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114 lines
4.4 KiB
114 lines
4.4 KiB
/*
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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 <stdint.h>
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#include <string.h>
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#include "blake2s.h"
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#include "common.h"
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#include "flash.h"
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// symbols from bootloader.bin => bootloader.o
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extern const uint32_t _binary_embed_firmware_bootloader_bin_start;
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extern const uint32_t _binary_embed_firmware_bootloader_bin_size;
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/*
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static secbool known_bootloader(const uint8_t *hash, int len) {
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if (len != 32) return secfalse;
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// bootloader-2.0.1.bin (padded with 0x00)
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if (0 == memcmp(hash,
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"\x91\x37\x46\xd0\x2d\xa7\xc4\xbe\x1d\xae\xef\xb0\x9b\x4e\x31\x88\xed\x38\x23\x5e\x0e\x31\xa7\x8c\x01\xde\x4e\xcc\xc2\xd6\x36\xb3",
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32)) return sectrue;
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// bootloader-2.0.1.bin (padded with 0xff)
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if (0 == memcmp(hash,
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"\x2f\xdb\xde\x94\x0a\xd8\x91\x1c\xbd\x07\xb0\xba\x06\x2c\x90\x84\x02\xec\x95\x19\xde\x52\x8d\x4b\xe9\xb9\xed\x30\x71\x91\xb4\xd3",
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32)) return sectrue;
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// bootloader-2.0.2.bin (padded with 0x00)
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if (0 == memcmp(hash,
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"\x2e\xf7\x47\xf8\x49\x87\x1e\xc8\xc6\x01\x35\xd6\x32\xe5\x5a\xd1\x56\x18\xf8\x64\x87\xb7\xaa\x7c\x62\x0e\xc3\x0d\x25\x69\x4e\x18",
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32)) return sectrue;
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// bootloader-2.0.2.bin (padded with 0xff)
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if (0 == memcmp(hash,
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"\xcc\x6b\x35\xc3\x8f\x29\x5c\xbd\x7d\x31\x69\xaf\xae\xf1\x61\x01\xef\xbe\x9f\x3b\x0a\xfd\xc5\x91\x70\x9b\xf5\xa0\xd5\xa4\xc5\xe0",
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32)) return sectrue;
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// bootloader-2.0.3.bin (padded with 0x00)
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if (0 == memcmp(hash,
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"\xb1\x83\xd3\x31\xc7\xff\x3d\xcf\x54\x1e\x7e\x40\xf4\x9e\xc3\x53\x4c\xcc\xf3\x8c\x35\x39\x88\x81\x65\xc0\x5c\x25\xbd\xfc\xea\x14",
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32)) return sectrue;
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// bootloader-2.0.3.bin (padded with 0xff)
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if (0 == memcmp(hash,
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"\xab\xdb\x7d\xe2\xef\x44\x66\xa7\xb7\x1f\x2b\x02\xf3\xe1\x40\xe7\xcd\xf2\x8e\xc0\xbb\x33\x04\xce\x0d\xa5\xca\x02\x57\xb6\xd4\x30",
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32)) return sectrue; return secfalse;
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}
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*/
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static secbool latest_bootloader(const uint8_t *hash, int len) {
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if (len != 32) return secfalse;
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// bootloader.bin (padded with 0x00)
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if (0 ==
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memcmp(hash,
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"\xb1\x83\xd3\x31\xc7\xff\x3d\xcf\x54\x1e\x7e\x40\xf4\x9e\xc3\x53"
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"\x4c\xcc\xf3\x8c\x35\x39\x88\x81\x65\xc0\x5c\x25\xbd\xfc\xea\x14",
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32))
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return sectrue;
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// bootloader.bin (padded with 0xff)
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if (0 ==
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memcmp(hash,
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"\xab\xdb\x7d\xe2\xef\x44\x66\xa7\xb7\x1f\x2b\x02\xf3\xe1\x40\xe7"
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"\xcd\xf2\x8e\xc0\xbb\x33\x04\xce\x0d\xa5\xca\x02\x57\xb6\xd4\x30",
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32))
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return sectrue;
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return secfalse;
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}
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void check_and_replace_bootloader(void) {
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// compute current bootloader hash
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uint8_t hash[BLAKE2S_DIGEST_LENGTH];
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const uint32_t bl_len = 128 * 1024;
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const void *bl_data = flash_get_address(FLASH_SECTOR_BOOTLOADER, 0, bl_len);
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blake2s(bl_data, bl_len, hash, BLAKE2S_DIGEST_LENGTH);
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// don't whitelist the valid bootloaders for now
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// ensure(known_bootloader(hash, BLAKE2S_DIGEST_LENGTH), "Unknown bootloader
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// detected");
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// do we have the latest bootloader?
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if (sectrue == latest_bootloader(hash, BLAKE2S_DIGEST_LENGTH)) {
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return;
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}
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// replace bootloader with the latest one
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const uint32_t *data =
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(const uint32_t *)&_binary_embed_firmware_bootloader_bin_start;
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const uint32_t len =
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(const uint32_t)&_binary_embed_firmware_bootloader_bin_size;
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ensure(flash_erase(FLASH_SECTOR_BOOTLOADER), NULL);
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ensure(flash_unlock_write(), NULL);
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for (int i = 0; i < len / sizeof(uint32_t); i++) {
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ensure(flash_write_word(FLASH_SECTOR_BOOTLOADER, i * sizeof(uint32_t),
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data[i]),
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NULL);
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}
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for (int i = len / sizeof(uint32_t); i < 128 * 1024 / sizeof(uint32_t); i++) {
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ensure(flash_write_word(FLASH_SECTOR_BOOTLOADER, i * sizeof(uint32_t),
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0x00000000),
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NULL);
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}
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ensure(flash_lock_write(), NULL);
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}
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