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HTTPS port and forwards requests to proper host, supports WS", + "main": "ReverseProxy.js", + "scripts": { + "test": "echo \"Error: no test specified\" && exit 1", + "start": "node ./src/Program.js" + }, + "author": "Kaveman", + "license": "ISC", + "dependencies": { + "better-sqlite3": "^12.4.1", + "bindings": "^1.5.0", + "fs": "^0.0.1-security", + "http-proxy": "^1.18.1", + "https": "^1.0.0" + } +} diff --git a/src/Program.js b/src/Program.js new file mode 100644 index 0000000..c14d791 --- /dev/null +++ b/src/Program.js @@ -0,0 +1,23 @@ +'use strict'; + +const ReverseProxy = require("./ReverseProxy"); + +/*/ Test GetPath +[ + "https://localhost/health", + "http://12/health", + "localhost/health", + "ws://websocket/path?key=value", + "ssh://hello:22/" +].forEach(url => { + console.log(`'${url}' => '${ReverseProxy.GetPath(url)}'`) +})//*/ + + +ReverseProxy.Start() +/*/ Test host resolution +.then(instance => { + ["kavemans.dev", "localhost"].forEach(host => { + console.log(`'${host}' => '${instance.TryResolveInternalHost(host)}'`); + }); +});//*/ \ No newline at end of file diff --git a/src/ReverseProxy.js b/src/ReverseProxy.js new file mode 100644 index 0000000..b03cc9f --- /dev/null +++ b/src/ReverseProxy.js @@ -0,0 +1,211 @@ +'use strict'; + +const CreateHttpListener = require("http").createServer; +const CreateHttpsListener = require("https").createServer; +const CreateProxyService = require("http-proxy").createProxyServer; +const { readFileSync, existsSync } = require("fs"); +const { once } = require("node:events"); +const SQLiteConnection = require("better-sqlite3"); + +const IsNullOrUndefined = obj => (obj == null && typeof obj == "undefined"); +const DefaultEnvPath = "./.env"; +class CertificatePairMissingException extends Error {} + +class ReverseProxy { + static Start = (envPath = DefaultEnvPath) => new ReverseProxy().#ctor(envPath); + + async #ctor(envPath = DefaultEnvPath) { + // Open db + this.Data = new SQLiteConnection(`${envPath}/Hosts.sqlite3`, { readonly: true }); + let routeCount = this.Data.prepare("SELECT COUNT(*) AS n FROM Hosts").pluck().get(); + console.log(`Database opened with '${routeCount}' routes`); + + // Bind to ports + const bindedProcessReq = this.#ProcessRequest.bind(this); + const httpPort = 80, httpsPort = 443; + try { + this.HttpEndpoint = await this.#CreateHttpEndpoint(httpPort); + this.HttpsEndpoint = await this.#CreateHttpsEndpoint(envPath, httpsPort); + } catch (e) { + console.error("Halting execution due to endpoint creation failure", e); + this.HttpEndpoint?.close(); + this.HttpsEndpoint?.close(); + return; + } + + // Next up, create proxy service to reverse proxy + this.ProxyService = CreateProxyService(); + + // Subscribe to events + this.HttpEndpoint.on("upgrade", this.#HandleWebSocketUpgrade.bind(this)); + this.HttpsEndpoint.on("upgrade", this.#HandleWebSocketUpgrade.bind(this)); + // This is for logging proxy results + this.ProxyService.on("proxyRes", (proxyResponse, request, response) => { + // Check if there is an auth/access error + let internalStatus = response.statusCode; + if (response.statusCode == 511) { + if (IsNullOrUndefined(request.bailHandler)) { + response.writeHead(404, { "Content-Type": "text/plain" }); + response.end(`You do not have the permissions to access '${host}', it's endpoint does not exist or the origin may be down`); + console.log(`[${internalStatus} as 404] ${request.method} ${hostname ?? request.headers?.host}${request.url}`); + proxyResponse.destroy(); + return; + } + return request.bailHandler(internalStatus); + } + // Else let the response go through + console.log(`[${proxyResponse.statusCode}] ${request.method} '${request.headers?.host ?? ''}${request.url}'`); + }); + + // Start listening + // except we already started listening when initializing the http/s endpoints + return this; + } + + async #CreateHttpEndpoint(port = 80, { cancellationToken } = {}) { + let endpoint = CreateHttpListener(this.#ProcessRequest.bind(this)); + const raceConditions = [ + once(endpoint, "listening"), + once(endpoint, "error").then(([err]) => Promise.reject(err)), + cancellationToken + ]; + endpoint.listen(port); + + try { + await Promise.race(raceConditions + // Make sure to filter conditions to make sure they implement ".then" + .filter(x => x != null && typeof x.then === "function")); + } catch (err) { + try { endpoint.close(); } catch { /* ignore */ } + throw err; + } + + console.log(`HTTP endpoint listening on port '${port}'`); + return endpoint; + } + + async #CreateHttpsEndpoint(envPath = DefaultEnvPath, port = 443, { cancellationToken } = {}) { + const keyPath = `${envPath}/private.key`, + certPath = `${envPath}/public.crt`; + if (!existsSync(keyPath)) + throw new CertificatePairMissingException(`Missing private key file at '${keyPath}'`); + if (!existsSync(certPath)) + throw new CertificatePairMissingException(`Missing certificate file at '${certPath}'`); + + let endpoint = CreateHttpsListener({ + key: readFileSync(keyPath), + cert: readFileSync(certPath) + }, this.#ProcessRequest.bind(this)); + + // Subscribing to these events once before calling .listen + // to make sure they get called, even though they should be + // technically called in the next tick + const raceConditions = [ + once(endpoint, "listening"), + once(endpoint, "error").then(([err]) => Promise.reject(err)), + cancellationToken + ]; + + endpoint.listen(port); + + try { + await Promise.race(raceConditions + // Make sure to filter conditions to make sure they implement ".then" + .filter(x => x != null && typeof x.then === "function")); + } catch (err) { + try { endpoint.close(); } catch { /* ignore */ } + throw err; + } + + console.log(`HTTPS endpoint listening on port '${port}'`); + return endpoint; + } + + static IsInternalAddress(addr = "") { + addr = addr.toLowerCase(); + if (addr === "127.0.0.1" || addr === "::1") return true; + if (addr.startsWith("::ffff:")) { + const v4 = addr.slice(7); // e.g. "::ffff:127.0.0.1" -> "127.0.0.1" + return v4.startsWith("127.") + || v4.startsWith("172."); // Docker + } + return false; + } + + static GetPath(urlStr = "") { + // Pattern + // http[s]://[hostname]/1/2/3[?test] + // Remove '://' + urlStr = urlStr.trim(); + //urlStr = urlStr.substring(urlStr.indexOf("://") + 3); + let protocolSeperatorIndex = urlStr.indexOf("://"); + protocolSeperatorIndex = protocolSeperatorIndex == -1 ? 0 :protocolSeperatorIndex + 3; + let pathStartIndex = Math.max(urlStr.indexOf('/', protocolSeperatorIndex), 0), + queryStartIndex = urlStr.indexOf('?'); + if (queryStartIndex < 0) queryStartIndex = urlStr.length; + + return urlStr.substring(pathStartIndex, queryStartIndex); + } + + #ProcessRequest(request, response) { + if (ReverseProxy.IsInternalAddress(request.socket.remoteAddress)) { + switch (ReverseProxy.GetPath(request.url)) { + case "/ready": + response.writeHead(200, { "Content-Type": "text/plain" }); + response.end("200 Good to go!"); + return; + case "/health": + response.writeHead(200, { "Content-Type": "text/plain" }); + response.end("200 I'm still alive!"); + return; + } + } + // Regular + const { host } = request.headers; + const resolvedHost = this.TryResolveInternalHost(host); + const { hostname } = new URL(resolvedHost); + const _bail = (internalStatus = 404) => { + response.writeHead(404, { "Content-Type": "text/plain" }); + response.end(`You do not have the permissions to access '${host}', it's endpoint does not exist or the origin may be down`); + console.log(`[${internalStatus} as 404] ${request.method} ${hostname ?? request.headers?.host}${request.url}`); + }; + if (IsNullOrUndefined(resolvedHost)) + return _bail(404); + try { + request.headers.host = hostname; + this.ProxyService.web(request, response, { target: resolvedHost, xfwd: true }, proxyException => { + return _bail(502); // Bad Gateway: Error related to proxying + }); + } catch (proxyError) { return _bail(500); } + } + + #HandleWebSocketUpgrade(request, socket, head) { + const { host } = request.headers; + const resolvedHost = this.TryResolveInternalHost(host); + const { hostname } = new URL(resolvedHost); + const _bail = (internalStatus = 404) => { + console.log(`[${internalStatus} as 404] ${request.method}=>WS ${req.headers?.host ?? ''}${req.url}`); + socket.write(`HTTP/1.1 404 Not Found\r\nYou do not have the permissions to access '${host}', it's endpoint does not exist or the origin may be down\r\n`); + socket.destroy(); + }; + if (IsNullOrUndefined(resolvedHost)) + return _bail(404); + try { + request.headers.host = hostname; + this.ProxyService.ws(Request, socket, head, { target: resolvedHost, xfwd: true }, proxyException => { + return _bail(502); + }); + } catch (proxyError) { return _bail(500); } + } + + TryResolveInternalHost(publicHost = "") { + const command = this.Data.prepare(`SELECT Target FROM Hosts + WHERE Domain = ? OR Domain = '*' + ORDER BY CASE WHEN Domain = '*' THEN 1 ELSE 0 END + LIMIT 1 + ;`).pluck(); + let reader = command.get(publicHost); + return reader; + } +} +module.exports = ReverseProxy; \ No newline at end of file