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""" __author__ = "P J Kershaw (STFC)" __date__ = "09/12/11" __copyright__ = "(C) 2012 Science and Technology Facilities Council" __license__ = "BSD - see LICENSE file in top-level directory" __contact__ = "Philip.Kershaw@stfc.ac.uk" __revision__ = '$Id$' import re import logging log = logging.getLogger(__name__) try: from ndg.httpsclient.subj_alt_name import SubjectAltName from pyasn1.codec.der import decoder as der_decoder SUBJ_ALT_NAME_SUPPORT = True except ImportError as e: SUBJ_ALT_NAME_SUPPORT = False SUBJ_ALT_NAME_SUPPORT_MSG = ( 'SubjectAltName support is disabled - check pyasn1 package ' 'installation to enable' ) import warnings warnings.warn(SUBJ_ALT_NAME_SUPPORT_MSG) class ServerSSLCertVerification(object): """Check server identity. If hostname doesn't match, allow match of host's Distinguished Name against server DN setting""" DN_LUT = { 'commonName': 'CN', 'organisationalUnitName': 'OU', 'organisation': 'O', 'countryName': 'C', 'emailAddress': 'EMAILADDRESS', 'localityName': 'L', 'stateOrProvinceName': 'ST', 'streetAddress': 'STREET', 'domainComponent': 'DC', 'userid': 'UID' } SUBJ_ALT_NAME_EXT_NAME = 'subjectAltName' PARSER_RE_STR = '/(%s)=' % '|'.join(list(DN_LUT.keys()) + \ list(DN_LUT.values())) PARSER_RE = re.compile(PARSER_RE_STR) __slots__ = ('__hostname', '__certDN', '__subj_alt_name_match') def __init__(self, certDN=None, hostname=None, subj_alt_name_match=True): """Override parent class __init__ to enable setting of certDN setting @type certDN: string @param certDN: Set the expected Distinguished Name of the server to avoid errors matching hostnames. This is useful where the hostname is not fully qualified @type hostname: string @param hostname: hostname to match against peer certificate subjectAltNames or subject common name @type subj_alt_name_match: bool @param subj_alt_name_match: flag to enable/disable matching of hostname against peer certificate subjectAltNames. Nb. A setting of True will be ignored if the pyasn1 package is not installed """ self.__certDN = None self.__hostname = None if certDN is not None: self.certDN = certDN if hostname is not None: self.hostname = hostname if subj_alt_name_match: if not SUBJ_ALT_NAME_SUPPORT: log.warning('Overriding "subj_alt_name_match" keyword setting: ' 'peer verification with subjectAltNames is disabled') self.__subj_alt_name_match = False else: self.__subj_alt_name_match = True else: log.debug('Disabling peer verification with subject ' 'subjectAltNames!') self.__subj_alt_name_match = False def __call__(self, connection, peerCert, errorStatus, errorDepth, preverifyOK): """Verify server certificate @type connection: OpenSSL.SSL.Connection @param connection: SSL connection object @type peerCert: basestring @param peerCert: server host certificate as OpenSSL.crypto.X509 instance @type errorStatus: int @param errorStatus: error status passed from caller. This is the value returned by the OpenSSL C function X509_STORE_CTX_get_error(). Look-up x509_vfy.h in the OpenSSL source to get the meanings of the different codes. PyOpenSSL doesn't help you! @type errorDepth: int @param errorDepth: a non-negative integer representing where in the certificate chain the error occurred. If it is zero it occured in the end entity certificate, one if it is the certificate which signed the end entity certificate and so on. @type preverifyOK: int @param preverifyOK: the error status - 0 = Error, 1 = OK of the current SSL context irrespective of any verification checks done here. If this function yields an OK status, it should enforce the preverifyOK value so that any error set upstream overrides and is honoured. @rtype: int @return: status code - 0/False = Error, 1/True = OK """ if peerCert.has_expired(): # Any expired certificate in the chain should result in an error log.error('Certificate %r in peer certificate chain has expired', peerCert.get_subject()) return False elif errorDepth == 0: # Only interested in DN of last certificate in the chain - this must # match the expected Server DN setting peerCertSubj = peerCert.get_subject() peerCertDN = peerCertSubj.get_components() peerCertDN.sort() if self.certDN is None: # Check hostname against peer certificate CN field instead: if self.hostname is None: log.error('No "hostname" or "certDN" set to check peer ' 'certificate against') return False # Check for subject alternative names if self.__subj_alt_name_match: dns_names = self._get_subj_alt_name(peerCert) if self.hostname in dns_names: return preverifyOK # If no subjectAltNames, default to check of subject Common Name if peerCertSubj.commonName == self.hostname: return preverifyOK else: log.error('Peer certificate CN %r doesn\'t match the ' 'expected CN %r', peerCertSubj.commonName, self.hostname) return False else: if peerCertDN == self.certDN: return preverifyOK else: log.error('Peer certificate DN %r doesn\'t match the ' 'expected DN %r', peerCertDN, self.certDN) return False else: return preverifyOK def get_verify_server_cert_func(self): def verify_server_cert(connection, peerCert, errorStatus, errorDepth, preverifyOK): return self.__call__(connection, peerCert, errorStatus, errorDepth, preverifyOK) return verify_server_cert @classmethod def _get_subj_alt_name(cls, peer_cert): '''Extract subjectAltName DNS name settings from certificate extensions @param peer_cert: peer certificate in SSL connection. subjectAltName settings if any will be extracted from this @type peer_cert: OpenSSL.crypto.X509 ''' # Search through extensions dns_name = [] general_names = SubjectAltName() for i in range(peer_cert.get_extension_count()): ext = peer_cert.get_extension(i) ext_name = ext.get_short_name() if ext_name == cls.SUBJ_ALT_NAME_EXT_NAME: # PyOpenSSL returns extension data in ASN.1 encoded form ext_dat = ext.get_data() decoded_dat = der_decoder.decode(ext_dat, asn1Spec=general_names) for name in decoded_dat: if isinstance(name, SubjectAltName): for entry in range(len(name)): component = name.getComponentByPosition(entry) dns_name.append(str(component.getComponent())) return dns_name def _getCertDN(self): return self.__certDN def _setCertDN(self, val): if isinstance(val, str): # Allow for quoted DN certDN = val.strip('"') dnFields = self.__class__.PARSER_RE.split(certDN) if len(dnFields) < 2: raise TypeError('Error parsing DN string: "%s"' % certDN) self.__certDN = list(zip(dnFields[1::2], dnFields[2::2])) self.__certDN.sort() elif not isinstance(val, list): for i in val: if not len(i) == 2: raise TypeError('Expecting list of two element DN field, ' 'DN field value pairs for "certDN" ' 'attribute') self.__certDN = val else: raise TypeError('Expecting list or string type for "certDN" ' 'attribute') certDN = property(fget=_getCertDN, fset=_setCertDN, doc="Distinguished Name for Server Certificate") # Get/Set Property methods def _getHostname(self): return self.__hostname def _setHostname(self, val): if not isinstance(val, str): raise TypeError("Expecting string type for hostname " "attribute") self.__hostname = val hostname = property(fget=_getHostname, fset=_setHostname, doc="hostname of server")