0b0ca597ea
* Rework NFC EMV response parsing. Split TLV and tags per EMV spec. * Requested changes: fb -> first_byte and missed printf to FURI_LOG_T Co-authored-by: Gary <gary@x1z.net> Co-authored-by: gornekich <n.gorbadey@gmail.com>
429 lines
16 KiB
C
429 lines
16 KiB
C
#include "emv.h"
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#include <furi/common_defines.h>
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#define TAG "Emv"
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const PDOLValue pdol_term_info = {0x9F59, {0xC8, 0x80, 0x00}}; // Terminal transaction information
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const PDOLValue pdol_term_type = {0x9F5A, {0x00}}; // Terminal transaction type
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const PDOLValue pdol_merchant_type = {0x9F58, {0x01}}; // Merchant type indicator
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const PDOLValue pdol_term_trans_qualifies = {
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0x9F66,
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{0x79, 0x00, 0x40, 0x80}}; // Terminal transaction qualifiers
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const PDOLValue pdol_addtnl_term_qualifies = {
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0x9F40,
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{0x79, 0x00, 0x40, 0x80}}; // Terminal transaction qualifiers
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const PDOLValue pdol_amount_authorise = {
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0x9F02,
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{0x00, 0x00, 0x00, 0x10, 0x00, 0x00}}; // Amount, authorised
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const PDOLValue pdol_amount = {0x9F03, {0x00, 0x00, 0x00, 0x00, 0x00, 0x00}}; // Amount
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const PDOLValue pdol_country_code = {0x9F1A, {0x01, 0x24}}; // Terminal country code
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const PDOLValue pdol_currency_code = {0x5F2A, {0x01, 0x24}}; // Transaction currency code
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const PDOLValue pdol_term_verification = {
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0x95,
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{0x00, 0x00, 0x00, 0x00, 0x00}}; // Terminal verification results
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const PDOLValue pdol_transaction_date = {0x9A, {0x19, 0x01, 0x01}}; // Transaction date
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const PDOLValue pdol_transaction_type = {0x9C, {0x00}}; // Transaction type
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const PDOLValue pdol_transaction_cert = {0x98, {0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0}}; // Transaction cert
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const PDOLValue pdol_unpredict_number = {0x9F37, {0x82, 0x3D, 0xDE, 0x7A}}; // Unpredictable number
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const PDOLValue* const pdol_values[] = {
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&pdol_term_info,
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&pdol_term_type,
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&pdol_merchant_type,
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&pdol_term_trans_qualifies,
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&pdol_addtnl_term_qualifies,
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&pdol_amount_authorise,
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&pdol_amount,
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&pdol_country_code,
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&pdol_currency_code,
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&pdol_term_verification,
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&pdol_transaction_date,
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&pdol_transaction_type,
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&pdol_transaction_cert,
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&pdol_unpredict_number,
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};
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static const uint8_t select_ppse_ans[] = {0x6F, 0x29, 0x84, 0x0E, 0x32, 0x50, 0x41, 0x59, 0x2E,
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0x53, 0x59, 0x53, 0x2E, 0x44, 0x44, 0x46, 0x30, 0x31,
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0xA5, 0x17, 0xBF, 0x0C, 0x14, 0x61, 0x12, 0x4F, 0x07,
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0xA0, 0x00, 0x00, 0x00, 0x03, 0x10, 0x10, 0x50, 0x04,
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0x56, 0x49, 0x53, 0x41, 0x87, 0x01, 0x01, 0x90, 0x00};
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static const uint8_t select_app_ans[] = {0x6F, 0x20, 0x84, 0x07, 0xA0, 0x00, 0x00, 0x00, 0x03,
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0x10, 0x10, 0xA5, 0x15, 0x50, 0x04, 0x56, 0x49, 0x53,
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0x41, 0x9F, 0x38, 0x0C, 0x9F, 0x66, 0x04, 0x9F, 0x02,
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0x06, 0x9F, 0x37, 0x04, 0x5F, 0x2A, 0x02, 0x90, 0x00};
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static const uint8_t pdol_ans[] = {0x77, 0x40, 0x82, 0x02, 0x20, 0x00, 0x57, 0x13, 0x55, 0x70,
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0x73, 0x83, 0x85, 0x87, 0x73, 0x31, 0xD1, 0x80, 0x22, 0x01,
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0x38, 0x84, 0x77, 0x94, 0x00, 0x00, 0x1F, 0x5F, 0x34, 0x01,
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0x00, 0x9F, 0x10, 0x07, 0x06, 0x01, 0x11, 0x03, 0x80, 0x00,
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0x00, 0x9F, 0x26, 0x08, 0x7A, 0x65, 0x7F, 0xD3, 0x52, 0x96,
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0xC9, 0x85, 0x9F, 0x27, 0x01, 0x00, 0x9F, 0x36, 0x02, 0x06,
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0x0C, 0x9F, 0x6C, 0x02, 0x10, 0x00, 0x90, 0x00};
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static void emv_trace(FuriHalNfcTxRxContext* tx_rx, const char* message) {
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if(furi_log_get_level() == FuriLogLevelTrace) {
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FURI_LOG_T(TAG, "%s", message);
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printf("TX: ");
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for(size_t i = 0; i < tx_rx->tx_bits / 8; i++) {
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printf("%02X ", tx_rx->tx_data[i]);
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}
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printf("\r\nRX: ");
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for(size_t i = 0; i < tx_rx->rx_bits / 8; i++) {
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printf("%02X ", tx_rx->rx_data[i]);
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}
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printf("\r\n");
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}
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}
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static bool emv_decode_response(uint8_t* buff, uint16_t len, EmvApplication* app) {
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uint16_t i = 0;
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uint16_t tag = 0, first_byte = 0;
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uint16_t tlen = 0;
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bool success = false;
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while(i < len) {
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first_byte = buff[i];
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if((first_byte & 31) == 31) { // 2-byte tag
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tag = buff[i] << 8 | buff[i + 1];
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i++;
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FURI_LOG_T(TAG, " 2-byte TLV EMV tag: %x", tag);
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} else {
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tag = buff[i];
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FURI_LOG_T(TAG, " 1-byte TLV EMV tag: %x", tag);
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}
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i++;
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tlen = buff[i];
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if((tlen & 128) == 128) { // long length value
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i++;
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tlen = buff[i];
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FURI_LOG_T(TAG, " 2-byte TLV length: %d", tlen);
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} else {
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FURI_LOG_T(TAG, " 1-byte TLV length: %d", tlen);
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}
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i++;
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if((first_byte & 32) == 32) { // "Constructed" -- contains more TLV data to parse
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FURI_LOG_T(TAG, "Constructed TLV %x", tag);
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if(!emv_decode_response(&buff[i], tlen, app)) {
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FURI_LOG_T(TAG, "Failed to decode response for %x", tag);
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// return false;
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} else {
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success = true;
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}
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} else {
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switch(tag) {
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case EMV_TAG_AID:
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app->aid_len = tlen;
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memcpy(app->aid, &buff[i], tlen);
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success = true;
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FURI_LOG_T(TAG, "found EMV_TAG_AID %x", tag);
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break;
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case EMV_TAG_PRIORITY:
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memcpy(&app->priority, &buff[i], tlen);
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success = true;
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break;
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case EMV_TAG_CARD_NAME:
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memcpy(app->name, &buff[i], tlen);
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app->name[tlen] = '\0';
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app->name_found = true;
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success = true;
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FURI_LOG_T(TAG, "found EMV_TAG_CARD_NAME %x : %s", tag, app->name);
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break;
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case EMV_TAG_PDOL:
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memcpy(app->pdol.data, &buff[i], tlen);
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app->pdol.size = tlen;
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success = true;
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FURI_LOG_T(TAG, "found EMV_TAG_PDOL %x (len=%d)", tag, tlen);
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break;
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case EMV_TAG_AFL:
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memcpy(app->afl.data, &buff[i], tlen);
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app->afl.size = tlen;
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success = true;
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FURI_LOG_T(TAG, "found EMV_TAG_AFL %x (len=%d)", tag, tlen);
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break;
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case EMV_TAG_CARD_NUM: // Track 2 Equivalent Data. 0xD0 delimits PAN from expiry (YYMM)
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for(int x = 1; x < tlen; x++) {
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if(buff[i + x + 1] > 0xD0) {
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memcpy(app->card_number, &buff[i], x + 1);
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app->card_number_len = x + 1;
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break;
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}
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}
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success = true;
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FURI_LOG_T(
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TAG,
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"found EMV_TAG_CARD_NUM %x (len=%d)",
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EMV_TAG_CARD_NUM,
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app->card_number_len);
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break;
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case EMV_TAG_PAN:
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memcpy(app->card_number, &buff[i], tlen);
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app->card_number_len = tlen;
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success = true;
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break;
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case EMV_TAG_EXP_DATE:
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app->exp_year = buff[i];
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app->exp_month = buff[i + 1];
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success = true;
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break;
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case EMV_TAG_CURRENCY_CODE:
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app->currency_code = (buff[i] << 8 | buff[i + 1]);
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success = true;
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break;
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case EMV_TAG_COUNTRY_CODE:
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app->country_code = (buff[i] << 8 | buff[i + 1]);
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success = true;
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break;
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}
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}
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i += tlen;
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}
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return success;
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}
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bool emv_select_ppse(FuriHalNfcTxRxContext* tx_rx, EmvApplication* app) {
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bool app_aid_found = false;
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const uint8_t emv_select_ppse_cmd[] = {
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0x00, 0xA4, // SELECT ppse
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0x04, 0x00, // P1:By name, P2: empty
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0x0e, // Lc: Data length
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0x32, 0x50, 0x41, 0x59, 0x2e, 0x53, 0x59, // Data string:
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0x53, 0x2e, 0x44, 0x44, 0x46, 0x30, 0x31, // 2PAY.SYS.DDF01 (PPSE)
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0x00 // Le
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};
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memcpy(tx_rx->tx_data, emv_select_ppse_cmd, sizeof(emv_select_ppse_cmd));
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tx_rx->tx_bits = sizeof(emv_select_ppse_cmd) * 8;
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tx_rx->tx_rx_type = FuriHalNfcTxRxTypeDefault;
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FURI_LOG_D(TAG, "Send select PPSE");
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if(furi_hal_nfc_tx_rx(tx_rx, 300)) {
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emv_trace(tx_rx, "Select PPSE answer:");
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if(emv_decode_response(tx_rx->rx_data, tx_rx->rx_bits / 8, app)) {
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app_aid_found = true;
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} else {
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FURI_LOG_E(TAG, "Failed to parse application");
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}
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} else {
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FURI_LOG_E(TAG, "Failed select PPSE");
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}
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return app_aid_found;
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}
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bool emv_select_app(FuriHalNfcTxRxContext* tx_rx, EmvApplication* app) {
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bool select_app_success = false;
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const uint8_t emv_select_header[] = {
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0x00,
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0xA4, // SELECT application
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0x04,
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0x00 // P1:By name, P2:First or only occurence
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};
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uint16_t size = sizeof(emv_select_header);
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// Copy header
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memcpy(tx_rx->tx_data, emv_select_header, size);
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// Copy AID
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tx_rx->tx_data[size++] = app->aid_len;
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memcpy(&tx_rx->tx_data[size], app->aid, app->aid_len);
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size += app->aid_len;
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tx_rx->tx_data[size++] = 0x00;
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tx_rx->tx_bits = size * 8;
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tx_rx->tx_rx_type = FuriHalNfcTxRxTypeDefault;
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FURI_LOG_D(TAG, "Start application");
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if(furi_hal_nfc_tx_rx(tx_rx, 300)) {
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emv_trace(tx_rx, "Start application answer:");
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if(emv_decode_response(tx_rx->rx_data, tx_rx->rx_bits / 8, app)) {
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select_app_success = true;
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} else {
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FURI_LOG_E(TAG, "Failed to read PAN or PDOL");
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}
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} else {
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FURI_LOG_E(TAG, "Failed to start application");
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}
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return select_app_success;
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}
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static uint16_t emv_prepare_pdol(APDU* dest, APDU* src) {
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bool tag_found;
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for(uint16_t i = 0; i < src->size; i++) {
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tag_found = false;
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for(uint8_t j = 0; j < sizeof(pdol_values) / sizeof(PDOLValue*); j++) {
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if(src->data[i] == pdol_values[j]->tag) {
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// Found tag with 1 byte length
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uint8_t len = src->data[++i];
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memcpy(dest->data + dest->size, pdol_values[j]->data, len);
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dest->size += len;
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tag_found = true;
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break;
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} else if(((src->data[i] << 8) | src->data[i + 1]) == pdol_values[j]->tag) {
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// Found tag with 2 byte length
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i += 2;
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uint8_t len = src->data[i];
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memcpy(dest->data + dest->size, pdol_values[j]->data, len);
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dest->size += len;
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tag_found = true;
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break;
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}
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}
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if(!tag_found) {
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// Unknown tag, fill zeros
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i += 2;
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uint8_t len = src->data[i];
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memset(dest->data + dest->size, 0, len);
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dest->size += len;
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}
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}
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return dest->size;
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}
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static bool emv_get_processing_options(FuriHalNfcTxRxContext* tx_rx, EmvApplication* app) {
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bool card_num_read = false;
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const uint8_t emv_gpo_header[] = {0x80, 0xA8, 0x00, 0x00};
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uint16_t size = sizeof(emv_gpo_header);
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// Copy header
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memcpy(tx_rx->tx_data, emv_gpo_header, size);
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APDU pdol_data = {0, {0}};
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// Prepare and copy pdol parameters
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emv_prepare_pdol(&pdol_data, &app->pdol);
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tx_rx->tx_data[size++] = 0x02 + pdol_data.size;
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tx_rx->tx_data[size++] = 0x83;
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tx_rx->tx_data[size++] = pdol_data.size;
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memcpy(tx_rx->tx_data + size, pdol_data.data, pdol_data.size);
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size += pdol_data.size;
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tx_rx->tx_data[size++] = 0;
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tx_rx->tx_bits = size * 8;
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tx_rx->tx_rx_type = FuriHalNfcTxRxTypeDefault;
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FURI_LOG_D(TAG, "Get proccessing options");
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if(furi_hal_nfc_tx_rx(tx_rx, 300)) {
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emv_trace(tx_rx, "Get processing options answer:");
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if(emv_decode_response(tx_rx->rx_data, tx_rx->rx_bits / 8, app)) {
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if(app->card_number_len > 0) {
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card_num_read = true;
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}
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}
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} else {
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FURI_LOG_E(TAG, "Failed to get processing options");
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}
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return card_num_read;
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}
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static bool emv_read_sfi_record(
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FuriHalNfcTxRxContext* tx_rx,
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EmvApplication* app,
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uint8_t sfi,
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uint8_t record_num) {
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bool card_num_read = false;
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uint8_t sfi_param = (sfi << 3) | (1 << 2);
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uint8_t emv_sfi_header[] = {
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0x00,
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0xB2, // READ RECORD
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record_num, // P1:record_number
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sfi_param, // P2:SFI
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0x00 // Le
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};
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memcpy(tx_rx->tx_data, emv_sfi_header, sizeof(emv_sfi_header));
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tx_rx->tx_bits = sizeof(emv_sfi_header) * 8;
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tx_rx->tx_rx_type = FuriHalNfcTxRxTypeDefault;
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if(furi_hal_nfc_tx_rx(tx_rx, 300)) {
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emv_trace(tx_rx, "SFI record:");
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if(emv_decode_response(tx_rx->rx_data, tx_rx->rx_bits / 8, app)) {
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card_num_read = true;
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}
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} else {
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FURI_LOG_E(TAG, "Failed to read SFI record %d", record_num);
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}
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return card_num_read;
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}
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static bool emv_read_files(FuriHalNfcTxRxContext* tx_rx, EmvApplication* app) {
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bool card_num_read = false;
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if(app->afl.size == 0) {
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return false;
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}
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FURI_LOG_D(TAG, "Search PAN in SFI");
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// Iterate through all files
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for(size_t i = 0; i < app->afl.size; i += 4) {
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uint8_t sfi = app->afl.data[i] >> 3;
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uint8_t record_start = app->afl.data[i + 1];
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uint8_t record_end = app->afl.data[i + 2];
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// Iterate through all records in file
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for(uint8_t record = record_start; record <= record_end; ++record) {
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card_num_read |= emv_read_sfi_record(tx_rx, app, sfi, record);
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}
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}
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return card_num_read;
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}
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bool emv_search_application(FuriHalNfcTxRxContext* tx_rx, EmvApplication* emv_app) {
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furi_assert(tx_rx);
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furi_assert(emv_app);
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memset(emv_app, 0, sizeof(EmvApplication));
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return emv_select_ppse(tx_rx, emv_app);
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}
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bool emv_read_bank_card(FuriHalNfcTxRxContext* tx_rx, EmvApplication* emv_app) {
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furi_assert(tx_rx);
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furi_assert(emv_app);
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bool card_num_read = false;
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memset(emv_app, 0, sizeof(EmvApplication));
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do {
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if(!emv_select_ppse(tx_rx, emv_app)) break;
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if(!emv_select_app(tx_rx, emv_app)) break;
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if(emv_get_processing_options(tx_rx, emv_app)) {
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card_num_read = true;
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} else {
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card_num_read = emv_read_files(tx_rx, emv_app);
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}
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} while(false);
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return card_num_read;
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}
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bool emv_card_emulation(FuriHalNfcTxRxContext* tx_rx) {
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furi_assert(tx_rx);
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bool emulation_complete = false;
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memset(tx_rx, 0, sizeof(FuriHalNfcTxRxContext));
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do {
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FURI_LOG_D(TAG, "Read select PPSE command");
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if(!furi_hal_nfc_tx_rx(tx_rx, 300)) break;
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|
|
memcpy(tx_rx->tx_data, select_ppse_ans, sizeof(select_ppse_ans));
|
|
tx_rx->tx_bits = sizeof(select_ppse_ans) * 8;
|
|
tx_rx->tx_rx_type = FuriHalNfcTxRxTypeDefault;
|
|
FURI_LOG_D(TAG, "Send select PPSE answer and read select App command");
|
|
if(!furi_hal_nfc_tx_rx(tx_rx, 300)) break;
|
|
|
|
memcpy(tx_rx->tx_data, select_app_ans, sizeof(select_app_ans));
|
|
tx_rx->tx_bits = sizeof(select_app_ans) * 8;
|
|
tx_rx->tx_rx_type = FuriHalNfcTxRxTypeDefault;
|
|
FURI_LOG_D(TAG, "Send select App answer and read get PDOL command");
|
|
if(!furi_hal_nfc_tx_rx(tx_rx, 300)) break;
|
|
|
|
memcpy(tx_rx->tx_data, pdol_ans, sizeof(pdol_ans));
|
|
tx_rx->tx_bits = sizeof(pdol_ans) * 8;
|
|
tx_rx->tx_rx_type = FuriHalNfcTxRxTypeDefault;
|
|
FURI_LOG_D(TAG, "Send get PDOL answer");
|
|
if(!furi_hal_nfc_tx_rx(tx_rx, 300)) break;
|
|
|
|
emulation_complete = true;
|
|
} while(false);
|
|
|
|
return emulation_complete;
|
|
}
|