azure-vm-managed-identity-unassigned: Azure VM Managed Identity Not Assigned

id: azure-vm-managed-identity-unassigned
info:
  name: Azure VM Managed Identity Not Assigned
  author: princechaddha
  severity: medium
  description: |
    Ensure that your Microsoft Azure virtual machines (VMs) have system-assigned managed identities enabled in order to allow secure virtual machine access to Azure resources such as key vaults and storage accounts.
  impact: |
    VMs without system-assigned managed identities may have inadequate security configurations, increasing the risk of unauthorized access to Azure resources.
  remediation: |
    Enable system-assigned managed identities on all Azure VMs to ensure secure access to other Azure services.
  reference:
    - https://docs.microsoft.com/en-us/azure/active-directory/managed-identities-azure-resources/overview
  tags: cloud,devops,azure,microsoft,vm,azure-cloud-config

flow: |
  code(1);
  for (let VMData of iterate(template.vmList)) {
    VMData = JSON.parse(VMData);
    set("ids", VMData.id);
    code(2);
  }

self-contained: true
code:
  - engine:
      - sh
      - bash
    source: |
      az vm list --query '[*].{"id":id}'

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

  - engine:
      - sh
      - bash
    source: |
      az vm show --ids "$ids" --query '{"IdentityConfig": identity}'

    matchers-condition: and
    matchers:
      - type: word
        words:
          - '"IdentityConfig": null'

    extractors:
      - type: dsl
        dsl:
          - 'ids + " does not have a system-assigned managed identity enabled"'
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