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import * as net from 'net';
import type { ConnectionOptions as TLSConnectionOpts, TLSSocket } from 'tls';
import * as tls from 'tls';
import type { Document } from '../bson';
import { LEGACY_HELLO_COMMAND } from '../constants';
import { getSocks, type SocksLib } from '../deps';
import {
MongoCompatibilityError,
MongoError,
MongoErrorLabel,
MongoInvalidArgumentError,
MongoNetworkError,
MongoNetworkTimeoutError,
MongoRuntimeError,
needsRetryableWriteLabel
} from '../error';
import { HostAddress, ns, promiseWithResolvers } from '../utils';
import { AuthContext } from './auth/auth_provider';
import { AuthMechanism } from './auth/providers';
import {
type CommandOptions,
Connection,
type ConnectionOptions,
CryptoConnection
} from './connection';
import {
MAX_SUPPORTED_SERVER_VERSION,
MAX_SUPPORTED_WIRE_VERSION,
MIN_SUPPORTED_SERVER_VERSION,
MIN_SUPPORTED_WIRE_VERSION
} from './wire_protocol/constants';
/** @public */
export type Stream = Socket | TLSSocket;
export async function connect(options: ConnectionOptions): Promise<Connection> {
let connection: Connection | null = null;
try {
const socket = await makeSocket(options);
connection = makeConnection(options, socket);
await performInitialHandshake(connection, options);
return connection;
} catch (error) {
connection?.destroy();
throw error;
}
}
export function makeConnection(options: ConnectionOptions, socket: Stream): Connection {
let ConnectionType = options.connectionType ?? Connection;
if (options.autoEncrypter) {
ConnectionType = CryptoConnection;
}
return new ConnectionType(socket, options);
}
function checkSupportedServer(hello: Document, options: ConnectionOptions) {
const maxWireVersion = Number(hello.maxWireVersion);
const minWireVersion = Number(hello.minWireVersion);
const serverVersionHighEnough =
!Number.isNaN(maxWireVersion) && maxWireVersion >= MIN_SUPPORTED_WIRE_VERSION;
const serverVersionLowEnough =
!Number.isNaN(minWireVersion) && minWireVersion <= MAX_SUPPORTED_WIRE_VERSION;
if (serverVersionHighEnough) {
if (serverVersionLowEnough) {
return null;
}
const message = `Server at ${options.hostAddress} reports minimum wire version ${JSON.stringify(
hello.minWireVersion
)}, but this version of the Node.js Driver requires at most ${MAX_SUPPORTED_WIRE_VERSION} (MongoDB ${MAX_SUPPORTED_SERVER_VERSION})`;
return new MongoCompatibilityError(message);
}
const message = `Server at ${options.hostAddress} reports maximum wire version ${
JSON.stringify(hello.maxWireVersion) ?? 0
}, but this version of the Node.js Driver requires at least ${MIN_SUPPORTED_WIRE_VERSION} (MongoDB ${MIN_SUPPORTED_SERVER_VERSION})`;
return new MongoCompatibilityError(message);
}
export async function performInitialHandshake(
conn: Connection,
options: ConnectionOptions
): Promise<void> {
const credentials = options.credentials;
if (credentials) {
Iif (
!(credentials.mechanism === AuthMechanism.MONGODB_DEFAULT) &&
!options.authProviders.getOrCreateProvider(
credentials.mechanism,
credentials.mechanismProperties
)
) {
throw new MongoInvalidArgumentError(`AuthMechanism '${credentials.mechanism}' not supported`);
}
}
const authContext = new AuthContext(conn, credentials, options);
conn.authContext = authContext;
const handshakeDoc = await prepareHandshakeDocument(authContext);
// @ts-expect-error: TODO(NODE-5141): The options need to be filtered properly, Connection options differ from Command options
const handshakeOptions: CommandOptions = { ...options, raw: false };
if (typeof options.connectTimeoutMS === 'number') {
// The handshake technically is a monitoring check, so its socket timeout should be connectTimeoutMS
handshakeOptions.socketTimeoutMS = options.connectTimeoutMS;
}
const start = new Date().getTime();
const response = await executeHandshake(handshakeDoc, handshakeOptions);
if (!('isWritablePrimary' in response)) {
// Provide hello-style response document.
response.isWritablePrimary = response[LEGACY_HELLO_COMMAND];
}
if (response.helloOk) {
conn.helloOk = true;
}
const supportedServerErr = checkSupportedServer(response, options);
if (supportedServerErr) {
throw supportedServerErr;
}
if (options.loadBalanced) {
Eif (!response.serviceId) {
throw new MongoCompatibilityError(
'Driver attempted to initialize in load balancing mode, ' +
'but the server does not support this mode.'
);
}
}
// NOTE: This is metadata attached to the connection while porting away from
// handshake being done in the `Server` class. Likely, it should be
// relocated, or at very least restructured.
conn.hello = response;
conn.lastHelloMS = new Date().getTime() - start;
if (!response.arbiterOnly && credentials) {
// store the response on auth context
authContext.response = response;
const resolvedCredentials = credentials.resolveAuthMechanism(response);
const provider = options.authProviders.getOrCreateProvider(
resolvedCredentials.mechanism,
resolvedCredentials.mechanismProperties
);
Iif (!provider) {
throw new MongoInvalidArgumentError(
`No AuthProvider for ${resolvedCredentials.mechanism} defined.`
);
}
try {
await provider.auth(authContext);
} catch (error) {
Eif (error instanceof MongoError) {
error.addErrorLabel(MongoErrorLabel.HandshakeError);
if (needsRetryableWriteLabel(error, response.maxWireVersion, conn.description.type)) {
error.addErrorLabel(MongoErrorLabel.RetryableWriteError);
}
}
throw error;
}
}
// Connection establishment is socket creation (tcp handshake, tls handshake, MongoDB handshake (saslStart, saslContinue))
// Once connection is established, command logging can log events (if enabled)
conn.established = true;
async function executeHandshake(handshakeDoc: Document, handshakeOptions: CommandOptions) {
try {
const handshakeResponse = await conn.command(
ns('admin.$cmd'),
handshakeDoc,
handshakeOptions
);
return handshakeResponse;
} catch (error) {
if (error instanceof MongoError) {
error.addErrorLabel(MongoErrorLabel.HandshakeError);
}
throw error;
}
}
}
/**
* HandshakeDocument used during authentication.
* @internal
*/
export interface HandshakeDocument extends Document {
/**
* @deprecated Use hello instead
*/
ismaster?: boolean;
hello?: boolean;
helloOk?: boolean;
client: Document;
compression: string[];
saslSupportedMechs?: string;
loadBalanced?: boolean;
}
/**
* @internal
*
* This function is only exposed for testing purposes.
*/
export async function prepareHandshakeDocument(
authContext: AuthContext
): Promise<HandshakeDocument> {
const options = authContext.options;
const compressors = options.compressors ? options.compressors : [];
const { serverApi } = authContext.connection;
const clientMetadata: Document = await options.extendedMetadata;
const handshakeDoc: HandshakeDocument = {
[serverApi?.version || options.loadBalanced === true ? 'hello' : LEGACY_HELLO_COMMAND]: 1,
helloOk: true,
client: clientMetadata,
compression: compressors
};
if (options.loadBalanced === true) {
handshakeDoc.loadBalanced = true;
}
const credentials = authContext.credentials;
if (credentials) {
if (credentials.mechanism === AuthMechanism.MONGODB_DEFAULT && credentials.username) {
handshakeDoc.saslSupportedMechs = `${credentials.source}.${credentials.username}`;
const provider = authContext.options.authProviders.getOrCreateProvider(
AuthMechanism.MONGODB_SCRAM_SHA256,
credentials.mechanismProperties
);
Iif (!provider) {
// This auth mechanism is always present.
throw new MongoInvalidArgumentError(
`No AuthProvider for ${AuthMechanism.MONGODB_SCRAM_SHA256} defined.`
);
}
return await provider.prepare(handshakeDoc, authContext);
}
const provider = authContext.options.authProviders.getOrCreateProvider(
credentials.mechanism,
credentials.mechanismProperties
);
Iif (!provider) {
throw new MongoInvalidArgumentError(`No AuthProvider for ${credentials.mechanism} defined.`);
}
return await provider.prepare(handshakeDoc, authContext);
}
return handshakeDoc;
}
/** @public */
export const LEGAL_TLS_SOCKET_OPTIONS = [
'allowPartialTrustChain',
'ALPNProtocols',
'ca',
'cert',
'checkServerIdentity',
'ciphers',
'crl',
'ecdhCurve',
'key',
'minDHSize',
'passphrase',
'pfx',
'rejectUnauthorized',
'secureContext',
'secureProtocol',
'servername',
'session'
] as const;
/** @public */
export const LEGAL_TCP_SOCKET_OPTIONS = [
'autoSelectFamily',
'autoSelectFamilyAttemptTimeout',
'family',
'hints',
'localAddress',
'localPort',
'lookup'
] as const;
function parseConnectOptions(options: ConnectionOptions): SocketConnectOpts {
const hostAddress = options.hostAddress;
Iif (!hostAddress) throw new MongoInvalidArgumentError('Option "hostAddress" is required');
const result: Partial<net.TcpNetConnectOpts & net.IpcNetConnectOpts> = {};
for (const name of LEGAL_TCP_SOCKET_OPTIONS) {
if (options[name] != null) {
(result as Document)[name] = options[name];
}
}
if (typeof hostAddress.socketPath === 'string') {
result.path = hostAddress.socketPath;
return result as net.IpcNetConnectOpts;
} else Eif (typeof hostAddress.host === 'string') {
result.host = hostAddress.host;
result.port = hostAddress.port;
return result as net.TcpNetConnectOpts;
} else {
// This should never happen since we set up HostAddresses
// But if we don't throw here the socket could hang until timeout
// TODO(NODE-3483)
throw new MongoRuntimeError(`Unexpected HostAddress ${JSON.stringify(hostAddress)}`);
}
}
type MakeConnectionOptions = ConnectionOptions & { existingSocket?: Stream };
function parseSslOptions(options: MakeConnectionOptions): TLSConnectionOpts {
const result: TLSConnectionOpts = parseConnectOptions(options);
// Merge in valid SSL options
for (const name of LEGAL_TLS_SOCKET_OPTIONS) {
Iif (options[name] != null) {
(result as Document)[name] = options[name];
}
}
Iif (options.existingSocket) {
result.socket = options.existingSocket;
}
// Set default sni servername to be the same as host
Eif (result.servername == null && result.host && !net.isIP(result.host)) {
result.servername = result.host;
}
return result;
}
export async function makeSocket(options: MakeConnectionOptions): Promise<Stream> {
const useTLS = options.tls ?? false;
const noDelay = options.noDelay ?? true;
const connectTimeoutMS = options.connectTimeoutMS ?? 30000;
const existingSocket = options.existingSocket;
let socket: Stream;
Iif (options.proxyHost != null) {
// Currently, only Socks5 is supported.
return await makeSocks5Connection({
...options,
connectTimeoutMS // Should always be present for Socks5
});
}
if (useTLS) {
const tlsSocket = tls.connect(parseSslOptions(options));
Eif (typeof tlsSocket.disableRenegotiation === 'function') {
tlsSocket.disableRenegotiation();
}
socket = tlsSocket;
} else Iif (existingSocket) {
// In the TLS case, parseSslOptions() sets options.socket to existingSocket,
// so we only need to handle the non-TLS case here (where existingSocket
// gives us all we need out of the box).
socket = existingSocket;
} else {
socket = net.createConnection(parseConnectOptions(options));
}
socket.setKeepAlive(true, 300000);
socket.setTimeout(connectTimeoutMS);
socket.setNoDelay(noDelay);
let cancellationHandler: ((err: Error) => void) | null = null;
const { promise: connectedSocket, resolve, reject } = promiseWithResolvers<Stream>();
Iif (existingSocket) {
resolve(socket);
} else {
const start = performance.now();
const connectEvent = useTLS ? 'secureConnect' : 'connect';
socket
.once(connectEvent, () => resolve(socket))
.once('error', cause =>
reject(new MongoNetworkError(MongoError.buildErrorMessage(cause), { cause }))
)
.once('timeout', () => {
reject(
new MongoNetworkTimeoutError(
`Socket '${connectEvent}' timed out after ${(performance.now() - start) | 0}ms (connectTimeoutMS: ${connectTimeoutMS})`
)
);
})
.once('close', () =>
reject(
new MongoNetworkError(
`Socket closed after ${(performance.now() - start) | 0} during connection establishment`
)
)
);
if (options.cancellationToken != null) {
cancellationHandler = () =>
reject(
new MongoNetworkError(
`Socket connection establishment was cancelled after ${(performance.now() - start) | 0}`
)
);
options.cancellationToken.once('cancel', cancellationHandler);
}
}
try {
socket = await connectedSocket;
return socket;
} catch (error) {
socket.destroy();
throw error;
} finally {
socket.setTimeout(0);
if (cancellationHandler != null) {
options.cancellationToken?.removeListener('cancel', cancellationHandler);
}
}
}
let socks: SocksLib | null = null;
function loadSocks() {
if (socks == null) {
const socksImport = getSocks();
if ('kModuleError' in socksImport) {
throw socksImport.kModuleError;
}
socks = socksImport;
}
return socks;
}
async function makeSocks5Connection(options: MakeConnectionOptions): Promise<Stream> {
const hostAddress = HostAddress.fromHostPort(
options.proxyHost ?? '', // proxyHost is guaranteed to set here
options.proxyPort ?? 1080
);
// First, connect to the proxy server itself:
const rawSocket = await makeSocket({
...options,
hostAddress,
tls: false,
proxyHost: undefined
});
const destination = parseConnectOptions(options) as net.TcpNetConnectOpts;
if (typeof destination.host !== 'string' || typeof destination.port !== 'number') {
throw new MongoInvalidArgumentError('Can only make Socks5 connections to TCP hosts');
}
socks ??= loadSocks();
let existingSocket: Stream;
try {
// Then, establish the Socks5 proxy connection:
const connection = await socks.SocksClient.createConnection({
existing_socket: rawSocket,
timeout: options.connectTimeoutMS,
command: 'connect',
destination: {
host: destination.host,
port: destination.port
},
proxy: {
// host and port are ignored because we pass existing_socket
host: 'iLoveJavaScript',
port: 0,
type: 5,
userId: options.proxyUsername || undefined,
password: options.proxyPassword || undefined
}
});
existingSocket = connection.socket;
} catch (cause) {
throw new MongoNetworkError(MongoError.buildErrorMessage(cause), { cause });
}
// Finally, now treat the resulting duplex stream as the
// socket over which we send and receive wire protocol messages:
return await makeSocket({ ...options, existingSocket, proxyHost: undefined });
}
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