azure-appservice-entra-id-missing: Azure App Service Microsoft Entra ID Not Configured

id: azure-appservice-entra-id-missing
info:
  name: Azure App Service Microsoft Entra ID Not Configured
  author: princechaddha
  severity: medium
  description: |
    Ensure that registration with Microsoft Entra ID is enabled for Microsoft Azure App Service web applications so that your applications can connect to other Azure cloud services securely without the need of access credentials such as user names and passwords.
  impact: |
    If the Microsoft Entra ID is not configured, it could prevent secure and simplified access to cloud services, potentially leading to manual management of credentials and increased security risks.
  remediation: |
    Enable the Microsoft Entra ID for Azure App Services to ensure secure connectivity to other Azure services without manual credential handling.
  reference:
    - https://docs.microsoft.com/en-us/azure/app-service/overview-managed-identity
  tags: cloud,devops,azure,microsoft,appservice,azure-cloud-config

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

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

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

  - engine:
      - sh
      - bash
    source: |
      az webapp identity show --ids "$ids" --query 'principalId' --output json

    matchers:
      - type: word
        part: all
        words:
          - ""

    extractors:
      - type: dsl
        dsl:
          - 'id + " does not have Microsoft Entra ID configured"'
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