flipperzero-firmware/applications/plugins/picopass/picopass_device.c

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#include "picopass_device.h"
#include <toolbox/path.h>
#include <flipper_format/flipper_format.h>
#define TAG "PicopassDevice"
static const char* picopass_file_header = "Flipper Picopass device";
static const uint32_t picopass_file_version = 1;
const uint8_t picopass_iclass_decryptionkey[] =
{0xb4, 0x21, 0x2c, 0xca, 0xb7, 0xed, 0x21, 0x0f, 0x7b, 0x93, 0xd4, 0x59, 0x39, 0xc7, 0xdd, 0x36};
PicopassDevice* picopass_device_alloc() {
PicopassDevice* picopass_dev = malloc(sizeof(PicopassDevice));
picopass_dev->dev_data.pacs.legacy = false;
picopass_dev->dev_data.pacs.se_enabled = false;
picopass_dev->dev_data.pacs.pin_length = 0;
picopass_dev->storage = furi_record_open(RECORD_STORAGE);
picopass_dev->dialogs = furi_record_open(RECORD_DIALOGS);
string_init(picopass_dev->load_path);
return picopass_dev;
}
void picopass_device_set_name(PicopassDevice* dev, const char* name) {
furi_assert(dev);
strlcpy(dev->dev_name, name, PICOPASS_DEV_NAME_MAX_LEN);
}
static bool picopass_device_save_file(
PicopassDevice* dev,
const char* dev_name,
const char* folder,
const char* extension,
bool use_load_path) {
furi_assert(dev);
bool saved = false;
FlipperFormat* file = flipper_format_file_alloc(dev->storage);
PicopassPacs* pacs = &dev->dev_data.pacs;
PicopassBlock* AA1 = dev->dev_data.AA1;
string_t temp_str;
string_init(temp_str);
do {
if(use_load_path && !string_empty_p(dev->load_path)) {
// Get directory name
path_extract_dirname(string_get_cstr(dev->load_path), temp_str);
// Create picopass directory if necessary
if(!storage_simply_mkdir(dev->storage, string_get_cstr(temp_str))) break;
// Make path to file to save
string_cat_printf(temp_str, "/%s%s", dev_name, extension);
} else {
// Create picopass directory if necessary
if(!storage_simply_mkdir(dev->storage, PICOPASS_APP_FOLDER)) break;
// First remove picopass device file if it was saved
string_printf(temp_str, "%s/%s%s", folder, dev_name, extension);
}
// Open file
if(!flipper_format_file_open_always(file, string_get_cstr(temp_str))) break;
if(dev->format == PicopassDeviceSaveFormatHF) {
uint32_t fc = pacs->record.FacilityCode;
uint32_t cn = pacs->record.CardNumber;
// Write header
if(!flipper_format_write_header_cstr(file, picopass_file_header, picopass_file_version))
break;
if(pacs->record.valid) {
if(!flipper_format_write_uint32(file, "Facility Code", &fc, 1)) break;
if(!flipper_format_write_uint32(file, "Card Number", &cn, 1)) break;
if(!flipper_format_write_hex(
file, "Credential", pacs->credential, PICOPASS_BLOCK_LEN))
break;
if(pacs->pin_length > 0) {
if(!flipper_format_write_hex(file, "PIN\t\t", pacs->pin0, PICOPASS_BLOCK_LEN))
break;
if(!flipper_format_write_hex(
file, "PIN(cont.)\t", pacs->pin1, PICOPASS_BLOCK_LEN))
break;
}
}
if(!flipper_format_write_comment_cstr(file, "Picopass blocks")) break;
bool block_saved = true;
size_t app_limit = AA1[PICOPASS_CONFIG_BLOCK_INDEX].data[0] < PICOPASS_MAX_APP_LIMIT ?
AA1[PICOPASS_CONFIG_BLOCK_INDEX].data[0] :
PICOPASS_MAX_APP_LIMIT;
for(size_t i = 0; i < app_limit; i++) {
string_printf(temp_str, "Block %d", i);
if(!flipper_format_write_hex(
file, string_get_cstr(temp_str), AA1[i].data, PICOPASS_BLOCK_LEN)) {
block_saved = false;
break;
}
}
if(!block_saved) break;
} else if(dev->format == PicopassDeviceSaveFormatLF) {
const char* lf_header = "Flipper RFID key";
// Write header
if(!flipper_format_write_header_cstr(file, lf_header, 1)) break;
if(!flipper_format_write_comment_cstr(
file,
"This was generated from the Picopass plugin and may not match current lfrfid"))
break;
// When lfrfid supports more formats, update this
if(!flipper_format_write_string_cstr(file, "Key type", "H10301")) break;
uint8_t H10301[3] = {0};
H10301[0] = pacs->record.FacilityCode;
H10301[1] = pacs->record.CardNumber >> 8;
H10301[2] = pacs->record.CardNumber & 0x00FF;
if(!flipper_format_write_hex(file, "Data", H10301, 3)) break;
}
saved = true;
} while(0);
if(!saved) {
dialog_message_show_storage_error(dev->dialogs, "Can not save\nfile");
}
string_clear(temp_str);
flipper_format_free(file);
return saved;
}
bool picopass_device_save(PicopassDevice* dev, const char* dev_name) {
if(dev->format == PicopassDeviceSaveFormatHF) {
return picopass_device_save_file(
dev, dev_name, PICOPASS_APP_FOLDER, PICOPASS_APP_EXTENSION, true);
} else if(dev->format == PicopassDeviceSaveFormatLF) {
return picopass_device_save_file(dev, dev_name, ANY_PATH("lfrfid"), ".rfid", true);
}
return false;
}
static bool picopass_device_load_data(PicopassDevice* dev, string_t path, bool show_dialog) {
bool parsed = false;
FlipperFormat* file = flipper_format_file_alloc(dev->storage);
PicopassBlock* AA1 = dev->dev_data.AA1;
PicopassPacs* pacs = &dev->dev_data.pacs;
string_t temp_str;
string_init(temp_str);
bool deprecated_version = false;
if(dev->loading_cb) {
dev->loading_cb(dev->loading_cb_ctx, true);
}
do {
if(!flipper_format_file_open_existing(file, string_get_cstr(path))) break;
// Read and verify file header
uint32_t version = 0;
if(!flipper_format_read_header(file, temp_str, &version)) break;
if(string_cmp_str(temp_str, picopass_file_header) || (version != picopass_file_version)) {
deprecated_version = true;
break;
}
// Parse header blocks
bool block_read = true;
for(size_t i = 0; i < 6; i++) {
string_printf(temp_str, "Block %d", i);
if(!flipper_format_read_hex(
file, string_get_cstr(temp_str), AA1[i].data, PICOPASS_BLOCK_LEN)) {
block_read = false;
break;
}
}
size_t app_limit = AA1[PICOPASS_CONFIG_BLOCK_INDEX].data[0];
for(size_t i = 6; i < app_limit; i++) {
string_printf(temp_str, "Block %d", i);
if(!flipper_format_read_hex(
file, string_get_cstr(temp_str), AA1[i].data, PICOPASS_BLOCK_LEN)) {
block_read = false;
break;
}
}
if(!block_read) break;
if(picopass_device_parse_credential(AA1, pacs) != ERR_NONE) break;
if(picopass_device_parse_wiegand(pacs->credential, &pacs->record) != ERR_NONE) break;
parsed = true;
} while(false);
if(dev->loading_cb) {
dev->loading_cb(dev->loading_cb_ctx, false);
}
if((!parsed) && (show_dialog)) {
if(deprecated_version) {
dialog_message_show_storage_error(dev->dialogs, "File format deprecated");
} else {
dialog_message_show_storage_error(dev->dialogs, "Can not parse\nfile");
}
}
string_clear(temp_str);
flipper_format_free(file);
return parsed;
}
void picopass_device_clear(PicopassDevice* dev) {
furi_assert(dev);
picopass_device_data_clear(&dev->dev_data);
memset(&dev->dev_data, 0, sizeof(dev->dev_data));
dev->format = PicopassDeviceSaveFormatHF;
string_reset(dev->load_path);
}
void picopass_device_free(PicopassDevice* picopass_dev) {
furi_assert(picopass_dev);
picopass_device_clear(picopass_dev);
furi_record_close(RECORD_STORAGE);
furi_record_close(RECORD_DIALOGS);
string_clear(picopass_dev->load_path);
free(picopass_dev);
}
bool picopass_file_select(PicopassDevice* dev) {
furi_assert(dev);
// Input events and views are managed by file_browser
string_t picopass_app_folder;
string_init_set_str(picopass_app_folder, PICOPASS_APP_FOLDER);
DialogsFileBrowserOptions browser_options;
dialog_file_browser_set_basic_options(&browser_options, PICOPASS_APP_EXTENSION, &I_Nfc_10px);
bool res = dialog_file_browser_show(
dev->dialogs, dev->load_path, picopass_app_folder, &browser_options);
string_clear(picopass_app_folder);
if(res) {
string_t filename;
string_init(filename);
path_extract_filename(dev->load_path, filename, true);
strncpy(dev->dev_name, string_get_cstr(filename), PICOPASS_DEV_NAME_MAX_LEN);
res = picopass_device_load_data(dev, dev->load_path, true);
if(res) {
picopass_device_set_name(dev, dev->dev_name);
}
string_clear(filename);
}
return res;
}
void picopass_device_data_clear(PicopassDeviceData* dev_data) {
for(size_t i = 0; i < PICOPASS_MAX_APP_LIMIT; i++) {
memset(dev_data->AA1[i].data, 0, sizeof(dev_data->AA1[i].data));
}
dev_data->pacs.legacy = false;
dev_data->pacs.se_enabled = false;
dev_data->pacs.pin_length = 0;
}
bool picopass_device_delete(PicopassDevice* dev, bool use_load_path) {
furi_assert(dev);
bool deleted = false;
string_t file_path;
string_init(file_path);
do {
// Delete original file
if(use_load_path && !string_empty_p(dev->load_path)) {
string_set(file_path, dev->load_path);
} else {
string_printf(
file_path, "%s/%s%s", PICOPASS_APP_FOLDER, dev->dev_name, PICOPASS_APP_EXTENSION);
}
if(!storage_simply_remove(dev->storage, string_get_cstr(file_path))) break;
deleted = true;
} while(0);
if(!deleted) {
dialog_message_show_storage_error(dev->dialogs, "Can not remove file");
}
string_clear(file_path);
return deleted;
}
void picopass_device_set_loading_callback(
PicopassDevice* dev,
PicopassLoadingCallback callback,
void* context) {
furi_assert(dev);
dev->loading_cb = callback;
dev->loading_cb_ctx = context;
}
ReturnCode picopass_device_decrypt(uint8_t* enc_data, uint8_t* dec_data) {
uint8_t key[32] = {0};
memcpy(key, picopass_iclass_decryptionkey, sizeof(picopass_iclass_decryptionkey));
mbedtls_des3_context ctx;
mbedtls_des3_init(&ctx);
mbedtls_des3_set2key_dec(&ctx, key);
mbedtls_des3_crypt_ecb(&ctx, enc_data, dec_data);
mbedtls_des3_free(&ctx);
return ERR_NONE;
}
ReturnCode picopass_device_parse_credential(PicopassBlock* AA1, PicopassPacs* pacs) {
ReturnCode err;
// Thank you proxmark!
pacs->legacy = (memcmp(AA1[5].data, "\xff\xff\xff\xff\xff\xff\xff\xff", 8) == 0);
pacs->se_enabled = (memcmp(AA1[5].data, "\xff\xff\xff\x00\x06\xff\xff\xff", 8) == 0);
pacs->biometrics = AA1[6].data[4];
pacs->pin_length = AA1[6].data[6] & 0x0F;
pacs->encryption = AA1[6].data[7];
if(pacs->encryption == PicopassDeviceEncryption3DES) {
FURI_LOG_D(TAG, "3DES Encrypted");
err = picopass_device_decrypt(AA1[7].data, pacs->credential);
if(err != ERR_NONE) {
FURI_LOG_E(TAG, "decrypt error %d", err);
return err;
}
err = picopass_device_decrypt(AA1[8].data, pacs->pin0);
if(err != ERR_NONE) {
FURI_LOG_E(TAG, "decrypt error %d", err);
return err;
}
err = picopass_device_decrypt(AA1[9].data, pacs->pin1);
if(err != ERR_NONE) {
FURI_LOG_E(TAG, "decrypt error %d", err);
return err;
}
} else if(pacs->encryption == PicopassDeviceEncryptionNone) {
FURI_LOG_D(TAG, "No Encryption");
memcpy(pacs->credential, AA1[7].data, PICOPASS_BLOCK_LEN);
memcpy(pacs->pin0, AA1[8].data, PICOPASS_BLOCK_LEN);
memcpy(pacs->pin1, AA1[9].data, PICOPASS_BLOCK_LEN);
} else if(pacs->encryption == PicopassDeviceEncryptionDES) {
FURI_LOG_D(TAG, "DES Encrypted");
} else {
FURI_LOG_D(TAG, "Unknown encryption");
}
return ERR_NONE;
}
ReturnCode picopass_device_parse_wiegand(uint8_t* data, PicopassWiegandRecord* record) {
uint32_t* halves = (uint32_t*)data;
if(halves[0] == 0) {
uint8_t leading0s = __builtin_clz(REVERSE_BYTES_U32(halves[1]));
record->bitLength = 31 - leading0s;
} else {
uint8_t leading0s = __builtin_clz(REVERSE_BYTES_U32(halves[0]));
record->bitLength = 63 - leading0s;
}
FURI_LOG_D(TAG, "bitLength: %d", record->bitLength);
if(record->bitLength == 26) {
uint8_t* v4 = data + 4;
uint32_t bot = v4[3] | (v4[2] << 8) | (v4[1] << 16) | (v4[0] << 24);
record->CardNumber = (bot >> 1) & 0xFFFF;
record->FacilityCode = (bot >> 17) & 0xFF;
FURI_LOG_D(TAG, "FC:%u CN: %u\n", record->FacilityCode, record->CardNumber);
record->valid = true;
} else {
record->CardNumber = 0;
record->FacilityCode = 0;
record->valid = false;
}
return ERR_NONE;
}