azure-apim-user-assigned-id-not-used: Azure API Management User-Assigned Managed Identity Not Configured

id: azure-apim-user-assigned-id-not-used
info:
  name: Azure API Management User-Assigned Managed Identity Not Configured
  author: princechaddha
  severity: medium
  description: |
    Ensure that your Azure API Management service instances are using user-assigned managed identities for fine-grained control over access permissions. This helps in maintaining proper security practices by providing specific identities for applications.
  impact: |
    Using system-assigned managed identities may result in broader than necessary permissions, potentially leading to security risks if the identity is compromised.
  remediation: |
    Configure user-assigned managed identities for your Azure API Management service instances to ensure only the necessary permissions are granted to each service.
  reference:
    - https://docs.microsoft.com/en-us/azure/api-management/how-to-use-managed-service-identity
  tags: cloud,devops,azure,microsoft,apim,azure-cloud-config

flow: |
  code(1);
  for (let APIMData of iterate(template.apimList)) {
    APIMData = JSON.parse(APIMData);
    set("name", APIMData.name);
    set("resourceGroup", APIMData.resourceGroup);
    code(2);
  }

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

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

  - engine:
      - sh
      - bash
    source: |
      az apim show --name "$name" --resource-group "$resourceGroup" --query 'identity.type'

    matchers-condition: and
    matchers:
      - type: word
        words:
          - 'SystemAssigned'
          - 'none'

    extractors:
      - type: dsl
        dsl:
          - 'name + " in " + resourceGroup + " does not use user-assigned managed identities"'
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