cvs.zerfleddert.de Git - proxmark3-svn/blob - client/cmdhflegic.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 // High frequency Legic commands
   9 //-----------------------------------------------------------------------------
  10
  11 #include <stdio.h>
  12 #include <string.h>
  13 #include "proxmark3.h"
  14 #include "data.h"
  15 #include "ui.h"
  16 #include "cmdparser.h"
  17 #include "cmdhflegic.h"
  18 #include "cmdmain.h"
  19 #include "util.h"
  20 #include "crc.h"
  21 static int CmdHelp(const char *Cmd);
  22
  23 int usage_legic_calccrc8(void){
  24         PrintAndLog("Calculates the legic crc8 on the input hexbytes.");
  25         PrintAndLog("There must be an even number of hexsymbols as input.");
  26         PrintAndLog("Usage:  hf legic crc8 <hexbytes>");
  27         PrintAndLog("Options :");
  28         PrintAndLog("  <hexbytes>   : hex bytes in a string");
  29         PrintAndLog("");
  30         PrintAndLog("Sample  : hf legic crc8 deadbeef1122");
  31         return 0;
  32 }
  33
  34 int usage_legic_load(void){
  35         PrintAndLog("It loads datasamples from the file `filename` to device memory");
  36         PrintAndLog("Usage:  hf legic load <file name>");
  37         PrintAndLog(" sample: hf legic load filename");
  38         return 0;
  39 }
  40
  41 /*
  42  *  Output BigBuf and deobfuscate LEGIC RF tag data.
  43  *   This is based on information given in the talk held
  44  *  by Henryk Ploetz and Karsten Nohl at 26c3
  45  */
  46 int CmdLegicDecode(const char *Cmd) {
  47         // Index for the bytearray.
  48         int i = 0;
  49         int k = 0, segmentNum;
  50         int segment_len = 0;
  51         int segment_flag = 0;
  52         uint8_t stamp_len = 0;
  53         int crc = 0;
  54         int wrp = 0;
  55         int wrc = 0;
  56         uint8_t data_buf[1200]; // receiver buffer,  should be 1024..
  57         char token_type[4];
  58
  59         // copy data from proxmark into buffer
  60         GetFromBigBuf(data_buf,sizeof(data_buf),0);
  61         WaitForResponse(CMD_ACK,NULL);
  62
  63         // Output CDF System area (9 bytes) plus remaining header area (12 bytes)
  64         crc = data_buf[4];
  65         uint32_t calc_crc =  CRC8Legic(data_buf, 4);
  66
  67         PrintAndLog("\nCDF: System Area");
  68
  69         PrintAndLog("MCD: %02x, MSN: %02x %02x %02x, MCC: %02x %s",
  70                 data_buf[0],
  71                 data_buf[1],
  72                 data_buf[2],
  73                 data_buf[3],
  74                 data_buf[4],
  75                 (calc_crc == crc) ? "OK":"Fail"
  76         );
  77
  78         switch (data_buf[5] & 0x7f) {
  79                 case 0x00 ... 0x2f:
  80                         strncpy(token_type, "IAM",sizeof(token_type));
  81                         break;
  82                 case 0x30 ... 0x6f:
  83                         strncpy(token_type, "SAM",sizeof(token_type));
  84                         break;
  85                 case 0x70 ... 0x7f:
  86                         strncpy(token_type, "GAM",sizeof(token_type));
  87                         break;
  88                 default:
  89                         strncpy(token_type, "???",sizeof(token_type));
  90                         break;
  91         }
  92
  93         stamp_len = 0xfc - data_buf[6];
  94
  95         PrintAndLog("DCF: %02x %02x, Token Type=%s (OLE=%01u), Stamp len=%02u",
  96                 data_buf[5],
  97                 data_buf[6],
  98                 token_type,
  99                 (data_buf[5]&0x80)>>7,
 100                 stamp_len
 101         );
 102
 103         PrintAndLog("WRP=%02u, WRC=%01u, RD=%01u, raw=%02x, SSC=%02x",
 104                 data_buf[7]&0x0f,
 105                 (data_buf[7]&0x70)>>4,
 106                 (data_buf[7]&0x80)>>7,
 107                 data_buf[7],
 108                 data_buf[8]
 109         );
 110
 111         PrintAndLog("Remaining Header Area");
 112         PrintAndLog("%s", sprint_hex(data_buf+9, 13));
 113
 114         uint8_t segCrcBytes[8] = {0x00};
 115         uint32_t segCalcCRC = 0;
 116         uint32_t segCRC = 0;
 117
 118         PrintAndLog("\nADF: User Area");
 119         printf("-------------------------------------\n");
 120         i = 22;
 121         // 64 potential segements
 122         for ( segmentNum=0; segmentNum<64; segmentNum++ ) {
 123                 segment_len = ((data_buf[i+1]^crc)&0x0f) * 256 + (data_buf[i]^crc);
 124                 segment_flag = ((data_buf[i+1]^crc)&0xf0)>>4;
 125
 126                 wrp = (data_buf[i+2]^crc);
 127                 wrc = ((data_buf[i+3]^crc)&0x70)>>4;
 128
 129                 bool hasWRC = (wrc > 0);
 130                 bool hasWRP = (wrp > wrc);
 131                 int wrp_len = (wrp - wrc);
 132                 int remain_seg_payload_len = (segment_len - wrp - 5);
 133
 134                 // validate segment-crc
 135                 segCrcBytes[0]=data_buf[0];                     //uid0
 136                 segCrcBytes[1]=data_buf[1];                     //uid1
 137                 segCrcBytes[2]=data_buf[2];                     //uid2
 138                 segCrcBytes[3]=data_buf[3];                     //uid3
 139                 segCrcBytes[4]=(data_buf[i]^crc);       //hdr0
 140                 segCrcBytes[5]=(data_buf[i+1]^crc); //hdr1
 141                 segCrcBytes[6]=(data_buf[i+2]^crc); //hdr2
 142                 segCrcBytes[7]=(data_buf[i+3]^crc); //hdr3
 143
 144                 segCalcCRC = CRC8Legic(segCrcBytes, 8);
 145                 segCRC = data_buf[i+4]^crc;
 146
 147                 PrintAndLog("Segment %02u \nraw header=0x%02X 0x%02X 0x%02X 0x%02X \nSegment len: %u,  Flag: 0x%X (valid:%01u, last:%01u), WRP: %02u, WRC: %02u, RD: %01u, CRC: 0x%02X (%s)",
 148                         segmentNum,
 149                         data_buf[i]^crc,
 150                         data_buf[i+1]^crc,
 151                         data_buf[i+2]^crc,
 152                         data_buf[i+3]^crc,
 153                         segment_len,
 154                         segment_flag,
 155                         (segment_flag & 0x4) >> 2,
 156                         (segment_flag & 0x8) >> 3,
 157                         wrp,
 158                         wrc,
 159                         ((data_buf[i+3]^crc) & 0x80) >> 7,
 160                         segCRC,
 161                         ( segCRC == segCalcCRC ) ? "OK" : "fail"
 162                 );
 163
 164                 i += 5;
 165
 166                 if ( hasWRC ) {
 167                         PrintAndLog("WRC protected area:   (I %d | K %d| WRC %d)", i, k, wrc);
 168
 169                         // de-xor?  if not zero, assume it needs xoring.
 170                         if ( data_buf[i] > 0) {
 171                                 for ( k=i; k < wrc; ++k)
 172                                         data_buf[k] ^= crc;
 173                         }
 174                         print_hex_break( data_buf+i, wrc, 16);
 175
 176                         i += wrc;
 177                 }
 178
 179                 if ( hasWRP ) {
 180                         PrintAndLog("Remaining write protected area:  (I %d | K %d | WRC %d | WRP %d  WRP_LEN %d)",i, k, wrc, wrp, wrp_len);
 181
 182                         // de-xor?  if not zero, assume it needs xoring.
 183                         if ( data_buf[i] > 0) {
 184                                 for (k=i; k < wrp_len; ++k)
 185                                         data_buf[k] ^= crc;
 186                         }
 187
 188                         print_hex_break( data_buf+i, wrp_len, 16);
 189
 190                         i += wrp_len;
 191
 192                         // does this one work?
 193                         if( wrp_len == 8 )
 194                                 PrintAndLog("Card ID: %2X%02X%02X", data_buf[i-4]^crc, data_buf[i-3]^crc, data_buf[i-2]^crc);
 195                 }
 196
 197                 PrintAndLog("Remaining segment payload:  (I %d | K %d | Remain LEN %d)", i, k, remain_seg_payload_len);
 198
 199                 if ( data_buf[i] > 0 ) {
 200                         for ( k=i; k < remain_seg_payload_len; ++k)
 201                                 data_buf[k] ^= crc;
 202                 }
 203
 204                 print_hex_break( data_buf+i, remain_seg_payload_len, 16);
 205
 206                 i += remain_seg_payload_len;
 207
 208                 printf("\n-------------------------------------\n");
 209
 210                 // end with last segment
 211                 if (segment_flag & 0x8) return 0;
 212
 213         } // end for loop
 214         return 0;
 215 }
 216
 217 int CmdLegicRFRead(const char *Cmd) {
 218         int byte_count=0, offset=0;
 219         sscanf(Cmd, "%i %i", &offset, &byte_count);
 220         if(byte_count == 0) byte_count = -1;
 221         if(byte_count + offset > 1024) byte_count = 1024 - offset;
 222
 223         UsbCommand c= {CMD_READER_LEGIC_RF, {offset, byte_count, 0}};
 224         clearCommandBuffer();
 225         SendCommand(&c);
 226         return 0;
 227 }
 228
 229 int CmdLegicLoad(const char *Cmd) {
 230
 231         char cmdp = param_getchar(Cmd, 0);
 232         if ( cmdp == 'H' || cmdp == 'h' || cmdp == 0x00) return usage_legic_load();
 233
 234         char filename[FILE_PATH_SIZE] = {0x00};
 235         int len = strlen(Cmd);
 236
 237         if (len > FILE_PATH_SIZE) {
 238                 PrintAndLog("Filepath too long (was %s bytes), max allowed is %s ", len, FILE_PATH_SIZE);
 239                 return 0;
 240         }
 241         memcpy(filename, Cmd, len);
 242
 243     FILE *f = fopen(filename, "r");
 244     if(!f) {
 245         PrintAndLog("couldn't open '%s'", Cmd);
 246         return -1;
 247     }
 248
 249     char line[80];
 250         int offset = 0;
 251         uint8_t data[USB_CMD_DATA_SIZE] = {0x00};
 252         int index = 0;
 253         int totalbytes = 0;
 254     while ( fgets(line, sizeof(line), f) ) {
 255         int res = sscanf(line, "%x %x %x %x %x %x %x %x",
 256             (unsigned int *)&data[index],
 257                         (unsigned int *)&data[index + 1],
 258                         (unsigned int *)&data[index + 2],
 259                         (unsigned int *)&data[index + 3],
 260             (unsigned int *)&data[index + 4],
 261                         (unsigned int *)&data[index + 5],
 262                         (unsigned int *)&data[index + 6],
 263                         (unsigned int *)&data[index + 7]);
 264
 265         if(res != 8) {
 266           PrintAndLog("Error: could not read samples");
 267           fclose(f);
 268           return -1;
 269         }
 270                 index += res;
 271
 272                 if ( index == USB_CMD_DATA_SIZE ){
 273 //                      PrintAndLog("sent %d | %d | %d", index, offset, totalbytes);
 274                         UsbCommand c = { CMD_DOWNLOADED_SIM_SAMPLES_125K, {offset, 0, 0}};
 275                         memcpy(c.d.asBytes, data, sizeof(data));
 276                         clearCommandBuffer();
 277                         SendCommand(&c);
 278                         if ( !WaitForResponseTimeout(CMD_ACK, NULL, 1500)){
 279                                 PrintAndLog("Command execute timeout");
 280                                 fclose(f);
 281                                 return 1;
 282                         }
 283                         offset += index;
 284                         totalbytes += index;
 285                         index = 0;
 286                 }
 287     }
 288     fclose(f);
 289
 290         // left over bytes?
 291         if ( index != 0 ) {
 292                 UsbCommand c = { CMD_DOWNLOADED_SIM_SAMPLES_125K, {offset, 0, 0}};
 293                 memcpy(c.d.asBytes, data, 8);
 294                 clearCommandBuffer();
 295                 SendCommand(&c);
 296                 if ( !WaitForResponseTimeout(CMD_ACK, NULL, 1500)){
 297                                 PrintAndLog("Command execute timeout");
 298                                 return 1;
 299                 }
 300                 totalbytes += index;
 301         }
 302
 303     PrintAndLog("loaded %u samples", totalbytes);
 304     return 0;
 305 }
 306
 307 int CmdLegicSave(const char *Cmd) {
 308         int requested = 1024;
 309         int offset = 0;
 310         int delivered = 0;
 311         char filename[FILE_PATH_SIZE];
 312         uint8_t got[1024] = {0x00};
 313
 314         sscanf(Cmd, " %s %i %i", filename, &requested, &offset);
 315
 316         /* If no length given save entire legic read buffer */
 317         /* round up to nearest 8 bytes so the saved data can be used with legicload */
 318         if (requested == 0)
 319                 requested = 1024;
 320
 321         if (requested % 8 != 0) {
 322                 int remainder = requested % 8;
 323                 requested = requested + 8 - remainder;
 324         }
 325
 326         if (offset + requested > sizeof(got)) {
 327                 PrintAndLog("Tried to read past end of buffer, <bytes> + <offset> > 1024");
 328                 return 0;
 329         }
 330
 331         FILE *f = fopen(filename, "w");
 332         if(!f) {
 333                 PrintAndLog("couldn't open '%s'", Cmd+1);
 334                 return -1;
 335         }
 336
 337         GetFromBigBuf(got, requested, offset);
 338         WaitForResponse(CMD_ACK, NULL);
 339
 340         for (int j = 0; j < requested; j += 8) {
 341                 fprintf(f, "%02x %02x %02x %02x %02x %02x %02x %02x\n",
 342                         got[j+0], got[j+1], got[j+2], got[j+3],
 343                         got[j+4], got[j+5],     got[j+6], got[j+7]
 344                 );
 345                 delivered += 8;
 346                 if (delivered >= requested) break;
 347         }
 348
 349         fclose(f);
 350         PrintAndLog("saved %u samples", delivered);
 351         return 0;
 352 }
 353
 354 int CmdLegicRfSim(const char *Cmd) {
 355         UsbCommand c = {CMD_SIMULATE_TAG_LEGIC_RF, {6,3,0}};
 356         sscanf(Cmd, " %"lli" %"lli" %"lli, &c.arg[0], &c.arg[1], &c.arg[2]);
 357         clearCommandBuffer();
 358         SendCommand(&c);
 359         return 0;
 360 }
 361
 362 int CmdLegicRfWrite(const char *Cmd) {
 363     UsbCommand c = {CMD_WRITER_LEGIC_RF};
 364     int res = sscanf(Cmd, " 0x%"llx" 0x%"llx, &c.arg[0], &c.arg[1]);
 365         if(res != 2) {
 366                 PrintAndLog("Please specify the offset and length as two hex strings");
 367         return -1;
 368     }
 369         clearCommandBuffer();
 370     SendCommand(&c);
 371     return 0;
 372 }
 373
 374 int CmdLegicRfFill(const char *Cmd) {
 375     UsbCommand cmd = {CMD_WRITER_LEGIC_RF};
 376     int res = sscanf(Cmd, " 0x%"llx" 0x%"llx" 0x%"llx, &cmd.arg[0], &cmd.arg[1], &cmd.arg[2]);
 377     if(res != 3) {
 378         PrintAndLog("Please specify the offset, length and value as two hex strings");
 379         return -1;
 380     }
 381
 382     int i;
 383     UsbCommand c = {CMD_DOWNLOADED_SIM_SAMPLES_125K, {0, 0, 0}};
 384     for(i = 0; i < 48; i++) {
 385                 c.d.asBytes[i] = cmd.arg[2];
 386     }
 387
 388         for(i = 0; i < 22; i++) {
 389                 c.arg[0] = i*48;
 390                 SendCommand(&c);
 391                 WaitForResponse(CMD_ACK,NULL);
 392         }
 393         clearCommandBuffer();
 394     SendCommand(&cmd);
 395     return 0;
 396  }
 397
 398 int CmdLegicCalcCrc8(const char *Cmd){
 399
 400         int len =  strlen(Cmd);
 401         if (len & 1 ) return usage_legic_calccrc8();
 402
 403         uint8_t *data = malloc(len);
 404         if ( data == NULL ) return 1;
 405
 406         param_gethex(Cmd, 0, data, len );
 407
 408         uint32_t checksum =  CRC8Legic(data, len/2);
 409         PrintAndLog("Bytes: %s || CRC8: %X", sprint_hex(data, len/2), checksum );
 410         free(data);
 411         return 0;
 412 }
 413
 414 static command_t CommandTable[] =  {
 415         {"help",        CmdHelp,        1, "This help"},
 416         {"decode",      CmdLegicDecode, 0, "Display deobfuscated and decoded LEGIC RF tag data (use after hf legic reader)"},
 417         {"read",        CmdLegicRFRead, 0, "[offset][length] -- read bytes from a LEGIC card"},
 418         {"save",        CmdLegicSave,   0, "<filename> [<length>] -- Store samples"},
 419         {"load",        CmdLegicLoad,   0, "<filename> -- Restore samples"},
 420         {"sim",         CmdLegicRfSim,  0, "[phase drift [frame drift [req/resp drift]]] Start tag simulator (use after load or read)"},
 421         {"write",       CmdLegicRfWrite,0, "<offset> <length> -- Write sample buffer (user after load or read)"},
 422         {"fill",        CmdLegicRfFill, 0, "<offset> <length> <value> -- Fill/Write tag with constant value"},
 423         {"crc8",        CmdLegicCalcCrc8, 1, "Calculate Legic CRC8 over given hexbytes"},
 424         {NULL, NULL, 0, NULL}
 425 };
 426
 427 int CmdHFLegic(const char *Cmd) {
 428         clearCommandBuffer();
 429         CmdsParse(CommandTable, Cmd);
 430         return 0;
 431 }
 432
 433 int CmdHelp(const char *Cmd) {
 434         CmdsHelp(CommandTable);
 435         return 0;
 436 }