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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
/**
* @fileoverview Implements a sign helper using USB gnubbies.
*/
'use strict';
var CORRUPT_sign = false;
/**
* @param {!GnubbyFactory} gnubbyFactory Factory for gnubby instances
* @param {!CountdownFactory} timerFactory A factory to create timers.
* @constructor
* @implements {SignHelper}
*/
function UsbSignHelper(gnubbyFactory, timerFactory) {
/** @private {!GnubbyFactory} */
this.gnubbyFactory_ = gnubbyFactory;
/** @private {!CountdownFactory} */
this.timerFactory_ = timerFactory;
/** @private {Array.<usbGnubby>} */
this.waitingForTouchGnubbies_ = [];
/** @private {boolean} */
this.notified_ = false;
/** @private {boolean} */
this.signerComplete_ = false;
/** @private {boolean} */
this.anyGnubbiesFound_ = false;
}
/**
* Default timeout value in case the caller never provides a valid timeout.
* @const
*/
UsbSignHelper.DEFAULT_TIMEOUT_MILLIS = 30 * 1000;
/**
* Attempts to sign the provided challenges.
* @param {SignHelperRequest} request The sign request.
* @param {function(SignHelperReply, string=)} cb Called with the result of the
* sign request and an optional source for the sign result.
* @return {boolean} whether this set of challenges was accepted.
*/
UsbSignHelper.prototype.doSign = function(request, cb) {
if (this.cb_) {
// Can only handle one request.
return false;
}
/** @private {function(SignHelperReply, string=)} */
this.cb_ = cb;
if (!request.signData || !request.signData.length) {
// Fail a sign request with an empty set of challenges, and pretend to have
// alerted the caller in case the enumerate is still pending.
this.notified_ = true;
return false;
}
var timeoutMillis =
request.timeout ?
request.timeout * 1000 :
UsbSignHelper.DEFAULT_TIMEOUT_MILLIS;
/** @private {MultipleGnubbySigner} */
this.signer_ = new MultipleGnubbySigner(
this.gnubbyFactory_,
this.timerFactory_,
false /* forEnroll */,
this.signerCompleted_.bind(this),
this.signerFoundGnubby_.bind(this),
timeoutMillis,
request.logMsgUrl);
return this.signer_.doSign(request.signData);
};
/**
* Called when a MultipleGnubbySigner completes.
* @param {boolean} anyPending Whether any gnubbies are pending.
* @private
*/
UsbSignHelper.prototype.signerCompleted_ = function(anyPending) {
this.signerComplete_ = true;
if (!this.anyGnubbiesFound_ || anyPending) {
this.notifyError_(DeviceStatusCodes.TIMEOUT_STATUS);
} else if (this.signerError_ !== undefined) {
this.notifyError_(this.signerError_);
} else {
// Do nothing: signerFoundGnubby_ will have returned results from other
// gnubbies.
}
};
/**
* Called when a MultipleGnubbySigner finds a gnubby that has completed signing
* its challenges.
* @param {MultipleSignerResult} signResult Signer result object
* @param {boolean} moreExpected Whether the signer expects to produce more
* results.
* @private
*/
UsbSignHelper.prototype.signerFoundGnubby_ =
function(signResult, moreExpected) {
this.anyGnubbiesFound_ = true;
if (!signResult.code) {
var gnubby = signResult['gnubby'];
var challenge = signResult['challenge'];
var info = new Uint8Array(signResult['info']);
this.notifySuccess_(gnubby, challenge, info);
} else if (!moreExpected) {
// If the signer doesn't expect more results, return the error directly to
// the caller.
this.notifyError_(signResult.code);
} else {
// Record the last error, to report from the complete callback if no other
// eligible gnubbies are found.
/** @private {number} */
this.signerError_ = signResult.code;
}
};
/**
* Reports the result of a successful sign operation.
* @param {usbGnubby} gnubby Gnubby instance
* @param {SignHelperChallenge} challenge Challenge signed
* @param {Uint8Array} info Result data
* @private
*/
UsbSignHelper.prototype.notifySuccess_ = function(gnubby, challenge, info) {
if (this.notified_)
return;
this.notified_ = true;
gnubby.closeWhenIdle();
this.close();
if (CORRUPT_sign) {
CORRUPT_sign = false;
info[info.length - 1] = info[info.length - 1] ^ 0xff;
}
var responseData = {
'appIdHash': B64_encode(challenge['appIdHash']),
'challengeHash': B64_encode(challenge['challengeHash']),
'keyHandle': B64_encode(challenge['keyHandle']),
'signatureData': B64_encode(info)
};
var reply = {
'type': 'sign_helper_reply',
'code': DeviceStatusCodes.OK_STATUS,
'responseData': responseData
};
this.cb_(reply, 'USB');
};
/**
* Reports error to the caller.
* @param {number} code error to report
* @private
*/
UsbSignHelper.prototype.notifyError_ = function(code) {
if (this.notified_)
return;
this.notified_ = true;
this.close();
var reply = {
'type': 'sign_helper_reply',
'code': code
};
this.cb_(reply);
};
/**
* Closes the MultipleGnubbySigner, if any.
*/
UsbSignHelper.prototype.close = function() {
if (this.signer_) {
this.signer_.close();
this.signer_ = null;
}
for (var i = 0; i < this.waitingForTouchGnubbies_.length; i++) {
this.waitingForTouchGnubbies_[i].closeWhenIdle();
}
this.waitingForTouchGnubbies_ = [];
};
/**
* @param {!GnubbyFactory} gnubbyFactory Factory to create gnubbies.
* @param {!CountdownFactory} timerFactory A factory to create timers.
* @constructor
* @implements {SignHelperFactory}
*/
function UsbSignHelperFactory(gnubbyFactory, timerFactory) {
/** @private {!GnubbyFactory} */
this.gnubbyFactory_ = gnubbyFactory;
/** @private {!CountdownFactory} */
this.timerFactory_ = timerFactory;
}
/**
* @return {UsbSignHelper} the newly created helper.
*/
UsbSignHelperFactory.prototype.createHelper = function() {
return new UsbSignHelper(this.gnubbyFactory_, this.timerFactory_);
};
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