git.zerfleddert.de Git - proxmark3-svn/blob - armsrc/mifaresniff.c

   1 //-----------------------------------------------------------------------------
   2 // Merlok - 2012
   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 // Routines to support mifare classic sniffer.
   9 //-----------------------------------------------------------------------------
  10
  11 #include "mifaresniff.h"
  12 #include "apps.h"
  13
  14 static int sniffState = SNF_INIT;
  15 static uint8_t sniffUIDType;
  16 static uint8_t sniffUID[8];
  17 static uint8_t sniffATQA[2];
  18 static uint8_t sniffSAK;
  19 static uint8_t sniffBuf[16];
  20 static int timerData = 0;
  21
  22
  23 int MfSniffInit(void){
  24         rsamples = 0;
  25         memset(sniffUID, 0x00, 8);
  26         memset(sniffATQA, 0x00, 2);
  27         sniffSAK = 0;
  28         sniffUIDType = SNF_UID_4;
  29
  30         return 0;
  31 }
  32
  33 int MfSniffEnd(void){
  34         UsbCommand ack = {CMD_ACK, {0, 0, 0}};
  35
  36         LED_B_ON();
  37         UsbSendPacket((uint8_t *)&ack, sizeof(UsbCommand));
  38         LED_B_OFF();
  39
  40         return 0;
  41 }
  42
  43 int RAMFUNC MfSniffLogic(const uint8_t * data, int len, uint32_t parity, int bitCnt, int reader) {
  44
  45         if ((len == 1) && (bitCnt = 9) && (data[0] > 0x0F)) {
  46                 sniffState = SNF_INIT;
  47         }
  48
  49         switch (sniffState) {
  50                 case SNF_INIT:{
  51                         if ((reader) && (len == 1) && (bitCnt == 9) && ((data[0] == 0x26) || (data[0] == 0x52))) {
  52                                 sniffUIDType = SNF_UID_4;
  53                                 memset(sniffUID, 0x00, 8);
  54                                 memset(sniffATQA, 0x00, 2);
  55                                 sniffSAK = 0;
  56
  57                                 sniffState = SNF_WUPREQ;
  58                         }
  59                         break;
  60                 }
  61                 case SNF_WUPREQ:{
  62                         if ((!reader) && (len == 2)) {
  63                                 memcpy(sniffATQA, data, 2);
  64
  65                                 sniffState = SNF_ATQA;
  66                         }
  67                         break;
  68                 }
  69                 case SNF_ATQA:{
  70                         if ((reader) && (len == 2) && (data[0] == 0x93) && (data[1] == 0x20)) {
  71                                 sniffState = SNF_ANTICOL1;
  72                         }
  73                         break;
  74                 }
  75                 case SNF_ANTICOL1:{
  76                         if ((!reader) && (len == 5) && ((data[0] ^ data[1] ^ data[2] ^ data[3]) == data[4])) {
  77                                 memcpy(sniffUID + 3, data, 4);
  78
  79                                 sniffState = SNF_UID1;
  80                         }
  81                         break;
  82                 }
  83                 case SNF_UID1:{
  84                         if ((reader) && (len == 9) && (data[0] == 0x93) && (data[1] == 0x70) && (CheckCrc14443(CRC_14443_A, data, 9))) {
  85                                 sniffState = SNF_SAK;
  86                         }
  87                         break;
  88                 }
  89                 case SNF_SAK:{
  90                         if ((!reader) && (len == 3) && (CheckCrc14443(CRC_14443_A, data, 3))) {
  91                                 sniffSAK = data[0];
  92                                 if (sniffUID[3] == 0x88) {
  93                                         sniffState = SNF_ANTICOL2;
  94                                 } else {
  95                                         sniffState = SNF_CARD_IDLE;
  96                                 }
  97                         }
  98                         break;
  99                 }
 100                 case SNF_ANTICOL2:{
 101                         if ((!reader) && (len == 5) && ((data[0] ^ data[1] ^ data[2] ^ data[3]) == data[4])) {
 102                                 memcpy(sniffUID, data, 4);
 103                                 sniffUIDType = SNF_UID_7;
 104
 105                                 sniffState = SNF_UID2;
 106                 }
 107                         break;
 108                 }
 109                 case SNF_UID2:{
 110                         if ((reader) && (len == 9) && (data[0] == 0x95) && (data[1] == 0x70) && (CheckCrc14443(CRC_14443_A, data, 9))) {
 111                                 sniffState = SNF_SAK;
 112         Dbprintf("SNF_SAK");
 113                         }
 114                         break;
 115                 }
 116                 case SNF_CARD_IDLE:{
 117                         sniffBuf[0] = 0xFF;
 118                         sniffBuf[1] = 0xFF;
 119                         memcpy(sniffBuf + 2, sniffUID, 7);
 120                         memcpy(sniffBuf + 9, sniffATQA, 2);
 121                         sniffBuf[11] = sniffSAK;
 122                         sniffBuf[12] = 0xFF;
 123                         sniffBuf[13] = 0xFF;
 124                         LogTrace(sniffBuf, 14, 0, parity, true);
 125                         timerData = GetTickCount();
 126                 }
 127                 case SNF_CARD_CMD:{
 128                         LogTrace(data, len, 0, parity, true);
 129
 130                         sniffState = SNF_CARD_RESP;
 131                         timerData = GetTickCount();
 132                         break;
 133                 }
 134                 case SNF_CARD_RESP:{
 135                         LogTrace(data, len, 0, parity, false);
 136
 137                         sniffState = SNF_CARD_CMD;
 138                         timerData = GetTickCount();
 139                         break;
 140                 }
 141
 142                 default:
 143                         sniffState = SNF_INIT;
 144                 break;
 145         }
 146
 147         return 0;
 148 }
 149
 150 int RAMFUNC MfSniffSend(int maxTimeoutMs) {
 151         if (traceLen && (timerData + maxTimeoutMs < GetTickCount())) {
 152                 return intMfSniffSend();
 153         }
 154         return 0;
 155 }
 156
 157 // internal seding function. not a RAMFUNC.
 158 int intMfSniffSend() {
 159
 160         int pckSize = 0;
 161         int pckLen = traceLen;
 162         int pckNum = 0;
 163
 164         if (!traceLen) return 0;
 165
 166         FpgaDisableSscDma();
 167
 168         while (pckLen > 0) {
 169                 pckSize = MIN(32, pckLen);
 170                 UsbCommand ack = {CMD_ACK, {1, pckSize, pckNum}};
 171                 memcpy(ack.d.asBytes, trace + traceLen - pckLen, pckSize);
 172
 173                 LED_B_ON();
 174                 UsbSendPacket((uint8_t *)&ack, sizeof(UsbCommand));
 175                 SpinDelay(20);
 176                 LED_B_OFF();
 177
 178                 pckLen -= pckSize;
 179                 pckNum++;
 180         }
 181
 182         UsbCommand ack = {CMD_ACK, {2, 0, 0}};
 183
 184         LED_B_ON();
 185         UsbSendPacket((uint8_t *)&ack, sizeof(UsbCommand));
 186         LED_B_OFF();
 187
 188         traceLen = 0;
 189         memset(trace, 0x44, TRACE_SIZE);
 190
 191         return 1;
 192 }