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155 lines
4.1 KiB
155 lines
4.1 KiB
/*
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* This file is part of the TREZOR project, https://trezor.io/
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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 "signatures.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 "rng.h"
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#include "timer.h"
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#include "memory.h"
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void layoutFirmwareFingerprint(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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bool get_button_response(void)
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{
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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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return button.YesUp;
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}
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static 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,", "reinstall firmware.", NULL);
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shutdown();
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}
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static 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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bool but = get_button_response();
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if (!but) { // no button was pressed -> halt
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show_halt();
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}
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layoutFirmwareFingerprint(hash);
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but = get_button_response();
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if (!but) { // no button was pressed -> halt
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show_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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static void __attribute__((noreturn)) load_app(int signed_firmware)
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{
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// zero out SRAM
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memset_reg(_ram_start, _ram_end, 0);
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jump_to_firmware((const vector_table_t *) FLASH_PTR(FLASH_APP_START), signed_firmware);
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}
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static 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_new()) {
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oledDrawStringCenter(90, 10, "TREZOR", FONT_STANDARD);
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oledDrawStringCenter(90, 30, "Bootloader", FONT_STANDARD);
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oledDrawStringCenter(90, 50, VERSTR(VERSION_MAJOR) "." VERSTR(VERSION_MINOR) "." VERSTR(VERSION_PATCH), FONT_STANDARD);
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} else {
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oledDrawStringCenter(90, 10, "Welcome!", FONT_STANDARD);
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oledDrawStringCenter(90, 30, "Please visit", FONT_STANDARD);
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oledDrawStringCenter(90, 50, "trezor.io/start", FONT_STANDARD);
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}
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oledRefresh();
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usbLoop();
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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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mpu_config_bootloader();
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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_new() && 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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const image_header *hdr = (const image_header *)FLASH_PTR(FLASH_FWHEADER_START);
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uint8_t fingerprint[32];
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int signed_firmware = signatures_new_ok(hdr, fingerprint);
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if (SIG_OK != signed_firmware) {
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show_unofficial_warning(fingerprint);
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timer_init();
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}
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if (SIG_OK != check_firmware_hashes(hdr)) {
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layoutDialog(&bmp_icon_error, NULL, NULL, NULL, "Broken firmware", "detected.", NULL, "Unplug your TREZOR,", "reinstall firmware.", NULL);
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shutdown();
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}
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mpu_config_off();
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load_app(signed_firmware);
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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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