[jira] [Commented] (HADOOP-11321) copyToLocal cannot save a file to an SMB share unless the user has Full Control permissions.

["Chris Nauroth (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HADOOP-11321?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14218764#comment-14218764 ] 

Chris Nauroth commented on HADOOP-11321:
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The access denied error occurs in libwinutils.c, in {{ChangeFileModeByMask}}, when it calls the Windows API {{SetFileSecurity}} with a security descriptor containing the new discretionary access control list.  The SMB share denies the {{WRITE_DAC}} right.  More details on those APIs are here:

http://msdn.microsoft.com/en-us/library/windows/desktop/aa379577(v=vs.85).aspx

http://msdn.microsoft.com/en-us/library/windows/desktop/aa374892(v=vs.85).aspx


> copyToLocal cannot save a file to an SMB share unless the user has Full Control permissions.
> --------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-11321
>                 URL: https://issues.apache.org/jira/browse/HADOOP-11321
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: fs
>    Affects Versions: 2.6.0
>            Reporter: Chris Nauroth
>            Assignee: Chris Nauroth
>
> In Hadoop 2, it is impossible to use {{copyToLocal}} to copy a file from HDFS to a destination on an SMB share.  This is because in Hadoop 2, the {{copyToLocal}} maps to 2 underlying {{RawLocalFileSystem}} operations: {{create}} and {{setPermission}}.  On an SMB share, the user may be authorized for the {{create}} but denied for the {{setPermission}}.  Windows denies the {{WRITE_DAC}} right required by {{setPermission}} unless the user has Full Control permissions.  Granting Full Control isn't feasible for most deployments, because it's insecure.  This is a regression from Hadoop 1, where {{copyToLocal}} only did a {{create}} and didn't do a separate {{setPermission}}.



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