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https://issues.apache.org/jira/browse/HADOOP-11337?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andrew Wang reassigned HADOOP-11337:
------------------------------------
Assignee: Dian Fu
> KeyAuthorizationKeyProvider#getMetadata should be atomic
> --------------------------------------------------------
>
> Key: HADOOP-11337
> URL: https://issues.apache.org/jira/browse/HADOOP-11337
> Project: Hadoop Common
> Issue Type: Bug
> Reporter: Dian Fu
> Assignee: Dian Fu
> Attachments: HADOOP-11337.patch
>
>
> In {{KeyAuthorizationKeyProvider#getMetadata}}, if firstly call
> {{KeyAuthorizationKeyProvider#doAccessCheck}} to check if client has the
> permission to do this operation. However, if the metadata is null when
> {{KeyAuthorizationKeyProvider#doAccessCheck}} is called and becomes not null
> after {{KeyAuthorizationKeyProvider#doAccessCheck}} called, key based ACL
> check will be skipped. The {{getMetadata}} operation should be atomic.
> {code}
> public Metadata getMetadata(String name) throws IOException {
> doAccessCheck(name, KeyOpType.READ);
> return provider.getMetadata(name);
> }
> private void doAccessCheck(String keyName, KeyOpType opType) throws
> IOException {
> Metadata metadata = provider.getMetadata(keyName);
> if (metadata != null) {
> String aclName = metadata.getAttributes().get(KEY_ACL_NAME);
> checkAccess((aclName == null) ? keyName : aclName, getUser(), opType);
> }
> }
> {code}
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