forked from Pissandshittium/pissandshittium
-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathnss_util.cc
1149 lines (989 loc) · 38 KB
/
nss_util.cc
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
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
// Copyright (c) 2012 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.
#include "crypto/nss_util.h"
#include "crypto/nss_util_internal.h"
#include <nss.h>
#include <pk11pub.h>
#include <plarena.h>
#include <prerror.h>
#include <prinit.h>
#include <prtime.h>
#include <secmod.h>
#if defined(OS_OPENBSD)
#include <sys/mount.h>
#include <sys/param.h>
#endif
#if defined(OS_CHROMEOS)
#include <dlfcn.h>
#endif
#include <map>
#include <vector>
#include "base/base_paths.h"
#include "base/bind.h"
#include "base/cpu.h"
#include "base/debug/alias.h"
#include "base/debug/stack_trace.h"
#include "base/environment.h"
#include "base/files/file_path.h"
#include "base/files/file_util.h"
#include "base/lazy_instance.h"
#include "base/logging.h"
#include "base/memory/scoped_ptr.h"
#include "base/message_loop/message_loop.h"
#include "base/native_library.h"
#include "base/path_service.h"
#include "base/stl_util.h"
#include "base/strings/stringprintf.h"
#include "base/threading/thread_checker.h"
#include "base/threading/thread_restrictions.h"
#include "base/threading/worker_pool.h"
#include "build/build_config.h"
// USE_NSS_CERTS means NSS is used for certificates and platform integration.
// This requires additional support to manage the platform certificate and key
// stores.
#if defined(USE_NSS_CERTS)
#include "base/synchronization/lock.h"
#include "crypto/nss_crypto_module_delegate.h"
#endif // defined(USE_NSS_CERTS)
namespace crypto {
namespace {
#if defined(OS_CHROMEOS)
const char kUserNSSDatabaseName[] = "UserNSSDB";
// Constants for loading the Chrome OS TPM-backed PKCS #11 library.
const char kChapsModuleName[] = "Chaps";
const char kChapsPath[] = "libchaps.so";
// Fake certificate authority database used for testing.
static const base::FilePath::CharType kReadOnlyCertDB[] =
FILE_PATH_LITERAL("/etc/fake_root_ca/nssdb");
#endif // defined(OS_CHROMEOS)
std::string GetNSSErrorMessage() {
std::string result;
if (PR_GetErrorTextLength()) {
scoped_ptr<char[]> error_text(new char[PR_GetErrorTextLength() + 1]);
PRInt32 copied = PR_GetErrorText(error_text.get());
result = std::string(error_text.get(), copied);
} else {
result = base::StringPrintf("NSS error code: %d", PR_GetError());
}
return result;
}
#if defined(USE_NSS_CERTS)
#if !defined(OS_CHROMEOS)
base::FilePath GetDefaultConfigDirectory() {
base::FilePath dir;
PathService::Get(base::DIR_HOME, &dir);
if (dir.empty()) {
LOG(ERROR) << "Failed to get home directory.";
return dir;
}
dir = dir.AppendASCII(".pki").AppendASCII("nssdb");
if (!base::CreateDirectory(dir)) {
LOG(ERROR) << "Failed to create " << dir.value() << " directory.";
dir.clear();
}
DVLOG(2) << "DefaultConfigDirectory: " << dir.value();
return dir;
}
#endif // !defined(IS_CHROMEOS)
// On non-Chrome OS platforms, return the default config directory. On Chrome OS
// test images, return a read-only directory with fake root CA certs (which are
// used by the local Google Accounts server mock we use when testing our login
// code). On Chrome OS non-test images (where the read-only directory doesn't
// exist), return an empty path.
base::FilePath GetInitialConfigDirectory() {
#if defined(OS_CHROMEOS)
base::FilePath database_dir = base::FilePath(kReadOnlyCertDB);
if (!base::PathExists(database_dir))
database_dir.clear();
return database_dir;
#else
return GetDefaultConfigDirectory();
#endif // defined(OS_CHROMEOS)
}
// This callback for NSS forwards all requests to a caller-specified
// CryptoModuleBlockingPasswordDelegate object.
char* PKCS11PasswordFunc(PK11SlotInfo* slot, PRBool retry, void* arg) {
crypto::CryptoModuleBlockingPasswordDelegate* delegate =
reinterpret_cast<crypto::CryptoModuleBlockingPasswordDelegate*>(arg);
if (delegate) {
bool cancelled = false;
std::string password = delegate->RequestPassword(PK11_GetTokenName(slot),
retry != PR_FALSE,
&cancelled);
if (cancelled)
return NULL;
char* result = PORT_Strdup(password.c_str());
password.replace(0, password.size(), password.size(), 0);
return result;
}
DLOG(ERROR) << "PK11 password requested with NULL arg";
return NULL;
}
// NSS creates a local cache of the sqlite database if it detects that the
// filesystem the database is on is much slower than the local disk. The
// detection doesn't work with the latest versions of sqlite, such as 3.6.22
// (NSS bug https://bugzilla.mozilla.org/show_bug.cgi?id=578561). So we set
// the NSS environment variable NSS_SDB_USE_CACHE to "yes" to override NSS's
// detection when database_dir is on NFS. See http://crbug.com/48585.
//
// TODO(wtc): port this function to other USE_NSS_CERTS platforms. It is
// defined only for OS_LINUX and OS_OPENBSD simply because the statfs structure
// is OS-specific.
//
// Because this function sets an environment variable it must be run before we
// go multi-threaded.
void UseLocalCacheOfNSSDatabaseIfNFS(const base::FilePath& database_dir) {
bool db_on_nfs = false;
#if defined(OS_LINUX)
base::FileSystemType fs_type = base::FILE_SYSTEM_UNKNOWN;
if (base::GetFileSystemType(database_dir, &fs_type))
db_on_nfs = (fs_type == base::FILE_SYSTEM_NFS);
#elif defined(OS_OPENBSD)
struct statfs buf;
if (statfs(database_dir.value().c_str(), &buf) == 0)
db_on_nfs = (strcmp(buf.f_fstypename, MOUNT_NFS) == 0);
#else
NOTIMPLEMENTED();
#endif
if (db_on_nfs) {
scoped_ptr<base::Environment> env(base::Environment::Create());
static const char kUseCacheEnvVar[] = "NSS_SDB_USE_CACHE";
if (!env->HasVar(kUseCacheEnvVar))
env->SetVar(kUseCacheEnvVar, "yes");
}
}
#endif // defined(USE_NSS_CERTS)
// A singleton to initialize/deinitialize NSPR.
// Separate from the NSS singleton because we initialize NSPR on the UI thread.
// Now that we're leaking the singleton, we could merge back with the NSS
// singleton.
class NSPRInitSingleton {
private:
friend struct base::DefaultLazyInstanceTraits<NSPRInitSingleton>;
NSPRInitSingleton() {
PR_Init(PR_USER_THREAD, PR_PRIORITY_NORMAL, 0);
}
// NOTE(willchan): We don't actually execute this code since we leak NSS to
// prevent non-joinable threads from using NSS after it's already been shut
// down.
~NSPRInitSingleton() {
PL_ArenaFinish();
PRStatus prstatus = PR_Cleanup();
if (prstatus != PR_SUCCESS)
LOG(ERROR) << "PR_Cleanup failed; was NSPR initialized on wrong thread?";
}
};
base::LazyInstance<NSPRInitSingleton>::Leaky
g_nspr_singleton = LAZY_INSTANCE_INITIALIZER;
// Force a crash with error info on NSS_NoDB_Init failure.
void CrashOnNSSInitFailure() {
int nss_error = PR_GetError();
int os_error = PR_GetOSError();
base::debug::Alias(&nss_error);
base::debug::Alias(&os_error);
LOG(ERROR) << "Error initializing NSS without a persistent database: "
<< GetNSSErrorMessage();
LOG(FATAL) << "nss_error=" << nss_error << ", os_error=" << os_error;
}
#if defined(OS_CHROMEOS)
class ChromeOSUserData {
public:
explicit ChromeOSUserData(ScopedPK11Slot public_slot)
: public_slot_(public_slot.Pass()),
private_slot_initialization_started_(false) {}
~ChromeOSUserData() {
if (public_slot_) {
SECStatus status = SECMOD_CloseUserDB(public_slot_.get());
if (status != SECSuccess)
PLOG(ERROR) << "SECMOD_CloseUserDB failed: " << PORT_GetError();
}
}
ScopedPK11Slot GetPublicSlot() {
return ScopedPK11Slot(
public_slot_ ? PK11_ReferenceSlot(public_slot_.get()) : NULL);
}
ScopedPK11Slot GetPrivateSlot(
const base::Callback<void(ScopedPK11Slot)>& callback) {
if (private_slot_)
return ScopedPK11Slot(PK11_ReferenceSlot(private_slot_.get()));
if (!callback.is_null())
tpm_ready_callback_list_.push_back(callback);
return ScopedPK11Slot();
}
void SetPrivateSlot(ScopedPK11Slot private_slot) {
DCHECK(!private_slot_);
private_slot_ = private_slot.Pass();
SlotReadyCallbackList callback_list;
callback_list.swap(tpm_ready_callback_list_);
for (SlotReadyCallbackList::iterator i = callback_list.begin();
i != callback_list.end();
++i) {
(*i).Run(ScopedPK11Slot(PK11_ReferenceSlot(private_slot_.get())));
}
}
bool private_slot_initialization_started() const {
return private_slot_initialization_started_;
}
void set_private_slot_initialization_started() {
private_slot_initialization_started_ = true;
}
private:
ScopedPK11Slot public_slot_;
ScopedPK11Slot private_slot_;
bool private_slot_initialization_started_;
typedef std::vector<base::Callback<void(ScopedPK11Slot)> >
SlotReadyCallbackList;
SlotReadyCallbackList tpm_ready_callback_list_;
};
class ScopedChapsLoadFixup {
public:
ScopedChapsLoadFixup();
~ScopedChapsLoadFixup();
private:
#if defined(COMPONENT_BUILD)
void *chaps_handle_;
#endif
};
#if defined(COMPONENT_BUILD)
ScopedChapsLoadFixup::ScopedChapsLoadFixup() {
// HACK: libchaps links the system protobuf and there are symbol conflicts
// with the bundled copy. Load chaps with RTLD_DEEPBIND to workaround.
chaps_handle_ = dlopen(kChapsPath, RTLD_LOCAL | RTLD_NOW | RTLD_DEEPBIND);
}
ScopedChapsLoadFixup::~ScopedChapsLoadFixup() {
// LoadModule() will have taken a 2nd reference.
if (chaps_handle_)
dlclose(chaps_handle_);
}
#else
ScopedChapsLoadFixup::ScopedChapsLoadFixup() {}
ScopedChapsLoadFixup::~ScopedChapsLoadFixup() {}
#endif // defined(COMPONENT_BUILD)
#endif // defined(OS_CHROMEOS)
class NSSInitSingleton {
public:
#if defined(OS_CHROMEOS)
// Used with PostTaskAndReply to pass handles to worker thread and back.
struct TPMModuleAndSlot {
explicit TPMModuleAndSlot(SECMODModule* init_chaps_module)
: chaps_module(init_chaps_module) {}
SECMODModule* chaps_module;
crypto::ScopedPK11Slot tpm_slot;
};
ScopedPK11Slot OpenPersistentNSSDBForPath(const std::string& db_name,
const base::FilePath& path) {
DCHECK(thread_checker_.CalledOnValidThread());
// NSS is allowed to do IO on the current thread since dispatching
// to a dedicated thread would still have the affect of blocking
// the current thread, due to NSS's internal locking requirements
base::ThreadRestrictions::ScopedAllowIO allow_io;
base::FilePath nssdb_path = path.AppendASCII(".pki").AppendASCII("nssdb");
if (!base::CreateDirectory(nssdb_path)) {
LOG(ERROR) << "Failed to create " << nssdb_path.value() << " directory.";
return ScopedPK11Slot();
}
return OpenSoftwareNSSDB(nssdb_path, db_name);
}
void EnableTPMTokenForNSS() {
DCHECK(thread_checker_.CalledOnValidThread());
// If this gets set, then we'll use the TPM for certs with
// private keys, otherwise we'll fall back to the software
// implementation.
tpm_token_enabled_for_nss_ = true;
}
bool IsTPMTokenEnabledForNSS() {
DCHECK(thread_checker_.CalledOnValidThread());
return tpm_token_enabled_for_nss_;
}
void InitializeTPMTokenAndSystemSlot(
int system_slot_id,
const base::Callback<void(bool)>& callback) {
DCHECK(thread_checker_.CalledOnValidThread());
// Should not be called while there is already an initialization in
// progress.
DCHECK(!initializing_tpm_token_);
// If EnableTPMTokenForNSS hasn't been called, return false.
if (!tpm_token_enabled_for_nss_) {
base::MessageLoop::current()->PostTask(FROM_HERE,
base::Bind(callback, false));
return;
}
// If everything is already initialized, then return true.
// Note that only |tpm_slot_| is checked, since |chaps_module_| could be
// NULL in tests while |tpm_slot_| has been set to the test DB.
if (tpm_slot_) {
base::MessageLoop::current()->PostTask(FROM_HERE,
base::Bind(callback, true));
return;
}
// Note that a reference is not taken to chaps_module_. This is safe since
// NSSInitSingleton is Leaky, so the reference it holds is never released.
scoped_ptr<TPMModuleAndSlot> tpm_args(new TPMModuleAndSlot(chaps_module_));
TPMModuleAndSlot* tpm_args_ptr = tpm_args.get();
if (base::WorkerPool::PostTaskAndReply(
FROM_HERE,
base::Bind(&NSSInitSingleton::InitializeTPMTokenOnWorkerThread,
system_slot_id,
tpm_args_ptr),
base::Bind(&NSSInitSingleton::OnInitializedTPMTokenAndSystemSlot,
base::Unretained(this), // NSSInitSingleton is leaky
callback,
base::Passed(&tpm_args)),
true /* task_is_slow */
)) {
initializing_tpm_token_ = true;
} else {
base::MessageLoop::current()->PostTask(FROM_HERE,
base::Bind(callback, false));
}
}
static void InitializeTPMTokenOnWorkerThread(CK_SLOT_ID token_slot_id,
TPMModuleAndSlot* tpm_args) {
// This tries to load the Chaps module so NSS can talk to the hardware
// TPM.
if (!tpm_args->chaps_module) {
ScopedChapsLoadFixup chaps_loader;
DVLOG(3) << "Loading chaps...";
tpm_args->chaps_module = LoadModule(
kChapsModuleName,
kChapsPath,
// For more details on these parameters, see:
// https://developer.mozilla.org/en/PKCS11_Module_Specs
// slotFlags=[PublicCerts] -- Certificates and public keys can be
// read from this slot without requiring a call to C_Login.
// askpw=only -- Only authenticate to the token when necessary.
"NSS=\"slotParams=(0={slotFlags=[PublicCerts] askpw=only})\"");
}
if (tpm_args->chaps_module) {
tpm_args->tpm_slot =
GetTPMSlotForIdOnWorkerThread(tpm_args->chaps_module, token_slot_id);
}
}
void OnInitializedTPMTokenAndSystemSlot(
const base::Callback<void(bool)>& callback,
scoped_ptr<TPMModuleAndSlot> tpm_args) {
DCHECK(thread_checker_.CalledOnValidThread());
DVLOG(2) << "Loaded chaps: " << !!tpm_args->chaps_module
<< ", got tpm slot: " << !!tpm_args->tpm_slot;
chaps_module_ = tpm_args->chaps_module;
tpm_slot_ = tpm_args->tpm_slot.Pass();
if (!chaps_module_ && test_system_slot_) {
// chromeos_unittests try to test the TPM initialization process. If we
// have a test DB open, pretend that it is the TPM slot.
tpm_slot_.reset(PK11_ReferenceSlot(test_system_slot_.get()));
}
initializing_tpm_token_ = false;
if (tpm_slot_)
RunAndClearTPMReadyCallbackList();
callback.Run(!!tpm_slot_);
}
void RunAndClearTPMReadyCallbackList() {
TPMReadyCallbackList callback_list;
callback_list.swap(tpm_ready_callback_list_);
for (TPMReadyCallbackList::iterator i = callback_list.begin();
i != callback_list.end();
++i) {
i->Run();
}
}
bool IsTPMTokenReady(const base::Closure& callback) {
if (!callback.is_null()) {
// Cannot DCHECK in the general case yet, but since the callback is
// a new addition to the API, DCHECK to make sure at least the new uses
// don't regress.
DCHECK(thread_checker_.CalledOnValidThread());
} else if (!thread_checker_.CalledOnValidThread()) {
// TODO(mattm): Change to DCHECK when callers have been fixed.
DVLOG(1) << "Called on wrong thread.\n"
<< base::debug::StackTrace().ToString();
}
if (tpm_slot_)
return true;
if (!callback.is_null())
tpm_ready_callback_list_.push_back(callback);
return false;
}
// Note that CK_SLOT_ID is an unsigned long, but cryptohome gives us the slot
// id as an int. This should be safe since this is only used with chaps, which
// we also control.
static crypto::ScopedPK11Slot GetTPMSlotForIdOnWorkerThread(
SECMODModule* chaps_module,
CK_SLOT_ID slot_id) {
DCHECK(chaps_module);
DVLOG(3) << "Poking chaps module.";
SECStatus rv = SECMOD_UpdateSlotList(chaps_module);
if (rv != SECSuccess)
PLOG(ERROR) << "SECMOD_UpdateSlotList failed: " << PORT_GetError();
PK11SlotInfo* slot = SECMOD_LookupSlot(chaps_module->moduleID, slot_id);
if (!slot)
LOG(ERROR) << "TPM slot " << slot_id << " not found.";
return crypto::ScopedPK11Slot(slot);
}
bool InitializeNSSForChromeOSUser(const std::string& username_hash,
const base::FilePath& path) {
DCHECK(thread_checker_.CalledOnValidThread());
if (chromeos_user_map_.find(username_hash) != chromeos_user_map_.end()) {
// This user already exists in our mapping.
DVLOG(2) << username_hash << " already initialized.";
return false;
}
DVLOG(2) << "Opening NSS DB " << path.value();
std::string db_name = base::StringPrintf(
"%s %s", kUserNSSDatabaseName, username_hash.c_str());
ScopedPK11Slot public_slot(OpenPersistentNSSDBForPath(db_name, path));
chromeos_user_map_[username_hash] =
new ChromeOSUserData(public_slot.Pass());
return true;
}
bool ShouldInitializeTPMForChromeOSUser(const std::string& username_hash) {
DCHECK(thread_checker_.CalledOnValidThread());
DCHECK(chromeos_user_map_.find(username_hash) != chromeos_user_map_.end());
return !chromeos_user_map_[username_hash]
->private_slot_initialization_started();
}
void WillInitializeTPMForChromeOSUser(const std::string& username_hash) {
DCHECK(thread_checker_.CalledOnValidThread());
DCHECK(chromeos_user_map_.find(username_hash) != chromeos_user_map_.end());
chromeos_user_map_[username_hash]
->set_private_slot_initialization_started();
}
void InitializeTPMForChromeOSUser(const std::string& username_hash,
CK_SLOT_ID slot_id) {
DCHECK(thread_checker_.CalledOnValidThread());
DCHECK(chromeos_user_map_.find(username_hash) != chromeos_user_map_.end());
DCHECK(chromeos_user_map_[username_hash]->
private_slot_initialization_started());
if (!chaps_module_)
return;
// Note that a reference is not taken to chaps_module_. This is safe since
// NSSInitSingleton is Leaky, so the reference it holds is never released.
scoped_ptr<TPMModuleAndSlot> tpm_args(new TPMModuleAndSlot(chaps_module_));
TPMModuleAndSlot* tpm_args_ptr = tpm_args.get();
base::WorkerPool::PostTaskAndReply(
FROM_HERE,
base::Bind(&NSSInitSingleton::InitializeTPMTokenOnWorkerThread,
slot_id,
tpm_args_ptr),
base::Bind(&NSSInitSingleton::OnInitializedTPMForChromeOSUser,
base::Unretained(this), // NSSInitSingleton is leaky
username_hash,
base::Passed(&tpm_args)),
true /* task_is_slow */
);
}
void OnInitializedTPMForChromeOSUser(const std::string& username_hash,
scoped_ptr<TPMModuleAndSlot> tpm_args) {
DCHECK(thread_checker_.CalledOnValidThread());
DVLOG(2) << "Got tpm slot for " << username_hash << " "
<< !!tpm_args->tpm_slot;
chromeos_user_map_[username_hash]->SetPrivateSlot(
tpm_args->tpm_slot.Pass());
}
void InitializePrivateSoftwareSlotForChromeOSUser(
const std::string& username_hash) {
DCHECK(thread_checker_.CalledOnValidThread());
VLOG(1) << "using software private slot for " << username_hash;
DCHECK(chromeos_user_map_.find(username_hash) != chromeos_user_map_.end());
DCHECK(chromeos_user_map_[username_hash]->
private_slot_initialization_started());
chromeos_user_map_[username_hash]->SetPrivateSlot(
chromeos_user_map_[username_hash]->GetPublicSlot());
}
ScopedPK11Slot GetPublicSlotForChromeOSUser(
const std::string& username_hash) {
DCHECK(thread_checker_.CalledOnValidThread());
if (username_hash.empty()) {
DVLOG(2) << "empty username_hash";
return ScopedPK11Slot();
}
if (chromeos_user_map_.find(username_hash) == chromeos_user_map_.end()) {
LOG(ERROR) << username_hash << " not initialized.";
return ScopedPK11Slot();
}
return chromeos_user_map_[username_hash]->GetPublicSlot();
}
ScopedPK11Slot GetPrivateSlotForChromeOSUser(
const std::string& username_hash,
const base::Callback<void(ScopedPK11Slot)>& callback) {
DCHECK(thread_checker_.CalledOnValidThread());
if (username_hash.empty()) {
DVLOG(2) << "empty username_hash";
if (!callback.is_null()) {
base::MessageLoop::current()->PostTask(
FROM_HERE, base::Bind(callback, base::Passed(ScopedPK11Slot())));
}
return ScopedPK11Slot();
}
DCHECK(chromeos_user_map_.find(username_hash) != chromeos_user_map_.end());
return chromeos_user_map_[username_hash]->GetPrivateSlot(callback);
}
void CloseChromeOSUserForTesting(const std::string& username_hash) {
DCHECK(thread_checker_.CalledOnValidThread());
ChromeOSUserMap::iterator i = chromeos_user_map_.find(username_hash);
DCHECK(i != chromeos_user_map_.end());
delete i->second;
chromeos_user_map_.erase(i);
}
void SetSystemKeySlotForTesting(ScopedPK11Slot slot) {
// Ensure that a previous value of test_system_slot_ is not overwritten.
// Unsetting, i.e. setting a NULL, however is allowed.
DCHECK(!slot || !test_system_slot_);
test_system_slot_ = slot.Pass();
if (test_system_slot_) {
tpm_slot_.reset(PK11_ReferenceSlot(test_system_slot_.get()));
RunAndClearTPMReadyCallbackList();
} else {
tpm_slot_.reset();
}
}
#endif // defined(OS_CHROMEOS)
#if !defined(OS_CHROMEOS)
PK11SlotInfo* GetPersistentNSSKeySlot() {
// TODO(mattm): Change to DCHECK when callers have been fixed.
if (!thread_checker_.CalledOnValidThread()) {
DVLOG(1) << "Called on wrong thread.\n"
<< base::debug::StackTrace().ToString();
}
return PK11_GetInternalKeySlot();
}
#endif
#if defined(OS_CHROMEOS)
void GetSystemNSSKeySlotCallback(
const base::Callback<void(ScopedPK11Slot)>& callback) {
callback.Run(ScopedPK11Slot(PK11_ReferenceSlot(tpm_slot_.get())));
}
ScopedPK11Slot GetSystemNSSKeySlot(
const base::Callback<void(ScopedPK11Slot)>& callback) {
DCHECK(thread_checker_.CalledOnValidThread());
// TODO(mattm): chromeos::TPMTokenloader always calls
// InitializeTPMTokenAndSystemSlot with slot 0. If the system slot is
// disabled, tpm_slot_ will be the first user's slot instead. Can that be
// detected and return NULL instead?
base::Closure wrapped_callback;
if (!callback.is_null()) {
wrapped_callback =
base::Bind(&NSSInitSingleton::GetSystemNSSKeySlotCallback,
base::Unretained(this) /* singleton is leaky */,
callback);
}
if (IsTPMTokenReady(wrapped_callback))
return ScopedPK11Slot(PK11_ReferenceSlot(tpm_slot_.get()));
return ScopedPK11Slot();
}
#endif
#if defined(USE_NSS_CERTS)
base::Lock* write_lock() {
return &write_lock_;
}
#endif // defined(USE_NSS_CERTS)
#if !defined(USE_OPENSSL)
// This method is used to force NSS to be initialized without a DB.
// Call this method before NSSInitSingleton() is constructed.
static void ForceNoDBInit() {
force_nodb_init_ = true;
}
#endif
private:
friend struct base::DefaultLazyInstanceTraits<NSSInitSingleton>;
NSSInitSingleton()
: tpm_token_enabled_for_nss_(false),
initializing_tpm_token_(false),
chaps_module_(NULL),
root_(NULL) {
// It's safe to construct on any thread, since LazyInstance will prevent any
// other threads from accessing until the constructor is done.
thread_checker_.DetachFromThread();
DisableAESNIIfNeeded();
EnsureNSPRInit();
// We *must* have NSS >= 3.14.3.
static_assert(
(NSS_VMAJOR == 3 && NSS_VMINOR == 14 && NSS_VPATCH >= 3) ||
(NSS_VMAJOR == 3 && NSS_VMINOR > 14) ||
(NSS_VMAJOR > 3),
"nss version check failed");
// Also check the run-time NSS version.
// NSS_VersionCheck is a >= check, not strict equality.
if (!NSS_VersionCheck("3.14.3")) {
LOG(FATAL) << "NSS_VersionCheck(\"3.14.3\") failed. NSS >= 3.14.3 is "
"required. Please upgrade to the latest NSS, and if you "
"still get this error, contact your distribution "
"maintainer.";
}
SECStatus status = SECFailure;
bool nodb_init = false;
#if !defined(USE_OPENSSL)
// ForceNoDBInit was called.
if (force_nodb_init_)
nodb_init = true;
#endif
#if !defined(USE_NSS_CERTS)
// Use the system certificate store, so initialize NSS without database.
nodb_init = true;
#endif
if (nodb_init) {
status = NSS_NoDB_Init(NULL);
if (status != SECSuccess) {
CrashOnNSSInitFailure();
return;
}
#if defined(OS_IOS)
root_ = InitDefaultRootCerts();
#endif // defined(OS_IOS)
} else {
#if defined(USE_NSS_CERTS)
base::FilePath database_dir = GetInitialConfigDirectory();
if (!database_dir.empty()) {
// This duplicates the work which should have been done in
// EarlySetupForNSSInit. However, this function is idempotent so
// there's no harm done.
UseLocalCacheOfNSSDatabaseIfNFS(database_dir);
// Initialize with a persistent database (likely, ~/.pki/nssdb).
// Use "sql:" which can be shared by multiple processes safely.
std::string nss_config_dir =
base::StringPrintf("sql:%s", database_dir.value().c_str());
#if defined(OS_CHROMEOS)
status = NSS_Init(nss_config_dir.c_str());
#else
status = NSS_InitReadWrite(nss_config_dir.c_str());
#endif
if (status != SECSuccess) {
LOG(ERROR) << "Error initializing NSS with a persistent "
"database (" << nss_config_dir
<< "): " << GetNSSErrorMessage();
}
}
if (status != SECSuccess) {
VLOG(1) << "Initializing NSS without a persistent database.";
status = NSS_NoDB_Init(NULL);
if (status != SECSuccess) {
CrashOnNSSInitFailure();
return;
}
}
PK11_SetPasswordFunc(PKCS11PasswordFunc);
// If we haven't initialized the password for the NSS databases,
// initialize an empty-string password so that we don't need to
// log in.
PK11SlotInfo* slot = PK11_GetInternalKeySlot();
if (slot) {
// PK11_InitPin may write to the keyDB, but no other thread can use NSS
// yet, so we don't need to lock.
if (PK11_NeedUserInit(slot))
PK11_InitPin(slot, NULL, NULL);
PK11_FreeSlot(slot);
}
root_ = InitDefaultRootCerts();
#endif // defined(USE_NSS_CERTS)
}
// Disable MD5 certificate signatures. (They are disabled by default in
// NSS 3.14.)
NSS_SetAlgorithmPolicy(SEC_OID_MD5, 0, NSS_USE_ALG_IN_CERT_SIGNATURE);
NSS_SetAlgorithmPolicy(SEC_OID_PKCS1_MD5_WITH_RSA_ENCRYPTION,
0, NSS_USE_ALG_IN_CERT_SIGNATURE);
}
// NOTE(willchan): We don't actually execute this code since we leak NSS to
// prevent non-joinable threads from using NSS after it's already been shut
// down.
~NSSInitSingleton() {
#if defined(OS_CHROMEOS)
STLDeleteValues(&chromeos_user_map_);
#endif
tpm_slot_.reset();
if (root_) {
SECMOD_UnloadUserModule(root_);
SECMOD_DestroyModule(root_);
root_ = NULL;
}
if (chaps_module_) {
SECMOD_UnloadUserModule(chaps_module_);
SECMOD_DestroyModule(chaps_module_);
chaps_module_ = NULL;
}
SECStatus status = NSS_Shutdown();
if (status != SECSuccess) {
// We VLOG(1) because this failure is relatively harmless (leaking, but
// we're shutting down anyway).
VLOG(1) << "NSS_Shutdown failed; see http://crbug.com/4609";
}
}
#if defined(USE_NSS_CERTS) || defined(OS_IOS)
// Load nss's built-in root certs.
SECMODModule* InitDefaultRootCerts() {
SECMODModule* root = LoadModule("Root Certs", "libnssckbi.so", NULL);
if (root)
return root;
// Aw, snap. Can't find/load root cert shared library.
// This will make it hard to talk to anybody via https.
// TODO(mattm): Re-add the NOTREACHED here when crbug.com/310972 is fixed.
return NULL;
}
// Load the given module for this NSS session.
static SECMODModule* LoadModule(const char* name,
const char* library_path,
const char* params) {
std::string modparams = base::StringPrintf(
"name=\"%s\" library=\"%s\" %s",
name, library_path, params ? params : "");
// Shouldn't need to const_cast here, but SECMOD doesn't properly
// declare input string arguments as const. Bug
// https://bugzilla.mozilla.org/show_bug.cgi?id=642546 was filed
// on NSS codebase to address this.
SECMODModule* module = SECMOD_LoadUserModule(
const_cast<char*>(modparams.c_str()), NULL, PR_FALSE);
if (!module) {
LOG(ERROR) << "Error loading " << name << " module into NSS: "
<< GetNSSErrorMessage();
return NULL;
}
if (!module->loaded) {
LOG(ERROR) << "After loading " << name << ", loaded==false: "
<< GetNSSErrorMessage();
SECMOD_DestroyModule(module);
return NULL;
}
return module;
}
#endif
static void DisableAESNIIfNeeded() {
if (NSS_VersionCheck("3.15") && !NSS_VersionCheck("3.15.4")) {
// Some versions of NSS have a bug that causes AVX instructions to be
// used without testing whether XSAVE is enabled by the operating system.
// In order to work around this, we disable AES-NI in NSS when we find
// that |has_avx()| is false (which includes the XSAVE test). See
// https://bugzilla.mozilla.org/show_bug.cgi?id=940794
base::CPU cpu;
if (cpu.has_avx_hardware() && !cpu.has_avx()) {
scoped_ptr<base::Environment> env(base::Environment::Create());
env->SetVar("NSS_DISABLE_HW_AES", "1");
}
}
}
#if !defined(USE_OPENSSL)
// If this is set to true NSS is forced to be initialized without a DB.
static bool force_nodb_init_;
#endif
bool tpm_token_enabled_for_nss_;
bool initializing_tpm_token_;
typedef std::vector<base::Closure> TPMReadyCallbackList;
TPMReadyCallbackList tpm_ready_callback_list_;
SECMODModule* chaps_module_;
crypto::ScopedPK11Slot tpm_slot_;
SECMODModule* root_;
#if defined(OS_CHROMEOS)
typedef std::map<std::string, ChromeOSUserData*> ChromeOSUserMap;
ChromeOSUserMap chromeos_user_map_;
ScopedPK11Slot test_system_slot_;
#endif
#if defined(USE_NSS_CERTS)
// TODO(davidben): When https://bugzilla.mozilla.org/show_bug.cgi?id=564011
// is fixed, we will no longer need the lock.
base::Lock write_lock_;
#endif // defined(USE_NSS_CERTS)
base::ThreadChecker thread_checker_;
};
#if !defined(USE_OPENSSL)
// static
bool NSSInitSingleton::force_nodb_init_ = false;
#endif
base::LazyInstance<NSSInitSingleton>::Leaky
g_nss_singleton = LAZY_INSTANCE_INITIALIZER;
} // namespace
#if defined(USE_NSS_CERTS)
ScopedPK11Slot OpenSoftwareNSSDB(const base::FilePath& path,
const std::string& description) {
const std::string modspec =
base::StringPrintf("configDir='sql:%s' tokenDescription='%s'",
path.value().c_str(),
description.c_str());
PK11SlotInfo* db_slot = SECMOD_OpenUserDB(modspec.c_str());
if (db_slot) {
if (PK11_NeedUserInit(db_slot))
PK11_InitPin(db_slot, NULL, NULL);
} else {
LOG(ERROR) << "Error opening persistent database (" << modspec
<< "): " << GetNSSErrorMessage();
}
return ScopedPK11Slot(db_slot);
}
void EarlySetupForNSSInit() {
base::FilePath database_dir = GetInitialConfigDirectory();
if (!database_dir.empty())
UseLocalCacheOfNSSDatabaseIfNFS(database_dir);
}
#endif
void EnsureNSPRInit() {
g_nspr_singleton.Get();
}
#if !defined(USE_OPENSSL)
void InitNSSSafely() {
// We might fork, but we haven't loaded any security modules.
DisableNSSForkCheck();
// If we're sandboxed, we shouldn't be able to open user security modules,
// but it's more correct to tell NSS to not even try.
// Loading user security modules would have security implications.
ForceNSSNoDBInit();
// Initialize NSS.
EnsureNSSInit();
}
#endif // !defined(USE_OPENSSL)
void EnsureNSSInit() {
// Initializing SSL causes us to do blocking IO.
// Temporarily allow it until we fix
// http://code.google.com/p/chromium/issues/detail?id=59847
base::ThreadRestrictions::ScopedAllowIO allow_io;
g_nss_singleton.Get();
}
#if !defined(USE_OPENSSL)
void ForceNSSNoDBInit() {
NSSInitSingleton::ForceNoDBInit();
}
void DisableNSSForkCheck() {
scoped_ptr<base::Environment> env(base::Environment::Create());
env->SetVar("NSS_STRICT_NOFORK", "DISABLED");
}
void LoadNSSLibraries() {
// Some NSS libraries are linked dynamically so load them here.
#if defined(USE_NSS_CERTS)
// Try to search for multiple directories to load the libraries.
std::vector<base::FilePath> paths;
// Use relative path to Search PATH for the library files.
paths.push_back(base::FilePath());
// For Debian derivatives NSS libraries are located here.
paths.push_back(base::FilePath("/usr/lib/nss"));
// Ubuntu 11.10 (Oneiric) and Debian Wheezy place the libraries here.
#if defined(ARCH_CPU_X86_64)
paths.push_back(base::FilePath("/usr/lib/x86_64-linux-gnu/nss"));
#elif defined(ARCH_CPU_X86)
paths.push_back(base::FilePath("/usr/lib/i386-linux-gnu/nss"));
#elif defined(ARCH_CPU_ARMEL)
#if defined(__ARM_PCS_VFP)
paths.push_back(base::FilePath("/usr/lib/arm-linux-gnueabihf/nss"));
#else
paths.push_back(base::FilePath("/usr/lib/arm-linux-gnueabi/nss"));
#endif // defined(__ARM_PCS_VFP)
#elif defined(ARCH_CPU_MIPSEL)
paths.push_back(base::FilePath("/usr/lib/mipsel-linux-gnu/nss"));
#endif // defined(ARCH_CPU_X86_64)