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 "proxmark3.h"
  18 #include "data.h"
  19 #include "graph.h"
  20 #include "util.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         PrintAndLog("Deprecated command, use 'hf list 14b' instead");
 149
 150         return 0;
 151 }
 152 int CmdHF14BRead(const char *Cmd)
 153 {
 154   UsbCommand c = {CMD_ACQUIRE_RAW_ADC_SAMPLES_ISO_14443, {strtol(Cmd, NULL, 0), 0, 0}};
 155   SendCommand(&c);
 156   return 0;
 157 }
 158
 159 int CmdHF14Sim(const char *Cmd)
 160 {
 161   UsbCommand c={CMD_SIMULATE_TAG_ISO_14443};
 162   SendCommand(&c);
 163   return 0;
 164 }
 165
 166 int CmdHFSimlisten(const char *Cmd)
 167 {
 168   UsbCommand c = {CMD_SIMULATE_TAG_HF_LISTEN};
 169   SendCommand(&c);
 170   return 0;
 171 }
 172
 173 int CmdHF14BSnoop(const char *Cmd)
 174 {
 175   UsbCommand c = {CMD_SNOOP_ISO_14443};
 176   SendCommand(&c);
 177   return 0;
 178 }
 179
 180 /* New command to read the contents of a SRI512 tag
 181  * SRI512 tags are ISO14443-B modulated memory tags,
 182  * this command just dumps the contents of the memory
 183  */
 184 int CmdSri512Read(const char *Cmd)
 185 {
 186   UsbCommand c = {CMD_READ_SRI512_TAG, {strtol(Cmd, NULL, 0), 0, 0}};
 187   SendCommand(&c);
 188   return 0;
 189 }
 190
 191 /* New command to read the contents of a SRIX4K tag
 192  * SRIX4K tags are ISO14443-B modulated memory tags,
 193  * this command just dumps the contents of the memory/
 194  */
 195 int CmdSrix4kRead(const char *Cmd)
 196 {
 197   UsbCommand c = {CMD_READ_SRIX4K_TAG, {strtol(Cmd, NULL, 0), 0, 0}};
 198   SendCommand(&c);
 199   return 0;
 200 }
 201
 202 int CmdHF14BCmdRaw (const char *cmd) {
 203     UsbCommand resp;
 204     uint8_t *recv;
 205     UsbCommand c = {CMD_ISO_14443B_COMMAND, {0, 0, 0}}; // len,recv?
 206     uint8_t reply=1;
 207     uint8_t crc=0;
 208     uint8_t power=0;
 209     char buf[5]="";
 210     int i=0;
 211     uint8_t data[100] = {0x00};
 212     unsigned int datalen=0, temp;
 213     char *hexout;
 214
 215     if (strlen(cmd)<3) {
 216         PrintAndLog("Usage: hf 14b raw [-r] [-c] [-p] <0A 0B 0C ... hex>");
 217         PrintAndLog("       -r    do not read response");
 218         PrintAndLog("       -c    calculate and append CRC");
 219         PrintAndLog("       -p    leave the field on after receive");
 220         return 0;
 221     }
 222
 223     // strip
 224     while (*cmd==' ' || *cmd=='\t') cmd++;
 225
 226     while (cmd[i]!='\0') {
 227         if (cmd[i]==' ' || cmd[i]=='\t') { i++; continue; }
 228         if (cmd[i]=='-') {
 229             switch (cmd[i+1]) {
 230                 case 'r':
 231                 case 'R':
 232                     reply=0;
 233                     break;
 234                 case 'c':
 235                 case 'C':
 236                     crc=1;
 237                     break;
 238                 case 'p':
 239                 case 'P':
 240                     power=1;
 241                     break;
 242                 default:
 243                     PrintAndLog("Invalid option");
 244                     return 0;
 245             }
 246             i+=2;
 247             continue;
 248         }
 249         if ((cmd[i]>='0' && cmd[i]<='9') ||
 250             (cmd[i]>='a' && cmd[i]<='f') ||
 251             (cmd[i]>='A' && cmd[i]<='F') ) {
 252             buf[strlen(buf)+1]=0;
 253             buf[strlen(buf)]=cmd[i];
 254             i++;
 255
 256             if (strlen(buf)>=2) {
 257                 sscanf(buf,"%x",&temp);
 258                 data[datalen]=(uint8_t)(temp & 0xff);
 259                 datalen++;
 260                 *buf=0;
 261             }
 262             continue;
 263         }
 264         PrintAndLog("Invalid char on input");
 265         return 1;
 266     }
 267     if (datalen == 0)
 268     {
 269       PrintAndLog("Missing data input");
 270       return 0;
 271     }
 272     if(crc)
 273     {
 274         uint8_t first, second;
 275         ComputeCrc14443(CRC_14443_B, data, datalen, &first, &second);
 276         data[datalen++] = first;
 277         data[datalen++] = second;
 278     }
 279
 280     c.arg[0] = datalen;
 281     c.arg[1] = reply;
 282     c.arg[2] = power;
 283     memcpy(c.d.asBytes,data,datalen);
 284
 285     SendCommand(&c);
 286
 287     if (reply) {
 288         if (WaitForResponseTimeout(CMD_ACK,&resp,1000)) {
 289             recv = resp.d.asBytes;
 290             PrintAndLog("received %i octets",resp.arg[0]);
 291             if(!resp.arg[0])
 292                 return 0;
 293             hexout = (char *)malloc(resp.arg[0] * 3 + 1);
 294             if (hexout != NULL) {
 295                 uint8_t first, second;
 296                 for (int i = 0; i < resp.arg[0]; i++) { // data in hex
 297                     sprintf(&hexout[i * 3], "%02X ", recv[i]);
 298                 }
 299                 PrintAndLog("%s", hexout);
 300                 free(hexout);
 301                 ComputeCrc14443(CRC_14443_B, recv, resp.arg[0]-2, &first, &second);
 302                 if(recv[resp.arg[0]-2]==first && recv[resp.arg[0]-1]==second) {
 303                     PrintAndLog("CRC OK");
 304                 } else {
 305                     PrintAndLog("CRC failed");
 306                 }
 307             } else {
 308                 PrintAndLog("malloc failed your client has low memory?");
 309             }
 310         } else {
 311             PrintAndLog("timeout while waiting for reply.");
 312         }
 313     } // if reply
 314     return 0;
 315 }
 316
 317 int CmdHF14BWrite( const char *Cmd){
 318
 319 /*
 320  * For SRIX4K  blocks 00 - 7F
 321  * hf 14b raw -c -p 09 $srix4kwblock $srix4kwdata
 322  *
 323  * For SR512  blocks 00 - 0F
 324  * hf 14b raw -c -p 09 $sr512wblock $sr512wdata
 325  *
 326  * Special block FF =  otp_lock_reg block.
 327  * Data len 4 bytes-
 328  */
 329         char cmdp = param_getchar(Cmd, 0);
 330         uint8_t blockno = -1;
 331         uint8_t data[4] = {0x00};
 332         bool isSrix4k = true;
 333         char str[20];
 334
 335         if (strlen(Cmd) < 1 || cmdp == 'h' || cmdp == 'H') {
 336                 PrintAndLog("Usage:  hf 14b write <1|2> <BLOCK> <DATA>");
 337                 PrintAndLog("    [1 = SRIX4K]");
 338                 PrintAndLog("    [2 = SRI512]");
 339                 PrintAndLog("    [BLOCK number depends on tag, special block == FF]");
 340                 PrintAndLog("     sample: hf 14b write 1 7F 11223344");
 341                 PrintAndLog("           : hf 14b write 1 FF 11223344");
 342                 PrintAndLog("           : hf 14b write 2 15 11223344");
 343                 PrintAndLog("           : hf 14b write 2 FF 11223344");
 344                 return 0;
 345         }
 346
 347         if ( cmdp == '2' )
 348                 isSrix4k = false;
 349
 350         //blockno = param_get8(Cmd, 1);
 351
 352         if ( param_gethex(Cmd,1, &blockno, 2) ) {
 353                 PrintAndLog("Block number must include 2 HEX symbols");
 354                 return 0;
 355         }
 356
 357         if ( isSrix4k ){
 358                 if ( blockno > 0x7f && blockno != 0xff ){
 359                         PrintAndLog("Block number out of range");
 360                         return 0;
 361                 }
 362         } else {
 363                 if ( blockno > 0x0f && blockno != 0xff ){
 364                         PrintAndLog("Block number out of range");
 365                         return 0;
 366                 }
 367         }
 368
 369         if (param_gethex(Cmd, 2, data, 8)) {
 370                 PrintAndLog("Data must include 8 HEX symbols");
 371                 return 0;
 372         }
 373
 374         if ( blockno == 0xff)
 375                 PrintAndLog("[%s] Write special block %02X [ %s ]", (isSrix4k)?"SRIX4K":"SRI512" , blockno,  sprint_hex(data,4) );
 376         else
 377                 PrintAndLog("[%s] Write block %02X [ %s ]", (isSrix4k)?"SRIX4K":"SRI512", blockno,  sprint_hex(data,4) );
 378
 379         sprintf(str, "-c 09 %02x %02x%02x%02x%02x", blockno, data[0], data[1], data[2], data[3]);
 380
 381         CmdHF14BCmdRaw(str);
 382         return 0;
 383 }
 384
 385 static command_t CommandTable[] =
 386 {
 387   {"help",        CmdHelp,        1, "This help"},
 388   {"demod",       CmdHF14BDemod,  1, "Demodulate ISO14443 Type B from tag"},
 389   {"list",        CmdHF14BList,   0, "[Deprecated] List ISO 14443b history"},
 390   {"read",        CmdHF14BRead,   0, "Read HF tag (ISO 14443)"},
 391   {"sim",         CmdHF14Sim,     0, "Fake ISO 14443 tag"},
 392   {"simlisten",   CmdHFSimlisten, 0, "Get HF samples as fake tag"},
 393   {"snoop",       CmdHF14BSnoop,  0, "Eavesdrop ISO 14443"},
 394   {"sri512read",  CmdSri512Read,  0, "Read contents of a SRI512 tag"},
 395   {"srix4kread",  CmdSrix4kRead,  0, "Read contents of a SRIX4K tag"},
 396   {"raw",         CmdHF14BCmdRaw, 0, "Send raw hex data to tag"},
 397   {"write",       CmdHF14BWrite,  0, "Write data to a SRI512 | SRIX4K tag"},
 398   {NULL, NULL, 0, NULL}
 399 };
 400
 401 int CmdHF14B(const char *Cmd)
 402 {
 403   CmdsParse(CommandTable, Cmd);
 404   return 0;
 405 }
 406
 407 int CmdHelp(const char *Cmd)
 408 {
 409   CmdsHelp(CommandTable);
 410   return 0;
 411 }