azure-appservice-http2-not-enabled: Azure App Service HTTP/2 Not Enabled

id: azure-appservice-http2-not-enabled
info:
  name: Azure App Service HTTP/2 Not Enabled
  author: princechaddha
  severity: low
  description: |
    Ensure that your Microsoft Azure App Service web applications are using the latest version of the HTTP protocol (i.e. HTTP/2) in order to make your web applications load faster. HTTP 2.0 represents a major upgrade of the HTTP/1.1 protocol, with the primary goals of reducing the impact of latency and connection load on web servers through full request and response multiplexing, minimizing protocol overhead via HTTP header field compression, and supporting HTTP request prioritization and server push.
  impact: |
    Not using HTTP/2 can result in slower web applications due to increased latency and connection load.
  remediation: |
    Enable HTTP/2 on your Azure App Service web applications to improve their performance and adhere to modern web standards.
  reference:
    - https://docs.microsoft.com/en-us/azure/app-service/configure-language-http2
  tags: cloud,devops,azure,microsoft,appservice,azure-cloud-config

flow: |
  code(1);
  for (let WebAppId of iterate(template.webAppIds)) {
    set("id", WebAppId);
    code(2);
  }

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

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

  - engine:
      - sh
      - bash
    source: |
      az webapp config show --ids $id --query 'http20Enabled' --output json

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

    extractors:
      - type: dsl
        dsl:
          - 'id + " does not have HTTP/2 enabled"'
# digest: 4a0a00473045022100f7d0215f7672b4f0a16a3ad3d3dc1889a424e14d098ac25f20c83a7959080b9f02207240116d62fd78868d1eea9d0e9e0bad7d8bf438e0b58d30da830ae22d5d2a06:922c64590222798bb761d5b6d8e72950