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contactless_k3.h
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/* contactless_k3.h - EVM Contactless Kernel 3 (Visa) implementation
* Copyright 2019 Daniel Hu <[email protected]>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, and the entire permission notice in its entirety,
* including the disclaimer of warranties.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote
* products derived from this software without specific prior
* written permission.
*
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ALL OF
* WHICH ARE HEREBY DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
* USE OF THIS SOFTWARE, EVEN IF NOT ADVISED OF THE POSSIBILITY OF SUCH
* DAMAGE.
*
*
*/
#ifndef CONTACTLESS_K3_H
#define CONTACTLESS_K3_H
#include "emv.h"
namespace emv::contactless {
class kernel3 : public kernel {
class database : public tlv_db {
public:
database() : tlv_db{}, decline_required_by_reader{false}, online_required_by_reader{false}, static_oda_data{secure_vector{}} {};
bool decline_required_by_reader;
bool online_required_by_reader;
secure_vector static_oda_data;
};
private:
class read_responder : public modulel2::responder {
public:
read_responder(kernel3* k3) : modulel2::responder(0, k3->emvl2), k3{k3} {};
virtual void handle_apdu(const secure_vector& apdu) override {
modulel2::responder::handle_apdu(apdu);
uint8_t sw1 = apdu[apdu.size() - 2];
uint8_t sw2 = apdu[apdu.size() - 1];
if (sw1 == 0x90 && sw2 == 0x00) {
auto parser = [&](uint32_t tag, auto begin, auto end, bool combined) mutable -> bool {
if (combined) {
auto first = AFL_94.get_first_record(next);
auto oda_num = AFL_94.get_oda_records(next);
auto sfi = AFL_94.get_sfi(next);
pr_debug("\nGot sfi ", static_cast<int>(sfi), " record #", static_cast<int>(next_record), " total oda records ", static_cast<int>(oda_num), "\n");
if (first + oda_num > next_record) {
if (tag != 0x70) {
pr_error("oda data not having tag 0x70\n");
return false;
} else if (sfi <= 10) {
secure_vector data{begin, end};
pr_debug("APPEND ", data, "\n");
std::copy(begin, end, back_inserter(k3->kernel_db.static_oda_data));
}
}
};
return (*k3)(tag, begin, end, combined);
};
auto first = AFL_94.get_first_record(next);
auto oda_num = AFL_94.get_oda_records(next);
if (first + oda_num > next_record) {
auto sfi = AFL_94.get_sfi(next);
if (sfi > 10) {
pr_debug("sfi ", static_cast<int>(sfi), " record ", static_cast<int>(next_record), "\n");
secure_vector data{apdu.begin(), apdu.end() - 2};
pr_debug("APPEND ", data, "\n");
std::copy(apdu.begin(), apdu.end() - 2, back_inserter(k3->kernel_db.static_oda_data));
}
};
bool ret = tlv_visit(apdu.begin(), apdu.end() - 2, parser);
if (!ret) {
k3->end_application();
return;
}
next_record++;
if (next_record <= AFL_94.get_last_record(next)) {
k3->read_card();
} else {
next += 4;
if (next >= afl.data() + afl.size()) {
k3->complete_read();
} else {
next_record = AFL_94.get_first_record(next);
k3->read_card();
}
}
} else {
k3->end_application();
return;
}
return;
}
virtual void timeout() override{};
uint8_t next_record;
secure_vector afl;
const uint8_t* next;
kernel3* k3;
};
class gpo_responder : public modulel2::responder {
public:
gpo_responder(kernel3* k3) : modulel2::responder(0, k3->emvl2), k3{k3} {};
virtual void handle_apdu(const secure_vector& apdu) override {
modulel2::responder::handle_apdu(apdu);
uint8_t sw1 = apdu[apdu.size() - 2];
uint8_t sw2 = apdu[apdu.size() - 1];
if (sw1 == 0x90 && sw2 == 0x00) {
auto parser = [&](uint32_t tag, auto begin, auto end, bool combined) mutable -> bool {
if (tag == 0x80) { // format 1, always AIP (2 bytes) + AFL
if (end - begin >= 2) {
auto p = begin + 2;
return (*k3)(AIP_82.id, begin, p, false) && (*k3)(AFL_94.id, p, end, false);
} else {
return false;
};
} else {
return (*k3)(tag, begin, end, combined);
};
};
bool ret = tlv_visit(apdu.begin(), apdu.end() - 2, parser);
if (!ret) {
k3->end_application();
return;
};
if (k3->kernel_db.has_tag(AFL_94)) {
k3->state_wait_for_read.afl = k3->kernel_db[AFL_94];
const uint8_t* next = k3->state_wait_for_read.afl.data();
k3->state_wait_for_read.next = next;
k3->state_wait_for_read.next_record = AFL_94.get_first_record(next);
k3->read_card();
return;
}
k3->complete_read();
// start read record
} else if (sw1 == 0x69 && sw2 == 0x84) { // 5.2.2.2
k3->try_contact();
} else if (sw1 == 0x69 && sw2 == 0x85) {
k3->select_next();
} else if (sw1 == 0x69 && sw2 == 0x86) {
k3->end_application();
};
}
virtual void timeout() override{};
kernel3* k3;
};
public:
kernel3(modulel2* emvl2) : emvl2(emvl2), state_wait_for_gpo_response{gpo_responder{this}}, state_wait_for_read{read_responder{this}} {};
virtual bool start(uint8_t sw1, uint8_t sw2, const tlv_db fci, const candidate* candy, const issuer_script script, modulel2* l2) override {
pr_debug("starting kernel3\n");
emvl2 = l2;
this->candy = candy;
if (script.size() != 0) {
pr_debug("issuer script update\n");
} else if (fci.has_tag(IDSD_D2) && candy->extended_selection.size() != 0) {
pr_debug("IDS procesing\n");
} else {
pr_debug("New transaction\n");
kernel_db = database{};
kernel_db.emplace(ADF_NAME_4F.id, candy->adf_name);
if (candy->extended_selection.size() != 0)
kernel_db.emplace(EXTENDED_SELECTION_9F29.id, candy->extended_selection);
auto combo = candy->combo;
kernel_db.insert(emvl2->l2_cfgs.terminal_cfg);
kernel_db.update(combo->krn->db);
kernel_db.update(combo->app->db);
kernel_db.update(combo->transact->db);
kernel_db.update(combo->db);
kernel_db.insert(fci);
// TTQ from preprocessing
if (combo->indicator.ttq) {
tlv_obj tlv(TTQ_9F66.id, *(combo->indicator.ttq));
kernel_db.update(tlv);
pr_debug("our TTQ from preprocessing: ", tlv.second, "\n");
dump(TTQ_9F66, tlv.second);
}
// PDOL availability should have been checked by entry point
auto& dol = fci[PDOL_9F38];
secure_vector tags{};
secure_vector missing{};
build_dol(PDOL_9F38.id, dol, kernel_db, tags, missing);
tags = make_tlv(0x83, tags);
emvl2->set_state(&state_wait_for_gpo_response);
emvl2->send_apdu(apdu_builder::build(COMMANDS::GPO).data(tags).le(0).to_bytes());
}
return true;
}
bool operator()(uint32_t tag, secure_vector::const_iterator begin,
secure_vector::const_iterator end, bool combined) {
//logger.debug("TAG : ", to_hex(tag), "\n");
if (!combined) {
// 5.4.2.2
if (kernel_db.has_tag(tag)) {
logger.error("duplicated tlv found from card ", to_hex(tag));
return false;
};
secure_vector v{begin, end};
// A.2 Kernel 3
if (tag == TRACK2_57.id && kernel_db.has_tag(PAN_5A)) {
auto pan_5A = kernel_db(PAN_5A);
auto pan_57 = TRACK2_57.get_pan(v);
if (pan_57 != pan_5A) {
pr_debug("pan error: 57 does not match existing 5A\n");
return false;
}
} else if (tag == PAN_5A.id && kernel_db.has_tag(TRACK2_57)) {
auto& _v = kernel_db[TRACK2_57];
if (TRACK2_57.get_pan(_v) != PAN_5A.to_string(v)) {
pr_debug("pan error : 5A does not match existing 57\n");
return false;
}
}
//4.1.1.1
if (tag == FFI_9F6E.id) {
v[3] &= 0xF0;
};
tlv_print(tag, v);
if (!tlv_validate(tag, v)) {
logger.error("tag ", to_hex(tag), " format error\n");
return false;
}
tlv_obj obj{tag, std::move(v)};
kernel_db.insert(std::move(obj));
}
return true;
};
public:
static constexpr std::array<const tag_info*, 14> mandatory_tags{
// must be present in terminal
&AMOUNT_AUTHORISED_9F02,
&MERCHANT_NAME_AND_LOCATION_9F4E,
&TRANSACTION_CURRENCY_CODE_5F2A,
&TRANSACTION_DATE_9A,
&TRANSACTION_TYPE_9C,
&TERMINAL_COUNTRY_CODE_9F1A,
&UNPREDICTABLE_NUMBER_9F37,
// must be present in card
&APPLICATION_CRYPTOGRAM_9F26,
&AIP_82,
&ATC_9F36,
&DF_NAME_84,
&ISSUER_APPLICATION_DATA_9F10,
&TRACK2_57,
&PDOL_9F38};
void try_contact() {
outcome o(OUTCOME_TYPE::TRY_ANOTHER_INTERFACE);
o.start = RESTART_POINT::NA;
o.kernel_restart_cond = OUTCOME_KERNEL_RESTART_COND::NA;
o.cvm = OUTCOME_CVM::NA;
o.ui_request = true;
o.ui_request_data.ui_id = ui_message_id::INSERT_CARD;
o.ui_request_data.status = ui_status_id::PROCESSING_ERR;
o.ui_on_restart = false;
o.data_record_present = false;
o.discretionary_data_present = false;
o.alt_interface = INTERFACE_TYPE::CONTACT;
o.receipt = false;
o.field_off_request = -1;
o.removal_timeout = 0;
emvl2->generate_outcome(o);
};
void insert_or_swipe() {
outcome o(OUTCOME_TYPE::TRY_ANOTHER_INTERFACE);
o.start = RESTART_POINT::NA;
o.kernel_restart_cond = OUTCOME_KERNEL_RESTART_COND::NA;
o.cvm = OUTCOME_CVM::NA;
o.ui_request = true;
o.ui_request_data.ui_id = ui_message_id::INSERT_OR_SWIPE;
o.ui_request_data.status = ui_status_id::PROCESSING_ERR;
o.ui_on_restart = false;
o.data_record_present = false;
o.discretionary_data_present = false;
o.alt_interface = INTERFACE_TYPE::NA;
o.receipt = false;
o.field_off_request = -1;
o.removal_timeout = 0;
emvl2->generate_outcome(o);
};
void select_next() {
outcome o(OUTCOME_TYPE::SELECT_NEXT);
o.start = RESTART_POINT::C;
o.kernel_restart_cond = OUTCOME_KERNEL_RESTART_COND::NA;
o.cvm = OUTCOME_CVM::NA;
o.ui_request = false;
o.ui_on_restart = false;
o.data_record_present = false;
o.discretionary_data_present = false;
o.alt_interface = INTERFACE_TYPE::NA;
o.receipt = false;
o.field_off_request = -1;
o.removal_timeout = 0;
emvl2->generate_outcome(o);
};
void try_again() {
outcome o(OUTCOME_TYPE::TRY_AGAIN);
o.start = RESTART_POINT::B;
o.kernel_restart_cond = OUTCOME_KERNEL_RESTART_COND::NA;
o.cvm = OUTCOME_CVM::NA;
o.ui_request = true;
o.ui_request_data.ui_id = ui_message_id::CHECK_PHONE;
o.ui_request_data.status = ui_status_id::PROCESSING_ERR;
o.ui_request_data.hold_time = 13;
o.ui_on_restart = true;
o.ui_restart_data.status = ui_status_id::PRESENT_CARD;
o.data_record_present = false;
o.discretionary_data_present = false;
o.alt_interface = INTERFACE_TYPE::NA;
o.receipt = false;
o.field_off_request = 13;
o.removal_timeout = 0;
emvl2->generate_outcome(o);
};
void end_application() {
outcome o(OUTCOME_TYPE::END_APPLICATION);
o.start = RESTART_POINT::NA;
o.kernel_restart_cond = OUTCOME_KERNEL_RESTART_COND::NA;
o.cvm = OUTCOME_CVM::NA;
o.ui_request = true;
o.ui_request_data.ui_id = ui_message_id::INSERT_SWIPE_TRY_ANOTHER;
o.ui_request_data.status = ui_status_id::PROCESSING_ERR;
o.ui_on_restart = false;
o.data_record_present = false;
o.discretionary_data_present = false;
o.alt_interface = INTERFACE_TYPE::NA;
o.receipt = false;
o.field_off_request = -1;
o.removal_timeout = 0;
emvl2->generate_outcome(o);
};
void read_card() {
const uint8_t* next = state_wait_for_read.next;
uint8_t sfi = AFL_94.get_sfi(next);
emvl2->set_state(&state_wait_for_read);
emvl2->send_apdu(apdu_builder::build(COMMANDS::READ_RECORD).p1(state_wait_for_read.next_record).p2((sfi << 3) | 4).le(0).to_bytes());
};
bool check_mandatory() {
// 5.4.2.1
for (auto p : mandatory_tags) {
if (!kernel_db.has_tag(*p)) {
pr_debug(p->desc, " <", to_hex(p->id), "> is missing\n");
return false;
}
};
auto transact_type = kernel_db(TRANSACTION_TYPE_9C);
if (transact_type == TRANSACTION_TYPE::PURCHASE_WITH_CASHBACK && kernel_db.has_tag(AMOUNT_OTHER_9F03)) {
pr_debug("missing Amount Other for cash tranaction\n");
return false;
}
auto& aip = kernel_db[AIP_82];
pr_debug("AIP from card: ", aip, "\n");
dump(AIP_82, kernel_db[AIP_82]);
auto& ttq = kernel_db[TTQ_9F66];
pr_debug("TTQ for terminal: ", ttq, "\n");
dump(TTQ_9F66, ttq);
auto k3cfg = candy->combo->krn;
if ((v_get_bit(aip, TAG_AIP_82::dda_supported) || v_get_bit(aip, TAG_AIP_82::sda_supported_for_online_auth)) &&
v_get_bit(ttq, TAG_TTQ_9F66::offline_data_auth_for_online_authorization_supported) && k3cfg->fddaForOnlineSupported) {
if (!kernel_db.has_tag(SDAD_9F4B) &&
!kernel_db.has_tag(SIGNED_STATIC_APPLICATION_DATA_93)) {
pr_debug("missing tag 9F4B and 93\n");
return false;
}
if (v_get_bit(aip, TAG_AIP_82::dda_supported) &&
(!kernel_db.has_tag(SDAD_9F4B) ||
!kernel_db.has_tag(CA_PUBLIC_KEY_INDEX_8F) ||
emvl2->find_ca_key(get_rid(), kernel_db(CA_PUBLIC_KEY_INDEX_8F)) == nullptr ||
!kernel_db.has_tag(ISSUER_PUB_KEY_CERT_90) ||
!kernel_db.has_tag(ISSUER_PUB_KEY_EXP_9F32) ||
!kernel_db.has_tag(ISSUER_PUB_KEY_REMAINER_92) ||
!kernel_db.has_tag(ICC_PUB_KEY_CERT_9F46) ||
!kernel_db.has_tag(ICC_PUB_KEY_EXP_9F47) ||
!kernel_db.has_tag(KERNEL3::CARD_AUTH_RELATED_DATA_9F69) ||
!kernel_db.has_tag(PAN_5A))) {
pr_debug("missing tag needed for DDA\n");
return false;
}
if (v_get_bit(aip, TAG_AIP_82::sda_supported_for_online_auth) &&
(!kernel_db.has_tag(SIGNED_STATIC_APPLICATION_DATA_93) ||
!kernel_db.has_tag(CA_PUBLIC_KEY_INDEX_8F) ||
emvl2->find_ca_key(get_rid(), kernel_db(CA_PUBLIC_KEY_INDEX_8F)) == nullptr ||
!kernel_db.has_tag(ISSUER_PUB_KEY_CERT_90) ||
!kernel_db.has_tag(ISSUER_PUB_KEY_EXP_9F32) ||
!kernel_db.has_tag(ISSUER_PUB_KEY_REMAINER_92) ||
!kernel_db.has_tag(PAN_5A))) {
pr_debug("missing needed tag for SDA \n");
return false;
}
};
return true;
};
void complete_read() {
pr_debug("\n\n... card read completed ...\n");
if (kernel_db.has_tag(CTQ_9F6C)) {
pr_debug("CTQ from card:\n");
dump(CTQ_9F6C, kernel_db[CTQ_9F6C]);
}
struct ui_req_data ui {};
ui.ui_id = ui_message_id::READ_OK;
ui.status = ui_status_id::CARD_READ_OK;
send_ui_event(ui);
if (!check_mandatory()) {
end_application();
return;
}
// 5.4.3.1
if (!kernel_db.has_tag(CID_9F27)) {
secure_vector v(CID_9F27.maxlen);
CID_9F27.set_type(v, kernel_db(ISSUER_APPLICATION_DATA_9F10));
kernel_db.emplace(CID_9F27.id, std::move(v));
};
//5.4.3.2
auto type = kernel_db(CID_9F27);
switch (type) {
case AC_TYPE::AAC:
pr_debug("Got ACC from card\n");
kernel_db.decline_required_by_reader = true;
break;
case AC_TYPE::ARQC:
pr_debug("Got ARQC from card\n");
kernel_db.online_required_by_reader = true;
break;
case AC_TYPE::TC:
pr_debug("Got TC from card\n");
if (kernel_db.get_bit(TTQ_9F66, TAG_TTQ_9F66::online_cryptogram_required)) {
pr_debug("our TTQ rquires online cryptogram\n");
kernel_db.online_required_by_reader = true;
}
break;
default:
pr_debug("unrecoginized cryptogram type\n");
kernel_db.decline_required_by_reader = true;
};
if (!process_restriction())
return;
if (!process_offline_auth())
return;
OUTCOME_CVM cvm = OUTCOME_CVM::NA;
if (!kernel_db.decline_required_by_reader) {
cvm = process_cvm();
};
if (!kernel_db.decline_required_by_reader &&
kernel_db.online_required_by_reader) {
process_online(cvm);
};
if (!kernel_db.decline_required_by_reader &&
!kernel_db.online_required_by_reader) {
complete_offline(cvm);
};
if (kernel_db.decline_required_by_reader) {
decline_transaction();
};
};
void decline_transaction() {
outcome o(OUTCOME_TYPE::DECLINED);
o.start = RESTART_POINT::NA;
o.cvm = OUTCOME_CVM::NO_CVM;
o.ui_request = true;
o.ui_request_data.ui_id = ui_message_id::NOT_AUTHORIZED;
o.ui_on_restart = false;
o.data_record_present = false;
// 4.3.1.1
if (kernel_db.has_tag(KERNEL3::AOSA_9F5D)) {
// value qualifier, value, currency code 4.3.1.1
auto& aosa = kernel_db[KERNEL3::AOSA_9F5D];
o.ui_request_data.value_type = ui_value_id::BALANCE;
o.ui_request_data.value = KERNEL3::AOSA_9F5D.to_string(aosa);
o.ui_request_data.currency_code = TRANSACTION_CURRENCY_CODE_5F2A.to_string(kernel_db[TRANSACTION_CURRENCY_CODE_5F2A]);
// Discretionary Data Present: see requirement 4.3.1.1
o.discretionary_data_present = true;
o.discretionary_data = make_tlv(KERNEL3::AOSA_9F5D.id, aosa);
};
o.alt_interface = INTERFACE_TYPE::NA;
o.receipt = false;
o.removal_timeout = 0;
o.field_off_request = -1;
emvl2->generate_outcome(o);
};
void complete_offline(OUTCOME_CVM cvm) {
outcome o(OUTCOME_TYPE::APPROVED);
o.start = RESTART_POINT::NA;
o.cvm = cvm;
o.ui_request = true;
o.ui_request_data.ui_id = ui_message_id::APPROVED;
o.data_record_present = true;
prepare_emv_outcome_data(o.data_record);
// 4.3.1.1
if (kernel_db.has_tag(KERNEL3::AOSA_9F5D)) {
// value qualifier, value, currency code 4.3.1.1
auto& aosa = kernel_db[KERNEL3::AOSA_9F5D];
o.ui_request_data.value_type = ui_value_id::BALANCE;
o.ui_request_data.value = KERNEL3::AOSA_9F5D.to_string(aosa);
o.ui_request_data.currency_code = TRANSACTION_CURRENCY_CODE_5F2A.to_string(kernel_db[TRANSACTION_CURRENCY_CODE_5F2A]);
// Discretionary Data Present: see requirement 4.3.1.1
o.discretionary_data_present = true;
o.discretionary_data = make_tlv(KERNEL3::AOSA_9F5D.id, aosa);
};
o.alt_interface = INTERFACE_TYPE::NA;
o.receipt = false;
o.removal_timeout = 0;
o.field_off_request = -1;
emvl2->generate_outcome(o);
};
void process_online(OUTCOME_CVM cvm) {
outcome o(OUTCOME_TYPE::ONLINE_REQUEST);
o.cvm = cvm;
o.ui_request = true;
o.ui_request_data.ui_id = ui_message_id::AUTHORISING;
// 4.3.1.1
if (kernel_db.has_tag(KERNEL3::AOSA_9F5D)) {
// value qualifier, value, currency code 4.3.1.1
auto& aosa = kernel_db[KERNEL3::AOSA_9F5D];
o.ui_request_data.value_type = ui_value_id::BALANCE;
o.ui_request_data.value = KERNEL3::AOSA_9F5D.to_string(aosa);
o.ui_request_data.currency_code = TRANSACTION_CURRENCY_CODE_5F2A.to_string(kernel_db[TRANSACTION_CURRENCY_CODE_5F2A]);
// Discretionary Data Present: see requirement 4.3.1.1
o.discretionary_data_present = true;
o.discretionary_data = make_tlv(KERNEL3::AOSA_9F5D.id, aosa);
};
o.data_record_present = true;
prepare_emv_outcome_data(o.data_record);
o.alt_interface = INTERFACE_TYPE::NA;
o.receipt = false;
o.removal_timeout = 0;
auto& ttq = kernel_db[TTQ_9F66];
// 5.8.1.2
if (v_get_bit(ttq, TAG_TTQ_9F66::issuer_update_processing_supported) &&
kernel_db.has_tag(CTQ_9F6C) &&
kernel_db.get_bit(CTQ_9F6C, TAG_CTQ_9F6C::card_support_issuer_update)) {
o.start = RESTART_POINT::B;
o.kernel_restart_cond = OUTCOME_KERNEL_RESTART_COND::EMV_DATA_AVAIL;
o.ui_on_restart = true;
o.ui_restart_data.ui_id = ui_message_id::TRY_AGAIN;
o.field_off_request = 0;
} else {
o.start = RESTART_POINT::NA;
o.kernel_restart_cond = OUTCOME_KERNEL_RESTART_COND::NA;
o.ui_on_restart = false;
o.field_off_request = -1;
}
emvl2->generate_outcome(o);
};
OUTCOME_CVM process_cvm() {
// 5.7.1.1
auto& ttq = kernel_db[TTQ_9F66];
if (v_get_bit(ttq, TAG_TTQ_9F66::cvm_required) &&
!kernel_db.has_tag(CTQ_9F6C)) {
if (v_get_bit(ttq, TAG_TTQ_9F66::signature_supported)) {
return OUTCOME_CVM::SIGNATURE;
}
if (v_get_bit(ttq, TAG_TTQ_9F66::online_pin_supported) &&
v_get_bit(ttq, TAG_TTQ_9F66::consumer_device_cvm_supported)) {
return OUTCOME_CVM::ONLINE_PIN;
} else if (v_get_bit(ttq, TAG_TTQ_9F66::consumer_device_cvm_supported)) {
kernel_db.decline_required_by_reader = true;
return OUTCOME_CVM::NA;
}
}
// 5.7.1.2
if (kernel_db.has_tag(CTQ_9F6C)) {
auto& ctq = kernel_db[CTQ_9F6C];
if (v_get_bit(ctq, TAG_CTQ_9F6C::online_pin_required) &&
v_get_bit(ttq, TAG_TTQ_9F66::online_pin_supported)) {
kernel_db.online_required_by_reader = true;
return OUTCOME_CVM::ONLINE_PIN;
}
if (v_get_bit(ctq, TAG_CTQ_9F6C::consumer_device_cmv_performed)) {
if (kernel_db.has_tag(KERNEL3::CARD_AUTH_RELATED_DATA_9F69)) {
auto ctq_copy = KERNEL3::CARD_AUTH_RELATED_DATA_9F69.ctq(kernel_db[KERNEL3::CARD_AUTH_RELATED_DATA_9F69]);
if (ctq == ctq_copy) {
return OUTCOME_CVM::CONF_CODE_VERIFIED;
} else {
kernel_db.decline_required_by_reader = true;
return OUTCOME_CVM::NA;
}
} else {
if (kernel_db(CID_9F27) == AC_TYPE::ARQC) {
return OUTCOME_CVM::CONF_CODE_VERIFIED;
} else {
kernel_db.decline_required_by_reader = true;
return OUTCOME_CVM::NA;
}
}
}
if (v_get_bit(ctq, TAG_CTQ_9F6C::signature_required) &&
v_get_bit(ttq, TAG_TTQ_9F66::signature_supported)) {
return OUTCOME_CVM::SIGNATURE;
}
};
// 5.7.1.3
if (v_get_bit(ttq, TAG_TTQ_9F66::cvm_required)) {
kernel_db.decline_required_by_reader = true;
};
return OUTCOME_CVM::NO_CVM;
};
bool process_offline_auth() {
// 5.6.1.2
if (!kernel_db.decline_required_by_reader && !kernel_db.online_required_by_reader) {
pr_debug("perform offline authentication\n");
if (!do_oda()) {
if (kernel_db.has_tag(CTQ_9F6C)) {
auto& ctq = kernel_db[CTQ_9F6C];
if (v_get_bit(ctq, TAG_CTQ_9F6C::online_if_oda_fail_and_reader_online_capable)) {
if (kernel_db.has_tag(TTQ_9F66)) {
auto& ttq = kernel_db[TTQ_9F66];
if (!v_get_bit(ttq, TAG_TTQ_9F66::offline_only_reader)) {
kernel_db.online_required_by_reader = true;
return true;
}
}
}
if (v_get_bit(ctq, TAG_CTQ_9F6C::switch_intf_if_oda_fail_and_reader_support_contact)) {
if (kernel_db.has_tag(TTQ_9F66)) {
auto& ttq = kernel_db[TTQ_9F66];
if (!v_get_bit(ttq, TAG_TTQ_9F66::emv_contact_chip_supported)) {
try_contact();
return false;
}
}
}
};
kernel_db.decline_required_by_reader = true;
return true;
};
} else {
pr_debug("offline data auth not required\n");
}
return true;
};
bool do_oda() {
if (!kernel_db.has_tag(CA_PUBLIC_KEY_INDEX_8F)) {
pr_debug("missing tag 8F\n");
return false;
};
auto cak = emvl2->find_ca_key(get_rid(), kernel_db(CA_PUBLIC_KEY_INDEX_8F));
if (cak == nullptr) {
pr_debug("sorry, missing ca key\n");
return false;
}
if (kernel_db.has_tag(SDAD_9F4B)) {
pr_debug("perform DDA\n");
if (!kernel_db.has_tag(KERNEL3::CARD_AUTH_RELATED_DATA_9F69))
return false;
auto& v = kernel_db[KERNEL3::CARD_AUTH_RELATED_DATA_9F69];
if (KERNEL3::CARD_AUTH_RELATED_DATA_9F69.fdda_version(v) != 0x01) {
pr_debug("fdda version not 1\n");
return false;
}
auto& sig = kernel_db[SDAD_9F4B];
secure_vector ddol(kernel_db[UNPREDICTABLE_NUMBER_9F37]);
auto& amount = kernel_db[AMOUNT_AUTHORISED_9F02];
std::copy(amount.begin(), amount.end(), back_inserter(ddol));
auto& currency_code = kernel_db[TRANSACTION_CURRENCY_CODE_5F2A];
std::copy(currency_code.begin(), currency_code.end(), back_inserter(ddol));
auto& card_auth_data = kernel_db[KERNEL3::CARD_AUTH_RELATED_DATA_9F69];
std::copy(card_auth_data.begin(), card_auth_data.end(), back_inserter(ddol));
return emvl2->verify_dda(kernel_db, cak, sig, kernel_db.static_oda_data, ddol);
}
if (kernel_db.has_tag(SIGNED_STATIC_APPLICATION_DATA_93)) {
pr_debug("perform SDA\n");
auto& sig = kernel_db[SIGNED_STATIC_APPLICATION_DATA_93];
return emvl2->verify_sda(kernel_db, cak, sig, kernel_db.static_oda_data);
}
return false;
};
bool process_restriction() {
pr_debug("process restriction\n");
bool expired = false;
// 5.5.1.1
auto cid_type = kernel_db(CID_9F27);
if (cid_type == AC_TYPE::TC) {
if (kernel_db.has_tag(APPLICATION_EXPIRE_DATE_5F24)) {
auto date = kernel_db(APPLICATION_EXPIRE_DATE_5F24);
auto now = kernel_db(TRANSACTION_DATE_9A);
pr_debug("Check card expire date ", date, " against now ", now, "\n");
if (now > date) {
expired = true;
}
} else {
pr_debug("no expire date found\n");
expired = true;
}
if (expired) {
pr_debug("application has expired\n");
if (kernel_db.has_tag(CTQ_9F6C)) {
auto& v = kernel_db[CTQ_9F6C];
if (v_get_bit(v, TAG_CTQ_9F6C::online_if_application_expired)) {
pr_debug("CTQ requires online for app expire\n");
kernel_db.online_required_by_reader = true;
} else {
kernel_db.decline_required_by_reader = true;
return true;
}
} else {
kernel_db.decline_required_by_reader = true;
return true;
}
};
};
//5.5.1.2
auto k3cfg = candy->combo->krn;
if (cid_type == AC_TYPE::TC && k3cfg->exceptionFileEnabled) {
auto& v = kernel_db[TRACK2_57];
auto pan = TRACK2_57.get_pan(v);
if (emvl2->found_on_exceptions(pan)) {
kernel_db.decline_required_by_reader = true;
return true;
};
};
// 5.5.1.3
auto transact_type = kernel_db(TRANSACTION_TYPE_9C);
if ((transact_type == TRANSACTION_TYPE::CASH || transact_type == TRANSACTION_TYPE::CASH_DISBURSEMENT) && k3cfg->aucManualCheckSupported) {
bool allowed = false;
if (kernel_db.has_tag(ISSUER_COUNTRY_CODE_5F28) && kernel_db.has_tag(AUC_9F07)) {
auto icc = kernel_db(TERMINAL_COUNTRY_CODE_9F1A);
auto tcc = kernel_db(ISSUER_COUNTRY_CODE_5F28);
auto& auc = kernel_db[AUC_9F07];
if ((icc == tcc && v_get_bit(auc, TAG_AUC_9F07::valid_for_domestic_cash)) ||
(icc != tcc && v_get_bit(auc, TAG_AUC_9F07::valid_for_international_cash))) {
allowed = true;
}
}
if (!allowed) {
if (kernel_db.has_tag(CTQ_9F6C)) {
auto& ctq = kernel_db[CTQ_9F6C];
if (v_get_bit(ctq, TAG_CTQ_9F6C::switch_intf_for_cash)) {
insert_or_swipe();
return false;
};
}
kernel_db.decline_required_by_reader = true;
return true;
}
};
//5.5.1.4
if (transact_type == TRANSACTION_TYPE::PURCHASE_WITH_CASHBACK && k3cfg->aucCashbackCheckSupported) {
bool allowed = false;
if (kernel_db.has_tag(ISSUER_COUNTRY_CODE_5F28) && kernel_db.has_tag(AUC_9F07)) {
auto icc = kernel_db(TERMINAL_COUNTRY_CODE_9F1A);
auto tcc = kernel_db(ISSUER_COUNTRY_CODE_5F28);
auto& auc = kernel_db[AUC_9F07];
if ((icc == tcc && v_get_bit(auc, TAG_AUC_9F07::domestic_cashback_allowed)) ||
(icc != tcc && v_get_bit(auc, TAG_AUC_9F07::international_cashback_allowed))) {
allowed = true;
}
}
if (!allowed) {
if (kernel_db.has_tag(CTQ_9F6C)) {
auto& ctq = kernel_db[CTQ_9F6C];
if (v_get_bit(ctq, TAG_CTQ_9F6C::switch_intf_for_cashback)) {
insert_or_swipe();
return false;
};
}
kernel_db.decline_required_by_reader = true;
return true;
}
};
return true;
};
secure_vector get_rid() {
secure_vector rid{};
auto& p = kernel_db[ADF_NAME_4F];
std::copy(p.begin(), p.begin() + 5, back_inserter(rid));
return rid;
};
void add_entry(secure_vector& records, uint32_t tag, secure_vector v) {
auto tlv = make_tlv(tag, v);
std::copy(tlv.begin(), tlv.end(), back_inserter(records));
};
void add_entry(secure_vector& records, const tag_info& tag) {
if (kernel_db.has_tag(tag)) {
auto& v = kernel_db[tag];
add_entry(records, tag.id, v);
} else {
pr_debug("<", tag.desc, "> does not exist, ignore for records\n");
};
};
void prepare_emv_outcome_data(secure_vector& records) {
secure_vector data_records;
add_entry(data_records, AMOUNT_AUTHORISED_9F02);
if (kernel_db(TRANSACTION_TYPE_9C) == TRANSACTION_TYPE::PURCHASE_WITH_CASHBACK) {
add_entry(data_records, AMOUNT_OTHER_9F03);
};
add_entry(data_records, APPLICATION_CRYPTOGRAM_9F26);
add_entry(data_records, AIP_82);
add_entry(data_records, ATC_9F36);
add_entry(data_records, PAN_SEQ_5F34);
add_entry(data_records, CUSTOMER_EXCLUSIVE_DATA_9F7C);
add_entry(data_records, ISSUER_APPLICATION_DATA_9F10);
add_entry(data_records, POS_ENTRY_MODE_9F39);
add_entry(data_records, TERMINAL_COUNTRY_CODE_9F1A);
add_entry(data_records, TERMINAL_CAPABILITIES_9F33);
add_entry(data_records, TRACK2_57);
add_entry(data_records, TRANSACTION_CURRENCY_CODE_5F2A);
add_entry(data_records, TRANSACTION_DATE_9A);
add_entry(data_records, TRANSACTION_TYPE_9C);
add_entry(data_records, UNPREDICTABLE_NUMBER_9F37);
secure_vector tvr(TVR_95.maxlen);
add_entry(data_records, TVR_95.id, tvr);
// 4.1.1.1
if (kernel_db.has_tag(FFI_9F6E)) {
auto v = kernel_db[FFI_9F6E];
v[3] &= 0xF0;
add_entry(data_records, FFI_9F6E.id, v);
}
records.swap(data_records);
};
public:
modulel2* emvl2;
database kernel_db;
const candidate* candy;
private:
gpo_responder state_wait_for_gpo_response;
read_responder state_wait_for_read;
};
}; // namespace emv::contactless
#endif