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[Rodolfo Alonso <1875516@xxxxxxxxxxxxxxxxxx>]

RFE implementation not attended, reopen if needed.

** Changed in: neutron
       Status: New => Won't Fix

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https://bugs.launchpad.net/bugs/1875516

Title:
  [RFE] Allow sharing security groups as read-only

Status in neutron:
  Won't Fix

Bug description:
  Currently, security groups can be shared with the rbac system, but the
  only valid action is `access_as_shared`, which allows the target
  tenant to create/delete (only) new rules on the security group. This
  works fine for use-cases where the group should be shared in a nearly
  equal way.

  [Problem description]
  Some users/services may want a security group to be visible, but read-only. A prime example of this would be to enable ProjectB to add a security group owned by ProjectA as a remotely trusted group on their own security group.
  The immediate need for this is found in the following Octavia patch:
  https://review.opendev.org/723735

  Octavia would like to share the security group it creates for each
  load-balancer with the load-balancer's owner, so they can open access
  to their backend members for only a specific load-balancer.

  [Proposed solution]
  Add a new action type for security group RBAC: `access_as_readonly` (or similar, name up for debate). This action would allow the target tenant to see the shared security group with Show/List, but not create/delete new rules for it or change it in any way.

  [Alternatives]
  Overload `access_as_external` to be valid for security groups as well, and define it to mean the same as above (entirely read-only access). This makes some sense, but it is probably cleaner to simply add a new action.

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