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https://issues.apache.org/jira/browse/HDFS-14434?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16820344#comment-16820344
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Eric Yang commented on HDFS-14434:
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[~kihwal] How does impersonation take place for service user to access HDFS on
behave of end user without doAs?
> webhdfs that connect secure hdfs should not use user.name parameter
> -------------------------------------------------------------------
>
> Key: HDFS-14434
> URL: https://issues.apache.org/jira/browse/HDFS-14434
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: webhdfs
> Affects Versions: 3.1.2
> Reporter: KWON BYUNGCHANG
> Priority: Minor
> Attachments: HDFS-14434.001.patch
>
>
> I have two secure hadoop cluster. Both cluster use cross-realm
> authentication.
> [use...@a.com|mailto:use...@a.com] can access to HDFS of B.COM realm
> by the way, hadoop username of use...@a.com in B.COM realm is
> cross_realm_a_com_user_a.
> hdfs dfs command of use...@a.com using B.COM webhdfs failed.
> root cause is webhdfs that connect secure hdfs use user.name parameter.
> according to webhdfs spec, insecure webhdfs use user.name, secure webhdfs
> use SPNEGO for authentication.
> I think webhdfs that connect secure hdfs should not use user.name parameter.
> I will attach patch.
> below is error log
>
> {noformat}
> $ hdfs dfs -ls webhdfs://b.com:50070/
> ls: Usernames not matched: name=user_a != expected=cross_realm_a_com_user_a
>
> # user.name in cross realm webhdfs
> $ curl -u : --negotiate
> 'http://b.com:50070/webhdfs/v1/?op=GETDELEGATIONTOKEN&user.name=user_a'
> {"RemoteException":{"exception":"SecurityException","javaClassName":"java.lang.SecurityException","message":"Failed
> to obtain user group information: java.io.IOException: Usernames not
> matched: name=user_a != expected=cross_realm_a_com_user_a"}}
> # USE SPNEGO
> $ curl -u : --negotiate 'http://b.com:50070/webhdfs/v1/?op=GETDELEGATIONTOKEN'
> {"Token"{"urlString":"XgA....."}}
>
> {noformat}
>
>
>
>
>
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