Cloud

In this hands-on example we send end-to-end encrypted messages through Warpstream Cloud.

Ockam encrypts messages from a Producer all-of-the-way to a specific Consumer. Only that specific Consumer can decrypt these messages. This guarantees that your data cannot be observed or tampered with as it passes through Warpstream Cloud or the network where it is hosted. The operators of Warpstream Cloud can only see encrypted data in the network and in service that they operate. Thus, a compromise of the operator's infrastructure will not compromise the data stream's security, privacy, or integrity.

To learn how end-to-end trust is established, please read: “How does Ockam work?”

Run

This example requires Bash, Git, Curl, Docker, and Docker Compose. Please set up these tools for your operating system. It's also necessary to include your warpstream application key as an environment variable when running the example, example can be run as following:

# Clone the Ockam repo from Github.
git clone --depth 1 https://github.com/build-trust/ockam && cd ockam

# Navigate to this example’s directory.
cd examples/command/portals/kafka/warpstream/

# Run the example by calling the run.sh script and passing your warpstream application key as an argument, use Ctrl-C to exit at any point.
./run.sh _warpstream_application_key_

If everything runs as expected, you'll see the message: The example run was successful 🥳

Walkthrough

The run.sh script, that you ran above, and its accompanying files are full of comments and meant to be read. The example setup is only a few simple steps, so please take some time to read and explore.

Administrator

• The run.sh script calls the run function which invokes the enroll command to create a new identity, sign in to Ockam Orchestrator, set up a new Ockam project, make you the administrator of this project, and get a project membership credential.

• The run function then creates a new Kafka cluster by using your Warpstream's application key.

• An Ockam relay is then started using the Ockam Kafka addon which creates an encrypted relay that transmits Kafka messages over a secure portal.

• We then generate two new enrollment tickets, each valid for 10 minutes, and can be redeemed only once. The two tickets are meant for the Consumer and Producer, in the Ockam node that will run in Application Team’s network.

• In a typical production setup, an administrator or provisioning pipeline generates enrollment tickets and gives them to nodes that are being provisioned. In our example, the run function is acting on your behalf as the administrator of the Ockam project. It creates a Kafka relay using a pre-baked Ockam Kafka addon which will host the Warpstream Kafka server and Application Team’s network, passing them their tickets using environment variables.

• For the Application team, the run function takes the enrollment tickets, sets them as the value of an environment variable, passes the Warpstream authentication variables and invokes docker-compose to create the Application Teams’s networks.

Application Teams

# Create a dedicated and isolated virtual network for application_team.
networks:
  application_team:
      driver: bridge

• Application Teams’s docker-compose configuration is used when run.sh invokes docker-compose. It creates an isolated virtual network for Application Teams. In this network, docker compose starts a Kafka Consumer container and a Kafka Producer container.

• The Kafka consumer node container is created using this dockerfile and this entrypoint script. The consumer enrollment ticket from run.sh is passed to the container via environment variable.

• When the Kafka consumer node container starts in the Application Teams network, it runs its entrypoint. The entrypoint enrolls with your project and then calls the Ockam kafka-consumer command which starts the Kafka inlet and listens and traffic connection on localhost port 9092 through Ockam relay.

• Next, the entrypoint at the end executes the command present in the docker-compose configuration, which launches a Kafka consumer waiting for messages in the demo topic. Once the messages are received, they are printed out.

• In the producer container, the process is analogous, once the Ockam kafka-producer inlet is set up, the command within docker-compose configuration launches a Kafka producer that sends messages.

Recap

We sent end-to-end encrypted messages through Warpstream cloud.

Messages are encrypted with strong forward secrecy as soon as they leave a Producer, and only the intended Consumer can decrypt those messages. Warpstream Cloud and other Consumers can only see encrypted messages.

All communication is mutually authenticated and authorized. Keys and credentials are automatically rotated. Access can be easily revoked.

Cleanup

To delete all containers and images:

./run.sh cleanup _warpstream_application_key