HIVE-29769: Authorize a stage-create on Iceberg REST API - #6641
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@saihemanth-cloudera, could you please take a look? I think you recently worked on this area and might be knowledgeable. |
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What changes were proposed in this pull request?
Authorize a CREATE TABLE request with stage-create enabled.
https://issues.apache.org/jira/browse/HIVE-29769
Why are the changes needed?
Stage Create is a feature to retrieve table locations and other information without persisting the table in the Hive Metastore. It is used when an external client performs a CTAS-like operation.
Our Iceberg REST relies on HMS for authz. For a normal table creation, HMS eventually verifies that the end user has the CREATE TABLE permission. For a stage create, the Iceberg REST API returns a response without calling pre-event listeners. It could be dangerous in the future since a stage create allows an end user to specify an arbitrary file path as a table location.
Currently, this is not a vulnerability because an end user uses their own credentials. If they have broader access than they should, they can access the files directly anyway.
This is very related to the vulnerability of Apache Polaris that was recently reported.
https://polaris.apache.org/community/security-advisories/cve-2026-42809/
This PR would validate the specified location using Apache Ranger or another authz plugin.
Does this PR introduce any user-facing change?
If a user runs stage-create with a specified location, it might fail if they don't have the proper permissions.
How was this patch tested?
I added unit and integration tests.