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114 lines
5.3 KiB
Markdown
114 lines
5.3 KiB
Markdown
# Swarm UI
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The swarm's own web surface, served by the gateway on the **swarm apex**
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(`services.hyperhive.swarm.domain`) and readable only by operators.
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Distinct from the per-hive dashboard, which lives on the hive domain and
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answers for one host. This one is the view _across_ hives.
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## Enabling
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```nix
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services.hyperhive.deploy.swarm-ui.enable = true; # defaults to deploy.swarm-controller.enable
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```
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Derived from the controller rather than from `allSwarmServices`:
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the UI is a view onto the controller's state and reaches it over that
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daemon's socket, so the host that runs the controller is the host that
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can serve the UI. A hive that merely _uses_ a swarm has nothing to serve.
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The UI answers on `services.hyperhive.swarm.domain` and nothing else. It
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shares that name with the swarm-controller it fronts — one service to a
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reader and to a certificate — so there is no separate option to pin.
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> The apex must differ from `services.hyperhive.domain`. The gateway's
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> default server already answers for the hive domain, and two vhosts
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> claiming one `server_name` do not error — nginx picks one — so this is
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> an assertion rather than a runtime surprise.
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## 🔑 You must be in the `admins` group
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**This is the step that separates "protected" from "locked out".** The
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vhost's `auth_request` asks authelia _"is there a session"_; the rule
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that makes it mean _"is this an operator"_ is an `access_control` entry
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requiring `group:admins`. An account without that group authenticates
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fine and still gets bounced.
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```sh
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swarmctl user add <you> --group admins
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```
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`admins` deliberately, not a new word: [`../getting-started/setup.md`](../getting-started/setup.md) has
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told every operator to create exactly that group since the bootstrap step
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existed, so an account made by following the guide already passes. This
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is the first rule that _consumes_ a group name — inventing a second one
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would have meant those accounts silently failing a check they were
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supposed to pass.
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An account created without any group needs re-adding with the flag —
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`swarmctl` reads the existing entry out of `users.yml`, so the group is
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what changes.
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Why a group and not a list of usernames: agents are getting authelia
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accounts of their own (matrix SSO), and _authenticated_ would then
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include every agent in the hive. The group is the only thing standing
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between "an operator's page" and "anyone with a session".
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## What it costs to be reachable
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The apex is published to the hive's resolver like every other swarm
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service, so agent containers can resolve it. That is deliberate and it is
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not a hole: **reachability is not the access control here.** An agent
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that resolves the name and connects still has no operator session, and
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the subrequest denies it.
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## Two wiring sites
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Adding a swarm service name means touching two things. Missing the
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second ships as a different flavour of "works from the host, broken from
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a container":
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| site | file |
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| ---------------------------- | --------------------------------------------------------------- |
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| vhost + `gateway.localNames` | the service's own module (e.g. `nix/host-modules/swarm-ui.nix`) |
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| **certificate name** | `nix/host-modules/swarm.nix` (`serviceDomains`) |
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The DNS record and the local-dev `/etc/hosts` entry need no separate
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edit: both are derived from `services.hyperhive.gateway.localNames`,
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which a service's own module already has to push its domain into to be
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resolvable — see `nix/host-modules/hive-gateway/dnsmasq.nix` and
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`.../default.nix`'s `networking.hosts`. `vhosts.nix` itself is scoped to
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the surface the hive's own domain serves (dashboard, per-agent routing,
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matrix discovery); a swarm service declares its own vhost next to its
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own options, the way `swarm-ui.nix` and `swarm-authelia.nix` do.
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⚠️ The certificate one is the least obvious and the most visible when
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missed. `serviceDomains` is _both_ the services sub-CA's
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`nameConstraints` set and the leaf's SAN list, and the apex is a
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**sibling** of `forge.<swarm>` / `chat.<swarm>` / `auth.<swarm>`, not a
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parent — no CA in the hierarchy issues for it implicitly. Left out, the
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vhost falls back to the hive leaf and the swarm's front page opens with a
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name mismatch.
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## Quick links
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The swarm UI's header carries a single 🔗 button, visible on every route,
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opening a popover of links to other swarm-wide services — authelia,
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matrix, forge, this UI's own swagger docs. Backed by `GET /api/links`
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(swarm-controller), which serves `services.hyperhive.swarm.controller.links`
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(a `listOf { label, icon, url }`, same shape as the per-agent
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`hyperhive.dashboardLinks`).
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Rather than one central hardcoded list, each service's own module
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contributes its own entry when it's actually enabled on the controller's
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host — `swarm-authelia.nix`, `hive-matrix.nix` and `hive-forge/default.nix`
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all do, the same list-merge idiom `gateway.localNames` uses above. Adding a
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link for a new service is a nix-only change to that service's own module
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(or an operator adding an entry directly); no swarm-controller or swarm-ui
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change needed. Empty list hides the button rather than showing an empty
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popover.
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## Cross-references
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- [`sso.md`](sso.md) — the authelia instance itself, and the user store.
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- [`../networking/gateway.md`](../networking/gateway.md) — the full vhost map and TLS modes.
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