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https://issues.apache.org/jira/browse/KNOX-2831?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Work on KNOX-2831 started by Sandor Molnar.
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> Knox token impersonation in multiple topologies
> -----------------------------------------------
>
> Key: KNOX-2831
> URL: https://issues.apache.org/jira/browse/KNOX-2831
> Project: Apache Knox
> Issue Type: Task
> Components: Server
> Affects Versions: 2.0.0
> Reporter: Sandor Molnar
> Assignee: Sandor Molnar
> Priority: Critical
> Fix For: 2.0.0
>
>
> With KNOX-2714, users can create tokens on behalf of others by configuring
> [Knox Token
> Impersonation|https://knox.apache.org/books/knox-2-0-0/user-guide.html#Token+impersonation]
> in the {{KNOXTOKEN}} service.
> However, when there are multiple topologies with the {{KNOXTOKEN}} service
> and they have different proxyuser configurations the feature breaks as
> follows:
> - {{topology1}} enables {{user1}} to create tokens for {{targetUser1}}
> - {{topology2}} enables {{user2} to create tokens for {{targetUser2}}
> Let's see this flow:
> # get a token for {{targetUser1}} by {{user1}} - this succeeds
> # get a token for {{targetUser2}} by {{user2}} - this succeeds
> # get another token for {{targetUser1}} by {{user1}} - this fails
> The reason is that Knox's {{KNOXTOKEN}} service uses Hadoop's
> {{ProxyUsers.refreshSuperUserGroupsConfiguration(Configuration conf, String
> proxyUserPrefix)}} which the 2nd call overrides in the {{init}} method of
> that servlet. So the 3rd call will fail because the previous configuration on
> that topology is lost.
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