PyScard Windows Issue demo

PyscardIssue.py

# Demonstration of the issue "Smart Card Resource Manager has shut down",
# appears when disconnecting all readers before reconnect to a card.


from smartcard.System import readers
from smartcard.CardType import ATRCardType
from smartcard.CardRequest import CardRequest
from smartcard.util import toBytes
from smartcard.Exceptions import CardRequestTimeoutException


YUBICO5_ATR_HEX = toBytes("3BFD1300008131FE158073C021C057597562694B657940")
YUBICO_MGMT_APPID = toBytes("00A4040008A000000527471117")


def get_yubico5_serial(conn):
    # For Yubico 5 use the YubiKey Management app
    GETserialY5 = [0x00, 0x1D, 0x00, 0x00]
    data, sw1, sw2 = conn.transmit(YUBICO_MGMT_APPID)
    if sw1 != 0x90 or sw2 != 0x00:
        return 0
    data, sw1, sw2 = conn.transmit(GETserialY5)
    if sw1 != 0x90 or sw2 != 0x00:
        return 0
    if len(data) >= 15 and data[10] == 0x04:
        sn = 0
        for snd in data[11:15]:
            sn = (sn << 8) + snd
        return sn
    else:
        return 0


def get_yubico_serial():
    piv_card_atr = ATRCardType(YUBICO5_ATR_HEX)

    #   With the following line added (uncommented), it doesn't throw
    #   the "Smart Card Resource Manager has shut down" exception :
    # readers()
    #  Similarly, with createConnection to get the connection from
    #  a reader, it doesn't fail.

    try:
        cardrequest = CardRequest(timeout=2, cardType=piv_card_atr)
        cardservice = cardrequest.waitforcard()
    except CardRequestTimeoutException:
        return 0
    cardservice.connection.connect()

    return get_yubico5_serial(cardservice.connection)


def print_yubis():
    print("")
    yubi_SN = get_yubico_serial()
    if yubi_SN > 0:
        print("A YubiKey detected :")
        print(f" - SN {yubi_SN}")
    else:
        print("No Yubikey detected")
    return yubi_SN > 0


input("\nConnect a YubiKey, and press RETURN")
yubn_detect = print_yubis()
if yubn_detect == 0:
    print("Connect a YubiKey to perform the test.")
else:
    input("\nDisconnect all the reader, all Yubikeys, and press RETURN")
    input("\nReconnect a Yubikey, and press RETURN")
    print_yubis()