src/chrome/browser/chromeos/settings/session_manager_operation.cc

   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/chromeos/settings/session_manager_operation.h"
   6
   7 #include "base/bind.h"
   8 #include "base/bind_helpers.h"
   9 #include "base/files/file_path.h"
  10 #include "base/message_loop/message_loop.h"
  11 #include "base/stl_util.h"
  12 #include "base/task_runner_util.h"
  13 #include "base/threading/sequenced_worker_pool.h"
  14 #include "base/time/time.h"
  15 #include "chrome/browser/chromeos/settings/owner_key_util.h"
  16 #include "chrome/browser/policy/cloud/cloud_policy_constants.h"
  17 #include "chrome/browser/policy/proto/chromeos/chrome_device_policy.pb.h"
  18 #include "chrome/browser/policy/proto/cloud/device_management_backend.pb.h"
  19 #include "content/public/browser/browser_thread.h"
  20 #include "crypto/rsa_private_key.h"
  21 #include "crypto/signature_creator.h"
  22
  23 namespace em = enterprise_management;
  24
  25 namespace chromeos {
  26
  27 SessionManagerOperation::SessionManagerOperation(const Callback& callback)
  28     : session_manager_client_(NULL),
  29       weak_factory_(this),
  30       callback_(callback),
  31       force_key_load_(false),
  32       is_loading_(false) {}
  33
  34 SessionManagerOperation::~SessionManagerOperation() {}
  35
  36 void SessionManagerOperation::Start(
  37     SessionManagerClient* session_manager_client,
  38     scoped_refptr<OwnerKeyUtil> owner_key_util,
  39     scoped_refptr<OwnerKey> owner_key) {
  40   session_manager_client_ = session_manager_client;
  41   owner_key_util_ = owner_key_util;
  42   owner_key_ = owner_key;
  43   Run();
  44 }
  45
  46 void SessionManagerOperation::RestartLoad(bool key_changed) {
  47   if (key_changed)
  48     owner_key_ = NULL;
  49
  50   if (!is_loading_)
  51     return;
  52
  53   // Abort previous load operations.
  54   weak_factory_.InvalidateWeakPtrs();
  55   // Mark as not loading to start loading again.
  56   is_loading_ = false;
  57   StartLoading();
  58 }
  59
  60 void SessionManagerOperation::StartLoading() {
  61   if (is_loading_)
  62     return;
  63   is_loading_ = true;
  64   EnsureOwnerKey(base::Bind(&SessionManagerOperation::RetrieveDeviceSettings,
  65                             weak_factory_.GetWeakPtr()));
  66 }
  67
  68 void SessionManagerOperation::ReportResult(
  69     DeviceSettingsService::Status status) {
  70   callback_.Run(this, status);
  71 }
  72
  73 void SessionManagerOperation::EnsureOwnerKey(const base::Closure& callback) {
  74   if (force_key_load_ || !owner_key_.get() || !owner_key_->public_key()) {
  75     scoped_refptr<base::TaskRunner> task_runner =
  76         content::BrowserThread::GetBlockingPool()->
  77         GetTaskRunnerWithShutdownBehavior(
  78             base::SequencedWorkerPool::SKIP_ON_SHUTDOWN);
  79     base::PostTaskAndReplyWithResult(
  80         task_runner.get(),
  81         FROM_HERE,
  82         base::Bind(&SessionManagerOperation::LoadOwnerKey,
  83                    owner_key_util_, owner_key_),
  84         base::Bind(&SessionManagerOperation::StoreOwnerKey,
  85                    weak_factory_.GetWeakPtr(), callback));
  86   } else {
  87     callback.Run();
  88   }
  89 }
  90
  91 // static
  92 scoped_refptr<OwnerKey> SessionManagerOperation::LoadOwnerKey(
  93     scoped_refptr<OwnerKeyUtil> util,
  94     scoped_refptr<OwnerKey> current_key) {
  95   scoped_ptr<std::vector<uint8> > public_key;
  96   scoped_ptr<crypto::RSAPrivateKey> private_key;
  97
  98   // Keep any already-existing keys.
  99   if (current_key.get()) {
 100     if (current_key->public_key())
 101       public_key.reset(new std::vector<uint8>(*current_key->public_key()));
 102     if (current_key->private_key())
 103       private_key.reset(current_key->private_key()->Copy());
 104   }
 105
 106   if (!public_key.get() && util->IsPublicKeyPresent()) {
 107     public_key.reset(new std::vector<uint8>());
 108     if (!util->ImportPublicKey(public_key.get()))
 109       LOG(ERROR) << "Failed to load public owner key.";
 110   }
 111
 112   if (public_key.get() && !private_key.get()) {
 113     private_key.reset(util->FindPrivateKey(*public_key));
 114     if (!private_key.get())
 115       VLOG(1) << "Failed to load private owner key.";
 116   }
 117
 118   return new OwnerKey(public_key.Pass(), private_key.Pass());
 119 }
 120
 121 void SessionManagerOperation::StoreOwnerKey(const base::Closure& callback,
 122                                             scoped_refptr<OwnerKey> new_key) {
 123   force_key_load_ = false;
 124   owner_key_ = new_key;
 125
 126   if (!owner_key_.get() || !owner_key_->public_key()) {
 127     ReportResult(DeviceSettingsService::STORE_KEY_UNAVAILABLE);
 128     return;
 129   }
 130
 131   callback.Run();
 132 }
 133
 134 void SessionManagerOperation::RetrieveDeviceSettings() {
 135   session_manager_client()->RetrieveDevicePolicy(
 136       base::Bind(&SessionManagerOperation::ValidateDeviceSettings,
 137                  weak_factory_.GetWeakPtr()));
 138 }
 139
 140 void SessionManagerOperation::ValidateDeviceSettings(
 141     const std::string& policy_blob) {
 142   scoped_ptr<em::PolicyFetchResponse> policy(new em::PolicyFetchResponse());
 143   if (policy_blob.empty()) {
 144     ReportResult(DeviceSettingsService::STORE_NO_POLICY);
 145     return;
 146   }
 147
 148   if (!policy->ParseFromString(policy_blob) ||
 149       !policy->IsInitialized()) {
 150     ReportResult(DeviceSettingsService::STORE_INVALID_POLICY);
 151     return;
 152   }
 153
 154   base::SequencedWorkerPool* pool =
 155       content::BrowserThread::GetBlockingPool();
 156   scoped_refptr<base::SequencedTaskRunner> background_task_runner =
 157       pool->GetSequencedTaskRunnerWithShutdownBehavior(
 158           pool->GetSequenceToken(),
 159           base::SequencedWorkerPool::SKIP_ON_SHUTDOWN);
 160
 161   policy::DeviceCloudPolicyValidator* validator =
 162       policy::DeviceCloudPolicyValidator::Create(policy.Pass(),
 163                                                  background_task_runner);
 164
 165
 166   // Policy auto-generated by session manager doesn't include a timestamp, so
 167   // the timestamp shouldn't be verified in that case.
 168   //
 169   // Additionally, offline devices can get their clock set backwards in time
 170   // under some hardware conditions; checking the timestamp now could likely
 171   // find a value in the future, and prevent the user from signing-in or
 172   // starting guest mode. Tlsdate will eventually fix the clock when the device
 173   // is back online, but the network configuration may come from device ONC.
 174   //
 175   // To prevent all of these issues the timestamp is just not verified when
 176   // loading the device policy from the cache. Note that the timestamp is still
 177   // verified during enrollment and when a new policy is fetched from the
 178   // server.
 179   validator->ValidateAgainstCurrentPolicy(
 180       policy_data_.get(),
 181       policy::CloudPolicyValidatorBase::TIMESTAMP_NOT_REQUIRED,
 182       policy::CloudPolicyValidatorBase::DM_TOKEN_NOT_REQUIRED);
 183   validator->ValidatePolicyType(policy::dm_protocol::kChromeDevicePolicyType);
 184   validator->ValidatePayload();
 185   validator->ValidateSignature(*owner_key_->public_key(), false);
 186   validator->StartValidation(
 187       base::Bind(&SessionManagerOperation::ReportValidatorStatus,
 188                  weak_factory_.GetWeakPtr()));
 189 }
 190
 191 void SessionManagerOperation::ReportValidatorStatus(
 192     policy::DeviceCloudPolicyValidator* validator) {
 193   DeviceSettingsService::Status status =
 194       DeviceSettingsService::STORE_VALIDATION_ERROR;
 195   if (validator->success()) {
 196     status = DeviceSettingsService::STORE_SUCCESS;
 197     policy_data_ = validator->policy_data().Pass();
 198     device_settings_ = validator->payload().Pass();
 199   } else {
 200     LOG(ERROR) << "Policy validation failed: " << validator->status();
 201
 202     // Those are mostly caused by RTC loss and are recoverable.
 203     if (validator->status() ==
 204         policy::DeviceCloudPolicyValidator::VALIDATION_BAD_TIMESTAMP) {
 205       status = DeviceSettingsService::STORE_TEMP_VALIDATION_ERROR;
 206     }
 207   }
 208
 209   ReportResult(status);
 210 }
 211
 212 LoadSettingsOperation::LoadSettingsOperation(const Callback& callback)
 213     : SessionManagerOperation(callback) {}
 214
 215 LoadSettingsOperation::~LoadSettingsOperation() {}
 216
 217 void LoadSettingsOperation::Run() {
 218   StartLoading();
 219 }
 220
 221 StoreSettingsOperation::StoreSettingsOperation(
 222     const Callback& callback,
 223     scoped_ptr<em::PolicyFetchResponse> policy)
 224     : SessionManagerOperation(callback),
 225       policy_(policy.Pass()),
 226       weak_factory_(this) {}
 227
 228 StoreSettingsOperation::~StoreSettingsOperation() {}
 229
 230 void StoreSettingsOperation::Run() {
 231   session_manager_client()->StoreDevicePolicy(
 232       policy_->SerializeAsString(),
 233       base::Bind(&StoreSettingsOperation::HandleStoreResult,
 234                  weak_factory_.GetWeakPtr()));
 235 }
 236
 237 void StoreSettingsOperation::HandleStoreResult(bool success) {
 238   if (!success)
 239     ReportResult(DeviceSettingsService::STORE_OPERATION_FAILED);
 240   else
 241     StartLoading();
 242 }
 243
 244 SignAndStoreSettingsOperation::SignAndStoreSettingsOperation(
 245     const Callback& callback,
 246     scoped_ptr<em::ChromeDeviceSettingsProto> new_settings,
 247     const std::string& username)
 248     : SessionManagerOperation(callback),
 249       new_settings_(new_settings.Pass()),
 250       username_(username),
 251       weak_factory_(this) {
 252   DCHECK(new_settings_.get());
 253 }
 254
 255 SignAndStoreSettingsOperation::~SignAndStoreSettingsOperation() {}
 256
 257 void SignAndStoreSettingsOperation::Run() {
 258   EnsureOwnerKey(base::Bind(&SignAndStoreSettingsOperation::StartSigning,
 259                             weak_factory_.GetWeakPtr()));
 260 }
 261
 262 void SignAndStoreSettingsOperation::StartSigning() {
 263   if (!owner_key().get() || !owner_key()->private_key() || username_.empty()) {
 264     ReportResult(DeviceSettingsService::STORE_KEY_UNAVAILABLE);
 265     return;
 266   }
 267
 268   base::PostTaskAndReplyWithResult(
 269       content::BrowserThread::GetBlockingPool(),
 270       FROM_HERE,
 271       base::Bind(&SignAndStoreSettingsOperation::AssembleAndSignPolicy,
 272                  base::Passed(&new_settings_), username_, owner_key()),
 273       base::Bind(&SignAndStoreSettingsOperation::StoreDeviceSettingsBlob,
 274                  weak_factory_.GetWeakPtr()));
 275 }
 276
 277 // static
 278 std::string SignAndStoreSettingsOperation::AssembleAndSignPolicy(
 279     scoped_ptr<em::ChromeDeviceSettingsProto> device_settings,
 280     const std::string& username,
 281     scoped_refptr<OwnerKey> owner_key) {
 282   // Assemble the policy.
 283   em::PolicyFetchResponse policy_response;
 284   em::PolicyData policy;
 285   policy.set_policy_type(policy::dm_protocol::kChromeDevicePolicyType);
 286   policy.set_timestamp((base::Time::NowFromSystemTime() -
 287                         base::Time::UnixEpoch()).InMilliseconds());
 288   policy.set_username(username);
 289   if (!device_settings->SerializeToString(policy.mutable_policy_value()) ||
 290       !policy.SerializeToString(policy_response.mutable_policy_data())) {
 291     LOG(ERROR) << "Failed to encode policy payload.";
 292     return std::string();
 293   }
 294
 295   // Generate the signature.
 296   scoped_ptr<crypto::SignatureCreator> signature_creator(
 297       crypto::SignatureCreator::Create(owner_key->private_key()));
 298   signature_creator->Update(
 299       reinterpret_cast<const uint8*>(policy_response.policy_data().c_str()),
 300       policy_response.policy_data().size());
 301   std::vector<uint8> signature_bytes;
 302   std::string policy_blob;
 303   if (!signature_creator->Final(&signature_bytes)) {
 304     LOG(ERROR) << "Failed to create policy signature.";
 305     return std::string();
 306   }
 307
 308   policy_response.mutable_policy_data_signature()->assign(
 309       reinterpret_cast<const char*>(vector_as_array(&signature_bytes)),
 310       signature_bytes.size());
 311   return policy_response.SerializeAsString();
 312 }
 313
 314 void SignAndStoreSettingsOperation::StoreDeviceSettingsBlob(
 315     std::string device_settings_blob) {
 316   if (device_settings_blob.empty()) {
 317     ReportResult(DeviceSettingsService::STORE_POLICY_ERROR);
 318     return;
 319   }
 320
 321   session_manager_client()->StoreDevicePolicy(
 322       device_settings_blob,
 323       base::Bind(&SignAndStoreSettingsOperation::HandleStoreResult,
 324                  weak_factory_.GetWeakPtr()));
 325 }
 326
 327 void SignAndStoreSettingsOperation::HandleStoreResult(bool success) {
 328   if (!success)
 329     ReportResult(DeviceSettingsService::STORE_OPERATION_FAILED);
 330   else
 331     StartLoading();
 332 }
 333
 334 }  // namespace chromeos