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git-svn-id: https://vsmartcard.svn.sourceforge.net/svnroot/vsmartcard@666 96b47cad-a561-4643-ad3b-153ac7d7599c
This commit is contained in:
frankmorgner
2011-12-09 20:21:45 +00:00
parent 7ac1760a15
commit 899ea104c6
1 changed files with 19 additions and 9 deletions
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28
virtualsmartcard/src/vpicc/virtualsmartcard/VirtualSmartcard.py
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@@ -393,24 +393,26 @@ class RelayOS(SmartcardOS):
"""
This class implements relaying of a (physical) smartcard. The RelayOS
forwards the command APDUs received from the vpcd to the real smartcard via
an actual smartcard reader and sends the responses back to the vpcd.
This class can be used to implement relay or MITM attacks.
an actual smart card reader and sends the responses back to the vpcd.
This class can be used to implement relay or MitM attacks.
"""
def __init__(self, readernum):
"""
Initialize the connection to the (physical) smartcard via a given reader
Initialize the connection to the (physical) smart card via a given reader
"""
# See which readers are available
readers = smartcard.System.listReaders()
if len(readers) <= readernum:
logging.error("Invalid number of reader '%u' (only %u available)",
readernum, len(readers))
sys.exit()
# Connect to the reader and its card
# XXX this is a workaround, see on sourceforge bug #3083254
# should better use
# self.reader = smartcard.System.readers()[readernum]
self.reader = readers[readernum]
# set exit to True if you want to terminate relaying
self.exit = False
try:
self.session = smartcard.Session(self.reader)
except smartcard.Exceptions.CardConnectionException, e:
@@ -431,10 +433,13 @@ class RelayOS(SmartcardOS):
logging.warning("Error disconnecting from card: %s", e.message)
def getATR(self):
# when powerDown has been called, fetching the ATR will throw an error.
# In this case we must try to reconnect (and then get the ATR).
try:
atr = self.session.getATR()
except smartcard.Exceptions.CardConnectionException, e:
try:
# Try to reconnect to the card
self.session.close()
self.session = smartcard.Session(self.reader)
atr = self.session.getATR()
@@ -445,6 +450,10 @@ class RelayOS(SmartcardOS):
return "".join([chr(b) for b in atr])
def powerUp(self):
# When powerUp is called multiple times the session is valid (and the
# card is implicitly powered) we can check for an ATR. But when
# powerDown has been called, the session gets lost. In this case we
# must try to reconnect (and power the card).
try:
self.session.getATR()
except smartcard.Exceptions.CardConnectionException, e:
@@ -455,6 +464,8 @@ class RelayOS(SmartcardOS):
sys.exit()
def powerDown(self):
# There is no power down in the session context so we simply
# disconnect, which should implicitly power down the card.
try:
self.session.close()
except smartcard.Exceptions.CardConnectionException, e:
@@ -462,10 +473,8 @@ class RelayOS(SmartcardOS):
sys.exit()
def execute(self, msg):
#apdu = [].append(ord(b) for b in msg)
apdu = []
for b in msg:
apdu.append(ord(b))
# sendCommandAPDU() expects a list of APDU bytes
apdu = list(bytes(msg))
try:
rapdu, sw1, sw2 = self.session.sendCommandAPDU(apdu)
@@ -481,6 +490,7 @@ class RelayOS(SmartcardOS):
else:
rapdu = rapdu + [sw1, sw2]
# return the response APDU as string
return "".join([chr(b) for b in rapdu])