Stephen Chu created HDFS-4671:
---------------------------------
Summary: DFSAdmin fetchImage should require superuser privilege
even when security is not enabled
Key: HDFS-4671
URL: https://issues.apache.org/jira/browse/HDFS-4671
Project: Hadoop HDFS
Issue Type: Bug
Affects Versions: 2.0.3-alpha
Reporter: Stephen Chu
When security is not enabled, non-superusers can fetch the fsimage. This is
problematic because the non-superusers can then process the fsimage for
contents the user should not have access to.
For example, schu is not a superuser and does not have access to
hdfs://user/hdfs/. However, schu can still fetch the fsimage and run the
OfflineImageViewer on the fsimage to examine the contents of hdfs://user/hdfs/.
{code}
[schu@hdfs-vanilla-1 images]$ hadoop fs -ls /user/hdfs
ls: Permission denied: user=schu, access=READ_EXECUTE,
inode="/user/hdfs":hdfs:supergroup:drwx------
[schu@hdfs-vanilla-1 images]$ hdfs dfsadmin -fetchImage ~/images/
13/04/08 12:45:20 INFO namenode.TransferFsImage: Opening connection to
http://hdfs-vanilla-1.ent.cloudera.com:50070/getimage?getimage=1&txid=latest
13/04/08 12:45:21 INFO namenode.TransferFsImage: Transfer took 0.91s at 91.61
KB/s
[schu@hdfs-vanilla-1 images]$ hdfs oiv -i ~/images/fsimage_0000000000000947148
-o ~/images/oiv.out
{code}
When kerberos authentication is enabled, superuser privilege is enforced:
{code}
[testuser@hdfs-secure-1 ~]$ hdfs dfsadmin -fetchImage ~/images/
13/04/08 12:48:23 INFO namenode.TransferFsImage: Opening connection to
http://hdfs-secure-1.ent.cloudera.com:50070/getimage?getimage=1&txid=latest
13/04/08 12:48:23 ERROR security.UserGroupInformation:
PriviledgedActionException as:testu...@ent.cloudera.com (auth:KERBEROS)
cause:org.apache.hadoop.hdfs.server.namenode.TransferFsImage$HttpGetFailedException:
Image transfer servlet at
http://hdfs-secure-1.ent.cloudera.com:50070/getimage?getimage=1&txid=latest
failed with status code 403
Response message:
Only Namenode, Secondary Namenode, and administrators may access this servlet
fetchImage: Image transfer servlet at
http://hdfs-secure-1.ent.cloudera.com:50070/getimage?getimage=1&txid=latest
failed with status code 403
Response message:
Only Namenode, Secondary Namenode, and administrators may access this servlet
[testuser@hdfs-secure-1 ~]$
{code}
We should still enforce checking privileges when kerberos authentication is
disabled.
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