER_FRAGMENT $KEYS_FILE.gpg $FRAGMENTS_DIR/data
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+#chown -R $MY_USERNAME:$MY_USERNAME $FRAGMENTS_DIR
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+#chmod -R 600 $FRAGMENTS_DIR
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+
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+# delete the keys file
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+shred -zu $KEYS_FILE.gpg
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+
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+echo "$KEY_FRAGMENTS key fragments created"
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+
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+exit 0
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Bob Mottram
9 年前