mirror of
https://github.com/trezor/trezor-firmware.git
synced 2024-12-30 18:10:56 +00:00
360 lines
12 KiB
Python
Executable File
360 lines
12 KiB
Python
Executable File
#!/usr/bin/env python3
|
|
|
|
from __future__ import print_function
|
|
|
|
import sys
|
|
import struct
|
|
import binascii
|
|
|
|
import pyblake2
|
|
|
|
from trezorlib import cosi
|
|
|
|
|
|
def format_sigmask(sigmask):
|
|
bits = [str(b + 1) if sigmask & (1 << b) else "." for b in range(8)]
|
|
return "0x%02x = [%s]" % (sigmask, " ".join(bits))
|
|
|
|
|
|
def format_vtrust(vtrust):
|
|
bits = [str(b) if vtrust & (1 << b) == 0 else "." for b in range(16)]
|
|
# see docs/bootloader.md for vtrust constants
|
|
desc = ""
|
|
wait = (vtrust & 0x000F) ^ 0x000F
|
|
if wait > 0:
|
|
desc = "WAIT_%d" % wait
|
|
if vtrust & 0x0010 == 0:
|
|
desc += " RED"
|
|
if vtrust & 0x0020 == 0:
|
|
desc += " CLICK"
|
|
if vtrust & 0x0040 == 0:
|
|
desc += " STRING"
|
|
return "%d = [%s] = [%s]" % (vtrust, " ".join(bits), desc)
|
|
|
|
|
|
# bootloader/firmware headers specification: https://github.com/trezor/trezor-core/blob/master/docs/bootloader.md
|
|
|
|
IMAGE_HEADER_SIZE = 1024
|
|
IMAGE_SIG_SIZE = 65
|
|
IMAGE_CHUNK_SIZE = 128 * 1024
|
|
BOOTLOADER_SECTORS_COUNT = 1
|
|
FIRMWARE_SECTORS_COUNT = 6 + 7
|
|
|
|
|
|
class BinImage(object):
|
|
def __init__(self, data, magic, max_size):
|
|
header = struct.unpack("<4sIIIBBBBBBBB8s512s415sB64s", data[:IMAGE_HEADER_SIZE])
|
|
self.magic, self.hdrlen, self.expiry, self.codelen, self.vmajor, self.vminor, self.vpatch, self.vbuild, self.fix_vmajor, self.fix_vminor, self.fix_vpatch, self.fix_vbuild, self.reserved1, self.hashes, self.reserved2, self.sigmask, self.sig = (
|
|
header
|
|
)
|
|
assert self.magic == magic
|
|
assert self.hdrlen == IMAGE_HEADER_SIZE
|
|
total_len = self.hdrlen + self.codelen
|
|
assert total_len % 512 == 0
|
|
assert total_len >= 4 * 1024
|
|
assert total_len <= max_size
|
|
assert self.reserved1 == 8 * b"\x00"
|
|
assert self.reserved2 == 415 * b"\x00"
|
|
self.code = data[self.hdrlen :]
|
|
assert len(self.code) == self.codelen
|
|
|
|
def print(self):
|
|
if self.magic == b"TRZF":
|
|
print("Trezor Firmware Image")
|
|
total_len = self.vhdrlen + self.hdrlen + self.codelen
|
|
elif self.magic == b"TRZB":
|
|
print("Trezor Bootloader Image")
|
|
total_len = self.hdrlen + self.codelen
|
|
else:
|
|
print("Trezor Unknown Image")
|
|
print(" * magic :", self.magic.decode())
|
|
print(" * hdrlen :", self.hdrlen)
|
|
print(" * expiry :", self.expiry)
|
|
print(" * codelen :", self.codelen)
|
|
print(
|
|
" * version : %d.%d.%d.%d"
|
|
% (self.vmajor, self.vminor, self.vpatch, self.vbuild)
|
|
)
|
|
print(
|
|
" * fixver : %d.%d.%d.%d"
|
|
% (self.fix_vmajor, self.fix_vminor, self.fix_vpatch, self.fix_vbuild)
|
|
)
|
|
print(" * hashes: %s" % ("OK" if self.check_hashes() else "INCORRECT"))
|
|
for i in range(16):
|
|
print(
|
|
" - %02d : %s"
|
|
% (i, binascii.hexlify(self.hashes[i * 32 : i * 32 + 32]).decode())
|
|
)
|
|
print(" * sigmask :", format_sigmask(self.sigmask))
|
|
print(" * sig :", binascii.hexlify(self.sig).decode())
|
|
print(" * total : %d bytes" % total_len)
|
|
print(" * fngprnt :", self.fingerprint())
|
|
print()
|
|
|
|
def compute_hashes(self):
|
|
if self.magic == b"TRZF":
|
|
hdrlen = self.vhdrlen + self.hdrlen
|
|
else:
|
|
hdrlen = self.hdrlen
|
|
hashes = b""
|
|
for i in range(16):
|
|
if i == 0:
|
|
d = self.code[: IMAGE_CHUNK_SIZE - hdrlen]
|
|
else:
|
|
s = IMAGE_CHUNK_SIZE - hdrlen + (i - 1) * IMAGE_CHUNK_SIZE
|
|
d = self.code[s : s + IMAGE_CHUNK_SIZE]
|
|
if len(d) > 0:
|
|
h = pyblake2.blake2s(d).digest()
|
|
else:
|
|
h = 32 * b"\x00"
|
|
hashes += h
|
|
return hashes
|
|
|
|
def check_hashes(self):
|
|
return self.hashes == self.compute_hashes()
|
|
|
|
def update_hashes(self):
|
|
self.hashes = self.compute_hashes()
|
|
|
|
def serialize_header(self, sig=True):
|
|
header = struct.pack(
|
|
"<4sIIIBBBBBBBB8s512s415s",
|
|
self.magic,
|
|
self.hdrlen,
|
|
self.expiry,
|
|
self.codelen,
|
|
self.vmajor,
|
|
self.vminor,
|
|
self.vpatch,
|
|
self.vbuild,
|
|
self.fix_vmajor,
|
|
self.fix_vminor,
|
|
self.fix_vpatch,
|
|
self.fix_vbuild,
|
|
self.reserved1,
|
|
self.hashes,
|
|
self.reserved2,
|
|
)
|
|
if sig:
|
|
header += struct.pack("<B64s", self.sigmask, self.sig)
|
|
else:
|
|
header += IMAGE_SIG_SIZE * b"\x00"
|
|
assert len(header) == self.hdrlen
|
|
return header
|
|
|
|
def fingerprint(self):
|
|
return pyblake2.blake2s(self.serialize_header(sig=False)).hexdigest()
|
|
|
|
def sign(self, sigmask, signature):
|
|
header = self.serialize_header(sig=False)
|
|
data = header + self.code
|
|
assert len(data) == self.hdrlen + self.codelen
|
|
self.sigmask = sigmask
|
|
self.sig = signature
|
|
|
|
def write(self, filename):
|
|
with open(filename, "wb") as f:
|
|
f.write(self.serialize_header())
|
|
f.write(self.code)
|
|
|
|
|
|
class FirmwareImage(BinImage):
|
|
def __init__(self, data, vhdrlen):
|
|
super(FirmwareImage, self).__init__(
|
|
data[vhdrlen:],
|
|
magic=b"TRZF",
|
|
max_size=FIRMWARE_SECTORS_COUNT * IMAGE_CHUNK_SIZE,
|
|
)
|
|
self.vhdrlen = vhdrlen
|
|
self.vheader = data[:vhdrlen]
|
|
|
|
def write(self, filename):
|
|
with open(filename, "wb") as f:
|
|
f.write(self.vheader)
|
|
f.write(self.serialize_header())
|
|
f.write(self.code)
|
|
|
|
|
|
class BootloaderImage(BinImage):
|
|
def __init__(self, data):
|
|
super(BootloaderImage, self).__init__(
|
|
data, magic=b"TRZB", max_size=BOOTLOADER_SECTORS_COUNT * IMAGE_CHUNK_SIZE
|
|
)
|
|
|
|
|
|
class VendorHeader(object):
|
|
def __init__(self, data):
|
|
header = struct.unpack("<4sIIBBBBH", data[:18])
|
|
self.magic, self.hdrlen, self.expiry, self.vmajor, self.vminor, self.vsig_m, self.vsig_n, self.vtrust = (
|
|
header
|
|
)
|
|
assert self.magic == b"TRZV"
|
|
data = data[: self.hdrlen] # strip remaining data (firmware)
|
|
assert self.vsig_m > 0 and self.vsig_m <= self.vsig_n
|
|
assert self.vsig_n > 0 and self.vsig_n <= 8
|
|
p = 32
|
|
self.vpub = []
|
|
for _ in range(self.vsig_n):
|
|
self.vpub.append(data[p : p + 32])
|
|
p += 32
|
|
self.vstr_len = data[p]
|
|
p += 1
|
|
self.vstr = data[p : p + self.vstr_len]
|
|
p += self.vstr_len
|
|
vstr_pad = -p & 3
|
|
p += vstr_pad
|
|
self.vimg_len = len(data) - IMAGE_SIG_SIZE - p
|
|
self.vimg = data[p : p + self.vimg_len]
|
|
p += self.vimg_len
|
|
self.sigmask = data[p]
|
|
p += 1
|
|
self.sig = data[p : p + 64]
|
|
assert (
|
|
len(data)
|
|
== 4
|
|
+ 4
|
|
+ 4
|
|
+ 1
|
|
+ 1
|
|
+ 1
|
|
+ 1
|
|
+ 1
|
|
+ 15
|
|
+ 32 * len(self.vpub)
|
|
+ 1
|
|
+ self.vstr_len
|
|
+ vstr_pad
|
|
+ self.vimg_len
|
|
+ IMAGE_SIG_SIZE
|
|
)
|
|
assert len(data) % 512 == 0
|
|
|
|
def print(self):
|
|
print("Trezor Vendor Header")
|
|
print(" * magic :", self.magic.decode())
|
|
print(" * hdrlen :", self.hdrlen)
|
|
print(" * expiry :", self.expiry)
|
|
print(" * version : %d.%d" % (self.vmajor, self.vminor))
|
|
print(" * scheme : %d out of %d" % (self.vsig_m, self.vsig_n))
|
|
print(" * trust :", format_vtrust(self.vtrust))
|
|
for i in range(self.vsig_n):
|
|
print(" * vpub #%d :" % (i + 1), binascii.hexlify(self.vpub[i]).decode())
|
|
print(" * vstr :", self.vstr.decode())
|
|
print(" * vhash :", binascii.hexlify(self.vhash()).decode())
|
|
print(" * vimg : (%d bytes)" % len(self.vimg))
|
|
print(" * sigmask :", format_sigmask(self.sigmask))
|
|
print(" * sig :", binascii.hexlify(self.sig).decode())
|
|
print(" * fngprnt :", self.fingerprint())
|
|
print()
|
|
|
|
def serialize_header(self, sig=True):
|
|
header = struct.pack(
|
|
"<4sIIBBBBH",
|
|
self.magic,
|
|
self.hdrlen,
|
|
self.expiry,
|
|
self.vmajor,
|
|
self.vminor,
|
|
self.vsig_m,
|
|
self.vsig_n,
|
|
self.vtrust,
|
|
)
|
|
header += 14 * b"\x00"
|
|
for i in range(self.vsig_n):
|
|
header += self.vpub[i]
|
|
header += struct.pack("<B", self.vstr_len) + self.vstr
|
|
header += (-len(header) & 3) * b"\x00" # vstr_pad
|
|
header += self.vimg
|
|
if sig:
|
|
header += struct.pack("<B64s", self.sigmask, self.sig)
|
|
else:
|
|
header += IMAGE_SIG_SIZE * b"\x00"
|
|
assert len(header) == self.hdrlen
|
|
return header
|
|
|
|
def fingerprint(self):
|
|
return pyblake2.blake2s(self.serialize_header(sig=False)).hexdigest()
|
|
|
|
def vhash(self):
|
|
h = pyblake2.blake2s()
|
|
h.update(struct.pack("<BB", self.vsig_m, self.vsig_n))
|
|
for i in range(8):
|
|
if i < self.vsig_n:
|
|
h.update(self.vpub[i])
|
|
else:
|
|
h.update(b"\x00" * 32)
|
|
return h.digest()
|
|
|
|
def sign(self, sigmask, signature):
|
|
header = self.serialize_header(sig=False)
|
|
assert len(header) == self.hdrlen
|
|
self.sigmask = sigmask
|
|
self.sig = signature
|
|
|
|
def write(self, filename):
|
|
with open(filename, "wb") as f:
|
|
f.write(self.serialize_header())
|
|
|
|
|
|
def binopen(filename):
|
|
data = open(filename, "rb").read()
|
|
magic = data[:4]
|
|
if magic == b"TRZB":
|
|
return BootloaderImage(data)
|
|
if magic == b"TRZV":
|
|
vheader = VendorHeader(data)
|
|
if len(data) == vheader.hdrlen:
|
|
return vheader
|
|
vheader.print()
|
|
subdata = data[vheader.hdrlen :]
|
|
if subdata[:4] == b"TRZF":
|
|
firmware = FirmwareImage(data, vheader.hdrlen)
|
|
# check signatures against signing keys in the vendor header
|
|
if firmware.sigmask > 0:
|
|
pk = [vheader.vpub[i] for i in range(8) if firmware.sigmask & (1 << i)]
|
|
global_pk = cosi.combine_keys(pk)
|
|
hdr = (
|
|
subdata[: IMAGE_HEADER_SIZE - IMAGE_SIG_SIZE]
|
|
+ IMAGE_SIG_SIZE * b"\x00"
|
|
)
|
|
digest = pyblake2.blake2s(hdr).digest()
|
|
try:
|
|
cosi.verify(firmware.sig, digest, global_pk)
|
|
print("Firmware signature OK")
|
|
except ValueError:
|
|
print("Firmware signature INCORRECT")
|
|
else:
|
|
print("No firmware signature")
|
|
return firmware
|
|
if magic == b"TRZF":
|
|
return FirmwareImage(data, 0)
|
|
raise Exception("Unknown file format")
|
|
|
|
|
|
def main():
|
|
if len(sys.argv) < 2:
|
|
print("Usage: binctl file.bin [-s sigmask signature] [-h]")
|
|
return 1
|
|
fn = sys.argv[1]
|
|
sign = len(sys.argv) > 2 and sys.argv[2] == "-s"
|
|
rehash = len(sys.argv) == 3 and sys.argv[2] == "-h"
|
|
b = binopen(fn)
|
|
if sign:
|
|
sigmask = 0
|
|
if ":" in sys.argv[3]:
|
|
for idx in sys.argv[3].split(":"):
|
|
sigmask |= 1 << (int(idx) - 1)
|
|
else:
|
|
sigmask = 1 << (int(sys.argv[3]) - 1)
|
|
signature = binascii.unhexlify(sys.argv[4])
|
|
b.sign(sigmask, signature)
|
|
b.write(fn)
|
|
if rehash:
|
|
b.update_hashes()
|
|
b.write(fn)
|
|
b.print()
|
|
|
|
|
|
if __name__ == "__main__":
|
|
main()
|