git.zerfleddert.de Git - proxmark3-svn/blob - client/cmdhf14a.c

   1 //-----------------------------------------------------------------------------
   2 // Copyright (C) 2010 iZsh <izsh at fail0verflow.com>, Hagen Fritsch
   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 ISO14443A commands
   9 //-----------------------------------------------------------------------------
  10
  11 #include <stdio.h>
  12 #include <stdlib.h>
  13 #include <string.h>
  14 #include "iso14443crc.h"
  15 #include "data.h"
  16 #include "proxusb.h"
  17 #include "ui.h"
  18 #include "cmdparser.h"
  19 #include "cmdhf14a.h"
  20 #include "common.h"
  21
  22 static int CmdHelp(const char *Cmd);
  23
  24 int CmdHF14AList(const char *Cmd)
  25 {
  26   uint8_t got[1920];
  27   GetFromBigBuf(got, sizeof(got));
  28
  29   PrintAndLog("recorded activity:");
  30   PrintAndLog(" ETU     :rssi: who bytes");
  31   PrintAndLog("---------+----+----+-----------");
  32
  33   int i = 0;
  34   int prev = -1;
  35
  36   for (;;) {
  37     if(i >= 1900) {
  38       break;
  39     }
  40
  41     bool isResponse;
  42     int timestamp = *((uint32_t *)(got+i));
  43     if (timestamp & 0x80000000) {
  44       timestamp &= 0x7fffffff;
  45       isResponse = 1;
  46     } else {
  47       isResponse = 0;
  48     }
  49
  50     int metric = 0;
  51     int parityBits = *((uint32_t *)(got+i+4));
  52     // 4 bytes of additional information...
  53     // maximum of 32 additional parity bit information
  54     //
  55     // TODO:
  56     // at each quarter bit period we can send power level (16 levels)
  57     // or each half bit period in 256 levels.
  58
  59
  60     int len = got[i+8];
  61
  62     if (len > 100) {
  63       break;
  64     }
  65     if (i + len >= 1900) {
  66       break;
  67     }
  68
  69     uint8_t *frame = (got+i+9);
  70
  71     // Break and stick with current result if buffer was not completely full
  72     if (frame[0] == 0x44 && frame[1] == 0x44 && frame[3] == 0x44) { break; }
  73
  74     char line[1000] = "";
  75     int j;
  76     for (j = 0; j < len; j++) {
  77       int oddparity = 0x01;
  78       int k;
  79
  80       for (k=0;k<8;k++) {
  81         oddparity ^= (((frame[j] & 0xFF) >> k) & 0x01);
  82       }
  83
  84       //if((parityBits >> (len - j - 1)) & 0x01) {
  85       if (isResponse && (oddparity != ((parityBits >> (len - j - 1)) & 0x01))) {
  86         sprintf(line+(j*4), "%02x!  ", frame[j]);
  87       }
  88       else {
  89         sprintf(line+(j*4), "%02x   ", frame[j]);
  90       }
  91     }
  92
  93     char *crc;
  94     crc = "";
  95     if (len > 2) {
  96       uint8_t b1, b2;
  97       for (j = 0; j < (len - 1); j++) {
  98         // gives problems... search for the reason..
  99         /*if(frame[j] == 0xAA) {
 100           switch(frame[j+1]) {
 101             case 0x01:
 102               crc = "[1] Two drops close after each other";
 103             break;
 104             case 0x02:
 105               crc = "[2] Potential SOC with a drop in second half of bitperiod";
 106               break;
 107             case 0x03:
 108               crc = "[3] Segment Z after segment X is not possible";
 109               break;
 110             case 0x04:
 111               crc = "[4] Parity bit of a fully received byte was wrong";
 112               break;
 113             default:
 114               crc = "[?] Unknown error";
 115               break;
 116           }
 117           break;
 118         }*/
 119       }
 120
 121       if (strlen(crc)==0) {
 122         ComputeCrc14443(CRC_14443_A, frame, len-2, &b1, &b2);
 123         if (b1 != frame[len-2] || b2 != frame[len-1]) {
 124           crc = (isResponse & (len < 6)) ? "" : " !crc";
 125         } else {
 126           crc = "";
 127         }
 128       }
 129     } else {
 130       crc = ""; // SHORT
 131     }
 132
 133     char metricString[100];
 134     if (isResponse) {
 135       sprintf(metricString, "%3d", metric);
 136     } else {
 137       strcpy(metricString, "   ");
 138     }
 139
 140     PrintAndLog(" +%7d: %s: %s %s %s",
 141       (prev < 0 ? 0 : (timestamp - prev)),
 142       metricString,
 143       (isResponse ? "TAG" : "   "), line, crc);
 144
 145     prev = timestamp;
 146     i += (len + 9);
 147   }
 148   return 0;
 149 }
 150
 151 void iso14a_set_timeout(uint32_t timeout) {
 152         UsbCommand c = {CMD_READER_ISO_14443a, {ISO14A_SET_TIMEOUT, 0, timeout}};
 153         SendCommand(&c);
 154 }
 155
 156 int CmdHF14AMifare(const char *Cmd)
 157 {
 158   UsbCommand c = {CMD_READER_MIFARE, {strtol(Cmd, NULL, 0), 0, 0}};
 159   SendCommand(&c);
 160   return 0;
 161 }
 162
 163 int CmdHF14AReader(const char *Cmd)
 164 {
 165         UsbCommand c = {CMD_READER_ISO_14443a, {ISO14A_CONNECT, 0, 0}};
 166         SendCommand(&c);
 167         UsbCommand * resp = WaitForResponse(CMD_ACK);
 168         uint8_t              * uid  = resp->d.asBytes;
 169         iso14a_card_select_t * card = uid + 12;
 170
 171         if(resp->arg[0] == 0) {
 172                 PrintAndLog("iso14443a card select failed");
 173                 return 0;
 174         }
 175
 176         PrintAndLog("ATQA : %02x %02x", card->atqa[0], card->atqa[1]);
 177         PrintAndLog(" UID : %s", sprint_hex(uid, 12));
 178         PrintAndLog(" SAK : %02x [%d]", card->sak, resp->arg[0]);
 179         if(resp->arg[0] == 1)
 180                 PrintAndLog(" ATS : %s", sprint_hex(card->ats, card->ats_len));
 181         else
 182                 PrintAndLog("proprietary non-iso14443a card found, RATS not supported");
 183
 184         return resp->arg[0];
 185 }
 186
 187 // ## simulate iso14443a tag
 188 // ## greg - added ability to specify tag UID
 189 int CmdHF14ASim(const char *Cmd)
 190 {
 191
 192   unsigned int hi = 0, lo = 0;
 193   int n = 0, i = 0;
 194   while (sscanf(&Cmd[i++], "%1x", &n ) == 1) {
 195     hi= (hi << 4) | (lo >> 28);
 196     lo= (lo << 4) | (n & 0xf);
 197   }
 198
 199   // c.arg should be set to *Cmd or convert *Cmd to the correct format for a uid
 200   UsbCommand c = {CMD_SIMULATE_TAG_ISO_14443a, {hi, lo, 0}};
 201   PrintAndLog("Emulating 14443A TAG with UID %x%16x", hi, lo);
 202   SendCommand(&c);
 203   return 0;
 204 }
 205
 206 int CmdHF14ASnoop(const char *Cmd)
 207 {
 208   UsbCommand c = {CMD_SNOOP_ISO_14443a};
 209   SendCommand(&c);
 210   return 0;
 211 }
 212
 213 static command_t CommandTable[] =
 214 {
 215   {"help",    CmdHelp,        1, "This help"},
 216   {"list",    CmdHF14AList,   0, "List ISO 14443a history"},
 217   {"mifare",  CmdHF14AMifare, 0, "Read out sector 0 parity error messages"},
 218   {"reader",  CmdHF14AReader, 0, "Act like an ISO14443 Type A reader"},
 219   {"sim",     CmdHF14ASim,    0, "<UID> -- Fake ISO 14443a tag"},
 220   {"snoop",   CmdHF14ASnoop,  0, "Eavesdrop ISO 14443 Type A"},
 221   {NULL, NULL, 0, NULL}
 222 };
 223
 224 int CmdHF14A(const char *Cmd)
 225 {
 226   CmdsParse(CommandTable, Cmd);
 227   return 0;
 228 }
 229
 230 int CmdHelp(const char *Cmd)
 231 {
 232   CmdsHelp(CommandTable);
 233   return 0;
 234 }