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   char filename[256];
  45   FILE* pf = NULL;
  46
  47   for (;;) {
  48     if(i >= 1900) {
  49       break;
  50     }
  51
  52     bool isResponse;
  53     int timestamp = *((uint32_t *)(got+i));
  54     if (timestamp & 0x80000000) {
  55       timestamp &= 0x7fffffff;
  56       isResponse = 1;
  57     } else {
  58       isResponse = 0;
  59     }
  60
  61     int parityBits = *((uint32_t *)(got+i+4));
  62     // 4 bytes of additional information...
  63     // maximum of 32 additional parity bit information
  64     //
  65     // TODO:
  66     // at each quarter bit period we can send power level (16 levels)
  67     // or each half bit period in 256 levels.
  68
  69     int bits = got[i+8];
  70     int len = nbytes(got[i+8]);
  71
  72     if (len > 100) {
  73       break;
  74     }
  75     if (i + len >= 1900) {
  76       break;
  77     }
  78
  79     uint8_t *frame = (got+i+9);
  80
  81     // Break and stick with current result if buffer was not completely full
  82     if (frame[0] == 0x44 && frame[1] == 0x44 && frame[3] == 0x44) { break; }
  83
  84     char line[1000] = "";
  85     int j;
  86     for (j = 0; j < len; j++) {
  87       int oddparity = 0x01;
  88       int k;
  89
  90       for (k=0;k<8;k++) {
  91         oddparity ^= (((frame[j] & 0xFF) >> k) & 0x01);
  92       }
  93
  94       //if((parityBits >> (len - j - 1)) & 0x01) {
  95       if (isResponse && (oddparity != ((parityBits >> (len - j - 1)) & 0x01))) {
  96         sprintf(line+(j*4), "%02x!  ", frame[j]);
  97       }
  98       else {
  99         sprintf(line+(j*4), "%02x   ", frame[j]);
 100       }
 101     }
 102
 103     PrintAndLog(" +%7d:  %3d: %s %s",
 104       (prev < 0 ? 0 : (timestamp - prev)),
 105       bits,
 106       (isResponse ? "TAG" : "   "),
 107       line);
 108
 109
 110    if (pf) {
 111       fprintf(pf," +%7d:  %3d: %s %s\n",
 112                                         (prev < 0 ? 0 : (timestamp - prev)),
 113                                         bits,
 114                                         (isResponse ? "TAG" : "   "),
 115                                         line);
 116     }
 117
 118     prev = timestamp;
 119     i += (len + 9);
 120   }
 121
 122   if (pf) {
 123           PrintAndLog("Recorded activity succesfully written to file: %s", filename);
 124     fclose(pf);
 125   }
 126
 127   return 0;
 128 }
 129
 130 int CmdLFHitagSnoop(const char *Cmd) {
 131   UsbCommand c = {CMD_SNOOP_HITAG};
 132   SendCommand(&c);
 133   return 0;
 134 }
 135
 136 int CmdLFHitagSim(const char *Cmd) {
 137   UsbCommand c = {CMD_SIMULATE_HITAG};
 138         char filename[256] = { 0x00 };
 139         FILE* pf;
 140         bool tag_mem_supplied;
 141
 142         param_getstr(Cmd,0,filename);
 143
 144         if (strlen(filename) > 0) {
 145                 if ((pf = fopen(filename,"rb+")) == NULL) {
 146                         PrintAndLog("Error: Could not open file [%s]",filename);
 147                         return 1;
 148                 }
 149                 tag_mem_supplied = true;
 150                 if (fread(c.d.asBytes,48,1,pf) == 0) {
 151       PrintAndLog("Error: File reading error");
 152       fclose(pf);
 153                         return 1;
 154     }
 155                 fclose(pf);
 156         } else {
 157                 tag_mem_supplied = false;
 158         }
 159
 160         // Does the tag comes with memory
 161         c.arg[0] = (uint32_t)tag_mem_supplied;
 162
 163   SendCommand(&c);
 164   return 0;
 165 }
 166
 167 int CmdLFHitagReader(const char *Cmd) {
 168 //  UsbCommand c = {CMD_READER_HITAG};
 169
 170 //      param_get32ex(Cmd,1,0,16);
 171         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)}};
 172         hitag_data* htd = (hitag_data*)c.d.asBytes;
 173         hitag_function htf = param_get32ex(Cmd,0,0,10);
 174
 175         switch (htf) {
 176                 case RHT2F_PASSWORD: {
 177                         num_to_bytes(param_get32ex(Cmd,1,0,16),4,htd->pwd.password);
 178                 } break;
 179                 case RHT2F_AUTHENTICATE: {
 180                         num_to_bytes(param_get32ex(Cmd,1,0,16),4,htd->auth.NrAr);
 181                         num_to_bytes(param_get32ex(Cmd,2,0,16),4,htd->auth.NrAr+4);
 182                 } break;
 183                 case RHT2F_CRYPTO: {
 184                         num_to_bytes(param_get64ex(Cmd,1,0,16),6,htd->crypto.key);
 185 //                      num_to_bytes(param_get32ex(Cmd,2,0,16),4,htd->auth.NrAr+4);
 186                 } break;
 187                 case RHT2F_TEST_AUTH_ATTEMPTS: {
 188                         // No additional parameters needed
 189                 } break;
 190                 default: {
 191                         PrintAndLog("Error: unkown reader function %d",htf);
 192                         PrintAndLog("Hitag reader functions");
 193                         PrintAndLog(" HitagS (0*)");
 194                         PrintAndLog(" Hitag1 (1*)");
 195                         PrintAndLog(" Hitag2 (2*)");
 196                         PrintAndLog("  21 <password> (password mode)");
 197                         PrintAndLog("  22 <nr> <ar> (authentication)");
 198                         PrintAndLog("  23 <key> (authentication) key is in format: ISK high + ISK low");
 199                         PrintAndLog("  25 (test recorded authentications)");
 200                         return 1;
 201                 } break;
 202         }
 203
 204         // Copy the hitag2 function into the first argument
 205         c.arg[0] = htf;
 206
 207   // Send the command to the proxmark
 208   SendCommand(&c);
 209
 210   UsbCommand resp;
 211   WaitForResponse(CMD_ACK,&resp);
 212
 213   // Check the return status, stored in the first argument
 214   if (resp.arg[0] == false) return 1;
 215
 216   uint32_t id = bytes_to_num(resp.d.asBytes,4);
 217   char filename[256];
 218   FILE* pf = NULL;
 219
 220   sprintf(filename,"%08x_%04x.ht2",id,(rand() & 0xffff));
 221   if ((pf = fopen(filename,"wb")) == NULL) {
 222     PrintAndLog("Error: Could not open file [%s]",filename);
 223     return 1;
 224   }
 225
 226   // Write the 48 tag memory bytes to file and finalize
 227   fwrite(resp.d.asBytes,1,48,pf);
 228   fclose(pf);
 229
 230   PrintAndLog("Succesfully saved tag memory to [%s]",filename);
 231
 232   return 0;
 233 }
 234
 235 static command_t CommandTableHitag[] =
 236 {
 237   {"help",    CmdHelp,           1, "This help"},
 238   {"list",    CmdLFHitagList,    1, "List Hitag trace history"},
 239   {"reader",  CmdLFHitagReader,  1, "Act like a Hitag Reader"},
 240   {"sim",     CmdLFHitagSim,     1, "Simulate Hitag transponder"},
 241   {"snoop",   CmdLFHitagSnoop,   1, "Eavesdrop Hitag communication"},
 242                 {NULL, NULL, 0, NULL}
 243 };
 244
 245 int CmdLFHitag(const char *Cmd)
 246 {
 247   CmdsParse(CommandTableHitag, Cmd);
 248   return 0;
 249 }
 250
 251 int CmdHelp(const char *Cmd)
 252 {
 253   CmdsHelp(CommandTableHitag);
 254   return 0;
 255 }