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# This file is dual licensed under the terms of the Apache License, Version # 2.0, and the BSD License. See the LICENSE file in the root of this repository # for complete details. from __future__ import absolute_import, division, print_function import calendar import ipaddress import six from cryptography import utils, x509 from cryptography.hazmat.backends.openssl.decode_asn1 import ( _CRL_ENTRY_REASON_ENUM_TO_CODE, _DISTPOINT_TYPE_FULLNAME, _DISTPOINT_TYPE_RELATIVENAME, ) from cryptography.x509.name import _ASN1Type from cryptography.x509.oid import ( CRLEntryExtensionOID, ExtensionOID, OCSPExtensionOID, ) def _encode_asn1_int(backend, x): """ Converts a python integer to an ASN1_INTEGER. The returned ASN1_INTEGER will not be garbage collected (to support adding them to structs that take ownership of the object). Be sure to register it for GC if it will be discarded after use. """ # Convert Python integer to OpenSSL "bignum" in case value exceeds # machine's native integer limits (note: `int_to_bn` doesn't automatically # GC). i = backend._int_to_bn(x) i = backend._ffi.gc(i, backend._lib.BN_free) # Wrap in an ASN.1 integer. Don't GC -- as documented. i = backend._lib.BN_to_ASN1_INTEGER(i, backend._ffi.NULL) backend.openssl_assert(i != backend._ffi.NULL) return i def _encode_asn1_int_gc(backend, x): i = _encode_asn1_int(backend, x) i = backend._ffi.gc(i, backend._lib.ASN1_INTEGER_free) return i def _encode_asn1_str(backend, data): """ Create an ASN1_OCTET_STRING from a Python byte string. """ s = backend._lib.ASN1_OCTET_STRING_new() res = backend._lib.ASN1_OCTET_STRING_set(s, data, len(data)) backend.openssl_assert(res == 1) return s def _encode_asn1_utf8_str(backend, string): """ Create an ASN1_UTF8STRING from a Python unicode string. This object will be an ASN1_STRING with UTF8 type in OpenSSL and can be decoded with ASN1_STRING_to_UTF8. """ s = backend._lib.ASN1_UTF8STRING_new() res = backend._lib.ASN1_STRING_set( s, string.encode("utf8"), len(string.encode("utf8")) ) backend.openssl_assert(res == 1) return s def _encode_asn1_str_gc(backend, data): s = _encode_asn1_str(backend, data) s = backend._ffi.gc(s, backend._lib.ASN1_OCTET_STRING_free) return s def _encode_inhibit_any_policy(backend, inhibit_any_policy): return _encode_asn1_int_gc(backend, inhibit_any_policy.skip_certs) def _encode_name(backend, name): """ The X509_NAME created will not be gc'd. Use _encode_name_gc if needed. """ subject = backend._lib.X509_NAME_new() for rdn in name.rdns: set_flag = 0 # indicate whether to add to last RDN or create new RDN for attribute in rdn: name_entry = _encode_name_entry(backend, attribute) # X509_NAME_add_entry dups the object so we need to gc this copy name_entry = backend._ffi.gc( name_entry, backend._lib.X509_NAME_ENTRY_free ) res = backend._lib.X509_NAME_add_entry( subject, name_entry, -1, set_flag ) backend.openssl_assert(res == 1) set_flag = -1 return subject def _encode_name_gc(backend, attributes): subject = _encode_name(backend, attributes) subject = backend._ffi.gc(subject, backend._lib.X509_NAME_free) return subject def _encode_sk_name_entry(backend, attributes): """ The sk_X509_NAME_ENTRY created will not be gc'd. """ stack = backend._lib.sk_X509_NAME_ENTRY_new_null() for attribute in attributes: name_entry = _encode_name_entry(backend, attribute) res = backend._lib.sk_X509_NAME_ENTRY_push(stack, name_entry) backend.openssl_assert(res >= 1) return stack def _encode_name_entry(backend, attribute): if attribute._type is _ASN1Type.BMPString: value = attribute.value.encode("utf_16_be") elif attribute._type is _ASN1Type.UniversalString: value = attribute.value.encode("utf_32_be") else: value = attribute.value.encode("utf8") obj = _txt2obj_gc(backend, attribute.oid.dotted_string) name_entry = backend._lib.X509_NAME_ENTRY_create_by_OBJ( backend._ffi.NULL, obj, attribute._type.value, value, len(value) ) return name_entry def _encode_crl_number_delta_crl_indicator(backend, ext): return _encode_asn1_int_gc(backend, ext.crl_number) def _encode_issuing_dist_point(backend, ext): idp = backend._lib.ISSUING_DIST_POINT_new() backend.openssl_assert(idp != backend._ffi.NULL) idp = backend._ffi.gc(idp, backend._lib.ISSUING_DIST_POINT_free) idp.onlyuser = 255 if ext.only_contains_user_certs else 0 idp.onlyCA = 255 if ext.only_contains_ca_certs else 0 idp.indirectCRL = 255 if ext.indirect_crl else 0 idp.onlyattr = 255 if ext.only_contains_attribute_certs else 0 if ext.only_some_reasons: idp.onlysomereasons = _encode_reasonflags( backend, ext.only_some_reasons ) if ext.full_name: idp.distpoint = _encode_full_name(backend, ext.full_name) if ext.relative_name: idp.distpoint = _encode_relative_name(backend, ext.relative_name) return idp def _encode_crl_reason(backend, crl_reason): asn1enum = backend._lib.ASN1_ENUMERATED_new() backend.openssl_assert(asn1enum != backend._ffi.NULL) asn1enum = backend._ffi.gc(asn1enum, backend._lib.ASN1_ENUMERATED_free) res = backend._lib.ASN1_ENUMERATED_set( asn1enum, _CRL_ENTRY_REASON_ENUM_TO_CODE[crl_reason.reason] ) backend.openssl_assert(res == 1) return asn1enum def _encode_invalidity_date(backend, invalidity_date): time = backend._lib.ASN1_GENERALIZEDTIME_set( backend._ffi.NULL, calendar.timegm(invalidity_date.invalidity_date.timetuple()), ) backend.openssl_assert(time != backend._ffi.NULL) time = backend._ffi.gc(time, backend._lib.ASN1_GENERALIZEDTIME_free) return time def _encode_certificate_policies(backend, certificate_policies): cp = backend._lib.sk_POLICYINFO_new_null() backend.openssl_assert(cp != backend._ffi.NULL) cp = backend._ffi.gc(cp, backend._lib.sk_POLICYINFO_free) for policy_info in certificate_policies: pi = backend._lib.POLICYINFO_new() backend.openssl_assert(pi != backend._ffi.NULL) res = backend._lib.sk_POLICYINFO_push(cp, pi) backend.openssl_assert(res >= 1) oid = _txt2obj(backend, policy_info.policy_identifier.dotted_string) pi.policyid = oid if policy_info.policy_qualifiers: pqis = backend._lib.sk_POLICYQUALINFO_new_null() backend.openssl_assert(pqis != backend._ffi.NULL) for qualifier in policy_info.policy_qualifiers: pqi = backend._lib.POLICYQUALINFO_new() backend.openssl_assert(pqi != backend._ffi.NULL) res = backend._lib.sk_POLICYQUALINFO_push(pqis, pqi) backend.openssl_assert(res >= 1) if isinstance(qualifier, six.text_type): pqi.pqualid = _txt2obj( backend, x509.OID_CPS_QUALIFIER.dotted_string ) pqi.d.cpsuri = _encode_asn1_str( backend, qualifier.encode("ascii"), ) else: assert isinstance(qualifier, x509.UserNotice) pqi.pqualid = _txt2obj( backend, x509.OID_CPS_USER_NOTICE.dotted_string ) un = backend._lib.USERNOTICE_new() backend.openssl_assert(un != backend._ffi.NULL) pqi.d.usernotice = un if qualifier.explicit_text: un.exptext = _encode_asn1_utf8_str( backend, qualifier.explicit_text ) un.noticeref = _encode_notice_reference( backend, qualifier.notice_reference ) pi.qualifiers = pqis return cp def _encode_notice_reference(backend, notice): if notice is None: return backend._ffi.NULL else: nr = backend._lib.NOTICEREF_new() backend.openssl_assert(nr != backend._ffi.NULL) # organization is a required field nr.organization = _encode_asn1_utf8_str(backend, notice.organization) notice_stack = backend._lib.sk_ASN1_INTEGER_new_null() nr.noticenos = notice_stack for number in notice.notice_numbers: num = _encode_asn1_int(backend, number) res = backend._lib.sk_ASN1_INTEGER_push(notice_stack, num) backend.openssl_assert(res >= 1) return nr def _txt2obj(backend, name): """ Converts a Python string with an ASN.1 object ID in dotted form to a ASN1_OBJECT. """ name = name.encode("ascii") obj = backend._lib.OBJ_txt2obj(name, 1) backend.openssl_assert(obj != backend._ffi.NULL) return obj def _txt2obj_gc(backend, name): obj = _txt2obj(backend, name) obj = backend._ffi.gc(obj, backend._lib.ASN1_OBJECT_free) return obj def _encode_ocsp_nocheck(backend, ext): # Doesn't need to be GC'd return backend._lib.ASN1_NULL_new() def _encode_key_usage(backend, key_usage): set_bit = backend._lib.ASN1_BIT_STRING_set_bit ku = backend._lib.ASN1_BIT_STRING_new() ku = backend._ffi.gc(ku, backend._lib.ASN1_BIT_STRING_free) res = set_bit(ku, 0, key_usage.digital_signature) backend.openssl_assert(res == 1) res = set_bit(ku, 1, key_usage.content_commitment) backend.openssl_assert(res == 1) res = set_bit(ku, 2, key_usage.key_encipherment) backend.openssl_assert(res == 1) res = set_bit(ku, 3, key_usage.data_encipherment) backend.openssl_assert(res == 1) res = set_bit(ku, 4, key_usage.key_agreement) backend.openssl_assert(res == 1) res = set_bit(ku, 5, key_usage.key_cert_sign) backend.openssl_assert(res == 1) res = set_bit(ku, 6, key_usage.crl_sign) backend.openssl_assert(res == 1) if key_usage.key_agreement: res = set_bit(ku, 7, key_usage.encipher_only) backend.openssl_assert(res == 1) res = set_bit(ku, 8, key_usage.decipher_only) backend.openssl_assert(res == 1) else: res = set_bit(ku, 7, 0) backend.openssl_assert(res == 1) res = set_bit(ku, 8, 0) backend.openssl_assert(res == 1) return ku def _encode_authority_key_identifier(backend, authority_keyid): akid = backend._lib.AUTHORITY_KEYID_new() backend.openssl_assert(akid != backend._ffi.NULL) akid = backend._ffi.gc(akid, backend._lib.AUTHORITY_KEYID_free) if authority_keyid.key_identifier is not None: akid.keyid = _encode_asn1_str( backend, authority_keyid.key_identifier, ) if authority_keyid.authority_cert_issuer is not None: akid.issuer = _encode_general_names( backend, authority_keyid.authority_cert_issuer ) if authority_keyid.authority_cert_serial_number is not None: akid.serial = _encode_asn1_int( backend, authority_keyid.authority_cert_serial_number ) return akid def _encode_basic_constraints(backend, basic_constraints): constraints = backend._lib.BASIC_CONSTRAINTS_new() constraints = backend._ffi.gc( constraints, backend._lib.BASIC_CONSTRAINTS_free ) constraints.ca = 255 if basic_constraints.ca else 0 if basic_constraints.ca and basic_constraints.path_length is not None: constraints.pathlen = _encode_asn1_int( backend, basic_constraints.path_length ) return constraints def _encode_information_access(backend, info_access): aia = backend._lib.sk_ACCESS_DESCRIPTION_new_null() backend.openssl_assert(aia != backend._ffi.NULL) aia = backend._ffi.gc( aia, lambda x: backend._lib.sk_ACCESS_DESCRIPTION_pop_free( x, backend._ffi.addressof( backend._lib._original_lib, "ACCESS_DESCRIPTION_free" ), ), ) for access_description in info_access: ad = backend._lib.ACCESS_DESCRIPTION_new() method = _txt2obj( backend, access_description.access_method.dotted_string ) _encode_general_name_preallocated( backend, access_description.access_location, ad.location ) ad.method = method res = backend._lib.sk_ACCESS_DESCRIPTION_push(aia, ad) backend.openssl_assert(res >= 1) return aia def _encode_general_names(backend, names): general_names = backend._lib.GENERAL_NAMES_new() backend.openssl_assert(general_names != backend._ffi.NULL) for name in names: gn = _encode_general_name(backend, name) res = backend._lib.sk_GENERAL_NAME_push(general_names, gn) backend.openssl_assert(res != 0) return general_names def _encode_alt_name(backend, san): general_names = _encode_general_names(backend, san) general_names = backend._ffi.gc( general_names, backend._lib.GENERAL_NAMES_free ) return general_names def _encode_subject_key_identifier(backend, ski): return _encode_asn1_str_gc(backend, ski.digest) def _encode_general_name(backend, name): gn = backend._lib.GENERAL_NAME_new() _encode_general_name_preallocated(backend, name, gn) return gn def _encode_general_name_preallocated(backend, name, gn): if isinstance(name, x509.DNSName): backend.openssl_assert(gn != backend._ffi.NULL) gn.type = backend._lib.GEN_DNS ia5 = backend._lib.ASN1_IA5STRING_new() backend.openssl_assert(ia5 != backend._ffi.NULL) # ia5strings are supposed to be ITU T.50 but to allow round-tripping # of broken certs that encode utf8 we'll encode utf8 here too. value = name.value.encode("utf8") res = backend._lib.ASN1_STRING_set(ia5, value, len(value)) backend.openssl_assert(res == 1) gn.d.dNSName = ia5 elif isinstance(name, x509.RegisteredID): backend.openssl_assert(gn != backend._ffi.NULL) gn.type = backend._lib.GEN_RID obj = backend._lib.OBJ_txt2obj( name.value.dotted_string.encode("ascii"), 1 ) backend.openssl_assert(obj != backend._ffi.NULL) gn.d.registeredID = obj elif isinstance(name, x509.DirectoryName): backend.openssl_assert(gn != backend._ffi.NULL) dir_name = _encode_name(backend, name.value) gn.type = backend._lib.GEN_DIRNAME gn.d.directoryName = dir_name elif isinstance(name, x509.IPAddress): backend.openssl_assert(gn != backend._ffi.NULL) if isinstance(name.value, ipaddress.IPv4Network): packed = name.value.network_address.packed + utils.int_to_bytes( ((1 << 32) - name.value.num_addresses), 4 ) elif isinstance(name.value, ipaddress.IPv6Network): packed = name.value.network_address.packed + utils.int_to_bytes( (1 << 128) - name.value.num_addresses, 16 ) else: packed = name.value.packed ipaddr = _encode_asn1_str(backend, packed) gn.type = backend._lib.GEN_IPADD gn.d.iPAddress = ipaddr elif isinstance(name, x509.OtherName): backend.openssl_assert(gn != backend._ffi.NULL) other_name = backend._lib.OTHERNAME_new() backend.openssl_assert(other_name != backend._ffi.NULL) type_id = backend._lib.OBJ_txt2obj( name.type_id.dotted_string.encode("ascii"), 1 ) backend.openssl_assert(type_id != backend._ffi.NULL) data = backend._ffi.new("unsigned char[]", name.value) data_ptr_ptr = backend._ffi.new("unsigned char **") data_ptr_ptr[0] = data value = backend._lib.d2i_ASN1_TYPE( backend._ffi.NULL, data_ptr_ptr, len(name.value) ) if value == backend._ffi.NULL: backend._consume_errors() raise ValueError("Invalid ASN.1 data") other_name.type_id = type_id other_name.value = value gn.type = backend._lib.GEN_OTHERNAME gn.d.otherName = other_name elif isinstance(name, x509.RFC822Name): backend.openssl_assert(gn != backend._ffi.NULL) # ia5strings are supposed to be ITU T.50 but to allow round-tripping # of broken certs that encode utf8 we'll encode utf8 here too. data = name.value.encode("utf8") asn1_str = _encode_asn1_str(backend, data) gn.type = backend._lib.GEN_EMAIL gn.d.rfc822Name = asn1_str elif isinstance(name, x509.UniformResourceIdentifier): backend.openssl_assert(gn != backend._ffi.NULL) # ia5strings are supposed to be ITU T.50 but to allow round-tripping # of broken certs that encode utf8 we'll encode utf8 here too. data = name.value.encode("utf8") asn1_str = _encode_asn1_str(backend, data) gn.type = backend._lib.GEN_URI gn.d.uniformResourceIdentifier = asn1_str else: raise ValueError("{} is an unknown GeneralName type".format(name)) def _encode_extended_key_usage(backend, extended_key_usage): eku = backend._lib.sk_ASN1_OBJECT_new_null() eku = backend._ffi.gc(eku, backend._lib.sk_ASN1_OBJECT_free) for oid in extended_key_usage: obj = _txt2obj(backend, oid.dotted_string) res = backend._lib.sk_ASN1_OBJECT_push(eku, obj) backend.openssl_assert(res >= 1) return eku _CRLREASONFLAGS = { x509.ReasonFlags.key_compromise: 1, x509.ReasonFlags.ca_compromise: 2, x509.ReasonFlags.affiliation_changed: 3, x509.ReasonFlags.superseded: 4, x509.ReasonFlags.cessation_of_operation: 5, x509.ReasonFlags.certificate_hold: 6, x509.ReasonFlags.privilege_withdrawn: 7, x509.ReasonFlags.aa_compromise: 8, } def _encode_reasonflags(backend, reasons): bitmask = backend._lib.ASN1_BIT_STRING_new() backend.openssl_assert(bitmask != backend._ffi.NULL) for reason in reasons: res = backend._lib.ASN1_BIT_STRING_set_bit( bitmask, _CRLREASONFLAGS[reason], 1 ) backend.openssl_assert(res == 1) return bitmask def _encode_full_name(backend, full_name): dpn = backend._lib.DIST_POINT_NAME_new() backend.openssl_assert(dpn != backend._ffi.NULL) dpn.type = _DISTPOINT_TYPE_FULLNAME dpn.name.fullname = _encode_general_names(backend, full_name) return dpn def _encode_relative_name(backend, relative_name): dpn = backend._lib.DIST_POINT_NAME_new() backend.openssl_assert(dpn != backend._ffi.NULL) dpn.type = _DISTPOINT_TYPE_RELATIVENAME dpn.name.relativename = _encode_sk_name_entry(backend, relative_name) return dpn def _encode_cdps_freshest_crl(backend, cdps): cdp = backend._lib.sk_DIST_POINT_new_null() cdp = backend._ffi.gc(cdp, backend._lib.sk_DIST_POINT_free) for point in cdps: dp = backend._lib.DIST_POINT_new() backend.openssl_assert(dp != backend._ffi.NULL) if point.reasons: dp.reasons = _encode_reasonflags(backend, point.reasons) if point.full_name: dp.distpoint = _encode_full_name(backend, point.full_name) if point.relative_name: dp.distpoint = _encode_relative_name(backend, point.relative_name) if point.crl_issuer: dp.CRLissuer = _encode_general_names(backend, point.crl_issuer) res = backend._lib.sk_DIST_POINT_push(cdp, dp) backend.openssl_assert(res >= 1) return cdp def _encode_name_constraints(backend, name_constraints): nc = backend._lib.NAME_CONSTRAINTS_new() backend.openssl_assert(nc != backend._ffi.NULL) nc = backend._ffi.gc(nc, backend._lib.NAME_CONSTRAINTS_free) permitted = _encode_general_subtree( backend, name_constraints.permitted_subtrees ) nc.permittedSubtrees = permitted excluded = _encode_general_subtree( backend, name_constraints.excluded_subtrees ) nc.excludedSubtrees = excluded return nc def _encode_policy_constraints(backend, policy_constraints): pc = backend._lib.POLICY_CONSTRAINTS_new() backend.openssl_assert(pc != backend._ffi.NULL) pc = backend._ffi.gc(pc, backend._lib.POLICY_CONSTRAINTS_free) if policy_constraints.require_explicit_policy is not None: pc.requireExplicitPolicy = _encode_asn1_int( backend, policy_constraints.require_explicit_policy ) if policy_constraints.inhibit_policy_mapping is not None: pc.inhibitPolicyMapping = _encode_asn1_int( backend, policy_constraints.inhibit_policy_mapping ) return pc def _encode_general_subtree(backend, subtrees): if subtrees is None: return backend._ffi.NULL else: general_subtrees = backend._lib.sk_GENERAL_SUBTREE_new_null() for name in subtrees: gs = backend._lib.GENERAL_SUBTREE_new() gs.base = _encode_general_name(backend, name) res = backend._lib.sk_GENERAL_SUBTREE_push(general_subtrees, gs) backend.openssl_assert(res >= 1) return general_subtrees def _encode_precert_signed_certificate_timestamps(backend, scts): sct_stack = backend._lib.sk_SCT_new_null() backend.openssl_assert(sct_stack != backend._ffi.NULL) sct_stack = backend._ffi.gc(sct_stack, backend._lib.sk_SCT_free) for sct in scts: res = backend._lib.sk_SCT_push(sct_stack, sct._sct) backend.openssl_assert(res >= 1) return sct_stack def _encode_nonce(backend, nonce): return _encode_asn1_str_gc(backend, nonce.nonce) _EXTENSION_ENCODE_HANDLERS = { ExtensionOID.BASIC_CONSTRAINTS: _encode_basic_constraints, ExtensionOID.SUBJECT_KEY_IDENTIFIER: _encode_subject_key_identifier, ExtensionOID.KEY_USAGE: _encode_key_usage, ExtensionOID.SUBJECT_ALTERNATIVE_NAME: _encode_alt_name, ExtensionOID.ISSUER_ALTERNATIVE_NAME: _encode_alt_name, ExtensionOID.EXTENDED_KEY_USAGE: _encode_extended_key_usage, ExtensionOID.AUTHORITY_KEY_IDENTIFIER: _encode_authority_key_identifier, ExtensionOID.CERTIFICATE_POLICIES: _encode_certificate_policies, ExtensionOID.AUTHORITY_INFORMATION_ACCESS: _encode_information_access, ExtensionOID.SUBJECT_INFORMATION_ACCESS: _encode_information_access, ExtensionOID.CRL_DISTRIBUTION_POINTS: _encode_cdps_freshest_crl, ExtensionOID.FRESHEST_CRL: _encode_cdps_freshest_crl, ExtensionOID.INHIBIT_ANY_POLICY: _encode_inhibit_any_policy, ExtensionOID.OCSP_NO_CHECK: _encode_ocsp_nocheck, ExtensionOID.NAME_CONSTRAINTS: _encode_name_constraints, ExtensionOID.POLICY_CONSTRAINTS: _encode_policy_constraints, ExtensionOID.PRECERT_SIGNED_CERTIFICATE_TIMESTAMPS: ( _encode_precert_signed_certificate_timestamps ), } _CRL_EXTENSION_ENCODE_HANDLERS = { ExtensionOID.ISSUER_ALTERNATIVE_NAME: _encode_alt_name, ExtensionOID.AUTHORITY_KEY_IDENTIFIER: _encode_authority_key_identifier, ExtensionOID.AUTHORITY_INFORMATION_ACCESS: _encode_information_access, ExtensionOID.CRL_NUMBER: _encode_crl_number_delta_crl_indicator, ExtensionOID.DELTA_CRL_INDICATOR: _encode_crl_number_delta_crl_indicator, ExtensionOID.ISSUING_DISTRIBUTION_POINT: _encode_issuing_dist_point, ExtensionOID.FRESHEST_CRL: _encode_cdps_freshest_crl, } _CRL_ENTRY_EXTENSION_ENCODE_HANDLERS = { CRLEntryExtensionOID.CERTIFICATE_ISSUER: _encode_alt_name, CRLEntryExtensionOID.CRL_REASON: _encode_crl_reason, CRLEntryExtensionOID.INVALIDITY_DATE: _encode_invalidity_date, } _OCSP_REQUEST_EXTENSION_ENCODE_HANDLERS = { OCSPExtensionOID.NONCE: _encode_nonce, } _OCSP_BASICRESP_EXTENSION_ENCODE_HANDLERS = { OCSPExtensionOID.NONCE: _encode_nonce, }
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