255 lines
7.3 KiB
C
255 lines
7.3 KiB
C
/*-
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* Copyright (C) 2010, Romain Tartiere, Romuald Conty.
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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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* $Id$
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*/
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#include <err.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <string.h>
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#include <nfc/nfc.h>
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#include <freefare.h>
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#define MIN(a,b) ((a < b) ? a: b)
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MifareClassicKey default_keys[] = {
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{ 0xff,0xff,0xff,0xff,0xff,0xff },
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{ 0xd3,0xf7,0xd3,0xf7,0xd3,0xf7 },
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{ 0xa0,0xa1,0xa2,0xa3,0xa4,0xa5 },
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{ 0xb0,0xb1,0xb2,0xb3,0xb4,0xb5 },
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{ 0x4d,0x3a,0x99,0xc3,0x51,0xdd },
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{ 0x1a,0x98,0x2c,0x7e,0x45,0x9a },
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{ 0xaa,0xbb,0xcc,0xdd,0xee,0xff },
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{ 0x00,0x00,0x00,0x00,0x00,0x00 }
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};
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const MifareClassicKey mad_key_a = {
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0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5
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};
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const MifareClassicKey default_keyb = {
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0xd3, 0xf7, 0xd3, 0xf7, 0xd3, 0xf7
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};
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const uint8_t ndef_msg[34] = {
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0xd1, 0x02, 0x1c, 0x53, 0x70, 0x91, 0x01, 0x09,
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0x54, 0x02, 0x65, 0x6e, 0x4c, 0x69, 0x62, 0x6e,
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0x66, 0x63, 0x51, 0x01, 0x0b, 0x55, 0x03, 0x6c,
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0x69, 0x62, 0x6e, 0x66, 0x63, 0x2e, 0x6f, 0x72,
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0x67, 0xfe
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};
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int
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search_sector_key (MifareTag tag, MifareClassicBlockNumber block, MifareClassicKey *key, MifareClassicKeyType *key_type)
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{
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mifare_classic_disconnect (tag);
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for (int i = 0; i < (sizeof (default_keys) / sizeof (MifareClassicKey)); i++) {
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if ((0 == mifare_classic_connect (tag)) && (0 == mifare_classic_authenticate (tag, block, default_keys[i], MFC_KEY_A))) {
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if ((1 == mifare_classic_get_trailer_block_permission (tag, block + 3, MCAB_WRITE_KEYA, MFC_KEY_A)) &&
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(1 == mifare_classic_get_trailer_block_permission (tag, block + 3, MCAB_WRITE_ACCESS_BITS, MFC_KEY_A)) &&
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(1 == mifare_classic_get_trailer_block_permission (tag, block + 3, MCAB_WRITE_KEYB, MFC_KEY_A))) {
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memcpy (key, &default_keys[i], sizeof (MifareClassicKey));
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*key_type = MFC_KEY_A;
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return 1;
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}
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}
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if ((0 == mifare_classic_connect (tag)) && (0 == mifare_classic_authenticate (tag, block, default_keys[i], MFC_KEY_B))) {
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if (((block == 0) || (1 == mifare_classic_get_data_block_permission (tag, block + 0, MCAB_W, MFC_KEY_B))) &&
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(1 == mifare_classic_get_data_block_permission (tag, block + 1, MCAB_W, MFC_KEY_B)) &&
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(1 == mifare_classic_get_data_block_permission (tag, block + 2, MCAB_W, MFC_KEY_B)) &&
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(1 == mifare_classic_get_trailer_block_permission (tag, block + 3, MCAB_WRITE_KEYA, MFC_KEY_B)) &&
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(1 == mifare_classic_get_trailer_block_permission (tag, block + 3, MCAB_WRITE_ACCESS_BITS, MFC_KEY_B)) &&
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(1 == mifare_classic_get_trailer_block_permission (tag, block + 3, MCAB_WRITE_KEYB, MFC_KEY_B))) {
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memcpy (key, &default_keys[i], sizeof (MifareClassicKey));
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*key_type = MFC_KEY_B;
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return 1;
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}
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}
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}
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warnx ("No known authentication key for block %d", block);
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return 0;
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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 error = 0;
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nfc_device_t *device = NULL;
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MifareTag *tags = NULL;
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MifareClassicKey key_00, key_01, key_10;
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MifareClassicKeyType key_00_type, key_01_type, key_10_type;
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MifareClassicBlock block;
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Mad mad;
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(void)argc;
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(void)argv;
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device = nfc_connect (NULL);
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if (!device)
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errx (EXIT_FAILURE, "No NFC device found.");
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tags = freefare_get_tags (device);
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if (!tags) {
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nfc_disconnect (device);
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errx (EXIT_FAILURE, "Error listing MIFARE classic tag.");
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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 CLASSIC_1K:
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case CLASSIC_4K:
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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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char buffer[BUFSIZ];
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printf ("Found %s with UID %s. Write NDEF [yN] ", freefare_get_tag_friendly_name (tags[i]), tag_uid);
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fgets (buffer, BUFSIZ, stdin);
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bool write_ndef = ((buffer[0] == 'y') || (buffer[0] == 'Y'));
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if (write_ndef) {
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switch (freefare_get_tag_type (tags[i])) {
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case CLASSIC_4K:
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if (!search_sector_key (tags[i], 0x40, &key_10, &key_10_type)) {
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error = 1;
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goto error;
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}
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case CLASSIC_1K:
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if (!search_sector_key (tags[i], 0x00, &key_00, &key_00_type)) {
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error = 1;
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goto error;
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}
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break;
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default:
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/* Keep compiler quiet */
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break;
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}
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if (!search_sector_key (tags[i], 0x04, &key_01, &key_01_type)) {
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error = 1;
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goto error;
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}
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if (!error) {
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/* Ensure the auth key is always a B one. If not, change it! */
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switch (freefare_get_tag_type (tags[i])) {
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case CLASSIC_4K:
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if (key_10_type != MFC_KEY_B) {
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mifare_classic_trailer_block (&block, mad_key_a, 0x0, 0x1, 0x1, 0x6, 0x00, default_keyb);
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if (mifare_classic_authenticate (tags[i], 0x10, key_10, key_10_type) < 0) {
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perror ("mifare_classic_authenticate");
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error = 1;
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goto error;
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}
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if (mifare_classic_write (tags[i], 0x43, block) < 0) {
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perror ("mifare_classic_write");
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error = 1;
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goto error;
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}
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memcpy (&key_10, &default_keyb, sizeof (MifareClassicKey));
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key_10_type = MFC_KEY_B;
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}
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case CLASSIC_1K:
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if (key_00_type != MFC_KEY_B) {
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mifare_classic_trailer_block (&block, mad_key_a, 0x0, 0x1, 0x1, 0x6, 0x00, default_keyb);
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if (mifare_classic_authenticate (tags[i], 0x00, key_00, key_00_type) < 0) {
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perror ("mifare_classic_authenticate");
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error = 1;
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goto error;
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}
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if (mifare_classic_write (tags[i], 0x03, block) < 0) {
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perror ("mifare_classic_write");
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error = 1;
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goto error;
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}
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memcpy (&key_00, &default_keyb, sizeof (MifareClassicKey));
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key_00_type = MFC_KEY_B;
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}
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break;
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default:
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/* Keep compiler quiet */
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break;
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}
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}
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if (!(mad = mad_new ((freefare_get_tag_type (tags[i]) == CLASSIC_4K) ? 2 : 1))) {
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perror ("mad_new");
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error = 1;
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goto error;
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}
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MadAid aid = {
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.function_cluster_code = 0xe1,
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.application_code = 0x03
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};
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mad_set_aid (mad, 1, aid);
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if (mad_write (tags[i], mad, key_00, key_10) < 0) {
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perror ("mad_write");
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error = 1;
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goto error;
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}
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size_t encoded_size;
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off_t pos = 0;
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uint8_t *tlv_data = tlv_encode (3, ndef_msg, sizeof (ndef_msg), &encoded_size);
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MifareClassicBlockNumber bn = 0x04;
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if (mifare_classic_authenticate (tags[i], bn, key_01, key_01_type) < 0) {
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perror ("mifare_classic_authenticate");
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error = 1;
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goto error;
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}
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MifareClassicBlock data;
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while (pos < encoded_size) {
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memset (&data, '\0', sizeof (MifareClassicBlock));
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memcpy (&data, tlv_data + pos, MIN (encoded_size - pos, sizeof (MifareClassicBlock)));
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pos += sizeof (MifareClassicBlock);
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if (bn == 0x07)
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abort();
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if (mifare_classic_write (tags[i], bn++, data) < 0) {
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perror ("mifare_classic_write");
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error = 1;
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goto error;
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}
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}
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free (tlv_data);
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free (mad);
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}
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error:
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free (tag_uid);
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}
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freefare_free_tags (tags);
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nfc_disconnect (device);
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exit (error);
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}
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