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"

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"

23 static int sniffState = SNF_INIT;

24 static uint8_t sniffUIDType;

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

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

27 static uint8_t sniffSAK;

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

29 static uint32_t timerData = 0;

 bool MfSniffInit(void){

         memset(sniffUID, 0x00, 8);

         memset(sniffATQA, 0x00, 2);

35 sniffSAK = 0;

36 sniffUIDType = SNF_UID_4;

38 return FALSE;

39 }

 bool MfSniffEnd(void){

42 LED_B_ON();

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

44 LED_B_OFF();

46 return FALSE;

47 }

 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

52 sniffState = SNF_INIT;

53 }

55 switch (sniffState) {

56 case SNF_INIT:{

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

58 sniffUIDType = SNF_UID_4;

                                 memset(sniffUID, 0x00, 8);

                                 memset(sniffATQA, 0x00, 2);

61 sniffSAK = 0;

62 sniffState = SNF_ATQA;

                                 if (data[0] == 0x40) 

64 sniffState = SNF_MAGIC_WUPC2;

65 }

66 break;

67 }

68 case SNF_MAGIC_WUPC2:

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

70 sniffState = SNF_CARD_IDLE;

71 }

72 break;

73 case SNF_ATQA:{

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

                                 memcpy(sniffATQA, data, 2);

76 sniffState = SNF_UID1;

77 }

78 break;

79 }

80 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);

83 sniffState = SNF_SAK;

84 }

85 break;

86 }

87 case SNF_SAK:{

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

89 sniffSAK = data[0];

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

91 sniffUIDType = SNF_UID_7;

                                         memcpy(sniffUID, sniffUID + 4, 3);

93 sniffState = SNF_UID2;

94 } else { // select completed

95 sniffState = SNF_CARD_IDLE;

96 }

97 }

98 break;

99 }

100 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);

103 sniffState = SNF_SAK;

104 }

105 break;

106 }

107 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);

112 sniffBuf[11] = sniffSAK;

                         sniffBuf[12] = 0xFF;

                         sniffBuf[13] = 0xFF;

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

116 sniffState = SNF_CARD_CMD;

117 } // intentionally no break;

118 case SNF_CARD_CMD:{

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

120 timerData = GetTickCount();

121 break;

122 }

123

124 default:

125 sniffState = SNF_INIT;

126 break;

127 }

128

129

130 return FALSE;

131 }

132

 bool RAMFUNC MfSniffSend(uint16_t maxTimeoutMs) {

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

135 return intMfSniffSend();

136 }

137 return FALSE;

138 }

139

140 // internal sending function. not a RAMFUNC.

141 bool intMfSniffSend() {

142

143 int pckSize = 0;

144 int pckLen = BigBuf_get_traceLen();

145 int pckNum = 0;

         uint8_t *trace = BigBuf_get_addr();

147

148 FpgaDisableSscDma();

         while (pckLen > 0) {

                 pckSize = MIN(USB_CMD_DATA_SIZE, pckLen);

151 LED_B_ON();

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

153 LED_B_OFF();

154

155 pckLen -= pckSize;

156 pckNum++;

157 }

158

159 LED_B_ON();

         cmd_send(CMD_ACK,2,0,0,0,0);

161 LED_B_OFF();

162

163 clear_trace();

164

165 return TRUE;

166 }