summaryrefslogtreecommitdiffstats
path: root/dom/u2f/U2F.cpp
blob: abc0a9bbb8bd5bceecab753f8e60b11141258de4 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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/. */

#include "mozilla/dom/U2F.h"
#include "mozilla/dom/WebCryptoCommon.h"
#include "mozilla/ipc/PBackgroundChild.h"
#include "mozilla/ipc/BackgroundChild.h"
#include "mozilla/dom/WebAuthnTransactionChild.h"
#include "mozilla/dom/WebAuthnUtil.h"
#include "nsContentUtils.h"
#include "nsICryptoHash.h"
#include "nsIEffectiveTLDService.h"
#include "nsNetCID.h"
#include "nsNetUtil.h"
#include "nsURLParsers.h"
#include "U2FUtil.h"
#include "hasht.h"

using namespace mozilla::ipc;

// Forward decl because of nsHTMLDocument.h's complex dependency on
// /layout/style
class nsHTMLDocument {
 public:
  bool IsRegistrableDomainSuffixOfOrEqualTo(const nsAString& aHostSuffixString,
                                            const nsACString& aOrigHost);
};

namespace mozilla {
namespace dom {

static mozilla::LazyLogModule gU2FLog("u2fmanager");

NS_NAMED_LITERAL_STRING(kFinishEnrollment, "navigator.id.finishEnrollment");
NS_NAMED_LITERAL_STRING(kGetAssertion, "navigator.id.getAssertion");

// Bug #1436078 - Permit Google Accounts. Remove in Bug #1436085 in Jan 2023.
NS_NAMED_LITERAL_STRING(kGoogleAccountsAppId1,
                        "https://www.gstatic.com/securitykey/origins.json");
NS_NAMED_LITERAL_STRING(
    kGoogleAccountsAppId2,
    "https://www.gstatic.com/securitykey/a/google.com/origins.json");

NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(U2F)
  NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
  NS_INTERFACE_MAP_ENTRY(nsISupports)
  NS_INTERFACE_MAP_ENTRY(nsIDOMEventListener)
NS_INTERFACE_MAP_END

NS_IMPL_CYCLE_COLLECTING_ADDREF(U2F)
NS_IMPL_CYCLE_COLLECTING_RELEASE(U2F)

NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(U2F, mParent)

/***********************************************************************
 * Utility Functions
 **********************************************************************/

static ErrorCode ConvertNSResultToErrorCode(const nsresult& aError) {
  if (aError == NS_ERROR_DOM_TIMEOUT_ERR) {
    return ErrorCode::TIMEOUT;
  }
  /* Emitted by U2F{Soft,HID}TokenManager when we really mean ineligible */
  if (aError == NS_ERROR_DOM_INVALID_STATE_ERR) {
    return ErrorCode::DEVICE_INELIGIBLE;
  }
  return ErrorCode::OTHER_ERROR;
}

static uint32_t AdjustedTimeoutMillis(
    const Optional<Nullable<int32_t>>& opt_aSeconds) {
  uint32_t adjustedTimeoutMillis = 30000u;
  if (opt_aSeconds.WasPassed() && !opt_aSeconds.Value().IsNull()) {
    adjustedTimeoutMillis = opt_aSeconds.Value().Value() * 1000u;
    adjustedTimeoutMillis = std::max(15000u, adjustedTimeoutMillis);
    adjustedTimeoutMillis = std::min(120000u, adjustedTimeoutMillis);
  }
  return adjustedTimeoutMillis;
}

static nsresult AssembleClientData(const nsAString& aOrigin,
                                   const nsAString& aTyp,
                                   const nsAString& aChallenge,
                                   /* out */ nsString& aClientData) {
  MOZ_ASSERT(NS_IsMainThread());
  U2FClientData clientDataObject;
  clientDataObject.mTyp.Construct(aTyp);  // "Typ" from the U2F specification
  clientDataObject.mChallenge.Construct(aChallenge);
  clientDataObject.mOrigin.Construct(aOrigin);

  if (NS_WARN_IF(!clientDataObject.ToJSON(aClientData))) {
    return NS_ERROR_FAILURE;
  }

  return NS_OK;
}

static void RegisteredKeysToScopedCredentialList(
    const nsAString& aAppId, const nsTArray<RegisteredKey>& aKeys,
    nsTArray<WebAuthnScopedCredential>& aList) {
  for (const RegisteredKey& key : aKeys) {
    // Check for required attributes
    if (!key.mVersion.WasPassed() || !key.mKeyHandle.WasPassed() ||
        key.mVersion.Value() != kRequiredU2FVersion) {
      continue;
    }

    // If this key's mAppId doesn't match the invocation, we can't handle it.
    if (key.mAppId.WasPassed() && !key.mAppId.Value().Equals(aAppId)) {
      continue;
    }

    CryptoBuffer keyHandle;
    nsresult rv = keyHandle.FromJwkBase64(key.mKeyHandle.Value());
    if (NS_WARN_IF(NS_FAILED(rv))) {
      continue;
    }

    WebAuthnScopedCredential c;
    c.id() = keyHandle;
    aList.AppendElement(c);
  }
}

static nsresult BuildTransactionHashes(
    const nsCString& aRpId, const nsCString& aClientDataJSON,
    /* out */ CryptoBuffer& aRpIdHash,
    /* out */ CryptoBuffer& aClientDataHash) {
  nsresult srv;
  nsCOMPtr<nsICryptoHash> hashService =
      do_CreateInstance(NS_CRYPTO_HASH_CONTRACTID, &srv);
  if (NS_FAILED(srv)) {
    return srv;
  }

  if (!aRpIdHash.SetLength(SHA256_LENGTH, fallible)) {
    return NS_ERROR_OUT_OF_MEMORY;
  }
  srv = HashCString(hashService, aRpId, aRpIdHash);
  if (NS_WARN_IF(NS_FAILED(srv))) {
    return NS_ERROR_FAILURE;
  }

  if (!aClientDataHash.SetLength(SHA256_LENGTH, fallible)) {
    return NS_ERROR_OUT_OF_MEMORY;
  }
  srv = HashCString(hashService, aClientDataJSON, aClientDataHash);
  if (NS_WARN_IF(NS_FAILED(srv))) {
    return NS_ERROR_FAILURE;
  }

  if (MOZ_LOG_TEST(gU2FLog, LogLevel::Debug)) {
    nsString base64;
    Unused << NS_WARN_IF(NS_FAILED(aRpIdHash.ToJwkBase64(base64)));

    MOZ_LOG(gU2FLog, LogLevel::Debug,
            ("dom::U2FManager::RpID: %s", aRpId.get()));

    MOZ_LOG(gU2FLog, LogLevel::Debug,
            ("dom::U2FManager::Rp ID Hash (base64): %s",
             NS_ConvertUTF16toUTF8(base64).get()));

    Unused << NS_WARN_IF(NS_FAILED(aClientDataHash.ToJwkBase64(base64)));

    MOZ_LOG(gU2FLog, LogLevel::Debug,
            ("dom::U2FManager::Client Data JSON: %s", aClientDataJSON.get()));

    MOZ_LOG(gU2FLog, LogLevel::Debug,
            ("dom::U2FManager::Client Data Hash (base64): %s",
             NS_ConvertUTF16toUTF8(base64).get()));
  }

  return NS_OK;
}

/***********************************************************************
 * U2F JavaScript API Implementation
 **********************************************************************/

U2F::~U2F() {
  MOZ_ASSERT(NS_IsMainThread());

  if (mTransaction.isSome()) {
    RejectTransaction(NS_ERROR_ABORT);
  }

  if (mChild) {
    RefPtr<WebAuthnTransactionChild> c;
    mChild.swap(c);
    c->Disconnect();
  }
}

void U2F::Init(ErrorResult& aRv) {
  MOZ_ASSERT(mParent);

  nsCOMPtr<nsIDocument> doc = mParent->GetDoc();
  MOZ_ASSERT(doc);
  if (!doc) {
    aRv.Throw(NS_ERROR_FAILURE);
    return;
  }

  nsIPrincipal* principal = doc->NodePrincipal();
  aRv = nsContentUtils::GetUTFOrigin(principal, mOrigin);
  if (NS_WARN_IF(aRv.Failed())) {
    return;
  }

  if (NS_WARN_IF(mOrigin.IsEmpty())) {
    aRv.Throw(NS_ERROR_FAILURE);
    return;
  }
}

/* virtual */ JSObject* U2F::WrapObject(JSContext* aCx,
                                        JS::Handle<JSObject*> aGivenProto) {
  return U2FBinding::Wrap(aCx, this, aGivenProto);
}

template <typename T, typename C>
void U2F::ExecuteCallback(T& aResp, nsMainThreadPtrHandle<C>& aCb) {
  MOZ_ASSERT(NS_IsMainThread());
  MOZ_ASSERT(aCb);

  // Assert that mTransaction was cleared before before we were called to allow
  // reentrancy from microtask checkpoints.
  MOZ_ASSERT(mTransaction.isNothing());

  ErrorResult error;
  aCb->Call(aResp, error);
  NS_WARNING_ASSERTION(!error.Failed(), "dom::U2F::Promise callback failed");
  error.SuppressException();  // Useful exceptions already emitted
}

void U2F::Register(const nsAString& aAppId,
                   const Sequence<RegisterRequest>& aRegisterRequests,
                   const Sequence<RegisteredKey>& aRegisteredKeys,
                   U2FRegisterCallback& aCallback,
                   const Optional<Nullable<int32_t>>& opt_aTimeoutSeconds,
                   ErrorResult& aRv) {
  MOZ_ASSERT(NS_IsMainThread());

  if (mTransaction.isSome()) {
    CancelTransaction(NS_ERROR_ABORT);
  }

  nsMainThreadPtrHandle<U2FRegisterCallback> callback(
      new nsMainThreadPtrHolder<U2FRegisterCallback>("U2F::Register::callback",
                                                     &aCallback));

  // Ensure we have a callback.
  if (NS_WARN_IF(!callback)) {
    return;
  }

  // Evaluate the AppID
  nsString adjustedAppId(aAppId);
  if (!EvaluateAppID(mParent, mOrigin, U2FOperation::Register, adjustedAppId)) {
    RegisterResponse response;
    response.mErrorCode.Construct(
        static_cast<uint32_t>(ErrorCode::BAD_REQUEST));
    ExecuteCallback(response, callback);
    return;
  }

  // Produce the AppParam from the current AppID
  nsCString cAppId = NS_ConvertUTF16toUTF8(adjustedAppId);

  nsAutoString clientDataJSON;

  // Pick the first valid RegisterRequest; we can only work with one.
  for (const RegisterRequest& req : aRegisterRequests) {
    if (!req.mChallenge.WasPassed() || !req.mVersion.WasPassed() ||
        req.mVersion.Value() != kRequiredU2FVersion) {
      continue;
    }

    nsresult rv = AssembleClientData(mOrigin, kFinishEnrollment,
                                     req.mChallenge.Value(), clientDataJSON);
    if (NS_WARN_IF(NS_FAILED(rv))) {
      continue;
    }
  }

  // Did we not get a valid RegisterRequest? Abort.
  if (clientDataJSON.IsEmpty()) {
    RegisterResponse response;
    response.mErrorCode.Construct(
        static_cast<uint32_t>(ErrorCode::BAD_REQUEST));
    ExecuteCallback(response, callback);
    return;
  }

  // Build the exclusion list, if any
  nsTArray<WebAuthnScopedCredential> excludeList;
  RegisteredKeysToScopedCredentialList(adjustedAppId, aRegisteredKeys,
                                       excludeList);

  auto clientData = NS_ConvertUTF16toUTF8(clientDataJSON);

  CryptoBuffer rpIdHash, clientDataHash;
  if (NS_FAILED(BuildTransactionHashes(cAppId, clientData, rpIdHash,
                                       clientDataHash))) {
    RegisterResponse response;
    response.mErrorCode.Construct(
        static_cast<uint32_t>(ErrorCode::OTHER_ERROR));
    ExecuteCallback(response, callback);
    return;
  }

  if (!MaybeCreateBackgroundActor()) {
    RegisterResponse response;
    response.mErrorCode.Construct(
        static_cast<uint32_t>(ErrorCode::OTHER_ERROR));
    ExecuteCallback(response, callback);
    return;
  }

  ListenForVisibilityEvents();

  // Always blank for U2F
  nsTArray<WebAuthnExtension> extensions;

  // Default values for U2F.
  WebAuthnAuthenticatorSelection authSelection(
      false /* requireResidentKey */, false /* requireUserVerification */,
      false /* requirePlatformAttachment */);

  uint32_t adjustedTimeoutMillis = AdjustedTimeoutMillis(opt_aTimeoutSeconds);

  WebAuthnMakeCredentialInfo info(
      mOrigin, rpIdHash, clientDataHash, adjustedTimeoutMillis, excludeList,
      extensions, authSelection, false /* RequestDirectAttestation */);

  MOZ_ASSERT(mTransaction.isNothing());
  mTransaction = Some(U2FTransaction(clientData, Move(AsVariant(callback))));
  mChild->SendRequestRegister(mTransaction.ref().mId, info);
}

void U2F::FinishMakeCredential(const uint64_t& aTransactionId,
                               const WebAuthnMakeCredentialResult& aResult) {
  MOZ_ASSERT(NS_IsMainThread());

  // Check for a valid transaction.
  if (mTransaction.isNothing() || mTransaction.ref().mId != aTransactionId) {
    return;
  }

  if (NS_WARN_IF(!mTransaction.ref().HasRegisterCallback())) {
    RejectTransaction(NS_ERROR_ABORT);
    return;
  }

  CryptoBuffer clientDataBuf;
  if (NS_WARN_IF(!clientDataBuf.Assign(mTransaction.ref().mClientData))) {
    RejectTransaction(NS_ERROR_ABORT);
    return;
  }

  CryptoBuffer regBuf;
  if (NS_WARN_IF(!regBuf.Assign(aResult.RegBuffer()))) {
    RejectTransaction(NS_ERROR_ABORT);
    return;
  }

  nsString clientDataBase64;
  nsString registrationDataBase64;
  nsresult rvClientData = clientDataBuf.ToJwkBase64(clientDataBase64);
  nsresult rvRegistrationData = regBuf.ToJwkBase64(registrationDataBase64);

  if (NS_WARN_IF(NS_FAILED(rvClientData)) ||
      NS_WARN_IF(NS_FAILED(rvRegistrationData))) {
    RejectTransaction(NS_ERROR_ABORT);
    return;
  }

  // Assemble a response object to return
  RegisterResponse response;
  response.mVersion.Construct(kRequiredU2FVersion);
  response.mClientData.Construct(clientDataBase64);
  response.mRegistrationData.Construct(registrationDataBase64);
  response.mErrorCode.Construct(static_cast<uint32_t>(ErrorCode::OK));

  // Keep the callback pointer alive.
  nsMainThreadPtrHandle<U2FRegisterCallback> callback(
      mTransaction.ref().GetRegisterCallback());

  ClearTransaction();
  ExecuteCallback(response, callback);
}

void U2F::Sign(const nsAString& aAppId, const nsAString& aChallenge,
               const Sequence<RegisteredKey>& aRegisteredKeys,
               U2FSignCallback& aCallback,
               const Optional<Nullable<int32_t>>& opt_aTimeoutSeconds,
               ErrorResult& aRv) {
  MOZ_ASSERT(NS_IsMainThread());

  if (mTransaction.isSome()) {
    CancelTransaction(NS_ERROR_ABORT);
  }

  nsMainThreadPtrHandle<U2FSignCallback> callback(
      new nsMainThreadPtrHolder<U2FSignCallback>("U2F::Sign::callback",
                                                 &aCallback));

  // Ensure we have a callback.
  if (NS_WARN_IF(!callback)) {
    return;
  }

  // Evaluate the AppID
  nsString adjustedAppId(aAppId);
  if (!EvaluateAppID(mParent, mOrigin, U2FOperation::Sign, adjustedAppId)) {
    SignResponse response;
    response.mErrorCode.Construct(
        static_cast<uint32_t>(ErrorCode::BAD_REQUEST));
    ExecuteCallback(response, callback);
    return;
  }

  // Produce the AppParam from the current AppID
  nsCString cAppId = NS_ConvertUTF16toUTF8(adjustedAppId);

  nsAutoString clientDataJSON;
  nsresult rv =
      AssembleClientData(mOrigin, kGetAssertion, aChallenge, clientDataJSON);
  if (NS_WARN_IF(NS_FAILED(rv))) {
    SignResponse response;
    response.mErrorCode.Construct(
        static_cast<uint32_t>(ErrorCode::BAD_REQUEST));
    ExecuteCallback(response, callback);
    return;
  }

  // Build the key list, if any
  nsTArray<WebAuthnScopedCredential> permittedList;
  RegisteredKeysToScopedCredentialList(adjustedAppId, aRegisteredKeys,
                                       permittedList);

  auto clientData = NS_ConvertUTF16toUTF8(clientDataJSON);

  CryptoBuffer rpIdHash, clientDataHash;
  if (NS_FAILED(BuildTransactionHashes(cAppId, clientData, rpIdHash,
                                       clientDataHash))) {
    SignResponse response;
    response.mErrorCode.Construct(
        static_cast<uint32_t>(ErrorCode::OTHER_ERROR));
    ExecuteCallback(response, callback);
    return;
  }

  if (!MaybeCreateBackgroundActor()) {
    SignResponse response;
    response.mErrorCode.Construct(
        static_cast<uint32_t>(ErrorCode::OTHER_ERROR));
    ExecuteCallback(response, callback);
    return;
  }

  ListenForVisibilityEvents();

  // Always blank for U2F
  nsTArray<WebAuthnExtension> extensions;

  uint32_t adjustedTimeoutMillis = AdjustedTimeoutMillis(opt_aTimeoutSeconds);

  WebAuthnGetAssertionInfo info(mOrigin, rpIdHash, clientDataHash,
                                adjustedTimeoutMillis, permittedList,
                                false, /* requireUserVerification */
                                extensions);

  MOZ_ASSERT(mTransaction.isNothing());
  mTransaction = Some(U2FTransaction(clientData, Move(AsVariant(callback))));
  mChild->SendRequestSign(mTransaction.ref().mId, info);
}

void U2F::FinishGetAssertion(const uint64_t& aTransactionId,
                             const WebAuthnGetAssertionResult& aResult) {
  MOZ_ASSERT(NS_IsMainThread());

  // Check for a valid transaction.
  if (mTransaction.isNothing() || mTransaction.ref().mId != aTransactionId) {
    return;
  }

  if (NS_WARN_IF(!mTransaction.ref().HasSignCallback())) {
    RejectTransaction(NS_ERROR_ABORT);
    return;
  }

  CryptoBuffer clientDataBuf;
  if (NS_WARN_IF(!clientDataBuf.Assign(mTransaction.ref().mClientData))) {
    RejectTransaction(NS_ERROR_ABORT);
    return;
  }

  CryptoBuffer credBuf;
  if (NS_WARN_IF(!credBuf.Assign(aResult.CredentialID()))) {
    RejectTransaction(NS_ERROR_ABORT);
    return;
  }

  CryptoBuffer sigBuf;
  if (NS_WARN_IF(!sigBuf.Assign(aResult.SigBuffer()))) {
    RejectTransaction(NS_ERROR_ABORT);
    return;
  }

  // Assemble a response object to return
  nsString clientDataBase64;
  nsString signatureDataBase64;
  nsString keyHandleBase64;
  nsresult rvClientData = clientDataBuf.ToJwkBase64(clientDataBase64);
  nsresult rvSignatureData = sigBuf.ToJwkBase64(signatureDataBase64);
  nsresult rvKeyHandle = credBuf.ToJwkBase64(keyHandleBase64);
  if (NS_WARN_IF(NS_FAILED(rvClientData)) ||
      NS_WARN_IF(NS_FAILED(rvSignatureData) ||
                 NS_WARN_IF(NS_FAILED(rvKeyHandle)))) {
    RejectTransaction(NS_ERROR_ABORT);
    return;
  }

  SignResponse response;
  response.mKeyHandle.Construct(keyHandleBase64);
  response.mClientData.Construct(clientDataBase64);
  response.mSignatureData.Construct(signatureDataBase64);
  response.mErrorCode.Construct(static_cast<uint32_t>(ErrorCode::OK));

  // Keep the callback pointer alive.
  nsMainThreadPtrHandle<U2FSignCallback> callback(
      mTransaction.ref().GetSignCallback());

  ClearTransaction();
  ExecuteCallback(response, callback);
}

void U2F::ClearTransaction() {
  if (!NS_WARN_IF(mTransaction.isNothing())) {
    StopListeningForVisibilityEvents();
  }

  mTransaction.reset();
}

void U2F::RejectTransaction(const nsresult& aError) {
  if (NS_WARN_IF(mTransaction.isNothing())) {
    return;
  }

  StopListeningForVisibilityEvents();

  // Clear out mTransaction before calling ExecuteCallback() below to allow
  // reentrancy from microtask checkpoints.
  Maybe<U2FTransaction> maybeTransaction(Move(mTransaction));
  MOZ_ASSERT(mTransaction.isNothing() && maybeTransaction.isSome());

  U2FTransaction& transaction = maybeTransaction.ref();
  ErrorCode code = ConvertNSResultToErrorCode(aError);

  if (transaction.HasRegisterCallback()) {
    RegisterResponse response;
    response.mErrorCode.Construct(static_cast<uint32_t>(code));
    ExecuteCallback(response, transaction.GetRegisterCallback());
  }

  if (transaction.HasSignCallback()) {
    SignResponse response;
    response.mErrorCode.Construct(static_cast<uint32_t>(code));
    ExecuteCallback(response, transaction.GetSignCallback());
  }
}

void U2F::CancelTransaction(const nsresult& aError) {
  if (!NS_WARN_IF(!mChild || mTransaction.isNothing())) {
    mChild->SendRequestCancel(mTransaction.ref().mId);
  }

  RejectTransaction(aError);
}

void U2F::RequestAborted(const uint64_t& aTransactionId,
                         const nsresult& aError) {
  MOZ_ASSERT(NS_IsMainThread());

  if (mTransaction.isSome() && mTransaction.ref().mId == aTransactionId) {
    RejectTransaction(aError);
  }
}

}  // namespace dom
}  // namespace mozilla