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 #include <mutex>
  20 #include <condition_variable>
  21 #include <list>
  22
  23 #include <fstream>
  24 #include <fcntl.h>
  25 #include <signal.h>
  26 #include <unistd.h>
  27 #include <sys/mount.h>
  28 #include <sys/reboot.h>
  29 #include <limits.h>
  30 #include <stdlib.h>
  31 #include <string.h>
  32
  33 #include <vconf.h>
  34 #include <tzplatform_config.h>
  35 #include <klay/process.h>
  36 #include <klay/file-user.h>
  37 #include <klay/filesystem.h>
  38 #include <klay/dbus/connection.h>
  39 #include <klay/error.h>
  40
  41 #include "misc.h"
  42 #include "logger.h"
  43 #include "progress-bar.h"
  44 #include "rmi/common.h"
  45
  46 #include "ext4-tool.h"
  47 #include "internal-encryption.h"
  48 #include "internal-encryption-common.h"
  49
  50 namespace ode {
  51
  52 namespace {
  53
  54 const char *PRIVILEGE_PLATFORM  = "http://tizen.org/privilege/internal/default/platform";
  55
  56 // watches systemd jobs
  57 class JobWatch {
  58 public:
  59         explicit JobWatch(dbus::Connection& systemDBus);
  60         ~JobWatch();
  61
  62         bool waitForJob(const std::string& job);
  63
  64 private:
  65         void jobRemoved(const dbus::Variant& parameters);
  66
  67         struct Job {
  68                 Job(uint32_t id,
  69                         const std::string& job,
  70                         const std::string& unit,
  71                         const std::string& result) : id(id), job(job), unit(unit), result(result) {}
  72                 uint32_t id;
  73                 std::string job;
  74                 std::string unit;
  75                 std::string result;
  76         };
  77
  78         dbus::Connection::SubscriptionId id;
  79         dbus::Connection& systemDBus;
  80         std::list<Job> removedJobs;
  81         std::mutex jobsMutex;
  82         std::condition_variable jobsCv;
  83 };
  84
  85 JobWatch::JobWatch(dbus::Connection& systemDBus) : systemDBus(systemDBus) {
  86         auto callback = [this](dbus::Variant parameters) {
  87                 this->jobRemoved(parameters);
  88         };
  89
  90         id = systemDBus.subscribeSignal("",
  91                                                                         "/org/freedesktop/systemd1",
  92                                                                         "org.freedesktop.systemd1.Manager",
  93                                                                         "JobRemoved",
  94                                                                         callback);
  95 }
  96
  97 JobWatch::~JobWatch() {
  98         systemDBus.unsubscribeSignal(id);
  99 }
 100
 101 bool JobWatch::waitForJob(const std::string& job) {
 102         while(true) {
 103                 std::unique_lock<std::mutex> lock(jobsMutex);
 104                 jobsCv.wait(lock, [this]{ return !removedJobs.empty(); });
 105
 106                 while(!removedJobs.empty()) {
 107                         bool match = (removedJobs.front().job == job);
 108                         bool done = (removedJobs.front().result == "done");
 109                         removedJobs.pop_front();
 110                         if (match)
 111                                 return done;
 112                 }
 113         };
 114 }
 115
 116 void JobWatch::jobRemoved(const dbus::Variant& parameters)
 117 {
 118         uint32_t id;
 119         const char* job;
 120         const char* unit;
 121         const char* result;
 122         parameters.get("(uoss)", &id, &job, &unit, &result);
 123         INFO(SINK, "id:" + std::to_string(id) + " job:" + job + " unit:" + unit + " result:" + result);
 124
 125         {
 126                 std::lock_guard<std::mutex> guard(jobsMutex);
 127                 removedJobs.emplace_back(id, job, unit, result);
 128         }
 129         jobsCv.notify_one();
 130 }
 131
 132 void stopKnownSystemdUnits()
 133 {
 134         std::vector<std::string> knownSystemdUnits;
 135         dbus::Connection& systemDBus = dbus::Connection::getSystem();
 136         dbus::VariantIterator iter;
 137
 138         systemDBus.methodcall("org.freedesktop.systemd1",
 139                                                         "/org/freedesktop/systemd1",
 140                                                         "org.freedesktop.systemd1.Manager",
 141                                                         "ListUnits",
 142                                                         -1, "(a(ssssssouso))", "")
 143                                                                 .get("(a(ssssssouso))", &iter);
 144
 145         while (1) {
 146                 unsigned int dataUint;
 147                 char *dataStr[9];
 148                 int ret;
 149
 150                 ret = iter.get("(ssssssouso)", dataStr, dataStr + 1, dataStr + 2,
 151                                                 dataStr + 3, dataStr + 4, dataStr + 5,
 152                                                 dataStr + 6, &dataUint, dataStr + 7,
 153                                                 dataStr + 8);
 154
 155                 if (!ret) {
 156                         break;
 157                 }
 158
 159                 std::string unit(dataStr[0]);
 160                 if (unit == "security-manager.socket" ||
 161                                 unit == "connman.socket") {
 162                         knownSystemdUnits.insert(knownSystemdUnits.begin(), unit);
 163                 } else if (unit.compare(0, 5, "user@") == 0 ||
 164                         unit == "tlm.service" ||
 165                         unit == "resourced.service" ||
 166                         unit == "security-manager.service") {
 167                         knownSystemdUnits.push_back(unit);
 168                 }
 169         }
 170
 171         JobWatch watch(systemDBus);
 172
 173         for (const std::string& unit : knownSystemdUnits) {
 174                 INFO(SINK, "Stopping unit: " + unit);
 175                 const char* job = NULL;
 176                 systemDBus.methodcall("org.freedesktop.systemd1",
 177                                                                 "/org/freedesktop/systemd1",
 178                                                                 "org.freedesktop.systemd1.Manager",
 179                                                                 "StopUnit",
 180                                                                 -1, "(o)", "(ss)", unit.c_str(), "flush").get("(o)", &job);
 181                 INFO(SINK, "Waiting for job: " + std::string(job));
 182                 if (!watch.waitForJob(job))
 183                         throw runtime::Exception("Stopping unit: " + unit + " failed");
 184         }
 185 }
 186
 187 std::string getDecodedPath(const std::string &path, const std::string &prefix)
 188 {
 189         std::string ret = path;
 190         size_t pos = 0;
 191
 192         pos = ret.find(prefix);
 193         if (pos != std::string::npos)
 194                 ret = ret.substr(prefix.size(), ret.size());
 195
 196         pos = 0;
 197         while ((pos = ret.find("_", pos)) != std::string::npos) {
 198                 int a = std::stoi(std::string(1, ret.at(pos+1)), nullptr, 16);
 199                 int b = std::stoi(std::string(1, ret.at(pos+2)), nullptr, 16);
 200                 if (a < 0 || b < 0)
 201                         ret.replace(pos, 3, "_");
 202                 else
 203                         ret.replace(pos, 3, std::string(1, ((a << 4) | b)));
 204                 pos += 1;
 205         }
 206         return ret;
 207 }
 208
 209 void stopDependedSystemdUnits()
 210 {
 211         dbus::Connection& systemDBus = dbus::Connection::getSystem();
 212         std::set<std::string> unitsToStop;
 213         pid_t p = -1;
 214
 215         for (pid_t pid : runtime::FileUser::getList(INTERNAL_PATH, true)) {
 216                 try {
 217                         char *unit = nullptr;
 218                         systemDBus.methodcall("org.freedesktop.systemd1",
 219                                                                         "/org/freedesktop/systemd1",
 220                                                                         "org.freedesktop.systemd1.Manager",
 221                                                                         "GetUnitByPID",
 222                                                                         -1, "(o)", "(u)", (unsigned int)pid)
 223                                                                                 .get("(o)", &unit);
 224
 225                         auto unescapedName = getDecodedPath(unit, "/org/freedesktop/systemd1/unit/");
 226                         if (unescapedName == "samsung-log-mgr.service")
 227                                 p = pid;
 228                         else
 229                                 unitsToStop.insert(unescapedName);
 230                 } catch (runtime::Exception &e) {
 231                         INFO(SINK, "Killing process: " + std::to_string(pid));
 232                         ::kill(pid, SIGKILL);
 233                 }
 234         }
 235
 236         JobWatch watch(systemDBus);
 237
 238         for (const std::string& unit : unitsToStop) {
 239                 INFO(SINK, "Stopping unit: " + unit);
 240                 const char* job = NULL;
 241                 systemDBus.methodcall("org.freedesktop.systemd1",
 242                                                                 "/org/freedesktop/systemd1",
 243                                                                 "org.freedesktop.systemd1.Manager",
 244                                                                 "StopUnit",
 245                                                                 -1, "(o)", "(ss)", unit.c_str(), "flush").get("(o)", &job);
 246                 INFO(SINK, "Waiting for job: " + std::string(job));
 247                 if (!watch.waitForJob(job))
 248                         throw runtime::Exception("Stopping unit: " + unit + " failed");
 249         }
 250
 251         if (::umount2("/sys/fs/cgroup", MNT_FORCE | MNT_DETACH) != 0)
 252                 INFO(SINK, "Failed to unmount cgroup");
 253
 254         if (p != -1)
 255                 ::kill(p, SIGKILL);
 256 }
 257
 258 void showProgressUI(const std::string type)
 259 {
 260         dbus::Connection& systemDBus = dbus::Connection::getSystem();
 261         std::string unit("ode-progress-ui@"+type+".service");
 262
 263         JobWatch watch(systemDBus);
 264         INFO(SINK, "Start unit: " + unit);
 265
 266         const char* job = NULL;
 267         systemDBus.methodcall("org.freedesktop.systemd1",
 268                                                         "/org/freedesktop/systemd1",
 269                                                         "org.freedesktop.systemd1.Manager",
 270                                                         "StartUnit",
 271                                                         -1, "(o)", "(ss)", unit.c_str(), "replace").get("(o)", &job);
 272
 273         INFO(SINK, "Waiting for job: " + std::string(job));
 274         if (!watch.waitForJob(job))
 275                 throw runtime::Exception("Starting unit: " + unit + " failed");
 276 }
 277
 278 unsigned int getOptions()
 279 {
 280         unsigned int result = 0;
 281         int value;
 282
 283         value = 0;
 284         ::vconf_get_bool(VCONFKEY_ODE_FAST_ENCRYPTION, &value);
 285         if (value) {
 286                 result |= InternalEncryption::Option::IncludeUnusedRegion;
 287         }
 288
 289         return result;
 290 }
 291
 292 void setOptions(unsigned int options)
 293 {
 294         bool value;
 295
 296         if (options & InternalEncryption::Option::IncludeUnusedRegion) {
 297                 value = true;
 298         } else {
 299                 value = false;
 300         }
 301         ::vconf_set_bool(VCONFKEY_ODE_FAST_ENCRYPTION, value);
 302 }
 303
 304 void unmountInternalStorage(const std::string& source)
 305 {
 306         while(true) {
 307                 auto mntPaths = findMountPointsByDevice(source);
 308                 if(mntPaths.empty())
 309                         break;
 310
 311                 bool unmounted = true;
 312                 for(const auto& path : mntPaths) {
 313                         INFO(SINK, "Unmounting " + path);
 314                         if (::umount(path.c_str()) == -1) {
 315                                 // If it's busy or was already unmounted ignore the error
 316                                 if (errno != EBUSY && errno != EINVAL) {
 317                                         throw runtime::Exception("umount() error: " + runtime::GetSystemErrorMessage());
 318                                 }
 319                                 unmounted = false;
 320                         }
 321                 }
 322                 if (!unmounted)
 323                         stopDependedSystemdUnits();
 324         }
 325 }
 326
 327 }
 328
 329 InternalEncryptionServer::InternalEncryptionServer(ServerContext& srv,
 330                                                                                                    KeyServer& key) :
 331         server(srv),
 332         keyServer(key)
 333 {
 334         server.expose(this, PRIVILEGE_PLATFORM, (int)(InternalEncryptionServer::setMountPassword)(std::string));
 335         server.expose(this, PRIVILEGE_PLATFORM, (int)(InternalEncryptionServer::mount)(std::vector<unsigned char>, unsigned int));
 336         server.expose(this, PRIVILEGE_PLATFORM, (int)(InternalEncryptionServer::umount)());
 337         server.expose(this, PRIVILEGE_PLATFORM, (int)(InternalEncryptionServer::encrypt)(std::string, unsigned int));
 338         server.expose(this, PRIVILEGE_PLATFORM, (int)(InternalEncryptionServer::decrypt)(std::string));
 339         server.expose(this, "", (int)(InternalEncryptionServer::isPasswordInitialized)());
 340         server.expose(this, PRIVILEGE_PLATFORM, (int)(InternalEncryptionServer::recovery)());
 341         server.expose(this, PRIVILEGE_PLATFORM, (int)(InternalEncryptionServer::initPassword)(std::string));
 342         server.expose(this, PRIVILEGE_PLATFORM, (int)(InternalEncryptionServer::cleanPassword)(std::string));
 343         server.expose(this, PRIVILEGE_PLATFORM, (int)(InternalEncryptionServer::changePassword)(std::string, std::string));
 344         server.expose(this, PRIVILEGE_PLATFORM, (int)(InternalEncryptionServer::verifyPassword)(std::string));
 345         server.expose(this, "", (int)(InternalEncryptionServer::getState)());
 346         server.expose(this, "", (unsigned int)(InternalEncryptionServer::getSupportedOptions)());
 347         server.expose(this, "", (std::string)(InternalEncryptionServer::getDevicePath)());
 348
 349         server.createNotification("InternalEncryptionServer::mount");
 350
 351         std::string source = findDevPath();
 352
 353         engine.reset(new INTERNAL_ENGINE(
 354                 source, INTERNAL_PATH,
 355                 ProgressBar([](int v) {
 356                         ::vconf_set_str(VCONFKEY_ODE_ENCRYPT_PROGRESS,
 357                                                         std::to_string(v).c_str());
 358                 })
 359         ));
 360 }
 361
 362 InternalEncryptionServer::~InternalEncryptionServer()
 363 {
 364 }
 365
 366 int InternalEncryptionServer::setMountPassword(const std::string& password)
 367 {
 368         return keyServer.get(engine->getSource(), password, mountKey);
 369 }
 370
 371 int InternalEncryptionServer::mount(const std::vector<unsigned char> &mk, unsigned int options)
 372 {
 373         if (mountKey.empty() && mk.empty()) {
 374                 ERROR(SINK, "You need to set master key first.");
 375                 return error::NoData;
 376         }
 377
 378         BinaryData key = mk.empty() ? mountKey : mk;
 379         mountKey.clear();
 380
 381         if (getState() != State::Encrypted) {
 382                 INFO(SINK, "Cannot mount, SD partition's state incorrect.");
 383                 return error::NoSuchDevice;
 384         }
 385
 386         if (engine->isMounted()) {
 387                 INFO(SINK, "Partition already mounted.");
 388                 return error::None;
 389         }
 390
 391         INFO(SINK, "Mounting internal storage.");
 392         try {
 393                 engine->mount(key, getOptions());
 394
 395                 server.notify("InternalEncryptionServer::mount");
 396
 397                 runtime::File("/tmp/.lazy_mount").create(O_WRONLY);
 398                 runtime::File("/tmp/.unlock_mnt").create(O_WRONLY);
 399         } catch (runtime::Exception &e) {
 400                 ERROR(SINK, "Mount failed: " + std::string(e.what()));
 401                 return error::Unknown;
 402         }
 403
 404         return error::None;
 405 }
 406
 407 int InternalEncryptionServer::umount()
 408 {
 409         if (getState() != State::Encrypted) {
 410                 ERROR(SINK, "Cannot umount, partition's state incorrect.");
 411                 return error::NoSuchDevice;
 412         }
 413
 414         if (!engine->isMounted()) {
 415                 INFO(SINK, "Partition already umounted.");
 416                 return error::None;
 417         }
 418
 419         INFO(SINK, "Closing all processes using internal storage.");
 420         try {
 421                 stopDependedSystemdUnits();
 422                 INFO(SINK, "Umounting internal storage.");
 423                 engine->umount();
 424         } catch (runtime::Exception &e) {
 425                 ERROR(SINK, "Umount failed: " + std::string(e.what()));
 426                 return error::Unknown;
 427         }
 428
 429         return error::None;
 430 }
 431
 432 int InternalEncryptionServer::encrypt(const std::string& password, unsigned int options)
 433 {
 434         if (getState() != State::Unencrypted) {
 435                 ERROR(SINK, "Cannot encrypt, partition's state incorrect.");
 436                 return error::NoSuchDevice;
 437         }
 438
 439         BinaryData masterKey;
 440         int ret = keyServer.get(engine->getSource(), password, masterKey);
 441         if (ret != error::None)
 442                 return ret;
 443
 444         auto encryptWorker = [masterKey, options, this]() {
 445                 try {
 446                         showProgressUI("encrypt");
 447                         ::sleep(1);
 448
 449                         runtime::File file("/opt/etc/.odeprogress");
 450                         file.create(0640);
 451
 452                         INFO(SINK, "Closing all known systemd services that might be using internal storage.");
 453                         stopKnownSystemdUnits();
 454
 455                         std::string source = engine->getSource();
 456                         auto mntPaths = findMountPointsByDevice(source);
 457
 458                         if (!mntPaths.empty()) {
 459                                 INFO(SINK, "Closing all processes using internal storage.");
 460                                 stopDependedSystemdUnits();
 461
 462                                 INFO(SINK, "Unmounting internal storage.");
 463                                 unmountInternalStorage(source);
 464                         }
 465
 466                         INFO(SINK, "Encryption started.");
 467                         ::vconf_set_str(VCONFKEY_ODE_CRYPTO_STATE, "error_partially_encrypted");
 468                         engine->encrypt(masterKey, options);
 469                         setOptions(options & getSupportedOptions());
 470
 471                         INFO(SINK, "Encryption completed.");
 472                         ::vconf_set_str(VCONFKEY_ODE_CRYPTO_STATE, "encrypted");
 473                         server.notify("InternalEncryptionServer::mount");
 474
 475                         file.remove();
 476
 477                         INFO(SINK, "Syncing disk and rebooting.");
 478                         ::sync();
 479                         ::reboot(RB_AUTOBOOT);
 480                 } catch (runtime::Exception &e) {
 481                         ERROR(SINK, "Encryption failed: " + std::string(e.what()));
 482                 }
 483         };
 484
 485         std::thread asyncWork(encryptWorker);
 486         asyncWork.detach();
 487
 488         return error::None;
 489 }
 490
 491 int InternalEncryptionServer::decrypt(const std::string& password)
 492 {
 493         if (getState() != State::Encrypted) {
 494                 ERROR(SINK, "Cannot decrypt, partition's state incorrect.");
 495                 return error::NoSuchDevice;
 496         }
 497
 498         BinaryData masterKey;
 499         int ret = keyServer.get(engine->getSource(), password, masterKey);
 500         if (ret != error::None)
 501                 return ret;
 502
 503         auto decryptWorker = [masterKey, this]() {
 504                 try {
 505                         showProgressUI("decrypt");
 506                         ::sleep(1);
 507
 508                         runtime::File file("/opt/etc/.odeprogress");
 509                         file.create(0640);
 510
 511                         if (engine->isMounted()) {
 512                                 INFO(SINK, "Closing all known systemd services that might be using internal storage.");
 513                                 stopKnownSystemdUnits();
 514                                 INFO(SINK, "Closing all processes using internal storage.");
 515                                 stopDependedSystemdUnits();
 516
 517                                 INFO(SINK, "Umounting internal storage.");
 518                                 while (1) {
 519                                         try {
 520                                                 engine->umount();
 521                                                 break;
 522                                         } catch (runtime::Exception& e) {
 523                                                 stopDependedSystemdUnits();
 524                                         }
 525                                 }
 526                         }
 527
 528                         INFO(SINK, "Decryption started.");
 529                         ::vconf_set_str(VCONFKEY_ODE_CRYPTO_STATE, "error_partially_decrypted");
 530                         engine->decrypt(masterKey, getOptions());
 531
 532                         INFO(SINK, "Decryption complete.");
 533                         ::vconf_set_str(VCONFKEY_ODE_CRYPTO_STATE, "unencrypted");
 534
 535                         file.remove();
 536
 537                         INFO(SINK, "Syncing disk and rebooting.");
 538                         ::sync();
 539                         ::reboot(RB_AUTOBOOT);
 540                 } catch (runtime::Exception &e) {
 541                         ERROR(SINK, "Decryption failed: " + std::string(e.what()));
 542                 }
 543         };
 544
 545         std::thread asyncWork(decryptWorker);
 546         asyncWork.detach();
 547
 548         return error::None;
 549 }
 550
 551 int InternalEncryptionServer::recovery()
 552 {
 553         int state = getState();
 554
 555         if (state == State::Unencrypted)
 556                 return error::NoSuchDevice;
 557
 558         runtime::File file("/opt/.factoryreset");
 559         file.create(0640);
 560
 561         ::sync();
 562         try {
 563                 dbus::Connection& systemDBus = dbus::Connection::getSystem();
 564                 systemDBus.methodcall("org.tizen.system.deviced",
 565                                                                 "/Org/Tizen/System/DeviceD/Power",
 566                                                                 "org.tizen.system.deviced.power",
 567                                                                 "reboot",
 568                                                                 -1, "()", "(si)", "reboot", 0);
 569         } catch (runtime::Exception &e) {
 570                 ::reboot(RB_AUTOBOOT);
 571         }
 572         return error::None;
 573 }
 574
 575 int InternalEncryptionServer::isPasswordInitialized()
 576 {
 577         return keyServer.isInitialized(engine->getSource());
 578 }
 579
 580 int InternalEncryptionServer::initPassword(const std::string& password)
 581 {
 582         return keyServer.init(engine->getSource(), password, Key::DEFAULT_256BIT);
 583 }
 584
 585 int InternalEncryptionServer::cleanPassword(const std::string& password)
 586 {
 587         return keyServer.remove(engine->getSource(), password);
 588 }
 589
 590 int InternalEncryptionServer::changePassword(const std::string& oldPassword,
 591                                                                                 const std::string& newPassword)
 592 {
 593         return keyServer.changePassword(engine->getSource(), oldPassword, newPassword);
 594 }
 595
 596 int InternalEncryptionServer::verifyPassword(const std::string& password)
 597 {
 598         return keyServer.verifyPassword(engine->getSource(), password);
 599 }
 600
 601 int InternalEncryptionServer::getState()
 602 {
 603         char *value = ::vconf_get_str(VCONFKEY_ODE_CRYPTO_STATE);
 604         if (value == NULL) {
 605                 throw runtime::Exception("Failed to get vconf value.");
 606         }
 607
 608         std::string valueStr(value);
 609         free(value);
 610
 611         if (valueStr == "encrypted")
 612                 return State::Encrypted;
 613         else if (valueStr == "unencrypted")
 614                 return State::Unencrypted;
 615         else if (valueStr == "error_partially_encrypted" || valueStr == "error_partially_decrypted")
 616                 return State::Corrupted;
 617
 618         return State::Invalid;
 619 }
 620
 621 unsigned int InternalEncryptionServer::getSupportedOptions()
 622 {
 623         return engine->getSupportedOptions();
 624 }
 625
 626 std::string InternalEncryptionServer::getDevicePath() const
 627 {
 628         return engine->getSource();
 629 }
 630
 631 } // namespace ode