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 <inttypes.h>
  14 #include "proxmark3.h"
  15 #include "ui.h"
  16 #include "cmdparser.h"
  17 #include "cmdhflegic.h"
  18 #include "cmdmain.h"
  19 #include "util.h"
  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[1053]; // 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, NULL, -1, false);
  67
  68   // Output CDF System area (9 bytes) plus remaining header area (12 bytes)
  69
  70   PrintAndLog("\nCDF: System Area");
  71
  72   PrintAndLog("MCD: %02x, MSN: %02x %02x %02x, MCC: %02x",
  73     data_buf[0],
  74     data_buf[1],
  75     data_buf[2],
  76     data_buf[3],
  77     data_buf[4]
  78   );
  79
  80   crc = data_buf[4];
  81
  82   switch (data_buf[5]&0x7f) {
  83     case 0x00 ... 0x2f:
  84       strncpy(token_type, "IAM",sizeof(token_type));
  85       break;
  86     case 0x30 ... 0x6f:
  87       strcpy(token_type, "SAM");
  88       break;
  89     case 0x70 ... 0x7f:
  90       strcpy(token_type, "GAM");
  91       break;
  92     default:
  93       strcpy(token_type, "???");
  94       break;
  95   }
  96
  97   stamp_len = 0xfc - data_buf[6];
  98
  99   PrintAndLog("DCF: %02x %02x, Token_Type=%s (OLE=%01u), Stamp_len=%02u",
 100     data_buf[5],
 101     data_buf[6],
 102     token_type,
 103     (data_buf[5]&0x80)>>7,
 104     stamp_len
 105   );
 106
 107   PrintAndLog("WRP=%02u, WRC=%01u, RD=%01u, raw=%02x, SSC=%02x",
 108     data_buf[7]&0x0f,
 109     (data_buf[7]&0x70)>>4,
 110     (data_buf[7]&0x80)>>7,
 111     data_buf[7],
 112     data_buf[8]
 113   );
 114
 115   PrintAndLog("Remaining Header Area");
 116
 117   PrintAndLog("%02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x",
 118       data_buf[9],
 119     data_buf[10],
 120     data_buf[11],
 121     data_buf[12],
 122     data_buf[13],
 123     data_buf[14],
 124     data_buf[15],
 125     data_buf[16],
 126     data_buf[17],
 127     data_buf[18],
 128     data_buf[19],
 129     data_buf[20],
 130     data_buf[21]
 131   );
 132
 133   PrintAndLog("\nADF: User Area");
 134
 135   i = 22;
 136   for (n=0; n<64; n++) {
 137     segment_len = ((data_buf[i+1]^crc)&0x0f) * 256 + (data_buf[i]^crc);
 138     segment_flag = ((data_buf[i+1]^crc)&0xf0)>>4;
 139
 140     wrp = (data_buf[i+2]^crc);
 141     wrc = ((data_buf[i+3]^crc)&0x70)>>4;
 142
 143      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",
 144       n,
 145       data_buf[i]^crc,
 146       data_buf[i+1]^crc,
 147       data_buf[i+2]^crc,
 148       data_buf[i+3]^crc,
 149       segment_flag,
 150       (segment_flag&0x4)>>2,
 151       (segment_flag&0x8)>>3,
 152       segment_len,
 153       wrp,
 154       wrc,
 155       ((data_buf[i+3]^crc)&0x80)>>7,
 156       (data_buf[i+4]^crc)
 157     );
 158
 159     i+=5;
 160
 161     if (wrc>0) {
 162       PrintAndLog("WRC protected area:");
 163       for (k=0, j=0; k < wrc && j<(sizeof(out_string)-3); k++, i++, j += 3) {
 164         sprintf(&out_string[j], "%02x", (data_buf[i]^crc));
 165         out_string[j+2] = ' ';
 166       };
 167
 168       out_string[j] = '\0';
 169
 170       PrintAndLog("%s", out_string);
 171     }
 172
 173     if (wrp>wrc) {
 174       PrintAndLog("Remaining write protected area:");
 175
 176       for (k=0, j=0; k < (wrp-wrc) && j<(sizeof(out_string)-3); k++, i++, j += 3) {
 177         sprintf(&out_string[j], "%02x", (data_buf[i]^crc));
 178         out_string[j+2] = ' ';
 179       };
 180
 181       out_string[j] = '\0';
 182
 183       PrintAndLog("%s", out_string);
 184       if((wrp-wrc) == 8) {
 185         sprintf(out_string,"Card ID: %2X%02X%02X",data_buf[i-4]^crc,data_buf[i-3]^crc,data_buf[i-2]^crc);
 186         PrintAndLog("%s", out_string);
 187       }
 188     }
 189
 190     PrintAndLog("Remaining segment payload:");
 191     for (k=0, j=0; k < (segment_len - wrp - 5) && j<(sizeof(out_string)-3); k++, i++, j += 3) {
 192       sprintf(&out_string[j], "%02x", (data_buf[i]^crc));
 193       out_string[j+2] = ' ';
 194     };
 195
 196     out_string[j] = '\0';
 197
 198     PrintAndLog("%s", out_string);
 199
 200     // end with last segment
 201     if (segment_flag & 0x8)
 202       return 0;
 203   };
 204   return 0;
 205 }
 206
 207 int CmdLegicRFRead(const char *Cmd)
 208 {
 209   int byte_count=0,offset=0;
 210   sscanf(Cmd, "%i %i", &offset, &byte_count);
 211   if(byte_count == 0) byte_count = -1;
 212   if(byte_count + offset > 1024) byte_count = 1024 - offset;
 213   UsbCommand c={CMD_READER_LEGIC_RF, {offset, byte_count, 0}};
 214   SendCommand(&c);
 215   return 0;
 216 }
 217
 218 int CmdLegicLoad(const char *Cmd)
 219 {
 220         char filename[FILE_PATH_SIZE] = {0x00};
 221         int len = 0;
 222
 223         if (param_getchar(Cmd, 0) == 'h' || param_getchar(Cmd, 0)== 0x00) {
 224                 PrintAndLog("It loads datasamples from the file `filename`");
 225                 PrintAndLog("Usage:  hf legic load <file name>");
 226                 PrintAndLog(" sample: hf legic load filename");
 227                 return 0;
 228         }
 229
 230         len = strlen(Cmd);
 231         if (len > FILE_PATH_SIZE) {
 232                 PrintAndLog("Filepath too long (was %s bytes), max allowed is %s ", len, FILE_PATH_SIZE);
 233                 return 0;
 234         }
 235         memcpy(filename, Cmd, len);
 236
 237     FILE *f = fopen(filename, "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, 1, 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 requested = 1024;
 268   int offset = 0;
 269   int delivered = 0;
 270   char filename[FILE_PATH_SIZE];
 271   uint8_t got[1024];
 272
 273   sscanf(Cmd, " %s %i %i", filename, &requested, &offset);
 274
 275   /* If no length given save entire legic read buffer */
 276   /* round up to nearest 8 bytes so the saved data can be used with legicload */
 277   if (requested == 0) {
 278     requested = 1024;
 279   }
 280   if (requested % 8 != 0) {
 281     int remainder = requested % 8;
 282     requested = requested + 8 - remainder;
 283   }
 284   if (offset + requested > sizeof(got)) {
 285     PrintAndLog("Tried to read past end of buffer, <bytes> + <offset> > 1024");
 286     return 0;
 287   }
 288
 289   FILE *f = fopen(filename, "w");
 290   if(!f) {
 291     PrintAndLog("couldn't open '%s'", Cmd+1);
 292     return -1;
 293   }
 294
 295   GetFromBigBuf(got, requested, offset, NULL, -1, false);
 296
 297   for (int j = 0; j < requested; j += 8) {
 298     fprintf(f, "%02x %02x %02x %02x %02x %02x %02x %02x\n",
 299       got[j+0],
 300       got[j+1],
 301       got[j+2],
 302       got[j+3],
 303       got[j+4],
 304       got[j+5],
 305       got[j+6],
 306       got[j+7]
 307     );
 308     delivered += 8;
 309     if (delivered >= requested)
 310       break;
 311   }
 312
 313   fclose(f);
 314   PrintAndLog("saved %u samples", delivered);
 315   return 0;
 316 }
 317
 318 int CmdLegicRfSim(const char *Cmd)
 319 {
 320    UsbCommand c={CMD_SIMULATE_TAG_LEGIC_RF};
 321    c.arg[0] = 6;
 322    c.arg[1] = 3;
 323    c.arg[2] = 0;
 324    sscanf(Cmd, " %" SCNi64 " %" SCNi64 " %" SCNi64, &c.arg[0], &c.arg[1], &c.arg[2]);
 325    SendCommand(&c);
 326    return 0;
 327 }
 328
 329 int CmdLegicRfWrite(const char *Cmd)
 330 {
 331     UsbCommand c={CMD_WRITER_LEGIC_RF};
 332     int res = sscanf(Cmd, " 0x%" SCNx64 " 0x%" SCNx64, &c.arg[0], &c.arg[1]);
 333         if(res != 2) {
 334                 PrintAndLog("Please specify the offset and length as two hex strings");
 335         return -1;
 336     }
 337     SendCommand(&c);
 338     return 0;
 339 }
 340
 341 int CmdLegicRfFill(const char *Cmd)
 342 {
 343     UsbCommand cmd ={CMD_WRITER_LEGIC_RF};
 344     int res = sscanf(Cmd, " 0x%" SCNx64 " 0x%" SCNx64 " 0x%" SCNx64, &cmd.arg[0], &cmd.arg[1], &cmd.arg[2]);
 345     if(res != 3) {
 346         PrintAndLog("Please specify the offset, length and value as two hex strings");
 347         return -1;
 348     }
 349
 350     int i;
 351     UsbCommand c={CMD_DOWNLOADED_SIM_SAMPLES_125K, {0, 1, 0}};
 352     for(i = 0; i < 48; i++) {
 353       c.d.asBytes[i] = cmd.arg[2];
 354     }
 355     for(i = 0; i < 22; i++) {
 356       c.arg[0] = i*48;
 357       SendCommand(&c);
 358       WaitForResponse(CMD_ACK,NULL);
 359     }
 360     SendCommand(&cmd);
 361     return 0;
 362  }
 363