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trezor-firmware/core/embed/bootloader_ci/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 "flash_otp.h"
#include "image.h"
#include "mini_printf.h"
#include "mpu.h"
#include "random_delays.h"
#include "rng.h"
#include "secbool.h"
#ifdef USE_TOUCH
#include "touch.h"
#endif
#include "usb.h"
#include "version.h"
#include "bootui.h"
#include "messages.h"
#include "model.h"
#ifdef USE_HASH_PROCESSOR
#include "hash_processor.h"
#endif
// #include "mpu.h"
#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_screen_wipe();
r = process_msg_WipeDevice(USB_IFACE_NUM, msg_size, buf);
if (r < 0) { // error
ui_screen_fail();
usb_stop();
usb_deinit();
return secfalse; // shutdown
} else { // success
ui_screen_done(0, sectrue);
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 != UPLOAD_ERR_USER_ABORT) { // error, but not user abort
ui_screen_fail();
usb_stop();
usb_deinit();
return secfalse; // shutdown
} 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 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;
}
}
}
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
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) {
random_delays_init();
#ifdef USE_TOUCH
touch_init();
touch_power_on();
#endif
#ifdef USE_HASH_PROCESSOR
hash_processor_init();
#endif
mpu_config_bootloader();
#if PRODUCTION
check_bootloader_version();
#endif
display_clear();
const image_header *hdr = NULL;
vendor_header vhdr;
// detect whether the device contains a valid firmware
secbool firmware_present = sectrue;
if (sectrue != read_vendor_header((const uint8_t *)FIRMWARE_START, &vhdr)) {
firmware_present = secfalse;
}
if (sectrue == firmware_present) {
firmware_present = check_vendor_header_keys(&vhdr);
}
if (sectrue == firmware_present) {
firmware_present = check_vendor_header_lock(&vhdr);
}
if (sectrue == firmware_present) {
hdr = read_image_header((const uint8_t *)(FIRMWARE_START + vhdr.hdrlen),
FIRMWARE_IMAGE_MAGIC, FIRMWARE_IMAGE_MAXSIZE);
if (hdr != (const image_header *)(FIRMWARE_START + vhdr.hdrlen)) {
firmware_present = secfalse;
}
}
if (sectrue == firmware_present) {
firmware_present = check_image_model(hdr);
}
if (sectrue == firmware_present) {
firmware_present =
check_image_header_sig(hdr, vhdr.vsig_m, vhdr.vsig_n, vhdr.vpub);
}
if (sectrue == firmware_present) {
firmware_present = check_image_contents(
hdr, IMAGE_HEADER_SIZE + vhdr.hdrlen, &FIRMWARE_AREA);
}
// always start bootloader even if firmware is already present
// show intro animation
// no ui_fadeout(); - we already start from black screen
ui_screen_welcome_third();
ui_fadein();
// and start the usb loop
if (bootloader_usb_loop(NULL, NULL) != sectrue) {
return 1;
}
ensure(read_vendor_header((const uint8_t *)FIRMWARE_START, &vhdr),
"invalid vendor header");
ensure(check_vendor_header_keys(&vhdr), "invalid vendor header signature");
ensure(check_vendor_header_lock(&vhdr), "unauthorized vendor keys");
hdr = read_image_header((const uint8_t *)(FIRMWARE_START + vhdr.hdrlen),
FIRMWARE_IMAGE_MAGIC, FIRMWARE_IMAGE_MAXSIZE);
ensure(hdr == (const image_header *)(FIRMWARE_START + vhdr.hdrlen) ? sectrue
: secfalse,
"invalid firmware header");
ensure(check_image_model(hdr), "wrong firmware model");
ensure(check_image_header_sig(hdr, vhdr.vsig_m, vhdr.vsig_n, vhdr.vpub),
"invalid firmware signature");
ensure(check_image_contents(hdr, IMAGE_HEADER_SIZE + vhdr.hdrlen,
&FIRMWARE_AREA),
"invalid firmware hash");
// do not check any trust flags on header, proceed
// 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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