gecko/dom/media/IdpSandbox.jsm

246 lines
7.8 KiB
JavaScript

/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
'use strict';
const {
classes: Cc,
interfaces: Ci,
utils: Cu,
results: Cr
} = Components;
Cu.import('resource://gre/modules/Services.jsm');
Cu.import('resource://gre/modules/XPCOMUtils.jsm');
/** This little class ensures that redirects maintain an https:// origin */
function RedirectHttpsOnly() {}
RedirectHttpsOnly.prototype = {
asyncOnChannelRedirect: function(oldChannel, newChannel, flags, callback) {
if (newChannel.URI.scheme !== 'https') {
callback.onRedirectVerifyCallback(Cr.NS_ERROR_ABORT);
} else {
callback.onRedirectVerifyCallback(Cr.NS_OK);
}
},
getInterface: function(iid) {
return this.QueryInterface(iid);
},
QueryInterface: XPCOMUtils.generateQI([Ci.nsIChannelEventSink])
};
/** This class loads a resource into a single string. ResourceLoader.load() is
* the entry point. */
function ResourceLoader(res, rej) {
this.resolve = res;
this.reject = rej;
this.data = '';
}
/** Loads the identified https:// URL. */
ResourceLoader.load = function(uri, doc) {
return new Promise((resolve, reject) => {
let listener = new ResourceLoader(resolve, reject);
let ioService = Cc['@mozilla.org/network/io-service;1']
.getService(Ci.nsIIOService);
let systemPrincipal = Services.scriptSecurityManager.getSystemPrincipal();
// the '2' identifies this as a script load
let ioChannel = ioService.newChannelFromURI2(uri, doc, doc.nodePrincipal,
systemPrincipal, 0,
Ci.nsIContentPolicy.TYPE_SCRIPT);
ioChannel.loadGroup = doc.documentLoadGroup.QueryInterface(Ci.nsILoadGroup);
ioChannel.notificationCallbacks = new RedirectHttpsOnly();
ioChannel.asyncOpen(listener, null);
});
};
ResourceLoader.prototype = {
onDataAvailable: function(request, context, input, offset, count) {
let stream = Cc['@mozilla.org/scriptableinputstream;1']
.createInstance(Ci.nsIScriptableInputStream);
stream.init(input);
this.data += stream.read(count);
},
onStartRequest: function (request, context) {},
onStopRequest: function(request, context, status) {
if (Components.isSuccessCode(status)) {
var statusCode = request.QueryInterface(Ci.nsIHttpChannel).responseStatus;
if (statusCode === 200) {
this.resolve({ request: request, data: this.data });
} else {
this.reject(new Error('Non-200 response from server: ' + statusCode));
}
} else {
this.reject(new Error('Load failed: ' + status));
}
},
getInterface: function(iid) {
return this.QueryInterface(iid);
},
QueryInterface: XPCOMUtils.generateQI([Ci.nsIStreamListener])
};
/**
* A simple implementation of the WorkerLocation interface.
*/
function createLocationFromURI(uri) {
return {
href: uri.spec,
protocol: uri.scheme + ':',
host: uri.host + ((uri.port >= 0) ?
(':' + uri.port) : ''),
port: uri.port,
hostname: uri.host,
pathname: uri.path.replace(/[#\?].*/, ''),
search: uri.path.replace(/^[^\?]*/, '').replace(/#.*/, ''),
hash: uri.hasRef ? ('#' + uri.ref) : '',
origin: uri.prePath,
toString: function() {
return uri.spec;
}
};
}
/**
* A javascript sandbox for running an IdP.
*
* @param domain (string) the domain of the IdP
* @param protocol (string?) the protocol of the IdP [default: 'default']
* @param doc (obj) the current document
* @throws if the domain or protocol aren't valid
*/
function IdpSandbox(domain, protocol, doc) {
this.source = IdpSandbox.createIdpUri(domain, protocol || "default");
this.active = null;
this.sandbox = null;
this.document = doc;
}
IdpSandbox.checkDomain = function(domain) {
if (!domain || typeof domain !== 'string') {
throw new Error('Invalid domain for identity provider: ' +
'must be a non-zero length string');
}
};
/**
* Checks that the IdP protocol is superficially sane. In particular, we don't
* want someone adding relative paths (e.g., '../../myuri'), which could be used
* to move outside of /.well-known/ and into space that they control.
*/
IdpSandbox.checkProtocol = function(protocol) {
let message = 'Invalid protocol for identity provider: ';
if (!protocol || typeof protocol !== 'string') {
throw new Error(message + 'must be a non-zero length string');
}
if (decodeURIComponent(protocol).match(/[\/\\]/)) {
throw new Error(message + "must not include '/' or '\\'");
}
};
/**
* Turns a domain and protocol into a URI. This does some aggressive checking
* to make sure that we aren't being fooled somehow. Throws on fooling.
*/
IdpSandbox.createIdpUri = function(domain, protocol) {
IdpSandbox.checkDomain(domain);
IdpSandbox.checkProtocol(protocol);
let message = 'Invalid IdP parameters: ';
try {
let wkIdp = 'https://' + domain + '/.well-known/idp-proxy/' + protocol;
let ioService = Components.classes['@mozilla.org/network/io-service;1']
.getService(Ci.nsIIOService);
let uri = ioService.newURI(wkIdp, null, null);
if (uri.hostPort !== domain) {
throw new Error(message + 'domain is invalid');
}
if (uri.path.indexOf('/.well-known/idp-proxy/') !== 0) {
throw new Error(message + 'must produce a /.well-known/idp-proxy/ URI');
}
return uri;
} catch (e if (typeof e.result !== 'undefined' &&
e.result === Cr.NS_ERROR_MALFORMED_URI)) {
throw new Error(message + 'must produce a valid URI');
}
};
IdpSandbox.prototype = {
isSame: function(domain, protocol) {
return this.source.spec === IdpSandbox.createIdpUri(domain, protocol).spec;
},
start: function() {
if (!this.active) {
this.active = ResourceLoader.load(this.source, this.document)
.then(result => this._createSandbox(result));
}
return this.active;
},
// Provides the sandbox with some useful facilities. Initially, this is only
// a minimal set; it is far easier to add more as the need arises, than to
// take them back if we discover a mistake.
_populateSandbox: function(uri) {
this.sandbox.location = Cu.cloneInto(createLocationFromURI(uri),
this.sandbox,
{ cloneFunctions: true });
},
_createSandbox: function(result) {
let principal = Services.scriptSecurityManager
.getChannelResultPrincipal(result.request);
this.sandbox = Cu.Sandbox(principal, {
sandboxName: 'IdP-' + this.source.host,
wantComponents: false,
wantExportHelpers: false,
wantGlobalProperties: [
'indexedDB', 'XMLHttpRequest', 'TextEncoder', 'TextDecoder',
'URL', 'URLSearchParams', 'atob', 'btoa', 'Blob', 'crypto',
'rtcIdentityProvider'
]
});
let registrar = this.sandbox.rtcIdentityProvider;
if (!Cu.isXrayWrapper(registrar)) {
throw new Error('IdP setup failed');
}
// have to use the ultimate URI, not the starting one to avoid
// that origin stealing from the one that redirected to it
this._populateSandbox(result.request.URI);
// putting a javascript version of 1.8 here seems fragile
Cu.evalInSandbox(result.data, this.sandbox,
'1.8', result.request.URI.spec, 1);
if (!registrar.idp) {
throw new Error('IdP failed to call rtcIdentityProvider.register()');
}
return registrar;
},
stop: function() {
if (this.sandbox) {
Cu.nukeSandbox(this.sandbox);
}
this.sandbox = null;
this.active = null;
},
toString: function() {
return this.source.spec;
}
};
this.EXPORTED_SYMBOLS = ['IdpSandbox'];
this.IdpSandbox = IdpSandbox;