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apps.fido_u2f: fix authenticate

This commit is contained in:
Jan Pochyla 2017-05-31 13:15:50 +02:00
parent 36fc87bd46
commit 7a5377e385
1 changed files with 14 additions and 6 deletions
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20
src/apps/fido_u2f/__init__.py
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@ -461,15 +461,18 @@ def msg_register_sign(challenge: bytes, app_id: bytes) -> bytes:
_authenticate_state = 0
_authenticate_lastreq = None
async def msg_authenticate(req: Msg) -> Cmd:
global _authenticate_state
global _authenticate_lastreq
from apps.common import storage
if not storage.is_initialized():
log.warning(__name__, 'not initialized')
return msg_error(req, _SW_CONDITIONS_NOT_SATISFIED)
# we need at least keyHandleLen
@ -488,28 +491,33 @@ async def msg_authenticate(req: Msg) -> Cmd:
# check the keyHandle and generate the signing key
node = msg_authenticate_genkey(auth.appId, auth.keyHandle)
if node is None:
# specific error logged in msg_authenticate_genkey
return msg_error(req, _SW_WRONG_DATA)
# if _AUTH_CHECK_ONLY is requested, return, because keyhandle has been checked already
if req.p1 == _AUTH_CHECK_ONLY:
log.warning(__name__, '_SW_CONDITIONS_NOT_SATISFIED')
log.info(__name__, '_AUTH_CHECK_ONLY')
return msg_error(req, _SW_CONDITIONS_NOT_SATISFIED)
# from now on, only _AUTH_ENFORCE is supported
if req.p1 != _AUTH_ENFORCE:
log.warning(__name__, '_SW_WRONG_DATA')
log.info(__name__, '_AUTH_ENFORCE')
return msg_error(req, _SW_WRONG_DATA)
# TODO: check equality with last request
# check equality with last request
if _authenticate_lastreq is None or _authenticate_lastreq.__dict__ != req.__dict__:
_authenticate_lastreq = req
_authenticate_state = 0
# TODO: wait for a button press
if _authenticate_state == 0:
_authenticate_state = utime.ticks_ms()
if utime.ticks_ms() - _authenticate_state < 500:
log.info(__name__, 'waiting for button')
return msg_error(req, _SW_CONDITIONS_NOT_SATISFIED)
_authenticate_state = 0
buf = msg_authenticate_sign(auth.chal, auth.appId, auth.keyHandle)
buf = msg_authenticate_sign(auth.chal, auth.appId, node.private_key())
return Cmd(req.cid, _CMD_MSG, buf)
@ -555,7 +563,7 @@ def msg_authenticate_sign(challenge: bytes, app_id: bytes, privkey: bytes) -> by
global _authenticate_ctr
flags = _AUTH_FLAG_TUP
flags = bytes([_AUTH_FLAG_TUP])
# get next counter
ctr = _authenticate_ctr
@ -576,7 +584,7 @@ def msg_authenticate_sign(challenge: bytes, app_id: bytes, privkey: bytes) -> by
# pack to a response
buf, resp = make_struct(resp_cmd_authenticate(len(sig)))
resp.flags = flags
resp.flags = flags[0]
resp.ctr = ctr
utils.memcpy(resp.sig, 0, sig, 0, len(sig))
resp.status = _SW_NO_ERROR