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// Copyright 2021 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_BROWSER_NET_NSS_SERVICE_H_
#define CHROME_BROWSER_NET_NSS_SERVICE_H_
#include <memory>
#include "base/functional/callback.h"
#include "base/memory/raw_ptr.h"
#include "build/buildflag.h"
#include "build/chromeos_buildflags.h"
#include "components/keyed_service/core/keyed_service.h"
namespace content {
class BrowserContext;
} // namespace content
namespace net {
class NSSCertDatabase;
} // namespace net
// `NssCertDatabaseGetter` is a callback that MUST only be invoked on the IO
// thread, and will either synchronously return the associated
// `NSSCertDatabase*` (if available), or nullptr along with a commitment to
// asynchronously invoke the caller-supplied callback once the
// `NSSCertDatabase*` has been initialized.
// Ownership of the `NSSCertDatabase` is not transferred, and the lifetime
// should only be considered valid for the current Task.
//
// TODO(crbug.com/40753707): Provide better lifetime guarantees.
using NssCertDatabaseGetter = base::OnceCallback<net::NSSCertDatabase*(
base::OnceCallback<void(net::NSSCertDatabase*)> callback)>;
// Service that owns and initializes the per-`BrowserContext` certificate
// database.
// On some platforms, this may be a per-`BrowserContext` `KeyedService` that
// returns a system-wide shared `NSSCertDatabase`, if the configuration is
// system-wide.
class NssService : public KeyedService {
public:
explicit NssService(content::BrowserContext* context);
NssService(const NssService&) = delete;
NssService& operator=(const NssService&) = delete;
~NssService() override;
// Returns an `NssCertDatabaseGetter` that may only be invoked on the IO
// thread. To avoid UAF, the getter must be immediately posted to the IO
// thread and then invoked. While the returned getter must be invoked on
// the IO thread, this method itself may only be invoked on the UI thread,
// where the NssService lives.
virtual NssCertDatabaseGetter CreateNSSCertDatabaseGetterForIOThread();
// Unsafely returns the `NssCertDatabase` directly to the caller (on the UI
// thread). This is unsafe, because if the `content::BrowserContext` / this
// `KeyedService` has begun shutting down, the `NssCertDatabase` may no
// longer be valid. For unit tests, this is simply a convenience helper when
// running everything on a single thread, but is not safe to use for
// production.
void UnsafelyGetNSSCertDatabaseForTesting(
base::OnceCallback<void(net::NSSCertDatabase*)> callback);
private:
#if BUILDFLAG(IS_CHROMEOS)
// Owns and manages access to the net::NSSCertDatabaseChromeOS.
class NSSCertDatabaseChromeOSManager;
// Created on the UI thread, but after that, initialized, accessed, and
// destroyed exclusively on the IO thread.
std::unique_ptr<NSSCertDatabaseChromeOSManager> nss_cert_database_manager_;
#endif
};
#endif // CHROME_BROWSER_NET_NSS_SERVICE_H_
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