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 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;
  63
  64         memset(resultKeys, 0x00, 16 * 6);
  65
  66         // flush queue
  67         WaitForResponseTimeout(CMD_ACK,NULL,100);
  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                 if (WaitForResponseTimeout(CMD_ACK,&resp,1500)) {
  85                         isEOF  = resp.arg[0] & 0xff;
  86
  87                         if (isEOF) break;
  88
  89                         len = resp.arg[1] & 0xff;
  90                         if (len == 0) continue;
  91
  92                         memcpy(&uid, resp.d.asBytes, 4);
  93                         PrintAndLog("uid:%08x len=%d trgbl=%d trgkey=%x", uid, len, resp.arg[2] & 0xff, (resp.arg[2] >> 8) & 0xff);
  94                         vector = (fnVector *) realloc((void *)vector, (lenVector + len) * sizeof(fnVector) + 200);
  95                         if (vector == NULL) {
  96                                 PrintAndLog("Memory allocation error for fnVector. len: %d bytes: %d", lenVector + len, (lenVector + len) * sizeof(fnVector));
  97                                 break;
  98                         }
  99
 100                         for (i = 0; i < len; i++) {
 101                                 vector[lenVector + i].blockNo = resp.arg[2] & 0xff;
 102                                 vector[lenVector + i].keyType = (resp.arg[2] >> 8) & 0xff;
 103                                 vector[lenVector + i].uid = uid;
 104
 105                                 memcpy(&vector[lenVector + i].nt,  (void *)(resp.d.asBytes + 8 + i * 8 + 0), 4);
 106                                 memcpy(&vector[lenVector + i].ks1, (void *)(resp.d.asBytes + 8 + i * 8 + 4), 4);
 107                         }
 108
 109                         lenVector += len;
 110                 }
 111         }
 112
 113         if (!lenVector) {
 114                 PrintAndLog("Got 0 keys from proxmark.");
 115                 return 1;
 116         }
 117         printf("------------------------------------------------------------------\n");
 118
 119         // calc keys
 120         struct Crypto1State* revstate = NULL;
 121         struct Crypto1State* revstate_start = NULL;
 122         uint64_t lfsr;
 123         int kcount = 0;
 124         pKeys           *pk;
 125
 126         if ((pk = (void *) malloc(sizeof(pKeys))) == NULL) return 1;
 127         memset(pk, 0x00, sizeof(pKeys));
 128
 129         for (m = 0; m < lenVector; m++) {
 130                 // And finally recover the first 32 bits of the key
 131                 revstate = lfsr_recovery32(vector[m].ks1, vector[m].nt ^ vector[m].uid);
 132                 if (revstate_start == NULL) revstate_start = revstate;
 133
 134                 while ((revstate->odd != 0x0) || (revstate->even != 0x0)) {
 135                         lfsr_rollback_word(revstate, vector[m].nt ^ vector[m].uid, 0);
 136                         crypto1_get_lfsr(revstate, &lfsr);
 137
 138                         // Allocate a new space for keys
 139                         if (((kcount % MEM_CHUNK) == 0) || (kcount >= pk->size)) {
 140                                 pk->size += MEM_CHUNK;
 141 //fprintf(stdout, "New chunk by %d, sizeof %d\n", kcount, pk->size * sizeof(uint64_t));
 142                                 pk->possibleKeys = (uint64_t *) realloc((void *)pk->possibleKeys, pk->size * sizeof(uint64_t));
 143                                 if (pk->possibleKeys == NULL) {
 144                                         PrintAndLog("Memory allocation error for pk->possibleKeys");
 145                                         return 1;
 146                                 }
 147                         }
 148                         pk->possibleKeys[kcount] = lfsr;
 149                         kcount++;
 150                         revstate++;
 151                 }
 152         free(revstate_start);
 153         revstate_start = NULL;
 154
 155         }
 156
 157         // Truncate
 158         if (kcount != 0) {
 159                 pk->size = --kcount;
 160                 if ((pk->possibleKeys = (uint64_t *) realloc((void *)pk->possibleKeys, pk->size * sizeof(uint64_t))) == NULL) {
 161                         PrintAndLog("Memory allocation error for pk->possibleKeys");
 162                         return 1;
 163                 }
 164         }
 165
 166         PrintAndLog("Total keys count:%d", kcount);
 167         ck = uniqsort(pk->possibleKeys, pk->size);
 168
 169         // fill key array
 170         for (i = 0; i < 16 ; i++) {
 171                 num_to_bytes(ck[i].key, 6, (uint8_t*)(resultKeys + i * 6));
 172         }
 173
 174         // finalize
 175         free(pk->possibleKeys);
 176         free(pk);
 177         free(ck);
 178         free(vector);
 179
 180         return 0;
 181 }
 182
 183 int mfCheckKeys (uint8_t blockNo, uint8_t keyType, uint8_t keycnt, uint8_t * keyBlock, uint64_t * key){
 184         *key = 0;
 185
 186   UsbCommand c = {CMD_MIFARE_CHKKEYS, {blockNo, keyType, keycnt}};
 187         memcpy(c.d.asBytes, keyBlock, 6 * keycnt);
 188   SendCommand(&c);
 189
 190         UsbCommand resp;
 191         if (!WaitForResponseTimeout(CMD_ACK,&resp,3000)) return 1;
 192         if ((resp.arg[0] & 0xff) != 0x01) return 2;
 193         *key = bytes_to_num(resp.d.asBytes, 6);
 194         return 0;
 195 }
 196
 197 // EMULATOR
 198
 199 int mfEmlGetMem(uint8_t *data, int blockNum, int blocksCount) {
 200         UsbCommand c = {CMD_MIFARE_EML_MEMGET, {blockNum, blocksCount, 0}};
 201         SendCommand(&c);
 202
 203   UsbCommand resp;
 204         if (!WaitForResponseTimeout(CMD_ACK,&resp,1500)) return 1;
 205         memcpy(data, resp.d.asBytes, blocksCount * 16);
 206         return 0;
 207 }
 208
 209 int mfEmlSetMem(uint8_t *data, int blockNum, int blocksCount) {
 210         UsbCommand c = {CMD_MIFARE_EML_MEMSET, {blockNum, blocksCount, 0}};
 211         memcpy(c.d.asBytes, data, blocksCount * 16);
 212         SendCommand(&c);
 213         return 0;
 214 }
 215
 216 // "MAGIC" CARD
 217
 218 int mfCSetUID(uint8_t *uid, uint8_t *oldUID, int wantWipe) {
 219         uint8_t block0[16];
 220         memset(block0, 0, 16);
 221         memcpy(block0, uid, 4);
 222         block0[4] = block0[0]^block0[1]^block0[2]^block0[3]; // Mifare UID BCC
 223         // mifare classic SAK(byte 5) and ATQA(byte 6 and 7)
 224         block0[5] = 0x88;
 225         block0[6] = 0x04;
 226         block0[7] = 0x00;
 227
 228         return mfCSetBlock(0, block0, oldUID, wantWipe, CSETBLOCK_SINGLE_OPER);
 229 }
 230
 231 int mfCSetBlock(uint8_t blockNo, uint8_t *data, uint8_t *uid, int wantWipe, uint8_t params) {
 232         uint8_t isOK = 0;
 233
 234         UsbCommand c = {CMD_MIFARE_EML_CSETBLOCK, {wantWipe, params & (0xFE | (uid == NULL ? 0:1)), blockNo}};
 235         memcpy(c.d.asBytes, data, 16);
 236         SendCommand(&c);
 237
 238   UsbCommand resp;
 239         if (WaitForResponseTimeout(CMD_ACK,&resp,1500)) {
 240                 isOK  = resp.arg[0] & 0xff;
 241                 if (uid != NULL) memcpy(uid, resp.d.asBytes, 4);
 242                 if (!isOK) return 2;
 243         } else {
 244                 PrintAndLog("Command execute timeout");
 245                 return 1;
 246         }
 247         return 0;
 248 }
 249
 250 int mfCGetBlock(uint8_t blockNo, uint8_t *data, uint8_t params) {
 251         uint8_t isOK = 0;
 252
 253         UsbCommand c = {CMD_MIFARE_EML_CGETBLOCK, {params, 0, blockNo}};
 254         SendCommand(&c);
 255
 256   UsbCommand resp;
 257         if (WaitForResponseTimeout(CMD_ACK,&resp,1500)) {
 258                 isOK  = resp.arg[0] & 0xff;
 259                 memcpy(data, resp.d.asBytes, 16);
 260                 if (!isOK) return 2;
 261         } else {
 262                 PrintAndLog("Command execute timeout");
 263                 return 1;
 264         }
 265         return 0;
 266 }
 267
 268 // SNIFFER
 269
 270 // constants
 271 static uint8_t trailerAccessBytes[4] = {0x08, 0x77, 0x8F, 0x00};
 272
 273 // variables
 274 char logHexFileName[200] = {0x00};
 275 static uint8_t traceCard[4096] = {0x00};
 276 static char traceFileName[20];
 277 static int traceState = TRACE_IDLE;
 278 static uint8_t traceCurBlock = 0;
 279 static uint8_t traceCurKey = 0;
 280
 281 struct Crypto1State *traceCrypto1 = NULL;
 282
 283 struct Crypto1State *revstate;
 284 uint64_t lfsr;
 285 uint32_t ks2;
 286 uint32_t ks3;
 287
 288 uint32_t uid;     // serial number
 289 uint32_t nt;      // tag challenge
 290 uint32_t nt_par;
 291 uint32_t nr_enc;  // encrypted reader challenge
 292 uint32_t ar_enc;  // encrypted reader response
 293 uint32_t nr_ar_par;
 294 uint32_t at_enc;  // encrypted tag response
 295 uint32_t at_par;
 296
 297 int isTraceCardEmpty(void) {
 298         return ((traceCard[0] == 0) && (traceCard[1] == 0) && (traceCard[2] == 0) && (traceCard[3] == 0));
 299 }
 300
 301 int isBlockEmpty(int blockN) {
 302         for (int i = 0; i < 16; i++)
 303                 if (traceCard[blockN * 16 + i] != 0) return 0;
 304
 305         return 1;
 306 }
 307
 308 int isBlockTrailer(int blockN) {
 309  return ((blockN & 0x03) == 0x03);
 310 }
 311
 312 int loadTraceCard(uint8_t *tuid) {
 313         FILE * f;
 314         char buf[64];
 315         uint8_t buf8[64];
 316         int i, blockNum;
 317
 318         if (!isTraceCardEmpty()) saveTraceCard();
 319         memset(traceCard, 0x00, 4096);
 320         memcpy(traceCard, tuid + 3, 4);
 321         FillFileNameByUID(traceFileName, tuid, ".eml", 7);
 322
 323         f = fopen(traceFileName, "r");
 324         if (!f) return 1;
 325
 326         blockNum = 0;
 327         while(!feof(f)){
 328                 memset(buf, 0, sizeof(buf));
 329                 if (fgets(buf, sizeof(buf), f) == NULL) {
 330       PrintAndLog("File reading error.");
 331                         return 2;
 332     }
 333
 334                 if (strlen(buf) < 32){
 335                         if (feof(f)) break;
 336                         PrintAndLog("File content error. Block data must include 32 HEX symbols");
 337                         return 2;
 338                 }
 339                 for (i = 0; i < 32; i += 2)
 340                         sscanf(&buf[i], "%02x", (unsigned int *)&buf8[i / 2]);
 341
 342                 memcpy(traceCard + blockNum * 16, buf8, 16);
 343
 344                 blockNum++;
 345         }
 346         fclose(f);
 347
 348         return 0;
 349 }
 350
 351 int saveTraceCard(void) {
 352         FILE * f;
 353
 354         if ((!strlen(traceFileName)) || (isTraceCardEmpty())) return 0;
 355
 356         f = fopen(traceFileName, "w+");
 357         for (int i = 0; i < 64; i++) {  // blocks
 358                 for (int j = 0; j < 16; j++)  // bytes
 359                         fprintf(f, "%02x", *(traceCard + i * 16 + j));
 360                 fprintf(f,"\n");
 361         }
 362         fclose(f);
 363
 364         return 0;
 365 }
 366
 367 int mfTraceInit(uint8_t *tuid, uint8_t *atqa, uint8_t sak, bool wantSaveToEmlFile) {
 368
 369         if (traceCrypto1) crypto1_destroy(traceCrypto1);
 370         traceCrypto1 = NULL;
 371
 372         if (wantSaveToEmlFile) loadTraceCard(tuid);
 373         traceCard[4] = traceCard[0] ^ traceCard[1] ^ traceCard[2] ^ traceCard[3];
 374         traceCard[5] = sak;
 375         memcpy(&traceCard[6], atqa, 2);
 376         traceCurBlock = 0;
 377         uid = bytes_to_num(tuid + 3, 4);
 378
 379         traceState = TRACE_IDLE;
 380
 381         return 0;
 382 }
 383
 384 void mf_crypto1_decrypt(struct Crypto1State *pcs, uint8_t *data, int len, bool isEncrypted){
 385         uint8_t bt = 0;
 386         int i;
 387
 388         if (len != 1) {
 389                 for (i = 0; i < len; i++)
 390                         data[i] = crypto1_byte(pcs, 0x00, isEncrypted) ^ data[i];
 391         } else {
 392                 bt = 0;
 393                 for (i = 0; i < 4; i++)
 394                         bt |= (crypto1_bit(pcs, 0, isEncrypted) ^ BIT(data[0], i)) << i;
 395
 396                 data[0] = bt;
 397         }
 398         return;
 399 }
 400
 401
 402 int mfTraceDecode(uint8_t *data_src, int len, uint32_t parity, bool wantSaveToEmlFile) {
 403         uint8_t data[64];
 404
 405         if (traceState == TRACE_ERROR) return 1;
 406         if (len > 64) {
 407                 traceState = TRACE_ERROR;
 408                 return 1;
 409         }
 410
 411         memcpy(data, data_src, len);
 412         if ((traceCrypto1) && ((traceState == TRACE_IDLE) || (traceState > TRACE_AUTH_OK))) {
 413                 mf_crypto1_decrypt(traceCrypto1, data, len, 0);
 414                 PrintAndLog("dec> %s", sprint_hex(data, len));
 415                 AddLogHex(logHexFileName, "dec> ", data, len);
 416         }
 417
 418         switch (traceState) {
 419         case TRACE_IDLE:
 420                 // check packet crc16!
 421                 if ((len >= 4) && (!CheckCrc14443(CRC_14443_A, data, len))) {
 422                         PrintAndLog("dec> CRC ERROR!!!");
 423                         AddLogLine(logHexFileName, "dec> ", "CRC ERROR!!!");
 424                         traceState = TRACE_ERROR;  // do not decrypt the next commands
 425                         return 1;
 426                 }
 427
 428                 // AUTHENTICATION
 429                 if ((len ==4) && ((data[0] == 0x60) || (data[0] == 0x61))) {
 430                         traceState = TRACE_AUTH1;
 431                         traceCurBlock = data[1];
 432                         traceCurKey = data[0] == 60 ? 1:0;
 433                         return 0;
 434                 }
 435
 436                 // READ
 437                 if ((len ==4) && ((data[0] == 0x30))) {
 438                         traceState = TRACE_READ_DATA;
 439                         traceCurBlock = data[1];
 440                         return 0;
 441                 }
 442
 443                 // WRITE
 444                 if ((len ==4) && ((data[0] == 0xA0))) {
 445                         traceState = TRACE_WRITE_OK;
 446                         traceCurBlock = data[1];
 447                         return 0;
 448                 }
 449
 450                 // HALT
 451                 if ((len ==4) && ((data[0] == 0x50) && (data[1] == 0x00))) {
 452                         traceState = TRACE_ERROR;  // do not decrypt the next commands
 453                         return 0;
 454                 }
 455
 456                 return 0;
 457         break;
 458
 459         case TRACE_READ_DATA:
 460                 if (len == 18) {
 461                         traceState = TRACE_IDLE;
 462
 463                         if (isBlockTrailer(traceCurBlock)) {
 464                                 memcpy(traceCard + traceCurBlock * 16 + 6, data + 6, 4);
 465                         } else {
 466                                 memcpy(traceCard + traceCurBlock * 16, data, 16);
 467                         }
 468                         if (wantSaveToEmlFile) saveTraceCard();
 469                         return 0;
 470                 } else {
 471                         traceState = TRACE_ERROR;
 472                         return 1;
 473                 }
 474         break;
 475
 476         case TRACE_WRITE_OK:
 477                 if ((len == 1) && (data[0] = 0x0a)) {
 478                         traceState = TRACE_WRITE_DATA;
 479
 480                         return 0;
 481                 } else {
 482                         traceState = TRACE_ERROR;
 483                         return 1;
 484                 }
 485         break;
 486
 487         case TRACE_WRITE_DATA:
 488                 if (len == 18) {
 489                         traceState = TRACE_IDLE;
 490
 491                         memcpy(traceCard + traceCurBlock * 16, data, 16);
 492                         if (wantSaveToEmlFile) saveTraceCard();
 493                         return 0;
 494                 } else {
 495                         traceState = TRACE_ERROR;
 496                         return 1;
 497                 }
 498         break;
 499
 500         case TRACE_AUTH1:
 501                 if (len == 4) {
 502                         traceState = TRACE_AUTH2;
 503
 504                         nt = bytes_to_num(data, 4);
 505                         nt_par = parity;
 506                         return 0;
 507                 } else {
 508                         traceState = TRACE_ERROR;
 509                         return 1;
 510                 }
 511         break;
 512
 513         case TRACE_AUTH2:
 514                 if (len == 8) {
 515                         traceState = TRACE_AUTH_OK;
 516
 517                         nr_enc = bytes_to_num(data, 4);
 518                         ar_enc = bytes_to_num(data + 4, 4);
 519                         nr_ar_par = parity;
 520                         return 0;
 521                 } else {
 522                         traceState = TRACE_ERROR;
 523                         return 1;
 524                 }
 525         break;
 526
 527         case TRACE_AUTH_OK:
 528                 if (len ==4) {
 529                         traceState = TRACE_IDLE;
 530
 531                         at_enc = bytes_to_num(data, 4);
 532                         at_par = parity;
 533
 534                         //  decode key here)
 535                         if (!traceCrypto1) {
 536                                 ks2 = ar_enc ^ prng_successor(nt, 64);
 537                                 ks3 = at_enc ^ prng_successor(nt, 96);
 538                                 revstate = lfsr_recovery64(ks2, ks3);
 539                                 lfsr_rollback_word(revstate, 0, 0);
 540                                 lfsr_rollback_word(revstate, 0, 0);
 541                                 lfsr_rollback_word(revstate, nr_enc, 1);
 542                                 lfsr_rollback_word(revstate, uid ^ nt, 0);
 543                         }else{
 544                                 ks2 = ar_enc ^ prng_successor(nt, 64);
 545                                 ks3 = at_enc ^ prng_successor(nt, 96);
 546                                 revstate = lfsr_recovery64(ks2, ks3);
 547                                 lfsr_rollback_word(revstate, 0, 0);
 548                                 lfsr_rollback_word(revstate, 0, 0);
 549                                 lfsr_rollback_word(revstate, nr_enc, 1);
 550                                 lfsr_rollback_word(revstate, uid ^ nt, 0);
 551                         }
 552                         crypto1_get_lfsr(revstate, &lfsr);
 553                         printf("key> %x%x\n", (unsigned int)((lfsr & 0xFFFFFFFF00000000) >> 32), (unsigned int)(lfsr & 0xFFFFFFFF));
 554                         AddLogUint64(logHexFileName, "key> ", lfsr);
 555
 556                         int blockShift = ((traceCurBlock & 0xFC) + 3) * 16;
 557                         if (isBlockEmpty((traceCurBlock & 0xFC) + 3)) memcpy(traceCard + blockShift + 6, trailerAccessBytes, 4);
 558
 559                         if (traceCurKey) {
 560                                 num_to_bytes(lfsr, 6, traceCard + blockShift + 10);
 561                         } else {
 562                                 num_to_bytes(lfsr, 6, traceCard + blockShift);
 563                         }
 564                         if (wantSaveToEmlFile) saveTraceCard();
 565
 566                         if (traceCrypto1) {
 567                                 crypto1_destroy(traceCrypto1);
 568                         }
 569
 570                         // set cryptosystem state
 571                         traceCrypto1 = lfsr_recovery64(ks2, ks3);
 572
 573 //      nt = crypto1_word(traceCrypto1, nt ^ uid, 1) ^ nt;
 574
 575         /*      traceCrypto1 = crypto1_create(lfsr); // key in lfsr
 576                 crypto1_word(traceCrypto1, nt ^ uid, 0);
 577                 crypto1_word(traceCrypto1, ar, 1);
 578                 crypto1_word(traceCrypto1, 0, 0);
 579                 crypto1_word(traceCrypto1, 0, 0);*/
 580
 581                         return 0;
 582                 } else {
 583                         traceState = TRACE_ERROR;
 584                         return 1;
 585                 }
 586         break;
 587
 588         default:
 589                 traceState = TRACE_ERROR;
 590                 return 1;
 591         }
 592
 593         return 0;
 594 }