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                 fread(c.d.asBytes,48,1,pf);
 151                 fclose(pf);
 152         } else {
 153                 tag_mem_supplied = false;
 154         }
 155
 156         // Does the tag comes with memory
 157         c.arg[0] = (uint32_t)tag_mem_supplied;
 158
 159   SendCommand(&c);
 160   return 0;
 161 }
 162
 163 int CmdLFHitagReader(const char *Cmd) {
 164 //  UsbCommand c = {CMD_READER_HITAG};
 165
 166 //      param_get32ex(Cmd,1,0,16);
 167         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)}};
 168         hitag_data* htd = (hitag_data*)c.d.asBytes;
 169         hitag_function htf = param_get32ex(Cmd,0,0,10);
 170
 171         switch (htf) {
 172                 case RHT2F_PASSWORD: {
 173                         num_to_bytes(param_get32ex(Cmd,1,0,16),4,htd->pwd.password);
 174                 } break;
 175                 case RHT2F_AUTHENTICATE: {
 176                         num_to_bytes(param_get32ex(Cmd,1,0,16),4,htd->auth.NrAr);
 177                         num_to_bytes(param_get32ex(Cmd,2,0,16),4,htd->auth.NrAr+4);
 178                 } break;
 179                 case RHT2F_CRYPTO: {
 180                         num_to_bytes(param_get64ex(Cmd,1,0,16),6,htd->crypto.key);
 181 //                      num_to_bytes(param_get32ex(Cmd,2,0,16),4,htd->auth.NrAr+4);
 182                 } break;
 183                 case RHT2F_TEST_AUTH_ATTEMPTS: {
 184                         // No additional parameters needed
 185                 } break;
 186                 default: {
 187                         PrintAndLog("Error: unkown reader function %d",htf);
 188                         PrintAndLog("Hitag reader functions");
 189                         PrintAndLog(" HitagS (0*)");
 190                         PrintAndLog(" Hitag1 (1*)");
 191                         PrintAndLog(" Hitag2 (2*)");
 192                         PrintAndLog("  21 <password> (password mode)");
 193                         PrintAndLog("  22 <nr> <ar> (authentication)");
 194                         PrintAndLog("  23 <key> (authentication) key is in format: ISK high + ISK low");
 195                         PrintAndLog("  25 (test recorded authentications)");
 196                         return 1;
 197                 } break;
 198         }
 199
 200         // Copy the hitag2 function into the first argument
 201         c.arg[0] = htf;
 202
 203   // Send the command to the proxmark
 204   SendCommand(&c);
 205
 206   UsbCommand resp;
 207   WaitForResponse(CMD_ACK,&resp);
 208
 209   // Check the return status, stored in the first argument
 210   if (resp.arg[0] == false) return 1;
 211
 212   uint32_t id = bytes_to_num(resp.d.asBytes,4);
 213   char filename[256];
 214   FILE* pf = NULL;
 215
 216   sprintf(filename,"%08x_%04x.ht2",id,(rand() & 0xffff));
 217   if ((pf = fopen(filename,"wb")) == NULL) {
 218     PrintAndLog("Error: Could not open file [%s]",filename);
 219     return 1;
 220   }
 221
 222   // Write the 48 tag memory bytes to file and finalize
 223   fwrite(resp.d.asBytes,1,48,pf);
 224   fclose(pf);
 225
 226   PrintAndLog("Succesfully saved tag memory to [%s]",filename);
 227
 228   return 0;
 229 }
 230
 231 static command_t CommandTableHitag[] =
 232 {
 233   {"help",    CmdHelp,           1, "This help"},
 234   {"list",    CmdLFHitagList,    1, "List Hitag trace history"},
 235   {"reader",  CmdLFHitagReader,  1, "Act like a Hitag Reader"},
 236   {"sim",     CmdLFHitagSim,     1, "Simulate Hitag transponder"},
 237   {"snoop",   CmdLFHitagSnoop,   1, "Eavesdrop Hitag communication"},
 238                 {NULL, NULL, 0, NULL}
 239 };
 240
 241 int CmdLFHitag(const char *Cmd)
 242 {
 243   CmdsParse(CommandTableHitag, Cmd);
 244   return 0;
 245 }
 246
 247 int CmdHelp(const char *Cmd)
 248 {
 249   CmdsHelp(CommandTableHitag);
 250   return 0;
 251 }