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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.
#ifndef CHROMEOS_CERT_LOADER_H_
#define CHROMEOS_CERT_LOADER_H_
#include <string>
#include "base/basictypes.h"
#include "base/memory/ref_counted.h"
#include "base/memory/weak_ptr.h"
#include "base/observer_list.h"
#include "base/threading/thread_checker.h"
#include "chromeos/chromeos_export.h"
#include "chromeos/tpm_token_loader.h"
#include "net/cert/cert_database.h"
namespace base {
class TaskRunner;
}
namespace net {
class X509Certificate;
}
namespace chromeos {
// This class is responsible for loading certificates once the TPM is
// initialized. It is expected to be constructed on the UI thread and public
// methods should all be called from the UI thread.
// When certificates have been loaded (after login completes and tpm token is
// initialized), or the cert database changes, observers are called with
// OnCertificatesLoaded().
// TODO(tbarzic): Remove direct dependency on TPMTokenLoader. The reason
// TPMTokenLoader has to be observed is to make sure singleton NSS DB is
// initialized before certificate loading starts. CertLoader should use
// (primary) user specific NSS DB, whose loading already takes this into
// account (crypto::GetPrivateSlotForChromeOSUser waits until TPM token is
// ready).
class CHROMEOS_EXPORT CertLoader : public net::CertDatabase::Observer,
public TPMTokenLoader::Observer {
public:
class Observer {
public:
// Called when the certificates, passed for convenience as |cert_list|,
// have completed loading. |initial_load| is true the first time this
// is called.
virtual void OnCertificatesLoaded(const net::CertificateList& cert_list,
bool initial_load) = 0;
protected:
virtual ~Observer() {}
};
// Sets the global instance. Must be called before any calls to Get().
static void Initialize();
// Destroys the global instance.
static void Shutdown();
// Gets the global instance. Initialize() must be called first.
static CertLoader* Get();
// Returns true if the global instance has been initialized.
static bool IsInitialized();
static std::string GetPkcs11IdForCert(const net::X509Certificate& cert);
// Sets the task runner that any slow calls will be made from, e.g. calls
// to the NSS database. If not set, uses base::WorkerPool.
void SetSlowTaskRunnerForTest(
const scoped_refptr<base::TaskRunner>& task_runner);
void AddObserver(CertLoader::Observer* observer);
void RemoveObserver(CertLoader::Observer* observer);
// Returns true if the TPM is available for hardware-backed certificates.
bool IsHardwareBacked() const;
// Returns true when the certificate list has been requested but not loaded.
bool CertificatesLoading() const;
bool certificates_loaded() const { return certificates_loaded_; }
// This will be empty until certificates_loaded() is true.
const net::CertificateList& cert_list() const { return cert_list_; }
// Getters for cached TPM token info.
std::string tpm_user_pin() const { return tpm_user_pin_; }
std::string tpm_token_name() const { return tpm_token_name_; }
int tpm_token_slot_id() const { return tpm_token_slot_id_; }
private:
CertLoader();
virtual ~CertLoader();
// Starts certificate loading.
void RequestCertificates();
// Trigger a certificate load. If a certificate loading task is already in
// progress, will start a reload once the current task finished.
void LoadCertificates();
// Called if a certificate load task is finished.
void UpdateCertificates(net::CertificateList* cert_list);
void NotifyCertificatesLoaded(bool initial_load);
// net::CertDatabase::Observer
virtual void OnCACertChanged(const net::X509Certificate* cert) OVERRIDE;
virtual void OnCertAdded(const net::X509Certificate* cert) OVERRIDE;
virtual void OnCertRemoved(const net::X509Certificate* cert) OVERRIDE;
// chromeos::TPMTokenLoader::Observer
virtual void OnTPMTokenReady(const std::string& tpm_user_pin,
const std::string& tpm_token_name,
int tpm_token_slot_id) OVERRIDE;
ObserverList<Observer> observers_;
// Flags describing current CertLoader state.
bool certificates_requested_;
bool certificates_loaded_;
bool certificates_update_required_;
bool certificates_update_running_;
// Cached TPM token info. Set when the |OnTPMTokenReady| gets called.
std::string tpm_user_pin_;
std::string tpm_token_name_;
int tpm_token_slot_id_;
// Cached Certificates.
net::CertificateList cert_list_;
base::ThreadChecker thread_checker_;
// TaskRunner for other slow tasks. May be set in tests.
scoped_refptr<base::TaskRunner> slow_task_runner_for_test_;
base::WeakPtrFactory<CertLoader> weak_factory_;
DISALLOW_COPY_AND_ASSIGN(CertLoader);
};
} // namespace chromeos
#endif // CHROMEOS_CERT_LOADER_H_
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