rpi-auth

#!/bin/bash 
set -e   # fail on error

###
# #%L
# **********************************************************************
# PROJECT       :  rpi-scripts
# FILENAME      :  rpi-auth
# **********************************************************************
# 
# Copyright (C) 2015 Robert Savage
# 
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
# 
#      http://www.apache.org/licenses/LICENSE-2.0
# 
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# 
###

echo
echo "******************************************************"
echo "******************************************************"
echo "**                                                  **"
echo "**  THIS IS A CUSTOM SHELL SCRIPT FOR COPYING       **"
echo "**  YOUR LOCAL DEFAULT SSH PUBLIC KEY FILE TO       **"
echo "**  THE RASPBERRY PI AND CONFIGURING IT AS AN       **"
echo "**  AUTHORIZED SSH KEY FOR PASSWORD-LESS SSH        **"
echo "**  REMOTE ACCESS                                   **"
echo "**                                                  **"
echo "******************************************************"
echo "******************************************************"
echo

# set Raspberry Pi host address
USERNAME=pi
HOST=$1
PORT=$2

# validate that a host argument was provided
if [ -z $HOST ]; then 
	echo "-------------------------------"
	echo " MISSING RASPBERRY PI HOST ARG"
	echo "-------------------------------"
	echo "SYNTAX: ./rpi-auth {pi-host-address}"
	echo
	exit
fi

# allow custom port argument
if [ -z $PORT ]; then 
	PORT=22
fi

# display host information to user
echo "------------------------------"
echo " TARGET RASPBERRY PI HOST:    "
echo "------------------------------"
echo " ADDRESS : $HOST"
echo " PORT    : $PORT"

# copy the local SSH public key to the Raspberry Pi
echo
echo "------------------------------"
echo " COPY .SSH/ID_RSA.PUB TO PI   "
echo "------------------------------"
echo "(Note: You may need to enter the default Raspberry Pi password below if prompted)"
scp -P $PORT ~/.ssh/id_rsa.pub $USERNAME@$HOST:authrorized_key

# SSH to the Raspberry Pi to complete the authorized_keys config
echo
echo "------------------------------"
echo " APPPEND SSH KEY TO AUTH KEYS "
echo "------------------------------"
echo "(Note: You may need to enter the default Raspberry Pi password below if prompted)"
ssh -p $PORT $USERNAME@$HOST bash -c "'
mkdir -p ~/.ssh
cat ~/authrorized_key >> ~/.ssh/authorized_keys
rm ~/authrorized_key
'"
# SSH to the Raspberry Pi to complete the authorized_keys config
echo
echo "------------------------------"
echo " FINISHED "
echo "------------------------------"
echo