mirror of
https://github.com/RfidResearchGroup/proxmark3.git
synced 2024-11-14 21:58:44 +08:00
303 lines
11 KiB
C
303 lines
11 KiB
C
//-----------------------------------------------------------------------------
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// This code is licensed to you under the terms of the GNU GPL, version 2 or,
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// at your option, any later version. See the LICENSE.txt file for the text of
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// the license.
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//-----------------------------------------------------------------------------
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// main code for standalone HF Sniff (and ULC/NTAG/ULEV1 pwd storing)
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//-----------------------------------------------------------------------------
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/*
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This can actually be used in two separate ways.
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It can either be used to just HF 14a sniff on the go and/or grab the
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authentication attempts for ULC/NTAG/ULEV1 into the flash mem (RDV4).
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The retrieved sniffing session can be acquired by connecting the device
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to a client that supports the reconnect capability and issue 'hf 14a list'.
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In order to view the grabbed authentication attempts in the flash mem,
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you can simply run 'script run read_pwd_mem' or just 'mem read l 256'
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from the client to view the stored quadlets.
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*/
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#include "hf_bog.h"
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#define DELAY_READER_AIR2ARM_AS_SNIFFER (2 + 3 + 8)
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#define DELAY_TAG_AIR2ARM_AS_SNIFFER (3 + 14 + 8)
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// Maximum number of auth attempts per standalone session
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#define MAX_PWDS_PER_SESSION 64
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uint8_t FindOffsetInFlash() {
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uint8_t mem[4] = { 0x00, 0x00, 0x00, 0x00 };
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uint8_t eom[4] = { 0xFF, 0xFF, 0xFF, 0xFF };
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uint8_t memcnt = 0;
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while (memcnt < 0xFF) {
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Flash_ReadData(memcnt, mem, 4);
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if (memcmp(mem, eom, 4) == 0) {
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return memcnt;
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}
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memcnt += 4;
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}
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return 0; // wrap-around
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}
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void EraseMemory() {
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if (!FlashInit()) {
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return;
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}
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Flash_CheckBusy(BUSY_TIMEOUT);
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Flash_WriteEnable();
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Flash_Erase4k(0, 0);
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if (MF_DBGLEVEL > 1) Dbprintf("[!] Erased flash!");
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FlashStop();
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SpinDelay(100);
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}
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// This is actually copied from SniffIso14443a
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void RAMFUNC SniffAndStore(uint8_t param) {
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iso14443a_setup(FPGA_HF_ISO14443A_SNIFFER);
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// Allocate memory from BigBuf for some buffers
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// free all previous allocations first
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BigBuf_free();
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BigBuf_Clear_ext(false);
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clear_trace();
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set_tracing(true);
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// Array to store the authpwds
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uint8_t *capturedPwds = BigBuf_malloc(4 * MAX_PWDS_PER_SESSION);
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// The command (reader -> tag) that we're receiving.
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uint8_t *receivedCmd = BigBuf_malloc(MAX_FRAME_SIZE);
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uint8_t *receivedCmdPar = BigBuf_malloc(MAX_PARITY_SIZE);
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// The response (tag -> reader) that we're receiving.
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uint8_t *receivedResp = BigBuf_malloc(MAX_FRAME_SIZE);
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uint8_t *receivedRespPar = BigBuf_malloc(MAX_PARITY_SIZE);
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// The DMA buffer, used to stream samples from the FPGA
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uint8_t *dmaBuf = BigBuf_malloc(DMA_BUFFER_SIZE);
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uint8_t *data = dmaBuf;
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uint8_t previous_data = 0;
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int dataLen;
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bool TagIsActive = false;
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bool ReaderIsActive = false;
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// Set up the demodulator for tag -> reader responses.
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DemodInit(receivedResp, receivedRespPar);
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// Set up the demodulator for the reader -> tag commands
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UartInit(receivedCmd, receivedCmdPar);
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// Setup and start DMA.
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if (!FpgaSetupSscDma((uint8_t *) dmaBuf, DMA_BUFFER_SIZE)) {
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if (MF_DBGLEVEL > 1) Dbprintf("FpgaSetupSscDma failed. Exiting");
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return;
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}
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tUart *uart = GetUart();
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tDemod *demod = GetDemod();
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// We won't start recording the frames that we acquire until we trigger;
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// a good trigger condition to get started is probably when we see a
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// response from the tag.
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// triggered == false -- to wait first for card
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bool triggered = !(param & 0x03);
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uint32_t my_rsamples = 0;
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// Current captured passwords counter
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uint8_t auth_attempts = 0;
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SpinDelay(50);
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// loop and listen
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while (!BUTTON_PRESS()) {
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WDT_HIT();
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LED_A_ON();
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int register readBufDataP = data - dmaBuf;
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int register dmaBufDataP = DMA_BUFFER_SIZE - AT91C_BASE_PDC_SSC->PDC_RCR;
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if (readBufDataP <= dmaBufDataP)
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dataLen = dmaBufDataP - readBufDataP;
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else
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dataLen = DMA_BUFFER_SIZE - readBufDataP + dmaBufDataP;
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// test for length of buffer
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if (dataLen > DMA_BUFFER_SIZE) { // TODO: Check if this works properly
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Dbprintf("[!] blew circular buffer! | datalen %u", dataLen);
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break;
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}
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if (dataLen < 1) continue;
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// primary buffer was stopped( <-- we lost data!
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if (!AT91C_BASE_PDC_SSC->PDC_RCR) {
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AT91C_BASE_PDC_SSC->PDC_RPR = (uint32_t) dmaBuf;
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AT91C_BASE_PDC_SSC->PDC_RCR = DMA_BUFFER_SIZE;
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//Dbprintf("[-] RxEmpty ERROR | data length %d", dataLen); // temporary
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}
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// secondary buffer sets as primary, secondary buffer was stopped
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if (!AT91C_BASE_PDC_SSC->PDC_RNCR) {
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AT91C_BASE_PDC_SSC->PDC_RNPR = (uint32_t) dmaBuf;
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AT91C_BASE_PDC_SSC->PDC_RNCR = DMA_BUFFER_SIZE;
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}
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LED_A_OFF();
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// Need two samples to feed Miller and Manchester-Decoder
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if (my_rsamples & 0x01) {
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if (!TagIsActive) { // no need to try decoding reader data if the tag is sending
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uint8_t readerdata = (previous_data & 0xF0) | (*data >> 4);
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if (MillerDecoding(readerdata, (my_rsamples - 1) * 4)) {
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LED_C_ON();
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// check - if there is a short 7bit request from reader
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if ((!triggered) && (param & 0x02) && (uart->len == 1) && (uart->bitCount == 7)) triggered = true;
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if (triggered) {
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if ((receivedCmd) && ((receivedCmd[0] == MIFARE_ULEV1_AUTH) || (receivedCmd[0] == MIFARE_ULC_AUTH_1))) {
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if (MF_DBGLEVEL > 1) Dbprintf("PWD-AUTH KEY: 0x%02x%02x%02x%02x", receivedCmd[1], receivedCmd[2], receivedCmd[3], receivedCmd[4]);
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// temporarily save the captured pwd in our array
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memcpy(&capturedPwds[4 * auth_attempts], receivedCmd + 1, 4);
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auth_attempts++;
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}
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if (!LogTrace(receivedCmd,
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uart->len,
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uart->startTime * 16 - DELAY_READER_AIR2ARM_AS_SNIFFER,
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uart->endTime * 16 - DELAY_READER_AIR2ARM_AS_SNIFFER,
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uart->parity,
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true)) break;
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}
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/* ready to receive another command. */
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UartReset();
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/* reset the demod code, which might have been */
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/* false-triggered by the commands from the reader. */
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DemodReset();
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LED_B_OFF();
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}
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ReaderIsActive = (uart->state != STATE_UNSYNCD);
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}
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// no need to try decoding tag data if the reader is sending - and we cannot afford the time
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if (!ReaderIsActive) {
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uint8_t tagdata = (previous_data << 4) | (*data & 0x0F);
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if (ManchesterDecoding(tagdata, 0, (my_rsamples - 1) * 4)) {
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LED_B_ON();
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if (!LogTrace(receivedResp,
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demod->len,
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demod->startTime * 16 - DELAY_TAG_AIR2ARM_AS_SNIFFER,
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demod->endTime * 16 - DELAY_TAG_AIR2ARM_AS_SNIFFER,
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demod->parity,
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false)) break;
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if ((!triggered) && (param & 0x01)) triggered = true;
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// ready to receive another response.
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DemodReset();
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// reset the Miller decoder including its (now outdated) input buffer
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UartReset();
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//UartInit(receivedCmd, receivedCmdPar);
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LED_C_OFF();
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}
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TagIsActive = (demod->state != DEMOD_UNSYNCD);
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}
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}
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previous_data = *data;
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my_rsamples++;
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data++;
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if (data == dmaBuf + DMA_BUFFER_SIZE) {
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data = dmaBuf;
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}
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} // end main loop
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FpgaDisableSscDma();
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set_tracing(false);
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Dbprintf("Stopped sniffing");
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SpinDelay(200);
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// Write stuff to flash
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if (auth_attempts > 0) {
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if (MF_DBGLEVEL > 1) Dbprintf("[!] Authentication attempts = %u", auth_attempts);
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// Setting the SPI Baudrate to 48MHz to avoid the bit-flip issue (https://github.com/RfidResearchGroup/proxmark3/issues/34)
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FlashmemSetSpiBaudrate(48000000);
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// Find the offset in flash mem to continue writing the auth attempts
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uint8_t memoffset = FindOffsetInFlash();
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if (MF_DBGLEVEL > 1) Dbprintf("[!] Memory offset = %u", memoffset);
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if ((memoffset + 4 * auth_attempts) > 0xFF) {
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// We opt to keep the new data only
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memoffset = 0;
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if (MF_DBGLEVEL > 1) Dbprintf("[!] Size of total data > 256 bytes. Discarding the old data.");
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}
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// Get previous data from flash mem
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uint8_t *previousdata = BigBuf_malloc(memoffset);
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if (memoffset > 0) {
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uint16_t readlen = Flash_ReadData(0, previousdata, memoffset);
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if (MF_DBGLEVEL > 1) Dbprintf("[!] Read %u bytes from flash mem", readlen);
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}
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// create new bigbuf to hold all data
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size_t total_size = memoffset + 4 * auth_attempts;
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uint8_t *total_data = BigBuf_malloc(total_size);
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// Add the previousdata array into total_data array
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memcpy(total_data, previousdata, memoffset);
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// Copy bytes of capturedPwds immediately following bytes of previousdata
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memcpy(total_data + memoffset, capturedPwds, 4 * auth_attempts);
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// Erase first page of flash mem
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EraseMemory();
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// Write total data to flash mem
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uint16_t writelen = Flash_WriteData(0, total_data, memoffset + 4 * auth_attempts);
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if (MF_DBGLEVEL > 1) Dbprintf("[!] Wrote %u bytes into flash mem", writelen);
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// If pwd saved successfully, blink led A three times
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if (writelen > 0) {
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SpinErr(0, 200, 5); // blink led A
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}
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SpinDelay(100);
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// Reset the SPI Baudrate to the default value (24MHz)
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FlashmemSetSpiBaudrate(24000000);
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}
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}
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void ModInfo(void) {
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DbpString(" HF 14a sniff standalone with ULC/ULEV1/NTAG auth storing in flashmem - aka BogitoRun (Bogito)");
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}
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void RunMod() {
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StandAloneMode();
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Dbprintf(">> Bogiton 14a Sniff UL/UL-EV1/NTAG a.k.a BogitoRun Started <<");
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Dbprintf("Starting to sniff");
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// param:
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// bit 0 - trigger from first card answer
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// bit 1 - trigger from first reader 7-bit request
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SniffAndStore(0);
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LEDsoff();
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SpinDelay(300);
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Dbprintf("- [ End ] -> You can take shell back ...");
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Dbprintf("- [ ! ] -> use 'script run read_pwd_mem' to print passwords");
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}
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