Securing Spark connections

Communication between Spark applications and transactional nodes, masters and workers, and intercommunication between Spark drivers and executors can be encrypted. You must configure encryption on each node in your cluster.

Configuration files for Spark connection configuration

Encryption between the Spark driver and DSE is configured by enabling client encryption in cassandra.yaml.

Encryption between Spark nodes, including between the Spark master and worker, is configured by enabling Spark security in dse.yaml.

The location of the dse.yaml file depends on the type of installation:

Package installations and Installer-Services installations: /etc/dse/dse.yaml
Tarball installations and Installer-No Services installations: <installation_location>/resources/dse/conf/dse.yaml

Encryption between the Spark driver and executors in client applications is configured by enabling Spark security in the application configuration properties, or by default in spark-defaults.conf in the Spark configuration directory.

The default location of the Spark configuration files depends on the type of installation:

Package installations and Installer-Services: /etc/dse/spark/
Tarball installations and Installer-No Services: <installation_location>/resources/spark/conf

Configure Spark encrypted connections

Enable mutual authentication and encryption between Spark master and worker nodes in dse.yaml.

Mutual authentication is required to enable encryption.

In DSE 5.1.15 and later, when DSE authentication is enabled with authentication_options in dse.yaml, Spark security is enabled regardless of these settings.
1. Enable mutual authentication by setting spark_security_enabled to true.
2. Enable encryption by setting spark_security_encryption_enabled to true.
```
spark_security_enabled: true
spark_security_encryption_enabled: true
```
To encrypt communication between the Spark driver and master, DSE inherits the client to cluster connection encryption options.
The Spark web UI by default uses client-to-cluster encryption settings to enable SSL security in the web interface.

To enable SSL security separately from DSE client-to-cluster encryption, change the settings in dse.yaml under spark_ui_options. Set encryption to custom, then set the keystore settings in encryption_options.

The Spark web UI server automatically discards all cipher algorithms that end with a suffix SHA, SHA1 or MD5. If you manually specify cipher suites for encryption, make sure the specified cipher suites are not ignored by the server and are supported by the web browsers used to access the Spark web UI. For example, two 256 bit cipher suites that are supported by both the server and current web browsers are TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 and TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384.
The Spark SQL Thrift server can optionally use SSL to encrypt client connections.
Restart the node to recognize the changes.
For each Spark application, set the following client encryption options to true to enable encryption between the Spark driver and executors.

To enable encryption by default for all Spark applications modify the options in the spark-defaults.conf file in the Spark configuration directory.
- spark.authenticate: Enables or disables mutual authentication using a secret key. The default is false.
- spark.authenticate.enableSaslEncryption: Enables or disables SASL encryption between a Spark driver and its executors. The default is false.

Securing Spark connections

Configuration files for Spark connection configuration

Configure Spark encrypted connections

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