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fix: use forge domain URL + open 80/443 for isolated agents

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when isolateContainers=true, isolated agents have dnsmasq as their
resolver — forge.<domain> resolves to bridgeIp. route HIVE_FORGE_URL
through nginx on port 80 instead of exposing the raw forge port.

- HIVE_FORGE_URL: http://<forge.domain> when isolated (nginx proxies)
- bridge firewall: open 80+443 for agents to reach nginx (gateway)
- remove forge-specific httpPort rule (no longer needed)
- update docs/gateway.md + docs/network.md

per mara's review comment on PR #1150.
This commit is contained in:
atlas 2026-06-03 16:10:32 +02:00 • committed by mara
commit 806d0e4a61
4 changed files with 28 additions and 31 deletions
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19
docs/gateway.md
View file

@ -200,27 +200,22 @@ dashboard reach by design — the surface is privileged (approve /
deny / destroy) and must not be exposed without a real reverse
proxy in front.
## `HIVE_FORGE_URL`: bridge gateway for isolated agents, loopback for shared-netns
## `HIVE_FORGE_URL`: domain via gateway for isolated agents, loopback for shared-netns
Agents poll `HIVE_FORGE_URL` for Forgejo notifications + run all
`hive-forge` calls against it. `hive-c0re.nix` sets this based on the
network isolation mode:
- **`network.isolateContainers = true`**: agents run in private netns,
so host loopback is unreachable. `HIVE_FORGE_URL` is set to
`http://<bridgeIp>:<forge.httpPort>`. Forgejo binds `0.0.0.0` so it's
reachable at the bridge gateway IP. `hive-network.nix` opens
`forge.httpPort` on the bridge interface automatically.
- **`network.isolateContainers = true`**: agents run in private netns and
get the bridge dnsmasq as their resolver. `HIVE_FORGE_URL` is set to
`http://<forge.domain>` (default `forge.<hive-domain>`). Agents resolve
the hostname via dnsmasq → bridge IP, then reach nginx on port 80 (bridge
firewall opens 80+443 when isolation is on). nginx proxies to forgejo — the
same path an operator browser takes, no raw port exposure needed.
- **`network.isolateContainers = false`** (default): agents share the host's
network namespace, so loopback reaches forgejo directly. `HIVE_FORGE_URL`
is `http://127.0.0.1:<forge.httpPort>`.
The sub-domain default (`forge.<hive-domain>`) is for **operator
browsers + cross-host clients**, not in-cluster traffic. Using the
sub-domain URL inside agent containers would fail every `hive-forge`
invocation with "Name or service not known" — the agent's nspawn
doesn't have DNS for the external hostname.
## hive-forge container shape
Private Forgejo wrapped in a nixos-container (`hive-forge`, not

9
docs/network.md
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@ -95,6 +95,11 @@ agent containers.
interface only. Other interfaces stay closed. The hive resolver
isn't an external-facing service.
When `isolateContainers = true`, `allowedTCPPorts` is extended with
`[ 80 443 ]` so isolated agents can reach nginx (gateway container,
shared host netns) for the forge sub-domain, per-agent UI proxies,
and any other HTTP services.
## Container isolation
`services.hyperhive.network.isolateContainers` (default `false`) flips
@ -108,8 +113,8 @@ agent containers from shared host netns to private netns. Set only after
| IP forwarding | `boot.kernel.sysctl."net.ipv4.ip_forward" = 1` |
| Internet NAT | `networking.nat { enable = true; internalInterfaces = [ bridgeName ]; }` — MASQUERADE on packets leaving via any external NIC |
| Loopback DROP | `networking.firewall.extraInputRules` — drops bridge-subnet → `127.0.0.0/8` traffic; defence-in-depth against routing table leaks |
| Forge access | `networking.firewall.interfaces.<bridge>.allowedTCPPorts` — opens `forge.httpPort` on the bridge interface so isolated agents can reach forgejo at `<bridgeIp>:<httpPort>` |
| Forge URL | `HIVE_FORGE_URL` flips from `http://127.0.0.1:3000` to `http://<bridgeIp>:3000` — forwarded to containers via meta flake |
| Gateway access | `networking.firewall.interfaces.<bridge>.allowedTCPPorts = [ 80 443 ]` — lets isolated agents reach nginx on the host (shared netns) |
| Forge URL | `HIVE_FORGE_URL` flips from `http://127.0.0.1:3000` to `http://forge.<domain>` — agents resolve via dnsmasq, nginx proxies to forgejo |
| c0re signal | `HIVE_NETWORK_ISOLATION=1`, `HIVE_NETWORK_BRIDGE`, `HIVE_NETWORK_SUBNET` in `systemd.services.hive-c0re.environment` |
`HIVE_NETWORK_SUBNET` is the host-side bridge IP + prefix (e.g.