mirror of https://gerrit.osmocom.org/pysim
91 lines
3.3 KiB
Python
91 lines
3.3 KiB
Python
# coding=utf-8
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# (C) 2022 by 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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import sys
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import logging
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from pprint import pprint as pp
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from typing import Tuple
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import pyshark
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from pySim.utils import h2b, b2h
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from pySim.apdu import Tpdu
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from pySim.gsmtap import GsmtapMessage
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from . import ApduSource, PacketType, CardReset
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from pySim.apdu.ts_102_221 import ApduCommands as UiccApduCommands
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from pySim.apdu.ts_31_102 import ApduCommands as UsimApduCommands
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from pySim.apdu.global_platform import ApduCommands as GpApduCommands
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ApduCommands = UiccApduCommands + UsimApduCommands + GpApduCommands
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logger = logging.getLogger(__name__)
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class _PysharkGsmtap(ApduSource):
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"""APDU Source [provider] base class for reading GSMTAP SIM APDU via tshark."""
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def __init__(self, pyshark_inst):
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self.pyshark = pyshark_inst
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self.bank_id = None
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self.bank_slot = None
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self.cmd_tpdu = None
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super().__init__()
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def read_packet(self) -> PacketType:
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p = self.pyshark.next()
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return self._parse_packet(p)
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def _set_or_verify_bank_slot(self, bsl: Tuple[int, int]):
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"""Keep track of the bank:slot to make sure we don't mix traces of multiple cards"""
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if not self.bank_id:
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self.bank_id = bsl[0]
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self.bank_slot = bsl[1]
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else:
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if self.bank_id != bsl[0] or self.bank_slot != bsl[1]:
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raise ValueError('Received data for unexpected B(%u:%u)' % (bsl[0], bsl[1]))
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def _parse_packet(self, p) -> PacketType:
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udp_layer = p['udp']
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udp_payload_hex = udp_layer.get_field('payload').replace(':','')
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gsmtap = GsmtapMessage(h2b(udp_payload_hex))
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gsmtap_msg = gsmtap.decode()
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if gsmtap_msg['type'] != 'sim':
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raise ValueError('Unsupported GSMTAP type %s' % gsmtap_msg['type'])
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sub_type = gsmtap_msg['sub_type']
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if sub_type == 'apdu':
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return ApduCommands.parse_cmd_bytes(gsmtap_msg['body'])
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elif sub_type == 'atr':
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# card has been reset
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return CardReset()
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elif sub_type in ['pps_req', 'pps_rsp']:
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# simply ignore for now
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pass
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else:
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raise ValueError('Unsupported GSMTAP-SIM sub-type %s' % sub_type)
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class PysharkGsmtapPcap(_PysharkGsmtap):
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"""APDU Source [provider] class for reading GSMTAP from a PCAP
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file via pyshark, which in turn uses tshark (part of wireshark).
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"""
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def __init__(self, pcap_filename):
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"""
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Args:
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pcap_filename: File name of the pcap file to be opened
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"""
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pyshark_inst = pyshark.FileCapture(pcap_filename, display_filter='gsm_sim', use_json=True, keep_packets=False)
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super().__init__(pyshark_inst)
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