1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
|
from generic_application import Application
import struct, sha, binascii
from utils import hexdump, C_APDU
import crypto_utils
class Passport_Application(Application):
DRIVER_NAME = "Passport"
APDU_GET_RANDOM = C_APDU(CLA=0, INS=0x84, Le=0x08)
APDU_MUTUAL_AUTHENTICATE = C_APDU(CLA=0, INS=0x82, Le=0x28)
SW_OK = "\x90\x00"
AID_LIST = [
"a0000002471001"
]
def __init__(self, *args, **kwargs):
self.ssc = None
self.KSenc = None
self.KSmac = None
def derive_key(Kseed, c):
"""Derive a key according to TR-PKI mrtds ICC read-only access v1.1 annex E.1.
c is either 1 for encryption or 2 for MAC computation.
Returns: Ka + Kb
Note: Does not adjust parity. Nobody uses that anyway ..."""
D = Kseed + struct.pack(">i", c)
H = sha.sha(D).digest()
Ka = H[0:8]
Kb = H[8:16]
return Ka + Kb
derive_key = staticmethod(derive_key)
def derive_seed(mrz2, verbose=0):
"""Derive Kseed from the second line of the MRZ according to TR-PKI mrtds ICC read-only access v1.1 annex F.1.1"""
if verbose:
print "MRZ_information: '%s' + '%s' + '%s'" % (mrz2[0:10], mrz2[13:20], mrz2[21:28])
MRZ_information = mrz2[0:10] + mrz2[13:20] + mrz2[21:28]
H = sha.sha(MRZ_information).digest()
Kseed = H[:16]
print "SHA1('%s')[:16] =\nKseed = %s" % (MRZ_information, hexdump(Kseed))
return Kseed
derive_seed = staticmethod(derive_seed)
def cmd_perform_bac(self, mrz2, verbose=1):
"Perform the Basic Acess Control authentication and establishment of session keys"
Kseed = self.derive_seed(mrz2, verbose)
Kenc = self.derive_key(Kseed, 1)
Kmac = self.derive_key(Kseed, 2)
if verbose:
print "Kenc = %s" % hexdump(Kenc)
print "Kmac = %s" % hexdump(Kmac)
print
result = self.send_apdu(self.APDU_GET_RANDOM)
assert result.sw == self.SW_OK
rnd_icc = result.data
if verbose:
print "RND.icc = %s" % hexdump(rnd_icc)
rndtmp = self._make_random(8 + 16)
rnd_ifd = rndtmp[:8]
Kifd = rndtmp[8:]
if verbose:
print "RND.ifd = %s" % hexdump(rnd_ifd)
print "Kifd = %s" % hexdump(Kifd, indent=10)
S = rnd_ifd + rnd_icc + Kifd
Eifd = crypto_utils.cipher(True, "des3-cbc", Kenc, S)
Mifd = self._mac(Kmac, Eifd)
if verbose:
print "Eifd = %s" % hexdump(Eifd, indent=10)
print "Mifd = %s" % hexdump(Mifd)
print
auth_apdu = C_APDU(self.APDU_MUTUAL_AUTHENTICATE, data = Eifd + Mifd)
result = self.send_apdu(auth_apdu)
assert result.sw == self.SW_OK
resp_data = result.data
Eicc = resp_data[:-8]
Micc = self._mac(Kmac, Eicc)
if not Micc == resp_data[-8:]:
raise ValueError, "Passport authentication failed: Wrong MAC on incoming data during Mutual Authenticate"
if verbose:
print "Eicc = %s" % hexdump(Eicc, indent=10)
print "Micc = %s" % hexdump(Micc)
print "Micc verified OK"
R = crypto_utils.cipher(False, "des3-cbc", Kenc, Eicc)
if verbose:
print "R = %s" % hexdump(R, indent=10)
if not R[:8] == rnd_icc:
raise ValueError, "Passport authentication failed: Wrong RND.icc on incoming data during Mutual Authenticate"
if not R[8:16] == rnd_ifd:
raise ValueError, "Passport authentication failed: Wrong RND.ifd on incoming data during Mutual Authenticate"
Kicc = R[16:]
if verbose:
print "Kicc = %s" % hexdump(Kicc)
print
KSseed = crypto_utils.operation_on_string(Kicc, Kifd, lambda a,b: a^b)
self.KSenc = self.derive_key(KSseed, 1)
self.KSmac = self.derive_key(KSseed, 2)
self.ssc = rnd_icc[-4:] + rnd_ifd[-4:]
if verbose:
print "KSseed = %s" % hexdump(KSseed)
print "KSenc = %s" % hexdump(self.KSenc)
print "KSmac = %s" % hexdump(self.KSmac)
print "ssc = %s" % hexdump(self.ssc)
def _mac(key, data, ssc = None):
if ssc:
data = ssc + data
topad = 8 - len(data) % 8
data = data + "\x80" + ("\x00" * (topad-1))
a = crypto_utils.cipher(True, "des-cbc", key[:8], data)
b = crypto_utils.cipher(False, "des-ecb", key[8:16], a[-8:])
c = crypto_utils.cipher(True, "des-ecb", key[:8], b)
return c
_mac = staticmethod(_mac)
def _make_random(len):
"Get len random bytes from /dev/urandom"
urand = file("/dev/urandom","r")
try:
r = urand.read(len)
finally:
urand.close()
return r
_make_random = staticmethod(_make_random)
COMMANDS = {
"perform_bac": cmd_perform_bac,
}
if __name__ == "__main__":
mrz1 = "P<UTOERIKSSON<<ANNA<MARIA<<<<<<<<<<<<<<<<<<<"
mrz2 = "L898902C<3UTO6908061F9406236ZE184226B<<<<<14"
seed = Passport_Application.derive_seed(mrz2)
assert seed == binascii.a2b_hex("239AB9CB282DAF66231DC5A4DF6BFBAE")
k = Passport_Application.derive_key(seed, 1)
print hexdump(k)
print "----------------------------------------------------"
sniff_mrz2 = "S1234567D5SGP6001010M0512310<<<<<<<<<<<<<<02"
sniffed_Eifd = binascii.a2b_hex("".join("f7 62 81 a3 eb 7c 87 eb 6d 89 1e ec d2 8d 43 7d bf ab a0 bc 20 20 fd c4 3a 76 2a b6 ff 0c f5 61".split()))
sniffed_Mifd = binascii.a2b_hex("".join("e1 34 04 96 3e 1c ba c8".split()))
seed = Passport_Application.derive_seed(sniff_mrz2)
k = Passport_Application.derive_key(seed, 2)
print hexdump(Passport_Application._mac(k, sniffed_Eifd))
print hexdump(sniffed_Mifd)
|
