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
  20 static int CmdHelp(const char *Cmd);
  21
  22 static command_t CommandTable[] =
  23 {
  24   {"help",        CmdHelp,        1, "This help"},
  25   {"decode",      CmdLegicDecode, 0, "Display deobfuscated and decoded LEGIC RF tag data (use after hf legic reader)"},
  26   {"reader",      CmdLegicRFRead, 0, "[offset [length]] -- read bytes from a LEGIC card"},
  27   {"save",        CmdLegicSave,   0, "<filename> [<length>] -- Store samples"},
  28   {"load",        CmdLegicLoad,   0, "<filename> -- Restore samples"},
  29   {"sim",         CmdLegicRfSim,  0, "[phase drift [frame drift [req/resp drift]]] Start tag simulator (use after load or read)"},
  30   {"write",       CmdLegicRfWrite,0, "<offset> <length> -- Write sample buffer (user after load or read)"},
  31   {"fill",        CmdLegicRfFill, 0, "<offset> <length> <value> -- Fill/Write tag with constant value"},
  32   {NULL, NULL, 0, NULL}
  33 };
  34
  35 int CmdHFLegic(const char *Cmd)
  36 {
  37   CmdsParse(CommandTable, Cmd);
  38   return 0;
  39 }
  40
  41 int CmdHelp(const char *Cmd)
  42 {
  43   CmdsHelp(CommandTable);
  44   return 0;
  45 }
  46
  47 /*
  48  *  Output BigBuf and deobfuscate LEGIC RF tag data.
  49  *   This is based on information given in the talk held
  50  *  by Henryk Ploetz and Karsten Nohl at 26c3
  51  */
  52 int CmdLegicDecode(const char *Cmd)
  53 {
  54   int i, j, k, n;
  55   int segment_len = 0;
  56   int segment_flag = 0;
  57   int stamp_len = 0;
  58   int crc = 0;
  59   int wrp = 0;
  60   int wrc = 0;
  61   uint8_t data_buf[1024]; // receiver buffer
  62   char out_string[3076]; // just use big buffer - bad practice
  63   char token_type[4];
  64
  65   // copy data from proxmark into buffer
  66    GetFromBigBuf(data_buf,sizeof(data_buf),0);
  67    WaitForResponse(CMD_ACK,NULL);
  68
  69   // Output CDF System area (9 bytes) plus remaining header area (12 bytes)
  70
  71   PrintAndLog("\nCDF: System Area");
  72
  73   PrintAndLog("MCD: %02x, MSN: %02x %02x %02x, MCC: %02x",
  74     data_buf[0],
  75     data_buf[1],
  76     data_buf[2],
  77     data_buf[3],
  78     data_buf[4]
  79   );
  80
  81   crc = data_buf[4];
  82
  83   switch (data_buf[5]&0x7f) {
  84     case 0x00 ... 0x2f:
  85       strncpy(token_type, "IAM",sizeof(token_type));
  86       break;
  87     case 0x30 ... 0x6f:
  88       strcpy(token_type, "SAM");
  89       break;
  90     case 0x70 ... 0x7f:
  91       strcpy(token_type, "GAM");
  92       break;
  93     default:
  94       strcpy(token_type, "???");
  95       break;
  96   }
  97
  98   stamp_len = 0xfc - data_buf[6];
  99
 100   PrintAndLog("DCF: %02x %02x, Token_Type=%s (OLE=%01u), Stamp_len=%02u",
 101     data_buf[5],
 102     data_buf[6],
 103     token_type,
 104     (data_buf[5]&0x80)>>7,
 105     stamp_len
 106   );
 107
 108   PrintAndLog("WRP=%02u, WRC=%01u, RD=%01u, raw=%02x, SSC=%02x",
 109     data_buf[7]&0x0f,
 110     (data_buf[7]&0x70)>>4,
 111     (data_buf[7]&0x80)>>7,
 112     data_buf[7],
 113     data_buf[8]
 114   );
 115
 116   PrintAndLog("Remaining Header Area");
 117
 118   PrintAndLog("%02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x",
 119       data_buf[9],
 120     data_buf[10],
 121     data_buf[11],
 122     data_buf[12],
 123     data_buf[13],
 124     data_buf[14],
 125     data_buf[15],
 126     data_buf[16],
 127     data_buf[17],
 128     data_buf[18],
 129     data_buf[19],
 130     data_buf[20],
 131     data_buf[21]
 132   );
 133
 134   PrintAndLog("\nADF: User Area");
 135
 136   i = 22;
 137   for (n=0; n<64; n++) {
 138     segment_len = ((data_buf[i+1]^crc)&0x0f) * 256 + (data_buf[i]^crc);
 139     segment_flag = ((data_buf[i+1]^crc)&0xf0)>>4;
 140
 141     wrp = (data_buf[i+2]^crc);
 142     wrc = ((data_buf[i+3]^crc)&0x70)>>4;
 143
 144      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",
 145       n,
 146       data_buf[i]^crc,
 147       data_buf[i+1]^crc,
 148       data_buf[i+2]^crc,
 149       data_buf[i+3]^crc,
 150       segment_flag,
 151       (segment_flag&0x4)>>2,
 152       (segment_flag&0x8)>>3,
 153       segment_len,
 154       wrp,
 155       wrc,
 156       ((data_buf[i+3]^crc)&0x80)>>7,
 157       (data_buf[i+4]^crc)
 158     );
 159
 160     i+=5;
 161
 162     if (wrc>0) {
 163       PrintAndLog("WRC protected area:");
 164       for (k=0, j=0; k < wrc && j<(sizeof(out_string)-3); k++, i++, j += 3) {
 165         sprintf(&out_string[j], "%02x", (data_buf[i]^crc));
 166         out_string[j+2] = ' ';
 167       };
 168
 169       out_string[j] = '\0';
 170
 171       PrintAndLog("%s", out_string);
 172     }
 173
 174     if (wrp>wrc) {
 175       PrintAndLog("Remaining write protected area:");
 176
 177       for (k=0, j=0; k < (wrp-wrc) && j<(sizeof(out_string)-3); k++, i++, j += 3) {
 178         sprintf(&out_string[j], "%02x", (data_buf[i]^crc));
 179         out_string[j+2] = ' ';
 180       };
 181
 182       out_string[j] = '\0';
 183
 184       PrintAndLog("%s", out_string);
 185       if((wrp-wrc) == 8) {
 186         sprintf(out_string,"Card ID: %2X%02X%02X",data_buf[i-4]^crc,data_buf[i-3]^crc,data_buf[i-2]^crc);
 187         PrintAndLog("%s", out_string);
 188       }
 189     }
 190
 191     PrintAndLog("Remaining segment payload:");
 192     for (k=0, j=0; k < (segment_len - wrp - 5) && j<(sizeof(out_string)-3); k++, i++, j += 3) {
 193       sprintf(&out_string[j], "%02x", (data_buf[i]^crc));
 194       out_string[j+2] = ' ';
 195     };
 196
 197     out_string[j] = '\0';
 198
 199     PrintAndLog("%s", out_string);
 200
 201     // end with last segment
 202     if (segment_flag & 0x8)
 203       return 0;
 204   };
 205   return 0;
 206 }
 207
 208 int CmdLegicRFRead(const char *Cmd)
 209 {
 210   int byte_count=0,offset=0;
 211   sscanf(Cmd, "%i %i", &offset, &byte_count);
 212   if(byte_count == 0) byte_count = -1;
 213   if(byte_count + offset > 1024) byte_count = 1024 - offset;
 214   UsbCommand c={CMD_READER_LEGIC_RF, {offset, byte_count, 0}};
 215   SendCommand(&c);
 216   return 0;
 217 }
 218
 219 int CmdLegicLoad(const char *Cmd)
 220 {
 221     FILE *f = fopen(Cmd, "r");
 222     if(!f) {
 223         PrintAndLog("couldn't open '%s'", Cmd);
 224         return -1;
 225     }
 226     char line[80]; int offset = 0; unsigned int data[8];
 227     while(fgets(line, sizeof(line), f)) {
 228         int res = sscanf(line, "%x %x %x %x %x %x %x %x",
 229             &data[0], &data[1], &data[2], &data[3],
 230             &data[4], &data[5], &data[6], &data[7]);
 231         if(res != 8) {
 232           PrintAndLog("Error: could not read samples");
 233           fclose(f);
 234           return -1;
 235         }
 236         UsbCommand c={CMD_DOWNLOADED_SIM_SAMPLES_125K, {offset, 0, 0}};
 237         int j; for(j = 0; j < 8; j++) {
 238             c.d.asBytes[j] = data[j];
 239         }
 240         SendCommand(&c);
 241         WaitForResponse(CMD_ACK, NULL);
 242         offset += 8;
 243     }
 244     fclose(f);
 245     PrintAndLog("loaded %u samples", offset);
 246     return 0;
 247 }
 248
 249 int CmdLegicSave(const char *Cmd)
 250 {
 251   int requested = 1024;
 252   int offset = 0;
 253   int delivered = 0;
 254   char filename[1024];
 255   uint8_t got[1024];
 256
 257   sscanf(Cmd, " %s %i %i", filename, &requested, &offset);
 258
 259   /* If no length given save entire legic read buffer */
 260   /* round up to nearest 8 bytes so the saved data can be used with legicload */
 261   if (requested == 0) {
 262     requested = 1024;
 263   }
 264   if (requested % 8 != 0) {
 265     int remainder = requested % 8;
 266     requested = requested + 8 - remainder;
 267   }
 268   if (offset + requested > sizeof(got)) {
 269     PrintAndLog("Tried to read past end of buffer, <bytes> + <offset> > 1024");
 270     return 0;
 271   }
 272
 273   FILE *f = fopen(filename, "w");
 274   if(!f) {
 275     PrintAndLog("couldn't open '%s'", Cmd+1);
 276     return -1;
 277   }
 278
 279   GetFromBigBuf(got,requested,offset);
 280   WaitForResponse(CMD_ACK,NULL);
 281
 282   for (int j = 0; j < requested; j += 8) {
 283     fprintf(f, "%02x %02x %02x %02x %02x %02x %02x %02x\n",
 284       got[j+0],
 285       got[j+1],
 286       got[j+2],
 287       got[j+3],
 288       got[j+4],
 289       got[j+5],
 290       got[j+6],
 291       got[j+7]
 292     );
 293     delivered += 8;
 294     if (delivered >= requested)
 295       break;
 296   }
 297
 298   fclose(f);
 299   PrintAndLog("saved %u samples", delivered);
 300   return 0;
 301 }
 302
 303 int CmdLegicRfSim(const char *Cmd)
 304 {
 305    UsbCommand c={CMD_SIMULATE_TAG_LEGIC_RF};
 306    c.arg[0] = 6;
 307    c.arg[1] = 3;
 308    c.arg[2] = 0;
 309    sscanf(Cmd, " %"lli" %"lli" %"lli, &c.arg[0], &c.arg[1], &c.arg[2]);
 310    SendCommand(&c);
 311    return 0;
 312 }
 313
 314 int CmdLegicRfWrite(const char *Cmd)
 315 {
 316     UsbCommand c={CMD_WRITER_LEGIC_RF};
 317     int res = sscanf(Cmd, " 0x%"llx" 0x%"llx, &c.arg[0], &c.arg[1]);
 318         if(res != 2) {
 319                 PrintAndLog("Please specify the offset and length as two hex strings");
 320         return -1;
 321     }
 322     SendCommand(&c);
 323     return 0;
 324 }
 325
 326 int CmdLegicRfFill(const char *Cmd)
 327 {
 328     UsbCommand cmd ={CMD_WRITER_LEGIC_RF};
 329     int res = sscanf(Cmd, " 0x%"llx" 0x%"llx" 0x%"llx, &cmd.arg[0], &cmd.arg[1], &cmd.arg[2]);
 330     if(res != 3) {
 331         PrintAndLog("Please specify the offset, length and value as two hex strings");
 332         return -1;
 333     }
 334
 335     int i;
 336     UsbCommand c={CMD_DOWNLOADED_SIM_SAMPLES_125K, {0, 0, 0}};
 337     for(i = 0; i < 48; i++) {
 338       c.d.asBytes[i] = cmd.arg[2];
 339     }
 340     for(i = 0; i < 22; i++) {
 341       c.arg[0] = i*48;
 342       SendCommand(&c);
 343       WaitForResponse(CMD_ACK,NULL);
 344     }
 345     SendCommand(&cmd);
 346     return 0;
 347  }
 348