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opa bench --data rbactest.rego 'data.rbactest.allow'
+-------------------------------------------------+------------+
| samples | 22605 |
| ns/op | 47760 |
| B/op | 6269 |
| allocs/op | 112 |
| histogram_timer_rego_external_resolve_ns_75% | 400 |
| histogram_timer_rego_external_resolve_ns_90% | 500 |
| histogram_timer_rego_external_resolve_ns_95% | 500 |
| histogram_timer_rego_external_resolve_ns_99% | 871 |
| histogram_timer_rego_external_resolve_ns_99.9% | 29394 |
| histogram_timer_rego_external_resolve_ns_99.99% | 29800 |
| histogram_timer_rego_external_resolve_ns_count | 22605 |
| histogram_timer_rego_external_resolve_ns_max | 29800 |
| histogram_timer_rego_external_resolve_ns_mean | 434 |
| histogram_timer_rego_external_resolve_ns_median | 400 |
| histogram_timer_rego_external_resolve_ns_min | 200 |
| histogram_timer_rego_external_resolve_ns_stddev | 1045 |
| histogram_timer_rego_query_eval_ns_75% | 31100 |
| histogram_timer_rego_query_eval_ns_90% | 37210 |
| histogram_timer_rego_query_eval_ns_95% | 47160 |
| histogram_timer_rego_query_eval_ns_99% | 91606 |
| histogram_timer_rego_query_eval_ns_99.9% | 630561 |
| histogram_timer_rego_query_eval_ns_99.99% | 631300 |
| histogram_timer_rego_query_eval_ns_count | 22605 |
| histogram_timer_rego_query_eval_ns_max | 631300 |
| histogram_timer_rego_query_eval_ns_mean | 29182 |
| histogram_timer_rego_query_eval_ns_median | 25300 |
| histogram_timer_rego_query_eval_ns_min | 15200 |
| histogram_timer_rego_query_eval_ns_stddev | 32411 |
+-------------------------------------------------+------------+

OPA Sidecar injection

First create a namespace for your apps and enable istio and opa 

kubectl create ns opa
kubectl label namespace opa opa-istio-injection="enabled"
kubectl label namespace opa istio-injection="enabled"

Create the opa injection obects using:

kubectl create -f opa_inject.yaml

Ensure your istio mesh config has been setup to include grcp local authorizer

kubectl edit configmap istio -n istio-system

    extensionProviders:
    - envoyExtAuthzGrpc:
        port: "9191"
        service: local-opa-grpc.local
      name: opa-local

Update your rapp-provider authorization policy to use this provider:

apiVersion: security.istio.io/v1beta1
kind: AuthorizationPolicy
metadata:
  name: rapp-opa-provider-opa
  namespace: opa
spec:
  selector:
    matchLabels:
      app: rapp-opa-provider
  action: CUSTOM
  provider:
    name: "opa-local"
  rules:
  - to:
    - operation:
        paths: ["/rapp-opa-provider"]
        notPaths: ["/health"]

Run the opa_test.sh script above and you should see a message confirming your connection to the service.

Note: References to keycloak need to be updated to include the keycloak schema i.e keycloak.default