azure-aks-network-contrib-unassigned: Azure AKS Network Contributor Role Unassigned

id: azure-aks-network-contrib-unassigned
info:
  name: Azure AKS Network Contributor Role Unassigned
  author: princechaddha
  severity: medium
  description: |
    Ensure that Azure Kubernetes Service (AKS) clusters are using the Network Contributor role for managing networking resources and accessing other Azure services within an Azure Virtual Network (VNet). The Network Contributor role enables seamless network management, facilitates service integration, and enhances overall security.
  impact: |
    If AKS clusters are not using the Network Contributor role, this may restrict their capabilities in managing network resources effectively, potentially leading to suboptimal service integration and security posture.
  remediation: |
    Ensure that the Network Contributor role is assigned to your AKS clusters within Azure to enable proper management of networking resources. This can be configured in the IAM settings of the Azure portal.
  reference:
    - https://docs.microsoft.com/en-us/azure/aks/manage-azure-rbac
  tags: cloud,devops,azure,microsoft,aks,azure-cloud-config

flow: |
  code(1);
  for (let ClusterData of iterate(template.clusterList)) {
    ClusterData = JSON.parse(ClusterData);
    set("name", ClusterData.name);
    set("resourceGroup", ClusterData.resourceGroup);
    code(2);
    for(let subscriptionNames of iterate(template.subscription)){
      set("subscription", subscriptionNames)
      code(3);
      }
    }

self-contained: true
code:
  - engine:
      - sh
      - bash
    source: |
      az aks list --output json --query '[*].{name:name, resourceGroup:resourceGroup}'

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

  - engine:
      - sh
      - bash
    source: |
      az aks show --name "$name" --resource-group "$resourceGroup" --query 'id'

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

  - engine:
      - sh
      - bash
    source: |
      az role assignment list --scope "$subscription" --output json --query '[*].roleDefinitionName'

    matchers-condition: and
    matchers:
      - type: word
        words:
          - "Network Contributor"
        negative: true

      - type: word
        words:
          - "[]"

    extractors:
      - type: dsl
        dsl:
          - 'name + " in resource group " + resourceGroup + " does not have Network Contributor role assigned"'
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