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[Ghanshyam Mann <gmann@xxxxxxxxxxxxxxxxx>]

Public bug reported:

server topology index policy is default to admin_or_owner[1] but API is
allowed for everyone.

We can see the test trying with other project context can access the API
- https://review.opendev.org/#/c/717524/

This is because API does not pass the server project_id in policy target
- https://github.com/openstack/nova/blob/e4ac401d1a9d5fba24bc22141b362a5400d9d096/nova/api/openstack/compute/server_topology.py#L30

and if no target is passed then, policy.py add the default targets which is nothing but context.project_id (allow for everyone try to access)
- https://github.com/openstack/nova/blob/c16315165ce307c605cf4b608b2df3aa06f46982/nova/policy.py#L191

[1]
- https://github.com/openstack/nova/blob/e4ac401d1a9d5fba24bc22141b362a5400d9d096/nova/policies/server_topology.py#L24

** Affects: nova
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1870872

Title:
  server topology API policy is allowed for everyone even policy
  defaults is admin_or_owner

Status in OpenStack Compute (nova):
  New

Bug description:
  server topology index policy is default to admin_or_owner[1] but API
  is allowed for everyone.

  We can see the test trying with other project context can access the API
  - https://review.opendev.org/#/c/717524/

  This is because API does not pass the server project_id in policy target
  - https://github.com/openstack/nova/blob/e4ac401d1a9d5fba24bc22141b362a5400d9d096/nova/api/openstack/compute/server_topology.py#L30

  and if no target is passed then, policy.py add the default targets which is nothing but context.project_id (allow for everyone try to access)
  - https://github.com/openstack/nova/blob/c16315165ce307c605cf4b608b2df3aa06f46982/nova/policy.py#L191

  [1]
  - https://github.com/openstack/nova/blob/e4ac401d1a9d5fba24bc22141b362a5400d9d096/nova/policies/server_topology.py#L24

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