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7328f10165
There may be corner cases where an execption contains no error message. In this case it might still be helpful to display the type of the exeption calss to get at least an idea of what kind of error we are dealing with. Change-Id: I6e6b3acd17e40934050b9b088960a2f851120b26
242 lines
8.5 KiB
Python
242 lines
8.5 KiB
Python
# -*- coding: utf-8 -*-
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""" pySim: PCSC reader transport link base
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"""
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import abc
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import argparse
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from typing import Optional, Tuple
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from pySim.exceptions import *
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from pySim.construct import filter_dict
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from pySim.utils import sw_match, b2h, h2b, i2h
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#
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# Copyright (C) 2009-2010 Sylvain Munaut <tnt@246tNt.com>
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# Copyright (C) 2021 Harald Welte <laforge@osmocom.org>
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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class ApduTracer:
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def trace_command(self, cmd):
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pass
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def trace_response(self, cmd, sw, resp):
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pass
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class LinkBase(abc.ABC):
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"""Base class for link/transport to card."""
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def __init__(self, sw_interpreter=None, apdu_tracer=None):
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self.sw_interpreter = sw_interpreter
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self.apdu_tracer = apdu_tracer
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@abc.abstractmethod
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def _send_apdu_raw(self, pdu:str) -> Tuple[str, str]:
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"""Implementation specific method for sending the PDU."""
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def set_sw_interpreter(self, interp):
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"""Set an (optional) status word interpreter."""
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self.sw_interpreter = interp
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@abc.abstractmethod
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def wait_for_card(self, timeout:int=None, newcardonly:bool=False):
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"""Wait for a card and connect to it
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Args:
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timeout : Maximum wait time in seconds (None=no timeout)
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newcardonly : Should we wait for a new card, or an already inserted one ?
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"""
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@abc.abstractmethod
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def connect(self):
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"""Connect to a card immediately
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"""
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@abc.abstractmethod
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def disconnect(self):
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"""Disconnect from card
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"""
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@abc.abstractmethod
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def reset_card(self):
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"""Resets the card (power down/up)
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"""
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def send_apdu_raw(self, pdu:str):
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"""Sends an APDU with minimal processing
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Args:
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pdu : string of hexadecimal characters (ex. "A0A40000023F00")
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Returns:
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tuple(data, sw), where
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data : string (in hex) of returned data (ex. "074F4EFFFF")
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sw : string (in hex) of status word (ex. "9000")
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"""
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if self.apdu_tracer:
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self.apdu_tracer.trace_command(pdu)
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(data, sw) = self._send_apdu_raw(pdu)
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if self.apdu_tracer:
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self.apdu_tracer.trace_response(pdu, sw, data)
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return (data, sw)
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def send_apdu(self, pdu):
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"""Sends an APDU and auto fetch response data
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Args:
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pdu : string of hexadecimal characters (ex. "A0A40000023F00")
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Returns:
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tuple(data, sw), where
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data : string (in hex) of returned data (ex. "074F4EFFFF")
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sw : string (in hex) of status word (ex. "9000")
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"""
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data, sw = self.send_apdu_raw(pdu)
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# When whe have sent the first APDU, the SW may indicate that there are response bytes
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# available. There are two SWs commonly used for this 9fxx (sim) and 61xx (usim), where
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# xx is the number of response bytes available.
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# See also:
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if (sw is not None):
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if ((sw[0:2] == '9f') or (sw[0:2] == '61')):
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# SW1=9F: 3GPP TS 51.011 9.4.1, Responses to commands which are correctly executed
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# SW1=61: ISO/IEC 7816-4, Table 5 — General meaning of the interindustry values of SW1-SW2
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pdu_gr = pdu[0:2] + 'c00000' + sw[2:4]
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data, sw = self.send_apdu_raw(pdu_gr)
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if sw[0:2] == '6c':
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# SW1=6C: ETSI TS 102 221 Table 7.1: Procedure byte coding
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pdu_gr = pdu[0:8] + sw[2:4]
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data,sw = self.send_apdu_raw(pdu_gr)
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return data, sw
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def send_apdu_checksw(self, pdu, sw="9000"):
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"""Sends an APDU and check returned SW
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Args:
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pdu : string of hexadecimal characters (ex. "A0A40000023F00")
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sw : string of 4 hexadecimal characters (ex. "9000"). The user may mask out certain
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digits using a '?' to add some ambiguity if needed.
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Returns:
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tuple(data, sw), where
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data : string (in hex) of returned data (ex. "074F4EFFFF")
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sw : string (in hex) of status word (ex. "9000")
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"""
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rv = self.send_apdu(pdu)
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if not sw_match(rv[1], sw):
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raise SwMatchError(rv[1], sw.lower(), self.sw_interpreter)
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return rv
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def send_apdu_constr(self, cla, ins, p1, p2, cmd_constr, cmd_data, resp_constr):
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"""Build and sends an APDU using a 'construct' definition; parses response.
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Args:
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cla : string (in hex) ISO 7816 class byte
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ins : string (in hex) ISO 7816 instruction byte
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p1 : string (in hex) ISO 7116 Parameter 1 byte
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p2 : string (in hex) ISO 7116 Parameter 2 byte
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cmd_cosntr : defining how to generate binary APDU command data
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cmd_data : command data passed to cmd_constr
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resp_cosntr : defining how to decode binary APDU response data
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Returns:
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Tuple of (decoded_data, sw)
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"""
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cmd = cmd_constr.build(cmd_data) if cmd_data else ''
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p3 = i2h([len(cmd)])
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pdu = ''.join([cla, ins, p1, p2, p3, b2h(cmd)])
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(data, sw) = self.send_apdu(pdu)
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if data:
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# filter the resulting dict to avoid '_io' members inside
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rsp = filter_dict(resp_constr.parse(h2b(data)))
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else:
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rsp = None
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return (rsp, sw)
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def send_apdu_constr_checksw(self, cla, ins, p1, p2, cmd_constr, cmd_data, resp_constr,
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sw_exp="9000"):
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"""Build and sends an APDU using a 'construct' definition; parses response.
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Args:
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cla : string (in hex) ISO 7816 class byte
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ins : string (in hex) ISO 7816 instruction byte
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p1 : string (in hex) ISO 7116 Parameter 1 byte
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p2 : string (in hex) ISO 7116 Parameter 2 byte
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cmd_cosntr : defining how to generate binary APDU command data
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cmd_data : command data passed to cmd_constr
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resp_cosntr : defining how to decode binary APDU response data
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exp_sw : string (in hex) of status word (ex. "9000")
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Returns:
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Tuple of (decoded_data, sw)
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"""
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(rsp, sw) = self.send_apdu_constr(cla, ins, p1, p2, cmd_constr, cmd_data, resp_constr)
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if not sw_match(sw, sw_exp):
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raise SwMatchError(sw, sw_exp.lower(), self.sw_interpreter)
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return (rsp, sw)
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def argparse_add_reader_args(arg_parser):
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"""Add all reader related arguments to the given argparse.Argumentparser instance."""
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serial_group = arg_parser.add_argument_group('Serial Reader')
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serial_group.add_argument('-d', '--device', metavar='DEV', default='/dev/ttyUSB0',
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help='Serial Device for SIM access')
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serial_group.add_argument('-b', '--baud', dest='baudrate', type=int, metavar='BAUD', default=9600,
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help='Baud rate used for SIM access')
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pcsc_group = arg_parser.add_argument_group('PC/SC Reader')
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pcsc_group.add_argument('-p', '--pcsc-device', type=int, dest='pcsc_dev', metavar='PCSC', default=None,
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help='PC/SC reader number to use for SIM access')
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modem_group = arg_parser.add_argument_group('AT Command Modem Reader')
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modem_group.add_argument('--modem-device', dest='modem_dev', metavar='DEV', default=None,
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help='Serial port of modem for Generic SIM Access (3GPP TS 27.007)')
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modem_group.add_argument('--modem-baud', type=int, metavar='BAUD', default=115200,
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help='Baud rate used for modem port')
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osmobb_group = arg_parser.add_argument_group('OsmocomBB Reader')
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osmobb_group.add_argument('--osmocon', dest='osmocon_sock', metavar='PATH', default=None,
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help='Socket path for Calypso (e.g. Motorola C1XX) based reader (via OsmocomBB)')
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return arg_parser
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def init_reader(opts, **kwargs) -> Optional[LinkBase]:
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"""
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Init card reader driver
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"""
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sl = None # type : :Optional[LinkBase]
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try:
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if opts.pcsc_dev is not None:
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print("Using PC/SC reader interface")
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from pySim.transport.pcsc import PcscSimLink
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sl = PcscSimLink(opts.pcsc_dev, **kwargs)
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elif opts.osmocon_sock is not None:
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print("Using Calypso-based (OsmocomBB) reader interface")
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from pySim.transport.calypso import CalypsoSimLink
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sl = CalypsoSimLink(sock_path=opts.osmocon_sock, **kwargs)
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elif opts.modem_dev is not None:
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print("Using modem for Generic SIM Access (3GPP TS 27.007)")
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from pySim.transport.modem_atcmd import ModemATCommandLink
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sl = ModemATCommandLink(device=opts.modem_dev, baudrate=opts.modem_baud, **kwargs)
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else: # Serial reader is default
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print("Using serial reader interface")
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from pySim.transport.serial import SerialSimLink
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sl = SerialSimLink(device=opts.device, baudrate=opts.baudrate, **kwargs)
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return sl
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except Exception as e:
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if str(e):
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print("Card reader initialization failed with exception:\n" + str(e))
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else:
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print("Card reader initialization failed with an exception of type:\n" + str(type(e)))
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return None
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