[jira] [Created] (HADOOP-13988) KMSClientProvider does not work with WebHDFS and Apache Knox w/ProxyUser

["Greg Senia (JIRA)" <ji...@apache.org>]

Greg Senia created HADOOP-13988:
-----------------------------------

             Summary: KMSClientProvider does not work with WebHDFS and Apache Knox w/ProxyUser
                 Key: HADOOP-13988
                 URL: https://issues.apache.org/jira/browse/HADOOP-13988
             Project: Hadoop Common
          Issue Type: Bug
          Components: common, kms
    Affects Versions: 2.7.3
         Environment: HDP 2.5.3.0 

WebHDFSUser --> Knox --> HA NameNodes(WebHDFS) --> DataNodes
            Reporter: Greg Senia


After upgrading to HDP 2.5.3.0 noticed that all of the KMSClientProvider issues have not been resolved. We put a test build together and applied HADOOP-13558 and HADOOP-13749 these two fixes did still not solve the issue with requests coming from WebHDFS through to Knox to a TDE zone.

So we added some debug to our build and determined effectively what is happening here is a double proxy situation which does not seem to work. So we propose the following fix in getActualUgi Method:

     }
     // Use current user by default
     UserGroupInformation actualUgi = currentUgi;
     if (currentUgi.getRealUser() != null) {
       // Use real user for proxy user
       if (LOG.isDebugEnabled()) {
	   LOG.debug("using RealUser for proxyUser);
	}
       actualUgi = currentUgi.getRealUser();
       if (getDoAsUser() != null) {
      	  if (LOG.isDebugEnabled()) {
		LOG.debug("doAsUser exists");
		LOG.debug("currentUGI realUser shortName: {}", currentUgi.getRealUser().getShortUserName());
		LOG.debug("processUGI loginUser shortName: {}", UserGroupInformation.getLoginUser().getShortUserName());
          }
    	  if (currentUgi.getRealUser().getShortUserName() != UserGroupInformation.getLoginUser().getShortUserName()) {
    		  if (LOG.isDebugEnabled()) {
		  	LOG.debug("currentUGI.realUser does not match UGI.processUser);
		  }
		  actualUgi = UserGroupInformation.getLoginUser();
		  if (LOG.isDebugEnabled()) {
	    	  	LOG.debug("LoginUser for Proxy: {}", actualUgi.getLoginUser());
		  }
     	  }
       }
	
     } else if (!currentUgiContainsKmsDt() &&
         !currentUgi.hasKerberosCredentials()) {
       // Use login user for user that does not have either
       // Kerberos credential or KMS delegation token for KMS operations
       if (LOG.isDebugEnabled()) {
	   LOG.debug("using loginUser no KMS Delegation Token no Kerberos Credentials");
	}
       actualUgi = currentUgi.getLoginUser();
     }
     return actualUgi;
   }



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