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

   1 #include <stdio.h>
   2 #include <string.h>
   3 #include "proxusb.h"
   4 #include "cmdparser.h"
   5 #include "cmdhflegic.h"
   6 #include "cmdmain.h"
   7 #include "data.h"
   8 #include "ui.h"
   9 #include <string.h>
  10 #include <stdio.h>
  11
  12 static int CmdHelp(const char *Cmd);
  13
  14 int CmdLegicRFRead(const char *Cmd)
  15 {
  16   int byte_count=0,offset=0;
  17   sscanf(Cmd, "%i %i", &offset, &byte_count);
  18   if(byte_count == 0) byte_count = 256;
  19   if(byte_count + offset > 256) byte_count = 256 - offset;
  20   UsbCommand c={CMD_READER_LEGIC_RF, {offset, byte_count, 0}};
  21   SendCommand(&c);
  22   return 0;
  23 }
  24
  25 static command_t CommandTable[] =
  26 {
  27   {"help",        CmdHelp,        1, "This help"},
  28   {"reader",      CmdLegicRFRead, 0, "[offset [length]] -- read bytes from a LEGIC card"},
  29   {"decode",      CmdLegicDecode, 0, "Display deobfuscated and decoded LEGIC RF tag data (use after hf legic reader)"},
  30   {NULL, NULL, 0, NULL}
  31 };
  32
  33 int CmdHFLegic(const char *Cmd)
  34 {
  35   CmdsParse(CommandTable, Cmd);
  36   return 0;
  37 }
  38
  39 int CmdHelp(const char *Cmd)
  40 {
  41   CmdsHelp(CommandTable);
  42   return 0;
  43 }
  44
  45 /*
  46  *  Output BigBuf and deobfuscate LEGIC RF tag data.
  47  *   This is based on information given in the talk held
  48  *  by Henryk Ploetz and Karsten Nohl at 26c3
  49  *  FIXME: will crash if sample buffer does not contain valid legic data
  50  */
  51 int CmdLegicDecode(const char *Cmd)
  52 {
  53   int h, i, j, k, n;
  54   int segment_len = 0;
  55   int segment_flag = 0;
  56   int stamp_len = 0;
  57   int crc = 0;
  58   int wrp = 0;
  59   int wrc = 0;
  60   int data_buf[1032]; // receiver buffer
  61   char out_string[3076]; // just use big buffer - bad practice
  62   char token_type[4];
  63   int delivered = 0;
  64
  65   h = 0;
  66
  67   // copy data from proxmark into buffer
  68   for (i = 0; i < 256; i += 12, h += 48) {
  69     UsbCommand c = {CMD_DOWNLOAD_RAW_ADC_SAMPLES_125K, {i, 0, 0}};
  70     SendCommand(&c);
  71     WaitForResponse(CMD_DOWNLOADED_RAW_ADC_SAMPLES_125K);
  72
  73     for (j = 0; j < 48; j += 8) {
  74       for (k = 0; k < 8; k++) {
  75         data_buf[h+j+k] = sample_buf[j+k];
  76       }
  77       delivered += 8;
  78       if (delivered >= 1024)
  79         break;
  80     }
  81   }
  82
  83   // Output CDF System area (9 bytes) plus remaining header area (12 bytes)
  84
  85   PrintAndLog("\nCDF: System Area");
  86
  87   PrintAndLog("MCD: %02x, MSN: %02x %02x %02x, MCC: %02x",
  88     data_buf[0],
  89     data_buf[1],
  90     data_buf[2],
  91     data_buf[3],
  92     data_buf[4]
  93   );
  94
  95   crc = data_buf[4];
  96
  97   switch (data_buf[5]&0x7f) {
  98     case 0x00 ... 0x2f:
  99       strncpy(token_type, "IAM",sizeof(token_type));
 100       break;
 101     case 0x30 ... 0x6f:
 102       strcpy(token_type, "SAM");
 103       break;
 104     case 0x70 ... 0x7f:
 105       strcpy(token_type, "GAM");
 106       break;
 107     default:
 108       strcpy(token_type, "???");
 109       break;
 110   }
 111
 112   stamp_len = 0xfc - data_buf[6];
 113
 114   PrintAndLog("DCF: %02x %02x, Token_Type=%s (OLE=%01u), Stamp_len=%02u",
 115     data_buf[5],
 116     data_buf[6],
 117     token_type,
 118     (data_buf[5]&0x80)>>7,
 119     stamp_len
 120   );
 121
 122   PrintAndLog("WRP=%02u, WRC=%01u, RD=%01u, raw=%02x, SSC=%02x",
 123     data_buf[7]&0x0f,
 124     (data_buf[7]&0x70)>>4,
 125     (data_buf[7]&0x80)>>7,
 126     data_buf[7],
 127     data_buf[8]
 128   );
 129
 130   PrintAndLog("Remaining Header Area");
 131
 132   PrintAndLog("%02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x",
 133       data_buf[9],
 134     data_buf[10],
 135     data_buf[11],
 136     data_buf[12],
 137     data_buf[13],
 138     data_buf[14],
 139     data_buf[15],
 140     data_buf[16],
 141     data_buf[17],
 142     data_buf[18],
 143     data_buf[19],
 144     data_buf[20],
 145     data_buf[21]
 146   );
 147
 148   PrintAndLog("\nADF: User Area");
 149
 150     i = 22;
 151   for (n=0; n<64; n++) {
 152     segment_len = ((data_buf[i+1]^crc)&0x0f) * 256 + (data_buf[i]^crc);
 153     segment_flag = ((data_buf[i+1]^crc)&0xf0)>>4;
 154
 155     wrp = (data_buf[i+2]^crc);
 156     wrc = ((data_buf[i+3]^crc)&0x70)>>4;
 157
 158      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",
 159       n,
 160       data_buf[i]^crc,
 161       data_buf[i+1]^crc,
 162       data_buf[i+2]^crc,
 163       data_buf[i+3]^crc,
 164       segment_flag,
 165       (segment_flag&0x4)>>2,
 166       (segment_flag&0x8)>>3,
 167       segment_len,
 168       wrp,
 169       wrc,
 170       ((data_buf[i+3]^crc)&0x80)>>7,
 171       (data_buf[i+4]^crc)
 172     );
 173
 174     i+=5;
 175
 176     if (wrc>0) {
 177       PrintAndLog("WRC protected area:");
 178       for (k=0, j=0; k < wrc; 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     }
 187
 188     if (wrp>wrc) {
 189       PrintAndLog("Remaining write protected area:");
 190
 191       for (k=0, j=0; k < (wrp-wrc); 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       if((wrp-wrc) == 8) {
 200         sprintf(out_string,"Card ID: %2X%02X%02X",data_buf[i-4]^crc,data_buf[i-3]^crc,data_buf[i-2]^crc);
 201         PrintAndLog("%s", out_string);
 202       }
 203     }
 204
 205     PrintAndLog("Remaining segment payload:");
 206     for (k=0, j=0; k < (segment_len - wrp - 5); k++, i++, j += 3) {
 207       sprintf(&out_string[j], "%02x", (data_buf[i]^crc));
 208       out_string[j+2] = ' ';
 209     };
 210
 211     out_string[j] = '\0';
 212
 213     PrintAndLog("%s", out_string);
 214
 215     // end with last segment
 216     if (segment_flag & 0x8)
 217       return 0;
 218   };
 219   return 0;
 220 }