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// Copyright 2024 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/component_updater/iwa_key_distribution_component_installer.h"
#include <cstdint>
#include <memory>
#include <utility>
#include <vector>
#include "base/check_deref.h"
#include "base/command_line.h"
#include "base/feature_list.h"
#include "base/files/file_path.h"
#include "base/files/file_util.h"
#include "base/functional/bind.h"
#include "base/functional/callback.h"
#include "base/functional/callback_helpers.h"
#include "base/logging.h"
#include "base/memory/scoped_refptr.h"
#include "base/task/task_traits.h"
#include "base/types/cxx23_to_underlying.h"
#include "base/values.h"
#include "base/version.h"
#include "chrome/browser/browser_process.h"
#include "chrome/common/chrome_paths.h"
#include "chrome/common/chrome_switches.h"
#include "components/component_updater/component_installer.h"
#include "components/component_updater/component_updater_service.h"
#include "components/crx_file/id_util.h"
#include "components/update_client/update_client.h"
#include "components/webapps/isolated_web_apps/iwa_key_distribution_info_provider.h"
#if BUILDFLAG(IS_WIN)
#include "content/public/common/content_features.h"
#endif // BUILDFLAG(IS_WIN)
namespace {
// The SHA256 of the SubjectPublicKeyInfo used to sign the extension.
// The extension id is: iebhnlpddlcpcfpfalldikcoeakpeoah
constexpr std::array<uint8_t, 32> kIwaKeyDistributionPublicKeySHA256 = {
0x84, 0x17, 0xdb, 0xf3, 0x3b, 0x2f, 0x25, 0xf5, 0x0b, 0xb3, 0x8a,
0x2e, 0x40, 0xaf, 0x4e, 0x07, 0x18, 0xfa, 0xae, 0x6e, 0x0e, 0xdb,
0x46, 0xfc, 0xc9, 0x36, 0x50, 0xcf, 0x38, 0xfa, 0xf9, 0xab};
constexpr std::string_view kPreloadedKey = "is_preloaded";
constexpr std::string_view kIwaKdcExpCohortAttribute = "_iwa_kdc_exp_cohort";
void OnDemandUpdateCompleted(update_client::Error err) {
VLOG(1) << "On-demand update for the "
"Iwa Key Distribution Component "
"finished with result "
<< base::to_underlying(err);
}
component_updater::OnDemandUpdater::Priority GetOnDemandUpdatePriority() {
#if BUILDFLAG(IS_WIN)
return component_updater::OnDemandUpdater::Priority::FOREGROUND;
#else
return component_updater::OnDemandUpdater::Priority::BACKGROUND;
#endif
}
bool IsOnDemandUpdateSupported() {
// `switches::kDisableComponentUpdate` is set by default in
// browsertests.
return component_updater::IwaKeyDistributionComponentInstallerPolicy::
IsSupported() &&
!base::CommandLine::ForCurrentProcess()->HasSwitch(
switches::kDisableComponentUpdate) &&
g_browser_process && g_browser_process->component_updater();
}
} // namespace
namespace component_updater {
#if BUILDFLAG(IS_CHROMEOS) || BUILDFLAG(IS_MAC) || BUILDFLAG(IS_LINUX)
BASE_FEATURE(kIwaKeyDistributionComponent,
"IwaKeyDistributionComponent",
#if BUILDFLAG(IS_CHROMEOS)
base::FEATURE_ENABLED_BY_DEFAULT
#else // !BUILDFLAG(IS_CHROMEOS)
base::FEATURE_DISABLED_BY_DEFAULT
#endif // !BUILDFLAG(IS_CHROMEOS)
);
#endif // BUILDFLAG(IS_CHROMEOS) || BUILDFLAG(IS_MAC) || BUILDFLAG(IS_LINUX)
IwaKeyDistributionComponentInstallerPolicy::
IwaKeyDistributionComponentInstallerPolicy() = default;
IwaKeyDistributionComponentInstallerPolicy::
~IwaKeyDistributionComponentInstallerPolicy() = default;
// static
bool IwaKeyDistributionComponentInstallerPolicy::IsSupported() {
// kIwaKeyDistributionComponent feature flag is somewhat useless without
// features::kIsolatedWebApps. On ChromeOS, it's kept separately for the time
// being as a kill switch and will be retired shortly; on Mac/Linux, the
// component logic is not fully supported, so it has to be kept separated from
// the main IWA feature.
#if BUILDFLAG(IS_WIN)
return base::FeatureList::IsEnabled(features::kIsolatedWebApps);
#elif BUILDFLAG(IS_CHROMEOS) || BUILDFLAG(IS_MAC) || BUILDFLAG(IS_LINUX)
return base::FeatureList::IsEnabled(kIwaKeyDistributionComponent);
#else
return false;
#endif
}
// static
bool IwaKeyDistributionComponentInstallerPolicy::QueueOnDemandUpdate(
base::PassKey<web_app::IwaKeyDistributionInfoProvider>) {
// static
if (!g_browser_process || !IsSupported()) {
return false;
}
VLOG(1) << "Queueing on-demand update for the Iwa Key Distribution Component";
g_browser_process->component_updater()->GetOnDemandUpdater().OnDemandUpdate(
crx_file::id_util::GenerateIdFromHash(kIwaKeyDistributionPublicKeySHA256),
GetOnDemandUpdatePriority(), base::BindOnce(&OnDemandUpdateCompleted));
return true;
}
bool IwaKeyDistributionComponentInstallerPolicy::VerifyInstallation(
const base::Value::Dict& manifest,
const base::FilePath& install_dir) const {
return base::PathExists(install_dir.Append(kDataFileName));
}
bool IwaKeyDistributionComponentInstallerPolicy::
SupportsGroupPolicyEnabledComponentUpdates() const {
return true;
}
bool IwaKeyDistributionComponentInstallerPolicy::RequiresNetworkEncryption()
const {
return false;
}
update_client::CrxInstaller::Result
IwaKeyDistributionComponentInstallerPolicy::OnCustomInstall(
const base::Value::Dict& manifest,
const base::FilePath& install_dir) {
// No custom install.
return update_client::CrxInstaller::Result(0);
}
void IwaKeyDistributionComponentInstallerPolicy::OnCustomUninstall() {}
void IwaKeyDistributionComponentInstallerPolicy::ComponentReady(
const base::Version& version,
const base::FilePath& install_dir,
base::Value::Dict manifest) {
if (install_dir.empty() || !version.IsValid()) {
return;
}
VLOG(1) << "Iwa Key Distribution Component ready, version " << version
<< " in " << install_dir;
web_app::IwaKeyDistributionInfoProvider& info_provider =
web_app::IwaKeyDistributionInfoProvider::GetInstance();
info_provider.LoadKeyDistributionData(
version, install_dir.Append(kDataFileName),
/*is_preloaded=*/manifest.FindBool(kPreloadedKey).value_or(false));
}
base::FilePath
IwaKeyDistributionComponentInstallerPolicy::GetRelativeInstallDir() const {
return base::FilePath(kRelativeInstallDirName);
}
void IwaKeyDistributionComponentInstallerPolicy::GetHash(
std::vector<uint8_t>* hash) const {
hash->assign(std::begin(kIwaKeyDistributionPublicKeySHA256),
std::end(kIwaKeyDistributionPublicKeySHA256));
}
std::string IwaKeyDistributionComponentInstallerPolicy::GetName() const {
return kManifestName;
}
update_client::InstallerAttributes
IwaKeyDistributionComponentInstallerPolicy::GetInstallerAttributes() const {
update_client::InstallerAttributes attributes;
if (base::CommandLine::ForCurrentProcess()->HasSwitch(
kIwaKeyDistributionComponentExpCohort)) {
attributes.emplace(
kIwaKdcExpCohortAttribute,
base::CommandLine::ForCurrentProcess()->GetSwitchValueASCII(
kIwaKeyDistributionComponentExpCohort));
}
return attributes;
}
void RegisterIwaKeyDistributionComponent(ComponentUpdateService* cus) {
if (!IwaKeyDistributionComponentInstallerPolicy::IsSupported()) {
return;
}
// `RegisterIwaKeyDistributionComponent` is effectively called before the user
// profile is created. Hence we can avoid eventual initialization race
// conditions for user sessions.
web_app::IwaKeyDistributionInfoProvider::GetInstance().SetUp(
IsOnDemandUpdateSupported(),
base::BindRepeating(
&IwaKeyDistributionComponentInstallerPolicy::QueueOnDemandUpdate));
base::MakeRefCounted<ComponentInstaller>(
std::make_unique<IwaKeyDistributionComponentInstallerPolicy>())
->Register(cus, base::DoNothing());
}
} // namespace component_updater
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