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trezor-firmware/legacy/bootloader/bootloader.c
2021-09-27 15:42:29 +02:00

170 lines
4.8 KiB
C

/*
* This file is part of the Trezor project, https://trezor.io/
*
* Copyright (C) 2014 Pavol Rusnak <stick@satoshilabs.com>
*
* This library is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
#include <string.h>
#include <libopencm3/cm3/scb.h>
#include <libopencm3/stm32/gpio.h>
#include <libopencm3/stm32/rcc.h>
#include "bootloader.h"
#include "buttons.h"
#include "compiler_traits.h"
#include "layout.h"
#include "memory.h"
#include "oled.h"
#include "rng.h"
#include "setup.h"
#include "signatures.h"
#include "supervise.h"
#include "usb.h"
#include "util.h"
void layoutFirmwareFingerprint(const uint8_t *hash) {
char str[4][17] = {0};
for (int i = 0; i < 4; i++) {
data2hex(hash + i * 8, 8, str[i]);
}
layoutDialog(&bmp_icon_question, "Abort", "Continue", "Compare fingerprints",
str[0], str[1], str[2], str[3], NULL, NULL);
}
bool get_button_response(void) {
do {
delay(100000);
buttonUpdate();
} while (!button.YesUp && !button.NoUp);
return button.YesUp;
}
void show_halt(const char *line1, const char *line2) {
layoutDialog(&bmp_icon_error, NULL, NULL, NULL, line1, line2, NULL,
"Unplug your Trezor,", "reinstall firmware.", NULL);
shutdown();
}
void show_unplug(const char *line1, const char *line2) {
layoutDialog(&bmp_icon_ok, NULL, NULL, NULL, line1, line2, NULL,
"You may now", "unplug your Trezor.", NULL);
}
static void show_unofficial_warning(const uint8_t *hash) {
layoutDialog(&bmp_icon_warning, "Abort", "I'll take the risk", NULL,
"WARNING!", NULL, "Unofficial firmware", "detected.", NULL,
NULL);
bool but = get_button_response();
if (!but) { // no button was pressed -> halt
show_halt("Unofficial firmware", "aborted.");
}
layoutFirmwareFingerprint(hash);
but = get_button_response();
if (!but) { // no button was pressed -> halt
show_halt("Unofficial firmware", "aborted.");
}
// everything is OK, user pressed 2x Continue -> continue program
}
static void __attribute__((noreturn)) load_app(int signed_firmware) {
// zero out SRAM
memset_reg(_ram_start, _ram_end, 0);
jump_to_firmware((const vector_table_t *)FLASH_PTR(FLASH_APP_START),
signed_firmware);
}
static void bootloader_loop(void) {
oledClear();
oledDrawBitmap(0, 0, &bmp_logo64_half);
oledDrawBitmapFlip(24, 0, &bmp_logo64_half);
if (firmware_present_new()) {
oledDrawStringCenter(90, 10, "Trezor", FONT_STANDARD);
oledDrawStringCenter(90, 30, "Bootloader", FONT_STANDARD);
oledDrawStringCenter(90, 50,
VERSTR(VERSION_MAJOR) "." VERSTR(
VERSION_MINOR) "." VERSTR(VERSION_PATCH),
FONT_STANDARD);
} else {
oledDrawStringCenter(90, 10, "Welcome!", FONT_STANDARD);
oledDrawStringCenter(90, 30, "Please visit", FONT_STANDARD);
oledDrawStringCenter(90, 50, "trezor.io/start", FONT_STANDARD);
}
oledRefresh();
usbLoop();
}
int main(void) {
// grab "stay in bootloader" flag as soon as possible
register uint32_t r11 __asm__("r11");
volatile uint32_t stay_in_bootloader_flag = r11;
#ifndef APPVER
setup();
#endif
__stack_chk_guard = random32(); // this supports compiler provided
// unpredictable stack protection checks
#ifndef APPVER
memory_protect();
oledInit();
#endif
mpu_config_bootloader();
if (stay_in_bootloader_flag == STAY_IN_BOOTLOADER_FLAG) {
goto bootloader_loop_start;
}
#ifndef APPVER
bool left_pressed = (buttonRead() & BTN_PIN_NO) == 0;
if (firmware_present_new() && !left_pressed) {
oledClear();
oledDrawBitmap(40, 0, &bmp_logo64_empty_half);
oledDrawBitmapFlip(40 + 24, 0, &bmp_logo64_empty_half);
oledRefresh();
const image_header *hdr =
(const image_header *)FLASH_PTR(FLASH_FWHEADER_START);
uint8_t fingerprint[32] = {0};
int signed_firmware = signatures_new_ok(hdr, fingerprint);
if (SIG_OK != signed_firmware) {
show_unofficial_warning(fingerprint);
}
if (SIG_OK != check_firmware_hashes(hdr)) {
show_halt("Broken firmware", "detected.");
}
mpu_config_off();
load_app(signed_firmware);
}
#endif
bootloader_loop_start:
bootloader_loop();
return 0;
}