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 "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 h, 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   int data_buf[1032]; // receiver buffer
  62   char out_string[3076]; // just use big buffer - bad practice
  63   char token_type[4];
  64   int delivered = 0;
  65
  66   h = 0;
  67
  68   // copy data from proxmark into buffer
  69   for (i = 0; i < 256; i += 12, h += 48) {
  70     UsbCommand c = {CMD_DOWNLOAD_RAW_ADC_SAMPLES_125K, {i, 0, 0}};
  71     SendCommand(&c);
  72     WaitForResponse(CMD_DOWNLOADED_RAW_ADC_SAMPLES_125K);
  73
  74     for (j = 0; j < 48; j += 8) {
  75       for (k = 0; k < 8; k++) {
  76         data_buf[h+j+k] = sample_buf[j+k];
  77       }
  78       delivered += 8;
  79       if (delivered >= 1024)
  80         break;
  81     }
  82   }
  83
  84   // Output CDF System area (9 bytes) plus remaining header area (12 bytes)
  85
  86   PrintAndLog("\nCDF: System Area");
  87
  88   PrintAndLog("MCD: %02x, MSN: %02x %02x %02x, MCC: %02x",
  89     data_buf[0],
  90     data_buf[1],
  91     data_buf[2],
  92     data_buf[3],
  93     data_buf[4]
  94   );
  95
  96   crc = data_buf[4];
  97
  98   switch (data_buf[5]&0x7f) {
  99     case 0x00 ... 0x2f:
 100       strncpy(token_type, "IAM",sizeof(token_type));
 101       break;
 102     case 0x30 ... 0x6f:
 103       strcpy(token_type, "SAM");
 104       break;
 105     case 0x70 ... 0x7f:
 106       strcpy(token_type, "GAM");
 107       break;
 108     default:
 109       strcpy(token_type, "???");
 110       break;
 111   }
 112
 113   stamp_len = 0xfc - data_buf[6];
 114
 115   PrintAndLog("DCF: %02x %02x, Token_Type=%s (OLE=%01u), Stamp_len=%02u",
 116     data_buf[5],
 117     data_buf[6],
 118     token_type,
 119     (data_buf[5]&0x80)>>7,
 120     stamp_len
 121   );
 122
 123   PrintAndLog("WRP=%02u, WRC=%01u, RD=%01u, raw=%02x, SSC=%02x",
 124     data_buf[7]&0x0f,
 125     (data_buf[7]&0x70)>>4,
 126     (data_buf[7]&0x80)>>7,
 127     data_buf[7],
 128     data_buf[8]
 129   );
 130
 131   PrintAndLog("Remaining Header Area");
 132
 133   PrintAndLog("%02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x",
 134       data_buf[9],
 135     data_buf[10],
 136     data_buf[11],
 137     data_buf[12],
 138     data_buf[13],
 139     data_buf[14],
 140     data_buf[15],
 141     data_buf[16],
 142     data_buf[17],
 143     data_buf[18],
 144     data_buf[19],
 145     data_buf[20],
 146     data_buf[21]
 147   );
 148
 149   PrintAndLog("\nADF: User Area");
 150
 151   i = 22;
 152   for (n=0; n<64; n++) {
 153     segment_len = ((data_buf[i+1]^crc)&0x0f) * 256 + (data_buf[i]^crc);
 154     segment_flag = ((data_buf[i+1]^crc)&0xf0)>>4;
 155
 156     wrp = (data_buf[i+2]^crc);
 157     wrc = ((data_buf[i+3]^crc)&0x70)>>4;
 158
 159      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",
 160       n,
 161       data_buf[i]^crc,
 162       data_buf[i+1]^crc,
 163       data_buf[i+2]^crc,
 164       data_buf[i+3]^crc,
 165       segment_flag,
 166       (segment_flag&0x4)>>2,
 167       (segment_flag&0x8)>>3,
 168       segment_len,
 169       wrp,
 170       wrc,
 171       ((data_buf[i+3]^crc)&0x80)>>7,
 172       (data_buf[i+4]^crc)
 173     );
 174
 175     i+=5;
 176
 177     if (wrc>0) {
 178       PrintAndLog("WRC protected area:");
 179       for (k=0, j=0; k < wrc && j<(sizeof(out_string)-3); k++, i++, j += 3) {
 180         sprintf(&out_string[j], "%02x", (data_buf[i]^crc));
 181         out_string[j+2] = ' ';
 182       };
 183
 184       out_string[j] = '\0';
 185
 186       PrintAndLog("%s", out_string);
 187     }
 188
 189     if (wrp>wrc) {
 190       PrintAndLog("Remaining write protected area:");
 191
 192       for (k=0, j=0; k < (wrp-wrc) && 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       if((wrp-wrc) == 8) {
 201         sprintf(out_string,"Card ID: %2X%02X%02X",data_buf[i-4]^crc,data_buf[i-3]^crc,data_buf[i-2]^crc);
 202         PrintAndLog("%s", out_string);
 203       }
 204     }
 205
 206     PrintAndLog("Remaining segment payload:");
 207     for (k=0, j=0; k < (segment_len - wrp - 5) && j<(sizeof(out_string)-3); k++, i++, j += 3) {
 208       sprintf(&out_string[j], "%02x", (data_buf[i]^crc));
 209       out_string[j+2] = ' ';
 210     };
 211
 212     out_string[j] = '\0';
 213
 214     PrintAndLog("%s", out_string);
 215
 216     // end with last segment
 217     if (segment_flag & 0x8)
 218       return 0;
 219   };
 220   return 0;
 221 }
 222
 223 int CmdLegicRFRead(const char *Cmd)
 224 {
 225   int byte_count=0,offset=0;
 226   sscanf(Cmd, "%i %i", &offset, &byte_count);
 227   if(byte_count == 0) byte_count = -1;
 228   if(byte_count + offset > 1024) byte_count = 1024 - offset;
 229   UsbCommand c={CMD_READER_LEGIC_RF, {offset, byte_count, 0}};
 230   SendCommand(&c);
 231   return 0;
 232 }
 233
 234 int CmdLegicLoad(const char *Cmd)
 235 {
 236     FILE *f = fopen(Cmd, "r");
 237     if(!f) {
 238         PrintAndLog("couldn't open '%s'", Cmd);
 239         return -1;
 240     }
 241     char line[80]; int offset = 0; unsigned int data[8];
 242     while(fgets(line, sizeof(line), f)) {
 243         int res = sscanf(line, "%x %x %x %x %x %x %x %x",
 244             &data[0], &data[1], &data[2], &data[3],
 245             &data[4], &data[5], &data[6], &data[7]);
 246         if(res != 8) {
 247           PrintAndLog("Error: could not read samples");
 248           fclose(f);
 249           return -1;
 250         }
 251         UsbCommand c={CMD_DOWNLOADED_SIM_SAMPLES_125K, {offset, 0, 0}};
 252         int j; for(j = 0; j < 8; j++) {
 253             c.d.asBytes[j] = data[j];
 254         }
 255         SendCommand(&c);
 256         WaitForResponse(CMD_ACK);
 257         offset += 8;
 258     }
 259     fclose(f);
 260     PrintAndLog("loaded %u samples", offset);
 261     return 0;
 262 }
 263
 264 int CmdLegicSave(const char *Cmd)
 265 {
 266   int n;
 267   int requested = 1024;
 268   int offset = 0;
 269   char filename[1024];
 270   sscanf(Cmd, " %s %i %i", filename, &requested, &offset);
 271   if (offset % 4 != 0) {
 272     PrintAndLog("Offset must be a multiple of 4");
 273     return 0;
 274   }
 275   offset = offset/4;
 276
 277   int delivered = 0;
 278
 279   if (requested == 0) {
 280     n = 12;
 281     requested = 12;
 282   } else {
 283     n = requested/4;
 284   }
 285
 286   FILE *f = fopen(filename, "w");
 287   if(!f) {
 288     PrintAndLog("couldn't open '%s'", Cmd+1);
 289     return -1;
 290   }
 291
 292   for (int i = offset; i < n+offset; i += 12) {
 293     UsbCommand c = {CMD_DOWNLOAD_RAW_ADC_SAMPLES_125K, {i, 0, 0}};
 294     SendCommand(&c);
 295     WaitForResponse(CMD_DOWNLOADED_RAW_ADC_SAMPLES_125K);
 296     for (int j = 0; j < 48; j += 8) {
 297       fprintf(f, "%02x %02x %02x %02x %02x %02x %02x %02x\n",
 298         sample_buf[j+0],
 299         sample_buf[j+1],
 300         sample_buf[j+2],
 301         sample_buf[j+3],
 302         sample_buf[j+4],
 303         sample_buf[j+5],
 304         sample_buf[j+6],
 305         sample_buf[j+7]
 306       );
 307       delivered += 8;
 308       if (delivered >= requested)
 309         break;
 310     }
 311     if (delivered >= requested)
 312       break;
 313   }
 314
 315   fclose(f);
 316   PrintAndLog("saved %u samples", delivered);
 317   return 0;
 318 }
 319
 320 int CmdLegicRfSim(const char *Cmd)
 321 {
 322    UsbCommand c={CMD_SIMULATE_TAG_LEGIC_RF};
 323    c.arg[0] = 6;
 324    c.arg[1] = 3;
 325    c.arg[2] = 0;
 326    sscanf(Cmd, " %i %i %i", &c.arg[0], &c.arg[1], &c.arg[2]);
 327    SendCommand(&c);
 328    return 0;
 329 }
 330
 331 int CmdLegicRfWrite(const char *Cmd)
 332 {
 333     UsbCommand c={CMD_WRITER_LEGIC_RF};
 334     int res = sscanf(Cmd, " 0x%x 0x%x", &c.arg[0], &c.arg[1]);
 335         if(res != 2) {
 336                 PrintAndLog("Please specify the offset and length as two hex strings");
 337         return -1;
 338     }
 339     SendCommand(&c);
 340     return 0;
 341 }
 342
 343 int CmdLegicRfFill(const char *Cmd)
 344 {
 345     UsbCommand cmd ={CMD_WRITER_LEGIC_RF};
 346     int res = sscanf(Cmd, " 0x%x 0x%x 0x%x", &cmd.arg[0], &cmd.arg[1], &cmd.arg[2]);
 347     if(res != 3) {
 348         PrintAndLog("Please specify the offset, length and value as two hex strings");
 349         return -1;
 350     }
 351
 352     int i;
 353     UsbCommand c={CMD_DOWNLOADED_SIM_SAMPLES_125K, {0, 0, 0}};
 354     for(i = 0; i < 48; i++) {
 355       c.d.asBytes[i] = cmd.arg[2];
 356     }
 357     for(i = 0; i < 22; i++) {
 358       c.arg[0] = i*48;
 359       SendCommand(&c);
 360       WaitForResponse(CMD_ACK);
 361     }
 362     SendCommand(&cmd);
 363     return 0;
 364  }
 365