/*-
* Copyright (C) 2010, Audrey Diacre.
*
* This program is free software: you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by the
* Free Software Foundation, either version 3 of the License, or (at your
* option) any later version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see
*
* $Id$
*/
#include "config.h"
#include
#include
#include
#include
#include
/*
* This example was written based on information provided by the
* following documents:
*
* Mifare DESFire as Type 4 Tag
* NFC Forum Type 4 Tag Extensions for Mifare DESFire
* Rev. 1.1 - 21 August 2007
* Rev. 2.2 - 4 January 2012
*
*/
// Note that it is using specific Desfire commands, not ISO7816 NDEF Tag Type4 commands
uint8_t key_data_app[8] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
uint8_t *cc_data;
uint8_t *ndef_msg;
uint16_t ndef_msg_len;
struct {
bool interactive;
} read_options = {
.interactive = true
};
static void
usage(char *progname)
{
fprintf (stderr, "This application reads a NDEF payload from a Mifare DESFire formatted as NFC Forum Type 4 Tag.\n");
fprintf (stderr, "usage: %s [-y] -o FILE [-k 11223344AABBCCDD]\n", progname);
fprintf (stderr, "\nOptions:\n");
fprintf (stderr, " -y Do not ask for confirmation\n");
fprintf (stderr, " -o Extract NDEF message if available in FILE\n");
fprintf (stderr, " -k Provide another NDEF Tag Application key than the default one\n");
}
int
main(int argc, char *argv[])
{
int ch;
int error = EXIT_SUCCESS;
nfc_device *device = NULL;
MifareTag *tags = NULL;
char *ndef_output = NULL;
while ((ch = getopt (argc, argv, "hyo:k:")) != -1) {
switch (ch) {
case 'h':
usage(argv[0]);
exit (EXIT_SUCCESS);
break;
case 'y':
read_options.interactive = false;
break;
case 'o':
ndef_output = optarg;
break;
case 'k':
if (strlen(optarg) != 16) {
usage(argv[0]);
exit (EXIT_FAILURE);
}
uint64_t n = strtoull(optarg, NULL, 16);
int i;
for (i=7; i>=0; i--) {
key_data_app[i] = (uint8_t) n;
n >>= 8;
}
break;
default:
usage(argv[0]);
exit (EXIT_FAILURE);
}
}
// Remaining args, if any, are in argv[optind .. (argc-1)]
if (ndef_output == NULL) {
usage (argv[0]);
exit (EXIT_FAILURE);
}
FILE* message_stream = NULL;
FILE* ndef_stream = NULL;
if ((strlen (ndef_output) == 1) && (ndef_output[0] == '-')) {
message_stream = stderr;
ndef_stream = stdout;
} else {
message_stream = stdout;
ndef_stream = fopen(ndef_output, "wb");
if (!ndef_stream) {
fprintf (stderr, "Could not open file %s.\n", ndef_output);
exit (EXIT_FAILURE);
}
}
nfc_connstring devices[8];
size_t device_count;
nfc_init(NULL);
device_count = nfc_list_devices (NULL, devices, 8);
if (device_count <= 0)
errx (EXIT_FAILURE, "No NFC device found.");
for (size_t d = 0; d < device_count; d++) {
device = nfc_open (NULL, devices[d]);
if (!device) {
warnx ("nfc_open() failed.");
error = EXIT_FAILURE;
continue;
}
tags = freefare_get_tags (device);
if (!tags) {
nfc_close (device);
errx (EXIT_FAILURE, "Error listing tags.");
}
for (int i = 0; (!error) && tags[i]; i++) {
if (DESFIRE != freefare_get_tag_type (tags[i]))
continue;
char *tag_uid = freefare_get_tag_uid (tags[i]);
char buffer[BUFSIZ];
fprintf (message_stream, "Found %s with UID %s. ", freefare_get_tag_friendly_name (tags[i]), tag_uid);
bool read_ndef = true;
if (read_options.interactive) {
fprintf (message_stream, "Read NDEF [yN] ");
fgets (buffer, BUFSIZ, stdin);
read_ndef = ((buffer[0] == 'y') || (buffer[0] == 'Y'));
} else {
fprintf (message_stream, "\n");
}
if (read_ndef) {
int res;
res = mifare_desfire_connect (tags[i]);
if (res < 0) {
warnx ("Can't connect to Mifare DESFire target.");
error = EXIT_FAILURE;
break;
}
// We've to track DESFire version as NDEF mapping is different
struct mifare_desfire_version_info info;
res = mifare_desfire_get_version (tags[i], &info);
if (res < 0) {
freefare_perror (tags[i], "mifare_desfire_get_version");
error = 1;
break;
}
MifareDESFireKey key_app;
key_app = mifare_desfire_des_key_new_with_version (key_data_app);
// Mifare DESFire SelectApplication (Select application)
MifareDESFireAID aid;
if (info.software.version_major==0)
aid = mifare_desfire_aid_new(0xEEEE10);
else
// There is no more relationship between DESFire AID and ISO AID...
// Let's assume it's in AID 000001h as proposed in the spec
aid = mifare_desfire_aid_new(0x000001);
res = mifare_desfire_select_application(tags[i], aid);
if (res < 0)
errx (EXIT_FAILURE, "Application selection failed. Try mifare-desfire-create-ndef before running %s.", argv[0]);
free (aid);
// Authentication with NDEF Tag Application master key (Authentication with key 0)
res = mifare_desfire_authenticate (tags[i], 0, key_app);
if (res < 0)
errx (EXIT_FAILURE, "Authentication with NDEF Tag Application master key failed");
// Read Capability Container file E103
uint8_t lendata[2];
if (info.software.version_major==0)
res = mifare_desfire_read_data (tags[i], 0x03, 0, 2, lendata);
else
// There is no more relationship between DESFire FID and ISO FileID...
// Let's assume it's in FID 01h as proposed in the spec
res = mifare_desfire_read_data (tags[i], 0x01, 0, 2, lendata);
if (res < 0)
errx (EXIT_FAILURE, "Read CC len failed");
uint16_t cclen = (((uint16_t) lendata[0]) << 8) + ((uint16_t) lendata[1]);
if (cclen < 15)
errx (EXIT_FAILURE, "CC too short IMHO");
if (!(cc_data = malloc(cclen)))
errx (EXIT_FAILURE, "malloc");
if (info.software.version_major==0)
res = mifare_desfire_read_data (tags[i], 0x03, 0, cclen, cc_data);
else
res = mifare_desfire_read_data (tags[i], 0x01, 0, cclen, cc_data);
if (res < 0)
errx (EXIT_FAILURE, "Read CC data failed");
// Search NDEF File Control TLV
uint8_t off = 7;
while (((off+7) < cclen) && (cc_data[off] != 0x04)) {
// Skip TLV
off += cc_data[off+1] + 2;
}
if (off+7 >= cclen)
errx (EXIT_FAILURE, "CC does not contain expected NDEF File Control TLV");
if (cc_data[off+2] != 0xE1)
errx (EXIT_FAILURE, "Unknown NDEF File reference in CC");
uint8_t file_no;
if (info.software.version_major==0)
file_no = cc_data[off+3];
else
// There is no more relationship between DESFire FID and ISO FileID...
// Let's assume it's in FID 02h as proposed in the spec
file_no = 2;
uint16_t ndefmaxlen = (((uint16_t) cc_data[off+4]) << 8) + ((uint16_t) cc_data[off+5]);
fprintf (message_stream, "Max NDEF size: %i bytes\n", ndefmaxlen);
if (!(ndef_msg = malloc(ndefmaxlen)))
errx (EXIT_FAILURE, "malloc");
res = mifare_desfire_read_data (tags[i], file_no, 0, 2, lendata);
if (res < 0)
errx (EXIT_FAILURE, "Read NDEF len failed");
ndef_msg_len = (((uint16_t) lendata[0]) << 8) + ((uint16_t) lendata[1]);
fprintf (message_stream, "NDEF size: %i bytes\n", ndef_msg_len);
if (ndef_msg_len + 2 > ndefmaxlen)
errx (EXIT_FAILURE, "Declared NDEF size larger than max NDEF size");
res = mifare_desfire_read_data (tags[i], file_no, 2, ndef_msg_len, ndef_msg);
if (res < 0)
errx (EXIT_FAILURE, "Read data failed");
if (fwrite (ndef_msg, 1, ndef_msg_len, ndef_stream) != ndef_msg_len)
errx (EXIT_FAILURE, "Write to file failed");
free (cc_data);
free (ndef_msg);
mifare_desfire_key_free (key_app);
mifare_desfire_disconnect (tags[i]);
}
free (tag_uid);
}
freefare_free_tags (tags);
nfc_close (device);
}
nfc_exit(NULL);
exit (error);
}