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                         if ((reader) && (len == 2) && (data[0] == 0x93) && (data[1] == 0x20)) { // Select ALL from reader
  75                                 sniffState = SNF_ANTICOL1;
  76                         }
  77                         break;
  78                 }
  79                 case SNF_ANTICOL1:{
  80                         if ((!reader) && (len == 5) && ((data[0] ^ data[1] ^ data[2] ^ data[3]) == data[4])) {  // UID from tag (CL1)
  81                                 memcpy(sniffUID + 3, data, 4);
  82                                 sniffState = SNF_UID1;
  83                         }
  84                         break;
  85                 }
  86                 case SNF_UID1:{
  87                         if ((reader) && (len == 9) && (data[0] == 0x93) && (data[1] == 0x70) && (CheckCrc14443(CRC_14443_A, data, 9))) {   // Select 4 Byte UID from reader
  88                                 sniffState = SNF_SAK;
  89                         }
  90                         break;
  91                 }
  92                 case SNF_SAK:{
  93                         if ((!reader) && (len == 3) && (CheckCrc14443(CRC_14443_A, data, 3))) { // SAK from card?
  94                                 sniffSAK = data[0];
  95                                 if (sniffUID[3] == 0x88) {                      // CL2 UID part to be expected
  96                                         sniffState = SNF_ANTICOL2;
  97                                 } else {                                                        // select completed
  98                                         sniffState = SNF_CARD_IDLE;
  99                                 }
 100                         }
 101                         break;
 102                 }
 103                 case SNF_ANTICOL2:{
 104                         if ((!reader) && (len == 5) && ((data[0] ^ data[1] ^ data[2] ^ data[3]) == data[4])) { // CL2 UID
 105                                 memcpy(sniffUID, sniffUID+4, 3);
 106                                 memcpy(sniffUID+3, data, 4);
 107                                 sniffUIDType = SNF_UID_7;
 108                                 sniffState = SNF_UID2;
 109                         }
 110                         break;
 111                 }
 112                 case SNF_UID2:{
 113                         if ((reader) && (len == 9) && (data[0] == 0x95) && (data[1] == 0x70) && (CheckCrc14443(CRC_14443_A, data, 9))) {        // Select 2nd part of 7 Byte UID
 114                                 sniffState = SNF_SAK;
 115                         }
 116                         break;
 117                 }
 118                 case SNF_CARD_IDLE:{    // trace the card select sequence
 119                         sniffBuf[0] = 0xFF;
 120                         sniffBuf[1] = 0xFF;
 121                         memcpy(sniffBuf + 2, sniffUID, 7);
 122                         memcpy(sniffBuf + 9, sniffATQA, 2);
 123                         sniffBuf[11] = sniffSAK;
 124                         sniffBuf[12] = 0xFF;
 125                         sniffBuf[13] = 0xFF;
 126                         LogTrace(sniffBuf, 14, 0, 0, NULL, TRUE);
 127                         sniffState = SNF_CARD_CMD;
 128                 }       // intentionally no break;
 129                 case SNF_CARD_CMD:{
 130                         LogTrace(data, len, 0, 0, NULL, reader);
 131                         timerData = GetTickCount();
 132                         break;
 133                 }
 134
 135                 default:
 136                         sniffState = SNF_INIT;
 137                 break;
 138         }
 139
 140
 141         return FALSE;
 142 }
 143
 144 bool RAMFUNC MfSniffSend(uint16_t maxTimeoutMs) {
 145         if (BigBuf_get_traceLen() && (GetTickCount() > timerData + maxTimeoutMs)) {
 146                 return intMfSniffSend();
 147         }
 148         return FALSE;
 149 }
 150
 151 // internal sending function. not a RAMFUNC.
 152 bool intMfSniffSend() {
 153
 154         int pckSize = 0;
 155         int pckLen = BigBuf_get_traceLen();
 156         int pckNum = 0;
 157         uint8_t *trace = BigBuf_get_addr();
 158
 159         FpgaDisableSscDma();
 160         while (pckLen > 0) {
 161                 pckSize = MIN(USB_CMD_DATA_SIZE, pckLen);
 162                 LED_B_ON();
 163                 cmd_send(CMD_ACK, 1, BigBuf_get_traceLen(), pckSize, trace + BigBuf_get_traceLen() - pckLen, pckSize);
 164                 LED_B_OFF();
 165
 166                 pckLen -= pckSize;
 167                 pckNum++;
 168         }
 169
 170         LED_B_ON();
 171         cmd_send(CMD_ACK,2,0,0,0,0);
 172         LED_B_OFF();
 173
 174         clear_trace();
 175
 176         return TRUE;
 177 }