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         int i, k, n;
  48         int segment_len = 0;
  49         int segment_flag = 0;
  50         int stamp_len = 0;
  51         int crc = 0;
  52         int wrp = 0;
  53         int wrc = 0;
  54         uint8_t data_buf[1200]; // receiver buffer
  55         //char out_string[3076]; // just use big buffer - bad practice
  56         char token_type[4];
  57
  58         // copy data from proxmark into buffer
  59         GetFromBigBuf(data_buf,sizeof(data_buf),0);
  60         WaitForResponse(CMD_ACK,NULL);
  61
  62         // Output CDF System area (9 bytes) plus remaining header area (12 bytes)
  63         crc = data_buf[4];
  64         uint32_t calc_crc =  CRC8Legic(data_buf, 4);
  65
  66         PrintAndLog("\nCDF: System Area");
  67
  68         PrintAndLog("MCD: %02x, MSN: %02x %02x %02x, MCC: %02x %s",
  69                 data_buf[0],
  70                 data_buf[1],
  71                 data_buf[2],
  72                 data_buf[3],
  73                 data_buf[4],
  74                 (calc_crc == crc) ? "OK":"Fail"
  75         );
  76
  77         switch (data_buf[5]&0x7f) {
  78                 case 0x00 ... 0x2f:
  79                         strncpy(token_type, "IAM",sizeof(token_type));
  80                         break;
  81                 case 0x30 ... 0x6f:
  82                         strcpy(token_type, "SAM");
  83                         break;
  84                 case 0x70 ... 0x7f:
  85                         strcpy(token_type, "GAM");
  86                         break;
  87                 default:
  88                         strcpy(token_type, "???");
  89                         break;
  90         }
  91
  92         stamp_len = 0xfc - data_buf[6];
  93
  94         PrintAndLog("DCF: %02x %02x, Token_Type=%s (OLE=%01u), Stamp_len=%02u",
  95                 data_buf[5],
  96                 data_buf[6],
  97                 token_type,
  98                 (data_buf[5]&0x80)>>7,
  99                 stamp_len
 100         );
 101
 102         PrintAndLog("WRP=%02u, WRC=%01u, RD=%01u, raw=%02x, SSC=%02x",
 103                 data_buf[7]&0x0f,
 104                 (data_buf[7]&0x70)>>4,
 105                 (data_buf[7]&0x80)>>7,
 106                 data_buf[7],
 107                 data_buf[8]
 108         );
 109
 110         PrintAndLog("Remaining Header Area");
 111         PrintAndLog("%s", sprint_hex(data_buf+9, 13));
 112         PrintAndLog("\nADF: User Area");
 113
 114         i = 22;
 115         uint8_t segCrcBytes[8] = {0x00};
 116         uint32_t segCalcCRC = 0;
 117         uint32_t segCRC = 0;
 118
 119         for ( n=0; n<64; n++ ) {
 120                 segment_len = ((data_buf[i+1]^crc)&0x0f) * 256 + (data_buf[i]^crc);
 121                 segment_flag = ((data_buf[i+1]^crc)&0xf0)>>4;
 122
 123                 wrp = (data_buf[i+2]^crc);
 124                 wrc = ((data_buf[i+3]^crc)&0x70)>>4;
 125
 126                 /* validate segment-crc */
 127                 segCRC = data_buf[i+4]^crc;
 128
 129                 segCrcBytes[0]=data_buf[0]; //uid0
 130                 segCrcBytes[1]=data_buf[1]; //uid1
 131                 segCrcBytes[2]=data_buf[2]; //uid2
 132                 segCrcBytes[3]=data_buf[3]; //uid3
 133                 segCrcBytes[4]=(data_buf[i]^crc); //hdr0
 134                 segCrcBytes[5]=(data_buf[i+1]^crc); //hdr1
 135                 segCrcBytes[6]=(data_buf[i+2]^crc); //hdr2
 136                 segCrcBytes[7]=(data_buf[i+3]^crc); //hdr3
 137                 segCalcCRC = CRC8Legic(segCrcBytes, 8);
 138
 139                 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  (%s)",
 140                         n,
 141                         data_buf[i]^crc,
 142                         data_buf[i+1]^crc,
 143                         data_buf[i+2]^crc,
 144                         data_buf[i+3]^crc,
 145                         segment_flag,
 146                         (segment_flag&0x4)>>2,
 147                         (segment_flag&0x8)>>3,
 148                         segment_len,
 149                         wrp,
 150                         wrc,
 151                         ((data_buf[i+3]^crc)&0x80)>>7,
 152                         segCRC,
 153                         ( segCRC == segCalcCRC ) ? "OK" : "fail"
 154                 );
 155
 156                 i += 5;
 157
 158                 if ( wrc>0 ) {
 159                         PrintAndLog("WRC protected area:");
 160
 161                         for ( k=i; k < wrc; k++)
 162                                 data_buf[k] ^= crc;
 163
 164                         for ( k=i; k < wrc; k += 8)
 165                                 PrintAndLog("%s", sprint_hex( data_buf+k, 8)  );
 166
 167                         i += wrc;
 168                 }
 169
 170                 if ( wrp>wrc ) {
 171                         PrintAndLog("Remaining write protected area:");
 172
 173                         if ( data_buf[k] > 0) {
 174                                 for (k=i; k < (wrp-wrc); k++)
 175                                         data_buf[k] ^= crc;
 176                         }
 177
 178                         for (k=i; k < (wrp-wrc); k++)
 179                                 PrintAndLog("%s", sprint_hex( data_buf+k, 16)  );
 180
 181                         i += (wrp-wrc);
 182
 183                         if( (wrp-wrc) == 8 )
 184                                 PrintAndLog("Card ID: %2X%02X%02X", data_buf[i-4]^crc, data_buf[i-3]^crc, data_buf[i-2]^crc);
 185                 }
 186
 187                 PrintAndLog("Remaining segment payload:");
 188
 189                 if ( data_buf[k] > 0 ) {
 190                         for ( k=i; k < (segment_len - wrp - 5); k++)
 191                                 data_buf[k] ^= crc;
 192                 }
 193
 194                 for ( k=i; k < (segment_len - wrp - 5); k++)
 195                         PrintAndLog("%s", sprint_hex( data_buf+k, 16)  );
 196
 197                 // end with last segment
 198                 if (segment_flag & 0x8) return 0;
 199
 200         } // end for loop
 201         return 0;
 202 }
 203
 204 int CmdLegicRFRead(const char *Cmd) {
 205         int byte_count=0, offset=0;
 206         sscanf(Cmd, "%i %i", &offset, &byte_count);
 207         if(byte_count == 0) byte_count = -1;
 208         if(byte_count + offset > 1024) byte_count = 1024 - offset;
 209
 210         UsbCommand c= {CMD_READER_LEGIC_RF, {offset, byte_count, 0}};
 211         clearCommandBuffer();
 212         SendCommand(&c);
 213         return 0;
 214 }
 215
 216 int CmdLegicLoad(const char *Cmd) {
 217
 218         char cmdp = param_getchar(Cmd, 0);
 219         if ( cmdp == 'H' || cmdp == 'h' || cmdp == 0x00) return usage_legic_load();
 220
 221         char filename[FILE_PATH_SIZE] = {0x00};
 222         int len = strlen(Cmd);
 223
 224         if (len > FILE_PATH_SIZE) {
 225                 PrintAndLog("Filepath too long (was %s bytes), max allowed is %s ", len, FILE_PATH_SIZE);
 226                 return 0;
 227         }
 228         memcpy(filename, Cmd, len);
 229
 230     FILE *f = fopen(filename, "r");
 231     if(!f) {
 232         PrintAndLog("couldn't open '%s'", Cmd);
 233         return -1;
 234     }
 235
 236     char line[80];
 237         int offset = 0;
 238         uint8_t data[8] = {0x00};
 239
 240     while ( fgets(line, sizeof(line), f) ) {
 241         int res = sscanf(line, "%x %x %x %x %x %x %x %x",
 242             (unsigned int *)&data[0], (unsigned int *)&data[1], (unsigned int *)&data[2], (unsigned int *)&data[3],
 243             (unsigned int *)&data[4], (unsigned int *)&data[5], (unsigned int *)&data[6], (unsigned int *)&data[7]);
 244
 245         if(res != 8) {
 246           PrintAndLog("Error: could not read samples");
 247           fclose(f);
 248           return -1;
 249         }
 250
 251         UsbCommand c = { CMD_DOWNLOADED_SIM_SAMPLES_125K, {offset, 0, 0}};
 252                 memcpy(c.d.asBytes, data, 8);
 253                 clearCommandBuffer();
 254         SendCommand(&c);
 255         WaitForResponse(CMD_ACK, NULL);
 256         offset += 8;
 257     }
 258     fclose(f);
 259     PrintAndLog("loaded %u samples", offset);
 260     return 0;
 261 }
 262
 263 int CmdLegicSave(const char *Cmd) {
 264         int requested = 1024;
 265         int offset = 0;
 266         int delivered = 0;
 267         char filename[FILE_PATH_SIZE];
 268         uint8_t got[1024] = {0x00};
 269
 270         sscanf(Cmd, " %s %i %i", filename, &requested, &offset);
 271
 272         /* If no length given save entire legic read buffer */
 273         /* round up to nearest 8 bytes so the saved data can be used with legicload */
 274         if (requested == 0)
 275                 requested = 1024;
 276
 277         if (requested % 8 != 0) {
 278                 int remainder = requested % 8;
 279                 requested = requested + 8 - remainder;
 280         }
 281
 282         if (offset + requested > sizeof(got)) {
 283                 PrintAndLog("Tried to read past end of buffer, <bytes> + <offset> > 1024");
 284                 return 0;
 285         }
 286
 287         FILE *f = fopen(filename, "w");
 288         if(!f) {
 289                 PrintAndLog("couldn't open '%s'", Cmd+1);
 290                 return -1;
 291         }
 292
 293         GetFromBigBuf(got,requested,offset);
 294         WaitForResponse(CMD_ACK,NULL);
 295
 296         for (int j = 0; j < requested; j += 8) {
 297                 fprintf(f, "%02x %02x %02x %02x %02x %02x %02x %02x\n",
 298                         got[j+0],
 299                         got[j+1],
 300                         got[j+2],
 301                         got[j+3],
 302                         got[j+4],
 303                         got[j+5],
 304                         got[j+6],
 305                         got[j+7]
 306                 );
 307                 delivered += 8;
 308                 if (delivered >= requested) break;
 309         }
 310
 311         fclose(f);
 312         PrintAndLog("saved %u samples", delivered);
 313         return 0;
 314 }
 315
 316 int CmdLegicRfSim(const char *Cmd) {
 317         UsbCommand c = {CMD_SIMULATE_TAG_LEGIC_RF, {6,3,0}};
 318         sscanf(Cmd, " %"lli" %"lli" %"lli, &c.arg[0], &c.arg[1], &c.arg[2]);
 319         clearCommandBuffer();
 320         SendCommand(&c);
 321         return 0;
 322 }
 323
 324 int CmdLegicRfWrite(const char *Cmd) {
 325     UsbCommand c = {CMD_WRITER_LEGIC_RF};
 326     int res = sscanf(Cmd, " 0x%"llx" 0x%"llx, &c.arg[0], &c.arg[1]);
 327         if(res != 2) {
 328                 PrintAndLog("Please specify the offset and length as two hex strings");
 329         return -1;
 330     }
 331         clearCommandBuffer();
 332     SendCommand(&c);
 333     return 0;
 334 }
 335
 336 int CmdLegicRfFill(const char *Cmd) {
 337     UsbCommand cmd = {CMD_WRITER_LEGIC_RF};
 338     int res = sscanf(Cmd, " 0x%"llx" 0x%"llx" 0x%"llx, &cmd.arg[0], &cmd.arg[1], &cmd.arg[2]);
 339     if(res != 3) {
 340         PrintAndLog("Please specify the offset, length and value as two hex strings");
 341         return -1;
 342     }
 343
 344     int i;
 345     UsbCommand c = {CMD_DOWNLOADED_SIM_SAMPLES_125K, {0, 0, 0}};
 346     for(i = 0; i < 48; i++) {
 347                 c.d.asBytes[i] = cmd.arg[2];
 348     }
 349
 350         for(i = 0; i < 22; i++) {
 351                 c.arg[0] = i*48;
 352                 SendCommand(&c);
 353                 WaitForResponse(CMD_ACK,NULL);
 354         }
 355         clearCommandBuffer();
 356     SendCommand(&cmd);
 357     return 0;
 358  }
 359
 360 int CmdLegicCalcCrc8(const char *Cmd){
 361
 362         int len =  strlen(Cmd);
 363         if (len & 1 ) return usage_legic_calccrc8();
 364
 365         uint8_t *data = malloc(len);
 366         if ( data == NULL ) return 1;
 367
 368         param_gethex(Cmd, 0, data, len );
 369
 370         uint32_t checksum =  CRC8Legic(data, len/2);
 371         PrintAndLog("Bytes: %s || CRC8: %X", sprint_hex(data, len/2), checksum );
 372         free(data);
 373         return 0;
 374 }
 375
 376 static command_t CommandTable[] =  {
 377         {"help",        CmdHelp,        1, "This help"},
 378         {"decode",      CmdLegicDecode, 0, "Display deobfuscated and decoded LEGIC RF tag data (use after hf legic reader)"},
 379         {"read",        CmdLegicRFRead, 0, "[offset][length] -- read bytes from a LEGIC card"},
 380         {"save",        CmdLegicSave,   0, "<filename> [<length>] -- Store samples"},
 381         {"load",        CmdLegicLoad,   0, "<filename> -- Restore samples"},
 382         {"sim",         CmdLegicRfSim,  0, "[phase drift [frame drift [req/resp drift]]] Start tag simulator (use after load or read)"},
 383         {"write",       CmdLegicRfWrite,0, "<offset> <length> -- Write sample buffer (user after load or read)"},
 384         {"fill",        CmdLegicRfFill, 0, "<offset> <length> <value> -- Fill/Write tag with constant value"},
 385         {"crc8",        CmdLegicCalcCrc8, 1, "Calculate Legic CRC8 over given hexbytes"},
 386         {NULL, NULL, 0, NULL}
 387 };
 388
 389 int CmdHFLegic(const char *Cmd) {
 390         clearCommandBuffer();
 391         CmdsParse(CommandTable, Cmd);
 392         return 0;
 393 }
 394
 395 int CmdHelp(const char *Cmd) {
 396         CmdsHelp(CommandTable);
 397         return 0;
 398 }