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Traffic Permissions

Traffic Permissions is an inbound policy. Dataplanes whose configuration is modified are in the destinations matcher.

This policy provides access control rules to define the traffic that is allowed within the Mesh.

Traffic permissions requires Mutual TLS enabled on the Mesh. Mutual TLS is required for Kuma to validate the service identity with data plane proxy certificates. If Mutual TLS is disabled, Kuma allows all service traffic.

The default TrafficPermission policy that Kuma creates when you install allows all communication between all services in the new Mesh. Make sure to configure your policies to allow appropriate access to each of the services in your mesh.

As of version 1.2.0, traffic permissions support the ExternalService resource. This lets you configure access control for traffic to services outside the mesh.

Usage

To specify which source services can consume which destination services, provide the appropriate values for kuma.io/service. This value is required for sources and destinations.

Match all: You can match any value of a tag by using * – for example, like version: '*'.

apiVersion: kuma.io/v1alpha1
kind: TrafficPermission
mesh: default
metadata:
  name: allow-all-traffic
spec:
  sources:
    - match:
        kuma.io/service: '*'
  destinations:
    - match:
        kuma.io/service: '*'

Apply the configuration with kubectl apply -f [..].

You can use any Tag with the sources and destinations selectors. This approach supports fine-grained access control that lets you define the right levels of security for your services.

Access to External Services

The TrafficPermission policy can also be used to restrict traffic to services outside the mesh.

Prerequisites

These settings lock down traffic to and from the mesh, which means that requests to any unknown destination are not allowed. The mesh can’t rely on mTLS, because there is no data plane proxy on the destination side.

Usage

First, define the ExternalService for a service that is not in the mesh.

apiVersion: kuma.io/v1alpha1
kind: ExternalService
mesh: default
metadata:
  name: httpbin
spec:
  tags:
    kuma.io/service: httpbin
    kuma.io/protocol: http
  networking:
    address: httpbin.org:443
    tls:
      enabled: true

Then apply the TrafficPermission policy. In the destination section, specify all the tags defined in ExternalService.

For example, to enable the traffic from the data plane proxies of service web or backend to the new ExternalService, apply:

apiVersion: kuma.io/v1alpha1
kind: TrafficPermission
mesh: default
metadata:
  name: backend-to-httpbin
spec:
  sources:
    - match:
        kuma.io/service: web_default_svc_80
    - match:
        kuma.io/service: backend_default_svc_80
  destinations:
    - match:
        kuma.io/service: httpbin

Remember, the ExternalService follows the same rules for matching policies as any other service in the mesh – Kuma selects the most specific TrafficPermission for every ExternalService.

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