summaryrefslogtreecommitdiff
path: root/dom/wifi/WifiCertService.cpp
blob: 85e0d2f5b0d093bc153fd4e4a09eec8df65ff545 (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
/* -*- 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 "WifiCertService.h"

#include "mozilla/ClearOnShutdown.h"
#include "mozilla/EndianUtils.h"
#include "mozilla/ModuleUtils.h"
#include "mozilla/RefPtr.h"
#include "mozilla/dom/File.h"
#include "mozilla/dom/ToJSValue.h"
#include "cert.h"
#include "certdb.h"
#include "CryptoTask.h"
#include "nsIDOMBlob.h"
#include "nsIWifiService.h"
#include "nsNetUtil.h"
#include "nsIInputStream.h"
#include "nsServiceManagerUtils.h"
#include "nsXULAppAPI.h"
#include "ScopedNSSTypes.h"

#define NS_WIFICERTSERVICE_CID \
  { 0x83585afd, 0x0e11, 0x43aa, {0x83, 0x46, 0xf3, 0x4d, 0x97, 0x5e, 0x46, 0x77} }

using namespace mozilla;
using namespace mozilla::dom;

namespace mozilla {

// The singleton Wifi Cert service, to be used on the main thread.
StaticRefPtr<WifiCertService> gWifiCertService;

class ImportCertTask final: public CryptoTask
{
public:
  ImportCertTask(int32_t aId, Blob* aCertBlob,
                 const nsAString& aCertPassword,
                 const nsAString& aCertNickname)
    : mBlob(aCertBlob)
    , mPassword(aCertPassword)
  {
    MOZ_ASSERT(NS_IsMainThread());

    mResult.mId = aId;
    mResult.mStatus = 0;
    mResult.mUsageFlag = 0;
    mResult.mNickname = aCertNickname;
  }

private:
  virtual void ReleaseNSSResources() {}

  virtual nsresult CalculateResult() override
  {
    MOZ_ASSERT(!NS_IsMainThread());

    // read data from blob.
    nsCString blobBuf;
    nsresult rv = ReadBlob(blobBuf);
    if (NS_FAILED(rv)) {
      return rv;
    }

    char* buf;
    uint32_t size = blobBuf.GetMutableData(&buf);
    if (size == 0) {
      return NS_ERROR_OUT_OF_MEMORY;
    }

    // Try import as DER format first.
    rv = ImportDERBlob(buf, size);
    if (NS_SUCCEEDED(rv)) {
      return rv;
    }

    // Try import as PKCS#12 format.
    return ImportPKCS12Blob(buf, size, mPassword);
  }

  virtual void CallCallback(nsresult rv)
  {
    if (NS_FAILED(rv)) {
      mResult.mStatus = -1;
    }
    gWifiCertService->DispatchResult(mResult);
  }

  nsresult ImportDERBlob(char* buf, uint32_t size)
  {
    // Create certificate object.
    ScopedCERTCertificate cert(CERT_DecodeCertFromPackage(buf, size));
    if (!cert) {
      return MapSECStatus(SECFailure);
    }

    // Import certificate.
    return ImportCert(cert);
  }

  static SECItem*
  HandleNicknameCollision(SECItem* aOldNickname, PRBool* aCancel, void* aWincx)
  {
    const char* dummyName = "Imported User Cert";
    const size_t dummyNameLen = strlen(dummyName);
    SECItem* newNick = ::SECITEM_AllocItem(nullptr, nullptr, dummyNameLen + 1);
    if (!newNick) {
      return nullptr;
    }

    newNick->type = siAsciiString;
    // Dummy name, will be renamed later.
    memcpy(newNick->data, dummyName, dummyNameLen + 1);
    newNick->len = dummyNameLen;

    return newNick;
  }

  static SECStatus
  HandleNicknameUpdate(const CERTCertificate *aCert,
                       const SECItem *default_nickname,
                       SECItem **new_nickname,
                       void *arg)
  {
    WifiCertServiceResultOptions *result = (WifiCertServiceResultOptions *)arg;

    nsCString userNickname;
    CopyUTF16toUTF8(result->mNickname, userNickname);

    nsCString fullNickname;
    if (aCert->isRoot && (aCert->nsCertType & NS_CERT_TYPE_SSL_CA)) {
      // Accept self-signed SSL CA as server certificate.
      fullNickname.AssignLiteral("WIFI_SERVERCERT_");
      fullNickname += userNickname;
      result->mUsageFlag |= nsIWifiCertService::WIFI_CERT_USAGE_FLAG_SERVER;
    } else if (aCert->nsCertType & NS_CERT_TYPE_SSL_CLIENT) {
      // User Certificate
      fullNickname.AssignLiteral("WIFI_USERCERT_");
      fullNickname += userNickname;
      result->mUsageFlag |= nsIWifiCertService::WIFI_CERT_USAGE_FLAG_USER;
    }
    char* nickname;
    uint32_t length = fullNickname.GetMutableData(&nickname);

    SECItem* newNick = ::SECITEM_AllocItem(nullptr, nullptr, length + 1);
    if (!newNick) {
      return SECFailure;
    }

    newNick->type = siAsciiString;
    memcpy(newNick->data, nickname, length + 1);
    newNick->len = length;

    *new_nickname = newNick;
    return SECSuccess;
  }

  nsresult ImportPKCS12Blob(char* buf, uint32_t size, const nsAString& aPassword)
  {
    nsString password(aPassword);

    // password is null-terminated wide-char string.
    // passwordItem is required to be big-endian form of password, stored in char
    // array, including the null-termination.
    uint32_t length = password.Length() + 1;
    ScopedSECItem passwordItem(
      ::SECITEM_AllocItem(nullptr, nullptr, length * sizeof(nsString::char_type)));

    if (!passwordItem) {
      return NS_ERROR_FAILURE;
    }

    mozilla::NativeEndian::copyAndSwapToBigEndian(passwordItem->data,
                                                  password.BeginReading(),
                                                  length);
    // Create a decoder.
    ScopedSEC_PKCS12DecoderContext p12dcx(SEC_PKCS12DecoderStart(
                                            passwordItem, nullptr, nullptr,
                                            nullptr, nullptr, nullptr, nullptr,
                                            nullptr));

    if (!p12dcx) {
      return NS_ERROR_FAILURE;
    }

    // Assign data to decorder.
    SECStatus srv = SEC_PKCS12DecoderUpdate(p12dcx,
                                            reinterpret_cast<unsigned char*>(buf),
                                            size);
    if (srv != SECSuccess) {
      return MapSECStatus(srv);
    }

    // Verify certificates.
    srv = SEC_PKCS12DecoderVerify(p12dcx);
    if (srv != SECSuccess) {
      return MapSECStatus(srv);
    }

    // Set certificate nickname and usage flag.
    srv = SEC_PKCS12DecoderRenameCertNicknames(p12dcx, HandleNicknameUpdate,
                                               &mResult);

    // Validate certificates.
    srv = SEC_PKCS12DecoderValidateBags(p12dcx, HandleNicknameCollision);
    if (srv != SECSuccess) {
      return MapSECStatus(srv);
    }

    // Initialize slot.
    ScopedPK11SlotInfo slot(PK11_GetInternalKeySlot());
    if (!slot) {
      return NS_ERROR_FAILURE;
    }
    if (PK11_NeedLogin(slot) && PK11_NeedUserInit(slot)) {
      srv = PK11_InitPin(slot, "", "");
      if (srv != SECSuccess) {
        return MapSECStatus(srv);
      }
    }

    // Import cert and key.
    srv = SEC_PKCS12DecoderImportBags(p12dcx);
    if (srv != SECSuccess) {
      return MapSECStatus(srv);
    }

    // User certificate must be imported from PKCS#12.
    return (mResult.mUsageFlag & nsIWifiCertService::WIFI_CERT_USAGE_FLAG_USER)
            ? NS_OK : NS_ERROR_FAILURE;
  }

  nsresult ReadBlob(/*out*/ nsCString& aBuf)
  {
    NS_ENSURE_ARG_POINTER(mBlob);

    static const uint64_t MAX_FILE_SIZE = 16384;

    ErrorResult rv;
    uint64_t size = mBlob->GetSize(rv);
    if (NS_WARN_IF(rv.Failed())) {
      return rv.StealNSResult();
    }

    if (size > MAX_FILE_SIZE) {
      return NS_ERROR_FILE_TOO_BIG;
    }

    nsCOMPtr<nsIInputStream> inputStream;
    mBlob->GetInternalStream(getter_AddRefs(inputStream), rv);
    if (NS_WARN_IF(rv.Failed())) {
      return rv.StealNSResult();
    }

    rv = NS_ReadInputStreamToString(inputStream, aBuf, (uint32_t)size);
    if (NS_WARN_IF(rv.Failed())) {
      return rv.StealNSResult();
    }

    return NS_OK;
  }

  nsresult ImportCert(CERTCertificate* aCert)
  {
    nsCString userNickname, fullNickname;

    CopyUTF16toUTF8(mResult.mNickname, userNickname);
    // Determine certificate nickname by adding prefix according to its type.
    if (aCert->isRoot && (aCert->nsCertType & NS_CERT_TYPE_SSL_CA)) {
      // Accept self-signed SSL CA as server certificate.
      fullNickname.AssignLiteral("WIFI_SERVERCERT_");
      fullNickname += userNickname;
      mResult.mUsageFlag |= nsIWifiCertService::WIFI_CERT_USAGE_FLAG_SERVER;
    } else if (aCert->nsCertType & NS_CERT_TYPE_SSL_CLIENT) {
      // User Certificate
      fullNickname.AssignLiteral("WIFI_USERCERT_");
      fullNickname += userNickname;
      mResult.mUsageFlag |= nsIWifiCertService::WIFI_CERT_USAGE_FLAG_USER;
    } else {
      return NS_ERROR_ABORT;
    }

    char* nickname;
    uint32_t length;
    length = fullNickname.GetMutableData(&nickname);
    if (length == 0) {
      return NS_ERROR_UNEXPECTED;
    }

    // Import certificate, duplicated nickname will cause error.
    SECStatus srv = CERT_AddTempCertToPerm(aCert, nickname, nullptr);
    if (srv != SECSuccess) {
      return MapSECStatus(srv);
    }

    return NS_OK;
  }

  RefPtr<Blob> mBlob;
  nsString mPassword;
  WifiCertServiceResultOptions mResult;
};

class DeleteCertTask final: public CryptoTask
{
public:
  DeleteCertTask(int32_t aId, const nsAString& aCertNickname)
  {
    MOZ_ASSERT(NS_IsMainThread());

    mResult.mId = aId;
    mResult.mStatus = 0;
    mResult.mUsageFlag = 0;
    mResult.mNickname = aCertNickname;
  }

private:
  virtual void ReleaseNSSResources() {}

  virtual nsresult CalculateResult() override
  {
    MOZ_ASSERT(!NS_IsMainThread());

    nsCString userNickname;
    CopyUTF16toUTF8(mResult.mNickname, userNickname);

    // Delete server certificate.
    nsCString serverCertName("WIFI_SERVERCERT_", 16);
    serverCertName += userNickname;
    nsresult rv = deleteCert(serverCertName);
    if (NS_FAILED(rv)) {
      return rv;
    }

    // Delete user certificate and private key.
    nsCString userCertName("WIFI_USERCERT_", 14);
    userCertName += userNickname;
    rv = deleteCert(userCertName);
    if (NS_FAILED(rv)) {
      return rv;
    }

    return NS_OK;
  }

  nsresult deleteCert(const nsCString &aCertNickname)
  {
    ScopedCERTCertificate cert(
      CERT_FindCertByNickname(CERT_GetDefaultCertDB(), aCertNickname.get())
    );
    // Because we delete certificates in blind, so it's acceptable to delete
    // a non-exist certificate.
    if (!cert) {
      return NS_OK;
    }

    ScopedPK11SlotInfo slot(
      PK11_KeyForCertExists(cert, nullptr, nullptr)
    );

    SECStatus srv;
    if (slot) {
      // Delete private key along with certificate.
      srv = PK11_DeleteTokenCertAndKey(cert, nullptr);
    } else {
      srv = SEC_DeletePermCertificate(cert);
    }

    if (srv != SECSuccess) {
      return MapSECStatus(srv);
    }

    return NS_OK;
  }

  virtual void CallCallback(nsresult rv)
  {
    if (NS_FAILED(rv)) {
      mResult.mStatus = -1;
    }
    gWifiCertService->DispatchResult(mResult);
  }

  WifiCertServiceResultOptions mResult;
};

NS_IMPL_ISUPPORTS(WifiCertService, nsIWifiCertService)

NS_IMETHODIMP
WifiCertService::Start(nsIWifiEventListener* aListener)
{
  MOZ_ASSERT(aListener);

  mListener = aListener;

  return NS_OK;
}

NS_IMETHODIMP
WifiCertService::Shutdown()
{
  MOZ_ASSERT(NS_IsMainThread());

  mListener = nullptr;

  return NS_OK;
}

void
WifiCertService::DispatchResult(const WifiCertServiceResultOptions& aOptions)
{
  MOZ_ASSERT(NS_IsMainThread());

  mozilla::AutoSafeJSContext cx;
  JS::RootedValue val(cx);
  nsCString dummyInterface;

  if (!ToJSValue(cx, aOptions, &val)) {
    return;
  }

  // Certll the listener with a JS value.
  mListener->OnCommand(val, dummyInterface);
}

WifiCertService::WifiCertService()
{
  MOZ_ASSERT(NS_IsMainThread());
  MOZ_ASSERT(!gWifiCertService);
}

WifiCertService::~WifiCertService()
{
  MOZ_ASSERT(!gWifiCertService);

  nsNSSShutDownPreventionLock locker;
  if (isAlreadyShutDown()) {
    return;
  }
  shutdown(ShutdownCalledFrom::Object);
}

already_AddRefed<WifiCertService>
WifiCertService::FactoryCreate()
{
  if (!XRE_IsParentProcess()) {
    return nullptr;
  }

  MOZ_ASSERT(NS_IsMainThread());

  if (!gWifiCertService) {
    gWifiCertService = new WifiCertService();
    ClearOnShutdown(&gWifiCertService);
  }

  RefPtr<WifiCertService> service = gWifiCertService.get();
  return service.forget();
}

NS_IMETHODIMP
WifiCertService::ImportCert(int32_t aId, nsIDOMBlob* aCertBlob,
                            const nsAString& aCertPassword,
                            const nsAString& aCertNickname)
{
  RefPtr<Blob> blob = static_cast<Blob*>(aCertBlob);
  RefPtr<CryptoTask> task = new ImportCertTask(aId, blob, aCertPassword,
                                               aCertNickname);
  return task->Dispatch("WifiImportCert");
}

NS_IMETHODIMP
WifiCertService::DeleteCert(int32_t aId, const nsAString& aCertNickname)
{
  RefPtr<CryptoTask> task = new DeleteCertTask(aId, aCertNickname);
  return task->Dispatch("WifiDeleteCert");
}

NS_IMETHODIMP
WifiCertService::HasPrivateKey(const nsAString& aCertNickname, bool *aHasKey)
{
  *aHasKey = false;

  nsNSSShutDownPreventionLock locker;
  if (isAlreadyShutDown()) {
    return NS_ERROR_NOT_AVAILABLE;
  }

  nsCString certNickname;
  CopyUTF16toUTF8(aCertNickname, certNickname);

  ScopedCERTCertificate cert(
    CERT_FindCertByNickname(CERT_GetDefaultCertDB(), certNickname.get())
  );
  if (!cert) {
    return NS_OK;
  }

  ScopedPK11SlotInfo slot(
    PK11_KeyForCertExists(cert, nullptr, nullptr)
  );
  if (slot) {
    *aHasKey = true;
  }

  return NS_OK;
}

NS_GENERIC_FACTORY_SINGLETON_CONSTRUCTOR(WifiCertService,
                                         WifiCertService::FactoryCreate)

NS_DEFINE_NAMED_CID(NS_WIFICERTSERVICE_CID);

static const mozilla::Module::CIDEntry kWifiCertServiceCIDs[] = {
  { &kNS_WIFICERTSERVICE_CID, false, nullptr, WifiCertServiceConstructor },
  { nullptr }
};

static const mozilla::Module::ContractIDEntry kWifiCertServiceContracts[] = {
  { "@mozilla.org/wifi/certservice;1", &kNS_WIFICERTSERVICE_CID },
  { nullptr }
};

static const mozilla::Module kWifiCertServiceModule = {
  mozilla::Module::kVersion,
  kWifiCertServiceCIDs,
  kWifiCertServiceContracts,
  nullptr
};

} // namespace mozilla

NSMODULE_DEFN(WifiCertServiceModule) = &kWifiCertServiceModule;