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158 lines
4.6 KiB
Python
158 lines
4.6 KiB
Python
import io
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import struct
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import binascii
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from . import util
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from . import formats
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import logging
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log = logging.getLogger(__name__)
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class TrezorLibrary(object):
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@staticmethod
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def client():
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# pylint: disable=import-error
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from trezorlib.client import TrezorClient
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from trezorlib.transport_hid import HidTransport
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devices = HidTransport.enumerate()
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if len(devices) != 1:
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raise ValueError('{:d} Trezor devices found'.format(len(devices)))
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return TrezorClient(HidTransport(devices[0]))
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@staticmethod
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def parse_identity(s):
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# pylint: disable=import-error
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from trezorlib.types_pb2 import IdentityType
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return IdentityType(**_string_to_identity(s))
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class Client(object):
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curve_name = 'nist256p1'
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def __init__(self, factory=TrezorLibrary):
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self.factory = factory
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self.client = self.factory.client()
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f = self.client.features
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log.debug('connected to Trezor %s', f.device_id)
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log.debug('label : %s', f.label)
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log.debug('vendor : %s', f.vendor)
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version = [f.major_version, f.minor_version, f.patch_version]
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log.debug('version : %s', '.'.join([str(v) for v in version]))
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log.debug('revision : %s', binascii.hexlify(f.revision))
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def __enter__(self):
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return self
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def __exit__(self, *args):
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log.info('disconnected from Trezor')
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self.client.clear_session()
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self.client.close()
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def get_identity(self, label):
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return self.factory.parse_identity(label)
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def get_public_key(self, identity):
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label = _identity_to_string(identity)
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log.info('getting "%s" public key from Trezor...', label)
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addr = _get_address(identity)
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node = self.client.get_public_node(addr, self.curve_name)
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pubkey = node.node.public_key
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return formats.export_public_key(pubkey=pubkey, label=label)
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def sign_ssh_challenge(self, label, blob):
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identity = self.factory.parse_identity(label)
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msg = _parse_ssh_blob(blob)
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log.info('confirm user %s connection to %r using Trezor...',
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msg['user'], label)
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s = self.client.sign_identity(identity=identity,
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challenge_hidden=blob,
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challenge_visual='',
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ecdsa_curve_name=self.curve_name)
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assert len(s.signature) == 65
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assert s.signature[0] == b'\x00'
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sig = s.signature[1:]
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r = util.bytes2num(sig[:32])
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s = util.bytes2num(sig[32:])
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return (r, s)
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def _lsplit(s, sep):
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p = None
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if sep in s:
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p, s = s.split(sep, 1)
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return (p, s)
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def _rsplit(s, sep):
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p = None
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if sep in s:
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s, p = s.rsplit(sep, 1)
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return (s, p)
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def _string_to_identity(s):
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proto, s = _lsplit(s, '://')
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user, s = _lsplit(s, '@')
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s, path = _rsplit(s, '/')
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host, port = _rsplit(s, ':')
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if not proto:
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proto = 'ssh' # otherwise, Trezor will use SECP256K1 curve
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result = [
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('proto', proto), ('user', user), ('host', host),
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('port', port), ('path', path)
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]
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return {k: v for k, v in result if v}
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def _identity_to_string(identity):
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result = []
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if identity.proto:
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result.append(identity.proto + '://')
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if identity.user:
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result.append(identity.user + '@')
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result.append(identity.host)
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if identity.port:
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result.append(':' + identity.port)
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if identity.path:
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result.append('/' + identity.path)
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return ''.join(result)
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def _get_address(identity):
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index = struct.pack('<L', identity.index)
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addr = index + _identity_to_string(identity)
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digest = formats.hashfunc(addr).digest()
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s = io.BytesIO(bytearray(digest))
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hardened = 0x80000000
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address_n = [13] + list(util.recv(s, '<LLLL'))
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return [(hardened | value) for value in address_n]
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def _parse_ssh_blob(data):
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res = {}
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if data:
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i = io.BytesIO(data)
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res['nonce'] = util.read_frame(i)
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i.read(1) # TBD
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res['user'] = util.read_frame(i)
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res['conn'] = util.read_frame(i)
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res['auth'] = util.read_frame(i)
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i.read(1) # TBD
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res['key_type'] = util.read_frame(i)
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res['pubkey'] = util.read_frame(i)
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log.debug('%s: user %r via %r (%r)',
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res['conn'], res['user'], res['auth'], res['key_type'])
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log.debug('nonce: %s', binascii.hexlify(res['nonce']))
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pubkey = formats.parse_pubkey(res['pubkey'])
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log.debug('fingerprint: %s', pubkey['fingerprint'])
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return res
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