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      1 // Copyright (c) 2012 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/recovery_component_installer.h"
      6 
      7 #include <stdint.h>
      8 #include <string>
      9 
     10 #include "base/base_paths.h"
     11 #include "base/bind.h"
     12 #include "base/command_line.h"
     13 #include "base/compiler_specific.h"
     14 #include "base/files/file_path.h"
     15 #include "base/files/file_util.h"
     16 #include "base/logging.h"
     17 #include "base/path_service.h"
     18 #include "base/prefs/pref_registry_simple.h"
     19 #include "base/prefs/pref_service.h"
     20 #include "base/process/launch.h"
     21 #include "base/strings/string_util.h"
     22 #include "base/values.h"
     23 #include "components/component_updater/component_updater_paths.h"
     24 #include "components/component_updater/component_updater_service.h"
     25 #include "components/component_updater/pref_names.h"
     26 #include "content/public/browser/browser_thread.h"
     27 
     28 using content::BrowserThread;
     29 
     30 namespace component_updater {
     31 
     32 namespace {
     33 
     34 // CRX hash. The extension id is: npdjjkjlcidkjlamlmmdelcjbcpdjocm.
     35 const uint8_t kSha2Hash[] = {0xdf, 0x39, 0x9a, 0x9b, 0x28, 0x3a, 0x9b, 0x0c,
     36                              0xbc, 0xc3, 0x4b, 0x29, 0x12, 0xf3, 0x9e, 0x2c,
     37                              0x19, 0x7a, 0x71, 0x4b, 0x0a, 0x7c, 0x80, 0x1c,
     38                              0xf6, 0x29, 0x7c, 0x0a, 0x5f, 0xea, 0x67, 0xb7};
     39 
     40 // File name of the recovery binary on different platforms.
     41 const base::FilePath::CharType kRecoveryFileName[] =
     42 #if defined(OS_WIN)
     43     FILE_PATH_LITERAL("ChromeRecovery.exe");
     44 #else  // OS_LINUX, OS_MACOSX, etc.
     45     FILE_PATH_LITERAL("ChromeRecovery");
     46 #endif
     47 
     48 const char kRecoveryManifestName[] = "ChromeRecovery";
     49 
     50 }  // namespace
     51 
     52 class RecoveryComponentInstaller : public ComponentInstaller {
     53  public:
     54   explicit RecoveryComponentInstaller(const Version& version,
     55                                       PrefService* prefs);
     56 
     57   virtual ~RecoveryComponentInstaller() {}
     58 
     59   virtual void OnUpdateError(int error) OVERRIDE;
     60 
     61   virtual bool Install(const base::DictionaryValue& manifest,
     62                        const base::FilePath& unpack_path) OVERRIDE;
     63 
     64   virtual bool GetInstalledFile(const std::string& file,
     65                                 base::FilePath* installed_file) OVERRIDE;
     66 
     67  private:
     68   Version current_version_;
     69   PrefService* prefs_;
     70 };
     71 
     72 void RecoveryRegisterHelper(ComponentUpdateService* cus, PrefService* prefs) {
     73   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
     74   Version version(prefs->GetString(prefs::kRecoveryComponentVersion));
     75   if (!version.IsValid()) {
     76     NOTREACHED();
     77     return;
     78   }
     79 
     80   CrxComponent recovery;
     81   recovery.name = "recovery";
     82   recovery.installer = new RecoveryComponentInstaller(version, prefs);
     83   recovery.version = version;
     84   recovery.pk_hash.assign(kSha2Hash, &kSha2Hash[sizeof(kSha2Hash)]);
     85   if (cus->RegisterComponent(recovery) != ComponentUpdateService::kOk) {
     86     NOTREACHED() << "Recovery component registration failed.";
     87   }
     88 }
     89 
     90 void RecoveryUpdateVersionHelper(const Version& version, PrefService* prefs) {
     91   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
     92   prefs->SetString(prefs::kRecoveryComponentVersion, version.GetString());
     93 }
     94 
     95 RecoveryComponentInstaller::RecoveryComponentInstaller(const Version& version,
     96                                                        PrefService* prefs)
     97     : current_version_(version), prefs_(prefs) {
     98   DCHECK(version.IsValid());
     99 }
    100 
    101 void RecoveryComponentInstaller::OnUpdateError(int error) {
    102   NOTREACHED() << "Recovery component update error: " << error;
    103 }
    104 
    105 bool RecoveryComponentInstaller::Install(const base::DictionaryValue& manifest,
    106                                          const base::FilePath& unpack_path) {
    107   std::string name;
    108   manifest.GetStringASCII("name", &name);
    109   if (name != kRecoveryManifestName)
    110     return false;
    111   std::string proposed_version;
    112   manifest.GetStringASCII("version", &proposed_version);
    113   Version version(proposed_version.c_str());
    114   if (!version.IsValid())
    115     return false;
    116   if (current_version_.CompareTo(version) >= 0)
    117     return false;
    118 
    119   // Passed the basic tests. Copy the installation to a permanent directory.
    120   base::FilePath path;
    121   if (!PathService::Get(DIR_RECOVERY_BASE, &path))
    122     return false;
    123   if (!base::PathExists(path)) {
    124     if (!base::CreateDirectory(path)) {
    125       return false;
    126     }
    127   }
    128   path = path.AppendASCII(version.GetString());
    129   if (base::PathExists(path) && !base::DeleteFile(path, true))
    130     return false;
    131   if (!base::Move(unpack_path, path)) {
    132     DVLOG(1) << "Recovery component move failed.";
    133     return false;
    134   }
    135 
    136   base::FilePath main_file = path.Append(kRecoveryFileName);
    137   if (!base::PathExists(main_file))
    138     return false;
    139   // Run the recovery component.
    140   CommandLine cmdline(main_file);
    141   std::string arguments;
    142   if (manifest.GetStringASCII("x-recovery-args", &arguments))
    143     cmdline.AppendArg(arguments);
    144   std::string add_version;
    145   if (manifest.GetStringASCII("x-recovery-add-version", &add_version)) {
    146     if (add_version == "yes")
    147       cmdline.AppendSwitchASCII("version", current_version_.GetString());
    148   }
    149   current_version_ = version;
    150   if (prefs_) {
    151     BrowserThread::PostTask(
    152         BrowserThread::UI,
    153         FROM_HERE,
    154         base::Bind(&RecoveryUpdateVersionHelper, version, prefs_));
    155   }
    156   return base::LaunchProcess(cmdline, base::LaunchOptions(), NULL);
    157 }
    158 
    159 bool RecoveryComponentInstaller::GetInstalledFile(
    160     const std::string& file,
    161     base::FilePath* installed_file) {
    162   return false;
    163 }
    164 
    165 void RegisterRecoveryComponent(ComponentUpdateService* cus,
    166                                PrefService* prefs) {
    167 #if !defined(OS_CHROMEOS)
    168   // We delay execute the registration because we are not required in
    169   // the critical path during browser startup.
    170   BrowserThread::PostDelayedTask(
    171       BrowserThread::UI,
    172       FROM_HERE,
    173       base::Bind(&RecoveryRegisterHelper, cus, prefs),
    174       base::TimeDelta::FromSeconds(6));
    175 #endif
    176 }
    177 
    178 void RegisterPrefsForRecoveryComponent(PrefRegistrySimple* registry) {
    179   registry->RegisterStringPref(prefs::kRecoveryComponentVersion, "0.0.0.0");
    180 }
    181 
    182 }  // namespace component_updater
    183