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What

This package implements an authentication plugin for the open-source Datastax Java Driver for Apache Cassandra. The driver enables you to add authentication information to your API requests using the AWS Signature Version 4 Process (SigV4). Using the plugin, you can provide users and applications short-term credentials to access Amazon Managed Apachce Cassandra Service (MCS) using AWS Identity and Access Management (IAM) users and roles.

The plugin depends on the AWS SDK for Java. It uses AWSCredentialsProvider to obtain credentials. Because the IAuthenticator interface operates at the level of InetSocketAddress, you must specify the service endpoint to use for the connection. You can provide the Region in the constructor programmatically, via the AWS_REGION environment variable, or via the aws.region system property.

The full documentation for the plugin is available at https://docs.aws.amazon.com/mcs/latest/devguide/programmatic.credentials.html#programmatic.credentials.SigV4_MCS.

Example Usage

For example code, see https://github.com/aws-samples/aws-sigv4-auth-cassandra-java-driver-examples.

Using the Plugin

The following sections describe how to use the authentication plugin for the open-source DataStax Java Driver for Cassandra to access Amazon Managed Apache Cassandra Service.

SSL Configuration

The first step is to get an Amazon digital certificate to encrypt your connections using Transport Layer Security (TLS). The DataStax Java driver must use an SSL trust store so that the client SSL engine can validate the Amazon Managed Cassandra Service certificate on connection. To use the trust store and create a certificate, see Using a Cassandra Java Client Driver to Access Amazon Managed Cassandra Service Programmatically.

Region Configuration

Before you can start using the plugin, you must configure the AWS Region that the plugin will use when authenticating. This is required because SigV4 signatures are Region-specific. For example, if you are connecting to the cassandra.us-east-2.amazonaws.com endpoint, the Region must be us-east-2. For a list of available AWS Regions and endpoints, see Service Endpoints for Amazon Managed Cassandra Service.

You can specify the Region using one of the following four methods:

  • Environment Variable
  • System Property
  • Constructor
  • Configuration

Environment Variable

You can use the AWS_REGION environment variable to match the endpoint that you are communicating with by setting it as part of your application start-up, as follows.

$ export AWS_Region=us-east-1

System Property

You can use the aws.region Java system property by specifying it on the command line, as follows.

$ java -Daws.region=us=east-1 ...

Constructor

One of the constructors for software.aws.mcs.auth.SigV4AuthProvider takes a String representing the Region that will be used for that instance.

Configuration

Set the Region explicitly in your advanced.auth-provider.class configuration (see example below), by specifying the advanced.auth-provider.aws-region property.

Add the Authentication Plugin to the Application

The authentication plugin supports version 4.x of the DataStax Java Driver for Cassandra. If you’re using Apache Maven, or a build system that can use Maven dependencies, add the following dependencies to your pom.xml file.

<dependency>
    <groupId>software.aws.mcs</groupId>
    <artifactId>aws-sigv4-auth-cassandra-java-driver-plugin</artifactId>
    <version>4.0.0</version>
</dependency>

How to use the Authentication Plugin

When using the open-source DataStax Java driver, the connection to your Amazon Managed Cassandra Service cluster is represented by the CqlSession class. To create the CqlSession, you can either configure it programmatically using the CqlSessionBuilder class (accessed via CqlSession.builder()) or with the configuration file.

Programmatically Configure the Driver

When using the DataStax Java driver, you interact with Amazon Managed Cassandra Service primarily through the CQLSession class. You can create an instance of CqlSession using the CqlSession.builder() function. CqlSession.builder() enables you to specify another authentication provider for the session by using the with withAuthProvider function.

To use the authentication plugin, you set a Region-specific instance of SigV4AuthProvider as the authentication provider, as in the following example.

  1. Call addContactPoints on the builder with a collection of java.net.InetSocketAddress instances corresponding to the endpoints for your Region. Contact points are the endpoints that the driver will connect to. For a full list of endpoints and Regions in the documentation, see Service Endpoints for Amazon Managed Cassandra Service.
  2. Add an SSL context by calling withSslContext on the builder. This uses the trust store defined previously to negotiate SSL on the connection to the endpoints. SSL is required for Amazon Managed Cassandra Service. Without this setting, connections will time out and fail.
  3. Set the local data center to the region name, in this example it is us-east-2. The local data center is used by the driver for routing of requests, and it is required when the builder is constructed with addContactPoints.
  4. Set the authentication provider to a new instance of software.aws.mcs.auth.SigV4AuthProvider. The SigV4AuthProvider is the authentication handler provided by the plugin for performing SigV4 authentication. You can specify the Region for the endpoints that you’re using in the constructor for SigV4AuthProvider, as in the following example. Or, you can set the environment variable or system property as shown previously.

The following code example demonstrates the previous steps.

    List<InetSocketAddress> contactPoints =
      Collections.singletonList(
       InetSocketAddress.createUnresolved("cassandra.us-east-2.amazonaws.com", 9142));

    try (CqlSession session = CqlSession.builder()
      .addContactPoints(contactPoints)
      .withSslContext(SSLContext.getDefault())
      .withLocalDatacenter("us-east-2")
      .withAuthProvider(new SigV4AuthProvider("us-east-2"))
      .build()) {
      // App code here...
    }

Use a Configuration File

To use the configuration file, set the advanced.auth-provider.class to software.aws.mcs.auth.SigV4AuthProvider. You can also set the region, local data center and enable SSL in the configuration.

  1. Set the advanced.auth-provider.class to software.aws.mcs.auth.SigV4AuthProvider.
  2. Set basic.load-balancing-policy.local-datacenter to the region name. In this case, use us-east-2.

The following is an example of this.

    datastax-java-driver {
        basic.load-balancing-policy {
            class = DefaultLoadBalancingPolicy
            local-datacenter = us-east-2
        }
        advanced {
            auth-provider = {
                class = software.aws.mcs.auth.SigV4AuthProvider
                aws-region = us-east-2
            }
            ssl-engine-factory {
                class = DefaultSslEngineFactory
            }
        }
    }