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118 lines
3.8 KiB
C++
118 lines
3.8 KiB
C++
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "net/ssl/ssl_config_service.h"
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#include <tuple>
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#include "base/lazy_instance.h"
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#include "base/synchronization/lock.h"
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#include "net/ssl/ssl_config_service_defaults.h"
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namespace net {
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SSLConfigService::SSLConfigService()
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: observer_list_(base::ObserverListPolicy::EXISTING_ONLY) {}
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// GlobalSSLObject holds a reference to a global SSL object, such as the
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// CRLSet. It simply wraps a lock around a scoped_refptr so that getting a
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// reference doesn't race with updating the global object.
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template <class T>
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class GlobalSSLObject {
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public:
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scoped_refptr<T> Get() const {
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base::AutoLock locked(lock_);
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return ssl_object_;
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}
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bool CompareAndSet(const scoped_refptr<T>& new_ssl_object,
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const scoped_refptr<T>& old_ssl_object) {
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base::AutoLock locked(lock_);
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if (ssl_object_ != old_ssl_object)
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return false;
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ssl_object_ = new_ssl_object;
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return true;
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}
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private:
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scoped_refptr<T> ssl_object_;
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mutable base::Lock lock_;
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};
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typedef GlobalSSLObject<CRLSet> GlobalCRLSet;
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base::LazyInstance<GlobalCRLSet>::Leaky g_crl_set = LAZY_INSTANCE_INITIALIZER;
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// static
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void SSLConfigService::SetCRLSetIfNewer(scoped_refptr<CRLSet> crl_set) {
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SetCRLSet(std::move(crl_set), /*if_newer=*/true);
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}
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// static
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void SSLConfigService::SetCRLSetForTesting(scoped_refptr<CRLSet> crl_set) {
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SetCRLSet(std::move(crl_set), /*if_newer=*/false);
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}
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// static
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scoped_refptr<CRLSet> SSLConfigService::GetCRLSet() {
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return g_crl_set.Get().Get();
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}
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void SSLConfigService::AddObserver(Observer* observer) {
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observer_list_.AddObserver(observer);
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}
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void SSLConfigService::RemoveObserver(Observer* observer) {
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observer_list_.RemoveObserver(observer);
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}
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void SSLConfigService::NotifySSLConfigChange() {
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for (auto& observer : observer_list_)
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observer.OnSSLConfigChanged();
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}
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SSLConfigService::~SSLConfigService() = default;
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void SSLConfigService::ProcessConfigUpdate(const SSLConfig& old_config,
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const SSLConfig& new_config) {
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bool config_changed =
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std::tie(old_config.rev_checking_enabled,
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old_config.rev_checking_required_local_anchors,
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old_config.sha1_local_anchors_enabled,
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old_config.common_name_fallback_local_anchors_enabled,
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old_config.version_min, old_config.version_max,
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old_config.tls13_variant, old_config.disabled_cipher_suites,
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old_config.channel_id_enabled, old_config.false_start_enabled,
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old_config.require_ecdhe) !=
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std::tie(new_config.rev_checking_enabled,
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new_config.rev_checking_required_local_anchors,
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new_config.sha1_local_anchors_enabled,
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new_config.common_name_fallback_local_anchors_enabled,
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new_config.version_min, new_config.version_max,
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new_config.tls13_variant, new_config.disabled_cipher_suites,
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new_config.channel_id_enabled, new_config.false_start_enabled,
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new_config.require_ecdhe);
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if (config_changed)
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NotifySSLConfigChange();
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}
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// static
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void SSLConfigService::SetCRLSet(scoped_refptr<CRLSet> crl_set, bool if_newer) {
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// Note: this can be called concurently with GetCRLSet().
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while (true) {
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scoped_refptr<CRLSet> old_crl_set(GetCRLSet());
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if (if_newer && old_crl_set && crl_set &&
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old_crl_set->sequence() >= crl_set->sequence()) {
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LOG(WARNING) << "Refusing to downgrade CRL set from #"
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<< old_crl_set->sequence() << " to #" << crl_set->sequence();
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break;
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}
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if (g_crl_set.Get().CompareAndSet(crl_set, old_crl_set))
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break;
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}
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}
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} // namespace net
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