"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.ScramSHA256 = exports.ScramSHA1 = void 0;
const crypto = require("crypto");
const bson_1 = require("../../bson");
const deps_1 = require("../../deps");
const error_1 = require("../../error");
const utils_1 = require("../../utils");
const auth_provider_1 = require("./auth_provider");
const providers_1 = require("./providers");
class ScramSHA extends auth_provider_1.AuthProvider {
constructor(cryptoMethod) {
super();
this.cryptoMethod = cryptoMethod || 'sha1';
}
prepare(handshakeDoc, authContext, callback) {
const cryptoMethod = this.cryptoMethod;
const credentials = authContext.credentials;
if (!credentials) {
return callback(new error_1.MongoMissingCredentialsError('AuthContext must provide credentials.'));
}
if (cryptoMethod === 'sha256' && deps_1.saslprep == null) {
(0, utils_1.emitWarning)('Warning: no saslprep library specified. Passwords will not be sanitized');
}
crypto.randomBytes(24, (err, nonce) => {
if (err) {
return callback(err);
}
// store the nonce for later use
Object.assign(authContext, { nonce });
const request = Object.assign({}, handshakeDoc, {
speculativeAuthenticate: Object.assign(makeFirstMessage(cryptoMethod, credentials, nonce), {
db: credentials.source
})
});
callback(undefined, request);
});
}
auth(authContext, callback) {
const response = authContext.response;
if (response && response.speculativeAuthenticate) {
continueScramConversation(this.cryptoMethod, response.speculativeAuthenticate, authContext, callback);
return;
}
executeScram(this.cryptoMethod, authContext, callback);
}
}
function cleanUsername(username) {
return username.replace('=', '=3D').replace(',', '=2C');
}
function clientFirstMessageBare(username, nonce) {
// NOTE: This is done b/c Javascript uses UTF-16, but the server is hashing in UTF-8.
// Since the username is not sasl-prep-d, we need to do this here.
return Buffer.concat([
Buffer.from('n=', 'utf8'),
Buffer.from(username, 'utf8'),
Buffer.from(',r=', 'utf8'),
Buffer.from(nonce.toString('base64'), 'utf8')
]);
}
function makeFirstMessage(cryptoMethod, credentials, nonce) {
const username = cleanUsername(credentials.username);
const mechanism = cryptoMethod === 'sha1' ? providers_1.AuthMechanism.MONGODB_SCRAM_SHA1 : providers_1.AuthMechanism.MONGODB_SCRAM_SHA256;
// NOTE: This is done b/c Javascript uses UTF-16, but the server is hashing in UTF-8.
// Since the username is not sasl-prep-d, we need to do this here.
return {
saslStart: 1,
mechanism,
payload: new bson_1.Binary(Buffer.concat([Buffer.from('n,,', 'utf8'), clientFirstMessageBare(username, nonce)])),
autoAuthorize: 1,
options: { skipEmptyExchange: true }
};
}
function executeScram(cryptoMethod, authContext, callback) {
const { connection, credentials } = authContext;
if (!credentials) {
return callback(new error_1.MongoMissingCredentialsError('AuthContext must provide credentials.'));
}
if (!authContext.nonce) {
return callback(new error_1.MongoInvalidArgumentError('AuthContext must contain a valid nonce property'));
}
const nonce = authContext.nonce;
const db = credentials.source;
const saslStartCmd = makeFirstMessage(cryptoMethod, credentials, nonce);
connection.command((0, utils_1.ns)(`${db}.$cmd`), saslStartCmd, undefined, (_err, result) => {
const err = resolveError(_err, result);
if (err) {
return callback(err);
}
continueScramConversation(cryptoMethod, result, authContext, callback);
});
}
function continueScramConversation(cryptoMethod, response, authContext, callback) {
const connection = authContext.connection;
const credentials = authContext.credentials;
if (!credentials) {
return callback(new error_1.MongoMissingCredentialsError('AuthContext must provide credentials.'));
}
if (!authContext.nonce) {
return callback(new error_1.MongoInvalidArgumentError('Unable to continue SCRAM without valid nonce'));
}
const nonce = authContext.nonce;
const db = credentials.source;
const username = cleanUsername(credentials.username);
const password = credentials.password;
let processedPassword;
if (cryptoMethod === 'sha256') {
processedPassword = 'kModuleError' in deps_1.saslprep ? password : (0, deps_1.saslprep)(password);
}
else {
try {
processedPassword = passwordDigest(username, password);
}
catch (e) {
return callback(e);
}
}
const payload = Buffer.isBuffer(response.payload)
? new bson_1.Binary(response.payload)
: response.payload;
const dict = parsePayload(payload.value());
const iterations = parseInt(dict.i, 10);
if (iterations && iterations < 4096) {
callback(
// TODO(NODE-3483)
new error_1.MongoRuntimeError(`Server returned an invalid iteration count ${iterations}`), false);
return;
}
const salt = dict.s;
const rnonce = dict.r;
if (rnonce.startsWith('nonce')) {
// TODO(NODE-3483)
callback(new error_1.MongoRuntimeError(`Server returned an invalid nonce: ${rnonce}`), false);
return;
}
// Set up start of proof
const withoutProof = `c=biws,r=${rnonce}`;
const saltedPassword = HI(processedPassword, Buffer.from(salt, 'base64'), iterations, cryptoMethod);
const clientKey = HMAC(cryptoMethod, saltedPassword, 'Client Key');
const serverKey = HMAC(cryptoMethod, saltedPassword, 'Server Key');
const storedKey = H(cryptoMethod, clientKey);
const authMessage = [clientFirstMessageBare(username, nonce), payload.value(), withoutProof].join(',');
const clientSignature = HMAC(cryptoMethod, storedKey, authMessage);
const clientProof = `p=${xor(clientKey, clientSignature)}`;
const clientFinal = [withoutProof, clientProof].join(',');
const serverSignature = HMAC(cryptoMethod, serverKey, authMessage);
const saslContinueCmd = {
saslContinue: 1,
conversationId: response.conversationId,
payload: new bson_1.Binary(Buffer.from(clientFinal))
};
connection.command((0, utils_1.ns)(`${db}.$cmd`), saslContinueCmd, undefined, (_err, r) => {
const err = resolveError(_err, r);
if (err) {
return callback(err);
}
const parsedResponse = parsePayload(r.payload.value());
if (!compareDigest(Buffer.from(parsedResponse.v, 'base64'), serverSignature)) {
callback(new error_1.MongoRuntimeError('Server returned an invalid signature'));
return;
}
if (!r || r.done !== false) {
return callback(err, r);
}
const retrySaslContinueCmd = {
saslContinue: 1,
conversationId: r.conversationId,
payload: Buffer.alloc(0)
};
connection.command((0, utils_1.ns)(`${db}.$cmd`), retrySaslContinueCmd, undefined, callback);
});
}
function parsePayload(payload) {
const dict = {};
const parts = payload.split(',');
for (let i = 0; i < parts.length; i++) {
const valueParts = parts[i].split('=');
dict[valueParts[0]] = valueParts[1];
}
return dict;
}
function passwordDigest(username, password) {
if (typeof username !== 'string') {
throw new error_1.MongoInvalidArgumentError('Username must be a string');
}
if (typeof password !== 'string') {
throw new error_1.MongoInvalidArgumentError('Password must be a string');
}
if (password.length === 0) {
throw new error_1.MongoInvalidArgumentError('Password cannot be empty');
}
let md5;
try {
md5 = crypto.createHash('md5');
}
catch (err) {
if (crypto.getFips()) {
// This error is (slightly) more helpful than what comes from OpenSSL directly, e.g.
// 'Error: error:060800C8:digital envelope routines:EVP_DigestInit_ex:disabled for FIPS'
throw new Error('Auth mechanism SCRAM-SHA-1 is not supported in FIPS mode');
}
throw err;
}
md5.update(`${username}:mongo:${password}`, 'utf8');
return md5.digest('hex');
}
// XOR two buffers
function xor(a, b) {
if (!Buffer.isBuffer(a)) {
a = Buffer.from(a);
}
if (!Buffer.isBuffer(b)) {
b = Buffer.from(b);
}
const length = Math.max(a.length, b.length);
const res = [];
for (let i = 0; i < length; i += 1) {
res.push(a[i] ^ b[i]);
}
return Buffer.from(res).toString('base64');
}
function H(method, text) {
return crypto.createHash(method).update(text).digest();
}
function HMAC(method, key, text) {
return crypto.createHmac(method, key).update(text).digest();
}
let _hiCache = {};
let _hiCacheCount = 0;
function _hiCachePurge() {
_hiCache = {};
_hiCacheCount = 0;
}
const hiLengthMap = {
sha256: 32,
sha1: 20
};
function HI(data, salt, iterations, cryptoMethod) {
// omit the work if already generated
const key = [data, salt.toString('base64'), iterations].join('_');
if (_hiCache[key] != null) {
return _hiCache[key];
}
// generate the salt
const saltedData = crypto.pbkdf2Sync(data, salt, iterations, hiLengthMap[cryptoMethod], cryptoMethod);
// cache a copy to speed up the next lookup, but prevent unbounded cache growth
if (_hiCacheCount >= 200) {
_hiCachePurge();
}
_hiCache[key] = saltedData;
_hiCacheCount += 1;
return saltedData;
}
function compareDigest(lhs, rhs) {
if (lhs.length !== rhs.length) {
return false;
}
if (typeof crypto.timingSafeEqual === 'function') {
return crypto.timingSafeEqual(lhs, rhs);
}
let result = 0;
for (let i = 0; i < lhs.length; i++) {
result |= lhs[i] ^ rhs[i];
}
return result === 0;
}
function resolveError(err, result) {
if (err)
return err;
if (result) {
if (result.$err || result.errmsg)
return new error_1.MongoServerError(result);
}
return;
}
class ScramSHA1 extends ScramSHA {
constructor() {
super('sha1');
}
}
exports.ScramSHA1 = ScramSHA1;
class ScramSHA256 extends ScramSHA {
constructor() {
super('sha256');
}
}
exports.ScramSHA256 = ScramSHA256;
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