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<a title="Describes how requests are routed between services in an Istio service mesh." href="/v0.8/docs/concepts/traffic-management/request-routing/">Request Routing</a>
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<a title="Describes how to configure Istio to expose a service outside of the service mesh." href="/v0.8/docs/tasks/traffic-management/ingress/">Control Ingress Traffic</a>
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<a title="Describes how to configure Istio to expose a service outside of the service mesh, over TLS or Mutual TLS." href="/v0.8/docs/tasks/traffic-management/secure-ingress/">Securing Gateways with HTTPS</a>
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<a title="Describes how to configure Istio to route traffic from services in the mesh to external services." href="/v0.8/docs/tasks/traffic-management/egress/">Control Egress Traffic</a>
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<a title="Describes how to configure Istio to perform TLS origination for traffic to external services" href="/v0.8/docs/tasks/traffic-management/egress-tls-origination/">TLS Origination for Egress Traffic</a>
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<a title="Describes how to configure Istio to direct traffic to external services through a dedicated gateway service" href="/v0.8/docs/tasks/traffic-management/egress-gateway/">Configure an Egress Gateway</a>
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<a title="This task demonstrates the circuit-breaking capability for resilient applications" href="/v0.8/docs/tasks/traffic-management/circuit-breaking/">Circuit Breaking</a>
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<a title="This task demonstrates the traffic shadowing/mirroring capabilities of Istio" href="/v0.8/docs/tasks/traffic-management/mirroring/">Mirroring</a>
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<a title="Demonstrates how to secure the mesh." href="/v0.8/docs/tasks/security/">Security </a>
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<a title="Shows you how to use Istio authentication policy to setup mutual TLS and basic end-user authentication." href="/v0.8/docs/tasks/security/authn-policy/">Basic Authentication Policy</a>
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<span class="current" title="Shows you how to verify and test Istio&#39;s automatic mutual TLS authentication.">Testing Mutual TLS</span>
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<a title="Shows how to control access to a service using the Kubernetes labels." href="/v0.8/docs/tasks/security/basic-access-control/">Basic Access Control</a>
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<a title="Shows how to securely control access to a service using service accounts." href="/v0.8/docs/tasks/security/secure-access-control/">Secure Access Control</a>
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<a title="Shows how to set up role-based access control for services in Istio mesh." href="/v0.8/docs/tasks/security/role-based-access-control/">Role-Based Access Control</a>
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<a title="Shows how operators can configure Citadel with existing root certificate, signing certificate and key." href="/v0.8/docs/tasks/security/plugin-ca-cert/">Plugging in external CA key and certificate</a>
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<a title="Shows how to enable Citadel health checking with Kubernetes." href="/v0.8/docs/tasks/security/health-check/">Citadel health checking</a>
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<a title="Shows how to enable mutual TLS on HTTPS services." href="/v0.8/docs/tasks/security/https-overlay/">Mutual TLS over HTTPS</a>
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<a title="Demonstrates policy enforcement features." href="/v0.8/docs/tasks/policy-enforcement/">Policies </a>
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<a title="This task shows you how to use Istio to dynamically limit the traffic to a service." href="/v0.8/docs/tasks/policy-enforcement/rate-limiting/">Enabling Rate Limits</a>
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<a title="Demonstrates how to collect telemetry information from the mesh." href="/v0.8/docs/tasks/telemetry/">Telemetry </a>
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<a title="How to configure the proxies to send tracing requests to Zipkin or Jaeger" href="/v0.8/docs/tasks/telemetry/distributed-tracing/">Distributed Tracing</a>
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<a title="This task shows you how to configure Istio to collect metrics and logs." href="/v0.8/docs/tasks/telemetry/metrics-logs/">Collecting Metrics and Logs</a>
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<a title="This task shows you how to configure Istio to collect metrics for TCP services." href="/v0.8/docs/tasks/telemetry/tcp-metrics/">Collecting Metrics for TCP services</a>
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<a title="This task shows you how to query for Istio Metrics using Prometheus." href="/v0.8/docs/tasks/telemetry/querying-metrics/">Querying Metrics from Prometheus</a>
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<a title="This task shows you how to setup and use the Istio Dashboard to monitor mesh traffic." href="/v0.8/docs/tasks/telemetry/using-istio-dashboard/">Visualizing Metrics with Grafana</a>
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<a title="This task shows you how to generate a graph of services within an Istio mesh." href="/v0.8/docs/tasks/telemetry/servicegraph/">Generating a Service Graph</a>
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<a title="This task shows you how to configure Istio to log to a Fluentd daemon" href="/v0.8/docs/tasks/telemetry/fluentd/">Logging with Fluentd</a>
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<a title="This guide deploys a sample application composed of four separate microservices which will be used to demonstrate various features of the Istio service mesh." href="/v0.8/docs/guides/bookinfo/">Bookinfo Sample Application</a>
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<a title="This guide demonstrates how to use various traffic management capabilities of an Istio service mesh." href="/v0.8/docs/guides/intelligent-routing/">Intelligent Routing</a>
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<a title="This sample demonstrates how to obtain uniform metrics, logs, traces across different services using Istio Mixer and Istio sidecar." href="/v0.8/docs/guides/telemetry/">In-Depth Telemetry</a>
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<a title="Explains how to manually integrate Google Cloud Endpoints services with Istio." href="/v0.8/docs/guides/endpoints/">Install Istio for Google Cloud Endpoints Services</a>
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<a title="This sample deploys the Bookinfo services across Kubernetes and a set of virtual machines, and illustrates how to use the Istio service mesh to control this infrastructure as a single mesh." href="/v0.8/docs/guides/integrating-vms/">Integrating Virtual Machines</a>
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Performance and Scalability
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<a title="Provides a conceptual introduction to Istio&#39;s Performance and Scalability" href="/v0.8/docs/performance-and-scalability/overview/">Overview</a>
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<a title="Performance measurement through code level micro-benchmarks." href="/v0.8/docs/performance-and-scalability/microbenchmarks/">Micro Benchmarks</a>
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<a title="The different scenarios we are tracking for performance and scalability." href="/v0.8/docs/performance-and-scalability/scenarios/">Testing scenarios</a>
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<a title="Fortio is our simple synthetic http and grpc benchmarking tool." href="/v0.8/docs/performance-and-scalability/synthetic-benchmarks/">Synthetic End to End benchmarks</a>
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<a title="Performance measurement through realistic micro service application tests." href="/v0.8/docs/performance-and-scalability/realistic-app-benchmark/">Realistic Application Benchmark</a>
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<a title="Setup of Istio components to scale horizontally. High availability. Sizing guide." href="/v0.8/docs/performance-and-scalability/scalability/">Scalability and Sizing Guide</a>
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<a title="Describes the base attribute vocabulary used for policy and control." href="/v0.8/docs/reference/config/policy-and-telemetry/attribute-vocabulary/">Attribute Vocabulary</a>
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<a title="Mixer config expression language reference." href="/v0.8/docs/reference/config/policy-and-telemetry/expression-language/">Expression Language</a>
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<a title="Adapter for cloudwatch metrics." href="/v0.8/docs/reference/config/policy-and-telemetry/adapters/cloudwatch/">CloudWatch</a>
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<a title="Adapter to deliver metrics to a dogstatsd agent for delivery to DataDog" href="/v0.8/docs/reference/config/policy-and-telemetry/adapters/datadog/">Datadog</a>
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<a title="Adapter that always returns a precondition denial." href="/v0.8/docs/reference/config/policy-and-telemetry/adapters/denier/">Denier</a>
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<a title="Adapter that delivers logs to a fluentd daemon." href="/v0.8/docs/reference/config/policy-and-telemetry/adapters/fluentd/">Fluentd</a>
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<a title="Adapter that extracts information from a Kubernetes environment." href="/v0.8/docs/reference/config/policy-and-telemetry/adapters/kubernetesenv/">Kubernetes Env</a>
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<a title="Adapter that performs whitelist or blacklist checks" href="/v0.8/docs/reference/config/policy-and-telemetry/adapters/list/">List</a>
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<a title="Adapter for a simple in-memory quota management system." href="/v0.8/docs/reference/config/policy-and-telemetry/adapters/memquota/">Memory quota</a>
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<a title="Adapter that implements an Open Policy Agent engine" href="/v0.8/docs/reference/config/policy-and-telemetry/adapters/opa/">OPA</a>
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<a title="Adapter for a Redis-based quota management system." href="/v0.8/docs/reference/config/policy-and-telemetry/adapters/redisquota/">Redis Quota</a>
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<a title="Adapter that delivers logs and metrics to Google Service Control" href="/v0.8/docs/reference/config/policy-and-telemetry/adapters/servicecontrol/">Service Control</a>
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<a title="Adapter to deliver logs and metrics to Papertrail and AppOptics backends" href="/v0.8/docs/reference/config/policy-and-telemetry/adapters/solarwinds/">SolarWinds</a>
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<a title="Adapter to deliver logs and metrics to Stackdriver" href="/v0.8/docs/reference/config/policy-and-telemetry/adapters/stackdriver/">Stackdriver</a>
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<a title="Adapter to deliver metrics to a StatsD backend" href="/v0.8/docs/reference/config/policy-and-telemetry/adapters/statsd/">StatsD</a>
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<a title="Adapter for outputting logs and metrics locally." href="/v0.8/docs/reference/config/policy-and-telemetry/adapters/stdio/">Stdio</a>
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<a title="A template that represents a single runtime log entry." href="/v0.8/docs/reference/config/policy-and-telemetry/templates/logentry/">Log Entry</a>
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<a title="A template that represents a single runtime metric." href="/v0.8/docs/reference/config/policy-and-telemetry/templates/metric/">Metric</a>
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<a title="A template that represents a quota allocation request" href="/v0.8/docs/reference/config/policy-and-telemetry/templates/quota/">Quota</a>
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<a title="A template that carries no data, useful for testing." href="/v0.8/docs/reference/config/policy-and-telemetry/templates/reportnothing/">Report Nothing</a>
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<a title="A template used by the Google Service Control adapter." href="/v0.8/docs/reference/config/policy-and-telemetry/templates/servicecontrolreport/">Service Control Report</a>
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<a title="Describes the rules used to configure Mixer&#39;s policy and telemetry features." href="/v0.8/docs/reference/config/policy-and-telemetry/istio.policy.v1beta1/">Rules</a>
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<a title="Configuration for Role Based Access Control" href="/v0.8/docs/reference/config/istio.rbac.v1alpha1/">RBAC</a>
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<a title="Configuration affecting traffic routing" href="/v0.8/docs/reference/config/istio.routing.v1alpha1/">Route Rules v1alpha1 (deprecated)</a>
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<a title="Configuration affecting traffic routing" href="/v0.8/docs/reference/config/istio.networking.v1alpha3/">Route Rules v1alpha3</a>
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<h1 id="title">Testing Mutual TLS</h1>
<nav class="toc-inlined d-xl-none d-print-none" >
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<nav id="InlinedTableOfContents">
<ul>
<li><a href="#before-you-begin">Before you begin</a></li>
<li><a href="#verifying-istios-mutual-tls-authentication-setup">Verifying Istio's mutual TLS authentication setup</a>
<ul>
<li><a href="#verifying-citadel">Verifying Citadel</a></li>
<li><a href="#verifying-service-configuration">Verifying service configuration</a></li>
<li><a href="#verifying-keys-and-certificates-installation">Verifying keys and certificates installation</a></li>
</ul>
</li>
<li><a href="#testing-the-authentication-setup">Testing the authentication setup</a></li>
<li><a href="#cleanup">Cleanup</a></li>
<li><a href="#whats-next">What's next</a></li>
</ul>
</nav>
</div>
</nav>
<p>Through this task, you will learn how to:</p>
<ul>
<li>
<p>Verify the Istio mutual TLS Authentication setup</p>
</li>
<li>
<p>Manually test the authentication</p>
</li>
</ul>
<h2 id="before-you-begin">Before you begin</h2>
<p>This task assumes you have a Kubernetes cluster:</p>
<ul>
<li>
<p>Installed Istio with global mutual TLS enabled:</p>
<pre><code class="language-command" data-lang="command">$ kubectl apply -f @install/kubernetes/istio-demo-auth.yaml@
</code></pre><p><em><strong>OR</strong></em>
Using <a href="/v0.8/docs/setup/kubernetes/helm-install/">Helm</a> with <code>global.mtls.enabled</code> to <code>true</code>.</p>
</li>
</ul>
<blockquote>
<p>Starting with Istio 0.7, you can use <a href="/v0.8/docs/concepts/security/authn-policy/">authentication policy</a> to configure mutual TLS for all/selected services in a namespace (repeated for all namespaces to get global setting). See <a href="/v0.8/docs/tasks/security/authn-policy/">authentication policy task</a></p>
</blockquote>
<ul>
<li>
<p>For demo, deploy <a href="https://github.com/istio/istio/blob/release-0.8/samples/httpbin">httpbin</a> and <a href="https://github.com/istio/istio/tree/master/samples/sleep">sleep</a> with Envoy sidecar. For simplicity, the demo is setup in the <code>default</code> namespace. If you wish to use a different namespace, please add <code>-n yournamespace</code> appropriately to the example commands in the next section.</p>
<pre><code class="language-command" data-lang="command">$ kubectl apply -f &lt;(istioctl kube-inject -f @samples/httpbin/httpbin.yaml@)
$ kubectl apply -f &lt;(istioctl kube-inject -f @samples/sleep/sleep.yaml@)
</code></pre></li>
</ul>
<h2 id="verifying-istios-mutual-tls-authentication-setup">Verifying Istio's mutual TLS authentication setup</h2>
<h3 id="verifying-citadel">Verifying Citadel</h3>
<p>Verify the cluster-level Citadel is running:</p>
<pre><code class="language-command" data-lang="command">$ kubectl get deploy -l istio=citadel -n istio-system
NAME DESIRED CURRENT UP-TO-DATE AVAILABLE AGE
istio-citadel 1 1 1 1 1m
</code></pre><p>Citadel is up if the &ldquo;AVAILABLE&rdquo; column is 1.</p>
<h3 id="verifying-service-configuration">Verifying service configuration</h3>
<ul>
<li>
<p>Check installation mode. If mutual TLS is enabled by default (e.g <code>istio-demo-auth.yaml</code> was used when installing Istio), you can expect to see uncommented <code>authPolicy: MUTUAL_TLS</code> in the configmap.</p>
<pre><code class="language-command" data-lang="command">$ kubectl get configmap istio -o yaml -n istio-system | grep authPolicy | head -1
</code></pre></li>
<li>
<p>Check authentication policies. Mutual TLS can also be enabled (or disabled) per service(s) by authentication policy. A policy, if exist, will overwrite the configmap setting for the targeted services. Unfortunately, there is no quick way to get relevant policies for a service, other than examining all policies in the applicable namespace:</p>
<pre><code class="language-command" data-lang="command">$ kubectl get policies.authentication.istio.io -n default -o yaml
</code></pre></li>
<li>
<p>Check destination rule. Starting with Istio 0.8, destination rule's <a href="/v0.8/docs/reference/config/istio.networking.v1alpha3/#TrafficPolicy">traffic policy</a> is used to configure client side to use (or not use) mutual TLS. For backward compatibility, the <em>default</em> traffic policy is inferred from configmap flag (i.e, if <code>authPolicy: MUTUAL_TLS</code>, <em>default</em> traffic policy also be <code>MUTUAL_TLS</code>). If there is authentication policy overrules this setting for some services, it should accompany with the appropriate destination rule(s). Similar to authentication policy, the only way to verify the settings is to manually check all rules:</p>
<pre><code class="language-command" data-lang="command">$ kubectl get destinationrules.networking.istio.io --all-namespaces -o yaml
</code></pre><blockquote>
<p>Note that the destination rules scoping model is not limited to namespaces. Thus, it's necessary to examine rules in all namespaces.</p>
</blockquote>
</li>
</ul>
<h3 id="verifying-keys-and-certificates-installation">Verifying keys and certificates installation</h3>
<p>Istio automatically installs necessary keys and certificates for mutual TLS authentication in all sidecar containers.</p>
<pre><code class="language-command" data-lang="command">$ kubectl exec $(kubectl get pod -l app=httpbin -o jsonpath={.items..metadata.name}) -c istio-proxy -- ls /etc/certs
cert-chain.pem
key.pem
root-cert.pem
</code></pre><blockquote>
<p><code>cert-chain.pem</code> is Envoy's cert that needs to be presented to the other side. <code>key.pem</code> is Envoy's private key
paired with Envoy's cert in <code>cert-chain.pem</code>. <code>root-cert.pem</code> is the root cert to verify the peer's cert.
In this example, we only have one Citadel in a cluster, so all Envoys have the same <code>root-cert.pem</code>.</p>
</blockquote>
<p>Use the <code>oppenssl</code> tool to check if certificate is valid (current time should be in between <code>Not Before</code> and <code>Not After</code>)</p>
<pre><code class="language-command" data-lang="command">$ kubectl exec $(kubectl get pod -l app=httpbin -o jsonpath={.items..metadata.name}) -c istio-proxy -- cat /etc/certs/cert-chain.pem | openssl x509 -text -noout | grep Validity -A 2
Validity
Not Before: May 17 23:02:11 2018 GMT
Not After : Aug 15 23:02:11 2018 GMT
</code></pre><p>You can also check the <em>identity</em> of the client certificate:</p>
<pre><code class="language-command" data-lang="command">$ kubectl exec $(kubectl get pod -l app=httpbin -o jsonpath={.items..metadata.name}) -c istio-proxy -- cat /etc/certs/cert-chain.pem | openssl x509 -text -noout | grep 'Subject Alternative Name' -A 1
X509v3 Subject Alternative Name:
URI:spiffe://cluster.local/ns/default/sa/default
</code></pre><p>Please check <a href="/v0.8/docs/concepts/security/mutual-tls/#workflow">secure naming</a> for more information about <em>service identity</em> in Istio.</p>
<h2 id="testing-the-authentication-setup">Testing the authentication setup</h2>
<p>Assuming mutual TLS authentication is properly turned on, it should not affect communication from one service to another when both sides have the Envoy sidecar. However, requests from pod without sidecar, or requests directly from sidecar without a client certificate should fail. Examples below illustrates this behavior.</p>
<ol>
<li>
<p>Request from <code>sleep</code> app container to <code>httpbin</code> service should succeed (return <code>200</code>)</p>
<pre><code class="language-command" data-lang="command">$ kubectl exec $(kubectl get pod -l app=sleep -o jsonpath={.items..metadata.name}) -c sleep -- curl httpbin:8000/headers -o /dev/null -s -w '%{http_code}\n'
200
</code></pre></li>
<li>
<p>Request from <code>sleep</code> <em>proxy</em> container to <code>httpbin</code> service on the other hand fails, as request does not use TLS nor provide a client certificate</p>
<pre><code class="language-command" data-lang="command">$ kubectl exec $(kubectl get pod -l app=sleep -o jsonpath={.items..metadata.name}) -c istio-proxy -- curl httpbin:8000/headers -o /dev/null -s -w '%{http_code}\n'
000
command terminated with exit code 56
</code></pre><pre><code class="language-command" data-lang="command">$ kubectl exec $(kubectl get pod -l app=sleep -o jsonpath={.items..metadata.name}) -c istio-proxy -- curl https://httpbin:8000/headers -o /dev/null -s -w '%{http_code}\n'
000
command terminated with exit code 77
</code></pre></li>
<li>
<p>However, request will success if client certificate is provided</p>
<pre><code class="language-command" data-lang="command">$ kubectl exec $(kubectl get pod -l app=sleep -o jsonpath={.items..metadata.name}) -c istio-proxy -- curl https://httpbin:8000/headers -o /dev/null -s -w '%{http_code}\n' --key /etc/certs/key.pem --cert /etc/certs/cert-chain.pem --cacert /etc/certs/root-cert.pem -k
200
</code></pre><blockquote>
<p>Istio uses <a href="https://kubernetes.io/docs/tasks/configure-pod-container/configure-service-account/">Kubernetes service accounts</a> as service identity, which offers stronger security than service name (refer <a href="/v0.8/docs/concepts/security/mutual-tls/#identity">here</a> for more information). Thus the certificates used in Istio do not have service names, which is the information that <code>curl</code> needs to verify server identity. As a result, we use <code>curl</code> option <code>-k</code> to prevent the <code>curl</code> client from aborting when failing to find and verify the server name (i.e., httpbin.ns.svc.cluster.local) in the certificate provided by the server.</p>
</blockquote>
</li>
<li>
<p>Request from pod without sidecar. For this demo, let's install another <code>sleep</code> service without sidecar. To avoid name conflicts, we put it in different namespace.</p>
<pre><code class="language-command" data-lang="command">$ kubectl create ns legacy
$ kubectl apply -f @samples/sleep/sleep.yaml@ -n legacy
</code></pre></li>
<li>
<p>Wait after the pod status changes to <code>Running</code>, issue the familiar <code>curl</code> command. The request should fail as the pod doesn't have a sidecar to help initiate TLS communication.</p>
<pre><code class="language-command" data-lang="command">kubectl exec $(kubectl get pod -l app=sleep -o jsonpath={.items..metadata.name} -n legacy) -c sleep -n legacy -- curl httpbin.default:8000/headers -o /dev/null -s -w '%{http_code}\n'
000
command terminated with exit code 56
</code></pre></li>
</ol>
<h2 id="cleanup">Cleanup</h2>
<pre><code class="language-command" data-lang="command">$ kubectl delete --ignore-not-found=true -f @samples/httpbin/httpbin.yaml@
$ kubectl delete --ignore-not-found=true -f @samples/sleep/sleep.yaml@
$ kubectl delete --ignore-not-found=true ns legacy
</code></pre><h2 id="whats-next">What's next</h2>
<ul>
<li>Learn more about the design principles behind Istio's automatic mutual TLS authentication
between all services in this <a href="/v0.8/blog/2017/0.1-auth/">blog</a>.</li>
</ul>
</main>
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<a title="Shows you how to use Istio authentication policy to setup mutual TLS and basic end-user authentication." href="/v0.8/docs/tasks/security/authn-policy/"><i class="fa fa-arrow-left"></i> Basic Authentication Policy</a>
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<a title="Shows how to control access to a service using the Kubernetes labels." href="/v0.8/docs/tasks/security/basic-access-control/">Basic Access Control <i class="fa fa-arrow-right"></i></a>
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<ul>
<li><a href="#verifying-citadel">Verifying Citadel</a></li>
<li><a href="#verifying-service-configuration">Verifying service configuration</a></li>
<li><a href="#verifying-keys-and-certificates-installation">Verifying keys and certificates installation</a></li>
</ul>
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