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Date: Wed, 11 Jun 2014 17:57:02 +0000 (UTC)
From: "Brandon Li (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
Message-ID: <JIRA.12715611.1400622923202.110627.1402509422291@arcas>
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Subject: [jira] [Updated] (HDFS-6439) NFS should not reject NFS requests to
 the NULL procedure whether port monitoring is enabled or not
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     [ https://issues.apache.org/jira/browse/HDFS-6439?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Brandon Li updated HDFS-6439:
-----------------------------

    Attachment: HDFS-6439.004.patch

Uploaded a new patch to fix the unit test failure.

> NFS should not reject NFS requests to the NULL procedure whether port monitoring is enabled or not
> --------------------------------------------------------------------------------------------------
>
>                 Key: HDFS-6439
>                 URL: https://issues.apache.org/jira/browse/HDFS-6439
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: nfs
>    Affects Versions: 2.4.0
>            Reporter: Brandon Li
>            Assignee: Aaron T. Myers
>         Attachments: HDFS-6439.003.patch, HDFS-6439.004.patch, HDFS-6439.patch, HDFS-6439.patch, linux-nfs-disallow-request-from-nonsecure-port.pcapng, mount-nfs-requests.pcapng
>
>
> As discussed in HDFS-6406, this JIRA is to track the follow update:
> 1. Port monitoring is the feature name with traditional NFS server and we may want to make the config property (along with related variable allowInsecurePorts) something as dfs.nfs.port.monitoring. 
> 2 . According to RFC2623 (http://www.rfc-editor.org/rfc/rfc2623.txt):
> {quote}    Whether port monitoring is enabled or not, NFS servers SHOULD NOT reject NFS requests to the NULL procedure (procedure number 0). See subsection 2.3.1, "NULL procedure" for a complete explanation. {quote}
> I do notice that NFS clients (most time) send mount NULL and nfs NULL from non-privileged port. If we deny NULL call in mountd or nfs server, the client can't mount the export even as user root.
> 3. it would be nice to have the user guide updated for the port monitoring feature.


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