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"""ASN.1 specification for X509 extensions."""
from ct.crypto.asn1 import named_value
from ct.crypto.asn1 import oid
from ct.crypto.asn1 import tag
from ct.crypto.asn1 import types
from ct.crypto.asn1 import x509_common
from ct.crypto.asn1 import x509_name
# Standard extensions from RFC 5280.
class BasicConstraints(types.Sequence):
print_delimiter = ", "
components = (
(types.Component("cA", types.Boolean, default=False)),
(types.Component("pathLenConstraint", types.Integer, optional=True))
)
class SubjectAlternativeNames(types.SequenceOf):
print_delimiter = ", "
component = x509_name.GeneralName
class KeyUsage(types.NamedBitList):
DIGITAL_SIGNATURE = named_value.NamedValue("digitalSignature", 0)
NON_REPUDIATION = named_value.NamedValue("nonRepudiation", 1)
KEY_ENCIPHERMENT = named_value.NamedValue("keyEncipherment", 2)
DATA_ENCIPHERMENT = named_value.NamedValue("dataEncipherment", 3)
KEY_AGREEMENT = named_value.NamedValue("keyAgreement", 4)
KEY_CERT_SIGN = named_value.NamedValue("keyCertSign", 5)
CRL_SIGN = named_value.NamedValue("cRLSign", 6)
ENCIPHER_ONLY = named_value.NamedValue("encipherOnly", 7)
DECIPHER_ONLY = named_value.NamedValue("decipherOnly", 8)
named_bit_list = (DIGITAL_SIGNATURE, NON_REPUDIATION, KEY_ENCIPHERMENT,
DATA_ENCIPHERMENT, KEY_AGREEMENT, KEY_CERT_SIGN,
CRL_SIGN, ENCIPHER_ONLY, DECIPHER_ONLY)
class KeyPurposeID(oid.ObjectIdentifier):
pass
class ExtendedKeyUsage(types.SequenceOf):
print_delimiter = ", "
print_labels = False
component = KeyPurposeID
class KeyIdentifier(types.OctetString):
pass
class SubjectKeyIdentifier(KeyIdentifier):
pass
KEY_IDENTIFIER = "keyIdentifier"
AUTHORITY_CERT_ISSUER = "authorityCertIssuer"
AUTHORITY_CERT_SERIAL_NUMBER = "authorityCertSerialNumber"
class AuthorityKeyIdentifier(types.Sequence):
components = (
types.Component(KEY_IDENTIFIER, KeyIdentifier.implicit(0), optional=True),
types.Component(AUTHORITY_CERT_ISSUER, x509_name.GeneralNames.implicit(1),
optional=True),
types.Component(AUTHORITY_CERT_SERIAL_NUMBER,
x509_common.CertificateSerialNumber.implicit(2),
optional=True)
)
class DisplayText(types.Choice):
components = {
"ia5String": types.IA5String,
"visibleString": types.VisibleString,
"bmpString": types.BMPString,
"utf8String": types.UTF8String
}
class NoticeNumbers(types.SequenceOf):
component = types.Integer
class NoticeReference(types.Sequence):
components = (
types.Component("organization", DisplayText),
types.Component("noticeNumbers", NoticeNumbers)
)
NOTICE_REF = "noticeRef"
EXPLICIT_TEXT = "explicitText"
class UserNotice(types.Sequence):
components = (
types.Component(NOTICE_REF, NoticeReference, optional=True),
types.Component(EXPLICIT_TEXT, DisplayText, optional=True)
)
class CPSuri(types.IA5String):
pass
_POLICY_QUALIFIER_DICT = {
oid.ID_QT_CPS: CPSuri,
oid.ID_QT_UNOTICE: UserNotice
}
POLICY_QUALIFIER_ID = "policyQualifierId"
QUALIFIER = "qualifier"
class PolicyQualifierInfo(types.Sequence):
print_labels = False
print_delimiter = ": "
components = (
types.Component(POLICY_QUALIFIER_ID, oid.ObjectIdentifier),
types.Component(QUALIFIER, types.Any, defined_by="policyQualifierId",
lookup=_POLICY_QUALIFIER_DICT)
)
class PolicyQualifiers(types.SequenceOf):
print_labels = False
component = PolicyQualifierInfo
POLICY_IDENTIFIER = "policyIdentifier"
POLICY_QUALIFIERS = "policyQualifiers"
class PolicyInformation(types.Sequence):
components = (
types.Component(POLICY_IDENTIFIER, oid.ObjectIdentifier),
types.Component(POLICY_QUALIFIERS, PolicyQualifiers, optional=True)
)
class CertificatePolicies(types.SequenceOf):
component = PolicyInformation
FULL_NAME = "fullName"
RELATIVE_NAME = "nameRelativetoCRLIssuer"
class DistributionPointName(types.Choice):
components = {
FULL_NAME: x509_name.GeneralNames.implicit(0),
RELATIVE_NAME: x509_name.RelativeDistinguishedName.implicit(1)
}
class ReasonFlags(types.NamedBitList):
UNUSED = named_value.NamedValue("unused", 0)
KEY_COMPROMISE = named_value.NamedValue("keyCompromise", 1)
CA_COMPROMISE = named_value.NamedValue("cACompromise", 2),
AFFILIATION_CHANGED = named_value.NamedValue("affiliationChanged", 3)
SUPERSEDED = named_value.NamedValue("superseded", 4)
CESSATION_OF_OPERATION = named_value.NamedValue("cessationOfOperation", 5)
CERTIFICATE_HOLD = named_value.NamedValue("certificateHold", 6)
PRIVILEGE_WITHDRAWN = named_value.NamedValue("privilegeWithdrawn", 7)
AA_COMPROMISE = named_value.NamedValue("aACompromise", 8)
named_bit_list = (UNUSED, KEY_COMPROMISE, CA_COMPROMISE,
AFFILIATION_CHANGED, SUPERSEDED, CESSATION_OF_OPERATION,
CERTIFICATE_HOLD, PRIVILEGE_WITHDRAWN, AA_COMPROMISE)
DISTRIBUTION_POINT = "distributionPoint"
REASONS = "reasons"
CRL_ISSUER = "cRLIssuer"
class DistributionPoint(types.Sequence):
components = (
types.Component(DISTRIBUTION_POINT, DistributionPointName.explicit(0),
optional=True),
types.Component(REASONS, ReasonFlags.implicit(1), optional=True),
types.Component(CRL_ISSUER, x509_name.GeneralNames.implicit(2),
optional=True)
)
class CRLDistributionPoints(types.SequenceOf):
component = DistributionPoint
ACCESS_METHOD = "accessMethod"
ACCESS_LOCATION = "accessLocation"
class AccessDescription(types.Sequence):
print_labels = False
print_delimiter = ": "
components = (
types.Component(ACCESS_METHOD, oid.ObjectIdentifier),
types.Component(ACCESS_LOCATION, x509_name.GeneralName)
)
# Called AuthorityInfoAccessSyntax in RFC 5280.
class AuthorityInfoAccess(types.SequenceOf):
component = AccessDescription
class SignedCertificateTimestampList(types.OctetString):
pass
# Hack! This is not a valid ASN.1 definition but it works: an extension value
# value is defined as a DER-encoded value wrapped in an OctetString.
# This is functionally equivalent to an Any type that is tagged with the
# OctetString tag.
@types.Universal(4, tag.PRIMITIVE)
class ExtensionValue(types.Any):
pass
_EXTENSION_DICT = {
oid.ID_CE_BASIC_CONSTRAINTS: BasicConstraints,
oid.ID_CE_SUBJECT_ALT_NAME: SubjectAlternativeNames,
oid.ID_CE_KEY_USAGE: KeyUsage,
oid.ID_CE_EXT_KEY_USAGE: ExtendedKeyUsage,
oid.ID_CE_SUBJECT_KEY_IDENTIFIER: SubjectKeyIdentifier,
oid.ID_CE_AUTHORITY_KEY_IDENTIFIER: AuthorityKeyIdentifier,
oid.ID_CE_CERTIFICATE_POLICIES: CertificatePolicies,
oid.ID_CE_CRL_DISTRIBUTION_POINTS: CRLDistributionPoints,
oid.ID_PE_AUTHORITY_INFO_ACCESS: AuthorityInfoAccess,
oid.CT_POISON: types.Null,
oid.CT_EMBEDDED_SCT_LIST: SignedCertificateTimestampList
}
class Extension(types.Sequence):
print_delimiter = ", "
components = (
types.Component("extnID", oid.ObjectIdentifier),
types.Component("critical", types.Boolean, default=False),
types.Component("extnValue", ExtensionValue, defined_by="extnID",
lookup=_EXTENSION_DICT)
)
class Extensions(types.SequenceOf):
component = Extension
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