diff --git a/backend/.env.example b/backend/.env.example index af1d43f..6ff5ea9 100644 --- a/backend/.env.example +++ b/backend/.env.example @@ -1,6 +1,7 @@ # Copy to .env on the VPS. Never commit the real file. -# Port the Node process binds to (localhost only, nginx proxies to it). +# Port the Node process binds to (localhost only, the reverse proxy - nginx +# or Caddy - proxies to it). PORT=3001 # Comma separated list of origins allowed to POST to the endpoint. @@ -23,7 +24,7 @@ SMTP_FROM= # openssl rand -hex 32 WEBHOOK_SECRET= -# Port the webhook listener binds on (127.0.0.1 only - never exposed). +# Port the webhook listener binds on. WEBHOOK_PORT=3002 # Only pushes to this ref trigger a deploy. Change if the default branch is @@ -33,3 +34,15 @@ WEBHOOK_BRANCH=refs/heads/master # Optional. Only needed if the checkout lives somewhere other than # /opt/audit-endpoint (deploy.sh's default). # REPO_DIR=/opt/audit-endpoint + +# --- Reverse proxy running in Docker (e.g. Caddy) --------------------------- +# Only needed if whatever proxies requests to these two services (audit +# endpoint + webhook) itself runs in a Docker container. 127.0.0.1 inside +# that container is its own loopback, not this host's, so both services also +# bind this address in addition to 127.0.0.1. Leave unset if the proxy runs +# natively on this machine. +# +# Find the value with (replace with your proxy container's name): +# docker inspect --format \ +# '{{range $k, $v := .NetworkSettings.Networks}}{{$k}}: {{$v.Gateway}}{{"\n"}}{{end}}' +# DOCKER_BRIDGE_HOST=172.19.0.1 diff --git a/backend/deploy/DEPLOYMENT.md b/backend/deploy/DEPLOYMENT.md index 432b73a..7b0fe1d 100644 --- a/backend/deploy/DEPLOYMENT.md +++ b/backend/deploy/DEPLOYMENT.md @@ -27,17 +27,19 @@ Nothing below works until this answers. ```bash ssh @ -# Which web server is in front? The nginx config below assumes nginx. -systemctl is-active nginx apache2 2>/dev/null +# Which reverse proxy is in front? Step 7 covers both nginx (native) and +# Caddy (in Docker, e.g. alongside Forgejo) - this decides which branch. +systemctl is-active nginx apache2 2>/dev/null || echo "no native web server" +docker ps -# Is port 3001 free? Gitea commonly sits on 3000, so check before assuming. +# Is port 3001 free? Forgejo/Gitea commonly sits on 3000, check before assuming. sudo ss -tlnp | grep -E ':(3000|3001)\b' || echo "3001 frei" # Node 20 or newer present? node --version 2>/dev/null || echo "Node fehlt" ``` -If **Apache** is in front instead of nginx, skip step 6 and set up an Apache +If **Apache** is in front instead, skip step 6 and set up an Apache `ProxyPass` for `api.sascha-bach.de` instead — the rest is unchanged. If **3001 is taken**, pick another free port and change it in three places: @@ -135,7 +137,16 @@ curl -s http://127.0.0.1:3001/health # → {"status":"ok"} --- -## 7. nginx vhost +## 7. Reverse proxy vhost + +Which of the two applies was already checked in step 1. If unsure, check now: + +```bash +which nginx 2>/dev/null && echo "nginx" || echo "no native nginx" +docker ps # look for a caddy/nginx/traefik container +``` + +### 7a. nginx runs natively on this machine Adding a file and reloading never touches the running Git or Nextcloud vhosts. @@ -152,9 +163,70 @@ sudo nginx -t sudo systemctl reload nginx ``` +Then continue with **8a** below. + +### 7b. Caddy runs in Docker (e.g. alongside Forgejo) + +This is the actual setup found on this VPS: Forgejo + Caddy run via +docker-compose (project `forgejo`, at `/root/forgejo/docker-compose.yml`), +Caddy terminating TLS for `git.sascha-bach.de` and `talk.sascha-bach.de`. + +Since Caddy itself runs in a container, `127.0.0.1` from its point of view is +the container's own loopback, not this host - it cannot reach the audit +services' `127.0.0.1` listeners at all. This is why `server.js` and +`webhook/server.js` also bind an additional address when `DOCKER_BRIDGE_HOST` +is set - **do that first**, before touching Caddy: + +```bash +# Confirm the gateway IP for the network Caddy is on (should match what was +# found earlier: forgejo_web -> 172.19.0.1). Re-run this if the network is +# ever recreated - the address is not guaranteed to stay the same forever. +docker inspect forgejo-caddy-1 --format \ + '{{range $k, $v := .NetworkSettings.Networks}}{{$k}}: {{$v.Gateway}}{{"\n"}}{{end}}' +``` + +Add to `/opt/audit-endpoint/backend/.env`: + +```env +DOCKER_BRIDGE_HOST=172.19.0.1 +``` + +```bash +sudo systemctl restart audit-endpoint +sudo systemctl restart audit-webhook +``` + +Then append a **new, independent** block to the existing Caddyfile - this +does not touch the `git.sascha-bach.de` or `talk.sascha-bach.de` blocks: + +```bash +sudo tee -a /root/forgejo/Caddyfile > /dev/null <<'EOF' + +api.sascha-bach.de { + handle /deploy-webhook { + reverse_proxy 172.19.0.1:3002 + } + handle { + reverse_proxy 172.19.0.1:3001 + } +} +EOF +``` + +Reload without restarting the container (existing connections to Forgejo/Talk +are not dropped): + +```bash +docker exec forgejo-caddy-1 caddy reload --config /etc/caddy/Caddyfile +``` + +Caddy provisions its own Let's Encrypt certificate for `api.sascha-bach.de` +automatically the first time it is requested - **skip step 8 entirely**, go +straight to step 9. + --- -## 8. TLS certificate +## 8. TLS certificate (nginx only - Caddy already did this in 7b) ```bash sudo apt-get install -y certbot python3-certbot-nginx # if missing @@ -223,24 +295,24 @@ Without this, updating means SSHing in and running the commands under your own Gitea/Forgejo trigger a pull + restart automatically. **Check this first:** run `docker ps` to see whether Gitea/Forgejo runs in a -Docker container. This decides which of the two setups below applies. +Docker container. This decides which of the two setups below applies - see +step 7 for the same branch applied to the audit endpoint itself. **Gitea runs natively on this machine (not in Docker):** the webhook listener never needs to be reachable from the internet - it binds to `127.0.0.1` only, and Gitea calls it over loopback. Use `http://127.0.0.1:3002/deploy-webhook` -as the Target URL in step 11.4 and skip the nginx part of step 11.3. +as the Target URL in step 11.4, and skip the Caddy/nginx part of step 11.3. -**Gitea runs in Docker:** inside that container, `127.0.0.1` is the -container's own loopback, not this host - a target of `127.0.0.1:3002` would -never connect, regardless of Docker's networking mode. Rather than depending -on that container's specific network setup (bridge vs. host, custom networks, -`host.docker.internal` availability - all of which vary by how it was set -up), route the webhook through the same nginx vhost as the audit endpoint -instead: the request just goes out over HTTPS to `api.sascha-bach.de` and -back in, exactly like any other webhook call, independent of how Gitea's -container is networked. `backend/deploy/nginx-api.sascha-bach.de.conf` -already has the `/deploy-webhook` location for this - see step 11.3. Use -`https://api.sascha-bach.de/deploy-webhook` as the Target URL in step 11.4. +**Gitea runs in Docker** (the actual case on this VPS - Forgejo alongside +Caddy): inside that container, `127.0.0.1` is the container's own loopback, +not this host - a target of `127.0.0.1:3002` would never connect, regardless +of Docker's networking mode. Route the webhook through the same reverse +proxy vhost set up for the audit endpoint in step 7 instead: the request +just goes out over HTTPS to `api.sascha-bach.de` and back in, exactly like +any other webhook call, independent of how Gitea's container is networked. +Step 7b's Caddy block already includes the `/deploy-webhook` route - see +step 11.3. Use `https://api.sascha-bach.de/deploy-webhook` as the Target URL +in step 11.4. ### 11.1 Generate a secret and configure it @@ -281,16 +353,11 @@ sudo systemctl enable --now audit-webhook systemctl status audit-webhook --no-pager ``` -**Only if Gitea runs in Docker**, additionally expose it through nginx (the -config was already updated when you copied it in step 7 - if that was before -this section existed, re-copy it): - -```bash -sudo cp /opt/audit-endpoint/backend/deploy/nginx-api.sascha-bach.de.conf \ - /etc/nginx/sites-available/api.sascha-bach.de -sudo nginx -t -sudo systemctl reload nginx -``` +**Only if Gitea runs in Docker**, the `/deploy-webhook` route was already +added in step 7b - nothing further to do here. If step 7 was done with +nginx instead (7a), add the same location manually to +`nginx-api.sascha-bach.de.conf` (mirroring the `/api/audit-request` block, +just pointing at port 3002) and reload. ### 11.4 Register the webhook in Gitea/Forgejo diff --git a/backend/package-lock.json b/backend/package-lock.json new file mode 100644 index 0000000..00eaa8e --- /dev/null +++ b/backend/package-lock.json @@ -0,0 +1,989 @@ +{ + "name": "portfolio-audit-endpoint", + "version": "1.0.0", + "lockfileVersion": 3, + "requires": true, + "packages": { + "": { + "name": "portfolio-audit-endpoint", + "version": "1.0.0", + "dependencies": { + "cors": "^2.8.5", + "dotenv": "^17.2.2", + "express": "^5.1.0", + "express-rate-limit": "^8.1.0", + "express-validator": "^7.2.1", + "helmet": "^8.1.0", + "nodemailer": "^7.0.6" + }, + "engines": { + "node": ">=20" + } + }, + "node_modules/accepts": { + "version": "2.0.0", + "resolved": "https://registry.npmjs.org/accepts/-/accepts-2.0.0.tgz", + "integrity": 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nginx, so trust exactly one proxy hop. Without this the rate limiter -// would see the proxy IP for everyone and throttle all visitors together. +// Behind a reverse proxy, so trust exactly one proxy hop. Without this the +// rate limiter would see the proxy's IP for everyone and throttle all +// visitors together. app.set('trust proxy', 1) app.use(helmet()) @@ -54,6 +56,25 @@ app.use((error, _req, res, _next) => { }) const port = Number(env('PORT', '3001')) + app.listen(port, '127.0.0.1', () => { console.log(`Audit endpoint listening on 127.0.0.1:${port}`) }) + +// Optional second listener for a reverse proxy that itself runs in Docker +// (e.g. Caddy). 127.0.0.1 inside that proxy's container is the container's +// own loopback, not this host's, so it cannot reach the 127.0.0.1 listener +// above at all. The fix is NOT to bind 0.0.0.0 - on a VPS with a public IP +// and no confirmed firewall, that would also accept connections arriving on +// the public interface, bypassing the proxy's TLS termination entirely. +// Binding this second, additional listener to the Docker bridge's gateway +// address instead only accepts traffic arriving over that specific virtual +// network. Find the right value with: +// docker inspect --format \ +// '{{range $k, $v := .NetworkSettings.Networks}}{{$k}}: {{$v.Gateway}}{{"\n"}}{{end}}' +const dockerBridgeHost = env('DOCKER_BRIDGE_HOST') +if (dockerBridgeHost) { + http.createServer(app).listen(port, dockerBridgeHost, () => { + console.log(`Audit endpoint also listening on ${dockerBridgeHost}:${port} (Docker bridge)`) + }) +} diff --git a/backend/webhook/server.js b/backend/webhook/server.js index 92e88cb..9d24ee8 100644 --- a/backend/webhook/server.js +++ b/backend/webhook/server.js @@ -4,15 +4,16 @@ import { createHmac, timingSafeEqual } from 'node:crypto' import { fileURLToPath } from 'node:url' import { dirname, join } from 'node:path' import { config } from 'dotenv' +import { env } from '../services/env.js' const __dirname = dirname(fileURLToPath(import.meta.url)) // Shares backend/.env with the audit endpoint rather than keeping a second // secrets file - one chmod 600 file to manage, not two. config({ path: join(__dirname, '..', '.env') }) -const PORT = Number(process.env.WEBHOOK_PORT ?? 3002) -const SECRET = process.env.WEBHOOK_SECRET -const BRANCH = process.env.WEBHOOK_BRANCH ?? 'refs/heads/master' +const PORT = Number(env('WEBHOOK_PORT', '3002')) +const SECRET = env('WEBHOOK_SECRET') +const BRANCH = env('WEBHOOK_BRANCH', 'refs/heads/master') if (!SECRET) { console.error('WEBHOOK_SECRET is not configured. Refusing to start.') @@ -65,7 +66,9 @@ function runDeploy() { ) } -const server = http.createServer((req, res) => { +// Extracted so it can back two separate http.Server instances - see the +// dual-listen comment below. +function requestHandler(req, res) { if (req.method !== 'POST' || req.url !== '/deploy-webhook') { res.writeHead(404).end() return @@ -113,8 +116,21 @@ const server = http.createServer((req, res) => { res.writeHead(202).end('Deploy queued.') runDeploy() }) -}) +} -server.listen(PORT, '127.0.0.1', () => { +http.createServer(requestHandler).listen(PORT, '127.0.0.1', () => { console.log(`Deploy webhook listening on 127.0.0.1:${PORT}`) }) + +// Optional second listener for when Gitea/Forgejo (or the reverse proxy in +// front of it, e.g. Caddy) runs in Docker: 127.0.0.1 inside that container is +// the container's own loopback, not this host's, so it cannot reach the +// listener above. Binds only the Docker bridge's gateway address rather than +// 0.0.0.0, so this stays unreachable from the VPS's public interface. See +// the matching comment in ../server.js for how to find the right value. +const dockerBridgeHost = env('DOCKER_BRIDGE_HOST') +if (dockerBridgeHost) { + http.createServer(requestHandler).listen(PORT, dockerBridgeHost, () => { + console.log(`Deploy webhook also listening on ${dockerBridgeHost}:${PORT} (Docker bridge)`) + }) +}