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Added examples/mifare-desfire-ev1-change-picc-key
Note: Work in progress. This example demonstrates how to change the PICC key for a DESFire EV1 card, while also aiming to be a generally useful tool for locking/unlocking DESFire credentials.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,252 @@ | ||
| #if defined(HAVE_CONFIG_H) | ||
| #include "config.h" | ||
| #endif | ||
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| #include <err.h> | ||
| #include <errno.h> | ||
| #include <stdlib.h> | ||
| #include <string.h> | ||
| #include <unistd.h> | ||
| #include <stdbool.h> | ||
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| #include <nfc/nfc.h> | ||
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| #include <freefare.h> | ||
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| uint8_t null_key_data[8]; | ||
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| uint8_t new_key_version = 0x00; | ||
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| MifareDESFireKey old_picc_key; | ||
| MifareDESFireKey new_picc_key; | ||
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| #define NEW_KEY_VERSION new_key_version | ||
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| struct { | ||
| bool interactive; | ||
| } configure_options = { | ||
| .interactive = true | ||
| }; | ||
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| static void | ||
| usage(char *progname) | ||
| { | ||
| fprintf(stderr, "usage: %s [-y]\n", progname); | ||
| fprintf(stderr, "\nOptions:\n"); | ||
| fprintf(stderr, " -y Do not ask for confirmation\n"); | ||
| fprintf(stderr, " -k Existing PICC key (Default is all zeros)\n"); | ||
| fprintf(stderr, " -n New PICC key (Default is all zeros)\n"); | ||
| fprintf(stderr, " -v New PICC key version (default is zero)\n"); | ||
| } | ||
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| #define strnequal(x, y, n) (strncmp(x, y, n) == 0) | ||
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| static inline bool | ||
| strhasprefix(const char* str, const char* prefix) | ||
| { | ||
| return strnequal(str, prefix, strlen(prefix)); | ||
| } | ||
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||
| MifareDESFireKey read_hex_desfire_key(const char* optarg) | ||
| { | ||
| uint8_t buffer[24]; | ||
| int i; | ||
| uint64_t n; | ||
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| bool is_des = true; | ||
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| if (strhasprefix(optarg, "DES:")) { | ||
| is_des = true; | ||
| optarg += 4; | ||
| } else if (strhasprefix(optarg, "AES:")) { | ||
| is_des = false; | ||
| optarg += 4; | ||
| } | ||
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| size_t len = strlen(optarg); | ||
| size_t div16 = len / 16; | ||
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| if (div16 < 1 || div16 > 3 || (len % 16) != 0) { | ||
| fprintf(stderr,"Bad key length\n"); | ||
| exit(EXIT_FAILURE); | ||
| } | ||
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| if (div16 >= 1) { | ||
| n = strtoull(optarg, NULL, 16); | ||
| for (i = 7; i >= 0; i--) { | ||
| buffer[i] = (uint8_t) n; | ||
| n >>= 8; | ||
| } | ||
| } | ||
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| if (div16 >= 2) { | ||
| n = strtoull(optarg+8, NULL, 16); | ||
| for (i = 7; i >= 0; i--) { | ||
| buffer[i+8] = (uint8_t) n; | ||
| n >>= 8; | ||
| } | ||
| } | ||
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| if (div16 == 3) { | ||
| n = strtoull(optarg+16, NULL, 16); | ||
| for (i = 7; i >= 0; i--) { | ||
| buffer[i+16] = (uint8_t) n; | ||
| n >>= 8; | ||
| } | ||
| } | ||
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| if (is_des && div16 == 1) { | ||
| return mifare_desfire_des_key_new(buffer); | ||
| } | ||
| if (is_des && div16 == 2) { | ||
| return mifare_desfire_3des_key_new(buffer); | ||
| } | ||
| if (is_des && div16 == 3) { | ||
| return mifare_desfire_3k3des_key_new(buffer); | ||
| } | ||
| if (!is_des && div16 == 2) { | ||
| return mifare_desfire_aes_key_new(buffer); | ||
| } | ||
| fprintf(stderr,"Bad key length\n"); | ||
| exit(EXIT_FAILURE); | ||
| } | ||
|
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| int | ||
| main(int argc, char *argv[]) | ||
| { | ||
| int ch; | ||
| int error = EXIT_SUCCESS; | ||
| nfc_device *device = NULL; | ||
| FreefareTag *tags = NULL; | ||
| bool should_diversify_new = false; | ||
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| old_picc_key = mifare_desfire_des_key_new(null_key_data); | ||
| new_picc_key = mifare_desfire_des_key_new(null_key_data); | ||
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| while ((ch = getopt(argc, argv, "hyk:n:v:D")) != -1) { | ||
| switch (ch) { | ||
| case 'h': | ||
| usage(argv[0]); | ||
| exit(EXIT_SUCCESS); | ||
| break; | ||
| case 'y': | ||
| configure_options.interactive = false; | ||
| break; | ||
| case 'k': | ||
| mifare_desfire_key_free(old_picc_key); | ||
| old_picc_key = read_hex_desfire_key(optarg); | ||
| break; | ||
| case 'n': | ||
| mifare_desfire_key_free(new_picc_key); | ||
| new_picc_key = read_hex_desfire_key(optarg); | ||
| break; | ||
| case 'v': | ||
| errno = 0; | ||
| new_key_version = (uint8_t)strtol(optarg, NULL, 0); | ||
| if (errno != 0) { | ||
| perror("strtol"); | ||
| exit(EXIT_FAILURE); | ||
| } | ||
| break; | ||
| case 'D': | ||
| should_diversify_new = true; | ||
| break; | ||
| default: | ||
| usage(argv[0]); | ||
| exit(EXIT_FAILURE); | ||
| } | ||
| } | ||
| // Remaining args, if any, are in argv[optind .. (argc-1)] | ||
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| mifare_desfire_key_set_version(new_picc_key, new_key_version); | ||
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| MifareKeyDeriver new_deriver = NULL; | ||
| if (should_diversify_new) { | ||
| new_deriver = mifare_key_deriver_new_an10922(new_picc_key, mifare_desfire_key_get_type(new_picc_key), AN10922_FLAG_DEFAULT); | ||
| } | ||
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| nfc_connstring devices[8]; | ||
| size_t device_count; | ||
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| nfc_context *context; | ||
| nfc_init(&context); | ||
| if (context == NULL) | ||
| errx(EXIT_FAILURE, "Unable to init libnfc (malloc)"); | ||
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| device_count = nfc_list_devices(context, devices, 8); | ||
| if (device_count <= 0) | ||
| errx(EXIT_FAILURE, "No NFC device found."); | ||
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| for (size_t d = 0; (!error) && (d < device_count); d++) { | ||
| device = nfc_open(context, devices[d]); | ||
| if (!device) { | ||
| warnx("nfc_open() failed."); | ||
| error = EXIT_FAILURE; | ||
| continue; | ||
| } | ||
|
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| tags = freefare_get_tags(device); | ||
| if (!tags) { | ||
| nfc_close(device); | ||
| errx(EXIT_FAILURE, "Error listing Mifare DESFire tags."); | ||
| } | ||
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| for (int i = 0; (!error) && tags[i]; i++) { | ||
| if (MIFARE_DESFIRE != freefare_get_tag_type(tags[i])) | ||
| continue; | ||
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| char *tag_uid = freefare_get_tag_uid(tags[i]); | ||
| char buffer[BUFSIZ]; | ||
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| int res; | ||
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| res = mifare_desfire_connect(tags[i]); | ||
| if (res < 0) { | ||
| warnx("Can't connect to Mifare DESFire target."); | ||
| error = EXIT_FAILURE; | ||
| break; | ||
| } | ||
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| printf("Found %s with UID %s. ", freefare_get_tag_friendly_name(tags[i]), tag_uid); | ||
| bool do_it = true; | ||
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| if (configure_options.interactive) { | ||
| printf("Change PICC key? [yN] "); | ||
| fgets(buffer, BUFSIZ, stdin); | ||
| do_it = ((buffer[0] == 'y') || (buffer[0] == 'Y')); | ||
| } else { | ||
| printf("\n"); | ||
| } | ||
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| if (do_it) { | ||
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| res = mifare_desfire_authenticate(tags[i], 0, old_picc_key); | ||
| if (res < 0) { | ||
| freefare_perror(tags[i], "mifare_desfire_authenticate"); | ||
| error = EXIT_FAILURE; | ||
| break; | ||
| } | ||
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| res = mifare_desfire_change_key(tags[i], 0, new_picc_key, old_picc_key); | ||
| if (res < 0) { | ||
| freefare_perror(tags[i], "mifare_desfire_change_key"); | ||
| error = EXIT_FAILURE; | ||
| break; | ||
| } | ||
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| } | ||
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| mifare_desfire_disconnect(tags[i]); | ||
| free(tag_uid); | ||
| } | ||
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| freefare_free_tags(tags); | ||
| nfc_close(device); | ||
| } | ||
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| mifare_desfire_key_free(old_picc_key); | ||
| mifare_desfire_key_free(new_picc_key); | ||
|
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| nfc_exit(context); | ||
| exit(error); | ||
| } |
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