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 void stopDependedSystemdUnits()
 188 {
 189         dbus::Connection& systemDBus = dbus::Connection::getSystem();
 190         std::set<std::string> unitsToStop;
 191         pid_t p = -1;
 192
 193         for (pid_t pid : runtime::FileUser::getList(INTERNAL_PATH, true)) {
 194                 try {
 195                         char *unit;
 196                         systemDBus.methodcall("org.freedesktop.systemd1",
 197                                                                         "/org/freedesktop/systemd1",
 198                                                                         "org.freedesktop.systemd1.Manager",
 199                                                                         "GetUnitByPID",
 200                                                                         -1, "(o)", "(u)", (unsigned int)pid)
 201                                                                                 .get("(o)", &unit);
 202
 203                         if (std::string(unit) ==
 204                                         "/org/freedesktop/systemd1/unit/samsung_2dlog_2dmgr_2eservice")
 205                                 p = pid;
 206                         else
 207                                 unitsToStop.insert(unit);
 208                 } catch (runtime::Exception &e) {
 209                         INFO(SINK, "Killing process: " + std::to_string(pid));
 210                         ::kill(pid, SIGKILL);
 211                 }
 212         }
 213
 214         JobWatch watch(systemDBus);
 215
 216         for (const std::string& unit : unitsToStop) {
 217                 INFO(SINK, "Stopping unit: " + unit);
 218                 const char* job = NULL;
 219                 systemDBus.methodcall("org.freedesktop.systemd1",
 220                                                                 unit,
 221                                                                 "org.freedesktop.systemd1.Unit",
 222                                                                 "Stop",
 223                                                                 -1, "(o)", "(s)", "flush").get("(o)", &job);
 224                 INFO(SINK, "Waiting for job: " + std::string(job));
 225                 if (!watch.waitForJob(job))
 226                         throw runtime::Exception("Stopping unit: " + unit + " failed");
 227         }
 228
 229         if (::umount2("/sys/fs/cgroup", MNT_FORCE | MNT_DETACH) != 0)
 230                 INFO(SINK, "Failed to unmount cgroup");
 231
 232         if (p != -1)
 233                 ::kill(p, SIGKILL);
 234 }
 235
 236 void showProgressUI(const std::string type)
 237 {
 238         dbus::Connection& systemDBus = dbus::Connection::getSystem();
 239         std::string unit("ode-progress-ui@"+type+".service");
 240
 241         JobWatch watch(systemDBus);
 242         INFO(SINK, "Start unit: " + unit);
 243
 244         const char* job = NULL;
 245         systemDBus.methodcall("org.freedesktop.systemd1",
 246                                                         "/org/freedesktop/systemd1",
 247                                                         "org.freedesktop.systemd1.Manager",
 248                                                         "StartUnit",
 249                                                         -1, "(o)", "(ss)", unit.c_str(), "replace").get("(o)", &job);
 250
 251         INFO(SINK, "Waiting for job: " + std::string(job));
 252         if (!watch.waitForJob(job))
 253                 throw runtime::Exception("Starting unit: " + unit + " failed");
 254 }
 255
 256 unsigned int getOptions()
 257 {
 258         unsigned int result = 0;
 259         int value;
 260
 261         value = 0;
 262         ::vconf_get_bool(VCONFKEY_ODE_FAST_ENCRYPTION, &value);
 263         if (value) {
 264                 result |= InternalEncryption::Option::IncludeUnusedRegion;
 265         }
 266
 267         return result;
 268 }
 269
 270 void setOptions(unsigned int options)
 271 {
 272         bool value;
 273
 274         if (options & InternalEncryption::Option::IncludeUnusedRegion) {
 275                 value = true;
 276         } else {
 277                 value = false;
 278         }
 279         ::vconf_set_bool(VCONFKEY_ODE_FAST_ENCRYPTION, value);
 280 }
 281
 282 void unmountInternalStorage(const std::string& source)
 283 {
 284         while(true) {
 285                 auto mntPaths = findMountPointsByDevice(source);
 286                 if(mntPaths.empty())
 287                         break;
 288
 289                 bool unmounted = true;
 290                 for(const auto& path : mntPaths) {
 291                         INFO(SINK, "Unmounting " + path);
 292                         if (::umount(path.c_str()) == -1) {
 293                                 // If it's busy or was already unmounted ignore the error
 294                                 if (errno != EBUSY && errno != EINVAL) {
 295                                         throw runtime::Exception("umount() error: " + runtime::GetSystemErrorMessage());
 296                                 }
 297                                 unmounted = false;
 298                         }
 299                 }
 300                 if (!unmounted)
 301                         stopDependedSystemdUnits();
 302         }
 303 }
 304
 305 }
 306
 307 InternalEncryptionServer::InternalEncryptionServer(ServerContext& srv,
 308                                                                                                    KeyServer& key) :
 309         server(srv),
 310         keyServer(key)
 311 {
 312         server.expose(this, PRIVILEGE_PLATFORM, (int)(InternalEncryptionServer::setMountPassword)(std::string));
 313         server.expose(this, PRIVILEGE_PLATFORM, (int)(InternalEncryptionServer::mount)());
 314         server.expose(this, PRIVILEGE_PLATFORM, (int)(InternalEncryptionServer::umount)());
 315         server.expose(this, PRIVILEGE_PLATFORM, (int)(InternalEncryptionServer::encrypt)(std::string, unsigned int));
 316         server.expose(this, PRIVILEGE_PLATFORM, (int)(InternalEncryptionServer::decrypt)(std::string));
 317         server.expose(this, "", (int)(InternalEncryptionServer::isPasswordInitialized)());
 318         server.expose(this, PRIVILEGE_PLATFORM, (int)(InternalEncryptionServer::recovery)());
 319         server.expose(this, PRIVILEGE_PLATFORM, (int)(InternalEncryptionServer::initPassword)(std::string));
 320         server.expose(this, PRIVILEGE_PLATFORM, (int)(InternalEncryptionServer::cleanPassword)(std::string));
 321         server.expose(this, PRIVILEGE_PLATFORM, (int)(InternalEncryptionServer::changePassword)(std::string, std::string));
 322         server.expose(this, PRIVILEGE_PLATFORM, (int)(InternalEncryptionServer::verifyPassword)(std::string));
 323         server.expose(this, "", (int)(InternalEncryptionServer::getState)());
 324         server.expose(this, "", (unsigned int)(InternalEncryptionServer::getSupportedOptions)());
 325         server.expose(this, "", (std::string)(InternalEncryptionServer::getDevicePath)());
 326
 327         server.createNotification("InternalEncryptionServer::mount");
 328
 329         std::string source = findDevPath();
 330
 331         engine.reset(new INTERNAL_ENGINE(
 332                 source, INTERNAL_PATH,
 333                 ProgressBar([](int v) {
 334                         ::vconf_set_str(VCONFKEY_ODE_ENCRYPT_PROGRESS,
 335                                                         std::to_string(v).c_str());
 336                 })
 337         ));
 338 }
 339
 340 InternalEncryptionServer::~InternalEncryptionServer()
 341 {
 342 }
 343
 344 int InternalEncryptionServer::setMountPassword(const std::string& password)
 345 {
 346         return keyServer.get(engine->getSource(), password, mountKey);
 347 }
 348
 349 int InternalEncryptionServer::mount()
 350 {
 351         if (mountKey.empty()) {
 352                 ERROR(SINK, "You need to call set_mount_password() first.");
 353                 return error::NoData;
 354         }
 355
 356         BinaryData key = mountKey;
 357         mountKey.clear();
 358
 359         if (getState() != State::Encrypted) {
 360                 INFO(SINK, "Cannot mount, SD partition's state incorrect.");
 361                 return error::NoSuchDevice;
 362         }
 363
 364         if (engine->isMounted()) {
 365                 INFO(SINK, "Partition already mounted.");
 366                 return error::None;
 367         }
 368
 369         INFO(SINK, "Mounting internal storage.");
 370         try {
 371                 engine->mount(key, getOptions());
 372
 373                 server.notify("InternalEncryptionServer::mount");
 374
 375                 runtime::File("/tmp/.lazy_mount").create(O_WRONLY);
 376                 runtime::File("/tmp/.unlock_mnt").create(O_WRONLY);
 377         } catch (runtime::Exception &e) {
 378                 ERROR(SINK, "Mount failed: " + std::string(e.what()));
 379                 return error::Unknown;
 380         }
 381
 382         return error::None;
 383 }
 384
 385 int InternalEncryptionServer::umount()
 386 {
 387         if (getState() != State::Encrypted) {
 388                 ERROR(SINK, "Cannot umount, partition's state incorrect.");
 389                 return error::NoSuchDevice;
 390         }
 391
 392         if (!engine->isMounted()) {
 393                 INFO(SINK, "Partition already umounted.");
 394                 return error::None;
 395         }
 396
 397         INFO(SINK, "Closing all processes using internal storage.");
 398         try {
 399                 stopDependedSystemdUnits();
 400                 INFO(SINK, "Umounting internal storage.");
 401                 engine->umount();
 402         } catch (runtime::Exception &e) {
 403                 ERROR(SINK, "Umount failed: " + std::string(e.what()));
 404                 return error::Unknown;
 405         }
 406
 407         return error::None;
 408 }
 409
 410 int InternalEncryptionServer::encrypt(const std::string& password, unsigned int options)
 411 {
 412         if (getState() != State::Unencrypted) {
 413                 ERROR(SINK, "Cannot encrypt, partition's state incorrect.");
 414                 return error::NoSuchDevice;
 415         }
 416
 417         BinaryData masterKey;
 418         int ret = keyServer.get(engine->getSource(), password, masterKey);
 419         if (ret != error::None)
 420                 return ret;
 421
 422         auto encryptWorker = [masterKey, options, this]() {
 423                 try {
 424                         showProgressUI("encrypt");
 425                         ::sleep(1);
 426
 427                         INFO(SINK, "Closing all known systemd services that might be using internal storage.");
 428                         stopKnownSystemdUnits();
 429
 430                         std::string source = engine->getSource();
 431                         auto mntPaths = findMountPointsByDevice(source);
 432
 433                         if (!mntPaths.empty()) {
 434                                 INFO(SINK, "Closing all processes using internal storage.");
 435                                 stopDependedSystemdUnits();
 436
 437                                 INFO(SINK, "Unmounting internal storage.");
 438                                 unmountInternalStorage(source);
 439                         }
 440
 441                         INFO(SINK, "Encryption started.");
 442                         ::vconf_set_str(VCONFKEY_ODE_CRYPTO_STATE, "error_partially_encrypted");
 443                         engine->encrypt(masterKey, options);
 444                         setOptions(options & getSupportedOptions());
 445
 446                         INFO(SINK, "Encryption completed.");
 447                         ::vconf_set_str(VCONFKEY_ODE_CRYPTO_STATE, "encrypted");
 448                         server.notify("InternalEncryptionServer::mount");
 449
 450                         INFO(SINK, "Syncing disk and rebooting.");
 451                         ::sync();
 452                         ::reboot(RB_AUTOBOOT);
 453                 } catch (runtime::Exception &e) {
 454                         ERROR(SINK, "Encryption failed: " + std::string(e.what()));
 455                 }
 456         };
 457
 458         std::thread asyncWork(encryptWorker);
 459         asyncWork.detach();
 460
 461         return error::None;
 462 }
 463
 464 int InternalEncryptionServer::decrypt(const std::string& password)
 465 {
 466         if (getState() != State::Encrypted) {
 467                 ERROR(SINK, "Cannot decrypt, partition's state incorrect.");
 468                 return error::NoSuchDevice;
 469         }
 470
 471         BinaryData masterKey;
 472         int ret = keyServer.get(engine->getSource(), password, masterKey);
 473         if (ret != error::None)
 474                 return ret;
 475
 476         auto decryptWorker = [masterKey, this]() {
 477                 try {
 478                         showProgressUI("decrypt");
 479                         ::sleep(1);
 480
 481                         if (engine->isMounted()) {
 482                                 INFO(SINK, "Closing all known systemd services that might be using internal storage.");
 483                                 stopKnownSystemdUnits();
 484                                 INFO(SINK, "Closing all processes using internal storage.");
 485                                 stopDependedSystemdUnits();
 486
 487                                 INFO(SINK, "Umounting internal storage.");
 488                                 while (1) {
 489                                         try {
 490                                                 engine->umount();
 491                                                 break;
 492                                         } catch (runtime::Exception& e) {
 493                                                 stopDependedSystemdUnits();
 494                                         }
 495                                 }
 496                         }
 497
 498                         INFO(SINK, "Decryption started.");
 499                         ::vconf_set_str(VCONFKEY_ODE_CRYPTO_STATE, "error_partially_decrypted");
 500                         engine->decrypt(masterKey, getOptions());
 501
 502                         INFO(SINK, "Decryption complete.");
 503                         ::vconf_set_str(VCONFKEY_ODE_CRYPTO_STATE, "unencrypted");
 504
 505                         INFO(SINK, "Syncing disk and rebooting.");
 506                         ::sync();
 507                         ::reboot(RB_AUTOBOOT);
 508                 } catch (runtime::Exception &e) {
 509                         ERROR(SINK, "Decryption failed: " + std::string(e.what()));
 510                 }
 511         };
 512
 513         std::thread asyncWork(decryptWorker);
 514         asyncWork.detach();
 515
 516         return error::None;
 517 }
 518
 519 int InternalEncryptionServer::recovery()
 520 {
 521         int state = getState();
 522
 523         if (state == State::Unencrypted)
 524                 return error::NoSuchDevice;
 525
 526         if (state == State::Corrupted)
 527                 Ext4Tool::mkfs(engine->getSource());
 528
 529         std::fstream fs;
 530         fs.open("/opt/.factoryreset", std::ios::out);
 531         fs.close();
 532
 533         ::sync();
 534         try {
 535                 dbus::Connection& systemDBus = dbus::Connection::getSystem();
 536                 systemDBus.methodcall("org.tizen.system.deviced",
 537                                                                 "/Org/Tizen/System/DeviceD/Power",
 538                                                                 "org.tizen.system.deviced.power",
 539                                                                 "reboot",
 540                                                                 -1, "()", "(si)", "reboot", 0);
 541         } catch (runtime::Exception &e) {
 542                 ::reboot(RB_AUTOBOOT);
 543         }
 544         return error::None;
 545 }
 546
 547 int InternalEncryptionServer::isPasswordInitialized()
 548 {
 549         return keyServer.isInitialized(engine->getSource());
 550 }
 551
 552 int InternalEncryptionServer::initPassword(const std::string& password)
 553 {
 554         return keyServer.init(engine->getSource(), password, Key::DEFAULT_256BIT);
 555 }
 556
 557 int InternalEncryptionServer::cleanPassword(const std::string& password)
 558 {
 559         return keyServer.remove(engine->getSource(), password);
 560 }
 561
 562 int InternalEncryptionServer::changePassword(const std::string& oldPassword,
 563                                                                                 const std::string& newPassword)
 564 {
 565         return keyServer.changePassword(engine->getSource(), oldPassword, newPassword);
 566 }
 567
 568 int InternalEncryptionServer::verifyPassword(const std::string& password)
 569 {
 570         return keyServer.verifyPassword(engine->getSource(), password);
 571 }
 572
 573 int InternalEncryptionServer::getState()
 574 {
 575         char *value = ::vconf_get_str(VCONFKEY_ODE_CRYPTO_STATE);
 576         if (value == NULL) {
 577                 throw runtime::Exception("Failed to get vconf value.");
 578         }
 579
 580         std::string valueStr(value);
 581         free(value);
 582
 583         if (valueStr == "encrypted")
 584                 return State::Encrypted;
 585         else if (valueStr == "unencrypted")
 586                 return State::Unencrypted;
 587         else if (valueStr == "error_partially_encrypted" || valueStr == "error_partially_decrypted")
 588                 return State::Corrupted;
 589
 590         return State::Invalid;
 591 }
 592
 593 unsigned int InternalEncryptionServer::getSupportedOptions()
 594 {
 595         return engine->getSupportedOptions();
 596 }
 597
 598 std::string InternalEncryptionServer::getDevicePath() const
 599 {
 600         return engine->getSource();
 601 }
 602
 603 } // namespace ode