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libn_app.c
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libn_app.c
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/*******************************************************************************
* $NANO Wallet for Ledger Nano S & Blue
* (c) 2016 Ledger
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
********************************************************************************/
#include "os.h"
#include "os_io_seproxyhal.h"
#include "libn_internal.h"
#include "libn_apdu_constants.h"
#include "libn_bagl.h"
#ifdef HAVE_IO_U2F
#include "u2f_transport.h"
#include "u2f_processing.h"
#endif // HAVE_IO_U2F
void libn_bagl_idle(void);
void ui_ticker_event(bool uxAllowed);
void app_dispatch(void) {
uint8_t cla;
uint8_t ins;
uint8_t dispatched;
uint16_t statusWord;
uint32_t apduHash;
libn_apdu_response_t *resp = &libn_context_D.response;
// nothing to reply for now
resp->outLength = 0;
resp->ioFlags = 0;
BEGIN_TRY_L(dispatch) {
TRY_L(dispatch) {
// If halted, then notify
SB_CHECK(libn_context_D.halted);
if (SB_GET(libn_context_D.halted)) {
statusWord = LIBN_SW_HALTED;
goto sendSW;
}
#ifdef HAVE_IO_U2F
if (G_io_apdu_state == APDU_U2F) {
apduHash = libn_simple_hash(G_io_apdu_buffer, libn_context_D.inLength);
if (apduHash == libn_context_D.u2fRequestHash) {
if (libn_context_D.state != LIBN_STATE_READY) {
// Request ongoing, setup a timeout
libn_context_D.u2fTimeout = U2F_REQUEST_TIMEOUT;
resp->ioFlags |= IO_ASYNCH_REPLY;
statusWord = LIBN_SW_OK;
goto sendSW;
} else if (libn_context_D.stateData.asyncResponse.outLength > 0) {
// Immediately return the previous response to this request
libn_context_move_async_response();
goto sendBuffer;
}
}
}
#endif // HAVE_IO_U2F
cla = G_io_apdu_buffer[ISO_OFFSET_CLA];
ins = G_io_apdu_buffer[ISO_OFFSET_INS];
for (dispatched = 0; dispatched < DISPATCHER_APDUS; dispatched++) {
if ((cla == DISPATCHER_CLA[dispatched]) &&
(ins == DISPATCHER_INS[dispatched])) {
break;
}
}
if (dispatched == DISPATCHER_APDUS) {
statusWord = LIBN_SW_INS_NOT_SUPPORTED;
goto sendSW;
}
if (DISPATCHER_DATA_IN[dispatched]) {
if (G_io_apdu_buffer[ISO_OFFSET_LC] == 0x00 ||
libn_context_D.inLength - 5 == 0) {
statusWord = LIBN_SW_INCORRECT_LENGTH;
goto sendSW;
}
// notify we need to receive data
// io_exchange(CHANNEL_APDU | IO_RECEIVE_DATA, 0);
}
// call the apdu handler
statusWord = ((apduProcessingFunction)PIC(
DISPATCHER_FUNCTIONS[dispatched]))(resp);
#ifdef HAVE_IO_U2F
if (G_io_apdu_state == APDU_U2F && (resp->ioFlags & IO_ASYNCH_REPLY) != 0) {
// Setup the timeout and request details
libn_context_D.u2fRequestHash = apduHash;
libn_context_D.u2fTimeout = U2F_REQUEST_TIMEOUT;
}
#endif // HAVE_IO_U2F
sendSW:
// prepare SW after replied data
resp->buffer[resp->outLength] = (statusWord >> 8);
resp->buffer[resp->outLength + 1] = (statusWord & 0xff);
resp->outLength += 2;
sendBuffer: {}
}
CATCH_L(dispatch, EXCEPTION_IO_RESET) {
THROW(EXCEPTION_IO_RESET);
}
CATCH_OTHER_L(dispatch, e) {
// uncaught exception detected
resp->outLength = 2;
resp->buffer[0] = 0x6F;
resp->buffer[1] = e;
// we caught something suspicious
SB_SET(libn_context_D.halted, 1);
}
FINALLY_L(dispatch);
}
END_TRY_L(dispatch);
}
void app_async_response(libn_apdu_response_t *resp, uint16_t statusWord) {
resp->buffer[resp->outLength] = (statusWord >> 8);
resp->buffer[resp->outLength + 1] = (statusWord & 0xff);
resp->outLength += 2;
// Queue up the response to be sent when convenient
libn_context_D.state = LIBN_STATE_READY;
os_memmove(&libn_context_D.stateData.asyncResponse, resp, sizeof(libn_apdu_response_t));
app_apply_state();
}
bool app_send_async_response(libn_apdu_response_t *resp) {
#ifdef HAVE_IO_U2F
if (G_io_apdu_state == APDU_IDLE) {
return false;
}
libn_context_D.u2fTimeout = 0;
#endif // HAVE_IO_U2F
// Move the async result data to sync buffer
libn_context_move_async_response();
io_exchange(CHANNEL_APDU | IO_RETURN_AFTER_TX,
libn_context_D.response.outLength);
return true;
}
bool app_apply_state(void) {
if (!UX_DISPLAYED() || io_seproxyhal_spi_is_status_sent()) {
return false;
}
// First make sure that the UI displays the correct state
bool uxChanged = libn_bagl_apply_state();
if (uxChanged) {
return true;
}
// In READY state, try to return the queued asyncResponse
if (libn_context_D.state == LIBN_STATE_READY &&
libn_context_D.stateData.asyncResponse.outLength > 0) {
bool responseSent = app_send_async_response(&libn_context_D.stateData.asyncResponse);
if (responseSent) {
return true;
}
}
// Everything seems to be in sync
return false;
}
void app_init(void) {
UX_INIT();
io_seproxyhal_init();
libn_context_init();
// deactivate usb before activating
USB_power(false);
USB_power(true);
#if defined(TARGET_NANOX)
G_io_app.plane_mode = os_setting_get(OS_SETTING_PLANEMODE, NULL, 0);
BLE_power(0, NULL);
BLE_power(1, "Nano X");
#endif
libn_bagl_idle();
}
void app_main(void) {
os_memset(libn_context_D.response.buffer, 0, 255); // paranoia
// Process the incoming APDUs
// first exchange, no out length :) only wait the apdu
libn_context_D.response.outLength = 0;
libn_context_D.response.ioFlags = 0;
for (;;) {
L_DEBUG_APP(("Main Loop\n"));
// os_memset(G_io_apdu_buffer, 0, 255); // paranoia
// receive the whole apdu using the 7 bytes headers (ledger transport)
libn_context_D.inLength =
io_exchange(CHANNEL_APDU | libn_context_D.response.ioFlags,
// use the previous outlength as the reply
libn_context_D.response.outLength);
app_dispatch();
// reply during reception of next apdu
}
L_DEBUG_APP(("End of main loop\n"));
// in case reached
reset();
}
void app_exit(void) {
BEGIN_TRY_L(exit) {
TRY_L(exit) {
os_sched_exit(-1);
}
FINALLY_L(exit) {
}
}
END_TRY_L(exit);
}
#ifdef HAVE_IO_U2F
void u2f_message_timeout() {
libn_context_D.u2fTimeout = 0;
G_io_apdu_buffer[0] = 0x69;
G_io_apdu_buffer[1] = 0x85;
u2f_message_reply(&G_io_u2f, U2F_CMD_MSG, G_io_apdu_buffer, 2);
// reset apdu state
#if defined(TARGET_NANOX)
G_io_app.apdu_state = APDU_IDLE;
G_io_app.apdu_length = 0;
G_io_app.apdu_media = IO_APDU_MEDIA_NONE;
#else
G_io_apdu_state = APDU_IDLE;
#if CX_APILEVEL < 10
G_io_apdu_length = 0;
#else
G_io_app.apdu_length = 0;
#endif
G_io_apdu_media = IO_APDU_MEDIA_NONE;
#endif
}
#endif // HAVE_IO_U2F
// override point, but nothing more to do
void io_seproxyhal_display(const bagl_element_t *element) {
io_seproxyhal_display_default((bagl_element_t *)element);
}
uint16_t io_exchange_al(uint8_t channel, uint16_t tx_len) {
switch (channel & ~(IO_FLAGS)) {
case CHANNEL_KEYBOARD:
break;
// multiplexed io exchange over a SPI channel and TLV encapsulated protocol
case CHANNEL_SPI:
if (tx_len) {
io_seproxyhal_spi_send(G_io_apdu_buffer, tx_len);
if (channel & IO_RESET_AFTER_REPLIED) {
reset();
}
return 0; // nothing received from the master so far (it's a tx
// transaction)
} else {
return io_seproxyhal_spi_recv(G_io_apdu_buffer,
sizeof(G_io_apdu_buffer), 0);
}
default:
THROW(INVALID_PARAMETER);
}
return 0;
}
uint8_t io_event(uint8_t channel) {
// nothing done with the event, throw an error on the transport layer if
// needed
// can't have more than one tag in the reply, not supported yet.
switch (G_io_seproxyhal_spi_buffer[0]) {
case SEPROXYHAL_TAG_FINGER_EVENT:
UX_FINGER_EVENT(G_io_seproxyhal_spi_buffer);
break;
case SEPROXYHAL_TAG_BUTTON_PUSH_EVENT:
UX_BUTTON_PUSH_EVENT(G_io_seproxyhal_spi_buffer);
break;
case SEPROXYHAL_TAG_STATUS_EVENT:
if (G_io_apdu_media == IO_APDU_MEDIA_USB_HID &&
!(U4BE(G_io_seproxyhal_spi_buffer, 3) &
SEPROXYHAL_TAG_STATUS_EVENT_FLAG_USB_POWERED)) {
THROW(EXCEPTION_IO_RESET);
}
// no break is intentional
default:
UX_DEFAULT_EVENT();
break;
case SEPROXYHAL_TAG_DISPLAY_PROCESSED_EVENT:
UX_DISPLAYED_EVENT({
app_apply_state();
});
break;
case SEPROXYHAL_TAG_TICKER_EVENT:
if (app_apply_state()) {
// Apply caused changed, nothing else to do this cycle
break;
}
#ifdef HAVE_IO_U2F
if (libn_context_D.u2fTimeout > 0) {
libn_context_D.u2fTimeout -= MIN(100, libn_context_D.u2fTimeout);
if (libn_context_D.u2fTimeout == 0) {
u2f_message_timeout();
break;
}
}
#endif // HAVE_IO_U2F
UX_TICKER_EVENT(G_io_seproxyhal_spi_buffer, {
ui_ticker_event(UX_ALLOWED);
});
break;
}
// close the event if not done previously (by a display or whatever)
if (!io_seproxyhal_spi_is_status_sent()) {
io_seproxyhal_general_status();
}
// command has been processed, DO NOT reset the current APDU transport
return 1;
}