[jira] [Commented] (HADOOP-12953) New API for libhdfs to get FileSystem object as a proxy user

["Hadoop QA (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HADOOP-12953?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15207216#comment-15207216 ] 

Hadoop QA commented on HADOOP-12953:
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| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | {color:blue} reexec {color} | {color:blue} 0m 0s {color} | {color:blue} Docker mode activated. {color} |
| {color:red}-1{color} | {color:red} patch {color} | {color:red} 0m 13s {color} | {color:red} HADOOP-12953 does not apply to trunk. Rebase required? Wrong Branch? See https://wiki.apache.org/hadoop/HowToContribute for help. {color} |
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|| Subsystem || Report/Notes ||
| JIRA Patch URL | https://issues.apache.org/jira/secure/attachment/12794826/HADOOP-12953.001.patch |
| JIRA Issue | HADOOP-12953 |
| Console output | https://builds.apache.org/job/PreCommit-HADOOP-Build/8895/console |
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> New API for libhdfs to get FileSystem object as a proxy user
> ------------------------------------------------------------
>
>                 Key: HADOOP-12953
>                 URL: https://issues.apache.org/jira/browse/HADOOP-12953
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: fs
>            Reporter: Uday Kale
>            Assignee: Uday Kale
>         Attachments: HADOOP-12953.001.patch
>
>
> Secure impersonation in HDFS needs users to create proxy users and work with those. In libhdfs, the hdfsBuilder accepts a userName but calls FileSytem.get() or FileSystem.newInstance() with the user name to connect as. But, both these interfaces use getBestUGI() to get the UGI for the given user. This is not necessarily true for all services whose end-users would not access HDFS directly, but go via the service to first get authenticated with LDAP, then the service owner can impersonate the end-user to eventually provide the underlying data.
> For such services that authenticate end-users via LDAP, the end users are not authenticated by Kerberos, so their authentication details wont be in the Kerberos ticket cache. HADOOP_PROXY_USER is not a thread-safe way to get this either. 
> Hence the need for the new API for libhdfs to get the FileSystem object as a proxy user using the 'secure impersonation' recommendations. This approach is  secure since HDFS authenticates the service owner and then validates the right for the service owner to impersonate the given user as allowed by hadoop.proxyusers.* parameters of HDFS config.



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