[ 
https://issues.apache.org/jira/browse/HADOOP-19306?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17898001#comment-17898001
 ] 

ASF GitHub Bot commented on HADOOP-19306:
-----------------------------------------

jojochuang commented on code in PR #7140:
URL: https://github.com/apache/hadoop/pull/7140#discussion_r1840735896


##########
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/SaslMechanismFactory.java:
##########
@@ -0,0 +1,75 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.hadoop.security;
+
+import org.apache.hadoop.HadoopIllegalArgumentException;
+import org.apache.hadoop.classification.InterfaceAudience;
+import org.apache.hadoop.classification.InterfaceStability;
+import org.apache.hadoop.conf.Configuration;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import static 
org.apache.hadoop.fs.CommonConfigurationKeysPublic.HADOOP_SECURITY_SASL_MECHANISM_DEFAULT;
+import static 
org.apache.hadoop.fs.CommonConfigurationKeysPublic.HADOOP_SECURITY_SASL_MECHANISM_KEY;
+
+/**
+ * SASL related constants.
+ */
[email protected]({"HDFS", "MapReduce"})

Review Comment:
   should we open this open for YARN too?



##########
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/protocol/datatransfer/sasl/SaslDataTransferServer.java:
##########
@@ -224,21 +225,8 @@ static final class SaslServerCallbackHandler
      */
     SaslServerCallbackHandler(Configuration conf, PasswordFunction 
passwordFunction) {
       this.passwordFunction = passwordFunction;
-
-      final Class<?> clazz = conf.getClass(
-          
HdfsClientConfigKeys.DFS_DATA_TRANSFER_SASL_CUSTOMIZEDCALLBACKHANDLER_CLASS_KEY,
-          CustomizedCallbackHandler.DefaultHandler.class);
-      final Object callbackHandler;
-      try {
-        callbackHandler = clazz.newInstance();
-      } catch (Exception e) {
-        throw new IllegalStateException("Failed to create a new instance of " 
+ clazz, e);
-      }
-      if (callbackHandler instanceof CustomizedCallbackHandler) {
-        customizedCallbackHandler = (CustomizedCallbackHandler) 
callbackHandler;
-      } else {
-        customizedCallbackHandler = 
CustomizedCallbackHandler.delegate(callbackHandler);
-      }
+      this.customizedCallbackHandler = CustomizedCallbackHandler.get(
+          
HdfsClientConfigKeys.DFS_DATA_TRANSFER_SASL_CUSTOMIZEDCALLBACKHANDLER_CLASS_KEY,
 conf);

Review Comment:
   maybe it should use HADOOP_SECURITY_SASL_CUSTOMIZEDCALLBACKHANDLER_CLASS_KEY 
to be consistent? not sure.



##########
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/SaslMechanismFactory.java:
##########
@@ -0,0 +1,75 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.hadoop.security;
+
+import org.apache.hadoop.HadoopIllegalArgumentException;
+import org.apache.hadoop.classification.InterfaceAudience;
+import org.apache.hadoop.classification.InterfaceStability;
+import org.apache.hadoop.conf.Configuration;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import static 
org.apache.hadoop.fs.CommonConfigurationKeysPublic.HADOOP_SECURITY_SASL_MECHANISM_DEFAULT;
+import static 
org.apache.hadoop.fs.CommonConfigurationKeysPublic.HADOOP_SECURITY_SASL_MECHANISM_KEY;
+
+/**
+ * SASL related constants.
+ */
[email protected]({"HDFS", "MapReduce"})
[email protected]
+public final class SaslMechanismFactory {
+  static final Logger LOG = 
LoggerFactory.getLogger(SaslMechanismFactory.class);
+
+  private static final String SASL_MECHANISM_ENV = "HADOOP_SASL_MECHANISM";
+  private static final String SASL_MECHANISM;
+
+  static {
+    // env
+    final String envValue = System.getenv(SASL_MECHANISM_ENV);
+    LOG.debug("{} = {} (env)", SASL_MECHANISM_ENV, envValue);
+
+    // conf
+    final Configuration conf = new Configuration();

Review Comment:
   I am a little concerned about this one.
   If an application loads configuration from a custom path, 
SaslMechanismFactory initialized this way will load configurations from default 
path, and results in unexpected behavior to the user.
   
   And that is a potential security issue. I had some grief over similar 
problems before, see: 
[HADOOP-13638](https://issues.apache.org/jira/browse/HADOOP-13638)



##########
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/SaslConstants.java:
##########
@@ -1,45 +0,0 @@
-/*
- * Licensed to the Apache Software Foundation (ASF) under one
- * or more contributor license agreements.  See the NOTICE file
- * distributed with this work for additional information
- * regarding copyright ownership.  The ASF licenses this file
- * to you under the Apache License, Version 2.0 (the
- * "License"); you may not use this file except in compliance
- * with the License.  You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-package org.apache.hadoop.security;
-
-import org.apache.hadoop.classification.InterfaceAudience;
-import org.apache.hadoop.classification.InterfaceStability;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-
-/**
- * SASL related constants.
- */
[email protected]({"HDFS", "MapReduce"})
[email protected]
-public class SaslConstants {

Review Comment:
   this class is not available in any offcial Apache Hadoop releases, so it's 
okay to remove it.





> Support user defined auth Callback in SaslRpcServer
> ---------------------------------------------------
>
>                 Key: HADOOP-19306
>                 URL: https://issues.apache.org/jira/browse/HADOOP-19306
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: ipc, security
>            Reporter: Tsz-wo Sze
>            Assignee: Tsz-wo Sze
>            Priority: Major
>              Labels: pull-request-available
>
> Similar to HDFS-17576, SaslRpcServer should support CustomizedCallbackHandler.



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