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Posted to common-issues@hadoop.apache.org by "Bharat Viswanadham (JIRA)" <ji...@apache.org> on 2018/04/02 21:19:00 UTC
[jira] [Comment Edited] (HADOOP-12953) New API for libhdfs to get
FileSystem object as a proxy user
[ https://issues.apache.org/jira/browse/HADOOP-12953?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16423154#comment-16423154 ]
Bharat Viswanadham edited comment on HADOOP-12953 at 4/2/18 9:18 PM:
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[~udayk]
Thanks for the patch.
The patch needs to be rebased to latest trunk and also need to fix checkstyle issues most of them are related to line length.
Patch LGTM.
Few more changes can be done like we can add a newmethod hdfsConnectAsProxyUserNewInstance similar to hdfsConnectAsUserNewInstance.
was (Author: bharatviswa):
[~udayk]
Thanks for the patch.
The patch needs to be rebased to latest trunk.
Patch LGTM.
Few more changes can be done like we can add a newmethod hdfsConnectAsProxyUserNewInstance similar to hdfsConnectAsUserNewInstance.
> 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
> Affects Versions: 2.7.2
> Reporter: Uday Kale
> Assignee: Uday Kale
> Priority: Major
> Attachments: HADOOP-12953.001.patch, HADOOP-12953.002.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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