Ensure storage for critical data are encrypted with CMKs

Error: Storage for critical data are not encrypted with Customer Managed Key

Bridgecrew Policy ID: BC_AZR_GENERAL_32
Checkov Check ID: CKV2_AZURE_1
Severity: HIGH

Storage for critical data are not encrypted with Customer Managed Key

Description

Enable sensitive data encryption at rest using Customer Managed Keys (CMKs) rather than Microsoft Managed keys. By default, data in the storage account is encrypted using Microsoft Managed Keys at rest. All Azure Storage resources are encrypted, including blobs, disks, files, queues, and tables. All object metadata is also encrypted. However, if you want to control and manage this encryption key yourself, you can specify a customer-managed key, that key is used to protect and control access to the key that encrypts your data. You can also choose to automatically update the key version used for Azure Storage encryption whenever a new version is available in the associated Key Vault.

Fix - Buildtime

Terraform

  • Resource: azurerm_resource_group, azurerm_key_vault, azurerm_key_vault_access_policy, azurerm_key_vault_key, azurerm_storage_account, azurerm_storage_account_customer_managed_key
data "azurerm_client_config" "current" {}

resource "azurerm_resource_group" "example" {
  name     = "example-resources"
  location = "West Europe"
}

resource "azurerm_key_vault" "example" {
  name                = "examplekv"
  location            = azurerm_resource_group.example.location
  resource_group_name = azurerm_resource_group.example.name
  tenant_id           = data.azurerm_client_config.current.tenant_id
  sku_name            = "standard"

  purge_protection_enabled = true
}

resource "azurerm_key_vault_access_policy" "client" {
  key_vault_id = azurerm_key_vault.example.id
  tenant_id    = data.azurerm_client_config.current.tenant_id
  object_id    = data.azurerm_client_config.current.object_id

  key_permissions    = ["get", "create", "delete", "list", "restore", "recover", "unwrapkey", "wrapkey", "purge", "encrypt", "decrypt", "sign", "verify"]
  secret_permissions = ["get"]
}

resource "azurerm_key_vault_key" "example" {
  name         = "tfex-key"
  key_vault_id = azurerm_key_vault.example.id
  key_type     = "RSA"
  key_size     = 2048
  key_opts     = ["decrypt", "encrypt", "sign", "unwrapKey", "verify", "wrapKey"]

  depends_on = [
    azurerm_key_vault_access_policy.client
  ]
}


resource "azurerm_storage_account" "ok_storage_account" {
  name                     = "examplestor"
  resource_group_name      = azurerm_resource_group.example.name
  location                 = azurerm_resource_group.example.location
  account_tier             = "Standard"
  account_replication_type = "GRS"

  identity {
    type = "SystemAssigned"
  }
}


resource "azurerm_storage_account_customer_managed_key" "ok_cmk" {
  storage_account_id = azurerm_storage_account.ok_storage_account.id
  key_vault_id       = azurerm_key_vault.example.id
  key_name           = azurerm_key_vault_key.example.name
}

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