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import {jsonc} from 'jsonc';
import {MFAMethod} from '../../lib/icloud/mfa/mfa-method.js';
import {iCPSEventCloud, iCPSEventMFA, iCPSEventRuntimeWarning, iCPSEventWebServer} from '../../lib/resources/events-types.js';
import {Resources} from '../../lib/resources/main.js';
import {WEB_SERVER_ERR} from '../error/error-codes.js';
import {iCPSError} from '../error/error.js';
import {TokenApp} from '../icloud-app.js';
import {faviconBase64, iconBase64} from './assets/icons.js';
import {manifest} from './assets/manifest.js';
import {serviceWorker} from './scripts/service-worker.js';
import {RequestMfaView} from './view/request-mfa-view.js';
import {StateView} from './view/state-view.js';
import {SubmitMfaView} from './view/submit-mfa-view.js';
import {PrometheusMetricsExporter} from '../event/prometheus-metrics-exporter.js';
import {LogLevel, StateType} from '../../lib/resources/state-manager.js';
import {NotificationPusher} from './notification-pusher.js';
import {URL} from 'url';
import {once} from 'events';
type WebServerResponse = {
code: number,
header: {
"Content-Type": string,
"Content-Length"?: number,
Location?: string
},
body: any
}
type WebServerRoute = (url: URL, body?: string, headers?: http.IncomingHttpHeaders) => WebServerResponse
type WebServerSitemap = {
POST: {
[path: string]: WebServerRoute
},
GET: {
[path: string]: WebServerRoute
}
}
/**
* This objects starts a server, that will listen to incoming MFA codes and other MFA related commands
*/
export class WebServer {
/**
* The server object
*/
server: http.Server;
/**
* Holds the MFA method used for this server
*/
mfaMethod: MFAMethod;
/**
* Provides notification capabilities to the server
*/
notificationPusher: NotificationPusher = new NotificationPusher();
/**
* Provides the metrics for the /metrics endpoint - only set, if the prometheus metrics export is enabled
*/
prometheusMetricsExporter?: PrometheusMetricsExporter;
/**
* Routing table for this server
*/
_sitemap: WebServerSitemap = {
GET: {
'/': this.handleRoot.bind(this),
'/state': this.handleStateView.bind(this),
'/submit-mfa': this.handleSubmitMFAView.bind(this),
'/request-mfa': this.handleRequestMFAView.bind(this),
'/service-worker.js': this.handleServiceWorker.bind(this),
'/manifest.json': this.handleManifest.bind(this),
'/icon.png': this.handleIcon.bind(this),
'/favicon.ico': this.handleFavicon.bind(this),
'/api/state': this.handleStateRequest.bind(this),
'/api/log': this.handleLogRequest.bind(this),
'/api/vapid-public-key': this.handleVapidPublicKeyRequest.bind(this)
},
POST: {
'/api/reauthenticate': this.handleReauthRequest.bind(this),
'/api/mfa': this.handleMFACode.bind(this),
'/api/resend_mfa': this.handleMFAResend.bind(this),
'/api/sync': this.handleSyncRequest.bind(this),
'/api/subscribe': this.handlePushSubscription.bind(this)
}
}
/**
* Creates the server object and starts the web server
* @returns
*/
static async spawn(prometheusMetricsExporter?: PrometheusMetricsExporter): Promise<WebServer> {
return new WebServer(prometheusMetricsExporter).startServer();
}
/**
* Creates the server object
* @param prometheusMetricsExporter - The exporter serving the /metrics endpoint - the endpoint is only exposed, if the exporter is provided and the prometheus metrics export is enabled
* @emits iCPSEventWebServer.ERROR - When an error associated to the server occurs - Provides iCPSError as argument
*/
constructor(prometheusMetricsExporter?: PrometheusMetricsExporter) {
Resources.logger(this).debug(`Preparing web server on port ${Resources.manager().webServerPort}`);
this.server = http.createServer(this.handleRequest.bind(this));
// allow the process to exit, if this server is the only thing left running
this.server.unref();
this.mfaMethod = new MFAMethod();
if (prometheusMetricsExporter && Resources.manager().exportPrometheusMetrics) {
this.prometheusMetricsExporter = prometheusMetricsExporter;
this._sitemap.GET[`/metrics`] = this.handleMetricsRequest.bind(this);
}
// Every new MFA flow starts with the code pushed to the trusted devices
Resources.events(this).on(iCPSEventCloud.MFA_REQUIRED, () => {
this.mfaMethod = new MFAMethod();
});
}
/* c8 ignore start */
// Never starting/stopping the server just to see logger messages
/**
* Closes this server
*/
close(): Promise<void> {
Resources.events(this).removeListeners();
return new Promise<void>(resolve => {
this.server.close(() => resolve());
});
}
/**
* Starts the server and listens for incoming requests to perform MFA actions
*/
startServer(): Promise<WebServer> {
return new Promise<WebServer>((resolve, reject) => {
try {
this.server.listen(Resources.manager().webServerPort, () => {
// Updating the port to match the actual listening port
//Resources.manager().webServerPort = (this.server.address() as AddressInfo).port
Resources.emit(iCPSEventWebServer.STARTED, Resources.manager().webServerPort);
Resources.logger(this).info(`Exposing GET endpoints: ${jsonc.stringify(Object.keys(this._sitemap.GET))}`);
Resources.logger(this).info(`Exposing POST endpoints: ${jsonc.stringify(Object.keys(this._sitemap.POST))}`);
resolve(this);
});
} catch (err) {
reject(new iCPSError(WEB_SERVER_ERR.STARTUP_FAILED).addCause(err));
}
});
}
/* c8 ignore stop */
/**
* Handles incoming http requests
* @param req - The HTTP request object
* @param res - The HTTP response object
* @emits iCPSEventRuntimeWarning.WEB_SERVER_ERR - When the request method or endpoint of server could not be found - Provides iCPSError as argument
*/
async handleRequest(req: http.IncomingMessage, res: http.ServerResponse) {
try {
const url = new URL(
(req.url ?? `/`).replace(new RegExp(`^${RegExp.escape(Resources.manager().webBasePath)}`), ``), // Removing the web base path for request matching (escaping, since it is user provided)
`http://localhost/` // Necessary, because the req.url is relative
)
const body = await this.readBody(req)
const headers = req.headers
if (req.method === `GET` && url.pathname in this._sitemap.GET) {
this.sendResponse(this._sitemap.GET[url.pathname](url, body, headers), res)
return;
}
if (req.method === `POST` && url.pathname in this._sitemap.POST) {
this.sendResponse(this._sitemap.POST[url.pathname](url, body, headers), res)
return;
}
Resources.logger(this).warn(`Unknown request method: ${req.method} for ${req.url}`);
Resources.emit(iCPSEventRuntimeWarning.WEB_SERVER_ERROR, new iCPSError(WEB_SERVER_ERR.BAD_REQUEST)
.addMessage(`Unknown path: endpoint ${req.url}, method ${req.method}, pathname ${url.pathname}`)
.addContext(`request`, req));
this.sendResponse({
code: 400,
header: {
"Content-Type": `application/json`
},
body: {
message: `Method (${req.method}) not supported on endpoint ${req.url}`
}
}, res)
} catch (err) {
const error = new iCPSError(WEB_SERVER_ERR.UNKNOWN_ERR)
.addCause(err)
.addContext(`request`, req)
.addContext(`responseWritten`, !res.writable)
Resources.emit(iCPSEventRuntimeWarning.WEB_SERVER_ERROR, error);
if (res.writable) {
this.sendResponse({
code: 500,
header: {
"Content-Type": `application/json`
},
body: {
message: error.getDescription()
}
}, res)
}
}
}
async readBody(req: http.IncomingMessage): Promise<string> {
try {
if(req.headers[`content-length`] && Number.parseInt(req.headers[`content-length`], 10) > 0) {
let body = ``;
req.on(`data`, chunk => {
body += chunk.toString();
});
await once(req, `end`) // Rejects if an 'error' event is emitted
Resources.logger(this).debug(`Read body: ${body}`)
return body;
}
return ``;
} catch (err) {
throw new iCPSError(WEB_SERVER_ERR.UNABLE_TO_READ_BODY)
.addCause(err)
.addContext(`request`, req)
}
}
sendResponse(response: WebServerResponse, res: http.ServerResponse) {
res.writeHead(response.code, response.header)
.end(
typeof response.body === `string` || response.body instanceof Buffer
? response.body
: jsonc.stringify(response.body)
)
}
handleRoot(): WebServerResponse {
return {
code: 302,
header: {
"Content-Type": `text/plain`,
Location: `${Resources.manager().webBasePath}/state`
},
body: ``
}
}
handleServiceWorker(): WebServerResponse {
return {
code: 200,
header: {
"Content-Type": `application/javascript`
},
body: serviceWorker(Resources.manager().webBasePath)
}
}
handleManifest(): WebServerResponse {
return {
code: 200,
header: {
'Content-Type': `application/json`
},
body: manifest(Resources.manager().webBasePath)
}
}
handleIcon(): WebServerResponse {
const iconBuffer = Buffer.from(iconBase64, `base64`);
return {
code: 200,
header: {
'Content-Type': `image/png`,
'Content-Length': iconBuffer.length,
},
body: iconBuffer
}
}
handleFavicon(): WebServerResponse {
const faviconBuffer = Buffer.from(faviconBase64, `base64`);
return {
code: 200,
header: {
'Content-Type': `image/x-icon`,
'Content-Length': faviconBuffer.length,
},
body: faviconBuffer
}
}
/**
* This function will handle the request send to the state endpoint
*/
handleStateRequest(): WebServerResponse {
return {
code: 200,
header: {
"Content-Type": `application/json`
},
body: Resources.state().serialize()
}
}
handleLogRequest(url: URL): WebServerResponse {
const logLevelMatch = url.search.match(/loglevel=(debug|info|warn|error)/);
const logLevel = logLevelMatch?.[1] as LogLevel ?? `none`
return {
code: 200,
header: {
"Content-Type": `application/json`
},
body: Resources.state().serializeLog({level: logLevel})
}
}
handleVapidPublicKeyRequest(): WebServerResponse {
return {
code: 200,
header: {
"Content-Type": `application/json`
},
body: {
publicKey: Resources.manager().notificationVapidCredentials.publicKey
}
}
}
/**
* This function will handle the request send to the metrics endpoint, negotiating the exposition format based on the Accept header
* @param _url - The parsed URL invoking this request
* @param _body - The request body
* @param headers - The request headers
*/
handleMetricsRequest(_url: URL, _body?: string, headers?: http.IncomingHttpHeaders): WebServerResponse {
const exporter = this.prometheusMetricsExporter!;
const {contentType, body} = exporter.render(exporter.negotiate(headers?.accept));
return {
code: 200,
header: {
"Content-Type": contentType
},
body
}
}
/**
* This function will check if the server is currently expecting an MFA code
* @returns - Undefined if the server is expecting an MFA code, otherwise a WebServerResponse object indicating the error
*/
handleInProgress(): WebServerResponse | undefined {
if (Resources.state().state !== StateType.READY) {
Resources.emit(iCPSEventRuntimeWarning.WEB_SERVER_ERROR, new iCPSError(WEB_SERVER_ERR.SYNC_IN_PROGRESS));
return {
code: 412,
header: {
"Content-Type": `application/json`
},
body: {
message: `Cannot perform action while sync is in progress`,
}
}
}
return undefined;
}
/**
* This function will handle the request send to the re-authentication endpoint
* @emits iCPSEventWebServer.REAUTH_REQUESTED - When the request was received
* @emits iCPSEventWebServer.REAUTH_ERROR - When there was an error
*/
handleReauthRequest(): WebServerResponse {
const check = this.handleInProgress();
if (check) {
return check;
}
Resources.emit(iCPSEventWebServer.REAUTH_REQUESTED);
this.triggerReauth()
.catch(err => {
Resources.emit(iCPSEventWebServer.REAUTH_ERROR, iCPSError.toiCPSError(err));
});
return {
code: 200,
header: {
"Content-Type": `application/json`
},
body: {
message: `Reauthentication requested`
}
}
}
/**
* This function will trigger the reauthentication process
* @param app - An optional TokenApp instance to use for reauthentication. If not provided, a new instance will be created (structured for testing purposes)
* @returns A promise that resolves when the reauthentication process is complete
*/
triggerReauth(app: TokenApp = new TokenApp()): Promise<unknown> {
return app.run()
}
/**
* This function will handle the request send to the sync endpoint
* @param res - The HTTP response object
* @emits iCPSEventWebServer.SYNC_REQUESTED - When the sync was requested
*/
handleSyncRequest(): WebServerResponse {
const check = this.handleInProgress();
if (check) {
return check;
}
Resources.emit(iCPSEventWebServer.SYNC_REQUESTED); // Will run a manual trigger for the cron-job
return {
code: 200,
header: {
"Content-Type": `application/json`
},
body: {
message: `Sync requested`
}
}
}
/**
* This function will check if the server is currently expecting an MFA code
* @returns - Undefined if the server is expecting an MFA code, otherwise a WebServerResponse object indicating the error
*/
handleMFACheck(): WebServerResponse | undefined {
if (Resources.state().state !== StateType.BLOCKED) {
Resources.emit(iCPSEventRuntimeWarning.WEB_SERVER_ERROR, new iCPSError(WEB_SERVER_ERR.NO_CODE_EXPECTED));
return {
code: 412,
header: {
"Content-Type": `application/json`
},
body: {
message: `MFA code not expected at this time.`,
}
}
}
return undefined;
}
/**
* This function will handle requests send to the MFA code input endpoint
* @param url - The parsed URL invoking this request
* @emits iCPSEventRuntimeWarning.WEB_SERVER_ERR - When the parameters do not match the expected format
* @emits iCPSEventMFA.MFA_RECEIVED - When the MFA code was received - Provides MFA method and MFA code as arguments
*/
handleMFACode(url: URL): WebServerResponse {
const check = this.handleMFACheck();
if (check) {
return check;
}
const codeMatch = url.search.match(/code=(\d{6})/);
if (!codeMatch) {
Resources.emit(iCPSEventRuntimeWarning.WEB_SERVER_ERROR, new iCPSError(WEB_SERVER_ERR.CODE_FORMAT)
.addMessage(url.toString()));
return {
code: 400,
header: {
"Content-Type": `application/json`
},
body: {
message: `Unexpected MFA code format! Expecting 6 digits`
}
}
}
const mfa: string = codeMatch[1]
Resources.logger(this).debug(`Received MFA: ${mfa}`);
Resources.emit(iCPSEventMFA.MFA_RECEIVED, this.mfaMethod, mfa);
return {
code: 200,
header: {
"Content-Type": `application/json`
},
body: {
message: `Read MFA code: ${mfa}`
}
}
}
/**
* This function will handle the request send to the MFA code resend endpoint
* @param url - The parsed URL invoking this request
* @emits iCPSEventRuntimeWarning.WEB_SERVER_ERR - When the MFA resend method is not as expected - Provides iCPSError as argument
* @emits iCPSEventMFA.MFA_RESEND - When the MFA code resend was requested - Provides MFA method as argument
*/
handleMFAResend(url: URL): WebServerResponse {
const check = this.handleMFACheck();
if (check) {
return check;
}
const methodMatch = url.search.match(/method=(sms|voice|device)/);
if (!methodMatch) {
Resources.emit(iCPSEventRuntimeWarning.WEB_SERVER_ERROR, new iCPSError(WEB_SERVER_ERR.RESEND_METHOD_FORMAT)
.addContext(`requestURL`, url));
return {
code: 400,
header: {
"Content-Type": `application/json`
},
body: {
message: `Resend method does not match expected format`
}
}
}
const methodString = methodMatch[1];
const phoneNumberIdMatch = url.search.match(/phoneNumberId=(\d+)/);
if (phoneNumberIdMatch && methodString !== `device`) {
const phoneNumberId = parseInt(phoneNumberIdMatch[1], 10);
const trustedPhoneNumber = Resources.state().trustedPhoneNumbers?.find(phoneNumber => phoneNumber.id === phoneNumberId);
this.mfaMethod.update(methodString, phoneNumberId, trustedPhoneNumber?.nonFTEU);
} else {
this.mfaMethod.update(methodString);
}
Resources.emit(iCPSEventMFA.MFA_RESEND, this.mfaMethod);
return {
code: 200,
header: {
"Content-Type": `application/json`
},
body: {
message: `Requesting MFA resend with method ${this.mfaMethod}`
}
}
}
handlePushSubscription(_url: URL, data?: string): WebServerResponse {
try {
const pushSubscriptionData = Resources.validator().validatePushSubscription(jsonc.parse(data ?? ``));
Resources.manager().addNotificationSubscription(pushSubscriptionData);
return {
code: 201,
header: {
"Content-Type": `application/json`
},
body: {
message: `Push subscription added successfully`
}
}
} catch (err) {
Resources.logger(this).error(`Unable to register push subscription: ${err}`);
return {
code: 400,
header: {
"Content-Type": `application/json`
},
body: {
message: `Unable to add push subscription`
}
}
}
}
handleStateView(): WebServerResponse {
return {
code: 200,
header: {
"Content-Type": `text/html`
},
body: new StateView().asHtml()
}
}
handleSubmitMFAView(): WebServerResponse {
if (Resources.state().state !== StateType.BLOCKED) {
Resources.logger(this).warn(`Submit MFA view requested, but not waiting for it. Redirecting to state view.`);
return {
code: 302,
header: {
"Content-Type": `text/plain`,
Location: `${Resources.manager().webBasePath}/state`
},
body: {}
}
}
return {
code: 200,
header: {
"Content-Type": `text/html`
},
body: new SubmitMfaView().asHtml()
}
}
handleRequestMFAView(): WebServerResponse {
if (Resources.state().state !== StateType.BLOCKED) {
Resources.logger(this).warn(`Request MFA view requested, but not waiting for it. Redirecting to state view.`);
return {
code: 302,
header: {
"Content-Type": `text/plain`,
Location: `${Resources.manager().webBasePath}/state`
},
body: {}
}
}
return {
code: 200,
header: {
"Content-Type": `text/html`
},
body: new RequestMfaView().asHtml()
}
}
} |