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commands.py: Wrap the transport send_apdu* methods

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Let's not have higher level code directly call the transports send_apdu*
methods.  We do this as a precursor to introducing secure channel
support, where the secure channel driver would add MAC and/or encrypt
APDUs before they are sent to the transport.

Change-Id: I1b870140959aa8241cda2246e74576390123cb2d
This commit is contained in:
Harald Welte
2024-01-31 19:32:25 +01:00
parent 5918345c78
commit eecef54eee
6 changed files with 121 additions and 104 deletions
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51
pySim/transport/__init__.py
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@@ -10,7 +10,6 @@ from typing import Optional, Tuple
from construct import Construct
from pySim.exceptions import *
from pySim.construct import filter_dict
from pySim.utils import sw_match, b2h, h2b, i2h, Hexstr, SwHexstr, SwMatchstr, ResTuple
from pySim.cat import ProactiveCommand, CommandDetails, DeviceIdentities, Result
@@ -219,56 +218,6 @@ class LinkBase(abc.ABC):
raise SwMatchError(rv[1], sw.lower(), self.sw_interpreter)
return rv
def send_apdu_constr(self, cla: Hexstr, ins: Hexstr, p1: Hexstr, p2: Hexstr, cmd_constr: Construct,
cmd_data: Hexstr, resp_constr: Construct) -> Tuple[dict, SwHexstr]:
"""Build and sends an APDU using a 'construct' definition; parses response.
Args:
cla : string (in hex) ISO 7816 class byte
ins : string (in hex) ISO 7816 instruction byte
p1 : string (in hex) ISO 7116 Parameter 1 byte
p2 : string (in hex) ISO 7116 Parameter 2 byte
cmd_cosntr : defining how to generate binary APDU command data
cmd_data : command data passed to cmd_constr
resp_cosntr : defining how to decode binary APDU response data
Returns:
Tuple of (decoded_data, sw)
"""
cmd = cmd_constr.build(cmd_data) if cmd_data else ''
p3 = i2h([len(cmd)])
pdu = ''.join([cla, ins, p1, p2, p3, b2h(cmd)])
(data, sw) = self.send_apdu(pdu)
if data:
# filter the resulting dict to avoid '_io' members inside
rsp = filter_dict(resp_constr.parse(h2b(data)))
else:
rsp = None
return (rsp, sw)
def send_apdu_constr_checksw(self, cla: Hexstr, ins: Hexstr, p1: Hexstr, p2: Hexstr,
cmd_constr: Construct, cmd_data: Hexstr, resp_constr: Construct,
sw_exp: SwMatchstr="9000") -> Tuple[dict, SwHexstr]:
"""Build and sends an APDU using a 'construct' definition; parses response.
Args:
cla : string (in hex) ISO 7816 class byte
ins : string (in hex) ISO 7816 instruction byte
p1 : string (in hex) ISO 7116 Parameter 1 byte
p2 : string (in hex) ISO 7116 Parameter 2 byte
cmd_cosntr : defining how to generate binary APDU command data
cmd_data : command data passed to cmd_constr
resp_cosntr : defining how to decode binary APDU response data
exp_sw : string (in hex) of status word (ex. "9000")
Returns:
Tuple of (decoded_data, sw)
"""
(rsp, sw) = self.send_apdu_constr(cla, ins,
p1, p2, cmd_constr, cmd_data, resp_constr)
if not sw_match(sw, sw_exp):
raise SwMatchError(sw, sw_exp.lower(), self.sw_interpreter)
return (rsp, sw)
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