def testBadSpec(self):
try:
decoder.decode('', asn1Spec='not an Asn1Item')
except PyAsn1Error:
pass
else:
assert 0, 'Invalid asn1Spec accepted'
def testBadSpec(self):
try:
decoder.decode('', asn1Spec='not an Asn1Item')
except PyAsn1Error:
pass
else:
assert 0, 'Invalid asn1Spec accepted'
def getDevicePSKData(mode, psk, nonce, digest, payload_key):
crypto_mode = cryptoMode(mode)
LOG.debug('Creating PSK data: ')
LOG.debug(' mode: {}'.format(crypto_mode.name))
LOG.debug(' iv ({0} bytes): {1}'.format(len(nonce),
binascii.b2a_hex(nonce)))
LOG.debug(' md ({0} bytes): {1}'.format(len(digest),
binascii.b2a_hex(digest)))
data = {'hash': digest}
if payload_key:
data['cek'] = payload_key
asnData = native_decoder.decode(
data, asn1Spec=manifest_definition.KeyTableEntry())
plainText = der_encoder.encode(asnData)
LOG.debug('PSK plaintext ({0} bytes): {1}'.format(
len(plainText), binascii.b2a_hex(plainText)))
pskSig = {
'none-psk-aes-128-ccm-sha256':
lambda key, iv, d: AESCCM(key[:128 // 8]).encrypt(iv, d, b''),
'psk-aes-128-ccm-sha256':
lambda key, iv, d: AESCCM(key[:128 // 8]).encrypt(iv, d, b'')
}.get(crypto_mode.name, lambda a, b, d: None)(psk, nonce, plainText)
LOG.debug('PSK data ({0} bytes): {1}'.format(len(pskSig),
binascii.b2a_hex(pskSig)))
return pskSig
def testSimple(self):
s = self.s.clone()
s[0] = univ.Null('')
s[1] = univ.OctetString('xx')
s[2] = univ.Integer(33)
assert decoder.decode(
{
'place-holder': None,
'first-name': 'xx',
'age': 33
},
asn1Spec=self.s) == s
def testSimple(self):
assert decoder.decode(1.33, asn1Spec=univ.Real()) == univ.Real(1.33)
def testNull(self):
assert decoder.decode(None, asn1Spec=univ.Null()) == univ.Null()
def testSimple(self):
assert decoder.decode('11111111', asn1Spec=univ.BitString()) == univ.BitString(hexValue='ff')
def testTrue(self):
assert decoder.decode(True, asn1Spec=univ.Boolean()) == univ.Boolean(True)
def testPosInt(self):
assert decoder.decode(12, asn1Spec=univ.Integer()) == univ.Integer(12)
def testSimple(self):
assert decoder.decode('fox', asn1Spec=univ.Any()) == univ.Any('fox')
def profile_kdc(builder,
ca_nick,
ca,
warp=datetime.timedelta(days=0),
dns_name=None,
badusage=False):
now = datetime.datetime.utcnow() + warp
builder = builder.not_valid_before(now)
builder = builder.not_valid_after(now + YEAR)
crl_uri = u'file://{}.crl'.format(os.path.join(cert_dir, ca_nick))
builder = builder.add_extension(
x509.ExtendedKeyUsage([x509.ObjectIdentifier('1.3.6.1.5.2.3.5')]),
critical=False,
)
name = {
'realm': realm,
'principalName': {
'name-type': 2,
'name-string': ['krbtgt', realm],
},
}
name = native_decoder.decode(name, asn1Spec=KRB5PrincipalName())
name = der_encoder.encode(name)
names = [x509.OtherName(x509.ObjectIdentifier('1.3.6.1.5.2.2'), name)]
if dns_name is not None:
names += [x509.DNSName(dns_name)]
builder = builder.add_extension(
x509.SubjectAlternativeName(names),
critical=False,
)
builder = builder.add_extension(
x509.CRLDistributionPoints([
x509.DistributionPoint(
full_name=[x509.UniformResourceIdentifier(crl_uri)],
relative_name=None,
crl_issuer=None,
reasons=None,
),
]),
critical=False,
)
if badusage:
builder = builder.add_extension(x509.KeyUsage(digital_signature=False,
content_commitment=False,
key_encipherment=False,
data_encipherment=True,
key_agreement=True,
key_cert_sign=False,
crl_sign=False,
encipher_only=False,
decipher_only=False),
critical=False)
return builder
def testPosInt(self):
assert decoder.decode(12, asn1Spec=univ.Integer()) == univ.Integer(12)
def testSimple(self):
assert decoder.decode('fox', asn1Spec=univ.Any()) == univ.Any('fox')
def testSimple(self):
s = self.s.clone()
s[1] = univ.OctetString('xx')
assert decoder.decode({'first-name': 'xx'}, asn1Spec=self.s) == s
def profile_kdc(builder, ca_nick, ca,
warp=datetime.timedelta(days=0), dns_name=None,
badusage=False):
now = datetime.datetime.utcnow() + warp
builder = builder.not_valid_before(now)
builder = builder.not_valid_after(now + YEAR)
crl_uri = u'file://{}.crl'.format(os.path.join(cert_dir, ca_nick))
builder = builder.add_extension(
x509.ExtendedKeyUsage([x509.ObjectIdentifier('1.3.6.1.5.2.3.5')]),
critical=False,
)
name = {
'realm': realm,
'principalName': {
'name-type': 2,
'name-string': ['krbtgt', realm],
},
}
name = native_decoder.decode(name, asn1Spec=KRB5PrincipalName())
name = der_encoder.encode(name)
names = [x509.OtherName(x509.ObjectIdentifier('1.3.6.1.5.2.2'), name)]
if dns_name is not None:
names += [x509.DNSName(dns_name)]
builder = builder.add_extension(
x509.SubjectAlternativeName(names),
critical=False,
)
builder = builder.add_extension(
x509.CRLDistributionPoints([
x509.DistributionPoint(
full_name=[x509.UniformResourceIdentifier(crl_uri)],
relative_name=None,
crl_issuer=None,
reasons=None,
),
]),
critical=False,
)
if badusage:
builder = builder.add_extension(
x509.KeyUsage(
digital_signature=False,
content_commitment=False,
key_encipherment=False,
data_encipherment=True,
key_agreement=True,
key_cert_sign=False,
crl_sign=False,
encipher_only=False,
decipher_only=False
),
critical=False
)
return builder
def SHA_1_Scenario(n, e, d, data):
# make digest
md = hashlib.sha1()
md.update(data)
md = md.digest()
# to asn1
public_key = decode({'n': n, 'e': e}, asn1Spec=RsaKey())
der_public_key = der_encode(public_key)
# send public key
with open('public_key', 'wb') as key_file:
key_file.write(der_public_key)
# recieve public key
with open('public_key', 'rb') as key_file:
public_key = key_file.read()
# from asn1 get e,n
public_key, _ = der_decode(public_key, asn1Spec=RsaKey())
public_key = encode(public_key)
e = public_key['e']
n = public_key['n']
#encrypt hash with RSA
hash_as_number = int.from_bytes(md, 'big')
rsa_ecnrypted_hash = RSA_encrypt(n, d, hash_as_number)
# to asn1
file_with_hash = decode(
{
'alg_id': b'0006',
'key_id': b'key_for_sha',
'n': n,
'e': e,
'c': rsa_ecnrypted_hash
},
asn1Spec=RsaFile())
der_file_with_hash = der_encode(file_with_hash)
# send encrypted 3DES's key
with open('file_with_hash', 'wb') as file:
file.write(der_file_with_hash)
# recieve encrypted 3DES's key
with open('file_with_hash', 'rb') as file:
encrypted_hash = file.read()
# from asn1 get c
encrypted_hash, _ = der_decode(encrypted_hash, asn1Spec=RsaFile())
encrypted_hash = encode(encrypted_hash)
c = encrypted_hash['c']
# rsa decrypt
hash = RSA_decrypt(n, e, c)
hash = hash.to_bytes((hash.bit_length() + 7) // 8, 'big')
# send file
copyfile("data", "accepted_data")
input("Continue?\n")
# compare hashes
path = "accepted_data"
file = open(path, "rb")
data = file.read()
file.close()
md = hashlib.sha1()
md.update(data)
md = md.digest()
if (hash == md):
print('Hashes matches\n')
else:
print('File corrupted\n')
def main():
parser = argparse.ArgumentParser(
description='Prepare a device identity blob for a Toluene device')
parser.add_argument('-v',
'--verbose',
help='verbose output',
action='store_true')
parser.add_argument('-E',
'--wifi-essid',
help='access point ESSID',
required=True,
dest='essid')
parser.add_argument('-u',
'--wifi-username',
help='username for WPA authentication',
required=False,
default='username')
parser.add_argument('-P',
'--wifi-password',
help='access point password',
required=True,
dest='password')
parser.add_argument('-a',
'--wifi-auth',
help='wifi authentication scheme to use',
default='psk')
parser.add_argument('-A',
'--wifi-cert',
help='wifi certificate authority',
default='',
type=str)
parser.add_argument('-H',
'--service-host',
help='host name for the service host',
required=True,
dest='host')
parser.add_argument('-p',
'--service-port',
help='service port number to connect to',
required=True,
dest='port')
parser.add_argument('-I',
'--device-id',
help='device identifier used during submission',
required=True,
type=lambda x: int(x, 0))
parser.add_argument('-K',
'--private-key',
help='private key file name',
required=True,
dest='private_key')
parser.add_argument('-o',
'--output-file',
help='output file',
dest='out_file',
default='')
parser.add_argument('-U',
'--uart',
help='UART to write the identity blob out to',
dest='uart',
default='',
required=True)
parser.add_argument('-B',
'--baud',
help='The baud rate',
dest='baud_rate',
default=115200)
parser.add_argument(
'-S',
'--server-ca',
help='The trusted server CA (a DER-encoded certificate)',
dest='server_ca',
required=True)
parser.add_argument('-C',
'--ca-signing-key',
help='The CA signing private key',
required=True)
parser.add_argument(
'-c',
'--ca-chain',
help=
'The certificate chain that attests the CA signing key (as a PEM file)',
required=True)
parser.add_argument(
'-L',
'--valid-length',
help=
'The length of time (in days) the certificate is valid for, starting from this moment',
required=False,
default=1024,
type=int)
args = parser.parse_args()
# Set verbosity, globally.
if args.verbose:
log_level = logging.DEBUG
else:
log_level = logging.INFO
logging.basicConfig(
format='%(asctime)s - %(name)s:%(levelname)s:%(message)s',
datefmt='%m/%d/%Y %H:%M:%S',
level=log_level)
if not args.uart:
raise Exception(
'Need to specify a valid UART to connect to for provisioning')
if args.wifi_auth not in ['psk', 'peap', 'open']:
raise Exception('Unknown wifi auth type: {}'.format(args.wifi_auth))
logging.info('Loading key from file {}'.format(args.private_key))
# Read in the key
with open(args.private_key, 'rb') as fp:
raw_key = fp.read()
pk = load_pem_private_key(raw_key,
password=None,
backend=default_backend())
with open(args.server_ca, 'rb') as fp:
server_cert = fp.read()
# If required, read in the wifi auth certificate
wifi_auth_cert = b'none'
if args.wifi_cert:
logging.info('Using authentication CA certificate from file {}'.format(
args.wifi_cert))
with open(args.wifi_cert, 'rb') as fp:
wifi_auth_cert = fp.read()
# Load the CA signing key
with open(args.ca_signing_key, 'rb') as fp:
ca_signing_key_pem = fp.read()
ca_signing_key = load_pem_private_key(ca_signing_key_pem,
password=None,
backend=default_backend())
# Load the CA chain of certificates
logging.debug('Loading CA chain')
with open(args.ca_chain, 'rb') as fp:
ca_certificates = []
cur_crt = b''
for line in fp:
if b'BEGIN' in line:
logging.debug('Starting new certificate')
cur_crt = line
elif b'END' in line:
cur_crt += line
logging.debug('Parsing certificate')
if cur_crt:
ca_certificates.append(
load_pem_x509_certificate(cur_crt, default_backend()))
cur_crt = ''
else:
cur_crt += line
logging.info('Using UART {} ({},8n1)'.format(args.uart, args.baud_rate))
ser = serial.Serial(args.uart,
args.baud_rate,
timeout=1,
parity=serial.PARITY_NONE,
stopbits=serial.STOPBITS_ONE,
rtscts=0)
logging.info('Reading CSR from device...')
csr = uart_read_csr(ser)
logging.debug('Got csr {}'.format(csr))
ident_certs = generate_identity_certificate(csr, ca_signing_key,
ca_certificates,
args.valid_length,
args.device_id)
identity = {
'wifiESSID': args.essid,
'wifiUsername': args.wifi_username,
'wifiPassword': args.password,
'wifiAuthType': args.wifi_auth,
'wifiAuthCert': wifi_auth_cert,
'targetHost': args.host,
'targetPort': args.port,
'deviceId': args.device_id,
'serverCaRoot': server_cert,
'identityCertChain': ident_certs,
}
di_raw = decode(identity, asn1Spec=device_identity.DeviceIdentityInfo())
logging.info('Device information: {}'.format(di_raw))
di = der_encoder(di_raw)
r, s = decode_dss_signature(pk.sign(di, ec.ECDSA(hashes.SHA256())))
"""
hexdump.hexdump(di)
hashctx = hashes.Hash(hashes.SHA256(), default_backend())
hashctx.update(di)
logging.debug('Digest:')
hexdump.hexdump(hashctx.finalize())
"""
logging.debug('Device Identity Blob length: {}'.format(len(di)))
logging.debug('Signature = ({}, {})'.format(r, s))
bundle = {
'identityInfo': di_raw,
'identityInfoSignature': {
'r': r,
's': s,
},
}
bundle_raw = decode(bundle,
asn1Spec=device_identity.DeviceIdentityBundle())
bundle_encoded = der_encoder(bundle_raw)
if args.out_file:
logging.debug('Writing to {}'.format(args.out_file))
with open(args.out_file, 'wb+') as fp:
fp.write(bundle_encoded)
ser = serial.Serial(args.uart,
args.baud_rate,
timeout=1,
parity=serial.PARITY_NONE,
stopbits=serial.STOPBITS_ONE,
rtscts=0)
logging.info('Writing identity to device')
uart_write_identity(ser, bundle_encoded)
def testNegInt(self):
assert decoder.decode(-12, asn1Spec=univ.Integer()) == univ.Integer(-12)
def testSimple(self):
s = self.s.clone()
s[1] = univ.OctetString('xx')
assert decoder.decode({'first-name': 'xx'}, asn1Spec=self.s) == s
def testTrue(self):
assert decoder.decode(True, asn1Spec=univ.Boolean()) == univ.Boolean(True)
def testTrueNeg(self):
assert decoder.decode(False, asn1Spec=univ.Boolean()) == univ.Boolean(False)
def testSimple(self):
assert decoder.decode('11111111', asn1Spec=univ.BitString()) == univ.BitString(hexValue='ff')
def testNegInt(self):
assert decoder.decode(-12, asn1Spec=univ.Integer()) == univ.Integer(-12)
def testSimple(self):
assert decoder.decode('Quick brown fox', asn1Spec=univ.OctetString()) == univ.OctetString('Quick brown fox')
def testTrueNeg(self):
assert decoder.decode(False, asn1Spec=univ.Boolean()) == univ.Boolean(False)
def testNull(self):
assert decoder.decode(None, asn1Spec=univ.Null()) == univ.Null('')
def testSimple(self):
assert decoder.decode('Quick brown fox', asn1Spec=univ.OctetString()) == univ.OctetString('Quick brown fox')
def testOne(self):
assert decoder.decode('1.3.6.11', asn1Spec=univ.ObjectIdentifier()) == univ.ObjectIdentifier('1.3.6.11')
def testOne(self):
assert decoder.decode('1.3.6.11', asn1Spec=univ.ObjectIdentifier()) == univ.ObjectIdentifier('1.3.6.11')
def testSimple(self):
assert decoder.decode(1.33, asn1Spec=univ.Real()) == univ.Real(1.33)
def testSimple(self):
s = self.s.clone()
s[0] = univ.Null()
s[1] = univ.OctetString('xx')
s[2] = univ.Integer(33)
assert decoder.decode({'place-holder': None, 'first-name': 'xx', 'age': 33}, asn1Spec=self.s) == s
def TRI_DES_Scenario(n, e, d, data):
# to asn1
public_key = decode({'n': n, 'e': e}, asn1Spec=RsaKey())
der_public_key = der_encode(public_key)
# send public key
with open('public_key', 'wb') as key_file:
key_file.write(der_public_key)
# recieve public key
with open('public_key', 'rb') as key_file:
public_key = key_file.read()
# from asn1 get e,n
public_key, _ = der_decode(public_key, asn1Spec=RsaKey())
public_key = encode(public_key)
e = public_key['e']
n = public_key['n']
# encrypt 3DES's key by RSA
key_as_number = int.from_bytes(KEY_FOR_3DES, 'big')
rsa_ecnrypted_key = RSA_encrypt(n, e, key_as_number)
#print(rsa_ecnrypted_key)
# to asn1
open_key = decode(
{
'alg_id': b'0001',
'key_id': b'key_for_3des',
'n': n,
'e': e,
'c': rsa_ecnrypted_key
},
asn1Spec=RsaFile())
der_file_with_3DES_key = der_encode(open_key)
# send encrypted 3DES's key
with open('file_with_3des_key', 'wb') as file:
file.write(der_file_with_3DES_key)
# recieve encrypted 3DES's key
with open('file_with_3des_key', 'rb') as file:
encrypted_3DES_key = file.read()
# from asn1 get c
encrypted_3DES_key, _ = der_decode(encrypted_3DES_key, asn1Spec=RsaFile())
encrypted_3DES_key = encode(encrypted_3DES_key)
c = encrypted_3DES_key['c']
# rsa decrypt
tri_des_key = RSA_decrypt(n, d, c)
# encrypt data with 3DES
tri_des_key = tri_des_key.to_bytes((tri_des_key.bit_length() + 7) // 8,
'big')
tri_des = triple_des(tri_des_key,
CBC,
b"AWDADADA",
pad=None,
padmode=PAD_PKCS5)
encrypted = tri_des.encrypt(data)
#print(encrypted)
# send encrypted data
with open('ciphertext', 'wb') as ciphertext_file:
ciphertext_file.write(encrypted)
# recieve encrypted data
with open('ciphertext', 'rb') as ciphertext_file:
ciphertext = ciphertext_file.read()
# decrypt data
tri_des = triple_des(KEY_FOR_3DES,
CBC,
b"AWDADADA",
pad=None,
padmode=PAD_PKCS5)
opentext = tri_des.decrypt(ciphertext)
with open('decrypted_data', 'wb') as data:
data.write(opentext)
