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[FL-2883] NFC: bank card rework reading (#1858)

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* nfc: remove bank card save option
* nfc: remove bank card save from nfc device
* nfc: remove unused function in emv
* nfc: try several times to start emv application
* nfc: add AID display fallback for bank cards

Co-authored-by: あく <alleteam@gmail.com>
This commit is contained in:
gornekich
2022-10-11 22:13:12 +05:00
committed by GitHub
parent 04f5ad83f8
commit 2552278a3d
6 changed files with 76 additions and 89 deletions
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34
lib/nfc/nfc_device.c
View File

@@ -636,35 +636,7 @@ bool nfc_device_load_mifare_df_data(FlipperFormat* file, NfcDevice* dev) {
return parsed;
}
static bool nfc_device_save_bank_card_data(FlipperFormat* file, NfcDevice* dev) {
bool saved = false;
EmvData* data = &dev->dev_data.emv_data;
uint32_t data_temp = 0;
do {
// Write Bank card specific data
if(!flipper_format_write_comment_cstr(file, "Bank card specific data")) break;
if(!flipper_format_write_hex(file, "AID", data->aid, data->aid_len)) break;
if(!flipper_format_write_string_cstr(file, "Name", data->name)) break;
if(!flipper_format_write_hex(file, "Number", data->number, data->number_len)) break;
if(data->exp_mon) {
uint8_t exp_data[2] = {data->exp_mon, data->exp_year};
if(!flipper_format_write_hex(file, "Exp data", exp_data, sizeof(exp_data))) break;
}
if(data->country_code) {
data_temp = data->country_code;
if(!flipper_format_write_uint32(file, "Country code", &data_temp, 1)) break;
}
if(data->currency_code) {
data_temp = data->currency_code;
if(!flipper_format_write_uint32(file, "Currency code", &data_temp, 1)) break;
}
saved = true;
} while(false);
return saved;
}
// Leave for backward compatibility
bool nfc_device_load_bank_card_data(FlipperFormat* file, NfcDevice* dev) {
bool parsed = false;
EmvData* data = &dev->dev_data.emv_data;
@@ -1068,7 +1040,7 @@ static bool nfc_device_save_file(
if(!flipper_format_write_header_cstr(file, nfc_file_header, nfc_file_version)) break;
// Write nfc device type
if(!flipper_format_write_comment_cstr(
file, "Nfc device type can be UID, Mifare Ultralight, Mifare Classic, Bank card"))
file, "Nfc device type can be UID, Mifare Ultralight, Mifare Classic"))
break;
nfc_device_prepare_format_string(dev, temp_str);
if(!flipper_format_write_string(file, "Device type", temp_str)) break;
@@ -1083,8 +1055,6 @@ static bool nfc_device_save_file(
if(!nfc_device_save_mifare_ul_data(file, dev)) break;
} else if(dev->format == NfcDeviceSaveFormatMifareDesfire) {
if(!nfc_device_save_mifare_df_data(file, dev)) break;
} else if(dev->format == NfcDeviceSaveFormatBankCard) {
if(!nfc_device_save_bank_card_data(file, dev)) break;
} else if(dev->format == NfcDeviceSaveFormatMifareClassic) {
// Save data
if(!nfc_device_save_mifare_classic_data(file, dev)) break;

62
lib/nfc/nfc_worker.c
View File

@@ -233,31 +233,51 @@ static bool nfc_worker_read_bank_card(NfcWorker* nfc_worker, FuriHalNfcTxRxConte
reader_analyzer_start(nfc_worker->reader_analyzer, ReaderAnalyzerModeDebugLog);
}
do {
// Read card
// Bank cards require strong field to start application. If we find AID, try at least several
// times to start EMV application
uint8_t start_application_attempts = 0;
while(start_application_attempts < 3) {
if(nfc_worker->state != NfcWorkerStateRead) break;
start_application_attempts++;
if(!furi_hal_nfc_detect(&nfc_worker->dev_data->nfc_data, 300)) break;
if(!emv_read_bank_card(tx_rx, &emv_app)) break;
// Copy data
// TODO Set EmvData to reader or like in mifare ultralight!
result->number_len = emv_app.card_number_len;
memcpy(result->number, emv_app.card_number, result->number_len);
if(emv_read_bank_card(tx_rx, &emv_app)) {
FURI_LOG_D(TAG, "Bank card number read from %d attempt", start_application_attempts);
break;
} else if(emv_app.aid_len && !emv_app.app_started) {
FURI_LOG_D(
TAG,
"AID found but failed to start EMV app from %d attempt",
start_application_attempts);
furi_hal_nfc_sleep();
continue;
} else {
FURI_LOG_D(TAG, "Failed to find AID");
break;
}
}
// Copy data
if(emv_app.aid_len) {
result->aid_len = emv_app.aid_len;
memcpy(result->aid, emv_app.aid, result->aid_len);
if(emv_app.name_found) {
memcpy(result->name, emv_app.name, sizeof(emv_app.name));
}
if(emv_app.exp_month) {
result->exp_mon = emv_app.exp_month;
result->exp_year = emv_app.exp_year;
}
if(emv_app.country_code) {
result->country_code = emv_app.country_code;
}
if(emv_app.currency_code) {
result->currency_code = emv_app.currency_code;
}
read_success = true;
} while(false);
}
if(emv_app.card_number_len) {
result->number_len = emv_app.card_number_len;
memcpy(result->number, emv_app.card_number, result->number_len);
}
if(emv_app.name_found) {
memcpy(result->name, emv_app.name, sizeof(emv_app.name));
}
if(emv_app.exp_month) {
result->exp_mon = emv_app.exp_month;
result->exp_year = emv_app.exp_year;
}
if(emv_app.country_code) {
result->country_code = emv_app.country_code;
}
if(emv_app.currency_code) {
result->currency_code = emv_app.currency_code;
}
if(furi_hal_rtc_is_flag_set(FuriHalRtcFlagDebug)) {
reader_analyzer_stop(nfc_worker->reader_analyzer);

18
lib/nfc/protocols/emv.c
View File

@@ -182,7 +182,7 @@ static bool emv_decode_response(uint8_t* buff, uint16_t len, EmvApplication* app
return success;
}
bool emv_select_ppse(FuriHalNfcTxRxContext* tx_rx, EmvApplication* app) {
static bool emv_select_ppse(FuriHalNfcTxRxContext* tx_rx, EmvApplication* app) {
bool app_aid_found = false;
const uint8_t emv_select_ppse_cmd[] = {
0x00, 0xA4, // SELECT ppse
@@ -212,8 +212,8 @@ bool emv_select_ppse(FuriHalNfcTxRxContext* tx_rx, EmvApplication* app) {
return app_aid_found;
}
bool emv_select_app(FuriHalNfcTxRxContext* tx_rx, EmvApplication* app) {
bool select_app_success = false;
static bool emv_select_app(FuriHalNfcTxRxContext* tx_rx, EmvApplication* app) {
app->app_started = false;
const uint8_t emv_select_header[] = {
0x00,
0xA4, // SELECT application
@@ -236,7 +236,7 @@ bool emv_select_app(FuriHalNfcTxRxContext* tx_rx, EmvApplication* app) {
if(furi_hal_nfc_tx_rx(tx_rx, 300)) {
emv_trace(tx_rx, "Start application answer:");
if(emv_decode_response(tx_rx->rx_data, tx_rx->rx_bits / 8, app)) {
select_app_success = true;
app->app_started = true;
} else {
FURI_LOG_E(TAG, "Failed to read PAN or PDOL");
}
@@ -244,7 +244,7 @@ bool emv_select_app(FuriHalNfcTxRxContext* tx_rx, EmvApplication* app) {
FURI_LOG_E(TAG, "Failed to start application");
}
return select_app_success;
return app->app_started;
}
static uint16_t emv_prepare_pdol(APDU* dest, APDU* src) {
@@ -367,14 +367,6 @@ static bool emv_read_files(FuriHalNfcTxRxContext* tx_rx, EmvApplication* app) {
return card_num_read;
}
bool emv_search_application(FuriHalNfcTxRxContext* tx_rx, EmvApplication* emv_app) {
furi_assert(tx_rx);
furi_assert(emv_app);
memset(emv_app, 0, sizeof(EmvApplication));
return emv_select_ppse(tx_rx, emv_app);
}
bool emv_read_bank_card(FuriHalNfcTxRxContext* tx_rx, EmvApplication* emv_app) {
furi_assert(tx_rx);
furi_assert(emv_app);

10
lib/nfc/protocols/emv.h
View File

@@ -45,6 +45,7 @@ typedef struct {
uint8_t priority;
uint8_t aid[16];
uint8_t aid_len;
bool app_started;
char name[32];
bool name_found;
uint8_t card_number[10];
@@ -68,15 +69,6 @@ typedef struct {
*/
bool emv_read_bank_card(FuriHalNfcTxRxContext* tx_rx, EmvApplication* emv_app);
/** Search for EMV Application
*
* @param tx_rx FuriHalNfcTxRxContext instance
* @param emv_app EmvApplication instance
*
* @return true on success
*/
bool emv_search_application(FuriHalNfcTxRxContext* tx_rx, EmvApplication* emv_app);
/** Emulate bank card
* @note Answer to application selection and PDOL
*