120 lines
3.0 KiB
Plaintext
120 lines
3.0 KiB
Plaintext
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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 recovers a user's gpg key from a number of fragments
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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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function show_help {
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echo ''
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echo 'freedombone-recoverkey -u [username]'
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echo ''
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exit 0
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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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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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*)
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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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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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if [ ! $MY_USERNAME ]; then
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echo 'No username given'
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exit 3578
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fi
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if [ ! -d /home/$MY_USERNAME ]; then
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echo "User $MY_USERNAME does not exist on the system"
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exit 7270
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fi
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FRAGMENTS_DIR=/home/$MY_USERNAME/.gnupg_fragments
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if [ ! -d $FRAGMENTS_DIR ]; then
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echo 'No fragments have been recovered, so the key cannot be recovered'
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exit 7483
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fi
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# join the fragments
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if [ ! -d /home/$MY_USERNAME/.tempgnupg ]; then
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mkdir /home/$MY_USERNAME/.tempgnupg
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fi
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KEYS_FILE=/home/$MY_USERNAME/.tempgnupg/tempfile.asc
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cat $FRAGMENTS_DIR/data* > $KEYS_FILE.gpg
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if [ ! "$?" = "0" ]; then
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echo 'Unable to find key fragments'
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exit 8727
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fi
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# decrypt the file
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cd /home/$MY_USERNAME/.tempgnupg
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gpg -d $KEYS_FILE.gpg -o $KEYS_FILE
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if [ ! "$?" = "0" ]; then
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echo 'Unable to decrypt data. This may mean that not enough fragments are available'
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exit 6283
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fi
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shred -zu $KEYS_FILE.gpg
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if [ ! -f $KEYS_FILE ]; then
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echo 'Unable to find decrypted key file. This may mean that not enough fragments are available'
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exit 8358
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fi
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echo 'Key fragments decrypted'
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# import the gpg key
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su -c "gpg --allow-secret-key-import --import $KEYS_FILE" - $MY_USERNAME
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if [ ! "$?" = "0" ]; then
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echo 'Unable to import gpg key'
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shred -zu $KEYS_FILE
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rm -rf /home/$MY_USERNAME/.tempgnupg
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exit 3682
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fi
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shred -zu $KEYS_FILE
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chown -R $MY_USERNAME:$MY_USERNAME /home/$MY_USERNAME/.gnupg
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chmod -R 600 /home/$MY_USERNAME/.gnupg
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rm -rf /home/$MY_USERNAME/.tempgnupg
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echo 'GPG key was recovered'
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exit 0
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