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Merge branch 'master' of https://github.com/Proxmark/proxmark3
[proxmark3-svn] / 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 StateList_t statelists[2];
76 struct Crypto1State *p1, *p2, *p3, *p4;
77
78 // flush queue
79 WaitForResponseTimeout(CMD_ACK,NULL,100);
80
81 UsbCommand c = {CMD_MIFARE_NESTED, {blockNo + keyType * 0x100, trgBlockNo + trgKeyType * 0x100, calibrate}};
82 memcpy(c.d.asBytes, key, 6);
83 SendCommand(&c);
84
85 if (WaitForResponseTimeout(CMD_ACK,&resp,1500)) {
86 len = resp.arg[1];
87 if (len == 2) {
88 memcpy(&uid, resp.d.asBytes, 4);
89 PrintAndLog("uid:%08x len=%d trgbl=%d trgkey=%x", uid, len, (uint16_t)resp.arg[2] & 0xff, (uint16_t)resp.arg[2] >> 8);
90
91 for (i = 0; i < 2; i++) {
92 statelists[i].blockNo = resp.arg[2] & 0xff;
93 statelists[i].keyType = (resp.arg[2] >> 8) & 0xff;
94 statelists[i].uid = uid;
95
96 memcpy(&statelists[i].nt, (void *)(resp.d.asBytes + 4 + i * 8 + 0), 4);
97 memcpy(&statelists[i].ks1, (void *)(resp.d.asBytes + 4 + i * 8 + 4), 4);
98 }
99 }
100 else {
101 PrintAndLog("Got 0 keys from proxmark.");
102 return 1;
103 }
104 }
105
106 // calc keys
107
108 pthread_t thread_id[2];
109
110 // create and run worker threads
111 for (i = 0; i < 2; i++) {
112 pthread_create(thread_id + i, NULL, nested_worker_thread, &statelists[i]);
113 }
114
115 // wait for threads to terminate:
116 for (i = 0; i < 2; i++) {
117 pthread_join(thread_id[i], (void*)&statelists[i].head.slhead);
118 }
119
120
121 // the first 16 Bits of the cryptostate already contain part of our key.
122 // Create the intersection of the two lists based on these 16 Bits and
123 // roll back the cryptostate
124 p1 = p3 = statelists[0].head.slhead;
125 p2 = p4 = statelists[1].head.slhead;
126 while (p1 <= statelists[0].tail.sltail && p2 <= statelists[1].tail.sltail) {
127 if (Compare16Bits(p1, p2) == 0) {
128 struct Crypto1State savestate, *savep = &savestate;
129 savestate = *p1;
130 while(Compare16Bits(p1, savep) == 0 && p1 <= statelists[0].tail.sltail) {
131 *p3 = *p1;
132 lfsr_rollback_word(p3, statelists[0].nt ^ statelists[0].uid, 0);
133 p3++;
134 p1++;
135 }
136 savestate = *p2;
137 while(Compare16Bits(p2, savep) == 0 && p2 <= statelists[1].tail.sltail) {
138 *p4 = *p2;
139 lfsr_rollback_word(p4, statelists[1].nt ^ statelists[1].uid, 0);
140 p4++;
141 p2++;
142 }
143 }
144 else {
145 while (Compare16Bits(p1, p2) == -1) p1++;
146 while (Compare16Bits(p1, p2) == 1) p2++;
147 }
148 }
149 p3->even = 0; p3->odd = 0;
150 p4->even = 0; p4->odd = 0;
151 statelists[0].len = p3 - statelists[0].head.slhead;
152 statelists[1].len = p4 - statelists[1].head.slhead;
153 statelists[0].tail.sltail=--p3;
154 statelists[1].tail.sltail=--p4;
155
156 // the statelists now contain possible keys. The key we are searching for must be in the
157 // intersection of both lists. Create the intersection:
158 qsort(statelists[0].head.keyhead, statelists[0].len, sizeof(uint64_t), compar_int);
159 qsort(statelists[1].head.keyhead, statelists[1].len, sizeof(uint64_t), compar_int);
160
161 uint64_t *p5, *p6, *p7;
162 p5 = p7 = statelists[0].head.keyhead;
163 p6 = statelists[1].head.keyhead;
164 while (p5 <= statelists[0].tail.keytail && p6 <= statelists[1].tail.keytail) {
165 if (compar_int(p5, p6) == 0) {
166 *p7++ = *p5++;
167 p6++;
168 }
169 else {
170 while (compar_int(p5, p6) == -1) p5++;
171 while (compar_int(p5, p6) == 1) p6++;
172 }
173 }
174 statelists[0].len = p7 - statelists[0].head.keyhead;
175 statelists[0].tail.keytail=--p7;
176
177 memset(resultKey, 0, 6);
178 // The list may still contain several key candidates. Test each of them with mfCheckKeys
179 for (i = 0; i < statelists[0].len; i++) {
180 uint8_t keyBlock[6];
181 uint64_t key64;
182 crypto1_get_lfsr(statelists[0].head.slhead + i, &key64);
183 num_to_bytes(key64, 6, keyBlock);
184 key64 = 0;
185 if (!mfCheckKeys(statelists[0].blockNo, statelists[0].keyType, 1, keyBlock, &key64)) {
186 num_to_bytes(key64, 6, resultKey);
187 break;
188 }
189 }
190
191 free(statelists[0].head.slhead);
192 free(statelists[1].head.slhead);
193
194 return 0;
195 }
196
197 int mfCheckKeys (uint8_t blockNo, uint8_t keyType, uint8_t keycnt, uint8_t * keyBlock, uint64_t * key){
198
199 *key = 0;
200
201 UsbCommand c = {CMD_MIFARE_CHKKEYS, {blockNo, keyType, keycnt}};
202 memcpy(c.d.asBytes, keyBlock, 6 * keycnt);
203 SendCommand(&c);
204
205 UsbCommand resp;
206 if (!WaitForResponseTimeout(CMD_ACK,&resp,3000)) return 1;
207 if ((resp.arg[0] & 0xff) != 0x01) return 2;
208 *key = bytes_to_num(resp.d.asBytes, 6);
209 return 0;
210 }
211
212 // EMULATOR
213
214 int mfEmlGetMem(uint8_t *data, int blockNum, int blocksCount) {
215 UsbCommand c = {CMD_MIFARE_EML_MEMGET, {blockNum, blocksCount, 0}};
216 SendCommand(&c);
217
218 UsbCommand resp;
219 if (!WaitForResponseTimeout(CMD_ACK,&resp,1500)) return 1;
220 memcpy(data, resp.d.asBytes, blocksCount * 16);
221 return 0;
222 }
223
224 int mfEmlSetMem(uint8_t *data, int blockNum, int blocksCount) {
225 UsbCommand c = {CMD_MIFARE_EML_MEMSET, {blockNum, blocksCount, 0}};
226 memcpy(c.d.asBytes, data, blocksCount * 16);
227 SendCommand(&c);
228 return 0;
229 }
230
231 // "MAGIC" CARD
232
233 int mfCSetUID(uint8_t *uid, uint8_t *oldUID, bool wantWipe) {
234
235 uint8_t oldblock0[16] = {0x00};
236 uint8_t block0[16] = {0x00};
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] = 0x08;
241 //block0[6] = 0x04;
242 //block0[7] = 0x00;
243
244 block0[5] = 0x01; //sak
245 block0[6] = 0x01;
246 block0[7] = 0x0f;
247
248 int old = mfCGetBlock(0, oldblock0, CSETBLOCK_SINGLE_OPER);
249 if ( old == 0) {
250 memcpy(block0+8, oldblock0+8, 8);
251 PrintAndLog("block 0: %s", sprint_hex(block0,16));
252 } else {
253 PrintAndLog("Couldn't get olddata. Will write over the last bytes of Block 0.");
254 }
255 return mfCSetBlock(0, block0, oldUID, wantWipe, CSETBLOCK_SINGLE_OPER);
256 }
257
258 int mfCSetBlock(uint8_t blockNo, uint8_t *data, uint8_t *uid, bool wantWipe, uint8_t params) {
259
260 uint8_t isOK = 0;
261 UsbCommand c = {CMD_MIFARE_CSETBLOCK, {wantWipe, params & (0xFE | (uid == NULL ? 0:1)), blockNo}};
262 memcpy(c.d.asBytes, data, 16);
263 SendCommand(&c);
264
265 UsbCommand resp;
266 if (WaitForResponseTimeout(CMD_ACK,&resp,1500)) {
267 isOK = resp.arg[0] & 0xff;
268 if (uid != NULL)
269 memcpy(uid, resp.d.asBytes, 4);
270 if (!isOK)
271 return 2;
272 } else {
273 PrintAndLog("Command execute timeout");
274 return 1;
275 }
276 return 0;
277 }
278
279 int mfCGetBlock(uint8_t blockNo, uint8_t *data, uint8_t params) {
280 uint8_t isOK = 0;
281
282 UsbCommand c = {CMD_MIFARE_CGETBLOCK, {params, 0, blockNo}};
283 SendCommand(&c);
284
285 UsbCommand resp;
286 if (WaitForResponseTimeout(CMD_ACK,&resp,1500)) {
287 isOK = resp.arg[0] & 0xff;
288 memcpy(data, resp.d.asBytes, 16);
289 if (!isOK) return 2;
290 } else {
291 PrintAndLog("Command execute timeout");
292 return 1;
293 }
294 return 0;
295 }
296
297 // SNIFFER
298
299 // constants
300 static uint8_t trailerAccessBytes[4] = {0x08, 0x77, 0x8F, 0x00};
301
302 // variables
303 char logHexFileName[FILE_PATH_SIZE] = {0x00};
304 static uint8_t traceCard[4096] = {0x00};
305 static char traceFileName[FILE_PATH_SIZE] = {0x00};
306 static int traceState = TRACE_IDLE;
307 static uint8_t traceCurBlock = 0;
308 static uint8_t traceCurKey = 0;
309
310 struct Crypto1State *traceCrypto1 = NULL;
311
312 struct Crypto1State *revstate;
313 uint64_t lfsr;
314 uint32_t ks2;
315 uint32_t ks3;
316
317 uint32_t uid; // serial number
318 uint32_t nt; // tag challenge
319 uint32_t nr_enc; // encrypted reader challenge
320 uint32_t ar_enc; // encrypted reader response
321 uint32_t at_enc; // encrypted tag response
322
323 int isTraceCardEmpty(void) {
324 return ((traceCard[0] == 0) && (traceCard[1] == 0) && (traceCard[2] == 0) && (traceCard[3] == 0));
325 }
326
327 int isBlockEmpty(int blockN) {
328 for (int i = 0; i < 16; i++)
329 if (traceCard[blockN * 16 + i] != 0) return 0;
330
331 return 1;
332 }
333
334 int isBlockTrailer(int blockN) {
335 return ((blockN & 0x03) == 0x03);
336 }
337
338 int loadTraceCard(uint8_t *tuid) {
339 FILE * f;
340 char buf[64] = {0x00};
341 uint8_t buf8[64] = {0x00};
342 int i, blockNum;
343
344 if (!isTraceCardEmpty())
345 saveTraceCard();
346
347 memset(traceCard, 0x00, 4096);
348 memcpy(traceCard, tuid + 3, 4);
349
350 FillFileNameByUID(traceFileName, tuid, ".eml", 7);
351
352 f = fopen(traceFileName, "r");
353 if (!f) {
354 fclose(f);
355 return 1;
356 }
357
358 blockNum = 0;
359
360 while(!feof(f)){
361
362 memset(buf, 0, sizeof(buf));
363 if (fgets(buf, sizeof(buf), f) == NULL) {
364 PrintAndLog("File reading error.");
365 fclose(f);
366 return 2;
367 }
368
369 if (strlen(buf) < 32){
370 if (feof(f)) break;
371 PrintAndLog("File content error. Block data must include 32 HEX symbols");
372 fclose(f);
373 return 2;
374 }
375 for (i = 0; i < 32; i += 2)
376 sscanf(&buf[i], "%02x", (unsigned int *)&buf8[i / 2]);
377
378 memcpy(traceCard + blockNum * 16, buf8, 16);
379
380 blockNum++;
381 }
382 fclose(f);
383
384 return 0;
385 }
386
387 int saveTraceCard(void) {
388 FILE * f;
389
390 if ((!strlen(traceFileName)) || (isTraceCardEmpty())) return 0;
391
392 f = fopen(traceFileName, "w+");
393 if ( !f ) {
394 fclose(f);
395 return 1;
396 }
397
398 for (int i = 0; i < 64; i++) { // blocks
399 for (int j = 0; j < 16; j++) // bytes
400 fprintf(f, "%02x", *(traceCard + i * 16 + j));
401 fprintf(f,"\n");
402 }
403 fclose(f);
404 return 0;
405 }
406
407 int mfTraceInit(uint8_t *tuid, uint8_t *atqa, uint8_t sak, bool wantSaveToEmlFile) {
408
409 if (traceCrypto1)
410 crypto1_destroy(traceCrypto1);
411
412 traceCrypto1 = NULL;
413
414 if (wantSaveToEmlFile)
415 loadTraceCard(tuid);
416
417 traceCard[4] = traceCard[0] ^ traceCard[1] ^ traceCard[2] ^ traceCard[3];
418 traceCard[5] = sak;
419 memcpy(&traceCard[6], atqa, 2);
420 traceCurBlock = 0;
421 uid = bytes_to_num(tuid + 3, 4);
422
423 traceState = TRACE_IDLE;
424
425 return 0;
426 }
427
428 void mf_crypto1_decrypt(struct Crypto1State *pcs, uint8_t *data, int len, bool isEncrypted){
429 uint8_t bt = 0;
430 int i;
431
432 if (len != 1) {
433 for (i = 0; i < len; i++)
434 data[i] = crypto1_byte(pcs, 0x00, isEncrypted) ^ data[i];
435 } else {
436 bt = 0;
437 for (i = 0; i < 4; i++)
438 bt |= (crypto1_bit(pcs, 0, isEncrypted) ^ BIT(data[0], i)) << i;
439
440 data[0] = bt;
441 }
442 return;
443 }
444
445
446 int mfTraceDecode(uint8_t *data_src, int len, bool wantSaveToEmlFile) {
447 uint8_t data[64];
448
449 if (traceState == TRACE_ERROR) return 1;
450 if (len > 64) {
451 traceState = TRACE_ERROR;
452 return 1;
453 }
454
455 memcpy(data, data_src, len);
456 if ((traceCrypto1) && ((traceState == TRACE_IDLE) || (traceState > TRACE_AUTH_OK))) {
457 mf_crypto1_decrypt(traceCrypto1, data, len, 0);
458 PrintAndLog("dec> %s", sprint_hex(data, len));
459 AddLogHex(logHexFileName, "dec> ", data, len);
460 }
461
462 switch (traceState) {
463 case TRACE_IDLE:
464 // check packet crc16!
465 if ((len >= 4) && (!CheckCrc14443(CRC_14443_A, data, len))) {
466 PrintAndLog("dec> CRC ERROR!!!");
467 AddLogLine(logHexFileName, "dec> ", "CRC ERROR!!!");
468 traceState = TRACE_ERROR; // do not decrypt the next commands
469 return 1;
470 }
471
472 // AUTHENTICATION
473 if ((len == 4) && ((data[0] == 0x60) || (data[0] == 0x61))) {
474 traceState = TRACE_AUTH1;
475 traceCurBlock = data[1];
476 traceCurKey = data[0] == 60 ? 1:0;
477 return 0;
478 }
479
480 // READ
481 if ((len ==4) && ((data[0] == 0x30))) {
482 traceState = TRACE_READ_DATA;
483 traceCurBlock = data[1];
484 return 0;
485 }
486
487 // WRITE
488 if ((len ==4) && ((data[0] == 0xA0))) {
489 traceState = TRACE_WRITE_OK;
490 traceCurBlock = data[1];
491 return 0;
492 }
493
494 // HALT
495 if ((len ==4) && ((data[0] == 0x50) && (data[1] == 0x00))) {
496 traceState = TRACE_ERROR; // do not decrypt the next commands
497 return 0;
498 }
499
500 return 0;
501 break;
502
503 case TRACE_READ_DATA:
504 if (len == 18) {
505 traceState = TRACE_IDLE;
506
507 if (isBlockTrailer(traceCurBlock)) {
508 memcpy(traceCard + traceCurBlock * 16 + 6, data + 6, 4);
509 } else {
510 memcpy(traceCard + traceCurBlock * 16, data, 16);
511 }
512 if (wantSaveToEmlFile) saveTraceCard();
513 return 0;
514 } else {
515 traceState = TRACE_ERROR;
516 return 1;
517 }
518 break;
519
520 case TRACE_WRITE_OK:
521 if ((len == 1) && (data[0] == 0x0a)) {
522 traceState = TRACE_WRITE_DATA;
523
524 return 0;
525 } else {
526 traceState = TRACE_ERROR;
527 return 1;
528 }
529 break;
530
531 case TRACE_WRITE_DATA:
532 if (len == 18) {
533 traceState = TRACE_IDLE;
534
535 memcpy(traceCard + traceCurBlock * 16, data, 16);
536 if (wantSaveToEmlFile) saveTraceCard();
537 return 0;
538 } else {
539 traceState = TRACE_ERROR;
540 return 1;
541 }
542 break;
543
544 case TRACE_AUTH1:
545 if (len == 4) {
546 traceState = TRACE_AUTH2;
547 nt = bytes_to_num(data, 4);
548 return 0;
549 } else {
550 traceState = TRACE_ERROR;
551 return 1;
552 }
553 break;
554
555 case TRACE_AUTH2:
556 if (len == 8) {
557 traceState = TRACE_AUTH_OK;
558
559 nr_enc = bytes_to_num(data, 4);
560 ar_enc = bytes_to_num(data + 4, 4);
561 return 0;
562 } else {
563 traceState = TRACE_ERROR;
564 return 1;
565 }
566 break;
567
568 case TRACE_AUTH_OK:
569 if (len ==4) {
570 traceState = TRACE_IDLE;
571
572 at_enc = bytes_to_num(data, 4);
573
574 // decode key here)
575 ks2 = ar_enc ^ prng_successor(nt, 64);
576 ks3 = at_enc ^ prng_successor(nt, 96);
577 revstate = lfsr_recovery64(ks2, ks3);
578 lfsr_rollback_word(revstate, 0, 0);
579 lfsr_rollback_word(revstate, 0, 0);
580 lfsr_rollback_word(revstate, nr_enc, 1);
581 lfsr_rollback_word(revstate, uid ^ nt, 0);
582
583 crypto1_get_lfsr(revstate, &lfsr);
584 printf("key> %x%x\n", (unsigned int)((lfsr & 0xFFFFFFFF00000000) >> 32), (unsigned int)(lfsr & 0xFFFFFFFF));
585 AddLogUint64(logHexFileName, "key> ", lfsr);
586
587 int blockShift = ((traceCurBlock & 0xFC) + 3) * 16;
588 if (isBlockEmpty((traceCurBlock & 0xFC) + 3)) memcpy(traceCard + blockShift + 6, trailerAccessBytes, 4);
589
590 if (traceCurKey) {
591 num_to_bytes(lfsr, 6, traceCard + blockShift + 10);
592 } else {
593 num_to_bytes(lfsr, 6, traceCard + blockShift);
594 }
595 if (wantSaveToEmlFile) saveTraceCard();
596
597 if (traceCrypto1) {
598 crypto1_destroy(traceCrypto1);
599 }
600
601 // set cryptosystem state
602 traceCrypto1 = lfsr_recovery64(ks2, ks3);
603
604 // nt = crypto1_word(traceCrypto1, nt ^ uid, 1) ^ nt;
605
606 /* traceCrypto1 = crypto1_create(lfsr); // key in lfsr
607 crypto1_word(traceCrypto1, nt ^ uid, 0);
608 crypto1_word(traceCrypto1, ar, 1);
609 crypto1_word(traceCrypto1, 0, 0);
610 crypto1_word(traceCrypto1, 0, 0);*/
611
612 return 0;
613 } else {
614 traceState = TRACE_ERROR;
615 return 1;
616 }
617 break;
618
619 default:
620 traceState = TRACE_ERROR;
621 return 1;
622 }
623
624 return 0;
625 }
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