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084866dbbc
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46
nfc_init.c
46
nfc_init.c
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@ -4,32 +4,32 @@
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#include "poll_desfire.h"
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#include "poll_desfire.h"
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int init(nfc_context **context, nfc_device **device) {
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int init(nfc_context **context, nfc_device **device) {
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nfc_connstring devices[8];
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nfc_connstring devices[8];
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size_t device_count;
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size_t device_count;
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nfc_init(context);
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nfc_init(context);
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if (context == NULL) {
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if (context == NULL) {
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errx(EXIT_FAILURE, "Unable to init libnfc (malloc)");
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errx(EXIT_FAILURE, "Unable to init libnfc (malloc)");
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}
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}
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device_count = nfc_list_devices(*context, devices, sizeof(devices) / sizeof(devices[0]));
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device_count = nfc_list_devices(*context, devices, sizeof(devices) / sizeof(devices[0]));
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if (device_count <= 0) {
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if (device_count <= 0) {
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errx(EXIT_FAILURE, "No NFC device found.");
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errx(EXIT_FAILURE, "No NFC device found.");
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}
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}
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if (device_count > 1) {
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printf("More than 1 device available. Using %s\n", devices[0]);
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}
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*device = nfc_open(*context, devices[0]);
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if (device_count > 1) {
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if (!device) {
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printf("More than 1 device available. Using %s\n", devices[0]);
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errx(EXIT_FAILURE, "nfc_open() failed.");
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}
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}
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if (nfc_initiator_init(*device) < 0) {
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errx(EXIT_FAILURE, "Initiator failed.");
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}
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return 0;
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*device = nfc_open(*context, devices[0]);
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if (!device) {
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errx(EXIT_FAILURE, "nfc_open() failed.");
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}
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if (nfc_initiator_init(*device) < 0) {
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errx(EXIT_FAILURE, "Initiator failed.");
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}
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return 0;
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}
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}
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void poll_target(nfc_device *device);
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void poll_target(nfc_device *device);
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326
poll_desfire.c
326
poll_desfire.c
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@ -7,186 +7,204 @@
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#include <string.h>
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#include <string.h>
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#include "poll_desfire.h"
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#include "poll_desfire.h"
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#define AID 0x22eaa0
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#define AID 0x22eaa0
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#define RANDOM_UID_SIZE 8
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#define RANDOM_UID_SIZE 8
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void init_keys(MifareDESFireKey *null_key, MifareDESFireKey *master_key, char const *name) {
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void init_keys(MifareDESFireKey *null_key, MifareDESFireKey *master_key, char const *name) {
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uint8_t const key_data_null[8] = {0, 0, 0, 0, 0, 0, 0, 0};
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uint8_t const key_data_null[8] = {0, 0, 0, 0, 0, 0, 0, 0};
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*null_key = mifare_desfire_des_key_new_with_version(key_data_null);
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*null_key = mifare_desfire_des_key_new_with_version(key_data_null);
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uint8_t key_data_real[16] = {0};
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uint8_t key_data_real[16] = {0};
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{
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{
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FILE *f = fopen(name, "rb");
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FILE *f = fopen(name, "rb");
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if (!f) {
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if (!f) {
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errx(EXIT_FAILURE, "error opening key file: %s", name);
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errx(EXIT_FAILURE, "error opening key file: %s", name);
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}
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}
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if (fread(key_data_real, 1, sizeof key_data_real, f) < sizeof key_data_real) {
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if (fread(key_data_real, 1, sizeof key_data_real, f) < sizeof key_data_real) {
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errx(EXIT_FAILURE, "key file too small.");
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errx(EXIT_FAILURE, "key file too small.");
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}
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}
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fclose(f);
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fclose(f);
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}
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}
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*master_key = mifare_desfire_aes_key_new(key_data_real);
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*master_key = mifare_desfire_aes_key_new(key_data_real);
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}
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}
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int main(int argc, char **argv) {
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int main(int argc, char **argv) {
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int error = EXIT_SUCCESS;
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int error = EXIT_SUCCESS;
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nfc_context *context = NULL;
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nfc_context *context = NULL;
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nfc_device *device = NULL;
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nfc_device *device = NULL;
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FreefareTag *tags = NULL;
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FreefareTag *tags = NULL;
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MifareDESFireKey key_null, key_master;
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MifareDESFireKey key_null, key_master;
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MifareDESFireAID aid = mifare_desfire_aid_new(AID);
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MifareDESFireAID aid = mifare_desfire_aid_new(AID);
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error = init(&context, &device);
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error = init(&context, &device);
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init_keys(&key_null, &key_master, (argc > 1) ? argv[1] : "key");
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init_keys(&key_null, &key_master, (argc > 1) ? argv[1] : "key");
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FILE *out = argc > 2 ? fopen(argv[2], "w") : stdout;
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FILE *out = argc > 2 ? fopen(argv[2], "w") : stdout;
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while (true) {
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while (true) {
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tags = freefare_get_tags(device);
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tags = freefare_get_tags(device);
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if (!tags) {
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if (!tags) {
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nfc_close(device);
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nfc_close(device);
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errx(EXIT_FAILURE, "Error listing tags.");
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errx(EXIT_FAILURE, "Error listing tags.");
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}
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}
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for (int id = 0; tags[id]; id++) {
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for (int id = 0; tags[id]; id++) {
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FreefareTag tag = tags[id];
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FreefareTag tag = tags[id];
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if (MIFARE_DESFIRE != freefare_get_tag_type(tag))
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if (MIFARE_DESFIRE != freefare_get_tag_type(tag))
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continue;
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continue;
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char *tag_uid = freefare_get_tag_uid(tag);
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/* Result of various operations */
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int res;
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res = mifare_desfire_connect(tag);
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if (res < 0) {
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warnx("Can't connect to Mifare DESFire target.");
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goto next_tag;
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}
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if (mifare_desfire_select_application(tag, aid) != 0) {
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char *tag_uid = freefare_get_tag_uid(tag);
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// Check for old card with our key as master key
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/* Result of various operations */
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res = mifare_desfire_authenticate(tag, 0, key_master);
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int res;
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if (res >= 0) {
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warnx("Old tag detected: %s", tag_uid);
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res = mifare_desfire_change_key(tag, 0, key_master, key_null);
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}
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// Card needs to have default null key as master
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res = mifare_desfire_authenticate(tag, 0, key_null);
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if (res < 0) {
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warnx("Could not authenticate: %d", res);
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goto next_tag;
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}
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// create application
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res = mifare_desfire_connect(tag);
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res = mifare_desfire_create_application_aes(tag, aid, MDAPP_SETTINGS(0, 1, 0, 0, 1), 1);
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if (res < 0) {
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if (res < 0) {
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warnx("Can't connect to Mifare DESFire target.");
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warnx("Could not create application: %d", res);
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goto next_tag;
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goto next_tag;
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}
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}
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// Select it
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if (mifare_desfire_select_application(tag, aid) != 0) {
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res = mifare_desfire_select_application(tag, aid);
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// Check for old card with our key as master key
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if (res < 0) {
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res = mifare_desfire_authenticate(tag, 0, key_master);
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warnx("Application not selectable after creation: %d", res);
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if (res >= 0) {
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goto next_tag;
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warnx("Old tag detected: %s", tag_uid);
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}
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res =
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mifare_desfire_change_key(tag, 0, key_null, key_master);
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if (res < 0) {
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warnx("Could not change key: %d", res);
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goto next_tag;
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}
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}
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// Key should be null
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// Card needs to have default null key as master
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res = mifare_desfire_authenticate_aes(tag, 0, key_null);
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res = mifare_desfire_authenticate(tag, 0, key_null);
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if (res < 0) {
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if (res < 0) {
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warnx("Could not authenticate new application with default key: %d", res);
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warnx("Could not authenticate: %d", res);
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goto next_tag;
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goto next_tag;
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}
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}
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// Update to our key
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// create application
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res = mifare_desfire_change_key(tag, 0, key_master, key_null);
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res = mifare_desfire_create_application_aes(
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if (res < 0) {
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tag, aid, MDAPP_SETTINGS(0, 1, 0, 0, 1), 1);
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warnx("Could not change key of new application to master key: %d", res);
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if (res < 0) {
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goto next_tag;
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warnx("Could not create application: %d", res);
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}
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goto next_tag;
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}
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// Authenticate with new key
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res = mifare_desfire_authenticate_aes(tag, 0, key_master);
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if (res < 0) {
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warnx("Could not authenticate new application with our key: %d", res);
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goto next_tag;
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}
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// Create file
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// Select it
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res = mifare_desfire_create_std_data_file(tag, 0, 0, MDAR(0, 0, 0, 0), RANDOM_UID_SIZE);
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res = mifare_desfire_select_application(tag, aid);
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if (res < 0) {
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if (res < 0) {
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warnx("Could not create data file: %d", res);
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warnx("Application not selectable after creation: %d", res);
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goto next_tag;
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goto next_tag;
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}
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}
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// Grab random data for it
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// Key should be null
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unsigned char uid_data[RANDOM_UID_SIZE];
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res = mifare_desfire_authenticate_aes(tag, 0, key_null);
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{
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if (res < 0) {
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int fd = open("/dev/urandom", O_RDONLY);
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warnx(
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if (fd < 0) {
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"Could not authenticate new application with default "
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warnx("Could not open /dev/urandom");
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"key: %d",
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goto next_tag;
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res);
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}
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goto next_tag;
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}
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if (RANDOM_UID_SIZE != read(fd, &uid_data[0], RANDOM_UID_SIZE)) {
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// Update to our key
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warnx("Could not read data from /dev/random");
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res = mifare_desfire_change_key(tag, 0, key_master, key_null);
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goto next_tag;
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if (res < 0) {
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}
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warnx(
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close(fd);
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"Could not change key of new application to master "
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}
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"key: %d",
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res);
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goto next_tag;
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}
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// Write data
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// Authenticate with new key
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res = mifare_desfire_write_data(tag, 0, 0, RANDOM_UID_SIZE, &uid_data[0]);
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res = mifare_desfire_authenticate_aes(tag, 0, key_master);
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if (res < 0) {
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if (res < 0) {
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warnx("Could not write UID data to tag: %d", res);
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warnx(
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goto next_tag;
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"Could not authenticate new application with our key: "
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}
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"%d",
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}
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res);
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goto next_tag;
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}
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// Authenticate with our key
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// Create file
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res = mifare_desfire_authenticate_aes(tag, 0, key_master);
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res = mifare_desfire_create_std_data_file(
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if (res < 0) {
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tag, 0, 0, MDAR(0, 0, 0, 0), RANDOM_UID_SIZE);
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warnx("Authentication on application failed: %d", res);
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if (res < 0) {
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goto next_tag;
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warnx("Could not create data file: %d", res);
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}
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goto next_tag;
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}
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// Grab UID
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// Grab random data for it
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uint8_t data[RANDOM_UID_SIZE];
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unsigned char uid_data[RANDOM_UID_SIZE];
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res = mifare_desfire_read_data(tag, 0, 0, RANDOM_UID_SIZE, &data[0]);
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{
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if (res != RANDOM_UID_SIZE) {
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int fd = open("/dev/urandom", O_RDONLY);
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warnx("Could not read all bytes from tag: %d", res);
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if (fd < 0) {
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goto next_tag;
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warnx("Could not open /dev/urandom");
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}
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goto next_tag;
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}
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// Print out key ID and UID
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if (RANDOM_UID_SIZE !=
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fprintf(out, "%s:", tag_uid);
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read(fd, &uid_data[0], RANDOM_UID_SIZE)) {
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for (int j = 0; j < RANDOM_UID_SIZE; j++) {
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warnx("Could not read data from /dev/random");
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fprintf(out, "%02x", data[j]);
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goto next_tag;
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}
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}
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fprintf(out, "\n");
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close(fd);
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fflush(out);
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}
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next_tag:
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// Write data
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free(tag_uid);
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res = mifare_desfire_write_data(tag, 0, 0, RANDOM_UID_SIZE,
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&uid_data[0]);
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mifare_desfire_disconnect(tag);
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if (res < 0) {
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}
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warnx("Could not write UID data to tag: %d", res);
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goto next_tag;
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}
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}
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while (freefare_selected_tag_is_present(device))
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// Authenticate with our key
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;
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res = mifare_desfire_authenticate_aes(tag, 0, key_master);
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if (res < 0) {
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freefare_free_tags(tags);
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warnx("Authentication on application failed: %d", res);
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fflush(stdout);
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goto next_tag;
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fflush(stderr);
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}
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}
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mifare_desfire_key_free(key_null);
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// Grab UID
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mifare_desfire_key_free(key_master);
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uint8_t data[RANDOM_UID_SIZE];
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res = mifare_desfire_read_data(tag, 0, 0, RANDOM_UID_SIZE, &data[0]);
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if (res != RANDOM_UID_SIZE) {
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warnx("Could not read all bytes from tag: %d", res);
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goto next_tag;
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}
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nfc_close(device);
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// Print out key ID and UID
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nfc_exit(context);
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fprintf(out, "%s:", tag_uid);
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for (int j = 0; j < RANDOM_UID_SIZE; j++) {
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fprintf(out, "%02x", data[j]);
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}
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fprintf(out, "\n");
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fflush(out);
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exit(error);
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next_tag:
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free(tag_uid);
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mifare_desfire_disconnect(tag);
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}
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while (freefare_selected_tag_is_present(device))
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;
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freefare_free_tags(tags);
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fflush(stdout);
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fflush(stderr);
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}
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mifare_desfire_key_free(key_null);
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mifare_desfire_key_free(key_master);
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nfc_close(device);
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nfc_exit(context);
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exit(error);
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}
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}
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@ -3,4 +3,3 @@
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int init(nfc_context **context, nfc_device **device);
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int init(nfc_context **context, nfc_device **device);
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void poll_target(nfc_device *device);
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void poll_target(nfc_device *device);
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