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trezor-firmware/core/embed/bootloader/main.c
Andrew Kozlik c2c1591f5c chore(core): Improve VTRUST bits documentation and naming. 
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2024-05-17 14:37:38 +02:00

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/*
* This file is part of the Trezor project, https://trezor.io/
*
* Copyright (c) SatoshiLabs
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <string.h>
#include <sys/types.h>
#include "boot_args.h"
#include "common.h"
#include "display.h"
#include "display_utils.h"
#include "fault_handlers.h"
#include "flash.h"
#include "flash_otp.h"
#include "image.h"
#include "lowlevel.h"
#include "messages.pb.h"
#include "random_delays.h"
#include "secbool.h"
#include "secret.h"
#ifdef USE_DMA2D
#include "dma2d.h"
#endif
#ifdef USE_I2C
#include "i2c.h"
#endif
#ifdef USE_OPTIGA
#include "optiga_hal.h"
#endif
#ifdef USE_TOUCH
#include "touch.h"
#endif
#ifdef USE_BUTTON
#include "button.h"
#endif
#ifdef USE_CONSUMPTION_MASK
#include "consumption_mask.h"
#endif
#ifdef USE_RGB_LED
#include "rgb_led.h"
#endif
#ifdef USE_HASH_PROCESSOR
#include "hash_processor.h"
#endif
#include "model.h"
#include "usb.h"
#include "version.h"
#include "bootui.h"
#include "messages.h"
#include "rust_ui.h"
#include "unit_variant.h"
#ifdef TREZOR_EMULATOR
#include "emulator.h"
#else
#include "compiler_traits.h"
#include "mpu.h"
#include "platform.h"
#endif
#define USB_IFACE_NUM 0
typedef enum {
SHUTDOWN = 0,
CONTINUE_TO_FIRMWARE = 0xAABBCCDD,
RETURN_TO_MENU = 0x55667788,
} usb_result_t;
void failed_jump_to_firmware(void);
CONFIDENTIAL volatile secbool dont_optimize_out_true = sectrue;
CONFIDENTIAL volatile void (*firmware_jump_fn)(void) = failed_jump_to_firmware;
static void usb_init_all(secbool usb21_landing) {
usb_dev_info_t dev_info = {
.device_class = 0x00,
.device_subclass = 0x00,
.device_protocol = 0x00,
.vendor_id = 0x1209,
.product_id = 0x53C0,
.release_num = 0x0200,
.manufacturer = MODEL_USB_MANUFACTURER,
.product = MODEL_USB_PRODUCT,
.serial_number = "000000000000000000000000",
.interface = "TREZOR Interface",
.usb21_enabled = sectrue,
.usb21_landing = usb21_landing,
};
static uint8_t rx_buffer[USB_PACKET_SIZE];
static const usb_webusb_info_t webusb_info = {
.iface_num = USB_IFACE_NUM,
#ifdef TREZOR_EMULATOR
.emu_port = 21324,
#else
.ep_in = USB_EP_DIR_IN | 0x01,
.ep_out = USB_EP_DIR_OUT | 0x01,
#endif
.subclass = 0,
.protocol = 0,
.max_packet_len = sizeof(rx_buffer),
.rx_buffer = rx_buffer,
.polling_interval = 1,
};
usb_init(&dev_info);
ensure(usb_webusb_add(&webusb_info), NULL);
usb_start();
}
static usb_result_t bootloader_usb_loop(const vendor_header *const vhdr,
const image_header *const hdr) {
// if both are NULL, we don't have a firmware installed
// let's show a webusb landing page in this case
usb_init_all((vhdr == NULL && hdr == NULL) ? sectrue : secfalse);
uint8_t buf[USB_PACKET_SIZE];
for (;;) {
#ifdef TREZOR_EMULATOR
emulator_poll_events();
#endif
int r = usb_webusb_read_blocking(USB_IFACE_NUM, buf, USB_PACKET_SIZE,
USB_TIMEOUT);
if (r != USB_PACKET_SIZE) {
continue;
}
uint16_t msg_id;
uint32_t msg_size;
uint32_t response;
if (sectrue != msg_parse_header(buf, &msg_id, &msg_size)) {
// invalid header -> discard
continue;
}
switch (msg_id) {
case MessageType_MessageType_Initialize:
process_msg_Initialize(USB_IFACE_NUM, msg_size, buf, vhdr, hdr);
break;
case MessageType_MessageType_Ping:
process_msg_Ping(USB_IFACE_NUM, msg_size, buf);
break;
case MessageType_MessageType_WipeDevice:
response = ui_screen_wipe_confirm();
if (INPUT_CANCEL == response) {
send_user_abort(USB_IFACE_NUM, "Wipe cancelled");
hal_delay(100);
usb_stop();
usb_deinit();
return RETURN_TO_MENU;
}
ui_screen_wipe();
r = process_msg_WipeDevice(USB_IFACE_NUM, msg_size, buf);
if (r < 0) { // error
screen_wipe_fail();
hal_delay(100);
usb_stop();
usb_deinit();
return SHUTDOWN;
} else { // success
screen_wipe_success();
hal_delay(100);
usb_stop();
usb_deinit();
return SHUTDOWN;
}
break;
case MessageType_MessageType_FirmwareErase:
process_msg_FirmwareErase(USB_IFACE_NUM, msg_size, buf);
break;
case MessageType_MessageType_FirmwareUpload:
r = process_msg_FirmwareUpload(USB_IFACE_NUM, msg_size, buf);
if (r < 0 && r != UPLOAD_ERR_USER_ABORT) { // error, but not user abort
if (r == UPLOAD_ERR_BOOTLOADER_LOCKED) {
secret_show_install_restricted_screen();
} else {
ui_screen_fail();
}
usb_stop();
usb_deinit();
return SHUTDOWN;
} else if (r == UPLOAD_ERR_USER_ABORT) {
hal_delay(100);
usb_stop();
usb_deinit();
return RETURN_TO_MENU;
} else if (r == 0) { // last chunk received
ui_screen_install_progress_upload(1000);
ui_screen_done(4, sectrue);
ui_screen_done(3, secfalse);
hal_delay(1000);
ui_screen_done(2, secfalse);
hal_delay(1000);
ui_screen_done(1, secfalse);
hal_delay(1000);
usb_stop();
usb_deinit();
return CONTINUE_TO_FIRMWARE;
}
break;
case MessageType_MessageType_GetFeatures:
process_msg_GetFeatures(USB_IFACE_NUM, msg_size, buf, vhdr, hdr);
break;
#if defined USE_OPTIGA && !defined STM32U5
case MessageType_MessageType_UnlockBootloader:
response = ui_screen_unlock_bootloader_confirm();
if (INPUT_CANCEL == response) {
send_user_abort(USB_IFACE_NUM, "Bootloader unlock cancelled");
hal_delay(100);
usb_stop();
usb_deinit();
return RETURN_TO_MENU;
}
process_msg_UnlockBootloader(USB_IFACE_NUM, msg_size, buf);
screen_unlock_bootloader_success();
hal_delay(100);
usb_stop();
usb_deinit();
return SHUTDOWN;
break;
#endif
default:
process_msg_unknown(USB_IFACE_NUM, msg_size, buf);
break;
}
}
}
static secbool check_vendor_header_lock(const vendor_header *const vhdr) {
uint8_t lock[FLASH_OTP_BLOCK_SIZE];
ensure(flash_otp_read(FLASH_OTP_BLOCK_VENDOR_HEADER_LOCK, 0, lock,
FLASH_OTP_BLOCK_SIZE),
NULL);
if (0 ==
memcmp(lock,
"\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF"
"\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF",
FLASH_OTP_BLOCK_SIZE)) {
return sectrue;
}
uint8_t hash[32];
vendor_header_hash(vhdr, hash);
return sectrue * (0 == memcmp(lock, hash, 32));
}
// protection against bootloader downgrade
#if PRODUCTION && !defined STM32U5
static void check_bootloader_version(void) {
uint8_t bits[FLASH_OTP_BLOCK_SIZE];
for (int i = 0; i < FLASH_OTP_BLOCK_SIZE * 8; i++) {
if (i < VERSION_MONOTONIC) {
bits[i / 8] &= ~(1 << (7 - (i % 8)));
} else {
bits[i / 8] |= (1 << (7 - (i % 8)));
}
}
ensure(flash_otp_write(FLASH_OTP_BLOCK_BOOTLOADER_VERSION, 0, bits,
FLASH_OTP_BLOCK_SIZE),
NULL);
uint8_t bits2[FLASH_OTP_BLOCK_SIZE];
ensure(flash_otp_read(FLASH_OTP_BLOCK_BOOTLOADER_VERSION, 0, bits2,
FLASH_OTP_BLOCK_SIZE),
NULL);
ensure(sectrue * (0 == memcmp(bits, bits2, FLASH_OTP_BLOCK_SIZE)),
"Bootloader downgrade protection");
}
#endif
void failed_jump_to_firmware(void) {
error_shutdown("INTERNAL ERROR", "(glitch)");
}
void real_jump_to_firmware(void) {
const image_header *hdr = NULL;
vendor_header vhdr = {0};
ensure(read_vendor_header((const uint8_t *)FIRMWARE_START, &vhdr),
"Firmware is corrupted");
ensure(check_vendor_header_keys(&vhdr), "Firmware is corrupted");
ensure(check_vendor_header_lock(&vhdr), "Unauthorized vendor keys");
hdr =
read_image_header((const uint8_t *)(size_t)(FIRMWARE_START + vhdr.hdrlen),
FIRMWARE_IMAGE_MAGIC, FIRMWARE_IMAGE_MAXSIZE);
ensure(hdr == (const image_header *)(size_t)(FIRMWARE_START + vhdr.hdrlen)
? sectrue
: secfalse,
"Firmware is corrupted");
ensure(check_image_model(hdr), "Wrong firmware model");
ensure(check_image_header_sig(hdr, vhdr.vsig_m, vhdr.vsig_n, vhdr.vpub),
"Firmware is corrupted");
ensure(check_image_contents(hdr, IMAGE_HEADER_SIZE + vhdr.hdrlen,
&FIRMWARE_AREA),
"Firmware is corrupted");
secret_prepare_fw(
((vhdr.vtrust & VTRUST_SECRET_MASK) == VTRUST_SECRET_ALLOW) * sectrue,
((vhdr.vtrust & VTRUST_NO_WARNING) == VTRUST_NO_WARNING) * sectrue);
// if all warnings are disabled in VTRUST flags then skip the procedure
if ((vhdr.vtrust & VTRUST_NO_WARNING) != VTRUST_NO_WARNING) {
ui_fadeout();
ui_screen_boot(&vhdr, hdr, 0);
ui_fadein();
// The delay is encoded in bitwise complement form.
int delay = (vhdr.vtrust & VTRUST_WAIT_MASK) ^ VTRUST_WAIT_MASK;
if (delay > 1) {
while (delay > 0) {
ui_screen_boot(&vhdr, hdr, delay);
hal_delay(1000);
delay--;
}
} else if (delay == 1) {
hal_delay(1000);
}
if ((vhdr.vtrust & VTRUST_NO_CLICK) == 0) {
ui_screen_boot(&vhdr, hdr, -1);
ui_click();
}
ui_screen_boot_stage_1(false);
}
display_finish_actions();
ensure_compatible_settings();
// mpu_config_firmware();
// jump_to_unprivileged(FIRMWARE_START + vhdr.hdrlen + IMAGE_HEADER_SIZE);
mpu_config_off();
jump_to(FIRMWARE_START + vhdr.hdrlen + IMAGE_HEADER_SIZE);
}
#ifdef STM32U5
__attribute__((noreturn)) void jump_to_fw_through_reset(void) {
display_finish_actions();
display_fade(display_backlight(-1), 0, 200);
__disable_irq();
delete_secrets();
NVIC_SystemReset();
for (;;)
;
}
#endif
#ifndef TREZOR_EMULATOR
int main(void) {
#else
int bootloader_main(void) {
#endif
secbool stay_in_bootloader = secfalse;
random_delays_init();
#if defined TREZOR_MODEL_T
set_core_clock(CLOCK_180_MHZ);
#endif
#ifdef USE_HASH_PROCESSOR
hash_processor_init();
#endif
#ifdef USE_I2C
i2c_init();
#endif
display_reinit();
#ifdef USE_DMA2D
dma2d_init();
#endif
unit_variant_init();
#ifdef USE_TOUCH
touch_power_on();
#ifdef TREZOR_MODEL_T3T1
// on T3T1, tester needs to run without touch, so making an exception
// until unit variant is written in OTP
if (unit_variant_present()) {
ensure(touch_init(), "Touch screen panel was not loaded properly.");
} else {
touch_init();
}
#else
ensure(touch_init(), "Touch screen panel was not loaded properly.");
#endif
#endif
ui_screen_boot_stage_1(false);
mpu_config_bootloader();
fault_handlers_init();
#ifdef TREZOR_EMULATOR
// wait a bit so that the empty lock icon is visible
// (on a real device, we are waiting for touch init which takes longer)
hal_delay(400);
#endif
const image_header *hdr = NULL;
vendor_header vhdr;
// detect whether the device contains a valid firmware
volatile secbool vhdr_present = secfalse;
volatile secbool vhdr_keys_ok = secfalse;
volatile secbool vhdr_lock_ok = secfalse;
volatile secbool img_hdr_ok = secfalse;
volatile secbool model_ok = secfalse;
volatile secbool header_present = secfalse;
volatile secbool firmware_present = secfalse;
volatile secbool firmware_present_backup = secfalse;
volatile secbool auto_upgrade = secfalse;
vhdr_present = read_vendor_header((const uint8_t *)FIRMWARE_START, &vhdr);
if (sectrue == vhdr_present) {
vhdr_keys_ok = check_vendor_header_keys(&vhdr);
}
if (sectrue == vhdr_keys_ok) {
vhdr_lock_ok = check_vendor_header_lock(&vhdr);
}
if (sectrue == vhdr_lock_ok) {
hdr = read_image_header(
(const uint8_t *)(size_t)(FIRMWARE_START + vhdr.hdrlen),
FIRMWARE_IMAGE_MAGIC, FIRMWARE_IMAGE_MAXSIZE);
if (hdr == (const image_header *)(size_t)(FIRMWARE_START + vhdr.hdrlen)) {
img_hdr_ok = sectrue;
}
}
if (sectrue == img_hdr_ok) {
model_ok = check_image_model(hdr);
}
if (sectrue == model_ok) {
header_present =
check_image_header_sig(hdr, vhdr.vsig_m, vhdr.vsig_n, vhdr.vpub);
}
if (sectrue == header_present) {
firmware_present = check_image_contents(
hdr, IMAGE_HEADER_SIZE + vhdr.hdrlen, &FIRMWARE_AREA);
firmware_present_backup = firmware_present;
}
#ifdef USE_OPTIGA
optiga_hal_init();
#endif
#ifdef USE_BUTTON
button_init();
#endif
#ifdef USE_CONSUMPTION_MASK
consumption_mask_init();
#endif
#ifdef USE_RGB_LED
rgb_led_init();
#endif
#if PRODUCTION && !defined STM32U5
// for STM32U5, this check is moved to boardloader
check_bootloader_version();
#endif
switch (bootargs_get_command()) {
case BOOT_COMMAND_STOP_AND_WAIT:
// firmare requested to stay in bootloader
stay_in_bootloader = sectrue;
break;
case BOOT_COMMAND_INSTALL_UPGRADE:
if (firmware_present == sectrue) {
// continue without user interaction
auto_upgrade = sectrue;
}
break;
default:
break;
}
ensure(dont_optimize_out_true * (firmware_present == firmware_present_backup),
NULL);
// delay to detect touch or skip if we know we are staying in bootloader
// anyway
uint32_t touched = 0;
#ifdef USE_TOUCH
if (firmware_present == sectrue && stay_in_bootloader != sectrue) {
touch_wait_until_ready();
for (int i = 0; i < 10; i++) {
touched = touch_is_detected() | touch_read();
if (touched) {
break;
}
#ifdef TREZOR_EMULATOR
hal_delay(25);
#else
hal_delay_us(1000);
#endif
}
}
#elif defined USE_BUTTON
button_read();
if (button_state_left() == 1) {
touched = 1;
}
#endif
ensure(dont_optimize_out_true * (firmware_present == firmware_present_backup),
NULL);
// start the bootloader ...
// ... if user touched the screen on start
// ... or we have stay_in_bootloader flag to force it
// ... or strict upgrade was confirmed in the firmware (auto_upgrade flag)
// ... or there is no valid firmware
if (touched || stay_in_bootloader == sectrue || firmware_present != sectrue ||
auto_upgrade == sectrue) {
screen_t screen;
ui_set_initial_setup(true);
if (header_present == sectrue) {
if (auto_upgrade == sectrue) {
screen = SCREEN_WAIT_FOR_HOST;
} else {
ui_set_initial_setup(false);
screen = SCREEN_INTRO;
}
} else {
screen = SCREEN_WELCOME;
#ifdef STM32U5
secret_bhk_regenerate();
#endif
// erase storage
ensure(flash_area_erase_bulk(STORAGE_AREAS, STORAGE_AREAS_COUNT, NULL),
NULL);
// keep the model screen up for a while
#ifndef USE_BACKLIGHT
hal_delay(1500);
#else
// backlight fading takes some time so the explicit delay here is
// shorter
hal_delay(1000);
#endif
}
while (true) {
volatile secbool continue_to_firmware = secfalse;
volatile secbool continue_to_firmware_backup = secfalse;
uint32_t ui_result = 0;
switch (screen) {
case SCREEN_WELCOME:
ui_screen_welcome();
// and start the usb loop
switch (bootloader_usb_loop(NULL, NULL)) {
case CONTINUE_TO_FIRMWARE:
continue_to_firmware = sectrue;
continue_to_firmware_backup = sectrue;
break;
case RETURN_TO_MENU:
break;
default:
case SHUTDOWN:
return 1;
break;
}
break;
case SCREEN_INTRO:
ui_result = ui_screen_intro(&vhdr, hdr, firmware_present);
if (ui_result == 1) {
screen = SCREEN_MENU;
}
if (ui_result == 2) {
screen = SCREEN_WAIT_FOR_HOST;
}
break;
case SCREEN_MENU:
ui_result = ui_screen_menu(firmware_present);
if (ui_result == 0xAABBCCDD) { // exit menu
screen = SCREEN_INTRO;
}
if (ui_result == 0x11223344) { // reboot
#ifndef STM32U5
ui_screen_boot_stage_1(true);
#endif
continue_to_firmware = firmware_present;
continue_to_firmware_backup = firmware_present_backup;
}
if (ui_result == 0x55667788) { // wipe
screen = SCREEN_WIPE_CONFIRM;
}
break;
case SCREEN_WIPE_CONFIRM:
ui_result = screen_wipe_confirm();
if (ui_result == INPUT_CANCEL) {
// canceled
screen = SCREEN_MENU;
}
if (ui_result == INPUT_CONFIRM) {
ui_screen_wipe();
secbool r = bootloader_WipeDevice();
if (r != sectrue) { // error
screen_wipe_fail();
return 1;
} else { // success
screen_wipe_success();
return 1;
}
}
break;
case SCREEN_WAIT_FOR_HOST:
screen_connect(auto_upgrade == sectrue);
switch (bootloader_usb_loop(&vhdr, hdr)) {
case CONTINUE_TO_FIRMWARE:
continue_to_firmware = sectrue;
continue_to_firmware_backup = sectrue;
break;
case RETURN_TO_MENU:
screen = SCREEN_INTRO;
break;
case SHUTDOWN:
return 1;
break;
default:
break;
}
break;
default:
break;
}
if (continue_to_firmware != continue_to_firmware_backup) {
// erase storage if we saw flips randomly flip, most likely due to
// glitch
#ifdef STM32U5
secret_bhk_regenerate();
#endif
ensure(flash_area_erase_bulk(STORAGE_AREAS, STORAGE_AREAS_COUNT, NULL),
NULL);
}
ensure(dont_optimize_out_true *
(continue_to_firmware == continue_to_firmware_backup),
NULL);
if (sectrue == continue_to_firmware) {
#ifdef STM32U5
firmware_jump_fn = jump_to_fw_through_reset;
#else
ui_screen_boot_stage_1(true);
firmware_jump_fn = real_jump_to_firmware;
#endif
break;
}
}
}
ensure(dont_optimize_out_true * (firmware_present == firmware_present_backup),
NULL);
#ifdef STM32U5
if (sectrue == firmware_present &&
firmware_jump_fn != jump_to_fw_through_reset) {
firmware_jump_fn = real_jump_to_firmware;
}
#else
if (sectrue == firmware_present) {
firmware_jump_fn = real_jump_to_firmware;
}
#endif
firmware_jump_fn();
return 0;
}
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