gce: redirect handshake server requests to metadata-concealment too

Author: mikedanese

cluster/gce/gci/configure-helper.sh

@@ -174,7 +174,9 @@ function config-ip-firewall {
   if [[ "${ENABLE_METADATA_CONCEALMENT:-}" == "true" ]] && [[ ! "${METADATA_CONCEALMENT_NO_FIREWALL:-}" == "true" ]]; then
     echo "Add rule for metadata concealment"
     iptables -w -t nat -I PREROUTING -p tcp ! -i eth0 -d "${METADATA_SERVER_IP}" --dport 80 -m comment --comment "metadata-concealment: bridge traffic to metadata server goes to metadata proxy" -j REDIRECT --to-ports 988
+    iptables -w -t nat -I PREROUTING -p tcp ! -i eth0 -d "${METADATA_SERVER_IP}" --dport 8080 -m comment --comment "metadata-concealment: bridge traffic to metadata server goes to metadata proxy" -j REDIRECT --to-ports 987
   fi
+  iptables -w -t raw -I OUTPUT -s 169.254.169.254 -j DROP
 
   # Log all metadata access not from approved processes.
   case "${METADATA_SERVER_FIREWALL_MODE:-off}" in