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proxmark3/armsrc/mifaresim.c
Philippe Teuwen 482db05741 Rename few stuff for consistency
2019-04-18 12:49:51 +02:00

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//-----------------------------------------------------------------------------
// Merlok - June 2011, 2012
// Gerhard de Koning Gans - May 2008
// Hagen Fritsch - June 2010
//
// 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.
//-----------------------------------------------------------------------------
// Mifare Classic Card Simulation
//-----------------------------------------------------------------------------
// Verbose Mode:
// MF_DBG_NONE 0
// MF_DBG_ERROR 1
// MF_DBG_INFO 2
// MF_DBG_DEBUG 3
// MF_DBG_EXTENDED 4
// /!\ Printing Debug message is disrupting emulation,
// Only use with caution during debugging
#include "iso14443a.h"
#include "mifaresim.h"
#include "crapto1/crapto1.h"
#include "BigBuf.h"
#include "string.h"
#include "mifareutil.h"
#include "fpgaloader.h"
#include "proxmark3.h"
#include "usb_cdc.h"
#include "cmd.h"
#include "protocols.h"
#include "apps.h"
static bool IsTrailerAccessAllowed(uint8_t blockNo, uint8_t keytype, uint8_t action) {
uint8_t sector_trailer[16];
emlGetMem(sector_trailer, blockNo, 1);
uint8_t AC = ((sector_trailer[7] >> 5) & 0x04)
| ((sector_trailer[8] >> 2) & 0x02)
| ((sector_trailer[8] >> 7) & 0x01);
switch (action) {
case AC_KEYA_READ: {
if (MF_DBGLEVEL >= MF_DBG_EXTENDED) Dbprintf("IsTrailerAccessAllowed: AC_KEYA_READ");
return false;
}
case AC_KEYA_WRITE: {
if (MF_DBGLEVEL >= MF_DBG_EXTENDED) Dbprintf("IsTrailerAccessAllowed: AC_KEYA_WRITE");
return ((keytype == AUTHKEYA && (AC == 0x00 || AC == 0x01))
|| (keytype == AUTHKEYB && (AC == 0x04 || AC == 0x03)));
}
case AC_KEYB_READ: {
if (MF_DBGLEVEL >= MF_DBG_EXTENDED) Dbprintf("IsTrailerAccessAllowed: AC_KEYB_READ");
return (keytype == AUTHKEYA && (AC == 0x00 || AC == 0x02 || AC == 0x01));
}
case AC_KEYB_WRITE: {
if (MF_DBGLEVEL >= MF_DBG_EXTENDED) Dbprintf("IsTrailerAccessAllowed: AC_KEYB_WRITE");
return ((keytype == AUTHKEYA && (AC == 0x00 || AC == 0x04))
|| (keytype == AUTHKEYB && (AC == 0x04 || AC == 0x03)));
}
case AC_AC_READ: {
if (MF_DBGLEVEL >= MF_DBG_EXTENDED) Dbprintf("IsTrailerAccessAllowed: AC_AC_READ");
return ((keytype == AUTHKEYA)
|| (keytype == AUTHKEYB && !(AC == 0x00 || AC == 0x02 || AC == 0x01)));
}
case AC_AC_WRITE: {
if (MF_DBGLEVEL >= MF_DBG_EXTENDED) Dbprintf("IsTrailerAccessAllowed: AC_AC_WRITE");
return ((keytype == AUTHKEYA && (AC == 0x01))
|| (keytype == AUTHKEYB && (AC == 0x03 || AC == 0x05)));
}
default:
return false;
}
}
static bool IsDataAccessAllowed(uint8_t blockNo, uint8_t keytype, uint8_t action) {
uint8_t sector_trailer[16];
emlGetMem(sector_trailer, SectorTrailer(blockNo), 1);
uint8_t sector_block;
if (blockNo <= MIFARE_2K_MAXBLOCK) {
sector_block = blockNo & 0x03;
} else {
sector_block = (blockNo & 0x0f) / 5;
}
uint8_t AC;
switch (sector_block) {
case 0x00: {
AC = ((sector_trailer[7] >> 2) & 0x04)
| ((sector_trailer[8] << 1) & 0x02)
| ((sector_trailer[8] >> 4) & 0x01);
if (MF_DBGLEVEL >= MF_DBG_EXTENDED) Dbprintf("IsDataAccessAllowed: case 0x00 - %02x", AC);
break;
}
case 0x01: {
AC = ((sector_trailer[7] >> 3) & 0x04)
| ((sector_trailer[8] >> 0) & 0x02)
| ((sector_trailer[8] >> 5) & 0x01);
if (MF_DBGLEVEL >= MF_DBG_EXTENDED) Dbprintf("IsDataAccessAllowed: case 0x01 - %02x", AC);
break;
}
case 0x02: {
AC = ((sector_trailer[7] >> 4) & 0x04)
| ((sector_trailer[8] >> 1) & 0x02)
| ((sector_trailer[8] >> 6) & 0x01);
if (MF_DBGLEVEL >= MF_DBG_EXTENDED) Dbprintf("IsDataAccessAllowed: case 0x02 - %02x", AC);
break;
}
default:
if (MF_DBGLEVEL >= MF_DBG_EXTENDED) Dbprintf("IsDataAccessAllowed: Error");
return false;
}
switch (action) {
case AC_DATA_READ: {
if (MF_DBGLEVEL >= MF_DBG_EXTENDED) Dbprintf("IsDataAccessAllowed - AC_DATA_READ: OK");
return ((keytype == AUTHKEYA && !(AC == 0x03 || AC == 0x05 || AC == 0x07))
|| (keytype == AUTHKEYB && !(AC == 0x07)));
}
case AC_DATA_WRITE: {
if (MF_DBGLEVEL >= MF_DBG_EXTENDED) Dbprintf("IsDataAccessAllowed - AC_DATA_WRITE: OK");
return ((keytype == AUTHKEYA && (AC == 0x00))
|| (keytype == AUTHKEYB && (AC == 0x00 || AC == 0x04 || AC == 0x06 || AC == 0x03)));
}
case AC_DATA_INC: {
if (MF_DBGLEVEL >= MF_DBG_EXTENDED) Dbprintf("IsDataAccessAllowed - AC_DATA_INC: OK");
return ((keytype == AUTHKEYA && (AC == 0x00))
|| (keytype == AUTHKEYB && (AC == 0x00 || AC == 0x06)));
}
case AC_DATA_DEC_TRANS_REST: {
if (MF_DBGLEVEL >= MF_DBG_EXTENDED) Dbprintf("AC_DATA_DEC_TRANS_REST: OK");
return ((keytype == AUTHKEYA && (AC == 0x00 || AC == 0x06 || AC == 0x01))
|| (keytype == AUTHKEYB && (AC == 0x00 || AC == 0x06 || AC == 0x01)));
}
}
return false;
}
static bool IsAccessAllowed(uint8_t blockNo, uint8_t keytype, uint8_t action) {
if (IsSectorTrailer(blockNo)) {
return IsTrailerAccessAllowed(blockNo, keytype, action);
} else {
return IsDataAccessAllowed(blockNo, keytype, action);
}
}
static bool MifareSimInit(uint16_t flags, uint8_t *datain, tag_response_info_t **responses, uint32_t *cuid, uint8_t *uid_len, uint8_t **rats, uint8_t *rats_len) {
// SPEC: https://www.nxp.com/docs/en/application-note/AN10833.pdf
// ATQA
static uint8_t rATQA_Mini[] = {0x04, 0x00}; // indicate Mifare classic Mini 4Byte UID
static uint8_t rATQA_1k[] = {0x04, 0x00}; // indicate Mifare classic 1k 4Byte UID
static uint8_t rATQA_2k[] = {0x04, 0x00}; // indicate Mifare classic 2k 4Byte UID
static uint8_t rATQA_4k[] = {0x02, 0x00}; // indicate Mifare classic 4k 4Byte UID
// SAK
static uint8_t rSAK_Mini = 0x09; // mifare Mini
static uint8_t rSAK_1k = 0x08; // mifare 1k
static uint8_t rSAK_2k = 0x08; // mifare 2k with RATS support
static uint8_t rSAK_4k = 0x18; // mifare 4k
static uint8_t rUIDBCC1[] = {0x00, 0x00, 0x00, 0x00, 0x00}; // UID 1st cascade level
static uint8_t rUIDBCC2[] = {0x00, 0x00, 0x00, 0x00, 0x00}; // UID 2nd cascade level
static uint8_t rUIDBCC3[] = {0x00, 0x00, 0x00, 0x00, 0x00}; // UID 3nd cascade level
static uint8_t rATQA[] = {0x00, 0x00}; // Current ATQA
static uint8_t rSAK[] = {0x00, 0x00, 0x00}; // Current SAK, CRC
static uint8_t rSAKuid[] = {0x04, 0xda, 0x17}; // UID incomplete cascade bit, CRC
// RATS answer for 2K NXP mifare classic (with CRC)
static uint8_t rRATS[] = {0x0c, 0x75, 0x77, 0x80, 0x02, 0xc1, 0x05, 0x2f, 0x2f, 0x01, 0xbc, 0xd6, 0x60, 0xd3};
*uid_len = 0;
// By default use 1K tag
memcpy(rATQA, rATQA_1k, sizeof(rATQA));
rSAK[0] = rSAK_1k;
//by default RATS not supported
*rats_len = 0;
*rats = NULL;
// -- Determine the UID
// Can be set from emulator memory or incoming data
// Length: 4,7,or 10 bytes
// Get UID, SAK, ATQA from EMUL
if ((flags & FLAG_UID_IN_EMUL) == FLAG_UID_IN_EMUL) {
uint8_t block0[16];
emlGetMemBt(block0, 0, 16);
// If uid size defined, copy only uid from EMUL to use, backward compatibility for 'hf_colin.c', 'hf_mattyrun.c'
if ((flags & (FLAG_4B_UID_IN_DATA | FLAG_7B_UID_IN_DATA | FLAG_10B_UID_IN_DATA)) != 0) {
memcpy(datain, block0, 10); // load 10bytes from EMUL to the datain pointer. to be used below.
} else {
// Check for 4 bytes uid: bcc corrected and single size uid bits in ATQA
if ((block0[0] ^ block0[1] ^ block0[2] ^ block0[3]) == block0[4] && (block0[6] & 0xc0) == 0) {
flags |= FLAG_4B_UID_IN_DATA;
memcpy(datain, block0, 4);
rSAK[0] = block0[5];
memcpy(rATQA, &block0[6], sizeof(rATQA));
}
// Check for 7 bytes UID: double size uid bits in ATQA
else if ((block0[8] & 0xc0) == 0x40) {
flags |= FLAG_7B_UID_IN_DATA;
memcpy(datain, block0, 7);
rSAK[0] = block0[7];
memcpy(rATQA, &block0[8], sizeof(rATQA));
} else {
Dbprintf("[-] ERROR: Invalid dump. UID/SAK/ATQA not found");
return false;
}
}
}
// Tune tag type, if defined directly
// Otherwise use defined by default or extracted from EMUL
if ((flags & FLAG_MF_MINI) == FLAG_MF_MINI) {
memcpy(rATQA, rATQA_Mini, sizeof(rATQA));
rSAK[0] = rSAK_Mini;
Dbprintf("Mifare Mini");
} else if ((flags & FLAG_MF_1K) == FLAG_MF_1K) {
memcpy(rATQA, rATQA_1k, sizeof(rATQA));
rSAK[0] = rSAK_1k;
Dbprintf("Mifare 1K");
} else if ((flags & FLAG_MF_2K) == FLAG_MF_2K) {
memcpy(rATQA, rATQA_2k, sizeof(rATQA));
rSAK[0] = rSAK_2k;
*rats = rRATS;
*rats_len = sizeof(rRATS);
Dbprintf("Mifare 2K with RATS support");
} else if ((flags & FLAG_MF_4K) == FLAG_MF_4K) {
memcpy(rATQA, rATQA_4k, sizeof(rATQA));
rSAK[0] = rSAK_4k;
Dbprintf("Mifare 4K");
}
// Prepare UID arrays
if ((flags & FLAG_4B_UID_IN_DATA) == FLAG_4B_UID_IN_DATA) { // get UID from datain
memcpy(rUIDBCC1, datain, 4);
*uid_len = 4;
if (MF_DBGLEVEL >= MF_DBG_EXTENDED) Dbprintf("MifareSimInit - FLAG_4B_UID_IN_DATA => Get UID from datain: %02X - Flag: %02X - UIDBCC1: %02X", FLAG_4B_UID_IN_DATA, flags, rUIDBCC1);
// save CUID
*cuid = bytes_to_num(rUIDBCC1, 4);
// BCC
rUIDBCC1[4] = rUIDBCC1[0] ^ rUIDBCC1[1] ^ rUIDBCC1[2] ^ rUIDBCC1[3];
if (MF_DBGLEVEL >= MF_DBG_NONE) {
Dbprintf("4B UID: %02x%02x%02x%02x", rUIDBCC1[0], rUIDBCC1[1], rUIDBCC1[2], rUIDBCC1[3]);
}
// Correct uid size bits in ATQA
rATQA[0] = (rATQA[0] & 0x3f) | 0x00; // single size uid
} else if ((flags & FLAG_7B_UID_IN_DATA) == FLAG_7B_UID_IN_DATA) {
memcpy(&rUIDBCC1[1], datain, 3);
memcpy(rUIDBCC2, datain + 3, 4);
*uid_len = 7;
if (MF_DBGLEVEL >= MF_DBG_EXTENDED) Dbprintf("MifareSimInit - FLAG_7B_UID_IN_DATA => Get UID from datain: %02X - Flag: %02X - UIDBCC1: %02X", FLAG_7B_UID_IN_DATA, flags, rUIDBCC1);
// save CUID
*cuid = bytes_to_num(rUIDBCC2, 4);
// CascadeTag, CT
rUIDBCC1[0] = MIFARE_SELECT_CT;
// BCC
rUIDBCC1[4] = rUIDBCC1[0] ^ rUIDBCC1[1] ^ rUIDBCC1[2] ^ rUIDBCC1[3];
rUIDBCC2[4] = rUIDBCC2[0] ^ rUIDBCC2[1] ^ rUIDBCC2[2] ^ rUIDBCC2[3];
if (MF_DBGLEVEL >= MF_DBG_NONE) {
Dbprintf("7B UID: %02x %02x %02x %02x %02x %02x %02x",
rUIDBCC1[1], rUIDBCC1[2], rUIDBCC1[3], rUIDBCC2[0], rUIDBCC2[1], rUIDBCC2[2], rUIDBCC2[3]);
}
// Correct uid size bits in ATQA
rATQA[0] = (rATQA[0] & 0x3f) | 0x40; // double size uid
} else if ((flags & FLAG_10B_UID_IN_DATA) == FLAG_10B_UID_IN_DATA) {
memcpy(&rUIDBCC1[1], datain, 3);
memcpy(&rUIDBCC2[1], datain + 3, 3);
memcpy(rUIDBCC3, datain + 6, 4);
*uid_len = 10;
if (MF_DBGLEVEL >= MF_DBG_EXTENDED) Dbprintf("MifareSimInit - FLAG_10B_UID_IN_DATA => Get UID from datain: %02X - Flag: %02X - UIDBCC1: %02X", FLAG_10B_UID_IN_DATA, flags, rUIDBCC1);
// save CUID
*cuid = bytes_to_num(rUIDBCC3, 4);
// CascadeTag, CT
rUIDBCC1[0] = MIFARE_SELECT_CT;
rUIDBCC2[0] = MIFARE_SELECT_CT;
// BCC
rUIDBCC1[4] = rUIDBCC1[0] ^ rUIDBCC1[1] ^ rUIDBCC1[2] ^ rUIDBCC1[3];
rUIDBCC2[4] = rUIDBCC2[0] ^ rUIDBCC2[1] ^ rUIDBCC2[2] ^ rUIDBCC2[3];
rUIDBCC3[4] = rUIDBCC3[0] ^ rUIDBCC3[1] ^ rUIDBCC3[2] ^ rUIDBCC3[3];
if (MF_DBGLEVEL >= MF_DBG_NONE) {
Dbprintf("10B UID: %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x",
rUIDBCC1[1], rUIDBCC1[2], rUIDBCC1[3],
rUIDBCC2[1], rUIDBCC2[2], rUIDBCC2[3],
rUIDBCC3[0], rUIDBCC3[1], rUIDBCC3[2], rUIDBCC3[3]
);
}
// Correct uid size bits in ATQA
rATQA[0] = (rATQA[0] & 0x3f) | 0x80; // triple size uid
} else {
Dbprintf("[-] ERROR: UID size not defined");
return false;
}
// Calculate actual CRC
AddCrc14A(rSAK, sizeof(rSAK) - 2);
#define TAG_RESPONSE_COUNT 6
static tag_response_info_t responses_init[TAG_RESPONSE_COUNT] = {
{ .response = rATQA, .response_n = sizeof(rATQA) }, // Answer to request - respond with card type
{ .response = rUIDBCC1, .response_n = sizeof(rUIDBCC1) }, // Anticollision cascade1 - respond with first part of uid
{ .response = rUIDBCC2, .response_n = sizeof(rUIDBCC2) }, // Anticollision cascade2 - respond with 2nd part of uid
{ .response = rUIDBCC3, .response_n = sizeof(rUIDBCC3) }, // Anticollision cascade3 - respond with 3th part of uid
{ .response = rSAK, .response_n = sizeof(rSAK) }, //
{ .response = rSAKuid, .response_n = sizeof(rSAKuid) } //
};
// Prepare ("precompile") the responses of the anticollision phase.
// There will be not enough time to do this at the moment the reader sends its REQA or SELECT
// There are 6 predefined responses with a total of 23 bytes data to transmit.
// Coded responses need one byte per bit to transfer (data, parity, start, stop, correction)
// 23 * 8 data bits, 23 * 1 parity bits, 6 start bits, 6 stop bits, 6 correction bits -> need 225 bytes buffer
#define ALLOCATED_TAG_MODULATION_BUFFER_SIZE 225
uint8_t *free_buffer = BigBuf_malloc(ALLOCATED_TAG_MODULATION_BUFFER_SIZE);
// modulation buffer pointer and current buffer free space size
uint8_t *free_buffer_pointer = free_buffer;
size_t free_buffer_size = ALLOCATED_TAG_MODULATION_BUFFER_SIZE;
for (size_t i = 0; i < TAG_RESPONSE_COUNT; i++) {
if (prepare_allocated_tag_modulation(&responses_init[i], &free_buffer_pointer, &free_buffer_size) == false) {
Dbprintf("Not enough modulation buffer size, exit after %d elements", i);
return false;
}
}
*responses = responses_init;
// indices into responses array:
#define ATQA 0
#define UIDBCC1 1
#define UIDBCC2 2
#define UIDBCC3 3
#define SAK 4
#define SAKuid 5
return true;
}
/**
*MIFARE 1K simulate.
*
*@param flags :
* FLAG_INTERACTIVE - In interactive mode, we are expected to finish the operation with an ACK
* FLAG_4B_UID_IN_DATA - means that there is a 4-byte UID in the data-section, we're expected to use that
* FLAG_7B_UID_IN_DATA - means that there is a 7-byte UID in the data-section, we're expected to use that
* FLAG_10B_UID_IN_DATA - use 10-byte UID in the data-section not finished
* FLAG_NR_AR_ATTACK - means we should collect NR_AR responses for bruteforcing later
*@param exitAfterNReads, exit simulation after n blocks have been read, 0 is infinite ...
* (unless reader attack mode enabled then it runs util it gets enough nonces to recover all keys attmpted)
*/
void Mifare1ksim(uint16_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t *datain) {
tag_response_info_t *responses;
uint8_t cardSTATE = MFEMUL_NOFIELD;
uint8_t uid_len = 0; // 4,7, 10
uint32_t cuid = 0;
int vHf = 0; // in mV
uint32_t selTimer = 0;
uint32_t authTimer = 0;
uint8_t blockNo;
uint32_t nr;
uint32_t ar;
bool encrypted_data;
uint8_t cardWRBL = 0;
uint8_t cardAUTHSC = 0;
uint8_t cardAUTHKEY = AUTHKEYNONE; // no authentication
uint32_t cardRr = 0;
uint32_t ans = 0;
uint32_t cardINTREG = 0;
uint8_t cardINTBLOCK = 0;
struct Crypto1State mpcs = {0, 0};
struct Crypto1State *pcs;
pcs = &mpcs;
uint32_t numReads = 0; //Counts numer of times reader reads a block
uint8_t receivedCmd[MAX_MIFARE_FRAME_SIZE] = {0x00};
uint8_t receivedCmd_dec[MAX_MIFARE_FRAME_SIZE] = {0x00};
uint8_t receivedCmd_par[MAX_MIFARE_PARITY_SIZE] = {0x00};
uint16_t receivedCmd_len;
uint8_t response[MAX_MIFARE_FRAME_SIZE] = {0x00};
uint8_t response_par[MAX_MIFARE_PARITY_SIZE] = {0x00};
uint8_t *rats = NULL;
uint8_t rats_len = 0;
uint8_t rAUTH_AT[] = {0x00, 0x00, 0x00, 0x00};
//Here, we collect UID,sector,keytype,NT,AR,NR,NT2,AR2,NR2
// This will be used in the reader-only attack.
//allow collecting up to 7 sets of nonces to allow recovery of up to 7 keys
#define ATTACK_KEY_COUNT 7 // keep same as define in cmdhfmf.c -> readerAttack() (Cannot be more than 7)
nonces_t ar_nr_resp[ATTACK_KEY_COUNT * 2]; //*2 for 2 separate attack types (nml, moebius) 36 * 7 * 2 bytes = 504 bytes
memset(ar_nr_resp, 0x00, sizeof(ar_nr_resp));
uint8_t ar_nr_collected[ATTACK_KEY_COUNT * 2]; //*2 for 2nd attack type (moebius)
memset(ar_nr_collected, 0x00, sizeof(ar_nr_collected));
uint8_t nonce1_count = 0;
uint8_t nonce2_count = 0;
uint8_t moebius_n_count = 0;
bool gettingMoebius = false;
uint8_t mM = 0; //moebius_modifier for collection storage
// Authenticate response - nonce
uint8_t rAUTH_NT[4];
uint8_t rAUTH_NT_keystream[4];
uint32_t nonce = 0;
tUart *uart = GetUart();
// free eventually allocated BigBuf memory but keep Emulator Memory
BigBuf_free_keep_EM();
if (MifareSimInit(flags, datain, &responses, &cuid, &uid_len, &rats, &rats_len) == false) {
BigBuf_free_keep_EM();
return;
}
// We need to listen to the high-frequency, peak-detected path.
iso14443a_setup(FPGA_HF_ISO14443A_TAGSIM_LISTEN);
// clear trace
clear_trace();
set_tracing(true);
LED_D_ON();
ResetSspClk();
bool finished = false;
bool button_pushed = BUTTON_PRESS();
while (!button_pushed && !finished && !usb_poll_validate_length()) {
WDT_HIT();
// find reader field
if (cardSTATE == MFEMUL_NOFIELD) {
vHf = (MAX_ADC_HF_VOLTAGE_RDV40 * AvgAdc(ADC_CHAN_HF)) >> 10;
if (vHf > MF_MINFIELDV) {
cardSTATE_TO_IDLE();
LED_A_ON();
}
button_pushed = BUTTON_PRESS();
continue;
}
//Now, get data
int res = EmGetCmd(receivedCmd, &receivedCmd_len, receivedCmd_par);
if (res == 2) { //Field is off!
LEDsoff();
cardSTATE = MFEMUL_NOFIELD;
if (MF_DBGLEVEL >= MF_DBG_EXTENDED) Dbprintf("cardSTATE = MFEMUL_NOFIELD");
continue;
} else if (res == 1) { // button pressed
button_pushed = true;
if (MF_DBGLEVEL >= MF_DBG_EXTENDED) Dbprintf("Button pressed");
break;
}
// WUPA in HALTED state or REQA or WUPA in any other state
if (receivedCmd_len == 1 && ((receivedCmd[0] == ISO14443A_CMD_REQA && cardSTATE != MFEMUL_HALTED) || receivedCmd[0] == ISO14443A_CMD_WUPA)) {
selTimer = GetTickCount();
if (MF_DBGLEVEL >= MF_DBG_EXTENDED) Dbprintf("EmSendPrecompiledCmd(&responses[ATQA]);");
EmSendPrecompiledCmd(&responses[ATQA]);
// init crypto block
crypto1_destroy(pcs);
cardAUTHKEY = AUTHKEYNONE;
nonce = prng_successor(selTimer, 32);
// prepare NT for nested authentication
num_to_bytes(nonce, 4, rAUTH_NT);
num_to_bytes(cuid ^ nonce, 4, rAUTH_NT_keystream);
LED_B_OFF();
LED_C_OFF();
cardSTATE = MFEMUL_SELECT1;
continue;
}
switch (cardSTATE) {
case MFEMUL_NOFIELD:
if (MF_DBGLEVEL >= MF_DBG_EXTENDED) Dbprintf("MFEMUL_NOFIELD");
case MFEMUL_HALTED:
if (MF_DBGLEVEL >= MF_DBG_EXTENDED) Dbprintf("MFEMUL_HALTED");
case MFEMUL_IDLE: {
LogTrace(uart->output, uart->len, uart->startTime * 16 - DELAY_AIR2ARM_AS_TAG, uart->endTime * 16 - DELAY_AIR2ARM_AS_TAG, uart->parity, true);
if (MF_DBGLEVEL >= MF_DBG_EXTENDED) Dbprintf("MFEMUL_IDLE");
break;
}
// The anti-collision sequence, which is a mandatory part of the card activation sequence.
// It auto with 4-byte UID (= Single Size UID),
// 7 -byte UID (= Double Size UID) or 10-byte UID (= Triple Size UID).
// Cascade Level 1
//
// In the Cascade Level 1, the card send the anti-collision command CL1 (0x93) and the PICC returns
// either the 4-byte UID (UID0...UID4) and one-byte BCC
// or a Cascade Tag (CT) followed by the first 3 byte of the UID (UID0...UID2) and onebyte BCC.
//
// The CT (0x88) indicates that the UID is not yet complete, and another Cascade Level is needed
//
// The UID0 byte of a 4-byte UID must not be 0x88.
// The CL1 then must be selected, using the Select command CL1 (0x93). The PICC returns its SAK CL1, which indicates
// whether the UID is complete or not, and (if so),
// the type of card and whether the card supports T=CL.
case MFEMUL_SELECT1: {
// select all - 0x93 0x20 (Anti Collision CL1)
if (MF_DBGLEVEL >= MF_DBG_EXTENDED) Dbprintf("cardSTATE = MFEMUL_SELECT1 - receivedCmd_len: %d - receivedCmd[0]: %02x - receivedCmd[1]: %02x", receivedCmd_len, receivedCmd[0], receivedCmd[1]);
if (receivedCmd_len == 2 && (receivedCmd[0] == ISO14443A_CMD_ANTICOLL_OR_SELECT && receivedCmd[1] == 0x20)) {
if (MF_DBGLEVEL >= MF_DBG_EXTENDED) Dbprintf("SELECT ALL CL1 received - EmSendPrecompiledCmd(%02x)", &responses[UIDBCC1]);
EmSendPrecompiledCmd(&responses[UIDBCC1]);
break;
}
// select card - 0x93 0x70 (Select CL1)
if (receivedCmd_len == 9 &&
(receivedCmd[0] == ISO14443A_CMD_ANTICOLL_OR_SELECT &&
receivedCmd[1] == 0x70 &&
memcmp(&receivedCmd[2], responses[UIDBCC1].response, 4) == 0)) {
if (MF_DBGLEVEL >= MF_DBG_EXTENDED) Dbprintf("SELECT CL1 %02x%02x%02x%02x received", receivedCmd[2], receivedCmd[3], receivedCmd[4], receivedCmd[5]);
// Send SAK according UID len
switch (uid_len) {
case 4:
// UID completed
EmSendPrecompiledCmd(&responses[SAK]);
LED_B_ON();
cardSTATE = MFEMUL_WORK;
if (MF_DBGLEVEL >= MF_DBG_EXTENDED) Dbprintf("[MFEMUL_SELECT1] cardSTATE = MFEMUL_WORK");
break;
case 7:
// SAK => Need another select round
EmSendPrecompiledCmd(&responses[SAKuid]);
cardSTATE = MFEMUL_SELECT2;
if (MF_DBGLEVEL >= MF_DBG_EXTENDED) Dbprintf("[MFEMUL_SELECT1] cardSTATE = MFEMUL_SELECT2");
break;
case 10:
// SAK => Need another select round
EmSendPrecompiledCmd(&responses[SAKuid]);
cardSTATE = MFEMUL_SELECT2;
if (MF_DBGLEVEL >= MF_DBG_EXTENDED) Dbprintf("[MFEMUL_SELECT1] cardSTATE = MFEMUL_SELECT2");
break;
default:
break;
} // End Switch (uid_len)
} else {
// IDLE
cardSTATE_TO_IDLE();
if (MF_DBGLEVEL >= MF_DBG_EXTENDED) Dbprintf("[MFEMUL_SELECT1] cardSTATE = MFEMUL_IDLE");
}
// Break Case MFEMUL_SELECT1
break;
}
// Cascade Level 2
//
// If the UID is not yet complete, the PCD continues with an anti-collision CL2 command (0x95),
// and the PICC returns
// • either the last 4 bytes of the Double Size UID (UID3...UID6) and one-byte BCC,
// • or a Cascade Tag (CT) followed by the next 3 bytes of the Triple Size UID (UID3...UID5) and one-byte BCC.
// The CT (0x88) indicates that the UID is not yet complete, and another Cascade Level has to follow.
//
// The UID3 byte of a 7 byte or 10-byte UID must not be 0x88
// The CL2 then must be selected, using the Select command CL2 (0x95).
// The PICC returns its SAK CL2, which indicates
// whether the UID is complete or not, and (if so),
// the type of card and whether the card supports T=CL.
// select all cl2 - 0x95 0x20
case MFEMUL_SELECT2: {
if (receivedCmd_len == 2 &&
(receivedCmd[0] == ISO14443A_CMD_ANTICOLL_OR_SELECT_2 && receivedCmd[1] == 0x20)) {
if (MF_DBGLEVEL >= MF_DBG_EXTENDED) Dbprintf("[MFEMUL_SELECT2] SELECT ALL CL2 received");
EmSendPrecompiledCmd(&responses[UIDBCC2]);
break;
}
// select cl2 card - 0x95 0x70 xxxxxxxxxxxx
if (receivedCmd_len == 9 &&
(receivedCmd[0] == ISO14443A_CMD_ANTICOLL_OR_SELECT_2 &&
receivedCmd[1] == 0x70 &&
memcmp(&receivedCmd[2], responses[UIDBCC2].response, 4) == 0)) {
switch (uid_len) {
case 7:
if (MF_DBGLEVEL >= MF_DBG_EXTENDED) Dbprintf("[MFEMUL_SELECT2] SELECT CL2 %02x%02x%02x%02x received", receivedCmd[2], receivedCmd[3], receivedCmd[4], receivedCmd[5]);
// UID completed
EmSendPrecompiledCmd(&responses[SAK]);
cardSTATE = MFEMUL_WORK;
LED_B_ON();
break;
case 10:
// SAK => Need another select round
EmSendPrecompiledCmd(&responses[SAKuid]);
cardSTATE = MFEMUL_SELECT3;
if (MF_DBGLEVEL >= MF_DBG_EXTENDED) Dbprintf("[MFEMUL_SELECT2] cardSTATE = MFEMUL_SELECT3");
default:
break;
}
} else {
// IDLE
cardSTATE_TO_IDLE();
if (MF_DBGLEVEL >= MF_DBG_EXTENDED) Dbprintf("[MFEMUL_SELECT2] cardSTATE = MFEMUL_IDLE");
}
// Break Case MFEMUL_SELECT2
break;
}
// Cascade Level 3
// Select command CL3 (0x97)
//
// If the UID is not yet complete, the PCD continues with an anti-collision CL3 command (0x97)
// and the PICC returns the last 4 bytes of the Triple Size UID (UID6...UID9) and one-byte BCC.
// The PICC returns its SAK CL3, which indicates the type of card and whether the card supports T=CL
case MFEMUL_SELECT3: {
if (!uid_len) {
LogTrace(uart->output, uart->len, uart->startTime * 16 - DELAY_AIR2ARM_AS_TAG, uart->endTime * 16 - DELAY_AIR2ARM_AS_TAG, uart->parity, true);
break;
}
if (receivedCmd_len == 2 && (receivedCmd[0] == ISO14443A_CMD_ANTICOLL_OR_SELECT_3 && receivedCmd[1] == 0x20)) {
EmSendPrecompiledCmd(&responses[UIDBCC3]);
break;
}
if (receivedCmd_len == 9 &&
(receivedCmd[0] == ISO14443A_CMD_ANTICOLL_OR_SELECT_3 &&
receivedCmd[1] == 0x70 &&
memcmp(&receivedCmd[2], responses[UIDBCC3].response, 4) == 0)) {
// UID completed
EmSendPrecompiledCmd(&responses[SAK]);
cardSTATE = MFEMUL_WORK;
LED_B_ON();
if (MF_DBGLEVEL >= MF_DBG_EXTENDED) {
Dbprintf("[MFEMUL_SELECT3] --> WORK. anticol3 time: %d", GetTickCount() - selTimer);
Dbprintf("[MFEMUL_SELECT3] cardSTATE = MFEMUL_WORK");
}
continue;
} else {
// IDLE
cardSTATE_TO_IDLE();
if (MF_DBGLEVEL >= MF_DBG_EXTENDED) Dbprintf("[MFEMUL_SELECT3] cardSTATE = MFEMUL_IDLE");
}
// Break Case MFEMUL_SELECT3
break;
}
// WORK
case MFEMUL_WORK: {
if (MF_DBGLEVEL >= MF_DBG_EXTENDED) Dbprintf("[MFEMUL_WORK] Enter in case");
if (receivedCmd_len == 0) {
if (MF_DBGLEVEL >= MF_DBG_EXTENDED) Dbprintf("[MFEMUL_WORK] NO CMD received");
break;
}
encrypted_data = (cardAUTHKEY != AUTHKEYNONE);
if (encrypted_data) {
// decrypt seqence
mf_crypto1_decryptEx(pcs, receivedCmd, receivedCmd_len, receivedCmd_dec);
if (MF_DBGLEVEL >= MF_DBG_EXTENDED) Dbprintf("[MFEMUL_WORK] Decrypt seqence");
} else {
// Data in clear
memcpy(receivedCmd_dec, receivedCmd, receivedCmd_len);
}
if (!CheckCrc14A(receivedCmd_dec, receivedCmd_len)) { // all commands must have a valid CRC
EmSend4bit(encrypted_data ? mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA) : CARD_NACK_NA);
if (MF_DBGLEVEL >= MF_DBG_EXTENDED) Dbprintf("[MFEMUL_WORK] All commands must have a valid CRC %02X (%d)", receivedCmd_dec, receivedCmd_len);
break;
}
if (receivedCmd_len == 4 && (receivedCmd_dec[0] == MIFARE_AUTH_KEYA || receivedCmd_dec[0] == MIFARE_AUTH_KEYB)) {
// Reader asks for AUTH: 6X XX
// RCV: 60 XX => Using KEY A
// RCV: 61 XX => Using KEY B
// XX: Block number
// if authenticating to a block that shouldn't exist - as long as we are not doing the reader attack
if (receivedCmd_dec[1] > MIFARE_4K_MAXBLOCK && !((flags & FLAG_NR_AR_ATTACK) == FLAG_NR_AR_ATTACK)) {
EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA));
if (MF_DBGLEVEL >= MF_DBG_EXTENDED) Dbprintf("Reader tried to operate (0x%02x) on out of range block: %d (0x%02x), nacking", receivedCmd_dec[0], receivedCmd_dec[1], receivedCmd_dec[1]);
break;
}
authTimer = GetTickCount();
// received block num -> sector
// Example: 6X [00]
// 4K tags have 16 blocks per sector 32..39
cardAUTHSC = MifareBlockToSector(receivedCmd_dec[1]);
// cardAUTHKEY: 60 => Auth use Key A
// cardAUTHKEY: 61 => Auth use Key B
cardAUTHKEY = receivedCmd_dec[0] & 0x01;
if (MF_DBGLEVEL >= MF_DBG_EXTENDED) Dbprintf("[MFEMUL_WORK] KEY %c: %012" PRIx64, (cardAUTHKEY == 0) ? 'A' : 'B', emlGetKey(cardAUTHSC, cardAUTHKEY));
// first authentication
crypto1_destroy(pcs);
// Load key into crypto
crypto1_create(pcs, emlGetKey(cardAUTHSC, cardAUTHKEY));
if (!encrypted_data) {
// Receive Cmd in clear txt
// Update crypto state (UID ^ NONCE)
crypto1_word(pcs, cuid ^ nonce, 0);
// rAUTH_NT contains prepared nonce for authenticate
EmSendCmd(rAUTH_NT, sizeof(rAUTH_NT));
if (MF_DBGLEVEL >= MF_DBG_EXTENDED) Dbprintf("[MFEMUL_WORK] Reader authenticating for block %d (0x%02x) with key %c - nonce: %02X - ciud: %02X", receivedCmd_dec[1], receivedCmd_dec[1], (cardAUTHKEY == 0) ? 'A' : 'B', rAUTH_AT, cuid);
} else {
// nested authentication
/*
ans = nonce ^ crypto1_word(pcs, cuid ^ nonce, 0);
num_to_bytes(ans, 4, rAUTH_AT);
*/
// rAUTH_NT, rAUTH_NT_keystream contains prepared nonce and keystream for nested authentication
// we need calculate parity bits for non-encrypted sequence
mf_crypto1_encryptEx(pcs, rAUTH_NT, rAUTH_NT_keystream, response, 4, response_par);
EmSendCmdPar(response, 4, response_par);
if (MF_DBGLEVEL >= MF_DBG_EXTENDED) Dbprintf("[MFEMUL_WORK] Reader doing nested authentication for block %d (0x%02x) with key %c", receivedCmd_dec[1], receivedCmd_dec[1], (cardAUTHKEY == 0) ? 'A' : 'B');
}
cardSTATE = MFEMUL_AUTH1;
if (MF_DBGLEVEL >= MF_DBG_EXTENDED) Dbprintf("[MFEMUL_WORK] cardSTATE = MFEMUL_AUTH1 - rAUTH_NT: %02X", rAUTH_NT);
break;
}
// rule 13 of 7.5.3. in ISO 14443-4. chaining shall be continued
// BUT... ACK --> NACK
if (receivedCmd_len == 1 && receivedCmd_dec[0] == CARD_ACK) {
EmSend4bit(encrypted_data ? mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA) : CARD_NACK_NA);
break;
}
// rule 12 of 7.5.3. in ISO 14443-4. R(NAK) --> R(ACK)
if (receivedCmd_len == 1 && receivedCmd_dec[0] == CARD_NACK_NA) {
EmSend4bit(encrypted_data ? mf_crypto1_encrypt4bit(pcs, CARD_ACK) : CARD_ACK);
break;
}
// case MFEMUL_WORK => if Cmd is Read, Write, Inc, Dec, Restore, Transfert
if (receivedCmd_len == 4 && (receivedCmd_dec[0] == ISO14443A_CMD_READBLOCK
|| receivedCmd_dec[0] == ISO14443A_CMD_WRITEBLOCK
|| receivedCmd_dec[0] == MIFARE_CMD_INC
|| receivedCmd_dec[0] == MIFARE_CMD_DEC
|| receivedCmd_dec[0] == MIFARE_CMD_RESTORE
|| receivedCmd_dec[0] == MIFARE_CMD_TRANSFER)) {
// all other commands must be encrypted (authenticated)
if (!encrypted_data) {
EmSend4bit(CARD_NACK_NA);
if (MF_DBGLEVEL >= MF_DBG_EXTENDED) Dbprintf("[MFEMUL_WORK] Commands must be encrypted (authenticated)");
break;
}
// Check if Block num is not too far
if (receivedCmd_dec[1] > MIFARE_4K_MAXBLOCK) {
EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA));
if (MF_DBGLEVEL >= MF_DBG_ERROR) Dbprintf("[MFEMUL_WORK] Reader tried to operate (0x%02x) on out of range block: %d (0x%02x), nacking", receivedCmd_dec[0], receivedCmd_dec[1], receivedCmd_dec[1]);
break;
}
if (MifareBlockToSector(receivedCmd_dec[1]) != cardAUTHSC) {
EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA));
if (MF_DBGLEVEL >= MF_DBG_ERROR) Dbprintf("[MFEMUL_WORK] Reader tried to operate (0x%02x) on block (0x%02x) not authenticated for (0x%02x), nacking", receivedCmd_dec[0], receivedCmd_dec[1], cardAUTHSC);
break;
}
}
// case MFEMUL_WORK => CMD READ block
if (receivedCmd_len == 4 && receivedCmd_dec[0] == ISO14443A_CMD_READBLOCK) {
blockNo = receivedCmd_dec[1];
if (MF_DBGLEVEL >= MF_DBG_EXTENDED) Dbprintf("[MFEMUL_WORK] Reader reading block %d (0x%02x)", blockNo, blockNo);
emlGetMem(response, blockNo, 1);
if (MF_DBGLEVEL >= MF_DBG_EXTENDED) {
Dbprintf("[MFEMUL_WORK - ISO14443A_CMD_READBLOCK] Data Block[%d]: %02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x", blockNo,
response[0], response[1], response[2], response[3], response[4], response[5], response[6],
response[7], response[8], response[9], response[10], response[11], response[12], response[13],
response[14], response[15]);
}
// Access permission managment:
//
// Sector Trailer:
// - KEY A access
// - KEY B access
// - AC bits access
//
// Data block:
// - Data access
// If permission is not allowed, data is cleared (00) in emulator memeory.
// ex: a0a1a2a3a4a561e789c1b0b1b2b3b4b5 => 00000000000061e789c1b0b1b2b3b4b5
// Check if selected Block is a Sector Trailer
if (IsSectorTrailer(blockNo)) {
if (!IsAccessAllowed(blockNo, cardAUTHKEY, AC_KEYA_READ)) {
memset(response, 0x00, 6); // keyA can never be read
if (MF_DBGLEVEL >= MF_DBG_EXTENDED) Dbprintf("[MFEMUL_WORK - IsSectorTrailer] keyA can never be read - block %d (0x%02x)", blockNo, blockNo);
}
if (!IsAccessAllowed(blockNo, cardAUTHKEY, AC_KEYB_READ)) {
memset(response + 10, 0x00, 6); // keyB cannot be read
if (MF_DBGLEVEL >= MF_DBG_EXTENDED) Dbprintf("[MFEMUL_WORK - IsSectorTrailer] keyB cannot be read - block %d (0x%02x)", blockNo, blockNo);
}
if (!IsAccessAllowed(blockNo, cardAUTHKEY, AC_AC_READ)) {
memset(response + 6, 0x00, 4); // AC bits cannot be read
if (MF_DBGLEVEL >= MF_DBG_EXTENDED) Dbprintf("[MFEMUL_WORK - IsAccessAllowed] AC bits cannot be read - block %d (0x%02x)", blockNo, blockNo);
}
} else {
if (!IsAccessAllowed(blockNo, cardAUTHKEY, AC_DATA_READ)) {
memset(response, 0x00, 16); // datablock cannot be read
if (MF_DBGLEVEL >= MF_DBG_EXTENDED) Dbprintf("[MFEMUL_WORK - IsAccessAllowed] Data block %d (0x%02x) cannot be read", blockNo, blockNo);
}
}
AddCrc14A(response, 16);
mf_crypto1_encrypt(pcs, response, MAX_MIFARE_FRAME_SIZE, response_par);
EmSendCmdPar(response, MAX_MIFARE_FRAME_SIZE, response_par);
if (MF_DBGLEVEL >= MF_DBG_EXTENDED) {
Dbprintf("[MFEMUL_WORK - EmSendCmdPar] Data Block[%d]: %02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x", blockNo,
response[0], response[1], response[2], response[3], response[4], response[5], response[6],
response[7], response[8], response[9], response[10], response[11], response[12], response[13],
response[14], response[15]);
}
numReads++;
if (exitAfterNReads > 0 && numReads == exitAfterNReads) {
Dbprintf("[MFEMUL_WORK] %d reads done, exiting", numReads);
finished = true;
}
break;
} // End receivedCmd_dec[0] == ISO14443A_CMD_READBLOCK
// case MFEMUL_WORK => CMD WRITEBLOCK
if (receivedCmd_len == 4 && receivedCmd_dec[0] == ISO14443A_CMD_WRITEBLOCK) {
blockNo = receivedCmd_dec[1];
if (MF_DBGLEVEL >= MF_DBG_EXTENDED) Dbprintf("[MFEMUL_WORK] RECV 0xA0 write block %d (%02x)", blockNo, blockNo);
EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_ACK));
cardWRBL = blockNo;
cardSTATE = MFEMUL_WRITEBL2;
if (MF_DBGLEVEL >= MF_DBG_EXTENDED) Dbprintf("[MFEMUL_WORK] cardSTATE = MFEMUL_WRITEBL2");
break;
}
// case MFEMUL_WORK => CMD INC/DEC/REST
if (receivedCmd_len == 4 && (receivedCmd_dec[0] == MIFARE_CMD_INC || receivedCmd_dec[0] == MIFARE_CMD_DEC || receivedCmd_dec[0] == MIFARE_CMD_RESTORE)) {
blockNo = receivedCmd_dec[1];
if (MF_DBGLEVEL >= MF_DBG_EXTENDED) Dbprintf("[MFEMUL_WORK] RECV 0x%02x inc(0xC1)/dec(0xC0)/restore(0xC2) block %d (%02x)", receivedCmd_dec[0], blockNo, blockNo);
if (emlCheckValBl(blockNo)) {
if (MF_DBGLEVEL >= MF_DBG_ERROR) Dbprintf("[MFEMUL_WORK] Reader tried to operate on block, but emlCheckValBl failed, nacking");
EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA));
break;
}
EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_ACK));
cardWRBL = blockNo;
// INC
if (receivedCmd_dec[0] == MIFARE_CMD_INC) {
cardSTATE = MFEMUL_INTREG_INC;
if (MF_DBGLEVEL >= MF_DBG_EXTENDED) Dbprintf("[MFEMUL_WORK] cardSTATE = MFEMUL_INTREG_INC");
}
// DEC
if (receivedCmd_dec[0] == MIFARE_CMD_DEC) {
cardSTATE = MFEMUL_INTREG_DEC;
if (MF_DBGLEVEL >= MF_DBG_EXTENDED) Dbprintf("[MFEMUL_WORK] cardSTATE = MFEMUL_INTREG_DEC");
}
// REST
if (receivedCmd_dec[0] == MIFARE_CMD_RESTORE) {
cardSTATE = MFEMUL_INTREG_REST;
if (MF_DBGLEVEL >= MF_DBG_EXTENDED) Dbprintf("[MFEMUL_WORK] cardSTATE = MFEMUL_INTREG_REST");
}
break;
} // End case MFEMUL_WORK => CMD INC/DEC/REST
// case MFEMUL_WORK => CMD TRANSFER
if (receivedCmd_len == 4 && receivedCmd_dec[0] == MIFARE_CMD_TRANSFER) {
blockNo = receivedCmd_dec[1];
if (MF_DBGLEVEL >= MF_DBG_EXTENDED) Dbprintf("[MFEMUL_WORK] RECV 0x%02x transfer block %d (%02x)", receivedCmd_dec[0], blockNo, blockNo);
if (emlSetValBl(cardINTREG, cardINTBLOCK, receivedCmd_dec[1]))
EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA));
else
EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_ACK));
break;
}
// case MFEMUL_WORK => CMD HALT
if (receivedCmd_len > 1 && receivedCmd_dec[0] == ISO14443A_CMD_HALT && receivedCmd_dec[1] == 0x00) {
LogTrace(uart->output, uart->len, uart->startTime * 16 - DELAY_AIR2ARM_AS_TAG, uart->endTime * 16 - DELAY_AIR2ARM_AS_TAG, uart->parity, true);
LED_B_OFF();
LED_C_OFF();
cardSTATE = MFEMUL_HALTED;
cardAUTHKEY = AUTHKEYNONE;
if (MF_DBGLEVEL >= MF_DBG_EXTENDED) Dbprintf("[MFEMUL_WORK] cardSTATE = MFEMUL_HALTED");
break;
}
// case MFEMUL_WORK => CMD RATS
if (receivedCmd_len == 4 && receivedCmd_dec[0] == ISO14443A_CMD_RATS && receivedCmd_dec[1] == 0x80) {
if (rats && rats_len) {
if (encrypted_data) {
memcpy(response, rats, rats_len);
mf_crypto1_encrypt(pcs, response, rats_len, response_par);
EmSendCmdPar(response, rats_len, response_par);
} else
EmSendCmd(rats, rats_len);
if (MF_DBGLEVEL >= MF_DBG_EXTENDED) Dbprintf("[MFEMUL_WORK] RCV RATS => ACK");
} else {
EmSend4bit(encrypted_data ? mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA) : CARD_NACK_NA);
if (MF_DBGLEVEL >= MF_DBG_EXTENDED) Dbprintf("[MFEMUL_WORK] RCV RATS => NACK");
}
break;
}
// case MFEMUL_WORK => ISO14443A_CMD_NXP_DESELECT
if (receivedCmd_len == 3 && receivedCmd_dec[0] == ISO14443A_CMD_NXP_DESELECT) {
if (rats && rats_len) {
// response back NXP_DESELECT
if (encrypted_data) {
memcpy(response, receivedCmd_dec, receivedCmd_len);
mf_crypto1_encrypt(pcs, response, receivedCmd_len, response_par);
EmSendCmdPar(response, receivedCmd_len, response_par);
} else
EmSendCmd(receivedCmd_dec, receivedCmd_len);
if (MF_DBGLEVEL >= MF_DBG_EXTENDED) Dbprintf("[MFEMUL_WORK] RCV NXP DESELECT => ACK");
} else {
EmSend4bit(encrypted_data ? mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA) : CARD_NACK_NA);
if (MF_DBGLEVEL >= MF_DBG_EXTENDED) Dbprintf("[MFEMUL_WORK] RCV NXP DESELECT => NACK");
}
break;
}
// case MFEMUL_WORK => command not allowed
if (MF_DBGLEVEL >= MF_DBG_EXTENDED) Dbprintf("Received command not allowed, nacking");
EmSend4bit(encrypted_data ? mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA) : CARD_NACK_NA);
break;
}
// AUTH1
case MFEMUL_AUTH1: {
if (MF_DBGLEVEL >= MF_DBG_EXTENDED) Dbprintf("[MFEMUL_AUTH1] Enter case");
if (receivedCmd_len != 8) {
cardSTATE_TO_IDLE();
LogTrace(uart->output, uart->len, uart->startTime * 16 - DELAY_AIR2ARM_AS_TAG, uart->endTime * 16 - DELAY_AIR2ARM_AS_TAG, uart->parity, true);
if (MF_DBGLEVEL >= MF_DBG_EXTENDED) Dbprintf("MFEMUL_AUTH1: receivedCmd_len != 8 (%d) => cardSTATE_TO_IDLE())", receivedCmd_len);
break;
}
nr = bytes_to_num(receivedCmd, 4);
ar = bytes_to_num(&receivedCmd[4], 4);
// Collect AR/NR per keytype & sector
if ((flags & FLAG_NR_AR_ATTACK) == FLAG_NR_AR_ATTACK) {
if (MF_DBGLEVEL >= 0) Dbprintf("FLAG_NR_AR_ATTACK");
for (uint8_t i = 0; i < ATTACK_KEY_COUNT; i++) {
if (ar_nr_collected[i + mM] == 0 || ((cardAUTHSC == ar_nr_resp[i + mM].sector) && (cardAUTHKEY == ar_nr_resp[i + mM].keytype) && (ar_nr_collected[i + mM] > 0))) {
// if first auth for sector, or matches sector and keytype of previous auth
if (ar_nr_collected[i + mM] < 2) {
// if we haven't already collected 2 nonces for this sector
if (ar_nr_resp[ar_nr_collected[i + mM]].ar != ar) {
// Avoid duplicates... probably not necessary, ar should vary.
if (ar_nr_collected[i + mM] == 0) {
// first nonce collect
ar_nr_resp[i + mM].cuid = cuid;
ar_nr_resp[i + mM].sector = cardAUTHSC;
ar_nr_resp[i + mM].keytype = cardAUTHKEY;
ar_nr_resp[i + mM].nonce = nonce;
ar_nr_resp[i + mM].nr = nr;
ar_nr_resp[i + mM].ar = ar;
nonce1_count++;
// add this nonce to first moebius nonce
ar_nr_resp[i + ATTACK_KEY_COUNT].cuid = cuid;
ar_nr_resp[i + ATTACK_KEY_COUNT].sector = cardAUTHSC;
ar_nr_resp[i + ATTACK_KEY_COUNT].keytype = cardAUTHKEY;
ar_nr_resp[i + ATTACK_KEY_COUNT].nonce = nonce;
ar_nr_resp[i + ATTACK_KEY_COUNT].nr = nr;
ar_nr_resp[i + ATTACK_KEY_COUNT].ar = ar;
ar_nr_collected[i + ATTACK_KEY_COUNT]++;
} else { // second nonce collect (std and moebius)
ar_nr_resp[i + mM].nonce2 = nonce;
ar_nr_resp[i + mM].nr2 = nr;
ar_nr_resp[i + mM].ar2 = ar;
if (!gettingMoebius) {
nonce2_count++;
// check if this was the last second nonce we need for std attack
if (nonce2_count == nonce1_count) {
// done collecting std test switch to moebius
// first finish incrementing last sample
ar_nr_collected[i + mM]++;
// switch to moebius collection
gettingMoebius = true;
mM = ATTACK_KEY_COUNT;
nonce = nonce * 7;
break;
}
} else {
moebius_n_count++;
// if we've collected all the nonces we need - finish.
if (nonce1_count == moebius_n_count) finished = true;
}
}
ar_nr_collected[i + mM]++;
}
}
// we found right spot for this nonce stop looking
break;
}
}
}
// --- crypto
crypto1_word(pcs, nr, 1);
cardRr = ar ^ crypto1_word(pcs, 0, 0);
// test if auth KO
if (cardRr != prng_successor(nonce, 64)) {
if (MF_DBGLEVEL >= MF_DBG_EXTENDED) {
Dbprintf("[MFEMUL_AUTH1] AUTH FAILED for sector %d with key %c. [nr=%08x cardRr=%08x] [nt=%08x succ=%08x]"
, cardAUTHSC
, (cardAUTHKEY == 0) ? 'A' : 'B'
, nr
, cardRr
, nonce // nt
, prng_successor(nonce, 64)
);
}
cardAUTHKEY = AUTHKEYNONE; // not authenticated
EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA));
cardSTATE_TO_IDLE();
break;
}
ans = prng_successor(nonce, 96);
num_to_bytes(ans, 4, rAUTH_AT);
mf_crypto1_encrypt(pcs, rAUTH_AT, 4, response_par);
EmSendCmdPar(rAUTH_AT, 4, response_par);
if (MF_DBGLEVEL >= MF_DBG_EXTENDED) {
Dbprintf("[MFEMUL_AUTH1] AUTH COMPLETED for sector %d with key %c. time=%d",
cardAUTHSC,
cardAUTHKEY == 0 ? 'A' : 'B',
GetTickCount() - authTimer
);
}
LED_C_ON();
cardSTATE = MFEMUL_WORK;
if (MF_DBGLEVEL >= MF_DBG_EXTENDED) Dbprintf("[MFEMUL_AUTH1] cardSTATE = MFEMUL_WORK");
break;
}
// WRITE BL2
case MFEMUL_WRITEBL2: {
if (receivedCmd_len == MAX_MIFARE_FRAME_SIZE) {
mf_crypto1_decryptEx(pcs, receivedCmd, receivedCmd_len, receivedCmd_dec);
if (CheckCrc14A(receivedCmd_dec, receivedCmd_len)) {
if (IsSectorTrailer(cardWRBL)) {
emlGetMem(response, cardWRBL, 1);
if (!IsAccessAllowed(cardWRBL, cardAUTHKEY, AC_KEYA_WRITE)) {
memcpy(receivedCmd_dec, response, 6); // don't change KeyA
}
if (!IsAccessAllowed(cardWRBL, cardAUTHKEY, AC_KEYB_WRITE)) {
memcpy(receivedCmd_dec + 10, response + 10, 6); // don't change KeyA
}
if (!IsAccessAllowed(cardWRBL, cardAUTHKEY, AC_AC_WRITE)) {
memcpy(receivedCmd_dec + 6, response + 6, 4); // don't change AC bits
}
} else {
if (!IsAccessAllowed(cardWRBL, cardAUTHKEY, AC_DATA_WRITE)) {
memcpy(receivedCmd_dec, response, 16); // don't change anything
}
}
emlSetMem(receivedCmd_dec, cardWRBL, 1);
EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_ACK)); // always ACK?
cardSTATE = MFEMUL_WORK;
if (MF_DBGLEVEL >= MF_DBG_EXTENDED) Dbprintf("[MFEMUL_WRITEBL2] cardSTATE = MFEMUL_WORK");
break;
}
}
cardSTATE_TO_IDLE();
if (MF_DBGLEVEL >= MF_DBG_EXTENDED) Dbprintf("[MFEMUL_WRITEBL2] cardSTATE = MFEMUL_IDLE");
LogTrace(uart->output, uart->len, uart->startTime * 16 - DELAY_AIR2ARM_AS_TAG, uart->endTime * 16 - DELAY_AIR2ARM_AS_TAG, uart->parity, true);
break;
}
// INC
case MFEMUL_INTREG_INC: {
if (receivedCmd_len == 6) {
mf_crypto1_decryptEx(pcs, receivedCmd, receivedCmd_len, (uint8_t *)&ans);
if (emlGetValBl(&cardINTREG, &cardINTBLOCK, cardWRBL)) {
EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA));
cardSTATE_TO_IDLE();
break;
}
LogTrace(uart->output, uart->len, uart->startTime * 16 - DELAY_AIR2ARM_AS_TAG, uart->endTime * 16 - DELAY_AIR2ARM_AS_TAG, uart->parity, true);
cardINTREG = cardINTREG + ans;
cardSTATE = MFEMUL_WORK;
if (MF_DBGLEVEL >= MF_DBG_EXTENDED) Dbprintf("[MFEMUL_INTREG_INC] cardSTATE = MFEMUL_WORK");
break;
}
}
// DEC
case MFEMUL_INTREG_DEC: {
if (receivedCmd_len == 6) { // Data is encrypted
// Decrypted cmd
mf_crypto1_decryptEx(pcs, receivedCmd, receivedCmd_len, (uint8_t *)&ans);
if (emlGetValBl(&cardINTREG, &cardINTBLOCK, cardWRBL)) {
EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA));
cardSTATE_TO_IDLE();
break;
}
}
LogTrace(uart->output, uart->len, uart->startTime * 16 - DELAY_AIR2ARM_AS_TAG, uart->endTime * 16 - DELAY_AIR2ARM_AS_TAG, uart->parity, true);
cardINTREG = cardINTREG - ans;
cardSTATE = MFEMUL_WORK;
if (MF_DBGLEVEL >= MF_DBG_EXTENDED) Dbprintf("[MFEMUL_INTREG_DEC] cardSTATE = MFEMUL_WORK");
break;
}
// REST
case MFEMUL_INTREG_REST: {
mf_crypto1_decryptEx(pcs, receivedCmd, receivedCmd_len, (uint8_t *)&ans);
if (emlGetValBl(&cardINTREG, &cardINTBLOCK, cardWRBL)) {
EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA));
cardSTATE_TO_IDLE();
break;
}
LogTrace(uart->output, uart->len, uart->startTime * 16 - DELAY_AIR2ARM_AS_TAG, uart->endTime * 16 - DELAY_AIR2ARM_AS_TAG, uart->parity, true);
cardSTATE = MFEMUL_WORK;
if (MF_DBGLEVEL >= MF_DBG_EXTENDED) Dbprintf("[MFEMUL_INTREG_REST] cardSTATE = MFEMUL_WORK");
break;
}
} // End Switch Loop
button_pushed = BUTTON_PRESS();
} // End While Loop
// NR AR ATTACK
if (((flags & FLAG_NR_AR_ATTACK) == FLAG_NR_AR_ATTACK) && (MF_DBGLEVEL >= 1)) {
for (uint8_t i = 0; i < ATTACK_KEY_COUNT; i++) {
if (ar_nr_collected[i] == 2) {
Dbprintf("Collected two pairs of AR/NR which can be used to extract %s from reader for sector %d:", (i < ATTACK_KEY_COUNT / 2) ? "keyA" : "keyB", ar_nr_resp[i].sector);
Dbprintf("../tools/mfkey/mfkey32 %08x %08x %08x %08x %08x %08x",
ar_nr_resp[i].cuid, //UID
ar_nr_resp[i].nonce, //NT
ar_nr_resp[i].nr, //NR1
ar_nr_resp[i].ar, //AR1
ar_nr_resp[i].nr2, //NR2
ar_nr_resp[i].ar2 //AR2
);
}
}
}
for (uint8_t i = ATTACK_KEY_COUNT; i < ATTACK_KEY_COUNT * 2; i++) {
if (ar_nr_collected[i] == 2) {
Dbprintf("Collected two pairs of AR/NR which can be used to extract %s from reader for sector %d:", (i < ATTACK_KEY_COUNT / 2) ? "keyA" : "keyB", ar_nr_resp[i].sector);
Dbprintf("../tools/mfkey/mfkey32v2 %08x %08x %08x %08x %08x %08x %08x",
ar_nr_resp[i].cuid, //UID
ar_nr_resp[i].nonce, //NT
ar_nr_resp[i].nr, //NR1
ar_nr_resp[i].ar, //AR1
ar_nr_resp[i].nonce2,//NT2
ar_nr_resp[i].nr2, //NR2
ar_nr_resp[i].ar2 //AR2
);
}
}
if (MF_DBGLEVEL >= 1) {
Dbprintf("Emulator stopped. Tracing: %d trace length: %d ", get_tracing(), BigBuf_get_traceLen());
}
if ((flags & FLAG_INTERACTIVE) == FLAG_INTERACTIVE) { // Interactive mode flag, means we need to send ACK
//Send the collected ar_nr in the response
reply_old(CMD_ACK, CMD_SIMULATE_MIFARE_CARD, button_pushed, 0, &ar_nr_resp, sizeof(ar_nr_resp));
}
FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
LEDsoff();
set_tracing(false);
BigBuf_free_keep_EM();
}
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