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         // Break and stick with current result if buffer was not completely full
 186         if (frame[0] == 0x44 && frame[1] == 0x44 && frame[2] == 0x44 && frame[3] == 0x44) break;
 187
 188     char line[1000] = "";
 189     int j;
 190     for(j = 0; j < len; j++) {
 191       sprintf(line+(j*3), "%02x  ", frame[j]);
 192     }
 193
 194     char *crc;
 195     if(len > 2) {
 196       uint8_t b1, b2;
 197       ComputeCrc14443(CRC_14443_B, frame, len-2, &b1, &b2);
 198       if(b1 != frame[len-2] || b2 != frame[len-1]) {
 199         crc = "**FAIL CRC**";
 200       } else {
 201         crc = "";
 202       }
 203     } else {
 204       crc = "(SHORT)";
 205     }
 206
 207     char metricString[100];
 208     if(isResponse) {
 209       sprintf(metricString, "%3d", metric);
 210     } else {
 211       strcpy(metricString, "   ");
 212     }
 213
 214     PrintAndLog(" +%7d: %s: %s %s %s",
 215       (prev < 0 ? 0 : timestamp - prev),
 216       metricString,
 217       (isResponse ? "TAG" : "   "), line, crc);
 218
 219     prev = timestamp;
 220     i += (len + 9);
 221   }
 222   return 0;
 223 }
 224
 225 int CmdHF14BRead(const char *Cmd)
 226 {
 227   UsbCommand c = {CMD_ACQUIRE_RAW_ADC_SAMPLES_ISO_14443, {strtol(Cmd, NULL, 0), 0, 0}};
 228   SendCommand(&c);
 229   return 0;
 230 }
 231
 232 int CmdHF14Sim(const char *Cmd)
 233 {
 234   UsbCommand c={CMD_SIMULATE_TAG_ISO_14443};
 235   SendCommand(&c);
 236   return 0;
 237 }
 238
 239 int CmdHFSimlisten(const char *Cmd)
 240 {
 241   UsbCommand c = {CMD_SIMULATE_TAG_HF_LISTEN};
 242   SendCommand(&c);
 243   return 0;
 244 }
 245
 246 int CmdHF14BSnoop(const char *Cmd)
 247 {
 248   UsbCommand c = {CMD_SNOOP_ISO_14443};
 249   SendCommand(&c);
 250   return 0;
 251 }
 252
 253 /* New command to read the contents of a SRI512 tag
 254  * SRI512 tags are ISO14443-B modulated memory tags,
 255  * this command just dumps the contents of the memory
 256  */
 257 int CmdSri512Read(const char *Cmd)
 258 {
 259   UsbCommand c = {CMD_READ_SRI512_TAG, {strtol(Cmd, NULL, 0), 0, 0}};
 260   SendCommand(&c);
 261   return 0;
 262 }
 263
 264 /* New command to read the contents of a SRIX4K tag
 265  * SRIX4K tags are ISO14443-B modulated memory tags,
 266  * this command just dumps the contents of the memory/
 267  */
 268 int CmdSrix4kRead(const char *Cmd)
 269 {
 270   UsbCommand c = {CMD_READ_SRIX4K_TAG, {strtol(Cmd, NULL, 0), 0, 0}};
 271   SendCommand(&c);
 272   return 0;
 273 }
 274
 275 int CmdHF14BCmdRaw (const char *cmd) {
 276     UsbCommand resp;
 277     uint8_t *recv;
 278     UsbCommand c = {CMD_ISO_14443B_COMMAND, {0, 0, 0}}; // len,recv?
 279     uint8_t reply=1;
 280     uint8_t crc=0;
 281     uint8_t power=0;
 282     char buf[5]="";
 283     int i=0;
 284     uint8_t data[100];
 285     unsigned int datalen=0, temp;
 286     char *hexout;
 287
 288     if (strlen(cmd)<3) {
 289         PrintAndLog("Usage: hf 14b raw [-r] [-c] [-p] <0A 0B 0C ... hex>");
 290         PrintAndLog("       -r    do not read response");
 291         PrintAndLog("       -c    calculate and append CRC");
 292         PrintAndLog("       -p    leave the field on after receive");
 293         return 0;
 294     }
 295
 296     // strip
 297     while (*cmd==' ' || *cmd=='\t') cmd++;
 298
 299     while (cmd[i]!='\0') {
 300         if (cmd[i]==' ' || cmd[i]=='\t') { i++; continue; }
 301         if (cmd[i]=='-') {
 302             switch (cmd[i+1]) {
 303                 case 'r':
 304                 case 'R':
 305                     reply=0;
 306                     break;
 307                 case 'c':
 308                 case 'C':
 309                     crc=1;
 310                     break;
 311                 case 'p':
 312                 case 'P':
 313                     power=1;
 314                     break;
 315                 default:
 316                     PrintAndLog("Invalid option");
 317                     return 0;
 318             }
 319             i+=2;
 320             continue;
 321         }
 322         if ((cmd[i]>='0' && cmd[i]<='9') ||
 323             (cmd[i]>='a' && cmd[i]<='f') ||
 324             (cmd[i]>='A' && cmd[i]<='F') ) {
 325             buf[strlen(buf)+1]=0;
 326             buf[strlen(buf)]=cmd[i];
 327             i++;
 328
 329             if (strlen(buf)>=2) {
 330                 sscanf(buf,"%x",&temp);
 331                 data[datalen]=(uint8_t)(temp & 0xff);
 332                 datalen++;
 333                 *buf=0;
 334             }
 335             continue;
 336         }
 337         PrintAndLog("Invalid char on input");
 338         return 0;
 339     }
 340     if (datalen == 0)
 341     {
 342       PrintAndLog("Missing data input");
 343       return 0;
 344     }
 345     if(crc)
 346     {
 347         uint8_t first, second;
 348         ComputeCrc14443(CRC_14443_B, data, datalen, &first, &second);
 349         data[datalen++] = first;
 350         data[datalen++] = second;
 351     }
 352
 353     c.arg[0] = datalen;
 354     c.arg[1] = reply;
 355     c.arg[2] = power;
 356     memcpy(c.d.asBytes,data,datalen);
 357
 358     SendCommand(&c);
 359
 360     if (reply) {
 361         if (WaitForResponseTimeout(CMD_ACK,&resp,1000)) {
 362             recv = resp.d.asBytes;
 363             PrintAndLog("received %i octets",resp.arg[0]);
 364             if(!resp.arg[0])
 365                 return 0;
 366             hexout = (char *)malloc(resp.arg[0] * 3 + 1);
 367             if (hexout != NULL) {
 368                 uint8_t first, second;
 369                 for (int i = 0; i < resp.arg[0]; i++) { // data in hex
 370                     sprintf(&hexout[i * 3], "%02X ", recv[i]);
 371                 }
 372                 PrintAndLog("%s", hexout);
 373                 free(hexout);
 374                 ComputeCrc14443(CRC_14443_B, recv, resp.arg[0]-2, &first, &second);
 375                 if(recv[resp.arg[0]-2]==first && recv[resp.arg[0]-1]==second) {
 376                     PrintAndLog("CRC OK");
 377                 } else {
 378                     PrintAndLog("CRC failed");
 379                 }
 380             } else {
 381                 PrintAndLog("malloc failed your client has low memory?");
 382             }
 383         } else {
 384             PrintAndLog("timeout while waiting for reply.");
 385         }
 386     } // if reply
 387     return 0;
 388 }
 389
 390 static command_t CommandTable[] =
 391 {
 392   {"help",        CmdHelp,        1, "This help"},
 393   {"demod",       CmdHF14BDemod,  1, "Demodulate ISO14443 Type B from tag"},
 394   {"list",        CmdHF14BList,   0, "List ISO 14443 history"},
 395   {"read",        CmdHF14BRead,   0, "Read HF tag (ISO 14443)"},
 396   {"sim",         CmdHF14Sim,     0, "Fake ISO 14443 tag"},
 397   {"simlisten",   CmdHFSimlisten, 0, "Get HF samples as fake tag"},
 398   {"snoop",       CmdHF14BSnoop,  0, "Eavesdrop ISO 14443"},
 399   {"sri512read",  CmdSri512Read,  0, "Read contents of a SRI512 tag"},
 400   {"srix4kread",  CmdSrix4kRead,  0, "Read contents of a SRIX4K tag"},
 401   {"raw",         CmdHF14BCmdRaw, 0, "Send raw hex data to tag"},
 402   {NULL, NULL, 0, NULL}
 403 };
 404
 405 int CmdHF14B(const char *Cmd)
 406 {
 407   CmdsParse(CommandTable, Cmd);
 408   return 0;
 409 }
 410
 411 int CmdHelp(const char *Cmd)
 412 {
 413   CmdsHelp(CommandTable);
 414   return 0;
 415 }