419 lines
13 KiB
JavaScript
419 lines
13 KiB
JavaScript
/**
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* Duo Web SDK v2
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* Copyright 2017, Duo Security
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*/
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var Duo;
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(function (root, factory) {
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// Browser globals (root is window)
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var d = factory();
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// If the Javascript was loaded via a script tag, attempt to autoload
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// the frame.
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d._onReady(d.init);
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// Attach Duo to the `window` object
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root.Duo = Duo = d;
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}(window, function () {
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var DUO_MESSAGE_FORMAT = /^(?:AUTH|ENROLL)+\|[A-Za-z0-9\+\/=]+\|[A-Za-z0-9\+\/=]+$/;
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var DUO_ERROR_FORMAT = /^ERR\|[\w\s\.\(\)]+$/;
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var DUO_OPEN_WINDOW_FORMAT = /^DUO_OPEN_WINDOW\|/;
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var VALID_OPEN_WINDOW_DOMAINS = [
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'duo.com',
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'duosecurity.com',
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'duomobile.s3-us-west-1.amazonaws.com'
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];
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var iframeId = 'duo_iframe',
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postAction = '',
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postArgument = 'sig_response',
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host,
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sigRequest,
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duoSig,
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appSig,
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iframe,
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submitCallback;
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function throwError(message, url) {
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throw new Error(
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'Duo Web SDK error: ' + message +
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(url ? ('\n' + 'See ' + url + ' for more information') : '')
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);
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}
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function hyphenize(str) {
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return str.replace(/([a-z])([A-Z])/, '$1-$2').toLowerCase();
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}
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// cross-browser data attributes
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function getDataAttribute(element, name) {
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if ('dataset' in element) {
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return element.dataset[name];
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} else {
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return element.getAttribute('data-' + hyphenize(name));
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}
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}
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// cross-browser event binding/unbinding
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function on(context, event, fallbackEvent, callback) {
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if ('addEventListener' in window) {
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context.addEventListener(event, callback, false);
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} else {
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context.attachEvent(fallbackEvent, callback);
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}
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}
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function off(context, event, fallbackEvent, callback) {
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if ('removeEventListener' in window) {
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context.removeEventListener(event, callback, false);
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} else {
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context.detachEvent(fallbackEvent, callback);
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}
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}
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function onReady(callback) {
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on(document, 'DOMContentLoaded', 'onreadystatechange', callback);
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}
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function offReady(callback) {
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off(document, 'DOMContentLoaded', 'onreadystatechange', callback);
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}
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function onMessage(callback) {
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on(window, 'message', 'onmessage', callback);
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}
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function offMessage(callback) {
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off(window, 'message', 'onmessage', callback);
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}
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/**
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* Parse the sig_request parameter, throwing errors if the token contains
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* a server error or if the token is invalid.
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*
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* @param {String} sig Request token
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*/
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function parseSigRequest(sig) {
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if (!sig) {
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// nothing to do
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return;
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}
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// see if the token contains an error, throwing it if it does
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if (sig.indexOf('ERR|') === 0) {
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throwError(sig.split('|')[1]);
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}
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// validate the token
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if (sig.indexOf(':') === -1 || sig.split(':').length !== 2) {
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throwError(
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'Duo was given a bad token. This might indicate a configuration ' +
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'problem with one of Duo\'s client libraries.',
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'https://www.duosecurity.com/docs/duoweb#first-steps'
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);
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}
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var sigParts = sig.split(':');
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// hang on to the token, and the parsed duo and app sigs
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sigRequest = sig;
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duoSig = sigParts[0];
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appSig = sigParts[1];
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return {
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sigRequest: sig,
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duoSig: sigParts[0],
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appSig: sigParts[1]
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};
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}
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/**
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* This function is set up to run when the DOM is ready, if the iframe was
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* not available during `init`.
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*/
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function onDOMReady() {
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iframe = document.getElementById(iframeId);
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if (!iframe) {
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throw new Error(
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'This page does not contain an iframe for Duo to use.' +
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'Add an element like <iframe id="duo_iframe"></iframe> ' +
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'to this page. ' +
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'See https://www.duosecurity.com/docs/duoweb#3.-show-the-iframe ' +
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'for more information.'
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);
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}
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// we've got an iframe, away we go!
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ready();
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// always clean up after yourself
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offReady(onDOMReady);
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}
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/**
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* Validate that a MessageEvent came from the Duo service, and that it
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* is a properly formatted payload.
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*
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* The Google Chrome sign-in page injects some JS into pages that also
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* make use of postMessage, so we need to do additional validation above
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* and beyond the origin.
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*
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* @param {MessageEvent} event Message received via postMessage
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*/
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function isDuoMessage(event) {
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return Boolean(
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event.origin === ('https://' + host) &&
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typeof event.data === 'string' &&
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(
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event.data.match(DUO_MESSAGE_FORMAT) ||
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event.data.match(DUO_ERROR_FORMAT) ||
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event.data.match(DUO_OPEN_WINDOW_FORMAT)
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)
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);
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}
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/**
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* Validate the request token and prepare for the iframe to become ready.
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*
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* All options below can be passed into an options hash to `Duo.init`, or
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* specified on the iframe using `data-` attributes.
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*
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* Options specified using the options hash will take precedence over
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* `data-` attributes.
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*
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* Example using options hash:
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* ```javascript
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* Duo.init({
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* iframe: "some_other_id",
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* host: "api-main.duo.test",
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* sig_request: "...",
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* post_action: "/auth",
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* post_argument: "resp"
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* });
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* ```
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*
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* Example using `data-` attributes:
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* ```
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* <iframe id="duo_iframe"
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* data-host="api-main.duo.test"
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* data-sig-request="..."
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* data-post-action="/auth"
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* data-post-argument="resp"
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* >
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* </iframe>
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* ```
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*
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* @param {Object} options
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* @param {String} options.iframe The iframe, or id of an iframe to set up
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* @param {String} options.host Hostname
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* @param {String} options.sig_request Request token
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* @param {String} [options.post_action=''] URL to POST back to after successful auth
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* @param {String} [options.post_argument='sig_response'] Parameter name to use for response token
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* @param {Function} [options.submit_callback] If provided, duo will not submit the form instead execute
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* the callback function with reference to the "duo_form" form object
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* submit_callback can be used to prevent the webpage from reloading.
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*/
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function init(options) {
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if (options) {
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if (options.host) {
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host = options.host;
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}
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if (options.sig_request) {
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parseSigRequest(options.sig_request);
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}
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if (options.post_action) {
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postAction = options.post_action;
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}
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if (options.post_argument) {
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postArgument = options.post_argument;
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}
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if (options.iframe) {
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if (options.iframe.tagName) {
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iframe = options.iframe;
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} else if (typeof options.iframe === 'string') {
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iframeId = options.iframe;
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}
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}
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if (typeof options.submit_callback === 'function') {
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submitCallback = options.submit_callback;
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}
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}
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// if we were given an iframe, no need to wait for the rest of the DOM
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if (false && iframe) {
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ready();
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} else {
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// try to find the iframe in the DOM
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iframe = document.getElementById(iframeId);
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// iframe is in the DOM, away we go!
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if (iframe) {
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ready();
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} else {
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// wait until the DOM is ready, then try again
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onReady(onDOMReady);
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}
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}
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// always clean up after yourself!
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offReady(init);
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}
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/**
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* This function is called when a message was received from another domain
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* using the `postMessage` API. Check that the event came from the Duo
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* service domain, and that the message is a properly formatted payload,
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* then perform the post back to the primary service.
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*
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* @param event Event object (contains origin and data)
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*/
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function onReceivedMessage(event) {
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if (isDuoMessage(event)) {
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if (event.data.match(DUO_OPEN_WINDOW_FORMAT)) {
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var url = event.data.substring("DUO_OPEN_WINDOW|".length);
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if (isValidUrlToOpen(url)) {
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// Open the URL that comes after the DUO_WINDOW_OPEN token.
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window.open(url, "_self");
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}
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}
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else {
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// the event came from duo, do the post back
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doPostBack(event.data);
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// always clean up after yourself!
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offMessage(onReceivedMessage);
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}
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}
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}
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/**
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* Validate that this passed in URL is one that we will actually allow to
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* be opened.
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* @param url String URL that the message poster wants to open
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* @returns {boolean} true if we allow this url to be opened in the window
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*/
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function isValidUrlToOpen(url) {
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if (!url) {
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return false;
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}
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var parser = document.createElement('a');
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parser.href = url;
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if (parser.protocol === "duotrustedendpoints:") {
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return true;
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} else if (parser.protocol !== "https:") {
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return false;
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}
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for (var i = 0; i < VALID_OPEN_WINDOW_DOMAINS.length; i++) {
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if (parser.hostname.endsWith("." + VALID_OPEN_WINDOW_DOMAINS[i]) ||
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parser.hostname === VALID_OPEN_WINDOW_DOMAINS[i]) {
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return true;
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}
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}
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return false;
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}
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/**
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* Point the iframe at Duo, then wait for it to postMessage back to us.
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*/
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function ready() {
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if (!host) {
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host = getDataAttribute(iframe, 'host');
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if (!host) {
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throwError(
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'No API hostname is given for Duo to use. Be sure to pass ' +
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'a `host` parameter to Duo.init, or through the `data-host` ' +
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'attribute on the iframe element.',
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'https://www.duosecurity.com/docs/duoweb#3.-show-the-iframe'
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);
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}
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}
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if (!duoSig || !appSig) {
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parseSigRequest(getDataAttribute(iframe, 'sigRequest'));
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if (!duoSig || !appSig) {
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throwError(
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'No valid signed request is given. Be sure to give the ' +
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'`sig_request` parameter to Duo.init, or use the ' +
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'`data-sig-request` attribute on the iframe element.',
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'https://www.duosecurity.com/docs/duoweb#3.-show-the-iframe'
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);
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}
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}
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// if postAction/Argument are defaults, see if they are specified
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// as data attributes on the iframe
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if (postAction === '') {
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postAction = getDataAttribute(iframe, 'postAction') || postAction;
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}
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if (postArgument === 'sig_response') {
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postArgument = getDataAttribute(iframe, 'postArgument') || postArgument;
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}
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// point the iframe at Duo
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iframe.src = [
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'https://', host, '/frame/web/v1/auth?tx=', duoSig,
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'&parent=', encodeURIComponent(document.location.href),
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'&v=2.6'
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].join('');
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// listen for the 'message' event
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onMessage(onReceivedMessage);
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}
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/**
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* We received a postMessage from Duo. POST back to the primary service
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* with the response token, and any additional user-supplied parameters
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* given in form#duo_form.
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*/
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function doPostBack(response) {
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// create a hidden input to contain the response token
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var input = document.createElement('input');
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input.type = 'hidden';
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input.name = postArgument;
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input.value = response + ':' + appSig;
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// user may supply their own form with additional inputs
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var form = document.getElementById('duo_form');
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// if the form doesn't exist, create one
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if (!form) {
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form = document.createElement('form');
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// insert the new form after the iframe
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iframe.parentElement.insertBefore(form, iframe.nextSibling);
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}
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// make sure we are actually posting to the right place
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form.method = 'POST';
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form.action = postAction;
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// add the response token input to the form
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form.appendChild(input);
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// away we go!
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if (typeof submitCallback === "function") {
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submitCallback.call(null, form);
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} else {
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form.submit();
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}
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}
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return {
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init: init,
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_onReady: onReady,
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_parseSigRequest: parseSigRequest,
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_isDuoMessage: isDuoMessage,
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_doPostBack: doPostBack
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};
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}));
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