[jira] [Commented] (FLINK-5364) Rework JAAS configuration to support user-supplied entries

["Eron Wright (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLINK-5364?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15761960#comment-15761960 ] 

Eron Wright  commented on FLINK-5364:
-------------------------------------

[~trohrmann@apache.org] [~mxm] Bringing this to your attention as a critical fix for Flink 1.2.


> Rework JAAS configuration to support user-supplied entries
> ----------------------------------------------------------
>
>                 Key: FLINK-5364
>                 URL: https://issues.apache.org/jira/browse/FLINK-5364
>             Project: Flink
>          Issue Type: Bug
>          Components: Cluster Management
>            Reporter: Eron Wright 
>            Assignee: Eron Wright 
>            Priority: Critical
>              Labels: kerberos, security
>
> Recent issues (see linked) have brought to light a critical deficiency in the handling of JAAS configuration.   
> 1. the MapR distribution relies on an explicit JAAS conf, rather than in-memory conf used by stock Hadoop.
> 2. the ZK/Kafka/Hadoop security configuration is supposed to be independent (one can enable each element separately) but isn't.
> Perhaps we should rework the JAAS conf code to merge any user-supplied configuration with our defaults, rather than using an all-or-nothing approach.   
> We should also address some recent regressions:
> 1. The HadoopSecurityContext should be installed regardless of auth mode, to login with UserGroupInformation, which:
> - handles the HADOOP_USER_NAME variable.
> - installs an OS-specific user principal (from UnixLoginModule etc.) unrelated to Kerberos.
> - picks up the HDFS/HBASE delegation tokens.
> 2. Fix the use of alternative authentication methods - delegation tokens and Kerberos ticket cache.



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