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306 lines
10 KiB
306 lines
10 KiB
#!/usr/bin/env python3
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from __future__ import print_function
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import sys
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import struct
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import binascii
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import pyblake2
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from trezorlib import ed25519raw, ed25519cosi
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def format_sigmask(sigmask):
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bits = [str(b + 1) if sigmask & (1 << b) else '.' for b in range(8)]
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return '0x%02x = [%s]' % (sigmask, ' '.join(bits))
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def format_vtrust(vtrust):
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bits = [str(b) if vtrust & (1 << b) == 0 else '.' for b in range(16)]
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return '%d = [%s]' % (vtrust, ' '.join(bits))
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# bootloader/firmware headers specification: https://github.com/trezor/trezor-core/blob/master/docs/bootloader.md
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IMAGE_HEADER_SIZE = 1024
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IMAGE_SIG_SIZE = 65
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IMAGE_CHUNK_SIZE = 128 * 1024
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class BinImage(object):
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def __init__(self, data, magic, max_size):
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header = struct.unpack('<4sIIIBBBBBBBB8s512s415sB64s', data[:IMAGE_HEADER_SIZE])
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self.magic, \
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self.hdrlen, \
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self.expiry, \
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self.codelen, \
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self.vmajor, \
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self.vminor, \
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self.vpatch, \
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self.vbuild, \
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self.fix_vmajor, \
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self.fix_vminor, \
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self.fix_vpatch, \
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self.fix_vbuild, \
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self.reserved1, \
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self.hashes, \
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self.reserved2, \
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self.sigmask, \
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self.sig = header
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assert self.magic == magic
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assert self.hdrlen == IMAGE_HEADER_SIZE
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total_len = self.hdrlen + self.codelen
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assert total_len % 512 == 0
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assert total_len >= 4 * 1024
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assert total_len <= max_size
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assert self.reserved1 == 8 * b'\x00'
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assert self.reserved2 == 415 * b'\x00'
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self.code = data[self.hdrlen:]
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assert len(self.code) == self.codelen
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def print(self):
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if self.magic == b'TRZF':
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print('TREZOR Firmware Image')
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total_len = self.vhdrlen + self.hdrlen + self.codelen
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elif self.magic == b'TRZB':
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print('TREZOR Bootloader Image')
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total_len = self.hdrlen + self.codelen
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else:
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print('TREZOR Unknown Image')
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print(' * magic :', self.magic.decode())
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print(' * hdrlen :', self.hdrlen)
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print(' * expiry :', self.expiry)
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print(' * codelen :', self.codelen)
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print(' * version : %d.%d.%d.%d' % (self.vmajor, self.vminor, self.vpatch, self.vbuild))
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print(' * fixver : %d.%d.%d.%d' % (self.fix_vmajor, self.fix_vminor, self.fix_vpatch, self.fix_vbuild))
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print(' * hashes: %s' % ('OK' if self.check_hashes() else 'INCORRECT'))
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for i in range(16):
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print(' - %02d : %s' % (i, binascii.hexlify(self.hashes[i * 32:i * 32 + 32]).decode()))
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print(' * sigmask :', format_sigmask(self.sigmask))
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print(' * sig :', binascii.hexlify(self.sig).decode())
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print(' * total : %d bytes' % total_len)
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print(' * fngprnt :', self.fingerprint())
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print()
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def compute_hashes(self):
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if self.magic == b'TRZF':
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hdrlen = self.vhdrlen + self.hdrlen
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else:
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hdrlen = self.hdrlen
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hashes = b''
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for i in range(16):
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if i == 0:
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d = self.code[:IMAGE_CHUNK_SIZE - hdrlen]
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else:
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s = IMAGE_CHUNK_SIZE - hdrlen + (i - 1) * IMAGE_CHUNK_SIZE
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d = self.code[s:s + IMAGE_CHUNK_SIZE]
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if len(d) > 0:
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h = pyblake2.blake2s(d).digest()
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else:
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h = 32 * b'\x00'
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hashes += h
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return hashes
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def check_hashes(self):
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return self.hashes == self.compute_hashes()
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def update_hashes(self):
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self.hashes = self.compute_hashes()
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def serialize_header(self, sig=True):
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header = struct.pack('<4sIIIBBBBBBBB8s512s415s',
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self.magic, self.hdrlen, self.expiry, self.codelen,
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self.vmajor, self.vminor, self.vpatch, self.vbuild,
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self.fix_vmajor, self.fix_vminor, self.fix_vpatch, self.fix_vbuild,
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self.reserved1, self.hashes, self.reserved2)
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if sig:
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header += struct.pack('<B64s', self.sigmask, self.sig)
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else:
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header += IMAGE_SIG_SIZE * b'\x00'
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assert len(header) == self.hdrlen
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return header
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def fingerprint(self):
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return pyblake2.blake2s(self.serialize_header(False)).hexdigest()
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def sign(self, sigmask, signature):
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header = self.serialize_header(sig=False)
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data = header + self.code
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assert len(data) == self.hdrlen + self.codelen
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self.sigmask = sigmask
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self.sig = signature
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def write(self, filename):
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with open(filename, 'wb') as f:
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f.write(self.serialize_header())
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f.write(self.code)
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class FirmwareImage(BinImage):
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def __init__(self, data, vhdrlen):
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super(FirmwareImage, self).__init__(data[vhdrlen:], magic=b'TRZF', max_size=6 * IMAGE_CHUNK_SIZE)
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self.vhdrlen = vhdrlen
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self.vheader = data[:vhdrlen]
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def write(self, filename):
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with open(filename, 'wb') as f:
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f.write(self.vheader)
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f.write(self.serialize_header())
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f.write(self.code)
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class BootloaderImage(BinImage):
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def __init__(self, data):
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super(BootloaderImage, self).__init__(data, magic=b'TRZB', max_size=1 * IMAGE_CHUNK_SIZE)
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class VendorHeader(object):
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def __init__(self, data):
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header = struct.unpack('<4sIIBBBBH', data[:18])
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self.magic, \
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self.hdrlen, \
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self.expiry, \
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self.vmajor, \
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self.vminor, \
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self.vsig_m, \
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self.vsig_n, \
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self.vtrust = header
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assert self.magic == b'TRZV'
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assert self.vsig_m > 0 and self.vsig_m <= self.vsig_n
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assert self.vsig_n > 0 and self.vsig_n <= 8
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p = 32
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self.vpub = []
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for _ in range(self.vsig_n):
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self.vpub.append(data[p:p + 32])
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p += 32
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self.vstr_len = data[p]
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p += 1
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self.vstr = data[p:p + self.vstr_len]
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p += self.vstr_len
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vstr_pad = -p & 3
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p += vstr_pad
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self.vimg_len = len(data) - IMAGE_SIG_SIZE - p
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self.vimg = data[p:p + self.vimg_len]
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p += self.vimg_len
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self.sigmask = data[p]
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p += 1
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self.sig = data[p:p + 64]
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assert len(data) == 4 + 4 + 4 + 1 + 1 + 1 + 1 + 1 + 15 + \
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32 * len(self.vpub) + \
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1 + self.vstr_len + vstr_pad + \
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self.vimg_len + \
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IMAGE_SIG_SIZE
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assert len(data) % 512 == 0
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def print(self):
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print('TREZOR Vendor Header')
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print(' * magic :', self.magic.decode())
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print(' * hdrlen :', self.hdrlen)
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print(' * expiry :', self.expiry)
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print(' * version : %d.%d' % (self.vmajor, self.vminor))
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print(' * scheme : %d out of %d' % (self.vsig_m, self.vsig_n))
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print(' * trust :', format_vtrust(self.vtrust))
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for i in range(self.vsig_n):
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print(' * vpub #%d :' % (i + 1), binascii.hexlify(self.vpub[i]).decode())
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print(' * vstr :', self.vstr.decode())
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print(' * vimg : (%d bytes)' % len(self.vimg))
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print(' * sigmask :', format_sigmask(self.sigmask))
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print(' * sig :', binascii.hexlify(self.sig).decode())
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print()
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def serialize_header(self, sig=True):
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header = struct.pack('<4sIIBBBBH',
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self.magic, self.hdrlen, self.expiry,
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self.vmajor, self.vminor,
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self.vsig_m, self.vsig_n, self.vtrust)
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header += 14 * b'\x00'
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for i in range(self.vsig_n):
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header += self.vpub[i]
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header += struct.pack('<B', self.vstr_len) + self.vstr
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header += (-len(header) & 3) * b'\x00' # vstr_pad
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header += self.vimg
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if sig:
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header += struct.pack('<B64s', self.sigmask, self.sig)
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else:
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header += IMAGE_SIG_SIZE * b'\x00'
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assert len(header) == self.hdrlen
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return header
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def sign(self, sigmask, signature):
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if sigmask >= (1 << self.vsig_n):
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raise Exception('signature index is higher than vsig_n (%d)' % self.vsig_n)
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if bin(sigmask).count('1') != self.vsig_m:
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raise Exception('invalid number of indexes (vsig_m expected %d, got %d)' % (self.vsig_m, bin(sigmask).count('1')))
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# sign
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self.sigmask = sigmask
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self.sig = signature
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def write(self, filename):
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with open(filename, 'wb') as f:
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f.write(self.serialize_header())
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def binopen(filename):
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data = open(filename, 'rb').read()
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magic = data[:4]
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if magic == b'TRZB':
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return BootloaderImage(data)
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if magic == b'TRZV':
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vheader = VendorHeader(data)
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if len(data) == vheader.hdrlen:
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return vheader
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subdata = data[vheader.hdrlen:]
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if subdata[:4] == b'TRZF':
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firmware = FirmwareImage(data, vheader.hdrlen)
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# check signatures against signing keys in the vendor header
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if firmware.sigmask > 0:
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pk = [vheader.vpub[i] for i in range(8) if firmware.sigmask & (1 << i)]
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global_pk = ed25519cosi.combine_keys(pk)
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hdr = subdata[:IMAGE_HEADER_SIZE - IMAGE_SIG_SIZE] + IMAGE_SIG_SIZE * b'\x00'
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digest = pyblake2.blake2s(hdr).digest()
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try:
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ed25519raw.checkvalid(firmware.sig, digest, global_pk)
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print('Firmware signature OK')
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except:
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print('Firmware signature INCORRECT')
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else:
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print('No firmware signature')
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return firmware
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if magic == b'TRZF':
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return FirmwareImage(data, 0)
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raise Exception('Unknown file format')
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def main():
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if len(sys.argv) < 2:
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print('Usage: binctl file.bin [-s sigmask signature] [-h]')
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return 1
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fn = sys.argv[1]
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sign = len(sys.argv) > 2 and sys.argv[2] == '-s'
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rehash = len(sys.argv) == 3 and sys.argv[2] == '-h'
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b = binopen(fn)
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if sign:
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sigmask = 0
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if ':' in sys.argv[3]:
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for idx in sys.argv[3].split(':'):
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sigmask |= 1 << (int(idx) - 1)
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else:
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sigmask = 1 << (int(sys.argv[3]) - 1)
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signature = binascii.unhexlify(sys.argv[4])
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b.sign(sigmask, signature)
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print()
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b.write(fn)
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if rehash:
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b.update_hashes()
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b.write(fn)
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b.print()
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if __name__ == '__main__':
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main()
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