cvs.zerfleddert.de Git - proxmark3-svn/blob

1 //-----------------------------------------------------------------------------

2 // Gerhard de Koning Gans - May 2008

3 // Hagen Fritsch - June 2010

4 // Gerhard de Koning Gans - May 2011

5 // Gerhard de Koning Gans - June 2012 - Added iClass card and reader emulation

6 // piwi - 2019

7 //

8 // This code is licensed to you under the terms of the GNU GPL, version 2 or,

9 // at your option, any later version. See the LICENSE.txt file for the text of

10 // the license.

11 //-----------------------------------------------------------------------------

12 // Routines to support iClass.

13 //-----------------------------------------------------------------------------

14 // Contribution made during a security research at Radboud University Nijmegen

15 //

16 // Please feel free to contribute and extend iClass support!!

17 //-----------------------------------------------------------------------------

19 #include "iclass.h"

21 #include "proxmark3.h"

22 #include "apps.h"

23 #include "util.h"

24 #include "string.h"

25 #include "printf.h"

26 #include "common.h"

27 #include "usb_cdc.h"

28 #include "iso14443a.h"

29 #include "iso15693.h"

30 // Needed for CRC in emulation mode;

31 // same construction as in ISO 14443;

32 // different initial value (CRC_ICLASS)

33 #include "iso14443crc.h"

34 #include "iso15693tools.h"

35 #include "protocols.h"

36 #include "optimized_cipher.h"

37 #include "fpgaloader.h"

39 // iCLASS has a slightly different timing compared to ISO15693. According to the picopass data sheet the tag response is expected 330us after

40 // the reader command. This is measured from end of reader EOF to first modulation of the tag's SOF which starts with a 56,64us unmodulated period.

41 // 330us = 140 ssp_clk cycles @ 423,75kHz when simulating.

42 // 56,64us = 24 ssp_clk_cycles

43 #define DELAY_ICLASS_VCD_TO_VICC_SIM (140 - 24)

44 // times in ssp_clk_cycles @ 3,3625MHz when acting as reader

45 #define DELAY_ICLASS_VICC_TO_VCD_READER DELAY_ISO15693_VICC_TO_VCD_READER

46 // times in samples @ 212kHz when acting as reader

47 #define ICLASS_READER_TIMEOUT_ACTALL 330 // 1558us, nominal 330us + 7slots*160us = 1450us

48 #define ICLASS_READER_TIMEOUT_UPDATE 3390 // 16000us, nominal 4-15ms

49 #define ICLASS_READER_TIMEOUT_OTHERS 80 // 380us, nominal 330us

51 #define ICLASS_BUFFER_SIZE 34 // we expect max 34 bytes as tag answer (response to READ4)

54 //=============================================================================

55 // A `sniffer' for iClass communication

56 // Both sides of communication!

57 //=============================================================================

 void SnoopIClass(uint8_t jam_search_len, uint8_t *jam_search_string) {

59 SnoopIso15693(jam_search_len, jam_search_string);

60 }

 void rotateCSN(uint8_t* originalCSN, uint8_t* rotatedCSN) {

64 int i;

         for (i = 0; i < 8; i++) {

                 rotatedCSN[i] = (originalCSN[i] >> 3) | (originalCSN[(i+1)%8] << 5);

67 }

68 }

71 // Encode SOF only

72 static void CodeIClassTagSOF() {

73 ToSendReset();

74 ToSend[++ToSendMax] = 0x1D;

75 ToSendMax++;

76 }

 static void AppendCrc(uint8_t *data, int len) {

         ComputeCrc14443(CRC_ICLASS, data, len, data+len, data+len+1);

81 }

84 /**

85 * @brief Does the actual simulation

86 */

 int doIClassSimulation(int simulationMode, uint8_t *reader_mac_buf) {

89 // free eventually allocated BigBuf memory

90 BigBuf_free_keep_EM();

         uint16_t page_size = 32 * 8;

93 uint8_t current_page = 0;

95 // maintain cipher states for both credit and debit key for each page

96 State cipher_state_KC[8];

97 State cipher_state_KD[8];

         State *cipher_state = &cipher_state_KD[0];

         uint8_t *emulator = BigBuf_get_EM_addr();

101 uint8_t *csn = emulator;

102

103 // CSN followed by two CRC bytes

104 uint8_t anticoll_data[10];

105 uint8_t csn_data[10];

         memcpy(csn_data, csn, sizeof(csn_data));

         Dbprintf("Simulating CSN %02x%02x%02x%02x%02x%02x%02x%02x", csn[0], csn[1], csn[2], csn[3], csn[4], csn[5], csn[6], csn[7]);

108

109 // Construct anticollision-CSN

110 rotateCSN(csn_data, anticoll_data);

111

112 // Compute CRC on both CSNs

         AppendCrc(anticoll_data, 8);

         AppendCrc(csn_data, 8);

115

         uint8_t diversified_key_d[8] = { 0x00 };

         uint8_t diversified_key_c[8] = { 0x00 };

118 uint8_t *diversified_key = diversified_key_d;

119

120 // configuration block

         uint8_t conf_block[10] = {0x12, 0xFF, 0xFF, 0xFF, 0x7F, 0x1F, 0xFF, 0x3C, 0x00, 0x00};

122

123 // e-Purse

         uint8_t card_challenge_data[8] = { 0xfe, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };

125

126 if (simulationMode == ICLASS_SIM_MODE_FULL) {

127 // initialize from page 0

                 memcpy(conf_block, emulator + 8 * 1, 8);

                 memcpy(card_challenge_data, emulator + 8 * 2, 8); // e-purse

                 memcpy(diversified_key_d, emulator + 8 * 3, 8);   // Kd

                 memcpy(diversified_key_c, emulator + 8 * 4, 8);   // Kc

132 }

133

         AppendCrc(conf_block, 8);

135

136 // save card challenge for sim2,4 attack

137 if (reader_mac_buf != NULL) {

                 memcpy(reader_mac_buf, card_challenge_data, 8);

139 }

140

         if (conf_block[5] & 0x80) {

                 page_size = 256 * 8;

143 }

144

145 // From PicoPass DS:

146 // When the page is in personalization mode this bit is equal to 1.

147 // Once the application issuer has personalized and coded its dedicated areas, this bit must be set to 0:

148 // the page is then "in application mode".

         bool personalization_mode = conf_block[7] & 0x80;

150

151 // chip memory may be divided in 8 pages

         uint8_t max_page = conf_block[4] & 0x10 ? 0 : 7;

153

154 // Precalculate the cipher states, feeding it the CC

         cipher_state_KD[0] = opt_doTagMAC_1(card_challenge_data, diversified_key_d);

         cipher_state_KC[0] = opt_doTagMAC_1(card_challenge_data, diversified_key_c);

157 if (simulationMode == ICLASS_SIM_MODE_FULL) {

                 for (int i = 1; i < max_page; i++) {

                         uint8_t *epurse = emulator + i*page_size + 8*2;

                         uint8_t *Kd = emulator + i*page_size + 8*3;

                         uint8_t *Kc = emulator + i*page_size + 8*4;

                         cipher_state_KD[i] = opt_doTagMAC_1(epurse, Kd);

                         cipher_state_KC[i] = opt_doTagMAC_1(epurse, Kc);

164 }

165 }

166

167 int exitLoop = 0;

168 // Reader 0a

169 // Tag 0f

170 // Reader 0c

171 // Tag anticoll. CSN

172 // Reader 81 anticoll. CSN

173 // Tag CSN

174

175 uint8_t *modulated_response;

176 int modulated_response_size = 0;

177 uint8_t *trace_data = NULL;

178 int trace_data_size = 0;

179

180 // Respond SOF -- takes 1 bytes

         uint8_t *resp_sof = BigBuf_malloc(1);

182 int resp_sof_Len;

183

184 // Anticollision CSN (rotated CSN)

185 // 22: Takes 2 bytes for SOF/EOF and 10 * 2 = 20 bytes (2 bytes/byte)

         uint8_t *resp_anticoll = BigBuf_malloc(22);

187 int resp_anticoll_len;

188

189 // CSN (block 0)

190 // 22: Takes 2 bytes for SOF/EOF and 10 * 2 = 20 bytes (2 bytes/byte)

         uint8_t *resp_csn = BigBuf_malloc(22);

192 int resp_csn_len;

193

194 // configuration (block 1) picopass 2ks

         uint8_t *resp_conf = BigBuf_malloc(22);

196 int resp_conf_len;

197

198 // e-Purse (block 2)

199 // 18: Takes 2 bytes for SOF/EOF and 8 * 2 = 16 bytes (2 bytes/bit)

         uint8_t *resp_cc = BigBuf_malloc(18);

201 int resp_cc_len;

202

203 // Kd, Kc (blocks 3 and 4). Cannot be read. Always respond with 0xff bytes only

         uint8_t *resp_ff = BigBuf_malloc(22);

205 int resp_ff_len;

         uint8_t ff_data[10] = {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x00, 0x00};

         AppendCrc(ff_data, 8);

208

209 // Application Issuer Area (block 5)

         uint8_t *resp_aia = BigBuf_malloc(22);

211 int resp_aia_len;

         uint8_t aia_data[10] = {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x00, 0x00};

         AppendCrc(aia_data, 8);

214

         uint8_t *receivedCmd = BigBuf_malloc(MAX_FRAME_SIZE);

216 int len;

217

218 // Prepare card messages

219

220 // First card answer: SOF only

221 CodeIClassTagSOF();

         memcpy(resp_sof, ToSend, ToSendMax);

223 resp_sof_Len = ToSendMax;

224

225 // Anticollision CSN

         CodeIso15693AsTag(anticoll_data, sizeof(anticoll_data));

         memcpy(resp_anticoll, ToSend, ToSendMax);

228 resp_anticoll_len = ToSendMax;

229

230 // CSN (block 0)

         CodeIso15693AsTag(csn_data, sizeof(csn_data));

         memcpy(resp_csn, ToSend, ToSendMax);

233 resp_csn_len = ToSendMax;

234

235 // Configuration (block 1)

         CodeIso15693AsTag(conf_block, sizeof(conf_block));

         memcpy(resp_conf, ToSend, ToSendMax);

238 resp_conf_len = ToSendMax;

239

240 // e-Purse (block 2)

         CodeIso15693AsTag(card_challenge_data, sizeof(card_challenge_data));

         memcpy(resp_cc, ToSend, ToSendMax);

243 resp_cc_len = ToSendMax;

244

245 // Kd, Kc (blocks 3 and 4)

         CodeIso15693AsTag(ff_data, sizeof(ff_data));

         memcpy(resp_ff, ToSend, ToSendMax);

248 resp_ff_len = ToSendMax;

249

250 // Application Issuer Area (block 5)

         CodeIso15693AsTag(aia_data, sizeof(aia_data));

         memcpy(resp_aia, ToSend, ToSendMax);

253 resp_aia_len = ToSendMax;

254

255 //This is used for responding to READ-block commands or other data which is dynamically generated

         uint8_t *data_generic_trace = BigBuf_malloc(32 + 2); // 32 bytes data + 2byte CRC is max tag answer

         uint8_t *data_response = BigBuf_malloc( (32 + 2) * 2 + 2);

258

259 bool buttonPressed = false;

         enum { IDLE, ACTIVATED, SELECTED, HALTED } chip_state = IDLE;

261

262 while (!exitLoop) {

263 WDT_HIT();

264

265 uint32_t reader_eof_time = 0;

                 len = GetIso15693CommandFromReader(receivedCmd, MAX_FRAME_SIZE, &reader_eof_time);

                 if (len < 0) {

268 buttonPressed = true;

269 break;

270 }

271

272 // Now look at the reader command and provide appropriate responses

273 // default is no response:

274 modulated_response = NULL;

275 modulated_response_size = 0;

276 trace_data = NULL;

277 trace_data_size = 0;

278

                 if (receivedCmd[0] == ICLASS_CMD_ACTALL && len == 1) {

280 // Reader in anticollision phase

281 if (chip_state != HALTED) {

282 modulated_response = resp_sof;

283 modulated_response_size = resp_sof_Len;

284 chip_state = ACTIVATED;

285 }

286

                 } else if (receivedCmd[0] == ICLASS_CMD_READ_OR_IDENTIFY && len == 1) { // identify

288 // Reader asks for anticollision CSN

                         if (chip_state == SELECTED || chip_state == ACTIVATED) {

290 modulated_response = resp_anticoll;

291 modulated_response_size = resp_anticoll_len;

292 trace_data = anticoll_data;

293 trace_data_size = sizeof(anticoll_data);

294 }

295

                 } else if (receivedCmd[0] == ICLASS_CMD_SELECT && len == 9) {

297 // Reader selects anticollision CSN.

298 // Tag sends the corresponding real CSN

                         if (chip_state == ACTIVATED || chip_state == SELECTED) {

                                 if (!memcmp(receivedCmd+1, anticoll_data, 8)) {

301 modulated_response = resp_csn;

302 modulated_response_size = resp_csn_len;

303 trace_data = csn_data;

304 trace_data_size = sizeof(csn_data);

305 chip_state = SELECTED;

306 } else {

307 chip_state = IDLE;

308 }

                         } else if (chip_state == HALTED) {

310 // RESELECT with CSN

                                 if (!memcmp(receivedCmd+1, csn_data, 8)) {

312 modulated_response = resp_csn;

313 modulated_response_size = resp_csn_len;

314 trace_data = csn_data;

315 trace_data_size = sizeof(csn_data);

316 chip_state = SELECTED;

317 }

318 }

319

                 } else if (receivedCmd[0] == ICLASS_CMD_READ_OR_IDENTIFY && len == 4) { // read block

                         uint16_t blockNo = receivedCmd[1];

322 if (chip_state == SELECTED) {

323 if (simulationMode == ICLASS_SIM_MODE_EXIT_AFTER_MAC) {

324 // provide defaults for blocks 0 ... 5

325 switch (blockNo) {

326 case 0: // csn (block 00)

327 modulated_response = resp_csn;

328 modulated_response_size = resp_csn_len;

329 trace_data = csn_data;

330 trace_data_size = sizeof(csn_data);

331 break;

332 case 1: // configuration (block 01)

333 modulated_response = resp_conf;

334 modulated_response_size = resp_conf_len;

335 trace_data = conf_block;

336 trace_data_size = sizeof(conf_block);

337 break;

338 case 2: // e-purse (block 02)

339 modulated_response = resp_cc;

340 modulated_response_size = resp_cc_len;

341 trace_data = card_challenge_data;

342 trace_data_size = sizeof(card_challenge_data);

343 // set epurse of sim2,4 attack

344 if (reader_mac_buf != NULL) {

                                                                 memcpy(reader_mac_buf, card_challenge_data, 8);

346 }

347 break;

348 case 3:

349 case 4: // Kd, Kc, always respond with 0xff bytes

350 modulated_response = resp_ff;

351 modulated_response_size = resp_ff_len;

352 trace_data = ff_data;

353 trace_data_size = sizeof(ff_data);

354 break;

355 case 5: // Application Issuer Area (block 05)

356 modulated_response = resp_aia;

357 modulated_response_size = resp_aia_len;

358 trace_data = aia_data;

359 trace_data_size = sizeof(aia_data);

360 break;

361 // default: don't respond

362 }

                                 } else if (simulationMode == ICLASS_SIM_MODE_FULL) {

                                         if (blockNo == 3 || blockNo == 4) { // Kd, Kc, always respond with 0xff bytes

365 modulated_response = resp_ff;

366 modulated_response_size = resp_ff_len;

367 trace_data = ff_data;

368 trace_data_size = sizeof(ff_data);

369 } else { // use data from emulator memory

                                                 memcpy(data_generic_trace, emulator + current_page*page_size + 8*blockNo, 8);

                                                 AppendCrc(data_generic_trace, 8);

372 trace_data = data_generic_trace;

373 trace_data_size = 10;

374 CodeIso15693AsTag(trace_data, trace_data_size);

                                                 memcpy(data_response, ToSend, ToSendMax);

376 modulated_response = data_response;

377 modulated_response_size = ToSendMax;

378 }

379 }

380 }

381

                 } else if ((receivedCmd[0] == ICLASS_CMD_READCHECK_KD

                                         || receivedCmd[0] == ICLASS_CMD_READCHECK_KC) && receivedCmd[1] == 0x02 && len == 2) {

384 // Read e-purse (88 02 || 18 02)

385 if (chip_state == SELECTED) {

                                 if(receivedCmd[0] == ICLASS_CMD_READCHECK_KD){

387 cipher_state = &cipher_state_KD[current_page];

388 diversified_key = diversified_key_d;

389 } else {

390 cipher_state = &cipher_state_KC[current_page];

391 diversified_key = diversified_key_c;

392 }

393 modulated_response = resp_cc;

394 modulated_response_size = resp_cc_len;

395 trace_data = card_challenge_data;

396 trace_data_size = sizeof(card_challenge_data);

397 }

398

                 } else if ((receivedCmd[0] == ICLASS_CMD_CHECK_KC

                                         || receivedCmd[0] == ICLASS_CMD_CHECK_KD) && len == 9) {

401 // Reader random and reader MAC!!!

402 if (chip_state == SELECTED) {

403 if (simulationMode == ICLASS_SIM_MODE_FULL) {

404 //NR, from reader, is in receivedCmd+1

                                         opt_doTagMAC_2(*cipher_state, receivedCmd+1, data_generic_trace, diversified_key);

406 trace_data = data_generic_trace;

407 trace_data_size = 4;

408 CodeIso15693AsTag(trace_data, trace_data_size);

                                         memcpy(data_response, ToSend, ToSendMax);

410 modulated_response = data_response;

411 modulated_response_size = ToSendMax;

412 //exitLoop = true;

413 } else { // Not fullsim, we don't respond

414 // We do not know what to answer, so lets keep quiet

415 if (simulationMode == ICLASS_SIM_MODE_EXIT_AFTER_MAC) {

416 if (reader_mac_buf != NULL) {

417 // save NR and MAC for sim 2,4

                                                         memcpy(reader_mac_buf + 8, receivedCmd + 1, 8);

419 }

420 exitLoop = true;

421 }

422 }

423 }

424

                 } else if (receivedCmd[0] == ICLASS_CMD_HALT && len == 1) {

426 if (chip_state == SELECTED) {

427 // Reader ends the session

428 modulated_response = resp_sof;

429 modulated_response_size = resp_sof_Len;

430 chip_state = HALTED;

431 }

432

                 } else if (simulationMode == ICLASS_SIM_MODE_FULL && receivedCmd[0] == ICLASS_CMD_READ4 && len == 4) {  // 0x06

434 //Read 4 blocks

435 if (chip_state == SELECTED) {

                                 uint8_t blockNo = receivedCmd[1];

                                 memcpy(data_generic_trace, emulator + current_page*page_size + blockNo*8, 8 * 4);

                                 AppendCrc(data_generic_trace, 8 * 4);

439 trace_data = data_generic_trace;

                                 trace_data_size = 8 * 4 + 2;

441 CodeIso15693AsTag(trace_data, trace_data_size);

                                 memcpy(data_response, ToSend, ToSendMax);

443 modulated_response = data_response;

444 modulated_response_size = ToSendMax;

445 }

446

                 } else if (receivedCmd[0] == ICLASS_CMD_UPDATE && (len == 12 || len == 14)) {

448 // We're expected to respond with the data+crc, exactly what's already in the receivedCmd

449 // receivedCmd is now UPDATE 1b | ADDRESS 1b | DATA 8b | Signature 4b or CRC 2b

450 if (chip_state == SELECTED) {

                                 uint8_t blockNo = receivedCmd[1];

                                 if (blockNo == 2) { // update e-purse

                                         memcpy(card_challenge_data, receivedCmd+2, 8);

                                         CodeIso15693AsTag(card_challenge_data, sizeof(card_challenge_data));

                                         memcpy(resp_cc, ToSend, ToSendMax);

456 resp_cc_len = ToSendMax;

                                         cipher_state_KD[current_page] = opt_doTagMAC_1(card_challenge_data, diversified_key_d);

                                         cipher_state_KC[current_page] = opt_doTagMAC_1(card_challenge_data, diversified_key_c);

459 if (simulationMode == ICLASS_SIM_MODE_FULL) {

                                                 memcpy(emulator + current_page*page_size + 8*2, card_challenge_data, 8);

461 }

                                 } else if (blockNo == 3) { // update Kd

                                         for (int i = 0; i < 8; i++) {

464 if (personalization_mode) {

                                                         diversified_key_d[i] = receivedCmd[2 + i];

466 } else {

                                                         diversified_key_d[i] ^= receivedCmd[2 + i];

468 }

469 }

                                         cipher_state_KD[current_page] = opt_doTagMAC_1(card_challenge_data, diversified_key_d);

471 if (simulationMode == ICLASS_SIM_MODE_FULL) {

                                                 memcpy(emulator + current_page*page_size + 8*3, diversified_key_d, 8);

473 }

                                 } else if (blockNo == 4) { // update Kc

                                         for (int i = 0; i < 8; i++) {

476 if (personalization_mode) {

                                                         diversified_key_c[i] = receivedCmd[2 + i];

478 } else {

                                                         diversified_key_c[i] ^= receivedCmd[2 + i];

480 }

481 }

                                         cipher_state_KC[current_page] = opt_doTagMAC_1(card_challenge_data, diversified_key_c);

483 if (simulationMode == ICLASS_SIM_MODE_FULL) {

                                                 memcpy(emulator + current_page*page_size + 8*4, diversified_key_c, 8);

485 }

                                 } else if (simulationMode == ICLASS_SIM_MODE_FULL) { // update any other data block

                                                 memcpy(emulator + current_page*page_size + 8*blockNo, receivedCmd+2, 8);

488 }

                                 memcpy(data_generic_trace, receivedCmd + 2, 8);

                                 AppendCrc(data_generic_trace, 8);

491 trace_data = data_generic_trace;

492 trace_data_size = 10;

493 CodeIso15693AsTag(trace_data, trace_data_size);

                                 memcpy(data_response, ToSend, ToSendMax);

495 modulated_response = data_response;

496 modulated_response_size = ToSendMax;

497 }

498

                 } else if (receivedCmd[0] == ICLASS_CMD_PAGESEL && len == 4) {

500 // Pagesel

501 // Chips with a single page will not answer to this command

502 // Otherwise, we should answer 8bytes (conf block 1) + 2bytes CRC

503 if (chip_state == SELECTED) {

                                 if (simulationMode == ICLASS_SIM_MODE_FULL && max_page > 0) {

505 current_page = receivedCmd[1];

                                         memcpy(data_generic_trace, emulator + current_page*page_size + 8*1, 8);

                                         memcpy(diversified_key_d, emulator + current_page*page_size + 8*3, 8);

                                         memcpy(diversified_key_c, emulator + current_page*page_size + 8*4, 8);

509 cipher_state = &cipher_state_KD[current_page];

                                         personalization_mode = data_generic_trace[7] & 0x80;

                                         AppendCrc(data_generic_trace, 8);

512 trace_data = data_generic_trace;

513 trace_data_size = 10;

514 CodeIso15693AsTag(trace_data, trace_data_size);

                                         memcpy(data_response, ToSend, ToSendMax);

516 modulated_response = data_response;

517 modulated_response_size = ToSendMax;

518 }

519 }

520

                 } else if (receivedCmd[0] == 0x26 && len == 5) {

522 // standard ISO15693 INVENTORY command. Ignore.

523

524 } else {

525 // don't know how to handle this command

                         char debug_message[250]; // should be enough

                         sprintf(debug_message, "Unhandled command (len = %d) received from reader:", len);

                         for (int i = 0; i < len && strlen(debug_message) < sizeof(debug_message) - 3 - 1; i++) {

                                 sprintf(debug_message + strlen(debug_message), " %02x", receivedCmd[i]);

530 }

                         Dbprintf("%s", debug_message);

532 // Do not respond

533 }

534

535 /**

536 A legit tag has about 273,4us delay between reader EOT and tag SOF.

537 **/

                 if (modulated_response_size > 0) {

539 uint32_t response_time = reader_eof_time + DELAY_ICLASS_VCD_TO_VICC_SIM;

                         TransmitTo15693Reader(modulated_response, modulated_response_size, &response_time, 0, false);

                         LogTrace_ISO15693(trace_data, trace_data_size, response_time*32, response_time*32 + modulated_response_size*32*64, NULL, false);

542 }

543

544 }

545

546 if (buttonPressed)

547 {

548 DbpString("Button pressed");

549 }

550 return buttonPressed;

551 }

552

553 /**

554 * @brief SimulateIClass simulates an iClass card.

555 * @param arg0 type of simulation

556 * - 0 uses the first 8 bytes in usb data as CSN

557 * - 2 "dismantling iclass"-attack. This mode iterates through all CSN's specified

558 * in the usb data. This mode collects MAC from the reader, in order to do an offline

559 * attack on the keys. For more info, see "dismantling iclass" and proxclone.com.

560 * - Other : Uses the default CSN (031fec8af7ff12e0)

561 * @param arg1 - number of CSN's contained in datain (applicable for mode 2 only)

562 * @param arg2

563 * @param datain

564 */

 void SimulateIClass(uint32_t arg0, uint32_t arg1, uint32_t arg2, uint8_t *datain) {

566

567 LED_A_ON();

568

569 Iso15693InitTag();

570

571 uint32_t simType = arg0;

572 uint32_t numberOfCSNS = arg1;

573

574 // Enable and clear the trace

575 set_tracing(true);

576 clear_trace();

577 //Use the emulator memory for SIM

         uint8_t *emulator = BigBuf_get_EM_addr();

579

580 if (simType == ICLASS_SIM_MODE_CSN) {

581 // Use the CSN from commandline

                 memcpy(emulator, datain, 8);

583 doIClassSimulation(ICLASS_SIM_MODE_CSN, NULL);

         } else if (simType == ICLASS_SIM_MODE_CSN_DEFAULT) {

585 //Default CSN

                 uint8_t csn[] = {0x03, 0x1f, 0xec, 0x8a, 0xf7, 0xff, 0x12, 0xe0};

                 memcpy(emulator, csn, 8);

588 doIClassSimulation(ICLASS_SIM_MODE_CSN, NULL);

         } else if (simType == ICLASS_SIM_MODE_READER_ATTACK) {

                 uint8_t mac_responses[USB_CMD_DATA_SIZE] = { 0 };

                 Dbprintf("Going into attack mode, %d CSNS sent", numberOfCSNS);

592 // In this mode, a number of csns are within datain. We'll simulate each one, one at a time

593 // in order to collect MAC's from the reader. This can later be used in an offline-attack

594 // in order to obtain the keys, as in the "dismantling iclass"-paper.

595 int i;

                 for (i = 0; i < numberOfCSNS && i*16+16 <= USB_CMD_DATA_SIZE; i++) {

597 // The usb data is 512 bytes, fitting 32 responses (8 byte CC + 4 Byte NR + 4 Byte MAC = 16 Byte response).

                         memcpy(emulator, datain+(i*8), 8);

                         if (doIClassSimulation(ICLASS_SIM_MODE_EXIT_AFTER_MAC, mac_responses+i*16)) {

600 // Button pressed

601 break;

602 }

603 Dbprintf("CSN: %02x %02x %02x %02x %02x %02x %02x %02x",

                                         datain[i*8+0], datain[i*8+1], datain[i*8+2], datain[i*8+3],

                                         datain[i*8+4], datain[i*8+5], datain[i*8+6], datain[i*8+7]);

606 Dbprintf("NR,MAC: %02x %02x %02x %02x %02x %02x %02x %02x",

                                         mac_responses[i*16+ 8], mac_responses[i*16+ 9], mac_responses[i*16+10], mac_responses[i*16+11],

                                         mac_responses[i*16+12], mac_responses[i*16+13], mac_responses[i*16+14], mac_responses[i*16+15]);

                         SpinDelay(100); // give the reader some time to prepare for next CSN

610 }

                 cmd_send(CMD_ACK, CMD_SIMULATE_TAG_ICLASS, i, 0, mac_responses, i*16);

         } else if (simType == ICLASS_SIM_MODE_FULL) {

613 //This is 'full sim' mode, where we use the emulator storage for data.

614 doIClassSimulation(ICLASS_SIM_MODE_FULL, NULL);

615 } else {

616 // We may want a mode here where we hardcode the csns to use (from proxclone).

617 // That will speed things up a little, but not required just yet.

618 Dbprintf("The mode is not implemented, reserved for future use");

619 }

620

621 Dbprintf("Done...");

622

623 LED_A_OFF();

624 }

625

626

627 /// THE READER CODE

628

 static void ReaderTransmitIClass(uint8_t *frame, int len, uint32_t *start_time) {

630

631 CodeIso15693AsReader(frame, len);

         TransmitTo15693Tag(ToSend, ToSendMax, start_time);

         uint32_t end_time = *start_time + 32*(8*ToSendMax-4); // substract the 4 padding bits after EOF

         LogTrace_ISO15693(frame, len, *start_time*4, end_time*4, NULL, true);

635 }

636

637

 static bool sendCmdGetResponseWithRetries(uint8_t* command, size_t cmdsize, uint8_t* resp, size_t max_resp_size,

                                                                                   uint8_t expected_size, uint8_t tries, uint32_t start_time, uint32_t timeout, uint32_t *eof_time) {

         while (tries-- > 0) {

                 ReaderTransmitIClass(command, cmdsize, &start_time);

                 if (expected_size == GetIso15693AnswerFromTag(resp, max_resp_size, timeout, eof_time)) {

643 return true;

644 }

645 }

646 return false;//Error

647 }

648

649

650 /**

651 * @brief Selects an iclass tag

652 * @param card_data where the CSN is stored for return

653 * @return false = fail

654 * true = success

655 */

 static bool selectIclassTag(uint8_t *card_data, uint32_t *eof_time) {

657 uint8_t act_all[] = { 0x0a };

658 uint8_t identify[] = { 0x0c };

         uint8_t select[]       = { 0x81, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };

660

661 uint8_t resp[ICLASS_BUFFER_SIZE];

662

663 uint32_t start_time = GetCountSspClk();

664

665 // Send act_all

         ReaderTransmitIClass(act_all, 1, &start_time);

667 // Card present?

         if (GetIso15693AnswerFromTag(resp, sizeof(resp), ICLASS_READER_TIMEOUT_ACTALL, eof_time) < 0) return false; //Fail

669

670 //Send Identify

671 start_time = *eof_time + DELAY_ICLASS_VICC_TO_VCD_READER;

         ReaderTransmitIClass(identify, 1, &start_time);

673 //We expect a 10-byte response here, 8 byte anticollision-CSN and 2 byte CRC

         uint8_t len = GetIso15693AnswerFromTag(resp, sizeof(resp), ICLASS_READER_TIMEOUT_OTHERS, eof_time);

         if (len != 10) return false; //Fail

676

677 //Copy the Anti-collision CSN to our select-packet

         memcpy(&select[1], resp, 8);

679 //Select the card

680 start_time = *eof_time + DELAY_ICLASS_VICC_TO_VCD_READER;

         ReaderTransmitIClass(select, sizeof(select), &start_time);

682 //We expect a 10-byte response here, 8 byte CSN and 2 byte CRC

         len = GetIso15693AnswerFromTag(resp, sizeof(resp), ICLASS_READER_TIMEOUT_OTHERS, eof_time);

         if (len != 10) return false; //Fail

685

686 //Success - we got CSN

687 //Save CSN in response data

         memcpy(card_data, resp, 8);

689

690 return true;

691 }

692

693

694 // Select an iClass tag and read all blocks which are always readable without authentication

 void ReaderIClass(uint8_t flags) {

696

697 LED_A_ON();

698

         uint8_t card_data[6 * 8] = {0};

         memset(card_data, 0xFF, sizeof(card_data));

701 uint8_t resp[ICLASS_BUFFER_SIZE];

702 //Read conf block CRC(0x01) => 0xfa 0x22

         uint8_t readConf[] = {ICLASS_CMD_READ_OR_IDENTIFY, 0x01, 0xfa, 0x22};

704 //Read e-purse block CRC(0x02) => 0x61 0x10

         uint8_t readEpurse[] = {ICLASS_CMD_READ_OR_IDENTIFY, 0x02, 0x61, 0x10};

706 //Read App Issuer Area block CRC(0x05) => 0xde 0x64

         uint8_t readAA[] = {ICLASS_CMD_READ_OR_IDENTIFY, 0x05, 0xde, 0x64};

708

709 uint8_t result_status = 0;

710

711 if (flags & FLAG_ICLASS_READER_INIT) {

712 Iso15693InitReader();

713 }

714

715 if (flags & FLAG_ICLASS_READER_CLEARTRACE) {

716 set_tracing(true);

717 clear_trace();

718 StartCountSspClk();

719 }

720

721 uint32_t start_time = 0;

722 uint32_t eof_time = 0;

723

         if (selectIclassTag(resp, &eof_time)) {

725 result_status = FLAG_ICLASS_READER_CSN;

                 memcpy(card_data, resp, 8);

727

728 start_time = eof_time + DELAY_ICLASS_VICC_TO_VCD_READER;

729

730 //Read block 1, config

731 if (flags & FLAG_ICLASS_READER_CONF) {

                         if (sendCmdGetResponseWithRetries(readConf, sizeof(readConf), resp, sizeof(resp), 10, 10, start_time, ICLASS_READER_TIMEOUT_OTHERS, &eof_time)) {

733 result_status |= FLAG_ICLASS_READER_CONF;

                                 memcpy(card_data+8, resp, 8);

735 } else {

736 Dbprintf("Failed to read config block");

737 }

738 start_time = eof_time + DELAY_ICLASS_VICC_TO_VCD_READER;

739 }

740

741 //Read block 2, e-purse

742 if (flags & FLAG_ICLASS_READER_CC) {

                         if (sendCmdGetResponseWithRetries(readEpurse, sizeof(readEpurse), resp, sizeof(resp), 10, 10, start_time, ICLASS_READER_TIMEOUT_OTHERS, &eof_time)) {

744 result_status |= FLAG_ICLASS_READER_CC;

                                 memcpy(card_data + (8*2), resp, 8);

746 } else {

747 Dbprintf("Failed to read e-purse");

748 }

749 start_time = eof_time + DELAY_ICLASS_VICC_TO_VCD_READER;

750 }

751

752 //Read block 5, AA

753 if (flags & FLAG_ICLASS_READER_AA) {

                         if (sendCmdGetResponseWithRetries(readAA, sizeof(readAA), resp, sizeof(resp), 10, 10, start_time, ICLASS_READER_TIMEOUT_OTHERS, &eof_time)) {

755 result_status |= FLAG_ICLASS_READER_AA;

                                 memcpy(card_data + (8*5), resp, 8);

757 } else {

758 Dbprintf("Failed to read AA block");

759 }

760 }

761 }

762

         cmd_send(CMD_ACK, result_status, 0, 0, card_data, sizeof(card_data));

764

765 LED_A_OFF();

766 }

767

768

 void iClass_Check(uint8_t *NRMAC) {

         uint8_t check[9] = {ICLASS_CMD_CHECK_KD, 0x00};

771 uint8_t resp[4];

         memcpy(check+1, NRMAC, 8);

773 uint32_t eof_time;

         bool isOK = sendCmdGetResponseWithRetries(check, sizeof(check), resp, sizeof(resp), 4, 3, 0, ICLASS_READER_TIMEOUT_OTHERS, &eof_time);

         cmd_send(CMD_ACK, isOK, 0, 0, resp, sizeof(resp));

776 }

777

778

 void iClass_Readcheck(uint8_t block, bool use_credit_key) {

         uint8_t readcheck[2] = {ICLASS_CMD_READCHECK_KD, block};

781 if (use_credit_key) {

782 readcheck[0] = ICLASS_CMD_READCHECK_KC;

783 }

784 uint8_t resp[8];

785 uint32_t eof_time;

         bool isOK = sendCmdGetResponseWithRetries(readcheck, sizeof(readcheck), resp, sizeof(resp), 8, 3, 0, ICLASS_READER_TIMEOUT_OTHERS, &eof_time);

         cmd_send(CMD_ACK, isOK, 0, 0, resp, sizeof(resp));

788 }

789

790

 static bool iClass_ReadBlock(uint8_t blockNo, uint8_t *readdata) {

         uint8_t readcmd[] = {ICLASS_CMD_READ_OR_IDENTIFY, blockNo, 0x00, 0x00}; //0x88, 0x00 // can i use 0C?

793 uint8_t bl = blockNo;

         uint16_t rdCrc = iclass_crc16(&bl, 1);

         readcmd[2] = rdCrc >> 8;

         readcmd[3] = rdCrc & 0xff;

797 uint8_t resp[10];

798 uint32_t eof_time;

799

         bool isOK = sendCmdGetResponseWithRetries(readcmd, sizeof(readcmd), resp, sizeof(resp), 10, 10, 0, ICLASS_READER_TIMEOUT_OTHERS, &eof_time);

         memcpy(readdata, resp, sizeof(resp));

802

803 return isOK;

804 }

805

806

 void iClass_ReadBlk(uint8_t blockno) {

808

809 LED_A_ON();

810

811 uint8_t readblockdata[10];

         bool isOK = iClass_ReadBlock(blockno, readblockdata);

813 FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);

814 LED_D_OFF();

         cmd_send(CMD_ACK, isOK, 0, 0, readblockdata, 8);

816

817 LED_A_OFF();

818 }

819

820

 void iClass_Dump(uint8_t startblock, uint8_t numblks) {

822

823 LED_A_ON();

824

         uint8_t readblockdata[USB_CMD_DATA_SIZE+2] = {0};

826 bool isOK = false;

827 uint16_t blkCnt = 0;

828

         if (numblks > USB_CMD_DATA_SIZE / 8) {

830 numblks = USB_CMD_DATA_SIZE / 8;

831 }

832

         for (blkCnt = 0; blkCnt < numblks; blkCnt++) {

                 isOK = iClass_ReadBlock(startblock+blkCnt, readblockdata+8*blkCnt);

835 if (!isOK) {

                         Dbprintf("Block %02X failed to read", startblock+blkCnt);

837 break;

838 }

839 }

840

841 FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);

842 LED_D_OFF();

843

         cmd_send(CMD_ACK, isOK, blkCnt, 0, readblockdata, blkCnt*8);

845

846 LED_A_OFF();

847 }

848

849

 static bool iClass_WriteBlock_ext(uint8_t blockNo, uint8_t *data) {

851

         uint8_t write[16] = {ICLASS_CMD_UPDATE, blockNo};

         memcpy(write+2, data, 12); // data + mac

         AppendCrc(write+1, 13);

855 uint8_t resp[10];

856 bool isOK = false;

857 uint32_t eof_time = 0;

858

         isOK = sendCmdGetResponseWithRetries(write, sizeof(write), resp, sizeof(resp), 10, 3, 0, ICLASS_READER_TIMEOUT_UPDATE, &eof_time);

860 if (!isOK) {

861 return false;

862 }

863

         uint8_t all_ff[8] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff};

         if (blockNo == 2) {

                 if (memcmp(data+4, resp, 4) || memcmp(data, resp+4, 4)) { // check response. e-purse update swaps first and second half

867 return false;

868 }

         } else if (blockNo == 3 || blockNo == 4) {

                 if (memcmp(all_ff, resp, 8)) { // check response. Key updates always return 0xffffffffffffffff

871 return false;

872 }

873 } else {

                 if (memcmp(data, resp, 8)) { // check response. All other updates return unchanged data

875 return false;

876 }

877 }

878

879 return true;

880 }

881

882

 void iClass_WriteBlock(uint8_t blockNo, uint8_t *data) {

884

885 LED_A_ON();

886

         bool isOK = iClass_WriteBlock_ext(blockNo, data);

888 if (isOK) {

                 Dbprintf("Write block [%02x] successful", blockNo);

890 } else {

                 Dbprintf("Write block [%02x] failed", blockNo);

892 }

893 FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);

894 LED_D_OFF();

895

         cmd_send(CMD_ACK, isOK, 0, 0, 0, 0);

897 LED_A_OFF();

898 }

899

900

 void iClass_Clone(uint8_t startblock, uint8_t endblock, uint8_t *data) {

902

903 LED_A_ON();

904

905 int written = 0;

         int total_blocks = (endblock - startblock) + 1;

907

         for (uint8_t block = startblock; block <= endblock; block++) {

909 // block number

                 if (iClass_WriteBlock_ext(block, data + (block-startblock)*12)) {

                         Dbprintf("Write block [%02x] successful", block);

912 written++;

913 } else {

                         Dbprintf("Write block [%02x] failed", block);

915 }

916 }

917

918 if (written == total_blocks)

919 Dbprintf("Clone complete");

920 else

921 Dbprintf("Clone incomplete");

922

923 FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);

924 LED_D_OFF();

925

         cmd_send(CMD_ACK, 1, 0, 0, 0, 0);

927 LED_A_OFF();

928 }