aws-vpce-operator

aws-vpce-operator (AVO)

AVO is an OpenShift operator that manages connectivity to private VPC Endpoint Services via VPC Endpoints and aims to make private network connectivity easy and painless.

Usage

In a practical sense, given a service that is exposed via an AWS VPC Endpoint Service (i.e. not exposed over the public internet), the VpcEndpoint CRD defines an API to configure three components in a customer cluster to create network connectivity between components in a customer cluster and the private VPC Endpoint Service, illustrated below.

graph LR
  B[VPCE] --> C
  subgraph Splunk Hosting Account
  C[Splunk VPCE Service]
  end
  subgraph Customer Account
  subgraph ROSA Cluster
  A[ExternalName Service]
  end
  A --Cluster's Private Hosted Zone--> B
  end

If auto-acceptance is disabled on the VPC Endpoint Service, then the VPC Endpoint will be in a pendingAcceptance state until the connection is accepted inside the service hosting account. Work is being done to provide an automated solution for this acceptance!

Requirements

AVO currently assumes it is running on an AWS OpenShift cluster, specifically:

• The existence of a infrastructures.config.openshift.io CR named default
• The existence of a dnses.config.openshift.io CR named default
• Minimum K8s RBAC defined here
• Minimum AWS IAM Policy:

    {
      "Version": "2012-10-17",
      "Statement": [
        {
          "Effect": "Allow",
          "Action": [
            "ec2:CreateTags",
            "ec2:DescribeSubnets",
            "ec2:CreateSecurityGroup",
            "ec2:DeleteSecurityGroup",
            "ec2:DescribeSecurityGroups",
            "ec2:AuthorizeSecurityGroupIngress",
            "ec2:AuthorizeSecurityGroupEgress",
            "ec2:DescribeSecurityGroupRules",
            "ec2:CreateVpcEndpoint",
            "ec2:DeleteVpcEndpoints",
            "ec2:DescribeVpcEndpoints",
            "ec2:DescribeVpcs",
            "ec2:ModifyVpcEndpoint",
            "ec2:DescribeVpcEndpointServices",
            "route53:ChangeResourceRecordSets",
            "route53:ListHostedZonesByVPC",
            "route53:ListResourceRecordSets",
            "route53:ListTagsForResource",
            "route53:GetHostedZone",
            "route53:CreateHostedZone",
            "route53:DeleteHostedZone",
            "route53:ChangeTagsForResource",
            "route53:CreateVpcAssociationAuthorization"
          ],
          "Resource": "*"
        }
      ]
    }

Custom Resource Definitions (CRDs)

VpcEndpoint

---
apiVersion: avo.openshift.io/v1alpha2
kind: VpcEndpoint
metadata:
  name: demo
  namespace: openshift-aws-vpce-operator
spec:
  serviceName: "com.amazonaws.vpce.us-east-2.vpce-svc-00000000000000000"
  securityGroup:
    ingressRules:
      - fromPort: 6443
        toPort: 6443
        protocol: tcp
  customDns:
    route53PrivateHostedZone:
      autoDiscoverPrivateHostedZone: false
      id: "Z10360602M0THU1Q366IN"
      record:
        hostname: "test"
        externalNameService:
          name: "test"
  vpc:
    autoDiscoverSubnets: false
    subnetIds:
      - "subnet-0f64d2ce8aea72990"

• .spec.serviceName is the name of the VPC Endpoint Service to connect to
• .metadata.name becomes the name of the VPC Endpoint
• .spec.securityGroup defines security group ingress and egress rules that will be attached to the created VPC Endpoint
• .spec.customDns defines additional custom DNS configurations that can be added to the VPC Endpoint, such as an Route 53 Private Hosted Zone and Record with an ExternalName Kubernetes Service

VpcEndpointAcceptance

---
apiVersion: avo.openshift.io/v1alpha1
kind: VpcEndpointAcceptance
metadata:
  name: example-acceptance
  namespace: example-namespace
spec:
  id: "vpce-svc-123456789"
  assumeRoleArn: "arn:aws-us-gov:iam::123456789:role/exampleIAMrole"
  region: "us-gov-west-1"
  acceptanceCriteria:
    awsAccountOperatorAccount:
      namespace: aws-account-operator

• .spec.id is the Service ID of the VPC Endpoint Service to connect to
• .spec.assumeRoleArn is the IAM role in the account of the Endpoint Service that grants permission to handle acceptance
• .spec.region is the AWS region where the Endpoint Service resides

FedRAMP Cluster Deployments

AVO is currently deployed to all FedRAMP clusters through App Interface using the template in this repo and OLM. To ensure clusters are automatically configured for Splunk log forwarding, a VPC Endpoint is created on all clusters using Managed Cluster Config.

Tangentially, AVO has a Namespace file in the FedRAMP App Interface to manage other crucial configurations:

• A ConfigMap with an AvoConfig object to enable the acceptance controller on Hives
• Two VpcEndpointAcceptance objects to handle auto-acceptance for our Splunk VPC Endpoint Service in either Gov Region

Development

Looking to work on this? See dev/README.md