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