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// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef NET_CERT_CERT_DATABASE_H_
#define NET_CERT_CERT_DATABASE_H_
#include "base/memory/scoped_refptr.h"
#include "base/no_destructor.h"
#include "base/observer_list_threadsafe.h"
#include "build/build_config.h"
#include "net/base/net_export.h"
namespace net {
// This class allows callers to observe changes to the underlying certificate
// stores.
//
// TODO(davidben): This class is really just a giant global ObserverList. It
// does not do anything with the platform certificate and, in principle, //net's
// dependency on the platform is abstracted behind the CertVerifier and
// ClientCertStore interfaces. Ideally these signals would originate out of
// those interfaces' platform implementations.
class NET_EXPORT CertDatabase {
public:
// A CertDatabase::Observer will be notified on certificate database changes.
// The change could be either a user certificate is added/removed or trust on
// a certificate is changed. Observers can be registered via
// CertDatabase::AddObserver, and can un-register with
// CertDatabase::RemoveObserver.
class NET_EXPORT Observer {
public:
Observer(const Observer&) = delete;
Observer& operator=(const Observer&) = delete;
virtual ~Observer() = default;
// Called whenever the Cert Database is known to have changed.
// Typically, this will be in response to a CA certificate being added,
// removed, or its trust changed.
virtual void OnTrustStoreChanged() {}
// Called when a potential change to client certificates is detected. (Some
// platforms don't provide precise notifications and this may be notified
// on unrelated changes.)
virtual void OnClientCertStoreChanged() {}
protected:
Observer() = default;
};
// These values are persisted to logs. Entries should not be renumbered and
// numeric values should never be reused.
enum class HistogramNotificationType {
kTrust = 0,
kClientCert = 1,
kMaxValue = kClientCert
};
~CertDatabase() = delete;
// Returns the CertDatabase singleton.
static CertDatabase* GetInstance();
CertDatabase(const CertDatabase&) = delete;
CertDatabase& operator=(const CertDatabase&) = delete;
// Registers |observer| to receive notifications of certificate changes. The
// thread on which this is called is the thread on which |observer| will be
// called back with notifications.
void AddObserver(Observer* observer);
// Unregisters |observer| from receiving notifications. This must be called
// on the same thread on which AddObserver() was called.
void RemoveObserver(Observer* observer);
#if BUILDFLAG(IS_MAC)
// Start observing and forwarding events from Keychain services. May be
// called multiple times, and may be called on any thread.
static void StartListeningForKeychainEvents();
#endif
// Synthetically injects notifications to all observers. In general, this
// should only be called by the creator of the CertDatabase. Used to inject
// notifications from other DB interfaces.
void NotifyObserversTrustStoreChanged();
void NotifyObserversClientCertStoreChanged();
private:
friend base::NoDestructor<CertDatabase>;
CertDatabase();
const scoped_refptr<base::ObserverListThreadSafe<Observer>> observer_list_;
};
} // namespace net
#endif // NET_CERT_CERT_DATABASE_H_
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