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From "Viktor Vlasov (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-9643) Flink allowing TLS 1.1 in spite of configuring TLS 1.2
Date Mon, 09 Jul 2018 08:43:00 GMT

    [ https://issues.apache.org/jira/browse/FLINK-9643?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16536690#comment-16536690

Viktor Vlasov commented on FLINK-9643:

All that I've described above it's about task manager data port, and it looks right. I've
found the config parameter for RPC port and have performed test on it. 
As [~vinaypatil18] said, the problem affects only RPC port (I forgot it when been asking about
check config parameter on another machine). 
What about the next versions - neither 1.4.2 or 1.5.0 are not affected by this issue (by test
results). I am attaching the diff view of results (only 1.3.2 version has difference). 
If the version 1.3.2 is not supported now, I am wondering whether is necessary to do something


> 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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