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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 <vector>
#include "base/compiler_specific.h"
#include "base/macros.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 "net/cert/cert_database.h"
namespace net {
class NSSCertDatabase;
class X509Certificate;
typedef std::vector<scoped_refptr<X509Certificate> > CertificateList;
}
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().
class CHROMEOS_EXPORT CertLoader : public net::CertDatabase::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();
// Returns the PKCS#11 attribute CKA_ID for a certificate as an upper-case
// hex string and sets |slot_id| to the id of the containing slot, or returns
// an empty string and doesn't modify |slot_id| if the PKCS#11 id could not be
// determined.
static std::string GetPkcs11IdAndSlotForCert(const net::X509Certificate& cert,
int* slot_id);
// Starts the CertLoader with the NSS cert database.
// The CertLoader will _not_ take the ownership of the database, but it
// expects it to stay alive at least until the shutdown starts on the main
// thread. This assumes that |StartWithNSSDB| and other methods directly
// using |database_| are not called during shutdown.
void StartWithNSSDB(net::NSSCertDatabase* database);
void AddObserver(CertLoader::Observer* observer);
void RemoveObserver(CertLoader::Observer* observer);
// Returns true if |cert| is hardware backed. See also
// ForceHardwareBackedForTesting().
static bool IsCertificateHardwareBacked(const net::X509Certificate* cert);
// 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_; }
// Called in tests if |IsCertificateHardwareBacked()| should always return
// true.
static void ForceHardwareBackedForTesting();
private:
CertLoader();
~CertLoader() override;
// Trigger a certificate load. If a certificate loading task is already in
// progress, will start a reload once the current task is finished.
void LoadCertificates();
// Called if a certificate load task is finished.
void UpdateCertificates(scoped_ptr<net::CertificateList> cert_list);
void NotifyCertificatesLoaded(bool initial_load);
// net::CertDatabase::Observer
void OnCACertChanged(const net::X509Certificate* cert) override;
void OnCertAdded(const net::X509Certificate* cert) override;
void OnCertRemoved(const net::X509Certificate* cert) override;
base::ObserverList<Observer> observers_;
// Flags describing current CertLoader state.
bool certificates_loaded_;
bool certificates_update_required_;
bool certificates_update_running_;
// The user-specific NSS certificate database from which the certificates
// should be loaded.
net::NSSCertDatabase* database_;
// Cached Certificates loaded from the database.
scoped_ptr<net::CertificateList> cert_list_;
base::ThreadChecker thread_checker_;
base::WeakPtrFactory<CertLoader> weak_factory_;
DISALLOW_COPY_AND_ASSIGN(CertLoader);
};
} // namespace chromeos
#endif // CHROMEOS_CERT_LOADER_H_
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