Disable password logins for mesh nodes

If you need to get ssh access then manually add a public key to authorized_keys

src/freedombone-image-mesh

 INSTALL_DIR=/root/build
 INSTALL_LOG=/var/log/${PROJECT_NAME}.log
 
+DEFAULT_USERNAME=fbone
+
 TOX_NODES=
 #TOX_NODES=(
 #  '192.254.75.102,2607:5600:284::2,33445,951C88B7E75C867418ACDB5D273821372BB5BD652740BCDF623A4FA293E75D2F,Tox RELENG,US'
 	echo $'toxic client configured' >> $INSTALL_LOG
 }
 
+function disable_password_logins {
+	if [ ! -d /home/$DEFAULT_USERNAME ]; then
+		echo $"Home directory for $DEFAULT_USERNAME not found"
+		exit 3682572
+	fi
+
+	# create an authorized_keys file
+	if [ ! -d /home/$DEFAULT_USERNAME/.ssh ]; then
+		mkdir -p /home/$DEFAULT_USERNAME/.ssh
+	fi
+	if [ ! -f /home/$DEFAULT_USERNAME/.ssh/authorized_keys ]; then
+		touch /home/$DEFAULT_USERNAME/.ssh/authorized_keys
+	fi
+	chown -R $DEFAULT_USERNAME:$DEFAULT_USERNAME /home/$DEFAULT_USERNAME/.ssh
+
+	# disable password logins
+	sed -i 's|#PasswordAuthentication.*|PasswordAuthentication no|g' /etc/ssh/sshd_config
+	sed -i 's|PasswordAuthentication.*|PasswordAuthentication no|g' /etc/ssh/sshd_config
+}
+
 if [ -f /root/.initial_mesh_setup ]; then
 	if [ $1 ]; then
 		MY_USERNAME=$1
 	#compile_tox_client
 	configure_toxcore
 	configure_zeronet
+	disable_password_logins
 
 	rm /root/.initial_mesh_setup
 	systemctl disable mesh-setup.service