diff --git a/mcp-server/.env.example b/mcp-server/.env.example new file mode 100644 index 000000000..f4043669d --- /dev/null +++ b/mcp-server/.env.example @@ -0,0 +1,13 @@ +# Telegram Bot API server to call. Point this at your own local +# telegram-bot-api server (e.g. http://localhost:8081) or api.telegram.org. +TELEGRAM_BOT_API_URL=https://api.telegram.org + +# Bot token issued by @BotFather. +TELEGRAM_BOT_TOKEN=123456:ABC-DEF... + +# This node's secret key, generated with `npm run keygen`. Never share this. +MCP_LOCAL_SECRET_KEY= + +# The public key of the single MCP peer this server will exchange encrypted +# messages with, given to you by that peer (their `npm run keygen` output). +MCP_PEER_PUBLIC_KEY= diff --git a/mcp-server/.gitignore b/mcp-server/.gitignore new file mode 100644 index 000000000..deed335be --- /dev/null +++ b/mcp-server/.gitignore @@ -0,0 +1,3 @@ +node_modules/ +dist/ +.env diff --git a/mcp-server/README.md b/mcp-server/README.md new file mode 100644 index 000000000..070cbd3f9 --- /dev/null +++ b/mcp-server/README.md @@ -0,0 +1,107 @@ +# Telegram Bot API MCP Server + +An [MCP](https://modelcontextprotocol.io) server that exposes a subset of the +[Telegram Bot API](https://core.telegram.org/bots/api) (as served by this +repository's `telegram-bot-api` server, or by `api.telegram.org`) as MCP +tools, and communicates with its peer over an **end-to-end encrypted** +transport rather than plain stdio. + +## Why encrypted transport + +MCP normally runs over plain stdio or HTTP/SSE between a client and server +that already trust their local machine's process boundary. Here the two +sides may be different agents/processes that don't share that trust (e.g. +this server's stdio is piped through a relay, container boundary, or network +link you don't fully control). `EncryptedStdioTransport` +(`src/transport/encryptedStdioTransport.ts`) wraps every JSON-RPC message in +a [NaCl `box`](https://nacl.cr.yp.to/box.html) envelope — Curve25519 key +agreement, XSalsa20 encryption, Poly1305 authentication — so only the two +parties holding the matching keypair can read or forge traffic on that pipe, +regardless of what the transport in between is. + +This is peer-to-peer, pre-shared-key encryption: each server instance is +configured with exactly one remote peer's public key and refuses to decrypt +envelopes signed by any other key. + +## Setup + +1. Install dependencies and build: + + ```sh + npm install + npm run build + ``` + +2. Generate a keypair for this node: + + ```sh + npm run keygen + ``` + + This prints an `MCP_LOCAL_SECRET_KEY` (keep private) and an + `MCP_PUBLIC_KEY` (share with your peer). + +3. Exchange public keys with the MCP peer you'll be talking to, out-of-band + (each side runs `npm run keygen` and sends the other its `MCP_PUBLIC_KEY` + line only — never the secret key). + +4. Copy `.env.example` to `.env` and fill in: + - `TELEGRAM_BOT_API_URL` — your `telegram-bot-api` server, or + `https://api.telegram.org`. + - `TELEGRAM_BOT_TOKEN` — your bot's token from @BotFather. + - `MCP_LOCAL_SECRET_KEY` — from step 2. + - `MCP_PEER_PUBLIC_KEY` — the public key your peer gave you in step 3. + +5. Run the server: + + ```sh + npm start + ``` + + It speaks newline-delimited, encrypted JSON-RPC over stdio, so it's + launched by an MCP client the same way any stdio MCP server is — the + client must be configured with the *matching* keypair (its own secret + key, and this server's public key as its peer key) to talk to it. + +## Available tools + +| Tool | Telegram Bot API method | +| --- | --- | +| `telegram_get_me` | `getMe` | +| `telegram_send_message` | `sendMessage` | +| `telegram_get_updates` | `getUpdates` | +| `telegram_get_chat` | `getChat` | +| `telegram_set_webhook` | `setWebhook` | +| `telegram_delete_webhook` | `deleteWebhook` | + +Add more by calling `server.registerTool(...)` in `src/tools/register.ts`; +each tool just forwards to `TelegramClient.call(method, params)`. + +## Design notes + +- `src/crypto/e2ee.ts` — the `E2eeSession` class: precomputes a shared key + via `nacl.box.before`, then seals/opens individual messages with a fresh + random nonce each time. Envelopes carry the sender's public key so the + receiver can verify it matches the configured peer before attempting to + decrypt (constant-time compare), rather than trusting whatever nonce/key + shows up on the wire. +- `src/transport/encryptedStdioTransport.ts` — implements the same + `Transport` shape as the MCP SDK's built-in `StdioServerTransport`, so it + drops into `McpServer.connect()` unchanged; only the wire format differs + (JSON envelope instead of raw JSON-RPC). +- `src/telegramClient.ts` — plain HTTP client for the Bot API. Deliberately + not part of the E2E layer: the bot token's secrecy is the server operator's + responsibility (env var / secret store), while the E2E layer protects the + *MCP conversation* about what calls to make. + +## Security notes + +- This scheme provides confidentiality and authenticity between two parties + who have already exchanged public keys through a trusted channel. It does + **not** perform any additional identity verification (no CA, no + out-of-band fingerprint check) — verify the public key you receive really + came from your intended peer. +- There is no forward secrecy: keys are static and long-lived. Rotate them + (re-run `npm run keygen`, re-exchange, update env vars) periodically or if + either secret key may have been exposed. +- Never commit `.env` or a real `MCP_LOCAL_SECRET_KEY` to version control. diff --git a/mcp-server/package-lock.json b/mcp-server/package-lock.json new file mode 100644 index 000000000..087b8cc78 --- /dev/null +++ b/mcp-server/package-lock.json @@ -0,0 +1,1228 @@ +{ + "name": "telegram-bot-api-mcp-server", + "version": "0.1.0", + "lockfileVersion": 3, + "requires": true, + "packages": { + "": { + "name": "telegram-bot-api-mcp-server", + "version": "0.1.0", + "dependencies": { + "@modelcontextprotocol/sdk": "^1.12.0", + "tweetnacl": "^1.0.3", + "zod": "^3.23.8" + }, + "bin": { + "telegram-bot-api-mcp-keygen": "dist/keygen.js", + "telegram-bot-api-mcp-server": "dist/server.js" + }, + "devDependencies": { + "@types/node": "^22.10.2", + "typescript": "^5.7.2" + }, + "engines": { + "node": ">=18" + } + }, + "node_modules/@hono/node-server": { + "version": 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"@types/node": "^22.10.2", + "typescript": "^5.7.2" + }, + "engines": { + "node": ">=18" + } +} diff --git a/mcp-server/src/config.ts b/mcp-server/src/config.ts new file mode 100644 index 000000000..678f21c13 --- /dev/null +++ b/mcp-server/src/config.ts @@ -0,0 +1,29 @@ +import { decodeBase64 } from "./crypto/e2ee.js"; + +export interface Config { + telegramBaseUrl: string; + telegramToken: string; + localSecretKey: Uint8Array; + peerPublicKey: Uint8Array; +} + +function requireEnv(name: string): string { + const value = process.env[name]; + if (!value) { + throw new Error( + `Missing required environment variable ${name}. Run "npm run keygen" to generate a keypair, ` + + `exchange public keys with your MCP peer out-of-band, and set the required env vars ` + + `(see mcp-server/README.md).`, + ); + } + return value; +} + +export function loadConfig(): Config { + return { + telegramBaseUrl: process.env.TELEGRAM_BOT_API_URL ?? "https://api.telegram.org", + telegramToken: requireEnv("TELEGRAM_BOT_TOKEN"), + localSecretKey: decodeBase64(requireEnv("MCP_LOCAL_SECRET_KEY")), + peerPublicKey: decodeBase64(requireEnv("MCP_PEER_PUBLIC_KEY")), + }; +} diff --git a/mcp-server/src/crypto/e2ee.ts b/mcp-server/src/crypto/e2ee.ts new file mode 100644 index 000000000..2333a0ae0 --- /dev/null +++ b/mcp-server/src/crypto/e2ee.ts @@ -0,0 +1,111 @@ +// End-to-end encryption for MCP messages exchanged with a remote peer. +// +// Uses NaCl's authenticated-encryption "box" construction +// (Curve25519 for key agreement, XSalsa20 for the stream cipher, Poly1305 +// for the MAC). Every message is sealed with the sender's static secret key +// and the recipient's static public key plus a fresh random nonce, so +// messages are both confidential and authenticated as coming from the +// holder of the peer's secret key. Keys are exchanged out-of-band (see +// keygen.ts / README.md) — this module never transmits a secret key. +import nacl from "tweetnacl"; + +export interface KeyPair { + publicKey: Uint8Array; + secretKey: Uint8Array; +} + +export interface EncryptedEnvelope { + /** Protocol version, so future changes can be detected instead of silently misparsed. */ + v: 1; + /** Base64-encoded sender public key, so the recipient can identify/authenticate the peer. */ + senderPublicKey: string; + /** Base64-encoded 24-byte nonce. */ + nonce: string; + /** Base64-encoded ciphertext. */ + ciphertext: string; +} + +export function generateKeyPair(): KeyPair { + const kp = nacl.box.keyPair(); + return { publicKey: kp.publicKey, secretKey: kp.secretKey }; +} + +export function keyPairFromSecretKey(secretKey: Uint8Array): KeyPair { + const kp = nacl.box.keyPair.fromSecretKey(secretKey); + return { publicKey: kp.publicKey, secretKey: kp.secretKey }; +} + +export function encodeBase64(bytes: Uint8Array): string { + return Buffer.from(bytes).toString("base64"); +} + +export function decodeBase64(b64: string): Uint8Array { + return new Uint8Array(Buffer.from(b64, "base64")); +} + +/** + * A session bound to exactly one remote peer's public key. The shared secret + * is precomputed once (nacl.box.before) rather than re-derived per message. + */ +export class E2eeSession { + private readonly sharedKey: Uint8Array; + + constructor( + private readonly localKeyPair: KeyPair, + private readonly remotePublicKey: Uint8Array, + ) { + if (remotePublicKey.length !== nacl.box.publicKeyLength) { + throw new Error("Invalid remote public key length"); + } + this.sharedKey = nacl.box.before(remotePublicKey, localKeyPair.secretKey); + } + + seal(plaintext: unknown): EncryptedEnvelope { + const nonce = nacl.randomBytes(nacl.box.nonceLength); + const message = Buffer.from(JSON.stringify(plaintext), "utf8"); + const ciphertext = nacl.box.after(message, nonce, this.sharedKey); + return { + v: 1, + senderPublicKey: encodeBase64(this.localKeyPair.publicKey), + nonce: encodeBase64(nonce), + ciphertext: encodeBase64(ciphertext), + }; + } + + open(envelope: EncryptedEnvelope): unknown { + if (envelope.v !== 1) { + throw new Error(`Unsupported envelope version: ${String((envelope as { v: unknown }).v)}`); + } + const senderPublicKey = decodeBase64(envelope.senderPublicKey); + if (!constantTimeEqual(senderPublicKey, this.remotePublicKey)) { + throw new Error("Envelope sender public key does not match the configured peer; refusing to decrypt"); + } + const nonce = decodeBase64(envelope.nonce); + const ciphertext = decodeBase64(envelope.ciphertext); + const plaintext = nacl.box.open.after(ciphertext, nonce, this.sharedKey); + if (plaintext === null) { + throw new Error("Failed to authenticate/decrypt message: it was tampered with, corrupted, or sealed by the wrong key"); + } + return JSON.parse(Buffer.from(plaintext).toString("utf8")); + } +} + +function constantTimeEqual(a: Uint8Array, b: Uint8Array): boolean { + if (a.length !== b.length) return false; + let diff = 0; + for (let i = 0; i < a.length; i++) { + diff |= a[i] ^ b[i]; + } + return diff === 0; +} + +export function isEncryptedEnvelope(value: unknown): value is EncryptedEnvelope { + return ( + typeof value === "object" && + value !== null && + (value as Record).v === 1 && + typeof (value as Record).senderPublicKey === "string" && + typeof (value as Record).nonce === "string" && + typeof (value as Record).ciphertext === "string" + ); +} diff --git a/mcp-server/src/keygen.ts b/mcp-server/src/keygen.ts new file mode 100644 index 000000000..b503d36a0 --- /dev/null +++ b/mcp-server/src/keygen.ts @@ -0,0 +1,13 @@ +#!/usr/bin/env node +// Generates a fresh Curve25519 keypair for use with the encrypted MCP +// transport. The secret key must stay local (set as MCP_LOCAL_SECRET_KEY); +// the public key is safe to share with the peer you intend to talk to, who +// sets it as their MCP_PEER_PUBLIC_KEY (and vice versa). +import { encodeBase64, generateKeyPair } from "./crypto/e2ee.js"; + +const keyPair = generateKeyPair(); + +process.stdout.write("Generated a new Curve25519 keypair for the E2E-encrypted MCP transport.\n\n"); +process.stdout.write(`MCP_LOCAL_SECRET_KEY=${encodeBase64(keyPair.secretKey)}\n`); +process.stdout.write(`# Share only the line below with your peer, who sets it as MCP_PEER_PUBLIC_KEY:\n`); +process.stdout.write(`MCP_PUBLIC_KEY=${encodeBase64(keyPair.publicKey)}\n`); diff --git a/mcp-server/src/server.ts b/mcp-server/src/server.ts new file mode 100644 index 000000000..60072ace2 --- /dev/null +++ b/mcp-server/src/server.ts @@ -0,0 +1,37 @@ +#!/usr/bin/env node +import { McpServer } from "@modelcontextprotocol/sdk/server/mcp.js"; +import { loadConfig } from "./config.js"; +import { E2eeSession, keyPairFromSecretKey } from "./crypto/e2ee.js"; +import { EncryptedStdioTransport } from "./transport/encryptedStdioTransport.js"; +import { TelegramClient } from "./telegramClient.js"; +import { registerTelegramTools } from "./tools/register.js"; + +async function main(): Promise { + const config = loadConfig(); + + const localKeyPair = keyPairFromSecretKey(config.localSecretKey); + const session = new E2eeSession(localKeyPair, config.peerPublicKey); + + const telegram = new TelegramClient({ + baseUrl: config.telegramBaseUrl, + token: config.telegramToken, + }); + + const server = new McpServer({ + name: "telegram-bot-api-mcp-server", + version: "0.1.0", + }); + registerTelegramTools(server, telegram); + + const transport = new EncryptedStdioTransport(session); + // McpServer.connect() accepts anything satisfying the SDK's Transport + // interface, which EncryptedStdioTransport implements structurally. + await server.connect(transport as unknown as Parameters[0]); + + process.stderr.write("telegram-bot-api-mcp-server: ready (end-to-end encrypted stdio transport)\n"); +} + +main().catch((err) => { + process.stderr.write(`telegram-bot-api-mcp-server: fatal error: ${err instanceof Error ? err.stack ?? err.message : String(err)}\n`); + process.exit(1); +}); diff --git a/mcp-server/src/telegramClient.ts b/mcp-server/src/telegramClient.ts new file mode 100644 index 000000000..0e9a20de6 --- /dev/null +++ b/mcp-server/src/telegramClient.ts @@ -0,0 +1,59 @@ +// Thin wrapper around a running Telegram Bot API server (this repository's +// C++ server, or https://api.telegram.org) so MCP tools can call bot +// methods over plain HTTP. This is deliberately separate from the MCP +// transport encryption: the bot token already grants full control of the +// bot, so this client is expected to talk to a server on localhost or over +// TLS, while the E2eeSession protects the MCP conversation with the other +// agent asking us to make these calls. +export interface TelegramClientOptions { + /** Base URL of the Bot API server, e.g. "http://localhost:8081" or "https://api.telegram.org". */ + baseUrl: string; + /** Bot token, as issued by @BotFather. */ + token: string; +} + +export class TelegramApiError extends Error { + constructor( + public readonly method: string, + public readonly errorCode: number | undefined, + description: string, + ) { + super(`Telegram Bot API method "${method}" failed${errorCode ? ` (${errorCode})` : ""}: ${description}`); + } +} + +export class TelegramClient { + private readonly baseUrl: string; + private readonly token: string; + + constructor(options: TelegramClientOptions) { + this.baseUrl = options.baseUrl.replace(/\/+$/, ""); + this.token = options.token; + } + + async call(method: string, params: Record = {}): Promise { + const url = `${this.baseUrl}/bot${this.token}/${method}`; + const body: Record = {}; + for (const [key, value] of Object.entries(params)) { + if (value !== undefined) body[key] = value; + } + + const response = await fetch(url, { + method: "POST", + headers: { "Content-Type": "application/json" }, + body: JSON.stringify(body), + }); + + const payload = (await response.json()) as { + ok: boolean; + result?: T; + error_code?: number; + description?: string; + }; + + if (!payload.ok) { + throw new TelegramApiError(method, payload.error_code, payload.description ?? "unknown error"); + } + return payload.result as T; + } +} diff --git a/mcp-server/src/tools/register.ts b/mcp-server/src/tools/register.ts new file mode 100644 index 000000000..af0bfb1ab --- /dev/null +++ b/mcp-server/src/tools/register.ts @@ -0,0 +1,88 @@ +import { z } from "zod"; +import type { McpServer } from "@modelcontextprotocol/sdk/server/mcp.js"; +import type { TelegramClient } from "../telegramClient.js"; + +/** Registers a focused set of Telegram Bot API methods as MCP tools. */ +export function registerTelegramTools(server: McpServer, telegram: TelegramClient): void { + server.registerTool( + "telegram_get_me", + { + title: "Get bot info", + description: "Fetch basic information about the bot account (getMe).", + inputSchema: {}, + }, + async () => textResult(await telegram.call("getMe")), + ); + + server.registerTool( + "telegram_send_message", + { + title: "Send a Telegram message", + description: "Send a text message to a chat (sendMessage).", + inputSchema: { + chat_id: z.union([z.string(), z.number()]).describe("Target chat id or @username"), + text: z.string().describe("Message text"), + parse_mode: z.enum(["MarkdownV2", "HTML", "Markdown"]).optional(), + reply_to_message_id: z.number().int().optional(), + }, + }, + async (args) => textResult(await telegram.call("sendMessage", args)), + ); + + server.registerTool( + "telegram_get_updates", + { + title: "Get updates", + description: "Poll for new updates sent to the bot (getUpdates).", + inputSchema: { + offset: z.number().int().optional(), + limit: z.number().int().min(1).max(100).optional(), + timeout: z.number().int().min(0).optional(), + }, + }, + async (args) => textResult(await telegram.call("getUpdates", args)), + ); + + server.registerTool( + "telegram_get_chat", + { + title: "Get chat", + description: "Fetch up to date information about a chat (getChat).", + inputSchema: { + chat_id: z.union([z.string(), z.number()]), + }, + }, + async (args) => textResult(await telegram.call("getChat", args)), + ); + + server.registerTool( + "telegram_set_webhook", + { + title: "Set webhook", + description: "Register a webhook URL to receive updates (setWebhook).", + inputSchema: { + url: z.string().url(), + secret_token: z.string().optional(), + }, + }, + async (args) => textResult(await telegram.call("setWebhook", args)), + ); + + server.registerTool( + "telegram_delete_webhook", + { + title: "Delete webhook", + description: "Remove the currently configured webhook (deleteWebhook).", + inputSchema: { + drop_pending_updates: z.boolean().optional(), + }, + }, + async (args) => textResult(await telegram.call("deleteWebhook", args)), + ); +} + +function textResult(value: unknown) { + return { + content: [{ type: "text" as const, text: JSON.stringify(value, null, 2) }], + }; +} diff --git a/mcp-server/src/transport/encryptedStdioTransport.ts b/mcp-server/src/transport/encryptedStdioTransport.ts new file mode 100644 index 000000000..d344a9d11 --- /dev/null +++ b/mcp-server/src/transport/encryptedStdioTransport.ts @@ -0,0 +1,75 @@ +// An MCP Transport that speaks newline-delimited JSON over stdio, exactly +// like the SDK's built-in StdioServerTransport, except every JSON-RPC +// message is wrapped in an E2eeSession envelope before it hits the wire and +// unwrapped on the way back in. This lets a Telegram Bot API MCP server +// exchange tool calls/results with a remote MCP peer over a channel that +// isn't itself trusted (e.g. piped through an untrusted relay or proxy), +// because only the two parties holding the matching keypairs can read the +// traffic. +import type { JSONRPCMessage } from "@modelcontextprotocol/sdk/types.js"; +import { createInterface, type Interface } from "node:readline"; +import type { Readable, Writable } from "node:stream"; +import { E2eeSession, isEncryptedEnvelope, type EncryptedEnvelope } from "../crypto/e2ee.js"; + +export interface Transport { + start(): Promise; + send(message: JSONRPCMessage): Promise; + close(): Promise; + onclose?: () => void; + onerror?: (error: Error) => void; + onmessage?: (message: JSONRPCMessage) => void; +} + +export class EncryptedStdioTransport implements Transport { + private readline?: Interface; + private started = false; + + onclose?: () => void; + onerror?: (error: Error) => void; + onmessage?: (message: JSONRPCMessage) => void; + + constructor( + private readonly session: E2eeSession, + private readonly input: Readable = process.stdin, + private readonly output: Writable = process.stdout, + ) {} + + async start(): Promise { + if (this.started) { + throw new Error("EncryptedStdioTransport already started"); + } + this.started = true; + + this.readline = createInterface({ input: this.input, terminal: false }); + this.readline.on("line", (line) => this.handleLine(line)); + this.readline.on("close", () => this.onclose?.()); + } + + private handleLine(line: string): void { + const trimmed = line.trim(); + if (trimmed.length === 0) return; + + try { + const parsed: unknown = JSON.parse(trimmed); + if (!isEncryptedEnvelope(parsed)) { + throw new Error("Received a plaintext/malformed frame on an end-to-end encrypted transport; refusing to process it"); + } + const message = this.session.open(parsed as EncryptedEnvelope) as JSONRPCMessage; + this.onmessage?.(message); + } catch (err) { + this.onerror?.(err instanceof Error ? err : new Error(String(err))); + } + } + + async send(message: JSONRPCMessage): Promise { + const envelope = this.session.seal(message); + const line = JSON.stringify(envelope); + await new Promise((resolve, reject) => { + this.output.write(line + "\n", (err) => (err ? reject(err) : resolve())); + }); + } + + async close(): Promise { + this.readline?.close(); + } +} diff --git a/mcp-server/tsconfig.json b/mcp-server/tsconfig.json new file mode 100644 index 000000000..651c832e6 --- /dev/null +++ b/mcp-server/tsconfig.json @@ -0,0 +1,16 @@ +{ + "compilerOptions": { + "target": "ES2022", + "module": "NodeNext", + "moduleResolution": "NodeNext", + "outDir": "dist", + "rootDir": "src", + "strict": true, + "esModuleInterop": true, + "skipLibCheck": true, + "resolveJsonModule": true, + "declaration": false, + "sourceMap": false + }, + "include": ["src/**/*.ts"] +}