mirror of
https://github.com/trezor/trezor-firmware.git
synced 2024-12-22 14:28:07 +00:00
286 lines
9.1 KiB
C
286 lines
9.1 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) SatoshiLabs
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU 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 program 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 General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <string.h>
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#include <sys/types.h>
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#include "common.h"
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#include "display.h"
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#include "flash.h"
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#include "image.h"
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#include "mini_printf.h"
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#include "mpu.h"
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#include "rng.h"
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#include "secbool.h"
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#include "touch.h"
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#include "usb.h"
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#include "version.h"
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#include "bootui.h"
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#include "messages.h"
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// #include "mpu.h"
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const uint8_t BOOTLOADER_KEY_M = 2;
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const uint8_t BOOTLOADER_KEY_N = 3;
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static const uint8_t * const BOOTLOADER_KEYS[] = {
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(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",
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(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",
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(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",
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// comment the lines above and uncomment the lines below to use a custom signed vendorheader
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// (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",
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// (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",
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// (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",
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};
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#define USB_IFACE_NUM 0
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static void usb_init_all(secbool usb21_landing) {
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usb_dev_info_t dev_info = {
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.device_class = 0x00,
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.device_subclass = 0x00,
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.device_protocol = 0x00,
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.vendor_id = 0x1209,
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.product_id = 0x53C0,
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.release_num = 0x0200,
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.manufacturer = "SatoshiLabs",
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.product = "TREZOR",
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.serial_number = "000000000000000000000000",
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.interface = "TREZOR Interface",
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.usb21_enabled = sectrue,
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.usb21_landing = usb21_landing,
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};
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static uint8_t rx_buffer[USB_PACKET_SIZE];
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static const usb_webusb_info_t webusb_info = {
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.iface_num = USB_IFACE_NUM,
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.ep_in = USB_EP_DIR_IN | 0x01,
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.ep_out = USB_EP_DIR_OUT | 0x01,
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.subclass = 0,
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.protocol = 0,
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.max_packet_len = sizeof(rx_buffer),
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.rx_buffer = rx_buffer,
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.polling_interval = 1,
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};
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usb_init(&dev_info);
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ensure(usb_webusb_add(&webusb_info), NULL);
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usb_start();
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}
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static secbool bootloader_usb_loop(const vendor_header *const vhdr,
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const image_header *const hdr) {
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// if both are NULL, we don't have a firmware installed
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// let's show a webusb landing page in this case
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usb_init_all((vhdr == NULL && hdr == NULL) ? sectrue : secfalse);
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uint8_t buf[USB_PACKET_SIZE];
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for (;;) {
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int r = usb_webusb_read_blocking(USB_IFACE_NUM, buf, USB_PACKET_SIZE,
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USB_TIMEOUT);
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if (r != USB_PACKET_SIZE) {
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continue;
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}
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uint16_t msg_id;
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uint32_t msg_size;
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if (sectrue != msg_parse_header(buf, &msg_id, &msg_size)) {
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// invalid header -> discard
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continue;
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}
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switch (msg_id) {
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case 0: // Initialize
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process_msg_Initialize(USB_IFACE_NUM, msg_size, buf, vhdr, hdr);
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break;
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case 1: // Ping
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process_msg_Ping(USB_IFACE_NUM, msg_size, buf);
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break;
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case 5: // WipeDevice
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ui_screen_wipe();
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r = process_msg_WipeDevice(USB_IFACE_NUM, msg_size, buf);
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if (r < 0) { // error
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ui_screen_fail();
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usb_stop();
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usb_deinit();
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return secfalse; // shutdown
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} else { // success
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ui_screen_done(0, sectrue);
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usb_stop();
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usb_deinit();
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return secfalse; // shutdown
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}
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break;
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case 6: // FirmwareErase
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process_msg_FirmwareErase(USB_IFACE_NUM, msg_size, buf);
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break;
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case 7: // FirmwareUpload
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r = process_msg_FirmwareUpload(USB_IFACE_NUM, msg_size, buf);
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if (r < 0 && r != -4) { // error, but not user abort (-4)
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ui_screen_fail();
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usb_stop();
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usb_deinit();
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return secfalse; // shutdown
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} else if (r == 0) { // last chunk received
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ui_screen_install_progress_upload(1000);
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ui_screen_done(4, sectrue);
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ui_screen_done(3, secfalse);
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hal_delay(1000);
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ui_screen_done(2, secfalse);
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hal_delay(1000);
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ui_screen_done(1, secfalse);
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hal_delay(1000);
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usb_stop();
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usb_deinit();
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return sectrue; // jump to firmware
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}
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break;
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case 55: // GetFeatures
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process_msg_GetFeatures(USB_IFACE_NUM, msg_size, buf, vhdr, hdr);
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break;
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default:
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process_msg_unknown(USB_IFACE_NUM, msg_size, buf);
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break;
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}
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}
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}
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secbool load_vendor_header_keys(const uint8_t *const data,
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vendor_header *const vhdr) {
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return load_vendor_header(data, BOOTLOADER_KEY_M, BOOTLOADER_KEY_N,
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BOOTLOADER_KEYS, vhdr);
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}
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static secbool check_vendor_keys_lock(const vendor_header *const vhdr) {
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uint8_t lock[FLASH_OTP_BLOCK_SIZE];
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ensure(flash_otp_read(FLASH_OTP_BLOCK_VENDOR_KEYS_LOCK, 0, lock,
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FLASH_OTP_BLOCK_SIZE),
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NULL);
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if (0 ==
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memcmp(lock,
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"\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF"
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"\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF",
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FLASH_OTP_BLOCK_SIZE)) {
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return sectrue;
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}
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uint8_t hash[32];
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vendor_keys_hash(vhdr, hash);
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return sectrue * (0 == memcmp(lock, hash, 32));
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}
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// protection against bootloader downgrade
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#if PRODUCTION
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static void check_bootloader_version(void) {
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uint8_t bits[FLASH_OTP_BLOCK_SIZE];
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for (int i = 0; i < FLASH_OTP_BLOCK_SIZE * 8; i++) {
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if (i < VERSION_MONOTONIC) {
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bits[i / 8] &= ~(1 << (7 - (i % 8)));
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} else {
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bits[i / 8] |= (1 << (7 - (i % 8)));
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}
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}
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ensure(flash_otp_write(FLASH_OTP_BLOCK_BOOTLOADER_VERSION, 0, bits,
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FLASH_OTP_BLOCK_SIZE),
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NULL);
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uint8_t bits2[FLASH_OTP_BLOCK_SIZE];
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ensure(flash_otp_read(FLASH_OTP_BLOCK_BOOTLOADER_VERSION, 0, bits2,
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FLASH_OTP_BLOCK_SIZE),
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NULL);
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ensure(sectrue * (0 == memcmp(bits, bits2, FLASH_OTP_BLOCK_SIZE)),
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"Bootloader downgraded");
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}
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#endif
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int main(void) {
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drbg_init();
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touch_init();
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touch_power_on();
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mpu_config_bootloader();
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#if PRODUCTION
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check_bootloader_version();
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#endif
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display_clear();
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vendor_header vhdr;
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image_header hdr;
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// detect whether the devices contains a valid firmware
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secbool firmware_present =
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load_vendor_header_keys((const uint8_t *)FIRMWARE_START, &vhdr);
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if (sectrue == firmware_present) {
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firmware_present = check_vendor_keys_lock(&vhdr);
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}
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if (sectrue == firmware_present) {
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firmware_present = load_image_header(
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(const uint8_t *)(FIRMWARE_START + vhdr.hdrlen), FIRMWARE_IMAGE_MAGIC,
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FIRMWARE_IMAGE_MAXSIZE, vhdr.vsig_m, vhdr.vsig_n, vhdr.vpub, &hdr);
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}
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if (sectrue == firmware_present) {
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firmware_present =
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check_image_contents(&hdr, IMAGE_HEADER_SIZE + vhdr.hdrlen,
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FIRMWARE_SECTORS, FIRMWARE_SECTORS_COUNT);
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}
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// always start bootloader even if firmware is already present
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// show intro animation
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// no ui_fadeout(); - we already start from black screen
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ui_screen_welcome_third();
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ui_fadein();
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// and start the usb loop
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if (bootloader_usb_loop(NULL, NULL) != sectrue) {
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return 1;
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}
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ensure(load_vendor_header_keys((const uint8_t *)FIRMWARE_START, &vhdr),
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"invalid vendor header");
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ensure(check_vendor_keys_lock(&vhdr), "unauthorized vendor keys");
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ensure(load_image_header((const uint8_t *)(FIRMWARE_START + vhdr.hdrlen),
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FIRMWARE_IMAGE_MAGIC, FIRMWARE_IMAGE_MAXSIZE,
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vhdr.vsig_m, vhdr.vsig_n, vhdr.vpub, &hdr),
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"invalid firmware header");
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ensure(check_image_contents(&hdr, IMAGE_HEADER_SIZE + vhdr.hdrlen,
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FIRMWARE_SECTORS, FIRMWARE_SECTORS_COUNT),
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"invalid firmware hash");
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// do not check any trust flags on header, proceed
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// mpu_config_firmware();
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// jump_to_unprivileged(FIRMWARE_START + vhdr.hdrlen + IMAGE_HEADER_SIZE);
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mpu_config_off();
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jump_to(FIRMWARE_START + vhdr.hdrlen + IMAGE_HEADER_SIZE);
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return 0;
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}
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