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