Capability authorization
Capability authorization is the per-person check on which capability operations a requester may invoke.
POSIX decides what a process may touch on this machine. It cannot decide whether a person may send a message as the company or change a shared calendar, because those effects happen in the capability service with that service's authority. internal/access (CanAccess) is consulted before capability and record catalog tools are exposed, and it is the only per-person authorization on those operations. It sits in front of the service's socket; moving the decision into the service that performs the effect is open work.