Add IngressMTLS policy support

deployments/common/policy-definition.yaml

@@ -53,6 +53,16 @@ spec:
                   type: array
                   items:
                     type: string
+            ingressMTLS:
+              description: IngressMTLS defines an Ingress MTLS policy.
+              type: object
+              properties:
+                clientCertSecret:
+                  type: string
+                verifyClient:
+                  type: string
+                verifyDepth:
+                  type: integer
             jwt:
               description: JWTAuth holds JWT authentication configuration.
               type: object

deployments/helm-chart/crds/policy.yaml

@@ -55,6 +55,16 @@ spec:
                   type: array
                   items:
                     type: string
+            ingressMTLS:
+              description: IngressMTLS defines an mTLS policy for the ingress side.
+              type: object
+              properties:
+                clientCertSecret:
+                  type: string
+                verifyClient:
+                  type: string
+                verifyDepth:
+                  type: integer
             jwt:
               description: JWTAuth holds JWT authentication configuration.
               type: object

docs-web/configuration/policy-resource.md

@@ -20,6 +20,8 @@ This document is the reference documentation for the Policy resource. An example
       - [RateLimit Merging Behavior](#ratelimit-merging-behavior)
     - [JWT](#jwt)
       - [JWT Merging Behavior](#jwt-merging-behavior)
+    - [IngressMTLS](#ingressmtls)
+      - [IngressMTLS Merging Behavior](#ingressmtls-merging-behavior)
   - [Using Policy](#using-policy)
     - [Validation](#validation)
       - [Structural Validation](#structural-validation)
@@ -63,6 +65,10 @@ spec:
      - The JWT policy configures NGINX Plus to authenticate client requests using JSON Web Tokens.
      - `jwt <#jwt>`_
      - No*
+   * - ``IngressMTLS``
+     - The IngressMTLS policy controls client verification.
+     - `ingressMTLS <#ingressmtls>`_
+     - No*
 ```
 
 \* A policy must include exactly one policy.
@@ -244,6 +250,52 @@ policies:
 ```
 In this example the Ingress Controller will use the configuration from the first policy reference `jwt-policy-one`, and ignores `jwt-policy-two`.
 
+### IngressMTLS
+
+The IngressMTLS policy controls client validation.
+
+For example, the following policy will verify a client using the CA certificate specified in the `ingress-mtls-secret`:
+```yaml
+ingressMTLS:
+  clientCertSecret: ingress-mtls-secret
+  verifyClient: "on"
+  verifyDepth: 1
+```
+
+> Note: The feature is implemented using the NGINX [ngx_http_ssl_module](https://nginx.org/en/docs/http/ngx_http_ssl_module.html).
+
+```eval_rst
+.. list-table::
+   :header-rows: 1
+
+   * - Field
+     - Description
+     - Type
+     - Required
+   * - ``clientCertSecret``
+     - The name of the Kubernetes secret that stores the CA certificate. It must be in the same namespace as the Policy resource. The certificate must be stored in the secret under the key ``ca.crt``, otherwise the secret will be rejected as invalid.
+     - ``string``
+     - Yes
+   * - ``verifyClient``
+     - Verification for the client. Possible values are ``on``, ``off``, ``optional``, ``optional_no_ca``
+     - ``string``
+     - No
+   * - ``verifyDepth``
+     - Sets the verification depth in the client certificates chain.
+     - ``int``
+     - No
+```
+
+#### IngressMTLS Merging Behavior
+
+A VirtualServer/VirtualServerRoute can reference multiple IngressMTLS policies. However, only one can be applied. Every subsequent reference will be ignored. For example, here we reference two policies:
+```yaml
+policies:
+- name: ingress-mtls-policy-one
+- name: ingress-mtls-policy-two
+```
+In this example the Ingress Controller will use the configuration from the first policy reference `ingress-mtls-policy-one`, and ignores `ingress-mtls-policy-two`.
+
 ## Using Policy
 
 You can use the usual `kubectl` commands to work with Policy resources, just as with built-in Kubernetes resources.

examples-of-custom-resources/ingress-mtls/README.md

@@ -0,0 +1,74 @@
+# Ingress MTLS
+
+In this example, we deploy a web application, configure load balancing for it via a VirtualServer, and apply an Ingress MTLS policy.
+
+## Prerequisites
+
+1. Follow the [installation](https://docs.nginx.com/nginx-ingress-controller/installation/installation-with-manifests/) instructions to deploy the Ingress Controller.
+1. Save the public IP address of the Ingress Controller into a shell variable:
+    ```
+    $ IC_IP=XXX.YYY.ZZZ.III
+    ```
+1. Save the HTTP port of the Ingress Controller into a shell variable:
+    ```
+    $ IC_HTTP_PORTS=<port number>
+    ```
+
+## Step 1 - Deploy a Web Application
+
+Create the application deployment and service:
+```
+$ kubectl apply -f webapp.yaml
+```
+
+## Step 2 - Deploy the Ingress MLTS Secret
+
+Create a secret with the name `ingress-mtls-secret` that will be used for Ingress MTLS validation:
+```
+$ kubectl apply -f ingress-mtls-secret.yaml
+```
+
+## Step 3 - Deploy the Ingress MTLS Policy
+
+Create a policy with the name `ingress-mtls-policy` that references the secret from the previous step:
+```
+$ kubectl apply -f ingress-mtls.yaml
+```
+
+## Step 4 - Configure Load Balancing and TLS Termination
+1. Create the secret with the TLS certificate and key:
+    ```
+    $ kubectl create -f tls-secret.yaml
+    ```
+
+2. Create a VirtualServer resource for the web application:
+    ```
+    $ kubectl apply -f virtual-server.yaml
+    ```
+
+Note that the VirtualServer references the policy `ingress-mtls-policy` created in Step 3.
+
+## Step 5 - Test the Configuration
+
+If you attempt to access the application without providing a valid Client certificate and key, NGINX will reject your requests for that VirtualServer:
+```
+$ curl --insecure --resolve webapp.example.com:$IC_HTTPS_PORT:$IC_IP https://webapp.example.com:$IC_HTTPS_PORT/
+<html>
+<head><title>400 No required SSL certificate was sent</title></head>
+<body>
+<center><h1>400 Bad Request</h1></center>
+<center>No required SSL certificate was sent</center>
+<hr><center>nginx/1.19.1</center>
+</body>
+</html>
+```
+
+If you provide a valid Client certificate and key, your request will succeed:
+```
+$ curl --insecure --resolve webapp.example.com:$IC_HTTPS_PORT:$IC_IP https://webapp.example.com:$IC_HTTPS_PORT/ --cert ./client-cert.pem --key ./client-key.pem
+Server address: 10.244.0.8:8080
+Server name: webapp-7c6d448df9-9ts8x
+Date: 23/Sep/2020:07:18:52 +0000
+URI: /
+Request ID: acb0f48057ccdfd250debe5afe58252a
+```

examples-of-custom-resources/ingress-mtls/client-cert.pem

@@ -0,0 +1,20 @@
+-----BEGIN CERTIFICATE-----
+MIIDRDCCAiwCAQEwDQYJKoZIhvcNAQELBQAwgY0xCzAJBgNVBAYTAlVTMQswCQYD
+VQQIDAJDQTEWMBQGA1UEBwwNU2FuIEZyYW5jaXNjbzEOMAwGA1UECgwFTkdJTlgx
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+Sp83Sm5XIgP5KeC9F4H5JWI5vPQIYCPj
+-----END CERTIFICATE-----

examples-of-custom-resources/ingress-mtls/client-key.pem

@@ -0,0 +1,28 @@
+-----BEGIN PRIVATE KEY-----
+MIIEvQIBADANBgkqhkiG9w0BAQEFAASCBKcwggSjAgEAAoIBAQCyRkrSN2Zdl2M6
+eCu1fTuntnzE7wqJLacbLEwx49KuPAJu01ZcGPcT99ZNVkXPJk7Nua0Jcf/v+7+m
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+ico+aGlNtPF+dDwiwrOFQKZm1jn95OqUH/YUco8amMadRy4ELbwSt7DfGTx0vnnh
+cj76gDGOudBs1AG7T8tcJuy91/cgAkDsrEVs/krLroFURlOdGXpkAU59D/HlOKy+
+YqkoadZDAgMBAAECggEBAIqyvYuHppCyM3VOAVOWN09oXvIouB258wTlFfLKuSLt
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+J0s9cvvOrX8Xi6Q9cnB6//HWVJn+h7Mw/c+YUzU338TVhlOdT2KbYKPQTcLo+Ig/
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+xbRf4lOlkyLqig6OV5GRdu4aCl/SeWrA6635uJ8BAoGAWDX26ve1vlX8frKtcdfP
+JZue3RdqfmD1uK6XQ2D+MtQc9M6WTD+vYZZRweFZ0W308fFHnIDli3qwWHUAX2HF
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+n2TgZVY82cjWxA8olS8QcRA=
+-----END PRIVATE KEY-----

examples-of-custom-resources/ingress-mtls/ingress-mtls-secret.yaml

@@ -0,0 +1,7 @@
+kind: Secret
+metadata:
+  name: ingress-mtls-secret
+apiVersion: v1
+type: Opaque
+data:
+  ca.crt: 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

examples-of-custom-resources/ingress-mtls/ingress-mtls.yaml

@@ -0,0 +1,9 @@
+apiVersion: k8s.nginx.org/v1alpha1
+kind: Policy
+metadata:
+  name: ingress-mtls-policy
+spec:
+  ingressMTLS:
+    clientCertSecret: ingress-mtls-secret
+    verifyClient: "on"
+    verifyDepth: 1

examples-of-custom-resources/ingress-mtls/tls-secret.yaml

@@ -0,0 +1,8 @@
+apiVersion: v1
+kind: Secret
+metadata:
+  name: tls-secret
+type: Opaque
+data:
+  tls.crt: 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
+  tls.key: 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

examples-of-custom-resources/ingress-mtls/virtual-server.yaml

@@ -0,0 +1,18 @@
+apiVersion: k8s.nginx.org/v1
+kind: VirtualServer
+metadata:
+  name: webapp
+spec:
+  host: webapp.example.com
+  tls:
+    secret: tls-secret
+  policies:
+  - name: ingress-mtls-policy
+  upstreams:
+  - name: webapp
+    service: webapp-svc
+    port: 80
+  routes:
+  - path: /
+    action:
+      pass: webapp

examples-of-custom-resources/ingress-mtls/webapp.yaml

@@ -0,0 +1,32 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: webapp
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: webapp
+  template:
+    metadata:
+      labels:
+        app: webapp
+    spec:
+      containers:
+      - name: webapp
+        image: nginxdemos/nginx-hello:plain-text
+        ports:
+        - containerPort: 8080
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: webapp-svc
+spec:
+  ports:
+  - port: 80
+    targetPort: 8080
+    protocol: TCP
+    name: http
+  selector:
+    app: webapp