mirror of https://github.com/status-im/consul.git
154 lines
5.5 KiB
Plaintext
154 lines
5.5 KiB
Plaintext
---
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layout: docs
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page_title: Delegate authorization to an external service
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description: Learn how to use the `ext-authz` Envoy extension to delegate data plane authorization requests to external systems.
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---
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# Delegate authorization to an external service
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This topic describes how to use the external authorization Envoy extension to delegate data plane authorization requests to external systems.
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## Workflow
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Complete the following steps to use the external authorization extension:
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1. Configure an `EnvoyExtensions` block in a service defaults or proxy defaults configuration entry.
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1. Apply the configuration entry.
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## Add the `EnvoyExtensions`
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Add Envoy extension configurations to a proxy defaults or service defaults configuration entry. Place the extension configuration in an `EnvoyExtensions` block in the configuration entry.
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- When you configure Envoy extensions on proxy defaults, they apply to every service.
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- When you configure Envoy extensions on service defaults, they apply to a specific service.
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Consul applies Envoy extensions configured in proxy defaults before it applies extensions in service defaults. As a result, the Envoy extension configuration in service defaults may override configurations in proxy defaults.
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The following example shows a service defaults configuration entry for the `api` service that directs the Envoy proxy to make gRPC authorization requests to the `authz` service:
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<Tabs>
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<Tab heading="HCL" group="hcl">
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<CodeBlockConfig filename="api-auth-service-defaults.hcl">
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```hcl
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Kind = "service-defaults"
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Name = "api"
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EnvoyExtensions = [
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{
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Name = "builtin/ext-authz"
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Arguments = {
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ProxyType = "connect-proxy"
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Config = {
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GrpcService = {
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Target = {
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Service = {
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Name = "authz"
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}
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}
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}
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}
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}
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}
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]
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```
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</CodeBlockConfig>
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</Tab>
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<Tab heading="JSON" group="json">
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<CodeBlockConfig filename="api-auth-service-defaults.json">
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```json
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{
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"Kind": "service-defaults",
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"Name": "api",
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"EnvoyExtensions": [{
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"Name": "builtin/ext-authz",
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"Arguments": {
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"ProxyType": "connect-proxy",
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"Config": {
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"GrpcService": {
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"Target": {
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"Service": {
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"Name": "authz"
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}
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}
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}
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}
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}
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}
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]
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}
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```
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</CodeBlockConfig>
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</Tab>
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<Tab heading="Kubernetes" group="yaml">
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<CodeBlockConfig filename="api-auth-service-defaults.yaml">
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```yaml
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apiVersion: consul.hashicorp.com/v1alpha1
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kind: ServiceDefaults
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metadata:
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name: api
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namespace: default
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spec:
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envoyExtensions:
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- name: builtin/ext-authz
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arguments:
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proxyType: connect-proxy
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config:
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grpcService:
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target:
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service:
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name: authz
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namespace: authz
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```
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</CodeBlockConfig>
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</Tab>
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</Tabs>
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Refer to the [external authorization extension configuration reference](/consul/docs/connect/proxies/envoy-extensions/configuration/ext-authz) for details on how to configure the extension.
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Refer to the [proxy defaults configuration entry reference](/consul/docs/connect/config-entries/proxy-defaults) and [service defaults configuration entry reference](/consul/docs/connect/config-entries/service-defaults) for details on how to define the configuration entries.
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!> **Warning:** Adding Envoy extensions default proxy configurations may have unintended consequences. We recommend configuring `EnvoyExtensions` in service defaults configuration entries in most cases.
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### Unsupported Envoy configuration fields
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The following Envoy configurations are not supported:
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| Configuration | Workaround |
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| --- | --- |
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| `deny_at_disable` | Disable filter by removing it from the service’s configuration in the configuration entry. |
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| `failure_mode_allow` | Set the `EnvoyExtension.Required` field to `true` in the [service defaults configuration entry](/consul/docs/connect/config-entries/service-defaults#envoyextensions) or [proxy defaults configuration entry](/consul/docs/connect/config-entries/proxy-defaults#envoyextensions). |
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| `filter_enabled` | Set the `EnvoyExtension.Required` field to `true` in the [service defaults configuration entry](/consul/docs/connect/config-entries/service-defaults#envoyextensions) or [proxy defaults configuration entry](/consul/docs/connect/config-entries/proxy-defaults#envoyextensions). |
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| `filter_enabled_metadata` | Set the `EnvoyExtension.Required` field to `true` in the [service defaults configuration entry](/consul/docs/connect/config-entries/service-defaults#envoyextensions) or [proxy defaults configuration entry](/consul/docs/connect/config-entries/proxy-defaults#envoyextensions). |
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| `transport_api_version` | Consul only supports v3 of the transport API. As a result, there is no workaround for implementing the behavior of this field. |
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## Apply the configuration entry
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If your network is deployed to virtual machines, use the `consul config write` command and specify the proxy defaults or service defaults configuration entry to apply the configuration. For Kubernetes-orchestrated networks, use the `kubectl apply` command. The following example applies the extension in a proxy defaults configuration entry.
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<Tabs>
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<Tab heading="HCL" group="hcl">
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```shell-session
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$ consul config write api-auth-service-defaults.hcl
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```
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</Tab>
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<Tab heading="JSON" group="json">
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```shell-session
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$ consul config write api-auth-service-defaults.json
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```
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</Tab>
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<Tab heading="Kubernetes" group="kubernetes">
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```shell-session
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$ kubectl apply -f api-auth-service-defaults.yaml
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```
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</Tab>
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</Tabs>
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