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https://issues.apache.org/jira/browse/HADOOP-18972?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18028465#comment-18028465
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ASF GitHub Bot commented on HADOOP-18972:
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charlesconnell commented on PR #6272:
URL: https://github.com/apache/hadoop/pull/6272#issuecomment-3383408399
@steveloughran Updated!
> Bug in SaslPropertiesResolver allows mutation of internal state
> ---------------------------------------------------------------
>
> Key: HADOOP-18972
> URL: https://issues.apache.org/jira/browse/HADOOP-18972
> Project: Hadoop Common
> Issue Type: Bug
> Reporter: Charles Connell
> Priority: Minor
> Labels: pull-request-available
>
> When {{SaslDataTransferServer}} or {{SaslDataTranferClient}} want to get a
> SASL properties map to do a handshake, they call
> {{SaslPropertiesResolver#getServerProperties()}} or
> {{SaslPropertiesResolver#getClientProperties()}}, and they get back a
> {{Map<String, String>}}. Every call gets the same {{Map}} object back, and
> then the callers sometimes call
> [put()|https://github.com/apache/hadoop/blob/rel/release-3.3.6/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocol/datatransfer/sasl/SaslDataTransferServer.java#L385]
> on it. This means that future users of {{SaslPropertiesResolver}} get back
> the wrong information.
> I propose that {{SaslPropertiesResolver}} should pass a copy of its internal
> map, so that users can safety modify them.
> I discovered this problem in my company's testing environment as we began to
> enable {{dfs.data.transfer.protection}} on our DataNodes, while our NameNodes
> were using {{IngressPortBasedResolver}} to give out block tokens with
> different QOPs depending on the port used. Then our HDFS client applications
> became unable to read or write to HDFS because they could not find a QOP in
> common with the DataNodes during SASL handshake. With multiple threads
> executing SASL handshakes at the same time, the properties map used in
> {{SaslDataTransferServer}} in a DataNode could be clobbered during usage,
> since the same map was used by all threads. Also, future clients that do not
> have a QOP embedded in their block tokens would connect to a server with the
> wrong SASL properties map. I think that one or both of these issues explains
> the problem that I saw. I eliminated this unsafety and saw the problem go
> away.
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