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// Copyright (c) 2013 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 "chromeos/cert_loader.h"
#include <algorithm>
#include <utility>
#include "base/bind.h"
#include "base/location.h"
#include "base/strings/string_number_conversions.h"
#include "base/task_runner_util.h"
#include "base/threading/worker_pool.h"
#include "crypto/nss_util.h"
#include "crypto/scoped_nss_types.h"
#include "net/cert/nss_cert_database.h"
#include "net/cert/nss_cert_database_chromeos.h"
#include "net/cert/x509_certificate.h"
namespace chromeos {
static CertLoader* g_cert_loader = NULL;
static bool g_force_hardware_backed_for_test = false;
// static
void CertLoader::Initialize() {
CHECK(!g_cert_loader);
g_cert_loader = new CertLoader();
}
// static
void CertLoader::Shutdown() {
CHECK(g_cert_loader);
delete g_cert_loader;
g_cert_loader = NULL;
}
// static
CertLoader* CertLoader::Get() {
CHECK(g_cert_loader) << "CertLoader::Get() called before Initialize()";
return g_cert_loader;
}
// static
bool CertLoader::IsInitialized() {
return g_cert_loader;
}
CertLoader::CertLoader()
: certificates_loaded_(false),
certificates_update_required_(false),
certificates_update_running_(false),
database_(NULL),
cert_list_(new net::CertificateList),
weak_factory_(this) {
}
CertLoader::~CertLoader() {
net::CertDatabase::GetInstance()->RemoveObserver(this);
}
void CertLoader::StartWithNSSDB(net::NSSCertDatabase* database) {
CHECK(!database_);
database_ = database;
// Start observing cert database for changes.
// Observing net::CertDatabase is preferred over observing |database_|
// directly, as |database_| observers receive only events generated directly
// by |database_|, so they may miss a few relevant ones.
// TODO(tbarzic): Once singleton NSSCertDatabase is removed, investigate if
// it would be OK to observe |database_| directly; or change NSSCertDatabase
// to send notification on all relevant changes.
net::CertDatabase::GetInstance()->AddObserver(this);
LoadCertificates();
}
void CertLoader::AddObserver(CertLoader::Observer* observer) {
observers_.AddObserver(observer);
}
void CertLoader::RemoveObserver(CertLoader::Observer* observer) {
observers_.RemoveObserver(observer);
}
// static
bool CertLoader::IsCertificateHardwareBacked(const net::X509Certificate* cert) {
if (g_force_hardware_backed_for_test)
return true;
PK11SlotInfo* slot = cert->os_cert_handle()->slot;
return slot && PK11_IsHW(slot);
}
bool CertLoader::CertificatesLoading() const {
return database_ && !certificates_loaded_;
}
// static
void CertLoader::ForceHardwareBackedForTesting() {
g_force_hardware_backed_for_test = true;
}
// static
//
// For background see this discussion on dev-tech-crypto.lists.mozilla.org:
// http://web.archiveorange.com/archive/v/6JJW7E40sypfZGtbkzxX
//
// NOTE: This function relies on the convention that the same PKCS#11 ID
// is shared between a certificate and its associated private and public
// keys. I tried to implement this with PK11_GetLowLevelKeyIDForCert(),
// but that always returns NULL on Chrome OS for me.
std::string CertLoader::GetPkcs11IdAndSlotForCert(
const net::X509Certificate& cert,
int* slot_id) {
DCHECK(slot_id);
CERTCertificateStr* cert_handle = cert.os_cert_handle();
SECKEYPrivateKey *priv_key =
PK11_FindKeyByAnyCert(cert_handle, NULL /* wincx */);
if (!priv_key)
return std::string();
*slot_id = static_cast<int>(PK11_GetSlotID(priv_key->pkcs11Slot));
// Get the CKA_ID attribute for a key.
SECItem* sec_item = PK11_GetLowLevelKeyIDForPrivateKey(priv_key);
std::string pkcs11_id;
if (sec_item) {
pkcs11_id = base::HexEncode(sec_item->data, sec_item->len);
SECITEM_FreeItem(sec_item, PR_TRUE);
}
SECKEY_DestroyPrivateKey(priv_key);
return pkcs11_id;
}
void CertLoader::LoadCertificates() {
CHECK(thread_checker_.CalledOnValidThread());
VLOG(1) << "LoadCertificates: " << certificates_update_running_;
if (certificates_update_running_) {
certificates_update_required_ = true;
return;
}
certificates_update_running_ = true;
certificates_update_required_ = false;
database_->ListCerts(
base::Bind(&CertLoader::UpdateCertificates, weak_factory_.GetWeakPtr()));
}
void CertLoader::UpdateCertificates(
scoped_ptr<net::CertificateList> cert_list) {
CHECK(thread_checker_.CalledOnValidThread());
DCHECK(certificates_update_running_);
VLOG(1) << "UpdateCertificates: " << cert_list->size();
// Ignore any existing certificates.
cert_list_ = std::move(cert_list);
bool initial_load = !certificates_loaded_;
certificates_loaded_ = true;
NotifyCertificatesLoaded(initial_load);
certificates_update_running_ = false;
if (certificates_update_required_)
LoadCertificates();
}
void CertLoader::NotifyCertificatesLoaded(bool initial_load) {
FOR_EACH_OBSERVER(Observer, observers_,
OnCertificatesLoaded(*cert_list_, initial_load));
}
void CertLoader::OnCACertChanged(const net::X509Certificate* cert) {
// This is triggered when a CA certificate is modified.
VLOG(1) << "OnCACertChanged";
LoadCertificates();
}
void CertLoader::OnCertAdded(const net::X509Certificate* cert) {
// This is triggered when a client certificate is added.
VLOG(1) << "OnCertAdded";
LoadCertificates();
}
void CertLoader::OnCertRemoved(const net::X509Certificate* cert) {
VLOG(1) << "OnCertRemoved";
LoadCertificates();
}
} // namespace chromeos
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