Enable API token authentication in Dapr

Require every incoming API request for Dapr to include an authentication token before allowing that request to pass through

By default, Dapr relies on the network boundary to limit access to its public API. If you plan on exposing the Dapr API outside of that boundary, or if your deployment demands an additional level of security, consider enabling the token authentication for Dapr APIs. This will cause Dapr to require every incoming gRPC and HTTP request for its APIs for to include authentication token, before allowing that request to pass through.

Create a token

Dapr uses shared tokens for API authentication. You are free to define the API token to use.

Although Dapr does not impose any format for the shared token, a good idea is to generate a random byte sequence and encode it to Base64. For example, this command generates a random 32-byte key and encodes that as Base64:

  1. openssl rand 16 | base64

Configure API token authentication in Dapr

The token authentication configuration is slightly different for either Kubernetes or self-hosted Dapr deployments:

Self-hosted

In self-hosting scenario, Dapr looks for the presence of DAPR_API_TOKEN environment variable. If that environment variable is set when the daprd process launches, Dapr enforces authentication on its public APIs:

  1. export DAPR_API_TOKEN=<token>

To rotate the configured token, update the DAPR_API_TOKEN environment variable to the new value and restart the daprd process.

Kubernetes

In a Kubernetes deployment, Dapr leverages Kubernetes secrets store to hold the shared token. To configure Dapr APIs authentication, start by creating a new secret:

  1. kubectl create secret generic dapr-api-token --from-literal=token=<token>

Note, the above secret needs to be created in each namespace in which you want to enable Dapr token authentication.

To indicate to Dapr to use that secret to secure its public APIs, add an annotation to your Deployment template spec:

  1. annotations:
  2.   dapr.io/enabled: "true"
  3.   dapr.io/api-token-secret: "dapr-api-token" # name of the Kubernetes secret

When deployed, Dapr sidecar injector will automatically create a secret reference and inject the actual value into DAPR_API_TOKEN environment variable.

Rotate a token

Self-hosted

To rotate the configured token in self-hosted, update the DAPR_API_TOKEN environment variable to the new value and restart the daprd process.

Kubernetes

To rotate the configured token in Kubernetes, update the previously-created secret with the new token in each namespace. You can do that using kubectl patch command, but a simpler way to update these in each namespace is by using a manifest:

  1. apiVersion: v1
  2. kind: Secret
  3. metadata:
  4.   name: dapr-api-token
  5. type: Opaque
  6. data:
  7.   token: <your-new-token>

And then apply it to each namespace:

  1. kubectl apply --file token-secret.yaml --namespace <namespace-name>

To tell Dapr to start using the new token, trigger a rolling upgrade to each one of your deployments:

  1. kubectl rollout restart deployment/<deployment-name> --namespace <namespace-name>

Assuming your service is configured with more than one replica, the key rotation process does not result in any downtime.

Adding API token to client API invocations

Once token authentication is configured in Dapr, all clients invoking Dapr API need to append the dapr-api-token token to every request.

Note: The Dapr SDKs read the DAPR_API_TOKEN environment variable and set it for you by default.

Dapr API token authentication - 图1

HTTP

In case of HTTP, Dapr requires the API token in the dapr-api-token header. 例如：

  1. GET http://<daprAddress>/v1.0/metadata
  2. dapr-api-token: <token>

Using curl, you can pass the header using the --header (or -H) option. 例如：

  1. curl http://localhost:3500/v1.0/metadata \
  2.   --header "dapr-api-token: my-token"

gRPC

When using gRPC protocol, Dapr will inspect the incoming calls for the API token on the gRPC metadata:

  1. dapr-api-token[0].

Accessing the token from the app

Kubernetes

In Kubernetes, it’s recommended to mount the secret to your pod as an environment variable, as shown in the example below, where a Kubernetes secret with the name dapr-api-token is used to hold the token.

  1. containers:
  2.   - name: mycontainer
  3.     image: myregistry/myapp
  4.     envFrom:
  5.     - secretRef:
  6.       name: dapr-api-token

Self-hosted

In self-hosted mode, you can set the token as an environment variable for your app:

  1. export DAPR_API_TOKEN=<my-dapr-token>