Local fork of Henryk Ploetz' smardcard shell
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cyberflex-shell/utils.py

542 lines
20 KiB

import string, binascii, sys, re
def represent_binary_fancy(len, value, mask = 0):
result = []
for i in range(len):
if i%4 == 0:
result.append( " " )
if i%8 == 0:
result.append( " " )
if mask & 0x01:
result.append( str(value & 0x01) )
else:
result.append( "." )
mask = mask >> 1
value = value >> 1
result.reverse()
return "".join(result).strip()
def parse_binary(value, bytemasks, verbose = False, value_len = 8):
## Parses a binary structure and gives information back
## bytemasks is a sequence of (mask, value, string_if_no_match, string_if_match) tuples
result = []
for mask, byte, nonmatch, match in bytemasks:
if verbose:
prefix = represent_binary_fancy(value_len, value, mask) + ": "
else:
prefix = ""
if (value & mask) == (byte & mask):
if match is not None:
result.append(prefix + match)
else:
if nonmatch is not None:
result.append(prefix + nonmatch)
return result
_myprintable = " " + string.letters + string.digits + string.punctuation
def hexdump(data, indent = 0, short = False, linelen = 16, offset = 0):
r"""Generates a nice hexdump of data and returns it. Consecutive lines will
be indented with indent spaces. When short is true, will instead generate
hexdump without adresses and on one line.
Examples:
hexdump('\x00\x41') -> \
'0000: 00 41 .A '
hexdump('\x00\x41', short=True) -> '00 41 (.A)'"""
def hexable(data):
return " ".join([binascii.b2a_hex(a) for a in data])
def printable(data):
return "".join([e in _myprintable and e or "." for e in data])
if short:
return "%s (%s)" % (hexable(data), printable(data))
FORMATSTRING = "%04x: %-"+ str(linelen*3) +"s %-"+ str(linelen) +"s"
result = ""
(head, tail) = (data[:linelen], data[linelen:])
pos = 0
while len(head) > 0:
if pos > 0:
result = result + "\n%s" % (' ' * indent)
result = result + FORMATSTRING % (pos+offset, hexable(head), printable(head))
pos = pos + len(head)
(head, tail) = (tail[:linelen], tail[linelen:])
return result
LIFE_CYCLES = {0x01: "Load file = loaded",
0x03: "Applet instance / security domain = Installed",
0x07: "Card manager = Initialized; Applet instance / security domain = Selectable",
0x0F: "Card manager = Secured; Applet instance / security domain = Personalized",
0x7F: "Card manager = Locked; Applet instance / security domain = Blocked",
0xFF: "Applet instance = Locked"}
def parse_status(data):
"""Parses the Response APDU of a GetStatus command."""
def parse_segment(segment):
def parse_privileges(privileges):
if privileges == 0x0:
return "N/A"
else:
privs = []
if privileges & (1<<7):
privs.append("security domain")
if privileges & (1<<6):
privs.append("DAP DES verification")
if privileges & (1<<5):
privs.append("delegated management")
if privileges & (1<<4):
privs.append("card locking")
if privileges & (1<<3):
privs.append("card termination")
if privileges & (1<<2):
privs.append("default selected")
if privileges & (1<<1):
privs.append("global PIN modification")
if privileges & (1<<0):
privs.append("mandated DAP verification")
return ", ".join(privs)
lgth = ord(segment[0])
aid = segment[1:1+lgth]
lifecycle = ord(segment[1+lgth])
privileges = ord(segment[1+lgth+1])
print "aid length: %i (%x)" % (lgth, lgth)
print "aid: %s" % hexdump(aid, indent = 18, short=True)
print "life cycle state: %x (%s)" % (lifecycle, LIFE_CYCLES.get(lifecycle, "unknown or invalid state"))
print "privileges: %x (%s)\n" % (privileges, parse_privileges(privileges))
pos = 0
while pos < len(data):
lgth = ord(data[pos])+3
segment = data[pos:pos+lgth]
parse_segment(segment)
pos = pos + lgth
def _unformat_hexdump(dump):
hexdump = " ".join([line[7:54] for line in dump.splitlines()])
return binascii.a2b_hex("".join([e != " " and e or "" for e in hexdump]))
def _make_byte_property(prop):
"Make a byte property(). This is meta code."
return property(lambda self: getattr(self, "_"+prop, 0),
lambda self, value: self._setbyte(prop, value),
lambda self: delattr(self, "_"+prop),
"The %s attribute of the APDU" % prop)
class APDU(object):
"Base class for an APDU"
def __init__(self, *args, **kwargs):
"""Creates a new APDU instance. Can be given positional parameters which
must be sequences of either strings (or strings themselves) or integers
specifying byte values that will be concatenated in order. Alternatively
you may give exactly one positional argument that is an APDU instance.
After all the positional arguments have been concatenated they must
form a valid APDU!
The keyword arguments can then be used to override those values.
Keywords recognized are:
C_APDU: cla, ins, p1, p2, lc, le, data
R_APDU: sw, sw1, sw2, data
"""
initbuff = list()
if len(args) == 1 and isinstance(args[0], self.__class__):
self.parse( args[0].render() )
else:
for arg in args:
if type(arg) == str:
initbuff.extend(arg)
elif hasattr(arg, "__iter__"):
for elem in arg:
if hasattr(elem, "__iter__"):
initbuff.extend(elem)
else:
initbuff.append(elem)
else:
initbuff.append(arg)
for (index, value) in enumerate(initbuff):
t = type(value)
if t == str:
initbuff[index] = ord(value)
elif t != int:
raise TypeError, "APDU must consist of ints or one-byte strings, not %s (index %s)" % (t, index)
self.parse( initbuff )
for (name, value) in kwargs.items():
if value is not None:
setattr(self, name, value)
def _getdata(self):
return self._data
def _setdata(self, value):
if isinstance(value, str):
self._data = "".join([e for e in value])
elif isinstance(value, list):
self._data = "".join([chr(int(e)) for e in value])
else:
raise ValueError, "'data' attribute can only be a str or a list of int, not %s" % type(value)
self.Lc = len(value)
def _deldata(self):
del self._data; self.data = ""
data = property(_getdata, _setdata, None,
"The data contents of this APDU")
def _setbyte(self, name, value):
#print "setbyte(%r, %r)" % (name, value)
if isinstance(value, int):
setattr(self, "_"+name, value)
elif isinstance(value, str):
setattr(self, "_"+name, ord(value))
else:
raise ValueError, "'%s' attribute can only be a byte, that is: int or str, not %s" % (namelower, type(value))
def _format_parts(self, fields):
"utility function to be used in __str__ and __repr__"
parts = []
for i in fields:
parts.append( "%s=0x%02X" % (i, getattr(self, i)) )
return parts
def __str__(self):
result = "%s(%s)" % (self.__class__.__name__, ", ".join(self._format_fields()))
if len(self.data) > 0:
result = result + " with %i (0x%02x) bytes of data" % (
len(self.data), len(self.data)
)
return result + ":\n" + hexdump(self.data)
else:
return result
def __repr__(self):
parts = self._format_fields()
if len(self.data) > 0:
parts.append("data=%r" % self.data)
return "%s(%s)" % (self.__class__.__name__, ", ".join(parts))
class C_APDU(APDU):
"Class for a command APDU"
def parse(self, apdu):
"Parse a full command APDU and assign the values to our object, overwriting whatever there was."
apdu = map( lambda a: (isinstance(a, str) and (ord(a),) or (a,))[0], apdu)
apdu = apdu + [0] * max(4-len(apdu), 0)
self.CLA, self.INS, self.P1, self.P2 = apdu[:4] # case 1, 2, 3, 4
if len(apdu) == 5: # case 2
self.Le = apdu[-1]
self.data = ""
elif len(apdu) > 5: # case 3, 4
self.Lc = apdu[4]
if len(apdu) == 5 + self.Lc: # case 3
self.data = apdu[5:]
elif len(apdu) == 5 + self.Lc + 1: # case 4
self.data = apdu[5:-1]
self.Le = apdu[-1]
else:
raise ValueError, "Invalid Lc value. Is %s, should be %s or %s" % (self.Lc,
5 + self.Lc, 5 + self.Lc + 1)
else: # case 1
self.data = ""
CLA = _make_byte_property("CLA"); cla = CLA
INS = _make_byte_property("INS"); ins = INS
P1 = _make_byte_property("P1"); p1 = P1
P2 = _make_byte_property("P2"); p2 = P2
Lc = _make_byte_property("Lc"); lc = Lc
Le = _make_byte_property("Le"); le = Le
def _format_fields(self):
fields = ["CLA", "INS", "P1", "P2"]
if self.Lc > 0:
fields.append("Lc")
if hasattr(self, "_Le"): ## There's a difference between "Le = 0" and "no Le"
fields.append("Le")
return self._format_parts(fields)
def render(self):
"Return this APDU as a binary string"
buffer = []
for i in self.CLA, self.INS, self.P1, self.P2:
buffer.append(chr(i))
if len(self.data) > 0:
buffer.append(chr(self.Lc))
buffer.append(self.data)
if hasattr(self, "_Le"):
buffer.append(chr(self.Le))
return "".join(buffer)
def case(self):
"Return 1, 2, 3 or 4, depending on which ISO case we represent."
if self.Lc == 0:
if not hasattr(self, "_Le"):
return 1
else:
return 2
else:
if not hasattr(self, "_Le"):
return 3
else:
return 4
_apduregex = re.compile(r'^\s*([0-9a-f]{2}\s*){4,}$', re.I)
_fancyapduregex = re.compile(r'^\s*([0-9a-f]{2}\s*){4,}\s*((xx|yy)\s*)?(([0-9a-f]{2}|:|\)|\(|\[|\])\s*)*$', re.I)
@staticmethod
def parse_fancy_apdu(*args):
apdu_string = " ".join(args)
if not C_APDU._fancyapduregex.match(apdu_string):
raise ValueError
apdu_string = apdu_string.lower()
have_le = False
pos = apdu_string.find("xx")
if pos == -1:
pos = apdu_string.find("yy")
have_le = True
apdu_head = ""
apdu_tail = apdu_string
if pos != -1:
apdu_head = apdu_string[:pos]
apdu_tail = apdu_string[pos+2:]
if apdu_head.strip() != "" and not C_APDU._apduregex.match(apdu_head):
raise ValueError
class Node(list):
def __init__(self, parent = None, type = None):
list.__init__(self)
self.parent = parent
self.type = type
def make_binary(self):
"Recursively transform hex strings to binary"
for index, child in enumerate(self):
if isinstance(child,str):
child = "".join( ("".join(child.split())).split(":") )
assert len(child) % 2 == 0
self[index] = binascii.a2b_hex(child)
else:
child.make_binary()
def calculate_lengths(self):
"Recursively calculate lengths and insert length counts"
self.length = 0
index = 0
while index < len(self): ## Can't use enumerate() due to the insert() below
child = self[index]
if isinstance(child,str):
self.length = self.length + len(child)
else:
child.calculate_lengths()
formatted_len = binascii.a2b_hex("%02x" % child.length) ## FIXME len > 255?
self.length = self.length + len(formatted_len) + child.length
self.insert(index, formatted_len)
index = index + 1
index = index + 1
def flatten(self, offset = 0, ignore_types=["("]):
"Recursively flatten, gather list of marks"
string_result = []
mark_result = []
for child in self:
if isinstance(child,str):
string_result.append(child)
offset = offset + len(child)
else:
start = offset
child_string, child_mark = child.flatten(offset, ignore_types)
string_result.append(child_string)
offset = end = offset + len(child_string)
if not child.type in ignore_types:
mark_result.append( (child.type, start, end) )
mark_result.extend(child_mark)
return "".join(string_result), mark_result
tree = Node()
current = tree
allowed_parens = {"(": ")", "[":"]"}
for pos,char in enumerate(apdu_tail):
if char in (" ", "a", "b", "c", "d", "e", "f",":") or char.isdigit():
if len(current) > 0 and isinstance(current[-1],str):
current[-1] = current[-1] + char
else:
current.append(str(char))
elif char in allowed_parens.values():
if current.parent is None:
raise ValueError
if allowed_parens[current.type] != char:
raise ValueError
current = current.parent
elif char in allowed_parens.keys():
current.append( Node(current, char) )
current = current[-1]
else:
raise ValueError
if current != tree:
raise ValueError
tree.make_binary()
tree.calculate_lengths()
apdu_head = apdu_head.strip()
if apdu_head != "":
l = tree.length
if have_le:
l = l - 1 ## FIXME Le > 255?
formatted_len = "%02x" % l ## FIXME len > 255?
apdu_head = binascii.a2b_hex("".join( (apdu_head + formatted_len).split() ))
apdu_tail, marks = tree.flatten(offset=0)
apdu = C_APDU(apdu_head + apdu_tail, marks = marks)
return apdu
class R_APDU(APDU):
"Class for a response APDU"
def _getsw(self): return chr(self.SW1) + chr(self.SW2)
def _setsw(self, value):
if len(value) != 2:
raise ValueError, "SW must be exactly two bytes"
self.SW1 = value[0]
self.SW2 = value[1]
SW = property(_getsw, _setsw, None,
"The Status Word of this response APDU")
sw = SW
SW1 = _make_byte_property("SW1"); sw1 = SW1
SW2 = _make_byte_property("SW2"); sw2 = SW2
def parse(self, apdu):
"Parse a full response APDU and assign the values to our object, overwriting whatever there was."
self.SW = apdu[-2:]
self.data = apdu[:-2]
def _format_fields(self):
fields = ["SW1", "SW2"]
return self._format_parts(fields)
def render(self):
"Return this APDU as a binary string"
return self.data + self.sw
if __name__ == "__main__":
response = """
0000: 07 A0 00 00 00 03 00 00 07 00 07 A0 00 00 00 62 ...............b
0010: 00 01 01 00 07 A0 00 00 00 62 01 01 01 00 07 A0 .........b......
0020: 00 00 00 62 01 02 01 00 07 A0 00 00 00 62 02 01 ...b.........b..
0030: 01 00 07 A0 00 00 00 03 00 00 01 00 0E A0 00 00 ................
0040: 00 30 00 00 90 07 81 32 10 00 00 01 00 0E A0 00 .0.....2........
0050: 00 00 30 00 00 90 07 81 42 10 00 00 01 00 0E A0 ..0.....B.......
0060: 00 00 00 30 00 00 90 07 81 41 10 00 00 07 00 0E ...0.....A......
0070: A0 00 00 00 30 00 00 90 07 81 12 10 00 00 01 00 ....0...........
0080: 09 53 4C 42 43 52 59 50 54 4F 07 00 90 00 .SLBCRYPTO....
""" # 64kv1 vorher
response = """
0000: 07 A0 00 00 00 03 00 00 0F 00 07 A0 00 00 00 62 ...............b
0010: 00 01 01 00 07 A0 00 00 00 62 01 01 01 00 07 A0 .........b......
0020: 00 00 00 62 01 02 01 00 07 A0 00 00 00 62 02 01 ...b.........b..
0030: 01 00 07 A0 00 00 00 03 00 00 01 00 08 A0 00 00 ................
0040: 00 30 00 CA 10 01 00 0E A0 00 00 00 30 00 00 90 .0..........0...
0050: 07 81 32 10 00 00 01 00 0E A0 00 00 00 30 00 00 ..2..........0..
0060: 90 07 81 42 10 00 00 01 00 0E A0 00 00 00 30 00 ...B..........0.
0070: 00 90 07 81 41 10 00 00 07 00 0E A0 00 00 00 30 ....A..........0
0080: 00 00 90 07 81 12 10 00 00 01 00 09 53 4C 42 43 ............SLBC
0090: 52 59 50 54 4F 07 00 90 00 RYPTO....
""" # komische Karte
response = """
0000: 07 A0 00 00 00 03 00 00 07 00 07 A0 00 00 00 62 ...............b
0010: 00 01 01 00 07 A0 00 00 00 62 01 01 01 00 07 A0 .........b......
0020: 00 00 00 62 01 02 01 00 07 A0 00 00 00 62 02 01 ...b.........b..
0030: 01 00 07 A0 00 00 00 03 00 00 01 00 0E A0 00 00 ................
0040: 00 30 00 00 90 07 81 32 10 00 00 01 00 0E A0 00 .0.....2........
0050: 00 00 30 00 00 90 07 81 42 10 00 00 01 00 0E A0 ..0.....B.......
0060: 00 00 00 30 00 00 90 07 81 41 10 00 00 07 00 0E ...0.....A......
0070: A0 00 00 00 30 00 00 90 07 81 12 10 00 00 01 00 ....0...........
0080: 09 53 4C 42 43 52 59 50 54 4F 07 00 05 A0 00 00 .SLBCRYPTO......
0090: 00 01 01 00 90 00 ......
""" # 64kv1 nachher
response = """
0000: 07 A0 00 00 00 03 00 00 07 00 07 A0 00 00 00 62 ...............b
0010: 00 01 01 00 07 A0 00 00 00 62 01 01 01 00 07 A0 .........b......
0020: 00 00 00 62 01 02 01 00 07 A0 00 00 00 62 02 01 ...b.........b..
0030: 01 00 07 A0 00 00 00 03 00 00 01 00 0E A0 00 00 ................
0040: 00 30 00 00 90 07 81 32 10 00 00 01 00 0E A0 00 .0.....2........
0050: 00 00 30 00 00 90 07 81 42 10 00 00 01 00 0E A0 ..0.....B.......
0060: 00 00 00 30 00 00 90 07 81 41 10 00 00 07 00 0E ...0.....A......
0070: A0 00 00 00 30 00 00 90 07 81 12 10 00 00 01 00 ....0...........
0080: 09 53 4C 42 43 52 59 50 54 4F 07 00 05 A0 00 00 .SLBCRYPTO......
0090: 00 01 01 00 06 A0 00 00 00 01 01 07 02 90 00 ...............
""" # 64k1 nach setup
#response = sys.stdin.read()
#parse_status(_unformat_hexdump(response)[:-2])
a = C_APDU(1,2,3,4) # case 1
b = C_APDU(1,2,3,4,5) # case 2
c = C_APDU((1,2,3), cla=0x23, data="hallo") # case 3
d = C_APDU(1,2,3,4,2,4,6,0) # case 4
print
print a
print b
print c
print d
print
print repr(a)
print repr(b)
print repr(c)
print repr(d)
print
for i in a, b, c, d:
print hexdump(i.render())
print
e = R_APDU(0x90,0)
f = R_APDU("foo\x67\x00")
print
print e
print f
print
print repr(e)
print repr(f)
print
for i in e, f:
print hexdump(i.render())