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 <pthread.h>
  15 #include "mifarehost.h"
  16 #include "proxmark3.h"
  17
  18 // MIFARE
  19 int compar_int(const void * a, const void * b) {
  20         // didn't work: (the result is truncated to 32 bits)
  21         //return (*(uint64_t*)b - *(uint64_t*)a);
  22
  23         // better:
  24         if (*(uint64_t*)b == *(uint64_t*)a) return 0;
  25         else if (*(uint64_t*)b > *(uint64_t*)a) return 1;
  26         else return -1;
  27 }
  28
  29
  30
  31 // Compare 16 Bits out of cryptostate
  32 int Compare16Bits(const void * a, const void * b) {
  33         if ((*(uint64_t*)b & 0x00ff000000ff0000) == (*(uint64_t*)a & 0x00ff000000ff0000)) return 0;
  34         else if ((*(uint64_t*)b & 0x00ff000000ff0000) > (*(uint64_t*)a & 0x00ff000000ff0000)) return 1;
  35         else return -1;
  36 }
  37
  38
  39 typedef
  40         struct {
  41                 union {
  42                         struct Crypto1State *slhead;
  43                         uint64_t *keyhead;
  44                 } head;
  45                 union {
  46                         struct Crypto1State *sltail;
  47                         uint64_t *keytail;
  48                 } tail;
  49                 uint32_t len;
  50                 uint32_t uid;
  51                 uint32_t blockNo;
  52                 uint32_t keyType;
  53                 uint32_t nt;
  54                 uint32_t ks1;
  55         } StateList_t;
  56
  57
  58 // wrapper function for multi-threaded lfsr_recovery32
  59 void* nested_worker_thread(void *arg)
  60 {
  61         struct Crypto1State *p1;
  62         StateList_t *statelist = arg;
  63
  64         statelist->head.slhead = lfsr_recovery32(statelist->ks1, statelist->nt ^ statelist->uid);
  65         for (p1 = statelist->head.slhead; *(uint64_t *)p1 != 0; p1++);
  66         statelist->len = p1 - statelist->head.slhead;
  67         statelist->tail.sltail = --p1;
  68         qsort(statelist->head.slhead, statelist->len, sizeof(uint64_t), Compare16Bits);
  69
  70         return statelist->head.slhead;
  71 }
  72
  73
  74
  75
  76 int mfnested(uint8_t blockNo, uint8_t keyType, uint8_t * key, uint8_t trgBlockNo, uint8_t trgKeyType, uint8_t * resultKey, bool calibrate)
  77 {
  78         uint16_t i, len;
  79         uint32_t uid;
  80         UsbCommand resp;
  81
  82
  83         StateList_t statelists[2];
  84         struct Crypto1State *p1, *p2, *p3, *p4;
  85
  86         // flush queue
  87         WaitForResponseTimeout(CMD_ACK,NULL,100);
  88
  89         UsbCommand c = {CMD_MIFARE_NESTED, {blockNo + keyType * 0x100, trgBlockNo + trgKeyType * 0x100, calibrate}};
  90         memcpy(c.d.asBytes, key, 6);
  91         SendCommand(&c);
  92
  93         if (WaitForResponseTimeout(CMD_ACK,&resp,1500)) {
  94                 len = resp.arg[1];
  95                 if (len == 2) {
  96                         memcpy(&uid, resp.d.asBytes, 4);
  97                         PrintAndLog("uid:%08x len=%d trgbl=%d trgkey=%x", uid, len, (uint16_t)resp.arg[2] & 0xff, (uint16_t)resp.arg[2] >> 8);
  98
  99                         for (i = 0; i < 2; i++) {
 100                                 statelists[i].blockNo = resp.arg[2] & 0xff;
 101                                 statelists[i].keyType = (resp.arg[2] >> 8) & 0xff;
 102                                 statelists[i].uid = uid;
 103
 104                                 memcpy(&statelists[i].nt,  (void *)(resp.d.asBytes + 4 + i * 8 + 0), 4);
 105                                 memcpy(&statelists[i].ks1, (void *)(resp.d.asBytes + 4 + i * 8 + 4), 4);
 106                         }
 107                 }
 108                 else {
 109                         PrintAndLog("Got 0 keys from proxmark.");
 110                         return 1;
 111                 }
 112         }
 113
 114         // calc keys
 115
 116         pthread_t thread_id[2];
 117
 118         // create and run worker threads
 119         for (i = 0; i < 2; i++) {
 120                 pthread_create(thread_id + i, NULL, nested_worker_thread, &statelists[i]);
 121         }
 122
 123         // wait for threads to terminate:
 124         for (i = 0; i < 2; i++) {
 125                 pthread_join(thread_id[i], (void*)&statelists[i].head.slhead);
 126         }
 127
 128
 129         // the first 16 Bits of the cryptostate already contain part of our key.
 130         // Create the intersection of the two lists based on these 16 Bits and
 131         // roll back the cryptostate
 132         p1 = p3 = statelists[0].head.slhead;
 133         p2 = p4 = statelists[1].head.slhead;
 134         while (p1 <= statelists[0].tail.sltail && p2 <= statelists[1].tail.sltail) {
 135                 if (Compare16Bits(p1, p2) == 0) {
 136                         struct Crypto1State savestate, *savep = &savestate;
 137                         savestate = *p1;
 138                         while(Compare16Bits(p1, savep) == 0 && p1 <= statelists[0].tail.sltail) {
 139                                 *p3 = *p1;
 140                                 lfsr_rollback_word(p3, statelists[0].nt ^ statelists[0].uid, 0);
 141                                 p3++;
 142                                 p1++;
 143                         }
 144                         savestate = *p2;
 145                         while(Compare16Bits(p2, savep) == 0 && p2 <= statelists[1].tail.sltail) {
 146                                 *p4 = *p2;
 147                                 lfsr_rollback_word(p4, statelists[1].nt ^ statelists[1].uid, 0);
 148                                 p4++;
 149                                 p2++;
 150                         }
 151                 }
 152                 else {
 153                         while (Compare16Bits(p1, p2) == -1) p1++;
 154                         while (Compare16Bits(p1, p2) == 1) p2++;
 155                 }
 156         }
 157         p3->even = 0; p3->odd = 0;
 158         p4->even = 0; p4->odd = 0;
 159         statelists[0].len = p3 - statelists[0].head.slhead;
 160         statelists[1].len = p4 - statelists[1].head.slhead;
 161         statelists[0].tail.sltail=--p3;
 162         statelists[1].tail.sltail=--p4;
 163
 164         // the statelists now contain possible keys. The key we are searching for must be in the
 165         // intersection of both lists. Create the intersection:
 166         qsort(statelists[0].head.keyhead, statelists[0].len, sizeof(uint64_t), compar_int);
 167         qsort(statelists[1].head.keyhead, statelists[1].len, sizeof(uint64_t), compar_int);
 168
 169         uint64_t *p5, *p6, *p7;
 170         p5 = p7 = statelists[0].head.keyhead;
 171         p6 = statelists[1].head.keyhead;
 172         while (p5 <= statelists[0].tail.keytail && p6 <= statelists[1].tail.keytail) {
 173                 if (compar_int(p5, p6) == 0) {
 174                         *p7++ = *p5++;
 175                         p6++;
 176                 }
 177                 else {
 178                         while (compar_int(p5, p6) == -1) p5++;
 179                         while (compar_int(p5, p6) == 1) p6++;
 180                 }
 181         }
 182         statelists[0].len = p7 - statelists[0].head.keyhead;
 183         statelists[0].tail.keytail=--p7;
 184
 185         memset(resultKey, 0, 6);
 186         // The list may still contain several key candidates. Test each of them with mfCheckKeys
 187         for (i = 0; i < statelists[0].len; i++) {
 188                 uint8_t keyBlock[6];
 189                 uint64_t key64;
 190                 crypto1_get_lfsr(statelists[0].head.slhead + i, &key64);
 191                 num_to_bytes(key64, 6, keyBlock);
 192                 key64 = 0;
 193                 if (!mfCheckKeys(statelists[0].blockNo, statelists[0].keyType, 1, keyBlock, &key64)) {
 194                         num_to_bytes(key64, 6, resultKey);
 195                         break;
 196                 }
 197         }
 198
 199         free(statelists[0].head.slhead);
 200         free(statelists[1].head.slhead);
 201
 202         return 0;
 203 }
 204
 205 int mfCheckKeys (uint8_t blockNo, uint8_t keyType, uint8_t keycnt, uint8_t * keyBlock, uint64_t * key){
 206
 207         *key = 0;
 208
 209         UsbCommand c = {CMD_MIFARE_CHKKEYS, {blockNo, keyType, keycnt}};
 210         memcpy(c.d.asBytes, keyBlock, 6 * keycnt);
 211         SendCommand(&c);
 212
 213         UsbCommand resp;
 214         if (!WaitForResponseTimeout(CMD_ACK,&resp,3000)) return 1;
 215         if ((resp.arg[0] & 0xff) != 0x01) return 2;
 216         *key = bytes_to_num(resp.d.asBytes, 6);
 217         return 0;
 218 }
 219
 220 // EMULATOR
 221
 222 int mfEmlGetMem(uint8_t *data, int blockNum, int blocksCount) {
 223         UsbCommand c = {CMD_MIFARE_EML_MEMGET, {blockNum, blocksCount, 0}};
 224         SendCommand(&c);
 225
 226   UsbCommand resp;
 227         if (!WaitForResponseTimeout(CMD_ACK,&resp,1500)) return 1;
 228         memcpy(data, resp.d.asBytes, blocksCount * 16);
 229         return 0;
 230 }
 231
 232 int mfEmlSetMem(uint8_t *data, int blockNum, int blocksCount) {
 233         UsbCommand c = {CMD_MIFARE_EML_MEMSET, {blockNum, blocksCount, 0}};
 234         memcpy(c.d.asBytes, data, blocksCount * 16);
 235         SendCommand(&c);
 236         return 0;
 237 }
 238
 239 // "MAGIC" CARD
 240
 241 int mfCSetUID(uint8_t *uid, uint8_t *oldUID, int wantWipe) {
 242         uint8_t block0[16];
 243         memset(block0, 0, 16);
 244         memcpy(block0, uid, 4);
 245         block0[4] = block0[0]^block0[1]^block0[2]^block0[3]; // Mifare UID BCC
 246         // mifare classic SAK(byte 5) and ATQA(byte 6 and 7)
 247         block0[5] = 0x88;
 248         block0[6] = 0x04;
 249         block0[7] = 0x00;
 250
 251         return mfCSetBlock(0, block0, oldUID, wantWipe, CSETBLOCK_SINGLE_OPER);
 252 }
 253
 254 int mfCSetBlock(uint8_t blockNo, uint8_t *data, uint8_t *uid, int wantWipe, uint8_t params) {
 255         uint8_t isOK = 0;
 256
 257         UsbCommand c = {CMD_MIFARE_EML_CSETBLOCK, {wantWipe, params & (0xFE | (uid == NULL ? 0:1)), blockNo}};
 258         memcpy(c.d.asBytes, data, 16);
 259         SendCommand(&c);
 260
 261   UsbCommand resp;
 262         if (WaitForResponseTimeout(CMD_ACK,&resp,1500)) {
 263                 isOK  = resp.arg[0] & 0xff;
 264                 if (uid != NULL) memcpy(uid, resp.d.asBytes, 4);
 265                 if (!isOK) return 2;
 266         } else {
 267                 PrintAndLog("Command execute timeout");
 268                 return 1;
 269         }
 270         return 0;
 271 }
 272
 273 int mfCGetBlock(uint8_t blockNo, uint8_t *data, uint8_t params) {
 274         uint8_t isOK = 0;
 275
 276         UsbCommand c = {CMD_MIFARE_EML_CGETBLOCK, {params, 0, blockNo}};
 277         SendCommand(&c);
 278
 279   UsbCommand resp;
 280         if (WaitForResponseTimeout(CMD_ACK,&resp,1500)) {
 281                 isOK  = resp.arg[0] & 0xff;
 282                 memcpy(data, resp.d.asBytes, 16);
 283                 if (!isOK) return 2;
 284         } else {
 285                 PrintAndLog("Command execute timeout");
 286                 return 1;
 287         }
 288         return 0;
 289 }
 290
 291 // SNIFFER
 292
 293 // constants
 294 static uint8_t trailerAccessBytes[4] = {0x08, 0x77, 0x8F, 0x00};
 295
 296 // variables
 297 char logHexFileName[200] = {0x00};
 298 static uint8_t traceCard[4096] = {0x00};
 299 static char traceFileName[200] = {0};
 300 static int traceState = TRACE_IDLE;
 301 static uint8_t traceCurBlock = 0;
 302 static uint8_t traceCurKey = 0;
 303
 304 struct Crypto1State *traceCrypto1 = NULL;
 305
 306 struct Crypto1State *revstate;
 307 uint64_t lfsr;
 308 uint32_t ks2;
 309 uint32_t ks3;
 310
 311 uint32_t uid;     // serial number
 312 uint32_t nt;      // tag challenge
 313 uint32_t nt_par;
 314 uint32_t nr_enc;  // encrypted reader challenge
 315 uint32_t ar_enc;  // encrypted reader response
 316 uint32_t nr_ar_par;
 317 uint32_t at_enc;  // encrypted tag response
 318 uint32_t at_par;
 319
 320 int isTraceCardEmpty(void) {
 321         return ((traceCard[0] == 0) && (traceCard[1] == 0) && (traceCard[2] == 0) && (traceCard[3] == 0));
 322 }
 323
 324 int isBlockEmpty(int blockN) {
 325         for (int i = 0; i < 16; i++)
 326                 if (traceCard[blockN * 16 + i] != 0) return 0;
 327
 328         return 1;
 329 }
 330
 331 int isBlockTrailer(int blockN) {
 332  return ((blockN & 0x03) == 0x03);
 333 }
 334
 335 int loadTraceCard(uint8_t *tuid) {
 336         FILE * f;
 337         char buf[64];
 338         uint8_t buf8[64];
 339         int i, blockNum;
 340
 341         if (!isTraceCardEmpty()) saveTraceCard();
 342         memset(traceCard, 0x00, 4096);
 343         memcpy(traceCard, tuid + 3, 4);
 344         FillFileNameByUID(traceFileName, tuid, ".eml", 7);
 345
 346         f = fopen(traceFileName, "r");
 347         if (!f) return 1;
 348
 349         blockNum = 0;
 350         while(!feof(f)){
 351                 memset(buf, 0, sizeof(buf));
 352                 if (fgets(buf, sizeof(buf), f) == NULL) {
 353       PrintAndLog("File reading error.");
 354                         return 2;
 355     }
 356
 357                 if (strlen(buf) < 32){
 358                         if (feof(f)) break;
 359                         PrintAndLog("File content error. Block data must include 32 HEX symbols");
 360                         return 2;
 361                 }
 362                 for (i = 0; i < 32; i += 2)
 363                         sscanf(&buf[i], "%02x", (unsigned int *)&buf8[i / 2]);
 364
 365                 memcpy(traceCard + blockNum * 16, buf8, 16);
 366
 367                 blockNum++;
 368         }
 369         fclose(f);
 370
 371         return 0;
 372 }
 373
 374 int saveTraceCard(void) {
 375         FILE * f;
 376
 377         if ((!strlen(traceFileName)) || (isTraceCardEmpty())) return 0;
 378
 379         f = fopen(traceFileName, "w+");
 380         for (int i = 0; i < 64; i++) {  // blocks
 381                 for (int j = 0; j < 16; j++)  // bytes
 382                         fprintf(f, "%02x", *(traceCard + i * 16 + j));
 383                 fprintf(f,"\n");
 384         }
 385         fclose(f);
 386
 387         return 0;
 388 }
 389
 390 int mfTraceInit(uint8_t *tuid, uint8_t *atqa, uint8_t sak, bool wantSaveToEmlFile) {
 391
 392         if (traceCrypto1) crypto1_destroy(traceCrypto1);
 393         traceCrypto1 = NULL;
 394
 395         if (wantSaveToEmlFile) loadTraceCard(tuid);
 396         traceCard[4] = traceCard[0] ^ traceCard[1] ^ traceCard[2] ^ traceCard[3];
 397         traceCard[5] = sak;
 398         memcpy(&traceCard[6], atqa, 2);
 399         traceCurBlock = 0;
 400         uid = bytes_to_num(tuid + 3, 4);
 401
 402         traceState = TRACE_IDLE;
 403
 404         return 0;
 405 }
 406
 407 void mf_crypto1_decrypt(struct Crypto1State *pcs, uint8_t *data, int len, bool isEncrypted){
 408         uint8_t bt = 0;
 409         int i;
 410
 411         if (len != 1) {
 412                 for (i = 0; i < len; i++)
 413                         data[i] = crypto1_byte(pcs, 0x00, isEncrypted) ^ data[i];
 414         } else {
 415                 bt = 0;
 416                 for (i = 0; i < 4; i++)
 417                         bt |= (crypto1_bit(pcs, 0, isEncrypted) ^ BIT(data[0], i)) << i;
 418
 419                 data[0] = bt;
 420         }
 421         return;
 422 }
 423
 424
 425 int mfTraceDecode(uint8_t *data_src, int len, uint32_t parity, bool wantSaveToEmlFile) {
 426         uint8_t data[64];
 427
 428         if (traceState == TRACE_ERROR) return 1;
 429         if (len > 64) {
 430                 traceState = TRACE_ERROR;
 431                 return 1;
 432         }
 433
 434         memcpy(data, data_src, len);
 435         if ((traceCrypto1) && ((traceState == TRACE_IDLE) || (traceState > TRACE_AUTH_OK))) {
 436                 mf_crypto1_decrypt(traceCrypto1, data, len, 0);
 437                 PrintAndLog("dec> %s", sprint_hex(data, len));
 438                 AddLogHex(logHexFileName, "dec> ", data, len);
 439         }
 440
 441         switch (traceState) {
 442         case TRACE_IDLE:
 443                 // check packet crc16!
 444                 if ((len >= 4) && (!CheckCrc14443(CRC_14443_A, data, len))) {
 445                         PrintAndLog("dec> CRC ERROR!!!");
 446                         AddLogLine(logHexFileName, "dec> ", "CRC ERROR!!!");
 447                         traceState = TRACE_ERROR;  // do not decrypt the next commands
 448                         return 1;
 449                 }
 450
 451                 // AUTHENTICATION
 452                 if ((len ==4) && ((data[0] == 0x60) || (data[0] == 0x61))) {
 453                         traceState = TRACE_AUTH1;
 454                         traceCurBlock = data[1];
 455                         traceCurKey = data[0] == 60 ? 1:0;
 456                         return 0;
 457                 }
 458
 459                 // READ
 460                 if ((len ==4) && ((data[0] == 0x30))) {
 461                         traceState = TRACE_READ_DATA;
 462                         traceCurBlock = data[1];
 463                         return 0;
 464                 }
 465
 466                 // WRITE
 467                 if ((len ==4) && ((data[0] == 0xA0))) {
 468                         traceState = TRACE_WRITE_OK;
 469                         traceCurBlock = data[1];
 470                         return 0;
 471                 }
 472
 473                 // HALT
 474                 if ((len ==4) && ((data[0] == 0x50) && (data[1] == 0x00))) {
 475                         traceState = TRACE_ERROR;  // do not decrypt the next commands
 476                         return 0;
 477                 }
 478
 479                 return 0;
 480         break;
 481
 482         case TRACE_READ_DATA:
 483                 if (len == 18) {
 484                         traceState = TRACE_IDLE;
 485
 486                         if (isBlockTrailer(traceCurBlock)) {
 487                                 memcpy(traceCard + traceCurBlock * 16 + 6, data + 6, 4);
 488                         } else {
 489                                 memcpy(traceCard + traceCurBlock * 16, data, 16);
 490                         }
 491                         if (wantSaveToEmlFile) saveTraceCard();
 492                         return 0;
 493                 } else {
 494                         traceState = TRACE_ERROR;
 495                         return 1;
 496                 }
 497         break;
 498
 499         case TRACE_WRITE_OK:
 500                 if ((len == 1) && (data[0] == 0x0a)) {
 501                         traceState = TRACE_WRITE_DATA;
 502
 503                         return 0;
 504                 } else {
 505                         traceState = TRACE_ERROR;
 506                         return 1;
 507                 }
 508         break;
 509
 510         case TRACE_WRITE_DATA:
 511                 if (len == 18) {
 512                         traceState = TRACE_IDLE;
 513
 514                         memcpy(traceCard + traceCurBlock * 16, data, 16);
 515                         if (wantSaveToEmlFile) saveTraceCard();
 516                         return 0;
 517                 } else {
 518                         traceState = TRACE_ERROR;
 519                         return 1;
 520                 }
 521         break;
 522
 523         case TRACE_AUTH1:
 524                 if (len == 4) {
 525                         traceState = TRACE_AUTH2;
 526
 527                         nt = bytes_to_num(data, 4);
 528                         nt_par = parity;
 529                         return 0;
 530                 } else {
 531                         traceState = TRACE_ERROR;
 532                         return 1;
 533                 }
 534         break;
 535
 536         case TRACE_AUTH2:
 537                 if (len == 8) {
 538                         traceState = TRACE_AUTH_OK;
 539
 540                         nr_enc = bytes_to_num(data, 4);
 541                         ar_enc = bytes_to_num(data + 4, 4);
 542                         nr_ar_par = parity;
 543                         return 0;
 544                 } else {
 545                         traceState = TRACE_ERROR;
 546                         return 1;
 547                 }
 548         break;
 549
 550         case TRACE_AUTH_OK:
 551                 if (len ==4) {
 552                         traceState = TRACE_IDLE;
 553
 554                         at_enc = bytes_to_num(data, 4);
 555                         at_par = parity;
 556
 557                         //  decode key here)
 558                         ks2 = ar_enc ^ prng_successor(nt, 64);
 559                         ks3 = at_enc ^ prng_successor(nt, 96);
 560                         revstate = lfsr_recovery64(ks2, ks3);
 561                         lfsr_rollback_word(revstate, 0, 0);
 562                         lfsr_rollback_word(revstate, 0, 0);
 563                         lfsr_rollback_word(revstate, nr_enc, 1);
 564                         lfsr_rollback_word(revstate, uid ^ nt, 0);
 565                         crypto1_get_lfsr(revstate, &lfsr);
 566                         printf("key> %x%x\n", (unsigned int)((lfsr & 0xFFFFFFFF00000000) >> 32), (unsigned int)(lfsr & 0xFFFFFFFF));
 567                         AddLogUint64(logHexFileName, "key> ", lfsr);
 568
 569                         int blockShift = ((traceCurBlock & 0xFC) + 3) * 16;
 570                         if (isBlockEmpty((traceCurBlock & 0xFC) + 3)) memcpy(traceCard + blockShift + 6, trailerAccessBytes, 4);
 571
 572                         if (traceCurKey) {
 573                                 num_to_bytes(lfsr, 6, traceCard + blockShift + 10);
 574                         } else {
 575                                 num_to_bytes(lfsr, 6, traceCard + blockShift);
 576                         }
 577                         if (wantSaveToEmlFile) saveTraceCard();
 578
 579                         if (traceCrypto1) {
 580                                 crypto1_destroy(traceCrypto1);
 581                         }
 582
 583                         // set cryptosystem state
 584                         traceCrypto1 = lfsr_recovery64(ks2, ks3);
 585
 586 //      nt = crypto1_word(traceCrypto1, nt ^ uid, 1) ^ nt;
 587
 588         /*      traceCrypto1 = crypto1_create(lfsr); // key in lfsr
 589                 crypto1_word(traceCrypto1, nt ^ uid, 0);
 590                 crypto1_word(traceCrypto1, ar, 1);
 591                 crypto1_word(traceCrypto1, 0, 0);
 592                 crypto1_word(traceCrypto1, 0, 0);*/
 593
 594                         return 0;
 595                 } else {
 596                         traceState = TRACE_ERROR;
 597                         return 1;
 598                 }
 599         break;
 600
 601         default:
 602                 traceState = TRACE_ERROR;
 603                 return 1;
 604         }
 605
 606         return 0;
 607 }