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## Summary This PR makes Windows sandbox proxying enforceable by routing proxy-only runs through the existing `offline` sandbox user and reserving direct network access for the existing `online` sandbox user. In brief: - if a Windows sandbox run should be proxy-enforced, we run it as the `offline` user - the `offline` user gets firewall rules that block direct outbound traffic and only permit the configured localhost proxy path - if a Windows sandbox run should have true direct network access, we run it as the `online` user - no new sandbox identity is introduced This brings Windows in line with the intended model: proxy use is not just env-based, it is backed by OS-level egress controls. Windows already has two sandbox identities: - `offline`: intended to have no direct network egress - `online`: intended to have full network access This PR makes proxy-enforced runs use that model directly. ### Proxy-enforced runs When proxy enforcement is active: - the run is assigned to the `offline` identity - setup extracts the loopback proxy ports from the sandbox env - Windows setup programs firewall rules for the `offline` user that: - block all non-loopback outbound traffic - block loopback UDP - block loopback TCP except for the configured proxy ports - optionally allow broader localhost access when `allow_local_binding=1` So the sandboxed process can only talk to the local proxy. It cannot open direct outbound sockets or do local UDP-based DNS on its own.The proxy then performs the real outbound network access outside that restricted sandbox identity. ### Direct-network runs When proxy enforcement is not active and full network access is allowed: - the run is assigned to the `online` identity - no proxy-only firewall restrictions are applied - the process gets normal direct network access ### Unelevated vs elevated The restricted-token / unelevated path cannot enforce per-identity firewall policy by itself. So for Windows proxy-enforced runs, we transparently use the logon-user sandbox path under the hood, even if the caller started from the unelevated mode. That keeps enforcement real instead of best-effort. --------- Co-authored-by: Codex <noreply@openai.com>