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From "Thomas Marquardt (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-14935) Azure: POSIX permissions are taking effect in access() method even when authorization is enabled
Date Thu, 12 Oct 2017 21:50:00 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-14935?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16202682#comment-16202682
] 

Thomas Marquardt commented on HADOOP-14935:
-------------------------------------------

Steve, I read the description for HADOOP-14845 and it doesn't make sense to me.  Not sure
if you can clarify what it is about.  Regardless...

Before this JIRA and the attached patch, we had two properties ("fs.azure.authorization" and
"fs.azure.secure.mode") which had to be set to true in order to enable authorization.  This
JIRA proposes that we add a third property ("fs.azure.enable.authorization.getfilestatus").
 

We should not add a third property.  It would increase the likelihood of user errors that
enable applications to by-pass authorization. What we should do is comply with the HDFS Permissions
Guide, which currently states all operations require traversal access.  In the meantime, I
think we should remove "fs.azure.enable.authorization.getfilestatus" and enable authorization
for getFileStatus when authorization is enabled ("fs.azure.authorization" and "fs.azure.secure.mode"
are true) .

Until we have contract tests to validate implementations of the Hadoop permissions model,
I don't think we can rely on them for access control.


> Azure: POSIX permissions are taking effect in access() method even when authorization
is enabled
> ------------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-14935
>                 URL: https://issues.apache.org/jira/browse/HADOOP-14935
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: fs/azure
>    Affects Versions: 2.9.0
>            Reporter: Santhosh G Nayak
>            Assignee: Santhosh G Nayak
>         Attachments: HADOOP-14935-003.patch, HADOOP-14935-004.patch, HADOOP-14935.1.patch,
HADOOP-14935.2.patch
>
>
> FileSystem implementation class for azure i.e. {{NativeAzureFileSystem}} does not override
{{access(path,mode)}} method and uses the default implementation from the base class. This
base implementaion uses the POSIX permissions to check if the requested user has access to
given path or not even when authorization is enabled, which is incorrect.
> {{NativeAzureFileSystem.access()}} in authorization enabled mode should use the authorization
mechanism provided instead of relying on the POSIX permission ons. So the proposal is to override
{{FileSystem.access()}} method in {{NativeAzureFileSystem}} such that it honors the authorization
mechanism configured in authorization enabled mode and falls back to POSIX permissions otherwise.



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