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https://issues.apache.org/jira/browse/HDFS-12907?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16282559#comment-16282559
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Rushabh S Shah commented on HDFS-12907:
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bq. On the topic of webhdfs client-side encryption, could you talk a little
more about your usecase?
The use case is read/write to encrypted directory via WebhdfsfileSystem.
If we follow the current community implementation, we have to create a new user
to run datanode as (lets say {{dn}} separate from the user with which the
namenode runs: {{hdfs}}).
Also we need to whitelist {{dn}} user to be able to decrypt {{edek}}.
If someone gets access to {{dn}} user, they can easily decrypt all client's
edek.
> Allow read-only access to reserved raw for non-superusers
> ---------------------------------------------------------
>
> Key: HDFS-12907
> URL: https://issues.apache.org/jira/browse/HDFS-12907
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: namenode
> Affects Versions: 2.6.0
> Reporter: Daryn Sharp
> Assignee: Rushabh S Shah
> Attachments: HDFS-12907.patch
>
>
> HDFS-6509 added a special /.reserved/raw path prefix to access the raw file
> contents of EZ files. In the simplest sense it doesn't return the FE info in
> the {{LocatedBlocks}} so the dfs client doesn't try to decrypt the data.
> This facilitates allowing tools like distcp to copy raw bytes.
> Access to the raw hierarchy is restricted to superusers. This seems like an
> overly broad restriction designed to prevent non-admins from munging the EZ
> related xattrs. I believe we should relax the restriction to allow
> non-admins to perform read-only operations. Allowing non-superusers to
> easily read the raw bytes will be extremely useful for regular users, esp.
> for enabling webhdfs client-side encryption.
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