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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 handler using USB gnubbies.
*/
'use strict';
var CORRUPT_sign = false;
/**
* @param {!SignHelperRequest} request The sign request.
* @constructor
* @implements {RequestHandler}
*/
function UsbSignHandler(request) {
/** @private {!SignHelperRequest} */
this.request_ = request;
/** @private {boolean} */
this.notified_ = false;
/** @private {boolean} */
this.anyGnubbiesFound_ = false;
/** @private {!Array<!Gnubby>} */
this.notEnrolledGnubbies_ = [];
}
/**
* Default timeout value in case the caller never provides a valid timeout.
* @const
*/
UsbSignHandler.DEFAULT_TIMEOUT_MILLIS = 30 * 1000;
/**
* Attempts to run this handler's request.
* @param {RequestHandlerCallback} cb Called with the result of the request and
* an optional source for the sign result.
* @return {boolean} whether this set of challenges was accepted.
*/
UsbSignHandler.prototype.run = function(cb) {
if (this.cb_) {
// Can only handle one request.
return false;
}
/** @private {RequestHandlerCallback} */
this.cb_ = cb;
if (!this.request_.signData || !this.request_.signData.length) {
// Fail a sign request with an empty set of challenges.
return false;
}
var timeoutMillis =
this.request_.timeoutSeconds ?
this.request_.timeoutSeconds * 1000 :
UsbSignHandler.DEFAULT_TIMEOUT_MILLIS;
/** @private {MultipleGnubbySigner} */
this.signer_ = new MultipleGnubbySigner(
false /* forEnroll */,
this.signerCompleted_.bind(this),
this.signerFoundGnubby_.bind(this),
timeoutMillis,
this.request_.logMsgUrl);
return this.signer_.doSign(this.request_.signData);
};
/**
* Called when a MultipleGnubbySigner completes.
* @param {boolean} anyPending Whether any gnubbies are pending.
* @private
*/
UsbSignHandler.prototype.signerCompleted_ = function(anyPending) {
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
*/
UsbSignHandler.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 (SingleGnubbySigner.signErrorIndicatesInvalidKeyHandle(
signResult.code)) {
var gnubby = signResult['gnubby'];
this.notEnrolledGnubbies_.push(gnubby);
this.sendBogusEnroll_(gnubby);
} 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;
}
};
/** @const */
UsbSignHandler.BOGUS_APP_ID_HASH = [
0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41,
0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41,
0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41,
0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41
];
/** @const */
UsbSignHandler.BOGUS_CHALLENGE_V1 = [
0x04, 0xA2, 0x24, 0x7D, 0x5C, 0x0B, 0x76, 0xF1,
0xDC, 0xCD, 0x44, 0xAF, 0x91, 0x9A, 0xA2, 0x3F,
0x3F, 0xBA, 0x65, 0x9F, 0x06, 0x78, 0x82, 0xFB,
0x93, 0x4B, 0xBF, 0x86, 0x55, 0x95, 0x66, 0x46,
0x76, 0x90, 0xDC, 0xE1, 0xE8, 0x6C, 0x86, 0x86,
0xC3, 0x03, 0x4E, 0x65, 0x52, 0x4C, 0x32, 0x6F,
0xB6, 0x44, 0x0D, 0x50, 0xF9, 0x16, 0xC0, 0xA3,
0xDA, 0x31, 0x4B, 0xD3, 0x3F, 0x94, 0xA5, 0xF1,
0xD3
];
/** @const */
UsbSignHandler.BOGUS_CHALLENGE_V2 = [
0x42, 0x42, 0x42, 0x42, 0x42, 0x42, 0x42, 0x42,
0x42, 0x42, 0x42, 0x42, 0x42, 0x42, 0x42, 0x42,
0x42, 0x42, 0x42, 0x42, 0x42, 0x42, 0x42, 0x42,
0x42, 0x42, 0x42, 0x42, 0x42, 0x42, 0x42, 0x42
];
/**
* Sends a bogus enroll command to the not-enrolled gnubby, to force the user
* to tap the gnubby before revealing its state to the caller.
* @param {Gnubby} gnubby The gnubby to "enroll" on.
* @private
*/
UsbSignHandler.prototype.sendBogusEnroll_ = function(gnubby) {
var self = this;
gnubby.version(function(rc, opt_data) {
if (rc) {
self.notifyError_(rc);
return;
}
var enrollChallenge;
var version = UTIL_BytesToString(new Uint8Array(opt_data || []));
switch (version) {
case Gnubby.U2F_V1:
enrollChallenge = UsbSignHandler.BOGUS_CHALLENGE_V1;
break;
case Gnubby.U2F_V2:
enrollChallenge = UsbSignHandler.BOGUS_CHALLENGE_V2;
break;
default:
self.notifyError_(DeviceStatusCodes.INVALID_DATA_STATUS);
}
gnubby.enroll(
/** @type {Array<number>} */ (enrollChallenge),
UsbSignHandler.BOGUS_APP_ID_HASH,
self.enrollCallback_.bind(self, gnubby));
});
};
/**
* Called with the result of the (bogus, tap capturing) enroll command.
* @param {Gnubby} gnubby The gnubby "enrolled".
* @param {number} code The result of the enroll command.
* @param {ArrayBuffer=} infoArray Returned data.
* @private
*/
UsbSignHandler.prototype.enrollCallback_ = function(gnubby, code, infoArray) {
if (this.notified_)
return;
switch (code) {
case DeviceStatusCodes.WAIT_TOUCH_STATUS:
this.sendBogusEnroll_(gnubby);
return;
case DeviceStatusCodes.OK_STATUS:
// Got a successful enroll => user tapped gnubby.
// Send a WRONG_DATA_STATUS finally. (The gnubby is implicitly closed
// by notifyError_.)
this.notifyError_(DeviceStatusCodes.WRONG_DATA_STATUS);
return;
}
};
/**
* Reports the result of a successful sign operation.
* @param {Gnubby} gnubby Gnubby instance
* @param {SignHelperChallenge} challenge Challenge signed
* @param {Uint8Array} info Result data
* @private
*/
UsbSignHandler.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
*/
UsbSignHandler.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.
*/
UsbSignHandler.prototype.close = function() {
while (this.notEnrolledGnubbies_.length != 0) {
var gnubby = this.notEnrolledGnubbies_.shift();
gnubby.closeWhenIdle();
}
if (this.signer_) {
this.signer_.close();
this.signer_ = null;
}
};
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