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From "Till Rohrmann (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-9643) Flink allowing TLS 1.1 in spite of configuring TLS 1.2
Date Thu, 12 Jul 2018 11:20:00 GMT

    [ https://issues.apache.org/jira/browse/FLINK-9643?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16541486#comment-16541486
] 

Till Rohrmann commented on FLINK-9643:
--------------------------------------

Just to understand the conclusion of your investigation: Flink 1.4 and 1.5 are not affected
by this problem. Is this right?

If this is the case, then the problem could be fixed in the 1.3 release branch. Officially,
the community only supports the two latest releases (1.4 and 1.5). Thus, we would recommend
everyone to upgrade to either of these versions. 

> 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
>            Reporter: Vinay
>            Assignee: Viktor Vlasov
>            Priority: Major
>         Attachments: result.csv, result2_rpc.csv, result_2.csv, test.png
>
>
> 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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