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import { type MongoCryptContext, type MongoCryptKMSRequest } from 'mongodb-client-encryption';
import * as net from 'net';
import * as tls from 'tls';
import {
type BSONSerializeOptions,
deserialize,
type Document,
pluckBSONSerializeOptions,
serialize
} from '../bson';
import { type ProxyOptions } from '../cmap/connection';
import { CursorTimeoutContext } from '../cursor/abstract_cursor';
import { getSocks, type SocksLib } from '../deps';
import { MongoOperationTimeoutError } from '../error';
import { type MongoClient, type MongoClientOptions } from '../mongo_client';
import { type Abortable } from '../mongo_types';
import { type CollectionInfo } from '../operations/list_collections';
import { Timeout, type TimeoutContext, TimeoutError } from '../timeout';
import {
addAbortListener,
BufferPool,
kDispose,
MongoDBCollectionNamespace,
promiseWithResolvers
} from '../utils';
import { autoSelectSocketOptions, type DataKey } from './client_encryption';
import { MongoCryptError } from './errors';
import { type MongocryptdManager } from './mongocryptd_manager';
import { type KMSProviders } from './providers';
let socks: SocksLib | null = null;
function loadSocks(): SocksLib {
Eif (socks == null) {
const socksImport = getSocks();
Iif ('kModuleError' in socksImport) {
throw socksImport.kModuleError;
}
socks = socksImport;
}
return socks;
}
// libmongocrypt states
const MONGOCRYPT_CTX_ERROR = 0;
const MONGOCRYPT_CTX_NEED_MONGO_COLLINFO = 1;
const MONGOCRYPT_CTX_NEED_MONGO_MARKINGS = 2;
const MONGOCRYPT_CTX_NEED_MONGO_KEYS = 3;
const MONGOCRYPT_CTX_NEED_KMS_CREDENTIALS = 7;
const MONGOCRYPT_CTX_NEED_KMS = 4;
const MONGOCRYPT_CTX_READY = 5;
const MONGOCRYPT_CTX_DONE = 6;
const HTTPS_PORT = 443;
const stateToString = new Map([
[MONGOCRYPT_CTX_ERROR, 'MONGOCRYPT_CTX_ERROR'],
[MONGOCRYPT_CTX_NEED_MONGO_COLLINFO, 'MONGOCRYPT_CTX_NEED_MONGO_COLLINFO'],
[MONGOCRYPT_CTX_NEED_MONGO_MARKINGS, 'MONGOCRYPT_CTX_NEED_MONGO_MARKINGS'],
[MONGOCRYPT_CTX_NEED_MONGO_KEYS, 'MONGOCRYPT_CTX_NEED_MONGO_KEYS'],
[MONGOCRYPT_CTX_NEED_KMS_CREDENTIALS, 'MONGOCRYPT_CTX_NEED_KMS_CREDENTIALS'],
[MONGOCRYPT_CTX_NEED_KMS, 'MONGOCRYPT_CTX_NEED_KMS'],
[MONGOCRYPT_CTX_READY, 'MONGOCRYPT_CTX_READY'],
[MONGOCRYPT_CTX_DONE, 'MONGOCRYPT_CTX_DONE']
]);
const INSECURE_TLS_OPTIONS = [
'tlsInsecure',
'tlsAllowInvalidCertificates',
'tlsAllowInvalidHostnames',
// These options are disallowed by the spec, so we explicitly filter them out if provided, even
// though the StateMachine does not declare support for these options.
'tlsDisableOCSPEndpointCheck',
'tlsDisableCertificateRevocationCheck'
];
/**
* Helper function for logging. Enabled by setting the environment flag MONGODB_CRYPT_DEBUG.
* @param msg - Anything you want to be logged.
*/
function debug(msg: unknown) {
Iif (process.env.MONGODB_CRYPT_DEBUG) {
// eslint-disable-next-line no-console
console.error(msg);
}
}
declare module 'mongodb-client-encryption' {
// the properties added to `MongoCryptContext` here are only used for the `StateMachine`'s
// execute method and are not part of the C++ bindings.
interface MongoCryptContext {
id: number;
document: Document;
ns: string;
}
}
/**
* @public
*
* TLS options to use when connecting. The spec specifically calls out which insecure
* tls options are not allowed:
*
* - tlsAllowInvalidCertificates
* - tlsAllowInvalidHostnames
* - tlsInsecure
*
* These options are not included in the type, and are ignored if provided.
*/
export type ClientEncryptionTlsOptions = Pick<
MongoClientOptions,
'tlsCAFile' | 'tlsCertificateKeyFile' | 'tlsCertificateKeyFilePassword'
>;
/** @public */
export type CSFLEKMSTlsOptions = {
aws?: ClientEncryptionTlsOptions;
gcp?: ClientEncryptionTlsOptions;
kmip?: ClientEncryptionTlsOptions;
local?: ClientEncryptionTlsOptions;
azure?: ClientEncryptionTlsOptions;
[key: string]: ClientEncryptionTlsOptions | undefined;
};
/**
* @public
*
* Socket options to use for KMS requests.
*/
export type ClientEncryptionSocketOptions = Pick<
MongoClientOptions,
'autoSelectFamily' | 'autoSelectFamilyAttemptTimeout'
>;
/**
* This is kind of a hack. For `rewrapManyDataKey`, we have tests that
* guarantee that when there are no matching keys, `rewrapManyDataKey` returns
* nothing. We also have tests for auto encryption that guarantee for `encrypt`
* we return an error when there are no matching keys. This error is generated in
* subsequent iterations of the state machine.
* Some apis (`encrypt`) throw if there are no filter matches and others (`rewrapManyDataKey`)
* do not. We set the result manually here, and let the state machine continue. `libmongocrypt`
* will inform us if we need to error by setting the state to `MONGOCRYPT_CTX_ERROR` but
* otherwise we'll return `{ v: [] }`.
*/
let EMPTY_V;
/**
* @internal
*
* An interface representing an object that can be passed to the `StateMachine.execute` method.
*
* Not all properties are required for all operations.
*/
export interface StateMachineExecutable {
_keyVaultNamespace: string;
_keyVaultClient: MongoClient;
askForKMSCredentials: () => Promise<KMSProviders>;
/** only used for auto encryption */
_metaDataClient?: MongoClient;
/** only used for auto encryption */
_mongocryptdClient?: MongoClient;
/** only used for auto encryption */
_mongocryptdManager?: MongocryptdManager;
}
export type StateMachineOptions = {
/** socks5 proxy options, if set. */
proxyOptions: ProxyOptions;
/** TLS options for KMS requests, if set. */
tlsOptions: CSFLEKMSTlsOptions;
/** Socket specific options we support. */
socketOptions: ClientEncryptionSocketOptions;
} & Pick<BSONSerializeOptions, 'promoteLongs' | 'promoteValues'>;
/**
* @internal
* An internal class that executes across a MongoCryptContext until either
* a finishing state or an error is reached. Do not instantiate directly.
*/
// TODO(DRIVERS-2671): clarify CSOT behavior for FLE APIs
export class StateMachine {
constructor(
private options: StateMachineOptions,
private bsonOptions = pluckBSONSerializeOptions(options)
) {}
/**
* Executes the state machine according to the specification
*/
async execute(
executor: StateMachineExecutable,
context: MongoCryptContext,
options: { timeoutContext?: TimeoutContext } & Abortable
): Promise<Uint8Array> {
const keyVaultNamespace = executor._keyVaultNamespace;
const keyVaultClient = executor._keyVaultClient;
const metaDataClient = executor._metaDataClient;
const mongocryptdClient = executor._mongocryptdClient;
const mongocryptdManager = executor._mongocryptdManager;
let result: Uint8Array | null = null;
// Typescript treats getters just like properties: Once you've tested it for equality
// it cannot change. Which is exactly the opposite of what we use state and status for.
// Every call to at least `addMongoOperationResponse` and `finalize` can change the state.
// These wrappers let us write code more naturally and not add compiler exceptions
// to conditions checks inside the state machine.
const getStatus = () => context.status;
const getState = () => context.state;
while (getState() !== MONGOCRYPT_CTX_DONE && getState() !== MONGOCRYPT_CTX_ERROR) {
options.signal?.throwIfAborted();
debug(`[context#${context.id}] ${stateToString.get(getState()) || getState()}`);
switch (getState()) {
case MONGOCRYPT_CTX_NEED_MONGO_COLLINFO: {
const filter = deserialize(context.nextMongoOperation());
Iif (!metaDataClient) {
throw new MongoCryptError(
'unreachable state machine state: entered MONGOCRYPT_CTX_NEED_MONGO_COLLINFO but metadata client is undefined'
);
}
const collInfoCursor = this.fetchCollectionInfo(
metaDataClient,
context.ns,
filter,
options
);
for await (const collInfo of collInfoCursor) {
context.addMongoOperationResponse(serialize(collInfo));
if (getState() === MONGOCRYPT_CTX_ERROR) break;
}
if (getState() === MONGOCRYPT_CTX_ERROR) break;
context.finishMongoOperation();
break;
}
case MONGOCRYPT_CTX_NEED_MONGO_MARKINGS: {
const command = context.nextMongoOperation();
if (getState() === MONGOCRYPT_CTX_ERROR) break;
Iif (!mongocryptdClient) {
throw new MongoCryptError(
'unreachable state machine state: entered MONGOCRYPT_CTX_NEED_MONGO_MARKINGS but mongocryptdClient is undefined'
);
}
// When we are using the shared library, we don't have a mongocryptd manager.
const markedCommand: Uint8Array = mongocryptdManager
? await mongocryptdManager.withRespawn(
this.markCommand.bind(this, mongocryptdClient, context.ns, command, options)
)
: await this.markCommand(mongocryptdClient, context.ns, command, options);
context.addMongoOperationResponse(markedCommand);
context.finishMongoOperation();
break;
}
case MONGOCRYPT_CTX_NEED_MONGO_KEYS: {
const filter = context.nextMongoOperation();
const keys = await this.fetchKeys(keyVaultClient, keyVaultNamespace, filter, options);
if (keys.length === 0) {
// See docs on EMPTY_V
result = EMPTY_V ??= serialize({ v: [] });
}
for await (const key of keys) {
context.addMongoOperationResponse(serialize(key));
}
context.finishMongoOperation();
break;
}
case MONGOCRYPT_CTX_NEED_KMS_CREDENTIALS: {
const kmsProviders = await executor.askForKMSCredentials();
context.provideKMSProviders(serialize(kmsProviders));
break;
}
case MONGOCRYPT_CTX_NEED_KMS: {
await Promise.all(this.requests(context, options));
context.finishKMSRequests();
break;
}
case MONGOCRYPT_CTX_READY: {
const finalizedContext = context.finalize();
if (getState() === MONGOCRYPT_CTX_ERROR) {
const message = getStatus().message || 'Finalization error';
throw new MongoCryptError(message);
}
result = finalizedContext;
break;
}
default:
throw new MongoCryptError(`Unknown state: ${getState()}`);
}
}
if (getState() === MONGOCRYPT_CTX_ERROR || result == null) {
const message = getStatus().message;
Iif (!message) {
debug(
`unidentifiable error in MongoCrypt - received an error status from \`libmongocrypt\` but received no error message.`
);
}
throw new MongoCryptError(
message ??
'unidentifiable error in MongoCrypt - received an error status from `libmongocrypt` but received no error message.'
);
}
return result;
}
/**
* Handles the request to the KMS service. Exposed for testing purposes. Do not directly invoke.
* @param kmsContext - A C++ KMS context returned from the bindings
* @returns A promise that resolves when the KMS reply has be fully parsed
*/
async kmsRequest(
request: MongoCryptKMSRequest,
options?: { timeoutContext?: TimeoutContext } & Abortable
): Promise<void> {
const parsedUrl = request.endpoint.split(':');
const port = parsedUrl[1] != null ? Number.parseInt(parsedUrl[1], 10) : HTTPS_PORT;
const socketOptions: tls.ConnectionOptions & {
host: string;
port: number;
autoSelectFamily?: boolean;
autoSelectFamilyAttemptTimeout?: number;
} = {
host: parsedUrl[0],
servername: parsedUrl[0],
port,
...autoSelectSocketOptions(this.options.socketOptions || {})
};
const message = request.message;
const buffer = new BufferPool();
let netSocket: net.Socket;
let socket: tls.TLSSocket;
function destroySockets() {
for (const sock of [socket, netSocket]) {
if (sock) {
sock.destroy();
}
}
}
function onerror(cause: Error) {
return new MongoCryptError('KMS request failed', { cause });
}
function onclose() {
return new MongoCryptError('KMS request closed');
}
const tlsOptions = this.options.tlsOptions;
if (tlsOptions) {
const kmsProvider = request.kmsProvider;
const providerTlsOptions = tlsOptions[kmsProvider];
if (providerTlsOptions) {
const error = this.validateTlsOptions(kmsProvider, providerTlsOptions);
if (error) {
throw error;
}
try {
await this.setTlsOptions(providerTlsOptions, socketOptions);
} catch (err) {
throw onerror(err);
}
}
}
let abortListener;
try {
if (this.options.proxyOptions && this.options.proxyOptions.proxyHost) {
netSocket = new net.Socket();
const {
promise: willConnect,
reject: rejectOnNetSocketError,
resolve: resolveOnNetSocketConnect
} = promiseWithResolvers<void>();
netSocket
.once('error', err => rejectOnNetSocketError(onerror(err)))
.once('close', () => rejectOnNetSocketError(onclose()))
.once('connect', () => resolveOnNetSocketConnect());
const netSocketOptions = {
...socketOptions,
host: this.options.proxyOptions.proxyHost,
port: this.options.proxyOptions.proxyPort || 1080
};
netSocket.connect(netSocketOptions);
await willConnect;
try {
socks ??= loadSocks();
socketOptions.socket = (
await socks.SocksClient.createConnection({
existing_socket: netSocket,
command: 'connect',
destination: { host: socketOptions.host, port: socketOptions.port },
proxy: {
// host and port are ignored because we pass existing_socket
host: 'iLoveJavaScript',
port: 0,
type: 5,
userId: this.options.proxyOptions.proxyUsername,
password: this.options.proxyOptions.proxyPassword
}
})
).socket;
} catch (err) {
throw onerror(err);
}
}
socket = tls.connect(socketOptions, () => {
socket.write(message);
});
const {
promise: willResolveKmsRequest,
reject: rejectOnTlsSocketError,
resolve
} = promiseWithResolvers<void>();
abortListener = addAbortListener(options?.signal, function () {
destroySockets();
rejectOnTlsSocketError(this.reason);
});
socket
.once('error', err => rejectOnTlsSocketError(onerror(err)))
.once('close', () => rejectOnTlsSocketError(onclose()))
.on('data', data => {
buffer.append(data);
while (request.bytesNeeded > 0 && buffer.length) {
const bytesNeeded = Math.min(request.bytesNeeded, buffer.length);
request.addResponse(buffer.read(bytesNeeded));
}
if (request.bytesNeeded <= 0) {
resolve();
}
});
await (options?.timeoutContext?.csotEnabled()
? Promise.all([
willResolveKmsRequest,
Timeout.expires(options.timeoutContext?.remainingTimeMS)
])
: willResolveKmsRequest);
} catch (error) {
if (error instanceof TimeoutError)
throw new MongoOperationTimeoutError('KMS request timed out');
throw error;
} finally {
// There's no need for any more activity on this socket at this point.
destroySockets();
abortListener?.[kDispose]();
}
}
*requests(context: MongoCryptContext, options?: { timeoutContext?: TimeoutContext } & Abortable) {
for (
let request = context.nextKMSRequest();
request != null;
request = context.nextKMSRequest()
) {
yield this.kmsRequest(request, options);
}
}
/**
* Validates the provided TLS options are secure.
*
* @param kmsProvider - The KMS provider name.
* @param tlsOptions - The client TLS options for the provider.
*
* @returns An error if any option is invalid.
*/
validateTlsOptions(
kmsProvider: string,
tlsOptions: ClientEncryptionTlsOptions
): MongoCryptError | void {
const tlsOptionNames = Object.keys(tlsOptions);
for (const option of INSECURE_TLS_OPTIONS) {
if (tlsOptionNames.includes(option)) {
return new MongoCryptError(`Insecure TLS options prohibited for ${kmsProvider}: ${option}`);
}
}
}
/**
* Sets only the valid secure TLS options.
*
* @param tlsOptions - The client TLS options for the provider.
* @param options - The existing connection options.
*/
async setTlsOptions(
tlsOptions: ClientEncryptionTlsOptions,
options: tls.ConnectionOptions
): Promise<void> {
if (tlsOptions.tlsCertificateKeyFile) {
const cert = await fs.readFile(tlsOptions.tlsCertificateKeyFile);
options.cert = options.key = cert;
}
if (tlsOptions.tlsCAFile) {
options.ca = await fs.readFile(tlsOptions.tlsCAFile);
}
if (tlsOptions.tlsCertificateKeyFilePassword) {
options.passphrase = tlsOptions.tlsCertificateKeyFilePassword;
}
}
/**
* Fetches collection info for a provided namespace, when libmongocrypt
* enters the `MONGOCRYPT_CTX_NEED_MONGO_COLLINFO` state. The result is
* used to inform libmongocrypt of the schema associated with this
* namespace. Exposed for testing purposes. Do not directly invoke.
*
* @param client - A MongoClient connected to the topology
* @param ns - The namespace to list collections from
* @param filter - A filter for the listCollections command
* @param callback - Invoked with the info of the requested collection, or with an error
*/
fetchCollectionInfo(
client: MongoClient,
ns: string,
filter: Document,
options?: { timeoutContext?: TimeoutContext } & Abortable
): AsyncIterable<CollectionInfo> {
const { db } = MongoDBCollectionNamespace.fromString(ns);
const cursor = client.db(db).listCollections(filter, {
promoteLongs: false,
promoteValues: false,
timeoutContext:
options?.timeoutContext && new CursorTimeoutContext(options?.timeoutContext, Symbol()),
signal: options?.signal,
nameOnly: false
});
return cursor;
}
/**
* Calls to the mongocryptd to provide markings for a command.
* Exposed for testing purposes. Do not directly invoke.
* @param client - A MongoClient connected to a mongocryptd
* @param ns - The namespace (database.collection) the command is being executed on
* @param command - The command to execute.
* @param callback - Invoked with the serialized and marked bson command, or with an error
*/
async markCommand(
client: MongoClient,
ns: string,
command: Uint8Array,
options?: { timeoutContext?: TimeoutContext } & Abortable
): Promise<Uint8Array> {
const { db } = MongoDBCollectionNamespace.fromString(ns);
const bsonOptions = { promoteLongs: false, promoteValues: false };
const rawCommand = deserialize(command, bsonOptions);
const commandOptions: {
timeoutMS?: number;
signal?: AbortSignal;
} = {
timeoutMS: undefined,
signal: undefined
};
if (options?.timeoutContext?.csotEnabled()) {
commandOptions.timeoutMS = options.timeoutContext.remainingTimeMS;
}
Iif (options?.signal) {
commandOptions.signal = options.signal;
}
const response = await client.db(db).command(rawCommand, {
...bsonOptions,
...commandOptions
});
return serialize(response, this.bsonOptions);
}
/**
* Requests keys from the keyVault collection on the topology.
* Exposed for testing purposes. Do not directly invoke.
* @param client - A MongoClient connected to the topology
* @param keyVaultNamespace - The namespace (database.collection) of the keyVault Collection
* @param filter - The filter for the find query against the keyVault Collection
* @param callback - Invoked with the found keys, or with an error
*/
fetchKeys(
client: MongoClient,
keyVaultNamespace: string,
filter: Uint8Array,
options?: { timeoutContext?: TimeoutContext } & Abortable
): Promise<Array<DataKey>> {
const { db: dbName, collection: collectionName } =
MongoDBCollectionNamespace.fromString(keyVaultNamespace);
const commandOptions: {
timeoutContext?: CursorTimeoutContext;
signal?: AbortSignal;
} = {
timeoutContext: undefined,
signal: undefined
};
if (options?.timeoutContext != null) {
commandOptions.timeoutContext = new CursorTimeoutContext(options.timeoutContext, Symbol());
}
Iif (options?.signal != null) {
commandOptions.signal = options.signal;
}
return client
.db(dbName)
.collection<DataKey>(collectionName, { readConcern: { level: 'majority' } })
.find(deserialize(filter), commandOptions)
.toArray();
}
}
|