Andrew Wang created HDFS-4968:
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Summary: 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
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 that in the new Hiveserver2 security model, all Hive queries
run as the Hive user. Users can also use Hive to query data in their homedirs,
provided it's 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/}}
# Hiveserver2 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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