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 /*
  35  *  Output BigBuf and deobfuscate LEGIC RF tag data.
  36  *   This is based on information given in the talk held
  37  *  by Henryk Ploetz and Karsten Nohl at 26c3
  38  */
  39 int CmdLegicDecode(const char *Cmd) {
  40         int i, k, n;
  41         int segment_len = 0;
  42         int segment_flag = 0;
  43         int stamp_len = 0;
  44         int crc = 0;
  45         int wrp = 0;
  46         int wrc = 0;
  47         uint8_t data_buf[1200]; // receiver buffer
  48         //char out_string[3076]; // just use big buffer - bad practice
  49         char token_type[4];
  50
  51         // copy data from proxmark into buffer
  52         GetFromBigBuf(data_buf,sizeof(data_buf),0);
  53         WaitForResponse(CMD_ACK,NULL);
  54
  55         // Output CDF System area (9 bytes) plus remaining header area (12 bytes)
  56         crc = data_buf[4];
  57         uint32_t calc_crc =  CRC8Legic(data_buf, 4);
  58
  59         PrintAndLog("\nCDF: System Area");
  60
  61         PrintAndLog("MCD: %02x, MSN: %02x %02x %02x, MCC: %02x %s",
  62                 data_buf[0],
  63                 data_buf[1],
  64                 data_buf[2],
  65                 data_buf[3],
  66                 data_buf[4],
  67                 (calc_crc == crc) ? "OK":"Failed"
  68         );
  69
  70         switch (data_buf[5]&0x7f) {
  71                 case 0x00 ... 0x2f:
  72                         strncpy(token_type, "IAM",sizeof(token_type));
  73                         break;
  74                 case 0x30 ... 0x6f:
  75                         strcpy(token_type, "SAM");
  76                         break;
  77                 case 0x70 ... 0x7f:
  78                         strcpy(token_type, "GAM");
  79                         break;
  80                 default:
  81                         strcpy(token_type, "???");
  82                         break;
  83         }
  84
  85         stamp_len = 0xfc - data_buf[6];
  86
  87         PrintAndLog("DCF: %02x %02x, Token_Type=%s (OLE=%01u), Stamp_len=%02u",
  88                 data_buf[5],
  89                 data_buf[6],
  90                 token_type,
  91                 (data_buf[5]&0x80)>>7,
  92                 stamp_len
  93         );
  94
  95         PrintAndLog("WRP=%02u, WRC=%01u, RD=%01u, raw=%02x, SSC=%02x",
  96                 data_buf[7]&0x0f,
  97                 (data_buf[7]&0x70)>>4,
  98                 (data_buf[7]&0x80)>>7,
  99                 data_buf[7],
 100                 data_buf[8]
 101         );
 102
 103         PrintAndLog("Remaining Header Area");
 104         PrintAndLog("%s", sprint_hex(data_buf+9, 13));
 105         PrintAndLog("\nADF: User Area");
 106
 107         i = 22;
 108         for ( n=0; n<64; n++ ) {
 109                 segment_len = ((data_buf[i+1]^crc)&0x0f) * 256 + (data_buf[i]^crc);
 110                 segment_flag = ((data_buf[i+1]^crc)&0xf0)>>4;
 111
 112                 wrp = (data_buf[i+2]^crc);
 113                 wrc = ((data_buf[i+3]^crc)&0x70)>>4;
 114
 115                 PrintAndLog("Segment %02u: raw header=%02x %02x %02x %02x, flag=%01x (valid=%01u, last=%01u), len=%04u, WRP=%02u, WRC=%02u, RD=%01u, CRC=%02x",
 116                         n,
 117                         data_buf[i]^crc,
 118                         data_buf[i+1]^crc,
 119                         data_buf[i+2]^crc,
 120                         data_buf[i+3]^crc,
 121                         segment_flag,
 122                         (segment_flag&0x4)>>2,
 123                         (segment_flag&0x8)>>3,
 124                         segment_len,
 125                         wrp,
 126                         wrc,
 127                         ((data_buf[i+3]^crc)&0x80)>>7,
 128                         (data_buf[i+4]^crc)
 129                 );
 130
 131                 i += 5;
 132
 133                 if ( wrc>0 ) {
 134                         PrintAndLog("WRC protected area:");
 135
 136                         for ( k=i; k < wrc; k++)
 137                                 data_buf[k] ^= crc;
 138
 139                         for ( k=i; k < wrc; k += 8)
 140                                 PrintAndLog("%s", sprint_hex( data_buf+k, 8)  );
 141
 142                         i += wrc;
 143                 }
 144
 145                 if ( wrp>wrc ) {
 146                         PrintAndLog("Remaining write protected area:");
 147
 148                         if ( data_buf[k] > 0) {
 149                                 for (k=i; k < (wrp-wrc); k++)
 150                                         data_buf[k] ^= crc;
 151                         }
 152
 153                         for (k=i; k < (wrp-wrc); k++)
 154                                 PrintAndLog("%s", sprint_hex( data_buf+k, 16)  );
 155
 156                         i += (wrp-wrc);
 157
 158                         if( (wrp-wrc) == 8 )
 159                                 PrintAndLog("Card ID: %2X%02X%02X", data_buf[i-4]^crc, data_buf[i-3]^crc, data_buf[i-2]^crc);
 160                 }
 161
 162                 PrintAndLog("Remaining segment payload:");
 163
 164                 if ( data_buf[k] > 0 ) {
 165                         for ( k=i; k < (segment_len - wrp - 5); k++)
 166                                 data_buf[k] ^= crc;
 167                 }
 168
 169                 for ( k=i; k < (segment_len - wrp - 5); k++)
 170                         PrintAndLog("%s", sprint_hex( data_buf+k, 16)  );
 171
 172                 // end with last segment
 173                 if (segment_flag & 0x8) return 0;
 174
 175         } // end for loop
 176         return 0;
 177 }
 178
 179 int CmdLegicRFRead(const char *Cmd) {
 180         int byte_count=0, offset=0;
 181         sscanf(Cmd, "%i %i", &offset, &byte_count);
 182         if(byte_count == 0) byte_count = -1;
 183         if(byte_count + offset > 1024) byte_count = 1024 - offset;
 184
 185         UsbCommand c= {CMD_READER_LEGIC_RF, {offset, byte_count, 0}};
 186         clearCommandBuffer();
 187         SendCommand(&c);
 188         return 0;
 189 }
 190
 191 int CmdLegicLoad(const char *Cmd) {
 192         char filename[FILE_PATH_SIZE] = {0x00};
 193         int len = 0;
 194
 195         char cmdp = param_getchar(Cmd, 0);
 196         if ( cmdp == 'H' || cmdp == 'h' || cmdp == 0x00) {
 197                 PrintAndLog("It loads datasamples from the file `filename` to device memory");
 198                 PrintAndLog("Usage:  hf legic load <file name>");
 199                 PrintAndLog(" sample: hf legic load filename");
 200                 return 0;
 201         }
 202
 203         len = strlen(Cmd);
 204         if (len > FILE_PATH_SIZE) {
 205                 PrintAndLog("Filepath too long (was %s bytes), max allowed is %s ", len, FILE_PATH_SIZE);
 206                 return 0;
 207         }
 208         memcpy(filename, Cmd, len);
 209
 210     FILE *f = fopen(filename, "r");
 211     if(!f) {
 212         PrintAndLog("couldn't open '%s'", Cmd);
 213         return -1;
 214     }
 215
 216     char line[80];
 217         int offset = 0;
 218         uint32_t data[8] = {0x00};
 219
 220     while ( fgets(line, sizeof(line), f) ) {
 221         int res = sscanf(line, "%x %x %x %x %x %x %x %x",
 222             &data[0], &data[1], &data[2], &data[3],
 223             &data[4], &data[5], &data[6], &data[7]);
 224
 225         if(res != 8) {
 226           PrintAndLog("Error: could not read samples");
 227           fclose(f);
 228           return -1;
 229         }
 230
 231         UsbCommand c = { CMD_DOWNLOADED_SIM_SAMPLES_125K, {offset, 0, 0}};
 232                 memcpy(c.d.asBytes, data, 8);
 233                 clearCommandBuffer();
 234         SendCommand(&c);
 235         WaitForResponse(CMD_ACK, NULL);
 236         offset += 8;
 237     }
 238     fclose(f);
 239     PrintAndLog("loaded %u samples", offset);
 240     return 0;
 241 }
 242
 243 int CmdLegicSave(const char *Cmd) {
 244         int requested = 1024;
 245         int offset = 0;
 246         int delivered = 0;
 247         char filename[FILE_PATH_SIZE];
 248         uint8_t got[1024] = {0x00};
 249
 250         sscanf(Cmd, " %s %i %i", filename, &requested, &offset);
 251
 252         /* If no length given save entire legic read buffer */
 253         /* round up to nearest 8 bytes so the saved data can be used with legicload */
 254         if (requested == 0)
 255                 requested = 1024;
 256
 257         if (requested % 8 != 0) {
 258                 int remainder = requested % 8;
 259                 requested = requested + 8 - remainder;
 260         }
 261
 262         if (offset + requested > sizeof(got)) {
 263                 PrintAndLog("Tried to read past end of buffer, <bytes> + <offset> > 1024");
 264                 return 0;
 265         }
 266
 267         FILE *f = fopen(filename, "w");
 268         if(!f) {
 269                 PrintAndLog("couldn't open '%s'", Cmd+1);
 270                 return -1;
 271         }
 272
 273         GetFromBigBuf(got,requested,offset);
 274         WaitForResponse(CMD_ACK,NULL);
 275
 276         for (int j = 0; j < requested; j += 8) {
 277                 fprintf(f, "%02x %02x %02x %02x %02x %02x %02x %02x\n",
 278                         got[j+0],
 279                         got[j+1],
 280                         got[j+2],
 281                         got[j+3],
 282                         got[j+4],
 283                         got[j+5],
 284                         got[j+6],
 285                         got[j+7]
 286                 );
 287                 delivered += 8;
 288                 if (delivered >= requested) break;
 289         }
 290
 291         fclose(f);
 292         PrintAndLog("saved %u samples", delivered);
 293         return 0;
 294 }
 295
 296 int CmdLegicRfSim(const char *Cmd) {
 297         UsbCommand c = {CMD_SIMULATE_TAG_LEGIC_RF, {6,3,0}};
 298         sscanf(Cmd, " %"lli" %"lli" %"lli, &c.arg[0], &c.arg[1], &c.arg[2]);
 299         clearCommandBuffer();
 300         SendCommand(&c);
 301         return 0;
 302 }
 303
 304 int CmdLegicRfWrite(const char *Cmd) {
 305     UsbCommand c = {CMD_WRITER_LEGIC_RF};
 306     int res = sscanf(Cmd, " 0x%"llx" 0x%"llx, &c.arg[0], &c.arg[1]);
 307         if(res != 2) {
 308                 PrintAndLog("Please specify the offset and length as two hex strings");
 309         return -1;
 310     }
 311         clearCommandBuffer();
 312     SendCommand(&c);
 313     return 0;
 314 }
 315
 316 int CmdLegicRfFill(const char *Cmd) {
 317     UsbCommand cmd = {CMD_WRITER_LEGIC_RF};
 318     int res = sscanf(Cmd, " 0x%"llx" 0x%"llx" 0x%"llx, &cmd.arg[0], &cmd.arg[1], &cmd.arg[2]);
 319     if(res != 3) {
 320         PrintAndLog("Please specify the offset, length and value as two hex strings");
 321         return -1;
 322     }
 323
 324     int i;
 325     UsbCommand c = {CMD_DOWNLOADED_SIM_SAMPLES_125K, {0, 0, 0}};
 326     for(i = 0; i < 48; i++) {
 327                 c.d.asBytes[i] = cmd.arg[2];
 328     }
 329
 330         for(i = 0; i < 22; i++) {
 331                 c.arg[0] = i*48;
 332                 SendCommand(&c);
 333                 WaitForResponse(CMD_ACK,NULL);
 334         }
 335         clearCommandBuffer();
 336     SendCommand(&cmd);
 337     return 0;
 338  }
 339
 340
 341 int CmdLegicCalcCrc8(const char *Cmd){
 342
 343         int len =  strlen(Cmd);
 344         if (len & 1 ) return usage_legic_calccrc8();
 345
 346         uint8_t *data = malloc(len);
 347         if ( data == NULL ) return 1;
 348
 349         param_gethex(Cmd, 0, data, len );
 350
 351         uint32_t checksum =  CRC8Legic(data, len/2);
 352         PrintAndLog("Bytes: %s || CRC8: %X", sprint_hex(data, len/2), checksum );
 353         free(data);
 354         return 0;
 355 }
 356
 357 static command_t CommandTable[] =  {
 358         {"help",        CmdHelp,        1, "This help"},
 359         {"decode",      CmdLegicDecode, 0, "Display deobfuscated and decoded LEGIC RF tag data (use after hf legic reader)"},
 360         {"read",        CmdLegicRFRead, 0, "[offset][length] -- read bytes from a LEGIC card"},
 361         {"save",        CmdLegicSave,   0, "<filename> [<length>] -- Store samples"},
 362         {"load",        CmdLegicLoad,   0, "<filename> -- Restore samples"},
 363         {"sim",         CmdLegicRfSim,  0, "[phase drift [frame drift [req/resp drift]]] Start tag simulator (use after load or read)"},
 364         {"write",       CmdLegicRfWrite,0, "<offset> <length> -- Write sample buffer (user after load or read)"},
 365         {"fill",        CmdLegicRfFill, 0, "<offset> <length> <value> -- Fill/Write tag with constant value"},
 366         {"crc8",        CmdLegicCalcCrc8, 1, "Calculate Legic CRC8 over given hexbytes"},
 367         {NULL, NULL, 0, NULL}
 368 };
 369
 370 int CmdHFLegic(const char *Cmd) {
 371         clearCommandBuffer();
 372         CmdsParse(CommandTable, Cmd);
 373         return 0;
 374 }
 375
 376 int CmdHelp(const char *Cmd) {
 377         CmdsHelp(CommandTable);
 378         return 0;
 379 }