git.zerfleddert.de Git - proxmark3-svn/blob - client/mifarehost.c

   1 // Merlok, 2011, 2012
   2 // people from mifare@nethemba.com, 2010
   3 //
   4 // This code is licensed to you under the terms of the GNU GPL, version 2 or,
   5 // at your option, any later version. See the LICENSE.txt file for the text of
   6 // the license.
   7 //-----------------------------------------------------------------------------
   8 // mifare commands
   9 //-----------------------------------------------------------------------------
  10
  11 #include <stdio.h>
  12 #include <stdlib.h>
  13 #include <string.h>
  14 #include "mifarehost.h"
  15 #include "proxmark3.h"
  16
  17 // MIFARE
  18
  19 int compar_int(const void * a, const void * b) {
  20         return (*(uint64_t*)b - *(uint64_t*)a);
  21 }
  22
  23 // Compare countKeys structure
  24 int compar_special_int(const void * a, const void * b) {
  25         return (((countKeys *)b)->count - ((countKeys *)a)->count);
  26 }
  27
  28 countKeys * uniqsort(uint64_t * possibleKeys, uint32_t size) {
  29         int i, j = 0;
  30         int count = 0;
  31         countKeys *our_counts;
  32
  33         qsort(possibleKeys, size, sizeof (uint64_t), compar_int);
  34
  35         our_counts = calloc(size, sizeof(countKeys));
  36         if (our_counts == NULL) {
  37                 PrintAndLog("Memory allocation error for our_counts");
  38                 return NULL;
  39         }
  40
  41         for (i = 0; i < size; i++) {
  42         if (possibleKeys[i+1] == possibleKeys[i]) {
  43                         count++;
  44                 } else {
  45                         our_counts[j].key = possibleKeys[i];
  46                         our_counts[j].count = count;
  47                         j++;
  48                         count=0;
  49                 }
  50         }
  51         qsort(our_counts, j, sizeof(countKeys), compar_special_int);
  52         return (our_counts);
  53 }
  54
  55 int mfnested(uint8_t blockNo, uint8_t keyType, uint8_t * key, uint8_t trgBlockNo, uint8_t trgKeyType, uint8_t * resultKeys)
  56 {
  57         int i, m, len;
  58         uint8_t isEOF;
  59         uint32_t uid;
  60         fnVector * vector = NULL;
  61         countKeys       *ck;
  62         int lenVector = 0;
  63         UsbCommand resp;
  64
  65         memset(resultKeys, 0x00, 16 * 6);
  66
  67         // flush queue
  68         while (!WaitForResponseTimeout(CMD_ACK,NULL,500));
  69
  70   UsbCommand c = {CMD_MIFARE_NESTED, {blockNo, keyType, trgBlockNo + trgKeyType * 0x100}};
  71         memcpy(c.d.asBytes, key, 6);
  72   SendCommand(&c);
  73
  74         PrintAndLog("\n");
  75
  76         // wait cycle
  77         while (true) {
  78                 printf(".");
  79                 if (ukbhit()) {
  80                         getchar();
  81                         printf("\naborted via keyboard!\n");
  82                         break;
  83                 }
  84
  85                 if (WaitForResponseTimeout(CMD_ACK,&resp,1500)) {
  86                         isEOF  = resp.arg[0] & 0xff;
  87
  88                         if (isEOF) break;
  89
  90                         len = resp.arg[1] & 0xff;
  91                         if (len == 0) continue;
  92
  93                         memcpy(&uid, resp.d.asBytes, 4);
  94                         PrintAndLog("uid:%08x len=%d trgbl=%d trgkey=%x", uid, len, resp.arg[2] & 0xff, (resp.arg[2] >> 8) & 0xff);
  95                         vector = (fnVector *) realloc((void *)vector, (lenVector + len) * sizeof(fnVector) + 200);
  96                         if (vector == NULL) {
  97                                 PrintAndLog("Memory allocation error for fnVector. len: %d bytes: %d", lenVector + len, (lenVector + len) * sizeof(fnVector));
  98                                 break;
  99                         }
 100
 101                         for (i = 0; i < len; i++) {
 102                                 vector[lenVector + i].blockNo = resp.arg[2] & 0xff;
 103                                 vector[lenVector + i].keyType = (resp.arg[2] >> 8) & 0xff;
 104                                 vector[lenVector + i].uid = uid;
 105
 106                                 memcpy(&vector[lenVector + i].nt,  (void *)(resp.d.asBytes + 8 + i * 8 + 0), 4);
 107                                 memcpy(&vector[lenVector + i].ks1, (void *)(resp.d.asBytes + 8 + i * 8 + 4), 4);
 108                         }
 109
 110                         lenVector += len;
 111                 }
 112         }
 113
 114         if (!lenVector) {
 115                 PrintAndLog("Got 0 keys from proxmark.");
 116                 return 1;
 117         }
 118         printf("------------------------------------------------------------------\n");
 119
 120         // calc keys
 121         struct Crypto1State* revstate = NULL;
 122         struct Crypto1State* revstate_start = NULL;
 123         uint64_t lfsr;
 124         int kcount = 0;
 125         pKeys           *pk;
 126
 127         if ((pk = (void *) malloc(sizeof(pKeys))) == NULL) return 1;
 128         memset(pk, 0x00, sizeof(pKeys));
 129
 130         for (m = 0; m < lenVector; m++) {
 131                 // And finally recover the first 32 bits of the key
 132                 revstate = lfsr_recovery32(vector[m].ks1, vector[m].nt ^ vector[m].uid);
 133                 if (revstate_start == NULL) revstate_start = revstate;
 134
 135                 while ((revstate->odd != 0x0) || (revstate->even != 0x0)) {
 136                         lfsr_rollback_word(revstate, vector[m].nt ^ vector[m].uid, 0);
 137                         crypto1_get_lfsr(revstate, &lfsr);
 138
 139                         // Allocate a new space for keys
 140                         if (((kcount % MEM_CHUNK) == 0) || (kcount >= pk->size)) {
 141                                 pk->size += MEM_CHUNK;
 142 //fprintf(stdout, "New chunk by %d, sizeof %d\n", kcount, pk->size * sizeof(uint64_t));
 143                                 pk->possibleKeys = (uint64_t *) realloc((void *)pk->possibleKeys, pk->size * sizeof(uint64_t));
 144                                 if (pk->possibleKeys == NULL) {
 145                                         PrintAndLog("Memory allocation error for pk->possibleKeys");
 146                                         return 1;
 147                                 }
 148                         }
 149                         pk->possibleKeys[kcount] = lfsr;
 150                         kcount++;
 151                         revstate++;
 152                 }
 153         free(revstate_start);
 154         revstate_start = NULL;
 155
 156         }
 157
 158         // Truncate
 159         if (kcount != 0) {
 160                 pk->size = --kcount;
 161                 if ((pk->possibleKeys = (uint64_t *) realloc((void *)pk->possibleKeys, pk->size * sizeof(uint64_t))) == NULL) {
 162                         PrintAndLog("Memory allocation error for pk->possibleKeys");
 163                         return 1;
 164                 }
 165         }
 166
 167         PrintAndLog("Total keys count:%d", kcount);
 168         ck = uniqsort(pk->possibleKeys, pk->size);
 169
 170         // fill key array
 171         for (i = 0; i < 16 ; i++) {
 172                 num_to_bytes(ck[i].key, 6, (uint8_t*)(resultKeys + i * 6));
 173         }
 174
 175         // finalize
 176         free(pk->possibleKeys);
 177         free(pk);
 178         free(ck);
 179         free(vector);
 180
 181         return 0;
 182 }
 183
 184 int mfCheckKeys (uint8_t blockNo, uint8_t keyType, uint8_t keycnt, uint8_t * keyBlock, uint64_t * key){
 185         *key = 0;
 186
 187   UsbCommand c = {CMD_MIFARE_CHKKEYS, {blockNo, keyType, keycnt}};
 188         memcpy(c.d.asBytes, keyBlock, 6 * keycnt);
 189   SendCommand(&c);
 190
 191         UsbCommand resp;
 192         if (!WaitForResponseTimeout(CMD_ACK,&resp,3000)) return 1;
 193         if ((resp.arg[0] & 0xff) != 0x01) return 2;
 194         *key = bytes_to_num(resp.d.asBytes, 6);
 195         return 0;
 196 }
 197
 198 // EMULATOR
 199
 200 int mfEmlGetMem(uint8_t *data, int blockNum, int blocksCount) {
 201         UsbCommand c = {CMD_MIFARE_EML_MEMGET, {blockNum, blocksCount, 0}};
 202         SendCommand(&c);
 203
 204   UsbCommand resp;
 205         if (!WaitForResponseTimeout(CMD_ACK,&resp,1500)) return 1;
 206         memcpy(data, resp.d.asBytes, blocksCount * 16);
 207         return 0;
 208 }
 209
 210 int mfEmlSetMem(uint8_t *data, int blockNum, int blocksCount) {
 211         UsbCommand c = {CMD_MIFARE_EML_MEMSET, {blockNum, blocksCount, 0}};
 212         memcpy(c.d.asBytes, data, blocksCount * 16);
 213         SendCommand(&c);
 214         return 0;
 215 }
 216
 217 // "MAGIC" CARD
 218
 219 int mfCSetUID(uint8_t *uid, uint8_t *oldUID, int wantWipe) {
 220         uint8_t block0[16];
 221         memset(block0, 0, 16);
 222         memcpy(block0, uid, 4);
 223         block0[4] = block0[0]^block0[1]^block0[2]^block0[3]; // Mifare UID BCC
 224         // mifare classic SAK(byte 5) and ATQA(byte 6 and 7)
 225         block0[5] = 0x88;
 226         block0[6] = 0x04;
 227         block0[7] = 0x00;
 228
 229         return mfCSetBlock(0, block0, oldUID, wantWipe, CSETBLOCK_SINGLE_OPER);
 230 }
 231
 232 int mfCSetBlock(uint8_t blockNo, uint8_t *data, uint8_t *uid, int wantWipe, uint8_t params) {
 233         uint8_t isOK = 0;
 234
 235         UsbCommand c = {CMD_MIFARE_EML_CSETBLOCK, {wantWipe, params & (0xFE | (uid == NULL ? 0:1)), blockNo}};
 236         memcpy(c.d.asBytes, data, 16);
 237         SendCommand(&c);
 238
 239   UsbCommand resp;
 240         if (WaitForResponseTimeout(CMD_ACK,&resp,1500)) {
 241                 isOK  = resp.arg[0] & 0xff;
 242                 if (uid != NULL) memcpy(uid, resp.d.asBytes, 4);
 243                 if (!isOK) return 2;
 244         } else {
 245                 PrintAndLog("Command execute timeout");
 246                 return 1;
 247         }
 248         return 0;
 249 }
 250
 251 int mfCGetBlock(uint8_t blockNo, uint8_t *data, uint8_t params) {
 252         uint8_t isOK = 0;
 253
 254         UsbCommand c = {CMD_MIFARE_EML_CGETBLOCK, {params, 0, blockNo}};
 255         SendCommand(&c);
 256
 257   UsbCommand resp;
 258         if (WaitForResponseTimeout(CMD_ACK,&resp,1500)) {
 259                 isOK  = resp.arg[0] & 0xff;
 260                 memcpy(data, resp.d.asBytes, 16);
 261                 if (!isOK) return 2;
 262         } else {
 263                 PrintAndLog("Command execute timeout");
 264                 return 1;
 265         }
 266         return 0;
 267 }
 268
 269 // SNIFFER
 270
 271 // constants
 272 static uint8_t trailerAccessBytes[4] = {0x08, 0x77, 0x8F, 0x00};
 273
 274 // variables
 275 char logHexFileName[200] = {0x00};
 276 static uint8_t traceCard[4096] = {0x00};
 277 static char traceFileName[20];
 278 static int traceState = TRACE_IDLE;
 279 static uint8_t traceCurBlock = 0;
 280 static uint8_t traceCurKey = 0;
 281
 282 struct Crypto1State *traceCrypto1 = NULL;
 283
 284 struct Crypto1State *revstate;
 285 uint64_t lfsr;
 286 uint32_t ks2;
 287 uint32_t ks3;
 288
 289 uint32_t uid;     // serial number
 290 uint32_t nt;      // tag challenge
 291 uint32_t nt_par;
 292 uint32_t nr_enc;  // encrypted reader challenge
 293 uint32_t ar_enc;  // encrypted reader response
 294 uint32_t nr_ar_par;
 295 uint32_t at_enc;  // encrypted tag response
 296 uint32_t at_par;
 297
 298 int isTraceCardEmpty(void) {
 299         return ((traceCard[0] == 0) && (traceCard[1] == 0) && (traceCard[2] == 0) && (traceCard[3] == 0));
 300 }
 301
 302 int isBlockEmpty(int blockN) {
 303         for (int i = 0; i < 16; i++)
 304                 if (traceCard[blockN * 16 + i] != 0) return 0;
 305
 306         return 1;
 307 }
 308
 309 int isBlockTrailer(int blockN) {
 310  return ((blockN & 0x03) == 0x03);
 311 }
 312
 313 int loadTraceCard(uint8_t *tuid) {
 314         FILE * f;
 315         char buf[64];
 316         uint8_t buf8[64];
 317         int i, blockNum;
 318
 319         if (!isTraceCardEmpty()) saveTraceCard();
 320         memset(traceCard, 0x00, 4096);
 321         memcpy(traceCard, tuid + 3, 4);
 322         FillFileNameByUID(traceFileName, tuid, ".eml", 7);
 323
 324         f = fopen(traceFileName, "r");
 325         if (!f) return 1;
 326
 327         blockNum = 0;
 328         while(!feof(f)){
 329                 memset(buf, 0, sizeof(buf));
 330                 fgets(buf, sizeof(buf), f);
 331
 332                 if (strlen(buf) < 32){
 333                         if (feof(f)) break;
 334                         PrintAndLog("File content error. Block data must include 32 HEX symbols");
 335                         return 2;
 336                 }
 337                 for (i = 0; i < 32; i += 2)
 338                         sscanf(&buf[i], "%02x", (unsigned int *)&buf8[i / 2]);
 339
 340                 memcpy(traceCard + blockNum * 16, buf8, 16);
 341
 342                 blockNum++;
 343         }
 344         fclose(f);
 345
 346         return 0;
 347 }
 348
 349 int saveTraceCard(void) {
 350         FILE * f;
 351
 352         if ((!strlen(traceFileName)) || (isTraceCardEmpty())) return 0;
 353
 354         f = fopen(traceFileName, "w+");
 355         for (int i = 0; i < 64; i++) {  // blocks
 356                 for (int j = 0; j < 16; j++)  // bytes
 357                         fprintf(f, "%02x", *(traceCard + i * 16 + j));
 358                 fprintf(f,"\n");
 359         }
 360         fclose(f);
 361
 362         return 0;
 363 }
 364
 365 int mfTraceInit(uint8_t *tuid, uint8_t *atqa, uint8_t sak, bool wantSaveToEmlFile) {
 366
 367         if (traceCrypto1) crypto1_destroy(traceCrypto1);
 368         traceCrypto1 = NULL;
 369
 370         if (wantSaveToEmlFile) loadTraceCard(tuid);
 371         traceCard[4] = traceCard[0] ^ traceCard[1] ^ traceCard[2] ^ traceCard[3];
 372         traceCard[5] = sak;
 373         memcpy(&traceCard[6], atqa, 2);
 374         traceCurBlock = 0;
 375         uid = bytes_to_num(tuid + 3, 4);
 376
 377         traceState = TRACE_IDLE;
 378
 379         return 0;
 380 }
 381
 382 void mf_crypto1_decrypt(struct Crypto1State *pcs, uint8_t *data, int len, bool isEncrypted){
 383         uint8_t bt = 0;
 384         int i;
 385
 386         if (len != 1) {
 387                 for (i = 0; i < len; i++)
 388                         data[i] = crypto1_byte(pcs, 0x00, isEncrypted) ^ data[i];
 389         } else {
 390                 bt = 0;
 391                 for (i = 0; i < 4; i++)
 392                         bt |= (crypto1_bit(pcs, 0, isEncrypted) ^ BIT(data[0], i)) << i;
 393
 394                 data[0] = bt;
 395         }
 396         return;
 397 }
 398
 399
 400 int mfTraceDecode(uint8_t *data_src, int len, uint32_t parity, bool wantSaveToEmlFile) {
 401         uint8_t data[64];
 402
 403         if (traceState == TRACE_ERROR) return 1;
 404         if (len > 64) {
 405                 traceState = TRACE_ERROR;
 406                 return 1;
 407         }
 408
 409         memcpy(data, data_src, len);
 410         if ((traceCrypto1) && ((traceState == TRACE_IDLE) || (traceState > TRACE_AUTH_OK))) {
 411                 mf_crypto1_decrypt(traceCrypto1, data, len, 0);
 412                 PrintAndLog("dec> %s", sprint_hex(data, len));
 413                 AddLogHex(logHexFileName, "dec> ", data, len);
 414         }
 415
 416         switch (traceState) {
 417         case TRACE_IDLE:
 418                 // check packet crc16!
 419                 if ((len >= 4) && (!CheckCrc14443(CRC_14443_A, data, len))) {
 420                         PrintAndLog("dec> CRC ERROR!!!");
 421                         AddLogLine(logHexFileName, "dec> ", "CRC ERROR!!!");
 422                         traceState = TRACE_ERROR;  // do not decrypt the next commands
 423                         return 1;
 424                 }
 425
 426                 // AUTHENTICATION
 427                 if ((len ==4) && ((data[0] == 0x60) || (data[0] == 0x61))) {
 428                         traceState = TRACE_AUTH1;
 429                         traceCurBlock = data[1];
 430                         traceCurKey = data[0] == 60 ? 1:0;
 431                         return 0;
 432                 }
 433
 434                 // READ
 435                 if ((len ==4) && ((data[0] == 0x30))) {
 436                         traceState = TRACE_READ_DATA;
 437                         traceCurBlock = data[1];
 438                         return 0;
 439                 }
 440
 441                 // WRITE
 442                 if ((len ==4) && ((data[0] == 0xA0))) {
 443                         traceState = TRACE_WRITE_OK;
 444                         traceCurBlock = data[1];
 445                         return 0;
 446                 }
 447
 448                 // HALT
 449                 if ((len ==4) && ((data[0] == 0x50) && (data[1] == 0x00))) {
 450                         traceState = TRACE_ERROR;  // do not decrypt the next commands
 451                         return 0;
 452                 }
 453
 454                 return 0;
 455         break;
 456
 457         case TRACE_READ_DATA:
 458                 if (len == 18) {
 459                         traceState = TRACE_IDLE;
 460
 461                         if (isBlockTrailer(traceCurBlock)) {
 462                                 memcpy(traceCard + traceCurBlock * 16 + 6, data + 6, 4);
 463                         } else {
 464                                 memcpy(traceCard + traceCurBlock * 16, data, 16);
 465                         }
 466                         if (wantSaveToEmlFile) saveTraceCard();
 467                         return 0;
 468                 } else {
 469                         traceState = TRACE_ERROR;
 470                         return 1;
 471                 }
 472         break;
 473
 474         case TRACE_WRITE_OK:
 475                 if ((len == 1) && (data[0] = 0x0a)) {
 476                         traceState = TRACE_WRITE_DATA;
 477
 478                         return 0;
 479                 } else {
 480                         traceState = TRACE_ERROR;
 481                         return 1;
 482                 }
 483         break;
 484
 485         case TRACE_WRITE_DATA:
 486                 if (len == 18) {
 487                         traceState = TRACE_IDLE;
 488
 489                         memcpy(traceCard + traceCurBlock * 16, data, 16);
 490                         if (wantSaveToEmlFile) saveTraceCard();
 491                         return 0;
 492                 } else {
 493                         traceState = TRACE_ERROR;
 494                         return 1;
 495                 }
 496         break;
 497
 498         case TRACE_AUTH1:
 499                 if (len == 4) {
 500                         traceState = TRACE_AUTH2;
 501
 502                         nt = bytes_to_num(data, 4);
 503                         nt_par = parity;
 504                         return 0;
 505                 } else {
 506                         traceState = TRACE_ERROR;
 507                         return 1;
 508                 }
 509         break;
 510
 511         case TRACE_AUTH2:
 512                 if (len == 8) {
 513                         traceState = TRACE_AUTH_OK;
 514
 515                         nr_enc = bytes_to_num(data, 4);
 516                         ar_enc = bytes_to_num(data + 4, 4);
 517                         nr_ar_par = parity;
 518                         return 0;
 519                 } else {
 520                         traceState = TRACE_ERROR;
 521                         return 1;
 522                 }
 523         break;
 524
 525         case TRACE_AUTH_OK:
 526                 if (len ==4) {
 527                         traceState = TRACE_IDLE;
 528
 529                         at_enc = bytes_to_num(data, 4);
 530                         at_par = parity;
 531
 532                         //  decode key here)
 533                         if (!traceCrypto1) {
 534                                 ks2 = ar_enc ^ prng_successor(nt, 64);
 535                                 ks3 = at_enc ^ prng_successor(nt, 96);
 536                                 revstate = lfsr_recovery64(ks2, ks3);
 537                                 lfsr_rollback_word(revstate, 0, 0);
 538                                 lfsr_rollback_word(revstate, 0, 0);
 539                                 lfsr_rollback_word(revstate, nr_enc, 1);
 540                                 lfsr_rollback_word(revstate, uid ^ nt, 0);
 541                         }else{
 542                                 ks2 = ar_enc ^ prng_successor(nt, 64);
 543                                 ks3 = at_enc ^ prng_successor(nt, 96);
 544                                 revstate = lfsr_recovery64(ks2, ks3);
 545                                 lfsr_rollback_word(revstate, 0, 0);
 546                                 lfsr_rollback_word(revstate, 0, 0);
 547                                 lfsr_rollback_word(revstate, nr_enc, 1);
 548                                 lfsr_rollback_word(revstate, uid ^ nt, 0);
 549                         }
 550                         crypto1_get_lfsr(revstate, &lfsr);
 551                         printf("key> %x%x\n", (unsigned int)((lfsr & 0xFFFFFFFF00000000) >> 32), (unsigned int)(lfsr & 0xFFFFFFFF));
 552                         AddLogUint64(logHexFileName, "key> ", lfsr);
 553
 554                         int blockShift = ((traceCurBlock & 0xFC) + 3) * 16;
 555                         if (isBlockEmpty((traceCurBlock & 0xFC) + 3)) memcpy(traceCard + blockShift + 6, trailerAccessBytes, 4);
 556
 557                         if (traceCurKey) {
 558                                 num_to_bytes(lfsr, 6, traceCard + blockShift + 10);
 559                         } else {
 560                                 num_to_bytes(lfsr, 6, traceCard + blockShift);
 561                         }
 562                         if (wantSaveToEmlFile) saveTraceCard();
 563
 564                         if (traceCrypto1) {
 565                                 crypto1_destroy(traceCrypto1);
 566                         }
 567
 568                         // set cryptosystem state
 569                         traceCrypto1 = lfsr_recovery64(ks2, ks3);
 570
 571 //      nt = crypto1_word(traceCrypto1, nt ^ uid, 1) ^ nt;
 572
 573         /*      traceCrypto1 = crypto1_create(lfsr); // key in lfsr
 574                 crypto1_word(traceCrypto1, nt ^ uid, 0);
 575                 crypto1_word(traceCrypto1, ar, 1);
 576                 crypto1_word(traceCrypto1, 0, 0);
 577                 crypto1_word(traceCrypto1, 0, 0);*/
 578
 579                         return 0;
 580                 } else {
 581                         traceState = TRACE_ERROR;
 582                         return 1;
 583                 }
 584         break;
 585
 586         default:
 587                 traceState = TRACE_ERROR;
 588                 return 1;
 589         }
 590
 591         return 0;
 592 }