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