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   {NULL, NULL, 0, NULL}
  28 };
  29
  30 int CmdHFLegic(const char *Cmd)
  31 {
  32   CmdsParse(CommandTable, Cmd);
  33   return 0;
  34 }
  35
  36 int CmdHelp(const char *Cmd)
  37 {
  38   CmdsHelp(CommandTable);
  39   return 0;
  40 }
  41
  42 /*
  43  *  Output BigBuf and deobfuscate LEGIC RF tag data.
  44  *   This is based on information given in the talk held
  45  *  by Henryk Ploetz and Karsten Nohl at 26c3
  46  */
  47 int CmdLegicDecode(const char *Cmd)
  48 {
  49   int h, i, j, k, n;
  50   int segment_len = 0;
  51   int segment_flag = 0;
  52   int stamp_len = 0;
  53   int crc = 0;
  54   int wrp = 0;
  55   int wrc = 0;
  56   int data_buf[1032]; // receiver buffer
  57   char out_string[3076]; // just use big buffer - bad practice
  58   char token_type[4];
  59   int delivered = 0;
  60
  61   h = 0;
  62
  63   // copy data from proxmark into buffer
  64   for (i = 0; i < 256; i += 12, h += 48) {
  65     UsbCommand c = {CMD_DOWNLOAD_RAW_ADC_SAMPLES_125K, {i, 0, 0}};
  66     SendCommand(&c);
  67     WaitForResponse(CMD_DOWNLOADED_RAW_ADC_SAMPLES_125K);
  68
  69     for (j = 0; j < 48; j += 8) {
  70       for (k = 0; k < 8; k++) {
  71         data_buf[h+j+k] = sample_buf[j+k];
  72       }
  73       delivered += 8;
  74       if (delivered >= 1024)
  75         break;
  76     }
  77   }
  78
  79   // Output CDF System area (9 bytes) plus remaining header area (12 bytes)
  80
  81   PrintAndLog("\nCDF: System Area");
  82
  83   PrintAndLog("MCD: %02x, MSN: %02x %02x %02x, MCC: %02x",
  84     data_buf[0],
  85     data_buf[1],
  86     data_buf[2],
  87     data_buf[3],
  88     data_buf[4]
  89   );
  90
  91   crc = data_buf[4];
  92
  93   switch (data_buf[5]&0x7f) {
  94     case 0x00 ... 0x2f:
  95       strncpy(token_type, "IAM",sizeof(token_type));
  96       break;
  97     case 0x30 ... 0x6f:
  98       strcpy(token_type, "SAM");
  99       break;
 100     case 0x70 ... 0x7f:
 101       strcpy(token_type, "GAM");
 102       break;
 103     default:
 104       strcpy(token_type, "???");
 105       break;
 106   }
 107
 108   stamp_len = 0xfc - data_buf[6];
 109
 110   PrintAndLog("DCF: %02x %02x, Token_Type=%s (OLE=%01u), Stamp_len=%02u",
 111     data_buf[5],
 112     data_buf[6],
 113     token_type,
 114     (data_buf[5]&0x80)>>7,
 115     stamp_len
 116   );
 117
 118   PrintAndLog("WRP=%02u, WRC=%01u, RD=%01u, raw=%02x, SSC=%02x",
 119     data_buf[7]&0x0f,
 120     (data_buf[7]&0x70)>>4,
 121     (data_buf[7]&0x80)>>7,
 122     data_buf[7],
 123     data_buf[8]
 124   );
 125
 126   PrintAndLog("Remaining Header Area");
 127
 128   PrintAndLog("%02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x",
 129       data_buf[9],
 130     data_buf[10],
 131     data_buf[11],
 132     data_buf[12],
 133     data_buf[13],
 134     data_buf[14],
 135     data_buf[15],
 136     data_buf[16],
 137     data_buf[17],
 138     data_buf[18],
 139     data_buf[19],
 140     data_buf[20],
 141     data_buf[21]
 142   );
 143
 144   PrintAndLog("\nADF: User Area");
 145
 146   i = 22;
 147   for (n=0; n<64; n++) {
 148     segment_len = ((data_buf[i+1]^crc)&0x0f) * 256 + (data_buf[i]^crc);
 149     segment_flag = ((data_buf[i+1]^crc)&0xf0)>>4;
 150
 151     wrp = (data_buf[i+2]^crc);
 152     wrc = ((data_buf[i+3]^crc)&0x70)>>4;
 153
 154      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",
 155       n,
 156       data_buf[i]^crc,
 157       data_buf[i+1]^crc,
 158       data_buf[i+2]^crc,
 159       data_buf[i+3]^crc,
 160       segment_flag,
 161       (segment_flag&0x4)>>2,
 162       (segment_flag&0x8)>>3,
 163       segment_len,
 164       wrp,
 165       wrc,
 166       ((data_buf[i+3]^crc)&0x80)>>7,
 167       (data_buf[i+4]^crc)
 168     );
 169
 170     i+=5;
 171
 172     if (wrc>0) {
 173       PrintAndLog("WRC protected area:");
 174       for (k=0, j=0; k < wrc && j<(sizeof(out_string)-3); k++, i++, j += 3) {
 175         sprintf(&out_string[j], "%02x", (data_buf[i]^crc));
 176         out_string[j+2] = ' ';
 177       };
 178
 179       out_string[j] = '\0';
 180
 181       PrintAndLog("%s", out_string);
 182     }
 183
 184     if (wrp>wrc) {
 185       PrintAndLog("Remaining write protected area:");
 186
 187       for (k=0, j=0; k < (wrp-wrc) && j<(sizeof(out_string)-3); k++, i++, j += 3) {
 188         sprintf(&out_string[j], "%02x", (data_buf[i]^crc));
 189         out_string[j+2] = ' ';
 190       };
 191
 192       out_string[j] = '\0';
 193
 194       PrintAndLog("%s", out_string);
 195       if((wrp-wrc) == 8) {
 196         sprintf(out_string,"Card ID: %2X%02X%02X",data_buf[i-4]^crc,data_buf[i-3]^crc,data_buf[i-2]^crc);
 197         PrintAndLog("%s", out_string);
 198       }
 199     }
 200
 201     PrintAndLog("Remaining segment payload:");
 202     for (k=0, j=0; k < (segment_len - wrp - 5) && j<(sizeof(out_string)-3); k++, i++, j += 3) {
 203       sprintf(&out_string[j], "%02x", (data_buf[i]^crc));
 204       out_string[j+2] = ' ';
 205     };
 206
 207     out_string[j] = '\0';
 208
 209     PrintAndLog("%s", out_string);
 210
 211     // end with last segment
 212     if (segment_flag & 0x8)
 213       return 0;
 214   };
 215   return 0;
 216 }
 217
 218 int CmdLegicRFRead(const char *Cmd)
 219 {
 220   int byte_count=0,offset=0;
 221   sscanf(Cmd, "%i %i", &offset, &byte_count);
 222   if(byte_count == 0) byte_count = -1;
 223   if(byte_count + offset > 1024) byte_count = 1024 - offset;
 224   UsbCommand c={CMD_READER_LEGIC_RF, {offset, byte_count, 0}};
 225   SendCommand(&c);
 226   return 0;
 227 }