session_manager_operation.cc revision eb525c5499e34cc9c4b825d6d9e75bb07cc06ace 
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.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
23namespace em = enterprise_management;
24
25namespace chromeos {
26
27SessionManagerOperation::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
34SessionManagerOperation::~SessionManagerOperation() {}
35
36void 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
46void 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  StartLoading();
56}
57
58void SessionManagerOperation::StartLoading() {
59  is_loading_ = true;
60  EnsureOwnerKey(base::Bind(&SessionManagerOperation::RetrieveDeviceSettings,
61                            weak_factory_.GetWeakPtr()));
62}
63
64void SessionManagerOperation::ReportResult(
65    DeviceSettingsService::Status status) {
66  callback_.Run(this, status);
67}
68
69void SessionManagerOperation::EnsureOwnerKey(const base::Closure& callback) {
70  if (force_key_load_ || !owner_key_.get() || !owner_key_->public_key()) {
71    base::PostTaskAndReplyWithResult(
72        content::BrowserThread::GetBlockingPool(),
73        FROM_HERE,
74        base::Bind(&SessionManagerOperation::LoadOwnerKey,
75                   owner_key_util_, owner_key_),
76        base::Bind(&SessionManagerOperation::StoreOwnerKey,
77                   weak_factory_.GetWeakPtr(), callback));
78  } else {
79    callback.Run();
80  }
81}
82
83// static
84scoped_refptr<OwnerKey> SessionManagerOperation::LoadOwnerKey(
85    scoped_refptr<OwnerKeyUtil> util,
86    scoped_refptr<OwnerKey> current_key) {
87  scoped_ptr<std::vector<uint8> > public_key;
88  scoped_ptr<crypto::RSAPrivateKey> private_key;
89
90  // Keep any already-existing keys.
91  if (current_key.get()) {
92    if (current_key->public_key())
93      public_key.reset(new std::vector<uint8>(*current_key->public_key()));
94    if (current_key->private_key())
95      private_key.reset(current_key->private_key()->Copy());
96  }
97
98  if (!public_key.get() && util->IsPublicKeyPresent()) {
99    public_key.reset(new std::vector<uint8>());
100    if (!util->ImportPublicKey(public_key.get()))
101      LOG(ERROR) << "Failed to load public owner key.";
102  }
103
104  if (public_key.get() && !private_key.get()) {
105    private_key.reset(util->FindPrivateKey(*public_key));
106    if (!private_key.get())
107      VLOG(1) << "Failed to load private owner key.";
108  }
109
110  return new OwnerKey(public_key.Pass(), private_key.Pass());
111}
112
113void SessionManagerOperation::StoreOwnerKey(const base::Closure& callback,
114                                            scoped_refptr<OwnerKey> new_key) {
115  force_key_load_ = false;
116  owner_key_ = new_key;
117
118  if (!owner_key_.get() || !owner_key_->public_key()) {
119    ReportResult(DeviceSettingsService::STORE_KEY_UNAVAILABLE);
120    return;
121  }
122
123  callback.Run();
124}
125
126void SessionManagerOperation::RetrieveDeviceSettings() {
127  session_manager_client()->RetrieveDevicePolicy(
128      base::Bind(&SessionManagerOperation::ValidateDeviceSettings,
129                 weak_factory_.GetWeakPtr()));
130}
131
132void SessionManagerOperation::ValidateDeviceSettings(
133    const std::string& policy_blob) {
134  scoped_ptr<em::PolicyFetchResponse> policy(new em::PolicyFetchResponse());
135  if (policy_blob.empty()) {
136    ReportResult(DeviceSettingsService::STORE_NO_POLICY);
137    return;
138  }
139
140  if (!policy->ParseFromString(policy_blob) ||
141      !policy->IsInitialized()) {
142    ReportResult(DeviceSettingsService::STORE_INVALID_POLICY);
143    return;
144  }
145
146  policy::DeviceCloudPolicyValidator* validator =
147      policy::DeviceCloudPolicyValidator::Create(policy.Pass());
148
149  // Policy auto-generated by session manager doesn't include a timestamp, so we
150  // need to allow missing timestamps.
151  const bool require_timestamp =
152      policy_data_.get() && policy_data_->has_request_token();
153  validator->ValidateAgainstCurrentPolicy(
154      policy_data_.get(),
155      require_timestamp ?
156          policy::CloudPolicyValidatorBase::TIMESTAMP_REQUIRED :
157          policy::CloudPolicyValidatorBase::TIMESTAMP_NOT_REQUIRED,
158      policy::CloudPolicyValidatorBase::DM_TOKEN_NOT_REQUIRED);
159  validator->ValidatePolicyType(policy::dm_protocol::kChromeDevicePolicyType);
160  validator->ValidatePayload();
161  validator->ValidateSignature(*owner_key_->public_key(), false);
162  validator->StartValidation(
163      base::Bind(&SessionManagerOperation::ReportValidatorStatus,
164                 weak_factory_.GetWeakPtr()));
165}
166
167void SessionManagerOperation::ReportValidatorStatus(
168    policy::DeviceCloudPolicyValidator* validator) {
169  DeviceSettingsService::Status status =
170      DeviceSettingsService::STORE_VALIDATION_ERROR;
171  if (validator->success()) {
172    status = DeviceSettingsService::STORE_SUCCESS;
173    policy_data_ = validator->policy_data().Pass();
174    device_settings_ = validator->payload().Pass();
175  } else {
176    LOG(ERROR) << "Policy validation failed: " << validator->status();
177
178    // Those are mostly caused by RTC loss and are recoverable.
179    if (validator->status() ==
180        policy::DeviceCloudPolicyValidator::VALIDATION_BAD_TIMESTAMP) {
181      status = DeviceSettingsService::STORE_TEMP_VALIDATION_ERROR;
182    }
183  }
184
185  ReportResult(status);
186}
187
188LoadSettingsOperation::LoadSettingsOperation(const Callback& callback)
189    : SessionManagerOperation(callback) {}
190
191LoadSettingsOperation::~LoadSettingsOperation() {}
192
193void LoadSettingsOperation::Run() {
194  StartLoading();
195}
196
197StoreSettingsOperation::StoreSettingsOperation(
198    const Callback& callback,
199    scoped_ptr<em::PolicyFetchResponse> policy)
200    : SessionManagerOperation(callback),
201      policy_(policy.Pass()),
202      weak_factory_(this) {}
203
204StoreSettingsOperation::~StoreSettingsOperation() {}
205
206void StoreSettingsOperation::Run() {
207  session_manager_client()->StoreDevicePolicy(
208      policy_->SerializeAsString(),
209      base::Bind(&StoreSettingsOperation::HandleStoreResult,
210                 weak_factory_.GetWeakPtr()));
211}
212
213void StoreSettingsOperation::HandleStoreResult(bool success) {
214  if (!success)
215    ReportResult(DeviceSettingsService::STORE_OPERATION_FAILED);
216  else
217    StartLoading();
218}
219
220SignAndStoreSettingsOperation::SignAndStoreSettingsOperation(
221    const Callback& callback,
222    scoped_ptr<em::ChromeDeviceSettingsProto> new_settings,
223    const std::string& username)
224    : SessionManagerOperation(callback),
225      new_settings_(new_settings.Pass()),
226      username_(username),
227      weak_factory_(this) {
228  DCHECK(new_settings_.get());
229}
230
231SignAndStoreSettingsOperation::~SignAndStoreSettingsOperation() {}
232
233void SignAndStoreSettingsOperation::Run() {
234  EnsureOwnerKey(base::Bind(&SignAndStoreSettingsOperation::StartSigning,
235                            weak_factory_.GetWeakPtr()));
236}
237
238void SignAndStoreSettingsOperation::StartSigning() {
239  if (!owner_key() || !owner_key()->private_key() || username_.empty()) {
240    ReportResult(DeviceSettingsService::STORE_KEY_UNAVAILABLE);
241    return;
242  }
243
244  base::PostTaskAndReplyWithResult(
245      content::BrowserThread::GetBlockingPool(),
246      FROM_HERE,
247      base::Bind(&SignAndStoreSettingsOperation::AssembleAndSignPolicy,
248                 base::Passed(&new_settings_), username_, owner_key()),
249      base::Bind(&SignAndStoreSettingsOperation::StoreDeviceSettingsBlob,
250                 weak_factory_.GetWeakPtr()));
251}
252
253// static
254std::string SignAndStoreSettingsOperation::AssembleAndSignPolicy(
255    scoped_ptr<em::ChromeDeviceSettingsProto> device_settings,
256    const std::string& username,
257    scoped_refptr<OwnerKey> owner_key) {
258  // Assemble the policy.
259  em::PolicyFetchResponse policy_response;
260  em::PolicyData policy;
261  policy.set_policy_type(policy::dm_protocol::kChromeDevicePolicyType);
262  policy.set_timestamp((base::Time::NowFromSystemTime() -
263                        base::Time::UnixEpoch()).InMilliseconds());
264  policy.set_username(username);
265  if (!device_settings->SerializeToString(policy.mutable_policy_value()) ||
266      !policy.SerializeToString(policy_response.mutable_policy_data())) {
267    LOG(ERROR) << "Failed to encode policy payload.";
268    return std::string();
269  }
270
271  // Generate the signature.
272  scoped_ptr<crypto::SignatureCreator> signature_creator(
273      crypto::SignatureCreator::Create(owner_key->private_key()));
274  signature_creator->Update(
275      reinterpret_cast<const uint8*>(policy_response.policy_data().c_str()),
276      policy_response.policy_data().size());
277  std::vector<uint8> signature_bytes;
278  std::string policy_blob;
279  if (!signature_creator->Final(&signature_bytes)) {
280    LOG(ERROR) << "Failed to create policy signature.";
281    return std::string();
282  }
283
284  policy_response.mutable_policy_data_signature()->assign(
285      reinterpret_cast<const char*>(vector_as_array(&signature_bytes)),
286      signature_bytes.size());
287  return policy_response.SerializeAsString();
288}
289
290void SignAndStoreSettingsOperation::StoreDeviceSettingsBlob(
291    std::string device_settings_blob) {
292  if (device_settings_blob.empty()) {
293    ReportResult(DeviceSettingsService::STORE_POLICY_ERROR);
294    return;
295  }
296
297  session_manager_client()->StoreDevicePolicy(
298      device_settings_blob,
299      base::Bind(&SignAndStoreSettingsOperation::HandleStoreResult,
300                 weak_factory_.GetWeakPtr()));
301}
302
303void SignAndStoreSettingsOperation::HandleStoreResult(bool success) {
304  if (!success)
305    ReportResult(DeviceSettingsService::STORE_OPERATION_FAILED);
306  else
307    StartLoading();
308}
309
310}  // namespace chromeos
311