crypto/nss_util.cc

   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
  49 namespace crypto {
  50
  51 namespace {
  52
  53 #if defined(OS_CHROMEOS)
  54 const char kNSSDatabaseName[] = "Real NSS database";
  55
  56 // Constants for loading the Chrome OS TPM-backed PKCS #11 library.
  57 const char kChapsModuleName[] = "Chaps";
  58 const char kChapsPath[] = "libchaps.so";
  59
  60 // Fake certificate authority database used for testing.
  61 static const base::FilePath::CharType kReadOnlyCertDB[] =
  62     FILE_PATH_LITERAL("/etc/fake_root_ca/nssdb");
  63 #endif  // defined(OS_CHROMEOS)
  64
  65 std::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)
  78 base::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-Chrome OS platforms, return the default config directory. On Chrome OS
  93 // test images, return a read-only directory with fake root CA certs (which are
  94 // used by the local Google Accounts server mock we use when testing our login
  95 // code). On Chrome OS non-test images (where the read-only directory doesn't
  96 // exist), return an empty path.
  97 base::FilePath GetInitialConfigDirectory() {
  98 #if defined(OS_CHROMEOS)
  99   base::FilePath database_dir = base::FilePath(kReadOnlyCertDB);
 100   if (!base::PathExists(database_dir))
 101     database_dir.clear();
 102   return database_dir;
 103 #else
 104   return GetDefaultConfigDirectory();
 105 #endif  // defined(OS_CHROMEOS)
 106 }
 107
 108 // This callback for NSS forwards all requests to a caller-specified
 109 // CryptoModuleBlockingPasswordDelegate object.
 110 char* PKCS11PasswordFunc(PK11SlotInfo* slot, PRBool retry, void* arg) {
 111 #if defined(OS_CHROMEOS)
 112   // If we get asked for a password for the TPM, then return the
 113   // well known password we use, as long as the TPM slot has been
 114   // initialized.
 115   if (crypto::IsTPMTokenReady()) {
 116     std::string token_name;
 117     std::string user_pin;
 118     crypto::GetTPMTokenInfo(&token_name, &user_pin);
 119     if (PK11_GetTokenName(slot) == token_name)
 120       return PORT_Strdup(user_pin.c_str());
 121   }
 122 #endif
 123   crypto::CryptoModuleBlockingPasswordDelegate* delegate =
 124       reinterpret_cast<crypto::CryptoModuleBlockingPasswordDelegate*>(arg);
 125   if (delegate) {
 126     bool cancelled = false;
 127     std::string password = delegate->RequestPassword(PK11_GetTokenName(slot),
 128                                                      retry != PR_FALSE,
 129                                                      &cancelled);
 130     if (cancelled)
 131       return NULL;
 132     char* result = PORT_Strdup(password.c_str());
 133     password.replace(0, password.size(), password.size(), 0);
 134     return result;
 135   }
 136   DLOG(ERROR) << "PK11 password requested with NULL arg";
 137   return NULL;
 138 }
 139
 140 // NSS creates a local cache of the sqlite database if it detects that the
 141 // filesystem the database is on is much slower than the local disk.  The
 142 // detection doesn't work with the latest versions of sqlite, such as 3.6.22
 143 // (NSS bug https://bugzilla.mozilla.org/show_bug.cgi?id=578561).  So we set
 144 // the NSS environment variable NSS_SDB_USE_CACHE to "yes" to override NSS's
 145 // detection when database_dir is on NFS.  See http://crbug.com/48585.
 146 //
 147 // TODO(wtc): port this function to other USE_NSS platforms.  It is defined
 148 // only for OS_LINUX and OS_OPENBSD simply because the statfs structure
 149 // is OS-specific.
 150 //
 151 // Because this function sets an environment variable it must be run before we
 152 // go multi-threaded.
 153 void UseLocalCacheOfNSSDatabaseIfNFS(const base::FilePath& database_dir) {
 154 #if defined(OS_LINUX) || defined(OS_OPENBSD)
 155   struct statfs buf;
 156   if (statfs(database_dir.value().c_str(), &buf) == 0) {
 157 #if defined(OS_LINUX)
 158     if (buf.f_type == NFS_SUPER_MAGIC) {
 159 #elif defined(OS_OPENBSD)
 160     if (strcmp(buf.f_fstypename, MOUNT_NFS) == 0) {
 161 #endif
 162       scoped_ptr<base::Environment> env(base::Environment::Create());
 163       const char* use_cache_env_var = "NSS_SDB_USE_CACHE";
 164       if (!env->HasVar(use_cache_env_var))
 165         env->SetVar(use_cache_env_var, "yes");
 166     }
 167   }
 168 #endif  // defined(OS_LINUX) || defined(OS_OPENBSD)
 169 }
 170
 171 PK11SlotInfo* FindSlotWithTokenName(const std::string& token_name) {
 172   AutoSECMODListReadLock auto_lock;
 173   SECMODModuleList* head = SECMOD_GetDefaultModuleList();
 174   for (SECMODModuleList* item = head; item != NULL; item = item->next) {
 175     int slot_count = item->module->loaded ? item->module->slotCount : 0;
 176     for (int i = 0; i < slot_count; i++) {
 177       PK11SlotInfo* slot = item->module->slots[i];
 178       if (PK11_GetTokenName(slot) == token_name)
 179         return PK11_ReferenceSlot(slot);
 180     }
 181   }
 182   return NULL;
 183 }
 184
 185 #endif  // defined(USE_NSS)
 186
 187 // A singleton to initialize/deinitialize NSPR.
 188 // Separate from the NSS singleton because we initialize NSPR on the UI thread.
 189 // Now that we're leaking the singleton, we could merge back with the NSS
 190 // singleton.
 191 class NSPRInitSingleton {
 192  private:
 193   friend struct base::DefaultLazyInstanceTraits<NSPRInitSingleton>;
 194
 195   NSPRInitSingleton() {
 196     PR_Init(PR_USER_THREAD, PR_PRIORITY_NORMAL, 0);
 197   }
 198
 199   // NOTE(willchan): We don't actually execute this code since we leak NSS to
 200   // prevent non-joinable threads from using NSS after it's already been shut
 201   // down.
 202   ~NSPRInitSingleton() {
 203     PL_ArenaFinish();
 204     PRStatus prstatus = PR_Cleanup();
 205     if (prstatus != PR_SUCCESS)
 206       LOG(ERROR) << "PR_Cleanup failed; was NSPR initialized on wrong thread?";
 207   }
 208 };
 209
 210 base::LazyInstance<NSPRInitSingleton>::Leaky
 211     g_nspr_singleton = LAZY_INSTANCE_INITIALIZER;
 212
 213 // This is a LazyInstance so that it will be deleted automatically when the
 214 // unittest exits.  NSSInitSingleton is a LeakySingleton, so it would not be
 215 // deleted if it were a regular member.
 216 base::LazyInstance<base::ScopedTempDir> g_test_nss_db_dir =
 217     LAZY_INSTANCE_INITIALIZER;
 218
 219 // Force a crash with error info on NSS_NoDB_Init failure.
 220 void CrashOnNSSInitFailure() {
 221   int nss_error = PR_GetError();
 222   int os_error = PR_GetOSError();
 223   base::debug::Alias(&nss_error);
 224   base::debug::Alias(&os_error);
 225   LOG(ERROR) << "Error initializing NSS without a persistent database: "
 226              << GetNSSErrorMessage();
 227   LOG(FATAL) << "nss_error=" << nss_error << ", os_error=" << os_error;
 228 }
 229
 230 class NSSInitSingleton {
 231  public:
 232 #if defined(OS_CHROMEOS)
 233   void OpenPersistentNSSDB() {
 234     if (!chromeos_user_logged_in_) {
 235       // GetDefaultConfigDirectory causes us to do blocking IO on UI thread.
 236       // Temporarily allow it until we fix http://crbug.com/70119
 237       base::ThreadRestrictions::ScopedAllowIO allow_io;
 238       chromeos_user_logged_in_ = true;
 239
 240       // This creates another DB slot in NSS that is read/write, unlike
 241       // the fake root CA cert DB and the "default" crypto key
 242       // provider, which are still read-only (because we initialized
 243       // NSS before we had a cryptohome mounted).
 244       software_slot_ = OpenUserDB(GetDefaultConfigDirectory(),
 245                                   kNSSDatabaseName);
 246     }
 247   }
 248
 249   void EnableTPMTokenForNSS() {
 250     tpm_token_enabled_for_nss_ = true;
 251   }
 252
 253   bool InitializeTPMToken(const std::string& token_name,
 254                           const std::string& user_pin) {
 255     // If EnableTPMTokenForNSS hasn't been called, return false.
 256     if (!tpm_token_enabled_for_nss_)
 257       return false;
 258
 259     // If everything is already initialized, then return true.
 260     if (chaps_module_ && tpm_slot_)
 261       return true;
 262
 263     tpm_token_name_ = token_name;
 264     tpm_user_pin_ = user_pin;
 265
 266     // This tries to load the Chaps module so NSS can talk to the hardware
 267     // TPM.
 268     if (!chaps_module_) {
 269       chaps_module_ = LoadModule(
 270           kChapsModuleName,
 271           kChapsPath,
 272           // For more details on these parameters, see:
 273           // https://developer.mozilla.org/en/PKCS11_Module_Specs
 274           // slotFlags=[PublicCerts] -- Certificates and public keys can be
 275           //   read from this slot without requiring a call to C_Login.
 276           // askpw=only -- Only authenticate to the token when necessary.
 277           "NSS=\"slotParams=(0={slotFlags=[PublicCerts] askpw=only})\"");
 278     }
 279     if (chaps_module_){
 280       // If this gets set, then we'll use the TPM for certs with
 281       // private keys, otherwise we'll fall back to the software
 282       // implementation.
 283       tpm_slot_ = GetTPMSlot();
 284
 285       return tpm_slot_ != NULL;
 286     }
 287     return false;
 288   }
 289
 290   void GetTPMTokenInfo(std::string* token_name, std::string* user_pin) {
 291     if (!tpm_token_enabled_for_nss_) {
 292       LOG(ERROR) << "GetTPMTokenInfo called before TPM Token is ready.";
 293       return;
 294     }
 295     if (token_name)
 296       *token_name = tpm_token_name_;
 297     if (user_pin)
 298       *user_pin = tpm_user_pin_;
 299   }
 300
 301   bool IsTPMTokenReady() {
 302     return tpm_slot_ != NULL;
 303   }
 304
 305   PK11SlotInfo* GetTPMSlot() {
 306     std::string token_name;
 307     GetTPMTokenInfo(&token_name, NULL);
 308     return FindSlotWithTokenName(token_name);
 309   }
 310 #endif  // defined(OS_CHROMEOS)
 311
 312
 313   bool OpenTestNSSDB() {
 314     if (test_slot_)
 315       return true;
 316     if (!g_test_nss_db_dir.Get().CreateUniqueTempDir())
 317       return false;
 318     test_slot_ = OpenUserDB(g_test_nss_db_dir.Get().path(), kTestTPMTokenName);
 319     return !!test_slot_;
 320   }
 321
 322   void CloseTestNSSDB() {
 323     if (!test_slot_)
 324       return;
 325     SECStatus status = SECMOD_CloseUserDB(test_slot_);
 326     if (status != SECSuccess)
 327       PLOG(ERROR) << "SECMOD_CloseUserDB failed: " << PORT_GetError();
 328     PK11_FreeSlot(test_slot_);
 329     test_slot_ = NULL;
 330     ignore_result(g_test_nss_db_dir.Get().Delete());
 331   }
 332
 333   PK11SlotInfo* GetPublicNSSKeySlot() {
 334     if (test_slot_)
 335       return PK11_ReferenceSlot(test_slot_);
 336     if (software_slot_)
 337       return PK11_ReferenceSlot(software_slot_);
 338     return PK11_GetInternalKeySlot();
 339   }
 340
 341   PK11SlotInfo* GetPrivateNSSKeySlot() {
 342     if (test_slot_)
 343       return PK11_ReferenceSlot(test_slot_);
 344
 345 #if defined(OS_CHROMEOS)
 346     if (tpm_token_enabled_for_nss_) {
 347       if (IsTPMTokenReady()) {
 348         return PK11_ReferenceSlot(tpm_slot_);
 349       } else {
 350         // If we were supposed to get the hardware token, but were
 351         // unable to, return NULL rather than fall back to sofware.
 352         return NULL;
 353       }
 354     }
 355 #endif
 356     // If we weren't supposed to enable the TPM for NSS, then return
 357     // the software slot.
 358     if (software_slot_)
 359       return PK11_ReferenceSlot(software_slot_);
 360     return PK11_GetInternalKeySlot();
 361   }
 362
 363 #if defined(USE_NSS)
 364   base::Lock* write_lock() {
 365     return &write_lock_;
 366   }
 367 #endif  // defined(USE_NSS)
 368
 369   // This method is used to force NSS to be initialized without a DB.
 370   // Call this method before NSSInitSingleton() is constructed.
 371   static void ForceNoDBInit() {
 372     force_nodb_init_ = true;
 373   }
 374
 375  private:
 376   friend struct base::DefaultLazyInstanceTraits<NSSInitSingleton>;
 377
 378   NSSInitSingleton()
 379       : tpm_token_enabled_for_nss_(false),
 380         chaps_module_(NULL),
 381         software_slot_(NULL),
 382         test_slot_(NULL),
 383         tpm_slot_(NULL),
 384         root_(NULL),
 385         chromeos_user_logged_in_(false) {
 386     base::TimeTicks start_time = base::TimeTicks::Now();
 387     EnsureNSPRInit();
 388
 389     // We *must* have NSS >= 3.14.3.
 390     COMPILE_ASSERT(
 391         (NSS_VMAJOR == 3 && NSS_VMINOR == 14 && NSS_VPATCH >= 3) ||
 392         (NSS_VMAJOR == 3 && NSS_VMINOR > 14) ||
 393         (NSS_VMAJOR > 3),
 394         nss_version_check_failed);
 395     // Also check the run-time NSS version.
 396     // NSS_VersionCheck is a >= check, not strict equality.
 397     if (!NSS_VersionCheck("3.14.3")) {
 398       LOG(FATAL) << "NSS_VersionCheck(\"3.14.3\") failed. NSS >= 3.14.3 is "
 399                     "required. Please upgrade to the latest NSS, and if you "
 400                     "still get this error, contact your distribution "
 401                     "maintainer.";
 402     }
 403
 404     SECStatus status = SECFailure;
 405     bool nodb_init = force_nodb_init_;
 406
 407 #if !defined(USE_NSS)
 408     // Use the system certificate store, so initialize NSS without database.
 409     nodb_init = true;
 410 #endif
 411
 412     if (nodb_init) {
 413       status = NSS_NoDB_Init(NULL);
 414       if (status != SECSuccess) {
 415         CrashOnNSSInitFailure();
 416         return;
 417       }
 418 #if defined(OS_IOS)
 419       root_ = InitDefaultRootCerts();
 420 #endif  // defined(OS_IOS)
 421     } else {
 422 #if defined(USE_NSS)
 423       base::FilePath database_dir = GetInitialConfigDirectory();
 424       if (!database_dir.empty()) {
 425         // This duplicates the work which should have been done in
 426         // EarlySetupForNSSInit. However, this function is idempotent so
 427         // there's no harm done.
 428         UseLocalCacheOfNSSDatabaseIfNFS(database_dir);
 429
 430         // Initialize with a persistent database (likely, ~/.pki/nssdb).
 431         // Use "sql:" which can be shared by multiple processes safely.
 432         std::string nss_config_dir =
 433             base::StringPrintf("sql:%s", database_dir.value().c_str());
 434 #if defined(OS_CHROMEOS)
 435         status = NSS_Init(nss_config_dir.c_str());
 436 #else
 437         status = NSS_InitReadWrite(nss_config_dir.c_str());
 438 #endif
 439         if (status != SECSuccess) {
 440           LOG(ERROR) << "Error initializing NSS with a persistent "
 441                         "database (" << nss_config_dir
 442                      << "): " << GetNSSErrorMessage();
 443         }
 444       }
 445       if (status != SECSuccess) {
 446         VLOG(1) << "Initializing NSS without a persistent database.";
 447         status = NSS_NoDB_Init(NULL);
 448         if (status != SECSuccess) {
 449           CrashOnNSSInitFailure();
 450           return;
 451         }
 452       }
 453
 454       PK11_SetPasswordFunc(PKCS11PasswordFunc);
 455
 456       // If we haven't initialized the password for the NSS databases,
 457       // initialize an empty-string password so that we don't need to
 458       // log in.
 459       PK11SlotInfo* slot = PK11_GetInternalKeySlot();
 460       if (slot) {
 461         // PK11_InitPin may write to the keyDB, but no other thread can use NSS
 462         // yet, so we don't need to lock.
 463         if (PK11_NeedUserInit(slot))
 464           PK11_InitPin(slot, NULL, NULL);
 465         PK11_FreeSlot(slot);
 466       }
 467
 468       root_ = InitDefaultRootCerts();
 469 #endif  // defined(USE_NSS)
 470     }
 471
 472     // Disable MD5 certificate signatures. (They are disabled by default in
 473     // NSS 3.14.)
 474     NSS_SetAlgorithmPolicy(SEC_OID_MD5, 0, NSS_USE_ALG_IN_CERT_SIGNATURE);
 475     NSS_SetAlgorithmPolicy(SEC_OID_PKCS1_MD5_WITH_RSA_ENCRYPTION,
 476                            0, NSS_USE_ALG_IN_CERT_SIGNATURE);
 477
 478     // The UMA bit is conditionally set for this histogram in
 479     // chrome/common/startup_metric_utils.cc .
 480     HISTOGRAM_CUSTOM_TIMES("Startup.SlowStartupNSSInit",
 481                            base::TimeTicks::Now() - start_time,
 482                            base::TimeDelta::FromMilliseconds(10),
 483                            base::TimeDelta::FromHours(1),
 484                            50);
 485   }
 486
 487   // NOTE(willchan): We don't actually execute this code since we leak NSS to
 488   // prevent non-joinable threads from using NSS after it's already been shut
 489   // down.
 490   ~NSSInitSingleton() {
 491     if (tpm_slot_) {
 492       PK11_FreeSlot(tpm_slot_);
 493       tpm_slot_ = NULL;
 494     }
 495     if (software_slot_) {
 496       SECMOD_CloseUserDB(software_slot_);
 497       PK11_FreeSlot(software_slot_);
 498       software_slot_ = NULL;
 499     }
 500     CloseTestNSSDB();
 501     if (root_) {
 502       SECMOD_UnloadUserModule(root_);
 503       SECMOD_DestroyModule(root_);
 504       root_ = NULL;
 505     }
 506     if (chaps_module_) {
 507       SECMOD_UnloadUserModule(chaps_module_);
 508       SECMOD_DestroyModule(chaps_module_);
 509       chaps_module_ = NULL;
 510     }
 511
 512     SECStatus status = NSS_Shutdown();
 513     if (status != SECSuccess) {
 514       // We VLOG(1) because this failure is relatively harmless (leaking, but
 515       // we're shutting down anyway).
 516       VLOG(1) << "NSS_Shutdown failed; see http://crbug.com/4609";
 517     }
 518   }
 519
 520 #if defined(USE_NSS) || defined(OS_IOS)
 521   // Load nss's built-in root certs.
 522   SECMODModule* InitDefaultRootCerts() {
 523     SECMODModule* root = LoadModule("Root Certs", "libnssckbi.so", NULL);
 524     if (root)
 525       return root;
 526
 527     // Aw, snap.  Can't find/load root cert shared library.
 528     // This will make it hard to talk to anybody via https.
 529     NOTREACHED();
 530     return NULL;
 531   }
 532
 533   // Load the given module for this NSS session.
 534   SECMODModule* LoadModule(const char* name,
 535                            const char* library_path,
 536                            const char* params) {
 537     std::string modparams = base::StringPrintf(
 538         "name=\"%s\" library=\"%s\" %s",
 539         name, library_path, params ? params : "");
 540
 541     // Shouldn't need to const_cast here, but SECMOD doesn't properly
 542     // declare input string arguments as const.  Bug
 543     // https://bugzilla.mozilla.org/show_bug.cgi?id=642546 was filed
 544     // on NSS codebase to address this.
 545     SECMODModule* module = SECMOD_LoadUserModule(
 546         const_cast<char*>(modparams.c_str()), NULL, PR_FALSE);
 547     if (!module) {
 548       LOG(ERROR) << "Error loading " << name << " module into NSS: "
 549                  << GetNSSErrorMessage();
 550       return NULL;
 551     }
 552     return module;
 553   }
 554 #endif
 555
 556   static PK11SlotInfo* OpenUserDB(const base::FilePath& path,
 557                                   const char* description) {
 558     const std::string modspec =
 559         base::StringPrintf("configDir='sql:%s' tokenDescription='%s'",
 560                            path.value().c_str(), description);
 561     PK11SlotInfo* db_slot = SECMOD_OpenUserDB(modspec.c_str());
 562     if (db_slot) {
 563       if (PK11_NeedUserInit(db_slot))
 564         PK11_InitPin(db_slot, NULL, NULL);
 565     }
 566     else {
 567       LOG(ERROR) << "Error opening persistent database (" << modspec
 568                  << "): " << GetNSSErrorMessage();
 569     }
 570     return db_slot;
 571   }
 572
 573   // If this is set to true NSS is forced to be initialized without a DB.
 574   static bool force_nodb_init_;
 575
 576   bool tpm_token_enabled_for_nss_;
 577   std::string tpm_token_name_;
 578   std::string tpm_user_pin_;
 579   SECMODModule* chaps_module_;
 580   PK11SlotInfo* software_slot_;
 581   PK11SlotInfo* test_slot_;
 582   PK11SlotInfo* tpm_slot_;
 583   SECMODModule* root_;
 584   bool chromeos_user_logged_in_;
 585 #if defined(USE_NSS)
 586   // TODO(davidben): When https://bugzilla.mozilla.org/show_bug.cgi?id=564011
 587   // is fixed, we will no longer need the lock.
 588   base::Lock write_lock_;
 589 #endif  // defined(USE_NSS)
 590 };
 591
 592 // static
 593 bool NSSInitSingleton::force_nodb_init_ = false;
 594
 595 base::LazyInstance<NSSInitSingleton>::Leaky
 596     g_nss_singleton = LAZY_INSTANCE_INITIALIZER;
 597 }  // namespace
 598
 599 const char kTestTPMTokenName[] = "Test DB";
 600
 601 #if defined(USE_NSS)
 602 void EarlySetupForNSSInit() {
 603   base::FilePath database_dir = GetInitialConfigDirectory();
 604   if (!database_dir.empty())
 605     UseLocalCacheOfNSSDatabaseIfNFS(database_dir);
 606 }
 607 #endif
 608
 609 void EnsureNSPRInit() {
 610   g_nspr_singleton.Get();
 611 }
 612
 613 void InitNSSSafely() {
 614   // We might fork, but we haven't loaded any security modules.
 615   DisableNSSForkCheck();
 616   // If we're sandboxed, we shouldn't be able to open user security modules,
 617   // but it's more correct to tell NSS to not even try.
 618   // Loading user security modules would have security implications.
 619   ForceNSSNoDBInit();
 620   // Initialize NSS.
 621   EnsureNSSInit();
 622 }
 623
 624 void EnsureNSSInit() {
 625   // Initializing SSL causes us to do blocking IO.
 626   // Temporarily allow it until we fix
 627   //   http://code.google.com/p/chromium/issues/detail?id=59847
 628   base::ThreadRestrictions::ScopedAllowIO allow_io;
 629   g_nss_singleton.Get();
 630 }
 631
 632 void ForceNSSNoDBInit() {
 633   NSSInitSingleton::ForceNoDBInit();
 634 }
 635
 636 void DisableNSSForkCheck() {
 637   scoped_ptr<base::Environment> env(base::Environment::Create());
 638   env->SetVar("NSS_STRICT_NOFORK", "DISABLED");
 639 }
 640
 641 void LoadNSSLibraries() {
 642   // Some NSS libraries are linked dynamically so load them here.
 643 #if defined(USE_NSS)
 644   // Try to search for multiple directories to load the libraries.
 645   std::vector<base::FilePath> paths;
 646
 647   // Use relative path to Search PATH for the library files.
 648   paths.push_back(base::FilePath());
 649
 650   // For Debian derivatives NSS libraries are located here.
 651   paths.push_back(base::FilePath("/usr/lib/nss"));
 652
 653   // Ubuntu 11.10 (Oneiric) and Debian Wheezy place the libraries here.
 654 #if defined(ARCH_CPU_X86_64)
 655   paths.push_back(base::FilePath("/usr/lib/x86_64-linux-gnu/nss"));
 656 #elif defined(ARCH_CPU_X86)
 657   paths.push_back(base::FilePath("/usr/lib/i386-linux-gnu/nss"));
 658 #elif defined(ARCH_CPU_ARMEL)
 659   paths.push_back(base::FilePath("/usr/lib/arm-linux-gnueabi/nss"));
 660 #elif defined(ARCH_CPU_MIPSEL)
 661   paths.push_back(base::FilePath("/usr/lib/mipsel-linux-gnu/nss"));
 662 #endif
 663
 664   // A list of library files to load.
 665   std::vector<std::string> libs;
 666   libs.push_back("libsoftokn3.so");
 667   libs.push_back("libfreebl3.so");
 668
 669   // For each combination of library file and path, check for existence and
 670   // then load.
 671   size_t loaded = 0;
 672   for (size_t i = 0; i < libs.size(); ++i) {
 673     for (size_t j = 0; j < paths.size(); ++j) {
 674       base::FilePath path = paths[j].Append(libs[i]);
 675       base::NativeLibrary lib = base::LoadNativeLibrary(path, NULL);
 676       if (lib) {
 677         ++loaded;
 678         break;
 679       }
 680     }
 681   }
 682
 683   if (loaded == libs.size()) {
 684     VLOG(3) << "NSS libraries loaded.";
 685   } else {
 686     LOG(ERROR) << "Failed to load NSS libraries.";
 687   }
 688 #endif
 689 }
 690
 691 bool CheckNSSVersion(const char* version) {
 692   return !!NSS_VersionCheck(version);
 693 }
 694
 695 #if defined(USE_NSS)
 696 ScopedTestNSSDB::ScopedTestNSSDB()
 697   : is_open_(g_nss_singleton.Get().OpenTestNSSDB()) {
 698 }
 699
 700 ScopedTestNSSDB::~ScopedTestNSSDB() {
 701   // Don't close when NSS is < 3.15.1, because it would require an additional
 702   // sleep for 1 second after closing the database, due to
 703   // http://bugzil.la/875601.
 704   if (NSS_VersionCheck("3.15.1")) {
 705     g_nss_singleton.Get().CloseTestNSSDB();
 706   }
 707 }
 708
 709 base::Lock* GetNSSWriteLock() {
 710   return g_nss_singleton.Get().write_lock();
 711 }
 712
 713 AutoNSSWriteLock::AutoNSSWriteLock() : lock_(GetNSSWriteLock()) {
 714   // May be NULL if the lock is not needed in our version of NSS.
 715   if (lock_)
 716     lock_->Acquire();
 717 }
 718
 719 AutoNSSWriteLock::~AutoNSSWriteLock() {
 720   if (lock_) {
 721     lock_->AssertAcquired();
 722     lock_->Release();
 723   }
 724 }
 725
 726 AutoSECMODListReadLock::AutoSECMODListReadLock()
 727       : lock_(SECMOD_GetDefaultModuleListLock()) {
 728     SECMOD_GetReadLock(lock_);
 729   }
 730
 731 AutoSECMODListReadLock::~AutoSECMODListReadLock() {
 732   SECMOD_ReleaseReadLock(lock_);
 733 }
 734
 735 #endif  // defined(USE_NSS)
 736
 737 #if defined(OS_CHROMEOS)
 738 void OpenPersistentNSSDB() {
 739   g_nss_singleton.Get().OpenPersistentNSSDB();
 740 }
 741
 742 void EnableTPMTokenForNSS() {
 743   g_nss_singleton.Get().EnableTPMTokenForNSS();
 744 }
 745
 746 void GetTPMTokenInfo(std::string* token_name, std::string* user_pin) {
 747   g_nss_singleton.Get().GetTPMTokenInfo(token_name, user_pin);
 748 }
 749
 750 bool IsTPMTokenReady() {
 751   return g_nss_singleton.Get().IsTPMTokenReady();
 752 }
 753
 754 bool InitializeTPMToken(const std::string& token_name,
 755                         const std::string& user_pin) {
 756   return g_nss_singleton.Get().InitializeTPMToken(token_name, user_pin);
 757 }
 758 #endif  // defined(OS_CHROMEOS)
 759
 760 base::Time PRTimeToBaseTime(PRTime prtime) {
 761   return base::Time::FromInternalValue(
 762       prtime + base::Time::UnixEpoch().ToInternalValue());
 763 }
 764
 765 PRTime BaseTimeToPRTime(base::Time time) {
 766   return time.ToInternalValue() - base::Time::UnixEpoch().ToInternalValue();
 767 }
 768
 769 PK11SlotInfo* GetPublicNSSKeySlot() {
 770   return g_nss_singleton.Get().GetPublicNSSKeySlot();
 771 }
 772
 773 PK11SlotInfo* GetPrivateNSSKeySlot() {
 774   return g_nss_singleton.Get().GetPrivateNSSKeySlot();
 775 }
 776
 777 }  // namespace crypto