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1 //-----------------------------------------------------------------------------
2 // Copyright (C) Merlok - 2017
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 // Command: hf mf list. It shows data from arm buffer.
9 //-----------------------------------------------------------------------------
10
11 #include "cmdhflist.h"
12
13 #include <stdlib.h>
14 #include <stdio.h>
15 #include <string.h>
16 #include <stdint.h>
17 #include <stdbool.h>
18 #include "util.h"
19 #include "data.h"
20 #include "ui.h"
21 #include "iso14443crc.h"
22 #include "parity.h"
23 #include "protocols.h"
24 #include "crapto1/crapto1.h"
25 #include "mifarehost.h"
26 #include "mifaredefault.h"
27
28
29 enum MifareAuthSeq {
30 masNone,
31 masNt,
32 masNrAr,
33 masAt,
34 masAuthComplete,
35 masFirstData,
36 masData,
37 masError,
38 };
39 static enum MifareAuthSeq MifareAuthState;
40 static TAuthData AuthData;
41
42 void ClearAuthData() {
43 AuthData.uid = 0;
44 AuthData.nt = 0;
45 AuthData.first_auth = true;
46 AuthData.ks2 = 0;
47 AuthData.ks3 = 0;
48 }
49
50 /**
51 * @brief iso14443A_CRC_check Checks CRC in command or response
52 * @param isResponse
53 * @param data
54 * @param len
55 * @return 0 : CRC-command, CRC not ok
56 * 1 : CRC-command, CRC ok
57 * 2 : Not crc-command
58 */
59 uint8_t iso14443A_CRC_check(bool isResponse, uint8_t* data, uint8_t len)
60 {
61 uint8_t b1,b2;
62
63 if(len <= 2) return 2;
64
65 if(isResponse & (len < 6)) return 2;
66
67 ComputeCrc14443(CRC_14443_A, data, len-2, &b1, &b2);
68 if (b1 != data[len-2] || b2 != data[len-1]) {
69 return 0;
70 } else {
71 return 1;
72 }
73 }
74
75 uint8_t mifare_CRC_check(bool isResponse, uint8_t* data, uint8_t len)
76 {
77 switch(MifareAuthState) {
78 case masNone:
79 case masError:
80 return iso14443A_CRC_check(isResponse, data, len);
81 default:
82 return 2;
83 }
84 }
85
86 void annotateIso14443a(char *exp, size_t size, uint8_t* cmd, uint8_t cmdsize)
87 {
88 switch(cmd[0])
89 {
90 case ISO14443A_CMD_WUPA:
91 snprintf(exp,size,"WUPA");
92 break;
93 case ISO14443A_CMD_ANTICOLL_OR_SELECT:{
94 // 93 20 = Anticollision (usage: 9320 - answer: 4bytes UID+1byte UID-bytes-xor)
95 // 93 70 = Select (usage: 9370+5bytes 9320 answer - answer: 1byte SAK)
96 if(cmd[1] == 0x70)
97 {
98 snprintf(exp,size,"SELECT_UID"); break;
99 }else
100 {
101 snprintf(exp,size,"ANTICOLL"); break;
102 }
103 }
104 case ISO14443A_CMD_ANTICOLL_OR_SELECT_2:{
105 //95 20 = Anticollision of cascade level2
106 //95 70 = Select of cascade level2
107 if(cmd[2] == 0x70)
108 {
109 snprintf(exp,size,"SELECT_UID-2"); break;
110 }else
111 {
112 snprintf(exp,size,"ANTICOLL-2"); break;
113 }
114 }
115 case ISO14443A_CMD_REQA:
116 snprintf(exp,size,"REQA");
117 break;
118 case ISO14443A_CMD_READBLOCK: snprintf(exp,size,"READBLOCK(%d)",cmd[1]); break;
119 case ISO14443A_CMD_WRITEBLOCK: snprintf(exp,size,"WRITEBLOCK(%d)",cmd[1]); break;
120 case ISO14443A_CMD_HALT:
121 snprintf(exp,size,"HALT");
122 MifareAuthState = masNone;
123 break;
124 case ISO14443A_CMD_RATS: snprintf(exp,size,"RATS"); break;
125 case MIFARE_CMD_INC: snprintf(exp,size,"INC(%d)",cmd[1]); break;
126 case MIFARE_CMD_DEC: snprintf(exp,size,"DEC(%d)",cmd[1]); break;
127 case MIFARE_CMD_RESTORE: snprintf(exp,size,"RESTORE(%d)",cmd[1]); break;
128 case MIFARE_CMD_TRANSFER: snprintf(exp,size,"TRANSFER(%d)",cmd[1]); break;
129 case MIFARE_AUTH_KEYA:
130 if ( cmdsize > 3) {
131 snprintf(exp,size,"AUTH-A(%d)",cmd[1]);
132 MifareAuthState = masNt;
133 } else {
134 // case MIFARE_ULEV1_VERSION : both 0x60.
135 snprintf(exp,size,"EV1 VERSION");
136 }
137 break;
138 case MIFARE_AUTH_KEYB:
139 MifareAuthState = masNt;
140 snprintf(exp,size,"AUTH-B(%d)",cmd[1]);
141 break;
142 case MIFARE_MAGICWUPC1: snprintf(exp,size,"MAGIC WUPC1"); break;
143 case MIFARE_MAGICWUPC2: snprintf(exp,size,"MAGIC WUPC2"); break;
144 case MIFARE_MAGICWIPEC: snprintf(exp,size,"MAGIC WIPEC"); break;
145 case MIFARE_ULC_AUTH_1: snprintf(exp,size,"AUTH "); break;
146 case MIFARE_ULC_AUTH_2: snprintf(exp,size,"AUTH_ANSW"); break;
147 case MIFARE_ULEV1_AUTH:
148 if ( cmdsize == 7 )
149 snprintf(exp,size,"PWD-AUTH KEY: 0x%02x%02x%02x%02x", cmd[1], cmd[2], cmd[3], cmd[4] );
150 else
151 snprintf(exp,size,"PWD-AUTH");
152 break;
153 case MIFARE_ULEV1_FASTREAD:{
154 if ( cmdsize >=3 && cmd[2] <= 0xE6)
155 snprintf(exp,size,"READ RANGE (%d-%d)",cmd[1],cmd[2]);
156 else
157 snprintf(exp,size,"?");
158 break;
159 }
160 case MIFARE_ULC_WRITE:{
161 if ( cmd[1] < 0x21 )
162 snprintf(exp,size,"WRITEBLOCK(%d)",cmd[1]);
163 else
164 snprintf(exp,size,"?");
165 break;
166 }
167 case MIFARE_ULEV1_READ_CNT:{
168 if ( cmd[1] < 5 )
169 snprintf(exp,size,"READ CNT(%d)",cmd[1]);
170 else
171 snprintf(exp,size,"?");
172 break;
173 }
174 case MIFARE_ULEV1_INCR_CNT:{
175 if ( cmd[1] < 5 )
176 snprintf(exp,size,"INCR(%d)",cmd[1]);
177 else
178 snprintf(exp,size,"?");
179 break;
180 }
181 case MIFARE_ULEV1_READSIG: snprintf(exp,size,"READ_SIG"); break;
182 case MIFARE_ULEV1_CHECKTEAR: snprintf(exp,size,"CHK_TEARING(%d)",cmd[1]); break;
183 case MIFARE_ULEV1_VCSL: snprintf(exp,size,"VCSL"); break;
184 default: snprintf(exp,size,"?"); break;
185 }
186 return;
187 }
188
189 void annotateMifare(char *exp, size_t size, uint8_t* cmd, uint8_t cmdsize, uint8_t* parity, uint8_t paritysize, bool isResponse) {
190 if (!isResponse && cmdsize == 1) {
191 switch(cmd[0]) {
192 case ISO14443A_CMD_WUPA:
193 case ISO14443A_CMD_REQA:
194 MifareAuthState = masNone;
195 break;
196 default:
197 break;
198 }
199 }
200
201 // get UID
202 if (MifareAuthState == masNone) {
203 if (cmdsize == 9 && cmd[0] == ISO14443A_CMD_ANTICOLL_OR_SELECT && cmd[1] == 0x70) {
204 ClearAuthData();
205 AuthData.uid = bytes_to_num(&cmd[2], 4);
206 }
207 if (cmdsize == 9 && cmd[0] == ISO14443A_CMD_ANTICOLL_OR_SELECT_2 && cmd[1] == 0x70) {
208 ClearAuthData();
209 AuthData.uid = bytes_to_num(&cmd[2], 4);
210 }
211 }
212
213 switch(MifareAuthState) {
214 case masNt:
215 if (cmdsize == 4 && isResponse) {
216 snprintf(exp,size,"AUTH: nt %s", (AuthData.first_auth) ? "" : "(enc)");
217 MifareAuthState = masNrAr;
218 if (AuthData.first_auth)
219 AuthData.nt = bytes_to_num(cmd, 4);
220 else
221 AuthData.nt_enc = bytes_to_num(cmd, 4);
222 AuthData.nt_enc_par = parity[0];
223 return;
224 } else {
225 MifareAuthState = masError;
226 }
227 break;
228 case masNrAr:
229 if (cmdsize == 8 && !isResponse) {
230 snprintf(exp,size,"AUTH: nr ar (enc)");
231 MifareAuthState = masAt;
232 AuthData.nr_enc = bytes_to_num(cmd, 4);
233 AuthData.ar_enc = bytes_to_num(&cmd[4], 4);
234 AuthData.ar_enc_par = parity[0] << 4;
235 return;
236 } else {
237 MifareAuthState = masError;
238 }
239 break;
240 case masAt:
241 if (cmdsize == 4 && isResponse) {
242 snprintf(exp,size,"AUTH: at (enc)");
243 MifareAuthState = masAuthComplete;
244 AuthData.at_enc = bytes_to_num(cmd, 4);
245 AuthData.at_enc_par = parity[0];
246 return;
247 } else {
248 MifareAuthState = masError;
249 }
250 break;
251 default:
252 break;
253 }
254
255 if (!isResponse && ((MifareAuthState == masNone) || (MifareAuthState == masError)))
256 annotateIso14443a(exp, size, cmd, cmdsize);
257
258 }
259
260 bool DecodeMifareData(uint8_t *cmd, uint8_t cmdsize, uint8_t *parity, bool isResponse, uint8_t *mfData, size_t *mfDataLen) {
261 static struct Crypto1State *traceCrypto1;
262 static uint64_t mfLastKey;
263
264 *mfDataLen = 0;
265
266 if (MifareAuthState == masAuthComplete) {
267 if (traceCrypto1) {
268 crypto1_destroy(traceCrypto1);
269 }
270
271 MifareAuthState = masFirstData;
272 return false;
273 }
274
275 if (cmdsize > 32)
276 return false;
277
278 if (MifareAuthState == masFirstData) {
279 if (AuthData.first_auth) {
280 AuthData.ks2 = AuthData.ar_enc ^ prng_successor(AuthData.nt, 64);
281 AuthData.ks3 = AuthData.at_enc ^ prng_successor(AuthData.nt, 96);
282 struct Crypto1State *revstate = lfsr_recovery64(AuthData.ks2, AuthData.ks3);
283 lfsr_rollback_word(revstate, 0, 0);
284 lfsr_rollback_word(revstate, 0, 0);
285 lfsr_rollback_word(revstate, AuthData.nr_enc, 1);
286 lfsr_rollback_word(revstate, AuthData.uid ^ AuthData.nt, 0);
287
288 uint64_t lfsr = 0;
289 crypto1_get_lfsr(revstate, &lfsr);
290 crypto1_destroy(revstate);
291 mfLastKey = lfsr;
292 PrintAndLog(" | * | key | probable key:%x%x Prng:%s ks2:%08x ks3:%08x | |",
293 (unsigned int)((lfsr & 0xFFFFFFFF00000000) >> 32),
294 (unsigned int)(lfsr & 0xFFFFFFFF),
295 validate_prng_nonce(AuthData.nt) ? "WEAK": "HARD",
296 AuthData.ks2,
297 AuthData.ks3);
298
299 AuthData.first_auth = false;
300
301 traceCrypto1 = lfsr_recovery64(AuthData.ks2, AuthData.ks3);
302 } else {
303 // check last used key
304 if (mfLastKey) {
305 if (NestedCheckKey(mfLastKey, &AuthData, cmd, cmdsize, parity)) {
306 PrintAndLog(" | * | key | last used key:%x%x ks2:%08x ks3:%08x | |",
307 (unsigned int)((mfLastKey & 0xFFFFFFFF00000000) >> 32),
308 (unsigned int)(mfLastKey & 0xFFFFFFFF),
309 AuthData.ks2,
310 AuthData.ks3);
311
312 traceCrypto1 = lfsr_recovery64(AuthData.ks2, AuthData.ks3);
313 };
314 }
315
316 // check default keys
317 if (!traceCrypto1) {
318 for (int defaultKeyCounter = 0; defaultKeyCounter < MifareDefaultKeysSize; defaultKeyCounter++){
319 if (NestedCheckKey(MifareDefaultKeys[defaultKeyCounter], &AuthData, cmd, cmdsize, parity)) {
320 PrintAndLog(" | * | key | default key:%x%x ks2:%08x ks3:%08x | |",
321 (unsigned int)((MifareDefaultKeys[defaultKeyCounter] & 0xFFFFFFFF00000000) >> 32),
322 (unsigned int)(MifareDefaultKeys[defaultKeyCounter] & 0xFFFFFFFF),
323 AuthData.ks2,
324 AuthData.ks3);
325
326 traceCrypto1 = lfsr_recovery64(AuthData.ks2, AuthData.ks3);
327 break;
328 };
329 }
330 }
331
332 // nested
333 if (!traceCrypto1 && validate_prng_nonce(AuthData.nt)) {
334 printf("nested. uid:%x nt:%x ar_enc:%x at_enc:%x\n", AuthData.uid, AuthData.nt, AuthData.ar_enc, AuthData.at_enc);
335 uint32_t ntx = prng_successor(AuthData.nt, 90);
336 for (int i = 0; i < 16383; i++) {
337 ntx = prng_successor(ntx, 1);
338 if (NTParityChk(&AuthData, ntx)){
339
340 uint32_t ks2 = AuthData.ar_enc ^ prng_successor(ntx, 64);
341 uint32_t ks3 = AuthData.at_enc ^ prng_successor(ntx, 96);
342 struct Crypto1State *pcs = lfsr_recovery64(ks2, ks3);
343 memcpy(mfData, cmd, cmdsize);
344 mf_crypto1_decrypt(pcs, mfData, cmdsize, 0);
345
346 crypto1_destroy(pcs);
347 if (CheckCrc14443(CRC_14443_A, mfData, cmdsize)) {
348 AuthData.ks2 = ks2;
349 AuthData.ks3 = ks3;
350 traceCrypto1 = lfsr_recovery64(AuthData.ks2, AuthData.ks3);
351 break;
352 }
353 }
354 }
355 if (traceCrypto1)
356 printf("key> nt=%08x nonce distance=%d \n", ntx, nonce_distance(AuthData.nt, ntx));
357 else
358 printf("key> don't have any valid nt( \n");
359 }
360
361 //hardnested
362 if (!traceCrypto1) {
363 printf("hardnested not implemented. uid:%x nt:%x ar_enc:%x at_enc:%x\n", AuthData.uid, AuthData.nt, AuthData.ar_enc, AuthData.at_enc);
364 }
365 }
366
367
368
369 MifareAuthState = masData;
370 }
371
372 if (MifareAuthState == masData && traceCrypto1) {
373 memcpy(mfData, cmd, cmdsize);
374 mf_crypto1_decrypt(traceCrypto1, mfData, cmdsize, 0);
375 *mfDataLen = cmdsize;
376 }
377
378 return *mfDataLen > 0;
379 }
380
381 bool NTParityChk(TAuthData *ad, uint32_t ntx) {
382 if (
383 (oddparity8(ntx >> 8 & 0xff) ^ (ntx & 0x01) ^ ((ad->nt_enc_par >> 5) & 0x01) ^ (ad->nt_enc & 0x01)) ||
384 (oddparity8(ntx >> 16 & 0xff) ^ (ntx >> 8 & 0x01) ^ ((ad->nt_enc_par >> 6) & 0x01) ^ (ad->nt_enc >> 8 & 0x01)) ||
385 (oddparity8(ntx >> 24 & 0xff) ^ (ntx >> 16 & 0x01) ^ ((ad->nt_enc_par >> 7) & 0x01) ^ (ad->nt_enc >> 16 & 0x01))
386 )
387 return false;
388
389 uint32_t ar = prng_successor(ntx, 64);
390 if (
391 (oddparity8(ar >> 8 & 0xff) ^ (ar & 0x01) ^ ((ad->ar_enc_par >> 5) & 0x01) ^ (ad->ar_enc & 0x01)) ||
392 (oddparity8(ar >> 16 & 0xff) ^ (ar >> 8 & 0x01) ^ ((ad->ar_enc_par >> 6) & 0x01) ^ (ad->ar_enc >> 8 & 0x01)) ||
393 (oddparity8(ar >> 24 & 0xff) ^ (ar >> 16 & 0x01) ^ ((ad->ar_enc_par >> 7) & 0x01) ^ (ad->ar_enc >> 16 & 0x01))
394 )
395 return false;
396
397 uint32_t at = prng_successor(ntx, 96);
398 if (
399 (oddparity8(ar & 0xff) ^ (at >> 24 & 0x01) ^ ((ad->ar_enc_par >> 4) & 0x01) ^ (ad->at_enc >> 24 & 0x01)) ||
400 (oddparity8(at >> 8 & 0xff) ^ (at & 0x01) ^ ((ad->at_enc_par >> 5) & 0x01) ^ (ad->at_enc & 0x01)) ||
401 (oddparity8(at >> 16 & 0xff) ^ (at >> 8 & 0x01) ^ ((ad->at_enc_par >> 6) & 0x01) ^ (ad->at_enc >> 8 & 0x01)) ||
402 (oddparity8(at >> 24 & 0xff) ^ (at >> 16 & 0x01) ^ ((ad->at_enc_par >> 7) & 0x01) ^ (ad->at_enc >> 16 & 0x01))
403 )
404 return false;
405
406 return true;
407 }
408
409 bool NestedCheckKey(uint64_t key, TAuthData *ad, uint8_t *cmd, uint8_t cmdsize, uint8_t *parity) {
410 uint8_t buf[32] = {0};
411 struct Crypto1State *pcs;
412
413 AuthData.ks2 = 0;
414 AuthData.ks3 = 0;
415
416 pcs = crypto1_create(key);
417 uint32_t nt1 = crypto1_word(pcs, ad->nt_enc ^ ad->uid, 1) ^ ad->nt_enc;
418 uint32_t ar = prng_successor(nt1, 64);
419 uint32_t at = prng_successor(nt1, 96);
420
421 crypto1_word(pcs, ad->nr_enc, 1);
422 // uint32_t nr1 = crypto1_word(pcs, ad->nr_enc, 1) ^ ad->nr_enc; // if needs deciphered nr
423 uint32_t ar1 = crypto1_word(pcs, 0, 0) ^ ad->ar_enc;
424 uint32_t at1 = crypto1_word(pcs, 0, 0) ^ ad->at_enc;
425
426 if (!(ar == ar1 && at == at1 && NTParityChk(ad, nt1)))
427 return false;
428
429 memcpy(buf, cmd, cmdsize);
430 mf_crypto1_decrypt(pcs, buf, cmdsize, 0);
431
432 crypto1_destroy(pcs);
433
434 if (!CheckCrypto1Parity(cmd, cmdsize, buf, parity))
435 return false;
436
437 if(!CheckCrc14443(CRC_14443_A, buf, cmdsize))
438 return false;
439
440 AuthData.ks2 = AuthData.ar_enc ^ ar;
441 AuthData.ks3 = AuthData.at_enc ^ at;
442
443 return true;
444 }
445
446 bool CheckCrypto1Parity(uint8_t *cmd_enc, uint8_t cmdsize, uint8_t *cmd, uint8_t *parity_enc) {
447 uint8_t parity[16];
448 oddparitybuf(cmd, cmdsize, parity);
449 printf("parity check. size=%d\n", cmdsize);
450 printf("cmd =%s\n", sprint_hex(cmd, cmdsize));
451 printf("cmd_enc=%s\n", sprint_hex(cmd_enc, cmdsize));
452 printf("parity =%s\n", printBitsPar(parity, cmdsize));
453 printf("parity_enc=%s\n", printBitsPar(parity_enc, cmdsize));
454 // (oddparity8(ntx >> 8 & 0xff) ^ (ntx & 0x01) ^ ((ad->nt_enc_par >> 5) & 0x01) ^ (ad->nt_enc & 0x01)) ||
455 // (oddparity8(ntx >> 24 & 0xff) ^ (ntx >> 16 & 0x01) ^ ((ad->nt_enc_par >> 7) & 0x01) ^ (ad->nt_enc >> 16 & 0x01))
456 for (int i = 0; i < cmdsize - 1; i++) {
457 bool b = oddparity8(cmd[i]) ^ (cmd[i + 1] & 0x01) ^ ((parity_enc[i / 8] >> (7 - i % 8)) & 0x01) ^ (cmd_enc[i + 1] & 0x01);
458 if (b)
459 printf("!!! i=%d \n", i);
460 }
461
462 return true;
463 }
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