feat(helm): Add a network policy for the controller manager (#2514)

Allows communication in network locked down clusters. This is especially useful to allow the init container of the gatekeeper-update-namespace-label job to communicate with the pods behind the gatekeeper-webhook-service service. Signed-off-by: Kyle Michel <kyle.michel@ontariosystems.com> Signed-off-by: Kyle Michel <kyle.michel@ontariosystems.com> Co-authored-by: Rita Zhang <rita.z.zhang@gmail.com>
open-policy-agent · Jan 13, 2023 · ac8612d · ac8612d
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diff --git a/cmd/build/helmify/static/README.md b/cmd/build/helmify/static/README.md
@@ -171,6 +171,8 @@ _See [Exempting Namespaces](https://open-policy-agent.github.io/gatekeeper/websi
 | controllerManager.securityContext             | Security context applied on the container                                                                                                                                                                                                           | `{ "allowPrivilegeEscalation": false, "capabilities": "drop": [all], "readOnlyRootFilesystem": true, "runAsGroup": 999, "runAsNonRoot": true, "runAsUser": 1000 }` |
 | controllerManager.tlsMinVersion               | Set the minimum supported TLS version for validating and mutating webhook servers                                                                                                                                                                                          | `1.3`                                                                    |
 | controllerManager.extraRules                  | Extra rules for the gatekeeper-manager-role Role                                                                                                                                                                                                    | `[]`                                                                      |
+| controllerManager.networkPolicy.enabled       | Should a network policy for the controller manager be created                                                                                                                                                                                                         | `false`                                                                                                                                                               |
+| controllerManager.networkPolicy.ingress       | Additional ingress rules to be added to the controller manager network policy                                                                                                                                                                                         | `{}`                                                                                                                                                                  |
 | audit.priorityClassName                       | Priority class name for audit controller                                                                                                                                                                                                            | `system-cluster-critical`                                                 |
 | audit.podSecurityContext                      | Security context for audit on pod level                                                                                                                                                                                                          | {fsGroup: 999, suplementalGroups: [999]}                                    |
 | audit.hostNetwork                             | Enables audit to be deployed on hostNetwork                                                                                                                                                                                                         | `false`                                                                   |

diff --git a/cmd/build/helmify/static/templates/gatekeeper-controller-manager-network-policy.yaml b/cmd/build/helmify/static/templates/gatekeeper-controller-manager-network-policy.yaml
@@ -0,0 +1,30 @@
+{{- if .Values.controllerManager.networkPolicy.enabled -}}
+kind: NetworkPolicy
+apiVersion: networking.k8s.io/v1
+metadata:
+  labels:
+    app: '{{ template "gatekeeper.name" . }}'
+    chart: '{{ template "gatekeeper.name" . }}'
+    heritage: '{{ .Release.Service }}'
+    release: '{{ .Release.Name }}'
+  name: gatekeeper-controller-manager
+spec:
+  ingress:
+    - from:
+        - podSelector:
+            matchLabels:
+              app: '{{ template "gatekeeper.name" . }}'
+              release: '{{ .Release.Name }}'
+    {{- with .Values.controllerManager.networkPolicy.ingress }}
+    {{- toYaml . | nindent 4 }}
+    {{- end }}
+  podSelector:
+    matchLabels:
+      app: '{{ template "gatekeeper.name" . }}'
+      chart: '{{ template "gatekeeper.name" . }}'
+      control-plane: controller-manager
+      gatekeeper.sh/operation: webhook
+      gatekeeper.sh/system: "yes"
+      heritage: '{{ .Release.Service }}'
+      release: '{{ .Release.Name }}'
+{{- end -}}
diff --git a/cmd/build/helmify/static/values.yaml b/cmd/build/helmify/static/values.yaml
@@ -183,6 +183,12 @@ controllerManager:
     supplementalGroups:
       - 999
   extraRules: []
+  networkPolicy:
+    enabled: false
+    ingress: { }
+      # - from:
+      #   - ipBlock:
+      #       cidr: 0.0.0.0/0
 audit:
   hostNetwork: false
   dnsPolicy: ClusterFirst

diff --git a/manifest_staging/charts/gatekeeper/README.md b/manifest_staging/charts/gatekeeper/README.md
@@ -171,6 +171,8 @@ _See [Exempting Namespaces](https://open-policy-agent.github.io/gatekeeper/websi
 | controllerManager.securityContext             | Security context applied on the container                                                                                                                                                                                                           | `{ "allowPrivilegeEscalation": false, "capabilities": "drop": [all], "readOnlyRootFilesystem": true, "runAsGroup": 999, "runAsNonRoot": true, "runAsUser": 1000 }` |
 | controllerManager.tlsMinVersion               | Set the minimum supported TLS version for validating and mutating webhook servers                                                                                                                                                                                          | `1.3`                                                                    |
 | controllerManager.extraRules                  | Extra rules for the gatekeeper-manager-role Role                                                                                                                                                                                                    | `[]`                                                                      |
+| controllerManager.networkPolicy.enabled       | Should a network policy for the controller manager be created                                                                                                                                                                                                         | `false`                                                                                                                                                               |
+| controllerManager.networkPolicy.ingress       | Additional ingress rules to be added to the controller manager network policy                                                                                                                                                                                         | `{}`                                                                                                                                                                  |
 | audit.priorityClassName                       | Priority class name for audit controller                                                                                                                                                                                                            | `system-cluster-critical`                                                 |
 | audit.podSecurityContext                      | Security context for audit on pod level                                                                                                                                                                                                          | {fsGroup: 999, suplementalGroups: [999]}                                    |
 | audit.hostNetwork                             | Enables audit to be deployed on hostNetwork                                                                                                                                                                                                         | `false`                                                                   |

diff --git a/...est_staging/charts/gatekeeper/templates/gatekeeper-controller-manager-network-policy.yaml b/...est_staging/charts/gatekeeper/templates/gatekeeper-controller-manager-network-policy.yaml
@@ -0,0 +1,30 @@
+{{- if .Values.controllerManager.networkPolicy.enabled -}}
+kind: NetworkPolicy
+apiVersion: networking.k8s.io/v1
+metadata:
+  labels:
+    app: '{{ template "gatekeeper.name" . }}'
+    chart: '{{ template "gatekeeper.name" . }}'
+    heritage: '{{ .Release.Service }}'
+    release: '{{ .Release.Name }}'
+  name: gatekeeper-controller-manager
+spec:
+  ingress:
+    - from:
+        - podSelector:
+            matchLabels:
+              app: '{{ template "gatekeeper.name" . }}'
+              release: '{{ .Release.Name }}'
+    {{- with .Values.controllerManager.networkPolicy.ingress }}
+    {{- toYaml . | nindent 4 }}
+    {{- end }}
+  podSelector:
+    matchLabels:
+      app: '{{ template "gatekeeper.name" . }}'
+      chart: '{{ template "gatekeeper.name" . }}'
+      control-plane: controller-manager
+      gatekeeper.sh/operation: webhook
+      gatekeeper.sh/system: "yes"
+      heritage: '{{ .Release.Service }}'
+      release: '{{ .Release.Name }}'
+{{- end -}}
diff --git a/manifest_staging/charts/gatekeeper/values.yaml b/manifest_staging/charts/gatekeeper/values.yaml
@@ -183,6 +183,12 @@ controllerManager:
     supplementalGroups:
       - 999
   extraRules: []
+  networkPolicy:
+    enabled: false
+    ingress: { }
+      # - from:
+      #   - ipBlock:
+      #       cidr: 0.0.0.0/0
 audit:
   hostNetwork: false
   dnsPolicy: ClusterFirst