def MakeOCSPResponse(issuer_cn, issuer_key, serial, revoked):
# https://tools.ietf.org/html/rfc2560
issuer_name_hash = asn1.OCTETSTRING(
hashlib.sha1(asn1.ToDER(Name(cn=issuer_cn))).digest())
issuer_key_hash = asn1.OCTETSTRING(
hashlib.sha1(asn1.ToDER(issuer_key)).digest())
cert_status = None
if revoked:
cert_status = asn1.Explicit(1, asn1.GeneralizedTime("20100101060000Z"))
else:
cert_status = asn1.Raw(asn1.TagAndLength(0x80 | 0, 0))
basic_resp_data_der = asn1.ToDER(
asn1.SEQUENCE([
asn1.Explicit(2, issuer_key_hash),
asn1.GeneralizedTime("20100101060000Z"), # producedAt
asn1.SEQUENCE([
asn1.SEQUENCE([ # SingleResponse
asn1.SEQUENCE([ # CertID
asn1.SEQUENCE([ # hashAlgorithm
HASH_SHA1,
None,
]),
issuer_name_hash,
issuer_key_hash,
serial,
]),
cert_status,
asn1.GeneralizedTime("20100101060000Z"), # thisUpdate
asn1.Explicit(
0,
asn1.GeneralizedTime("20300101060000Z")), # nextUpdate
]),
]),
]))
basic_resp = asn1.SEQUENCE([
asn1.Raw(basic_resp_data_der),
asn1.SEQUENCE([
SHA1_WITH_RSA_ENCRYPTION,
None,
]),
asn1.BitString(issuer_key.Sign(basic_resp_data_der)),
])
resp = asn1.SEQUENCE([
asn1.ENUMERATED(0),
asn1.Explicit(
0,
asn1.SEQUENCE([
OCSP_TYPE_BASIC,
asn1.OCTETSTRING(asn1.ToDER(basic_resp)),
]))
])
return asn1.ToDER(resp)
def MakeOCSPSingleResponse(issuer_name_hash, issuer_key_hash, serial,
ocsp_state, ocsp_date):
cert_status = None
if ocsp_state == OCSP_STATE_REVOKED:
cert_status = asn1.Explicit(1, asn1.GeneralizedTime("20100101060000Z"))
elif ocsp_state == OCSP_STATE_UNKNOWN:
cert_status = asn1.Raw(asn1.TagAndLength(0x80 | 2, 0))
elif ocsp_state == OCSP_STATE_GOOD:
cert_status = asn1.Raw(asn1.TagAndLength(0x80 | 0, 0))
elif ocsp_state == OCSP_STATE_MISMATCHED_SERIAL:
cert_status = asn1.Raw(asn1.TagAndLength(0x80 | 0, 0))
serial -= 1
else:
raise ValueError('Bad OCSP state: ' + str(ocsp_state))
now = datetime.datetime.fromtimestamp(time.mktime(time.gmtime()))
if ocsp_date == OCSP_DATE_VALID:
thisUpdate = now - datetime.timedelta(days=1)
nextUpdate = thisUpdate + datetime.timedelta(weeks=1)
elif ocsp_date == OCSP_DATE_OLD:
thisUpdate = now - datetime.timedelta(days=1, weeks=1)
nextUpdate = thisUpdate + datetime.timedelta(weeks=1)
elif ocsp_date == OCSP_DATE_EARLY:
thisUpdate = now + datetime.timedelta(days=1)
nextUpdate = thisUpdate + datetime.timedelta(weeks=1)
elif ocsp_date == OCSP_DATE_LONG:
thisUpdate = now - datetime.timedelta(days=365)
nextUpdate = thisUpdate + datetime.timedelta(days=366)
elif ocsp_date == OCSP_DATE_LONGER:
thisUpdate = now - datetime.timedelta(days=367)
nextUpdate = thisUpdate + datetime.timedelta(days=368)
else:
raise ValueError('Bad OCSP date: ' + str(ocsp_date))
return asn1.SEQUENCE([ # SingleResponse
asn1.SEQUENCE([ # CertID
asn1.SEQUENCE([ # hashAlgorithm
HASH_SHA1,
None,
]),
issuer_name_hash,
issuer_key_hash,
serial,
]),
cert_status,
asn1.GeneralizedTime( # thisUpdate
thisUpdate.strftime(GENERALIZED_TIME_FORMAT)),
asn1.Explicit( # nextUpdate
0,
asn1.GeneralizedTime(
nextUpdate.strftime(GENERALIZED_TIME_FORMAT))),
])
def GenerateCertKeyAndOCSP(subject = "127.0.0.1",
ocsp_url = "http://127.0.0.1",
ocsp_states = None,
ocsp_dates = None,
ocsp_produced = OCSP_PRODUCED_VALID,
ip_sans = ["\x7F\x00\x00\x01"],
dns_sans = None,
serial = 0):
'''GenerateCertKeyAndOCSP returns a (cert_and_key_pem, ocsp_der) where:
* cert_and_key_pem contains a certificate and private key in PEM format
with the given subject common name and OCSP URL.
* ocsp_der contains a DER encoded OCSP response or None if ocsp_url is
None'''
if ocsp_states is None:
ocsp_states = [OCSP_STATE_GOOD]
if ocsp_dates is None:
ocsp_dates = [OCSP_DATE_VALID]
if serial == 0:
serial = RandomNumber(16)
cert_der = MakeCertificate(ROOT_CN, bytes(subject), serial, LEAF_KEY,
ROOT_KEY, bytes(ocsp_url), ip_sans=ip_sans,
dns_sans=dns_sans)
cert_pem = DERToPEM(cert_der)
ocsp_der = None
if ocsp_url is not None:
if ocsp_states[0] == OCSP_STATE_UNAUTHORIZED:
ocsp_der = unauthorizedDER
elif ocsp_states[0] == OCSP_STATE_INVALID_RESPONSE:
ocsp_der = '3'
elif ocsp_states[0] == OCSP_STATE_TRY_LATER:
resp = asn1.SEQUENCE([
asn1.ENUMERATED(3),
])
ocsp_der = asn1.ToDER(resp)
elif ocsp_states[0] == OCSP_STATE_INVALID_RESPONSE_DATA:
invalid_data = asn1.ToDER(asn1.OCTETSTRING('not ocsp data'))
basic_resp = asn1.SEQUENCE([
asn1.Raw(invalid_data),
asn1.SEQUENCE([
SHA256_WITH_RSA_ENCRYPTION,
None,
]),
asn1.BitString(ROOT_KEY.Sign(invalid_data)),
])
resp = asn1.SEQUENCE([
asn1.ENUMERATED(0),
asn1.Explicit(0, asn1.SEQUENCE([
OCSP_TYPE_BASIC,
asn1.OCTETSTRING(asn1.ToDER(basic_resp)),
])),
])
ocsp_der = asn1.ToDER(resp)
else:
ocsp_der = MakeOCSPResponse(
ROOT_CN, ROOT_KEY, serial, ocsp_states, ocsp_dates, ocsp_produced)
return (cert_pem + LEAF_KEY_PEM, ocsp_der)
def MakeOCSPResponse(issuer_cn, issuer_key, serial, ocsp_states, ocsp_dates,
ocsp_produced):
# https://tools.ietf.org/html/rfc2560
issuer_name_hash = asn1.OCTETSTRING(
hashlib.sha1(asn1.ToDER(Name(cn=issuer_cn))).digest())
issuer_key_hash = asn1.OCTETSTRING(
hashlib.sha1(asn1.ToDER(issuer_key)).digest())
now = datetime.datetime.fromtimestamp(time.mktime(time.gmtime()))
if ocsp_produced == OCSP_PRODUCED_VALID:
producedAt = now - datetime.timedelta(days=1)
elif ocsp_produced == OCSP_PRODUCED_BEFORE_CERT:
producedAt = datetime.datetime.strptime("19100101050000Z",
GENERALIZED_TIME_FORMAT)
elif ocsp_produced == OCSP_PRODUCED_AFTER_CERT:
producedAt = datetime.datetime.strptime("20321201070000Z",
GENERALIZED_TIME_FORMAT)
else:
raise ValueError('Bad OCSP produced: ' + str(ocsp_produced))
single_responses = [
MakeOCSPSingleResponse(issuer_name_hash, issuer_key_hash, serial,
ocsp_state, ocsp_date)
for ocsp_state, ocsp_date in itertools.izip(ocsp_states, ocsp_dates)
]
basic_resp_data_der = asn1.ToDER(
asn1.SEQUENCE([
asn1.Explicit(2, issuer_key_hash),
asn1.GeneralizedTime(producedAt.strftime(GENERALIZED_TIME_FORMAT)),
asn1.SEQUENCE(single_responses),
]))
basic_resp = asn1.SEQUENCE([
asn1.Raw(basic_resp_data_der),
asn1.SEQUENCE([
SHA256_WITH_RSA_ENCRYPTION,
None,
]),
asn1.BitString(issuer_key.Sign(basic_resp_data_der)),
])
resp = asn1.SEQUENCE([
asn1.ENUMERATED(0),
asn1.Explicit(
0,
asn1.SEQUENCE([
OCSP_TYPE_BASIC,
asn1.OCTETSTRING(asn1.ToDER(basic_resp)),
]))
])
return asn1.ToDER(resp)
def MakeCertificate(
issuer_cn, subject_cn, serial, pubkey, privkey, ocsp_url = None,
ca_issuers_url = None, is_ca=False, path_len=None, ip_sans=None,
dns_sans=None):
'''MakeCertificate returns a DER encoded certificate, signed by privkey.'''
extensions = asn1.SEQUENCE([])
# Default subject name fields
c = "XX"
o = "Testing Org"
if is_ca:
# Root certificate.
c = None
o = None
extensions.children.append(
asn1.SEQUENCE([
BASIC_CONSTRAINTS,
True,
asn1.OCTETSTRING(asn1.ToDER(asn1.SEQUENCE([
True, # IsCA
] + ([path_len] if path_len is not None else []) # Path len
))),
]))
if ip_sans is not None or dns_sans is not None:
sans = []
if dns_sans is not None:
for dns_name in dns_sans:
sans.append(
asn1.Raw(asn1.TagAndLength(0x82, len(dns_name)) + dns_name))
if ip_sans is not None:
for ip_addr in ip_sans:
sans.append(
asn1.Raw(asn1.TagAndLength(0x87, len(ip_addr)) + ip_addr))
extensions.children.append(
asn1.SEQUENCE([
SUBJECT_ALTERNATIVE_NAME,
# There is implicitly a critical=False here. Since false is the
# default, encoding the value would be invalid DER.
asn1.OCTETSTRING(asn1.ToDER(asn1.SEQUENCE(sans)))
]))
if ocsp_url is not None or ca_issuers_url is not None:
aia_entries = []
if ocsp_url is not None:
aia_entries.append(
asn1.SEQUENCE([
AIA_OCSP,
asn1.Raw(asn1.TagAndLength(0x86, len(ocsp_url)) + ocsp_url),
]))
if ca_issuers_url is not None:
aia_entries.append(
asn1.SEQUENCE([
AIA_CA_ISSUERS,
asn1.Raw(asn1.TagAndLength(0x86,
len(ca_issuers_url)) + ca_issuers_url),
]))
extensions.children.append(
asn1.SEQUENCE([
AUTHORITY_INFORMATION_ACCESS,
# There is implicitly a critical=False here. Since false is the default,
# encoding the value would be invalid DER.
asn1.OCTETSTRING(asn1.ToDER(asn1.SEQUENCE(aia_entries))),
]))
extensions.children.append(
asn1.SEQUENCE([
CERT_POLICIES,
# There is implicitly a critical=False here. Since false is the default,
# encoding the value would be invalid DER.
asn1.OCTETSTRING(asn1.ToDER(asn1.SEQUENCE([
asn1.SEQUENCE([ # PolicyInformation
CERT_POLICY_OID,
]),
]))),
])
)
tbsCert = asn1.ToDER(asn1.SEQUENCE([
asn1.Explicit(0, 2), # Version
serial,
asn1.SEQUENCE([SHA256_WITH_RSA_ENCRYPTION, None]), # SignatureAlgorithm
Name(cn = issuer_cn), # Issuer
asn1.SEQUENCE([ # Validity
asn1.UTCTime("100101060000Z"), # NotBefore
asn1.UTCTime("321201060000Z"), # NotAfter
]),
Name(cn = subject_cn, c = c, o = o), # Subject
asn1.SEQUENCE([ # SubjectPublicKeyInfo
asn1.SEQUENCE([ # Algorithm
PUBLIC_KEY_RSA,
None,
]),
asn1.BitString(asn1.ToDER(pubkey)),
]),
asn1.Explicit(3, extensions),
]))
return asn1.ToDER(asn1.SEQUENCE([
asn1.Raw(tbsCert),
asn1.SEQUENCE([
SHA256_WITH_RSA_ENCRYPTION,
None,
]),
asn1.BitString(privkey.Sign(tbsCert)),
]))
def MakeCertificate(issuer_cn,
subject_cn,
serial,
pubkey,
privkey,
ocsp_url=None):
'''MakeCertificate returns a DER encoded certificate, signed by privkey.'''
extensions = asn1.SEQUENCE([])
# Default subject name fields
c = "XX"
o = "Testing Org"
if issuer_cn == subject_cn:
# Root certificate.
c = None
o = None
extensions.children.append(
asn1.SEQUENCE([
BASIC_CONSTRAINTS,
True,
asn1.OCTETSTRING(
asn1.ToDER(asn1.SEQUENCE([
True, # IsCA
0, # Path len
]))),
]))
if ocsp_url is not None:
extensions.children.append(
asn1.SEQUENCE([
AUTHORITY_INFORMATION_ACCESS,
# There is implicitly a critical=False here. Since false is the default,
# encoding the value would be invalid DER.
asn1.OCTETSTRING(
asn1.ToDER(
asn1.SEQUENCE([
asn1.SEQUENCE([
AIA_OCSP,
asn1.Raw(
asn1.TagAndLength(0x86, len(ocsp_url)) +
ocsp_url),
]),
]))),
]))
extensions.children.append(
asn1.SEQUENCE([
CERT_POLICIES,
# There is implicitly a critical=False here. Since false is the default,
# encoding the value would be invalid DER.
asn1.OCTETSTRING(
asn1.ToDER(
asn1.SEQUENCE([
asn1.SEQUENCE([ # PolicyInformation
CERT_POLICY_OID,
]),
]))),
]))
tbsCert = asn1.ToDER(
asn1.SEQUENCE([
asn1.Explicit(0, 2), # Version
serial,
asn1.SEQUENCE([SHA256_WITH_RSA_ENCRYPTION,
None]), # SignatureAlgorithm
Name(cn=issuer_cn), # Issuer
asn1.SEQUENCE([ # Validity
asn1.UTCTime("100101060000Z"), # NotBefore
asn1.UTCTime("321201060000Z"), # NotAfter
]),
Name(cn=subject_cn, c=c, o=o), # Subject
asn1.SEQUENCE([ # SubjectPublicKeyInfo
asn1.SEQUENCE([ # Algorithm
PUBLIC_KEY_RSA,
None,
]),
asn1.BitString(asn1.ToDER(pubkey)),
]),
asn1.Explicit(3, extensions),
]))
return asn1.ToDER(
asn1.SEQUENCE([
asn1.Raw(tbsCert),
asn1.SEQUENCE([
SHA256_WITH_RSA_ENCRYPTION,
None,
]),
asn1.BitString(privkey.Sign(tbsCert)),
]))
