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Copy pathcustom-server.js
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139 lines (132 loc) · 5.57 KB
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const http = require("http");
const path = require("path");
const fs = require("fs");
const crypto = require("crypto");
const { pathToFileURL } = require("url");
const origCreate = http.createServer.bind(http);
// Per-process secret proving x-9r-real-ip was stamped below rather than sent by the client.
// A bare `next start` / `next dev` never loads this file, so it cannot produce a matching
// header even though the env var is inherited by child processes. Named like x-9r-cli-token
// so the request-detail header sanitizer redacts it too.
const PEER_TOKEN = crypto.randomBytes(24).toString("hex");
process.env.NINEROUTER_PEER_TOKEN = PEER_TOKEN;
let backgroundRefreshStarted = false;
function startBackgroundTokenRefreshFromCustomServer() {
if (backgroundRefreshStarted) return;
backgroundRefreshStarted = true;
// Prefer source path (repo / standalone that still has src). Fail-open if missing
// — initializeApp also starts the same scheduler when the Next app boots.
const modPath = path.join(__dirname, "src", "sse", "services", "backgroundTokenRefresh.js");
import(pathToFileURL(modPath).href)
.then((m) => {
try {
m.startBackgroundTokenRefresh();
} catch (e) {
console.error("[BackgroundTokenRefresh] start failed:", e && e.message ? e.message : e);
}
const stop = () => {
try {
m.stopBackgroundTokenRefresh();
} catch {
/* ignore */
}
};
process.once("SIGINT", stop);
process.once("SIGTERM", stop);
})
.catch((e) => {
// Expected in published CLI standalone (src/ not on disk). App bootstrap covers it.
if (process.env.DEBUG_BACKGROUND_TOKEN_REFRESH) {
console.error("[BackgroundTokenRefresh] import failed:", e && e.message ? e.message : e);
}
});
}
// Wrap Next standalone HTTP server: derive client IP from the TCP socket
// (unspoofable) and strip client-supplied forwarding headers so downstream
// rate-limiting keys on the real peer address instead of attacker-controlled XFF.
http.createServer = (...args) => {
const handler = args.find((a) => typeof a === "function");
const rest = args.filter((a) => typeof a !== "function");
if (!handler) return origCreate(...args);
const wrapped = (req, res) => {
const socketIp = req.socket && req.socket.remoteAddress ? req.socket.remoteAddress : "";
const xff = req.headers["x-forwarded-for"];
const xRealIp = req.headers["x-real-ip"];
const viaProxy = !!(xff || xRealIp);
const isLoopbackProxy = socketIp === "127.0.0.1" || socketIp === "::1" || socketIp === "::ffff:127.0.0.1";
// Trust forwarding headers only when the TCP peer is a local reverse proxy.
// Direct/public sockets remain keyed by the unspoofable peer address.
const proxyIp = xRealIp || (xff ? String(xff).split(",")[0].trim() : "");
const ip = isLoopbackProxy && proxyIp ? proxyIp : socketIp;
delete req.headers["x-9r-real-ip"];
delete req.headers["x-forwarded-for"];
delete req.headers["x-9r-via-proxy"];
delete req.headers["x-9r-peer-token"];
req.headers["x-9r-real-ip"] = i
743B
p;
req.headers["x-9r-peer-token"] = PEER_TOKEN;
if (viaProxy) req.headers["x-9r-via-proxy"] = "1";
return handler(req, res);
};
const server = origCreate(...rest, wrapped);
server.once("listening", () => {
startBackgroundTokenRefreshFromCustomServer();
});
const origEmit = server.emit;
// JBR 25 sends h2c upgrades that the HTTP/1.1 server would otherwise close.
server.emit = function (event, ...eventArgs) {
const [req, socket, head] = eventArgs;
if (event !== "upgrade" || String(req.headers.upgrade || "").toLowerCase() !== "h2c") {
return origEmit.call(this, event, ...eventArgs);
}
const contentLength = Number(req.headers["content-length"] || 0);
if (!Number.isSafeInteger(contentLength) || contentLength < 0) {
socket.destroy();
return true;
}
const chunks = [head];
let received = head.length;
const serve = () => {
// Replay the upgraded request through the existing HTTP/1.1 handler.
const replay = new http.IncomingMessage(socket);
Object.assign(replay, { method: req.method, url: req.url, headers: req.headers, complete: true });
if (received) replay.push(Buffer.concat(chunks, received).subarray(0, contentLength));
replay.push(null);
const res = new http.ServerResponse(replay);
res.shouldKeepAlive = false;
res.assignSocket(socket);
res.once("finish", () => socket.end());
Promise.resolve().then(() => wrapped(replay, res)).catch((error) => {
console.error("Failed to downgrade h2c request", error);
socket.destroy();
});
};
if (received >= contentLength) serve();
else {
socket.on("data", function readBody(chunk) {
chunks.push(chunk);
received += chunk.length;
if (received < contentLength) return;
socket.off("data", readBody);
serve();
});
socket.resume();
}
delete req.headers.upgrade;
delete req.headers["http2-settings"];
req.headers.connection = "close";
return true;
};
return server;
};
if (require.main === module) {
const standalone = path.join(__dirname, "server.js");
if (fs.existsSync(standalone)) {
require(standalone);
} else {
// Repo checkout has no standalone build next to us. `next start` builds its HTTP
// server in-process, so the wrapper above still sanitizes every request.
const nextBin = require.resolve("next/dist/bin/next");
process.argv = [process.argv[0], nextBin, "start", ...process.argv.slice(2)];
require(nextBin);
}
}