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https://issues.apache.org/jira/browse/HDFS-4968?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andrew Wang updated HDFS-4968:
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Attachment: hdfs-4968-1.patch
Here's a patch that adds a new config key, fs.symlinks.resolve, to common. It
disables resolution in both FSLinkResolver (FileContext) and in
FileSystemLinkResolver(FileSystem).
Included test is for HDFS since the local filesystems automatically resolve
symlinks.
> Provide configuration option for FileSystem symlink resolution
> --------------------------------------------------------------
>
> Key: HDFS-4968
> URL: https://issues.apache.org/jira/browse/HDFS-4968
> Project: Hadoop HDFS
> Issue Type: Improvement
> Affects Versions: 3.0.0, 2.2.0
> Reporter: Andrew Wang
> Assignee: Andrew Wang
> Attachments: hdfs-4968-1.patch
>
>
> With FileSystem symlink support incoming in HADOOP-8040, some clients will
> wish to not transparently resolve symlinks. This is somewhat similar to
> O_NOFOLLOW in open(2).
> Rationale for is for a security model where a user can invoke a third-party
> service running as a service user to operate on the user's data. For
> instance, users might want to use Hive to query data in their homedirs, where
> Hive runs as the Hive user and the data is readable by the Hive user. This
> leads to a security issue with symlinks:
> # User Mallory invokes Hive to process data files in {{/user/mallory/hive/}}
> # Hive checks permissions on the files in {{/user/mallory/hive/}} and allows
> the query to proceed.
> # RACE: Mallory replaces the files in {{/user/mallory/hive}} with symlinks
> that point to user Ann's Hive files in {{/user/ann/hive}}. These files aren't
> readable by Mallory, but she can create whatever symlinks she wants in her
> own scratch directory.
> # Hive's MR jobs happily resolve the symlinks and accesses Ann's private data.
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