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| 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 <algorithm> | |
| 6 | |
| 7 #include "base/base64.h" | |
| 8 #include "base/logging.h" | |
| 9 #include "chrome/browser/sync/util/cryptographer.h" | |
| 10 #include "chrome/browser/sync/util/encryptor.h" | |
| 11 | |
| 12 namespace browser_sync { | |
| 13 | |
| 14 const char kNigoriTag[] = "google_chrome_nigori"; | |
| 15 | |
| 16 // We name a particular Nigori instance (ie. a triplet consisting of a hostname, | |
| 17 // a username, and a password) by calling Permute on this string. Since the | |
| 18 // output of Permute is always the same for a given triplet, clients will always | |
| 19 // assign the same name to a particular triplet. | |
| 20 const char kNigoriKeyName[] = "nigori-key"; | |
| 21 | |
| 22 Cryptographer::Observer::~Observer() {} | |
| 23 | |
| 24 Cryptographer::Cryptographer(Encryptor* encryptor) | |
| 25 : encryptor_(encryptor), | |
| 26 default_nigori_(NULL), | |
| 27 encrypted_types_(SensitiveTypes()), | |
| 28 encrypt_everything_(false) { | |
| 29 DCHECK(encryptor); | |
| 30 } | |
| 31 | |
| 32 Cryptographer::~Cryptographer() {} | |
| 33 | |
| 34 void Cryptographer::AddObserver(Observer* observer) { | |
| 35 observers_.AddObserver(observer); | |
| 36 } | |
| 37 | |
| 38 void Cryptographer::RemoveObserver(Observer* observer) { | |
| 39 observers_.RemoveObserver(observer); | |
| 40 } | |
| 41 | |
| 42 void Cryptographer::Bootstrap(const std::string& restored_bootstrap_token) { | |
| 43 if (is_initialized()) { | |
| 44 NOTREACHED(); | |
| 45 return; | |
| 46 } | |
| 47 | |
| 48 scoped_ptr<Nigori> nigori(UnpackBootstrapToken(restored_bootstrap_token)); | |
| 49 if (nigori.get()) | |
| 50 AddKeyImpl(nigori.release()); | |
| 51 } | |
| 52 | |
| 53 bool Cryptographer::CanDecrypt(const sync_pb::EncryptedData& data) const { | |
| 54 return nigoris_.end() != nigoris_.find(data.key_name()); | |
| 55 } | |
| 56 | |
| 57 bool Cryptographer::CanDecryptUsingDefaultKey( | |
| 58 const sync_pb::EncryptedData& data) const { | |
| 59 return default_nigori_ && (data.key_name() == default_nigori_->first); | |
| 60 } | |
| 61 | |
| 62 bool Cryptographer::Encrypt( | |
| 63 const ::google::protobuf::MessageLite& message, | |
| 64 sync_pb::EncryptedData* encrypted) const { | |
| 65 DCHECK(encrypted); | |
| 66 if (!default_nigori_) { | |
| 67 LOG(ERROR) << "Cryptographer not ready, failed to encrypt."; | |
| 68 return false; | |
| 69 } | |
| 70 | |
| 71 std::string serialized; | |
| 72 if (!message.SerializeToString(&serialized)) { | |
| 73 LOG(ERROR) << "Message is invalid/missing a required field."; | |
| 74 return false; | |
| 75 } | |
| 76 | |
| 77 if (CanDecryptUsingDefaultKey(*encrypted)) { | |
| 78 const std::string& original_serialized = DecryptToString(*encrypted); | |
| 79 if (original_serialized == serialized) { | |
| 80 DVLOG(2) << "Re-encryption unnecessary, encrypted data already matches."; | |
| 81 return true; | |
| 82 } | |
| 83 } | |
| 84 | |
| 85 encrypted->set_key_name(default_nigori_->first); | |
| 86 if (!default_nigori_->second->Encrypt(serialized, | |
| 87 encrypted->mutable_blob())) { | |
| 88 LOG(ERROR) << "Failed to encrypt data."; | |
| 89 return false; | |
| 90 } | |
| 91 return true; | |
| 92 } | |
| 93 | |
| 94 bool Cryptographer::Decrypt(const sync_pb::EncryptedData& encrypted, | |
| 95 ::google::protobuf::MessageLite* message) const { | |
| 96 DCHECK(message); | |
| 97 std::string plaintext = DecryptToString(encrypted); | |
| 98 return message->ParseFromString(plaintext); | |
| 99 } | |
| 100 | |
| 101 std::string Cryptographer::DecryptToString( | |
| 102 const sync_pb::EncryptedData& encrypted) const { | |
| 103 NigoriMap::const_iterator it = nigoris_.find(encrypted.key_name()); | |
| 104 if (nigoris_.end() == it) { | |
| 105 NOTREACHED() << "Cannot decrypt message"; | |
| 106 return std::string(""); // Caller should have called CanDecrypt(encrypt). | |
| 107 } | |
| 108 | |
| 109 std::string plaintext; | |
| 110 if (!it->second->Decrypt(encrypted.blob(), &plaintext)) { | |
| 111 return std::string(""); | |
| 112 } | |
| 113 | |
| 114 return plaintext; | |
| 115 } | |
| 116 | |
| 117 bool Cryptographer::GetKeys(sync_pb::EncryptedData* encrypted) const { | |
| 118 DCHECK(encrypted); | |
| 119 DCHECK(!nigoris_.empty()); | |
| 120 | |
| 121 // Create a bag of all the Nigori parameters we know about. | |
| 122 sync_pb::NigoriKeyBag bag; | |
| 123 for (NigoriMap::const_iterator it = nigoris_.begin(); it != nigoris_.end(); | |
| 124 ++it) { | |
| 125 const Nigori& nigori = *it->second; | |
| 126 sync_pb::NigoriKey* key = bag.add_key(); | |
| 127 key->set_name(it->first); | |
| 128 nigori.ExportKeys(key->mutable_user_key(), | |
| 129 key->mutable_encryption_key(), | |
| 130 key->mutable_mac_key()); | |
| 131 } | |
| 132 | |
| 133 // Encrypt the bag with the default Nigori. | |
| 134 return Encrypt(bag, encrypted); | |
| 135 } | |
| 136 | |
| 137 bool Cryptographer::AddKey(const KeyParams& params) { | |
| 138 // Create the new Nigori and make it the default encryptor. | |
| 139 scoped_ptr<Nigori> nigori(new Nigori); | |
| 140 if (!nigori->InitByDerivation(params.hostname, | |
| 141 params.username, | |
| 142 params.password)) { | |
| 143 NOTREACHED(); // Invalid username or password. | |
| 144 return false; | |
| 145 } | |
| 146 return AddKeyImpl(nigori.release()); | |
| 147 } | |
| 148 | |
| 149 bool Cryptographer::AddKeyFromBootstrapToken( | |
| 150 const std::string restored_bootstrap_token) { | |
| 151 // Create the new Nigori and make it the default encryptor. | |
| 152 scoped_ptr<Nigori> nigori(UnpackBootstrapToken(restored_bootstrap_token)); | |
| 153 if (!nigori.get()) | |
| 154 return false; | |
| 155 return AddKeyImpl(nigori.release()); | |
| 156 } | |
| 157 | |
| 158 bool Cryptographer::AddKeyImpl(Nigori* initialized_nigori) { | |
| 159 scoped_ptr<Nigori> nigori(initialized_nigori); | |
| 160 std::string name; | |
| 161 if (!nigori->Permute(Nigori::Password, kNigoriKeyName, &name)) { | |
| 162 NOTREACHED(); | |
| 163 return false; | |
| 164 } | |
| 165 nigoris_[name] = make_linked_ptr(nigori.release()); | |
| 166 default_nigori_ = &*nigoris_.find(name); | |
| 167 return true; | |
| 168 } | |
| 169 | |
| 170 bool Cryptographer::SetKeys(const sync_pb::EncryptedData& encrypted) { | |
| 171 DCHECK(CanDecrypt(encrypted)); | |
| 172 | |
| 173 sync_pb::NigoriKeyBag bag; | |
| 174 if (!Decrypt(encrypted, &bag)) { | |
| 175 return false; | |
| 176 } | |
| 177 InstallKeys(encrypted.key_name(), bag); | |
| 178 return true; | |
| 179 } | |
| 180 | |
| 181 void Cryptographer::SetPendingKeys(const sync_pb::EncryptedData& encrypted) { | |
| 182 DCHECK(!CanDecrypt(encrypted)); | |
| 183 pending_keys_.reset(new sync_pb::EncryptedData(encrypted)); | |
| 184 } | |
| 185 | |
| 186 const sync_pb::EncryptedData& Cryptographer::GetPendingKeys() const { | |
| 187 DCHECK(has_pending_keys()); | |
| 188 return *(pending_keys_.get()); | |
| 189 } | |
| 190 | |
| 191 bool Cryptographer::DecryptPendingKeys(const KeyParams& params) { | |
| 192 Nigori nigori; | |
| 193 if (!nigori.InitByDerivation(params.hostname, | |
| 194 params.username, | |
| 195 params.password)) { | |
| 196 NOTREACHED(); | |
| 197 return false; | |
| 198 } | |
| 199 | |
| 200 std::string plaintext; | |
| 201 if (!nigori.Decrypt(pending_keys_->blob(), &plaintext)) | |
| 202 return false; | |
| 203 | |
| 204 sync_pb::NigoriKeyBag bag; | |
| 205 if (!bag.ParseFromString(plaintext)) { | |
| 206 NOTREACHED(); | |
| 207 return false; | |
| 208 } | |
| 209 InstallKeys(pending_keys_->key_name(), bag); | |
| 210 pending_keys_.reset(); | |
| 211 return true; | |
| 212 } | |
| 213 | |
| 214 bool Cryptographer::GetBootstrapToken(std::string* token) const { | |
| 215 DCHECK(token); | |
| 216 if (!is_initialized()) | |
| 217 return false; | |
| 218 | |
| 219 return PackBootstrapToken(default_nigori_->second.get(), token); | |
| 220 } | |
| 221 | |
| 222 bool Cryptographer::PackBootstrapToken(const Nigori* nigori, | |
| 223 std::string* pack_into) const { | |
| 224 DCHECK(pack_into); | |
| 225 DCHECK(nigori); | |
| 226 | |
| 227 sync_pb::NigoriKey key; | |
| 228 if (!nigori->ExportKeys(key.mutable_user_key(), | |
| 229 key.mutable_encryption_key(), | |
| 230 key.mutable_mac_key())) { | |
| 231 NOTREACHED(); | |
| 232 return false; | |
| 233 } | |
| 234 | |
| 235 std::string unencrypted_token; | |
| 236 if (!key.SerializeToString(&unencrypted_token)) { | |
| 237 NOTREACHED(); | |
| 238 return false; | |
| 239 } | |
| 240 | |
| 241 std::string encrypted_token; | |
| 242 if (!encryptor_->EncryptString(unencrypted_token, &encrypted_token)) { | |
| 243 NOTREACHED(); | |
| 244 return false; | |
| 245 } | |
| 246 | |
| 247 if (!base::Base64Encode(encrypted_token, pack_into)) { | |
| 248 NOTREACHED(); | |
| 249 return false; | |
| 250 } | |
| 251 return true; | |
| 252 } | |
| 253 | |
| 254 Nigori* Cryptographer::UnpackBootstrapToken(const std::string& token) const { | |
| 255 if (token.empty()) | |
| 256 return NULL; | |
| 257 | |
| 258 std::string encrypted_data; | |
| 259 if (!base::Base64Decode(token, &encrypted_data)) { | |
| 260 DLOG(WARNING) << "Could not decode token."; | |
| 261 return NULL; | |
| 262 } | |
| 263 | |
| 264 std::string unencrypted_token; | |
| 265 if (!encryptor_->DecryptString(encrypted_data, &unencrypted_token)) { | |
| 266 DLOG(WARNING) << "Decryption of bootstrap token failed."; | |
| 267 return NULL; | |
| 268 } | |
| 269 | |
| 270 sync_pb::NigoriKey key; | |
| 271 if (!key.ParseFromString(unencrypted_token)) { | |
| 272 DLOG(WARNING) << "Parsing of bootstrap token failed."; | |
| 273 return NULL; | |
| 274 } | |
| 275 | |
| 276 scoped_ptr<Nigori> nigori(new Nigori); | |
| 277 if (!nigori->InitByImport(key.user_key(), key.encryption_key(), | |
| 278 key.mac_key())) { | |
| 279 NOTREACHED(); | |
| 280 return NULL; | |
| 281 } | |
| 282 | |
| 283 return nigori.release(); | |
| 284 } | |
| 285 | |
| 286 Cryptographer::UpdateResult Cryptographer::Update( | |
| 287 const sync_pb::NigoriSpecifics& nigori) { | |
| 288 UpdateEncryptedTypesFromNigori(nigori); | |
| 289 if (!nigori.encrypted().blob().empty()) { | |
| 290 if (CanDecrypt(nigori.encrypted())) { | |
| 291 SetKeys(nigori.encrypted()); | |
| 292 return Cryptographer::SUCCESS; | |
| 293 } else { | |
| 294 SetPendingKeys(nigori.encrypted()); | |
| 295 return Cryptographer::NEEDS_PASSPHRASE; | |
| 296 } | |
| 297 } | |
| 298 return Cryptographer::SUCCESS; | |
| 299 } | |
| 300 | |
| 301 // Static | |
| 302 syncable::ModelTypeSet Cryptographer::SensitiveTypes() { | |
| 303 // Both of these have their own encryption schemes, but we include them | |
| 304 // anyways. | |
| 305 syncable::ModelTypeSet types; | |
| 306 types.Put(syncable::PASSWORDS); | |
| 307 types.Put(syncable::NIGORI); | |
| 308 return types; | |
| 309 } | |
| 310 | |
| 311 void Cryptographer::UpdateEncryptedTypesFromNigori( | |
| 312 const sync_pb::NigoriSpecifics& nigori) { | |
| 313 if (nigori.encrypt_everything()) { | |
| 314 set_encrypt_everything(); | |
| 315 return; | |
| 316 } | |
| 317 | |
| 318 syncable::ModelTypeSet encrypted_types(SensitiveTypes()); | |
| 319 if (nigori.encrypt_bookmarks()) | |
| 320 encrypted_types.Put(syncable::BOOKMARKS); | |
| 321 if (nigori.encrypt_preferences()) | |
| 322 encrypted_types.Put(syncable::PREFERENCES); | |
| 323 if (nigori.encrypt_autofill_profile()) | |
| 324 encrypted_types.Put(syncable::AUTOFILL_PROFILE); | |
| 325 if (nigori.encrypt_autofill()) | |
| 326 encrypted_types.Put(syncable::AUTOFILL); | |
| 327 if (nigori.encrypt_themes()) | |
| 328 encrypted_types.Put(syncable::THEMES); | |
| 329 if (nigori.encrypt_typed_urls()) | |
| 330 encrypted_types.Put(syncable::TYPED_URLS); | |
| 331 if (nigori.encrypt_extension_settings()) | |
| 332 encrypted_types.Put(syncable::EXTENSION_SETTINGS); | |
| 333 if (nigori.encrypt_extensions()) | |
| 334 encrypted_types.Put(syncable::EXTENSIONS); | |
| 335 if (nigori.encrypt_search_engines()) | |
| 336 encrypted_types.Put(syncable::SEARCH_ENGINES); | |
| 337 if (nigori.encrypt_sessions()) | |
| 338 encrypted_types.Put(syncable::SESSIONS); | |
| 339 if (nigori.encrypt_app_settings()) | |
| 340 encrypted_types.Put(syncable::APP_SETTINGS); | |
| 341 if (nigori.encrypt_apps()) | |
| 342 encrypted_types.Put(syncable::APPS); | |
| 343 if (nigori.encrypt_app_notifications()) | |
| 344 encrypted_types.Put(syncable::APP_NOTIFICATIONS); | |
| 345 | |
| 346 // Note: the initial version with encryption did not support the | |
| 347 // encrypt_everything field. If anything more than the sensitive types were | |
| 348 // encrypted, it meant we were encrypting everything. | |
| 349 if (!nigori.has_encrypt_everything() && | |
| 350 !Difference(encrypted_types, SensitiveTypes()).Empty()) { | |
| 351 set_encrypt_everything(); | |
| 352 return; | |
| 353 } | |
| 354 | |
| 355 MergeEncryptedTypes(encrypted_types); | |
| 356 } | |
| 357 | |
| 358 void Cryptographer::UpdateNigoriFromEncryptedTypes( | |
| 359 sync_pb::NigoriSpecifics* nigori) const { | |
| 360 nigori->set_encrypt_everything(encrypt_everything_); | |
| 361 nigori->set_encrypt_bookmarks( | |
| 362 encrypted_types_.Has(syncable::BOOKMARKS)); | |
| 363 nigori->set_encrypt_preferences( | |
| 364 encrypted_types_.Has(syncable::PREFERENCES)); | |
| 365 nigori->set_encrypt_autofill_profile( | |
| 366 encrypted_types_.Has(syncable::AUTOFILL_PROFILE)); | |
| 367 nigori->set_encrypt_autofill(encrypted_types_.Has(syncable::AUTOFILL)); | |
| 368 nigori->set_encrypt_themes(encrypted_types_.Has(syncable::THEMES)); | |
| 369 nigori->set_encrypt_typed_urls( | |
| 370 encrypted_types_.Has(syncable::TYPED_URLS)); | |
| 371 nigori->set_encrypt_extension_settings( | |
| 372 encrypted_types_.Has(syncable::EXTENSION_SETTINGS)); | |
| 373 nigori->set_encrypt_extensions( | |
| 374 encrypted_types_.Has(syncable::EXTENSIONS)); | |
| 375 nigori->set_encrypt_search_engines( | |
| 376 encrypted_types_.Has(syncable::SEARCH_ENGINES)); | |
| 377 nigori->set_encrypt_sessions(encrypted_types_.Has(syncable::SESSIONS)); | |
| 378 nigori->set_encrypt_app_settings( | |
| 379 encrypted_types_.Has(syncable::APP_SETTINGS)); | |
| 380 nigori->set_encrypt_apps(encrypted_types_.Has(syncable::APPS)); | |
| 381 nigori->set_encrypt_app_notifications( | |
| 382 encrypted_types_.Has(syncable::APP_NOTIFICATIONS)); | |
| 383 } | |
| 384 | |
| 385 void Cryptographer::set_encrypt_everything() { | |
| 386 if (encrypt_everything_) { | |
| 387 DCHECK(encrypted_types_.Equals(syncable::ModelTypeSet::All())); | |
| 388 return; | |
| 389 } | |
| 390 encrypt_everything_ = true; | |
| 391 // Change |encrypted_types_| directly to avoid sending more than one | |
| 392 // notification. | |
| 393 encrypted_types_ = syncable::ModelTypeSet::All(); | |
| 394 EmitEncryptedTypesChangedNotification(); | |
| 395 } | |
| 396 | |
| 397 bool Cryptographer::encrypt_everything() const { | |
| 398 return encrypt_everything_; | |
| 399 } | |
| 400 | |
| 401 syncable::ModelTypeSet Cryptographer::GetEncryptedTypes() const { | |
| 402 return encrypted_types_; | |
| 403 } | |
| 404 | |
| 405 void Cryptographer::MergeEncryptedTypesForTest( | |
| 406 syncable::ModelTypeSet encrypted_types) { | |
| 407 MergeEncryptedTypes(encrypted_types); | |
| 408 } | |
| 409 | |
| 410 void Cryptographer::MergeEncryptedTypes( | |
| 411 syncable::ModelTypeSet encrypted_types) { | |
| 412 if (encrypted_types_.HasAll(encrypted_types)) { | |
| 413 return; | |
| 414 } | |
| 415 encrypted_types_ = encrypted_types; | |
| 416 EmitEncryptedTypesChangedNotification(); | |
| 417 } | |
| 418 | |
| 419 void Cryptographer::EmitEncryptedTypesChangedNotification() { | |
| 420 FOR_EACH_OBSERVER( | |
| 421 Observer, observers_, | |
| 422 OnEncryptedTypesChanged(encrypted_types_, encrypt_everything_)); | |
| 423 } | |
| 424 | |
| 425 void Cryptographer::InstallKeys(const std::string& default_key_name, | |
| 426 const sync_pb::NigoriKeyBag& bag) { | |
| 427 int key_size = bag.key_size(); | |
| 428 for (int i = 0; i < key_size; ++i) { | |
| 429 const sync_pb::NigoriKey key = bag.key(i); | |
| 430 // Only use this key if we don't already know about it. | |
| 431 if (nigoris_.end() == nigoris_.find(key.name())) { | |
| 432 scoped_ptr<Nigori> new_nigori(new Nigori); | |
| 433 if (!new_nigori->InitByImport(key.user_key(), | |
| 434 key.encryption_key(), | |
| 435 key.mac_key())) { | |
| 436 NOTREACHED(); | |
| 437 continue; | |
| 438 } | |
| 439 nigoris_[key.name()] = make_linked_ptr(new_nigori.release()); | |
| 440 } | |
| 441 } | |
| 442 DCHECK(nigoris_.end() != nigoris_.find(default_key_name)); | |
| 443 default_nigori_ = &*nigoris_.find(default_key_name); | |
| 444 } | |
| 445 | |
| 446 } // namespace browser_sync | |
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Chromium Code Reviews
Issue 9699057:
[Sync] Move 'sync' target to sync/ (Closed)
Base URL: svn://svn.chromium.org/chrome/trunk/src