arno/trezor-firmware
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trezor-firmware/core/embed/bootloader/main.c

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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 "common.h"
#include "display.h"
#include "flash.h"
#include "image.h"
#include "mini_printf.h"
#include "mpu.h"
#include "rng.h"
#include "secbool.h"
#include "touch.h"
#include "usb.h"
#include "version.h"
#include "bootui.h"
#include "messages.h"
// #include "mpu.h"
const uint8_t BOOTLOADER_KEY_M = 2;
const uint8_t BOOTLOADER_KEY_N = 3;
static const uint8_t * const BOOTLOADER_KEYS[] = {
(const uint8_t *)"\xc2\xc8\x7a\x49\xc5\xa3\x46\x09\x77\xfb\xb2\xec\x9d\xfe\x60\xf0\x6b\xd6\x94\xdb\x82\x44\xbd\x49\x81\xfe\x3b\x7a\x26\x30\x7f\x3f",
(const uint8_t *)"\x80\xd0\x36\xb0\x87\x39\xb8\x46\xf4\xcb\x77\x59\x30\x78\xde\xb2\x5d\xc9\x48\x7a\xed\xcf\x52\xe3\x0b\x4f\xb7\xcd\x70\x24\x17\x8a",
(const uint8_t *)"\xb8\x30\x7a\x71\xf5\x52\xc6\x0a\x4c\xbb\x31\x7f\xf4\x8b\x82\xcd\xbf\x6b\x6b\xb5\xf0\x4c\x92\x0f\xec\x7b\xad\xf0\x17\x88\x37\x51",
// comment the lines above and uncomment the lines below to use a custom signed vendorheader
// (const uint8_t *)"\xd7\x59\x79\x3b\xbc\x13\xa2\x81\x9a\x82\x7c\x76\xad\xb6\xfb\xa8\xa4\x9a\xee\x00\x7f\x49\xf2\xd0\x99\x2d\x99\xb8\x25\xad\x2c\x48",
// (const uint8_t *)"\x63\x55\x69\x1c\x17\x8a\x8f\xf9\x10\x07\xa7\x47\x8a\xfb\x95\x5e\xf7\x35\x2c\x63\xe7\xb2\x57\x03\x98\x4c\xf7\x8b\x26\xe2\x1a\x56",
// (const uint8_t *)"\xee\x93\xa4\xf6\x6f\x8d\x16\xb8\x19\xbb\x9b\xeb\x9f\xfc\xcd\xfc\xdc\x14\x12\xe8\x7f\xee\x6a\x32\x4c\x2a\x99\xa1\xe0\xe6\x71\x48",
};
#define USB_IFACE_NUM 0
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 = "SatoshiLabs",
.product = "TREZOR",
.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,
.ep_in = USB_EP_DIR_IN | 0x01,
.ep_out = USB_EP_DIR_OUT | 0x01,
.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 secbool 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 (;;) {
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;
if (sectrue != msg_parse_header(buf, &msg_id, &msg_size)) {
// invalid header -> discard
continue;
}
switch (msg_id) {
case 0: // Initialize
process_msg_Initialize(USB_IFACE_NUM, msg_size, buf, vhdr, hdr);
break;
case 1: // Ping
process_msg_Ping(USB_IFACE_NUM, msg_size, buf);
break;
case 5: // WipeDevice
ui_fadeout();
ui_screen_wipe_confirm();
ui_fadein();
int response = ui_user_input(INPUT_CONFIRM | INPUT_CANCEL);
if (INPUT_CANCEL == response) {
ui_fadeout();
ui_screen_firmware_info(vhdr, hdr);
ui_fadein();
send_user_abort(USB_IFACE_NUM, "Wipe cancelled");
break;
}
ui_fadeout();
ui_screen_wipe();
ui_fadein();
r = process_msg_WipeDevice(USB_IFACE_NUM, msg_size, buf);
if (r < 0) { // error
ui_fadeout();
ui_screen_fail();
ui_fadein();
usb_stop();
usb_deinit();
return secfalse; // shutdown
} else { // success
ui_fadeout();
ui_screen_done(0, sectrue);
ui_fadein();
usb_stop();
usb_deinit();
return secfalse; // shutdown
}
break;
case 6: // FirmwareErase
process_msg_FirmwareErase(USB_IFACE_NUM, msg_size, buf);
break;
case 7: // FirmwareUpload
r = process_msg_FirmwareUpload(USB_IFACE_NUM, msg_size, buf);
if (r < 0 && r != -4) { // error, but not user abort (-4)
ui_fadeout();
ui_screen_fail();
ui_fadein();
usb_stop();
usb_deinit();
return secfalse; // shutdown
} else if (r == 0) { // last chunk received
ui_screen_install_progress_upload(1000);
ui_fadeout();
ui_screen_done(4, sectrue);
ui_fadein();
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();
ui_fadeout();
return sectrue; // jump to firmware
}
break;
case 55: // GetFeatures
process_msg_GetFeatures(USB_IFACE_NUM, msg_size, buf, vhdr, hdr);
break;
default:
process_msg_unknown(USB_IFACE_NUM, msg_size, buf);
break;
}
}
}
secbool load_vendor_header_keys(const uint8_t *const data,
vendor_header *const vhdr) {
return load_vendor_header(data, BOOTLOADER_KEY_M, BOOTLOADER_KEY_N,
BOOTLOADER_KEYS, vhdr);
}
static secbool check_vendor_keys_lock(const vendor_header *const vhdr) {
uint8_t lock[FLASH_OTP_BLOCK_SIZE];
ensure(flash_otp_read(FLASH_OTP_BLOCK_VENDOR_KEYS_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_keys_hash(vhdr, hash);
return sectrue * (0 == memcmp(lock, hash, 32));
}
// protection against bootloader downgrade
#if PRODUCTION
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 downgraded");
}
#endif
int main(void) {
drbg_init();
// display_init_seq();
touch_init();
touch_power_on();
mpu_config_bootloader();
#if PRODUCTION
check_bootloader_version();
#endif
display_clear();
// delay to detect touch
uint32_t touched = 0;
for (int i = 0; i < 100; i++) {
touched = touch_is_detected() | touch_read();
if (touched) {
break;
}
hal_delay(1);
}
vendor_header vhdr;
image_header hdr;
secbool stay_in_bootloader = secfalse; // flag to stay in bootloader
// detect whether the devices contains a valid firmware
secbool firmware_present =
load_vendor_header_keys((const uint8_t *)FIRMWARE_START, &vhdr);
if (sectrue == firmware_present) {
firmware_present = check_vendor_keys_lock(&vhdr);
}
if (sectrue == firmware_present) {
firmware_present = load_image_header(
(const uint8_t *)(FIRMWARE_START + vhdr.hdrlen), FIRMWARE_IMAGE_MAGIC,
FIRMWARE_IMAGE_MAXSIZE, vhdr.vsig_m, vhdr.vsig_n, vhdr.vpub, &hdr);
}
if (sectrue == firmware_present) {
firmware_present =
check_image_contents(&hdr, IMAGE_HEADER_SIZE + vhdr.hdrlen,
FIRMWARE_SECTORS, FIRMWARE_SECTORS_COUNT);
}
// start the bootloader if no or broken firmware found ...
if (firmware_present != sectrue) {
// show intro animation
// no ui_fadeout(); - we already start from black screen
ui_screen_welcome_first();
ui_fadein();
hal_delay(1000);
ui_fadeout();
ui_screen_welcome_second();
ui_fadein();
hal_delay(1000);
ui_fadeout();
ui_screen_welcome_third();
ui_fadein();
// erase storage
ensure(flash_erase_sectors(STORAGE_SECTORS, STORAGE_SECTORS_COUNT, NULL),
NULL);
// and start the usb loop
if (bootloader_usb_loop(NULL, NULL) != sectrue) {
return 1;
}
}
// ... or if user touched the screen on start
// ... or we have stay_in_bootloader flag to force it
if (touched || stay_in_bootloader == sectrue) {
// no ui_fadeout(); - we already start from black screen
ui_screen_firmware_info(&vhdr, &hdr);
ui_fadein();
// and start the usb loop
if (bootloader_usb_loop(&vhdr, &hdr) != sectrue) {
return 1;
}
}
ensure(load_vendor_header_keys((const uint8_t *)FIRMWARE_START, &vhdr),
"invalid vendor header");
ensure(check_vendor_keys_lock(&vhdr), "unauthorized vendor keys");
ensure(load_image_header((const uint8_t *)(FIRMWARE_START + vhdr.hdrlen),
FIRMWARE_IMAGE_MAGIC, FIRMWARE_IMAGE_MAXSIZE,
vhdr.vsig_m, vhdr.vsig_n, vhdr.vpub, &hdr),
"invalid firmware header");
ensure(check_image_contents(&hdr, IMAGE_HEADER_SIZE + vhdr.hdrlen,
FIRMWARE_SECTORS, FIRMWARE_SECTORS_COUNT),
"invalid firmware hash");
// if all VTRUST flags are unset = ultimate trust => skip the procedure
if ((vhdr.vtrust & VTRUST_ALL) != VTRUST_ALL) {
// ui_fadeout(); // no fadeout - we start from black screen
ui_screen_boot(&vhdr, &hdr);
ui_fadein();
int delay = (vhdr.vtrust & VTRUST_WAIT) ^ VTRUST_WAIT;
if (delay > 1) {
while (delay > 0) {
ui_screen_boot_wait(delay);
hal_delay(1000);
delay--;
}
} else if (delay == 1) {
hal_delay(1000);
}
if ((vhdr.vtrust & VTRUST_CLICK) == 0) {
ui_screen_boot_click();
touch_click();
}
ui_fadeout();
}
// 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);
return 0;
}
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