SignalR Service should require client certificates

Medium Azure General signalr-signalr-service-require-client

Applies to

Microsoft.SignalRService/signalR

What CGPulse checks

A resource passes this rule when tls.clientCertEnabled must equal true. Anything else is reported as a finding with the evaluated property value attached as evidence.

How to fix it

Enable client certificate authentication to enforce mutual TLS for connections. In Azure Portal: SignalR Service > Settings > enable client certificate authentication. See: https://learn.microsoft.com/en-us/azure/azure-signalr/howto-client-certificate

CLI

az signalr update --ids "{id}" --client-cert-enabled true

Terraform

resource "azurerm_signalr_service" "{name}" {
  name                = "{name}"
  resource_group_name = "{rg}"
  location            = var.location
  sku {
    name     = "Standard_S1"
    capacity = 1
  }
  tls_client_cert_enabled = true
}

Compliance frameworks

Cloud Security BaselineIM-4

Vendor documentation

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