You cannot select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
trezor-agent/sshagent/trezor.py

86 lines
2.7 KiB
Python

import io
import binascii
from trezorlib.client import TrezorClient
from trezorlib.transport_hid import HidTransport
from trezorlib.types_pb2 import IdentityType
from . import util
from . import formats
import logging
log = logging.getLogger(__name__)
class Client(object):
def __init__(self):
devices = HidTransport.enumerate()
if len(devices) != 1:
raise ValueError('{:d} Trezor devices found'.format(len(devices)))
client = TrezorClient(HidTransport(devices[0]))
f = client.features
log.info('connected to Trezor')
log.debug('ID : {}'.format(f.device_id))
log.debug('label : {}'.format(f.label))
log.debug('vendor : {}'.format(f.vendor))
version = [f.major_version, f.minor_version, f.patch_version]
log.debug('version : {}'.format('.'.join(map(str, version))))
log.debug('revision : {}'.format(binascii.hexlify(f.revision)))
self.client = client
def close(self):
self.client.close()
def get_public_key(self, label):
addr = _get_address(_get_identity(label))
log.info('getting %r SSH public key from Trezor...', label)
node = self.client.get_public_node(addr)
return node.node.public_key
def sign_ssh_challenge(self, label, blob):
ident = _get_identity(label)
msg = _parse_ssh_blob(blob)
request = 'user: "{user}"'.format(**msg)
log.info('confirm %s connection to %r using Trezor...',
request, label)
s = self.client.sign_identity(identity=ident,
challenge_hidden=blob,
challenge_visual=request)
assert len(s.signature) == 64
r = util.bytes2num(s.signature[:32])
s = util.bytes2num(s.signature[32:])
return (r, s)
def _get_identity(label, proto='ssh'):
return IdentityType(host=label, proto=proto)
def _get_address(ident):
index = '\x00' * 4
addr = index + '{}://{}'.format(ident.proto, ident.host)
digest = formats.hashfunc(addr).digest()
s = io.BytesIO(bytearray(digest))
address_n = [13] + list(util.recv(s, '<LLLL'))
return [-a for a in address_n] # prime each address component
def _parse_ssh_blob(data):
res = {}
if data:
i = io.BytesIO(data)
res['nonce'] = util.read_frame(i)
i.read(1) # TBD
res['user'] = util.read_frame(i)
res['conn'] = util.read_frame(i)
res['auth'] = util.read_frame(i)
i.read(1) # TBD
res['key_type'] = util.read_frame(i)
res['pubkey'] = util.read_frame(i)
log.debug('%s: user %r via %r (%r)',
res['conn'], res['user'], res['auth'], res['key_type'])
return res