@whiskeysockets/baileys
Version:
A WebSockets library for interacting with WhatsApp Web
201 lines • 7.9 kB
JavaScript
import { Boom } from '@hapi/boom';
import { proto } from '../../WAProto/index.js';
import { NOISE_MODE, WA_CERT_DETAILS } from '../Defaults/index.js';
import { decodeBinaryNode } from '../WABinary/index.js';
import { aesDecryptGCM, aesEncryptGCM, Curve, hkdf, sha256 } from './crypto.js';
const IV_LENGTH = 12;
const EMPTY_BUFFER = Buffer.alloc(0);
const generateIV = (counter) => {
const iv = new ArrayBuffer(IV_LENGTH);
new DataView(iv).setUint32(8, counter);
return new Uint8Array(iv);
};
class TransportState {
constructor(encKey, decKey) {
this.encKey = encKey;
this.decKey = decKey;
this.readCounter = 0;
this.writeCounter = 0;
this.iv = new Uint8Array(IV_LENGTH);
}
encrypt(plaintext) {
const c = this.writeCounter++;
this.iv[8] = (c >>> 24) & 0xff;
this.iv[9] = (c >>> 16) & 0xff;
this.iv[10] = (c >>> 8) & 0xff;
this.iv[11] = c & 0xff;
return aesEncryptGCM(plaintext, this.encKey, this.iv, EMPTY_BUFFER);
}
decrypt(ciphertext) {
const c = this.readCounter++;
this.iv[8] = (c >>> 24) & 0xff;
this.iv[9] = (c >>> 16) & 0xff;
this.iv[10] = (c >>> 8) & 0xff;
this.iv[11] = c & 0xff;
return aesDecryptGCM(ciphertext, this.decKey, this.iv, EMPTY_BUFFER);
}
}
export const makeNoiseHandler = ({ keyPair: { private: privateKey, public: publicKey }, NOISE_HEADER, logger, routingInfo }) => {
logger = logger.child({ class: 'ns' });
const data = Buffer.from(NOISE_MODE);
let hash = data.byteLength === 32 ? data : sha256(data);
let salt = hash;
let encKey = hash;
let decKey = hash;
let counter = 0;
let sentIntro = false;
let inBytes = Buffer.alloc(0);
let transport = null;
let isWaitingForTransport = false;
let pendingOnFrame = null;
let introHeader;
if (routingInfo) {
introHeader = Buffer.alloc(7 + routingInfo.byteLength + NOISE_HEADER.length);
introHeader.write('ED', 0, 'utf8');
introHeader.writeUint8(0, 2);
introHeader.writeUint8(1, 3);
introHeader.writeUint8(routingInfo.byteLength >> 16, 4);
introHeader.writeUint16BE(routingInfo.byteLength & 65535, 5);
introHeader.set(routingInfo, 7);
introHeader.set(NOISE_HEADER, 7 + routingInfo.byteLength);
}
else {
introHeader = Buffer.from(NOISE_HEADER);
}
const authenticate = (data) => {
if (!transport) {
hash = sha256(Buffer.concat([hash, data]));
}
};
const encrypt = (plaintext) => {
if (transport) {
return transport.encrypt(plaintext);
}
const result = aesEncryptGCM(plaintext, encKey, generateIV(counter++), hash);
authenticate(result);
return result;
};
const decrypt = (ciphertext) => {
if (transport) {
return transport.decrypt(ciphertext);
}
const result = aesDecryptGCM(ciphertext, decKey, generateIV(counter++), hash);
authenticate(ciphertext);
return result;
};
const localHKDF = (data) => {
const key = hkdf(Buffer.from(data), 64, { salt, info: '' });
return [key.subarray(0, 32), key.subarray(32)];
};
const mixIntoKey = (data) => {
const [write, read] = localHKDF(data);
salt = write;
encKey = read;
decKey = read;
counter = 0;
};
const finishInit = async () => {
isWaitingForTransport = true;
const [write, read] = localHKDF(new Uint8Array(0));
transport = new TransportState(write, read);
isWaitingForTransport = false;
logger.trace('Noise handler transitioned to Transport state');
if (pendingOnFrame) {
logger.trace({ length: inBytes.length }, 'Flushing buffered frames after transport ready');
await processData(pendingOnFrame);
pendingOnFrame = null;
}
};
const processData = async (onFrame) => {
let size;
while (true) {
if (inBytes.length < 3)
return;
size = (inBytes[0] << 16) | (inBytes[1] << 8) | inBytes[2];
if (inBytes.length < size + 3)
return;
let frame = inBytes.subarray(3, size + 3);
inBytes = inBytes.subarray(size + 3);
if (transport) {
const result = transport.decrypt(frame);
frame = await decodeBinaryNode(result);
}
if (logger.level === 'trace') {
logger.trace({ msg: frame?.attrs?.id }, 'recv frame');
}
onFrame(frame);
}
};
authenticate(NOISE_HEADER);
authenticate(publicKey);
return {
encrypt,
decrypt,
authenticate,
mixIntoKey,
finishInit,
processHandshake: ({ serverHello }, noiseKey) => {
authenticate(serverHello.ephemeral);
mixIntoKey(Curve.sharedKey(privateKey, serverHello.ephemeral));
const decStaticContent = decrypt(serverHello.static);
mixIntoKey(Curve.sharedKey(privateKey, decStaticContent));
const certDecoded = decrypt(serverHello.payload);
const { intermediate: certIntermediate, leaf } = proto.CertChain.decode(certDecoded);
// leaf
if (!leaf?.details || !leaf?.signature) {
throw new Boom('invalid noise leaf certificate', { statusCode: 400 });
}
if (!certIntermediate?.details || !certIntermediate?.signature) {
throw new Boom('invalid noise intermediate certificate', { statusCode: 400 });
}
const details = proto.CertChain.NoiseCertificate.Details.decode(certIntermediate.details);
const { issuerSerial } = details;
const verify = Curve.verify(details.key, leaf.details, leaf.signature);
const verifyIntermediate = Curve.verify(WA_CERT_DETAILS.PUBLIC_KEY, certIntermediate.details, certIntermediate.signature);
if (!verify) {
throw new Boom('noise certificate signature invalid', { statusCode: 400 });
}
if (!verifyIntermediate) {
throw new Boom('noise intermediate certificate signature invalid', { statusCode: 400 });
}
if (issuerSerial !== WA_CERT_DETAILS.SERIAL) {
throw new Boom('certification match failed', { statusCode: 400 });
}
const keyEnc = encrypt(noiseKey.public);
mixIntoKey(Curve.sharedKey(noiseKey.private, serverHello.ephemeral));
return keyEnc;
},
encodeFrame: (data) => {
if (transport) {
data = transport.encrypt(data);
}
const dataLen = data.byteLength;
const introSize = sentIntro ? 0 : introHeader.length;
const frame = Buffer.allocUnsafe(introSize + 3 + dataLen);
if (!sentIntro) {
frame.set(introHeader);
sentIntro = true;
}
frame[introSize] = (dataLen >>> 16) & 0xff;
frame[introSize + 1] = (dataLen >>> 8) & 0xff;
frame[introSize + 2] = dataLen & 0xff;
frame.set(data, introSize + 3);
return frame;
},
decodeFrame: async (newData, onFrame) => {
if (isWaitingForTransport) {
inBytes = Buffer.concat([inBytes, newData]);
pendingOnFrame = onFrame;
return;
}
if (inBytes.length === 0) {
inBytes = Buffer.from(newData);
}
else {
inBytes = Buffer.concat([inBytes, newData]);
}
await processData(onFrame);
}
};
};
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