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_WUPREQ;

63 }

64 break;

65 }

66 case SNF_WUPREQ:{

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

                                 memcpy(sniffATQA, data, 2);

69 sniffState = SNF_ATQA;

70 }

71 break;

72 }

73 case SNF_ATQA:{

                         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:{

                         if ((!reader) && (len == 5) && ((data[0] ^ data[1] ^ data[2] ^ data[3]) == data[4])) {  // UID from tag (CL1) 

                                 memcpy(sniffUID + 3, data, 4);

82 sniffState = SNF_UID1;

83 }

84 break;

85 }

86 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

88 sniffState = SNF_SAK;

89 }

90 break;

91 }

92 case SNF_SAK:{

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

94 sniffSAK = data[0];

                                 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:{

                         if ((!reader) && (len == 5) && ((data[0] ^ data[1] ^ data[2] ^ data[3]) == data[4])) { // CL2 UID 

                                 memcpy(sniffUID, sniffUID+4, 3);

                                 memcpy(sniffUID+3, data, 4);

107 sniffUIDType = SNF_UID_7;

108 sniffState = SNF_UID2;

109 }

110 break;

111 }

112 case SNF_UID2:{

                         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

                         sniffBuf[0] = 0xFF;

                         sniffBuf[1] = 0xFF;

                         memcpy(sniffBuf + 2, sniffUID, 7);

                         memcpy(sniffBuf + 9, sniffATQA, 2);

123 sniffBuf[11] = sniffSAK;

                         sniffBuf[12] = 0xFF;

                         sniffBuf[13] = 0xFF;

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

127 } // intentionally no break;

128 case SNF_CARD_CMD:{

                         LogTrace(data, len, 0, 0, NULL, TRUE);

130 sniffState = SNF_CARD_RESP;

131 timerData = GetTickCount();

132 break;

133 }

134 case SNF_CARD_RESP:{

                         LogTrace(data, len, 0, 0, NULL, FALSE);

136 sniffState = SNF_CARD_CMD;

137 timerData = GetTickCount();

138 break;

139 }

140

141 default:

142 sniffState = SNF_INIT;

143 break;

144 }

145

146

147 return FALSE;

148 }

149

 bool RAMFUNC MfSniffSend(uint16_t maxTimeoutMs) {

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

152 return intMfSniffSend();

153 }

154 return FALSE;

155 }

156

157 // internal sending function. not a RAMFUNC.

158 bool intMfSniffSend() {

159

160 int pckSize = 0;

161 int pckLen = BigBuf_get_traceLen();

162 int pckNum = 0;

         uint8_t *trace = BigBuf_get_addr();

164

165 FpgaDisableSscDma();

         while (pckLen > 0) {

                 pckSize = MIN(USB_CMD_DATA_SIZE, pckLen);

168 LED_B_ON();

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

170 LED_B_OFF();

171

172 pckLen -= pckSize;

173 pckNum++;

174 }

175

176 LED_B_ON();

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

178 LED_B_OFF();

179

180 clear_trace();

181

182 return TRUE;

183 }