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