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// Copyright 2017 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/ssl_error_assistant_component_installer.h"
#include <memory>
#include <utility>
#include "base/files/file_util.h"
#include "base/functional/bind.h"
#include "base/functional/callback.h"
#include "base/logging.h"
#include "base/memory/ref_counted.h"
#include "base/task/thread_pool.h"
#include "components/security_interstitials/content/ssl_error_assistant.h"
#include "components/security_interstitials/content/ssl_error_handler.h"
#include "content/public/browser/browser_task_traits.h"
#include "content/public/browser/browser_thread.h"
namespace {
const base::FilePath::CharType kConfigBinaryPbFileName[] =
FILE_PATH_LITERAL("ssl_error_assistant.pb");
// The SHA256 of the SubjectPublicKeyInfo used to sign the extension.
// The extension id is: giekcmmlnklenlaomppkphknjmnnpneh
const uint8_t kSslErrorAssistantPublicKeySHA256[32] = {
0x68, 0x4a, 0x2c, 0xcb, 0xda, 0xb4, 0xdb, 0x0e, 0xcf, 0xfa, 0xf7,
0xad, 0x9c, 0xdd, 0xfd, 0x47, 0x97, 0xe4, 0x73, 0x24, 0x67, 0x93,
0x9c, 0xb1, 0x14, 0xcd, 0x3f, 0x54, 0x66, 0x25, 0x99, 0x3f};
void LoadProtoFromDisk(const base::FilePath& pb_path) {
if (pb_path.empty()) {
return;
}
std::string binary_pb;
if (!base::ReadFileToString(pb_path, &binary_pb)) {
// The file won't exist on new installations, so this is not always an
// error.
DVLOG(1) << "Failed reading from " << pb_path.value();
return;
}
auto proto = std::make_unique<chrome_browser_ssl::SSLErrorAssistantConfig>();
if (!proto->ParseFromString(binary_pb)) {
DVLOG(1) << "Failed parsing proto " << pb_path.value();
return;
}
// Retrieve the default proto from the resource bundle and keep the most
// recent version. This is required since the component updater may still have
// an older version.
std::unique_ptr<chrome_browser_ssl::SSLErrorAssistantConfig> default_proto =
SSLErrorAssistant::GetErrorAssistantProtoFromResourceBundle();
if (default_proto && default_proto->version_id() > proto->version_id()) {
proto = std::move(default_proto);
}
content::GetUIThreadTaskRunner({})->PostTask(
FROM_HERE, base::BindOnce(&SSLErrorHandler::SetErrorAssistantProto,
std::move(proto)));
}
} // namespace
namespace component_updater {
bool SSLErrorAssistantComponentInstallerPolicy::
SupportsGroupPolicyEnabledComponentUpdates() const {
return true;
}
bool SSLErrorAssistantComponentInstallerPolicy::RequiresNetworkEncryption()
const {
return false;
}
update_client::CrxInstaller::Result
SSLErrorAssistantComponentInstallerPolicy::OnCustomInstall(
const base::Value::Dict& manifest,
const base::FilePath& install_dir) {
return update_client::CrxInstaller::Result(0); // Nothing custom here.
}
void SSLErrorAssistantComponentInstallerPolicy::OnCustomUninstall() {}
base::FilePath SSLErrorAssistantComponentInstallerPolicy::GetInstalledPath(
const base::FilePath& base) {
return base.Append(kConfigBinaryPbFileName);
}
void SSLErrorAssistantComponentInstallerPolicy::ComponentReady(
const base::Version& version,
const base::FilePath& install_dir,
base::Value::Dict manifest) {
DVLOG(1) << "Component ready, version " << version.GetString() << " in "
<< install_dir.value();
base::ThreadPool::PostTask(
FROM_HERE, {base::MayBlock(), base::TaskPriority::BEST_EFFORT},
base::BindOnce(&LoadProtoFromDisk, GetInstalledPath(install_dir)));
}
// Called during startup and installation before ComponentReady().
bool SSLErrorAssistantComponentInstallerPolicy::VerifyInstallation(
const base::Value::Dict& manifest,
const base::FilePath& install_dir) const {
// No need to actually validate the proto here, since we'll do the checking
// in PopulateFromDynamicUpdate().
return base::PathExists(GetInstalledPath(install_dir));
}
base::FilePath
SSLErrorAssistantComponentInstallerPolicy::GetRelativeInstallDir() const {
return base::FilePath(FILE_PATH_LITERAL("SSLErrorAssistant"));
}
void SSLErrorAssistantComponentInstallerPolicy::GetHash(
std::vector<uint8_t>* hash) const {
hash->assign(std::begin(kSslErrorAssistantPublicKeySHA256),
std::end(kSslErrorAssistantPublicKeySHA256));
}
std::string SSLErrorAssistantComponentInstallerPolicy::GetName() const {
// This is a user visible string, so using something other than SSL and TLS.
return "Certificate Error Assistant";
}
update_client::InstallerAttributes
SSLErrorAssistantComponentInstallerPolicy::GetInstallerAttributes() const {
return update_client::InstallerAttributes();
}
void RegisterSSLErrorAssistantComponent(ComponentUpdateService* cus) {
DVLOG(1) << "Registering SSL Error Assistant component.";
auto installer = base::MakeRefCounted<ComponentInstaller>(
std::make_unique<SSLErrorAssistantComponentInstallerPolicy>());
installer->Register(cus, base::OnceClosure());
}
} // namespace component_updater
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