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// Copyright 2014 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 "chrome/browser/component_updater/ev_whitelist_component_installer.h"
#include <string>
#include <vector>
#include "base/bind.h"
#include "base/files/file_path.h"
#include "base/files/file_util.h"
#include "base/lazy_instance.h"
#include "base/logging.h"
#include "base/numerics/safe_conversions.h"
#include "base/path_service.h"
#include "base/version.h"
#include "components/component_updater/component_updater_paths.h"
#include "components/packed_ct_ev_whitelist/packed_ct_ev_whitelist.h"
#include "content/public/browser/browser_thread.h"
#include "net/ssl/ssl_config_service.h"
using component_updater::ComponentUpdateService;
namespace {
const base::FilePath::CharType kCompressedEVWhitelistFileName[] =
FILE_PATH_LITERAL("ev_hashes_whitelist.bin");
base::FilePath GetEVWhitelistFilePath(const base::FilePath& base_path) {
return base_path.Append(kCompressedEVWhitelistFileName);
}
void UpdateNewWhitelistData(const base::FilePath& new_whitelist_file,
const base::FilePath& stored_whitelist_path,
const base::Version& version) {
VLOG(1) << "Reading new EV whitelist from file: "
<< new_whitelist_file.value();
std::string compressed_list;
if (!base::ReadFileToString(new_whitelist_file, &compressed_list)) {
VLOG(1) << "Failed reading from " << new_whitelist_file.value();
return;
}
scoped_refptr<net::ct::EVCertsWhitelist> new_whitelist(
new packed_ct_ev_whitelist::PackedEVCertsWhitelist(compressed_list,
version));
if (!new_whitelist->IsValid()) {
VLOG(1) << "Failed uncompressing EV certs whitelist.";
return;
}
if (base::IsValueInRangeForNumericType<int>(compressed_list.size())) {
const int list_size = base::checked_cast<int>(compressed_list.size());
if (base::WriteFile(stored_whitelist_path, compressed_list.data(),
list_size) != list_size) {
LOG(WARNING) << "Failed to save new EV whitelist to file.";
}
}
packed_ct_ev_whitelist::SetEVCertsWhitelist(new_whitelist);
}
void DoInitialLoadFromDisk(const base::FilePath& stored_whitelist_path) {
if (stored_whitelist_path.empty()) {
return;
}
VLOG(1) << "Initial load: reading EV whitelist from file: "
<< stored_whitelist_path.value();
std::string compressed_list;
if (!base::ReadFileToString(stored_whitelist_path, &compressed_list)) {
VLOG(1) << "Failed reading from " << stored_whitelist_path.value();
return;
}
// The version number is unknown as the list is loaded from disk, not
// the component.
// In practice very quickly the component updater will call ComponentReady
// which will have a valid version.
scoped_refptr<net::ct::EVCertsWhitelist> new_whitelist(
new packed_ct_ev_whitelist::PackedEVCertsWhitelist(compressed_list,
Version()));
if (!new_whitelist->IsValid()) {
VLOG(1) << "Failed uncompressing EV certs whitelist.";
return;
}
VLOG(1) << "EV whitelist: Sucessfully loaded initial data.";
packed_ct_ev_whitelist::SetEVCertsWhitelist(new_whitelist);
}
} // namespace
namespace component_updater {
// The SHA256 of the SubjectPublicKeyInfo used to sign the extension.
// The extension id is: oafdbfcohdcjandcenmccfopbeklnicp
const uint8_t kPublicKeySHA256[32] = {
0xe0, 0x53, 0x15, 0x2e, 0x73, 0x29, 0x0d, 0x32, 0x4d, 0xc2, 0x25,
0xef, 0x14, 0xab, 0xd8, 0x2f, 0x84, 0xf5, 0x85, 0x9e, 0xc0, 0xfa,
0x94, 0xbc, 0x99, 0xc9, 0x5a, 0x27, 0x55, 0x19, 0x83, 0xef};
const char kEVWhitelistManifestName[] = "EV Certs CT whitelist";
EVWhitelistComponentInstallerTraits::EVWhitelistComponentInstallerTraits(
const base::FilePath& base_path)
: ev_whitelist_path_(GetEVWhitelistFilePath(base_path)) {
}
bool EVWhitelistComponentInstallerTraits::CanAutoUpdate() const {
return true;
}
bool EVWhitelistComponentInstallerTraits::OnCustomInstall(
const base::DictionaryValue& manifest,
const base::FilePath& install_dir) {
VLOG(1) << "Entering EVWhitelistComponentInstallerTraits::OnCustomInstall.";
return true; // Nothing custom here.
}
base::FilePath EVWhitelistComponentInstallerTraits::GetInstalledPath(
const base::FilePath& base) {
// EV whitelist is encoded the same way for all platforms
return base.Append(FILE_PATH_LITERAL("_platform_specific"))
.Append(FILE_PATH_LITERAL("all"))
.Append(kCompressedEVWhitelistFileName);
}
void EVWhitelistComponentInstallerTraits::ComponentReady(
const base::Version& version,
const base::FilePath& path,
scoped_ptr<base::DictionaryValue> manifest) {
VLOG(1) << "Component ready, version " << version.GetString() << " in "
<< path.value();
const base::FilePath whitelist_file = GetInstalledPath(path);
content::BrowserThread::PostBlockingPoolTask(
FROM_HERE, base::Bind(&UpdateNewWhitelistData, whitelist_file,
ev_whitelist_path_, version));
}
bool EVWhitelistComponentInstallerTraits::VerifyInstallation(
const base::DictionaryValue& manifest,
const base::FilePath& install_dir) const {
const base::FilePath expected_file = GetInstalledPath(install_dir);
VLOG(1) << "Verifying install: " << expected_file.value();
if (!base::PathExists(expected_file)) {
VLOG(1) << "File missing.";
return false;
}
std::string compressed_whitelist;
if (!base::ReadFileToString(expected_file, &compressed_whitelist)) {
VLOG(1) << "Failed reading the compressed EV hashes whitelist.";
return false;
}
VLOG(1) << "Whitelist size: " << compressed_whitelist.size();
return !compressed_whitelist.empty();
}
base::FilePath EVWhitelistComponentInstallerTraits::GetBaseDirectory() const {
base::FilePath result;
PathService::Get(DIR_COMPONENT_EV_WHITELIST, &result);
return result;
}
void EVWhitelistComponentInstallerTraits::GetHash(
std::vector<uint8_t>* hash) const {
hash->assign(kPublicKeySHA256,
kPublicKeySHA256 + arraysize(kPublicKeySHA256));
}
std::string EVWhitelistComponentInstallerTraits::GetName() const {
return kEVWhitelistManifestName;
}
void RegisterEVWhitelistComponent(ComponentUpdateService* cus,
const base::FilePath& path) {
VLOG(1) << "Registering EV whitelist component.";
scoped_ptr<ComponentInstallerTraits> traits(
new EVWhitelistComponentInstallerTraits(path));
// |cus| will take ownership of |installer| during installer->Register(cus).
DefaultComponentInstaller* installer =
new DefaultComponentInstaller(traits.Pass());
installer->Register(cus);
if (!content::BrowserThread::PostBlockingPoolTask(
FROM_HERE,
base::Bind(&DoInitialLoadFromDisk, GetEVWhitelistFilePath(path)))) {
NOTREACHED();
}
}
} // namespace component_updater
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