git.zerfleddert.de Git - proxmark3-svn/blob - client/cmdhflegic.c

   1 #include <stdio.h>
   2 #include <string.h>
   3 #include "proxusb.h"
   4 #include "data.h"
   5 #include "ui.h"
   6 #include "cmdparser.h"
   7 #include "cmdhflegic.h"
   8 #include "cmdmain.h"
   9
  10 static int CmdHelp(const char *Cmd);
  11
  12 static command_t CommandTable[] =
  13 {
  14   {"help",        CmdHelp,        1, "This help"},
  15   {"decode",      CmdLegicDecode, 0, "Display deobfuscated and decoded LEGIC RF tag data (use after hf legic reader)"},
  16   {"reader",      CmdLegicRFRead, 0, "[offset [length]] -- read bytes from a LEGIC card"},
  17   {NULL, NULL, 0, NULL}
  18 };
  19
  20 int CmdHFLegic(const char *Cmd)
  21 {
  22   CmdsParse(CommandTable, Cmd);
  23   return 0;
  24 }
  25
  26 int CmdHelp(const char *Cmd)
  27 {
  28   CmdsHelp(CommandTable);
  29   return 0;
  30 }
  31
  32 /*
  33  *  Output BigBuf and deobfuscate LEGIC RF tag data.
  34  *   This is based on information given in the talk held
  35  *  by Henryk Ploetz and Karsten Nohl at 26c3
  36  */
  37 int CmdLegicDecode(const char *Cmd)
  38 {
  39   int h, i, j, k, n;
  40   int segment_len = 0;
  41   int segment_flag = 0;
  42   int stamp_len = 0;
  43   int crc = 0;
  44   int wrp = 0;
  45   int wrc = 0;
  46   int data_buf[1032]; // receiver buffer
  47   char out_string[3076]; // just use big buffer - bad practice
  48   char token_type[4];
  49   int delivered = 0;
  50
  51   h = 0;
  52
  53   // copy data from proxmark into buffer
  54   for (i = 0; i < 256; i += 12, h += 48) {
  55     UsbCommand c = {CMD_DOWNLOAD_RAW_ADC_SAMPLES_125K, {i, 0, 0}};
  56     SendCommand(&c);
  57     WaitForResponse(CMD_DOWNLOADED_RAW_ADC_SAMPLES_125K);
  58
  59     for (j = 0; j < 48; j += 8) {
  60       for (k = 0; k < 8; k++) {
  61         data_buf[h+j+k] = sample_buf[j+k];
  62       }
  63       delivered += 8;
  64       if (delivered >= 1024)
  65         break;
  66     }
  67   }
  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 }