[jira] [Updated] (HDFS-13194) CachePool permissions incorrectly checked

["Jianfei Jiang (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HDFS-13194?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jianfei Jiang updated HDFS-13194:
---------------------------------
    Status: Patch Available  (was: Open)

Fix as [~linyiqun] mentioned and add testcase.

> CachePool permissions incorrectly checked
> -----------------------------------------
>
>                 Key: HDFS-13194
>                 URL: https://issues.apache.org/jira/browse/HDFS-13194
>             Project: Hadoop HDFS
>          Issue Type: Bug
>    Affects Versions: 3.0.0
>            Reporter: Yiqun Lin
>            Assignee: Jianfei Jiang
>            Priority: Major
>         Attachments: HDFS-13194.001.patch
>
>
> The permissions of CachePool incorrectly checked. The checking logic:
> {code:java}
>   public void checkPermission(CachePool pool, FsAction access)
>       throws AccessControlException {
>     FsPermission mode = pool.getMode();
>     if (isSuperUser()) {
>       return;
>     }
>     if (getUser().equals(pool.getOwnerName())
>         && mode.getUserAction().implies(access)) {
>       return;
>     }
>     if (isMemberOfGroup(pool.getGroupName())
>         && mode.getGroupAction().implies(access)) {
>       return;
>     }
>     // Following line seems incorrect,
>     // we should ensure current user is not belong the pool's owner or pool's group.
>     if (mode.getOtherAction().implies(access)) {
>       return;
>     }
>     throw new AccessControlException("Permission denied while accessing pool "
>         + pool.getPoolName() + ": user " + getUser() + " does not have "
>         + access.toString() + " permissions.");
>   }
> {code}
> For example one corner case, a cachepool (owner: test, group,test-group, permission mode:------rwx(007)), then one user which named "test" or whose group is "test-group" can both access this pool. But actually this is not allowed since permission for its owner or group is none.
>  The behavior of checking other user should be updated like this:
> {code:java}
>     if (!getUser().equals(pool.getOwnerName())
>         && !isMemberOfGroup(pool.getGroupName())
>         && mode.getOtherAction().implies(access)) {
>       return;
>     }
> {code}



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