azure-appservice-always-on-disabled: Azure App Service Always On Disabled

id: azure-appservice-always-on-disabled
info:
  name: Azure App Service Always On Disabled
  author: princechaddha
  severity: medium
  description: |
    Ensure that your Microsoft Azure App Services web applications have Always On feature enabled in order to prevent applications from being idled out due to inactivity. Always On keeps your websites/web applications loaded even when there's no traffic.
  impact: |
    Disabling Always On may lead to your web applications being unloaded during periods of inactivity, potentially causing delayed responses to incoming traffic and impacting user experience.
  remediation: |
    Enable the Always On feature for your Azure App Services web applications to ensure they remain active and responsive at all times.
  reference:
    - https://docs.microsoft.com/en-us/azure/app-service/configure-common
  tags: cloud,devops,azure,microsoft,appservice,azure-cloud-config

flow: |
  code(1);
  for (let WebAppData of iterate(template.webAppList)) {
    set("ids", WebAppData);
    code(2);
  }

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

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

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

    matchers:
      - type: word
        words:
          - "false"

    extractors:
      - type: dsl
        dsl:
          - '"Always On feature is disabled for WebApp with ID: " + id'
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