mirror of
https://github.com/trezor/trezor-firmware.git
synced 2024-11-14 03:30:02 +00:00
firmware: recognize, verify and handle firmware v1.8.0 and up
Also reorganize firmware validation code somewhat, so that trezorctl consumes a unified interface.
This commit is contained in:
matejcik
parent
408c6712c1
commit
cfb19dfb15
126
trezorctl
126
trezorctl
@ -516,53 +516,53 @@ def backup_device(connect):
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#
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def validate_firmware_v1(fw, expected_fingerprint=None):
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click.echo("Trezor One firmware image.")
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distinct_sig_slots = set(i for i in fw.key_indexes if i != 0)
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if not distinct_sig_slots:
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ALLOWED_FIRMWARE_FORMATS = {
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1: (firmware.FirmwareFormat.TREZOR_ONE, firmware.FirmwareFormat.TREZOR_ONE_V2),
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2: (firmware.FirmwareFormat.TREZOR_T),
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}
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def _print_version(version):
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vstr = "Firmware version {major}.{minor}.{patch} build {build}".format(**version)
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click.echo(vstr)
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def validate_firmware(version, fw, expected_fingerprint=None):
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if version == firmware.FirmwareFormat.TREZOR_ONE:
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if fw.embedded_onev2:
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click.echo("Trezor One firmware with embedded v2 image (1.8.0 or later)")
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_print_version(fw.embedded_onev2.firmware_header.version)
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else:
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click.echo("Trezor One firmware image.")
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elif version == firmware.FirmwareFormat.TREZOR_ONE_V2:
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click.echo("Trezor One v2 firmware (1.8.0 or later)")
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_print_version(fw.firmware_header.version)
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elif version == firmware.FirmwareFormat.TREZOR_T:
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click.echo("Trezor T firmware image.")
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vendor = fw.vendor_header.vendor_string
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vendor_version = "{major}.{minor}".format(**fw.vendor_header.version)
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click.echo("Vendor header from {}, version {}".format(vendor, vendor_version))
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_print_version(fw.firmware_header.version)
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try:
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firmware.validate(version, fw)
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click.echo("Signatures are valid.")
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except firmware.Unsigned:
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if not click.confirm("No signatures found. Continue?", default=False):
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sys.exit(1)
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elif len(distinct_sig_slots) < 3:
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click.echo("Badly signed image (need 3 distinct signatures), aborting.")
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sys.exit(1)
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else:
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all_valid = True
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for i in range(len(fw.key_indexes)):
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if not firmware.check_sig_v1(fw, i):
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click.echo("INVALID signature in slot {}".format(i))
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all_valid = False
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if all_valid:
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click.echo("Signatures are valid.")
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else:
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click.echo("Invalid signature detected, aborting.")
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try:
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firmware.validate(version, fw, allow_unsigned=True)
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click.echo("Unsigned firmware looking OK.")
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except firmware.FirmwareIntegrityError as e:
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click.echo(e)
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click.echo("Firmware validation failed, aborting.")
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sys.exit(4)
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fingerprint = firmware.digest_v1(fw).hex()
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click.echo("Firmware fingerprint: {}".format(fingerprint))
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if expected_fingerprint and fingerprint != expected_fingerprint:
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click.echo("Expected fingerprint: {}".format(expected_fingerprint))
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click.echo("Fingerprints do not match, aborting.")
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sys.exit(5)
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def validate_firmware_v2(fw, expected_fingerprint=None, skip_vendor_header=False):
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click.echo("Trezor T firmware image.")
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vendor = fw.vendor_header.vendor_string
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vendor_version = "{major}.{minor}".format(**fw.vendor_header.version)
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version = fw.firmware_header.version
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click.echo("Vendor header from {}, version {}".format(vendor, vendor_version))
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click.echo(
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"Firmware version {major}.{minor}.{patch} build {build}".format(**version)
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)
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try:
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firmware.validate(fw, skip_vendor_header)
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click.echo("Signatures are valid.")
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except Exception as e:
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except firmware.FirmwareIntegrityError as e:
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click.echo(e)
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click.echo("Firmware validation failed, aborting.")
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sys.exit(4)
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fingerprint = firmware.digest(fw).hex()
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fingerprint = firmware.digest(version, fw).hex()
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click.echo("Firmware fingerprint: {}".format(fingerprint))
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if expected_fingerprint and fingerprint != expected_fingerprint:
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click.echo("Expected fingerprint: {}".format(expected_fingerprint))
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@ -628,15 +628,18 @@ def find_best_firmware_version(bootloader_version, requested_version=None):
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@cli.command()
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# fmt: off
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@click.option("-f", "--filename")
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@click.option("-u", "--url")
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@click.option("-v", "--version")
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@click.option("-s", "--skip-check", is_flag=True)
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@click.option("-s", "--skip-check", is_flag=True, help="Do not validate firmware integrity")
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@click.option("--raw", is_flag=True, help="Push raw data to Trezor")
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@click.option("--fingerprint", help="Expected firmware fingerprint in hex")
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@click.option("--skip-vendor-header", help="Skip vendor header validation on Trezor T")
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# fmt: on
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@click.pass_obj
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def firmware_update(
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connect, filename, url, version, skip_check, fingerprint, skip_vendor_header
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connect, filename, url, version, skip_check, fingerprint, skip_vendor_header, raw
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):
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"""Upload new firmware to device.
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@ -663,13 +666,13 @@ def firmware_update(
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click.echo("Please switch your device to bootloader mode.")
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sys.exit(1)
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firmware_version = client.features.major_version
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f = client.features
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bootloader_onev2 = f.major_version == 1 and f.minor_version >= 8
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if filename:
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data = open(filename, "rb").read()
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else:
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if not url:
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f = client.features
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bootloader_version = [f.major_version, f.minor_version, f.patch_version]
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version_list = [int(x) for x in version.split(".")] if version else None
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url, fp = find_best_firmware_version(bootloader_version, version_list)
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@ -680,26 +683,41 @@ def firmware_update(
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r = requests.get(url)
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data = r.content
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if not skip_check:
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if not raw and not skip_check:
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try:
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version, fw = firmware.parse(data)
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except Exception as e:
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click.echo(e)
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sys.exit(2)
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if version == firmware.FirmwareFormat.TREZOR_ONE:
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validate_firmware_v1(fw, fingerprint)
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elif version == firmware.FirmwareFormat.TREZOR_T:
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validate_firmware_v2(fw, fingerprint)
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else:
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click.echo("Unrecognized firmware version.")
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validate_firmware(version, fw, fingerprint)
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if (
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bootloader_onev2
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and version == firmware.FirmwareFormat.TREZOR_ONE
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and not fw.embedded_onev2
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):
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click.echo("Firmware is too old for your device. Aborting.")
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sys.exit(3)
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elif not bootloader_onev2 and version == firmware.FirmwareFormat.TREZOR_ONE_V2:
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click.echo("You need to upgrade to bootloader 1.8.0 first.")
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sys.exit(3)
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if firmware_version != version.value:
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if f.major_version not in ALLOWED_FIRMWARE_FORMATS:
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click.echo("trezorctl doesn't know your device version. Aborting.")
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sys.exit(3)
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elif version not in ALLOWED_FIRMWARE_FORMATS[f.major_version]:
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click.echo("Firmware does not match your device, aborting.")
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sys.exit(3)
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if not raw:
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# special handling for embedded-OneV2 format:
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# for bootloader < 1.8, keep the embedding
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# for bootloader 1.8.0 and up, strip the old OneV1 header
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if bootloader_onev2 and data[:4] == b"TRZR" and data[256 : 256 + 4] == b"TRZF":
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data = data[256:]
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try:
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if firmware_version == 1:
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if f.major_version == 1 and f.firmware_present:
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# Trezor One does not send ButtonRequest
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click.echo("Please confirm action on your Trezor device")
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return firmware.update(client, data)
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@ -16,7 +16,7 @@
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import hashlib
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from enum import Enum
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from typing import NewType, Tuple
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from typing import Callable, List, NewType, Tuple
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import construct as c
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import ecdsa
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@ -41,6 +41,7 @@ V2_BOOTLOADER_KEYS = [
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V2_BOOTLOADER_M = 2
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V2_BOOTLOADER_N = 3
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ONEV2_CHUNK_SIZE = 1024 * 64
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V2_CHUNK_SIZE = 1024 * 128
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@ -57,6 +58,18 @@ def _transform_vendor_trust(data: bytes) -> bytes:
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return bytes(~b & 0xFF for b in data)[::-1]
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class FirmwareIntegrityError(Exception):
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pass
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class InvalidSignatureError(FirmwareIntegrityError):
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pass
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class Unsigned(FirmwareIntegrityError):
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pass
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# fmt: off
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Toif = c.Struct(
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"magic" / c.Const(b"TOI"),
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@ -117,7 +130,7 @@ VersionLong = c.Struct(
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FirmwareHeader = c.Struct(
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"_start_offset" / c.Tell,
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"magic" / c.Const(b"TRZF"),
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"_header_len" / c.Padding(4),
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"header_len" / c.Int32ul,
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"expiry" / c.Int32ul,
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"code_length" / c.Rebuild(
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c.Int32ul,
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@ -130,14 +143,21 @@ FirmwareHeader = c.Struct(
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"reserved" / c.Padding(8),
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"hashes" / c.Bytes(32)[16],
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"reserved" / c.Padding(415),
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"v1_signatures" / c.Bytes(64)[V1_SIGNATURE_SLOTS],
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"v1_key_indexes" / c.Int8ul[V1_SIGNATURE_SLOTS], # pylint: disable=E1136
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"reserved" / c.Padding(220),
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"sigmask" / c.Byte,
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"signature" / c.Bytes(64),
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"_end_offset" / c.Tell,
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"header_len" / c.Pointer(
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c.this._start_offset + 4,
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c.Rebuild(c.Int32ul, c.this._end_offset - c.this._start_offset)
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"_rebuild_header_len" / c.If(
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c.this.version.major > 1,
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c.Pointer(
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c.this._start_offset + 4,
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c.Rebuild(c.Int32ul, c.this._end_offset - c.this._start_offset)
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),
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),
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)
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@ -151,7 +171,15 @@ Firmware = c.Struct(
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)
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FirmwareV1 = c.Struct(
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FirmwareOneV2 = c.Struct(
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"firmware_header" / FirmwareHeader,
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"_code_offset" / c.Tell,
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"code" / c.Bytes(c.this.firmware_header.code_length),
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c.Terminated,
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)
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FirmwareOne = c.Struct(
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"magic" / c.Const(b"TRZR"),
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"code_length" / c.Rebuild(c.Int32ul, c.len_(c.this.code)),
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"key_indexes" / c.Int8ul[V1_SIGNATURE_SLOTS], # pylint: disable=E1136
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@ -163,6 +191,8 @@ FirmwareV1 = c.Struct(
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"signatures" / c.Bytes(64)[V1_SIGNATURE_SLOTS],
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"code" / c.Bytes(c.this.code_length),
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c.Terminated,
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"embedded_onev2" / c.RestreamData(c.this.code, c.Optional(FirmwareOneV2)),
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)
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# fmt: on
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@ -171,6 +201,7 @@ FirmwareV1 = c.Struct(
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class FirmwareFormat(Enum):
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TREZOR_ONE = 1
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TREZOR_T = 2
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TREZOR_ONE_V2 = 3
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FirmwareType = NewType("FirmwareType", c.Container)
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@ -180,62 +211,137 @@ ParsedFirmware = Tuple[FirmwareFormat, FirmwareType]
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def parse(data: bytes) -> ParsedFirmware:
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if data[:4] == b"TRZR":
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version = FirmwareFormat.TREZOR_ONE
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cls = FirmwareV1
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cls = FirmwareOne
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elif data[:4] == b"TRZV":
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version = FirmwareFormat.TREZOR_T
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cls = Firmware
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elif data[:4] == b"TRZF":
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version = FirmwareFormat.TREZOR_ONE_V2
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cls = FirmwareOneV2
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else:
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raise ValueError("Unrecognized firmware image type")
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try:
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fw = cls.parse(data)
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except Exception as e:
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raise ValueError("Invalid firmware image") from e
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raise FirmwareIntegrityError("Invalid firmware image") from e
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return version, FirmwareType(fw)
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def digest_v1(fw: FirmwareType) -> bytes:
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def digest_onev1(fw: FirmwareType) -> bytes:
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return hashlib.sha256(fw.code).digest()
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def check_sig_v1(fw: FirmwareType, idx: int) -> bool:
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key_idx = fw.key_indexes[idx]
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signature = fw.signatures[idx]
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def check_sig_v1(
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digest: bytes, key_indexes: List[int], signatures: List[bytes]
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) -> None:
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distinct_key_indexes = set(i for i in key_indexes if i != 0)
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if not distinct_key_indexes:
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raise Unsigned
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if key_idx == 0:
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# no signature = invalid signature
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return False
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if len(distinct_key_indexes) < len(key_indexes):
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raise InvalidSignatureError(
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"Not enough distinct signatures (found {}, need {})".format(
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len(distinct_key_indexes), len(key_indexes)
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)
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)
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if key_idx not in V1_BOOTLOADER_KEYS:
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# unknown pubkey
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return False
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for i in range(len(key_indexes)):
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key_idx = key_indexes[i]
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signature = signatures[i]
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pubkey = bytes.fromhex(V1_BOOTLOADER_KEYS[key_idx])[1:]
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verify = ecdsa.VerifyingKey.from_string(
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pubkey, curve=ecdsa.curves.SECP256k1, hashfunc=hashlib.sha256
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)
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try:
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verify.verify(signature, fw.code)
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return True
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except ecdsa.BadSignatureError:
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return False
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if key_idx not in V1_BOOTLOADER_KEYS:
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# unknown pubkey
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raise InvalidSignatureError("Unknown key in slot {}".format(i))
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pubkey = bytes.fromhex(V1_BOOTLOADER_KEYS[key_idx])[1:]
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verify = ecdsa.VerifyingKey.from_string(pubkey, curve=ecdsa.curves.SECP256k1)
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try:
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verify.verify_digest(signature, digest)
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except ecdsa.BadSignatureError as e:
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raise InvalidSignatureError("Invalid signature in slot {}".format(i)) from e
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def _header_digest(header: c.Container, header_type: c.Construct) -> bytes:
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def _header_digest(
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header: c.Container,
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header_type: c.Construct,
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hash_function: Callable = pyblake2.blake2s,
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) -> bytes:
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stripped_header = header.copy()
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stripped_header.sigmask = 0
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stripped_header.signature = b"\0" * 64
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stripped_header.v1_key_indexes = [0, 0, 0]
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stripped_header.v1_signatures = [b"\0" * 64] * 3
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header_bytes = header_type.build(stripped_header)
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return pyblake2.blake2s(header_bytes).digest()
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return hash_function(header_bytes).digest()
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def digest(fw: FirmwareType) -> bytes:
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return _header_digest(fw.firmware_header, FirmwareHeader)
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def digest_v2(fw: FirmwareType) -> bytes:
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return _header_digest(fw.firmware_header, FirmwareHeader, pyblake2.blake2s)
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def validate(fw: FirmwareType, skip_vendor_header=False) -> bool:
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def digest_onev2(fw: FirmwareType) -> bytes:
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return _header_digest(fw.firmware_header, FirmwareHeader, hashlib.sha256)
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def validate_code_hashes(
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fw: FirmwareType,
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hash_function: Callable = pyblake2.blake2s,
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chunk_size: int = V2_CHUNK_SIZE,
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padding_byte: bytes = None,
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) -> None:
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for i, expected_hash in enumerate(fw.firmware_header.hashes):
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if i == 0:
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# Because first chunk is sent along with headers, there is less code in it.
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chunk = fw.code[: chunk_size - fw._code_offset]
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else:
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# Subsequent chunks are shifted by the "missing header" size.
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ptr = i * chunk_size - fw._code_offset
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chunk = fw.code[ptr : ptr + chunk_size]
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# padding for last chunk
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if padding_byte is not None and i > 1 and chunk and len(chunk) < chunk_size:
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chunk += padding_byte[0:1] * (chunk_size - len(chunk))
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if not chunk and expected_hash == b"\0" * 32:
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continue
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chunk_hash = hash_function(chunk).digest()
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if chunk_hash != expected_hash:
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raise FirmwareIntegrityError("Invalid firmware data.")
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def validate_onev2(fw: FirmwareType, allow_unsigned: bool = False) -> None:
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try:
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check_sig_v1(
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digest_onev2(fw),
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fw.firmware_header.v1_key_indexes,
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fw.firmware_header.v1_signatures,
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)
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except Unsigned:
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if not allow_unsigned:
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raise
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validate_code_hashes(
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fw,
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hash_function=hashlib.sha256,
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chunk_size=ONEV2_CHUNK_SIZE,
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padding_byte=b"\xFF",
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)
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|
||||
def validate_onev1(fw: FirmwareType, allow_unsigned: bool = False) -> None:
|
||||
try:
|
||||
check_sig_v1(digest_onev1(fw), fw.key_indexes, fw.signatures)
|
||||
except Unsigned:
|
||||
if not allow_unsigned:
|
||||
raise
|
||||
if fw.embedded_onev2:
|
||||
validate_onev2(fw.embedded_onev2, allow_unsigned)
|
||||
|
||||
|
||||
def validate_v2(fw: FirmwareType, skip_vendor_header=False) -> None:
|
||||
vendor_fingerprint = _header_digest(fw.vendor_header, VendorHeader)
|
||||
fingerprint = digest(fw)
|
||||
fingerprint = digest_v2(fw)
|
||||
|
||||
if not skip_vendor_header:
|
||||
try:
|
||||
@ -250,7 +356,7 @@ def validate(fw: FirmwareType, skip_vendor_header=False) -> bool:
|
||||
V2_BOOTLOADER_KEYS,
|
||||
)
|
||||
except Exception:
|
||||
raise ValueError("Invalid vendor header signature.")
|
||||
raise InvalidSignatureError("Invalid vendor header signature.")
|
||||
|
||||
# XXX expiry is not used now
|
||||
# now = time.gmtime()
|
||||
@ -267,28 +373,39 @@ def validate(fw: FirmwareType, skip_vendor_header=False) -> bool:
|
||||
fw.vendor_header.pubkeys,
|
||||
)
|
||||
except Exception:
|
||||
raise ValueError("Invalid firmware signature.")
|
||||
raise InvalidSignatureError("Invalid firmware signature.")
|
||||
|
||||
# XXX expiry is not used now
|
||||
# if time.gmtime(fw.firmware_header.expiry) < now:
|
||||
# raise ValueError("Firmware header expired.")
|
||||
validate_code_hashes(fw)
|
||||
|
||||
for i, expected_hash in enumerate(fw.firmware_header.hashes):
|
||||
if i == 0:
|
||||
# Because first chunk is sent along with headers, there is less code in it.
|
||||
chunk = fw.code[: V2_CHUNK_SIZE - fw._code_offset]
|
||||
|
||||
def digest(version: FirmwareFormat, fw: FirmwareType) -> bytes:
|
||||
if version == FirmwareFormat.TREZOR_ONE:
|
||||
if fw.embedded_onev2:
|
||||
return digest_onev2(fw.embedded_onev2)
|
||||
else:
|
||||
# Subsequent chunks are shifted by the "missing header" size.
|
||||
ptr = i * V2_CHUNK_SIZE - fw._code_offset
|
||||
chunk = fw.code[ptr : ptr + V2_CHUNK_SIZE]
|
||||
return digest_onev1(fw)
|
||||
elif version == FirmwareFormat.TREZOR_ONE_V2:
|
||||
return digest_onev2(fw)
|
||||
elif version == FirmwareFormat.TREZOR_T:
|
||||
return digest_v2(fw)
|
||||
else:
|
||||
raise ValueError("Unrecognized firmware version")
|
||||
|
||||
if not chunk and expected_hash == b"\0" * 32:
|
||||
continue
|
||||
chunk_hash = pyblake2.blake2s(chunk).digest()
|
||||
if chunk_hash != expected_hash:
|
||||
raise ValueError("Invalid firmware data.")
|
||||
|
||||
return True
|
||||
def validate(
|
||||
version: FirmwareFormat, fw: FirmwareType, allow_unsigned: bool = True
|
||||
) -> None:
|
||||
if version == FirmwareFormat.TREZOR_ONE:
|
||||
return validate_onev1(fw, allow_unsigned)
|
||||
elif version == FirmwareFormat.TREZOR_ONE_V2:
|
||||
return validate_onev2(fw, allow_unsigned)
|
||||
elif version == FirmwareFormat.TREZOR_T:
|
||||
return validate_v2(fw)
|
||||
else:
|
||||
raise ValueError("Unrecognized firmware version")
|
||||
|
||||
|
||||
# ====== Client functions ====== #
|
||||
|
||||
Loading…
Reference in New Issue
Block a user