user_authentication.sh

#!/bin/bash
# for centos user must first install epel-release, sshpass, and nmap (sshpass and nmap are available from epel-release for CENTOS)
# usage ./authMe2.sh [username] [password] [internalIP prefix]
# ./authMe2.sh azureuser Azure@123 10.2.1
# Script to deploy through HPC Servers the SSH-KEY Configuration

USER=$1
PASS=$2
IPPRE=$3
HEADNODE=`hostname`

mkdir -p .ssh
echo -e  'y\n' | ssh-keygen -f .ssh/id_rsa -t rsa -N ''

echo 'Host $IPPRE.*' >> .ssh/config
echo 'StrictHostKeyChecking no' >> .ssh/config
chmod 400 .ssh/config
chown $USER:$USER /home/$USER/.ssh/config

nmap -sn $IPPRE.* | grep $IPPRE. | awk '{print $5}' > nodeips.txt
for NAME in `cat nodeips.txt`
do
    sshpass -p $PASS ssh -o ConnectTimeout=2 $USER@$NAME 'hostname' >> nodenames.txt
done

NAMES=`cat nodenames.txt` #names from names.txt file
for NAME in $NAMES
do
    sshpass -p $PASS scp -o "StrictHostKeyChecking no" -o ConnectTimeout=2 /home/$USER/nodenames.txt $USER@$NAME:/home/$USER/
    sshpass -p $PASS ssh -o ConnectTimeout=2 $USER@$NAME "mkdir .ssh && chmod 700 .ssh"
    sshpass -p $PASS ssh -o ConnectTimeout=2 $USER@$NAME "echo -e  'y\n' | ssh-keygen -f .ssh/id_rsa -t rsa -N ''"
    sshpass -p $PASS ssh -o ConnectTimeout=2 $USER@$NAME 'touch /home/'$USER'/.ssh/config'
    sshpass -p $PASS ssh -o ConnectTimeout=2 $USER@$NAME 'echo "Host $IPPRE.*" >  /home/'$USER'/.ssh/config'
    sshpass -p $PASS ssh -o ConnectTimeout=2 $USER@$NAME 'echo StrictHostKeyChecking no >> /home/'$USER'/.ssh/config'
    sshpass -p $PASS ssh -o ConnectTimeout=2 $USER@$NAME 'chmod 400 /home/'$USER'/.ssh/config'
    cat .ssh/id_rsa.pub | sshpass -p $PASS ssh -o ConnectTimeout=2 $USER@$NAME 'cat >> .ssh/authorized_keys'
    sshpass -p $PASS scp -o "StrictHostKeyChecking no" -o ConnectTimeout=2 $USER@$NAME:/home/$USER/.ssh/id_rsa.pub .ssh/sub_node.pub
    
    for SUBNODE in `cat nodeips.txt`
    do
        sshpass -p $PASS ssh -o ConnectTimeout=2 $USER@$SUBNODE 'mkdir -p .ssh'
        cat .ssh/sub_node.pub | sshpass -p $PASS ssh -o ConnectTimeout=2 $USER@$SUBNODE 'cat >> .ssh/authorized_keys'
    done
    sshpass -p $PASS ssh -o ConnectTimeout=2 $USER@$NAME 'chmod 700 .ssh/'
    sshpass -p $PASS ssh -o ConnectTimeout=2 $USER@$NAME 'chmod 640 .ssh/authorized_keys'
done