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Add ext-authz route example #13111

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50 changes: 50 additions & 0 deletions content/en/docs/tasks/security/authorization/authz-custom/index.md
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Expand Up @@ -232,6 +232,56 @@ The external authorizer is now ready to be used by the authorization policy.

You can now apply another authorization policy for the sample `ext-authz` server to control who is allowed to access it.

## Route with external authorization
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## Route with external authorization
## Route with external authorization

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(required to fix lint error.)

You can create a VirtualService to route your service based on external authorization headers.

1. Deploy a VirtualService `ext-authz-route`:

The following command applies a VirtualService that route all traffic to `/headers` containing a `x-ext-authz` header with value `allow` to a route, and route the rest of the traffic to `/headers` to another route.

{{< text bash >}}
$ kubectl apply -n foo -f - <<EOF
apiVersion: networking.istio.io/v1alpha3
kind: VirtualService
metadata:
name: ext-authz-route
spec:
hosts:
- httpbin.foo.svc.cluster.local
http:
- match:
- uri:
exact: "/headers"
headers:
X-Ext-Authz:
exact: allow
rewrite:
uri: "/base64/cm91dGUtYWxsb3c="
route:
- destination:
host: httpbin.foo.svc.cluster.local
- route:
- destination:
host: httpbin.foo.svc.cluster.local
rewrite:
uri: "/base64/cm91dGUtZGVueQ=="
EOF
{{< /text >}}

1. Verify a request to path `/headers` with header `x-ext-authz: allow` routes to `/base64/cm91dGUtYWxsb3c=`:

{{< text bash >}}
$ kubectl exec "$(kubectl get pod -l app=sleep -n foo -o jsonpath={.items..metadata.name})" -c sleep -n foo -- curl "http://httpbin.foo:8000/headers" -H "x-ext-authz: allow" -s
route-allow
{{< /text >}}

1. Verify a request to path `/headers` with header `x-ext-authz: deny` routes to `/base64/cm91dGUtZGVueQ==`:

{{< text bash >}}
$ kubectl exec "$(kubectl get pod -l app=sleep -n foo -o jsonpath={.items..metadata.name})" -c sleep -n foo -- curl "http://httpbin.foo:8000/headers" -H "x-ext-authz: deny" -s
route-deny
{{< /text >}}

## Clean up

1. Remove the namespace `foo` from your configuration:
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