Make it possible to enable the shield addon for LBC

docs/addons.md

@@ -45,7 +45,16 @@ a given ALB at a time, despite it accepting both the
 "alb.ingress.kubernetes.io/wafv2-acl-arn" annotations on the same
 _Ingress_ object.
 
-Support for this WAF service in kOps is currently **beta**, meaning
+You can enable use of Shield Advanced by including the following fields in the cluster spec:
+
+```yaml
+spec:
+  awsLoadBalancerController:
+    enabled: true
+    enableShield: true
+```
+
+Support for the WAF and Shield services in kOps is currently **beta**, meaning
 that the accepted configuration and the AWS resources involved may
 change.
 

k8s/crds/kops.k8s.io_clusters.yaml

@@ -262,6 +262,10 @@ spec:
                 description: AWSLoadbalancerControllerConfig determines the AWS LB
                   controller configuration.
                 properties:
+                  enableShield:
+                    description: 'EnableShield specifies whether the controller can
+                      enable Shield Advanced. Default: false'
+                    type: boolean
                   enableWAF:
                     description: 'EnableWAF specifies whether the controller can use
                       WAFs (Classic Regional). Default: false'

pkg/apis/kops/componentconfig.go

@@ -1069,6 +1069,9 @@ type AWSLoadBalancerControllerConfig struct {
 	// EnableWAFv2 specifies whether the controller can use WAFs (V2).
 	// Default: false
 	EnableWAFv2 bool `json:"enableWAFv2,omitempty"`
+	// EnableShield specifies whether the controller can enable Shield Advanced.
+	// Default: false
+	EnableShield bool `json:"enableShield,omitempty"`
 }
 
 // HasAdmissionController checks if a specific admission controller is enabled

pkg/apis/kops/v1alpha2/componentconfig.go

@@ -1095,6 +1095,9 @@ type AWSLoadBalancerControllerConfig struct {
 	// EnableWAFv2 specifies whether the controller can use WAFs (V2).
 	// Default: false
 	EnableWAFv2 bool `json:"enableWAFv2,omitempty"`
+	// EnableShield specifies whether the controller can enable Shield Advanced.
+	// Default: false
+	EnableShield bool `json:"enableShield,omitempty"`
 }
 
 // HasAdmissionController checks if a specific admission controller is enabled

pkg/apis/kops/v1alpha2/zz_generated.conversion.go

@@ -1336,6 +1336,7 @@ func autoConvert_v1alpha2_AWSLoadBalancerControllerConfig_To_kops_AWSLoadBalance
 	out.Version = in.Version
 	out.EnableWAF = in.EnableWAF
 	out.EnableWAFv2 = in.EnableWAFv2
+	out.EnableShield = in.EnableShield
 	return nil
 }
 
@@ -1349,6 +1350,7 @@ func autoConvert_kops_AWSLoadBalancerControllerConfig_To_v1alpha2_AWSLoadBalance
 	out.Version = in.Version
 	out.EnableWAF = in.EnableWAF
 	out.EnableWAFv2 = in.EnableWAFv2
+	out.EnableShield = in.EnableShield
 	return nil
 }
 

pkg/apis/kops/v1alpha3/componentconfig.go

@@ -1066,4 +1066,7 @@ type AWSLoadBalancerControllerConfig struct {
 	// EnableWAFv2 specifies whether the controller can use WAFs (V2).
 	// Default: false
 	EnableWAFv2 bool `json:"enableWAFv2,omitempty"`
+	// EnableShield specifies whether the controller can enable Shield Advanced.
+	// Default: false
+	EnableShield bool `json:"enableShield,omitempty"`
 }

pkg/apis/kops/v1alpha3/zz_generated.conversion.go

@@ -1336,6 +1336,7 @@ func autoConvert_v1alpha3_AWSLoadBalancerControllerConfig_To_kops_AWSLoadBalance
 	out.Version = in.Version
 	out.EnableWAF = in.EnableWAF
 	out.EnableWAFv2 = in.EnableWAFv2
+	out.EnableShield = in.EnableShield
 	return nil
 }
 
@@ -1349,6 +1350,7 @@ func autoConvert_kops_AWSLoadBalancerControllerConfig_To_v1alpha3_AWSLoadBalance
 	out.Version = in.Version
 	out.EnableWAF = in.EnableWAF
 	out.EnableWAFv2 = in.EnableWAFv2
+	out.EnableShield = in.EnableShield
 	return nil
 }
 

pkg/model/components/addonmanifests/awsloadbalancercontroller/iam.go

@@ -34,11 +34,13 @@ func (r *ServiceAccount) BuildAWSPolicy(b *iam.PolicyBuilder) (*iam.Policy, erro
 
 	var enableWAF bool
 	var enableWAFv2 bool
+	var enableShield bool
 	if c := b.Cluster.Spec.AWSLoadBalancerController; c != nil {
 		enableWAF = c.EnableWAF
 		enableWAFv2 = c.EnableWAFv2
+		enableShield = c.EnableShield
 	}
-	iam.AddAWSLoadbalancerControllerPermissions(p, enableWAF, enableWAFv2)
+	iam.AddAWSLoadbalancerControllerPermissions(p, enableWAF, enableWAFv2, enableShield)
 
 	return p, nil
 }

pkg/model/iam/iam_builder.go

@@ -425,7 +425,7 @@ func (r *NodeRoleMaster) BuildAWSPolicy(b *PolicyBuilder) (*Policy, error) {
 		}
 
 		if c := b.Cluster.Spec.AWSLoadBalancerController; c != nil && fi.BoolValue(b.Cluster.Spec.AWSLoadBalancerController.Enabled) {
-			AddAWSLoadbalancerControllerPermissions(p, c.EnableWAF, c.EnableWAFv2)
+			AddAWSLoadbalancerControllerPermissions(p, c.EnableWAF, c.EnableWAFv2, c.EnableShield)
 		}
 
 		var useStaticInstanceList bool
@@ -956,7 +956,7 @@ func AddCCMPermissions(p *Policy, cloudRoutes bool) {
 }
 
 // AddAWSLoadbalancerControllerPermissions adds the permissions needed for the AWS Load Balancer Controller to the givnen policy
-func AddAWSLoadbalancerControllerPermissions(p *Policy, enableWAF bool, enableWAFv2 bool) {
+func AddAWSLoadbalancerControllerPermissions(p *Policy, enableWAF, enableWAFv2, enableShield bool) {
 	p.unconditionalAction.Insert(
 		"acm:DescribeCertificate",
 		"acm:ListCertificates",
@@ -998,6 +998,16 @@ func AddAWSLoadbalancerControllerPermissions(p *Policy, enableWAF bool, enableWA
 			"wafv2:GetWebACLForResource",
 		)
 	}
+
+	if enableShield {
+		p.unconditionalAction.Insert(
+			"shield:GetSubscriptionState",
+			"shield:DescribeProtection",
+			"shield:CreateProtection",
+			"shield:DeleteProtection",
+		)
+	}
+
 	p.clusterTaggedAction.Insert(
 		"ec2:AuthorizeSecurityGroupIngress", // aws.go
 		"ec2:DeleteSecurityGroup",           // aws.go

upup/models/cloudup/resources/addons/aws-load-balancer-controller.addons.k8s.io/k8s-1.19.yaml.template

@@ -744,7 +744,7 @@ spec:
         - --cluster-name={{ ClusterName }}
         - --enable-waf={{ .AWSLoadBalancerController.EnableWAF }}
         - --enable-wafv2={{ .AWSLoadBalancerController.EnableWAFv2 }}
-        - --enable-shield=false
+        - --enable-shield={{ .AWSLoadBalancerController.EnableShield }}
         - --ingress-class=alb
         - "--default-tags={{ CloudLabels }}"
         - --aws-region={{ Region }}