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      1 // Copyright 2014 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #include "chrome/browser/component_updater/cld_component_installer.h"
      6 
      7 #include <string>
      8 #include <vector>
      9 
     10 #include "base/bind.h"
     11 #include "base/file_util.h"
     12 #include "base/files/file_path.h"
     13 #include "base/lazy_instance.h"
     14 #include "base/logging.h"
     15 #include "base/path_service.h"
     16 #include "base/platform_file.h"
     17 #include "chrome/browser/profiles/profile.h"
     18 #include "chrome/common/chrome_constants.h"
     19 #include "chrome/common/chrome_paths.h"
     20 #include "content/public/browser/browser_thread.h"
     21 #include "net/ssl/ssl_config_service.h"
     22 
     23 using component_updater::ComponentUpdateService;
     24 using content::BrowserThread;
     25 
     26 namespace {
     27 
     28 // Once we have acquired a valid file from the component installer, we need to
     29 // make the path available to other parts of the system such as the
     30 // translation libraries. We create a global to hold onto the path, and a
     31 // lock to guard it. See GetLatestCldDataFile(...) for more info.
     32 base::LazyInstance<base::Lock> cld_file_lock = LAZY_INSTANCE_INITIALIZER;
     33 base::LazyInstance<base::FilePath> cld_file = LAZY_INSTANCE_INITIALIZER;
     34 
     35 }
     36 
     37 namespace component_updater {
     38 
     39 // The SHA256 of the SubjectPublicKeyInfo used to sign the extension.
     40 // The extension id is: dpedmmgabcgnikllifiidmijgoiihfgf
     41 const uint8 kPublicKeySHA256[32] = {
     42     0x3f, 0x43, 0xcc, 0x60, 0x12, 0x6d, 0x8a, 0xbb,
     43     0x85, 0x88, 0x3c, 0x89, 0x6e, 0x88, 0x75, 0x65,
     44     0xb9, 0x46, 0x09, 0xe8, 0xca, 0x92, 0xdd, 0x82,
     45     0x4e, 0x6d, 0x0e, 0xe6, 0x79, 0x8a, 0x87, 0xf5
     46 };
     47 
     48 const char kCldManifestName[] = "CLD2 Data";
     49 
     50 CldComponentInstallerTraits::CldComponentInstallerTraits() {
     51 }
     52 
     53 bool CldComponentInstallerTraits::CanAutoUpdate() const {
     54   return true;
     55 }
     56 
     57 bool CldComponentInstallerTraits::OnCustomInstall(
     58     const base::DictionaryValue& manifest,
     59     const base::FilePath& install_dir) {
     60   return true;  // Nothing custom here.
     61 }
     62 
     63 base::FilePath CldComponentInstallerTraits::GetInstalledPath(
     64     const base::FilePath& base) {
     65   // Currently, all platforms have the file at the same location because there
     66   // is no binary difference in the generated file on any supported platform.
     67   // NB: This may change when 64-bit is officially supported.
     68   return base.Append(FILE_PATH_LITERAL("_platform_specific"))
     69       .Append(FILE_PATH_LITERAL("all"))
     70       .Append(chrome::kCLDDataFilename);
     71 }
     72 
     73 void CldComponentInstallerTraits::ComponentReady(
     74     const base::Version& version,
     75     const base::FilePath& path,
     76     scoped_ptr<base::DictionaryValue> manifest) {
     77   VLOG(1) << "Component ready, version " << version.GetString() << " in "
     78           << path.value();
     79   SetLatestCldDataFile(GetInstalledPath(path));
     80 }
     81 
     82 bool CldComponentInstallerTraits::VerifyInstallation(
     83     const base::FilePath& install_dir) const {
     84   // We can't really do much to verify the CLD2 data file. In theory we could
     85   // read the headers, but that won't do much other than tell us whether or
     86   // not the headers are valid. So just check if the file exists.
     87   const base::FilePath expected_file = GetInstalledPath(install_dir);
     88   VLOG(1) << "Verifying install: " << expected_file.value();
     89   const bool result = base::PathExists(expected_file);
     90   VLOG(1) << "Verification result: " << (result ? "valid" : "invalid");
     91   return result;
     92 }
     93 
     94 base::FilePath CldComponentInstallerTraits::GetBaseDirectory() const {
     95   base::FilePath result;
     96   PathService::Get(chrome::DIR_COMPONENT_CLD2, &result);
     97   return result;
     98 }
     99 
    100 void CldComponentInstallerTraits::GetHash(std::vector<uint8>* hash) const {
    101   hash->assign(kPublicKeySHA256,
    102                kPublicKeySHA256 + arraysize(kPublicKeySHA256));
    103 }
    104 
    105 std::string CldComponentInstallerTraits::GetName() const {
    106   return kCldManifestName;
    107 }
    108 
    109 void RegisterCldComponent(ComponentUpdateService* cus) {
    110   scoped_ptr<ComponentInstallerTraits> traits(
    111       new CldComponentInstallerTraits());
    112   // |cus| will take ownership of |installer| during installer->Register(cus).
    113   DefaultComponentInstaller* installer =
    114       new DefaultComponentInstaller(traits.Pass());
    115   installer->Register(cus);
    116 }
    117 
    118 void CldComponentInstallerTraits::SetLatestCldDataFile(
    119     const base::FilePath& path) {
    120   VLOG(1) << "Setting CLD data file location: " << path.value();
    121   base::AutoLock lock(cld_file_lock.Get());
    122   cld_file.Get() = path;
    123 }
    124 
    125 base::FilePath GetLatestCldDataFile() {
    126   base::AutoLock lock(cld_file_lock.Get());
    127   // cld_file is an empty path by default, meaning "file not available yet".
    128   return cld_file.Get();
    129 }
    130 
    131 }  // namespace component_updater
    132