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 "common.h"
  19 #include "util.h"
  20 #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   int len = strlen(Cmd);
  43
  44   char filename[FILE_PATH_SIZE]  = { 0x00 };
  45   FILE* pf = NULL;
  46
  47   if (len > FILE_PATH_SIZE)
  48      len = FILE_PATH_SIZE;
  49   memcpy(filename, Cmd, len);
  50
  51   if (strlen(filename) > 0) {
  52         if ((pf = fopen(filename,"wb")) == NULL) {
  53                 PrintAndLog("Error: Could not open file [%s]",filename);
  54                 return 1;
  55         }
  56   }
  57
  58   for (;;) {
  59
  60     if(i >= TRACE_BUFFER_SIZE) { break; }
  61
  62     bool isResponse;
  63     int timestamp = *((uint32_t *)(got+i));
  64     if (timestamp & 0x80000000) {
  65       timestamp &= 0x7fffffff;
  66       isResponse = 1;
  67     } else {
  68       isResponse = 0;
  69     }
  70
  71     int parityBits = *((uint32_t *)(got+i+4));
  72     // 4 bytes of additional information...
  73     // maximum of 32 additional parity bit information
  74     //
  75     // TODO:
  76     // at each quarter bit period we can send power level (16 levels)
  77     // or each half bit period in 256 levels.
  78
  79     int bits = got[i+8];
  80     int len = nbytes(got[i+8]);
  81
  82     if (len > 100) {
  83       break;
  84     }
  85     if (i + len >= TRACE_BUFFER_SIZE) { break;}
  86
  87     uint8_t *frame = (got+i+9);
  88
  89     // Break and stick with current result if buffer was not completely full
  90     if (frame[0] == 0x44 && frame[1] == 0x44 && frame[3] == 0x44) { break; }
  91
  92     char line[1000] = "";
  93     int j;
  94     for (j = 0; j < len; j++) {
  95       int oddparity = 0x01;
  96       int k;
  97
  98       for (k=0;k<8;k++) {
  99         oddparity ^= (((frame[j] & 0xFF) >> k) & 0x01);
 100       }
 101
 102       //if((parityBits >> (len - j - 1)) & 0x01) {
 103       if (isResponse && (oddparity != ((parityBits >> (len - j - 1)) & 0x01))) {
 104         sprintf(line+(j*4), "%02x!  ", frame[j]);
 105       }
 106       else {
 107         sprintf(line+(j*4), "%02x   ", frame[j]);
 108       }
 109     }
 110
 111     PrintAndLog(" +%7d:  %3d: %s %s",
 112       (prev < 0 ? 0 : (timestamp - prev)),
 113       bits,
 114       (isResponse ? "TAG" : "   "),
 115       line);
 116
 117
 118    if (pf) {
 119       fprintf(pf," +%7d:  %3d: %s %s\n",
 120                                         (prev < 0 ? 0 : (timestamp - prev)),
 121                                         bits,
 122                                         (isResponse ? "TAG" : "   "),
 123                                         line);
 124     }
 125
 126     prev = timestamp;
 127     i += (len + 9);
 128   }
 129
 130   if (pf) {
 131     fclose(pf);
 132         PrintAndLog("Recorded activity succesfully written to file: %s", filename);
 133   }
 134
 135   return 0;
 136 }
 137
 138 int CmdLFHitagSnoop(const char *Cmd) {
 139   UsbCommand c = {CMD_SNOOP_HITAG};
 140   SendCommand(&c);
 141   return 0;
 142 }
 143
 144 int CmdLFHitagSim(const char *Cmd) {
 145
 146   UsbCommand c = {CMD_SIMULATE_HITAG};
 147         char filename[FILE_PATH_SIZE] = { 0x00 };
 148         FILE* pf;
 149         bool tag_mem_supplied;
 150         int len = strlen(Cmd);
 151         if (len > FILE_PATH_SIZE) len = FILE_PATH_SIZE;
 152         memcpy(filename, Cmd, len);
 153
 154         if (strlen(filename) > 0) {
 155                 if ((pf = fopen(filename,"rb+")) == NULL) {
 156                         PrintAndLog("Error: Could not open file [%s]",filename);
 157                         return 1;
 158                 }
 159                 tag_mem_supplied = true;
 160                 if (fread(c.d.asBytes,48,1,pf) == 0) {
 161       PrintAndLog("Error: File reading error");
 162       fclose(pf);
 163                         return 1;
 164     }
 165                 fclose(pf);
 166         } else {
 167                 tag_mem_supplied = false;
 168         }
 169
 170         // Does the tag comes with memory
 171         c.arg[0] = (uint32_t)tag_mem_supplied;
 172
 173   SendCommand(&c);
 174   return 0;
 175 }
 176
 177 int CmdLFHitagReader(const char *Cmd) {
 178 //  UsbCommand c = {CMD_READER_HITAG};
 179
 180 //      param_get32ex(Cmd,1,0,16);
 181         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)}};
 182         hitag_data* htd = (hitag_data*)c.d.asBytes;
 183         hitag_function htf = param_get32ex(Cmd,0,0,10);
 184
 185         switch (htf) {
 186                 case RHT2F_PASSWORD: {
 187                         num_to_bytes(param_get32ex(Cmd,1,0,16),4,htd->pwd.password);
 188                 } break;
 189                 case RHT2F_AUTHENTICATE: {
 190                         num_to_bytes(param_get32ex(Cmd,1,0,16),4,htd->auth.NrAr);
 191                         num_to_bytes(param_get32ex(Cmd,2,0,16),4,htd->auth.NrAr+4);
 192                 } break;
 193                 case RHT2F_CRYPTO: {
 194                         num_to_bytes(param_get64ex(Cmd,1,0,16),6,htd->crypto.key);
 195 //                      num_to_bytes(param_get32ex(Cmd,2,0,16),4,htd->auth.NrAr+4);
 196                 } break;
 197                 case RHT2F_TEST_AUTH_ATTEMPTS: {
 198                         // No additional parameters needed
 199                 } break;
 200                 default: {
 201                         PrintAndLog("Error: unkown reader function %d",htf);
 202                         PrintAndLog("Hitag reader functions");
 203                         PrintAndLog(" HitagS (0*)");
 204                         PrintAndLog(" Hitag1 (1*)");
 205                         PrintAndLog(" Hitag2 (2*)");
 206                         PrintAndLog("  21 <password> (password mode)");
 207                         PrintAndLog("  22 <nr> <ar> (authentication)");
 208                         PrintAndLog("  23 <key> (authentication) key is in format: ISK high + ISK low");
 209                         PrintAndLog("  25 (test recorded authentications)");
 210                         return 1;
 211                 } break;
 212         }
 213
 214         // Copy the hitag2 function into the first argument
 215         c.arg[0] = htf;
 216
 217   // Send the command to the proxmark
 218   SendCommand(&c);
 219
 220   UsbCommand resp;
 221   WaitForResponse(CMD_ACK,&resp);
 222
 223   // Check the return status, stored in the first argument
 224   if (resp.arg[0] == false) return 1;
 225
 226   uint32_t id = bytes_to_num(resp.d.asBytes,4);
 227   char filename[256];
 228   FILE* pf = NULL;
 229
 230   sprintf(filename,"%08x_%04x.ht2",id,(rand() & 0xffff));
 231   if ((pf = fopen(filename,"wb")) == NULL) {
 232     PrintAndLog("Error: Could not open file [%s]",filename);
 233     return 1;
 234   }
 235
 236   // Write the 48 tag memory bytes to file and finalize
 237   fwrite(resp.d.asBytes,1,48,pf);
 238   fclose(pf);
 239
 240   PrintAndLog("Succesfully saved tag memory to [%s]",filename);
 241
 242   return 0;
 243 }
 244
 245 static command_t CommandTable[] =
 246 {
 247   {"help",    CmdHelp,           1, "This help"},
 248   {"list",    CmdLFHitagList,    1, "<outfile> List Hitag trace history"},
 249   {"reader",  CmdLFHitagReader,  1, "Act like a Hitag Reader"},
 250   {"sim",     CmdLFHitagSim,     1, "<infile> Simulate Hitag transponder"},
 251   {"snoop",   CmdLFHitagSnoop,   1, "Eavesdrop Hitag communication"},
 252                 {NULL, NULL, 0, NULL}
 253 };
 254
 255 int CmdLFHitag(const char *Cmd)
 256 {
 257   CmdsParse(CommandTable, Cmd);
 258   return 0;
 259 }
 260
 261 int CmdHelp(const char *Cmd)
 262 {
 263   CmdsHelp(CommandTable);
 264   return 0;
 265 }