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