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 "cmdhflegic.h"
  12
  13 #include <stdio.h>
  14 #include <string.h>
  15 #include <inttypes.h>
  16 #include "comms.h"
  17 #include "ui.h"
  18 #include "cmdparser.h"
  19 #include "cmdmain.h"
  20 #include "util.h"
  21
  22 static int CmdHelp(const char *Cmd);
  23
  24 static command_t CommandTable[] =
  25 {
  26   {"help",        CmdHelp,        1, "This help"},
  27   {"decode",      CmdLegicDecode, 0, "Display deobfuscated and decoded LEGIC RF tag data (use after hf legic reader)"},
  28   {"reader",      CmdLegicRFRead, 0, "[offset [length]] -- read bytes from a LEGIC card"},
  29   {"save",        CmdLegicSave,   0, "<filename> [<length>] -- Store samples"},
  30   {"load",        CmdLegicLoad,   0, "<filename> -- Restore samples"},
  31   {"sim",         CmdLegicRfSim,  0, "[phase drift [frame drift [req/resp drift]]] Start tag simulator (use after load or read)"},
  32   {"write",       CmdLegicRfWrite,0, "<offset> <length> -- Write sample buffer (user after load or read)"},
  33   {"fill",        CmdLegicRfFill, 0, "<offset> <length> <value> -- Fill/Write tag with constant value"},
  34   {NULL, NULL, 0, NULL}
  35 };
  36
  37 int CmdHFLegic(const char *Cmd)
  38 {
  39   CmdsParse(CommandTable, Cmd);
  40   return 0;
  41 }
  42
  43 int CmdHelp(const char *Cmd)
  44 {
  45   CmdsHelp(CommandTable);
  46   return 0;
  47 }
  48
  49 /*
  50  *  Output BigBuf and deobfuscate LEGIC RF tag data.
  51  *   This is based on information given in the talk held
  52  *  by Henryk Ploetz and Karsten Nohl at 26c3
  53  */
  54 int CmdLegicDecode(const char *Cmd)
  55 {
  56   int i, j, k, n;
  57   int segment_len = 0;
  58   int segment_flag = 0;
  59   int stamp_len = 0;
  60   int crc = 0;
  61   int wrp = 0;
  62   int wrc = 0;
  63   uint8_t data_buf[1053]; // receiver buffer
  64   char out_string[3076]; // just use big buffer - bad practice
  65   char token_type[4];
  66
  67   // copy data from proxmark into buffer
  68    GetFromBigBuf(data_buf, sizeof(data_buf), 0, NULL, -1, false);
  69
  70   // Output CDF System area (9 bytes) plus remaining header area (12 bytes)
  71
  72   PrintAndLog("\nCDF: System Area");
  73
  74   PrintAndLog("MCD: %02x, MSN: %02x %02x %02x, MCC: %02x",
  75     data_buf[0],
  76     data_buf[1],
  77     data_buf[2],
  78     data_buf[3],
  79     data_buf[4]
  80   );
  81
  82   crc = data_buf[4];
  83
  84   switch (data_buf[5]&0x7f) {
  85     case 0x00 ... 0x2f:
  86       strncpy(token_type, "IAM",sizeof(token_type));
  87       break;
  88     case 0x30 ... 0x6f:
  89       strcpy(token_type, "SAM");
  90       break;
  91     case 0x70 ... 0x7f:
  92       strcpy(token_type, "GAM");
  93       break;
  94     default:
  95       strcpy(token_type, "???");
  96       break;
  97   }
  98
  99   stamp_len = 0xfc - data_buf[6];
 100
 101   PrintAndLog("DCF: %02x %02x, Token_Type=%s (OLE=%01u), Stamp_len=%02u",
 102     data_buf[5],
 103     data_buf[6],
 104     token_type,
 105     (data_buf[5]&0x80)>>7,
 106     stamp_len
 107   );
 108
 109   PrintAndLog("WRP=%02u, WRC=%01u, RD=%01u, raw=%02x, SSC=%02x",
 110     data_buf[7]&0x0f,
 111     (data_buf[7]&0x70)>>4,
 112     (data_buf[7]&0x80)>>7,
 113     data_buf[7],
 114     data_buf[8]
 115   );
 116
 117   PrintAndLog("Remaining Header Area");
 118
 119   PrintAndLog("%02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x",
 120       data_buf[9],
 121     data_buf[10],
 122     data_buf[11],
 123     data_buf[12],
 124     data_buf[13],
 125     data_buf[14],
 126     data_buf[15],
 127     data_buf[16],
 128     data_buf[17],
 129     data_buf[18],
 130     data_buf[19],
 131     data_buf[20],
 132     data_buf[21]
 133   );
 134
 135   PrintAndLog("\nADF: User Area");
 136
 137   i = 22;
 138   for (n=0; n<64; n++) {
 139     segment_len = ((data_buf[i+1]^crc)&0x0f) * 256 + (data_buf[i]^crc);
 140     segment_flag = ((data_buf[i+1]^crc)&0xf0)>>4;
 141
 142     wrp = (data_buf[i+2]^crc);
 143     wrc = ((data_buf[i+3]^crc)&0x70)>>4;
 144
 145      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",
 146       n,
 147       data_buf[i]^crc,
 148       data_buf[i+1]^crc,
 149       data_buf[i+2]^crc,
 150       data_buf[i+3]^crc,
 151       segment_flag,
 152       (segment_flag&0x4)>>2,
 153       (segment_flag&0x8)>>3,
 154       segment_len,
 155       wrp,
 156       wrc,
 157       ((data_buf[i+3]^crc)&0x80)>>7,
 158       (data_buf[i+4]^crc)
 159     );
 160
 161     i+=5;
 162
 163     if (wrc>0) {
 164       PrintAndLog("WRC protected area:");
 165       for (k=0, j=0; k < wrc && j<(sizeof(out_string)-3); k++, i++, j += 3) {
 166         sprintf(&out_string[j], "%02x", (data_buf[i]^crc));
 167         out_string[j+2] = ' ';
 168       };
 169
 170       out_string[j] = '\0';
 171
 172       PrintAndLog("%s", out_string);
 173     }
 174
 175     if (wrp>wrc) {
 176       PrintAndLog("Remaining write protected area:");
 177
 178       for (k=0, j=0; k < (wrp-wrc) && j<(sizeof(out_string)-3); k++, i++, j += 3) {
 179         sprintf(&out_string[j], "%02x", (data_buf[i]^crc));
 180         out_string[j+2] = ' ';
 181       };
 182
 183       out_string[j] = '\0';
 184
 185       PrintAndLog("%s", out_string);
 186       if((wrp-wrc) == 8) {
 187         sprintf(out_string,"Card ID: %2X%02X%02X",data_buf[i-4]^crc,data_buf[i-3]^crc,data_buf[i-2]^crc);
 188         PrintAndLog("%s", out_string);
 189       }
 190     }
 191
 192     PrintAndLog("Remaining segment payload:");
 193     for (k=0, j=0; k < (segment_len - wrp - 5) && 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
 202     // end with last segment
 203     if (segment_flag & 0x8)
 204       return 0;
 205   };
 206   return 0;
 207 }
 208
 209 int CmdLegicRFRead(const char *Cmd)
 210 {
 211   int byte_count=0,offset=0;
 212   sscanf(Cmd, "%i %i", &offset, &byte_count);
 213   if(byte_count == 0) byte_count = -1;
 214   if(byte_count + offset > 1024) byte_count = 1024 - offset;
 215   UsbCommand c={CMD_READER_LEGIC_RF, {offset, byte_count, 0}};
 216   SendCommand(&c);
 217   return 0;
 218 }
 219
 220 int CmdLegicLoad(const char *Cmd)
 221 {
 222         char filename[FILE_PATH_SIZE] = {0x00};
 223         int len = 0;
 224
 225         if (param_getchar(Cmd, 0) == 'h' || param_getchar(Cmd, 0)== 0x00) {
 226                 PrintAndLog("It loads datasamples from the file `filename`");
 227                 PrintAndLog("Usage:  hf legic load <file name>");
 228                 PrintAndLog(" sample: hf legic load filename");
 229                 return 0;
 230         }
 231
 232         len = strlen(Cmd);
 233         if (len > FILE_PATH_SIZE) {
 234                 PrintAndLog("Filepath too long (was %s bytes), max allowed is %s ", len, FILE_PATH_SIZE);
 235                 return 0;
 236         }
 237         memcpy(filename, Cmd, len);
 238
 239     FILE *f = fopen(filename, "r");
 240     if(!f) {
 241         PrintAndLog("couldn't open '%s'", Cmd);
 242         return -1;
 243     }
 244     char line[80]; int offset = 0; unsigned int data[8];
 245     while(fgets(line, sizeof(line), f)) {
 246         int res = sscanf(line, "%x %x %x %x %x %x %x %x",
 247             &data[0], &data[1], &data[2], &data[3],
 248             &data[4], &data[5], &data[6], &data[7]);
 249         if(res != 8) {
 250           PrintAndLog("Error: could not read samples");
 251           fclose(f);
 252           return -1;
 253         }
 254         UsbCommand c={CMD_DOWNLOADED_SIM_SAMPLES_125K, {offset, 1, 0}};
 255         int j; for(j = 0; j < 8; j++) {
 256             c.d.asBytes[j] = data[j];
 257         }
 258         SendCommand(&c);
 259         WaitForResponse(CMD_ACK, NULL);
 260         offset += 8;
 261     }
 262     fclose(f);
 263     PrintAndLog("loaded %u samples", offset);
 264     return 0;
 265 }
 266
 267 int CmdLegicSave(const char *Cmd)
 268 {
 269   int requested = 1024;
 270   int offset = 0;
 271   int delivered = 0;
 272   char filename[FILE_PATH_SIZE];
 273   uint8_t got[1024];
 274
 275   sscanf(Cmd, " %s %i %i", filename, &requested, &offset);
 276
 277   /* If no length given save entire legic read buffer */
 278   /* round up to nearest 8 bytes so the saved data can be used with legicload */
 279   if (requested == 0) {
 280     requested = 1024;
 281   }
 282   if (requested % 8 != 0) {
 283     int remainder = requested % 8;
 284     requested = requested + 8 - remainder;
 285   }
 286   if (offset + requested > sizeof(got)) {
 287     PrintAndLog("Tried to read past end of buffer, <bytes> + <offset> > 1024");
 288     return 0;
 289   }
 290
 291   FILE *f = fopen(filename, "w");
 292   if(!f) {
 293     PrintAndLog("couldn't open '%s'", Cmd+1);
 294     return -1;
 295   }
 296
 297   GetFromBigBuf(got, requested, offset, NULL, -1, false);
 298
 299   for (int j = 0; j < requested; j += 8) {
 300     fprintf(f, "%02x %02x %02x %02x %02x %02x %02x %02x\n",
 301       got[j+0],
 302       got[j+1],
 303       got[j+2],
 304       got[j+3],
 305       got[j+4],
 306       got[j+5],
 307       got[j+6],
 308       got[j+7]
 309     );
 310     delivered += 8;
 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, " %" SCNi64 " %" SCNi64 " %" SCNi64, &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%" SCNx64 " 0x%" SCNx64, &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%" SCNx64 " 0x%" SCNx64 " 0x%" SCNx64, &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, 1, 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,NULL);
 361     }
 362     SendCommand(&cmd);
 363     return 0;
 364  }
 365