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https://issues.apache.org/jira/browse/HDFS-6439?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Brandon Li updated HDFS-6439:
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Attachment: linux-nfs-disallow-request-from-nonsecure-port.pcapng
By default Linux NFS server denies request from nonsecure port. I've collected
the network trace while I tried to mount a Linux export from a MacOS NFS
client. Since MacOS NFS client uses nonsecure port by default, the mount
request failed with error "Operation not permitted".
I've uploaded the trace file
linux-nfs-disallow-request-from-nonsecure-port.pcapng. From wiresharek(filter
"rpc"), we can see the NFS GETATTR request failed with NFS3ERR_PERM.
To have the same behavior, we can add one more check in
RpcProgramNfs3#checkAccessPrivilege: if request is from non-secureport and port
monitoring is enabled, we return false. This change requires
ChannelHandlerContext to be passed from handleInternal() to each request
handler such as read()/write()/getattr()....
> 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.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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