-from ctypes import c_void_p,create_string_buffer,c_long,c_int,POINTER,c_char_p
+"""
+Implements interface to openssl X509 and X509Store structures,
+I.e allows to load, analyze and verify certificates.
+
+X509Store objects are also used to verify other signed documets,
+such as CMS, OCSP and timestamps.
+"""
+
+
+
+from ctypes import c_void_p,create_string_buffer,c_long,c_int,POINTER,c_char_p,Structure,cast
from ctypescrypto.bio import Membio
from ctypescrypto.pkey import PKey
from ctypescrypto.oid import Oid
from ctypescrypto.exception import LibCryptoError
from ctypescrypto import libcrypto
+from datetime import datetime
+try:
+ from pytz import utc
+except ImportError:
+ from datetime import timedelta
+ ZERO=timedelta(0)
+ class UTC(datetime.tzinfo):
+ """tzinfo object for UTC.
+ If no pytz is available, we would use it.
+ """
+
+ def utcoffset(self, dt):
+ return ZERO
+
+ def tzname(self, dt):
+ return "UTC"
+
+ def dst(self, dt):
+ return ZERO
+
+ utc=UTC()
+
+__all__ = ['X509Error','X509Name','X509Store','StackOfX509']
+
+class _validity(Structure):
+ """ ctypes representation of X509_VAL structure
+ needed to access certificate validity period, because openssl
+ doesn't provide fuctions for it - only macros
+ """
+ _fields_ = [('notBefore',c_void_p),('notAfter',c_void_p)]
+
+class _cinf(Structure):
+ """ ctypes representtion of X509_CINF structure
+ neede to access certificate data, which are accessable only
+ via macros
+ """
+ _fields_ = [('version',c_void_p),
+ ('serialNumber',c_void_p),
+ ('sign_alg',c_void_p),
+ ('issuer',c_void_p),
+ ('validity',POINTER(_validity)),
+ ('subject',c_void_p),
+ ('pubkey',c_void_p),
+ ]
+
+class _x509(Structure):
+ """
+ ctypes represntation of X509 structure needed
+ to access certificate data which are accesable only via
+ macros, not functions
+ """
+ _fields_ = [('cert_info',POINTER(_cinf)),
+ ('sig_alg',c_void_p),
+ ('signature',c_void_p),
+ # There are a lot of parsed extension fields there
+ ]
+_px509 = POINTER(_x509)
+
+# X509_extlist is not exported yet, because is not implemented
class X509Error(LibCryptoError):
"""
Exception, generated when some openssl function fail
"""
Class which represents X.509 distinguished name - typically
a certificate subject name or an issuer name.
+
+ Now used only to represent information, extracted from the
+ certificate. Potentially can be also used to build DN when creating
+ certificate signing request
"""
# XN_FLAG_SEP_COMMA_PLUS & ASN1_STRFLG_UTF8_CONVERT
PRINT_FLAG=0x10010
@param chain - list of X509 objects to add into verification
context.These objects are untrusted, but can be used to
build certificate chain up to trusted object in the store
- @param key - PKey object
- parameters stora and key are mutually exclusive. If neither is specified, attempts to verify
+ @param key - PKey object with open key to validate signature
- itself as self-signed certificate
+ parameters store and key are mutually exclusive. If neither
+ is specified, attempts to verify self as self-signed certificate
"""
if store is not None and key is not None:
raise X509Error("key and store cannot be specified simultaneously")
b=Membio()
libcrypto.i2a_ASN1_INTEGER(b.bio,asnint)
return int(str(b),16)
+ @property
+ def version(self):
+ """ certificate version as integer. Really certificate stores 0 for
+ version 1 and 2 for version 3, but we return 1 and 3 """
+ asn1int=cast(self.cert,_px509)[0].cert_info[0].version
+ return libcrypto.ASN1_INTEGER_get(asn1int)+1
@property
def startDate(self):
""" Certificate validity period start date """
# Need deep poke into certificate structure (x)->cert_info->validity->notBefore
- raise NotImplementedError
+ global utc
+ asn1date=cast(self.cert,_px509)[0].cert_info[0].validity[0].notBefore
+ b=Membio()
+ libcrypto.ASN1_TIME_print(b.bio,asn1date)
+ return datetime.strptime(str(b),"%b %d %H:%M:%S %Y %Z").replace(tzinfo=utc)
@property
def endDate(self):
""" Certificate validity period end date """
# Need deep poke into certificate structure (x)->cert_info->validity->notAfter
- raise NotImplementedError
+ global utc
+ asn1date=cast(self.cert,_px509)[0].cert_info[0].validity[0].notAfter
+ b=Membio()
+ libcrypto.ASN1_TIME_print(b.bio,asn1date)
+ return datetime.strptime(str(b),"%b %d %H:%M:%S %Y %Z").replace(tzinfo=utc)
def extensions(self):
""" Returns list of extensions """
raise NotImplementedError
return libcrypto.X509_check_ca(self.cert)>0
class X509Store:
"""
- Represents trusted certificate store. Can be used to lookup CA certificates to verify
+ Represents trusted certificate store. Can be used to lookup CA
+ certificates to verify
- @param file - file with several certificates and crls to load into store
+ @param file - file with several certificates and crls
+ to load into store
@param dir - hashed directory with certificates and crls
- @param default - if true, default verify location (directory) is installed
+ @param default - if true, default verify location (directory)
+ is installed
"""
def __init__(self,file=None,dir=None,default=False):
libcrypto.sk_push(self.ptr,libcrypto.X509_dup(value.cert))
libcrypto.i2a_ASN1_INTEGER.argtypes=(c_void_p,c_void_p)
libcrypto.ASN1_STRING_print_ex.argtypes=(c_void_p,c_void_p,c_long)
+libcrypto.ASN1_TIME_print.argtypes=(c_void_p,c_void_p)
+libcrypto.ASN1_INTEGER_get.argtypes=(c_void_p,)
+libcrypto.ASN1_INTEGER_get.restype=c_long
libcrypto.X509_get_serialNumber.argtypes=(c_void_p,)
libcrypto.X509_get_serialNumber.restype=c_void_p
libcrypto.X509_NAME_ENTRY_get_object.restype=c_void_p
libcrypto.X509_LOOKUP_hash_dir.restype=c_void_p
libcrypto.X509_LOOKUP_ctrl.restype=c_int
libcrypto.X509_LOOKUP_ctrl.argtypes=(c_void_p,c_int,c_char_p,c_long,POINTER(c_char_p))
+
projects / oss / ctypescrypto.git / blobdiff