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specify-network-acl

Default Severity: critical

Explanation

Network ACLs allow you to reduce your exposure to risk by limiting what can access your key vault.

The default action of the Network ACL should be set to deny for when IPs are not matched. Azure services can be allowed to bypass.

Possible Impact

Without a network ACL the key vault is freely accessible

Suggested Resolution

Set a network ACL for the key vault

Insecure Example

The following example will fail the azure-keyvault-specify-network-acl check. 

 resource "azurerm_key_vault" "bad_example" {
     name                        = "examplekeyvault"
     location                    = azurerm_resource_group.bad_example.location
     enabled_for_disk_encryption = true
     soft_delete_retention_days  = 7
     purge_protection_enabled    = false
 }

Secure Example

The following example will pass the azure-keyvault-specify-network-acl check. 

 resource "azurerm_key_vault" "good_example" {
     name                        = "examplekeyvault"
     location                    = azurerm_resource_group.good_example.location
     enabled_for_disk_encryption = true
     soft_delete_retention_days  = 7
     purge_protection_enabled    = false

     network_acls {
         bypass = "AzureServices"
         default_action = "Deny"
     }
 }