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pySim/transport add support for T=1 protocol and fix APDU/TPDU layer conflicts

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ETSI TS 102 221, section 7.3 specifies that UICCs (and eUICCs) may support two
different transport protocols: T=0 or T=1 or both. The spec also says that the
terminal must support both protocols.

This patch adds the necessary functionality to support the T=1 protocol
alongside the T=0 protocol. However, this also means that we have to sharpen
the lines between APDUs and TPDUs.

As this patch also touches the low level interface to readers it was also
manually tested with a classic serial reader. Calypso and AT command readers
were not tested.

Change-Id: I8b56d7804a2b4c392f43f8540e0b6e70001a8970
Related: OS#6367
This commit is contained in:
Philipp Maier
2024-10-28 17:28:43 +01:00
parent f951c56449
commit 852eff54df
25 changed files with 606 additions and 144 deletions
Download Patch File Download Diff File Expand all files Collapse all files

163
pySim/transport/__init__.py
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@@ -11,7 +11,7 @@ from construct import Construct
from osmocom.utils import b2h, h2b, i2h, Hexstr
from pySim.exceptions import *
from pySim.utils import SwHexstr, SwMatchstr, ResTuple, sw_match
from pySim.utils import SwHexstr, SwMatchstr, ResTuple, sw_match, parse_command_apdu
from pySim.cat import ProactiveCommand, CommandDetails, DeviceIdentities, Result
#
@@ -90,14 +90,16 @@ class LinkBase(abc.ABC):
self.sw_interpreter = sw_interpreter
self.apdu_tracer = apdu_tracer
self.proactive_handler = proactive_handler
self.apdu_strict = False
@abc.abstractmethod
def __str__(self) -> str:
"""Implementation specific method for printing an information to identify the device."""
@abc.abstractmethod
def _send_apdu_raw(self, pdu: Hexstr) -> ResTuple:
"""Implementation specific method for sending the PDU."""
def _send_apdu(self, apdu: Hexstr) -> ResTuple:
"""Implementation specific method for sending the APDU. This method must accept APDUs as defined in
ISO/IEC 7816-3, section 12.1 """
def set_sw_interpreter(self, interp):
"""Set an (optional) status word interpreter."""
@@ -134,61 +136,51 @@ class LinkBase(abc.ABC):
self.apdu_tracer.trace_reset()
return self._reset_card()
def send_apdu_raw(self, pdu: Hexstr) -> ResTuple:
def send_apdu(self, apdu: Hexstr) -> ResTuple:
"""Sends an APDU with minimal processing
Args:
pdu : string of hexadecimal characters (ex. "A0A40000023F00")
apdu : string of hexadecimal characters (ex. "A0A40000023F00", must comply to ISO/IEC 7816-3, section 12.1)
Returns:
tuple(data, sw), where
data : string (in hex) of returned data (ex. "074F4EFFFF")
sw : string (in hex) of status word (ex. "9000")
"""
# To make sure that no invalid APDUs can be passed further down into the transport layer, we parse the APDU.
(case, _lc, _le, _data) = parse_command_apdu(h2b(apdu))
if self.apdu_tracer:
self.apdu_tracer.trace_command(pdu)
(data, sw) = self._send_apdu_raw(pdu)
self.apdu_tracer.trace_command(apdu)
# Handover APDU to concrete transport layer implementation
(data, sw) = self._send_apdu(apdu)
if self.apdu_tracer:
self.apdu_tracer.trace_response(pdu, sw, data)
self.apdu_tracer.trace_response(apdu, sw, data)
# The APDU case (See aso ISO/IEC 7816-3, table 12) dictates if we should receive a response or not. If we
# receive a response in an APDU case that does not allow the reception of a respnse we print a warning to
# make the user/caller aware of the problem. Since the transaction is over at this point and data was received
# we count it as a successful transaction anyway, even though the spec was violated. The problem is most likely
# caused by a missing Le field in the APDU. This is an error that the caller/user should correct to avoid
# problems at some later point when a different transport protocol or transport layer implementation is used.
# All APDUs passed to this function must comply to ISO/IEC 7816-3, section 12.
if len(data) > 0 and (case == 3 or case == 1):
exeption_str = 'received unexpected response data, incorrect APDU-case ' + \
'(%d, should be %d, missing Le field?)!' % (case, case + 1)
if self.apdu_strict:
raise ValueError(exeption_str)
else:
print('Warning: %s' % exeption_str)
return (data, sw)
def send_apdu(self, pdu: Hexstr) -> ResTuple:
"""Sends an APDU and auto fetch response data
Args:
pdu : string of hexadecimal characters (ex. "A0A40000023F00")
Returns:
tuple(data, sw), where
data : string (in hex) of returned data (ex. "074F4EFFFF")
sw : string (in hex) of status word (ex. "9000")
"""
prev_pdu = pdu
data, sw = self.send_apdu_raw(pdu)
# When we have sent the first APDU, the SW may indicate that there are response bytes
# available. There are two SWs commonly used for this 9fxx (sim) and 61xx (usim), where
# xx is the number of response bytes available.
# See also:
if sw is not None:
while (sw[0:2] in ['9f', '61', '62', '63']):
# SW1=9F: 3GPP TS 51.011 9.4.1, Responses to commands which are correctly executed
# SW1=61: ISO/IEC 7816-4, Table 5 — General meaning of the interindustry values of SW1-SW2
# SW1=62: ETSI TS 102 221 7.3.1.1.4 Clause 4b): 62xx, 63xx, 9xxx != 9000
pdu_gr = pdu[0:2] + 'c00000' + sw[2:4]
prev_pdu = pdu_gr
d, sw = self.send_apdu_raw(pdu_gr)
data += d
if sw[0:2] == '6c':
# SW1=6C: ETSI TS 102 221 Table 7.1: Procedure byte coding
pdu_gr = prev_pdu[0:8] + sw[2:4]
data, sw = self.send_apdu_raw(pdu_gr)
return data, sw
def send_apdu_checksw(self, pdu: Hexstr, sw: SwMatchstr = "9000") -> ResTuple:
def send_apdu_checksw(self, apdu: Hexstr, sw: SwMatchstr = "9000") -> ResTuple:
"""Sends an APDU and check returned SW
Args:
pdu : string of hexadecimal characters (ex. "A0A40000023F00")
apdu : string of hexadecimal characters (ex. "A0A40000023F00", must comply to ISO/IEC 7816-3, section 12.1)
sw : string of 4 hexadecimal characters (ex. "9000"). The user may mask out certain
digits using a '?' to add some ambiguity if needed.
Returns:
@@ -196,7 +188,7 @@ class LinkBase(abc.ABC):
data : string (in hex) of returned data (ex. "074F4EFFFF")
sw : string (in hex) of status word (ex. "9000")
"""
rv = self.send_apdu(pdu)
rv = self.send_apdu(apdu)
last_sw = rv[1]
while sw == '9000' and sw_match(last_sw, '91xx'):
@@ -247,6 +239,89 @@ class LinkBase(abc.ABC):
raise SwMatchError(rv[1], sw.lower(), self.sw_interpreter)
return rv
class LinkBaseTpdu(LinkBase):
# Use the T=0 TPDU format by default as this is the most commonly used transport protocol.
protocol = 0
def set_tpdu_format(self, protocol: int):
"""Set TPDU format. Each transport protocol has its specific TPDU format. This method allows the
concrete transport layer implementation to set the TPDU format it expects. (This method must not be
called by higher layers. Switching the TPDU format does not switch the transport protocol that the
reader uses on the wire)
Args:
protocol : number of the transport protocol used. (0 => T=0, 1 => T=1)
"""
self.protocol = protocol
@abc.abstractmethod
def send_tpdu(self, tpdu: Hexstr) -> ResTuple:
"""Implementation specific method for sending the resulting TPDU. This method must accept TPDUs as defined in
ETSI TS 102 221, section 7.3.1 and 7.3.2, depending on the protocol selected. """
def _send_apdu(self, apdu: Hexstr) -> ResTuple:
"""Transforms APDU into a TPDU and sends it. The response TPDU is returned as APDU back to the caller.
Args:
apdu : string of hexadecimal characters (eg. "A0A40000023F00", must comply to ISO/IEC 7816-3, section 12)
Returns:
tuple(data, sw), where
data : string (in hex) of returned data (ex. "074F4EFFFF")
sw : string (in hex) of status word (ex. "9000")
"""
if self.protocol == 0:
return self.__send_apdu_T0(apdu)
elif self.protocol == 1:
return self.__send_apdu_transparent(apdu)
raise ValueError('unspported protocol selected (T=%d)' % self.protocol)
def __send_apdu_T0(self, apdu: Hexstr) -> ResTuple:
# Transform the given APDU to the T=0 TPDU format and send it. Automatically fetch the response (case #4 APDUs)
# (see also ETSI TS 102 221, section 7.3.1.1)
# Transform APDU to T=0 TPDU (see also ETSI TS 102 221, section 7.3.1)
(case, _lc, _le, _data) = parse_command_apdu(h2b(apdu))
if case == 1:
# Attach an Le field to all case #1 APDUs (see also ETSI TS 102 221, section 7.3.1.1.1)
tpdu = apdu + '00'
elif case == 4:
# Remove the Le field from all case #4 APDUs (see also ETSI TS 102 221, section 7.3.1.1.4)
tpdu = apdu[:-2]
else:
tpdu = apdu
prev_tpdu = tpdu
data, sw = self.send_tpdu(tpdu)
# When we have sent the first APDU, the SW may indicate that there are response bytes
# available. There are two SWs commonly used for this 9fxx (sim) and 61xx (usim), where
# xx is the number of response bytes available.
# See also:
if sw is not None:
while (sw[0:2] in ['9f', '61', '62', '63']):
# SW1=9F: 3GPP TS 51.011 9.4.1, Responses to commands which are correctly executed
# SW1=61: ISO/IEC 7816-4, Table 5 — General meaning of the interindustry values of SW1-SW2
# SW1=62: ETSI TS 102 221 7.3.1.1.4 Clause 4b): 62xx, 63xx, 9xxx != 9000
tpdu_gr = tpdu[0:2] + 'c00000' + sw[2:4]
prev_tpdu = tpdu_gr
d, sw = self.send_tpdu(tpdu_gr)
data += d
if sw[0:2] == '6c':
# SW1=6C: ETSI TS 102 221 Table 7.1: Procedure byte coding
tpdu_gr = prev_tpdu[0:8] + sw[2:4]
data, sw = self.send_tpdu(tpdu_gr)
return data, sw
def __send_apdu_transparent(self, apdu: Hexstr) -> ResTuple:
# In cases where the TPDU format is the same as the APDU format, we may pass the given APDU through without modification
# (This is the case for T=1, see also ETSI TS 102 221, section 7.3.2.0.)
return self.send_tpdu(apdu)
def argparse_add_reader_args(arg_parser: argparse.ArgumentParser):
"""Add all reader related arguments to the given argparse.Argumentparser instance."""
from pySim.transport.serial import SerialSimLink