presto-password-authenticators/src/main/java/io/prestosql/plugin/password/LdapAuthenticator.java/LdapAuthenticator/createEnvironment
class LdapAuthenticator:    private Map<String, String> createEnvironment(String user, String password)
    {
        return ImmutableMap.<String, String>builder()
                .putAll(basicEnvironment)
                .put(SECURITY_AUTHENTICATION, "simple")
                .put(SECURITY_PRINCIPAL, createPrincipal(user))
                .put(SECURITY_CREDENTIALS, password)
                .build();
    }