[jira] [Updated] (HADOOP-12468) Partial group resolution failure should not result in user lockout

["Wei-Chiu Chuang (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HADOOP-12468?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Wei-Chiu Chuang updated HADOOP-12468:
-------------------------------------
    Attachment: HADOOP-12468.007.patch

Thanks to [~yzhangal] for the valuable and detailed feedbacks!
I am attaching rev7, which is based on Yongjun's comments with a few more code style changes.

> Partial group resolution failure should not result in user lockout
> ------------------------------------------------------------------
>
>                 Key: HADOOP-12468
>                 URL: https://issues.apache.org/jira/browse/HADOOP-12468
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: security
>    Affects Versions: 2.6.1
>         Environment: Linux
>            Reporter: Wei-Chiu Chuang
>            Assignee: Wei-Chiu Chuang
>            Priority: Minor
>         Attachments: HADOOP-12468.001.patch, HADOOP-12468.002.patch, HADOOP-12468.003.patch, HADOOP-12468.004.patch, HADOOP-12468.005.patch, HADOOP-12468.006.patch, HADOOP-12468.007.patch
>
>
> If a Hadoop cluster is configured to use ShellBasedUnixGroupsMapping for user/group name mapping, occasionally some group names may become unresolvable (for example, using SSSD). 
> ShellBasedUnixGroupsMapping uses shell command "id -Gn" to retrieve the group name of a user; however, the existing logic assumes that if the exit code of the command is non-zero, the user has no group name at all. The shell command in Linux returns non-zero exit code if a group name is not resolvable. Unfortunately, it is possible that a user belongs to multiple groups, and any partial failure in group name resolution would denied the user's access.
> On the other hand, the JNI implementation (JniBasedUnixGroupsMapping) is more resilient. If any group name is unresolvable, it is simply ignored, and whatever are resolvable are returned.
> It is arguable that if the group name is not resolvable, the administrator should configure their directory/authentication service correctly, and Hadoop is in no position to handle it, but since the existing unit tests assume the output of JNI-based and shell-based implementation are the same, we should improve the shell-based group name resolution, and make it as resilient as the JNI-based one.



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