[jira] [Commented] (FLINK-9643) Flink allowing TLS 1.1 in spite of configuring TLS 1.2

["Viktor Vlasov (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLINK-9643?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16531509#comment-16531509 ] 

Viktor Vlasov commented on FLINK-9643:
--------------------------------------

I've gathered statistics (result.csv in attachments or the table in repository by the link below) about different versions behavior with openssl command. 

It has next columns:
dist - version of the Flink distributive;
jdk - version of TLS protocol pointed in java security file in parameter jdk.tls.disabledAlgorithms;
flink - version of TLS protocol pointed in Flink configuration in parameter security.tls.protocol;
request - version of TLS protocol used in openssl request;
result - 0 is a success, 1 is an error.

I've performed it on the two nodes cluster on Docker. Most of the actions are made as scripts and stored [here|[https://github.com/bioker/flink-ssl-test].] (Docker image - bioker/ubuntu is not more than simple ubuntu image with pre-installed openssh)
Keys and certificates created by official documentation instruction (with a small correction to simplifying the process).

Now I am going to perform further investigation about what of this behavior is wrong. Any comments are appreciated.

> 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
>
>
> 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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