diff options
Diffstat (limited to 'services/fxaccounts/FxAccountsPairingChannel.js')
| -rw-r--r-- | services/fxaccounts/FxAccountsPairingChannel.js | 3694 |
1 files changed, 3694 insertions, 0 deletions
diff --git a/services/fxaccounts/FxAccountsPairingChannel.js b/services/fxaccounts/FxAccountsPairingChannel.js new file mode 100644 index 0000000000..0e9597d6fb --- /dev/null +++ b/services/fxaccounts/FxAccountsPairingChannel.js @@ -0,0 +1,3694 @@ +/*! + * + * This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. + * + * The following bundle is from an external repository at github.com/mozilla/fxa-pairing-channel, + * it implements a shared library for two javascript environments to create an encrypted and authenticated + * communication channel by sharing a secret key and by relaying messages through a websocket server. + * + * It is used by the Firefox Accounts pairing flow, with one side of the channel being web + * content from https://accounts.firefox.com and the other side of the channel being chrome native code. + * + * This uses the event-target-shim node library published under the MIT license: + * https://github.com/mysticatea/event-target-shim/blob/master/LICENSE + * + * Bundle generated from https://github.com/mozilla/fxa-pairing-channel.git. Hash:c8ec3119920b4ffa833b, Chunkhash:378a5f51445e7aa7630e. + * + */ + +// This header provides a little bit of plumbing to use `FxAccountsPairingChannel` +// from Firefox browser code, hence the presence of these privileged browser APIs. +// If you're trying to use this from ordinary web content you're in for a bad time. + +const {setTimeout} = ChromeUtils.importESModule("resource://gre/modules/Timer.sys.mjs"); +// We cannot use WebSocket from chrome code without a window, +// see https://bugzilla.mozilla.org/show_bug.cgi?id=784686 +const browser = Services.appShell.createWindowlessBrowser(true); +const {WebSocket} = browser.document.ownerGlobal; + +const EXPORTED_SYMBOLS = ["FxAccountsPairingChannel"]; + +var FxAccountsPairingChannel = +/******/ (function(modules) { // webpackBootstrap +/******/ // The module cache +/******/ var installedModules = {}; +/******/ +/******/ // The require function +/******/ function __webpack_require__(moduleId) { +/******/ +/******/ // Check if module is in cache +/******/ if(installedModules[moduleId]) { +/******/ return installedModules[moduleId].exports; +/******/ } +/******/ // Create a new module (and put it into the cache) +/******/ var module = installedModules[moduleId] = { +/******/ i: moduleId, +/******/ l: false, +/******/ exports: {} +/******/ }; +/******/ +/******/ // Execute the module function +/******/ modules[moduleId].call(module.exports, module, module.exports, __webpack_require__); +/******/ +/******/ // Flag the module as loaded +/******/ module.l = true; +/******/ +/******/ // Return the exports of the module +/******/ return module.exports; +/******/ } +/******/ +/******/ +/******/ // expose the modules object (__webpack_modules__) +/******/ __webpack_require__.m = modules; +/******/ +/******/ // expose the module cache +/******/ __webpack_require__.c = installedModules; +/******/ +/******/ // define getter function for harmony exports +/******/ __webpack_require__.d = function(exports, name, getter) { +/******/ if(!__webpack_require__.o(exports, name)) { +/******/ Object.defineProperty(exports, name, { enumerable: true, get: getter }); +/******/ } +/******/ }; +/******/ +/******/ // define __esModule on exports +/******/ __webpack_require__.r = function(exports) { +/******/ if(typeof Symbol !== 'undefined' && Symbol.toStringTag) { +/******/ Object.defineProperty(exports, Symbol.toStringTag, { value: 'Module' }); +/******/ } +/******/ Object.defineProperty(exports, '__esModule', { value: true }); +/******/ }; +/******/ +/******/ // create a fake namespace object +/******/ // mode & 1: value is a module id, require it +/******/ // mode & 2: merge all properties of value into the ns +/******/ // mode & 4: return value when already ns object +/******/ // mode & 8|1: behave like require +/******/ __webpack_require__.t = function(value, mode) { +/******/ if(mode & 1) value = __webpack_require__(value); +/******/ if(mode & 8) return value; +/******/ if((mode & 4) && typeof value === 'object' && value && value.__esModule) return value; +/******/ var ns = Object.create(null); +/******/ __webpack_require__.r(ns); +/******/ Object.defineProperty(ns, 'default', { enumerable: true, value: value }); +/******/ if(mode & 2 && typeof value != 'string') for(var key in value) __webpack_require__.d(ns, key, function(key) { return value[key]; }.bind(null, key)); +/******/ return ns; +/******/ }; +/******/ +/******/ // getDefaultExport function for compatibility with non-harmony modules +/******/ __webpack_require__.n = function(module) { +/******/ var getter = module && module.__esModule ? +/******/ function getDefault() { return module['default']; } : +/******/ function getModuleExports() { return module; }; +/******/ __webpack_require__.d(getter, 'a', getter); +/******/ return getter; +/******/ }; +/******/ +/******/ // Object.prototype.hasOwnProperty.call +/******/ __webpack_require__.o = function(object, property) { return Object.prototype.hasOwnProperty.call(object, property); }; +/******/ +/******/ // __webpack_public_path__ +/******/ __webpack_require__.p = ""; +/******/ +/******/ +/******/ // Load entry module and return exports +/******/ return __webpack_require__(__webpack_require__.s = 0); +/******/ }) +/************************************************************************/ +/******/ ([ +/* 0 */ +/***/ (function(module, __webpack_exports__, __webpack_require__) { + +"use strict"; +// ESM COMPAT FLAG +__webpack_require__.r(__webpack_exports__); + +// EXPORTS +__webpack_require__.d(__webpack_exports__, "PairingChannel", function() { return /* binding */ src_PairingChannel; }); +__webpack_require__.d(__webpack_exports__, "base64urlToBytes", function() { return /* reexport */ base64urlToBytes; }); +__webpack_require__.d(__webpack_exports__, "bytesToBase64url", function() { return /* reexport */ bytesToBase64url; }); +__webpack_require__.d(__webpack_exports__, "bytesToHex", function() { return /* reexport */ bytesToHex; }); +__webpack_require__.d(__webpack_exports__, "bytesToUtf8", function() { return /* reexport */ bytesToUtf8; }); +__webpack_require__.d(__webpack_exports__, "hexToBytes", function() { return /* reexport */ hexToBytes; }); +__webpack_require__.d(__webpack_exports__, "TLSCloseNotify", function() { return /* reexport */ TLSCloseNotify; }); +__webpack_require__.d(__webpack_exports__, "TLSError", function() { return /* reexport */ TLSError; }); +__webpack_require__.d(__webpack_exports__, "utf8ToBytes", function() { return /* reexport */ utf8ToBytes; }); +__webpack_require__.d(__webpack_exports__, "_internals", function() { return /* binding */ _internals; }); + +// CONCATENATED MODULE: ./src/alerts.js +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +/* eslint-disable sorting/sort-object-props */ +const ALERT_LEVEL = { + WARNING: 1, + FATAL: 2 +}; + +const ALERT_DESCRIPTION = { + CLOSE_NOTIFY: 0, + UNEXPECTED_MESSAGE: 10, + BAD_RECORD_MAC: 20, + RECORD_OVERFLOW: 22, + HANDSHAKE_FAILURE: 40, + ILLEGAL_PARAMETER: 47, + DECODE_ERROR: 50, + DECRYPT_ERROR: 51, + PROTOCOL_VERSION: 70, + INTERNAL_ERROR: 80, + MISSING_EXTENSION: 109, + UNSUPPORTED_EXTENSION: 110, + UNKNOWN_PSK_IDENTITY: 115, + NO_APPLICATION_PROTOCOL: 120, +}; +/* eslint-enable sorting/sort-object-props */ + +function alertTypeToName(type) { + for (const name in ALERT_DESCRIPTION) { + if (ALERT_DESCRIPTION[name] === type) { + return `${name} (${type})`; + } + } + return `UNKNOWN (${type})`; +} + +class TLSAlert extends Error { + constructor(description, level) { + super(`TLS Alert: ${alertTypeToName(description)}`); + this.description = description; + this.level = level; + } + + static fromBytes(bytes) { + if (bytes.byteLength !== 2) { + throw new TLSError(ALERT_DESCRIPTION.DECODE_ERROR); + } + switch (bytes[1]) { + case ALERT_DESCRIPTION.CLOSE_NOTIFY: + if (bytes[0] !== ALERT_LEVEL.WARNING) { + // Close notifications should be fatal. + throw new TLSError(ALERT_DESCRIPTION.ILLEGAL_PARAMETER); + } + return new TLSCloseNotify(); + default: + return new TLSError(bytes[1]); + } + } + + toBytes() { + return new Uint8Array([this.level, this.description]); + } +} + +class TLSCloseNotify extends TLSAlert { + constructor() { + super(ALERT_DESCRIPTION.CLOSE_NOTIFY, ALERT_LEVEL.WARNING); + } +} + +class TLSError extends TLSAlert { + constructor(description = ALERT_DESCRIPTION.INTERNAL_ERROR) { + super(description, ALERT_LEVEL.FATAL); + } +} + +// CONCATENATED MODULE: ./src/utils.js +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + + + +// +// Various low-level utility functions. +// +// These are mostly conveniences for working with Uint8Arrays as +// the primitive "bytes" type. +// + +const UTF8_ENCODER = new TextEncoder(); +const UTF8_DECODER = new TextDecoder(); + +function noop() {} + +function assert(cond, msg) { + if (! cond) { + throw new Error('assert failed: ' + msg); + } +} + +function assertIsBytes(value, msg = 'value must be a Uint8Array') { + // Using `value instanceof Uint8Array` seems to fail in Firefox chrome code + // for inscrutable reasons, so we do a less direct check. + assert(ArrayBuffer.isView(value), msg); + assert(value.BYTES_PER_ELEMENT === 1, msg); + return value; +} + +const EMPTY = new Uint8Array(0); + +function zeros(n) { + return new Uint8Array(n); +} + +function arrayToBytes(value) { + return new Uint8Array(value); +} + +function bytesToHex(bytes) { + return Array.prototype.map.call(bytes, byte => { + let s = byte.toString(16); + if (s.length === 1) { + s = '0' + s; + } + return s; + }).join(''); +} + +function hexToBytes(hexstr) { + assert(hexstr.length % 2 === 0, 'hexstr.length must be even'); + return new Uint8Array(Array.prototype.map.call(hexstr, (c, n) => { + if (n % 2 === 1) { + return hexstr[n - 1] + c; + } else { + return ''; + } + }).filter(s => { + return !! s; + }).map(s => { + return parseInt(s, 16); + })); +} + +function bytesToUtf8(bytes) { + return UTF8_DECODER.decode(bytes); +} + +function utf8ToBytes(str) { + return UTF8_ENCODER.encode(str); +} + +function bytesToBase64url(bytes) { + // XXX TODO: try to use something constant-time, in case calling code + // uses it to encode secrets? + const charCodes = String.fromCharCode.apply(String, bytes); + return btoa(charCodes).replace(/\+/g, '-').replace(/\//g, '_'); +} + +function base64urlToBytes(str) { + // XXX TODO: try to use something constant-time, in case calling code + // uses it to decode secrets? + str = atob(str.replace(/-/g, '+').replace(/_/g, '/')); + const bytes = new Uint8Array(str.length); + for (let i = 0; i < str.length; i++) { + bytes[i] = str.charCodeAt(i); + } + return bytes; +} + +function bytesAreEqual(v1, v2) { + assertIsBytes(v1); + assertIsBytes(v2); + if (v1.length !== v2.length) { + return false; + } + for (let i = 0; i < v1.length; i++) { + if (v1[i] !== v2[i]) { + return false; + } + } + return true; +} + +// The `BufferReader` and `BufferWriter` classes are helpers for dealing with the +// binary struct format that's used for various TLS message. Think of them as a +// buffer with a pointer to the "current position" and a bunch of helper methods +// to read/write structured data and advance said pointer. + +class utils_BufferWithPointer { + constructor(buf) { + this._buffer = buf; + this._dataview = new DataView(buf.buffer, buf.byteOffset, buf.byteLength); + this._pos = 0; + } + + length() { + return this._buffer.byteLength; + } + + tell() { + return this._pos; + } + + seek(pos) { + if (pos < 0) { + throw new TLSError(ALERT_DESCRIPTION.DECODE_ERROR); + } + if (pos > this.length()) { + throw new TLSError(ALERT_DESCRIPTION.DECODE_ERROR); + } + this._pos = pos; + } + + incr(offset) { + this.seek(this._pos + offset); + } +} + +// The `BufferReader` class helps you read structured data from a byte array. +// It offers methods for reading both primitive values, and the variable-length +// vector structures defined in https://tools.ietf.org/html/rfc8446#section-3.4. +// +// Such vectors are represented as a length followed by the concatenated +// bytes of each item, and the size of the length field is determined by +// the maximum allowed number of bytes in the vector. For example +// to read a vector that may contain up to 65535 bytes, use `readVector16`. +// +// To read a variable-length vector of between 1 and 100 uint16 values, +// defined in the RFC like this: +// +// uint16 items<2..200>; +// +// You would do something like this: +// +// const items = [] +// buf.readVector8(buf => { +// items.push(buf.readUint16()) +// }) +// +// The various `read` will throw `DECODE_ERROR` if you attempt to read path +// the end of the buffer, or past the end of a variable-length list. +// +class utils_BufferReader extends utils_BufferWithPointer { + + hasMoreBytes() { + return this.tell() < this.length(); + } + + readBytes(length) { + // This avoids copies by returning a view onto the existing buffer. + const start = this._buffer.byteOffset + this.tell(); + this.incr(length); + return new Uint8Array(this._buffer.buffer, start, length); + } + + _rangeErrorToAlert(cb) { + try { + return cb(this); + } catch (err) { + if (err instanceof RangeError) { + throw new TLSError(ALERT_DESCRIPTION.DECODE_ERROR); + } + throw err; + } + } + + readUint8() { + return this._rangeErrorToAlert(() => { + const n = this._dataview.getUint8(this._pos); + this.incr(1); + return n; + }); + } + + readUint16() { + return this._rangeErrorToAlert(() => { + const n = this._dataview.getUint16(this._pos); + this.incr(2); + return n; + }); + } + + readUint24() { + return this._rangeErrorToAlert(() => { + let n = this._dataview.getUint16(this._pos); + n = (n << 8) | this._dataview.getUint8(this._pos + 2); + this.incr(3); + return n; + }); + } + + readUint32() { + return this._rangeErrorToAlert(() => { + const n = this._dataview.getUint32(this._pos); + this.incr(4); + return n; + }); + } + + _readVector(length, cb) { + const contentsBuf = new utils_BufferReader(this.readBytes(length)); + const expectedEnd = this.tell(); + // Keep calling the callback until we've consumed the expected number of bytes. + let n = 0; + while (contentsBuf.hasMoreBytes()) { + const prevPos = contentsBuf.tell(); + cb(contentsBuf, n); + // Check that the callback made forward progress, otherwise we'll infinite loop. + if (contentsBuf.tell() <= prevPos) { + throw new TLSError(ALERT_DESCRIPTION.DECODE_ERROR); + } + n += 1; + } + // Check that the callback correctly consumed the vector's entire contents. + if (this.tell() !== expectedEnd) { + throw new TLSError(ALERT_DESCRIPTION.DECODE_ERROR); + } + } + + readVector8(cb) { + const length = this.readUint8(); + return this._readVector(length, cb); + } + + readVector16(cb) { + const length = this.readUint16(); + return this._readVector(length, cb); + } + + readVector24(cb) { + const length = this.readUint24(); + return this._readVector(length, cb); + } + + readVectorBytes8() { + return this.readBytes(this.readUint8()); + } + + readVectorBytes16() { + return this.readBytes(this.readUint16()); + } + + readVectorBytes24() { + return this.readBytes(this.readUint24()); + } +} + + +class utils_BufferWriter extends utils_BufferWithPointer { + constructor(size = 1024) { + super(new Uint8Array(size)); + } + + _maybeGrow(n) { + const curSize = this._buffer.byteLength; + const newPos = this._pos + n; + const shortfall = newPos - curSize; + if (shortfall > 0) { + // Classic grow-by-doubling, up to 4kB max increment. + // This formula was not arrived at by any particular science. + const incr = Math.min(curSize, 4 * 1024); + const newbuf = new Uint8Array(curSize + Math.ceil(shortfall / incr) * incr); + newbuf.set(this._buffer, 0); + this._buffer = newbuf; + this._dataview = new DataView(newbuf.buffer, newbuf.byteOffset, newbuf.byteLength); + } + } + + slice(start = 0, end = this.tell()) { + if (end < 0) { + end = this.tell() + end; + } + if (start < 0) { + throw new TLSError(ALERT_DESCRIPTION.INTERNAL_ERROR); + } + if (end < 0) { + throw new TLSError(ALERT_DESCRIPTION.INTERNAL_ERROR); + } + if (end > this.length()) { + throw new TLSError(ALERT_DESCRIPTION.INTERNAL_ERROR); + } + return this._buffer.slice(start, end); + } + + flush() { + const slice = this.slice(); + this.seek(0); + return slice; + } + + writeBytes(data) { + this._maybeGrow(data.byteLength); + this._buffer.set(data, this.tell()); + this.incr(data.byteLength); + } + + writeUint8(n) { + this._maybeGrow(1); + this._dataview.setUint8(this._pos, n); + this.incr(1); + } + + writeUint16(n) { + this._maybeGrow(2); + this._dataview.setUint16(this._pos, n); + this.incr(2); + } + + writeUint24(n) { + this._maybeGrow(3); + this._dataview.setUint16(this._pos, n >> 8); + this._dataview.setUint8(this._pos + 2, n & 0xFF); + this.incr(3); + } + + writeUint32(n) { + this._maybeGrow(4); + this._dataview.setUint32(this._pos, n); + this.incr(4); + } + + // These are helpers for writing the variable-length vector structure + // defined in https://tools.ietf.org/html/rfc8446#section-3.4. + // + // Such vectors are represented as a length followed by the concatenated + // bytes of each item, and the size of the length field is determined by + // the maximum allowed size of the vector. For example to write a vector + // that may contain up to 65535 bytes, use `writeVector16`. + // + // To write a variable-length vector of between 1 and 100 uint16 values, + // defined in the RFC like this: + // + // uint16 items<2..200>; + // + // You would do something like this: + // + // buf.writeVector8(buf => { + // for (let item of items) { + // buf.writeUint16(item) + // } + // }) + // + // The helper will automatically take care of writing the appropriate + // length field once the callback completes. + + _writeVector(maxLength, writeLength, cb) { + // Initially, write the length field as zero. + const lengthPos = this.tell(); + writeLength(0); + // Call the callback to write the vector items. + const bodyPos = this.tell(); + cb(this); + const length = this.tell() - bodyPos; + if (length >= maxLength) { + throw new TLSError(ALERT_DESCRIPTION.INTERNAL_ERROR); + } + // Backfill the actual length field. + this.seek(lengthPos); + writeLength(length); + this.incr(length); + return length; + } + + writeVector8(cb) { + return this._writeVector(Math.pow(2, 8), len => this.writeUint8(len), cb); + } + + writeVector16(cb) { + return this._writeVector(Math.pow(2, 16), len => this.writeUint16(len), cb); + } + + writeVector24(cb) { + return this._writeVector(Math.pow(2, 24), len => this.writeUint24(len), cb); + } + + writeVectorBytes8(bytes) { + return this.writeVector8(buf => { + buf.writeBytes(bytes); + }); + } + + writeVectorBytes16(bytes) { + return this.writeVector16(buf => { + buf.writeBytes(bytes); + }); + } + + writeVectorBytes24(bytes) { + return this.writeVector24(buf => { + buf.writeBytes(bytes); + }); + } +} + +// CONCATENATED MODULE: ./src/crypto.js +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +// +// Low-level crypto primitives. +// +// This file implements the AEAD encrypt/decrypt and hashing routines +// for the TLS_AES_128_GCM_SHA256 ciphersuite. They are (thankfully) +// fairly light-weight wrappers around what's available via the WebCrypto +// API. +// + + + + +const AEAD_SIZE_INFLATION = 16; +const KEY_LENGTH = 16; +const IV_LENGTH = 12; +const HASH_LENGTH = 32; + +async function prepareKey(key, mode) { + return crypto.subtle.importKey('raw', key, { name: 'AES-GCM' }, false, [mode]); +} + +async function encrypt(key, iv, plaintext, additionalData) { + const ciphertext = await crypto.subtle.encrypt({ + additionalData, + iv, + name: 'AES-GCM', + tagLength: AEAD_SIZE_INFLATION * 8 + }, key, plaintext); + return new Uint8Array(ciphertext); +} + +async function decrypt(key, iv, ciphertext, additionalData) { + try { + const plaintext = await crypto.subtle.decrypt({ + additionalData, + iv, + name: 'AES-GCM', + tagLength: AEAD_SIZE_INFLATION * 8 + }, key, ciphertext); + return new Uint8Array(plaintext); + } catch (err) { + // Yes, we really do throw 'decrypt_error' when failing to verify a HMAC, + // and a 'bad_record_mac' error when failing to decrypt. + throw new TLSError(ALERT_DESCRIPTION.BAD_RECORD_MAC); + } +} + +async function hash(message) { + return new Uint8Array(await crypto.subtle.digest({ name: 'SHA-256' }, message)); +} + +async function hmac(keyBytes, message) { + const key = await crypto.subtle.importKey('raw', keyBytes, { + hash: { name: 'SHA-256' }, + name: 'HMAC', + }, false, ['sign']); + const sig = await crypto.subtle.sign({ name: 'HMAC' }, key, message); + return new Uint8Array(sig); +} + +async function verifyHmac(keyBytes, signature, message) { + const key = await crypto.subtle.importKey('raw', keyBytes, { + hash: { name: 'SHA-256' }, + name: 'HMAC', + }, false, ['verify']); + if (! await crypto.subtle.verify({ name: 'HMAC' }, key, signature, message)) { + // Yes, we really do throw 'decrypt_error' when failing to verify a HMAC, + // and a 'bad_record_mac' error when failing to decrypt. + throw new TLSError(ALERT_DESCRIPTION.DECRYPT_ERROR); + } +} + +async function hkdfExtract(salt, ikm) { + // Ref https://tools.ietf.org/html/rfc5869#section-2.2 + return await hmac(salt, ikm); +} + +async function hkdfExpand(prk, info, length) { + // Ref https://tools.ietf.org/html/rfc5869#section-2.3 + const N = Math.ceil(length / HASH_LENGTH); + if (N <= 0) { + throw new TLSError(ALERT_DESCRIPTION.INTERNAL_ERROR); + } + if (N >= 255) { + throw new TLSError(ALERT_DESCRIPTION.INTERNAL_ERROR); + } + const input = new utils_BufferWriter(); + const output = new utils_BufferWriter(); + let T = new Uint8Array(0); + for (let i = 1; i <= N; i++) { + input.writeBytes(T); + input.writeBytes(info); + input.writeUint8(i); + T = await hmac(prk, input.flush()); + output.writeBytes(T); + } + return output.slice(0, length); +} + +async function hkdfExpandLabel(secret, label, context, length) { + // struct { + // uint16 length = Length; + // opaque label < 7..255 > = "tls13 " + Label; + // opaque context < 0..255 > = Context; + // } HkdfLabel; + const hkdfLabel = new utils_BufferWriter(); + hkdfLabel.writeUint16(length); + hkdfLabel.writeVectorBytes8(utf8ToBytes('tls13 ' + label)); + hkdfLabel.writeVectorBytes8(context); + return hkdfExpand(secret, hkdfLabel.flush(), length); +} + +async function getRandomBytes(size) { + const bytes = new Uint8Array(size); + crypto.getRandomValues(bytes); + return bytes; +} + +// CONCATENATED MODULE: ./src/extensions.js +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +// +// Extension parsing. +// +// This file contains some helpers for reading/writing the various kinds +// of Extension that might appear in a HandshakeMessage. +// +// "Extensions" are how TLS signals the presence of particular bits of optional +// functionality in the protocol. Lots of parts of TLS1.3 that don't seem like +// they're optional are implemented in terms of an extension, IIUC because that's +// what was needed for a clean deployment in amongst earlier versions of the protocol. +// + + + + + +/* eslint-disable sorting/sort-object-props */ +const EXTENSION_TYPE = { + PRE_SHARED_KEY: 41, + SUPPORTED_VERSIONS: 43, + PSK_KEY_EXCHANGE_MODES: 45, +}; +/* eslint-enable sorting/sort-object-props */ + +// Base class for generic reading/writing of extensions, +// which are all uniformly formatted as: +// +// struct { +// ExtensionType extension_type; +// opaque extension_data<0..2^16-1>; +// } Extension; +// +// Extensions always appear inside of a handshake message, +// and their internal structure may differ based on the +// type of that message. + +class extensions_Extension { + + get TYPE_TAG() { + throw new Error('not implemented'); + } + + static read(messageType, buf) { + const type = buf.readUint16(); + let ext = { + TYPE_TAG: type, + }; + buf.readVector16(buf => { + switch (type) { + case EXTENSION_TYPE.PRE_SHARED_KEY: + ext = extensions_PreSharedKeyExtension._read(messageType, buf); + break; + case EXTENSION_TYPE.SUPPORTED_VERSIONS: + ext = extensions_SupportedVersionsExtension._read(messageType, buf); + break; + case EXTENSION_TYPE.PSK_KEY_EXCHANGE_MODES: + ext = extensions_PskKeyExchangeModesExtension._read(messageType, buf); + break; + default: + // Skip over unrecognised extensions. + buf.incr(buf.length()); + } + if (buf.hasMoreBytes()) { + throw new TLSError(ALERT_DESCRIPTION.DECODE_ERROR); + } + }); + return ext; + } + + write(messageType, buf) { + buf.writeUint16(this.TYPE_TAG); + buf.writeVector16(buf => { + this._write(messageType, buf); + }); + } + + static _read(messageType, buf) { + throw new Error('not implemented'); + } + + static _write(messageType, buf) { + throw new Error('not implemented'); + } +} + +// The PreSharedKey extension: +// +// struct { +// opaque identity<1..2^16-1>; +// uint32 obfuscated_ticket_age; +// } PskIdentity; +// opaque PskBinderEntry<32..255>; +// struct { +// PskIdentity identities<7..2^16-1>; +// PskBinderEntry binders<33..2^16-1>; +// } OfferedPsks; +// struct { +// select(Handshake.msg_type) { +// case client_hello: OfferedPsks; +// case server_hello: uint16 selected_identity; +// }; +// } PreSharedKeyExtension; + +class extensions_PreSharedKeyExtension extends extensions_Extension { + constructor(identities, binders, selectedIdentity) { + super(); + this.identities = identities; + this.binders = binders; + this.selectedIdentity = selectedIdentity; + } + + get TYPE_TAG() { + return EXTENSION_TYPE.PRE_SHARED_KEY; + } + + static _read(messageType, buf) { + let identities = null, binders = null, selectedIdentity = null; + switch (messageType) { + case HANDSHAKE_TYPE.CLIENT_HELLO: + identities = []; binders = []; + buf.readVector16(buf => { + const identity = buf.readVectorBytes16(); + buf.readBytes(4); // Skip over the ticket age. + identities.push(identity); + }); + buf.readVector16(buf => { + const binder = buf.readVectorBytes8(); + if (binder.byteLength < HASH_LENGTH) { + throw new TLSError(ALERT_DESCRIPTION.ILLEGAL_PARAMETER); + } + binders.push(binder); + }); + if (identities.length !== binders.length) { + throw new TLSError(ALERT_DESCRIPTION.ILLEGAL_PARAMETER); + } + break; + case HANDSHAKE_TYPE.SERVER_HELLO: + selectedIdentity = buf.readUint16(); + break; + default: + throw new TLSError(ALERT_DESCRIPTION.ILLEGAL_PARAMETER); + } + return new this(identities, binders, selectedIdentity); + } + + _write(messageType, buf) { + switch (messageType) { + case HANDSHAKE_TYPE.CLIENT_HELLO: + buf.writeVector16(buf => { + this.identities.forEach(pskId => { + buf.writeVectorBytes16(pskId); + buf.writeUint32(0); // Zero for "tag age" field. + }); + }); + buf.writeVector16(buf => { + this.binders.forEach(pskBinder => { + buf.writeVectorBytes8(pskBinder); + }); + }); + break; + case HANDSHAKE_TYPE.SERVER_HELLO: + buf.writeUint16(this.selectedIdentity); + break; + default: + throw new TLSError(ALERT_DESCRIPTION.INTERNAL_ERROR); + } + } +} + + +// The SupportedVersions extension: +// +// struct { +// select(Handshake.msg_type) { +// case client_hello: +// ProtocolVersion versions < 2..254 >; +// case server_hello: +// ProtocolVersion selected_version; +// }; +// } SupportedVersions; + +class extensions_SupportedVersionsExtension extends extensions_Extension { + constructor(versions, selectedVersion) { + super(); + this.versions = versions; + this.selectedVersion = selectedVersion; + } + + get TYPE_TAG() { + return EXTENSION_TYPE.SUPPORTED_VERSIONS; + } + + static _read(messageType, buf) { + let versions = null, selectedVersion = null; + switch (messageType) { + case HANDSHAKE_TYPE.CLIENT_HELLO: + versions = []; + buf.readVector8(buf => { + versions.push(buf.readUint16()); + }); + break; + case HANDSHAKE_TYPE.SERVER_HELLO: + selectedVersion = buf.readUint16(); + break; + default: + throw new TLSError(ALERT_DESCRIPTION.ILLEGAL_PARAMETER); + } + return new this(versions, selectedVersion); + } + + _write(messageType, buf) { + switch (messageType) { + case HANDSHAKE_TYPE.CLIENT_HELLO: + buf.writeVector8(buf => { + this.versions.forEach(version => { + buf.writeUint16(version); + }); + }); + break; + case HANDSHAKE_TYPE.SERVER_HELLO: + buf.writeUint16(this.selectedVersion); + break; + default: + throw new TLSError(ALERT_DESCRIPTION.INTERNAL_ERROR); + } + } +} + + +class extensions_PskKeyExchangeModesExtension extends extensions_Extension { + constructor(modes) { + super(); + this.modes = modes; + } + + get TYPE_TAG() { + return EXTENSION_TYPE.PSK_KEY_EXCHANGE_MODES; + } + + static _read(messageType, buf) { + const modes = []; + switch (messageType) { + case HANDSHAKE_TYPE.CLIENT_HELLO: + buf.readVector8(buf => { + modes.push(buf.readUint8()); + }); + break; + default: + throw new TLSError(ALERT_DESCRIPTION.ILLEGAL_PARAMETER); + } + return new this(modes); + } + + _write(messageType, buf) { + switch (messageType) { + case HANDSHAKE_TYPE.CLIENT_HELLO: + buf.writeVector8(buf => { + this.modes.forEach(mode => { + buf.writeUint8(mode); + }); + }); + break; + default: + throw new TLSError(ALERT_DESCRIPTION.INTERNAL_ERROR); + } + } +} + +// CONCATENATED MODULE: ./src/constants.js +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +const VERSION_TLS_1_0 = 0x0301; +const VERSION_TLS_1_2 = 0x0303; +const VERSION_TLS_1_3 = 0x0304; +const TLS_AES_128_GCM_SHA256 = 0x1301; +const PSK_MODE_KE = 0; + +// CONCATENATED MODULE: ./src/messages.js +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +// +// Message parsing. +// +// Herein we have code for reading and writing the various Handshake +// messages involved in the TLS protocol. +// + + + + + + + +/* eslint-disable sorting/sort-object-props */ +const HANDSHAKE_TYPE = { + CLIENT_HELLO: 1, + SERVER_HELLO: 2, + NEW_SESSION_TICKET: 4, + ENCRYPTED_EXTENSIONS: 8, + FINISHED: 20, +}; +/* eslint-enable sorting/sort-object-props */ + +// Base class for generic reading/writing of handshake messages, +// which are all uniformly formatted as: +// +// struct { +// HandshakeType msg_type; /* handshake type */ +// uint24 length; /* bytes in message */ +// select(Handshake.msg_type) { +// ... type specific cases here ... +// }; +// } Handshake; + +class messages_HandshakeMessage { + + get TYPE_TAG() { + throw new Error('not implemented'); + } + + static fromBytes(bytes) { + // Each handshake message has a type and length prefix, per + // https://tools.ietf.org/html/rfc8446#appendix-B.3 + const buf = new utils_BufferReader(bytes); + const msg = this.read(buf); + if (buf.hasMoreBytes()) { + throw new TLSError(ALERT_DESCRIPTION.DECODE_ERROR); + } + return msg; + } + + toBytes() { + const buf = new utils_BufferWriter(); + this.write(buf); + return buf.flush(); + } + + static read(buf) { + const type = buf.readUint8(); + let msg = null; + buf.readVector24(buf => { + switch (type) { + case HANDSHAKE_TYPE.CLIENT_HELLO: + msg = messages_ClientHello._read(buf); + break; + case HANDSHAKE_TYPE.SERVER_HELLO: + msg = messages_ServerHello._read(buf); + break; + case HANDSHAKE_TYPE.NEW_SESSION_TICKET: + msg = messages_NewSessionTicket._read(buf); + break; + case HANDSHAKE_TYPE.ENCRYPTED_EXTENSIONS: + msg = EncryptedExtensions._read(buf); + break; + case HANDSHAKE_TYPE.FINISHED: + msg = messages_Finished._read(buf); + break; + } + if (buf.hasMoreBytes()) { + throw new TLSError(ALERT_DESCRIPTION.DECODE_ERROR); + } + }); + if (msg === null) { + throw new TLSError(ALERT_DESCRIPTION.UNEXPECTED_MESSAGE); + } + return msg; + } + + write(buf) { + buf.writeUint8(this.TYPE_TAG); + buf.writeVector24(buf => { + this._write(buf); + }); + } + + static _read(buf) { + throw new Error('not implemented'); + } + + _write(buf) { + throw new Error('not implemented'); + } + + // Some little helpers for reading a list of extensions, + // which is uniformly represented as: + // + // Extension extensions<8..2^16-1>; + // + // Recognized extensions are returned as a Map from extension type + // to extension data object, with a special `lastSeenExtension` + // property to make it easy to check which one came last. + + static _readExtensions(messageType, buf) { + const extensions = new Map(); + buf.readVector16(buf => { + const ext = extensions_Extension.read(messageType, buf); + if (extensions.has(ext.TYPE_TAG)) { + throw new TLSError(ALERT_DESCRIPTION.DECODE_ERROR); + } + extensions.set(ext.TYPE_TAG, ext); + extensions.lastSeenExtension = ext.TYPE_TAG; + }); + return extensions; + } + + _writeExtensions(buf, extensions) { + buf.writeVector16(buf => { + extensions.forEach(ext => { + ext.write(this.TYPE_TAG, buf); + }); + }); + } +} + + +// The ClientHello message: +// +// struct { +// ProtocolVersion legacy_version = 0x0303; +// Random random; +// opaque legacy_session_id<0..32>; +// CipherSuite cipher_suites<2..2^16-2>; +// opaque legacy_compression_methods<1..2^8-1>; +// Extension extensions<8..2^16-1>; +// } ClientHello; + +class messages_ClientHello extends messages_HandshakeMessage { + + constructor(random, sessionId, extensions) { + super(); + this.random = random; + this.sessionId = sessionId; + this.extensions = extensions; + } + + get TYPE_TAG() { + return HANDSHAKE_TYPE.CLIENT_HELLO; + } + + static _read(buf) { + // The legacy_version field may indicate an earlier version of TLS + // for backwards compatibility, but must not predate TLS 1.0! + if (buf.readUint16() < VERSION_TLS_1_0) { + throw new TLSError(ALERT_DESCRIPTION.PROTOCOL_VERSION); + } + // The random bytes provided by the peer. + const random = buf.readBytes(32); + // Read legacy_session_id, so the server can echo it. + const sessionId = buf.readVectorBytes8(); + // We only support a single ciphersuite, but the peer may offer several. + // Scan the list to confirm that the one we want is present. + let found = false; + buf.readVector16(buf => { + const cipherSuite = buf.readUint16(); + if (cipherSuite === TLS_AES_128_GCM_SHA256) { + found = true; + } + }); + if (! found) { + throw new TLSError(ALERT_DESCRIPTION.HANDSHAKE_FAILURE); + } + // legacy_compression_methods must be a single zero byte for TLS1.3 ClientHellos. + // It can be non-zero in previous versions of TLS, but we're not going to + // make a successful handshake with such versions, so better to just bail out now. + const legacyCompressionMethods = buf.readVectorBytes8(); + if (legacyCompressionMethods.byteLength !== 1) { + throw new TLSError(ALERT_DESCRIPTION.ILLEGAL_PARAMETER); + } + if (legacyCompressionMethods[0] !== 0x00) { + throw new TLSError(ALERT_DESCRIPTION.ILLEGAL_PARAMETER); + } + // Read and check the extensions. + const extensions = this._readExtensions(HANDSHAKE_TYPE.CLIENT_HELLO, buf); + if (! extensions.has(EXTENSION_TYPE.SUPPORTED_VERSIONS)) { + throw new TLSError(ALERT_DESCRIPTION.MISSING_EXTENSION); + } + if (extensions.get(EXTENSION_TYPE.SUPPORTED_VERSIONS).versions.indexOf(VERSION_TLS_1_3) === -1) { + throw new TLSError(ALERT_DESCRIPTION.PROTOCOL_VERSION); + } + // Was the PreSharedKey extension the last one? + if (extensions.has(EXTENSION_TYPE.PRE_SHARED_KEY)) { + if (extensions.lastSeenExtension !== EXTENSION_TYPE.PRE_SHARED_KEY) { + throw new TLSError(ALERT_DESCRIPTION.ILLEGAL_PARAMETER); + } + } + return new this(random, sessionId, extensions); + } + + _write(buf) { + buf.writeUint16(VERSION_TLS_1_2); + buf.writeBytes(this.random); + buf.writeVectorBytes8(this.sessionId); + // Our single supported ciphersuite + buf.writeVector16(buf => { + buf.writeUint16(TLS_AES_128_GCM_SHA256); + }); + // A single zero byte for legacy_compression_methods + buf.writeVectorBytes8(new Uint8Array(1)); + this._writeExtensions(buf, this.extensions); + } +} + + +// The ServerHello message: +// +// struct { +// ProtocolVersion legacy_version = 0x0303; /* TLS v1.2 */ +// Random random; +// opaque legacy_session_id_echo<0..32>; +// CipherSuite cipher_suite; +// uint8 legacy_compression_method = 0; +// Extension extensions < 6..2 ^ 16 - 1 >; +// } ServerHello; + +class messages_ServerHello extends messages_HandshakeMessage { + + constructor(random, sessionId, extensions) { + super(); + this.random = random; + this.sessionId = sessionId; + this.extensions = extensions; + } + + get TYPE_TAG() { + return HANDSHAKE_TYPE.SERVER_HELLO; + } + + static _read(buf) { + // Fixed value for legacy_version. + if (buf.readUint16() !== VERSION_TLS_1_2) { + throw new TLSError(ALERT_DESCRIPTION.ILLEGAL_PARAMETER); + } + // Random bytes from the server. + const random = buf.readBytes(32); + // It should have echoed our vector for legacy_session_id. + const sessionId = buf.readVectorBytes8(); + // It should have selected our single offered ciphersuite. + if (buf.readUint16() !== TLS_AES_128_GCM_SHA256) { + throw new TLSError(ALERT_DESCRIPTION.ILLEGAL_PARAMETER); + } + // legacy_compression_method must be zero. + if (buf.readUint8() !== 0) { + throw new TLSError(ALERT_DESCRIPTION.ILLEGAL_PARAMETER); + } + const extensions = this._readExtensions(HANDSHAKE_TYPE.SERVER_HELLO, buf); + if (! extensions.has(EXTENSION_TYPE.SUPPORTED_VERSIONS)) { + throw new TLSError(ALERT_DESCRIPTION.MISSING_EXTENSION); + } + if (extensions.get(EXTENSION_TYPE.SUPPORTED_VERSIONS).selectedVersion !== VERSION_TLS_1_3) { + throw new TLSError(ALERT_DESCRIPTION.ILLEGAL_PARAMETER); + } + return new this(random, sessionId, extensions); + } + + _write(buf) { + buf.writeUint16(VERSION_TLS_1_2); + buf.writeBytes(this.random); + buf.writeVectorBytes8(this.sessionId); + // Our single supported ciphersuite + buf.writeUint16(TLS_AES_128_GCM_SHA256); + // A single zero byte for legacy_compression_method + buf.writeUint8(0); + this._writeExtensions(buf, this.extensions); + } +} + + +// The EncryptedExtensions message: +// +// struct { +// Extension extensions < 0..2 ^ 16 - 1 >; +// } EncryptedExtensions; +// +// We don't actually send any EncryptedExtensions, +// but still have to send an empty message. + +class EncryptedExtensions extends messages_HandshakeMessage { + constructor(extensions) { + super(); + this.extensions = extensions; + } + + get TYPE_TAG() { + return HANDSHAKE_TYPE.ENCRYPTED_EXTENSIONS; + } + + static _read(buf) { + const extensions = this._readExtensions(HANDSHAKE_TYPE.ENCRYPTED_EXTENSIONS, buf); + return new this(extensions); + } + + _write(buf) { + this._writeExtensions(buf, this.extensions); + } +} + + +// The Finished message: +// +// struct { +// opaque verify_data[Hash.length]; +// } Finished; + +class messages_Finished extends messages_HandshakeMessage { + + constructor(verifyData) { + super(); + this.verifyData = verifyData; + } + + get TYPE_TAG() { + return HANDSHAKE_TYPE.FINISHED; + } + + static _read(buf) { + const verifyData = buf.readBytes(HASH_LENGTH); + return new this(verifyData); + } + + _write(buf) { + buf.writeBytes(this.verifyData); + } +} + + +// The NewSessionTicket message: +// +// struct { +// uint32 ticket_lifetime; +// uint32 ticket_age_add; +// opaque ticket_nonce < 0..255 >; +// opaque ticket < 1..2 ^ 16 - 1 >; +// Extension extensions < 0..2 ^ 16 - 2 >; +// } NewSessionTicket; +// +// We don't actually make use of these, but we need to be able +// to accept them and do basic validation. + +class messages_NewSessionTicket extends messages_HandshakeMessage { + constructor(ticketLifetime, ticketAgeAdd, ticketNonce, ticket, extensions) { + super(); + this.ticketLifetime = ticketLifetime; + this.ticketAgeAdd = ticketAgeAdd; + this.ticketNonce = ticketNonce; + this.ticket = ticket; + this.extensions = extensions; + } + + get TYPE_TAG() { + return HANDSHAKE_TYPE.NEW_SESSION_TICKET; + } + + static _read(buf) { + const ticketLifetime = buf.readUint32(); + const ticketAgeAdd = buf.readUint32(); + const ticketNonce = buf.readVectorBytes8(); + const ticket = buf.readVectorBytes16(); + if (ticket.byteLength < 1) { + throw new TLSError(ALERT_DESCRIPTION.DECODE_ERROR); + } + const extensions = this._readExtensions(HANDSHAKE_TYPE.NEW_SESSION_TICKET, buf); + return new this(ticketLifetime, ticketAgeAdd, ticketNonce, ticket, extensions); + } + + _write(buf) { + buf.writeUint32(this.ticketLifetime); + buf.writeUint32(this.ticketAgeAdd); + buf.writeVectorBytes8(this.ticketNonce); + buf.writeVectorBytes16(this.ticket); + this._writeExtensions(buf, this.extensions); + } +} + +// CONCATENATED MODULE: ./src/states.js +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + + + + + + + + +// +// State-machine for TLS Handshake Management. +// +// Internally, we manage the TLS connection by explicitly modelling the +// client and server state-machines from RFC8446. You can think of +// these `State` objects as little plugins for the `Connection` class +// that provide different behaviours of `send` and `receive` depending +// on the state of the connection. +// + +class states_State { + + constructor(conn) { + this.conn = conn; + } + + async initialize() { + // By default, nothing to do when entering the state. + } + + async sendApplicationData(bytes) { + // By default, assume we're not ready to send yet and the caller + // should be blocking on the connection promise before reaching here. + throw new TLSError(ALERT_DESCRIPTION.INTERNAL_ERROR); + } + + async recvApplicationData(bytes) { + throw new TLSError(ALERT_DESCRIPTION.UNEXPECTED_MESSAGE); + } + + async recvHandshakeMessage(msg) { + throw new TLSError(ALERT_DESCRIPTION.UNEXPECTED_MESSAGE); + } + + async recvAlertMessage(alert) { + switch (alert.description) { + case ALERT_DESCRIPTION.CLOSE_NOTIFY: + this.conn._closeForRecv(alert); + throw alert; + default: + return await this.handleErrorAndRethrow(alert); + } + } + + async recvChangeCipherSpec(bytes) { + throw new TLSError(ALERT_DESCRIPTION.UNEXPECTED_MESSAGE); + } + + async handleErrorAndRethrow(err) { + let alert = err; + if (! (alert instanceof TLSAlert)) { + alert = new TLSError(ALERT_DESCRIPTION.INTERNAL_ERROR); + } + // Try to send error alert to the peer, but we may not + // be able to if the outgoing connection was already closed. + try { + await this.conn._sendAlertMessage(alert); + } catch (_) { } + await this.conn._transition(ERROR, err); + throw err; + } + + async close() { + const alert = new TLSCloseNotify(); + await this.conn._sendAlertMessage(alert); + this.conn._closeForSend(alert); + } + +} + +// A special "guard" state to prevent us from using +// an improperly-initialized Connection. + +class UNINITIALIZED extends states_State { + async initialize() { + throw new Error('uninitialized state'); + } + async sendApplicationData(bytes) { + throw new Error('uninitialized state'); + } + async recvApplicationData(bytes) { + throw new Error('uninitialized state'); + } + async recvHandshakeMessage(msg) { + throw new Error('uninitialized state'); + } + async recvChangeCipherSpec(bytes) { + throw new Error('uninitialized state'); + } + async handleErrorAndRethrow(err) { + throw err; + } + async close() { + throw new Error('uninitialized state'); + } +} + +// A special "error" state for when something goes wrong. +// This state never transitions to another state, effectively +// terminating the connection. + +class ERROR extends states_State { + async initialize(err) { + this.error = err; + this.conn._setConnectionFailure(err); + // Unceremoniously shut down the record layer on error. + this.conn._recordlayer.setSendError(err); + this.conn._recordlayer.setRecvError(err); + } + async sendApplicationData(bytes) { + throw this.error; + } + async recvApplicationData(bytes) { + throw this.error; + } + async recvHandshakeMessage(msg) { + throw this.error; + } + async recvAlertMessage(err) { + throw this.error; + } + async recvChangeCipherSpec(bytes) { + throw this.error; + } + async handleErrorAndRethrow(err) { + throw err; + } + async close() { + throw this.error; + } +} + +// The "connected" state, for when the handshake is complete +// and we're ready to send application-level data. +// The logic for this is largely symmetric between client and server. + +class states_CONNECTED extends states_State { + async initialize() { + this.conn._setConnectionSuccess(); + } + async sendApplicationData(bytes) { + await this.conn._sendApplicationData(bytes); + } + async recvApplicationData(bytes) { + return bytes; + } + async recvChangeCipherSpec(bytes) { + throw new TLSError(ALERT_DESCRIPTION.UNEXPECTED_MESSAGE); + } +} + +// A base class for states that occur in the middle of the handshake +// (that is, between ClientHello and Finished). These states may receive +// CHANGE_CIPHER_SPEC records for b/w compat reasons, which must contain +// exactly a single 0x01 byte and must otherwise be ignored. + +class states_MidHandshakeState extends states_State { + async recvChangeCipherSpec(bytes) { + if (this.conn._hasSeenChangeCipherSpec) { + throw new TLSError(ALERT_DESCRIPTION.UNEXPECTED_MESSAGE); + } + if (bytes.byteLength !== 1 || bytes[0] !== 1) { + throw new TLSError(ALERT_DESCRIPTION.UNEXPECTED_MESSAGE); + } + this.conn._hasSeenChangeCipherSpec = true; + } +} + +// These states implement (part of) the client state-machine from +// https://tools.ietf.org/html/rfc8446#appendix-A.1 +// +// Since we're only implementing a small subset of TLS1.3, +// we only need a small subset of the handshake. It basically goes: +// +// * send ClientHello +// * receive ServerHello +// * receive EncryptedExtensions +// * receive server Finished +// * send client Finished +// +// We include some unused states for completeness, so that it's easier +// to check the implementation against the diagrams in the RFC. + +class states_CLIENT_START extends states_State { + async initialize() { + const keyschedule = this.conn._keyschedule; + await keyschedule.addPSK(this.conn.psk); + // Construct a ClientHello message with our single PSK. + // We can't know the PSK binder value yet, so we initially write zeros. + const clientHello = new messages_ClientHello( + // Client random salt. + await getRandomBytes(32), + // Random legacy_session_id; we *could* send an empty string here, + // but sending a random one makes it easier to be compatible with + // the data emitted by tlslite-ng for test-case generation. + await getRandomBytes(32), + [ + new extensions_SupportedVersionsExtension([VERSION_TLS_1_3]), + new extensions_PskKeyExchangeModesExtension([PSK_MODE_KE]), + new extensions_PreSharedKeyExtension([this.conn.pskId], [zeros(HASH_LENGTH)]), + ], + ); + const buf = new utils_BufferWriter(); + clientHello.write(buf); + // Now that we know what the ClientHello looks like, + // go back and calculate the appropriate PSK binder value. + // We only support a single PSK, so the length of the binders field is the + // length of the hash plus one for rendering it as a variable-length byte array, + // plus two for rendering the variable-length list of PSK binders. + const PSK_BINDERS_SIZE = HASH_LENGTH + 1 + 2; + const truncatedTranscript = buf.slice(0, buf.tell() - PSK_BINDERS_SIZE); + const pskBinder = await keyschedule.calculateFinishedMAC(keyschedule.extBinderKey, truncatedTranscript); + buf.incr(-HASH_LENGTH); + buf.writeBytes(pskBinder); + await this.conn._sendHandshakeMessageBytes(buf.flush()); + await this.conn._transition(states_CLIENT_WAIT_SH, clientHello.sessionId); + } +} + +class states_CLIENT_WAIT_SH extends states_State { + async initialize(sessionId) { + this._sessionId = sessionId; + } + async recvHandshakeMessage(msg) { + if (! (msg instanceof messages_ServerHello)) { + throw new TLSError(ALERT_DESCRIPTION.UNEXPECTED_MESSAGE); + } + if (! bytesAreEqual(msg.sessionId, this._sessionId)) { + throw new TLSError(ALERT_DESCRIPTION.ILLEGAL_PARAMETER); + } + const pskExt = msg.extensions.get(EXTENSION_TYPE.PRE_SHARED_KEY); + if (! pskExt) { + throw new TLSError(ALERT_DESCRIPTION.MISSING_EXTENSION); + } + // We expect only the SUPPORTED_VERSIONS and PRE_SHARED_KEY extensions. + if (msg.extensions.size !== 2) { + throw new TLSError(ALERT_DESCRIPTION.UNSUPPORTED_EXTENSION); + } + if (pskExt.selectedIdentity !== 0) { + throw new TLSError(ALERT_DESCRIPTION.ILLEGAL_PARAMETER); + } + await this.conn._keyschedule.addECDHE(null); + await this.conn._setSendKey(this.conn._keyschedule.clientHandshakeTrafficSecret); + await this.conn._setRecvKey(this.conn._keyschedule.serverHandshakeTrafficSecret); + await this.conn._transition(states_CLIENT_WAIT_EE); + } +} + +class states_CLIENT_WAIT_EE extends states_MidHandshakeState { + async recvHandshakeMessage(msg) { + // We don't make use of any encrypted extensions, but we still + // have to wait for the server to send the (empty) list of them. + if (! (msg instanceof EncryptedExtensions)) { + throw new TLSError(ALERT_DESCRIPTION.UNEXPECTED_MESSAGE); + } + // We do not support any EncryptedExtensions. + if (msg.extensions.size !== 0) { + throw new TLSError(ALERT_DESCRIPTION.UNSUPPORTED_EXTENSION); + } + const keyschedule = this.conn._keyschedule; + const serverFinishedTranscript = keyschedule.getTranscript(); + await this.conn._transition(states_CLIENT_WAIT_FINISHED, serverFinishedTranscript); + } +} + +class states_CLIENT_WAIT_FINISHED extends states_State { + async initialize(serverFinishedTranscript) { + this._serverFinishedTranscript = serverFinishedTranscript; + } + async recvHandshakeMessage(msg) { + if (! (msg instanceof messages_Finished)) { + throw new TLSError(ALERT_DESCRIPTION.UNEXPECTED_MESSAGE); + } + // Verify server Finished MAC. + const keyschedule = this.conn._keyschedule; + await keyschedule.verifyFinishedMAC(keyschedule.serverHandshakeTrafficSecret, msg.verifyData, this._serverFinishedTranscript); + // Send our own Finished message in return. + // This must be encrypted with the handshake traffic key, + // but must not appear in the transcript used to calculate the application keys. + const clientFinishedMAC = await keyschedule.calculateFinishedMAC(keyschedule.clientHandshakeTrafficSecret); + await keyschedule.finalize(); + await this.conn._sendHandshakeMessage(new messages_Finished(clientFinishedMAC)); + await this.conn._setSendKey(keyschedule.clientApplicationTrafficSecret); + await this.conn._setRecvKey(keyschedule.serverApplicationTrafficSecret); + await this.conn._transition(states_CLIENT_CONNECTED); + } +} + +class states_CLIENT_CONNECTED extends states_CONNECTED { + async recvHandshakeMessage(msg) { + // A connected client must be prepared to accept NewSessionTicket + // messages. We never use them, but other server implementations + // might send them. + if (! (msg instanceof messages_NewSessionTicket)) { + throw new TLSError(ALERT_DESCRIPTION.UNEXPECTED_MESSAGE); + } + } +} + +// These states implement (part of) the server state-machine from +// https://tools.ietf.org/html/rfc8446#appendix-A.2 +// +// Since we're only implementing a small subset of TLS1.3, +// we only need a small subset of the handshake. It basically goes: +// +// * receive ClientHello +// * send ServerHello +// * send empty EncryptedExtensions +// * send server Finished +// * receive client Finished +// +// We include some unused states for completeness, so that it's easier +// to check the implementation against the diagrams in the RFC. + +class states_SERVER_START extends states_State { + async recvHandshakeMessage(msg) { + if (! (msg instanceof messages_ClientHello)) { + throw new TLSError(ALERT_DESCRIPTION.UNEXPECTED_MESSAGE); + } + // In the spec, this is where we select connection parameters, and maybe + // tell the client to try again if we can't find a compatible set. + // Since we only support a fixed cipherset, the only thing to "negotiate" + // is whether they provided an acceptable PSK. + const pskExt = msg.extensions.get(EXTENSION_TYPE.PRE_SHARED_KEY); + const pskModesExt = msg.extensions.get(EXTENSION_TYPE.PSK_KEY_EXCHANGE_MODES); + if (! pskExt || ! pskModesExt) { + throw new TLSError(ALERT_DESCRIPTION.MISSING_EXTENSION); + } + if (pskModesExt.modes.indexOf(PSK_MODE_KE) === -1) { + throw new TLSError(ALERT_DESCRIPTION.HANDSHAKE_FAILURE); + } + const pskIndex = pskExt.identities.findIndex(pskId => bytesAreEqual(pskId, this.conn.pskId)); + if (pskIndex === -1) { + throw new TLSError(ALERT_DESCRIPTION.UNKNOWN_PSK_IDENTITY); + } + await this.conn._keyschedule.addPSK(this.conn.psk); + // Validate the PSK binder. + const keyschedule = this.conn._keyschedule; + const transcript = keyschedule.getTranscript(); + // Calculate size occupied by the PSK binders. + let pskBindersSize = 2; // Vector16 representation overhead. + for (const binder of pskExt.binders) { + pskBindersSize += binder.byteLength + 1; // Vector8 representation overhead. + } + await keyschedule.verifyFinishedMAC(keyschedule.extBinderKey, pskExt.binders[pskIndex], transcript.slice(0, -pskBindersSize)); + await this.conn._transition(states_SERVER_NEGOTIATED, msg.sessionId, pskIndex); + } +} + +class states_SERVER_NEGOTIATED extends states_MidHandshakeState { + async initialize(sessionId, pskIndex) { + await this.conn._sendHandshakeMessage(new messages_ServerHello( + // Server random + await getRandomBytes(32), + sessionId, + [ + new extensions_SupportedVersionsExtension(null, VERSION_TLS_1_3), + new extensions_PreSharedKeyExtension(null, null, pskIndex), + ] + )); + // If the client sent a non-empty sessionId, the server *must* send a change-cipher-spec for b/w compat. + if (sessionId.byteLength > 0) { + await this.conn._sendChangeCipherSpec(); + } + // We can now transition to the encrypted part of the handshake. + const keyschedule = this.conn._keyschedule; + await keyschedule.addECDHE(null); + await this.conn._setSendKey(keyschedule.serverHandshakeTrafficSecret); + await this.conn._setRecvKey(keyschedule.clientHandshakeTrafficSecret); + // Send an empty EncryptedExtensions message. + await this.conn._sendHandshakeMessage(new EncryptedExtensions([])); + // Send the Finished message. + const serverFinishedMAC = await keyschedule.calculateFinishedMAC(keyschedule.serverHandshakeTrafficSecret); + await this.conn._sendHandshakeMessage(new messages_Finished(serverFinishedMAC)); + // We can now *send* using the application traffic key, + // but have to wait to receive the client Finished before receiving under that key. + // We need to remember the handshake state from before the client Finished + // in order to successfully verify the client Finished. + const clientFinishedTranscript = await keyschedule.getTranscript(); + const clientHandshakeTrafficSecret = keyschedule.clientHandshakeTrafficSecret; + await keyschedule.finalize(); + await this.conn._setSendKey(keyschedule.serverApplicationTrafficSecret); + await this.conn._transition(states_SERVER_WAIT_FINISHED, clientHandshakeTrafficSecret, clientFinishedTranscript); + } +} + +class states_SERVER_WAIT_FINISHED extends states_MidHandshakeState { + async initialize(clientHandshakeTrafficSecret, clientFinishedTranscript) { + this._clientHandshakeTrafficSecret = clientHandshakeTrafficSecret; + this._clientFinishedTranscript = clientFinishedTranscript; + } + async recvHandshakeMessage(msg) { + if (! (msg instanceof messages_Finished)) { + throw new TLSError(ALERT_DESCRIPTION.UNEXPECTED_MESSAGE); + } + const keyschedule = this.conn._keyschedule; + await keyschedule.verifyFinishedMAC(this._clientHandshakeTrafficSecret, msg.verifyData, this._clientFinishedTranscript); + this._clientHandshakeTrafficSecret = this._clientFinishedTranscript = null; + await this.conn._setRecvKey(keyschedule.clientApplicationTrafficSecret); + await this.conn._transition(states_CONNECTED); + } +} + +// CONCATENATED MODULE: ./src/keyschedule.js +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +// TLS1.3 Key Schedule. +// +// In this file we implement the "key schedule" from +// https://tools.ietf.org/html/rfc8446#section-7.1, which +// defines how to calculate various keys as the handshake +// state progresses. + + + + + + + +// The `KeySchedule` class progresses through three stages corresponding +// to the three phases of the TLS1.3 key schedule: +// +// UNINITIALIZED +// | +// | addPSK() +// v +// EARLY_SECRET +// | +// | addECDHE() +// v +// HANDSHAKE_SECRET +// | +// | finalize() +// v +// MASTER_SECRET +// +// It will error out if the calling code attempts to add key material +// in the wrong order. + +const STAGE_UNINITIALIZED = 0; +const STAGE_EARLY_SECRET = 1; +const STAGE_HANDSHAKE_SECRET = 2; +const STAGE_MASTER_SECRET = 3; + +class keyschedule_KeySchedule { + constructor() { + this.stage = STAGE_UNINITIALIZED; + // WebCrypto doesn't support a rolling hash construct, so we have to + // keep the entire message transcript in memory. + this.transcript = new utils_BufferWriter(); + // This tracks the main secret from with other keys are derived at each stage. + this.secret = null; + // And these are all the various keys we'll derive as the handshake progresses. + this.extBinderKey = null; + this.clientHandshakeTrafficSecret = null; + this.serverHandshakeTrafficSecret = null; + this.clientApplicationTrafficSecret = null; + this.serverApplicationTrafficSecret = null; + } + + async addPSK(psk) { + // Use the selected PSK (if any) to calculate the "early secret". + if (psk === null) { + psk = zeros(HASH_LENGTH); + } + if (this.stage !== STAGE_UNINITIALIZED) { + throw new TLSError(ALERT_DESCRIPTION.INTERNAL_ERROR); + } + this.stage = STAGE_EARLY_SECRET; + this.secret = await hkdfExtract(zeros(HASH_LENGTH), psk); + this.extBinderKey = await this.deriveSecret('ext binder', EMPTY); + this.secret = await this.deriveSecret('derived', EMPTY); + } + + async addECDHE(ecdhe) { + // Mix in the ECDHE output (if any) to calculate the "handshake secret". + if (ecdhe === null) { + ecdhe = zeros(HASH_LENGTH); + } + if (this.stage !== STAGE_EARLY_SECRET) { + throw new TLSError(ALERT_DESCRIPTION.INTERNAL_ERROR); + } + this.stage = STAGE_HANDSHAKE_SECRET; + this.extBinderKey = null; + this.secret = await hkdfExtract(this.secret, ecdhe); + this.clientHandshakeTrafficSecret = await this.deriveSecret('c hs traffic'); + this.serverHandshakeTrafficSecret = await this.deriveSecret('s hs traffic'); + this.secret = await this.deriveSecret('derived', EMPTY); + } + + async finalize() { + if (this.stage !== STAGE_HANDSHAKE_SECRET) { + throw new TLSError(ALERT_DESCRIPTION.INTERNAL_ERROR); + } + this.stage = STAGE_MASTER_SECRET; + this.clientHandshakeTrafficSecret = null; + this.serverHandshakeTrafficSecret = null; + this.secret = await hkdfExtract(this.secret, zeros(HASH_LENGTH)); + this.clientApplicationTrafficSecret = await this.deriveSecret('c ap traffic'); + this.serverApplicationTrafficSecret = await this.deriveSecret('s ap traffic'); + this.secret = null; + } + + addToTranscript(bytes) { + this.transcript.writeBytes(bytes); + } + + getTranscript() { + return this.transcript.slice(); + } + + async deriveSecret(label, transcript = undefined) { + transcript = transcript || this.getTranscript(); + return await hkdfExpandLabel(this.secret, label, await hash(transcript), HASH_LENGTH); + } + + async calculateFinishedMAC(baseKey, transcript = undefined) { + transcript = transcript || this.getTranscript(); + const finishedKey = await hkdfExpandLabel(baseKey, 'finished', EMPTY, HASH_LENGTH); + return await hmac(finishedKey, await hash(transcript)); + } + + async verifyFinishedMAC(baseKey, mac, transcript = undefined) { + transcript = transcript || this.getTranscript(); + const finishedKey = await hkdfExpandLabel(baseKey, 'finished', EMPTY, HASH_LENGTH); + await verifyHmac(finishedKey, mac, await hash(transcript)); + } +} + +// CONCATENATED MODULE: ./src/recordlayer.js +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +// +// This file implements the "record layer" for TLS1.3, as defined in +// https://tools.ietf.org/html/rfc8446#section-5. +// +// The record layer is responsible for encrypting/decrypting bytes to be +// sent over the wire, including stateful management of sequence numbers +// for the incoming and outgoing stream. +// +// The main interface is the RecordLayer class, which takes a callback function +// sending data and can be used like so: +// +// rl = new RecordLayer(async function send_encrypted_data(data) { +// // application-specific sending logic here. +// }); +// +// // Records are sent and received in plaintext by default, +// // until you specify the key to use. +// await rl.setSendKey(key) +// +// // Send some data by specifying the record type and the bytes. +// // Where allowed by the record type, it will be buffered until +// // explicitly flushed, and then sent by calling the callback. +// await rl.send(RECORD_TYPE.HANDSHAKE, <bytes for a handshake message>) +// await rl.send(RECORD_TYPE.HANDSHAKE, <bytes for another handshake message>) +// await rl.flush() +// +// // Separate keys are used for sending and receiving. +// rl.setRecvKey(key); +// +// // When data is received, push it into the RecordLayer +// // and pass a callback that will be called with a [type, bytes] +// // pair for each message parsed from the data. +// rl.recv(dataReceivedFromPeer, async (type, bytes) => { +// switch (type) { +// case RECORD_TYPE.APPLICATION_DATA: +// // do something with application data +// case RECORD_TYPE.HANDSHAKE: +// // do something with a handshake message +// default: +// // etc... +// } +// }); +// + + + + + + + +/* eslint-disable sorting/sort-object-props */ +const RECORD_TYPE = { + CHANGE_CIPHER_SPEC: 20, + ALERT: 21, + HANDSHAKE: 22, + APPLICATION_DATA: 23, +}; +/* eslint-enable sorting/sort-object-props */ + +// Encrypting at most 2^24 records will force us to stay +// below data limits on AES-GCM encryption key use, and also +// means we can accurately represent the sequence number as +// a javascript double. +const MAX_SEQUENCE_NUMBER = Math.pow(2, 24); +const MAX_RECORD_SIZE = Math.pow(2, 14); +const MAX_ENCRYPTED_RECORD_SIZE = MAX_RECORD_SIZE + 256; +const RECORD_HEADER_SIZE = 5; + +// These are some helper classes to manage the encryption/decryption state +// for a particular key. + +class recordlayer_CipherState { + constructor(key, iv) { + this.key = key; + this.iv = iv; + this.seqnum = 0; + } + + static async create(baseKey, mode) { + // Derive key and iv per https://tools.ietf.org/html/rfc8446#section-7.3 + const key = await prepareKey(await hkdfExpandLabel(baseKey, 'key', EMPTY, KEY_LENGTH), mode); + const iv = await hkdfExpandLabel(baseKey, 'iv', EMPTY, IV_LENGTH); + return new this(key, iv); + } + + nonce() { + // Ref https://tools.ietf.org/html/rfc8446#section-5.3: + // * left-pad the sequence number with zeros to IV_LENGTH + // * xor with the provided iv + // Our sequence numbers are always less than 2^24, so fit in a Uint32 + // in the last 4 bytes of the nonce. + const nonce = this.iv.slice(); + const dv = new DataView(nonce.buffer, nonce.byteLength - 4, 4); + dv.setUint32(0, dv.getUint32(0) ^ this.seqnum); + this.seqnum += 1; + if (this.seqnum > MAX_SEQUENCE_NUMBER) { + throw new TLSError(ALERT_DESCRIPTION.INTERNAL_ERROR); + } + return nonce; + } +} + +class recordlayer_EncryptionState extends recordlayer_CipherState { + static async create(key) { + return super.create(key, 'encrypt'); + } + + async encrypt(plaintext, additionalData) { + return await encrypt(this.key, this.nonce(), plaintext, additionalData); + } +} + +class recordlayer_DecryptionState extends recordlayer_CipherState { + static async create(key) { + return super.create(key, 'decrypt'); + } + + async decrypt(ciphertext, additionalData) { + return await decrypt(this.key, this.nonce(), ciphertext, additionalData); + } +} + +// The main RecordLayer class. + +class recordlayer_RecordLayer { + constructor(sendCallback) { + this.sendCallback = sendCallback; + this._sendEncryptState = null; + this._sendError = null; + this._recvDecryptState = null; + this._recvError = null; + this._pendingRecordType = 0; + this._pendingRecordBuf = null; + } + + async setSendKey(key) { + await this.flush(); + this._sendEncryptState = await recordlayer_EncryptionState.create(key); + } + + async setRecvKey(key) { + this._recvDecryptState = await recordlayer_DecryptionState.create(key); + } + + async setSendError(err) { + this._sendError = err; + } + + async setRecvError(err) { + this._recvError = err; + } + + async send(type, data) { + if (this._sendError !== null) { + throw this._sendError; + } + // Forbid sending data that doesn't fit into a single record. + // We do not support fragmentation over multiple records. + if (data.byteLength > MAX_RECORD_SIZE) { + throw new TLSError(ALERT_DESCRIPTION.INTERNAL_ERROR); + } + // Flush if we're switching to a different record type. + if (this._pendingRecordType && this._pendingRecordType !== type) { + await this.flush(); + } + // Flush if we would overflow the max size of a record. + if (this._pendingRecordBuf !== null) { + if (this._pendingRecordBuf.tell() + data.byteLength > MAX_RECORD_SIZE) { + await this.flush(); + } + } + // Start a new pending record if necessary. + // We reserve space at the start of the buffer for the record header, + // which is conveniently always a fixed size. + if (this._pendingRecordBuf === null) { + this._pendingRecordType = type; + this._pendingRecordBuf = new utils_BufferWriter(); + this._pendingRecordBuf.incr(RECORD_HEADER_SIZE); + } + this._pendingRecordBuf.writeBytes(data); + } + + async flush() { + // If there's nothing to flush, bail out early. + // Don't throw `_sendError` if we're not sending anything, because `flush()` + // can be called when we're trying to transition into an error state. + const buf = this._pendingRecordBuf; + let type = this._pendingRecordType; + if (! type) { + if (buf !== null) { + throw new TLSError(ALERT_DESCRIPTION.INTERNAL_ERROR); + } + return; + } + if (this._sendError !== null) { + throw this._sendError; + } + // If we're encrypting, turn the existing buffer contents into a `TLSInnerPlaintext` by + // appending the type. We don't do any zero-padding, although the spec allows it. + let inflation = 0, innerPlaintext = null; + if (this._sendEncryptState !== null) { + buf.writeUint8(type); + innerPlaintext = buf.slice(RECORD_HEADER_SIZE); + inflation = AEAD_SIZE_INFLATION; + type = RECORD_TYPE.APPLICATION_DATA; + } + // Write the common header for either `TLSPlaintext` or `TLSCiphertext` record. + const length = buf.tell() - RECORD_HEADER_SIZE + inflation; + buf.seek(0); + buf.writeUint8(type); + buf.writeUint16(VERSION_TLS_1_2); + buf.writeUint16(length); + // Followed by different payload depending on encryption status. + if (this._sendEncryptState !== null) { + const additionalData = buf.slice(0, RECORD_HEADER_SIZE); + const ciphertext = await this._sendEncryptState.encrypt(innerPlaintext, additionalData); + buf.writeBytes(ciphertext); + } else { + buf.incr(length); + } + this._pendingRecordBuf = null; + this._pendingRecordType = 0; + await this.sendCallback(buf.flush()); + } + + async recv(data) { + if (this._recvError !== null) { + throw this._recvError; + } + // For simplicity, we assume that the given data contains exactly one record. + // Peers using this library will send one record at a time over the websocket + // connection, and we can assume that the server-side websocket bridge will split + // up any traffic into individual records if we ever start interoperating with + // peers using a different TLS implementation. + // Similarly, we assume that handshake messages will not be fragmented across + // multiple records. This should be trivially true for the PSK-only mode used + // by this library, but we may want to relax it in future for interoperability + // with e.g. large ClientHello messages that contain lots of different options. + const buf = new utils_BufferReader(data); + // The data to read is either a TLSPlaintext or TLSCiphertext struct, + // depending on whether record protection has been enabled yet: + // + // struct { + // ContentType type; + // ProtocolVersion legacy_record_version; + // uint16 length; + // opaque fragment[TLSPlaintext.length]; + // } TLSPlaintext; + // + // struct { + // ContentType opaque_type = application_data; /* 23 */ + // ProtocolVersion legacy_record_version = 0x0303; /* TLS v1.2 */ + // uint16 length; + // opaque encrypted_record[TLSCiphertext.length]; + // } TLSCiphertext; + // + let type = buf.readUint8(); + // The spec says legacy_record_version "MUST be ignored for all purposes", + // but we know TLS1.3 implementations will only ever emit two possible values, + // so it seems useful to bail out early if we receive anything else. + const version = buf.readUint16(); + if (version !== VERSION_TLS_1_2) { + // TLS1.0 is only acceptable on initial plaintext records. + if (this._recvDecryptState !== null || version !== VERSION_TLS_1_0) { + throw new TLSError(ALERT_DESCRIPTION.DECODE_ERROR); + } + } + const length = buf.readUint16(); + let plaintext; + if (this._recvDecryptState === null || type === RECORD_TYPE.CHANGE_CIPHER_SPEC) { + [type, plaintext] = await this._readPlaintextRecord(type, length, buf); + } else { + [type, plaintext] = await this._readEncryptedRecord(type, length, buf); + } + // Sanity-check that we received exactly one record. + if (buf.hasMoreBytes()) { + throw new TLSError(ALERT_DESCRIPTION.DECODE_ERROR); + } + return [type, plaintext]; + } + + // Helper to read an unencrypted `TLSPlaintext` struct + + async _readPlaintextRecord(type, length, buf) { + if (length > MAX_RECORD_SIZE) { + throw new TLSError(ALERT_DESCRIPTION.RECORD_OVERFLOW); + } + return [type, buf.readBytes(length)]; + } + + // Helper to read an encrypted `TLSCiphertext` struct, + // decrypting it into plaintext. + + async _readEncryptedRecord(type, length, buf) { + if (length > MAX_ENCRYPTED_RECORD_SIZE) { + throw new TLSError(ALERT_DESCRIPTION.RECORD_OVERFLOW); + } + // The outer type for encrypted records is always APPLICATION_DATA. + if (type !== RECORD_TYPE.APPLICATION_DATA) { + throw new TLSError(ALERT_DESCRIPTION.DECODE_ERROR); + } + // Decrypt and decode the contained `TLSInnerPlaintext` struct: + // + // struct { + // opaque content[TLSPlaintext.length]; + // ContentType type; + // uint8 zeros[length_of_padding]; + // } TLSInnerPlaintext; + // + // The additional data for the decryption is the `TLSCiphertext` record + // header, which is a fixed size and immediately prior to current buffer position. + buf.incr(-RECORD_HEADER_SIZE); + const additionalData = buf.readBytes(RECORD_HEADER_SIZE); + const ciphertext = buf.readBytes(length); + const paddedPlaintext = await this._recvDecryptState.decrypt(ciphertext, additionalData); + // We have to scan backwards over the zero padding at the end of the struct + // in order to find the non-zero `type` byte. + let i; + for (i = paddedPlaintext.byteLength - 1; i >= 0; i--) { + if (paddedPlaintext[i] !== 0) { + break; + } + } + if (i < 0) { + throw new TLSError(ALERT_DESCRIPTION.UNEXPECTED_MESSAGE); + } + type = paddedPlaintext[i]; + // `change_cipher_spec` records must always be plaintext. + if (type === RECORD_TYPE.CHANGE_CIPHER_SPEC) { + throw new TLSError(ALERT_DESCRIPTION.DECODE_ERROR); + } + return [type, paddedPlaintext.slice(0, i)]; + } +} + +// CONCATENATED MODULE: ./src/tlsconnection.js +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +// The top-level APIs offered by this module are `ClientConnection` and +// `ServerConnection` classes, which provide authenticated and encrypted +// communication via the "externally-provisioned PSK" mode of TLS1.3. +// They each take a callback to be used for sending data to the remote peer, +// and operate like this: +// +// conn = await ClientConnection.create(psk, pskId, async function send_data_to_server(data) { +// // application-specific sending logic here. +// }) +// +// // Send data to the server by calling `send`, +// // which will use the callback provided in the constructor. +// // A single `send()` by the application may result in multiple +// // invokations of the callback. +// +// await conn.send('application-level data') +// +// // When data is received from the server, push it into +// // the connection and let it return any decrypted app-level data. +// // There might not be any app-level data if it was a protocol control +// // message, and the receipt of the data might trigger additional calls +// // to the send callback for protocol control purposes. +// +// serverSocket.on('data', async encrypted_data => { +// const plaintext = await conn.recv(data) +// if (plaintext !== null) { +// do_something_with_app_level_data(plaintext) +// } +// }) +// +// // It's good practice to explicitly close the connection +// // when finished. This will send a "closed" notification +// // to the server. +// +// await conn.close() +// +// // When the peer sends a "closed" notification it will show up +// // as a `TLSCloseNotify` exception from recv: +// +// try { +// data = await conn.recv(data); +// } catch (err) { +// if (! (err instanceof TLSCloseNotify) { throw err } +// do_something_to_cleanly_close_data_connection(); +// } +// +// The `ServerConnection` API operates similarly; the distinction is mainly +// in which side is expected to send vs receieve during the protocol handshake. + + + + + + + + + + +class tlsconnection_Connection { + constructor(psk, pskId, sendCallback) { + this.psk = assertIsBytes(psk); + this.pskId = assertIsBytes(pskId); + this.connected = new Promise((resolve, reject) => { + this._onConnectionSuccess = resolve; + this._onConnectionFailure = reject; + }); + this._state = new UNINITIALIZED(this); + this._handshakeRecvBuffer = null; + this._hasSeenChangeCipherSpec = false; + this._recordlayer = new recordlayer_RecordLayer(sendCallback); + this._keyschedule = new keyschedule_KeySchedule(); + this._lastPromise = Promise.resolve(); + } + + // Subclasses will override this with some async initialization logic. + static async create(psk, pskId, sendCallback) { + return new this(psk, pskId, sendCallback); + } + + // These are the three public API methods that consumers can use + // to send and receive data encrypted with TLS1.3. + + async send(data) { + assertIsBytes(data); + await this.connected; + await this._synchronized(async () => { + await this._state.sendApplicationData(data); + }); + } + + async recv(data) { + assertIsBytes(data); + return await this._synchronized(async () => { + // Decrypt the data using the record layer. + // We expect to receive precisely one record at a time. + const [type, bytes] = await this._recordlayer.recv(data); + // Dispatch based on the type of the record. + switch (type) { + case RECORD_TYPE.CHANGE_CIPHER_SPEC: + await this._state.recvChangeCipherSpec(bytes); + return null; + case RECORD_TYPE.ALERT: + await this._state.recvAlertMessage(TLSAlert.fromBytes(bytes)); + return null; + case RECORD_TYPE.APPLICATION_DATA: + return await this._state.recvApplicationData(bytes); + case RECORD_TYPE.HANDSHAKE: + // Multiple handshake messages may be coalesced into a single record. + // Store the in-progress record buffer on `this` so that we can guard + // against handshake messages that span a change in keys. + this._handshakeRecvBuffer = new utils_BufferReader(bytes); + if (! this._handshakeRecvBuffer.hasMoreBytes()) { + throw new TLSError(ALERT_DESCRIPTION.UNEXPECTED_MESSAGE); + } + do { + // Each handshake messages has a type and length prefix, per + // https://tools.ietf.org/html/rfc8446#appendix-B.3 + this._handshakeRecvBuffer.incr(1); + const mlength = this._handshakeRecvBuffer.readUint24(); + this._handshakeRecvBuffer.incr(-4); + const messageBytes = this._handshakeRecvBuffer.readBytes(mlength + 4); + this._keyschedule.addToTranscript(messageBytes); + await this._state.recvHandshakeMessage(messages_HandshakeMessage.fromBytes(messageBytes)); + } while (this._handshakeRecvBuffer.hasMoreBytes()); + this._handshakeRecvBuffer = null; + return null; + default: + throw new TLSError(ALERT_DESCRIPTION.UNEXPECTED_MESSAGE); + } + }); + } + + async close() { + await this._synchronized(async () => { + await this._state.close(); + }); + } + + // Ensure that async functions execute one at a time, + // by waiting for the previous call to `_synchronized()` to complete + // before starting a new one. This helps ensure that we complete + // one state-machine transition before starting to do the next. + // It's also a convenient place to catch and alert on errors. + + _synchronized(cb) { + const nextPromise = this._lastPromise.then(() => { + return cb(); + }).catch(async err => { + if (err instanceof TLSCloseNotify) { + throw err; + } + await this._state.handleErrorAndRethrow(err); + }); + // We don't want to hold on to the return value or error, + // just synchronize on the fact that it completed. + this._lastPromise = nextPromise.then(noop, noop); + return nextPromise; + } + + // This drives internal transition of the state-machine, + // ensuring that the new state is properly initialized. + + async _transition(State, ...args) { + this._state = new State(this); + await this._state.initialize(...args); + await this._recordlayer.flush(); + } + + // These are helpers to allow the State to manipulate the recordlayer + // and send out various types of data. + + async _sendApplicationData(bytes) { + await this._recordlayer.send(RECORD_TYPE.APPLICATION_DATA, bytes); + await this._recordlayer.flush(); + } + + async _sendHandshakeMessage(msg) { + await this._sendHandshakeMessageBytes(msg.toBytes()); + } + + async _sendHandshakeMessageBytes(bytes) { + this._keyschedule.addToTranscript(bytes); + await this._recordlayer.send(RECORD_TYPE.HANDSHAKE, bytes); + // Don't flush after each handshake message, since we can probably + // coalesce multiple messages into a single record. + } + + async _sendAlertMessage(err) { + await this._recordlayer.send(RECORD_TYPE.ALERT, err.toBytes()); + await this._recordlayer.flush(); + } + + async _sendChangeCipherSpec() { + await this._recordlayer.send(RECORD_TYPE.CHANGE_CIPHER_SPEC, new Uint8Array([0x01])); + await this._recordlayer.flush(); + } + + async _setSendKey(key) { + return await this._recordlayer.setSendKey(key); + } + + async _setRecvKey(key) { + // Handshake messages that change keys must be on a record boundary. + if (this._handshakeRecvBuffer && this._handshakeRecvBuffer.hasMoreBytes()) { + throw new TLSError(ALERT_DESCRIPTION.UNEXPECTED_MESSAGE); + } + return await this._recordlayer.setRecvKey(key); + } + + _setConnectionSuccess() { + if (this._onConnectionSuccess !== null) { + this._onConnectionSuccess(); + this._onConnectionSuccess = null; + this._onConnectionFailure = null; + } + } + + _setConnectionFailure(err) { + if (this._onConnectionFailure !== null) { + this._onConnectionFailure(err); + this._onConnectionSuccess = null; + this._onConnectionFailure = null; + } + } + + _closeForSend(alert) { + this._recordlayer.setSendError(alert); + } + + _closeForRecv(alert) { + this._recordlayer.setRecvError(alert); + } +} + +class tlsconnection_ClientConnection extends tlsconnection_Connection { + static async create(psk, pskId, sendCallback) { + const instance = await super.create(psk, pskId, sendCallback); + await instance._transition(states_CLIENT_START); + return instance; + } +} + +class tlsconnection_ServerConnection extends tlsconnection_Connection { + static async create(psk, pskId, sendCallback) { + const instance = await super.create(psk, pskId, sendCallback); + await instance._transition(states_SERVER_START); + return instance; + } +} + +// CONCATENATED MODULE: ./node_modules/event-target-shim/dist/event-target-shim.mjs +/** + * @author Toru Nagashima <https://github.com/mysticatea> + * @copyright 2015 Toru Nagashima. All rights reserved. + * See LICENSE file in root directory for full license. + */ +/** + * @typedef {object} PrivateData + * @property {EventTarget} eventTarget The event target. + * @property {{type:string}} event The original event object. + * @property {number} eventPhase The current event phase. + * @property {EventTarget|null} currentTarget The current event target. + * @property {boolean} canceled The flag to prevent default. + * @property {boolean} stopped The flag to stop propagation. + * @property {boolean} immediateStopped The flag to stop propagation immediately. + * @property {Function|null} passiveListener The listener if the current listener is passive. Otherwise this is null. + * @property {number} timeStamp The unix time. + * @private + */ + +/** + * Private data for event wrappers. + * @type {WeakMap<Event, PrivateData>} + * @private + */ +const privateData = new WeakMap(); + +/** + * Cache for wrapper classes. + * @type {WeakMap<Object, Function>} + * @private + */ +const wrappers = new WeakMap(); + +/** + * Get private data. + * @param {Event} event The event object to get private data. + * @returns {PrivateData} The private data of the event. + * @private + */ +function pd(event) { + const retv = privateData.get(event); + console.assert( + retv != null, + "'this' is expected an Event object, but got", + event + ); + return retv +} + +/** + * https://dom.spec.whatwg.org/#set-the-canceled-flag + * @param data {PrivateData} private data. + */ +function setCancelFlag(data) { + if (data.passiveListener != null) { + if ( + typeof console !== "undefined" && + typeof console.error === "function" + ) { + console.error( + "Unable to preventDefault inside passive event listener invocation.", + data.passiveListener + ); + } + return + } + if (!data.event.cancelable) { + return + } + + data.canceled = true; + if (typeof data.event.preventDefault === "function") { + data.event.preventDefault(); + } +} + +/** + * @see https://dom.spec.whatwg.org/#interface-event + * @private + */ +/** + * The event wrapper. + * @constructor + * @param {EventTarget} eventTarget The event target of this dispatching. + * @param {Event|{type:string}} event The original event to wrap. + */ +function Event(eventTarget, event) { + privateData.set(this, { + eventTarget, + event, + eventPhase: 2, + currentTarget: eventTarget, + canceled: false, + stopped: false, + immediateStopped: false, + passiveListener: null, + timeStamp: event.timeStamp || Date.now(), + }); + + // https://heycam.github.io/webidl/#Unforgeable + Object.defineProperty(this, "isTrusted", { value: false, enumerable: true }); + + // Define accessors + const keys = Object.keys(event); + for (let i = 0; i < keys.length; ++i) { + const key = keys[i]; + if (!(key in this)) { + Object.defineProperty(this, key, defineRedirectDescriptor(key)); + } + } +} + +// Should be enumerable, but class methods are not enumerable. +Event.prototype = { + /** + * The type of this event. + * @type {string} + */ + get type() { + return pd(this).event.type + }, + + /** + * The target of this event. + * @type {EventTarget} + */ + get target() { + return pd(this).eventTarget + }, + + /** + * The target of this event. + * @type {EventTarget} + */ + get currentTarget() { + return pd(this).currentTarget + }, + + /** + * @returns {EventTarget[]} The composed path of this event. + */ + composedPath() { + const currentTarget = pd(this).currentTarget; + if (currentTarget == null) { + return [] + } + return [currentTarget] + }, + + /** + * Constant of NONE. + * @type {number} + */ + get NONE() { + return 0 + }, + + /** + * Constant of CAPTURING_PHASE. + * @type {number} + */ + get CAPTURING_PHASE() { + return 1 + }, + + /** + * Constant of AT_TARGET. + * @type {number} + */ + get AT_TARGET() { + return 2 + }, + + /** + * Constant of BUBBLING_PHASE. + * @type {number} + */ + get BUBBLING_PHASE() { + return 3 + }, + + /** + * The target of this event. + * @type {number} + */ + get eventPhase() { + return pd(this).eventPhase + }, + + /** + * Stop event bubbling. + * @returns {void} + */ + stopPropagation() { + const data = pd(this); + + data.stopped = true; + if (typeof data.event.stopPropagation === "function") { + data.event.stopPropagation(); + } + }, + + /** + * Stop event bubbling. + * @returns {void} + */ + stopImmediatePropagation() { + const data = pd(this); + + data.stopped = true; + data.immediateStopped = true; + if (typeof data.event.stopImmediatePropagation === "function") { + data.event.stopImmediatePropagation(); + } + }, + + /** + * The flag to be bubbling. + * @type {boolean} + */ + get bubbles() { + return Boolean(pd(this).event.bubbles) + }, + + /** + * The flag to be cancelable. + * @type {boolean} + */ + get cancelable() { + return Boolean(pd(this).event.cancelable) + }, + + /** + * Cancel this event. + * @returns {void} + */ + preventDefault() { + setCancelFlag(pd(this)); + }, + + /** + * The flag to indicate cancellation state. + * @type {boolean} + */ + get defaultPrevented() { + return pd(this).canceled + }, + + /** + * The flag to be composed. + * @type {boolean} + */ + get composed() { + return Boolean(pd(this).event.composed) + }, + + /** + * The unix time of this event. + * @type {number} + */ + get timeStamp() { + return pd(this).timeStamp + }, + + /** + * The target of this event. + * @type {EventTarget} + * @deprecated + */ + get srcElement() { + return pd(this).eventTarget + }, + + /** + * The flag to stop event bubbling. + * @type {boolean} + * @deprecated + */ + get cancelBubble() { + return pd(this).stopped + }, + set cancelBubble(value) { + if (!value) { + return + } + const data = pd(this); + + data.stopped = true; + if (typeof data.event.cancelBubble === "boolean") { + data.event.cancelBubble = true; + } + }, + + /** + * The flag to indicate cancellation state. + * @type {boolean} + * @deprecated + */ + get returnValue() { + return !pd(this).canceled + }, + set returnValue(value) { + if (!value) { + setCancelFlag(pd(this)); + } + }, + + /** + * Initialize this event object. But do nothing under event dispatching. + * @param {string} type The event type. + * @param {boolean} [bubbles=false] The flag to be possible to bubble up. + * @param {boolean} [cancelable=false] The flag to be possible to cancel. + * @deprecated + */ + initEvent() { + // Do nothing. + }, +}; + +// `constructor` is not enumerable. +Object.defineProperty(Event.prototype, "constructor", { + value: Event, + configurable: true, + writable: true, +}); + +// Ensure `event instanceof window.Event` is `true`. +if (typeof window !== "undefined" && typeof window.Event !== "undefined") { + Object.setPrototypeOf(Event.prototype, window.Event.prototype); + + // Make association for wrappers. + wrappers.set(window.Event.prototype, Event); +} + +/** + * Get the property descriptor to redirect a given property. + * @param {string} key Property name to define property descriptor. + * @returns {PropertyDescriptor} The property descriptor to redirect the property. + * @private + */ +function defineRedirectDescriptor(key) { + return { + get() { + return pd(this).event[key] + }, + set(value) { + pd(this).event[key] = value; + }, + configurable: true, + enumerable: true, + } +} + +/** + * Get the property descriptor to call a given method property. + * @param {string} key Property name to define property descriptor. + * @returns {PropertyDescriptor} The property descriptor to call the method property. + * @private + */ +function defineCallDescriptor(key) { + return { + value() { + const event = pd(this).event; + return event[key].apply(event, arguments) + }, + configurable: true, + enumerable: true, + } +} + +/** + * Define new wrapper class. + * @param {Function} BaseEvent The base wrapper class. + * @param {Object} proto The prototype of the original event. + * @returns {Function} The defined wrapper class. + * @private + */ +function defineWrapper(BaseEvent, proto) { + const keys = Object.keys(proto); + if (keys.length === 0) { + return BaseEvent + } + + /** CustomEvent */ + function CustomEvent(eventTarget, event) { + BaseEvent.call(this, eventTarget, event); + } + + CustomEvent.prototype = Object.create(BaseEvent.prototype, { + constructor: { value: CustomEvent, configurable: true, writable: true }, + }); + + // Define accessors. + for (let i = 0; i < keys.length; ++i) { + const key = keys[i]; + if (!(key in BaseEvent.prototype)) { + const descriptor = Object.getOwnPropertyDescriptor(proto, key); + const isFunc = typeof descriptor.value === "function"; + Object.defineProperty( + CustomEvent.prototype, + key, + isFunc + ? defineCallDescriptor(key) + : defineRedirectDescriptor(key) + ); + } + } + + return CustomEvent +} + +/** + * Get the wrapper class of a given prototype. + * @param {Object} proto The prototype of the original event to get its wrapper. + * @returns {Function} The wrapper class. + * @private + */ +function getWrapper(proto) { + if (proto == null || proto === Object.prototype) { + return Event + } + + let wrapper = wrappers.get(proto); + if (wrapper == null) { + wrapper = defineWrapper(getWrapper(Object.getPrototypeOf(proto)), proto); + wrappers.set(proto, wrapper); + } + return wrapper +} + +/** + * Wrap a given event to management a dispatching. + * @param {EventTarget} eventTarget The event target of this dispatching. + * @param {Object} event The event to wrap. + * @returns {Event} The wrapper instance. + * @private + */ +function wrapEvent(eventTarget, event) { + const Wrapper = getWrapper(Object.getPrototypeOf(event)); + return new Wrapper(eventTarget, event) +} + +/** + * Get the immediateStopped flag of a given event. + * @param {Event} event The event to get. + * @returns {boolean} The flag to stop propagation immediately. + * @private + */ +function isStopped(event) { + return pd(event).immediateStopped +} + +/** + * Set the current event phase of a given event. + * @param {Event} event The event to set current target. + * @param {number} eventPhase New event phase. + * @returns {void} + * @private + */ +function setEventPhase(event, eventPhase) { + pd(event).eventPhase = eventPhase; +} + +/** + * Set the current target of a given event. + * @param {Event} event The event to set current target. + * @param {EventTarget|null} currentTarget New current target. + * @returns {void} + * @private + */ +function setCurrentTarget(event, currentTarget) { + pd(event).currentTarget = currentTarget; +} + +/** + * Set a passive listener of a given event. + * @param {Event} event The event to set current target. + * @param {Function|null} passiveListener New passive listener. + * @returns {void} + * @private + */ +function setPassiveListener(event, passiveListener) { + pd(event).passiveListener = passiveListener; +} + +/** + * @typedef {object} ListenerNode + * @property {Function} listener + * @property {1|2|3} listenerType + * @property {boolean} passive + * @property {boolean} once + * @property {ListenerNode|null} next + * @private + */ + +/** + * @type {WeakMap<object, Map<string, ListenerNode>>} + * @private + */ +const listenersMap = new WeakMap(); + +// Listener types +const CAPTURE = 1; +const BUBBLE = 2; +const ATTRIBUTE = 3; + +/** + * Check whether a given value is an object or not. + * @param {any} x The value to check. + * @returns {boolean} `true` if the value is an object. + */ +function isObject(x) { + return x !== null && typeof x === "object" //eslint-disable-line no-restricted-syntax +} + +/** + * Get listeners. + * @param {EventTarget} eventTarget The event target to get. + * @returns {Map<string, ListenerNode>} The listeners. + * @private + */ +function getListeners(eventTarget) { + const listeners = listenersMap.get(eventTarget); + if (listeners == null) { + throw new TypeError( + "'this' is expected an EventTarget object, but got another value." + ) + } + return listeners +} + +/** + * Get the property descriptor for the event attribute of a given event. + * @param {string} eventName The event name to get property descriptor. + * @returns {PropertyDescriptor} The property descriptor. + * @private + */ +function defineEventAttributeDescriptor(eventName) { + return { + get() { + const listeners = getListeners(this); + let node = listeners.get(eventName); + while (node != null) { + if (node.listenerType === ATTRIBUTE) { + return node.listener + } + node = node.next; + } + return null + }, + + set(listener) { + if (typeof listener !== "function" && !isObject(listener)) { + listener = null; // eslint-disable-line no-param-reassign + } + const listeners = getListeners(this); + + // Traverse to the tail while removing old value. + let prev = null; + let node = listeners.get(eventName); + while (node != null) { + if (node.listenerType === ATTRIBUTE) { + // Remove old value. + if (prev !== null) { + prev.next = node.next; + } else if (node.next !== null) { + listeners.set(eventName, node.next); + } else { + listeners.delete(eventName); + } + } else { + prev = node; + } + + node = node.next; + } + + // Add new value. + if (listener !== null) { + const newNode = { + listener, + listenerType: ATTRIBUTE, + passive: false, + once: false, + next: null, + }; + if (prev === null) { + listeners.set(eventName, newNode); + } else { + prev.next = newNode; + } + } + }, + configurable: true, + enumerable: true, + } +} + +/** + * Define an event attribute (e.g. `eventTarget.onclick`). + * @param {Object} eventTargetPrototype The event target prototype to define an event attrbite. + * @param {string} eventName The event name to define. + * @returns {void} + */ +function defineEventAttribute(eventTargetPrototype, eventName) { + Object.defineProperty( + eventTargetPrototype, + `on${eventName}`, + defineEventAttributeDescriptor(eventName) + ); +} + +/** + * Define a custom EventTarget with event attributes. + * @param {string[]} eventNames Event names for event attributes. + * @returns {EventTarget} The custom EventTarget. + * @private + */ +function defineCustomEventTarget(eventNames) { + /** CustomEventTarget */ + function CustomEventTarget() { + EventTarget.call(this); + } + + CustomEventTarget.prototype = Object.create(EventTarget.prototype, { + constructor: { + value: CustomEventTarget, + configurable: true, + writable: true, + }, + }); + + for (let i = 0; i < eventNames.length; ++i) { + defineEventAttribute(CustomEventTarget.prototype, eventNames[i]); + } + + return CustomEventTarget +} + +/** + * EventTarget. + * + * - This is constructor if no arguments. + * - This is a function which returns a CustomEventTarget constructor if there are arguments. + * + * For example: + * + * class A extends EventTarget {} + * class B extends EventTarget("message") {} + * class C extends EventTarget("message", "error") {} + * class D extends EventTarget(["message", "error"]) {} + */ +function EventTarget() { + /*eslint-disable consistent-return */ + if (this instanceof EventTarget) { + listenersMap.set(this, new Map()); + return + } + if (arguments.length === 1 && Array.isArray(arguments[0])) { + return defineCustomEventTarget(arguments[0]) + } + if (arguments.length > 0) { + const types = new Array(arguments.length); + for (let i = 0; i < arguments.length; ++i) { + types[i] = arguments[i]; + } + return defineCustomEventTarget(types) + } + throw new TypeError("Cannot call a class as a function") + /*eslint-enable consistent-return */ +} + +// Should be enumerable, but class methods are not enumerable. +EventTarget.prototype = { + /** + * Add a given listener to this event target. + * @param {string} eventName The event name to add. + * @param {Function} listener The listener to add. + * @param {boolean|{capture?:boolean,passive?:boolean,once?:boolean}} [options] The options for this listener. + * @returns {void} + */ + addEventListener(eventName, listener, options) { + if (listener == null) { + return + } + if (typeof listener !== "function" && !isObject(listener)) { + throw new TypeError("'listener' should be a function or an object.") + } + + const listeners = getListeners(this); + const optionsIsObj = isObject(options); + const capture = optionsIsObj + ? Boolean(options.capture) + : Boolean(options); + const listenerType = capture ? CAPTURE : BUBBLE; + const newNode = { + listener, + listenerType, + passive: optionsIsObj && Boolean(options.passive), + once: optionsIsObj && Boolean(options.once), + next: null, + }; + + // Set it as the first node if the first node is null. + let node = listeners.get(eventName); + if (node === undefined) { + listeners.set(eventName, newNode); + return + } + + // Traverse to the tail while checking duplication.. + let prev = null; + while (node != null) { + if ( + node.listener === listener && + node.listenerType === listenerType + ) { + // Should ignore duplication. + return + } + prev = node; + node = node.next; + } + + // Add it. + prev.next = newNode; + }, + + /** + * Remove a given listener from this event target. + * @param {string} eventName The event name to remove. + * @param {Function} listener The listener to remove. + * @param {boolean|{capture?:boolean,passive?:boolean,once?:boolean}} [options] The options for this listener. + * @returns {void} + */ + removeEventListener(eventName, listener, options) { + if (listener == null) { + return + } + + const listeners = getListeners(this); + const capture = isObject(options) + ? Boolean(options.capture) + : Boolean(options); + const listenerType = capture ? CAPTURE : BUBBLE; + + let prev = null; + let node = listeners.get(eventName); + while (node != null) { + if ( + node.listener === listener && + node.listenerType === listenerType + ) { + if (prev !== null) { + prev.next = node.next; + } else if (node.next !== null) { + listeners.set(eventName, node.next); + } else { + listeners.delete(eventName); + } + return + } + + prev = node; + node = node.next; + } + }, + + /** + * Dispatch a given event. + * @param {Event|{type:string}} event The event to dispatch. + * @returns {boolean} `false` if canceled. + */ + dispatchEvent(event) { + if (event == null || typeof event.type !== "string") { + throw new TypeError('"event.type" should be a string.') + } + + // If listeners aren't registered, terminate. + const listeners = getListeners(this); + const eventName = event.type; + let node = listeners.get(eventName); + if (node == null) { + return true + } + + // Since we cannot rewrite several properties, so wrap object. + const wrappedEvent = wrapEvent(this, event); + + // This doesn't process capturing phase and bubbling phase. + // This isn't participating in a tree. + let prev = null; + while (node != null) { + // Remove this listener if it's once + if (node.once) { + if (prev !== null) { + prev.next = node.next; + } else if (node.next !== null) { + listeners.set(eventName, node.next); + } else { + listeners.delete(eventName); + } + } else { + prev = node; + } + + // Call this listener + setPassiveListener( + wrappedEvent, + node.passive ? node.listener : null + ); + if (typeof node.listener === "function") { + try { + node.listener.call(this, wrappedEvent); + } catch (err) { + if ( + typeof console !== "undefined" && + typeof console.error === "function" + ) { + console.error(err); + } + } + } else if ( + node.listenerType !== ATTRIBUTE && + typeof node.listener.handleEvent === "function" + ) { + node.listener.handleEvent(wrappedEvent); + } + + // Break if `event.stopImmediatePropagation` was called. + if (isStopped(wrappedEvent)) { + break + } + + node = node.next; + } + setPassiveListener(wrappedEvent, null); + setEventPhase(wrappedEvent, 0); + setCurrentTarget(wrappedEvent, null); + + return !wrappedEvent.defaultPrevented + }, +}; + +// `constructor` is not enumerable. +Object.defineProperty(EventTarget.prototype, "constructor", { + value: EventTarget, + configurable: true, + writable: true, +}); + +// Ensure `eventTarget instanceof window.EventTarget` is `true`. +if ( + typeof window !== "undefined" && + typeof window.EventTarget !== "undefined" +) { + Object.setPrototypeOf(EventTarget.prototype, window.EventTarget.prototype); +} + +/* harmony default export */ var event_target_shim = (EventTarget); + + +// CONCATENATED MODULE: ./src/index.js +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +// A wrapper that combines a WebSocket to the channelserver +// with some client-side encryption for securing the channel. +// +// This code is responsible for the event handling and the consumer API. +// All the details of encrypting the messages are delegated to`./tlsconnection.js`. + + + + + + + +const CLOSE_FLUSH_BUFFER_INTERVAL_MS = 200; +const CLOSE_FLUSH_BUFFER_MAX_TRIES = 5; + +class src_PairingChannel extends EventTarget { + constructor(channelId, channelKey, socket, connection) { + super(); + this._channelId = channelId; + this._channelKey = channelKey; + this._socket = socket; + this._connection = connection; + this._selfClosed = false; + this._peerClosed = false; + this._setupListeners(); + } + + /** + * Create a new pairing channel. + * + * This will open a channel on the channelserver, and generate a random client-side + * encryption key. When the promise resolves, `this.channelId` and `this.channelKey` + * can be transferred to another client to allow it to securely connect to the channel. + * + * @returns Promise<PairingChannel> + */ + static create(channelServerURI) { + const wsURI = new URL('/v1/ws/', channelServerURI).href; + const channelKey = crypto.getRandomValues(new Uint8Array(32)); + // The one who creates the channel plays the role of 'server' in the underlying TLS exchange. + return this._makePairingChannel(wsURI, tlsconnection_ServerConnection, channelKey); + } + + /** + * Connect to an existing pairing channel. + * + * This will connect to a channel on the channelserver previously established by + * another client calling `create`. The `channelId` and `channelKey` must have been + * obtained via some out-of-band mechanism (such as by scanning from a QR code). + * + * @returns Promise<PairingChannel> + */ + static connect(channelServerURI, channelId, channelKey) { + const wsURI = new URL(`/v1/ws/${channelId}`, channelServerURI).href; + // The one who connects to an existing channel plays the role of 'client' + // in the underlying TLS exchange. + return this._makePairingChannel(wsURI, tlsconnection_ClientConnection, channelKey); + } + + static _makePairingChannel(wsUri, ConnectionClass, psk) { + const socket = new WebSocket(wsUri); + return new Promise((resolve, reject) => { + // eslint-disable-next-line prefer-const + let stopListening; + const onConnectionError = async () => { + stopListening(); + reject(new Error('Error while creating the pairing channel')); + }; + const onFirstMessage = async event => { + stopListening(); + try { + // The channelserver echos back the channel id, and we use it as an + // additional input to the TLS handshake via the "psk id" field. + const {channelid: channelId} = JSON.parse(event.data); + const pskId = utf8ToBytes(channelId); + const connection = await ConnectionClass.create(psk, pskId, data => { + // Send data by forwarding it via the channelserver websocket. + // The TLS connection gives us `data` as raw bytes, but channelserver + // expects b64urlsafe strings, because it wraps them in a JSON object envelope. + socket.send(bytesToBase64url(data)); + }); + const instance = new this(channelId, psk, socket, connection); + resolve(instance); + } catch (err) { + reject(err); + } + }; + stopListening = () => { + socket.removeEventListener('close', onConnectionError); + socket.removeEventListener('error', onConnectionError); + socket.removeEventListener('message', onFirstMessage); + }; + socket.addEventListener('close', onConnectionError); + socket.addEventListener('error', onConnectionError); + socket.addEventListener('message', onFirstMessage); + }); + } + + _setupListeners() { + this._socket.addEventListener('message', async event => { + try { + // When we receive data from the channelserver, pump it through the TLS connection + // to decrypt it, then echo it back out to consumers as an event. + const channelServerEnvelope = JSON.parse(event.data); + const payload = await this._connection.recv(base64urlToBytes(channelServerEnvelope.message)); + if (payload !== null) { + const data = JSON.parse(bytesToUtf8(payload)); + this.dispatchEvent(new CustomEvent('message', { + detail: { + data, + sender: channelServerEnvelope.sender, + }, + })); + } + } catch (error) { + let event; + // The underlying TLS connection will signal a clean shutdown of the channel + // by throwing a special error, because it doesn't really have a better + // signally mechanism available. + if (error instanceof TLSCloseNotify) { + this._peerClosed = true; + if (this._selfClosed) { + this._shutdown(); + } + event = new CustomEvent('close'); + } else { + event = new CustomEvent('error', { + detail: { + error, + } + }); + } + this.dispatchEvent(event); + } + }); + // Relay the WebSocket events. + this._socket.addEventListener('error', () => { + this._shutdown(); + // The dispatched event that we receive has no useful information. + this.dispatchEvent(new CustomEvent('error', { + detail: { + error: new Error('WebSocket error.'), + }, + })); + }); + // In TLS, the peer has to explicitly send a close notification, + // which we dispatch above. Unexpected socket close is an error. + this._socket.addEventListener('close', () => { + this._shutdown(); + if (! this._peerClosed) { + this.dispatchEvent(new CustomEvent('error', { + detail: { + error: new Error('WebSocket unexpectedly closed'), + } + })); + } + }); + } + + /** + * @param {Object} data + */ + async send(data) { + const payload = utf8ToBytes(JSON.stringify(data)); + await this._connection.send(payload); + } + + async close() { + this._selfClosed = true; + await this._connection.close(); + try { + // Ensure all queued bytes have been sent before closing the connection. + let tries = 0; + while (this._socket.bufferedAmount > 0) { + if (++tries > CLOSE_FLUSH_BUFFER_MAX_TRIES) { + throw new Error('Could not flush the outgoing buffer in time.'); + } + await new Promise(res => setTimeout(res, CLOSE_FLUSH_BUFFER_INTERVAL_MS)); + } + } finally { + // If the peer hasn't closed, we might still receive some data. + if (this._peerClosed) { + this._shutdown(); + } + } + } + + _shutdown() { + if (this._socket) { + this._socket.close(); + this._socket = null; + this._connection = null; + } + } + + get closed() { + return (! this._socket) || (this._socket.readyState === 3); + } + + get channelId() { + return this._channelId; + } + + get channelKey() { + return this._channelKey; + } +} + +// Re-export helpful utilities for calling code to use. + + +// For running tests using the built bundle, +// expose a bunch of implementation details. + + + + + + + +const _internals = { + arrayToBytes: arrayToBytes, + BufferReader: utils_BufferReader, + BufferWriter: utils_BufferWriter, + bytesAreEqual: bytesAreEqual, + bytesToHex: bytesToHex, + bytesToUtf8: bytesToUtf8, + ClientConnection: tlsconnection_ClientConnection, + Connection: tlsconnection_Connection, + DecryptionState: recordlayer_DecryptionState, + EncryptedExtensions: EncryptedExtensions, + EncryptionState: recordlayer_EncryptionState, + Finished: messages_Finished, + HASH_LENGTH: HASH_LENGTH, + hexToBytes: hexToBytes, + hkdfExpand: hkdfExpand, + KeySchedule: keyschedule_KeySchedule, + NewSessionTicket: messages_NewSessionTicket, + RecordLayer: recordlayer_RecordLayer, + ServerConnection: tlsconnection_ServerConnection, + utf8ToBytes: utf8ToBytes, + zeros: zeros, +}; + + +/***/ }) +/******/ ])["PairingChannel"]; |