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ADD: @piwi's fixes to "hf snoop" where it empties the bigbuffer before snooping.
[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 #define llx PRIx64
19
20 // MIFARE
21 int compar_int(const void * a, const void * b) {
22 // didn't work: (the result is truncated to 32 bits)
23 //return (*(uint64_t*)b - *(uint64_t*)a);
24
25 // better:
26 if (*(uint64_t*)b == *(uint64_t*)a) return 0;
27 else if (*(uint64_t*)b > *(uint64_t*)a) return 1;
28 else return -1;
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 typedef
39 struct {
40 union {
41 struct Crypto1State *slhead;
42 uint64_t *keyhead;
43 } head;
44 union {
45 struct Crypto1State *sltail;
46 uint64_t *keytail;
47 } tail;
48 uint32_t len;
49 uint32_t uid;
50 uint32_t blockNo;
51 uint32_t keyType;
52 uint32_t nt;
53 uint32_t ks1;
54 } StateList_t;
55
56
57 // wrapper function for multi-threaded lfsr_recovery32
58 void* nested_worker_thread(void *arg)
59 {
60 struct Crypto1State *p1;
61 StateList_t *statelist = arg;
62
63 statelist->head.slhead = lfsr_recovery32(statelist->ks1, statelist->nt ^ statelist->uid);
64 for (p1 = statelist->head.slhead; *(uint64_t *)p1 != 0; p1++);
65 statelist->len = p1 - statelist->head.slhead;
66 statelist->tail.sltail = --p1;
67 qsort(statelist->head.slhead, statelist->len, sizeof(uint64_t), Compare16Bits);
68
69 return statelist->head.slhead;
70 }
71
72 int mfnested(uint8_t blockNo, uint8_t keyType, uint8_t * key, uint8_t trgBlockNo, uint8_t trgKeyType, uint8_t * resultKey, bool calibrate)
73 {
74 uint16_t i;
75 uint32_t uid;
76 UsbCommand resp;
77
78 StateList_t statelists[2];
79 struct Crypto1State *p1, *p2, *p3, *p4;
80
81 // flush queue
82 WaitForResponseTimeout(CMD_ACK,NULL,100);
83
84 UsbCommand c = {CMD_MIFARE_NESTED, {blockNo + keyType * 0x100, trgBlockNo + trgKeyType * 0x100, calibrate}};
85 memcpy(c.d.asBytes, key, 6);
86 SendCommand(&c);
87
88 if (!WaitForResponseTimeout(CMD_ACK, &resp, 1500)) {
89 return -1;
90 }
91
92 if (resp.arg[0]) {
93 return resp.arg[0]; // error during nested
94 }
95
96 memcpy(&uid, resp.d.asBytes, 4);
97 PrintAndLog("uid:%08x trgbl=%d trgkey=%x", uid, (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 memcpy(&statelists[i].nt, (void *)(resp.d.asBytes + 4 + i * 8 + 0), 4);
104 memcpy(&statelists[i].ks1, (void *)(resp.d.asBytes + 4 + i * 8 + 4), 4);
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, false, 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 return 0;
195 }
196
197 int mfCheckKeys (uint8_t blockNo, uint8_t keyType, bool clear_trace, uint8_t keycnt, uint8_t * keyBlock, uint64_t * key){
198
199 *key = 0;
200
201 UsbCommand c = {CMD_MIFARE_CHKKEYS, {((blockNo & 0xff) | ((keyType&0xff)<<8)), clear_trace, keycnt}};
202 memcpy(c.d.asBytes, keyBlock, 6 * keycnt);
203
204 clearCommandBuffer();
205 SendCommand(&c);
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 clearCommandBuffer();
218 SendCommand(&c);
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 return mfEmlSetMem_xt(data, blockNum, blocksCount, 16);
227 }
228
229 int mfEmlSetMem_xt(uint8_t *data, int blockNum, int blocksCount, int blockBtWidth) {
230 UsbCommand c = {CMD_MIFARE_EML_MEMSET, {blockNum, blocksCount, blockBtWidth}};
231 memcpy(c.d.asBytes, data, blocksCount * blockBtWidth);
232
233 clearCommandBuffer();
234 SendCommand(&c);
235 return 0;
236 }
237
238 // "MAGIC" CARD
239
240 int mfCSetUID(uint8_t *uid, uint8_t *atqa, uint8_t *sak, uint8_t *oldUID, uint8_t wipecard) {
241
242 uint8_t params = MAGIC_SINGLE;
243 uint8_t block0[16];
244 memset(block0, 0x00, sizeof(block0));
245
246
247 int old = mfCGetBlock(0, block0, params);
248 if (old == 0) {
249 PrintAndLog("old block 0: %s", sprint_hex(block0, sizeof(block0)));
250 } else {
251 PrintAndLog("Couldn't get old data. Will write over the last bytes of Block 0.");
252 }
253
254 // fill in the new values
255 // UID
256 memcpy(block0, uid, 4);
257 // Mifare UID BCC
258 block0[4] = block0[0]^block0[1]^block0[2]^block0[3];
259 // mifare classic SAK(byte 5) and ATQA(byte 6 and 7, reversed)
260 if ( sak != NULL )
261 block0[5]=sak[0];
262
263 if ( atqa != NULL ) {
264 block0[6]=atqa[1];
265 block0[7]=atqa[0];
266 }
267 PrintAndLog("new block 0: %s", sprint_hex(block0,16));
268
269 if ( wipecard ) params |= MAGIC_WIPE;
270 if ( oldUID == NULL) params |= MAGIC_UID;
271
272 return mfCSetBlock(0, block0, oldUID, params);
273 }
274
275 int mfCSetBlock(uint8_t blockNo, uint8_t *data, uint8_t *uid, uint8_t params) {
276
277 uint8_t isOK = 0;
278 UsbCommand c = {CMD_MIFARE_CSETBLOCK, {params, blockNo, 0}};
279 memcpy(c.d.asBytes, data, 16);
280 clearCommandBuffer();
281 SendCommand(&c);
282 UsbCommand resp;
283 if (WaitForResponseTimeout(CMD_ACK, &resp, 1500)) {
284 isOK = resp.arg[0] & 0xff;
285 if (uid != NULL)
286 memcpy(uid, resp.d.asBytes, 4);
287 if (!isOK)
288 return 2;
289 } else {
290 PrintAndLog("Command execute timeout");
291 return 1;
292 }
293 return 0;
294 }
295
296 int mfCGetBlock(uint8_t blockNo, uint8_t *data, uint8_t params) {
297 uint8_t isOK = 0;
298 UsbCommand c = {CMD_MIFARE_CGETBLOCK, {params, blockNo, 0}};
299 clearCommandBuffer();
300 SendCommand(&c);
301 UsbCommand resp;
302 if (WaitForResponseTimeout(CMD_ACK,&resp,1500)) {
303 isOK = resp.arg[0] & 0xff;
304 memcpy(data, resp.d.asBytes, 16);
305 if (!isOK) return 2;
306 } else {
307 PrintAndLog("Command execute timeout");
308 return 1;
309 }
310 return 0;
311 }
312
313 // SNIFFER
314
315 // constants
316 static uint8_t trailerAccessBytes[4] = {0x08, 0x77, 0x8F, 0x00};
317
318 // variables
319 char logHexFileName[FILE_PATH_SIZE] = {0x00};
320 static uint8_t traceCard[4096] = {0x00};
321 static char traceFileName[FILE_PATH_SIZE] = {0x00};
322 static int traceState = TRACE_IDLE;
323 static uint8_t traceCurBlock = 0;
324 static uint8_t traceCurKey = 0;
325
326 struct Crypto1State *traceCrypto1 = NULL;
327
328 struct Crypto1State *revstate = NULL;
329
330 uint64_t key = 0;
331 uint32_t ks2 = 0;
332 uint32_t ks3 = 0;
333
334 uint32_t uid = 0; // serial number
335 uint32_t nt =0; // tag challenge
336 uint32_t nr_enc =0; // encrypted reader challenge
337 uint32_t ar_enc =0; // encrypted reader response
338 uint32_t at_enc =0; // encrypted tag response
339
340 int isTraceCardEmpty(void) {
341 return ((traceCard[0] == 0) && (traceCard[1] == 0) && (traceCard[2] == 0) && (traceCard[3] == 0));
342 }
343
344 int isBlockEmpty(int blockN) {
345 for (int i = 0; i < 16; i++)
346 if (traceCard[blockN * 16 + i] != 0) return 0;
347
348 return 1;
349 }
350
351 int isBlockTrailer(int blockN) {
352 return ((blockN & 0x03) == 0x03);
353 }
354
355 int loadTraceCard(uint8_t *tuid) {
356 FILE * f;
357 char buf[64] = {0x00};
358 uint8_t buf8[64] = {0x00};
359 int i, blockNum;
360
361 if (!isTraceCardEmpty())
362 saveTraceCard();
363
364 memset(traceCard, 0x00, 4096);
365 memcpy(traceCard, tuid + 3, 4);
366
367 FillFileNameByUID(traceFileName, tuid, ".eml", 7);
368
369 f = fopen(traceFileName, "r");
370 if (!f) return 1;
371
372 blockNum = 0;
373
374 while(!feof(f)){
375
376 memset(buf, 0, sizeof(buf));
377 if (fgets(buf, sizeof(buf), f) == NULL) {
378 PrintAndLog("File reading error.");
379 fclose(f);
380 return 2;
381 }
382
383 if (strlen(buf) < 32){
384 if (feof(f)) break;
385 PrintAndLog("File content error. Block data must include 32 HEX symbols");
386 fclose(f);
387 return 2;
388 }
389 for (i = 0; i < 32; i += 2)
390 sscanf(&buf[i], "%02x", (unsigned int *)&buf8[i / 2]);
391
392 memcpy(traceCard + blockNum * 16, buf8, 16);
393
394 blockNum++;
395 }
396 fclose(f);
397
398 return 0;
399 }
400
401 int saveTraceCard(void) {
402 FILE * f;
403
404 if ((!strlen(traceFileName)) || (isTraceCardEmpty())) return 0;
405
406 f = fopen(traceFileName, "w+");
407 if ( !f ) return 1;
408
409 for (int i = 0; i < 64; i++) { // blocks
410 for (int j = 0; j < 16; j++) // bytes
411 fprintf(f, "%02x", *(traceCard + i * 16 + j));
412 fprintf(f,"\n");
413 }
414 fclose(f);
415 return 0;
416 }
417
418 int mfTraceInit(uint8_t *tuid, uint8_t *atqa, uint8_t sak, bool wantSaveToEmlFile) {
419
420 if (traceCrypto1)
421 crypto1_destroy(traceCrypto1);
422
423 traceCrypto1 = NULL;
424
425 if (wantSaveToEmlFile)
426 loadTraceCard(tuid);
427
428 traceCard[4] = traceCard[0] ^ traceCard[1] ^ traceCard[2] ^ traceCard[3];
429 traceCard[5] = sak;
430 memcpy(&traceCard[6], atqa, 2);
431 traceCurBlock = 0;
432 uid = bytes_to_num(tuid + 3, 4);
433
434 traceState = TRACE_IDLE;
435
436 return 0;
437 }
438
439 void mf_crypto1_decrypt(struct Crypto1State *pcs, uint8_t *data, int len, bool isEncrypted){
440 uint8_t bt = 0;
441 int i;
442
443 if (len != 1) {
444 for (i = 0; i < len; i++)
445 data[i] = crypto1_byte(pcs, 0x00, isEncrypted) ^ data[i];
446 } else {
447 bt = 0;
448 for (i = 0; i < 4; i++)
449 bt |= (crypto1_bit(pcs, 0, isEncrypted) ^ BIT(data[0], i)) << i;
450
451 data[0] = bt;
452 }
453 return;
454 }
455
456
457 int mfTraceDecode(uint8_t *data_src, int len, bool wantSaveToEmlFile) {
458 uint8_t data[64];
459
460 if (traceState == TRACE_ERROR) return 1;
461 if (len > 64) {
462 traceState = TRACE_ERROR;
463 return 1;
464 }
465
466 memcpy(data, data_src, len);
467 if ((traceCrypto1) && ((traceState == TRACE_IDLE) || (traceState > TRACE_AUTH_OK))) {
468 mf_crypto1_decrypt(traceCrypto1, data, len, 0);
469 PrintAndLog("dec> %s", sprint_hex(data, len));
470 AddLogHex(logHexFileName, "dec> ", data, len);
471 }
472
473 switch (traceState) {
474 case TRACE_IDLE:
475 // check packet crc16!
476 if ((len >= 4) && (!CheckCrc14443(CRC_14443_A, data, len))) {
477 PrintAndLog("dec> CRC ERROR!!!");
478 AddLogLine(logHexFileName, "dec> ", "CRC ERROR!!!");
479 traceState = TRACE_ERROR; // do not decrypt the next commands
480 return 1;
481 }
482
483 // AUTHENTICATION
484 if ((len == 4) && ((data[0] == 0x60) || (data[0] == 0x61))) {
485 traceState = TRACE_AUTH1;
486 traceCurBlock = data[1];
487 traceCurKey = data[0] == 60 ? 1:0;
488 return 0;
489 }
490
491 // READ
492 if ((len ==4) && ((data[0] == 0x30))) {
493 traceState = TRACE_READ_DATA;
494 traceCurBlock = data[1];
495 return 0;
496 }
497
498 // WRITE
499 if ((len ==4) && ((data[0] == 0xA0))) {
500 traceState = TRACE_WRITE_OK;
501 traceCurBlock = data[1];
502 return 0;
503 }
504
505 // HALT
506 if ((len ==4) && ((data[0] == 0x50) && (data[1] == 0x00))) {
507 traceState = TRACE_ERROR; // do not decrypt the next commands
508 return 0;
509 }
510
511 return 0;
512 break;
513
514 case TRACE_READ_DATA:
515 if (len == 18) {
516 traceState = TRACE_IDLE;
517
518 if (isBlockTrailer(traceCurBlock)) {
519 memcpy(traceCard + traceCurBlock * 16 + 6, data + 6, 4);
520 } else {
521 memcpy(traceCard + traceCurBlock * 16, data, 16);
522 }
523 if (wantSaveToEmlFile) saveTraceCard();
524 return 0;
525 } else {
526 traceState = TRACE_ERROR;
527 return 1;
528 }
529 break;
530
531 case TRACE_WRITE_OK:
532 if ((len == 1) && (data[0] == 0x0a)) {
533 traceState = TRACE_WRITE_DATA;
534
535 return 0;
536 } else {
537 traceState = TRACE_ERROR;
538 return 1;
539 }
540 break;
541
542 case TRACE_WRITE_DATA:
543 if (len == 18) {
544 traceState = TRACE_IDLE;
545
546 memcpy(traceCard + traceCurBlock * 16, data, 16);
547 if (wantSaveToEmlFile) saveTraceCard();
548 return 0;
549 } else {
550 traceState = TRACE_ERROR;
551 return 1;
552 }
553 break;
554
555 case TRACE_AUTH1:
556 if (len == 4) {
557 traceState = TRACE_AUTH2;
558 nt = bytes_to_num(data, 4);
559 return 0;
560 } else {
561 traceState = TRACE_ERROR;
562 return 1;
563 }
564 break;
565
566 case TRACE_AUTH2:
567 if (len == 8) {
568 traceState = TRACE_AUTH_OK;
569
570 nr_enc = bytes_to_num(data, 4);
571 ar_enc = bytes_to_num(data + 4, 4);
572 return 0;
573 } else {
574 traceState = TRACE_ERROR;
575 return 1;
576 }
577 break;
578
579 case TRACE_AUTH_OK:
580 if (len ==4) {
581 traceState = TRACE_IDLE;
582
583 at_enc = bytes_to_num(data, 4);
584
585 // decode key here)
586 ks2 = ar_enc ^ prng_successor(nt, 64);
587 ks3 = at_enc ^ prng_successor(nt, 96);
588 revstate = lfsr_recovery64(ks2, ks3);
589 lfsr_rollback_word(revstate, 0, 0);
590 lfsr_rollback_word(revstate, 0, 0);
591 lfsr_rollback_word(revstate, nr_enc, 1);
592 lfsr_rollback_word(revstate, uid ^ nt, 0);
593
594 crypto1_get_lfsr(revstate, &key);
595 printf("Key: %012"llx"\n",key);
596 AddLogUint64(logHexFileName, "key: ", key);
597
598 int blockShift = ((traceCurBlock & 0xFC) + 3) * 16;
599 if (isBlockEmpty((traceCurBlock & 0xFC) + 3)) memcpy(traceCard + blockShift + 6, trailerAccessBytes, 4);
600
601 if (traceCurKey) {
602 num_to_bytes(key, 6, traceCard + blockShift + 10);
603 } else {
604 num_to_bytes(key, 6, traceCard + blockShift);
605 }
606 if (wantSaveToEmlFile) saveTraceCard();
607
608 if (traceCrypto1) {
609 crypto1_destroy(traceCrypto1);
610 }
611
612 // set cryptosystem state
613 traceCrypto1 = lfsr_recovery64(ks2, ks3);
614
615 // nt = crypto1_word(traceCrypto1, nt ^ uid, 1) ^ nt;
616
617 /* traceCrypto1 = crypto1_create(key); // key in lfsr
618 crypto1_word(traceCrypto1, nt ^ uid, 0);
619 crypto1_word(traceCrypto1, ar, 1);
620 crypto1_word(traceCrypto1, 0, 0);
621 crypto1_word(traceCrypto1, 0, 0);*/
622
623 return 0;
624 } else {
625 traceState = TRACE_ERROR;
626 return 1;
627 }
628 break;
629
630 default:
631 traceState = TRACE_ERROR;
632 return 1;
633 }
634
635 return 0;
636 }
637
638 int tryDecryptWord(uint32_t nt, uint32_t ar_enc, uint32_t at_enc, uint8_t *data, int len){
639 /*
640 uint32_t nt; // tag challenge
641 uint32_t nr_enc; // encrypted reader challenge
642 uint32_t ar_enc; // encrypted reader response
643 uint32_t at_enc; // encrypted tag response
644 */
645
646 struct Crypto1State *pcs = NULL;
647
648 ks2 = ar_enc ^ prng_successor(nt, 64);
649 ks3 = at_enc ^ prng_successor(nt, 96);
650
651 PrintAndLog("Decrypting data with:");
652 PrintAndLog(" nt: %08x",nt);
653 PrintAndLog(" ar_enc: %08x",ar_enc);
654 PrintAndLog(" at_enc: %08x",at_enc);
655 PrintAndLog("\nEncrypted data: [%s]", sprint_hex(data,len) );
656
657 pcs = lfsr_recovery64(ks2, ks3);
658 mf_crypto1_decrypt(pcs, data, len, FALSE);
659 PrintAndLog("Decrypted data: [%s]", sprint_hex(data,len) );
660 crypto1_destroy(pcs);
661 return 0;
662 }
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