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https://issues.apache.org/jira/browse/HADOOP-15725?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Oleksandr Shevchenko resolved HADOOP-15725.
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Resolution: Invalid
> FileSystem.deleteOnExit should check user permissions
> -----------------------------------------------------
>
> Key: HADOOP-15725
> URL: https://issues.apache.org/jira/browse/HADOOP-15725
> Project: Hadoop Common
> Issue Type: Bug
> Reporter: Oleksandr Shevchenko
> Priority: Major
> Labels: Security
> Attachments: deleteOnExitReproduce
>
>
> For now, we able to add any file to FileSystem deleteOnExit list. It leads to
> security problems. Some user (Intruder) can get file system instance which
> was created by another user (Owner) and mark any files to delete even if
> "Intruder" doesn't have any access to this files. Later when "Owner" invoke
> close method (or JVM is shut down since we have ShutdownHook which able to
> close all file systems) marked files will be deleted successfully since
> deleting was do behalf of "Owner" (or behalf of a user who ran a program).
> I attached the patch [^deleteOnExitReproduce] which reproduces this
> possibility and also I able to reproduce it on a cluster with both Local and
> Distributed file systems:
> {code:java}
> public class Main {
> public static void main(String[] args) throws Exception {
> final FileSystem fs;
> Configuration conf = new Configuration();
> conf.set("fs.default.name", "hdfs://node:9000");
> conf.set("fs.hdfs.impl",
> org.apache.hadoop.hdfs.DistributedFileSystem.class.getName()
> );
> fs = FileSystem.get(conf);
> System.out.println(fs);
> Path f = new Path("/user/root/testfile");
> System.out.println(f);
> UserGroupInformation hive = UserGroupInformation.createRemoteUser("hive");
> hive.doAs((PrivilegedExceptionAction<Boolean>) () -> fs.deleteOnExit(f));
> fs.close();
> }
> {code}
> Result:
> {noformat}
> root@node:/# hadoop fs -put testfile /user/root
> root@node:/# hadoop fs -chmod 700 /user/root/testfile
> root@node:/# hadoop fs -ls /user/root
> Found 1 items
> -rw------- 1 root supergroup 0 2018-09-06 18:07 /user/root/testfile
> root@node:/# java -jar testDeleteOther.jar
> log4j:WARN No appenders could be found for logger
> (org.apache.hadoop.conf.Configuration.deprecation).
> log4j:WARN Please initialize the log4j system properly.
> log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more
> info.
> DFS[DFSClient[clientName=DFSClient_NONMAPREDUCE_309539034_1, ugi=root
> (auth:SIMPLE)]]
> /user/root/testfile
> []
> root@node:/# hadoop fs -ls /user/root
> root@node:/#
> {noformat}
> We should add a check user permissions before mark a file to delete.
> Could someone evaluate this? And if no one objects I would like to start
> working on this.
> Thanks a lot for any comments.
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