mirror of
https://github.com/trezor/trezor-firmware.git
synced 2024-12-25 07:48:10 +00:00
160 lines
4.0 KiB
C
160 lines
4.0 KiB
C
/*
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* This file is part of the TREZOR project.
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*
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* Copyright (C) 2014 Pavol Rusnak <stick@satoshilabs.com>
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*
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* This library is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <string.h>
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#include <libopencm3/stm32/rcc.h>
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#include <libopencm3/stm32/gpio.h>
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#include <libopencm3/cm3/scb.h>
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#include "bootloader.h"
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#include "buttons.h"
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#include "setup.h"
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#include "usb.h"
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#include "oled.h"
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#include "util.h"
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#include "signatures.h"
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#include "layout.h"
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#include "serialno.h"
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#include "rng.h"
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void layoutFirmwareHash(const uint8_t *hash)
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{
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char str[4][17];
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for (int i = 0; i < 4; i++) {
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data2hex(hash + i * 8, 8, str[i]);
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}
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layoutDialog(&bmp_icon_question, "Abort", "Continue", "Compare fingerprints", str[0], str[1], str[2], str[3], NULL, NULL);
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}
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void show_halt(void)
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{
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layoutDialog(&bmp_icon_error, NULL, NULL, NULL, "Unofficial firmware", "aborted.", NULL, "Unplug your TREZOR", "contact our support.", NULL);
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system_halt();
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}
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void show_unofficial_warning(const uint8_t *hash)
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{
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layoutDialog(&bmp_icon_warning, "Abort", "I'll take the risk", NULL, "WARNING!", NULL, "Unofficial firmware", "detected.", NULL, NULL);
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do {
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delay(100000);
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buttonUpdate();
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} while (!button.YesUp && !button.NoUp);
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if (button.NoUp) {
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show_halt(); // no button was pressed -> halt
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}
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layoutFirmwareHash(hash);
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do {
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delay(100000);
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buttonUpdate();
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} while (!button.YesUp && !button.NoUp);
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if (button.NoUp) {
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show_halt(); // no button was pressed -> halt
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}
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// everything is OK, user pressed 2x Continue -> continue program
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}
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void __attribute__((noreturn)) load_app(void)
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{
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load_vector_table((const vector_table_t *) FLASH_APP_START);
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}
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bool firmware_present(void)
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{
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#ifndef APPVER
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if (memcmp((const void *)FLASH_META_MAGIC, "TRZR", 4)) { // magic does not match
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return false;
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}
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if (*((const uint32_t *)FLASH_META_CODELEN) < 4096) { // firmware reports smaller size than 4kB
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return false;
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}
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if (*((const uint32_t *)FLASH_META_CODELEN) > FLASH_TOTAL_SIZE - (FLASH_APP_START - FLASH_ORIGIN)) { // firmware reports bigger size than flash size
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return false;
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}
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#endif
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return true;
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}
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void bootloader_loop(void)
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{
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oledClear();
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oledDrawBitmap(0, 0, &bmp_logo64);
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if (firmware_present()) {
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oledDrawString(52, 0, "TREZOR");
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static char serial[25];
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fill_serialno_fixed(serial);
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oledDrawString(52, 20, "Serial No.");
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oledDrawString(52, 40, serial + 12); // second part of serial
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serial[12] = 0;
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oledDrawString(52, 30, serial); // first part of serial
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oledDrawStringRight(OLED_WIDTH - 1, OLED_HEIGHT - 8, "Loader " VERSTR(VERSION_MAJOR) "." VERSTR(VERSION_MINOR) "." VERSTR(VERSION_PATCH));
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} else {
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oledDrawString(52, 10, "Welcome!");
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oledDrawString(52, 30, "Please visit");
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oledDrawString(52, 50, "trezor.io/start");
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}
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oledRefresh();
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usbLoop(firmware_present());
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}
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int main(void)
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{
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#ifndef APPVER
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setup();
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#endif
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__stack_chk_guard = random32(); // this supports compiler provided unpredictable stack protection checks
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#ifndef APPVER
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memory_protect();
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oledInit();
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#endif
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#ifndef APPVER
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// at least one button is unpressed
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uint16_t state = gpio_port_read(BTN_PORT);
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int unpressed = ((state & BTN_PIN_YES) == BTN_PIN_YES || (state & BTN_PIN_NO) == BTN_PIN_NO);
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if (firmware_present() && unpressed) {
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oledClear();
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oledDrawBitmap(40, 0, &bmp_logo64_empty);
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oledRefresh();
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uint8_t hash[32];
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if (!signatures_ok(hash)) {
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show_unofficial_warning(hash);
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}
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delay(100000);
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load_app();
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}
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#endif
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bootloader_loop();
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return 0;
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}
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