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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_ATQA;
63 }
64 break;
65 }
66 case SNF_ATQA:{
67 if ((!reader) && (len == 2)) { // ATQA from tag
68 memcpy(sniffATQA, data, 2);
69 sniffState = SNF_UID1;
70 }
71 break;
72 }
73 case SNF_UID1:{
74 if ((reader) && (len == 2) && (data[0] == 0x93) && (data[1] == 0x20)) { // Select ALL from reader
75 sniffState = SNF_ANTICOL1;
76 }
77
78 if ((reader) && (len == 9) && (data[0] == 0x93) && (data[1] == 0x70) && (CheckCrc14443(CRC_14443_A, data, 9))) { // Select 4 Byte UID from reader
79 memcpy(sniffUID + 3, &data[2], 4);
80 sniffState = SNF_SAK;
81 }
82 break;
83 }
84 case SNF_ANTICOL1:{
85 if ((!reader) && (len == 5) && ((data[0] ^ data[1] ^ data[2] ^ data[3]) == data[4])) { // UID from tag (CL1)
86 sniffState = SNF_UID1;
87 }
88 break;
89 }
90 case SNF_SAK:{
91 if ((!reader) && (len == 3) && (CheckCrc14443(CRC_14443_A, data, 3))) { // SAK from card?
92 sniffSAK = data[0];
93 if ((sniffUID[3] == 0x88) && (sniffUIDType == SNF_UID_4)) { // CL2 UID part to be expected
94 sniffUIDType = SNF_UID_7;
95 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_ANTICOL2:{
104 if ((!reader) && (len == 5) && ((data[0] ^ data[1] ^ data[2] ^ data[3]) == data[4])) { // CL2 UID
105 sniffState = SNF_UID2;
106 }
107 break;
108 }
109 case SNF_UID2:{
110 if ((reader) && (len == 2) && (data[0] == 0x95) && (data[1] == 0x20)) {
111 sniffState = SNF_ANTICOL2;
112 }
113
114 if ((reader) && (len == 9) && (data[0] == 0x95) && (data[1] == 0x70) && (CheckCrc14443(CRC_14443_A, data, 9))) {
115 memcpy(sniffUID + 3, &data[2], 4);
116 sniffState = SNF_SAK;
117 }
118 break;
119 }
120 case SNF_CARD_IDLE:{ // trace the card select sequence
121 sniffBuf[0] = 0xFF;
122 sniffBuf[1] = 0xFF;
123 memcpy(sniffBuf + 2, sniffUID, 7);
124 memcpy(sniffBuf + 9, sniffATQA, 2);
125 sniffBuf[11] = sniffSAK;
126 sniffBuf[12] = 0xFF;
127 sniffBuf[13] = 0xFF;
128 LogTrace(sniffBuf, 14, 0, 0, NULL, TRUE);
129 sniffState = SNF_CARD_CMD;
130 } // intentionally no break;
131 case SNF_CARD_CMD:{
132 LogTrace(data, len, 0, 0, NULL, reader);
133 timerData = GetTickCount();
134 break;
135 }
136
137 default:
138 sniffState = SNF_INIT;
139 break;
140 }
141
142
143 return FALSE;
144 }
145
146 bool RAMFUNC MfSniffSend(uint16_t maxTimeoutMs) {
147 if (BigBuf_get_traceLen() && (GetTickCount() > timerData + maxTimeoutMs)) {
148 return intMfSniffSend();
149 }
150 return FALSE;
151 }
152
153 // internal sending function. not a RAMFUNC.
154 bool intMfSniffSend() {
155
156 int pckSize = 0;
157 int pckLen = BigBuf_get_traceLen();
158 int pckNum = 0;
159 uint8_t *trace = BigBuf_get_addr();
160
161 FpgaDisableSscDma();
162 while (pckLen > 0) {
163 pckSize = MIN(USB_CMD_DATA_SIZE, pckLen);
164 LED_B_ON();
165 cmd_send(CMD_ACK, 1, BigBuf_get_traceLen(), pckSize, trace + BigBuf_get_traceLen() - pckLen, pckSize);
166 LED_B_OFF();
167
168 pckLen -= pckSize;
169 pckNum++;
170 }
171
172 LED_B_ON();
173 cmd_send(CMD_ACK,2,0,0,0,0);
174 LED_B_OFF();
175
176 clear_trace();
177
178 return TRUE;
179 }
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