diff --git a/README.md b/README.md index 888339e..bdf68f9 100644 --- a/README.md +++ b/README.md @@ -1,6 +1,10 @@ # node-telnet-client [![Node.js CI](https://github.com/Hammer1279/node-telnet-client/actions/workflows/pkg.yml/badge.svg)](https://github.com/Hammer1279/node-telnet-client/actions/workflows/pkg.yml) -To be used with HTDev BBS Server for encrypted communication and extended functionality. +A zero dependency NodeJS Implementation of a [RFC-854](https://datatracker.ietf.org/doc/html/rfc854) telnet client. + +This is a very early version that so far isn't very compatible with most major telnet servers yet. + +It is developed for the [HTDev Telnet Server](telnet://ht-dev.de) for encrypted communication and extended functionality. ## Autorun command @@ -15,4 +19,9 @@ For experimental versions, check the pre-releases under releases, for "nightly" It has zero dependencies itself so to run a copy locally, just run it with `node index.js` -To build the application, run `npm install` and then `npm run build`. \ No newline at end of file +To build the application, run `npm install` and then `npm run build`. + +## Build Dependencies + +- @yao-pkg/pkg: Compiling the Application +- protocol-registry: Register the telnet uri as per [RFC-4248](https://datatracker.ietf.org/doc/html/rfc4248) diff --git a/index.js b/index.js index 9440de0..dc93508 100644 --- a/index.js +++ b/index.js @@ -1,3 +1,5 @@ +// rework to use chunkermaster + const fs = require("fs"); const path = require("path"); const { createConnection } = require('net'); @@ -12,6 +14,7 @@ const encryptionDelay = 200; // additional delay for encryption const initializationDelay = 500; // additional delay for initialization const advancedFeatures = true; // Enable advanced features +const printIO = false; // Print input/output data class MemoryStream extends Transform { constructor(options = {}) { @@ -24,8 +27,46 @@ class MemoryStream extends Transform { } } +/** + * prepare the session and close handler when done + * @param {Buffer} data + * @returns {Buffer[]} chunks + */ +function chunkData(data) { + // Split data into chunks based on IAC + const chunks = []; + let currentChunk = Buffer.alloc(0); + + for (let i = 0; i < data.length; i++) { + if (data[i] === IAC[0]) { + if (currentChunk.length > 0) { + chunks.push(currentChunk); + } + // Find the end of the IAC command + let cmdLength = 3; // Default IAC command length + if (data[i + 1] === SB[0]) { + // Find SE to end subnegotiation + const seIndex = data.indexOf(SE[0], i); + cmdLength = seIndex - i + 1; + } + chunks.push(data.subarray(i, i + cmdLength)); + i += cmdLength - 1; + currentChunk = Buffer.alloc(0); + } else { + currentChunk = Buffer.concat([currentChunk, Buffer.from([data[i]])]); + } + } + + if (currentChunk.length > 0) { + chunks.push(currentChunk); + } + + return chunks; +} + const writer = new MemoryStream(); let initialized = false; // Initialization status, do not modify directly, runtime only +let handoffInit = false; // Handoff initialization status to server, do not modify directly, runtime only let encrypted = false; // Encryption status, do not modify directly, runtime only let privateKey; // Private key, do not modify directly, runtime only let keyCurve; // Key curve, do not modify directly, runtime only @@ -87,6 +128,42 @@ const RESUME = Buffer.from([0x87]); // Resume const START_CONTENT = Buffer.from([0x88]); // Start Content const END_CONTENT = Buffer.from([0x89]); // End Content +// ANSI escape codes for colors +const ANSI = { + // Reset + reset: '\x1b[0m', + + // Basic foreground colors + black: '\x1b[30m', + red: '\x1b[31m', + green: '\x1b[32m', + yellow: '\x1b[33m', + blue: '\x1b[34m', + magenta: '\x1b[35m', + cyan: '\x1b[36m', + white: '\x1b[37m', + + // Bright foreground colors + brightBlack: '\x1b[90m', + brightRed: '\x1b[91m', + brightGreen: '\x1b[92m', + brightYellow: '\x1b[93m', + brightBlue: '\x1b[94m', + brightMagenta: '\x1b[95m', + brightCyan: '\x1b[96m', + brightWhite: '\x1b[97m', + + // Basic background colors + bgBlack: '\x1b[40m', + bgRed: '\x1b[41m', + bgGreen: '\x1b[42m', + bgYellow: '\x1b[43m', + bgBlue: '\x1b[44m', + bgMagenta: '\x1b[45m', + bgCyan: '\x1b[46m', + bgWhite: '\x1b[47m' +}; + // Encrypt function encrypt(plaintext, key = privateKey, encoding = 'utf8') { // Generate a random IV (12 bytes recommended for GCM) @@ -154,7 +231,9 @@ process.stdin.resume(); // format keys before sending to server process.stdin.on('data', async (key) => { if (key === '\u0004') { // Ctrl+D - process.exit(); + socket.end(); // End connection + socket.destroy(); // Destroy socket + process.exit(); // Exit process } else if (key === '\u0003') { // Ctrl+C send(IP); // Interrupt Process } else if (key === '\u0018') { // Ctrl+X @@ -185,6 +264,7 @@ process.stdin.on('data', async (key) => { process.stdout.write("> "); } else if (command == "disconnect") { send(IP); // Interrupt Process + socket.end(); // End connection } else if (command == "status") { console.log("Client status:"); console.log("Host:", hostname + ":" + port); @@ -195,6 +275,8 @@ process.stdin.on('data', async (key) => { // console.log("Public Key:", key.getPublicKey() ? key.getPublicKey().toString("hex") : "null"); // console.log("Private Key:", privateKey ? privateKey.toString("hex") : "null"); process.stdout.write("$ "); + } else if (command == "debug") { + socket.write(Buffer.concat([IAC, DO, STATUS])); // Debug request Status } else if (command == "keyinfo") { console.log("Key Information:"); console.log("Key Curve:", keyCurve); @@ -206,6 +288,7 @@ process.stdin.on('data', async (key) => { // Add any additional functionality for client side commands console.log("Client commands:"); console.log("status - Show client status"); + console.log("debug - [DEV] Request server status"); console.log("keyinfo - Show key information"); console.log("disconnect - Disconnect from server"); console.log("exit - Exit client command mode"); @@ -217,67 +300,86 @@ process.stdin.on('data', async (key) => { }); socket.on("data", (data) => { - if (!encrypted || !initialized) { - if (data.equals(PAUSE)) { - process.stdin.pause(); - } else if (data.equals(RESUME)) { - process.stdin.resume(); - } else if (data.equals(IP)) { - process.exit(); - } else if (data.includes(Buffer.concat([IAC, SB, CUSTOM_CLIENT_INIT, NUL]))) { - const offsetBegin = data.indexOf(SB) + 2; - const offsetEnd = data.lastIndexOf(SE) - 1; - const algorithmData = data.subarray(offsetBegin + 1, offsetEnd); - keyCurve = algorithmData.toString('utf8'); - echdKey = createECDH(keyCurve); - console.debug("Using key curve:", keyCurve); - } else if (data.equals(Buffer.concat([IAC, DO, CUSTOM_CLIENT_INIT]))) { - // server supports custom client features - socket.write(Buffer.concat([IAC, WILL, KEY_EXCHANGE])); // Start Key Exchange - } else if (data.includes(Buffer.concat([IAC, DO, KEY_EXCHANGE]))) { - // generate keys - const publicKey = echdKey.generateKeys(); - console.debug("Generated Key: " + publicKey.toString("hex")); - } else if (data.equals(Buffer.concat([IAC, SB, KEY_EXCHANGE, ONE /* value required */, IAC, SE]))) { - socket.write(Buffer.concat([IAC, SB, KEY_EXCHANGE, NUL, echdKey.getPublicKey(), IAC, SE])); - // send key to server - } else if (data.includes(Buffer.concat([IAC, SB, KEY_EXCHANGE, NUL /* value provided */]))) { - // server sent its key, generate secret - console.debug("Key exchange received"); - const offsetBegin = data.indexOf(SB) + 2; - const offsetEnd = data.lastIndexOf(SE) - 1; - const keyData = data.subarray(offsetBegin + 1, offsetEnd); // client public key - console.log("Extracted key:", keyData.toString("hex")); - privateKey = echdKey.computeSecret(keyData); - socket.write(Buffer.concat([IAC, WILL, ENCRYPTION])); // Enable Encryption - } else if (data.includes(Buffer.concat([IAC, SB, ENCRYPTION, NUL]))) { - const offsetBegin = data.indexOf(SB) + 2; - const offsetEnd = data.lastIndexOf(SE) - 1; - const algorithmData = data.subarray(offsetBegin + 1, offsetEnd); - encryptionAlgorithm = algorithmData.toString('utf8'); - console.debug("Using encryption algorithm:", encryptionAlgorithm); - } else if (data.equals(Buffer.concat([IAC, DO, ENCRYPTION]))) { - // enable encryption - encrypted = true; - console.debug("Encryption enabled"); - console.debug("Private Key: " + privateKey.toString("hex")); - } else if (!hold) { - process.stdout.write(data); - } else { - // console.debug("Data on hold"); - holdBuffer += data.toString(); + const chunks = chunkData(data); + for (const chunk of chunks) { + if (printIO) { + console.debug("Received chunk:", chunk.toString("hex")); } - } else { - // decrypt data - try { - const decryptedData = decrypt(data, privateKey); - process.stdout.write(decryptedData); - } catch (error) { - console.error("Decryption error:", error); - console.error("Data:", data.toString("hex")); - console.debug("Algorithm:", encryptionAlgorithm); - console.debug("Private Key:", privateKey.toString("hex")); - console.debug("Public Key:", echdKey.getPublicKey().toString("hex")); + if (!encrypted || !initialized) { + if (chunk.equals(PAUSE)) { + process.stdin.pause(); + } else if (chunk.equals(RESUME)) { + process.stdin.resume(); + } else if (chunk.equals(IP)) { + process.exit(); + } else if (chunk.includes(Buffer.concat([IAC, SB, CUSTOM_CLIENT_INIT, NUL]))) { + const offsetBegin = chunk.indexOf(SB) + 2; + const offsetEnd = chunk.lastIndexOf(SE) - 1; + const algorithmData = chunk.subarray(offsetBegin + 1, offsetEnd); + keyCurve = algorithmData.toString('utf8'); + echdKey = createECDH(keyCurve); + console.debug("Using key curve:", keyCurve); + } else if (chunk.equals(Buffer.concat([IAC, DO, CUSTOM_CLIENT_INIT]))) { + // server supports custom client features + socket.write(Buffer.concat([IAC, WILL, KEY_EXCHANGE])); // Start Key Exchange + } else if (chunk.includes(Buffer.concat([IAC, DO, KEY_EXCHANGE]))) { + // generate keys + const publicKey = echdKey.generateKeys(); + console.debug("Generated Key: " + publicKey.toString("hex")); + } else if (chunk.equals(Buffer.concat([IAC, SB, KEY_EXCHANGE, ONE /* value required */, IAC, SE]))) { + socket.write(Buffer.concat([IAC, SB, KEY_EXCHANGE, NUL, echdKey.getPublicKey(), IAC, SE])); + // send key to server + } else if (chunk.includes(Buffer.concat([IAC, SB, KEY_EXCHANGE, NUL /* value provided */]))) { + // server sent its key, generate secret + console.debug("Key exchange received"); + const offsetBegin = chunk.indexOf(SB) + 2; + const offsetEnd = chunk.lastIndexOf(SE) - 1; + const keyData = chunk.subarray(offsetBegin + 1, offsetEnd); // client public key + console.log("Extracted key:", keyData.toString("hex")); + privateKey = echdKey.computeSecret(keyData); + socket.write(Buffer.concat([IAC, WILL, ENCRYPTION])); // Enable Encryption + } else if (chunk.includes(Buffer.concat([IAC, SB, STATUS, NUL /* value provided */]))) { + // server sent status + const offsetBegin = chunk.indexOf(SB) + 2; + const offsetEnd = chunk.lastIndexOf(SE) - 1; + const statusData = chunk.subarray(offsetBegin + 1, offsetEnd); + console.debug("Server status:", require("util").inspect(JSON.parse(statusData.toString('utf8')))); + } else if (chunk.includes(Buffer.concat([IAC, SB, ENCRYPTION, NUL]))) { + const offsetBegin = chunk.indexOf(SB) + 2; + const offsetEnd = chunk.lastIndexOf(SE) - 1; + const algorithmData = chunk.subarray(offsetBegin + 1, offsetEnd); + encryptionAlgorithm = algorithmData.toString('utf8'); + console.debug("Using encryption algorithm:", encryptionAlgorithm); + } else if (chunk.equals(Buffer.concat([IAC, DO, ENCRYPTION]))) { + // enable encryption + encrypted = true; + console.debug("Encryption enabled"); + console.debug("Private Key: " + privateKey.toString("hex")); + } else if (chunk.equals(Buffer.concat([IAC, DO, Buffer.from([0x80])]))) { + handoffInit = true; + console.debug("Handoff initialization complete"); + } else if (chunk.equals(Buffer.concat([IAC, DO, Buffer.from([0x80])]))) { // Initialize + socket.write(Buffer.concat([IAC, WILL, Buffer.from([0x80])])); + initialized = true; + console.debug("Initialization complete"); + } else if (!hold) { + process.stdout.write(chunk); + } else { + // console.debug("Data on hold"); + holdBuffer += chunk.toString(); + } + } else { + // decrypt data + try { + const decryptedData = decrypt(chunk, privateKey); + process.stdout.write(decryptedData); + } catch (error) { + console.error("Decryption error:", error); + console.error("Data:", chunk.toString("hex")); + console.debug("Algorithm:", encryptionAlgorithm); + console.debug("Private Key:", privateKey.toString("hex")); + console.debug("Public Key:", echdKey.getPublicKey().toString("hex")); + } } } }); @@ -301,7 +403,7 @@ socket.on("connect", async () => { await delay(delayMs); // Wait for server to process socket.write(Buffer.concat([IAC, WILL, TERMINAL_TYPE, IAC, SB, TERMINAL_TYPE, NUL, Buffer.from("xterm-256color"), IAC, SE])); // Terminal Type await delay(delayMs); - socket.write(Buffer.concat([IAC, DO, ECHO])); // Echo + socket.write(Buffer.concat([IAC, DO, ECHO])); // Tell server to echo input await delay(delayMs); if (advancedFeatures) { socket.write(Buffer.concat([IAC, WILL, CUSTOM_CLIENT_INIT])); // Custom Client Initialization @@ -313,14 +415,19 @@ socket.on("connect", async () => { } await delay(initializationDelay); // Wait for server to process await send(""); // Send empty command to initialize connection - initialized = true; - console.debug("Initialization complete"); + + if (!handoffInit) { + initialized = true; // Initialization is now handled by server + console.debug("Initialization complete"); + } + // socket.write(Buffer.from([0x0d, 0x0a])); // Line Feed // from here on encryption is enabled, do not use socket.write() directly anymore // initialization complete await send("help"); await delay(delayMs); + process.stdout.write("\r" + ANSI.bgRed + ANSI.white + "DEPRECATION NOTICE:" + ANSI.reset + " This is an unsupported version and might not work fully." + "\r\n"); process.stdout.write("\rCtrl+X for client side commands\r\nCtrl+C to exit, Ctrl+D to force close\r\n> "); process.stdin.resume(); // Resume input // more commands can be added here @@ -344,6 +451,28 @@ socket.on("end", () => { process.exit(); }); +process.on('uncaughtException', (err) => { + if (err.code === 'ECONNRESET') { + console.warn("\nDisconnected from server"); + process.exit(); + } else if (err.code === 'ECONNREFUSED') { + console.warn("Connection refused"); + process.exit(); + } else if (err.code === 'ETIMEDOUT') { + console.warn("Connection timed out"); + process.exit(); + } else if (err.code === 'EHOSTUNREACH') { + console.warn("Host is unreachable"); + process.exit(); + } else if (err.code === 'ENETUNREACH') { + console.warn("Network is unreachable"); + process.exit(); + } else { + console.error('Unhandled exception:', err); + process.exit(1); + } +}); + module.exports = { delay, send, diff --git a/package-lock.json b/package-lock.json index 788020b..9728eaa 100644 --- a/package-lock.json +++ b/package-lock.json @@ -1,12 +1,12 @@ { "name": "telnet-client", - "version": "0.0.2", + "version": "0.0.2-dev", "lockfileVersion": 3, "requires": true, "packages": { "": { "name": "telnet-client", - "version": "0.0.2", + "version": "0.0.2-dev", "license": "MIT", "dependencies": { "telnet-client": "file:" @@ -15,7 +15,8 @@ "telnet-client": "index.js" }, "devDependencies": { - "@yao-pkg/pkg": "^5.12.1" + "@yao-pkg/pkg": "^5.12.1", + "protocol-registry": "^1.6.0" } }, "node_modules/@babel/generator": { @@ -85,6 +86,23 @@ "node": ">=6.9.0" } }, + "node_modules/@hapi/hoek": { + "version": "9.3.0", + "resolved": "https://registry.npmjs.org/@hapi/hoek/-/hoek-9.3.0.tgz", + "integrity": "sha512-/c6rf4UJlmHlC9b5BaNvzAcFv7HZ2QHaV0D4/HNlBdvFnvQq8RI4kYdhyPCl7Xj+oWvTWQ8ujhqS53LIgAe6KQ==", + "dev": true, + "license": "BSD-3-Clause" + }, + "node_modules/@hapi/topo": { + "version": "5.1.0", + "resolved": "https://registry.npmjs.org/@hapi/topo/-/topo-5.1.0.tgz", + "integrity": "sha512-foQZKJig7Ob0BMAYBfcJk8d77QtOe7Wo4ox7ff1lQYoNNAb6jwcY1ncdoy2e9wQZzvNy7ODZCYJkK8kzmcAnAg==", + "dev": true, + "license": "BSD-3-Clause", + "dependencies": { + "@hapi/hoek": "^9.0.0" + } + }, "node_modules/@jridgewell/gen-mapping": { "version": "0.3.8", "resolved": "https://registry.npmjs.org/@jridgewell/gen-mapping/-/gen-mapping-0.3.8.tgz", @@ -138,6 +156,40 @@ "@jridgewell/sourcemap-codec": "^1.4.14" } }, + "node_modules/@sideway/address": { + "version": "4.1.5", + "resolved": "https://registry.npmjs.org/@sideway/address/-/address-4.1.5.tgz", + "integrity": "sha512-IqO/DUQHUkPeixNQ8n0JA6102hT9CmaljNTPmQ1u8MEhBo/R4Q8eKLN/vGZxuebwOroDB4cbpjheD4+/sKFK4Q==", + "dev": true, + "license": "BSD-3-Clause", + "dependencies": { + "@hapi/hoek": "^9.0.0" + } + }, + "node_modules/@sideway/formula": { + "version": "3.0.1", + "resolved": "https://registry.npmjs.org/@sideway/formula/-/formula-3.0.1.tgz", + "integrity": "sha512-/poHZJJVjx3L+zVD6g9KgHfYnb443oi7wLu/XKojDviHy6HOEOA6z1Trk5aR1dGcmPenJEgb2sK2I80LeS3MIg==", + "dev": true, + "license": "BSD-3-Clause" + }, + "node_modules/@sideway/pinpoint": { + "version": "2.0.0", + "resolved": "https://registry.npmjs.org/@sideway/pinpoint/-/pinpoint-2.0.0.tgz", + "integrity": "sha512-RNiOoTPkptFtSVzQevY/yWtZwf/RxyVnPy/OcA9HBM3MlGDnBEYL5B41H0MTn0Uec8Hi+2qUtTfG2WWZBmMejQ==", + "dev": true, + "license": "BSD-3-Clause" + }, + "node_modules/@xmldom/xmldom": { + "version": "0.8.10", + "resolved": "https://registry.npmjs.org/@xmldom/xmldom/-/xmldom-0.8.10.tgz", + "integrity": "sha512-2WALfTl4xo2SkGCYRt6rDTFfk9R1czmBvUQy12gK2KuRKIpWEhcbbzy8EZXtz/jkRqHX8bFEc6FC1HjX4TUWYw==", + "dev": true, + "license": "MIT", + "engines": { + "node": ">=10.0.0" + } + }, "node_modules/@yao-pkg/pkg": { "version": "5.16.1", "resolved": "https://registry.npmjs.org/@yao-pkg/pkg/-/pkg-5.16.1.tgz", @@ -221,6 +273,20 @@ "url": "https://github.com/chalk/ansi-styles?sponsor=1" } }, + "node_modules/async": { + "version": "3.2.6", + "resolved": "https://registry.npmjs.org/async/-/async-3.2.6.tgz", + "integrity": "sha512-htCUDlxyyCLMgaM3xXg0C0LW2xqfuQ6p05pCEIsXuyQ+a1koYKTuBMzRNwmybfLgvJDMd0r1LTn4+E0Ti6C2AA==", + "dev": true, + "license": "MIT" + }, + "node_modules/balanced-match": { + "version": "1.0.2", + "resolved": "https://registry.npmjs.org/balanced-match/-/balanced-match-1.0.2.tgz", + "integrity": "sha512-3oSeUO0TMV67hN1AmbXsK4yaqU7tjiHlbxRDZOpH0KW9+CeX4bRAaX0Anxt0tx2MrpRpWwQaPwIlISEJhYU5Pw==", + "dev": true, + "license": "MIT" + }, "node_modules/base64-js": { "version": "1.5.1", "resolved": "https://registry.npmjs.org/base64-js/-/base64-js-1.5.1.tgz", @@ -269,6 +335,17 @@ "node": ">= 6" } }, + "node_modules/brace-expansion": { + "version": "1.1.11", + "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.11.tgz", + "integrity": "sha512-iCuPHDFgrHX7H2vEI/5xpz07zSHB00TpugqhmYtVmMO6518mCuRMoOYFldEBl0g187ufozdaHgWKcYFb61qGiA==", + "dev": true, + "license": "MIT", + "dependencies": { + "balanced-match": "^1.0.0", + "concat-map": "0.0.1" + } + }, "node_modules/buffer": { "version": "5.7.1", "resolved": "https://registry.npmjs.org/buffer/-/buffer-5.7.1.tgz", @@ -294,6 +371,23 @@ "ieee754": "^1.1.13" } }, + "node_modules/chalk": { + "version": "4.1.2", + "resolved": "https://registry.npmjs.org/chalk/-/chalk-4.1.2.tgz", + "integrity": "sha512-oKnbhFyRIXpUuez8iBMmyEa4nbj4IOQyuhc/wy9kY7/WVPcwIO9VA668Pu8RkO7+0G76SLROeyw9CpQ061i4mA==", + "dev": true, + "license": "MIT", + "dependencies": { + "ansi-styles": "^4.1.0", + "supports-color": "^7.1.0" + }, + "engines": { + "node": ">=10" + }, + "funding": { + "url": "https://github.com/chalk/chalk?sponsor=1" + } + }, "node_modules/chownr": { "version": "1.1.4", "resolved": "https://registry.npmjs.org/chownr/-/chownr-1.1.4.tgz", @@ -333,6 +427,13 @@ "dev": true, "license": "MIT" }, + "node_modules/concat-map": { + "version": "0.0.1", + "resolved": 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