blob: ac210e374e6352e75ad1cce8ebd24384c292b5cb [file] [log] [blame]
// Copyright (c) 2012 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.
#include "net/cert/cert_database.h"
#include <Security/Security.h>
#include "base/location.h"
#include "base/logging.h"
#include "base/mac/mac_logging.h"
#include "base/message_loop/message_loop.h"
#include "base/message_loop/message_loop_current.h"
#include "base/observer_list_threadsafe.h"
#include "base/process/process_handle.h"
#include "base/single_thread_task_runner.h"
#include "base/synchronization/lock.h"
#include "crypto/mac_security_services_lock.h"
#include "net/base/net_errors.h"
#include "net/cert/x509_certificate.h"
#include "starboard/types.h"
namespace net {
// Helper that observes events from the Keychain and forwards them to the
// given CertDatabase.
class CertDatabase::Notifier {
public:
// Creates a new Notifier that will forward Keychain events to |cert_db|.
// |message_loop| must refer to a thread with an associated CFRunLoop - a
// TYPE_UI thread. Events will be dispatched from this message loop.
Notifier(CertDatabase* cert_db, base::MessageLoop* message_loop)
: cert_db_(cert_db),
registered_(false),
called_shutdown_(false) {
// Ensure an associated CFRunLoop.
DCHECK(base::MessageLoopForUI::IsCurrent());
task_runner_ = message_loop->task_runner();
task_runner_->PostTask(FROM_HERE,
base::Bind(&Notifier::Init,
base::Unretained(this)));
}
// Should be called from the |task_runner_|'s sequence. Use Shutdown()
// to shutdown on arbitrary sequence.
~Notifier() {
DCHECK(called_shutdown_);
// Only unregister from the same sequence where registration was performed.
if (registered_ && task_runner_->RunsTasksInCurrentSequence())
SecKeychainRemoveCallback(&Notifier::KeychainCallback);
}
void Shutdown() {
called_shutdown_ = true;
if (!task_runner_->DeleteSoon(FROM_HERE, this)) {
// If the task runner is no longer running, it's safe to just delete
// the object, since no further events will or can be delivered by
// Keychain Services.
delete this;
}
}
private:
void Init() {
SecKeychainEventMask event_mask =
kSecKeychainListChangedMask | kSecTrustSettingsChangedEventMask;
OSStatus status = SecKeychainAddCallback(&Notifier::KeychainCallback,
event_mask, this);
if (status == noErr)
registered_ = true;
}
// SecKeychainCallback function that receives notifications from securityd
// and forwards them to the |cert_db_|.
static OSStatus KeychainCallback(SecKeychainEvent keychain_event,
SecKeychainCallbackInfo* info,
void* context);
CertDatabase* const cert_db_;
scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
bool registered_;
bool called_shutdown_;
};
// static
OSStatus CertDatabase::Notifier::KeychainCallback(
SecKeychainEvent keychain_event,
SecKeychainCallbackInfo* info,
void* context) {
Notifier* that = reinterpret_cast<Notifier*>(context);
if (info->version > SEC_KEYCHAIN_SETTINGS_VERS1) {
NOTREACHED();
return errSecWrongSecVersion;
}
if (info->pid == base::GetCurrentProcId()) {
// Ignore events generated by the current process, as the assumption is
// that they have already been handled. This may miss events that
// originated as a result of spawning native dialogs that allow the user
// to modify Keychain settings. However, err on the side of missing
// events rather than sending too many events.
return errSecSuccess;
}
switch (keychain_event) {
case kSecKeychainListChangedEvent:
case kSecTrustSettingsChangedEvent:
that->cert_db_->NotifyObserversCertDBChanged();
break;
default:
break;
}
return errSecSuccess;
}
void CertDatabase::SetMessageLoopForKeychainEvents() {
ReleaseNotifier();
notifier_ = new Notifier(this, base::MessageLoopCurrentForUI::Get());
}
void CertDatabase::ReleaseNotifier() {
// Shutdown will take care to delete the notifier on the right thread.
if (notifier_) {
notifier_->Shutdown();
notifier_ = nullptr;
}
}
} // namespace net