Using nodetool (JMX) with SSL encryption 

Using nodetool with SSL encryption.

Using nodetool with SSL requires some JMX setup. Changes to cassandra-env.sh are required, and a configuration file, ~/.cassandra/nodetool-ssl.properties, is created.

The location of the cassandra-env.sh file depends on the type of installation:
DataStax Enterprise 5.0 Installer-Services and package installations /etc/dse/cassandra/cassandra-env.sh
DataStax Enterprise 5.0 Installer-No Services and tarball installations install_location/resources/cassandra/conf/cassandra-env.sh
Cassandra package installations /etc/cassandra/cassandra-env.sh
Cassandra tarball installations install_location/conf/cassandra-env.sh

Prerequisites

Prepare SSL certificates with a self-signed CA for production, or prepare SSL certificates for development. Additionally, configure client-to-node encryption.

Procedure

  1. First, follow steps #1-8 in Enabling JMX authentication and authorization if authentication and authorization are required.
  2. To run nodetool with SSL encryption, some additional changes are required to cassandra-env.sh. The following settings must be added to the file. Use the file path to the keystore and truststore, and appropriate passwords for each file. These changes must be made on each node in the cluster.
    For production:
    JVM_OPTS="$JVM_OPTS -Dcom.sun.management.jmxremote.ssl=true"
      JVM_OPTS="$JVM_OPTS -Dcom.sun.management.jmxremote.ssl.need.client.auth=true"
      JVM_OPTS="$JVM_OPTS -Dcom.sun.management.jmxremote.registry.ssl=true"
      #JVM_OPTS="$JVM_OPTS -Dcom.sun.management.jmxremote.ssl.enabled.protocols=<enabled-protocols>"
      #JVM_OPTS="$JVM_OPTS -Dcom.sun.management.jmxremote.ssl.enabled.cipher.suites=<enabled-cipher-suites>"
      
      JVM_OPTS="$JVM_OPTS -Djavax.net.ssl.keyStore=/usr/local/lib/cassandra/conf/server-keystore.jks"
      JVM_OPTS="$JVM_OPTS -Djavax.net.ssl.keyStorePassword=myKeyPass"
      JVM_OPTS="$JVM_OPTS -Djavax.net.ssl.trustStore=/usr/local/lib/cassandra/conf/server-truststore.jks"
      JVM_OPTS="$JVM_OPTS -Djavax.net.ssl.trustStorePassword=truststorePass"
    For development:
       JVM_OPTS="$JVM_OPTS -Dcom.sun.management.jmxremote.ssl=true"
      JVM_OPTS="$JVM_OPTS -Dcom.sun.management.jmxremote.ssl.need.client.auth=true"
      JVM_OPTS="$JVM_OPTS -Dcom.sun.management.jmxremote.registry.ssl=true"
      #JVM_OPTS="$JVM_OPTS -Dcom.sun.management.jmxremote.ssl.enabled.protocols=<enabled-protocols>"
      #JVM_OPTS="$JVM_OPTS -Dcom.sun.management.jmxremote.ssl.enabled.cipher.suites=<enabled-cipher-suites>"
    
      JVM_OPTS="$JVM_OPTS -Djavax.net.ssl.keyStore=keystore.node0"
      JVM_OPTS="$JVM_OPTS -Djavax.net.ssl.keyStorePassword=cassandra"
      JVM_OPTS="$JVM_OPTS -Djavax.net.ssl.trustStore=truststore.node0"
      JVM_OPTS="$JVM_OPTS -Djavax.net.ssl.trustStorePassword=cassandra"

    Enable SSL for JMX by setting com.sun.management.jmxremote.ssl to true. If two-way certificate authentication is desired, set com.sun.management.jmxremote.ssl.need.client.auth to true. If com.sun.management.jmxremote.registry.ssl is set to true, an RMI registry protected by SSL will be created and configured by the out-of-the-box management agent when the Java VM is started. If the com.sun.management.jmxremote.registry.ssl property is set to true, to have full security then com.sun.management.jmxremote.ssl.need.client.auth must also be enabled. Set appropriate paths to the keystore and truststore files. Set the passwords to the passwords set during keystore and truststore generation.

  3. Restart Cassandra.
  4. To run nodetool with SSL encryption, create a .cassandra/nodetool-ssl.properties file in your home or client program directory with the following settings on the node on which nodetool will run.
    For production:
    -Dcom.sun.management.jmxremote.ssl=true
    -Dcom.sun.management.jmxremote.ssl.need.client.auth=true
    -Dcom.sun.management.jmxremote.registry.ssl=true  
    -Djavax.net.ssl.keyStore=/usr/local/lib/cassandra/conf/server-keystore.jks
    -Djavax.net.ssl.keyStorePassword=myKeyPass
    -Djavax.net.ssl.trustStore=/usr/local/lib/cassandra/conf/server-truststore.jks
    -Djavax.net.ssl.trustStorePassword=truststorePass

    For development:

    -Djavax.net.ssl.keyStore=keystore.node0
    -Djavax.net.ssl.keyStorePassword=cassandra
    -Djavax.net.ssl.trustStore=truststore.node0
    -Djavax.net.ssl.trustStorePassword=cassandra
    -Dcom.sun.management.jmxremote.ssl.need.client.auth=true
    -Dcom.sun.management.jmxremote.registry.ssl=true
  5. Start nodetool with the --ssl option for encrypted connection for any nodetool operation.
    $ nodetool --ssl info ## Package installations
    $ install_location/bin/nodetool -ssl info ## Tarball installations
  6. Start nodetool with the --ssl option for encrypted connection and a username and password for authentication and authorization for any nodetool operation.
    $ nodetool --ssl -u cassandra -pw cassandra status ## Package installations
    $ install_location/bin/nodetool -ssl -u cassandra -pw cassandra status ## Tarball installations