client/cmdlfem4x.c

   1 //-----------------------------------------------------------------------------
   2 // Copyright (C) 2010 iZsh <izsh at fail0verflow.com>
   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 // Low frequency EM4x commands
   9 //-----------------------------------------------------------------------------
  10
  11 #include <stdio.h>
  12 #include <string.h>
  13 #include <inttypes.h>
  14 #include "proxmark3.h"
  15 #include "ui.h"
  16 #include "util.h"
  17 #include "graph.h"
  18 #include "cmdparser.h"
  19 #include "cmddata.h"
  20 #include "cmdlf.h"
  21 #include "cmdlfem4x.h"
  22 char *global_em410xId;
  23
  24 static int CmdHelp(const char *Cmd);
  25
  26 int CmdEMdemodASK(const char *Cmd)
  27 {
  28         char cmdp = param_getchar(Cmd, 0);
  29         int findone = (cmdp == '1') ? 1 : 0;
  30   UsbCommand c={CMD_EM410X_DEMOD};
  31   c.arg[0]=findone;
  32   SendCommand(&c);
  33   return 0;
  34 }
  35
  36 /* Read the ID of an EM410x tag.
  37  * Format:
  38  *   1111 1111 1           <-- standard non-repeatable header
  39  *   XXXX [row parity bit] <-- 10 rows of 5 bits for our 40 bit tag ID
  40  *   ....
  41  *   CCCC                  <-- each bit here is parity for the 10 bits above in corresponding column
  42  *   0                     <-- stop bit, end of tag
  43  */
  44 int CmdEM410xRead(const char *Cmd)
  45 {
  46   uint32_t hi=0;
  47   uint64_t lo=0;
  48
  49   if(!AskEm410xDemod("", &hi, &lo)) return 0;
  50   PrintAndLog("EM410x pattern found: ");
  51   printEM410x(hi, lo);
  52   if (hi){
  53     PrintAndLog ("EM410x XL pattern found");
  54     return 0;
  55   }
  56   char id[12] = {0x00};
  57   sprintf(id, "%010llx",lo);
  58
  59   global_em410xId = id;
  60   return 1;
  61 }
  62
  63 // emulate an EM410X tag
  64 int CmdEM410xSim(const char *Cmd)
  65 {
  66         int i, n, j, binary[4], parity[4];
  67
  68         char cmdp = param_getchar(Cmd, 0);
  69         uint8_t uid[5] = {0x00};
  70
  71         if (cmdp == 'h' || cmdp == 'H') {
  72                 PrintAndLog("Usage:  lf em4x 410xsim <UID>");
  73                 PrintAndLog("");
  74                 PrintAndLog("     sample: lf em4x 410xsim 0F0368568B");
  75                 return 0;
  76         }
  77
  78         if (param_gethex(Cmd, 0, uid, 10)) {
  79                 PrintAndLog("UID must include 10 HEX symbols");
  80                 return 0;
  81         }
  82
  83         PrintAndLog("Starting simulating UID %02X%02X%02X%02X%02X", uid[0],uid[1],uid[2],uid[3],uid[4]);
  84         PrintAndLog("Press pm3-button to about simulation");
  85
  86   /* clock is 64 in EM410x tags */
  87   int clock = 64;
  88
  89   /* clear our graph */
  90   ClearGraph(0);
  91
  92     /* write 9 start bits */
  93     for (i = 0; i < 9; i++)
  94       AppendGraph(0, clock, 1);
  95
  96     /* for each hex char */
  97     parity[0] = parity[1] = parity[2] = parity[3] = 0;
  98     for (i = 0; i < 10; i++)
  99     {
 100       /* read each hex char */
 101       sscanf(&Cmd[i], "%1x", &n);
 102       for (j = 3; j >= 0; j--, n/= 2)
 103         binary[j] = n % 2;
 104
 105       /* append each bit */
 106       AppendGraph(0, clock, binary[0]);
 107       AppendGraph(0, clock, binary[1]);
 108       AppendGraph(0, clock, binary[2]);
 109       AppendGraph(0, clock, binary[3]);
 110
 111       /* append parity bit */
 112       AppendGraph(0, clock, binary[0] ^ binary[1] ^ binary[2] ^ binary[3]);
 113
 114       /* keep track of column parity */
 115       parity[0] ^= binary[0];
 116       parity[1] ^= binary[1];
 117       parity[2] ^= binary[2];
 118       parity[3] ^= binary[3];
 119     }
 120
 121     /* parity columns */
 122     AppendGraph(0, clock, parity[0]);
 123     AppendGraph(0, clock, parity[1]);
 124     AppendGraph(0, clock, parity[2]);
 125     AppendGraph(0, clock, parity[3]);
 126
 127     /* stop bit */
 128   AppendGraph(1, clock, 0);
 129
 130   CmdLFSim("0"); //240 start_gap.
 131   return 0;
 132 }
 133
 134 /* Function is equivalent of lf read + data samples + em410xread
 135  * looped until an EM410x tag is detected
 136  *
 137  * Why is CmdSamples("16000")?
 138  *  TBD: Auto-grow sample size based on detected sample rate.  IE: If the
 139  *       rate gets lower, then grow the number of samples
 140  *  Changed by martin, 4000 x 4 = 16000,
 141  *  see http://www.proxmark.org/forum/viewtopic.php?pid=7235#p7235
 142
 143 */
 144 int CmdEM410xWatch(const char *Cmd)
 145 {
 146         do {
 147                 if (ukbhit()) {
 148                         printf("\naborted via keyboard!\n");
 149                         break;
 150                 }
 151
 152                 CmdLFRead("s");
 153                 getSamples("8192",true); //capture enough to get 2 full messages
 154         } while (!CmdEM410xRead(""));
 155
 156         return 0;
 157 }
 158
 159 int CmdEM410xWatchnSpoof(const char *Cmd)
 160 {
 161         CmdEM410xWatch(Cmd);
 162         PrintAndLog("# Replaying captured ID: %s",global_em410xId);
 163         CmdLFaskSim("");
 164         return 0;
 165 }
 166
 167 /* Read the transmitted data of an EM4x50 tag
 168  * Format:
 169  *
 170  *  XXXXXXXX [row parity bit (even)] <- 8 bits plus parity
 171  *  XXXXXXXX [row parity bit (even)] <- 8 bits plus parity
 172  *  XXXXXXXX [row parity bit (even)] <- 8 bits plus parity
 173  *  XXXXXXXX [row parity bit (even)] <- 8 bits plus parity
 174  *  CCCCCCCC                         <- column parity bits
 175  *  0                                <- stop bit
 176  *  LW                               <- Listen Window
 177  *
 178  * This pattern repeats for every block of data being transmitted.
 179  * Transmission starts with two Listen Windows (LW - a modulated
 180  * pattern of 320 cycles each (32/32/128/64/64)).
 181  *
 182  * Note that this data may or may not be the UID. It is whatever data
 183  * is stored in the blocks defined in the control word First and Last
 184  * Word Read values. UID is stored in block 32.
 185  */
 186 int CmdEM4x50Read(const char *Cmd)
 187 {
 188   int i, j, startblock, skip, block, start, end, low, high;
 189   bool complete= false;
 190   int tmpbuff[MAX_GRAPH_TRACE_LEN / 64];
 191   char tmp[6];
 192
 193   high= low= 0;
 194   memset(tmpbuff, 0, MAX_GRAPH_TRACE_LEN / 64);
 195
 196   /* first get high and low values */
 197   for (i = 0; i < GraphTraceLen; i++)
 198   {
 199     if (GraphBuffer[i] > high)
 200       high = GraphBuffer[i];
 201     else if (GraphBuffer[i] < low)
 202       low = GraphBuffer[i];
 203   }
 204
 205   /* populate a buffer with pulse lengths */
 206   i= 0;
 207   j= 0;
 208   while (i < GraphTraceLen)
 209   {
 210     // measure from low to low
 211     while ((GraphBuffer[i] > low) && (i<GraphTraceLen))
 212       ++i;
 213     start= i;
 214     while ((GraphBuffer[i] < high) && (i<GraphTraceLen))
 215       ++i;
 216     while ((GraphBuffer[i] > low) && (i<GraphTraceLen))
 217       ++i;
 218     if (j>=(MAX_GRAPH_TRACE_LEN/64)) {
 219       break;
 220     }
 221     tmpbuff[j++]= i - start;
 222   }
 223
 224   /* look for data start - should be 2 pairs of LW (pulses of 192,128) */
 225   start= -1;
 226   skip= 0;
 227   for (i= 0; i < j - 4 ; ++i)
 228   {
 229     skip += tmpbuff[i];
 230     if (tmpbuff[i] >= 190 && tmpbuff[i] <= 194)
 231       if (tmpbuff[i+1] >= 126 && tmpbuff[i+1] <= 130)
 232         if (tmpbuff[i+2] >= 190 && tmpbuff[i+2] <= 194)
 233           if (tmpbuff[i+3] >= 126 && tmpbuff[i+3] <= 130)
 234           {
 235             start= i + 3;
 236             break;
 237           }
 238   }
 239   startblock= i + 3;
 240
 241   /* skip over the remainder of the LW */
 242   skip += tmpbuff[i+1]+tmpbuff[i+2];
 243   while (skip < MAX_GRAPH_TRACE_LEN && GraphBuffer[skip] > low)
 244     ++skip;
 245   skip += 8;
 246
 247   /* now do it again to find the end */
 248   end= start;
 249   for (i += 3; i < j - 4 ; ++i)
 250   {
 251     end += tmpbuff[i];
 252     if (tmpbuff[i] >= 190 && tmpbuff[i] <= 194)
 253       if (tmpbuff[i+1] >= 126 && tmpbuff[i+1] <= 130)
 254         if (tmpbuff[i+2] >= 190 && tmpbuff[i+2] <= 194)
 255           if (tmpbuff[i+3] >= 126 && tmpbuff[i+3] <= 130)
 256           {
 257             complete= true;
 258             break;
 259           }
 260   }
 261
 262   if (start >= 0)
 263     PrintAndLog("Found data at sample: %i",skip);
 264   else
 265   {
 266     PrintAndLog("No data found!");
 267     PrintAndLog("Try again with more samples.");
 268     return 0;
 269   }
 270
 271   if (!complete)
 272   {
 273     PrintAndLog("*** Warning!");
 274     PrintAndLog("Partial data - no end found!");
 275     PrintAndLog("Try again with more samples.");
 276   }
 277
 278   /* get rid of leading crap */
 279   sprintf(tmp,"%i",skip);
 280   CmdLtrim(tmp);
 281
 282   /* now work through remaining buffer printing out data blocks */
 283   block= 0;
 284   i= startblock;
 285   while (block < 6)
 286   {
 287     PrintAndLog("Block %i:", block);
 288     // mandemod routine needs to be split so we can call it for data
 289     // just print for now for debugging
 290     CmdManchesterDemod("i 64");
 291     skip= 0;
 292     /* look for LW before start of next block */
 293     for ( ; i < j - 4 ; ++i)
 294     {
 295       skip += tmpbuff[i];
 296       if (tmpbuff[i] >= 190 && tmpbuff[i] <= 194)
 297         if (tmpbuff[i+1] >= 126 && tmpbuff[i+1] <= 130)
 298           break;
 299     }
 300     while (GraphBuffer[skip] > low)
 301       ++skip;
 302     skip += 8;
 303     sprintf(tmp,"%i",skip);
 304     CmdLtrim(tmp);
 305     start += skip;
 306     block++;
 307   }
 308   return 0;
 309 }
 310
 311 int CmdEM410xWrite(const char *Cmd)
 312 {
 313   uint64_t id = 0xFFFFFFFFFFFFFFFF; // invalid id value
 314   int card = 0xFF; // invalid card value
 315         unsigned int clock = 0; // invalid clock value
 316
 317         sscanf(Cmd, "%" PRIx64 " %d %d", &id, &card, &clock);
 318
 319         // Check ID
 320         if (id == 0xFFFFFFFFFFFFFFFF) {
 321                 PrintAndLog("Error! ID is required.\n");
 322                 return 0;
 323         }
 324         if (id >= 0x10000000000) {
 325                 PrintAndLog("Error! Given EM410x ID is longer than 40 bits.\n");
 326                 return 0;
 327         }
 328
 329         // Check Card
 330         if (card == 0xFF) {
 331                 PrintAndLog("Error! Card type required.\n");
 332                 return 0;
 333         }
 334         if (card < 0) {
 335                 PrintAndLog("Error! Bad card type selected.\n");
 336                 return 0;
 337         }
 338
 339         // Check Clock
 340         if (card == 1)
 341         {
 342                 // Default: 64
 343                 if (clock == 0)
 344                         clock = 64;
 345
 346                 // Allowed clock rates: 16, 32 and 64
 347                 if ((clock != 16) && (clock != 32) && (clock != 64)) {
 348                         PrintAndLog("Error! Clock rate %d not valid. Supported clock rates are 16, 32 and 64.\n", clock);
 349                         return 0;
 350                 }
 351         }
 352         else if (clock != 0)
 353         {
 354                 PrintAndLog("Error! Clock rate is only supported on T55x7 tags.\n");
 355                 return 0;
 356         }
 357
 358         if (card == 1) {
 359                 PrintAndLog("Writing %s tag with UID 0x%010" PRIx64 " (clock rate: %d)", "T55x7", id, clock);
 360                 // NOTE: We really should pass the clock in as a separate argument, but to
 361                 //   provide for backwards-compatibility for older firmware, and to avoid
 362                 //   having to add another argument to CMD_EM410X_WRITE_TAG, we just store
 363                 //   the clock rate in bits 8-15 of the card value
 364                 card = (card & 0xFF) | (((uint64_t)clock << 8) & 0xFF00);
 365         }
 366         else if (card == 0)
 367                 PrintAndLog("Writing %s tag with UID 0x%010" PRIx64, "T5555", id, clock);
 368         else {
 369                 PrintAndLog("Error! Bad card type selected.\n");
 370                 return 0;
 371         }
 372
 373   UsbCommand c = {CMD_EM410X_WRITE_TAG, {card, (uint32_t)(id >> 32), (uint32_t)id}};
 374   SendCommand(&c);
 375
 376   return 0;
 377 }
 378
 379 int CmdReadWord(const char *Cmd)
 380 {
 381         int Word = -1; //default to invalid word
 382   UsbCommand c;
 383
 384   sscanf(Cmd, "%d", &Word);
 385
 386         if ( (Word > 15) | (Word < 0) ) {
 387     PrintAndLog("Word must be between 0 and 15");
 388     return 1;
 389   }
 390
 391   PrintAndLog("Reading word %d", Word);
 392
 393   c.cmd = CMD_EM4X_READ_WORD;
 394   c.d.asBytes[0] = 0x0; //Normal mode
 395   c.arg[0] = 0;
 396   c.arg[1] = Word;
 397   c.arg[2] = 0;
 398   SendCommand(&c);
 399   return 0;
 400 }
 401
 402 int CmdReadWordPWD(const char *Cmd)
 403 {
 404         int Word = -1; //default to invalid word
 405   int Password = 0xFFFFFFFF; //default to blank password
 406   UsbCommand c;
 407
 408   sscanf(Cmd, "%d %x", &Word, &Password);
 409
 410         if ( (Word > 15) | (Word < 0) ) {
 411     PrintAndLog("Word must be between 0 and 15");
 412     return 1;
 413   }
 414
 415   PrintAndLog("Reading word %d with password %08X", Word, Password);
 416
 417   c.cmd = CMD_EM4X_READ_WORD;
 418   c.d.asBytes[0] = 0x1; //Password mode
 419   c.arg[0] = 0;
 420   c.arg[1] = Word;
 421   c.arg[2] = Password;
 422   SendCommand(&c);
 423   return 0;
 424 }
 425
 426 int CmdWriteWord(const char *Cmd)
 427 {
 428   int Word = 16; //default to invalid block
 429   int Data = 0xFFFFFFFF; //default to blank data
 430   UsbCommand c;
 431
 432   sscanf(Cmd, "%x %d", &Data, &Word);
 433
 434   if (Word > 15) {
 435     PrintAndLog("Word must be between 0 and 15");
 436     return 1;
 437   }
 438
 439   PrintAndLog("Writing word %d with data %08X", Word, Data);
 440
 441   c.cmd = CMD_EM4X_WRITE_WORD;
 442   c.d.asBytes[0] = 0x0; //Normal mode
 443   c.arg[0] = Data;
 444   c.arg[1] = Word;
 445   c.arg[2] = 0;
 446   SendCommand(&c);
 447   return 0;
 448 }
 449
 450 int CmdWriteWordPWD(const char *Cmd)
 451 {
 452   int Word = 16; //default to invalid word
 453   int Data = 0xFFFFFFFF; //default to blank data
 454   int Password = 0xFFFFFFFF; //default to blank password
 455   UsbCommand c;
 456
 457   sscanf(Cmd, "%x %d %x", &Data, &Word, &Password);
 458
 459   if (Word > 15) {
 460     PrintAndLog("Word must be between 0 and 15");
 461     return 1;
 462   }
 463
 464   PrintAndLog("Writing word %d with data %08X and password %08X", Word, Data, Password);
 465
 466   c.cmd = CMD_EM4X_WRITE_WORD;
 467   c.d.asBytes[0] = 0x1; //Password mode
 468   c.arg[0] = Data;
 469   c.arg[1] = Word;
 470   c.arg[2] = Password;
 471   SendCommand(&c);
 472   return 0;
 473 }
 474
 475 static command_t CommandTable[] =
 476 {
 477   {"help", CmdHelp, 1, "This help"},
 478   {"em410xdemod", CmdEMdemodASK, 0, "[findone] -- Extract ID from EM410x tag (option 0 for continuous loop, 1 for only 1 tag)"},
 479   {"em410xread", CmdEM410xRead, 1, "[clock rate] -- Extract ID from EM410x tag"},
 480   {"em410xsim", CmdEM410xSim, 0, "<UID> -- Simulate EM410x tag"},
 481   {"em410xwatch", CmdEM410xWatch, 0, "['h'] -- Watches for EM410x 125/134 kHz tags (option 'h' for 134)"},
 482   {"em410xspoof", CmdEM410xWatchnSpoof, 0, "['h'] --- Watches for EM410x 125/134 kHz tags, and replays them. (option 'h' for 134)" },
 483   {"em410xwrite", CmdEM410xWrite, 1, "<UID> <'0' T5555> <'1' T55x7> [clock rate] -- Write EM410x UID to T5555(Q5) or T55x7 tag, optionally setting clock rate"},
 484   {"em4x50read", CmdEM4x50Read, 1, "Extract data from EM4x50 tag"},
 485   {"readword", CmdReadWord, 1, "<Word> -- Read EM4xxx word data"},
 486   {"readwordPWD", CmdReadWordPWD, 1, "<Word> <Password> -- Read EM4xxx word data in password mode"},
 487   {"writeword", CmdWriteWord, 1, "<Data> <Word> -- Write EM4xxx word data"},
 488   {"writewordPWD", CmdWriteWordPWD, 1, "<Data> <Word> <Password> -- Write EM4xxx word data in password mode"},
 489   {NULL, NULL, 0, NULL}
 490 };
 491
 492 int CmdLFEM4X(const char *Cmd)
 493 {
 494   CmdsParse(CommandTable, Cmd);
 495   return 0;
 496 }
 497
 498 int CmdHelp(const char *Cmd)
 499 {
 500   CmdsHelp(CommandTable);
 501   return 0;
 502 }