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 = malloc(USB_CMD_DATA_SIZE);
  33
  34         // Query for the actual size of the trace
  35         UsbCommand response;
  36         GetFromBigBuf(got, USB_CMD_DATA_SIZE, 0);
  37         WaitForResponse(CMD_ACK, &response);
  38         uint16_t traceLen = response.arg[2];
  39         if (traceLen > USB_CMD_DATA_SIZE) {
  40                 uint8_t *p = realloc(got, traceLen);
  41                 if (p == NULL) {
  42                         PrintAndLog("Cannot allocate memory for trace");
  43                         free(got);
  44                         return 2;
  45                 }
  46                 got = p;
  47                 GetFromBigBuf(got, traceLen, 0);
  48                 WaitForResponse(CMD_ACK,NULL);
  49         }
  50
  51         PrintAndLog("recorded activity (TraceLen = %d bytes):");
  52         PrintAndLog(" ETU     :nbits: who bytes");
  53         PrintAndLog("---------+-----+----+-----------");
  54
  55         int i = 0;
  56         int prev = -1;
  57         int len = strlen(Cmd);
  58
  59         char filename[FILE_PATH_SIZE]  = { 0x00 };
  60         FILE* pf = NULL;
  61
  62         if (len > FILE_PATH_SIZE)
  63                 len = FILE_PATH_SIZE;
  64         memcpy(filename, Cmd, len);
  65
  66         if (strlen(filename) > 0) {
  67                 if ((pf = fopen(filename,"wb")) == NULL) {
  68                         PrintAndLog("Error: Could not open file [%s]",filename);
  69                         return 1;
  70                 }
  71         }
  72
  73         for (;;) {
  74
  75                 if(i > traceLen) { break; }
  76
  77                 bool isResponse;
  78                 int timestamp = *((uint32_t *)(got+i));
  79                 if (timestamp & 0x80000000) {
  80                         timestamp &= 0x7fffffff;
  81                         isResponse = 1;
  82                 } else {
  83                         isResponse = 0;
  84                 }
  85
  86                 int parityBits = *((uint32_t *)(got+i+4));
  87                 // 4 bytes of additional information...
  88                 // maximum of 32 additional parity bit information
  89                 //
  90                 // TODO:
  91                 // at each quarter bit period we can send power level (16 levels)
  92                 // or each half bit period in 256 levels.
  93
  94                 int bits = got[i+8];
  95                 int len = nbytes(got[i+8]);
  96
  97                 if (len > 100) {
  98                   break;
  99                 }
 100                 if (i + len > traceLen) { break;}
 101
 102                 uint8_t *frame = (got+i+9);
 103
 104                 // Break and stick with current result if buffer was not completely full
 105                 if (frame[0] == 0x44 && frame[1] == 0x44 && frame[3] == 0x44) { break; }
 106
 107                 char line[1000] = "";
 108                 int j;
 109                 for (j = 0; j < len; j++) {
 110                   int oddparity = 0x01;
 111                   int k;
 112
 113                   for (k=0;k<8;k++) {
 114                         oddparity ^= (((frame[j] & 0xFF) >> k) & 0x01);
 115                   }
 116
 117                   //if((parityBits >> (len - j - 1)) & 0x01) {
 118                   if (isResponse && (oddparity != ((parityBits >> (len - j - 1)) & 0x01))) {
 119                         sprintf(line+(j*4), "%02x!  ", frame[j]);
 120                   }
 121                   else {
 122                         sprintf(line+(j*4), "%02x   ", frame[j]);
 123                   }
 124                 }
 125
 126                 PrintAndLog(" +%7d:  %3d: %s %s",
 127                         (prev < 0 ? 0 : (timestamp - prev)),
 128                         bits,
 129                         (isResponse ? "TAG" : "   "),
 130                         line);
 131
 132                 if (pf) {
 133                         fprintf(pf," +%7d:  %3d: %s %s\n",
 134                                 (prev < 0 ? 0 : (timestamp - prev)),
 135                                 bits,
 136                                 (isResponse ? "TAG" : "   "),
 137                                 line);
 138                 }
 139
 140                 prev = timestamp;
 141                 i += (len + 9);
 142         }
 143
 144         if (pf) {
 145                 fclose(pf);
 146                 PrintAndLog("Recorded activity succesfully written to file: %s", filename);
 147         }
 148
 149         free(got);
 150         return 0;
 151 }
 152
 153 int CmdLFHitagSnoop(const char *Cmd) {
 154   UsbCommand c = {CMD_SNOOP_HITAG};
 155   SendCommand(&c);
 156   return 0;
 157 }
 158
 159 int CmdLFHitagSim(const char *Cmd) {
 160
 161   UsbCommand c = {CMD_SIMULATE_HITAG};
 162         char filename[FILE_PATH_SIZE] = { 0x00 };
 163         FILE* pf;
 164         bool tag_mem_supplied;
 165         int len = strlen(Cmd);
 166         if (len > FILE_PATH_SIZE) len = FILE_PATH_SIZE;
 167         memcpy(filename, Cmd, len);
 168
 169         if (strlen(filename) > 0) {
 170                 if ((pf = fopen(filename,"rb+")) == NULL) {
 171                         PrintAndLog("Error: Could not open file [%s]",filename);
 172                         return 1;
 173                 }
 174                 tag_mem_supplied = true;
 175                 if (fread(c.d.asBytes,48,1,pf) == 0) {
 176       PrintAndLog("Error: File reading error");
 177       fclose(pf);
 178                         return 1;
 179     }
 180                 fclose(pf);
 181         } else {
 182                 tag_mem_supplied = false;
 183         }
 184
 185         // Does the tag comes with memory
 186         c.arg[0] = (uint32_t)tag_mem_supplied;
 187
 188   SendCommand(&c);
 189   return 0;
 190 }
 191
 192 int CmdLFHitagReader(const char *Cmd) {
 193 //  UsbCommand c = {CMD_READER_HITAG};
 194
 195 //      param_get32ex(Cmd,1,0,16);
 196         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)}};
 197         hitag_data* htd = (hitag_data*)c.d.asBytes;
 198         hitag_function htf = param_get32ex(Cmd,0,0,10);
 199
 200         switch (htf) {
 201                 case RHT2F_PASSWORD: {
 202                         num_to_bytes(param_get32ex(Cmd,1,0,16),4,htd->pwd.password);
 203                 } break;
 204                 case RHT2F_AUTHENTICATE: {
 205                         num_to_bytes(param_get32ex(Cmd,1,0,16),4,htd->auth.NrAr);
 206                         num_to_bytes(param_get32ex(Cmd,2,0,16),4,htd->auth.NrAr+4);
 207                 } break;
 208                 case RHT2F_CRYPTO: {
 209                         num_to_bytes(param_get64ex(Cmd,1,0,16),6,htd->crypto.key);
 210 //                      num_to_bytes(param_get32ex(Cmd,2,0,16),4,htd->auth.NrAr+4);
 211                 } break;
 212                 case RHT2F_TEST_AUTH_ATTEMPTS: {
 213                         // No additional parameters needed
 214                 } break;
 215                 default: {
 216                         PrintAndLog("Error: unkown reader function %d",htf);
 217                         PrintAndLog("Hitag reader functions");
 218                         PrintAndLog(" HitagS (0*)");
 219                         PrintAndLog(" Hitag1 (1*)");
 220                         PrintAndLog(" Hitag2 (2*)");
 221                         PrintAndLog("  21 <password> (password mode)");
 222                         PrintAndLog("  22 <nr> <ar> (authentication)");
 223                         PrintAndLog("  23 <key> (authentication) key is in format: ISK high + ISK low");
 224                         PrintAndLog("  25 (test recorded authentications)");
 225                         return 1;
 226                 } break;
 227         }
 228
 229         // Copy the hitag2 function into the first argument
 230         c.arg[0] = htf;
 231
 232   // Send the command to the proxmark
 233   SendCommand(&c);
 234
 235   UsbCommand resp;
 236   WaitForResponse(CMD_ACK,&resp);
 237
 238   // Check the return status, stored in the first argument
 239   if (resp.arg[0] == false) return 1;
 240
 241   uint32_t id = bytes_to_num(resp.d.asBytes,4);
 242   char filename[256];
 243   FILE* pf = NULL;
 244
 245   sprintf(filename,"%08x_%04x.ht2",id,(rand() & 0xffff));
 246   if ((pf = fopen(filename,"wb")) == NULL) {
 247     PrintAndLog("Error: Could not open file [%s]",filename);
 248     return 1;
 249   }
 250
 251   // Write the 48 tag memory bytes to file and finalize
 252   fwrite(resp.d.asBytes,1,48,pf);
 253   fclose(pf);
 254
 255   PrintAndLog("Succesfully saved tag memory to [%s]",filename);
 256
 257   return 0;
 258 }
 259
 260 static command_t CommandTable[] =
 261 {
 262   {"help",    CmdHelp,           1, "This help"},
 263   {"list",    CmdLFHitagList,    1, "<outfile> List Hitag trace history"},
 264   {"reader",  CmdLFHitagReader,  1, "Act like a Hitag Reader"},
 265   {"sim",     CmdLFHitagSim,     1, "<infile> Simulate Hitag transponder"},
 266   {"snoop",   CmdLFHitagSnoop,   1, "Eavesdrop Hitag communication"},
 267                 {NULL, NULL, 0, NULL}
 268 };
 269
 270 int CmdLFHitag(const char *Cmd)
 271 {
 272   CmdsParse(CommandTable, Cmd);
 273   return 0;
 274 }
 275
 276 int CmdHelp(const char *Cmd)
 277 {
 278   CmdsHelp(CommandTable);
 279   return 0;
 280 }