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https://issues.apache.org/jira/browse/KNOX-3048?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Work on KNOX-3048 started by Sandeep More.
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> Surrogate proxy user configuration for user groups
> --------------------------------------------------
>
> Key: KNOX-3048
> URL: https://issues.apache.org/jira/browse/KNOX-3048
> Project: Apache Knox
> Issue Type: Improvement
> Components: Server
> Affects Versions: 2.0.0
> Reporter: Philip Zampino
> Assignee: Sandeep More
> Priority: Major
> Fix For: 2.1.0
>
>
> It would be useful to allow the ability to configure proxy user impersonation
> configuration for all those users belonging to a particular group.
> For example, topologies currently require such configuration for every "end
> user" who is designated as a Knox admin to perform impersonation for the
> token API. This potentially results in too much config in a topology, and
> represents an administration burden on Knox admins.
> The proposal is to add support for groups, for which the surrogate proxy user
> config could be defined (once) in the topology, for which authenticated users
> would be validated against their membership in the configured group before
> being permitted to perform impersonation.
> This can be supported by adding a qualifying prefix (e.g., GRP__) to a group
> name, and the ACL will be created.
> *Example provider configuration with "surrogate" admin group proxyuser
> configuration*
> {code:java}
> <provider>
> <role>identity-assertion</role>
> <name>Default</name>
> <enabled>true</enabled>
> <param>
> <name>hadoop.proxyuser.impersonation.enabled</name>
> <value>true</value>
> </param>
> <param>
> <name>hadoop.proxyuser.GRP__admin.users</name>
> <value>*</value>
> </param>
> <param>
> <name>hadoop.proxyuser.GRP__admin.groups</name>
> <value>*</value>
> </param>
> <param>
> <name>hadoop.proxyuser.GRP__admin.hosts</name>
> <value>NONE</value>
> </param>
> </provider> {code}
> With this type of configuration, an extension of
> _org.apache.hadoop.security.authorize.DefaultImpersonationProvider_
> can be implemented, overriding the following method
> _public void authorize(UserGroupInformation user, String remoteAddress)
> throws AuthorizationException_
> to catch the AuthorizationException resulting from the lack of any
> user-specific ACL, and check for ACLs associated with the impersonating
> user's groups.
>
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