Container Registry should use customer-managed key encryption

Medium Azure General acr-encryption

Applies to

Microsoft.ContainerRegistry/registries

What CGPulse checks

A resource passes this rule when encryption.status must equal enabled. Anything else is reported as a finding with the evaluated property value attached as evidence.

How to fix it

Configure customer-managed keys via Key Vault for full control over encryption key lifecycle. In Azure Portal: Container Registry > Encryption > select Customer-managed key. See: https://learn.microsoft.com/en-us/azure/container-registry/tutorial-customer-managed-keys

CLI

az acr show --ids "{id}" --query "encryption" -o json

Bicep

// CMK requires Premium SKU and a Key Vault key

param keyVaultUri string
param keyName string

resource acr 'Microsoft.ContainerRegistry/registries@2023-11-01-preview' = {{
  name: '{name}'
  location: resourceGroup().location
  sku: {{ name: 'Premium' }}
  properties: {{
    encryption: {{
      status: 'enabled'
      keyVaultProperties: {{
        keyIdentifier: '${{keyVaultUri}}/keys/${{keyName}}'
      }}
    }}
  }}
}}

Terraform

# CMK requires Premium SKU and a Key Vault key
resource "azurerm_container_registry" "{name}" {
  name                = "{name}"
  resource_group_name = "{rg}"
  location            = var.location
  sku                 = "Premium"
  encryption {
    key_vault_key_id   = "<key-vault-key-id>"
    identity_client_id = "<user-assigned-identity-client-id>"
  }
}

Compliance frameworks

Cloud Security BaselineDP-5

Vendor documentation

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