260 lines
7.7 KiB
C
260 lines
7.7 KiB
C
#if defined(HAVE_CONFIG_H)
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#include "config.h"
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#endif
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#include <err.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <freefare.h>
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/*
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* This example was written based on information provided by the
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* following documents:
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*
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* Mifare DESFire as Type 4 Tag
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* NFC Forum Type 4 Tag Extensions for Mifare DESFire
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* Rev. 1.1 - 21 August 2007
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* Rev. 2.2 - 4 January 2012
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*
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*/
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// Note that it is using specific Desfire commands, not ISO7816 NDEF Tag Type4 commands
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uint8_t key_data_app[8] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
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uint8_t *cc_data;
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uint8_t *ndef_msg;
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uint16_t ndef_msg_len;
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struct {
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bool interactive;
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} read_options = {
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.interactive = true
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};
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static void
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usage(char *progname)
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{
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fprintf(stderr, "This application reads a NDEF payload from a Mifare DESFire formatted as NFC Forum Type 4 Tag.\n");
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fprintf(stderr, "usage: %s [-y] -o FILE [-k 11223344AABBCCDD]\n", progname);
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fprintf(stderr, "\nOptions:\n");
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fprintf(stderr, " -y Do not ask for confirmation\n");
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fprintf(stderr, " -o Extract NDEF message if available in FILE\n");
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fprintf(stderr, " -k Provide another NDEF Tag Application key than the default one\n");
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}
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int
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main(int argc, char *argv[])
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{
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int ch;
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int error = EXIT_SUCCESS;
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nfc_device *device = NULL;
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FreefareTag *tags = NULL;
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char *ndef_output = NULL;
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while ((ch = getopt(argc, argv, "hyo:k:")) != -1) {
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switch (ch) {
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case 'h':
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usage(argv[0]);
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exit(EXIT_SUCCESS);
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break;
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case 'y':
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read_options.interactive = false;
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break;
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case 'o':
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ndef_output = optarg;
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break;
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case 'k':
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if (strlen(optarg) != 16) {
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usage(argv[0]);
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exit(EXIT_FAILURE);
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}
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uint64_t n = strtoull(optarg, NULL, 16);
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int i;
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for (i = 7; i >= 0; i--) {
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key_data_app[i] = (uint8_t) n;
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n >>= 8;
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}
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break;
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default:
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usage(argv[0]);
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exit(EXIT_FAILURE);
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}
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}
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// Remaining args, if any, are in argv[optind .. (argc-1)]
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if (ndef_output == NULL) {
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usage(argv[0]);
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exit(EXIT_FAILURE);
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}
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FILE *message_stream = NULL;
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FILE *ndef_stream = NULL;
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if ((strlen(ndef_output) == 1) && (ndef_output[0] == '-')) {
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message_stream = stderr;
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ndef_stream = stdout;
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} else {
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message_stream = stdout;
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ndef_stream = fopen(ndef_output, "wb");
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if (!ndef_stream) {
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fprintf(stderr, "Could not open file %s.\n", ndef_output);
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exit(EXIT_FAILURE);
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}
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}
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nfc_connstring devices[8];
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size_t device_count;
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nfc_context *context;
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nfc_init(&context);
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if (context == NULL)
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errx(EXIT_FAILURE, "Unable to init libnfc (malloc)");
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device_count = nfc_list_devices(context, devices, 8);
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if (device_count <= 0)
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errx(EXIT_FAILURE, "No NFC device found.");
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for (size_t d = 0; d < device_count; d++) {
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device = nfc_open(context, devices[d]);
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if (!device) {
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warnx("nfc_open() failed.");
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error = EXIT_FAILURE;
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continue;
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}
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tags = freefare_get_tags(device);
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if (!tags) {
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nfc_close(device);
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errx(EXIT_FAILURE, "Error listing tags.");
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}
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for (int i = 0; (!error) && tags[i]; i++) {
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if (MIFARE_DESFIRE != freefare_get_tag_type(tags[i]))
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continue;
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char *tag_uid = freefare_get_tag_uid(tags[i]);
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char buffer[BUFSIZ];
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fprintf(message_stream, "Found %s with UID %s. ", freefare_get_tag_friendly_name(tags[i]), tag_uid);
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bool read_ndef = true;
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if (read_options.interactive) {
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fprintf(message_stream, "Read NDEF [yN] ");
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fgets(buffer, BUFSIZ, stdin);
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read_ndef = ((buffer[0] == 'y') || (buffer[0] == 'Y'));
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} else {
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fprintf(message_stream, "\n");
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}
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if (read_ndef) {
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int res;
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res = mifare_desfire_connect(tags[i]);
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if (res < 0) {
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warnx("Can't connect to Mifare DESFire target.");
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error = EXIT_FAILURE;
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break;
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}
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// We've to track DESFire version as NDEF mapping is different
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struct mifare_desfire_version_info info;
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res = mifare_desfire_get_version(tags[i], &info);
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if (res < 0) {
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freefare_perror(tags[i], "mifare_desfire_get_version");
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error = 1;
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break;
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}
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MifareDESFireKey key_app;
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key_app = mifare_desfire_des_key_new_with_version(key_data_app);
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// Mifare DESFire SelectApplication (Select application)
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MifareDESFireAID aid;
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if (info.software.version_major == 0)
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aid = mifare_desfire_aid_new(0xEEEE10);
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else
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// There is no more relationship between DESFire AID and ISO AID...
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// Let's assume it's in AID 000001h as proposed in the spec
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aid = mifare_desfire_aid_new(0x000001);
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res = mifare_desfire_select_application(tags[i], aid);
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if (res < 0)
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errx(EXIT_FAILURE, "Application selection failed. Try mifare-desfire-create-ndef before running %s.", argv[0]);
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free(aid);
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// Authentication with NDEF Tag Application master key (Authentication with key 0)
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res = mifare_desfire_authenticate(tags[i], 0, key_app);
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if (res < 0)
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errx(EXIT_FAILURE, "Authentication with NDEF Tag Application master key failed");
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// Read Capability Container file E103
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uint8_t lendata[20]; // cf FIXME in mifare_desfire.c read_data()
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if (info.software.version_major == 0)
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res = mifare_desfire_read_data(tags[i], 0x03, 0, 2, lendata);
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else
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// There is no more relationship between DESFire FID and ISO FileID...
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// Let's assume it's in FID 01h as proposed in the spec
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res = mifare_desfire_read_data(tags[i], 0x01, 0, 2, lendata);
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if (res < 0)
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errx(EXIT_FAILURE, "Read CC len failed");
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uint16_t cclen = (((uint16_t) lendata[0]) << 8) + ((uint16_t) lendata[1]);
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if (cclen < 15)
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errx(EXIT_FAILURE, "CC too short IMHO");
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if (!(cc_data = malloc(cclen + 20))) // cf FIXME in mifare_desfire.c read_data()
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errx(EXIT_FAILURE, "malloc");
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if (info.software.version_major == 0)
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res = mifare_desfire_read_data(tags[i], 0x03, 0, cclen, cc_data);
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else
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res = mifare_desfire_read_data(tags[i], 0x01, 0, cclen, cc_data);
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if (res < 0)
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errx(EXIT_FAILURE, "Read CC data failed");
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// Search NDEF File Control TLV
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uint8_t off = 7;
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while (((off + 7) < cclen) && (cc_data[off] != 0x04)) {
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// Skip TLV
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off += cc_data[off + 1] + 2;
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}
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if (off + 7 >= cclen)
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errx(EXIT_FAILURE, "CC does not contain expected NDEF File Control TLV");
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if (cc_data[off + 2] != 0xE1)
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errx(EXIT_FAILURE, "Unknown NDEF File reference in CC");
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uint8_t file_no;
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if (info.software.version_major == 0)
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file_no = cc_data[off + 3];
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else
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// There is no more relationship between DESFire FID and ISO FileID...
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// Let's assume it's in FID 02h as proposed in the spec
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file_no = 2;
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uint16_t ndefmaxlen = (((uint16_t) cc_data[off + 4]) << 8) + ((uint16_t) cc_data[off + 5]);
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fprintf(message_stream, "Max NDEF size: %i bytes\n", ndefmaxlen);
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if (!(ndef_msg = malloc(ndefmaxlen + 20))) // cf FIXME in mifare_desfire.c read_data()
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errx(EXIT_FAILURE, "malloc");
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res = mifare_desfire_read_data(tags[i], file_no, 0, 2, lendata);
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if (res < 0)
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errx(EXIT_FAILURE, "Read NDEF len failed");
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ndef_msg_len = (((uint16_t) lendata[0]) << 8) + ((uint16_t) lendata[1]);
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fprintf(message_stream, "NDEF size: %i bytes\n", ndef_msg_len);
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if (ndef_msg_len + 2 > ndefmaxlen)
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errx(EXIT_FAILURE, "Declared NDEF size larger than max NDEF size");
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res = mifare_desfire_read_data(tags[i], file_no, 2, ndef_msg_len, ndef_msg);
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if (res < 0)
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errx(EXIT_FAILURE, "Read data failed");
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if (fwrite(ndef_msg, 1, ndef_msg_len, ndef_stream) != ndef_msg_len)
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errx(EXIT_FAILURE, "Write to file failed");
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free(cc_data);
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free(ndef_msg);
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mifare_desfire_key_free(key_app);
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mifare_desfire_disconnect(tags[i]);
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}
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free(tag_uid);
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}
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freefare_free_tags(tags);
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nfc_close(device);
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}
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nfc_exit(context);
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exit(error);
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}
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