cvs.zerfleddert.de Git - proxmark3-svn/blob - 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[11] = {0x00};
  57   sprintf(id, "%010x", lo);
  58   global_em410xId = id;
  59   return 1;
  60 }
  61
  62 // emulate an EM410X tag
  63 int CmdEM410xSim(const char *Cmd)
  64 {
  65         int i, n, j, binary[4], parity[4];
  66
  67         char cmdp = param_getchar(Cmd, 0);
  68         uint8_t uid[5] = {0x00};
  69
  70         if (cmdp == 'h' || cmdp == 'H') {
  71                 PrintAndLog("Usage:  lf em4x 410xsim <UID>");
  72                 PrintAndLog("");
  73                 PrintAndLog("     sample: lf em4x 410xsim 0F0368568B");
  74                 return 0;
  75         }
  76
  77         if (param_gethex(Cmd, 0, uid, 10)) {
  78                 PrintAndLog("UID must include 10 HEX symbols");
  79                 return 0;
  80         }
  81
  82         PrintAndLog("Starting simulating UID %02X%02X%02X%02X%02X", uid[0],uid[1],uid[2],uid[3],uid[4]);
  83         PrintAndLog("Press pm3-button to about simulation");
  84
  85   /* clock is 64 in EM410x tags */
  86   int clock = 64;
  87
  88   /* clear our graph */
  89   ClearGraph(0);
  90
  91     /* write 9 start bits */
  92     for (i = 0; i < 9; i++)
  93       AppendGraph(0, clock, 1);
  94
  95     /* for each hex char */
  96     parity[0] = parity[1] = parity[2] = parity[3] = 0;
  97     for (i = 0; i < 10; i++)
  98     {
  99       /* read each hex char */
 100       sscanf(&Cmd[i], "%1x", &n);
 101       for (j = 3; j >= 0; j--, n/= 2)
 102         binary[j] = n % 2;
 103
 104       /* append each bit */
 105       AppendGraph(0, clock, binary[0]);
 106       AppendGraph(0, clock, binary[1]);
 107       AppendGraph(0, clock, binary[2]);
 108       AppendGraph(0, clock, binary[3]);
 109
 110       /* append parity bit */
 111       AppendGraph(0, clock, binary[0] ^ binary[1] ^ binary[2] ^ binary[3]);
 112
 113       /* keep track of column parity */
 114       parity[0] ^= binary[0];
 115       parity[1] ^= binary[1];
 116       parity[2] ^= binary[2];
 117       parity[3] ^= binary[3];
 118     }
 119
 120     /* parity columns */
 121     AppendGraph(0, clock, parity[0]);
 122     AppendGraph(0, clock, parity[1]);
 123     AppendGraph(0, clock, parity[2]);
 124     AppendGraph(0, clock, parity[3]);
 125
 126     /* stop bit */
 127   AppendGraph(1, clock, 0);
 128
 129   CmdLFSim("0"); //240 start_gap.
 130   return 0;
 131 }
 132
 133 /* Function is equivalent of lf read + data samples + em410xread
 134  * looped until an EM410x tag is detected
 135  *
 136  * Why is CmdSamples("16000")?
 137  *  TBD: Auto-grow sample size based on detected sample rate.  IE: If the
 138  *       rate gets lower, then grow the number of samples
 139  *  Changed by martin, 4000 x 4 = 16000,
 140  *  see http://www.proxmark.org/forum/viewtopic.php?pid=7235#p7235
 141
 142 */
 143 int CmdEM410xWatch(const char *Cmd)
 144 {
 145         do {
 146                 if (ukbhit()) {
 147                         printf("\naborted via keyboard!\n");
 148                         break;
 149                 }
 150
 151                 CmdLFRead("");
 152                 CmdSamples("6000");
 153         } while (!CmdEM410xRead(""));
 154
 155         return 0;
 156 }
 157
 158 int CmdEM410xWatchnSpoof(const char *Cmd)
 159 {
 160         CmdEM410xWatch(Cmd);
 161     PrintAndLog("# Replaying captured ID: %s",global_em410xId);
 162     CmdLFaskSim("");
 163   return 0;
 164 }
 165
 166 /* Read the transmitted data of an EM4x50 tag
 167  * Format:
 168  *
 169  *  XXXXXXXX [row parity bit (even)] <- 8 bits plus parity
 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  *  CCCCCCCC                         <- column parity bits
 174  *  0                                <- stop bit
 175  *  LW                               <- Listen Window
 176  *
 177  * This pattern repeats for every block of data being transmitted.
 178  * Transmission starts with two Listen Windows (LW - a modulated
 179  * pattern of 320 cycles each (32/32/128/64/64)).
 180  *
 181  * Note that this data may or may not be the UID. It is whatever data
 182  * is stored in the blocks defined in the control word First and Last
 183  * Word Read values. UID is stored in block 32.
 184  */
 185 int CmdEM4x50Read(const char *Cmd)
 186 {
 187   int i, j, startblock, skip, block, start, end, low, high;
 188   bool complete= false;
 189   int tmpbuff[MAX_GRAPH_TRACE_LEN / 64];
 190   char tmp[6];
 191
 192   high= low= 0;
 193   memset(tmpbuff, 0, MAX_GRAPH_TRACE_LEN / 64);
 194
 195   /* first get high and low values */
 196   for (i = 0; i < GraphTraceLen; i++)
 197   {
 198     if (GraphBuffer[i] > high)
 199       high = GraphBuffer[i];
 200     else if (GraphBuffer[i] < low)
 201       low = GraphBuffer[i];
 202   }
 203
 204   /* populate a buffer with pulse lengths */
 205   i= 0;
 206   j= 0;
 207   while (i < GraphTraceLen)
 208   {
 209     // measure from low to low
 210     while ((GraphBuffer[i] > low) && (i<GraphTraceLen))
 211       ++i;
 212     start= i;
 213     while ((GraphBuffer[i] < high) && (i<GraphTraceLen))
 214       ++i;
 215     while ((GraphBuffer[i] > low) && (i<GraphTraceLen))
 216       ++i;
 217     if (j>=(MAX_GRAPH_TRACE_LEN/64)) {
 218       break;
 219     }
 220     tmpbuff[j++]= i - start;
 221   }
 222
 223   /* look for data start - should be 2 pairs of LW (pulses of 192,128) */
 224   start= -1;
 225   skip= 0;
 226   for (i= 0; i < j - 4 ; ++i)
 227   {
 228     skip += tmpbuff[i];
 229     if (tmpbuff[i] >= 190 && tmpbuff[i] <= 194)
 230       if (tmpbuff[i+1] >= 126 && tmpbuff[i+1] <= 130)
 231         if (tmpbuff[i+2] >= 190 && tmpbuff[i+2] <= 194)
 232           if (tmpbuff[i+3] >= 126 && tmpbuff[i+3] <= 130)
 233           {
 234             start= i + 3;
 235             break;
 236           }
 237   }
 238   startblock= i + 3;
 239
 240   /* skip over the remainder of the LW */
 241   skip += tmpbuff[i+1]+tmpbuff[i+2];
 242   while (skip < MAX_GRAPH_TRACE_LEN && GraphBuffer[skip] > low)
 243     ++skip;
 244   skip += 8;
 245
 246   /* now do it again to find the end */
 247   end= start;
 248   for (i += 3; i < j - 4 ; ++i)
 249   {
 250     end += tmpbuff[i];
 251     if (tmpbuff[i] >= 190 && tmpbuff[i] <= 194)
 252       if (tmpbuff[i+1] >= 126 && tmpbuff[i+1] <= 130)
 253         if (tmpbuff[i+2] >= 190 && tmpbuff[i+2] <= 194)
 254           if (tmpbuff[i+3] >= 126 && tmpbuff[i+3] <= 130)
 255           {
 256             complete= true;
 257             break;
 258           }
 259   }
 260
 261   if (start >= 0)
 262     PrintAndLog("Found data at sample: %i",skip);
 263   else
 264   {
 265     PrintAndLog("No data found!");
 266     PrintAndLog("Try again with more samples.");
 267     return 0;
 268   }
 269
 270   if (!complete)
 271   {
 272     PrintAndLog("*** Warning!");
 273     PrintAndLog("Partial data - no end found!");
 274     PrintAndLog("Try again with more samples.");
 275   }
 276
 277   /* get rid of leading crap */
 278   sprintf(tmp,"%i",skip);
 279   CmdLtrim(tmp);
 280
 281   /* now work through remaining buffer printing out data blocks */
 282   block= 0;
 283   i= startblock;
 284   while (block < 6)
 285   {
 286     PrintAndLog("Block %i:", block);
 287     // mandemod routine needs to be split so we can call it for data
 288     // just print for now for debugging
 289     CmdManchesterDemod("i 64");
 290     skip= 0;
 291     /* look for LW before start of next block */
 292     for ( ; i < j - 4 ; ++i)
 293     {
 294       skip += tmpbuff[i];
 295       if (tmpbuff[i] >= 190 && tmpbuff[i] <= 194)
 296         if (tmpbuff[i+1] >= 126 && tmpbuff[i+1] <= 130)
 297           break;
 298     }
 299     while (GraphBuffer[skip] > low)
 300       ++skip;
 301     skip += 8;
 302     sprintf(tmp,"%i",skip);
 303     CmdLtrim(tmp);
 304     start += skip;
 305     block++;
 306   }
 307   return 0;
 308 }
 309
 310 int CmdEM410xWrite(const char *Cmd)
 311 {
 312   uint64_t id = 0xFFFFFFFFFFFFFFFF; // invalid id value
 313   int card = 0xFF; // invalid card value
 314         unsigned int clock = 0; // invalid clock value
 315
 316         sscanf(Cmd, "%" PRIx64 " %d %d", &id, &card, &clock);
 317
 318         // Check ID
 319         if (id == 0xFFFFFFFFFFFFFFFF) {
 320                 PrintAndLog("Error! ID is required.\n");
 321                 return 0;
 322         }
 323         if (id >= 0x10000000000) {
 324                 PrintAndLog("Error! Given EM410x ID is longer than 40 bits.\n");
 325                 return 0;
 326         }
 327
 328         // Check Card
 329         if (card == 0xFF) {
 330                 PrintAndLog("Error! Card type required.\n");
 331                 return 0;
 332         }
 333         if (card < 0) {
 334                 PrintAndLog("Error! Bad card type selected.\n");
 335                 return 0;
 336         }
 337
 338         // Check Clock
 339         if (card == 1)
 340         {
 341                 // Default: 64
 342                 if (clock == 0)
 343                         clock = 64;
 344
 345                 // Allowed clock rates: 16, 32 and 64
 346                 if ((clock != 16) && (clock != 32) && (clock != 64)) {
 347                         PrintAndLog("Error! Clock rate %d not valid. Supported clock rates are 16, 32 and 64.\n", clock);
 348                         return 0;
 349                 }
 350         }
 351         else if (clock != 0)
 352         {
 353                 PrintAndLog("Error! Clock rate is only supported on T55x7 tags.\n");
 354                 return 0;
 355         }
 356
 357         if (card == 1) {
 358                 PrintAndLog("Writing %s tag with UID 0x%010" PRIx64 " (clock rate: %d)", "T55x7", id, clock);
 359                 // NOTE: We really should pass the clock in as a separate argument, but to
 360                 //   provide for backwards-compatibility for older firmware, and to avoid
 361                 //   having to add another argument to CMD_EM410X_WRITE_TAG, we just store
 362                 //   the clock rate in bits 8-15 of the card value
 363                 card = (card & 0xFF) | (((uint64_t)clock << 8) & 0xFF00);
 364         }
 365         else if (card == 0)
 366                 PrintAndLog("Writing %s tag with UID 0x%010" PRIx64, "T5555", id, clock);
 367         else {
 368                 PrintAndLog("Error! Bad card type selected.\n");
 369                 return 0;
 370         }
 371
 372   UsbCommand c = {CMD_EM410X_WRITE_TAG, {card, (uint32_t)(id >> 32), (uint32_t)id}};
 373   SendCommand(&c);
 374
 375   return 0;
 376 }
 377
 378 int CmdReadWord(const char *Cmd)
 379 {
 380         int Word = -1; //default to invalid word
 381   UsbCommand c;
 382
 383   sscanf(Cmd, "%d", &Word);
 384
 385         if ( (Word > 15) | (Word < 0) ) {
 386     PrintAndLog("Word must be between 0 and 15");
 387     return 1;
 388   }
 389
 390   PrintAndLog("Reading word %d", Word);
 391
 392   c.cmd = CMD_EM4X_READ_WORD;
 393   c.d.asBytes[0] = 0x0; //Normal mode
 394   c.arg[0] = 0;
 395   c.arg[1] = Word;
 396   c.arg[2] = 0;
 397   SendCommand(&c);
 398   return 0;
 399 }
 400
 401 int CmdReadWordPWD(const char *Cmd)
 402 {
 403         int Word = -1; //default to invalid word
 404   int Password = 0xFFFFFFFF; //default to blank password
 405   UsbCommand c;
 406
 407   sscanf(Cmd, "%d %x", &Word, &Password);
 408
 409         if ( (Word > 15) | (Word < 0) ) {
 410     PrintAndLog("Word must be between 0 and 15");
 411     return 1;
 412   }
 413
 414   PrintAndLog("Reading word %d with password %08X", Word, Password);
 415
 416   c.cmd = CMD_EM4X_READ_WORD;
 417   c.d.asBytes[0] = 0x1; //Password mode
 418   c.arg[0] = 0;
 419   c.arg[1] = Word;
 420   c.arg[2] = Password;
 421   SendCommand(&c);
 422   return 0;
 423 }
 424
 425 int CmdWriteWord(const char *Cmd)
 426 {
 427   int Word = 16; //default to invalid block
 428   int Data = 0xFFFFFFFF; //default to blank data
 429   UsbCommand c;
 430
 431   sscanf(Cmd, "%x %d", &Data, &Word);
 432
 433   if (Word > 15) {
 434     PrintAndLog("Word must be between 0 and 15");
 435     return 1;
 436   }
 437
 438   PrintAndLog("Writing word %d with data %08X", Word, Data);
 439
 440   c.cmd = CMD_EM4X_WRITE_WORD;
 441   c.d.asBytes[0] = 0x0; //Normal mode
 442   c.arg[0] = Data;
 443   c.arg[1] = Word;
 444   c.arg[2] = 0;
 445   SendCommand(&c);
 446   return 0;
 447 }
 448
 449 int CmdWriteWordPWD(const char *Cmd)
 450 {
 451   int Word = 16; //default to invalid word
 452   int Data = 0xFFFFFFFF; //default to blank data
 453   int Password = 0xFFFFFFFF; //default to blank password
 454   UsbCommand c;
 455
 456   sscanf(Cmd, "%x %d %x", &Data, &Word, &Password);
 457
 458   if (Word > 15) {
 459     PrintAndLog("Word must be between 0 and 15");
 460     return 1;
 461   }
 462
 463   PrintAndLog("Writing word %d with data %08X and password %08X", Word, Data, Password);
 464
 465   c.cmd = CMD_EM4X_WRITE_WORD;
 466   c.d.asBytes[0] = 0x1; //Password mode
 467   c.arg[0] = Data;
 468   c.arg[1] = Word;
 469   c.arg[2] = Password;
 470   SendCommand(&c);
 471   return 0;
 472 }
 473
 474 static command_t CommandTable[] =
 475 {
 476   {"help", CmdHelp, 1, "This help"},
 477   {"em410xdemod", CmdEMdemodASK, 0, "[findone] -- Extract ID from EM410x tag (option 0 for continuous loop, 1 for only 1 tag)"},
 478   {"em410xread", CmdEM410xRead, 1, "[clock rate] -- Extract ID from EM410x tag"},
 479   {"em410xsim", CmdEM410xSim, 0, "<UID> -- Simulate EM410x tag"},
 480   {"em410xwatch", CmdEM410xWatch, 0, "['h'] -- Watches for EM410x 125/134 kHz tags (option 'h' for 134)"},
 481   {"em410xspoof", CmdEM410xWatchnSpoof, 0, "['h'] --- Watches for EM410x 125/134 kHz tags, and replays them. (option 'h' for 134)" },
 482   {"em410xwrite", CmdEM410xWrite, 1, "<UID> <'0' T5555> <'1' T55x7> [clock rate] -- Write EM410x UID to T5555(Q5) or T55x7 tag, optionally setting clock rate"},
 483   {"em4x50read", CmdEM4x50Read, 1, "Extract data from EM4x50 tag"},
 484   {"readword", CmdReadWord, 1, "<Word> -- Read EM4xxx word data"},
 485   {"readwordPWD", CmdReadWordPWD, 1, "<Word> <Password> -- Read EM4xxx word data in password mode"},
 486   {"writeword", CmdWriteWord, 1, "<Data> <Word> -- Write EM4xxx word data"},
 487   {"writewordPWD", CmdWriteWordPWD, 1, "<Data> <Word> <Password> -- Write EM4xxx word data in password mode"},
 488   {NULL, NULL, 0, NULL}
 489 };
 490
 491 int CmdLFEM4X(const char *Cmd)
 492 {
 493   CmdsParse(CommandTable, Cmd);
 494   return 0;
 495 }
 496
 497 int CmdHelp(const char *Cmd)
 498 {
 499   CmdsHelp(CommandTable);
 500   return 0;
 501 }