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