mirror of
https://github.com/RfidResearchGroup/proxmark3.git
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425 lines
18 KiB
C
425 lines
18 KiB
C
//-----------------------------------------------------------------------------
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// Copyright (C) Salvador Mendoza (salmg.net) - January 01, 2021
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// Copyright (C) Proxmark3 contributors. See AUTHORS.md for details.
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// See LICENSE.txt for the text of the license.
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//-----------------------------------------------------------------------------
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// Code to relay 14a technology data aka reblay by Salvador Mendoza
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//-----------------------------------------------------------------------------
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#include "standalone.h"
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#include "proxmark3_arm.h"
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#include "appmain.h"
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#include "fpgaloader.h"
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#include "util.h"
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#include "dbprint.h"
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#include "ticks.h"
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#include "string.h"
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#include "BigBuf.h"
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#include "iso14443a.h"
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#include "protocols.h"
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#include "cmd.h"
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#include "usart.h" // Bluetooth reading & writing
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void ModInfo(void) {
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DbpString(" HF - Relaying ISO/14443A data over Bluetooth - (Salvador Mendoza)");
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}
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/* This standalone implements two different modes: reading & emulating, to switch between them
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* just press the button.
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*
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* Reading ISO-14443A technology is not limited to payment cards. This example
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* was designed to open new possibilities relaying ISO-14443A data over Bluetooth.
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*
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* Instructions:
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*
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* I recommend setting up & run the other end before start sending or receiving data in this Proxmark3
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* standalone.
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*
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* For the reading mode:
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* - Set up and run the other end first, to where the Proxmark will send the data.
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* - After the card is detected, Proxmark3 will send a package. The first byte will be the package
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* length, then, the card data. Use the first length byte to read the whole package.
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* - Proxmark3 will expect a raw APDU from the other end, then it will be sent to the card.
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* - The answer of the card will be sent back to the connection, repeating the cycle.
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*
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* For the emulation mode:
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* - Set up and run the other end first, from where the Proxmark will receive the data.
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* - When the Proxmark3 detected the terminal, it will send the command to the connection.
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* - The first byte will be the package length, then, the terminal command. Use the first
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* length byte to read the whole package.
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* - Proxmark3 will expect a raw APDU from the other end, then it will be sent to the terminal.
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* - The command of the terminal will be sent back to the connection, repeating the cycle.
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*
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* Notes:
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* - The emulation mode was tested in a real SumUp payment terminal. This does not mean
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* that it will work in all the terminals around the world.
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* - The emulation mode implements different techniques to try to keep the connection alive:
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* WTX or ACK for NACK requests. Some of these requests could be denied depending on
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* the reader configuration.
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*
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*
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* Be brave enough to share your knowledge & inspire others.
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*/
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void RunMod() {
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StandAloneMode();
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Dbprintf(_YELLOW_(">>") "Relaying ISO/14443A data over Bluetooth a.k.a. reblay Started<<");
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FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
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// Allocate 512 bytes for the dynamic modulation, created when the reader queries for it
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// Such a response is less time critical, so we can prepare them on the fly
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#define DYNAMIC_RESPONSE_BUFFER_SIZE 512
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#define DYNAMIC_MODULATION_BUFFER_SIZE 1024
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uint8_t flags = FLAG_4B_UID_IN_DATA; //UID 4 bytes(could be 7 bytes if needed it)
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uint8_t data[PM3_CMD_DATA_SIZE] = {0x00}; // in case there is a read command received we shouldn't break
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uint8_t visauid[7] = {0x01, 0x02, 0x03, 0x04};
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memcpy(data, visauid, 4);
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// to initialize the emulation
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uint8_t tagType = 4; // 4 = ISO/IEC 14443-4 - javacard (JCOP)
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tag_response_info_t *responses;
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uint32_t cuid = 0;
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uint32_t counters[3] = { 0x00, 0x00, 0x00 };
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uint8_t tearings[3] = { 0xbd, 0xbd, 0xbd };
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uint8_t pages = 0;
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// For received Bluetooth package
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uint8_t rpacket[MAX_FRAME_SIZE] = { 0x00 };
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uint16_t lenpacket;
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// For answering the commands
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uint8_t apdubuffer[MAX_FRAME_SIZE] = { 0x00 };
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uint8_t apdulen = 0;
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// Buffer for Bluetooth data
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uint8_t buffert[MAX_FRAME_SIZE] = { 0x00 };
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uint8_t bufferlen = 0;
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// Reading card
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iso14a_card_select_t card_a_info;
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// For init ping process
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uint8_t sak = {0x0};
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uint8_t atqa[2] = { 0x00, 0x00 };
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uint8_t uidc[10] = { 0x00 };
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uint8_t uidlen = 0;
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uint8_t ats[MAX_FRAME_SIZE] = { 0x00 };
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uint8_t atsl = 0;
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uint8_t rdata[14] = { 0x00 };
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// Command buffers
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uint8_t receivedCmd[MAX_FRAME_SIZE] = { 0x00 };
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uint8_t receivedCmdPar[MAX_PARITY_SIZE] = { 0x00 };
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uint8_t dynamic_response_buffer[DYNAMIC_RESPONSE_BUFFER_SIZE] = {0};
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uint8_t dynamic_modulation_buffer[DYNAMIC_MODULATION_BUFFER_SIZE] = {0};
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// Command response - handler
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tag_response_info_t dynamic_response_info = {
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.response = dynamic_response_buffer,
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.response_n = 0,
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.modulation = dynamic_modulation_buffer,
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.modulation_n = 0
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};
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#define STATE_READ 0
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#define STATE_EMU 1
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uint8_t state = STATE_READ;
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if (state == STATE_READ) {
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DbpString(_YELLOW_("[ ") "In reading mode" _YELLOW_(" ]"));
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} else {
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DbpString(_YELLOW_("[ ") "In emulation mode" _YELLOW_(" ]"));
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}
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for (;;) {
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WDT_HIT();
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// Exit from RunMod, send a usbcommand.
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if (data_available()) break;
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// Button held down or pressed?
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int button_pressed = BUTTON_HELD(1000);
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if (button_pressed == BUTTON_HOLD) // Holding down the button
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break;
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else if (button_pressed == BUTTON_SINGLE_CLICK) { // Pressing one time change between reading & emulation
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if (state == STATE_READ) {
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state = STATE_EMU;
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DbpString(_YELLOW_("[ ") "In emulation mode" _YELLOW_(" ]"));
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} else {
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state = STATE_READ;
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DbpString(_YELLOW_("[ ") "In reading mode" _YELLOW_(" ]"));
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}
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}
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SpinDelay(500);
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if (state == STATE_READ) {
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LED_A_ON();
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clear_trace();
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set_tracing(true);
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iso14443a_setup(FPGA_HF_ISO14443A_READER_MOD);
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if (iso14443a_select_card(NULL, &card_a_info, NULL, true, 0, false)) {
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LED_B_ON();
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// Get data to send a ping with UID + ATQA + SAK
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sak = card_a_info.sak;
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uidlen = card_a_info.uidlen;
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atsl = card_a_info.ats_len;
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memcpy(uidc, card_a_info.uid, uidlen);
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memcpy(atqa, card_a_info.atqa, 2);
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memcpy(ats, card_a_info.ats, atsl);
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DbpString(_YELLOW_("[ ") "UID:" _YELLOW_(" ]"));
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Dbhexdump(uidlen, uidc, false);
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DbpString(_YELLOW_("[ ") "ATQA:" _YELLOW_(" ]"));
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Dbhexdump(2, atqa, false);
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Dbprintf(_YELLOW_("[ ") "SAK: %x "_YELLOW_(" ]"), sak);
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DbpString(_YELLOW_("[ ") "ATS:" _YELLOW_(" ]"));
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Dbhexdump(atsl, ats, false);
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memcpy(&rdata[1], uidc, uidlen);
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memcpy(&rdata[uidlen + 1], atqa, 2);
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memcpy(&rdata[uidlen + 3], &sak, 1);
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rdata[0] = uidlen + 3;
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// ping = UID + ATQA + SAK
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DbpString(_YELLOW_("[ ") "Ping:" _YELLOW_(" ]"));
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Dbhexdump(uidlen + 4, rdata, false);
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DbpString(_YELLOW_("[ ") "Sending ping" _YELLOW_(" ]"));
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if (usart_writebuffer_sync(rdata, uidlen + 4) == PM3_SUCCESS) {
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DbpString(_YELLOW_("[ ") "Sent!" _YELLOW_(" ]"));
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for (;;) {
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if (usart_rxdata_available()) {
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lenpacket = usart_read_ng(rpacket, sizeof(rpacket));
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if (lenpacket > 1) {
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DbpString(_YELLOW_("[ ") "Bluetooth data:" _YELLOW_(" ]"));
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Dbhexdump(lenpacket, rpacket, false);
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apdulen = iso14_apdu(rpacket, (uint16_t) lenpacket, false, apdubuffer, NULL);
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DbpString(_YELLOW_("[ ") "Card response:" _YELLOW_(" ]"));
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Dbhexdump(apdulen - 2, apdubuffer, false);
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bufferlen = apdulen - 2;
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memcpy(&buffert[0], &bufferlen, 1);
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memcpy(&buffert[1], apdubuffer, bufferlen);
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DbpString(_YELLOW_("[ ") "Buffer:" _YELLOW_(" ]"));
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Dbhexdump(bufferlen, buffert, false);
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usart_writebuffer_sync(buffert, bufferlen + 1);
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} else if (lenpacket == 1) {
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DbpString(_YELLOW_("[ ") "Done!" _YELLOW_(" ]"));
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LED_C_ON();
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for (uint8_t i = 0; i < 3; i++)
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SpinDelay(1000);
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break;
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}
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}
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LED_B_OFF();
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}
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} else {
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DbpString(_YELLOW_("[ ") "Cannot send it!" _YELLOW_(" ]"));
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SpinDelay(1000);
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}
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}
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FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
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LED_D_OFF();
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} else if (state == STATE_EMU) {
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LED_A_OFF();
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LED_C_ON();
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// free eventually allocated BigBuf memory but keep Emulator Memory
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BigBuf_free_keep_EM();
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if (SimulateIso14443aInit(tagType, flags, data, &responses, &cuid, counters, tearings, &pages) == false) {
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BigBuf_free_keep_EM();
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reply_ng(CMD_HF_MIFARE_SIMULATE, PM3_EINIT, NULL, 0);
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DbpString(_YELLOW_("!!") "Error initializing the emulation process!");
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SpinDelay(500);
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state = STATE_READ;
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DbpString(_YELLOW_("[ ") "Initialized reading mode" _YELLOW_(" ]"));
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continue;
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}
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// We need to listen to the high-frequency, peak-detected path.
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iso14443a_setup(FPGA_HF_ISO14443A_TAGSIM_LISTEN);
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int len = 0; // Command length
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int retval = PM3_SUCCESS; // Check emulation status
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uint8_t resp = 0; // Bluetooth response
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lenpacket = 0;
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uint8_t prevcmd = 0x00; // Keep track of last terminal type command
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clear_trace();
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set_tracing(true);
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for (;;) {
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LED_B_OFF();
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// Clean receive command buffer
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if (!GetIso14443aCommandFromReader(receivedCmd, receivedCmdPar, &len)) {
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DbpString(_YELLOW_("!!") "Emulator stopped");
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retval = PM3_EOPABORTED;
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break;
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}
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tag_response_info_t *p_response = NULL;
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LED_B_ON();
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// dynamic_response_info will be in charge of responses
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dynamic_response_info.response_n = 0;
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if (lenpacket == 0 && resp == 2) { // Check for Bluetooth packages
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if (usart_rxdata_available()) {
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lenpacket = usart_read_ng(rpacket, sizeof(rpacket));
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if (lenpacket > 0) {
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DbpString(_YELLOW_("[ ") "Received Bluetooth data" _YELLOW_(" ]"));
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Dbhexdump(lenpacket, rpacket, false);
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memcpy(&dynamic_response_info.response[1], rpacket, lenpacket);
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dynamic_response_info.response[0] = prevcmd;
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dynamic_response_info.response_n = lenpacket + 1;
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resp = 1;
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}
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}
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}
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if (receivedCmd[0] == ISO14443A_CMD_REQA && len == 1) { // Received a REQUEST
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DbpString(_YELLOW_("+") "REQUEST Received");
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p_response = &responses[RESP_INDEX_ATQA];
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} else if (receivedCmd[0] == ISO14443A_CMD_HALT && len == 4) { // Received a HALT
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DbpString(_YELLOW_("+") "Received a HALT");
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p_response = NULL;
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resp = 0;
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} else if (receivedCmd[0] == ISO14443A_CMD_WUPA && len == 1) { // Received a WAKEUP
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DbpString(_YELLOW_("+") "WAKEUP Received");
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p_response = &responses[RESP_INDEX_ATQA];
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resp = 0;
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} else if (receivedCmd[1] == 0x20 && receivedCmd[0] == ISO14443A_CMD_ANTICOLL_OR_SELECT && len == 2) { // Received request for UID (cascade 1)
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DbpString(_YELLOW_("+") "Request for UID C1");
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p_response = &responses[RESP_INDEX_UIDC1];
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} else if (receivedCmd[1] == 0x70 && receivedCmd[0] == ISO14443A_CMD_ANTICOLL_OR_SELECT && len == 9) { // Received a SELECT (cascade 1)
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DbpString(_YELLOW_("+") "Request for SELECT S1");
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p_response = &responses[RESP_INDEX_SAKC1];
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} else if (receivedCmd[0] == ISO14443A_CMD_RATS && len == 4) { // Received a RATS request
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DbpString(_YELLOW_("+") "Request for RATS");
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p_response = &responses[RESP_INDEX_RATS];
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resp = 1;
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} else if (receivedCmd[0] == 0xf2 && len == 4) { // ACKed - Time extension
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DbpString(_YELLOW_("!!") "Reader accepted time extension!");
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p_response = NULL;
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} else if ((receivedCmd[0] == 0xb2 || receivedCmd[0] == 0xb3) && len == 3) { //NACK - Request more time WTX
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DbpString(_YELLOW_("!!") "NACK - time extension request?");
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if (resp == 2 && lenpacket == 0) {
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DbpString(_YELLOW_("!!") "Requesting more time - WTX");
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dynamic_response_info.response_n = 2;
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dynamic_response_info.response[0] = 0xf2;
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dynamic_response_info.response[1] = 0x0b; // Requesting the maximum amount of time
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} else if (lenpacket == 0) {
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DbpString(_YELLOW_("!!") "NACK - ACK - Resend last command!"); // To burn some time as well
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dynamic_response_info.response[0] = 0xa3;
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dynamic_response_info.response_n = 1;
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} else {
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DbpString(_YELLOW_("!!") "Avoiding request - Bluetooth data already in memory!!");
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}
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} else {
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DbpString(_GREEN_("[ ") "Card reader command" _GREEN_(" ]"));
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Dbhexdump(len - 2, &receivedCmd[1], false);
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if ((receivedCmd[0] == 0x02 || receivedCmd[0] == 0x03) && len > 3) { // Process reader commands
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if (resp == 1) {
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prevcmd = receivedCmd[0];
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bufferlen = len - 3;
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memcpy(&buffert[0], &bufferlen, 1);
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memcpy(&buffert[1], &receivedCmd[1], bufferlen);
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resp = 2;
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}
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if (lenpacket > 0) {
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DbpString(_YELLOW_("[ ") "Answering using Bluetooth data!" _YELLOW_(" ]"));
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memcpy(&dynamic_response_info.response[1], rpacket, lenpacket);
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dynamic_response_info.response[0] = receivedCmd[0];
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dynamic_response_info.response_n = lenpacket + 1;
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lenpacket = 0;
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resp = 1;
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} else {
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DbpString(_YELLOW_("[ ") "New command: sent it & waiting for Bluetooth response!" _YELLOW_(" ]"));
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usart_writebuffer_sync(buffert, bufferlen + 1);
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p_response = NULL;
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}
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} else {
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if (lenpacket == 0) {
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DbpString(_YELLOW_("!!") "Received unknown command!");
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memcpy(dynamic_response_info.response, receivedCmd, len);
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dynamic_response_info.response_n = len;
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} else {
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DbpString(_YELLOW_("!!") "Avoiding unknown command - Bluetooth data already in memory!!");
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}
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}
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}
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if (dynamic_response_info.response_n > 0) {
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DbpString(_GREEN_("[ ") "Proxmark3 answer" _GREEN_(" ]"));
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Dbhexdump(dynamic_response_info.response_n, dynamic_response_info.response, false);
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DbpString("----");
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if (lenpacket > 0) {
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lenpacket = 0;
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resp = 1;
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}
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// Add CRC bytes, always used in ISO 14443A-4 compliant cards
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AddCrc14A(dynamic_response_info.response, dynamic_response_info.response_n);
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dynamic_response_info.response_n += 2;
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if (prepare_tag_modulation(&dynamic_response_info, DYNAMIC_MODULATION_BUFFER_SIZE) == false) {
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Dbprintf(_YELLOW_("[ ") "Buffer size: %d "_YELLOW_(" ]"), dynamic_response_info.response_n);
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SpinDelay(500);
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DbpString(_YELLOW_("!!") "Error preparing Proxmark to answer!");
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continue;
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}
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p_response = &dynamic_response_info;
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}
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if (p_response != NULL) {
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EmSendPrecompiledCmd(p_response);
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}
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}
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switch_off();
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set_tracing(false);
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BigBuf_free_keep_EM();
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reply_ng(CMD_HF_MIFARE_SIMULATE, retval, NULL, 0);
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}
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}
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DbpString(_YELLOW_("[=]") "exiting");
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LEDsoff();
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}
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