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nss_util.cc
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// 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/metrics/histogram.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)
// 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;
}
private:
friend struct base::DefaultLazyInstanceTraits<NSSInitSingleton>;
NSSInitSingleton()
: tpm_token_enabled_for_nss_(false),
initializing_tpm_token_(false),
chaps_module_(NULL),
root_(NULL) {
base::TimeTicks start_time = base::TimeTicks::Now();
// 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 = force_nodb_init_;
#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);
// The UMA bit is conditionally set for this histogram in
// components/startup_metric_utils.cc .
LOCAL_HISTOGRAM_CUSTOM_TIMES("Startup.SlowStartupNSSInit",
base::TimeTicks::Now() - start_time,
base::TimeDelta::FromMilliseconds(10),
base::TimeDelta::FromHours(1),
50);
}
// 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 this is set to true NSS is forced to be initialized without a DB.
static bool force_nodb_init_;
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_;
};
// static
bool NSSInitSingleton::force_nodb_init_ = false;
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();
}
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();
}
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();
}
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)
// A list of library files to load.
std::vector<std::string> libs;
libs.push_back("libsoftokn3.so");
libs.push_back("libfreebl3.so");