terraform.azure.security.aks.azure-aks-private-clusters-enabled.azure-aks-private-clusters-enabled

profile photo of semgrepsemgrep
Author
unknown
Download Count*
LGPL Commons Clause
License

Ensure that AKS enables private clusters

Run Locally

Run in CI

Semgrep CI docs

Defintion

Edit RuleView Source
Open in Playground 
rules:
  - id: azure-aks-private-clusters-enabled
    message: "Ensure that AKS enables private clusters\t"
    patterns:
      - pattern: resource
      - pattern-not-inside: |
          resource "azurerm_kubernetes_cluster" "..." {
          ...
          private_cluster_enabled = true
          ...
          }
      - 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-private-clusters-enabled.tf

# fail
# ruleid: azure-aks-private-clusters-enabled
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"
    }
}

# fail
# ruleid: azure-aks-private-clusters-enabled
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"
    private_cluster_enabled = false
    
    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"
private_cluster_enabled = true

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

identity {
    type = "SystemAssigned"
}

tags = {
    Environment = "Production"
}
}