+//-----------------------------------------------------------------------------
+// Merlok - 2012
+//
+// This code is licensed to you under the terms of the GNU GPL, version 2 or,
+// at your option, any later version. See the LICENSE.txt file for the text of
+// the license.
+//-----------------------------------------------------------------------------
+// Routines to support mifare classic sniffer.
+//-----------------------------------------------------------------------------
+
+#include "mifaresniff.h"
+#include "apps.h"
+#include "proxmark3.h"
+#include "util.h"
+#include "string.h"
+#include "iso14443crc.h"
+#include "iso14443a.h"
+#include "crapto1/crapto1.h"
+#include "mifareutil.h"
+#include "common.h"
+
+
+static int sniffState = SNF_INIT;
+static uint8_t sniffUIDType;
+static uint8_t sniffUID[8] = {0x00};
+static uint8_t sniffATQA[2] = {0x00};
+static uint8_t sniffSAK;
+static uint8_t sniffBuf[16] = {0x00};
+static uint32_t timerData = 0;
+
+
+bool MfSniffInit(void){
+ memset(sniffUID, 0x00, 8);
+ memset(sniffATQA, 0x00, 2);
+ sniffSAK = 0;
+ sniffUIDType = SNF_UID_4;
+
+ return FALSE;
+}
+
+bool MfSniffEnd(void){
+ LED_B_ON();
+ cmd_send(CMD_ACK,0,0,0,0,0);
+ LED_B_OFF();
+
+ return FALSE;
+}
+
+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
+ sniffState = SNF_INIT;
+ }
+
+ switch (sniffState) {
+ case SNF_INIT:{
+ if ((len == 1) && (reader) && (bitCnt == 7) ) { // REQA or WUPA from reader
+ sniffUIDType = SNF_UID_4;
+ memset(sniffUID, 0x00, 8);
+ memset(sniffATQA, 0x00, 2);
+ sniffSAK = 0;
+ sniffState = SNF_WUPREQ;
+ }
+ break;
+ }
+ case SNF_WUPREQ:{
+ if ((!reader) && (len == 2)) { // ATQA from tag
+ memcpy(sniffATQA, data, 2);
+ sniffState = SNF_ATQA;
+ }
+ break;
+ }
+ case SNF_ATQA:
+ case SNF_UID1:{\r
+ // SNF_ATQA\r
+ if ((reader) && (len == 2) && (data[0] == 0x93) && (data[1] == 0x20)) { // Select ALL from reader
+ sniffState = SNF_ANTICOL1;
+ }\r
+ \r
+ // SNF_UID1
+ if ((reader) && (len == 9) && (data[0] == 0x93) && (data[1] == 0x70) && (CheckCrc14443(CRC_14443_A, data, 9))) { // Select 4 Byte UID from reader\r
+ memcpy(sniffUID + 3, &data[2], 4);\r
+ sniffState = SNF_SAK;\r
+ }\r
+ break;
+ }\r
+ 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);
+ sniffState = SNF_UID1;
+ }
+ break;
+ }
+ case SNF_SAK:{
+ if ((!reader) && (len == 3) && (CheckCrc14443(CRC_14443_A, data, 3))) { // SAK from card?
+ sniffSAK = data[0];
+ if ((sniffUID[3] == 0x88) && (sniffUIDType == SNF_UID_4)) { // CL2 UID part to be expected
+ sniffUIDType = SNF_UID_7;\r
+ memcpy(sniffUID, sniffUID + 4, 3);\r
+ sniffState = SNF_UID2;
+ } else { // select completed
+ sniffState = SNF_CARD_IDLE;
+ }
+ }
+ break;
+ }
+ case SNF_ANTICOL2:{
+ if ((!reader) && (len == 5) && ((data[0] ^ data[1] ^ data[2] ^ data[3]) == data[4])) { // CL2 UID
+ memcpy(sniffUID + 3, data, 4);\r
+ sniffState = SNF_UID2;
+ }
+ break;
+ }
+ case SNF_UID2:{\r
+ if ((reader) && (len == 2) && (data[0] == 0x95) && (data[1] == 0x20)) {\r
+ sniffState = SNF_ANTICOL2;\r
+ }\r
+ \r
+ if ((reader) && (len == 9) && (data[0] == 0x95) && (data[1] == 0x70) && (CheckCrc14443(CRC_14443_A, data, 9))) {\r
+ memcpy(sniffUID + 3, &data[2], 4);\r
+ sniffState = SNF_SAK;\r
+ }\r
+ break;\r
+ }\r
+ 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);
+ sniffBuf[11] = sniffSAK;
+ sniffBuf[12] = 0xFF;
+ sniffBuf[13] = 0xFF;
+ LogTrace(sniffBuf, 14, 0, 0, NULL, TRUE);
+ sniffState = SNF_CARD_CMD;
+ } // intentionally no break;
+ case SNF_CARD_CMD:{
+ LogTrace(data, len, 0, 0, NULL, reader);
+ timerData = GetTickCount();
+ break;
+ }
+
+ default:
+ sniffState = SNF_INIT;
+ break;
+ }
+
+
+ return FALSE;
+}
+
+bool RAMFUNC MfSniffSend(uint16_t maxTimeoutMs) {
+ if (BigBuf_get_traceLen() && (GetTickCount() > timerData + maxTimeoutMs)) {
+ return intMfSniffSend();
+ }
+ return FALSE;
+}
+
+// internal sending function. not a RAMFUNC.
+bool intMfSniffSend() {
+
+ int pckSize = 0;
+ int pckLen = BigBuf_get_traceLen();
+ int pckNum = 0;
+ uint8_t *trace = BigBuf_get_addr();
+
+ FpgaDisableSscDma();
+ while (pckLen > 0) {
+ pckSize = MIN(USB_CMD_DATA_SIZE, pckLen);
+ LED_B_ON();
+ cmd_send(CMD_ACK, 1, BigBuf_get_traceLen(), pckSize, trace + BigBuf_get_traceLen() - pckLen, pckSize);
+ LED_B_OFF();
+
+ pckLen -= pckSize;
+ pckNum++;
+ }
+
+ LED_B_ON();
+ cmd_send(CMD_ACK,2,0,0,0,0);
+ LED_B_OFF();
+
+ clear_trace();
+
+ return TRUE;
+}
projects / proxmark3-svn / blobdiff