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// Copyright 2019 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/extensions/api/messaging/native_messaging_launch_from_native.h"
#include <memory>
#include <string_view>
#include <utility>
#include "base/functional/bind.h"
#include "base/functional/callback_helpers.h"
#include "base/strings/strcat.h"
#include "base/strings/string_util.h"
#include "base/task/sequenced_task_runner.h"
#include "base/timer/timer.h"
#include "chrome/browser/browser_process.h"
#include "chrome/browser/extensions/api/messaging/native_message_process_host.h"
#include "chrome/browser/extensions/api/messaging/native_process_launcher.h"
#include "chrome/browser/profiles/profile.h"
#include "chrome/common/extensions/manifest_handlers/natively_connectable_handler.h"
#include "components/keep_alive_registry/keep_alive_types.h"
#include "components/keep_alive_registry/scoped_keep_alive.h"
#include "content/public/browser/browser_task_traits.h"
#include "content/public/browser/browser_thread.h"
#include "extensions/browser/api/messaging/channel_endpoint.h"
#include "extensions/browser/api/messaging/message_service.h"
#include "extensions/browser/api/messaging/native_message_host.h"
#include "extensions/browser/api/messaging/native_message_port.h"
#include "extensions/browser/event_router.h"
#include "extensions/browser/extension_registry.h"
#include "extensions/common/api/messaging/messaging_endpoint.h"
#include "extensions/common/extension_features.h"
#include "extensions/common/extension_id.h"
#include "extensions/common/mojom/message_port.mojom-shared.h"
#include "extensions/common/permissions/permission_set.h"
#include "extensions/common/permissions/permissions_data.h"
#include "ui/gfx/native_widget_types.h"
namespace extensions {
namespace {
ScopedAllowNativeAppConnectionForTest* g_allow_native_app_connection_for_test =
nullptr;
constexpr base::TimeDelta kNativeMessagingHostErrorTimeout = base::Seconds(10);
ScopedNativeMessagingErrorTimeoutOverrideForTest*
g_native_messaging_host_timeout_override = nullptr;
// A self-owning class responsible for starting a native messaging host with
// command-line parameters reporting an error, keeping Chrome alive until the
// host terminates, or a timeout is reached.
//
// This lives on the IO thread, but its public factory static method should be
// called on the UI thread.
class NativeMessagingHostErrorReporter : public NativeMessageHost::Client {
public:
using MovableScopedKeepAlive =
std::unique_ptr<ScopedKeepAlive,
content::BrowserThread::DeleteOnUIThread>;
NativeMessagingHostErrorReporter(const NativeMessagingHostErrorReporter&) =
delete;
NativeMessagingHostErrorReporter& operator=(
const NativeMessagingHostErrorReporter&) = delete;
static void Report(const ExtensionId& extension_id,
const std::string& host_id,
const std::string& connection_id,
Profile* profile,
const std::string& error_arg) {
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
std::unique_ptr<NativeMessageHost> host =
NativeMessageProcessHost::CreateWithLauncher(
extension_id, host_id,
NativeProcessLauncher::CreateDefault(
/* allow_user_level_hosts= */ true,
/* native_view= */ gfx::NativeView(), profile->GetPath(),
/* require_native_initiated_connections= */ false,
connection_id, error_arg, profile));
MovableScopedKeepAlive keep_alive(
new ScopedKeepAlive(KeepAliveOrigin::NATIVE_MESSAGING_HOST_ERROR_REPORT,
KeepAliveRestartOption::DISABLED));
content::GetIOThreadTaskRunner({})->PostTask(
FROM_HERE,
base::BindOnce(&NativeMessagingHostErrorReporter::ReportOnIoThread,
std::move(host), std::move(keep_alive)));
}
private:
static void ReportOnIoThread(std::unique_ptr<NativeMessageHost> process,
MovableScopedKeepAlive keep_alive) {
new NativeMessagingHostErrorReporter(std::move(process),
std::move(keep_alive));
}
NativeMessagingHostErrorReporter(std::unique_ptr<NativeMessageHost> process,
MovableScopedKeepAlive keep_alive)
: keep_alive_(std::move(keep_alive)), process_(std::move(process)) {
DCHECK_CURRENTLY_ON(content::BrowserThread::IO);
timeout_.Start(
FROM_HERE,
g_native_messaging_host_timeout_override
? g_native_messaging_host_timeout_override->timeout()
: kNativeMessagingHostErrorTimeout,
base::BindOnce(&base::DeletePointer<NativeMessagingHostErrorReporter>,
base::Unretained(this)));
process_->Start(this);
}
private:
// NativeMessageHost::Client:
void PostMessageFromNativeHost(const std::string& message) override {}
void CloseChannel(const std::string& error_message) override {
DCHECK_CURRENTLY_ON(content::BrowserThread::IO);
timeout_.Stop();
base::SequencedTaskRunner::GetCurrentDefault()->DeleteSoon(FROM_HERE, this);
}
MovableScopedKeepAlive keep_alive_;
std::unique_ptr<NativeMessageHost> process_;
base::OneShotTimer timeout_;
};
} // namespace
bool ExtensionSupportsConnectionFromNativeApp(const ExtensionId& extension_id,
const std::string& host_id,
Profile* profile,
bool log_errors) {
if (g_allow_native_app_connection_for_test) {
return g_allow_native_app_connection_for_test->allow();
}
if (profile->IsOffTheRecord()) {
return false;
}
auto* extension =
ExtensionRegistry::Get(profile)->enabled_extensions().GetByID(
extension_id);
if (!extension) {
LOG_IF(ERROR, log_errors)
<< "Failed to launch native messaging connection: Unknown extension ID "
<< extension_id;
return false;
}
const auto* natively_connectable_hosts =
NativelyConnectableHosts::GetConnectableNativeMessageHosts(*extension);
if (!natively_connectable_hosts ||
!natively_connectable_hosts->count(host_id)) {
LOG_IF(ERROR, log_errors)
<< "Extension \"" << extension_id << "\" does not list \"" << host_id
<< "\" in its natively_connectable manifest field";
return false;
}
if (!extension->permissions_data()->active_permissions().HasAPIPermission(
"nativeMessaging")) {
LOG_IF(ERROR, log_errors)
<< "Extension \"" << extension_id
<< "\" does not have the \"nativeMessaging\" permission";
return false;
}
if (!extension->permissions_data()->active_permissions().HasAPIPermission(
"transientBackground")) {
LOG_IF(ERROR, log_errors)
<< "Extension \"" << extension_id
<< "\" does not have the \"transientBackground\" permission";
return false;
}
if (!EventRouter::Get(profile)->ExtensionHasEventListener(
extension_id, "runtime.onConnectNative")) {
LOG_IF(ERROR, log_errors)
<< "Failed to launch native messaging connection: Extension \""
<< extension_id << "\" is not listening for runtime.onConnectNative";
return false;
}
return true;
}
ScopedAllowNativeAppConnectionForTest::ScopedAllowNativeAppConnectionForTest(
bool allow)
: allow_(allow) {
DCHECK(!g_allow_native_app_connection_for_test);
g_allow_native_app_connection_for_test = this;
}
ScopedAllowNativeAppConnectionForTest::
~ScopedAllowNativeAppConnectionForTest() {
DCHECK_EQ(this, g_allow_native_app_connection_for_test);
g_allow_native_app_connection_for_test = nullptr;
}
ScopedNativeMessagingErrorTimeoutOverrideForTest::
ScopedNativeMessagingErrorTimeoutOverrideForTest(base::TimeDelta timeout)
: timeout_(timeout) {
DCHECK(!g_native_messaging_host_timeout_override);
g_native_messaging_host_timeout_override = this;
}
ScopedNativeMessagingErrorTimeoutOverrideForTest::
~ScopedNativeMessagingErrorTimeoutOverrideForTest() {
DCHECK_EQ(this, g_native_messaging_host_timeout_override);
g_native_messaging_host_timeout_override = nullptr;
}
bool IsValidConnectionId(std::string_view connection_id) {
return connection_id.size() <= 20 &&
base::ContainsOnlyChars(
connection_id,
"0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ-");
}
void LaunchNativeMessageHostFromNativeApp(const ExtensionId& extension_id,
const std::string& host_id,
const std::string& connection_id,
Profile* profile) {
if (!IsValidConnectionId(connection_id)) {
NativeMessagingHostErrorReporter::Report(extension_id, host_id,
/* connect_id = */ {}, profile,
"--invalid-connect-id");
return;
}
if (!ExtensionSupportsConnectionFromNativeApp(extension_id, host_id, profile,
/* log_errors = */ true)) {
NativeMessagingHostErrorReporter::Report(extension_id, host_id,
connection_id, profile,
"--extension-not-installed");
return;
}
const extensions::PortId port_id(
base::UnguessableToken::Create(), 1 /* port_number */,
true /* is_opener */, extensions::mojom::SerializationFormat::kJson);
extensions::MessageService* const message_service =
extensions::MessageService::Get(profile);
// TODO(crbug.com/41461105): Apply policy for allow_user_level.
auto native_message_host = NativeMessageProcessHost::CreateWithLauncher(
extension_id, host_id,
NativeProcessLauncher::CreateDefault(
/* allow_user_level_hosts= */ true,
/* native_view= */ gfx::NativeView(), profile->GetPath(),
/* require_native_initiated_connections= */ true, connection_id, "",
profile));
auto native_message_port = std::make_unique<extensions::NativeMessagePort>(
message_service->GetChannelDelegate(), port_id,
std::move(native_message_host));
message_service->OpenChannelToExtension(
extensions::ChannelEndpoint(profile), port_id,
extensions::MessagingEndpoint::ForNativeApp(host_id),
std::move(native_message_port), extension_id, GURL(),
mojom::ChannelType::kNative, std::string() /* channel_name */);
}
} // namespace extensions
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