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 #include "proxmark3.h"
  14 #include "util.h"
  15 #include "string.h"
  16 #include "iso14443crc.h"
  17 #include "iso14443a.h"
  18 #include "crapto1/crapto1.h"
  19 #include "mifareutil.h"
  20 #include "common.h"
  21
  22
  23 static int sniffState = SNF_INIT;
  24 static uint8_t sniffUIDType;
  25 static uint8_t sniffUID[8] = {0x00};
  26 static uint8_t sniffATQA[2] = {0x00};
  27 static uint8_t sniffSAK;
  28 static uint8_t sniffBuf[16] = {0x00};
  29 static uint32_t timerData = 0;
  30
  31
  32 bool MfSniffInit(void){
  33         memset(sniffUID, 0x00, 8);
  34         memset(sniffATQA, 0x00, 2);
  35         sniffSAK = 0;
  36         sniffUIDType = SNF_UID_4;
  37
  38         return FALSE;
  39 }
  40
  41 bool MfSniffEnd(void){
  42         LED_B_ON();
  43         cmd_send(CMD_ACK,0,0,0,0,0);
  44         LED_B_OFF();
  45
  46         return FALSE;
  47 }
  48
  49 bool RAMFUNC MfSniffLogic(const uint8_t *data, uint16_t len, uint8_t *parity, uint16_t bitCnt, bool reader) {
  50
  51         if (reader && (len == 1) && (bitCnt == 7)) {            // reset on 7-Bit commands from reader
  52                 sniffState = SNF_INIT;
  53         }
  54
  55         switch (sniffState) {
  56                 case SNF_INIT:{
  57                         if ((len == 1) && (reader) && (bitCnt == 7) ) {  // REQA or WUPA from reader
  58                                 sniffUIDType = SNF_UID_4;
  59                                 memset(sniffUID, 0x00, 8);
  60                                 memset(sniffATQA, 0x00, 2);
  61                                 sniffSAK = 0;
  62                                 sniffState = SNF_WUPREQ;
  63                         }
  64                         break;
  65                 }
  66                 case SNF_WUPREQ:{
  67                         if ((!reader) && (len == 2)) {          // ATQA from tag
  68                                 memcpy(sniffATQA, data, 2);
  69                                 sniffState = SNF_ATQA;
  70                         }
  71                         break;
  72                 }
  73                 case SNF_ATQA:
  74                 case SNF_UID1:{
  75                         // SNF_ATQA
  76                         if ((reader) && (len == 2) && (data[0] == 0x93) && (data[1] == 0x20)) { // Select ALL from reader
  77                                 sniffState = SNF_ANTICOL1;
  78                         }
  79
  80                         // SNF_UID1
  81                         if ((reader) && (len == 9) && (data[0] == 0x93) && (data[1] == 0x70) && (CheckCrc14443(CRC_14443_A, data, 9))) {   // Select 4 Byte UID from reader
  82                                 memcpy(sniffUID + 3, &data[2], 4);
  83                                 sniffState = SNF_SAK;
  84                         }
  85                         break;
  86                 }
  87                 case SNF_ANTICOL1:{
  88                         if ((!reader) && (len == 5) && ((data[0] ^ data[1] ^ data[2] ^ data[3]) == data[4])) {  // UID from tag (CL1)
  89                                 sniffState = SNF_UID1;
  90                         }
  91                         break;
  92                 }
  93                 case SNF_SAK:{
  94                         if ((!reader) && (len == 3) && (CheckCrc14443(CRC_14443_A, data, 3))) { // SAK from card?
  95                                 sniffSAK = data[0];
  96                                 if ((sniffUID[3] == 0x88) && (sniffUIDType == SNF_UID_4)) {                     // CL2 UID part to be expected
  97                                         sniffUIDType = SNF_UID_7;
  98                                         memcpy(sniffUID, sniffUID + 4, 3);
  99                                         sniffState = SNF_UID2;
 100                                 } else {                                                                                                                        // select completed
 101                                         sniffState = SNF_CARD_IDLE;
 102                                 }
 103                         }
 104                         break;
 105                 }
 106                 case SNF_ANTICOL2:{
 107                         if ((!reader) && (len == 5) && ((data[0] ^ data[1] ^ data[2] ^ data[3]) == data[4])) { // CL2 UID
 108                                 sniffState = SNF_UID2;
 109                         }
 110                         break;
 111                 }
 112                 case SNF_UID2:{
 113                         if ((reader) && (len == 2) && (data[0] == 0x95) && (data[1] == 0x20)) {
 114                                 sniffState = SNF_ANTICOL2;
 115                         }
 116
 117                         if ((reader) && (len == 9) && (data[0] == 0x95) && (data[1] == 0x70) && (CheckCrc14443(CRC_14443_A, data, 9))) {
 118                                 memcpy(sniffUID + 3, &data[2], 4);
 119                                 sniffState = SNF_SAK;
 120                         }
 121                         break;
 122                 }
 123                 case SNF_CARD_IDLE:{    // trace the card select sequence
 124                         sniffBuf[0] = 0xFF;
 125                         sniffBuf[1] = 0xFF;
 126                         memcpy(sniffBuf + 2, sniffUID, 7);
 127                         memcpy(sniffBuf + 9, sniffATQA, 2);
 128                         sniffBuf[11] = sniffSAK;
 129                         sniffBuf[12] = 0xFF;
 130                         sniffBuf[13] = 0xFF;
 131                         LogTrace(sniffBuf, 14, 0, 0, NULL, TRUE);
 132                         sniffState = SNF_CARD_CMD;
 133                 }       // intentionally no break;
 134                 case SNF_CARD_CMD:{
 135                         LogTrace(data, len, 0, 0, NULL, reader);
 136                         timerData = GetTickCount();
 137                         break;
 138                 }
 139
 140                 default:
 141                         sniffState = SNF_INIT;
 142                 break;
 143         }
 144
 145
 146         return FALSE;
 147 }
 148
 149 bool RAMFUNC MfSniffSend(uint16_t maxTimeoutMs) {
 150         if (BigBuf_get_traceLen() && (GetTickCount() > timerData + maxTimeoutMs)) {
 151                 return intMfSniffSend();
 152         }
 153         return FALSE;
 154 }
 155
 156 // internal sending function. not a RAMFUNC.
 157 bool intMfSniffSend() {
 158
 159         int pckSize = 0;
 160         int pckLen = BigBuf_get_traceLen();
 161         int pckNum = 0;
 162         uint8_t *trace = BigBuf_get_addr();
 163
 164         FpgaDisableSscDma();
 165         while (pckLen > 0) {
 166                 pckSize = MIN(USB_CMD_DATA_SIZE, pckLen);
 167                 LED_B_ON();
 168                 cmd_send(CMD_ACK, 1, BigBuf_get_traceLen(), pckSize, trace + BigBuf_get_traceLen() - pckLen, pckSize);
 169                 LED_B_OFF();
 170
 171                 pckLen -= pckSize;
 172                 pckNum++;
 173         }
 174
 175         LED_B_ON();
 176         cmd_send(CMD_ACK,2,0,0,0,0);
 177         LED_B_OFF();
 178
 179         clear_trace();
 180
 181         return TRUE;
 182 }