272 lines
12 KiB
Python
272 lines
12 KiB
Python
import TLV_utils, crypto_utils, utils, pycsc, binascii, fnmatch, sre
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from utils import C_APDU, R_APDU
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DEBUG = True
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#DEBUG = False
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class Card:
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DRIVER_NAME = "Generic"
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APDU_GET_RESPONSE = C_APDU(ins=0xc0)
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APDU_VERIFY_PIN = C_APDU(ins=0x20)
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SW_OK = '\x90\x00'
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SW1_RETRY = 0x61 ## If this SW1 is received then GET RESPONSE should be called with SW2
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## Note: an item in this list must be a tuple of (atr, mask) where atr is a binary
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## string and mask a binary mask. Alternatively mask may be None, then ATR must be a regex
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## to match on the ATRs hexlify representation
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ATRS = []
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## Note: a key in this dictionary may either be a two-byte string containing
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## a binary status word, or a four-byte string containing a hexadecimal
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## status word, possibly with ? characters marking variable nibbles.
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## Hexadecimal characters MUST be in uppercase. The values that four-byte
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## strings map to may be either format strings, that can make use of the
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## keyword substitutions for SW1 and SW2 or a callable accepting two arguments
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## (SW1, SW2) that returns a string.
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STATUS_WORDS = {
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SW_OK: "Normal execution",
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'61??': "%(SW2)i (0x%(SW2)02x) bytes of response data can be retrieved with GetResponse.",
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'6C??': "Bad value for LE, 0x%(SW2)02x is the correct value.",
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'63C?': lambda SW1,SW2: "The counter has reached the value '%i'" % (SW2%16)
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}
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## For the format of this dictionary of dictionaries see TLV_utils.tags
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TLV_OBJECTS = {}
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## Format: "AID (binary)": ("name", [optional: description, {more information}])
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APPLICATIONS = {
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"\xa0\x00\x00\x01\x67\x45\x53\x49\x47\x4e": ("DF.ESIGN", ),
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"\xa0\x00\x00\x00\x63\x50\x4b\x43\x53\x2d\x31\x35": ("DF_PKCS15", ),
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"\xD2\x76\x00\x01\x24\x01": ("DF_OpenPGP", "OpenPGP card", {"significant_length": 6} ),
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"\xa0\x00\x00\x02\x47\x10\x01": (None, "Machine Readable Travel Document"),
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## The following are from 0341a.pdf: BSI-DSZ-CC-0341-2006
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"\xD2\x76\x00\x00\x66\x01": ("DF_SIG", "Signature application", {"fid": "\xAB\x00"}),
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"\xD2\x76\x00\x00\x25\x5A\x41\x02\x00": ("ZA_MF_NEU", "Zusatzanwendungen", {"fid": "\xA7\x00"}),
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"\xD2\x76\x00\x00\x25\x45\x43\x02\x00": ("DF_EC_CASH_NEU", "ec-Cash", {"fid": "\xA1\x00"}),
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"\xD2\x76\x00\x00\x25\x45\x50\x02\x00": ("DF_BOERSE_NEU", "Geldkarte", {"fid": "\xA2\x00"}),
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"\xD2\x76\x00\x00\x25\x47\x41\x01\x00": ("DF_GA_MAESTRO", "GA-Maestro", {"fid": "\xAC\x00"}),
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"\xD2\x76\x00\x00\x25\x54\x44\x01\x00": ("DF_TAN", "TAN-Anwendung", {"fid": "\xAC\x02"}),
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"\xD2\x76\x00\x00\x25\x4D\x01\x02\x00": ("DF_MARKTPLATZ_NEU", "Marktplatz", {"fid": "\xB0\x01"}),
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"\xD2\x76\x00\x00\x25\x46\x53\x02\x00": ("DF_FAHRSCHEIN_NEU", "Fahrschein", {"fid": "\xB0\x00"}),
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"\xD2\x76\x00\x00\x25\x48\x42\x02\x00": ("DF_BANKING_20" , "HBCI", {"fid": "\xA6\x00"}),
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"\xD2\x76\x00\x00\x25\x4E\x50\x01\x00": ("DF_NOTEPAD", "Notepad", {"fid": "\xA6\x10"}),
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}
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# Alias for DF_BOERSE_NEU
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APPLICATIONS["\xA0\x00\x00\x00\x59\x50\x41\x43\x45\x01\x00"] = APPLICATIONS["\xD2\x76\x00\x00\x25\x45\x50\x02\x00"]
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# Alias for DF_GA_MAESTRO
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APPLICATIONS["\xA0\x00\x00\x00\x04\x30\x60"] = APPLICATIONS["\xD2\x76\x00\x00\x25\x47\x41\x01\x00"]
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## Format: "RID (binary)": ("vendor name", [optional: {more information}])
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VENDORS = {
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"\xD2\x76\x00\x01\x24": ("OpenPGP", ),
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"\xD2\x76\x00\x00\x25": ("Bankenverlag", ),
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"\xD2\x76\x00\x00\x60": ("Wolfgang Rankl", ),
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"\xD2\x76\x00\x00\x05": ("Giesecke & Devrient", ),
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"\xD2\x76\x00\x00\x40": ("Zentralinstitut für die Kassenaerztliche Versorgung in der Bundesrepublik Deutschland", ), # hpc-use-cases-01.pdf
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"\xa0\x00\x00\x02\x47": ("ICAO", ),
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}
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def _decode_df_name(self, value):
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result = " " + utils.hexdump(value, short=True)
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info = None
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if self.APPLICATIONS.has_key(value):
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info = self.APPLICATIONS[value]
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else:
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for aid, i in self.APPLICATIONS.items():
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if not len(i) > 2 or not i[2].has_key("significant_length"):
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continue
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if aid[ :i[2]["significant_length"] ] == value[ :i[2]["significant_length"] ]:
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info = i
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break
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result_array = []
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if info is not None:
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if info[0] is not None:
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result_array.append( ("Name", info[0]) )
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if len(info) > 1 and not info[1] is None:
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result_array.append( ("Description", info[1] ) )
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if self.VENDORS.has_key(value[:5]):
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result_array.append( ("Vendor", self.VENDORS[ value[:5] ][0]) )
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if len(result_array) > 0:
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max_len = max( [len(a) for a,b in result_array] + [11] ) + 1
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result = result + "\n" + "\n".join( [("%%-%is %%s" % max_len) % (a+":",b) for a,b in result_array] )
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return result
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def decode_df_name(value):
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# Static method for when there is no object reference
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return Card._decode_df_name(value)
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TLV_OBJECTS[TLV_utils.context_FCP] = {
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0x84: (decode_df_name, "DF name"),
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}
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TLV_OBJECTS[TLV_utils.context_FCI] = TLV_OBJECTS[TLV_utils.context_FCP]
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def __init__(self, card = None, reader = None):
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if card is None:
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if reader is None:
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self.card = pycsc.pycsc(protocol = pycsc.SCARD_PROTOCOL_ANY)
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else:
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self.card = pycsc.pycsc(protocol = pycsc.SCARD_PROTOCOL_ANY, reader = reader)
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else:
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self.card = card
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self._i = 0
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self.last_apdu = None
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self.last_sw = None
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self.last_result = None
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self.sw_changed = False
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def post_merge(self):
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## Called after cards.__init__.Cardmultiplexer._merge_attributes
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self.TLV_OBJECTS[TLV_utils.context_FCP][0x84] = (self._decode_df_name, "DF name")
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self.TLV_OBJECTS[TLV_utils.context_FCI][0x84] = (self._decode_df_name, "DF name")
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def verify_pin(self, pin_number, pin_value):
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apdu = C_APDU(self.APDU_VERIFY_PIN, P2 = pin_number,
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data = pin_value)
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result = self.send_apdu(apdu)
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return result.sw == self.SW_OK
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def cmd_verify(self, pin_number, pin_value):
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"""Verify a PIN."""
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pin_number = int(pin_number, 0)
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pin_value = binascii.a2b_hex("".join(pin_value.split()))
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self.verify_pin(pin_number, pin_value)
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def cmd_reset(self):
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"""Reset the card."""
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self.card.reconnect(init=pycsc.SCARD_RESET_CARD)
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def cmd_parsetlv(self, start = None, end = None):
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"Decode the TLV data in the last response, start and end are optional"
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lastlen = len(self.last_result.data)
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if start is not None:
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start = (lastlen + (int(start,0) % lastlen) ) % lastlen
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else:
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start = 0
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if end is not None:
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end = (lastlen + (int(end,0) % lastlen) ) % lastlen
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else:
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end = lastlen
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print TLV_utils.decode(self.last_result.data[start:end], tags=self.TLV_OBJECTS)
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_SHOW_APPLICATIONS_FORMAT_STRING = "%(aid)-50s %(name)-20s %(description)-30s"
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def cmd_show_applications(self):
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"Show the list of known (by the shell) applications"
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print self._SHOW_APPLICATIONS_FORMAT_STRING % {"aid": "AID", "name": "Name", "description": "Description"}
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foo = self.APPLICATIONS.items()
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foo.sort()
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for aid, info in foo:
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print self._SHOW_APPLICATIONS_FORMAT_STRING % {
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"aid": utils.hexdump(aid, short=True),
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"name": info[0],
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"description": len(info) > 1 and info[1] or ""
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}
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COMMANDS = {
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"reset": cmd_reset,
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"verify": cmd_verify,
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"parse_tlv": cmd_parsetlv,
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"show_applications": cmd_show_applications,
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}
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def _real_send(self, apdu):
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apdu_binary = apdu.render()
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if DEBUG:
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print ">> " + utils.hexdump(apdu_binary, indent = 3)
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result_binary = self.card.transmit(apdu_binary)
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result = R_APDU(result_binary)
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self.last_apdu = apdu
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self.last_sw = result.sw
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self.sw_changed = True
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if DEBUG:
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print "<< " + utils.hexdump(result_binary, indent = 3)
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return result
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def _send_with_retry(self, apdu):
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result = self._real_send(apdu)
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if result.sw1 == self.SW1_RETRY:
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## Need to call GetResponse
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gr_apdu = C_APDU(self.APDU_GET_RESPONSE, le = result.sw2) # FIXME
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result = R_APDU(self._real_send(gr_apdu))
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return result
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def send_apdu(self, apdu):
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if DEBUG:
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print "%s\nBeginning transaction %i" % ('-'*80, self._i)
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if hasattr(self, "before_send"):
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apdu = self.before_send(apdu)
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result = self._send_with_retry(apdu)
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if hasattr(self, "after_send"):
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result = self.after_send(result)
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if DEBUG:
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print "Ending transaction %i\n%s\n" % (self._i, '-'*80)
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self._i = self._i + 1
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self.last_result = result
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return result
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def can_handle(cls, card):
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"""Determine whether this class can handle a given pycsc object."""
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ATR = card.status().get("ATR","")
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for (knownatr, mask) in cls.ATRS:
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if mask is None:
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if sre.match(knownatr, binascii.hexlify(ATR), sre.I):
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return True
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else:
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if len(knownatr) != len(ATR):
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continue
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if crypto_utils.andstring(knownatr, mask) == crypto_utils.andstring(ATR, mask):
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return True
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return False
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can_handle = classmethod(can_handle)
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def get_prompt(self):
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return "(%s)" % self.DRIVER_NAME
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def decode_statusword(self):
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if self.last_sw is None:
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return "No command executed so far"
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else:
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retval = None
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retval = self.STATUS_WORDS.get(self.last_sw)
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if retval is None:
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retval = self.STATUS_WORDS.get(binascii.hexlify(self.last_sw).upper())
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if retval is None:
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target = binascii.b2a_hex(self.last_sw).upper()
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for (key, value) in self.STATUS_WORDS.items():
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if fnmatch.fnmatch(target, key):
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if isinstance(value, str):
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retval = value % { "SW1": ord(self.last_sw[0]),
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"SW2": ord(self.last_sw[1]) }
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break
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elif callable(value):
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retval = value( ord(self.last_sw[0]),
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ord(self.last_sw[1]) )
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break
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if retval is None:
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return "Unknown SW (SW %s)" % binascii.b2a_hex(self.last_sw)
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else:
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return "%s (SW %s)" % (retval, binascii.b2a_hex(self.last_sw))
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def get_protocol(self):
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return ((self.card.status()["Protocol"] == pycsc.SCARD_PROTOCOL_T0) and (0,) or (1,))[0]
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def close_card(self):
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"Disconnect from a card"
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del self.card # FIXME: anything else to do?
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