chrome/browser/chromeos/app_mode/kiosk_profile_loader.cc

   1 // Copyright 2013 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/chromeos/app_mode/kiosk_profile_loader.h"
   6
   7 #include "base/logging.h"
   8 #include "base/memory/weak_ptr.h"
   9 #include "base/message_loop/message_loop.h"
  10 #include "base/strings/string_util.h"
  11 #include "base/sys_info.h"
  12 #include "chrome/browser/chromeos/app_mode/kiosk_app_manager.h"
  13 #include "chrome/browser/chromeos/login/auth/login_status_consumer.h"
  14 #include "chrome/browser/chromeos/login/auth/user_context.h"
  15 #include "chrome/browser/chromeos/login/demo_mode/demo_app_launcher.h"
  16 #include "chrome/browser/chromeos/login/login_utils.h"
  17 #include "chrome/browser/chromeos/login/ui/login_display_host_impl.h"
  18 #include "chrome/browser/chromeos/login/users/user_manager.h"
  19 #include "chrome/browser/chromeos/settings/cros_settings.h"
  20 #include "chrome/browser/lifetime/application_lifetime.h"
  21 #include "chromeos/cryptohome/async_method_caller.h"
  22 #include "chromeos/dbus/cryptohome_client.h"
  23 #include "chromeos/dbus/dbus_thread_manager.h"
  24 #include "content/public/browser/browser_thread.h"
  25 #include "google_apis/gaia/gaia_auth_util.h"
  26
  27 using content::BrowserThread;
  28
  29 namespace chromeos {
  30
  31 namespace {
  32
  33 KioskAppLaunchError::Error LoginFailureToKioskAppLaunchError(
  34     const LoginFailure& error) {
  35   switch (error.reason()) {
  36     case LoginFailure::COULD_NOT_MOUNT_TMPFS:
  37     case LoginFailure::COULD_NOT_MOUNT_CRYPTOHOME:
  38       return KioskAppLaunchError::UNABLE_TO_MOUNT;
  39     case LoginFailure::DATA_REMOVAL_FAILED:
  40       return KioskAppLaunchError::UNABLE_TO_REMOVE;
  41     case LoginFailure::USERNAME_HASH_FAILED:
  42       return KioskAppLaunchError::UNABLE_TO_RETRIEVE_HASH;
  43     default:
  44       NOTREACHED();
  45       return KioskAppLaunchError::UNABLE_TO_MOUNT;
  46   }
  47 }
  48
  49 }  // namespace
  50
  51 ////////////////////////////////////////////////////////////////////////////////
  52 // KioskProfileLoader::CryptohomedChecker ensures cryptohome daemon is up
  53 // and running by issuing an IsMounted call. If the call does not go through
  54 // and chromeos::DBUS_METHOD_CALL_SUCCESS is not returned, it will retry after
  55 // some time out and at the maximum five times before it gives up. Upon
  56 // success, it resumes the launch by logging in as a kiosk mode account.
  57
  58 class KioskProfileLoader::CryptohomedChecker
  59     : public base::SupportsWeakPtr<CryptohomedChecker> {
  60  public:
  61   explicit CryptohomedChecker(KioskProfileLoader* loader)
  62       : loader_(loader),
  63         retry_count_(0) {
  64   }
  65   ~CryptohomedChecker() {}
  66
  67   void StartCheck() {
  68     chromeos::DBusThreadManager::Get()->GetCryptohomeClient()->IsMounted(
  69         base::Bind(&CryptohomedChecker::OnCryptohomeIsMounted,
  70                    AsWeakPtr()));
  71   }
  72
  73  private:
  74   void OnCryptohomeIsMounted(chromeos::DBusMethodCallStatus call_status,
  75                              bool is_mounted) {
  76     if (call_status != chromeos::DBUS_METHOD_CALL_SUCCESS) {
  77       const int kMaxRetryTimes = 5;
  78       ++retry_count_;
  79       if (retry_count_ > kMaxRetryTimes) {
  80         LOG(ERROR) << "Could not talk to cryptohomed for launching kiosk app.";
  81         ReportCheckResult(KioskAppLaunchError::CRYPTOHOMED_NOT_RUNNING);
  82         return;
  83       }
  84
  85       const int retry_delay_in_milliseconds = 500 * (1 << retry_count_);
  86       base::MessageLoop::current()->PostDelayedTask(
  87           FROM_HERE,
  88           base::Bind(&CryptohomedChecker::StartCheck, AsWeakPtr()),
  89           base::TimeDelta::FromMilliseconds(retry_delay_in_milliseconds));
  90       return;
  91     }
  92
  93     if (is_mounted)
  94       LOG(ERROR) << "Cryptohome is mounted before launching kiosk app.";
  95
  96     // Proceed only when cryptohome is not mounded or running on dev box.
  97     if (!is_mounted || !base::SysInfo::IsRunningOnChromeOS())
  98       ReportCheckResult(KioskAppLaunchError::NONE);
  99     else
 100       ReportCheckResult(KioskAppLaunchError::ALREADY_MOUNTED);
 101   }
 102
 103   void ReportCheckResult(KioskAppLaunchError::Error error) {
 104     if (error == KioskAppLaunchError::NONE)
 105       loader_->LoginAsKioskAccount();
 106     else
 107       loader_->ReportLaunchResult(error);
 108   }
 109
 110   KioskProfileLoader* loader_;
 111   int retry_count_;
 112
 113   DISALLOW_COPY_AND_ASSIGN(CryptohomedChecker);
 114 };
 115
 116
 117 ////////////////////////////////////////////////////////////////////////////////
 118 // KioskProfileLoader
 119
 120 KioskProfileLoader::KioskProfileLoader(const std::string& app_user_id,
 121                                        bool use_guest_mount,
 122                                        Delegate* delegate)
 123     : user_id_(app_user_id),
 124       use_guest_mount_(use_guest_mount),
 125       delegate_(delegate) {}
 126
 127 KioskProfileLoader::~KioskProfileLoader() {}
 128
 129 void KioskProfileLoader::Start() {
 130   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 131   login_performer_.reset();
 132   cryptohomed_checker_.reset(new CryptohomedChecker(this));
 133   cryptohomed_checker_->StartCheck();
 134 }
 135
 136 void KioskProfileLoader::LoginAsKioskAccount() {
 137   login_performer_.reset(new LoginPerformer(this));
 138   login_performer_->LoginAsKioskAccount(user_id_, use_guest_mount_);
 139 }
 140
 141 void KioskProfileLoader::ReportLaunchResult(KioskAppLaunchError::Error error) {
 142   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 143
 144   if (error != KioskAppLaunchError::NONE) {
 145     delegate_->OnProfileLoadFailed(error);
 146   }
 147 }
 148
 149 void KioskProfileLoader::OnLoginSuccess(const UserContext& user_context)  {
 150   // LoginPerformer will delete itself.
 151   login_performer_->set_delegate(NULL);
 152   ignore_result(login_performer_.release());
 153
 154   // If we are launching a demo session, we need to start MountGuest with the
 155   // guest username; this is because there are several places in the cros code
 156   // which rely on the username sent to cryptohome to be $guest. Back in Chrome
 157   // we switch this back to the demo user name to correctly identify this
 158   // user as a demo user.
 159   UserContext context = user_context;
 160   if (context.GetUserID() == UserManager::kGuestUserName)
 161     context.SetUserID(DemoAppLauncher::kDemoUserName);
 162   LoginUtils::Get()->PrepareProfile(context,
 163                                     std::string(),  // display email
 164                                     false,  // has_cookies
 165                                     false,  // has_active_session
 166                                     this);
 167 }
 168
 169 void KioskProfileLoader::OnLoginFailure(const LoginFailure& error) {
 170   ReportLaunchResult(LoginFailureToKioskAppLaunchError(error));
 171 }
 172
 173 void KioskProfileLoader::WhiteListCheckFailed(const std::string& email) {
 174   NOTREACHED();
 175 }
 176
 177 void KioskProfileLoader::PolicyLoadFailed() {
 178   ReportLaunchResult(KioskAppLaunchError::POLICY_LOAD_FAILED);
 179 }
 180
 181 void KioskProfileLoader::OnOnlineChecked(
 182     const std::string& email, bool success) {
 183   NOTREACHED();
 184 }
 185
 186 void KioskProfileLoader::OnProfilePrepared(Profile* profile) {
 187   // This object could be deleted any time after successfully reporting
 188   // a profile load, so invalidate the LoginUtils delegate now.
 189   LoginUtils::Get()->DelegateDeleted(this);
 190
 191   delegate_->OnProfileLoaded(profile);
 192   ReportLaunchResult(KioskAppLaunchError::NONE);
 193 }
 194
 195 }  // namespace chromeos