#!/bin/bash
#
# .---.                  .              .
# |                      |              |
# |--- .--. .-.  .-.  .-.|  .-. .--.--. |.-.  .-. .--.  .-.
# |    |   (.-' (.-' (   | (   )|  |  | |   )(   )|  | (.-'
# '    '     --'  --'  -' -  -' '  '   -' -'   -' '   -  --'
#
#                    Freedom in the Cloud
#
# Backup to remote servers - the web of backups

# 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/>.

PROJECT_NAME='freedombone'
COMPLETION_FILE=$HOME/${PROJECT_NAME}-completed.txt

export TEXTDOMAIN=${PROJECT_NAME}-backup-local
export TEXTDOMAINDIR="/usr/share/locale"

# Temporary location for data to be backed up to other servers
SERVER_DIRECTORY=/root/remotebackup

ADMIN_USERNAME=$(cat $COMPLETION_FILE | grep "Admin user" | awk -F ':' '{print $2}')
ADMIN_NAME=$(getent passwd $ADMIN_USERNAME | cut -d: -f5 | cut -d, -f1)
ADMIN_EMAIL_ADDRESS=${ADMIN_USERNAME}@${HOSTNAME}
if [ ! -f /etc/ssl/private/backup.key ]; then
    echo $"Creating backup key"
    freedombone-addcert -h backup --dhkey 2048
fi

if [ ! -f /home/${ADMIN_USERNAME}/backup.list ]; then
    exit 1
fi

# MariaDB password
DATABASE_PASSWORD=''
if [ -f /root/dbpass ]; then
    DATABASE_PASSWORD=$(cat /root/dbpass)
fi

# local directory where the backup will be made
if [ ! -d $SERVER_DIRECTORY ]; then
    mkdir $SERVER_DIRECTORY
fi

if [ ! -d $SERVER_DIRECTORY/backup ]; then
    mkdir -p $SERVER_DIRECTORY/backup
fi

function backup_directory_to_friend {
    BACKUP_KEY_EXISTS=$(gpg --list-keys "$ADMIN_NAME (backup key)")
    if [ ! "$?" = "0" ]; then
        echo $"Backup key could not be found"
        exit 43382
    fi
    ADMIN_BACKUP_KEY_ID=$(gpg --list-keys "$ADMIN_NAME (backup key)" | grep 'pub ' | awk -F ' ' '{print $2}' | awk -F '/' '{print $2}')
    obnam force-lock -r $SERVER_DIRECTORY/backup/${2} --encrypt-with $ADMIN_BACKUP_KEY_ID ${1}
    obnam backup -r $SERVER_DIRECTORY/backup/${2} --encrypt-with $ADMIN_BACKUP_KEY_ID ${1}
    obnam forget --keep=30d -r $SERVER_DIRECTORY/backup/${2} --encrypt-with $ADMIN_BACKUP_KEY_ID
    if [ ! "$?" = "0" ]; then
        if [[ ${1} == "/root/temp"* || ${1} == *"tempbackup" ]]; then
            shred -zu /root/temp${2}/*
            rm -rf /root/temp${2}
        fi
        # Send a warning email
        echo "Unable to backup ${2}" | mail -s "${PROJECT_NAME} backup to friends" $ADMIN_EMAIL_ADDRESS
        exit 853
    fi
    if [[ ${1} == "/root/temp"* || ${1} == *"tempbackup" ]]; then
        shred -zu /root/temp${2}/*
        rm -rf /root/temp${2}
    fi
}

function backup_database_to_friend {
    if [ ${#DATABASE_PASSWORD} -lt 2 ]; then
        echo $"No MariaDB password was given"
        exit 5783
    fi
    if [ ! -d $SERVER_DIRECTORY/backup/${1} ]; then
        mkdir -p $SERVER_DIRECTORY/backup/${1}
    fi
    if [ ! -d $SERVER_DIRECTORY/backup/${1}data ]; then
        mkdir -p $SERVER_DIRECTORY/backup/${1}data
    fi
    if [ ! -d /root/temp${1}data ]; then
        mkdir -p /root/temp${1}data
    fi
    echo "Obtaining ${1} database backup"
    mysqldump --password=$DATABASE_PASSWORD ${1} > /root/temp${1}data/${1}.sql
    if [ ! -s /root/temp${1}data/${1}.sql ]; then
        echo $"${1} database could not be saved"
        shred -zu /root/temp${1}data/*
        rm -rf /root/temp${1}data
        # Send a warning email
        echo $"Unable to export ${1} database" | mail -s $"${PROJECT_NAME} backup to friends" $ADMIN_EMAIL_ADDRESS
        exit 5738
    fi
}

# Backup user files
for d in /home/*/ ; do
    USERNAME=$(echo "$d" | awk -F '/' '{print $3}')
    if [[ $USERNAME != "git" ]]; then

        # personal settings
        if [ -d /home/$USERNAME/personal ]; then
            echo $"Backing up personal settings for $USERNAME"
            if [ ! -d $SERVER_DIRECTORY/backup/personal/$USERNAME ]; then
                mkdir -p $SERVER_DIRECTORY/backup/personal/$USERNAME
            fi
            backup_directory_to_friend /home/$USERNAME/personal personal/$USERNAME
        fi

        # gpg keys
        if [ -d /home/$USERNAME/.gnupg ]; then
            echo $"Backing up gpg keys for $USERNAME"
            if [ ! -d $SERVER_DIRECTORY/backup/gnupg/$USERNAME ]; then
                mkdir -p $SERVER_DIRECTORY/backup/gnupg/$USERNAME
            fi
            backup_directory_to_friend /home/$USERNAME/.gnupg gnupg/$USERNAME
        fi

        # ssh keys
        if [ -d /home/$USERNAME/.ssh ]; then
            echo $"Backing up ssh keys for $USERNAME"
            if [ ! -d $SERVER_DIRECTORY/backup/ssh/$USERNAME ]; then
                mkdir -p $SERVER_DIRECTORY/backup/ssh/$USERNAME
            fi
            backup_directory_to_friend /home/$USERNAME/.ssh ssh/$USERNAME
        fi

        # config files
        if [ -d /home/$USERNAME/.config ]; then
            echo $"Backing up config files for $USERNAME"
            if [ ! -d $SERVER_DIRECTORY/backup/config/$USERNAME ]; then
                mkdir -p $SERVER_DIRECTORY/backup/config/$USERNAME
            fi
            backup_directory_to_friend /home/$USERNAME/.config config/$USERNAME
        fi

        # mutt settings
        if [ -f /home/$USERNAME/.muttrc ]; then
            echo $"Backing up Mutt settings for $USERNAME"
            if [ ! -d /home/$USERNAME/tempbackup ]; then
                mkdir -p /home/$USERNAME/tempbackup
            fi
            cp /home/$USERNAME/.muttrc /home/$USERNAME/tempbackup
            if [ -f /etc/Muttrc ]; then
                cp /etc/Muttrc /home/$USERNAME/tempbackup
            fi
            if [ ! -d $SERVER_DIRECTORY/backup/mutt/$USERNAME ]; then
                mkdir -p $SERVER_DIRECTORY/backup/mutt/$USERNAME
            fi
            backup_directory_to_friend /home/$USERNAME/tempbackup mutt/$USERNAME
        fi

        # procmail settings
        if [ -f /home/$USERNAME/.procmailrc ]; then
            echo $"Backing up procmail settings for $USERNAME"
            if [ ! -d /home/$USERNAME/tempbackup ]; then
                mkdir -p /home/$USERNAME/tempbackup
            fi
            cp /home/$USERNAME/.procmailrc /home/$USERNAME/tempbackup
            if [ ! -d $SERVER_DIRECTORY/backup/procmail/$USERNAME ]; then
                mkdir -p $SERVER_DIRECTORY/backup/procmail/$USERNAME
            fi
            backup_directory_to_friend /home/$USERNAME/tempbackup procmail/$USERNAME
        fi

        # spamassassin settings
        if [ -d /home/$USERNAME/.spamassassin ]; then
            echo $"Backing up spamassassin settings for $USERNAME"
            if [ ! -d $SERVER_DIRECTORY/backup/spamassassin/$USERNAME ]; then
                mkdir -p $SERVER_DIRECTORY/backup/spamassassin/$USERNAME
            fi
            backup_directory_to_friend /home/$USERNAME/.spamassassin spamassassin/$USERNAME
        fi

        # email
        if [ -d /home/$USERNAME/Maildir ]; then
            echo $"Creating an email archive"
            if [ ! -d /root/backupemail/$USERNAME ]; then
                mkdir -p /root/backupemail/$USERNAME
            fi
            tar -czvf /root/backupemail/$USERNAME/maildir.tar.gz /home/$USERNAME/Maildir
            echo $"Backing up emails for $USERNAME"
            if [ ! -d $SERVER_DIRECTORY/backup/mail/$USERNAME ]; then
                mkdir -p $SERVER_DIRECTORY/backup/mail/$USERNAME
            fi
            backup_directory_to_friend /root/backupemail/$USERNAME mail/$USERNAME
        fi
    fi
done

# Backup Let's Encrypt
if [ -d /etc/letsencrypt ]; then
    echo $"Backing up Lets Encrypt settings"
    backup_directory_to_friend /etc/letsencrypt letsencrypt
fi

# Backup gnusocial
if grep -q "GNU Social domain" $COMPLETION_FILE; then
    MICROBLOG_DOMAIN_NAME=$(cat $COMPLETION_FILE | grep "GNU Social domain" | awk -F ':' '{print $2}')
    if [ -d /var/www/${MICROBLOG_DOMAIN_NAME} ]; then
        backup_database_to_friend gnusocial
        backup_directory_to_friend /root/tempgnusocialdata gnusocialdata
        echo $"Backing up GNU social installation"
        backup_directory_to_friend /var/www/${MICROBLOG_DOMAIN_NAME}/htdocs gnusocial
    else
        echo $"GNU Social domain specified but not found in /var/www/${MICROBLOG_DOMAIN_NAME}"
        exit 6327
    fi
fi

# backup hubzilla
if grep -q "Hubzilla domain" $COMPLETION_FILE; then
    HUBZILLA_DOMAIN_NAME=$(cat $COMPLETION_FILE | grep "Hubzilla domain" | awk -F ':' '{print $2}')
    if [ -d /var/www/${HUBZILLA_DOMAIN_NAME} ]; then
        backup_database_to_friend hubzilla
        backup_directory_to_friend /root/temphubzilladata hubzilladata
        echo "Backing up Hubzilla installation"
        backup_directory_to_friend /var/www/${HUBZILLA_DOMAIN_NAME}/htdocs hubzilla
    else
        echo $"Hubzilla domain specified but not found in /var/www/${HUBZILLA_DOMAIN_NAME}"
        exit 2578
    fi
fi

# backup owncloud
if [ -d /etc/owncloud ]; then
    if [ ! -d $SERVER_DIRECTORY/backup/owncloud2 ]; then
        mkdir -p $SERVER_DIRECTORY/backup/owncloud2
    fi
    backup_database_to_friend owncloud
    backup_directory_to_friend /root/tempownclouddata ownclouddata
    echo $"Backing up Owncloud data"
    backup_directory_to_friend /var/lib/owncloud owncloud
    backup_directory_to_friend /etc/owncloud owncloud2
fi

# backup gogs
if [ -d /home/git/go/src/github.com/gogits ]; then
    if [ ! -d $SERVER_DIRECTORY/backup/gogsrepos ]; then
        mkdir -p $SERVER_DIRECTORY/backup/gogsrepos
    fi
    if [ ! -d $SERVER_DIRECTORY/backup/gogsssh ]; then
        mkdir -p $SERVER_DIRECTORY/backup/gogsssh
    fi
    backup_database_to_friend gogs
    backup_directory_to_friend /root/tempgogsdata gogsdata
    echo $"Obtaining Gogs settings backup"
    backup_directory_to_friend /home/git/go/src/github.com/gogits/gogs/custom gogs
    echo $"Obtaining Gogs repos backup"
    mv /home/git/gogs-repositories/*.git /home/git/gogs-repositories/bob
    backup_directory_to_friend /home/git/gogs-repositories gogsrepos
    echo $"Obtaining Gogs authorized_keys backup"
    backup_directory_to_friend /home/git/.ssh gogsssh
fi

if [ -d /etc/dokuwiki ]; then
    if [ ! -d $SERVER_DIRECTORY/backup/wiki ]; then
        mkdir -p $SERVER_DIRECTORY/backup/wiki
    fi
    if [ ! -d $SERVER_DIRECTORY/backup/wiki2 ]; then
        mkdir -p $SERVER_DIRECTORY/backup/wiki2
    fi
    echo $"Backing up wiki"
    backup_directory_to_friend /var/lib/dokuwiki wiki
    backup_directory_to_friend /etc/dokuwiki wiki2
fi

# Backup blog
if grep -q "Blog domain" $COMPLETION_FILE; then
    FULLBLOG_DOMAIN_NAME=$(cat $COMPLETION_FILE | grep "Blog domain" | awk -F ':' '{print $2}')
    if [ -d /var/www/${FULLBLOG_DOMAIN_NAME} ]; then
        if [ ! -d $SERVER_DIRECTORY/backup/blog ]; then
            mkdir -p $SERVER_DIRECTORY/backup/blog
        fi
        echo $"Backing up blog"
        backup_directory_to_friend /var/www/${FULLBLOG_DOMAIN_NAME}/htdocs blog
    else
        echo $"Blog domain specified but not found in /var/www/${FULLBLOG_DOMAIN_NAME}"
        exit 2578
    fi
fi

# Backup certificates
if [ -d /etc/ssl ]; then
    echo $"Backing up certificates"
    if [ ! -d $SERVER_DIRECTORY/backup/ssl ]; then
        mkdir -p $SERVER_DIRECTORY/backup/ssl
    fi
    backup_directory_to_friend /etc/ssl ssl
fi

# Backup the public mailing list
if [ -d /var/spool/mlmmj ]; then
    echo $"Backing up the public mailing list"
    if [ ! -d $SERVER_DIRECTORY/backup/mailinglist ]; then
        mkdir -p $SERVER_DIRECTORY/backup/mailinglist
    fi
    backup_directory_to_friend /var/spool/mlmmj mailinglist
fi

# Backup xmpp settings
if [ -d /var/lib/prosody ]; then
    echo $"Backing up the XMPP settings"
    if [ ! -d $SERVER_DIRECTORY/backup/xmpp ]; then
        mkdir -p $SERVER_DIRECTORY/backup/xmpp
    fi
    backup_directory_to_friend /var/lib/prosody xmpp
fi

# Backup web sites
if [ -d /etc/nginx ]; then
    echo $"Backing up web settings"
    if [ ! -d $SERVER_DIRECTORY/backup/web ]; then
        mkdir -p $SERVER_DIRECTORY/backup/web
    fi
    backup_directory_to_friend /etc/nginx/sites-available web
fi

# Backup admin user README file
if [ -f /home/$ADMIN_USERNAME/README ]; then
    echo $"Backing up README"
    if [ ! -d $SERVER_DIRECTORY/backup/readme ]; then
        mkdir -p $SERVER_DIRECTORY/backup/readme
    fi
    if [ ! -d /home/$ADMIN_USERNAME/tempbackup ]; then
        mkdir -p /home/$ADMIN_USERNAME/tempbackup
    fi
    cp -f /home/$ADMIN_USERNAME/README /home/$ADMIN_USERNAME/tempbackup
    backup_directory_to_friend /home/$ADMIN_USERNAME/tempbackup readme
fi

# Backup IPFS
if [ -d /home/$ADMIN_USERNAME/.ipfs ]; then
    echo $"Backing up IPFS"
    if [ ! -d $SERVER_DIRECTORY/backup/ipfs ]; then
        mkdir -p $SERVER_DIRECTORY/backup/ipfs
    fi
    backup_directory_to_friend /home/$ADMIN_USERNAME/.ipfs ipfs
fi

# Backup DLNA cache
if [ -d /var/cache/minidlna ]; then
    echo $"Backing up DLNA cache"
    if [ ! -d $SERVER_DIRECTORY/backup/dlna ]; then
        mkdir -p $SERVER_DIRECTORY/backup/dlna
    fi
    backup_directory_to_friend /var/cache/minidlna dlna
fi

# Backup VoIP settings
if [ -f /etc/mumble-server.ini ]; then
    echo $"Backing up VoIP settings"
    if [ ! -d /root/tempvoipbackup ]; then
        mkdir -p /root/tempvoipbackup
    fi
    cp -f /etc/mumble-server.ini /root/tempvoipbackup
    cp -f /var/lib/mumble-server/mumble-server.sqlite /root/tempvoipbackup
    cp -f /etc/sipwitch.conf /root/tempvoipbackup
    if [ ! -d $SERVER_DIRECTORY/backup/voip ]; then
        mkdir -p $SERVER_DIRECTORY/backup/voip
    fi
    backup_directory_to_friend /root/tempvoipbackup voip
fi

# Backup Tox node settings
if [ -d /var/lib/tox-bootstrapd ]; then
    echo "Backing up Tox node settings"
    if [ ! -d $SERVER_DIRECTORY/backup/tox ]; then
        mkdir -p $SERVER_DIRECTORY/backup/tox
    fi
    if [ -d /var/lib/tox-bootstrapd/Maildir ]; then
        rm -rf /var/lib/tox-bootstrapd/Maildir
    fi
    cp /etc/tox-bootstrapd.conf /var/lib/tox-bootstrapd
    backup_directory_to_friend /var/lib/tox-bootstrapd tox
fi

# MariaDB settings
if [ ${#DATABASE_PASSWORD} -gt 1 ]; then
    if [ ! -d $SERVER_DIRECTORY/backup/mariadb ]; then
        mkdir -p $SERVER_DIRECTORY/backup/mariadb
    fi
    if [ ! -d /root/tempmariadb ]; then
        mkdir /root/tempmariadb
    fi
    mysqldump --password=$DATABASE_PASSWORD mysql user > /root/tempmariadb/mysql.sql
    if [ ! -s /root/tempmariadb/mysql.sql ]; then
        echo $"Unable to backup MariaDB settings"
        rm -rf /root/tempmariadb
        # Send a warning email
        echo $"Unable to export database settings" | mail -s "${PROJECT_NAME} backup to friends" $ADMIN_EMAIL_ADDRESS
        exit 653
    fi
    echo "$DATABASE_PASSWORD" > /root/tempmariadb/db
    chmod 400 /root/tempmariadb/db
    backup_directory_to_friend /root/tempmariadb mariadb
fi

# 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 [ $REMOTE_SERVER ]; then
        REMOTE_DOMAIN=$(echo "${remote_server}" | awk -F ':' '{print $1}' | awk -F '@' '{print $2}')
        REMOTE_SSH_PORT=$(echo "${remote_server}" | awk -F ' ' '{print $2}')
        REMOTE_PASSWORD=$(echo "${remote_server}" | awk -F ' ' '{print $3}')
        NOW=$(date +"%Y-%m-%d %H:%M:%S")

        echo "$NOW Starting backup to $REMOTE_SERVER" >> /var/log/remotebackups.log

        # Social key management
		for d in /home/*/ ; do
			USERNAME=$(echo "$d" | awk -F '/' '{print $3}')
			if [[ $USERNAME != "git" ]]; then
				if [ -d /home/$USERNAME/.gnupg_fragments ]; then
					if [ $REMOTE_DOMAIN ]; then
						cd /home/$USERNAME/.gnupg_fragments
						no_of_shares=$(ls -afq keyshare.asc.* | wc -l)
						if (( no_of_shares > 0 )); then
							# Pick a share index based on the domain name
							# This ensures that the same share is always given to the same domain
							sharenumstr=$(md5sum <<< "$REMOTE_DOMAIN")
							share_index=$(echo $((0x${sharenumstr%% *} % ${no_of_shares})) | tr -d -)

							# get the share filename
							share_files=(/home/$USERNAME/.gnupg_fragments/keyshare.asc.*)
							share_filename=${share_files[share_index]}

							# create a temp directory containing the share
							mkdir -p /home/$USERNAME/tempkey/.gnupg_fragments_$USERNAME
							cp $share_filename /home/$USERNAME/tempkey/.gnupg_fragments_$USERNAME/

							# copy the fragments directory to the remote server
							/usr/bin/sshpass -p $REMOTE_PASSWORD scp -r -P $REMOTE_SSH_PORT /home/$USERNAME/tempkey/.gnupg_fragments_$USERNAME $REMOTE_SERVER
							if [ ! "$?" = "0" ]; then
								# Send a warning email
								echo "Key share to $REMOTE_SERVER failed" | mail -s "${PROJECT_NAME} social key management" $MY_EMAIL_ADDRESS
							fi

							# remove the temp file/directory
							shred -zu /home/$USERNAME/tempkey/.gnupg_fragments_$USERNAME/*
							rm -rf /home/$USERNAME/tempkey

							# Send a confirmation email
							echo "Key shared to $REMOTE_SERVER" | mail -s "${PROJECT_NAME} social key management" $MY_EMAIL_ADDRESS
						fi
					fi
				fi
			fi
		done

        rsync -ratlzv --rsh="/usr/bin/sshpass -p $REMOTE_PASSWORD ssh -p $REMOTE_SSH_PORT -o StrictHostKeyChecking=no" $SERVER_DIRECTORY/backup $REMOTE_SERVER
        if [ ! "$?" = "0" ]; then
            echo "$NOW Backup to $REMOTE_SERVER failed" >> /var/log/remotebackups.log
            # Send a warning email
            echo "Backup to $REMOTE_SERVER failed" | mail -s "${PROJECT_NAME} backup to friends" $ADMIN_EMAIL_ADDRESS
        else
            echo "$NOW Backed up to $REMOTE_SERVER" >> /var/log/remotebackups.log
        fi
    fi

done < /home/${ADMIN_USERNAME}/backup.list

exit 0