git.zerfleddert.de Git - proxmark3-svn/blob

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 //-----------------------------------------------------------------------------

11 #include "mifaresniff.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 #include "usb_cdc.h"

22 #include "BigBuf.h"

23 #include "fpgaloader.h"

26 static int sniffState = SNF_INIT;

27 static uint8_t sniffUIDType;

 static uint8_t sniffUID[8] = {0x00};

 static uint8_t sniffATQA[2] = {0x00};

30 static uint8_t sniffSAK;

 static uint8_t sniffBuf[16] = {0x00};

32 static uint32_t timerData = 0;

 bool MfSniffInit(void){

         memset(sniffUID, 0x00, 8);

         memset(sniffATQA, 0x00, 2);

38 sniffSAK = 0;

39 sniffUIDType = SNF_UID_4;

41 return false;

42 }

 bool MfSniffEnd(void){

45 LED_B_ON();

         cmd_send(CMD_ACK,0,0,0,0,0);

47 LED_B_OFF();

49 return false;

50 }

 bool RAMFUNC MfSniffLogic(const uint8_t *data, uint16_t len, uint8_t *parity, uint16_t bitCnt, bool reader) {

         if (reader && (len == 1) && (bitCnt == 7)) {            // reset on 7-Bit commands from reader

55 sniffState = SNF_INIT;

56 }

58 switch (sniffState) {

59 case SNF_INIT:{

                         if ((len == 1) && (reader) && (bitCnt == 7) ) {  // REQA or WUPA from reader

61 sniffUIDType = SNF_UID_4;

                                 memset(sniffUID, 0x00, 8);

                                 memset(sniffATQA, 0x00, 2);

64 sniffSAK = 0;

65 sniffState = SNF_ATQA;

                                 if (data[0] == 0x40) 

67 sniffState = SNF_MAGIC_WUPC2;

68 }

69 break;

70 }

71 case SNF_MAGIC_WUPC2:

                         if ((len == 1) && (reader) && (data[0] == 0x43) ) {  

73 sniffState = SNF_CARD_IDLE;

74 }

75 break;

76 case SNF_ATQA:{

                         if ((!reader) && (len == 2)) {          // ATQA from tag

                                 memcpy(sniffATQA, data, 2);

79 sniffState = SNF_UID1;

80 }

81 break;

82 }

83 case SNF_UID1:{

                         if ((reader) && (len == 9) && (data[0] == 0x93) && (data[1] == 0x70) && (CheckCrc14443(CRC_14443_A, data, 9))) {   // Select 4 Byte UID from reader

                                 memcpy(sniffUID + 3, &data[2], 4);

86 sniffState = SNF_SAK;

87 }

88 break;

89 }

90 case SNF_SAK:{

                         if ((!reader) && (len == 3) && (CheckCrc14443(CRC_14443_A, data, 3))) { // SAK from card?

92 sniffSAK = data[0];

                                 if ((sniffUID[3] == 0x88) && (sniffUIDType == SNF_UID_4)) {                     // CL2 UID part to be expected

94 sniffUIDType = SNF_UID_7;

                                         memcpy(sniffUID, sniffUID + 4, 3);

96 sniffState = SNF_UID2;

97 } else { // select completed

98 sniffState = SNF_CARD_IDLE;

99 }

100 }

101 break;

102 }

103 case SNF_UID2:{

                         if ((reader) && (len == 9) && (data[0] == 0x95) && (data[1] == 0x70) && (CheckCrc14443(CRC_14443_A, data, 9))) {

                                 memcpy(sniffUID + 3, &data[2], 4);

106 sniffState = SNF_SAK;

107 }

108 break;

109 }

110 case SNF_CARD_IDLE:{ // trace the card select sequence

                         sniffBuf[0] = 0xFF;

                         sniffBuf[1] = 0xFF;

                         memcpy(sniffBuf + 2, sniffUID, 7);

                         memcpy(sniffBuf + 9, sniffATQA, 2);

115 sniffBuf[11] = sniffSAK;

                         sniffBuf[12] = 0xFF;

                         sniffBuf[13] = 0xFF;

                         LogTrace(sniffBuf, 14, 0, 0, NULL, true);

119 sniffState = SNF_CARD_CMD;

120 } // intentionally no break;

121 case SNF_CARD_CMD:{

                         LogTrace(data, len, 0, 0, parity, reader);

123 timerData = GetTickCount();

124 break;

125 }

126

127 default:

128 sniffState = SNF_INIT;

129 break;

130 }

131

132

133 return false;

134 }

135

 bool RAMFUNC MfSniffSend(uint16_t maxTimeoutMs) {

         if (BigBuf_get_traceLen() && (GetTickCount() > timerData + maxTimeoutMs)) {

138 return intMfSniffSend();

139 }

140 return false;

141 }

142

143 // internal sending function. not a RAMFUNC.

144 bool intMfSniffSend() {

145

146 int pckSize = 0;

147 int pckLen = BigBuf_get_traceLen();

148 int pckNum = 0;

         uint8_t *trace = BigBuf_get_addr();

150

151 FpgaDisableSscDma();

         while (pckLen > 0) {

                 pckSize = MIN(USB_CMD_DATA_SIZE, pckLen);

154 LED_B_ON();

                 cmd_send(CMD_DOWNLOADED_RAW_ADC_SAMPLES_125K, 1, BigBuf_get_traceLen(), pckSize, trace + BigBuf_get_traceLen() - pckLen, pckSize);

156 LED_B_OFF();

157

158 pckLen -= pckSize;

159 pckNum++;

160 }

161

162 LED_B_ON();

         cmd_send(CMD_DOWNLOADED_RAW_ADC_SAMPLES_125K,2,0,0,0,0);

164 LED_B_OFF();

165

166 clear_trace();

167

168 return true;

169 }