// triggering so that we start recording at the point that the tag is moved
// near the reader.
//-----------------------------------------------------------------------------
-void RAMFUNC SnoopIso14443a(uint8_t param) {
+void RAMFUNC SniffIso14443a(uint8_t param) {
// param:
// bit 0 - trigger from first card answer
// bit 1 - trigger from first reader 7-bit request
-
LEDsoff();
- // We won't start recording the frames that we acquire until we trigger;
- // a good trigger condition to get started is probably when we see a
- // response from the tag.
- // triggered == FALSE -- to wait first for card
- bool triggered = !(param & 0x03);
+ iso14443a_setup(FPGA_HF_ISO14443A_SNIFFER);
// Allocate memory from BigBuf for some buffers
// free all previous allocations first
BigBuf_free();
-
+
+ // init trace buffer
+ clear_trace();
+ set_tracing(TRUE);
+
// The command (reader -> tag) that we're receiving.
uint8_t *receivedCmd = BigBuf_malloc(MAX_FRAME_SIZE);
uint8_t *receivedCmdPar = BigBuf_malloc(MAX_PARITY_SIZE);
// The DMA buffer, used to stream samples from the FPGA
uint8_t *dmaBuf = BigBuf_malloc(DMA_BUFFER_SIZE);
- // init trace buffer
- clear_trace();
- set_tracing(TRUE);
-
uint8_t *data = dmaBuf;
uint8_t previous_data = 0;
int maxDataLen = 0;
bool TagIsActive = FALSE;
bool ReaderIsActive = FALSE;
- iso14443a_setup(FPGA_HF_ISO14443A_SNIFFER);
-
// Set up the demodulator for tag -> reader responses.
DemodInit(receivedResponse, receivedResponsePar);
// Setup and start DMA.
FpgaSetupSscDma((uint8_t *)dmaBuf, DMA_BUFFER_SIZE);
+ // We won't start recording the frames that we acquire until we trigger;
+ // a good trigger condition to get started is probably when we see a
+ // response from the tag.
+ // triggered == FALSE -- to wait first for card
+ bool triggered = !(param & 0x03);
+
// And now we loop, receiving samples.
for(uint32_t rsamples = 0; TRUE; ) {
}
} // main cycle
- DbpString("COMMAND FINISHED");
-
FpgaDisableSscDma();
+ LEDsoff();
+
Dbprintf("maxDataLen=%d, Uart.state=%x, Uart.len=%d", maxDataLen, Uart.state, Uart.len);
Dbprintf("traceLen=%d, Uart.output[0]=%08x", BigBuf_get_traceLen(), (uint32_t)Uart.output[0]);
- LEDsoff();
+
+ set_tracing(FALSE);
}
//-----------------------------------------------------------------------------
// Coded responses need one byte per bit to transfer (data, parity, start, stop, correction)
// 28 * 8 data bits, 28 * 1 parity bits, 7 start bits, 7 stop bits, 7 correction bits
// -> need 273 bytes buffer
-#define ALLOCATED_TAG_MODULATION_BUFFER_SIZE 273
+// 44 * 8 data bits, 44 * 1 parity bits, 9 start bits, 9 stop bits, 9 correction bits --370
+// 47 * 8 data bits, 47 * 1 parity bits, 10 start bits, 10 stop bits, 10 correction bits
+#define ALLOCATED_TAG_MODULATION_BUFFER_SIZE 453
bool prepare_allocated_tag_modulation(tag_response_info_t* response_info) {
// Retrieve and store the current buffer index
// Main loop of simulated tag: receive commands from reader, decide what
// response to send, and send it.
//-----------------------------------------------------------------------------
-void SimulateIso14443aTag(int tagType, int uid_1st, int uid_2nd, byte_t* data)
+void SimulateIso14443aTag(int tagType, int flags, byte_t* data)
{
- uint8_t sak;
+ //Here, we collect UID,NT,AR,NR,UID2,NT2,AR2,NR2
+ // This can be used in a reader-only attack.
+ // (it can also be retrieved via 'hf 14a list', but hey...
+ uint32_t ar_nr_responses[] = {0,0,0,0,0,0,0,0,0,0};
+ uint8_t ar_nr_collected = 0;
+
+ uint8_t sak;
+
+ // PACK response to PWD AUTH for EV1/NTAG
+ uint8_t response8[4] = {0,0,0,0};
+
// The first response contains the ATQA (note: bytes are transmitted in reverse order).
- uint8_t response1[2];
+ uint8_t response1[2] = {0,0};
switch (tagType) {
case 1: { // MIFARE Classic
} break;
case 2: { // MIFARE Ultralight
// Says: I am a stupid memory tag, no crypto
- response1[0] = 0x04;
+ response1[0] = 0x44;
response1[1] = 0x00;
sak = 0x00;
} break;
response1[0] = 0x01;
response1[1] = 0x0f;
sak = 0x01;
+ } break;
+ case 6: { // MIFARE Mini
+ // Says: I am a Mifare Mini, 320b
+ response1[0] = 0x44;
+ response1[1] = 0x00;
+ sak = 0x09;
+ } break;
+ case 7: { // NTAG?
+ // Says: I am a NTAG,
+ response1[0] = 0x44;
+ response1[1] = 0x00;
+ sak = 0x00;
+ // PACK
+ response8[0] = 0x80;
+ response8[1] = 0x80;
+ ComputeCrc14443(CRC_14443_A, response8, 2, &response8[2], &response8[3]);
} break;
default: {
Dbprintf("Error: unkown tagtype (%d)",tagType);
// Check if the uid uses the (optional) part
uint8_t response2a[5] = {0x00};
- if (uid_2nd) {
+ if (flags & FLAG_7B_UID_IN_DATA) {
response2[0] = 0x88;
- num_to_bytes(uid_1st,3,response2+1);
- num_to_bytes(uid_2nd,4,response2a);
+ response2[1] = data[0];
+ response2[2] = data[1];
+ response2[3] = data[2];
+
+ response2a[0] = data[3];
+ response2a[1] = data[4];
+ response2a[2] = data[5];
+ response2a[3] = data[6]; //??
response2a[4] = response2a[0] ^ response2a[1] ^ response2a[2] ^ response2a[3];
// Configure the ATQA and SAK accordingly
response1[0] |= 0x40;
sak |= 0x04;
} else {
- num_to_bytes(uid_1st,4,response2);
+ memcpy(response2, data, 4);
+ //num_to_bytes(uid_1st,4,response2);
// Configure the ATQA and SAK accordingly
response1[0] &= 0xBF;
sak &= 0xFB;
// TC(1) = 0x02: CID supported, NAD not supported
ComputeCrc14443(CRC_14443_A, response6, 4, &response6[4], &response6[5]);
- #define TAG_RESPONSE_COUNT 7
+ // Prepare GET_VERSION (different for EV-1 / NTAG)
+ //uint8_t response7_EV1[] = {0x00, 0x04, 0x03, 0x01, 0x01, 0x00, 0x0b, 0x03, 0xfd, 0xf7}; //EV1 48bytes VERSION.
+ uint8_t response7_NTAG[] = {0x00, 0x04, 0x04, 0x02, 0x01, 0x00, 0x11, 0x03, 0x01, 0x9e}; //NTAG 215
+
+ // Prepare CHK_TEARING
+ uint8_t response9[] = {0xBD,0x90,0x3f};
+
+ #define TAG_RESPONSE_COUNT 10
tag_response_info_t responses[TAG_RESPONSE_COUNT] = {
{ .response = response1, .response_n = sizeof(response1) }, // Answer to request - respond with card type
{ .response = response2, .response_n = sizeof(response2) }, // Anticollision cascade1 - respond with uid
{ .response = response3a, .response_n = sizeof(response3a) }, // Acknowledge select - cascade 2
{ .response = response5, .response_n = sizeof(response5) }, // Authentication answer (random nonce)
{ .response = response6, .response_n = sizeof(response6) }, // dummy ATS (pseudo-ATR), answer to RATS
+ { .response = response7_NTAG, .response_n = sizeof(response7_NTAG) }, // EV1/NTAG GET_VERSION response
+ { .response = response8, .response_n = sizeof(response8) }, // EV1/NTAG PACK response
+ { .response = response9, .response_n = sizeof(response9) } // EV1/NTAG CHK_TEAR response
};
// Allocate 512 bytes for the dynamic modulation, created when the reader queries for it
.modulation_n = 0
};
+ // We need to listen to the high-frequency, peak-detected path.
+ iso14443a_setup(FPGA_HF_ISO14443A_TAGSIM_LISTEN);
+
BigBuf_free_keep_EM();
// allocate buffers:
int happened2 = 0;
int cmdsRecvd = 0;
- // We need to listen to the high-frequency, peak-detected path.
- iso14443a_setup(FPGA_HF_ISO14443A_TAGSIM_LISTEN);
-
cmdsRecvd = 0;
tag_response_info_t* p_response;
} else if(receivedCmd[1] == 0x70 && receivedCmd[0] == 0x95) { // Received a SELECT (cascade 2)
p_response = &responses[4]; order = 30;
} else if(receivedCmd[0] == 0x30) { // Received a (plain) READ
- EmSendCmdEx(data+(4*receivedCmd[1]),16,false);
- // Dbprintf("Read request from reader: %x %x",receivedCmd[0],receivedCmd[1]);
- // We already responded, do not send anything with the EmSendCmd14443aRaw() that is called below
+ uint8_t block = receivedCmd[1];
+ if ( tagType == 7 ) {
+ uint16_t start = 4 * block;
+
+ /*if ( block < 4 ) {
+ //NTAG 215
+ uint8_t blockdata[50] = {
+ data[0],data[1],data[2], 0x88 ^ data[0] ^ data[1] ^ data[2],
+ data[3],data[4],data[5],data[6],
+ data[3] ^ data[4] ^ data[5] ^ data[6],0x48,0x0f,0xe0,
+ 0xe1,0x10,0x12,0x00,
+ 0x03,0x00,0xfe,0x00,
+ 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
+ 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
+ 0x00,0x00,0x00,0x00,
+ 0x00,0x00};
+ AppendCrc14443a(blockdata+start, 16);
+ EmSendCmdEx( blockdata+start, MAX_MIFARE_FRAME_SIZE, false);
+ } else {*/
+ uint8_t emdata[MAX_MIFARE_FRAME_SIZE];
+ emlGetMemBt( emdata, start, 16);
+ AppendCrc14443a(emdata, 16);
+ EmSendCmdEx(emdata, sizeof(emdata), false);
+ //}
+ p_response = NULL;
+
+ } else {
+ EmSendCmdEx(data+(4*block),16,false);
+ // Dbprintf("Read request from reader: %x %x",receivedCmd[0],receivedCmd[1]);
+ // We already responded, do not send anything with the EmSendCmd14443aRaw() that is called below
+ p_response = NULL;
+ }
+ } else if(receivedCmd[0] == 0x3A) { // Received a FAST READ (ranged read) -- just returns all zeros.
+
+ uint8_t emdata[MAX_FRAME_SIZE];
+ int start = receivedCmd[1] * 4;
+ int len = (receivedCmd[2] - receivedCmd[1] + 1) * 4;
+ emlGetMemBt( emdata, start, len);
+ AppendCrc14443a(emdata, len);
+ EmSendCmdEx(emdata, len+2, false);
+ p_response = NULL;
+
+ } else if(receivedCmd[0] == 0x3C && tagType == 7) { // Received a READ SIGNATURE --
+ // ECC data, taken from a NTAG215 amiibo token. might work. LEN: 32, + 2 crc
+ uint8_t data[] = {0x56,0x06,0xa6,0x4f,0x43,0x32,0x53,0x6f,
+ 0x43,0xda,0x45,0xd6,0x61,0x38,0xaa,0x1e,
+ 0xcf,0xd3,0x61,0x36,0xca,0x5f,0xbb,0x05,
+ 0xce,0x21,0x24,0x5b,0xa6,0x7a,0x79,0x07,
+ 0x00,0x00};
+ AppendCrc14443a(data, sizeof(data)-2);
+ EmSendCmdEx(data,sizeof(data),false);
+ p_response = NULL;
+ } else if(receivedCmd[0] == 0x39 && tagType == 7) { // Received a READ COUNTER --
+ uint8_t data[] = {0x00,0x00,0x00,0x14,0xa5};
+ EmSendCmdEx(data,sizeof(data),false);
+ p_response = NULL;
+ } else if(receivedCmd[0] == 0xA5 && tagType == 7) { // Received a INC COUNTER --
+ // number of counter
+ //uint8_t counter = receivedCmd[1];
+ //uint32_t val = bytes_to_num(receivedCmd+2,4);
+
+ // send ACK
+ uint8_t ack[] = {0x0a};
+ EmSendCmdEx(ack,sizeof(ack),false);
p_response = NULL;
+
+ } else if(receivedCmd[0] == 0x3E && tagType == 7) { // Received a CHECK_TEARING_EVENT --
+ p_response = &responses[9];
} else if(receivedCmd[0] == 0x50) { // Received a HALT
if (tracing) {
}
p_response = NULL;
} else if(receivedCmd[0] == 0x60 || receivedCmd[0] == 0x61) { // Received an authentication request
- p_response = &responses[5]; order = 7;
+
+ if ( tagType == 7 ) { // IF NTAG /EV1 0x60 == GET_VERSION, not a authentication request.
+ p_response = &responses[7];
+ } else {
+ p_response = &responses[5]; order = 7;
+ }
} else if(receivedCmd[0] == 0xE0) { // Received a RATS request
if (tagType == 1 || tagType == 2) { // RATS not supported
EmSend4bit(CARD_NACK_NA);
if (tracing) {
LogTrace(receivedCmd, Uart.len, Uart.startTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.endTime*16 - DELAY_AIR2ARM_AS_TAG, Uart.parity, TRUE);
}
+ uint32_t nonce = bytes_to_num(response5,4);
uint32_t nr = bytes_to_num(receivedCmd,4);
uint32_t ar = bytes_to_num(receivedCmd+4,4);
- Dbprintf("Auth attempt {nr}{ar}: %08x %08x",nr,ar);
- } else {
+ //Dbprintf("Auth attempt {nonce}{nr}{ar}: %08x %08x %08x", nonce, nr, ar);
+
+ if(flags & FLAG_NR_AR_ATTACK )
+ {
+ if(ar_nr_collected < 2){
+ // Avoid duplicates... probably not necessary, nr should vary.
+ //if(ar_nr_responses[3] != nr){
+ ar_nr_responses[ar_nr_collected*5] = 0;
+ ar_nr_responses[ar_nr_collected*5+1] = 0;
+ ar_nr_responses[ar_nr_collected*5+2] = nonce;
+ ar_nr_responses[ar_nr_collected*5+3] = nr;
+ ar_nr_responses[ar_nr_collected*5+4] = ar;
+ ar_nr_collected++;
+ //}
+ }
+
+ if(ar_nr_collected > 1 ) {
+
+ if (MF_DBGLEVEL >= 2) {
+ Dbprintf("Collected two pairs of AR/NR which can be used to extract keys from reader:");
+ Dbprintf("../tools/mfkey/mfkey32 %07x%08x %08x %08x %08x %08x %08x",
+ ar_nr_responses[0], // UID1
+ ar_nr_responses[1], // UID2
+ ar_nr_responses[2], // NT
+ ar_nr_responses[3], // AR1
+ ar_nr_responses[4], // NR1
+ ar_nr_responses[8], // AR2
+ ar_nr_responses[9] // NR2
+ );
+ Dbprintf("../tools/mfkey/mfkey32v2 %06x%08x %08x %08x %08x %08x %08x %08x",
+ ar_nr_responses[0], // UID1
+ ar_nr_responses[1], // UID2
+ ar_nr_responses[2], // NT1
+ ar_nr_responses[3], // AR1
+ ar_nr_responses[4], // NR1
+ ar_nr_responses[7], // NT2
+ ar_nr_responses[8], // AR2
+ ar_nr_responses[9] // NR2
+ );
+ }
+ uint8_t len = ar_nr_collected*5*4;
+ cmd_send(CMD_ACK,CMD_SIMULATE_MIFARE_CARD,len,0,&ar_nr_responses,len);
+ ar_nr_collected = 0;
+ memset(ar_nr_responses, 0x00, len);
+ }
+ }
+ } else if (receivedCmd[0] == 0x1a ) // ULC authentication
+ {
+
+ }
+ else if (receivedCmd[0] == 0x1b) // NTAG / EV-1 authentication
+ {
+ if ( tagType == 7 ) {
+ p_response = &responses[8]; // PACK response
+ uint32_t pwd = bytes_to_num(receivedCmd+1,4);
+
+ if ( MF_DBGLEVEL >= 3) Dbprintf("Auth attempt: %08x", pwd);
+ }
+ }
+ else {
// Check for ISO 14443A-4 compliant commands, look at left nibble
switch (receivedCmd[0]) {
-
+ case 0x02:
+ case 0x03: { // IBlock (command no CID)
+ dynamic_response_info.response[0] = receivedCmd[0];
+ dynamic_response_info.response[1] = 0x90;
+ dynamic_response_info.response[2] = 0x00;
+ dynamic_response_info.response_n = 3;
+ } break;
case 0x0B:
- case 0x0A: { // IBlock (command)
+ case 0x0A: { // IBlock (command CID)
dynamic_response_info.response[0] = receivedCmd[0];
dynamic_response_info.response[1] = 0x00;
dynamic_response_info.response[2] = 0x90;
dynamic_response_info.response_n = 2;
} break;
- case 0xBA: { //
- memcpy(dynamic_response_info.response,"\xAB\x00",2);
- dynamic_response_info.response_n = 2;
+ case 0xBA: { // ping / pong
+ dynamic_response_info.response[0] = 0xAB;
+ dynamic_response_info.response[1] = 0x00;
+ dynamic_response_info.response_n = 2;
} break;
case 0xCA:
case 0xC2: { // Readers sends deselect command
- memcpy(dynamic_response_info.response,"\xCA\x00",2);
- dynamic_response_info.response_n = 2;
+ dynamic_response_info.response[0] = 0xCA;
+ dynamic_response_info.response[1] = 0x00;
+ dynamic_response_info.response_n = 2;
} break;
default: {
}
}
- Dbprintf("%x %x %x", happened, happened2, cmdsRecvd);
- LED_A_OFF();
+ FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
+ set_tracing(FALSE);
BigBuf_free_keep_EM();
+ LED_A_OFF();
+
+ if (MF_DBGLEVEL >= 4){
+ Dbprintf("-[ Wake ups after halt [%d]", happened);
+ Dbprintf("-[ Messages after halt [%d]", happened2);
+ Dbprintf("-[ Num of received cmd [%d]", cmdsRecvd);
+ }
}
FpgaSendQueueDelay = (uint8_t)AT91C_BASE_SSC->SSC_RHR;
}
- if(BUTTON_PRESS()) {
- break;
- }
+ if(BUTTON_PRESS()) break;
}
// Ensure that the FPGA Delay Queue is empty before we switch to TAGSIM_LISTEN again:
}
}
-
void ReaderTransmitBitsPar(uint8_t* frame, uint16_t bits, uint8_t *par, uint32_t *timing)
{
CodeIso14443aBitsAsReaderPar(frame, bits, par);
}
}
-
void ReaderTransmitPar(uint8_t* frame, uint16_t len, uint8_t *par, uint32_t *timing)
{
ReaderTransmitBitsPar(frame, len*8, par, timing);
}
-
void ReaderTransmitBits(uint8_t* frame, uint16_t len, uint32_t *timing)
{
// Generate parity and redirect
ReaderTransmitBitsPar(frame, len, par, timing);
}
-
void ReaderTransmit(uint8_t* frame, uint16_t len, uint32_t *timing)
{
// Generate parity and redirect
if(param & ISO14A_TOPAZMODE) {
AppendCrc14443b(cmd,len);
} else {
- AppendCrc14443a(cmd,len);
+ AppendCrc14443a(cmd,len);
}
len += 2;
if (lenbits) lenbits += 16;
}
FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
+ set_tracing(FALSE);
LEDsoff();
}
nttmp1 = nt1;
nttmp2 = nt2;
- for (i = 1; i < 32768; i++) {
+ for (i = 1; i < 0xFFFF; i++) {
nttmp1 = prng_successor(nttmp1, 1);
if (nttmp1 == nt2) return i;
nttmp2 = prng_successor(nttmp2, 1);
uint8_t receivedAnswer[MAX_MIFARE_FRAME_SIZE];
uint8_t receivedAnswerPar[MAX_MIFARE_PARITY_SIZE];
+ if (first_try) {
+ iso14443a_setup(FPGA_HF_ISO14443A_READER_MOD);
+ }
+
// free eventually allocated BigBuf memory. We want all for tracing.
BigBuf_free();
byte_t par_list[8] = {0x00};
byte_t ks_list[8] = {0x00};
- static uint32_t sync_time;
- static uint32_t sync_cycles;
+ #define PRNG_SEQUENCE_LENGTH (1 << 16);
+ static uint32_t sync_time = 0;
+ static int32_t sync_cycles = 0;
int catch_up_cycles = 0;
int last_catch_up = 0;
+ uint16_t elapsed_prng_sequences;
uint16_t consecutive_resyncs = 0;
int isOK = 0;
if (first_try) {
mf_nr_ar3 = 0;
- iso14443a_setup(FPGA_HF_ISO14443A_READER_MOD);
sync_time = GetCountSspClk() & 0xfffffff8;
- sync_cycles = 65536; // theory: Mifare Classic's random generator repeats every 2^16 cycles (and so do the nonces).
+ sync_cycles = PRNG_SEQUENCE_LENGTH; //65536; //0x10000 // theory: Mifare Classic's random generator repeats every 2^16 cycles (and so do the nonces).
nt_attacked = 0;
- nt = 0;
par[0] = 0;
}
else {
LED_B_OFF();
LED_C_OFF();
+
+ #define MAX_UNEXPECTED_RANDOM 4 // maximum number of unexpected (i.e. real) random numbers when trying to sync. Then give up.
+ #define MAX_SYNC_TRIES 32
+ #define NUM_DEBUG_INFOS 8 // per strategy
+ #define MAX_STRATEGY 3
+ uint16_t unexpected_random = 0;
+ uint16_t sync_tries = 0;
+ int16_t debug_info_nr = -1;
+ uint16_t strategy = 0;
+ int32_t debug_info[MAX_STRATEGY][NUM_DEBUG_INFOS];
+ uint32_t select_time;
+ uint32_t halt_time;
for(uint16_t i = 0; TRUE; i++) {
+ LED_C_ON();
WDT_HIT();
// Test if the action was cancelled
if(BUTTON_PRESS()) {
+ isOK = -1;
break;
}
- LED_C_ON();
+ if (strategy == 2) {
+ // test with additional hlt command
+ halt_time = 0;
+ int len = mifare_sendcmd_short(NULL, false, 0x50, 0x00, receivedAnswer, receivedAnswerPar, &halt_time);
+ if (len && MF_DBGLEVEL >= 3) {
+ Dbprintf("Unexpected response of %d bytes to hlt command (additional debugging).", len);
+ }
+ }
+ if (strategy == 3) {
+ // test with FPGA power off/on
+ FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
+ SpinDelay(200);
+ iso14443a_setup(FPGA_HF_ISO14443A_READER_MOD);
+ SpinDelay(100);
+ }
+
if(!iso14443a_select_card(uid, NULL, &cuid)) {
if (MF_DBGLEVEL >= 1) Dbprintf("Mifare: Can't select card");
continue;
}
+ select_time = GetCountSspClk();
- sync_time = (sync_time & 0xfffffff8) + sync_cycles + catch_up_cycles;
- catch_up_cycles = 0;
+ elapsed_prng_sequences = 1;
+ if (debug_info_nr == -1) {
+ sync_time = (sync_time & 0xfffffff8) + sync_cycles + catch_up_cycles;
+ catch_up_cycles = 0;
- // if we missed the sync time already, advance to the next nonce repeat
- while(GetCountSspClk() > sync_time) {
- sync_time = (sync_time & 0xfffffff8) + sync_cycles;
- }
+ // if we missed the sync time already, advance to the next nonce repeat
+ while(GetCountSspClk() > sync_time) {
+ elapsed_prng_sequences++;
+ sync_time = (sync_time & 0xfffffff8) + sync_cycles;
+ }
- // Transmit MIFARE_CLASSIC_AUTH at synctime. Should result in returning the same tag nonce (== nt_attacked)
- ReaderTransmit(mf_auth, sizeof(mf_auth), &sync_time);
+ // Transmit MIFARE_CLASSIC_AUTH at synctime. Should result in returning the same tag nonce (== nt_attacked)
+ ReaderTransmit(mf_auth, sizeof(mf_auth), &sync_time);
+ } else {
+ // collect some information on tag nonces for debugging:
+ #define DEBUG_FIXED_SYNC_CYCLES PRNG_SEQUENCE_LENGTH
+ if (strategy == 0) {
+ // nonce distances at fixed time after card select:
+ sync_time = select_time + DEBUG_FIXED_SYNC_CYCLES;
+ } else if (strategy == 1) {
+ // nonce distances at fixed time between authentications:
+ sync_time = sync_time + DEBUG_FIXED_SYNC_CYCLES;
+ } else if (strategy == 2) {
+ // nonce distances at fixed time after halt:
+ sync_time = halt_time + DEBUG_FIXED_SYNC_CYCLES;
+ } else {
+ // nonce_distances at fixed time after power on
+ sync_time = DEBUG_FIXED_SYNC_CYCLES;
+ }
+ ReaderTransmit(mf_auth, sizeof(mf_auth), &sync_time);
+ }
// Receive the (4 Byte) "random" nonce
if (!ReaderReceive(receivedAnswer, receivedAnswerPar)) {
int nt_distance = dist_nt(previous_nt, nt);
if (nt_distance == 0) {
nt_attacked = nt;
- }
- else {
- if (nt_distance == -99999) { // invalid nonce received, try again
- continue;
+ } else {
+ if (nt_distance == -99999) { // invalid nonce received
+ unexpected_random++;
+ if (unexpected_random > MAX_UNEXPECTED_RANDOM) {
+ isOK = -3; // Card has an unpredictable PRNG. Give up
+ break;
+ } else {
+ continue; // continue trying...
+ }
+ }
+ if (++sync_tries > MAX_SYNC_TRIES) {
+ if (strategy > MAX_STRATEGY || MF_DBGLEVEL < 3) {
+ isOK = -4; // Card's PRNG runs at an unexpected frequency or resets unexpectedly
+ break;
+ } else { // continue for a while, just to collect some debug info
+ debug_info[strategy][debug_info_nr] = nt_distance;
+ debug_info_nr++;
+ if (debug_info_nr == NUM_DEBUG_INFOS) {
+ strategy++;
+ debug_info_nr = 0;
+ }
+ continue;
+ }
+ }
+ sync_cycles = (sync_cycles - nt_distance/elapsed_prng_sequences);
+ if (sync_cycles <= 0) {
+ sync_cycles += PRNG_SEQUENCE_LENGTH;
+ }
+ if (MF_DBGLEVEL >= 3) {
+ Dbprintf("calibrating in cycle %d. nt_distance=%d, elapsed_prng_sequences=%d, new sync_cycles: %d\n", i, nt_distance, elapsed_prng_sequences, sync_cycles);
}
- sync_cycles = (sync_cycles - nt_distance);
- if (MF_DBGLEVEL >= 3) Dbprintf("calibrating in cycle %d. nt_distance=%d, Sync_cycles: %d\n", i, nt_distance, sync_cycles);
continue;
}
}
catch_up_cycles = 0;
continue;
}
+ catch_up_cycles /= elapsed_prng_sequences;
if (catch_up_cycles == last_catch_up) {
consecutive_resyncs++;
}
else {
sync_cycles = sync_cycles + catch_up_cycles;
if (MF_DBGLEVEL >= 3) Dbprintf("Lost sync in cycle %d for the fourth time consecutively (nt_distance = %d). Adjusting sync_cycles to %d.\n", i, -catch_up_cycles, sync_cycles);
+ last_catch_up = 0;
+ catch_up_cycles = 0;
+ consecutive_resyncs = 0;
}
continue;
}
consecutive_resyncs = 0;
// Receive answer. This will be a 4 Bit NACK when the 8 parity bits are OK after decoding
- if (ReaderReceive(receivedAnswer, receivedAnswerPar))
- {
+ if (ReaderReceive(receivedAnswer, receivedAnswerPar)) {
catch_up_cycles = 8; // the PRNG is delayed by 8 cycles due to the NAC (4Bits = 0x05 encrypted) transfer
- if (nt_diff == 0)
- {
+ if (nt_diff == 0) {
par_low = par[0] & 0xE0; // there is no need to check all parities for other nt_diff. Parity Bits for mf_nr_ar[0..2] won't change
}
if (nt_diff == 0 && first_try)
{
par[0]++;
+ if (par[0] == 0x00) { // tried all 256 possible parities without success. Card doesn't send NACK.
+ isOK = -2;
+ break;
+ }
} else {
par[0] = ((par[0] & 0x1F) + 1) | par_low;
}
mf_nr_ar[3] &= 0x1F;
+ if (isOK == -4) {
+ if (MF_DBGLEVEL >= 3) {
+ for (uint16_t i = 0; i <= MAX_STRATEGY; i++) {
+ for(uint16_t j = 0; j < NUM_DEBUG_INFOS; j++) {
+ Dbprintf("collected debug info[%d][%d] = %d", i, j, debug_info[i][j]);
+ }
+ }
+ }
+ }
+
byte_t buf[28];
memcpy(buf + 0, uid, 4);
num_to_bytes(nt, 4, buf + 4);
uint8_t cardWRBL = 0;
uint8_t cardAUTHSC = 0;
uint8_t cardAUTHKEY = 0xff; // no authentication
- uint32_t cardRr = 0;
+// uint32_t cardRr = 0;
uint32_t cuid = 0;
//uint32_t rn_enc = 0;
uint32_t ans = 0;
uint8_t rATQA[] = {0x04, 0x00}; // Mifare classic 1k 4BUID
uint8_t rUIDBCC1[] = {0xde, 0xad, 0xbe, 0xaf, 0x62};
uint8_t rUIDBCC2[] = {0xde, 0xad, 0xbe, 0xaf, 0x62}; // !!!
- uint8_t rSAK[] = {0x08, 0xb6, 0xdd};
+ //uint8_t rSAK[] = {0x08, 0xb6, 0xdd}; // Mifare Classic
+ uint8_t rSAK[] = {0x09, 0x3f, 0xcc }; // Mifare Mini
uint8_t rSAK1[] = {0x04, 0xda, 0x17};
- uint8_t rAUTH_NT[] = {0x01, 0x02, 0x03, 0x04};
+ uint8_t rAUTH_NT[] = {0x01, 0x01, 0x01, 0x01};
uint8_t rAUTH_AT[] = {0x00, 0x00, 0x00, 0x00};
//Here, we collect UID,NT,AR,NR,UID2,NT2,AR2,NR2
// This can be used in a reader-only attack.
// (it can also be retrieved via 'hf 14a list', but hey...
- uint32_t ar_nr_responses[] = {0,0,0,0,0,0,0,0};
+ uint32_t ar_nr_responses[] = {0,0,0,0,0,0,0,0,0,0};
uint8_t ar_nr_collected = 0;
- // free eventually allocated BigBuf memory but keep Emulator Memory
- BigBuf_free_keep_EM();
-
- // clear trace
- clear_trace();
- set_tracing(TRUE);
-
// Authenticate response - nonce
uint32_t nonce = bytes_to_num(rAUTH_NT, 4);
}
}
+ // save uid.
+ ar_nr_responses[0*5] = bytes_to_num(rUIDBCC1+1, 3);
+ if ( _7BUID )
+ ar_nr_responses[0*5+1] = bytes_to_num(rUIDBCC2, 4);
+
/*
* Regardless of what method was used to set the UID, set fifth byte and modify
* the ATQA for 4 or 7-byte UID
if (_7BUID) {
rATQA[0] = 0x44;
rUIDBCC1[0] = 0x88;
+ rUIDBCC1[4] = rUIDBCC1[0] ^ rUIDBCC1[1] ^ rUIDBCC1[2] ^ rUIDBCC1[3];
rUIDBCC2[4] = rUIDBCC2[0] ^ rUIDBCC2[1] ^ rUIDBCC2[2] ^ rUIDBCC2[3];
}
- // We need to listen to the high-frequency, peak-detected path.
- iso14443a_setup(FPGA_HF_ISO14443A_TAGSIM_LISTEN);
-
-
if (MF_DBGLEVEL >= 1) {
if (!_7BUID) {
Dbprintf("4B UID: %02x%02x%02x%02x",
}
}
+ // We need to listen to the high-frequency, peak-detected path.
+ iso14443a_setup(FPGA_HF_ISO14443A_TAGSIM_LISTEN);
+
+ // free eventually allocated BigBuf memory but keep Emulator Memory
+ BigBuf_free_keep_EM();
+
+ // clear trace
+ clear_trace();
+ set_tracing(TRUE);
+
+
bool finished = FALSE;
while (!BUTTON_PRESS() && !finished) {
WDT_HIT();
if(cardSTATE == MFEMUL_NOFIELD) continue;
//Now, get data
-
res = EmGetCmd(receivedCmd, &len, receivedCmd_par);
if (res == 2) { //Field is off!
cardSTATE = MFEMUL_NOFIELD;
uint32_t nr = bytes_to_num(&receivedCmd[4], 4);
//Collect AR/NR
- if(ar_nr_collected < 2 && cardAUTHSC == 2){
+ //if(ar_nr_collected < 2 && cardAUTHSC == 2){
+ if(ar_nr_collected < 2){
if(ar_nr_responses[2] != ar)
{// Avoid duplicates... probably not necessary, ar should vary.
- ar_nr_responses[ar_nr_collected*4] = cuid;
- ar_nr_responses[ar_nr_collected*4+1] = nonce;
- ar_nr_responses[ar_nr_collected*4+2] = ar;
- ar_nr_responses[ar_nr_collected*4+3] = nr;
+ //ar_nr_responses[ar_nr_collected*5] = 0;
+ //ar_nr_responses[ar_nr_collected*5+1] = 0;
+ ar_nr_responses[ar_nr_collected*5+2] = nonce;
+ ar_nr_responses[ar_nr_collected*5+3] = nr;
+ ar_nr_responses[ar_nr_collected*5+4] = ar;
ar_nr_collected++;
}
// Interactive mode flag, means we need to send ACK
}
// --- crypto
- crypto1_word(pcs, ar , 1);
- cardRr = nr ^ crypto1_word(pcs, 0, 0);
-
- // test if auth OK
- if (cardRr != prng_successor(nonce, 64)){
- if (MF_DBGLEVEL >= 2) Dbprintf("AUTH FAILED for sector %d with key %c. cardRr=%08x, succ=%08x",
- cardAUTHSC, cardAUTHKEY == 0 ? 'A' : 'B',
- cardRr, prng_successor(nonce, 64));
+ //crypto1_word(pcs, ar , 1);
+ //cardRr = nr ^ crypto1_word(pcs, 0, 0);
+
+ //test if auth OK
+ //if (cardRr != prng_successor(nonce, 64)){
+
+ //if (MF_DBGLEVEL >= 4) Dbprintf("AUTH FAILED for sector %d with key %c. cardRr=%08x, succ=%08x",
+ // cardAUTHSC, cardAUTHKEY == 0 ? 'A' : 'B',
+ // cardRr, prng_successor(nonce, 64));
// Shouldn't we respond anything here?
// Right now, we don't nack or anything, which causes the
// reader to do a WUPA after a while. /Martin
// -- which is the correct response. /piwi
- 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);
- break;
- }
+ //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);
+ //break;
+ //}
ans = prng_successor(nonce, 96) ^ crypto1_word(pcs, 0, 0);
|| receivedCmd[0] == 0xB0) { // transfer
if (receivedCmd[1] >= 16 * 4) {
EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA));
- if (MF_DBGLEVEL >= 2) Dbprintf("Reader tried to operate (0x%02) on out of range block: %d (0x%02x), nacking",receivedCmd[0],receivedCmd[1],receivedCmd[1]);
+ if (MF_DBGLEVEL >= 4) Dbprintf("Reader tried to operate (0x%02) on out of range block: %d (0x%02x), nacking",receivedCmd[0],receivedCmd[1],receivedCmd[1]);
break;
}
if (receivedCmd[1] / 4 != cardAUTHSC) {
EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA));
- if (MF_DBGLEVEL >= 2) Dbprintf("Reader tried to operate (0x%02) on block (0x%02x) not authenticated for (0x%02x), nacking",receivedCmd[0],receivedCmd[1],cardAUTHSC);
+ if (MF_DBGLEVEL >= 4) Dbprintf("Reader tried to operate (0x%02) on block (0x%02x) not authenticated for (0x%02x), nacking",receivedCmd[0],receivedCmd[1],cardAUTHSC);
break;
}
}
if (receivedCmd[0] == 0xC0 || receivedCmd[0] == 0xC1 || receivedCmd[0] == 0xC2) {
if (MF_DBGLEVEL >= 4) Dbprintf("RECV 0x%02x inc(0xC1)/dec(0xC0)/restore(0xC2) block %d (%02x)",receivedCmd[0],receivedCmd[1],receivedCmd[1]);
if (emlCheckValBl(receivedCmd[1])) {
- if (MF_DBGLEVEL >= 2) Dbprintf("Reader tried to operate on block, but emlCheckValBl failed, nacking");
+ if (MF_DBGLEVEL >= 4) Dbprintf("Reader tried to operate on block, but emlCheckValBl failed, nacking");
EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA));
break;
}
if(flags & FLAG_INTERACTIVE)// Interactive mode flag, means we need to send ACK
{
//May just aswell send the collected ar_nr in the response aswell
- cmd_send(CMD_ACK,CMD_SIMULATE_MIFARE_CARD,1,0,&ar_nr_responses,ar_nr_collected*4*4);
+ uint8_t len = ar_nr_collected*5*4;
+ cmd_send(CMD_ACK, CMD_SIMULATE_MIFARE_CARD, len, 0, &ar_nr_responses, len);
}
if(flags & FLAG_NR_AR_ATTACK && MF_DBGLEVEL >= 1 )
{
if(ar_nr_collected > 1 ) {
Dbprintf("Collected two pairs of AR/NR which can be used to extract keys from reader:");
- Dbprintf("../tools/mfkey/mfkey32 %08x %08x %08x %08x %08x %08x",
- ar_nr_responses[0], // UID
- ar_nr_responses[1], //NT
- ar_nr_responses[2], //AR1
- ar_nr_responses[3], //NR1
- ar_nr_responses[6], //AR2
- ar_nr_responses[7] //NR2
+ Dbprintf("../tools/mfkey/mfkey32 %06x%08x %08x %08x %08x %08x %08x",
+ ar_nr_responses[0], // UID1
+ ar_nr_responses[1], // UID2
+ ar_nr_responses[2], // NT
+ ar_nr_responses[3], // AR1
+ ar_nr_responses[4], // NR1
+ ar_nr_responses[8], // AR2
+ ar_nr_responses[9] // NR2
+ );
+ Dbprintf("../tools/mfkey/mfkey32v2 %06x%08x %08x %08x %08x %08x %08x %08x",
+ ar_nr_responses[0], // UID1
+ ar_nr_responses[1], // UID2
+ ar_nr_responses[2], // NT1
+ ar_nr_responses[3], // AR1
+ ar_nr_responses[4], // NR1
+ ar_nr_responses[7], // NT2
+ ar_nr_responses[8], // AR2
+ ar_nr_responses[9] // NR2
);
} else {
Dbprintf("Failed to obtain two AR/NR pairs!");
if(ar_nr_collected > 0 ) {
- Dbprintf("Only got these: UID=%08x, nonce=%08x, AR1=%08x, NR1=%08x",
- ar_nr_responses[0], // UID
- ar_nr_responses[1], //NT
- ar_nr_responses[2], //AR1
- ar_nr_responses[3] //NR1
+ Dbprintf("Only got these: UID=%07x%08x, nonce=%08x, AR1=%08x, NR1=%08x",
+ ar_nr_responses[0], // UID1
+ ar_nr_responses[1], // UID2
+ ar_nr_responses[2], // NT
+ ar_nr_responses[3], // AR1
+ ar_nr_responses[4] // NR1
);
}
}
}
- if (MF_DBGLEVEL >= 1) Dbprintf("Emulator stopped. Tracing: %d trace length: %d ", tracing, BigBuf_get_traceLen());
+ if (MF_DBGLEVEL >= 1) Dbprintf("Emulator stopped. Tracing: %d trace length: %d ", tracing, BigBuf_get_traceLen());
+ set_tracing(FALSE);
}
-
//-----------------------------------------------------------------------------
// MIFARE sniffer.
//
uint8_t receivedResponse[MAX_MIFARE_FRAME_SIZE];
uint8_t receivedResponsePar[MAX_MIFARE_PARITY_SIZE];
- // As we receive stuff, we copy it from receivedCmd or receivedResponse
- // into trace, along with its length and other annotations.
- //uint8_t *trace = (uint8_t *)BigBuf;
-
+ iso14443a_setup(FPGA_HF_ISO14443A_SNIFFER);
+
// free eventually allocated BigBuf memory
BigBuf_free();
// allocate the DMA buffer, used to stream samples from the FPGA
bool ReaderIsActive = FALSE;
bool TagIsActive = FALSE;
- iso14443a_setup(FPGA_HF_ISO14443A_SNIFFER);
-
// Set up the demodulator for tag -> reader responses.
DemodInit(receivedResponse, receivedResponsePar);
if (MfSniffLogic(receivedCmd, Uart.len, Uart.parity, Uart.bitCount, TRUE)) break;
/* And ready to receive another command. */
- UartInit(receivedCmd, receivedCmdPar);
+ UartReset();
/* And also reset the demod code */
DemodReset();
// And reset the Miller decoder including its (now outdated) input buffer
UartInit(receivedCmd, receivedCmdPar);
+ // why not UartReset?
}
TagIsActive = (Demod.state != DEMOD_UNSYNCD);
}
} // main cycle
- DbpString("COMMAND FINISHED");
-
FpgaDisableSscDma();
MfSniffEnd();
-
- Dbprintf("maxDataLen=%x, Uart.state=%x, Uart.len=%x", maxDataLen, Uart.state, Uart.len);
LEDsoff();
+ Dbprintf("maxDataLen=%x, Uart.state=%x, Uart.len=%x", maxDataLen, Uart.state, Uart.len);
+ set_tracing(FALSE);
}
projects / proxmark3-svn / blobdiff