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https://issues.apache.org/jira/browse/FLINK-9643?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16534970#comment-16534970
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Viktor Vlasov commented on FLINK-9643:
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I think that my assumption about _The protocol in both cases set the maximum of
the supported version, not exactly value._ was incorrect. Now I figured out
that in case of Netty connection
[here|https://github.com/apache/flink/blob/04e4c8522eb28573f54a9cec7b1559e9c3d0f7aa/flink-runtime/src/main/java/org/apache/flink/runtime/io/network/netty/NettyServer.java#L156]
it overrides all algorithms was set before. I keep investigation...
> Flink allowing TLS 1.1 in spite of configuring TLS 1.2
> ------------------------------------------------------
>
> Key: FLINK-9643
> URL: https://issues.apache.org/jira/browse/FLINK-9643
> Project: Flink
> Issue Type: Bug
> Components: Security
> Affects Versions: 1.3.2, 1.5.0, 1.4.2
> Reporter: Vinay
> Assignee: Viktor Vlasov
> Priority: Major
> Attachments: result.csv, result_2.csv
>
>
> I have deployed Flink 1.3.2 and enabled SSL settings. From the ssl debug
> logs it shows that Flink is using TLSv1.2. However based on the security
> scans we have observed that it also allows TLSv1.0 and TLSv1.1.
>
> In order to strictly use TLSv1.2 we have updated the following property of
> java.security file:
> jdk.tls.disabledAlgorithms=MD5, SSLv3, DSA, RSA keySize < 2048, TLSv1,
> TLSv1.1
> But still it allows TLSv1.1 , verified this by hitting the following command
> from master node:
> openssl s_client -connect taskmanager1:<listening_address_port> -tls1
> (here listening_address_port is part of
> akka.ssl.tcp://flink@taskmanager1:port/user/taskmanager)
> Now, when I hit the above command for the data port, it does not allow
> TLSv1.1 and only allows TLSv1.2
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