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author | Paul Kehrer <paul.l.kehrer@gmail.com> | 2015-08-01 20:04:42 +0100 |
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committer | Paul Kehrer <paul.l.kehrer@gmail.com> | 2015-08-01 20:04:42 +0100 |
commit | e88c4318eabcc2c252a184df9a672161078fe911 (patch) | |
tree | ba228fc86efcbe8987a5cf34f687377d6b55dbcc | |
parent | 172d6846d78e34c005d2c679cf53dd79a3e54d8e (diff) | |
download | cryptography-e88c4318eabcc2c252a184df9a672161078fe911.tar.gz cryptography-e88c4318eabcc2c252a184df9a672161078fe911.tar.bz2 cryptography-e88c4318eabcc2c252a184df9a672161078fe911.zip |
simplify x509 extension decoding
-rw-r--r-- | src/cryptography/hazmat/backends/openssl/x509.py | 101 |
1 files changed, 28 insertions, 73 deletions
diff --git a/src/cryptography/hazmat/backends/openssl/x509.py b/src/cryptography/hazmat/backends/openssl/x509.py index 493abc83..63e4a177 100644 --- a/src/cryptography/hazmat/backends/openssl/x509.py +++ b/src/cryptography/hazmat/backends/openssl/x509.py @@ -234,7 +234,9 @@ class _X509ExtensionParser(object): "{0} is not currently supported".format(oid), oid ) else: - value = handler(backend, ext) + d2i = backend._lib.X509V3_EXT_d2i(ext) + assert d2i != backend._ffi.NULL + value = handler(backend, d2i) extensions.append(x509.Extension(oid, critical, value)) seen_oids.add(oid) @@ -358,12 +360,8 @@ class _Certificate(object): return self._backend._read_mem_bio(bio) -def _decode_certificate_policies(backend, ext): - cp = backend._ffi.cast( - "Cryptography_STACK_OF_POLICYINFO *", - backend._lib.X509V3_EXT_d2i(ext) - ) - assert cp != backend._ffi.NULL +def _decode_certificate_policies(backend, cp): + cp = backend._ffi.cast("Cryptography_STACK_OF_POLICYINFO *", cp) cp = backend._ffi.gc(cp, backend._lib.sk_POLICYINFO_free) num = backend._lib.sk_POLICYINFO_num(cp) certificate_policies = [] @@ -431,12 +429,8 @@ def _decode_user_notice(backend, un): return x509.UserNotice(notice_reference, explicit_text) -def _decode_basic_constraints(backend, ext): - bc_st = backend._lib.X509V3_EXT_d2i(ext) - assert bc_st != backend._ffi.NULL - basic_constraints = backend._ffi.cast( - "BASIC_CONSTRAINTS *", bc_st - ) +def _decode_basic_constraints(backend, bc_st): + basic_constraints = backend._ffi.cast("BASIC_CONSTRAINTS *", bc_st) basic_constraints = backend._ffi.gc( basic_constraints, backend._lib.BASIC_CONSTRAINTS_free ) @@ -447,19 +441,13 @@ def _decode_basic_constraints(backend, ext): if basic_constraints.pathlen == backend._ffi.NULL: path_length = None else: - path_length = _asn1_integer_to_int( - backend, basic_constraints.pathlen - ) + path_length = _asn1_integer_to_int(backend, basic_constraints.pathlen) return x509.BasicConstraints(ca, path_length) -def _decode_subject_key_identifier(backend, ext): - asn1_string = backend._lib.X509V3_EXT_d2i(ext) - assert asn1_string != backend._ffi.NULL - asn1_string = backend._ffi.cast( - "ASN1_OCTET_STRING *", asn1_string - ) +def _decode_subject_key_identifier(backend, asn1_string): + asn1_string = backend._ffi.cast("ASN1_OCTET_STRING *", asn1_string) asn1_string = backend._ffi.gc( asn1_string, backend._lib.ASN1_OCTET_STRING_free ) @@ -468,13 +456,9 @@ def _decode_subject_key_identifier(backend, ext): ) -def _decode_authority_key_identifier(backend, ext): - akid = backend._lib.X509V3_EXT_d2i(ext) - assert akid != backend._ffi.NULL +def _decode_authority_key_identifier(backend, akid): akid = backend._ffi.cast("AUTHORITY_KEYID *", akid) - akid = backend._ffi.gc( - akid, backend._lib.AUTHORITY_KEYID_free - ) + akid = backend._ffi.gc(akid, backend._lib.AUTHORITY_KEYID_free) key_identifier = None authority_cert_issuer = None authority_cert_serial_number = None @@ -499,15 +483,9 @@ def _decode_authority_key_identifier(backend, ext): ) -def _decode_authority_information_access(backend, ext): - aia = backend._lib.X509V3_EXT_d2i(ext) - assert aia != backend._ffi.NULL - aia = backend._ffi.cast( - "Cryptography_STACK_OF_ACCESS_DESCRIPTION *", aia - ) - aia = backend._ffi.gc( - aia, backend._lib.sk_ACCESS_DESCRIPTION_free - ) +def _decode_authority_information_access(backend, aia): + aia = backend._ffi.cast("Cryptography_STACK_OF_ACCESS_DESCRIPTION *", aia) + aia = backend._ffi.gc(aia, backend._lib.sk_ACCESS_DESCRIPTION_free) num = backend._lib.sk_ACCESS_DESCRIPTION_num(aia) access_descriptions = [] for i in range(num): @@ -521,13 +499,9 @@ def _decode_authority_information_access(backend, ext): return x509.AuthorityInformationAccess(access_descriptions) -def _decode_key_usage(backend, ext): - bit_string = backend._lib.X509V3_EXT_d2i(ext) - assert bit_string != backend._ffi.NULL +def _decode_key_usage(backend, bit_string): bit_string = backend._ffi.cast("ASN1_BIT_STRING *", bit_string) - bit_string = backend._ffi.gc( - bit_string, backend._lib.ASN1_BIT_STRING_free - ) + bit_string = backend._ffi.gc(bit_string, backend._lib.ASN1_BIT_STRING_free) get_bit = backend._lib.ASN1_BIT_STRING_get_bit digital_signature = get_bit(bit_string, 0) == 1 content_commitment = get_bit(bit_string, 1) == 1 @@ -551,11 +525,8 @@ def _decode_key_usage(backend, ext): ) -def _decode_general_names_extension(backend, ext): - gns = backend._ffi.cast( - "GENERAL_NAMES *", backend._lib.X509V3_EXT_d2i(ext) - ) - assert gns != backend._ffi.NULL +def _decode_general_names_extension(backend, gns): + gns = backend._ffi.cast("GENERAL_NAMES *", gns) gns = backend._ffi.gc(gns, backend._lib.GENERAL_NAMES_free) general_names = _decode_general_names(backend, gns) return general_names @@ -573,11 +544,8 @@ def _decode_issuer_alt_name(backend, ext): ) -def _decode_name_constraints(backend, ext): - nc = backend._ffi.cast( - "NAME_CONSTRAINTS *", backend._lib.X509V3_EXT_d2i(ext) - ) - assert nc != backend._ffi.NULL +def _decode_name_constraints(backend, nc): + nc = backend._ffi.cast("NAME_CONSTRAINTS *", nc) nc = backend._ffi.gc(nc, backend._lib.NAME_CONSTRAINTS_free) permitted = _decode_general_subtrees(backend, nc.permittedSubtrees) excluded = _decode_general_subtrees(backend, nc.excludedSubtrees) @@ -602,12 +570,8 @@ def _decode_general_subtrees(backend, stack_subtrees): return subtrees -def _decode_extended_key_usage(backend, ext): - sk = backend._ffi.cast( - "Cryptography_STACK_OF_ASN1_OBJECT *", - backend._lib.X509V3_EXT_d2i(ext) - ) - assert sk != backend._ffi.NULL +def _decode_extended_key_usage(backend, sk): + sk = backend._ffi.cast("Cryptography_STACK_OF_ASN1_OBJECT *", sk) sk = backend._ffi.gc(sk, backend._lib.sk_ASN1_OBJECT_free) num = backend._lib.sk_ASN1_OBJECT_num(sk) ekus = [] @@ -621,14 +585,9 @@ def _decode_extended_key_usage(backend, ext): return x509.ExtendedKeyUsage(ekus) -def _decode_crl_distribution_points(backend, ext): - cdps = backend._ffi.cast( - "Cryptography_STACK_OF_DIST_POINT *", - backend._lib.X509V3_EXT_d2i(ext) - ) - assert cdps != backend._ffi.NULL - cdps = backend._ffi.gc( - cdps, backend._lib.sk_DIST_POINT_free) +def _decode_crl_distribution_points(backend, cdps): + cdps = backend._ffi.cast("Cryptography_STACK_OF_DIST_POINT *", cdps) + cdps = backend._ffi.gc(cdps, backend._lib.sk_DIST_POINT_free) num = backend._lib.sk_DIST_POINT_num(cdps) dist_points = [] @@ -716,12 +675,8 @@ def _decode_crl_distribution_points(backend, ext): return x509.CRLDistributionPoints(dist_points) -def _decode_inhibit_any_policy(backend, ext): - asn1_int = backend._ffi.cast( - "ASN1_INTEGER *", - backend._lib.X509V3_EXT_d2i(ext) - ) - assert asn1_int != backend._ffi.NULL +def _decode_inhibit_any_policy(backend, asn1_int): + asn1_int = backend._ffi.cast("ASN1_INTEGER *", asn1_int) asn1_int = backend._ffi.gc(asn1_int, backend._lib.ASN1_INTEGER_free) skip_certs = _asn1_integer_to_int(backend, asn1_int) return x509.InhibitAnyPolicy(skip_certs) |