[jira] [Created] (HADOOP-16095) Support impersonation for AuthenticationFilter

["Eric Yang (JIRA)" <ji...@apache.org>]

Eric Yang created HADOOP-16095:
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             Summary: 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


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 using Hadoop proxy user ACL.  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 wrapper.

h2. Http Request

A few possible options:

1. Using query parameter to pass doAs user:
{code}
POST /service?doAs=foobar
Authorization: [proxy user Kerberos token]
{code}

2. Use HTTP Header to pass doAs user:
{code}
POST /service
Authorization: [proxy user Kerberos token]
x-hadoop-doas: foobar
{code}

h2. 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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