newsshsetup.sh

#!/bin/bash
#this script installs and configures ssh server,generates a ssh key and adds the pub to the cfg
#should modify since generating pub/priv key on same machine is not a good idea
if [[ $EUID -ne 0 ]]; then  #if script is ran as root
	echo "This script must be run as root" 1>&2;
	echo "Exiting...";
	exit 1;
fi

apt-get install openssh-server ssh;
cp -a /etc/ssh/sshd_config /etc/ssh/sshd_config_backup;  #-a coz it saves attributes
sed -ie 's/Port 22/Port 25553/' /etc/ssh/sshd_config;
sed -ie 's/PermitRootLogin without-password/PermitRootLogin no/' /etc/ssh/sshd_config;
sed -ie 's/#PasswordAuthentication yes/PasswordAuthentication no/' /etc/ssh/sshd_config;
sed -ie 's/UsePAM yes/UsePAM no/' /etc/ssh/sshd_config;


echo "Enter name of private/public ssh key";
read key;

ssh-keygen -t rsa -N "" -f $key;  ##-N  no passhprase, -f file
mkdir /home/$SUDO_USER/.ssh;
touch /home/$SUDO_USER/.ssh/authorized_keys;
cat $key.pub > /home/$SUDO_USER/.ssh/authorized_keys;
chown $SUDO_USER:$SUDO_USER $key;
chown $SUDO_USER:$SUDO_USER $key.pub;
chown -R $SUDO_USER:$SUDO_USER /home/$SUDO_USER/.ssh/;
chmod -R 700 /home/$SUDO_USER/.ssh;
chmod 600 /home/$SUDO_USER/.ssh/authorized_keys;

service ssh restart;
echo "done";