terraform.azure.security.aks.azure-aks-uses-disk-encryptionset.azure-aks-uses-disk-encryptionset

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Ensure that AKS uses disk encryption set

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Defintion

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rules:
  - id: azure-aks-uses-disk-encryptionset
    message: Ensure that AKS uses disk encryption set
    patterns:
      - pattern: resource
      - pattern-not-inside: |
          resource "azurerm_kubernetes_cluster" "..." {
          ...
          disk_encryption_set_id = "..."
          ...
          }
      - pattern-inside: |
          resource "azurerm_kubernetes_cluster" "..." {
          ...
          }
    metadata:
      owasp:
        - A03:2017 - Sensitive Data Exposure
      cwe:
        - "CWE-320: CWE CATEGORY: Key Management Errors"
      category: security
      technology:
        - terraform
        - azure
      references:
        - https://owasp.org/Top10/A02_2021-Cryptographic_Failures
      subcategory:
        - audit
      likelihood: LOW
      impact: LOW
      confidence: LOW
      license: Commons Clause License Condition v1.0[LGPL-2.1-only]
      vulnerability_class:
        - Cryptographic Issues
    languages:
      - hcl
    severity: WARNING

Examples

azure-aks-uses-disk-encryptionset.tf

# fail
# ruleid: azure-aks-uses-disk-encryptionset
resource "azurerm_kubernetes_cluster" "example" {
    name                = "example-aks1"
    location            = azurerm_resource_group.example.location
    resource_group_name = azurerm_resource_group.example.name
    dns_prefix          = "exampleaks1"

    default_node_pool {
    name       = "default"
    node_count = 1
    vm_size    = "Standard_D2_v2"
    }

    identity {
    type = "SystemAssigned"
    }

    tags = {
    Environment = "Production"
    }
}

# pass
resource "azurerm_kubernetes_cluster" "example" {
    name                = "example-aks1"
    location            = azurerm_resource_group.example.location
    resource_group_name = azurerm_resource_group.example.name
    dns_prefix          = "exampleaks1"
    disk_encryption_set_id = "someId"
    
    default_node_pool {
    name       = "default"
    node_count = 1
    vm_size    = "Standard_D2_v2"
    }

    identity {
    type = "SystemAssigned"
    }

    tags = {
    Environment = "Production"
    }
}