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 "proxusb.h"
  14 #include "proxmark3.h"
  15 #include "data.h"
  16 #include "ui.h"
  17 #include "cmdparser.h"
  18 #include "cmdhflegic.h"
  19 #include "cmdmain.h"
  20
  21 static int CmdHelp(const char *Cmd);
  22
  23 static command_t CommandTable[] =
  24 {
  25   {"help",        CmdHelp,        1, "This help"},
  26   {"decode",      CmdLegicDecode, 0, "Display deobfuscated and decoded LEGIC RF tag data (use after hf legic reader)"},
  27   {"reader",      CmdLegicRFRead, 0, "[offset [length]] -- read bytes from a LEGIC card"},
  28   {"save",        CmdLegicSave,   0, "<filename> [<length>] -- Store samples"},
  29   {"load",        CmdLegicLoad,   0, "<filename> -- Restore samples"},
  30   {"sim",         CmdLegicRfSim,  0, "[phase drift [frame drift [req/resp drift]]] Start tag simulator (use after load or read)"},
  31   {"write",       CmdLegicRfWrite,0, "<offset> <length> -- Write sample buffer (user after load or read)"},
  32   {"fill",        CmdLegicRfFill, 0, "<offset> <length> <value> -- Fill/Write tag with constant value"},
  33   {NULL, NULL, 0, NULL}
  34 };
  35
  36 int CmdHFLegic(const char *Cmd)
  37 {
  38   CmdsParse(CommandTable, Cmd);
  39   return 0;
  40 }
  41
  42 int CmdHelp(const char *Cmd)
  43 {
  44   CmdsHelp(CommandTable);
  45   return 0;
  46 }
  47
  48 /*
  49  *  Output BigBuf and deobfuscate LEGIC RF tag data.
  50  *   This is based on information given in the talk held
  51  *  by Henryk Ploetz and Karsten Nohl at 26c3
  52  */
  53 int CmdLegicDecode(const char *Cmd)
  54 {
  55   int h, i, j, k, n;
  56   int segment_len = 0;
  57   int segment_flag = 0;
  58   int stamp_len = 0;
  59   int crc = 0;
  60   int wrp = 0;
  61   int wrc = 0;
  62   int data_buf[1032]; // receiver buffer
  63   char out_string[3076]; // just use big buffer - bad practice
  64   char token_type[4];
  65   int delivered = 0;
  66
  67   h = 0;
  68
  69   // copy data from proxmark into buffer
  70   for (i = 0; i < 256; i += 12, h += 48) {
  71     UsbCommand c = {CMD_DOWNLOAD_RAW_ADC_SAMPLES_125K, {i, 0, 0}};
  72     SendCommand(&c);
  73     WaitForResponse(CMD_DOWNLOADED_RAW_ADC_SAMPLES_125K, NULL);
  74
  75     for (j = 0; j < 48; j += 8) {
  76       for (k = 0; k < 8; k++) {
  77         data_buf[h+j+k] = sample_buf[j+k];
  78       }
  79       delivered += 8;
  80       if (delivered >= 1024)
  81         break;
  82     }
  83   }
  84
  85   // Output CDF System area (9 bytes) plus remaining header area (12 bytes)
  86
  87   PrintAndLog("\nCDF: System Area");
  88
  89   PrintAndLog("MCD: %02x, MSN: %02x %02x %02x, MCC: %02x",
  90     data_buf[0],
  91     data_buf[1],
  92     data_buf[2],
  93     data_buf[3],
  94     data_buf[4]
  95   );
  96
  97   crc = data_buf[4];
  98
  99   switch (data_buf[5]&0x7f) {
 100     case 0x00 ... 0x2f:
 101       strncpy(token_type, "IAM",sizeof(token_type));
 102       break;
 103     case 0x30 ... 0x6f:
 104       strcpy(token_type, "SAM");
 105       break;
 106     case 0x70 ... 0x7f:
 107       strcpy(token_type, "GAM");
 108       break;
 109     default:
 110       strcpy(token_type, "???");
 111       break;
 112   }
 113
 114   stamp_len = 0xfc - data_buf[6];
 115
 116   PrintAndLog("DCF: %02x %02x, Token_Type=%s (OLE=%01u), Stamp_len=%02u",
 117     data_buf[5],
 118     data_buf[6],
 119     token_type,
 120     (data_buf[5]&0x80)>>7,
 121     stamp_len
 122   );
 123
 124   PrintAndLog("WRP=%02u, WRC=%01u, RD=%01u, raw=%02x, SSC=%02x",
 125     data_buf[7]&0x0f,
 126     (data_buf[7]&0x70)>>4,
 127     (data_buf[7]&0x80)>>7,
 128     data_buf[7],
 129     data_buf[8]
 130   );
 131
 132   PrintAndLog("Remaining Header Area");
 133
 134   PrintAndLog("%02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x",
 135       data_buf[9],
 136     data_buf[10],
 137     data_buf[11],
 138     data_buf[12],
 139     data_buf[13],
 140     data_buf[14],
 141     data_buf[15],
 142     data_buf[16],
 143     data_buf[17],
 144     data_buf[18],
 145     data_buf[19],
 146     data_buf[20],
 147     data_buf[21]
 148   );
 149
 150   PrintAndLog("\nADF: User Area");
 151
 152   i = 22;
 153   for (n=0; n<64; n++) {
 154     segment_len = ((data_buf[i+1]^crc)&0x0f) * 256 + (data_buf[i]^crc);
 155     segment_flag = ((data_buf[i+1]^crc)&0xf0)>>4;
 156
 157     wrp = (data_buf[i+2]^crc);
 158     wrc = ((data_buf[i+3]^crc)&0x70)>>4;
 159
 160      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",
 161       n,
 162       data_buf[i]^crc,
 163       data_buf[i+1]^crc,
 164       data_buf[i+2]^crc,
 165       data_buf[i+3]^crc,
 166       segment_flag,
 167       (segment_flag&0x4)>>2,
 168       (segment_flag&0x8)>>3,
 169       segment_len,
 170       wrp,
 171       wrc,
 172       ((data_buf[i+3]^crc)&0x80)>>7,
 173       (data_buf[i+4]^crc)
 174     );
 175
 176     i+=5;
 177
 178     if (wrc>0) {
 179       PrintAndLog("WRC protected area:");
 180       for (k=0, j=0; k < wrc && j<(sizeof(out_string)-3); k++, i++, j += 3) {
 181         sprintf(&out_string[j], "%02x", (data_buf[i]^crc));
 182         out_string[j+2] = ' ';
 183       };
 184
 185       out_string[j] = '\0';
 186
 187       PrintAndLog("%s", out_string);
 188     }
 189
 190     if (wrp>wrc) {
 191       PrintAndLog("Remaining write protected area:");
 192
 193       for (k=0, j=0; k < (wrp-wrc) && j<(sizeof(out_string)-3); k++, i++, j += 3) {
 194         sprintf(&out_string[j], "%02x", (data_buf[i]^crc));
 195         out_string[j+2] = ' ';
 196       };
 197
 198       out_string[j] = '\0';
 199
 200       PrintAndLog("%s", out_string);
 201       if((wrp-wrc) == 8) {
 202         sprintf(out_string,"Card ID: %2X%02X%02X",data_buf[i-4]^crc,data_buf[i-3]^crc,data_buf[i-2]^crc);
 203         PrintAndLog("%s", out_string);
 204       }
 205     }
 206
 207     PrintAndLog("Remaining segment payload:");
 208     for (k=0, j=0; k < (segment_len - wrp - 5) && j<(sizeof(out_string)-3); k++, i++, j += 3) {
 209       sprintf(&out_string[j], "%02x", (data_buf[i]^crc));
 210       out_string[j+2] = ' ';
 211     };
 212
 213     out_string[j] = '\0';
 214
 215     PrintAndLog("%s", out_string);
 216
 217     // end with last segment
 218     if (segment_flag & 0x8)
 219       return 0;
 220   };
 221   return 0;
 222 }
 223
 224 int CmdLegicRFRead(const char *Cmd)
 225 {
 226   int byte_count=0,offset=0;
 227   sscanf(Cmd, "%i %i", &offset, &byte_count);
 228   if(byte_count == 0) byte_count = -1;
 229   if(byte_count + offset > 1024) byte_count = 1024 - offset;
 230   UsbCommand c={CMD_READER_LEGIC_RF, {offset, byte_count, 0}};
 231   SendCommand(&c);
 232   return 0;
 233 }
 234
 235 int CmdLegicLoad(const char *Cmd)
 236 {
 237     FILE *f = fopen(Cmd, "r");
 238     if(!f) {
 239         PrintAndLog("couldn't open '%s'", Cmd);
 240         return -1;
 241     }
 242     char line[80]; int offset = 0; unsigned int data[8];
 243     while(fgets(line, sizeof(line), f)) {
 244         int res = sscanf(line, "%x %x %x %x %x %x %x %x",
 245             &data[0], &data[1], &data[2], &data[3],
 246             &data[4], &data[5], &data[6], &data[7]);
 247         if(res != 8) {
 248           PrintAndLog("Error: could not read samples");
 249           fclose(f);
 250           return -1;
 251         }
 252         UsbCommand c={CMD_DOWNLOADED_SIM_SAMPLES_125K, {offset, 0, 0}};
 253         int j; for(j = 0; j < 8; j++) {
 254             c.d.asBytes[j] = data[j];
 255         }
 256         SendCommand(&c);
 257         WaitForResponse(CMD_ACK, NULL);
 258         offset += 8;
 259     }
 260     fclose(f);
 261     PrintAndLog("loaded %u samples", offset);
 262     return 0;
 263 }
 264
 265 int CmdLegicSave(const char *Cmd)
 266 {
 267   int n;
 268   int requested = 1024;
 269   int offset = 0;
 270   char filename[1024];
 271   sscanf(Cmd, " %s %i %i", filename, &requested, &offset);
 272   if (offset % 4 != 0) {
 273     PrintAndLog("Offset must be a multiple of 4");
 274     return 0;
 275   }
 276   offset = offset/4;
 277
 278   int delivered = 0;
 279
 280   if (requested == 0) {
 281     n = 12;
 282     requested = 12;
 283   } else {
 284     n = requested/4;
 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   for (int i = offset; i < n+offset; i += 12) {
 294     UsbCommand c = {CMD_DOWNLOAD_RAW_ADC_SAMPLES_125K, {i, 0, 0}};
 295     SendCommand(&c);
 296     WaitForResponse(CMD_DOWNLOADED_RAW_ADC_SAMPLES_125K, NULL);
 297     for (int j = 0; j < 48; j += 8) {
 298       fprintf(f, "%02x %02x %02x %02x %02x %02x %02x %02x\n",
 299         sample_buf[j+0],
 300         sample_buf[j+1],
 301         sample_buf[j+2],
 302         sample_buf[j+3],
 303         sample_buf[j+4],
 304         sample_buf[j+5],
 305         sample_buf[j+6],
 306         sample_buf[j+7]
 307       );
 308       delivered += 8;
 309       if (delivered >= requested)
 310         break;
 311     }
 312     if (delivered >= requested)
 313       break;
 314   }
 315
 316   fclose(f);
 317   PrintAndLog("saved %u samples", delivered);
 318   return 0;
 319 }
 320
 321 int CmdLegicRfSim(const char *Cmd)
 322 {
 323    UsbCommand c={CMD_SIMULATE_TAG_LEGIC_RF};
 324    c.arg[0] = 6;
 325    c.arg[1] = 3;
 326    c.arg[2] = 0;
 327    sscanf(Cmd, " %i %i %i", &c.arg[0], &c.arg[1], &c.arg[2]);
 328    SendCommand(&c);
 329    return 0;
 330 }
 331
 332 int CmdLegicRfWrite(const char *Cmd)
 333 {
 334     UsbCommand c={CMD_WRITER_LEGIC_RF};
 335     int res = sscanf(Cmd, " 0x%x 0x%x", &c.arg[0], &c.arg[1]);
 336         if(res != 2) {
 337                 PrintAndLog("Please specify the offset and length as two hex strings");
 338         return -1;
 339     }
 340     SendCommand(&c);
 341     return 0;
 342 }
 343
 344 int CmdLegicRfFill(const char *Cmd)
 345 {
 346     UsbCommand cmd ={CMD_WRITER_LEGIC_RF};
 347     int res = sscanf(Cmd, " 0x%x 0x%x 0x%x", &cmd.arg[0], &cmd.arg[1], &cmd.arg[2]);
 348     if(res != 3) {
 349         PrintAndLog("Please specify the offset, length and value as two hex strings");
 350         return -1;
 351     }
 352
 353     int i;
 354     UsbCommand c={CMD_DOWNLOADED_SIM_SAMPLES_125K, {0, 0, 0}};
 355     for(i = 0; i < 48; i++) {
 356       c.d.asBytes[i] = cmd.arg[2];
 357     }
 358     for(i = 0; i < 22; i++) {
 359       c.arg[0] = i*48;
 360       SendCommand(&c);
 361       WaitForResponse(CMD_ACK,NULL);
 362     }
 363     SendCommand(&cmd);
 364     return 0;
 365  }
 366