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https://issues.apache.org/jira/browse/FLINK-10371?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16623254#comment-16623254
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ASF GitHub Bot commented on FLINK-10371:
----------------------------------------
tillrohrmann commented on a change in pull request #6727: [FLINK-10371] Allow
to enable SSL mutual authentication on REST endpoints by configuration
URL: https://github.com/apache/flink/pull/6727#discussion_r219416858
##########
File path:
flink-runtime/src/test/java/org/apache/flink/runtime/rest/RestServerSSLAuthITCase.java
##########
@@ -0,0 +1,138 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.flink.runtime.rest;
+
+import org.apache.flink.api.common.time.Time;
+import org.apache.flink.api.java.tuple.Tuple2;
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.configuration.RestOptions;
+import org.apache.flink.configuration.SecurityOptions;
+import org.apache.flink.runtime.rest.messages.EmptyMessageParameters;
+import org.apache.flink.runtime.rest.messages.EmptyRequestBody;
+import org.apache.flink.runtime.rest.messages.EmptyResponseBody;
+import org.apache.flink.runtime.rpc.RpcUtils;
+import org.apache.flink.runtime.webmonitor.RestfulGateway;
+import org.apache.flink.runtime.webmonitor.retriever.GatewayRetriever;
+import org.apache.flink.util.TestLogger;
+
+import org.apache.flink.shaded.netty4.io.netty.handler.codec.DecoderException;
+
+import org.junit.Test;
+
+import javax.net.ssl.SSLHandshakeException;
+
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.ExecutionException;
+import java.util.concurrent.TimeUnit;
+
+import static org.junit.Assert.assertTrue;
+import static org.junit.Assert.fail;
+import static org.mockito.Matchers.any;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.when;
+
+/**
+ * This test validates that connections are failing when mutual auth is
enabled but untrusted
+ * keys are used.
+ */
+public class RestServerSSLAuthITCase extends TestLogger {
Review comment:
Nice that the test case extends `TestLogger` 👍
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> Allow to enable SSL mutual authentication on REST endpoints by configuration
> ----------------------------------------------------------------------------
>
> Key: FLINK-10371
> URL: https://issues.apache.org/jira/browse/FLINK-10371
> Project: Flink
> Issue Type: Improvement
> Components: Client, REST, Security
> Affects Versions: 1.6.0, 1.7.0
> Reporter: Johannes Dillmann
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.7.0, 1.6.2
>
>
> With Flink 1.6 SSL mutual authentication was introduced for internal
> connectivity in FLINK-9312.
> SSL support for external connectivity was also introduced in regard to
> encryption of the connection and verification of the Flink REST endpoint from
> the client side.
> But _mutual authentication between the REST endpoint and clients is not
> supported yet_.
> The [documentation suggests
> |https://ci.apache.org/projects/flink/flink-docs-release-1.6/ops/security-ssl.html]
> using a side car proxy to enable SSL mutual auth on the REST endpoint and
> points out the advantages of using a feature rich proxy.
> While this is a good rationale, there are still important use cases for
> support of simple mutual authentication directly in Flink: Mainly support
> for using standard images in a containerized environment.
> There are tools used to setup Flink Jobs (for example on Kubernetes clusters)
> and act as gateways to the Flink REST endpoint and the Flink web interface.
> To prevent unauthorised access to Flink the connectivity has to be secured.
> As the tools acts as gateway it is easy to create and pass a shared keystore
> and truststore used for mutual authentication to the Flink instances
> configurations.
> To enable for SSL mutual authentication on REST endpoints, I am suggesting to
> add a the configuration parameter `security.ssl.rest.authentication-enabled`
> which defaults to `false`.
> If it is set to `true` the `SSLUtils` factories for creating the REST server
> endpoint and the REST clients should set authentication to required and share
> `security.ssl.rest.keystore` and `security.ssl.rest.truststore` to setup SSL
> mutual authenticated connections.
>
> I have a working prototype which I would gladly submit as a PR to get further
> feedback. The changes to Flink are minimal and the default behaviour won't
> change.
>
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