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https://issues.apache.org/jira/browse/FLINK-10371?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16623257#comment-16623257
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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_r219416570
 
 

 ##########
 File path: 
flink-runtime/src/test/java/org/apache/flink/runtime/net/SSLUtilsTest.java
 ##########
 @@ -78,6 +78,29 @@ public void checkEnableSSL() {
                assertFalse(SSLUtils.isRestSSLEnabled(precedence));
        }
 
+       /**
+        * Tests whether activation of REST mutual SSL authentication evaluates 
the config flags correctly.
+        */
+       @SuppressWarnings("deprecation")
 
 Review comment:
   Which method is `deprecated`?

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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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