TLS Termination for TCP

This guide will walk through the steps required to configure TLS Terminate mode for TCP traffic via Envoy Gateway. The guide uses a self-signed CA, so it should be used for testing and demonstration purposes only.

Prerequisites

  • OpenSSL to generate TLS assets.

Installation

Follow the steps from the Quickstart to install Envoy Gateway.

TLS Certificates

Generate the certificates and keys used by the Gateway to terminate client TLS connections.

Create a root certificate and private key to sign certificates:

openssl req -x509 -sha256 -nodes -days 365 -newkey rsa:2048 -subj '/O=example Inc./CN=example.com' -keyout example.com.key -out example.com.crt

Create a certificate and a private key for www.example.com:

openssl req -out www.example.com.csr -newkey rsa:2048 -nodes -keyout www.example.com.key -subj "/CN=www.example.com/O=example organization"
openssl x509 -req -days 365 -CA example.com.crt -CAkey example.com.key -set_serial 0 -in www.example.com.csr -out www.example.com.crt

Store the cert/key in a Secret:

kubectl create secret tls example-cert --key=www.example.com.key --cert=www.example.com.crt

Install the TLS Termination for TCP example resources:

kubectl apply -f https://raw.githubusercontent.com/envoyproxy/gateway/latest/examples/kubernetes/tls-termination.yaml

Verify the Gateway status:

kubectl get gateway/eg -o yaml

Testing

Clusters without External LoadBalancer Support

Get the name of the Envoy service created the by the example Gateway:

export ENVOY_SERVICE=$(kubectl get svc -n envoy-gateway-system --selector=gateway.envoyproxy.io/owning-gateway-namespace=default,gateway.envoyproxy.io/owning-gateway-name=eg -o jsonpath='{.items[0].metadata.name}')

Port forward to the Envoy service:

kubectl -n envoy-gateway-system port-forward service/${ENVOY_SERVICE} 8443:443 &

Query the example app through Envoy proxy:

curl -v -HHost:www.example.com --resolve "www.example.com:8443:127.0.0.1" \
--cacert example.com.crt https://www.example.com:8443/get

Clusters with External LoadBalancer Support

Get the External IP of the Gateway:

export GATEWAY_HOST=$(kubectl get gateway/eg -o jsonpath='{.status.addresses[0].value}')

Query the example app through the Gateway:

curl -v -HHost:www.example.com --resolve "www.example.com:443:${GATEWAY_HOST}" \
--cacert example.com.crt https://www.example.com/get

Last modified May 25, 2024: fix api wording (#3467) (5bc5e0f)