Re: Bug in reconnecting to a card.

"Abraham Macias Paredes" <[email protected]> Fri, 23 Sep 2016 14:49:55 +0200

Newsgroups	gmane.comp.lib.muscle
Message-ID	<[email protected]>

Hi again, 

 After some tests I think that a second “Connect” invalidates the transactions (Python test attached).

 

Or maybe there are a couple of seconds of timeout before invalidating the transactions and allowing the connection (because when you run the test you can notice a couple of seconds of delay before the second “connect”).

 

The output of the test in my Windows 10 is:

 

c:\Python27>python.exe test.py

Context established!

PCSC Readers: ['Dell Smart Card Reader Keyboard 0']

Using reader: Dell Smart Card Reader Keyboard 0

Connected with active protocol 1

Start transaction

Connect again

Connected with active protocol 1

Start transaction (card 2)

End transaction (card 2)

End transaction in the first connection

Exception: failed to end a transaction: Se ha reiniciado la tarjeta inteligente, por lo que no es vßlida ninguna informaci¾n de estado compartido.

Released context.

press Enter to continue

 

Best regards!

 

 

De: Pcsclite-muscle [mailto:pcsclite-muscle-bounces+amacias=solutia-it.es@lists.alioth.debian.org] En nombre de Abraham Macias Paredes
Enviado el: viernes, 23 de septiembre de 2016 13:31
Para: 'Talks about MUSCLE' <[email protected]>
Asunto: Re: [Pcsclite-muscle] Bug in reconnecting to a card.

 

Hi,

*         Do you get the same behavior on Windows?
No, in Windows seems that “disconnect” and “reconnect” ends all started transactions.

*         What should be the correct behavior of pcsc-lite?
I think that is logical to think that when you “reconnect” or “disconnect” a card, all estarted transactions are ended.

Thank you and best regards!

 

 

De: Pcsclite-muscle [mailto:pcsclite-muscle-bounces+amacias=solutia-it.es@lists.alioth.debian.org] En nombre de Ludovic Rousseau
Enviado el: viernes, 23 de septiembre de 2016 12:54
Para: Talks about MUSCLE <[email protected] <mailto:[email protected]> >
Asunto: Re: [Pcsclite-muscle] Bug in reconnecting to a card.

 

2016-09-23 12:45 GMT+02:00 Abraham Macias Paredes <[email protected] <mailto:[email protected]> >:

Hi PCSC lite Project people,

 

Hello,
 

  I’m developing a software that nowadays is not stable (my software is buggy), but I detected that a bug in my software causes a bug in pcsc-lite.

 

The “SCardReconnect” doesn’t check if the connection has a transaction opened. So if you open a transtaction and reconnects the transaction is still opened. And also you can open a new transaction. 

 

Interesting.

Do you get the same behavior on Windows?

What should be the correct behavior of pcsc-lite?

Bye

 

-- 

 Dr. Ludovic Rousseau

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test.py (text/plain, 3.2 KB)

#! /usr/bin/env python

from smartcard.scard import *
import smartcard.util

SELECT = [0x00, 0xA4, 0x04, 0x00, 0x0A, 0xA0, 0x00, 0x00, 0x00, 0x62,
    0x03, 0x01, 0x0C, 0x06, 0x01]
COMMAND = [0x00, 0x00, 0x00, 0x00]

try:
    hresult, hcontext = SCardEstablishContext(SCARD_SCOPE_USER)
    if hresult != SCARD_S_SUCCESS:
        raise Exception('Failed to establish context : ' +
            SCardGetErrorMessage(hresult))
    print 'Context established!'

    try:
        hresult, readers = SCardListReaders(hcontext, [])
        if hresult != SCARD_S_SUCCESS:
            raise Exception('Failed to list readers: ' +
                SCardGetErrorMessage(hresult))
        print 'PCSC Readers:', readers

        if len(readers) < 1:
            raise Exception('No smart card readers')

        reader = readers[0]
        print "Using reader:", reader

        try:
            hresult, hcard, dwActiveProtocol = SCardConnect(hcontext, reader,
                SCARD_SHARE_SHARED, SCARD_PROTOCOL_T0 | SCARD_PROTOCOL_T1)
            if hresult != SCARD_S_SUCCESS:
                raise Exception('Unable to connect: ' +
                    SCardGetErrorMessage(hresult))
            print 'Connected with active protocol', dwActiveProtocol

            print "Start transaction"
            hresult = SCardBeginTransaction(hcard)
            if hresult != SCARD_S_SUCCESS:
                raise error, 'failed to begin a transaction: ' + SCardGetErrorMessage(hresult)
            
            print "Connect again"
            hresult, hcard2, dwActiveProtocol = SCardConnect(hcontext, reader,
                SCARD_SHARE_SHARED, SCARD_PROTOCOL_T0 | SCARD_PROTOCOL_T1)
            if hresult != SCARD_S_SUCCESS:
                raise Exception('Unable to connect: ' +
                    SCardGetErrorMessage(hresult))
            print 'Connected with active protocol', dwActiveProtocol
            
            
            print "Start transaction (card 2)"
            hresult = SCardBeginTransaction(hcard2)
            if hresult != SCARD_S_SUCCESS:
                raise error, 'failed to begin a transaction: ' + SCardGetErrorMessage(hresult)

            print 'End transaction (card 2)'
            hresult = SCardEndTransaction(hcard2, SCARD_LEAVE_CARD)
            if hresult != SCARD_S_SUCCESS:
                raise error, 'failed to end a transaction: ' + SCardGetErrorMessage(hresult)

                
            print 'End transaction in the first connection'
            hresult = SCardEndTransaction(hcard, SCARD_LEAVE_CARD)
            if hresult != SCARD_S_SUCCESS:
                raise error, 'failed to end a transaction: ' + SCardGetErrorMessage(hresult)
            
            
            

            
            
        except Exception, message:
            print "Exception:", message

    finally:
        hresult = SCardReleaseContext(hcontext)
        if hresult != SCARD_S_SUCCESS:
            raise Exception('Failed to release context: ' +
                    SCardGetErrorMessage(hresult))
        print 'Released context.'

except Exception, message:
    print "Exception:", message

import sys
if 'win32' == sys.platform:
    print 'press Enter to continue'
    sys.stdin.read(1)