def verify_sct(chain, sct_tls, log_key_pem):
sct = client_pb2.SignedCertificateTimestamp()
tls_message.decode(sct_tls, sct)
log_key = pem.from_pem(log_key_pem, "PUBLIC KEY")[0]
key_info = verify.create_key_info_from_raw_key(log_key)
lv = verify.LogVerifier(key_info)
print lv.verify_sct(sct, chain)
def verify_sct(chain, sct_tls, log_key_pem):
sct = client_pb2.SignedCertificateTimestamp()
tls_message.decode(sct_tls, sct)
log_key = pem.from_pem(log_key_pem, 'PUBLIC KEY')[0]
key_info = verify.create_key_info_from_raw_key(log_key)
lv = verify.LogVerifier(key_info)
print lv.verify_sct(sct, chain)
def __init__(self, key_info, merkle_verifier=merkle.MerkleVerifier()):
"""Initialize from KeyInfo protocol buffer and a MerkleVerifier."""
self.__merkle_verifier = merkle_verifier
if key_info.type != client_pb2.KeyInfo.ECDSA:
raise error.UnsupportedAlgorithmError("Key type %d not supported" % key_info.type)
# Will raise a PemError on invalid encoding
self.__der, _ = pem.from_pem(key_info.pem_key, LogVerifier.__ECDSA_READ_MARKERS)
try:
self.__pubkey = ecdsa.VerifyingKey.from_der(self.__der)
except ecdsa.der.UnexpectedDER as e:
raise error.EncodingError(e)
def __init__(self, key_info, merkle_verifier=merkle.MerkleVerifier()):
"""Initialize from KeyInfo protocol buffer and a MerkleVerifier."""
self.__merkle_verifier = merkle_verifier
if key_info.type != client_pb2.KeyInfo.ECDSA:
raise error.UnsupportedAlgorithmError("Key type %d not supported" %
key_info.type)
# Will raise a PemError on invalid encoding
self.__der, _ = pem.from_pem(key_info.pem_key,
LogVerifier.__ECDSA_READ_MARKERS)
try:
self.__pubkey = ecdsa.VerifyingKey.from_der(self.__der)
except ecdsa.der.UnexpectedDER as e:
raise error.EncodingError(e)
def from_pem(cls, pem_string, strict_der=True):
"""Read a single PEM-encoded certificate from a string.
Args:
pem_string: the certificate string.
strict_der: if False, tolerate some non-fatal DER errors.
Returns:
a Certificate object.
Raises:
ct.crypto.pem.PemError, ct.crypto.error.ASN1Error: the string
does not contain a valid PEM certificate.
"""
der_cert, _ = pem.from_pem(pem_string, cls.PEM_MARKERS)
return cls.from_der(der_cert, strict_der=strict_der)
def from_pem(cls, pem_string, strict_der=True):
"""Read a single PEM-encoded certificate from a string.
Args:
pem_string: the certificate string.
strict_der: if False, tolerate some non-fatal DER errors.
Returns:
a Certificate object.
Raises:
ct.crypto.pem.PemError, ct.crypto.error.ASN1Error: the string
does not contain a valid PEM certificate.
"""
der_cert, _ = pem.from_pem(pem_string, cls.PEM_MARKERS)
return cls.from_der(der_cert, strict_der=strict_der)
def __init__(self, key_info):
"""Creates a verifier that uses a PEM-encoded ECDSA public key.
Args:
- key_info: KeyInfo protobuf message
Raises:
- PemError: If the key has an invalid encoding
"""
if (key_info.type != client_pb2.KeyInfo.ECDSA):
raise error.UnsupportedAlgorithmError(
"Expected ECDSA key, but got key type %d" % key_info.type)
# Will raise a PemError on invalid encoding
self.__der, _ = pem.from_pem(key_info.pem_key, self.__READ_MARKERS)
try:
self.__key = ecdsa.VerifyingKey.from_der(self.__der)
except ecdsa.der.UnexpectedDER as e:
raise error.EncodingError(e)
def __init__(self, key_info):
"""Creates a verifier that uses a PEM-encoded RSA public key.
Args:
- key_info: KeyInfo protobuf message
Raises:
- PemError: If the key has an invalid encoding
"""
if (key_info.type != client_pb2.KeyInfo.RSA):
raise error.UnsupportedAlgorithmError(
"Expected RSA key, but got key type %d" % key_info.type)
# Will raise a PemError on invalid encoding
self.__der, _ = pem.from_pem(key_info.pem_key, self.__READ_MARKERS)
try:
self.__key = Crypto.PublicKey.RSA.importKey(self.__der)
except (ValueError, IndexError, TypeError) as e:
raise error.EncodingError(e)
def __init__(self, key_info):
"""Creates a verifier that uses a PEM-encoded ECDSA public key.
Args:
- key_info: KeyInfo protobuf message
Raises:
- PemError: If the key has an invalid encoding
"""
if (key_info.type != client_pb2.KeyInfo.ECDSA):
raise error.UnsupportedAlgorithmError(
"Expected ECDSA key, but got key type %d" % key_info.type)
# Will raise a PemError on invalid encoding
self.__der, _ = pem.from_pem(key_info.pem_key, self.__READ_MARKERS)
try:
self.__key = ecdsa.VerifyingKey.from_der(self.__der)
except ecdsa.der.UnexpectedDER as e:
raise error.EncodingError(e)
def __init__(self, key_info):
"""Creates a verifier that uses a PEM-encoded RSA public key.
Args:
- key_info: KeyInfo protobuf message
Raises:
- PemError: If the key has an invalid encoding
"""
if (key_info.type != client_pb2.KeyInfo.RSA):
raise error.UnsupportedAlgorithmError(
"Expected RSA key, but got key type %d" % key_info.type)
# Will raise a PemError on invalid encoding
self.__der, _ = pem.from_pem(key_info.pem_key, self.__READ_MARKERS)
try:
self.__key = Crypto.PublicKey.RSA.importKey(self.__der)
except (ValueError, IndexError, TypeError) as e:
raise error.EncodingError(e)
def getIssuersFromAIA(cert):
tbs = cert.getComponentByName('tbsCertificate')
extensions = tbs.getComponentByName('extensions') or []
allIssuers = []
for extension in extensions:
oid = extension.getComponentByName('extnID')
if oid != id_pe_authorityInfoAccess:
continue
print extension.prettyPrint()
value, rest = decoder.decode(extension.getComponentByName('extnValue'),
asn1Spec=univ.OctetString())
assert rest == ""
aia, rest = decoder.decode(value, asn1Spec=AuthorityInfoAccessSyntax())
assert rest == ""
print aia.prettyPrint()
for ad in aia:
oid = ad.getComponentByName('accessMethod')
if oid != id_ad_caIssuers:
continue
print ad.prettyPrint()
loc = ad.getComponentByName('accessLocation').\
getComponentByName('uniformResourceIdentifier')
print type(loc), loc
certHandle = urlopen(str(loc))
# RFC 5280 says this should either be 'application/pkix-cert' or
# 'application/pkcs7-mime' (in which case the result should be a
# "certs-only" PCKS#7 response, as specified in RFC 2797). Of
# course, we see other values, so just try both formats.
print certHandle.info().gettype()
issuer = certHandle.read()
# Have we got an (incorrect, but let's fix it) PEM encoded cert?
if issuer.startswith('-----'):
try:
(issuer, _) = from_pem(issuer, ['CERTIFICATE'])
except PemError as e:
print "PEM decode failed:", e
print "For cert:", issuer
# Is it a certificate?
try:
cert, rest = decoder.decode(issuer, asn1Spec=certType)
assert rest == ""
allIssuers.append(cert)
continue
except PyAsn1Error as e:
# On failure, try the next thing
print "Cert decode failed:", e
pass
# If not, it had better be PKCS#7 "certs-only"
try:
pkcs7, rest = decoder.decode(issuer,
asn1Spec=rfc2315.ContentInfo())
assert rest == ""
assert pkcs7.getComponentByName(
'contentType') == rfc2315.signedData
signedData = decoder.decode(
pkcs7.getComponentByName('content'),
asn1Spec=rfc2315.SignedData())
except PyAsn1Error as e:
# Give up
print "PKCS#7 decode also failed:", e
print "Skipping issuer URL:", loc
continue
for signedDatum in signedData:
# FIXME: why does this happen? Example is at
# http://crt.usertrust.com/AddTrustExternalCARoot.p7c.
if signedDatum == '':
print "** Skipping strange Any('') in PKCS7 **"
continue
certs = signedDatum.getComponentByName('certificates')
for c in certs:
cert = c.getComponentByName('certificate')
allIssuers.append(cert)
return allIssuers
def getIssuersFromAIA(cert):
tbs = cert.getComponentByName('tbsCertificate')
extensions = tbs.getComponentByName('extensions') or []
allIssuers = []
for extension in extensions:
oid = extension.getComponentByName('extnID')
if oid != id_pe_authorityInfoAccess:
continue
print extension.prettyPrint()
value, rest = decoder.decode(extension.getComponentByName('extnValue'),
asn1Spec=univ.OctetString())
assert rest == ""
aia, rest = decoder.decode(value, asn1Spec=AuthorityInfoAccessSyntax())
assert rest == ""
print aia.prettyPrint()
for ad in aia:
oid = ad.getComponentByName('accessMethod')
if oid != id_ad_caIssuers:
continue
print ad.prettyPrint()
loc = ad.getComponentByName('accessLocation').\
getComponentByName('uniformResourceIdentifier')
print type(loc), loc
certHandle = urlopen(str(loc))
# RFC 5280 says this should either be 'application/pkix-cert' or
# 'application/pkcs7-mime' (in which case the result should be a
# "certs-only" PCKS#7 response, as specified in RFC 2797). Of
# course, we see other values, so just try both formats.
print certHandle.info().gettype()
issuer = certHandle.read()
# Have we got an (incorrect, but let's fix it) PEM encoded cert?
if issuer.startswith('-----'):
try:
(issuer, _) = from_pem(issuer, ['CERTIFICATE'])
except PemError as e:
print "PEM decode failed:", e
print "For cert:", issuer
# Is it a certificate?
try:
cert, rest = decoder.decode(issuer, asn1Spec=certType)
assert rest == ""
allIssuers.append(cert)
continue
except PyAsn1Error as e:
# On failure, try the next thing
print "Cert decode failed:", e
pass
# If not, it had better be PKCS#7 "certs-only"
try:
pkcs7, rest = decoder.decode(issuer, asn1Spec=rfc2315.ContentInfo())
assert rest == ""
assert pkcs7.getComponentByName('contentType') == rfc2315.signedData
signedData = decoder.decode(pkcs7.getComponentByName('content'),
asn1Spec=rfc2315.SignedData())
except PyAsn1Error as e:
# Give up
print "PKCS#7 decode also failed:", e
print "Skipping issuer URL:", loc
continue
for signedDatum in signedData:
# FIXME: why does this happen? Example is at
# http://crt.usertrust.com/AddTrustExternalCARoot.p7c.
if signedDatum == '':
print "** Skipping strange Any('') in PKCS7 **"
continue
certs = signedDatum.getComponentByName('certificates')
for c in certs:
cert = c.getComponentByName('certificate')
allIssuers.append(cert)
return allIssuers
'3uMziiLOl/fHTDM0YDOhBRuiBARsV4UvxG2LdNgoIGLrtCzWE0J\n'
'5APC2em4JlvR8EEEFMoA==\n'
'-----END PUBLIC KEY-----\n')
logurl = 'http://ct.googleapis.com/pilot';
logdns = 'pilot.ct.googleapis.com'
response = urllib2.urlopen('%s/ct/v1/get-entries?start=%s&end=%s'
% (logurl, index, index))
j = response.read()
j = json.loads(j)
leaf_input = j['entries'][0]['leaf_input']
logging.info('leaf = %s', leaf_input)
leaf = base64.b64decode(leaf_input)
leaf_hash = hashlib.sha256(chr(0) + leaf).digest()
keyinfo = verify.create_key_info_from_raw_key(pem.from_pem(keypem, 'PUBLIC KEY')[0])
log_verifier = verify.LogVerifier(keyinfo)
lookup = CTDNSLookup(logdns, log_verifier)
sth = lookup.GetSTH()
logging.info('sth = %s', sth)
logging.info('hash = %s', base64.b64encode(leaf_hash))
verifier = merkle.MerkleVerifier()
index = int(index)
audit_path = []
prev = None
apl = verifier.audit_path_length(index, sth.tree_size)
for level in range(0, apl):
h = lookup.GetEntry(level, index, sth.tree_size)
logging.info('hash = %s', base64.b64encode(h))
def test_from_pem(self):
self.assertEqual((self.BLOB, self.MARKER),
pem.from_pem(self.PEM_BLOB, (self.MARKER,)))
# from_pem will also take a plain string for the marker
self.assertEqual((self.BLOB, self.MARKER),
pem.from_pem(self.PEM_BLOB, self.MARKER))
'5APC2em4JlvR8EEEFMoA==\n'
'-----END PUBLIC KEY-----\n')
logurl = 'http://ct.googleapis.com/pilot'
logdns = 'pilot.ct.googleapis.com'
response = urllib2.urlopen('%s/ct/v1/get-entries?start=%s&end=%s' %
(logurl, index, index))
j = response.read()
j = json.loads(j)
leaf_input = j['entries'][0]['leaf_input']
logging.info('leaf = %s', leaf_input)
leaf = base64.b64decode(leaf_input)
leaf_hash = hashlib.sha256(chr(0) + leaf).digest()
keyinfo = verify.create_key_info_from_raw_key(
pem.from_pem(keypem, 'PUBLIC KEY')[0])
log_verifier = verify.LogVerifier(keyinfo)
lookup = CTDNSLookup(logdns, log_verifier)
sth = lookup.GetSTH()
logging.info('sth = %s', sth)
logging.info('hash = %s', base64.b64encode(leaf_hash))
verifier = merkle.MerkleVerifier()
index = int(index)
audit_path = []
prev = None
apl = verifier.audit_path_length(index, sth.tree_size)
for level in range(0, apl):
h = lookup.GetEntry(level, index, sth.tree_size)
logging.info('hash = %s', base64.b64encode(h))
def test_from_pem(self):
self.assertEqual((self.BLOB, self.MARKER),
pem.from_pem(self.PEM_BLOB, (self.MARKER, )))
# from_pem will also take a plain string for the marker
self.assertEqual((self.BLOB, self.MARKER),
pem.from_pem(self.PEM_BLOB, self.MARKER))
def test_from_pem(self):
self.assertEqual((self.BLOB, self.MARKER),
pem.from_pem(self.PEM_BLOB, (self.MARKER,)))
