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ccid.py
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ccid.py
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# Copyright (c) 2014 Yubico AB
# All rights reserved.
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
# Additional permission under GNU GPL version 3 section 7
#
# If you modify this program, or any covered work, by linking or
# combining it with the OpenSSL project's OpenSSL library (or a
# modified version of that library), containing parts covered by the
# terms of the OpenSSL or SSLeay licenses, We grant you additional
# permission to convey the resulting work. Corresponding Source for a
# non-source form of such a combination shall include the source code
# for the parts of OpenSSL used as well as that of the covered work.
from yubioath.yubicommon.compat import byte2int, int2byte
from ..core.exc import CardError, DeviceLockedError
from smartcard.scard import (
SCardTransmit, SCardGetErrorMessage, SCardConnect, SCardDisconnect,
SCardEstablishContext, SCardReleaseContext, SCardListReaders,
SCARD_S_SUCCESS, SCARD_UNPOWER_CARD, SCARD_SCOPE_USER, SCARD_SHARE_SHARED,
SCARD_PROTOCOL_T0, SCARD_PROTOCOL_T1, SCARD_W_RESET_CARD
)
from PyQt5 import QtCore
import threading
class LLScardDevice(object):
"""
Low level pyscard based backend (Windows chokes on the high level one
whenever you remove the key and re-insert it).
"""
def __init__(self, context, card, protocol):
self._context = context
self._card = card
self._protocol = protocol
def send_apdu(self, cl, ins, p1, p2, data):
apdu = [cl, ins, p1, p2, len(data)] + [byte2int(b) for b in data]
hresult, response = SCardTransmit(self._card, self._protocol, apdu)
if hresult == SCARD_W_RESET_CARD:
raise DeviceLockedError()
if hresult != SCARD_S_SUCCESS:
raise CardError(hresult, 'Failed to transmit: ' +
SCardGetErrorMessage(hresult))
status = response[-2] << 8 | response[-1]
return b''.join(int2byte(i) for i in response[:-2]), status
def __del__(self):
self.close()
def close(self):
SCardDisconnect(self._card, SCARD_UNPOWER_CARD)
SCardReleaseContext(self._context)
class PollerThread(threading.Thread):
def __init__(self, watcher):
super(PollerThread, self).__init__()
self._watcher = watcher
self.daemon = True
self.running = True
self.event = threading.Event()
self.poll_interval = 0.5
def run(self):
old_readers = []
while self.running:
readers = self._list()
added = [r for r in readers if r not in old_readers]
removed = [r for r in old_readers if r not in readers]
if added or removed:
self._watcher._update(added, removed)
old_readers = readers
self.event.wait(self.poll_interval)
self.event.clear()
def wake(self):
self.event.set()
def set_poll_interval(self, interval):
self.poll_interval = interval
self.wake()
def _list(self):
try:
hresult, hcontext = SCardEstablishContext(SCARD_SCOPE_USER)
if hresult != SCARD_S_SUCCESS:
raise Exception('Failed to establish context : ' +
SCardGetErrorMessage(hresult))
try:
hresult, readers = SCardListReaders(hcontext, [])
if hresult != SCARD_S_SUCCESS:
raise Exception('Failed to list readers: ' +
SCardGetErrorMessage(hresult))
return readers
finally:
hresult = SCardReleaseContext(hcontext)
if hresult != SCARD_S_SUCCESS:
raise Exception('Failed to release context: ' +
SCardGetErrorMessage(hresult))
except: # noqa: E722
return []
class CardStatus:
NoCard, InUse, Present = range(3)
class CardWatcher(QtCore.QObject):
status_changed = QtCore.pyqtSignal(int)
def __init__(self, reader_name, callback, parent=None):
super(CardWatcher, self).__init__(parent)
self._status = CardStatus.NoCard
self.reader_name = reader_name
self._callback = callback or (lambda _: _)
self._reader = None
self._thread = PollerThread(self)
self._thread.start()
def _update(self, added, removed):
if self._reader in removed: # Device removed
self.reader = None
self._set_status(CardStatus.NoCard)
if self._reader is None:
for reader in added:
if self.reader_name.lower() in reader.lower():
self.reader = reader
self._set_status(CardStatus.Present)
return
@property
def status(self):
return self._status
def _set_status(self, value):
if self._status != value:
self._status = value
self.status_changed.emit(value)
@property
def reader(self):
return self._reader
@reader.setter
def reader(self, value):
self._reader = value
self._callback(self, value)
def open(self):
if self._reader:
try:
hresult, hcontext = SCardEstablishContext(SCARD_SCOPE_USER)
if hresult != SCARD_S_SUCCESS:
raise Exception('Failed to establish context : ' +
SCardGetErrorMessage(hresult))
hresult, hcard, dwActiveProtocol = SCardConnect(
hcontext, self._reader,
SCARD_SHARE_SHARED, SCARD_PROTOCOL_T0 | SCARD_PROTOCOL_T1)
if hresult != SCARD_S_SUCCESS:
raise Exception('Unable to connect: ' +
SCardGetErrorMessage(hresult))
return LLScardDevice(hcontext, hcard, dwActiveProtocol)
except Exception:
self._set_status(CardStatus.InUse)
def passive(self):
self._thread.set_poll_interval(10)
def active(self):
self._thread.set_poll_interval(0.5)
def __del__(self):
self._thread.running = False
self._thread.wake()
self._thread.join()
def ccid_watcher(reader_name='YubiKey', callback=None):
return CardWatcher(reader_name, callback)