azure-storage-cmk-not-used: Azure Storage Account Not Using CMK

id: azure-storage-cmk-not-used
info:
  name: Azure Storage Account Not Using CMK
  author: princechaddha
  severity: high
  description: |
    Ensure that your Microsoft Azure Storage accounts are using Customer Managed Keys (CMKs) instead of Microsoft Managed Keys (i.e., default keys used by Microsoft Azure for data encryption), in order to have more granular control over your Azure Storage data encryption and decryption process.
  impact: |
    Not using Customer Managed Keys can limit your control over data encryption and decryption processes, potentially leading to security vulnerabilities.
  remediation: |
    Configure your Azure Storage accounts to use Customer Managed Keys for data encryption to enhance security and control.
  reference:
    - https://docs.microsoft.com/en-us/azure/storage/common/storage-encryption-keys-manage?tabs=portal
  tags: cloud,devops,azure,microsoft,azure-storage,azure-cloud-config

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

self-contained: true
code:
  - engine:
      - sh
      - bash
    source: |
      az storage account list --query '[*].{"Name":name}'

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

  - engine:
      - sh
      - bash
    source: |
      az storage account show --name "$name" --query 'encryption.keyVaultProperties.keyName'

    matchers:
      - type: word
        words:
          - ''

    extractors:
      - type: dsl
        dsl:
          - '"Storage account " + name + " is not using CMKs for encryption"'
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