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From "Colin Patrick McCabe (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-9758) Provide configuration option for FileSystem/FileContext symlink resolution
Date Wed, 02 Oct 2013 01:01:22 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-9758?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Colin Patrick McCabe updated HADOOP-9758:
-----------------------------------------

    Fix Version/s:     (was: 2.3.0)
                   2.1.2-beta

> Provide configuration option for FileSystem/FileContext symlink resolution
> --------------------------------------------------------------------------
>
>                 Key: HADOOP-9758
>                 URL: https://issues.apache.org/jira/browse/HADOOP-9758
>             Project: Hadoop Common
>          Issue Type: Improvement
>            Reporter: Andrew Wang
>            Assignee: Andrew Wang
>             Fix For: 2.1.2-beta
>
>         Attachments: hadoop-9758-4.patch, hadoop-9758-5.patch, hadoop-9758-6.patch, hdfs-4968-1.patch,
hdfs-4968-2.patch, hdfs-4968-3.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.
> This is also potentially useful for clients using FileContext, so let's add it there
too.



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