server/internal-encryption.cpp

   1 /*
   2  *  Copyright (c) 2015-2017 Samsung Electronics Co., Ltd All Rights Reserved
   3  *
   4  *  Licensed under the Apache License, Version 2.0 (the "License");
   5  *  you may not use this file except in compliance with the License.
   6  *  You may obtain a copy of the License at
   7  *
   8  *      http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  *  Unless required by applicable law or agreed to in writing, software
  11  *  distributed under the License is distributed on an "AS IS" BASIS,
  12  *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  *  See the License for the specific language governing permissions and
  14  *  limitations under the License
  15  */
  16 #include <set>
  17 #include <algorithm>
  18 #include <memory>
  19
  20 #include <fcntl.h>
  21 #include <signal.h>
  22 #include <unistd.h>
  23 #include <sys/mount.h>
  24 #include <sys/reboot.h>
  25 #include <limits.h>
  26 #include <stdlib.h>
  27 #include <string.h>
  28
  29 #include <vconf.h>
  30 #include <tzplatform_config.h>
  31 #include <klay/process.h>
  32 #include <klay/file-user.h>
  33 #include <klay/filesystem.h>
  34 #include <klay/dbus/connection.h>
  35 #include <klay/error.h>
  36
  37 #include "misc.h"
  38 #include "logger.h"
  39 #include "progress-bar.h"
  40
  41 #include "internal-encryption.h"
  42
  43 namespace ode {
  44
  45 namespace {
  46
  47 const char *INTERNAL_DEV_PATH   = "/dev/disk/by-partlabel";
  48 const char *INTERNAL_DEV_NAME   = "USER";
  49 const char *INTERNAL_PATH               = "/opt/usr";
  50
  51 const char *PRIVILEGE_PLATFORM  = "http://tizen.org/privilege/internal/default/platform";
  52
  53 // TODO: see recovery()
  54 const std::string PROG_FACTORY_RESET = "/usr/bin/dbus-send";
  55 const std::vector<std::string> wipeCommand = {
  56     PROG_FACTORY_RESET,
  57     "--system",
  58     "--type=signal",
  59     "--print-reply",
  60     "--dest=com.samsung.factoryreset",
  61     "/com/samsung/factoryreset",
  62     "com.samsung.factoryreset.start.setting"
  63 };
  64
  65 std::string findDevPath()
  66 {
  67         std::string source = INTERNAL_DEV_PATH + std::string("/") + INTERNAL_DEV_NAME;
  68         try {
  69                 runtime::DirectoryIterator iter(INTERNAL_DEV_PATH), end;
  70
  71                 while (iter != end) {
  72                         const std::string& path = (*iter).getPath();
  73                         std::string name = path.substr(path.rfind('/') + 1);
  74                         std::string upper;
  75                         upper.reserve(name.size());
  76                         for (char c : name) {
  77                                 upper += std::toupper(c);
  78                         }
  79                         if (upper.compare(0, strlen(INTERNAL_DEV_NAME), INTERNAL_DEV_NAME) == 0) {
  80                                 source = path;
  81                                 break;
  82                         }
  83                         ++iter;
  84                 }
  85         } catch (runtime::Exception &e) {}
  86
  87         char *dev = ::realpath(source.c_str(), NULL);
  88         if (dev == NULL) {
  89                 ERROR(SINK, "Failed to get device path.");
  90                 return "";
  91         }
  92
  93         std::string devPath(dev);
  94         free(dev);
  95
  96         return devPath;
  97 }
  98
  99 void stopKnownSystemdServices()
 100 {
 101         std::vector<std::string> knownSystemdServices;
 102         dbus::Connection& systemDBus = dbus::Connection::getSystem();
 103         dbus::VariantIterator iter;
 104
 105         systemDBus.methodcall("org.freedesktop.systemd1",
 106                                                         "/org/freedesktop/systemd1",
 107                                                         "org.freedesktop.systemd1.Manager",
 108                                                         "ListUnits",
 109                                                         -1, "(a(ssssssouso))", "")
 110                                                                 .get("(a(ssssssouso))", &iter);
 111
 112         while (1) {
 113                 unsigned int dataUint;
 114                 char *dataStr[9];
 115                 int ret;
 116
 117                 ret = iter.get("(ssssssouso)", dataStr, dataStr + 1, dataStr + 2,
 118                                                 dataStr + 3, dataStr + 4, dataStr + 5,
 119                                                 dataStr + 6, &dataUint, dataStr + 7,
 120                                                 dataStr + 8);
 121
 122                 if (!ret) {
 123                         break;
 124                 }
 125
 126                 std::string service(dataStr[0]);
 127                 if (service.compare(0, 5, "user@") == 0 ||
 128                         service == "tlm.service" ||
 129                         service == "resourced.service") {
 130                         knownSystemdServices.push_back(service);
 131                 }
 132         }
 133
 134         for (const std::string& service : knownSystemdServices) {
 135                 INFO(SINK, "Stopping service: " + service);
 136                 systemDBus.methodcall("org.freedesktop.systemd1",
 137                                                                 "/org/freedesktop/systemd1",
 138                                                                 "org.freedesktop.systemd1.Manager",
 139                                                                 "StopUnit",
 140                                                                 -1, "", "(ss)", service.c_str(), "flush");
 141         }
 142
 143         sleep(1);
 144 }
 145
 146 void stopDependedSystemdServices()
 147 {
 148         dbus::Connection& systemDBus = dbus::Connection::getSystem();
 149         std::set<std::string> servicesToStop;
 150
 151         for (pid_t pid : runtime::FileUser::getList(INTERNAL_PATH, true)) {
 152                 try {
 153                         char *service;
 154                         systemDBus.methodcall("org.freedesktop.systemd1",
 155                                                                         "/org/freedesktop/systemd1",
 156                                                                         "org.freedesktop.systemd1.Manager",
 157                                                                         "GetUnitByPID",
 158                                                                         -1, "(o)", "(u)", (unsigned int)pid)
 159                                                                                 .get("(o)", &service);
 160                         servicesToStop.insert(service);
 161                 } catch (runtime::Exception &e) {
 162                         INFO(SINK, "Killing process: " + std::to_string(pid));
 163                         ::kill(pid, SIGKILL);
 164                 }
 165         }
 166
 167         for (const std::string& service : servicesToStop) {
 168                 INFO(SINK, "Stopping service: " + service);
 169                 systemDBus.methodcall("org.freedesktop.systemd1",
 170                                                                 service,
 171                                                                 "org.freedesktop.systemd1.Unit",
 172                                                                 "Stop",
 173                                                                 -1, "", "(s)", "flush");
 174         }
 175 }
 176
 177 void showProgressUI(const std::string type)
 178 {
 179         ::tzplatform_set_user(::tzplatform_getuid(TZ_SYS_DEFAULT_USER));
 180         std::string defaultUserHome(::tzplatform_getenv(TZ_USER_HOME));
 181         ::tzplatform_reset_user();
 182
 183         try {
 184                 runtime::File shareDirectory("/opt/home/root/share");
 185                 if (!shareDirectory.exists()) {
 186                         shareDirectory.makeDirectory(true);
 187                 }
 188
 189                 runtime::File elmConfigDir(shareDirectory.getPath() + "/.elementary");
 190                 if (!elmConfigDir.exists()) {
 191                         runtime::File defaultElmConfigDir(defaultUserHome + "/share/.elementary");
 192                         defaultElmConfigDir.copyTo(shareDirectory.getPath());
 193                 }
 194         } catch (runtime::Exception &e) {
 195                 ERROR(SINK, "Failed to set up elm configuration: " + std::string(e.what()));
 196         }
 197
 198         std::vector<std::string> args = {
 199                 "ode", "progress", type, "Internal"
 200         };
 201
 202         runtime::Process proc("/usr/bin/ode", args);
 203         proc.execute();
 204 }
 205
 206 unsigned int getOptions()
 207 {
 208         unsigned int result = 0;
 209         int value;
 210
 211         value = 0;
 212         ::vconf_get_bool(VCONFKEY_ODE_FAST_ENCRYPTION, &value);
 213         if (value) {
 214                 result |= InternalEncryption::Option::IncludeUnusedRegion;
 215         }
 216
 217         return result;
 218 }
 219
 220 void setOptions(unsigned int options)
 221 {
 222         bool value;
 223
 224         if (options & InternalEncryption::Option::IncludeUnusedRegion) {
 225                 value = true;
 226         } else {
 227                 value = false;
 228         }
 229         ::vconf_set_bool(VCONFKEY_ODE_FAST_ENCRYPTION, value);
 230 }
 231
 232 }
 233
 234 InternalEncryptionServer::InternalEncryptionServer(ServerContext& srv) :
 235         server(srv)
 236 {
 237         server.expose(this, PRIVILEGE_PLATFORM, (int)(InternalEncryptionServer::setMountPassword)(std::string));
 238         server.expose(this, PRIVILEGE_PLATFORM, (int)(InternalEncryptionServer::mount)());
 239         server.expose(this, PRIVILEGE_PLATFORM, (int)(InternalEncryptionServer::umount)());
 240         server.expose(this, PRIVILEGE_PLATFORM, (int)(InternalEncryptionServer::encrypt)(std::string, unsigned int));
 241         server.expose(this, PRIVILEGE_PLATFORM, (int)(InternalEncryptionServer::decrypt)(std::string));
 242         server.expose(this, "", (int)(InternalEncryptionServer::isPasswordInitialized)());
 243         server.expose(this, PRIVILEGE_PLATFORM, (int)(InternalEncryptionServer::initPassword)(std::string));
 244         server.expose(this, PRIVILEGE_PLATFORM, (int)(InternalEncryptionServer::cleanPassword)(std::string));
 245         server.expose(this, PRIVILEGE_PLATFORM, (int)(InternalEncryptionServer::changePassword)(std::string, std::string));
 246         server.expose(this, PRIVILEGE_PLATFORM, (int)(InternalEncryptionServer::verifyPassword)(std::string));
 247         server.expose(this, "", (int)(InternalEncryptionServer::getState)());
 248         server.expose(this, "", (unsigned int)(InternalEncryptionServer::getSupportedOptions)());
 249
 250         server.createNotification("InternalEncryptionServer::mount");
 251
 252         std::string source = findDevPath();
 253
 254         engine.reset(new INTERNAL_ENGINE(
 255                 source, INTERNAL_PATH,
 256                 ProgressBar([](int v) {
 257                         ::vconf_set_str(VCONFKEY_ODE_ENCRYPT_PROGRESS,
 258                                                         std::to_string(v).c_str());
 259                 })
 260         ));
 261 }
 262
 263 InternalEncryptionServer::~InternalEncryptionServer()
 264 {
 265 }
 266
 267 int InternalEncryptionServer::setMountPassword(const std::string& password)
 268 {
 269         KeyManager::data pwData(password.begin(), password.end());
 270         KeyManager keyManager(engine->getKeyMeta());
 271         if (!keyManager.verifyPassword(pwData)) {
 272                 ERROR(SINK, "Wrong password passed.");
 273                 return -2;
 274         }
 275
 276         mountKey = keyManager.getMasterKey(pwData);
 277
 278         return 0;
 279 }
 280
 281 int InternalEncryptionServer::mount()
 282 {
 283         if (mountKey.empty()) {
 284                 ERROR(SINK, "You need to call set_mount_password() first.");
 285                 return -1;
 286         }
 287
 288         KeyManager::data key = mountKey;
 289         mountKey.clear();
 290
 291         if (getState() != State::Encrypted) {
 292                 INFO(SINK, "Cannot mount, SD partition's state incorrect.");
 293                 return -1;
 294         }
 295
 296     if (engine->isMounted()) {
 297                 INFO(SINK, "Partition already mounted.");
 298                 return 0;
 299         }
 300
 301         INFO(SINK, "Mounting internal storage.");
 302         try {
 303                 engine->mount(key, getOptions());
 304
 305                 server.notify("InternalEncryptionServer::mount");
 306
 307                 runtime::File("/tmp/.lazy_mount").create(O_WRONLY);
 308                 runtime::File("/tmp/.unlock_mnt").create(O_WRONLY);
 309         } catch (runtime::Exception &e) {
 310                 ERROR(SINK, "Mount failed: " + std::string(e.what()));
 311                 return -1;
 312         }
 313
 314         return 0;
 315 }
 316
 317 int InternalEncryptionServer::umount()
 318 {
 319         if (getState() != State::Encrypted) {
 320                 ERROR(SINK, "Cannot umount, partition's state incorrect.");
 321                 return -1;
 322         }
 323
 324         if (!engine->isMounted()) {
 325                 INFO(SINK, "Partition already umounted.");
 326                 return 0;
 327         }
 328
 329         INFO(SINK, "Closing all processes using internal storage.");
 330         try {
 331                 stopDependedSystemdServices();
 332                 INFO(SINK, "Umounting internal storage.");
 333                 engine->umount();
 334         } catch (runtime::Exception &e) {
 335                 ERROR(SINK, "Umount failed: " + std::string(e.what()));
 336                 return -1;
 337         }
 338
 339         return 0;
 340 }
 341
 342 int InternalEncryptionServer::encrypt(const std::string& password, unsigned int options)
 343 {
 344         if (getState() != State::Unencrypted) {
 345                 ERROR(SINK, "Cannot encrypt, partition's state incorrect.");
 346                 return -1;
 347         }
 348
 349         KeyManager::data pwData(password.begin(), password.end());
 350         KeyManager keyManager(engine->getKeyMeta());
 351
 352         if (!keyManager.verifyPassword(pwData)) {
 353                 ERROR(SINK, "Wrong password passed.");
 354                 return -2;
 355         }
 356
 357         KeyManager::data MasterKey = keyManager.getMasterKey(pwData);
 358         auto encryptWorker = [MasterKey, options, this]() {
 359                 try {
 360                         std::string source = engine->getSource();
 361                         std::string mntPath = findMntPath(source);
 362
 363                         if (!mntPath.empty()) {
 364                                 INFO(SINK, "Closing all known systemd services that might be using internal storage.");
 365                                 stopKnownSystemdServices();
 366                                 INFO(SINK, "Closing all processes using internal storage.");
 367                                 stopDependedSystemdServices();
 368                         }
 369
 370                         while (!mntPath.empty()) {
 371                                 INFO(SINK, "Umounting internal storage.");
 372                                 while (::umount(mntPath.c_str()) == -1) {
 373                                         if (errno != EBUSY) {
 374                                                 throw runtime::Exception("Umount error: " + runtime::GetSystemErrorMessage());
 375                                         }
 376                                         stopDependedSystemdServices();
 377                                 }
 378                                 mntPath = findMntPath(source);
 379                         }
 380
 381                         showProgressUI("Encrypting");
 382
 383                         INFO(SINK, "Encryption started.");
 384                         ::vconf_set_str(VCONFKEY_ODE_CRYPTO_STATE, "error_partially_encrypted");
 385                         engine->encrypt(MasterKey, options);
 386                         setOptions(options & getSupportedOptions());
 387
 388                         INFO(SINK, "Encryption completed.");
 389                         ::vconf_set_str(VCONFKEY_ODE_CRYPTO_STATE, "encrypted");
 390                         server.notify("InternalEncryptionServer::mount");
 391
 392                         INFO(SINK, "Syncing disk and rebooting.");
 393                         ::sync();
 394                         ::reboot(RB_AUTOBOOT);
 395                 } catch (runtime::Exception &e) {
 396                         ERROR(SINK, "Encryption failed: " + std::string(e.what()));
 397                 }
 398         };
 399
 400         std::thread asyncWork(encryptWorker);
 401         asyncWork.detach();
 402
 403         return 0;
 404 }
 405
 406 int InternalEncryptionServer::decrypt(const std::string& password)
 407 {
 408         if (getState() != State::Encrypted) {
 409                 ERROR(SINK, "Cannot decrypt, partition's state incorrect.");
 410                 return -1;
 411         }
 412
 413         KeyManager::data pwData(password.begin(), password.end());
 414         KeyManager keyManager(engine->getKeyMeta());
 415
 416         if (!keyManager.verifyPassword(pwData)) {
 417                 ERROR(SINK, "Wrong password passed.");
 418                 return -2;
 419         }
 420
 421         KeyManager::data MasterKey = keyManager.getMasterKey(pwData);
 422         auto decryptWorker = [MasterKey, this]() {
 423                 try {
 424                         if (engine->isMounted()) {
 425                                 INFO(SINK, "Closing all known systemd services that might be using internal storage.");
 426                                 stopKnownSystemdServices();
 427                                 INFO(SINK, "Closing all processes using internal storage.");
 428                                 stopDependedSystemdServices();
 429
 430                                 INFO(SINK, "Umounting internal storage.");
 431                                 while (1) {
 432                                         try {
 433                                                 engine->umount();
 434                                                 break;
 435                                         } catch (runtime::Exception& e) {
 436                                                 stopDependedSystemdServices();
 437                                         }
 438                                 }
 439                         }
 440
 441                         showProgressUI("Decrypting");
 442
 443                         INFO(SINK, "Decryption started.");
 444                         ::vconf_set_str(VCONFKEY_ODE_CRYPTO_STATE, "error_partially_encrypted");
 445                         engine->decrypt(MasterKey, getOptions());
 446
 447                         INFO(SINK, "Decryption complete.");
 448                         ::vconf_set_str(VCONFKEY_ODE_CRYPTO_STATE, "unencrypted");
 449
 450                         INFO(SINK, "Syncing disk and rebooting.");
 451                         ::sync();
 452                         ::reboot(RB_AUTOBOOT);
 453                 } catch (runtime::Exception &e) {
 454                         ERROR(SINK, "Decryption failed: " + std::string(e.what()));
 455                 }
 456         };
 457
 458         std::thread asyncWork(decryptWorker);
 459         asyncWork.detach();
 460
 461         return 0;
 462 }
 463
 464 int InternalEncryptionServer::recovery()
 465 {
 466         if (getState() != State::Unencrypted) {
 467                 return -1;
 468         }
 469
 470         //TODO
 471         runtime::Process proc(PROG_FACTORY_RESET, wipeCommand);
 472         if (proc.execute() == -1) {
 473                 ERROR(SINK, "Failed to launch factory-reset");
 474                 return -2;
 475         }
 476
 477         return 0;
 478 }
 479
 480 int InternalEncryptionServer::isPasswordInitialized()
 481 {
 482         if (engine->isKeyMetaSet()) {
 483                 return 1;
 484         }
 485         return 0;
 486 }
 487
 488 int InternalEncryptionServer::initPassword(const std::string& password)
 489 {
 490         KeyManager::data pwData(password.begin(), password.end());
 491         KeyManager keyManager;
 492
 493         keyManager.initPassword(pwData);
 494         engine->setKeyMeta(keyManager.serialize());
 495         return 0;
 496 }
 497
 498 int InternalEncryptionServer::cleanPassword(const std::string& password)
 499 {
 500         KeyManager::data pwData(password.begin(), password.end());
 501         KeyManager keyManager(engine->getKeyMeta());
 502
 503         if (!keyManager.verifyPassword(pwData)) {
 504                 ERROR(SINK, "Wrong password passed.");
 505                 return -2;
 506         }
 507
 508         engine->clearKeyMeta();
 509         return 0;
 510 }
 511
 512 int InternalEncryptionServer::changePassword(const std::string& oldPassword,
 513                                                                                 const std::string& newPassword)
 514 {
 515         KeyManager::data oldPwData(oldPassword.begin(), oldPassword.end());
 516         KeyManager::data newPwData(newPassword.begin(), newPassword.end());
 517         KeyManager keyManager(engine->getKeyMeta());
 518
 519         if (!keyManager.verifyPassword(oldPwData)) {
 520                 ERROR(SINK, "Wrong password passed.");
 521                 return -2;
 522         }
 523
 524         keyManager.changePassword(oldPwData, newPwData);
 525         engine->setKeyMeta(keyManager.serialize());
 526
 527         return 0;
 528 }
 529
 530 int InternalEncryptionServer::verifyPassword(const std::string& password)
 531 {
 532         KeyManager::data pwData(password.begin(), password.end());
 533         KeyManager keyManager(engine->getKeyMeta());
 534
 535         if (keyManager.verifyPassword(pwData)) {
 536                 return 1;
 537         }
 538         return 0;
 539 }
 540
 541 int InternalEncryptionServer::getState()
 542 {
 543         char *value = ::vconf_get_str(VCONFKEY_ODE_CRYPTO_STATE);
 544         if (value == NULL) {
 545                 throw runtime::Exception("Failed to get vconf value.");
 546         }
 547
 548         std::string valueStr(value);
 549         free(value);
 550
 551         if (valueStr == "encrypted") {
 552                 return State::Encrypted;
 553         } else if (valueStr == "unencrypted") {
 554                 return State::Unencrypted;
 555         } else {
 556                 return State::Corrupted;
 557         }
 558
 559         return 0;
 560 }
 561
 562 unsigned int InternalEncryptionServer::getSupportedOptions()
 563 {
 564         return engine->getSupportedOptions();
 565 }
 566
 567 } // namespace ode