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https://issues.apache.org/jira/browse/HADOOP-16095?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Eric Yang reopened HADOOP-16095:
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Found an issue with distcp backward compatibility, opened HADOOP-16356 to track
required changes.
> Support impersonation for AuthenticationFilter
> ----------------------------------------------
>
> Key: HADOOP-16095
> URL: https://issues.apache.org/jira/browse/HADOOP-16095
> Project: Hadoop Common
> Issue Type: New Feature
> Components: security
> Reporter: Eric Yang
> Assignee: Eric Yang
> Priority: Major
> Fix For: 3.3.0
>
> Attachments: HADOOP-16095.004.patch
>
>
> External services or YARN service may need to call into WebHDFS or YARN REST
> API on behave of the user using web protocols. It would be good to support
> impersonation mechanism in AuthenticationFilter or similar extensions. The
> general design is similar to UserGroupInformation.doAs in RPC layer.
> The calling service credential is verified as a proxy user coming from a
> trusted host verifying Hadoop proxy user ACL on the server side. If proxy
> user ACL allows proxy user to become doAs user. HttpRequest object will
> report REMOTE_USER as doAs user. This feature enables web application logic
> to be written with minimal changes to call Hadoop API with
> UserGroupInformation.doAs() wrapper.
> h2. HTTP Request
> A few possible options:
> 1. Using query parameter to pass doAs user:
> {code:java}
> POST /service?doAs=foobar
> Authorization: [proxy user Kerberos token]
> {code}
> 2. Use HTTP Header to pass doAs user:
> {code:java}
> POST /service
> Authorization: [proxy user Kerberos token]
> x-hadoop-doas: foobar
> {code}
> h2. HTTP Response
> 403 - Forbidden (Including impersonation is not allowed)
> h2. Proxy User ACL requirement
> Proxy user kerberos token maps to a service principal, such as
> yarn/host1.example.com. The host part of the credential and HTTP request
> origin are both validated with *hadoop.proxyuser.yarn.hosts* ACL. doAs user
> group membership or identity is checked with either
> *hadoop.proxyuser.yarn.groups* or *hadoop.proxyuser.yarn.users*. This governs
> the caller is coming from authorized host and belong to authorized group.
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