Raghavender Rao Guruvannagari created HDFS-13205:
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Summary: Incorrect path is passed to checkPermission during
authorization of file under a snapshot (specifically under a subdir) after
original subdir is deleted
Key: HDFS-13205
URL: https://issues.apache.org/jira/browse/HDFS-13205
Project: Hadoop HDFS
Issue Type: Bug
Components: hdfs
Affects Versions: 2.7.4
Reporter: Raghavender Rao Guruvannagari
Steps to reproduce the issue.
+As 'hdfs' superuser+
-- Create a folder (/hdptest/test) with 700 permissions and (
/hdptest/test/mydir) with 755.
--HDFS Ranger policy is defined with RWX for user "test" on /hdptest/test/
recursively.
--Allow snapshot on the directory /hdptest/test/mydir:
{code:java}
#su - test
[test@node1 ~]$ hdfs dfs -ls /hdptest/test/mydir
[test@node1 ~]$ hdfs dfs -mkdir /hdptest/test/mydir/test
[test@node1 ~]$ hdfs dfs -put /etc/passwd /hdptest/test/mydir/test
[test@node1 ~]$ hdfs lsSnapshottableDir
drwxr-xr-x 0 test hdfs 0 2018-01-25 14:22 1 65536 /hdptest/test/mydir
{code}
-->Create Snapshot :
{code:java}
[test@node1 ~]$ hdfs dfs -createSnapshot /hdptest/test/mydir
Created snapshot /hdptest/test/mydir/.snapshot/s20180125-135430.953
{code}
-->Verifying that snapshot directory has the current files from directory and
verify the file is accessible .snapshot path:
{code:java}
[test@node1 ~]$ hdfs dfs -ls -R
/hdptest/test/mydir/.snapshot/s20180125-135430.953
drwxr-xr-x - test hdfs 0 2018-01-25 13:53
/hdptest/test/mydir/.snapshot/s20180125-135430.953/test
-rw-r--r-- 3 test hdfs 3227 2018-01-25 13:53
/hdptest/test/mydir/.snapshot/s20180125-135430.953/test/passwd
[test@node1 ~]$ hdfs dfs -cat
/hdptest/test/mydir/.snapshot/s20180125-135430.953/test/passwd | tail
livytest:x:1015:496::/home/livytest:/bin/bash
ehdpzepp:x:1016:496::/home/ehdpzepp:/bin/bash
zepptest:x:1017:496::/home/zepptest:/bin/bash
{code}
-->Remove the file from main directory and verified that file is still
accessible:
{code:java}
[test@node1 ~]$ hdfs dfs -rm /hdptest/test/mydir/test/passwd
18/01/25 13:55:06 INFO fs.TrashPolicyDefault: Moved:
'hdfs://rangerSME/hdptest/test/mydir/test/passwd' to trash at:
hdfs://rangerSME/user/test/.Trash/Current/hdptest/test/mydir/test/passwd
[test@node1 ~]$ hdfs dfs -cat
/hdptest/test/mydir/.snapshot/s20180125-135430.953/test/passwd | tail
livytest:x:1015:496::/home/livytest:/bin/bash
{code}
-->Remove the parent directory of the file which was deleted, now accessing the
same file under .snapshot dir fails with permission denied error
{code:java}
[test@node1 ~]$ hdfs dfs -rm -r /hdptest/test/mydir/test
18/01/25 13:55:25 INFO fs.TrashPolicyDefault: Moved:
'hdfs://rangerSME/hdptest/test/mydir/test' to trash at:
hdfs://rangerSME/user/test/.Trash/Current/hdptest/test/mydir/test1516888525269
[test@node1 ~]$ hdfs dfs -cat
/hdptest/test/mydir/.snapshot/s20180125-135430.953/test/passwd | tail
cat: Permission denied: user=test, access=EXECUTE,
inode="/hdptest/test/mydir/.snapshot/s20180125-135430.953/test/passwd":hdfs:hdfs:drwxr-x---
{code}
Ranger policies are not honored in this case for .snapshot directories/files
after main directory is deleted under snapshotable directory.
Workaround is to provide execute permission at HDFS level for the parent folder
{code:java}
#su - hdfs
#hdfs dfs -chmod 701 /hdptest/test
{code}
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