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BER-TLV EF support (command, filesystem, shell)

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This adds support for a new EF file type: BER-TLV files.  They are
different from transparent and linear fixed EFs in that they neither
operate on a byte stream nor fixed-sized records, but on BER-TLV encoded
objects.  One can specify a tag value, and the card will return the
entire TLV for that tag.

As indicated in the spec, the magic tag value 0x5C (92) will return a
list of tags existing in the file.

Change-Id: Ibfcce757dcd477fd0d6857f64fbb4346d6d62e63
This commit is contained in:
Harald Welte
2021-04-21 11:51:25 +02:00
parent fc4833ec20
commit 917d98c1a5
6 changed files with 301 additions and 7 deletions
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74
pySim/commands.py
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@@ -5,7 +5,7 @@
#
# Copyright (C) 2009-2010 Sylvain Munaut <tnt@246tNt.com>
# Copyright (C) 2010 Harald Welte <laforge@gnumonks.org>
# Copyright (C) 2010-2021 Harald Welte <laforge@gnumonks.org>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
@@ -23,7 +23,7 @@
from construct import *
from pySim.construct import LV
from pySim.utils import rpad, b2h, sw_match
from pySim.utils import rpad, b2h, h2b, sw_match, bertlv_encode_len
from pySim.exceptions import SwMatchError
class SimCardCommands(object):
@@ -269,6 +269,76 @@ class SimCardCommands(object):
r = self.select_path(ef)
return self.__len(r)
# TS 102 221 Section 11.3.1 low-level helper
def _retrieve_data(self, tag:int, first:bool=True):
if first:
pdu = '80cb008001%02x' % (tag)
else:
pdu = '80cb000000'
return self._tp.send_apdu_checksw(pdu)
# TS 102 221 Section 11.3.1
def retrieve_data(self, ef, tag:int):
"""Execute RETRIEVE DATA.
Args
ef : string or list of strings indicating name or path of transparent EF
tag : BER-TLV Tag of value to be retrieved
"""
r = self.select_path(ef)
if len(r[-1]) == 0:
return (None, None)
total_data = ''
# retrieve first block
data, sw = self._retrieve_data(tag, first=True)
total_data += data
while sw == '62f1' or sw == '62f2':
data, sw = self._retrieve_data(tag, first=False)
total_data += data
return total_data, sw
# TS 102 221 Section 11.3.2 low-level helper
def _set_data(self, data:str, first:bool=True):
if first:
p1 = 0x80
else:
p1 = 0x00
if isinstance(data, bytes) or isinstance(data, bytearray):
data = b2h(data)
pdu = '80db00%02x%02x%s' % (p1, len(data)//2, data)
return self._tp.send_apdu_checksw(pdu)
def set_data(self, ef, tag:int, value:str, verify:bool=False, conserve:bool=False):
"""Execute SET DATA.
Args
ef : string or list of strings indicating name or path of transparent EF
tag : BER-TLV Tag of value to be stored
value : BER-TLV value to be stored
"""
r = self.select_path(ef)
if len(r[-1]) == 0:
return (None, None)
# in case of deleting the data, we only have 'tag' but no 'value'
if not value:
return self._set_data('%02x' % tag, first=True)
# FIXME: proper BER-TLV encode
tl = '%02x%s' % (tag, b2h(bertlv_encode_len(len(value)//2)))
tlv = tl + value
tlv_bin = h2b(tlv)
first = True
total_len = len(tlv_bin)
remaining = tlv_bin
while len(remaining) > 0:
fragment = remaining[:255]
rdata, sw = self._set_data(fragment, first=first)
first = False
remaining = remaining[255:]
return rdata, sw
def run_gsm(self, rand:str):
"""Execute RUN GSM ALGORITHM."""
if len(rand) != 32: