[jira] [Created] (HADOOP-15997) KMS client uses wrong UGI after HADOOP-14445

["Wei-Chiu Chuang (JIRA)" <ji...@apache.org>]

Wei-Chiu Chuang created HADOOP-15997:
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             Summary: KMS client uses wrong UGI after HADOOP-14445
                 Key: HADOOP-15997
                 URL: https://issues.apache.org/jira/browse/HADOOP-15997
             Project: Hadoop Common
          Issue Type: Bug
         Environment: Hadoop 3.0.x, Kerberized, HDFS at-rest encryption, multiple KMS

            Reporter: Wei-Chiu Chuang


After HADOOP-14445, KMS client always authenticates itself using the credentials from login user, rather than current user.
{noformat}
2018-12-07 15:58:30,663 DEBUG [main] org.apache.hadoop.crypto.key.kms.KMSClientProvider: Using loginUser when Kerberos is enabled but the actual user does not have either KMS Delegation Token or Kerberos Credentials
{noformat}
The log message is printed because {{KMSClientProvider#containsKmsDt()}} is null when it definitely has the kms delegation token.

In fact, {{KMSClientProvider#containsKmsDt()}} should select delegation token using {{clientTokenProvider.selectDelegationToken(creds)}} rather than checking if its dtService is in the user credentials.

This is done correctly in {{KMSClientProvider#createAuthenticatedURL}} though.

We found this bug when it broke Cloudera's Backup and Disaster Recovery tool.

 

[~daryn] [~xiaochen] mind taking a look? HADOOP-14445 is a huge patch but it is almost perfect except for this bug.



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