terraform.azure.security.aks.azure-aks-apiserver-auth-ip-ranges.azure-aks-apiserver-auth-ip-ranges

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Ensure AKS has an API Server Authorized IP Ranges enabled

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Defintion

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rules:
  - id: azure-aks-apiserver-auth-ip-ranges
    message: "Ensure AKS has an API Server Authorized IP Ranges enabled\t"
    patterns:
      - pattern: resource
      - pattern-not-inside: |
          resource "azurerm_kubernetes_cluster" "..." {
          ...
          api_server_authorized_ip_ranges = ["..."]
          ...
          }
      - pattern-inside: |
          resource "azurerm_kubernetes_cluster" "..." {
          ...
          }
    metadata:
      owasp:
        - A05:2017 - Broken Access Control
        - A01:2021 - Broken Access Control
      cwe:
        - "CWE-284: Improper Access Control"
      category: security
      technology:
        - terraform
        - azure
      references:
        - https://owasp.org/Top10/A01_2021-Broken_Access_Control
      subcategory:
        - audit
      likelihood: LOW
      impact: LOW
      confidence: LOW
      license: Commons Clause License Condition v1.0[LGPL-2.1-only]
      vulnerability_class:
        - Improper Authorization
    languages:
      - hcl
    severity: WARNING

Examples

azure-aks-apiserver-auth-ip-ranges.tf

# pass
resource "azurerm_kubernetes_cluster" "enabled" {
  name                = "example"
  location            = "azurerm_resource_group.example.location"
  resource_group_name = "azurerm_resource_group.example.name"
  dns_prefix          = "example"

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

  identity {
    type = "SystemAssigned"
  }

  api_server_authorized_ip_ranges = ["192.168.0.0/16"]
}

# fail
# ruleid: azure-aks-apiserver-auth-ip-ranges
resource "azurerm_kubernetes_cluster" "default" {
  name                = "example"
  location            = "azurerm_resource_group.example.location"
  resource_group_name = "azurerm_resource_group.example.name"
  dns_prefix          = "example"

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

  identity {
    type = "SystemAssigned"
  }
}

# fail
# ruleid: azure-aks-apiserver-auth-ip-ranges
resource "azurerm_kubernetes_cluster" "empty" {
  name                = "example"
  location            = "azurerm_resource_group.example.location"
  resource_group_name = "azurerm_resource_group.example.name"
  dns_prefix          = "example"

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

  identity {
    type = "SystemAssigned"
  }

  api_server_authorized_ip_ranges = []
}