Java keystores and truststores

Java keystore file for TLS

Access to the Trino coordinator must be through HTTPS when using Kerberos and LDAP authentication. The Trino coordinator uses a Java Keystore file for its TLS configuration. These keys are generated using keytool and stored in a Java Keystore file for the Trino coordinator.

The alias in the keytool command line should match the principal that the Trino coordinator uses.

You’ll be prompted for the first and last name. Use the Common Name that will be used in the certificate. In this case, it should be the unqualified hostname of the Trino coordinator. In the following example, you can see this in the prompt that confirms the information is correct:

keytool -genkeypair -alias trino -keyalg RSA -keystore keystore.jks
Enter keystore password:
Re-enter new password:
What is your first and last name?
  [Unknown]:  trino-coordinator.example.com
What is the name of your organizational unit?
  [Unknown]:
What is the name of your organization?
  [Unknown]:
What is the name of your City or Locality?
  [Unknown]:
What is the name of your State or Province?
  [Unknown]:
What is the two-letter country code for this unit?
  [Unknown]:
Is CN=trino-coordinator.example.com, OU=Unknown, O=Unknown, L=Unknown, ST=Unknown, C=Unknown correct?
  [no]:  yes

Enter key password for <trino>
        (RETURN if same as keystore password):

Java truststore file for TLS

Truststore files contain certificates of trusted TLS/SSL servers, or of Certificate Authorities trusted to identify servers. For securing access to the Trino coordinator through HTTPS, the clients can configure truststores. For the Trino CLI to trust the Trino coordinator, the coordinator’s certificate must be imported to the CLI’s truststore.

You can either import the certificate to the default Java truststore, or to a custom truststore. You should be careful, if you choose to use the default one, since you may need to remove the certificates of CAs you do not deem trustworthy.

You can use keytool to import the certificate to the truststore. In the example, we are going to import trino_certificate.cer to a custom truststore trino_trust.jks, and you get a prompt asking if the certificate can be trusted or not.

$ keytool -import -v -trustcacerts -alias trino_trust -file trino_certificate.cer -keystore trino_trust.jks -keypass <truststore_pass>

Troubleshooting

Java keystore file verification

Verify the password for a keystore file and view its contents using keytool.

$ keytool -list -v -keystore /etc/trino/trino.jks