version2/src/C/CloudComm.cc

   1 #include "CloudComm.h"
   2 #include "TimingSingleton.h"
   3 #include "SecureRandom.h"
   4 #include "IoTString.h"
   5 #include "Error.h"
   6 #include "URL.h"
   7
   8 /**
   9  * Empty Constructor needed for child class.
  10  */
  11 CloudComm::CloudComm() :
  12         baseurl(NULL),
  13         key(NULL),
  14         mac(NULL),
  15         password(NULL),
  16         random(NULL),
  17         salt(NULL),
  18         table(NULL),
  19         listeningPort(-1),
  20         localServerThread(NULL),
  21         doEnd(false),
  22         timer(TimingSingleton_getInstance())
  23 {
  24 }
  25
  26 /**
  27  * Constructor for actual use. Takes in the url and password.
  28  */
  29 CloudComm::CloudComm(Table *_table,  IoTString *_baseurl, IoTString *_password, int _listeningPort) :
  30         baseurl(_baseurl),
  31         key(NULL),
  32         mac(NULL),
  33         password(_password),
  34         random(new SecureRandom()),
  35         salt(NULL),
  36         table(_table),
  37         listeningPort(_listeningPort),
  38         localServerThread(NULL),
  39         doEnd(false),
  40         timer(TimingSingleton_getInstance()) {
  41         if (listeningPort > 0) {
  42                 localServerThread = new Thread(new Runnable() {
  43                         void run() {
  44                                 localServerWorkerFunction();
  45                         }
  46                 });
  47                 localServerThread->start();
  48         }
  49 }
  50
  51 /**
  52  * Generates Key from password.
  53  */
  54 SecretKeySpec *CloudComm::initKey() {
  55         try {
  56                 PBEKeySpec keyspec = new PBEKeySpec(password->internalBytes(),
  57                                                                                                                                                                 salt,
  58                                                                                                                                                                 65536,
  59                                                                                                                                                                 128);
  60                 SecretKey tmpkey = SecretKeyFactory_getInstance("PBKDF2WithHmacSHA256")->generateSecret(keyspec);
  61                 return new SecretKeySpec(tmpkey->getEncoded(), "AES");
  62         } catch (Exception *e) {
  63                 throw new Error("Failed generating key.");
  64         }
  65 }
  66
  67 /**
  68  * Inits all the security stuff
  69  */
  70
  71 void CloudComm::initSecurity() {
  72         // try to get the salt and if one does not exist set one
  73         if (!getSalt()) {
  74                 //Set the salt
  75                 setSalt();
  76         }
  77
  78         initCrypt();
  79 }
  80
  81 /**
  82  * Inits the HMAC generator.
  83  */
  84 void CloudComm::initCrypt() {
  85
  86         if (password == NULL) {
  87                 return;
  88         }
  89
  90         try {
  91                 key = initKey();
  92                 password = NULL;// drop password
  93                 mac = Mac_getInstance("HmacSHA256");
  94                 mac->init(key);
  95         } catch (Exception *e) {
  96                 throw new Error("Failed To Initialize Ciphers");
  97         }
  98 }
  99
 100 /*
 101  * Builds the URL for the given request.
 102  */
 103 URL *CloudComm::buildRequest(bool isput, int64_t sequencenumber, int64_t maxentries) {
 104         IoTString *reqstring = isput ? "req=putslot" : "req=getslot";
 105         IoTString *urlstr = baseurl + "?" + reqstring + "&seq=" + sequencenumber;
 106         if (maxentries != 0)
 107                 urlstr += "&max=" + maxentries;
 108         return new URL(urlstr);
 109 }
 110
 111 void CloudComm::setSalt() {
 112
 113         if (salt != NULL) {
 114                 // Salt already sent to server so dont set it again
 115                 return;
 116         }
 117
 118         try {
 119                 Array<char> *saltTmp = new Array<char>(CloudComm_SALT_SIZE);
 120                 random->nextBytes(saltTmp);
 121
 122                 for (int i = 0; i < CloudComm_SALT_SIZE; i++) {
 123                         printf("%d\n", (int)saltTmp->get(i) & 255);
 124                 }
 125
 126
 127                 URL *url = new URL(baseurl + "?req=setsalt");
 128
 129                 timer->startTime();
 130                 URLConnection con = url->openConnection();
 131                 HttpURLConnection http = (HttpURLConnection) con;
 132
 133                 http->setRequestMethod("POST");
 134                 http->setFixedLengthStreamingMode(saltTmp->length());
 135                 http->setDoOutput(true);
 136                 http->setConnectTimeout(CloudComm_TIMEOUT_MILLIS);
 137
 138
 139                 http->connect();
 140
 141                 OutputStream *os = http->getOutputStream();
 142                 os->write(saltTmp);
 143                 os->flush();
 144
 145                 int responsecode = http->getResponseCode();
 146                 if (responsecode != HttpURLConnection.HTTP_OK) {
 147                         // TODO: Remove this print
 148                         System.out.println(responsecode);
 149                         throw new Error("Invalid response");
 150                 }
 151
 152                 timer->endTime();
 153
 154                 salt = saltTmp;
 155         } catch (Exception *e) {
 156                 timer->endTime();
 157                 throw new ServerException("Failed setting salt", ServerException.TypeConnectTimeout);
 158         }
 159 }
 160
 161 bool CloudComm::getSalt() {
 162         URL *url = NULL;
 163         URLConnection *con = NULL;
 164         HttpURLConnection *http = NULL;
 165
 166         try {
 167                 url = new URL(baseurl + "?req=getsalt");
 168         } catch (Exception *e) {
 169                 throw new Error("getSlot failed");
 170         }
 171         try {
 172
 173                 timer->startTime();
 174                 con = url->openConnection();
 175                 http = (HttpURLConnection) con;
 176                 http->setRequestMethod("POST");
 177                 http->setConnectTimeout(CloudComm_TIMEOUT_MILLIS);
 178                 http->setReadTimeout(CloudComm_TIMEOUT_MILLIS);
 179
 180
 181                 http->connect();
 182                 timer->endTime();
 183         } catch (SocketTimeoutException *e) {
 184                 timer->endTime();
 185                 throw new ServerException("getSalt failed", ServerException.TypeConnectTimeout);
 186         } catch (Exception *e) {
 187                 throw new Error("getSlot failed");
 188         }
 189
 190         try {
 191
 192                 timer->startTime();
 193
 194                 int responsecode = http.getResponseCode();
 195                 if (responsecode != HttpURLConnection.HTTP_OK) {
 196                         // TODO: Remove this print
 197                         // System.out.println(responsecode);
 198                         throw new Error("Invalid response");
 199                 }
 200
 201                 InputStream is = http->getInputStream();
 202                 if (is->available() > 0) {
 203                         DataInputStream *dis = new DataInputStream(is);
 204                         int salt_length = dis->readInt();
 205                         Array<char> *tmp = new Array<char>(salt_length);
 206                         dis->readFully(tmp);
 207                         salt = tmp;
 208                         timer->endTime();
 209
 210                         return true;
 211                 } else {
 212                         timer->endTime();
 213
 214                         return false;
 215                 }
 216         } catch (SocketTimeoutException *e) {
 217                 timer->endTime();
 218
 219                 throw new ServerException("getSalt failed", ServerException.TypeInputTimeout);
 220         } catch (Exception *e) {
 221                 throw new Error("getSlot failed");
 222         }
 223 }
 224
 225 Array<char> *CloudComm::createIV(int64_t machineId, int64_t localSequenceNumber) {
 226         ByteBuffer buffer = ByteBuffer.allocate(CloudComm_IV_SIZE);
 227         buffer->putLong(machineId);
 228         int64_t localSequenceNumberShifted = localSequenceNumber << 16;
 229         buffer->putLong(localSequenceNumberShifted);
 230         return buffer->array();
 231 }
 232
 233 Array<char> *CloudComm::encryptSlotAndPrependIV(Array<char> *rawData, Array<char> *ivBytes) {
 234         try {
 235                 IvParameterSpec ivSpec = new IvParameterSpec(ivBytes);
 236                 Cipher cipher = Cipher.getInstance("AES/CTR/NoPadding");
 237                 cipher->init(Cipher.ENCRYPT_MODE, key, ivSpec);
 238
 239                 Array<char> *encryptedBytes = cipher->doFinal(rawData);
 240
 241                 Array<char> *chars = new Array<char>(encryptedBytes->length() + CloudComm_IV_SIZE);
 242                 System_arraycopy(ivBytes, 0, chars, 0, ivBytes.length());
 243                 System_arraycopy(encryptedBytes, 0, chars, CloudComm_IV_SIZE, encryptedBytes.length);
 244
 245                 return chars;
 246
 247         } catch (Exception *e) {
 248                 throw new Error("Failed To Encrypt");
 249         }
 250 }
 251
 252
 253 Array<char> *CloudComm::stripIVAndDecryptSlot(Array<char> *rawData) {
 254         try {
 255                 Array<char> *ivBytes = new Array<char>(CloudComm_IV_SIZE);
 256                 Array<char> *encryptedBytes = new Array<char>(rawData->length() - CloudComm_IV_SIZE);
 257                 System_arraycopy(rawData, 0, ivBytes, 0, CloudComm_IV_SIZE);
 258                 System_arraycopy(rawData, CloudComm_IV_SIZE, encryptedBytes, 0, encryptedBytes->length);
 259
 260                 IvParameterSpec *ivSpec = new IvParameterSpec(ivBytes);
 261
 262                 Cipher *cipher = Cipher_getInstance("AES/CTR/NoPadding");
 263                 cipher->init(Cipher_DECRYPT_MODE, key, ivSpec);
 264                 return cipher->doFinal(encryptedBytes);
 265
 266         } catch (Exception *e) {
 267                 throw new Error("Failed To Decrypt");
 268         }
 269 }
 270
 271
 272 /*
 273  * API for putting a slot into the queue.  Returns NULL on success.
 274  * On failure, the server will send slots with newer sequence
 275  * numbers.
 276  */
 277 Array<Slot *> *CloudComm::putSlot(Slot *slot, int max) {
 278         try {
 279                 if (salt == NULL) {
 280                         if (!getSalt()) {
 281                                 throw new ServerException("putSlot failed", ServerException.TypeSalt);
 282                         }
 283                         initCrypt();
 284                 }
 285
 286                 int64_t sequencenumber = slot->getSequenceNumber();
 287                 Array<char> *slotBytes = slot->encode(mac);
 288
 289                 Array<char> *chars = encryptSlotAndPrependIV(slotBytes, slot->getSlotCryptIV());
 290
 291                 URL *url = buildRequest(true, sequencenumber, max);
 292
 293                 timer->startTime();
 294                 URLConnection *con = url->openConnection();
 295                 HttpURLConnection *http = (HttpURLConnection *) con;
 296
 297                 http->setRequestMethod("POST");
 298                 http->setFixedLengthStreamingMode(chars->length);
 299                 http->setDoOutput(true);
 300                 http->setConnectTimeout(CloudComm_TIMEOUT_MILLIS);
 301                 http->setReadTimeout(CloudComm_TIMEOUT_MILLIS);
 302                 http->connect();
 303
 304                 OutputStream *os = http->getOutputStream();
 305                 os->write(chars);
 306                 os->flush();
 307
 308                 timer->endTime();
 309
 310
 311         } catch (ServerException *e) {
 312                 timer->endTime();
 313
 314                 throw e;
 315         } catch (SocketTimeoutException *e) {
 316                 timer->endTime();
 317
 318                 throw new ServerException("putSlot failed", ServerException.TypeConnectTimeout);
 319         } catch (Exception *e) {
 320                 throw new Error("putSlot failed");
 321         }
 322
 323
 324
 325         try {
 326                 timer->startTime();
 327                 InputStream is = http->getInputStream();
 328                 DataInputStream *dis = new DataInputStream(is);
 329                 Array<char> *resptype = new Array<char>(7);
 330                 dis->readFully(resptype);
 331                 timer->endTime();
 332
 333                 if (Arrays->equals(resptype, "getslot"->getBytes())) {
 334                         return processSlots(dis);
 335                 } else if (Arrays->equals(resptype, "putslot"->getBytes())) {
 336                         return NULL;
 337                 } else
 338                         throw new Error("Bad response to putslot");
 339
 340         } catch (SocketTimeoutException *e) {
 341                 timer->endTime();
 342                 throw new ServerException("putSlot failed", ServerException->TypeInputTimeout);
 343         } catch (Exception *e) {
 344                 throw new Error("putSlot failed");
 345         }
 346 }
 347
 348 /**
 349  * Request the server to send all slots with the given
 350  * sequencenumber or newer->
 351  */
 352 Array<Slot *> *CloudComm::getSlots(int64_t sequencenumber) {
 353         try {
 354                 if (salt == NULL) {
 355                         if (!getSalt()) {
 356                                 throw new ServerException("getSlots failed", ServerException.TypeSalt);
 357                         }
 358                         initCrypt();
 359                 }
 360
 361                 URL *url = buildRequest(false, sequencenumber, 0);
 362                 timer->startTime();
 363                 URLConnection *con = url->openConnection();
 364                 HttpURLConnection *http = (HttpURLConnection) con;
 365                 http->setRequestMethod("POST");
 366                 http->setConnectTimeout(CloudComm_TIMEOUT_MILLIS);
 367                 http->setReadTimeout(CloudComm_TIMEOUT_MILLIS);
 368
 369
 370
 371                 http->connect();
 372                 timer->endTime();
 373
 374         } catch (SocketTimeoutException *e) {
 375                 timer->endTime();
 376
 377                 throw new ServerException("getSlots failed", ServerException.TypeConnectTimeout);
 378         } catch (ServerException *e) {
 379                 timer->endTime();
 380
 381                 throw e;
 382         } catch (Exception *e) {
 383                 throw new Error("getSlots failed");
 384         }
 385
 386         try {
 387
 388                 timer->startTime();
 389                 InputStream *is = http->getInputStream();
 390                 DataInputStream *dis = new DataInputStream(is);
 391                 Array<char> *resptype = new Array<char>(7);
 392
 393                 dis->readFully(resptype);
 394                 timer->endTime();
 395
 396                 if (!resptype->equals("getslot".getBytes()))
 397                         throw new Error("Bad Response: " + new String(resptype));
 398
 399                 return processSlots(dis);
 400         } catch (SocketTimeoutException *e) {
 401                 timer->endTime();
 402
 403                 throw new ServerException("getSlots failed", ServerException.TypeInputTimeout);
 404         } catch (Exception *e) {
 405                 throw new Error("getSlots failed");
 406         }
 407 }
 408
 409 /**
 410  * Method that actually handles building Slot objects from the
 411  * server response.  Shared by both putSlot and getSlots.
 412  */
 413 Array<Slot *> *CloudComm::processSlots(DataInputStream *dis) {
 414         int numberofslots = dis->readInt();
 415         Array<int> *sizesofslots = new Array<int>(numberofslots);
 416
 417         Array<Slot *> *slots = new Array<Slot *>(numberofslots);
 418         for (int i = 0; i < numberofslots; i++)
 419                 sizesofslots->set(i, dis->readInt());
 420
 421         for (int i = 0; i < numberofslots; i++) {
 422                 Array<char> *rawData = new Array<char>(sizesofslots->get(i));
 423                 dis->readFully(rawData);
 424
 425                 Array<char> *data = stripIVAndDecryptSlot(rawData);
 426                 slots->set(i, Slot_decode(table, data, mac));
 427         }
 428         dis->close();
 429         return slots;
 430 }
 431
 432 Array<char> *sendLocalData(Array<char> *sendData, int64_t localSequenceNumber, String host, int port) {
 433         if (salt == NULL) {
 434                 return NULL;
 435         }
 436         try {
 437                 printf("Passing Locally\n");
 438
 439                 mac->update(sendData);
 440                 Array<char> *genmac = mac->doFinal();
 441                 Array<char> *totalData = new Array<char>(sendData->length() + genmac->length());
 442                 System_arraycopy(sendData, 0, totalData, 0, sendData.length());
 443                 System - arraycopy(genmac, 0, totalData, sendData.length, genmac->length());
 444
 445                 // Encrypt the data for sending
 446                 Array<char> *iv = createIV(table->getMachineId(), table->getLocalSequenceNumber());
 447                 Array<char> *encryptedData = encryptSlotAndPrependIV(totalData, iv);
 448
 449                 // Open a TCP socket connection to a local device
 450                 Socket *socket = new Socket(host, port);
 451                 socket->setReuseAddress(true);
 452                 DataOutputStream *output = new DataOutputStream(socket->getOutputStream());
 453                 DataInputStream *input = new DataInputStream(socket->getInputStream());
 454
 455                 timer->startTime();
 456                 // Send data to output (length of data, the data)
 457                 output->writeInt(encryptedData->length);
 458                 output->write(encryptedData, 0, encryptedData->length);
 459                 output->flush();
 460
 461                 int lengthOfReturnData = input->readInt();
 462                 Array<char> *returnData = new Array<char>(lengthOfReturnData);
 463                 input->readFully(returnData);
 464
 465                 timer->endTime();
 466
 467                 returnData = stripIVAndDecryptSlot(returnData);
 468
 469                 // We are done with this socket
 470                 socket->close();
 471
 472                 mac->update(returnData, 0, returnData->length - HMAC_SIZE);
 473                 Array<char> *realmac = mac->doFinal();
 474                 Array<char> *recmac = new Array<char>(HMAC_SIZE);
 475                 System_arraycopy(returnData, returnData->length - realmac->length, recmac, 0, realmac->length);
 476
 477                 if (!Arrays->equals(recmac, realmac))
 478                         throw new Error("Local Error: Invalid HMAC!  Potential Attack!");
 479
 480                 Array<char> *returnData2 = new Array<char>(lengthOfReturnData - recmac->length());
 481                 System_arraycopy(returnData, 0, returnData2, 0, returnData2->length);
 482
 483                 return returnData2;
 484         } catch (Exception *e) {
 485                 printf("Exception\n");
 486         }
 487
 488         return NULL;
 489 }
 490
 491 void CloudComm::localServerWorkerFunction() {
 492         ServerSocket *inputSocket = NULL;
 493
 494         try {
 495                 // Local server socket
 496                 inputSocket = new ServerSocket(listeningPort);
 497                 inputSocket->setReuseAddress(true);
 498                 inputSocket->setSoTimeout(CloudComm_TIMEOUT_MILLIS);
 499         } catch (Exception *e) {
 500                 throw new Error("Local server setup failure...");
 501         }
 502
 503         while (!doEnd) {
 504                 try {
 505                         // Accept incoming socket
 506                         Socket *socket = inputSocket->accept();
 507
 508                         DataInputStream *input = new DataInputStream(socket->getInputStream());
 509                         DataOutputStream *output = new DataOutputStream(socket->getOutputStream());
 510
 511                         // Get the encrypted data from the server
 512                         int dataSize = input->readInt();
 513                         Array<char> *readData = new Array<char>(dataSize);
 514                         input->readFully(readData);
 515
 516                         timer->endTime();
 517
 518                         // Decrypt the data
 519                         readData = stripIVAndDecryptSlot(readData);
 520
 521                         mac->update(readData, 0, readData->length - HMAC_SIZE);
 522                         Array<char> *genmac = mac->doFinal();
 523                         Array<char> *recmac = new Array<char>(HMAC_SIZE);
 524                         System_arraycopy(readData, readData->length() - recmac->length(), recmac, 0, recmac->length());
 525
 526                         if (!recmac->equals(genmac))
 527                                 throw new Error("Local Error: Invalid HMAC!  Potential Attack!");
 528
 529                         Array<char> *returnData = new Array<char>(readData->length() - recmac->length());
 530                         System_arraycopy(readData, 0, returnData, 0, returnData->length());
 531
 532                         // Process the data
 533                         Array<char> *sendData = table->acceptDataFromLocal(returnData);
 534
 535
 536                         mac->update(sendData);
 537                         Array<char> *realmac = mac->doFinal();
 538                         Array<char> *totalData = new Array<char>(sendData->length() + realmac->length());
 539                         System_arraycopy(sendData, 0, totalData, 0, sendData->length());
 540                         System_arraycopy(realmac, 0, totalData, sendData->length(), realmac->length());
 541
 542                         // Encrypt the data for sending
 543                         Array<char> *iv = createIV(table->getMachineId(), table->getLocalSequenceNumber());
 544                         Array<char> *encryptedData = encryptSlotAndPrependIV(totalData, iv);
 545
 546
 547                         timer->startTime();
 548                         // Send data to output (length of data, the data)
 549                         output->writeInt(encryptedData->length());
 550                         output->write(encryptedData, 0, encryptedData->length());
 551                         output->flush();
 552
 553                         // close the socket
 554                         socket->close();
 555                 } catch (Exception *e) {
 556                 }
 557         }
 558
 559         if (inputSocket != NULL) {
 560                 try {
 561                         inputSocket->close();
 562                 } catch (Exception *e) {
 563                         throw new Error("Local server close failure...");
 564                 }
 565         }
 566 }
 567
 568 void CloudComm::close() {
 569         doEnd = true;
 570
 571         if (localServerThread != NULL) {
 572                 try {
 573                         localServerThread->join();
 574                 } catch (Exception *e) {
 575                         throw new Error("Local Server thread join issue...");
 576                 }
 577         }
 578 }
 579