eks-managed-policy-ecr-access: Use AWS-managed policy to access Amazon ECR Repositories

id: eks-managed-policy-ecr-access

info:
  name: Use AWS-managed policy to access Amazon ECR Repositories
  author: princechaddha
  severity: high
  description: |
    Ensure that all EKS cluster node groups use the "AmazonEC2ContainerRegistryReadOnly" managed policy to access Amazon ECR repositories. This policy provides read-only access to Amazon EC2 Container Registry (ECR) repositories.
  impact: |
    Without the AmazonEC2ContainerRegistryReadOnly policy, EKS node groups cannot pull container images from ECR repositories, which will prevent pods from starting and running properly.
  remediation: |
    Attach the AmazonEC2ContainerRegistryReadOnly policy to the IAM role associated with your EKS node groups using either the AWS Console or AWS CLI.
  reference:
    - https://www.trendmicro.com/cloudoneconformity/knowledge-base/aws/EKS/managed-policy-ecr-access.html
    - https://docs.aws.amazon.com/AmazonECR/latest/userguide/ecr_managed_policies.html
  tags: cloud,devops,aws,amazon,eks,aws-cloud-config

variables:
  region: "us-east-1"

flow: |
  code(1)
  for(let cluster of iterate(template.clusters)){
    set("cluster", cluster)
    code(2)
    for(let nodegroup of iterate(template.nodegroups)){
      set("nodegroup", nodegroup)
      code(3)
      code(4)
    }
  }

self-contained: true

code:
  - engine:
      - sh
      - bash
    source: |
      aws eks list-clusters --region $region --query 'clusters' --output json

    extractors:
      - type: json
        name: clusters
        internal: true
        json:
          - '.[]'

  - engine:
      - sh
      - bash
    source: |
      aws eks list-nodegroups --region $region --cluster-name $cluster --query 'nodegroups' --output json

    extractors:
      - type: json
        name: nodegroups
        internal: true
        json:
          - '.[]'

  - engine:
      - sh
      - bash
    source: |
      aws eks describe-nodegroup --region $region --cluster-name $cluster --nodegroup-name $nodegroup --query 'nodegroup.nodeRole' --output json

    extractors:
      - type: json
        name: rolearn
        internal: true
        json:
          - '.'

  - engine:
      - sh
      - bash
    source: |
      aws iam list-attached-role-policies --role-name $(echo $rolearn | cut -d'/' -f2) --query 'AttachedPolicies[*].PolicyArn' --output json

    matchers-condition: and
    matchers:
      - type: word
        words:
          - "arn:aws:iam::aws:policy/AmazonEC2ContainerRegistryReadOnly"
        negative: true

      - type: word
        words:
          - "["

    extractors:
      - type: dsl
        dsl:
          - '"EKS node group " + nodegroup + " in cluster " + cluster + " does not have AmazonEC2ContainerRegistryReadOnly policy attached to its IAM role"'
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