Test: remove hardcoded list of unconfigured ciphers (#30367)

This commit removes the hardcoded list of unconfigured ciphers in the
SslIntegrationTests. This list may include ciphers that are not
supported on certain JVMs. This list is replaced with code that
dynamically computes the set of ciphers that are not configured for
use by default.

x-pack/plugin/security/src/test/java/org/elasticsearch/xpack/security/transport/ssl/SslIntegrationTests.java

@@ -22,11 +22,14 @@
 import org.elasticsearch.common.network.NetworkModule;
 import org.elasticsearch.common.settings.Settings;
 import org.elasticsearch.common.transport.TransportAddress;
+import org.elasticsearch.common.util.set.Sets;
 import org.elasticsearch.http.HttpServerTransport;
 import org.elasticsearch.test.SecurityIntegTestCase;
 import org.elasticsearch.transport.Transport;
 import org.elasticsearch.xpack.core.TestXPackTransportClient;
+import org.elasticsearch.xpack.core.XPackSettings;
 import org.elasticsearch.xpack.core.common.socket.SocketAccess;
+import org.elasticsearch.xpack.core.ssl.SSLConfigurationSettings;
 import org.elasticsearch.xpack.core.ssl.SSLService;
 import org.elasticsearch.xpack.security.LocalStateSecurity;
 
@@ -39,7 +42,12 @@
 import java.nio.charset.StandardCharsets;
 import java.security.KeyStore;
 import java.security.SecureRandom;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.List;
 import java.util.Locale;
+import java.util.Set;
 
 import static org.elasticsearch.test.SecuritySettingsSource.addSSLSettingsForStore;
 import static org.hamcrest.CoreMatchers.is;
@@ -65,12 +73,18 @@ protected boolean transportSSLEnabled() {
     }
 
     // no SSL exception as this is the exception is returned when connecting
-    public void testThatUnconfiguredCiphersAreRejected() {
+    public void testThatUnconfiguredCiphersAreRejected() throws Exception {
+        Set<String> supportedCiphers = Sets.newHashSet(SSLContext.getDefault().getSupportedSSLParameters().getCipherSuites());
+        Set<String> defaultXPackCiphers = Sets.newHashSet(XPackSettings.DEFAULT_CIPHERS);
+        final List<String> unconfiguredCiphers = new ArrayList<>(Sets.difference(supportedCiphers, defaultXPackCiphers));
+        Collections.shuffle(unconfiguredCiphers, random());
+        assumeFalse("the unconfigured ciphers list is empty", unconfiguredCiphers.isEmpty());
+
         try (TransportClient transportClient = new TestXPackTransportClient(Settings.builder()
                 .put(transportClientSettings())
                 .put("node.name", "programmatic_transport_client")
                 .put("cluster.name", internalCluster().getClusterName())
-                .putList("xpack.ssl.cipher_suites", "TLS_ECDH_anon_WITH_RC4_128_SHA", "SSL_RSA_WITH_3DES_EDE_CBC_SHA")
+                .putList("xpack.ssl.cipher_suites", unconfiguredCiphers)
                 .build(), LocalStateSecurity.class)) {
 
             TransportAddress transportAddress = randomFrom(internalCluster().getInstance(Transport.class).boundAddress().boundAddresses());