gatekeeper
n.a person or system that controls who can enter a place or who can get information. In computing, it is often a security tool that checks if a request is safe.
n.a person or entity that controls access to a resource, information, or location. In technical contexts, it refers to a security mechanism or software that filters and authorizes network traffic or data requests.
“The security guard acts as a gatekeeper for the building.”
“In many organizations, the manager serves as a gatekeeper, deciding which projects receive funding and which do not.”
“Modern cybersecurity architectures often employ a gatekeeper at the network perimeter to filter out malicious traffic before it can reach internal servers or sensitive databases.”
“It urged cinemas to "act as gatekeepers for the audience, and clearly reject films that are obviously not up to standard instead of letting films like Niu Lai run rampant".”
“These gatekeepers understand that working-class people have a harder time running for office .”
From gate + keeper.
Etymology adapted from Wiktionary, available under CC BY-SA 4.0.