Kuma Star

Careful!

You are browsing documentation for the next version of Kuma. Use this version at your own risk.

MeshTrafficPermission

This policy uses new policy matching algorithm. Do not combine with TrafficPermission.

TargetRef support matrix

targetRef Allowed kinds
targetRef.kind Mesh, MeshSubset, MeshService, MeshServiceSubset
from[].targetRef.kind Mesh, MeshSubset, MeshServiceSubset

If you don’t understand this table you should read matching docs.

Configuration

Action

Kuma allows configuring one of 3 actions for a group of service’s clients:

  • Allow - allows incoming requests matching the from targetRef.
  • Deny - denies incoming requests matching the from targetRef
  • AllowWithShadowDeny - same as Allow but will log as if request is denied, this is useful for rolling new restrictive policies without breaking things.

Examples

Service ‘payments’ allows requests from ‘orders’

apiVersion: kuma.io/v1alpha1
kind: MeshTrafficPermission
metadata:
  namespace: kuma-system
  name: allow-orders
spec:
  targetRef: # 1
    kind: MeshService
    name: payments
  from:
    - targetRef: # 2
        kind: MeshSubset
        tags:
           kuma.io/service: orders
      default: # 3
        action: Allow

Explanation

  1. Top level targetRef selects data plane proxies that implement payments service. MeshTrafficPermission allow-orders will be configured on these proxies.

     targetRef: # 1
   kind: MeshService
   name: payments

  2. TargetRef inside the from array selects proxies that implement order service. These proxies will be subjected to the action from default.action.

     - targetRef: # 2
     kind: MeshSubset
     tags: 
       kuma.io/service: orders

  3. The action is Allow. All requests from service orders will be allowed on service payments.

     default: # 3
   action: Allow

Deny all

apiVersion: kuma.io/v1alpha1
kind: MeshTrafficPermission
metadata:
  namespace: kuma-system
  name: deny-all
spec:
  targetRef: # 1
    kind: Mesh
  from:
    - targetRef: # 2
        kind: Mesh
      default: # 3
        action: Deny

Explanation

  1. Top level targetRef selects all proxies in the mesh.

     targetRef: # 1
   kind: Mesh

  2. TargetRef inside the from array selects all clients.

     - targetRef: # 2
     kind: Mesh

  3. The action is Deny. All requests from all services will be denied on all proxies in the default mesh.

     default: # 3
   action: Deny

Allow all

apiVersion: kuma.io/v1alpha1
kind: MeshTrafficPermission
metadata:
  name: allow-all
  namespace: kuma-system
  labels:
    kuma.io/mesh: default
spec:
  targetRef:
    kind: Mesh
  from:
  - targetRef:
      kind: Mesh
    default:
      action: Allow

Explanation

  1. Top level targetRef selects all proxies in the mesh.

     targetRef: # 1
   kind: Mesh

  2. targetRef inside the element of the from array selects all clients within the mesh.

     - targetRef: # 2
     kind: Mesh

  3. The action is Allow. All requests from all services will be allow on all proxies in the default mesh.

     default: # 3
   action: Allow

Allow requests from zone ‘us-east’, deny requests from ‘dev’ environment

apiVersion: kuma.io/v1alpha1
kind: MeshTrafficPermission
metadata:
  namespace: kuma-system
  name: example-with-tags
spec:
  targetRef: # 1
    kind: Mesh
  from:
    - targetRef: # 2
        kind: MeshSubset
        tags:
          kuma.io/zone: us-east
      default: # 3
        action: Allow
    - targetRef: # 4
        kind: MeshSubset
        tags:
          env: dev
      default: # 5
        action: Deny

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

Explanation

  1. Top level targetRef selects all proxies in the mesh.

     targetRef: # 1
   kind: Mesh

  2. TargetRef inside the from array selects proxies that have label kuma.io/zone: us-east. These proxies will be subjected to the action from default.action.

     - targetRef: # 2
     kind: MeshSubset
     tags:
       kuma.io/zone: us-east

  3. The action is Allow. All requests from the zone us-east will be allowed on all proxies.

     default: # 3
   action: Allow

  4. TargetRef inside the from array selects proxies that have tags kuma.io/zone: us-east. These proxies will be subjected to the action from default.action.

     - targetRef: # 4
     kind: MeshSubset
     tags:
       env: dev

  5. The action is Deny. All requests from the env dev will be denied on all proxies.

     default: # 5
   action: Deny

Order of rules inside the from array matters. Request from the proxy that has both kuma.io/zone: east and env: dev will be denied. This is because the rule with Deny is later in the from array than any Allow rules.

All policy options