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

   1 //-----------------------------------------------------------------------------
   2 // Copyright (C) 2012 Roel Verdult
   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 // Low frequency Hitag support
   9 //-----------------------------------------------------------------------------
  10
  11 #include <stdio.h>
  12 #include <stdlib.h>
  13 #include <string.h>
  14 #include "data.h"
  15 #include "proxmark3.h"
  16 #include "ui.h"
  17 #include "cmdparser.h"
  18 #include "../include/common.h"
  19 #include "util.h"
  20 #include "../include/hitag2.h"
  21 #include "sleep.h"
  22 #include "cmdmain.h"
  23
  24 static int CmdHelp(const char *Cmd);
  25
  26 size_t nbytes(size_t nbits) {
  27         return (nbits/8)+((nbits%8)>0);
  28 }
  29
  30 int CmdLFHitagList(const char *Cmd)
  31 {
  32   uint8_t got[3000];
  33   GetFromBigBuf(got,sizeof(got),0);
  34   WaitForResponse(CMD_ACK,NULL);
  35
  36   PrintAndLog("recorded activity:");
  37   PrintAndLog(" ETU     :nbits: who bytes");
  38   PrintAndLog("---------+-----+----+-----------");
  39
  40   int i = 0;
  41   int prev = -1;
  42
  43   char filename[256];
  44   FILE* pf = NULL;
  45
  46   for (;;) {
  47     if(i >= 1900) {
  48       break;
  49     }
  50
  51     bool isResponse;
  52     int timestamp = *((uint32_t *)(got+i));
  53     if (timestamp & 0x80000000) {
  54       timestamp &= 0x7fffffff;
  55       isResponse = 1;
  56     } else {
  57       isResponse = 0;
  58     }
  59
  60     int parityBits = *((uint32_t *)(got+i+4));
  61     // 4 bytes of additional information...
  62     // maximum of 32 additional parity bit information
  63     //
  64     // TODO:
  65     // at each quarter bit period we can send power level (16 levels)
  66     // or each half bit period in 256 levels.
  67
  68     int bits = got[i+8];
  69     int len = nbytes(got[i+8]);
  70
  71     if (len > 100) {
  72       break;
  73     }
  74     if (i + len >= 1900) {
  75       break;
  76     }
  77
  78     uint8_t *frame = (got+i+9);
  79
  80     // Break and stick with current result if buffer was not completely full
  81     if (frame[0] == 0x44 && frame[1] == 0x44 && frame[3] == 0x44) { break; }
  82
  83     char line[1000] = "";
  84     int j;
  85     for (j = 0; j < len; j++) {
  86       int oddparity = 0x01;
  87       int k;
  88
  89       for (k=0;k<8;k++) {
  90         oddparity ^= (((frame[j] & 0xFF) >> k) & 0x01);
  91       }
  92
  93       //if((parityBits >> (len - j - 1)) & 0x01) {
  94       if (isResponse && (oddparity != ((parityBits >> (len - j - 1)) & 0x01))) {
  95         sprintf(line+(j*4), "%02x!  ", frame[j]);
  96       }
  97       else {
  98         sprintf(line+(j*4), "%02x   ", frame[j]);
  99       }
 100     }
 101
 102     PrintAndLog(" +%7d:  %3d: %s %s",
 103       (prev < 0 ? 0 : (timestamp - prev)),
 104       bits,
 105       (isResponse ? "TAG" : "   "),
 106       line);
 107
 108
 109    if (pf) {
 110       fprintf(pf," +%7d:  %3d: %s %s\n",
 111                                         (prev < 0 ? 0 : (timestamp - prev)),
 112                                         bits,
 113                                         (isResponse ? "TAG" : "   "),
 114                                         line);
 115     }
 116
 117     prev = timestamp;
 118     i += (len + 9);
 119   }
 120
 121   if (pf) {
 122           PrintAndLog("Recorded activity succesfully written to file: %s", filename);
 123     fclose(pf);
 124   }
 125
 126   return 0;
 127 }
 128
 129 int CmdLFHitagSnoop(const char *Cmd) {
 130   UsbCommand c = {CMD_SNOOP_HITAG};
 131   SendCommand(&c);
 132   return 0;
 133 }
 134
 135 int CmdLFHitagSim(const char *Cmd) {
 136   UsbCommand c = {CMD_SIMULATE_HITAG};
 137         char filename[256] = { 0x00 };
 138         FILE* pf;
 139         bool tag_mem_supplied;
 140
 141         param_getstr(Cmd,0,filename);
 142
 143         if (strlen(filename) > 0) {
 144                 if ((pf = fopen(filename,"rb+")) == NULL) {
 145                         PrintAndLog("Error: Could not open file [%s]",filename);
 146                         return 1;
 147                 }
 148                 tag_mem_supplied = true;
 149                 if (fread(c.d.asBytes,48,1,pf) == 0) {
 150       PrintAndLog("Error: File reading error");
 151                         return 1;
 152     }
 153                 fclose(pf);
 154         } else {
 155                 tag_mem_supplied = false;
 156         }
 157
 158         // Does the tag comes with memory
 159         c.arg[0] = (uint32_t)tag_mem_supplied;
 160
 161   SendCommand(&c);
 162   return 0;
 163 }
 164
 165 int CmdLFHitagReader(const char *Cmd) {
 166 //  UsbCommand c = {CMD_READER_HITAG};
 167
 168 //      param_get32ex(Cmd,1,0,16);
 169         UsbCommand c = {CMD_READER_HITAG};//, {param_get32ex(Cmd,0,0,10),param_get32ex(Cmd,1,0,16),param_get32ex(Cmd,2,0,16),param_get32ex(Cmd,3,0,16)}};
 170         hitag_data* htd = (hitag_data*)c.d.asBytes;
 171         hitag_function htf = param_get32ex(Cmd,0,0,10);
 172
 173         switch (htf) {
 174                 case RHT2F_PASSWORD: {
 175                         num_to_bytes(param_get32ex(Cmd,1,0,16),4,htd->pwd.password);
 176                 } break;
 177                 case RHT2F_AUTHENTICATE: {
 178                         num_to_bytes(param_get32ex(Cmd,1,0,16),4,htd->auth.NrAr);
 179                         num_to_bytes(param_get32ex(Cmd,2,0,16),4,htd->auth.NrAr+4);
 180                 } break;
 181                 case RHT2F_CRYPTO: {
 182                         num_to_bytes(param_get64ex(Cmd,1,0,16),6,htd->crypto.key);
 183 //                      num_to_bytes(param_get32ex(Cmd,2,0,16),4,htd->auth.NrAr+4);
 184                 } break;
 185                 case RHT2F_TEST_AUTH_ATTEMPTS: {
 186                         // No additional parameters needed
 187                 } break;
 188                 default: {
 189                         PrintAndLog("Error: unkown reader function %d",htf);
 190                         PrintAndLog("Hitag reader functions");
 191                         PrintAndLog(" HitagS (0*)");
 192                         PrintAndLog(" Hitag1 (1*)");
 193                         PrintAndLog(" Hitag2 (2*)");
 194                         PrintAndLog("  21 <password> (password mode)");
 195                         PrintAndLog("  22 <nr> <ar> (authentication)");
 196                         PrintAndLog("  23 <key> (authentication) key is in format: ISK high + ISK low");
 197                         PrintAndLog("  25 (test recorded authentications)");
 198                         return 1;
 199                 } break;
 200         }
 201
 202         // Copy the hitag2 function into the first argument
 203         c.arg[0] = htf;
 204
 205   // Send the command to the proxmark
 206   SendCommand(&c);
 207
 208   UsbCommand resp;
 209   WaitForResponse(CMD_ACK,&resp);
 210
 211   // Check the return status, stored in the first argument
 212   if (resp.arg[0] == false) return 1;
 213
 214   uint32_t id = bytes_to_num(resp.d.asBytes,4);
 215   char filename[256];
 216   FILE* pf = NULL;
 217
 218   sprintf(filename,"%08x_%04x.ht2",id,(rand() & 0xffff));
 219   if ((pf = fopen(filename,"wb")) == NULL) {
 220     PrintAndLog("Error: Could not open file [%s]",filename);
 221     return 1;
 222   }
 223
 224   // Write the 48 tag memory bytes to file and finalize
 225   fwrite(resp.d.asBytes,1,48,pf);
 226   fclose(pf);
 227
 228   PrintAndLog("Succesfully saved tag memory to [%s]",filename);
 229
 230   return 0;
 231 }
 232
 233 static command_t CommandTableHitag[] =
 234 {
 235   {"help",    CmdHelp,           1, "This help"},
 236   {"list",    CmdLFHitagList,    1, "List Hitag trace history"},
 237   {"reader",  CmdLFHitagReader,  1, "Act like a Hitag Reader"},
 238   {"sim",     CmdLFHitagSim,     1, "Simulate Hitag transponder"},
 239   {"snoop",   CmdLFHitagSnoop,   1, "Eavesdrop Hitag communication"},
 240                 {NULL, NULL, 0, NULL}
 241 };
 242
 243 int CmdLFHitag(const char *Cmd)
 244 {
 245   CmdsParse(CommandTableHitag, Cmd);
 246   return 0;
 247 }
 248
 249 int CmdHelp(const char *Cmd)
 250 {
 251   CmdsHelp(CommandTableHitag);
 252   return 0;
 253 }