nss_util.cc revision bb1529ce867d8845a77ec7cdf3e3003ef1771a40 
1// Copyright (c) 2012 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#include "crypto/nss_util.h"
6#include "crypto/nss_util_internal.h"
7
8#include <nss.h>
9#include <pk11pub.h>
10#include <plarena.h>
11#include <prerror.h>
12#include <prinit.h>
13#include <prtime.h>
14#include <secmod.h>
15
16#if defined(OS_LINUX)
17#include <linux/nfs_fs.h>
18#include <sys/vfs.h>
19#elif defined(OS_OPENBSD)
20#include <sys/mount.h>
21#include <sys/param.h>
22#endif
23
24#include <vector>
25
26#include "base/debug/alias.h"
27#include "base/environment.h"
28#include "base/file_util.h"
29#include "base/files/file_path.h"
30#include "base/files/scoped_temp_dir.h"
31#include "base/lazy_instance.h"
32#include "base/logging.h"
33#include "base/memory/scoped_ptr.h"
34#include "base/metrics/histogram.h"
35#include "base/native_library.h"
36#include "base/strings/stringprintf.h"
37#include "base/threading/thread_restrictions.h"
38#include "build/build_config.h"
39
40// USE_NSS means we use NSS for everything crypto-related.  If USE_NSS is not
41// defined, such as on Mac and Windows, we use NSS for SSL only -- we don't
42// use NSS for crypto or certificate verification, and we don't use the NSS
43// certificate and key databases.
44#if defined(USE_NSS)
45#include "base/synchronization/lock.h"
46#include "crypto/crypto_module_blocking_password_delegate.h"
47#endif  // defined(USE_NSS)
48
49namespace crypto {
50
51namespace {
52
53#if defined(OS_CHROMEOS)
54const char kNSSDatabaseName[] = "Real NSS database";
55
56// Constants for loading the Chrome OS TPM-backed PKCS #11 library.
57const char kChapsModuleName[] = "Chaps";
58const char kChapsPath[] = "libchaps.so";
59
60// Fake certificate authority database used for testing.
61static const base::FilePath::CharType kReadOnlyCertDB[] =
62    FILE_PATH_LITERAL("/etc/fake_root_ca/nssdb");
63#endif  // defined(OS_CHROMEOS)
64
65std::string GetNSSErrorMessage() {
66  std::string result;
67  if (PR_GetErrorTextLength()) {
68    scoped_ptr<char[]> error_text(new char[PR_GetErrorTextLength() + 1]);
69    PRInt32 copied = PR_GetErrorText(error_text.get());
70    result = std::string(error_text.get(), copied);
71  } else {
72    result = base::StringPrintf("NSS error code: %d", PR_GetError());
73  }
74  return result;
75}
76
77#if defined(USE_NSS)
78base::FilePath GetDefaultConfigDirectory() {
79  base::FilePath dir = file_util::GetHomeDir();
80  if (dir.empty()) {
81    LOG(ERROR) << "Failed to get home directory.";
82    return dir;
83  }
84  dir = dir.AppendASCII(".pki").AppendASCII("nssdb");
85  if (!file_util::CreateDirectory(dir)) {
86    LOG(ERROR) << "Failed to create " << dir.value() << " directory.";
87    dir.clear();
88  }
89  return dir;
90}
91
92// On non-chromeos platforms, return the default config directory.
93// On chromeos, return a read-only directory with fake root CA certs for testing
94// (which will not exist on non-testing images).  These root CA certs are used
95// by the local Google Accounts server mock we use when testing our login code.
96// If this directory is not present, NSS_Init() will fail.  It is up to the
97// caller to failover to NSS_NoDB_Init() at that point.
98base::FilePath GetInitialConfigDirectory() {
99#if defined(OS_CHROMEOS)
100  return base::FilePath(kReadOnlyCertDB);
101#else
102  return GetDefaultConfigDirectory();
103#endif  // defined(OS_CHROMEOS)
104}
105
106// This callback for NSS forwards all requests to a caller-specified
107// CryptoModuleBlockingPasswordDelegate object.
108char* PKCS11PasswordFunc(PK11SlotInfo* slot, PRBool retry, void* arg) {
109#if defined(OS_CHROMEOS)
110  // If we get asked for a password for the TPM, then return the
111  // well known password we use, as long as the TPM slot has been
112  // initialized.
113  if (crypto::IsTPMTokenReady()) {
114    std::string token_name;
115    std::string user_pin;
116    crypto::GetTPMTokenInfo(&token_name, &user_pin);
117    if (PK11_GetTokenName(slot) == token_name)
118      return PORT_Strdup(user_pin.c_str());
119  }
120#endif
121  crypto::CryptoModuleBlockingPasswordDelegate* delegate =
122      reinterpret_cast<crypto::CryptoModuleBlockingPasswordDelegate*>(arg);
123  if (delegate) {
124    bool cancelled = false;
125    std::string password = delegate->RequestPassword(PK11_GetTokenName(slot),
126                                                     retry != PR_FALSE,
127                                                     &cancelled);
128    if (cancelled)
129      return NULL;
130    char* result = PORT_Strdup(password.c_str());
131    password.replace(0, password.size(), password.size(), 0);
132    return result;
133  }
134  DLOG(ERROR) << "PK11 password requested with NULL arg";
135  return NULL;
136}
137
138// NSS creates a local cache of the sqlite database if it detects that the
139// filesystem the database is on is much slower than the local disk.  The
140// detection doesn't work with the latest versions of sqlite, such as 3.6.22
141// (NSS bug https://bugzilla.mozilla.org/show_bug.cgi?id=578561).  So we set
142// the NSS environment variable NSS_SDB_USE_CACHE to "yes" to override NSS's
143// detection when database_dir is on NFS.  See http://crbug.com/48585.
144//
145// TODO(wtc): port this function to other USE_NSS platforms.  It is defined
146// only for OS_LINUX and OS_OPENBSD simply because the statfs structure
147// is OS-specific.
148//
149// Because this function sets an environment variable it must be run before we
150// go multi-threaded.
151void UseLocalCacheOfNSSDatabaseIfNFS(const base::FilePath& database_dir) {
152#if defined(OS_LINUX) || defined(OS_OPENBSD)
153  struct statfs buf;
154  if (statfs(database_dir.value().c_str(), &buf) == 0) {
155#if defined(OS_LINUX)
156    if (buf.f_type == NFS_SUPER_MAGIC) {
157#elif defined(OS_OPENBSD)
158    if (strcmp(buf.f_fstypename, MOUNT_NFS) == 0) {
159#endif
160      scoped_ptr<base::Environment> env(base::Environment::Create());
161      const char* use_cache_env_var = "NSS_SDB_USE_CACHE";
162      if (!env->HasVar(use_cache_env_var))
163        env->SetVar(use_cache_env_var, "yes");
164    }
165  }
166#endif  // defined(OS_LINUX) || defined(OS_OPENBSD)
167}
168
169PK11SlotInfo* FindSlotWithTokenName(const std::string& token_name) {
170  AutoSECMODListReadLock auto_lock;
171  SECMODModuleList* head = SECMOD_GetDefaultModuleList();
172  for (SECMODModuleList* item = head; item != NULL; item = item->next) {
173    int slot_count = item->module->loaded ? item->module->slotCount : 0;
174    for (int i = 0; i < slot_count; i++) {
175      PK11SlotInfo* slot = item->module->slots[i];
176      if (PK11_GetTokenName(slot) == token_name)
177        return PK11_ReferenceSlot(slot);
178    }
179  }
180  return NULL;
181}
182
183#endif  // defined(USE_NSS)
184
185// A singleton to initialize/deinitialize NSPR.
186// Separate from the NSS singleton because we initialize NSPR on the UI thread.
187// Now that we're leaking the singleton, we could merge back with the NSS
188// singleton.
189class NSPRInitSingleton {
190 private:
191  friend struct base::DefaultLazyInstanceTraits<NSPRInitSingleton>;
192
193  NSPRInitSingleton() {
194    PR_Init(PR_USER_THREAD, PR_PRIORITY_NORMAL, 0);
195  }
196
197  // NOTE(willchan): We don't actually execute this code since we leak NSS to
198  // prevent non-joinable threads from using NSS after it's already been shut
199  // down.
200  ~NSPRInitSingleton() {
201    PL_ArenaFinish();
202    PRStatus prstatus = PR_Cleanup();
203    if (prstatus != PR_SUCCESS)
204      LOG(ERROR) << "PR_Cleanup failed; was NSPR initialized on wrong thread?";
205  }
206};
207
208base::LazyInstance<NSPRInitSingleton>::Leaky
209    g_nspr_singleton = LAZY_INSTANCE_INITIALIZER;
210
211// This is a LazyInstance so that it will be deleted automatically when the
212// unittest exits.  NSSInitSingleton is a LeakySingleton, so it would not be
213// deleted if it were a regular member.
214base::LazyInstance<base::ScopedTempDir> g_test_nss_db_dir =
215    LAZY_INSTANCE_INITIALIZER;
216
217// Force a crash with error info on NSS_NoDB_Init failure.
218void CrashOnNSSInitFailure() {
219  int nss_error = PR_GetError();
220  int os_error = PR_GetOSError();
221  base::debug::Alias(&nss_error);
222  base::debug::Alias(&os_error);
223  LOG(ERROR) << "Error initializing NSS without a persistent database: "
224             << GetNSSErrorMessage();
225  LOG(FATAL) << "nss_error=" << nss_error << ", os_error=" << os_error;
226}
227
228class NSSInitSingleton {
229 public:
230#if defined(OS_CHROMEOS)
231  void OpenPersistentNSSDB() {
232    if (!chromeos_user_logged_in_) {
233      // GetDefaultConfigDirectory causes us to do blocking IO on UI thread.
234      // Temporarily allow it until we fix http://crbug.com/70119
235      base::ThreadRestrictions::ScopedAllowIO allow_io;
236      chromeos_user_logged_in_ = true;
237
238      // This creates another DB slot in NSS that is read/write, unlike
239      // the fake root CA cert DB and the "default" crypto key
240      // provider, which are still read-only (because we initialized
241      // NSS before we had a cryptohome mounted).
242      software_slot_ = OpenUserDB(GetDefaultConfigDirectory(),
243                                  kNSSDatabaseName);
244    }
245  }
246
247  void EnableTPMTokenForNSS() {
248    tpm_token_enabled_for_nss_ = true;
249  }
250
251  bool InitializeTPMToken(const std::string& token_name,
252                          const std::string& user_pin) {
253    // If EnableTPMTokenForNSS hasn't been called, return false.
254    if (!tpm_token_enabled_for_nss_)
255      return false;
256
257    // If everything is already initialized, then return true.
258    if (chaps_module_ && tpm_slot_)
259      return true;
260
261    tpm_token_name_ = token_name;
262    tpm_user_pin_ = user_pin;
263
264    // This tries to load the Chaps module so NSS can talk to the hardware
265    // TPM.
266    if (!chaps_module_) {
267      chaps_module_ = LoadModule(
268          kChapsModuleName,
269          kChapsPath,
270          // For more details on these parameters, see:
271          // https://developer.mozilla.org/en/PKCS11_Module_Specs
272          // slotFlags=[PublicCerts] -- Certificates and public keys can be
273          //   read from this slot without requiring a call to C_Login.
274          // askpw=only -- Only authenticate to the token when necessary.
275          "NSS=\"slotParams=(0={slotFlags=[PublicCerts] askpw=only})\"");
276    }
277    if (chaps_module_){
278      // If this gets set, then we'll use the TPM for certs with
279      // private keys, otherwise we'll fall back to the software
280      // implementation.
281      tpm_slot_ = GetTPMSlot();
282
283      return tpm_slot_ != NULL;
284    }
285    return false;
286  }
287
288  void GetTPMTokenInfo(std::string* token_name, std::string* user_pin) {
289    if (!tpm_token_enabled_for_nss_) {
290      LOG(ERROR) << "GetTPMTokenInfo called before TPM Token is ready.";
291      return;
292    }
293    if (token_name)
294      *token_name = tpm_token_name_;
295    if (user_pin)
296      *user_pin = tpm_user_pin_;
297  }
298
299  bool IsTPMTokenReady() {
300    return tpm_slot_ != NULL;
301  }
302
303  PK11SlotInfo* GetTPMSlot() {
304    std::string token_name;
305    GetTPMTokenInfo(&token_name, NULL);
306    return FindSlotWithTokenName(token_name);
307  }
308#endif  // defined(OS_CHROMEOS)
309
310
311  bool OpenTestNSSDB() {
312    if (test_slot_)
313      return true;
314    if (!g_test_nss_db_dir.Get().CreateUniqueTempDir())
315      return false;
316    test_slot_ = OpenUserDB(g_test_nss_db_dir.Get().path(), "Test DB");
317    return !!test_slot_;
318  }
319
320  void CloseTestNSSDB() {
321    if (!test_slot_)
322      return;
323    SECStatus status = SECMOD_CloseUserDB(test_slot_);
324    if (status != SECSuccess)
325      PLOG(ERROR) << "SECMOD_CloseUserDB failed: " << PORT_GetError();
326    PK11_FreeSlot(test_slot_);
327    test_slot_ = NULL;
328    ignore_result(g_test_nss_db_dir.Get().Delete());
329  }
330
331  PK11SlotInfo* GetPublicNSSKeySlot() {
332    if (test_slot_)
333      return PK11_ReferenceSlot(test_slot_);
334    if (software_slot_)
335      return PK11_ReferenceSlot(software_slot_);
336    return PK11_GetInternalKeySlot();
337  }
338
339  PK11SlotInfo* GetPrivateNSSKeySlot() {
340    if (test_slot_)
341      return PK11_ReferenceSlot(test_slot_);
342
343#if defined(OS_CHROMEOS)
344    if (tpm_token_enabled_for_nss_) {
345      if (IsTPMTokenReady()) {
346        return PK11_ReferenceSlot(tpm_slot_);
347      } else {
348        // If we were supposed to get the hardware token, but were
349        // unable to, return NULL rather than fall back to sofware.
350        return NULL;
351      }
352    }
353#endif
354    // If we weren't supposed to enable the TPM for NSS, then return
355    // the software slot.
356    if (software_slot_)
357      return PK11_ReferenceSlot(software_slot_);
358    return PK11_GetInternalKeySlot();
359  }
360
361#if defined(USE_NSS)
362  base::Lock* write_lock() {
363    return &write_lock_;
364  }
365#endif  // defined(USE_NSS)
366
367  // This method is used to force NSS to be initialized without a DB.
368  // Call this method before NSSInitSingleton() is constructed.
369  static void ForceNoDBInit() {
370    force_nodb_init_ = true;
371  }
372
373 private:
374  friend struct base::DefaultLazyInstanceTraits<NSSInitSingleton>;
375
376  NSSInitSingleton()
377      : tpm_token_enabled_for_nss_(false),
378        chaps_module_(NULL),
379        software_slot_(NULL),
380        test_slot_(NULL),
381        tpm_slot_(NULL),
382        root_(NULL),
383        chromeos_user_logged_in_(false) {
384    base::TimeTicks start_time = base::TimeTicks::Now();
385    EnsureNSPRInit();
386
387    // We *must* have NSS >= 3.14.3.
388    COMPILE_ASSERT(
389        (NSS_VMAJOR == 3 && NSS_VMINOR == 14 && NSS_VPATCH >= 3) ||
390        (NSS_VMAJOR == 3 && NSS_VMINOR > 14) ||
391        (NSS_VMAJOR > 3),
392        nss_version_check_failed);
393    // Also check the run-time NSS version.
394    // NSS_VersionCheck is a >= check, not strict equality.
395    if (!NSS_VersionCheck("3.14.3")) {
396      LOG(FATAL) << "NSS_VersionCheck(\"3.14.3\") failed. NSS >= 3.14.3 is "
397                    "required. Please upgrade to the latest NSS, and if you "
398                    "still get this error, contact your distribution "
399                    "maintainer.";
400    }
401
402    SECStatus status = SECFailure;
403    bool nodb_init = force_nodb_init_;
404
405#if !defined(USE_NSS)
406    // Use the system certificate store, so initialize NSS without database.
407    nodb_init = true;
408#endif
409
410    if (nodb_init) {
411      status = NSS_NoDB_Init(NULL);
412      if (status != SECSuccess) {
413        CrashOnNSSInitFailure();
414        return;
415      }
416#if defined(OS_IOS)
417      root_ = InitDefaultRootCerts();
418#endif  // defined(OS_IOS)
419    } else {
420#if defined(USE_NSS)
421      base::FilePath database_dir = GetInitialConfigDirectory();
422      if (!database_dir.empty()) {
423        // This duplicates the work which should have been done in
424        // EarlySetupForNSSInit. However, this function is idempotent so
425        // there's no harm done.
426        UseLocalCacheOfNSSDatabaseIfNFS(database_dir);
427
428        // Initialize with a persistent database (likely, ~/.pki/nssdb).
429        // Use "sql:" which can be shared by multiple processes safely.
430        std::string nss_config_dir =
431            base::StringPrintf("sql:%s", database_dir.value().c_str());
432#if defined(OS_CHROMEOS)
433        status = NSS_Init(nss_config_dir.c_str());
434#else
435        status = NSS_InitReadWrite(nss_config_dir.c_str());
436#endif
437        if (status != SECSuccess) {
438          LOG(ERROR) << "Error initializing NSS with a persistent "
439                        "database (" << nss_config_dir
440                     << "): " << GetNSSErrorMessage();
441        }
442      }
443      if (status != SECSuccess) {
444        VLOG(1) << "Initializing NSS without a persistent database.";
445        status = NSS_NoDB_Init(NULL);
446        if (status != SECSuccess) {
447          CrashOnNSSInitFailure();
448          return;
449        }
450      }
451
452      PK11_SetPasswordFunc(PKCS11PasswordFunc);
453
454      // If we haven't initialized the password for the NSS databases,
455      // initialize an empty-string password so that we don't need to
456      // log in.
457      PK11SlotInfo* slot = PK11_GetInternalKeySlot();
458      if (slot) {
459        // PK11_InitPin may write to the keyDB, but no other thread can use NSS
460        // yet, so we don't need to lock.
461        if (PK11_NeedUserInit(slot))
462          PK11_InitPin(slot, NULL, NULL);
463        PK11_FreeSlot(slot);
464      }
465
466      root_ = InitDefaultRootCerts();
467#endif  // defined(USE_NSS)
468    }
469
470    // Disable MD5 certificate signatures. (They are disabled by default in
471    // NSS 3.14.)
472    NSS_SetAlgorithmPolicy(SEC_OID_MD5, 0, NSS_USE_ALG_IN_CERT_SIGNATURE);
473    NSS_SetAlgorithmPolicy(SEC_OID_PKCS1_MD5_WITH_RSA_ENCRYPTION,
474                           0, NSS_USE_ALG_IN_CERT_SIGNATURE);
475
476    // The UMA bit is conditionally set for this histogram in
477    // chrome/common/startup_metric_utils.cc .
478    HISTOGRAM_CUSTOM_TIMES("Startup.SlowStartupNSSInit",
479                           base::TimeTicks::Now() - start_time,
480                           base::TimeDelta::FromMilliseconds(10),
481                           base::TimeDelta::FromHours(1),
482                           50);
483  }
484
485  // NOTE(willchan): We don't actually execute this code since we leak NSS to
486  // prevent non-joinable threads from using NSS after it's already been shut
487  // down.
488  ~NSSInitSingleton() {
489    if (tpm_slot_) {
490      PK11_FreeSlot(tpm_slot_);
491      tpm_slot_ = NULL;
492    }
493    if (software_slot_) {
494      SECMOD_CloseUserDB(software_slot_);
495      PK11_FreeSlot(software_slot_);
496      software_slot_ = NULL;
497    }
498    CloseTestNSSDB();
499    if (root_) {
500      SECMOD_UnloadUserModule(root_);
501      SECMOD_DestroyModule(root_);
502      root_ = NULL;
503    }
504    if (chaps_module_) {
505      SECMOD_UnloadUserModule(chaps_module_);
506      SECMOD_DestroyModule(chaps_module_);
507      chaps_module_ = NULL;
508    }
509
510    SECStatus status = NSS_Shutdown();
511    if (status != SECSuccess) {
512      // We VLOG(1) because this failure is relatively harmless (leaking, but
513      // we're shutting down anyway).
514      VLOG(1) << "NSS_Shutdown failed; see http://crbug.com/4609";
515    }
516  }
517
518#if defined(USE_NSS) || defined(OS_IOS)
519  // Load nss's built-in root certs.
520  SECMODModule* InitDefaultRootCerts() {
521    SECMODModule* root = LoadModule("Root Certs", "libnssckbi.so", NULL);
522    if (root)
523      return root;
524
525    // Aw, snap.  Can't find/load root cert shared library.
526    // This will make it hard to talk to anybody via https.
527    NOTREACHED();
528    return NULL;
529  }
530
531  // Load the given module for this NSS session.
532  SECMODModule* LoadModule(const char* name,
533                           const char* library_path,
534                           const char* params) {
535    std::string modparams = base::StringPrintf(
536        "name=\"%s\" library=\"%s\" %s",
537        name, library_path, params ? params : "");
538
539    // Shouldn't need to const_cast here, but SECMOD doesn't properly
540    // declare input string arguments as const.  Bug
541    // https://bugzilla.mozilla.org/show_bug.cgi?id=642546 was filed
542    // on NSS codebase to address this.
543    SECMODModule* module = SECMOD_LoadUserModule(
544        const_cast<char*>(modparams.c_str()), NULL, PR_FALSE);
545    if (!module) {
546      LOG(ERROR) << "Error loading " << name << " module into NSS: "
547                 << GetNSSErrorMessage();
548      return NULL;
549    }
550    return module;
551  }
552#endif
553
554  static PK11SlotInfo* OpenUserDB(const base::FilePath& path,
555                                  const char* description) {
556    const std::string modspec =
557        base::StringPrintf("configDir='sql:%s' tokenDescription='%s'",
558                           path.value().c_str(), description);
559    PK11SlotInfo* db_slot = SECMOD_OpenUserDB(modspec.c_str());
560    if (db_slot) {
561      if (PK11_NeedUserInit(db_slot))
562        PK11_InitPin(db_slot, NULL, NULL);
563    }
564    else {
565      LOG(ERROR) << "Error opening persistent database (" << modspec
566                 << "): " << GetNSSErrorMessage();
567    }
568    return db_slot;
569  }
570
571  // If this is set to true NSS is forced to be initialized without a DB.
572  static bool force_nodb_init_;
573
574  bool tpm_token_enabled_for_nss_;
575  std::string tpm_token_name_;
576  std::string tpm_user_pin_;
577  SECMODModule* chaps_module_;
578  PK11SlotInfo* software_slot_;
579  PK11SlotInfo* test_slot_;
580  PK11SlotInfo* tpm_slot_;
581  SECMODModule* root_;
582  bool chromeos_user_logged_in_;
583#if defined(USE_NSS)
584  // TODO(davidben): When https://bugzilla.mozilla.org/show_bug.cgi?id=564011
585  // is fixed, we will no longer need the lock.
586  base::Lock write_lock_;
587#endif  // defined(USE_NSS)
588};
589
590// static
591bool NSSInitSingleton::force_nodb_init_ = false;
592
593base::LazyInstance<NSSInitSingleton>::Leaky
594    g_nss_singleton = LAZY_INSTANCE_INITIALIZER;
595}  // namespace
596
597#if defined(USE_NSS)
598void EarlySetupForNSSInit() {
599  base::FilePath database_dir = GetInitialConfigDirectory();
600  if (!database_dir.empty())
601    UseLocalCacheOfNSSDatabaseIfNFS(database_dir);
602}
603#endif
604
605void EnsureNSPRInit() {
606  g_nspr_singleton.Get();
607}
608
609void InitNSSSafely() {
610  // We might fork, but we haven't loaded any security modules.
611  DisableNSSForkCheck();
612  // If we're sandboxed, we shouldn't be able to open user security modules,
613  // but it's more correct to tell NSS to not even try.
614  // Loading user security modules would have security implications.
615  ForceNSSNoDBInit();
616  // Initialize NSS.
617  EnsureNSSInit();
618}
619
620void EnsureNSSInit() {
621  // Initializing SSL causes us to do blocking IO.
622  // Temporarily allow it until we fix
623  //   http://code.google.com/p/chromium/issues/detail?id=59847
624  base::ThreadRestrictions::ScopedAllowIO allow_io;
625  g_nss_singleton.Get();
626}
627
628void ForceNSSNoDBInit() {
629  NSSInitSingleton::ForceNoDBInit();
630}
631
632void DisableNSSForkCheck() {
633  scoped_ptr<base::Environment> env(base::Environment::Create());
634  env->SetVar("NSS_STRICT_NOFORK", "DISABLED");
635}
636
637void LoadNSSLibraries() {
638  // Some NSS libraries are linked dynamically so load them here.
639#if defined(USE_NSS)
640  // Try to search for multiple directories to load the libraries.
641  std::vector<base::FilePath> paths;
642
643  // Use relative path to Search PATH for the library files.
644  paths.push_back(base::FilePath());
645
646  // For Debian derivatives NSS libraries are located here.
647  paths.push_back(base::FilePath("/usr/lib/nss"));
648
649  // Ubuntu 11.10 (Oneiric) and Debian Wheezy place the libraries here.
650#if defined(ARCH_CPU_X86_64)
651  paths.push_back(base::FilePath("/usr/lib/x86_64-linux-gnu/nss"));
652#elif defined(ARCH_CPU_X86)
653  paths.push_back(base::FilePath("/usr/lib/i386-linux-gnu/nss"));
654#elif defined(ARCH_CPU_ARMEL)
655  paths.push_back(base::FilePath("/usr/lib/arm-linux-gnueabi/nss"));
656#elif defined(ARCH_CPU_MIPSEL)
657  paths.push_back(base::FilePath("/usr/lib/mipsel-linux-gnu/nss"));
658#endif
659
660  // A list of library files to load.
661  std::vector<std::string> libs;
662  libs.push_back("libsoftokn3.so");
663  libs.push_back("libfreebl3.so");
664
665  // For each combination of library file and path, check for existence and
666  // then load.
667  size_t loaded = 0;
668  for (size_t i = 0; i < libs.size(); ++i) {
669    for (size_t j = 0; j < paths.size(); ++j) {
670      base::FilePath path = paths[j].Append(libs[i]);
671      base::NativeLibrary lib = base::LoadNativeLibrary(path, NULL);
672      if (lib) {
673        ++loaded;
674        break;
675      }
676    }
677  }
678
679  if (loaded == libs.size()) {
680    VLOG(3) << "NSS libraries loaded.";
681  } else {
682    LOG(ERROR) << "Failed to load NSS libraries.";
683  }
684#endif
685}
686
687bool CheckNSSVersion(const char* version) {
688  return !!NSS_VersionCheck(version);
689}
690
691#if defined(USE_NSS)
692ScopedTestNSSDB::ScopedTestNSSDB()
693  : is_open_(g_nss_singleton.Get().OpenTestNSSDB()) {
694}
695
696ScopedTestNSSDB::~ScopedTestNSSDB() {
697  // Don't close when NSS is < 3.15.1, because it would require an additional
698  // sleep for 1 second after closing the database, due to
699  // http://bugzil.la/875601.
700  if (NSS_VersionCheck("3.15.1")) {
701    g_nss_singleton.Get().CloseTestNSSDB();
702  }
703}
704
705base::Lock* GetNSSWriteLock() {
706  return g_nss_singleton.Get().write_lock();
707}
708
709AutoNSSWriteLock::AutoNSSWriteLock() : lock_(GetNSSWriteLock()) {
710  // May be NULL if the lock is not needed in our version of NSS.
711  if (lock_)
712    lock_->Acquire();
713}
714
715AutoNSSWriteLock::~AutoNSSWriteLock() {
716  if (lock_) {
717    lock_->AssertAcquired();
718    lock_->Release();
719  }
720}
721
722AutoSECMODListReadLock::AutoSECMODListReadLock()
723      : lock_(SECMOD_GetDefaultModuleListLock()) {
724    SECMOD_GetReadLock(lock_);
725  }
726
727AutoSECMODListReadLock::~AutoSECMODListReadLock() {
728  SECMOD_ReleaseReadLock(lock_);
729}
730
731#endif  // defined(USE_NSS)
732
733#if defined(OS_CHROMEOS)
734void OpenPersistentNSSDB() {
735  g_nss_singleton.Get().OpenPersistentNSSDB();
736}
737
738void EnableTPMTokenForNSS() {
739  g_nss_singleton.Get().EnableTPMTokenForNSS();
740}
741
742void GetTPMTokenInfo(std::string* token_name, std::string* user_pin) {
743  g_nss_singleton.Get().GetTPMTokenInfo(token_name, user_pin);
744}
745
746bool IsTPMTokenReady() {
747  return g_nss_singleton.Get().IsTPMTokenReady();
748}
749
750bool InitializeTPMToken(const std::string& token_name,
751                        const std::string& user_pin) {
752  return g_nss_singleton.Get().InitializeTPMToken(token_name, user_pin);
753}
754#endif  // defined(OS_CHROMEOS)
755
756base::Time PRTimeToBaseTime(PRTime prtime) {
757  return base::Time::FromInternalValue(
758      prtime + base::Time::UnixEpoch().ToInternalValue());
759}
760
761PRTime BaseTimeToPRTime(base::Time time) {
762  return time.ToInternalValue() - base::Time::UnixEpoch().ToInternalValue();
763}
764
765PK11SlotInfo* GetPublicNSSKeySlot() {
766  return g_nss_singleton.Get().GetPublicNSSKeySlot();
767}
768
769PK11SlotInfo* GetPrivateNSSKeySlot() {
770  return g_nss_singleton.Get().GetPrivateNSSKeySlot();
771}
772
773}  // namespace crypto
774