146 lines
3.9 KiB
C
146 lines
3.9 KiB
C
/*-
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* Copyright (C) 2012, 2017 Romain Tartiere, Martin Dagarin (SloCompTech).
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*
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* This program is free software: you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as published by the
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* Free Software Foundation, either version 3 of the License, or (at your
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* option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>
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*/
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#include <err.h>
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#include <stdlib.h>
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#include <nfc/nfc.h>
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#include <freefare.h>
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int
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main(int argc, char *argv[])
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{
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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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if (argc > 1)
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errx(EXIT_FAILURE, "usage: %s", argv[0]);
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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, sizeof(devices) / sizeof(*devices));
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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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if (!(device = nfc_open(context, devices[d]))) {
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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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if (!(tags = freefare_get_tags(device))) {
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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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switch (freefare_get_tag_type(tags[i])) {
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case NTAG_21x:
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break;
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default:
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continue;
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}
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char *tag_uid = freefare_get_tag_uid(tags[i]);
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printf("Tag with UID %s is a %s\n", tag_uid, freefare_get_tag_friendly_name(tags[i]));
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FreefareTag tag = tags[i];
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int res;
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if (ntag21x_connect(tag) < 0)
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errx(EXIT_FAILURE, "Error connecting to tag.");
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uint8_t pwd[4] = {0xff, 0xff, 0xff, 0xff};
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uint8_t pack[2] = {0xaa, 0xaa};
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uint8_t pack_old[2] = {0x00, 0x00};
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NTAG21xKey key;
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NTAG21xKey key_old;
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key = ntag21x_key_new(pwd, pack); // Creating key
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key_old = ntag21x_key_new(pwd, pack_old); // Creating key
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uint8_t auth0 = 0x00; // Buffer for auth0 byte
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switch (true) {
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case true:
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/*
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Get information about tag
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MUST do, because here we are recognizing tag subtype (NTAG213,NTAG215,NTAG216), and gathering all parameters
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*/
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res = ntag21x_get_info(tag);
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if (res < 0) {
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printf("Error getting info from tag\n");
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break;
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}
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// Authenticate with tag
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res = ntag21x_authenticate(tag, key);
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if (res < 0) {
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printf("Error getting info from tag\n");
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break;
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}
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// Get auth byte from tag
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res = ntag21x_get_auth(tag, &auth0);
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if (res < 0) {
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printf("Error getting auth0 byte from tag\n");
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break;
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}
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printf("Old auth0: %#02x\n", auth0);
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// Set old key
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res = ntag21x_set_key(tag, key_old);
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if (res < 0) {
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printf("Error setting key tag\n");
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break;
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}
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// Disable password protection (when auth0 byte > last page)
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res = ntag21x_set_auth(tag, 0xff);
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if (res < 0) {
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printf("Error setting auth0 byte \n");
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break;
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}
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// Disable read & write pwd protection -> (default: write only protection)
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res = ntag21x_access_disable(tag, NTAG_PROT);
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if (res < 0) {
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printf("Error setting access byte \n");
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break;
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}
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// Get auth byte from tag
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res = ntag21x_get_auth(tag, &auth0);
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if (res < 0) {
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printf("Error getting auth0 byte from tag\n");
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break;
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}
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printf("New auth0: %#02x\n", auth0);
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}
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ntag21x_disconnect(tag);
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ntag21x_key_free(key); // Delete key
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ntag21x_key_free(key_old); // Delete key
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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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