mirror of
https://github.com/trezor/trezor-firmware.git
synced 2024-10-31 20:39:48 +00:00
169 lines
4.8 KiB
C
169 lines
4.8 KiB
C
/*
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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/cm3/scb.h>
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#include <libopencm3/stm32/gpio.h>
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#include <libopencm3/stm32/rcc.h>
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#include "bootloader.h"
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#include "buttons.h"
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#include "layout.h"
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#include "memory.h"
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#include "oled.h"
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#include "rng.h"
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#include "setup.h"
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#include "signatures.h"
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#include "supervise.h"
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#include "usb.h"
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#include "util.h"
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void layoutFirmwareFingerprint(const uint8_t *hash) {
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char str[4][17] = {0};
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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",
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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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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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void show_halt(const char *line1, const char *line2) {
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layoutDialog(&bmp_icon_error, NULL, NULL, NULL, line1, line2, NULL,
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"Unplug your Trezor,", "reinstall firmware.", NULL);
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shutdown();
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}
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void show_unplug(const char *line1, const char *line2) {
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layoutDialog(&bmp_icon_ok, NULL, NULL, NULL, line1, line2, NULL,
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"You may now", "unplug your Trezor.", NULL);
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}
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static void show_unofficial_warning(const uint8_t *hash) {
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layoutDialog(&bmp_icon_warning, "Abort", "I'll take the risk", NULL,
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"WARNING!", NULL, "Unofficial firmware", "detected.", NULL,
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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("Unofficial firmware", "aborted.");
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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("Unofficial firmware", "aborted.");
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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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// 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),
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signed_firmware);
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}
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static void bootloader_loop(void) {
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oledClear();
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oledDrawBitmap(0, 0, &bmp_logo64_half);
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oledDrawBitmapFlip(24, 0, &bmp_logo64_half);
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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,
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VERSTR(VERSION_MAJOR) "." VERSTR(
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VERSION_MINOR) "." VERSTR(VERSION_PATCH),
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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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// grab "stay in bootloader" flag as soon as possible
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register uint32_t r11 __asm__("r11");
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volatile uint32_t stay_in_bootloader_flag = r11;
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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
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// 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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if (stay_in_bootloader_flag == STAY_IN_BOOTLOADER_FLAG) {
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goto bootloader_loop_start;
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}
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#ifndef APPVER
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bool left_pressed = (buttonRead() & BTN_PIN_NO) == 0;
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if (firmware_present_new() && !left_pressed) {
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oledClear();
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oledDrawBitmap(40, 0, &bmp_logo64_empty_half);
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oledDrawBitmapFlip(40 + 24, 0, &bmp_logo64_empty_half);
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oledRefresh();
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const image_header *hdr =
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(const image_header *)FLASH_PTR(FLASH_FWHEADER_START);
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uint8_t fingerprint[32] = {0};
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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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}
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if (SIG_OK != check_firmware_hashes(hdr)) {
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show_halt("Broken firmware", "detected.");
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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_start:
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bootloader_loop();
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return 0;
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}
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