git.zerfleddert.de Git - proxmark3-svn/blob - client/cmdhf14b.c

   1 //-----------------------------------------------------------------------------
   2 // Copyright (C) 2010 iZsh <izsh at fail0verflow.com>
   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 // High frequency ISO14443B commands
   9 //-----------------------------------------------------------------------------
  10
  11 #include <stdio.h>
  12 #include <stdlib.h>
  13 #include <stdbool.h>
  14 #include <string.h>
  15 #include <stdint.h>
  16 #include "../common/iso14443crc.h"
  17 #include "proxmark3.h"
  18 #include "data.h"
  19 #include "graph.h"
  20 #include "ui.h"
  21 #include "cmdparser.h"
  22 #include "cmdhf14b.h"
  23 #include "cmdmain.h"
  24
  25 static int CmdHelp(const char *Cmd);
  26
  27 int CmdHF14BDemod(const char *Cmd)
  28 {
  29   int i, j, iold;
  30   int isum, qsum;
  31   int outOfWeakAt;
  32   bool negateI, negateQ;
  33
  34   uint8_t data[256];
  35   int dataLen = 0;
  36
  37   // As received, the samples are pairs, correlations against I and Q
  38   // square waves. So estimate angle of initial carrier (or just
  39   // quadrant, actually), and then do the demod.
  40
  41   // First, estimate where the tag starts modulating.
  42   for (i = 0; i < GraphTraceLen; i += 2) {
  43     if (abs(GraphBuffer[i]) + abs(GraphBuffer[i + 1]) > 40) {
  44       break;
  45     }
  46   }
  47   if (i >= GraphTraceLen) {
  48     PrintAndLog("too weak to sync");
  49     return 0;
  50   }
  51   PrintAndLog("out of weak at %d", i);
  52   outOfWeakAt = i;
  53
  54   // Now, estimate the phase in the initial modulation of the tag
  55   isum = 0;
  56   qsum = 0;
  57   for (; i < (outOfWeakAt + 16); i += 2) {
  58     isum += GraphBuffer[i + 0];
  59     qsum += GraphBuffer[i + 1];
  60   }
  61   negateI = (isum < 0);
  62   negateQ = (qsum < 0);
  63
  64   // Turn the correlation pairs into soft decisions on the bit.
  65   j = 0;
  66   for (i = 0; i < GraphTraceLen / 2; i++) {
  67     int si = GraphBuffer[j];
  68     int sq = GraphBuffer[j + 1];
  69     if (negateI) si = -si;
  70     if (negateQ) sq = -sq;
  71     GraphBuffer[i] = si + sq;
  72     j += 2;
  73   }
  74   GraphTraceLen = i;
  75
  76   i = outOfWeakAt / 2;
  77   while (GraphBuffer[i] > 0 && i < GraphTraceLen)
  78     i++;
  79   if (i >= GraphTraceLen) goto demodError;
  80
  81   iold = i;
  82   while (GraphBuffer[i] < 0 && i < GraphTraceLen)
  83     i++;
  84   if (i >= GraphTraceLen) goto demodError;
  85   if ((i - iold) > 23) goto demodError;
  86
  87   PrintAndLog("make it to demod loop");
  88
  89   for (;;) {
  90     iold = i;
  91     while (GraphBuffer[i] >= 0 && i < GraphTraceLen)
  92       i++;
  93     if (i >= GraphTraceLen) goto demodError;
  94     if ((i - iold) > 6) goto demodError;
  95
  96     uint16_t shiftReg = 0;
  97     if (i + 20 >= GraphTraceLen) goto demodError;
  98
  99     for (j = 0; j < 10; j++) {
 100       int soft = GraphBuffer[i] + GraphBuffer[i + 1];
 101
 102       if (abs(soft) < (abs(isum) + abs(qsum)) / 20) {
 103         PrintAndLog("weak bit");
 104       }
 105
 106       shiftReg >>= 1;
 107       if(GraphBuffer[i] + GraphBuffer[i+1] >= 0) {
 108         shiftReg |= 0x200;
 109       }
 110
 111       i+= 2;
 112     }
 113
 114     if ((shiftReg & 0x200) && !(shiftReg & 0x001))
 115     {
 116       // valid data byte, start and stop bits okay
 117       PrintAndLog("   %02x", (shiftReg >> 1) & 0xff);
 118       data[dataLen++] = (shiftReg >> 1) & 0xff;
 119       if (dataLen >= sizeof(data)) {
 120         return 0;
 121       }
 122     } else if (shiftReg == 0x000) {
 123       // this is EOF
 124       break;
 125     } else {
 126       goto demodError;
 127     }
 128   }
 129
 130   uint8_t first, second;
 131   ComputeCrc14443(CRC_14443_B, data, dataLen-2, &first, &second);
 132   PrintAndLog("CRC: %02x %02x (%s)\n", first, second,
 133     (first == data[dataLen-2] && second == data[dataLen-1]) ?
 134       "ok" : "****FAIL****");
 135
 136   RepaintGraphWindow();
 137   return 0;
 138
 139 demodError:
 140   PrintAndLog("demod error");
 141   RepaintGraphWindow();
 142   return 0;
 143 }
 144
 145 int CmdHF14BList(const char *Cmd)
 146 {
 147   uint8_t got[960];
 148   GetFromBigBuf(got,sizeof(got),0);
 149   WaitForResponse(CMD_ACK,NULL);
 150
 151   PrintAndLog("recorded activity:");
 152   PrintAndLog(" time  :rssi: who bytes");
 153   PrintAndLog("---------+----+----+-----------");
 154
 155   int i = 0;
 156   int prev = -1;
 157
 158   for(;;) {
 159     if(i >= 900) {
 160       break;
 161     }
 162
 163     bool isResponse;
 164     int timestamp = *((uint32_t *)(got+i));
 165     if(timestamp & 0x80000000) {
 166       timestamp &= 0x7fffffff;
 167       isResponse = 1;
 168     } else {
 169       isResponse = 0;
 170     }
 171     int metric = *((uint32_t *)(got+i+4));
 172
 173     int len = got[i+8];
 174
 175     if(len > 100) {
 176       break;
 177     }
 178     if(i + len >= 900) {
 179       break;
 180     }
 181
 182     uint8_t *frame = (got+i+9);
 183
 184         // Break and stick with current result if buffer was not completely full
 185         if (frame[0] == 0x44 && frame[1] == 0x44 && frame[2] == 0x44 && frame[3] == 0x44) break;
 186
 187     char line[1000] = "";
 188     int j;
 189     for(j = 0; j < len; j++) {
 190       sprintf(line+(j*3), "%02x  ", frame[j]);
 191     }
 192
 193     char *crc;
 194     if(len > 2) {
 195       uint8_t b1, b2;
 196       ComputeCrc14443(CRC_14443_B, frame, len-2, &b1, &b2);
 197       if(b1 != frame[len-2] || b2 != frame[len-1]) {
 198         crc = "**FAIL CRC**";
 199       } else {
 200         crc = "";
 201       }
 202     } else {
 203       crc = "(SHORT)";
 204     }
 205
 206     char metricString[100];
 207     if(isResponse) {
 208       sprintf(metricString, "%3d", metric);
 209     } else {
 210       strcpy(metricString, "   ");
 211     }
 212
 213     PrintAndLog(" +%7d: %s: %s %s %s",
 214       (prev < 0 ? 0 : timestamp - prev),
 215       metricString,
 216       (isResponse ? "TAG" : "   "), line, crc);
 217
 218     prev = timestamp;
 219     i += (len + 9);
 220   }
 221   return 0;
 222 }
 223
 224 int CmdHF14BRead(const char *Cmd)
 225 {
 226   UsbCommand c = {CMD_ACQUIRE_RAW_ADC_SAMPLES_ISO_14443, {strtol(Cmd, NULL, 0), 0, 0}};
 227   SendCommand(&c);
 228   return 0;
 229 }
 230
 231 int CmdHF14Sim(const char *Cmd)
 232 {
 233   UsbCommand c={CMD_SIMULATE_TAG_ISO_14443};
 234   SendCommand(&c);
 235   return 0;
 236 }
 237
 238 int CmdHFSimlisten(const char *Cmd)
 239 {
 240   UsbCommand c = {CMD_SIMULATE_TAG_HF_LISTEN};
 241   SendCommand(&c);
 242   return 0;
 243 }
 244
 245 int CmdHF14BSnoop(const char *Cmd)
 246 {
 247   UsbCommand c = {CMD_SNOOP_ISO_14443};
 248   SendCommand(&c);
 249   return 0;
 250 }
 251
 252 /* New command to read the contents of a SRI512 tag
 253  * SRI512 tags are ISO14443-B modulated memory tags,
 254  * this command just dumps the contents of the memory
 255  */
 256 int CmdSri512Read(const char *Cmd)
 257 {
 258   UsbCommand c = {CMD_READ_SRI512_TAG, {strtol(Cmd, NULL, 0), 0, 0}};
 259   SendCommand(&c);
 260   return 0;
 261 }
 262
 263 /* New command to read the contents of a SRIX4K tag
 264  * SRIX4K tags are ISO14443-B modulated memory tags,
 265  * this command just dumps the contents of the memory/
 266  */
 267 int CmdSrix4kRead(const char *Cmd)
 268 {
 269   UsbCommand c = {CMD_READ_SRIX4K_TAG, {strtol(Cmd, NULL, 0), 0, 0}};
 270   SendCommand(&c);
 271   return 0;
 272 }
 273
 274 int CmdHF14BCmdRaw (const char *cmd) {
 275     UsbCommand resp;
 276     uint8_t *recv;
 277     UsbCommand c = {CMD_ISO_14443B_COMMAND, {0, 0, 0}}; // len,recv?
 278     uint8_t reply=1;
 279     uint8_t crc=0;
 280     uint8_t power=0;
 281     char buf[5]="";
 282     int i=0;
 283     uint8_t data[100];
 284     unsigned int datalen=0, temp;
 285     char *hexout;
 286
 287     if (strlen(cmd)<3) {
 288         PrintAndLog("Usage: hf 14b raw [-r] [-c] [-p] <0A 0B 0C ... hex>");
 289         PrintAndLog("       -r    do not read response");
 290         PrintAndLog("       -c    calculate and append CRC");
 291         PrintAndLog("       -p    leave the field on after receive");
 292         return 0;
 293     }
 294
 295     // strip
 296     while (*cmd==' ' || *cmd=='\t') cmd++;
 297
 298     while (cmd[i]!='\0') {
 299         if (cmd[i]==' ' || cmd[i]=='\t') { i++; continue; }
 300         if (cmd[i]=='-') {
 301             switch (cmd[i+1]) {
 302                 case 'r':
 303                 case 'R':
 304                     reply=0;
 305                     break;
 306                 case 'c':
 307                 case 'C':
 308                     crc=1;
 309                     break;
 310                 case 'p':
 311                 case 'P':
 312                     power=1;
 313                     break;
 314                 default:
 315                     PrintAndLog("Invalid option");
 316                     return 0;
 317             }
 318             i+=2;
 319             continue;
 320         }
 321         if ((cmd[i]>='0' && cmd[i]<='9') ||
 322             (cmd[i]>='a' && cmd[i]<='f') ||
 323             (cmd[i]>='A' && cmd[i]<='F') ) {
 324             buf[strlen(buf)+1]=0;
 325             buf[strlen(buf)]=cmd[i];
 326             i++;
 327
 328             if (strlen(buf)>=2) {
 329                 sscanf(buf,"%x",&temp);
 330                 data[datalen]=(uint8_t)(temp & 0xff);
 331                 datalen++;
 332                 *buf=0;
 333             }
 334             continue;
 335         }
 336         PrintAndLog("Invalid char on input");
 337         return 0;
 338     }
 339     if (datalen == 0)
 340     {
 341       PrintAndLog("Missing data input");
 342       return 0;
 343     }
 344     if(crc)
 345     {
 346         uint8_t first, second;
 347         ComputeCrc14443(CRC_14443_B, data, datalen, &first, &second);
 348         data[datalen++] = first;
 349         data[datalen++] = second;
 350     }
 351
 352     c.arg[0] = datalen;
 353     c.arg[1] = reply;
 354     c.arg[2] = power;
 355     memcpy(c.d.asBytes,data,datalen);
 356
 357     SendCommand(&c);
 358
 359     if (reply) {
 360         if (WaitForResponseTimeout(CMD_ACK,&resp,1000)) {
 361             recv = resp.d.asBytes;
 362             PrintAndLog("received %i octets",resp.arg[0]);
 363             if(!resp.arg[0])
 364                 return 0;
 365             hexout = (char *)malloc(resp.arg[0] * 3 + 1);
 366             if (hexout != NULL) {
 367                 uint8_t first, second;
 368                 for (int i = 0; i < resp.arg[0]; i++) { // data in hex
 369                     sprintf(&hexout[i * 3], "%02X ", recv[i]);
 370                 }
 371                 PrintAndLog("%s", hexout);
 372                 free(hexout);
 373                 ComputeCrc14443(CRC_14443_B, recv, resp.arg[0]-2, &first, &second);
 374                 if(recv[resp.arg[0]-2]==first && recv[resp.arg[0]-1]==second) {
 375                     PrintAndLog("CRC OK");
 376                 } else {
 377                     PrintAndLog("CRC failed");
 378                 }
 379             } else {
 380                 PrintAndLog("malloc failed your client has low memory?");
 381             }
 382         } else {
 383             PrintAndLog("timeout while waiting for reply.");
 384         }
 385     } // if reply
 386     return 0;
 387 }
 388
 389 static command_t CommandTable[] =
 390 {
 391   {"help",        CmdHelp,        1, "This help"},
 392   {"demod",       CmdHF14BDemod,  1, "Demodulate ISO14443 Type B from tag"},
 393   {"list",        CmdHF14BList,   0, "List ISO 14443 history"},
 394   {"read",        CmdHF14BRead,   0, "Read HF tag (ISO 14443)"},
 395   {"sim",         CmdHF14Sim,     0, "Fake ISO 14443 tag"},
 396   {"simlisten",   CmdHFSimlisten, 0, "Get HF samples as fake tag"},
 397   {"snoop",       CmdHF14BSnoop,  0, "Eavesdrop ISO 14443"},
 398   {"sri512read",  CmdSri512Read,  0, "Read contents of a SRI512 tag"},
 399   {"srix4kread",  CmdSrix4kRead,  0, "Read contents of a SRIX4K tag"},
 400   {"raw",         CmdHF14BCmdRaw, 0, "Send raw hex data to tag"},
 401   {NULL, NULL, 0, NULL}
 402 };
 403
 404 int CmdHF14B(const char *Cmd)
 405 {
 406   CmdsParse(CommandTable, Cmd);
 407   return 0;
 408 }
 409
 410 int CmdHelp(const char *Cmd)
 411 {
 412   CmdsHelp(CommandTable);
 413   return 0;
 414 }