#!/bin/sh
##
# Copyright (C) 2013-2014 Janek Bevendorff
# Website: http://www.refining-linux.org/
# 
# Add SSH key to a backup user for passwordless login
# 
# The MIT License (MIT)
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
##

if [ "$1" == "" ] || [ "$2" == "" ] || [ "$3" == "" ]; then
	. rs-version
	echo "Usage: $(basename $0) <remote host> <remote username> <ssh public key file>"
	exit
fi

. /etc/rs-backup/server-config

home_dir="${BACKUP_ROOT}/${1}-${2}"

mkdir -p "${home_dir}/.ssh"

# Add public key to authorized_keys file and restrict shell commands
echo -n "command=\"/usr/bin/rs-run-ssh-cmd '${home_dir}'\" " >> "${home_dir}/.ssh/authorized_keys"
cat "$3" >> "${home_dir}/.ssh/authorized_keys"

# Protect SSH config by assigning ownership to root
chown -R root:root "${home_dir}/.ssh"
chmod 0755 "${home_dir}/.ssh"
chmod 0644 "${home_dir}/.ssh/authorized_keys"