293 lines
11 KiB
Bash
Executable File
293 lines
11 KiB
Bash
Executable File
#!/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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# gpg functions
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#
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# License
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# =======
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#
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# Copyright (C) 2016-2017 Bob Mottram <bob@freedombone.net>
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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 Affero 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 Affero General Public License for more details.
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#
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# You should have received a copy of the GNU Affero General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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function gpg_update_mutt {
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key_username=$1
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if [ ! -f /home/$key_username/.muttrc ]; then
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return
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fi
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CURR_EMAIL_ADDRESS=$key_username@$HOSTNAME
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CURR_GPG_ID=$(gpg --homedir=/home/$key_username/.gnupg --list-keys $CURR_EMAIL_ADDRESS | sed -n '2p' | sed 's/^[ \t]*//')
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sed -i "s|set pgp_encrypt_only_command.*|set pgp_encrypt_only_command=\"/usr/lib/mutt/pgpewrap gpg --batch --quiet --no-verbose --output - --encrypt --textmode --armor --trust-model always --encrypt-to $CURR_GPG_ID -- -r %r -- %f\"|g" /home/$key_username/.muttrc
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sed -i "s|set pgp_encrypt_sign_command.*|set pgp_encrypt_sign_command=\"/usr/lib/mutt/pgpewrap gpg %?p?--passphrase-fd 0? --batch --quiet --no-verbose --textmode --output - --encrypt --sign %?a?-u %a? --armor --trust-model always --encrypt-to $CURR_GPG_ID -- -r %r -- %f\"|g" /home/$key_username/.muttrc
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chown $key_username:$key_username /home/$key_username/.muttrc
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}
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function gpg_import_public_key {
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key_username=$1
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key_filename=$2
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gpg --homedir=/home/$key_username/.gnupg --import $key_filename
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gpg_set_permissions $key_username
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}
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function gpg_import_private_key {
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key_username=$1
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key_filename=$2
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gpg --homedir=/home/$key_username/.gnupg --allow-secret-key-import --import $key_filename
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gpg_set_permissions $key_username
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}
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function gpg_export_public_key {
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key_username=$1
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key_id=$2
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key_filename=$3
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chown -R $key_username:$key_username /home/$key_username/.gnupg
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su -m root -c "gpg --homedir /home/$key_username/.gnupg --output $key_filename --armor --export $key_id" - $key_username
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}
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function gpg_export_private_key {
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key_username=$1
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key_id=$2
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key_filename=$3
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chown -R $key_username:$key_username /home/$key_username/.gnupg
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su -m root -c "gpg --homedir=/home/$key_username/.gnupg --armor --output $key_filename --export-secret-key $key_id" - $key_username
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}
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function gpg_create_key {
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key_username=$1
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key_passphrase=$2
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gpg_dir=/home/$key_username/.gnupg
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echo 'Key-Type: eddsa' > /home/$key_username/gpg-genkey.conf
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echo 'Key-Curve: Ed25519' >> /home/$key_username/gpg-genkey.conf
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echo 'Subkey-Type: eddsa' >> /home/$key_username/gpg-genkey.conf
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echo 'Subkey-Curve: Ed25519' >> /home/$key_username/gpg-genkey.conf
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echo "Name-Real: $MY_NAME" >> /home/$key_username/gpg-genkey.conf
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echo "Name-Email: $MY_EMAIL_ADDRESS" >> /home/$key_username/gpg-genkey.conf
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echo 'Expire-Date: 0' >> /home/$key_username/gpg-genkey.conf
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cat /home/$key_username/gpg-genkey.conf
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if [ $key_passphrase ]; then
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echo "Passphrase: $key_passphrase" >> /home/$key_username/gpg-genkey.conf
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else
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echo "Passphrase: $PROJECT_NAME" >> /home/$key_username/gpg-genkey.conf
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fi
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chown $key_username:$key_username /home/$key_username/gpg-genkey.conf
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echo $'Generating a new GPG key'
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su -m root -c "gpg --homedir /home/$key_username/.gnupg --batch --full-gen-key /home/$key_username/gpg-genkey.conf" - $key_username
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chown -R $key_username:$key_username /home/$key_username/.gnupg
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KEY_EXISTS=$(gpg_key_exists "$key_username" "${key_username}@${HOSTNAME}")
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if [[ $KEY_EXISTS == "no" ]]; then
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echo $"A GPG key for ${key_username}@${HOSTNAME} could not be created"
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exit 63621
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fi
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shred -zu /home/$key_username/gpg-genkey.conf
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CURR_GPG_PUBLIC_KEY_ID=$(gpg_pubkey_from_email "$key_username" "${key_username}@${HOSTNAME}")
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if [ ${#CURR_GPG_PUBLIC_KEY_ID} -lt 4 ]; then
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echo $"GPG public key ID could not be obtained for ${key_username}@${HOSTNAME}"
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exit 825292
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fi
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gpg_set_permissions $key_username
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}
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function gpg_delete_key {
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key_username=$1
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key_id=$2
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chown -R $key_username:$key_username /home/$key_username/.gnupg
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su -c "gpg --batch --quiet --homedir=/home/$key_username/.gnupg --delete-secret-key $key_id" - $key_username
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su -c "gpg --batch --quiet --homedir=/home/$key_username/.gnupg --delete-key $key_id" - $key_username
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}
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function gpg_set_permissions {
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key_username=$1
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if [[ "$key_username" != 'root' ]]; then
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chmod 700 /home/$key_username/.gnupg
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chmod -R 600 /home/$key_username/.gnupg/*
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chown -R $key_username:$key_username /home/$key_username/.gnupg
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else
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chmod 700 /root/.gnupg
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chmod -R 600 /root/.gnupg/*
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chown -R $key_username:$key_username /root/.gnupg
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fi
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}
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function gpg_reconstruct_key {
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key_username=$1
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key_interactive=$2
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if [ ! -d /home/$key_username/.gnupg_fragments ]; then
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return
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fi
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cd /home/$key_username/.gnupg_fragments
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no_of_shares=$(ls -afq keyshare.asc.* | wc -l)
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if (( no_of_shares < 4 )); then
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if [ $key_interactive ]; then
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dialog --title $"Recover Encryption Keys" --msgbox $'Not enough fragments to reconstruct the key' 6 70
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else
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echo $'Not enough fragments to reconstruct the key'
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fi
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exit 7348
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fi
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gfcombine /home/$key_username/.gnupg_fragments/keyshare*
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if [ ! "$?" = "0" ]; then
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if [ $key_interactive ]; then
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dialog --title $"Recover Encryption Keys" --msgbox $'Unable to reconstruct the key' 6 70
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else
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echo $'Unable to reconstruct the key'
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fi
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exit 7348
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fi
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KEYS_FILE=/home/$key_username/.gnupg_fragments/keyshare.asc
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if [ ! -f $KEYS_FILE ]; then
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if [ $key_interactive ]; then
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dialog --title $"Recover Encryption Keys" --msgbox $'Unable to reconstruct the key' 6 70
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else
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echo $'Unable to reconstruct the key'
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fi
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exit 52852
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fi
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gpg --homedir=/home/$key_username/.gnupg --allow-secret-key-import --import $KEYS_FILE
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if [ ! "$?" = "0" ]; then
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shred -zu $KEYS_FILE
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rm -rf /home/$key_username/.tempgnupg
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if [ $key_interactive ]; then
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dialog --title $"Recover Encryption Keys" --msgbox $'Unable to import gpg key' 6 70
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else
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echo $'Unable to import gpg key'
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fi
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exit 96547
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fi
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shred -zu $KEYS_FILE
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gpg_set_permissions $key_username
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if [ $key_interactive ]; then
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dialog --title $"Recover Encryption Keys" --msgbox $'Key has been reconstructed' 6 70
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else
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echo $'Key has been reconstructed'
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fi
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}
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function gpg_agent_setup {
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gpg_username=$1
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if [[ $gpg_username == 'root' ]]; then
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if ! grep -q 'GPG_TTY' /root/.bashrc; then
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echo '' >> /root/.bashrc
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echo 'GPG_TTY=$(tty)' >> /root/.bashrc
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echo 'export GPG_TTY' >> /root/.bashrc
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fi
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if ! grep -q 'use-agent' /root/.gnupg/gpg.conf; then
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echo 'use-agent' >> /root/.gnupg/gpg.conf
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fi
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if ! grep -q 'pinentry-mode loopback' /root/.gnupg/gpg.conf; then
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echo 'pinentry-mode loopback' >> /root/.gnupg/gpg.conf
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fi
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if [ ! -f /root/.gnupg/gpg-agent.conf ]; then
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touch /root/.gnupg/gpg-agent.conf
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fi
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if ! grep -q 'allow-loopback-pinentry' /root/.gnupg/gpg-agent.conf; then
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echo 'allow-loopback-pinentry' >> /root/.gnupg/gpg-agent.conf
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fi
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echo RELOADAGENT | gpg-connect-agent
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else
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if ! grep -q 'GPG_TTY' /home/$gpg_username/.bashrc; then
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echo '' >> /home/$gpg_username/.bashrc
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echo 'GPG_TTY=$(tty)' >> /home/$gpg_username/.bashrc
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echo 'export GPG_TTY' >> /home/$gpg_username/.bashrc
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chown $gpg_username:$gpg_username /home/$gpg_username/.bashrc
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fi
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if ! grep -q 'use-agent' /home/$gpg_username/.gnupg/gpg.conf; then
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echo 'use-agent' >> /home/$gpg_username/.gnupg/gpg.conf
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fi
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if ! grep -q 'pinentry-mode loopback' /home/$gpg_username/.gnupg/gpg.conf; then
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echo 'pinentry-mode loopback' >> /home/$gpg_username/.gnupg/gpg.conf
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fi
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if [ ! -f /home/$gpg_username/.gnupg/gpg-agent.conf ]; then
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touch /home/$gpg_username/.gnupg/gpg-agent.conf
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fi
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if ! grep -q 'allow-loopback-pinentry' /home/$gpg_username/.gnupg/gpg-agent.conf; then
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echo 'allow-loopback-pinentry' >> /home/$gpg_username/.gnupg/gpg-agent.conf
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fi
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su -c "echo RELOADAGENT | gpg-connect-agent" - $gpg_username
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fi
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}
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function gpg_pubkey_from_email {
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key_owner_username=$1
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key_email_address=$2
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key_id=
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if [[ $key_owner_username != "root" ]]; then
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key_id=$(su -c "gpg --list-keys $key_email_address" - $key_owner_username | sed -n '2p' | sed 's/^[ \t]*//')
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else
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key_id=$(gpg --list-keys $key_email_address | sed -n '2p' | sed 's/^[ \t]*//')
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fi
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echo $key_id
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}
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function enable_email_encryption_at_rest {
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for d in /home/*/ ; do
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USERNAME=$(echo "$d" | awk -F '/' '{print $3}')
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if [[ $(is_valid_user "$USERNAME") == "1" ]]; then
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if grep -q '#| /usr/bin/gpgit.pl' /home/$USERNAME/.procmailrc; then
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sed -i 's@#| /usr/bin/gpgit.pl@| /usr/bin/gpgit.pl@g' /home/$USERNAME/.procmailrc
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sed -i 's|#:0 f|:0 f|g' /home/$USERNAME/.procmailrc
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fi
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fi
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done
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if grep -q '#| /usr/bin/gpgit.pl' /etc/skel/.procmailrc; then
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sed -i 's@#| /usr/bin/gpgit.pl@| /usr/bin/gpgit.pl@g' /etc/skel/.procmailrc
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sed -i 's|#:0 f|:0 f|g' /etc/skel/.procmailrc
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fi
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}
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function disable_email_encryption_at_rest {
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for d in /home/*/ ; do
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USERNAME=$(echo "$d" | awk -F '/' '{print $3}')
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if [[ $(is_valid_user "$USERNAME") == "1" ]]; then
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if ! grep -q '#| /usr/bin/gpgit.pl' /home/$USERNAME/.procmailrc; then
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sed -i 's@| /usr/bin/gpgit.pl@#| /usr/bin/gpgit.pl@g' /home/$USERNAME/.procmailrc
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sed -i 's|:0 f|#:0 f|g' /home/$USERNAME/.procmailrc
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fi
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fi
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done
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if ! grep -q '#| /usr/bin/gpgit.pl' /etc/skel/.procmailrc; then
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sed -i 's@| /usr/bin/gpgit.pl@#| /usr/bin/gpgit.pl@g' /etc/skel/.procmailrc
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sed -i 's|:0 f|#:0 f|g' /etc/skel/.procmailrc
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fi
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}
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# NOTE: deliberately no exit 0
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