f41acfcc6e
Verified against nix/host-modules/hive-gateway/dnsmasq.nix + gateway.localNames contributors (hive-forge, hive-matrix, swarm-authelia): forge and the matrix gateway vhost are swarm-domain names (forge.<swarm-domain>, chat.<swarm-domain>), not sub-domains of the hive's own domain as the doc previously claimed.
267 lines
15 KiB
Markdown
267 lines
15 KiB
Markdown
# hive-network
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Host-side bridge + per-agent private-netns isolation — always on
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whenever hyperhive is enabled. Configured via
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`services.hyperhive.network.*`.
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> Isolation is the only mode — there is no shared-netns fallback. The
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> former `services.hyperhive.network.enable`,
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> `services.hyperhive.network.isolateContainers` and
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> `services.hyperhive.network.upstreamDns` options were removed; a
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> config that still sets one fails eval with a removal message.
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## Network map
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One picture of the whole hive. There are two planes: **infra
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containers share the host netns** and bind host ports directly;
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**compute containers (agents + CI) each get a private netns** behind
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the bridge. The unix-socket control plane rides the VFS and is
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untouched by any of it.
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```
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internet
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│ uplink NIC — NAT MASQUERADE for the
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│ bridge subnet (10.42.0.0/24 default)
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┌──────────────────────────┴─────────────────────────────────────────┐
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│ host netns — the host itself plus gateway / forge / matrix │
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│ │
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│ nginx :80/:443 [hive-gateway] │
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│ dnsmasq 10.42.0.1:53 (DNS) + :67 (DHCP) [hive-gateway] │
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│ forgejo :3000 http, :2222 git-ssh [hive-forge] │
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│ tuwunel :8008 client API [hive-matrix] │
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│ hive-c0re dashboard 127.0.0.1:7000 (host service) │
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│ wg-hive :51820/udp — swarm mesh, when enabled (host iface) │
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│ │
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│ hive-br0 10.42.0.1/24 │
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│ ┌──────────┼──────────────┐ │
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└──────────────┼──────────┼──────────────┼───────────────────────────┘
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vb-h-<a> vb-h-<b> vb-hive-ci veth pairs
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│ │ │
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┌────┴────┐ ┌───┴─────┐ ┌──────┴──┐ one private netns
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│ agent a │ │ agent b │ │ hive-ci │ each; eth0 leases
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│ eth0 │ │ eth0 │ │ eth0 │ from the DHCP pool
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└─────────┘ └─────────┘ └─────────┘
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```
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| container | netns | IPv4 | listens / reached via |
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| -------------- | ----------------------- | -------------------- | -------------------------------------------------------------------------------------------- |
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| `hive-gateway` | host (shared) | host addresses | nginx `:80`/`:443` (every vhost); dnsmasq `bridgeIp:53` + DHCP `:67` on the bridge |
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| `hive-forge` | host (shared) | host addresses | forgejo `:3000` http, `:2222` git-ssh; fronted by the `forge.<swarm-domain>` vhost |
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| `hive-matrix` | host (shared) | host addresses | tuwunel `:8008` (+ optional federation port); fronted by the matrix vhost |
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| `hive-ci` | private, veth on bridge | DHCP pool | outbound only (runner → forge); no inbound surface |
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| `h-<agent>` | private, veth on bridge | DHCP pool | web UI via UDS `/run/hive-agent/<name>` → nginx sub-path; in-container UI port hashed 8100–8999 |
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The flows, end to end:
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- **DHCP** — agent `dhcpcd` broadcasts on `eth0` → veth → bridge →
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host firewall (udp 67 hole) → dnsmasq pool → lease + router option.
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- **DNS** — agents query `bridgeIp:53`; hive zones are answered
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authoritatively with the bridge IP, everything else forwards to the
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host's resolvers (see *Resolver behaviour* below).
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- **HTTP** — `forge.` and `chat.` (under `swarm.domain`) plus the hive's
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own dashboard name resolve to the bridge IP, land on nginx
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`:80`/`:443`, and proxy to forgejo
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`:3000`, tuwunel `:8008`, hive-c0re `127.0.0.1:7000`, or a per-agent
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UI unix socket.
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- **Internet egress** — agent default route points at the bridge IP;
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the host forwards + masquerades out its uplink.
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- **Swarm** — peer hives connect over the `wg-hive` WireGuard mesh
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and reach each other's gateway/forge across it
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([`docs/swarm/`](swarm/README.md)).
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- **Control plane (no network)** — per-agent broker socket
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`/run/hive/mcp.sock`, privileged helper `/run/hive/priv.sock`,
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operator admin `/run/hyperhive/host.sock`, and the per-agent UI
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sockets under `/run/hive-agent/` are unix domain sockets
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bind-mounted through the VFS; private netns does not affect them.
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## Container shape (where dnsmasq lives)
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Co-located in the existing `hive-gateway` container — single
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front-door for both DNS and HTTP, saves a sibling container, single
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systemd-unit / state surface to monitor. The gateway shares host
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netns (`privateNetwork = false`) so dnsmasq's `bind-interfaces`
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listener on `bridgeIp` is on the host's bridge interface.
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## Configuration
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```nix
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{
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services.hyperhive = {
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enable = true;
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hiveName = "pr1ma";
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swarm.domain = "darkest.space";
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swarm.hives.pr1ma = { }; # -> domain = pr1ma.darkest.space
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# network.bridgeIp = "10.42.0.1"; # default
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};
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}
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```
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Requires `services.hyperhive.domain` to be set — the dnsmasq resolver
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is authoritative for `<hive-domain>` and its sub-domains. You do not
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write it: it is read from this hive's entry in the swarm directory
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(`docs/swarm/README.md` § Hive identity config).
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## Bridge addressing
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Default subnet is `10.42.0.0/24`, host-side gateway at `10.42.0.1`.
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RFC 1918 space, unlikely to clash with operator's existing setup;
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override `bridgeIp` + `bridgePrefixLength` if a different range is
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already in use. `/24` gives 254 usable per-agent addresses — enough
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for any single-host hive; bigger swarms or tighter addressing
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schemes pick their own.
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## Resolver behaviour
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dnsmasq is **authoritative** for the hive's own zone (`<hive-domain>`)
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plus whatever swarm-service names this host contributes via
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`gateway.localNames` — `forge.<swarm-domain>` and `chat.<swarm-domain>`
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(matrix) when this host runs those services, and `auth.<swarm-domain>`
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when it runs authelia — answering each with the bridge IP (where nginx
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is reachable). Note forge and matrix are swarm-domain names, not
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sub-domains of `<hive-domain>`: a swarm runs one forge and one
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homeserver, so their names belong to the swarm rather than to whichever
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hive happens to host them. Everything else is forwarded to the host's
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own resolvers: dnsmasq runs on the host and reads the host's
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`/etc/resolv.conf` directly. Containers don't need to know the
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upstream — they query the bridge IP and dnsmasq does the right thing
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per-name.
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There is deliberately no fallback `server=`: dnsmasq queries all known
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upstreams in parallel, so a hardcoded public resolver would take a share
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of normal traffic, not just cover the gap.
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dnsmasq runs on the host and reads the host's `/etc/resolv.conf`
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directly, so a network change (new router, new lease, laptop moving
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networks) reaches it the moment openresolv rewrites the file. There is
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nothing to synchronise and no unit watching for it.
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`bind-interfaces` + `interface = [ bridgeName "lo" ]` means the
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listener only accepts queries from the bridge interface (plus lo for
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container health-checks). External hosts can't reach it — no
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DNS-amplification surface even when the operator opens port 80 for
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gateway HTTP.
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`resolveLocalQueries = false` keeps dnsmasq out of the host's own
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resolution stack — the host's resolver (systemd-resolved, plain
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glibc nss, dnscrypt-proxy, etc.) keeps doing whatever the operator
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configured. The hive resolver is purely for inbound queries from
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agent containers.
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## Firewall posture
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`networking.firewall.interfaces.<bridge>.allowedUDPPorts = [ 53 67 ]`
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`networking.firewall.interfaces.<bridge>.allowedTCPPorts = [ 53 80 443 ]`
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- Port 53 opens the resolver on the bridge interface only. Other
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interfaces stay closed. The hive resolver isn't an external-facing
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service.
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- Port 67 (UDP) admits DHCP requests to the dnsmasq pool. dnsmasq
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receives DHCP via a regular UDP socket (it does not use a
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netfilter-bypassing raw socket), so the hole is mandatory — without
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it containers never get a lease and fall back to 169.254.x.x.
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- Ports 80 and 443 let isolated agents reach nginx (gateway
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container, shared host netns) for the forge sub-domain, per-agent
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UI proxies, and any other HTTP services.
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The **host** firewall is the only firewall. The shared-netns infra
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containers (gateway, forge, matrix) set
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`networking.firewall.enable = false`: a NixOS firewall inside a
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shared-netns container runs against the *host* ruleset — at container
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boot its `firewall-start` flushes the `nixos-fw` chains, rebuilds them
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from the container's (empty) port list, and deletes the host's
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`nixos-nat-*` chains without recreating them, silently wiping the
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bridge holes above plus the agents' NAT. Private-netns containers
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(agents, hive-ci) may keep their own firewall — it is scoped to their
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namespace.
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### Reaching host services (`exposeHostPorts`)
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By default agents can only reach the host on 80/443 (+53 DNS), so a
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host-side service on another port — e.g. a dev OTEL collector for
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`services.hyperhive.otel.endpoint` (see `docs/observability.md`) — is unreachable.
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`services.hyperhive.network.exposeHostPorts = [ 4318 ];` opens each
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listed TCP port `P` on the bridge-interface `allowedTCPPorts`, so an
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agent can connect to `<bridgeIp>:P` (point the collector endpoint at
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`http://<bridgeIp>:4318`, default `http://10.42.0.1:4318`).
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This is **firewall-only**: the host service must bind an address
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reachable from the bridge — `0.0.0.0` or the bridge IP — not loopback
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only. The bridge→`127.0.0.0/8` DROP rule (below) is unchanged, so a
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service bound to `127.0.0.1` only stays unreachable; rebind it to
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`0.0.0.0`.
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The port is reachable by **every** agent on the bridge subnet (like
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DNS/gateway), so only expose services safe for any agent to reach.
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## Container isolation
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Each agent container runs in a private network namespace with a dedicated
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veth pair attached to the bridge. The following table summarises what
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the nix side sets up unconditionally:
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| effect | mechanism |
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| -------------- | ------------------------------------------------------------------------------------------------------------------------------------- |
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| IP forwarding | `boot.kernel.sysctl."net.ipv4.ip_forward" = 1` |
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| Internet NAT | `networking.nat { enable = true; internalInterfaces = [ bridgeName ]; }` — MASQUERADE on packets leaving via any external NIC |
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| Loopback DROP | `networking.firewall.extraInputRules` — drops bridge-subnet → `127.0.0.0/8` traffic; defence-in-depth against routing table leaks |
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| Gateway access | `networking.firewall.interfaces.<bridge>.allowedTCPPorts = [ 80 443 ]` — lets isolated agents (private netns, veth on bridge) reach nginx on the host |
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| c0re signal | `HIVE_NETWORK_ISOLATION=1`, `HIVE_NETWORK_BRIDGE`, `HIVE_NETWORK_SUBNET` in `systemd.services.hive-c0re.environment` |
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`HIVE_NETWORK_SUBNET` is the host-side bridge IP + prefix (e.g.
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`10.42.0.1/24`), **not** the canonical network address. The Rust side
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must normalise (bitwise-AND with mask) before subnet membership checks or
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address arithmetic.
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### What the Rust side does
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`hive-c0re` reads `HIVE_NETWORK_ISOLATION` and passes
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`PRIVATE_NETWORK=1`, `LOCAL_ADDRESS=` (empty), `HOST_ADDRESS=<bridge-ip>`,
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and `HOST_BRIDGE=<bridgeName>` via `lifecycle::set_nspawn_flags` when
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creating or updating containers. `LOCAL_ADDRESS` is left empty so the
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container's dhcpcd acquires an address from the bridge dnsmasq pool
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(`networking.useDHCP = true` in `nix/agent-modules/network.nix`). This applies uniformly
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to all containers — agents and service containers alike.
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`HOST_ADDRESS` is the bridge gateway IP (the address part of
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`HIVE_NETWORK_SUBNET`, via `lifecycle::bridge_gateway_ip` — taken verbatim
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so a non-`.1` operator override still resolves to wherever the bridge
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actually lives). It is **load-bearing**: nixos-container's container-side
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network setup only installs a default route (`ip route add default via
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$HOST_ADDRESS`) when `HOST_ADDRESS` is non-empty. In bridge mode the
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host-side address/route setup is skipped, so writing it only affects the
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container's default route — without it the container comes up with an IP
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but no path off the bridge subnet (no internet, no `api.anthropic.com`).
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### How the isolated container gets its resolver
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nixos-container copies the **host's** `/etc/resolv.conf` into the container
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at every start. The host resolver (e.g. `127.0.0.53` from systemd-resolved,
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or a LAN router) is unreachable from a private netns and isn't
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authoritative for the hive's own zones, so it is replaced with the
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bridge dnsmasq at boot. Because the copy happens on every start, a
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declarative `environment.etc."resolv.conf"` would be clobbered — so the
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wiring is runtime:
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- `hive-priv` drops a marker file (`/etc/hyperhive-bridge-dns`, carrying the
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gateway IP) into each container's `/etc`.
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- the `hyperhive-isolated-dns` oneshot (`nix/agent-modules/network.nix`), gated on that
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marker, rewrites `/etc/resolv.conf` to `nameserver <gateway-ip>` at boot.
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It is ordered `before` the harness (`hive-ag3nt`), the matrix daemon, and
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`tea-login` so the resolver is correct before the first DNS lookup.
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**Why isolation is safe**: hive-c0re's control-plane sockets are unix
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domain sockets bind-mounted into containers, not network listeners — see
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the *Control plane (no network)* bullet under [Network
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map](#network-map) above. `PRIVATE_NETWORK=1` has no effect on a path
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that never touches the network stack.
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The nix side also enables IP forwarding + NAT (agents reach the internet
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through the host) and drops bridge-subnet → loopback traffic (defence-in-depth
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against a compromised agent reaching the c0re dashboard HTTP at
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`127.0.0.1`). Agents have no legitimate reason to reach the dashboard over
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loopback — the hive-c0re admin socket is a UDS, not TCP.
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## Cross-references
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- `docs/gateway.md` — vhost map + the gateway's other duties
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