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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