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From "Sho Shimauchi (JIRA)" <j...@apache.org>
Subject [jira] [Created] (MAPREDUCE-4329) security.task.umbilical.protocol.acl should not be configurable
Date Fri, 08 Jun 2012 10:57:23 GMT
Sho Shimauchi created MAPREDUCE-4329:
----------------------------------------

             Summary: security.task.umbilical.protocol.acl should not be configurable
                 Key: MAPREDUCE-4329
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4329
             Project: Hadoop Map/Reduce
          Issue Type: Bug
          Components: security
    Affects Versions: 1.0.3
            Reporter: Sho Shimauchi


On running MapReduce job, username is changed to jobid and the job fails.
Exception is as follows:

{code}
2012-06-08 19:39:26,555 WARN org.apache.hadoop.security.ShellBasedUnixGroupsMapping: got exception
trying to get groups for user job_201206081934_0002
org.apache.hadoop.util.Shell$ExitCodeException: id: job_201206081934_0002: no such user

        at org.apache.hadoop.util.Shell.runCommand(Shell.java:255)
        at org.apache.hadoop.util.Shell.run(Shell.java:182)
        at org.apache.hadoop.util.Shell$ShellCommandExecutor.execute(Shell.java:375)
        at org.apache.hadoop.util.Shell.execCommand(Shell.java:461)
        at org.apache.hadoop.util.Shell.execCommand(Shell.java:444)
        at org.apache.hadoop.security.ShellBasedUnixGroupsMapping.getUnixGroups(ShellBasedUnixGroupsMapping.java:68)
        at org.apache.hadoop.security.ShellBasedUnixGroupsMapping.getGroups(ShellBasedUnixGroupsMapping.java:45)
        at org.apache.hadoop.security.Groups.getGroups(Groups.java:79)
        at org.apache.hadoop.security.UserGroupInformation.getGroupNames(UserGroupInformation.java:1026)
        at org.apache.hadoop.security.authorize.AccessControlList.isUserAllowed(AccessControlList.java:141)
        at org.apache.hadoop.security.authorize.ServiceAuthorizationManager.authorize(ServiceAuthorizationManager.java:99)
        at org.apache.hadoop.ipc.Server.authorize(Server.java:1659)
        at org.apache.hadoop.ipc.Server$Connection.authorizeConnection(Server.java:1320)
        at org.apache.hadoop.ipc.Server$Connection.processOneRpc(Server.java:1286)
        at org.apache.hadoop.ipc.Server$Connection.readAndProcess(Server.java:1182)
        at org.apache.hadoop.ipc.Server$Listener.doRead(Server.java:537)
        at org.apache.hadoop.ipc.Server$Listener$Reader.run(Server.java:344)
        at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
        at java.lang.Thread.run(Thread.java:680)
{code}

This issue can be reproduced by following steps:

1. set hadoop.security.authorization = true in core-site.xml

{code}
  <property>
    <name>hadoop.security.authorization</name>
    <value>true</value>
  </property>
{code}

2. set any value except for '*' to security.task.umbilical.protocol.acl in hadoop-policy.xml

{code}

  <property>
    <name>security.task.umbilical.protocol.acl</name>
    <value>sho sho</value>
    <description>ACL for TaskUmbilicalProtocol, used by the map and reduce 
    tasks to communicate with the parent tasktracker. 
    The ACL is a comma-separated list of user and group names. The user and 
    group list is separated by a blank. For e.g. "alice,bob users,wheel". 
    A special value of "*" means all users are allowed.</description>
  </property>
{code}

3. run any mapreduce job.


h4. Code Analysis

./src/mapred/org/apache/hadoop/mapred/Child.java:102-118

{code}
    UserGroupInformation taskOwner 
     = UserGroupInformation.createRemoteUser(firstTaskid.getJobID().toString());
    taskOwner.addToken(jt);
    
    // Set the credentials
    defaultConf.setCredentials(credentials);
    
    final TaskUmbilicalProtocol umbilical = 
      taskOwner.doAs(new PrivilegedExceptionAction<TaskUmbilicalProtocol>() {
        @Override
        public TaskUmbilicalProtocol run() throws Exception {
          return (TaskUmbilicalProtocol)RPC.getProxy(TaskUmbilicalProtocol.class,
              TaskUmbilicalProtocol.versionID,
              address,
              defaultConf);
        }
    });
{code}


This code indicates that TaskUmbilicalProtocol uses jobid as username.
This code came from MAPREDUCE-1457. 
https://issues.apache.org/jira/browse/MAPREDUCE-1457

Devaraj said as follows in the JIRA:

{quote}
2) In Child.java, the task authenticates to the TaskTracker using the jobtoken. The username
in the jobtoken is jobId. The doAs block done using taskOwner is required so that the username
mentioned in the token and the one doing the operation matches.
{quote}

We can't change security.task.umbilical.protocol.acl and should always be '*' .
TaskUmbilicalProtocol should be removed from MapReducePolicyProvider to disable security.task.umbilical.protocol.acl.



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