terraform.azure.security.azure-redis-cache-public-network-access-enabled.azure-redis-cache-public-network-access-enabled

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Ensure that Azure Cache for Redis disables public network access

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Defintion

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rules:
  - id: azure-redis-cache-public-network-access-enabled
    message: Ensure that Azure Cache for Redis disables public network access
    patterns:
      - pattern: resource
      - pattern-inside: |
          resource "azurerm_redis_cache" "..." {
          ...
          }
      - pattern-not-inside: |
          resource "azurerm_redis_cache" "..." {
          ...
          public_network_access_enabled = false
          ...
          }
    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-redis-cache-public-network-access-enabled.tf

# fail
# ruleid: azure-redis-cache-public-network-access-enabled
resource "azurerm_redis_cache" "example" {
    name                = "example-cache"
    location            = azurerm_resource_group.example.location
    resource_group_name = azurerm_resource_group.example.name
    capacity            = 2
    family              = "C"
    sku_name            = "Standard"
    enable_non_ssl_port = false
    minimum_tls_version = "1.2"
    public_network_access_enabled  = true
    redis_configuration {
    }
}

# fail
# ruleid: azure-redis-cache-public-network-access-enabled
resource "azurerm_redis_cache" "example" {
    name                = "example-cache"
    location            = azurerm_resource_group.example.location
    resource_group_name = azurerm_resource_group.example.name
    capacity            = 2
    family              = "C"
    sku_name            = "Standard"
    enable_non_ssl_port = false
    minimum_tls_version = "1.2"

    redis_configuration {
    }
}

# pass
resource "azurerm_redis_cache" "example" {
    name                = "example-cache"
    location            = azurerm_resource_group.example.location
    resource_group_name = azurerm_resource_group.example.name
    capacity            = 2
    family              = "C"
    sku_name            = "Standard"
    enable_non_ssl_port = false
    minimum_tls_version = "1.2"
    public_network_access_enabled  = false

    redis_configuration {
    }
}