chrome/browser/chromeos/login/users/multi_profile_user_controller.cc

   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/chromeos/login/users/multi_profile_user_controller.h"
   6
   7 #include "base/bind.h"
   8 #include "base/memory/scoped_ptr.h"
   9 #include "base/prefs/pref_change_registrar.h"
  10 #include "base/prefs/pref_registry_simple.h"
  11 #include "base/prefs/pref_service.h"
  12 #include "base/prefs/scoped_user_pref_update.h"
  13 #include "chrome/browser/chromeos/login/users/multi_profile_user_controller_delegate.h"
  14 #include "chrome/browser/chromeos/policy/policy_cert_service.h"
  15 #include "chrome/browser/chromeos/policy/policy_cert_service_factory.h"
  16 #include "chrome/browser/chromeos/profiles/profile_helper.h"
  17 #include "chrome/browser/prefs/pref_service_syncable.h"
  18 #include "chrome/browser/profiles/profile.h"
  19 #include "chrome/common/pref_names.h"
  20 #include "components/user_manager/user.h"
  21 #include "components/user_manager/user_manager.h"
  22 #include "google_apis/gaia/gaia_auth_util.h"
  23
  24 namespace chromeos {
  25
  26 namespace {
  27
  28 std::string SanitizeBehaviorValue(const std::string& value) {
  29   if (value == MultiProfileUserController::kBehaviorUnrestricted ||
  30       value == MultiProfileUserController::kBehaviorPrimaryOnly ||
  31       value == MultiProfileUserController::kBehaviorNotAllowed) {
  32     return value;
  33   }
  34
  35   return std::string(MultiProfileUserController::kBehaviorUnrestricted);
  36 }
  37
  38 bool SetUserAllowedReason(
  39     MultiProfileUserController::UserAllowedInSessionReason* reason,
  40     MultiProfileUserController::UserAllowedInSessionReason value) {
  41   if (reason)
  42     *reason = value;
  43   return value == MultiProfileUserController::ALLOWED;
  44 }
  45
  46 }  // namespace
  47
  48 // static
  49 const char MultiProfileUserController::kBehaviorUnrestricted[] = "unrestricted";
  50 const char MultiProfileUserController::kBehaviorPrimaryOnly[] = "primary-only";
  51 const char MultiProfileUserController::kBehaviorNotAllowed[] = "not-allowed";
  52
  53 // Note: this policy value is not a real one an is only returned locally for
  54 // owner users instead of default one kBehaviorUnrestricted.
  55 const char MultiProfileUserController::kBehaviorOwnerPrimaryOnly[] =
  56     "owner-primary-only";
  57
  58 MultiProfileUserController::MultiProfileUserController(
  59     MultiProfileUserControllerDelegate* delegate,
  60     PrefService* local_state)
  61     : delegate_(delegate),
  62       local_state_(local_state) {
  63 }
  64
  65 MultiProfileUserController::~MultiProfileUserController() {}
  66
  67 // static
  68 void MultiProfileUserController::RegisterPrefs(
  69     PrefRegistrySimple* registry) {
  70   registry->RegisterDictionaryPref(prefs::kCachedMultiProfileUserBehavior);
  71 }
  72
  73 // static
  74 void MultiProfileUserController::RegisterProfilePrefs(
  75     user_prefs::PrefRegistrySyncable* registry) {
  76   registry->RegisterStringPref(prefs::kMultiProfileUserBehavior,
  77                                kBehaviorUnrestricted);
  78   registry->RegisterBooleanPref(
  79       prefs::kMultiProfileNeverShowIntro,
  80       false,
  81       user_prefs::PrefRegistrySyncable::SYNCABLE_PREF);
  82   registry->RegisterBooleanPref(
  83       prefs::kMultiProfileWarningShowDismissed,
  84       false,
  85       user_prefs::PrefRegistrySyncable::SYNCABLE_PREF);
  86 }
  87
  88 // static
  89 MultiProfileUserController::UserAllowedInSessionReason
  90 MultiProfileUserController::GetPrimaryUserPolicy() {
  91   user_manager::UserManager* user_manager = user_manager::UserManager::Get();
  92   CHECK(user_manager);
  93
  94   const user_manager::User* user = user_manager->GetPrimaryUser();
  95   if (!user)
  96     return ALLOWED;
  97
  98   // Don't allow any secondary profiles if the primary profile is tainted.
  99   if (policy::PolicyCertServiceFactory::UsedPolicyCertificates(user->email())) {
 100     // Check directly in local_state before checking if the primary user has
 101     // a PolicyCertService. His profile may have been tainted previously though
 102     // he didn't get a PolicyCertService created for this session.
 103     return NOT_ALLOWED_PRIMARY_POLICY_CERT_TAINTED;
 104   }
 105
 106   Profile* profile = ProfileHelper::Get()->GetProfileByUser(user);
 107   if (!profile)
 108     return ALLOWED;
 109
 110   // If the primary profile already has policy certificates installed but
 111   // hasn't used them yet then it can become tainted at any time during this
 112   // session disable secondary profiles in this case too.
 113   policy::PolicyCertService* service =
 114       policy::PolicyCertServiceFactory::GetForProfile(profile);
 115   if (service && service->has_policy_certificates())
 116     return NOT_ALLOWED_PRIMARY_POLICY_CERT_TAINTED;
 117
 118   // No user is allowed if the primary user policy forbids it.
 119   const std::string behavior = profile->GetPrefs()->GetString(
 120       prefs::kMultiProfileUserBehavior);
 121   if (behavior == kBehaviorNotAllowed)
 122     return NOT_ALLOWED_PRIMARY_USER_POLICY_FORBIDS;
 123
 124   return ALLOWED;
 125 }
 126
 127 bool MultiProfileUserController::IsUserAllowedInSession(
 128     const std::string& user_email,
 129     MultiProfileUserController::UserAllowedInSessionReason* reason) const {
 130   user_manager::UserManager* user_manager = user_manager::UserManager::Get();
 131   CHECK(user_manager);
 132
 133   const user_manager::User* primary_user = user_manager->GetPrimaryUser();
 134   std::string primary_user_email;
 135   if (primary_user)
 136     primary_user_email = primary_user->email();
 137
 138   // Always allow if there is no primary user or user being checked is the
 139   // primary user.
 140   if (primary_user_email.empty() || primary_user_email == user_email)
 141     return SetUserAllowedReason(reason, ALLOWED);
 142
 143   // Don't allow profiles potentially tainted by data fetched with policy-pushed
 144   // certificates to join a multiprofile session.
 145   if (policy::PolicyCertServiceFactory::UsedPolicyCertificates(user_email))
 146     return SetUserAllowedReason(reason, NOT_ALLOWED_POLICY_CERT_TAINTED);
 147
 148   UserAllowedInSessionReason primary_user_policy = GetPrimaryUserPolicy();
 149   if (primary_user_policy != ALLOWED)
 150     return SetUserAllowedReason(reason, primary_user_policy);
 151
 152   // The user must have 'unrestricted' policy to be a secondary user.
 153   const std::string behavior = GetCachedValue(user_email);
 154   return SetUserAllowedReason(
 155       reason,
 156       behavior == kBehaviorUnrestricted ? ALLOWED : NOT_ALLOWED_POLICY_FORBIDS);
 157 }
 158
 159 void MultiProfileUserController::StartObserving(Profile* user_profile) {
 160   // Profile name could be empty during tests.
 161   if (user_profile->GetProfileUserName().empty())
 162     return;
 163
 164   scoped_ptr<PrefChangeRegistrar> registrar(new PrefChangeRegistrar);
 165   registrar->Init(user_profile->GetPrefs());
 166   registrar->Add(
 167       prefs::kMultiProfileUserBehavior,
 168       base::Bind(&MultiProfileUserController::OnUserPrefChanged,
 169                  base::Unretained(this),
 170                  user_profile));
 171   pref_watchers_.push_back(registrar.release());
 172
 173   OnUserPrefChanged(user_profile);
 174 }
 175
 176 void MultiProfileUserController::RemoveCachedValues(
 177     const std::string& user_email) {
 178   DictionaryPrefUpdate update(local_state_,
 179                               prefs::kCachedMultiProfileUserBehavior);
 180   update->RemoveWithoutPathExpansion(user_email, NULL);
 181   policy::PolicyCertServiceFactory::ClearUsedPolicyCertificates(user_email);
 182 }
 183
 184 std::string MultiProfileUserController::GetCachedValue(
 185     const std::string& user_email) const {
 186   const base::DictionaryValue* dict =
 187       local_state_->GetDictionary(prefs::kCachedMultiProfileUserBehavior);
 188   std::string value;
 189   if (dict && dict->GetStringWithoutPathExpansion(user_email, &value))
 190     return SanitizeBehaviorValue(value);
 191
 192   return std::string(kBehaviorUnrestricted);
 193 }
 194
 195 void MultiProfileUserController::SetCachedValue(
 196     const std::string& user_email,
 197     const std::string& behavior) {
 198   DictionaryPrefUpdate update(local_state_,
 199                               prefs::kCachedMultiProfileUserBehavior);
 200   update->SetStringWithoutPathExpansion(user_email,
 201                                         SanitizeBehaviorValue(behavior));
 202 }
 203
 204 void MultiProfileUserController::CheckSessionUsers() {
 205   const user_manager::UserList& users =
 206       user_manager::UserManager::Get()->GetLoggedInUsers();
 207   for (user_manager::UserList::const_iterator it = users.begin();
 208        it != users.end();
 209        ++it) {
 210     if (!IsUserAllowedInSession((*it)->email(), NULL)) {
 211       delegate_->OnUserNotAllowed((*it)->email());
 212       return;
 213     }
 214   }
 215 }
 216
 217 void MultiProfileUserController::OnUserPrefChanged(
 218     Profile* user_profile) {
 219   std::string user_email = user_profile->GetProfileUserName();
 220   CHECK(!user_email.empty());
 221   user_email = gaia::CanonicalizeEmail(user_email);
 222
 223   PrefService* prefs = user_profile->GetPrefs();
 224   if (prefs->FindPreference(prefs::kMultiProfileUserBehavior)
 225           ->IsDefaultValue()) {
 226     // Migration code to clear cached default behavior.
 227     // TODO(xiyuan): Remove this after M35.
 228     DictionaryPrefUpdate update(local_state_,
 229                                 prefs::kCachedMultiProfileUserBehavior);
 230     update->RemoveWithoutPathExpansion(user_email, NULL);
 231   } else {
 232     const std::string behavior =
 233         prefs->GetString(prefs::kMultiProfileUserBehavior);
 234     SetCachedValue(user_email, behavior);
 235   }
 236
 237   CheckSessionUsers();
 238 }
 239
 240 }  // namespace chromeos