Certificate Transparency: Use component updater for EV whitelist

chrome/browser/component_updater/ev_whitelist_component_installer.cc

+// 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/file_util.h"
+#include "base/files/file_path.h"
+#include "base/lazy_instance.h"
+#include "base/logging.h"
+#include "base/path_service.h"
+#include "components/component_updater/component_updater_paths.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");
+}  // namespace
+
+namespace component_updater {
+
+// The SHA256 of the SubjectPublicKeyInfo used to sign the extension.
+// The extension id is: oafdbfcohdcjandcenmccfopbeklnicp
+const uint8 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() {
+}
+
+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();
+
+  // TODO(eranm): Uncomment once https://codereview.chromium.org/462543002/
+  // is in.
+  /*
+  const base::FilePath whitelist_file = GetInstalledPath(path);
+  base::Callback<void(void)> set_cb =
+      base::Bind(&net::ct::SetEVWhitelistFromFile, whitelist_file);
+  content::BrowserThread::PostBlockingPoolTask(
+      FROM_HERE,
+      set_cb);
+      */
+}
+
+bool EVWhitelistComponentInstallerTraits::VerifyInstallation(
+    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.size() > 0;

[Sorin Jianu, 2014/08/12 00:37:52]

Consider return !compressed_whitelist.empty()?

empty() is the idiomatic way to test for the no items condition.

[Eran Messeri, 2014/08/12 09:52:07]

Done.

+}
+
+base::FilePath EVWhitelistComponentInstallerTraits::GetBaseDirectory() const {
+  base::FilePath result;
+  PathService::Get(DIR_COMPONENT_EV_WHITELIST, &result);
+  return result;
+}
+
+void EVWhitelistComponentInstallerTraits::GetHash(
+    std::vector<uint8>* hash) const {
+  hash->assign(kPublicKeySHA256,
+               kPublicKeySHA256 + arraysize(kPublicKeySHA256));
+}
+
+std::string EVWhitelistComponentInstallerTraits::GetName() const {
+  return kEVWhitelistManifestName;
+}
+
+void RegisterEVWhitelistComponent(ComponentUpdateService* cus) {
+  VLOG(1) << "Registering EV whitelist component.";
+
+  scoped_ptr<ComponentInstallerTraits> traits(
+      new EVWhitelistComponentInstallerTraits());
+  // |cus| will take ownership of |installer| during installer->Register(cus).
+  DefaultComponentInstaller* installer =
+      new DefaultComponentInstaller(traits.Pass());
+  installer->Register(cus);
+}
+
+}  // namespace component_updater