142 lines
8.1 KiB
Markdown
142 lines
8.1 KiB
Markdown
# Vacuum Wall — Agent Instructions
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## What This Is
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SSL proxy / firewall appliance. Python 3.13+ Flask SPA behind nginx reverse proxy.
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Deploys on Debian 13 (trixie). Serves from repo root by default.
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## Architecture
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```
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Client ──→ nginx (SSL + basic auth) ──→ Flask (127.0.0.1:9090)
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Flask ──→ daemon/client.py (Unix socket) ──→ vacuum-walld (aiohttp, daemon.sock)
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vacuum-walld ──→ daemon/handlers/*.py ──→ sudo <cmd> ──→ system service
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```
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### Two-User Model with Shared Group
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- **`vacuum-walld`** (daemon user): runs the privileged background daemon with `NOPASSWD sudo` whitelist (`/etc/sudoers.d/vacuum-walld`). Owns socket. Primary group is the WebUI user's primary group. Daemon user name is derived: `USER_NAME` + `d`.
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- **WebUI user** (default: repo owner in `--dev` mode): runs the Flask process with **zero sudo** access. Communicates with the daemon via Unix socket.
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- **Shared group**: both users share the WebUI user's primary group. Socket is `vacuum-walld:<group>` with mode `0660`.
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### Code Layout
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- `webui/server.py` — Flask app entry point. **Only** file that creates the `app`. SPA catch-all renders `index.html` with server-side `__WS_URL_PLACEHOLDER__` substitution (no Jinja).
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- `webui/api/*.py` — Flask blueprints, one per subsystem. Routes prefix `/api/<subsystem>/`. All call `daemon.client` instead of `lib/` directly.
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- `webui/api/common.py` — Shared `_ok()` / `_error()` response helpers used by all blueprints.
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- `daemon/server.py` — aiohttp server, route registry, batch routing, WebSocket broadcast, state refresh.
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- `daemon/client.py` — Sync HTTP client over Unix socket using `requests_unixsocket.Session`.
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- `daemon/iface.py` — **Single source of truth** for all daemon API endpoints. Every endpoint is a frozen `(method, path)` tuple. Renaming an endpoint here auto-updates both server registry and client calls. All blueprints and handlers import from here.
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- `daemon/handlers/*.py` — Privileged operation handlers (all `sudo` calls live here).
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- `lib/state.py` — In-memory state store with per-subsystem collectors. Populated at daemon startup, refreshed on request. Backs WebSocket versioning/broadcast.
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- `lib/common.py` — Shared utilities: `run()`, `run_proc()`, `load_json()`, `save_json()`, `deep_merge()`, `ensure_dirs()`, `validate_interface_name()`. All `lib/` modules use these instead of defining local helpers.
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- `lib/logging.py` — Logging setup used by both webui and daemon.
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- `lib/*.py` — Backend modules (parsing, config, shared logic). Full type hints and `__all__` exports. No sudo calls.
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- `vendor/` — Vendored scripts and JS libraries (`acme.sh`, `htmx`, `json-enc`).
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- `data/` — Runtime artifacts (generated .confs, `.htpasswd`, ACME certs, firewall backup, dnsmasq fragments).
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- `config/<subsystem>/config.json` — Declarative JSON configs (source of truth). Generated `.conf` in `data/nginx/sites-enabled/`. Certs in `data/acme/`.
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- `system/` — System file templates. `systemd/` (units installed to `/etc/systemd/system/`), `sudoers.d/`, `nginx/`.
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Project uses `.venv`. Install deps with `pip install -e .` (from `pyproject.toml`). `__init__.py` files in `webui/` and `lib/` are intentionally empty.
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### Frontend (hoover)
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Custom reactive SPA framework at `webui/static/hoover/`. Provides VDOM rendering, reactivity, router, WebSocket bindings, API helpers, and shared UI components. Exported via `hoover/index.js`. Pages in `webui/static/pages/` each define a route using `definePage()`. Bootstrap is `webui/static/app.js`. No build step — served raw.
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### Daemon Endpoints
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- Unix socket at `data/daemon.sock` (configurable via `VACUUM_WALLD_SOCKET` env var)
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- WebSocket at `127.0.0.1:9091` (configurable via `VACUUM_WALLD_WS_PORT`) for real-time state change notifications
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- Can also be started as `python -m daemon` or via the `vacuum-walld` console script
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## Environment Variables
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- `VACUUM_WALL_DEV` — dev mode flag; when set, disables aggressive static asset caching
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- `VACUUM_WALLD_SOCKET` — override daemon socket path
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- `VACUUM_WALLD_WS_PORT` — override WebSocket port (default `9091`)
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## Deployment
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`install.sh` installs only system components and configures them; the project serves from the repo root by default. Options via env vars or CLI flags (CLI takes precedence). Set `INSTALL_DIR` or `--path` to override. Use `--dev` to auto-detect repo owner as service user; non-dev requires `--user`.
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All Python modules use `Path(__file__).resolve().parent.parent` for `PROJECT_DIR` — no hardcoded paths. ACME certs at `PROJECT_DIR/data/acme/`.
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### Service Start Order
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`firewalld` → `avahi-daemon` → `dnsmasq` → `vacuum-walld` → `vacuum-wall`
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## Local Dev
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```bash
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.venv/bin/python webui/server.py # binds 127.0.0.1:9090
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```
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Reload running Flask via SIGHUP (auto-reloads `webui.*` and `lib.*` modules, then SIGTERM restart).
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In production: systemd units run with `NoNewPrivileges`, `ProtectSystem=strict`, loopback-only networking.
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## Blueprint ↔ lib Mapping
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| Blueprint | URL prefix | Backend module |
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|-----------------------|-------------------|------------------|
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| `webui/api/firewall` | `/api/firewall/` | `lib.firewall` |
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| `webui/api/dhcp` | `/api/dhcp/` | `lib.dnsmasq` |
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| `webui/api/proxy` | `/api/proxy/` | `lib.nginx` |
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| `webui/api/certs` | `/api/certs/` | `lib.acme` |
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| `webui/api/wireguard` | `/api/wireguard/` | `lib.wireguard` |
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| `webui/api/network` | `/api/network/` | `lib.network` |
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| `webui/api/logs` | `/api/logs/` | `lib.logging` |
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## Privileged Operations
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`daemon/handlers/*.py` call `sudo` for everything that touches system services. Whitelist is `system/sudoers.d/vacuum-walld`.
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**acme.sh must never run as root** — always as the service user via `sudo -u`.
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Pattern for mutations: write JSON → render native config → `sudo <cmd>` to apply.
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Adding a new privileged command requires a sudoers entry **and** the `daemon/handlers/` code.
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## API Response Contract
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- Success: `{"ok": true, "data": <value>}` — helper `_ok(data)` from `webui.api.common`
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- Error: `{"ok": false, "error": "msg"}` — helper `_error(msg, code=400)` from `webui.api.common`
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- `acme.issue()` / `acme.renew()` raise `RuntimeError` on failure — API layer wraps in try/except
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- HTTP codes: `400` bad request, `404` not found, `500` internal failure
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## Deploy
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`install.sh` is the single deploy script. Run as root. Only `MGMT_PASS` is strictly required; `MGMT_DOMAIN` is auto-detected from hostname.
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## Lint and Tests
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**Linter / formatter:** Ruff (`ruff check` + `ruff format`). Config in `pyproject.toml` under `[tool.ruff]`.
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**Tests:** pytest in `tests/`. Run with `python -m pytest`. Tests mock out subprocess calls (firewalld, acme.sh, WireGuard, nginx, dnsmasq) — no system services required.
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```bash
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.venv/bin/ruff check lib/ webui/ tests/ # lint
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.venv/bin/ruff format lib/ webui/ tests/ # format
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.venv/bin/python -m pytest tests/ -v # test
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```
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Install dev tooling with `pip install -e ".[dev]"`.
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## Docs
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`docs/` contains the authoritative reference for each subsystem. **Before reasoning about any subsystem**, read the relevant doc(s) below.
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| Doc | Contents |
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|-----|----------|
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| `docs/architecture.md` | Request flow, subsystem communication, two-user model, zone model, state management |
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| `docs/security.md` | Privilege model, sudo whitelist, systemd hardening, TLS config, zone trust levels |
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| `docs/deployment.md` | Install script options, what install.sh does, post-install setup, troubleshooting |
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| `docs/config.md` | JSON schema for each subsystem config (dnsmasq, nginx, wireguard, cert types) |
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| `docs/api.md` | REST API endpoint reference, request/response contracts, route patterns |
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| `docs/overview.md` | Subsystem summaries, tech stack, complete project directory tree |
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## Important Rules
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1. Ask, don't assume. If something is unclear, ask before writing a single line.
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2. Simplest solution first. Always implement the simplest thing that could work.
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3. Don't touch unrelated code. If a file or function is not directly part of the current task, do not modify it.
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4. Flag uncertainty explicitly. If you are not confident about an approach or technical detail, say so.
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