git.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         if ( !WaitForResponseTimeout(CMD_ACK, NULL, 2000)){
  62                 PrintAndLog("Command execute timeout");
  63                 return 1;
  64         }
  65
  66         // Output CDF System area (9 bytes) plus remaining header area (12 bytes)
  67         crc = data_buf[4];
  68         uint32_t calc_crc =  CRC8Legic(data_buf, 4);
  69
  70         PrintAndLog("\nCDF: System Area");
  71
  72         PrintAndLog("MCD: %02x, MSN: %02x %02x %02x, MCC: %02x %s",
  73                 data_buf[0],
  74                 data_buf[1],
  75                 data_buf[2],
  76                 data_buf[3],
  77                 data_buf[4],
  78                 (calc_crc == crc) ? "OK":"Fail"
  79         );
  80
  81         switch (data_buf[5] & 0x7f) {
  82                 case 0x00 ... 0x2f:
  83                         strncpy(token_type, "IAM",sizeof(token_type));
  84                         break;
  85                 case 0x30 ... 0x6f:
  86                         strncpy(token_type, "SAM",sizeof(token_type));
  87                         break;
  88                 case 0x70 ... 0x7f:
  89                         strncpy(token_type, "GAM",sizeof(token_type));
  90                         break;
  91                 default:
  92                         strncpy(token_type, "???",sizeof(token_type));
  93                         break;
  94         }
  95
  96         stamp_len = 0xfc - data_buf[6];
  97
  98         PrintAndLog("DCF: %02x %02x, Token Type=%s (OLE=%01u), Stamp len=%02u",
  99                 data_buf[5],
 100                 data_buf[6],
 101                 token_type,
 102                 (data_buf[5]&0x80)>>7,
 103                 stamp_len
 104         );
 105
 106         PrintAndLog("WRP=%02u, WRC=%01u, RD=%01u, raw=%02x, SSC=%02x",
 107                 data_buf[7]&0x0f,
 108                 (data_buf[7]&0x70)>>4,
 109                 (data_buf[7]&0x80)>>7,
 110                 data_buf[7],
 111                 data_buf[8]
 112         );
 113
 114         PrintAndLog("Remaining Header Area");
 115         PrintAndLog("%s", sprint_hex(data_buf+9, 13));
 116
 117         uint8_t segCrcBytes[8] = {0x00};
 118         uint32_t segCalcCRC = 0;
 119         uint32_t segCRC = 0;
 120
 121         PrintAndLog("\nADF: User Area");
 122         printf("-------------------------------------\n");
 123         i = 22;
 124         // 64 potential segements
 125         // how to detect there is no segments?!?
 126         for ( segmentNum=0; segmentNum<64; segmentNum++ ) {
 127                 segment_len = ((data_buf[i+1]^crc)&0x0f) * 256 + (data_buf[i]^crc);
 128                 segment_flag = ((data_buf[i+1]^crc)&0xf0)>>4;
 129
 130                 wrp = (data_buf[i+2]^crc);
 131                 wrc = ((data_buf[i+3]^crc)&0x70)>>4;
 132
 133                 bool hasWRC = (wrc > 0);
 134                 bool hasWRP = (wrp > wrc);
 135                 int wrp_len = (wrp - wrc);
 136                 int remain_seg_payload_len = (segment_len - wrp - 5);
 137
 138                 // validate segment-crc
 139                 segCrcBytes[0]=data_buf[0];                     //uid0
 140                 segCrcBytes[1]=data_buf[1];                     //uid1
 141                 segCrcBytes[2]=data_buf[2];                     //uid2
 142                 segCrcBytes[3]=data_buf[3];                     //uid3
 143                 segCrcBytes[4]=(data_buf[i]^crc);       //hdr0
 144                 segCrcBytes[5]=(data_buf[i+1]^crc); //hdr1
 145                 segCrcBytes[6]=(data_buf[i+2]^crc); //hdr2
 146                 segCrcBytes[7]=(data_buf[i+3]^crc); //hdr3
 147
 148                 segCalcCRC = CRC8Legic(segCrcBytes, 8);
 149                 segCRC = data_buf[i+4]^crc;
 150
 151                 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)",
 152                         segmentNum,
 153                         data_buf[i]^crc,
 154                         data_buf[i+1]^crc,
 155                         data_buf[i+2]^crc,
 156                         data_buf[i+3]^crc,
 157                         segment_len,
 158                         segment_flag,
 159                         (segment_flag & 0x4) >> 2,
 160                         (segment_flag & 0x8) >> 3,
 161                         wrp,
 162                         wrc,
 163                         ((data_buf[i+3]^crc) & 0x80) >> 7,
 164                         segCRC,
 165                         ( segCRC == segCalcCRC ) ? "OK" : "fail"
 166                 );
 167
 168                 i += 5;
 169
 170                 if ( hasWRC ) {
 171                         PrintAndLog("WRC protected area:   (I %d | K %d| WRC %d)", i, k, wrc);
 172
 173                         // de-xor?  if not zero, assume it needs xoring.
 174                         if ( data_buf[i] > 0) {
 175                                 for ( k=i; k < wrc; ++k)
 176                                         data_buf[k] ^= crc;
 177                         }
 178                         print_hex_break( data_buf+i, wrc, 16);
 179
 180                         i += wrc;
 181                 }
 182
 183                 if ( hasWRP ) {
 184                         PrintAndLog("Remaining write protected area:  (I %d | K %d | WRC %d | WRP %d  WRP_LEN %d)",i, k, wrc, wrp, wrp_len);
 185
 186                         // de-xor?  if not zero, assume it needs xoring.
 187                         if ( data_buf[i] > 0) {
 188                                 for (k=i; k < wrp_len; ++k)
 189                                         data_buf[k] ^= crc;
 190                         }
 191
 192                         print_hex_break( data_buf+i, wrp_len, 16);
 193
 194                         i += wrp_len;
 195
 196                         // does this one work?
 197                         if( wrp_len == 8 )
 198                                 PrintAndLog("Card ID: %2X%02X%02X", data_buf[i-4]^crc, data_buf[i-3]^crc, data_buf[i-2]^crc);
 199                 }
 200
 201                 PrintAndLog("Remaining segment payload:  (I %d | K %d | Remain LEN %d)", i, k, remain_seg_payload_len);
 202
 203                 if ( data_buf[i] > 0 ) {
 204                         for ( k=i; k < remain_seg_payload_len; ++k)
 205                                 data_buf[k] ^= crc;
 206                 }
 207
 208                 print_hex_break( data_buf+i, remain_seg_payload_len, 16);
 209
 210                 i += remain_seg_payload_len;
 211
 212                 printf("\n-------------------------------------\n");
 213
 214                 // end with last segment
 215                 if (segment_flag & 0x8) return 0;
 216
 217         } // end for loop
 218         return 0;
 219 }
 220
 221 int CmdLegicRFRead(const char *Cmd) {
 222         int byte_count=0, offset=0;
 223         sscanf(Cmd, "%i %i", &offset, &byte_count);
 224         if(byte_count == 0) byte_count = -1;
 225         if(byte_count + offset > 1024) byte_count = 1024 - offset;
 226
 227         UsbCommand c= {CMD_READER_LEGIC_RF, {offset, byte_count, 0}};
 228         clearCommandBuffer();
 229         SendCommand(&c);
 230         return 0;
 231 }
 232
 233 int CmdLegicLoad(const char *Cmd) {
 234
 235         char cmdp = param_getchar(Cmd, 0);
 236         if ( cmdp == 'H' || cmdp == 'h' || cmdp == 0x00) return usage_legic_load();
 237
 238         char filename[FILE_PATH_SIZE] = {0x00};
 239         int len = strlen(Cmd);
 240
 241         if (len > FILE_PATH_SIZE) {
 242                 PrintAndLog("Filepath too long (was %s bytes), max allowed is %s ", len, FILE_PATH_SIZE);
 243                 return 0;
 244         }
 245         memcpy(filename, Cmd, len);
 246
 247     FILE *f = fopen(filename, "r");
 248     if(!f) {
 249         PrintAndLog("couldn't open '%s'", Cmd);
 250         return -1;
 251     }
 252
 253     char line[80];
 254         int offset = 0;
 255         uint8_t data[USB_CMD_DATA_SIZE] = {0x00};
 256         int index = 0;
 257         int totalbytes = 0;
 258     while ( fgets(line, sizeof(line), f) ) {
 259         int res = sscanf(line, "%x %x %x %x %x %x %x %x",
 260             (unsigned int *)&data[index],
 261                         (unsigned int *)&data[index + 1],
 262                         (unsigned int *)&data[index + 2],
 263                         (unsigned int *)&data[index + 3],
 264             (unsigned int *)&data[index + 4],
 265                         (unsigned int *)&data[index + 5],
 266                         (unsigned int *)&data[index + 6],
 267                         (unsigned int *)&data[index + 7]);
 268
 269         if(res != 8) {
 270           PrintAndLog("Error: could not read samples");
 271           fclose(f);
 272           return -1;
 273         }
 274                 index += res;
 275
 276                 if ( index == USB_CMD_DATA_SIZE ){
 277 //                      PrintAndLog("sent %d | %d | %d", index, offset, totalbytes);
 278                         UsbCommand c = { CMD_DOWNLOADED_SIM_SAMPLES_125K, {offset, 0, 0}};
 279                         memcpy(c.d.asBytes, data, sizeof(data));
 280                         clearCommandBuffer();
 281                         SendCommand(&c);
 282                         if ( !WaitForResponseTimeout(CMD_ACK, NULL, 1500)){
 283                                 PrintAndLog("Command execute timeout");
 284                                 fclose(f);
 285                                 return 1;
 286                         }
 287                         offset += index;
 288                         totalbytes += index;
 289                         index = 0;
 290                 }
 291     }
 292     fclose(f);
 293
 294         // left over bytes?
 295         if ( index != 0 ) {
 296                 UsbCommand c = { CMD_DOWNLOADED_SIM_SAMPLES_125K, {offset, 0, 0}};
 297                 memcpy(c.d.asBytes, data, 8);
 298                 clearCommandBuffer();
 299                 SendCommand(&c);
 300                 if ( !WaitForResponseTimeout(CMD_ACK, NULL, 1500)){
 301                                 PrintAndLog("Command execute timeout");
 302                                 return 1;
 303                 }
 304                 totalbytes += index;
 305         }
 306
 307     PrintAndLog("loaded %u samples", totalbytes);
 308     return 0;
 309 }
 310
 311 int CmdLegicSave(const char *Cmd) {
 312         int requested = 1024;
 313         int offset = 0;
 314         int delivered = 0;
 315         char filename[FILE_PATH_SIZE];
 316         uint8_t got[1024] = {0x00};
 317
 318         sscanf(Cmd, " %s %i %i", filename, &requested, &offset);
 319
 320         /* If no length given save entire legic read buffer */
 321         /* round up to nearest 8 bytes so the saved data can be used with legicload */
 322         if (requested == 0)
 323                 requested = 1024;
 324
 325         if (requested % 8 != 0) {
 326                 int remainder = requested % 8;
 327                 requested = requested + 8 - remainder;
 328         }
 329
 330         if (offset + requested > sizeof(got)) {
 331                 PrintAndLog("Tried to read past end of buffer, <bytes> + <offset> > 1024");
 332                 return 0;
 333         }
 334
 335         FILE *f = fopen(filename, "w");
 336         if(!f) {
 337                 PrintAndLog("couldn't open '%s'", Cmd+1);
 338                 return -1;
 339         }
 340
 341         GetFromBigBuf(got, requested, offset);
 342         if ( !WaitForResponseTimeout(CMD_ACK, NULL, 2000)){
 343                 PrintAndLog("Command execute timeout");
 344                 return 1;
 345         }
 346
 347         for (int j = 0; j < requested; j += 8) {
 348                 fprintf(f, "%02x %02x %02x %02x %02x %02x %02x %02x\n",
 349                         got[j+0], got[j+1], got[j+2], got[j+3],
 350                         got[j+4], got[j+5],     got[j+6], got[j+7]
 351                 );
 352                 delivered += 8;
 353                 if (delivered >= requested) break;
 354         }
 355
 356         fclose(f);
 357         PrintAndLog("saved %u samples", delivered);
 358         return 0;
 359 }
 360
 361 //TODO: write a help text (iceman)
 362 int CmdLegicRfSim(const char *Cmd) {
 363         UsbCommand c = {CMD_SIMULATE_TAG_LEGIC_RF, {6,3,0}};
 364         sscanf(Cmd, " %"lli" %"lli" %"lli, &c.arg[0], &c.arg[1], &c.arg[2]);
 365         clearCommandBuffer();
 366         SendCommand(&c);
 367         return 0;
 368 }
 369
 370 //TODO: write a help text (iceman)
 371 int CmdLegicRfWrite(const char *Cmd) {
 372     UsbCommand c = {CMD_WRITER_LEGIC_RF};
 373     int res = sscanf(Cmd, " 0x%"llx" 0x%"llx, &c.arg[0], &c.arg[1]);
 374         if(res != 2) {
 375                 PrintAndLog("Please specify the offset and length as two hex strings");
 376         return -1;
 377     }
 378         clearCommandBuffer();
 379     SendCommand(&c);
 380     return 0;
 381 }
 382
 383 int CmdLegicRfFill(const char *Cmd) {
 384     UsbCommand cmd = {CMD_WRITER_LEGIC_RF};
 385     int res = sscanf(Cmd, " 0x%"llx" 0x%"llx" 0x%"llx, &cmd.arg[0], &cmd.arg[1], &cmd.arg[2]);
 386     if(res != 3) {
 387         PrintAndLog("Please specify the offset, length and value as two hex strings");
 388         return -1;
 389     }
 390
 391     int i;
 392     UsbCommand c = {CMD_DOWNLOADED_SIM_SAMPLES_125K, {0, 0, 0}};
 393     for(i = 0; i < 48; i++) {
 394                 c.d.asBytes[i] = cmd.arg[2];
 395     }
 396
 397         for(i = 0; i < 22; i++) {
 398                 c.arg[0] = i*48;
 399                 SendCommand(&c);
 400                 WaitForResponse(CMD_ACK,NULL);
 401         }
 402         clearCommandBuffer();
 403     SendCommand(&cmd);
 404     return 0;
 405  }
 406
 407 int CmdLegicCalcCrc8(const char *Cmd){
 408
 409         int len =  strlen(Cmd);
 410         if (len & 1 ) return usage_legic_calccrc8();
 411
 412         uint8_t *data = malloc(len);
 413         if ( data == NULL ) return 1;
 414
 415         param_gethex(Cmd, 0, data, len );
 416
 417         uint32_t checksum =  CRC8Legic(data, len/2);
 418         PrintAndLog("Bytes: %s || CRC8: %X", sprint_hex(data, len/2), checksum );
 419         free(data);
 420         return 0;
 421 }
 422
 423 static command_t CommandTable[] =  {
 424         {"help",        CmdHelp,        1, "This help"},
 425         {"decode",      CmdLegicDecode, 0, "Display deobfuscated and decoded LEGIC RF tag data (use after hf legic reader)"},
 426         {"read",        CmdLegicRFRead, 0, "[offset][length] -- read bytes from a LEGIC card"},
 427         {"save",        CmdLegicSave,   0, "<filename> [<length>] -- Store samples"},
 428         {"load",        CmdLegicLoad,   0, "<filename> -- Restore samples"},
 429         {"sim",         CmdLegicRfSim,  0, "[phase drift [frame drift [req/resp drift]]] Start tag simulator (use after load or read)"},
 430         {"write",       CmdLegicRfWrite,0, "<offset> <length> -- Write sample buffer (user after load or read)"},
 431         {"fill",        CmdLegicRfFill, 0, "<offset> <length> <value> -- Fill/Write tag with constant value"},
 432         {"crc8",        CmdLegicCalcCrc8, 1, "Calculate Legic CRC8 over given hexbytes"},
 433         {NULL, NULL, 0, NULL}
 434 };
 435
 436 int CmdHFLegic(const char *Cmd) {
 437         clearCommandBuffer();
 438         CmdsParse(CommandTable, Cmd);
 439         return 0;
 440 }
 441
 442 int CmdHelp(const char *Cmd) {
 443         CmdsHelp(CommandTable);
 444         return 0;
 445 }