recovery_component_installer.cc revision e4256316f8b5e8d1ec0df1f7762771622a53fa63 
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
28using content::BrowserThread;
29
30namespace component_updater {
31
32namespace {
33
34// CRX hash. The extension id is: npdjjkjlcidkjlamlmmdelcjbcpdjocm.
35const 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.
41const 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
48const char kRecoveryManifestName[] = "ChromeRecovery";
49
50}  // namespace
51
52class 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
72void 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
90void RecoveryUpdateVersionHelper(const Version& version, PrefService* prefs) {
91  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
92  prefs->SetString(prefs::kRecoveryComponentVersion, version.GetString());
93}
94
95RecoveryComponentInstaller::RecoveryComponentInstaller(const Version& version,
96                                                       PrefService* prefs)
97    : current_version_(version), prefs_(prefs) {
98  DCHECK(version.IsValid());
99}
100
101void RecoveryComponentInstaller::OnUpdateError(int error) {
102  NOTREACHED() << "Recovery component update error: " << error;
103}
104
105bool 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
159bool RecoveryComponentInstaller::GetInstalledFile(
160    const std::string& file,
161    base::FilePath* installed_file) {
162  return false;
163}
164
165void 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
178void RegisterPrefsForRecoveryComponent(PrefRegistrySimple* registry) {
179  registry->RegisterStringPref(prefs::kRecoveryComponentVersion, "0.0.0.0");
180}
181
182}  // namespace component_updater
183